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/* $Id: server-client.c,v 1.45 2010/10/24 01:51:34 tcunha Exp $ */

/*
* Copyright (c) 2009 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 <event.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

void server_client_handle_key(int, struct mouse_event *, void *);
void server_client_repeat_timer(int, short, void *);
void server_client_check_exit(struct client *);
void server_client_check_backoff(struct client *);
void server_client_check_redraw(struct client *);
void server_client_set_title(struct client *);
void server_client_reset_state(struct client *);
void server_client_in_callback(struct bufferevent *, short, void *);
void server_client_out_callback(struct bufferevent *, short, void *);
void server_client_err_callback(struct bufferevent *, short, void *);

int server_client_msg_dispatch(struct client *);
void server_client_msg_command(struct client *, struct msg_command_data *);
void server_client_msg_identify(
struct client *, struct msg_identify_data *, int);
void server_client_msg_shell(struct client *);

void printflike2 server_client_msg_error(struct cmd_ctx *, const char *, ...);
void printflike2 server_client_msg_print(struct cmd_ctx *, const char *, ...);
void printflike2 server_client_msg_info(struct cmd_ctx *, const char *, ...);

/* Create a new client. */
void
server_client_create(int fd)
{
struct client *c;
int mode;
u_int i;

if ((mode = fcntl(fd, F_GETFL)) == -1)
fatal("fcntl failed");
if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
fatal("fcntl failed");

c = xcalloc(1, sizeof *c);
c->references = 0;
imsg_init(&c->ibuf, fd);
server_update_event(c);

if (gettimeofday(&c->creation_time, NULL) != 0)
fatal("gettimeofday failed");
memcpy(&c->activity_time, &c->creation_time, sizeof c->activity_time);

ARRAY_INIT(&c->prompt_hdata);

c->stdin_event = NULL;
c->stdout_event = NULL;
c->stderr_event = NULL;

c->tty.fd = -1;
c->title = NULL;

c->session = NULL;
c->tty.sx = 80;
c->tty.sy = 24;

screen_init(&c->status, c->tty.sx, 1, 0);
job_tree_init(&c->status_jobs);

c->message_string = NULL;
ARRAY_INIT(&c->message_log);

c->prompt_string = NULL;
c->prompt_buffer = NULL;
c->prompt_index = 0;

evtimer_set(&c->repeat_timer, server_client_repeat_timer, c);

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) == NULL) {
ARRAY_SET(&clients, i, c);
return;
}
}
ARRAY_ADD(&clients, c);
log_debug("new client %d", fd);
}

/* Lost a client. */
void
server_client_lost(struct client *c)
{
struct message_entry *msg;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) == c)
ARRAY_SET(&clients, i, NULL);
}
log_debug("lost client %d", c->ibuf.fd);

/*
* If CLIENT_TERMINAL hasn't been set, then tty_init hasn't been called
* and tty_free might close an unrelated fd.
*/
if (c->flags & CLIENT_TERMINAL)
tty_free(&c->tty);

if (c->stdin_fd != -1)
close(c->stdin_fd);
if (c->stdin_event != NULL)
bufferevent_free(c->stdin_event);
if (c->stdout_fd != -1)
close(c->stdout_fd);
if (c->stdout_event != NULL)
bufferevent_free(c->stdout_event);
if (c->stderr_fd != -1)
close(c->stderr_fd);
if (c->stderr_event != NULL)
bufferevent_free(c->stderr_event);

screen_free(&c->status);
job_tree_free(&c->status_jobs);

if (c->title != NULL)
xfree(c->title);

evtimer_del(&c->repeat_timer);

evtimer_del(&c->identify_timer);

if (c->message_string != NULL)
xfree(c->message_string);
evtimer_del(&c->message_timer);
for (i = 0; i < ARRAY_LENGTH(&c->message_log); i++) {
msg = &ARRAY_ITEM(&c->message_log, i);
xfree(msg->msg);
}
ARRAY_FREE(&c->message_log);

if (c->prompt_string != NULL)
xfree(c->prompt_string);
if (c->prompt_buffer != NULL)
xfree(c->prompt_buffer);
for (i = 0; i < ARRAY_LENGTH(&c->prompt_hdata); i++)
xfree(ARRAY_ITEM(&c->prompt_hdata, i));
ARRAY_FREE(&c->prompt_hdata);

if (c->cwd != NULL)
xfree(c->cwd);

close(c->ibuf.fd);
imsg_clear(&c->ibuf);
event_del(&c->event);

for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
if (ARRAY_ITEM(&dead_clients, i) == NULL) {
ARRAY_SET(&dead_clients, i, c);
break;
}
}
if (i == ARRAY_LENGTH(&dead_clients))
ARRAY_ADD(&dead_clients, c);
c->flags |= CLIENT_DEAD;

recalculate_sizes();
server_check_unattached();
server_update_socket();
}

/* Process a single client event. */
void
server_client_callback(int fd, short events, void *data)
{
struct client *c = data;

if (c->flags & CLIENT_DEAD)
return;

if (fd == c->ibuf.fd) {
if (events & EV_WRITE && msgbuf_write(&c->ibuf.w) < 0)
goto client_lost;

if (c->flags & CLIENT_BAD) {
if (c->ibuf.w.queued == 0)
goto client_lost;
return;
}

if (events & EV_READ && server_client_msg_dispatch(c) != 0)
goto client_lost;
}

server_update_event(c);
return;

client_lost:
server_client_lost(c);
}

/* Handle client status timer. */
void
server_client_status_timer(void)
{
struct client *c;
struct session *s;
struct job *job;
struct timeval tv;
u_int i;
int interval;
time_t difference;

if (gettimeofday(&tv, NULL) != 0)
fatal("gettimeofday failed");

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->message_string != NULL || c->prompt_string != NULL) {
/*
* Don't need timed redraw for messages/prompts so bail
* now. The status timer isn't reset when they are
* redrawn anyway.
*/
continue;
}
s = c->session;

if (!options_get_number(&s->options, "status"))
continue;
interval = options_get_number(&s->options, "status-interval");

difference = tv.tv_sec - c->status_timer.tv_sec;
if (difference >= interval) {
RB_FOREACH(job, jobs, &c->status_jobs)
job_run(job);
c->flags |= CLIENT_STATUS;
}
}
}

/* Handle data key input from client. */
void
server_client_handle_key(int key, struct mouse_event *mouse, void *data)
{
struct client *c = data;
struct session *s;
struct window *w;
struct window_pane *wp;
struct options *oo;
struct timeval tv;
struct key_binding *bd;
struct keylist *keylist;
int xtimeout, isprefix;
u_int i;

/* Check the client is good to accept input. */
if ((c->flags & (CLIENT_DEAD|CLIENT_SUSPENDED)) != 0)
return;
if (c->session == NULL)
return;
s = c->session;

/* Update the activity timer. */
if (gettimeofday(&c->activity_time, NULL) != 0)
fatal("gettimeofday failed");
memcpy(&s->activity_time, &c->activity_time, sizeof s->activity_time);

w = c->session->curw->window;
wp = w->active;
oo = &c->session->options;

/* Special case: number keys jump to pane in identify mode. */
if (c->flags & CLIENT_IDENTIFY && key >= '0' && key <= '9') {
if (c->flags & CLIENT_READONLY)
return;
wp = window_pane_at_index(w, key - '0');
if (wp != NULL && window_pane_visible(wp))
window_set_active_pane(w, wp);
server_clear_identify(c);
return;
}

/* Handle status line. */
if (!(c->flags & CLIENT_READONLY)) {
status_message_clear(c);
server_clear_identify(c);
}
if (c->prompt_string != NULL) {
if (!(c->flags & CLIENT_READONLY))
status_prompt_key(c, key);
return;
}

/* Check for mouse keys. */
if (key == KEYC_MOUSE) {
if (c->flags & CLIENT_READONLY)
return;
if (options_get_number(oo, "mouse-select-pane")) {
window_set_active_at(w, mouse->x, mouse->y);
server_redraw_window_borders(w);
wp = w->active;
}
window_pane_mouse(wp, c->session, mouse);
return;
}

/* Is this a prefix key? */
keylist = options_get_data(&c->session->options, "prefix");
isprefix = 0;
for (i = 0; i < ARRAY_LENGTH(keylist); i++) {
if (key == ARRAY_ITEM(keylist, i)) {
isprefix = 1;
break;
}
}

/* No previous prefix key. */
if (!(c->flags & CLIENT_PREFIX)) {
if (isprefix)
c->flags |= CLIENT_PREFIX;
else {
/* Try as a non-prefix key binding. */
if ((bd = key_bindings_lookup(key)) == NULL) {
if (!(c->flags & CLIENT_READONLY))
window_pane_key(wp, c->session, key);
} else
key_bindings_dispatch(bd, c);
}
return;
}

/* Prefix key already pressed. Reset prefix and lookup key. */
c->flags &= ~CLIENT_PREFIX;
if ((bd = key_bindings_lookup(key | KEYC_PREFIX)) == NULL) {
/* If repeating, treat this as a key, else ignore. */
if (c->flags & CLIENT_REPEAT) {
c->flags &= ~CLIENT_REPEAT;
if (isprefix)
c->flags |= CLIENT_PREFIX;
else if (!(c->flags & CLIENT_READONLY))
window_pane_key(wp, c->session, key);
}
return;
}

/* If already repeating, but this key can't repeat, skip it. */
if (c->flags & CLIENT_REPEAT && !bd->can_repeat) {
c->flags &= ~CLIENT_REPEAT;
if (isprefix)
c->flags |= CLIENT_PREFIX;
else if (!(c->flags & CLIENT_READONLY))
window_pane_key(wp, c->session, key);
return;
}

/* If this key can repeat, reset the repeat flags and timer. */
xtimeout = options_get_number(&c->session->options, "repeat-time");
if (xtimeout != 0 && bd->can_repeat) {
c->flags |= CLIENT_PREFIX|CLIENT_REPEAT;

tv.tv_sec = xtimeout / 1000;
tv.tv_usec = (xtimeout % 1000) * 1000L;
evtimer_del(&c->repeat_timer);
evtimer_add(&c->repeat_timer, &tv);
}

/* Dispatch the command. */
key_bindings_dispatch(bd, c);
}

/* Client functions that need to happen every loop. */
void
server_client_loop(void)
{
struct client *c;
struct window *w;
struct window_pane *wp;
u_int i;

for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL)
continue;

server_client_check_exit(c);
if (c->session != NULL) {
server_client_check_redraw(c);
server_client_reset_state(c);
}
}

/*
* Any windows will have been redrawn as part of clients, so clear
* their flags now.
*/
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
w = ARRAY_ITEM(&windows, i);
if (w == NULL)
continue;

w->flags &= ~WINDOW_REDRAW;
TAILQ_FOREACH(wp, &w->panes, entry)
wp->flags &= ~PANE_REDRAW;
}
}

/*
* Update cursor position and mode settings. The scroll region and attributes
* are cleared when idle (waiting for an event) as this is the most likely time
* a user may interrupt tmux, for example with ~^Z in ssh(1). This is a
* compromise between excessive resets and likelihood of an interrupt.
*
* tty_region/tty_reset/tty_update_mode already take care of not resetting
* things that are already in their default state.
*/
void
server_client_reset_state(struct client *c)
{
struct window *w = c->session->curw->window;
struct window_pane *wp = w->active;
struct screen *s = wp->screen;
struct options *oo = &c->session->options;
int status, mode;

tty_region(&c->tty, 0, c->tty.sy - 1);

status = options_get_number(oo, "status");
if (!window_pane_visible(wp) || wp->yoff + s->cy >= c->tty.sy - status)
tty_cursor(&c->tty, 0, 0);
else
tty_cursor(&c->tty, wp->xoff + s->cx, wp->yoff + s->cy);

mode = s->mode;
if (TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry) != NULL &&
options_get_number(oo, "mouse-select-pane"))
mode |= MODE_MOUSE;
tty_update_mode(&c->tty, mode);
tty_reset(&c->tty);
}

/* Repeat time callback. */
/* ARGSUSED */
void
server_client_repeat_timer(unused int fd, unused short events, void *data)
{
struct client *c = data;

if (c->flags & CLIENT_REPEAT)
c->flags &= ~(CLIENT_PREFIX|CLIENT_REPEAT);
}

/* Check if client should be exited. */
void
server_client_check_exit(struct client *c)
{
struct msg_exit_data exitdata;

if (!(c->flags & CLIENT_EXIT))
return;

if (c->stdout_fd != -1 && c->stdout_event != NULL &&
EVBUFFER_LENGTH(c->stdout_event->output) != 0)
return;
if (c->stderr_fd != -1 && c->stderr_event != NULL &&
EVBUFFER_LENGTH(c->stderr_event->output) != 0)
return;

exitdata.retcode = c->retcode;
server_write_client(c, MSG_EXIT, &exitdata, sizeof exitdata);

c->flags &= ~CLIENT_EXIT;
}

/*
* Check if the client should backoff. During backoff, data from external
* programs is not written to the terminal. When the existing data drains, the
* client is redrawn.
*
* There are two backoff phases - both the tty and client have backoff flags -
* the first to allow existing data to drain and the latter to ensure backoff
* is disabled until the redraw has finished and prevent the redraw triggering
* another backoff.
*/
void
server_client_check_backoff(struct client *c)
{
struct tty *tty = &c->tty;
size_t used;

used = EVBUFFER_LENGTH(tty->event->output);

/*
* If in the second backoff phase (redrawing), don't check backoff
* until the redraw has completed (or enough of it to drop below the
* backoff threshold).
*/
if (c->flags & CLIENT_BACKOFF) {
if (used > BACKOFF_THRESHOLD)
return;
c->flags &= ~CLIENT_BACKOFF;
return;
}

/* Once drained, allow data through again and schedule redraw. */
if (tty->flags & TTY_BACKOFF) {
if (used != 0)
return;
tty->flags &= ~TTY_BACKOFF;
c->flags |= (CLIENT_BACKOFF|CLIENT_REDRAWWINDOW|CLIENT_STATUS);
return;
}

/* If too much data, start backoff. */
if (used > BACKOFF_THRESHOLD)
tty->flags |= TTY_BACKOFF;
}

/* Check for client redraws. */
void
server_client_check_redraw(struct client *c)
{
struct session *s = c->session;
struct window_pane *wp;
int flags, redraw;

flags = c->tty.flags & TTY_FREEZE;
c->tty.flags &= ~TTY_FREEZE;

if (c->flags & (CLIENT_REDRAW|CLIENT_STATUS)) {
if (options_get_number(&s->options, "set-titles"))
server_client_set_title(c);

if (c->message_string != NULL)
redraw = status_message_redraw(c);
else if (c->prompt_string != NULL)
redraw = status_prompt_redraw(c);
else
redraw = status_redraw(c);
if (!redraw)
c->flags &= ~CLIENT_STATUS;
}

if (c->flags & CLIENT_REDRAW) {
screen_redraw_screen(c, 0, 0);
c->flags &= ~(CLIENT_STATUS|CLIENT_BORDERS);
} else if (c->flags & CLIENT_REDRAWWINDOW) {
TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry)
screen_redraw_pane(c, wp);
c->flags &= ~CLIENT_REDRAWWINDOW;
} else {
TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry) {
if (wp->flags & PANE_REDRAW)
screen_redraw_pane(c, wp);
}
}

if (c->flags & CLIENT_BORDERS)
screen_redraw_screen(c, 0, 1);

if (c->flags & CLIENT_STATUS)
screen_redraw_screen(c, 1, 0);

c->tty.flags |= flags;

c->flags &= ~(CLIENT_REDRAW|CLIENT_STATUS|CLIENT_BORDERS);
}

/* Set client title. */
void
server_client_set_title(struct client *c)
{
struct session *s = c->session;
const char *template;
char *title;

template = options_get_string(&s->options, "set-titles-string");

title = status_replace(c, NULL, template, time(NULL), 1);
if (c->title == NULL || strcmp(title, c->title) != 0) {
if (c->title != NULL)
xfree(c->title);
c->title = xstrdup(title);
tty_set_title(&c->tty, c->title);
}
xfree(title);
}

/*
* Error callback for client stdin. Caller must increase reference count when
* enabling event!
*/
void
server_client_in_callback(
    unused struct bufferevent *bufev, unused short what, void *data)
{
struct client *c = data;

c->references--;
if (c->flags & CLIENT_DEAD)
return;

bufferevent_disable(c->stdin_event, EV_READ|EV_WRITE);
close(c->stdin_fd);
c->stdin_fd = -1;

if (c->stdin_callback != NULL)
c->stdin_callback(c, c->stdin_data);
}

/* Error callback for client stdout. */
void
server_client_out_callback(
    unused struct bufferevent *bufev, unused short what, unused void *data)
{
struct client *c = data;

bufferevent_disable(c->stdout_event, EV_READ|EV_WRITE);
close(c->stdout_fd);
c->stdout_fd = -1;
}

/* Error callback for client stderr. */
void
server_client_err_callback(
    unused struct bufferevent *bufev, unused short what, unused void *data)
{
struct client *c = data;

bufferevent_disable(c->stderr_event, EV_READ|EV_WRITE);
close(c->stderr_fd);
c->stderr_fd = -1;
}

/* Dispatch message from client. */
int
server_client_msg_dispatch(struct client *c)
{
struct imsg imsg;
struct msg_command_data commanddata;
struct msg_identify_data identifydata;
struct msg_environ_data environdata;
ssize_t n, datalen;
int mode;

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_client_msg_command(c, &commanddata);
break;
case MSG_IDENTIFY:
if (datalen != sizeof identifydata)
fatalx("bad MSG_IDENTIFY size");
if (imsg.fd == -1)
fatalx("MSG_IDENTIFY missing fd");
memcpy(&identifydata, imsg.data, sizeof identifydata);

c->stdin_fd = imsg.fd;
c->stdin_event = bufferevent_new(c->stdin_fd,
NULL, NULL, server_client_in_callback, c);
if (c->stdin_event == NULL)
fatalx("failed to create stdin event");

if ((mode = fcntl(c->stdin_fd, F_GETFL)) != -1)
fcntl(c->stdin_fd, F_SETFL, mode|O_NONBLOCK);

server_client_msg_identify(c, &identifydata, imsg.fd);
break;
case MSG_STDOUT:
if (datalen != 0)
fatalx("bad MSG_STDOUT size");
if (imsg.fd == -1)
fatalx("MSG_STDOUT missing fd");

c->stdout_fd = imsg.fd;
c->stdout_event = bufferevent_new(c->stdout_fd,
NULL, NULL, server_client_out_callback, c);
if (c->stdout_event == NULL)
fatalx("failed to create stdout event");

if ((mode = fcntl(c->stdout_fd, F_GETFL)) != -1)
fcntl(c->stdout_fd, F_SETFL, mode|O_NONBLOCK);
break;
case MSG_STDERR:
if (datalen != 0)
fatalx("bad MSG_STDERR size");
if (imsg.fd == -1)
fatalx("MSG_STDERR missing fd");

c->stderr_fd = imsg.fd;
c->stderr_event = bufferevent_new(c->stderr_fd,
NULL, NULL, server_client_err_callback, c);
if (c->stderr_event == NULL)
fatalx("failed to create stderr event");

if ((mode = fcntl(c->stderr_fd, F_GETFL)) != -1)
fcntl(c->stderr_fd, F_SETFL, mode|O_NONBLOCK);
break;
case MSG_RESIZE:
if (datalen != 0)
fatalx("bad MSG_RESIZE size");

if (tty_resize(&c->tty)) {
recalculate_sizes();
server_redraw_client(c);
}
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_WAKEUP:
case MSG_UNLOCK:
if (datalen != 0)
fatalx("bad MSG_WAKEUP size");

if (!(c->flags & CLIENT_SUSPENDED))
break;
c->flags &= ~CLIENT_SUSPENDED;

if (gettimeofday(&c->activity_time, NULL) != 0)
fatal("gettimeofday");
if (c->session != NULL) {
memcpy(&c->session->activity_time,
&c->activity_time,
sizeof c->session->activity_time);
}

tty_start_tty(&c->tty);
server_redraw_client(c);
recalculate_sizes();
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;
case MSG_SHELL:
if (datalen != 0)
fatalx("bad MSG_SHELL size");

server_client_msg_shell(c);
break;
default:
fatalx("unexpected message");
}

imsg_free(&imsg);
}
}

/* Callback to send error message to client. */
void printflike2
server_client_msg_error(struct cmd_ctx *ctx, const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
evbuffer_add_vprintf(ctx->cmdclient->stderr_event->output, fmt, ap);
va_end(ap);

bufferevent_write(ctx->cmdclient->stderr_event, "\n", 1);
ctx->cmdclient->retcode = 1;
}

/* Callback to send print message to client. */
void printflike2
server_client_msg_print(struct cmd_ctx *ctx, const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
va_end(ap);

bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
}

/* Callback to send print message to client, if not quiet. */
void printflike2
server_client_msg_info(struct cmd_ctx *ctx, const char *fmt, ...)
{
va_list ap;

if (options_get_number(&global_options, "quiet"))
return;

va_start(ap, fmt);
evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
va_end(ap);

bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
}

/* Handle command message. */
void
server_client_msg_command(struct client *c, struct msg_command_data *data)
{
struct cmd_ctx ctx;
struct cmd_list *cmdlist = NULL;
int argc;
char **argv, *cause;

ctx.error = server_client_msg_error;
ctx.print = server_client_msg_print;
ctx.info = server_client_msg_info;

ctx.msgdata = data;
ctx.curclient = 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_client_msg_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_client_msg_error(&ctx, "%s", cause);
cmd_free_argv(argc, argv);
goto error;
}
cmd_free_argv(argc, argv);

if (cmd_list_exec(cmdlist, &ctx) != 1)
c->flags |= CLIENT_EXIT;
cmd_list_free(cmdlist);
return;

error:
if (cmdlist != NULL)
cmd_list_free(cmdlist);
c->flags |= CLIENT_EXIT;
}

/* Handle identify message. */
void
server_client_msg_identify(
    struct client *c, struct msg_identify_data *data, int fd)
{
int tty_fd;

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

if (!isatty(fd))
return;
if ((tty_fd = dup(fd)) == -1)
fatal("dup failed");
data->term[(sizeof data->term) - 1] = '\0';
tty_init(&c->tty, tty_fd, 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;
c->tty.key_callback = server_client_handle_key;
c->tty.key_data = c;

tty_resize(&c->tty);

c->flags |= CLIENT_TERMINAL;
}

/* Handle shell message. */
void
server_client_msg_shell(struct client *c)
{
struct msg_shell_data data;
const char *shell;

shell = options_get_string(&global_s_options, "default-shell");

if (*shell == '\0' || areshell(shell))
shell = _PATH_BSHELL;
if (strlcpy(data.shell, shell, sizeof data.shell) >= sizeof data.shell)
strlcpy(data.shell, _PATH_BSHELL, sizeof data.shell);

server_write_client(c, MSG_SHELL, &data, sizeof data);
c->flags |= CLIENT_BAD; /* it will die after exec */
}
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