tmux/tmux.c
deraadt 3034a71488 Let's see if anyone screams about not being able to specify $TMPDIR
for their tmux sockets.

(Over the years, I have seen $TMPDIR set up worse than /tmp many times,
and don't know how this practice infected other parts of the system.
Nothing uses tmpdir(3), nor a huge-temporary-file program like sort.)
ok nicm
2015-10-25 07:48:16 +00:00

356 lines
7.7 KiB
C

/* $OpenBSD$ */
/*
* 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 <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <getopt.h>
#include <locale.h>
#include <paths.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
#ifdef DEBUG
extern char *malloc_options;
#endif
struct options global_options; /* server options */
struct options global_s_options; /* session options */
struct options global_w_options; /* window options */
struct environ global_environ;
char *shell_cmd;
int debug_level;
time_t start_time;
char socket_path[PATH_MAX];
__dead void usage(void);
char *makesocketpath(const char *);
__dead void
usage(void)
{
fprintf(stderr,
"usage: %s [-2Cluv] [-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;
if (debug_level > 0) {
xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
log_open(path);
free(path);
}
}
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 = __progname;
if (*progname == '-')
progname++;
if (strcmp(ptr, progname) == 0)
return (1);
return (0);
}
char *
makesocketpath(const char *label)
{
char base[PATH_MAX], realbase[PATH_MAX], *path, *s;
struct stat sb;
u_int uid;
uid = getuid();
if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid);
else
xsnprintf(base, sizeof base, "%s/tmux-%u", _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_IRWXO) != 0) {
errno = EACCES;
return (NULL);
}
if (realpath(base, realbase) == NULL)
strlcpy(realbase, base, sizeof realbase);
xasprintf(&path, "%s/%s", realbase, label);
return (path);
}
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);
}
}
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;
}
return (home);
}
int
main(int argc, char **argv)
{
char *s, *path, *label, **var, tmp[PATH_MAX];
int opt, flags, keys;
#ifdef DEBUG
malloc_options = (char *) "AFGJPX";
#endif
setlocale(LC_TIME, "");
tzset();
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(shell_cmd);
shell_cmd = 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':
debug_level++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (shell_cmd != NULL && argc != 0)
usage();
if (pledge("stdio rpath wpath cpath flock fattr unix sendfd recvfd "
"proc exec tty ps", NULL) != 0)
err(1, "pledge");
if (!(flags & CLIENT_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 || *s == '\0') {
if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0')
s = getenv("LANG");
}
if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
strcasestr(s, "UTF8") != NULL))
flags |= CLIENT_UTF8;
}
environ_init(&global_environ);
for (var = environ; *var != NULL; var++)
environ_put(&global_environ, *var);
if (getcwd(tmp, sizeof tmp) != NULL)
environ_set(&global_environ, "PWD", tmp);
options_init(&global_options, NULL);
options_table_populate_tree(server_options_table, &global_options);
options_init(&global_s_options, NULL);
options_table_populate_tree(session_options_table, &global_s_options);
options_set_string(&global_s_options, "default-shell", "%s",
getshell());
options_init(&global_w_options, NULL);
options_table_populate_tree(window_options_table, &global_w_options);
/* Enable UTF-8 if the first client is on UTF-8 terminal. */
if (flags & CLIENT_UTF8) {
options_set_number(&global_s_options, "status-utf8", 1);
options_set_number(&global_s_options, "mouse-utf8", 1);
options_set_number(&global_w_options, "utf8", 1);
}
/* 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;
options_set_number(&global_s_options, "status-keys", keys);
options_set_number(&global_w_options, "mode-keys", keys);
}
/*
* Figure out the socket path. If specified on the command-line with -S
* or -L, use it, otherwise try $TMUX or assume -L default.
*/
if (path == NULL) {
/* If no -L, use the environment. */
if (label == NULL) {
s = getenv("TMUX");
if (s != NULL) {
path = xstrdup(s);
path[strcspn (path, ",")] = '\0';
if (*path == '\0') {
free(path);
label = xstrdup("default");
}
} else
label = xstrdup("default");
}
/* -L or default set. */
if (label != NULL) {
if ((path = makesocketpath(label)) == NULL) {
fprintf(stderr, "can't create socket: %s\n",
strerror(errno));
exit(1);
}
}
}
free(label);
if (strlcpy(socket_path, path, sizeof socket_path) >=
sizeof socket_path) {
fprintf(stderr, "socket path too long: %s\n", path);
exit(1);
}
free(path);
/* Set process title. */
setproctitle("%s (%s)", __progname, socket_path);
/* Pass control to the client. */
exit(client_main(event_init(), argc, argv, flags));
}