Adding upstream version 3.3a.upstream/3.3a

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 554 insertions, 0 deletions

diff --git a/server.c b/server.c
new file mode 100644
index 0000000..05bc50f
--- /dev/null
+++ b/server.c
@@ -0,0 +1,554 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
+ *
+ * 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 <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "tmux.h"
+
+/*
+ * Main server functions.
+ */
+
+struct clients		 clients;
+
+struct tmuxproc		*server_proc;
+static int		 server_fd = -1;
+static uint64_t		 server_client_flags;
+static int		 server_exit;
+static struct event	 server_ev_accept;
+static struct event	 server_ev_tidy;
+
+struct cmd_find_state	 marked_pane;
+
+static u_int		 message_next;
+struct message_list	 message_log;
+
+static int	server_loop(void);
+static void	server_send_exit(void);
+static void	server_accept(int, short, void *);
+static void	server_signal(int);
+static void	server_child_signal(void);
+static void	server_child_exited(pid_t, int);
+static void	server_child_stopped(pid_t, int);
+
+/* Set marked pane. */
+void
+server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
+{
+	cmd_find_clear_state(&marked_pane, 0);
+	marked_pane.s = s;
+	marked_pane.wl = wl;
+	marked_pane.w = wl->window;
+	marked_pane.wp = wp;
+}
+
+/* Clear marked pane. */
+void
+server_clear_marked(void)
+{
+	cmd_find_clear_state(&marked_pane, 0);
+}
+
+/* Is this the marked pane? */
+int
+server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
+{
+	if (s == NULL || wl == NULL || wp == NULL)
+		return (0);
+	if (marked_pane.s != s || marked_pane.wl != wl)
+		return (0);
+	if (marked_pane.wp != wp)
+		return (0);
+	return (server_check_marked());
+}
+
+/* Check if the marked pane is still valid. */
+int
+server_check_marked(void)
+{
+	return (cmd_find_valid_state(&marked_pane));
+}
+
+/* Create server socket. */
+int
+server_create_socket(int flags, char **cause)
+{
+	struct sockaddr_un	sa;
+	size_t			size;
+	mode_t			mask;
+	int			fd, saved_errno;
+
+	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;
+		goto fail;
+	}
+	unlink(sa.sun_path);
+
+	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
+		goto fail;
+
+	if (flags & CLIENT_DEFAULTSOCKET)
+		mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
+	else
+		mask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
+	if (bind(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
+		saved_errno = errno;
+		close(fd);
+		errno = saved_errno;
+		goto fail;
+	}
+	umask(mask);
+
+	if (listen(fd, 128) == -1) {
+		saved_errno = errno;
+		close(fd);
+		errno = saved_errno;
+		goto fail;
+	}
+	setblocking(fd, 0);
+
+	return (fd);
+
+fail:
+	if (cause != NULL) {
+		xasprintf(cause, "error creating %s (%s)", socket_path,
+		    strerror(errno));
+	}
+	return (-1);
+}
+
+/* Tidy up every hour. */
+static void
+server_tidy_event(__unused int fd, __unused short events, __unused void *data)
+{
+    struct timeval	tv = { .tv_sec = 3600 };
+    uint64_t		t = get_timer();
+
+    format_tidy_jobs();
+
+#ifdef HAVE_MALLOC_TRIM
+    malloc_trim(0);
+#endif
+
+    log_debug("%s: took %llu milliseconds", __func__,
+        (unsigned long long)(get_timer() - t));
+    evtimer_add(&server_ev_tidy, &tv);
+}
+
+/* Fork new server. */
+int
+server_start(struct tmuxproc *client, int flags, struct event_base *base,
+    int lockfd, char *lockfile)
+{
+	int		 fd;
+	sigset_t	 set, oldset;
+	struct client	*c = NULL;
+	char		*cause = NULL;
+	struct timeval	 tv = { .tv_sec = 3600 };
+
+	sigfillset(&set);
+	sigprocmask(SIG_BLOCK, &set, &oldset);
+
+	if (~flags & CLIENT_NOFORK) {
+		if (proc_fork_and_daemon(&fd) != 0) {
+			sigprocmask(SIG_SETMASK, &oldset, NULL);
+			return (fd);
+		}
+	}
+	proc_clear_signals(client, 0);
+	server_client_flags = flags;
+
+	if (event_reinit(base) != 0)
+		fatalx("event_reinit failed");
+	server_proc = proc_start("server");
+
+	proc_set_signals(server_proc, server_signal);
+	sigprocmask(SIG_SETMASK, &oldset, NULL);
+
+	if (log_get_level() > 1)
+		tty_create_log();
+	if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
+	    "tty ps", NULL) != 0)
+		fatal("pledge failed");
+
+	input_key_build();
+	RB_INIT(&windows);
+	RB_INIT(&all_window_panes);
+	TAILQ_INIT(&clients);
+	RB_INIT(&sessions);
+	key_bindings_init();
+	TAILQ_INIT(&message_log);
+
+	gettimeofday(&start_time, NULL);
+
+#ifdef HAVE_SYSTEMD
+	server_fd = systemd_create_socket(flags, &cause);
+#else
+	server_fd = server_create_socket(flags, &cause);
+#endif
+	if (server_fd != -1)
+		server_update_socket();
+	if (~flags & CLIENT_NOFORK)
+		c = server_client_create(fd);
+	else
+		options_set_number(global_options, "exit-empty", 0);
+
+	if (lockfd >= 0) {
+		unlink(lockfile);
+		free(lockfile);
+		close(lockfd);
+	}
+
+	if (cause != NULL) {
+		if (c != NULL) {
+			c->exit_message = cause;
+			c->flags |= CLIENT_EXIT;
+		} else {
+			fprintf(stderr, "%s\n", cause);
+			exit(1);
+		}
+	}
+
+	evtimer_set(&server_ev_tidy, server_tidy_event, NULL);
+	evtimer_add(&server_ev_tidy, &tv);
+
+	server_acl_init();
+
+	server_add_accept(0);
+	proc_loop(server_proc, server_loop);
+
+	job_kill_all();
+	status_prompt_save_history();
+
+	exit(0);
+}
+
+/* Server loop callback. */
+static int
+server_loop(void)
+{
+	struct client	*c;
+	u_int		 items;
+
+	do {
+		items = cmdq_next(NULL);
+		TAILQ_FOREACH(c, &clients, entry) {
+			if (c->flags & CLIENT_IDENTIFIED)
+				items += cmdq_next(c);
+		}
+	} while (items != 0);
+
+	server_client_loop();
+
+	if (!options_get_number(global_options, "exit-empty") && !server_exit)
+		return (0);
+
+	if (!options_get_number(global_options, "exit-unattached")) {
+		if (!RB_EMPTY(&sessions))
+			return (0);
+	}
+
+	TAILQ_FOREACH(c, &clients, entry) {
+		if (c->session != NULL)
+			return (0);
+	}
+
+	/*
+	 * No attached clients therefore want to exit - flush any waiting
+	 * clients but don't actually exit until they've gone.
+	 */
+	cmd_wait_for_flush();
+	if (!TAILQ_EMPTY(&clients))
+		return (0);
+
+	if (job_still_running())
+		return (0);
+
+	return (1);
+}
+
+/* Exit the server by killing all clients and windows. */
+static void
+server_send_exit(void)
+{
+	struct client	*c, *c1;
+	struct session	*s, *s1;
+
+	cmd_wait_for_flush();
+
+	TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
+		if (c->flags & CLIENT_SUSPENDED)
+			server_client_lost(c);
+		else {
+			c->flags |= CLIENT_EXIT;
+			c->exit_type = CLIENT_EXIT_SHUTDOWN;
+		}
+		c->session = NULL;
+	}
+
+	RB_FOREACH_SAFE(s, sessions, &sessions, s1)
+		session_destroy(s, 1, __func__);
+}
+
+/* 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->attached != 0) {
+			n++;
+			break;
+		}
+	}
+
+	if (n != last) {
+		last = n;
+
+		if (stat(socket_path, &sb) != 0)
+			return;
+		mode = sb.st_mode & ACCESSPERMS;
+		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. */
+static void
+server_accept(int fd, short events, __unused void *data)
+{
+	struct sockaddr_storage	 sa;
+	socklen_t		 slen = sizeof sa;
+	int			 newfd;
+	struct client		*c;
+
+	server_add_accept(0);
+	if (!(events & EV_READ))
+		return;
+
+	newfd = accept(fd, (struct sockaddr *) &sa, &slen);
+	if (newfd == -1) {
+		if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
+			return;
+		if (errno == ENFILE || errno == EMFILE) {
+			/* Delete and don't try again for 1 second. */
+			server_add_accept(1);
+			return;
+		}
+		fatal("accept failed");
+	}
+
+	if (server_exit) {
+		close(newfd);
+		return;
+	}
+	c = server_client_create(newfd);
+	if (!server_acl_join(c)) {
+		c->exit_message = xstrdup("access not allowed");
+		c->flags |= CLIENT_EXIT;
+	}
+}
+
+/*
+ * Add accept event. If timeout is nonzero, add as a timeout instead of a read
+ * event - used to backoff when running out of file descriptors.
+ */
+void
+server_add_accept(int timeout)
+{
+	struct timeval tv = { timeout, 0 };
+
+	if (server_fd == -1)
+		return;
+
+	if (event_initialized(&server_ev_accept))
+		event_del(&server_ev_accept);
+
+	if (timeout == 0) {
+		event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
+		    NULL);
+		event_add(&server_ev_accept, NULL);
+	} else {
+		event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
+		    server_accept, NULL);
+		event_add(&server_ev_accept, &tv);
+	}
+}
+
+/* Signal handler. */
+static void
+server_signal(int sig)
+{
+	int	fd;
+
+	log_debug("%s: %s", __func__, strsignal(sig));
+	switch (sig) {
+	case SIGINT:
+	case SIGTERM:
+		server_exit = 1;
+		server_send_exit();
+		break;
+	case SIGCHLD:
+		server_child_signal();
+		break;
+	case SIGUSR1:
+		event_del(&server_ev_accept);
+		fd = server_create_socket(server_client_flags, NULL);
+		if (fd != -1) {
+			close(server_fd);
+			server_fd = fd;
+			server_update_socket();
+		}
+		server_add_accept(0);
+		break;
+	case SIGUSR2:
+		proc_toggle_log(server_proc);
+		break;
+	}
+}
+
+/* Handle SIGCHLD. */
+static 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. */
+static void
+server_child_exited(pid_t pid, int status)
+{
+	struct window		*w, *w1;
+	struct window_pane	*wp;
+
+	RB_FOREACH_SAFE(w, windows, &windows, w1) {
+		TAILQ_FOREACH(wp, &w->panes, entry) {
+			if (wp->pid == pid) {
+				wp->status = status;
+				wp->flags |= PANE_STATUSREADY;
+
+				log_debug("%%%u exited", wp->id);
+				wp->flags |= PANE_EXITED;
+
+				if (window_pane_destroy_ready(wp))
+					server_destroy_pane(wp, 1);
+				break;
+			}
+		}
+	}
+	job_check_died(pid, status);
+}
+
+/* Handle stopped children. */
+static void
+server_child_stopped(pid_t pid, int status)
+{
+	struct window		*w;
+	struct window_pane	*wp;
+
+	if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
+		return;
+
+	RB_FOREACH(w, windows, &windows) {
+		TAILQ_FOREACH(wp, &w->panes, entry) {
+			if (wp->pid == pid) {
+				if (killpg(pid, SIGCONT) != 0)
+					kill(pid, SIGCONT);
+			}
+		}
+	}
+	job_check_died(pid, status);
+}
+
+/* Add to message log. */
+void
+server_add_message(const char *fmt, ...)
+{
+	struct message_entry	*msg, *msg1;
+	char			*s;
+	va_list			 ap;
+	u_int			 limit;
+
+	va_start(ap, fmt);
+	xvasprintf(&s, fmt, ap);
+	va_end(ap);
+
+	log_debug("message: %s", s);
+
+	msg = xcalloc(1, sizeof *msg);
+	gettimeofday(&msg->msg_time, NULL);
+	msg->msg_num = message_next++;
+	msg->msg = s;
+	TAILQ_INSERT_TAIL(&message_log, msg, entry);
+
+	limit = options_get_number(global_options, "message-limit");
+	TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) {
+		if (msg->msg_num + limit >= message_next)
+			break;
+		free(msg->msg);
+		TAILQ_REMOVE(&message_log, msg, entry);
+		free(msg);
+	}
+}