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 | #include "dnsmasq.h" |
| 18 | |
| 19 | #ifdef HAVE_DHCP |
| 20 | |
| 21 | #define BOOTREQUEST 1 |
| 22 | #define BOOTREPLY 2 |
| 23 | #define DHCP_COOKIE 0x63825363 |
| 24 | |
| 25 | /* The Linux in-kernel DHCP client silently ignores any packet |
| 26 | smaller than this. Sigh........... */ |
| 27 | #define MIN_PACKETSZ 300 |
| 28 | |
| 29 | #define OPTION_PAD 0 |
| 30 | #define OPTION_NETMASK 1 |
| 31 | #define OPTION_ROUTER 3 |
| 32 | #define OPTION_DNSSERVER 6 |
| 33 | #define OPTION_HOSTNAME 12 |
| 34 | #define OPTION_DOMAINNAME 15 |
| 35 | #define OPTION_BROADCAST 28 |
| 36 | #define OPTION_VENDOR_CLASS_OPT 43 |
| 37 | #define OPTION_REQUESTED_IP 50 |
| 38 | #define OPTION_LEASE_TIME 51 |
| 39 | #define OPTION_OVERLOAD 52 |
| 40 | #define OPTION_MESSAGE_TYPE 53 |
| 41 | #define OPTION_SERVER_IDENTIFIER 54 |
| 42 | #define OPTION_REQUESTED_OPTIONS 55 |
| 43 | #define OPTION_MESSAGE 56 |
| 44 | #define OPTION_MAXMESSAGE 57 |
| 45 | #define OPTION_T1 58 |
| 46 | #define OPTION_T2 59 |
| 47 | #define OPTION_VENDOR_ID 60 |
| 48 | #define OPTION_CLIENT_ID 61 |
| 49 | #define OPTION_SNAME 66 |
| 50 | #define OPTION_FILENAME 67 |
| 51 | #define OPTION_USER_CLASS 77 |
| 52 | #define OPTION_CLIENT_FQDN 81 |
| 53 | #define OPTION_AGENT_ID 82 |
| 54 | #define OPTION_ARCH 93 |
| 55 | #define OPTION_PXE_UUID 97 |
| 56 | #define OPTION_SUBNET_SELECT 118 |
| 57 | #define OPTION_END 255 |
| 58 | |
| 59 | #define SUBOPT_CIRCUIT_ID 1 |
| 60 | #define SUBOPT_REMOTE_ID 2 |
| 61 | #define SUBOPT_SUBNET_SELECT 5 /* RFC 3527 */ |
| 62 | #define SUBOPT_SUBSCR_ID 6 /* RFC 3393 */ |
| 63 | #define SUBOPT_SERVER_OR 11 /* RFC 5107 */ |
| 64 | |
| 65 | #define SUBOPT_PXE_BOOT_ITEM 71 /* PXE standard */ |
| 66 | #define SUBOPT_PXE_DISCOVERY 6 |
| 67 | #define SUBOPT_PXE_SERVERS 8 |
| 68 | #define SUBOPT_PXE_MENU 9 |
| 69 | #define SUBOPT_PXE_MENU_PROMPT 10 |
| 70 | |
| 71 | #define DHCPDISCOVER 1 |
| 72 | #define DHCPOFFER 2 |
| 73 | #define DHCPREQUEST 3 |
| 74 | #define DHCPDECLINE 4 |
| 75 | #define DHCPACK 5 |
| 76 | #define DHCPNAK 6 |
| 77 | #define DHCPRELEASE 7 |
| 78 | #define DHCPINFORM 8 |
| 79 | |
| 80 | #define have_config(config, mask) ((config) && ((config)->flags & (mask))) |
| 81 | #define option_len(opt) ((int)(((unsigned char *)(opt))[1])) |
| 82 | #define option_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[2u+(unsigned int)(i)])) |
| 83 | |
| 84 | static int sanitise(unsigned char *opt, char *buf); |
| 85 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback); |
| 86 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt); |
| 87 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val); |
| 88 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, |
| 89 | int opt, char *string, int null_term); |
| 90 | static struct in_addr option_addr(unsigned char *opt); |
| 91 | static struct in_addr option_addr_arr(unsigned char *opt, int offset); |
| 92 | static unsigned int option_uint(unsigned char *opt, int i, int size); |
| 93 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, |
| 94 | int mac_len, char *interface, char *string, u32 xid); |
| 95 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize); |
| 96 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize); |
| 97 | static size_t dhcp_packet_size(struct dhcp_packet *mess, struct dhcp_netid *netid, |
| 98 | unsigned char *agent_id, unsigned char *real_end); |
| 99 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end); |
| 100 | static void do_options(struct dhcp_context *context, |
| 101 | struct dhcp_packet *mess, |
| 102 | unsigned char *real_end, |
| 103 | unsigned char *req_options, |
| 104 | char *hostname, |
| 105 | char *domain, char *config_domain, |
| 106 | struct dhcp_netid *netid, |
| 107 | struct in_addr subnet_addr, |
| 108 | unsigned char fqdn_flags, |
| 109 | int null_term, int pxearch, |
| 110 | unsigned char *uuid); |
| 111 | |
| 112 | |
| 113 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt); |
| 114 | static void do_encap_opts(struct dhcp_opt *opts, int encap, int flag, struct dhcp_packet *mess, unsigned char *end, int null_term); |
| 115 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid); |
| 116 | static int prune_vendor_opts(struct dhcp_netid *netid); |
| 117 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid); |
| 118 | struct dhcp_boot *find_boot(struct dhcp_netid *netid); |
| 119 | |
| 120 | |
| 121 | size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, |
| 122 | size_t sz, time_t now, int unicast_dest, int *is_inform) |
| 123 | { |
| 124 | unsigned char *opt, *clid = NULL; |
| 125 | struct dhcp_lease *ltmp, *lease = NULL; |
| 126 | struct dhcp_vendor *vendor; |
| 127 | struct dhcp_mac *mac; |
| 128 | struct dhcp_netid_list *id_list; |
| 129 | int clid_len = 0, ignore = 0, do_classes = 0, selecting = 0, pxearch = -1; |
| 130 | struct dhcp_packet *mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
| 131 | unsigned char *end = (unsigned char *)(mess + 1); |
| 132 | unsigned char *real_end = (unsigned char *)(mess + 1); |
| 133 | char *hostname = NULL, *offer_hostname = NULL, *client_hostname = NULL, *domain = NULL; |
| 134 | int hostname_auth = 0, borken_opt = 0; |
| 135 | unsigned char *req_options = NULL; |
| 136 | char *message = NULL; |
| 137 | unsigned int time; |
| 138 | struct dhcp_config *config; |
| 139 | struct dhcp_netid *netid; |
| 140 | struct in_addr subnet_addr, fallback, override; |
| 141 | unsigned short fuzz = 0; |
| 142 | unsigned int mess_type = 0; |
| 143 | unsigned char fqdn_flags = 0; |
| 144 | unsigned char *agent_id = NULL, *uuid = NULL; |
| 145 | unsigned char *emac = NULL; |
| 146 | int emac_len = 0; |
| 147 | struct dhcp_netid known_id, iface_id; |
| 148 | struct dhcp_opt *o; |
| 149 | unsigned char pxe_uuid[17]; |
| 150 | |
| 151 | subnet_addr.s_addr = override.s_addr = 0; |
| 152 | |
| 153 | /* set tag with name == interface */ |
| 154 | iface_id.net = iface_name; |
| 155 | iface_id.next = NULL; |
| 156 | netid = &iface_id; |
| 157 | |
| 158 | if (mess->op != BOOTREQUEST || mess->hlen > DHCP_CHADDR_MAX) |
| 159 | return 0; |
| 160 | |
| 161 | if (mess->htype == 0 && mess->hlen != 0) |
| 162 | return 0; |
| 163 | |
| 164 | /* check for DHCP rather than BOOTP */ |
| 165 | if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE, 1))) |
| 166 | { |
| 167 | mess_type = option_uint(opt, 0, 1); |
| 168 | |
| 169 | /* only insist on a cookie for DHCP. */ |
| 170 | if (*((u32 *)&mess->options) != htonl(DHCP_COOKIE)) |
| 171 | return 0; |
| 172 | |
| 173 | /* two things to note here: expand_buf may move the packet, |
| 174 | so reassign mess from daemon->packet. Also, the size |
| 175 | sent includes the IP and UDP headers, hence the magic "-28" */ |
| 176 | if ((opt = option_find(mess, sz, OPTION_MAXMESSAGE, 2))) |
| 177 | { |
| 178 | size_t size = (size_t)option_uint(opt, 0, 2) - 28; |
| 179 | |
| 180 | if (size > DHCP_PACKET_MAX) |
| 181 | size = DHCP_PACKET_MAX; |
| 182 | else if (size < sizeof(struct dhcp_packet)) |
| 183 | size = sizeof(struct dhcp_packet); |
| 184 | |
| 185 | if (expand_buf(&daemon->dhcp_packet, size)) |
| 186 | { |
| 187 | mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
| 188 | real_end = end = ((unsigned char *)mess) + size; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /* Some buggy clients set ciaddr when they shouldn't, so clear that here since |
| 193 | it can affect the context-determination code. */ |
| 194 | if ((option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ) || mess_type == DHCPDISCOVER)) |
| 195 | mess->ciaddr.s_addr = 0; |
| 196 | |
| 197 | if ((opt = option_find(mess, sz, OPTION_AGENT_ID, 1))) |
| 198 | { |
| 199 | /* Any agent-id needs to be copied back out, verbatim, as the last option |
| 200 | in the packet. Here, we shift it to the very end of the buffer, if it doesn't |
| 201 | get overwritten, then it will be shuffled back at the end of processing. |
| 202 | Note that the incoming options must not be overwritten here, so there has to |
| 203 | be enough free space at the end of the packet to copy the option. */ |
| 204 | unsigned char *sopt; |
| 205 | unsigned int total = option_len(opt) + 2; |
| 206 | unsigned char *last_opt = option_find(mess, sz, OPTION_END, 0); |
| 207 | if (last_opt && last_opt < end - total) |
| 208 | { |
| 209 | end -= total; |
| 210 | agent_id = end; |
| 211 | memcpy(agent_id, opt, total); |
| 212 | } |
| 213 | |
| 214 | /* look for RFC3527 Link selection sub-option */ |
| 215 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SUBNET_SELECT, INADDRSZ))) |
| 216 | subnet_addr = option_addr(sopt); |
| 217 | |
| 218 | /* look for RFC5107 server-identifier-override */ |
| 219 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SERVER_OR, INADDRSZ))) |
| 220 | override = option_addr(sopt); |
| 221 | |
| 222 | /* if a circuit-id or remote-is option is provided, exact-match to options. */ |
| 223 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) |
| 224 | { |
| 225 | int search; |
| 226 | |
| 227 | if (vendor->match_type == MATCH_CIRCUIT) |
| 228 | search = SUBOPT_CIRCUIT_ID; |
| 229 | else if (vendor->match_type == MATCH_REMOTE) |
| 230 | search = SUBOPT_REMOTE_ID; |
| 231 | else if (vendor->match_type == MATCH_SUBSCRIBER) |
| 232 | search = SUBOPT_SUBSCR_ID; |
| 233 | else |
| 234 | continue; |
| 235 | |
| 236 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), search, 1)) && |
| 237 | vendor->len == option_len(sopt) && |
| 238 | memcmp(option_ptr(sopt, 0), vendor->data, vendor->len) == 0) |
| 239 | { |
| 240 | vendor->netid.next = netid; |
| 241 | netid = &vendor->netid; |
| 242 | break; |
| 243 | } |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /* Check for RFC3011 subnet selector - only if RFC3527 one not present */ |
| 248 | if (subnet_addr.s_addr == 0 && (opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ))) |
| 249 | subnet_addr = option_addr(opt); |
| 250 | |
| 251 | /* If there is no client identifier option, use the hardware address */ |
| 252 | if ((opt = option_find(mess, sz, OPTION_CLIENT_ID, 1))) |
| 253 | { |
| 254 | clid_len = option_len(opt); |
| 255 | clid = option_ptr(opt, 0); |
| 256 | } |
| 257 | |
| 258 | /* do we have a lease in store? */ |
| 259 | lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, clid, clid_len); |
| 260 | |
| 261 | /* If this request is missing a clid, but we've seen one before, |
| 262 | use it again for option matching etc. */ |
| 263 | if (lease && !clid && lease->clid) |
| 264 | { |
| 265 | clid_len = lease->clid_len; |
| 266 | clid = lease->clid; |
| 267 | } |
| 268 | |
| 269 | /* find mac to use for logging and hashing */ |
| 270 | emac = extended_hwaddr(mess->htype, mess->hlen, mess->chaddr, clid_len, clid, &emac_len); |
| 271 | } |
| 272 | |
| 273 | for (mac = daemon->dhcp_macs; mac; mac = mac->next) |
| 274 | if (mac->hwaddr_len == mess->hlen && |
| 275 | (mac->hwaddr_type == mess->htype || mac->hwaddr_type == 0) && |
| 276 | memcmp_masked(mac->hwaddr, mess->chaddr, mess->hlen, mac->mask)) |
| 277 | { |
| 278 | mac->netid.next = netid; |
| 279 | netid = &mac->netid; |
| 280 | } |
| 281 | |
| 282 | /* Determine network for this packet. Our caller will have already linked all the |
| 283 | contexts which match the addresses of the receiving interface but if the |
| 284 | machine has an address already, or came via a relay, or we have a subnet selector, |
| 285 | we search again. If we don't have have a giaddr or explicit subnet selector, |
| 286 | use the ciaddr. This is necessary because a machine which got a lease via a |
| 287 | relay won't use the relay to renew. If matching a ciaddr fails but we have a context |
| 288 | from the physical network, continue using that to allow correct DHCPNAK generation later. */ |
| 289 | if (mess->giaddr.s_addr || subnet_addr.s_addr || mess->ciaddr.s_addr) |
| 290 | { |
| 291 | struct dhcp_context *context_tmp, *context_new = NULL; |
| 292 | struct in_addr addr; |
| 293 | int force = 0; |
| 294 | |
| 295 | if (subnet_addr.s_addr) |
| 296 | { |
| 297 | addr = subnet_addr; |
| 298 | force = 1; |
| 299 | } |
| 300 | else if (mess->giaddr.s_addr) |
| 301 | { |
| 302 | addr = mess->giaddr; |
| 303 | force = 1; |
| 304 | } |
| 305 | else |
| 306 | { |
| 307 | /* If ciaddr is in the hardware derived set of contexts, leave that unchanged */ |
| 308 | addr = mess->ciaddr; |
| 309 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) |
| 310 | if (context_tmp->netmask.s_addr && |
| 311 | is_same_net(addr, context_tmp->start, context_tmp->netmask) && |
| 312 | is_same_net(addr, context_tmp->end, context_tmp->netmask)) |
| 313 | { |
| 314 | context_new = context; |
| 315 | break; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | if (!context_new) |
| 320 | for (context_tmp = daemon->dhcp; context_tmp; context_tmp = context_tmp->next) |
| 321 | if (context_tmp->netmask.s_addr && |
| 322 | is_same_net(addr, context_tmp->start, context_tmp->netmask) && |
| 323 | is_same_net(addr, context_tmp->end, context_tmp->netmask)) |
| 324 | { |
| 325 | context_tmp->current = context_new; |
| 326 | context_new = context_tmp; |
| 327 | } |
| 328 | |
| 329 | if (context_new || force) |
| 330 | context = context_new; |
| 331 | |
| 332 | } |
| 333 | |
| 334 | if (!context) |
| 335 | { |
Robert Greenwalt | b452a63 | 2010-02-24 17:42:07 -0800 | [diff] [blame] | 336 | // my_syslog(MS_DHCP | LOG_WARNING, _("no address range available for DHCP request %s %s"), |
| 337 | // subnet_addr.s_addr ? _("with subnet selector") : _("via"), |
| 338 | // subnet_addr.s_addr ? inet_ntoa(subnet_addr) : (mess->giaddr.s_addr ? inet_ntoa(mess->giaddr) : iface_name)); |
San Mehat | ffd6872 | 2010-01-20 09:56:15 -0800 | [diff] [blame] | 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | /* keep _a_ local address available. */ |
| 343 | fallback = context->local; |
| 344 | |
| 345 | if (daemon->options & OPT_LOG_OPTS) |
| 346 | { |
| 347 | struct dhcp_context *context_tmp; |
| 348 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) |
| 349 | { |
| 350 | strcpy(daemon->namebuff, inet_ntoa(context_tmp->start)); |
| 351 | if (context_tmp->flags & (CONTEXT_STATIC | CONTEXT_PROXY)) |
| 352 | my_syslog(MS_DHCP | LOG_INFO, _("%u Available DHCP subnet: %s/%s"), |
| 353 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->netmask)); |
| 354 | else |
| 355 | my_syslog(MS_DHCP | LOG_INFO, _("%u Available DHCP range: %s -- %s"), |
| 356 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->end)); |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | mess->op = BOOTREPLY; |
| 361 | |
| 362 | config = find_config(daemon->dhcp_conf, context, clid, clid_len, |
| 363 | mess->chaddr, mess->hlen, mess->htype, NULL); |
| 364 | |
| 365 | /* set "known" tag for known hosts */ |
| 366 | if (config) |
| 367 | { |
| 368 | known_id.net = "known"; |
| 369 | known_id.next = netid; |
| 370 | netid = &known_id; |
| 371 | } |
| 372 | |
| 373 | if (mess_type == 0) |
| 374 | { |
| 375 | /* BOOTP request */ |
| 376 | struct dhcp_netid id, bootp_id; |
| 377 | struct in_addr *logaddr = NULL; |
| 378 | |
| 379 | /* must have a MAC addr for bootp */ |
| 380 | if (mess->htype == 0 || mess->hlen == 0 || (context->flags & CONTEXT_PROXY)) |
| 381 | return 0; |
| 382 | |
| 383 | if (have_config(config, CONFIG_DISABLE)) |
| 384 | message = _("disabled"); |
| 385 | |
| 386 | end = mess->options + 64; /* BOOTP vend area is only 64 bytes */ |
| 387 | |
| 388 | if (have_config(config, CONFIG_NAME)) |
| 389 | { |
| 390 | hostname = config->hostname; |
| 391 | domain = config->domain; |
| 392 | } |
| 393 | |
| 394 | if (have_config(config, CONFIG_NETID)) |
| 395 | { |
| 396 | config->netid.next = netid; |
| 397 | netid = &config->netid; |
| 398 | } |
| 399 | |
| 400 | /* Match incoming filename field as a netid. */ |
| 401 | if (mess->file[0]) |
| 402 | { |
| 403 | memcpy(daemon->dhcp_buff2, mess->file, sizeof(mess->file)); |
| 404 | daemon->dhcp_buff2[sizeof(mess->file) + 1] = 0; /* ensure zero term. */ |
| 405 | id.net = (char *)daemon->dhcp_buff2; |
| 406 | id.next = netid; |
| 407 | netid = &id; |
| 408 | } |
| 409 | |
| 410 | /* Add "bootp" as a tag to allow different options, address ranges etc |
| 411 | for BOOTP clients */ |
| 412 | bootp_id.net = "bootp"; |
| 413 | bootp_id.next = netid; |
| 414 | netid = &bootp_id; |
| 415 | |
| 416 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) |
| 417 | if (match_netid(id_list->list, netid, 0)) |
| 418 | message = _("ignored"); |
| 419 | |
| 420 | if (!message) |
| 421 | { |
| 422 | int nailed = 0; |
| 423 | |
| 424 | if (have_config(config, CONFIG_ADDR)) |
| 425 | { |
| 426 | nailed = 1; |
| 427 | logaddr = &config->addr; |
| 428 | mess->yiaddr = config->addr; |
| 429 | if ((lease = lease_find_by_addr(config->addr)) && |
| 430 | (lease->hwaddr_len != mess->hlen || |
| 431 | lease->hwaddr_type != mess->htype || |
| 432 | memcmp(lease->hwaddr, mess->chaddr, lease->hwaddr_len) != 0)) |
| 433 | message = _("address in use"); |
| 434 | } |
| 435 | else |
| 436 | { |
| 437 | if (!(lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, NULL, 0)) || |
| 438 | !address_available(context, lease->addr, netid)) |
| 439 | { |
| 440 | if (lease) |
| 441 | { |
| 442 | /* lease exists, wrong network. */ |
| 443 | lease_prune(lease, now); |
| 444 | lease = NULL; |
| 445 | } |
| 446 | if (!address_allocate(context, &mess->yiaddr, mess->chaddr, mess->hlen, netid, now)) |
| 447 | message = _("no address available"); |
| 448 | } |
| 449 | else |
| 450 | mess->yiaddr = lease->addr; |
| 451 | } |
| 452 | |
| 453 | if (!message && !(context = narrow_context(context, mess->yiaddr, netid))) |
| 454 | message = _("wrong network"); |
| 455 | else if (context->netid.net) |
| 456 | { |
| 457 | context->netid.next = netid; |
| 458 | netid = &context->netid; |
| 459 | } |
| 460 | |
| 461 | if (!message && !nailed) |
| 462 | { |
| 463 | for (id_list = daemon->bootp_dynamic; id_list; id_list = id_list->next) |
| 464 | if ((!id_list->list) || match_netid(id_list->list, netid, 0)) |
| 465 | break; |
| 466 | if (!id_list) |
| 467 | message = _("no address configured"); |
| 468 | } |
| 469 | |
| 470 | if (!message && |
| 471 | !lease && |
| 472 | (!(lease = lease_allocate(mess->yiaddr)))) |
| 473 | message = _("no leases left"); |
| 474 | |
| 475 | if (!message) |
| 476 | { |
| 477 | logaddr = &mess->yiaddr; |
| 478 | |
| 479 | lease_set_hwaddr(lease, mess->chaddr, NULL, mess->hlen, mess->htype, 0); |
| 480 | if (hostname) |
| 481 | lease_set_hostname(lease, hostname, 1); |
| 482 | /* infinite lease unless nailed in dhcp-host line. */ |
| 483 | lease_set_expires(lease, |
| 484 | have_config(config, CONFIG_TIME) ? config->lease_time : 0xffffffff, |
| 485 | now); |
| 486 | lease_set_interface(lease, int_index); |
| 487 | |
| 488 | clear_packet(mess, end); |
| 489 | do_options(context, mess, end, NULL, hostname, get_domain(mess->yiaddr), |
| 490 | domain, netid, subnet_addr, 0, 0, 0, NULL); |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | log_packet("BOOTP", logaddr, mess->chaddr, mess->hlen, iface_name, message, mess->xid); |
| 495 | |
| 496 | return message ? 0 : dhcp_packet_size(mess, netid, agent_id, real_end); |
| 497 | } |
| 498 | |
| 499 | if ((opt = option_find(mess, sz, OPTION_CLIENT_FQDN, 4))) |
| 500 | { |
| 501 | /* http://tools.ietf.org/wg/dhc/draft-ietf-dhc-fqdn-option/draft-ietf-dhc-fqdn-option-10.txt */ |
| 502 | int len = option_len(opt); |
| 503 | char *pq = daemon->dhcp_buff; |
| 504 | unsigned char *pp, *op = option_ptr(opt, 0); |
| 505 | |
| 506 | fqdn_flags = *op; |
| 507 | len -= 3; |
| 508 | op += 3; |
| 509 | pp = op; |
| 510 | |
| 511 | /* Always force update, since the client has no way to do it itself. */ |
| 512 | if (!(fqdn_flags & 0x01)) |
| 513 | fqdn_flags |= 0x02; |
| 514 | |
| 515 | fqdn_flags &= ~0x08; |
| 516 | fqdn_flags |= 0x01; |
| 517 | |
| 518 | if (fqdn_flags & 0x04) |
| 519 | while (*op != 0 && ((op + (*op) + 1) - pp) < len) |
| 520 | { |
| 521 | memcpy(pq, op+1, *op); |
| 522 | pq += *op; |
| 523 | op += (*op)+1; |
| 524 | *(pq++) = '.'; |
| 525 | } |
| 526 | else |
| 527 | { |
| 528 | memcpy(pq, op, len); |
| 529 | if (len > 0 && op[len-1] == 0) |
| 530 | borken_opt = 1; |
| 531 | pq += len + 1; |
| 532 | } |
| 533 | |
| 534 | if (pq != daemon->dhcp_buff) |
| 535 | pq--; |
| 536 | |
| 537 | *pq = 0; |
| 538 | |
| 539 | if (legal_hostname(daemon->dhcp_buff)) |
| 540 | offer_hostname = client_hostname = daemon->dhcp_buff; |
| 541 | } |
| 542 | else if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1))) |
| 543 | { |
| 544 | int len = option_len(opt); |
| 545 | memcpy(daemon->dhcp_buff, option_ptr(opt, 0), len); |
| 546 | /* Microsoft clients are broken, and need zero-terminated strings |
| 547 | in options. We detect this state here, and do the same in |
| 548 | any options we send */ |
| 549 | if (len > 0 && daemon->dhcp_buff[len-1] == 0) |
| 550 | borken_opt = 1; |
| 551 | else |
| 552 | daemon->dhcp_buff[len] = 0; |
| 553 | if (legal_hostname(daemon->dhcp_buff)) |
| 554 | client_hostname = daemon->dhcp_buff; |
| 555 | } |
| 556 | |
| 557 | if (client_hostname && daemon->options & OPT_LOG_OPTS) |
| 558 | my_syslog(MS_DHCP | LOG_INFO, _("%u client provides name: %s"), ntohl(mess->xid), client_hostname); |
| 559 | |
| 560 | if (have_config(config, CONFIG_NAME)) |
| 561 | { |
| 562 | hostname = config->hostname; |
| 563 | domain = config->domain; |
| 564 | hostname_auth = 1; |
| 565 | /* be careful not to send an OFFER with a hostname not matching the DISCOVER. */ |
| 566 | if (fqdn_flags != 0 || !client_hostname || hostname_isequal(hostname, client_hostname)) |
| 567 | offer_hostname = hostname; |
| 568 | } |
| 569 | else if (client_hostname) |
| 570 | { |
| 571 | domain = strip_hostname(client_hostname); |
| 572 | |
| 573 | if (strlen(client_hostname) != 0) |
| 574 | { |
| 575 | hostname = client_hostname; |
| 576 | if (!config) |
| 577 | { |
| 578 | /* Search again now we have a hostname. |
| 579 | Only accept configs without CLID and HWADDR here, (they won't match) |
| 580 | to avoid impersonation by name. */ |
| 581 | struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0, |
| 582 | mess->chaddr, mess->hlen, |
| 583 | mess->htype, hostname); |
| 584 | if (new && !have_config(new, CONFIG_CLID) && !new->hwaddr) |
| 585 | { |
| 586 | config = new; |
| 587 | /* set "known" tag for known hosts */ |
| 588 | known_id.net = "known"; |
| 589 | known_id.next = netid; |
| 590 | netid = &known_id; |
| 591 | } |
| 592 | } |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | if (have_config(config, CONFIG_NETID)) |
| 597 | { |
| 598 | config->netid.next = netid; |
| 599 | netid = &config->netid; |
| 600 | } |
| 601 | |
| 602 | /* dhcp-match. If we have hex-and-wildcards, look for a left-anchored match. |
| 603 | Otherwise assume the option is an array, and look for a matching element. |
| 604 | If no data given, existance of the option is enough. */ |
| 605 | for (o = daemon->dhcp_match; o; o = o->next) |
| 606 | { |
| 607 | int i, matched = 0; |
| 608 | |
| 609 | if (!(opt = option_find(mess, sz, o->opt, 1)) || |
| 610 | o->len > option_len(opt)) |
| 611 | continue; |
| 612 | |
| 613 | if (o->len == 0) |
| 614 | matched = 1; |
| 615 | else if (o->flags & DHOPT_HEX) |
| 616 | { |
| 617 | if (memcmp_masked(o->val, option_ptr(opt, 0), o->len, o->u.wildcard_mask)) |
| 618 | matched = 1; |
| 619 | } |
| 620 | else |
| 621 | for (i = 0; i <= (option_len(opt) - o->len); ) |
| 622 | { |
| 623 | if (memcmp(o->val, option_ptr(opt, i), o->len) == 0) |
| 624 | { |
| 625 | matched = 1; |
| 626 | break; |
| 627 | } |
| 628 | |
| 629 | if (o->flags & DHOPT_STRING) |
| 630 | i++; |
| 631 | else |
| 632 | i += o->len; |
| 633 | } |
| 634 | |
| 635 | if (matched) |
| 636 | { |
| 637 | o->netid->next = netid; |
| 638 | netid = o->netid; |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | /* user-class options are, according to RFC3004, supposed to contain |
| 643 | a set of counted strings. Here we check that this is so (by seeing |
| 644 | if the counts are consistent with the overall option length) and if |
| 645 | so zero the counts so that we don't get spurious matches between |
| 646 | the vendor string and the counts. If the lengths don't add up, we |
| 647 | assume that the option is a single string and non RFC3004 compliant |
| 648 | and just do the substring match. dhclient provides these broken options. |
| 649 | The code, later, which sends user-class data to the lease-change script |
| 650 | relies on the transformation done here. |
| 651 | */ |
| 652 | |
| 653 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) |
| 654 | { |
| 655 | unsigned char *ucp = option_ptr(opt, 0); |
| 656 | int tmp, j; |
| 657 | for (j = 0; j < option_len(opt); j += ucp[j] + 1); |
| 658 | if (j == option_len(opt)) |
| 659 | for (j = 0; j < option_len(opt); j = tmp) |
| 660 | { |
| 661 | tmp = j + ucp[j] + 1; |
| 662 | ucp[j] = 0; |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) |
| 667 | { |
| 668 | int mopt; |
| 669 | |
| 670 | if (vendor->match_type == MATCH_VENDOR) |
| 671 | mopt = OPTION_VENDOR_ID; |
| 672 | else if (vendor->match_type == MATCH_USER) |
| 673 | mopt = OPTION_USER_CLASS; |
| 674 | else |
| 675 | continue; |
| 676 | |
| 677 | if ((opt = option_find(mess, sz, mopt, 1))) |
| 678 | { |
| 679 | int i; |
| 680 | for (i = 0; i <= (option_len(opt) - vendor->len); i++) |
| 681 | if (memcmp(vendor->data, option_ptr(opt, i), vendor->len) == 0) |
| 682 | { |
| 683 | vendor->netid.next = netid; |
| 684 | netid = &vendor->netid; |
| 685 | break; |
| 686 | } |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | /* mark vendor-encapsulated options which match the client-supplied vendor class */ |
| 691 | match_vendor_opts(option_find(mess, sz, OPTION_VENDOR_ID, 1), daemon->dhcp_opts); |
| 692 | |
| 693 | if (daemon->options & OPT_LOG_OPTS) |
| 694 | { |
| 695 | if (sanitise(option_find(mess, sz, OPTION_VENDOR_ID, 1), daemon->namebuff)) |
| 696 | my_syslog(MS_DHCP | LOG_INFO, _("%u Vendor class: %s"), ntohl(mess->xid), daemon->namebuff); |
| 697 | if (sanitise(option_find(mess, sz, OPTION_USER_CLASS, 1), daemon->namebuff)) |
| 698 | my_syslog(MS_DHCP | LOG_INFO, _("%u User class: %s"), ntohl(mess->xid), daemon->namebuff); |
| 699 | } |
| 700 | |
| 701 | /* if all the netids in the ignore list are present, ignore this client */ |
| 702 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) |
| 703 | if (match_netid(id_list->list, netid, 0)) |
| 704 | ignore = 1; |
| 705 | |
| 706 | /* Can have setting to ignore the client ID for a particular MAC address or hostname */ |
| 707 | if (have_config(config, CONFIG_NOCLID)) |
| 708 | clid = NULL; |
| 709 | |
| 710 | /* Check if client is PXE client. */ |
| 711 | if (daemon->enable_pxe && |
| 712 | (opt = option_find(mess, sz, OPTION_VENDOR_ID, 9)) && |
| 713 | strncmp(option_ptr(opt, 0), "PXEClient", 9) == 0) |
| 714 | { |
| 715 | if ((opt = option_find(mess, sz, OPTION_PXE_UUID, 17))) |
| 716 | { |
| 717 | memcpy(pxe_uuid, option_ptr(opt, 0), 17); |
| 718 | uuid = pxe_uuid; |
| 719 | } |
| 720 | |
| 721 | /* Check if this is really a PXE bootserver request, and handle specially if so. */ |
| 722 | if ((mess_type == DHCPREQUEST || mess_type == DHCPINFORM) && |
| 723 | (opt = option_find(mess, sz, OPTION_VENDOR_CLASS_OPT, 1)) && |
| 724 | (opt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_PXE_BOOT_ITEM, 4))) |
| 725 | { |
| 726 | struct pxe_service *service; |
| 727 | int type = option_uint(opt, 0, 2); |
| 728 | int layer = option_uint(opt, 2, 2); |
| 729 | unsigned char save71[4]; |
| 730 | struct dhcp_opt opt71; |
| 731 | |
| 732 | if (ignore) |
| 733 | return 0; |
| 734 | |
| 735 | if (layer & 0x8000) |
| 736 | { |
| 737 | my_syslog(MS_DHCP | LOG_ERR, _("PXE BIS not supported")); |
| 738 | return 0; |
| 739 | } |
| 740 | |
| 741 | memcpy(save71, option_ptr(opt, 0), 4); |
| 742 | |
| 743 | for (service = daemon->pxe_services; service; service = service->next) |
| 744 | if (service->type == type) |
| 745 | break; |
| 746 | |
| 747 | if (!service || !service->basename) |
| 748 | return 0; |
| 749 | |
| 750 | clear_packet(mess, end); |
| 751 | |
| 752 | mess->yiaddr = mess->ciaddr; |
| 753 | mess->ciaddr.s_addr = 0; |
| 754 | if (service->server.s_addr != 0) |
| 755 | mess->siaddr = service->server; |
| 756 | else |
| 757 | mess->siaddr = context->local; |
| 758 | |
| 759 | snprintf((char *)mess->file, sizeof(mess->file), "%s.%d", service->basename, layer); |
| 760 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
| 761 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); |
| 762 | pxe_misc(mess, end, uuid); |
| 763 | |
| 764 | prune_vendor_opts(netid); |
| 765 | opt71.val = save71; |
| 766 | opt71.opt = SUBOPT_PXE_BOOT_ITEM; |
| 767 | opt71.len = 4; |
| 768 | opt71.flags = DHOPT_VENDOR_MATCH; |
| 769 | opt71.netid = NULL; |
| 770 | opt71.next = daemon->dhcp_opts; |
| 771 | do_encap_opts(&opt71, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); |
| 772 | |
| 773 | log_packet("PXE", &mess->yiaddr, emac, emac_len, iface_name, (char *)mess->file, mess->xid); |
| 774 | return dhcp_packet_size(mess, netid, agent_id, real_end); |
| 775 | } |
| 776 | |
| 777 | if ((opt = option_find(mess, sz, OPTION_ARCH, 2))) |
| 778 | { |
| 779 | pxearch = option_uint(opt, 0, 2); |
| 780 | |
| 781 | /* proxy DHCP here. The DHCPREQUEST stuff is for gPXE */ |
| 782 | if ((mess_type == DHCPDISCOVER || mess_type == DHCPREQUEST) && |
| 783 | (context->flags & CONTEXT_PROXY)) |
| 784 | { |
| 785 | struct dhcp_boot *boot = find_boot(netid); |
| 786 | |
| 787 | mess->yiaddr.s_addr = 0; |
| 788 | if (mess_type == DHCPDISCOVER || mess->ciaddr.s_addr == 0) |
| 789 | { |
| 790 | mess->ciaddr.s_addr = 0; |
| 791 | mess->flags |= htons(0x8000); /* broadcast */ |
| 792 | } |
| 793 | |
| 794 | clear_packet(mess, end); |
| 795 | |
| 796 | /* Provide the bootfile here, for gPXE, and in case we have no menu items |
| 797 | and set discovery_control = 8 */ |
| 798 | if (boot) |
| 799 | { |
| 800 | if (boot->next_server.s_addr) |
| 801 | mess->siaddr = boot->next_server; |
| 802 | |
| 803 | if (boot->file) |
| 804 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); |
| 805 | } |
| 806 | |
| 807 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, |
| 808 | mess_type == DHCPDISCOVER ? DHCPOFFER : DHCPACK); |
| 809 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); |
| 810 | pxe_misc(mess, end, uuid); |
| 811 | prune_vendor_opts(netid); |
| 812 | do_encap_opts(pxe_opts(pxearch, netid), OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); |
| 813 | |
| 814 | log_packet("PXE", NULL, emac, emac_len, iface_name, ignore ? "proxy" : "proxy-ignored", mess->xid); |
| 815 | return ignore ? 0 : dhcp_packet_size(mess, netid, agent_id, real_end); |
| 816 | } |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | /* if we're just a proxy server, go no further */ |
| 821 | if (context->flags & CONTEXT_PROXY) |
| 822 | return 0; |
| 823 | |
| 824 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0))) |
| 825 | { |
| 826 | req_options = (unsigned char *)daemon->dhcp_buff2; |
| 827 | memcpy(req_options, option_ptr(opt, 0), option_len(opt)); |
| 828 | req_options[option_len(opt)] = OPTION_END; |
| 829 | } |
| 830 | |
| 831 | switch (mess_type) |
| 832 | { |
| 833 | case DHCPDECLINE: |
| 834 | if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
| 835 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
| 836 | return 0; |
| 837 | |
| 838 | /* sanitise any message. Paranoid? Moi? */ |
| 839 | sanitise(option_find(mess, sz, OPTION_MESSAGE, 1), daemon->dhcp_buff); |
| 840 | |
| 841 | if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
| 842 | return 0; |
| 843 | |
| 844 | log_packet("DHCPDECLINE", option_ptr(opt, 0), emac, emac_len, iface_name, daemon->dhcp_buff, mess->xid); |
| 845 | |
| 846 | if (lease && lease->addr.s_addr == option_addr(opt).s_addr) |
| 847 | lease_prune(lease, now); |
| 848 | |
| 849 | if (have_config(config, CONFIG_ADDR) && |
| 850 | config->addr.s_addr == option_addr(opt).s_addr) |
| 851 | { |
| 852 | prettyprint_time(daemon->dhcp_buff, DECLINE_BACKOFF); |
| 853 | my_syslog(MS_DHCP | LOG_WARNING, _("disabling DHCP static address %s for %s"), |
| 854 | inet_ntoa(config->addr), daemon->dhcp_buff); |
| 855 | config->flags |= CONFIG_DECLINED; |
| 856 | config->decline_time = now; |
| 857 | } |
| 858 | else |
| 859 | /* make sure this host gets a different address next time. */ |
| 860 | for (; context; context = context->current) |
| 861 | context->addr_epoch++; |
| 862 | |
| 863 | return 0; |
| 864 | |
| 865 | case DHCPRELEASE: |
| 866 | if (!(context = narrow_context(context, mess->ciaddr, netid)) || |
| 867 | !(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
| 868 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
| 869 | return 0; |
| 870 | |
| 871 | if (lease && lease->addr.s_addr == mess->ciaddr.s_addr) |
| 872 | lease_prune(lease, now); |
| 873 | else |
| 874 | message = _("unknown lease"); |
| 875 | |
| 876 | log_packet("DHCPRELEASE", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
| 877 | |
| 878 | return 0; |
| 879 | |
| 880 | case DHCPDISCOVER: |
| 881 | if (ignore || have_config(config, CONFIG_DISABLE)) |
| 882 | { |
| 883 | message = _("ignored"); |
| 884 | opt = NULL; |
| 885 | } |
| 886 | else |
| 887 | { |
| 888 | struct in_addr addr, conf; |
| 889 | |
| 890 | addr.s_addr = conf.s_addr = 0; |
| 891 | |
| 892 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
| 893 | addr = option_addr(opt); |
| 894 | |
| 895 | if (have_config(config, CONFIG_ADDR)) |
| 896 | { |
| 897 | char *addrs = inet_ntoa(config->addr); |
| 898 | |
| 899 | if ((ltmp = lease_find_by_addr(config->addr)) && |
| 900 | ltmp != lease && |
| 901 | !config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) |
| 902 | { |
| 903 | int len; |
| 904 | unsigned char *mac = extended_hwaddr(ltmp->hwaddr_type, ltmp->hwaddr_len, |
| 905 | ltmp->hwaddr, ltmp->clid_len, ltmp->clid, &len); |
| 906 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is leased to %s"), |
| 907 | addrs, print_mac(daemon->namebuff, mac, len)); |
| 908 | } |
| 909 | else |
| 910 | { |
| 911 | struct dhcp_context *tmp; |
| 912 | for (tmp = context; tmp; tmp = tmp->current) |
| 913 | if (context->router.s_addr == config->addr.s_addr) |
| 914 | break; |
| 915 | if (tmp) |
| 916 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is in use by the server or relay"), addrs); |
| 917 | else if (have_config(config, CONFIG_DECLINED) && |
| 918 | difftime(now, config->decline_time) < (float)DECLINE_BACKOFF) |
| 919 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it was previously declined"), addrs); |
| 920 | else |
| 921 | conf = config->addr; |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | if (conf.s_addr) |
| 926 | mess->yiaddr = conf; |
| 927 | else if (lease && |
| 928 | address_available(context, lease->addr, netid) && |
| 929 | !config_find_by_address(daemon->dhcp_conf, lease->addr)) |
| 930 | mess->yiaddr = lease->addr; |
| 931 | else if (opt && address_available(context, addr, netid) && !lease_find_by_addr(addr) && |
| 932 | !config_find_by_address(daemon->dhcp_conf, addr)) |
| 933 | mess->yiaddr = addr; |
| 934 | else if (emac_len == 0) |
| 935 | message = _("no unique-id"); |
| 936 | else if (!address_allocate(context, &mess->yiaddr, emac, emac_len, netid, now)) |
| 937 | message = _("no address available"); |
| 938 | } |
| 939 | |
| 940 | log_packet("DHCPDISCOVER", opt ? option_ptr(opt, 0) : NULL, emac, emac_len, iface_name, message, mess->xid); |
| 941 | |
| 942 | if (message || !(context = narrow_context(context, mess->yiaddr, netid))) |
| 943 | return 0; |
| 944 | |
| 945 | log_packet("DHCPOFFER" , &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); |
| 946 | |
| 947 | if (context->netid.net) |
| 948 | { |
| 949 | context->netid.next = netid; |
| 950 | netid = &context->netid; |
| 951 | } |
| 952 | |
| 953 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
| 954 | clear_packet(mess, end); |
| 955 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPOFFER); |
| 956 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
| 957 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
| 958 | /* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */ |
| 959 | if (time != 0xffffffff) |
| 960 | { |
| 961 | option_put(mess, end, OPTION_T1, 4, (time/2)); |
| 962 | option_put(mess, end, OPTION_T2, 4, (time*7)/8); |
| 963 | } |
| 964 | do_options(context, mess, end, req_options, offer_hostname, get_domain(mess->yiaddr), |
| 965 | domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid); |
| 966 | |
| 967 | return dhcp_packet_size(mess, netid, agent_id, real_end); |
| 968 | |
| 969 | case DHCPREQUEST: |
| 970 | if (ignore || have_config(config, CONFIG_DISABLE)) |
| 971 | return 0; |
| 972 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
| 973 | { |
| 974 | /* SELECTING or INIT_REBOOT */ |
| 975 | mess->yiaddr = option_addr(opt); |
| 976 | |
| 977 | /* send vendor and user class info for new or recreated lease */ |
| 978 | do_classes = 1; |
| 979 | |
| 980 | if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ))) |
| 981 | { |
| 982 | /* SELECTING */ |
| 983 | selecting = 1; |
| 984 | |
| 985 | if (override.s_addr != 0) |
| 986 | { |
| 987 | if (option_addr(opt).s_addr != override.s_addr) |
| 988 | return 0; |
| 989 | } |
| 990 | else |
| 991 | { |
| 992 | for (; context; context = context->current) |
| 993 | if (context->local.s_addr == option_addr(opt).s_addr) |
| 994 | break; |
| 995 | |
| 996 | if (!context) |
| 997 | { |
| 998 | /* In auth mode, a REQUEST sent to the wrong server |
| 999 | should be faulted, so that the client establishes |
| 1000 | communication with us, otherwise, silently ignore. */ |
| 1001 | if (!(daemon->options & OPT_AUTHORITATIVE)) |
| 1002 | return 0; |
| 1003 | message = _("wrong server-ID"); |
| 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | /* If a lease exists for this host and another address, squash it. */ |
| 1008 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) |
| 1009 | { |
| 1010 | lease_prune(lease, now); |
| 1011 | lease = NULL; |
| 1012 | } |
| 1013 | } |
| 1014 | else |
| 1015 | { |
| 1016 | /* INIT-REBOOT */ |
| 1017 | if (!lease && !(daemon->options & OPT_AUTHORITATIVE)) |
| 1018 | return 0; |
| 1019 | |
| 1020 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) |
| 1021 | { |
| 1022 | message = _("wrong address"); |
| 1023 | /* avoid loops when client brain-dead */ |
| 1024 | lease_prune(lease, now); |
| 1025 | lease = NULL; |
| 1026 | } |
| 1027 | } |
| 1028 | } |
| 1029 | else |
| 1030 | { |
| 1031 | /* RENEWING or REBINDING */ |
| 1032 | /* Check existing lease for this address. |
| 1033 | We allow it to be missing if dhcp-authoritative mode |
| 1034 | as long as we can allocate the lease now - checked below. |
| 1035 | This makes for a smooth recovery from a lost lease DB */ |
| 1036 | if ((lease && mess->ciaddr.s_addr != lease->addr.s_addr) || |
| 1037 | (!lease && !(daemon->options & OPT_AUTHORITATIVE))) |
| 1038 | { |
| 1039 | message = _("lease not found"); |
| 1040 | /* ensure we broadcast NAK */ |
| 1041 | unicast_dest = 0; |
| 1042 | } |
| 1043 | /* desynchronise renewals */ |
| 1044 | fuzz = rand16(); |
| 1045 | mess->yiaddr = mess->ciaddr; |
| 1046 | } |
| 1047 | |
| 1048 | log_packet("DHCPREQUEST", &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); |
| 1049 | |
| 1050 | if (!message) |
| 1051 | { |
| 1052 | struct dhcp_config *addr_config; |
| 1053 | struct dhcp_context *tmp = NULL; |
| 1054 | |
| 1055 | if (have_config(config, CONFIG_ADDR)) |
| 1056 | for (tmp = context; tmp; tmp = tmp->current) |
| 1057 | if (context->router.s_addr == config->addr.s_addr) |
| 1058 | break; |
| 1059 | |
| 1060 | if (!(context = narrow_context(context, mess->yiaddr, netid))) |
| 1061 | { |
| 1062 | /* If a machine moves networks whilst it has a lease, we catch that here. */ |
| 1063 | message = _("wrong network"); |
| 1064 | /* ensure we broadcast NAK */ |
| 1065 | unicast_dest = 0; |
| 1066 | } |
| 1067 | |
| 1068 | /* Check for renewal of a lease which is outside the allowed range. */ |
| 1069 | else if (!address_available(context, mess->yiaddr, netid) && |
| 1070 | (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr)) |
| 1071 | message = _("address not available"); |
| 1072 | |
| 1073 | /* Check if a new static address has been configured. Be very sure that |
| 1074 | when the client does DISCOVER, it will get the static address, otherwise |
| 1075 | an endless protocol loop will ensue. */ |
| 1076 | else if (!tmp && !selecting && |
| 1077 | have_config(config, CONFIG_ADDR) && |
| 1078 | (!have_config(config, CONFIG_DECLINED) || |
| 1079 | difftime(now, config->decline_time) > (float)DECLINE_BACKOFF) && |
| 1080 | config->addr.s_addr != mess->yiaddr.s_addr && |
| 1081 | (!(ltmp = lease_find_by_addr(config->addr)) || ltmp == lease)) |
| 1082 | message = _("static lease available"); |
| 1083 | |
| 1084 | /* Check to see if the address is reserved as a static address for another host */ |
| 1085 | else if ((addr_config = config_find_by_address(daemon->dhcp_conf, mess->yiaddr)) && addr_config != config) |
| 1086 | message = _("address reserved"); |
| 1087 | |
| 1088 | else if (!lease && (ltmp = lease_find_by_addr(mess->yiaddr))) |
| 1089 | { |
| 1090 | /* If a host is configured with more than one MAC address, it's OK to 'nix |
| 1091 | a lease from one of it's MACs to give the address to another. */ |
| 1092 | if (config && config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) |
| 1093 | { |
| 1094 | my_syslog(MS_DHCP | LOG_INFO, _("abandoning lease to %s of %s"), |
| 1095 | print_mac(daemon->namebuff, ltmp->hwaddr, ltmp->hwaddr_len), |
| 1096 | inet_ntoa(ltmp->addr)); |
| 1097 | lease = ltmp; |
| 1098 | } |
| 1099 | else |
| 1100 | message = _("address in use"); |
| 1101 | } |
| 1102 | |
| 1103 | if (!message) |
| 1104 | { |
| 1105 | if (emac_len == 0) |
| 1106 | message = _("no unique-id"); |
| 1107 | |
| 1108 | else if (!lease) |
| 1109 | { |
| 1110 | if ((lease = lease_allocate(mess->yiaddr))) |
| 1111 | do_classes = 1; |
| 1112 | else |
| 1113 | message = _("no leases left"); |
| 1114 | } |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | if (message) |
| 1119 | { |
| 1120 | log_packet("DHCPNAK", &mess->yiaddr, emac, emac_len, iface_name, message, mess->xid); |
| 1121 | |
| 1122 | mess->yiaddr.s_addr = 0; |
| 1123 | clear_packet(mess, end); |
| 1124 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPNAK); |
| 1125 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
| 1126 | option_put_string(mess, end, OPTION_MESSAGE, message, borken_opt); |
| 1127 | /* This fixes a problem with the DHCP spec, broadcasting a NAK to a host on |
| 1128 | a distant subnet which unicast a REQ to us won't work. */ |
| 1129 | if (!unicast_dest || mess->giaddr.s_addr != 0 || |
| 1130 | mess->ciaddr.s_addr == 0 || is_same_net(context->local, mess->ciaddr, context->netmask)) |
| 1131 | { |
| 1132 | mess->flags |= htons(0x8000); /* broadcast */ |
| 1133 | mess->ciaddr.s_addr = 0; |
| 1134 | } |
| 1135 | } |
| 1136 | else |
| 1137 | { |
| 1138 | if (do_classes) |
| 1139 | { |
| 1140 | if (mess->giaddr.s_addr) |
| 1141 | lease->giaddr = mess->giaddr; |
| 1142 | |
| 1143 | lease->changed = 1; |
| 1144 | /* copy user-class and vendor class into new lease, for the script */ |
| 1145 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) |
| 1146 | { |
| 1147 | int len = option_len(opt); |
| 1148 | unsigned char *ucp = option_ptr(opt, 0); |
| 1149 | /* If the user-class option started as counted strings, the first byte will be zero. */ |
| 1150 | if (len != 0 && ucp[0] == 0) |
| 1151 | ucp++, len--; |
| 1152 | free(lease->userclass); |
| 1153 | if ((lease->userclass = whine_malloc(len+1))) |
| 1154 | { |
| 1155 | memcpy(lease->userclass, ucp, len); |
| 1156 | lease->userclass[len] = 0; |
| 1157 | lease->userclass_len = len+1; |
| 1158 | } |
| 1159 | } |
| 1160 | if ((opt = option_find(mess, sz, OPTION_VENDOR_ID, 1))) |
| 1161 | { |
| 1162 | int len = option_len(opt); |
| 1163 | unsigned char *ucp = option_ptr(opt, 0); |
| 1164 | free(lease->vendorclass); |
| 1165 | if ((lease->vendorclass = whine_malloc(len+1))) |
| 1166 | { |
| 1167 | memcpy(lease->vendorclass, ucp, len); |
| 1168 | lease->vendorclass[len] = 0; |
| 1169 | lease->vendorclass_len = len+1; |
| 1170 | } |
| 1171 | } |
| 1172 | if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1))) |
| 1173 | { |
| 1174 | int len = option_len(opt); |
| 1175 | unsigned char *ucp = option_ptr(opt, 0); |
| 1176 | free(lease->supplied_hostname); |
| 1177 | if ((lease->supplied_hostname = whine_malloc(len+1))) |
| 1178 | { |
| 1179 | memcpy(lease->supplied_hostname, ucp, len); |
| 1180 | lease->supplied_hostname[len] = 0; |
| 1181 | lease->supplied_hostname_len = len+1; |
| 1182 | } |
| 1183 | } |
| 1184 | } |
| 1185 | |
| 1186 | if (!hostname_auth && (client_hostname = host_from_dns(mess->yiaddr))) |
| 1187 | { |
| 1188 | hostname = client_hostname; |
| 1189 | hostname_auth = 1; |
| 1190 | } |
| 1191 | |
| 1192 | if (context->netid.net) |
| 1193 | { |
| 1194 | context->netid.next = netid; |
| 1195 | netid = &context->netid; |
| 1196 | } |
| 1197 | |
| 1198 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
| 1199 | lease_set_hwaddr(lease, mess->chaddr, clid, mess->hlen, mess->htype, clid_len); |
| 1200 | |
| 1201 | /* if all the netids in the ignore_name list are present, ignore client-supplied name */ |
| 1202 | if (!hostname_auth) |
| 1203 | { |
| 1204 | for (id_list = daemon->dhcp_ignore_names; id_list; id_list = id_list->next) |
| 1205 | if ((!id_list->list) || match_netid(id_list->list, netid, 0)) |
| 1206 | break; |
| 1207 | if (id_list) |
| 1208 | hostname = NULL; |
| 1209 | } |
| 1210 | if (hostname) |
| 1211 | lease_set_hostname(lease, hostname, hostname_auth); |
| 1212 | |
| 1213 | lease_set_expires(lease, time, now); |
| 1214 | lease_set_interface(lease, int_index); |
| 1215 | |
| 1216 | if (override.s_addr != 0) |
| 1217 | lease->override = override; |
| 1218 | else |
| 1219 | override = lease->override; |
| 1220 | |
| 1221 | log_packet("DHCPACK", &mess->yiaddr, emac, emac_len, iface_name, hostname, mess->xid); |
| 1222 | |
| 1223 | clear_packet(mess, end); |
| 1224 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
| 1225 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
| 1226 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
| 1227 | if (time != 0xffffffff) |
| 1228 | { |
| 1229 | while (fuzz > (time/16)) |
| 1230 | fuzz = fuzz/2; |
| 1231 | option_put(mess, end, OPTION_T1, 4, (time/2) - fuzz); |
| 1232 | option_put(mess, end, OPTION_T2, 4, ((time/8)*7) - fuzz); |
| 1233 | } |
| 1234 | do_options(context, mess, end, req_options, hostname, get_domain(mess->yiaddr), |
| 1235 | domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid); |
| 1236 | } |
| 1237 | |
| 1238 | return dhcp_packet_size(mess, netid, agent_id, real_end); |
| 1239 | |
| 1240 | case DHCPINFORM: |
| 1241 | if (ignore || have_config(config, CONFIG_DISABLE)) |
| 1242 | message = _("ignored"); |
| 1243 | |
| 1244 | log_packet("DHCPINFORM", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
| 1245 | |
| 1246 | if (message || mess->ciaddr.s_addr == 0) |
| 1247 | return 0; |
| 1248 | |
| 1249 | /* For DHCPINFORM only, cope without a valid context */ |
| 1250 | context = narrow_context(context, mess->ciaddr, netid); |
| 1251 | |
| 1252 | /* Find a least based on IP address if we didn't |
| 1253 | get one from MAC address/client-d */ |
| 1254 | if (!lease && |
| 1255 | (lease = lease_find_by_addr(mess->ciaddr)) && |
| 1256 | lease->hostname) |
| 1257 | hostname = lease->hostname; |
| 1258 | |
| 1259 | if (!hostname) |
| 1260 | hostname = host_from_dns(mess->ciaddr); |
| 1261 | |
| 1262 | log_packet("DHCPACK", &mess->ciaddr, emac, emac_len, iface_name, hostname, mess->xid); |
| 1263 | |
| 1264 | if (context && context->netid.net) |
| 1265 | { |
| 1266 | context->netid.next = netid; |
| 1267 | netid = &context->netid; |
| 1268 | } |
| 1269 | |
| 1270 | if (lease) |
| 1271 | { |
| 1272 | if (override.s_addr != 0) |
| 1273 | lease->override = override; |
| 1274 | else |
| 1275 | override = lease->override; |
| 1276 | } |
| 1277 | |
| 1278 | clear_packet(mess, end); |
| 1279 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
| 1280 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
| 1281 | |
| 1282 | if (lease) |
| 1283 | { |
| 1284 | if (lease->expires == 0) |
| 1285 | time = 0xffffffff; |
| 1286 | else |
| 1287 | time = (unsigned int)difftime(lease->expires, now); |
| 1288 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
| 1289 | lease_set_interface(lease, int_index); |
| 1290 | } |
| 1291 | |
| 1292 | do_options(context, mess, end, req_options, hostname, get_domain(mess->ciaddr), |
| 1293 | domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid); |
| 1294 | |
| 1295 | *is_inform = 1; /* handle reply differently */ |
| 1296 | return dhcp_packet_size(mess, netid, agent_id, real_end); |
| 1297 | } |
| 1298 | |
| 1299 | return 0; |
| 1300 | } |
| 1301 | |
| 1302 | /* find a good value to use as MAC address for logging and address-allocation hashing. |
| 1303 | This is normally just the chaddr field from the DHCP packet, |
| 1304 | but eg Firewire will have hlen == 0 and use the client-id instead. |
| 1305 | This could be anything, but will normally be EUI64 for Firewire. |
| 1306 | We assume that if the first byte of the client-id equals the htype byte |
| 1307 | then the client-id is using the usual encoding and use the rest of the |
| 1308 | client-id: if not we can use the whole client-id. This should give |
| 1309 | sane MAC address logs. */ |
| 1310 | unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, |
| 1311 | int clid_len, unsigned char *clid, int *len_out) |
| 1312 | { |
| 1313 | if (hwlen == 0 && clid && clid_len > 3) |
| 1314 | { |
| 1315 | if (clid[0] == hwtype) |
| 1316 | { |
| 1317 | *len_out = clid_len - 1 ; |
| 1318 | return clid + 1; |
| 1319 | } |
| 1320 | |
| 1321 | #if defined(ARPHRD_EUI64) && defined(ARPHRD_IEEE1394) |
| 1322 | if (clid[0] == ARPHRD_EUI64 && hwtype == ARPHRD_IEEE1394) |
| 1323 | { |
| 1324 | *len_out = clid_len - 1 ; |
| 1325 | return clid + 1; |
| 1326 | } |
| 1327 | #endif |
| 1328 | |
| 1329 | *len_out = clid_len; |
| 1330 | return clid; |
| 1331 | } |
| 1332 | |
| 1333 | *len_out = hwlen; |
| 1334 | return hwaddr; |
| 1335 | } |
| 1336 | |
| 1337 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt) |
| 1338 | { |
| 1339 | unsigned int time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time; |
| 1340 | |
| 1341 | if (opt) |
| 1342 | { |
| 1343 | unsigned int req_time = option_uint(opt, 0, 4); |
| 1344 | if (req_time < 120 ) |
| 1345 | req_time = 120; /* sanity */ |
| 1346 | if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time)) |
| 1347 | time = req_time; |
| 1348 | } |
| 1349 | |
| 1350 | return time; |
| 1351 | } |
| 1352 | |
| 1353 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback) |
| 1354 | { |
| 1355 | if (override.s_addr != 0) |
| 1356 | return override; |
| 1357 | else if (context) |
| 1358 | return context->local; |
| 1359 | else |
| 1360 | return fallback; |
| 1361 | } |
| 1362 | |
| 1363 | static int sanitise(unsigned char *opt, char *buf) |
| 1364 | { |
| 1365 | char *p; |
| 1366 | int i; |
| 1367 | |
| 1368 | *buf = 0; |
| 1369 | |
| 1370 | if (!opt) |
| 1371 | return 0; |
| 1372 | |
| 1373 | p = option_ptr(opt, 0); |
| 1374 | |
| 1375 | for (i = option_len(opt); i > 0; i--) |
| 1376 | { |
| 1377 | char c = *p++; |
| 1378 | if (isprint((int)c)) |
| 1379 | *buf++ = c; |
| 1380 | } |
| 1381 | *buf = 0; /* add terminator */ |
| 1382 | |
| 1383 | return 1; |
| 1384 | } |
| 1385 | |
| 1386 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, |
| 1387 | int mac_len, char *interface, char *string, u32 xid) |
| 1388 | { |
| 1389 | struct in_addr a; |
| 1390 | |
| 1391 | /* addr may be misaligned */ |
| 1392 | if (addr) |
| 1393 | memcpy(&a, addr, sizeof(a)); |
| 1394 | |
| 1395 | print_mac(daemon->namebuff, ext_mac, mac_len); |
| 1396 | |
| 1397 | if(daemon->options & OPT_LOG_OPTS) |
| 1398 | my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s%s %s", |
| 1399 | ntohl(xid), |
| 1400 | type, |
| 1401 | interface, |
| 1402 | addr ? inet_ntoa(a) : "", |
| 1403 | addr ? " " : "", |
| 1404 | daemon->namebuff, |
| 1405 | string ? string : ""); |
| 1406 | else |
| 1407 | my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s%s %s", |
| 1408 | type, |
| 1409 | interface, |
| 1410 | addr ? inet_ntoa(a) : "", |
| 1411 | addr ? " " : "", |
| 1412 | daemon->namebuff, |
| 1413 | string ? string : ""); |
| 1414 | } |
| 1415 | |
| 1416 | static void log_options(unsigned char *start, u32 xid) |
| 1417 | { |
| 1418 | while (*start != OPTION_END) |
| 1419 | { |
| 1420 | int is_ip, is_name, i; |
| 1421 | char *text = option_string(start[0], &is_ip, &is_name); |
| 1422 | unsigned char trunc = option_len(start); |
| 1423 | |
| 1424 | if (is_ip) |
| 1425 | for (daemon->namebuff[0]= 0, i = 0; i <= trunc - INADDRSZ; i += INADDRSZ) |
| 1426 | { |
| 1427 | if (i != 0) |
| 1428 | strncat(daemon->namebuff, ", ", 256 - strlen(daemon->namebuff)); |
| 1429 | strncat(daemon->namebuff, inet_ntoa(option_addr_arr(start, i)), 256 - strlen(daemon->namebuff)); |
| 1430 | } |
| 1431 | else if (!is_name || !sanitise(start, daemon->namebuff)) |
| 1432 | { |
| 1433 | if (trunc > 13) |
| 1434 | trunc = 13; |
| 1435 | print_mac(daemon->namebuff, option_ptr(start, 0), trunc); |
| 1436 | } |
| 1437 | |
| 1438 | my_syslog(MS_DHCP | LOG_INFO, "%u sent size:%3d option:%3d%s%s%s%s%s", |
| 1439 | ntohl(xid), option_len(start), start[0], |
| 1440 | text ? ":" : "", text ? text : "", |
| 1441 | trunc == 0 ? "" : " ", |
| 1442 | trunc == 0 ? "" : daemon->namebuff, |
| 1443 | trunc == option_len(start) ? "" : "..."); |
| 1444 | start += start[1] + 2; |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize) |
| 1449 | { |
| 1450 | while (1) |
| 1451 | { |
| 1452 | if (p > end) |
| 1453 | return NULL; |
| 1454 | else if (*p == OPTION_END) |
| 1455 | return opt == OPTION_END ? p : NULL; |
| 1456 | else if (*p == OPTION_PAD) |
| 1457 | p++; |
| 1458 | else |
| 1459 | { |
| 1460 | int opt_len; |
| 1461 | if (p > end - 2) |
| 1462 | return NULL; /* malformed packet */ |
| 1463 | opt_len = option_len(p); |
| 1464 | if (p > end - (2 + opt_len)) |
| 1465 | return NULL; /* malformed packet */ |
| 1466 | if (*p == opt && opt_len >= minsize) |
| 1467 | return p; |
| 1468 | p += opt_len + 2; |
| 1469 | } |
| 1470 | } |
| 1471 | } |
| 1472 | |
| 1473 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize) |
| 1474 | { |
| 1475 | unsigned char *ret, *overload; |
| 1476 | |
| 1477 | /* skip over DHCP cookie; */ |
| 1478 | if ((ret = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, opt_type, minsize))) |
| 1479 | return ret; |
| 1480 | |
| 1481 | /* look for overload option. */ |
| 1482 | if (!(overload = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, OPTION_OVERLOAD, 1))) |
| 1483 | return NULL; |
| 1484 | |
| 1485 | /* Can we look in filename area ? */ |
| 1486 | if ((overload[2] & 1) && |
| 1487 | (ret = option_find1(&mess->file[0], &mess->file[128], opt_type, minsize))) |
| 1488 | return ret; |
| 1489 | |
| 1490 | /* finally try sname area */ |
| 1491 | if ((overload[2] & 2) && |
| 1492 | (ret = option_find1(&mess->sname[0], &mess->sname[64], opt_type, minsize))) |
| 1493 | return ret; |
| 1494 | |
| 1495 | return NULL; |
| 1496 | } |
| 1497 | |
| 1498 | static struct in_addr option_addr_arr(unsigned char *opt, int offset) |
| 1499 | { |
| 1500 | /* this worries about unaligned data in the option. */ |
| 1501 | /* struct in_addr is network byte order */ |
| 1502 | struct in_addr ret; |
| 1503 | |
| 1504 | memcpy(&ret, option_ptr(opt, offset), INADDRSZ); |
| 1505 | |
| 1506 | return ret; |
| 1507 | } |
| 1508 | |
| 1509 | static struct in_addr option_addr(unsigned char *opt) |
| 1510 | { |
| 1511 | return option_addr_arr(opt, 0); |
| 1512 | } |
| 1513 | |
| 1514 | static unsigned int option_uint(unsigned char *opt, int offset, int size) |
| 1515 | { |
| 1516 | /* this worries about unaligned data and byte order */ |
| 1517 | unsigned int ret = 0; |
| 1518 | int i; |
| 1519 | unsigned char *p = option_ptr(opt, offset); |
| 1520 | |
| 1521 | for (i = 0; i < size; i++) |
| 1522 | ret = (ret << 8) | *p++; |
| 1523 | |
| 1524 | return ret; |
| 1525 | } |
| 1526 | |
| 1527 | static unsigned char *dhcp_skip_opts(unsigned char *start) |
| 1528 | { |
| 1529 | while (*start != 0) |
| 1530 | start += start[1] + 2; |
| 1531 | return start; |
| 1532 | } |
| 1533 | |
| 1534 | /* only for use when building packet: doesn't check for bad data. */ |
| 1535 | static unsigned char *find_overload(struct dhcp_packet *mess) |
| 1536 | { |
| 1537 | unsigned char *p = &mess->options[0] + sizeof(u32); |
| 1538 | |
| 1539 | while (*p != 0) |
| 1540 | { |
| 1541 | if (*p == OPTION_OVERLOAD) |
| 1542 | return p; |
| 1543 | p += p[1] + 2; |
| 1544 | } |
| 1545 | return NULL; |
| 1546 | } |
| 1547 | |
| 1548 | static size_t dhcp_packet_size(struct dhcp_packet *mess, struct dhcp_netid *netid, |
| 1549 | unsigned char *agent_id, unsigned char *real_end) |
| 1550 | { |
| 1551 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); |
| 1552 | unsigned char *overload; |
| 1553 | size_t ret; |
| 1554 | struct dhcp_netid_list *id_list; |
| 1555 | struct dhcp_netid *n; |
| 1556 | |
| 1557 | /* move agent_id back down to the end of the packet */ |
| 1558 | if (agent_id) |
| 1559 | { |
| 1560 | memmove(p, agent_id, real_end - agent_id); |
| 1561 | p += real_end - agent_id; |
| 1562 | memset(p, 0, real_end - p); /* in case of overlap */ |
| 1563 | } |
| 1564 | |
| 1565 | /* We do logging too */ |
| 1566 | if (netid && (daemon->options & OPT_LOG_OPTS)) |
| 1567 | { |
| 1568 | char *s = daemon->namebuff; |
| 1569 | for (*s = 0; netid; netid = netid->next) |
| 1570 | { |
| 1571 | /* kill dupes. */ |
| 1572 | for (n = netid->next; n; n = n->next) |
| 1573 | if (strcmp(netid->net, n->net) == 0) |
| 1574 | break; |
| 1575 | |
| 1576 | if (!n) |
| 1577 | { |
| 1578 | strncat (s, netid->net, (MAXDNAME-1) - strlen(s)); |
| 1579 | if (netid->next) |
| 1580 | strncat (s, ", ", (MAXDNAME-1) - strlen(s)); |
| 1581 | } |
| 1582 | } |
| 1583 | my_syslog(MS_DHCP | LOG_INFO, _("%u tags: %s"), ntohl(mess->xid), s); |
| 1584 | } |
| 1585 | |
| 1586 | /* add END options to the regions. */ |
| 1587 | overload = find_overload(mess); |
| 1588 | |
| 1589 | if (overload && (option_uint(overload, 0, 1) & 1)) |
| 1590 | { |
| 1591 | *dhcp_skip_opts(mess->file) = OPTION_END; |
| 1592 | if (daemon->options & OPT_LOG_OPTS) |
| 1593 | log_options(mess->file, mess->xid); |
| 1594 | } |
| 1595 | else if ((daemon->options & OPT_LOG_OPTS) && strlen((char *)mess->file) != 0) |
| 1596 | my_syslog(MS_DHCP | LOG_INFO, _("%u bootfile name: %s"), ntohl(mess->xid), (char *)mess->file); |
| 1597 | |
| 1598 | if (overload && (option_uint(overload, 0, 1) & 2)) |
| 1599 | { |
| 1600 | *dhcp_skip_opts(mess->sname) = OPTION_END; |
| 1601 | if (daemon->options & OPT_LOG_OPTS) |
| 1602 | log_options(mess->sname, mess->xid); |
| 1603 | } |
| 1604 | else if ((daemon->options & OPT_LOG_OPTS) && strlen((char *)mess->sname) != 0) |
| 1605 | my_syslog(MS_DHCP | LOG_INFO, _("%u server name: %s"), ntohl(mess->xid), (char *)mess->sname); |
| 1606 | |
| 1607 | |
| 1608 | *p++ = OPTION_END; |
| 1609 | |
| 1610 | if (daemon->options & OPT_LOG_OPTS) |
| 1611 | { |
| 1612 | if (mess->siaddr.s_addr != 0) |
| 1613 | my_syslog(MS_DHCP | LOG_INFO, _("%u next server: %s"), ntohl(mess->xid), inet_ntoa(mess->siaddr)); |
| 1614 | |
| 1615 | log_options(&mess->options[0] + sizeof(u32), mess->xid); |
| 1616 | } |
| 1617 | |
| 1618 | for (id_list = daemon->force_broadcast; id_list; id_list = id_list->next) |
| 1619 | if (match_netid(id_list->list, netid, 0)) |
| 1620 | mess->flags |= htons(0x8000); /* force broadcast */ |
| 1621 | |
| 1622 | ret = (size_t)(p - (unsigned char *)mess); |
| 1623 | |
| 1624 | if (ret < MIN_PACKETSZ) |
| 1625 | ret = MIN_PACKETSZ; |
| 1626 | |
| 1627 | return ret; |
| 1628 | } |
| 1629 | |
| 1630 | static unsigned char *free_space(struct dhcp_packet *mess, unsigned char *end, int opt, int len) |
| 1631 | { |
| 1632 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); |
| 1633 | |
| 1634 | if (p + len + 3 >= end) |
| 1635 | /* not enough space in options area, try and use overload, if poss */ |
| 1636 | { |
| 1637 | unsigned char *overload; |
| 1638 | |
| 1639 | if (!(overload = find_overload(mess)) && |
| 1640 | (mess->file[0] == 0 || mess->sname[0] == 0)) |
| 1641 | { |
| 1642 | /* attempt to overload fname and sname areas, we've reserved space for the |
| 1643 | overflow option previuously. */ |
| 1644 | overload = p; |
| 1645 | *(p++) = OPTION_OVERLOAD; |
| 1646 | *(p++) = 1; |
| 1647 | } |
| 1648 | |
| 1649 | p = NULL; |
| 1650 | |
| 1651 | /* using filename field ? */ |
| 1652 | if (overload) |
| 1653 | { |
| 1654 | if (mess->file[0] == 0) |
| 1655 | overload[2] |= 1; |
| 1656 | |
| 1657 | if (overload[2] & 1) |
| 1658 | { |
| 1659 | p = dhcp_skip_opts(mess->file); |
| 1660 | if (p + len + 3 >= mess->file + sizeof(mess->file)) |
| 1661 | p = NULL; |
| 1662 | } |
| 1663 | |
| 1664 | if (!p) |
| 1665 | { |
| 1666 | /* try to bring sname into play (it may be already) */ |
| 1667 | if (mess->sname[0] == 0) |
| 1668 | overload[2] |= 2; |
| 1669 | |
| 1670 | if (overload[2] & 2) |
| 1671 | { |
| 1672 | p = dhcp_skip_opts(mess->sname); |
| 1673 | if (p + len + 3 >= mess->sname + sizeof(mess->file)) |
| 1674 | p = NULL; |
| 1675 | } |
| 1676 | } |
| 1677 | } |
| 1678 | |
| 1679 | if (!p) |
| 1680 | my_syslog(MS_DHCP | LOG_WARNING, _("cannot send DHCP/BOOTP option %d: no space left in packet"), opt); |
| 1681 | } |
| 1682 | |
| 1683 | if (p) |
| 1684 | { |
| 1685 | *(p++) = opt; |
| 1686 | *(p++) = len; |
| 1687 | } |
| 1688 | |
| 1689 | return p; |
| 1690 | } |
| 1691 | |
| 1692 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val) |
| 1693 | { |
| 1694 | int i; |
| 1695 | unsigned char *p = free_space(mess, end, opt, len); |
| 1696 | |
| 1697 | if (p) |
| 1698 | for (i = 0; i < len; i++) |
| 1699 | *(p++) = val >> (8 * (len - (i + 1))); |
| 1700 | } |
| 1701 | |
| 1702 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, int opt, |
| 1703 | char *string, int null_term) |
| 1704 | { |
| 1705 | unsigned char *p; |
| 1706 | size_t len = strlen(string); |
| 1707 | |
| 1708 | if (null_term && len != 255) |
| 1709 | len++; |
| 1710 | |
| 1711 | if ((p = free_space(mess, end, opt, len))) |
| 1712 | memcpy(p, string, len); |
| 1713 | } |
| 1714 | |
| 1715 | /* return length, note this only does the data part */ |
| 1716 | static int do_opt(struct dhcp_opt *opt, unsigned char *p, struct dhcp_context *context, int null_term) |
| 1717 | { |
| 1718 | int len = opt->len; |
| 1719 | |
| 1720 | if ((opt->flags & DHOPT_STRING) && null_term && len != 255) |
| 1721 | len++; |
| 1722 | |
| 1723 | if (p && len != 0) |
| 1724 | { |
| 1725 | if (context && (opt->flags & DHOPT_ADDR)) |
| 1726 | { |
| 1727 | int j; |
| 1728 | struct in_addr *a = (struct in_addr *)opt->val; |
| 1729 | for (j = 0; j < opt->len; j+=INADDRSZ, a++) |
| 1730 | { |
| 1731 | /* zero means "self" (but not in vendorclass options.) */ |
| 1732 | if (a->s_addr == 0) |
| 1733 | memcpy(p, &context->local, INADDRSZ); |
| 1734 | else |
| 1735 | memcpy(p, a, INADDRSZ); |
| 1736 | p += INADDRSZ; |
| 1737 | } |
| 1738 | } |
| 1739 | else |
| 1740 | memcpy(p, opt->val, len); |
| 1741 | } |
| 1742 | return len; |
| 1743 | } |
| 1744 | |
| 1745 | static int in_list(unsigned char *list, int opt) |
| 1746 | { |
| 1747 | int i; |
| 1748 | |
| 1749 | /* If no requested options, send everything, not nothing. */ |
| 1750 | if (!list) |
| 1751 | return 1; |
| 1752 | |
| 1753 | for (i = 0; list[i] != OPTION_END; i++) |
| 1754 | if (opt == list[i]) |
| 1755 | return 1; |
| 1756 | |
| 1757 | return 0; |
| 1758 | } |
| 1759 | |
| 1760 | static struct dhcp_opt *option_find2(struct dhcp_netid *netid, struct dhcp_opt *opts, int opt) |
| 1761 | { |
| 1762 | struct dhcp_opt *tmp; |
| 1763 | for (tmp = opts; tmp; tmp = tmp->next) |
| 1764 | if (tmp->opt == opt && !(tmp->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR))) |
| 1765 | if (match_netid(tmp->netid, netid, netid ? 0 : 1)) |
| 1766 | return tmp; |
| 1767 | |
| 1768 | return netid ? option_find2(NULL, opts, opt) : NULL; |
| 1769 | } |
| 1770 | |
| 1771 | /* mark vendor-encapsulated options which match the client-supplied or |
| 1772 | config-supplied vendor class */ |
| 1773 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt) |
| 1774 | { |
| 1775 | for (; dopt; dopt = dopt->next) |
| 1776 | { |
| 1777 | dopt->flags &= ~DHOPT_VENDOR_MATCH; |
| 1778 | if (opt && (dopt->flags & DHOPT_VENDOR)) |
| 1779 | { |
| 1780 | int i, len = 0; |
| 1781 | if (dopt->u.vendor_class) |
| 1782 | len = strlen((char *)dopt->u.vendor_class); |
| 1783 | for (i = 0; i <= (option_len(opt) - len); i++) |
| 1784 | if (len == 0 || memcmp(dopt->u.vendor_class, option_ptr(opt, i), len) == 0) |
| 1785 | { |
| 1786 | dopt->flags |= DHOPT_VENDOR_MATCH; |
| 1787 | break; |
| 1788 | } |
| 1789 | } |
| 1790 | } |
| 1791 | } |
| 1792 | |
| 1793 | static void do_encap_opts(struct dhcp_opt *opt, int encap, int flag, |
| 1794 | struct dhcp_packet *mess, unsigned char *end, int null_term) |
| 1795 | { |
| 1796 | int len, enc_len; |
| 1797 | struct dhcp_opt *start; |
| 1798 | unsigned char *p; |
| 1799 | |
| 1800 | /* find size in advance */ |
| 1801 | for (enc_len = 0, start = opt; opt; opt = opt->next) |
| 1802 | if (opt->flags & flag) |
| 1803 | { |
| 1804 | int new = do_opt(opt, NULL, NULL, null_term) + 2; |
| 1805 | if (enc_len + new <= 255) |
| 1806 | enc_len += new; |
| 1807 | else |
| 1808 | { |
| 1809 | p = free_space(mess, end, encap, enc_len); |
| 1810 | for (; start && start != opt; start = start->next) |
| 1811 | if (p && (start->flags & flag)) |
| 1812 | { |
| 1813 | len = do_opt(start, p + 2, NULL, null_term); |
| 1814 | *(p++) = start->opt; |
| 1815 | *(p++) = len; |
| 1816 | p += len; |
| 1817 | } |
| 1818 | enc_len = new; |
| 1819 | start = opt; |
| 1820 | } |
| 1821 | } |
| 1822 | |
| 1823 | if (enc_len != 0 && |
| 1824 | (p = free_space(mess, end, encap, enc_len + 1))) |
| 1825 | { |
| 1826 | for (; start; start = start->next) |
| 1827 | if (start->flags & flag) |
| 1828 | { |
| 1829 | len = do_opt(start, p + 2, NULL, null_term); |
| 1830 | *(p++) = start->opt; |
| 1831 | *(p++) = len; |
| 1832 | p += len; |
| 1833 | } |
| 1834 | *p = OPTION_END; |
| 1835 | } |
| 1836 | } |
| 1837 | |
| 1838 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid) |
| 1839 | { |
| 1840 | unsigned char *p; |
| 1841 | |
| 1842 | option_put_string(mess, end, OPTION_VENDOR_ID, "PXEClient", 0); |
| 1843 | if (uuid && (p = free_space(mess, end, OPTION_PXE_UUID, 17))) |
| 1844 | memcpy(p, uuid, 17); |
| 1845 | } |
| 1846 | |
| 1847 | static int prune_vendor_opts(struct dhcp_netid *netid) |
| 1848 | { |
| 1849 | int force = 0; |
| 1850 | struct dhcp_opt *opt; |
| 1851 | |
| 1852 | /* prune vendor-encapsulated options based on netid, and look if we're forcing them to be sent */ |
| 1853 | for (opt = daemon->dhcp_opts; opt; opt = opt->next) |
| 1854 | if (opt->flags & DHOPT_VENDOR_MATCH) |
| 1855 | { |
| 1856 | if (!match_netid(opt->netid, netid, 1)) |
| 1857 | opt->flags &= ~DHOPT_VENDOR_MATCH; |
| 1858 | else if (opt->flags & DHOPT_FORCE) |
| 1859 | force = 1; |
| 1860 | } |
| 1861 | return force; |
| 1862 | } |
| 1863 | |
| 1864 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid) |
| 1865 | { |
| 1866 | #define NUM_OPTS 4 |
| 1867 | |
| 1868 | unsigned char *p, *q; |
| 1869 | struct pxe_service *service; |
| 1870 | static struct dhcp_opt *o, *ret; |
| 1871 | int i, j = NUM_OPTS - 1; |
| 1872 | |
| 1873 | /* We pass back references to these, hence they are declared static */ |
| 1874 | static unsigned char discovery_control; |
| 1875 | static unsigned char fake_prompt[] = { 0, 'P', 'X', 'E' }; |
| 1876 | static struct dhcp_opt *fake_opts = NULL; |
| 1877 | |
| 1878 | /* We are found by broadcast, so disable multicast. It gets switched on again |
| 1879 | if we point to other servers and don't give a unicast address. Note that |
| 1880 | we don't provide our own address for services we are the boot server for because unicast |
| 1881 | discovery is to port 4011 and we don't listen there. If you are using proxy DHCP |
| 1882 | and DHCP relays, the relay will need to forward to the proxy too. */ |
| 1883 | discovery_control = 2; |
| 1884 | |
| 1885 | ret = daemon->dhcp_opts; |
| 1886 | |
| 1887 | if (!fake_opts && !(fake_opts = whine_malloc(NUM_OPTS * sizeof(struct dhcp_opt)))) |
| 1888 | return ret; |
| 1889 | |
| 1890 | for (i = 0; i < NUM_OPTS; i++) |
| 1891 | { |
| 1892 | fake_opts[i].flags = DHOPT_VENDOR_MATCH; |
| 1893 | fake_opts[i].netid = NULL; |
| 1894 | fake_opts[i].next = i == (NUM_OPTS - 1) ? ret : &fake_opts[i+1]; |
| 1895 | } |
| 1896 | |
| 1897 | /* create the data for the PXE_MENU and PXE_SERVERS options. */ |
| 1898 | p = (unsigned char *)daemon->dhcp_buff; |
| 1899 | q = (unsigned char *)daemon->dhcp_buff2; |
| 1900 | |
| 1901 | for (i = 0, service = daemon->pxe_services; service; service = service->next) |
| 1902 | if (pxe_arch == service->CSA && match_netid(service->netid, netid, 1)) |
| 1903 | { |
| 1904 | size_t len = strlen(service->menu); |
| 1905 | /* opt 43 max size is 255. encapsulated option has type and length |
| 1906 | bytes, so its max size is 253. */ |
| 1907 | if (p - (unsigned char *)daemon->dhcp_buff + len + 3 < 253) |
| 1908 | { |
| 1909 | *(p++) = service->type >> 8; |
| 1910 | *(p++) = service->type; |
| 1911 | *(p++) = len; |
| 1912 | memcpy(p, service->menu, len); |
| 1913 | p += len; |
| 1914 | i++; |
| 1915 | } |
| 1916 | else |
| 1917 | { |
| 1918 | toobig: |
| 1919 | my_syslog(MS_DHCP | LOG_ERR, _("PXE menu too large")); |
| 1920 | return daemon->dhcp_opts; |
| 1921 | } |
| 1922 | |
| 1923 | if (!service->basename) |
| 1924 | { |
| 1925 | if (service->server.s_addr != 0) |
| 1926 | { |
| 1927 | if (q - (unsigned char *)daemon->dhcp_buff2 + 3 + INADDRSZ >= 253) |
| 1928 | goto toobig; |
| 1929 | |
| 1930 | /* Boot service with known address - give it */ |
| 1931 | *(q++) = service->type >> 8; |
| 1932 | *(q++) = service->type; |
| 1933 | *(q++) = 1; |
| 1934 | /* dest misaligned */ |
| 1935 | memcpy(q, &service->server.s_addr, INADDRSZ); |
| 1936 | q += INADDRSZ; |
| 1937 | } |
| 1938 | else if (service->type != 0) |
| 1939 | /* We're not supplying a server, so let the client multicast. |
| 1940 | type zero is "local boot" so no need for M/C on that. */ |
| 1941 | discovery_control = 0; |
| 1942 | } |
| 1943 | } |
| 1944 | |
| 1945 | /* if no prompt, wait forever if there's a choice */ |
| 1946 | fake_prompt[0] = (i > 1) ? 255 : 0; |
| 1947 | |
| 1948 | if (i == 0) |
| 1949 | discovery_control = 8; /* no menu - just use use mess->filename */ |
| 1950 | else |
| 1951 | { |
| 1952 | ret = &fake_opts[j--]; |
| 1953 | ret->len = p - (unsigned char *)daemon->dhcp_buff; |
| 1954 | ret->val = (unsigned char *)daemon->dhcp_buff; |
| 1955 | ret->opt = SUBOPT_PXE_MENU; |
| 1956 | |
| 1957 | if (q - (unsigned char *)daemon->dhcp_buff2 != 0) |
| 1958 | { |
| 1959 | ret = &fake_opts[j--]; |
| 1960 | ret->len = q - (unsigned char *)daemon->dhcp_buff2; |
| 1961 | ret->val = (unsigned char *)daemon->dhcp_buff2; |
| 1962 | ret->opt = SUBOPT_PXE_SERVERS; |
| 1963 | } |
| 1964 | } |
| 1965 | |
| 1966 | for (o = daemon->dhcp_opts; o; o = o->next) |
| 1967 | if ((o->flags & DHOPT_VENDOR_MATCH) && o->opt == SUBOPT_PXE_MENU_PROMPT) |
| 1968 | break; |
| 1969 | |
| 1970 | if (!o) |
| 1971 | { |
| 1972 | ret = &fake_opts[j--]; |
| 1973 | ret->len = sizeof(fake_prompt); |
| 1974 | ret->val = fake_prompt; |
| 1975 | ret->opt = SUBOPT_PXE_MENU_PROMPT; |
| 1976 | } |
| 1977 | |
| 1978 | if (discovery_control != 0) |
| 1979 | { |
| 1980 | ret = &fake_opts[j--]; |
| 1981 | ret->len = 1; |
| 1982 | ret->opt = SUBOPT_PXE_DISCOVERY; |
| 1983 | ret->val= &discovery_control; |
| 1984 | } |
| 1985 | |
| 1986 | return ret; |
| 1987 | } |
| 1988 | |
| 1989 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end) |
| 1990 | { |
| 1991 | memset(mess->sname, 0, sizeof(mess->sname)); |
| 1992 | memset(mess->file, 0, sizeof(mess->file)); |
| 1993 | memset(&mess->options[0] + sizeof(u32), 0, end - (&mess->options[0] + sizeof(u32))); |
| 1994 | mess->siaddr.s_addr = 0; |
| 1995 | } |
| 1996 | |
| 1997 | struct dhcp_boot *find_boot(struct dhcp_netid *netid) |
| 1998 | { |
| 1999 | struct dhcp_boot *boot; |
| 2000 | |
| 2001 | /* decide which dhcp-boot option we're using */ |
| 2002 | for (boot = daemon->boot_config; boot; boot = boot->next) |
| 2003 | if (match_netid(boot->netid, netid, 0)) |
| 2004 | break; |
| 2005 | if (!boot) |
| 2006 | /* No match, look for one without a netid */ |
| 2007 | for (boot = daemon->boot_config; boot; boot = boot->next) |
| 2008 | if (match_netid(boot->netid, netid, 1)) |
| 2009 | break; |
| 2010 | |
| 2011 | return boot; |
| 2012 | } |
| 2013 | |
| 2014 | static void do_options(struct dhcp_context *context, |
| 2015 | struct dhcp_packet *mess, |
| 2016 | unsigned char *end, |
| 2017 | unsigned char *req_options, |
| 2018 | char *hostname, |
| 2019 | char *domain, char *config_domain, |
| 2020 | struct dhcp_netid *netid, |
| 2021 | struct in_addr subnet_addr, |
| 2022 | unsigned char fqdn_flags, |
| 2023 | int null_term, int pxe_arch, |
| 2024 | unsigned char *uuid) |
| 2025 | { |
| 2026 | struct dhcp_opt *opt, *config_opts = daemon->dhcp_opts; |
| 2027 | struct dhcp_boot *boot; |
| 2028 | unsigned char *p; |
| 2029 | int i, len, force_encap = 0; |
| 2030 | unsigned char f0 = 0, s0 = 0; |
| 2031 | int done_file = 0, done_server = 0; |
| 2032 | |
| 2033 | if (config_domain && (!domain || !hostname_isequal(domain, config_domain))) |
| 2034 | my_syslog(MS_DHCP | LOG_WARNING, _("Ignoring domain %s for DHCP host name %s"), config_domain, hostname); |
| 2035 | |
| 2036 | /* logging */ |
| 2037 | if ((daemon->options & OPT_LOG_OPTS) && req_options) |
| 2038 | { |
| 2039 | char *q = daemon->namebuff; |
| 2040 | for (i = 0; req_options[i] != OPTION_END; i++) |
| 2041 | { |
| 2042 | char *s = option_string(req_options[i], NULL, NULL); |
| 2043 | q += snprintf(q, MAXDNAME - (q - daemon->namebuff), |
| 2044 | "%d%s%s%s", |
| 2045 | req_options[i], |
| 2046 | s ? ":" : "", |
| 2047 | s ? s : "", |
| 2048 | req_options[i+1] == OPTION_END ? "" : ", "); |
| 2049 | if (req_options[i+1] == OPTION_END || (q - daemon->namebuff) > 40) |
| 2050 | { |
| 2051 | q = daemon->namebuff; |
| 2052 | my_syslog(MS_DHCP | LOG_INFO, _("%u requested options: %s"), ntohl(mess->xid), daemon->namebuff); |
| 2053 | } |
| 2054 | } |
| 2055 | } |
| 2056 | |
| 2057 | if (context) |
| 2058 | mess->siaddr = context->local; |
| 2059 | |
| 2060 | /* See if we can send the boot stuff as options. |
| 2061 | To do this we need a requested option list, BOOTP |
| 2062 | and very old DHCP clients won't have this, we also |
| 2063 | provide an manual option to disable it. |
| 2064 | Some PXE ROMs have bugs (surprise!) and need zero-terminated |
| 2065 | names, so we always send those. */ |
| 2066 | if ((boot = find_boot(netid))) |
| 2067 | { |
| 2068 | if (boot->sname) |
| 2069 | { |
| 2070 | if (!(daemon->options & OPT_NO_OVERRIDE) && |
| 2071 | req_options && |
| 2072 | in_list(req_options, OPTION_SNAME)) |
| 2073 | option_put_string(mess, end, OPTION_SNAME, boot->sname, 1); |
| 2074 | else |
| 2075 | strncpy((char *)mess->sname, boot->sname, sizeof(mess->sname)-1); |
| 2076 | } |
| 2077 | |
| 2078 | if (boot->file) |
| 2079 | { |
| 2080 | if (!(daemon->options & OPT_NO_OVERRIDE) && |
| 2081 | req_options && |
| 2082 | in_list(req_options, OPTION_FILENAME)) |
| 2083 | option_put_string(mess, end, OPTION_FILENAME, boot->file, 1); |
| 2084 | else |
| 2085 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); |
| 2086 | } |
| 2087 | |
| 2088 | if (boot->next_server.s_addr) |
| 2089 | mess->siaddr = boot->next_server; |
| 2090 | } |
| 2091 | else |
| 2092 | /* Use the values of the relevant options if no dhcp-boot given and |
| 2093 | they're not explicitly asked for as options. OPTION_END is used |
| 2094 | as an internal way to specify siaddr without using dhcp-boot, for use in |
| 2095 | dhcp-optsfile. */ |
| 2096 | { |
| 2097 | if ((!req_options || !in_list(req_options, OPTION_FILENAME)) && mess->file[0] == 0 && |
| 2098 | (opt = option_find2(netid, config_opts, OPTION_FILENAME)) && !(opt->flags & DHOPT_FORCE)) |
| 2099 | { |
| 2100 | strncpy((char *)mess->file, (char *)opt->val, sizeof(mess->file)-1); |
| 2101 | done_file = 1; |
| 2102 | } |
| 2103 | |
| 2104 | if ((!req_options || !in_list(req_options, OPTION_SNAME)) && |
| 2105 | (opt = option_find2(netid, config_opts, OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE)) |
| 2106 | { |
| 2107 | strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess->sname)-1); |
| 2108 | done_server = 1; |
| 2109 | } |
| 2110 | |
| 2111 | if ((opt = option_find2(netid, config_opts, OPTION_END))) |
| 2112 | mess->siaddr.s_addr = ((struct in_addr *)opt->val)->s_addr; |
| 2113 | } |
| 2114 | |
| 2115 | /* We don't want to do option-overload for BOOTP, so make the file and sname |
| 2116 | fields look like they are in use, even when they aren't. This gets restored |
| 2117 | at the end of this function. */ |
| 2118 | |
| 2119 | if (!req_options || (daemon->options & OPT_NO_OVERRIDE)) |
| 2120 | { |
| 2121 | f0 = mess->file[0]; |
| 2122 | mess->file[0] = 1; |
| 2123 | s0 = mess->sname[0]; |
| 2124 | mess->sname[0] = 1; |
| 2125 | } |
| 2126 | |
| 2127 | /* At this point, if mess->sname or mess->file are zeroed, they are available |
| 2128 | for option overload, reserve space for the overload option. */ |
| 2129 | if (mess->file[0] == 0 || mess->sname[0] == 0) |
| 2130 | end -= 3; |
| 2131 | |
| 2132 | /* rfc3011 says this doesn't need to be in the requested options list. */ |
| 2133 | if (subnet_addr.s_addr) |
| 2134 | option_put(mess, end, OPTION_SUBNET_SELECT, INADDRSZ, ntohl(subnet_addr.s_addr)); |
| 2135 | |
| 2136 | /* replies to DHCPINFORM may not have a valid context */ |
| 2137 | if (context) |
| 2138 | { |
| 2139 | if (!option_find2(netid, config_opts, OPTION_NETMASK)) |
| 2140 | option_put(mess, end, OPTION_NETMASK, INADDRSZ, ntohl(context->netmask.s_addr)); |
| 2141 | |
| 2142 | /* May not have a "guessed" broadcast address if we got no packets via a relay |
| 2143 | from this net yet (ie just unicast renewals after a restart */ |
| 2144 | if (context->broadcast.s_addr && |
| 2145 | !option_find2(netid, config_opts, OPTION_BROADCAST)) |
| 2146 | option_put(mess, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr)); |
| 2147 | |
| 2148 | /* Same comments as broadcast apply, and also may not be able to get a sensible |
| 2149 | default when using subnet select. User must configure by steam in that case. */ |
| 2150 | if (context->router.s_addr && |
| 2151 | in_list(req_options, OPTION_ROUTER) && |
| 2152 | !option_find2(netid, config_opts, OPTION_ROUTER)) |
| 2153 | option_put(mess, end, OPTION_ROUTER, INADDRSZ, ntohl(context->router.s_addr)); |
| 2154 | |
| 2155 | if (in_list(req_options, OPTION_DNSSERVER) && |
| 2156 | !option_find2(netid, config_opts, OPTION_DNSSERVER)) |
| 2157 | option_put(mess, end, OPTION_DNSSERVER, INADDRSZ, ntohl(context->local.s_addr)); |
| 2158 | } |
| 2159 | |
| 2160 | if (domain && in_list(req_options, OPTION_DOMAINNAME) && |
| 2161 | !option_find2(netid, config_opts, OPTION_DOMAINNAME)) |
| 2162 | option_put_string(mess, end, OPTION_DOMAINNAME, domain, null_term); |
| 2163 | |
| 2164 | /* Note that we ignore attempts to set the fqdn using --dhc-option=81,<name> */ |
| 2165 | if (hostname) |
| 2166 | { |
| 2167 | if (in_list(req_options, OPTION_HOSTNAME) && |
| 2168 | !option_find2(netid, config_opts, OPTION_HOSTNAME)) |
| 2169 | option_put_string(mess, end, OPTION_HOSTNAME, hostname, null_term); |
| 2170 | |
| 2171 | if (fqdn_flags != 0) |
| 2172 | { |
| 2173 | len = strlen(hostname) + 3; |
| 2174 | |
| 2175 | if (fqdn_flags & 0x04) |
| 2176 | len += 2; |
| 2177 | else if (null_term) |
| 2178 | len++; |
| 2179 | |
| 2180 | if (domain) |
| 2181 | len += strlen(domain) + 1; |
| 2182 | |
| 2183 | if ((p = free_space(mess, end, OPTION_CLIENT_FQDN, len))) |
| 2184 | { |
| 2185 | *(p++) = fqdn_flags; |
| 2186 | *(p++) = 255; |
| 2187 | *(p++) = 255; |
| 2188 | |
| 2189 | if (fqdn_flags & 0x04) |
| 2190 | { |
| 2191 | p = do_rfc1035_name(p, hostname); |
| 2192 | if (domain) |
| 2193 | p = do_rfc1035_name(p, domain); |
| 2194 | *p++ = 0; |
| 2195 | } |
| 2196 | else |
| 2197 | { |
| 2198 | memcpy(p, hostname, strlen(hostname)); |
| 2199 | p += strlen(hostname); |
| 2200 | if (domain) |
| 2201 | { |
| 2202 | *(p++) = '.'; |
| 2203 | memcpy(p, domain, strlen(domain)); |
| 2204 | p += strlen(domain); |
| 2205 | } |
| 2206 | if (null_term) |
| 2207 | *(p++) = 0; |
| 2208 | } |
| 2209 | } |
| 2210 | } |
| 2211 | } |
| 2212 | |
| 2213 | for (opt = config_opts; opt; opt = opt->next) |
| 2214 | { |
| 2215 | int optno = opt->opt; |
| 2216 | |
| 2217 | /* was it asked for, or are we sending it anyway? */ |
| 2218 | if (!(opt->flags & DHOPT_FORCE) && !in_list(req_options, optno)) |
| 2219 | continue; |
| 2220 | |
| 2221 | /* prohibit some used-internally options */ |
| 2222 | if (optno == OPTION_CLIENT_FQDN || |
| 2223 | optno == OPTION_MAXMESSAGE || |
| 2224 | optno == OPTION_OVERLOAD || |
| 2225 | optno == OPTION_PAD || |
| 2226 | optno == OPTION_END) |
| 2227 | continue; |
| 2228 | |
| 2229 | if (optno == OPTION_SNAME && done_server) |
| 2230 | continue; |
| 2231 | |
| 2232 | if (optno == OPTION_FILENAME && done_file) |
| 2233 | continue; |
| 2234 | |
| 2235 | /* netids match and not encapsulated? */ |
| 2236 | if (opt != option_find2(netid, config_opts, optno)) |
| 2237 | continue; |
| 2238 | |
| 2239 | /* For the options we have default values on |
| 2240 | dhc-option=<optionno> means "don't include this option" |
| 2241 | not "include a zero-length option" */ |
| 2242 | if (opt->len == 0 && |
| 2243 | (optno == OPTION_NETMASK || |
| 2244 | optno == OPTION_BROADCAST || |
| 2245 | optno == OPTION_ROUTER || |
| 2246 | optno == OPTION_DNSSERVER || |
| 2247 | optno == OPTION_DOMAINNAME || |
| 2248 | optno == OPTION_HOSTNAME)) |
| 2249 | continue; |
| 2250 | |
| 2251 | /* vendor-class comes from elsewhere for PXE */ |
| 2252 | if (pxe_arch != -1 && optno == OPTION_VENDOR_ID) |
| 2253 | continue; |
| 2254 | |
| 2255 | /* always force null-term for filename and servername - buggy PXE again. */ |
| 2256 | len = do_opt(opt, NULL, context, |
| 2257 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
| 2258 | |
| 2259 | if ((p = free_space(mess, end, optno, len))) |
| 2260 | { |
| 2261 | do_opt(opt, p, context, |
| 2262 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
| 2263 | |
| 2264 | /* If we send a vendor-id, revisit which vendor-ops we consider |
| 2265 | it appropriate to send. */ |
| 2266 | if (optno == OPTION_VENDOR_ID) |
| 2267 | match_vendor_opts(p - 2, config_opts); |
| 2268 | } |
| 2269 | } |
| 2270 | |
| 2271 | /* Now send options to be encapsulated in arbitrary options, |
| 2272 | eg dhcp-option=encap:172,17,....... |
| 2273 | The may be more that one "outer" to do, so group |
| 2274 | all the options which match each outer in turn. */ |
| 2275 | for (opt = config_opts; opt; opt = opt->next) |
| 2276 | opt->flags &= ~DHOPT_ENCAP_DONE; |
| 2277 | |
| 2278 | for (opt = config_opts; opt; opt = opt->next) |
| 2279 | if ((opt->flags & (DHOPT_ENCAPSULATE | DHOPT_ENCAP_DONE)) == DHOPT_ENCAPSULATE) |
| 2280 | { |
| 2281 | struct dhcp_opt *o; |
| 2282 | int found = 0; |
| 2283 | |
| 2284 | for (o = config_opts; o; o = o->next) |
| 2285 | { |
| 2286 | o->flags &= ~DHOPT_ENCAP_MATCH; |
| 2287 | if ((o->flags & DHOPT_ENCAPSULATE) && opt->u.encap == o->u.encap) |
| 2288 | { |
| 2289 | o->flags |= DHOPT_ENCAP_DONE; |
| 2290 | if (match_netid(o->netid, netid, 1) && |
| 2291 | (o->flags & DHOPT_FORCE || in_list(req_options, o->u.encap))) |
| 2292 | { |
| 2293 | o->flags |= DHOPT_ENCAP_MATCH; |
| 2294 | found = 1; |
| 2295 | } |
| 2296 | } |
| 2297 | } |
| 2298 | |
| 2299 | if (found) |
| 2300 | do_encap_opts(config_opts, opt->u.encap, DHOPT_ENCAP_MATCH, mess, end, null_term); |
| 2301 | } |
| 2302 | |
| 2303 | /* Must precede pxe_opts, since it overwrites req_options */ |
| 2304 | force_encap = prune_vendor_opts(netid); |
| 2305 | if (in_list(req_options, OPTION_VENDOR_CLASS_OPT)) |
| 2306 | force_encap = 1; |
| 2307 | |
| 2308 | if (pxe_arch != -1) |
| 2309 | { |
| 2310 | pxe_misc(mess, end, uuid); |
| 2311 | config_opts = pxe_opts(pxe_arch, netid); |
| 2312 | } |
| 2313 | |
| 2314 | if (force_encap) |
| 2315 | do_encap_opts(config_opts, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, null_term); |
| 2316 | |
| 2317 | /* restore BOOTP anti-overload hack */ |
| 2318 | if (!req_options || (daemon->options & OPT_NO_OVERRIDE)) |
| 2319 | { |
| 2320 | mess->file[0] = f0; |
| 2321 | mess->sname[0] = s0; |
| 2322 | } |
| 2323 | } |
| 2324 | |
| 2325 | #endif |