tmux/tmux.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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 <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
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#include <getopt.h>
#include <langinfo.h>
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#include <locale.h>
#include <paths.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "tmux.h"
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struct options *global_options; /* server options */
struct options *global_s_options; /* session options */
struct options *global_w_options; /* window options */
struct environ *global_environ;
struct hooks *global_hooks;
struct timeval start_time;
const char *socket_path;
__dead void usage(void);
static char *make_label(const char *);
__dead void
usage(void)
{
fprintf(stderr,
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"usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n"
" [-S socket-path] [command [flags]]\n",
getprogname());
exit(1);
}
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' || *shell != '/')
return (0);
if (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 = getprogname();
if (*progname == '-')
progname++;
if (strcmp(ptr, progname) == 0)
return (1);
return (0);
}
static char *
make_label(const char *label)
{
char *base, resolved[PATH_MAX], *path, *s;
struct stat sb;
u_int uid;
int saved_errno;
if (label == NULL)
label = "default";
uid = getuid();
if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
xasprintf(&base, "%s/tmux-%u", s, uid);
else
xasprintf(&base, "%s/tmux-%u", _PATH_TMP, uid);
if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
goto fail;
if (lstat(base, &sb) != 0)
goto fail;
if (!S_ISDIR(sb.st_mode)) {
errno = ENOTDIR;
goto fail;
}
if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
errno = EACCES;
goto fail;
}
if (realpath(base, resolved) == NULL)
strlcpy(resolved, base, sizeof resolved);
xasprintf(&path, "%s/%s", resolved, label);
return (path);
fail:
saved_errno = errno;
free(base);
errno = saved_errno;
return (NULL);
}
void
setblocking(int fd, int state)
{
int mode;
if ((mode = fcntl(fd, F_GETFL)) != -1) {
if (!state)
mode |= O_NONBLOCK;
else
mode &= ~O_NONBLOCK;
fcntl(fd, F_SETFL, mode);
}
}
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const char *
find_home(void)
{
struct passwd *pw;
static const char *home;
if (home != NULL)
return (home);
home = getenv("HOME");
if (home == NULL || *home == '\0') {
pw = getpwuid(getuid());
if (pw != NULL)
home = pw->pw_dir;
else
home = NULL;
}
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return (home);
}
int
main(int argc, char **argv)
{
char *path, *label, **var, tmp[PATH_MAX], *shellcmd = NULL;
const char *s;
int opt, flags, keys;
if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) {
if (setlocale(LC_CTYPE, "") == NULL)
errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
s = nl_langinfo(CODESET);
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if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
}
setlocale(LC_TIME, "");
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tzset();
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if (**argv == '-')
flags = CLIENT_LOGIN;
else
flags = 0;
label = path = NULL;
while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) {
switch (opt) {
case '2':
flags |= CLIENT_256COLOURS;
break;
case 'c':
free(shellcmd);
shellcmd = xstrdup(optarg);
break;
case 'C':
if (flags & CLIENT_CONTROL)
flags |= CLIENT_CONTROLCONTROL;
else
flags |= CLIENT_CONTROL;
break;
case 'f':
set_cfg_file(optarg);
break;
case 'l':
flags |= CLIENT_LOGIN;
break;
case 'L':
free(label);
label = xstrdup(optarg);
break;
case 'q':
break;
case 'S':
free(path);
path = xstrdup(optarg);
break;
case 'u':
flags |= CLIENT_UTF8;
break;
case 'v':
log_add_level();
break;
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default:
usage();
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}
}
argc -= optind;
argv += optind;
if (shellcmd != NULL && argc != 0)
usage();
if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
"recvfd proc exec tty ps", NULL) != 0)
err(1, "pledge");
/*
* tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
* Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG 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 (getenv("TMUX") != NULL)
flags |= CLIENT_UTF8;
else {
s = getenv("LC_ALL");
if (s == NULL || *s == '\0')
s = getenv("LC_CTYPE");
if (s == NULL || *s == '\0')
s = getenv("LANG");
if (s == NULL || *s == '\0')
s = "";
if (strcasestr(s, "UTF-8") != NULL ||
strcasestr(s, "UTF8") != NULL)
flags |= CLIENT_UTF8;
}
global_hooks = hooks_create(NULL);
global_environ = environ_create();
for (var = environ; *var != NULL; var++)
environ_put(global_environ, *var);
if (getcwd(tmp, sizeof tmp) != NULL)
environ_set(global_environ, "PWD", "%s", tmp);
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global_options = options_create(NULL);
options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options);
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global_s_options = options_create(NULL);
options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options);
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options_set_string(global_s_options, "default-shell", "%s", getshell());
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global_w_options = options_create(NULL);
options_table_populate_tree(OPTIONS_TABLE_WINDOW, global_w_options);
/* Override keys to vi if VISUAL or EDITOR are set. */
if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
if (strrchr(s, '/') != NULL)
s = strrchr(s, '/') + 1;
if (strstr(s, "vi") != NULL)
keys = MODEKEY_VI;
else
keys = MODEKEY_EMACS;
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options_set_number(global_s_options, "status-keys", keys);
options_set_number(global_w_options, "mode-keys", keys);
}
/*
* If socket is specified on the command-line with -S or -L, it is
* used. Otherwise, $TMUX is checked and if that fails "default" is
* used.
*/
if (path == NULL && label == NULL) {
s = getenv("TMUX");
if (s != NULL && *s != '\0' && *s != ',') {
path = xstrdup(s);
path[strcspn (path, ",")] = '\0';
}
}
if (path == NULL && (path = make_label(label)) == NULL) {
fprintf(stderr, "can't create socket: %s\n", strerror(errno));
exit(1);
}
socket_path = path;
free(label);
/* Pass control to the client. */
exit(client_main(event_init(), argc, argv, flags, shellcmd));
}