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Trim some code by moving the ioctl(TIOCGWINSZ) after SIGWINCH from the client
into the server.

This is another (the second of four) protocol version changes coming this
morning, so again the server should be killed before upgrading.

/* $OpenBSD: client.c,v 1.20 2009/09/23 06:12:58 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 *);

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, 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");
	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;

		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(&cctx->ibuf, MSG_IDENTIFY,
		    PROTOCOL_VERSION, -1, fd2, &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		 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_msg_dispatch(cctx) != 0)
		goto out;

	for (;;) {
		if (sigterm)
			client_write_server(cctx, MSG_EXITING, NULL, 0);
		if (sigchld) {
			waitpid(WAIT_ANY, NULL, WNOHANG);
			sigchld = 0;
		}
		if (sigwinch) {
			client_write_server(cctx, MSG_RESIZE, NULL, 0);
 			sigwinch = 0;
		}
		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 ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) {
				cctx->exittype = CCTX_DIED;
				break;
			}
			if (client_msg_dispatch(cctx) != 0)
				break;
		}

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

out:
 	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:
		if (cctx->errstr != NULL) {
			printf("[error: %s]\n", cctx->errstr);
			return (1);
		}
		printf("[exited]\n");
		return (0);
	case CCTX_DETACH:
		printf("[detached]\n");
		return (0);
	default:
		printf("[unknown error]\n");
		return (1);
	}
}

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

	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';
			/* Error string used after exit message from server. */
			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);
	}
}