devd.cc revision 314425
1/*- 2 * Copyright (c) 2002-2010 M. Warner Losh. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * my_system is a variation on lib/libc/stdlib/system.c: 27 * 28 * Copyright (c) 1988, 1993 29 * The Regents of the University of California. All rights reserved. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56/* 57 * DEVD control daemon. 58 */ 59 60// TODO list: 61// o devd.conf and devd man pages need a lot of help: 62// - devd needs to document the unix domain socket 63// - devd.conf needs more details on the supported statements. 64 65#include <sys/cdefs.h> 66__FBSDID("$FreeBSD: stable/10/sbin/devd/devd.cc 314425 2017-02-28 22:18:05Z asomers $"); 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 133using namespace std; 134 135typedef struct client { 136 int fd; 137 int socktype; 138} client_t; 139 140extern FILE *yyin; 141extern int lineno; 142 143static const char notify = '!'; 144static const char nomatch = '?'; 145static const char attach = '+'; 146static const char detach = '-'; 147 148static struct pidfh *pfh; 149 150static int no_daemon = 0; 151static int daemonize_quick = 0; 152static int quiet_mode = 0; 153static unsigned total_events = 0; 154static volatile sig_atomic_t got_siginfo = 0; 155static volatile sig_atomic_t romeo_must_die = 0; 156 157static const char *configfile = CF; 158 159static void devdlog(int priority, const char* message, ...) 160 __printflike(2, 3); 161static void event_loop(void); 162static void usage(void); 163 164template <class T> void 165delete_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 174config cfg; 175 176event_proc::event_proc() : _prio(-1) 177{ 178 _epsvec.reserve(4); 179} 180 181event_proc::~event_proc() 182{ 183 delete_and_clear(_epsvec); 184} 185 186void 187event_proc::add(eps *eps) 188{ 189 _epsvec.push_back(eps); 190} 191 192bool 193event_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 203bool 204event_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 214action::action(const char *cmd) 215 : _cmd(cmd) 216{ 217 // nothing 218} 219 220action::~action() 221{ 222 // nothing 223} 224 225static int 226my_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 279bool 280action::do_action(config &c) 281{ 282 string s = c.expand_string(_cmd.c_str()); 283 devdlog(LOG_NOTICE, "Executing '%s'\n", s.c_str()); 284 my_system(s.c_str()); 285 return (true); 286} 287 288match::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 296match::~match() 297{ 298 regfree(&_regex); 299} 300 301bool 302match::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 329media::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 348media::~media() 349{ 350} 351 352bool 353media::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 394const string var_list::bogus = "_$_$_$_$_B_O_G_U_S_$_$_$_$_"; 395const string var_list::nothing = ""; 396 397const string & 398var_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 408bool 409var_list::is_set(const string &var) const 410{ 411 return (_vars.find(var) != _vars.end()); 412} 413 414void 415var_list::set_variable(const string &var, const string &val) 416{ 417 /* 418 * This function gets called WAY too often to justify calling syslog() 419 * each time, even at LOG_DEBUG. Because if syslogd isn't running, it 420 * can consume excessive amounts of systime inside of connect(). Only 421 * log when we're in -d mode. 422 */ 423 if (no_daemon) 424 devdlog(LOG_DEBUG, "setting %s=%s\n", var.c_str(), val.c_str()); 425 _vars[var] = val; 426} 427 428void 429config::reset(void) 430{ 431 _dir_list.clear(); 432 delete_and_clear(_var_list_table); 433 delete_and_clear(_attach_list); 434 delete_and_clear(_detach_list); 435 delete_and_clear(_nomatch_list); 436 delete_and_clear(_notify_list); 437} 438 439void 440config::parse_one_file(const char *fn) 441{ 442 devdlog(LOG_DEBUG, "Parsing %s\n", fn); 443 yyin = fopen(fn, "r"); 444 if (yyin == NULL) 445 err(1, "Cannot open config file %s", fn); 446 lineno = 1; 447 if (yyparse() != 0) 448 errx(1, "Cannot parse %s at line %d", fn, lineno); 449 fclose(yyin); 450} 451 452void 453config::parse_files_in_dir(const char *dirname) 454{ 455 DIR *dirp; 456 struct dirent *dp; 457 char path[PATH_MAX]; 458 459 devdlog(LOG_DEBUG, "Parsing files in %s\n", dirname); 460 dirp = opendir(dirname); 461 if (dirp == NULL) 462 return; 463 readdir(dirp); /* Skip . */ 464 readdir(dirp); /* Skip .. */ 465 while ((dp = readdir(dirp)) != NULL) { 466 if (strcmp(dp->d_name + dp->d_namlen - 5, ".conf") == 0) { 467 snprintf(path, sizeof(path), "%s/%s", 468 dirname, dp->d_name); 469 parse_one_file(path); 470 } 471 } 472 closedir(dirp); 473} 474 475class epv_greater { 476public: 477 int operator()(event_proc *const&l1, event_proc *const&l2) const 478 { 479 return (l1->get_priority() > l2->get_priority()); 480 } 481}; 482 483void 484config::sort_vector(vector<event_proc *> &v) 485{ 486 stable_sort(v.begin(), v.end(), epv_greater()); 487} 488 489void 490config::parse(void) 491{ 492 vector<string>::const_iterator i; 493 494 parse_one_file(configfile); 495 for (i = _dir_list.begin(); i != _dir_list.end(); ++i) 496 parse_files_in_dir((*i).c_str()); 497 sort_vector(_attach_list); 498 sort_vector(_detach_list); 499 sort_vector(_nomatch_list); 500 sort_vector(_notify_list); 501} 502 503void 504config::open_pidfile() 505{ 506 pid_t otherpid; 507 508 if (_pidfile.empty()) 509 return; 510 pfh = pidfile_open(_pidfile.c_str(), 0600, &otherpid); 511 if (pfh == NULL) { 512 if (errno == EEXIST) 513 errx(1, "devd already running, pid: %d", (int)otherpid); 514 warn("cannot open pid file"); 515 } 516} 517 518void 519config::write_pidfile() 520{ 521 522 pidfile_write(pfh); 523} 524 525void 526config::close_pidfile() 527{ 528 529 pidfile_close(pfh); 530} 531 532void 533config::remove_pidfile() 534{ 535 536 pidfile_remove(pfh); 537} 538 539void 540config::add_attach(int prio, event_proc *p) 541{ 542 p->set_priority(prio); 543 _attach_list.push_back(p); 544} 545 546void 547config::add_detach(int prio, event_proc *p) 548{ 549 p->set_priority(prio); 550 _detach_list.push_back(p); 551} 552 553void 554config::add_directory(const char *dir) 555{ 556 _dir_list.push_back(string(dir)); 557} 558 559void 560config::add_nomatch(int prio, event_proc *p) 561{ 562 p->set_priority(prio); 563 _nomatch_list.push_back(p); 564} 565 566void 567config::add_notify(int prio, event_proc *p) 568{ 569 p->set_priority(prio); 570 _notify_list.push_back(p); 571} 572 573void 574config::set_pidfile(const char *fn) 575{ 576 _pidfile = fn; 577} 578 579void 580config::push_var_table() 581{ 582 var_list *vl; 583 584 vl = new var_list(); 585 _var_list_table.push_back(vl); 586 devdlog(LOG_DEBUG, "Pushing table\n"); 587} 588 589void 590config::pop_var_table() 591{ 592 delete _var_list_table.back(); 593 _var_list_table.pop_back(); 594 devdlog(LOG_DEBUG, "Popping table\n"); 595} 596 597void 598config::set_variable(const char *var, const char *val) 599{ 600 _var_list_table.back()->set_variable(var, val); 601} 602 603const string & 604config::get_variable(const string &var) 605{ 606 vector<var_list *>::reverse_iterator i; 607 608 for (i = _var_list_table.rbegin(); i != _var_list_table.rend(); ++i) { 609 if ((*i)->is_set(var)) 610 return ((*i)->get_variable(var)); 611 } 612 return (var_list::nothing); 613} 614 615bool 616config::is_id_char(char ch) const 617{ 618 return (ch != '\0' && (isalpha(ch) || isdigit(ch) || ch == '_' || 619 ch == '-')); 620} 621 622void 623config::expand_one(const char *&src, string &dst) 624{ 625 int count; 626 string buffer; 627 628 src++; 629 // $$ -> $ 630 if (*src == '$') { 631 dst += *src++; 632 return; 633 } 634 635 // $(foo) -> $(foo) 636 // Not sure if I want to support this or not, so for now we just pass 637 // it through. 638 if (*src == '(') { 639 dst += '$'; 640 count = 1; 641 /* If the string ends before ) is matched , return. */ 642 while (count > 0 && *src) { 643 if (*src == ')') 644 count--; 645 else if (*src == '(') 646 count++; 647 dst += *src++; 648 } 649 return; 650 } 651 652 // $[^A-Za-z] -> $\1 653 if (!isalpha(*src)) { 654 dst += '$'; 655 dst += *src++; 656 return; 657 } 658 659 // $var -> replace with value 660 do { 661 buffer += *src++; 662 } while (is_id_char(*src)); 663 dst.append(get_variable(buffer)); 664} 665 666const string 667config::expand_string(const char *src, const char *prepend, const char *append) 668{ 669 const char *var_at; 670 string dst; 671 672 /* 673 * 128 bytes is enough for 2427 of 2438 expansions that happen 674 * while parsing config files, as tested on 2013-01-30. 675 */ 676 dst.reserve(128); 677 678 if (prepend != NULL) 679 dst = prepend; 680 681 for (;;) { 682 var_at = strchr(src, '$'); 683 if (var_at == NULL) { 684 dst.append(src); 685 break; 686 } 687 dst.append(src, var_at - src); 688 src = var_at; 689 expand_one(src, dst); 690 } 691 692 if (append != NULL) 693 dst.append(append); 694 695 return (dst); 696} 697 698bool 699config::chop_var(char *&buffer, char *&lhs, char *&rhs) const 700{ 701 char *walker; 702 703 if (*buffer == '\0') 704 return (false); 705 walker = lhs = buffer; 706 while (is_id_char(*walker)) 707 walker++; 708 if (*walker != '=') 709 return (false); 710 walker++; // skip = 711 if (*walker == '"') { 712 walker++; // skip " 713 rhs = walker; 714 while (*walker && *walker != '"') 715 walker++; 716 if (*walker != '"') 717 return (false); 718 rhs[-2] = '\0'; 719 *walker++ = '\0'; 720 } else { 721 rhs = walker; 722 while (*walker && !isspace(*walker)) 723 walker++; 724 if (*walker != '\0') 725 *walker++ = '\0'; 726 rhs[-1] = '\0'; 727 } 728 while (isspace(*walker)) 729 walker++; 730 buffer = walker; 731 return (true); 732} 733 734 735char * 736config::set_vars(char *buffer) 737{ 738 char *lhs; 739 char *rhs; 740 741 while (1) { 742 if (!chop_var(buffer, lhs, rhs)) 743 break; 744 set_variable(lhs, rhs); 745 } 746 return (buffer); 747} 748 749void 750config::find_and_execute(char type) 751{ 752 vector<event_proc *> *l; 753 vector<event_proc *>::const_iterator i; 754 const char *s; 755 756 switch (type) { 757 default: 758 return; 759 case notify: 760 l = &_notify_list; 761 s = "notify"; 762 break; 763 case nomatch: 764 l = &_nomatch_list; 765 s = "nomatch"; 766 break; 767 case attach: 768 l = &_attach_list; 769 s = "attach"; 770 break; 771 case detach: 772 l = &_detach_list; 773 s = "detach"; 774 break; 775 } 776 devdlog(LOG_DEBUG, "Processing %s event\n", s); 777 for (i = l->begin(); i != l->end(); ++i) { 778 if ((*i)->matches(*this)) { 779 (*i)->run(*this); 780 break; 781 } 782 } 783 784} 785 786 787static void 788process_event(char *buffer) 789{ 790 char type; 791 char *sp; 792 793 sp = buffer + 1; 794 devdlog(LOG_INFO, "Processing event '%s'\n", buffer); 795 type = *buffer++; 796 cfg.push_var_table(); 797 // No match doesn't have a device, and the format is a little 798 // different, so handle it separately. 799 switch (type) { 800 case notify: 801 sp = cfg.set_vars(sp); 802 break; 803 case nomatch: 804 //? at location pnp-info on bus 805 sp = strchr(sp, ' '); 806 if (sp == NULL) 807 return; /* Can't happen? */ 808 *sp++ = '\0'; 809 while (isspace(*sp)) 810 sp++; 811 if (strncmp(sp, "at ", 3) == 0) 812 sp += 3; 813 sp = cfg.set_vars(sp); 814 while (isspace(*sp)) 815 sp++; 816 if (strncmp(sp, "on ", 3) == 0) 817 cfg.set_variable("bus", sp + 3); 818 break; 819 case attach: /*FALLTHROUGH*/ 820 case detach: 821 sp = strchr(sp, ' '); 822 if (sp == NULL) 823 return; /* Can't happen? */ 824 *sp++ = '\0'; 825 cfg.set_variable("device-name", buffer); 826 while (isspace(*sp)) 827 sp++; 828 if (strncmp(sp, "at ", 3) == 0) 829 sp += 3; 830 sp = cfg.set_vars(sp); 831 while (isspace(*sp)) 832 sp++; 833 if (strncmp(sp, "on ", 3) == 0) 834 cfg.set_variable("bus", sp + 3); 835 break; 836 } 837 838 cfg.find_and_execute(type); 839 cfg.pop_var_table(); 840} 841 842int 843create_socket(const char *name, int socktype) 844{ 845 int fd, slen; 846 struct sockaddr_un sun; 847 848 if ((fd = socket(PF_LOCAL, socktype, 0)) < 0) 849 err(1, "socket"); 850 bzero(&sun, sizeof(sun)); 851 sun.sun_family = AF_UNIX; 852 strlcpy(sun.sun_path, name, sizeof(sun.sun_path)); 853 slen = SUN_LEN(&sun); 854 unlink(name); 855 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 856 err(1, "fcntl"); 857 if (::bind(fd, (struct sockaddr *) & sun, slen) < 0) 858 err(1, "bind"); 859 listen(fd, 4); 860 if (chown(name, 0, 0)) /* XXX - root.wheel */ 861 err(1, "chown"); 862 if (chmod(name, 0666)) 863 err(1, "chmod"); 864 return (fd); 865} 866 867unsigned int max_clients = 10; /* Default, can be overridden on cmdline. */ 868unsigned int num_clients; 869 870list<client_t> clients; 871 872void 873notify_clients(const char *data, int len) 874{ 875 list<client_t>::iterator i; 876 877 /* 878 * Deliver the data to all clients. Throw clients overboard at the 879 * first sign of trouble. This reaps clients who've died or closed 880 * their sockets, and also clients who are alive but failing to keep up 881 * (or who are maliciously not reading, to consume buffer space in 882 * kernel memory or tie up the limited number of available connections). 883 */ 884 for (i = clients.begin(); i != clients.end(); ) { 885 int flags; 886 if (i->socktype == SOCK_SEQPACKET) 887 flags = MSG_EOR; 888 else 889 flags = 0; 890 891 if (send(i->fd, data, len, flags) != len) { 892 --num_clients; 893 close(i->fd); 894 i = clients.erase(i); 895 devdlog(LOG_WARNING, "notify_clients: send() failed; " 896 "dropping unresponsive client\n"); 897 } else 898 ++i; 899 } 900} 901 902void 903check_clients(void) 904{ 905 int s; 906 struct pollfd pfd; 907 list<client_t>::iterator i; 908 909 /* 910 * Check all existing clients to see if any of them have disappeared. 911 * Normally we reap clients when we get an error trying to send them an 912 * event. This check eliminates the problem of an ever-growing list of 913 * zombie clients because we're never writing to them on a system 914 * without frequent device-change activity. 915 */ 916 pfd.events = 0; 917 for (i = clients.begin(); i != clients.end(); ) { 918 pfd.fd = i->fd; 919 s = poll(&pfd, 1, 0); 920 if ((s < 0 && s != EINTR ) || 921 (s > 0 && (pfd.revents & POLLHUP))) { 922 --num_clients; 923 close(i->fd); 924 i = clients.erase(i); 925 devdlog(LOG_NOTICE, "check_clients: " 926 "dropping disconnected client\n"); 927 } else 928 ++i; 929 } 930} 931 932void 933new_client(int fd, int socktype) 934{ 935 client_t s; 936 int sndbuf_size; 937 938 /* 939 * First go reap any zombie clients, then accept the connection, and 940 * shut down the read side to stop clients from consuming kernel memory 941 * by sending large buffers full of data we'll never read. 942 */ 943 check_clients(); 944 s.socktype = socktype; 945 s.fd = accept(fd, NULL, NULL); 946 if (s.fd != -1) { 947 sndbuf_size = CLIENT_BUFSIZE; 948 if (setsockopt(s.fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, 949 sizeof(sndbuf_size))) 950 err(1, "setsockopt"); 951 shutdown(s.fd, SHUT_RD); 952 clients.push_back(s); 953 ++num_clients; 954 } else 955 err(1, "accept"); 956} 957 958static void 959event_loop(void) 960{ 961 int rv; 962 int fd; 963 char buffer[DEVCTL_MAXBUF]; 964 int once = 0; 965 int stream_fd, seqpacket_fd, max_fd; 966 int accepting; 967 timeval tv; 968 fd_set fds; 969 970 fd = open(PATH_DEVCTL, O_RDONLY | O_CLOEXEC); 971 if (fd == -1) 972 err(1, "Can't open devctl device %s", PATH_DEVCTL); 973 stream_fd = create_socket(STREAMPIPE, SOCK_STREAM); 974 seqpacket_fd = create_socket(SEQPACKETPIPE, SOCK_SEQPACKET); 975 accepting = 1; 976 max_fd = max(fd, max(stream_fd, seqpacket_fd)) + 1; 977 while (!romeo_must_die) { 978 if (!once && !no_daemon && !daemonize_quick) { 979 // Check to see if we have any events pending. 980 tv.tv_sec = 0; 981 tv.tv_usec = 0; 982 FD_ZERO(&fds); 983 FD_SET(fd, &fds); 984 rv = select(fd + 1, &fds, &fds, &fds, &tv); 985 // No events -> we've processed all pending events 986 if (rv == 0) { 987 devdlog(LOG_DEBUG, "Calling daemon\n"); 988 cfg.remove_pidfile(); 989 cfg.open_pidfile(); 990 daemon(0, 0); 991 cfg.write_pidfile(); 992 once++; 993 } 994 } 995 /* 996 * When we've already got the max number of clients, stop 997 * accepting new connections (don't put the listening sockets in 998 * the set), shrink the accept() queue to reject connections 999 * quickly, and poll the existing clients more often, so that we 1000 * notice more quickly when any of them disappear to free up 1001 * client slots. 1002 */ 1003 FD_ZERO(&fds); 1004 FD_SET(fd, &fds); 1005 if (num_clients < max_clients) { 1006 if (!accepting) { 1007 listen(stream_fd, max_clients); 1008 listen(seqpacket_fd, max_clients); 1009 accepting = 1; 1010 } 1011 FD_SET(stream_fd, &fds); 1012 FD_SET(seqpacket_fd, &fds); 1013 tv.tv_sec = 60; 1014 tv.tv_usec = 0; 1015 } else { 1016 if (accepting) { 1017 listen(stream_fd, 0); 1018 listen(seqpacket_fd, 0); 1019 accepting = 0; 1020 } 1021 tv.tv_sec = 2; 1022 tv.tv_usec = 0; 1023 } 1024 rv = select(max_fd, &fds, NULL, NULL, &tv); 1025 if (got_siginfo) { 1026 devdlog(LOG_NOTICE, "Events received so far=%u\n", 1027 total_events); 1028 got_siginfo = 0; 1029 } 1030 if (rv == -1) { 1031 if (errno == EINTR) 1032 continue; 1033 err(1, "select"); 1034 } else if (rv == 0) 1035 check_clients(); 1036 if (FD_ISSET(fd, &fds)) { 1037 rv = read(fd, buffer, sizeof(buffer) - 1); 1038 if (rv > 0) { 1039 total_events++; 1040 if (rv == sizeof(buffer) - 1) { 1041 devdlog(LOG_WARNING, "Warning: " 1042 "available event data exceeded " 1043 "buffer space\n"); 1044 } 1045 notify_clients(buffer, rv); 1046 buffer[rv] = '\0'; 1047 while (buffer[--rv] == '\n') 1048 buffer[rv] = '\0'; 1049 try { 1050 process_event(buffer); 1051 } 1052 catch (std::length_error e) { 1053 devdlog(LOG_ERR, "Dropping event %s " 1054 "due to low memory", buffer); 1055 } 1056 } else if (rv < 0) { 1057 if (errno != EINTR) 1058 break; 1059 } else { 1060 /* EOF */ 1061 break; 1062 } 1063 } 1064 if (FD_ISSET(stream_fd, &fds)) 1065 new_client(stream_fd, SOCK_STREAM); 1066 /* 1067 * Aside from the socket type, both sockets use the same 1068 * protocol, so we can process clients the same way. 1069 */ 1070 if (FD_ISSET(seqpacket_fd, &fds)) 1071 new_client(seqpacket_fd, SOCK_SEQPACKET); 1072 } 1073 close(seqpacket_fd); 1074 close(stream_fd); 1075 close(fd); 1076} 1077 1078/* 1079 * functions that the parser uses. 1080 */ 1081void 1082add_attach(int prio, event_proc *p) 1083{ 1084 cfg.add_attach(prio, p); 1085} 1086 1087void 1088add_detach(int prio, event_proc *p) 1089{ 1090 cfg.add_detach(prio, p); 1091} 1092 1093void 1094add_directory(const char *dir) 1095{ 1096 cfg.add_directory(dir); 1097 free(const_cast<char *>(dir)); 1098} 1099 1100void 1101add_nomatch(int prio, event_proc *p) 1102{ 1103 cfg.add_nomatch(prio, p); 1104} 1105 1106void 1107add_notify(int prio, event_proc *p) 1108{ 1109 cfg.add_notify(prio, p); 1110} 1111 1112event_proc * 1113add_to_event_proc(event_proc *ep, eps *eps) 1114{ 1115 if (ep == NULL) 1116 ep = new event_proc(); 1117 ep->add(eps); 1118 return (ep); 1119} 1120 1121eps * 1122new_action(const char *cmd) 1123{ 1124 eps *e = new action(cmd); 1125 free(const_cast<char *>(cmd)); 1126 return (e); 1127} 1128 1129eps * 1130new_match(const char *var, const char *re) 1131{ 1132 eps *e = new match(cfg, var, re); 1133 free(const_cast<char *>(var)); 1134 free(const_cast<char *>(re)); 1135 return (e); 1136} 1137 1138eps * 1139new_media(const char *var, const char *re) 1140{ 1141 eps *e = new media(cfg, var, re); 1142 free(const_cast<char *>(var)); 1143 free(const_cast<char *>(re)); 1144 return (e); 1145} 1146 1147void 1148set_pidfile(const char *name) 1149{ 1150 cfg.set_pidfile(name); 1151 free(const_cast<char *>(name)); 1152} 1153 1154void 1155set_variable(const char *var, const char *val) 1156{ 1157 cfg.set_variable(var, val); 1158 free(const_cast<char *>(var)); 1159 free(const_cast<char *>(val)); 1160} 1161 1162 1163 1164static void 1165gensighand(int) 1166{ 1167 romeo_must_die = 1; 1168} 1169 1170/* 1171 * SIGINFO handler. Will print useful statistics to the syslog or stderr 1172 * as appropriate 1173 */ 1174static void 1175siginfohand(int) 1176{ 1177 got_siginfo = 1; 1178} 1179 1180/* 1181 * Local logging function. Prints to syslog if we're daemonized; syslog 1182 * otherwise. 1183 */ 1184static void 1185devdlog(int priority, const char* fmt, ...) 1186{ 1187 va_list argp; 1188 1189 va_start(argp, fmt); 1190 if (no_daemon) 1191 vfprintf(stderr, fmt, argp); 1192 else if ((! quiet_mode) || (priority <= LOG_WARNING)) 1193 vsyslog(priority, fmt, argp); 1194 va_end(argp); 1195} 1196 1197static void 1198usage() 1199{ 1200 fprintf(stderr, "usage: %s [-dnq] [-l connlimit] [-f file]\n", 1201 getprogname()); 1202 exit(1); 1203} 1204 1205static void 1206check_devd_enabled() 1207{ 1208 int val = 0; 1209 size_t len; 1210 1211 len = sizeof(val); 1212 if (sysctlbyname(SYSCTL, &val, &len, NULL, 0) != 0) 1213 errx(1, "devctl sysctl missing from kernel!"); 1214 if (val == 0) { 1215 warnx("Setting " SYSCTL " to 1000"); 1216 val = 1000; 1217 if (sysctlbyname(SYSCTL, NULL, NULL, &val, sizeof(val))) 1218 err(1, "sysctlbyname"); 1219 } 1220} 1221 1222/* 1223 * main 1224 */ 1225int 1226main(int argc, char **argv) 1227{ 1228 int ch; 1229 1230 check_devd_enabled(); 1231 while ((ch = getopt(argc, argv, "df:l:nq")) != -1) { 1232 switch (ch) { 1233 case 'd': 1234 no_daemon = 1; 1235 break; 1236 case 'f': 1237 configfile = optarg; 1238 break; 1239 case 'l': 1240 max_clients = MAX(1, strtoul(optarg, NULL, 0)); 1241 break; 1242 case 'n': 1243 daemonize_quick = 1; 1244 break; 1245 case 'q': 1246 quiet_mode = 1; 1247 break; 1248 default: 1249 usage(); 1250 } 1251 } 1252 1253 cfg.parse(); 1254 if (!no_daemon && daemonize_quick) { 1255 cfg.open_pidfile(); 1256 daemon(0, 0); 1257 cfg.write_pidfile(); 1258 } 1259 signal(SIGPIPE, SIG_IGN); 1260 signal(SIGHUP, gensighand); 1261 signal(SIGINT, gensighand); 1262 signal(SIGTERM, gensighand); 1263 signal(SIGINFO, siginfohand); 1264 event_loop(); 1265 return (0); 1266} 1267