tmux.c - tmux - Rivoreo Source Code Repositories

 /* $OpenBSD$ */

 /*
  * 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>
 #include <getopt.h>
 #include <locale.h>
 #include <paths.h>
 #include <pwd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <unistd.h>

 #include "tmux.h"

 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,
 	    "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n"
 	    "            [-S socket-path] [command [flags]]\n",
 	    __progname);
 	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 = __progname;
 	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);
 	}
 }

 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		*path, *label, **var, tmp[PATH_MAX], *shellcmd = NULL;
 	const char	*s;
 	int		 opt, flags, keys;

 	setlocale(LC_CTYPE, "en_US.UTF-8");
 	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(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;
 		default:
 			usage();
 		}
 	}
 	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);

 	global_options = options_create(NULL);
 	options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options);

 	global_s_options = options_create(NULL);
 	options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options);
 	options_set_string(global_s_options, "default-shell", "%s", getshell());

 	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;
 		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));
 }
	/* $OpenBSD$ */

	/*
	* 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>
	#include <getopt.h>
	#include <locale.h>
	#include <paths.h>
	#include <pwd.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include <unistd.h>

	#include "tmux.h"

	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,
	"usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n"
	" [-S socket-path] [command [flags]]\n",
	__progname);
	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 = __progname;
	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);
	}
	}

	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 path, label, *var, tmp[PATH_MAX], shellcmd = NULL;
	const char *s;
	int opt, flags, keys;

	setlocale(LC_CTYPE, "en_US.UTF-8");
	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(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;
	default:
	usage();
	}
	}
	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);

	global_options = options_create(NULL);
	options_table_populate_tree(OPTIONS_TABLE_SERVER, global_options);

	global_s_options = options_create(NULL);
	options_table_populate_tree(OPTIONS_TABLE_SESSION, global_s_options);
	options_set_string(global_s_options, "default-shell", "%s", getshell());

	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;
	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));
	}