| /* |
| * socket.c |
| * |
| * Copyright (C) 2012-2020 Nikias Bassen <nikias@gmx.li> |
| * Copyright (C) 2012 Martin Szulecki <m.szulecki@libimobiledevice.org> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| #include <stdio.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <sys/time.h> |
| #include <sys/stat.h> |
| #ifdef WIN32 |
| #include <winsock2.h> |
| #include <ws2tcpip.h> |
| #include <windows.h> |
| static int wsa_init = 0; |
| #else |
| #include <sys/socket.h> |
| #include <sys/un.h> |
| #include <netinet/in.h> |
| #include <netinet/tcp.h> |
| #include <netdb.h> |
| #include <arpa/inet.h> |
| #include <fcntl.h> |
| #ifdef AF_INET6 |
| #include <net/if.h> |
| #include <ifaddrs.h> |
| #endif |
| #endif |
| #include "socket.h" |
| |
| #define RECV_TIMEOUT 20000 |
| #define SEND_TIMEOUT 10000 |
| #define CONNECT_TIMEOUT 5000 |
| |
| #ifndef EAFNOSUPPORT |
| #define EAFNOSUPPORT 102 |
| #endif |
| #ifndef ECONNRESET |
| #define ECONNRESET 108 |
| #endif |
| #ifndef ETIMEDOUT |
| #define ETIMEDOUT 138 |
| #endif |
| |
| static int verbose = 0; |
| |
| void socket_set_verbose(int level) |
| { |
| verbose = level; |
| } |
| |
| const char *socket_addr_to_string(struct sockaddr *addr, char *addr_out, size_t addr_out_size) |
| { |
| #ifdef WIN32 |
| WSADATA wsa_data; |
| if (!wsa_init) { |
| if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) { |
| fprintf(stderr, "WSAStartup failed!\n"); |
| ExitProcess(-1); |
| } |
| wsa_init = 1; |
| } |
| DWORD addr_out_len = addr_out_size; |
| DWORD addrlen = 0; |
| |
| if (addr->sa_family == AF_INET) { |
| addrlen = sizeof(struct sockaddr_in); |
| } |
| #ifdef AF_INET6 |
| else if (addr->sa_family == AF_INET6) { |
| addrlen = sizeof(struct sockaddr_in6); |
| } |
| #endif |
| else { |
| errno = EAFNOSUPPORT; |
| return NULL; |
| } |
| |
| if (WSAAddressToString(addr, addrlen, NULL, addr_out, &addr_out_len) == 0) { |
| return addr_out; |
| } |
| #else |
| const void *addrdata = NULL; |
| |
| if (addr->sa_family == AF_INET) { |
| addrdata = &((struct sockaddr_in*)addr)->sin_addr; |
| } |
| #ifdef AF_INET6 |
| else if (addr->sa_family == AF_INET6) { |
| addrdata = &((struct sockaddr_in6*)addr)->sin6_addr; |
| } |
| #endif |
| else { |
| errno = EAFNOSUPPORT; |
| return NULL; |
| } |
| |
| if (inet_ntop(addr->sa_family, addrdata, addr_out, addr_out_size)) { |
| return addr_out; |
| } |
| #endif |
| return NULL; |
| } |
| |
| #ifndef WIN32 |
| int socket_create_unix(const char *filename) |
| { |
| struct sockaddr_un name; |
| int sock; |
| #ifdef SO_NOSIGPIPE |
| int yes = 1; |
| #endif |
| |
| // remove if still present |
| unlink(filename); |
| |
| /* Create the socket. */ |
| sock = socket(PF_UNIX, SOCK_STREAM, 0); |
| if (sock < 0) { |
| perror("socket"); |
| return -1; |
| } |
| |
| #ifdef SO_NOSIGPIPE |
| if (setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sock); |
| return -1; |
| } |
| #endif |
| |
| /* Bind a name to the socket. */ |
| name.sun_family = AF_UNIX; |
| strncpy(name.sun_path, filename, sizeof(name.sun_path)); |
| name.sun_path[sizeof(name.sun_path) - 1] = '\0'; |
| |
| if (bind(sock, (struct sockaddr*)&name, sizeof(name)) < 0) { |
| perror("bind"); |
| socket_close(sock); |
| return -1; |
| } |
| |
| if (listen(sock, 100) < 0) { |
| perror("listen"); |
| socket_close(sock); |
| return -1; |
| } |
| |
| return sock; |
| } |
| |
| int socket_connect_unix(const char *filename) |
| { |
| struct sockaddr_un name; |
| int sfd = -1; |
| struct stat fst; |
| #ifdef SO_NOSIGPIPE |
| int yes = 1; |
| #endif |
| int bufsize = 0x20000; |
| |
| // check if socket file exists... |
| if (stat(filename, &fst) != 0) { |
| if (verbose >= 2) |
| fprintf(stderr, "%s: stat '%s': %s\n", __func__, filename, |
| strerror(errno)); |
| return -1; |
| } |
| // ... and if it is a unix domain socket |
| if (!S_ISSOCK(fst.st_mode)) { |
| if (verbose >= 2) |
| fprintf(stderr, "%s: File '%s' is not a socket!\n", __func__, |
| filename); |
| return -1; |
| } |
| // make a new socket |
| if ((sfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { |
| if (verbose >= 2) |
| fprintf(stderr, "%s: socket: %s\n", __func__, strerror(errno)); |
| return -1; |
| } |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, (void*)&bufsize, sizeof(int)) == -1) { |
| perror("Could not set send buffer for socket"); |
| } |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_RCVBUF, (void*)&bufsize, sizeof(int)) == -1) { |
| perror("Could not set receive buffer for socket"); |
| } |
| |
| #ifdef SO_NOSIGPIPE |
| if (setsockopt(sfd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sfd); |
| return -1; |
| } |
| #endif |
| // and connect to 'filename' |
| name.sun_family = AF_UNIX; |
| strncpy(name.sun_path, filename, sizeof(name.sun_path)); |
| name.sun_path[sizeof(name.sun_path) - 1] = 0; |
| |
| int flags = fcntl(sfd, F_GETFL, 0); |
| fcntl(sfd, F_SETFL, flags | O_NONBLOCK); |
| |
| do { |
| if (connect(sfd, (struct sockaddr*)&name, sizeof(name)) != -1) { |
| break; |
| } |
| if (errno == EINPROGRESS) { |
| fd_set fds; |
| FD_ZERO(&fds); |
| FD_SET(sfd, &fds); |
| |
| struct timeval timeout; |
| timeout.tv_sec = CONNECT_TIMEOUT / 1000; |
| timeout.tv_usec = (CONNECT_TIMEOUT - (timeout.tv_sec * 1000)) * 1000; |
| if (select(sfd + 1, NULL, &fds, NULL, &timeout) == 1) { |
| int so_error; |
| socklen_t len = sizeof(so_error); |
| getsockopt(sfd, SOL_SOCKET, SO_ERROR, (void*)&so_error, &len); |
| if (so_error == 0) { |
| break; |
| } |
| } |
| } |
| socket_close(sfd); |
| sfd = -1; |
| } while (0); |
| |
| if (sfd < 0) { |
| if (verbose >= 2) |
| fprintf(stderr, "%s: connect: %s\n", __func__, strerror(errno)); |
| return -1; |
| } |
| |
| return sfd; |
| } |
| #endif |
| |
| int socket_create(const char* addr, uint16_t port) |
| { |
| int sfd = -1; |
| int yes = 1; |
| struct addrinfo hints; |
| struct addrinfo *result, *rp; |
| char portstr[8]; |
| int res; |
| #ifdef WIN32 |
| WSADATA wsa_data; |
| if (!wsa_init) { |
| if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) { |
| fprintf(stderr, "WSAStartup failed!\n"); |
| ExitProcess(-1); |
| } |
| wsa_init = 1; |
| } |
| #endif |
| |
| memset(&hints, '\0', sizeof(struct addrinfo)); |
| hints.ai_family = AF_UNSPEC; |
| hints.ai_socktype = SOCK_STREAM; |
| hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV; |
| hints.ai_protocol = IPPROTO_TCP; |
| |
| sprintf(portstr, "%d", port); |
| |
| if (!addr) { |
| addr = "localhost"; |
| } |
| res = getaddrinfo(addr, portstr, &hints, &result); |
| if (res != 0) { |
| fprintf(stderr, "%s: getaddrinfo: %s\n", __func__, gai_strerror(res)); |
| return -1; |
| } |
| |
| for (rp = result; rp != NULL; rp = rp->ai_next) { |
| sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); |
| if (sfd == -1) { |
| continue; |
| } |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sfd); |
| continue; |
| } |
| |
| #ifdef SO_NOSIGPIPE |
| if (setsockopt(sfd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sfd); |
| continue; |
| } |
| #endif |
| |
| #if defined(AF_INET6) && defined(IPV6_V6ONLY) |
| if (rp->ai_family == AF_INET6) { |
| if (setsockopt(sfd, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt() IPV6_V6ONLY"); |
| } |
| } |
| #endif |
| |
| if (bind(sfd, rp->ai_addr, rp->ai_addrlen) < 0) { |
| perror("bind()"); |
| socket_close(sfd); |
| continue; |
| } |
| |
| if (listen(sfd, 100) < 0) { |
| perror("listen()"); |
| socket_close(sfd); |
| continue; |
| } |
| break; |
| } |
| |
| freeaddrinfo(result); |
| |
| if (rp == NULL) { |
| return -1; |
| } |
| |
| return sfd; |
| } |
| |
| #ifdef AF_INET6 |
| static uint32_t _in6_addr_scope(struct in6_addr* addr) |
| { |
| uint32_t scope = 0; |
| |
| if (IN6_IS_ADDR_MULTICAST(addr)) { |
| if (IN6_IS_ADDR_MC_NODELOCAL(addr)) { |
| scope = 1; |
| } else if (IN6_IS_ADDR_MC_LINKLOCAL(addr)) { |
| scope = 2; |
| } else if (IN6_IS_ADDR_MC_SITELOCAL(addr)) { |
| scope = 5; |
| } |
| |
| return scope; |
| } |
| |
| if (IN6_IS_ADDR_LINKLOCAL(addr)) { |
| scope = 2; |
| } else if (IN6_IS_ADDR_LOOPBACK(addr)) { |
| scope = 2; |
| } else if (IN6_IS_ADDR_SITELOCAL(addr)) { |
| scope = 5; |
| } else if (IN6_IS_ADDR_UNSPECIFIED(addr)) { |
| scope = 0; |
| } |
| |
| return scope; |
| } |
| |
| static int32_t _sockaddr_in6_scope_id(struct sockaddr_in6* addr) |
| { |
| int32_t res = -1; |
| struct ifaddrs *ifaddr, *ifa; |
| uint32_t addr_scope; |
| |
| /* get scope for requested address */ |
| addr_scope = _in6_addr_scope(&addr->sin6_addr); |
| if (addr_scope == 0) { |
| /* global scope doesn't need a specific scope id */ |
| return addr_scope; |
| } |
| |
| /* get interfaces */ |
| if (getifaddrs(&ifaddr) == -1) { |
| perror("getifaddrs"); |
| return res; |
| } |
| |
| /* loop over interfaces */ |
| for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { |
| /* skip if no address is available */ |
| if (ifa->ifa_addr == NULL) { |
| continue; |
| } |
| |
| /* skip if wrong family */ |
| if (ifa->ifa_addr->sa_family != AF_INET6) { |
| continue; |
| } |
| |
| /* skip if not up */ |
| if ((ifa->ifa_flags & IFF_UP) == 0) { |
| continue; |
| } |
| |
| /* skip if not running */ |
| if ((ifa->ifa_flags & IFF_RUNNING) == 0) { |
| continue; |
| } |
| |
| struct sockaddr_in6* addr_in = (struct sockaddr_in6*)ifa->ifa_addr; |
| |
| /* skip if scopes do not match */ |
| if (_in6_addr_scope(&addr_in->sin6_addr) != addr_scope) { |
| continue; |
| } |
| |
| /* use if address is equal */ |
| if (memcmp(&addr->sin6_addr.s6_addr, &addr_in->sin6_addr.s6_addr, sizeof(addr_in->sin6_addr.s6_addr)) == 0) { |
| /* if scope id equals the requested one then assume it was valid */ |
| if (addr->sin6_scope_id == addr_in->sin6_scope_id) { |
| res = addr_in->sin6_scope_id; |
| break; |
| } else { |
| if ((addr_in->sin6_scope_id > addr->sin6_scope_id) && (res >= 0)) { |
| // use last valid scope id as we're past the requested scope id |
| break; |
| } |
| res = addr_in->sin6_scope_id; |
| continue; |
| } |
| } |
| |
| /* skip loopback interface if not already matched exactly above */ |
| if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) { |
| continue; |
| } |
| |
| if ((addr_in->sin6_scope_id > addr->sin6_scope_id) && (res >= 0)) { |
| // use last valid scope id as we're past the requested scope id |
| break; |
| } |
| |
| res = addr_in->sin6_scope_id; |
| |
| /* if scope id equals the requested one then assume it was valid */ |
| if (addr->sin6_scope_id == addr_in->sin6_scope_id) { |
| /* set the scope id of this interface as most likely candidate */ |
| break; |
| } |
| } |
| |
| freeifaddrs(ifaddr); |
| |
| return res; |
| } |
| #endif |
| |
| int socket_connect_addr(struct sockaddr* addr, uint16_t port) |
| { |
| int sfd = -1; |
| int yes = 1; |
| int bufsize = 0x20000; |
| int addrlen = 0; |
| #ifdef WIN32 |
| u_long l_yes = 1; |
| WSADATA wsa_data; |
| if (!wsa_init) { |
| if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) { |
| fprintf(stderr, "WSAStartup failed!\n"); |
| ExitProcess(-1); |
| } |
| wsa_init = 1; |
| } |
| #endif |
| |
| if (addr->sa_family == AF_INET) { |
| struct sockaddr_in* addr_in = (struct sockaddr_in*)addr; |
| addr_in->sin_port = htons(port); |
| addrlen = sizeof(struct sockaddr_in); |
| } |
| #ifdef AF_INET6 |
| else if (addr->sa_family == AF_INET6) { |
| struct sockaddr_in6* addr_in = (struct sockaddr_in6*)addr; |
| addr_in->sin6_port = htons(port); |
| |
| /* |
| * IPv6 Routing Magic: |
| * |
| * If the scope of the address is a link-local one, IPv6 requires the |
| * scope id set to an interface number to allow proper routing. However, |
| * as the provided sockaddr might contain a wrong scope id, we must find |
| * a scope id from a suitable interface on this system or routing might |
| * fail. An IPv6 guru should have another look though... |
| */ |
| addr_in->sin6_scope_id = _sockaddr_in6_scope_id(addr_in); |
| |
| addrlen = sizeof(struct sockaddr_in6); |
| } |
| #endif |
| else { |
| fprintf(stderr, "ERROR: Unsupported address family"); |
| return -1; |
| } |
| |
| sfd = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP); |
| if (sfd == -1) { |
| perror("socket()"); |
| return -1; |
| } |
| |
| #ifdef SO_NOSIGPIPE |
| if (setsockopt(sfd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sfd); |
| return -1; |
| } |
| #endif |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sfd); |
| return -1; |
| } |
| |
| #ifdef WIN32 |
| ioctlsocket(sfd, FIONBIO, &l_yes); |
| #else |
| int flags = fcntl(sfd, F_GETFL, 0); |
| fcntl(sfd, F_SETFL, flags | O_NONBLOCK); |
| #endif |
| |
| do { |
| if (connect(sfd, addr, addrlen) != -1) { |
| break; |
| } |
| #ifdef WIN32 |
| if (WSAGetLastError() == WSAEWOULDBLOCK) |
| #else |
| if (errno == EINPROGRESS) |
| #endif |
| { |
| fd_set fds; |
| FD_ZERO(&fds); |
| FD_SET(sfd, &fds); |
| |
| struct timeval timeout; |
| timeout.tv_sec = CONNECT_TIMEOUT / 1000; |
| timeout.tv_usec = (CONNECT_TIMEOUT - (timeout.tv_sec * 1000)) * 1000; |
| if (select(sfd + 1, NULL, &fds, NULL, &timeout) == 1) { |
| int so_error; |
| socklen_t len = sizeof(so_error); |
| getsockopt(sfd, SOL_SOCKET, SO_ERROR, (void*)&so_error, &len); |
| if (so_error == 0) { |
| errno = 0; |
| break; |
| } |
| errno = so_error; |
| } |
| } |
| socket_close(sfd); |
| sfd = -1; |
| } while (0); |
| |
| if (sfd < 0) { |
| if (verbose >= 2) { |
| char addrtxt[48]; |
| socket_addr_to_string(addr, addrtxt, sizeof(addrtxt)); |
| fprintf(stderr, "%s: Could not connect to %s port %d\n", __func__, addrtxt, port); |
| } |
| return -1; |
| } |
| |
| if (setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (void*)&yes, sizeof(int)) == -1) { |
| perror("Could not set TCP_NODELAY on socket"); |
| } |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, (void*)&bufsize, sizeof(int)) == -1) { |
| perror("Could not set send buffer for socket"); |
| } |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_RCVBUF, (void*)&bufsize, sizeof(int)) == -1) { |
| perror("Could not set receive buffer for socket"); |
| } |
| |
| return sfd; |
| } |
| |
| int socket_connect(const char *addr, uint16_t port) |
| { |
| int sfd = -1; |
| int yes = 1; |
| int bufsize = 0x20000; |
| struct addrinfo hints; |
| struct addrinfo *result, *rp; |
| char portstr[8]; |
| int res; |
| #ifdef WIN32 |
| u_long l_yes = 1; |
| WSADATA wsa_data; |
| if (!wsa_init) { |
| if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) { |
| fprintf(stderr, "WSAStartup failed!\n"); |
| ExitProcess(-1); |
| } |
| wsa_init = 1; |
| } |
| #else |
| int flags = 0; |
| #endif |
| |
| if (!addr) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| memset(&hints, '\0', sizeof(struct addrinfo)); |
| hints.ai_family = AF_UNSPEC; |
| hints.ai_socktype = SOCK_STREAM; |
| hints.ai_flags = AI_NUMERICSERV; |
| hints.ai_protocol = IPPROTO_TCP; |
| |
| sprintf(portstr, "%d", port); |
| |
| res = getaddrinfo(addr, portstr, &hints, &result); |
| if (res != 0) { |
| fprintf(stderr, "%s: getaddrinfo: %s\n", __func__, gai_strerror(res)); |
| return -1; |
| } |
| |
| for (rp = result; rp != NULL; rp = rp->ai_next) { |
| sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); |
| if (sfd == -1) { |
| continue; |
| } |
| |
| #ifdef SO_NOSIGPIPE |
| if (setsockopt(sfd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sfd); |
| return -1; |
| } |
| #endif |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(int)) == -1) { |
| perror("setsockopt()"); |
| socket_close(sfd); |
| continue; |
| } |
| |
| #ifdef WIN32 |
| ioctlsocket(sfd, FIONBIO, &l_yes); |
| #else |
| flags = fcntl(sfd, F_GETFL, 0); |
| fcntl(sfd, F_SETFL, flags | O_NONBLOCK); |
| #endif |
| |
| if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1) { |
| break; |
| } |
| #ifdef WIN32 |
| if (WSAGetLastError() == WSAEWOULDBLOCK) |
| #else |
| if (errno == EINPROGRESS) |
| #endif |
| { |
| fd_set fds; |
| FD_ZERO(&fds); |
| FD_SET(sfd, &fds); |
| |
| struct timeval timeout; |
| timeout.tv_sec = CONNECT_TIMEOUT / 1000; |
| timeout.tv_usec = (CONNECT_TIMEOUT - (timeout.tv_sec * 1000)) * 1000; |
| if (select(sfd + 1, NULL, &fds, NULL, &timeout) == 1) { |
| int so_error; |
| socklen_t len = sizeof(so_error); |
| getsockopt(sfd, SOL_SOCKET, SO_ERROR, (void*)&so_error, &len); |
| if (so_error == 0) { |
| break; |
| } |
| } |
| } |
| socket_close(sfd); |
| } |
| |
| freeaddrinfo(result); |
| |
| if (rp == NULL) { |
| if (verbose >= 2) |
| fprintf(stderr, "%s: Could not connect to %s:%d\n", __func__, addr, port); |
| return -1; |
| } |
| |
| if (setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (void*)&yes, sizeof(int)) == -1) { |
| perror("Could not set TCP_NODELAY on socket"); |
| } |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, (void*)&bufsize, sizeof(int)) == -1) { |
| perror("Could not set send buffer for socket"); |
| } |
| |
| if (setsockopt(sfd, SOL_SOCKET, SO_RCVBUF, (void*)&bufsize, sizeof(int)) == -1) { |
| perror("Could not set receive buffer for socket"); |
| } |
| |
| return sfd; |
| } |
| |
| int socket_check_fd(int fd, fd_mode fdm, unsigned int timeout) |
| { |
| fd_set fds; |
| int sret; |
| int eagain; |
| struct timeval to; |
| struct timeval *pto; |
| |
| if (fd < 0) { |
| if (verbose >= 2) |
| fprintf(stderr, "ERROR: invalid fd in check_fd %d\n", fd); |
| return -1; |
| } |
| |
| FD_ZERO(&fds); |
| FD_SET(fd, &fds); |
| |
| sret = -1; |
| |
| do { |
| if (timeout > 0) { |
| to.tv_sec = (time_t) (timeout / 1000); |
| to.tv_usec = (time_t) ((timeout - (to.tv_sec * 1000)) * 1000); |
| pto = &to; |
| } else { |
| pto = NULL; |
| } |
| eagain = 0; |
| switch (fdm) { |
| case FDM_READ: |
| sret = select(fd + 1, &fds, NULL, NULL, pto); |
| break; |
| case FDM_WRITE: |
| sret = select(fd + 1, NULL, &fds, NULL, pto); |
| break; |
| case FDM_EXCEPT: |
| sret = select(fd + 1, NULL, NULL, &fds, pto); |
| break; |
| default: |
| return -1; |
| } |
| |
| if (sret < 0) { |
| switch (errno) { |
| case EINTR: |
| // interrupt signal in select |
| if (verbose >= 2) |
| fprintf(stderr, "%s: EINTR\n", __func__); |
| eagain = 1; |
| break; |
| case EAGAIN: |
| if (verbose >= 2) |
| fprintf(stderr, "%s: EAGAIN\n", __func__); |
| break; |
| default: |
| if (verbose >= 2) |
| fprintf(stderr, "%s: select failed: %s\n", __func__, |
| strerror(errno)); |
| return -1; |
| } |
| } else if (sret == 0) { |
| if (verbose >= 2) |
| fprintf(stderr, "%s: timeout\n", __func__); |
| return -ETIMEDOUT; |
| } |
| } while (eagain); |
| |
| return sret; |
| } |
| |
| int socket_accept(int fd, uint16_t port) |
| { |
| #ifdef WIN32 |
| int addr_len; |
| #else |
| socklen_t addr_len; |
| #endif |
| int result; |
| struct sockaddr_storage addr; |
| addr_len = sizeof(addr); |
| |
| result = accept(fd, (struct sockaddr*)&addr, &addr_len); |
| |
| return result; |
| } |
| |
| int socket_shutdown(int fd, int how) |
| { |
| return shutdown(fd, how); |
| } |
| |
| int socket_close(int fd) { |
| #ifdef WIN32 |
| return closesocket(fd); |
| #else |
| return close(fd); |
| #endif |
| } |
| |
| int socket_receive(int fd, void *data, size_t length) |
| { |
| return socket_receive_timeout(fd, data, length, 0, RECV_TIMEOUT); |
| } |
| |
| int socket_peek(int fd, void *data, size_t length) |
| { |
| return socket_receive_timeout(fd, data, length, MSG_PEEK, RECV_TIMEOUT); |
| } |
| |
| int socket_receive_timeout(int fd, void *data, size_t length, int flags, |
| unsigned int timeout) |
| { |
| int res; |
| int result; |
| |
| // check if data is available |
| res = socket_check_fd(fd, FDM_READ, timeout); |
| if (res <= 0) { |
| return res; |
| } |
| // if we get here, there _is_ data available |
| result = recv(fd, data, length, flags); |
| if (res > 0 && result == 0) { |
| // but this is an error condition |
| if (verbose >= 3) |
| fprintf(stderr, "%s: fd=%d recv returned 0\n", __func__, fd); |
| return -ECONNRESET; |
| } |
| if (result < 0) { |
| return -errno; |
| } |
| return result; |
| } |
| |
| int socket_send(int fd, void *data, size_t length) |
| { |
| int flags = 0; |
| int res = socket_check_fd(fd, FDM_WRITE, SEND_TIMEOUT); |
| if (res <= 0) { |
| return res; |
| } |
| #ifdef MSG_NOSIGNAL |
| flags |= MSG_NOSIGNAL; |
| #endif |
| return send(fd, data, length, flags); |
| } |