tmux/tmux.c

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/* $OpenBSD$ */
/*
* 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 <errno.h>
#include <event.h>
#include <fcntl.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;
struct event_base *ev_base;
char *cfg_file;
char *shell_cmd;
int debug_level;
time_t start_time;
char socket_path[MAXPATHLEN];
int login_shell;
char *environ_path;
pid_t environ_pid;
u_int environ_idx;
__dead void usage(void);
void parseenvironment(void);
char *makesocketpath(const char *);
__dead void
usage(void)
{
fprintf(stderr,
"usage: %s [-28lquv] [-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);
}
}
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);
}
void
parseenvironment(void)
{
char *env, *path_pid, *pid_idx, buf[256];
size_t len;
const char *errstr;
long long ll;
environ_pid = -1;
if ((env = getenv("TMUX")) == NULL)
return;
if ((path_pid = strchr(env, ',')) == NULL || path_pid == env)
return;
if ((pid_idx = strchr(path_pid + 1, ',')) == NULL)
return;
if ((pid_idx == path_pid + 1 || pid_idx[1] == '\0'))
return;
/* path */
len = path_pid - env;
environ_path = xmalloc(len + 1);
memcpy(environ_path, env, len);
environ_path[len] = '\0';
/* pid */
len = pid_idx - path_pid - 1;
if (len > (sizeof buf) - 1)
return;
memcpy(buf, path_pid + 1, len);
buf[len] = '\0';
ll = strtonum(buf, 0, LONG_MAX, &errstr);
if (errstr != NULL)
return;
environ_pid = ll;
/* idx */
ll = strtonum(pid_idx + 1, 0, UINT_MAX, &errstr);
if (errstr != NULL)
return;
environ_idx = ll;
}
char *
makesocketpath(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);
}
__dead void
shell_exec(const char *shell, const char *shellcmd)
{
const char *shellname, *ptr;
char *argv0;
int mode;
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);
if ((mode = fcntl(STDIN_FILENO, F_GETFL)) != -1)
fcntl(STDIN_FILENO, F_SETFL, mode & ~O_NONBLOCK);
if ((mode = fcntl(STDOUT_FILENO, F_GETFL)) != -1)
fcntl(STDOUT_FILENO, F_SETFL, mode & ~O_NONBLOCK);
if ((mode = fcntl(STDERR_FILENO, F_GETFL)) != -1)
fcntl(STDERR_FILENO, F_SETFL, mode & ~O_NONBLOCK);
closefrom(STDERR_FILENO + 1);
execl(shell, argv0, "-c", shellcmd, (char *) NULL);
fatal("execl failed");
}
int
main(int argc, char **argv)
{
struct passwd *pw;
struct keylist *keylist;
char *s, *path, *label, *home, **var;
int opt, flags, quiet, keys;
#ifdef DEBUG
malloc_options = (char *) "AFGJPX";
#endif
quiet = flags = 0;
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 (shell_cmd != NULL)
xfree(shell_cmd);
shell_cmd = xstrdup(optarg);
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':
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;
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default:
usage();
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}
}
argc -= optind;
argv += optind;
if (shell_cmd != NULL && argc != 0)
usage();
log_open_tty(debug_level);
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_options, NULL);
options_table_populate_tree(server_options_table, &global_options);
options_set_number(&global_options, "quiet", quiet);
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);
/* Set the prefix option (its a list, so not in the table). */
keylist = xmalloc(sizeof *keylist);
ARRAY_INIT(keylist);
ARRAY_ADD(keylist, '\002');
options_set_data(&global_s_options, "prefix", keylist, xfree);
/* Enable UTF-8 if the first client is on UTF-8 terminal. */
if (flags & IDENTIFY_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);
}
/* Locate the configuration file. */
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 && errno == ENOENT) {
xfree(cfg_file);
cfg_file = NULL;
}
}
/*
* Figure out the socket path. If specified on the command-line with -S
* or -L, use it, otherwise try $TMUX or assume -L default.
*/
parseenvironment();
if (path == NULL) {
/* If no -L, use the environment. */
if (label == NULL) {
if (environ_path != NULL)
path = xstrdup(environ_path);
else
label = xstrdup("default");
}
/* -L or default set. */
if (label != NULL) {
if ((path = makesocketpath(label)) == NULL) {
log_warn("can't create socket");
exit(1);
}
}
}
if (label != NULL)
xfree(label);
if (realpath(path, socket_path) == NULL)
strlcpy(socket_path, path, sizeof socket_path);
xfree(path);
/* Set process title. */
setproctitle("%s (%s)", __progname, socket_path);
/* Pass control to the client. */
ev_base = event_init();
exit(client_main(argc, argv, flags));
}