1 /* $OpenBSD: proc.c,v 1.43 2022/09/03 20:07:31 benno 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 int proc_ispeer(struct privsep_proc *, unsigned int, enum privsep_procid); 47 void proc_shutdown(struct privsep_proc *); 48 void proc_sig_handler(int, short, void *); 49 void proc_range(struct privsep *, enum privsep_procid, int *, int *); 50 int proc_dispatch_null(int, struct privsep_proc *, struct imsg *); 51 52 int 53 proc_ispeer(struct privsep_proc *procs, unsigned int nproc, 54 enum privsep_procid type) 55 { 56 unsigned int i; 57 58 for (i = 0; i < nproc; i++) 59 if (procs[i].p_id == type) 60 return (1); 61 return (0); 62 } 63 64 enum privsep_procid 65 proc_getid(struct privsep_proc *procs, unsigned int nproc, 66 const char *proc_name) 67 { 68 struct privsep_proc *p; 69 unsigned int proc; 70 71 for (proc = 0; proc < nproc; proc++) { 72 p = &procs[proc]; 73 if (strcmp(p->p_title, proc_name)) 74 continue; 75 76 return (p->p_id); 77 } 78 79 return (PROC_MAX); 80 } 81 82 void 83 proc_exec(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc, 84 int argc, char **argv) 85 { 86 unsigned int proc, nargc, i, proc_i; 87 char **nargv; 88 struct privsep_proc *p; 89 char num[32]; 90 int fd; 91 92 /* Prepare the new process argv. */ 93 nargv = calloc(argc + 5, sizeof(char *)); 94 if (nargv == NULL) 95 fatal("%s: calloc", __func__); 96 97 /* Copy call argument first. */ 98 nargc = 0; 99 nargv[nargc++] = argv[0]; 100 101 /* Set process name argument and save the position. */ 102 nargv[nargc++] = "-P"; 103 proc_i = nargc; 104 nargc++; 105 106 /* Point process instance arg to stack and copy the original args. */ 107 nargv[nargc++] = "-I"; 108 nargv[nargc++] = num; 109 for (i = 1; i < (unsigned int) argc; i++) 110 nargv[nargc++] = argv[i]; 111 112 nargv[nargc] = NULL; 113 114 for (proc = 0; proc < nproc; proc++) { 115 p = &procs[proc]; 116 117 /* Update args with process title. */ 118 nargv[proc_i] = (char *)(uintptr_t)p->p_title; 119 120 /* Fire children processes. */ 121 for (i = 0; i < ps->ps_instances[p->p_id]; i++) { 122 /* Update the process instance number. */ 123 snprintf(num, sizeof(num), "%u", i); 124 125 fd = ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0]; 126 ps->ps_pipes[p->p_id][i].pp_pipes[PROC_PARENT][0] = -1; 127 128 switch (fork()) { 129 case -1: 130 fatal("%s: fork", __func__); 131 break; 132 case 0: 133 /* Prepare parent socket. */ 134 if (fd != PROC_PARENT_SOCK_FILENO) { 135 if (dup2(fd, PROC_PARENT_SOCK_FILENO) 136 == -1) 137 fatal("dup2"); 138 } else if (fcntl(fd, F_SETFD, 0) == -1) 139 fatal("fcntl"); 140 141 execvp(argv[0], nargv); 142 fatal("%s: execvp", __func__); 143 break; 144 default: 145 /* Close child end. */ 146 close(fd); 147 break; 148 } 149 } 150 } 151 free(nargv); 152 } 153 154 void 155 proc_connect(struct privsep *ps) 156 { 157 struct imsgev *iev; 158 unsigned int src, dst, inst; 159 160 /* Don't distribute any sockets if we are not really going to run. */ 161 if (ps->ps_noaction) 162 return; 163 164 for (dst = 0; dst < PROC_MAX; dst++) { 165 /* We don't communicate with ourselves. */ 166 if (dst == PROC_PARENT) 167 continue; 168 169 for (inst = 0; inst < ps->ps_instances[dst]; inst++) { 170 iev = &ps->ps_ievs[dst][inst]; 171 imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]); 172 event_set(&iev->ev, iev->ibuf.fd, iev->events, 173 iev->handler, iev->data); 174 event_add(&iev->ev, NULL); 175 } 176 } 177 178 /* Distribute the socketpair()s for everyone. */ 179 for (src = 0; src < PROC_MAX; src++) 180 for (dst = src; dst < PROC_MAX; dst++) { 181 /* Parent already distributed its fds. */ 182 if (src == PROC_PARENT || dst == PROC_PARENT) 183 continue; 184 185 proc_open(ps, src, dst); 186 } 187 } 188 189 void 190 proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc, 191 int debug, int argc, char **argv, enum privsep_procid proc_id) 192 { 193 struct privsep_proc *p = NULL; 194 struct privsep_pipes *pa, *pb; 195 unsigned int proc; 196 unsigned int dst; 197 int fds[2]; 198 199 /* Don't initiate anything if we are not really going to run. */ 200 if (ps->ps_noaction) 201 return; 202 203 if (proc_id == PROC_PARENT) { 204 privsep_process = PROC_PARENT; 205 proc_setup(ps, procs, nproc); 206 207 if (!debug && daemon(1, 0) == -1) 208 fatal("failed to daemonize"); 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, 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 /* No need for CA to CA or RELAY to RELAY sockets. */ 412 if ((src == PROC_CA && dst == PROC_CA) || 413 (src == PROC_RELAY && dst == PROC_RELAY)) 414 continue; 415 416 pa = &ps->ps_pipes[src][i]; 417 pb = &ps->ps_pipes[dst][j]; 418 if (socketpair(AF_UNIX, 419 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 420 PF_UNSPEC, fds) == -1) 421 fatal("%s: socketpair", __func__); 422 423 pa->pp_pipes[dst][j] = fds[0]; 424 pb->pp_pipes[src][i] = fds[1]; 425 426 pf.pf_procid = src; 427 pf.pf_instance = i; 428 if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD, 429 -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1) 430 fatal("%s: proc_compose_imsg", __func__); 431 432 pf.pf_procid = dst; 433 pf.pf_instance = j; 434 if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD, 435 -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1) 436 fatal("%s: proc_compose_imsg", __func__); 437 438 /* 439 * We have to flush to send the descriptors and close 440 * them to avoid the fd ramp on startup. 441 */ 442 if (proc_flush_imsg(ps, src, i) == -1 || 443 proc_flush_imsg(ps, dst, j) == -1) 444 fatal("%s: imsg_flush", __func__); 445 } 446 } 447 } 448 449 void 450 proc_close(struct privsep *ps) 451 { 452 unsigned int dst, n; 453 struct privsep_pipes *pp; 454 455 if (ps == NULL) 456 return; 457 458 pp = ps->ps_pp; 459 460 for (dst = 0; dst < PROC_MAX; dst++) { 461 if (ps->ps_ievs[dst] == NULL) 462 continue; 463 464 for (n = 0; n < ps->ps_instances[dst]; n++) { 465 if (pp->pp_pipes[dst][n] == -1) 466 continue; 467 468 /* Cancel the fd, close and invalidate the fd */ 469 event_del(&(ps->ps_ievs[dst][n].ev)); 470 imsg_clear(&(ps->ps_ievs[dst][n].ibuf)); 471 close(pp->pp_pipes[dst][n]); 472 pp->pp_pipes[dst][n] = -1; 473 } 474 free(ps->ps_ievs[dst]); 475 } 476 } 477 478 void 479 proc_shutdown(struct privsep_proc *p) 480 { 481 struct privsep *ps = p->p_ps; 482 483 if (p->p_id == PROC_CONTROL && ps) 484 control_cleanup(&ps->ps_csock); 485 486 if (p->p_shutdown != NULL) 487 (*p->p_shutdown)(); 488 489 proc_close(ps); 490 491 log_info("%s exiting, pid %d", p->p_title, getpid()); 492 493 exit(0); 494 } 495 496 void 497 proc_sig_handler(int sig, short event, void *arg) 498 { 499 struct privsep_proc *p = arg; 500 501 switch (sig) { 502 case SIGINT: 503 case SIGTERM: 504 proc_shutdown(p); 505 break; 506 case SIGCHLD: 507 case SIGHUP: 508 case SIGPIPE: 509 case SIGUSR1: 510 /* ignore */ 511 break; 512 default: 513 fatalx("%s: unexpected signal", __func__); 514 /* NOTREACHED */ 515 } 516 } 517 518 void 519 proc_run(struct privsep *ps, struct privsep_proc *p, 520 struct privsep_proc *procs, unsigned int nproc, 521 void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg) 522 { 523 struct passwd *pw; 524 const char *root; 525 struct control_sock *rcs; 526 527 log_procinit(p->p_title); 528 529 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 530 if (control_init(ps, &ps->ps_csock) == -1) 531 fatalx("%s: control_init", __func__); 532 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 533 if (control_init(ps, rcs) == -1) 534 fatalx("%s: control_init", __func__); 535 } 536 537 /* Use non-standard user */ 538 if (p->p_pw != NULL) 539 pw = p->p_pw; 540 else 541 pw = ps->ps_pw; 542 543 /* Change root directory */ 544 if (p->p_chroot != NULL) 545 root = p->p_chroot; 546 else 547 root = pw->pw_dir; 548 549 if (chroot(root) == -1) 550 fatal("%s: chroot", __func__); 551 if (chdir("/") == -1) 552 fatal("%s: chdir(\"/\")", __func__); 553 554 privsep_process = p->p_id; 555 556 setproctitle("%s", p->p_title); 557 558 if (setgroups(1, &pw->pw_gid) || 559 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 560 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 561 fatal("%s: cannot drop privileges", __func__); 562 563 event_init(); 564 565 signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p); 566 signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p); 567 signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p); 568 signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p); 569 signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p); 570 signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p); 571 572 signal_add(&ps->ps_evsigint, NULL); 573 signal_add(&ps->ps_evsigterm, NULL); 574 signal_add(&ps->ps_evsigchld, NULL); 575 signal_add(&ps->ps_evsighup, NULL); 576 signal_add(&ps->ps_evsigpipe, NULL); 577 signal_add(&ps->ps_evsigusr1, NULL); 578 579 proc_setup(ps, procs, nproc); 580 proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0); 581 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 582 if (control_listen(&ps->ps_csock) == -1) 583 fatalx("%s: control_listen", __func__); 584 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 585 if (control_listen(rcs) == -1) 586 fatalx("%s: control_listen", __func__); 587 } 588 589 DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title, 590 ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid()); 591 592 if (run != NULL) 593 run(ps, p, arg); 594 595 event_dispatch(); 596 597 proc_shutdown(p); 598 } 599 600 void 601 proc_dispatch(int fd, short event, void *arg) 602 { 603 struct imsgev *iev = arg; 604 struct privsep_proc *p = iev->proc; 605 struct privsep *ps = p->p_ps; 606 struct imsgbuf *ibuf; 607 struct imsg imsg; 608 ssize_t n; 609 int verbose; 610 const char *title; 611 struct privsep_fd pf; 612 613 title = ps->ps_title[privsep_process]; 614 ibuf = &iev->ibuf; 615 616 if (event & EV_READ) { 617 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 618 fatal("%s: imsg_read", __func__); 619 if (n == 0) { 620 /* this pipe is dead, so remove the event handler */ 621 event_del(&iev->ev); 622 event_loopexit(NULL); 623 return; 624 } 625 } 626 627 if (event & EV_WRITE) { 628 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 629 fatal("%s: msgbuf_write", __func__); 630 if (n == 0) { 631 /* this pipe is dead, so remove the event handler */ 632 event_del(&iev->ev); 633 event_loopexit(NULL); 634 return; 635 } 636 } 637 638 for (;;) { 639 if ((n = imsg_get(ibuf, &imsg)) == -1) 640 fatal("%s: imsg_get", __func__); 641 if (n == 0) 642 break; 643 644 #if DEBUG > 1 645 log_debug("%s: %s %d got imsg %d peerid %d from %s %d", 646 __func__, title, ps->ps_instance + 1, 647 imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid); 648 #endif 649 650 /* 651 * Check the message with the program callback 652 */ 653 if ((p->p_cb)(fd, p, &imsg) == 0) { 654 /* Message was handled by the callback, continue */ 655 imsg_free(&imsg); 656 continue; 657 } 658 659 /* 660 * Generic message handling 661 */ 662 switch (imsg.hdr.type) { 663 case IMSG_CTL_VERBOSE: 664 IMSG_SIZE_CHECK(&imsg, &verbose); 665 memcpy(&verbose, imsg.data, sizeof(verbose)); 666 log_setverbose(verbose); 667 break; 668 case IMSG_CTL_PROCFD: 669 IMSG_SIZE_CHECK(&imsg, &pf); 670 memcpy(&pf, imsg.data, sizeof(pf)); 671 proc_accept(ps, imsg.fd, pf.pf_procid, 672 pf.pf_instance); 673 break; 674 default: 675 fatalx("%s: %s %d got invalid imsg %d peerid %d " 676 "from %s %d", 677 __func__, title, ps->ps_instance + 1, 678 imsg.hdr.type, imsg.hdr.peerid, 679 p->p_title, imsg.hdr.pid); 680 } 681 imsg_free(&imsg); 682 } 683 imsg_event_add(iev); 684 } 685 686 int 687 proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg) 688 { 689 return (-1); 690 } 691 692 /* 693 * imsg helper functions 694 */ 695 696 void 697 imsg_event_add(struct imsgev *iev) 698 { 699 if (iev->handler == NULL) { 700 imsg_flush(&iev->ibuf); 701 return; 702 } 703 704 iev->events = EV_READ; 705 if (iev->ibuf.w.queued) 706 iev->events |= EV_WRITE; 707 708 event_del(&iev->ev); 709 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 710 event_add(&iev->ev, NULL); 711 } 712 713 int 714 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 715 pid_t pid, int fd, void *data, uint16_t datalen) 716 { 717 int ret; 718 719 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 720 pid, fd, data, datalen)) == -1) 721 return (ret); 722 imsg_event_add(iev); 723 return (ret); 724 } 725 726 int 727 imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 728 pid_t pid, int fd, const struct iovec *iov, int iovcnt) 729 { 730 int ret; 731 732 if ((ret = imsg_composev(&iev->ibuf, type, peerid, 733 pid, fd, iov, iovcnt)) == -1) 734 return (ret); 735 imsg_event_add(iev); 736 return (ret); 737 } 738 739 void 740 proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m) 741 { 742 if (*n == -1) { 743 /* Use a range of all target instances */ 744 *n = 0; 745 *m = ps->ps_instances[id]; 746 } else { 747 /* Use only a single slot of the specified peer process */ 748 *m = *n + 1; 749 } 750 } 751 752 int 753 proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n, 754 uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen) 755 { 756 int m; 757 758 proc_range(ps, id, &n, &m); 759 for (; n < m; n++) { 760 if (imsg_compose_event(&ps->ps_ievs[id][n], 761 type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1) 762 return (-1); 763 } 764 765 return (0); 766 } 767 768 int 769 proc_compose(struct privsep *ps, enum privsep_procid id, 770 uint16_t type, void *data, uint16_t datalen) 771 { 772 return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen)); 773 } 774 775 int 776 proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n, 777 uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt) 778 { 779 int m; 780 781 proc_range(ps, id, &n, &m); 782 for (; n < m; n++) 783 if (imsg_composev_event(&ps->ps_ievs[id][n], 784 type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1) 785 return (-1); 786 787 return (0); 788 } 789 790 int 791 proc_composev(struct privsep *ps, enum privsep_procid id, 792 uint16_t type, const struct iovec *iov, int iovcnt) 793 { 794 return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt)); 795 } 796 797 int 798 proc_forward_imsg(struct privsep *ps, struct imsg *imsg, 799 enum privsep_procid id, int n) 800 { 801 return (proc_compose_imsg(ps, id, n, imsg->hdr.type, 802 imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg))); 803 } 804 805 struct imsgbuf * 806 proc_ibuf(struct privsep *ps, enum privsep_procid id, int n) 807 { 808 int m; 809 810 proc_range(ps, id, &n, &m); 811 return (&ps->ps_ievs[id][n].ibuf); 812 } 813 814 struct imsgev * 815 proc_iev(struct privsep *ps, enum privsep_procid id, int n) 816 { 817 int m; 818 819 proc_range(ps, id, &n, &m); 820 return (&ps->ps_ievs[id][n]); 821 } 822 823 /* This function should only be called with care as it breaks async I/O */ 824 int 825 proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n) 826 { 827 struct imsgbuf *ibuf; 828 int m, ret = 0; 829 830 proc_range(ps, id, &n, &m); 831 for (; n < m; n++) { 832 if ((ibuf = proc_ibuf(ps, id, n)) == NULL) 833 return (-1); 834 do { 835 ret = imsg_flush(ibuf); 836 } while (ret == -1 && errno == EAGAIN); 837 if (ret == -1) 838 break; 839 imsg_event_add(&ps->ps_ievs[id][n]); 840 } 841 842 return (ret); 843 } 844