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 /** fix_value 415 * 416 * Removes quoted characters that have made it this far. \" are 417 * converted to ". For all other characters, both \ and following 418 * character. So the string 'fre\:\"' is translated to 'fred\:"'. 419 */ 420 std::string 421 var_list::fix_value(const std::string &val) const 422 { 423 std::string rv(val); 424 std::string::size_type pos(0); 425 426 while ((pos = rv.find("\\\"", pos)) != rv.npos) { 427 rv.erase(pos, 1); 428 } 429 return (rv); 430 } 431 432 void 433 var_list::set_variable(const string &var, const string &val) 434 { 435 /* 436 * This function gets called WAY too often to justify calling syslog() 437 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 438 * can consume excessive amounts of systime inside of connect(). Only 439 * log when we're in -d mode. 440 */ 441 _vars[var] = fix_value(val); 442 if (no_daemon) 443 devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str()); 444 } 445 446 void 447 config::reset(void) 448 { 449 _dir_list.clear(); 450 delete_and_clear(_var_list_table); 451 delete_and_clear(_attach_list); 452 delete_and_clear(_detach_list); 453 delete_and_clear(_nomatch_list); 454 delete_and_clear(_notify_list); 455 } 456 457 void 458 config::parse_one_file(const char *fn) 459 { 460 devdlog(LOG_DEBUG, "Parsing %s\n", fn); 461 yyin = fopen(fn, "r"); 462 if (yyin == NULL) 463 err(1, "Cannot open config file %s", fn); 464 lineno = 1; 465 if (yyparse() != 0) 466 errx(1, "Cannot parse %s at line %d", fn, lineno); 467 fclose(yyin); 468 } 469 470 void 471 config::parse_files_in_dir(const char *dirname) 472 { 473 DIR *dirp; 474 struct dirent *dp; 475 char path[PATH_MAX]; 476 477 devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname); 478 dirp = opendir(dirname); 479 if (dirp == NULL) 480 return; 481 readdir(dirp); /* Skip . */ 482 readdir(dirp); /* Skip .. */ 483 while ((dp = readdir(dirp)) != NULL) { 484 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) { 485 snprintf(path, sizeof(path), "%s/%s", 486 dirname, dp->d_name); 487 parse_one_file(path); 488 } 489 } 490 closedir(dirp); 491 } 492 493 class epv_greater { 494 public: 495 int operator()(event_proc *const&l1, event_proc *const&l2) const 496 { 497 return (l1->get_priority() > l2->get_priority()); 498 } 499 }; 500 501 void 502 config::sort_vector(vector<event_proc *> &v) 503 { 504 stable_sort(v.begin(), v.end(), epv_greater()); 505 } 506 507 void 508 config::parse(void) 509 { 510 vector<string>::const_iterator i; 511 512 parse_one_file(configfile); 513 for (i = _dir_list.begin(); i != _dir_list.end(); ++i) 514 parse_files_in_dir((*i).c_str()); 515 sort_vector(_attach_list); 516 sort_vector(_detach_list); 517 sort_vector(_nomatch_list); 518 sort_vector(_notify_list); 519 } 520 521 void 522 config::open_pidfile() 523 { 524 pid_t otherpid; 525 526 if (_pidfile.empty()) 527 return; 528 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid); 529 if (pfh == NULL) { 530 if (errno == EEXIST) 531 errx(1, "devd already running, pid: %d", (int)otherpid); 532 warn("cannot open pid file"); 533 } 534 } 535 536 void 537 config::write_pidfile() 538 { 539 540 pidfile_write(pfh); 541 } 542 543 void 544 config::close_pidfile() 545 { 546 547 pidfile_close(pfh); 548 } 549 550 void 551 config::remove_pidfile() 552 { 553 554 pidfile_remove(pfh); 555 } 556 557 void 558 config::add_attach(int prio, event_proc *p) 559 { 560 p->set_priority(prio); 561 _attach_list.push_back(p); 562 } 563 564 void 565 config::add_detach(int prio, event_proc *p) 566 { 567 p->set_priority(prio); 568 _detach_list.push_back(p); 569 } 570 571 void 572 config::add_directory(const char *dir) 573 { 574 _dir_list.push_back(string(dir)); 575 } 576 577 void 578 config::add_nomatch(int prio, event_proc *p) 579 { 580 p->set_priority(prio); 581 _nomatch_list.push_back(p); 582 } 583 584 void 585 config::add_notify(int prio, event_proc *p) 586 { 587 p->set_priority(prio); 588 _notify_list.push_back(p); 589 } 590 591 void 592 config::set_pidfile(const char *fn) 593 { 594 _pidfile = fn; 595 } 596 597 void 598 config::push_var_table() 599 { 600 var_list *vl; 601 602 vl = new var_list(); 603 _var_list_table.push_back(vl); 604 devdlog(LOG_DEBUG, "Pushing table\n"); 605 } 606 607 void 608 config::pop_var_table() 609 { 610 delete _var_list_table.back(); 611 _var_list_table.pop_back(); 612 devdlog(LOG_DEBUG, "Popping table\n"); 613 } 614 615 void 616 config::set_variable(const char *var, const char *val) 617 { 618 _var_list_table.back()->set_variable(var, val); 619 } 620 621 const string & 622 config::get_variable(const string &var) 623 { 624 vector<var_list *>::reverse_iterator i; 625 626 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) { 627 if ((*i)->is_set(var)) 628 return ((*i)->get_variable(var)); 629 } 630 return (var_list::nothing); 631 } 632 633 bool 634 config::is_id_char(char ch) const 635 { 636 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' || 637 ch == '-')); 638 } 639 640 void 641 config::expand_one(const char *&src, string &dst) 642 { 643 int count; 644 string buffer; 645 646 src++; 647 // $$ -> $ 648 if (*src == '$') { 649 dst += *src++; 650 return; 651 } 652 653 // $(foo) -> $(foo) 654 // Not sure if I want to support this or not, so for now we just pass 655 // it through. 656 if (*src == '(') { 657 dst += '$'; 658 count = 1; 659 /* If the string ends before ) is matched , return. */ 660 while (count > 0 && *src) { 661 if (*src == ')') 662 count--; 663 else if (*src == '(') 664 count++; 665 dst += *src++; 666 } 667 return; 668 } 669 670 // $[^-A-Za-z_*] -> $\1 671 if (!isalpha(*src) && *src != '_' && *src != '-' && *src != '*') { 672 dst += '$'; 673 dst += *src++; 674 return; 675 } 676 677 // $var -> replace with value 678 do { 679 buffer += *src++; 680 } while (is_id_char(*src)); 681 dst.append(get_variable(buffer)); 682 } 683 684 const string 685 config::expand_string(const char *src, const char *prepend, const char *append) 686 { 687 const char *var_at; 688 string dst; 689 690 /* 691 * 128 bytes is enough for 2427 of 2438 expansions that happen 692 * while parsing config files, as tested on 2013-01-30. 693 */ 694 dst.reserve(128); 695 696 if (prepend != NULL) 697 dst = prepend; 698 699 for (;;) { 700 var_at = strchr(src, '$'); 701 if (var_at == NULL) { 702 dst.append(src); 703 break; 704 } 705 dst.append(src, var_at - src); 706 src = var_at; 707 expand_one(src, dst); 708 } 709 710 if (append != NULL) 711 dst.append(append); 712 713 return (dst); 714 } 715 716 bool 717 config::chop_var(char *&buffer, char *&lhs, char *&rhs) const 718 { 719 char *walker; 720 721 if (*buffer == '\0') 722 return (false); 723 walker = lhs = buffer; 724 while (is_id_char(*walker)) 725 walker++; 726 if (*walker != '=') 727 return (false); 728 walker++; // skip = 729 if (*walker == '"') { 730 walker++; // skip " 731 rhs = walker; 732 while (*walker && *walker != '"') { 733 // Skip \" ... We leave it in the string and strip the \ later. 734 // due to the super simplistic parser that we have here. 735 if (*walker == '\\' && walker[1] == '"') 736 walker++; 737 walker++; 738 } 739 if (*walker != '"') 740 return (false); 741 rhs[-2] = '\0'; 742 *walker++ = '\0'; 743 } else { 744 rhs = walker; 745 while (*walker && !isspace(*walker)) 746 walker++; 747 if (*walker != '\0') 748 *walker++ = '\0'; 749 rhs[-1] = '\0'; 750 } 751 while (isspace(*walker)) 752 walker++; 753 buffer = walker; 754 return (true); 755 } 756 757 758 char * 759 config::set_vars(char *buffer) 760 { 761 char *lhs; 762 char *rhs; 763 764 while (1) { 765 if (!chop_var(buffer, lhs, rhs)) 766 break; 767 set_variable(lhs, rhs); 768 } 769 return (buffer); 770 } 771 772 void 773 config::find_and_execute(char type) 774 { 775 vector<event_proc *> *l; 776 vector<event_proc *>::const_iterator i; 777 const char *s; 778 779 switch (type) { 780 default: 781 return; 782 case notify: 783 l = &_notify_list; 784 s = "notify"; 785 break; 786 case nomatch: 787 l = &_nomatch_list; 788 s = "nomatch"; 789 break; 790 case attach: 791 l = &_attach_list; 792 s = "attach"; 793 break; 794 case detach: 795 l = &_detach_list; 796 s = "detach"; 797 break; 798 } 799 devdlog(LOG_DEBUG, "Processing %s event\n", s); 800 for (i = l->begin(); i != l->end(); ++i) { 801 if ((*i)->matches(*this)) { 802 (*i)->run(*this); 803 break; 804 } 805 } 806 807 } 808 809 810 static void 811 process_event(char *buffer) 812 { 813 char type; 814 char *sp; 815 struct timeval tv; 816 char *timestr; 817 818 sp = buffer + 1; 819 devdlog(LOG_INFO, "Processing event '%s'\n", buffer); 820 type = *buffer++; 821 cfg.push_var_table(); 822 // $* is the entire line 823 cfg.set_variable("*", buffer - 1); 824 // $_ is the entire line without the initial character 825 cfg.set_variable("_", buffer); 826 827 // Save the time this happened (as approximated by when we got 828 // around to processing it). 829 gettimeofday(&tv, NULL); 830 asprintf(×tr, "%jd.%06ld", (uintmax_t)tv.tv_sec, tv.tv_usec); 831 cfg.set_variable("timestamp", timestr); 832 free(timestr); 833 834 // Match doesn't have a device, and the format is a little 835 // different, so handle it separately. 836 switch (type) { 837 case notify: 838 //! (k=v)* 839 sp = cfg.set_vars(sp); 840 break; 841 case nomatch: 842 //? at location pnp-info on bus 843 sp = strchr(sp, ' '); 844 if (sp == NULL) 845 return; /* Can't happen? */ 846 *sp++ = '\0'; 847 while (isspace(*sp)) 848 sp++; 849 if (strncmp(sp, "at ", 3) == 0) 850 sp += 3; 851 sp = cfg.set_vars(sp); 852 while (isspace(*sp)) 853 sp++; 854 if (strncmp(sp, "on ", 3) == 0) 855 cfg.set_variable("bus", sp + 3); 856 break; 857 case attach: /*FALLTHROUGH*/ 858 case detach: 859 sp = strchr(sp, ' '); 860 if (sp == NULL) 861 return; /* Can't happen? */ 862 *sp++ = '\0'; 863 cfg.set_variable("device-name", buffer); 864 while (isspace(*sp)) 865 sp++; 866 if (strncmp(sp, "at ", 3) == 0) 867 sp += 3; 868 sp = cfg.set_vars(sp); 869 while (isspace(*sp)) 870 sp++; 871 if (strncmp(sp, "on ", 3) == 0) 872 cfg.set_variable("bus", sp + 3); 873 break; 874 } 875 876 cfg.find_and_execute(type); 877 cfg.pop_var_table(); 878 } 879 880 int 881 create_socket(const char *name, int socktype) 882 { 883 int fd, slen; 884 struct sockaddr_un sun; 885 886 if ((fd = socket(PF_LOCAL, socktype, 0)) < 0) 887 err(1, "socket"); 888 bzero(&sun, sizeof(sun)); 889 sun.sun_family = AF_UNIX; 890 strlcpy(sun.sun_path, name, sizeof(sun.sun_path)); 891 slen = SUN_LEN(&sun); 892 unlink(name); 893 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 894 err(1, "fcntl"); 895 if (::bind(fd, (struct sockaddr *) & sun, slen) < 0) 896 err(1, "bind"); 897 listen(fd, 4); 898 if (chown(name, 0, 0)) /* XXX - root.wheel */ 899 err(1, "chown"); 900 if (chmod(name, 0666)) 901 err(1, "chmod"); 902 return (fd); 903 } 904 905 unsigned int max_clients = 10; /* Default, can be overridden on cmdline. */ 906 unsigned int num_clients; 907 908 list<client_t> clients; 909 910 void 911 notify_clients(const char *data, int len) 912 { 913 list<client_t>::iterator i; 914 915 /* 916 * Deliver the data to all clients. Throw clients overboard at the 917 * first sign of trouble. This reaps clients who've died or closed 918 * their sockets, and also clients who are alive but failing to keep up 919 * (or who are maliciously not reading, to consume buffer space in 920 * kernel memory or tie up the limited number of available connections). 921 */ 922 for (i = clients.begin(); i != clients.end(); ) { 923 int flags; 924 if (i->socktype == SOCK_SEQPACKET) 925 flags = MSG_EOR; 926 else 927 flags = 0; 928 929 if (send(i->fd, data, len, flags) != len) { 930 --num_clients; 931 close(i->fd); 932 i = clients.erase(i); 933 devdlog(LOG_WARNING, "notify_clients: send() failed; " 934 "dropping unresponsive client\n"); 935 } else 936 ++i; 937 } 938 } 939 940 void 941 check_clients(void) 942 { 943 int s; 944 struct pollfd pfd; 945 list<client_t>::iterator i; 946 947 /* 948 * Check all existing clients to see if any of them have disappeared. 949 * Normally we reap clients when we get an error trying to send them an 950 * event. This check eliminates the problem of an ever-growing list of 951 * zombie clients because we're never writing to them on a system 952 * without frequent device-change activity. 953 */ 954 pfd.events = 0; 955 for (i = clients.begin(); i != clients.end(); ) { 956 pfd.fd = i->fd; 957 s = poll(&pfd, 1, 0); 958 if ((s < 0 && s != EINTR ) || 959 (s > 0 && (pfd.revents & POLLHUP))) { 960 --num_clients; 961 close(i->fd); 962 i = clients.erase(i); 963 devdlog(LOG_NOTICE, "check_clients: " 964 "dropping disconnected client\n"); 965 } else 966 ++i; 967 } 968 } 969 970 void 971 new_client(int fd, int socktype) 972 { 973 client_t s; 974 int sndbuf_size; 975 976 /* 977 * First go reap any zombie clients, then accept the connection, and 978 * shut down the read side to stop clients from consuming kernel memory 979 * by sending large buffers full of data we'll never read. 980 */ 981 check_clients(); 982 s.socktype = socktype; 983 s.fd = accept(fd, NULL, NULL); 984 if (s.fd != -1) { 985 sndbuf_size = CLIENT_BUFSIZE; 986 if (setsockopt(s.fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, 987 sizeof(sndbuf_size))) 988 err(1, "setsockopt"); 989 shutdown(s.fd, SHUT_RD); 990 clients.push_back(s); 991 ++num_clients; 992 } else 993 err(1, "accept"); 994 } 995 996 static void 997 event_loop(void) 998 { 999 int rv; 1000 int fd; 1001 char buffer[DEVCTL_MAXBUF]; 1002 int once = 0; 1003 int stream_fd, seqpacket_fd, max_fd; 1004 int accepting; 1005 timeval tv; 1006 fd_set fds; 1007 1008 fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC); 1009 if (fd == -1) 1010 err(1, "Can't open devctl device %s", PATH_DEVCTL); 1011 stream_fd = create_socket(STREAMPIPE, SOCK_STREAM); 1012 seqpacket_fd = create_socket(SEQPACKETPIPE, SOCK_SEQPACKET); 1013 accepting = 1; 1014 max_fd = max(fd, max(stream_fd, seqpacket_fd)) + 1; 1015 while (!romeo_must_die) { 1016 if (!once && !no_daemon && !daemonize_quick) { 1017 // Check to see if we have any events pending. 1018 tv.tv_sec = 0; 1019 tv.tv_usec = 0; 1020 FD_ZERO(&fds); 1021 FD_SET(fd, &fds); 1022 rv = select(fd + 1, &fds, &fds, &fds, &tv); 1023 // No events -> we've processed all pending events 1024 if (rv == 0) { 1025 devdlog(LOG_DEBUG, "Calling daemon\n"); 1026 cfg.remove_pidfile(); 1027 cfg.open_pidfile(); 1028 daemon(0, 0); 1029 cfg.write_pidfile(); 1030 once++; 1031 } 1032 } 1033 /* 1034 * When we've already got the max number of clients, stop 1035 * accepting new connections (don't put the listening sockets in 1036 * the set), shrink the accept() queue to reject connections 1037 * quickly, and poll the existing clients more often, so that we 1038 * notice more quickly when any of them disappear to free up 1039 * client slots. 1040 */ 1041 FD_ZERO(&fds); 1042 FD_SET(fd, &fds); 1043 if (num_clients < max_clients) { 1044 if (!accepting) { 1045 listen(stream_fd, max_clients); 1046 listen(seqpacket_fd, max_clients); 1047 accepting = 1; 1048 } 1049 FD_SET(stream_fd, &fds); 1050 FD_SET(seqpacket_fd, &fds); 1051 tv.tv_sec = 60; 1052 tv.tv_usec = 0; 1053 } else { 1054 if (accepting) { 1055 listen(stream_fd, 0); 1056 listen(seqpacket_fd, 0); 1057 accepting = 0; 1058 } 1059 tv.tv_sec = 2; 1060 tv.tv_usec = 0; 1061 } 1062 rv = select(max_fd, &fds, NULL, NULL, &tv); 1063 if (got_siginfo) { 1064 devdlog(LOG_NOTICE, "Events received so far=%u\n", 1065 total_events); 1066 got_siginfo = 0; 1067 } 1068 if (rv == -1) { 1069 if (errno == EINTR) 1070 continue; 1071 err(1, "select"); 1072 } else if (rv == 0) 1073 check_clients(); 1074 if (FD_ISSET(fd, &fds)) { 1075 rv = read(fd, buffer, sizeof(buffer) - 1); 1076 if (rv > 0) { 1077 total_events++; 1078 if (rv == sizeof(buffer) - 1) { 1079 devdlog(LOG_WARNING, "Warning: " 1080 "available event data exceeded " 1081 "buffer space\n"); 1082 } 1083 notify_clients(buffer, rv); 1084 buffer[rv] = '\0'; 1085 while (buffer[--rv] == '\n') 1086 buffer[rv] = '\0'; 1087 try { 1088 process_event(buffer); 1089 } 1090 catch (std::length_error e) { 1091 devdlog(LOG_ERR, "Dropping event %s " 1092 "due to low memory", buffer); 1093 } 1094 } else if (rv < 0) { 1095 if (errno != EINTR) 1096 break; 1097 } else { 1098 /* EOF */ 1099 break; 1100 } 1101 } 1102 if (FD_ISSET(stream_fd, &fds)) 1103 new_client(stream_fd, SOCK_STREAM); 1104 /* 1105 * Aside from the socket type, both sockets use the same 1106 * protocol, so we can process clients the same way. 1107 */ 1108 if (FD_ISSET(seqpacket_fd, &fds)) 1109 new_client(seqpacket_fd, SOCK_SEQPACKET); 1110 } 1111 close(seqpacket_fd); 1112 close(stream_fd); 1113 close(fd); 1114 } 1115 1116 /* 1117 * functions that the parser uses. 1118 */ 1119 void 1120 add_attach(int prio, event_proc *p) 1121 { 1122 cfg.add_attach(prio, p); 1123 } 1124 1125 void 1126 add_detach(int prio, event_proc *p) 1127 { 1128 cfg.add_detach(prio, p); 1129 } 1130 1131 void 1132 add_directory(const char *dir) 1133 { 1134 cfg.add_directory(dir); 1135 free(const_cast<char *>(dir)); 1136 } 1137 1138 void 1139 add_nomatch(int prio, event_proc *p) 1140 { 1141 cfg.add_nomatch(prio, p); 1142 } 1143 1144 void 1145 add_notify(int prio, event_proc *p) 1146 { 1147 cfg.add_notify(prio, p); 1148 } 1149 1150 event_proc * 1151 add_to_event_proc(event_proc *ep, eps *eps) 1152 { 1153 if (ep == NULL) 1154 ep = new event_proc(); 1155 ep->add(eps); 1156 return (ep); 1157 } 1158 1159 eps * 1160 new_action(const char *cmd) 1161 { 1162 eps *e = new action(cmd); 1163 free(const_cast<char *>(cmd)); 1164 return (e); 1165 } 1166 1167 eps * 1168 new_match(const char *var, const char *re) 1169 { 1170 eps *e = new match(cfg, var, re); 1171 free(const_cast<char *>(var)); 1172 free(const_cast<char *>(re)); 1173 return (e); 1174 } 1175 1176 eps * 1177 new_media(const char *var, const char *re) 1178 { 1179 eps *e = new media(cfg, var, re); 1180 free(const_cast<char *>(var)); 1181 free(const_cast<char *>(re)); 1182 return (e); 1183 } 1184 1185 void 1186 set_pidfile(const char *name) 1187 { 1188 cfg.set_pidfile(name); 1189 free(const_cast<char *>(name)); 1190 } 1191 1192 void 1193 set_variable(const char *var, const char *val) 1194 { 1195 cfg.set_variable(var, val); 1196 free(const_cast<char *>(var)); 1197 free(const_cast<char *>(val)); 1198 } 1199 1200 1201 1202 static void 1203 gensighand(int) 1204 { 1205 romeo_must_die = 1; 1206 } 1207 1208 /* 1209 * SIGINFO handler. Will print useful statistics to the syslog or stderr 1210 * as appropriate 1211 */ 1212 static void 1213 siginfohand(int) 1214 { 1215 got_siginfo = 1; 1216 } 1217 1218 /* 1219 * Local logging function. Prints to syslog if we're daemonized; stderr 1220 * otherwise. 1221 */ 1222 static void 1223 devdlog(int priority, const char* fmt, ...) 1224 { 1225 va_list argp; 1226 1227 va_start(argp, fmt); 1228 if (no_daemon) 1229 vfprintf(stderr, fmt, argp); 1230 else if (quiet_mode == 0 || priority <= LOG_WARNING) 1231 vsyslog(priority, fmt, argp); 1232 va_end(argp); 1233 } 1234 1235 static void 1236 usage() 1237 { 1238 fprintf(stderr, "usage: %s [-dnq] [-l connlimit] [-f file]\n", 1239 getprogname()); 1240 exit(1); 1241 } 1242 1243 static void 1244 check_devd_enabled() 1245 { 1246 int val = 0; 1247 size_t len; 1248 1249 len = sizeof(val); 1250 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0) 1251 errx(1, "devctl sysctl missing from kernel!"); 1252 if (val == 0) { 1253 warnx("Setting " SYSCTL " to 1000"); 1254 val = 1000; 1255 if (sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val))) 1256 err(1, "sysctlbyname"); 1257 } 1258 } 1259 1260 /* 1261 * main 1262 */ 1263 int 1264 main(int argc, char **argv) 1265 { 1266 int ch; 1267 1268 check_devd_enabled(); 1269 while ((ch = getopt(argc, argv, "df:l:nq")) != -1) { 1270 switch (ch) { 1271 case 'd': 1272 no_daemon = 1; 1273 break; 1274 case 'f': 1275 configfile = optarg; 1276 break; 1277 case 'l': 1278 max_clients = MAX(1, strtoul(optarg, NULL, 0)); 1279 break; 1280 case 'n': 1281 daemonize_quick = 1; 1282 break; 1283 case 'q': 1284 quiet_mode = 1; 1285 break; 1286 default: 1287 usage(); 1288 } 1289 } 1290 1291 cfg.parse(); 1292 if (!no_daemon && daemonize_quick) { 1293 cfg.open_pidfile(); 1294 daemon(0, 0); 1295 cfg.write_pidfile(); 1296 } 1297 signal(SIGPIPE, SIG_IGN); 1298 signal(SIGHUP, gensighand); 1299 signal(SIGINT, gensighand); 1300 signal(SIGTERM, gensighand); 1301 signal(SIGINFO, siginfohand); 1302 event_loop(); 1303 return (0); 1304 } 1305