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

 #include "tmux.h"

 struct imsgbuf	client_ibuf;
 const char     *client_exitmsg;

 void	client_send_environ(void);
 void	client_write_server(enum msgtype, void *, size_t);
 int	client_dispatch(void);
 void	client_suspend(void);

 struct imsgbuf *
 client_init(char *path, int cmdflags, int flags)
 {
 	struct sockaddr_un		sa;
 	struct stat			sb;
 	struct msg_identify_data	data;
 	struct winsize			ws;
 	size_t				size;
 	int				fd, fd2, mode;
 	char			       *term;
 	char		 		rpathbuf[MAXPATHLEN];

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

 	if (lstat(path, &sb) != 0) {
 		if (cmdflags & CMD_STARTSERVER && errno == ENOENT) {
 			if ((fd = server_start(path)) == -1)
 				goto start_failed;
 			goto server_started;
 		}
 		goto not_found;
 	}
 	if (!S_ISSOCK(sb.st_mode)) {
 		errno = ENOTSOCK;
 		goto not_found;
 	}

 	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 (errno == ECONNREFUSED) {
 			if (unlink(path) != 0 || !(cmdflags & CMD_STARTSERVER))
 				goto not_found;
 			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)) {
 		if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
 			fatal("ioctl(TIOCGWINSZ)");
 		data.flags = flags;

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

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

 		if ((fd2 = dup(STDIN_FILENO)) == -1)
 			fatal("dup failed");
 		imsg_compose(&client_ibuf, MSG_IDENTIFY,
 		    PROTOCOL_VERSION, -1, fd2, &data, sizeof data);
 	}

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

  	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 pollfd	 pfd;
 	int		 n, nfds;

 	siginit();

 	logfile("client");

 	/*
 	 * imsg_read in the first client poll loop (before the terminal has
 	 * been initialiased) may have read messages into the buffer after the
 	 * MSG_READY switched to here. Process anything outstanding now so poll
 	 * doesn't hang waiting for messages that have already arrived.
 	 */
 	if (client_dispatch() != 0)
 		goto out;

 	for (;;) {
 		if (sigterm) {
 			client_exitmsg = "terminated";
 			client_write_server(MSG_EXITING, NULL, 0);
 		}
 		if (sigchld) {
 			waitpid(WAIT_ANY, NULL, WNOHANG);
 			sigchld = 0;
 		}
 		if (sigwinch) {
 			client_write_server(MSG_RESIZE, NULL, 0);
  			sigwinch = 0;
 		}
 		if (sigcont) {
 			siginit();
 			client_write_server(MSG_WAKEUP, NULL, 0);
 			sigcont = 0;
 		}

 		pfd.fd = client_ibuf.fd;
 		pfd.events = POLLIN;
 		if (client_ibuf.w.queued > 0)
 			pfd.events |= POLLOUT;

 		if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
 			if (errno == EAGAIN || errno == EINTR)
 				continue;
 			fatal("poll failed");
 		}
 		if (nfds == 0)
 			continue;

 		if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL))
 			fatalx("socket error");

 		if (pfd.revents & POLLIN) {
 			if ((n = imsg_read(&client_ibuf)) == -1 || n == 0) {
 				client_exitmsg = "lost server";
 				break;
 			}
 			if (client_dispatch() != 0)
 				break;
 		}

 		if (pfd.revents & POLLOUT) {
 			if (msgbuf_write(&client_ibuf.w) < 0) {
 				client_exitmsg = "lost server";
 				break;
 			}
 		}
 	}

 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);
 }

 int
 client_dispatch(void)
 {
 	struct imsg		 imsg;
 	struct msg_lock_data	 lockdata;
 	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;

 		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");

 			client_suspend();
 			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);
 	}
 }

 void
 client_suspend(void)
 {
 	struct sigaction	 act;

 	memset(&act, 0, sizeof act);
 	sigemptyset(&act.sa_mask);
 	act.sa_flags = SA_RESTART;

 	act.sa_handler = SIG_DFL;
 	if (sigaction(SIGTSTP, &act, NULL) != 0)
 		fatal("sigaction failed");

 	act.sa_handler = sighandler;
 	if (sigaction(SIGCONT, &act, NULL) != 0)
 		fatal("sigaction failed");

 	kill(getpid(), SIGTSTP);
 }
	/* $OpenBSD$ */

	/*
	* 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 <fcntl.h>
	#include <pwd.h>
	#include <stdlib.h>
	#include <string.h>
	#include <syslog.h>
	#include <unistd.h>

	#include "tmux.h"

	struct imsgbuf client_ibuf;
	const char *client_exitmsg;

	void client_send_environ(void);
	void client_write_server(enum msgtype, void *, size_t);
	int client_dispatch(void);
	void client_suspend(void);

	struct imsgbuf *
	client_init(char *path, int cmdflags, int flags)
	{
	struct sockaddr_un sa;
	struct stat sb;
	struct msg_identify_data data;
	struct winsize ws;
	size_t size;
	int fd, fd2, mode;
	char *term;
	char rpathbuf[MAXPATHLEN];

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

	if (lstat(path, &sb) != 0) {
	if (cmdflags & CMD_STARTSERVER && errno == ENOENT) {
	if ((fd = server_start(path)) == -1)
	goto start_failed;
	goto server_started;
	}
	goto not_found;
	}
	if (!S_ISSOCK(sb.st_mode)) {
	errno = ENOTSOCK;
	goto not_found;
	}

	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 (errno == ECONNREFUSED) {
	if (unlink(path) != 0 \|\| !(cmdflags & CMD_STARTSERVER))
	goto not_found;
	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)) {
	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
	fatal("ioctl(TIOCGWINSZ)");
	data.flags = flags;

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

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

	if ((fd2 = dup(STDIN_FILENO)) == -1)
	fatal("dup failed");
	imsg_compose(&client_ibuf, MSG_IDENTIFY,
	PROTOCOL_VERSION, -1, fd2, &data, sizeof data);
	}

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

	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 pollfd pfd;
	int n, nfds;

	siginit();

	logfile("client");

	/*
	* imsg_read in the first client poll loop (before the terminal has
	* been initialiased) may have read messages into the buffer after the
	* MSG_READY switched to here. Process anything outstanding now so poll
	* doesn't hang waiting for messages that have already arrived.
	*/
	if (client_dispatch() != 0)
	goto out;

	for (;;) {
	if (sigterm) {
	client_exitmsg = "terminated";
	client_write_server(MSG_EXITING, NULL, 0);
	}
	if (sigchld) {
	waitpid(WAIT_ANY, NULL, WNOHANG);
	sigchld = 0;
	}
	if (sigwinch) {
	client_write_server(MSG_RESIZE, NULL, 0);
	sigwinch = 0;
	}
	if (sigcont) {
	siginit();
	client_write_server(MSG_WAKEUP, NULL, 0);
	sigcont = 0;
	}

	pfd.fd = client_ibuf.fd;
	pfd.events = POLLIN;
	if (client_ibuf.w.queued > 0)
	pfd.events \|= POLLOUT;

	if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
	if (errno == EAGAIN \|\| errno == EINTR)
	continue;
	fatal("poll failed");
	}
	if (nfds == 0)
	continue;

	if (pfd.revents & (POLLERR\|POLLHUP\|POLLNVAL))
	fatalx("socket error");

	if (pfd.revents & POLLIN) {
	if ((n = imsg_read(&client_ibuf)) == -1 \|\| n == 0) {
	client_exitmsg = "lost server";
	break;
	}
	if (client_dispatch() != 0)
	break;
	}

	if (pfd.revents & POLLOUT) {
	if (msgbuf_write(&client_ibuf.w) < 0) {
	client_exitmsg = "lost server";
	break;
	}
	}
	}

	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);
	}

	int
	client_dispatch(void)
	{
	struct imsg imsg;
	struct msg_lock_data lockdata;
	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;

	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");

	client_suspend();
	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);
	}
	}

	void
	client_suspend(void)
	{
	struct sigaction act;

	memset(&act, 0, sizeof act);
	sigemptyset(&act.sa_mask);
	act.sa_flags = SA_RESTART;

	act.sa_handler = SIG_DFL;
	if (sigaction(SIGTSTP, &act, NULL) != 0)
	fatal("sigaction failed");

	act.sa_handler = sighandler;
	if (sigaction(SIGCONT, &act, NULL) != 0)
	fatal("sigaction failed");

	kill(getpid(), SIGTSTP);
	}