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1.6 ! nicm 1: /* $OpenBSD: proc.c,v 1.5 2015/11/24 21:19:46 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2015 Nicholas Marriott <nicm@users.sourceforge.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20: #include <sys/queue.h>
21: #include <sys/uio.h>
1.6 ! nicm 22: #include <sys/utsname.h>
1.1 nicm 23:
24: #include <errno.h>
25: #include <event.h>
26: #include <imsg.h>
27: #include <stdlib.h>
28: #include <string.h>
29: #include <unistd.h>
30:
31: #include "tmux.h"
32:
33: struct tmuxproc {
34: const char *name;
35: int exit;
36:
37: void (*signalcb)(int);
38: };
39:
40: struct tmuxpeer {
41: struct tmuxproc *parent;
42:
43: struct imsgbuf ibuf;
44: struct event event;
45:
46: int flags;
47: #define PEER_BAD 0x1
48:
49: void (*dispatchcb)(struct imsg *, void *);
50: void *arg;
51: };
52:
1.2 nicm 53: static int peer_check_version(struct tmuxpeer *, struct imsg *);
54: static void proc_update_event(struct tmuxpeer *);
1.1 nicm 55:
56: static void
1.4 nicm 57: proc_event_cb(__unused int fd, short events, void *arg)
1.1 nicm 58: {
59: struct tmuxpeer *peer = arg;
60: ssize_t n;
61: struct imsg imsg;
62:
63: if (!(peer->flags & PEER_BAD) && (events & EV_READ)) {
64: if ((n = imsg_read(&peer->ibuf)) == -1 || n == 0) {
65: peer->dispatchcb(NULL, peer->arg);
66: return;
67: }
68: for (;;) {
69: if ((n = imsg_get(&peer->ibuf, &imsg)) == -1) {
70: peer->dispatchcb(NULL, peer->arg);
71: return;
72: }
73: if (n == 0)
74: break;
75: log_debug("peer %p message %d", peer, imsg.hdr.type);
76:
1.2 nicm 77: if (peer_check_version(peer, &imsg) != 0) {
1.1 nicm 78: if (imsg.fd != -1)
79: close(imsg.fd);
80: imsg_free(&imsg);
81: break;
82: }
83:
84: peer->dispatchcb(&imsg, peer->arg);
85: imsg_free(&imsg);
86: }
87: }
88:
89: if (events & EV_WRITE) {
90: if (msgbuf_write(&peer->ibuf.w) <= 0 && errno != EAGAIN) {
91: peer->dispatchcb(NULL, peer->arg);
92: return;
93: }
94: }
95:
96: if ((peer->flags & PEER_BAD) && peer->ibuf.w.queued == 0) {
97: peer->dispatchcb(NULL, peer->arg);
98: return;
99: }
100:
101: proc_update_event(peer);
102: }
103:
104: static void
1.4 nicm 105: proc_signal_cb(int signo, __unused short events, void *arg)
1.1 nicm 106: {
107: struct tmuxproc *tp = arg;
108:
109: tp->signalcb(signo);
1.2 nicm 110: }
111:
112: static int
113: peer_check_version(struct tmuxpeer *peer, struct imsg *imsg)
114: {
115: int version;
116:
117: version = imsg->hdr.peerid & 0xff;
118: if (imsg->hdr.type != MSG_VERSION && version != PROTOCOL_VERSION) {
119: log_debug("peer %p bad version %d", peer, version);
120:
121: proc_send(peer, MSG_VERSION, -1, NULL, 0);
122: peer->flags |= PEER_BAD;
123:
124: return (-1);
125: }
126: return (0);
1.1 nicm 127: }
128:
129: static void
130: proc_update_event(struct tmuxpeer *peer)
131: {
132: short events;
133:
134: event_del(&peer->event);
135:
136: events = EV_READ;
137: if (peer->ibuf.w.queued > 0)
138: events |= EV_WRITE;
139: event_set(&peer->event, peer->ibuf.fd, events, proc_event_cb, peer);
140:
141: event_add(&peer->event, NULL);
142: }
143:
144: int
145: proc_send(struct tmuxpeer *peer, enum msgtype type, int fd, const void *buf,
146: size_t len)
147: {
148: struct imsgbuf *ibuf = &peer->ibuf;
149: void *vp = (void *)buf;
150: int retval;
151:
152: if (peer->flags & PEER_BAD)
153: return (-1);
154: log_debug("sending message %d to peer %p (%zu bytes)", type, peer, len);
155:
156: retval = imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, fd, vp, len);
157: if (retval != 1)
158: return (-1);
159: proc_update_event(peer);
160: return (0);
161: }
162:
163: int
164: proc_send_s(struct tmuxpeer *peer, enum msgtype type, const char *s)
165: {
166: return (proc_send(peer, type, -1, s, strlen(s) + 1));
167: }
168:
169: struct tmuxproc *
170: proc_start(const char *name, struct event_base *base, int forkflag,
171: void (*signalcb)(int))
172: {
173: struct tmuxproc *tp;
1.6 ! nicm 174: struct utsname u;
1.1 nicm 175:
176: if (forkflag) {
177: switch (fork()) {
178: case -1:
179: fatal("fork failed");
180: case 0:
181: break;
182: default:
183: return (NULL);
184: }
185: if (daemon(1, 0) != 0)
186: fatal("daemon failed");
187:
188: clear_signals(0);
189: if (event_reinit(base) != 0)
190: fatalx("event_reinit failed");
191: }
192:
1.5 nicm 193: log_open(name);
1.1 nicm 194: setproctitle("%s (%s)", name, socket_path);
195:
1.6 ! nicm 196: if (uname(&u) < 0)
! 197: memset(&u, 0, sizeof u);
! 198:
1.1 nicm 199: log_debug("%s started (%ld): socket %s, protocol %d", name,
200: (long)getpid(), socket_path, PROTOCOL_VERSION);
1.6 ! nicm 201: log_debug("on %s %s %s; libevent %s (%s)", u.sysname, u.release,
! 202: u.version, event_get_version(), event_get_method());
1.1 nicm 203:
204: tp = xcalloc(1, sizeof *tp);
205: tp->name = xstrdup(name);
206:
207: tp->signalcb = signalcb;
208: set_signals(proc_signal_cb, tp);
209:
210: return (tp);
211: }
212:
213: void
214: proc_loop(struct tmuxproc *tp, int (*loopcb)(void))
215: {
216: log_debug("%s loop enter", tp->name);
217: do
218: event_loop(EVLOOP_ONCE);
219: while (!tp->exit && (loopcb == NULL || !loopcb ()));
220: log_debug("%s loop exit", tp->name);
221: }
222:
223: void
224: proc_exit(struct tmuxproc *tp)
225: {
226: tp->exit = 1;
227: }
228:
229: struct tmuxpeer *
230: proc_add_peer(struct tmuxproc *tp, int fd,
231: void (*dispatchcb)(struct imsg *, void *), void *arg)
232: {
233: struct tmuxpeer *peer;
234:
235: peer = xcalloc(1, sizeof *peer);
236: peer->parent = tp;
237:
238: peer->dispatchcb = dispatchcb;
239: peer->arg = arg;
240:
241: imsg_init(&peer->ibuf, fd);
242: event_set(&peer->event, fd, EV_READ, proc_event_cb, peer);
243:
244: log_debug("add peer %p: %d (%p)", peer, fd, arg);
245:
246: proc_update_event(peer);
247: return (peer);
248: }
249:
250: void
251: proc_remove_peer(struct tmuxpeer *peer)
252: {
253: log_debug("remove peer %p", peer);
254:
255: event_del(&peer->event);
256: imsg_clear(&peer->ibuf);
257:
258: close(peer->ibuf.fd);
259: free(peer);
260: }
261:
262: void
263: proc_kill_peer(struct tmuxpeer *peer)
264: {
265: peer->flags |= PEER_BAD;
266: }