/*! * \internal * \brief tcp connection to server at specified port * \retval negative, failed to connect. * \retval positive, sock fd */ int crm_remote_tcp_connect_async(const char *host, int port, int timeout, /*ms */ int *timer_id, void *userdata, void (*callback) (void *userdata, int sock)) { char buffer[256]; struct addrinfo *res = NULL; struct addrinfo *rp = NULL; struct addrinfo hints; const char *server = host; int ret_ga; int sock = -1; /* getaddrinfo */ memset(&hints, 0, sizeof(struct addrinfo)); hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */ hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_CANONNAME; crm_debug("Looking up %s", server); ret_ga = getaddrinfo(server, NULL, &hints, &res); if (ret_ga) { crm_err("getaddrinfo: %s", gai_strerror(ret_ga)); return -1; } if (!res || !res->ai_addr) { crm_err("getaddrinfo failed"); goto async_cleanup; } for (rp = res; rp != NULL; rp = rp->ai_next) { struct sockaddr *addr = rp->ai_addr; if (!addr) { continue; } if (rp->ai_canonname) { server = res->ai_canonname; } crm_debug("Got address %s for %s", server, host); /* create socket */ sock = socket(rp->ai_family, SOCK_STREAM, IPPROTO_TCP); if (sock == -1) { crm_err("Socket creation failed for remote client connection."); continue; } memset(buffer, 0, DIMOF(buffer)); if (addr->sa_family == AF_INET6) { struct sockaddr_in6 *addr_in = (struct sockaddr_in6 *)(void*)addr; addr_in->sin6_port = htons(port); inet_ntop(addr->sa_family, &addr_in->sin6_addr, buffer, DIMOF(buffer)); } else { struct sockaddr_in *addr_in = (struct sockaddr_in *)(void*)addr; addr_in->sin_port = htons(port); inet_ntop(addr->sa_family, &addr_in->sin_addr, buffer, DIMOF(buffer)); } crm_info("Attempting to connect to remote server at %s:%d", buffer, port); if (callback) { if (internal_tcp_connect_async (sock, rp->ai_addr, rp->ai_addrlen, timeout, timer_id, userdata, callback) == 0) { goto async_cleanup; /* Success for now, we'll hear back later in the callback */ } } else { if (internal_tcp_connect(sock, rp->ai_addr, rp->ai_addrlen) == 0) { break; /* Success */ } } close(sock); sock = -1; } async_cleanup: if (res) { freeaddrinfo(res); } return sock; }
/*! * \internal * \brief Connect to server at specified TCP port * * \param[in] host Name of server to connect to * \param[in] port Server port to connect to * \param[in] timeout Report error if not connected in this many milliseconds * \param[out] timer_id If non-NULL, will be set to timer ID, if asynchronous * \param[in] userdata Data to pass to callback, if asynchronous * \param[in] callback If non-NULL, connect asynchronously then call this * * \return File descriptor of connected socket on success, -ENOTCONN otherwise */ int crm_remote_tcp_connect_async(const char *host, int port, int timeout, int *timer_id, void *userdata, void (*callback) (void *userdata, int sock)) { char buffer[INET6_ADDRSTRLEN]; struct addrinfo *res = NULL; struct addrinfo *rp = NULL; struct addrinfo hints; const char *server = host; int ret_ga; int sock = -ENOTCONN; // Get host's IP address(es) memset(&hints, 0, sizeof(struct addrinfo)); hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */ hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_CANONNAME; ret_ga = getaddrinfo(server, NULL, &hints, &res); if (ret_ga) { crm_err("Unable to get IP address info for %s: %s", server, gai_strerror(ret_ga)); goto async_cleanup; } if (!res || !res->ai_addr) { crm_err("Unable to get IP address info for %s: no result", server); goto async_cleanup; } // getaddrinfo() returns a list of host's addresses, try them in order for (rp = res; rp != NULL; rp = rp->ai_next) { struct sockaddr *addr = rp->ai_addr; if (!addr) { continue; } if (rp->ai_canonname) { server = res->ai_canonname; } crm_debug("Got canonical name %s for %s", server, host); sock = socket(rp->ai_family, SOCK_STREAM, IPPROTO_TCP); if (sock == -1) { crm_perror(LOG_WARNING, "creating socket for connection to %s", server); sock = -ENOTCONN; continue; } /* Set port appropriately for address family */ /* (void*) casts avoid false-positive compiler alignment warnings */ if (addr->sa_family == AF_INET6) { ((struct sockaddr_in6 *)(void*)addr)->sin6_port = htons(port); } else { ((struct sockaddr_in *)(void*)addr)->sin_port = htons(port); } memset(buffer, 0, DIMOF(buffer)); crm_sockaddr2str(addr, buffer); crm_info("Attempting TCP connection to %s:%d", buffer, port); if (callback) { if (internal_tcp_connect_async (sock, rp->ai_addr, rp->ai_addrlen, timeout, timer_id, userdata, callback) == 0) { goto async_cleanup; /* Success for now, we'll hear back later in the callback */ } } else if (internal_tcp_connect(sock, rp->ai_addr, rp->ai_addrlen) == 0) { break; /* Success */ } close(sock); sock = -ENOTCONN; } async_cleanup: if (res) { freeaddrinfo(res); } return sock; }