Adding upstream version 3.3a.upstream/3.3aupstream

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

1 files changed, 392 insertions, 0 deletions

diff --git a/proc.c b/proc.c
new file mode 100644
index 0000000..67ec214
--- /dev/null
+++ b/proc.c
@@ -0,0 +1,392 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2015 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/socket.h>
+#include <sys/uio.h>
+#include <sys/utsname.h>
+
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#if defined(HAVE_NCURSES_H)
+#include <ncurses.h>
+#endif
+
+#include "tmux.h"
+
+struct tmuxproc {
+	const char	 *name;
+	int		  exit;
+
+	void		(*signalcb)(int);
+
+	struct event	  ev_sigint;
+	struct event	  ev_sighup;
+	struct event	  ev_sigchld;
+	struct event	  ev_sigcont;
+	struct event	  ev_sigterm;
+	struct event	  ev_sigusr1;
+	struct event	  ev_sigusr2;
+	struct event	  ev_sigwinch;
+
+	TAILQ_HEAD(, tmuxpeer) peers;
+};
+
+struct tmuxpeer {
+	struct tmuxproc	*parent;
+
+	struct imsgbuf	 ibuf;
+	struct event	 event;
+	uid_t		 uid;
+
+	int		 flags;
+#define PEER_BAD 0x1
+
+	void		(*dispatchcb)(struct imsg *, void *);
+	void		 *arg;
+
+	TAILQ_ENTRY(tmuxpeer) entry;
+};
+
+static int	peer_check_version(struct tmuxpeer *, struct imsg *);
+static void	proc_update_event(struct tmuxpeer *);
+
+static void
+proc_event_cb(__unused int fd, short events, void *arg)
+{
+	struct tmuxpeer	*peer = arg;
+	ssize_t		 n;
+	struct imsg	 imsg;
+
+	if (!(peer->flags & PEER_BAD) && (events & EV_READ)) {
+		if (((n = imsg_read(&peer->ibuf)) == -1 && errno != EAGAIN) ||
+		    n == 0) {
+			peer->dispatchcb(NULL, peer->arg);
+			return;
+		}
+		for (;;) {
+			if ((n = imsg_get(&peer->ibuf, &imsg)) == -1) {
+				peer->dispatchcb(NULL, peer->arg);
+				return;
+			}
+			if (n == 0)
+				break;
+			log_debug("peer %p message %d", peer, imsg.hdr.type);
+
+			if (peer_check_version(peer, &imsg) != 0) {
+				if (imsg.fd != -1)
+					close(imsg.fd);
+				imsg_free(&imsg);
+				break;
+			}
+
+			peer->dispatchcb(&imsg, peer->arg);
+			imsg_free(&imsg);
+		}
+	}
+
+	if (events & EV_WRITE) {
+		if (msgbuf_write(&peer->ibuf.w) <= 0 && errno != EAGAIN) {
+			peer->dispatchcb(NULL, peer->arg);
+			return;
+		}
+	}
+
+	if ((peer->flags & PEER_BAD) && peer->ibuf.w.queued == 0) {
+		peer->dispatchcb(NULL, peer->arg);
+		return;
+	}
+
+	proc_update_event(peer);
+}
+
+static void
+proc_signal_cb(int signo, __unused short events, void *arg)
+{
+	struct tmuxproc	*tp = arg;
+
+	tp->signalcb(signo);
+}
+
+static int
+peer_check_version(struct tmuxpeer *peer, struct imsg *imsg)
+{
+	int	version;
+
+	version = imsg->hdr.peerid & 0xff;
+	if (imsg->hdr.type != MSG_VERSION && version != PROTOCOL_VERSION) {
+		log_debug("peer %p bad version %d", peer, version);
+
+		proc_send(peer, MSG_VERSION, -1, NULL, 0);
+		peer->flags |= PEER_BAD;
+
+		return (-1);
+	}
+	return (0);
+}
+
+static void
+proc_update_event(struct tmuxpeer *peer)
+{
+	short	events;
+
+	event_del(&peer->event);
+
+	events = EV_READ;
+	if (peer->ibuf.w.queued > 0)
+		events |= EV_WRITE;
+	event_set(&peer->event, peer->ibuf.fd, events, proc_event_cb, peer);
+
+	event_add(&peer->event, NULL);
+}
+
+int
+proc_send(struct tmuxpeer *peer, enum msgtype type, int fd, const void *buf,
+    size_t len)
+{
+	struct imsgbuf	*ibuf = &peer->ibuf;
+	void		*vp = (void *)buf;
+	int		 retval;
+
+	if (peer->flags & PEER_BAD)
+		return (-1);
+	log_debug("sending message %d to peer %p (%zu bytes)", type, peer, len);
+
+	retval = imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, fd, vp, len);
+	if (retval != 1)
+		return (-1);
+	proc_update_event(peer);
+	return (0);
+}
+
+struct tmuxproc *
+proc_start(const char *name)
+{
+	struct tmuxproc	*tp;
+	struct utsname	 u;
+
+	log_open(name);
+	setproctitle("%s (%s)", name, socket_path);
+
+	if (uname(&u) < 0)
+		memset(&u, 0, sizeof u);
+
+	log_debug("%s started (%ld): version %s, socket %s, protocol %d", name,
+	    (long)getpid(), getversion(), socket_path, PROTOCOL_VERSION);
+	log_debug("on %s %s %s", u.sysname, u.release, u.version);
+	log_debug("using libevent %s (%s)"
+#ifdef HAVE_UTF8PROC
+	    "; utf8proc %s"
+#endif
+#ifdef NCURSES_VERSION
+	    "; ncurses " NCURSES_VERSION
+#endif
+	    , event_get_version(), event_get_method()
+#ifdef HAVE_UTF8PROC
+	    , utf8proc_version()
+#endif
+	);
+
+	tp = xcalloc(1, sizeof *tp);
+	tp->name = xstrdup(name);
+	TAILQ_INIT(&tp->peers);
+
+	return (tp);
+}
+
+void
+proc_loop(struct tmuxproc *tp, int (*loopcb)(void))
+{
+	log_debug("%s loop enter", tp->name);
+	do
+		event_loop(EVLOOP_ONCE);
+	while (!tp->exit && (loopcb == NULL || !loopcb ()));
+	log_debug("%s loop exit", tp->name);
+}
+
+void
+proc_exit(struct tmuxproc *tp)
+{
+	struct tmuxpeer	*peer;
+
+	TAILQ_FOREACH(peer, &tp->peers, entry)
+	    imsg_flush(&peer->ibuf);
+	tp->exit = 1;
+}
+
+void
+proc_set_signals(struct tmuxproc *tp, void (*signalcb)(int))
+{
+	struct sigaction	sa;
+
+	tp->signalcb = signalcb;
+
+	memset(&sa, 0, sizeof sa);
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = SA_RESTART;
+	sa.sa_handler = SIG_IGN;
+
+	sigaction(SIGPIPE, &sa, NULL);
+	sigaction(SIGTSTP, &sa, NULL);
+	sigaction(SIGTTIN, &sa, NULL);
+	sigaction(SIGTTOU, &sa, NULL);
+	sigaction(SIGQUIT, &sa, NULL);
+
+	signal_set(&tp->ev_sigint, SIGINT, proc_signal_cb, tp);
+	signal_add(&tp->ev_sigint, NULL);
+	signal_set(&tp->ev_sighup, SIGHUP, proc_signal_cb, tp);
+	signal_add(&tp->ev_sighup, NULL);
+	signal_set(&tp->ev_sigchld, SIGCHLD, proc_signal_cb, tp);
+	signal_add(&tp->ev_sigchld, NULL);
+	signal_set(&tp->ev_sigcont, SIGCONT, proc_signal_cb, tp);
+	signal_add(&tp->ev_sigcont, NULL);
+	signal_set(&tp->ev_sigterm, SIGTERM, proc_signal_cb, tp);
+	signal_add(&tp->ev_sigterm, NULL);
+	signal_set(&tp->ev_sigusr1, SIGUSR1, proc_signal_cb, tp);
+	signal_add(&tp->ev_sigusr1, NULL);
+	signal_set(&tp->ev_sigusr2, SIGUSR2, proc_signal_cb, tp);
+	signal_add(&tp->ev_sigusr2, NULL);
+	signal_set(&tp->ev_sigwinch, SIGWINCH, proc_signal_cb, tp);
+	signal_add(&tp->ev_sigwinch, NULL);
+}
+
+void
+proc_clear_signals(struct tmuxproc *tp, int defaults)
+{
+	struct sigaction	sa;
+
+	memset(&sa, 0, sizeof sa);
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = SA_RESTART;
+	sa.sa_handler = SIG_DFL;
+
+	sigaction(SIGPIPE, &sa, NULL);
+	sigaction(SIGTSTP, &sa, NULL);
+
+	signal_del(&tp->ev_sigint);
+	signal_del(&tp->ev_sighup);
+	signal_del(&tp->ev_sigchld);
+	signal_del(&tp->ev_sigcont);
+	signal_del(&tp->ev_sigterm);
+	signal_del(&tp->ev_sigusr1);
+	signal_del(&tp->ev_sigusr2);
+	signal_del(&tp->ev_sigwinch);
+
+	if (defaults) {
+		sigaction(SIGINT, &sa, NULL);
+		sigaction(SIGQUIT, &sa, NULL);
+		sigaction(SIGHUP, &sa, NULL);
+		sigaction(SIGCHLD, &sa, NULL);
+		sigaction(SIGCONT, &sa, NULL);
+		sigaction(SIGTERM, &sa, NULL);
+		sigaction(SIGUSR1, &sa, NULL);
+		sigaction(SIGUSR2, &sa, NULL);
+		sigaction(SIGWINCH, &sa, NULL);
+	}
+}
+
+struct tmuxpeer *
+proc_add_peer(struct tmuxproc *tp, int fd,
+    void (*dispatchcb)(struct imsg *, void *), void *arg)
+{
+	struct tmuxpeer	*peer;
+	gid_t		 gid;
+
+	peer = xcalloc(1, sizeof *peer);
+	peer->parent = tp;
+
+	peer->dispatchcb = dispatchcb;
+	peer->arg = arg;
+
+	imsg_init(&peer->ibuf, fd);
+	event_set(&peer->event, fd, EV_READ, proc_event_cb, peer);
+
+	if (getpeereid(fd, &peer->uid, &gid) != 0)
+		peer->uid = (uid_t)-1;
+
+	log_debug("add peer %p: %d (%p)", peer, fd, arg);
+	TAILQ_INSERT_TAIL(&tp->peers, peer, entry);
+
+	proc_update_event(peer);
+	return (peer);
+}
+
+void
+proc_remove_peer(struct tmuxpeer *peer)
+{
+	TAILQ_REMOVE(&peer->parent->peers, peer, entry);
+	log_debug("remove peer %p", peer);
+
+	event_del(&peer->event);
+	imsg_clear(&peer->ibuf);
+
+	close(peer->ibuf.fd);
+	free(peer);
+}
+
+void
+proc_kill_peer(struct tmuxpeer *peer)
+{
+	peer->flags |= PEER_BAD;
+}
+
+void
+proc_flush_peer(struct tmuxpeer *peer)
+{
+	imsg_flush(&peer->ibuf);
+}
+
+void
+proc_toggle_log(struct tmuxproc *tp)
+{
+	log_toggle(tp->name);
+}
+
+pid_t
+proc_fork_and_daemon(int *fd)
+{
+	pid_t	pid;
+	int	pair[2];
+
+	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
+		fatal("socketpair failed");
+	switch (pid = fork()) {
+	case -1:
+		fatal("fork failed");
+	case 0:
+		close(pair[0]);
+		*fd = pair[1];
+		if (daemon(1, 0) != 0)
+			fatal("daemon failed");
+		return (0);
+	default:
+		close(pair[1]);
+		*fd = pair[0];
+		return (pid);
+	}
+}
+
+uid_t
+proc_get_peer_uid(struct tmuxpeer *peer)
+{
+	return (peer->uid);
+}