Annotation of src/usr.bin/tmux/proc.c, Revision 1.21
1.21 ! nicm 1: /* $OpenBSD: proc.c,v 1.20 2021/02/11 09:39:29 nicm Exp $ */
1.1 nicm 2:
3: /*
1.8 nicm 4: * Copyright (c) 2015 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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>
1.20 nicm 21: #include <sys/socket.h>
1.1 nicm 22: #include <sys/uio.h>
1.6 nicm 23: #include <sys/utsname.h>
1.1 nicm 24:
25: #include <errno.h>
26: #include <event.h>
27: #include <imsg.h>
1.12 nicm 28: #include <signal.h>
1.1 nicm 29: #include <stdlib.h>
30: #include <string.h>
31: #include <unistd.h>
32:
33: #include "tmux.h"
34:
35: struct tmuxproc {
36: const char *name;
37: int exit;
38:
39: void (*signalcb)(int);
1.12 nicm 40:
1.17 nicm 41: struct event ev_sigint;
1.12 nicm 42: struct event ev_sighup;
43: struct event ev_sigchld;
44: struct event ev_sigcont;
45: struct event ev_sigterm;
46: struct event ev_sigusr1;
47: struct event ev_sigusr2;
48: struct event ev_sigwinch;
1.20 nicm 49:
50: TAILQ_HEAD(, tmuxpeer) peers;
1.1 nicm 51: };
52:
53: struct tmuxpeer {
54: struct tmuxproc *parent;
55:
56: struct imsgbuf ibuf;
57: struct event event;
1.21 ! nicm 58: uid_t uid;
1.1 nicm 59:
60: int flags;
61: #define PEER_BAD 0x1
62:
63: void (*dispatchcb)(struct imsg *, void *);
1.10 nicm 64: void *arg;
1.20 nicm 65:
66: TAILQ_ENTRY(tmuxpeer) entry;
1.1 nicm 67: };
68:
1.2 nicm 69: static int peer_check_version(struct tmuxpeer *, struct imsg *);
70: static void proc_update_event(struct tmuxpeer *);
1.1 nicm 71:
72: static void
1.4 nicm 73: proc_event_cb(__unused int fd, short events, void *arg)
1.1 nicm 74: {
75: struct tmuxpeer *peer = arg;
76: ssize_t n;
77: struct imsg imsg;
78:
79: if (!(peer->flags & PEER_BAD) && (events & EV_READ)) {
1.7 claudio 80: if (((n = imsg_read(&peer->ibuf)) == -1 && errno != EAGAIN) ||
81: n == 0) {
1.1 nicm 82: peer->dispatchcb(NULL, peer->arg);
83: return;
84: }
85: for (;;) {
86: if ((n = imsg_get(&peer->ibuf, &imsg)) == -1) {
87: peer->dispatchcb(NULL, peer->arg);
88: return;
89: }
90: if (n == 0)
91: break;
92: log_debug("peer %p message %d", peer, imsg.hdr.type);
93:
1.2 nicm 94: if (peer_check_version(peer, &imsg) != 0) {
1.1 nicm 95: if (imsg.fd != -1)
96: close(imsg.fd);
97: imsg_free(&imsg);
98: break;
99: }
100:
101: peer->dispatchcb(&imsg, peer->arg);
102: imsg_free(&imsg);
103: }
104: }
105:
106: if (events & EV_WRITE) {
107: if (msgbuf_write(&peer->ibuf.w) <= 0 && errno != EAGAIN) {
108: peer->dispatchcb(NULL, peer->arg);
109: return;
110: }
111: }
112:
113: if ((peer->flags & PEER_BAD) && peer->ibuf.w.queued == 0) {
114: peer->dispatchcb(NULL, peer->arg);
115: return;
116: }
117:
118: proc_update_event(peer);
119: }
120:
121: static void
1.4 nicm 122: proc_signal_cb(int signo, __unused short events, void *arg)
1.1 nicm 123: {
124: struct tmuxproc *tp = arg;
125:
126: tp->signalcb(signo);
1.2 nicm 127: }
128:
129: static int
130: peer_check_version(struct tmuxpeer *peer, struct imsg *imsg)
131: {
132: int version;
133:
134: version = imsg->hdr.peerid & 0xff;
135: if (imsg->hdr.type != MSG_VERSION && version != PROTOCOL_VERSION) {
136: log_debug("peer %p bad version %d", peer, version);
137:
138: proc_send(peer, MSG_VERSION, -1, NULL, 0);
139: peer->flags |= PEER_BAD;
140:
141: return (-1);
142: }
143: return (0);
1.1 nicm 144: }
145:
146: static void
147: proc_update_event(struct tmuxpeer *peer)
148: {
149: short events;
150:
151: event_del(&peer->event);
152:
153: events = EV_READ;
154: if (peer->ibuf.w.queued > 0)
155: events |= EV_WRITE;
156: event_set(&peer->event, peer->ibuf.fd, events, proc_event_cb, peer);
157:
158: event_add(&peer->event, NULL);
159: }
160:
161: int
162: proc_send(struct tmuxpeer *peer, enum msgtype type, int fd, const void *buf,
163: size_t len)
164: {
165: struct imsgbuf *ibuf = &peer->ibuf;
166: void *vp = (void *)buf;
167: int retval;
168:
169: if (peer->flags & PEER_BAD)
170: return (-1);
171: log_debug("sending message %d to peer %p (%zu bytes)", type, peer, len);
172:
173: retval = imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, fd, vp, len);
174: if (retval != 1)
175: return (-1);
176: proc_update_event(peer);
177: return (0);
178: }
179:
180: struct tmuxproc *
1.12 nicm 181: proc_start(const char *name)
1.1 nicm 182: {
183: struct tmuxproc *tp;
1.6 nicm 184: struct utsname u;
1.1 nicm 185:
1.5 nicm 186: log_open(name);
1.1 nicm 187: setproctitle("%s (%s)", name, socket_path);
188:
1.6 nicm 189: if (uname(&u) < 0)
190: memset(&u, 0, sizeof u);
191:
1.16 nicm 192: log_debug("%s started (%ld): version %s, socket %s, protocol %d", name,
193: (long)getpid(), getversion(), socket_path, PROTOCOL_VERSION);
1.6 nicm 194: log_debug("on %s %s %s; libevent %s (%s)", u.sysname, u.release,
195: u.version, event_get_version(), event_get_method());
1.1 nicm 196:
197: tp = xcalloc(1, sizeof *tp);
198: tp->name = xstrdup(name);
1.20 nicm 199: TAILQ_INIT(&tp->peers);
1.1 nicm 200:
201: return (tp);
202: }
203:
204: void
205: proc_loop(struct tmuxproc *tp, int (*loopcb)(void))
206: {
207: log_debug("%s loop enter", tp->name);
208: do
209: event_loop(EVLOOP_ONCE);
210: while (!tp->exit && (loopcb == NULL || !loopcb ()));
211: log_debug("%s loop exit", tp->name);
212: }
213:
214: void
215: proc_exit(struct tmuxproc *tp)
216: {
1.20 nicm 217: struct tmuxpeer *peer;
218:
219: TAILQ_FOREACH(peer, &tp->peers, entry)
220: imsg_flush(&peer->ibuf);
1.1 nicm 221: tp->exit = 1;
1.12 nicm 222: }
223:
224: void
225: proc_set_signals(struct tmuxproc *tp, void (*signalcb)(int))
226: {
227: struct sigaction sa;
228:
229: tp->signalcb = signalcb;
230:
231: memset(&sa, 0, sizeof sa);
232: sigemptyset(&sa.sa_mask);
233: sa.sa_flags = SA_RESTART;
234: sa.sa_handler = SIG_IGN;
235:
236: sigaction(SIGPIPE, &sa, NULL);
237: sigaction(SIGTSTP, &sa, NULL);
1.17 nicm 238: sigaction(SIGTTIN, &sa, NULL);
239: sigaction(SIGTTOU, &sa, NULL);
1.18 nicm 240: sigaction(SIGQUIT, &sa, NULL);
1.12 nicm 241:
1.17 nicm 242: signal_set(&tp->ev_sigint, SIGINT, proc_signal_cb, tp);
243: signal_add(&tp->ev_sigint, NULL);
1.12 nicm 244: signal_set(&tp->ev_sighup, SIGHUP, proc_signal_cb, tp);
245: signal_add(&tp->ev_sighup, NULL);
246: signal_set(&tp->ev_sigchld, SIGCHLD, proc_signal_cb, tp);
247: signal_add(&tp->ev_sigchld, NULL);
248: signal_set(&tp->ev_sigcont, SIGCONT, proc_signal_cb, tp);
249: signal_add(&tp->ev_sigcont, NULL);
250: signal_set(&tp->ev_sigterm, SIGTERM, proc_signal_cb, tp);
251: signal_add(&tp->ev_sigterm, NULL);
252: signal_set(&tp->ev_sigusr1, SIGUSR1, proc_signal_cb, tp);
253: signal_add(&tp->ev_sigusr1, NULL);
254: signal_set(&tp->ev_sigusr2, SIGUSR2, proc_signal_cb, tp);
255: signal_add(&tp->ev_sigusr2, NULL);
256: signal_set(&tp->ev_sigwinch, SIGWINCH, proc_signal_cb, tp);
257: signal_add(&tp->ev_sigwinch, NULL);
258: }
259:
260: void
1.15 nicm 261: proc_clear_signals(struct tmuxproc *tp, int defaults)
1.12 nicm 262: {
263: struct sigaction sa;
264:
265: memset(&sa, 0, sizeof sa);
266: sigemptyset(&sa.sa_mask);
267: sa.sa_flags = SA_RESTART;
268: sa.sa_handler = SIG_DFL;
269:
270: sigaction(SIGPIPE, &sa, NULL);
271: sigaction(SIGTSTP, &sa, NULL);
272:
1.17 nicm 273: signal_del(&tp->ev_sigint);
1.14 nicm 274: signal_del(&tp->ev_sighup);
275: signal_del(&tp->ev_sigchld);
276: signal_del(&tp->ev_sigcont);
277: signal_del(&tp->ev_sigterm);
278: signal_del(&tp->ev_sigusr1);
279: signal_del(&tp->ev_sigusr2);
280: signal_del(&tp->ev_sigwinch);
1.15 nicm 281:
282: if (defaults) {
1.17 nicm 283: sigaction(SIGINT, &sa, NULL);
1.19 nicm 284: sigaction(SIGQUIT, &sa, NULL);
1.15 nicm 285: sigaction(SIGHUP, &sa, NULL);
286: sigaction(SIGCHLD, &sa, NULL);
287: sigaction(SIGCONT, &sa, NULL);
288: sigaction(SIGTERM, &sa, NULL);
289: sigaction(SIGUSR1, &sa, NULL);
290: sigaction(SIGUSR2, &sa, NULL);
291: sigaction(SIGWINCH, &sa, NULL);
292: }
1.1 nicm 293: }
294:
295: struct tmuxpeer *
296: proc_add_peer(struct tmuxproc *tp, int fd,
297: void (*dispatchcb)(struct imsg *, void *), void *arg)
298: {
299: struct tmuxpeer *peer;
1.21 ! nicm 300: gid_t gid;
1.1 nicm 301:
302: peer = xcalloc(1, sizeof *peer);
303: peer->parent = tp;
304:
305: peer->dispatchcb = dispatchcb;
306: peer->arg = arg;
307:
308: imsg_init(&peer->ibuf, fd);
309: event_set(&peer->event, fd, EV_READ, proc_event_cb, peer);
310:
1.21 ! nicm 311: if (getpeereid(fd, &peer->uid, &gid) != 0)
! 312: peer->uid = (uid_t)-1;
! 313:
1.1 nicm 314: log_debug("add peer %p: %d (%p)", peer, fd, arg);
1.20 nicm 315: TAILQ_INSERT_TAIL(&tp->peers, peer, entry);
1.1 nicm 316:
317: proc_update_event(peer);
318: return (peer);
319: }
320:
321: void
322: proc_remove_peer(struct tmuxpeer *peer)
323: {
1.20 nicm 324: TAILQ_REMOVE(&peer->parent->peers, peer, entry);
1.1 nicm 325: log_debug("remove peer %p", peer);
326:
327: event_del(&peer->event);
328: imsg_clear(&peer->ibuf);
329:
330: close(peer->ibuf.fd);
331: free(peer);
332: }
333:
334: void
335: proc_kill_peer(struct tmuxpeer *peer)
336: {
337: peer->flags |= PEER_BAD;
1.9 nicm 338: }
339:
340: void
341: proc_toggle_log(struct tmuxproc *tp)
342: {
343: log_toggle(tp->name);
1.20 nicm 344: }
345:
346: pid_t
347: proc_fork_and_daemon(int *fd)
348: {
349: pid_t pid;
350: int pair[2];
351:
352: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
353: fatal("socketpair failed");
354: switch (pid = fork()) {
355: case -1:
356: fatal("fork failed");
357: case 0:
358: close(pair[0]);
359: *fd = pair[1];
360: if (daemon(1, 0) != 0)
361: fatal("daemon failed");
362: return (0);
363: default:
364: close(pair[1]);
365: *fd = pair[0];
366: return (pid);
367: }
1.21 ! nicm 368: }
! 369:
! 370: uid_t
! 371: proc_get_peer_uid(struct tmuxpeer *peer)
! 372: {
! 373: return (peer->uid);
1.1 nicm 374: }
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