1 /* $OpenBSD: proc.c,v 1.39 2024/11/21 13:38:45 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/socket.h> 21 #include <sys/wait.h> 22 23 #include <fcntl.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <stdint.h> 27 #include <unistd.h> 28 #include <string.h> 29 #include <errno.h> 30 #include <signal.h> 31 #include <paths.h> 32 #include <pwd.h> 33 #include <event.h> 34 #include <imsg.h> 35 36 #include "log.h" 37 #include "snmpd.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 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 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 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 if (imsgbuf_init(&iev->ibuf, 159 ps->ps_pp->pp_pipes[dst][inst]) == -1) 160 fatal("imsgbuf_init"); 161 imsgbuf_allow_fdpass(&iev->ibuf); 162 event_set(&iev->ev, iev->ibuf.fd, iev->events, 163 iev->handler, iev->data); 164 event_add(&iev->ev, NULL); 165 } 166 } 167 168 /* Distribute the socketpair()s for everyone. */ 169 for (src = 0; src < PROC_MAX; src++) 170 for (dst = src; dst < PROC_MAX; dst++) { 171 /* Parent already distributed its fds. */ 172 if (src == PROC_PARENT || dst == PROC_PARENT) 173 continue; 174 175 proc_open(ps, src, dst); 176 } 177 } 178 179 void 180 proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc, 181 int debug, int argc, char **argv, enum privsep_procid proc_id) 182 { 183 struct privsep_proc *p = NULL; 184 struct privsep_pipes *pa, *pb; 185 unsigned int proc; 186 unsigned int dst; 187 int fds[2]; 188 189 /* Don't initiate anything if we are not really going to run. */ 190 if (ps->ps_noaction) 191 return; 192 193 if (proc_id == PROC_PARENT) { 194 privsep_process = PROC_PARENT; 195 proc_setup(ps, procs, nproc); 196 197 if (!debug && daemon(0, 0) == -1) 198 fatal("failed to daemonize"); 199 200 /* 201 * Create the children sockets so we can use them 202 * to distribute the rest of the socketpair()s using 203 * proc_connect() later. 204 */ 205 for (dst = 0; dst < PROC_MAX; dst++) { 206 /* Don't create socket for ourselves. */ 207 if (dst == PROC_PARENT) 208 continue; 209 210 for (proc = 0; proc < ps->ps_instances[dst]; proc++) { 211 pa = &ps->ps_pipes[PROC_PARENT][0]; 212 pb = &ps->ps_pipes[dst][proc]; 213 if (socketpair(AF_UNIX, 214 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 215 PF_UNSPEC, fds) == -1) 216 fatal("%s: socketpair", __func__); 217 218 pa->pp_pipes[dst][proc] = fds[0]; 219 pb->pp_pipes[PROC_PARENT][0] = fds[1]; 220 } 221 } 222 223 /* Engage! */ 224 proc_exec(ps, procs, nproc, argc, argv); 225 return; 226 } 227 228 /* Initialize a child */ 229 for (proc = 0; proc < nproc; proc++) { 230 if (procs[proc].p_id != proc_id) 231 continue; 232 p = &procs[proc]; 233 break; 234 } 235 if (p == NULL || p->p_init == NULL) 236 fatalx("%s: process %d missing process initialization", 237 __func__, proc_id); 238 239 p->p_init(ps, p); 240 241 fatalx("failed to initiate child process"); 242 } 243 244 void 245 proc_accept(struct privsep *ps, int fd, enum privsep_procid dst, 246 unsigned int n) 247 { 248 struct privsep_pipes *pp = ps->ps_pp; 249 struct imsgev *iev; 250 251 if (ps->ps_ievs[dst] == NULL) { 252 #if DEBUG > 1 253 log_debug("%s: %s src %d %d to dst %d %d not connected", 254 __func__, ps->ps_title[privsep_process], 255 privsep_process, ps->ps_instance + 1, 256 dst, n + 1); 257 #endif 258 close(fd); 259 return; 260 } 261 262 if (pp->pp_pipes[dst][n] != -1) { 263 log_warnx("%s: duplicated descriptor", __func__); 264 close(fd); 265 return; 266 } else 267 pp->pp_pipes[dst][n] = fd; 268 269 iev = &ps->ps_ievs[dst][n]; 270 if (imsgbuf_init(&iev->ibuf, fd) == -1) 271 fatal("imsgbuf_init"); 272 imsgbuf_allow_fdpass(&iev->ibuf); 273 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 274 event_add(&iev->ev, NULL); 275 } 276 277 void 278 proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc) 279 { 280 unsigned int i, j, src, dst, id; 281 struct privsep_pipes *pp; 282 283 /* Initialize parent title, ps_instances and procs. */ 284 ps->ps_title[PROC_PARENT] = "parent"; 285 286 for (src = 0; src < PROC_MAX; src++) 287 /* Default to 1 process instance */ 288 if (ps->ps_instances[src] < 1) 289 ps->ps_instances[src] = 1; 290 291 for (src = 0; src < nproc; src++) { 292 procs[src].p_ps = ps; 293 if (procs[src].p_cb == NULL) 294 procs[src].p_cb = proc_dispatch_null; 295 296 id = procs[src].p_id; 297 ps->ps_title[id] = procs[src].p_title; 298 if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id], 299 sizeof(struct imsgev))) == NULL) 300 fatal("%s: calloc", __func__); 301 302 /* With this set up, we are ready to call imsgbuf_init(). */ 303 for (i = 0; i < ps->ps_instances[id]; i++) { 304 ps->ps_ievs[id][i].handler = proc_dispatch; 305 ps->ps_ievs[id][i].events = EV_READ; 306 ps->ps_ievs[id][i].proc = &procs[src]; 307 ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i]; 308 } 309 } 310 311 /* 312 * Allocate pipes for all process instances (incl. parent) 313 * 314 * - ps->ps_pipes: N:M mapping 315 * N source processes connected to M destination processes: 316 * [src][instances][dst][instances], for example 317 * [PROC_RELAY][3][PROC_CA][3] 318 * 319 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes 320 * Each process instance has a destination array of socketpair fds: 321 * [dst][instances], for example 322 * [PROC_PARENT][0] 323 */ 324 for (src = 0; src < PROC_MAX; src++) { 325 /* Allocate destination array for each process */ 326 if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src], 327 sizeof(struct privsep_pipes))) == NULL) 328 fatal("%s: calloc", __func__); 329 330 for (i = 0; i < ps->ps_instances[src]; i++) { 331 pp = &ps->ps_pipes[src][i]; 332 333 for (dst = 0; dst < PROC_MAX; dst++) { 334 /* Allocate maximum fd integers */ 335 if ((pp->pp_pipes[dst] = 336 calloc(ps->ps_instances[dst], 337 sizeof(int))) == NULL) 338 fatal("%s: calloc", __func__); 339 340 /* Mark fd as unused */ 341 for (j = 0; j < ps->ps_instances[dst]; j++) 342 pp->pp_pipes[dst][j] = -1; 343 } 344 } 345 } 346 347 ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance]; 348 } 349 350 void 351 proc_kill(struct privsep *ps) 352 { 353 char *cause; 354 pid_t pid; 355 int len, status; 356 357 if (privsep_process != PROC_PARENT) 358 return; 359 360 proc_close(ps); 361 362 do { 363 pid = waitpid(WAIT_ANY, &status, 0); 364 if (pid <= 0) 365 continue; 366 367 if (WIFSIGNALED(status)) { 368 len = asprintf(&cause, "terminated; signal %d", 369 WTERMSIG(status)); 370 } else if (WIFEXITED(status)) { 371 if (WEXITSTATUS(status) != 0) 372 len = asprintf(&cause, "exited abnormally"); 373 else 374 len = 0; 375 } else 376 len = -1; 377 378 if (len == 0) { 379 /* child exited OK, don't print a warning message */ 380 } else if (len != -1) { 381 log_warnx("lost child: pid %u %s", pid, cause); 382 free(cause); 383 } else 384 log_warnx("lost child: pid %u", pid); 385 } while (pid != -1 || (pid == -1 && errno == EINTR)); 386 } 387 388 void 389 proc_open(struct privsep *ps, int src, int dst) 390 { 391 struct privsep_pipes *pa, *pb; 392 struct privsep_fd pf; 393 int fds[2]; 394 unsigned int i, j; 395 396 /* Exchange pipes between process. */ 397 for (i = 0; i < ps->ps_instances[src]; i++) { 398 for (j = 0; j < ps->ps_instances[dst]; j++) { 399 /* Don't create sockets for ourself. */ 400 if (src == dst && i == j) 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: proc_flush_imsg", __func__); 432 } 433 } 434 } 435 436 void 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 imsgbuf_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 466 proc_shutdown(struct privsep_proc *p) 467 { 468 struct privsep *ps = p->p_ps; 469 470 if (p->p_shutdown != NULL) 471 (*p->p_shutdown)(); 472 473 proc_close(ps); 474 475 log_info("%s exiting, pid %d", p->p_title, getpid()); 476 477 exit(0); 478 } 479 480 void 481 proc_sig_handler(int sig, short event, void *arg) 482 { 483 struct privsep_proc *p = arg; 484 485 switch (sig) { 486 case SIGINT: 487 case SIGTERM: 488 proc_shutdown(p); 489 break; 490 case SIGCHLD: 491 case SIGHUP: 492 case SIGPIPE: 493 case SIGUSR1: 494 /* ignore */ 495 break; 496 default: 497 fatalx("%s: unexpected signal", __func__); 498 /* NOTREACHED */ 499 } 500 } 501 502 void 503 proc_run(struct privsep *ps, struct privsep_proc *p, 504 struct privsep_proc *procs, unsigned int nproc, 505 void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg) 506 { 507 struct passwd *pw; 508 const char *root; 509 510 log_procinit(p->p_title); 511 512 /* Use non-standard user */ 513 if (p->p_pw != NULL) 514 pw = p->p_pw; 515 else 516 pw = ps->ps_pw; 517 518 /* Change root directory */ 519 if (p->p_chroot != NULL) 520 root = p->p_chroot; 521 else 522 root = pw->pw_dir; 523 524 if (chroot(root) == -1) 525 fatal("%s: chroot", __func__); 526 if (chdir("/") == -1) 527 fatal("%s: chdir(\"/\")", __func__); 528 529 privsep_process = p->p_id; 530 531 setproctitle("%s", p->p_title); 532 533 if (setgroups(1, &pw->pw_gid) || 534 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 535 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 536 fatal("%s: cannot drop privileges", __func__); 537 538 event_init(); 539 540 signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p); 541 signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p); 542 signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p); 543 signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p); 544 signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p); 545 signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p); 546 547 signal_add(&ps->ps_evsigint, NULL); 548 signal_add(&ps->ps_evsigterm, NULL); 549 signal_add(&ps->ps_evsigchld, NULL); 550 signal_add(&ps->ps_evsighup, NULL); 551 signal_add(&ps->ps_evsigpipe, NULL); 552 signal_add(&ps->ps_evsigusr1, NULL); 553 554 proc_setup(ps, procs, nproc); 555 proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0); 556 DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title, 557 ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid()); 558 559 if (run != NULL) 560 run(ps, p, arg); 561 562 event_dispatch(); 563 564 proc_shutdown(p); 565 } 566 567 void 568 proc_dispatch(int fd, short event, void *arg) 569 { 570 struct imsgev *iev = arg; 571 struct privsep_proc *p = iev->proc; 572 struct privsep *ps = p->p_ps; 573 struct imsgbuf *ibuf; 574 struct imsg imsg; 575 ssize_t n; 576 int verbose; 577 const char *title; 578 struct privsep_fd pf; 579 580 title = ps->ps_title[privsep_process]; 581 ibuf = &iev->ibuf; 582 583 if (event & EV_READ) { 584 if ((n = imsgbuf_read(ibuf)) == -1) 585 fatal("%s: imsgbuf_read", __func__); 586 if (n == 0) { 587 /* this pipe is dead, so remove the event handler */ 588 event_del(&iev->ev); 589 event_loopexit(NULL); 590 return; 591 } 592 } 593 594 if (event & EV_WRITE) { 595 if (imsgbuf_write(ibuf) == -1) { 596 if (errno == EPIPE) { 597 /* this pipe is dead, remove the handler */ 598 event_del(&iev->ev); 599 event_loopexit(NULL); 600 return; 601 } 602 fatal("%s: imsgbuf_write", __func__); 603 } 604 } 605 606 for (;;) { 607 if ((n = imsg_get(ibuf, &imsg)) == -1) 608 fatal("%s: imsg_get", __func__); 609 if (n == 0) 610 break; 611 612 #if DEBUG > 1 613 log_debug("%s: %s %d got imsg %d peerid %d from %s %d", 614 __func__, title, ps->ps_instance + 1, 615 imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid); 616 #endif 617 618 /* 619 * Check the message with the program callback 620 */ 621 if ((p->p_cb)(fd, p, &imsg) == 0) { 622 /* Message was handled by the callback, continue */ 623 imsg_free(&imsg); 624 continue; 625 } 626 627 /* 628 * Generic message handling 629 */ 630 switch (imsg.hdr.type) { 631 case IMSG_CTL_VERBOSE: 632 IMSG_SIZE_CHECK(&imsg, &verbose); 633 memcpy(&verbose, imsg.data, sizeof(verbose)); 634 log_setverbose(verbose); 635 break; 636 case IMSG_CTL_PROCFD: 637 IMSG_SIZE_CHECK(&imsg, &pf); 638 memcpy(&pf, imsg.data, sizeof(pf)); 639 proc_accept(ps, imsg_get_fd(&imsg), pf.pf_procid, 640 pf.pf_instance); 641 break; 642 default: 643 fatalx("%s: %s %d got invalid imsg %d peerid %d " 644 "from %s %d", 645 __func__, title, ps->ps_instance + 1, 646 imsg.hdr.type, imsg.hdr.peerid, 647 p->p_title, imsg.hdr.pid); 648 } 649 imsg_free(&imsg); 650 } 651 imsg_event_add(iev); 652 } 653 654 int 655 proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg) 656 { 657 return (-1); 658 } 659 660 /* 661 * imsg helper functions 662 */ 663 664 void 665 imsg_event_add(struct imsgev *iev) 666 { 667 if (iev->handler == NULL) { 668 imsgbuf_flush(&iev->ibuf); 669 return; 670 } 671 672 iev->events = EV_READ; 673 if (imsgbuf_queuelen(&iev->ibuf) > 0) 674 iev->events |= EV_WRITE; 675 676 event_del(&iev->ev); 677 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 678 event_add(&iev->ev, NULL); 679 } 680 681 int 682 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 683 pid_t pid, int fd, void *data, uint16_t datalen) 684 { 685 int ret; 686 687 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 688 pid, fd, data, datalen)) == -1) 689 return (ret); 690 imsg_event_add(iev); 691 return (ret); 692 } 693 694 int 695 imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 696 pid_t pid, int fd, const struct iovec *iov, int iovcnt) 697 { 698 int ret; 699 700 if ((ret = imsg_composev(&iev->ibuf, type, peerid, 701 pid, fd, iov, iovcnt)) == -1) 702 return (ret); 703 imsg_event_add(iev); 704 return (ret); 705 } 706 707 void 708 proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m) 709 { 710 if (*n == -1) { 711 /* Use a range of all target instances */ 712 *n = 0; 713 *m = ps->ps_instances[id]; 714 } else { 715 /* Use only a single slot of the specified peer process */ 716 *m = *n + 1; 717 } 718 } 719 720 int 721 proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n, 722 uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen) 723 { 724 int m; 725 726 proc_range(ps, id, &n, &m); 727 for (; n < m; n++) { 728 if (imsg_compose_event(&ps->ps_ievs[id][n], 729 type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1) 730 return (-1); 731 } 732 733 return (0); 734 } 735 736 int 737 proc_compose(struct privsep *ps, enum privsep_procid id, 738 uint16_t type, void *data, uint16_t datalen) 739 { 740 return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen)); 741 } 742 743 int 744 proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n, 745 uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt) 746 { 747 int m; 748 749 proc_range(ps, id, &n, &m); 750 for (; n < m; n++) 751 if (imsg_composev_event(&ps->ps_ievs[id][n], 752 type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1) 753 return (-1); 754 755 return (0); 756 } 757 758 int 759 proc_composev(struct privsep *ps, enum privsep_procid id, 760 uint16_t type, const struct iovec *iov, int iovcnt) 761 { 762 return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt)); 763 } 764 765 struct imsgbuf * 766 proc_ibuf(struct privsep *ps, enum privsep_procid id, int n) 767 { 768 int m; 769 770 proc_range(ps, id, &n, &m); 771 return (&ps->ps_ievs[id][n].ibuf); 772 } 773 774 struct imsgev * 775 proc_iev(struct privsep *ps, enum privsep_procid id, int n) 776 { 777 int m; 778 779 proc_range(ps, id, &n, &m); 780 return (&ps->ps_ievs[id][n]); 781 } 782 783 /* This function should only be called with care as it breaks async I/O */ 784 int 785 proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n) 786 { 787 struct imsgbuf *ibuf; 788 int m, ret = 0; 789 790 proc_range(ps, id, &n, &m); 791 for (; n < m; n++) { 792 if ((ibuf = proc_ibuf(ps, id, n)) == NULL) 793 return (-1); 794 if ((ret = imsgbuf_flush(ibuf)) == -1) 795 break; 796 imsg_event_add(&ps->ps_ievs[id][n]); 797 } 798 799 return (ret); 800 } 801