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tmate/tmux.c
Tiago Cunha 9ac062acef Sync OpenBSD patchset 367: 
Add a simple synchronize-panes window option: when set, all input to any pane
that is part of the window is also sent to all other panes in the same
window. Suggested by several, most recently Tomasz Pajor.
2009-10-09 13:07:04 +00:00

660 lines
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/* $Id: tmux.c,v 1.176 2009-10-09 13:07:04 tcunha 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/stat.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#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;
volatile sig_atomic_t sigcont;
volatile sig_atomic_t sigchld;
volatile sig_atomic_t sigusr1;
volatile sig_atomic_t sigusr2;
char *cfg_file;
struct options global_s_options; /* session options */
struct options global_w_options; /* window options */
struct environ global_environ;
time_t server_activity;
int debug_level;
int be_quiet;
time_t start_time;
char *socket_path;
int login_shell;
__dead void usage(void);
char *makesockpath(const char *);
int prepare_cmd(enum msgtype *, void **, size_t *, int, char **);
int dispatch_imsg(struct client_ctx *, const char *, int *);
__dead void shell_exec(const char *, const char *);
#ifndef HAVE_PROGNAME
char *__progname = (char *) "tmux";
#endif
__dead void
usage(void)
{
fprintf(stderr,
"usage: %s [-28dlquv] [-c shell-command] [-f file] [-L socket-name]\n"
" [-S socket-path] [command [flags]]\n",
__progname);
exit(1);
}
void
logfile(const char *name)
{
char *path;
log_close();
if (debug_level > 0) {
xasprintf(&path, "tmux-%s-%ld.log", 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:
sigchld = 1;
break;
case SIGCONT:
sigcont = 1;
break;
case SIGUSR1:
sigusr1 = 1;
break;
case SIGUSR2:
sigusr2 = 1;
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(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");
if (sigaction(SIGUSR1, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR2, &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");
}
const char *
getshell(void)
{
struct passwd *pw;
const char *shell;
shell = getenv("SHELL");
if (checkshell(shell))
return (shell);
pw = getpwuid(getuid());
if (pw != NULL && checkshell(pw->pw_shell))
return (pw->pw_shell);
return (_PATH_BSHELL);
}
int
checkshell(const char *shell)
{
if (shell == NULL || *shell == '\0' || areshell(shell))
return (0);
if (access(shell, X_OK) != 0)
return (0);
return (1);
}
int
areshell(const char *shell)
{
const char *progname, *ptr;
if ((ptr = strrchr(shell, '/')) != NULL)
ptr++;
else
ptr = shell;
progname = __progname;
if (*progname == '-')
progname++;
if (strcmp(ptr, progname) == 0)
return (1);
return (0);
}
char *
makesockpath(const char *label)
{
char base[MAXPATHLEN], *path;
struct stat sb;
u_int uid;
uid = getuid();
xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid);
if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
return (NULL);
if (lstat(base, &sb) != 0)
return (NULL);
if (!S_ISDIR(sb.st_mode)) {
errno = ENOTDIR;
return (NULL);
}
if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
errno = EACCES;
return (NULL);
}
xasprintf(&path, "%s/%s", base, label);
return (path);
}
int
prepare_cmd(enum msgtype *msg, void **buf, size_t *len, int argc, char **argv)
{
static struct msg_command_data cmddata;
client_fill_session(&cmddata);
cmddata.argc = argc;
if (cmd_pack_argv(argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) {
log_warnx("command too long");
return (-1);
}
*buf = &cmddata;
*len = sizeof cmddata;
*msg = MSG_COMMAND;
return (0);
}
int
main(int argc, char **argv)
{
struct client_ctx cctx;
struct cmd_list *cmdlist;
struct cmd *cmd;
struct pollfd pfd;
enum msgtype msg;
struct passwd *pw;
struct options *so, *wo;
struct keylist *keylist;
char *s, *shellcmd, *path, *label, *home, *cause;
char cwd[MAXPATHLEN], **var;
void *buf;
size_t len;
int retcode, opt, flags, cmdflags = 0;
int nfds;
flags = 0;
shellcmd = label = path = NULL;
login_shell = (**argv == '-');
while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
switch (opt) {
case '2':
flags |= IDENTIFY_256COLOURS;
flags &= ~IDENTIFY_88COLOURS;
break;
case '8':
flags |= IDENTIFY_88COLOURS;
flags &= ~IDENTIFY_256COLOURS;
break;
case 'c':
if (shellcmd != NULL)
xfree(shellcmd);
shellcmd = xstrdup(optarg);
break;
case 'd':
flags |= IDENTIFY_HASDEFAULTS;
break;
case 'f':
if (cfg_file != NULL)
xfree(cfg_file);
cfg_file = xstrdup(optarg);
break;
case 'l':
login_shell = 1;
break;
case 'L':
if (label != NULL)
xfree(label);
label = xstrdup(optarg);
break;
case 'q':
be_quiet = 1;
break;
case 'S':
if (path != NULL)
xfree(path);
path = xstrdup(optarg);
break;
case 'u':
flags |= IDENTIFY_UTF8;
break;
case 'v':
debug_level++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (shellcmd != NULL && argc != 0)
usage();
log_open_tty(debug_level);
siginit();
if (!(flags & IDENTIFY_UTF8)) {
/*
* If the user has set whichever of LC_ALL, LC_CTYPE or LANG
* exist (in that order) to contain UTF-8, it is a safe
* assumption that either they are using a UTF-8 terminal, or
* if not they know that output from UTF-8-capable programs may
* be wrong.
*/
if ((s = getenv("LC_ALL")) == NULL) {
if ((s = getenv("LC_CTYPE")) == NULL)
s = getenv("LANG");
}
if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
strcasestr(s, "UTF8") != NULL))
flags |= IDENTIFY_UTF8;
}
environ_init(&global_environ);
for (var = environ; *var != NULL; var++)
environ_put(&global_environ, *var);
options_init(&global_s_options, NULL);
so = &global_s_options;
options_set_number(so, "base-index", 0);
options_set_number(so, "bell-action", BELL_ANY);
options_set_number(so, "buffer-limit", 9);
options_set_string(so, "default-command", "%s", "");
options_set_string(so, "default-shell", "%s", getshell());
options_set_string(so, "default-terminal", "screen");
options_set_number(so, "display-panes-colour", 4);
options_set_number(so, "display-panes-time", 1000);
options_set_number(so, "display-time", 750);
options_set_number(so, "history-limit", 2000);
options_set_number(so, "lock-after-time", 0);
options_set_string(so, "lock-command", "lock -np");
options_set_number(so, "message-attr", 0);
options_set_number(so, "message-bg", 3);
options_set_number(so, "message-fg", 0);
options_set_number(so, "repeat-time", 500);
options_set_number(so, "set-remain-on-exit", 0);
options_set_number(so, "set-titles", 0);
options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\"");
options_set_number(so, "status", 1);
options_set_number(so, "status-attr", 0);
options_set_number(so, "status-bg", 2);
options_set_number(so, "status-fg", 0);
options_set_number(so, "status-interval", 15);
options_set_number(so, "status-justify", 0);
options_set_number(so, "status-keys", MODEKEY_EMACS);
options_set_string(so, "status-left", "[#S]");
options_set_number(so, "status-left-attr", 0);
options_set_number(so, "status-left-bg", 8);
options_set_number(so, "status-left-fg", 8);
options_set_number(so, "status-left-length", 10);
options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y");
options_set_number(so, "status-right-attr", 0);
options_set_number(so, "status-right-bg", 8);
options_set_number(so, "status-right-fg", 8);
options_set_number(so, "status-right-length", 40);
options_set_string(so, "terminal-overrides",
"*88col*:colors=88,*256col*:colors=256");
options_set_string(so, "update-environment", "DISPLAY "
"WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION");
options_set_number(so, "visual-activity", 0);
options_set_number(so, "visual-bell", 0);
options_set_number(so, "visual-content", 0);
keylist = xmalloc(sizeof *keylist);
ARRAY_INIT(keylist);
ARRAY_ADD(keylist, '\002');
options_set_data(so, "prefix", keylist, xfree);
options_init(&global_w_options, NULL);
wo = &global_w_options;
options_set_number(wo, "aggressive-resize", 0);
options_set_number(wo, "automatic-rename", 1);
options_set_number(wo, "clock-mode-colour", 4);
options_set_number(wo, "clock-mode-style", 1);
options_set_number(wo, "force-height", 0);
options_set_number(wo, "force-width", 0);
options_set_number(wo, "main-pane-height", 24);
options_set_number(wo, "main-pane-width", 81);
options_set_number(wo, "mode-attr", 0);
options_set_number(wo, "mode-bg", 3);
options_set_number(wo, "mode-fg", 0);
options_set_number(wo, "mode-keys", MODEKEY_EMACS);
options_set_number(wo, "mode-mouse", 0);
options_set_number(wo, "monitor-activity", 0);
options_set_string(wo, "monitor-content", "%s", "");
options_set_number(wo, "window-status-attr", 0);
options_set_number(wo, "window-status-bg", 8);
options_set_number(wo, "window-status-current-attr", 0);
options_set_number(wo, "window-status-current-bg", 8);
options_set_number(wo, "window-status-current-fg", 8);
options_set_number(wo, "window-status-fg", 8);
options_set_number(wo, "xterm-keys", 0);
options_set_number(wo, "remain-on-exit", 0);
options_set_number(wo, "synchronize-panes", 0);
if (flags & IDENTIFY_UTF8) {
options_set_number(so, "status-utf8", 1);
options_set_number(wo, "utf8", 1);
} else {
options_set_number(so, "status-utf8", 0);
options_set_number(wo, "utf8", 0);
}
if (getcwd(cwd, sizeof cwd) == NULL) {
pw = getpwuid(getuid());
if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
strlcpy(cwd, pw->pw_dir, sizeof cwd);
else
strlcpy(cwd, "/", sizeof cwd);
}
options_set_string(so, "default-path", "%s", cwd);
if (cfg_file == NULL) {
home = getenv("HOME");
if (home == NULL || *home == '\0') {
pw = getpwuid(getuid());
if (pw != NULL)
home = pw->pw_dir;
}
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 (label == NULL)
label = xstrdup("default");
if (path == NULL && (path = makesockpath(label)) == NULL) {
log_warn("can't create socket");
exit(1);
}
xfree(label);
if (shellcmd != NULL) {
msg = MSG_SHELL;
buf = NULL;
len = 0;
} else if (prepare_cmd(&msg, &buf, &len, argc, argv) != 0)
exit(1);
if (shellcmd != NULL)
cmdflags |= CMD_STARTSERVER;
else if (argc == 0) /* new-session is the default */
cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON;
else {
/*
* It sucks parsing the command string twice (in client and
* later in server) but it is necessary to get the start server
* flag.
*/
if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
log_warnx("%s", cause);
exit(1);
}
cmdflags &= ~CMD_STARTSERVER;
TAILQ_FOREACH(cmd, cmdlist, qentry) {
if (cmd->entry->flags & CMD_STARTSERVER)
cmdflags |= CMD_STARTSERVER;
if (cmd->entry->flags & CMD_SENDENVIRON)
cmdflags |= CMD_SENDENVIRON;
}
cmd_list_free(cmdlist);
}
memset(&cctx, 0, sizeof cctx);
if (client_init(path, &cctx, cmdflags, flags) != 0)
exit(1);
xfree(path);
client_write_server(&cctx, msg, buf, len);
memset(buf, 0, len);
retcode = 0;
for (;;) {
pfd.fd = cctx.ibuf.fd;
pfd.events = POLLIN;
if (cctx.ibuf.w.queued != 0)
pfd.events |= POLLOUT;
if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (nfds == 0)
continue;
if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL))
fatalx("socket error");
if (pfd.revents & POLLIN) {
if (dispatch_imsg(&cctx, shellcmd, &retcode) != 0)
break;
}
if (pfd.revents & POLLOUT) {
if (msgbuf_write(&cctx.ibuf.w) < 0)
fatalx("msgbuf_write failed");
}
}
options_free(&global_s_options);
options_free(&global_w_options);
return (retcode);
}
int
dispatch_imsg(struct client_ctx *cctx, const char *shellcmd, int *retcode)
{
struct imsg imsg;
ssize_t n, datalen;
struct msg_print_data printdata;
struct msg_shell_data shelldata;
if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0)
fatalx("imsg_read failed");
for (;;) {
if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1)
fatalx("imsg_get failed");
if (n == 0)
return (0);
datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
switch (imsg.hdr.type) {
case MSG_EXIT:
case MSG_SHUTDOWN:
if (datalen != 0)
fatalx("bad MSG_EXIT size");
return (-1);
case MSG_ERROR:
*retcode = 1;
/* FALLTHROUGH */
case MSG_PRINT:
if (datalen != sizeof printdata)
fatalx("bad MSG_PRINT size");
memcpy(&printdata, imsg.data, sizeof printdata);
printdata.msg[(sizeof printdata.msg) - 1] = '\0';
log_info("%s", printdata.msg);
break;
case MSG_READY:
if (datalen != 0)
fatalx("bad MSG_READY size");
*retcode = client_main(cctx);
return (-1);
case MSG_VERSION:
if (datalen != 0)
fatalx("bad MSG_VERSION size");
log_warnx("protocol version mismatch (client %u, "
"server %u)", PROTOCOL_VERSION, imsg.hdr.peerid);
*retcode = 1;
return (-1);
case MSG_SHELL:
if (datalen != sizeof shelldata)
fatalx("bad MSG_SHELL size");
memcpy(&shelldata, imsg.data, sizeof shelldata);
shelldata.shell[(sizeof shelldata.shell) - 1] = '\0';
shell_exec(shelldata.shell, shellcmd);
default:
fatalx("unexpected message");
}
imsg_free(&imsg);
}
}
__dead void
shell_exec(const char *shell, const char *shellcmd)
{
const char *shellname, *ptr;
char *argv0;
sigreset();
ptr = strrchr(shell, '/');
if (ptr != NULL && *(ptr + 1) != '\0')
shellname = ptr + 1;
else
shellname = shell;
if (login_shell)
xasprintf(&argv0, "-%s", shellname);
else
xasprintf(&argv0, "%s", shellname);
setenv("SHELL", shell, 1);
execl(shell, argv0, "-c", shellcmd, (char *) NULL);
fatal("execl failed");
}
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