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Diffstat (limited to 'pjsip/src/pjsip/sip_resolve.c')
-rw-r--r--pjsip/src/pjsip/sip_resolve.c520
1 files changed, 520 insertions, 0 deletions
diff --git a/pjsip/src/pjsip/sip_resolve.c b/pjsip/src/pjsip/sip_resolve.c
new file mode 100644
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+++ b/pjsip/src/pjsip/sip_resolve.c
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+/* $Id: sip_resolve.c 4108 2012-04-27 01:32:12Z bennylp $ */
+/*
+ * 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/sip_resolve.h>
+#include <pjsip/sip_transport.h>
+#include <pjsip/sip_errno.h>
+#include <pjlib-util/errno.h>
+#include <pjlib-util/srv_resolver.h>
+#include <pj/addr_resolv.h>
+#include <pj/array.h>
+#include <pj/assert.h>
+#include <pj/ctype.h>
+#include <pj/log.h>
+#include <pj/pool.h>
+#include <pj/rand.h>
+#include <pj/string.h>
+
+
+#define THIS_FILE "sip_resolve.c"
+
+#define ADDR_MAX_COUNT 8
+
+struct naptr_target
+{
+ pj_str_t res_type; /**< e.g. "_sip._udp" */
+ pj_str_t name; /**< Domain name. */
+ pjsip_transport_type_e type; /**< Transport type. */
+ unsigned order; /**< Order */
+ unsigned pref; /**< Preference. */
+};
+
+struct query
+{
+ char *objname;
+
+ pj_dns_type query_type;
+ void *token;
+ pjsip_resolver_callback *cb;
+ pj_dns_async_query *object;
+ pj_status_t last_error;
+
+ /* Original request: */
+ struct {
+ pjsip_host_info target;
+ unsigned def_port;
+ } req;
+
+ /* NAPTR records: */
+ unsigned naptr_cnt;
+ struct naptr_target naptr[8];
+};
+
+
+struct pjsip_resolver_t
+{
+ pj_dns_resolver *res;
+};
+
+
+static void srv_resolver_cb(void *user_data,
+ pj_status_t status,
+ const pj_dns_srv_record *rec);
+static void dns_a_callback(void *user_data,
+ pj_status_t status,
+ pj_dns_parsed_packet *response);
+
+
+/*
+ * Public API to create the resolver.
+ */
+PJ_DEF(pj_status_t) pjsip_resolver_create( pj_pool_t *pool,
+ pjsip_resolver_t **p_res)
+{
+ pjsip_resolver_t *resolver;
+
+ PJ_ASSERT_RETURN(pool && p_res, PJ_EINVAL);
+ resolver = PJ_POOL_ZALLOC_T(pool, pjsip_resolver_t);
+ *p_res = resolver;
+
+ return PJ_SUCCESS;
+}
+
+
+/*
+ * Public API to set the DNS resolver instance for the SIP resolver.
+ */
+PJ_DEF(pj_status_t) pjsip_resolver_set_resolver(pjsip_resolver_t *res,
+ pj_dns_resolver *dns_res)
+{
+#if PJSIP_HAS_RESOLVER
+ res->res = dns_res;
+ return PJ_SUCCESS;
+#else
+ PJ_UNUSED_ARG(res);
+ PJ_UNUSED_ARG(dns_res);
+ pj_assert(!"Resolver is disabled (PJSIP_HAS_RESOLVER==0)");
+ return PJ_EINVALIDOP;
+#endif
+}
+
+
+/*
+ * Public API to get the internal DNS resolver.
+ */
+PJ_DEF(pj_dns_resolver*) pjsip_resolver_get_resolver(pjsip_resolver_t *res)
+{
+ return res->res;
+}
+
+
+/*
+ * Public API to create destroy the resolver
+ */
+PJ_DEF(void) pjsip_resolver_destroy(pjsip_resolver_t *resolver)
+{
+ if (resolver->res) {
+#if PJSIP_HAS_RESOLVER
+ pj_dns_resolver_destroy(resolver->res, PJ_FALSE);
+#endif
+ resolver->res = NULL;
+ }
+}
+
+/*
+ * Internal:
+ * determine if an address is a valid IP address, and if it is,
+ * return the IP version (4 or 6).
+ */
+static int get_ip_addr_ver(const pj_str_t *host)
+{
+ pj_in_addr dummy;
+ pj_in6_addr dummy6;
+
+ /* First check with inet_aton() */
+ if (pj_inet_aton(host, &dummy) > 0)
+ return 4;
+
+ /* Then check if this is an IPv6 address */
+ if (pj_inet_pton(pj_AF_INET6(), host, &dummy6) == PJ_SUCCESS)
+ return 6;
+
+ /* Not an IP address */
+ return 0;
+}
+
+
+/*
+ * This is the main function for performing server resolution.
+ */
+PJ_DEF(void) pjsip_resolve( pjsip_resolver_t *resolver,
+ pj_pool_t *pool,
+ const pjsip_host_info *target,
+ void *token,
+ pjsip_resolver_callback *cb)
+{
+ pjsip_server_addresses svr_addr;
+ pj_status_t status = PJ_SUCCESS;
+ int ip_addr_ver;
+ struct query *query;
+ pjsip_transport_type_e type = target->type;
+
+ /* Is it IP address or hostname? And if it's an IP, which version? */
+ ip_addr_ver = get_ip_addr_ver(&target->addr.host);
+
+ /* Set the transport type if not explicitly specified.
+ * RFC 3263 section 4.1 specify rules to set up this.
+ */
+ if (type == PJSIP_TRANSPORT_UNSPECIFIED) {
+ if (ip_addr_ver || (target->addr.port != 0)) {
+#if PJ_HAS_TCP
+ if (target->flag & PJSIP_TRANSPORT_SECURE)
+ {
+ type = PJSIP_TRANSPORT_TLS;
+ } else if (target->flag & PJSIP_TRANSPORT_RELIABLE)
+ {
+ type = PJSIP_TRANSPORT_TCP;
+ } else
+#endif
+ {
+ type = PJSIP_TRANSPORT_UDP;
+ }
+ } else {
+ /* No type or explicit port is specified, and the address is
+ * not IP address.
+ * In this case, full NAPTR resolution must be performed.
+ * But we don't support it (yet).
+ */
+#if PJ_HAS_TCP
+ if (target->flag & PJSIP_TRANSPORT_SECURE)
+ {
+ type = PJSIP_TRANSPORT_TLS;
+ } else if (target->flag & PJSIP_TRANSPORT_RELIABLE)
+ {
+ type = PJSIP_TRANSPORT_TCP;
+ } else
+#endif
+ {
+ type = PJSIP_TRANSPORT_UDP;
+ }
+ }
+
+ /* Add IPv6 flag for IPv6 address */
+ if (ip_addr_ver == 6)
+ type = (pjsip_transport_type_e)((int)type + PJSIP_TRANSPORT_IPV6);
+ }
+
+
+ /* If target is an IP address, or if resolver is not configured,
+ * we can just finish the resolution now using pj_gethostbyname()
+ */
+ if (ip_addr_ver || resolver->res == NULL) {
+ char addr_str[PJ_INET6_ADDRSTRLEN+10];
+ pj_uint16_t srv_port;
+
+ if (ip_addr_ver != 0) {
+ /* Target is an IP address, no need to resolve */
+ if (ip_addr_ver == 4) {
+ pj_sockaddr_init(pj_AF_INET(), &svr_addr.entry[0].addr,
+ NULL, 0);
+ pj_inet_aton(&target->addr.host,
+ &svr_addr.entry[0].addr.ipv4.sin_addr);
+ } else {
+ pj_sockaddr_init(pj_AF_INET6(), &svr_addr.entry[0].addr,
+ NULL, 0);
+ pj_inet_pton(pj_AF_INET6(), &target->addr.host,
+ &svr_addr.entry[0].addr.ipv6.sin6_addr);
+ }
+ } else {
+ pj_addrinfo ai;
+ unsigned count;
+ int af;
+
+ PJ_LOG(5,(THIS_FILE,
+ "DNS resolver not available, target '%.*s:%d' type=%s "
+ "will be resolved with getaddrinfo()",
+ target->addr.host.slen,
+ target->addr.host.ptr,
+ target->addr.port,
+ pjsip_transport_get_type_name(target->type)));
+
+ if (type & PJSIP_TRANSPORT_IPV6) {
+ af = pj_AF_INET6();
+ } else {
+ af = pj_AF_INET();
+ }
+
+ /* Resolve */
+ count = 1;
+ status = pj_getaddrinfo(af, &target->addr.host, &count, &ai);
+ if (status != PJ_SUCCESS) {
+ /* "Normalize" error to PJ_ERESOLVE. This is a special error
+ * because it will be translated to SIP status 502 by
+ * sip_transaction.c
+ */
+ status = PJ_ERESOLVE;
+ goto on_error;
+ }
+
+ svr_addr.entry[0].addr.addr.sa_family = (pj_uint16_t)af;
+ pj_memcpy(&svr_addr.entry[0].addr, &ai.ai_addr,
+ sizeof(pj_sockaddr));
+ }
+
+ /* Set the port number */
+ if (target->addr.port == 0) {
+ srv_port = (pj_uint16_t)
+ pjsip_transport_get_default_port_for_type(type);
+ } else {
+ srv_port = (pj_uint16_t)target->addr.port;
+ }
+ pj_sockaddr_set_port(&svr_addr.entry[0].addr, srv_port);
+
+ /* Call the callback. */
+ PJ_LOG(5,(THIS_FILE,
+ "Target '%.*s:%d' type=%s resolved to "
+ "'%s' type=%s (%s)",
+ (int)target->addr.host.slen,
+ target->addr.host.ptr,
+ target->addr.port,
+ pjsip_transport_get_type_name(target->type),
+ pj_sockaddr_print(&svr_addr.entry[0].addr, addr_str,
+ sizeof(addr_str), 3),
+ pjsip_transport_get_type_name(type),
+ pjsip_transport_get_type_desc(type)));
+ svr_addr.count = 1;
+ svr_addr.entry[0].priority = 0;
+ svr_addr.entry[0].weight = 0;
+ svr_addr.entry[0].type = type;
+ svr_addr.entry[0].addr_len = pj_sockaddr_get_len(&svr_addr.entry[0].addr);
+ (*cb)(status, token, &svr_addr);
+
+ /* Done. */
+ return;
+ }
+
+ /* Target is not an IP address so we need to resolve it. */
+#if PJSIP_HAS_RESOLVER
+
+ /* Build the query state */
+ query = PJ_POOL_ZALLOC_T(pool, struct query);
+ query->objname = THIS_FILE;
+ query->token = token;
+ query->cb = cb;
+ query->req.target = *target;
+ pj_strdup(pool, &query->req.target.addr.host, &target->addr.host);
+
+ /* If port is not specified, start with SRV resolution
+ * (should be with NAPTR, but we'll do that later)
+ */
+ PJ_TODO(SUPPORT_DNS_NAPTR);
+
+ /* Build dummy NAPTR entry */
+ query->naptr_cnt = 1;
+ pj_bzero(&query->naptr[0], sizeof(query->naptr[0]));
+ query->naptr[0].order = 0;
+ query->naptr[0].pref = 0;
+ query->naptr[0].type = type;
+ pj_strdup(pool, &query->naptr[0].name, &target->addr.host);
+
+
+ /* Start DNS SRV or A resolution, depending on whether port is specified */
+ if (target->addr.port == 0) {
+ query->query_type = PJ_DNS_TYPE_SRV;
+
+ query->req.def_port = 5060;
+
+ if (type == PJSIP_TRANSPORT_TLS) {
+ query->naptr[0].res_type = pj_str("_sips._tcp.");
+ query->req.def_port = 5061;
+ } else if (type == PJSIP_TRANSPORT_TCP)
+ query->naptr[0].res_type = pj_str("_sip._tcp.");
+ else if (type == PJSIP_TRANSPORT_UDP)
+ query->naptr[0].res_type = pj_str("_sip._udp.");
+ else {
+ pj_assert(!"Unknown transport type");
+ query->naptr[0].res_type = pj_str("_sip._udp.");
+
+ }
+
+ } else {
+ /* Otherwise if port is specified, start with A (or AAAA) host
+ * resolution
+ */
+ query->query_type = PJ_DNS_TYPE_A;
+ query->naptr[0].res_type.slen = 0;
+ query->req.def_port = target->addr.port;
+ }
+
+ /* Start the asynchronous query */
+ PJ_LOG(5, (query->objname,
+ "Starting async DNS %s query: target=%.*s%.*s, transport=%s, "
+ "port=%d",
+ pj_dns_get_type_name(query->query_type),
+ (int)query->naptr[0].res_type.slen,
+ query->naptr[0].res_type.ptr,
+ (int)query->naptr[0].name.slen, query->naptr[0].name.ptr,
+ pjsip_transport_get_type_name(target->type),
+ target->addr.port));
+
+ if (query->query_type == PJ_DNS_TYPE_SRV) {
+
+ status = pj_dns_srv_resolve(&query->naptr[0].name,
+ &query->naptr[0].res_type,
+ query->req.def_port, pool, resolver->res,
+ PJ_TRUE, query, &srv_resolver_cb, NULL);
+
+ } else if (query->query_type == PJ_DNS_TYPE_A) {
+
+ status = pj_dns_resolver_start_query(resolver->res,
+ &query->naptr[0].name,
+ PJ_DNS_TYPE_A, 0,
+ &dns_a_callback,
+ query, &query->object);
+
+ } else {
+ pj_assert(!"Unexpected");
+ status = PJ_EBUG;
+ }
+
+ if (status != PJ_SUCCESS)
+ goto on_error;
+
+ return;
+
+#else /* PJSIP_HAS_RESOLVER */
+ PJ_UNUSED_ARG(pool);
+ PJ_UNUSED_ARG(query);
+ PJ_UNUSED_ARG(srv_name);
+#endif /* PJSIP_HAS_RESOLVER */
+
+on_error:
+ if (status != PJ_SUCCESS) {
+ char errmsg[PJ_ERR_MSG_SIZE];
+ PJ_LOG(4,(THIS_FILE, "Failed to resolve '%.*s'. Err=%d (%s)",
+ (int)target->addr.host.slen,
+ target->addr.host.ptr,
+ status,
+ pj_strerror(status,errmsg,sizeof(errmsg)).ptr));
+ (*cb)(status, token, NULL);
+ return;
+ }
+}
+
+#if PJSIP_HAS_RESOLVER
+
+/*
+ * This callback is called when target is resolved with DNS A query.
+ */
+static void dns_a_callback(void *user_data,
+ pj_status_t status,
+ pj_dns_parsed_packet *pkt)
+{
+ struct query *query = (struct query*) user_data;
+ pjsip_server_addresses srv;
+ pj_dns_a_record rec;
+ unsigned i;
+
+ rec.addr_count = 0;
+
+ /* Parse the response */
+ if (status == PJ_SUCCESS) {
+ status = pj_dns_parse_a_response(pkt, &rec);
+ }
+
+ if (status != PJ_SUCCESS) {
+ char errmsg[PJ_ERR_MSG_SIZE];
+
+ /* Log error */
+ pj_strerror(status, errmsg, sizeof(errmsg));
+ PJ_LOG(4,(query->objname, "DNS A record resolution failed: %s",
+ errmsg));
+
+ /* Call the callback */
+ (*query->cb)(status, query->token, NULL);
+ return;
+ }
+
+ /* Build server addresses and call callback */
+ srv.count = 0;
+ for (i=0; i<rec.addr_count; ++i) {
+ srv.entry[srv.count].type = query->naptr[0].type;
+ srv.entry[srv.count].priority = 0;
+ srv.entry[srv.count].weight = 0;
+ srv.entry[srv.count].addr_len = sizeof(pj_sockaddr_in);
+ pj_sockaddr_in_init(&srv.entry[srv.count].addr.ipv4,
+ 0, (pj_uint16_t)query->req.def_port);
+ srv.entry[srv.count].addr.ipv4.sin_addr.s_addr =
+ rec.addr[i].s_addr;
+
+ ++srv.count;
+ }
+
+ /* Call the callback */
+ (*query->cb)(PJ_SUCCESS, query->token, &srv);
+}
+
+
+/* Callback to be called by DNS SRV resolution */
+static void srv_resolver_cb(void *user_data,
+ pj_status_t status,
+ const pj_dns_srv_record *rec)
+{
+ struct query *query = (struct query*) user_data;
+ pjsip_server_addresses srv;
+ unsigned i;
+
+ if (status != PJ_SUCCESS) {
+ char errmsg[PJ_ERR_MSG_SIZE];
+
+ /* Log error */
+ pj_strerror(status, errmsg, sizeof(errmsg));
+ PJ_LOG(4,(query->objname, "DNS A record resolution failed: %s",
+ errmsg));
+
+ /* Call the callback */
+ (*query->cb)(status, query->token, NULL);
+ return;
+ }
+
+ /* Build server addresses and call callback */
+ srv.count = 0;
+ for (i=0; i<rec->count; ++i) {
+ unsigned j;
+
+ for (j=0; j<rec->entry[i].server.addr_count; ++j) {
+ srv.entry[srv.count].type = query->naptr[0].type;
+ srv.entry[srv.count].priority = rec->entry[i].priority;
+ srv.entry[srv.count].weight = rec->entry[i].weight;
+ srv.entry[srv.count].addr_len = sizeof(pj_sockaddr_in);
+ pj_sockaddr_in_init(&srv.entry[srv.count].addr.ipv4,
+ 0, (pj_uint16_t)rec->entry[i].port);
+ srv.entry[srv.count].addr.ipv4.sin_addr.s_addr =
+ rec->entry[i].server.addr[j].s_addr;
+
+ ++srv.count;
+ }
+ }
+
+ /* Call the callback */
+ (*query->cb)(PJ_SUCCESS, query->token, &srv);
+}
+
+#endif /* PJSIP_HAS_RESOLVER */
+
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