1 /* 2 * Copyright (c) 2010 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Alex Hornung <ahornung@gmail.com> 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 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 #include <sys/types.h> 35 #include <sys/device.h> 36 #include <sys/wait.h> 37 #include <sys/socket.h> 38 #include <sys/ioctl.h> 39 #include <sys/poll.h> 40 #include <sys/queue.h> 41 #include <sys/un.h> 42 #include <cpu/inttypes.h> 43 44 #include <err.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <libgen.h> 48 #include <regex.h> 49 #include <signal.h> 50 #include <stdarg.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <syslog.h> 55 #include <unistd.h> 56 #include <pthread.h> 57 58 #include <libprop/proplib.h> 59 #include <sys/udev.h> 60 #include "udevd.h" 61 62 int debugopt = 0; 63 64 static int udevfd; 65 static int hangup_ongoing = 0; 66 static struct pollfd fds[NFDS]; 67 68 extern pthread_mutex_t monitor_lock; 69 extern TAILQ_HEAD(udev_monitor_list_head, udev_monitor) udev_monitor_list; 70 extern TAILQ_HEAD(pdev_array_list_head, pdev_array_entry) pdev_array_list; 71 72 static void usage(void); 73 74 int match_dev_dict(prop_dictionary_t, prop_dictionary_t); 75 prop_dictionary_t find_dev_dict(int64_t, prop_dictionary_t, int *); 76 77 void udev_read_event(int); 78 prop_array_t udev_getdevs(int); 79 80 static 81 void 82 usage(void) 83 { 84 fprintf(stderr, "usage: udevd [-d]\n"); 85 exit(1); 86 } 87 88 int 89 match_dev_dict(prop_dictionary_t dict, prop_dictionary_t match_dict) 90 { 91 prop_number_t pn, pn2; 92 prop_string_t ps, ps2; 93 94 if (dict == NULL) 95 return 0; 96 97 if ((ps = prop_dictionary_get(dict, "name")) == NULL) 98 return 0; 99 if ((ps2 = prop_dictionary_get(match_dict, "name")) == NULL) 100 return 0; 101 if (!prop_string_equals(ps, ps2)) 102 return 0; 103 104 if ((pn = prop_dictionary_get(dict, "devnum")) == NULL) 105 return 0; 106 if ((pn2 = prop_dictionary_get(match_dict, "devnum")) == NULL) 107 return 0; 108 if (!prop_number_equals(pn, pn2)) 109 return 0; 110 111 if ((pn = prop_dictionary_get(dict, "kptr")) == NULL) 112 return 0; 113 if ((pn2 = prop_dictionary_get(match_dict, "kptr")) == NULL) 114 return 0; 115 if (!prop_number_equals(pn, pn2)) 116 return 0; 117 118 return 1; 119 } 120 121 prop_dictionary_t 122 find_dev_dict(int64_t generation, prop_dictionary_t match_dict, int *idx) 123 { 124 struct pdev_array_entry *pae; 125 prop_array_t pa; 126 prop_object_iterator_t iter; 127 prop_dictionary_t dict; 128 int i = 0; 129 130 if (generation == -1) 131 pae = pdev_array_entry_get_last(); 132 else 133 pae = pdev_array_entry_get(generation); 134 135 if (pae == NULL) 136 return NULL; 137 138 pa = pae->pdev_array; 139 140 iter = prop_array_iterator(pa); 141 if (iter == NULL) { 142 pdev_array_entry_unref(pae); 143 return NULL; 144 } 145 146 while ((dict = prop_object_iterator_next(iter)) != NULL) { 147 if (match_dev_dict(dict, match_dict)) 148 break; 149 ++i; 150 } 151 152 prop_object_iterator_release(iter); 153 154 if (idx != NULL) 155 *idx = i; 156 157 pdev_array_entry_unref(pae); 158 return dict; 159 } 160 161 void 162 udev_read_event(int fd) 163 { 164 struct pdev_array_entry *pae; 165 prop_dictionary_t dict, evdict, devdict; 166 prop_number_t pn; 167 prop_string_t ps; 168 prop_object_t po; 169 prop_array_t pa; 170 char *xml; 171 int n, idx, evtype; 172 size_t sz; 173 174 sz = 4096 * 1024; 175 176 xml = malloc(sz); /* 4 MB */ 177 again: 178 if ((n = read(fd, xml, sz)) <= 0) { 179 if (errno == ENOMEM) { 180 sz <<= 2; 181 realloc(xml, sz); 182 goto again; 183 } 184 free(xml); 185 return; 186 } 187 188 dict = prop_dictionary_internalize(xml); 189 free(xml); 190 if (dict == NULL) { 191 syslog(LOG_ERR, "internalization of xml failed"); 192 return; 193 } 194 195 pn = prop_dictionary_get(dict, "evtype"); 196 if (pn == NULL) { 197 syslog(LOG_ERR, "read_event: no key evtype"); 198 goto out; 199 } 200 201 evtype = prop_number_integer_value(pn); 202 203 evdict = prop_dictionary_get(dict, "evdict"); 204 if (evdict == NULL) { 205 syslog(LOG_ERR, "read_event: no key evdict"); 206 goto out; 207 } 208 209 switch (evtype) { 210 case UDEV_EVENT_ATTACH: 211 monitor_queue_event(dict); 212 pae = pdev_array_entry_get_last(); 213 pa = prop_array_copy(pae->pdev_array); 214 pdev_array_entry_unref(pae); 215 if (pa == NULL) 216 goto out; 217 prop_array_add(pa, evdict); 218 pdev_array_entry_insert(pa); 219 break; 220 221 case UDEV_EVENT_DETACH: 222 monitor_queue_event(dict); 223 if ((devdict = find_dev_dict(-1, evdict, &idx)) == NULL) 224 goto out; 225 pae = pdev_array_entry_get_last(); 226 pa = prop_array_copy(pae->pdev_array); 227 pdev_array_entry_unref(pae); 228 if (pa == NULL) 229 goto out; 230 prop_array_remove(pa, idx); 231 pdev_array_entry_insert(pa); 232 break; 233 234 case UDEV_EV_KEY_UPDATE: 235 if ((devdict = find_dev_dict(-1, evdict, NULL)) == NULL) 236 goto out; 237 if ((ps = prop_dictionary_get(evdict, "key")) == NULL) 238 goto out; 239 if ((po = prop_dictionary_get(evdict, "value")) == NULL) 240 goto out; 241 /* prop_object_retain(po); */ /* not necessary afaik */ 242 prop_dictionary_set(devdict, prop_string_cstring_nocopy(ps), po); 243 break; 244 245 case UDEV_EV_KEY_REMOVE: 246 if ((devdict = find_dev_dict(-1, evdict, NULL)) == NULL) 247 goto out; 248 if ((ps = prop_dictionary_get(evdict, "key")) == NULL) 249 goto out; 250 prop_dictionary_remove(devdict, prop_string_cstring_nocopy(ps)); 251 break; 252 253 default: 254 syslog(LOG_ERR, "read_event: unknown evtype %d", evtype); 255 } 256 257 out: 258 prop_object_release(dict); 259 return; 260 } 261 262 prop_array_t 263 udev_getdevs(int devfd) 264 { 265 prop_dictionary_t pd, rpd; 266 prop_string_t ps; 267 prop_array_t pa; 268 269 pd = prop_dictionary_create(); 270 if (pd == NULL) { 271 err(1, "prop_dictionary_create()"); 272 } 273 274 ps = prop_string_create_cstring("getdevs"); 275 if (ps == NULL) { 276 prop_object_release(pd); 277 err(1, "prop_string_create_cstring()"); 278 } 279 280 if (prop_dictionary_set(pd, "command", ps) == false) { 281 prop_object_release(ps); 282 prop_object_release(pd); 283 err(1, "prop_dictionary_set()"); 284 } 285 286 prop_object_release(ps); 287 288 /* Send dictionary to kernel space */ 289 if (prop_dictionary_sendrecv_ioctl(pd, devfd, UDEVPROP, &rpd) != 0) 290 err(1, "prop_array_recv_ioctl()"); 291 292 prop_object_release(pd); 293 294 pa = prop_dictionary_get(rpd, "array"); 295 if (pa == NULL) 296 goto out; 297 prop_object_retain(pa); 298 299 out: 300 prop_object_release(rpd); 301 return pa; 302 } 303 304 static void 305 killed(int sig __unused) 306 { 307 syslog(LOG_ERR, "udevd stopped"); 308 unlink("/var/run/udevd.pid"); 309 pdev_array_clean(); 310 exit(0); 311 } 312 313 static void 314 hangup(int sig __unused) 315 { 316 FILE *pidf; 317 int s; 318 319 syslog(LOG_ERR, "udevd hangup+resume"); 320 321 pidf = fopen("/var/run/udevd.pid", "w"); 322 if (pidf != NULL) { 323 fprintf(pidf, "%ld\n", (long)getpid()); 324 fclose(pidf); 325 } 326 327 hangup_ongoing = 1; 328 close(fds[UDEV_SOCKET_FD_IDX].fd); 329 pdev_array_clean(); 330 s = init_local_server(LISTEN_SOCKET_FILE, SOCK_STREAM, 0); 331 if (s < 0) 332 err(1, "init_local_server"); 333 334 fds[UDEV_SOCKET_FD_IDX].fd = s; 335 pdev_array_entry_insert(udev_getdevs(udevfd)); 336 hangup_ongoing = 0; 337 } 338 339 int 340 ignore_signal(int signum) 341 { 342 struct sigaction act; 343 int ret; 344 345 act.sa_handler = SIG_IGN; 346 sigemptyset(&act.sa_mask); 347 act.sa_flags = 0; 348 349 ret = sigaction(signum, &act, NULL); 350 return ret; 351 } 352 353 static int 354 set_signal(int signum, sig_t sig_func) 355 { 356 struct sigaction act; 357 int ret; 358 359 act.sa_handler = sig_func; 360 sigemptyset(&act.sa_mask); 361 act.sa_flags = 0; 362 363 ret = sigaction(signum, &act, NULL); 364 return ret; 365 } 366 367 int main(int argc, char *argv[]) 368 { 369 int error __unused, i, r, s; 370 FILE *pidf; 371 int ch = 0; 372 373 while ((ch = getopt(argc, argv, "d")) != -1) { 374 switch(ch) { 375 case 'd': 376 debugopt = 1; 377 break; 378 default: 379 usage(); 380 /* NOT REACHED */ 381 } 382 } 383 argc -= optind; 384 argv += optind; 385 386 TAILQ_INIT(&pdev_array_list); 387 TAILQ_INIT(&udev_monitor_list); 388 389 r = ignore_signal(SIGPIPE); 390 if (r != 0) 391 err(1, "could not ignore_signal SIGPIPE"); 392 393 r = pthread_mutex_init(&(monitor_lock), NULL); 394 if (r != 0) 395 err(1, "could not allocate a pthread_mutex"); 396 397 if ((udevfd = open(UDEV_DEVICE_PATH, O_RDWR | O_NONBLOCK)) == -1) 398 err(1, "%s", UDEV_DEVICE_PATH); 399 unblock_descriptor(udevfd); 400 401 s = init_local_server(LISTEN_SOCKET_FILE, SOCK_STREAM, 0); 402 if (s < 0) 403 err(1, "init_local_server"); 404 405 pidf = fopen("/var/run/udevd.pid", "w"); 406 #if 0 407 if (pidf == NULL) 408 err(1, "pidfile"); 409 #endif 410 411 set_signal(SIGTERM, killed); 412 set_signal(SIGHUP, hangup); 413 414 if (debugopt == 0) 415 if (daemon(0, 0) == -1) 416 err(1, "daemon"); 417 418 if (pidf != NULL) { 419 fprintf(pidf, "%ld\n", (long)getpid()); 420 fclose(pidf); 421 } 422 423 syslog(LOG_ERR, "udevd started"); 424 425 pdev_array_entry_insert(udev_getdevs(udevfd)); 426 427 memset(fds, 0 , sizeof(fds)); 428 fds[UDEV_DEVICE_FD_IDX].fd = udevfd; 429 fds[UDEV_DEVICE_FD_IDX].events = POLLIN; 430 fds[UDEV_SOCKET_FD_IDX].fd = s; 431 fds[UDEV_SOCKET_FD_IDX].events = POLLIN | POLLPRI; 432 433 for (;;) { 434 r = poll(fds, NFDS, -1); 435 if (r < 0) { 436 if (hangup_ongoing == 0) { 437 if (errno == EINTR) { 438 usleep(5000); 439 continue; 440 } else { 441 err(1, "polling..."); 442 } 443 } else { 444 usleep(20000); /* 20 ms */ 445 continue; 446 } 447 } 448 449 for (i = 0; (i < NFDS) && (r > 0); i++) { 450 if (fds[i].revents == 0) 451 continue; 452 453 --r; 454 switch (i) { 455 case UDEV_DEVICE_FD_IDX: 456 udev_read_event(udevfd); 457 break; 458 case UDEV_SOCKET_FD_IDX: 459 handle_new_connection(s); 460 break; 461 default: 462 break; 463 } 464 } 465 } 466 467 syslog(LOG_ERR, "udevd is exiting normally"); 468 return 0; 469 } 470