/* Point-to-Point (PP) Short Message Service (SMS) * Support on Mobile Radio Interface * 3GPP TS 04.11 version 7.1.0 Release 1998 / ETSI TS 100 942 V7.1.0 */ /* (C) 2008 by Daniel Willmann * (C) 2009 by Harald Welte * (C) 2010-2012 by Holger Hans Peter Freyther * (C) 2010 by On-Waves * (C) 2011 by Andreas Eversberg * * 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 . * */ #include #include #include #include #include #include #include "config.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef BUILD_SMPP #include #endif void *tall_gsms_ctx; static uint32_t new_callref = 0x40000001; struct gsm_sms *sms_alloc(void) { return talloc_zero(tall_gsms_ctx, struct gsm_sms); } void sms_free(struct gsm_sms *sms) { /* drop references to subscriber structure */ if (sms->receiver) vlr_subscr_put(sms->receiver, VSUB_USE_SMS_RECEIVER); #ifdef BUILD_SMPP if (sms->smpp.esme) smpp_esme_put(sms->smpp.esme); #endif talloc_free(sms); } struct gsm_sms *sms_from_text(struct vlr_subscr *receiver, const char *sender_msisdn, int dcs, const char *text) { struct gsm_sms *sms = sms_alloc(); if (!sms) return NULL; vlr_subscr_get(receiver, VSUB_USE_SMS_RECEIVER); sms->receiver = receiver; OSMO_STRLCPY_ARRAY(sms->text, text); OSMO_STRLCPY_ARRAY(sms->src.addr, sender_msisdn); sms->reply_path_req = 0; sms->status_rep_req = 0; sms->ud_hdr_ind = 0; sms->protocol_id = 0; /* implicit */ sms->data_coding_scheme = dcs; OSMO_STRLCPY_ARRAY(sms->dst.addr, receiver->msisdn); /* Generate user_data */ sms->user_data_len = gsm_7bit_encode_n(sms->user_data, sizeof(sms->user_data), sms->text, NULL); return sms; } static void send_signal(int sig_no, struct gsm_trans *trans, struct gsm_sms *sms, int paging_result) { struct sms_signal_data sig; sig.trans = trans; sig.sms = sms; sig.paging_result = paging_result; osmo_signal_dispatch(SS_SMS, sig_no, &sig); } static int gsm411_sendmsg(struct gsm_trans *trans, struct msgb *msg) { LOG_TRANS(trans, LOGL_DEBUG, "GSM4.11 TX %s\n", msgb_hexdump(msg)); msg->l3h = msg->data; return msc_a_tx_dtap_to_i(trans->msc_a, msg); } /* Handle MMTS (More Messages to Send) indication */ static void gsm411_handle_mmts_ind(const struct gsm_trans *trans) { int32_t use_count; OSMO_ASSERT(trans); OSMO_ASSERT(trans->msc_a); use_count = osmo_use_count_by(&trans->msc_a->use_count, MSC_A_USE_SMS_MMTS); OSMO_ASSERT(use_count >= 0); /* Shall not be negative */ if (trans->sms.sm_rp_mmts_ind && use_count == 0) { LOG_TRANS(trans, LOGL_INFO, "Multi-part SMS delivery is initiated\n"); msc_a_get(trans->msc_a, MSC_A_USE_SMS_MMTS); } else if (trans->sms.sm_rp_mmts_ind && use_count > 0) { LOG_TRANS(trans, LOGL_INFO, "Continuing multi-part SMS delivery\n"); } else if (!trans->sms.sm_rp_mmts_ind && use_count > 0) { LOG_TRANS(trans, LOGL_INFO, "Multi-part SMS delivery has been completed\n"); msc_a_put(trans->msc_a, MSC_A_USE_SMS_MMTS); } } /* Paging callback for MT SMS (Paging is triggered by SMC) */ static void mmsms_paging_cb(struct msc_a *msc_a, struct gsm_trans *trans) { struct gsm_sms *sms = trans->sms.sms; LOG_TRANS(trans, LOGL_DEBUG, "%s(%s)\n", __func__, msc_a ? "success" : "expired"); if (msc_a) { /* Paging succeeded */ /* Associate transaction with established connection */ msc_a_get(msc_a, MSC_A_USE_SMS); trans->msc_a = msc_a; /* Multi-part SMS: handle MMTS (More Messages to Send) indication */ gsm411_handle_mmts_ind(trans); /* Confirm successful connection establishment */ gsm411_smc_recv(&trans->sms.smc_inst, GSM411_MMSMS_EST_CNF, NULL, 0); } else { /* Paging expired or failed */ /* Inform SMC about channel establishment failure */ gsm411_smc_recv(&trans->sms.smc_inst, GSM411_MMSMS_REL_IND, NULL, 0); /* gsm411_send_rp_data() doesn't set trans->sms.sms */ if (sms != NULL) { /* Notify the SMSqueue and free stored SMS */ send_signal(S_SMS_UNKNOWN_ERROR, NULL, sms, 0); trans->sms.sms = NULL; sms_free(sms); } /* Destroy this transaction */ trans_free(trans); } } static int gsm411_mmsms_est_req(struct gsm_trans *trans) { /* Subscriber's data shall be associated */ OSMO_ASSERT(trans->vsub != NULL); /* Check if connection is already established */ if (trans->msc_a != NULL) { LOG_TRANS(trans, LOGL_DEBUG, "Using an existing connection\n"); return gsm411_smc_recv(&trans->sms.smc_inst, GSM411_MMSMS_EST_CNF, NULL, 0); } /* Initiate Paging procedure */ LOG_TRANS(trans, LOGL_DEBUG, "Initiating Paging due to MMSMS_EST_REQ\n"); trans->paging_request = paging_request_start(trans->vsub, PAGING_CAUSE_SIGNALLING_LOW_PRIO, mmsms_paging_cb, trans, "MT-SMS"); if (!trans->paging_request) { LOG_TRANS(trans, LOGL_ERROR, "Failed to initiate Paging\n"); /* Inform SMC about channel establishment failure */ gsm411_smc_recv(&trans->sms.smc_inst, GSM411_MMSMS_REL_IND, NULL, 0); trans_free(trans); return -EIO; } return 0; } /* Prefix msg with a 04.08/04.11 CP header */ static int gsm411_cp_sendmsg(struct msgb *msg, struct gsm_trans *trans, uint8_t msg_type) { struct gsm48_hdr *gh; gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh)); /* Outgoing needs the highest bit set */ gh->proto_discr = GSM48_PDISC_SMS | (trans->transaction_id<<4); gh->msg_type = msg_type; OMSC_LINKID_CB(msg) = trans->dlci; LOG_TRANS(trans, LOGL_DEBUG, "sending CP message (trans=%x)\n", trans->transaction_id); return gsm411_sendmsg(trans, msg); } /* mm_send: receive MMCCSMS sap message from SMC */ static int gsm411_mm_send(struct gsm411_smc_inst *inst, int msg_type, struct msgb *msg, int cp_msg_type) { struct gsm_trans *trans = container_of(inst, struct gsm_trans, sms.smc_inst); int rc = 0; switch (msg_type) { case GSM411_MMSMS_EST_REQ: rc = gsm411_mmsms_est_req(trans); break; case GSM411_MMSMS_DATA_REQ: rc = gsm411_cp_sendmsg(msg, trans, cp_msg_type); return rc; /* gsm411_cp_sendmsg() takes msg ownership */ case GSM411_MMSMS_REL_REQ: LOG_TRANS(trans, LOGL_DEBUG, "Got MMSMS_REL_REQ, destroying transaction.\n"); trans_free(trans); break; default: LOG_TRANS(trans, LOGL_NOTICE, "Unhandled MMCCSMS msg 0x%x\n", msg_type); rc = -EINVAL; } msgb_free(msg); return rc; } /* mm_send: receive MNCCSMS sap message from SMR */ int gsm411_mn_send(struct gsm411_smr_inst *inst, int msg_type, struct msgb *msg) { struct gsm_trans *trans = container_of(inst, struct gsm_trans, sms.smr_inst); /* forward to SMC */ return gsm411_smc_send(&trans->sms.smc_inst, msg_type, msg); } static int gsm340_rx_sms_submit(struct gsm_trans *trans, struct gsm_sms *gsms) { if (db_sms_store(gsms) != 0) { LOG_TRANS(trans, LOGL_ERROR, "Failed to store SMS in Database\n"); return GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER; } /* dispatch a signal to tell higher level about it */ send_signal(S_SMS_SUBMITTED, NULL, gsms, 0); return 0; } /* generate a TPDU address field compliant with 03.40 sec. 9.1.2.5 */ static int gsm340_gen_oa_sub(uint8_t *oa, unsigned int oa_len, const struct gsm_sms_addr *src) { /* network specific, private numbering plan */ return gsm340_gen_oa(oa, oa_len, src->ton, src->npi, src->addr); } /* generate a msgb containing an 03.40 9.2.2.1 SMS-DELIVER TPDU derived from * struct gsm_sms, returns total size of TPDU */ static int gsm340_gen_sms_deliver_tpdu(struct gsm_trans *trans, struct msgb *msg, struct gsm_sms *sms) { uint8_t *smsp; uint8_t oa[12]; /* max len per 03.40 */ uint8_t octet_len; unsigned int old_msg_len = msg->len; int oa_len; /* generate first octet with masked bits */ smsp = msgb_put(msg, 1); /* TP-MTI (message type indicator) */ *smsp = GSM340_SMS_DELIVER_SC2MS; /* TP-MMS (more messages to send) */ if (0 /* FIXME */) *smsp |= 0x04; /* TP-SRI(deliver)/SRR(submit) */ if (sms->status_rep_req) *smsp |= 0x20; /* TP-UDHI (indicating TP-UD contains a header) */ if (sms->ud_hdr_ind) *smsp |= 0x40; /* generate originator address */ oa_len = gsm340_gen_oa_sub(oa, sizeof(oa), &sms->src); if (oa_len < 0) return -ENOSPC; smsp = msgb_put(msg, oa_len); memcpy(smsp, oa, oa_len); /* generate TP-PID */ smsp = msgb_put(msg, 1); *smsp = sms->protocol_id; /* generate TP-DCS */ smsp = msgb_put(msg, 1); *smsp = sms->data_coding_scheme; /* generate TP-SCTS */ smsp = msgb_put(msg, 7); gsm340_gen_scts(smsp, time(NULL)); /* generate TP-UDL */ smsp = msgb_put(msg, 1); *smsp = sms->user_data_len; /* generate TP-UD */ switch (gsm338_get_sms_alphabet(sms->data_coding_scheme)) { case DCS_7BIT_DEFAULT: octet_len = sms->user_data_len*7/8; if (sms->user_data_len*7%8 != 0) octet_len++; /* Warning, user_data_len indicates the amount of septets * (characters), we need amount of octets occupied */ smsp = msgb_put(msg, octet_len); memcpy(smsp, sms->user_data, octet_len); break; case DCS_UCS2: case DCS_8BIT_DATA: smsp = msgb_put(msg, sms->user_data_len); memcpy(smsp, sms->user_data, sms->user_data_len); break; default: LOG_TRANS(trans, LOGL_NOTICE, "Unhandled Data Coding Scheme: 0x%02X\n", sms->data_coding_scheme); break; } return msg->len - old_msg_len; } /* As defined by GSM 03.40, Section 9.2.2.3. */ static int gsm340_gen_sms_status_report_tpdu(struct gsm_trans *trans, struct msgb *msg, struct gsm_sms *sms) { unsigned int old_msg_len = msg->len; uint8_t oa[12]; /* max len per 03.40 */ uint8_t *smsp; int oa_len; /* generate first octet with masked bits */ smsp = msgb_put(msg, 1); /* TP-MTI (message type indicator) */ *smsp = GSM340_SMS_STATUS_REP_SC2MS; /* TP-MMS (more messages to send) */ if (0 /* FIXME */) *smsp |= 0x04; /* TP-MR (message reference) */ smsp = msgb_put(msg, 1); *smsp = sms->msg_ref; /* generate recipient address */ oa_len = gsm340_gen_oa_sub(oa, sizeof(oa), &sms->src); if (oa_len < 0) return -ENOSPC; smsp = msgb_put(msg, oa_len); memcpy(smsp, oa, oa_len); /* generate TP-SCTS (Service centre timestamp) */ smsp = msgb_put(msg, 7); gsm340_gen_scts(smsp, sms->created); /* generate TP-DT (Discharge time, in TP-SCTS format). */ smsp = msgb_put(msg, 7); gsm340_gen_scts(smsp, sms->created); /* TP-ST (status) */ smsp = msgb_put(msg, 1); /* From GSM 03.40, Section 9.2.3.15, 0x00 means OK. */ *smsp = 0x00; LOG_TRANS(trans, LOGL_INFO, "sending status report for SMS reference %x\n", sms->msg_ref); return msg->len - old_msg_len; } static int sms_route_mt_sms(struct gsm_trans *trans, struct gsm_sms *gsms) { int rc; struct msc_a *msc_a = trans->msc_a; struct gsm_network *net = msc_a_net(msc_a); #ifdef BUILD_SMPP /* * Route through SMPP first before going to the local database. In case * of a unroutable message and no local subscriber, SMPP will be tried * twice. In case of an unknown subscriber continue with the normal * delivery of the SMS. */ if (smpp_route_smpp_first()) { rc = smpp_try_deliver(gsms, msc_a); if (rc == GSM411_RP_CAUSE_MO_NUM_UNASSIGNED) /* unknown subscriber, try local */ goto try_local; if (rc < 0) { LOG_TRANS(trans, LOGL_ERROR, "SMS delivery error: %d\n", rc); rc = GSM411_RP_CAUSE_MO_TEMP_FAIL; /* rc will be logged by gsm411_send_rp_error() */ rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_DELIVER_UNKNOWN_ERROR)); } return rc; } try_local: #endif /* determine gsms->receiver based on dialled number */ gsms->receiver = vlr_subscr_find_by_msisdn(net->vlr, gsms->dst.addr, VSUB_USE_SMS_RECEIVER); if (gsms->receiver) return 0; #ifdef BUILD_SMPP /* Avoid a second look-up */ if (smpp_route_smpp_first()) { rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_NO_RECEIVER)); return GSM411_RP_CAUSE_MO_NUM_UNASSIGNED; } rc = smpp_try_deliver(gsms, msc_a); if (rc == GSM411_RP_CAUSE_MO_NUM_UNASSIGNED) { rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_NO_RECEIVER)); } else if (rc < 0) { LOG_TRANS(trans, LOGL_ERROR, "SMS delivery error: %d\n", rc); rc = GSM411_RP_CAUSE_MO_TEMP_FAIL; /* rc will be logged by gsm411_send_rp_error() */ rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_DELIVER_UNKNOWN_ERROR)); } #else rc = GSM411_RP_CAUSE_MO_NUM_UNASSIGNED; rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_NO_RECEIVER)); #endif return rc; } /* process an incoming TPDU (called from RP-DATA) * return value > 0: RP CAUSE for ERROR; < 0: silent error; 0 = success */ static int gsm340_rx_tpdu(struct gsm_trans *trans, struct msgb *msg, uint32_t gsm411_msg_ref) { uint8_t *smsp = msgb_sms(msg); struct gsm_sms *gsms; unsigned int sms_alphabet; uint8_t sms_mti, sms_vpf; uint8_t *sms_vp; uint8_t da_len_bytes; uint8_t address_lv[12]; /* according to 03.40 / 9.1.2.5 */ int rc = 0; struct gsm_network *net; struct vlr_subscr *vsub; if (!trans->msc_a) { LOG_TRANS(trans, LOGL_ERROR, "Insufficient info to process TPDU: " "MSC-A role is NULL?!?\n"); return GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER; } net = msc_a_net(trans->msc_a); vsub = msc_a_vsub(trans->msc_a); if (!net || !vsub) { LOG_TRANS(trans, LOGL_ERROR, "Insufficient info to process TPDU: " "gsm_network and/or vlr_subscr is NULL?!?\n"); return GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER; } /* FIXME: should we do this on success, after all checks? */ rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_SUBMITTED)); gsms = sms_alloc(); if (!gsms) return GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER; /* invert those fields where 0 means active/present */ sms_mti = *smsp & 0x03; sms_vpf = (*smsp & 0x18) >> 3; gsms->status_rep_req = (*smsp & 0x20) >> 5; gsms->ud_hdr_ind = (*smsp & 0x40); /* * Not evaluating MMS (More Messages to Send) because the * lchan stays open anyway. * Not evaluating RP (Reply Path) because we're not aware of its * benefits. */ smsp++; gsms->msg_ref = *smsp++; gsms->gsm411.transaction_id = trans->transaction_id; gsms->gsm411.msg_ref = gsm411_msg_ref; /* length in bytes of the destination address */ da_len_bytes = 2 + *smsp/2 + *smsp%2; if (da_len_bytes > 12) { LOG_TRANS(trans, LOGL_ERROR, "Destination Address > 12 bytes ?!?\n"); rc = GSM411_RP_CAUSE_SEMANT_INC_MSG; goto out; } else if (da_len_bytes < 4) { LOG_TRANS(trans, LOGL_ERROR, "Destination Address < 4 bytes ?!?\n"); rc = GSM411_RP_CAUSE_SEMANT_INC_MSG; goto out; } memset(address_lv, 0, sizeof(address_lv)); memcpy(address_lv, smsp, da_len_bytes); /* mangle first byte to reflect length in bytes, not digits */ address_lv[0] = da_len_bytes - 1; gsms->dst.ton = (address_lv[1] >> 4) & 7; gsms->dst.npi = address_lv[1] & 0xF; /* convert to real number */ if (gsm48_decode_bcd_number2(gsms->dst.addr, sizeof(gsms->dst.addr), address_lv, da_len_bytes, 1)) { LOG_TRANS(trans, LOGL_ERROR, "Failed to decode destination Address\n"); rc = GSM411_RP_CAUSE_SEMANT_INC_MSG; goto out; } smsp += da_len_bytes; gsms->protocol_id = *smsp++; gsms->data_coding_scheme = *smsp++; sms_alphabet = gsm338_get_sms_alphabet(gsms->data_coding_scheme); if (sms_alphabet == 0xffffffff) { rc = GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER; goto out; } switch (sms_vpf) { case GSM340_TP_VPF_RELATIVE: sms_vp = smsp++; break; case GSM340_TP_VPF_ABSOLUTE: case GSM340_TP_VPF_ENHANCED: sms_vp = smsp; /* the additional functionality indicator... */ if (sms_vpf == GSM340_TP_VPF_ENHANCED && *smsp & (1<<7)) smsp++; smsp += 7; break; case GSM340_TP_VPF_NONE: sms_vp = 0; break; default: LOG_TRANS(trans, LOGL_NOTICE, "SMS Validity period not implemented: 0x%02x\n", sms_vpf); rc = GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER; goto out; } /* As per 3GPP TS 03.40, section 9.2.3.16, TP-User-Data-Length (TP-UDL) * may indicate either the number of septets, or the number of octets, * depending on Data Coding Scheme. We store TP-UDL value as-is, * so this should be kept in mind to avoid buffer overruns. */ gsms->user_data_len = *smsp++; if (gsms->user_data_len > 0) { if (sms_alphabet == DCS_7BIT_DEFAULT) { /* TP-UDL is indicated in septets (up to 160) */ if (gsms->user_data_len > GSM340_UDL_SPT_MAX) { LOG_TRANS(trans, LOGL_NOTICE, "TP-User-Data-Length %u (septets) " "is too big, truncating to %u\n", gsms->user_data_len, GSM340_UDL_SPT_MAX); gsms->user_data_len = GSM340_UDL_SPT_MAX; } memcpy(gsms->user_data, smsp, gsm_get_octet_len(gsms->user_data_len)); gsm_7bit_decode_n(gsms->text, sizeof(gsms->text), smsp, gsms->user_data_len); } else { /* TP-UDL is indicated in octets (up to 140) */ if (gsms->user_data_len > GSM340_UDL_OCT_MAX) { LOG_TRANS(trans, LOGL_NOTICE, "TP-User-Data-Length %u (octets) " "is too big, truncating to %u\n", gsms->user_data_len, GSM340_UDL_OCT_MAX); gsms->user_data_len = GSM340_UDL_OCT_MAX; } memcpy(gsms->user_data, smsp, gsms->user_data_len); } } OSMO_STRLCPY_ARRAY(gsms->src.addr, vsub->msisdn); LOG_TRANS(trans, LOGL_INFO, "MO SMS -- MTI: 0x%02x, VPF: 0x%02x, " "MR: 0x%02x PID: 0x%02x, DCS: 0x%02x, DA: %s, " "UserDataLength: 0x%02x, UserData: \"%s\"\n", sms_mti, sms_vpf, gsms->msg_ref, gsms->protocol_id, gsms->data_coding_scheme, gsms->dst.addr, gsms->user_data_len, sms_alphabet == DCS_7BIT_DEFAULT ? gsms->text : osmo_hexdump(gsms->user_data, gsms->user_data_len)); gsms->validity_minutes = gsm340_validity_period(sms_vpf, sms_vp); if (gsms->validity_minutes < net->sms_queue_cfg->minimum_validity_mins) { LOG_TRANS(trans, LOGL_INFO, "Overriding user-provided validity period (%lu) " "with minimum SMSC validity period (%u) minutes\n", gsms->validity_minutes, net->sms_queue_cfg->minimum_validity_mins); gsms->validity_minutes = net->sms_queue_cfg->minimum_validity_mins; } rc = sms_route_mt_sms(trans, gsms); /* This SMS got routed through SMPP and we are waiting on the response. */ if (gsms->smpp.esme) { rc = -EINPROGRESS; goto out; } /* This SMS got routed through SMPP, but the configured ESME was * unavailable at this time. This is an OOO condition. * Don't store this SMS in the database as we may never be * able to deliver it. (we would need to process the stored SMS and * attempt re-submission to the ESME) */ if (rc == GSM411_RP_CAUSE_MO_NET_OUT_OF_ORDER) goto out; /* free() the message */ /* * This SMS got routed through SMPP or no receiver exists. * In any case, we store it in the database for further processing. */ switch (sms_mti) { case GSM340_SMS_SUBMIT_MS2SC: /* MS is submitting a SMS */ rc = gsm340_rx_sms_submit(trans, gsms); break; case GSM340_SMS_COMMAND_MS2SC: case GSM340_SMS_DELIVER_REP_MS2SC: LOG_TRANS(trans, LOGL_NOTICE, "Unimplemented MTI 0x%02x\n", sms_mti); rc = GSM411_RP_CAUSE_IE_NOTEXIST; break; default: LOG_TRANS(trans, LOGL_NOTICE, "Undefined MTI 0x%02x\n", sms_mti); rc = GSM411_RP_CAUSE_IE_NOTEXIST; break; } out: sms_free(gsms); return rc; } /* Prefix msg with a RP-DATA header and send as SMR DATA */ static int gsm411_rp_sendmsg(struct gsm411_smr_inst *inst, struct msgb *msg, uint8_t rp_msg_type, uint8_t rp_msg_ref, int rl_msg_type) { struct gsm411_rp_hdr *rp; uint8_t len = msg->len; /* GSM 04.11 RP-DATA header */ rp = (struct gsm411_rp_hdr *)msgb_push(msg, sizeof(*rp)); rp->len = len + 2; rp->msg_type = rp_msg_type; rp->msg_ref = rp_msg_ref; return gsm411_smr_send(inst, rl_msg_type, msg); } int gsm411_send_rp_ack(struct gsm_trans *trans, uint8_t msg_ref) { struct msgb *msg = gsm411_msgb_alloc(); LOG_TRANS(trans, LOGL_DEBUG, "TX: SMS RP ACK\n"); return gsm411_rp_sendmsg(&trans->sms.smr_inst, msg, GSM411_MT_RP_ACK_MT, msg_ref, GSM411_SM_RL_REPORT_REQ); } int gsm411_send_rp_error(struct gsm_trans *trans, uint8_t msg_ref, uint8_t cause) { struct msgb *msg = gsm411_msgb_alloc(); msgb_tv_put(msg, 1, cause); LOG_TRANS(trans, LOGL_NOTICE, "TX: SMS RP ERROR, cause %d (%s)\n", cause, get_value_string(gsm411_rp_cause_strs, cause)); return gsm411_rp_sendmsg(&trans->sms.smr_inst, msg, GSM411_MT_RP_ERROR_MT, msg_ref, GSM411_SM_RL_REPORT_REQ); } /* Receive a 04.11 TPDU inside RP-DATA / user data */ static int gsm411_rx_rp_ud(struct msgb *msg, struct gsm_trans *trans, struct gsm411_rp_hdr *rph, uint8_t *dst, uint8_t dst_len) { int rc = 0; if (trans->net->sms_over_gsup) { /* RP-ACK or RP-ERROR is triggered as soon as we get the response */ rc = gsm411_gsup_mo_fwd_sm_req(trans, msg, rph->msg_ref, dst, dst_len); if (rc) /* GSUP message sending error */ return gsm411_send_rp_error(trans, rph->msg_ref, rc); return 0; } rc = gsm340_rx_tpdu(trans, msg, rph->msg_ref); if (rc == 0) return gsm411_send_rp_ack(trans, rph->msg_ref); else if (rc > 0) return gsm411_send_rp_error(trans, rph->msg_ref, rc); else if (rc == -EINPROGRESS) rc = 0; return rc; } /* Receive a 04.11 RP-DATA message in accordance with Section 7.3.1.2 */ static int gsm411_rx_rp_data(struct msgb *msg, struct gsm_trans *trans, struct gsm411_rp_hdr *rph) { uint8_t src_len, dst_len, rpud_len; uint8_t *src = NULL, *dst = NULL , *rp_ud = NULL; /* in the MO case, this should always be zero length */ src_len = rph->data[0]; if (src_len) src = &rph->data[1]; dst_len = rph->data[1+src_len]; if (dst_len) dst = &rph->data[1+src_len+1]; rpud_len = rph->data[1+src_len+1+dst_len]; if (rpud_len) rp_ud = &rph->data[1+src_len+1+dst_len+1]; LOG_TRANS(trans, LOGL_DEBUG, "RX_RP-DATA: src_len=%u, dst_len=%u ud_len=%u\n", src_len, dst_len, rpud_len); if (src_len && src) LOG_TRANS(trans, LOGL_ERROR, "RP-DATA (MO) with SRC ?!?\n"); if (!dst_len || !dst || !rpud_len || !rp_ud) { LOG_TRANS(trans, LOGL_ERROR, "RP-DATA (MO) without DST or TPDU ?!?\n"); gsm411_send_rp_error(trans, rph->msg_ref, GSM411_RP_CAUSE_INV_MAND_INF); return -EIO; } msg->l4h = rp_ud; LOG_TRANS(trans, LOGL_DEBUG, "DST(%u,%s)\n", dst_len, osmo_hexdump(dst, dst_len)); return gsm411_rx_rp_ud(msg, trans, rph, dst, dst_len); } static struct gsm_sms *sms_report_alloc(struct gsm_sms *sms, struct gsm_trans *trans) { struct gsm_sms *sms_report; int len; sms_report = sms_alloc(); OSMO_ASSERT(sms_report); sms_report->msg_ref = sms->msg_ref; sms_report->protocol_id = sms->protocol_id; sms_report->data_coding_scheme = GSM338_DCS_1111_8BIT_DATA; /* Invert address to send status report back to origin. */ sms_report->src = sms->dst; sms_report->dst = sms->src; /* As specified by Appendix B. Delivery Receipt Format. * TODO: Many fields in this string are just set with dummy values, * revisit this. */ len = snprintf((char *)sms_report->user_data, sizeof(sms_report->user_data), "id:%.08llu sub:000 dlvrd:000 submit date:YYMMDDhhmm done date:YYMMDDhhmm stat:DELIVRD err:000 text:%.20s", sms->id, sms->text); sms_report->user_data_len = len; LOG_TRANS(trans, LOGL_NOTICE, "%s\n", sms_report->user_data); /* This represents a sms report. */ sms_report->is_report = true; return sms_report; } static void sms_status_report(struct gsm_sms *gsms, struct gsm_trans *trans) { struct gsm_sms *sms_report; int rc; sms_report = sms_report_alloc(gsms, trans); rc = sms_route_mt_sms(trans, sms_report); if (rc < 0) { LOG_TRANS(trans, LOGL_ERROR, "Failed to send status report! err=%d\n", rc); return; } /* No route via SMPP, send the GSM 03.40 status-report now. */ if (sms_report->receiver) gsm340_rx_sms_submit(trans, sms_report); LOG_TRANS(trans, LOGL_NOTICE, "Status report has been sent\n"); sms_free(sms_report); } /* Receive a 04.11 RP-ACK message (response to RP-DATA from us) */ static int gsm411_rx_rp_ack(struct gsm_trans *trans, struct gsm411_rp_hdr *rph) { struct gsm_sms *sms = trans->sms.sms; /* Acnkowledgement to MT RP_DATA, i.e. the MS confirms it * successfully received a SMS. We can now safely mark it as * transmitted */ if (trans->net->sms_over_gsup) { /* Forward towards SMSC via GSUP */ return gsm411_gsup_mt_fwd_sm_res(trans, rph->msg_ref); } if (!sms) { LOG_TRANS(trans, LOGL_ERROR, "RX RP-ACK but no sms in transaction?!?\n"); return gsm411_send_rp_error(trans, rph->msg_ref, GSM411_RP_CAUSE_PROTOCOL_ERR); } /* mark this SMS as sent in database */ db_sms_mark_delivered(sms); send_signal(S_SMS_DELIVERED, trans, sms, 0); if (sms->status_rep_req) sms_status_report(sms, trans); sms_free(sms); trans->sms.sms = NULL; return 0; } static int gsm411_rx_rp_error(struct gsm_trans *trans, struct gsm411_rp_hdr *rph) { struct msc_a *msc_a = trans->msc_a; struct gsm_network *net = msc_a_net(msc_a); struct gsm_sms *sms = trans->sms.sms; uint8_t cause_len = rph->data[0]; uint8_t cause = rph->data[1]; /* Error in response to MT RP_DATA, i.e. the MS did not * successfully receive the SMS. We need to investigate * the cause and take action depending on it */ LOG_TRANS(trans, LOGL_NOTICE, "RX SMS RP-ERROR, cause %d:%d (%s)\n", cause_len, cause, get_value_string(gsm411_rp_cause_strs, cause)); if (trans->net->sms_over_gsup) { /* Forward towards SMSC via GSUP */ return gsm411_gsup_mt_fwd_sm_err(trans, rph->msg_ref, cause); } if (!sms) { LOG_TRANS(trans, LOGL_ERROR, "RX RP-ERR, but no sms in transaction?!?\n"); return -EINVAL; #if 0 return gsm411_send_rp_error(trans, rph->msg_ref, GSM411_RP_CAUSE_PROTOCOL_ERR); #endif } if (cause == GSM411_RP_CAUSE_MT_MEM_EXCEEDED) { /* MS has not enough memory to store the message. We need * to store this in our database and wait for a SMMA message */ /* FIXME */ send_signal(S_SMS_MEM_EXCEEDED, trans, sms, 0); rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_RP_ERR_MEM)); } else { send_signal(S_SMS_UNKNOWN_ERROR, trans, sms, 0); rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_RP_ERR_OTHER)); } sms_free(sms); trans->sms.sms = NULL; return 0; } static int gsm411_rx_rp_smma(struct msgb *msg, struct gsm_trans *trans, struct gsm411_rp_hdr *rph) { int rc; if (trans->net->sms_over_gsup) { /* RP-ACK or RP-ERROR is triggered as soon as we get the response */ rc = gsm411_gsup_mo_ready_for_sm_req(trans, rph->msg_ref); if (rc) /* GSUP message sending error */ return gsm411_send_rp_error(trans, rph->msg_ref, rc); return 0; } rc = gsm411_send_rp_ack(trans, rph->msg_ref); /* MS tells us that it has memory for more SMS, we need * to check if we have any pending messages for it and then * transfer those */ send_signal(S_SMS_SMMA, trans, NULL, 0); return rc; } /* receive RL DATA */ static int gsm411_rx_rl_data(struct msgb *msg, struct gsm48_hdr *gh, struct gsm_trans *trans) { struct gsm411_rp_hdr *rp_data = (struct gsm411_rp_hdr*)&gh->data; uint8_t msg_type = rp_data->msg_type & 0x07; int rc = 0; switch (msg_type) { case GSM411_MT_RP_DATA_MO: LOG_TRANS(trans, LOGL_DEBUG, "RX SMS RP-DATA (MO)\n"); rc = gsm411_rx_rp_data(msg, trans, rp_data); break; case GSM411_MT_RP_SMMA_MO: LOG_TRANS(trans, LOGL_DEBUG, "RX SMS RP-SMMA\n"); rc = gsm411_rx_rp_smma(msg, trans, rp_data); break; default: LOG_TRANS(trans, LOGL_NOTICE, "Invalid RP type 0x%02x\n", msg_type); rc = -EINVAL; break; } return rc; } /* receive RL REPORT */ static int gsm411_rx_rl_report(struct msgb *msg, struct gsm48_hdr *gh, struct gsm_trans *trans) { struct gsm411_rp_hdr *rp_data = (struct gsm411_rp_hdr*)&gh->data; uint8_t msg_type = rp_data->msg_type & 0x07; int rc = 0; switch (msg_type) { case GSM411_MT_RP_ACK_MO: LOG_TRANS(trans, LOGL_DEBUG, "RX SMS RP-ACK (MO)\n"); rc = gsm411_rx_rp_ack(trans, rp_data); break; case GSM411_MT_RP_ERROR_MO: LOG_TRANS(trans, LOGL_DEBUG, "RX SMS RP-ERROR (MO)\n"); rc = gsm411_rx_rp_error(trans, rp_data); break; default: LOG_TRANS(trans, LOGL_NOTICE, "Invalid RP type 0x%02x\n", msg_type); rc = -EINVAL; break; } return rc; } /* receive SM-RL sap message from SMR * NOTE: Message is freed by sender */ int gsm411_rl_recv(struct gsm411_smr_inst *inst, int msg_type, struct msgb *msg) { struct gsm_trans *trans = container_of(inst, struct gsm_trans, sms.smr_inst); struct gsm48_hdr *gh = msgb_l3(msg); int rc = 0; switch (msg_type) { case GSM411_SM_RL_DATA_IND: rc = gsm411_rx_rl_data(msg, gh, trans); break; case GSM411_SM_RL_REPORT_IND: if (gh) rc = gsm411_rx_rl_report(msg, gh, trans); break; default: LOG_TRANS(trans, LOGL_NOTICE, "Unhandled SM-RL message 0x%x\n", msg_type); rc = -EINVAL; } return rc; } /* receive MNCCSMS sap message from SMC * NOTE: Message is freed by sender */ static int gsm411_mn_recv(struct gsm411_smc_inst *inst, int msg_type, struct msgb *msg) { struct gsm_trans *trans = container_of(inst, struct gsm_trans, sms.smc_inst); struct gsm48_hdr *gh = msgb_l3(msg); int rc = 0; switch (msg_type) { case GSM411_MNSMS_EST_IND: case GSM411_MNSMS_DATA_IND: LOG_TRANS(trans, LOGL_DEBUG, "MNSMS-DATA/EST-IND\n"); rc = gsm411_smr_recv(&trans->sms.smr_inst, msg_type, msg); break; case GSM411_MNSMS_ERROR_IND: if (gh) LOG_TRANS(trans, LOGL_DEBUG, "MNSMS-ERROR-IND, cause %d (%s)\n", gh->data[0], get_value_string(gsm411_cp_cause_strs, gh->data[0])); else LOG_TRANS(trans, LOGL_DEBUG, "MNSMS-ERROR-IND, no cause\n"); rc = gsm411_smr_recv(&trans->sms.smr_inst, msg_type, msg); break; default: LOG_TRANS(trans, LOGL_NOTICE, "Unhandled MNCCSMS msg 0x%x\n", msg_type); rc = -EINVAL; } return rc; } static struct gsm_trans *gsm411_trans_init(struct gsm_network *net, struct vlr_subscr *vsub, struct msc_a *msc_a, uint8_t tid, bool mo) { /* Allocate a new transaction */ struct gsm_trans *trans = trans_alloc(net, vsub, TRANS_SMS, tid, new_callref++); if (!trans) { LOG_TRANS(trans, LOGL_ERROR, "No memory for transaction\n"); return NULL; } if (msc_a) { msc_a_get(msc_a, MSC_A_USE_SMS); trans->msc_a = msc_a; osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_TRANSACTION_ACCEPTED, trans); if (mo) { if (!osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_SMS)) LOG_TRANS(trans, LOGL_ERROR, "MO SMS without prior CM Service Request\n"); else msc_a_put(msc_a, MSC_A_USE_CM_SERVICE_SMS); } /* If we're re-using the existing LU connection, drop the LU token. * The idea behind this timer is explained in msc_a_put_use_lu(). */ if (osmo_timer_pending(&msc_a->lu_delay_timer)) { osmo_timer_del(&msc_a->lu_delay_timer); msc_a_put(msc_a, MSC_A_USE_LOCATION_UPDATING); } } /* Init both SMC and SMR state machines */ gsm411_smc_init(&trans->sms.smc_inst, 0, 1, gsm411_mn_recv, gsm411_mm_send); gsm411_smr_init(&trans->sms.smr_inst, 0, 1, gsm411_rl_recv, gsm411_mn_send); return trans; } /* Assigns an (unused) SM-RP-MR value to a given transaction */ static int gsm411_assign_sm_rp_mr(struct gsm_trans *trans) { uint8_t mr; /* After allocation a given transaction has zero-initialized * SM-RP-MR value, so trans_find_by_sm_rp_mr() may consider * 0x00 as used. This is why we "poison" this transaction * using the highest value. */ trans->sms.sm_rp_mr = 0xff; /* According to 8.2.3, MR is in the range 0 through 255 */ for (mr = 0x00; mr < 0xff; mr++) { if (trans_find_by_sm_rp_mr(trans->net, trans->vsub, mr)) continue; /* this MR is busy, find another one */ /* An unused value has been found, assign it */ trans->sms.sm_rp_mr = mr; return 0; } /* All possible values are busy */ return -EBUSY; } static struct gsm_trans *gsm411_alloc_mt_trans(struct gsm_network *net, struct vlr_subscr *vsub) { struct msc_a *msc_a; struct gsm_trans *trans; int tid; /* Generate a new transaction ID */ tid = trans_assign_trans_id(net, vsub, TRANS_SMS); if (tid == -1) { LOGP(DLSMS, LOGL_ERROR, "No available transaction IDs\n"); return NULL; } /* Attempt to find an existing connection */ msc_a = msc_a_for_vsub(vsub, true); /* Allocate a new transaction */ trans = gsm411_trans_init(net, vsub, msc_a, tid, false); if (!trans) return NULL; LOG_TRANS(trans, LOGL_INFO, "Going to send a MT SMS\n"); /* Assign a unique SM-RP Message Reference */ if (gsm411_assign_sm_rp_mr(trans) != 0) { LOG_TRANS(trans, LOGL_ERROR, "Failed to assign SM-RP-MR\n"); trans_free(trans); return NULL; } /* Use SAPI 3 (see GSM 04.11, section 2.3) */ trans->dlci = UM_SAPI_SMS; return trans; } /* High-level function to send an SMS to a given subscriber */ int gsm411_send_sms(struct gsm_network *net, struct vlr_subscr *vsub, struct gsm_sms *sms) { uint8_t *data, *rp_ud_len; struct gsm_trans *trans; struct msgb *msg; int rc; /* Allocate a new transaction for MT SMS */ trans = gsm411_alloc_mt_trans(net, vsub); if (!trans) { send_signal(S_SMS_UNKNOWN_ERROR, NULL, sms, 0); sms_free(sms); return -ENOMEM; } /* Allocate a message buffer for to be encoded SMS */ msg = gsm411_msgb_alloc(); if (!msg) { send_signal(S_SMS_UNKNOWN_ERROR, NULL, sms, 0); trans_free(trans); sms_free(sms); return -ENOMEM; } /* Hardcode SMSC Originating Address for now */ data = (uint8_t *)msgb_put(msg, 8); data[0] = 0x07; /* originator length == 7 */ data[1] = 0x91; /* type of number: international, ISDN */ data[2] = 0x44; /* 447785016005 */ data[3] = 0x77; data[4] = 0x58; data[5] = 0x10; data[6] = 0x06; data[7] = 0x50; /* Hardcoded Destination Address */ data = (uint8_t *)msgb_put(msg, 1); data[0] = 0; /* destination length == 0 */ /* obtain a pointer for the rp_ud_len, so we can fill it later */ rp_ud_len = (uint8_t *)msgb_put(msg, 1); if (sms->is_report) { /* generate the 03.40 SMS-STATUS-REPORT TPDU */ rc = gsm340_gen_sms_status_report_tpdu(trans, msg, sms); } else { /* generate the 03.40 SMS-DELIVER TPDU */ rc = gsm340_gen_sms_deliver_tpdu(trans, msg, sms); } if (rc < 0) { send_signal(S_SMS_UNKNOWN_ERROR, trans, sms, 0); sms_free(sms); trans_free(trans); msgb_free(msg); return rc; } *rp_ud_len = rc; /* Store a pointer to abstract SMS representation */ trans->sms.sms = sms; rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_DELIVERED)); db_sms_inc_deliver_attempts(trans->sms.sms); return gsm411_rp_sendmsg(&trans->sms.smr_inst, msg, GSM411_MT_RP_DATA_MT, trans->sms.sm_rp_mr, GSM411_SM_RL_DATA_REQ); } /* Low-level function to send raw RP-DATA to a given subscriber */ int gsm411_send_rp_data(struct gsm_network *net, struct vlr_subscr *vsub, size_t sm_rp_oa_len, const uint8_t *sm_rp_oa, size_t sm_rp_ud_len, const uint8_t *sm_rp_ud, bool sm_rp_mmts_ind, const uint8_t *gsup_source_name, size_t gsup_source_name_len) { struct gsm_trans *trans; struct msgb *msg; /* Allocate a new transaction for MT SMS */ trans = gsm411_alloc_mt_trans(net, vsub); if (!trans) return -ENOMEM; /* Multi-part SMS: handle MMTS (More Messages to Send) indication */ trans->sms.sm_rp_mmts_ind = sm_rp_mmts_ind; if (trans->msc_a != NULL) gsm411_handle_mmts_ind(trans); /* Save GSUP source_name for subsequent response messages */ if (gsup_source_name && gsup_source_name_len) { trans->sms.gsup_source_name = talloc_memdup(trans, gsup_source_name, gsup_source_name_len); if (!trans->sms.gsup_source_name) { trans_free(trans); return -ENOMEM; } trans->sms.gsup_source_name_len = gsup_source_name_len; } /* Allocate a message buffer for to be encoded SMS */ msg = gsm411_msgb_alloc(); if (!msg) { trans_free(trans); return -ENOMEM; } /* Encode SM-RP-OA (SMSC address) */ msgb_lv_put(msg, sm_rp_oa_len, sm_rp_oa); /* Encode SM-RP-DA (shall be empty, len=0) */ msgb_v_put(msg, 0x00); /* Encode RP-UD itself (SM TPDU) */ msgb_lv_put(msg, sm_rp_ud_len, sm_rp_ud); /* FIXME: MT SMS is not guaranteed to be delivered (e.g. the MS may be detached) */ rate_ctr_inc(rate_ctr_group_get_ctr(net->msc_ctrs, MSC_CTR_SMS_DELIVERED)); return gsm411_rp_sendmsg(&trans->sms.smr_inst, msg, GSM411_MT_RP_DATA_MT, trans->sms.sm_rp_mr, GSM411_SM_RL_DATA_REQ); } /* Entry point for incoming GSM48_PDISC_SMS from abis_rsl.c */ int gsm0411_rcv_sms(struct msc_a *msc_a, struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); uint8_t msg_type = gh->msg_type; uint8_t transaction_id = gsm48_hdr_trans_id_flip_ti(gh); struct gsm411_rp_hdr *rph = (struct gsm411_rp_hdr *) gh->data; struct gsm_trans *trans; int new_trans = 0; int rc = 0; struct vlr_subscr *vsub = msc_a_vsub(msc_a); struct gsm_network *net = msc_a_net(msc_a); trans = trans_find_by_id(msc_a, TRANS_SMS, transaction_id); /* * A transaction we created but don't know about? */ if (!trans && (transaction_id & 0x8) == 0) { LOG_TRANS(trans, LOGL_ERROR, "trans_id=%x allocated by us but known " "to us anymore. We are ignoring it, maybe a CP-ERROR " "from a MS?\n", transaction_id); return -EINVAL; } if (!trans) { new_trans = 1; trans = gsm411_trans_init(net, vsub, msc_a, transaction_id, true); if (!trans) { /* FIXME: send some error message */ return -ENOMEM; } trans->sms.sm_rp_mr = rph->msg_ref; /* SM-RP Message Reference */ trans->dlci = OMSC_LINKID_CB(msg); /* DLCI as received from BSC */ } LOG_TRANS(trans, LOGL_DEBUG, "receiving SMS message %s\n", gsm48_pdisc_msgtype_name(gsm48_hdr_pdisc(gh), gsm48_hdr_msg_type(gh))); /* According to section 5.3.4, due to structure of message flow on * SAPI 0 and 3 it is possible that the CP-ACK of a short message * transfer might not be received. In this case the reception of * CP-DATA may be interpreted as the reception of the awaited * CP-ACK (implicit) and CP-DATA message. */ if (trans->sms.smc_inst.cp_state == GSM411_CPS_IDLE && msg_type == GSM411_MT_CP_DATA) { int i; struct gsm_trans *ptrans; /* Scan through all remote initiated transactions */ for (i=8; i<15; i++) { if (i == transaction_id) continue; ptrans = trans_find_by_id(msc_a, TRANS_SMS, i); if (!ptrans) continue; LOG_TRANS(ptrans, LOGL_DEBUG, "Implicit CP-ACK for trans_id=%x\n", i); /* Finish it for good */ trans_free(ptrans); } } gsm411_smc_recv(&trans->sms.smc_inst, (new_trans) ? GSM411_MMSMS_EST_IND : GSM411_MMSMS_DATA_IND, msg, msg_type); return rc; } void _gsm411_sms_trans_free(struct gsm_trans *trans) { /* cleanup SMS instance */ gsm411_smr_clear(&trans->sms.smr_inst); trans->sms.smr_inst.rl_recv = NULL; trans->sms.smr_inst.mn_send = NULL; gsm411_smc_clear(&trans->sms.smc_inst); trans->sms.smc_inst.mn_recv = NULL; trans->sms.smc_inst.mm_send = NULL; if (trans->sms.sms) { LOG_TRANS(trans, LOGL_ERROR, "Freeing transaction that still contains an SMS -- discarding\n"); send_signal(S_SMS_UNKNOWN_ERROR, trans, trans->sms.sms, 0); sms_free(trans->sms.sms); trans->sms.sms = NULL; } } /* Process incoming SAPI N-REJECT from BSC */ void gsm411_sapi_n_reject(struct msc_a *msc_a) { struct gsm_network *net; struct gsm_trans *trans, *tmp; net = msc_a_net(msc_a); llist_for_each_entry_safe(trans, tmp, &net->trans_list, entry) { struct gsm_sms *sms; if (trans->msc_a != msc_a) continue; if (trans->type != TRANS_SMS) continue; sms = trans->sms.sms; if (!sms) { LOG_TRANS(trans, LOGL_ERROR, "SAPI Reject but no SMS.\n"); continue; } send_signal(S_SMS_UNKNOWN_ERROR, trans, sms, 0); sms_free(sms); trans->sms.sms = NULL; trans_free(trans); } }