/* * Asterisk -- A telephony toolkit for Linux. * * Implementation of Session Initiation Protocol * * Copyright (C) 1999, Mark Spencer * * Mark Spencer * * This program is free software, distributed under the terms of * the GNU General Public License */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* #define VOCAL_DATA_HACK */ #define SIPDUMPER #define DEFAULT_DEFAULT_EXPIRY 120 #define DEFAULT_MAX_EXPIRY 3600 #define SIP_DTMF_RFC2833 (1 << 0) #define SIP_DTMF_INBAND (1 << 1) #define SIP_DTMF_INFO (1 << 2) static int max_expiry = DEFAULT_MAX_EXPIRY; static int default_expiry = DEFAULT_DEFAULT_EXPIRY; #define DEFAULT_MAXMS 2000 /* Must be faster than 2 seconds by default */ #define DEFAULT_MAXMS 2000 /* Must be faster than 2 seconds by default */ #define DEFAULT_FREQ_OK 60 * 1000 /* How often to check for the host to be up */ #define DEFAULT_FREQ_NOTOK 10 * 1000 /* How often to check, if the host is down... */ #define DEFAULT_RETRANS 1000 /* How frequently to retransmit */ #define MAX_RETRANS 5 /* Try only 5 times for retransmissions */ static char *desc = "Session Initiation Protocol (SIP)"; static char *type = "sip"; static char *tdesc = "Session Initiation Protocol (SIP)"; static char *config = "sip.conf"; #define DEFAULT_SIP_PORT 5060 /* From RFC 2543 */ #define SIP_MAX_PACKET 1500 /* Also from RFC 2543, should sub headers tho */ static char context[AST_MAX_EXTENSION] = "default"; static char language[MAX_LANGUAGE] = ""; static char callerid[AST_MAX_EXTENSION] = "asterisk"; static char fromdomain[AST_MAX_EXTENSION] = ""; static int usecnt =0; static pthread_mutex_t usecnt_lock = AST_MUTEX_INITIALIZER; /* Protect the interface list (of sip_pvt's) */ static pthread_mutex_t iflock = AST_MUTEX_INITIALIZER; /* Protect the monitoring thread, so only one process can kill or start it, and not when it's doing something critical. */ static pthread_mutex_t netlock = AST_MUTEX_INITIALIZER; static pthread_mutex_t monlock = AST_MUTEX_INITIALIZER; /* This is the thread for the monitor which checks for input on the channels which are not currently in use. */ static pthread_t monitor_thread = 0; static int restart_monitor(void); /* Codecs that we support by default: */ static int capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM; static int noncodeccapability = AST_RTP_DTMF; static char ourhost[256]; static struct in_addr __ourip; static int ourport; static int sipdebug = 0; static int tos = 0; static int globaldtmfmode = SIP_DTMF_RFC2833; /* Expire slowly */ static int expiry = 900; static struct sched_context *sched; static struct io_context *io; /* The private structures of the sip channels are linked for selecting outgoing channels */ #define SIP_MAX_HEADERS 64 #define SIP_MAX_LINES 64 static struct sip_codec_pref { int codec; struct sip_codec_pref *next; } *prefs; struct sip_request { char *rlPart1; /* SIP Method Name or "SIP/2.0" protocol version */ char *rlPart2; /* The Request URI or Response Status */ int len; int headers; /* SIP Headers */ char *header[SIP_MAX_HEADERS]; int lines; /* SDP Content */ char *line[SIP_MAX_LINES]; char data[SIP_MAX_PACKET]; }; struct sip_pkt; struct sip_route { struct sip_route *next; char hop[0]; }; static struct sip_pvt { pthread_mutex_t lock; /* Channel private lock */ char callid[80]; /* Global CallID */ char randdata[80]; /* Random data */ unsigned int ocseq; /* Current outgoing seqno */ unsigned int icseq; /* Current incoming seqno */ unsigned int callgroup; unsigned int pickupgroup; int lastinvite; /* Last Cseq of invite */ int alreadygone; /* Whether or not we've already been destroyed by or peer */ int needdestroy; /* if we need to be destroyed */ int capability; /* Special capability */ int noncodeccapability; int outgoing; /* Outgoing or incoming call? */ int insecure; /* Don't check source port/ip */ int expiry; /* How long we take to expire */ int branch; /* One random number */ int canreinvite; /* Do we support reinvite */ int progress; /* Have sent 183 message progress */ int tag; /* Another random number */ int nat; /* Whether to try to support NAT */ struct sockaddr_in sa; /* Our peer */ struct sockaddr_in recv; /* Received as */ struct in_addr ourip; /* Our IP */ struct ast_channel *owner; /* Who owns us */ char exten[AST_MAX_EXTENSION]; /* Extention where to start */ char refer_to[AST_MAX_EXTENSION]; /* Place to store REFER-TO extension */ char referred_by[AST_MAX_EXTENSION];/* Place to store REFERRED-BY extension */ char refer_contact[AST_MAX_EXTENSION];/* Place to store Contact info from a REFER extension */ struct sip_pvt *refer_call; /* Call we are referring */ struct sip_route *route; /* Head of linked list of routing steps (fm Record-Route) */ char remote_party_id[256]; char context[AST_MAX_EXTENSION]; char fromdomain[AST_MAX_EXTENSION]; /* Domain to show in the from field */ char fromuser[AST_MAX_EXTENSION]; /* Domain to show in the user field */ char language[MAX_LANGUAGE]; char theirtag[256]; /* Their tag */ char username[81]; char peername[81]; char peersecret[81]; char callerid[256]; /* Caller*ID */ char via[256]; char accountcode[256]; /* Account code */ char our_contact[256]; /* Our contact header */ char realm[256]; /* Authorization realm */ char nonce[256]; /* Authorization nonce */ int amaflags; /* AMA Flags */ int pendinginvite; /* Any pending invite */ int pendingbye; /* Need to send bye after we ack? */ struct sip_request initreq; /* Initial request */ int maxtime; /* Max time for first response */ int initid; /* Auto-congest ID if appropriate */ int autokillid; /* Auto-kill ID */ int subscribed; int stateid; int dialogver; int dtmfmode; struct ast_dsp *vad; struct sip_peer *peerpoke; /* If this calls is to poke a peer, which one */ struct sip_registry *registry; /* If this is a REGISTER call, to which registry */ struct ast_rtp *rtp; /* RTP Session */ struct sip_pkt *packets; /* Packets scheduled for re-transmission */ struct sip_pvt *next; } *iflist = NULL; struct sip_pkt { struct sip_pkt *next; /* Next packet */ int retrans; /* Retransmission number */ int seqno; /* Sequence number */ int resp; /* non-zero if this is a response packet (e.g. 200 OK) */ struct sip_pvt *owner; /* Owner call */ int retransid; /* Retransmission ID */ int packetlen; /* Length of packet */ char data[0]; }; struct sip_user { /* Users who can access various contexts */ char name[80]; char secret[80]; char context[80]; char callerid[80]; char methods[80]; char accountcode[80]; unsigned int callgroup; unsigned int pickupgroup; int nat; int hascallerid; int amaflags; int insecure; int canreinvite; int dtmfmode; struct ast_ha *ha; struct sip_user *next; }; struct sip_peer { char name[80]; char secret[80]; char context[80]; /* JK02: peers need context too to allow parking etc */ char methods[80]; char username[80]; char fromuser[80]; char fromdomain[80]; char mailbox[AST_MAX_EXTENSION]; int lastmsgssent; time_t lastmsgcheck; int dynamic; int expire; int expiry; int capability; int insecure; int nat; int canreinvite; unsigned int callgroup; unsigned int pickupgroup; int dtmfmode; struct sockaddr_in addr; struct in_addr mask; /* Qualification */ struct sip_pvt *call; /* Call pointer */ int pokeexpire; /* When to expire poke */ int lastms; /* How long last response took (in ms), or -1 for no response */ int maxms; /* Max ms we will accept for the host to be up, 0 to not monitor */ struct timeval ps; /* Ping send time */ struct sockaddr_in defaddr; struct ast_ha *ha; int delme; int lastmsg; struct sip_peer *next; }; static struct ast_user_list { struct sip_user *users; pthread_mutex_t lock; } userl = { NULL, AST_MUTEX_INITIALIZER }; static struct ast_peer_list { struct sip_peer *peers; pthread_mutex_t lock; } peerl = { NULL, AST_MUTEX_INITIALIZER }; #define REG_STATE_UNREGISTERED 0 #define REG_STATE_REGSENT 1 #define REG_STATE_AUTHSENT 2 #define REG_STATE_REGISTERED 3 #define REG_STATE_REJECTED 4 #define REG_STATE_TIMEOUT 5 #define REG_STATE_NOAUTH 6 struct sip_registry { pthread_mutex_t lock; /* Channel private lock */ struct sockaddr_in addr; /* Who we connect to for registration purposes */ char username[80]; char hostname[80]; char secret[80]; /* Password or key name in []'s */ char contact[80]; /* Contact extension */ char random[80]; int expire; /* Sched ID of expiration */ int timeout; /* sched id of sip_reg_timeout */ int refresh; /* How often to refresh */ struct sip_pvt *call; /* create a sip_pvt structure for each outbound "registration call" in progress */ int regstate; int callid_valid; /* 0 means we haven't chosen callid for this registry yet. */ char callid[80]; /* Global CallID for this registry */ struct sockaddr_in us; /* Who the server thinks we are */ struct sip_registry *next; }; #define REINVITE_INVITE 1 #define REINVITE_UPDATE 2 static int sip_do_register(struct sip_registry *r); struct sip_registry *registrations; static int sipsock = -1; static int globalnat = 0; static struct sockaddr_in bindaddr; static struct ast_frame *sip_read(struct ast_channel *ast); static int transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req); static int transmit_response_with_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans); static int transmit_response_with_auth(struct sip_pvt *p, char *msg, struct sip_request *req, char *rand, int reliable); static int transmit_request(struct sip_pvt *p, char *msg, int inc, int reliable); static int transmit_request_with_auth(struct sip_pvt *p, char *msg, int inc, int reliable); static int transmit_invite(struct sip_pvt *p, char *msg, int sendsdp, char *auth, char *vxml_url); static int transmit_reinvite_with_sdp(struct sip_pvt *p, struct ast_rtp *rtp); static int transmit_info_with_digit(struct sip_pvt *p, char digit); static int transmit_message_with_text(struct sip_pvt *p, char *text); static int do_proxy_auth(struct sip_pvt *p, struct sip_request *req); char *getsipuri(char *header); static void free_old_route(struct sip_route *route); static int build_reply_digest(struct sip_pvt *p, char *orig_header, char *digest, int digest_len); static int __sip_xmit(struct sip_pvt *p, char *data, int len) { int res; if (p->nat) res=sendto(sipsock, data, len, 0, (struct sockaddr *)&p->recv, sizeof(struct sockaddr_in)); else res=sendto(sipsock, data, len, 0, (struct sockaddr *)&p->sa, sizeof(struct sockaddr_in)); if (res != len) { ast_log(LOG_WARNING, "sip_xmit of %p (len %d) to %s returned %d: %s\n", data, len, inet_ntoa(p->sa.sin_addr), res, strerror(errno)); } return res; } static void sip_destroy(struct sip_pvt *p); static int retrans_pkt(void *data) { struct sip_pkt *pkt=data; int res = 0; ast_pthread_mutex_lock(&pkt->owner->lock); if (1 /* !p->owner->needdestroy */) { if (pkt->retrans < MAX_RETRANS) { pkt->retrans++; if (sipdebug) { if (pkt->owner->nat) ast_verbose("Retransmitting #%d (NAT):\n%s\n to %s:%d\n", pkt->retrans, pkt->data, inet_ntoa(pkt->owner->recv.sin_addr), ntohs(pkt->owner->recv.sin_port)); else ast_verbose("Retransmitting #%d (no NAT):\n%s\n to %s:%d\n", pkt->retrans, pkt->data, inet_ntoa(pkt->owner->sa.sin_addr), ntohs(pkt->owner->sa.sin_port)); } __sip_xmit(pkt->owner, pkt->data, pkt->packetlen); res = 1; } else { ast_log(LOG_WARNING, "Maximum retries exceeded on call %s for seqno %d (%s)\n", pkt->owner->callid, pkt->seqno, pkt->resp ? "Response" : "Request"); pkt->retransid = -1; if (pkt->owner->owner) { /* XXX Potential deadlocK?? XXX */ ast_queue_hangup(pkt->owner->owner, 1); } else { /* If no owner, destroy now */ ast_pthread_mutex_unlock(&pkt->owner->lock); sip_destroy(pkt->owner); pkt = NULL; } } } else { /* Don't bother retransmitting. It's about to be killed anyway */ pkt->retransid = -1; if (pkt->owner->owner) { /* XXX Potential deadlocK?? XXX */ ast_queue_hangup(pkt->owner->owner, 1); } else { /* If no owner, destroy now */ ast_pthread_mutex_unlock(&pkt->owner->lock); sip_destroy(pkt->owner); pkt=NULL; } } if (pkt) ast_pthread_mutex_unlock(&pkt->owner->lock); return res; } static int __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len) { struct sip_pkt *pkt; pkt = malloc(sizeof(struct sip_pkt) + len); if (!pkt) return -1; memset(pkt, 0, sizeof(struct sip_pkt)); memcpy(pkt->data, data, len); pkt->packetlen = len; pkt->next = p->packets; pkt->owner = p; pkt->seqno = seqno; pkt->resp = resp; /* Schedule retransmission */ pkt->retransid = ast_sched_add(sched, 1000, retrans_pkt, pkt); pkt->next = p->packets; p->packets = pkt; __sip_xmit(pkt->owner, pkt->data, pkt->packetlen); if (!strncasecmp(pkt->data, "INVITE", 6)) { /* Note this is a pending invite */ p->pendinginvite = seqno; } return 0; } static int __sip_autodestruct(void *data) { struct sip_pvt *p = data; p->autokillid = -1; ast_log(LOG_DEBUG, "Auto destroying call '%s'\n", p->callid); if (p->owner) { ast_log(LOG_WARNING, "Autodestruct on call '%s' with owner in place\n", p->callid); ast_queue_hangup(p->owner, 0); } else { sip_destroy(p); } return 0; } static int sip_scheddestroy(struct sip_pvt *p, int ms) { if (p->autokillid > -1) ast_sched_del(sched, p->autokillid); p->autokillid = ast_sched_add(sched, ms, __sip_autodestruct, p); return 0; } static int sip_cancel_destroy(struct sip_pvt *p) { if (p->autokillid > -1) ast_sched_del(sched, p->autokillid); p->autokillid = -1; return 0; } static int __sip_ack(struct sip_pvt *p, int seqno, int resp) { struct sip_pkt *cur, *prev = NULL; int res = -1; int resetinvite = 0; cur = p->packets; while(cur) { if ((cur->seqno == seqno) && (cur->resp == resp)) { if (!resp && (seqno == p->pendinginvite)) { ast_log(LOG_DEBUG, "Acked pending invite %d\n", p->pendinginvite); p->pendinginvite = 0; resetinvite = 1; } /* this is our baby */ if (prev) prev->next = cur->next; else p->packets = cur->next; if (cur->retransid > -1) ast_sched_del(sched, cur->retransid); free(cur); res = 0; break; } prev = cur; cur = cur->next; } ast_log(LOG_DEBUG, "Stopping retransmission on '%s' of %s %d: %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found"); return res; } static int send_response(struct sip_pvt *p, struct sip_request *req, int reliable, int seqno) { int res; if (sipdebug) { if (p->nat) ast_verbose("%sTransmitting (NAT):\n%s\n to %s:%d\n", reliable ? "Reliably " : "", req->data, inet_ntoa(p->recv.sin_addr), ntohs(p->recv.sin_port)); else ast_verbose("%sTransmitting (no NAT):\n%s\n to %s:%d\n", reliable ? "Reliably " : "", req->data, inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port)); } if (reliable) res = __sip_reliable_xmit(p, seqno, 1, req->data, req->len); else res = __sip_xmit(p, req->data, req->len); if (res > 0) res = 0; return res; } static int send_request(struct sip_pvt *p, struct sip_request *req, int reliable, int seqno) { int res; if (sipdebug) { if (p->nat) ast_verbose("%sTransmitting:\n%s (NAT) to %s:%d\n", reliable ? "Reliably " : "", req->data, inet_ntoa(p->recv.sin_addr), ntohs(p->recv.sin_port)); else ast_verbose("%sTransmitting:\n%s (no NAT) to %s:%d\n", reliable ? "Reliably " : "", req->data, inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port)); } if (reliable) res = __sip_reliable_xmit(p, seqno, 0, req->data, req->len); else res = __sip_xmit(p, req->data, req->len); return res; } static char *ditch_braces(char *tmp) { char *c = tmp; char *n; c = tmp; if ((n = strchr(tmp, '<')) ) { c = n + 1; while(*c && *c != '>') c++; if (*c != '>') { ast_log(LOG_WARNING, "No closing brace in '%s'\n", tmp); } else { *c = '\0'; } return n+1; } return c; } static int sip_sendtext(struct ast_channel *ast, char *text) { struct sip_pvt *p = ast->pvt->pvt; if (sipdebug) ast_verbose("Sending text %s on %s\n", text, ast->name); if (!p) return -1; if (!text || !strlen(text)) return 0; if (sipdebug) ast_verbose("Really sending text %s on %s\n", text, ast->name); transmit_message_with_text(p, text); return 0; } static int create_addr(struct sip_pvt *r, char *peer) { struct hostent *hp; struct sip_peer *p; int found=0; r->sa.sin_family = AF_INET; ast_pthread_mutex_lock(&peerl.lock); p = peerl.peers; while(p) { if (!strcasecmp(p->name, peer)) { found++; r->capability = p->capability; r->nat = p->nat; if (r->rtp) { ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", r->nat); ast_rtp_setnat(r->rtp, r->nat); } strncpy(r->peername, p->username, sizeof(r->peername)-1); strncpy(r->peersecret, p->secret, sizeof(r->peersecret)-1); strncpy(r->username, p->username, sizeof(r->username)-1); if (strlen(p->fromdomain)) strncpy(r->fromdomain, p->fromdomain, sizeof(r->fromdomain)-1); if (strlen(p->fromuser)) strncpy(r->fromuser, p->fromuser, sizeof(r->fromuser)-1); r->insecure = p->insecure; r->canreinvite = p->canreinvite; r->maxtime = p->maxms; r->callgroup = p->callgroup; r->pickupgroup = p->pickupgroup; if (p->dtmfmode) { r->dtmfmode = p->dtmfmode; if (r->dtmfmode & SIP_DTMF_RFC2833) r->noncodeccapability |= AST_RTP_DTMF; else r->noncodeccapability &= ~AST_RTP_DTMF; } strncpy(r->context, p->context,sizeof(r->context)-1); if ((p->addr.sin_addr.s_addr || p->defaddr.sin_addr.s_addr) && (!p->maxms || ((p->lastms > 0) && (p->lastms <= p->maxms)))) { if (p->addr.sin_addr.s_addr) { r->sa.sin_addr = p->addr.sin_addr; r->sa.sin_port = p->addr.sin_port; } else { r->sa.sin_addr = p->defaddr.sin_addr; r->sa.sin_port = p->defaddr.sin_port; } memcpy(&r->recv, &r->sa, sizeof(r->recv)); break; } } p = p->next; } ast_pthread_mutex_unlock(&peerl.lock); if (!p && !found) { hp = gethostbyname(peer); if (hp) { memcpy(&r->sa.sin_addr, hp->h_addr, sizeof(r->sa.sin_addr)); r->sa.sin_port = htons(DEFAULT_SIP_PORT); memcpy(&r->recv, &r->sa, sizeof(r->recv)); return 0; } else { ast_log(LOG_WARNING, "No such host: %s\n", peer); return -1; } } else if (!p) return -1; else return 0; } static int auto_congest(void *nothing) { struct sip_pvt *p = nothing; ast_pthread_mutex_lock(&p->lock); p->initid = -1; if (p->owner) { if (!pthread_mutex_trylock(&p->owner->lock)) { ast_log(LOG_NOTICE, "Auto-congesting %s\n", p->owner->name); ast_queue_control(p->owner, AST_CONTROL_CONGESTION, 0); ast_pthread_mutex_unlock(&p->owner->lock); } } ast_pthread_mutex_unlock(&p->lock); return 0; } static void sip_prefs_free(void) { struct sip_codec_pref *cur, *next; cur = prefs; while(cur) { next = cur->next; free(cur); cur = next; } prefs = NULL; } static void sip_pref_remove(int format) { struct sip_codec_pref *cur, *prev=NULL; cur = prefs; while(cur) { if (cur->codec == format) { if (prev) prev->next = cur->next; else prefs = cur->next; free(cur); return; } prev = cur; cur = cur->next; } } static int sip_pref_append(int format) { struct sip_codec_pref *cur, *tmp; sip_pref_remove(format); tmp = (struct sip_codec_pref *)malloc(sizeof(struct sip_codec_pref)); if (!tmp) return -1; memset(tmp, 0, sizeof(struct sip_codec_pref)); tmp->codec = format; if (prefs) { cur = prefs; while(cur->next) cur = cur->next; cur->next = tmp; } else prefs = tmp; return 0; } static int sip_codec_choose(int formats) { struct sip_codec_pref *cur; cur = prefs; while(cur) { if (formats & cur->codec) return cur->codec; cur = cur->next; } return ast_best_codec(formats); } static int sip_call(struct ast_channel *ast, char *dest, int timeout) { int res; struct sip_pvt *p; char *vxml_url = NULL; struct varshead *headp; struct ast_var_t *current; p = ast->pvt->pvt; if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) { ast_log(LOG_WARNING, "sip_call called on %s, neither down nor reserved\n", ast->name); return -1; } /* Check whether there is a VXML_URL variable */ headp=&ast->varshead; AST_LIST_TRAVERSE(headp,current,entries) { if (strcasecmp(ast_var_name(current),"VXML_URL")==0) { vxml_url = ast_var_value(current); break; } } res = 0; p->outgoing = 1; transmit_invite(p, "INVITE", 1, NULL, vxml_url); if (p->maxtime) { /* Initialize auto-congest time */ p->initid = ast_sched_add(sched, p->maxtime * 2, auto_congest, p); } return res; } static void __sip_destroy(struct sip_pvt *p, int lockowner) { struct sip_pvt *cur, *prev = NULL; struct sip_pkt *cp; if (sipdebug) ast_log(LOG_DEBUG, "Destorying call '%s'\n", p->callid); if (p->stateid > -1) ast_extension_state_del(p->stateid, NULL); if (p->initid > -1) ast_sched_del(sched, p->initid); if (p->autokillid > -1) ast_sched_del(sched, p->autokillid); if (p->rtp) { ast_rtp_destroy(p->rtp); } if (p->route) { free_old_route(p->route); p->route = NULL; } /* Unlink us from the owner if we have one */ if (p->owner) { if (lockowner) ast_pthread_mutex_lock(&p->owner->lock); ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name); p->owner->pvt->pvt = NULL; if (lockowner) ast_pthread_mutex_unlock(&p->owner->lock); } cur = iflist; while(cur) { if (cur == p) { if (prev) prev->next = cur->next; else iflist = cur->next; break; } prev = cur; cur = cur->next; } if (!cur) { ast_log(LOG_WARNING, "%p is not in list?!?! \n", cur); } else { if (p->initid > -1) ast_sched_del(sched, p->initid); while((cp = p->packets)) { p->packets = p->packets->next; if (cp->retransid > -1) ast_sched_del(sched, cp->retransid); free(cp); } free(p); } } static void sip_destroy(struct sip_pvt *p) { ast_pthread_mutex_lock(&iflock); __sip_destroy(p, 1); ast_pthread_mutex_unlock(&iflock); } /* Interface lookup code courtesy Tilghman of DrunkCoder.com. Thanks! */ struct my_ifreq { char ifrn_name[IFNAMSIZ]; /* Interface name, e.g. "en0". */ struct sockaddr_in ifru_addr; }; struct in_addr *lookup_iface(char *iface) { int mysock; int res; static struct my_ifreq ifreq; memset(&ifreq, 0, sizeof(ifreq)); strncpy(ifreq.ifrn_name,iface,sizeof(ifreq.ifrn_name) - 1); mysock = socket(PF_INET,SOCK_DGRAM,IPPROTO_IP); res = ioctl(mysock,SIOCGIFADDR,&ifreq); close(mysock); if (res < 0) { ast_log(LOG_WARNING, "Unable to get IP of %s: %s\n", iface, strerror(errno)); return &__ourip; } return( (struct in_addr *) &ifreq.ifru_addr.sin_addr ); } static struct in_addr *myaddrfor(struct in_addr *them) { FILE *PROC; struct in_addr *temp = NULL; unsigned int remote_ip; char line[256]; remote_ip = them->s_addr; PROC = fopen("/proc/net/route","r"); if (!PROC) { /* If /proc/net/route doesn't exist, fall back to the old method */ return &__ourip; } /* First line contains headers */ fgets(line,sizeof(line),PROC); while (!feof(PROC)) { char iface[8]; unsigned int dest, gateway, mask; int i,aoffset; char *fields[40]; fgets(line,sizeof(line),PROC); aoffset = 0; for (i=0;ipvt->pvt; int needcancel = 0; int needdestroy = 0; if (option_debug) ast_log(LOG_DEBUG, "sip_hangup(%s)\n", ast->name); if (!ast->pvt->pvt) { ast_log(LOG_DEBUG, "Asked to hangup channel not connected\n"); return 0; } ast_pthread_mutex_lock(&p->lock); /* Determine how to disconnect */ if (p->owner != ast) { ast_log(LOG_WARNING, "Huh? We aren't the owner?\n"); ast_pthread_mutex_unlock(&p->lock); return 0; } if (!ast || (ast->_state != AST_STATE_UP)) needcancel = 1; /* Disconnect */ p = ast->pvt->pvt; if (p->vad) { ast_dsp_free(p->vad); } p->owner = NULL; ast->pvt->pvt = NULL; needdestroy = 1; /* Start the process if it's not already started */ if (!p->alreadygone && strlen(p->initreq.data)) { if (needcancel) { if (p->outgoing) { transmit_request_with_auth(p, "CANCEL", p->ocseq, 1); /* Actually don't destroy us yet, wait for the 487 on our original INVITE, but do set an autodestruct just in case. */ needdestroy = 0; sip_scheddestroy(p, 15000); } else transmit_response_reliable(p, "403 Forbidden", &p->initreq); } else { if (!p->pendinginvite) { /* Send a hangup */ transmit_request_with_auth(p, "BYE", 0, 1); } else { /* Note we will need a BYE when this all settles out but we can't send one while we have "INVITE" outstanding. */ p->pendingbye = 1; } } } p->needdestroy = needdestroy; ast_pthread_mutex_unlock(&p->lock); return 0; } static int sip_answer(struct ast_channel *ast) { int res = 0,fmt; char *codec; struct sip_pvt *p = ast->pvt->pvt; if (ast->_state != AST_STATE_UP) { codec=pbx_builtin_getvar_helper(p->owner,"SIP_CODEC"); if (codec) { ast_log(LOG_NOTICE, "Changing codec to '%s' for this call because of ${SIP_CODEC) variable\n",codec); fmt=ast_getformatbyname(codec); if (fmt) { p->capability=fmt; } else ast_log(LOG_NOTICE, "Ignoring ${SIP_CODEC} variable because of unrecognized codec: %s\n",codec); } ast_setstate(ast, AST_STATE_UP); if (option_debug) ast_log(LOG_DEBUG, "sip_answer(%s)\n", ast->name); res = transmit_response_with_sdp(p, "200 OK", &p->initreq, 1); } return res; } static int sip_write(struct ast_channel *ast, struct ast_frame *frame) { struct sip_pvt *p = ast->pvt->pvt; int res = 0; if (frame->frametype != AST_FRAME_VOICE) { if (frame->frametype == AST_FRAME_IMAGE) return 0; else { ast_log(LOG_WARNING, "Can't send %d type frames with SIP write\n", frame->frametype); return 0; } } else { if (!(frame->subclass & ast->nativeformats)) { ast_log(LOG_WARNING, "Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n", frame->subclass, ast->nativeformats, ast->readformat, ast->writeformat); return -1; } } if (p) { ast_pthread_mutex_lock(&p->lock); if (p->rtp) { if ((ast->_state != AST_STATE_UP) && !p->progress && !p->outgoing) { transmit_response_with_sdp(p, "183 Session Progress", &p->initreq, 0); p->progress = 1; } res = ast_rtp_write(p->rtp, frame); } ast_pthread_mutex_unlock(&p->lock); } return res; } static int sip_fixup(struct ast_channel *oldchan, struct ast_channel *newchan) { struct sip_pvt *p = newchan->pvt->pvt; ast_pthread_mutex_lock(&p->lock); if (p->owner != oldchan) { ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, p->owner); ast_pthread_mutex_unlock(&p->lock); return -1; } p->owner = newchan; ast_pthread_mutex_unlock(&p->lock); return 0; } static int sip_senddigit(struct ast_channel *ast, char digit) { struct sip_pvt *p = ast->pvt->pvt; if (p && (p->dtmfmode & SIP_DTMF_INFO)) { transmit_info_with_digit(p, digit); } if (p && p->rtp && (p->dtmfmode & SIP_DTMF_RFC2833)) { ast_rtp_senddigit(p->rtp, digit); } /* If in-band DTMF is desired, send that */ if (p->dtmfmode & SIP_DTMF_INBAND) return -1; return 0; } static int sip_indicate(struct ast_channel *ast, int condition) { struct sip_pvt *p = ast->pvt->pvt; switch(condition) { case AST_CONTROL_RINGING: if (ast->_state == AST_STATE_RING) { if (!p->progress) { transmit_response(p, "180 Ringing", &p->initreq); break; } else { /* Oops, we've sent progress tones. Let Asterisk do it instead */ } } return -1; case AST_CONTROL_BUSY: if (ast->_state != AST_STATE_UP) { transmit_response(p, "600 Busy everywhere", &p->initreq); p->alreadygone = 1; ast_softhangup(ast, AST_SOFTHANGUP_DEV); break; } return -1; case AST_CONTROL_CONGESTION: if (ast->_state != AST_STATE_UP) { transmit_response(p, "486 Busy here", &p->initreq); p->alreadygone = 1; ast_softhangup(ast, AST_SOFTHANGUP_DEV); break; } return -1; case -1: return -1; default: ast_log(LOG_WARNING, "Don't know how to indicate condition %d\n", condition); return -1; } return 0; } static struct ast_channel *sip_new(struct sip_pvt *i, int state, char *title) { struct ast_channel *tmp; int fmt; tmp = ast_channel_alloc(1); if (tmp) { /* Select our native format based on codec preference until we receive something from another device to the contrary. */ if (i->capability) tmp->nativeformats = sip_codec_choose(i->capability); else tmp->nativeformats = sip_codec_choose(capability); fmt = ast_best_codec(tmp->nativeformats); if (title) snprintf(tmp->name, sizeof(tmp->name), "SIP/%s-%04x", title, rand() & 0xffff); else snprintf(tmp->name, sizeof(tmp->name), "SIP/%s:%d", inet_ntoa(i->sa.sin_addr), ntohs(i->sa.sin_port)); tmp->type = type; if (i->dtmfmode & SIP_DTMF_INBAND) { i->vad = ast_dsp_new(); ast_dsp_set_features(i->vad, DSP_FEATURE_DTMF_DETECT); } tmp->fds[0] = ast_rtp_fd(i->rtp); ast_setstate(tmp, state); if (state == AST_STATE_RING) tmp->rings = 1; tmp->adsicpe = AST_ADSI_UNAVAILABLE; tmp->writeformat = fmt; tmp->pvt->rawwriteformat = fmt; tmp->readformat = fmt; tmp->pvt->rawreadformat = fmt; tmp->pvt->pvt = i; tmp->pvt->send_text = sip_sendtext; tmp->pvt->call = sip_call; tmp->pvt->hangup = sip_hangup; tmp->pvt->answer = sip_answer; tmp->pvt->read = sip_read; tmp->pvt->write = sip_write; tmp->pvt->indicate = sip_indicate; tmp->pvt->fixup = sip_fixup; tmp->pvt->send_digit = sip_senddigit; tmp->pvt->bridge = ast_rtp_bridge; tmp->callgroup = i->callgroup; tmp->pickupgroup = i->pickupgroup; if (strlen(i->language)) strncpy(tmp->language, i->language, sizeof(tmp->language)-1); i->owner = tmp; ast_pthread_mutex_lock(&usecnt_lock); usecnt++; ast_pthread_mutex_unlock(&usecnt_lock); ast_update_use_count(); strncpy(tmp->context, i->context, sizeof(tmp->context)-1); strncpy(tmp->exten, i->exten, sizeof(tmp->exten)-1); if (strlen(i->callerid)) tmp->callerid = strdup(i->callerid); tmp->priority = 1; if (state != AST_STATE_DOWN) { if (ast_pbx_start(tmp)) { ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name); ast_hangup(tmp); tmp = NULL; } } } else ast_log(LOG_WARNING, "Unable to allocate channel structure\n"); return tmp; } static struct cfalias { char *fullname; char *shortname; } aliases[] = { { "Content-Type", "c" }, { "Content-Encoding", "e" }, { "From", "f" }, { "Call-ID", "i" }, { "Contact", "m" }, { "Content-Length", "l" }, { "Subject", "s" }, { "To", "t" }, { "Via", "v" }, }; static char* get_sdp_by_line(char* line, char *name, int nameLen) { if (strncasecmp(line, name, nameLen) == 0 && line[nameLen] == '=') { char* r = line + nameLen + 1; while (*r && (*r < 33)) ++r; return r; } return ""; } static char *get_sdp(struct sip_request *req, char *name) { int x; int len = strlen(name); char *r; for (x=0; xlines; x++) { r = get_sdp_by_line(req->line[x], name, len); if (r[0] != '\0') return r; } return ""; } static void sdpLineNum_iterator_init(int* iterator) { *iterator = 0; } static char* get_sdp_iterate(int* iterator, struct sip_request *req, char *name) { int len = strlen(name); char *r; while (*iterator < req->lines) { r = get_sdp_by_line(req->line[(*iterator)++], name, len); if (r[0] != '\0') return r; } return ""; } static char *__get_header(struct sip_request *req, char *name, int *start) { int x; int len = strlen(name); char *r; for (x=*start;xheaders;x++) { if (!strncasecmp(req->header[x], name, len) && (req->header[x][len] == ':')) { r = req->header[x] + len + 1; while(*r && (*r < 33)) r++; *start = x+1; return r; } } /* Try aliases */ for (x=0;xlock is already held. */ struct ast_frame *f; static struct ast_frame null_frame = { AST_FRAME_NULL, }; f = ast_rtp_read(p->rtp); /* Don't send RFC2833 if we're not supposed to */ if (f && (f->frametype == AST_FRAME_DTMF) && !(p->dtmfmode & SIP_DTMF_RFC2833)) return &null_frame; if (p->owner) { /* We already hold the channel lock */ if (f->frametype == AST_FRAME_VOICE) { if (f->subclass != p->owner->nativeformats) { ast_log(LOG_DEBUG, "Oooh, format changed to %d\n", f->subclass); p->owner->nativeformats = f->subclass; ast_set_read_format(p->owner, p->owner->readformat); ast_set_write_format(p->owner, p->owner->writeformat); } if (p->dtmfmode & SIP_DTMF_INBAND) { f = ast_dsp_process(p->owner,p->vad,f,0); } } } return f; } static struct ast_frame *sip_read(struct ast_channel *ast) { struct ast_frame *fr; struct sip_pvt *p = ast->pvt->pvt; ast_pthread_mutex_lock(&p->lock); fr = sip_rtp_read(p); ast_pthread_mutex_unlock(&p->lock); return fr; } static void build_callid(char *callid, int len, struct in_addr ourip) { int res; int val; int x; for (x=0;x<4;x++) { val = rand(); res = snprintf(callid, len, "%08x", val); len -= res; callid += res; } /* It's not important that we really use our right IP here... */ snprintf(callid, len, "@%s", inet_ntoa(ourip)); } static struct sip_pvt *sip_alloc(char *callid, struct sockaddr_in *sin, int useglobalnat) { struct sip_pvt *p; p = malloc(sizeof(struct sip_pvt)); if (!p) return NULL; /* Keep track of stuff */ memset(p, 0, sizeof(struct sip_pvt)); p->initid = -1; p->autokillid = -1; p->stateid = -1; p->rtp = ast_rtp_new(NULL, NULL); p->branch = rand(); p->tag = rand(); /* Start with 101 instead of 1 */ p->ocseq = 101; if (!p->rtp) { ast_log(LOG_WARNING, "Unable to create RTP session: %s\n", strerror(errno)); free(p); return NULL; } ast_rtp_settos(p->rtp, tos); if (useglobalnat && sin) { /* Setup NAT structure according to global settings if we have an address */ p->nat = globalnat; memcpy(&p->recv, sin, sizeof(p->recv)); ast_rtp_setnat(p->rtp, p->nat); } ast_pthread_mutex_init(&p->lock); #if 0 ast_rtp_set_data(p->rtp, p); ast_rtp_set_callback(p->rtp, rtpready); #endif if (sin) { memcpy(&p->sa, sin, sizeof(p->sa)); memcpy(&p->ourip, myaddrfor(&p->sa.sin_addr), sizeof(p->ourip)); } else { memcpy(&p->ourip, &__ourip, sizeof(p->ourip)); } snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", inet_ntoa(p->ourip), ourport, p->branch); if (!callid) build_callid(p->callid, sizeof(p->callid), p->ourip); else strncpy(p->callid, callid, sizeof(p->callid) - 1); /* Assume reinvite OK and via INVITE */ p->canreinvite = REINVITE_INVITE; p->dtmfmode = globaldtmfmode; if (p->dtmfmode & SIP_DTMF_RFC2833) p->noncodeccapability |= AST_RTP_DTMF; strncpy(p->context, context, sizeof(p->context) - 1); strncpy(p->fromdomain, fromdomain, sizeof(p->fromdomain) - 1); /* Add to list */ ast_pthread_mutex_lock(&iflock); p->next = iflist; iflist = p; ast_pthread_mutex_unlock(&iflock); if (option_debug) ast_log(LOG_DEBUG, "Allocating new SIP call for %s\n", callid); return p; } static struct sip_pvt *find_call(struct sip_request *req, struct sockaddr_in *sin) { struct sip_pvt *p; char *callid; callid = get_header(req, "Call-ID"); if (!strlen(callid)) { ast_log(LOG_WARNING, "Call missing call ID from '%s'\n", inet_ntoa(sin->sin_addr)); return NULL; } ast_pthread_mutex_lock(&iflock); p = iflist; while(p) { if (!strcmp(p->callid, callid)) { /* Found the call */ #if 0 if (!p->insecure && ((p->sa.sin_addr.s_addr != sin->sin_addr.s_addr) || (p->sa.sin_port != sin->sin_port))) { char orig[80]; char new[80]; snprintf(orig, sizeof(orig), "%s:%d", inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port)); snprintf(new, sizeof(new), "%s:%d", inet_ntoa(sin->sin_addr), ntohs(sin->sin_port)); ast_log(LOG_WARNING, "Looks like %s is trying to steal call '%s' from %s?\n", new, p->callid, orig); ast_pthread_mutex_unlock(&iflock); return NULL; } #endif ast_pthread_mutex_lock(&p->lock); ast_pthread_mutex_unlock(&iflock); return p; } p = p->next; } ast_pthread_mutex_unlock(&iflock); return sip_alloc(callid, sin, 1); } static int sip_register(char *value, int lineno) { struct sip_registry *reg; char copy[256] = ""; char *username, *hostname, *secret; char *porta; char *contact; char *stringp=NULL; struct hostent *hp; if (!value) return -1; strncpy(copy, value, sizeof(copy)-1); stringp=copy; username = stringp; hostname = strrchr(stringp, '@'); if (hostname) { *hostname = '\0'; hostname++; } if (!hostname) { ast_log(LOG_WARNING, "Format for registration is user[:secret]@host[:port] at line %d", lineno); return -1; } stringp=username; username = strsep(&stringp, ":"); secret = strsep(&stringp, ":"); stringp = hostname; hostname = strsep(&stringp, "/"); contact = strsep(&stringp, "/"); if (!contact || !strlen(contact)) contact = "s"; stringp=hostname; hostname = strsep(&stringp, ":"); porta = strsep(&stringp, ":"); if (porta && !atoi(porta)) { ast_log(LOG_WARNING, "%s is not a valid port number at line %d\n", porta, lineno); return -1; } hp = gethostbyname(hostname); if (!hp) { ast_log(LOG_WARNING, "Host '%s' not found at line %d\n", hostname, lineno); return -1; } reg = malloc(sizeof(struct sip_registry)); if (reg) { memset(reg, 0, sizeof(struct sip_registry)); strncpy(reg->contact, contact, sizeof(reg->contact) - 1); strncpy(reg->username, username, sizeof(reg->username)-1); strncpy(reg->hostname, hostname, sizeof(reg->hostname)-1); if (secret) strncpy(reg->secret, secret, sizeof(reg->secret)-1); reg->expire = -1; reg->timeout = -1; reg->refresh = default_expiry; reg->addr.sin_family = AF_INET; memcpy(®->addr.sin_addr, hp->h_addr, sizeof(®->addr.sin_addr)); reg->addr.sin_port = porta ? htons(atoi(porta)) : htons(DEFAULT_SIP_PORT); reg->next = registrations; reg->callid_valid = 0; registrations = reg; } else { ast_log(LOG_ERROR, "Out of memory\n"); return -1; } return 0; } static void parse(struct sip_request *req) { /* Divide fields by NULL's */ char *c; int f = 0; c = req->data; /* First header starts immediately */ req->header[f] = c; while(*c) { if (*c == '\n') { /* We've got a new header */ *c = 0; #if 0 printf("Header: %s (%d)\n", req->header[f], strlen(req->header[f])); #endif if (!strlen(req->header[f])) { /* Line by itself means we're now in content */ c++; break; } if (f >= SIP_MAX_HEADERS - 1) { ast_log(LOG_WARNING, "Too many SIP headers...\n"); } else f++; req->header[f] = c + 1; } else if (*c == '\r') { /* Ignore but eliminate \r's */ *c = 0; } c++; } /* Check for last header */ if (strlen(req->header[f])) f++; req->headers = f; /* Now we process any mime content */ f = 0; req->line[f] = c; while(*c) { if (*c == '\n') { /* We've got a new line */ *c = 0; #if 0 printf("Line: %s (%d)\n", req->line[f], strlen(req->line[f])); #endif if (f >= SIP_MAX_LINES - 1) { ast_log(LOG_WARNING, "Too many SDP lines...\n"); } else f++; req->line[f] = c + 1; } else if (*c == '\r') { /* Ignore and eliminate \r's */ *c = 0; } c++; } /* Check for last line */ if (strlen(req->line[f])) f++; req->lines = f; if (sipdebug) ast_verbose("%d headers, %d lines\n", req->headers, req->lines); if (*c) ast_log(LOG_WARNING, "Odd content, extra stuff left over ('%s')\n", c); } static int process_sdp(struct sip_pvt *p, struct sip_request *req) { char *m; char *c; char *a; char host[258]; int len = -1; int portno; int peercapability, peernoncodeccapability; struct sockaddr_in sin; char *codecs; struct hostent *hp; int codec; int iterator; /* Get codec and RTP info from SDP */ if (strcasecmp(get_header(req, "Content-Type"), "application/sdp")) { ast_log(LOG_NOTICE, "Content is '%s', not 'application/sdp'\n", get_header(req, "Content-Type")); return -1; } m = get_sdp(req, "m"); c = get_sdp(req, "c"); if (!strlen(m) || !strlen(c)) { ast_log(LOG_WARNING, "Insufficient information for SDP (m = '%s', c = '%s')\n", m, c); return -1; } if (sscanf(c, "IN IP4 %256s", host) != 1) { ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c); return -1; } /* XXX This could block for a long time, and block the main thread! XXX */ hp = gethostbyname(host); if (!hp) { ast_log(LOG_WARNING, "Unable to lookup host in c= line, '%s'\n", c); return -1; } if ((sscanf(m, "audio %d RTP/AVP %n", &portno, &len) != 1) || (len < 0)) { ast_log(LOG_WARNING, "Unable to determine port number for RTP in '%s'\n", m); return -1; } sin.sin_family = AF_INET; memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr)); sin.sin_port = htons(portno); if (p->rtp) ast_rtp_set_peer(p->rtp, &sin); #if 0 printf("Peer RTP is at port %s:%d\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port)); #endif // Scan through the RTP payload types specified in a "m=" line: ast_rtp_pt_clear(p->rtp); codecs = m + len; while(strlen(codecs)) { if (sscanf(codecs, "%d%n", &codec, &len) != 1) { ast_log(LOG_WARNING, "Error in codec string '%s'\n", codecs); return -1; } ast_rtp_set_m_type(p->rtp, codec); codecs += len; /* Skip over any whitespace */ while(*codecs && (*codecs < 33)) codecs++; } // Next, scan through each "a=rtpmap:" line, noting each // specified RTP payload type (with corresponding MIME subtype): sdpLineNum_iterator_init(&iterator); while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') { char* mimeSubtype = strdup(a); // ensures we have enough space if (sscanf(a, "rtpmap: %u %[^/]/", &codec, mimeSubtype) != 2) continue; // Note: should really look at the 'freq' and '#chans' params too ast_rtp_set_rtpmap_type(p->rtp, codec, "audio", mimeSubtype); free(mimeSubtype); } // Now gather all of the codecs that were asked for: ast_rtp_get_current_formats(p->rtp, &peercapability, &peernoncodeccapability); p->capability = capability & peercapability; p->noncodeccapability = noncodeccapability & peernoncodeccapability; if (sipdebug) { ast_verbose("Capabilities: us - %d, them - %d, combined - %d\n", capability, peercapability, p->capability); ast_verbose("Non-codec capabilities: us - %d, them - %d, combined - %d\n", noncodeccapability, peernoncodeccapability, p->noncodeccapability); } if (!p->capability) { ast_log(LOG_WARNING, "No compatible codecs!\n"); return -1; } if (p->owner) { if (!(p->owner->nativeformats & p->capability)) { ast_log(LOG_DEBUG, "Oooh, we need to change our formats since our peer supports only %d and not %d\n", p->capability, p->owner->nativeformats); p->owner->nativeformats = sip_codec_choose(p->capability); ast_set_read_format(p->owner, p->owner->readformat); ast_set_write_format(p->owner, p->owner->writeformat); } if (p->owner->bridge) { /* Turn on/off music on hold if we are holding/unholding */ if (sin.sin_addr.s_addr) { ast_moh_stop(p->owner->bridge); } else { ast_moh_start(p->owner->bridge, NULL); } } } return 0; } static int add_header(struct sip_request *req, char *var, char *value) { if (req->len >= sizeof(req->data) - 4) { ast_log(LOG_WARNING, "Out of space, can't add anymore\n"); return -1; } if (req->lines) { ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n"); return -1; } req->header[req->headers] = req->data + req->len; snprintf(req->header[req->headers], sizeof(req->data) - req->len - 4, "%s: %s\r\n", var, value); req->len += strlen(req->header[req->headers]); if (req->headers < SIP_MAX_HEADERS) req->headers++; else { ast_log(LOG_WARNING, "Out of header space\n"); return -1; } return 0; } static int add_blank_header(struct sip_request *req) { if (req->len >= sizeof(req->data) - 4) { ast_log(LOG_WARNING, "Out of space, can't add anymore\n"); return -1; } if (req->lines) { ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n"); return -1; } req->header[req->headers] = req->data + req->len; snprintf(req->header[req->headers], sizeof(req->data) - req->len, "\r\n"); req->len += strlen(req->header[req->headers]); if (req->headers < SIP_MAX_HEADERS) req->headers++; else { ast_log(LOG_WARNING, "Out of header space\n"); return -1; } return 0; } static int add_line(struct sip_request *req, char *line) { if (req->len >= sizeof(req->data) - 4) { ast_log(LOG_WARNING, "Out of space, can't add anymore\n"); return -1; } if (!req->lines) { /* Add extra empty return */ snprintf(req->data + req->len, sizeof(req->data) - req->len, "\r\n"); req->len += strlen(req->data + req->len); } req->line[req->lines] = req->data + req->len; snprintf(req->line[req->lines], sizeof(req->data) - req->len, "%s", line); req->len += strlen(req->line[req->lines]); if (req->lines < SIP_MAX_LINES) req->lines++; else { ast_log(LOG_WARNING, "Out of line space\n"); return -1; } return 0; } static int copy_header(struct sip_request *req, struct sip_request *orig, char *field) { char *tmp; tmp = get_header(orig, field); if (strlen(tmp)) { /* Add what we're responding to */ return add_header(req, field, tmp); } ast_log(LOG_NOTICE, "No field '%s' present to copy\n", field); return -1; } static int copy_all_header(struct sip_request *req, struct sip_request *orig, char *field) { char *tmp; int start = 0; int copied = 0; for (;;) { tmp = __get_header(orig, field, &start); if (strlen(tmp)) { /* Add what we're responding to */ add_header(req, field, tmp); copied++; } else break; } return copied ? 0 : -1; } static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, struct sip_request *orig, char *field) { char *tmp; int start = 0; int copied = 0; char new[256]; for (;;) { tmp = __get_header(orig, field, &start); if (strlen(tmp)) { if (!copied && p->nat) { /* SLD: FIXME: Nice try, but the received= should not have a port */ /* SLD: FIXME: See RFC2543 BNF in Section 6.40.5 */ if (ntohs(p->recv.sin_port) != DEFAULT_SIP_PORT) snprintf(new, sizeof(new), "%s;received=%s:%d", tmp, inet_ntoa(p->recv.sin_addr), ntohs(p->recv.sin_port)); else snprintf(new, sizeof(new), "%s;received=%s", tmp, inet_ntoa(p->recv.sin_addr)); add_header(req, field, new); } else { /* Add what we're responding to */ add_header(req, field, tmp); } copied++; } else break; } if (!copied) { ast_log(LOG_NOTICE, "No field '%s' present to copy\n", field); return -1; } return 0; } /* Add Route: header into request per learned route */ static void add_route(struct sip_request *req, struct sip_route *route) { char r[256], *p; int n, rem = 255; /* sizeof(r)-1: Room for terminating 0 */ if (!route) return; p = r; while (route) { n = strlen(route->hop); if ((n+3)>rem) break; if (p != r) { *p++ = ','; --rem; } *p++ = '<'; strcpy(p, route->hop); p += n; *p++ = '>'; rem -= (n+2); route = route->next; } *p = '\0'; add_header(req, "Route", r); } static void set_destination(struct sip_pvt *p, char *uri) { char *h, *maddr, hostname[256]; int port, hn; struct hostent *hp; /* Parse uri to h (host) and port - uri is already just the part inside the <> */ /* general form we are expecting is sip[s]:username[:password]@host[:port][;...] */ if (sipdebug) ast_verbose("set_destination: Parsing <%s> for address/port to send to\n", uri); /* Find and parse hostname */ h = strchr(uri, '@'); if (h) ++h; else { h = uri; if (strncmp(h, "sip:", 4) == 0) h += 4; else if (strncmp(h, "sips:", 5) == 0) h += 5; } hn = strcspn(h, ":;>"); if (hn>255) hn=255; strncpy(hostname, h, hn); hostname[hn] = '\0'; h+=hn; /* Is "port" present? if not default to 5060 */ if (*h == ':') { /* Parse port */ ++h; port = strtol(h, &h, 10); } else port = 5060; /* Got the hostname:port - but maybe there's a "maddr=" to override address? */ maddr = strstr(h, "maddr="); if (maddr) { maddr += 6; hn = strspn(maddr, "0123456789."); if (hn>255) hn=255; strncpy(hostname, maddr, hn); hostname[hn] = '\0'; } hp = gethostbyname(hostname); if (hp == NULL) { ast_log(LOG_WARNING, "Can't find address for host '%s'\n", hostname); return; } p->sa.sin_family = AF_INET; memcpy(&p->sa.sin_addr, hp->h_addr, sizeof(p->sa.sin_addr)); p->sa.sin_port = htons(port); if (sipdebug) ast_verbose("set_destination: set destination to %s, port %d\n", inet_ntoa(p->sa.sin_addr), port); } static int init_resp(struct sip_request *req, char *resp, struct sip_request *orig) { /* Initialize a response */ if (req->headers || req->len) { ast_log(LOG_WARNING, "Request already initialized?!?\n"); return -1; } req->header[req->headers] = req->data + req->len; snprintf(req->header[req->headers], sizeof(req->data) - req->len, "SIP/2.0 %s\r\n", resp); req->len += strlen(req->header[req->headers]); if (req->headers < SIP_MAX_HEADERS) req->headers++; else ast_log(LOG_WARNING, "Out of header space\n"); return 0; } static int init_req(struct sip_request *req, char *resp, char *recip) { /* Initialize a response */ if (req->headers || req->len) { ast_log(LOG_WARNING, "Request already initialized?!?\n"); return -1; } req->header[req->headers] = req->data + req->len; snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %s SIP/2.0\r\n", resp, recip); req->len += strlen(req->header[req->headers]); if (req->headers < SIP_MAX_HEADERS) req->headers++; else ast_log(LOG_WARNING, "Out of header space\n"); return 0; } static int respprep(struct sip_request *resp, struct sip_pvt *p, char *msg, struct sip_request *req) { char newto[256] = "", *ot; memset(resp, 0, sizeof(*resp)); init_resp(resp, msg, req); copy_via_headers(p, resp, req, "Via"); if (msg[0] == '2') copy_all_header(resp, req, "Record-Route"); copy_header(resp, req, "From"); ot = get_header(req, "To"); if (!strstr(ot, "tag=")) { /* Add the proper tag if we don't have it already. If they have specified their tag, use it. Otherwise, use our own tag */ if (strlen(p->theirtag) && p->outgoing) snprintf(newto, sizeof(newto), "%s;tag=%s", ot, p->theirtag); else if (p->tag && !p->outgoing) snprintf(newto, sizeof(newto), "%s;tag=as%08x", ot, p->tag); else strncpy(newto, ot, sizeof(newto) - 1); ot = newto; } add_header(resp, "To", ot); copy_header(resp, req, "Call-ID"); copy_header(resp, req, "CSeq"); add_header(resp, "User-Agent", "Asterisk PBX"); if (p->expiry) { /* For registration responses, we also need expiry and contact info */ char contact[256]; char tmp[256]; snprintf(contact, sizeof(contact), "%s;expires=%d", p->our_contact, p->expiry); snprintf(tmp, sizeof(tmp), "%d", p->expiry); add_header(resp, "Expires", tmp); add_header(resp, "Contact", contact); } else { add_header(resp, "Contact", p->our_contact); } return 0; } static int reqprep(struct sip_request *req, struct sip_pvt *p, char *msg, int seqno) { struct sip_request *orig = &p->initreq; char stripped[80] =""; char tmp[80]; char newto[256]; char *c, *n; char *ot, *of; memset(req, 0, sizeof(struct sip_request)); if (!seqno) { p->ocseq++; seqno = p->ocseq; } if (p->outgoing) strncpy(stripped, get_header(orig, "To"), sizeof(stripped) - 1); else strncpy(stripped, get_header(orig, "From"), sizeof(stripped) - 1); c = strchr(stripped, '<'); if (c) c++; else c = stripped; n = strchr(c, '>'); if (n) *n = '\0'; n = strchr(c, ';'); if (n) *n = '\0'; init_req(req, msg, c); snprintf(tmp, sizeof(tmp), "%d %s", seqno, msg); add_header(req, "Via", p->via); if (p->route) { set_destination(p, p->route->hop); add_route(req, p->route->next); } ot = get_header(orig, "To"); of = get_header(orig, "From"); /* Add tag *unless* this is a CANCEL, in which case we need to send it exactly as our original request, including tag (or presumably lack thereof) */ if (!strstr(ot, "tag=") && strcasecmp(msg, "CANCEL")) { /* Add the proper tag if we don't have it already. If they have specified their tag, use it. Otherwise, use our own tag */ if (p->outgoing && strlen(p->theirtag)) snprintf(newto, sizeof(newto), "%s;tag=%s", ot, p->theirtag); else if (!p->outgoing) snprintf(newto, sizeof(newto), "%s;tag=as%08x", ot, p->tag); else snprintf(newto, sizeof(newto), "%s", ot); ot = newto; } if (p->outgoing) { add_header(req, "From", of); add_header(req, "To", ot); } else { add_header(req, "From", ot); add_header(req, "To", of); } add_header(req, "Contact", p->our_contact); copy_header(req, orig, "Call-ID"); add_header(req, "CSeq", tmp); add_header(req, "User-Agent", "Asterisk PBX"); return 0; } static int __transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req, int reliable) { struct sip_request resp; int seqno = 0; if (reliable && (sscanf(get_header(req, "CSeq"), "%i ", &seqno) != 1)) { ast_log(LOG_WARNING, "Unable to determine sequence number from '%s'\n", get_header(req, "CSeq")); return -1; } respprep(&resp, p, msg, req); add_header(&resp, "Content-Length", "0"); add_blank_header(&resp); return send_response(p, &resp, reliable, seqno); } static int transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req) { return __transmit_response(p, msg, req, 0); } static int transmit_response_reliable(struct sip_pvt *p, char *msg, struct sip_request *req) { return __transmit_response(p, msg, req, 1); } static void append_date(struct sip_request *req) { char tmpdat[256]; struct tm tm; time_t t; time(&t); gmtime_r(&t, &tm); strftime(tmpdat, sizeof(tmpdat), "%a, %d %b %Y %T GMT", &tm); add_header(req, "Date", tmpdat); } static int transmit_response_with_date(struct sip_pvt *p, char *msg, struct sip_request *req) { struct sip_request resp; respprep(&resp, p, msg, req); append_date(&resp); add_header(&resp, "Content-Length", "0"); add_blank_header(&resp); return send_response(p, &resp, 0, 0); } static int transmit_response_with_allow(struct sip_pvt *p, char *msg, struct sip_request *req) { struct sip_request resp; respprep(&resp, p, msg, req); add_header(&resp, "Allow", "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER"); add_header(&resp, "Accept", "application/sdp"); add_header(&resp, "Content-Length", "0"); add_blank_header(&resp); return send_response(p, &resp, 0, 0); } static int transmit_response_with_auth(struct sip_pvt *p, char *msg, struct sip_request *req, char *randdata, int reliable) { struct sip_request resp; char tmp[256]; int seqno = 0; if (reliable && (sscanf(get_header(req, "CSeq"), "%i ", &seqno) != 1)) { ast_log(LOG_WARNING, "Unable to determine sequence number from '%s'\n", get_header(req, "CSeq")); return -1; } snprintf(tmp, sizeof(tmp), "Digest realm=\"asterisk\", nonce=\"%s\"", randdata); respprep(&resp, p, msg, req); add_header(&resp, "Proxy-Authenticate", tmp); add_header(&resp, "Content-Length", "0"); add_blank_header(&resp); return send_response(p, &resp, reliable, seqno); } static int add_text(struct sip_request *req, char *text) { /* XXX Convert \n's to \r\n's XXX */ int len = strlen(text); char clen[256]; snprintf(clen, sizeof(clen), "%d", len); add_header(req, "Content-Type", "text/plain"); add_header(req, "Content-Length", clen); add_line(req, text); return 0; } static int add_digit(struct sip_request *req, char digit) { char tmp[256]; int len; char clen[256]; snprintf(tmp, sizeof(tmp), "Signal=%c\r\nDuration=250\r\n", digit); len = strlen(tmp); snprintf(clen, sizeof(clen), "%d", len); add_header(req, "Content-Type", "application/dtmf-relay"); add_header(req, "Content-Length", clen); add_line(req, tmp); return 0; } static int add_sdp(struct sip_request *resp, struct sip_pvt *p, struct ast_rtp *rtp) { int len; int codec; int alreadysent = 0; char costr[80]; struct sockaddr_in sin; struct sip_codec_pref *cur; char v[256]; char s[256]; char o[256]; char c[256]; char t[256]; char m[256]; char a[1024] = ""; int x; struct sockaddr_in dest; /* XXX We break with the "recommendation" and send our IP, in order that our peer doesn't have to gethostbyname() us XXX */ len = 0; if (!p->rtp) { ast_log(LOG_WARNING, "No way to add SDP without an RTP structure\n"); return -1; } ast_rtp_get_us(p->rtp, &sin); if (rtp) { ast_rtp_get_peer(rtp, &dest); } else { dest.sin_addr = p->ourip; dest.sin_port = sin.sin_port; } if (sipdebug) ast_verbose("We're at %s port %d\n", inet_ntoa(p->ourip), ntohs(sin.sin_port)); snprintf(v, sizeof(v), "v=0\r\n"); snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", getpid(), getpid(), inet_ntoa(dest.sin_addr)); snprintf(s, sizeof(s), "s=session\r\n"); snprintf(c, sizeof(c), "c=IN IP4 %s\r\n", inet_ntoa(dest.sin_addr)); snprintf(t, sizeof(t), "t=0 0\r\n"); snprintf(m, sizeof(m), "m=audio %d RTP/AVP", ntohs(dest.sin_port)); /* Start by sending our preferred codecs */ cur = prefs; while(cur) { if (p->capability & cur->codec) { if (sipdebug) ast_verbose("Answering with preferred capability %d\n", cur->codec); codec = ast_rtp_lookup_code(p->rtp, 1, cur->codec); if (codec > -1) { snprintf(costr, sizeof(costr), " %d", codec); strcat(m, costr); snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(1, cur->codec)); strcat(a, costr); } } alreadysent |= cur->codec; cur = cur->next; } /* Now send any other common codecs, and non-codec formats: */ for (x = 1; x <= AST_FORMAT_MAX_AUDIO; x <<= 1) { if ((p->capability & x) && !(alreadysent & x)) { if (sipdebug) ast_verbose("Answering with capability %d\n", x); codec = ast_rtp_lookup_code(p->rtp, 1, x); if (codec > -1) { snprintf(costr, sizeof(costr), " %d", codec); strcat(m, costr); snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(1, x)); strcat(a, costr); } } } for (x = 1; x <= AST_RTP_MAX; x <<= 1) { if (p->noncodeccapability & x) { if (sipdebug) ast_verbose("Answering with non-codec capability %d\n", x); codec = ast_rtp_lookup_code(p->rtp, 0, x); if (codec > -1) { snprintf(costr, sizeof(costr), " %d", codec); strcat(m, costr); snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(0, x)); strcat(a, costr); if (x == AST_RTP_DTMF) { /* Indicate we support DTMF... Not sure about 16, but MSN supports it so dang it, we will too... */ snprintf(costr, sizeof costr, "a=fmtp:%d 0-16\r\n", codec); strcat(a, costr); } } } } strcat(m, "\r\n"); len = strlen(v) + strlen(s) + strlen(o) + strlen(c) + strlen(t) + strlen(m) + strlen(a); snprintf(costr, sizeof(costr), "%d", len); add_header(resp, "Content-Type", "application/sdp"); add_header(resp, "Content-Length", costr); add_line(resp, v); add_line(resp, o); add_line(resp, s); add_line(resp, c); add_line(resp, t); add_line(resp, m); add_line(resp, a); return 0; } static void copy_request(struct sip_request *dst,struct sip_request *src) { long offset; int x; offset = ((void *)dst) - ((void *)src); /* First copy stuff */ memcpy(dst, src, sizeof(*dst)); /* Now fix pointer arithmetic */ for (x=0;xheaders;x++) dst->header[x] += offset; for (x=0;xlines;x++) dst->line[x] += offset; } static int transmit_response_with_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans) { struct sip_request resp; int seqno; if (sscanf(get_header(req, "CSeq"), "%i ", &seqno) != 1) { ast_log(LOG_WARNING, "Unable to get seqno from '%s'\n", get_header(req, "CSeq")); return -1; } respprep(&resp, p, msg, req); add_sdp(&resp, p, NULL); return send_response(p, &resp, retrans, seqno); } static int transmit_reinvite_with_sdp(struct sip_pvt *p, struct ast_rtp *rtp) { struct sip_request req; if (p->canreinvite == REINVITE_UPDATE) reqprep(&req, p, "UPDATE", 0); else reqprep(&req, p, "INVITE", 0); add_sdp(&req, p, rtp); /* Use this as the basis */ copy_request(&p->initreq, &req); parse(&p->initreq); p->lastinvite = p->ocseq; p->outgoing = 1; return send_request(p, &req, 1, p->ocseq); } static void build_contact(struct sip_pvt *p) { /* Construct Contact: header */ if (ourport != 5060) snprintf(p->our_contact, sizeof(p->our_contact), "", p->exten, inet_ntoa(p->ourip), ourport); else snprintf(p->our_contact, sizeof(p->our_contact), "", p->exten, inet_ntoa(p->ourip)); } static void initreqprep(struct sip_request *req, struct sip_pvt *p, char *cmd, char *vxml_url) { char invite[256]; char from[256]; char to[256]; char tmp[80]; char cid[256]; char *l = callerid, *n=NULL; if (p->owner && p->owner->callerid) { strcpy(cid, p->owner->callerid); ast_callerid_parse(cid, &n, &l); if (l) ast_shrink_phone_number(l); if (!l || !ast_isphonenumber(l)) l = callerid; } if (!n || !strlen(n)) n = l; /* Allow user to be overridden */ if (strlen(p->fromuser)) l = p->fromuser; if ((ourport != 5060) && !strlen(p->fromdomain)) snprintf(from, sizeof(from), "\"%s\" ;tag=as%08x", n, l, strlen(p->fromdomain) ? p->fromdomain : inet_ntoa(p->ourip), ourport, p->tag); else snprintf(from, sizeof(from), "\"%s\" ;tag=as%08x", n, l, strlen(p->fromdomain) ? p->fromdomain : inet_ntoa(p->ourip), p->tag); if (strlen(p->username)) { if (ntohs(p->sa.sin_port) != DEFAULT_SIP_PORT) { snprintf(invite, sizeof(invite), "sip:%s@%s:%d",p->username, inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port)); } else { snprintf(invite, sizeof(invite), "sip:%s@%s",p->username, inet_ntoa(p->sa.sin_addr)); } } else if (ntohs(p->sa.sin_port) != DEFAULT_SIP_PORT) { snprintf(invite, sizeof(invite), "sip:%s:%d", inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port)); } else { snprintf(invite, sizeof(invite), "sip:%s", inet_ntoa(p->sa.sin_addr)); } /* If there is a VXML URL append it to the SIP URL */ if (vxml_url) { snprintf(to, sizeof(to), "<%s>;%s", invite, vxml_url); } else { snprintf(to, sizeof(to), "<%s>", invite ); } memset(req, 0, sizeof(struct sip_request)); init_req(req, cmd, invite); snprintf(tmp, sizeof(tmp), "%d %s", ++p->ocseq, cmd); add_header(req, "Via", p->via); /* SLD: FIXME?: do Route: here too? I think not cos this is the first request. * OTOH, then we won't have anything in p->route anyway */ add_header(req, "From", from); strncpy(p->exten, l, sizeof(p->exten) - 1); build_contact(p); add_header(req, "To", to); add_header(req, "Contact", p->our_contact); add_header(req, "Call-ID", p->callid); add_header(req, "CSeq", tmp); add_header(req, "User-Agent", "Asterisk PBX"); } static int transmit_invite(struct sip_pvt *p, char *cmd, int sdp, char *auth, char *vxml_url) { struct sip_request req; initreqprep(&req, p, cmd, vxml_url); if (auth) add_header(&req, "Proxy-Authorization", auth); if (sdp) { add_sdp(&req, p, NULL); } else { add_header(&req, "Content-Length", "0"); add_blank_header(&req); } if (!p->initreq.headers) { /* Use this as the basis */ copy_request(&p->initreq, &req); parse(&p->initreq); } p->lastinvite = p->ocseq; return send_request(p, &req, 1, p->ocseq); } static int transmit_state_notify(struct sip_pvt *p, int state, int full) { char tmp[2000]; char from[256], to[256]; char *t, *c, *a; char *mfrom, *mto; struct sip_request req; char clen[20]; strncpy(from, get_header(&p->initreq, "From"), sizeof(from)-1); c = ditch_braces(from); if (strncmp(c, "sip:", 4)) { ast_log(LOG_WARNING, "Huh? Not a SIP header (%s)?\n", c); return -1; } if ((a = strchr(c, ';'))) { *a = '\0'; } mfrom = c; reqprep(&req, p, "NOTIFY", 0); if (p->subscribed == 1) { strncpy(to, get_header(&p->initreq, "To"), sizeof(to)-1); c = ditch_braces(to); if (strncmp(c, "sip:", 4)) { ast_log(LOG_WARNING, "Huh? Not a SIP header (%s)?\n", c); return -1; } if ((a = strchr(c, ';'))) { *a = '\0'; } mto = c; add_header(&req, "Content-Type", "application/xpidf+xml"); if ((state==AST_EXTENSION_UNAVAILABLE) || (state==AST_EXTENSION_BUSY)) state = 2; else if (state==AST_EXTENSION_INUSE) state = 1; else state = 0; t = tmp; sprintf(t, "\n"); t = tmp + strlen(tmp); sprintf(t, "\n"); t = tmp + strlen(tmp); sprintf(t, "\n"); t = tmp + strlen(tmp); sprintf(t, "\n", mfrom); t = tmp + strlen(tmp); sprintf(t, "\n", p->exten); t = tmp + strlen(tmp); sprintf(t, "
\n", mto); t = tmp + strlen(tmp); sprintf(t, "\n", !state ? "open" : (state==1) ? "inuse" : "closed"); t = tmp + strlen(tmp); sprintf(t, "\n", !state ? "online" : (state==1) ? "onthephone" : "offline"); t = tmp + strlen(tmp); sprintf(t, "
\n\n\n"); } else { add_header(&req, "Event", "dialog"); add_header(&req, "Content-Type", "application/dialog-info+xml"); t = tmp; sprintf(t, "\n"); t = tmp + strlen(tmp); sprintf(t, "\n", p->dialogver++, full ? "full":"partial", mfrom); t = tmp + strlen(tmp); sprintf(t, "\n", p->exten); t = tmp + strlen(tmp); sprintf(t, "%s\n", state ? "confirmed" : "terminated"); t = tmp + strlen(tmp); sprintf(t, "\n\n"); } snprintf(clen, sizeof(clen), "%d", strlen(tmp)); add_header(&req, "Content-Length", clen); add_line(&req, tmp); return send_request(p, &req, 1, p->ocseq); } static int transmit_notify(struct sip_pvt *p, int newmsgs, int oldmsgs) { struct sip_request req; char tmp[256]; char tmp2[256]; char clen[20]; initreqprep(&req, p, "NOTIFY", NULL); add_header(&req, "Event", "message-summary"); add_header(&req, "Content-Type", "application/simple-message-summary"); snprintf(tmp, sizeof(tmp), "Message-Waiting: %s\n", newmsgs ? "yes" : "no"); snprintf(tmp2, sizeof(tmp2), "Voicemail: %d/%d\n", newmsgs, oldmsgs); snprintf(clen, sizeof(clen), "%d", strlen(tmp) + strlen(tmp2)); add_header(&req, "Content-Length", clen); add_line(&req, tmp); add_line(&req, tmp2); if (!p->initreq.headers) { /* Use this as the basis */ copy_request(&p->initreq, &req); parse(&p->initreq); } return send_request(p, &req, 1, p->ocseq); } static int transmit_register(struct sip_registry *r, char *cmd, char *auth); static int sip_reregister(void *data) { /* if we are here, we know that we need to reregister. */ struct sip_registry *r=(struct sip_registry *)data; r->expire = -1; sip_do_register(r); return 0; } static int sip_do_register(struct sip_registry *r) { int res; ast_pthread_mutex_lock(&r->lock); res=transmit_register(r, "REGISTER", NULL); ast_pthread_mutex_unlock(&r->lock); return res; } static int sip_reg_timeout(void *data) { /* if we are here, our registration timed out, so we'll just do it over */ struct sip_registry *r=data; struct sip_pvt *p; int res; ast_pthread_mutex_lock(&r->lock); ast_log(LOG_NOTICE, "Registration for '%s@%s' timed out, trying again\n", r->username, inet_ntoa(r->addr.sin_addr)); if (r->call) { /* Unlink us, destroy old call. Locking is not relevent here because all this happens in the single SIP manager thread. */ p = r->call; p->registry = NULL; r->call = NULL; p->needdestroy = 1; } r->regstate=REG_STATE_UNREGISTERED; r->timeout = -1; res=transmit_register(r, "REGISTER", NULL); ast_pthread_mutex_unlock(&r->lock); return 0; } static int transmit_register(struct sip_registry *r, char *cmd, char *auth) { struct sip_request req; char from[256]; char to[256]; char tmp[80]; char via[80]; char addr[80]; struct sip_pvt *p; /* exit if we are already in process with this registrar ?*/ if ( r == NULL || ((auth==NULL) && (r->regstate==REG_STATE_REGSENT || r->regstate==REG_STATE_AUTHSENT))) { ast_log(LOG_NOTICE, "Strange, trying to register when registration already pending\n"); return 0; } if (r->call) { if (!auth) { ast_log(LOG_WARNING, "Already have a call??\n"); return 0; } else p = r->call; } else { build_callid(r->callid, sizeof(r->callid), __ourip); p=sip_alloc( r->callid, &r->addr, 0); if (!p) { ast_log(LOG_WARNING, "Unable to allocate registration call\n"); return 0; } p->outgoing = 1; r->call=p; p->registry=r; strncpy(p->peersecret, r->secret, sizeof(p->peersecret)-1); strncpy(p->peername, r->username, sizeof(p->peername)-1); strncpy(p->username, r->username, sizeof(p->username)-1); strncpy(p->exten, r->contact, sizeof(p->exten) - 1); build_contact(p); } /* set up a timeout */ if (auth==NULL) { if (r->timeout > -1) { ast_log(LOG_WARNING, "Still have a timeout, %d\n", r->timeout); ast_sched_del(sched, r->timeout); } r->timeout = ast_sched_add(sched, 10*1000, sip_reg_timeout, r); ast_log(LOG_DEBUG, "Scheduled a timeout # %d\n", r->timeout); } snprintf(from, sizeof(from), ";tag=as%08x", r->username, r->hostname, p->tag); snprintf(to, sizeof(to), ";tag=as%08x", r->username, r->hostname, p->tag); snprintf(addr, sizeof(addr), "sip:%s", inet_ntoa(r->addr.sin_addr)); memset(&req, 0, sizeof(req)); init_req(&req, cmd, addr); snprintf(tmp, sizeof(tmp), "%d %s", ++p->ocseq, cmd); snprintf(via, sizeof(via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", inet_ntoa(p->ourip), ourport, p->branch); add_header(&req, "Via", via); add_header(&req, "From", from); add_header(&req, "To", to); add_header(&req, "Call-ID", p->callid); add_header(&req, "CSeq", tmp); add_header(&req, "User-Agent", "Asterisk PBX"); if (auth) add_header(&req, "Authorization", auth); snprintf(tmp, sizeof(tmp), "%d", default_expiry); add_header(&req, "Expires", tmp); add_header(&req, "Contact", p->our_contact); add_header(&req, "Event", "registration"); add_header(&req, "Content-length", "0"); add_blank_header(&req); copy_request(&p->initreq, &req); parse(&p->initreq); r->regstate=auth?REG_STATE_AUTHSENT:REG_STATE_REGSENT; return send_request(p, &req, 1, p->ocseq); } static int transmit_message_with_text(struct sip_pvt *p, char *text) { struct sip_request req; reqprep(&req, p, "MESSAGE", 0); add_text(&req, text); return send_request(p, &req, 1, p->ocseq); } static int transmit_info_with_digit(struct sip_pvt *p, char digit) { struct sip_request req; reqprep(&req, p, "INFO", 0); add_digit(&req, digit); return send_request(p, &req, 1, p->ocseq); } static int transmit_request(struct sip_pvt *p, char *msg, int seqno, int reliable) { struct sip_request resp; reqprep(&resp, p, msg, seqno); add_header(&resp, "Content-Length", "0"); add_blank_header(&resp); return send_request(p, &resp, reliable, seqno ? seqno : p->ocseq); } static int transmit_request_with_auth(struct sip_pvt *p, char *msg, int seqno, int reliable) { struct sip_request resp; reqprep(&resp, p, msg, seqno); if (*p->realm) { char digest[256]; memset(digest,0,sizeof(digest)); build_reply_digest(p, msg, digest, sizeof(digest)); add_header(&resp, "Proxy-Authorization", digest); } add_header(&resp, "Content-Length", "0"); add_blank_header(&resp); return send_request(p, &resp, reliable, seqno ? seqno : p->ocseq); } static int expire_register(void *data) { struct sip_peer *p = data; memset(&p->addr, 0, sizeof(p->addr)); p->expire = -1; ast_device_state_changed("SIP/%s", p->name); return 0; } static int sip_poke_peer(struct sip_peer *peer); static int parse_contact(struct sip_pvt *pvt, struct sip_peer *p, struct sip_request *req) { char contact[80]= ""; char *expires = get_header(req, "Expires"); int expiry = atoi(expires); char *c, *n, *pt; int port; struct hostent *hp; struct sockaddr_in oldsin; if (!strlen(expires)) { expires = strstr(get_header(req, "Contact"), "expires="); if (expires) { if (sscanf(expires + 8, "%d;", &expiry) != 1) expiry = default_expiry; } else { /* Nothing has been specified */ expiry = default_expiry; } } /* Look for brackets */ strncpy(contact, get_header(req, "Contact"), sizeof(contact) - 1); c = contact; if ((n=strchr(c, '<'))) { c = n + 1; n = strchr(c, '>'); /* Lose the part after the > */ if (n) *n = '\0'; } if (!strcasecmp(c, "*") || !expiry) { /* This means remove all registrations and return OK */ memset(&p->addr, 0, sizeof(p->addr)); if (p->expire > -1) ast_sched_del(sched, p->expire); p->expire = -1; if (option_verbose > 2) ast_verbose(VERBOSE_PREFIX_3 "Unregistered SIP '%s'\n", p->username); return 0; } /* Make sure it's a SIP URL */ if (strncasecmp(c, "sip:", 4)) { ast_log(LOG_NOTICE, "'%s' is not a valid SIP contact (missing sip:) trying to use anyway\n", c); } else c += 4; /* Ditch q */ n = strchr(c, ';'); if (n) *n = '\0'; /* Grab host */ n = strchr(c, '@'); if (!n) { n = c; c = NULL; } else { *n = '\0'; n++; } pt = strchr(n, ':'); if (pt) { *pt = '\0'; pt++; port = atoi(pt); } else port = DEFAULT_SIP_PORT; memcpy(&oldsin, &p->addr, sizeof(oldsin)); if (!p->nat) { /* XXX This could block for a long time XXX */ hp = gethostbyname(n); if (!hp) { ast_log(LOG_WARNING, "Invalid host '%s'\n", n); return -1; } p->addr.sin_family = AF_INET; memcpy(&p->addr.sin_addr, hp->h_addr, sizeof(p->addr.sin_addr)); p->addr.sin_port = htons(port); } else { /* Don't trust the contact field. Just use what they came to us with */ memcpy(&p->addr, &pvt->recv, sizeof(p->addr)); } if (c) strncpy(p->username, c, sizeof(p->username) - 1); else strcpy(p->username, ""); if (p->expire > -1) ast_sched_del(sched, p->expire); if ((expiry < 1) || (expiry > max_expiry)) expiry = max_expiry; p->expire = ast_sched_add(sched, (expiry + 10) * 1000, expire_register, p); pvt->expiry = expiry; if (inaddrcmp(&p->addr, &oldsin)) { sip_poke_peer(p); if (option_verbose > 2) ast_verbose(VERBOSE_PREFIX_3 "Registered SIP '%s' at %s port %d expires %d\n", p->username, inet_ntoa(p->addr.sin_addr), ntohs(p->addr.sin_port), expiry); } return 0; } static void free_old_route(struct sip_route *route) { struct sip_route *next; while (route) { next = route->next; free(route); route = next; } } static void list_route(struct sip_route *route) { if (!route) { ast_verbose("list_route: no route\n"); return; } while (route) { ast_verbose("list_route: hop: <%s>\n", route->hop); route = route->next; } } static void build_route(struct sip_pvt *p, struct sip_request *req, int backwards) { struct sip_route *thishop, *head, *tail; int start = 0; int len; char *rr, *contact, *c; if (p->route) { free_old_route(p->route); p->route = NULL; } /* We build up head, then assign it to p->route when we're done */ head = NULL; tail = head; /* 1st we pass through all the hops in any Record-Route headers */ for (;;) { /* Each Record-Route header */ rr = __get_header(req, "Record-Route", &start); if (*rr == '\0') break; for (;;) { /* Each route entry */ /* Find < */ rr = strchr(rr, '<'); if (!rr) break; /* No more hops */ ++rr; len = strcspn(rr, ">"); /* Make a struct route */ thishop = (struct sip_route *)malloc(sizeof(struct sip_route)+len+1); if (thishop) { strncpy(thishop->hop, rr, len); thishop->hop[len] = '\0'; ast_log(LOG_DEBUG, "build_route: Record-Route hop: <%s>\n", thishop->hop); /* Link in */ if (backwards) { /* Link in at head so they end up in reverse order */ thishop->next = head; head = thishop; /* If this was the first then it'll be the tail */ if (!tail) tail = thishop; } else { thishop->next = NULL; /* Link in at the end */ if (tail) tail->next = thishop; else head = thishop; tail = thishop; } } rr += len+1; } } /* 2nd append the Contact: if there is one */ /* Can be multiple Contact headers, comma separated values - we just take the first */ contact = get_header(req, "Contact"); if (strlen(contact)) { ast_log(LOG_DEBUG, "build_route: Contact hop: %s\n", contact); /* Look for <: delimited address */ c = strchr(contact, '<'); if (c) { /* Take to > */ ++c; len = strcspn(c, ">"); } else { /* No <> - just take the lot */ c = contact; len = strlen(contact); } thishop = (struct sip_route *)malloc(sizeof(struct sip_route)+len+1); if (thishop) { strncpy(thishop->hop, c, len); thishop->hop[len] = '\0'; thishop->next = NULL; /* Goes at the end */ if (tail) tail->next = thishop; else head = thishop; } } /* Store as new route */ p->route = head; /* For debugging dump what we ended up with */ if (sipdebug) list_route(p->route); } static void md5_hash(char *output, char *input) { struct MD5Context md5; unsigned char digest[16]; char *ptr; int x; MD5Init(&md5); MD5Update(&md5, input, strlen(input)); MD5Final(digest, &md5); ptr = output; for (x=0;x<16;x++) ptr += sprintf(ptr, "%2.2x", digest[x]); } static int check_auth(struct sip_pvt *p, struct sip_request *req, char *randdata, int randlen, char *username, char *secret, char *method, char *uri, int reliable) { int res = -1; /* Always OK if no secret */ if (!strlen(secret)) return 0; if (!strlen(randdata) || !strlen(get_header(req, "Proxy-Authorization"))) { snprintf(randdata, randlen, "%08x", rand()); transmit_response_with_auth(p, "407 Proxy Authentication Required", req, randdata, reliable); /* Schedule auto destroy in 15 seconds */ sip_scheddestroy(p, 15000); res = 1; } else { /* Whoever came up with the authentication section of SIP can suck my %&#$&* for not putting an example in the spec of just what it is you're doing a hash on. */ char a1[256]; char a2[256]; char a1_hash[256]; char a2_hash[256]; char resp[256]; char resp_hash[256]; char tmp[256] = ""; char *c; char *response =""; char *resp_uri =""; /* Find their response among the mess that we'r sent for comparison */ strncpy(tmp, get_header(req, "Proxy-Authorization"), sizeof(tmp) - 1); c = tmp; while(c) { while (*c && (*c < 33)) c++; if (!*c) break; if (!strncasecmp(c, "response=", strlen("response="))) { c+= strlen("response="); if ((*c == '\"')) { response=++c; if((c = strchr(c,'\"'))) *c = '\0'; } else { response=c; if((c = strchr(c,','))) *c = '\0'; } } else if (!strncasecmp(c, "uri=", strlen("uri="))) { c+= strlen("uri="); if ((*c == '\"')) { resp_uri=++c; if((c = strchr(c,'\"'))) *c = '\0'; } else { resp_uri=c; if((c = strchr(c,','))) *c = '\0'; } } else c = strchr(c, ','); if (c) c++; } snprintf(a1, sizeof(a1), "%s:%s:%s", username, "asterisk", secret); if(strlen(resp_uri)) snprintf(a2, sizeof(a2), "%s:%s", method, resp_uri); else snprintf(a2, sizeof(a2), "%s:%s", method, uri); md5_hash(a1_hash, a1); md5_hash(a2_hash, a2); snprintf(resp, sizeof(resp), "%s:%s:%s", a1_hash, randdata, a2_hash); md5_hash(resp_hash, resp); /* resp_hash now has the expected response, compare the two */ if (response && !strncasecmp(response, resp_hash, strlen(resp_hash))) { /* Auth is OK */ res = 0; } /* Assume success ;-) */ /* Eliminate random data */ strcpy(randdata, ""); } return res; } static int cb_extensionstate(char *context, char* exten, int state, void *data) { struct sip_pvt *p = data; if (state == -1) { sip_scheddestroy(p, 15000); p->stateid = -1; return 0; } transmit_state_notify(p, state, 1); if (option_debug) ast_verbose(VERBOSE_PREFIX_1 "Extension Changed %s new state %d for Notify User %s\n", exten, state, p->username); return 0; } static int register_verify(struct sip_pvt *p, struct sockaddr_in *sin, struct sip_request *req, char *uri) { int res = -1; struct sip_peer *peer; char tmp[256] = ""; char *name, *c; char *t; /* Terminate URI */ t = uri; while(*t && (*t > 32) && (*t != ';')) t++; *t = '\0'; strncpy(tmp, get_header(req, "To"), sizeof(tmp) - 1); c = ditch_braces(tmp); /* Ditch ;user=phone */ name = strchr(c, ';'); if (name) *name = '\0'; if (!strncmp(c, "sip:", 4)) { name = c + 4; } else { name = c; ast_log(LOG_NOTICE, "Invalid to address: '%s' from %s (missing sip:) trying to use anyway...\n", c, inet_ntoa(sin->sin_addr)); } c = strchr(name, '@'); if (c) *c = '\0'; strncpy(p->exten, name, sizeof(p->exten) - 1); build_contact(p); ast_pthread_mutex_lock(&peerl.lock); peer = peerl.peers; while(peer) { if (!strcasecmp(peer->name, name) && peer->dynamic) { p->nat = peer->nat; transmit_response(p, "100 Trying", req); if (!(res = check_auth(p, req, p->randdata, sizeof(p->randdata), peer->name, peer->secret, "REGISTER", uri, 0))) { sip_cancel_destroy(p); if (parse_contact(p, peer, req)) { ast_log(LOG_WARNING, "Failed to parse contact info\n"); } else { /* Say OK and ask subsystem to retransmit msg counter */ transmit_response_with_date(p, "200 OK", req); peer->lastmsgssent = -1; res = 0; } } break; } peer = peer->next; } ast_pthread_mutex_unlock(&peerl.lock); if (!res) { ast_device_state_changed("SIP/%s", peer->name); } if (res < 0) transmit_response(p, "401 Unauthorized", &p->initreq); return res; } static int get_destination(struct sip_pvt *p, struct sip_request *oreq) { char tmp[256] = "", *c, *a; struct sip_request *req; req = oreq; if (!req) req = &p->initreq; strncpy(tmp, req->rlPart2, sizeof(tmp) - 1); c = ditch_braces(tmp); if (strncmp(c, "sip:", 4)) { ast_log(LOG_WARNING, "Huh? Not a SIP header (%s)?\n", c); return -1; } c += 4; if ((a = strchr(c, '@')) || (a = strchr(c, ';'))) { *a = '\0'; } if (sipdebug) ast_verbose("Looking for %s in %s\n", c, p->context); if (ast_exists_extension(NULL, p->context, c, 1, NULL) || !strcmp(c, ast_pickup_ext())) { if (!oreq) strncpy(p->exten, c, sizeof(p->exten) - 1); return 0; } if (ast_canmatch_extension(NULL, p->context, c, 1, NULL) || !strncmp(c, ast_pickup_ext(),strlen(c))) { return 1; } return -1; } static int get_refer_info(struct sip_pvt *p, struct sip_request *oreq) { char tmp[256] = "", *c, *a; char tmp2[256] = "", *c2, *a2; char tmp3[256]; char tmp4[256]; char tmp5[256] = ""; /* CallID to replace */ struct sip_request *req; struct sip_pvt *p2; req = oreq; if (!req) req = &p->initreq; strncpy(tmp, get_header(req, "Refer-To"), sizeof(tmp) - 1); strncpy(tmp2, get_header(req, "Referred-By"), sizeof(tmp2) - 1); strncpy(tmp3, get_header(req, "Contact"), sizeof(tmp3) - 1); strncpy(tmp4, get_header(req, "Remote-Party-ID"), sizeof(tmp4) - 1); c = ditch_braces(tmp); c2 = ditch_braces(tmp2); if (strncmp(c, "sip:", 4) && strncmp(c2, "sip:", 4)) { ast_log(LOG_WARNING, "Huh? Not a SIP header (%s)?\n", c); ast_log(LOG_WARNING, "Huh? Not a SIP header (%s)?\n", c2); return -1; } c += 4; c2 += 4; if ((a = strchr(c, '?'))) { /* Search for arguemnts */ *a = '\0'; a++; if (!strncasecmp(a, "REPLACES=", strlen("REPLACES="))) { strncpy(tmp5, a + strlen("REPLACES="), sizeof(tmp5) - 1); if ((a = strchr(tmp5, '%'))) { /* Yuck! Pingtel converts the '@' to a %40, icky icky! Convert back to an '@' */ if ((a[1] == '4') && (a[2] == '0')) { *a = '@'; memmove(a + 1, a+3, strlen(a + 3)); } } if ((a = strchr(tmp5, '%'))) *a = '\0'; } } if ((a = strchr(c, '@'))) *a = '\0'; if ((a = strchr(c, ';'))) *a = '\0'; if ((a2 = strchr(c2, '@'))) *a2 = '\0'; if ((a2 = strchr(c2, ';'))) *a2 = '\0'; if (sipdebug) { ast_verbose("Looking for %s in %s\n", c, p->context); ast_verbose("Looking for %s in %s\n", c2, p->context); } if (strlen(tmp5)) { /* This is a supervised transfer */ ast_log(LOG_DEBUG,"Assigning Replace-Call-ID Info %s to REPLACE_CALL_ID\n",tmp5); strncpy(p->refer_to, "", sizeof(p->refer_to) - 1); strncpy(p->referred_by, "", sizeof(p->referred_by) - 1); strncpy(p->refer_contact, "", sizeof(p->refer_contact) - 1); strncpy(p->remote_party_id, "", sizeof(p->remote_party_id) - 1); p->refer_call = NULL; ast_pthread_mutex_lock(&iflock); /* Search interfaces and find the match */ p2 = iflist; while(p2) { if (!strcmp(p2->callid, tmp5)) { /* Go ahead and lock it before returning */ ast_pthread_mutex_lock(&p2->lock); p->refer_call = p2; break; } p2 = p2->next; } ast_pthread_mutex_unlock(&iflock); if (p->refer_call) return 0; else ast_log(LOG_NOTICE, "Supervised transfer requested, but unable to find callid '%s'\n", tmp5); } else if (ast_exists_extension(NULL, p->context, c, 1, NULL)) { /* This is an unsupervised transfer */ ast_log(LOG_DEBUG,"Assigning Extension %s to REFER-TO\n", c); ast_log(LOG_DEBUG,"Assigning Extension %s to REFERRED-BY\n", c2); ast_log(LOG_DEBUG,"Assigning Contact Info %s to REFER_CONTACT\n", tmp3); ast_log(LOG_DEBUG,"Assigning Remote-Party-ID Info %s to REMOTE_PARTY_ID\n",tmp4); strncpy(p->refer_to, c, sizeof(p->refer_to) - 1); strncpy(p->referred_by, c2, sizeof(p->referred_by) - 1); strncpy(p->refer_contact, tmp3, sizeof(p->refer_contact) - 1); strncpy(p->remote_party_id, tmp4, sizeof(p->remote_party_id) - 1); p->refer_call = NULL; return 0; } else if (ast_canmatch_extension(NULL, p->context, c, 1, NULL)) { return 1; } return -1; } static int check_via(struct sip_pvt *p, struct sip_request *req) { char via[256] = ""; char *c, *pt; struct hostent *hp; memset(via, 0, sizeof(via)); strncpy(via, get_header(req, "Via"), sizeof(via) - 1); c = strchr(via, ';'); if (c) *c = '\0'; c = strchr(via, ' '); if (c) { *c = '\0'; c++; while(*c && (*c < 33)) c++; if (strcmp(via, "SIP/2.0/UDP")) { ast_log(LOG_WARNING, "Don't know how to respond via '%s'\n", via); return -1; } pt = strchr(c, ':'); if (pt) { *pt = '\0'; pt++; } hp = gethostbyname(c); if (!hp) { ast_log(LOG_WARNING, "'%s' is not a valid host\n", c); return -1; } memset(&p->sa, 0, sizeof(p->sa)); p->sa.sin_family = AF_INET; memcpy(&p->sa.sin_addr, hp->h_addr, sizeof(p->sa.sin_addr)); p->sa.sin_port = htons(pt ? atoi(pt) : DEFAULT_SIP_PORT); if (sipdebug) { if (p->nat) ast_verbose("Sending to %s : %d (NAT)\n", inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port)); else ast_verbose("Sending to %s : %d (non-NAT)\n", inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port)); } } return 0; } static int check_user(struct sip_pvt *p, struct sip_request *req, char *cmd, char *uri, int reliable) { struct sip_user *user; struct sip_peer *peer; char *of, from[256] = "", *c; int res = 0; char *t; /* Terminate URI */ t = uri; while(*t && (*t > 32) && (*t != ';')) t++; *t = '\0'; of = get_header(req, "From"); strncpy(from, of, sizeof(from) - 1); of = ditch_braces(from); if (strncmp(of, "sip:", 4)) { ast_log(LOG_NOTICE, "From address missing 'sip:', using it anyway\n"); } else of += 4; /* Get just the username part */ if ((c = strchr(of, '@'))) *c = '\0'; if ((c = strchr(of, ':'))) *c = '\0'; strncpy(p->callerid, of, sizeof(p->callerid) - 1); if (!strlen(of)) return 0; ast_pthread_mutex_lock(&userl.lock); user = userl.users; while(user) { if (!strcasecmp(user->name, of)) { p->nat = user->nat; if (p->rtp) { ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", p->nat); ast_rtp_setnat(p->rtp, p->nat); } if (!(res = check_auth(p, req, p->randdata, sizeof(p->randdata), user->name, user->secret, cmd, uri, reliable))) { sip_cancel_destroy(p); if (strlen(user->context)) strncpy(p->context, user->context, sizeof(p->context) - 1); if (strlen(user->callerid) && strlen(p->callerid)) strncpy(p->callerid, user->callerid, sizeof(p->callerid) - 1); strncpy(p->username, user->name, sizeof(p->username) - 1); strncpy(p->accountcode, user->accountcode, sizeof(p->accountcode) -1); p->canreinvite = user->canreinvite; p->amaflags = user->amaflags; p->callgroup = user->callgroup; p->pickupgroup = user->pickupgroup; if (user->dtmfmode) { p->dtmfmode = user->dtmfmode; if (p->dtmfmode & SIP_DTMF_RFC2833) p->noncodeccapability |= AST_RTP_DTMF; else p->noncodeccapability &= ~AST_RTP_DTMF; } } break; } user = user->next; } ast_pthread_mutex_unlock(&userl.lock); if (!user) { /* If we didn't find a user match, check for peers */ ast_pthread_mutex_lock(&peerl.lock); peer = peerl.peers; while(peer) { if (!inaddrcmp(&peer->addr, &p->recv)) { /* Take the peer */ p->nat = peer->nat; if (p->rtp) { ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", p->nat); ast_rtp_setnat(p->rtp, p->nat); } p->canreinvite = peer->canreinvite; strncpy(p->username, peer->name, sizeof(p->username) - 1); if (strlen(peer->context)) strncpy(p->context, peer->context, sizeof(p->context) - 1); p->callgroup = peer->callgroup; p->pickupgroup = peer->pickupgroup; if (peer->dtmfmode) { p->dtmfmode = peer->dtmfmode; if (p->dtmfmode & SIP_DTMF_RFC2833) p->noncodeccapability |= AST_RTP_DTMF; else p->noncodeccapability &= ~AST_RTP_DTMF; } break; } peer = peer->next; } ast_pthread_mutex_unlock(&peerl.lock); } return res; } static int get_msg_text(char *buf, int len, struct sip_request *req) { int x; strcpy(buf, ""); for (x=0;xlines;x++) { strncat(buf, req->line[x], len - strlen(buf) - 5); strcat(buf, "\n"); } return 0; } static void receive_message(struct sip_pvt *p, struct sip_request *req) { char buf[1024]; struct ast_frame f; if (get_msg_text(buf, sizeof(buf), req)) { ast_log(LOG_WARNING, "Unable to retrieve text from %s\n", p->callid); return; } if (p->owner) { if (sipdebug) ast_verbose("Message received: '%s'\n", buf); memset(&f, 0, sizeof(f)); f.frametype = AST_FRAME_TEXT; f.subclass = 0; f.offset = 0; f.data = buf; f.datalen = strlen(buf); ast_queue_frame(p->owner, &f, 0); } } static int sip_show_users(int fd, int argc, char *argv[]) { #define FORMAT "%-15.15s %-15.15s %-15.15s %-15.15s %-5.5s\n" struct sip_user *user; if (argc != 3) return RESULT_SHOWUSAGE; ast_pthread_mutex_lock(&userl.lock); ast_cli(fd, FORMAT, "Username", "Secret", "Authen", "Def.Context", "A/C"); for(user=userl.users;user;user=user->next) { ast_cli(fd, FORMAT, user->name, user->secret, user->methods, user->context, user->ha ? "Yes" : "No"); } ast_pthread_mutex_unlock(&userl.lock); return RESULT_SUCCESS; #undef FORMAT } static int sip_show_peers(int fd, int argc, char *argv[]) { #define FORMAT2 "%-15.15s %-15.15s %s %-15.15s %-8s %-10s\n" #define FORMAT "%-15.15s %-15.15s %s %-15.15s %-8d %-10s\n" struct sip_peer *peer; char name[256] = ""; if (argc != 3) return RESULT_SHOWUSAGE; ast_pthread_mutex_lock(&peerl.lock); ast_cli(fd, FORMAT2, "Name/username", "Host", " ", "Mask", "Port", "Status"); for (peer = peerl.peers;peer;peer = peer->next) { char nm[20] = ""; char status[20]; strncpy(nm, inet_ntoa(peer->mask), sizeof(nm)-1); if (strlen(peer->username)) snprintf(name, sizeof(name), "%s/%s", peer->name, peer->username); else strncpy(name, peer->name, sizeof(name) - 1); if (peer->maxms) { if (peer->lastms < 0) strcpy(status, "UNREACHABLE"); else if (peer->lastms > peer->maxms) snprintf(status, sizeof(status), "LAGGED (%d ms)", peer->lastms); else if (peer->lastms) snprintf(status, sizeof(status), "OK (%d ms)", peer->lastms); else strcpy(status, "UNKNOWN"); } else strcpy(status, "Unmonitored"); ast_cli(fd, FORMAT, name, peer->addr.sin_addr.s_addr ? inet_ntoa(peer->addr.sin_addr) : "(Unspecified)", peer->dynamic ? "(D)" : " ", nm, ntohs(peer->addr.sin_port), status); } ast_pthread_mutex_unlock(&peerl.lock); return RESULT_SUCCESS; #undef FORMAT #undef FORMAT2 } static char *regstate2str(int regstate) { switch(regstate) { case REG_STATE_UNREGISTERED: return "Unregistered"; case REG_STATE_REGSENT: return "Request Sent"; case REG_STATE_AUTHSENT: return "Auth. Sent"; case REG_STATE_REGISTERED: return "Registered"; case REG_STATE_REJECTED: return "Rejected"; case REG_STATE_TIMEOUT: return "Timeout"; case REG_STATE_NOAUTH: return "No Authentication"; default: return "Unknown"; } } static int sip_show_registry(int fd, int argc, char *argv[]) { #define FORMAT2 "%-20.20s %-10.10s %8.8s %-20.20s\n" #define FORMAT "%-20.20s %-10.10s %8d %-20.20s\n" struct sip_registry *reg; char host[80]; if (argc != 3) return RESULT_SHOWUSAGE; ast_pthread_mutex_lock(&peerl.lock); ast_cli(fd, FORMAT2, "Host", "Username", "Refresh", "State"); for (reg = registrations;reg;reg = reg->next) { snprintf(host, sizeof(host), "%s:%d", inet_ntoa(reg->addr.sin_addr), ntohs(reg->addr.sin_port)); ast_cli(fd, FORMAT, host, reg->username, reg->refresh, regstate2str(reg->regstate)); } ast_pthread_mutex_unlock(&peerl.lock); return RESULT_SUCCESS; #undef FORMAT #undef FORMAT2 } static int sip_show_channels(int fd, int argc, char *argv[]) { #define FORMAT2 "%-15.15s %-10.10s %-11.11s %-11.11s %-7.7s %-6.6s %s\n" #define FORMAT "%-15.15s %-10.10s %-11.11s %5.5d/%5.5d %-5.5dms %-4.4dms %d\n" struct sip_pvt *cur; int numchans = 0; if (argc != 3) return RESULT_SHOWUSAGE; ast_pthread_mutex_lock(&iflock); cur = iflist; ast_cli(fd, FORMAT2, "Peer", "Username", "Call ID", "Seq (Tx/Rx)", "Lag", "Jitter", "Format"); while (cur) { if (!cur->subscribed) { ast_cli(fd, FORMAT, inet_ntoa(cur->sa.sin_addr), strlen(cur->username) ? cur->username : "(None)", cur->callid, cur->ocseq, cur->icseq, 0, 0, cur->owner ? cur->owner->nativeformats : 0); numchans++; } cur = cur->next; } ast_pthread_mutex_unlock(&iflock); ast_cli(fd, "%d active SIP channel(s)\n", numchans); return RESULT_SUCCESS; #undef FORMAT #undef FORMAT2 } static char *complete_sipch(char *line, char *word, int pos, int state) { int which=0; struct sip_pvt *cur; char *c = NULL; ast_pthread_mutex_lock(&iflock); cur = iflist; while(cur) { if (!strncasecmp(word, cur->callid, strlen(word))) { if (++which > state) { c = strdup(cur->callid); break; } } cur = cur->next; } ast_pthread_mutex_unlock(&iflock); return c; } static int sip_show_channel(int fd, int argc, char *argv[]) { struct sip_pvt *cur; char tmp[256]; if (argc != 4) return RESULT_SHOWUSAGE; ast_pthread_mutex_lock(&iflock); cur = iflist; while(cur) { if (!strcasecmp(cur->callid, argv[3])) { ast_cli(fd, "Call-ID: %s\n", cur->callid); ast_cli(fd, "Codec Capability: %d\n", cur->capability); ast_cli(fd, "Non-Codec Capability: %d\n", cur->noncodeccapability); ast_cli(fd, "Theoretical Address: %s:%d\n", inet_ntoa(cur->sa.sin_addr), ntohs(cur->sa.sin_port)); ast_cli(fd, "Received Address: %s:%d\n", inet_ntoa(cur->recv.sin_addr), ntohs(cur->recv.sin_port)); ast_cli(fd, "NAT Support: %s\n", cur->nat ? "Yes" : "No"); ast_cli(fd, "Our Tag: %08d\n", cur->tag); ast_cli(fd, "Their Tag: %s\n", cur->theirtag); strcpy(tmp, ""); if (cur->dtmfmode & SIP_DTMF_RFC2833) strcat(tmp, "rfc2833 "); if (cur->dtmfmode & SIP_DTMF_INFO) strcat(tmp, "info "); if (cur->dtmfmode & SIP_DTMF_INBAND) strcat(tmp, "inband "); ast_cli(fd, "DTMF Mode: %s\n", tmp); break; } cur = cur->next; } ast_pthread_mutex_unlock(&iflock); if (!cur) ast_cli(fd, "No such SIP Call ID '%s'\n", argv[3]); return RESULT_SUCCESS; } static void receive_info(struct sip_pvt *p, struct sip_request *req) { char buf[1024] = ""; struct ast_frame f; char *c; /* Try getting the "signal=" part */ if ((c = get_sdp(req, "Signal"))) { strncpy(buf, c, sizeof(buf) - 1); } else if (get_msg_text(buf, sizeof(buf), req)) { /* Normal INFO method */ ast_log(LOG_WARNING, "Unable to retrieve text from %s\n", p->callid); return; } if (p->owner) { if (strlen(buf)) { if (sipdebug) ast_verbose("DTMF received: '%c'\n", buf[0]); memset(&f, 0, sizeof(f)); f.frametype = AST_FRAME_DTMF; f.subclass = buf[0]; f.offset = 0; f.data = NULL; f.datalen = 0; ast_queue_frame(p->owner, &f, 0); } } } static int sip_do_debug(int fd, int argc, char *argv[]) { if (argc != 2) return RESULT_SHOWUSAGE; sipdebug = 1; ast_cli(fd, "SIP Debugging Enabled\n"); return RESULT_SUCCESS; } static int sip_no_debug(int fd, int argc, char *argv[]) { if (argc != 3) return RESULT_SHOWUSAGE; sipdebug = 0; ast_cli(fd, "SIP Debugging Disabled\n"); return RESULT_SUCCESS; } static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, char *orig_header, char *digest, int digest_len); static int do_register_auth(struct sip_pvt *p, struct sip_request *req) { char digest[256]; memset(digest,0,sizeof(digest)); if (reply_digest(p,req, "WWW-Authenticate", "REGISTER", digest, sizeof(digest))) { /* There's nothing to use for authentication */ return -1; } return transmit_register(p->registry,"REGISTER",digest); } static int do_proxy_auth(struct sip_pvt *p, struct sip_request *req) { char digest[256]; memset(digest,0,sizeof(digest)); if (reply_digest(p,req, "Proxy-Authenticate", "INVITE", digest, sizeof(digest) )) { /* No way to authenticate */ return -1; } return transmit_invite(p,"INVITE",1,digest, NULL); } static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, char *orig_header, char *digest, int digest_len) { char tmp[256] = ""; char *realm = ""; char *nonce = ""; char *c; strncpy(tmp, get_header(req, header),sizeof(tmp) - 1); if (!strlen(tmp)) return -1; c = tmp; c+=strlen("Digest "); while (c) { while (*c && (*c < 33)) c++; if (!*c) break; if (!strncasecmp(c,"realm=", strlen("realm="))) { c+=strlen("realm="); if ((*c == '\"')) { realm=++c; if ((c = strchr(c,'\"'))) *c = '\0'; } else { realm = c; if ((c = strchr(c,','))) *c = '\0'; } } else if (!strncasecmp(c, "nonce=", strlen("nonce="))) { c+=strlen("nonce="); if ((*c == '\"')) { nonce=++c; if ((c = strchr(c,'\"'))) *c = '\0'; } else { nonce = c; if ((c = strchr(c,','))) *c = '\0'; } } else c = strchr(c,','); if (c) c++; } /* copy realm and nonce for later authorization of CANCELs and BYEs */ strncpy(p->realm, realm, sizeof(p->realm)-1); strncpy(p->nonce, nonce, sizeof(p->nonce)-1); build_reply_digest(p, orig_header, digest, digest_len); return 0; } static int build_reply_digest(struct sip_pvt *p, char* orig_header, char* digest, int digest_len) { char a1[256]; char a2[256]; char a1_hash[256]; char a2_hash[256]; char resp[256]; char resp_hash[256]; char uri[256] = ""; snprintf(uri, sizeof(uri), "sip:%s@%s",p->username, inet_ntoa(p->sa.sin_addr)); snprintf(a1,sizeof(a1),"%s:%s:%s",p->peername,p->realm,p->peersecret); snprintf(a2,sizeof(a2),"%s:%s",orig_header,uri); md5_hash(a1_hash,a1); md5_hash(a2_hash,a2); snprintf(resp,sizeof(resp),"%s:%s:%s",a1_hash,p->nonce,a2_hash); md5_hash(resp_hash,resp); snprintf(digest,digest_len,"Digest username=\"%s\", realm=\"%s\", algorithm=\"MD5\", uri=\"%s\", nonce=\"%s\", response=\"%s\"",p->peername,p->realm,uri,p->nonce,resp_hash); return 0; } static char show_users_usage[] = "Usage: sip show users\n" " Lists all users known to the SIP (Session Initiation Protocol) subsystem.\n"; static char show_channels_usage[] = "Usage: sip show channels\n" " Lists all currently active SIP channels.\n"; static char show_channel_usage[] = "Usage: sip show channel \n" " Provides detailed status on a given SIP channel.\n"; static char show_peers_usage[] = "Usage: sip show peers\n" " Lists all known SIP peers.\n"; static char show_reg_usage[] = "Usage: sip show registry\n" " Lists all registration requests and status.\n"; static char debug_usage[] = "Usage: sip debug\n" " Enables dumping of SIP packets for debugging purposes\n"; static char no_debug_usage[] = "Usage: sip no debug\n" " Disables dumping of SIP packets for debugging purposes\n"; static struct ast_cli_entry cli_show_users = { { "sip", "show", "users", NULL }, sip_show_users, "Show defined SIP users", show_users_usage }; static struct ast_cli_entry cli_show_channels = { { "sip", "show", "channels", NULL }, sip_show_channels, "Show active SIP channels", show_channels_usage}; static struct ast_cli_entry cli_show_channel = { { "sip", "show", "channel", NULL }, sip_show_channel, "Show detailed SIP channel info", show_channel_usage, complete_sipch }; static struct ast_cli_entry cli_show_peers = { { "sip", "show", "peers", NULL }, sip_show_peers, "Show defined SIP peers", show_peers_usage }; static struct ast_cli_entry cli_show_registry = { { "sip", "show", "registry", NULL }, sip_show_registry, "Show SIP registration status", show_reg_usage }; static struct ast_cli_entry cli_debug = { { "sip", "debug", NULL }, sip_do_debug, "Enable SIP debugging", debug_usage }; static struct ast_cli_entry cli_no_debug = { { "sip", "no", "debug", NULL }, sip_no_debug, "Disable SIP debugging", no_debug_usage }; static int sip_poke_peer_s(void *data) { struct sip_peer *peer = data; peer->pokeexpire = -1; sip_poke_peer(peer); return 0; } static void parse_moved_contact(struct sip_pvt *p, struct sip_request *req) { char tmp[256] = ""; char *s, *e; strncpy(tmp, get_header(req, "Contact"), sizeof(tmp) - 1); s = ditch_braces(tmp); e = strchr(tmp, '@'); if (e) *e = '\0'; if (!strncasecmp(s, "sip:", 4)) s += 4; ast_log(LOG_DEBUG, "Found 302 Redirect to extension '%s'\n", s); if (p->owner) strncpy(p->owner->call_forward, s, sizeof(p->owner->call_forward) - 1); } static void handle_response(struct sip_pvt *p, int resp, char *rest, struct sip_request *req) { char *to; char *msg, *c; struct ast_channel *owner; struct sip_peer *peer; int pingtime; struct timeval tv; int seqno=0; c = get_header(req, "Cseq"); if (sscanf(c, "%d ", &seqno) != 1) { ast_log(LOG_WARNING, "Unable to determine sequence number\n"); } msg = strchr(c, ' '); if (!msg) msg = ""; else msg++; owner = p->owner; /* Acknowledge whatever it is destined for */ __sip_ack(p, seqno, 0); if (p->peerpoke) { /* We don't really care what the response is, just that it replied back. Well, as long as it's not a 100 response... since we might need to hang around for something more "difinitive" */ if (resp != 100) { int statechanged = 0; peer = p->peerpoke; gettimeofday(&tv, NULL); pingtime = (tv.tv_sec - peer->ps.tv_sec) * 1000 + (tv.tv_usec - peer->ps.tv_usec) / 1000; if (pingtime < 1) pingtime = 1; if ((peer->lastms < 0) || (peer->lastms > peer->maxms)) { if (pingtime <= peer->maxms) { ast_log(LOG_NOTICE, "Peer '%s' is now REACHABLE!\n", peer->name); statechanged = 1; } } else if ((peer->lastms > 0) && (peer->lastms <= peer->maxms)) { if (pingtime > peer->maxms) { ast_log(LOG_NOTICE, "Peer '%s' is now TOO LAGGED!\n", peer->name); statechanged = 1; } } if (!peer->lastms) statechanged = 1; peer->lastms = pingtime; peer->call = NULL; if (statechanged) ast_device_state_changed("SIP/%s", peer->name); if (peer->pokeexpire > -1) ast_sched_del(sched, peer->pokeexpire); if (!strcasecmp(msg, "INVITE")) transmit_request(p, "ACK", seqno, 0); p->needdestroy = 1; /* Try again eventually */ if ((peer->lastms < 0) || (peer->lastms > peer->maxms)) peer->pokeexpire = ast_sched_add(sched, DEFAULT_FREQ_NOTOK, sip_poke_peer_s, peer); else peer->pokeexpire = ast_sched_add(sched, DEFAULT_FREQ_OK, sip_poke_peer_s, peer); } } else if (p->outgoing) { /* Acknowledge sequence number */ if (p->initid > -1) { /* Don't auto congest anymore since we've gotten something useful back */ ast_sched_del(sched, p->initid); p->initid = -1; } /* Get their tag if we haven't already */ to = get_header(req, "To"); to = strstr(to, "tag="); if (to) { to += 4; strncpy(p->theirtag, to, sizeof(p->theirtag) - 1); to = strchr(p->theirtag, ';'); if (to) *to = '\0'; } switch(resp) { case 100: break; case 183: /* We don't really need this since we pass in-band audio anyway */ { /* Send back an empty audio frame to get things moving, (like in the case of back-to-back 183's, getting audio */ if (strlen(get_header(req, "Content-Type"))) process_sdp(p, req); if (p->owner && p->owner->pvt) { struct ast_frame af = { AST_FRAME_VOICE, }; af.subclass = p->owner->pvt->rawreadformat; ast_queue_frame(p->owner, &af, 0); } } break; case 180: if (p->owner) { ast_queue_control(p->owner, AST_CONTROL_RINGING, 0); if (p->owner->_state != AST_STATE_UP) ast_setstate(p->owner, AST_STATE_RINGING); } break; case 200: if (!strcasecmp(msg, "NOTIFY")) { /* They got the notify, this is the end */ if (p->owner) { ast_log(LOG_WARNING, "Notify answer on an owned channel?\n"); ast_queue_hangup(p->owner, 0); } else { if (!p->subscribed) { sip_destroy(p); p = NULL; } } } else if (!strcasecmp(msg, "INVITE")) { if (strlen(get_header(req, "Content-Type"))) process_sdp(p, req); /* Save Record-Route for any later requests we make on this dialogue */ build_route(p, req, 1); if (p->owner) { if (p->owner->_state != AST_STATE_UP) { ast_setstate(p->owner, AST_STATE_UP); ast_queue_control(p->owner, AST_CONTROL_ANSWER, 0); } } transmit_request(p, "ACK", seqno, 0); /* Go ahead and send bye at this point */ if (p->pendingbye) { transmit_request(p, "BYE", 0, 1); p->needdestroy = 1; } } else if (!strcasecmp(msg, "REGISTER")) { /* char *exp; */ int expires; struct sip_registry *r; r=p->registry; if (r) { r->regstate=REG_STATE_REGISTERED; ast_log(LOG_DEBUG, "Registration successful\n"); if (r->timeout > -1) { ast_log(LOG_DEBUG, "Cancelling timeout %d\n", r->timeout); ast_sched_del(sched, r->timeout); } r->timeout=-1; r->call = NULL; p->registry = NULL; p->needdestroy = 1; /* set us up for re-registering */ /* figure out how long we got registered for */ if (r->expire > -1) ast_sched_del(sched, r->expire); expires=atoi(get_header(req, "expires")); if (!expires) expires=default_expiry; r->expire=ast_sched_add(sched, (expires-2)*1000, sip_reregister, r); } else ast_log(LOG_WARNING, "Got 200 OK on REGISTER that isn't a register\n"); } break; case 401: /* Not authorized on REGISTER */ if (p->registry && !strcasecmp(msg, "REGISTER")) { if (do_register_auth(p, req)) { ast_log(LOG_NOTICE, "Failed to authenticate on REGISTER to '%s'\n", get_header(&p->initreq, "From")); p->needdestroy = 1; } } else p->needdestroy = 1; break; case 407: if (!strcasecmp(msg, "INVITE")) { /* First we ACK */ transmit_request(p, "ACK", seqno, 0); /* Then we AUTH */ if (do_proxy_auth(p, req)) { ast_log(LOG_NOTICE, "Failed to authenticate on INVITE to '%s'\n", get_header(&p->initreq, "From")); p->needdestroy = 1; } } else p->needdestroy = 1; break; default: if ((resp >= 300) && (resp < 700)) { if ((option_verbose > 2) && (resp != 487)) ast_verbose(VERBOSE_PREFIX_3 "Got SIP response %d \"%s\" back from %s\n", resp, rest, inet_ntoa(p->sa.sin_addr)); p->alreadygone = 1; if (p->rtp) { /* Immediately stop RTP */ ast_rtp_stop(p->rtp); } /* XXX Locking issues?? XXX */ switch(resp) { case 302: /* Moved temporarily */ parse_moved_contact(p, req); if (p->owner) ast_queue_control(p->owner, AST_CONTROL_BUSY, 0); break; case 486: /* Busy here */ case 600: /* Busy everywhere */ if (p->owner) ast_queue_control(p->owner, AST_CONTROL_BUSY, 0); break; case 480: /* Temporarily Unavailable */ case 404: /* Not Found */ case 410: /* Gone */ case 500: /* Server error */ case 501: /* Not Implemented */ if (owner) ast_queue_control(p->owner, AST_CONTROL_CONGESTION, 0); break; default: /* Send hangup */ if (owner) ast_queue_hangup(p->owner, 0); break; } /* ACK on invite */ if (!strcasecmp(msg, "INVITE")) transmit_request(p, "ACK", seqno, 0); p->alreadygone = 1; if (!p->owner) p->needdestroy = 1; } else ast_log(LOG_NOTICE, "Dunno anything about a %d %s response from %s\n", resp, rest, p->owner ? p->owner->name : inet_ntoa(p->sa.sin_addr)); } } else { if (sipdebug) ast_verbose("Message is %s\n", msg); switch(resp) { case 200: if (!strcasecmp(msg, "INVITE") || !strcasecmp(msg, "REGISTER") ) transmit_request(p, "ACK", seqno, 0); break; } } if (owner) ast_pthread_mutex_unlock(&owner->lock); if (p) ast_pthread_mutex_unlock(&p->lock); } static int determine_firstline_parts( struct sip_request *req ) { char *e, *cmd; int len; cmd= req->header[0]; while(*cmd && (*cmd < 33)) { cmd++; } if (!*cmd) { return -1; } e= cmd; while(*e && (*e > 32)) { e++; } /* Get the command */ if (*e) { *e = '\0'; e++; } req->rlPart1= cmd; while( *e && ( *e < 33 ) ) { e++; } if( !*e ) { return -1; } if ( !strcasecmp(cmd, "SIP/2.0") ) { /* We have a response */ req->rlPart2= e; len= strlen( req->rlPart2 ); if( len < 2 ) { return -1; } e+= len - 1; while( *e && *e<33 ) { e--; } *(++e)= '\0'; } else { /* We have a request */ if( *e == '<' ) { e++; if( !*e ) { return -1; } } req->rlPart2= e; if( ( e= strrchr( req->rlPart2, 'S' ) ) == NULL ) { return -1; } while( isspace( *(--e) ) ) {} if( *e == '>' ) { *e= '\0'; } else { *(++e)= '\0'; } } return 1; } static int attempt_transfer(struct sip_pvt *p1, struct sip_pvt *p2) { if (!p1->owner || !p2->owner) { ast_log(LOG_WARNING, "Transfer attempted without dual ownership?\n"); return -1; } if (p1->owner->bridge) { if (p2->owner->bridge) ast_moh_stop(p2->owner->bridge); ast_moh_stop(p1->owner->bridge); ast_moh_stop(p1->owner); ast_moh_stop(p2->owner); if (ast_channel_masquerade(p2->owner, p1->owner->bridge)) { ast_log(LOG_WARNING, "Failed to masquerade %s into %s\n", p2->owner->name, p1->owner->bridge->name); return -1; } } else if (p2->owner->bridge) { ast_moh_stop(p2->owner->bridge); ast_moh_stop(p2->owner); ast_moh_stop(p1->owner); if (ast_channel_masquerade(p1->owner, p2->owner->bridge)) { ast_log(LOG_WARNING, "Failed to masquerade %s into %s\n", p1->owner->name, p2->owner->bridge->name); return -1; } } else { ast_log(LOG_NOTICE, "Transfer attempted with no bridged calls to transfer\n"); return -1; } return 0; } static int handle_request(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin) { /* Called with p->lock held, as well as p->owner->lock if appropriate, keeping things relatively static */ struct sip_request resp; char *cmd; char *cseq; char *from; char *e; struct ast_channel *c=NULL; int seqno; int len; int ignore=0; int respid; int res; int gotdest; /* Clear out potential response */ memset(&resp, 0, sizeof(resp)); /* Get Method and Cseq */ cseq = get_header(req, "Cseq"); cmd = req->header[0]; /* Must have Cseq */ if (!strlen(cmd) || !strlen(cseq)) return -1; if (sscanf(cseq, "%i%n", &seqno, &len) != 1) { ast_log(LOG_DEBUG, "No seqno in '%s'\n", cmd); return -1; } /* Get the command */ cseq += len; /* Determine the request URI for sip, sips or tel URIs */ if( determine_firstline_parts( req ) < 0 ) { return -1; } cmd= req->rlPart1; e= req->rlPart2; if (strcasecmp(cmd, "SIP/2.0")) { /* Request coming in */ if (p->icseq && (p->icseq < seqno)) { ast_log(LOG_DEBUG, "Ignoring out of order packet %d (expecting %d)\n", seqno, p->icseq); return -1; } else if (p->icseq && (p->icseq != seqno)) { /* ignore means "don't do anything with it" but still have to respond appropriately */ ignore=1; } if (!strlen(p->theirtag)) { from = get_header(req, "From"); from = strstr(from, "tag="); if (from) { from += 4; strncpy(p->theirtag, from, sizeof(p->theirtag) - 1); from = strchr(p->theirtag, ';'); if (from) *from = '\0'; } } } else { /* Response to our request -- Do some sanity checks */ if (!p->initreq.headers) { ast_log(LOG_DEBUG, "That's odd... Got a response on a call we dont know about.\n"); p->needdestroy = 1; return 0; } else if (p->ocseq && (p->ocseq < seqno)) { ast_log(LOG_DEBUG, "Ignoring out of order response %d (expecting %d)\n", seqno, p->ocseq); return -1; } else if (p->ocseq && (p->ocseq != seqno)) { /* ignore means "don't do anything with it" but still have to respond appropriately */ ignore=1; } } if (strcmp(cmd, "SIP/2.0") && (seqno >= p->icseq)) /* Next should follow monotonically increasing */ p->icseq = seqno + 1; /* Initialize the context if it hasn't been already */ if (!strcasecmp(cmd, "OPTIONS")) { res = get_destination(p, req); build_contact(p); /* XXX Should we authenticate OPTIONS? XXX */ if (!strlen(p->context)) strncpy(p->context, context, sizeof(p->context) - 1); if (res < 0) transmit_response_with_allow(p, "404 Not Found", req); else if (res > 0) transmit_response_with_allow(p, "484 Address Incomplete", req); else transmit_response_with_allow(p, "200 OK", req); } else if (!strcasecmp(cmd, "INVITE")) { if (p->outgoing && p->owner && (p->owner->_state != AST_STATE_UP)) { /* This is a call to ourself. Send ourselves an error code and stop processing immediately, as SIP really has no good mechanism for being able to call yourself */ transmit_response(p, "482 Loop Detected", req); /* We do NOT destroy p here, so that our response will be accepted */ return 0; } /* Process the SDP portion */ if (!ignore) { /* Use this as the basis */ if (sipdebug) ast_verbose("Using latest request as basis request\n"); /* This call is no longer outgoing if it ever was */ p->outgoing = 0; copy_request(&p->initreq, req); check_via(p, req); if (strlen(get_header(req, "Content-Type"))) { if (process_sdp(p, req)) return -1; } else { p->capability = capability; ast_log(LOG_DEBUG, "Hm.... No sdp for the moemnt\n"); } } else if (sipdebug) ast_verbose("Ignoring this request\n"); if (!p->lastinvite) { /* Handle authentication if this is our first invite */ res = check_user(p, req, cmd, e, 1); if (res) { if (res < 0) { ast_log(LOG_NOTICE, "Failed to authenticate user %s\n", get_header(req, "From")); p->needdestroy = 1; } return 0; } /* Initialize the context if it hasn't been already */ if (!strlen(p->context)) strncpy(p->context, context, sizeof(p->context) - 1); /* Get destination right away */ gotdest = get_destination(p, NULL); build_contact(p); if (gotdest) { if (gotdest < 0) transmit_response(p, "404 Not Found", req); else transmit_response(p, "484 Address Incomplete", req); p->needdestroy = 1; } else { /* If no extension was specified, use the s one */ if (!strlen(p->exten)) strncpy(p->exten, "s", sizeof(p->exten) - 1); /* Initialize tag */ p->tag = rand(); /* First invitation */ c = sip_new(p, AST_STATE_DOWN, strlen(p->username) ? p->username : NULL); /* Save Record-Route for any later requests we make on this dialogue */ build_route(p, req, 0); if (c) { /* Pre-lock the call */ ast_pthread_mutex_lock(&c->lock); } } } else c = p->owner; if (!ignore && p) p->lastinvite = seqno; if (c) { switch(c->_state) { case AST_STATE_DOWN: transmit_response(p, "100 Trying", req); ast_setstate(c, AST_STATE_RING); if (strcmp(p->exten, ast_pickup_ext())) { if (ast_pbx_start(c)) { ast_log(LOG_WARNING, "Failed to start PBX :(\n"); /* Unlock locks so ast_hangup can do its magic */ ast_pthread_mutex_unlock(&c->lock); ast_pthread_mutex_unlock(&p->lock); ast_hangup(c); ast_pthread_mutex_lock(&p->lock); transmit_response_reliable(p, "503 Unavailable", req); c = NULL; } } else if (ast_pickup_call(c)) { ast_log(LOG_NOTICE, "Nothing to pick up\n"); transmit_response_reliable(p, "503 Unavailable", req); p->alreadygone = 1; /* Unlock locks so ast_hangup can do its magic */ ast_pthread_mutex_unlock(&c->lock); ast_pthread_mutex_unlock(&p->lock); ast_hangup(c); ast_pthread_mutex_lock(&p->lock); c = NULL; } else { ast_pthread_mutex_unlock(&c->lock); ast_pthread_mutex_unlock(&p->lock); ast_hangup(c); ast_pthread_mutex_lock(&p->lock); c = NULL; } break; case AST_STATE_RING: transmit_response(p, "100 Trying", req); break; case AST_STATE_RINGING: transmit_response(p, "180 Ringing", req); break; case AST_STATE_UP: transmit_response_with_sdp(p, "200 OK", req, 1); break; default: ast_log(LOG_WARNING, "Don't know how to handle INVITE in state %d\n", c->_state); transmit_response(p, "100 Trying", req); } } else { if (p && !p->needdestroy) { ast_log(LOG_NOTICE, "Unable to create/find channel\n"); transmit_response_reliable(p, "503 Unavailable", req); p->needdestroy = 1; } } } else if (!strcasecmp(cmd, "REFER")) { struct ast_channel *transfer_to; ast_log(LOG_DEBUG, "We found a REFER!\n"); if (!strlen(p->context)) strncpy(p->context, context, sizeof(p->context) - 1); res = get_refer_info(p, req); if (res < 0) transmit_response_with_allow(p, "404 Not Found", req); else if (res > 0) transmit_response_with_allow(p, "484 Address Incomplete", req); else { transmit_response(p, "202 Accepted", req); if (p->refer_call) { ast_log(LOG_DEBUG,"202 Accepted (supervised)\n"); attempt_transfer(p, p->refer_call); ast_pthread_mutex_unlock(&p->refer_call->lock); p->refer_call = NULL; } else { ast_log(LOG_DEBUG,"202 Accepted (blind)\n"); c = p->owner; if (c) { transfer_to = c->bridge; if (transfer_to) ast_async_goto(transfer_to,p->context, p->refer_to,1, 1); } } /* Always increment on a BYE */ transmit_request_with_auth(p, "BYE", 0, 1); p->alreadygone = 1; } } else if (!strcasecmp(cmd, "CANCEL")) { p->alreadygone = 1; if (p->rtp) { /* Immediately stop RTP */ ast_rtp_stop(p->rtp); } if (p->owner) ast_queue_hangup(p->owner, 0); transmit_response(p, "200 OK", req); transmit_response_reliable(p, "487 Request Terminated", &p->initreq); } else if (!strcasecmp(cmd, "BYE")) { copy_request(&p->initreq, req); p->alreadygone = 1; if (p->rtp) { /* Immediately stop RTP */ ast_rtp_stop(p->rtp); } if (p->owner) ast_queue_hangup(p->owner, 0); transmit_response(p, "200 OK", req); } else if (!strcasecmp(cmd, "MESSAGE")) { if (sipdebug) ast_verbose("Receiving message!\n"); receive_message(p, req); transmit_response(p, "200 OK", req); } else if (!strcasecmp(cmd, "SUBSCRIBE")) { if (!ignore) { /* Use this as the basis */ if (sipdebug) ast_verbose("Using latest SUBSCRIBE request as basis request\n"); /* This call is no longer outgoing if it ever was */ p->outgoing = 0; copy_request(&p->initreq, req); check_via(p, req); } else if (sipdebug) ast_verbose("Ignoring this request\n"); if (!p->lastinvite) { /* Handle authentication if this is our first subscribe */ res = check_user(p, req, cmd, e, 0); if (res) { if (res < 0) { ast_log(LOG_NOTICE, "Failed to authenticate user %s for SUBSCRIBE\n", get_header(req, "From")); sip_destroy(p); } return 0; } /* Initialize the context if it hasn't been already */ if (!strlen(p->context)) strncpy(p->context, context, sizeof(p->context) - 1); /* Get destination right away */ gotdest = get_destination(p, NULL); build_contact(p); if (gotdest) { if (gotdest < 0) transmit_response(p, "404 Not Found", req); else transmit_response(p, "484 Address Incomplete", req); sip_destroy(p); p = NULL; c = NULL; } else { /* Initialize tag */ p->tag = rand(); if (!strcmp(get_header(req, "Accept"), "application/dialog-info+xml")) p->subscribed = 2; else p->subscribed = 1; p->stateid = ast_extension_state_add(p->context, p->exten, cb_extensionstate, p); } } else c = p->owner; if (!ignore && p) p->lastinvite = seqno; if (p) { if (!(p->expiry = atoi(get_header(req, "Expires")))) { transmit_response(p, "200 OK", req); sip_destroy(p); return 0; } // The next line can be removed if the SNOM200 Expires bug is fixed if (p->subscribed == 1) { if (p->expiry>max_expiry) p->expiry = max_expiry; } transmit_response(p, "200 OK", req); sip_scheddestroy(p, (p->expiry+10)*1000); transmit_state_notify(p, ast_extension_state(NULL, p->context, p->exten),1); } } else if (!strcasecmp(cmd, "INFO")) { if (sipdebug) ast_verbose("Receiving DTMF!\n"); receive_info(p, req); transmit_response(p, "200 OK", req); } else if (!strcasecmp(cmd, "REGISTER")) { /* Use this as the basis */ if (sipdebug) ast_verbose("Using latest request as basis request\n"); copy_request(&p->initreq, req); check_via(p, req); if ((res = register_verify(p, sin, req, e)) < 0) ast_log(LOG_NOTICE, "Registration from '%s' failed for '%s'\n", get_header(req, "To"), inet_ntoa(sin->sin_addr)); if (res < 1) { p->needdestroy = 1; } } else if (!strcasecmp(cmd, "ACK")) { /* Uhm, I haven't figured out the point of the ACK yet. Are we supposed to retransmit responses until we get an ack? Make sure this is on a valid call */ __sip_ack(p, seqno, 1); if (strlen(get_header(req, "Content-Type"))) { if (process_sdp(p, req)) return -1; } if (!p->lastinvite && !strlen(p->randdata)) p->needdestroy = 1; } else if (!strcasecmp(cmd, "SIP/2.0")) { while(*e && (*e < 33)) e++; if (sscanf(e, "%i %n", &respid, &len) != 1) { ast_log(LOG_WARNING, "Invalid response: '%s'\n", e); } else { handle_response(p, respid, e + len, req); } } else { transmit_response_with_allow(p, "405 Method Not Allowed", req); ast_log(LOG_NOTICE, "Unknown SIP command '%s' from '%s'\n", cmd, inet_ntoa(p->sa.sin_addr)); /* If this is some new method, and we don't have a call, destory it now */ if (!p->initreq.headers) p->needdestroy = 1; } return 0; } static int sipsock_read(int *id, int fd, short events, void *ignore) { struct sip_request req; struct sockaddr_in sin = { 0, }; struct sip_pvt *p; int res; int len; len = sizeof(sin); memset(&req, 0, sizeof(req)); res = recvfrom(sipsock, req.data, sizeof(req.data) - 1, 0, (struct sockaddr *)&sin, &len); if (res < 0) { if (errno != ECONNREFUSED) ast_log(LOG_WARNING, "Recv error: %s\n", strerror(errno)); return 1; } req.data[res] = '\0'; req.len = res; if (sipdebug) ast_verbose("Sip read: \n%s\n", req.data); parse(&req); if (req.headers < 2) { /* Must have at least two headers */ return 1; } /* Process request, with netlock held */ ast_pthread_mutex_lock(&netlock); p = find_call(&req, &sin); if (p) { retrylock: /* Go ahead and lock the owner if it has one -- we may need it */ if (p->owner && pthread_mutex_trylock(&p->owner->lock)) { ast_log(LOG_DEBUG, "Failed to grab lock, trying again...\n"); ast_pthread_mutex_unlock(&p->lock); /* Sleep infintismly short amount of time */ usleep(1); goto retrylock; } memcpy(&p->recv, &sin, sizeof(p->recv)); handle_request(p, &req, &sin); if (p->owner) ast_pthread_mutex_unlock(&p->owner->lock); ast_pthread_mutex_unlock(&p->lock); } ast_pthread_mutex_unlock(&netlock); return 1; } static int sip_send_mwi_to_peer(struct sip_peer *peer) { /* Called with peerl lock, but releases it */ struct sip_pvt *p; char name[256] = ""; int newmsgs, oldmsgs; /* Check for messages */ ast_app_messagecount(peer->mailbox, &newmsgs, &oldmsgs); time(&peer->lastmsgcheck); /* Return now if it's the same thing we told them last time */ if (((newmsgs << 8) | (oldmsgs)) == peer->lastmsgssent) { ast_pthread_mutex_unlock(&peerl.lock); return 0; } p = sip_alloc(NULL, NULL, 0); if (!p) { ast_log(LOG_WARNING, "Unable to build sip pvt data for MWI\n"); ast_pthread_mutex_unlock(&peerl.lock); return -1; } strncpy(name, peer->name, sizeof(name) - 1); peer->lastmsgssent = ((newmsgs << 8) | (oldmsgs)); ast_pthread_mutex_unlock(&peerl.lock); if (create_addr(p, peer->name)) { /* Maybe they're not registered, etc. */ sip_destroy(p); return 0; } /* Recalculate our side, and recalculate Call ID */ memcpy(&p->ourip, myaddrfor(&p->sa.sin_addr), sizeof(p->ourip)); snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", inet_ntoa(p->ourip), ourport, p->branch); build_callid(p->callid, sizeof(p->callid), p->ourip); /* Send MWI */ p->outgoing = 1; transmit_notify(p, newmsgs, oldmsgs); sip_scheddestroy(p, 15000); return 0; } static void *do_monitor(void *data) { int res; struct sip_pvt *sip; struct sip_peer *peer; time_t t; /* Add an I/O event to our UDP socket */ if (sipsock > -1) ast_io_add(io, sipsock, sipsock_read, AST_IO_IN, NULL); /* This thread monitors all the frame relay interfaces which are not yet in use (and thus do not have a separate thread) indefinitely */ /* From here on out, we die whenever asked */ for(;;) { /* Check for interfaces needing to be killed */ ast_pthread_mutex_lock(&iflock); restartsearch: sip = iflist; while(sip) { ast_pthread_mutex_lock(&sip->lock); if (sip->needdestroy && !sip->packets) { ast_pthread_mutex_unlock(&sip->lock); __sip_destroy(sip, 1); goto restartsearch; } ast_pthread_mutex_unlock(&sip->lock); sip = sip->next; } ast_pthread_mutex_unlock(&iflock); /* Don't let anybody kill us right away. Nobody should lock the interface list and wait for the monitor list, but the other way around is okay. */ ast_pthread_mutex_lock(&monlock); /* Lock the network interface */ ast_pthread_mutex_lock(&netlock); /* Okay, now that we know what to do, release the network lock */ ast_pthread_mutex_unlock(&netlock); /* And from now on, we're okay to be killed, so release the monitor lock as well */ ast_pthread_mutex_unlock(&monlock); pthread_testcancel(); /* Wait for sched or io */ res = ast_sched_wait(sched); if ((res < 0) || (res > 1000)) res = 1000; res = ast_io_wait(io, res); ast_pthread_mutex_lock(&monlock); if (res >= 0) ast_sched_runq(sched); ast_pthread_mutex_lock(&peerl.lock); peer = peerl.peers; time(&t); while(peer) { if (strlen(peer->mailbox) && (t - peer->lastmsgcheck > 10)) { sip_send_mwi_to_peer(peer); break; } peer = peer->next; } /* Remember, sip_send_mwi_to_peer releases the lock if we've called it */ if (!peer) ast_pthread_mutex_unlock(&peerl.lock); ast_pthread_mutex_unlock(&monlock); } /* Never reached */ return NULL; } static int restart_monitor(void) { /* If we're supposed to be stopped -- stay stopped */ if (monitor_thread == -2) return 0; if (ast_pthread_mutex_lock(&monlock)) { ast_log(LOG_WARNING, "Unable to lock monitor\n"); return -1; } if (monitor_thread == pthread_self()) { ast_pthread_mutex_unlock(&monlock); ast_log(LOG_WARNING, "Cannot kill myself\n"); return -1; } if (monitor_thread) { /* Wake up the thread */ pthread_kill(monitor_thread, SIGURG); } else { /* Start a new monitor */ if (pthread_create(&monitor_thread, NULL, do_monitor, NULL) < 0) { ast_pthread_mutex_unlock(&monlock); ast_log(LOG_ERROR, "Unable to start monitor thread.\n"); return -1; } } ast_pthread_mutex_unlock(&monlock); return 0; } static int sip_poke_noanswer(void *data) { struct sip_peer *peer = data; peer->pokeexpire = -1; if (peer->lastms > -1) ast_log(LOG_NOTICE, "Peer '%s' is now UNREACHABLE!\n", peer->name); if (peer->call) sip_destroy(peer->call); peer->call = NULL; peer->lastms = -1; ast_device_state_changed("SIP/%s", peer->name); /* Try again quickly */ peer->pokeexpire = ast_sched_add(sched, DEFAULT_FREQ_NOTOK, sip_poke_peer_s, peer); return 0; } static int sip_poke_peer(struct sip_peer *peer) { struct sip_pvt *p; if (!peer->maxms || !peer->addr.sin_addr.s_addr) { /* IF we have no IP, or this isn't to be monitored, return imeediately after clearing things out */ peer->lastms = 0; peer->pokeexpire = -1; peer->call = NULL; return 0; } if (peer->call > 0) { ast_log(LOG_NOTICE, "Still have a call...\n"); sip_destroy(peer->call); } p = peer->call = sip_alloc(NULL, NULL, 0); if (!peer->call) { ast_log(LOG_WARNING, "Unable to allocate call for poking peer '%s'\n", peer->name); return -1; } memcpy(&p->sa, &peer->addr, sizeof(p->sa)); memcpy(&p->recv, &peer->addr, sizeof(p->sa)); /* Recalculate our side, and recalculate Call ID */ memcpy(&p->ourip, myaddrfor(&p->sa.sin_addr), sizeof(p->ourip)); snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", inet_ntoa(p->ourip), ourport, p->branch); build_callid(p->callid, sizeof(p->callid), p->ourip); if (peer->pokeexpire > -1) ast_sched_del(sched, peer->pokeexpire); p->peerpoke = peer; p->outgoing = 1; #ifdef VOCAL_DATA_HACK strncpy(p->username, "__VOCAL_DATA_SHOULD_READ_THE_SIP_SPEC__", sizeof(p->username)); transmit_invite(p, "INVITE", 0, NULL, NULL); #else transmit_invite(p, "OPTIONS", 0, NULL, NULL); #endif gettimeofday(&peer->ps, NULL); peer->pokeexpire = ast_sched_add(sched, DEFAULT_MAXMS * 2, sip_poke_noanswer, peer); return 0; } static int sip_devicestate(void *data) { char *ext, *host; char tmp[256] = ""; char *dest = data; struct hostent *hp; struct sip_peer *p; int found = 0; int res = AST_DEVICE_INVALID; strncpy(tmp, dest, sizeof(tmp) - 1); host = strchr(tmp, '@'); if (host) { *host = '\0'; host++; ext = tmp; } else { host = tmp; ext = NULL; } ast_pthread_mutex_lock(&peerl.lock); p = peerl.peers; while (p) { if (!strcasecmp(p->name, host)) { found++; res = AST_DEVICE_UNAVAILABLE; if ((p->addr.sin_addr.s_addr || p->defaddr.sin_addr.s_addr) && (!p->maxms || ((p->lastms > -1) && (p->lastms <= p->maxms)))) { /* peer found and valid */ res = AST_DEVICE_UNKNOWN; break; } } p = p->next; } ast_pthread_mutex_unlock(&peerl.lock); if (!p && !found) { hp = gethostbyname(host); if (hp) res = AST_DEVICE_UNKNOWN; } return res; } static struct ast_channel *sip_request(char *type, int format, void *data) { int oldformat; struct sip_pvt *p; struct ast_channel *tmpc = NULL; char *ext, *host; char tmp[256] = ""; char *dest = data; oldformat = format; format &= capability; if (!format) { ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format %d while capability is %d\n", oldformat, capability); return NULL; } p = sip_alloc(NULL, NULL, 0); if (!p) { ast_log(LOG_WARNING, "Unable to build sip pvt data for '%s'\n", (char *)data); return NULL; } strncpy(tmp, dest, sizeof(tmp) - 1); host = strchr(tmp, '@'); if (host) { *host = '\0'; host++; ext = tmp; } else { host = tmp; ext = NULL; } /* Assign a default capability */ p->capability = capability; if (create_addr(p, host)) { sip_destroy(p); return NULL; } /* Recalculate our side, and recalculate Call ID */ memcpy(&p->ourip, myaddrfor(&p->sa.sin_addr), sizeof(p->ourip)); snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", inet_ntoa(p->ourip), ourport, p->branch); build_callid(p->callid, sizeof(p->callid), p->ourip); if (ext) strncpy(p->username, ext, sizeof(p->username) - 1); #if 0 printf("Setting up to call extension '%s' at '%s'\n", ext ? ext : "", host); #endif tmpc = sip_new(p, AST_STATE_DOWN, host); if (!tmpc) sip_destroy(p); restart_monitor(); return tmpc; } static struct sip_user *build_user(char *name, struct ast_variable *v) { struct sip_user *user; int format; user = (struct sip_user *)malloc(sizeof(struct sip_user)); if (user) { memset(user, 0, sizeof(struct sip_user)); strncpy(user->name, name, sizeof(user->name)-1); user->canreinvite = REINVITE_INVITE; /* JK02: set default context */ strcpy(user->context, context); while(v) { if (!strcasecmp(v->name, "context")) { strncpy(user->context, v->value, sizeof(user->context)); } else if (!strcasecmp(v->name, "permit") || !strcasecmp(v->name, "deny")) { user->ha = ast_append_ha(v->name, v->value, user->ha); } else if (!strcasecmp(v->name, "auth")) { strncpy(user->methods, v->value, sizeof(user->methods)-1); } else if (!strcasecmp(v->name, "secret")) { strncpy(user->secret, v->value, sizeof(user->secret)-1); } else if (!strcasecmp(v->name, "dtmfmode")) { if (!strcasecmp(v->value, "inband")) user->dtmfmode=SIP_DTMF_INBAND; else if (!strcasecmp(v->value, "rfc2833")) user->dtmfmode = SIP_DTMF_RFC2833; else if (!strcasecmp(v->value, "info")) user->dtmfmode = SIP_DTMF_INFO; else { ast_log(LOG_WARNING, "Unknown dtmf mode '%s', using rfc2833\n", v->value); user->dtmfmode = SIP_DTMF_RFC2833; } } else if (!strcasecmp(v->name, "canreinvite")) { if (!strcasecmp(v->value, "update")) user->canreinvite = REINVITE_UPDATE; else user->canreinvite = ast_true(v->value); } else if (!strcasecmp(v->name, "nat")) { user->nat = ast_true(v->value); } else if (!strcasecmp(v->name, "callerid")) { strncpy(user->callerid, v->value, sizeof(user->callerid)-1); user->hascallerid=1; } else if (!strcasecmp(v->name, "callgroup")) { user->callgroup = ast_get_group(v->value); } else if (!strcasecmp(v->name, "pickupgroup")) { user->pickupgroup = ast_get_group(v->value); } else if (!strcasecmp(v->name, "accountcode")) { strncpy(user->accountcode, v->value, sizeof(user->accountcode)-1); } else if (!strcasecmp(v->name, "amaflags")) { format = ast_cdr_amaflags2int(v->value); if (format < 0) { ast_log(LOG_WARNING, "Invalid AMA Flags: %s at line %d\n", v->value, v->lineno); } else { user->amaflags = format; } } else if (!strcasecmp(v->name, "insecure")) { user->insecure = ast_true(v->value); } //else if (strcasecmp(v->name,"type")) // ast_log(LOG_WARNING, "Ignoring %s\n", v->name); v = v->next; } } if (!strlen(user->methods)) { if (strlen(user->secret)) strncpy(user->methods, "md5,plaintext", sizeof(user->methods) - 1); } return user; } static struct sip_peer *build_peer(char *name, struct ast_variable *v) { struct sip_peer *peer; struct sip_peer *prev; int maskfound=0; int format; int found=0; prev = NULL; ast_pthread_mutex_lock(&peerl.lock); peer = peerl.peers; while(peer) { if (!strcasecmp(peer->name, name)) { break; } prev = peer; peer = peer->next; } if (peer) { found++; /* Already in the list, remove it and it will be added back (or FREE'd) */ if (prev) { prev->next = peer->next; } else { peerl.peers = peer->next; } ast_pthread_mutex_unlock(&peerl.lock); } else { ast_pthread_mutex_unlock(&peerl.lock); peer = malloc(sizeof(struct sip_peer)); memset(peer, 0, sizeof(struct sip_peer)); peer->expire = -1; peer->pokeexpire = -1; peer->lastmsgssent = -1; } if (peer) { if (!found) { strncpy(peer->name, name, sizeof(peer->name)-1); strncpy(peer->context, context, sizeof(peer->context)-1); peer->addr.sin_port = htons(DEFAULT_SIP_PORT); peer->expiry = expiry; } peer->capability = capability; /* Assume can reinvite */ peer->canreinvite = REINVITE_INVITE; peer->dtmfmode = 0; while(v) { if (!strcasecmp(v->name, "secret")) strncpy(peer->secret, v->value, sizeof(peer->secret)-1); else if (!strcasecmp(v->name, "auth")) strncpy(peer->methods, v->value, sizeof(peer->methods)-1); else if (!strcasecmp(v->name, "canreinvite")) { if (!strcasecmp(v->value, "update")) peer->canreinvite = REINVITE_UPDATE; else peer->canreinvite = ast_true(v->value); } else if (!strcasecmp(v->name, "nat")) peer->nat = ast_true(v->value); else if (!strcasecmp(v->name, "context")) strncpy(peer->context, v->value, sizeof(peer->context)-1); else if (!strcasecmp(v->name, "fromdomain")) strncpy(peer->fromdomain, v->value, sizeof(peer->fromdomain)-1); else if (!strcasecmp(v->name, "fromuser")) strncpy(peer->fromuser, v->value, sizeof(peer->fromuser)-1); else if (!strcasecmp(v->name, "dtmfmode")) { if (!strcasecmp(v->value, "inband")) peer->dtmfmode=SIP_DTMF_INBAND; else if (!strcasecmp(v->value, "rfc2833")) peer->dtmfmode = SIP_DTMF_RFC2833; else if (!strcasecmp(v->value, "info")) peer->dtmfmode = SIP_DTMF_INFO; else { ast_log(LOG_WARNING, "Unknown dtmf mode '%s', using rfc2833\n", v->value); peer->dtmfmode = SIP_DTMF_RFC2833; } } else if (!strcasecmp(v->name, "host")) { if (!strcasecmp(v->value, "dynamic")) { /* They'll register with us */ peer->dynamic = 1; if (!found) { /* Initialize stuff iff we're not found, otherwise we keep going with what we had */ memset(&peer->addr.sin_addr, 0, 4); if (peer->addr.sin_port) { /* If we've already got a port, make it the default rather than absolute */ peer->defaddr.sin_port = peer->addr.sin_port; peer->addr.sin_port = 0; } } } else { /* Non-dynamic. Make sure we become that way if we're not */ if (peer->expire > -1) ast_sched_del(sched, peer->expire); peer->expire = -1; peer->dynamic = 0; if (ast_get_ip(&peer->addr, v->value)) { free(peer); return NULL; } } if (!maskfound) inet_aton("255.255.255.255", &peer->mask); } else if (!strcasecmp(v->name, "defaultip")) { if (ast_get_ip(&peer->defaddr, v->value)) { free(peer); return NULL; } } else if (!strcasecmp(v->name, "permit") || !strcasecmp(v->name, "deny")) { peer->ha = ast_append_ha(v->name, v->value, peer->ha); } else if (!strcasecmp(v->name, "mask")) { maskfound++; inet_aton(v->value, &peer->mask); } else if (!strcasecmp(v->name, "port")) { if (peer->dynamic) peer->defaddr.sin_port = htons(atoi(v->value)); else peer->addr.sin_port = htons(atoi(v->value)); } else if (!strcasecmp(v->name, "username")) { strncpy(peer->username, v->value, sizeof(peer->username)-1); } else if (!strcasecmp(v->name, "mailbox")) { strncpy(peer->mailbox, v->value, sizeof(peer->mailbox)-1); } else if (!strcasecmp(v->name, "allow")) { format = ast_getformatbyname(v->value); if (format < 1) ast_log(LOG_WARNING, "Cannot allow unknown format '%s'\n", v->value); else peer->capability |= format; } else if (!strcasecmp(v->name, "callgroup")) { peer->callgroup = ast_get_group(v->value); } else if (!strcasecmp(v->name, "pickupgroup")) { peer->pickupgroup = ast_get_group(v->value); } else if (!strcasecmp(v->name, "disallow")) { format = ast_getformatbyname(v->value); if (format < 1) ast_log(LOG_WARNING, "Cannot disallow unknown format '%s'\n", v->value); else peer->capability &= ~format; } else if (!strcasecmp(v->name, "insecure")) { peer->insecure = ast_true(v->value); } else if (!strcasecmp(v->name, "qualify")) { if (!strcasecmp(v->value, "no")) { peer->maxms = 0; } else if (!strcasecmp(v->value, "yes")) { peer->maxms = DEFAULT_MAXMS; } else if (sscanf(v->value, "%d", &peer->maxms) != 1) { ast_log(LOG_WARNING, "Qualification of peer '%s' should be 'yes', 'no', or a number of milliseconds at line %d of iax.conf\n", peer->name, v->lineno); peer->maxms = 0; } } //else if (strcasecmp(v->name,"type")) // ast_log(LOG_WARNING, "Ignoring %s\n", v->name); v=v->next; } if (!strlen(peer->methods)) strcpy(peer->methods, "md5,plaintext"); peer->delme = 0; } return peer; } static int reload_config(void) { struct ast_config *cfg; struct ast_variable *v; struct sip_peer *peer; struct sip_user *user; char *cat; char *utype; struct hostent *hp; int format; int oldport = ntohs(bindaddr.sin_port); globaldtmfmode = SIP_DTMF_RFC2833; if (gethostname(ourhost, sizeof(ourhost))) { ast_log(LOG_WARNING, "Unable to get hostname, SIP disabled\n"); return 0; } cfg = ast_load(config); /* We *must* have a config file otherwise stop immediately */ if (!cfg) { ast_log(LOG_NOTICE, "Unable to load config %s, SIP disabled\n", config); return 0; } globalnat = 0; sip_prefs_free(); memset(&bindaddr, 0, sizeof(bindaddr)); /* Initialize some reasonable defaults */ strncpy(context, "default", sizeof(context) - 1); strcpy(language, ""); strcpy(fromdomain, ""); v = ast_variable_browse(cfg, "general"); while(v) { /* Create the interface list */ if (!strcasecmp(v->name, "context")) { strncpy(context, v->value, sizeof(context)-1); } else if (!strcasecmp(v->name, "dtmfmode")) { if (!strcasecmp(v->value, "inband")) globaldtmfmode=SIP_DTMF_INBAND; else if (!strcasecmp(v->value, "rfc2833")) globaldtmfmode = SIP_DTMF_RFC2833; else if (!strcasecmp(v->value, "info")) globaldtmfmode = SIP_DTMF_INFO; else { ast_log(LOG_WARNING, "Unknown dtmf mode '%s', using rfc2833\n", v->value); globaldtmfmode = SIP_DTMF_RFC2833; } } else if (!strcasecmp(v->name, "language")) { strncpy(language, v->value, sizeof(language)-1); } else if (!strcasecmp(v->name, "callerid")) { strncpy(callerid, v->value, sizeof(callerid)-1); } else if (!strcasecmp(v->name, "fromdomain")) { strncpy(fromdomain, v->value, sizeof(fromdomain)-1); } else if (!strcasecmp(v->name, "nat")) { globalnat = ast_true(v->value); } else if (!strcasecmp(v->name, "maxexpirey") || !strcasecmp(v->name, "maxexpiry")) { max_expiry = atoi(v->value); if (max_expiry < 1) max_expiry = DEFAULT_MAX_EXPIRY; } else if (!strcasecmp(v->name, "defaultexpiry")) { default_expiry = atoi(v->value); if (default_expiry < 1) default_expiry = DEFAULT_DEFAULT_EXPIRY; } else if (!strcasecmp(v->name, "bindaddr")) { if (!(hp = gethostbyname(v->value))) { ast_log(LOG_WARNING, "Invalid address: %s\n", v->value); } else { memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr)); } } else if (!strcasecmp(v->name, "allow")) { format = ast_getformatbyname(v->value); if (format < 1) ast_log(LOG_WARNING, "Cannot allow unknown format '%s'\n", v->value); else { capability |= format; sip_pref_append(format); } } else if (!strcasecmp(v->name, "disallow")) { format = ast_getformatbyname(v->value); if (format < 1) ast_log(LOG_WARNING, "Cannot disallow unknown format '%s'\n", v->value); else { capability &= ~format; sip_pref_remove(format); } } else if (!strcasecmp(v->name, "register")) { sip_register(v->value, v->lineno); } else if (!strcasecmp(v->name, "tos")) { if (sscanf(v->value, "%i", &format) == 1) tos = format & 0xff; else if (!strcasecmp(v->value, "lowdelay")) tos = IPTOS_LOWDELAY; else if (!strcasecmp(v->value, "throughput")) tos = IPTOS_THROUGHPUT; else if (!strcasecmp(v->value, "reliability")) tos = IPTOS_RELIABILITY; else if (!strcasecmp(v->value, "mincost")) tos = IPTOS_MINCOST; else if (!strcasecmp(v->value, "none")) tos = 0; else ast_log(LOG_WARNING, "Invalid tos value at line %d, should be 'lowdelay', 'throughput', 'reliability', 'mincost', or 'none'\n", v->lineno); } else if (!strcasecmp(v->name, "port")) { if (sscanf(v->value, "%i", &ourport) == 1) { bindaddr.sin_port = htons(ourport); } else { ast_log(LOG_WARNING, "Invalid port number '%s' at line %d of %s\n", v->value, v->lineno, config); } } //else if (strcasecmp(v->name,"type")) // ast_log(LOG_WARNING, "Ignoring %s\n", v->name); v = v->next; } cat = ast_category_browse(cfg, NULL); while(cat) { if (strcasecmp(cat, "general")) { utype = ast_variable_retrieve(cfg, cat, "type"); if (utype) { if (!strcasecmp(utype, "user") || !strcasecmp(utype, "friend")) { user = build_user(cat, ast_variable_browse(cfg, cat)); if (user) { ast_pthread_mutex_lock(&userl.lock); user->next = userl.users; userl.users = user; ast_pthread_mutex_unlock(&userl.lock); } } if (!strcasecmp(utype, "peer") || !strcasecmp(utype, "friend")) { peer = build_peer(cat, ast_variable_browse(cfg, cat)); if (peer) { ast_pthread_mutex_lock(&peerl.lock); peer->next = peerl.peers; peerl.peers = peer; ast_pthread_mutex_unlock(&peerl.lock); } } else if (strcasecmp(utype, "user")) { ast_log(LOG_WARNING, "Unknown type '%s' for '%s' in %s\n", utype, cat, "sip.conf"); } } else ast_log(LOG_WARNING, "Section '%s' lacks type\n", cat); } cat = ast_category_browse(cfg, cat); } if (ntohl(bindaddr.sin_addr.s_addr)) { memcpy(&__ourip, &bindaddr, sizeof(__ourip)); } else { hp = gethostbyname(ourhost); if (!hp) { ast_log(LOG_WARNING, "Unable to get IP address for %s, SIP disabled\n", ourhost); return 0; } memcpy(&__ourip, hp->h_addr, sizeof(__ourip)); } if (!ntohs(bindaddr.sin_port)) bindaddr.sin_port = ntohs(DEFAULT_SIP_PORT); bindaddr.sin_family = AF_INET; pthread_mutex_lock(&netlock); if ((sipsock > -1) && (ntohs(bindaddr.sin_port) != oldport)) { close(sipsock); sipsock = -1; } if (sipsock < 0) { sipsock = socket(AF_INET, SOCK_DGRAM, 0); if (sipsock < 0) { ast_log(LOG_WARNING, "Unable to create SIP socket: %s\n", strerror(errno)); } else { // Allow SIP clients on the same host to access us: const int reuseFlag = 1; setsockopt(sipsock, SOL_SOCKET, SO_REUSEADDR, (const char*)&reuseFlag, sizeof reuseFlag); if (bind(sipsock, (struct sockaddr *)&bindaddr, sizeof(bindaddr)) < 0) { ast_log(LOG_WARNING, "Failed to bind to %s:%d: %s\n", inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port), strerror(errno)); close(sipsock); sipsock = -1; } else if (option_verbose > 1) { ast_verbose(VERBOSE_PREFIX_2 "SIP Listening on %s:%d\n", inet_ntoa(bindaddr.sin_addr), ntohs(bindaddr.sin_port)); if (option_verbose > 1) ast_verbose(VERBOSE_PREFIX_2 "Using TOS bits %d\n", tos); if (setsockopt(sipsock, SOL_IP, IP_TOS, &tos, sizeof(tos))) ast_log(LOG_WARNING, "Unable to set TOS to %d\n", tos); } } } pthread_mutex_unlock(&netlock); ast_destroy(cfg); return 0; } static struct ast_rtp *sip_get_rtp_peer(struct ast_channel *chan) { struct sip_pvt *p; p = chan->pvt->pvt; if (p && p->rtp && p->canreinvite) return p->rtp; return NULL; } static int sip_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp) { struct sip_pvt *p; p = chan->pvt->pvt; if (p) { transmit_reinvite_with_sdp(p, rtp); p->outgoing = 1; return 0; } return -1; } static struct ast_rtp_protocol sip_rtp = { get_rtp_info: sip_get_rtp_peer, set_rtp_peer: sip_set_rtp_peer, }; int load_module() { int res; struct sip_peer *peer; struct sip_registry *reg; res = reload_config(); if (!res) { /* Make sure we can register our sip channel type */ if (ast_channel_register_ex(type, tdesc, capability, sip_request, sip_devicestate)) { ast_log(LOG_ERROR, "Unable to register channel class %s\n", type); return -1; } ast_cli_register(&cli_show_users); ast_cli_register(&cli_show_channels); ast_cli_register(&cli_show_channel); ast_cli_register(&cli_show_peers); ast_cli_register(&cli_show_registry); ast_cli_register(&cli_debug); ast_cli_register(&cli_no_debug); sip_rtp.type = type; ast_rtp_proto_register(&sip_rtp); sched = sched_context_create(); if (!sched) { ast_log(LOG_WARNING, "Unable to create schedule context\n"); } io = io_context_create(); if (!io) { ast_log(LOG_WARNING, "Unable to create I/O context\n"); } ast_pthread_mutex_lock(&peerl.lock); for (peer = peerl.peers; peer; peer = peer->next) sip_poke_peer(peer); for (reg = registrations; reg; reg = reg->next) sip_do_register(reg); ast_pthread_mutex_unlock(&peerl.lock); /* And start the monitor for the first time */ restart_monitor(); } return res; } void delete_users(void) { struct sip_user *user, *userlast; struct sip_peer *peer; struct sip_registry *reg, *regl; /* Delete all users */ ast_pthread_mutex_lock(&userl.lock); for (user=userl.users;user;) { ast_free_ha(user->ha); userlast = user; user=user->next; free(userlast); } userl.users=NULL; ast_pthread_mutex_unlock(&userl.lock); for (reg = registrations;reg;) { regl = reg; reg = reg->next; if (regl->expire > -1) ast_sched_del(sched, regl->expire); free(regl); } registrations = NULL; ast_pthread_mutex_lock(&peerl.lock); for (peer=peerl.peers;peer;) { /* Assume all will be deleted, and we'll find out for sure later */ peer->delme = 1; peer = peer->next; } ast_pthread_mutex_unlock(&peerl.lock); } void prune_peers(void) { /* Prune peers who still are supposed to be deleted */ struct sip_peer *peer, *peerlast, *peernext; ast_pthread_mutex_lock(&peerl.lock); peerlast = NULL; for (peer=peerl.peers;peer;) { peernext = peer->next; if (peer->delme) { /* Delete it, it needs to disappear */ if (peer->call) sip_destroy(peer->call); if (peer->expire > -1) ast_sched_del(sched, peer->expire); if (peer->pokeexpire > -1) ast_sched_del(sched, peer->pokeexpire); free(peer); if (peerlast) peerlast->next = peernext; else peerl.peers = peernext; } else peerlast = peer; peer=peernext; } ast_pthread_mutex_unlock(&peerl.lock); } int reload(void) { struct sip_registry *reg; struct sip_peer *peer; delete_users(); reload_config(); prune_peers(); /* And start the monitor for the first time */ restart_monitor(); for (reg = registrations; reg; reg = reg->next) sip_do_register(reg); ast_pthread_mutex_lock(&peerl.lock); for (peer = peerl.peers; peer; peer = peer->next) sip_poke_peer(peer); ast_pthread_mutex_unlock(&peerl.lock); return 0; } int unload_module() { struct sip_pvt *p, *pl; /* First, take us out of the channel loop */ ast_channel_unregister(type); if (!ast_pthread_mutex_lock(&iflock)) { /* Hangup all interfaces if they have an owner */ p = iflist; while(p) { if (p->owner) ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD); p = p->next; } iflist = NULL; ast_pthread_mutex_unlock(&iflock); } else { ast_log(LOG_WARNING, "Unable to lock the monitor\n"); return -1; } if (!ast_pthread_mutex_lock(&monlock)) { if (monitor_thread) { pthread_cancel(monitor_thread); pthread_kill(monitor_thread, SIGURG); pthread_join(monitor_thread, NULL); } monitor_thread = -2; ast_pthread_mutex_unlock(&monlock); } else { ast_log(LOG_WARNING, "Unable to lock the monitor\n"); return -1; } if (!ast_pthread_mutex_lock(&iflock)) { /* Destroy all the interfaces and free their memory */ p = iflist; while(p) { pl = p; p = p->next; /* Free associated memory */ free(pl); } iflist = NULL; ast_pthread_mutex_unlock(&iflock); } else { ast_log(LOG_WARNING, "Unable to lock the monitor\n"); return -1; } return 0; } int usecount() { int res; ast_pthread_mutex_lock(&usecnt_lock); res = usecnt; ast_pthread_mutex_unlock(&usecnt_lock); return res; } char *key() { return ASTERISK_GPL_KEY; } char *description() { return desc; } char *getsipuri(char *header) { char *c, *d, *retval; int n; if (!(c=strstr(header, "sip"))) { return NULL; } if (!(d=strchr(c, '@'))) { return NULL; } n=d-c; retval=(char *)malloc(n+1); strncpy(retval, c, n); *(retval+n)='\0'; return retval; }