int inet_dgram_opts(QemuOpts *opts, Error **errp) { struct addrinfo ai, *peer = NULL, *local = NULL; const char *addr; const char *port; int sock = -1, rc; /* lookup peer addr */ memset(&ai,0, sizeof(ai)); ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG; ai.ai_family = PF_UNSPEC; ai.ai_socktype = SOCK_DGRAM; addr = qemu_opt_get(opts, "host"); port = qemu_opt_get(opts, "port"); if (addr == NULL || strlen(addr) == 0) { addr = "localhost"; } if (port == NULL || strlen(port) == 0) { error_setg(errp, "remote port not specified"); return -1; } if (qemu_opt_get_bool(opts, "ipv4", 0)) ai.ai_family = PF_INET; if (qemu_opt_get_bool(opts, "ipv6", 0)) ai.ai_family = PF_INET6; if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) { error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, gai_strerror(rc)); return -1; } /* lookup local addr */ memset(&ai,0, sizeof(ai)); ai.ai_flags = AI_PASSIVE; ai.ai_family = peer->ai_family; ai.ai_socktype = SOCK_DGRAM; addr = qemu_opt_get(opts, "localaddr"); port = qemu_opt_get(opts, "localport"); if (addr == NULL || strlen(addr) == 0) { addr = NULL; } if (!port || strlen(port) == 0) port = "0"; if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) { error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, gai_strerror(rc)); goto err; } /* create socket */ sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol); if (sock < 0) { error_setg_errno(errp, errno, "Failed to create socket"); goto err; } socket_set_fast_reuse(sock); /* bind socket */ if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) { error_setg_errno(errp, errno, "Failed to bind socket"); goto err; } /* connect to peer */ if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) { error_setg_errno(errp, errno, "Failed to connect socket"); goto err; } freeaddrinfo(local); freeaddrinfo(peer); return sock; err: if (-1 != sock) closesocket(sock); if (local) freeaddrinfo(local); if (peer) freeaddrinfo(peer); return -1; }