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tmate/tmux.c

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/* $Id: tmux.c,v 1.96 2009-01-14 22:13:30 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#ifndef NO_PATHS_H
#include <paths.h>
#endif
#include "tmux.h"
#ifdef DEBUG
/* DragonFly uses an OpenBSD-like malloc() since 1.6 */
#if defined(__OpenBSD__) || defined(__DragonFly__)
const char *malloc_options = "AFGJPX";
#endif
#ifdef __FreeBSD__
const char *_malloc_options = "AJX";
#endif
#endif
volatile sig_atomic_t sigwinch;
volatile sig_atomic_t sigterm;
char *cfg_file;
struct options global_options;
struct options global_window_options;
int server_locked;
char *server_password;
time_t server_activity;
int debug_level;
int be_quiet;
time_t start_time;
const char *socket_path;
void sighandler(int);
__dead void usage(void);
#ifdef NO_PROGNAME
const char *__progname = "tmux";
#endif
__dead void
usage(void)
{
fprintf(stderr, "usage: "
"%s [-2dquVv] [-f file] [-S socket-path] [command [flags]]\n",
__progname);
exit(1);
}
void
logfile(const char *name)
{
char *path;
log_close();
if (debug_level > 0) {
xasprintf(
&path, "%s-%s-%ld.log", __progname, name, (long) getpid());
log_open_file(debug_level, path);
xfree(path);
}
}
void
sighandler(int sig)
{
int saved_errno;
saved_errno = errno;
switch (sig) {
case SIGWINCH:
sigwinch = 1;
break;
case SIGTERM:
sigterm = 1;
break;
case SIGCHLD:
waitpid(WAIT_ANY, NULL, WNOHANG);
break;
}
errno = saved_errno;
}
void
siginit(void)
{
struct sigaction act;
memset(&act, 0, sizeof act);
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
act.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR1, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR2, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGINT, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTSTP, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGQUIT, &act, NULL) != 0)
fatal("sigaction failed");
act.sa_handler = sighandler;
if (sigaction(SIGWINCH, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTERM, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGCHLD, &act, NULL) != 0)
fatal("sigaction failed");
}
void
sigreset(void)
{
struct sigaction act;
memset(&act, 0, sizeof act);
sigemptyset(&act.sa_mask);
act.sa_handler = SIG_DFL;
if (sigaction(SIGPIPE, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR1, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR2, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGINT, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTSTP, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGQUIT, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGWINCH, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTERM, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGCHLD, &act, NULL) != 0)
fatal("sigaction failed");
}
int
main(int argc, char **argv)
{
struct client_ctx cctx;
struct msg_command_data cmddata;
struct buffer *b;
struct cmd *cmd;
struct pollfd pfd;
struct hdr hdr;
const char *shell;
struct passwd *pw;
char *path, *cause, *home, *pass = NULL;
char rpath[MAXPATHLEN], cwd[MAXPATHLEN];
int n, opt, flags, unlock, start_server;
unlock = flags = 0;
path = NULL;
while ((opt = getopt(argc, argv, "2df:qS:uUVv")) != -1) {
switch (opt) {
case '2':
flags |= IDENTIFY_256COLOURS;
break;
case 'f':
cfg_file = xstrdup(optarg);
break;
case 'S':
path = xstrdup(optarg);
break;
case 'q':
be_quiet = 1;
break;
case 'u':
flags |= IDENTIFY_UTF8;
break;
case 'U':
unlock = 1;
break;
case 'd':
flags |= IDENTIFY_HASDEFAULTS;
break;
case 'v':
debug_level++;
break;
case 'V':
printf("%s " BUILD "\n", __progname);
exit(0);
default:
usage();
}
}
argc -= optind;
argv += optind;
log_open_tty(debug_level);
siginit();
options_init(&global_options, NULL);
options_set_number(&global_options, "bell-action", BELL_ANY);
options_set_number(&global_options, "buffer-limit", 9);
options_set_number(&global_options, "display-time", 750);
options_set_number(&global_options, "history-limit", 2000);
options_set_number(&global_options, "message-bg", 3);
options_set_number(&global_options, "message-fg", 0);
options_set_number(&global_options, "prefix", META);
options_set_number(&global_options, "repeat-time", 500);
options_set_number(&global_options, "set-titles", 1);
options_set_number(&global_options, "lock-after-time", 0);
options_set_number(&global_options, "status", 1);
options_set_number(&global_options, "status-bg", 2);
options_set_number(&global_options, "status-fg", 0);
options_set_number(&global_options, "status-interval", 15);
options_set_number(&global_options, "status-left-length", 10);
options_set_number(&global_options, "status-right-length", 40);
options_set_string(&global_options, "status-left", "%s", ""); /* ugh */
options_set_string(
&global_options, "status-right", "\"#24T\" %%H:%%M %%d-%%b-%%y");
options_init(&global_window_options, NULL);
options_set_number(&global_window_options, "aggressive-resize", 0);
options_set_number(&global_window_options, "clock-mode-colour", 4);
options_set_number(&global_window_options, "clock-mode-style", 1);
options_set_number(&global_window_options, "force-height", 0);
options_set_number(&global_window_options, "force-width", 0);
options_set_number(&global_window_options, "mode-bg", 3);
options_set_number(&global_window_options, "mode-fg", 0);
options_set_number(&global_window_options, "mode-keys", MODEKEY_EMACS);
options_set_number(&global_window_options, "monitor-activity", 0);
options_set_number(&global_window_options, "utf8", 0);
options_set_number(&global_window_options, "xterm-keys", 0);
options_set_number(&global_window_options, "remain-on-exit", 0);
if (cfg_file == NULL) {
home = getenv("HOME");
if (home == NULL || *home == '\0') {
pw = getpwuid(getuid());
if (pw != NULL)
home = pw->pw_dir;
endpwent();
}
xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
if (access(cfg_file, R_OK) != 0) {
xfree(cfg_file);
cfg_file = NULL;
}
} else {
if (access(cfg_file, R_OK) != 0) {
log_warn("%s", cfg_file);
exit(1);
}
}
if (path == NULL) {
xasprintf(&path,
"%s/%s-%lu", _PATH_TMP, __progname, (u_long) getuid());
}
if (realpath(path, rpath) == NULL) {
if (errno != ENOENT) {
log_warn("%s", path);
exit(1);
}
/*
* Linux appears to fill in the buffer fine but then returns
* ENOENT if the file doesn't exist. But since it returns an
* error, we can't rely on the buffer. Grr.
*/
if (strlcpy(rpath, path, sizeof rpath) >= sizeof rpath) {
log_warnx("%s: %s", path, strerror(ENAMETOOLONG));
exit(1);
}
}
xfree(path);
shell = getenv("SHELL");
if (shell == NULL || *shell == '\0') {
pw = getpwuid(getuid());
if (pw != NULL)
shell = pw->pw_shell;
endpwent();
if (shell == NULL || *shell == '\0')
shell = _PATH_BSHELL;
}
options_set_string(
&global_options, "default-command", "exec %s", shell);
if (getcwd(cwd, sizeof cwd) == NULL) {
log_warn("getcwd");
exit(1);
}
options_set_string(&global_options, "default-path", "%s", cwd);
if (unlock) {
if (argc != 0) {
log_warnx("can't specify a command when unlocking");
exit(1);
}
cmd = NULL;
if ((pass = getpass("Password: ")) == NULL)
exit(1);
start_server = 0;
} else {
if (argc == 0) {
cmd = xmalloc(sizeof *cmd);
cmd->entry = &cmd_new_session_entry;
cmd->entry->init(cmd, 0);
} else if ((cmd = cmd_parse(argc, argv, &cause)) == NULL) {
log_warnx("%s", cause);
exit(1);
}
start_server = cmd->entry->flags & CMD_STARTSERVER;
}
memset(&cctx, 0, sizeof cctx);
if (client_init(rpath, &cctx, start_server, flags) != 0)
exit(1);
b = buffer_create(BUFSIZ);
if (unlock) {
cmd_send_string(b, pass);
client_write_server(
&cctx, MSG_UNLOCK, BUFFER_OUT(b), BUFFER_USED(b));
} else {
cmd_send(cmd, b);
cmd_free(cmd);
client_fill_session(&cmddata);
client_write_server2(&cctx, MSG_COMMAND,
&cmddata, sizeof cmddata, BUFFER_OUT(b), BUFFER_USED(b));
}
buffer_destroy(b);
for (;;) {
pfd.fd = cctx.srv_fd;
pfd.events = POLLIN;
if (BUFFER_USED(cctx.srv_out) > 0)
pfd.events |= POLLOUT;
if (poll(&pfd, 1, INFTIM) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (buffer_poll(&pfd, cctx.srv_in, cctx.srv_out) != 0)
fatalx("lost server");
restart:
if (BUFFER_USED(cctx.srv_in) < sizeof hdr)
continue;
memcpy(&hdr, BUFFER_OUT(cctx.srv_in), sizeof hdr);
if (BUFFER_USED(cctx.srv_in) < (sizeof hdr) + hdr.size)
continue;
buffer_remove(cctx.srv_in, sizeof hdr);
switch (hdr.type) {
case MSG_EXIT:
n = 0;
goto out;
case MSG_PRINT:
if (hdr.size > INT_MAX - 1)
fatalx("bad MSG_PRINT size");
log_info("%.*s",
(int) hdr.size, BUFFER_OUT(cctx.srv_in));
if (hdr.size != 0)
buffer_remove(cctx.srv_in, hdr.size);
goto restart;
case MSG_ERROR:
if (hdr.size > INT_MAX - 1)
fatalx("bad MSG_ERROR size");
log_warnx("%.*s",
(int) hdr.size, BUFFER_OUT(cctx.srv_in));
if (hdr.size != 0)
buffer_remove(cctx.srv_in, hdr.size);
n = 1;
goto out;
case MSG_READY:
n = client_main(&cctx);
goto out;
default:
fatalx("unexpected command");
}
}
out:
options_free(&global_options);
options_free(&global_window_options);
close(cctx.srv_fd);
buffer_destroy(cctx.srv_in);
buffer_destroy(cctx.srv_out);
#ifdef DEBUG
xmalloc_report(getpid(), "client");
#endif
return (n);
}
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