mirror of
https://github.com/tmate-io/tmate.git
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254 lines
5.5 KiB
C
254 lines
5.5 KiB
C
/* $Id: client.c,v 1.14 2007-10-05 14:23:28 nicm Exp $ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "tmux.h"
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void client_handle_winch(struct client_ctx *);
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int client_process_local(struct client_ctx *, char **);
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int
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client_init(char *path, struct client_ctx *cctx, int start_server)
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{
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struct sockaddr_un sa;
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struct stat sb;
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struct msg_identify_data data;
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struct winsize ws;
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size_t sz;
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int mode;
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u_int retries;
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if (path == NULL) {
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xasprintf(&path,
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"%s/%s-%lu", _PATH_TMP, __progname, (u_long) getuid());
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}
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retries = 0;
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retry:
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if (stat(path, &sb) != 0) {
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if (start_server && errno == ENOENT && retries < 10) {
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if (server_start(path) != 0)
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return (-1);
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usleep(10000);
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retries++;
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goto retry;
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}
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log_warn("%s: stat", path);
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return (-1);
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}
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if (!S_ISSOCK(sb.st_mode)) {
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log_warnx("%s: %s", path, strerror(ENOTSOCK));
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return (-1);
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}
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memset(&sa, 0, sizeof sa);
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sa.sun_family = AF_UNIX;
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sz = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
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if (sz >= sizeof sa.sun_path) {
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log_warnx("%s: %s", path, strerror(ENAMETOOLONG));
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return (-1);
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}
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if ((cctx->srv_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
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log_warn("%s: socket", path);
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return (-1);
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}
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if (connect(
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cctx->srv_fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
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if (start_server && errno == ECONNREFUSED && retries < 10) {
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if (unlink(path) != 0) {
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log_warn("%s: unlink", path);
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return (-1);
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}
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usleep(10000);
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retries++;
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goto retry;
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}
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log_warn("%s: connect", path);
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return (-1);
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}
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if ((mode = fcntl(cctx->srv_fd, F_GETFL)) == -1) {
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log_warn("%s: fcntl", path);
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return (-1);
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}
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if (fcntl(cctx->srv_fd, F_SETFL, mode|O_NONBLOCK) == -1) {
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log_warn("%s: fcntl", path);
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return (-1);
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}
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cctx->srv_in = buffer_create(BUFSIZ);
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cctx->srv_out = buffer_create(BUFSIZ);
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if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
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if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) {
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log_warn("ioctl(TIOCGWINSZ)");
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return (-1);
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}
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data.sx = ws.ws_col;
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data.sy = ws.ws_row;
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client_write_server(cctx, MSG_IDENTIFY, &data, sizeof data);
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}
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return (0);
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}
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int
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client_main(struct client_ctx *cctx)
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{
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struct pollfd pfds[2];
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char *error;
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int timeout;
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logfile("client");
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setproctitle("client");
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siginit();
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if ((cctx->loc_fd = local_init(&cctx->loc_in, &cctx->loc_out)) == -1)
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return (1);
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error = NULL;
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timeout = INFTIM;
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while (!sigterm) {
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if (sigwinch)
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client_handle_winch(cctx);
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pfds[0].fd = cctx->srv_fd;
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pfds[0].events = POLLIN;
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if (BUFFER_USED(cctx->srv_out) > 0)
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pfds[0].events |= POLLOUT;
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pfds[1].fd = cctx->loc_fd;
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pfds[1].events = POLLIN;
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if (BUFFER_USED(cctx->loc_out) > 0)
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pfds[1].events |= POLLOUT;
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if (poll(pfds, 2, timeout) == -1) {
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if (errno == EAGAIN || errno == EINTR)
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continue;
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fatal("poll failed");
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}
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if (buffer_poll(&pfds[0], cctx->srv_in, cctx->srv_out) != 0)
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goto server_dead;
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if (buffer_poll(&pfds[1], cctx->loc_in, cctx->loc_out) != 0)
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goto local_dead;
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if (cctx->flags & CCTX_PAUSE) {
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usleep(750000);
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cctx->flags = 0;
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}
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if (client_process_local(cctx, &error) == -1)
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goto out;
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switch (client_msg_dispatch(cctx, &error)) {
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case -1:
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goto out;
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case 0:
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/* May be more in buffer, don't let poll block. */
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timeout = 0;
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break;
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default:
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/* Out of data, poll may block. */
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timeout = INFTIM;
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break;
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}
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}
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out:
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local_done();
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if (sigterm) {
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printf("[terminated]\n");
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return (1);
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}
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if (cctx->flags & CCTX_EXIT) {
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printf("[exited]\n");
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return (0);
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}
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if (cctx->flags & CCTX_DETACH) {
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printf("[detached]\n");
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return (0);
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}
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printf("[error: %s]\n", error);
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return (1);
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server_dead:
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local_done();
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printf("[lost server]\n");
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return (1);
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local_dead:
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/* Can't do much here. Log and die. */
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fatalx("local socket dead");
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}
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void
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client_handle_winch(struct client_ctx *cctx)
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{
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struct msg_resize_data data;
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struct winsize ws;
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if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
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fatal("ioctl failed");
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data.sx = ws.ws_col;
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data.sy = ws.ws_row;
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client_write_server(cctx, MSG_RESIZE, &data, sizeof data);
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sigwinch = 0;
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}
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int
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client_process_local(struct client_ctx *cctx, unused char **error)
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{
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struct buffer *b;
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int key;
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b = buffer_create(BUFSIZ);
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while ((key = local_key()) != KEYC_NONE)
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input_store16(b, (uint16_t) key);
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log_debug("transmitting %zu bytes of input", BUFFER_USED(b));
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if (BUFFER_USED(b) != 0) {
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client_write_server(
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cctx, MSG_KEYS, BUFFER_OUT(b), BUFFER_USED(b));
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}
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buffer_destroy(b);
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return (0);
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}
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