1/* $OpenBSD: proc.c,v 1.25 2024/04/09 15:48:01 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 "proc.h" 38 39void proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int, 40 char **); 41void proc_setup(struct privsep *, struct privsep_proc *, unsigned int); 42void proc_open(struct privsep *, int, int); 43void proc_accept(struct privsep *, int, enum privsep_procid, 44 unsigned int); 45void proc_close(struct privsep *); 46void proc_shutdown(struct privsep_proc *); 47void proc_sig_handler(int, short, void *); 48void proc_range(struct privsep *, enum privsep_procid, int *, int *); 49int proc_dispatch_null(int, struct privsep_proc *, struct imsg *); 50 51enum privsep_procid 52proc_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 69void 70proc_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 141void 142proc_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 176void 177proc_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(0, 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 241void 242proc_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 272void 273proc_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] = "vmd"; 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 345void 346proc_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 383void 384proc_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 pa = &ps->ps_pipes[src][i]; 399 pb = &ps->ps_pipes[dst][j]; 400 if (socketpair(AF_UNIX, 401 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 402 PF_UNSPEC, fds) == -1) 403 fatal("%s: socketpair", __func__); 404 405 pa->pp_pipes[dst][j] = fds[0]; 406 pb->pp_pipes[src][i] = fds[1]; 407 408 pf.pf_procid = src; 409 pf.pf_instance = i; 410 if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD, 411 -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1) 412 fatal("%s: proc_compose_imsg", __func__); 413 414 pf.pf_procid = dst; 415 pf.pf_instance = j; 416 if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD, 417 -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1) 418 fatal("%s: proc_compose_imsg", __func__); 419 420 /* 421 * We have to flush to send the descriptors and close 422 * them to avoid the fd ramp on startup. 423 */ 424 if (proc_flush_imsg(ps, src, i) == -1 || 425 proc_flush_imsg(ps, dst, j) == -1) 426 fatal("%s: imsg_flush", __func__); 427 } 428 } 429} 430 431void 432proc_close(struct privsep *ps) 433{ 434 unsigned int dst, n; 435 struct privsep_pipes *pp; 436 437 if (ps == NULL) 438 return; 439 440 pp = ps->ps_pp; 441 442 for (dst = 0; dst < PROC_MAX; dst++) { 443 if (ps->ps_ievs[dst] == NULL) 444 continue; 445 446 for (n = 0; n < ps->ps_instances[dst]; n++) { 447 if (pp->pp_pipes[dst][n] == -1) 448 continue; 449 450 /* Cancel the fd, close and invalidate the fd */ 451 event_del(&(ps->ps_ievs[dst][n].ev)); 452 imsg_clear(&(ps->ps_ievs[dst][n].ibuf)); 453 close(pp->pp_pipes[dst][n]); 454 pp->pp_pipes[dst][n] = -1; 455 } 456 free(ps->ps_ievs[dst]); 457 } 458} 459 460void 461proc_shutdown(struct privsep_proc *p) 462{ 463 struct privsep *ps = p->p_ps; 464 465 if (p->p_shutdown != NULL) 466 (*p->p_shutdown)(); 467 468 proc_close(ps); 469 470 log_info("%s exiting, pid %d", p->p_title, getpid()); 471 472 exit(0); 473} 474 475void 476proc_sig_handler(int sig, short event, void *arg) 477{ 478 struct privsep_proc *p = arg; 479 480 switch (sig) { 481 case SIGINT: 482 case SIGTERM: 483 proc_shutdown(p); 484 break; 485 case SIGCHLD: 486 case SIGHUP: 487 case SIGPIPE: 488 case SIGUSR1: 489 /* ignore */ 490 break; 491 default: 492 fatalx("%s: unexpected signal", __func__); 493 /* NOTREACHED */ 494 } 495} 496 497void 498proc_run(struct privsep *ps, struct privsep_proc *p, 499 struct privsep_proc *procs, unsigned int nproc, 500 void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg) 501{ 502 struct passwd *pw; 503 const char *root; 504 struct control_sock *rcs; 505 506 log_procinit("%s", p->p_title); 507 508 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 509 if (control_init(ps, &ps->ps_csock) == -1) 510 fatalx("%s: control_init", __func__); 511 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 512 if (control_init(ps, rcs) == -1) 513 fatalx("%s: control_init", __func__); 514 } 515 516 /* Use non-standard user */ 517 if (p->p_pw != NULL) 518 pw = p->p_pw; 519 else 520 pw = ps->ps_pw; 521 522 /* Change root directory */ 523 if (p->p_chroot != NULL) 524 root = p->p_chroot; 525 else 526 root = pw->pw_dir; 527 528 if (chroot(root) == -1) 529 fatal("%s: chroot", __func__); 530 if (chdir("/") == -1) 531 fatal("%s: chdir(\"/\")", __func__); 532 533 privsep_process = p->p_id; 534 535 setproctitle("%s", p->p_title); 536 537 if (setgroups(1, &pw->pw_gid) || 538 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 539 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 540 fatal("%s: cannot drop privileges", __func__); 541 542 event_init(); 543 544 signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p); 545 signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p); 546 signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p); 547 signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p); 548 signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p); 549 signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p); 550 551 signal_add(&ps->ps_evsigint, NULL); 552 signal_add(&ps->ps_evsigterm, NULL); 553 signal_add(&ps->ps_evsigchld, NULL); 554 signal_add(&ps->ps_evsighup, NULL); 555 signal_add(&ps->ps_evsigpipe, NULL); 556 signal_add(&ps->ps_evsigusr1, NULL); 557 558 proc_setup(ps, procs, nproc); 559 proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0); 560 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 561 if (control_listen(&ps->ps_csock) == -1) 562 fatalx("%s: control_listen", __func__); 563 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 564 if (control_listen(rcs) == -1) 565 fatalx("%s: control_listen", __func__); 566 } 567 568 DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title, 569 ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid()); 570 571 if (run != NULL) 572 run(ps, p, arg); 573 574 event_dispatch(); 575 576 proc_shutdown(p); 577} 578 579void 580proc_dispatch(int fd, short event, void *arg) 581{ 582 struct imsgev *iev = arg; 583 struct privsep_proc *p = iev->proc; 584 struct privsep *ps = p->p_ps; 585 struct imsgbuf *ibuf; 586 struct imsg imsg; 587 ssize_t n; 588 int verbose; 589 const char *title; 590 struct privsep_fd pf; 591 592 title = ps->ps_title[privsep_process]; 593 ibuf = &iev->ibuf; 594 595 if (event & EV_READ) { 596 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 597 fatal("%s: imsg_read", __func__); 598 if (n == 0) { 599 /* this pipe is dead, so remove the event handler */ 600 event_del(&iev->ev); 601 event_loopexit(NULL); 602 return; 603 } 604 } 605 606 if (event & EV_WRITE) { 607 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 608 fatal("%s: msgbuf_write", __func__); 609 if (n == 0) { 610 /* this pipe is dead, so remove the event handler */ 611 event_del(&iev->ev); 612 event_loopexit(NULL); 613 return; 614 } 615 } 616 617 for (;;) { 618 if ((n = imsg_get(ibuf, &imsg)) == -1) 619 fatal("%s: imsg_get", __func__); 620 if (n == 0) 621 break; 622 623#if DEBUG > 1 624 log_debug("%s: %s %d got imsg %d peerid %d from %s %d", 625 __func__, title, ps->ps_instance + 1, 626 imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid); 627#endif 628 629 /* 630 * Check the message with the program callback 631 */ 632 if ((p->p_cb)(fd, p, &imsg) == 0) { 633 /* Message was handled by the callback, continue */ 634 imsg_free(&imsg); 635 continue; 636 } 637 638 /* 639 * Generic message handling 640 */ 641 switch (imsg.hdr.type) { 642 case IMSG_CTL_VERBOSE: 643 IMSG_SIZE_CHECK(&imsg, &verbose); 644 memcpy(&verbose, imsg.data, sizeof(verbose)); 645 log_setverbose(verbose); 646 break; 647 case IMSG_CTL_PROCFD: 648 IMSG_SIZE_CHECK(&imsg, &pf); 649 memcpy(&pf, imsg.data, sizeof(pf)); 650 proc_accept(ps, imsg_get_fd(&imsg), pf.pf_procid, 651 pf.pf_instance); 652 break; 653 default: 654 fatalx("%s: %s %d got invalid imsg %d peerid %d " 655 "from %s %d", 656 __func__, title, ps->ps_instance + 1, 657 imsg.hdr.type, imsg.hdr.peerid, 658 p->p_title, imsg.hdr.pid); 659 } 660 imsg_free(&imsg); 661 } 662 imsg_event_add(iev); 663} 664 665int 666proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg) 667{ 668 return (-1); 669} 670 671/* 672 * imsg helper functions 673 */ 674void 675imsg_event_add(struct imsgev *iev) 676{ 677 imsg_event_add2(iev, NULL); 678} 679 680void 681imsg_event_add2(struct imsgev *iev, struct event_base *ev_base) 682{ 683 if (iev->handler == NULL) { 684 imsg_flush(&iev->ibuf); 685 return; 686 } 687 688 iev->events = EV_READ; 689 if (iev->ibuf.w.queued) 690 iev->events |= EV_WRITE; 691 692 event_del(&iev->ev); 693 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 694 if (ev_base != NULL) 695 event_base_set(ev_base, &iev->ev); 696 event_add(&iev->ev, NULL); 697} 698 699int 700imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 701 pid_t pid, int fd, void *data, uint16_t datalen) 702{ 703 return imsg_compose_event2(iev, type, peerid, pid, fd, data, datalen, 704 NULL); 705} 706 707int 708imsg_compose_event2(struct imsgev *iev, uint16_t type, uint32_t peerid, 709 pid_t pid, int fd, void *data, uint16_t datalen, struct event_base *ev_base) 710{ 711 int ret; 712 713 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 714 pid, fd, data, datalen)) == -1) 715 return (ret); 716 imsg_event_add2(iev, ev_base); 717 return (ret); 718} 719 720int 721imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 722 pid_t pid, int fd, const struct iovec *iov, int iovcnt) 723{ 724 int ret; 725 726 if ((ret = imsg_composev(&iev->ibuf, type, peerid, 727 pid, fd, iov, iovcnt)) == -1) 728 return (ret); 729 imsg_event_add(iev); 730 return (ret); 731} 732 733void 734proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m) 735{ 736 if (*n == -1) { 737 /* Use a range of all target instances */ 738 *n = 0; 739 *m = ps->ps_instances[id]; 740 } else { 741 /* Use only a single slot of the specified peer process */ 742 *m = *n + 1; 743 } 744} 745 746int 747proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n, 748 uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen) 749{ 750 int m; 751 752 proc_range(ps, id, &n, &m); 753 for (; n < m; n++) { 754 if (imsg_compose_event(&ps->ps_ievs[id][n], 755 type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1) 756 return (-1); 757 } 758 759 return (0); 760} 761 762int 763proc_compose(struct privsep *ps, enum privsep_procid id, 764 uint16_t type, void *data, uint16_t datalen) 765{ 766 return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen)); 767} 768 769int 770proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n, 771 uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt) 772{ 773 int m; 774 775 proc_range(ps, id, &n, &m); 776 for (; n < m; n++) 777 if (imsg_composev_event(&ps->ps_ievs[id][n], 778 type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1) 779 return (-1); 780 781 return (0); 782} 783 784int 785proc_composev(struct privsep *ps, enum privsep_procid id, 786 uint16_t type, const struct iovec *iov, int iovcnt) 787{ 788 return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt)); 789} 790 791int 792proc_forward_imsg(struct privsep *ps, struct imsg *imsg, 793 enum privsep_procid id, int n) 794{ 795 return (proc_compose_imsg(ps, id, n, imsg->hdr.type, 796 imsg->hdr.peerid, imsg_get_fd(imsg), imsg->data, 797 IMSG_DATA_SIZE(imsg))); 798} 799 800struct imsgbuf * 801proc_ibuf(struct privsep *ps, enum privsep_procid id, int n) 802{ 803 int m; 804 805 proc_range(ps, id, &n, &m); 806 return (&ps->ps_ievs[id][n].ibuf); 807} 808 809struct imsgev * 810proc_iev(struct privsep *ps, enum privsep_procid id, int n) 811{ 812 int m; 813 814 proc_range(ps, id, &n, &m); 815 return (&ps->ps_ievs[id][n]); 816} 817 818/* This function should only be called with care as it breaks async I/O */ 819int 820proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n) 821{ 822 struct imsgbuf *ibuf; 823 int m, ret = 0; 824 825 proc_range(ps, id, &n, &m); 826 for (; n < m; n++) { 827 if ((ibuf = proc_ibuf(ps, id, n)) == NULL) 828 return (-1); 829 do { 830 ret = imsg_flush(ibuf); 831 } while (ret == -1 && errno == EAGAIN); 832 if (ret == -1) 833 break; 834 imsg_event_add(&ps->ps_ievs[id][n]); 835 } 836 837 return (ret); 838} 839