1 /* $OpenBSD: proc.c,v 1.38 2023/03/05 22:17:22 tobhe 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 "iked.h" 38 39 enum privsep_procid privsep_process; 40 41 void proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int, 42 int, char **); 43 void proc_setup(struct privsep *, struct privsep_proc *, unsigned int); 44 void proc_open(struct privsep *, int, int); 45 void proc_accept(struct privsep *, int, enum privsep_procid, 46 unsigned int); 47 void proc_close(struct privsep *); 48 void proc_shutdown(struct privsep_proc *); 49 void proc_sig_handler(int, short, void *); 50 void proc_range(struct privsep *, enum privsep_procid, int *, int *); 51 int proc_dispatch_null(int, struct privsep_proc *, struct imsg *); 52 53 enum privsep_procid 54 proc_getid(struct privsep_proc *procs, unsigned int nproc, 55 const char *proc_name) 56 { 57 struct privsep_proc *p; 58 unsigned int proc; 59 60 for (proc = 0; proc < nproc; proc++) { 61 p = &procs[proc]; 62 if (strcmp(p->p_title, proc_name)) 63 continue; 64 65 return (p->p_id); 66 } 67 68 return (PROC_MAX); 69 } 70 71 void 72 proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc, 73 int debug, int argc, char **argv) 74 { 75 unsigned int proc, nargc, i, proc_i; 76 char **nargv; 77 struct privsep_proc *p; 78 char num[32]; 79 int fd; 80 81 /* Prepare the new process argv. */ 82 nargv = calloc(argc + 5, sizeof(char *)); 83 if (nargv == NULL) 84 fatal("%s: calloc", __func__); 85 86 /* Copy call argument first. */ 87 nargc = 0; 88 nargv[nargc++] = argv[0]; 89 90 /* Set process name argument and save the position. */ 91 nargv[nargc++] = "-P"; 92 proc_i = nargc; 93 nargc++; 94 95 /* Point process instance arg to stack and copy the original args. */ 96 nargv[nargc++] = "-I"; 97 nargv[nargc++] = num; 98 for (i = 1; i < (unsigned int) argc; i++) 99 nargv[nargc++] = argv[i]; 100 101 nargv[nargc] = NULL; 102 103 for (proc = 0; proc < nproc; proc++) { 104 p = &procs[proc]; 105 106 /* Update args with process title. */ 107 nargv[proc_i] = (char *)(uintptr_t)p->p_title; 108 109 /* Fire children processes. */ 110 for (i = 0; i < ps->ps_instances[p->p_id]; i++) { 111 /* Update the process instance number. */ 112 snprintf(num, sizeof(num), "%u", i); 113 114 fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0]; 115 ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0] = -1; 116 117 switch (fork()) { 118 case -1: 119 fatal("%s: fork", __func__); 120 break; 121 case 0: 122 /* First create a new session */ 123 if (setsid() == -1) 124 fatal("setsid"); 125 126 /* Prepare parent socket. */ 127 if (fd != PROC_PARENT_SOCK_FILENO) { 128 if (dup2(fd, PROC_PARENT_SOCK_FILENO) 129 == -1) 130 fatal("dup2"); 131 } else if (fcntl(fd, F_SETFD, 0) == -1) 132 fatal("fcntl"); 133 134 /* Daemons detach from terminal. */ 135 if (!debug && (fd = 136 open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 137 (void)dup2(fd, STDIN_FILENO); 138 (void)dup2(fd, STDOUT_FILENO); 139 (void)dup2(fd, STDERR_FILENO); 140 if (fd > 2) 141 (void)close(fd); 142 } 143 144 execvp(argv[0], nargv); 145 fatal("%s: execvp", __func__); 146 break; 147 default: 148 /* Close child end. */ 149 close(fd); 150 break; 151 } 152 } 153 } 154 free(nargv); 155 } 156 157 void 158 proc_connect(struct privsep *ps) 159 { 160 struct imsgev *iev; 161 unsigned int src, dst, inst; 162 163 /* Don't distribute any sockets if we are not really going to run. */ 164 if (ps->ps_noaction) 165 return; 166 167 for (dst = 0; dst < PROC_MAX; dst++) { 168 /* We don't communicate with ourselves. */ 169 if (dst == PROC_PARENT) 170 continue; 171 172 for (inst = 0; inst < ps->ps_instances[dst]; inst++) { 173 iev = &ps->ps_ievs[dst][inst]; 174 imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]); 175 event_set(&iev->ev, iev->ibuf.fd, iev->events, 176 iev->handler, iev->data); 177 event_add(&iev->ev, NULL); 178 } 179 } 180 181 /* Distribute the socketpair()s for everyone. */ 182 for (src = 0; src < PROC_MAX; src++) 183 for (dst = src; dst < PROC_MAX; dst++) { 184 /* Parent already distributed its fds. */ 185 if (src == PROC_PARENT || dst == PROC_PARENT) 186 continue; 187 188 proc_open(ps, src, dst); 189 } 190 } 191 192 void 193 proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc, 194 int debug, int argc, char **argv, enum privsep_procid proc_id) 195 { 196 struct privsep_proc *p = NULL; 197 struct privsep_pipes *pa, *pb; 198 unsigned int proc; 199 unsigned int dst; 200 int fds[2]; 201 202 /* Don't initiate anything if we are not really going to run. */ 203 if (ps->ps_noaction) 204 return; 205 206 if (proc_id == PROC_PARENT) { 207 privsep_process = PROC_PARENT; 208 proc_setup(ps, procs, nproc); 209 210 /* 211 * Create the children sockets so we can use them 212 * to distribute the rest of the socketpair()s using 213 * proc_connect() later. 214 */ 215 for (dst = 0; dst < PROC_MAX; dst++) { 216 /* Don't create socket for ourselves. */ 217 if (dst == PROC_PARENT) 218 continue; 219 220 for (proc = 0; proc < ps->ps_instances[dst]; proc++) { 221 pa = &ps->ps_pipes[PROC_PARENT][0]; 222 pb = &ps->ps_pipes[dst][proc]; 223 if (socketpair(AF_UNIX, 224 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 225 PF_UNSPEC, fds) == -1) 226 fatal("%s: socketpair", __func__); 227 228 pa->pp_pipes[dst][proc] = fds[0]; 229 pb->pp_pipes[PROC_PARENT][0] = fds[1]; 230 } 231 } 232 233 /* Engage! */ 234 proc_exec(ps, procs, nproc, debug, argc, argv); 235 return; 236 } 237 238 /* Initialize a child */ 239 for (proc = 0; proc < nproc; proc++) { 240 if (procs[proc].p_id != proc_id) 241 continue; 242 p = &procs[proc]; 243 break; 244 } 245 if (p == NULL || p->p_init == NULL) 246 fatalx("%s: process %d missing process initialization", 247 __func__, proc_id); 248 249 p->p_init(ps, p); 250 251 fatalx("failed to initiate child process"); 252 } 253 254 void 255 proc_accept(struct privsep *ps, int fd, enum privsep_procid dst, 256 unsigned int n) 257 { 258 struct privsep_pipes *pp = ps->ps_pp; 259 struct imsgev *iev; 260 261 if (ps->ps_ievs[dst] == NULL) { 262 #if DEBUG > 1 263 log_debug("%s: %s src %d %d to dst %d %d not connected", 264 __func__, ps->ps_title[privsep_process], 265 privsep_process, ps->ps_instance + 1, 266 dst, n + 1); 267 #endif 268 close(fd); 269 return; 270 } 271 272 if (pp->pp_pipes[dst][n] != -1) { 273 log_warnx("%s: duplicated descriptor", __func__); 274 close(fd); 275 return; 276 } else 277 pp->pp_pipes[dst][n] = fd; 278 279 iev = &ps->ps_ievs[dst][n]; 280 imsg_init(&iev->ibuf, fd); 281 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 282 event_add(&iev->ev, NULL); 283 } 284 285 void 286 proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc) 287 { 288 unsigned int i, j, src, dst, id; 289 struct privsep_pipes *pp; 290 291 /* Initialize parent title, ps_instances and procs. */ 292 ps->ps_title[PROC_PARENT] = "parent"; 293 294 for (src = 0; src < PROC_MAX; src++) 295 /* Default to 1 process instance */ 296 if (ps->ps_instances[src] < 1) 297 ps->ps_instances[src] = 1; 298 299 for (src = 0; src < nproc; src++) { 300 procs[src].p_ps = ps; 301 if (procs[src].p_cb == NULL) 302 procs[src].p_cb = proc_dispatch_null; 303 304 id = procs[src].p_id; 305 ps->ps_title[id] = procs[src].p_title; 306 if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id], 307 sizeof(struct imsgev))) == NULL) 308 fatal("%s: calloc", __func__); 309 310 /* With this set up, we are ready to call imsg_init(). */ 311 for (i = 0; i < ps->ps_instances[id]; i++) { 312 ps->ps_ievs[id][i].handler = proc_dispatch; 313 ps->ps_ievs[id][i].events = EV_READ; 314 ps->ps_ievs[id][i].proc = &procs[src]; 315 ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i]; 316 } 317 } 318 319 /* 320 * Allocate pipes for all process instances (incl. parent) 321 * 322 * - ps->ps_pipes: N:M mapping 323 * N source processes connected to M destination processes: 324 * [src][instances][dst][instances], for example 325 * [PROC_RELAY][3][PROC_CA][3] 326 * 327 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes 328 * Each process instance has a destination array of socketpair fds: 329 * [dst][instances], for example 330 * [PROC_PARENT][0] 331 */ 332 for (src = 0; src < PROC_MAX; src++) { 333 /* Allocate destination array for each process */ 334 if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src], 335 sizeof(struct privsep_pipes))) == NULL) 336 fatal("%s: calloc", __func__); 337 338 for (i = 0; i < ps->ps_instances[src]; i++) { 339 pp = &ps->ps_pipes[src][i]; 340 341 for (dst = 0; dst < PROC_MAX; dst++) { 342 /* Allocate maximum fd integers */ 343 if ((pp->pp_pipes[dst] = 344 calloc(ps->ps_instances[dst], 345 sizeof(int))) == NULL) 346 fatal("%s: calloc", __func__); 347 348 /* Mark fd as unused */ 349 for (j = 0; j < ps->ps_instances[dst]; j++) 350 pp->pp_pipes[dst][j] = -1; 351 } 352 } 353 } 354 355 ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance]; 356 } 357 358 void 359 proc_kill(struct privsep *ps) 360 { 361 char *cause; 362 pid_t pid; 363 int len, status; 364 365 if (privsep_process != PROC_PARENT) 366 return; 367 368 proc_close(ps); 369 370 do { 371 pid = waitpid(WAIT_ANY, &status, 0); 372 if (pid <= 0) 373 continue; 374 375 if (WIFSIGNALED(status)) { 376 len = asprintf(&cause, "terminated; signal %d", 377 WTERMSIG(status)); 378 } else if (WIFEXITED(status)) { 379 if (WEXITSTATUS(status) != 0) 380 len = asprintf(&cause, "exited abnormally"); 381 else 382 len = 0; 383 } else 384 len = -1; 385 386 if (len == 0) { 387 /* child exited OK, don't print a warning message */ 388 } else if (len != -1) { 389 log_warnx("lost child: pid %u %s", pid, cause); 390 free(cause); 391 } else 392 log_warnx("lost child: pid %u", pid); 393 } while (pid != -1 || (pid == -1 && errno == EINTR)); 394 } 395 396 void 397 proc_open(struct privsep *ps, int src, int dst) 398 { 399 struct privsep_pipes *pa, *pb; 400 struct privsep_fd pf; 401 int fds[2]; 402 unsigned int i, j; 403 404 /* Exchange pipes between process. */ 405 for (i = 0; i < ps->ps_instances[src]; i++) { 406 for (j = 0; j < ps->ps_instances[dst]; j++) { 407 /* Don't create sockets for ourself. */ 408 if (src == dst && i == j) 409 continue; 410 411 pa = &ps->ps_pipes[src][i]; 412 pb = &ps->ps_pipes[dst][j]; 413 if (socketpair(AF_UNIX, 414 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 415 PF_UNSPEC, fds) == -1) 416 fatal("%s: socketpair", __func__); 417 418 pa->pp_pipes[dst][j] = fds[0]; 419 pb->pp_pipes[src][i] = fds[1]; 420 421 pf.pf_procid = src; 422 pf.pf_instance = i; 423 if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD, 424 -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1) 425 fatal("%s: proc_compose_imsg", __func__); 426 427 pf.pf_procid = dst; 428 pf.pf_instance = j; 429 if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD, 430 -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1) 431 fatal("%s: proc_compose_imsg", __func__); 432 433 /* 434 * We have to flush to send the descriptors and close 435 * them to avoid the fd ramp on startup. 436 */ 437 if (proc_flush_imsg(ps, src, i) == -1 || 438 proc_flush_imsg(ps, dst, j) == -1) 439 fatal("%s: imsg_flush", __func__); 440 } 441 } 442 } 443 444 void 445 proc_close(struct privsep *ps) 446 { 447 unsigned int dst, n; 448 struct privsep_pipes *pp; 449 450 if (ps == NULL) 451 return; 452 453 pp = ps->ps_pp; 454 455 for (dst = 0; dst < PROC_MAX; dst++) { 456 if (ps->ps_ievs[dst] == NULL) 457 continue; 458 459 for (n = 0; n < ps->ps_instances[dst]; n++) { 460 if (pp->pp_pipes[dst][n] == -1) 461 continue; 462 463 /* Cancel the fd, close and invalidate the fd */ 464 event_del(&(ps->ps_ievs[dst][n].ev)); 465 imsg_clear(&(ps->ps_ievs[dst][n].ibuf)); 466 close(pp->pp_pipes[dst][n]); 467 pp->pp_pipes[dst][n] = -1; 468 } 469 free(ps->ps_ievs[dst]); 470 } 471 } 472 473 void 474 proc_shutdown(struct privsep_proc *p) 475 { 476 struct privsep *ps = p->p_ps; 477 478 if (p->p_shutdown != NULL) 479 (*p->p_shutdown)(); 480 481 proc_close(ps); 482 483 log_info("%s exiting, pid %d", p->p_title, getpid()); 484 485 exit(0); 486 } 487 488 void 489 proc_sig_handler(int sig, short event, void *arg) 490 { 491 struct privsep_proc *p = arg; 492 493 switch (sig) { 494 case SIGINT: 495 case SIGTERM: 496 proc_shutdown(p); 497 break; 498 case SIGCHLD: 499 case SIGHUP: 500 case SIGPIPE: 501 case SIGUSR1: 502 /* ignore */ 503 break; 504 default: 505 fatalx("%s: unexpected signal", __func__); 506 /* NOTREACHED */ 507 } 508 } 509 510 void 511 proc_run(struct privsep *ps, struct privsep_proc *p, 512 struct privsep_proc *procs, unsigned int nproc, 513 void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg) 514 { 515 struct passwd *pw; 516 const char *root; 517 struct control_sock *rcs; 518 519 log_procinit(p->p_title); 520 521 /* Set the process group of the current process */ 522 setpgid(0, 0); 523 524 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 525 if (control_init(ps, &ps->ps_csock) == -1) 526 fatalx("%s: control_init", __func__); 527 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 528 if (control_init(ps, rcs) == -1) 529 fatalx("%s: control_init", __func__); 530 } 531 532 /* Use non-standard user */ 533 if (p->p_pw != NULL) 534 pw = p->p_pw; 535 else 536 pw = ps->ps_pw; 537 538 /* Change root directory */ 539 if (p->p_chroot != NULL) 540 root = p->p_chroot; 541 else 542 root = pw->pw_dir; 543 544 if (chroot(root) == -1) 545 fatal("%s: chroot", __func__); 546 if (chdir("/") == -1) 547 fatal("%s: chdir(\"/\")", __func__); 548 549 privsep_process = p->p_id; 550 551 setproctitle("%s", p->p_title); 552 553 if (setgroups(1, &pw->pw_gid) || 554 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 555 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 556 fatal("%s: cannot drop privileges", __func__); 557 558 event_init(); 559 560 signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p); 561 signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p); 562 signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p); 563 signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p); 564 signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p); 565 signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p); 566 567 signal_add(&ps->ps_evsigint, NULL); 568 signal_add(&ps->ps_evsigterm, NULL); 569 signal_add(&ps->ps_evsigchld, NULL); 570 signal_add(&ps->ps_evsighup, NULL); 571 signal_add(&ps->ps_evsigpipe, NULL); 572 signal_add(&ps->ps_evsigusr1, NULL); 573 574 proc_setup(ps, procs, nproc); 575 proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0); 576 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 577 if (control_listen(&ps->ps_csock) == -1) 578 fatalx("%s: control_listen", __func__); 579 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 580 if (control_listen(rcs) == -1) 581 fatalx("%s: control_listen", __func__); 582 } 583 584 #if DEBUG 585 log_debug("%s: %s %d/%d, pid %d", __func__, p->p_title, 586 ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid()); 587 #endif 588 589 if (run != NULL) 590 run(ps, p, arg); 591 592 event_dispatch(); 593 594 proc_shutdown(p); 595 } 596 597 void 598 proc_dispatch(int fd, short event, void *arg) 599 { 600 struct imsgev *iev = arg; 601 struct privsep_proc *p = iev->proc; 602 struct privsep *ps = p->p_ps; 603 struct imsgbuf *ibuf; 604 struct imsg imsg; 605 ssize_t n; 606 int verbose; 607 const char *title; 608 struct privsep_fd pf; 609 610 title = ps->ps_title[privsep_process]; 611 ibuf = &iev->ibuf; 612 613 if (event & EV_READ) { 614 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 615 fatal("%s: imsg_read", __func__); 616 if (n == 0) { 617 /* this pipe is dead, so remove the event handler */ 618 event_del(&iev->ev); 619 event_loopexit(NULL); 620 return; 621 } 622 } 623 624 if (event & EV_WRITE) { 625 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 626 fatal("%s: msgbuf_write", __func__); 627 if (n == 0) { 628 /* this pipe is dead, so remove the event handler */ 629 event_del(&iev->ev); 630 event_loopexit(NULL); 631 return; 632 } 633 } 634 635 for (;;) { 636 if ((n = imsg_get(ibuf, &imsg)) == -1) 637 fatal("%s: imsg_get", __func__); 638 if (n == 0) 639 break; 640 641 #if DEBUG > 1 642 log_debug("%s: %s %d got imsg %d peerid %d from %s %d", 643 __func__, title, ps->ps_instance + 1, 644 imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid); 645 #endif 646 647 /* 648 * Check the message with the program callback 649 */ 650 if ((p->p_cb)(fd, p, &imsg) == 0) { 651 /* Message was handled by the callback, continue */ 652 imsg_free(&imsg); 653 continue; 654 } 655 656 /* 657 * Generic message handling 658 */ 659 switch (imsg.hdr.type) { 660 case IMSG_CTL_VERBOSE: 661 IMSG_SIZE_CHECK(&imsg, &verbose); 662 memcpy(&verbose, imsg.data, sizeof(verbose)); 663 log_setverbose(verbose); 664 break; 665 case IMSG_CTL_PROCFD: 666 IMSG_SIZE_CHECK(&imsg, &pf); 667 memcpy(&pf, imsg.data, sizeof(pf)); 668 proc_accept(ps, imsg.fd, pf.pf_procid, 669 pf.pf_instance); 670 break; 671 default: 672 fatalx("%s: %s %d got invalid imsg %d peerid %d " 673 "from %s %d", 674 __func__, title, ps->ps_instance + 1, 675 imsg.hdr.type, imsg.hdr.peerid, 676 p->p_title, imsg.hdr.pid); 677 } 678 imsg_free(&imsg); 679 } 680 imsg_event_add(iev); 681 } 682 683 int 684 proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg) 685 { 686 return (-1); 687 } 688 689 /* 690 * imsg helper functions 691 */ 692 693 void 694 imsg_event_add(struct imsgev *iev) 695 { 696 if (iev->handler == NULL) { 697 imsg_flush(&iev->ibuf); 698 return; 699 } 700 701 iev->events = EV_READ; 702 if (iev->ibuf.w.queued) 703 iev->events |= EV_WRITE; 704 705 event_del(&iev->ev); 706 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 707 event_add(&iev->ev, NULL); 708 } 709 710 int 711 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 712 pid_t pid, int fd, void *data, uint16_t datalen) 713 { 714 int ret; 715 716 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 717 pid, fd, data, datalen)) == -1) 718 return (ret); 719 imsg_event_add(iev); 720 return (ret); 721 } 722 723 int 724 imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 725 pid_t pid, int fd, const struct iovec *iov, int iovcnt) 726 { 727 int ret; 728 729 if ((ret = imsg_composev(&iev->ibuf, type, peerid, 730 pid, fd, iov, iovcnt)) == -1) 731 return (ret); 732 imsg_event_add(iev); 733 return (ret); 734 } 735 736 void 737 proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m) 738 { 739 if (*n == -1) { 740 /* Use a range of all target instances */ 741 *n = 0; 742 *m = ps->ps_instances[id]; 743 } else { 744 /* Use only a single slot of the specified peer process */ 745 *m = *n + 1; 746 } 747 } 748 749 int 750 proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n, 751 uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen) 752 { 753 int m; 754 755 proc_range(ps, id, &n, &m); 756 for (; n < m; n++) { 757 if (imsg_compose_event(&ps->ps_ievs[id][n], 758 type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1) 759 return (-1); 760 } 761 762 return (0); 763 } 764 765 int 766 proc_compose(struct privsep *ps, enum privsep_procid id, 767 uint16_t type, void *data, uint16_t datalen) 768 { 769 return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen)); 770 } 771 772 int 773 proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n, 774 uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt) 775 { 776 int m; 777 778 proc_range(ps, id, &n, &m); 779 for (; n < m; n++) 780 if (imsg_composev_event(&ps->ps_ievs[id][n], 781 type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1) 782 return (-1); 783 784 return (0); 785 } 786 787 int 788 proc_composev(struct privsep *ps, enum privsep_procid id, 789 uint16_t type, const struct iovec *iov, int iovcnt) 790 { 791 return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt)); 792 } 793 794 int 795 proc_forward_imsg(struct privsep *ps, struct imsg *imsg, 796 enum privsep_procid id, int n) 797 { 798 return (proc_compose_imsg(ps, id, n, imsg->hdr.type, 799 imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg))); 800 } 801 802 struct imsgbuf * 803 proc_ibuf(struct privsep *ps, enum privsep_procid id, int n) 804 { 805 int m; 806 807 proc_range(ps, id, &n, &m); 808 return (&ps->ps_ievs[id][n].ibuf); 809 } 810 811 struct imsgev * 812 proc_iev(struct privsep *ps, enum privsep_procid id, int n) 813 { 814 int m; 815 816 proc_range(ps, id, &n, &m); 817 return (&ps->ps_ievs[id][n]); 818 } 819 820 /* This function should only be called with care as it breaks async I/O */ 821 int 822 proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n) 823 { 824 struct imsgbuf *ibuf; 825 int m, ret = 0; 826 827 proc_range(ps, id, &n, &m); 828 for (; n < m; n++) { 829 if ((ibuf = proc_ibuf(ps, id, n)) == NULL) 830 return (-1); 831 do { 832 ret = imsg_flush(ibuf); 833 } while (ret == -1 && errno == EAGAIN); 834 if (ret == -1) 835 break; 836 imsg_event_add(&ps->ps_ievs[id][n]); 837 } 838 839 return (ret); 840 } 841