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/* $Id: server.c,v 1.254 2011/04/06 22:16:33 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 <event.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include "tmux.h"
/*
* Main server functions.
*/
/* Client list. */
struct clients clients;
struct clients dead_clients;
int server_fd;
int server_shutdown;
struct event server_ev_accept;
struct event server_ev_second;
struct paste_stack global_buffers;
int server_create_socket(void);
void server_loop(void);
int server_should_shutdown(void);
void server_send_shutdown(void);
void server_clean_dead(void);
void server_accept_callback(int, short, void *);
void server_signal_callback(int, short, void *);
void server_child_signal(void);
void server_child_exited(pid_t, int);
void server_child_stopped(pid_t, int);
void server_second_callback(int, short, void *);
void server_lock_server(void);
void server_lock_sessions(void);
/* Create server socket. */
int
server_create_socket(void)
{
struct sockaddr_un sa;
size_t size;
mode_t mask;
int fd;
memset(&sa, 0, sizeof sa);
sa.sun_family = AF_UNIX;
size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
if (size >= sizeof sa.sun_path) {
errno = ENAMETOOLONG;
fatal("socket failed");
}
unlink(sa.sun_path);
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
fatal("socket failed");
mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
fatal("bind failed");
umask(mask);
if (listen(fd, 16) == -1)
fatal("listen failed");
setblocking(fd, 0);
server_update_socket();
return (fd);
}
/* Fork new server. */
int
server_start(void)
{
struct window_pane *wp;
int pair[2];
char *cause;
struct timeval tv;
u_int i;
/* The first client is special and gets a socketpair; create it. */
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
fatal("socketpair failed");
switch (fork()) {
case -1:
fatal("fork failed");
case 0:
break;
default:
close(pair[1]);
return (pair[0]);
}
close(pair[0]);
/*
* Must daemonise before loading configuration as the PID changes so
* $TMUX would be wrong for sessions created in the config file.
*/
if (daemon(1, 0) != 0)
fatal("daemon failed");
/* event_init() was called in our parent, need to reinit. */
if (event_reinit(ev_base) != 0)
fatal("event_reinit failed");
clear_signals(0);
logfile("server");
log_debug("server started, pid %ld", (long) getpid());
ARRAY_INIT(&windows);
RB_INIT(&all_window_panes);
ARRAY_INIT(&clients);
ARRAY_INIT(&dead_clients);
RB_INIT(&sessions);
RB_INIT(&dead_sessions);
TAILQ_INIT(&session_groups);
ARRAY_INIT(&global_buffers);
mode_key_init_trees();
key_bindings_init();
utf8_build();
start_time = time(NULL);
log_debug("socket path %s", socket_path);
#ifdef HAVE_SETPROCTITLE
setproctitle("server (%s)", socket_path);
#endif
server_fd = server_create_socket();
server_client_create(pair[1]);
if (access(SYSTEM_CFG, R_OK) == 0)
load_cfg(SYSTEM_CFG, NULL, &cfg_causes);
else if (errno != ENOENT) {
cfg_add_cause(
&cfg_causes, "%s: %s", strerror(errno), SYSTEM_CFG);
}
if (cfg_file != NULL)
load_cfg(cfg_file, NULL, &cfg_causes);
/*
* If there is a session already, put the current window and pane into
* more mode.
*/
if (!RB_EMPTY(&sessions) && !ARRAY_EMPTY(&cfg_causes)) {
wp = RB_MIN(sessions, &sessions)->curw->window->active;
window_pane_set_mode(wp, &window_copy_mode);
window_copy_init_for_output(wp);
for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
cause = ARRAY_ITEM(&cfg_causes, i);
window_copy_add(wp, "%s", cause);
xfree(cause);
}
ARRAY_FREE(&cfg_causes);
}
cfg_finished = 1;
event_set(&server_ev_accept,
server_fd, EV_READ|EV_PERSIST, server_accept_callback, NULL);
event_add(&server_ev_accept, NULL);
memset(&tv, 0, sizeof tv);
tv.tv_sec = 1;
evtimer_set(&server_ev_second, server_second_callback, NULL);
evtimer_add(&server_ev_second, &tv);
set_signals(server_signal_callback);
server_loop();
exit(0);
}
/* Main server loop. */
void
server_loop(void)
{
while (!server_should_shutdown()) {
event_loop(EVLOOP_ONCE);
server_window_loop();
server_client_loop();
key_bindings_clean();
server_clean_dead();
}
}
/* Check if the server should be shutting down (no more clients or sessions). */
int
server_should_shutdown(void)
{
u_int i;
if (!options_get_number(&global_options, "exit-unattached")) {
if (!RB_EMPTY(&sessions))
return (0);
}
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) != NULL)
return (0);
}
return (1);
}
/* Shutdown the server by killing all clients and windows. */
void
server_send_shutdown(void)
{
struct client *c;
struct session *s, *next_s;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c != NULL) {
if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
server_client_lost(c);
else
server_write_client(c, MSG_SHUTDOWN, NULL, 0);
c->session = NULL;
}
}
s = RB_MIN(sessions, &sessions);
while (s != NULL) {
next_s = RB_NEXT(sessions, &sessions, s);
session_destroy(s);
s = next_s;
}
}
/* Free dead, unreferenced clients and sessions. */
void
server_clean_dead(void)
{
struct session *s, *next_s;
struct client *c;
u_int i;
s = RB_MIN(sessions, &dead_sessions);
while (s != NULL) {
next_s = RB_NEXT(sessions, &dead_sessions, s);
if (s->references == 0) {
RB_REMOVE(sessions, &dead_sessions, s);
xfree(s->name);
xfree(s);
}
s = next_s;
}
for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
c = ARRAY_ITEM(&dead_clients, i);
if (c == NULL || c->references != 0)
continue;
ARRAY_SET(&dead_clients, i, NULL);
xfree(c);
}
}
/* Update socket execute permissions based on whether sessions are attached. */
void
server_update_socket(void)
{
struct session *s;
static int last = -1;
int n, mode;
struct stat sb;
n = 0;
RB_FOREACH(s, sessions, &sessions) {
if (!(s->flags & SESSION_UNATTACHED)) {
n++;
break;
}
}
if (n != last) {
last = n;
if (stat(socket_path, &sb) != 0)
return;
mode = sb.st_mode;
if (n != 0) {
if (mode & S_IRUSR)
mode |= S_IXUSR;
if (mode & S_IRGRP)
mode |= S_IXGRP;
if (mode & S_IROTH)
mode |= S_IXOTH;
} else
mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
chmod(socket_path, mode);
}
}
/* Callback for server socket. */
/* ARGSUSED */
void
server_accept_callback(int fd, short events, unused void *data)
{
struct sockaddr_storage sa;
socklen_t slen = sizeof sa;
int newfd;
if (!(events & EV_READ))
return;
newfd = accept(fd, (struct sockaddr *) &sa, &slen);
if (newfd == -1) {
if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
return;
fatal("accept failed");
}
if (server_shutdown) {
close(newfd);
return;
}
server_client_create(newfd);
}
/* Signal handler. */
/* ARGSUSED */
void
server_signal_callback(int sig, unused short events, unused void *data)
{
switch (sig) {
case SIGTERM:
server_shutdown = 1;
server_send_shutdown();
break;
case SIGCHLD:
server_child_signal();
break;
case SIGUSR1:
event_del(&server_ev_accept);
close(server_fd);
server_fd = server_create_socket();
event_set(&server_ev_accept, server_fd,
EV_READ|EV_PERSIST, server_accept_callback, NULL);
event_add(&server_ev_accept, NULL);
break;
}
}
/* Handle SIGCHLD. */
void
server_child_signal(void)
{
int status;
pid_t pid;
for (;;) {
switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
case -1:
if (errno == ECHILD)
return;
fatal("waitpid failed");
case 0:
return;
}
if (WIFSTOPPED(status))
server_child_stopped(pid, status);
else if (WIFEXITED(status) || WIFSIGNALED(status))
server_child_exited(pid, status);
}
}
/* Handle exited children. */
void
server_child_exited(pid_t pid, int status)
{
struct window *w;
struct window_pane *wp;
struct job *job;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
if ((w = ARRAY_ITEM(&windows, i)) == NULL)
continue;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (wp->pid == pid) {
server_destroy_pane(wp);
break;
}
}
}
LIST_FOREACH(job, &all_jobs, lentry) {
if (pid == job->pid) {
job_died(job, status); /* might free job */
break;
}
}
}
/* Handle stopped children. */
void
server_child_stopped(pid_t pid, int status)
{
struct window *w;
struct window_pane *wp;
u_int i;
if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
return;
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
if ((w = ARRAY_ITEM(&windows, i)) == NULL)
continue;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (wp->pid == pid) {
if (killpg(pid, SIGCONT) != 0)
kill(pid, SIGCONT);
}
}
}
}
/* Handle once-per-second timer events. */
/* ARGSUSED */
void
server_second_callback(unused int fd, unused short events, unused void *arg)
{
struct window *w;
struct window_pane *wp;
struct timeval tv;
u_int i;
if (options_get_number(&global_s_options, "lock-server"))
server_lock_server();
else
server_lock_sessions();
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
w = ARRAY_ITEM(&windows, i);
if (w == NULL)
continue;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (wp->mode != NULL && wp->mode->timer != NULL)
wp->mode->timer(wp);
}
}
server_client_status_timer();
evtimer_del(&server_ev_second);
memset(&tv, 0, sizeof tv);
tv.tv_sec = 1;
evtimer_add(&server_ev_second, &tv);
}
/* Lock the server if ALL sessions have hit the time limit. */
void
server_lock_server(void)
{
struct session *s;
int timeout;
time_t t;
t = time(NULL);
RB_FOREACH(s, sessions, &sessions) {
if (s->flags & SESSION_UNATTACHED)
continue;
timeout = options_get_number(&s->options, "lock-after-time");
if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
return; /* not timed out */
}
server_lock();
recalculate_sizes();
}
/* Lock any sessions which have timed out. */
void
server_lock_sessions(void)
{
struct session *s;
int timeout;
time_t t;
t = time(NULL);
RB_FOREACH(s, sessions, &sessions) {
if (s->flags & SESSION_UNATTACHED)
continue;
timeout = options_get_number(&s->options, "lock-after-time");
if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
server_lock_session(s);
recalculate_sizes();
}
}
}
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