diff options
-rw-r--r-- | pjlib-util/src/pjlib-util/resolver.c | 142 |
1 files changed, 91 insertions, 51 deletions
diff --git a/pjlib-util/src/pjlib-util/resolver.c b/pjlib-util/src/pjlib-util/resolver.c index b80fd2e5..b6576fd6 100644 --- a/pjlib-util/src/pjlib-util/resolver.c +++ b/pjlib-util/src/pjlib-util/resolver.c @@ -180,7 +180,8 @@ struct pj_dns_resolver unsigned char udp_rx_pkt[UDPSZ];/**< UDP receive buffer. */ unsigned char udp_tx_pkt[UDPSZ];/**< UDP receive buffer. */ pj_ssize_t udp_len; /**< Length of received packet. */ - pj_ioqueue_op_key_t udp_op_key; /**< UDP read operation key. */ + pj_ioqueue_op_key_t udp_op_rx_key; /**< UDP read operation key. */ + pj_ioqueue_op_key_t udp_op_tx_key; /**< UDP write operation key. */ pj_sockaddr_in udp_src_addr; /**< Source address of packet */ int udp_addr_len; /**< Source address length. */ @@ -223,6 +224,63 @@ static pj_status_t select_nameservers(pj_dns_resolver *resolver, unsigned servers[]); +/* Close UDP socket */ +static void close_sock(pj_dns_resolver *resv) +{ + /* Close existing socket */ + if (resv->udp_key != NULL) { + pj_ioqueue_unregister(resv->udp_key); + resv->udp_key = NULL; + resv->udp_sock = PJ_INVALID_SOCKET; + } else if (resv->udp_sock != PJ_INVALID_SOCKET) { + pj_sock_close(resv->udp_sock); + resv->udp_sock = PJ_INVALID_SOCKET; + } +} + + +/* Initialize UDP socket */ +static pj_status_t init_sock(pj_dns_resolver *resv) +{ + pj_ioqueue_callback socket_cb; + pj_status_t status; + + /* Create the UDP socket */ + status = pj_sock_socket(pj_AF_INET(), pj_SOCK_DGRAM(), 0, &resv->udp_sock); + if (status != PJ_SUCCESS) + return status; + + /* Bind to any address/port */ + status = pj_sock_bind_in(resv->udp_sock, 0, 0); + if (status != PJ_SUCCESS) + return status; + + /* Register to ioqueue */ + pj_bzero(&socket_cb, sizeof(socket_cb)); + socket_cb.on_read_complete = &on_read_complete; + status = pj_ioqueue_register_sock(resv->pool, resv->ioqueue, + resv->udp_sock, resv, &socket_cb, + &resv->udp_key); + if (status != PJ_SUCCESS) + return status; + + pj_ioqueue_op_key_init(&resv->udp_op_rx_key, sizeof(resv->udp_op_rx_key)); + pj_ioqueue_op_key_init(&resv->udp_op_tx_key, sizeof(resv->udp_op_tx_key)); + + /* Start asynchronous read to the UDP socket */ + resv->udp_len = sizeof(resv->udp_rx_pkt); + resv->udp_addr_len = sizeof(resv->udp_src_addr); + status = pj_ioqueue_recvfrom(resv->udp_key, &resv->udp_op_rx_key, + resv->udp_rx_pkt, &resv->udp_len, + PJ_IOQUEUE_ALWAYS_ASYNC, + &resv->udp_src_addr, &resv->udp_addr_len); + if (status != PJ_EPENDING) + return status; + + return PJ_SUCCESS; +} + + /* Initialize DNS settings with default values */ PJ_DEF(void) pj_dns_settings_default(pj_dns_settings *s) { @@ -247,7 +305,6 @@ PJ_DEF(pj_status_t) pj_dns_resolver_create( pj_pool_factory *pf, { pj_pool_t *pool; pj_dns_resolver *resv; - pj_ioqueue_callback socket_cb; pj_status_t status; /* Sanity check */ @@ -302,37 +359,11 @@ PJ_DEF(pj_status_t) pj_dns_resolver_create( pj_pool_factory *pf, resv->hquerybyres = pj_hash_create(pool, Q_HASH_TABLE_SIZE); pj_list_init(&resv->query_free_nodes); - /* Create the UDP socket */ - status = pj_sock_socket(pj_AF_INET(), pj_SOCK_DGRAM(), 0, &resv->udp_sock); - if (status != PJ_SUCCESS) - goto on_error; - - /* Bind to any address/port */ - status = pj_sock_bind_in(resv->udp_sock, 0, 0); - if (status != PJ_SUCCESS) - goto on_error; - - /* Register to ioqueue */ - pj_bzero(&socket_cb, sizeof(socket_cb)); - socket_cb.on_read_complete = &on_read_complete; - status = pj_ioqueue_register_sock(pool, resv->ioqueue, resv->udp_sock, - resv, &socket_cb, &resv->udp_key); + /* Initialize the UDP socket */ + status = init_sock(resv); if (status != PJ_SUCCESS) goto on_error; - pj_ioqueue_op_key_init(&resv->udp_op_key, sizeof(resv->udp_op_key)); - - /* Start asynchronous read to the UDP socket */ - resv->udp_len = sizeof(resv->udp_rx_pkt); - resv->udp_addr_len = sizeof(resv->udp_src_addr); - status = pj_ioqueue_recvfrom(resv->udp_key, &resv->udp_op_key, - resv->udp_rx_pkt, &resv->udp_len, - PJ_IOQUEUE_ALWAYS_ASYNC, - &resv->udp_src_addr, &resv->udp_addr_len); - if (status != PJ_EPENDING) - goto on_error; - - /* Looks like everything is okay */ *p_resolver = resv; return PJ_SUCCESS; @@ -392,14 +423,7 @@ PJ_DEF(pj_status_t) pj_dns_resolver_destroy( pj_dns_resolver *resolver, resolver->timer = NULL; } - if (resolver->udp_key != NULL) { - pj_ioqueue_unregister(resolver->udp_key); - resolver->udp_key = NULL; - resolver->udp_sock = PJ_INVALID_SOCKET; - } else if (resolver->udp_sock != PJ_INVALID_SOCKET) { - pj_sock_close(resolver->udp_sock); - resolver->udp_sock = PJ_INVALID_SOCKET; - } + close_sock(resolver); if (resolver->own_ioqueue && resolver->ioqueue) { pj_ioqueue_destroy(resolver->ioqueue); @@ -561,15 +585,6 @@ static pj_status_t transmit_query(pj_dns_resolver *resolver, pj_time_val delay; pj_status_t status; - /* Create DNS query packet */ - pkt_size = sizeof(resolver->udp_tx_pkt); - name = pj_str(q->key.name); - status = pj_dns_make_query(resolver->udp_tx_pkt, &pkt_size, - q->id, q->key.qtype, &name); - if (status != PJ_SUCCESS) { - return status; - } - /* Select which nameserver(s) to send requests to. */ server_cnt = PJ_ARRAY_SIZE(servers); status = select_nameservers(resolver, &server_cnt, servers); @@ -595,6 +610,28 @@ static pj_status_t transmit_query(pj_dns_resolver *resolver, return status; } + /* Check if the socket is available for sending */ + if (pj_ioqueue_is_pending(resolver->udp_key, &resolver->udp_op_tx_key)) { + ++q->transmit_cnt; + PJ_LOG(4,(resolver->name.ptr, + "Socket busy in transmitting DNS %s query for %s%s", + pj_dns_get_type_name(q->key.qtype), + q->key.name, + (q->transmit_cnt < resolver->settings.qretr_count? + ", will try again later":""))); + return PJ_SUCCESS; + } + + /* Create DNS query packet */ + pkt_size = sizeof(resolver->udp_tx_pkt); + name = pj_str(q->key.name); + status = pj_dns_make_query(resolver->udp_tx_pkt, &pkt_size, + q->id, q->key.qtype, &name); + if (status != PJ_SUCCESS) { + pj_timer_heap_cancel(resolver->timer, &q->timer_entry); + return status; + } + /* Get current time. */ pj_gettimeofday(&now); @@ -603,13 +640,16 @@ static pj_status_t transmit_query(pj_dns_resolver *resolver, pj_ssize_t sent = (pj_ssize_t) pkt_size; struct nameserver *ns = &resolver->ns[servers[i]]; - pj_sock_sendto(resolver->udp_sock, resolver->udp_tx_pkt, &sent, 0, - &resolver->ns[servers[i]].addr, sizeof(pj_sockaddr_in)); + status = pj_ioqueue_sendto(resolver->udp_key, + &resolver->udp_op_tx_key, + resolver->udp_tx_pkt, &sent, 0, + &resolver->ns[servers[i]].addr, + sizeof(pj_sockaddr_in)); - PJ_LOG(4,(resolver->name.ptr, + PJ_PERROR(4,(resolver->name.ptr, status, "%s %d bytes to NS %d (%s:%d): DNS %s query for %s", (q->transmit_cnt==0? "Transmitting":"Re-transmitting"), - (int)sent, servers[i], + (int)pkt_size, servers[i], pj_inet_ntoa(ns->addr.sin_addr), (int)pj_ntohs(ns->addr.sin_port), pj_dns_get_type_name(q->key.qtype), |