| /* SMPP 3.4 interface, SMSC-side implementation */ |
| /* (C) 2012 by Harald Welte <laforge@gnumonks.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <stdint.h> |
| #include <errno.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> |
| |
| enum emse_bind { |
| ESME_BIND_RX = 0x01, |
| ESME_BIND_TX = 0x02, |
| }; |
| |
| |
| |
| #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; \ |
| } |
| |
| #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, "Error during smpp34_pack(): %s\n", |
| smpp34_strerror); |
| msgb_free(msg); |
| return -EINVAL; |
| } |
| msgb_put(msg, rlen); |
| |
| return osmo_wqueue_enqueue(&esme->wqueue, msg); |
| } |
| |
| static int smpp_tx_gen_nack(struct osmo_esme *esme, uint32_t seq, uint32_t status) |
| { |
| struct generic_nack_t nack; |
| |
| nack.command_length = 0; |
| nack.command_id = GENERIC_NACK; |
| nack.sequence_number = seq; |
| nack.command_status = status; |
| |
| return PACK_AND_SEND(esme, &nack); |
| } |
| |
| static inline uint32_t smpp_msgb_cmdid(struct msgb *msg) |
| { |
| uint8_t *tmp = msgb_data(msg) + 4; |
| return ntohl(*(uint32_t *)tmp); |
| } |
| |
| static inline uint32_t smpp_msgb_seq(struct msgb *msg) |
| { |
| uint8_t *tmp = msgb_data(msg); |
| return ntohl(*(uint32_t *)tmp); |
| } |
| |
| |
| static int smpp_handle_gen_nack(struct osmo_esme *esme, struct msgb *msg) |
| { |
| struct generic_nack_t nack; |
| char buf[SMALL_BUFF]; |
| int rc; |
| |
| rc = smpp34_unpack(GENERIC_NACK, &nack, msgb_data(msg), |
| msgb_length(msg)); |
| if (rc < 0) |
| return rc; |
| |
| LOGP(DSMPP, LOGL_ERROR, "%s: GENERIC NACK: %s\n", esme->system_id, |
| str_command_status(nack.command_status, buf)); |
| |
| return 0; |
| } |
| |
| 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; |
| |
| rc = smpp34_unpack(BIND_RECEIVER, &bind, msgb_data(msg), |
| msgb_length(msg)); |
| if (rc < 0) |
| return rc; |
| |
| INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind); |
| |
| LOGP(DSMPP, LOGL_INFO, "%s: BIND Rx from (Version %02x)\n", |
| bind.system_id, bind.interface_version); |
| |
| if (bind.interface_version != SMPP_VERSION) { |
| bind_r.command_status = ESME_RSYSERR; |
| goto err; |
| } |
| |
| if (esme->bind_flags) { |
| bind_r.command_status = ESME_RALYBND; |
| goto err; |
| } |
| |
| esme->smpp_version = bind.interface_version; |
| snprintf(esme->system_id, sizeof(esme->system_id), "%s", |
| bind.system_id); |
| esme->bind_flags = ESME_BIND_RX; |
| |
| /* FIXME */ |
| err: |
| return 0; |
| } |
| |
| 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; |
| |
| rc = smpp34_unpack(BIND_TRANSMITTER, &bind, msgb_data(msg), |
| msgb_length(msg)); |
| if (rc < 0) { |
| printf("error during unpack: %s\n", smpp34_strerror); |
| return rc; |
| } |
| |
| INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind); |
| |
| LOGP(DSMPP, LOGL_INFO, "%s: BIND Tx (Version %02x)\n", |
| bind.system_id, bind.interface_version); |
| |
| if (bind.interface_version != SMPP_VERSION) { |
| bind_r.command_status = ESME_RSYSERR; |
| goto err; |
| } |
| |
| if (esme->bind_flags) { |
| bind_r.command_status = ESME_RALYBND; |
| goto err; |
| } |
| |
| esme->smpp_version = bind.interface_version; |
| snprintf(esme->system_id, sizeof(esme->system_id), "%s", bind.system_id); |
| esme->bind_flags = ESME_BIND_TX; |
| |
| /* 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); |
| |
| err: |
| return PACK_AND_SEND(esme, &bind_r); |
| } |
| |
| 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; |
| |
| rc = smpp34_unpack(BIND_TRANSCEIVER, &bind, msgb_data(msg), |
| msgb_length(msg)); |
| if (rc < 0) |
| return rc; |
| |
| INIT_RESP(BIND_TRANSMITTER_RESP, &bind_r, &bind); |
| |
| LOGP(DSMPP, LOGL_INFO, "%s: BIND Trx (Version %02x)\n", |
| bind.system_id, bind.interface_version); |
| |
| if (bind.interface_version != SMPP_VERSION) { |
| bind_r.command_status = ESME_RSYSERR; |
| goto err; |
| } |
| |
| if (esme->bind_flags) { |
| bind_r.command_status = ESME_RALYBND; |
| goto err; |
| } |
| |
| esme->smpp_version = bind.interface_version; |
| snprintf(esme->system_id, sizeof(esme->system_id), "%s", bind.system_id); |
| esme->bind_flags |= ESME_BIND_TX | ESME_BIND_RX; |
| |
| /* FIXME */ |
| err: |
| return 0; |
| } |
| |
| static int smpp_handle_unbind(struct osmo_esme *esme, struct msgb *msg) |
| { |
| struct unbind_t unbind; |
| struct unbind_resp_t unbind_r; |
| int rc; |
| |
| rc = smpp34_unpack(UNBIND, &unbind, msgb_data(msg), |
| msgb_length(msg)); |
| if (rc < 0) |
| return rc; |
| |
| INIT_RESP(UNBIND_RESP, &unbind_r, &unbind); |
| |
| LOGP(DSMPP, LOGL_INFO, "%s: 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); |
| } |
| |
| |
| 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; |
| |
| rc = smpp34_unpack(ENQUIRE_LINK, &enq, msgb_data(msg), |
| msgb_length(msg)); |
| if (rc < 0) |
| return rc; |
| |
| LOGP(DSMPP, LOGL_DEBUG, "%s: Enquire Link\n", esme->system_id); |
| |
| INIT_RESP(ENQUIRE_LINK_RESP, &enq_r, &enq); |
| |
| return PACK_AND_SEND(esme, &enq_r); |
| } |
| |
| 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; |
| |
| rc = smpp34_unpack(SUBMIT_SM, &submit, msgb_data(msg), |
| msgb_length(msg)); |
| if (rc < 0) |
| 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: SUBMIT-SM(%s)\n", esme->system_id, |
| submit.service_type); |
| |
| 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; |
| } |
| |
| /* one complete SMPP PDU from the ESME has been received */ |
| static int smpp_pdu_rx(struct osmo_esme *esme, struct msgb *msg) |
| { |
| 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: |
| break; |
| case DATA_SM: |
| break; |
| case CANCEL_SM: |
| case QUERY_SM: |
| case REPLACE_SM: |
| case SUBMIT_MULTI: |
| LOGP(DSMPP, LOGL_NOTICE, "%s: Unimplemented PDU Commmand " |
| "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; |
| } |
| |
| static void esme_destroy(struct osmo_esme *esme) |
| { |
| osmo_wqueue_clear(&esme->wqueue); |
| osmo_fd_unregister(&esme->wqueue.bfd); |
| close(esme->wqueue.bfd.fd); |
| llist_del(&esme->list); |
| talloc_free(esme); |
| } |
| |
| /* 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; |
| int rdlen; |
| int 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, "read returned %d\n", rc); |
| } else if (rc == 0) { |
| goto dead_socket; |
| } else |
| esme->read_idx += rc; |
| if (esme->read_idx >= sizeof(uint32_t)) { |
| esme->read_len = ntohl(len); |
| 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, "read returned %d\n", rc); |
| } else if (rc == 0) { |
| goto dead_socket; |
| } else { |
| esme->read_idx += rc; |
| msgb_put(msg, rc); |
| } |
| |
| if (esme->read_idx >= esme->read_len) { |
| rc = smpp_pdu_rx(esme, 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); |
| esme_destroy(esme); |
| |
| return 0; |
| } |
| |
| /* call-back of write queue once it wishes to write a message to the socket */ |
| static void 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) { |
| esme_destroy(esme); |
| } else if (rc < msgb_length(msg)) { |
| LOGP(DSMPP, LOGL_ERROR, "%s: Short write\n", esme->system_id); |
| return; |
| } |
| } |
| |
| /* 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) |
| return -ENOMEM; |
| |
| 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; |
| osmo_fd_register(&esme->wqueue.bfd); |
| |
| 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); |
| } |
| |
| int smpp_smsc_init(struct smsc *smsc, uint16_t port) |
| { |
| int rc; |
| |
| INIT_LLIST_HEAD(&smsc->esme_list); |
| smsc->listen_ofd.data = smsc; |
| smsc->listen_ofd.cb = smsc_fd_cb; |
| rc = osmo_sock_init_ofd(&smsc->listen_ofd, AF_UNSPEC, SOCK_STREAM, |
| IPPROTO_TCP, NULL, port, OSMO_SOCK_F_BIND); |
| |
| return rc; |
| } |