1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause AND BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002-2010 M. Warner Losh <imp@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * my_system is a variation on lib/libc/stdlib/system.c: 28 * 29 * Copyright (c) 1988, 1993 30 * The Regents of the University of California. All rights reserved. 31 * 32 * Redistribution and use in source and binary forms, with or without 33 * modification, are permitted provided that the following conditions 34 * are met: 35 * 1. Redistributions of source code must retain the above copyright 36 * notice, this list of conditions and the following disclaimer. 37 * 2. Redistributions in binary form must reproduce the above copyright 38 * notice, this list of conditions and the following disclaimer in the 39 * documentation and/or other materials provided with the distribution. 40 * 3. Neither the name of the University nor the names of its contributors 41 * may be used to endorse or promote products derived from this software 42 * without specific prior written permission. 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 47 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 54 * SUCH DAMAGE. 55 */ 56 57 /* 58 * DEVD control daemon. 59 */ 60 61 // TODO list: 62 // o devd.conf and devd man pages need a lot of help: 63 // - devd needs to document the unix domain socket 64 // - devd.conf needs more details on the supported statements. 65 66 #include <sys/cdefs.h> 67 __FBSDID("$FreeBSD$"); 68 69 #include <sys/param.h> 70 #include <sys/socket.h> 71 #include <sys/stat.h> 72 #include <sys/sysctl.h> 73 #include <sys/types.h> 74 #include <sys/wait.h> 75 #include <sys/un.h> 76 77 #include <cctype> 78 #include <cerrno> 79 #include <cstdlib> 80 #include <cstdio> 81 #include <csignal> 82 #include <cstring> 83 #include <cstdarg> 84 85 #include <dirent.h> 86 #include <err.h> 87 #include <fcntl.h> 88 #include <libutil.h> 89 #include <paths.h> 90 #include <poll.h> 91 #include <regex.h> 92 #include <syslog.h> 93 #include <unistd.h> 94 95 #include <algorithm> 96 #include <map> 97 #include <string> 98 #include <list> 99 #include <stdexcept> 100 #include <vector> 101 102 #include "devd.h" /* C compatible definitions */ 103 #include "devd.hh" /* C++ class definitions */ 104 105 #define STREAMPIPE "/var/run/devd.pipe" 106 #define SEQPACKETPIPE "/var/run/devd.seqpacket.pipe" 107 #define CF "/etc/devd.conf" 108 #define SYSCTL "hw.bus.devctl_queue" 109 110 /* 111 * Since the client socket is nonblocking, we must increase its send buffer to 112 * handle brief event storms. On FreeBSD, AF_UNIX sockets don't have a receive 113 * buffer, so the client can't increase the buffersize by itself. 114 * 115 * For example, when creating a ZFS pool, devd emits one 165 character 116 * resource.fs.zfs.statechange message for each vdev in the pool. The kernel 117 * allocates a 4608B mbuf for each message. Modern technology places a limit of 118 * roughly 450 drives/rack, and it's unlikely that a zpool will ever be larger 119 * than that. 120 * 121 * 450 drives * 165 bytes / drive = 74250B of data in the sockbuf 122 * 450 drives * 4608B / drive = 2073600B of mbufs in the sockbuf 123 * 124 * We can't directly set the sockbuf's mbuf limit, but we can do it indirectly. 125 * The kernel sets it to the minimum of a hard-coded maximum value and sbcc * 126 * kern.ipc.sockbuf_waste_factor, where sbcc is the socket buffer size set by 127 * the user. The default value of kern.ipc.sockbuf_waste_factor is 8. If we 128 * set the bufsize to 256k and use the kern.ipc.sockbuf_waste_factor, then the 129 * kernel will set the mbuf limit to 2MB, which is just large enough for 450 130 * drives. It also happens to be the same as the hardcoded maximum value. 131 */ 132 #define CLIENT_BUFSIZE 262144 133 134 using namespace std; 135 136 typedef struct client { 137 int fd; 138 int socktype; 139 } client_t; 140 141 extern FILE *yyin; 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) __dead2; 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 static 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_IEEE80211, "802.11" }, 335 { IFM_ATM, "ATM" }, 336 { -1, "unknown" }, 337 { 0, NULL }, 338 }; 339 for (int i = 0; media_types[i].ifmt_string != NULL; ++i) 340 if (strcasecmp(type, media_types[i].ifmt_string) == 0) { 341 _type = media_types[i].ifmt_word; 342 break; 343 } 344 } 345 346 media::~media() 347 { 348 } 349 350 bool 351 media::do_match(config &c) 352 { 353 string value; 354 struct ifmediareq ifmr; 355 bool retval; 356 int s; 357 358 // Since we can be called from both a device attach/detach 359 // context where device-name is defined and what we want, 360 // as well as from a link status context, where subsystem is 361 // the name of interest, first try device-name and fall back 362 // to subsystem if none exists. 363 value = c.get_variable("device-name"); 364 if (value.empty()) 365 value = c.get_variable("subsystem"); 366 devdlog(LOG_DEBUG, "Testing media type of %s against 0x%x\n", 367 value.c_str(), _type); 368 369 retval = false; 370 371 s = socket(PF_INET, SOCK_DGRAM, 0); 372 if (s >= 0) { 373 memset(&ifmr, 0, sizeof(ifmr)); 374 strlcpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name)); 375 376 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 && 377 ifmr.ifm_status & IFM_AVALID) { 378 devdlog(LOG_DEBUG, "%s has media type 0x%x\n", 379 value.c_str(), IFM_TYPE(ifmr.ifm_active)); 380 retval = (IFM_TYPE(ifmr.ifm_active) == _type); 381 } else if (_type == -1) { 382 devdlog(LOG_DEBUG, "%s has unknown media type\n", 383 value.c_str()); 384 retval = true; 385 } 386 close(s); 387 } 388 389 return (retval); 390 } 391 392 const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_"; 393 const string var_list::nothing = ""; 394 395 const string & 396 var_list::get_variable(const string &var) const 397 { 398 map<string, string>::const_iterator i; 399 400 i = _vars.find(var); 401 if (i == _vars.end()) 402 return (var_list::bogus); 403 return (i->second); 404 } 405 406 bool 407 var_list::is_set(const string &var) const 408 { 409 return (_vars.find(var) != _vars.end()); 410 } 411 412 /** fix_value 413 * 414 * Removes quoted characters that have made it this far. \" are 415 * converted to ". For all other characters, both \ and following 416 * character. So the string 'fre\:\"' is translated to 'fred\:"'. 417 */ 418 std::string 419 var_list::fix_value(const std::string &val) const 420 { 421 std::string rv(val); 422 std::string::size_type pos(0); 423 424 while ((pos = rv.find("\\\"", pos)) != rv.npos) { 425 rv.erase(pos, 1); 426 } 427 return (rv); 428 } 429 430 void 431 var_list::set_variable(const string &var, const string &val) 432 { 433 /* 434 * This function gets called WAY too often to justify calling syslog() 435 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 436 * can consume excessive amounts of systime inside of connect(). Only 437 * log when we're in -d mode. 438 */ 439 _vars[var] = fix_value(val); 440 if (no_daemon) 441 devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str()); 442 } 443 444 void 445 config::reset(void) 446 { 447 _dir_list.clear(); 448 delete_and_clear(_var_list_table); 449 delete_and_clear(_attach_list); 450 delete_and_clear(_detach_list); 451 delete_and_clear(_nomatch_list); 452 delete_and_clear(_notify_list); 453 } 454 455 void 456 config::parse_one_file(const char *fn) 457 { 458 devdlog(LOG_DEBUG, "Parsing %s\n", fn); 459 yyin = fopen(fn, "r"); 460 if (yyin == NULL) 461 err(1, "Cannot open config file %s", fn); 462 lineno = 1; 463 if (yyparse() != 0) 464 errx(1, "Cannot parse %s at line %d", fn, lineno); 465 fclose(yyin); 466 } 467 468 void 469 config::parse_files_in_dir(const char *dirname) 470 { 471 DIR *dirp; 472 struct dirent *dp; 473 char path[PATH_MAX]; 474 475 devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname); 476 dirp = opendir(dirname); 477 if (dirp == NULL) 478 return; 479 readdir(dirp); /* Skip . */ 480 readdir(dirp); /* Skip .. */ 481 while ((dp = readdir(dirp)) != NULL) { 482 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) { 483 snprintf(path, sizeof(path), "%s/%s", 484 dirname, dp->d_name); 485 parse_one_file(path); 486 } 487 } 488 closedir(dirp); 489 } 490 491 class epv_greater { 492 public: 493 int operator()(event_proc *const&l1, event_proc *const&l2) const 494 { 495 return (l1->get_priority() > l2->get_priority()); 496 } 497 }; 498 499 void 500 config::sort_vector(vector<event_proc *> &v) 501 { 502 stable_sort(v.begin(), v.end(), epv_greater()); 503 } 504 505 void 506 config::parse(void) 507 { 508 vector<string>::const_iterator i; 509 510 parse_one_file(configfile); 511 for (i = _dir_list.begin(); i != _dir_list.end(); ++i) 512 parse_files_in_dir((*i).c_str()); 513 sort_vector(_attach_list); 514 sort_vector(_detach_list); 515 sort_vector(_nomatch_list); 516 sort_vector(_notify_list); 517 } 518 519 void 520 config::open_pidfile() 521 { 522 pid_t otherpid; 523 524 if (_pidfile.empty()) 525 return; 526 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid); 527 if (pfh == NULL) { 528 if (errno == EEXIST) 529 errx(1, "devd already running, pid: %d", (int)otherpid); 530 warn("cannot open pid file"); 531 } 532 } 533 534 void 535 config::write_pidfile() 536 { 537 538 pidfile_write(pfh); 539 } 540 541 void 542 config::close_pidfile() 543 { 544 545 pidfile_close(pfh); 546 } 547 548 void 549 config::remove_pidfile() 550 { 551 552 pidfile_remove(pfh); 553 } 554 555 void 556 config::add_attach(int prio, event_proc *p) 557 { 558 p->set_priority(prio); 559 _attach_list.push_back(p); 560 } 561 562 void 563 config::add_detach(int prio, event_proc *p) 564 { 565 p->set_priority(prio); 566 _detach_list.push_back(p); 567 } 568 569 void 570 config::add_directory(const char *dir) 571 { 572 _dir_list.push_back(string(dir)); 573 } 574 575 void 576 config::add_nomatch(int prio, event_proc *p) 577 { 578 p->set_priority(prio); 579 _nomatch_list.push_back(p); 580 } 581 582 void 583 config::add_notify(int prio, event_proc *p) 584 { 585 p->set_priority(prio); 586 _notify_list.push_back(p); 587 } 588 589 void 590 config::set_pidfile(const char *fn) 591 { 592 _pidfile = fn; 593 } 594 595 void 596 config::push_var_table() 597 { 598 var_list *vl; 599 600 vl = new var_list(); 601 _var_list_table.push_back(vl); 602 devdlog(LOG_DEBUG, "Pushing table\n"); 603 } 604 605 void 606 config::pop_var_table() 607 { 608 delete _var_list_table.back(); 609 _var_list_table.pop_back(); 610 devdlog(LOG_DEBUG, "Popping table\n"); 611 } 612 613 void 614 config::set_variable(const char *var, const char *val) 615 { 616 _var_list_table.back()->set_variable(var, val); 617 } 618 619 const string & 620 config::get_variable(const string &var) 621 { 622 vector<var_list *>::reverse_iterator i; 623 624 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) { 625 if ((*i)->is_set(var)) 626 return ((*i)->get_variable(var)); 627 } 628 return (var_list::nothing); 629 } 630 631 bool 632 config::is_id_char(char ch) const 633 { 634 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' || 635 ch == '-')); 636 } 637 638 string 639 config::shell_quote(const string &s) 640 { 641 string buffer; 642 const char *cs, *ce; 643 char c; 644 645 /* 646 * Enclose the string in $' ' with escapes for ' and / characters making 647 * it one argument and ensuring the shell won't be affected by its 648 * usual list of candidates. 649 */ 650 buffer.reserve(s.length() * 3 / 2); 651 buffer += '$'; 652 buffer += '\''; 653 cs = s.c_str(); 654 ce = cs + strlen(cs); 655 for (; cs < ce; cs++) { 656 c = *cs; 657 if (c == '\'' || c == '\\') { 658 buffer += '\\'; 659 } 660 buffer += c; 661 } 662 buffer += '\''; 663 664 return buffer; 665 } 666 667 void 668 config::expand_one(const char *&src, string &dst, bool is_shell) 669 { 670 int count; 671 string buffer; 672 673 src++; 674 // $$ -> $ 675 if (*src == '$') { 676 dst += *src++; 677 return; 678 } 679 680 // $(foo) -> $(foo) 681 // This is the escape hatch for passing down shell subcommands 682 if (*src == '(') { 683 dst += '$'; 684 count = 0; 685 /* If the string ends before ) is matched , return. */ 686 do { 687 if (*src == ')') 688 count--; 689 else if (*src == '(') 690 count++; 691 dst += *src++; 692 } while (count > 0 && *src); 693 return; 694 } 695 696 // $[^-A-Za-z_*] -> $\1 697 if (!isalpha(*src) && *src != '_' && *src != '-' && *src != '*') { 698 dst += '$'; 699 dst += *src++; 700 return; 701 } 702 703 // $var -> replace with value 704 do { 705 buffer += *src++; 706 } while (is_id_char(*src)); 707 dst.append(is_shell ? shell_quote(get_variable(buffer)) : get_variable(buffer)); 708 } 709 710 const string 711 config::expand_string(const char *src, const char *prepend, const char *append) 712 { 713 const char *var_at; 714 string dst; 715 716 /* 717 * 128 bytes is enough for 2427 of 2438 expansions that happen 718 * while parsing config files, as tested on 2013-01-30. 719 */ 720 dst.reserve(128); 721 722 if (prepend != NULL) 723 dst = prepend; 724 725 for (;;) { 726 var_at = strchr(src, '$'); 727 if (var_at == NULL) { 728 dst.append(src); 729 break; 730 } 731 dst.append(src, var_at - src); 732 src = var_at; 733 expand_one(src, dst, prepend == NULL); 734 } 735 736 if (append != NULL) 737 dst.append(append); 738 739 return (dst); 740 } 741 742 bool 743 config::chop_var(char *&buffer, char *&lhs, char *&rhs) const 744 { 745 char *walker; 746 747 if (*buffer == '\0') 748 return (false); 749 walker = lhs = buffer; 750 while (is_id_char(*walker)) 751 walker++; 752 if (*walker != '=') 753 return (false); 754 walker++; // skip = 755 if (*walker == '"') { 756 walker++; // skip " 757 rhs = walker; 758 while (*walker && *walker != '"') { 759 // Skip \" ... We leave it in the string and strip the \ later. 760 // due to the super simplistic parser that we have here. 761 if (*walker == '\\' && walker[1] == '"') 762 walker++; 763 walker++; 764 } 765 if (*walker != '"') 766 return (false); 767 rhs[-2] = '\0'; 768 *walker++ = '\0'; 769 } else { 770 rhs = walker; 771 while (*walker && !isspace(*walker)) 772 walker++; 773 if (*walker != '\0') 774 *walker++ = '\0'; 775 rhs[-1] = '\0'; 776 } 777 while (isspace(*walker)) 778 walker++; 779 buffer = walker; 780 return (true); 781 } 782 783 784 char * 785 config::set_vars(char *buffer) 786 { 787 char *lhs; 788 char *rhs; 789 790 while (1) { 791 if (!chop_var(buffer, lhs, rhs)) 792 break; 793 set_variable(lhs, rhs); 794 } 795 return (buffer); 796 } 797 798 void 799 config::find_and_execute(char type) 800 { 801 vector<event_proc *> *l; 802 vector<event_proc *>::const_iterator i; 803 const char *s; 804 805 switch (type) { 806 default: 807 return; 808 case notify: 809 l = &_notify_list; 810 s = "notify"; 811 break; 812 case nomatch: 813 l = &_nomatch_list; 814 s = "nomatch"; 815 break; 816 case attach: 817 l = &_attach_list; 818 s = "attach"; 819 break; 820 case detach: 821 l = &_detach_list; 822 s = "detach"; 823 break; 824 } 825 devdlog(LOG_DEBUG, "Processing %s event\n", s); 826 for (i = l->begin(); i != l->end(); ++i) { 827 if ((*i)->matches(*this)) { 828 (*i)->run(*this); 829 break; 830 } 831 } 832 833 } 834 835 836 static void 837 process_event(char *buffer) 838 { 839 char type; 840 char *sp; 841 struct timeval tv; 842 char *timestr; 843 844 sp = buffer + 1; 845 devdlog(LOG_INFO, "Processing event '%s'\n", buffer); 846 type = *buffer++; 847 cfg.push_var_table(); 848 // $* is the entire line 849 cfg.set_variable("*", buffer - 1); 850 // $_ is the entire line without the initial character 851 cfg.set_variable("_", buffer); 852 853 // Save the time this happened (as approximated by when we got 854 // around to processing it). 855 gettimeofday(&tv, NULL); 856 asprintf(×tr, "%jd.%06ld", (uintmax_t)tv.tv_sec, tv.tv_usec); 857 cfg.set_variable("timestamp", timestr); 858 free(timestr); 859 860 // Match doesn't have a device, and the format is a little 861 // different, so handle it separately. 862 switch (type) { 863 case notify: 864 //! (k=v)* 865 sp = cfg.set_vars(sp); 866 break; 867 case nomatch: 868 //? at location pnp-info on bus 869 sp = strchr(sp, ' '); 870 if (sp == NULL) 871 return; /* Can't happen? */ 872 *sp++ = '\0'; 873 while (isspace(*sp)) 874 sp++; 875 if (strncmp(sp, "at ", 3) == 0) 876 sp += 3; 877 sp = cfg.set_vars(sp); 878 while (isspace(*sp)) 879 sp++; 880 if (strncmp(sp, "on ", 3) == 0) 881 cfg.set_variable("bus", sp + 3); 882 break; 883 case attach: /*FALLTHROUGH*/ 884 case detach: 885 sp = strchr(sp, ' '); 886 if (sp == NULL) 887 return; /* Can't happen? */ 888 *sp++ = '\0'; 889 cfg.set_variable("device-name", buffer); 890 while (isspace(*sp)) 891 sp++; 892 if (strncmp(sp, "at ", 3) == 0) 893 sp += 3; 894 sp = cfg.set_vars(sp); 895 while (isspace(*sp)) 896 sp++; 897 if (strncmp(sp, "on ", 3) == 0) 898 cfg.set_variable("bus", sp + 3); 899 break; 900 } 901 902 cfg.find_and_execute(type); 903 cfg.pop_var_table(); 904 } 905 906 static int 907 create_socket(const char *name, int socktype) 908 { 909 int fd, slen; 910 struct sockaddr_un sun; 911 912 if ((fd = socket(PF_LOCAL, socktype, 0)) < 0) 913 err(1, "socket"); 914 bzero(&sun, sizeof(sun)); 915 sun.sun_family = AF_UNIX; 916 strlcpy(sun.sun_path, name, sizeof(sun.sun_path)); 917 slen = SUN_LEN(&sun); 918 unlink(name); 919 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 920 err(1, "fcntl"); 921 if (::bind(fd, (struct sockaddr *) & sun, slen) < 0) 922 err(1, "bind"); 923 listen(fd, 4); 924 if (chown(name, 0, 0)) /* XXX - root.wheel */ 925 err(1, "chown"); 926 if (chmod(name, 0666)) 927 err(1, "chmod"); 928 return (fd); 929 } 930 931 static unsigned int max_clients = 10; /* Default, can be overridden on cmdline. */ 932 static unsigned int num_clients; 933 934 static list<client_t> clients; 935 936 static void 937 notify_clients(const char *data, int len) 938 { 939 list<client_t>::iterator i; 940 941 /* 942 * Deliver the data to all clients. Throw clients overboard at the 943 * first sign of trouble. This reaps clients who've died or closed 944 * their sockets, and also clients who are alive but failing to keep up 945 * (or who are maliciously not reading, to consume buffer space in 946 * kernel memory or tie up the limited number of available connections). 947 */ 948 for (i = clients.begin(); i != clients.end(); ) { 949 int flags; 950 if (i->socktype == SOCK_SEQPACKET) 951 flags = MSG_EOR; 952 else 953 flags = 0; 954 955 if (send(i->fd, data, len, flags) != len) { 956 --num_clients; 957 close(i->fd); 958 i = clients.erase(i); 959 devdlog(LOG_WARNING, "notify_clients: send() failed; " 960 "dropping unresponsive client\n"); 961 } else 962 ++i; 963 } 964 } 965 966 static void 967 check_clients(void) 968 { 969 int s; 970 struct pollfd pfd; 971 list<client_t>::iterator i; 972 973 /* 974 * Check all existing clients to see if any of them have disappeared. 975 * Normally we reap clients when we get an error trying to send them an 976 * event. This check eliminates the problem of an ever-growing list of 977 * zombie clients because we're never writing to them on a system 978 * without frequent device-change activity. 979 */ 980 pfd.events = 0; 981 for (i = clients.begin(); i != clients.end(); ) { 982 pfd.fd = i->fd; 983 s = poll(&pfd, 1, 0); 984 if ((s < 0 && s != EINTR ) || 985 (s > 0 && (pfd.revents & POLLHUP))) { 986 --num_clients; 987 close(i->fd); 988 i = clients.erase(i); 989 devdlog(LOG_NOTICE, "check_clients: " 990 "dropping disconnected client\n"); 991 } else 992 ++i; 993 } 994 } 995 996 static void 997 new_client(int fd, int socktype) 998 { 999 client_t s; 1000 int sndbuf_size; 1001 1002 /* 1003 * First go reap any zombie clients, then accept the connection, and 1004 * shut down the read side to stop clients from consuming kernel memory 1005 * by sending large buffers full of data we'll never read. 1006 */ 1007 check_clients(); 1008 s.socktype = socktype; 1009 s.fd = accept(fd, NULL, NULL); 1010 if (s.fd != -1) { 1011 sndbuf_size = CLIENT_BUFSIZE; 1012 if (setsockopt(s.fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, 1013 sizeof(sndbuf_size))) 1014 err(1, "setsockopt"); 1015 shutdown(s.fd, SHUT_RD); 1016 clients.push_back(s); 1017 ++num_clients; 1018 } else 1019 err(1, "accept"); 1020 } 1021 1022 static void 1023 event_loop(void) 1024 { 1025 int rv; 1026 int fd; 1027 char buffer[DEVCTL_MAXBUF]; 1028 int once = 0; 1029 int stream_fd, seqpacket_fd, max_fd; 1030 int accepting; 1031 timeval tv; 1032 fd_set fds; 1033 1034 fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC); 1035 if (fd == -1) 1036 err(1, "Can't open devctl device %s", PATH_DEVCTL); 1037 stream_fd = create_socket(STREAMPIPE, SOCK_STREAM); 1038 seqpacket_fd = create_socket(SEQPACKETPIPE, SOCK_SEQPACKET); 1039 accepting = 1; 1040 max_fd = max(fd, max(stream_fd, seqpacket_fd)) + 1; 1041 while (!romeo_must_die) { 1042 if (!once && !no_daemon && !daemonize_quick) { 1043 // Check to see if we have any events pending. 1044 tv.tv_sec = 0; 1045 tv.tv_usec = 0; 1046 FD_ZERO(&fds); 1047 FD_SET(fd, &fds); 1048 rv = select(fd + 1, &fds, NULL, NULL, &tv); 1049 // No events -> we've processed all pending events 1050 if (rv == 0) { 1051 devdlog(LOG_DEBUG, "Calling daemon\n"); 1052 cfg.remove_pidfile(); 1053 cfg.open_pidfile(); 1054 daemon(0, 0); 1055 cfg.write_pidfile(); 1056 once++; 1057 } 1058 } 1059 /* 1060 * When we've already got the max number of clients, stop 1061 * accepting new connections (don't put the listening sockets in 1062 * the set), shrink the accept() queue to reject connections 1063 * quickly, and poll the existing clients more often, so that we 1064 * notice more quickly when any of them disappear to free up 1065 * client slots. 1066 */ 1067 FD_ZERO(&fds); 1068 FD_SET(fd, &fds); 1069 if (num_clients < max_clients) { 1070 if (!accepting) { 1071 listen(stream_fd, max_clients); 1072 listen(seqpacket_fd, max_clients); 1073 accepting = 1; 1074 } 1075 FD_SET(stream_fd, &fds); 1076 FD_SET(seqpacket_fd, &fds); 1077 tv.tv_sec = 60; 1078 tv.tv_usec = 0; 1079 } else { 1080 if (accepting) { 1081 listen(stream_fd, 0); 1082 listen(seqpacket_fd, 0); 1083 accepting = 0; 1084 } 1085 tv.tv_sec = 2; 1086 tv.tv_usec = 0; 1087 } 1088 rv = select(max_fd, &fds, NULL, NULL, &tv); 1089 if (got_siginfo) { 1090 devdlog(LOG_NOTICE, "Events received so far=%u\n", 1091 total_events); 1092 got_siginfo = 0; 1093 } 1094 if (rv == -1) { 1095 if (errno == EINTR) 1096 continue; 1097 err(1, "select"); 1098 } else if (rv == 0) 1099 check_clients(); 1100 if (FD_ISSET(fd, &fds)) { 1101 rv = read(fd, buffer, sizeof(buffer) - 1); 1102 if (rv > 0) { 1103 total_events++; 1104 if (rv == sizeof(buffer) - 1) { 1105 devdlog(LOG_WARNING, "Warning: " 1106 "available event data exceeded " 1107 "buffer space\n"); 1108 } 1109 notify_clients(buffer, rv); 1110 buffer[rv] = '\0'; 1111 while (buffer[--rv] == '\n') 1112 buffer[rv] = '\0'; 1113 try { 1114 process_event(buffer); 1115 } 1116 catch (const std::length_error& e) { 1117 devdlog(LOG_ERR, "Dropping event %s " 1118 "due to low memory", buffer); 1119 } 1120 } else if (rv < 0) { 1121 if (errno != EINTR) 1122 break; 1123 } else { 1124 /* EOF */ 1125 break; 1126 } 1127 } 1128 if (FD_ISSET(stream_fd, &fds)) 1129 new_client(stream_fd, SOCK_STREAM); 1130 /* 1131 * Aside from the socket type, both sockets use the same 1132 * protocol, so we can process clients the same way. 1133 */ 1134 if (FD_ISSET(seqpacket_fd, &fds)) 1135 new_client(seqpacket_fd, SOCK_SEQPACKET); 1136 } 1137 cfg.remove_pidfile(); 1138 close(seqpacket_fd); 1139 close(stream_fd); 1140 close(fd); 1141 } 1142 1143 /* 1144 * functions that the parser uses. 1145 */ 1146 void 1147 add_attach(int prio, event_proc *p) 1148 { 1149 cfg.add_attach(prio, p); 1150 } 1151 1152 void 1153 add_detach(int prio, event_proc *p) 1154 { 1155 cfg.add_detach(prio, p); 1156 } 1157 1158 void 1159 add_directory(const char *dir) 1160 { 1161 cfg.add_directory(dir); 1162 free(const_cast<char *>(dir)); 1163 } 1164 1165 void 1166 add_nomatch(int prio, event_proc *p) 1167 { 1168 cfg.add_nomatch(prio, p); 1169 } 1170 1171 void 1172 add_notify(int prio, event_proc *p) 1173 { 1174 cfg.add_notify(prio, p); 1175 } 1176 1177 event_proc * 1178 add_to_event_proc(event_proc *ep, eps *eps) 1179 { 1180 if (ep == NULL) 1181 ep = new event_proc(); 1182 ep->add(eps); 1183 return (ep); 1184 } 1185 1186 eps * 1187 new_action(const char *cmd) 1188 { 1189 eps *e = new action(cmd); 1190 free(const_cast<char *>(cmd)); 1191 return (e); 1192 } 1193 1194 eps * 1195 new_match(const char *var, const char *re) 1196 { 1197 eps *e = new match(cfg, var, re); 1198 free(const_cast<char *>(var)); 1199 free(const_cast<char *>(re)); 1200 return (e); 1201 } 1202 1203 eps * 1204 new_media(const char *var, const char *re) 1205 { 1206 eps *e = new media(cfg, var, re); 1207 free(const_cast<char *>(var)); 1208 free(const_cast<char *>(re)); 1209 return (e); 1210 } 1211 1212 void 1213 set_pidfile(const char *name) 1214 { 1215 cfg.set_pidfile(name); 1216 free(const_cast<char *>(name)); 1217 } 1218 1219 void 1220 set_variable(const char *var, const char *val) 1221 { 1222 cfg.set_variable(var, val); 1223 free(const_cast<char *>(var)); 1224 free(const_cast<char *>(val)); 1225 } 1226 1227 1228 1229 static void 1230 gensighand(int) 1231 { 1232 romeo_must_die = 1; 1233 } 1234 1235 /* 1236 * SIGINFO handler. Will print useful statistics to the syslog or stderr 1237 * as appropriate 1238 */ 1239 static void 1240 siginfohand(int) 1241 { 1242 got_siginfo = 1; 1243 } 1244 1245 /* 1246 * Local logging function. Prints to syslog if we're daemonized; stderr 1247 * otherwise. 1248 */ 1249 static void 1250 devdlog(int priority, const char* fmt, ...) 1251 { 1252 va_list argp; 1253 1254 va_start(argp, fmt); 1255 if (no_daemon) 1256 vfprintf(stderr, fmt, argp); 1257 else if (quiet_mode == 0 || priority <= LOG_WARNING) 1258 vsyslog(priority, fmt, argp); 1259 va_end(argp); 1260 } 1261 1262 static void 1263 usage() 1264 { 1265 fprintf(stderr, "usage: %s [-dnq] [-l connlimit] [-f file]\n", 1266 getprogname()); 1267 exit(1); 1268 } 1269 1270 static void 1271 check_devd_enabled() 1272 { 1273 int val = 0; 1274 size_t len; 1275 1276 len = sizeof(val); 1277 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0) 1278 errx(1, "devctl sysctl missing from kernel!"); 1279 if (val == 0) { 1280 warnx("Setting " SYSCTL " to 1000"); 1281 val = 1000; 1282 if (sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val))) 1283 err(1, "sysctlbyname"); 1284 } 1285 } 1286 1287 /* 1288 * main 1289 */ 1290 int 1291 main(int argc, char **argv) 1292 { 1293 int ch; 1294 1295 check_devd_enabled(); 1296 while ((ch = getopt(argc, argv, "df:l:nq")) != -1) { 1297 switch (ch) { 1298 case 'd': 1299 no_daemon = 1; 1300 break; 1301 case 'f': 1302 configfile = optarg; 1303 break; 1304 case 'l': 1305 max_clients = MAX(1, strtoul(optarg, NULL, 0)); 1306 break; 1307 case 'n': 1308 daemonize_quick = 1; 1309 break; 1310 case 'q': 1311 quiet_mode = 1; 1312 break; 1313 default: 1314 usage(); 1315 } 1316 } 1317 1318 cfg.parse(); 1319 if (!no_daemon && daemonize_quick) { 1320 cfg.open_pidfile(); 1321 daemon(0, 0); 1322 cfg.write_pidfile(); 1323 } 1324 signal(SIGPIPE, SIG_IGN); 1325 signal(SIGHUP, gensighand); 1326 signal(SIGINT, gensighand); 1327 signal(SIGTERM, gensighand); 1328 signal(SIGINFO, siginfohand); 1329 event_loop(); 1330 return (0); 1331 } 1332