/* * 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) 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) { unsigned option = PJ_TRUE; if (type & PJSIP_TRANSPORT_IPV6) { option |= PJ_DNS_SRV_FALLBACK_GETADDRINFO_IPV6; } else { option |= PJ_DNS_SRV_FALLBACK_GETADDRINFO_IPV4; } status = pj_dns_srv_resolve(&query->naptr[0].name, &query->naptr[0].res_type, query->req.def_port, pool, resolver->res, option, 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; } }
/* * 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; int af = pj_AF_UNSPEC(); /* If an external implementation has been provided use it instead */ if (resolver->ext_res) { (*resolver->ext_res->resolve)(resolver, pool, target, token, cb); return; } /* Is it IP address or hostname? And if it's an IP, which version? */ ip_addr_ver = get_ip_addr_ver(&target->addr.host); /* Initialize address family type. Unfortunately, target type doesn't * really tell the address family type, except when IPv6 flag is * explicitly set. */ #if defined(PJ_HAS_IPV6) && PJ_HAS_IPV6==1 if ((ip_addr_ver == 6) || (type & PJSIP_TRANSPORT_IPV6)) af = pj_AF_INET6(); else if (ip_addr_ver == 4) af = pj_AF_INET(); #else /* IPv6 is disabled, will resolving IPv6 address be useful? */ af = pj_AF_INET(); #endif /* 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; } } } /* 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_pton(pj_AF_INET(), &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; 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))); /* 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; } pj_sockaddr_cp(&svr_addr.entry[0].addr, &ai.ai_addr); if (af == pj_AF_UNSPEC()) af = ai.ai_addr.addr.sa_family; } /* After address resolution, update IPv6 bitflag in transport type. */ if (af == pj_AF_INET6()) type |= PJSIP_TRANSPORT_IPV6; /* 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 || type == PJSIP_TRANSPORT_TLS6) { query->naptr[0].res_type = pj_str("_sips._tcp."); query->req.def_port = 5061; } else if (type == PJSIP_TRANSPORT_TCP || type == PJSIP_TRANSPORT_TCP6) query->naptr[0].res_type = pj_str("_sip._tcp."); else if (type == PJSIP_TRANSPORT_UDP || type == PJSIP_TRANSPORT_UDP6) 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) { int opt = 0; if (af == pj_AF_UNSPEC()) opt = PJ_DNS_SRV_FALLBACK_A | PJ_DNS_SRV_FALLBACK_AAAA | PJ_DNS_SRV_RESOLVE_AAAA; else if (af == pj_AF_INET6()) opt = PJ_DNS_SRV_FALLBACK_AAAA | PJ_DNS_SRV_RESOLVE_AAAA_ONLY; else /* af == pj_AF_INET() */ opt = PJ_DNS_SRV_FALLBACK_A; status = pj_dns_srv_resolve(&query->naptr[0].name, &query->naptr[0].res_type, query->req.def_port, pool, resolver->res, opt, query, &srv_resolver_cb, NULL); } else if (query->query_type == PJ_DNS_TYPE_A) { /* Resolve DNS A record if address family is not fixed to IPv6 */ if (af != pj_AF_INET6()) { /* If there will be DNS AAAA query too, let's setup a dummy one * here, otherwise app callback may be called immediately (before * DNS AAAA query is sent) when DNS A record is available in the * cache. */ if (af == pj_AF_UNSPEC()) query->object6 = (pj_dns_async_query*)0x1; status = pj_dns_resolver_start_query(resolver->res, &query->naptr[0].name, PJ_DNS_TYPE_A, 0, &dns_a_callback, query, &query->object); } /* Resolve DNS AAAA record if address family is not fixed to IPv4 */ if (af != pj_AF_INET() && status == PJ_SUCCESS) { status = pj_dns_resolver_start_query(resolver->res, &query->naptr[0].name, PJ_DNS_TYPE_AAAA, 0, &dns_aaaa_callback, query, &query->object6); } } 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; } }