1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause AND BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002-2010 M. Warner Losh. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * my_system is a variation on lib/libc/stdlib/system.c: 29 * 30 * Copyright (c) 1988, 1993 31 * The Regents of the University of California. All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58 /* 59 * DEVD control daemon. 60 */ 61 62 // TODO list: 63 // o devd.conf and devd man pages need a lot of help: 64 // - devd needs to document the unix domain socket 65 // - devd.conf needs more details on the supported statements. 66 67 #include <sys/cdefs.h> 68 __FBSDID("$FreeBSD$"); 69 70 #include <sys/param.h> 71 #include <sys/socket.h> 72 #include <sys/stat.h> 73 #include <sys/sysctl.h> 74 #include <sys/types.h> 75 #include <sys/wait.h> 76 #include <sys/un.h> 77 78 #include <cctype> 79 #include <cerrno> 80 #include <cstdlib> 81 #include <cstdio> 82 #include <csignal> 83 #include <cstring> 84 #include <cstdarg> 85 86 #include <dirent.h> 87 #include <err.h> 88 #include <fcntl.h> 89 #include <libutil.h> 90 #include <paths.h> 91 #include <poll.h> 92 #include <regex.h> 93 #include <syslog.h> 94 #include <unistd.h> 95 96 #include <algorithm> 97 #include <map> 98 #include <string> 99 #include <list> 100 #include <stdexcept> 101 #include <vector> 102 103 #include "devd.h" /* C compatible definitions */ 104 #include "devd.hh" /* C++ class definitions */ 105 106 #define STREAMPIPE "/var/run/devd.pipe" 107 #define SEQPACKETPIPE "/var/run/devd.seqpacket.pipe" 108 #define CF "/etc/devd.conf" 109 #define SYSCTL "hw.bus.devctl_queue" 110 111 /* 112 * Since the client socket is nonblocking, we must increase its send buffer to 113 * handle brief event storms. On FreeBSD, AF_UNIX sockets don't have a receive 114 * buffer, so the client can't increase the buffersize by itself. 115 * 116 * For example, when creating a ZFS pool, devd emits one 165 character 117 * resource.fs.zfs.statechange message for each vdev in the pool. The kernel 118 * allocates a 4608B mbuf for each message. Modern technology places a limit of 119 * roughly 450 drives/rack, and it's unlikely that a zpool will ever be larger 120 * than that. 121 * 122 * 450 drives * 165 bytes / drive = 74250B of data in the sockbuf 123 * 450 drives * 4608B / drive = 2073600B of mbufs in the sockbuf 124 * 125 * We can't directly set the sockbuf's mbuf limit, but we can do it indirectly. 126 * The kernel sets it to the minimum of a hard-coded maximum value and sbcc * 127 * kern.ipc.sockbuf_waste_factor, where sbcc is the socket buffer size set by 128 * the user. The default value of kern.ipc.sockbuf_waste_factor is 8. If we 129 * set the bufsize to 256k and use the kern.ipc.sockbuf_waste_factor, then the 130 * kernel will set the mbuf limit to 2MB, which is just large enough for 450 131 * drives. It also happens to be the same as the hardcoded maximum value. 132 */ 133 #define CLIENT_BUFSIZE 262144 134 135 using namespace std; 136 137 typedef struct client { 138 int fd; 139 int socktype; 140 } client_t; 141 142 extern FILE *yyin; 143 144 static const char notify = '!'; 145 static const char nomatch = '?'; 146 static const char attach = '+'; 147 static const char detach = '-'; 148 149 static struct pidfh *pfh; 150 151 static int no_daemon = 0; 152 static int daemonize_quick = 0; 153 static int quiet_mode = 0; 154 static unsigned total_events = 0; 155 static volatile sig_atomic_t got_siginfo = 0; 156 static volatile sig_atomic_t romeo_must_die = 0; 157 158 static const char *configfile = CF; 159 160 static void devdlog(int priority, const char* message, ...) 161 __printflike(2, 3); 162 static void event_loop(void); 163 static void usage(void) __dead2; 164 165 template <class T> void 166 delete_and_clear(vector<T *> &v) 167 { 168 typename vector<T *>::const_iterator i; 169 170 for (i = v.begin(); i != v.end(); ++i) 171 delete *i; 172 v.clear(); 173 } 174 175 static config cfg; 176 177 event_proc::event_proc() : _prio(-1) 178 { 179 _epsvec.reserve(4); 180 } 181 182 event_proc::~event_proc() 183 { 184 delete_and_clear(_epsvec); 185 } 186 187 void 188 event_proc::add(eps *eps) 189 { 190 _epsvec.push_back(eps); 191 } 192 193 bool 194 event_proc::matches(config &c) const 195 { 196 vector<eps *>::const_iterator i; 197 198 for (i = _epsvec.begin(); i != _epsvec.end(); ++i) 199 if (!(*i)->do_match(c)) 200 return (false); 201 return (true); 202 } 203 204 bool 205 event_proc::run(config &c) const 206 { 207 vector<eps *>::const_iterator i; 208 209 for (i = _epsvec.begin(); i != _epsvec.end(); ++i) 210 if (!(*i)->do_action(c)) 211 return (false); 212 return (true); 213 } 214 215 action::action(const char *cmd) 216 : _cmd(cmd) 217 { 218 // nothing 219 } 220 221 action::~action() 222 { 223 // nothing 224 } 225 226 static int 227 my_system(const char *command) 228 { 229 pid_t pid, savedpid; 230 int pstat; 231 struct sigaction ign, intact, quitact; 232 sigset_t newsigblock, oldsigblock; 233 234 if (!command) /* just checking... */ 235 return (1); 236 237 /* 238 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save 239 * existing signal dispositions. 240 */ 241 ign.sa_handler = SIG_IGN; 242 ::sigemptyset(&ign.sa_mask); 243 ign.sa_flags = 0; 244 ::sigaction(SIGINT, &ign, &intact); 245 ::sigaction(SIGQUIT, &ign, &quitact); 246 ::sigemptyset(&newsigblock); 247 ::sigaddset(&newsigblock, SIGCHLD); 248 ::sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); 249 switch (pid = ::fork()) { 250 case -1: /* error */ 251 break; 252 case 0: /* child */ 253 /* 254 * Restore original signal dispositions and exec the command. 255 */ 256 ::sigaction(SIGINT, &intact, NULL); 257 ::sigaction(SIGQUIT, &quitact, NULL); 258 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 259 /* 260 * Close the PID file, and all other open descriptors. 261 * Inherit std{in,out,err} only. 262 */ 263 cfg.close_pidfile(); 264 ::closefrom(3); 265 ::execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); 266 ::_exit(127); 267 default: /* parent */ 268 savedpid = pid; 269 do { 270 pid = ::wait4(savedpid, &pstat, 0, (struct rusage *)0); 271 } while (pid == -1 && errno == EINTR); 272 break; 273 } 274 ::sigaction(SIGINT, &intact, NULL); 275 ::sigaction(SIGQUIT, &quitact, NULL); 276 ::sigprocmask(SIG_SETMASK, &oldsigblock, NULL); 277 return (pid == -1 ? -1 : pstat); 278 } 279 280 bool 281 action::do_action(config &c) 282 { 283 string s = c.expand_string(_cmd.c_str()); 284 devdlog(LOG_INFO, "Executing '%s'\n", s.c_str()); 285 my_system(s.c_str()); 286 return (true); 287 } 288 289 match::match(config &c, const char *var, const char *re) : 290 _inv(re[0] == '!'), 291 _var(var), 292 _re(c.expand_string(_inv ? re + 1 : re, "^", "$")) 293 { 294 regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE); 295 } 296 297 match::~match() 298 { 299 regfree(&_regex); 300 } 301 302 bool 303 match::do_match(config &c) 304 { 305 const string &value = c.get_variable(_var); 306 bool retval; 307 308 /* 309 * This function gets called WAY too often to justify calling syslog() 310 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 311 * can consume excessive amounts of systime inside of connect(). Only 312 * log when we're in -d mode. 313 */ 314 if (no_daemon) { 315 devdlog(LOG_DEBUG, "Testing %s=%s against %s, invert=%d\n", 316 _var.c_str(), value.c_str(), _re.c_str(), _inv); 317 } 318 319 retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0); 320 if (_inv == 1) 321 retval = (retval == 0) ? 1 : 0; 322 323 return (retval); 324 } 325 326 #include <sys/sockio.h> 327 #include <net/if.h> 328 #include <net/if_media.h> 329 330 media::media(config &, const char *var, const char *type) 331 : _var(var), _type(-1) 332 { 333 static struct ifmedia_description media_types[] = { 334 { IFM_ETHER, "Ethernet" }, 335 { IFM_IEEE80211, "802.11" }, 336 { IFM_ATM, "ATM" }, 337 { -1, "unknown" }, 338 { 0, NULL }, 339 }; 340 for (int i = 0; media_types[i].ifmt_string != NULL; ++i) 341 if (strcasecmp(type, media_types[i].ifmt_string) == 0) { 342 _type = media_types[i].ifmt_word; 343 break; 344 } 345 } 346 347 media::~media() 348 { 349 } 350 351 bool 352 media::do_match(config &c) 353 { 354 string value; 355 struct ifmediareq ifmr; 356 bool retval; 357 int s; 358 359 // Since we can be called from both a device attach/detach 360 // context where device-name is defined and what we want, 361 // as well as from a link status context, where subsystem is 362 // the name of interest, first try device-name and fall back 363 // to subsystem if none exists. 364 value = c.get_variable("device-name"); 365 if (value.empty()) 366 value = c.get_variable("subsystem"); 367 devdlog(LOG_DEBUG, "Testing media type of %s against 0x%x\n", 368 value.c_str(), _type); 369 370 retval = false; 371 372 s = socket(PF_INET, SOCK_DGRAM, 0); 373 if (s >= 0) { 374 memset(&ifmr, 0, sizeof(ifmr)); 375 strlcpy(ifmr.ifm_name, value.c_str(), sizeof(ifmr.ifm_name)); 376 377 if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) >= 0 && 378 ifmr.ifm_status & IFM_AVALID) { 379 devdlog(LOG_DEBUG, "%s has media type 0x%x\n", 380 value.c_str(), IFM_TYPE(ifmr.ifm_active)); 381 retval = (IFM_TYPE(ifmr.ifm_active) == _type); 382 } else if (_type == -1) { 383 devdlog(LOG_DEBUG, "%s has unknown media type\n", 384 value.c_str()); 385 retval = true; 386 } 387 close(s); 388 } 389 390 return (retval); 391 } 392 393 const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_"; 394 const string var_list::nothing = ""; 395 396 const string & 397 var_list::get_variable(const string &var) const 398 { 399 map<string, string>::const_iterator i; 400 401 i = _vars.find(var); 402 if (i == _vars.end()) 403 return (var_list::bogus); 404 return (i->second); 405 } 406 407 bool 408 var_list::is_set(const string &var) const 409 { 410 return (_vars.find(var) != _vars.end()); 411 } 412 413 /** fix_value 414 * 415 * Removes quoted characters that have made it this far. \" are 416 * converted to ". For all other characters, both \ and following 417 * character. So the string 'fre\:\"' is translated to 'fred\:"'. 418 */ 419 std::string 420 var_list::fix_value(const std::string &val) const 421 { 422 std::string rv(val); 423 std::string::size_type pos(0); 424 425 while ((pos = rv.find("\\\"", pos)) != rv.npos) { 426 rv.erase(pos, 1); 427 } 428 return (rv); 429 } 430 431 void 432 var_list::set_variable(const string &var, const string &val) 433 { 434 /* 435 * This function gets called WAY too often to justify calling syslog() 436 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 437 * can consume excessive amounts of systime inside of connect(). Only 438 * log when we're in -d mode. 439 */ 440 _vars[var] = fix_value(val); 441 if (no_daemon) 442 devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str()); 443 } 444 445 void 446 config::reset(void) 447 { 448 _dir_list.clear(); 449 delete_and_clear(_var_list_table); 450 delete_and_clear(_attach_list); 451 delete_and_clear(_detach_list); 452 delete_and_clear(_nomatch_list); 453 delete_and_clear(_notify_list); 454 } 455 456 void 457 config::parse_one_file(const char *fn) 458 { 459 devdlog(LOG_DEBUG, "Parsing %s\n", fn); 460 yyin = fopen(fn, "r"); 461 if (yyin == NULL) 462 err(1, "Cannot open config file %s", fn); 463 lineno = 1; 464 if (yyparse() != 0) 465 errx(1, "Cannot parse %s at line %d", fn, lineno); 466 fclose(yyin); 467 } 468 469 void 470 config::parse_files_in_dir(const char *dirname) 471 { 472 DIR *dirp; 473 struct dirent *dp; 474 char path[PATH_MAX]; 475 476 devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname); 477 dirp = opendir(dirname); 478 if (dirp == NULL) 479 return; 480 readdir(dirp); /* Skip . */ 481 readdir(dirp); /* Skip .. */ 482 while ((dp = readdir(dirp)) != NULL) { 483 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) { 484 snprintf(path, sizeof(path), "%s/%s", 485 dirname, dp->d_name); 486 parse_one_file(path); 487 } 488 } 489 closedir(dirp); 490 } 491 492 class epv_greater { 493 public: 494 int operator()(event_proc *const&l1, event_proc *const&l2) const 495 { 496 return (l1->get_priority() > l2->get_priority()); 497 } 498 }; 499 500 void 501 config::sort_vector(vector<event_proc *> &v) 502 { 503 stable_sort(v.begin(), v.end(), epv_greater()); 504 } 505 506 void 507 config::parse(void) 508 { 509 vector<string>::const_iterator i; 510 511 parse_one_file(configfile); 512 for (i = _dir_list.begin(); i != _dir_list.end(); ++i) 513 parse_files_in_dir((*i).c_str()); 514 sort_vector(_attach_list); 515 sort_vector(_detach_list); 516 sort_vector(_nomatch_list); 517 sort_vector(_notify_list); 518 } 519 520 void 521 config::open_pidfile() 522 { 523 pid_t otherpid; 524 525 if (_pidfile.empty()) 526 return; 527 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid); 528 if (pfh == NULL) { 529 if (errno == EEXIST) 530 errx(1, "devd already running, pid: %d", (int)otherpid); 531 warn("cannot open pid file"); 532 } 533 } 534 535 void 536 config::write_pidfile() 537 { 538 539 pidfile_write(pfh); 540 } 541 542 void 543 config::close_pidfile() 544 { 545 546 pidfile_close(pfh); 547 } 548 549 void 550 config::remove_pidfile() 551 { 552 553 pidfile_remove(pfh); 554 } 555 556 void 557 config::add_attach(int prio, event_proc *p) 558 { 559 p->set_priority(prio); 560 _attach_list.push_back(p); 561 } 562 563 void 564 config::add_detach(int prio, event_proc *p) 565 { 566 p->set_priority(prio); 567 _detach_list.push_back(p); 568 } 569 570 void 571 config::add_directory(const char *dir) 572 { 573 _dir_list.push_back(string(dir)); 574 } 575 576 void 577 config::add_nomatch(int prio, event_proc *p) 578 { 579 p->set_priority(prio); 580 _nomatch_list.push_back(p); 581 } 582 583 void 584 config::add_notify(int prio, event_proc *p) 585 { 586 p->set_priority(prio); 587 _notify_list.push_back(p); 588 } 589 590 void 591 config::set_pidfile(const char *fn) 592 { 593 _pidfile = fn; 594 } 595 596 void 597 config::push_var_table() 598 { 599 var_list *vl; 600 601 vl = new var_list(); 602 _var_list_table.push_back(vl); 603 devdlog(LOG_DEBUG, "Pushing table\n"); 604 } 605 606 void 607 config::pop_var_table() 608 { 609 delete _var_list_table.back(); 610 _var_list_table.pop_back(); 611 devdlog(LOG_DEBUG, "Popping table\n"); 612 } 613 614 void 615 config::set_variable(const char *var, const char *val) 616 { 617 _var_list_table.back()->set_variable(var, val); 618 } 619 620 const string & 621 config::get_variable(const string &var) 622 { 623 vector<var_list *>::reverse_iterator i; 624 625 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) { 626 if ((*i)->is_set(var)) 627 return ((*i)->get_variable(var)); 628 } 629 return (var_list::nothing); 630 } 631 632 bool 633 config::is_id_char(char ch) const 634 { 635 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' || 636 ch == '-')); 637 } 638 639 string 640 config::shell_quote(const string &s) 641 { 642 string buffer; 643 const char *cs, *ce; 644 char c; 645 646 /* 647 * Enclose the string in $' ' with escapes for ' and / characters making 648 * it one argument and ensuring the shell won't be affected by its 649 * usual list of candidates. 650 */ 651 buffer.reserve(s.length() * 3 / 2); 652 buffer += '$'; 653 buffer += '\''; 654 cs = s.c_str(); 655 ce = cs + strlen(cs); 656 for (; cs < ce; cs++) { 657 c = *cs; 658 if (c == '\'' || c == '\\') { 659 buffer += '\\'; 660 } 661 buffer += c; 662 } 663 buffer += '\''; 664 665 return buffer; 666 } 667 668 void 669 config::expand_one(const char *&src, string &dst, bool is_shell) 670 { 671 int count; 672 string buffer; 673 674 src++; 675 // $$ -> $ 676 if (*src == '$') { 677 dst += *src++; 678 return; 679 } 680 681 // $(foo) -> $(foo) 682 // This is the escape hatch for passing down shell subcommands 683 if (*src == '(') { 684 dst += '$'; 685 count = 1; 686 /* If the string ends before ) is matched , return. */ 687 while (count > 0 && *src) { 688 if (*src == ')') 689 count--; 690 else if (*src == '(') 691 count++; 692 dst += *src++; 693 } 694 return; 695 } 696 697 // $[^-A-Za-z_*] -> $\1 698 if (!isalpha(*src) && *src != '_' && *src != '-' && *src != '*') { 699 dst += '$'; 700 dst += *src++; 701 return; 702 } 703 704 // $var -> replace with value 705 do { 706 buffer += *src++; 707 } while (is_id_char(*src)); 708 dst.append(is_shell ? shell_quote(get_variable(buffer)) : get_variable(buffer)); 709 } 710 711 const string 712 config::expand_string(const char *src, const char *prepend, const char *append) 713 { 714 const char *var_at; 715 string dst; 716 717 /* 718 * 128 bytes is enough for 2427 of 2438 expansions that happen 719 * while parsing config files, as tested on 2013-01-30. 720 */ 721 dst.reserve(128); 722 723 if (prepend != NULL) 724 dst = prepend; 725 726 for (;;) { 727 var_at = strchr(src, '$'); 728 if (var_at == NULL) { 729 dst.append(src); 730 break; 731 } 732 dst.append(src, var_at - src); 733 src = var_at; 734 expand_one(src, dst, prepend == NULL); 735 } 736 737 if (append != NULL) 738 dst.append(append); 739 740 return (dst); 741 } 742 743 bool 744 config::chop_var(char *&buffer, char *&lhs, char *&rhs) const 745 { 746 char *walker; 747 748 if (*buffer == '\0') 749 return (false); 750 walker = lhs = buffer; 751 while (is_id_char(*walker)) 752 walker++; 753 if (*walker != '=') 754 return (false); 755 walker++; // skip = 756 if (*walker == '"') { 757 walker++; // skip " 758 rhs = walker; 759 while (*walker && *walker != '"') { 760 // Skip \" ... We leave it in the string and strip the \ later. 761 // due to the super simplistic parser that we have here. 762 if (*walker == '\\' && walker[1] == '"') 763 walker++; 764 walker++; 765 } 766 if (*walker != '"') 767 return (false); 768 rhs[-2] = '\0'; 769 *walker++ = '\0'; 770 } else { 771 rhs = walker; 772 while (*walker && !isspace(*walker)) 773 walker++; 774 if (*walker != '\0') 775 *walker++ = '\0'; 776 rhs[-1] = '\0'; 777 } 778 while (isspace(*walker)) 779 walker++; 780 buffer = walker; 781 return (true); 782 } 783 784 785 char * 786 config::set_vars(char *buffer) 787 { 788 char *lhs; 789 char *rhs; 790 791 while (1) { 792 if (!chop_var(buffer, lhs, rhs)) 793 break; 794 set_variable(lhs, rhs); 795 } 796 return (buffer); 797 } 798 799 void 800 config::find_and_execute(char type) 801 { 802 vector<event_proc *> *l; 803 vector<event_proc *>::const_iterator i; 804 const char *s; 805 806 switch (type) { 807 default: 808 return; 809 case notify: 810 l = &_notify_list; 811 s = "notify"; 812 break; 813 case nomatch: 814 l = &_nomatch_list; 815 s = "nomatch"; 816 break; 817 case attach: 818 l = &_attach_list; 819 s = "attach"; 820 break; 821 case detach: 822 l = &_detach_list; 823 s = "detach"; 824 break; 825 } 826 devdlog(LOG_DEBUG, "Processing %s event\n", s); 827 for (i = l->begin(); i != l->end(); ++i) { 828 if ((*i)->matches(*this)) { 829 (*i)->run(*this); 830 break; 831 } 832 } 833 834 } 835 836 837 static void 838 process_event(char *buffer) 839 { 840 char type; 841 char *sp; 842 struct timeval tv; 843 char *timestr; 844 845 sp = buffer + 1; 846 devdlog(LOG_INFO, "Processing event '%s'\n", buffer); 847 type = *buffer++; 848 cfg.push_var_table(); 849 // $* is the entire line 850 cfg.set_variable("*", buffer - 1); 851 // $_ is the entire line without the initial character 852 cfg.set_variable("_", buffer); 853 854 // Save the time this happened (as approximated by when we got 855 // around to processing it). 856 gettimeofday(&tv, NULL); 857 asprintf(×tr, "%jd.%06ld", (uintmax_t)tv.tv_sec, tv.tv_usec); 858 cfg.set_variable("timestamp", timestr); 859 free(timestr); 860 861 // Match doesn't have a device, and the format is a little 862 // different, so handle it separately. 863 switch (type) { 864 case notify: 865 //! (k=v)* 866 sp = cfg.set_vars(sp); 867 break; 868 case nomatch: 869 //? at location pnp-info on bus 870 sp = strchr(sp, ' '); 871 if (sp == NULL) 872 return; /* Can't happen? */ 873 *sp++ = '\0'; 874 while (isspace(*sp)) 875 sp++; 876 if (strncmp(sp, "at ", 3) == 0) 877 sp += 3; 878 sp = cfg.set_vars(sp); 879 while (isspace(*sp)) 880 sp++; 881 if (strncmp(sp, "on ", 3) == 0) 882 cfg.set_variable("bus", sp + 3); 883 break; 884 case attach: /*FALLTHROUGH*/ 885 case detach: 886 sp = strchr(sp, ' '); 887 if (sp == NULL) 888 return; /* Can't happen? */ 889 *sp++ = '\0'; 890 cfg.set_variable("device-name", buffer); 891 while (isspace(*sp)) 892 sp++; 893 if (strncmp(sp, "at ", 3) == 0) 894 sp += 3; 895 sp = cfg.set_vars(sp); 896 while (isspace(*sp)) 897 sp++; 898 if (strncmp(sp, "on ", 3) == 0) 899 cfg.set_variable("bus", sp + 3); 900 break; 901 } 902 903 cfg.find_and_execute(type); 904 cfg.pop_var_table(); 905 } 906 907 static int 908 create_socket(const char *name, int socktype) 909 { 910 int fd, slen; 911 struct sockaddr_un sun; 912 913 if ((fd = socket(PF_LOCAL, socktype, 0)) < 0) 914 err(1, "socket"); 915 bzero(&sun, sizeof(sun)); 916 sun.sun_family = AF_UNIX; 917 strlcpy(sun.sun_path, name, sizeof(sun.sun_path)); 918 slen = SUN_LEN(&sun); 919 unlink(name); 920 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 921 err(1, "fcntl"); 922 if (::bind(fd, (struct sockaddr *) & sun, slen) < 0) 923 err(1, "bind"); 924 listen(fd, 4); 925 if (chown(name, 0, 0)) /* XXX - root.wheel */ 926 err(1, "chown"); 927 if (chmod(name, 0666)) 928 err(1, "chmod"); 929 return (fd); 930 } 931 932 static unsigned int max_clients = 10; /* Default, can be overridden on cmdline. */ 933 static unsigned int num_clients; 934 935 static list<client_t> clients; 936 937 static void 938 notify_clients(const char *data, int len) 939 { 940 list<client_t>::iterator i; 941 942 /* 943 * Deliver the data to all clients. Throw clients overboard at the 944 * first sign of trouble. This reaps clients who've died or closed 945 * their sockets, and also clients who are alive but failing to keep up 946 * (or who are maliciously not reading, to consume buffer space in 947 * kernel memory or tie up the limited number of available connections). 948 */ 949 for (i = clients.begin(); i != clients.end(); ) { 950 int flags; 951 if (i->socktype == SOCK_SEQPACKET) 952 flags = MSG_EOR; 953 else 954 flags = 0; 955 956 if (send(i->fd, data, len, flags) != len) { 957 --num_clients; 958 close(i->fd); 959 i = clients.erase(i); 960 devdlog(LOG_WARNING, "notify_clients: send() failed; " 961 "dropping unresponsive client\n"); 962 } else 963 ++i; 964 } 965 } 966 967 static void 968 check_clients(void) 969 { 970 int s; 971 struct pollfd pfd; 972 list<client_t>::iterator i; 973 974 /* 975 * Check all existing clients to see if any of them have disappeared. 976 * Normally we reap clients when we get an error trying to send them an 977 * event. This check eliminates the problem of an ever-growing list of 978 * zombie clients because we're never writing to them on a system 979 * without frequent device-change activity. 980 */ 981 pfd.events = 0; 982 for (i = clients.begin(); i != clients.end(); ) { 983 pfd.fd = i->fd; 984 s = poll(&pfd, 1, 0); 985 if ((s < 0 && s != EINTR ) || 986 (s > 0 && (pfd.revents & POLLHUP))) { 987 --num_clients; 988 close(i->fd); 989 i = clients.erase(i); 990 devdlog(LOG_NOTICE, "check_clients: " 991 "dropping disconnected client\n"); 992 } else 993 ++i; 994 } 995 } 996 997 static void 998 new_client(int fd, int socktype) 999 { 1000 client_t s; 1001 int sndbuf_size; 1002 1003 /* 1004 * First go reap any zombie clients, then accept the connection, and 1005 * shut down the read side to stop clients from consuming kernel memory 1006 * by sending large buffers full of data we'll never read. 1007 */ 1008 check_clients(); 1009 s.socktype = socktype; 1010 s.fd = accept(fd, NULL, NULL); 1011 if (s.fd != -1) { 1012 sndbuf_size = CLIENT_BUFSIZE; 1013 if (setsockopt(s.fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, 1014 sizeof(sndbuf_size))) 1015 err(1, "setsockopt"); 1016 shutdown(s.fd, SHUT_RD); 1017 clients.push_back(s); 1018 ++num_clients; 1019 } else 1020 err(1, "accept"); 1021 } 1022 1023 static void 1024 event_loop(void) 1025 { 1026 int rv; 1027 int fd; 1028 char buffer[DEVCTL_MAXBUF]; 1029 int once = 0; 1030 int stream_fd, seqpacket_fd, max_fd; 1031 int accepting; 1032 timeval tv; 1033 fd_set fds; 1034 1035 fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC); 1036 if (fd == -1) 1037 err(1, "Can't open devctl device %s", PATH_DEVCTL); 1038 stream_fd = create_socket(STREAMPIPE, SOCK_STREAM); 1039 seqpacket_fd = create_socket(SEQPACKETPIPE, SOCK_SEQPACKET); 1040 accepting = 1; 1041 max_fd = max(fd, max(stream_fd, seqpacket_fd)) + 1; 1042 while (!romeo_must_die) { 1043 if (!once && !no_daemon && !daemonize_quick) { 1044 // Check to see if we have any events pending. 1045 tv.tv_sec = 0; 1046 tv.tv_usec = 0; 1047 FD_ZERO(&fds); 1048 FD_SET(fd, &fds); 1049 rv = select(fd + 1, &fds, NULL, NULL, &tv); 1050 // No events -> we've processed all pending events 1051 if (rv == 0) { 1052 devdlog(LOG_DEBUG, "Calling daemon\n"); 1053 cfg.remove_pidfile(); 1054 cfg.open_pidfile(); 1055 daemon(0, 0); 1056 cfg.write_pidfile(); 1057 once++; 1058 } 1059 } 1060 /* 1061 * When we've already got the max number of clients, stop 1062 * accepting new connections (don't put the listening sockets in 1063 * the set), shrink the accept() queue to reject connections 1064 * quickly, and poll the existing clients more often, so that we 1065 * notice more quickly when any of them disappear to free up 1066 * client slots. 1067 */ 1068 FD_ZERO(&fds); 1069 FD_SET(fd, &fds); 1070 if (num_clients < max_clients) { 1071 if (!accepting) { 1072 listen(stream_fd, max_clients); 1073 listen(seqpacket_fd, max_clients); 1074 accepting = 1; 1075 } 1076 FD_SET(stream_fd, &fds); 1077 FD_SET(seqpacket_fd, &fds); 1078 tv.tv_sec = 60; 1079 tv.tv_usec = 0; 1080 } else { 1081 if (accepting) { 1082 listen(stream_fd, 0); 1083 listen(seqpacket_fd, 0); 1084 accepting = 0; 1085 } 1086 tv.tv_sec = 2; 1087 tv.tv_usec = 0; 1088 } 1089 rv = select(max_fd, &fds, NULL, NULL, &tv); 1090 if (got_siginfo) { 1091 devdlog(LOG_NOTICE, "Events received so far=%u\n", 1092 total_events); 1093 got_siginfo = 0; 1094 } 1095 if (rv == -1) { 1096 if (errno == EINTR) 1097 continue; 1098 err(1, "select"); 1099 } else if (rv == 0) 1100 check_clients(); 1101 if (FD_ISSET(fd, &fds)) { 1102 rv = read(fd, buffer, sizeof(buffer) - 1); 1103 if (rv > 0) { 1104 total_events++; 1105 if (rv == sizeof(buffer) - 1) { 1106 devdlog(LOG_WARNING, "Warning: " 1107 "available event data exceeded " 1108 "buffer space\n"); 1109 } 1110 notify_clients(buffer, rv); 1111 buffer[rv] = '\0'; 1112 while (buffer[--rv] == '\n') 1113 buffer[rv] = '\0'; 1114 try { 1115 process_event(buffer); 1116 } 1117 catch (const std::length_error& e) { 1118 devdlog(LOG_ERR, "Dropping event %s " 1119 "due to low memory", buffer); 1120 } 1121 } else if (rv < 0) { 1122 if (errno != EINTR) 1123 break; 1124 } else { 1125 /* EOF */ 1126 break; 1127 } 1128 } 1129 if (FD_ISSET(stream_fd, &fds)) 1130 new_client(stream_fd, SOCK_STREAM); 1131 /* 1132 * Aside from the socket type, both sockets use the same 1133 * protocol, so we can process clients the same way. 1134 */ 1135 if (FD_ISSET(seqpacket_fd, &fds)) 1136 new_client(seqpacket_fd, SOCK_SEQPACKET); 1137 } 1138 cfg.remove_pidfile(); 1139 close(seqpacket_fd); 1140 close(stream_fd); 1141 close(fd); 1142 } 1143 1144 /* 1145 * functions that the parser uses. 1146 */ 1147 void 1148 add_attach(int prio, event_proc *p) 1149 { 1150 cfg.add_attach(prio, p); 1151 } 1152 1153 void 1154 add_detach(int prio, event_proc *p) 1155 { 1156 cfg.add_detach(prio, p); 1157 } 1158 1159 void 1160 add_directory(const char *dir) 1161 { 1162 cfg.add_directory(dir); 1163 free(const_cast<char *>(dir)); 1164 } 1165 1166 void 1167 add_nomatch(int prio, event_proc *p) 1168 { 1169 cfg.add_nomatch(prio, p); 1170 } 1171 1172 void 1173 add_notify(int prio, event_proc *p) 1174 { 1175 cfg.add_notify(prio, p); 1176 } 1177 1178 event_proc * 1179 add_to_event_proc(event_proc *ep, eps *eps) 1180 { 1181 if (ep == NULL) 1182 ep = new event_proc(); 1183 ep->add(eps); 1184 return (ep); 1185 } 1186 1187 eps * 1188 new_action(const char *cmd) 1189 { 1190 eps *e = new action(cmd); 1191 free(const_cast<char *>(cmd)); 1192 return (e); 1193 } 1194 1195 eps * 1196 new_match(const char *var, const char *re) 1197 { 1198 eps *e = new match(cfg, var, re); 1199 free(const_cast<char *>(var)); 1200 free(const_cast<char *>(re)); 1201 return (e); 1202 } 1203 1204 eps * 1205 new_media(const char *var, const char *re) 1206 { 1207 eps *e = new media(cfg, var, re); 1208 free(const_cast<char *>(var)); 1209 free(const_cast<char *>(re)); 1210 return (e); 1211 } 1212 1213 void 1214 set_pidfile(const char *name) 1215 { 1216 cfg.set_pidfile(name); 1217 free(const_cast<char *>(name)); 1218 } 1219 1220 void 1221 set_variable(const char *var, const char *val) 1222 { 1223 cfg.set_variable(var, val); 1224 free(const_cast<char *>(var)); 1225 free(const_cast<char *>(val)); 1226 } 1227 1228 1229 1230 static void 1231 gensighand(int) 1232 { 1233 romeo_must_die = 1; 1234 } 1235 1236 /* 1237 * SIGINFO handler. Will print useful statistics to the syslog or stderr 1238 * as appropriate 1239 */ 1240 static void 1241 siginfohand(int) 1242 { 1243 got_siginfo = 1; 1244 } 1245 1246 /* 1247 * Local logging function. Prints to syslog if we're daemonized; stderr 1248 * otherwise. 1249 */ 1250 static void 1251 devdlog(int priority, const char* fmt, ...) 1252 { 1253 va_list argp; 1254 1255 va_start(argp, fmt); 1256 if (no_daemon) 1257 vfprintf(stderr, fmt, argp); 1258 else if (quiet_mode == 0 || priority <= LOG_WARNING) 1259 vsyslog(priority, fmt, argp); 1260 va_end(argp); 1261 } 1262 1263 static void 1264 usage() 1265 { 1266 fprintf(stderr, "usage: %s [-dnq] [-l connlimit] [-f file]\n", 1267 getprogname()); 1268 exit(1); 1269 } 1270 1271 static void 1272 check_devd_enabled() 1273 { 1274 int val = 0; 1275 size_t len; 1276 1277 len = sizeof(val); 1278 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0) 1279 errx(1, "devctl sysctl missing from kernel!"); 1280 if (val == 0) { 1281 warnx("Setting " SYSCTL " to 1000"); 1282 val = 1000; 1283 if (sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val))) 1284 err(1, "sysctlbyname"); 1285 } 1286 } 1287 1288 /* 1289 * main 1290 */ 1291 int 1292 main(int argc, char **argv) 1293 { 1294 int ch; 1295 1296 check_devd_enabled(); 1297 while ((ch = getopt(argc, argv, "df:l:nq")) != -1) { 1298 switch (ch) { 1299 case 'd': 1300 no_daemon = 1; 1301 break; 1302 case 'f': 1303 configfile = optarg; 1304 break; 1305 case 'l': 1306 max_clients = MAX(1, strtoul(optarg, NULL, 0)); 1307 break; 1308 case 'n': 1309 daemonize_quick = 1; 1310 break; 1311 case 'q': 1312 quiet_mode = 1; 1313 break; 1314 default: 1315 usage(); 1316 } 1317 } 1318 1319 cfg.parse(); 1320 if (!no_daemon && daemonize_quick) { 1321 cfg.open_pidfile(); 1322 daemon(0, 0); 1323 cfg.write_pidfile(); 1324 } 1325 signal(SIGPIPE, SIG_IGN); 1326 signal(SIGHUP, gensighand); 1327 signal(SIGINT, gensighand); 1328 signal(SIGTERM, gensighand); 1329 signal(SIGINFO, siginfohand); 1330 event_loop(); 1331 return (0); 1332 } 1333