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/* $Id: server.c,v 1.16 2007-09-29 09:53:25 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 <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <unistd.h>
#include <util.h>
#include "tmux.h"
/*
* Main server functions.
*/
/* Client list. */
struct clients clients;
int server_main(char *, int);
void server_fill_windows(struct pollfd **);
void server_handle_windows(struct pollfd **);
void server_fill_clients(struct pollfd **);
void server_handle_clients(struct pollfd **);
struct client *server_accept_client(int);
void server_handle_window(struct window *);
void server_lost_client(struct client *);
void server_lost_window(struct window *);
/* Fork new server. */
int
server_start(char *path)
{
struct sockaddr_un sa;
size_t sz;
pid_t pid;
mode_t mask;
int fd, mode;
switch (pid = fork()) {
case -1:
log_warn("fork");
return (-1);
case 0:
break;
default:
return (0);
}
logfile("server");
setproctitle("server (%s)", path);
log_debug("server started, pid %ld", (long) getpid());
memset(&sa, 0, sizeof sa);
sa.sun_family = AF_UNIX;
sz = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
if (sz >= 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_IRWXG|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");
if ((mode = fcntl(fd, F_GETFL)) == -1)
fatal("fcntl failed");
if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
fatal("fcntl failed");
/*
* Detach into the background. This means the PID changes which will
* have to be fixed in some way at some point... XXX
*/
if (daemon(1, 1) != 0)
fatal("daemon failed");
log_debug("server daemonised, pid now %ld", (long) getpid());
exit(server_main(path, fd));
}
/* Main server loop. */
int
server_main(char *srv_path, int srv_fd)
{
struct pollfd *pfds, *pfd;
int nfds;
siginit();
ARRAY_INIT(&windows);
ARRAY_INIT(&clients);
ARRAY_INIT(&sessions);
pfds = NULL;
while (!sigterm) {
/* Initialise pollfd array. */
nfds = 1 + ARRAY_LENGTH(&windows) + ARRAY_LENGTH(&clients);
pfds = xrealloc(pfds, nfds, sizeof *pfds);
pfd = pfds;
/* Fill server socket. */
pfd->fd = srv_fd;
pfd->events = POLLIN;
pfd++;
/* Fill window and client sockets. */
server_fill_windows(&pfd);
server_fill_clients(&pfd);
/* Do the poll. */
if (poll(pfds, nfds, INFTIM) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
pfd = pfds;
/* Handle server socket. */
if (pfd->revents & (POLLERR|POLLNVAL|POLLHUP))
fatalx("lost server socket");
if (pfd->revents & POLLIN) {
server_accept_client(srv_fd);
continue;
}
pfd++;
/*
* Handle window and client sockets. Clients can create
* windows, so windows must come first to avoid messing up by
* increasing the array size.
*/
server_handle_windows(&pfd);
server_handle_clients(&pfd);
}
close(srv_fd);
unlink(srv_path);
return (0);
}
/* Fill window pollfds. */
void
server_fill_windows(struct pollfd **pfd)
{
struct window *w;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
if ((w = ARRAY_ITEM(&windows, i)) == NULL)
(*pfd)->fd = -1;
else {
(*pfd)->fd = w->fd;
(*pfd)->events = POLLIN;
if (BUFFER_USED(w->out) > 0)
(*pfd)->events |= POLLOUT;
}
(*pfd)++;
}
}
/* Handle window pollfds. */
void
server_handle_windows(struct pollfd **pfd)
{
struct window *w;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
if ((w = ARRAY_ITEM(&windows, i)) != NULL) {
if (window_poll(w, *pfd) != 0)
server_lost_window(w);
else
server_handle_window(w);
}
(*pfd)++;
}
}
/* Fill client pollfds. */
void
server_fill_clients(struct pollfd **pfd)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if ((c = ARRAY_ITEM(&clients, i)) == NULL)
(*pfd)->fd = -1;
else {
(*pfd)->fd = c->fd;
(*pfd)->events = POLLIN;
if (BUFFER_USED(c->out) > 0)
(*pfd)->events |= POLLOUT;
}
(*pfd)++;
}
}
/* Handle client pollfds. */
void
server_handle_clients(struct pollfd *(*pfd))
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if ((c = ARRAY_ITEM(&clients, i)) != NULL) {
if (buffer_poll((*pfd), c->in, c->out) != 0)
server_lost_client(c);
else
server_msg_dispatch(c);
}
(*pfd)++;
}
}
/* accept(2) and create new client. */
struct client *
server_accept_client(int srv_fd)
{
struct client *c;
struct sockaddr_storage sa;
socklen_t slen = sizeof sa;
int client_fd, mode;
u_int i;
client_fd = accept(srv_fd, (struct sockaddr *) &sa, &slen);
if (client_fd == -1) {
if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
return (NULL);
fatal("accept failed");
}
if ((mode = fcntl(client_fd, F_GETFL)) == -1)
fatal("fcntl failed");
if (fcntl(client_fd, F_SETFL, mode|O_NONBLOCK) == -1)
fatal("fcntl failed");
c = xmalloc(sizeof *c);
c->fd = client_fd;
c->in = buffer_create(BUFSIZ);
c->out = buffer_create(BUFSIZ);
c->session = NULL;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) == NULL) {
ARRAY_SET(&clients, i, c);
return (c);
}
}
ARRAY_ADD(&clients, c);
return (c);
}
/* Lost a client. */
void
server_lost_client(struct client *c)
{
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if (ARRAY_ITEM(&clients, i) == c)
ARRAY_SET(&clients, i, NULL);
}
close(c->fd);
buffer_destroy(c->in);
buffer_destroy(c->out);
xfree(c);
}
/* Handle window data. */
void
server_handle_window(struct window *w)
{
struct client *c;
struct session *s;
struct buffer *b;
u_int i, j, p;
b = buffer_create(BUFSIZ);
window_output(w, b);
if (BUFFER_USED(b) != 0) {
server_write_clients(
w, MSG_OUTPUT, BUFFER_OUT(b), BUFFER_USED(b));
}
buffer_destroy(b);
if (!(w->flags & WINDOW_BELL))
return;
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
s = ARRAY_ITEM(&sessions, i);
if (s == NULL)
continue;
if (window_index(&s->windows, w, &p) != 0)
continue;
for (j = 0; j < ARRAY_LENGTH(&clients); j++) {
c = ARRAY_ITEM(&clients, j);
if (c == NULL || c->session != s)
continue;
/*
if (s->window != w)
server_write_message(c, "Bell in window %u", p);
*/
server_write_client(c, MSG_OUTPUT, "\007", 1);
}
}
w->flags &= ~WINDOW_BELL;
}
/* Lost window: move clients on to next window. */
void
server_lost_window(struct window *w)
{
struct client *c;
struct session *s;
u_int i, j;
int destroyed;
log_debug("lost window %d", w->fd);
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
s = ARRAY_ITEM(&sessions, i);
if (s == NULL)
continue;
if (!session_has(s, w))
continue;
/* Detach window and either redraw or kill clients. */
destroyed = session_detach(s, w);
for (j = 0; j < ARRAY_LENGTH(&clients); j++) {
c = ARRAY_ITEM(&clients, j);
if (c == NULL || c->session != s)
continue;
if (destroyed) {
c->session = NULL;
server_write_client(c, MSG_EXIT, NULL, 0);
} else
server_window_changed(c);
}
}
}