diff options
Diffstat (limited to 'src/libmsc/smpp_smsc.c')
-rw-r--r-- | src/libmsc/smpp_smsc.c | 1030 |
1 files changed, 1030 insertions, 0 deletions
diff --git a/src/libmsc/smpp_smsc.c b/src/libmsc/smpp_smsc.c new file mode 100644 index 000000000..48a119261 --- /dev/null +++ b/src/libmsc/smpp_smsc.c @@ -0,0 +1,1030 @@ +/* SMPP 3.4 interface, SMSC-side implementation */ +/* (C) 2012 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + + +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <stdint.h> +#include <errno.h> +#include <limits.h> + +#include <sys/socket.h> +#include <netinet/in.h> + +#include <smpp34.h> +#include <smpp34_structs.h> +#include <smpp34_params.h> + +#include <osmocom/core/utils.h> +#include <osmocom/core/socket.h> +#include <osmocom/core/msgb.h> +#include <osmocom/core/logging.h> +#include <osmocom/core/write_queue.h> +#include <osmocom/core/talloc.h> + +#include "smpp_smsc.h" + +#include <openbsc/debug.h> +#include <openbsc/gsm_data.h> + +/*! \brief Ugly wrapper. libsmpp34 should do this itself! */ +#define SMPP34_UNPACK(rc, type, str, data, len) \ + memset(str, 0, sizeof(*str)); \ + rc = smpp34_unpack(type, str, data, len) + +enum emse_bind { + ESME_BIND_RX = 0x01, + ESME_BIND_TX = 0x02, +}; + +const struct value_string smpp_status_strs[] = { + { ESME_ROK, "No Error" }, + { ESME_RINVMSGLEN, "Message Length is invalid" }, + { ESME_RINVCMDLEN, "Command Length is invalid" }, + { ESME_RINVCMDID, "Invalid Command ID" }, + { ESME_RINVBNDSTS, "Incorrect BIND Status for given command" }, + { ESME_RALYBND, "ESME Already in Bound State" }, + { ESME_RINVPRTFLG, "Invalid Priority Flag" }, + { ESME_RINVREGDLVFLG, "Invalid Registered Delivery Flag" }, + { ESME_RSYSERR, "System Error" }, + { ESME_RINVSRCADR, "Invalid Source Address" }, + { ESME_RINVDSTADR, "Invalid Destination Address" }, + { ESME_RINVMSGID, "Message ID is invalid" }, + { ESME_RBINDFAIL, "Bind failed" }, + { ESME_RINVPASWD, "Invalid Password" }, + { ESME_RINVSYSID, "Invalid System ID" }, + { ESME_RCANCELFAIL, "Cancel SM Failed" }, + { ESME_RREPLACEFAIL, "Replace SM Failed" }, + { ESME_RMSGQFUL, "Message Queue Full" }, + { ESME_RINVSERTYP, "Invalid Service Type" }, + { ESME_RINVNUMDESTS, "Invalid number of destinations" }, + { ESME_RINVDLNAME, "Invalid Distribution List name" }, + { ESME_RINVDESTFLAG, "Destination flag is invalid" }, + { ESME_RINVSUBREP, "Invalid submit with replace request" }, + { ESME_RINVESMCLASS, "Invalid esm_class field data" }, + { ESME_RCNTSUBDL, "Cannot Submit to Distribution List" }, + { ESME_RSUBMITFAIL, "submit_sm or submit_multi failed" }, + { ESME_RINVSRCTON, "Invalid Source address TON" }, + { ESME_RINVSRCNPI, "Invalid Sourec address NPI" }, + { ESME_RINVDSTTON, "Invalid Destination address TON" }, + { ESME_RINVDSTNPI, "Invalid Desetination address NPI" }, + { ESME_RINVSYSTYP, "Invalid system_type field" }, + { ESME_RINVREPFLAG, "Invalid replace_if_present field" }, + { ESME_RINVNUMMSGS, "Invalid number of messages" }, + { ESME_RTHROTTLED, "Throttling error (ESME has exceeded message limits)" }, + { ESME_RINVSCHED, "Invalid Scheduled Delivery Time" }, + { ESME_RINVEXPIRY, "Invalid message validity period (Expiry time)" }, + { ESME_RINVDFTMSGID, "Predefined Message Invalid or Not Found" }, + { ESME_RX_T_APPN, "ESME Receiver Temporary App Error Code" }, + { ESME_RX_P_APPN, "ESME Receiver Permanent App Error Code" }, + { ESME_RX_R_APPN, "ESME Receiver Reject Message Error Code" }, + { ESME_RQUERYFAIL, "query_sm request failed" }, + { ESME_RINVOPTPARSTREAM,"Error in the optional part of the PDU Body" }, + { ESME_ROPTPARNOTALLWD, "Optional Parameter not allowed" }, + { ESME_RINVPARLEN, "Invalid Parameter Length" }, + { ESME_RMISSINGOPTPARAM,"Expected Optional Parameter missing" }, + { ESME_RINVOPTPARAMVAL, "Invalid Optional Parameter Value" }, + { ESME_RDELIVERYFAILURE,"Delivery Failure (used for data_sm_resp)" }, + { ESME_RUNKNOWNERR, "Unknown Error" }, + { 0, NULL } +}; + +/*! \brief compare if two SMPP addresses are equal */ +int smpp_addr_eq(const struct osmo_smpp_addr *a, + const struct osmo_smpp_addr *b) +{ + if (a->ton == b->ton && + a->npi == b->npi && + !strcmp(a->addr, b->addr)) + return 1; + + return 0; +} + + +struct osmo_smpp_acl *smpp_acl_by_system_id(struct smsc *smsc, + const char *sys_id) +{ + struct osmo_smpp_acl *acl; + + llist_for_each_entry(acl, &smsc->acl_list, list) { + if (!strcmp(acl->system_id, sys_id)) + return acl; + } + + return NULL; +} + +struct osmo_smpp_acl *smpp_acl_alloc(struct smsc *smsc, const char *sys_id) +{ + struct osmo_smpp_acl *acl; + + if (strlen(sys_id) > SMPP_SYS_ID_LEN) + return NULL; + + if (smpp_acl_by_system_id(smsc, sys_id)) + return NULL; + + acl = talloc_zero(smsc, struct osmo_smpp_acl); + if (!acl) + return NULL; + + acl->smsc = smsc; + strcpy(acl->system_id, sys_id); + INIT_LLIST_HEAD(&acl->route_list); + + llist_add_tail(&acl->list, &smsc->acl_list); + + return acl; +} + +void smpp_acl_delete(struct osmo_smpp_acl *acl) +{ + struct osmo_smpp_route *r, *r2; + + llist_del(&acl->list); + + /* kill any active ESMEs */ + if (acl->esme) { + struct osmo_esme *esme = acl->esme; + osmo_fd_unregister(&esme->wqueue.bfd); + close(esme->wqueue.bfd.fd); + esme->wqueue.bfd.fd = -1; + esme->acl = NULL; + smpp_esme_put(esme); + } + + /* delete all routes for this ACL */ + llist_for_each_entry_safe(r, r2, &acl->route_list, list) { + llist_del(&r->list); + llist_del(&r->global_list); + talloc_free(r); + } + + talloc_free(acl); +} + +static struct osmo_smpp_route *route_alloc(struct osmo_smpp_acl *acl) +{ + struct osmo_smpp_route *r; + + r = talloc_zero(acl, struct osmo_smpp_route); + if (!r) + return NULL; + + llist_add_tail(&r->list, &acl->route_list); + llist_add_tail(&r->global_list, &acl->smsc->route_list); + + return r; +} + +int smpp_route_pfx_add(struct osmo_smpp_acl *acl, + const struct osmo_smpp_addr *pfx) +{ + struct osmo_smpp_route *r; + + llist_for_each_entry(r, &acl->route_list, list) { + if (r->type == SMPP_ROUTE_PREFIX && + smpp_addr_eq(&r->u.prefix, pfx)) + return -EEXIST; + } + + r = route_alloc(acl); + if (!r) + return -ENOMEM; + r->type = SMPP_ROUTE_PREFIX; + r->acl = acl; + memcpy(&r->u.prefix, pfx, sizeof(r->u.prefix)); + + return 0; +} + +int smpp_route_pfx_del(struct osmo_smpp_acl *acl, + const struct osmo_smpp_addr *pfx) +{ + struct osmo_smpp_route *r, *r2; + + llist_for_each_entry_safe(r, r2, &acl->route_list, list) { + if (r->type == SMPP_ROUTE_PREFIX && + smpp_addr_eq(&r->u.prefix, pfx)) { + llist_del(&r->list); + talloc_free(r); + return 0; + } + } + + return -ENODEV; +} + + +/*! \brief increaes the use/reference count */ +void smpp_esme_get(struct osmo_esme *esme) +{ + esme->use++; +} + +static void esme_destroy(struct osmo_esme *esme) +{ + osmo_wqueue_clear(&esme->wqueue); + if (esme->wqueue.bfd.fd >= 0) { + osmo_fd_unregister(&esme->wqueue.bfd); + close(esme->wqueue.bfd.fd); + } + smpp_cmd_flush_pending(esme); + llist_del(&esme->list); + talloc_free(esme); +} + +static uint32_t esme_inc_seq_nr(struct osmo_esme *esme) +{ + esme->own_seq_nr++; + if (esme->own_seq_nr > 0x7fffffff) + esme->own_seq_nr = 1; + + return esme->own_seq_nr; +} + +/*! \brief decrease the use/reference count, free if it is 0 */ +void smpp_esme_put(struct osmo_esme *esme) +{ + esme->use--; + if (esme->use <= 0) + esme_destroy(esme); +} + +/*! \brief try to find a SMPP route (ESME) for given destination */ +struct osmo_esme * +smpp_route(const struct smsc *smsc, const struct osmo_smpp_addr *dest) +{ + struct osmo_smpp_route *r; + struct osmo_smpp_acl *acl = NULL; + + DEBUGP(DSMPP, "Looking up route for (%u/%u/%s)\n", + dest->ton, dest->npi, dest->addr); + + /* search for a specific route */ + llist_for_each_entry(r, &smsc->route_list, global_list) { + switch (r->type) { + case SMPP_ROUTE_PREFIX: + DEBUGP(DSMPP, "Checking prefix route (%u/%u/%s)->%s\n", + r->u.prefix.ton, r->u.prefix.npi, r->u.prefix.addr, + r->acl->system_id); + if (r->u.prefix.ton == dest->ton && + r->u.prefix.npi == dest->npi && + !strncmp(r->u.prefix.addr, dest->addr, + strlen(r->u.prefix.addr))) { + DEBUGP(DSMPP, "Found prefix route ACL\n"); + acl = r->acl; + } + break; + default: + break; + } + + if (acl) + break; + } + + if (!acl) { + /* check for default route */ + if (smsc->def_route) { + DEBUGP(DSMPP, "Using existing default route\n"); + acl = smsc->def_route; + } + } + + if (acl && acl->esme) { + struct osmo_esme *esme; + DEBUGP(DSMPP, "ACL even has ESME, we can route to it!\n"); + esme = acl->esme; + if (esme->bind_flags & ESME_BIND_RX) + return esme; + else + LOGP(DSMPP, LOGL_NOTICE, "[%s] is matching route, " + "but not bound for Rx, discarding MO SMS\n", + esme->system_id); + } + + return NULL; +} + + +/*! \brief initialize the libsmpp34 data structure for a response */ +#define INIT_RESP(type, resp, req) { \ + memset((resp), 0, sizeof(*(resp))); \ + (resp)->command_length = 0; \ + (resp)->command_id = type; \ + (resp)->command_status = ESME_ROK; \ + (resp)->sequence_number = (req)->sequence_number; \ +} + +/*! \brief pack a libsmpp34 data strcutrure and send it to the ESME */ +#define PACK_AND_SEND(esme, ptr) pack_and_send(esme, (ptr)->command_id, ptr) +static int pack_and_send(struct osmo_esme *esme, uint32_t type, void *ptr) +{ + struct msgb *msg = msgb_alloc(4096, "SMPP_Tx"); + int rc, rlen; + if (!msg) + return -ENOMEM; + + rc = smpp34_pack(type, msg->tail, msgb_tailroom(msg), &rlen, ptr); + if (rc != 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error during smpp34_pack(): %s\n", + esme->system_id, smpp34_strerror); + msgb_free(msg); + return -EINVAL; + } + msgb_put(msg, rlen); + + if (osmo_wqueue_enqueue(&esme->wqueue, msg) != 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Write queue full. Dropping message\n", + esme->system_id); + msgb_free(msg); + return -EAGAIN; + } + return 0; +} + +/*! \brief transmit a generic NACK to a remote ESME */ +static int smpp_tx_gen_nack(struct osmo_esme *esme, uint32_t seq, uint32_t status) +{ + struct generic_nack_t nack; + char buf[SMALL_BUFF]; + + nack.command_length = 0; + nack.command_id = GENERIC_NACK; + nack.sequence_number = seq; + nack.command_status = status; + + LOGP(DSMPP, LOGL_ERROR, "[%s] Tx GENERIC NACK: %s\n", + esme->system_id, str_command_status(status, buf)); + + return PACK_AND_SEND(esme, &nack); +} + +/*! \brief retrieve SMPP command ID from a msgb */ +static inline uint32_t smpp_msgb_cmdid(struct msgb *msg) +{ + uint8_t *tmp = msgb_data(msg) + 4; + return ntohl(*(uint32_t *)tmp); +} + +/*! \brief retrieve SMPP sequence number from a msgb */ +static inline uint32_t smpp_msgb_seq(struct msgb *msg) +{ + uint8_t *tmp = msgb_data(msg); + return ntohl(*(uint32_t *)tmp); +} + +/*! \brief handle an incoming SMPP generic NACK */ +static int smpp_handle_gen_nack(struct osmo_esme *esme, struct msgb *msg) +{ + struct generic_nack_t nack; + char buf[SMALL_BUFF]; + int rc; + + SMPP34_UNPACK(rc, GENERIC_NACK, &nack, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + LOGP(DSMPP, LOGL_ERROR, "[%s] Rx GENERIC NACK: %s\n", + esme->system_id, str_command_status(nack.command_status, buf)); + + return 0; +} + +static int _process_bind(struct osmo_esme *esme, uint8_t if_version, + uint32_t bind_flags, const char *sys_id, + const char *passwd) +{ + struct osmo_smpp_acl *acl; + + if (if_version != SMPP_VERSION) + return ESME_RSYSERR; + + if (esme->bind_flags) + return ESME_RALYBND; + + esme->smpp_version = if_version; + snprintf(esme->system_id, sizeof(esme->system_id), "%s", sys_id); + + acl = smpp_acl_by_system_id(esme->smsc, esme->system_id); + if (!esme->smsc->accept_all) { + if (!acl) { + /* This system is unknown */ + return ESME_RINVSYSID; + } else { + if (strlen(acl->passwd) && + strcmp(acl->passwd, passwd)) { + return ESME_RINVPASWD; + } + } + } + if (acl) { + esme->acl = acl; + acl->esme = esme; + } + + esme->bind_flags = bind_flags; + + return ESME_ROK; +} + + +/*! \brief handle an incoming SMPP BIND RECEIVER */ +static int smpp_handle_bind_rx(struct osmo_esme *esme, struct msgb *msg) +{ + struct bind_receiver_t bind; + struct bind_receiver_resp_t bind_r; + int rc; + + SMPP34_UNPACK(rc, BIND_RECEIVER, &bind, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind); + + LOGP(DSMPP, LOGL_INFO, "[%s] Rx BIND Rx from (Version %02x)\n", + bind.system_id, bind.interface_version); + + rc = _process_bind(esme, bind.interface_version, ESME_BIND_RX, + (const char *)bind.system_id, (const char *)bind.password); + bind_r.command_status = rc; + + return PACK_AND_SEND(esme, &bind_r); +} + +/*! \brief handle an incoming SMPP BIND TRANSMITTER */ +static int smpp_handle_bind_tx(struct osmo_esme *esme, struct msgb *msg) +{ + struct bind_transmitter_t bind; + struct bind_transmitter_resp_t bind_r; + struct tlv_t tlv; + int rc; + + SMPP34_UNPACK(rc, BIND_TRANSMITTER, &bind, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind); + + LOGP(DSMPP, LOGL_INFO, "[%s] Rx BIND Tx (Version %02x)\n", + bind.system_id, bind.interface_version); + + rc = _process_bind(esme, bind.interface_version, ESME_BIND_TX, + (const char *)bind.system_id, (const char *)bind.password); + bind_r.command_status = rc; + + /* build response */ + snprintf((char *)bind_r.system_id, sizeof(bind_r.system_id), "%s", + esme->smsc->system_id); + + /* add interface version TLV */ + tlv.tag = TLVID_sc_interface_version; + tlv.length = sizeof(uint8_t); + tlv.value.val16 = esme->smpp_version; + build_tlv(&bind_r.tlv, &tlv); + + return PACK_AND_SEND(esme, &bind_r); +} + +/*! \brief handle an incoming SMPP BIND TRANSCEIVER */ +static int smpp_handle_bind_trx(struct osmo_esme *esme, struct msgb *msg) +{ + struct bind_transceiver_t bind; + struct bind_transceiver_resp_t bind_r; + int rc; + + SMPP34_UNPACK(rc, BIND_TRANSCEIVER, &bind, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + INIT_RESP(BIND_TRANSCEIVER_RESP, &bind_r, &bind); + + LOGP(DSMPP, LOGL_INFO, "[%s] Rx BIND Trx (Version %02x)\n", + bind.system_id, bind.interface_version); + + rc = _process_bind(esme, bind.interface_version, ESME_BIND_RX|ESME_BIND_TX, + (const char *)bind.system_id, (const char *)bind.password); + bind_r.command_status = rc; + + return PACK_AND_SEND(esme, &bind_r); +} + +/*! \brief handle an incoming SMPP UNBIND */ +static int smpp_handle_unbind(struct osmo_esme *esme, struct msgb *msg) +{ + struct unbind_t unbind; + struct unbind_resp_t unbind_r; + int rc; + + SMPP34_UNPACK(rc, UNBIND, &unbind, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + INIT_RESP(UNBIND_RESP, &unbind_r, &unbind); + + LOGP(DSMPP, LOGL_INFO, "[%s] Rx UNBIND\n", esme->system_id); + + if (esme->bind_flags == 0) { + unbind_r.command_status = ESME_RINVBNDSTS; + goto err; + } + + esme->bind_flags = 0; +err: + return PACK_AND_SEND(esme, &unbind_r); +} + +/*! \brief handle an incoming SMPP ENQUIRE LINK */ +static int smpp_handle_enq_link(struct osmo_esme *esme, struct msgb *msg) +{ + struct enquire_link_t enq; + struct enquire_link_resp_t enq_r; + int rc; + + SMPP34_UNPACK(rc, ENQUIRE_LINK, &enq, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + LOGP(DSMPP, LOGL_DEBUG, "[%s] Rx Enquire Link\n", esme->system_id); + + INIT_RESP(ENQUIRE_LINK_RESP, &enq_r, &enq); + + LOGP(DSMPP, LOGL_DEBUG, "[%s] Tx Enquire Link Response\n", esme->system_id); + + return PACK_AND_SEND(esme, &enq_r); +} + +/*! \brief send a SUBMIT-SM RESPONSE to a remote ESME */ +int smpp_tx_submit_r(struct osmo_esme *esme, uint32_t sequence_nr, + uint32_t command_status, char *msg_id) +{ + struct submit_sm_resp_t submit_r; + + memset(&submit_r, 0, sizeof(submit_r)); + submit_r.command_length = 0; + submit_r.command_id = SUBMIT_SM_RESP; + submit_r.command_status = command_status; + submit_r.sequence_number= sequence_nr; + snprintf((char *) submit_r.message_id, sizeof(submit_r.message_id), "%s", msg_id); + + return PACK_AND_SEND(esme, &submit_r); +} + +static const struct value_string smpp_avail_strs[] = { + { 0, "Available" }, + { 1, "Denied" }, + { 2, "Unavailable" }, + { 0, NULL } +}; + +/*! \brief send an ALERT_NOTIFICATION to a remote ESME */ +int smpp_tx_alert(struct osmo_esme *esme, uint8_t ton, uint8_t npi, + const char *addr, uint8_t avail_status) +{ + struct alert_notification_t alert; + struct tlv_t tlv; + + memset(&alert, 0, sizeof(alert)); + alert.command_length = 0; + alert.command_id = ALERT_NOTIFICATION; + alert.command_status = ESME_ROK; + alert.sequence_number = esme_inc_seq_nr(esme); + alert.source_addr_ton = ton; + alert.source_addr_npi = npi; + snprintf((char *)alert.source_addr, sizeof(alert.source_addr), "%s", addr); + + tlv.tag = TLVID_ms_availability_status; + tlv.length = sizeof(uint8_t); + tlv.value.val08 = avail_status; + build_tlv(&alert.tlv, &tlv); + + LOGP(DSMPP, LOGL_DEBUG, "[%s] Tx ALERT_NOTIFICATION (%s/%u/%u): %s\n", + esme->system_id, alert.source_addr, alert.source_addr_ton, + alert.source_addr_npi, + get_value_string(smpp_avail_strs, avail_status)); + + return PACK_AND_SEND(esme, &alert); +} + +/* \brief send a DELIVER-SM message to given ESME */ +int smpp_tx_deliver(struct osmo_esme *esme, struct deliver_sm_t *deliver) +{ + deliver->sequence_number = esme_inc_seq_nr(esme); + + return PACK_AND_SEND(esme, deliver); +} + +/*! \brief handle an incoming SMPP DELIVER-SM RESPONSE */ +static int smpp_handle_deliver_resp(struct osmo_esme *esme, struct msgb *msg) +{ + struct deliver_sm_resp_t deliver_r; + struct osmo_smpp_cmd *cmd; + int rc; + + memset(&deliver_r, 0, sizeof(deliver_r)); + SMPP34_UNPACK(rc, DELIVER_SM_RESP, &deliver_r, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + cmd = smpp_cmd_find_by_seqnum(esme, deliver_r.sequence_number); + if (!cmd) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Rx DELIVER-SM RESP !? (%s)\n", + esme->system_id, get_value_string(smpp_status_strs, + deliver_r.command_status)); + return -1; + } + + if (deliver_r.command_status == ESME_ROK) + smpp_cmd_ack(cmd); + else + smpp_cmd_err(cmd, deliver_r.command_status); + + LOGP(DSMPP, LOGL_INFO, "[%s] Rx DELIVER-SM RESP (%s)\n", + esme->system_id, get_value_string(smpp_status_strs, + deliver_r.command_status)); + + return 0; +} + +/*! \brief handle an incoming SMPP SUBMIT-SM */ +static int smpp_handle_submit(struct osmo_esme *esme, struct msgb *msg) +{ + struct submit_sm_t submit; + struct submit_sm_resp_t submit_r; + int rc; + + memset(&submit, 0, sizeof(submit)); + SMPP34_UNPACK(rc, SUBMIT_SM, &submit, msgb_data(msg), + msgb_length(msg)); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Error in smpp34_unpack():%s\n", + esme->system_id, smpp34_strerror); + return rc; + } + + INIT_RESP(SUBMIT_SM_RESP, &submit_r, &submit); + + if (!(esme->bind_flags & ESME_BIND_TX)) { + submit_r.command_status = ESME_RINVBNDSTS; + return PACK_AND_SEND(esme, &submit_r); + } + + LOGP(DSMPP, LOGL_INFO, "[%s] Rx SUBMIT-SM (%s/%u/%u)\n", + esme->system_id, submit.destination_addr, + submit.dest_addr_ton, submit.dest_addr_npi); + + INIT_RESP(SUBMIT_SM_RESP, &submit_r, &submit); + + rc = handle_smpp_submit(esme, &submit, &submit_r); + if (rc == 0) + return PACK_AND_SEND(esme, &submit_r); + + return rc; +} + +/*! \brief one complete SMPP PDU from the ESME has been received */ +static int smpp_pdu_rx(struct osmo_esme *esme, struct msgb *msg __uses) +{ + uint32_t cmd_id = smpp_msgb_cmdid(msg); + int rc = 0; + + LOGP(DSMPP, LOGL_DEBUG, "[%s] smpp_pdu_rx(%s)\n", esme->system_id, + osmo_hexdump(msgb_data(msg), msgb_length(msg))); + + switch (cmd_id) { + case GENERIC_NACK: + rc = smpp_handle_gen_nack(esme, msg); + break; + case BIND_RECEIVER: + rc = smpp_handle_bind_rx(esme, msg); + break; + case BIND_TRANSMITTER: + rc = smpp_handle_bind_tx(esme, msg); + break; + case BIND_TRANSCEIVER: + rc = smpp_handle_bind_trx(esme, msg); + break; + case UNBIND: + rc = smpp_handle_unbind(esme, msg); + break; + case ENQUIRE_LINK: + rc = smpp_handle_enq_link(esme, msg); + break; + case SUBMIT_SM: + rc = smpp_handle_submit(esme, msg); + break; + case DELIVER_SM_RESP: + rc = smpp_handle_deliver_resp(esme, msg); + break; + case DELIVER_SM: + break; + case DATA_SM: + break; + case CANCEL_SM: + case QUERY_SM: + case REPLACE_SM: + case SUBMIT_MULTI: + LOGP(DSMPP, LOGL_NOTICE, "[%s] Unimplemented PDU Command " + "0x%08x\n", esme->system_id, cmd_id); + break; + default: + LOGP(DSMPP, LOGL_ERROR, "[%s] Unknown PDU Command 0x%08x\n", + esme->system_id, cmd_id); + rc = smpp_tx_gen_nack(esme, smpp_msgb_seq(msg), ESME_RINVCMDID); + break; + } + + return rc; +} + +/* This macro should be called after a call to read() in the read_cb of an + * osmo_fd to properly check for errors. + * rc is the return value of read, err_label is the label to jump to in case of + * an error. The code there should handle closing the connection. + * FIXME: This code should go in libosmocore utils.h so it can be used by other + * projects as well. + * */ +#define OSMO_FD_CHECK_READ(rc, err_label) \ + if (rc < 0) { \ + /* EINTR is a non-fatal error, just try again */ \ + if (errno == EINTR) \ + return 0; \ + goto err_label; \ + } else if (rc == 0) { \ + goto err_label; \ + } + +/* !\brief call-back when per-ESME TCP socket has some data to be read */ +static int esme_link_read_cb(struct osmo_fd *ofd) +{ + struct osmo_esme *esme = ofd->data; + uint32_t len; + uint8_t *lenptr = (uint8_t *) &len; + uint8_t *cur; + struct msgb *msg; + ssize_t rdlen, rc; + + switch (esme->read_state) { + case READ_ST_IN_LEN: + rdlen = sizeof(uint32_t) - esme->read_idx; + rc = read(ofd->fd, lenptr + esme->read_idx, rdlen); + if (rc < 0) + LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %zd (%s)\n", + esme->system_id, rc, strerror(errno)); + OSMO_FD_CHECK_READ(rc, dead_socket); + + esme->read_idx += rc; + + if (esme->read_idx >= sizeof(uint32_t)) { + esme->read_len = ntohl(len); + if (esme->read_len < 8 || esme->read_len > UINT16_MAX) { + LOGP(DSMPP, LOGL_ERROR, "[%s] length invalid %u\n", + esme->system_id, esme->read_len); + goto dead_socket; + } + + msg = msgb_alloc(esme->read_len, "SMPP Rx"); + if (!msg) + return -ENOMEM; + esme->read_msg = msg; + cur = msgb_put(msg, sizeof(uint32_t)); + memcpy(cur, lenptr, sizeof(uint32_t)); + esme->read_state = READ_ST_IN_MSG; + esme->read_idx = sizeof(uint32_t); + } + break; + case READ_ST_IN_MSG: + msg = esme->read_msg; + rdlen = esme->read_len - esme->read_idx; + rc = read(ofd->fd, msg->tail, OSMO_MIN(rdlen, msgb_tailroom(msg))); + if (rc < 0) + LOGP(DSMPP, LOGL_ERROR, "[%s] read returned %zd (%s)\n", + esme->system_id, rc, strerror(errno)); + OSMO_FD_CHECK_READ(rc, dead_socket); + + esme->read_idx += rc; + msgb_put(msg, rc); + + if (esme->read_idx >= esme->read_len) { + rc = smpp_pdu_rx(esme, esme->read_msg); + msgb_free(esme->read_msg); + esme->read_msg = NULL; + esme->read_idx = 0; + esme->read_len = 0; + esme->read_state = READ_ST_IN_LEN; + } + break; + } + + return 0; +dead_socket: + msgb_free(esme->read_msg); + osmo_fd_unregister(&esme->wqueue.bfd); + close(esme->wqueue.bfd.fd); + esme->wqueue.bfd.fd = -1; + smpp_esme_put(esme); + + return 0; +} + +/* call-back of write queue once it wishes to write a message to the socket */ +static int esme_link_write_cb(struct osmo_fd *ofd, struct msgb *msg) +{ + struct osmo_esme *esme = ofd->data; + int rc; + + rc = write(ofd->fd, msgb_data(msg), msgb_length(msg)); + if (rc == 0) { + osmo_fd_unregister(&esme->wqueue.bfd); + close(esme->wqueue.bfd.fd); + esme->wqueue.bfd.fd = -1; + smpp_esme_put(esme); + } else if (rc < msgb_length(msg)) { + LOGP(DSMPP, LOGL_ERROR, "[%s] Short write\n", esme->system_id); + return -1; + } + + return 0; +} + +/* callback for already-accepted new TCP socket */ +static int link_accept_cb(struct smsc *smsc, int fd, + struct sockaddr_storage *s, socklen_t s_len) +{ + struct osmo_esme *esme = talloc_zero(smsc, struct osmo_esme); + if (!esme) { + close(fd); + return -ENOMEM; + } + + INIT_LLIST_HEAD(&esme->smpp_cmd_list); + smpp_esme_get(esme); + esme->own_seq_nr = rand(); + esme_inc_seq_nr(esme); + esme->smsc = smsc; + osmo_wqueue_init(&esme->wqueue, 10); + esme->wqueue.bfd.fd = fd; + esme->wqueue.bfd.data = esme; + esme->wqueue.bfd.when = BSC_FD_READ; + + if (osmo_fd_register(&esme->wqueue.bfd) != 0) { + close(fd); + talloc_free(esme); + return -EIO; + } + + esme->wqueue.read_cb = esme_link_read_cb; + esme->wqueue.write_cb = esme_link_write_cb; + + esme->sa_len = OSMO_MIN(sizeof(esme->sa), s_len); + memcpy(&esme->sa, s, esme->sa_len); + + llist_add_tail(&esme->list, &smsc->esme_list); + + return 0; +} + +/* callback of listening TCP socket */ +static int smsc_fd_cb(struct osmo_fd *ofd, unsigned int what) +{ + int rc; + struct sockaddr_storage sa; + socklen_t sa_len = sizeof(sa); + + rc = accept(ofd->fd, (struct sockaddr *)&sa, &sa_len); + if (rc < 0) { + LOGP(DSMPP, LOGL_ERROR, "Accept returns %d (%s)\n", + rc, strerror(errno)); + return rc; + } + return link_accept_cb(ofd->data, rc, &sa, sa_len); +} + +/*! \brief allocate and initialize an smsc struct from talloc context ctx. */ +struct smsc *smpp_smsc_alloc_init(void *ctx) +{ + struct smsc *smsc = talloc_zero(ctx, struct smsc); + + INIT_LLIST_HEAD(&smsc->esme_list); + INIT_LLIST_HEAD(&smsc->acl_list); + INIT_LLIST_HEAD(&smsc->route_list); + + smsc->listen_ofd.data = smsc; + smsc->listen_ofd.cb = smsc_fd_cb; + + return smsc; +} + +/*! \brief Set the SMPP address and port without binding. */ +int smpp_smsc_conf(struct smsc *smsc, const char *bind_addr, uint16_t port) +{ + talloc_free((void*)smsc->bind_addr); + smsc->bind_addr = NULL; + if (bind_addr) { + smsc->bind_addr = talloc_strdup(smsc, bind_addr); + if (!smsc->bind_addr) + return -ENOMEM; + } + smsc->listen_port = port; + return 0; +} + +/*! \brief Bind to given address and port and accept connections. + * \param[in] bind_addr Local IP address, may be NULL for any. + * \param[in] port TCP port number, may be 0 for default SMPP (2775). + */ +int smpp_smsc_start(struct smsc *smsc, const char *bind_addr, uint16_t port) +{ + int rc; + + /* default port for SMPP */ + if (!port) + port = 2775; + + smpp_smsc_stop(smsc); + + LOGP(DSMPP, LOGL_NOTICE, "SMPP at %s %d\n", + bind_addr? bind_addr : "0.0.0.0", port); + + rc = osmo_sock_init_ofd(&smsc->listen_ofd, AF_UNSPEC, SOCK_STREAM, + IPPROTO_TCP, bind_addr, port, + OSMO_SOCK_F_BIND); + if (rc < 0) + return rc; + + /* store new address and port */ + rc = smpp_smsc_conf(smsc, bind_addr, port); + if (rc) + smpp_smsc_stop(smsc); + return rc; +} + +/*! \brief Change a running connection to a different address/port, and upon + * error switch back to the running configuration. */ +int smpp_smsc_restart(struct smsc *smsc, const char *bind_addr, uint16_t port) +{ + int rc; + + rc = smpp_smsc_start(smsc, bind_addr, port); + if (rc) + /* if there is an error, try to re-bind to the old port */ + return smpp_smsc_start(smsc, smsc->bind_addr, smsc->listen_port); + return 0; +} + +/*! /brief Close SMPP connection. */ +void smpp_smsc_stop(struct smsc *smsc) +{ + if (smsc->listen_ofd.fd > 0) { + close(smsc->listen_ofd.fd); + smsc->listen_ofd.fd = 0; + osmo_fd_unregister(&smsc->listen_ofd); + } +} |