San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 1 | /* dnsmasq is Copyright (c) 2000-2009 Simon Kelley |
| 2 | |
| 3 | This program is free software; you can redistribute it and/or modify |
| 4 | it under the terms of the GNU General Public License as published by |
| 5 | the Free Software Foundation; version 2 dated June, 1991, or |
| 6 | (at your option) version 3 dated 29 June, 2007. |
| 7 | |
| 8 | This program is distributed in the hope that it will be useful, |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | GNU General Public License for more details. |
| 12 | |
| 13 | You should have received a copy of the GNU General Public License |
| 14 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | |
| 17 | #define COPYRIGHT "Copyright (C) 2000-2009 Simon Kelley" |
| 18 | |
| 19 | #ifndef NO_LARGEFILE |
| 20 | /* Ensure we can use files >2GB (log files may grow this big) */ |
| 21 | # define _LARGEFILE_SOURCE 1 |
| 22 | # define _FILE_OFFSET_BITS 64 |
| 23 | #endif |
| 24 | |
| 25 | /* Get linux C library versions. */ |
| 26 | #ifdef __linux__ |
San Mehat | 5658bcb | 2010-01-20 10:16:30 -0800 | [diff] [blame] | 27 | # ifndef __ANDROID__ |
| 28 | # define _GNU_SOURCE |
| 29 | # endif |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 30 | # include <features.h> |
| 31 | #endif |
| 32 | |
| 33 | /* get these before config.h for IPv6 stuff... */ |
| 34 | #include <sys/types.h> |
| 35 | #include <sys/socket.h> |
| 36 | #include <netinet/in.h> |
| 37 | |
| 38 | #ifdef __APPLE__ |
| 39 | # include <nameser.h> |
| 40 | # include <arpa/nameser_compat.h> |
| 41 | #else |
San Mehat | 5658bcb | 2010-01-20 10:16:30 -0800 | [diff] [blame] | 42 | # ifdef __ANDROID__ |
| 43 | # include "nameser.h" |
| 44 | # else |
| 45 | # include <arpa/nameser.h> |
| 46 | # endif |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 47 | #endif |
| 48 | |
| 49 | /* and this. */ |
| 50 | #include <getopt.h> |
| 51 | |
| 52 | #include "config.h" |
| 53 | |
| 54 | #define gettext_noop(S) (S) |
| 55 | #ifndef LOCALEDIR |
| 56 | # define _(S) (S) |
| 57 | #else |
| 58 | # include <libintl.h> |
| 59 | # include <locale.h> |
| 60 | # define _(S) gettext(S) |
| 61 | #endif |
| 62 | |
| 63 | #include <arpa/inet.h> |
| 64 | #include <sys/stat.h> |
| 65 | #include <sys/ioctl.h> |
| 66 | #if defined(HAVE_SOLARIS_NETWORK) |
| 67 | #include <sys/sockio.h> |
| 68 | #endif |
| 69 | #include <sys/select.h> |
| 70 | #include <sys/wait.h> |
| 71 | #include <sys/time.h> |
| 72 | #include <sys/un.h> |
| 73 | #include <limits.h> |
| 74 | #include <net/if.h> |
| 75 | #include <unistd.h> |
| 76 | #include <stdio.h> |
| 77 | #include <string.h> |
| 78 | #include <stdlib.h> |
| 79 | #include <fcntl.h> |
| 80 | #include <ctype.h> |
| 81 | #include <signal.h> |
| 82 | #include <stddef.h> |
| 83 | #include <time.h> |
| 84 | #include <errno.h> |
| 85 | #include <pwd.h> |
| 86 | #include <grp.h> |
| 87 | #include <stdarg.h> |
San Mehat | 5658bcb | 2010-01-20 10:16:30 -0800 | [diff] [blame] | 88 | #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__) |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 89 | # include <netinet/if_ether.h> |
| 90 | #else |
| 91 | # include <net/ethernet.h> |
| 92 | #endif |
| 93 | #include <net/if_arp.h> |
| 94 | #include <netinet/in_systm.h> |
| 95 | #include <netinet/ip.h> |
| 96 | #include <netinet/ip_icmp.h> |
| 97 | #include <sys/uio.h> |
| 98 | #include <syslog.h> |
| 99 | #include <dirent.h> |
| 100 | #ifndef HAVE_LINUX_NETWORK |
| 101 | # include <net/if_dl.h> |
| 102 | #endif |
| 103 | |
| 104 | #if defined(HAVE_LINUX_NETWORK) |
| 105 | #include <linux/capability.h> |
| 106 | /* There doesn't seem to be a universally-available |
| 107 | userpace header for these. */ |
| 108 | extern int capset(cap_user_header_t header, cap_user_data_t data); |
| 109 | extern int capget(cap_user_header_t header, cap_user_data_t data); |
| 110 | #define LINUX_CAPABILITY_VERSION_1 0x19980330 |
| 111 | #define LINUX_CAPABILITY_VERSION_2 0x20071026 |
| 112 | #define LINUX_CAPABILITY_VERSION_3 0x20080522 |
| 113 | |
| 114 | #include <sys/prctl.h> |
| 115 | #elif defined(HAVE_SOLARIS_NETWORK) |
| 116 | #include <priv.h> |
| 117 | #endif |
| 118 | |
| 119 | /* daemon is function in the C library.... */ |
| 120 | #define daemon dnsmasq_daemon |
| 121 | |
| 122 | /* Async event queue */ |
| 123 | struct event_desc { |
| 124 | int event, data; |
| 125 | }; |
| 126 | |
| 127 | #define EVENT_RELOAD 1 |
| 128 | #define EVENT_DUMP 2 |
| 129 | #define EVENT_ALARM 3 |
| 130 | #define EVENT_TERM 4 |
| 131 | #define EVENT_CHILD 5 |
| 132 | #define EVENT_REOPEN 6 |
| 133 | #define EVENT_EXITED 7 |
| 134 | #define EVENT_KILLED 8 |
| 135 | #define EVENT_EXEC_ERR 9 |
| 136 | #define EVENT_PIPE_ERR 10 |
| 137 | #define EVENT_USER_ERR 11 |
| 138 | #define EVENT_CAP_ERR 12 |
| 139 | #define EVENT_PIDFILE 13 |
| 140 | #define EVENT_HUSER_ERR 14 |
| 141 | #define EVENT_GROUP_ERR 15 |
| 142 | #define EVENT_DIE 16 |
| 143 | #define EVENT_LOG_ERR 17 |
| 144 | #define EVENT_FORK_ERR 18 |
| 145 | |
| 146 | /* Exit codes. */ |
| 147 | #define EC_GOOD 0 |
| 148 | #define EC_BADCONF 1 |
| 149 | #define EC_BADNET 2 |
| 150 | #define EC_FILE 3 |
| 151 | #define EC_NOMEM 4 |
| 152 | #define EC_MISC 5 |
| 153 | #define EC_INIT_OFFSET 10 |
| 154 | |
| 155 | /* Min buffer size: we check after adding each record, so there must be |
| 156 | memory for the largest packet, and the largest record so the |
| 157 | min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000. |
| 158 | This might be increased is EDNS packet size if greater than the minimum. |
| 159 | */ |
| 160 | #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ |
| 161 | |
| 162 | #define OPT_BOGUSPRIV (1u<<0) |
| 163 | #define OPT_FILTER (1u<<1) |
| 164 | #define OPT_LOG (1u<<2) |
| 165 | #define OPT_SELFMX (1u<<3) |
| 166 | #define OPT_NO_HOSTS (1u<<4) |
| 167 | #define OPT_NO_POLL (1u<<5) |
| 168 | #define OPT_DEBUG (1u<<6) |
| 169 | #define OPT_ORDER (1u<<7) |
| 170 | #define OPT_NO_RESOLV (1u<<8) |
| 171 | #define OPT_EXPAND (1u<<9) |
| 172 | #define OPT_LOCALMX (1u<<10) |
| 173 | #define OPT_NO_NEG (1u<<11) |
| 174 | #define OPT_NODOTS_LOCAL (1u<<12) |
| 175 | #define OPT_NOWILD (1u<<13) |
| 176 | #define OPT_ETHERS (1u<<14) |
| 177 | #define OPT_RESOLV_DOMAIN (1u<<15) |
| 178 | #define OPT_NO_FORK (1u<<16) |
| 179 | #define OPT_AUTHORITATIVE (1u<<17) |
| 180 | #define OPT_LOCALISE (1u<<18) |
| 181 | #define OPT_DBUS (1u<<19) |
| 182 | #define OPT_DHCP_FQDN (1u<<20) |
| 183 | #define OPT_NO_PING (1u<<21) |
| 184 | #define OPT_LEASE_RO (1u<<22) |
| 185 | #define OPT_ALL_SERVERS (1u<<23) |
| 186 | #define OPT_RELOAD (1u<<24) |
| 187 | #define OPT_TFTP (1u<<25) |
| 188 | #define OPT_TFTP_SECURE (1u<<26) |
| 189 | #define OPT_TFTP_NOBLOCK (1u<<27) |
| 190 | #define OPT_LOG_OPTS (1u<<28) |
| 191 | #define OPT_TFTP_APREF (1u<<29) |
| 192 | #define OPT_NO_OVERRIDE (1u<<30) |
| 193 | #define OPT_NO_REBIND (1u<<31) |
| 194 | |
| 195 | /* extra flags for my_syslog, we use a couple of facilities since they are known |
| 196 | not to occupy the same bits as priorities, no matter how syslog.h is set up. */ |
| 197 | #define MS_TFTP LOG_USER |
| 198 | #define MS_DHCP LOG_DAEMON |
| 199 | |
| 200 | struct all_addr { |
| 201 | union { |
| 202 | struct in_addr addr4; |
| 203 | #ifdef HAVE_IPV6 |
| 204 | struct in6_addr addr6; |
| 205 | #endif |
| 206 | } addr; |
| 207 | }; |
| 208 | |
| 209 | struct bogus_addr { |
| 210 | struct in_addr addr; |
| 211 | struct bogus_addr *next; |
| 212 | }; |
| 213 | |
| 214 | /* dns doctor param */ |
| 215 | struct doctor { |
| 216 | struct in_addr in, end, out, mask; |
| 217 | struct doctor *next; |
| 218 | }; |
| 219 | |
| 220 | struct mx_srv_record { |
| 221 | char *name, *target; |
| 222 | int issrv, srvport, priority, weight; |
| 223 | unsigned int offset; |
| 224 | struct mx_srv_record *next; |
| 225 | }; |
| 226 | |
| 227 | struct naptr { |
| 228 | char *name, *replace, *regexp, *services, *flags; |
| 229 | unsigned int order, pref; |
| 230 | struct naptr *next; |
| 231 | }; |
| 232 | |
| 233 | struct txt_record { |
| 234 | char *name, *txt; |
| 235 | unsigned short class, len; |
| 236 | struct txt_record *next; |
| 237 | }; |
| 238 | |
| 239 | struct ptr_record { |
| 240 | char *name, *ptr; |
| 241 | struct ptr_record *next; |
| 242 | }; |
| 243 | |
| 244 | struct cname { |
| 245 | char *alias, *target; |
| 246 | struct cname *next; |
| 247 | }; |
| 248 | |
| 249 | struct interface_name { |
| 250 | char *name; /* domain name */ |
| 251 | char *intr; /* interface name */ |
| 252 | struct interface_name *next; |
| 253 | }; |
| 254 | |
| 255 | union bigname { |
| 256 | char name[MAXDNAME]; |
| 257 | union bigname *next; /* freelist */ |
| 258 | }; |
| 259 | |
| 260 | struct crec { |
| 261 | struct crec *next, *prev, *hash_next; |
| 262 | time_t ttd; /* time to die */ |
| 263 | int uid; |
| 264 | union { |
| 265 | struct all_addr addr; |
| 266 | struct { |
| 267 | struct crec *cache; |
| 268 | int uid; |
| 269 | } cname; |
| 270 | } addr; |
| 271 | unsigned short flags; |
| 272 | union { |
| 273 | char sname[SMALLDNAME]; |
| 274 | union bigname *bname; |
| 275 | char *namep; |
| 276 | } name; |
| 277 | }; |
| 278 | |
| 279 | #define F_IMMORTAL 1 |
| 280 | #define F_CONFIG 2 |
| 281 | #define F_REVERSE 4 |
| 282 | #define F_FORWARD 8 |
| 283 | #define F_DHCP 16 |
| 284 | #define F_NEG 32 |
| 285 | #define F_HOSTS 64 |
| 286 | #define F_IPV4 128 |
| 287 | #define F_IPV6 256 |
| 288 | #define F_BIGNAME 512 |
| 289 | #define F_UPSTREAM 1024 |
| 290 | #define F_SERVER 2048 |
| 291 | #define F_NXDOMAIN 4096 |
| 292 | #define F_QUERY 8192 |
| 293 | #define F_CNAME 16384 |
| 294 | #define F_NOERR 32768 |
| 295 | |
| 296 | /* struct sockaddr is not large enough to hold any address, |
| 297 | and specifically not big enough to hold an IPv6 address. |
| 298 | Blech. Roll our own. */ |
| 299 | union mysockaddr { |
| 300 | struct sockaddr sa; |
| 301 | struct sockaddr_in in; |
| 302 | #if defined(HAVE_IPV6) |
| 303 | struct sockaddr_in6 in6; |
| 304 | #endif |
| 305 | }; |
| 306 | |
| 307 | #define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */ |
| 308 | #define SERV_NO_ADDR 2 /* no server, this domain is local only */ |
| 309 | #define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */ |
| 310 | #define SERV_HAS_DOMAIN 8 /* server for one domain only */ |
| 311 | #define SERV_HAS_SOURCE 16 /* source address defined */ |
| 312 | #define SERV_FOR_NODOTS 32 /* server for names with no domain part only */ |
| 313 | #define SERV_WARNED_RECURSIVE 64 /* avoid warning spam */ |
| 314 | #define SERV_FROM_DBUS 128 /* 1 if source is DBus */ |
| 315 | #define SERV_MARK 256 /* for mark-and-delete */ |
| 316 | #define SERV_TYPE (SERV_HAS_DOMAIN | SERV_FOR_NODOTS) |
| 317 | #define SERV_COUNTED 512 /* workspace for log code */ |
| 318 | |
| 319 | struct serverfd { |
| 320 | int fd; |
| 321 | union mysockaddr source_addr; |
| 322 | char interface[IF_NAMESIZE+1]; |
| 323 | struct serverfd *next; |
Lorenzo Colitti | 68eff53 | 2014-08-26 14:06:34 -0700 | [diff] [blame] | 324 | uint32_t mark; |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 325 | }; |
| 326 | |
| 327 | struct randfd { |
| 328 | int fd; |
| 329 | unsigned short refcount, family; |
| 330 | }; |
| 331 | |
| 332 | struct server { |
| 333 | union mysockaddr addr, source_addr; |
| 334 | char interface[IF_NAMESIZE+1]; |
| 335 | struct serverfd *sfd; |
| 336 | char *domain; /* set if this server only handles a domain. */ |
| 337 | int flags, tcpfd; |
| 338 | unsigned int queries, failed_queries; |
Lorenzo Colitti | 68eff53 | 2014-08-26 14:06:34 -0700 | [diff] [blame] | 339 | uint32_t mark; |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 340 | struct server *next; |
| 341 | }; |
| 342 | |
| 343 | struct irec { |
| 344 | union mysockaddr addr; |
| 345 | struct in_addr netmask; /* only valid for IPv4 */ |
| 346 | int dhcp_ok, mtu; |
| 347 | struct irec *next; |
| 348 | }; |
| 349 | |
| 350 | struct listener { |
| 351 | int fd, tcpfd, tftpfd, family; |
| 352 | struct irec *iface; /* only valid for non-wildcard */ |
| 353 | struct listener *next; |
| 354 | }; |
| 355 | |
| 356 | /* interface and address parms from command line. */ |
| 357 | struct iname { |
| 358 | char *name; |
| 359 | union mysockaddr addr; |
| 360 | int isloop, used; |
| 361 | struct iname *next; |
| 362 | }; |
| 363 | |
| 364 | /* resolv-file parms from command-line */ |
| 365 | struct resolvc { |
| 366 | struct resolvc *next; |
| 367 | int is_default, logged; |
| 368 | time_t mtime; |
| 369 | char *name; |
| 370 | }; |
| 371 | |
| 372 | /* adn-hosts parms from command-line */ |
| 373 | #define AH_DIR 1 |
| 374 | #define AH_INACTIVE 2 |
| 375 | struct hostsfile { |
| 376 | struct hostsfile *next; |
| 377 | int flags; |
| 378 | char *fname; |
| 379 | int index; /* matches to cache entries for logging */ |
| 380 | }; |
| 381 | |
| 382 | struct frec { |
| 383 | union mysockaddr source; |
| 384 | struct all_addr dest; |
| 385 | struct server *sentto; /* NULL means free */ |
| 386 | struct randfd *rfd4; |
| 387 | #ifdef HAVE_IPV6 |
| 388 | struct randfd *rfd6; |
| 389 | #endif |
| 390 | unsigned int iface; |
| 391 | unsigned short orig_id, new_id; |
| 392 | int fd, forwardall; |
| 393 | unsigned int crc; |
| 394 | time_t time; |
| 395 | struct frec *next; |
| 396 | }; |
| 397 | |
| 398 | /* actions in the daemon->helper RPC */ |
| 399 | #define ACTION_DEL 1 |
| 400 | #define ACTION_OLD_HOSTNAME 2 |
| 401 | #define ACTION_OLD 3 |
| 402 | #define ACTION_ADD 4 |
| 403 | |
| 404 | #define DHCP_CHADDR_MAX 16 |
| 405 | |
| 406 | struct dhcp_lease { |
| 407 | int clid_len; /* length of client identifier */ |
| 408 | unsigned char *clid; /* clientid */ |
| 409 | char *hostname, *fqdn; /* name from client-hostname option or config */ |
| 410 | char *old_hostname; /* hostname before it moved to another lease */ |
| 411 | char auth_name; /* hostname came from config, not from client */ |
| 412 | char new; /* newly created */ |
| 413 | char changed; /* modified */ |
| 414 | char aux_changed; /* CLID or expiry changed */ |
| 415 | time_t expires; /* lease expiry */ |
| 416 | #ifdef HAVE_BROKEN_RTC |
| 417 | unsigned int length; |
| 418 | #endif |
| 419 | int hwaddr_len, hwaddr_type; |
| 420 | unsigned char hwaddr[DHCP_CHADDR_MAX]; |
| 421 | struct in_addr addr, override, giaddr; |
| 422 | unsigned char *vendorclass, *userclass, *supplied_hostname; |
| 423 | unsigned int vendorclass_len, userclass_len, supplied_hostname_len; |
| 424 | int last_interface; |
| 425 | struct dhcp_lease *next; |
| 426 | }; |
| 427 | |
| 428 | struct dhcp_netid { |
| 429 | char *net; |
| 430 | struct dhcp_netid *next; |
| 431 | }; |
| 432 | |
| 433 | struct dhcp_netid_list { |
| 434 | struct dhcp_netid *list; |
| 435 | struct dhcp_netid_list *next; |
| 436 | }; |
| 437 | |
| 438 | struct hwaddr_config { |
| 439 | int hwaddr_len, hwaddr_type; |
| 440 | unsigned char hwaddr[DHCP_CHADDR_MAX]; |
| 441 | unsigned int wildcard_mask; |
| 442 | struct hwaddr_config *next; |
| 443 | }; |
| 444 | |
| 445 | struct dhcp_config { |
| 446 | unsigned int flags; |
| 447 | int clid_len; /* length of client identifier */ |
| 448 | unsigned char *clid; /* clientid */ |
| 449 | char *hostname, *domain; |
| 450 | struct dhcp_netid netid; |
| 451 | struct in_addr addr; |
| 452 | time_t decline_time; |
| 453 | unsigned int lease_time; |
| 454 | struct hwaddr_config *hwaddr; |
| 455 | struct dhcp_config *next; |
| 456 | }; |
| 457 | |
| 458 | #define CONFIG_DISABLE 1 |
| 459 | #define CONFIG_CLID 2 |
| 460 | #define CONFIG_TIME 8 |
| 461 | #define CONFIG_NAME 16 |
| 462 | #define CONFIG_ADDR 32 |
| 463 | #define CONFIG_NETID 64 |
| 464 | #define CONFIG_NOCLID 128 |
| 465 | #define CONFIG_FROM_ETHERS 256 /* entry created by /etc/ethers */ |
| 466 | #define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */ |
| 467 | #define CONFIG_DECLINED 1024 /* address declined by client */ |
| 468 | #define CONFIG_BANK 2048 /* from dhcp hosts file */ |
| 469 | |
| 470 | struct dhcp_opt { |
| 471 | int opt, len, flags; |
| 472 | union { |
| 473 | int encap; |
| 474 | unsigned int wildcard_mask; |
| 475 | unsigned char *vendor_class; |
| 476 | } u; |
| 477 | unsigned char *val; |
| 478 | struct dhcp_netid *netid; |
| 479 | struct dhcp_opt *next; |
| 480 | }; |
| 481 | |
| 482 | #define DHOPT_ADDR 1 |
| 483 | #define DHOPT_STRING 2 |
| 484 | #define DHOPT_ENCAPSULATE 4 |
| 485 | #define DHOPT_ENCAP_MATCH 8 |
| 486 | #define DHOPT_FORCE 16 |
| 487 | #define DHOPT_BANK 32 |
| 488 | #define DHOPT_ENCAP_DONE 64 |
| 489 | #define DHOPT_MATCH 128 |
| 490 | #define DHOPT_VENDOR 256 |
| 491 | #define DHOPT_HEX 512 |
| 492 | #define DHOPT_VENDOR_MATCH 1024 |
| 493 | |
| 494 | struct dhcp_boot { |
| 495 | char *file, *sname; |
| 496 | struct in_addr next_server; |
| 497 | struct dhcp_netid *netid; |
| 498 | struct dhcp_boot *next; |
| 499 | }; |
| 500 | |
| 501 | struct pxe_service { |
| 502 | unsigned short CSA, type; |
| 503 | char *menu, *basename; |
| 504 | struct in_addr server; |
| 505 | struct dhcp_netid *netid; |
| 506 | struct pxe_service *next; |
| 507 | }; |
| 508 | |
| 509 | #define MATCH_VENDOR 1 |
| 510 | #define MATCH_USER 2 |
| 511 | #define MATCH_CIRCUIT 3 |
| 512 | #define MATCH_REMOTE 4 |
| 513 | #define MATCH_SUBSCRIBER 5 |
| 514 | |
| 515 | /* vendorclass, userclass, remote-id or cicuit-id */ |
| 516 | struct dhcp_vendor { |
| 517 | int len, match_type, option; |
| 518 | char *data; |
| 519 | struct dhcp_netid netid; |
| 520 | struct dhcp_vendor *next; |
| 521 | }; |
| 522 | |
| 523 | struct dhcp_mac { |
| 524 | unsigned int mask; |
| 525 | int hwaddr_len, hwaddr_type; |
| 526 | unsigned char hwaddr[DHCP_CHADDR_MAX]; |
| 527 | struct dhcp_netid netid; |
| 528 | struct dhcp_mac *next; |
| 529 | }; |
| 530 | |
| 531 | struct dhcp_bridge { |
| 532 | char iface[IF_NAMESIZE]; |
| 533 | struct dhcp_bridge *alias, *next; |
| 534 | }; |
| 535 | |
| 536 | struct cond_domain { |
| 537 | char *domain; |
| 538 | struct in_addr start, end; |
| 539 | struct cond_domain *next; |
| 540 | }; |
| 541 | |
| 542 | struct dhcp_context { |
| 543 | unsigned int lease_time, addr_epoch; |
| 544 | struct in_addr netmask, broadcast; |
| 545 | struct in_addr local, router; |
| 546 | struct in_addr start, end; /* range of available addresses */ |
| 547 | int flags; |
| 548 | struct dhcp_netid netid, *filter; |
| 549 | struct dhcp_context *next, *current; |
| 550 | }; |
| 551 | |
| 552 | #define CONTEXT_STATIC 1 |
| 553 | #define CONTEXT_NETMASK 2 |
| 554 | #define CONTEXT_BRDCAST 4 |
| 555 | #define CONTEXT_PROXY 8 |
| 556 | |
| 557 | |
| 558 | typedef unsigned char u8; |
| 559 | typedef unsigned short u16; |
| 560 | typedef unsigned int u32; |
| 561 | |
| 562 | |
| 563 | struct dhcp_packet { |
| 564 | u8 op, htype, hlen, hops; |
| 565 | u32 xid; |
| 566 | u16 secs, flags; |
| 567 | struct in_addr ciaddr, yiaddr, siaddr, giaddr; |
| 568 | u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128]; |
| 569 | u8 options[312]; |
| 570 | }; |
| 571 | |
| 572 | struct ping_result { |
| 573 | struct in_addr addr; |
| 574 | time_t time; |
| 575 | struct ping_result *next; |
| 576 | }; |
| 577 | |
| 578 | struct tftp_file { |
| 579 | int refcount, fd; |
| 580 | off_t size; |
| 581 | dev_t dev; |
| 582 | ino_t inode; |
| 583 | char filename[]; |
| 584 | }; |
| 585 | |
| 586 | struct tftp_transfer { |
| 587 | int sockfd; |
| 588 | time_t timeout; |
| 589 | int backoff; |
| 590 | unsigned int block, blocksize, expansion; |
| 591 | off_t offset; |
| 592 | struct sockaddr_in peer; |
| 593 | char opt_blocksize, opt_transize, netascii, carrylf; |
| 594 | struct tftp_file *file; |
| 595 | struct tftp_transfer *next; |
| 596 | }; |
| 597 | |
| 598 | extern struct daemon { |
| 599 | /* datastuctures representing the command-line and |
| 600 | config file arguments. All set (including defaults) |
| 601 | in option.c */ |
| 602 | |
| 603 | unsigned int options; |
| 604 | struct resolvc default_resolv, *resolv_files; |
| 605 | time_t last_resolv; |
| 606 | struct mx_srv_record *mxnames; |
| 607 | struct naptr *naptr; |
| 608 | struct txt_record *txt; |
| 609 | struct ptr_record *ptr; |
| 610 | struct cname *cnames; |
| 611 | struct interface_name *int_names; |
| 612 | char *mxtarget; |
| 613 | char *lease_file; |
| 614 | char *username, *groupname, *scriptuser; |
| 615 | int group_set, osport; |
| 616 | char *domain_suffix; |
| 617 | struct cond_domain *cond_domain; |
| 618 | char *runfile; |
| 619 | char *lease_change_command; |
| 620 | struct iname *if_names, *if_addrs, *if_except, *dhcp_except; |
| 621 | struct bogus_addr *bogus_addr; |
| 622 | struct server *servers; |
| 623 | int log_fac; /* log facility */ |
| 624 | char *log_file; /* optional log file */ |
| 625 | int max_logs; /* queue limit */ |
| 626 | int cachesize, ftabsize; |
| 627 | int port, query_port, min_port; |
| 628 | unsigned long local_ttl, neg_ttl; |
| 629 | struct hostsfile *addn_hosts; |
| 630 | struct dhcp_context *dhcp; |
| 631 | struct dhcp_config *dhcp_conf; |
| 632 | struct dhcp_opt *dhcp_opts, *dhcp_match; |
| 633 | struct dhcp_vendor *dhcp_vendors; |
| 634 | struct dhcp_mac *dhcp_macs; |
| 635 | struct dhcp_boot *boot_config; |
| 636 | struct pxe_service *pxe_services; |
| 637 | int enable_pxe; |
| 638 | struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic; |
| 639 | char *dhcp_hosts_file, *dhcp_opts_file; |
| 640 | int dhcp_max, tftp_max; |
| 641 | int dhcp_server_port, dhcp_client_port; |
| 642 | int start_tftp_port, end_tftp_port; |
| 643 | unsigned int min_leasetime; |
| 644 | struct doctor *doctors; |
| 645 | unsigned short edns_pktsz; |
| 646 | char *tftp_prefix; |
| 647 | |
| 648 | /* globally used stuff for DNS */ |
| 649 | char *packet; /* packet buffer */ |
| 650 | int packet_buff_sz; /* size of above */ |
| 651 | char *namebuff; /* MAXDNAME size buffer */ |
| 652 | unsigned int local_answer, queries_forwarded; |
| 653 | struct frec *frec_list; |
| 654 | struct serverfd *sfds; |
| 655 | struct irec *interfaces; |
| 656 | struct listener *listeners; |
| 657 | struct server *last_server; |
| 658 | time_t forwardtime; |
| 659 | int forwardcount; |
| 660 | struct server *srv_save; /* Used for resend on DoD */ |
| 661 | size_t packet_len; /* " " */ |
| 662 | struct randfd *rfd_save; /* " " */ |
| 663 | pid_t tcp_pids[MAX_PROCS]; |
| 664 | struct randfd randomsocks[RANDOM_SOCKS]; |
| 665 | |
| 666 | /* DHCP state */ |
| 667 | int dhcpfd, helperfd; |
| 668 | #if defined(HAVE_LINUX_NETWORK) |
| 669 | int netlinkfd; |
| 670 | #elif defined(HAVE_BSD_NETWORK) |
| 671 | int dhcp_raw_fd, dhcp_icmp_fd; |
| 672 | #endif |
| 673 | struct iovec dhcp_packet; |
| 674 | char *dhcp_buff, *dhcp_buff2; |
| 675 | struct ping_result *ping_results; |
| 676 | FILE *lease_stream; |
| 677 | struct dhcp_bridge *bridges; |
| 678 | |
| 679 | /* DBus stuff */ |
| 680 | /* void * here to avoid depending on dbus headers outside dbus.c */ |
| 681 | void *dbus; |
| 682 | #ifdef HAVE_DBUS |
| 683 | struct watch *watches; |
| 684 | #endif |
| 685 | |
| 686 | /* TFTP stuff */ |
| 687 | struct tftp_transfer *tftp_trans; |
| 688 | |
| 689 | } *daemon; |
| 690 | |
| 691 | /* cache.c */ |
| 692 | void cache_init(void); |
| 693 | void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg); |
| 694 | char *record_source(int index); |
| 695 | void querystr(char *str, unsigned short type); |
| 696 | struct crec *cache_find_by_addr(struct crec *crecp, |
| 697 | struct all_addr *addr, time_t now, |
| 698 | unsigned short prot); |
| 699 | struct crec *cache_find_by_name(struct crec *crecp, |
| 700 | char *name, time_t now, unsigned short prot); |
| 701 | void cache_end_insert(void); |
| 702 | void cache_start_insert(void); |
| 703 | struct crec *cache_insert(char *name, struct all_addr *addr, |
| 704 | time_t now, unsigned long ttl, unsigned short flags); |
| 705 | void cache_reload(void); |
| 706 | void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd); |
| 707 | void cache_unhash_dhcp(void); |
| 708 | void dump_cache(time_t now); |
| 709 | char *cache_get_name(struct crec *crecp); |
| 710 | char *get_domain(struct in_addr addr); |
| 711 | |
| 712 | /* rfc1035.c */ |
| 713 | unsigned short extract_request(HEADER *header, size_t qlen, |
| 714 | char *name, unsigned short *typep); |
| 715 | size_t setup_reply(HEADER *header, size_t qlen, |
| 716 | struct all_addr *addrp, unsigned short flags, |
| 717 | unsigned long local_ttl); |
| 718 | int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now); |
| 719 | size_t answer_request(HEADER *header, char *limit, size_t qlen, |
| 720 | struct in_addr local_addr, struct in_addr local_netmask, time_t now); |
| 721 | int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name, |
| 722 | struct bogus_addr *addr, time_t now); |
| 723 | unsigned char *find_pseudoheader(HEADER *header, size_t plen, |
| 724 | size_t *len, unsigned char **p, int *is_sign); |
| 725 | int check_for_local_domain(char *name, time_t now); |
| 726 | unsigned int questions_crc(HEADER *header, size_t plen, char *buff); |
| 727 | size_t resize_packet(HEADER *header, size_t plen, |
| 728 | unsigned char *pheader, size_t hlen); |
| 729 | |
| 730 | /* util.c */ |
| 731 | void rand_init(void); |
| 732 | unsigned short rand16(void); |
| 733 | int legal_hostname(char *c); |
| 734 | char *canonicalise(char *s, int *nomem); |
| 735 | unsigned char *do_rfc1035_name(unsigned char *p, char *sval); |
| 736 | void *safe_malloc(size_t size); |
| 737 | void safe_pipe(int *fd, int read_noblock); |
| 738 | void *whine_malloc(size_t size); |
| 739 | int sa_len(union mysockaddr *addr); |
| 740 | int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2); |
| 741 | int hostname_isequal(char *a, char *b); |
| 742 | time_t dnsmasq_time(void); |
| 743 | int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask); |
| 744 | int retry_send(void); |
| 745 | void prettyprint_time(char *buf, unsigned int t); |
| 746 | int prettyprint_addr(union mysockaddr *addr, char *buf); |
| 747 | int parse_hex(char *in, unsigned char *out, int maxlen, |
| 748 | unsigned int *wildcard_mask, int *mac_type); |
| 749 | int memcmp_masked(unsigned char *a, unsigned char *b, int len, |
| 750 | unsigned int mask); |
| 751 | int expand_buf(struct iovec *iov, size_t size); |
| 752 | char *print_mac(char *buff, unsigned char *mac, int len); |
| 753 | void bump_maxfd(int fd, int *max); |
| 754 | int read_write(int fd, unsigned char *packet, int size, int rw); |
| 755 | |
| 756 | /* log.c */ |
| 757 | void die(char *message, char *arg1, int exit_code); |
| 758 | int log_start(struct passwd *ent_pw, int errfd); |
| 759 | int log_reopen(char *log_file); |
| 760 | void my_syslog(int priority, const char *format, ...); |
| 761 | void set_log_writer(fd_set *set, int *maxfdp); |
| 762 | void check_log_writer(fd_set *set); |
| 763 | void flush_log(void); |
| 764 | |
| 765 | /* option.c */ |
| 766 | void read_opts (int argc, char **argv, char *compile_opts); |
| 767 | char *option_string(unsigned char opt, int *is_ip, int *is_name); |
| 768 | void reread_dhcp(void); |
| 769 | |
| 770 | /* forward.c */ |
| 771 | void reply_query(int fd, int family, time_t now); |
| 772 | void receive_query(struct listener *listen, time_t now); |
| 773 | unsigned char *tcp_request(int confd, time_t now, |
| 774 | struct in_addr local_addr, struct in_addr netmask); |
| 775 | void server_gone(struct server *server); |
| 776 | struct frec *get_new_frec(time_t now, int *wait); |
| 777 | |
| 778 | /* network.c */ |
| 779 | int indextoname(int fd, int index, char *name); |
Lorenzo Colitti | 68eff53 | 2014-08-26 14:06:34 -0700 | [diff] [blame] | 780 | int local_bind(int fd, union mysockaddr *addr, char *intname, uint32_t mark, int is_tcp); |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 781 | int random_sock(int family); |
| 782 | void pre_allocate_sfds(void); |
| 783 | int reload_servers(char *fname); |
San Mehat | 33b3444 | 2010-01-20 10:54:48 -0800 | [diff] [blame] | 784 | #ifdef __ANDROID__ |
| 785 | int set_servers(const char *servers); |
Robert Greenwalt | 41cd7ed | 2012-12-11 12:42:32 -0800 | [diff] [blame] | 786 | void set_interfaces(const char *interfaces); |
San Mehat | 33b3444 | 2010-01-20 10:54:48 -0800 | [diff] [blame] | 787 | #endif |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 788 | void check_servers(void); |
| 789 | int enumerate_interfaces(); |
| 790 | struct listener *create_wildcard_listeners(void); |
| 791 | struct listener *create_bound_listeners(void); |
| 792 | int iface_check(int family, struct all_addr *addr, char *name, int *indexp); |
| 793 | int fix_fd(int fd); |
| 794 | struct in_addr get_ifaddr(char *intr); |
| 795 | |
| 796 | /* dhcp.c */ |
| 797 | #ifdef HAVE_DHCP |
| 798 | void dhcp_init(void); |
| 799 | void dhcp_packet(time_t now); |
| 800 | struct dhcp_context *address_available(struct dhcp_context *context, |
| 801 | struct in_addr addr, |
| 802 | struct dhcp_netid *netids); |
| 803 | struct dhcp_context *narrow_context(struct dhcp_context *context, |
| 804 | struct in_addr taddr, |
| 805 | struct dhcp_netid *netids); |
| 806 | int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context, |
| 807 | struct in_addr *addrp, unsigned char *hwaddr, int hw_len, |
| 808 | struct dhcp_netid *netids, time_t now); |
| 809 | int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type); |
| 810 | struct dhcp_config *find_config(struct dhcp_config *configs, |
| 811 | struct dhcp_context *context, |
| 812 | unsigned char *clid, int clid_len, |
| 813 | unsigned char *hwaddr, int hw_len, |
| 814 | int hw_type, char *hostname); |
| 815 | void dhcp_update_configs(struct dhcp_config *configs); |
| 816 | void dhcp_read_ethers(void); |
| 817 | void check_dhcp_hosts(int fatal); |
| 818 | struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr); |
| 819 | char *strip_hostname(char *hostname); |
| 820 | char *host_from_dns(struct in_addr addr); |
| 821 | char *get_domain(struct in_addr addr); |
| 822 | #endif |
| 823 | |
| 824 | /* lease.c */ |
| 825 | #ifdef HAVE_DHCP |
| 826 | void lease_update_file(time_t now); |
| 827 | void lease_update_dns(); |
| 828 | void lease_init(time_t now); |
| 829 | struct dhcp_lease *lease_allocate(struct in_addr addr); |
| 830 | void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr, |
| 831 | unsigned char *clid, int hw_len, int hw_type, int clid_len); |
| 832 | void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth); |
| 833 | void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now); |
| 834 | void lease_set_interface(struct dhcp_lease *lease, int interface); |
| 835 | struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type, |
| 836 | unsigned char *clid, int clid_len); |
| 837 | struct dhcp_lease *lease_find_by_addr(struct in_addr addr); |
| 838 | void lease_prune(struct dhcp_lease *target, time_t now); |
| 839 | void lease_update_from_configs(void); |
| 840 | int do_script_run(time_t now); |
| 841 | void rerun_scripts(void); |
| 842 | #endif |
| 843 | |
| 844 | /* rfc2131.c */ |
| 845 | #ifdef HAVE_DHCP |
| 846 | size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, |
| 847 | size_t sz, time_t now, int unicast_dest, int *is_inform); |
| 848 | unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, |
| 849 | int clid_len, unsigned char *clid, int *len_out); |
| 850 | #endif |
| 851 | |
| 852 | /* dnsmasq.c */ |
| 853 | #ifdef HAVE_DHCP |
| 854 | int make_icmp_sock(void); |
| 855 | int icmp_ping(struct in_addr addr); |
| 856 | #endif |
| 857 | void send_event(int fd, int event, int data); |
| 858 | void clear_cache_and_reload(time_t now); |
| 859 | |
| 860 | /* netlink.c */ |
| 861 | #ifdef HAVE_LINUX_NETWORK |
| 862 | void netlink_init(void); |
| 863 | void netlink_multicast(void); |
| 864 | #endif |
| 865 | |
| 866 | /* bpf.c */ |
| 867 | #ifdef HAVE_BSD_NETWORK |
| 868 | void init_bpf(void); |
| 869 | void send_via_bpf(struct dhcp_packet *mess, size_t len, |
| 870 | struct in_addr iface_addr, struct ifreq *ifr); |
| 871 | #endif |
| 872 | |
| 873 | /* bpf.c or netlink.c */ |
| 874 | int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)()); |
| 875 | |
| 876 | /* dbus.c */ |
| 877 | #ifdef HAVE_DBUS |
| 878 | char *dbus_init(void); |
| 879 | void check_dbus_listeners(fd_set *rset, fd_set *wset, fd_set *eset); |
| 880 | void set_dbus_listeners(int *maxfdp, fd_set *rset, fd_set *wset, fd_set *eset); |
| 881 | void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname); |
| 882 | #endif |
| 883 | |
| 884 | /* helper.c */ |
| 885 | #if defined(HAVE_DHCP) && !defined(NO_FORK) |
| 886 | int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd); |
| 887 | void helper_write(void); |
| 888 | void queue_script(int action, struct dhcp_lease *lease, |
| 889 | char *hostname, time_t now); |
| 890 | int helper_buf_empty(void); |
| 891 | #endif |
| 892 | |
| 893 | /* tftp.c */ |
| 894 | #ifdef HAVE_TFTP |
| 895 | void tftp_request(struct listener *listen, time_t now); |
| 896 | void check_tftp_listeners(fd_set *rset, time_t now); |
| 897 | #endif |