mirror of
https://github.com/tmate-io/tmate.git
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361 lines
8.3 KiB
C
361 lines
8.3 KiB
C
/* $Id: tmux.c,v 1.66 2008-06-20 18:45:35 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 <errno.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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#ifndef NO_PATHS_H
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#include <paths.h>
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#endif
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#include "tmux.h"
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#ifdef DEBUG
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#ifdef __OpenBSD__
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const char *malloc_options = "AFGJPX";
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#endif
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#ifdef __FreeBSD__
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const char *_malloc_options = "AJX";
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#endif
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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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char *cfg_file;
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struct options global_options;
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int debug_level;
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int be_quiet;
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void sighandler(int);
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__dead void usage(void);
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#ifdef NO_PROGNAME
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const char *__progname = "tmux";
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#endif
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__dead void
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usage(void)
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{
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fprintf(stderr,
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"usage: %s [-v] [-f file] [-S socket-path] [command [flags]]\n",
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__progname);
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exit(1);
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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 *client, *path, *name, *cause, *home;
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char rpath[MAXPATHLEN];
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int n, opt;
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client = path = name = NULL;
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while ((opt = getopt(argc, argv, "f:qS:Vv")) != EOF) {
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switch (opt) {
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case 'f':
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cfg_file = xstrdup(optarg);
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break;
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case 'S':
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path = xstrdup(optarg);
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break;
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case 'q':
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be_quiet = 1;
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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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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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log_open(stderr, LOG_USER, debug_level);
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siginit();
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options_init(&global_options, NULL);
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options_set_number(&global_options, "status", 1);
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options_set_colours(&global_options, "status-colour", 0x02);
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options_set_number(&global_options, "bell-action", BELL_ANY);
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options_set_number(&global_options, "history-limit", 2000);
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options_set_number(&global_options, "display-time", 750);
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options_set_key(&global_options, "prefix", META);
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options_set_string(&global_options, "status-left", "%s", ""); /* ugh */
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options_set_string(
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&global_options, "status-right", "%%H:%%M %%d-%%b-%%y");
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options_set_number(&global_options, "status-interval", 15);
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options_set_number(&global_options, "set-titles", 1);
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options_set_number(&global_options, "buffer-limit", 9);
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if (cfg_file == NULL) {
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home = getenv("HOME");
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if (home == NULL || *home == '\0') {
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pw = getpwuid(getuid());
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if (pw != NULL)
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home = pw->pw_dir;
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endpwent();
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}
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xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
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if (access(cfg_file, R_OK) != 0) {
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xfree(cfg_file);
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cfg_file = NULL;
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}
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} else {
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if (access(cfg_file, R_OK) != 0) {
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log_warn("%s", cfg_file);
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exit(1);
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}
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}
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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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if (realpath(path, rpath) == NULL) {
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if (errno != ENOENT) {
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log_warn("%s", path);
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exit(1);
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}
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/*
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* Linux appears to fill in the buffer fine but then returns
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* ENOENT if the file doesn't exist. But since it returns an
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* error, we can't rely on the buffer. Grr.
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*/
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if (strlcpy(rpath, path, sizeof rpath) >= sizeof rpath) {
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log_warnx("%s: %s", path, strerror(ENAMETOOLONG));
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exit(1);
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}
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}
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xfree(path);
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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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options_set_string(
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&global_options, "default-command", "exec %s", shell);
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if (argc == 0) {
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cmd = xmalloc(sizeof *cmd);
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cmd->entry = &cmd_new_session_entry;
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cmd->entry->init(cmd, 0);
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} else if ((cmd = cmd_parse(argc, argv, &cause)) == NULL) {
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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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client_fill_session(&data);
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if (client_init(rpath, &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(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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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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options_free(&global_options);
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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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}
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