Return to server-msg.c CVS log

Up to [local] / src / usr.bin / tmux

If the client passes zero for the window size in the identify message (which it
can, for example on serial terminals), reset it to 80x25, same as for resize
messages. Problem reported by kettenis@.

/* $OpenBSD: server-msg.c,v 1.14 2009/08/13 12:15:45 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 <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

void	server_msg_command(struct client *, struct msg_command_data *);
void	server_msg_identify(struct client *, struct msg_identify_data *, int);
void	server_msg_resize(struct client *, struct msg_resize_data *);

void printflike2 server_msg_command_error(struct cmd_ctx *, const char *, ...);
void printflike2 server_msg_command_print(struct cmd_ctx *, const char *, ...);
void printflike2 server_msg_command_info(struct cmd_ctx *, const char *, ...);

int
server_msg_dispatch(struct client *c)
{
	struct imsg		 imsg;
	struct msg_command_data	 commanddata;
	struct msg_identify_data identifydata;
	struct msg_resize_data	 resizedata;
	struct msg_unlock_data	 unlockdata;
	struct msg_environ_data	 environdata;
	ssize_t			 n, datalen;

        if ((n = imsg_read(&c->ibuf)) == -1 || n == 0)
                return (-1);

	for (;;) {
		if ((n = imsg_get(&c->ibuf, &imsg)) == -1)
			return (-1);
		if (n == 0)
			return (0);
		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;

		if (imsg.hdr.peerid != PROTOCOL_VERSION) {
			server_write_client(c, MSG_VERSION, NULL, 0);
			c->flags |= CLIENT_BAD;
			imsg_free(&imsg);
			continue;
		}

		log_debug("got %d from client %d", imsg.hdr.type, c->ibuf.fd);
		switch (imsg.hdr.type) {
		case MSG_COMMAND:
			if (datalen != sizeof commanddata)
				fatalx("bad MSG_COMMAND size");
			memcpy(&commanddata, imsg.data, sizeof commanddata);

			server_msg_command(c, &commanddata);
			break;
		case MSG_IDENTIFY:
			if (datalen != sizeof identifydata)
				fatalx("bad MSG_IDENTIFY size");
			memcpy(&identifydata, imsg.data, sizeof identifydata);

			server_msg_identify(c, &identifydata, imsg.fd);
			break;
		case MSG_RESIZE:
			if (datalen != sizeof resizedata)
				fatalx("bad MSG_RESIZE size");
			memcpy(&resizedata, imsg.data, sizeof resizedata);

			server_msg_resize(c, &resizedata);
			break;
		case MSG_EXITING:
			if (datalen != 0)
				fatalx("bad MSG_EXITING size");

			c->session = NULL;
			tty_close(&c->tty);
			server_write_client(c, MSG_EXITED, NULL, 0);
			break;
		case MSG_UNLOCK:
			if (datalen != sizeof unlockdata)
				fatalx("bad MSG_UNLOCK size");
			memcpy(&unlockdata, imsg.data, sizeof unlockdata);

			unlockdata.pass[(sizeof unlockdata.pass) - 1] = '\0';
			if (server_unlock(unlockdata.pass) != 0)
				server_write_error(c, "bad password");
			memset(&unlockdata, 0, sizeof unlockdata);
			server_write_client(c, MSG_EXIT, NULL, 0);
			break;
		case MSG_WAKEUP:
			if (datalen != 0)
				fatalx("bad MSG_WAKEUP size");

			c->flags &= ~CLIENT_SUSPENDED;
			tty_start_tty(&c->tty);
			server_redraw_client(c);
			break;
		case MSG_ENVIRON:
			if (datalen != sizeof environdata)
				fatalx("bad MSG_ENVIRON size");
			memcpy(&environdata, imsg.data, sizeof environdata);

			environdata.var[(sizeof environdata.var) - 1] = '\0';
			if (strchr(environdata.var, '=') != NULL)
				environ_put(&c->environ, environdata.var);
			break;
		default:
			fatalx("unexpected message");
		}

		imsg_free(&imsg);
	}
}

void printflike2
server_msg_command_error(struct cmd_ctx *ctx, const char *fmt, ...)
{
	struct msg_print_data	data;
	va_list			ap;

	va_start(ap, fmt);
	xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
	va_end(ap);

	server_write_client(ctx->cmdclient, MSG_ERROR, &data, sizeof data);
}

void printflike2
server_msg_command_print(struct cmd_ctx *ctx, const char *fmt, ...)
{
	struct msg_print_data	data;
	va_list			ap;

	va_start(ap, fmt);
	xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
	va_end(ap);

	server_write_client(ctx->cmdclient, MSG_PRINT, &data, sizeof data);
}

void printflike2
server_msg_command_info(struct cmd_ctx *ctx, const char *fmt, ...)
{
	struct msg_print_data	data;
	va_list			ap;

	if (be_quiet)
		return;

	va_start(ap, fmt);
	xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
	va_end(ap);

	server_write_client(ctx->cmdclient, MSG_PRINT, &data, sizeof data);
}

void
server_msg_command(struct client *c, struct msg_command_data *data)
{
	struct cmd_ctx	 ctx;
	struct cmd_list	*cmdlist = NULL;
	struct cmd	*cmd;
	int		 argc;
	char	       **argv, *cause;

	server_activity = time(NULL);

	ctx.error = server_msg_command_error;
	ctx.print = server_msg_command_print;
	ctx.info = server_msg_command_info;

	ctx.msgdata = data;
	ctx.curclient = NULL;
	ctx.cursession = NULL;

	ctx.cmdclient = c;

	argc = data->argc;
	data->argv[(sizeof data->argv) - 1] = '\0';
	if (cmd_unpack_argv(data->argv, sizeof data->argv, argc, &argv) != 0) {
		server_msg_command_error(&ctx, "command too long");
		goto error;
	}

	if (argc == 0) {
		argc = 1;
		argv = xcalloc(1, sizeof *argv);
		*argv = xstrdup("new-session");
	}

	if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
		server_msg_command_error(&ctx, "%s", cause);
		cmd_free_argv(argc, argv);
		goto error;
	}
	cmd_free_argv(argc, argv);

	if (data->pid != -1) {
		TAILQ_FOREACH(cmd, cmdlist, qentry) {
			if (cmd->entry->flags & CMD_CANTNEST) {
				server_msg_command_error(&ctx,
				    "sessions should be nested with care. "
				    "unset $TMUX to force");
				goto error;
			}
		}
	}

	if (cmd_list_exec(cmdlist, &ctx) != 1)
		server_write_client(c, MSG_EXIT, NULL, 0);
	cmd_list_free(cmdlist);
	return;

error:
	if (cmdlist != NULL)
		cmd_list_free(cmdlist);
	server_write_client(c, MSG_EXIT, NULL, 0);
}

void
server_msg_identify(struct client *c, struct msg_identify_data *data, int fd)
{
	c->tty.sx = data->sx;
	if (c->tty.sx == 0)
		c->tty.sx = 80;
	c->tty.sy = data->sy;
	if (c->tty.sy == 0)
		c->tty.sy = 25;

	c->cwd = NULL;
	data->cwd[(sizeof data->cwd) - 1] = '\0';
	if (*data->cwd != '\0')
		c->cwd = xstrdup(data->cwd);

	data->tty[(sizeof data->tty) - 1] = '\0';
	data->term[(sizeof data->term) - 1] = '\0';
	tty_init(&c->tty, fd, data->tty, data->term);
	if (data->flags & IDENTIFY_UTF8)
		c->tty.flags |= TTY_UTF8;
	if (data->flags & IDENTIFY_256COLOURS)
		c->tty.term_flags |= TERM_256COLOURS;
	else if (data->flags & IDENTIFY_88COLOURS)
		c->tty.term_flags |= TERM_88COLOURS;
	if (data->flags & IDENTIFY_HASDEFAULTS)
		c->tty.term_flags |= TERM_HASDEFAULTS;

	c->flags |= CLIENT_TERMINAL;
}

void
server_msg_resize(struct client *c, struct msg_resize_data *data)
{
	c->tty.sx = data->sx;
	if (c->tty.sx == 0)
		c->tty.sx = 80;
	c->tty.sy = data->sy;
	if (c->tty.sy == 0)
		c->tty.sy = 25;

	c->tty.cx = UINT_MAX;
	c->tty.cy = UINT_MAX;
	c->tty.rupper = UINT_MAX;
	c->tty.rlower = UINT_MAX;

	recalculate_sizes();

	/* Always redraw this client. */
	server_redraw_client(c);
}