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authorDavid M. Lee <dlee@digium.com>2013-01-07 14:24:28 -0600
committerDavid M. Lee <dlee@digium.com>2013-01-07 14:24:28 -0600
commitf3ab456a17af1c89a6e3be4d20c5944853df1cb0 (patch)
treed00e1a332cd038a6d906a1ea0ac91e1a4458e617 /pjsip-apps/src/samples/proxy.h
Import pjproject-2.0.1
Diffstat (limited to 'pjsip-apps/src/samples/proxy.h')
-rw-r--r--pjsip-apps/src/samples/proxy.h585
1 files changed, 585 insertions, 0 deletions
diff --git a/pjsip-apps/src/samples/proxy.h b/pjsip-apps/src/samples/proxy.h
new file mode 100644
index 0000000..2e1b383
--- /dev/null
+++ b/pjsip-apps/src/samples/proxy.h
@@ -0,0 +1,585 @@
+/* $Id: proxy.h 3553 2011-05-05 06:14:19Z nanang $ */
+/*
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.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 <pjsip.h>
+#include <pjlib-util.h>
+#include <pjlib.h>
+
+
+/* Options */
+static struct global_struct
+{
+ pj_caching_pool cp;
+ pjsip_endpoint *endpt;
+ int port;
+ pj_pool_t *pool;
+
+ pj_thread_t *thread;
+ pj_bool_t quit_flag;
+
+ pj_bool_t record_route;
+
+ unsigned name_cnt;
+ pjsip_host_port name[16];
+} global;
+
+
+
+static void app_perror(const char *msg, pj_status_t status)
+{
+ char errmsg[PJ_ERR_MSG_SIZE];
+
+ pj_strerror(status, errmsg, sizeof(errmsg));
+ PJ_LOG(1,(THIS_FILE, "%s: %s", msg, errmsg));
+}
+
+
+static void usage(void)
+{
+ puts("Options:\n"
+ "\n"
+ " -p, --port N Set local listener port to N\n"
+ " -R, --rr Perform record routing\n"
+ " -L, --log-level N Set log level to N (default: 4)\n"
+ " -h, --help Show this help screen\n"
+ );
+}
+
+
+static pj_status_t init_options(int argc, char *argv[])
+{
+ struct pj_getopt_option long_opt[] = {
+ { "port", 1, 0, 'p'},
+ { "rr", 0, 0, 'R'},
+ { "log-level", 1, 0, 'L'},
+ { "help", 0, 0, 'h'},
+ { NULL, 0, 0, 0}
+ };
+ int c;
+ int opt_ind;
+
+ pj_optind = 0;
+ while((c=pj_getopt_long(argc, argv, "p:L:Rh", long_opt, &opt_ind))!=-1) {
+ switch (c) {
+ case 'p':
+ global.port = atoi(pj_optarg);
+ printf("Port is set to %d\n", global.port);
+ break;
+
+ case 'R':
+ global.record_route = PJ_TRUE;
+ printf("Using record route mode\n");
+ break;
+
+ case 'L':
+ pj_log_set_level(atoi(pj_optarg));
+ break;
+
+ case 'h':
+ usage();
+ return -1;
+
+ default:
+ puts("Unknown option. Run with --help for help.");
+ return -1;
+ }
+ }
+
+ return PJ_SUCCESS;
+}
+
+
+/*****************************************************************************
+ * This is a very simple PJSIP module, whose sole purpose is to display
+ * incoming and outgoing messages to log. This module will have priority
+ * higher than transport layer, which means:
+ *
+ * - incoming messages will come to this module first before reaching
+ * transaction layer.
+ *
+ * - outgoing messages will come to this module last, after the message
+ * has been 'printed' to contiguous buffer by transport layer and
+ * appropriate transport instance has been decided for this message.
+ *
+ */
+
+/* Notification on incoming messages */
+static pj_bool_t logging_on_rx_msg(pjsip_rx_data *rdata)
+{
+ PJ_LOG(5,(THIS_FILE, "RX %d bytes %s from %s %s:%d:\n"
+ "%.*s\n"
+ "--end msg--",
+ rdata->msg_info.len,
+ pjsip_rx_data_get_info(rdata),
+ rdata->tp_info.transport->type_name,
+ rdata->pkt_info.src_name,
+ rdata->pkt_info.src_port,
+ (int)rdata->msg_info.len,
+ rdata->msg_info.msg_buf));
+
+ /* Always return false, otherwise messages will not get processed! */
+ return PJ_FALSE;
+}
+
+/* Notification on outgoing messages */
+static pj_status_t logging_on_tx_msg(pjsip_tx_data *tdata)
+{
+
+ /* Important note:
+ * tp_info field is only valid after outgoing messages has passed
+ * transport layer. So don't try to access tp_info when the module
+ * has lower priority than transport layer.
+ */
+
+ PJ_LOG(5,(THIS_FILE, "TX %d bytes %s to %s %s:%d:\n"
+ "%.*s\n"
+ "--end msg--",
+ (tdata->buf.cur - tdata->buf.start),
+ pjsip_tx_data_get_info(tdata),
+ tdata->tp_info.transport->type_name,
+ tdata->tp_info.dst_name,
+ tdata->tp_info.dst_port,
+ (int)(tdata->buf.cur - tdata->buf.start),
+ tdata->buf.start));
+
+ /* Always return success, otherwise message will not get sent! */
+ return PJ_SUCCESS;
+}
+
+/* The module instance. */
+static pjsip_module mod_msg_logger =
+{
+ NULL, NULL, /* prev, next. */
+ { "mod-msg-logger", 14 }, /* Name. */
+ -1, /* Id */
+ PJSIP_MOD_PRIORITY_TRANSPORT_LAYER-1,/* Priority */
+ NULL, /* load() */
+ NULL, /* start() */
+ NULL, /* stop() */
+ NULL, /* unload() */
+ &logging_on_rx_msg, /* on_rx_request() */
+ &logging_on_rx_msg, /* on_rx_response() */
+ &logging_on_tx_msg, /* on_tx_request. */
+ &logging_on_tx_msg, /* on_tx_response() */
+ NULL, /* on_tsx_state() */
+
+};
+
+
+static pj_status_t init_stack(void)
+{
+ pj_status_t status;
+
+ /* Must init PJLIB first: */
+ status = pj_init();
+ PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+
+
+ /* Then init PJLIB-UTIL: */
+ status = pjlib_util_init();
+ PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+
+
+ /* Must create a pool factory before we can allocate any memory. */
+ pj_caching_pool_init(&global.cp, &pj_pool_factory_default_policy, 0);
+
+ /* Create the endpoint: */
+ status = pjsip_endpt_create(&global.cp.factory, NULL, &global.endpt);
+ PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+
+ /* Init transaction layer for stateful proxy only */
+#if STATEFUL
+ status = pjsip_tsx_layer_init_module(global.endpt);
+ PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+#endif
+
+ /* Create listening transport */
+ {
+ pj_sockaddr_in addr;
+
+ addr.sin_family = pj_AF_INET();
+ addr.sin_addr.s_addr = 0;
+ addr.sin_port = pj_htons((pj_uint16_t)global.port);
+
+ status = pjsip_udp_transport_start( global.endpt, &addr,
+ NULL, 1, NULL);
+ if (status != PJ_SUCCESS)
+ return status;
+ }
+
+ /* Create pool for the application */
+ global.pool = pj_pool_create(&global.cp.factory, "proxyapp",
+ 4000, 4000, NULL);
+
+ /* Register the logger module */
+ pjsip_endpt_register_module(global.endpt, &mod_msg_logger);
+
+ return PJ_SUCCESS;
+}
+
+
+static pj_status_t init_proxy(void)
+{
+ pj_sockaddr pri_addr;
+ pj_sockaddr addr_list[16];
+ unsigned addr_cnt = PJ_ARRAY_SIZE(addr_list);
+ unsigned i;
+
+ /* List all names matching local endpoint.
+ * Note that PJLIB version 0.6 and newer has a function to
+ * enumerate local IP interface (pj_enum_ip_interface()), so
+ * by using it would be possible to list all IP interfaces in
+ * this host.
+ */
+
+ /* The first address is important since this would be the one
+ * to be added in Record-Route.
+ */
+ if (pj_gethostip(pj_AF_INET(), &pri_addr)==PJ_SUCCESS) {
+ pj_strdup2(global.pool, &global.name[global.name_cnt].host,
+ pj_inet_ntoa(pri_addr.ipv4.sin_addr));
+ global.name[global.name_cnt].port = global.port;
+ global.name_cnt++;
+ }
+
+ /* Get the rest of IP interfaces */
+ if (pj_enum_ip_interface(pj_AF_INET(), &addr_cnt, addr_list) == PJ_SUCCESS) {
+ for (i=0; i<addr_cnt; ++i) {
+
+ if (addr_list[i].ipv4.sin_addr.s_addr == pri_addr.ipv4.sin_addr.s_addr)
+ continue;
+
+ pj_strdup2(global.pool, &global.name[global.name_cnt].host,
+ pj_inet_ntoa(addr_list[i].ipv4.sin_addr));
+ global.name[global.name_cnt].port = global.port;
+ global.name_cnt++;
+ }
+ }
+
+ /* Add loopback address. */
+#if PJ_IP_HELPER_IGNORE_LOOPBACK_IF
+ global.name[global.name_cnt].host = pj_str("127.0.0.1");
+ global.name[global.name_cnt].port = global.port;
+ global.name_cnt++;
+#endif
+
+ global.name[global.name_cnt].host = *pj_gethostname();
+ global.name[global.name_cnt].port = global.port;
+ global.name_cnt++;
+
+ global.name[global.name_cnt].host = pj_str("localhost");
+ global.name[global.name_cnt].port = global.port;
+ global.name_cnt++;
+
+ PJ_LOG(3,(THIS_FILE, "Proxy started, listening on port %d", global.port));
+ PJ_LOG(3,(THIS_FILE, "Local host aliases:"));
+ for (i=0; i<global.name_cnt; ++i) {
+ PJ_LOG(3,(THIS_FILE, " %.*s:%d",
+ (int)global.name[i].host.slen,
+ global.name[i].host.ptr,
+ global.name[i].port));
+ }
+
+ if (global.record_route) {
+ PJ_LOG(3,(THIS_FILE, "Using Record-Route mode"));
+ }
+
+ return PJ_SUCCESS;
+}
+
+
+#if PJ_HAS_THREADS
+static int worker_thread(void *p)
+{
+ pj_time_val delay = {0, 10};
+
+ PJ_UNUSED_ARG(p);
+
+ while (!global.quit_flag) {
+ pjsip_endpt_handle_events(global.endpt, &delay);
+ }
+
+ return 0;
+}
+#endif
+
+
+/* Utility to determine if URI is local to this host. */
+static pj_bool_t is_uri_local(const pjsip_sip_uri *uri)
+{
+ unsigned i;
+ for (i=0; i<global.name_cnt; ++i) {
+ if ((uri->port == global.name[i].port ||
+ (uri->port==0 && global.name[i].port==5060)) &&
+ pj_stricmp(&uri->host, &global.name[i].host)==0)
+ {
+ /* Match */
+ return PJ_TRUE;
+ }
+ }
+
+ /* Doesn't match */
+ return PJ_FALSE;
+}
+
+
+/* Proxy utility to verify incoming requests.
+ * Return non-zero if verification failed.
+ */
+static pj_status_t proxy_verify_request(pjsip_rx_data *rdata)
+{
+ const pj_str_t STR_PROXY_REQUIRE = {"Proxy-Require", 13};
+
+ /* RFC 3261 Section 16.3 Request Validation */
+
+ /* Before an element can proxy a request, it MUST verify the message's
+ * validity. A valid message must pass the following checks:
+ *
+ * 1. Reasonable Syntax
+ * 2. URI scheme
+ * 3. Max-Forwards
+ * 4. (Optional) Loop Detection
+ * 5. Proxy-Require
+ * 6. Proxy-Authorization
+ */
+
+ /* 1. Reasonable Syntax.
+ * This would have been checked by transport layer.
+ */
+
+ /* 2. URI scheme.
+ * We only want to support "sip:" URI scheme for this simple proxy.
+ */
+ if (!PJSIP_URI_SCHEME_IS_SIP(rdata->msg_info.msg->line.req.uri)) {
+ pjsip_endpt_respond_stateless(global.endpt, rdata,
+ PJSIP_SC_UNSUPPORTED_URI_SCHEME, NULL,
+ NULL, NULL);
+ return PJSIP_ERRNO_FROM_SIP_STATUS(PJSIP_SC_UNSUPPORTED_URI_SCHEME);
+ }
+
+ /* 3. Max-Forwards.
+ * Send error if Max-Forwards is 1 or lower.
+ */
+ if (rdata->msg_info.max_fwd && rdata->msg_info.max_fwd->ivalue <= 1) {
+ pjsip_endpt_respond_stateless(global.endpt, rdata,
+ PJSIP_SC_TOO_MANY_HOPS, NULL,
+ NULL, NULL);
+ return PJSIP_ERRNO_FROM_SIP_STATUS(PJSIP_SC_TOO_MANY_HOPS);
+ }
+
+ /* 4. (Optional) Loop Detection.
+ * Nah, we don't do that with this simple proxy.
+ */
+
+ /* 5. Proxy-Require */
+ if (pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &STR_PROXY_REQUIRE,
+ NULL) != NULL)
+ {
+ pjsip_endpt_respond_stateless(global.endpt, rdata,
+ PJSIP_SC_BAD_EXTENSION, NULL,
+ NULL, NULL);
+ return PJSIP_ERRNO_FROM_SIP_STATUS(PJSIP_SC_BAD_EXTENSION);
+ }
+
+ /* 6. Proxy-Authorization.
+ * Nah, we don't require any authorization with this sample.
+ */
+
+ return PJ_SUCCESS;
+}
+
+
+/* Process route information in the reqeust */
+static pj_status_t proxy_process_routing(pjsip_tx_data *tdata)
+{
+ pjsip_sip_uri *target;
+ pjsip_route_hdr *hroute;
+
+ /* RFC 3261 Section 16.4 Route Information Preprocessing */
+
+ target = (pjsip_sip_uri*) tdata->msg->line.req.uri;
+
+ /* The proxy MUST inspect the Request-URI of the request. If the
+ * Request-URI of the request contains a value this proxy previously
+ * placed into a Record-Route header field (see Section 16.6 item 4),
+ * the proxy MUST replace the Request-URI in the request with the last
+ * value from the Route header field, and remove that value from the
+ * Route header field. The proxy MUST then proceed as if it received
+ * this modified request.
+ */
+ if (is_uri_local(target)) {
+ pjsip_route_hdr *r;
+ pjsip_sip_uri *uri;
+
+ /* Find the first Route header */
+ r = hroute = (pjsip_route_hdr*)
+ pjsip_msg_find_hdr(tdata->msg, PJSIP_H_ROUTE, NULL);
+ if (r == NULL) {
+ /* No Route header. This request is destined for this proxy. */
+ return PJ_SUCCESS;
+ }
+
+ /* Find the last Route header */
+ while ( (r=(pjsip_route_hdr*)pjsip_msg_find_hdr(tdata->msg,
+ PJSIP_H_ROUTE,
+ r->next)) != NULL )
+ {
+ hroute = r;
+ }
+
+ /* If the last Route header doesn't have ";lr" parameter, then
+ * this is a strict-routed request indeed, and we follow the steps
+ * in processing strict-route requests above.
+ *
+ * But if it does contain ";lr" parameter, skip the strict-route
+ * processing.
+ */
+ uri = (pjsip_sip_uri*)
+ pjsip_uri_get_uri(&hroute->name_addr);
+ if (uri->lr_param == 0) {
+ /* Yes this is strict route, so:
+ * - replace req URI with the URI in Route header,
+ * - remove the Route header,
+ * - proceed as if it received this modified request.
+ */
+ tdata->msg->line.req.uri = hroute->name_addr.uri;
+ target = (pjsip_sip_uri*) tdata->msg->line.req.uri;
+ pj_list_erase(hroute);
+ }
+ }
+
+ /* If the Request-URI contains a maddr parameter, the proxy MUST check
+ * to see if its value is in the set of addresses or domains the proxy
+ * is configured to be responsible for. If the Request-URI has a maddr
+ * parameter with a value the proxy is responsible for, and the request
+ * was received using the port and transport indicated (explicitly or by
+ * default) in the Request-URI, the proxy MUST strip the maddr and any
+ * non-default port or transport parameter and continue processing as if
+ * those values had not been present in the request.
+ */
+ if (target->maddr_param.slen != 0) {
+ pjsip_sip_uri maddr_uri;
+
+ maddr_uri.host = target->maddr_param;
+ maddr_uri.port = global.port;
+
+ if (is_uri_local(&maddr_uri)) {
+ target->maddr_param.slen = 0;
+ target->port = 0;
+ target->transport_param.slen = 0;
+ }
+ }
+
+ /* If the first value in the Route header field indicates this proxy,
+ * the proxy MUST remove that value from the request.
+ */
+ hroute = (pjsip_route_hdr*)
+ pjsip_msg_find_hdr(tdata->msg, PJSIP_H_ROUTE, NULL);
+ if (hroute && is_uri_local((pjsip_sip_uri*)hroute->name_addr.uri)) {
+ pj_list_erase(hroute);
+ }
+
+ return PJ_SUCCESS;
+}
+
+
+/* Postprocess the request before forwarding it */
+static void proxy_postprocess(pjsip_tx_data *tdata)
+{
+ /* Optionally record-route */
+ if (global.record_route) {
+ char uribuf[128];
+ pj_str_t uri;
+ const pj_str_t H_RR = { "Record-Route", 12 };
+ pjsip_generic_string_hdr *rr;
+
+ pj_ansi_snprintf(uribuf, sizeof(uribuf), "<sip:%.*s:%d;lr>",
+ (int)global.name[0].host.slen,
+ global.name[0].host.ptr,
+ global.name[0].port);
+ uri = pj_str(uribuf);
+ rr = pjsip_generic_string_hdr_create(tdata->pool,
+ &H_RR, &uri);
+ pjsip_msg_insert_first_hdr(tdata->msg, (pjsip_hdr*)rr);
+ }
+}
+
+
+/* Calculate new target for the request */
+static pj_status_t proxy_calculate_target(pjsip_rx_data *rdata,
+ pjsip_tx_data *tdata)
+{
+ pjsip_sip_uri *target;
+
+ /* RFC 3261 Section 16.5 Determining Request Targets */
+
+ target = (pjsip_sip_uri*) tdata->msg->line.req.uri;
+
+ /* If the Request-URI of the request contains an maddr parameter, the
+ * Request-URI MUST be placed into the target set as the only target
+ * URI, and the proxy MUST proceed to Section 16.6.
+ */
+ if (target->maddr_param.slen) {
+ proxy_postprocess(tdata);
+ return PJ_SUCCESS;
+ }
+
+
+ /* If the domain of the Request-URI indicates a domain this element is
+ * not responsible for, the Request-URI MUST be placed into the target
+ * set as the only target, and the element MUST proceed to the task of
+ * Request Forwarding (Section 16.6).
+ */
+ if (!is_uri_local(target)) {
+ proxy_postprocess(tdata);
+ return PJ_SUCCESS;
+ }
+
+ /* If the target set for the request has not been predetermined as
+ * described above, this implies that the element is responsible for the
+ * domain in the Request-URI, and the element MAY use whatever mechanism
+ * it desires to determine where to send the request.
+ */
+
+ /* We're not interested to receive request destined to us, so
+ * respond with 404/Not Found (only if request is not ACK!).
+ */
+ if (rdata->msg_info.msg->line.req.method.id != PJSIP_ACK_METHOD) {
+ pjsip_endpt_respond_stateless(global.endpt, rdata,
+ PJSIP_SC_NOT_FOUND, NULL,
+ NULL, NULL);
+ }
+
+ /* Delete the request since we're not forwarding it */
+ pjsip_tx_data_dec_ref(tdata);
+
+ return PJSIP_ERRNO_FROM_SIP_STATUS(PJSIP_SC_NOT_FOUND);
+}
+
+
+/* Destroy stack */
+static void destroy_stack(void)
+{
+ pjsip_endpt_destroy(global.endpt);
+ pj_pool_release(global.pool);
+ pj_caching_pool_destroy(&global.cp);
+
+ pj_shutdown();
+}
+