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Have the client pass its stdin fd to the server when identifying itself and
have the server use that rather than reopening the tty. If the fd isn't given,
use the old behaviour (so no need for a version change).

This allows tmux to be used as the shell, so also change so that when working
out the command to execute if default-command is empty (the default), tmux will
try not execute itself.

/* $OpenBSD: client.c,v 1.13 2009/08/11 21:28:11 nicm Exp $ */

/*
 * 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"

void	client_send_environ(struct client_ctx *);
void	client_handle_winch(struct client_ctx *);

int
client_init(char *path, struct client_ctx *cctx, int cmdflags, int flags)
{
	struct sockaddr_un		sa;
	struct stat			sb;
	struct msg_identify_data	data;
	struct winsize			ws;
	size_t				size;
	int				fd, mode;
	char			       *name, *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");

	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");
	imsg_init(&cctx->ibuf, fd);

	if (cmdflags & CMD_SENDENVIRON)
		client_send_environ(cctx);
	if (isatty(STDIN_FILENO)) {
		if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
			fatal("ioctl(TIOCGWINSZ)");
		data.flags = flags;
		data.sx = ws.ws_col;
		data.sy = ws.ws_row;

		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';
		}

		*data.tty = '\0';
		if ((name = ttyname(STDIN_FILENO)) == NULL)
			fatal("ttyname failed");
		if (strlcpy(data.tty, name, sizeof data.tty) >= sizeof data.tty)
			fatalx("ttyname failed");

		imsg_compose(&cctx->ibuf, MSG_IDENTIFY,
		    PROTOCOL_VERSION, -1, STDIN_FILENO, &data, sizeof data);
	}

	return (0);

start_failed:
	log_warnx("server failed to start");
	return (1);

not_found:
	log_warn("server not found");
	return (1);
}

void
client_send_environ(struct client_ctx *cctx)
{
	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(cctx, MSG_ENVIRON, &data, sizeof data);
	}
}

int
client_main(struct client_ctx *cctx)
{
	struct pollfd	 pfd;
	int		 nfds;

	siginit();

	logfile("client");

	for (;;) {
		if (sigterm)
			client_write_server(cctx, MSG_EXITING, NULL, 0);
		if (sigchld) {
			waitpid(WAIT_ANY, NULL, WNOHANG);
			sigchld = 0;
		}
		if (sigwinch)
			client_handle_winch(cctx);
		if (sigcont) {
			siginit();
			client_write_server(cctx, MSG_WAKEUP, NULL, 0);
			sigcont = 0;
		}

		pfd.fd = cctx->ibuf.fd;
		pfd.events = POLLIN;
		if (cctx->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 (client_msg_dispatch(cctx) != 0)
				break;
		}

		if (pfd.revents & POLLOUT) {
			if (msgbuf_write(&cctx->ibuf.w) < 0) {
				cctx->exittype = CCTX_DIED;
				break;
			}
		}
	}

 	if (sigterm) {
 		printf("[terminated]\n");
 		return (1);
 	}
	switch (cctx->exittype) {
	case CCTX_DIED:
		printf("[lost server]\n");
		return (0);
	case CCTX_SHUTDOWN:
		printf("[server exited]\n");
		return (0);
	case CCTX_EXIT:
		printf("[exited]\n");
		return (0);
	case CCTX_DETACH:
		printf("[detached]\n");
		return (0);
	default:
		printf("[error: %s]\n", cctx->errstr);
		return (1);
	}
}

void
client_handle_winch(struct client_ctx *cctx)
{
	struct msg_resize_data	data;
	struct winsize		ws;

	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
		fatal("ioctl failed");

	data.sx = ws.ws_col;
	data.sy = ws.ws_row;
	client_write_server(cctx, MSG_RESIZE, &data, sizeof data);

	sigwinch = 0;
}

int
client_msg_dispatch(struct client_ctx *cctx)
{
	struct imsg		 imsg;
	struct msg_print_data	 printdata;
	ssize_t			 n, datalen;

	if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) {
		cctx->exittype = CCTX_DIED;
		return (-1);
	}

	for (;;) {
		if ((n = imsg_get(&cctx->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(cctx, MSG_EXITING, NULL, 0);
			cctx->exittype = CCTX_DETACH;
			break;
		case MSG_ERROR:
			if (datalen != sizeof printdata)
				fatalx("bad MSG_ERROR size");
			memcpy(&printdata, imsg.data, sizeof printdata);

			printdata.msg[(sizeof printdata.msg) - 1] = '\0';
			cctx->errstr = xstrdup(printdata.msg);
			imsg_free(&imsg);
			return (-1);
		case MSG_EXIT:
			if (datalen != 0)
				fatalx("bad MSG_EXIT size");

			client_write_server(cctx, MSG_EXITING, NULL, 0);
			cctx->exittype = CCTX_EXIT;
			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(cctx, MSG_EXITING, NULL, 0);
			cctx->exittype = CCTX_SHUTDOWN;
			break;
		case MSG_SUSPEND:
			if (datalen != 0)
				fatalx("bad MSG_SUSPEND size");

			client_suspend();
			break;
		default:
			fatalx("unexpected message");
		}

		imsg_free(&imsg);
	}
}