442 lines
17 KiB
C++
442 lines
17 KiB
C++
/*=========================================================================*\
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* Socket compatibilization module for Win32
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* LuaSocket toolkit
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*
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* The penalty of calling select to avoid busy-wait is only paid when
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* the I/O call fail in the first place.
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\*=========================================================================*/
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#include <string.h>
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#include "socket.h"
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#ifdef _WIN32
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namespace NS_SLUA {
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/* WinSock doesn't have a strerror... */
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static const char *wstrerror(int err);
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/*-------------------------------------------------------------------------*\
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* Initializes module
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\*-------------------------------------------------------------------------*/
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int socket_open(void) {
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WSADATA wsaData;
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WORD wVersionRequested = MAKEWORD(2, 0);
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int err = WSAStartup(wVersionRequested, &wsaData );
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if (err != 0) return 0;
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if ((LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 0) &&
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(LOBYTE(wsaData.wVersion) != 1 || HIBYTE(wsaData.wVersion) != 1)) {
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WSACleanup();
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return 0;
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}
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Close module
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\*-------------------------------------------------------------------------*/
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int socket_close(void) {
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WSACleanup();
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Wait for readable/writable/connected socket with timeout
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\*-------------------------------------------------------------------------*/
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#define WAITFD_R 1
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#define WAITFD_W 2
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#define WAITFD_E 4
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#define WAITFD_C (WAITFD_E|WAITFD_W)
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int socket_waitfd(p_socket ps, int sw, p_timeout tm) {
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int ret;
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fd_set rfds, wfds, efds, *rp = NULL, *wp = NULL, *ep = NULL;
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struct timeval tv, *tp = NULL;
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double t;
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if (timeout_iszero(tm)) return IO_TIMEOUT; /* optimize timeout == 0 case */
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if (sw & WAITFD_R) {
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FD_ZERO(&rfds);
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FD_SET(*ps, &rfds);
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rp = &rfds;
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}
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if (sw & WAITFD_W) { FD_ZERO(&wfds); FD_SET(*ps, &wfds); wp = &wfds; }
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if (sw & WAITFD_C) { FD_ZERO(&efds); FD_SET(*ps, &efds); ep = &efds; }
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if ((t = timeout_get(tm)) >= 0.0) {
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tv.tv_sec = (int) t;
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tv.tv_usec = (int) ((t-tv.tv_sec)*1.0e6);
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tp = &tv;
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}
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ret = select(0, rp, wp, ep, tp);
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if (ret == -1) return WSAGetLastError();
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if (ret == 0) return IO_TIMEOUT;
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if (sw == WAITFD_C && FD_ISSET(*ps, &efds)) return IO_CLOSED;
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return IO_DONE;
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}
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/*-------------------------------------------------------------------------*\
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* Select with int timeout in ms
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\*-------------------------------------------------------------------------*/
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int socket_select(t_socket n, fd_set *rfds, fd_set *wfds, fd_set *efds,
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p_timeout tm) {
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struct timeval tv;
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double t = timeout_get(tm);
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tv.tv_sec = (int) t;
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tv.tv_usec = (int) ((t - tv.tv_sec) * 1.0e6);
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if (n <= 0) {
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Sleep((DWORD) (1000*t));
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return 0;
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} else return select(0, rfds, wfds, efds, t >= 0.0? &tv: NULL);
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}
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/*-------------------------------------------------------------------------*\
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* Close and inutilize socket
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\*-------------------------------------------------------------------------*/
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void socket_destroy(p_socket ps) {
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if (*ps != SOCKET_INVALID) {
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socket_setblocking(ps); /* close can take a long time on WIN32 */
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closesocket(*ps);
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*ps = SOCKET_INVALID;
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}
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}
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/*-------------------------------------------------------------------------*\
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*
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\*-------------------------------------------------------------------------*/
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void socket_shutdown(p_socket ps, int how) {
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socket_setblocking(ps);
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shutdown(*ps, how);
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socket_setnonblocking(ps);
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}
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/*-------------------------------------------------------------------------*\
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* Creates and sets up a socket
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\*-------------------------------------------------------------------------*/
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int socket_create(p_socket ps, int domain, int type, int protocol) {
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*ps = socket(domain, type, protocol);
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if (*ps != SOCKET_INVALID) return IO_DONE;
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else return WSAGetLastError();
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}
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/*-------------------------------------------------------------------------*\
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* Connects or returns error message
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\*-------------------------------------------------------------------------*/
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int socket_connect(p_socket ps, SA *addr, socklen_t len, p_timeout tm) {
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int err;
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/* don't call on closed socket */
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if (*ps == SOCKET_INVALID) return IO_CLOSED;
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/* ask system to connect */
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if (connect(*ps, addr, len) == 0) return IO_DONE;
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/* make sure the system is trying to connect */
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err = WSAGetLastError();
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if (err != WSAEWOULDBLOCK && err != WSAEINPROGRESS) return err;
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/* zero timeout case optimization */
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if (timeout_iszero(tm)) return IO_TIMEOUT;
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/* we wait until something happens */
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err = socket_waitfd(ps, WAITFD_C, tm);
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if (err == IO_CLOSED) {
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int len = sizeof(err);
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/* give windows time to set the error (yes, disgusting) */
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Sleep(10);
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/* find out why we failed */
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getsockopt(*ps, SOL_SOCKET, SO_ERROR, (char *)&err, &len);
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/* we KNOW there was an error. if 'why' is 0, we will return
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* "unknown error", but it's not really our fault */
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return err > 0? err: IO_UNKNOWN;
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} else return err;
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}
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/*-------------------------------------------------------------------------*\
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* Binds or returns error message
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\*-------------------------------------------------------------------------*/
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int socket_bind(p_socket ps, SA *addr, socklen_t len) {
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int err = IO_DONE;
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socket_setblocking(ps);
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if (bind(*ps, addr, len) < 0) err = WSAGetLastError();
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socket_setnonblocking(ps);
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return err;
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}
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/*-------------------------------------------------------------------------*\
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*
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\*-------------------------------------------------------------------------*/
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int socket_listen(p_socket ps, int backlog) {
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int err = IO_DONE;
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socket_setblocking(ps);
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if (listen(*ps, backlog) < 0) err = WSAGetLastError();
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socket_setnonblocking(ps);
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return err;
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}
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/*-------------------------------------------------------------------------*\
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* Accept with timeout
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\*-------------------------------------------------------------------------*/
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int socket_accept(p_socket ps, p_socket pa, SA *addr, socklen_t *len,
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p_timeout tm) {
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if (*ps == SOCKET_INVALID) return IO_CLOSED;
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for ( ;; ) {
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int err;
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/* try to get client socket */
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if ((*pa = accept(*ps, addr, len)) != SOCKET_INVALID) return IO_DONE;
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/* find out why we failed */
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err = WSAGetLastError();
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/* if we failed because there was no connectoin, keep trying */
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if (err != WSAEWOULDBLOCK && err != WSAECONNABORTED) return err;
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/* call select to avoid busy wait */
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if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Send with timeout
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* On windows, if you try to send 10MB, the OS will buffer EVERYTHING
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* this can take an awful lot of time and we will end up blocked.
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* Therefore, whoever calls this function should not pass a huge buffer.
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\*-------------------------------------------------------------------------*/
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int socket_send(p_socket ps, const char *data, size_t count,
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size_t *sent, p_timeout tm)
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{
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int err;
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*sent = 0;
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/* avoid making system calls on closed sockets */
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if (*ps == SOCKET_INVALID) return IO_CLOSED;
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/* loop until we send something or we give up on error */
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for ( ;; ) {
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/* try to send something */
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int put = send(*ps, data, (int) count, 0);
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/* if we sent something, we are done */
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if (put > 0) {
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*sent = put;
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return IO_DONE;
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}
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/* deal with failure */
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err = WSAGetLastError();
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/* we can only proceed if there was no serious error */
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if (err != WSAEWOULDBLOCK) return err;
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/* avoid busy wait */
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if ((err = socket_waitfd(ps, WAITFD_W, tm)) != IO_DONE) return err;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Sendto with timeout
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\*-------------------------------------------------------------------------*/
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int socket_sendto(p_socket ps, const char *data, size_t count, size_t *sent,
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SA *addr, socklen_t len, p_timeout tm)
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{
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int err;
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*sent = 0;
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if (*ps == SOCKET_INVALID) return IO_CLOSED;
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for ( ;; ) {
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int put = sendto(*ps, data, (int) count, 0, addr, len);
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if (put > 0) {
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*sent = put;
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return IO_DONE;
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}
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err = WSAGetLastError();
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if (err != WSAEWOULDBLOCK) return err;
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if ((err = socket_waitfd(ps, WAITFD_W, tm)) != IO_DONE) return err;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Receive with timeout
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\*-------------------------------------------------------------------------*/
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int socket_recv(p_socket ps, char *data, size_t count, size_t *got,
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p_timeout tm)
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{
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int err, prev = IO_DONE;
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*got = 0;
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if (*ps == SOCKET_INVALID) return IO_CLOSED;
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for ( ;; ) {
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int taken = recv(*ps, data, (int) count, 0);
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if (taken > 0) {
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*got = taken;
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return IO_DONE;
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}
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if (taken == 0) return IO_CLOSED;
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err = WSAGetLastError();
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/* On UDP, a connreset simply means the previous send failed.
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* So we try again.
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* On TCP, it means our socket is now useless, so the error passes.
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* (We will loop again, exiting because the same error will happen) */
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if (err != WSAEWOULDBLOCK) {
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if (err != WSAECONNRESET || prev == WSAECONNRESET) return err;
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prev = err;
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}
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if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Recvfrom with timeout
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\*-------------------------------------------------------------------------*/
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int socket_recvfrom(p_socket ps, char *data, size_t count, size_t *got,
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SA *addr, socklen_t *len, p_timeout tm)
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{
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int err, prev = IO_DONE;
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*got = 0;
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if (*ps == SOCKET_INVALID) return IO_CLOSED;
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for ( ;; ) {
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int taken = recvfrom(*ps, data, (int) count, 0, addr, len);
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if (taken > 0) {
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*got = taken;
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return IO_DONE;
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}
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if (taken == 0) return IO_CLOSED;
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err = WSAGetLastError();
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/* On UDP, a connreset simply means the previous send failed.
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* So we try again.
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* On TCP, it means our socket is now useless, so the error passes.
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* (We will loop again, exiting because the same error will happen) */
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if (err != WSAEWOULDBLOCK) {
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if (err != WSAECONNRESET || prev == WSAECONNRESET) return err;
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prev = err;
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}
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if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Put socket into blocking mode
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\*-------------------------------------------------------------------------*/
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void socket_setblocking(p_socket ps) {
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u_long argp = 0;
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ioctlsocket(*ps, FIONBIO, &argp);
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}
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/*-------------------------------------------------------------------------*\
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* Put socket into non-blocking mode
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\*-------------------------------------------------------------------------*/
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void socket_setnonblocking(p_socket ps) {
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u_long argp = 1;
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ioctlsocket(*ps, FIONBIO, &argp);
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}
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/*-------------------------------------------------------------------------*\
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* DNS helpers
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\*-------------------------------------------------------------------------*/
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int socket_gethostbyaddr(const char *addr, socklen_t len, struct hostent **hp) {
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*hp = gethostbyaddr(addr, len, AF_INET);
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if (*hp) return IO_DONE;
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else return WSAGetLastError();
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}
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int socket_gethostbyname(const char *addr, struct hostent **hp) {
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*hp = gethostbyname(addr);
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if (*hp) return IO_DONE;
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else return WSAGetLastError();
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}
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/*-------------------------------------------------------------------------*\
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* Error translation functions
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\*-------------------------------------------------------------------------*/
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const char *socket_hoststrerror(int err) {
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if (err <= 0) return io_strerror(err);
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switch (err) {
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case WSAHOST_NOT_FOUND: return "host not found";
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default: return wstrerror(err);
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}
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}
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const char *socket_strerror(int err) {
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if (err <= 0) return io_strerror(err);
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switch (err) {
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case WSAEADDRINUSE: return "address already in use";
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case WSAECONNREFUSED: return "connection refused";
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case WSAEISCONN: return "already connected";
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case WSAEACCES: return "permission denied";
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case WSAECONNABORTED: return "closed";
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case WSAECONNRESET: return "closed";
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case WSAETIMEDOUT: return "timeout";
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default: return wstrerror(err);
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}
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}
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const char *socket_ioerror(p_socket ps, int err) {
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(void) ps;
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return socket_strerror(err);
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}
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static const char *wstrerror(int err) {
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switch (err) {
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case WSAEINTR: return "Interrupted function call";
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case WSAEACCES: return "Permission denied";
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case WSAEFAULT: return "Bad address";
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case WSAEINVAL: return "Invalid argument";
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case WSAEMFILE: return "Too many open files";
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case WSAEWOULDBLOCK: return "Resource temporarily unavailable";
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case WSAEINPROGRESS: return "Operation now in progress";
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case WSAEALREADY: return "Operation already in progress";
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case WSAENOTSOCK: return "Socket operation on nonsocket";
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case WSAEDESTADDRREQ: return "Destination address required";
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case WSAEMSGSIZE: return "Message too long";
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case WSAEPROTOTYPE: return "Protocol wrong type for socket";
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case WSAENOPROTOOPT: return "Bad protocol option";
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case WSAEPROTONOSUPPORT: return "Protocol not supported";
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case WSAESOCKTNOSUPPORT: return "Socket type not supported";
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case WSAEOPNOTSUPP: return "Operation not supported";
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case WSAEPFNOSUPPORT: return "Protocol family not supported";
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case WSAEAFNOSUPPORT:
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return "Address family not supported by protocol family";
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case WSAEADDRINUSE: return "Address already in use";
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case WSAEADDRNOTAVAIL: return "Cannot assign requested address";
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case WSAENETDOWN: return "Network is down";
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case WSAENETUNREACH: return "Network is unreachable";
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case WSAENETRESET: return "Network dropped connection on reset";
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case WSAECONNABORTED: return "Software caused connection abort";
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case WSAECONNRESET: return "Connection reset by peer";
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case WSAENOBUFS: return "No buffer space available";
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case WSAEISCONN: return "Socket is already connected";
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case WSAENOTCONN: return "Socket is not connected";
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case WSAESHUTDOWN: return "Cannot send after socket shutdown";
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case WSAETIMEDOUT: return "Connection timed out";
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case WSAECONNREFUSED: return "Connection refused";
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case WSAEHOSTDOWN: return "Host is down";
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case WSAEHOSTUNREACH: return "No route to host";
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case WSAEPROCLIM: return "Too many processes";
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case WSASYSNOTREADY: return "Network subsystem is unavailable";
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case WSAVERNOTSUPPORTED: return "Winsock.dll version out of range";
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case WSANOTINITIALISED:
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return "Successful WSAStartup not yet performed";
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case WSAEDISCON: return "Graceful shutdown in progress";
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case WSAHOST_NOT_FOUND: return "Host not found";
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case WSATRY_AGAIN: return "Nonauthoritative host not found";
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case WSANO_RECOVERY: return "Nonrecoverable name lookup error";
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case WSANO_DATA: return "Valid name, no data record of requested type";
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default: return "Unknown error";
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}
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}
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const char *socket_gaistrerror(int err) {
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if (err == 0) return NULL;
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switch (err) {
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case EAI_AGAIN: return "temporary failure in name resolution";
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case EAI_BADFLAGS: return "invalid value for ai_flags";
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#ifdef EAI_BADHINTS
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case EAI_BADHINTS: return "invalid value for hints";
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#endif
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case EAI_FAIL: return "non-recoverable failure in name resolution";
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case EAI_FAMILY: return "ai_family not supported";
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case EAI_MEMORY: return "memory allocation failure";
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case EAI_NONAME:
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return "host or service not provided, or not known";
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#ifdef EAI_OVERFLOW
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case EAI_OVERFLOW: return "argument buffer overflow";
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#endif
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#ifdef EAI_PROTOCOL
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case EAI_PROTOCOL: return "resolved protocol is unknown";
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#endif
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case EAI_SERVICE: return "service not supported for socket type";
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case EAI_SOCKTYPE: return "ai_socktype not supported";
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#ifdef EAI_SYSTEM
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case EAI_SYSTEM: return strerror(errno);
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#endif
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default: return gai_strerrorA(err);
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}
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}
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} // end NS_SLUA
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#endif // _WIN32
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