diff options
Diffstat (limited to 'channels/iax2-provision.c')
-rwxr-xr-x | channels/iax2-provision.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/channels/iax2-provision.c b/channels/iax2-provision.c new file mode 100755 index 000000000..61190c2c3 --- /dev/null +++ b/channels/iax2-provision.c @@ -0,0 +1,504 @@ +/* + * IAX Provisioning Protocol + * + * Asterisk Interface + * + * Copyright (C) 2004 Digium, Inc. + * + * Mark Spencer <markster@digium.com> + * + * This program is free software, distributed under the terms of + * the GNU General Public License + * + */ + +#include <asterisk/config.h> +#include <asterisk/logger.h> +#include <asterisk/cli.h> +#include <asterisk/lock.h> +#include <asterisk/utils.h> +#include <asterisk/frame.h> +#include <asterisk/options.h> +#include <asterisk/md5.h> +#include <asterisk/astdb.h> +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <sys/socket.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <netdb.h> +#include "iax2.h" +#include "iax2-provision.h" +#include "iax2-parser.h" + +static int provinit = 0; + +struct iax_template { + int dead; + char name[80]; + char src[80]; + struct iax_template *next; + char user[20]; + char pass[20]; + char lang[10]; + unsigned short port; + unsigned int server; + unsigned short serverport; + unsigned int altserver; + unsigned int flags; + unsigned int format; + int tos; +} *templates; + +static struct iax_flag { + char *name; + int value; +} iax_flags[] = { + { "register", PROV_FLAG_REGISTER }, + { "secure", PROV_FLAG_SECURE }, + { "heartbeat", PROV_FLAG_HEARTBEAT }, + { "debug", PROV_FLAG_DEBUG }, +}; + +char *iax_provflags2str(char *buf, int buflen, unsigned int flags) +{ + int x; + strcpy(buf, ""); + for (x=0;x<sizeof(iax_flags) / sizeof(iax_flags[0]); x++) { + if (flags & iax_flags[x].value){ + strcat(buf, iax_flags[x].name); + strcat(buf, ","); + } + } + if (strlen(buf)) + buf[strlen(buf) - 1] = '\0'; + else + strcpy(buf, "none"); + return buf; +} + +static unsigned int iax_str2flags(const char *buf) +{ + int x; + int len; + int found; + unsigned int flags = 0; + char *e; + while(buf && *buf) { + e = strchr(buf, ','); + if (e) + len = e - buf; + else + len = 0; + found = 0; + for (x=0;x<sizeof(iax_flags) / sizeof(iax_flags[0]); x++) { + if ((len && !strncasecmp(iax_flags[x].name, buf, len)) || + (!len && !strcasecmp(iax_flags[x].name, buf))) { + flags |= iax_flags[x].value; + break; + } + } + if (e) { + buf = e + 1; + while(*buf && (*buf < 33)) + buf++; + } else + break; + } + return flags; +} +AST_MUTEX_DEFINE_STATIC(provlock); + +static struct iax_template *iax_template_find(const char *s, int allowdead) +{ + struct iax_template *cur; + cur = templates; + while(cur) { + if (!strcasecmp(s, cur->name)) { + if (!allowdead && cur->dead) + cur = NULL; + break; + } + cur = cur->next; + } + return cur; +} + +char *iax_prov_complete_template(char *line, char *word, int pos, int state) +{ + struct iax_template *c; + int which=0; + char *ret; + ast_mutex_lock(&provlock); + c = templates; + while(c) { + if (!strncasecmp(word, c->name, strlen(word))) { + if (++which > state) + break; + } + c = c->next; + } + if (c) { + ret = strdup(c->name); + } else + ret = NULL; + ast_mutex_unlock(&provlock); + return ret; +} + +static unsigned int prov_ver_calc(struct iax_ie_data *provdata) +{ + struct MD5Context md5; + unsigned int tmp[4]; + MD5Init(&md5); + MD5Update(&md5, provdata->buf, provdata->pos); + MD5Final((unsigned char *)tmp, &md5); + return tmp[0] ^ tmp[1] ^ tmp[2] ^ tmp[3]; +} + +int iax_provision_build(struct iax_ie_data *provdata, unsigned int *signature, const char *template, int force) +{ + struct iax_template *cur; + unsigned int sig; + char tmp[40]; + memset(provdata, 0, sizeof(*provdata)); + ast_mutex_lock(&provlock); + cur = iax_template_find(template, 1); + /* If no match, try searching for '*' */ + if (!cur) + cur = iax_template_find("*", 1); + if (cur) { + /* found it -- add information elements as appropriate */ + if (force || strlen(cur->user)) + iax_ie_append_str(provdata, PROV_IE_USER, cur->user); + if (force || strlen(cur->pass)) + iax_ie_append_str(provdata, PROV_IE_PASS, cur->pass); + if (force || strlen(cur->lang)) + iax_ie_append_str(provdata, PROV_IE_LANG, cur->lang); + if (force || cur->port) + iax_ie_append_short(provdata, PROV_IE_PORTNO, cur->port); + if (force || cur->server) + iax_ie_append_int(provdata, PROV_IE_SERVERIP, cur->server); + if (force || cur->serverport) + iax_ie_append_short(provdata, PROV_IE_SERVERPORT, cur->serverport); + if (force || cur->altserver) + iax_ie_append_int(provdata, PROV_IE_ALTSERVER, cur->altserver); + if (force || cur->flags) + iax_ie_append_int(provdata, PROV_IE_FLAGS, cur->flags); + if (force || cur->format) + iax_ie_append_int(provdata, PROV_IE_FORMAT, cur->format); + if (force || cur->tos) + iax_ie_append_byte(provdata, PROV_IE_TOS, cur->tos); + + /* Calculate checksum of message so far */ + sig = prov_ver_calc(provdata); + if (signature) + *signature = sig; + /* Store signature */ + iax_ie_append_int(provdata, PROV_IE_PROVVER, sig); + /* Cache signature for later verification so we need not recalculate all this */ + snprintf(tmp, sizeof(tmp), "v0x%08x", sig); + ast_db_put("iax/provisioning/cache", template, tmp); + } else + ast_db_put("iax/provisioning/cache", template, "u"); + ast_mutex_unlock(&provlock); + return cur ? 0 : -1; +} + +int iax_provision_version(unsigned int *version, const char *template, int force) +{ + char tmp[80] = ""; + struct iax_ie_data ied; + int ret=0; + memset(&ied, 0, sizeof(ied)); + + ast_mutex_lock(&provlock); + ast_db_get("iax/provisioning/cache", template, tmp, sizeof(tmp)); + if (sscanf(tmp, "v%x", version) != 1) { + if (strcmp(tmp, "u")) { + ret = iax_provision_build(&ied, version, template, force); + if (ret) + ast_log(LOG_DEBUG, "Unable to create provisioning packet for '%s'\n", template); + } else + ret = -1; + } else if (option_debug) + ast_log(LOG_DEBUG, "Retrieved cached version '%s' = '%08x'\n", tmp, *version); + ast_mutex_unlock(&provlock); + return ret; +} + +static int iax_template_parse(struct iax_template *cur, struct ast_config *cfg, char *s, char *def) +{ + struct ast_variable *v; + int foundportno = 0; + int foundserverportno = 0; + int x; + struct in_addr ia; + struct hostent *hp; + struct ast_hostent h; + struct iax_template *src, tmp; + char *t; + if (def) { + t = ast_variable_retrieve(cfg, s ,"template"); + src = NULL; + if (t && strlen(t)) { + src = iax_template_find(t, 0); + if (!src) + ast_log(LOG_WARNING, "Unable to find base template '%s' for creating '%s'. Trying '%s'\n", t, s, def); + else + def = t; + } + if (!src) { + src = iax_template_find(def, 0); + if (!src) + ast_log(LOG_WARNING, "Unable to locate default base template '%s' for creating '%s', omitting.", def, s); + } + if (!src) + return -1; + ast_mutex_lock(&provlock); + /* Backup old data */ + memcpy(&tmp, cur, sizeof(tmp)); + /* Restore from src */ + memcpy(cur, src, sizeof(tmp)); + /* Restore important headers */ + memcpy(cur->name, tmp.name, sizeof(cur->name)); + cur->dead = tmp.dead; + cur->next = tmp.next; + ast_mutex_unlock(&provlock); + } + if (def) + strncpy(cur->src, def, sizeof(cur->src) - 1); + else + strcpy(cur->src, ""); + v = ast_variable_browse(cfg, s); + while(v) { + if (!strcasecmp(v->name, "port") || !strcasecmp(v->name, "serverport")) { + if ((sscanf(v->value, "%i", &x) == 1) && (x > 0) && (x < 65535)) { + if (!strcasecmp(v->name, "port")) { + cur->port = x; + foundportno = 1; + } else { + cur->serverport = x; + foundserverportno = 0; + } + } else + ast_log(LOG_WARNING, "Ignoring invalid %s '%s' for '%s' at line %d\n", v->name, v->value, s, v->lineno); + } else if (!strcasecmp(v->name, "server") || !strcasecmp(v->name, "altserver")) { + hp = ast_gethostbyname(v->value, &h); + if (hp) { + memcpy(&ia, hp->h_addr, sizeof(ia)); + if (!strcasecmp(v->name, "server")) + cur->server = ntohl(ia.s_addr); + else + cur->altserver = ntohl(ia.s_addr); + } else + ast_log(LOG_WARNING, "Ignoring invalid %s '%s' for '%s' at line %d\n", v->name, v->value, s, v->lineno); + } else if (!strcasecmp(v->name, "codec")) { + if ((x = ast_getformatbyname(v->value)) > 0) { + cur->format = x; + } else + ast_log(LOG_WARNING, "Ignoring invalid codec '%s' for '%s' at line %d\n", v->value, s, v->lineno); + } else if (!strcasecmp(v->name, "tos")) { + if (sscanf(v->value, "%i", &x) == 1) + cur->tos = x & 0xff; + else if (!strcasecmp(v->value, "lowdelay")) + cur->tos = IPTOS_LOWDELAY; + else if (!strcasecmp(v->value, "throughput")) + cur->tos = IPTOS_THROUGHPUT; + else if (!strcasecmp(v->value, "reliability")) + cur->tos = IPTOS_RELIABILITY; + else if (!strcasecmp(v->value, "mincost")) + cur->tos = IPTOS_MINCOST; + else if (!strcasecmp(v->value, "none")) + cur->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, "user")) { + strncpy(cur->user, v->value, sizeof(cur->user) - 1); + if (strcmp(cur->user, v->value)) + ast_log(LOG_WARNING, "Truncating username from '%s' to '%s' for '%s' at line %d\n", v->value, cur->user, s, v->lineno); + } else if (!strcasecmp(v->name, "pass")) { + strncpy(cur->pass, v->value, sizeof(cur->pass) - 1); + if (strcmp(cur->pass, v->value)) + ast_log(LOG_WARNING, "Truncating password from '%s' to '%s' for '%s' at line %d\n", v->value, cur->pass, s, v->lineno); + } else if (!strcasecmp(v->name, "language")) { + strncpy(cur->lang, v->value, sizeof(cur->lang) - 1); + if (strcmp(cur->lang, v->value)) + ast_log(LOG_WARNING, "Truncating language from '%s' to '%s' for '%s' at line %d\n", v->value, cur->lang, s, v->lineno); + } else if (!strcasecmp(v->name, "flags")) { + cur->flags = iax_str2flags(v->value); + } else if (!strncasecmp(v->name, "flags", 5) && strchr(v->name, '+')) { + cur->flags |= iax_str2flags(v->value); + } else if (!strncasecmp(v->name, "flags", 5) && strchr(v->name, '-')) { + cur->flags &= ~iax_str2flags(v->value); + } else if (strcasecmp(v->name, "template")) { + ast_log(LOG_WARNING, "Unknown keyword '%s' in definition of '%s' at line %d\n", v->name, s, v->lineno); + } + v = v->next; + } + if (!foundportno) + cur->port = IAX_DEFAULT_PORTNO; + if (!foundserverportno) + cur->serverport = IAX_DEFAULT_PORTNO; + return 0; +} + +static int iax_process_template(struct ast_config *cfg, char *s, char *def) +{ + /* Find an already existing one if there */ + struct iax_template *cur; + int mallocd = 0; + cur = templates; + while(cur) { + if (!strcasecmp(cur->name, s)) + break; + cur = cur->next; + } + if (!cur) { + mallocd = 1; + cur = malloc(sizeof(struct iax_template)); + if (!cur) { + ast_log(LOG_WARNING, "Out of memory!\n"); + return -1; + } + /* Initialize entry */ + memset(cur, 0, sizeof(*cur)); + strncpy(cur->name, s, sizeof(cur->name) - 1); + cur->dead = 1; + } + if (!iax_template_parse(cur, cfg, s, def)) + cur->dead = 0; + + /* Link if we're mallocd */ + if (mallocd) { + ast_mutex_lock(&provlock); + cur->next = templates; + templates = cur; + ast_mutex_unlock(&provlock); + } + return 0; +} + +static char show_provisioning_usage[] = +"Usage: iax show provisioning [template]\n" +" Lists all known IAX provisioning templates or a\n" +" specific one if specified.\n"; + +static const char *ifthere(const char *s) +{ + if (strlen(s)) + return s; + else + return "<unspecified>"; +} + +static const char *iax_server(char *a, int alen, unsigned int addr) +{ + struct in_addr ia; + if (!addr) + return "<unspecified>"; + ia.s_addr = htonl(addr); + return ast_inet_ntoa(a, alen, ia); +} + + +static int iax_show_provisioning(int fd, int argc, char *argv[]) +{ + struct iax_template *cur; + char iabuf[80]; /* Has to be big enough for 'flags' too */ + int found = 0; + if ((argc != 3) && (argc != 4)) + return RESULT_SHOWUSAGE; + ast_mutex_lock(&provlock); + for (cur = templates;cur;cur = cur->next) { + if ((argc == 3) || (!strcasecmp(argv[3], cur->name))) { + if (found) ast_cli(fd, "\n"); + ast_cli(fd, "== %s ==\n", cur->name); + ast_cli(fd, "Base Templ: %s\n", strlen(cur->src) ? cur->src : "<none>"); + ast_cli(fd, "Username: %s\n", ifthere(cur->user)); + ast_cli(fd, "Secret: %s\n", ifthere(cur->pass)); + ast_cli(fd, "Language: %s\n", ifthere(cur->lang)); + ast_cli(fd, "Bind Port: %d\n", cur->port); + ast_cli(fd, "Server: %s\n", iax_server(iabuf, sizeof(iabuf), cur->server)); + ast_cli(fd, "Server Port: %d\n", cur->serverport); + ast_cli(fd, "Alternate: %s\n", iax_server(iabuf, sizeof(iabuf), cur->altserver)); + ast_cli(fd, "Flags: %s\n", iax_provflags2str(iabuf, sizeof(iabuf), cur->flags)); + ast_cli(fd, "Format: %s\n", ast_getformatname(cur->format)); + ast_cli(fd, "TOS: %d\n", cur->tos); + found++; + } + } + ast_mutex_unlock(&provlock); + if (!found) { + if (argc == 3) + ast_cli(fd, "No provisioning templates found\n"); + else + ast_cli(fd, "No provisioning template matching '%s' found\n", argv[3]); + } + return RESULT_SUCCESS; +} + +static struct ast_cli_entry cli_show_provisioning = + { { "iax2", "show", "provisioning", NULL }, iax_show_provisioning, "Show iax provisioning", show_provisioning_usage, iax_prov_complete_template }; + +static int iax_provision_init(void) +{ + ast_cli_register(&cli_show_provisioning); + provinit = 1; + return 0; +} + +int iax_provision_reload(void) +{ + struct ast_config *cfg; + struct iax_template *cur, *prev, *next; + char *cat; + int found = 0; + if (!provinit) + iax_provision_init(); + /* Mark all as dead. No need for locking */ + cur = templates; + while(cur) { + cur->dead = 1; + cur = cur->next; + } + cfg = ast_load("iaxprov.conf"); + if (cfg) { + /* Load as appropriate */ + cat = ast_category_browse(cfg, NULL); + while(cat) { + if (strcasecmp(cat, "general")) { + iax_process_template(cfg, cat, found ? "default" : NULL); + found++; + if (option_verbose > 2) + ast_verbose(VERBOSE_PREFIX_3 "Loaded provisioning template '%s'\n", cat); + } + cat = ast_category_browse(cfg, cat); + } + } else + ast_log(LOG_NOTICE, "No IAX provisioning configuration found, IAX provisioning disabled.\n"); + ast_mutex_lock(&provlock); + /* Drop dead entries while locked */ + prev = NULL; + cur = templates; + while(cur) { + next = cur->next; + if (cur->dead) { + if (prev) + prev->next = next; + else + templates = next; + free(cur); + } else + prev = cur; + cur = next; + } + ast_mutex_unlock(&provlock); + /* Purge cached signature DB entries */ + ast_db_deltree("iax/provisioning/cache", NULL); + return 0; + +} |