mirror of
https://github.com/tmate-io/tmate.git
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317 lines
6.9 KiB
C
317 lines
6.9 KiB
C
/* $Id: tmux.c,v 1.39 2007-11-09 11:03:35 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/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <paths.h>
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#include <poll.h>
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#include <pwd.h>
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#include <signal.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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#ifdef DEBUG
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const char *malloc_options = "AFGJPX";
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#endif
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volatile sig_atomic_t sigwinch;
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volatile sig_atomic_t sigterm;
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int debug_level;
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int prefix_key = META;
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u_int status_lines;
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u_char status_colour;
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char *default_command;
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int bell_action;
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void sighandler(int);
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void
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usage(char **ptr, const char *fmt, ...)
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{
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char *msg;
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va_list ap;
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if (fmt == NULL) {
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xasprintf(ptr,
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"usage: %s [-v] [-S path] command [flags]", __progname);
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} else {
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va_start(ap, fmt);
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xvasprintf(&msg, fmt, ap);
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va_end(ap);
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xasprintf(ptr, "usage: %s [-v] [-S path] %s", __progname, msg);
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xfree(msg);
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}
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}
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void
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logfile(const char *name)
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{
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FILE *f;
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char *path;
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log_close();
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if (debug_level > 0) {
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xasprintf(
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&path, "%s-%s-%ld.log", __progname, name, (long) getpid());
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f = fopen(path, "w");
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log_open(f, LOG_DAEMON, debug_level);
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xfree(path);
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}
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}
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void
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sighandler(int sig)
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{
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int saved_errno;
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saved_errno = errno;
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switch (sig) {
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case SIGWINCH:
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sigwinch = 1;
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break;
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case SIGTERM:
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sigterm = 1;
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break;
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case SIGCHLD:
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waitpid(WAIT_ANY, NULL, WNOHANG);
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break;
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}
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errno = saved_errno;
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}
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void
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siginit(void)
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{
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struct sigaction act;
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memset(&act, 0, sizeof act);
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_RESTART;
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act.sa_handler = SIG_IGN;
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if (sigaction(SIGPIPE, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGUSR1, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGUSR2, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGINT, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGTSTP, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGQUIT, &act, NULL) != 0)
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fatal("sigaction failed");
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act.sa_handler = sighandler;
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if (sigaction(SIGWINCH, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGTERM, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGCHLD, &act, NULL) != 0)
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fatal("sigaction failed");
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}
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void
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sigreset(void)
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{
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struct sigaction act;
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memset(&act, 0, sizeof act);
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sigemptyset(&act.sa_mask);
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act.sa_handler = SIG_DFL;
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if (sigaction(SIGPIPE, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGUSR1, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGUSR2, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGINT, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGTSTP, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGQUIT, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGWINCH, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGTERM, &act, NULL) != 0)
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fatal("sigaction failed");
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if (sigaction(SIGCHLD, &act, NULL) != 0)
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fatal("sigaction failed");
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}
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int
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main(int argc, char **argv)
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{
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struct client_ctx cctx;
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struct msg_command_data data;
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struct buffer *b;
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struct cmd *cmd;
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struct pollfd pfd;
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struct hdr hdr;
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const char *shell;
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struct passwd *pw;
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char *path, *cause, *name;
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int n, opt;
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path = name = NULL;
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while ((opt = getopt(argc, argv, "S:s:vV")) != EOF) {
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switch (opt) {
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case 'S':
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path = xstrdup(optarg);
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break;
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case 's':
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name = xstrdup(optarg);
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break;
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case 'v':
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debug_level++;
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break;
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case 'V':
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printf("%s " BUILD "\n", __progname);
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exit(0);
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default:
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goto usage;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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goto usage;
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log_open(stderr, LOG_USER, debug_level);
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siginit();
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status_lines = 1;
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status_colour = 0x02;
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bell_action = BELL_ANY;
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shell = getenv("SHELL");
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if (shell == NULL || *shell == '\0') {
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pw = getpwuid(getuid());
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if (pw != NULL)
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shell = pw->pw_shell;
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endpwent();
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if (shell == NULL || *shell == '\0')
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shell = _PATH_BSHELL;
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}
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xasprintf(&default_command, "exec %s", shell);
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if ((cmd = cmd_parse(argc, argv, &cause)) == NULL) {
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if (cause == NULL)
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goto usage;
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log_warnx("%s", cause);
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exit(1);
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}
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memset(&cctx, 0, sizeof cctx);
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if (!(cmd->entry->flags & CMD_NOSESSION) ||
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(cmd->entry->flags & CMD_CANTNEST))
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client_fill_session(&data);
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if (client_init(path, &cctx, cmd->entry->flags & CMD_STARTSERVER) != 0)
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exit(1);
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b = buffer_create(BUFSIZ);
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cmd_send_string(b, name);
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cmd_send(cmd, b);
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cmd_free(cmd);
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client_write_server2(&cctx,
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MSG_COMMAND, &data, sizeof data, BUFFER_OUT(b), BUFFER_USED(b));
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buffer_destroy(b);
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if (path != NULL)
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xfree(path);
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if (name != NULL)
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xfree(name);
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for (;;) {
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pfd.fd = cctx.srv_fd;
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pfd.events = POLLIN;
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if (BUFFER_USED(cctx.srv_out) > 0)
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pfd.events |= POLLOUT;
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if (poll(&pfd, 1, INFTIM) == -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(&pfd, cctx.srv_in, cctx.srv_out) != 0)
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fatalx("lost server");
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restart:
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if (BUFFER_USED(cctx.srv_in) < sizeof hdr)
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continue;
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memcpy(&hdr, BUFFER_OUT(cctx.srv_in), sizeof hdr);
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if (BUFFER_USED(cctx.srv_in) < (sizeof hdr) + hdr.size)
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continue;
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buffer_remove(cctx.srv_in, sizeof hdr);
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switch (hdr.type) {
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case MSG_EXIT:
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n = 0;
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goto out;
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case MSG_PRINT:
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if (hdr.size > INT_MAX - 1)
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fatalx("bad MSG_PRINT size");
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log_info("%.*s",
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(int) hdr.size, BUFFER_OUT(cctx.srv_in));
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buffer_remove(cctx.srv_in, hdr.size);
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goto restart;
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case MSG_ERROR:
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if (hdr.size > INT_MAX - 1)
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fatalx("bad MSG_ERROR size");
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log_warnx("%.*s",
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(int) hdr.size, BUFFER_OUT(cctx.srv_in));
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buffer_remove(cctx.srv_in, hdr.size);
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n = 1;
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goto out;
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case MSG_READY:
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n = client_main(&cctx);
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goto out;
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default:
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fatalx("unexpected command");
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}
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}
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out:
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xfree(default_command);
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close(cctx.srv_fd);
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buffer_destroy(cctx.srv_in);
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buffer_destroy(cctx.srv_out);
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#ifdef DEBUG
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xmalloc_report(getpid(), "client");
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#endif
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return (n);
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usage:
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usage(&cause, NULL);
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fprintf(stderr, "%s\n", cause);
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exit(1);
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}
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