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-rw-r--r--openbsc/src/nat/bsc_mgcp_utils.c559
1 files changed, 0 insertions, 559 deletions
diff --git a/openbsc/src/nat/bsc_mgcp_utils.c b/openbsc/src/nat/bsc_mgcp_utils.c
deleted file mode 100644
index 5d77c2bd9..000000000
--- a/openbsc/src/nat/bsc_mgcp_utils.c
+++ /dev/null
@@ -1,559 +0,0 @@
-/*
- * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
- * (C) 2010 by On-Waves
- * All Rights Reserved
- *
- * 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.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- */
-
-#include <openbsc/bsc_nat.h>
-#include <openbsc/gsm_data.h>
-#include <openbsc/bssap.h>
-#include <openbsc/debug.h>
-#include <openbsc/mgcp.h>
-#include <openbsc/mgcp_internal.h>
-
-#include <sccp/sccp.h>
-
-#include <osmocore/talloc.h>
-#include <osmocore/gsm0808.h>
-
-#include <netinet/in.h>
-#include <arpa/inet.h>
-
-#include <errno.h>
-#include <unistd.h>
-
-int bsc_mgcp_assign(struct sccp_connections *con, struct msgb *msg)
-{
- struct sccp_connections *mcon;
- struct tlv_parsed tp;
- u_int16_t cic;
- u_int8_t timeslot;
- u_int8_t multiplex;
- int combined;
-
- if (!msg->l3h) {
- LOGP(DNAT, LOGL_ERROR, "Assignment message should have l3h pointer.\n");
- return -1;
- }
-
- if (msgb_l3len(msg) < 3) {
- LOGP(DNAT, LOGL_ERROR, "Assignment message has not enough space for GSM0808.\n");
- return -1;
- }
-
- tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 3, msgb_l3len(msg) - 3, 0, 0);
- if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) {
- LOGP(DNAT, LOGL_ERROR, "Circuit identity code not found in assignment message.\n");
- return -1;
- }
-
- cic = ntohs(*(u_int16_t *)TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE));
- timeslot = cic & 0x1f;
- multiplex = (cic & ~0x1f) >> 5;
-
-
- combined = (32 * multiplex) + timeslot;
-
- /* find stale connections using that endpoint */
- llist_for_each_entry(mcon, &con->bsc->nat->sccp_connections, list_entry) {
- if (mcon->msc_timeslot == combined) {
- LOGP(DNAT, LOGL_ERROR,
- "Timeslot %d was assigned to 0x%x and now 0x%x\n",
- combined,
- sccp_src_ref_to_int(&mcon->patched_ref),
- sccp_src_ref_to_int(&con->patched_ref));
- bsc_mgcp_dlcx(mcon);
- }
- }
-
- con->msc_timeslot = combined;
- con->bsc_timeslot = con->msc_timeslot;
- return 0;
-}
-
-static void bsc_mgcp_free_endpoint(struct bsc_nat *nat, int i)
-{
- if (nat->bsc_endpoints[i].transaction_id) {
- talloc_free(nat->bsc_endpoints[i].transaction_id);
- nat->bsc_endpoints[i].transaction_id = NULL;
- }
-
- nat->bsc_endpoints[i].bsc = NULL;
-}
-
-void bsc_mgcp_free_endpoints(struct bsc_nat *nat)
-{
- int i;
-
- for (i = 1; i < nat->mgcp_cfg->number_endpoints; ++i){
- bsc_mgcp_free_endpoint(nat, i);
- mgcp_free_endp(&nat->mgcp_cfg->endpoints[i]);
- }
-}
-
-/* send a MDCX where we do not want a response */
-static void bsc_mgcp_send_mdcx(struct bsc_connection *bsc, struct mgcp_endpoint *endp)
-{
- char buf[2096];
- int len;
-
- len = snprintf(buf, sizeof(buf),
- "MDCX 23 %x@mgw MGCP 1.0\r\n"
- "Z: noanswer\r\n"
- "\r\n"
- "c=IN IP4 %s\r\n"
- "m=audio %d RTP/AVP 255\r\n",
- ENDPOINT_NUMBER(endp),
- bsc->nat->mgcp_cfg->source_addr,
- endp->rtp_port);
- if (len < 0) {
- LOGP(DMGCP, LOGL_ERROR, "snprintf for DLCX failed.\n");
- return;
- }
-}
-
-static void bsc_mgcp_send_dlcx(struct bsc_connection *bsc, int endpoint)
-{
- char buf[2096];
- int len;
-
- len = snprintf(buf, sizeof(buf),
- "DLCX 23 %x@mgw MGCP 1.0\r\n"
- "Z: noanswer\r\n", endpoint);
- if (len < 0) {
- LOGP(DMGCP, LOGL_ERROR, "snprintf for DLCX failed.\n");
- return;
- }
-
- bsc_write_mgcp(bsc, (u_int8_t *) buf, len);
-}
-
-void bsc_mgcp_init(struct sccp_connections *con)
-{
- con->msc_timeslot = -1;
- con->bsc_timeslot = -1;
- con->crcx = 0;
-}
-
-void bsc_mgcp_dlcx(struct sccp_connections *con)
-{
- /* send a DLCX down the stream */
- if (con->bsc_timeslot != -1 && con->crcx) {
- int endp = mgcp_timeslot_to_endpoint(0, con->msc_timeslot);
- bsc_mgcp_send_dlcx(con->bsc, endp);
- bsc_mgcp_free_endpoint(con->bsc->nat, endp);
- }
-
- bsc_mgcp_init(con);
-}
-
-
-struct sccp_connections *bsc_mgcp_find_con(struct bsc_nat *nat, int endpoint)
-{
- struct sccp_connections *con = NULL;
- struct sccp_connections *sccp;
-
- llist_for_each_entry(sccp, &nat->sccp_connections, list_entry) {
- if (sccp->msc_timeslot == -1)
- continue;
- if (mgcp_timeslot_to_endpoint(0, sccp->msc_timeslot) != endpoint)
- continue;
-
- con = sccp;
- }
-
- if (con)
- return con;
-
- LOGP(DMGCP, LOGL_ERROR, "Failed to find the connection.\n");
- return NULL;
-}
-
-int bsc_mgcp_policy_cb(struct mgcp_config *cfg, int endpoint, int state, const char *transaction_id)
-{
- struct bsc_nat *nat;
- struct bsc_endpoint *bsc_endp;
- struct sccp_connections *sccp;
- struct mgcp_endpoint *mgcp_endp;
- struct msgb *bsc_msg;
-
- nat = cfg->data;
- bsc_endp = &nat->bsc_endpoints[endpoint];
- mgcp_endp = &nat->mgcp_cfg->endpoints[endpoint];
-
- if (bsc_endp->transaction_id) {
- LOGP(DMGCP, LOGL_ERROR, "Endpoint 0x%x had pending transaction: '%s'\n",
- endpoint, bsc_endp->transaction_id);
- talloc_free(bsc_endp->transaction_id);
- bsc_endp->transaction_id = NULL;
- }
- bsc_endp->bsc = NULL;
-
- sccp = bsc_mgcp_find_con(nat, endpoint);
-
- if (!sccp) {
- LOGP(DMGCP, LOGL_ERROR, "Did not find BSC for change on endpoint: 0x%x state: %d\n", endpoint, state);
-
- switch (state) {
- case MGCP_ENDP_CRCX:
- return MGCP_POLICY_REJECT;
- break;
- case MGCP_ENDP_DLCX:
- return MGCP_POLICY_CONT;
- break;
- case MGCP_ENDP_MDCX:
- return MGCP_POLICY_CONT;
- break;
- default:
- LOGP(DMGCP, LOGL_FATAL, "Unhandled state: %d\n", state);
- return MGCP_POLICY_CONT;
- break;
- }
- }
-
- /* we need to generate a new and patched message */
- bsc_msg = bsc_mgcp_rewrite((char *) nat->mgcp_msg, nat->mgcp_length,
- nat->mgcp_cfg->source_addr, mgcp_endp->rtp_port);
- if (!bsc_msg) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to patch the msg.\n");
- return MGCP_POLICY_CONT;
- }
-
-
- bsc_endp->transaction_id = talloc_strdup(nat, transaction_id);
- bsc_endp->bsc = sccp->bsc;
-
- /* we need to update some bits */
- if (state == MGCP_ENDP_CRCX) {
- struct sockaddr_in sock;
- socklen_t len = sizeof(sock);
- if (getpeername(sccp->bsc->write_queue.bfd.fd, (struct sockaddr *) &sock, &len) != 0) {
- LOGP(DMGCP, LOGL_ERROR, "Can not get the peername...%d/%s\n",
- errno, strerror(errno));
- } else {
- mgcp_endp->bts = sock.sin_addr;
- }
-
- /* send the message and a fake MDCX for force sending of a dummy packet */
- sccp->crcx = 1;
- bsc_write(sccp->bsc, bsc_msg, NAT_IPAC_PROTO_MGCP);
- bsc_mgcp_send_mdcx(sccp->bsc, mgcp_endp);
- return MGCP_POLICY_DEFER;
- } else if (state == MGCP_ENDP_DLCX) {
- /* we will free the endpoint now and send a DLCX to the BSC */
- msgb_free(bsc_msg);
- bsc_mgcp_dlcx(sccp);
- return MGCP_POLICY_CONT;
- } else {
- bsc_write(sccp->bsc, bsc_msg, NAT_IPAC_PROTO_MGCP);
- return MGCP_POLICY_DEFER;
- }
-}
-
-/*
- * We have received a msg from the BSC. We will see if we know
- * this transaction and if it belongs to the BSC. Then we will
- * need to patch the content to point to the local network and we
- * need to update the I: that was assigned by the BSS.
- */
-void bsc_mgcp_forward(struct bsc_connection *bsc, struct msgb *msg)
-{
- struct msgb *output;
- struct bsc_endpoint *bsc_endp = NULL;
- struct mgcp_endpoint *endp = NULL;
- int i, code;
- char transaction_id[60];
-
- /* Some assumption that our buffer is big enough.. and null terminate */
- if (msgb_l2len(msg) > 2000) {
- LOGP(DMGCP, LOGL_ERROR, "MGCP message too long.\n");
- return;
- }
-
- msg->l2h[msgb_l2len(msg)] = '\0';
-
- if (bsc_mgcp_parse_response((const char *) msg->l2h, &code, transaction_id) != 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to parse response code.\n");
- return;
- }
-
- for (i = 1; i < bsc->nat->mgcp_cfg->number_endpoints; ++i) {
- if (bsc->nat->bsc_endpoints[i].bsc != bsc)
- continue;
- /* no one listening? a bug? */
- if (!bsc->nat->bsc_endpoints[i].transaction_id)
- continue;
- if (strcmp(transaction_id, bsc->nat->bsc_endpoints[i].transaction_id) != 0)
- continue;
-
- endp = &bsc->nat->mgcp_cfg->endpoints[i];
- bsc_endp = &bsc->nat->bsc_endpoints[i];
- break;
- }
-
- if (!bsc_endp) {
- LOGP(DMGCP, LOGL_ERROR, "Could not find active endpoint: %s for msg: '%s'\n",
- transaction_id, (const char *) msg->l2h);
- return;
- }
-
- endp->ci = bsc_mgcp_extract_ci((const char *) msg->l2h);
-
- /* free some stuff */
- talloc_free(bsc_endp->transaction_id);
- bsc_endp->transaction_id = NULL;
-
- /*
- * rewrite the information. In case the endpoint was deleted
- * there should be nothing for us to rewrite so putting endp->rtp_port
- * with the value of 0 should be no problem.
- */
- output = bsc_mgcp_rewrite((char * ) msg->l2h, msgb_l2len(msg),
- bsc->nat->mgcp_cfg->source_addr, endp->rtp_port);
-
- if (!output) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to rewrite MGCP msg.\n");
- return;
- }
-
- if (write_queue_enqueue(&bsc->nat->mgcp_queue, output) != 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to queue MGCP msg.\n");
- msgb_free(output);
- }
-}
-
-int bsc_mgcp_parse_response(const char *str, int *code, char transaction[60])
-{
- /* we want to parse two strings */
- return sscanf(str, "%3d %59s\n", code, transaction) != 2;
-}
-
-int bsc_mgcp_extract_ci(const char *str)
-{
- int ci;
- char *res = strstr(str, "I: ");
- if (!res)
- return CI_UNUSED;
-
- if (sscanf(res, "I: %d", &ci) != 1)
- return CI_UNUSED;
- return ci;
-}
-
-/* we need to replace some strings... */
-struct msgb *bsc_mgcp_rewrite(char *input, int length, const char *ip, int port)
-{
- static const char *ip_str = "c=IN IP4 ";
- static const char *aud_str = "m=audio ";
-
- char buf[128];
- char *running, *token;
- struct msgb *output;
-
- if (length > 4096 - 128) {
- LOGP(DMGCP, LOGL_ERROR, "Input is too long.\n");
- return NULL;
- }
-
- output = msgb_alloc_headroom(4096, 128, "MGCP rewritten");
- if (!output) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to allocate new MGCP msg.\n");
- return NULL;
- }
-
- running = input;
- output->l2h = output->data;
- for (token = strsep(&running, "\n"); running; token = strsep(&running, "\n")) {
- int len = strlen(token);
- int cr = len > 0 && token[len - 1] == '\r';
-
- if (strncmp(ip_str, token, (sizeof ip_str) - 1) == 0) {
- output->l3h = msgb_put(output, strlen(ip_str));
- memcpy(output->l3h, ip_str, strlen(ip_str));
- output->l3h = msgb_put(output, strlen(ip));
- memcpy(output->l3h, ip, strlen(ip));
-
- if (cr) {
- output->l3h = msgb_put(output, 2);
- output->l3h[0] = '\r';
- output->l3h[1] = '\n';
- } else {
- output->l3h = msgb_put(output, 1);
- output->l3h[0] = '\n';
- }
- } else if (strncmp(aud_str, token, (sizeof aud_str) - 1) == 0) {
- int payload;
- if (sscanf(token, "m=audio %*d RTP/AVP %d", &payload) != 1) {
- LOGP(DMGCP, LOGL_ERROR, "Could not parsed audio line.\n");
- msgb_free(output);
- return NULL;
- }
-
- snprintf(buf, sizeof(buf)-1, "m=audio %d RTP/AVP %d%s",
- port, payload, cr ? "\r\n" : "\n");
- buf[sizeof(buf)-1] = '\0';
-
- output->l3h = msgb_put(output, strlen(buf));
- memcpy(output->l3h, buf, strlen(buf));
- } else {
- output->l3h = msgb_put(output, len + 1);
- memcpy(output->l3h, token, len);
- output->l3h[len] = '\n';
- }
- }
-
- return output;
-}
-
-static int mgcp_do_read(struct bsc_fd *fd)
-{
- struct bsc_nat *nat;
- struct msgb *msg, *resp;
- int rc;
-
- nat = fd->data;
-
- rc = read(fd->fd, nat->mgcp_msg, sizeof(nat->mgcp_msg) - 1);
- if (rc <= 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to read errno: %d\n", errno);
- return -1;
- }
-
- nat->mgcp_msg[rc] = '\0';
- nat->mgcp_length = rc;
-
- msg = msgb_alloc(sizeof(nat->mgcp_msg), "MGCP GW Read");
- if (!msg) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to create buffer.\n");
- return -1;
- }
-
- msg->l2h = msgb_put(msg, rc);
- memcpy(msg->l2h, nat->mgcp_msg, msgb_l2len(msg));
- resp = mgcp_handle_message(nat->mgcp_cfg, msg);
- msgb_free(msg);
-
- /* we do have a direct answer... e.g. AUEP */
- if (resp) {
- if (write_queue_enqueue(&nat->mgcp_queue, resp) != 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to enqueue msg.\n");
- msgb_free(resp);
- }
- }
-
- return 0;
-}
-
-static int mgcp_do_write(struct bsc_fd *bfd, struct msgb *msg)
-{
- int rc;
-
- rc = write(bfd->fd, msg->data, msg->len);
-
- if (rc != msg->len) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to write msg to MGCP CallAgent.\n");
- return -1;
- }
-
- return rc;
-}
-
-int bsc_mgcp_nat_init(struct bsc_nat *nat)
-{
- int on;
- struct sockaddr_in addr;
-
- if (!nat->mgcp_cfg->call_agent_addr) {
- LOGP(DMGCP, LOGL_ERROR, "The BSC nat requires the call agent ip to be set.\n");
- return -1;
- }
-
- if (nat->mgcp_cfg->bts_ip) {
- LOGP(DMGCP, LOGL_ERROR, "Do not set the BTS ip for the nat.\n");
- return -1;
- }
-
- nat->mgcp_queue.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
- if (nat->mgcp_queue.bfd.fd < 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to create MGCP socket. errno: %d\n", errno);
- return -1;
- }
-
- on = 1;
- setsockopt(nat->mgcp_queue.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
-
- addr.sin_family = AF_INET;
- addr.sin_port = htons(nat->mgcp_cfg->source_port);
- inet_aton(nat->mgcp_cfg->source_addr, &addr.sin_addr);
-
- if (bind(nat->mgcp_queue.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to bind. errno: %d\n", errno);
- close(nat->mgcp_queue.bfd.fd);
- nat->mgcp_queue.bfd.fd = -1;
- return -1;
- }
-
- addr.sin_port = htons(2727);
- inet_aton(nat->mgcp_cfg->call_agent_addr, &addr.sin_addr);
- if (connect(nat->mgcp_queue.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to connect to: '%s'. errno: %d\n",
- nat->mgcp_cfg->call_agent_addr, errno);
- close(nat->mgcp_queue.bfd.fd);
- nat->mgcp_queue.bfd.fd = -1;
- return -1;
- }
-
- write_queue_init(&nat->mgcp_queue, 10);
- nat->mgcp_queue.bfd.when = BSC_FD_READ;
- nat->mgcp_queue.bfd.data = nat;
- nat->mgcp_queue.read_cb = mgcp_do_read;
- nat->mgcp_queue.write_cb = mgcp_do_write;
-
- if (bsc_register_fd(&nat->mgcp_queue.bfd) != 0) {
- LOGP(DMGCP, LOGL_ERROR, "Failed to register MGCP fd.\n");
- close(nat->mgcp_queue.bfd.fd);
- nat->mgcp_queue.bfd.fd = -1;
- return -1;
- }
-
- /* some more MGCP config handling */
- nat->mgcp_cfg->audio_payload = -1;
- nat->mgcp_cfg->data = nat;
- nat->mgcp_cfg->policy_cb = bsc_mgcp_policy_cb;
- nat->mgcp_cfg->force_realloc = 1;
- nat->mgcp_cfg->bts_ip = "";
- nat->bsc_endpoints = talloc_zero_array(nat,
- struct bsc_endpoint,
- nat->mgcp_cfg->number_endpoints + 1);
-
- return 0;
-}
-
-void bsc_mgcp_clear_endpoints_for(struct bsc_connection *bsc)
-{
- int i;
- for (i = 1; i < bsc->nat->mgcp_cfg->number_endpoints; ++i) {
- struct bsc_endpoint *bsc_endp = &bsc->nat->bsc_endpoints[i];
-
- if (bsc_endp->bsc != bsc)
- continue;
-
- bsc_mgcp_free_endpoint(bsc->nat, i);
- mgcp_free_endp(&bsc->nat->mgcp_cfg->endpoints[i]);
- }
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-26 16:21:19 +0000