1 /* $OpenBSD: proc.c,v 1.41 2021/12/04 06:52:58 florian 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 "httpd.h" 38 39 void proc_exec(struct privsep *, struct privsep_proc *, unsigned int, int, 40 int, 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 debug, 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 /* First create a new session */ 134 if (setsid() == -1) 135 fatal("setsid"); 136 137 /* Prepare parent socket. */ 138 if (fd != PROC_PARENT_SOCK_FILENO) { 139 if (dup2(fd, PROC_PARENT_SOCK_FILENO) 140 == -1) 141 fatal("dup2"); 142 } else if (fcntl(fd, F_SETFD, 0) == -1) 143 fatal("fcntl"); 144 145 /* Daemons detach from terminal. */ 146 if (!debug && (fd = 147 open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 148 (void)dup2(fd, STDIN_FILENO); 149 (void)dup2(fd, STDOUT_FILENO); 150 (void)dup2(fd, STDERR_FILENO); 151 if (fd > 2) 152 (void)close(fd); 153 } 154 155 execvp(argv[0], nargv); 156 fatal("%s: execvp", __func__); 157 break; 158 default: 159 /* Close child end. */ 160 close(fd); 161 break; 162 } 163 } 164 } 165 free(nargv); 166 } 167 168 void 169 proc_connect(struct privsep *ps) 170 { 171 struct imsgev *iev; 172 unsigned int src, dst, inst; 173 174 /* Don't distribute any sockets if we are not really going to run. */ 175 if (ps->ps_noaction) 176 return; 177 178 for (dst = 0; dst < PROC_MAX; dst++) { 179 /* We don't communicate with ourselves. */ 180 if (dst == PROC_PARENT) 181 continue; 182 183 for (inst = 0; inst < ps->ps_instances[dst]; inst++) { 184 iev = &ps->ps_ievs[dst][inst]; 185 imsg_init(&iev->ibuf, ps->ps_pp->pp_pipes[dst][inst]); 186 event_set(&iev->ev, iev->ibuf.fd, iev->events, 187 iev->handler, iev->data); 188 event_add(&iev->ev, NULL); 189 } 190 } 191 192 /* Distribute the socketpair()s for everyone. */ 193 for (src = 0; src < PROC_MAX; src++) 194 for (dst = src; dst < PROC_MAX; dst++) { 195 /* Parent already distributed its fds. */ 196 if (src == PROC_PARENT || dst == PROC_PARENT) 197 continue; 198 199 proc_open(ps, src, dst); 200 } 201 } 202 203 void 204 proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc, 205 int debug, int argc, char **argv, enum privsep_procid proc_id) 206 { 207 struct privsep_proc *p = NULL; 208 struct privsep_pipes *pa, *pb; 209 unsigned int proc; 210 unsigned int dst; 211 int fds[2]; 212 213 /* Don't initiate anything if we are not really going to run. */ 214 if (ps->ps_noaction) 215 return; 216 217 if (proc_id == PROC_PARENT) { 218 privsep_process = PROC_PARENT; 219 proc_setup(ps, procs, nproc); 220 221 /* 222 * Create the children sockets so we can use them 223 * to distribute the rest of the socketpair()s using 224 * proc_connect() later. 225 */ 226 for (dst = 0; dst < PROC_MAX; dst++) { 227 /* Don't create socket for ourselves. */ 228 if (dst == PROC_PARENT) 229 continue; 230 231 for (proc = 0; proc < ps->ps_instances[dst]; proc++) { 232 pa = &ps->ps_pipes[PROC_PARENT][0]; 233 pb = &ps->ps_pipes[dst][proc]; 234 if (socketpair(AF_UNIX, 235 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 236 PF_UNSPEC, fds) == -1) 237 fatal("%s: socketpair", __func__); 238 239 pa->pp_pipes[dst][proc] = fds[0]; 240 pb->pp_pipes[PROC_PARENT][0] = fds[1]; 241 } 242 } 243 244 /* Engage! */ 245 proc_exec(ps, procs, nproc, debug, argc, argv); 246 return; 247 } 248 249 /* Initialize a child */ 250 for (proc = 0; proc < nproc; proc++) { 251 if (procs[proc].p_id != proc_id) 252 continue; 253 p = &procs[proc]; 254 break; 255 } 256 if (p == NULL || p->p_init == NULL) 257 fatalx("%s: process %d missing process initialization", 258 __func__, proc_id); 259 260 p->p_init(ps, p); 261 262 fatalx("failed to initiate child process"); 263 } 264 265 void 266 proc_accept(struct privsep *ps, int fd, enum privsep_procid dst, 267 unsigned int n) 268 { 269 struct privsep_pipes *pp = ps->ps_pp; 270 struct imsgev *iev; 271 272 if (ps->ps_ievs[dst] == NULL) { 273 #if DEBUG > 1 274 log_debug("%s: %s src %d %d to dst %d %d not connected", 275 __func__, ps->ps_title[privsep_process], 276 privsep_process, ps->ps_instance + 1, 277 dst, n + 1); 278 #endif 279 close(fd); 280 return; 281 } 282 283 if (pp->pp_pipes[dst][n] != -1) { 284 log_warnx("%s: duplicated descriptor", __func__); 285 close(fd); 286 return; 287 } else 288 pp->pp_pipes[dst][n] = fd; 289 290 iev = &ps->ps_ievs[dst][n]; 291 imsg_init(&iev->ibuf, fd); 292 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 293 event_add(&iev->ev, NULL); 294 } 295 296 void 297 proc_setup(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc) 298 { 299 unsigned int i, j, src, dst, id; 300 struct privsep_pipes *pp; 301 302 /* Initialize parent title, ps_instances and procs. */ 303 ps->ps_title[PROC_PARENT] = "parent"; 304 305 for (src = 0; src < PROC_MAX; src++) 306 /* Default to 1 process instance */ 307 if (ps->ps_instances[src] < 1) 308 ps->ps_instances[src] = 1; 309 310 for (src = 0; src < nproc; src++) { 311 procs[src].p_ps = ps; 312 if (procs[src].p_cb == NULL) 313 procs[src].p_cb = proc_dispatch_null; 314 315 id = procs[src].p_id; 316 ps->ps_title[id] = procs[src].p_title; 317 if ((ps->ps_ievs[id] = calloc(ps->ps_instances[id], 318 sizeof(struct imsgev))) == NULL) 319 fatal("%s: calloc", __func__); 320 321 /* With this set up, we are ready to call imsg_init(). */ 322 for (i = 0; i < ps->ps_instances[id]; i++) { 323 ps->ps_ievs[id][i].handler = proc_dispatch; 324 ps->ps_ievs[id][i].events = EV_READ; 325 ps->ps_ievs[id][i].proc = &procs[src]; 326 ps->ps_ievs[id][i].data = &ps->ps_ievs[id][i]; 327 } 328 } 329 330 /* 331 * Allocate pipes for all process instances (incl. parent) 332 * 333 * - ps->ps_pipes: N:M mapping 334 * N source processes connected to M destination processes: 335 * [src][instances][dst][instances], for example 336 * [PROC_RELAY][3][PROC_CA][3] 337 * 338 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes 339 * Each process instance has a destination array of socketpair fds: 340 * [dst][instances], for example 341 * [PROC_PARENT][0] 342 */ 343 for (src = 0; src < PROC_MAX; src++) { 344 /* Allocate destination array for each process */ 345 if ((ps->ps_pipes[src] = calloc(ps->ps_instances[src], 346 sizeof(struct privsep_pipes))) == NULL) 347 fatal("%s: calloc", __func__); 348 349 for (i = 0; i < ps->ps_instances[src]; i++) { 350 pp = &ps->ps_pipes[src][i]; 351 352 for (dst = 0; dst < PROC_MAX; dst++) { 353 /* Allocate maximum fd integers */ 354 if ((pp->pp_pipes[dst] = 355 calloc(ps->ps_instances[dst], 356 sizeof(int))) == NULL) 357 fatal("%s: calloc", __func__); 358 359 /* Mark fd as unused */ 360 for (j = 0; j < ps->ps_instances[dst]; j++) 361 pp->pp_pipes[dst][j] = -1; 362 } 363 } 364 } 365 366 ps->ps_pp = &ps->ps_pipes[privsep_process][ps->ps_instance]; 367 } 368 369 void 370 proc_kill(struct privsep *ps) 371 { 372 char *cause; 373 pid_t pid; 374 int len, status; 375 376 if (privsep_process != PROC_PARENT) 377 return; 378 379 proc_close(ps); 380 381 do { 382 pid = waitpid(WAIT_ANY, &status, 0); 383 if (pid <= 0) 384 continue; 385 386 if (WIFSIGNALED(status)) { 387 len = asprintf(&cause, "terminated; signal %d", 388 WTERMSIG(status)); 389 } else if (WIFEXITED(status)) { 390 if (WEXITSTATUS(status) != 0) 391 len = asprintf(&cause, "exited abnormally"); 392 else 393 len = 0; 394 } else 395 len = -1; 396 397 if (len == 0) { 398 /* child exited OK, don't print a warning message */ 399 } else if (len != -1) { 400 log_warnx("lost child: pid %u %s", pid, cause); 401 free(cause); 402 } else 403 log_warnx("lost child: pid %u", pid); 404 } while (pid != -1 || errno == EINTR); 405 } 406 407 void 408 proc_open(struct privsep *ps, int src, int dst) 409 { 410 struct privsep_pipes *pa, *pb; 411 struct privsep_fd pf; 412 int fds[2]; 413 unsigned int i, j; 414 415 /* Exchange pipes between process. */ 416 for (i = 0; i < ps->ps_instances[src]; i++) { 417 for (j = 0; j < ps->ps_instances[dst]; j++) { 418 /* Don't create sockets for ourself. */ 419 if (src == dst && i == j) 420 continue; 421 422 /* Servers don't talk to each other. */ 423 if (src == PROC_SERVER && dst == PROC_SERVER) 424 continue; 425 426 pa = &ps->ps_pipes[src][i]; 427 pb = &ps->ps_pipes[dst][j]; 428 if (socketpair(AF_UNIX, 429 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 430 PF_UNSPEC, fds) == -1) 431 fatal("%s: socketpair", __func__); 432 433 pa->pp_pipes[dst][j] = fds[0]; 434 pb->pp_pipes[src][i] = fds[1]; 435 436 pf.pf_procid = src; 437 pf.pf_instance = i; 438 if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD, 439 -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1) 440 fatal("%s: proc_compose_imsg", __func__); 441 442 pf.pf_procid = dst; 443 pf.pf_instance = j; 444 if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD, 445 -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1) 446 fatal("%s: proc_compose_imsg", __func__); 447 448 /* 449 * We have to flush to send the descriptors and close 450 * them to avoid the fd ramp on startup. 451 */ 452 if (proc_flush_imsg(ps, src, i) == -1 || 453 proc_flush_imsg(ps, dst, j) == -1) 454 fatal("%s: imsg_flush", __func__); 455 } 456 } 457 } 458 459 void 460 proc_close(struct privsep *ps) 461 { 462 unsigned int dst, n; 463 struct privsep_pipes *pp; 464 465 if (ps == NULL) 466 return; 467 468 pp = ps->ps_pp; 469 470 for (dst = 0; dst < PROC_MAX; dst++) { 471 if (ps->ps_ievs[dst] == NULL) 472 continue; 473 474 for (n = 0; n < ps->ps_instances[dst]; n++) { 475 if (pp->pp_pipes[dst][n] == -1) 476 continue; 477 478 /* Cancel the fd, close and invalidate the fd */ 479 event_del(&(ps->ps_ievs[dst][n].ev)); 480 imsg_clear(&(ps->ps_ievs[dst][n].ibuf)); 481 close(pp->pp_pipes[dst][n]); 482 pp->pp_pipes[dst][n] = -1; 483 } 484 free(ps->ps_ievs[dst]); 485 } 486 } 487 488 void 489 proc_shutdown(struct privsep_proc *p) 490 { 491 struct privsep *ps = p->p_ps; 492 493 if (p->p_id == PROC_CONTROL && ps) 494 control_cleanup(&ps->ps_csock); 495 496 if (p->p_shutdown != NULL) 497 (*p->p_shutdown)(); 498 499 proc_close(ps); 500 501 log_info("%s exiting, pid %d", p->p_title, getpid()); 502 503 exit(0); 504 } 505 506 void 507 proc_sig_handler(int sig, short event, void *arg) 508 { 509 struct privsep_proc *p = arg; 510 511 switch (sig) { 512 case SIGINT: 513 case SIGTERM: 514 proc_shutdown(p); 515 break; 516 case SIGCHLD: 517 case SIGHUP: 518 case SIGPIPE: 519 case SIGUSR1: 520 /* ignore */ 521 break; 522 default: 523 fatalx("%s: unexpected signal", __func__); 524 /* NOTREACHED */ 525 } 526 } 527 528 void 529 proc_run(struct privsep *ps, struct privsep_proc *p, 530 struct privsep_proc *procs, unsigned int nproc, 531 void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg) 532 { 533 struct passwd *pw; 534 const char *root; 535 struct control_sock *rcs; 536 537 log_procinit(p->p_title); 538 539 /* Set the process group of the current process */ 540 setpgid(0, 0); 541 542 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 543 if (control_init(ps, &ps->ps_csock) == -1) 544 fatalx("%s: control_init", __func__); 545 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 546 if (control_init(ps, rcs) == -1) 547 fatalx("%s: control_init", __func__); 548 } 549 550 /* Use non-standard user */ 551 if (p->p_pw != NULL) 552 pw = p->p_pw; 553 else 554 pw = ps->ps_pw; 555 556 /* Change root directory */ 557 if (p->p_chroot != NULL) 558 root = p->p_chroot; 559 else 560 root = pw->pw_dir; 561 562 if (chroot(root) == -1) 563 fatal("%s: chroot", __func__); 564 if (chdir("/") == -1) 565 fatal("%s: chdir(\"/\")", __func__); 566 567 privsep_process = p->p_id; 568 569 setproctitle("%s", p->p_title); 570 571 if (setgroups(1, &pw->pw_gid) || 572 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 573 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 574 fatal("%s: cannot drop privileges", __func__); 575 576 event_init(); 577 578 signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p); 579 signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p); 580 signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p); 581 signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p); 582 signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p); 583 signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p); 584 585 signal_add(&ps->ps_evsigint, NULL); 586 signal_add(&ps->ps_evsigterm, NULL); 587 signal_add(&ps->ps_evsigchld, NULL); 588 signal_add(&ps->ps_evsighup, NULL); 589 signal_add(&ps->ps_evsigpipe, NULL); 590 signal_add(&ps->ps_evsigusr1, NULL); 591 592 proc_setup(ps, procs, nproc); 593 proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0); 594 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 595 if (control_listen(&ps->ps_csock) == -1) 596 fatalx("%s: control_listen", __func__); 597 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 598 if (control_listen(rcs) == -1) 599 fatalx("%s: control_listen", __func__); 600 } 601 602 DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title, 603 ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid()); 604 605 if (run != NULL) 606 run(ps, p, arg); 607 608 event_dispatch(); 609 610 proc_shutdown(p); 611 } 612 613 void 614 proc_dispatch(int fd, short event, void *arg) 615 { 616 struct imsgev *iev = arg; 617 struct privsep_proc *p = iev->proc; 618 struct privsep *ps = p->p_ps; 619 struct imsgbuf *ibuf; 620 struct imsg imsg; 621 ssize_t n; 622 int verbose; 623 const char *title; 624 struct privsep_fd pf; 625 626 title = ps->ps_title[privsep_process]; 627 ibuf = &iev->ibuf; 628 629 if (event & EV_READ) { 630 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 631 fatal("%s: imsg_read", __func__); 632 if (n == 0) { 633 /* this pipe is dead, so remove the event handler */ 634 event_del(&iev->ev); 635 event_loopexit(NULL); 636 return; 637 } 638 } 639 640 if (event & EV_WRITE) { 641 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 642 fatal("%s: msgbuf_write", __func__); 643 if (n == 0) { 644 /* this pipe is dead, so remove the event handler */ 645 event_del(&iev->ev); 646 event_loopexit(NULL); 647 return; 648 } 649 } 650 651 for (;;) { 652 if ((n = imsg_get(ibuf, &imsg)) == -1) 653 fatal("%s: imsg_get", __func__); 654 if (n == 0) 655 break; 656 657 #if DEBUG > 1 658 log_debug("%s: %s %d got imsg %d peerid %d from %s %d", 659 __func__, title, ps->ps_instance + 1, 660 imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid); 661 #endif 662 663 /* 664 * Check the message with the program callback 665 */ 666 if ((p->p_cb)(fd, p, &imsg) == 0) { 667 /* Message was handled by the callback, continue */ 668 imsg_free(&imsg); 669 continue; 670 } 671 672 /* 673 * Generic message handling 674 */ 675 switch (imsg.hdr.type) { 676 case IMSG_CTL_VERBOSE: 677 IMSG_SIZE_CHECK(&imsg, &verbose); 678 memcpy(&verbose, imsg.data, sizeof(verbose)); 679 log_setverbose(verbose); 680 break; 681 case IMSG_CTL_PROCFD: 682 IMSG_SIZE_CHECK(&imsg, &pf); 683 memcpy(&pf, imsg.data, sizeof(pf)); 684 proc_accept(ps, imsg.fd, pf.pf_procid, 685 pf.pf_instance); 686 break; 687 default: 688 fatalx("%s: %s %d got invalid imsg %d peerid %d " 689 "from %s %d", 690 __func__, title, ps->ps_instance + 1, 691 imsg.hdr.type, imsg.hdr.peerid, 692 p->p_title, imsg.hdr.pid); 693 } 694 imsg_free(&imsg); 695 } 696 imsg_event_add(iev); 697 } 698 699 int 700 proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg) 701 { 702 return (-1); 703 } 704 705 /* 706 * imsg helper functions 707 */ 708 709 void 710 imsg_event_add(struct imsgev *iev) 711 { 712 if (iev->handler == NULL) { 713 imsg_flush(&iev->ibuf); 714 return; 715 } 716 717 iev->events = EV_READ; 718 if (iev->ibuf.w.queued) 719 iev->events |= EV_WRITE; 720 721 event_del(&iev->ev); 722 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 723 event_add(&iev->ev, NULL); 724 } 725 726 int 727 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 728 pid_t pid, int fd, void *data, uint16_t datalen) 729 { 730 int ret; 731 732 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 733 pid, fd, data, datalen)) == -1) 734 return (ret); 735 imsg_event_add(iev); 736 return (ret); 737 } 738 739 int 740 imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 741 pid_t pid, int fd, const struct iovec *iov, int iovcnt) 742 { 743 int ret; 744 745 if ((ret = imsg_composev(&iev->ibuf, type, peerid, 746 pid, fd, iov, iovcnt)) == -1) 747 return (ret); 748 imsg_event_add(iev); 749 return (ret); 750 } 751 752 void 753 proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m) 754 { 755 if (*n == -1) { 756 /* Use a range of all target instances */ 757 *n = 0; 758 *m = ps->ps_instances[id]; 759 } else { 760 /* Use only a single slot of the specified peer process */ 761 *m = *n + 1; 762 } 763 } 764 765 int 766 proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n, 767 uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen) 768 { 769 int m; 770 771 proc_range(ps, id, &n, &m); 772 for (; n < m; n++) { 773 if (imsg_compose_event(&ps->ps_ievs[id][n], 774 type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1) 775 return (-1); 776 } 777 778 return (0); 779 } 780 781 int 782 proc_compose(struct privsep *ps, enum privsep_procid id, 783 uint16_t type, void *data, uint16_t datalen) 784 { 785 return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen)); 786 } 787 788 int 789 proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n, 790 uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt) 791 { 792 int m; 793 794 proc_range(ps, id, &n, &m); 795 for (; n < m; n++) 796 if (imsg_composev_event(&ps->ps_ievs[id][n], 797 type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1) 798 return (-1); 799 800 return (0); 801 } 802 803 int 804 proc_composev(struct privsep *ps, enum privsep_procid id, 805 uint16_t type, const struct iovec *iov, int iovcnt) 806 { 807 return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt)); 808 } 809 810 int 811 proc_forward_imsg(struct privsep *ps, struct imsg *imsg, 812 enum privsep_procid id, int n) 813 { 814 return (proc_compose_imsg(ps, id, n, imsg->hdr.type, 815 imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg))); 816 } 817 818 struct imsgbuf * 819 proc_ibuf(struct privsep *ps, enum privsep_procid id, int n) 820 { 821 int m; 822 823 proc_range(ps, id, &n, &m); 824 return (&ps->ps_ievs[id][n].ibuf); 825 } 826 827 struct imsgev * 828 proc_iev(struct privsep *ps, enum privsep_procid id, int n) 829 { 830 int m; 831 832 proc_range(ps, id, &n, &m); 833 return (&ps->ps_ievs[id][n]); 834 } 835 836 /* This function should only be called with care as it breaks async I/O */ 837 int 838 proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n) 839 { 840 struct imsgbuf *ibuf; 841 int m, ret = 0; 842 843 proc_range(ps, id, &n, &m); 844 for (; n < m; n++) { 845 if ((ibuf = proc_ibuf(ps, id, n)) == NULL) 846 return (-1); 847 do { 848 ret = imsg_flush(ibuf); 849 } while (ret == -1 && errno == EAGAIN); 850 if (ret == -1) 851 break; 852 imsg_event_add(&ps->ps_ievs[id][n]); 853 } 854 855 return (ret); 856 } 857