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If stdin in the client is enable immediately, tmux will eat anything
sent to stdin before it is needed, which can be inconvenient (eg pasting
commands). Instead, start with stdin disabled and reuse MSG_STDIN from
server->client to mean that stdin should be enabled. Based on a diff
from Chris Johnsen.

/* $OpenBSD: server-fn.c,v 1.61 2012/09/03 08:48:57 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 <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

struct session *server_next_session(struct session *);
void		server_callback_identify(int, short, void *);

void
server_fill_environ(struct session *s, struct environ *env)
{
	char	var[MAXPATHLEN], *term;
	u_int	idx;
	long	pid;

	if (s != NULL) {
		term = options_get_string(&s->options, "default-terminal");
		environ_set(env, "TERM", term);

		idx = s->idx;
	} else
		idx = -1;
	pid = getpid();
	xsnprintf(var, sizeof var, "%s,%ld,%d", socket_path, pid, idx);
	environ_set(env, "TMUX", var);
}

void
server_write_ready(struct client *c)
{
	if (c->flags & CLIENT_CONTROL)
		return;
	server_write_client(c, MSG_READY, NULL, 0);
}

int
server_write_client(
    struct client *c, enum msgtype type, const void *buf, size_t len)
{
	struct imsgbuf	*ibuf = &c->ibuf;
	int              error;

	if (c->flags & CLIENT_BAD)
		return (-1);
	log_debug("writing %d to client %d", type, c->ibuf.fd);
	error = imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, -1,
	    (void *) buf, len);
	if (error == 1)
		server_update_event(c);
	return (error == 1 ? 0 : -1);
}

void
server_write_session(
    struct session *s, enum msgtype type, const void *buf, size_t len)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session == s)
			server_write_client(c, type, buf, len);
	}
}

void
server_redraw_client(struct client *c)
{
	c->flags |= CLIENT_REDRAW;
}

void
server_status_client(struct client *c)
{
	c->flags |= CLIENT_STATUS;
}

void
server_redraw_session(struct session *s)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session == s)
			server_redraw_client(c);
	}
}

void
server_redraw_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_find(s)) == NULL)
		server_redraw_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_redraw_session(s);
	}
}

void
server_status_session(struct session *s)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session == s)
			server_status_client(c);
	}
}

void
server_status_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_find(s)) == NULL)
		server_status_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_status_session(s);
	}
}

void
server_redraw_window(struct window *w)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session->curw->window == w)
			server_redraw_client(c);
	}
	w->flags |= WINDOW_REDRAW;
}

void
server_redraw_window_borders(struct window *w)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session->curw->window == w)
			c->flags |= CLIENT_BORDERS;
	}
}

void
server_status_window(struct window *w)
{
	struct session	*s;

	/*
	 * This is slightly different. We want to redraw the status line of any
	 * clients containing this window rather than any where it is the
	 * current window.
	 */

	RB_FOREACH(s, sessions, &sessions) {
		if (session_has(s, w) != NULL)
			server_status_session(s);
	}
}

void
server_lock(void)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		server_lock_client(c);
	}
}

void
server_lock_session(struct session *s)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL || c->session != s)
			continue;
		server_lock_client(c);
	}
}

void
server_lock_client(struct client *c)
{
	const char		*cmd;
	size_t			 cmdlen;
	struct msg_lock_data	 lockdata;

	if (c->flags & CLIENT_SUSPENDED)
		return;

	cmd = options_get_string(&c->session->options, "lock-command");
	cmdlen = strlcpy(lockdata.cmd, cmd, sizeof lockdata.cmd);
	if (cmdlen >= sizeof lockdata.cmd)
		return;

	tty_stop_tty(&c->tty);
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP));
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR));
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_E3));

	c->flags |= CLIENT_SUSPENDED;
	server_write_client(c, MSG_LOCK, &lockdata, sizeof lockdata);
}

void
server_kill_window(struct window *w)
{
	struct session	*s, *next_s;
	struct winlink	*wl;

	next_s = RB_MIN(sessions, &sessions);
	while (next_s != NULL) {
		s = next_s;
		next_s = RB_NEXT(sessions, &sessions, s);

		if (session_has(s, w) == NULL)
			continue;
		while ((wl = winlink_find_by_window(&s->windows, w)) != NULL) {
			if (session_detach(s, wl)) {
				server_destroy_session_group(s);
				break;
			} else
				server_redraw_session_group(s);
		}

		if (options_get_number(&s->options, "renumber-windows"))
			session_renumber_windows(s);
	}
}

int
server_link_window(struct session *src, struct winlink *srcwl,
    struct session *dst, int dstidx, int killflag, int selectflag, char **cause)
{
	struct winlink		*dstwl;
	struct session_group	*srcsg, *dstsg;

	srcsg = session_group_find(src);
	dstsg = session_group_find(dst);
	if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) {
		xasprintf(cause, "sessions are grouped");
		return (-1);
	}

	dstwl = NULL;
	if (dstidx != -1)
		dstwl = winlink_find_by_index(&dst->windows, dstidx);
	if (dstwl != NULL) {
		if (dstwl->window == srcwl->window) {
			xasprintf(cause, "same index: %d", dstidx);
			return (-1);
		}
		if (killflag) {
			/*
			 * Can't use session_detach as it will destroy session
			 * if this makes it empty.
			 */
			notify_window_unlinked(dst, dstwl->window);
			dstwl->flags &= ~WINLINK_ALERTFLAGS;
			winlink_stack_remove(&dst->lastw, dstwl);
			winlink_remove(&dst->windows, dstwl);

			/* Force select/redraw if current. */
			if (dstwl == dst->curw) {
				selectflag = 1;
				dst->curw = NULL;
			}
		}
	}

	if (dstidx == -1)
		dstidx = -1 - options_get_number(&dst->options, "base-index");
	dstwl = session_attach(dst, srcwl->window, dstidx, cause);
	if (dstwl == NULL)
		return (-1);

	if (selectflag)
		session_select(dst, dstwl->idx);
	server_redraw_session_group(dst);

	return (0);
}

void
server_unlink_window(struct session *s, struct winlink *wl)
{
	if (session_detach(s, wl))
		server_destroy_session_group(s);
	else
		server_redraw_session_group(s);
}

void
server_destroy_pane(struct window_pane *wp)
{
	struct window		*w = wp->window;
	int			 old_fd;
	struct screen_write_ctx	 ctx;
	struct grid_cell	 gc;

	old_fd = wp->fd;
	if (wp->fd != -1) {
		bufferevent_free(wp->event);
		close(wp->fd);
		wp->fd = -1;
	}

	if (options_get_number(&w->options, "remain-on-exit")) {
		if (old_fd == -1)
			return;
		screen_write_start(&ctx, wp, &wp->base);
		screen_write_scrollregion(&ctx, 0, screen_size_y(ctx.s) - 1);
		screen_write_cursormove(&ctx, 0, screen_size_y(ctx.s) - 1);
		screen_write_linefeed(&ctx, 1);
		memcpy(&gc, &grid_default_cell, sizeof gc);
		gc.attr |= GRID_ATTR_BRIGHT;
		screen_write_puts(&ctx, &gc, "Pane is dead");
		screen_write_stop(&ctx);
		wp->flags |= PANE_REDRAW;
		return;
	}

	layout_close_pane(wp);
	window_remove_pane(w, wp);

	if (TAILQ_EMPTY(&w->panes))
		server_kill_window(w);
	else
		server_redraw_window(w);
}

void
server_destroy_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_find(s)) == NULL)
		server_destroy_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_destroy_session(s);
		TAILQ_REMOVE(&session_groups, sg, entry);
		free(sg);
	}
}

struct session *
server_next_session(struct session *s)
{
	struct session *s_loop, *s_out;

	s_out = NULL;
	RB_FOREACH(s_loop, sessions, &sessions) {
		if (s_loop == s)
			continue;
		if (s_out == NULL ||
		    timercmp(&s_loop->activity_time, &s_out->activity_time, <))
			s_out = s_loop;
	}
	return (s_out);
}

void
server_destroy_session(struct session *s)
{
	struct client	*c;
	struct session	*s_new;
	u_int		 i;

	if (!options_get_number(&s->options, "detach-on-destroy"))
		s_new = server_next_session(s);
	else
		s_new = NULL;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session != s)
			continue;
		if (s_new == NULL) {
			c->session = NULL;
			c->flags |= CLIENT_EXIT;
		} else {
			c->last_session = NULL;
			c->session = s_new;
			notify_attached_session_changed(c);
			session_update_activity(s_new);
			server_redraw_client(c);
		}
	}
	recalculate_sizes();
}

void
server_check_unattached (void)
{
	struct session	*s;

	/*
	 * If any sessions are no longer attached and have destroy-unattached
	 * set, collect them.
	 */
	RB_FOREACH(s, sessions, &sessions) {
		if (!(s->flags & SESSION_UNATTACHED))
			continue;
		if (options_get_number (&s->options, "destroy-unattached"))
			session_destroy(s);
	}
}

void
server_set_identify(struct client *c)
{
	struct timeval	tv;
	int		delay;

	delay = options_get_number(&c->session->options, "display-panes-time");
	tv.tv_sec = delay / 1000;
	tv.tv_usec = (delay % 1000) * 1000L;

	if (event_initialized (&c->identify_timer))
		evtimer_del(&c->identify_timer);
	evtimer_set(&c->identify_timer, server_callback_identify, c);
	evtimer_add(&c->identify_timer, &tv);

	c->flags |= CLIENT_IDENTIFY;
	c->tty.flags |= (TTY_FREEZE|TTY_NOCURSOR);
	server_redraw_client(c);
}

void
server_clear_identify(struct client *c)
{
	if (c->flags & CLIENT_IDENTIFY) {
		c->flags &= ~CLIENT_IDENTIFY;
		c->tty.flags &= ~(TTY_FREEZE|TTY_NOCURSOR);
		server_redraw_client(c);
	}
}

/* ARGSUSED */
void
server_callback_identify(unused int fd, unused short events, void *data)
{
	struct client	*c = data;

	server_clear_identify(c);
}

void
server_update_event(struct client *c)
{
	short	events;

	events = 0;
	if (!(c->flags & CLIENT_BAD))
		events |= EV_READ;
	if (c->ibuf.w.queued > 0)
		events |= EV_WRITE;
	if (event_initialized(&c->event))
		event_del(&c->event);
	event_set(&c->event, c->ibuf.fd, events, server_client_callback, c);
	event_add(&c->event, NULL);
}

/* Push stdout to client if possible. */
void
server_push_stdout(struct client *c)
{
	struct msg_stdout_data data;
	size_t                 size;

	size = EVBUFFER_LENGTH(c->stdout_data);
	if (size == 0)
		return;
	if (size > sizeof data.data)
		size = sizeof data.data;

	memcpy(data.data, EVBUFFER_DATA(c->stdout_data), size);
	data.size = size;

	if (server_write_client(c, MSG_STDOUT, &data, sizeof data) == 0)
		evbuffer_drain(c->stdout_data, size);
}

/* Push stderr to client if possible. */
void
server_push_stderr(struct client *c)
{
	struct msg_stderr_data data;
	size_t                 size;

	size = EVBUFFER_LENGTH(c->stderr_data);
	if (size == 0)
		return;
	if (size > sizeof data.data)
		size = sizeof data.data;

	memcpy(data.data, EVBUFFER_DATA(c->stderr_data), size);
	data.size = size;

	if (server_write_client(c, MSG_STDERR, &data, sizeof data) == 0)
		evbuffer_drain(c->stderr_data, size);
}

/* Set stdin callback. */
int
server_set_stdin_callback(struct client *c, void (*cb)(struct client *, int,
    void *), void *cb_data, char **cause)
{
	if (c == NULL) {
		*cause = xstrdup("no client with stdin");
		return (-1);
	}
	if (c->flags & CLIENT_TERMINAL) {
		*cause = xstrdup("stdin is a tty");
		return (-1);
	}
	if (c->stdin_callback != NULL) {
		*cause = xstrdup("stdin in use");
		return (-1);
	}

	c->stdin_callback_data = cb_data;
	c->stdin_callback = cb;

	c->references++;

	if (c->stdin_closed)
		c->stdin_callback (c, 1, c->stdin_callback_data);

	server_write_client(c, MSG_STDIN, NULL, 0);

	return (0);
}