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 * 3. 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 <stdexcept> 99 #include <vector> 100 101 #include "devd.h" /* C compatible definitions */ 102 #include "devd.hh" /* C++ class definitions */ 103 104 #define STREAMPIPE "/var/run/devd.pipe" 105 #define SEQPACKETPIPE "/var/run/devd.seqpacket.pipe" 106 #define CF "/etc/devd.conf" 107 #define SYSCTL "hw.bus.devctl_queue" 108 109 /* 110 * Since the client socket is nonblocking, we must increase its send buffer to 111 * handle brief event storms. On FreeBSD, AF_UNIX sockets don't have a receive 112 * buffer, so the client can't increase the buffersize by itself. 113 * 114 * For example, when creating a ZFS pool, devd emits one 165 character 115 * resource.fs.zfs.statechange message for each vdev in the pool. The kernel 116 * allocates a 4608B mbuf for each message. Modern technology places a limit of 117 * roughly 450 drives/rack, and it's unlikely that a zpool will ever be larger 118 * than that. 119 * 120 * 450 drives * 165 bytes / drive = 74250B of data in the sockbuf 121 * 450 drives * 4608B / drive = 2073600B of mbufs in the sockbuf 122 * 123 * We can't directly set the sockbuf's mbuf limit, but we can do it indirectly. 124 * The kernel sets it to the minimum of a hard-coded maximum value and sbcc * 125 * kern.ipc.sockbuf_waste_factor, where sbcc is the socket buffer size set by 126 * the user. The default value of kern.ipc.sockbuf_waste_factor is 8. If we 127 * set the bufsize to 256k and use the kern.ipc.sockbuf_waste_factor, then the 128 * kernel will set the mbuf limit to 2MB, which is just large enough for 450 129 * drives. It also happens to be the same as the hardcoded maximum value. 130 */ 131 #define CLIENT_BUFSIZE 262144 132 133 using namespace std; 134 135 typedef struct client { 136 int fd; 137 int socktype; 138 } client_t; 139 140 extern FILE *yyin; 141 extern int lineno; 142 143 static const char notify = '!'; 144 static const char nomatch = '?'; 145 static const char attach = '+'; 146 static const char detach = '-'; 147 148 static struct pidfh *pfh; 149 150 static int no_daemon = 0; 151 static int daemonize_quick = 0; 152 static int quiet_mode = 0; 153 static unsigned total_events = 0; 154 static volatile sig_atomic_t got_siginfo = 0; 155 static volatile sig_atomic_t romeo_must_die = 0; 156 157 static const char *configfile = CF; 158 159 static void devdlog(int priority, const char* message, ...) 160 __printflike(2, 3); 161 static void event_loop(void); 162 static void usage(void); 163 164 template <class T> void 165 delete_and_clear(vector<T *> &v) 166 { 167 typename vector<T *>::const_iterator i; 168 169 for (i = v.begin(); i != v.end(); ++i) 170 delete *i; 171 v.clear(); 172 } 173 174 config cfg; 175 176 event_proc::event_proc() : _prio(-1) 177 { 178 _epsvec.reserve(4); 179 } 180 181 event_proc::~event_proc() 182 { 183 delete_and_clear(_epsvec); 184 } 185 186 void 187 event_proc::add(eps *eps) 188 { 189 _epsvec.push_back(eps); 190 } 191 192 bool 193 event_proc::matches(config &c) const 194 { 195 vector<eps *>::const_iterator i; 196 197 for (i = _epsvec.begin(); i != _epsvec.end(); ++i) 198 if (!(*i)->do_match(c)) 199 return (false); 200 return (true); 201 } 202 203 bool 204 event_proc::run(config &c) const 205 { 206 vector<eps *>::const_iterator i; 207 208 for (i = _epsvec.begin(); i != _epsvec.end(); ++i) 209 if (!(*i)->do_action(c)) 210 return (false); 211 return (true); 212 } 213 214 action::action(const char *cmd) 215 : _cmd(cmd) 216 { 217 // nothing 218 } 219 220 action::~action() 221 { 222 // nothing 223 } 224 225 static int 226 my_system(const char *command) 227 { 228 pid_t pid, savedpid; 229 int pstat; 230 struct sigaction ign, intact, quitact; 231 sigset_t newsigblock, oldsigblock; 232 233 if (!command) /* just checking... */ 234 return (1); 235 236 /* 237 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save 238 * existing signal dispositions. 239 */ 240 ign.sa_handler = SIG_IGN; 241 ::sigemptyset(&ign.sa_mask); 242 ign.sa_flags = 0; 243 ::sigaction(SIGINT, &ign, &intact); 244 ::sigaction(SIGQUIT, &ign, &quitact); 245 ::sigemptyset(&newsigblock); 246 ::sigaddset(&newsigblock, SIGCHLD); 247 ::sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); 248 switch (pid = ::fork()) { 249 case -1: /* error */ 250 break; 251 case 0: /* child */ 252 /* 253 * Restore original signal dispositions and exec the command. 254 */ 255 ::sigaction(SIGINT, &intact, NULL); 256 ::sigaction(SIGQUIT, &quitact, NULL); 257 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 258 /* 259 * Close the PID file, and all other open descriptors. 260 * Inherit std{in,out,err} only. 261 */ 262 cfg.close_pidfile(); 263 ::closefrom(3); 264 ::execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); 265 ::_exit(127); 266 default: /* parent */ 267 savedpid = pid; 268 do { 269 pid = ::wait4(savedpid, &pstat, 0, (struct rusage *)0); 270 } while (pid == -1 && errno == EINTR); 271 break; 272 } 273 ::sigaction(SIGINT, &intact, NULL); 274 ::sigaction(SIGQUIT, &quitact, NULL); 275 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 276 return (pid == -1 ? -1 : pstat); 277 } 278 279 bool 280 action::do_action(config &c) 281 { 282 string s = c.expand_string(_cmd.c_str()); 283 devdlog(LOG_INFO, "Executing '%s'\n", s.c_str()); 284 my_system(s.c_str()); 285 return (true); 286 } 287 288 match::match(config &c, const char *var, const char *re) : 289 _inv(re[0] == '!'), 290 _var(var), 291 _re(c.expand_string(_inv ? re + 1 : re, "^", "$")) 292 { 293 regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE); 294 } 295 296 match::~match() 297 { 298 regfree(&_regex); 299 } 300 301 bool 302 match::do_match(config &c) 303 { 304 const string &value = c.get_variable(_var); 305 bool retval; 306 307 /* 308 * This function gets called WAY too often to justify calling syslog() 309 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 310 * can consume excessive amounts of systime inside of connect(). Only 311 * log when we're in -d mode. 312 */ 313 if (no_daemon) { 314 devdlog(LOG_DEBUG, "Testing %s=%s against %s, invert=%d\n", 315 _var.c_str(), value.c_str(), _re.c_str(), _inv); 316 } 317 318 retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0); 319 if (_inv == 1) 320 retval = (retval == 0) ? 1 : 0; 321 322 return (retval); 323 } 324 325 #include <sys/sockio.h> 326 #include <net/if.h> 327 #include <net/if_media.h> 328 329 media::media(config &, const char *var, const char *type) 330 : _var(var), _type(-1) 331 { 332 static struct ifmedia_description media_types[] = { 333 { IFM_ETHER, "Ethernet" }, 334 { IFM_TOKEN, "Tokenring" }, 335 { IFM_FDDI, "FDDI" }, 336 { IFM_IEEE80211, "802.11" }, 337 { IFM_ATM, "ATM" }, 338 { -1, "unknown" }, 339 { 0, NULL }, 340 }; 341 for (int i = 0; media_types[i].ifmt_string != NULL; ++i) 342 if (strcasecmp(type, media_types[i].ifmt_string) == 0) { 343 _type = media_types[i].ifmt_word; 344 break; 345 } 346 } 347 348 media::~media() 349 { 350 } 351 352 bool 353 media::do_match(config &c) 354 { 355 string value; 356 struct ifmediareq ifmr; 357 bool retval; 358 int s; 359 360 // Since we can be called from both a device attach/detach 361 // context where device-name is defined and what we want, 362 // as well as from a link status context, where subsystem is 363 // the name of interest, first try device-name and fall back 364 // to subsystem if none exists. 365 value = c.get_variable("device-name"); 366 if (value.empty()) 367 value = c.get_variable("subsystem"); 368 devdlog(LOG_DEBUG, "Testing media type of %s against 0x%x\n", 369 value.c_str(), _type); 370 371 retval = false; 372 373 s = socket(PF_INET, SOCK_DGRAM, 0); 374 if (s >= 0) { 375 memset(&ifmr, 0, sizeof(ifmr)); 376 strlcpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name)); 377 378 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 && 379 ifmr.ifm_status & IFM_AVALID) { 380 devdlog(LOG_DEBUG, "%s has media type 0x%x\n", 381 value.c_str(), IFM_TYPE(ifmr.ifm_active)); 382 retval = (IFM_TYPE(ifmr.ifm_active) == _type); 383 } else if (_type == -1) { 384 devdlog(LOG_DEBUG, "%s has unknown media type\n", 385 value.c_str()); 386 retval = true; 387 } 388 close(s); 389 } 390 391 return (retval); 392 } 393 394 const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_"; 395 const string var_list::nothing = ""; 396 397 const string & 398 var_list::get_variable(const string &var) const 399 { 400 map<string, string>::const_iterator i; 401 402 i = _vars.find(var); 403 if (i == _vars.end()) 404 return (var_list::bogus); 405 return (i->second); 406 } 407 408 bool 409 var_list::is_set(const string &var) const 410 { 411 return (_vars.find(var) != _vars.end()); 412 } 413 414 void 415 var_list::set_variable(const string &var, const string &val) 416 { 417 /* 418 * This function gets called WAY too often to justify calling syslog() 419 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 420 * can consume excessive amounts of systime inside of connect(). Only 421 * log when we're in -d mode. 422 */ 423 if (no_daemon) 424 devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str()); 425 _vars[var] = val; 426 } 427 428 void 429 config::reset(void) 430 { 431 _dir_list.clear(); 432 delete_and_clear(_var_list_table); 433 delete_and_clear(_attach_list); 434 delete_and_clear(_detach_list); 435 delete_and_clear(_nomatch_list); 436 delete_and_clear(_notify_list); 437 } 438 439 void 440 config::parse_one_file(const char *fn) 441 { 442 devdlog(LOG_DEBUG, "Parsing %s\n", fn); 443 yyin = fopen(fn, "r"); 444 if (yyin == NULL) 445 err(1, "Cannot open config file %s", fn); 446 lineno = 1; 447 if (yyparse() != 0) 448 errx(1, "Cannot parse %s at line %d", fn, lineno); 449 fclose(yyin); 450 } 451 452 void 453 config::parse_files_in_dir(const char *dirname) 454 { 455 DIR *dirp; 456 struct dirent *dp; 457 char path[PATH_MAX]; 458 459 devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname); 460 dirp = opendir(dirname); 461 if (dirp == NULL) 462 return; 463 readdir(dirp); /* Skip . */ 464 readdir(dirp); /* Skip .. */ 465 while ((dp = readdir(dirp)) != NULL) { 466 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) { 467 snprintf(path, sizeof(path), "%s/%s", 468 dirname, dp->d_name); 469 parse_one_file(path); 470 } 471 } 472 closedir(dirp); 473 } 474 475 class epv_greater { 476 public: 477 int operator()(event_proc *const&l1, event_proc *const&l2) const 478 { 479 return (l1->get_priority() > l2->get_priority()); 480 } 481 }; 482 483 void 484 config::sort_vector(vector<event_proc *> &v) 485 { 486 stable_sort(v.begin(), v.end(), epv_greater()); 487 } 488 489 void 490 config::parse(void) 491 { 492 vector<string>::const_iterator i; 493 494 parse_one_file(configfile); 495 for (i = _dir_list.begin(); i != _dir_list.end(); ++i) 496 parse_files_in_dir((*i).c_str()); 497 sort_vector(_attach_list); 498 sort_vector(_detach_list); 499 sort_vector(_nomatch_list); 500 sort_vector(_notify_list); 501 } 502 503 void 504 config::open_pidfile() 505 { 506 pid_t otherpid; 507 508 if (_pidfile.empty()) 509 return; 510 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid); 511 if (pfh == NULL) { 512 if (errno == EEXIST) 513 errx(1, "devd already running, pid: %d", (int)otherpid); 514 warn("cannot open pid file"); 515 } 516 } 517 518 void 519 config::write_pidfile() 520 { 521 522 pidfile_write(pfh); 523 } 524 525 void 526 config::close_pidfile() 527 { 528 529 pidfile_close(pfh); 530 } 531 532 void 533 config::remove_pidfile() 534 { 535 536 pidfile_remove(pfh); 537 } 538 539 void 540 config::add_attach(int prio, event_proc *p) 541 { 542 p->set_priority(prio); 543 _attach_list.push_back(p); 544 } 545 546 void 547 config::add_detach(int prio, event_proc *p) 548 { 549 p->set_priority(prio); 550 _detach_list.push_back(p); 551 } 552 553 void 554 config::add_directory(const char *dir) 555 { 556 _dir_list.push_back(string(dir)); 557 } 558 559 void 560 config::add_nomatch(int prio, event_proc *p) 561 { 562 p->set_priority(prio); 563 _nomatch_list.push_back(p); 564 } 565 566 void 567 config::add_notify(int prio, event_proc *p) 568 { 569 p->set_priority(prio); 570 _notify_list.push_back(p); 571 } 572 573 void 574 config::set_pidfile(const char *fn) 575 { 576 _pidfile = fn; 577 } 578 579 void 580 config::push_var_table() 581 { 582 var_list *vl; 583 584 vl = new var_list(); 585 _var_list_table.push_back(vl); 586 devdlog(LOG_DEBUG, "Pushing table\n"); 587 } 588 589 void 590 config::pop_var_table() 591 { 592 delete _var_list_table.back(); 593 _var_list_table.pop_back(); 594 devdlog(LOG_DEBUG, "Popping table\n"); 595 } 596 597 void 598 config::set_variable(const char *var, const char *val) 599 { 600 _var_list_table.back()->set_variable(var, val); 601 } 602 603 const string & 604 config::get_variable(const string &var) 605 { 606 vector<var_list *>::reverse_iterator i; 607 608 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) { 609 if ((*i)->is_set(var)) 610 return ((*i)->get_variable(var)); 611 } 612 return (var_list::nothing); 613 } 614 615 bool 616 config::is_id_char(char ch) const 617 { 618 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' || 619 ch == '-')); 620 } 621 622 void 623 config::expand_one(const char *&src, string &dst) 624 { 625 int count; 626 string buffer; 627 628 src++; 629 // $$ -> $ 630 if (*src == '$') { 631 dst += *src++; 632 return; 633 } 634 635 // $(foo) -> $(foo) 636 // Not sure if I want to support this or not, so for now we just pass 637 // it through. 638 if (*src == '(') { 639 dst += '$'; 640 count = 1; 641 /* If the string ends before ) is matched , return. */ 642 while (count > 0 && *src) { 643 if (*src == ')') 644 count--; 645 else if (*src == '(') 646 count++; 647 dst += *src++; 648 } 649 return; 650 } 651 652 // $[^-A-Za-z_*] -> $\1 653 if (!isalpha(*src) && *src != '_' && *src != '-' && *src != '*') { 654 dst += '$'; 655 dst += *src++; 656 return; 657 } 658 659 // $var -> replace with value 660 do { 661 buffer += *src++; 662 } while (is_id_char(*src)); 663 dst.append(get_variable(buffer)); 664 } 665 666 const string 667 config::expand_string(const char *src, const char *prepend, const char *append) 668 { 669 const char *var_at; 670 string dst; 671 672 /* 673 * 128 bytes is enough for 2427 of 2438 expansions that happen 674 * while parsing config files, as tested on 2013-01-30. 675 */ 676 dst.reserve(128); 677 678 if (prepend != NULL) 679 dst = prepend; 680 681 for (;;) { 682 var_at = strchr(src, '$'); 683 if (var_at == NULL) { 684 dst.append(src); 685 break; 686 } 687 dst.append(src, var_at - src); 688 src = var_at; 689 expand_one(src, dst); 690 } 691 692 if (append != NULL) 693 dst.append(append); 694 695 return (dst); 696 } 697 698 bool 699 config::chop_var(char *&buffer, char *&lhs, char *&rhs) const 700 { 701 char *walker; 702 703 if (*buffer == '\0') 704 return (false); 705 walker = lhs = buffer; 706 while (is_id_char(*walker)) 707 walker++; 708 if (*walker != '=') 709 return (false); 710 walker++; // skip = 711 if (*walker == '"') { 712 walker++; // skip " 713 rhs = walker; 714 while (*walker && *walker != '"') 715 walker++; 716 if (*walker != '"') 717 return (false); 718 rhs[-2] = '\0'; 719 *walker++ = '\0'; 720 } else { 721 rhs = walker; 722 while (*walker && !isspace(*walker)) 723 walker++; 724 if (*walker != '\0') 725 *walker++ = '\0'; 726 rhs[-1] = '\0'; 727 } 728 while (isspace(*walker)) 729 walker++; 730 buffer = walker; 731 return (true); 732 } 733 734 735 char * 736 config::set_vars(char *buffer) 737 { 738 char *lhs; 739 char *rhs; 740 741 while (1) { 742 if (!chop_var(buffer, lhs, rhs)) 743 break; 744 set_variable(lhs, rhs); 745 } 746 return (buffer); 747 } 748 749 void 750 config::find_and_execute(char type) 751 { 752 vector<event_proc *> *l; 753 vector<event_proc *>::const_iterator i; 754 const char *s; 755 756 switch (type) { 757 default: 758 return; 759 case notify: 760 l = &_notify_list; 761 s = "notify"; 762 break; 763 case nomatch: 764 l = &_nomatch_list; 765 s = "nomatch"; 766 break; 767 case attach: 768 l = &_attach_list; 769 s = "attach"; 770 break; 771 case detach: 772 l = &_detach_list; 773 s = "detach"; 774 break; 775 } 776 devdlog(LOG_DEBUG, "Processing %s event\n", s); 777 for (i = l->begin(); i != l->end(); ++i) { 778 if ((*i)->matches(*this)) { 779 (*i)->run(*this); 780 break; 781 } 782 } 783 784 } 785 786 787 static void 788 process_event(char *buffer) 789 { 790 char type; 791 char *sp; 792 struct timeval tv; 793 char *timestr; 794 795 sp = buffer + 1; 796 devdlog(LOG_INFO, "Processing event '%s'\n", buffer); 797 type = *buffer++; 798 cfg.push_var_table(); 799 // $* is the entire line 800 cfg.set_variable("*", buffer - 1); 801 // $_ is the entire line without the initial character 802 cfg.set_variable("_", buffer); 803 804 // Save the time this happened (as approximated by when we got 805 // around to processing it). 806 gettimeofday(&tv, NULL); 807 asprintf(×tr, "%jd.%06ld", (uintmax_t)tv.tv_sec, tv.tv_usec); 808 cfg.set_variable("timestamp", timestr); 809 free(timestr); 810 811 // Match doesn't have a device, and the format is a little 812 // different, so handle it separately. 813 switch (type) { 814 case notify: 815 //! (k=v)* 816 sp = cfg.set_vars(sp); 817 break; 818 case nomatch: 819 //? at location pnp-info on bus 820 sp = strchr(sp, ' '); 821 if (sp == NULL) 822 return; /* Can't happen? */ 823 *sp++ = '\0'; 824 while (isspace(*sp)) 825 sp++; 826 if (strncmp(sp, "at ", 3) == 0) 827 sp += 3; 828 sp = cfg.set_vars(sp); 829 while (isspace(*sp)) 830 sp++; 831 if (strncmp(sp, "on ", 3) == 0) 832 cfg.set_variable("bus", sp + 3); 833 break; 834 case attach: /*FALLTHROUGH*/ 835 case detach: 836 sp = strchr(sp, ' '); 837 if (sp == NULL) 838 return; /* Can't happen? */ 839 *sp++ = '\0'; 840 cfg.set_variable("device-name", buffer); 841 while (isspace(*sp)) 842 sp++; 843 if (strncmp(sp, "at ", 3) == 0) 844 sp += 3; 845 sp = cfg.set_vars(sp); 846 while (isspace(*sp)) 847 sp++; 848 if (strncmp(sp, "on ", 3) == 0) 849 cfg.set_variable("bus", sp + 3); 850 break; 851 } 852 853 cfg.find_and_execute(type); 854 cfg.pop_var_table(); 855 } 856 857 int 858 create_socket(const char *name, int socktype) 859 { 860 int fd, slen; 861 struct sockaddr_un sun; 862 863 if ((fd = socket(PF_LOCAL, socktype, 0)) < 0) 864 err(1, "socket"); 865 bzero(&sun, sizeof(sun)); 866 sun.sun_family = AF_UNIX; 867 strlcpy(sun.sun_path, name, sizeof(sun.sun_path)); 868 slen = SUN_LEN(&sun); 869 unlink(name); 870 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 871 err(1, "fcntl"); 872 if (::bind(fd, (struct sockaddr *) & sun, slen) < 0) 873 err(1, "bind"); 874 listen(fd, 4); 875 if (chown(name, 0, 0)) /* XXX - root.wheel */ 876 err(1, "chown"); 877 if (chmod(name, 0666)) 878 err(1, "chmod"); 879 return (fd); 880 } 881 882 unsigned int max_clients = 10; /* Default, can be overridden on cmdline. */ 883 unsigned int num_clients; 884 885 list<client_t> clients; 886 887 void 888 notify_clients(const char *data, int len) 889 { 890 list<client_t>::iterator i; 891 892 /* 893 * Deliver the data to all clients. Throw clients overboard at the 894 * first sign of trouble. This reaps clients who've died or closed 895 * their sockets, and also clients who are alive but failing to keep up 896 * (or who are maliciously not reading, to consume buffer space in 897 * kernel memory or tie up the limited number of available connections). 898 */ 899 for (i = clients.begin(); i != clients.end(); ) { 900 int flags; 901 if (i->socktype == SOCK_SEQPACKET) 902 flags = MSG_EOR; 903 else 904 flags = 0; 905 906 if (send(i->fd, data, len, flags) != len) { 907 --num_clients; 908 close(i->fd); 909 i = clients.erase(i); 910 devdlog(LOG_WARNING, "notify_clients: send() failed; " 911 "dropping unresponsive client\n"); 912 } else 913 ++i; 914 } 915 } 916 917 void 918 check_clients(void) 919 { 920 int s; 921 struct pollfd pfd; 922 list<client_t>::iterator i; 923 924 /* 925 * Check all existing clients to see if any of them have disappeared. 926 * Normally we reap clients when we get an error trying to send them an 927 * event. This check eliminates the problem of an ever-growing list of 928 * zombie clients because we're never writing to them on a system 929 * without frequent device-change activity. 930 */ 931 pfd.events = 0; 932 for (i = clients.begin(); i != clients.end(); ) { 933 pfd.fd = i->fd; 934 s = poll(&pfd, 1, 0); 935 if ((s < 0 && s != EINTR ) || 936 (s > 0 && (pfd.revents & POLLHUP))) { 937 --num_clients; 938 close(i->fd); 939 i = clients.erase(i); 940 devdlog(LOG_NOTICE, "check_clients: " 941 "dropping disconnected client\n"); 942 } else 943 ++i; 944 } 945 } 946 947 void 948 new_client(int fd, int socktype) 949 { 950 client_t s; 951 int sndbuf_size; 952 953 /* 954 * First go reap any zombie clients, then accept the connection, and 955 * shut down the read side to stop clients from consuming kernel memory 956 * by sending large buffers full of data we'll never read. 957 */ 958 check_clients(); 959 s.socktype = socktype; 960 s.fd = accept(fd, NULL, NULL); 961 if (s.fd != -1) { 962 sndbuf_size = CLIENT_BUFSIZE; 963 if (setsockopt(s.fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, 964 sizeof(sndbuf_size))) 965 err(1, "setsockopt"); 966 shutdown(s.fd, SHUT_RD); 967 clients.push_back(s); 968 ++num_clients; 969 } else 970 err(1, "accept"); 971 } 972 973 static void 974 event_loop(void) 975 { 976 int rv; 977 int fd; 978 char buffer[DEVCTL_MAXBUF]; 979 int once = 0; 980 int stream_fd, seqpacket_fd, max_fd; 981 int accepting; 982 timeval tv; 983 fd_set fds; 984 985 fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC); 986 if (fd == -1) 987 err(1, "Can't open devctl device %s", PATH_DEVCTL); 988 stream_fd = create_socket(STREAMPIPE, SOCK_STREAM); 989 seqpacket_fd = create_socket(SEQPACKETPIPE, SOCK_SEQPACKET); 990 accepting = 1; 991 max_fd = max(fd, max(stream_fd, seqpacket_fd)) + 1; 992 while (!romeo_must_die) { 993 if (!once && !no_daemon && !daemonize_quick) { 994 // Check to see if we have any events pending. 995 tv.tv_sec = 0; 996 tv.tv_usec = 0; 997 FD_ZERO(&fds); 998 FD_SET(fd, &fds); 999 rv = select(fd + 1, &fds, &fds, &fds, &tv); 1000 // No events -> we've processed all pending events 1001 if (rv == 0) { 1002 devdlog(LOG_DEBUG, "Calling daemon\n"); 1003 cfg.remove_pidfile(); 1004 cfg.open_pidfile(); 1005 daemon(0, 0); 1006 cfg.write_pidfile(); 1007 once++; 1008 } 1009 } 1010 /* 1011 * When we've already got the max number of clients, stop 1012 * accepting new connections (don't put the listening sockets in 1013 * the set), shrink the accept() queue to reject connections 1014 * quickly, and poll the existing clients more often, so that we 1015 * notice more quickly when any of them disappear to free up 1016 * client slots. 1017 */ 1018 FD_ZERO(&fds); 1019 FD_SET(fd, &fds); 1020 if (num_clients < max_clients) { 1021 if (!accepting) { 1022 listen(stream_fd, max_clients); 1023 listen(seqpacket_fd, max_clients); 1024 accepting = 1; 1025 } 1026 FD_SET(stream_fd, &fds); 1027 FD_SET(seqpacket_fd, &fds); 1028 tv.tv_sec = 60; 1029 tv.tv_usec = 0; 1030 } else { 1031 if (accepting) { 1032 listen(stream_fd, 0); 1033 listen(seqpacket_fd, 0); 1034 accepting = 0; 1035 } 1036 tv.tv_sec = 2; 1037 tv.tv_usec = 0; 1038 } 1039 rv = select(max_fd, &fds, NULL, NULL, &tv); 1040 if (got_siginfo) { 1041 devdlog(LOG_NOTICE, "Events received so far=%u\n", 1042 total_events); 1043 got_siginfo = 0; 1044 } 1045 if (rv == -1) { 1046 if (errno == EINTR) 1047 continue; 1048 err(1, "select"); 1049 } else if (rv == 0) 1050 check_clients(); 1051 if (FD_ISSET(fd, &fds)) { 1052 rv = read(fd, buffer, sizeof(buffer) - 1); 1053 if (rv > 0) { 1054 total_events++; 1055 if (rv == sizeof(buffer) - 1) { 1056 devdlog(LOG_WARNING, "Warning: " 1057 "available event data exceeded " 1058 "buffer space\n"); 1059 } 1060 notify_clients(buffer, rv); 1061 buffer[rv] = '\0'; 1062 while (buffer[--rv] == '\n') 1063 buffer[rv] = '\0'; 1064 try { 1065 process_event(buffer); 1066 } 1067 catch (std::length_error e) { 1068 devdlog(LOG_ERR, "Dropping event %s " 1069 "due to low memory", buffer); 1070 } 1071 } else if (rv < 0) { 1072 if (errno != EINTR) 1073 break; 1074 } else { 1075 /* EOF */ 1076 break; 1077 } 1078 } 1079 if (FD_ISSET(stream_fd, &fds)) 1080 new_client(stream_fd, SOCK_STREAM); 1081 /* 1082 * Aside from the socket type, both sockets use the same 1083 * protocol, so we can process clients the same way. 1084 */ 1085 if (FD_ISSET(seqpacket_fd, &fds)) 1086 new_client(seqpacket_fd, SOCK_SEQPACKET); 1087 } 1088 close(seqpacket_fd); 1089 close(stream_fd); 1090 close(fd); 1091 } 1092 1093 /* 1094 * functions that the parser uses. 1095 */ 1096 void 1097 add_attach(int prio, event_proc *p) 1098 { 1099 cfg.add_attach(prio, p); 1100 } 1101 1102 void 1103 add_detach(int prio, event_proc *p) 1104 { 1105 cfg.add_detach(prio, p); 1106 } 1107 1108 void 1109 add_directory(const char *dir) 1110 { 1111 cfg.add_directory(dir); 1112 free(const_cast<char *>(dir)); 1113 } 1114 1115 void 1116 add_nomatch(int prio, event_proc *p) 1117 { 1118 cfg.add_nomatch(prio, p); 1119 } 1120 1121 void 1122 add_notify(int prio, event_proc *p) 1123 { 1124 cfg.add_notify(prio, p); 1125 } 1126 1127 event_proc * 1128 add_to_event_proc(event_proc *ep, eps *eps) 1129 { 1130 if (ep == NULL) 1131 ep = new event_proc(); 1132 ep->add(eps); 1133 return (ep); 1134 } 1135 1136 eps * 1137 new_action(const char *cmd) 1138 { 1139 eps *e = new action(cmd); 1140 free(const_cast<char *>(cmd)); 1141 return (e); 1142 } 1143 1144 eps * 1145 new_match(const char *var, const char *re) 1146 { 1147 eps *e = new match(cfg, var, re); 1148 free(const_cast<char *>(var)); 1149 free(const_cast<char *>(re)); 1150 return (e); 1151 } 1152 1153 eps * 1154 new_media(const char *var, const char *re) 1155 { 1156 eps *e = new media(cfg, var, re); 1157 free(const_cast<char *>(var)); 1158 free(const_cast<char *>(re)); 1159 return (e); 1160 } 1161 1162 void 1163 set_pidfile(const char *name) 1164 { 1165 cfg.set_pidfile(name); 1166 free(const_cast<char *>(name)); 1167 } 1168 1169 void 1170 set_variable(const char *var, const char *val) 1171 { 1172 cfg.set_variable(var, val); 1173 free(const_cast<char *>(var)); 1174 free(const_cast<char *>(val)); 1175 } 1176 1177 1178 1179 static void 1180 gensighand(int) 1181 { 1182 romeo_must_die = 1; 1183 } 1184 1185 /* 1186 * SIGINFO handler. Will print useful statistics to the syslog or stderr 1187 * as appropriate 1188 */ 1189 static void 1190 siginfohand(int) 1191 { 1192 got_siginfo = 1; 1193 } 1194 1195 /* 1196 * Local logging function. Prints to syslog if we're daemonized; stderr 1197 * otherwise. 1198 */ 1199 static void 1200 devdlog(int priority, const char* fmt, ...) 1201 { 1202 va_list argp; 1203 1204 va_start(argp, fmt); 1205 if (no_daemon) 1206 vfprintf(stderr, fmt, argp); 1207 else if (quiet_mode == 0 || priority <= LOG_WARNING) 1208 vsyslog(priority, fmt, argp); 1209 va_end(argp); 1210 } 1211 1212 static void 1213 usage() 1214 { 1215 fprintf(stderr, "usage: %s [-dnq] [-l connlimit] [-f file]\n", 1216 getprogname()); 1217 exit(1); 1218 } 1219 1220 static void 1221 check_devd_enabled() 1222 { 1223 int val = 0; 1224 size_t len; 1225 1226 len = sizeof(val); 1227 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0) 1228 errx(1, "devctl sysctl missing from kernel!"); 1229 if (val == 0) { 1230 warnx("Setting " SYSCTL " to 1000"); 1231 val = 1000; 1232 if (sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val))) 1233 err(1, "sysctlbyname"); 1234 } 1235 } 1236 1237 /* 1238 * main 1239 */ 1240 int 1241 main(int argc, char **argv) 1242 { 1243 int ch; 1244 1245 check_devd_enabled(); 1246 while ((ch = getopt(argc, argv, "df:l:nq")) != -1) { 1247 switch (ch) { 1248 case 'd': 1249 no_daemon = 1; 1250 break; 1251 case 'f': 1252 configfile = optarg; 1253 break; 1254 case 'l': 1255 max_clients = MAX(1, strtoul(optarg, NULL, 0)); 1256 break; 1257 case 'n': 1258 daemonize_quick = 1; 1259 break; 1260 case 'q': 1261 quiet_mode = 1; 1262 break; 1263 default: 1264 usage(); 1265 } 1266 } 1267 1268 cfg.parse(); 1269 if (!no_daemon && daemonize_quick) { 1270 cfg.open_pidfile(); 1271 daemon(0, 0); 1272 cfg.write_pidfile(); 1273 } 1274 signal(SIGPIPE, SIG_IGN); 1275 signal(SIGHUP, gensighand); 1276 signal(SIGINT, gensighand); 1277 signal(SIGTERM, gensighand); 1278 signal(SIGINFO, siginfohand); 1279 event_loop(); 1280 return (0); 1281 } 1282