mirror of
https://github.com/tmux/tmux.git
synced 2024-12-13 01:48:47 +00:00
fc118e13a9
it explicitly removes any S_ISUID|S_ISGID|S_ISTXT bits, instead of letting pledge(2) silenciously remove them. ok nicm@ beck@ deraadt@
423 lines
8.5 KiB
C
423 lines
8.5 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <event.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <time.h>
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#include <unistd.h>
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#include "tmux.h"
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/*
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* Main server functions.
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*/
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struct clients clients;
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struct tmuxproc *server_proc;
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int server_fd;
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int server_exit;
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struct event server_ev_accept;
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struct cmd_find_state marked_pane;
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int server_create_socket(void);
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int server_loop(void);
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int server_should_exit(void);
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void server_send_exit(void);
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void server_accept(int, short, void *);
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void server_signal(int);
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void server_child_signal(void);
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void server_child_exited(pid_t, int);
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void server_child_stopped(pid_t, int);
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/* Set marked pane. */
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void
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server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
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{
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cmd_find_clear_state(&marked_pane, NULL, 0);
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marked_pane.s = s;
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marked_pane.wl = wl;
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marked_pane.w = wl->window;
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marked_pane.wp = wp;
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}
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/* Clear marked pane. */
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void
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server_clear_marked(void)
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{
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cmd_find_clear_state(&marked_pane, NULL, 0);
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}
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/* Is this the marked pane? */
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int
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server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
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{
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if (s == NULL || wl == NULL || wp == NULL)
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return (0);
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if (marked_pane.s != s || marked_pane.wl != wl)
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return (0);
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if (marked_pane.wp != wp)
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return (0);
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return (server_check_marked());
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}
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/* Check if the marked pane is still valid. */
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int
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server_check_marked(void)
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{
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return (cmd_find_valid_state(&marked_pane));
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}
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/* Create server socket. */
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int
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server_create_socket(void)
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{
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struct sockaddr_un sa;
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size_t size;
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mode_t mask;
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int fd;
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memset(&sa, 0, sizeof sa);
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sa.sun_family = AF_UNIX;
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size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
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if (size >= sizeof sa.sun_path) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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unlink(sa.sun_path);
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
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return (-1);
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mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
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if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1)
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return (-1);
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umask(mask);
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if (listen(fd, 128) == -1)
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return (-1);
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setblocking(fd, 0);
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return (fd);
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}
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/* Fork new server. */
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int
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server_start(struct event_base *base, int lockfd, char *lockfile)
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{
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int pair[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
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fatal("socketpair failed");
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server_proc = proc_start("server", base, 1, server_signal);
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if (server_proc == NULL) {
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close(pair[1]);
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return (pair[0]);
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}
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close(pair[0]);
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if (log_get_level() > 3)
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tty_create_log();
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if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
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"tty ps", NULL) != 0)
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fatal("pledge failed");
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RB_INIT(&windows);
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RB_INIT(&all_window_panes);
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TAILQ_INIT(&clients);
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RB_INIT(&sessions);
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TAILQ_INIT(&session_groups);
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mode_key_init_trees();
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key_bindings_init();
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gettimeofday(&start_time, NULL);
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server_fd = server_create_socket();
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if (server_fd == -1)
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fatal("couldn't create socket");
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server_update_socket();
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server_client_create(pair[1]);
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if (lockfd >= 0) {
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unlink(lockfile);
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free(lockfile);
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close(lockfd);
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}
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start_cfg();
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status_prompt_load_history();
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server_add_accept(0);
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proc_loop(server_proc, server_loop);
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status_prompt_save_history();
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exit(0);
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}
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/* Server loop callback. */
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int
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server_loop(void)
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{
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struct client *c;
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server_client_loop();
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if (!options_get_number(global_options, "exit-unattached")) {
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if (!RB_EMPTY(&sessions))
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return (0);
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}
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TAILQ_FOREACH(c, &clients, entry) {
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if (c->session != NULL)
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return (0);
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}
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/*
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* No attached clients therefore want to exit - flush any waiting
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* clients but don't actually exit until they've gone.
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*/
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cmd_wait_for_flush();
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if (!TAILQ_EMPTY(&clients))
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return (0);
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return (1);
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}
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/* Exit the server by killing all clients and windows. */
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void
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server_send_exit(void)
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{
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struct client *c, *c1;
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struct session *s, *s1;
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cmd_wait_for_flush();
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TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
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if (c->flags & CLIENT_SUSPENDED)
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server_client_lost(c);
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else
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proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
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c->session = NULL;
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}
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RB_FOREACH_SAFE(s, sessions, &sessions, s1)
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session_destroy(s);
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}
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/* Update socket execute permissions based on whether sessions are attached. */
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void
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server_update_socket(void)
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{
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struct session *s;
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static int last = -1;
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int n, mode;
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struct stat sb;
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n = 0;
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RB_FOREACH(s, sessions, &sessions) {
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if (!(s->flags & SESSION_UNATTACHED)) {
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n++;
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break;
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}
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}
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if (n != last) {
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last = n;
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if (stat(socket_path, &sb) != 0)
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return;
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mode = sb.st_mode & ACCESSPERMS;
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if (n != 0) {
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if (mode & S_IRUSR)
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mode |= S_IXUSR;
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if (mode & S_IRGRP)
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mode |= S_IXGRP;
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if (mode & S_IROTH)
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mode |= S_IXOTH;
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} else
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mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
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chmod(socket_path, mode);
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}
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}
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/* Callback for server socket. */
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void
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server_accept(int fd, short events, __unused void *data)
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{
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struct sockaddr_storage sa;
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socklen_t slen = sizeof sa;
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int newfd;
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server_add_accept(0);
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if (!(events & EV_READ))
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return;
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newfd = accept(fd, (struct sockaddr *) &sa, &slen);
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if (newfd == -1) {
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if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
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return;
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if (errno == ENFILE || errno == EMFILE) {
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/* Delete and don't try again for 1 second. */
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server_add_accept(1);
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return;
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}
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fatal("accept failed");
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}
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if (server_exit) {
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close(newfd);
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return;
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}
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server_client_create(newfd);
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}
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/*
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* Add accept event. If timeout is nonzero, add as a timeout instead of a read
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* event - used to backoff when running out of file descriptors.
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*/
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void
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server_add_accept(int timeout)
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{
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struct timeval tv = { timeout, 0 };
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if (event_initialized(&server_ev_accept))
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event_del(&server_ev_accept);
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if (timeout == 0) {
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event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
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NULL);
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event_add(&server_ev_accept, NULL);
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} else {
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event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
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server_accept, NULL);
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event_add(&server_ev_accept, &tv);
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}
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}
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/* Signal handler. */
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void
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server_signal(int sig)
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{
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int fd;
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switch (sig) {
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case SIGTERM:
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server_exit = 1;
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server_send_exit();
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break;
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case SIGCHLD:
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server_child_signal();
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break;
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case SIGUSR1:
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event_del(&server_ev_accept);
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fd = server_create_socket();
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if (fd != -1) {
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close(server_fd);
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server_fd = fd;
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server_update_socket();
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}
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server_add_accept(0);
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break;
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}
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}
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/* Handle SIGCHLD. */
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void
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server_child_signal(void)
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{
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int status;
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pid_t pid;
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for (;;) {
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switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
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case -1:
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if (errno == ECHILD)
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return;
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fatal("waitpid failed");
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case 0:
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return;
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}
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if (WIFSTOPPED(status))
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server_child_stopped(pid, status);
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else if (WIFEXITED(status) || WIFSIGNALED(status))
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server_child_exited(pid, status);
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}
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}
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/* Handle exited children. */
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void
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server_child_exited(pid_t pid, int status)
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{
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struct window *w, *w1;
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struct window_pane *wp;
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struct job *job;
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RB_FOREACH_SAFE(w, windows, &windows, w1) {
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TAILQ_FOREACH(wp, &w->panes, entry) {
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if (wp->pid == pid) {
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wp->status = status;
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server_destroy_pane(wp, 1);
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break;
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}
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}
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}
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LIST_FOREACH(job, &all_jobs, lentry) {
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if (pid == job->pid) {
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job_died(job, status); /* might free job */
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break;
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}
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}
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}
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/* Handle stopped children. */
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void
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server_child_stopped(pid_t pid, int status)
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{
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struct window *w;
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struct window_pane *wp;
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if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
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return;
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RB_FOREACH(w, windows, &windows) {
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TAILQ_FOREACH(wp, &w->panes, entry) {
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if (wp->pid == pid) {
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if (killpg(pid, SIGCONT) != 0)
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kill(pid, SIGCONT);
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}
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}
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}
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}
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