1 /*- 2 * Copyright (c) 2002-2010 M. Warner Losh. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * my_system is a variation on lib/libc/stdlib/system.c: 27 * 28 * Copyright (c) 1988, 1993 29 * The Regents of the University of California. All rights reserved. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56 /* 57 * DEVD control daemon. 58 */ 59 60 // TODO list: 61 // o devd.conf and devd man pages need a lot of help: 62 // - devd needs to document the unix domain socket 63 // - devd.conf needs more details on the supported statements. 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include <sys/param.h> 69 #include <sys/socket.h> 70 #include <sys/stat.h> 71 #include <sys/sysctl.h> 72 #include <sys/types.h> 73 #include <sys/wait.h> 74 #include <sys/un.h> 75 76 #include <cctype> 77 #include <cerrno> 78 #include <cstdlib> 79 #include <cstdio> 80 #include <csignal> 81 #include <cstring> 82 #include <cstdarg> 83 84 #include <dirent.h> 85 #include <err.h> 86 #include <fcntl.h> 87 #include <libutil.h> 88 #include <paths.h> 89 #include <poll.h> 90 #include <regex.h> 91 #include <syslog.h> 92 #include <unistd.h> 93 94 #include <algorithm> 95 #include <map> 96 #include <string> 97 #include <list> 98 #include <vector> 99 100 #include "devd.h" /* C compatible definitions */ 101 #include "devd.hh" /* C++ class definitions */ 102 103 #define STREAMPIPE "/var/run/devd.pipe" 104 #define SEQPACKETPIPE "/var/run/devd.seqpacket.pipe" 105 #define CF "/etc/devd.conf" 106 #define SYSCTL "hw.bus.devctl_queue" 107 108 /* 109 * Since the client socket is nonblocking, we must increase its send buffer to 110 * handle brief event storms. On FreeBSD, AF_UNIX sockets don't have a receive 111 * buffer, so the client can't increase the buffersize by itself. 112 * 113 * For example, when creating a ZFS pool, devd emits one 165 character 114 * resource.fs.zfs.statechange message for each vdev in the pool. The kernel 115 * allocates a 4608B mbuf for each message. Modern technology places a limit of 116 * roughly 450 drives/rack, and it's unlikely that a zpool will ever be larger 117 * than that. 118 * 119 * 450 drives * 165 bytes / drive = 74250B of data in the sockbuf 120 * 450 drives * 4608B / drive = 2073600B of mbufs in the sockbuf 121 * 122 * We can't directly set the sockbuf's mbuf limit, but we can do it indirectly. 123 * The kernel sets it to the minimum of a hard-coded maximum value and sbcc * 124 * kern.ipc.sockbuf_waste_factor, where sbcc is the socket buffer size set by 125 * the user. The default value of kern.ipc.sockbuf_waste_factor is 8. If we 126 * set the bufsize to 256k and use the kern.ipc.sockbuf_waste_factor, then the 127 * kernel will set the mbuf limit to 2MB, which is just large enough for 450 128 * drives. It also happens to be the same as the hardcoded maximum value. 129 */ 130 #define CLIENT_BUFSIZE 262144 131 132 using namespace std; 133 134 typedef struct client { 135 int fd; 136 int socktype; 137 } client_t; 138 139 extern FILE *yyin; 140 extern int lineno; 141 142 static const char notify = '!'; 143 static const char nomatch = '?'; 144 static const char attach = '+'; 145 static const char detach = '-'; 146 147 static struct pidfh *pfh; 148 149 static int no_daemon = 0; 150 static int daemonize_quick = 0; 151 static int quiet_mode = 0; 152 static unsigned total_events = 0; 153 static volatile sig_atomic_t got_siginfo = 0; 154 static volatile sig_atomic_t romeo_must_die = 0; 155 156 static const char *configfile = CF; 157 158 static void devdlog(int priority, const char* message, ...) 159 __printflike(2, 3); 160 static void event_loop(void); 161 static void usage(void); 162 163 template <class T> void 164 delete_and_clear(vector<T *> &v) 165 { 166 typename vector<T *>::const_iterator i; 167 168 for (i = v.begin(); i != v.end(); ++i) 169 delete *i; 170 v.clear(); 171 } 172 173 config cfg; 174 175 event_proc::event_proc() : _prio(-1) 176 { 177 _epsvec.reserve(4); 178 } 179 180 event_proc::~event_proc() 181 { 182 delete_and_clear(_epsvec); 183 } 184 185 void 186 event_proc::add(eps *eps) 187 { 188 _epsvec.push_back(eps); 189 } 190 191 bool 192 event_proc::matches(config &c) const 193 { 194 vector<eps *>::const_iterator i; 195 196 for (i = _epsvec.begin(); i != _epsvec.end(); ++i) 197 if (!(*i)->do_match(c)) 198 return (false); 199 return (true); 200 } 201 202 bool 203 event_proc::run(config &c) const 204 { 205 vector<eps *>::const_iterator i; 206 207 for (i = _epsvec.begin(); i != _epsvec.end(); ++i) 208 if (!(*i)->do_action(c)) 209 return (false); 210 return (true); 211 } 212 213 action::action(const char *cmd) 214 : _cmd(cmd) 215 { 216 // nothing 217 } 218 219 action::~action() 220 { 221 // nothing 222 } 223 224 static int 225 my_system(const char *command) 226 { 227 pid_t pid, savedpid; 228 int pstat; 229 struct sigaction ign, intact, quitact; 230 sigset_t newsigblock, oldsigblock; 231 232 if (!command) /* just checking... */ 233 return (1); 234 235 /* 236 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save 237 * existing signal dispositions. 238 */ 239 ign.sa_handler = SIG_IGN; 240 ::sigemptyset(&ign.sa_mask); 241 ign.sa_flags = 0; 242 ::sigaction(SIGINT, &ign, &intact); 243 ::sigaction(SIGQUIT, &ign, &quitact); 244 ::sigemptyset(&newsigblock); 245 ::sigaddset(&newsigblock, SIGCHLD); 246 ::sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); 247 switch (pid = ::fork()) { 248 case -1: /* error */ 249 break; 250 case 0: /* child */ 251 /* 252 * Restore original signal dispositions and exec the command. 253 */ 254 ::sigaction(SIGINT, &intact, NULL); 255 ::sigaction(SIGQUIT, &quitact, NULL); 256 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 257 /* 258 * Close the PID file, and all other open descriptors. 259 * Inherit std{in,out,err} only. 260 */ 261 cfg.close_pidfile(); 262 ::closefrom(3); 263 ::execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); 264 ::_exit(127); 265 default: /* parent */ 266 savedpid = pid; 267 do { 268 pid = ::wait4(savedpid, &pstat, 0, (struct rusage *)0); 269 } while (pid == -1 && errno == EINTR); 270 break; 271 } 272 ::sigaction(SIGINT, &intact, NULL); 273 ::sigaction(SIGQUIT, &quitact, NULL); 274 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 275 return (pid == -1 ? -1 : pstat); 276 } 277 278 bool 279 action::do_action(config &c) 280 { 281 string s = c.expand_string(_cmd.c_str()); 282 devdlog(LOG_INFO, "Executing '%s'\n", s.c_str()); 283 my_system(s.c_str()); 284 return (true); 285 } 286 287 match::match(config &c, const char *var, const char *re) : 288 _inv(re[0] == '!'), 289 _var(var), 290 _re(c.expand_string(_inv ? re + 1 : re, "^", "$")) 291 { 292 regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE); 293 } 294 295 match::~match() 296 { 297 regfree(&_regex); 298 } 299 300 bool 301 match::do_match(config &c) 302 { 303 const string &value = c.get_variable(_var); 304 bool retval; 305 306 /* 307 * This function gets called WAY too often to justify calling syslog() 308 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 309 * can consume excessive amounts of systime inside of connect(). Only 310 * log when we're in -d mode. 311 */ 312 if (no_daemon) { 313 devdlog(LOG_DEBUG, "Testing %s=%s against %s, invert=%d\n", 314 _var.c_str(), value.c_str(), _re.c_str(), _inv); 315 } 316 317 retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0); 318 if (_inv == 1) 319 retval = (retval == 0) ? 1 : 0; 320 321 return (retval); 322 } 323 324 #include <sys/sockio.h> 325 #include <net/if.h> 326 #include <net/if_media.h> 327 328 media::media(config &, const char *var, const char *type) 329 : _var(var), _type(-1) 330 { 331 static struct ifmedia_description media_types[] = { 332 { IFM_ETHER, "Ethernet" }, 333 { IFM_TOKEN, "Tokenring" }, 334 { IFM_FDDI, "FDDI" }, 335 { IFM_IEEE80211, "802.11" }, 336 { IFM_ATM, "ATM" }, 337 { -1, "unknown" }, 338 { 0, NULL }, 339 }; 340 for (int i = 0; media_types[i].ifmt_string != NULL; ++i) 341 if (strcasecmp(type, media_types[i].ifmt_string) == 0) { 342 _type = media_types[i].ifmt_word; 343 break; 344 } 345 } 346 347 media::~media() 348 { 349 } 350 351 bool 352 media::do_match(config &c) 353 { 354 string value; 355 struct ifmediareq ifmr; 356 bool retval; 357 int s; 358 359 // Since we can be called from both a device attach/detach 360 // context where device-name is defined and what we want, 361 // as well as from a link status context, where subsystem is 362 // the name of interest, first try device-name and fall back 363 // to subsystem if none exists. 364 value = c.get_variable("device-name"); 365 if (value.empty()) 366 value = c.get_variable("subsystem"); 367 devdlog(LOG_DEBUG, "Testing media type of %s against 0x%x\n", 368 value.c_str(), _type); 369 370 retval = false; 371 372 s = socket(PF_INET, SOCK_DGRAM, 0); 373 if (s >= 0) { 374 memset(&ifmr, 0, sizeof(ifmr)); 375 strncpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name)); 376 377 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 && 378 ifmr.ifm_status & IFM_AVALID) { 379 devdlog(LOG_DEBUG, "%s has media type 0x%x\n", 380 value.c_str(), IFM_TYPE(ifmr.ifm_active)); 381 retval = (IFM_TYPE(ifmr.ifm_active) == _type); 382 } else if (_type == -1) { 383 devdlog(LOG_DEBUG, "%s has unknown media type\n", 384 value.c_str()); 385 retval = true; 386 } 387 close(s); 388 } 389 390 return (retval); 391 } 392 393 const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_"; 394 const string var_list::nothing = ""; 395 396 const string & 397 var_list::get_variable(const string &var) const 398 { 399 map<string, string>::const_iterator i; 400 401 i = _vars.find(var); 402 if (i == _vars.end()) 403 return (var_list::bogus); 404 return (i->second); 405 } 406 407 bool 408 var_list::is_set(const string &var) const 409 { 410 return (_vars.find(var) != _vars.end()); 411 } 412 413 void 414 var_list::set_variable(const string &var, const string &val) 415 { 416 /* 417 * This function gets called WAY too often to justify calling syslog() 418 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 419 * can consume excessive amounts of systime inside of connect(). Only 420 * log when we're in -d mode. 421 */ 422 if (no_daemon) 423 devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str()); 424 _vars[var] = val; 425 } 426 427 void 428 config::reset(void) 429 { 430 _dir_list.clear(); 431 delete_and_clear(_var_list_table); 432 delete_and_clear(_attach_list); 433 delete_and_clear(_detach_list); 434 delete_and_clear(_nomatch_list); 435 delete_and_clear(_notify_list); 436 } 437 438 void 439 config::parse_one_file(const char *fn) 440 { 441 devdlog(LOG_DEBUG, "Parsing %s\n", fn); 442 yyin = fopen(fn, "r"); 443 if (yyin == NULL) 444 err(1, "Cannot open config file %s", fn); 445 lineno = 1; 446 if (yyparse() != 0) 447 errx(1, "Cannot parse %s at line %d", fn, lineno); 448 fclose(yyin); 449 } 450 451 void 452 config::parse_files_in_dir(const char *dirname) 453 { 454 DIR *dirp; 455 struct dirent *dp; 456 char path[PATH_MAX]; 457 458 devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname); 459 dirp = opendir(dirname); 460 if (dirp == NULL) 461 return; 462 readdir(dirp); /* Skip . */ 463 readdir(dirp); /* Skip .. */ 464 while ((dp = readdir(dirp)) != NULL) { 465 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) { 466 snprintf(path, sizeof(path), "%s/%s", 467 dirname, dp->d_name); 468 parse_one_file(path); 469 } 470 } 471 closedir(dirp); 472 } 473 474 class epv_greater { 475 public: 476 int operator()(event_proc *const&l1, event_proc *const&l2) const 477 { 478 return (l1->get_priority() > l2->get_priority()); 479 } 480 }; 481 482 void 483 config::sort_vector(vector<event_proc *> &v) 484 { 485 stable_sort(v.begin(), v.end(), epv_greater()); 486 } 487 488 void 489 config::parse(void) 490 { 491 vector<string>::const_iterator i; 492 493 parse_one_file(configfile); 494 for (i = _dir_list.begin(); i != _dir_list.end(); ++i) 495 parse_files_in_dir((*i).c_str()); 496 sort_vector(_attach_list); 497 sort_vector(_detach_list); 498 sort_vector(_nomatch_list); 499 sort_vector(_notify_list); 500 } 501 502 void 503 config::open_pidfile() 504 { 505 pid_t otherpid; 506 507 if (_pidfile.empty()) 508 return; 509 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid); 510 if (pfh == NULL) { 511 if (errno == EEXIST) 512 errx(1, "devd already running, pid: %d", (int)otherpid); 513 warn("cannot open pid file"); 514 } 515 } 516 517 void 518 config::write_pidfile() 519 { 520 521 pidfile_write(pfh); 522 } 523 524 void 525 config::close_pidfile() 526 { 527 528 pidfile_close(pfh); 529 } 530 531 void 532 config::remove_pidfile() 533 { 534 535 pidfile_remove(pfh); 536 } 537 538 void 539 config::add_attach(int prio, event_proc *p) 540 { 541 p->set_priority(prio); 542 _attach_list.push_back(p); 543 } 544 545 void 546 config::add_detach(int prio, event_proc *p) 547 { 548 p->set_priority(prio); 549 _detach_list.push_back(p); 550 } 551 552 void 553 config::add_directory(const char *dir) 554 { 555 _dir_list.push_back(string(dir)); 556 } 557 558 void 559 config::add_nomatch(int prio, event_proc *p) 560 { 561 p->set_priority(prio); 562 _nomatch_list.push_back(p); 563 } 564 565 void 566 config::add_notify(int prio, event_proc *p) 567 { 568 p->set_priority(prio); 569 _notify_list.push_back(p); 570 } 571 572 void 573 config::set_pidfile(const char *fn) 574 { 575 _pidfile = fn; 576 } 577 578 void 579 config::push_var_table() 580 { 581 var_list *vl; 582 583 vl = new var_list(); 584 _var_list_table.push_back(vl); 585 devdlog(LOG_DEBUG, "Pushing table\n"); 586 } 587 588 void 589 config::pop_var_table() 590 { 591 delete _var_list_table.back(); 592 _var_list_table.pop_back(); 593 devdlog(LOG_DEBUG, "Popping table\n"); 594 } 595 596 void 597 config::set_variable(const char *var, const char *val) 598 { 599 _var_list_table.back()->set_variable(var, val); 600 } 601 602 const string & 603 config::get_variable(const string &var) 604 { 605 vector<var_list *>::reverse_iterator i; 606 607 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) { 608 if ((*i)->is_set(var)) 609 return ((*i)->get_variable(var)); 610 } 611 return (var_list::nothing); 612 } 613 614 bool 615 config::is_id_char(char ch) const 616 { 617 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' || 618 ch == '-')); 619 } 620 621 void 622 config::expand_one(const char *&src, string &dst) 623 { 624 int count; 625 string buffer; 626 627 src++; 628 // $$ -> $ 629 if (*src == '$') { 630 dst += *src++; 631 return; 632 } 633 634 // $(foo) -> $(foo) 635 // Not sure if I want to support this or not, so for now we just pass 636 // it through. 637 if (*src == '(') { 638 dst += '$'; 639 count = 1; 640 /* If the string ends before ) is matched , return. */ 641 while (count > 0 && *src) { 642 if (*src == ')') 643 count--; 644 else if (*src == '(') 645 count++; 646 dst += *src++; 647 } 648 return; 649 } 650 651 // $[^A-Za-z] -> $\1 652 if (!isalpha(*src)) { 653 dst += '$'; 654 dst += *src++; 655 return; 656 } 657 658 // $var -> replace with value 659 do { 660 buffer += *src++; 661 } while (is_id_char(*src)); 662 dst.append(get_variable(buffer)); 663 } 664 665 const string 666 config::expand_string(const char *src, const char *prepend, const char *append) 667 { 668 const char *var_at; 669 string dst; 670 671 /* 672 * 128 bytes is enough for 2427 of 2438 expansions that happen 673 * while parsing config files, as tested on 2013-01-30. 674 */ 675 dst.reserve(128); 676 677 if (prepend != NULL) 678 dst = prepend; 679 680 for (;;) { 681 var_at = strchr(src, '$'); 682 if (var_at == NULL) { 683 dst.append(src); 684 break; 685 } 686 dst.append(src, var_at - src); 687 src = var_at; 688 expand_one(src, dst); 689 } 690 691 if (append != NULL) 692 dst.append(append); 693 694 return (dst); 695 } 696 697 bool 698 config::chop_var(char *&buffer, char *&lhs, char *&rhs) const 699 { 700 char *walker; 701 702 if (*buffer == '\0') 703 return (false); 704 walker = lhs = buffer; 705 while (is_id_char(*walker)) 706 walker++; 707 if (*walker != '=') 708 return (false); 709 walker++; // skip = 710 if (*walker == '"') { 711 walker++; // skip " 712 rhs = walker; 713 while (*walker && *walker != '"') 714 walker++; 715 if (*walker != '"') 716 return (false); 717 rhs[-2] = '\0'; 718 *walker++ = '\0'; 719 } else { 720 rhs = walker; 721 while (*walker && !isspace(*walker)) 722 walker++; 723 if (*walker != '\0') 724 *walker++ = '\0'; 725 rhs[-1] = '\0'; 726 } 727 while (isspace(*walker)) 728 walker++; 729 buffer = walker; 730 return (true); 731 } 732 733 734 char * 735 config::set_vars(char *buffer) 736 { 737 char *lhs; 738 char *rhs; 739 740 while (1) { 741 if (!chop_var(buffer, lhs, rhs)) 742 break; 743 set_variable(lhs, rhs); 744 } 745 return (buffer); 746 } 747 748 void 749 config::find_and_execute(char type) 750 { 751 vector<event_proc *> *l; 752 vector<event_proc *>::const_iterator i; 753 const char *s; 754 755 switch (type) { 756 default: 757 return; 758 case notify: 759 l = &_notify_list; 760 s = "notify"; 761 break; 762 case nomatch: 763 l = &_nomatch_list; 764 s = "nomatch"; 765 break; 766 case attach: 767 l = &_attach_list; 768 s = "attach"; 769 break; 770 case detach: 771 l = &_detach_list; 772 s = "detach"; 773 break; 774 } 775 devdlog(LOG_DEBUG, "Processing %s event\n", s); 776 for (i = l->begin(); i != l->end(); ++i) { 777 if ((*i)->matches(*this)) { 778 (*i)->run(*this); 779 break; 780 } 781 } 782 783 } 784 785 786 static void 787 process_event(char *buffer) 788 { 789 char type; 790 char *sp; 791 792 sp = buffer + 1; 793 devdlog(LOG_INFO, "Processing event '%s'\n", buffer); 794 type = *buffer++; 795 cfg.push_var_table(); 796 // No match doesn't have a device, and the format is a little 797 // different, so handle it separately. 798 switch (type) { 799 case notify: 800 sp = cfg.set_vars(sp); 801 break; 802 case nomatch: 803 //? at location pnp-info on bus 804 sp = strchr(sp, ' '); 805 if (sp == NULL) 806 return; /* Can't happen? */ 807 *sp++ = '\0'; 808 while (isspace(*sp)) 809 sp++; 810 if (strncmp(sp, "at ", 3) == 0) 811 sp += 3; 812 sp = cfg.set_vars(sp); 813 while (isspace(*sp)) 814 sp++; 815 if (strncmp(sp, "on ", 3) == 0) 816 cfg.set_variable("bus", sp + 3); 817 break; 818 case attach: /*FALLTHROUGH*/ 819 case detach: 820 sp = strchr(sp, ' '); 821 if (sp == NULL) 822 return; /* Can't happen? */ 823 *sp++ = '\0'; 824 cfg.set_variable("device-name", buffer); 825 while (isspace(*sp)) 826 sp++; 827 if (strncmp(sp, "at ", 3) == 0) 828 sp += 3; 829 sp = cfg.set_vars(sp); 830 while (isspace(*sp)) 831 sp++; 832 if (strncmp(sp, "on ", 3) == 0) 833 cfg.set_variable("bus", sp + 3); 834 break; 835 } 836 837 cfg.find_and_execute(type); 838 cfg.pop_var_table(); 839 } 840 841 int 842 create_socket(const char *name, int socktype) 843 { 844 int fd, slen; 845 struct sockaddr_un sun; 846 847 if ((fd = socket(PF_LOCAL, socktype, 0)) < 0) 848 err(1, "socket"); 849 bzero(&sun, sizeof(sun)); 850 sun.sun_family = AF_UNIX; 851 strlcpy(sun.sun_path, name, sizeof(sun.sun_path)); 852 slen = SUN_LEN(&sun); 853 unlink(name); 854 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 855 err(1, "fcntl"); 856 if (::bind(fd, (struct sockaddr *) & sun, slen) < 0) 857 err(1, "bind"); 858 listen(fd, 4); 859 chown(name, 0, 0); /* XXX - root.wheel */ 860 chmod(name, 0666); 861 return (fd); 862 } 863 864 unsigned int max_clients = 10; /* Default, can be overridden on cmdline. */ 865 unsigned int num_clients; 866 867 list<client_t> clients; 868 869 void 870 notify_clients(const char *data, int len) 871 { 872 list<client_t>::iterator i; 873 874 /* 875 * Deliver the data to all clients. Throw clients overboard at the 876 * first sign of trouble. This reaps clients who've died or closed 877 * their sockets, and also clients who are alive but failing to keep up 878 * (or who are maliciously not reading, to consume buffer space in 879 * kernel memory or tie up the limited number of available connections). 880 */ 881 for (i = clients.begin(); i != clients.end(); ) { 882 int flags; 883 if (i->socktype == SOCK_SEQPACKET) 884 flags = MSG_EOR; 885 else 886 flags = 0; 887 888 if (send(i->fd, data, len, flags) != len) { 889 --num_clients; 890 close(i->fd); 891 i = clients.erase(i); 892 devdlog(LOG_WARNING, "notify_clients: send() failed; " 893 "dropping unresponsive client\n"); 894 } else 895 ++i; 896 } 897 } 898 899 void 900 check_clients(void) 901 { 902 int s; 903 struct pollfd pfd; 904 list<client_t>::iterator i; 905 906 /* 907 * Check all existing clients to see if any of them have disappeared. 908 * Normally we reap clients when we get an error trying to send them an 909 * event. This check eliminates the problem of an ever-growing list of 910 * zombie clients because we're never writing to them on a system 911 * without frequent device-change activity. 912 */ 913 pfd.events = 0; 914 for (i = clients.begin(); i != clients.end(); ) { 915 pfd.fd = i->fd; 916 s = poll(&pfd, 1, 0); 917 if ((s < 0 && s != EINTR ) || 918 (s > 0 && (pfd.revents & POLLHUP))) { 919 --num_clients; 920 close(i->fd); 921 i = clients.erase(i); 922 devdlog(LOG_NOTICE, "check_clients: " 923 "dropping disconnected client\n"); 924 } else 925 ++i; 926 } 927 } 928 929 void 930 new_client(int fd, int socktype) 931 { 932 client_t s; 933 int sndbuf_size; 934 935 /* 936 * First go reap any zombie clients, then accept the connection, and 937 * shut down the read side to stop clients from consuming kernel memory 938 * by sending large buffers full of data we'll never read. 939 */ 940 check_clients(); 941 s.socktype = socktype; 942 s.fd = accept(fd, NULL, NULL); 943 if (s.fd != -1) { 944 sndbuf_size = CLIENT_BUFSIZE; 945 if (setsockopt(s.fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, 946 sizeof(sndbuf_size))) 947 err(1, "setsockopt"); 948 shutdown(s.fd, SHUT_RD); 949 clients.push_back(s); 950 ++num_clients; 951 } else 952 err(1, "accept"); 953 } 954 955 static void 956 event_loop(void) 957 { 958 int rv; 959 int fd; 960 char buffer[DEVCTL_MAXBUF]; 961 int once = 0; 962 int stream_fd, seqpacket_fd, max_fd; 963 int accepting; 964 timeval tv; 965 fd_set fds; 966 967 fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC); 968 if (fd == -1) 969 err(1, "Can't open devctl device %s", PATH_DEVCTL); 970 stream_fd = create_socket(STREAMPIPE, SOCK_STREAM); 971 seqpacket_fd = create_socket(SEQPACKETPIPE, SOCK_SEQPACKET); 972 accepting = 1; 973 max_fd = max(fd, max(stream_fd, seqpacket_fd)) + 1; 974 while (!romeo_must_die) { 975 if (!once && !no_daemon && !daemonize_quick) { 976 // Check to see if we have any events pending. 977 tv.tv_sec = 0; 978 tv.tv_usec = 0; 979 FD_ZERO(&fds); 980 FD_SET(fd, &fds); 981 rv = select(fd + 1, &fds, &fds, &fds, &tv); 982 // No events -> we've processed all pending events 983 if (rv == 0) { 984 devdlog(LOG_DEBUG, "Calling daemon\n"); 985 cfg.remove_pidfile(); 986 cfg.open_pidfile(); 987 daemon(0, 0); 988 cfg.write_pidfile(); 989 once++; 990 } 991 } 992 /* 993 * When we've already got the max number of clients, stop 994 * accepting new connections (don't put the listening sockets in 995 * the set), shrink the accept() queue to reject connections 996 * quickly, and poll the existing clients more often, so that we 997 * notice more quickly when any of them disappear to free up 998 * client slots. 999 */ 1000 FD_ZERO(&fds); 1001 FD_SET(fd, &fds); 1002 if (num_clients < max_clients) { 1003 if (!accepting) { 1004 listen(stream_fd, max_clients); 1005 listen(seqpacket_fd, max_clients); 1006 accepting = 1; 1007 } 1008 FD_SET(stream_fd, &fds); 1009 FD_SET(seqpacket_fd, &fds); 1010 tv.tv_sec = 60; 1011 tv.tv_usec = 0; 1012 } else { 1013 if (accepting) { 1014 listen(stream_fd, 0); 1015 listen(seqpacket_fd, 0); 1016 accepting = 0; 1017 } 1018 tv.tv_sec = 2; 1019 tv.tv_usec = 0; 1020 } 1021 rv = select(max_fd, &fds, NULL, NULL, &tv); 1022 if (got_siginfo) { 1023 devdlog(LOG_NOTICE, "Events received so far=%u\n", 1024 total_events); 1025 got_siginfo = 0; 1026 } 1027 if (rv == -1) { 1028 if (errno == EINTR) 1029 continue; 1030 err(1, "select"); 1031 } else if (rv == 0) 1032 check_clients(); 1033 if (FD_ISSET(fd, &fds)) { 1034 rv = read(fd, buffer, sizeof(buffer) - 1); 1035 if (rv > 0) { 1036 total_events++; 1037 if (rv == sizeof(buffer) - 1) { 1038 devdlog(LOG_WARNING, "Warning: " 1039 "available event data exceeded " 1040 "buffer space\n"); 1041 } 1042 notify_clients(buffer, rv); 1043 buffer[rv] = '\0'; 1044 while (buffer[--rv] == '\n') 1045 buffer[rv] = '\0'; 1046 process_event(buffer); 1047 } else if (rv < 0) { 1048 if (errno != EINTR) 1049 break; 1050 } else { 1051 /* EOF */ 1052 break; 1053 } 1054 } 1055 if (FD_ISSET(stream_fd, &fds)) 1056 new_client(stream_fd, SOCK_STREAM); 1057 /* 1058 * Aside from the socket type, both sockets use the same 1059 * protocol, so we can process clients the same way. 1060 */ 1061 if (FD_ISSET(seqpacket_fd, &fds)) 1062 new_client(seqpacket_fd, SOCK_SEQPACKET); 1063 } 1064 close(fd); 1065 } 1066 1067 /* 1068 * functions that the parser uses. 1069 */ 1070 void 1071 add_attach(int prio, event_proc *p) 1072 { 1073 cfg.add_attach(prio, p); 1074 } 1075 1076 void 1077 add_detach(int prio, event_proc *p) 1078 { 1079 cfg.add_detach(prio, p); 1080 } 1081 1082 void 1083 add_directory(const char *dir) 1084 { 1085 cfg.add_directory(dir); 1086 free(const_cast<char *>(dir)); 1087 } 1088 1089 void 1090 add_nomatch(int prio, event_proc *p) 1091 { 1092 cfg.add_nomatch(prio, p); 1093 } 1094 1095 void 1096 add_notify(int prio, event_proc *p) 1097 { 1098 cfg.add_notify(prio, p); 1099 } 1100 1101 event_proc * 1102 add_to_event_proc(event_proc *ep, eps *eps) 1103 { 1104 if (ep == NULL) 1105 ep = new event_proc(); 1106 ep->add(eps); 1107 return (ep); 1108 } 1109 1110 eps * 1111 new_action(const char *cmd) 1112 { 1113 eps *e = new action(cmd); 1114 free(const_cast<char *>(cmd)); 1115 return (e); 1116 } 1117 1118 eps * 1119 new_match(const char *var, const char *re) 1120 { 1121 eps *e = new match(cfg, var, re); 1122 free(const_cast<char *>(var)); 1123 free(const_cast<char *>(re)); 1124 return (e); 1125 } 1126 1127 eps * 1128 new_media(const char *var, const char *re) 1129 { 1130 eps *e = new media(cfg, var, re); 1131 free(const_cast<char *>(var)); 1132 free(const_cast<char *>(re)); 1133 return (e); 1134 } 1135 1136 void 1137 set_pidfile(const char *name) 1138 { 1139 cfg.set_pidfile(name); 1140 free(const_cast<char *>(name)); 1141 } 1142 1143 void 1144 set_variable(const char *var, const char *val) 1145 { 1146 cfg.set_variable(var, val); 1147 free(const_cast<char *>(var)); 1148 free(const_cast<char *>(val)); 1149 } 1150 1151 1152 1153 static void 1154 gensighand(int) 1155 { 1156 romeo_must_die = 1; 1157 } 1158 1159 /* 1160 * SIGINFO handler. Will print useful statistics to the syslog or stderr 1161 * as appropriate 1162 */ 1163 static void 1164 siginfohand(int) 1165 { 1166 got_siginfo = 1; 1167 } 1168 1169 /* 1170 * Local logging function. Prints to syslog if we're daemonized; stderr 1171 * otherwise. 1172 */ 1173 static void 1174 devdlog(int priority, const char* fmt, ...) 1175 { 1176 va_list argp; 1177 1178 va_start(argp, fmt); 1179 if (no_daemon) 1180 vfprintf(stderr, fmt, argp); 1181 else if ((! quiet_mode) || (priority <= LOG_WARNING)) 1182 vsyslog(priority, fmt, argp); 1183 va_end(argp); 1184 } 1185 1186 static void 1187 usage() 1188 { 1189 fprintf(stderr, "usage: %s [-dnq] [-l connlimit] [-f file]\n", 1190 getprogname()); 1191 exit(1); 1192 } 1193 1194 static void 1195 check_devd_enabled() 1196 { 1197 int val = 0; 1198 size_t len; 1199 1200 len = sizeof(val); 1201 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0) 1202 errx(1, "devctl sysctl missing from kernel!"); 1203 if (val == 0) { 1204 warnx("Setting " SYSCTL " to 1000"); 1205 val = 1000; 1206 sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val)); 1207 } 1208 } 1209 1210 /* 1211 * main 1212 */ 1213 int 1214 main(int argc, char **argv) 1215 { 1216 int ch; 1217 1218 check_devd_enabled(); 1219 while ((ch = getopt(argc, argv, "df:l:nq")) != -1) { 1220 switch (ch) { 1221 case 'd': 1222 no_daemon = 1; 1223 break; 1224 case 'f': 1225 configfile = optarg; 1226 break; 1227 case 'l': 1228 max_clients = MAX(1, strtoul(optarg, NULL, 0)); 1229 break; 1230 case 'n': 1231 daemonize_quick = 1; 1232 break; 1233 case 'q': 1234 quiet_mode = 1; 1235 break; 1236 default: 1237 usage(); 1238 } 1239 } 1240 1241 cfg.parse(); 1242 if (!no_daemon && daemonize_quick) { 1243 cfg.open_pidfile(); 1244 daemon(0, 0); 1245 cfg.write_pidfile(); 1246 } 1247 signal(SIGPIPE, SIG_IGN); 1248 signal(SIGHUP, gensighand); 1249 signal(SIGINT, gensighand); 1250 signal(SIGTERM, gensighand); 1251 signal(SIGINFO, siginfohand); 1252 event_loop(); 1253 return (0); 1254 } 1255