- if (!len)
- PARA_CRIT_LOG("%s", "len == 0\n");
- if (fd + 1 <= cda_size)
- cf = crypt_data_array[fd].send;
- if (cf) {
- void *private = crypt_data_array[fd].private_data;
- unsigned char *outbuf = para_malloc(len);
- (*cf)(len, (unsigned char *)buf, outbuf, private);
- ret = sendall(fd, (char *)outbuf, &len);
- free(outbuf);
- } else
- ret = sendall(fd, buf, &len);
- return ret;
+ sprintf(port, "%u", port_number);
+ /* Set up address hint structure */
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = l3type;
+ hints.ai_socktype = socktype;
+ /*
+ * getaddrinfo does not support SOCK_DCCP, so for the sake of lookup
+ * (and only then) pretend to be UDP.
+ */
+ if (l4type == IPPROTO_DCCP)
+ hints.ai_socktype = SOCK_DGRAM;
+
+ /* only use addresses available on the host */
+ hints.ai_flags = AI_ADDRCONFIG;
+ if (l3type == AF_INET6)
+ /* use v4-mapped-v6 if no v6 addresses found */
+ hints.ai_flags |= AI_V4MAPPED | AI_ALL;
+
+ if (passive && host == NULL)
+ hints.ai_flags |= AI_PASSIVE;
+
+ /* Obtain local/remote address information */
+ if ((rc = getaddrinfo(host, port, &hints, passive ? &local : &remote))) {
+ PARA_ERROR_LOG("can not resolve %s address %s#%s: %s.\n",
+ layer4_name(l4type),
+ host? host : (passive? "[loopback]" : "[localhost]"),
+ port, gai_strerror(rc));
+ return -E_ADDRESS_LOOKUP;
+ }
+
+ /* Iterate over all src/dst combination, exhausting dst first */
+ for (src = local, dst = remote; src != NULL || dst != NULL; /* no op */ ) {
+ if (src && dst && src->ai_family == AF_INET
+ && dst->ai_family == AF_INET6)
+ goto get_next_dst; /* v4 -> v6 is not possible */
+
+ sockfd = socket(src ? src->ai_family : dst->ai_family,
+ socktype, l4type);
+ if (sockfd < 0)
+ goto get_next_dst;
+
+ /*
+ * Reuse the address on passive sockets to avoid failure on
+ * restart (protocols using listen()) and when creating
+ * multiple listener instances (UDP multicast).
+ */
+ if (passive && setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
+ &on, sizeof(on)) == -1) {
+ rc = errno;
+ close(sockfd);
+ PARA_ERROR_LOG("can not set SO_REUSEADDR: %s\n",
+ strerror(rc));
+ return -ERRNO_TO_PARA_ERROR(rc);
+ }
+ flowopt_setopts(sockfd, fo);
+
+ if (src) {
+ if (bind(sockfd, src->ai_addr, src->ai_addrlen) < 0) {
+ close(sockfd);
+ goto get_next_src;
+ }
+ if (!dst) /* bind-only completed successfully */
+ break;
+ }
+
+ if (dst && connect(sockfd, dst->ai_addr, dst->ai_addrlen) == 0)
+ break; /* connection completed successfully */
+ close(sockfd);
+get_next_dst:
+ if (dst && (dst = dst->ai_next))
+ continue;
+get_next_src:
+ if (src && (src = src->ai_next)) /* restart inner loop */
+ dst = remote;
+ }
+ if (local)
+ freeaddrinfo(local);
+ if (remote)
+ freeaddrinfo(remote);
+ flowopt_cleanup(fo);
+
+ if (src == NULL && dst == NULL) {
+ rc = errno;
+ PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
+ layer4_name(l4type), host? host : (passive?
+ "[loopback]" : "[localhost]"), port);
+ return -ERRNO_TO_PARA_ERROR(rc);
+ }
+ return sockfd;