359 lines
12 KiB
C
359 lines
12 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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* RCS ID: $Id$
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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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/*-------------------------------------------------------------------------*\
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* Wait for readable/writable/connected socket with timeout
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\*-------------------------------------------------------------------------*/
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#ifdef SOCK_POLL
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#include <sys/poll.h>
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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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static int sock_waitfd(int fd, int sw, p_tm tm) {
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int ret;
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struct pollfd pfd;
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pfd.fd = fd;
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pfd.events = sw;
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pfd.revents = 0;
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if (tm_iszero(tm)) return IO_TIMEOUT; /* optimize timeout == 0 case */
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do ret = poll(&pfd, 1, (int)(tm_getretry(tm)*1e3));
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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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static int sock_waitfd(int fd, int sw, p_tm 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 (tm_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(fd, &rfds); rp = &rfds; }
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if (sw & WAITFD_W) { FD_ZERO(&wfds); FD_SET(fd, &wfds); wp = &wfds; }
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t = tm_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(fd+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(fd, &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 sock_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 sock_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 sock_destroy(p_sock ps) {
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if (*ps != SOCK_INVALID) {
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sock_setblocking(ps);
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close(*ps);
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*ps = SOCK_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 sock_select(int n, fd_set *rfds, fd_set *wfds, fd_set *efds, p_tm 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 = tm_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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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 sock_create(p_sock ps, int domain, int type, int protocol) {
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*ps = socket(domain, type, protocol);
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if (*ps != SOCK_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 sock_bind(p_sock ps, SA *addr, socklen_t len) {
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int err = IO_DONE;
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sock_setblocking(ps);
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if (bind(*ps, addr, len) < 0) err = errno;
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sock_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 sock_listen(p_sock ps, int backlog) {
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int err = IO_DONE;
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sock_setblocking(ps);
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if (listen(*ps, backlog)) err = errno;
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sock_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 sock_shutdown(p_sock ps, int how) {
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sock_setblocking(ps);
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shutdown(*ps, how);
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sock_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 sock_connect(p_sock ps, SA *addr, socklen_t len, p_tm tm) {
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int err;
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/* avoid calling on closed sockets */
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if (*ps == SOCK_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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/* wait until we have the result of the connection attempt or timeout */
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if ((err = sock_waitfd(*ps, WAITFD_C, tm)) == IO_CLOSED) {
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/* finaly find out if we succeeded connecting */
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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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/* timed out or some weirder error */
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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 sock_accept(p_sock ps, p_sock pa, SA *addr, socklen_t *len, p_tm tm) {
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SA daddr;
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socklen_t dlen = sizeof(daddr);
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if (*ps == SOCK_INVALID) return IO_CLOSED;
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if (!addr) addr = &daddr;
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if (!len) len = &dlen;
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for ( ;; ) {
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int err;
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if ((*pa = accept(*ps, addr, len)) != SOCK_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 = sock_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 sock_send(p_sock ps, const char *data, size_t count, size_t *sent, p_tm tm)
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{
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int err;
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/* avoid making system calls on closed sockets */
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if (*ps == SOCK_INVALID) return IO_CLOSED;
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/* loop until we send something or we give up on error */
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*sent = 0;
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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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/* send can't really return 0, but EPIPE means the connection was
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closed */
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if (put == 0 || 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 = sock_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 sock_sendto(p_sock ps, const char *data, size_t count, size_t *sent,
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SA *addr, socklen_t len, p_tm tm)
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{
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int err;
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if (*ps == SOCK_INVALID) return IO_CLOSED;
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*sent = 0;
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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 (put == 0 || 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 = sock_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 sock_recv(p_sock ps, char *data, size_t count, size_t *got, p_tm tm) {
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int err;
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if (*ps == SOCK_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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*got = 0;
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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 = sock_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 sock_recvfrom(p_sock ps, char *data, size_t count, size_t *got,
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SA *addr, socklen_t *len, p_tm tm) {
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int err;
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if (*ps == SOCK_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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*got = 0;
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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 = sock_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 sock_setblocking(p_sock 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 sock_setnonblocking(p_sock 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 sock_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 h_errno;
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}
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int sock_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 h_errno;
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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 *sock_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 *sock_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 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 "timedout";
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default: return strerror(errno);
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}
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}
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const char *sock_ioerror(p_sock ps, int err) {
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(void) ps;
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return sock_strerror(err);
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}
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