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/* $OpenBSD: proc.c,v 1.8 2016/01/19 15:59:12 nicm Exp $ */ |
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/* |
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* Copyright (c) 2015 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/queue.h> |
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#include <sys/uio.h> |
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#include <sys/utsname.h> |
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#include <errno.h> |
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#include <event.h> |
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#include <imsg.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "tmux.h" |
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struct tmuxproc { |
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const char *name; |
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int exit; |
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void (*signalcb)(int); |
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}; |
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struct tmuxpeer { |
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struct tmuxproc *parent; |
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struct imsgbuf ibuf; |
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struct event event; |
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int flags; |
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#define PEER_BAD 0x1 |
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void (*dispatchcb)(struct imsg *, void *); |
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void *arg; |
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}; |
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static int peer_check_version(struct tmuxpeer *, struct imsg *); |
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static void proc_update_event(struct tmuxpeer *); |
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static void |
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proc_event_cb(__unused int fd, short events, void *arg) |
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{ |
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struct tmuxpeer *peer = arg; |
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ssize_t n; |
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struct imsg imsg; |
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if (!(peer->flags & PEER_BAD) && (events & EV_READ)) { |
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if (((n = imsg_read(&peer->ibuf)) == -1 && errno != EAGAIN) || |
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n == 0) { |
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peer->dispatchcb(NULL, peer->arg); |
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return; |
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} |
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for (;;) { |
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if ((n = imsg_get(&peer->ibuf, &imsg)) == -1) { |
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peer->dispatchcb(NULL, peer->arg); |
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return; |
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} |
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if (n == 0) |
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break; |
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log_debug("peer %p message %d", peer, imsg.hdr.type); |
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if (peer_check_version(peer, &imsg) != 0) { |
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if (imsg.fd != -1) |
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close(imsg.fd); |
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imsg_free(&imsg); |
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break; |
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} |
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peer->dispatchcb(&imsg, peer->arg); |
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imsg_free(&imsg); |
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} |
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} |
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if (events & EV_WRITE) { |
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if (msgbuf_write(&peer->ibuf.w) <= 0 && errno != EAGAIN) { |
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peer->dispatchcb(NULL, peer->arg); |
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return; |
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} |
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} |
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if ((peer->flags & PEER_BAD) && peer->ibuf.w.queued == 0) { |
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peer->dispatchcb(NULL, peer->arg); |
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return; |
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} |
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proc_update_event(peer); |
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} |
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static void |
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proc_signal_cb(int signo, __unused short events, void *arg) |
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{ |
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struct tmuxproc *tp = arg; |
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tp->signalcb(signo); |
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} |
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static int |
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peer_check_version(struct tmuxpeer *peer, struct imsg *imsg) |
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{ |
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int version; |
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version = imsg->hdr.peerid & 0xff; |
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if (imsg->hdr.type != MSG_VERSION && version != PROTOCOL_VERSION) { |
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log_debug("peer %p bad version %d", peer, version); |
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proc_send(peer, MSG_VERSION, -1, NULL, 0); |
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peer->flags |= PEER_BAD; |
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return (-1); |
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} |
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return (0); |
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} |
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static void |
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proc_update_event(struct tmuxpeer *peer) |
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{ |
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short events; |
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event_del(&peer->event); |
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events = EV_READ; |
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if (peer->ibuf.w.queued > 0) |
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events |= EV_WRITE; |
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event_set(&peer->event, peer->ibuf.fd, events, proc_event_cb, peer); |
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event_add(&peer->event, NULL); |
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} |
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int |
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proc_send(struct tmuxpeer *peer, enum msgtype type, int fd, const void *buf, |
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size_t len) |
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{ |
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struct imsgbuf *ibuf = &peer->ibuf; |
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void *vp = (void *)buf; |
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int retval; |
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if (peer->flags & PEER_BAD) |
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return (-1); |
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log_debug("sending message %d to peer %p (%zu bytes)", type, peer, len); |
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retval = imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, fd, vp, len); |
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if (retval != 1) |
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return (-1); |
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proc_update_event(peer); |
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return (0); |
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} |
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int |
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proc_send_s(struct tmuxpeer *peer, enum msgtype type, const char *s) |
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{ |
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return (proc_send(peer, type, -1, s, strlen(s) + 1)); |
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} |
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struct tmuxproc * |
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proc_start(const char *name, struct event_base *base, int forkflag, |
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void (*signalcb)(int)) |
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{ |
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struct tmuxproc *tp; |
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struct utsname u; |
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if (forkflag) { |
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switch (fork()) { |
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case -1: |
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fatal("fork failed"); |
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case 0: |
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break; |
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default: |
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return (NULL); |
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} |
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if (daemon(1, 0) != 0) |
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fatal("daemon failed"); |
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clear_signals(0); |
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if (event_reinit(base) != 0) |
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fatalx("event_reinit failed"); |
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} |
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log_open(name); |
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setproctitle("%s (%s)", name, socket_path); |
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if (uname(&u) < 0) |
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memset(&u, 0, sizeof u); |
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log_debug("%s started (%ld): socket %s, protocol %d", name, |
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(long)getpid(), socket_path, PROTOCOL_VERSION); |
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log_debug("on %s %s %s; libevent %s (%s)", u.sysname, u.release, |
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u.version, event_get_version(), event_get_method()); |
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tp = xcalloc(1, sizeof *tp); |
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tp->name = xstrdup(name); |
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tp->signalcb = signalcb; |
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set_signals(proc_signal_cb, tp); |
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return (tp); |
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} |
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void |
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proc_loop(struct tmuxproc *tp, int (*loopcb)(void)) |
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{ |
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log_debug("%s loop enter", tp->name); |
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do |
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event_loop(EVLOOP_ONCE); |
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while (!tp->exit && (loopcb == NULL || !loopcb ())); |
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log_debug("%s loop exit", tp->name); |
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} |
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void |
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proc_exit(struct tmuxproc *tp) |
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{ |
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tp->exit = 1; |
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} |
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struct tmuxpeer * |
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proc_add_peer(struct tmuxproc *tp, int fd, |
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void (*dispatchcb)(struct imsg *, void *), void *arg) |
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{ |
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struct tmuxpeer *peer; |
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peer = xcalloc(1, sizeof *peer); |
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peer->parent = tp; |
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peer->dispatchcb = dispatchcb; |
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peer->arg = arg; |
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imsg_init(&peer->ibuf, fd); |
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event_set(&peer->event, fd, EV_READ, proc_event_cb, peer); |
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log_debug("add peer %p: %d (%p)", peer, fd, arg); |
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proc_update_event(peer); |
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return (peer); |
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} |
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void |
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proc_remove_peer(struct tmuxpeer *peer) |
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{ |
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log_debug("remove peer %p", peer); |
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event_del(&peer->event); |
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imsg_clear(&peer->ibuf); |
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close(peer->ibuf.fd); |
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free(peer); |
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} |
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void |
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proc_kill_peer(struct tmuxpeer *peer) |
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{ |
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peer->flags |= PEER_BAD; |
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} |