tmux/server-client.c
Tiago Cunha d7bae0edce Sync OpenBSD patchset 741:
When changing so that the client passes its stdout and stderr as well as
stdin up to the server, I forgot one essential point - the tmux server
could now be both the producer and consumer. This happens when tmux is
run inside tmux, as well as when piping tmux commands together.

So, using stdio(3) was a bad idea - if sufficient data was written, this
could block in write(2). When that happened and the server was both
producer and consumer, it deadlocks.

Change to use libevent bufferevents for the client stdin, stdout and
stderr instead. This is trivial enough for output but requires a
callback mechanism to trigger when stdin is finished.

This relies on the underlying polling mechanism for libevent to work
with whatever devices to which the user could redirect stdin, stdout or
stderr, hence the change to use poll(2) over kqueue(2) for tmux.
2010-08-09 21:44:25 +00:00

899 lines
22 KiB
C

/* $Id: server-client.c,v 1.37 2010-08-09 21:44:25 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_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");
if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -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_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 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 {
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(imsg.fd, NULL, NULL,
server_client_in_callback, c);
if (c->stdin_event == NULL)
fatalx("failed to create stdin event");
if ((mode = fcntl(imsg.fd, F_GETFL)) != -1)
fcntl(imsg.fd, F_SETFL, mode|O_NONBLOCK);
if (fcntl(imsg.fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
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(imsg.fd, NULL, NULL,
server_client_out_callback, c);
if (c->stdout_event == NULL)
fatalx("failed to create stdout event");
if ((mode = fcntl(imsg.fd, F_GETFL)) != -1)
fcntl(imsg.fd, F_SETFL, mode|O_NONBLOCK);
if (fcntl(imsg.fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
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(imsg.fd, NULL, NULL,
server_client_err_callback, c);
if (c->stderr_event == NULL)
fatalx("failed to create stderr event");
if ((mode = fcntl(imsg.fd, F_GETFL)) != -1)
fcntl(imsg.fd, F_SETFL, mode|O_NONBLOCK);
if (fcntl(imsg.fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
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 */
}