457 lines
16 KiB
C++
457 lines
16 KiB
C++
/*=========================================================================*\
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* Socket compatibilization module for Unix
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* LuaSocket toolkit
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*
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* The code is now interrupt-safe.
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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 <signal.h>
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#include "socket.h"
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#ifndef _WIN32
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/*-------------------------------------------------------------------------*\
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* Wait for readable/writable/connected socket with timeout
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\*-------------------------------------------------------------------------*/
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#ifndef SOCKET_SELECT
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#include <sys/poll.h>
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namespace NS_SLUA {
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#define WAITFD_R POLLIN
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#define WAITFD_W POLLOUT
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#define WAITFD_C (POLLIN|POLLOUT)
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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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struct pollfd pfd;
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pfd.fd = *ps;
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pfd.events = sw;
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pfd.revents = 0;
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if (timeout_iszero(tm)) return IO_TIMEOUT; /* optimize timeout == 0 case */
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do {
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int t = (int)(timeout_getretry(tm)*1e3);
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ret = poll(&pfd, 1, t >= 0? t: -1);
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} while (ret == -1 && errno == EINTR);
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if (ret == -1) return errno;
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if (ret == 0) return IO_TIMEOUT;
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if (sw == WAITFD_C && (pfd.revents & (POLLIN|POLLERR))) return IO_CLOSED;
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return IO_DONE;
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}
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#else
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#define WAITFD_R 1
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#define WAITFD_W 2
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#define WAITFD_C (WAITFD_R|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, *rp, *wp;
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struct timeval tv, *tp;
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double t;
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if (*ps >= FD_SETSIZE) return EINVAL;
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if (timeout_iszero(tm)) return IO_TIMEOUT; /* optimize timeout == 0 case */
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do {
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/* must set bits within loop, because select may have modifed them */
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rp = wp = NULL;
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if (sw & WAITFD_R) { FD_ZERO(&rfds); FD_SET(*ps, &rfds); rp = &rfds; }
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if (sw & WAITFD_W) { FD_ZERO(&wfds); FD_SET(*ps, &wfds); wp = &wfds; }
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t = timeout_getretry(tm);
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tp = NULL;
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if (t >= 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(*ps+1, rp, wp, NULL, tp);
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} while (ret == -1 && errno == EINTR);
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if (ret == -1) return errno;
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if (ret == 0) return IO_TIMEOUT;
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if (sw == WAITFD_C && FD_ISSET(*ps, &rfds)) return IO_CLOSED;
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return IO_DONE;
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}
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#endif
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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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/* instals a handler to ignore sigpipe or it will crash us */
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signal(SIGPIPE, SIG_IGN);
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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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return 1;
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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);
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close(*ps);
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*ps = SOCKET_INVALID;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Select with timeout control
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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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int ret;
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do {
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struct timeval tv;
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double t = timeout_getretry(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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/* timeout = 0 means no wait */
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ret = select(n, rfds, wfds, efds, t >= 0.0 ? &tv: NULL);
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} while (ret < 0 && errno == EINTR);
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return ret;
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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 errno;
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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 = errno;
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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)) err = errno;
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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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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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* 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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/* avoid calling on closed sockets */
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if (*ps == SOCKET_INVALID) return IO_CLOSED;
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/* call connect until done or failed without being interrupted */
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do if (connect(*ps, addr, len) == 0) return IO_DONE;
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while ((err = errno) == EINTR);
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/* if connection failed immediately, return error code */
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if (err != EINPROGRESS && err != EAGAIN) 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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/* wait until we have the result of the connection attempt or timeout */
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err = socket_waitfd(ps, WAITFD_C, tm);
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if (err == IO_CLOSED) {
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if (recv(*ps, (char *) &err, 0, 0) == 0) return IO_DONE;
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else return errno;
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} else 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, 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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if ((*pa = accept(*ps, addr, len)) != SOCKET_INVALID) return IO_DONE;
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err = errno;
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if (err == EINTR) continue;
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if (err != EAGAIN && err != ECONNABORTED) return err;
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if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
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}
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/* can't reach here */
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return IO_UNKNOWN;
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}
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/*-------------------------------------------------------------------------*\
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* Send with timeout
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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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long put = (long) send(*ps, data, count, 0);
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/* if we sent anything, 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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err = errno;
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/* EPIPE means the connection was closed */
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if (err == EPIPE) return IO_CLOSED;
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/* we call was interrupted, just try again */
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if (err == EINTR) continue;
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/* if failed fatal reason, report error */
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if (err != EAGAIN) return err;
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/* wait until we can send something or we timeout */
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if ((err = socket_waitfd(ps, WAITFD_W, tm)) != IO_DONE) return err;
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}
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/* can't reach here */
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return IO_UNKNOWN;
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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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long put = (long) sendto(*ps, data, 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 = errno;
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if (err == EPIPE) return IO_CLOSED;
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if (err == EINTR) continue;
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if (err != EAGAIN) 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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return IO_UNKNOWN;
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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, p_timeout tm) {
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int err;
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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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long taken = (long) recv(*ps, data, 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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err = errno;
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if (taken == 0) return IO_CLOSED;
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if (err == EINTR) continue;
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if (err != EAGAIN) return err;
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if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
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}
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return IO_UNKNOWN;
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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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int err;
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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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long taken = (long) recvfrom(*ps, data, 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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err = errno;
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if (taken == 0) return IO_CLOSED;
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if (err == EINTR) continue;
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if (err != EAGAIN) return err;
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if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
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}
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return IO_UNKNOWN;
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}
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/*-------------------------------------------------------------------------*\
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* Write with timeout
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*
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* socket_read and socket_write are cut-n-paste of socket_send and socket_recv,
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* with send/recv replaced with write/read. We can't just use write/read
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* in the socket version, because behaviour when size is zero is different.
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\*-------------------------------------------------------------------------*/
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int socket_write(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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long put = (long) write(*ps, data, count);
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/* if we sent anything, 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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err = errno;
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/* EPIPE means the connection was closed */
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if (err == EPIPE) return IO_CLOSED;
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/* we call was interrupted, just try again */
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if (err == EINTR) continue;
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/* if failed fatal reason, report error */
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if (err != EAGAIN) return err;
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/* wait until we can send something or we timeout */
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if ((err = socket_waitfd(ps, WAITFD_W, tm)) != IO_DONE) return err;
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}
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/* can't reach here */
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return IO_UNKNOWN;
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}
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/*-------------------------------------------------------------------------*\
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* Read with timeout
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* See note for socket_write
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\*-------------------------------------------------------------------------*/
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int socket_read(p_socket ps, char *data, size_t count, size_t *got, p_timeout tm) {
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int err;
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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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long taken = (long) read(*ps, data, count);
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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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err = errno;
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if (taken == 0) return IO_CLOSED;
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if (err == EINTR) continue;
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if (err != EAGAIN) return err;
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if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
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}
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return IO_UNKNOWN;
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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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int flags = fcntl(*ps, F_GETFL, 0);
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flags &= (~(O_NONBLOCK));
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fcntl(*ps, F_SETFL, flags);
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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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int flags = fcntl(*ps, F_GETFL, 0);
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flags |= O_NONBLOCK;
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fcntl(*ps, F_SETFL, flags);
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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 if (h_errno) return h_errno;
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else if (errno) return errno;
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else return IO_UNKNOWN;
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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 if (h_errno) return h_errno;
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else if (errno) return errno;
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else return IO_UNKNOWN;
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}
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/*-------------------------------------------------------------------------*\
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* Error translation functions
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* Make sure important error messages are standard
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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 HOST_NOT_FOUND: return "host not found";
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default: return hstrerror(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 EADDRINUSE: return "address already in use";
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case EISCONN: return "already connected";
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case EACCES: return "permission denied";
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case ECONNREFUSED: return "connection refused";
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case ECONNABORTED: return "closed";
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case ECONNRESET: return "closed";
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case ETIMEDOUT: return "timeout";
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default: return strerror(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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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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case EAI_OVERFLOW: return "argument buffer overflow";
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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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case EAI_SYSTEM: return strerror(errno);
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default: return gai_strerror(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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