client.c - tmux - Rivoreo Source Code Repositories

 /* $OpenBSD$ */

 /*
  * 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/ioctl.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/un.h>
 #include <sys/wait.h>

 #include <errno.h>
 #include <event.h>
 #include <fcntl.h>
 #include <pwd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <syslog.h>
 #include <unistd.h>

 #include "tmux.h"

 struct imsgbuf	client_ibuf;
 struct event	client_event;
 const char     *client_exitmsg;

 void		client_send_identify(int);
 void		client_send_environ(void);
 void		client_write_server(enum msgtype, void *, size_t);
 void		client_signal(int, short, void *);
 void		client_callback(int, short, void *);
 int		client_dispatch(void);

 struct imsgbuf *
 client_init(char *path, int cmdflags, int flags)
 {
 	struct sockaddr_un	sa;
 	size_t			size;
 	int			fd, mode;
 	char		      	rpathbuf[MAXPATHLEN];

 	if (realpath(path, rpathbuf) == NULL)
 		strlcpy(rpathbuf, path, sizeof rpathbuf);
 	setproctitle("client (%s)", rpathbuf);

 	memset(&sa, 0, sizeof sa);
 	sa.sun_family = AF_UNIX;
 	size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
 	if (size >= sizeof sa.sun_path) {
 		errno = ENAMETOOLONG;
 		goto not_found;
 	}

 	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
 		fatal("socket failed");

 	if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
 		if (!(cmdflags & CMD_STARTSERVER))
 			goto not_found;
 		switch (errno) {
 		case ECONNREFUSED:
 			if (unlink(path) != 0)
 				goto not_found;
 			/* FALLTHROUGH */
 		case ENOENT:
 			if ((fd = server_start(path)) == -1)
 				goto start_failed;
 			goto server_started;
 		}
 		goto not_found;
 	}

 server_started:
 	if ((mode = fcntl(fd, F_GETFL)) == -1)
 		fatal("fcntl failed");
 	if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
 		fatal("fcntl failed");
 	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
 		fatal("fcntl failed");
 	imsg_init(&client_ibuf, fd);

 	if (cmdflags & CMD_SENDENVIRON)
 		client_send_environ();
 	if (isatty(STDIN_FILENO))
 		client_send_identify(flags);

 	return (&client_ibuf);

 start_failed:
 	log_warnx("server failed to start");
 	return (NULL);

 not_found:
 	log_warn("server not found");
 	return (NULL);
 }

 void
 client_send_identify(int flags)
 {
 	struct msg_identify_data	data;
 	struct winsize			ws;
 	char			       *term;
 	int				fd;

 	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
 		fatal("ioctl(TIOCGWINSZ)");
 	data.flags = flags;

 	if (getcwd(data.cwd, sizeof data.cwd) == NULL)
 		*data.cwd = '\0';

 	term = getenv("TERM");
 	if (term == NULL ||
 	    strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
 		*data.term = '\0';

 	if ((fd = dup(STDIN_FILENO)) == -1)
 		fatal("dup failed");
 	imsg_compose(&client_ibuf,
 	    MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
 }

 void
 client_send_environ(void)
 {
 	struct msg_environ_data	data;
 	char		      **var;

  	for (var = environ; *var != NULL; var++) {
 		if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
 			continue;
 		client_write_server(MSG_ENVIRON, &data, sizeof data);
 	}
 }

 void
 client_write_server(enum msgtype type, void *buf, size_t len)
 {
  	imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
 }

 __dead void
 client_main(void)
 {
 	struct event		ev_sigcont, ev_sigterm, ev_sigwinch;
 	struct sigaction	sigact;
 	short	 		events;

 	logfile("client");

 	/* Note: event_init() has already been called. */

  	/* Set up signals. */
 	memset(&sigact, 0, sizeof sigact);
 	sigemptyset(&sigact.sa_mask);
 	sigact.sa_flags = SA_RESTART;
 	sigact.sa_handler = SIG_IGN;
 	if (sigaction(SIGINT, &sigact, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGUSR1, &sigact, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
 		fatal("sigaction failed");
 	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
 		fatal("sigaction failed");

 	signal_set(&ev_sigcont, SIGCONT, client_signal, NULL);
 	signal_add(&ev_sigcont, NULL);
 	signal_set(&ev_sigterm, SIGTERM, client_signal, NULL);
 	signal_add(&ev_sigterm, NULL);
 	signal_set(&ev_sigwinch, SIGWINCH, client_signal, NULL);
 	signal_add(&ev_sigwinch, NULL);

 	/*
 	 * imsg_read in the first client poll loop (before the terminal has
 	 * been initialised) may have read messages into the buffer after the
 	 * MSG_READY switched to here. Process anything outstanding now to
 	 * avoid hanging waiting for messages that have already arrived.
 	 */
 	if (client_dispatch() != 0)
 		goto out;

 	/* Set up the client-server socket event. */
 	events = EV_READ;
 	if (client_ibuf.w.queued > 0)
 		events |= EV_WRITE;
 	event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
 	event_add(&client_event, NULL);

 	event_dispatch();

 out:
 	/* Print the exit message, if any, and exit. */
 	if (client_exitmsg != NULL) {
 		if (!login_shell)
 			printf("[%s]\n", client_exitmsg);
 		exit(1);
 	}
 	exit(0);
 }

 void
 client_signal(int sig, short events, unused void *data)
 {
 	struct sigaction	sigact;

 	switch (sig) {
 	case SIGTERM:
 		client_exitmsg = "terminated";
 		client_write_server(MSG_EXITING, NULL, 0);
 		break;
 	case SIGWINCH:
 		client_write_server(MSG_RESIZE, NULL, 0);
 		break;
 	case SIGCONT:
 		memset(&sigact, 0, sizeof sigact);
 		sigemptyset(&sigact.sa_mask);
 		sigact.sa_flags = SA_RESTART;
 		sigact.sa_handler = SIG_IGN;
 		if (sigaction(SIGTSTP, &sigact, NULL) != 0)
 			fatal("sigaction failed");
 		client_write_server(MSG_WAKEUP, NULL, 0);
 		break;
 	}

 	event_del(&client_event);
 	events = EV_READ;
 	if (client_ibuf.w.queued > 0)
 		events |= EV_WRITE;
 	event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
 	event_add(&client_event, NULL);
 }

 void
 client_callback(unused int fd, short events, unused void *data)
 {
 	int	n;

 	if (events & EV_READ) {
 		if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
 			goto lost_server;
 		if (client_dispatch() != 0) {
 			event_loopexit(NULL);
 			return;
 		}
 	}

 	if (events & EV_WRITE) {
 		if (msgbuf_write(&client_ibuf.w) < 0)
 			goto lost_server;
 	}

 	event_del(&client_event);
 	events = EV_READ;
 	if (client_ibuf.w.queued > 0)
 		events |= EV_WRITE;
 	event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
 	event_add(&client_event, NULL);

 	return;

 lost_server:
 	client_exitmsg = "lost server";
 	event_loopexit(NULL);
 }

 int
 client_dispatch(void)
 {
 	struct imsg		imsg;
 	struct msg_lock_data	lockdata;
 	struct sigaction	sigact;
 	ssize_t			n, datalen;

 	for (;;) {
 		if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
 			fatalx("imsg_get failed");
 		if (n == 0)
 			return (0);
 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;

 		log_debug("client got %d", imsg.hdr.type);
 		switch (imsg.hdr.type) {
 		case MSG_DETACH:
 			if (datalen != 0)
 				fatalx("bad MSG_DETACH size");

 			client_write_server(MSG_EXITING, NULL, 0);
 			client_exitmsg = "detached";
 			break;
 		case MSG_EXIT:
 			if (datalen != 0)
 				fatalx("bad MSG_EXIT size");

 			client_write_server(MSG_EXITING, NULL, 0);
 			client_exitmsg = "exited";
 			break;
 		case MSG_EXITED:
 			if (datalen != 0)
 				fatalx("bad MSG_EXITED size");

 			imsg_free(&imsg);
 			return (-1);
 		case MSG_SHUTDOWN:
 			if (datalen != 0)
 				fatalx("bad MSG_SHUTDOWN size");

 			client_write_server(MSG_EXITING, NULL, 0);
 			client_exitmsg = "server exited";
 			break;
 		case MSG_SUSPEND:
 			if (datalen != 0)
 				fatalx("bad MSG_SUSPEND size");

 			memset(&sigact, 0, sizeof sigact);
 			sigemptyset(&sigact.sa_mask);
 			sigact.sa_flags = SA_RESTART;
 			sigact.sa_handler = SIG_DFL;
 			if (sigaction(SIGTSTP, &sigact, NULL) != 0)
 				fatal("sigaction failed");
 			kill(getpid(), SIGTSTP);
 			break;
 		case MSG_LOCK:
 			if (datalen != sizeof lockdata)
 				fatalx("bad MSG_LOCK size");
 			memcpy(&lockdata, imsg.data, sizeof lockdata);

 			lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
 			system(lockdata.cmd);
 			client_write_server(MSG_UNLOCK, NULL, 0);
 			break;
 		default:
 			fatalx("unexpected message");
 		}

 		imsg_free(&imsg);
 	}
 }
	/* $OpenBSD$ */

	/*
	* 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/ioctl.h>
	#include <sys/socket.h>
	#include <sys/stat.h>
	#include <sys/un.h>
	#include <sys/wait.h>

	#include <errno.h>
	#include <event.h>
	#include <fcntl.h>
	#include <pwd.h>
	#include <stdlib.h>
	#include <string.h>
	#include <syslog.h>
	#include <unistd.h>

	#include "tmux.h"

	struct imsgbuf client_ibuf;
	struct event client_event;
	const char *client_exitmsg;

	void client_send_identify(int);
	void client_send_environ(void);
	void client_write_server(enum msgtype, void *, size_t);
	void client_signal(int, short, void *);
	void client_callback(int, short, void *);
	int client_dispatch(void);

	struct imsgbuf *
	client_init(char *path, int cmdflags, int flags)
	{
	struct sockaddr_un sa;
	size_t size;
	int fd, mode;
	char rpathbuf[MAXPATHLEN];

	if (realpath(path, rpathbuf) == NULL)
	strlcpy(rpathbuf, path, sizeof rpathbuf);
	setproctitle("client (%s)", rpathbuf);

	memset(&sa, 0, sizeof sa);
	sa.sun_family = AF_UNIX;
	size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
	if (size >= sizeof sa.sun_path) {
	errno = ENAMETOOLONG;
	goto not_found;
	}

	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
	fatal("socket failed");

	if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
	if (!(cmdflags & CMD_STARTSERVER))
	goto not_found;
	switch (errno) {
	case ECONNREFUSED:
	if (unlink(path) != 0)
	goto not_found;
	/* FALLTHROUGH */
	case ENOENT:
	if ((fd = server_start(path)) == -1)
	goto start_failed;
	goto server_started;
	}
	goto not_found;
	}

	server_started:
	if ((mode = fcntl(fd, F_GETFL)) == -1)
	fatal("fcntl failed");
	if (fcntl(fd, F_SETFL, mode\|O_NONBLOCK) == -1)
	fatal("fcntl failed");
	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
	fatal("fcntl failed");
	imsg_init(&client_ibuf, fd);

	if (cmdflags & CMD_SENDENVIRON)
	client_send_environ();
	if (isatty(STDIN_FILENO))
	client_send_identify(flags);

	return (&client_ibuf);

	start_failed:
	log_warnx("server failed to start");
	return (NULL);

	not_found:
	log_warn("server not found");
	return (NULL);
	}

	void
	client_send_identify(int flags)
	{
	struct msg_identify_data data;
	struct winsize ws;
	char *term;
	int fd;

	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
	fatal("ioctl(TIOCGWINSZ)");
	data.flags = flags;

	if (getcwd(data.cwd, sizeof data.cwd) == NULL)
	*data.cwd = '\0';

	term = getenv("TERM");
	if (term == NULL \|\|
	strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
	*data.term = '\0';

	if ((fd = dup(STDIN_FILENO)) == -1)
	fatal("dup failed");
	imsg_compose(&client_ibuf,
	MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
	}

	void
	client_send_environ(void)
	{
	struct msg_environ_data data;
	char **var;

	for (var = environ; *var != NULL; var++) {
	if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
	continue;
	client_write_server(MSG_ENVIRON, &data, sizeof data);
	}
	}

	void
	client_write_server(enum msgtype type, void *buf, size_t len)
	{
	imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
	}

	__dead void
	client_main(void)
	{
	struct event ev_sigcont, ev_sigterm, ev_sigwinch;
	struct sigaction sigact;
	short events;

	logfile("client");

	/* Note: event_init() has already been called. */

	/* Set up signals. */
	memset(&sigact, 0, sizeof sigact);
	sigemptyset(&sigact.sa_mask);
	sigact.sa_flags = SA_RESTART;
	sigact.sa_handler = SIG_IGN;
	if (sigaction(SIGINT, &sigact, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGUSR1, &sigact, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
	fatal("sigaction failed");
	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
	fatal("sigaction failed");

	signal_set(&ev_sigcont, SIGCONT, client_signal, NULL);
	signal_add(&ev_sigcont, NULL);
	signal_set(&ev_sigterm, SIGTERM, client_signal, NULL);
	signal_add(&ev_sigterm, NULL);
	signal_set(&ev_sigwinch, SIGWINCH, client_signal, NULL);
	signal_add(&ev_sigwinch, NULL);

	/*
	* imsg_read in the first client poll loop (before the terminal has
	* been initialised) may have read messages into the buffer after the
	* MSG_READY switched to here. Process anything outstanding now to
	* avoid hanging waiting for messages that have already arrived.
	*/
	if (client_dispatch() != 0)
	goto out;

	/* Set up the client-server socket event. */
	events = EV_READ;
	if (client_ibuf.w.queued > 0)
	events \|= EV_WRITE;
	event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
	event_add(&client_event, NULL);

	event_dispatch();

	out:
	/* Print the exit message, if any, and exit. */
	if (client_exitmsg != NULL) {
	if (!login_shell)
	printf("[%s]\n", client_exitmsg);
	exit(1);
	}
	exit(0);
	}

	void
	client_signal(int sig, short events, unused void *data)
	{
	struct sigaction sigact;

	switch (sig) {
	case SIGTERM:
	client_exitmsg = "terminated";
	client_write_server(MSG_EXITING, NULL, 0);
	break;
	case SIGWINCH:
	client_write_server(MSG_RESIZE, NULL, 0);
	break;
	case SIGCONT:
	memset(&sigact, 0, sizeof sigact);
	sigemptyset(&sigact.sa_mask);
	sigact.sa_flags = SA_RESTART;
	sigact.sa_handler = SIG_IGN;
	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
	fatal("sigaction failed");
	client_write_server(MSG_WAKEUP, NULL, 0);
	break;
	}

	event_del(&client_event);
	events = EV_READ;
	if (client_ibuf.w.queued > 0)
	events \|= EV_WRITE;
	event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
	event_add(&client_event, NULL);
	}

	void
	client_callback(unused int fd, short events, unused void *data)
	{
	int n;

	if (events & EV_READ) {
	if ((n = imsg_read(&client_ibuf)) == -1 \|\| n == 0)
	goto lost_server;
	if (client_dispatch() != 0) {
	event_loopexit(NULL);
	return;
	}
	}

	if (events & EV_WRITE) {
	if (msgbuf_write(&client_ibuf.w) < 0)
	goto lost_server;
	}

	event_del(&client_event);
	events = EV_READ;
	if (client_ibuf.w.queued > 0)
	events \|= EV_WRITE;
	event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
	event_add(&client_event, NULL);

	return;

	lost_server:
	client_exitmsg = "lost server";
	event_loopexit(NULL);
	}

	int
	client_dispatch(void)
	{
	struct imsg imsg;
	struct msg_lock_data lockdata;
	struct sigaction sigact;
	ssize_t n, datalen;

	for (;;) {
	if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
	fatalx("imsg_get failed");
	if (n == 0)
	return (0);
	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;

	log_debug("client got %d", imsg.hdr.type);
	switch (imsg.hdr.type) {
	case MSG_DETACH:
	if (datalen != 0)
	fatalx("bad MSG_DETACH size");

	client_write_server(MSG_EXITING, NULL, 0);
	client_exitmsg = "detached";
	break;
	case MSG_EXIT:
	if (datalen != 0)
	fatalx("bad MSG_EXIT size");

	client_write_server(MSG_EXITING, NULL, 0);
	client_exitmsg = "exited";
	break;
	case MSG_EXITED:
	if (datalen != 0)
	fatalx("bad MSG_EXITED size");

	imsg_free(&imsg);
	return (-1);
	case MSG_SHUTDOWN:
	if (datalen != 0)
	fatalx("bad MSG_SHUTDOWN size");

	client_write_server(MSG_EXITING, NULL, 0);
	client_exitmsg = "server exited";
	break;
	case MSG_SUSPEND:
	if (datalen != 0)
	fatalx("bad MSG_SUSPEND size");

	memset(&sigact, 0, sizeof sigact);
	sigemptyset(&sigact.sa_mask);
	sigact.sa_flags = SA_RESTART;
	sigact.sa_handler = SIG_DFL;
	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
	fatal("sigaction failed");
	kill(getpid(), SIGTSTP);
	break;
	case MSG_LOCK:
	if (datalen != sizeof lockdata)
	fatalx("bad MSG_LOCK size");
	memcpy(&lockdata, imsg.data, sizeof lockdata);

	lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
	system(lockdata.cmd);
	client_write_server(MSG_UNLOCK, NULL, 0);
	break;
	default:
	fatalx("unexpected message");
	}

	imsg_free(&imsg);
	}
	}