1 /* $OpenBSD: proc.c,v 1.45 2024/01/17 10:01:24 claudio Exp $ */
2
3 /*
4 * Copyright (c) 2010 - 2016 Reyk Floeter <reyk@openbsd.org>
5 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/types.h>
21 #include <sys/queue.h>
22 #include <sys/socket.h>
23 #include <sys/wait.h>
24
25 #include <fcntl.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <unistd.h>
29 #include <string.h>
30 #include <errno.h>
31 #include <signal.h>
32 #include <paths.h>
33 #include <pwd.h>
34 #include <event.h>
35 #include <imsg.h>
36
37 #include "relayd.h"
38
39 void proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int,
40 char **);
41 void proc_setup(struct privsep *, struct privsep_proc *, unsigned int);
42 void proc_open(struct privsep *, int, int);
43 void proc_accept(struct privsep *, int, enum privsep_procid,
44 unsigned int);
45 void proc_close(struct privsep *);
46 void proc_shutdown(struct privsep_proc *);
47 void proc_sig_handler(int, short, void *);
48 void proc_range(struct privsep *, enum privsep_procid, int *, int *);
49 int proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
50
51 enum privsep_procid
proc_getid(struct privsep_proc * procs,unsigned int nproc,const char * proc_name)52 proc_getid(struct privsep_proc *procs, unsigned int nproc,
53 const char *proc_name)
54 {
55 struct privsep_proc *p;
56 unsigned int proc;
57
58 for (proc = 0; proc < nproc; proc++) {
59 p = &procs[proc];
60 if (strcmp(p->p_title, proc_name))
61 continue;
62
63 return (p->p_id);
64 }
65
66 return (PROC_MAX);
67 }
68
69 void
proc_exec(struct privsep * ps,struct privsep_proc * procs,unsigned int nproc,int argc,char ** argv)70 proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
71 int argc, char **argv)
72 {
73 unsigned int proc, nargc, i, proc_i;
74 char **nargv;
75 struct privsep_proc *p;
76 char num[32];
77 int fd;
78
79 /* Prepare the new process argv. */
80 nargv = calloc(argc + 5, sizeof(char *));
81 if (nargv == NULL)
82 fatal("%s: calloc", __func__);
83
84 /* Copy call argument first. */
85 nargc = 0;
86 nargv[nargc++] = argv[0];
87
88 /* Set process name argument and save the position. */
89 nargv[nargc++] = "-P";
90 proc_i = nargc;
91 nargc++;
92
93 /* Point process instance arg to stack and copy the original args. */
94 nargv[nargc++] = "-I";
95 nargv[nargc++] = num;
96 for (i = 1; i < (unsigned int) argc; i++)
97 nargv[nargc++] = argv[i];
98
99 nargv[nargc] = NULL;
100
101 for (proc = 0; proc < nproc; proc++) {
102 p = &procs[proc];
103
104 /* Update args with process title. */
105 nargv[proc_i] = (char *)(uintptr_t)p->p_title;
106
107 /* Fire children processes. */
108 for (i = 0; i < ps->ps_instances[p->p_id]; i++) {
109 /* Update the process instance number. */
110 snprintf(num, sizeof(num), "%u", i);
111
112 fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0];
113 ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0] = -1;
114
115 switch (fork()) {
116 case -1:
117 fatal("%s: fork", __func__);
118 break;
119 case 0:
120 /* Prepare parent socket. */
121 if (fd != PROC_PARENT_SOCK_FILENO) {
122 if (dup2(fd, PROC_PARENT_SOCK_FILENO)
123 == -1)
124 fatal("dup2");
125 } else if (fcntl(fd, F_SETFD, 0) == -1)
126 fatal("fcntl");
127
128 execvp(argv[0], nargv);
129 fatal("%s: execvp", __func__);
130 break;
131 default:
132 /* Close child end. */
133 close(fd);
134 break;
135 }
136 }
137 }
138 free(nargv);
139 }
140
141 void
proc_connect(struct privsep * ps)142 proc_connect(struct privsep *ps)
143 {
144 struct imsgev *iev;
145 unsigned int src, dst, inst;
146
147 /* Don't distribute any sockets if we are not really going to run. */
148 if (ps->ps_noaction)
149 return;
150
151 for (dst = 0; dst < PROC_MAX; dst++) {
152 /* We don't communicate with ourselves. */
153 if (dst == PROC_PARENT)
154 continue;
155
156 for (inst = 0; inst < ps->ps_instances[dst]; inst++) {
157 iev = &ps->ps_ievs[dst][inst];
158 imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]);
159 event_set(&iev->ev, iev->ibuf.fd, iev->events,
160 iev->handler, iev->data);
161 event_add(&iev->ev, NULL);
162 }
163 }
164
165 /* Distribute the socketpair()s for everyone. */
166 for (src = 0; src < PROC_MAX; src++)
167 for (dst = src; dst < PROC_MAX; dst++) {
168 /* Parent already distributed its fds. */
169 if (src == PROC_PARENT || dst == PROC_PARENT)
170 continue;
171
172 proc_open(ps, src, dst);
173 }
174 }
175
176 void
proc_init(struct privsep * ps,struct privsep_proc * procs,unsigned int nproc,int debug,int argc,char ** argv,enum privsep_procid proc_id)177 proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc,
178 int debug, int argc, char **argv, enum privsep_procid proc_id)
179 {
180 struct privsep_proc *p = NULL;
181 struct privsep_pipes *pa, *pb;
182 unsigned int proc;
183 unsigned int dst;
184 int fds[2];
185
186 /* Don't initiate anything if we are not really going to run. */
187 if (ps->ps_noaction)
188 return;
189
190 if (proc_id == PROC_PARENT) {
191 privsep_process = PROC_PARENT;
192 proc_setup(ps, procs, nproc);
193
194 if (!debug && daemon(1, 0) == -1)
195 fatal("failed to daemonize");
196
197 /*
198 * Create the children sockets so we can use them
199 * to distribute the rest of the socketpair()s using
200 * proc_connect() later.
201 */
202 for (dst = 0; dst < PROC_MAX; dst++) {
203 /* Don't create socket for ourselves. */
204 if (dst == PROC_PARENT)
205 continue;
206
207 for (proc = 0; proc < ps->ps_instances[dst]; proc++) {
208 pa = &ps->ps_pipes[PROC_PARENT][0];
209 pb = &ps->ps_pipes[dst][proc];
210 if (socketpair(AF_UNIX,
211 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
212 PF_UNSPEC, fds) == -1)
213 fatal("%s: socketpair", __func__);
214
215 pa->pp_pipes[dst][proc] = fds[0];
216 pb->pp_pipes[PROC_PARENT][0] = fds[1];
217 }
218 }
219
220 /* Engage! */
221 proc_exec(ps, procs, nproc, argc, argv);
222 return;
223 }
224
225 /* Initialize a child */
226 for (proc = 0; proc < nproc; proc++) {
227 if (procs[proc].p_id != proc_id)
228 continue;
229 p = &procs[proc];
230 break;
231 }
232 if (p == NULL || p->p_init == NULL)
233 fatalx("%s: process %d missing process initialization",
234 __func__, proc_id);
235
236 p->p_init(ps, p);
237
238 fatalx("failed to initiate child process");
239 }
240
241 void
proc_accept(struct privsep * ps,int fd,enum privsep_procid dst,unsigned int n)242 proc_accept(struct privsep *ps, int fd, enum privsep_procid dst,
243 unsigned int n)
244 {
245 struct privsep_pipes *pp = ps->ps_pp;
246 struct imsgev *iev;
247
248 if (ps->ps_ievs[dst] == NULL) {
249 #if DEBUG > 1
250 log_debug("%s: %s src %d %d to dst %d %d not connected",
251 __func__, ps->ps_title[privsep_process],
252 privsep_process, ps->ps_instance + 1,
253 dst, n + 1);
254 #endif
255 close(fd);
256 return;
257 }
258
259 if (pp->pp_pipes[dst][n] != -1) {
260 log_warnx("%s: duplicated descriptor", __func__);
261 close(fd);
262 return;
263 } else
264 pp->pp_pipes[dst][n] = fd;
265
266 iev = &ps->ps_ievs[dst][n];
267 imsg_init(&iev->ibuf, fd);
268 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
269 event_add(&iev->ev, NULL);
270 }
271
272 void
proc_setup(struct privsep * ps,struct privsep_proc * procs,unsigned int nproc)273 proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
274 {
275 unsigned int i, j, src, dst, id;
276 struct privsep_pipes *pp;
277
278 /* Initialize parent title, ps_instances and procs. */
279 ps->ps_title[PROC_PARENT] = "parent";
280
281 for (src = 0; src < PROC_MAX; src++)
282 /* Default to 1 process instance */
283 if (ps->ps_instances[src] < 1)
284 ps->ps_instances[src] = 1;
285
286 for (src = 0; src < nproc; src++) {
287 procs[src].p_ps = ps;
288 if (procs[src].p_cb == NULL)
289 procs[src].p_cb = proc_dispatch_null;
290
291 id = procs[src].p_id;
292 ps->ps_title[id] = procs[src].p_title;
293 if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id],
294 sizeof(struct imsgev))) == NULL)
295 fatal("%s: calloc", __func__);
296
297 /* With this set up, we are ready to call imsg_init(). */
298 for (i = 0; i < ps->ps_instances[id]; i++) {
299 ps->ps_ievs[id][i].handler = proc_dispatch;
300 ps->ps_ievs[id][i].events = EV_READ;
301 ps->ps_ievs[id][i].proc = &procs[src];
302 ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i];
303 }
304 }
305
306 /*
307 * Allocate pipes for all process instances (incl. parent)
308 *
309 * - ps->ps_pipes: N:M mapping
310 * N source processes connected to M destination processes:
311 * [src][instances][dst][instances], for example
312 * [PROC_RELAY][3][PROC_CA][3]
313 *
314 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
315 * Each process instance has a destination array of socketpair fds:
316 * [dst][instances], for example
317 * [PROC_PARENT][0]
318 */
319 for (src = 0; src < PROC_MAX; src++) {
320 /* Allocate destination array for each process */
321 if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src],
322 sizeof(struct privsep_pipes))) == NULL)
323 fatal("%s: calloc", __func__);
324
325 for (i = 0; i < ps->ps_instances[src]; i++) {
326 pp = &ps->ps_pipes[src][i];
327
328 for (dst = 0; dst < PROC_MAX; dst++) {
329 /* Allocate maximum fd integers */
330 if ((pp->pp_pipes[dst] =
331 calloc(ps->ps_instances[dst],
332 sizeof(int))) == NULL)
333 fatal("%s: calloc", __func__);
334
335 /* Mark fd as unused */
336 for (j = 0; j < ps->ps_instances[dst]; j++)
337 pp->pp_pipes[dst][j] = -1;
338 }
339 }
340 }
341
342 ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance];
343 }
344
345 void
proc_kill(struct privsep * ps)346 proc_kill(struct privsep *ps)
347 {
348 char *cause;
349 pid_t pid;
350 int len, status;
351
352 if (privsep_process != PROC_PARENT)
353 return;
354
355 proc_close(ps);
356
357 do {
358 pid = waitpid(WAIT_ANY, &status, 0);
359 if (pid <= 0)
360 continue;
361
362 if (WIFSIGNALED(status)) {
363 len = asprintf(&cause, "terminated; signal %d",
364 WTERMSIG(status));
365 } else if (WIFEXITED(status)) {
366 if (WEXITSTATUS(status) != 0)
367 len = asprintf(&cause, "exited abnormally");
368 else
369 len = 0;
370 } else
371 len = -1;
372
373 if (len == 0) {
374 /* child exited OK, don't print a warning message */
375 } else if (len != -1) {
376 log_warnx("lost child: pid %u %s", pid, cause);
377 free(cause);
378 } else
379 log_warnx("lost child: pid %u", pid);
380 } while (pid != -1 || (pid == -1 && errno == EINTR));
381 }
382
383 void
proc_open(struct privsep * ps,int src,int dst)384 proc_open(struct privsep *ps, int src, int dst)
385 {
386 struct privsep_pipes *pa, *pb;
387 struct privsep_fd pf;
388 int fds[2];
389 unsigned int i, j;
390
391 /* Exchange pipes between process. */
392 for (i = 0; i < ps->ps_instances[src]; i++) {
393 for (j = 0; j < ps->ps_instances[dst]; j++) {
394 /* Don't create sockets for ourself. */
395 if (src == dst && i == j)
396 continue;
397
398 /* No need for CA to CA or RELAY to RELAY sockets. */
399 if ((src == PROC_CA && dst == PROC_CA) ||
400 (src == PROC_RELAY && dst == PROC_RELAY))
401 continue;
402
403 pa = &ps->ps_pipes[src][i];
404 pb = &ps->ps_pipes[dst][j];
405 if (socketpair(AF_UNIX,
406 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
407 PF_UNSPEC, fds) == -1)
408 fatal("%s: socketpair", __func__);
409
410 pa->pp_pipes[dst][j] = fds[0];
411 pb->pp_pipes[src][i] = fds[1];
412
413 pf.pf_procid = src;
414 pf.pf_instance = i;
415 if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD,
416 -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1)
417 fatal("%s: proc_compose_imsg", __func__);
418
419 pf.pf_procid = dst;
420 pf.pf_instance = j;
421 if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD,
422 -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1)
423 fatal("%s: proc_compose_imsg", __func__);
424
425 /*
426 * We have to flush to send the descriptors and close
427 * them to avoid the fd ramp on startup.
428 */
429 if (proc_flush_imsg(ps, src, i) == -1 ||
430 proc_flush_imsg(ps, dst, j) == -1)
431 fatal("%s: imsg_flush", __func__);
432 }
433 }
434 }
435
436 void
proc_close(struct privsep * ps)437 proc_close(struct privsep *ps)
438 {
439 unsigned int dst, n;
440 struct privsep_pipes *pp;
441
442 if (ps == NULL)
443 return;
444
445 pp = ps->ps_pp;
446
447 for (dst = 0; dst < PROC_MAX; dst++) {
448 if (ps->ps_ievs[dst] == NULL)
449 continue;
450
451 for (n = 0; n < ps->ps_instances[dst]; n++) {
452 if (pp->pp_pipes[dst][n] == -1)
453 continue;
454
455 /* Cancel the fd, close and invalidate the fd */
456 event_del(&(ps->ps_ievs[dst][n].ev));
457 imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
458 close(pp->pp_pipes[dst][n]);
459 pp->pp_pipes[dst][n] = -1;
460 }
461 free(ps->ps_ievs[dst]);
462 }
463 }
464
465 void
proc_shutdown(struct privsep_proc * p)466 proc_shutdown(struct privsep_proc *p)
467 {
468 struct privsep *ps = p->p_ps;
469
470 if (p->p_id == PROC_CONTROL && ps)
471 control_cleanup(&ps->ps_csock);
472
473 if (p->p_shutdown != NULL)
474 (*p->p_shutdown)();
475
476 proc_close(ps);
477
478 log_info("%s exiting, pid %d", p->p_title, getpid());
479
480 exit(0);
481 }
482
483 void
proc_sig_handler(int sig,short event,void * arg)484 proc_sig_handler(int sig, short event, void *arg)
485 {
486 struct privsep_proc *p = arg;
487
488 switch (sig) {
489 case SIGINT:
490 case SIGTERM:
491 proc_shutdown(p);
492 break;
493 case SIGCHLD:
494 case SIGHUP:
495 case SIGPIPE:
496 case SIGUSR1:
497 /* ignore */
498 break;
499 default:
500 fatalx("%s: unexpected signal", __func__);
501 /* NOTREACHED */
502 }
503 }
504
505 void
proc_run(struct privsep * ps,struct privsep_proc * p,struct privsep_proc * procs,unsigned int nproc,void (* run)(struct privsep *,struct privsep_proc *,void *),void * arg)506 proc_run(struct privsep *ps, struct privsep_proc *p,
507 struct privsep_proc *procs, unsigned int nproc,
508 void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
509 {
510 struct passwd *pw;
511 const char *root;
512 struct control_sock *rcs;
513
514 log_procinit(p->p_title);
515
516 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
517 if (control_init(ps, &ps->ps_csock) == -1)
518 fatalx("%s: control_init", __func__);
519 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
520 if (control_init(ps, rcs) == -1)
521 fatalx("%s: control_init", __func__);
522 }
523
524 /* Use non-standard user */
525 if (p->p_pw != NULL)
526 pw = p->p_pw;
527 else
528 pw = ps->ps_pw;
529
530 /* Change root directory */
531 if (p->p_chroot != NULL)
532 root = p->p_chroot;
533 else
534 root = pw->pw_dir;
535
536 if (chroot(root) == -1)
537 fatal("%s: chroot", __func__);
538 if (chdir("/") == -1)
539 fatal("%s: chdir(\"/\")", __func__);
540
541 privsep_process = p->p_id;
542
543 setproctitle("%s", p->p_title);
544
545 if (setgroups(1, &pw->pw_gid) ||
546 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
547 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
548 fatal("%s: cannot drop privileges", __func__);
549
550 event_init();
551
552 signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
553 signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
554 signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
555 signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
556 signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
557 signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);
558
559 signal_add(&ps->ps_evsigint, NULL);
560 signal_add(&ps->ps_evsigterm, NULL);
561 signal_add(&ps->ps_evsigchld, NULL);
562 signal_add(&ps->ps_evsighup, NULL);
563 signal_add(&ps->ps_evsigpipe, NULL);
564 signal_add(&ps->ps_evsigusr1, NULL);
565
566 proc_setup(ps, procs, nproc);
567 proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0);
568 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
569 if (control_listen(&ps->ps_csock) == -1)
570 fatalx("%s: control_listen", __func__);
571 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
572 if (control_listen(rcs) == -1)
573 fatalx("%s: control_listen", __func__);
574 }
575
576 DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title,
577 ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
578
579 if (run != NULL)
580 run(ps, p, arg);
581
582 event_dispatch();
583
584 proc_shutdown(p);
585 }
586
587 void
proc_dispatch(int fd,short event,void * arg)588 proc_dispatch(int fd, short event, void *arg)
589 {
590 struct imsgev *iev = arg;
591 struct privsep_proc *p = iev->proc;
592 struct privsep *ps = p->p_ps;
593 struct imsgbuf *ibuf;
594 struct imsg imsg;
595 ssize_t n;
596 int verbose;
597 const char *title;
598 struct privsep_fd pf;
599
600 title = ps->ps_title[privsep_process];
601 ibuf = &iev->ibuf;
602
603 if (event & EV_READ) {
604 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
605 fatal("%s: imsg_read", __func__);
606 if (n == 0) {
607 /* this pipe is dead, so remove the event handler */
608 event_del(&iev->ev);
609 event_loopexit(NULL);
610 return;
611 }
612 }
613
614 if (event & EV_WRITE) {
615 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
616 fatal("%s: msgbuf_write", __func__);
617 if (n == 0) {
618 /* this pipe is dead, so remove the event handler */
619 event_del(&iev->ev);
620 event_loopexit(NULL);
621 return;
622 }
623 }
624
625 for (;;) {
626 if ((n = imsg_get(ibuf, &imsg)) == -1)
627 fatal("%s: imsg_get", __func__);
628 if (n == 0)
629 break;
630
631 #if DEBUG > 1
632 log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
633 __func__, title, ps->ps_instance + 1,
634 imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid);
635 #endif
636
637 /*
638 * Check the message with the program callback
639 */
640 if ((p->p_cb)(fd, p, &imsg) == 0) {
641 /* Message was handled by the callback, continue */
642 imsg_free(&imsg);
643 continue;
644 }
645
646 /*
647 * Generic message handling
648 */
649 switch (imsg.hdr.type) {
650 case IMSG_CTL_VERBOSE:
651 IMSG_SIZE_CHECK(&imsg, &verbose);
652 memcpy(&verbose, imsg.data, sizeof(verbose));
653 log_setverbose(verbose);
654 break;
655 case IMSG_CTL_PROCFD:
656 IMSG_SIZE_CHECK(&imsg, &pf);
657 memcpy(&pf, imsg.data, sizeof(pf));
658 proc_accept(ps, imsg_get_fd(&imsg), pf.pf_procid,
659 pf.pf_instance);
660 break;
661 default:
662 fatalx("%s: %s %d got invalid imsg %d peerid %d "
663 "from %s %d",
664 __func__, title, ps->ps_instance + 1,
665 imsg.hdr.type, imsg.hdr.peerid,
666 p->p_title, imsg.hdr.pid);
667 }
668 imsg_free(&imsg);
669 }
670 imsg_event_add(iev);
671 }
672
673 int
proc_dispatch_null(int fd,struct privsep_proc * p,struct imsg * imsg)674 proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
675 {
676 return (-1);
677 }
678
679 /*
680 * imsg helper functions
681 */
682
683 void
imsg_event_add(struct imsgev * iev)684 imsg_event_add(struct imsgev *iev)
685 {
686 if (iev->handler == NULL) {
687 imsg_flush(&iev->ibuf);
688 return;
689 }
690
691 iev->events = EV_READ;
692 if (iev->ibuf.w.queued)
693 iev->events |= EV_WRITE;
694
695 event_del(&iev->ev);
696 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
697 event_add(&iev->ev, NULL);
698 }
699
700 int
imsg_compose_event(struct imsgev * iev,uint16_t type,uint32_t peerid,pid_t pid,int fd,void * data,uint16_t datalen)701 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
702 pid_t pid, int fd, void *data, uint16_t datalen)
703 {
704 int ret;
705
706 if ((ret = imsg_compose(&iev->ibuf, type, peerid,
707 pid, fd, data, datalen)) == -1)
708 return (ret);
709 imsg_event_add(iev);
710 return (ret);
711 }
712
713 int
imsg_composev_event(struct imsgev * iev,uint16_t type,uint32_t peerid,pid_t pid,int fd,const struct iovec * iov,int iovcnt)714 imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
715 pid_t pid, int fd, const struct iovec *iov, int iovcnt)
716 {
717 int ret;
718
719 if ((ret = imsg_composev(&iev->ibuf, type, peerid,
720 pid, fd, iov, iovcnt)) == -1)
721 return (ret);
722 imsg_event_add(iev);
723 return (ret);
724 }
725
726 void
proc_range(struct privsep * ps,enum privsep_procid id,int * n,int * m)727 proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
728 {
729 if (*n == -1) {
730 /* Use a range of all target instances */
731 *n = 0;
732 *m = ps->ps_instances[id];
733 } else {
734 /* Use only a single slot of the specified peer process */
735 *m = *n + 1;
736 }
737 }
738
739 int
proc_compose_imsg(struct privsep * ps,enum privsep_procid id,int n,uint16_t type,uint32_t peerid,int fd,void * data,uint16_t datalen)740 proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
741 uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
742 {
743 int m;
744
745 proc_range(ps, id, &n, &m);
746 for (; n < m; n++) {
747 if (imsg_compose_event(&ps->ps_ievs[id][n],
748 type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1)
749 return (-1);
750 }
751
752 return (0);
753 }
754
755 int
proc_compose(struct privsep * ps,enum privsep_procid id,uint16_t type,void * data,uint16_t datalen)756 proc_compose(struct privsep *ps, enum privsep_procid id,
757 uint16_t type, void *data, uint16_t datalen)
758 {
759 return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
760 }
761
762 int
proc_composev_imsg(struct privsep * ps,enum privsep_procid id,int n,uint16_t type,uint32_t peerid,int fd,const struct iovec * iov,int iovcnt)763 proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
764 uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
765 {
766 int m;
767
768 proc_range(ps, id, &n, &m);
769 for (; n < m; n++)
770 if (imsg_composev_event(&ps->ps_ievs[id][n],
771 type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1)
772 return (-1);
773
774 return (0);
775 }
776
777 int
proc_composev(struct privsep * ps,enum privsep_procid id,uint16_t type,const struct iovec * iov,int iovcnt)778 proc_composev(struct privsep *ps, enum privsep_procid id,
779 uint16_t type, const struct iovec *iov, int iovcnt)
780 {
781 return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
782 }
783
784 int
proc_forward_imsg(struct privsep * ps,struct imsg * imsg,enum privsep_procid id,int n)785 proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
786 enum privsep_procid id, int n)
787 {
788 return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
789 imsg->hdr.peerid, -1, imsg->data, IMSG_DATA_SIZE(imsg)));
790 }
791
792 struct imsgbuf *
proc_ibuf(struct privsep * ps,enum privsep_procid id,int n)793 proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
794 {
795 int m;
796
797 proc_range(ps, id, &n, &m);
798 return (&ps->ps_ievs[id][n].ibuf);
799 }
800
801 struct imsgev *
proc_iev(struct privsep * ps,enum privsep_procid id,int n)802 proc_iev(struct privsep *ps, enum privsep_procid id, int n)
803 {
804 int m;
805
806 proc_range(ps, id, &n, &m);
807 return (&ps->ps_ievs[id][n]);
808 }
809
810 /* This function should only be called with care as it breaks async I/O */
811 int
proc_flush_imsg(struct privsep * ps,enum privsep_procid id,int n)812 proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n)
813 {
814 struct imsgbuf *ibuf;
815 int m, ret = 0;
816
817 proc_range(ps, id, &n, &m);
818 for (; n < m; n++) {
819 if ((ibuf = proc_ibuf(ps, id, n)) == NULL)
820 return (-1);
821 do {
822 ret = imsg_flush(ibuf);
823 } while (ret == -1 && errno == EAGAIN);
824 if (ret == -1)
825 break;
826 imsg_event_add(&ps->ps_ievs[id][n]);
827 }
828
829 return (ret);
830 }
831