1 /* $OpenBSD: proc.c,v 1.26 2019/01/08 15:38:36 bluhm 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 "snmpd.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 || (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 pa = &ps->ps_pipes[src][i]; 423 pb = &ps->ps_pipes[dst][j]; 424 if (socketpair(AF_UNIX, 425 SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 426 PF_UNSPEC, fds) == -1) 427 fatal("%s: socketpair", __func__); 428 429 pa->pp_pipes[dst][j] = fds[0]; 430 pb->pp_pipes[src][i] = fds[1]; 431 432 pf.pf_procid = src; 433 pf.pf_instance = i; 434 if (proc_compose_imsg(ps, dst, j, IMSG_CTL_PROCFD, 435 -1, pb->pp_pipes[src][i], &pf, sizeof(pf)) == -1) 436 fatal("%s: proc_compose_imsg", __func__); 437 438 pf.pf_procid = dst; 439 pf.pf_instance = j; 440 if (proc_compose_imsg(ps, src, i, IMSG_CTL_PROCFD, 441 -1, pa->pp_pipes[dst][j], &pf, sizeof(pf)) == -1) 442 fatal("%s: proc_compose_imsg", __func__); 443 444 /* 445 * We have to flush to send the descriptors and close 446 * them to avoid the fd ramp on startup. 447 */ 448 if (proc_flush_imsg(ps, src, i) == -1 || 449 proc_flush_imsg(ps, dst, j) == -1) 450 fatal("%s: imsg_flush", __func__); 451 } 452 } 453 } 454 455 void 456 proc_close(struct privsep *ps) 457 { 458 unsigned int dst, n; 459 struct privsep_pipes *pp; 460 461 if (ps == NULL) 462 return; 463 464 pp = ps->ps_pp; 465 466 for (dst = 0; dst < PROC_MAX; dst++) { 467 if (ps->ps_ievs[dst] == NULL) 468 continue; 469 470 for (n = 0; n < ps->ps_instances[dst]; n++) { 471 if (pp->pp_pipes[dst][n] == -1) 472 continue; 473 474 /* Cancel the fd, close and invalidate the fd */ 475 event_del(&(ps->ps_ievs[dst][n].ev)); 476 imsg_clear(&(ps->ps_ievs[dst][n].ibuf)); 477 close(pp->pp_pipes[dst][n]); 478 pp->pp_pipes[dst][n] = -1; 479 } 480 free(ps->ps_ievs[dst]); 481 } 482 } 483 484 void 485 proc_shutdown(struct privsep_proc *p) 486 { 487 struct privsep *ps = p->p_ps; 488 489 if (p->p_shutdown != NULL) 490 (*p->p_shutdown)(); 491 492 proc_close(ps); 493 494 log_info("%s exiting, pid %d", p->p_title, getpid()); 495 496 exit(0); 497 } 498 499 void 500 proc_sig_handler(int sig, short event, void *arg) 501 { 502 struct privsep_proc *p = arg; 503 504 switch (sig) { 505 case SIGINT: 506 case SIGTERM: 507 proc_shutdown(p); 508 break; 509 case SIGCHLD: 510 case SIGHUP: 511 case SIGPIPE: 512 case SIGUSR1: 513 /* ignore */ 514 break; 515 default: 516 fatalx("%s: unexpected signal", __func__); 517 /* NOTREACHED */ 518 } 519 } 520 521 void 522 proc_run(struct privsep *ps, struct privsep_proc *p, 523 struct privsep_proc *procs, unsigned int nproc, 524 void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg) 525 { 526 struct passwd *pw; 527 const char *root; 528 struct control_sock *rcs; 529 530 log_procinit(p->p_title); 531 532 /* Set the process group of the current process */ 533 setpgid(0, 0); 534 535 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 536 if (control_init(ps, &ps->ps_csock) == -1) 537 fatalx("%s: control_init", __func__); 538 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 539 if (control_init(ps, rcs) == -1) 540 fatalx("%s: control_init", __func__); 541 } 542 543 /* Use non-standard user */ 544 if (p->p_pw != NULL) 545 pw = p->p_pw; 546 else 547 pw = ps->ps_pw; 548 549 /* Change root directory */ 550 if (p->p_chroot != NULL) 551 root = p->p_chroot; 552 else 553 root = pw->pw_dir; 554 555 if (chroot(root) == -1) 556 fatal("%s: chroot", __func__); 557 if (chdir("/") == -1) 558 fatal("%s: chdir(\"/\")", __func__); 559 560 privsep_process = p->p_id; 561 562 setproctitle("%s", p->p_title); 563 564 if (setgroups(1, &pw->pw_gid) || 565 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 566 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 567 fatal("%s: cannot drop privileges", __func__); 568 569 event_init(); 570 571 signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p); 572 signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p); 573 signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p); 574 signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p); 575 signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p); 576 signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p); 577 578 signal_add(&ps->ps_evsigint, NULL); 579 signal_add(&ps->ps_evsigterm, NULL); 580 signal_add(&ps->ps_evsigchld, NULL); 581 signal_add(&ps->ps_evsighup, NULL); 582 signal_add(&ps->ps_evsigpipe, NULL); 583 signal_add(&ps->ps_evsigusr1, NULL); 584 585 proc_setup(ps, procs, nproc); 586 proc_accept(ps, PROC_PARENT_SOCK_FILENO, PROC_PARENT, 0); 587 if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) { 588 TAILQ_INIT(&ctl_conns); 589 if (control_listen(&ps->ps_csock) == -1) 590 fatalx("%s: control_listen", __func__); 591 TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry) 592 if (control_listen(rcs) == -1) 593 fatalx("%s: control_listen", __func__); 594 } 595 596 DPRINTF("%s: %s %d/%d, pid %d", __func__, p->p_title, 597 ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid()); 598 599 if (run != NULL) 600 run(ps, p, arg); 601 602 event_dispatch(); 603 604 proc_shutdown(p); 605 } 606 607 void 608 proc_dispatch(int fd, short event, void *arg) 609 { 610 struct imsgev *iev = arg; 611 struct privsep_proc *p = iev->proc; 612 struct privsep *ps = p->p_ps; 613 struct imsgbuf *ibuf; 614 struct imsg imsg; 615 ssize_t n; 616 int verbose; 617 const char *title; 618 struct privsep_fd pf; 619 620 title = ps->ps_title[privsep_process]; 621 ibuf = &iev->ibuf; 622 623 if (event & EV_READ) { 624 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 625 fatal("%s: imsg_read", __func__); 626 if (n == 0) { 627 /* this pipe is dead, so remove the event handler */ 628 event_del(&iev->ev); 629 event_loopexit(NULL); 630 return; 631 } 632 } 633 634 if (event & EV_WRITE) { 635 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 636 fatal("%s: msgbuf_write", __func__); 637 if (n == 0) { 638 /* this pipe is dead, so remove the event handler */ 639 event_del(&iev->ev); 640 event_loopexit(NULL); 641 return; 642 } 643 } 644 645 for (;;) { 646 if ((n = imsg_get(ibuf, &imsg)) == -1) 647 fatal("%s: imsg_get", __func__); 648 if (n == 0) 649 break; 650 651 #if DEBUG > 1 652 log_debug("%s: %s %d got imsg %d peerid %d from %s %d", 653 __func__, title, ps->ps_instance + 1, 654 imsg.hdr.type, imsg.hdr.peerid, p->p_title, imsg.hdr.pid); 655 #endif 656 657 /* 658 * Check the message with the program callback 659 */ 660 if ((p->p_cb)(fd, p, &imsg) == 0) { 661 /* Message was handled by the callback, continue */ 662 imsg_free(&imsg); 663 continue; 664 } 665 666 /* 667 * Generic message handling 668 */ 669 switch (imsg.hdr.type) { 670 case IMSG_CTL_VERBOSE: 671 IMSG_SIZE_CHECK(&imsg, &verbose); 672 memcpy(&verbose, imsg.data, sizeof(verbose)); 673 log_setverbose(verbose); 674 break; 675 case IMSG_CTL_PROCFD: 676 IMSG_SIZE_CHECK(&imsg, &pf); 677 memcpy(&pf, imsg.data, sizeof(pf)); 678 proc_accept(ps, imsg.fd, pf.pf_procid, 679 pf.pf_instance); 680 break; 681 default: 682 fatalx("%s: %s %d got invalid imsg %d peerid %d " 683 "from %s %d", 684 __func__, title, ps->ps_instance + 1, 685 imsg.hdr.type, imsg.hdr.peerid, 686 p->p_title, imsg.hdr.pid); 687 } 688 imsg_free(&imsg); 689 } 690 imsg_event_add(iev); 691 } 692 693 int 694 proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg) 695 { 696 return (-1); 697 } 698 699 /* 700 * imsg helper functions 701 */ 702 703 void 704 imsg_event_add(struct imsgev *iev) 705 { 706 if (iev->handler == NULL) { 707 imsg_flush(&iev->ibuf); 708 return; 709 } 710 711 iev->events = EV_READ; 712 if (iev->ibuf.w.queued) 713 iev->events |= EV_WRITE; 714 715 event_del(&iev->ev); 716 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data); 717 event_add(&iev->ev, NULL); 718 } 719 720 int 721 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 722 pid_t pid, int fd, void *data, uint16_t datalen) 723 { 724 int ret; 725 726 if ((ret = imsg_compose(&iev->ibuf, type, peerid, 727 pid, fd, data, datalen)) == -1) 728 return (ret); 729 imsg_event_add(iev); 730 return (ret); 731 } 732 733 int 734 imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 735 pid_t pid, int fd, const struct iovec *iov, int iovcnt) 736 { 737 int ret; 738 739 if ((ret = imsg_composev(&iev->ibuf, type, peerid, 740 pid, fd, iov, iovcnt)) == -1) 741 return (ret); 742 imsg_event_add(iev); 743 return (ret); 744 } 745 746 void 747 proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m) 748 { 749 if (*n == -1) { 750 /* Use a range of all target instances */ 751 *n = 0; 752 *m = ps->ps_instances[id]; 753 } else { 754 /* Use only a single slot of the specified peer process */ 755 *m = *n + 1; 756 } 757 } 758 759 int 760 proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n, 761 uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen) 762 { 763 int m; 764 765 proc_range(ps, id, &n, &m); 766 for (; n < m; n++) { 767 if (imsg_compose_event(&ps->ps_ievs[id][n], 768 type, peerid, ps->ps_instance + 1, fd, data, datalen) == -1) 769 return (-1); 770 } 771 772 return (0); 773 } 774 775 int 776 proc_compose(struct privsep *ps, enum privsep_procid id, 777 uint16_t type, void *data, uint16_t datalen) 778 { 779 return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen)); 780 } 781 782 int 783 proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n, 784 uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt) 785 { 786 int m; 787 788 proc_range(ps, id, &n, &m); 789 for (; n < m; n++) 790 if (imsg_composev_event(&ps->ps_ievs[id][n], 791 type, peerid, ps->ps_instance + 1, fd, iov, iovcnt) == -1) 792 return (-1); 793 794 return (0); 795 } 796 797 int 798 proc_composev(struct privsep *ps, enum privsep_procid id, 799 uint16_t type, const struct iovec *iov, int iovcnt) 800 { 801 return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt)); 802 } 803 804 int 805 proc_forward_imsg(struct privsep *ps, struct imsg *imsg, 806 enum privsep_procid id, int n) 807 { 808 return (proc_compose_imsg(ps, id, n, imsg->hdr.type, 809 imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg))); 810 } 811 812 struct imsgbuf * 813 proc_ibuf(struct privsep *ps, enum privsep_procid id, int n) 814 { 815 int m; 816 817 proc_range(ps, id, &n, &m); 818 return (&ps->ps_ievs[id][n].ibuf); 819 } 820 821 struct imsgev * 822 proc_iev(struct privsep *ps, enum privsep_procid id, int n) 823 { 824 int m; 825 826 proc_range(ps, id, &n, &m); 827 return (&ps->ps_ievs[id][n]); 828 } 829 830 /* This function should only be called with care as it breaks async I/O */ 831 int 832 proc_flush_imsg(struct privsep *ps, enum privsep_procid id, int n) 833 { 834 struct imsgbuf *ibuf; 835 int m, ret = 0; 836 837 proc_range(ps, id, &n, &m); 838 for (; n < m; n++) { 839 if ((ibuf = proc_ibuf(ps, id, n)) == NULL) 840 return (-1); 841 do { 842 ret = imsg_flush(ibuf); 843 } while (ret == -1 && errno == EAGAIN); 844 if (ret == -1) 845 break; 846 imsg_event_add(&ps->ps_ievs[id][n]); 847 } 848 849 return (ret); 850 } 851