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59546085 | 1 | /* dnsmasq is Copyright (c) 2000-2012 Simon Kelley |
9e4abcb5 SK |
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 | |
824af85b SK |
5 | the Free Software Foundation; version 2 dated June, 1991, or |
6 | (at your option) version 3 dated 29 June, 2007. | |
7 | ||
9e4abcb5 SK |
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. | |
824af85b | 12 | |
73a08a24 SK |
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/>. | |
9e4abcb5 SK |
15 | */ |
16 | ||
9e4abcb5 SK |
17 | #include "dnsmasq.h" |
18 | ||
7622fc06 SK |
19 | #ifdef HAVE_DHCP |
20 | ||
5e9e0efb | 21 | #define option_len(opt) ((int)(((unsigned char *)(opt))[1])) |
1a6bca81 | 22 | #define option_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[2u+(unsigned int)(i)])) |
0a852541 | 23 | |
316e2730 SK |
24 | #ifdef HAVE_SCRIPT |
25 | static void add_extradata_data(struct dhcp_lease *lease, unsigned char *data, size_t len, int delim); | |
26 | static void add_extradata_opt(struct dhcp_lease *lease, unsigned char *opt); | |
27 | #endif | |
572b41eb | 28 | |
f2621c7f | 29 | static int sanitise(unsigned char *opt, char *buf); |
73a08a24 | 30 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback); |
824af85b | 31 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt); |
1b7ecd11 SK |
32 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val); |
33 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, | |
34 | int opt, char *string, int null_term); | |
9e4abcb5 | 35 | static struct in_addr option_addr(unsigned char *opt); |
7622fc06 SK |
36 | static unsigned int option_uint(unsigned char *opt, int i, int size); |
37 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, | |
38 | int mac_len, char *interface, char *string, u32 xid); | |
cdeda28f | 39 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize); |
5e9e0efb | 40 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize); |
7de060b0 | 41 | static size_t dhcp_packet_size(struct dhcp_packet *mess, unsigned char *agent_id, unsigned char *real_end); |
7622fc06 | 42 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end); |
1b7ecd11 SK |
43 | static void do_options(struct dhcp_context *context, |
44 | struct dhcp_packet *mess, | |
45 | unsigned char *real_end, | |
46 | unsigned char *req_options, | |
9009d746 | 47 | char *hostname, |
70c5e3e0 | 48 | char *config_domain, |
1b7ecd11 | 49 | struct dhcp_netid *netid, |
7de060b0 | 50 | struct in_addr subnet_addr, |
1b7ecd11 | 51 | unsigned char fqdn_flags, |
7622fc06 | 52 | int null_term, int pxearch, |
8ef5ada2 | 53 | unsigned char *uuid, |
7de060b0 SK |
54 | int vendor_class_len, |
55 | time_t now); | |
7622fc06 | 56 | |
9009d746 | 57 | |
6b01084f | 58 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt); |
8ef5ada2 | 59 | static int do_encap_opts(struct dhcp_opt *opts, int encap, int flag, struct dhcp_packet *mess, unsigned char *end, int null_term); |
7622fc06 SK |
60 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid); |
61 | static int prune_vendor_opts(struct dhcp_netid *netid); | |
316e2730 | 62 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid, struct in_addr local); |
7622fc06 SK |
63 | struct dhcp_boot *find_boot(struct dhcp_netid *netid); |
64 | ||
65 | ||
824af85b | 66 | size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, |
7de060b0 | 67 | size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe, struct in_addr fallback) |
9e4abcb5 | 68 | { |
26128d27 | 69 | unsigned char *opt, *clid = NULL; |
0a852541 | 70 | struct dhcp_lease *ltmp, *lease = NULL; |
a222641c | 71 | struct dhcp_vendor *vendor; |
cdeda28f | 72 | struct dhcp_mac *mac; |
26128d27 | 73 | struct dhcp_netid_list *id_list; |
7622fc06 | 74 | int clid_len = 0, ignore = 0, do_classes = 0, selecting = 0, pxearch = -1; |
824af85b | 75 | struct dhcp_packet *mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
1b7ecd11 | 76 | unsigned char *end = (unsigned char *)(mess + 1); |
7622fc06 | 77 | unsigned char *real_end = (unsigned char *)(mess + 1); |
9009d746 | 78 | char *hostname = NULL, *offer_hostname = NULL, *client_hostname = NULL, *domain = NULL; |
cdeda28f | 79 | int hostname_auth = 0, borken_opt = 0; |
3d8df260 | 80 | unsigned char *req_options = NULL; |
44a2a316 | 81 | char *message = NULL; |
59353a6b | 82 | unsigned int time; |
9e4abcb5 | 83 | struct dhcp_config *config; |
8ef5ada2 | 84 | struct dhcp_netid *netid, *tagif_netid; |
7de060b0 | 85 | struct in_addr subnet_addr, override; |
a84fa1d0 | 86 | unsigned short fuzz = 0; |
3be34541 | 87 | unsigned int mess_type = 0; |
3d8df260 | 88 | unsigned char fqdn_flags = 0; |
7622fc06 | 89 | unsigned char *agent_id = NULL, *uuid = NULL; |
1b7ecd11 | 90 | unsigned char *emac = NULL; |
8ef5ada2 | 91 | int vendor_class_len = 0, emac_len = 0; |
316e2730 | 92 | struct dhcp_netid known_id, iface_id, cpewan_id; |
73a08a24 | 93 | struct dhcp_opt *o; |
7622fc06 | 94 | unsigned char pxe_uuid[17]; |
316e2730 | 95 | unsigned char *oui = NULL, *serial = NULL, *class = NULL; |
3be34541 | 96 | |
1a6bca81 | 97 | subnet_addr.s_addr = override.s_addr = 0; |
9009d746 SK |
98 | |
99 | /* set tag with name == interface */ | |
100 | iface_id.net = iface_name; | |
101 | iface_id.next = NULL; | |
102 | netid = &iface_id; | |
849a8357 | 103 | |
5e9e0efb | 104 | if (mess->op != BOOTREQUEST || mess->hlen > DHCP_CHADDR_MAX) |
33820b7e | 105 | return 0; |
cdeda28f | 106 | |
5e9e0efb | 107 | if (mess->htype == 0 && mess->hlen != 0) |
cdeda28f | 108 | return 0; |
5e9e0efb | 109 | |
3be34541 | 110 | /* check for DHCP rather than BOOTP */ |
bb01cb96 | 111 | if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE, 1))) |
3be34541 | 112 | { |
8ef5ada2 SK |
113 | u32 cookie = htonl(DHCP_COOKIE); |
114 | ||
3be34541 | 115 | /* only insist on a cookie for DHCP. */ |
8ef5ada2 | 116 | if (memcmp(mess->options, &cookie, sizeof(u32)) != 0) |
3be34541 | 117 | return 0; |
8ef5ada2 SK |
118 | |
119 | mess_type = option_uint(opt, 0, 1); | |
120 | ||
5e9e0efb SK |
121 | /* two things to note here: expand_buf may move the packet, |
122 | so reassign mess from daemon->packet. Also, the size | |
123 | sent includes the IP and UDP headers, hence the magic "-28" */ | |
124 | if ((opt = option_find(mess, sz, OPTION_MAXMESSAGE, 2))) | |
125 | { | |
7622fc06 | 126 | size_t size = (size_t)option_uint(opt, 0, 2) - 28; |
5e9e0efb SK |
127 | |
128 | if (size > DHCP_PACKET_MAX) | |
129 | size = DHCP_PACKET_MAX; | |
130 | else if (size < sizeof(struct dhcp_packet)) | |
131 | size = sizeof(struct dhcp_packet); | |
132 | ||
133 | if (expand_buf(&daemon->dhcp_packet, size)) | |
134 | { | |
824af85b | 135 | mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
7622fc06 | 136 | real_end = end = ((unsigned char *)mess) + size; |
5e9e0efb SK |
137 | } |
138 | } | |
139 | ||
3be34541 SK |
140 | /* Some buggy clients set ciaddr when they shouldn't, so clear that here since |
141 | it can affect the context-determination code. */ | |
bb01cb96 | 142 | if ((option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ) || mess_type == DHCPDISCOVER)) |
3be34541 | 143 | mess->ciaddr.s_addr = 0; |
44a2a316 | 144 | |
316e2730 SK |
145 | /* search for device identity from CPEWAN devices, we pass this through to the script */ |
146 | if ((opt = option_find(mess, sz, OPTION_VENDOR_IDENT_OPT, 5))) | |
147 | { | |
148 | unsigned int elen, offset, len = option_len(opt); | |
149 | ||
150 | for (offset = 0; offset < (len - 5); offset += elen + 5) | |
151 | { | |
152 | elen = option_uint(opt, offset + 4 , 1); | |
153 | if (option_uint(opt, offset, 4) == BRDBAND_FORUM_IANA) | |
154 | { | |
155 | unsigned char *x = option_ptr(opt, offset + 5); | |
156 | unsigned char *y = option_ptr(opt, offset + elen + 5); | |
157 | oui = option_find1(x, y, 1, 1); | |
158 | serial = option_find1(x, y, 2, 1); | |
159 | class = option_find1(x, y, 3, 1); | |
160 | ||
161 | /* If TR069-id is present set the tag "cpewan-id" to facilitate echoing | |
162 | the gateway id back. Note that the device class is optional */ | |
163 | if (oui && serial) | |
164 | { | |
165 | cpewan_id.net = "cpewan-id"; | |
166 | cpewan_id.next = netid; | |
167 | netid = &cpewan_id; | |
168 | } | |
169 | break; | |
170 | } | |
171 | } | |
172 | } | |
173 | ||
5e9e0efb SK |
174 | if ((opt = option_find(mess, sz, OPTION_AGENT_ID, 1))) |
175 | { | |
176 | /* Any agent-id needs to be copied back out, verbatim, as the last option | |
177 | in the packet. Here, we shift it to the very end of the buffer, if it doesn't | |
178 | get overwritten, then it will be shuffled back at the end of processing. | |
179 | Note that the incoming options must not be overwritten here, so there has to | |
180 | be enough free space at the end of the packet to copy the option. */ | |
f2621c7f | 181 | unsigned char *sopt; |
5e9e0efb SK |
182 | unsigned int total = option_len(opt) + 2; |
183 | unsigned char *last_opt = option_find(mess, sz, OPTION_END, 0); | |
184 | if (last_opt && last_opt < end - total) | |
185 | { | |
7622fc06 SK |
186 | end -= total; |
187 | agent_id = end; | |
5e9e0efb SK |
188 | memcpy(agent_id, opt, total); |
189 | } | |
190 | ||
191 | /* look for RFC3527 Link selection sub-option */ | |
1a6bca81 | 192 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SUBNET_SELECT, INADDRSZ))) |
f2621c7f | 193 | subnet_addr = option_addr(sopt); |
1a6bca81 SK |
194 | |
195 | /* look for RFC5107 server-identifier-override */ | |
196 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SERVER_OR, INADDRSZ))) | |
197 | override = option_addr(sopt); | |
f2621c7f SK |
198 | |
199 | /* if a circuit-id or remote-is option is provided, exact-match to options. */ | |
200 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) | |
201 | { | |
202 | int search; | |
203 | ||
204 | if (vendor->match_type == MATCH_CIRCUIT) | |
205 | search = SUBOPT_CIRCUIT_ID; | |
206 | else if (vendor->match_type == MATCH_REMOTE) | |
207 | search = SUBOPT_REMOTE_ID; | |
208 | else if (vendor->match_type == MATCH_SUBSCRIBER) | |
209 | search = SUBOPT_SUBSCR_ID; | |
210 | else | |
211 | continue; | |
212 | ||
1a6bca81 | 213 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), search, 1)) && |
f2621c7f | 214 | vendor->len == option_len(sopt) && |
1a6bca81 | 215 | memcmp(option_ptr(sopt, 0), vendor->data, vendor->len) == 0) |
f2621c7f SK |
216 | { |
217 | vendor->netid.next = netid; | |
218 | netid = &vendor->netid; | |
f2621c7f SK |
219 | } |
220 | } | |
5e9e0efb | 221 | } |
f2621c7f | 222 | |
5e9e0efb SK |
223 | /* Check for RFC3011 subnet selector - only if RFC3527 one not present */ |
224 | if (subnet_addr.s_addr == 0 && (opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ))) | |
3be34541 | 225 | subnet_addr = option_addr(opt); |
26128d27 SK |
226 | |
227 | /* If there is no client identifier option, use the hardware address */ | |
bb01cb96 | 228 | if ((opt = option_find(mess, sz, OPTION_CLIENT_ID, 1))) |
26128d27 | 229 | { |
26128d27 | 230 | clid_len = option_len(opt); |
1a6bca81 | 231 | clid = option_ptr(opt, 0); |
26128d27 | 232 | } |
1b7ecd11 | 233 | |
0a852541 | 234 | /* do we have a lease in store? */ |
5e9e0efb | 235 | lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, clid, clid_len); |
0a852541 SK |
236 | |
237 | /* If this request is missing a clid, but we've seen one before, | |
238 | use it again for option matching etc. */ | |
239 | if (lease && !clid && lease->clid) | |
240 | { | |
241 | clid_len = lease->clid_len; | |
242 | clid = lease->clid; | |
243 | } | |
1b7ecd11 SK |
244 | |
245 | /* find mac to use for logging and hashing */ | |
246 | emac = extended_hwaddr(mess->htype, mess->hlen, mess->chaddr, clid_len, clid, &emac_len); | |
44a2a316 | 247 | } |
3be34541 | 248 | |
cdeda28f SK |
249 | for (mac = daemon->dhcp_macs; mac; mac = mac->next) |
250 | if (mac->hwaddr_len == mess->hlen && | |
5e9e0efb SK |
251 | (mac->hwaddr_type == mess->htype || mac->hwaddr_type == 0) && |
252 | memcmp_masked(mac->hwaddr, mess->chaddr, mess->hlen, mac->mask)) | |
cdeda28f | 253 | { |
5e9e0efb SK |
254 | mac->netid.next = netid; |
255 | netid = &mac->netid; | |
cdeda28f | 256 | } |
3d8df260 | 257 | |
0a852541 SK |
258 | /* Determine network for this packet. Our caller will have already linked all the |
259 | contexts which match the addresses of the receiving interface but if the | |
260 | machine has an address already, or came via a relay, or we have a subnet selector, | |
261 | we search again. If we don't have have a giaddr or explicit subnet selector, | |
262 | use the ciaddr. This is necessary because a machine which got a lease via a | |
3d8df260 SK |
263 | relay won't use the relay to renew. If matching a ciaddr fails but we have a context |
264 | from the physical network, continue using that to allow correct DHCPNAK generation later. */ | |
0a852541 SK |
265 | if (mess->giaddr.s_addr || subnet_addr.s_addr || mess->ciaddr.s_addr) |
266 | { | |
3d8df260 | 267 | struct dhcp_context *context_tmp, *context_new = NULL; |
1697269c | 268 | struct in_addr addr; |
3d8df260 SK |
269 | int force = 0; |
270 | ||
271 | if (subnet_addr.s_addr) | |
272 | { | |
273 | addr = subnet_addr; | |
274 | force = 1; | |
275 | } | |
276 | else if (mess->giaddr.s_addr) | |
277 | { | |
278 | addr = mess->giaddr; | |
279 | force = 1; | |
280 | } | |
1697269c SK |
281 | else |
282 | { | |
283 | /* If ciaddr is in the hardware derived set of contexts, leave that unchanged */ | |
284 | addr = mess->ciaddr; | |
285 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) | |
286 | if (context_tmp->netmask.s_addr && | |
287 | is_same_net(addr, context_tmp->start, context_tmp->netmask) && | |
288 | is_same_net(addr, context_tmp->end, context_tmp->netmask)) | |
289 | { | |
290 | context_new = context; | |
291 | break; | |
292 | } | |
293 | } | |
294 | ||
295 | if (!context_new) | |
296 | for (context_tmp = daemon->dhcp; context_tmp; context_tmp = context_tmp->next) | |
7de060b0 SK |
297 | { |
298 | struct in_addr netmask = context_tmp->netmask; | |
299 | ||
300 | /* guess the netmask for relayed networks */ | |
301 | if (!(context_tmp->flags & CONTEXT_NETMASK) && context_tmp->netmask.s_addr == 0) | |
302 | { | |
303 | if (IN_CLASSA(ntohl(context_tmp->start.s_addr)) && IN_CLASSA(ntohl(context_tmp->end.s_addr))) | |
304 | netmask.s_addr = htonl(0xff000000); | |
305 | else if (IN_CLASSB(ntohl(context_tmp->start.s_addr)) && IN_CLASSB(ntohl(context_tmp->end.s_addr))) | |
306 | netmask.s_addr = htonl(0xffff0000); | |
307 | else if (IN_CLASSC(ntohl(context_tmp->start.s_addr)) && IN_CLASSC(ntohl(context_tmp->end.s_addr))) | |
308 | netmask.s_addr = htonl(0xffffff00); | |
309 | } | |
310 | ||
311 | /* This section fills in context mainly when a client which is on a remote (relayed) | |
312 | network renews a lease without using the relay, after dnsmasq has restarted. */ | |
313 | if (netmask.s_addr != 0 && | |
314 | is_same_net(addr, context_tmp->start, netmask) && | |
315 | is_same_net(addr, context_tmp->end, netmask)) | |
316 | { | |
317 | context_tmp->netmask = netmask; | |
318 | if (context_tmp->local.s_addr == 0) | |
319 | context_tmp->local = fallback; | |
320 | if (context_tmp->router.s_addr == 0) | |
321 | context_tmp->router = mess->giaddr; | |
322 | ||
323 | /* fill in missing broadcast addresses for relayed ranges */ | |
324 | if (!(context_tmp->flags & CONTEXT_BRDCAST) && context_tmp->broadcast.s_addr == 0 ) | |
325 | context_tmp->broadcast.s_addr = context_tmp->start.s_addr | ~context_tmp->netmask.s_addr; | |
326 | ||
327 | context_tmp->current = context_new; | |
328 | context_new = context_tmp; | |
329 | } | |
330 | } | |
0a852541 | 331 | |
3d8df260 | 332 | if (context_new || force) |
7de060b0 | 333 | context = context_new; |
0a852541 | 334 | } |
3be34541 SK |
335 | |
336 | if (!context) | |
337 | { | |
7622fc06 | 338 | my_syslog(MS_DHCP | LOG_WARNING, _("no address range available for DHCP request %s %s"), |
f2621c7f SK |
339 | subnet_addr.s_addr ? _("with subnet selector") : _("via"), |
340 | subnet_addr.s_addr ? inet_ntoa(subnet_addr) : (mess->giaddr.s_addr ? inet_ntoa(mess->giaddr) : iface_name)); | |
3be34541 SK |
341 | return 0; |
342 | } | |
f2621c7f | 343 | |
28866e95 | 344 | if (option_bool(OPT_LOG_OPTS)) |
f2621c7f SK |
345 | { |
346 | struct dhcp_context *context_tmp; | |
f2621c7f SK |
347 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) |
348 | { | |
349 | strcpy(daemon->namebuff, inet_ntoa(context_tmp->start)); | |
7622fc06 | 350 | if (context_tmp->flags & (CONTEXT_STATIC | CONTEXT_PROXY)) |
8ef5ada2 | 351 | my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP subnet: %s/%s"), |
7622fc06 | 352 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->netmask)); |
f2621c7f | 353 | else |
8ef5ada2 | 354 | my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP range: %s -- %s"), |
7622fc06 | 355 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->end)); |
f2621c7f SK |
356 | } |
357 | } | |
358 | ||
3be34541 | 359 | mess->op = BOOTREPLY; |
5e9e0efb | 360 | |
cdeda28f SK |
361 | config = find_config(daemon->dhcp_conf, context, clid, clid_len, |
362 | mess->chaddr, mess->hlen, mess->htype, NULL); | |
5aabfc78 SK |
363 | |
364 | /* set "known" tag for known hosts */ | |
365 | if (config) | |
366 | { | |
367 | known_id.net = "known"; | |
368 | known_id.next = netid; | |
369 | netid = &known_id; | |
370 | } | |
26128d27 | 371 | |
316e2730 | 372 | if (mess_type == 0 && !pxe) |
3be34541 SK |
373 | { |
374 | /* BOOTP request */ | |
6b01084f | 375 | struct dhcp_netid id, bootp_id; |
26128d27 | 376 | struct in_addr *logaddr = NULL; |
5e9e0efb SK |
377 | |
378 | /* must have a MAC addr for bootp */ | |
7622fc06 | 379 | if (mess->htype == 0 || mess->hlen == 0 || (context->flags & CONTEXT_PROXY)) |
5e9e0efb | 380 | return 0; |
26128d27 | 381 | |
26128d27 | 382 | if (have_config(config, CONFIG_DISABLE)) |
b8187c80 | 383 | message = _("disabled"); |
26128d27 SK |
384 | |
385 | end = mess->options + 64; /* BOOTP vend area is only 64 bytes */ | |
386 | ||
387 | if (have_config(config, CONFIG_NAME)) | |
9009d746 SK |
388 | { |
389 | hostname = config->hostname; | |
390 | domain = config->domain; | |
391 | } | |
392 | ||
8ef5ada2 | 393 | if (config) |
26128d27 | 394 | { |
8ef5ada2 SK |
395 | struct dhcp_netid_list *list; |
396 | ||
397 | for (list = config->netid; list; list = list->next) | |
398 | { | |
399 | list->list->next = netid; | |
400 | netid = list->list; | |
401 | } | |
26128d27 SK |
402 | } |
403 | ||
404 | /* Match incoming filename field as a netid. */ | |
405 | if (mess->file[0]) | |
406 | { | |
1b7ecd11 SK |
407 | memcpy(daemon->dhcp_buff2, mess->file, sizeof(mess->file)); |
408 | daemon->dhcp_buff2[sizeof(mess->file) + 1] = 0; /* ensure zero term. */ | |
409 | id.net = (char *)daemon->dhcp_buff2; | |
26128d27 SK |
410 | id.next = netid; |
411 | netid = &id; | |
412 | } | |
6b01084f SK |
413 | |
414 | /* Add "bootp" as a tag to allow different options, address ranges etc | |
415 | for BOOTP clients */ | |
416 | bootp_id.net = "bootp"; | |
417 | bootp_id.next = netid; | |
418 | netid = &bootp_id; | |
26128d27 | 419 | |
8ef5ada2 SK |
420 | tagif_netid = run_tag_if(netid); |
421 | ||
26128d27 | 422 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) |
8ef5ada2 | 423 | if (match_netid(id_list->list, tagif_netid, 0)) |
1f15b81d | 424 | message = _("ignored"); |
26128d27 | 425 | |
3d8df260 SK |
426 | if (!message) |
427 | { | |
9009d746 SK |
428 | int nailed = 0; |
429 | ||
3d8df260 SK |
430 | if (have_config(config, CONFIG_ADDR)) |
431 | { | |
9009d746 | 432 | nailed = 1; |
3d8df260 SK |
433 | logaddr = &config->addr; |
434 | mess->yiaddr = config->addr; | |
435 | if ((lease = lease_find_by_addr(config->addr)) && | |
cdeda28f | 436 | (lease->hwaddr_len != mess->hlen || |
5e9e0efb | 437 | lease->hwaddr_type != mess->htype || |
cdeda28f | 438 | memcmp(lease->hwaddr, mess->chaddr, lease->hwaddr_len) != 0)) |
b8187c80 | 439 | message = _("address in use"); |
3d8df260 | 440 | } |
3d8df260 SK |
441 | else |
442 | { | |
cdeda28f | 443 | if (!(lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, NULL, 0)) || |
8ef5ada2 | 444 | !address_available(context, lease->addr, tagif_netid)) |
e17fb629 SK |
445 | { |
446 | if (lease) | |
447 | { | |
448 | /* lease exists, wrong network. */ | |
449 | lease_prune(lease, now); | |
450 | lease = NULL; | |
451 | } | |
8ef5ada2 | 452 | if (!address_allocate(context, &mess->yiaddr, mess->chaddr, mess->hlen, tagif_netid, now)) |
e17fb629 SK |
453 | message = _("no address available"); |
454 | } | |
455 | else | |
3d8df260 | 456 | mess->yiaddr = lease->addr; |
3d8df260 SK |
457 | } |
458 | ||
9009d746 SK |
459 | if (!message && !(context = narrow_context(context, mess->yiaddr, netid))) |
460 | message = _("wrong network"); | |
461 | else if (context->netid.net) | |
462 | { | |
463 | context->netid.next = netid; | |
7de060b0 | 464 | tagif_netid = run_tag_if(&context->netid); |
8ef5ada2 | 465 | } |
7de060b0 | 466 | |
4cb1b320 | 467 | log_tags(tagif_netid, ntohl(mess->xid)); |
8ef5ada2 | 468 | |
9009d746 SK |
469 | if (!message && !nailed) |
470 | { | |
471 | for (id_list = daemon->bootp_dynamic; id_list; id_list = id_list->next) | |
8ef5ada2 | 472 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) |
9009d746 SK |
473 | break; |
474 | if (!id_list) | |
475 | message = _("no address configured"); | |
476 | } | |
477 | ||
7cebd20f SK |
478 | if (!message && |
479 | !lease && | |
52b92f4d | 480 | (!(lease = lease4_allocate(mess->yiaddr)))) |
824af85b | 481 | message = _("no leases left"); |
9009d746 | 482 | |
3d8df260 SK |
483 | if (!message) |
484 | { | |
485 | logaddr = &mess->yiaddr; | |
3d8df260 | 486 | |
cdeda28f | 487 | lease_set_hwaddr(lease, mess->chaddr, NULL, mess->hlen, mess->htype, 0); |
3d8df260 | 488 | if (hostname) |
70c5e3e0 | 489 | lease_set_hostname(lease, hostname, 1, get_domain(lease->addr), domain); |
1a6bca81 SK |
490 | /* infinite lease unless nailed in dhcp-host line. */ |
491 | lease_set_expires(lease, | |
492 | have_config(config, CONFIG_TIME) ? config->lease_time : 0xffffffff, | |
493 | now); | |
824af85b | 494 | lease_set_interface(lease, int_index); |
3d8df260 | 495 | |
7622fc06 | 496 | clear_packet(mess, end); |
9009d746 | 497 | do_options(context, mess, end, NULL, hostname, get_domain(mess->yiaddr), |
70c5e3e0 | 498 | netid, subnet_addr, 0, 0, 0, NULL, 0, now); |
3d8df260 SK |
499 | } |
500 | } | |
501 | ||
7622fc06 | 502 | log_packet("BOOTP", logaddr, mess->chaddr, mess->hlen, iface_name, message, mess->xid); |
1b7ecd11 | 503 | |
7de060b0 | 504 | return message ? 0 : dhcp_packet_size(mess, agent_id, real_end); |
3be34541 | 505 | } |
1b7ecd11 | 506 | |
3d8df260 | 507 | if ((opt = option_find(mess, sz, OPTION_CLIENT_FQDN, 4))) |
9e4abcb5 | 508 | { |
3d8df260 | 509 | /* http://tools.ietf.org/wg/dhc/draft-ietf-dhc-fqdn-option/draft-ietf-dhc-fqdn-option-10.txt */ |
f6b7dc47 | 510 | int len = option_len(opt); |
3d8df260 | 511 | char *pq = daemon->dhcp_buff; |
1a6bca81 | 512 | unsigned char *pp, *op = option_ptr(opt, 0); |
3d8df260 SK |
513 | |
514 | fqdn_flags = *op; | |
515 | len -= 3; | |
516 | op += 3; | |
517 | pp = op; | |
518 | ||
519 | /* Always force update, since the client has no way to do it itself. */ | |
c72daea8 SK |
520 | if (!option_bool(OPT_FQDN_UPDATE) && !(fqdn_flags & 0x01)) |
521 | fqdn_flags |= 0x03; | |
522 | ||
3d8df260 | 523 | fqdn_flags &= ~0x08; |
3d8df260 SK |
524 | |
525 | if (fqdn_flags & 0x04) | |
526 | while (*op != 0 && ((op + (*op) + 1) - pp) < len) | |
527 | { | |
528 | memcpy(pq, op+1, *op); | |
529 | pq += *op; | |
530 | op += (*op)+1; | |
531 | *(pq++) = '.'; | |
532 | } | |
533 | else | |
9e4abcb5 | 534 | { |
3d8df260 | 535 | memcpy(pq, op, len); |
cdeda28f SK |
536 | if (len > 0 && op[len-1] == 0) |
537 | borken_opt = 1; | |
3d8df260 | 538 | pq += len + 1; |
9e4abcb5 | 539 | } |
3d8df260 SK |
540 | |
541 | if (pq != daemon->dhcp_buff) | |
542 | pq--; | |
543 | ||
544 | *pq = 0; | |
545 | ||
1f15b81d | 546 | if (legal_hostname(daemon->dhcp_buff)) |
3d8df260 SK |
547 | offer_hostname = client_hostname = daemon->dhcp_buff; |
548 | } | |
549 | else if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1))) | |
550 | { | |
551 | int len = option_len(opt); | |
1a6bca81 | 552 | memcpy(daemon->dhcp_buff, option_ptr(opt, 0), len); |
cdeda28f SK |
553 | /* Microsoft clients are broken, and need zero-terminated strings |
554 | in options. We detect this state here, and do the same in | |
555 | any options we send */ | |
556 | if (len > 0 && daemon->dhcp_buff[len-1] == 0) | |
557 | borken_opt = 1; | |
558 | else | |
559 | daemon->dhcp_buff[len] = 0; | |
1f15b81d | 560 | if (legal_hostname(daemon->dhcp_buff)) |
3d8df260 SK |
561 | client_hostname = daemon->dhcp_buff; |
562 | } | |
563 | ||
28866e95 | 564 | if (client_hostname && option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
565 | my_syslog(MS_DHCP | LOG_INFO, _("%u client provides name: %s"), ntohl(mess->xid), client_hostname); |
566 | ||
3d8df260 SK |
567 | if (have_config(config, CONFIG_NAME)) |
568 | { | |
569 | hostname = config->hostname; | |
9009d746 | 570 | domain = config->domain; |
b8187c80 | 571 | hostname_auth = 1; |
832af0ba | 572 | /* be careful not to send an OFFER with a hostname not matching the DISCOVER. */ |
3d8df260 | 573 | if (fqdn_flags != 0 || !client_hostname || hostname_isequal(hostname, client_hostname)) |
832af0ba | 574 | offer_hostname = hostname; |
3d8df260 | 575 | } |
5aabfc78 | 576 | else if (client_hostname) |
3d8df260 | 577 | { |
9009d746 | 578 | domain = strip_hostname(client_hostname); |
5aabfc78 SK |
579 | |
580 | if (strlen(client_hostname) != 0) | |
581 | { | |
582 | hostname = client_hostname; | |
583 | if (!config) | |
584 | { | |
585 | /* Search again now we have a hostname. | |
586 | Only accept configs without CLID and HWADDR here, (they won't match) | |
587 | to avoid impersonation by name. */ | |
588 | struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0, | |
589 | mess->chaddr, mess->hlen, | |
590 | mess->htype, hostname); | |
9009d746 | 591 | if (new && !have_config(new, CONFIG_CLID) && !new->hwaddr) |
824af85b SK |
592 | { |
593 | config = new; | |
594 | /* set "known" tag for known hosts */ | |
595 | known_id.net = "known"; | |
596 | known_id.next = netid; | |
597 | netid = &known_id; | |
598 | } | |
5aabfc78 SK |
599 | } |
600 | } | |
9e4abcb5 | 601 | } |
a84fa1d0 | 602 | |
8ef5ada2 | 603 | if (config) |
a84fa1d0 | 604 | { |
8ef5ada2 SK |
605 | struct dhcp_netid_list *list; |
606 | ||
607 | for (list = config->netid; list; list = list->next) | |
608 | { | |
609 | list->list->next = netid; | |
610 | netid = list->list; | |
611 | } | |
a84fa1d0 | 612 | } |
36717eee | 613 | |
73a08a24 SK |
614 | /* dhcp-match. If we have hex-and-wildcards, look for a left-anchored match. |
615 | Otherwise assume the option is an array, and look for a matching element. | |
316e2730 SK |
616 | If no data given, existance of the option is enough. This code handles |
617 | rfc3925 V-I classes too. */ | |
73a08a24 SK |
618 | for (o = daemon->dhcp_match; o; o = o->next) |
619 | { | |
316e2730 SK |
620 | unsigned int len, elen, match = 0; |
621 | size_t offset, o2; | |
622 | ||
623 | if (o->flags & DHOPT_RFC3925) | |
624 | { | |
625 | if (!(opt = option_find(mess, sz, OPTION_VENDOR_IDENT, 5))) | |
626 | continue; | |
627 | ||
628 | for (offset = 0; offset < (option_len(opt) - 5u); offset += len + 5) | |
629 | { | |
630 | len = option_uint(opt, offset + 4 , 1); | |
631 | /* Need to take care that bad data can't run us off the end of the packet */ | |
632 | if ((offset + len + 5 <= (option_len(opt))) && | |
633 | (option_uint(opt, offset, 4) == (unsigned int)o->u.encap)) | |
634 | for (o2 = offset + 5; o2 < offset + len + 5; o2 += elen + 1) | |
635 | { | |
636 | elen = option_uint(opt, o2, 1); | |
637 | if ((o2 + elen + 1 <= option_len(opt)) && | |
638 | (match = match_bytes(o, option_ptr(opt, o2 + 1), elen))) | |
639 | break; | |
640 | } | |
641 | if (match) | |
73a08a24 | 642 | break; |
316e2730 SK |
643 | } |
644 | } | |
645 | else | |
646 | { | |
647 | if (!(opt = option_find(mess, sz, o->opt, 1))) | |
648 | continue; | |
649 | ||
650 | match = match_bytes(o, option_ptr(opt, 0), option_len(opt)); | |
651 | } | |
73a08a24 | 652 | |
316e2730 | 653 | if (match) |
73a08a24 SK |
654 | { |
655 | o->netid->next = netid; | |
656 | netid = o->netid; | |
657 | } | |
658 | } | |
659 | ||
26128d27 SK |
660 | /* user-class options are, according to RFC3004, supposed to contain |
661 | a set of counted strings. Here we check that this is so (by seeing | |
662 | if the counts are consistent with the overall option length) and if | |
663 | so zero the counts so that we don't get spurious matches between | |
664 | the vendor string and the counts. If the lengths don't add up, we | |
665 | assume that the option is a single string and non RFC3004 compliant | |
1697269c SK |
666 | and just do the substring match. dhclient provides these broken options. |
667 | The code, later, which sends user-class data to the lease-change script | |
668 | relies on the transformation done here. | |
669 | */ | |
a222641c | 670 | |
bb01cb96 | 671 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) |
a222641c | 672 | { |
1a6bca81 | 673 | unsigned char *ucp = option_ptr(opt, 0); |
f6b7dc47 | 674 | int tmp, j; |
26128d27 SK |
675 | for (j = 0; j < option_len(opt); j += ucp[j] + 1); |
676 | if (j == option_len(opt)) | |
677 | for (j = 0; j < option_len(opt); j = tmp) | |
678 | { | |
679 | tmp = j + ucp[j] + 1; | |
680 | ucp[j] = 0; | |
681 | } | |
682 | } | |
73a08a24 | 683 | |
26128d27 | 684 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) |
f2621c7f SK |
685 | { |
686 | int mopt; | |
687 | ||
688 | if (vendor->match_type == MATCH_VENDOR) | |
689 | mopt = OPTION_VENDOR_ID; | |
690 | else if (vendor->match_type == MATCH_USER) | |
691 | mopt = OPTION_USER_CLASS; | |
692 | else | |
693 | continue; | |
694 | ||
695 | if ((opt = option_find(mess, sz, mopt, 1))) | |
696 | { | |
697 | int i; | |
698 | for (i = 0; i <= (option_len(opt) - vendor->len); i++) | |
1a6bca81 | 699 | if (memcmp(vendor->data, option_ptr(opt, i), vendor->len) == 0) |
f2621c7f SK |
700 | { |
701 | vendor->netid.next = netid; | |
702 | netid = &vendor->netid; | |
703 | break; | |
704 | } | |
705 | } | |
706 | } | |
707 | ||
8ef5ada2 SK |
708 | /* mark vendor-encapsulated options which match the client-supplied vendor class, |
709 | save client-supplied vendor class */ | |
710 | if ((opt = option_find(mess, sz, OPTION_VENDOR_ID, 1))) | |
711 | { | |
712 | memcpy(daemon->dhcp_buff3, option_ptr(opt, 0), option_len(opt)); | |
713 | vendor_class_len = option_len(opt); | |
714 | } | |
715 | match_vendor_opts(opt, daemon->dhcp_opts); | |
716 | ||
28866e95 | 717 | if (option_bool(OPT_LOG_OPTS)) |
f2621c7f | 718 | { |
8ef5ada2 SK |
719 | if (sanitise(opt, daemon->namebuff)) |
720 | my_syslog(MS_DHCP | LOG_INFO, _("%u vendor class: %s"), ntohl(mess->xid), daemon->namebuff); | |
f2621c7f | 721 | if (sanitise(option_find(mess, sz, OPTION_USER_CLASS, 1), daemon->namebuff)) |
8ef5ada2 | 722 | my_syslog(MS_DHCP | LOG_INFO, _("%u user class: %s"), ntohl(mess->xid), daemon->namebuff); |
f2621c7f SK |
723 | } |
724 | ||
8ef5ada2 SK |
725 | tagif_netid = run_tag_if(netid); |
726 | ||
26128d27 SK |
727 | /* if all the netids in the ignore list are present, ignore this client */ |
728 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) | |
8ef5ada2 | 729 | if (match_netid(id_list->list, tagif_netid, 0)) |
26128d27 | 730 | ignore = 1; |
8ef5ada2 SK |
731 | |
732 | /* If configured, we can override the server-id to be the address of the relay, | |
733 | so that all traffic goes via the relay and can pick up agent-id info. This can be | |
734 | configured for all relays, or by address. */ | |
735 | if (daemon->override && mess->giaddr.s_addr != 0 && override.s_addr == 0) | |
736 | { | |
737 | if (!daemon->override_relays) | |
738 | override = mess->giaddr; | |
739 | else | |
740 | { | |
741 | struct addr_list *l; | |
742 | for (l = daemon->override_relays; l; l = l->next) | |
743 | if (l->addr.s_addr == mess->giaddr.s_addr) | |
744 | break; | |
745 | if (l) | |
746 | override = mess->giaddr; | |
747 | } | |
748 | } | |
749 | ||
a84fa1d0 SK |
750 | /* Can have setting to ignore the client ID for a particular MAC address or hostname */ |
751 | if (have_config(config, CONFIG_NOCLID)) | |
0a852541 SK |
752 | clid = NULL; |
753 | ||
7622fc06 | 754 | /* Check if client is PXE client. */ |
1f15b81d SK |
755 | if (daemon->enable_pxe && |
756 | (opt = option_find(mess, sz, OPTION_VENDOR_ID, 9)) && | |
7622fc06 SK |
757 | strncmp(option_ptr(opt, 0), "PXEClient", 9) == 0) |
758 | { | |
759 | if ((opt = option_find(mess, sz, OPTION_PXE_UUID, 17))) | |
760 | { | |
761 | memcpy(pxe_uuid, option_ptr(opt, 0), 17); | |
762 | uuid = pxe_uuid; | |
763 | } | |
764 | ||
765 | /* Check if this is really a PXE bootserver request, and handle specially if so. */ | |
766 | if ((mess_type == DHCPREQUEST || mess_type == DHCPINFORM) && | |
767 | (opt = option_find(mess, sz, OPTION_VENDOR_CLASS_OPT, 1)) && | |
768 | (opt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_PXE_BOOT_ITEM, 4))) | |
769 | { | |
770 | struct pxe_service *service; | |
771 | int type = option_uint(opt, 0, 2); | |
772 | int layer = option_uint(opt, 2, 2); | |
773 | unsigned char save71[4]; | |
774 | struct dhcp_opt opt71; | |
775 | ||
1f15b81d SK |
776 | if (ignore) |
777 | return 0; | |
778 | ||
7622fc06 SK |
779 | if (layer & 0x8000) |
780 | { | |
781 | my_syslog(MS_DHCP | LOG_ERR, _("PXE BIS not supported")); | |
782 | return 0; | |
783 | } | |
784 | ||
785 | memcpy(save71, option_ptr(opt, 0), 4); | |
786 | ||
787 | for (service = daemon->pxe_services; service; service = service->next) | |
788 | if (service->type == type) | |
789 | break; | |
790 | ||
791 | if (!service || !service->basename) | |
792 | return 0; | |
793 | ||
794 | clear_packet(mess, end); | |
795 | ||
796 | mess->yiaddr = mess->ciaddr; | |
797 | mess->ciaddr.s_addr = 0; | |
798 | if (service->server.s_addr != 0) | |
799 | mess->siaddr = service->server; | |
800 | else | |
801 | mess->siaddr = context->local; | |
802 | ||
803 | snprintf((char *)mess->file, sizeof(mess->file), "%s.%d", service->basename, layer); | |
804 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); | |
805 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); | |
806 | pxe_misc(mess, end, uuid); | |
807 | ||
8ef5ada2 | 808 | prune_vendor_opts(tagif_netid); |
7622fc06 SK |
809 | opt71.val = save71; |
810 | opt71.opt = SUBOPT_PXE_BOOT_ITEM; | |
811 | opt71.len = 4; | |
812 | opt71.flags = DHOPT_VENDOR_MATCH; | |
813 | opt71.netid = NULL; | |
814 | opt71.next = daemon->dhcp_opts; | |
815 | do_encap_opts(&opt71, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); | |
816 | ||
817 | log_packet("PXE", &mess->yiaddr, emac, emac_len, iface_name, (char *)mess->file, mess->xid); | |
4cb1b320 | 818 | log_tags(tagif_netid, ntohl(mess->xid)); |
7de060b0 | 819 | return dhcp_packet_size(mess, agent_id, real_end); |
7622fc06 SK |
820 | } |
821 | ||
822 | if ((opt = option_find(mess, sz, OPTION_ARCH, 2))) | |
823 | { | |
824 | pxearch = option_uint(opt, 0, 2); | |
825 | ||
316e2730 | 826 | /* proxy DHCP here. */ |
28866e95 | 827 | if ((mess_type == DHCPDISCOVER || (pxe && mess_type == DHCPREQUEST))) |
7622fc06 | 828 | { |
28866e95 | 829 | struct dhcp_context *tmp; |
7622fc06 | 830 | |
28866e95 SK |
831 | for (tmp = context; tmp; tmp = tmp->current) |
832 | if ((tmp->flags & CONTEXT_PROXY) && | |
833 | match_netid(tmp->filter, tagif_netid, 1)) | |
834 | break; | |
835 | ||
836 | if (tmp) | |
7622fc06 | 837 | { |
28866e95 SK |
838 | struct dhcp_boot *boot = find_boot(tagif_netid); |
839 | ||
840 | mess->yiaddr.s_addr = 0; | |
841 | if (mess_type == DHCPDISCOVER || mess->ciaddr.s_addr == 0) | |
842 | { | |
843 | mess->ciaddr.s_addr = 0; | |
844 | mess->flags |= htons(0x8000); /* broadcast */ | |
845 | } | |
846 | ||
847 | clear_packet(mess, end); | |
848 | ||
849 | /* Provide the bootfile here, for gPXE, and in case we have no menu items | |
850 | and set discovery_control = 8 */ | |
851 | if (boot) | |
852 | { | |
7de060b0 | 853 | if (boot->next_server.s_addr) |
28866e95 | 854 | mess->siaddr = boot->next_server; |
7de060b0 SK |
855 | else if (boot->tftp_sname) |
856 | mess->siaddr = a_record_from_hosts(boot->tftp_sname, now); | |
28866e95 SK |
857 | |
858 | if (boot->file) | |
859 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); | |
860 | } | |
7622fc06 | 861 | |
28866e95 SK |
862 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, |
863 | mess_type == DHCPDISCOVER ? DHCPOFFER : DHCPACK); | |
864 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); | |
865 | pxe_misc(mess, end, uuid); | |
866 | prune_vendor_opts(tagif_netid); | |
867 | do_encap_opts(pxe_opts(pxearch, tagif_netid, context->local), OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); | |
868 | ||
869 | log_packet("PXE", NULL, emac, emac_len, iface_name, ignore ? "proxy-ignored" : "proxy", mess->xid); | |
4cb1b320 | 870 | log_tags(tagif_netid, ntohl(mess->xid)); |
7de060b0 | 871 | return ignore ? 0 : dhcp_packet_size(mess, agent_id, real_end); |
7622fc06 | 872 | } |
7622fc06 SK |
873 | } |
874 | } | |
875 | } | |
876 | ||
877 | /* if we're just a proxy server, go no further */ | |
316e2730 | 878 | if ((context->flags & CONTEXT_PROXY) || pxe) |
7622fc06 SK |
879 | return 0; |
880 | ||
bb01cb96 | 881 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0))) |
a84fa1d0 | 882 | { |
3d8df260 | 883 | req_options = (unsigned char *)daemon->dhcp_buff2; |
1a6bca81 | 884 | memcpy(req_options, option_ptr(opt, 0), option_len(opt)); |
bb01cb96 | 885 | req_options[option_len(opt)] = OPTION_END; |
a84fa1d0 SK |
886 | } |
887 | ||
3be34541 | 888 | switch (mess_type) |
9e4abcb5 | 889 | { |
44a2a316 | 890 | case DHCPDECLINE: |
bb01cb96 | 891 | if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
73a08a24 | 892 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
44a2a316 | 893 | return 0; |
1a6bca81 | 894 | |
44a2a316 | 895 | /* sanitise any message. Paranoid? Moi? */ |
f2621c7f | 896 | sanitise(option_find(mess, sz, OPTION_MESSAGE, 1), daemon->dhcp_buff); |
44a2a316 | 897 | |
bb01cb96 | 898 | if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
44a2a316 SK |
899 | return 0; |
900 | ||
7622fc06 | 901 | log_packet("DHCPDECLINE", option_ptr(opt, 0), emac, emac_len, iface_name, daemon->dhcp_buff, mess->xid); |
44a2a316 SK |
902 | |
903 | if (lease && lease->addr.s_addr == option_addr(opt).s_addr) | |
904 | lease_prune(lease, now); | |
905 | ||
33820b7e | 906 | if (have_config(config, CONFIG_ADDR) && |
44a2a316 | 907 | config->addr.s_addr == option_addr(opt).s_addr) |
9e4abcb5 | 908 | { |
849a8357 | 909 | prettyprint_time(daemon->dhcp_buff, DECLINE_BACKOFF); |
7622fc06 | 910 | my_syslog(MS_DHCP | LOG_WARNING, _("disabling DHCP static address %s for %s"), |
f2621c7f | 911 | inet_ntoa(config->addr), daemon->dhcp_buff); |
849a8357 SK |
912 | config->flags |= CONFIG_DECLINED; |
913 | config->decline_time = now; | |
9e4abcb5 | 914 | } |
feba5c1d SK |
915 | else |
916 | /* make sure this host gets a different address next time. */ | |
36717eee SK |
917 | for (; context; context = context->current) |
918 | context->addr_epoch++; | |
44a2a316 SK |
919 | |
920 | return 0; | |
921 | ||
922 | case DHCPRELEASE: | |
8ef5ada2 | 923 | if (!(context = narrow_context(context, mess->ciaddr, tagif_netid)) || |
1697269c | 924 | !(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
73a08a24 | 925 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
44a2a316 SK |
926 | return 0; |
927 | ||
44a2a316 SK |
928 | if (lease && lease->addr.s_addr == mess->ciaddr.s_addr) |
929 | lease_prune(lease, now); | |
fd9fa481 | 930 | else |
b8187c80 | 931 | message = _("unknown lease"); |
fd9fa481 | 932 | |
7622fc06 | 933 | log_packet("DHCPRELEASE", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
44a2a316 | 934 | |
9e4abcb5 SK |
935 | return 0; |
936 | ||
937 | case DHCPDISCOVER: | |
5e9e0efb SK |
938 | if (ignore || have_config(config, CONFIG_DISABLE)) |
939 | { | |
b8187c80 | 940 | message = _("ignored"); |
5e9e0efb SK |
941 | opt = NULL; |
942 | } | |
943 | else | |
944 | { | |
945 | struct in_addr addr, conf; | |
946 | ||
1a6bca81 SK |
947 | addr.s_addr = conf.s_addr = 0; |
948 | ||
5e9e0efb SK |
949 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
950 | addr = option_addr(opt); | |
951 | ||
5e9e0efb SK |
952 | if (have_config(config, CONFIG_ADDR)) |
953 | { | |
849a8357 SK |
954 | char *addrs = inet_ntoa(config->addr); |
955 | ||
9009d746 SK |
956 | if ((ltmp = lease_find_by_addr(config->addr)) && |
957 | ltmp != lease && | |
958 | !config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) | |
1b7ecd11 SK |
959 | { |
960 | int len; | |
961 | unsigned char *mac = extended_hwaddr(ltmp->hwaddr_type, ltmp->hwaddr_len, | |
962 | ltmp->hwaddr, ltmp->clid_len, ltmp->clid, &len); | |
7622fc06 | 963 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is leased to %s"), |
5aabfc78 | 964 | addrs, print_mac(daemon->namebuff, mac, len)); |
1b7ecd11 | 965 | } |
5e9e0efb SK |
966 | else |
967 | { | |
968 | struct dhcp_context *tmp; | |
969 | for (tmp = context; tmp; tmp = tmp->current) | |
849a8357 | 970 | if (context->router.s_addr == config->addr.s_addr) |
5e9e0efb SK |
971 | break; |
972 | if (tmp) | |
7622fc06 | 973 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is in use by the server or relay"), addrs); |
849a8357 SK |
974 | else if (have_config(config, CONFIG_DECLINED) && |
975 | difftime(now, config->decline_time) < (float)DECLINE_BACKOFF) | |
7622fc06 | 976 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it was previously declined"), addrs); |
5e9e0efb SK |
977 | else |
978 | conf = config->addr; | |
979 | } | |
980 | } | |
981 | ||
982 | if (conf.s_addr) | |
983 | mess->yiaddr = conf; | |
7622fc06 | 984 | else if (lease && |
8ef5ada2 | 985 | address_available(context, lease->addr, tagif_netid) && |
7622fc06 | 986 | !config_find_by_address(daemon->dhcp_conf, lease->addr)) |
5e9e0efb | 987 | mess->yiaddr = lease->addr; |
8ef5ada2 | 988 | else if (opt && address_available(context, addr, tagif_netid) && !lease_find_by_addr(addr) && |
5e9e0efb SK |
989 | !config_find_by_address(daemon->dhcp_conf, addr)) |
990 | mess->yiaddr = addr; | |
5aabfc78 SK |
991 | else if (emac_len == 0) |
992 | message = _("no unique-id"); | |
8ef5ada2 | 993 | else if (!address_allocate(context, &mess->yiaddr, emac, emac_len, tagif_netid, now)) |
5e9e0efb SK |
994 | message = _("no address available"); |
995 | } | |
996 | ||
7622fc06 | 997 | log_packet("DHCPDISCOVER", opt ? option_ptr(opt, 0) : NULL, emac, emac_len, iface_name, message, mess->xid); |
3d8df260 | 998 | |
8ef5ada2 | 999 | if (message || !(context = narrow_context(context, mess->yiaddr, tagif_netid))) |
33820b7e | 1000 | return 0; |
e17fb629 | 1001 | |
cdeda28f | 1002 | if (context->netid.net) |
59353a6b SK |
1003 | { |
1004 | context->netid.next = netid; | |
7de060b0 | 1005 | tagif_netid = run_tag_if(&context->netid); |
59353a6b | 1006 | } |
7de060b0 | 1007 | |
4cb1b320 | 1008 | log_tags(tagif_netid, ntohl(mess->xid)); |
7de060b0 SK |
1009 | |
1010 | log_packet("DHCPOFFER" , &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); | |
1011 | ||
824af85b | 1012 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
7622fc06 | 1013 | clear_packet(mess, end); |
1b7ecd11 | 1014 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPOFFER); |
73a08a24 | 1015 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1016 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
a84fa1d0 | 1017 | /* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */ |
59353a6b | 1018 | if (time != 0xffffffff) |
a84fa1d0 | 1019 | { |
1b7ecd11 SK |
1020 | option_put(mess, end, OPTION_T1, 4, (time/2)); |
1021 | option_put(mess, end, OPTION_T2, 4, (time*7)/8); | |
a84fa1d0 | 1022 | } |
9009d746 | 1023 | do_options(context, mess, end, req_options, offer_hostname, get_domain(mess->yiaddr), |
70c5e3e0 | 1024 | netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now); |
9e4abcb5 | 1025 | |
7de060b0 | 1026 | return dhcp_packet_size(mess, agent_id, real_end); |
9e4abcb5 SK |
1027 | |
1028 | case DHCPREQUEST: | |
26128d27 SK |
1029 | if (ignore || have_config(config, CONFIG_DISABLE)) |
1030 | return 0; | |
bb01cb96 | 1031 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
9e4abcb5 SK |
1032 | { |
1033 | /* SELECTING or INIT_REBOOT */ | |
44a2a316 | 1034 | mess->yiaddr = option_addr(opt); |
9e4abcb5 | 1035 | |
4011c4e0 SK |
1036 | /* send vendor and user class info for new or recreated lease */ |
1037 | do_classes = 1; | |
1038 | ||
bb01cb96 | 1039 | if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ))) |
3be34541 SK |
1040 | { |
1041 | /* SELECTING */ | |
832af0ba SK |
1042 | selecting = 1; |
1043 | ||
1a6bca81 SK |
1044 | if (override.s_addr != 0) |
1045 | { | |
1046 | if (option_addr(opt).s_addr != override.s_addr) | |
1047 | return 0; | |
1048 | } | |
9009d746 | 1049 | else |
1a6bca81 SK |
1050 | { |
1051 | for (; context; context = context->current) | |
1052 | if (context->local.s_addr == option_addr(opt).s_addr) | |
1053 | break; | |
1054 | ||
1055 | if (!context) | |
9009d746 | 1056 | { |
7de060b0 SK |
1057 | /* Handle very strange configs where clients have more than one route to the server. |
1058 | If a clients idea of its server-id matches any of our DHCP interfaces, we let it pass. | |
1059 | Have to set override to make sure we echo back the correct server-id */ | |
1060 | struct irec *intr; | |
1061 | ||
1062 | enumerate_interfaces(); | |
1063 | ||
1064 | for (intr = daemon->interfaces; intr; intr = intr->next) | |
1065 | if (intr->addr.sa.sa_family == AF_INET && | |
1066 | intr->addr.in.sin_addr.s_addr == option_addr(opt).s_addr && | |
1067 | intr->tftp_ok) | |
1068 | break; | |
1069 | ||
1070 | if (intr) | |
1071 | override = intr->addr.in.sin_addr; | |
1072 | else | |
1073 | { | |
1074 | /* In auth mode, a REQUEST sent to the wrong server | |
1075 | should be faulted, so that the client establishes | |
1076 | communication with us, otherwise, silently ignore. */ | |
1077 | if (!option_bool(OPT_AUTHORITATIVE)) | |
1078 | return 0; | |
1079 | message = _("wrong server-ID"); | |
1080 | } | |
9009d746 | 1081 | } |
1a6bca81 | 1082 | } |
e17fb629 | 1083 | |
3be34541 SK |
1084 | /* If a lease exists for this host and another address, squash it. */ |
1085 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) | |
1086 | { | |
1087 | lease_prune(lease, now); | |
1088 | lease = NULL; | |
1089 | } | |
3be34541 SK |
1090 | } |
1091 | else | |
9e4abcb5 | 1092 | { |
3be34541 | 1093 | /* INIT-REBOOT */ |
28866e95 | 1094 | if (!lease && !option_bool(OPT_AUTHORITATIVE)) |
3be34541 SK |
1095 | return 0; |
1096 | ||
fd9fa481 | 1097 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) |
8ef5ada2 | 1098 | message = _("wrong address"); |
9e4abcb5 | 1099 | } |
44a2a316 SK |
1100 | } |
1101 | else | |
1102 | { | |
1103 | /* RENEWING or REBINDING */ | |
cdeda28f SK |
1104 | /* Check existing lease for this address. |
1105 | We allow it to be missing if dhcp-authoritative mode | |
1106 | as long as we can allocate the lease now - checked below. | |
1107 | This makes for a smooth recovery from a lost lease DB */ | |
1108 | if ((lease && mess->ciaddr.s_addr != lease->addr.s_addr) || | |
28866e95 | 1109 | (!lease && !option_bool(OPT_AUTHORITATIVE))) |
b8187c80 | 1110 | { |
28866e95 SK |
1111 | /* A client rebinding will broadcast the request, so we may see it even |
1112 | if the lease is held by another server. Just ignore it in that case. | |
1113 | If the request is unicast to us, then somethings wrong, NAK */ | |
1114 | if (!unicast_dest) | |
1115 | return 0; | |
b8187c80 SK |
1116 | message = _("lease not found"); |
1117 | /* ensure we broadcast NAK */ | |
1118 | unicast_dest = 0; | |
1119 | } | |
8ef5ada2 | 1120 | |
a84fa1d0 SK |
1121 | /* desynchronise renewals */ |
1122 | fuzz = rand16(); | |
3be34541 | 1123 | mess->yiaddr = mess->ciaddr; |
44a2a316 SK |
1124 | } |
1125 | ||
7622fc06 | 1126 | log_packet("DHCPREQUEST", &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); |
e17fb629 | 1127 | |
dfa666f2 SK |
1128 | if (!message) |
1129 | { | |
1130 | struct dhcp_config *addr_config; | |
5e9e0efb SK |
1131 | struct dhcp_context *tmp = NULL; |
1132 | ||
1133 | if (have_config(config, CONFIG_ADDR)) | |
1134 | for (tmp = context; tmp; tmp = tmp->current) | |
849a8357 | 1135 | if (context->router.s_addr == config->addr.s_addr) |
5e9e0efb | 1136 | break; |
aedef830 | 1137 | |
8ef5ada2 | 1138 | if (!(context = narrow_context(context, mess->yiaddr, tagif_netid))) |
b8187c80 | 1139 | { |
e17fb629 | 1140 | /* If a machine moves networks whilst it has a lease, we catch that here. */ |
b8187c80 SK |
1141 | message = _("wrong network"); |
1142 | /* ensure we broadcast NAK */ | |
1143 | unicast_dest = 0; | |
1144 | } | |
1145 | ||
fd9fa481 | 1146 | /* Check for renewal of a lease which is outside the allowed range. */ |
8ef5ada2 | 1147 | else if (!address_available(context, mess->yiaddr, tagif_netid) && |
dfa666f2 | 1148 | (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr)) |
b8187c80 | 1149 | message = _("address not available"); |
e17fb629 | 1150 | |
dfa666f2 SK |
1151 | /* Check if a new static address has been configured. Be very sure that |
1152 | when the client does DISCOVER, it will get the static address, otherwise | |
1153 | an endless protocol loop will ensue. */ | |
832af0ba | 1154 | else if (!tmp && !selecting && |
5e9e0efb | 1155 | have_config(config, CONFIG_ADDR) && |
849a8357 SK |
1156 | (!have_config(config, CONFIG_DECLINED) || |
1157 | difftime(now, config->decline_time) > (float)DECLINE_BACKOFF) && | |
fd9fa481 SK |
1158 | config->addr.s_addr != mess->yiaddr.s_addr && |
1159 | (!(ltmp = lease_find_by_addr(config->addr)) || ltmp == lease)) | |
b8187c80 | 1160 | message = _("static lease available"); |
dfa666f2 SK |
1161 | |
1162 | /* Check to see if the address is reserved as a static address for another host */ | |
3be34541 | 1163 | else if ((addr_config = config_find_by_address(daemon->dhcp_conf, mess->yiaddr)) && addr_config != config) |
b8187c80 | 1164 | message = _("address reserved"); |
feba5c1d | 1165 | |
9009d746 SK |
1166 | else if (!lease && (ltmp = lease_find_by_addr(mess->yiaddr))) |
1167 | { | |
1168 | /* If a host is configured with more than one MAC address, it's OK to 'nix | |
1169 | a lease from one of it's MACs to give the address to another. */ | |
1170 | if (config && config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) | |
1171 | { | |
7622fc06 | 1172 | my_syslog(MS_DHCP | LOG_INFO, _("abandoning lease to %s of %s"), |
9009d746 SK |
1173 | print_mac(daemon->namebuff, ltmp->hwaddr, ltmp->hwaddr_len), |
1174 | inet_ntoa(ltmp->addr)); | |
1175 | lease = ltmp; | |
1176 | } | |
1697269c | 1177 | else |
9009d746 SK |
1178 | message = _("address in use"); |
1179 | } | |
1180 | ||
1181 | if (!message) | |
1182 | { | |
1183 | if (emac_len == 0) | |
1184 | message = _("no unique-id"); | |
1185 | ||
1186 | else if (!lease) | |
1187 | { | |
52b92f4d | 1188 | if ((lease = lease4_allocate(mess->yiaddr))) |
9009d746 SK |
1189 | do_classes = 1; |
1190 | else | |
1191 | message = _("no leases left"); | |
1192 | } | |
1697269c | 1193 | } |
fd9fa481 | 1194 | } |
1697269c | 1195 | |
44a2a316 SK |
1196 | if (message) |
1197 | { | |
7622fc06 | 1198 | log_packet("DHCPNAK", &mess->yiaddr, emac, emac_len, iface_name, message, mess->xid); |
44a2a316 | 1199 | |
1b7ecd11 | 1200 | mess->yiaddr.s_addr = 0; |
7622fc06 | 1201 | clear_packet(mess, end); |
1b7ecd11 | 1202 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPNAK); |
73a08a24 | 1203 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1204 | option_put_string(mess, end, OPTION_MESSAGE, message, borken_opt); |
b8187c80 SK |
1205 | /* This fixes a problem with the DHCP spec, broadcasting a NAK to a host on |
1206 | a distant subnet which unicast a REQ to us won't work. */ | |
1207 | if (!unicast_dest || mess->giaddr.s_addr != 0 || | |
1208 | mess->ciaddr.s_addr == 0 || is_same_net(context->local, mess->ciaddr, context->netmask)) | |
1209 | { | |
1210 | mess->flags |= htons(0x8000); /* broadcast */ | |
1211 | mess->ciaddr.s_addr = 0; | |
1212 | } | |
44a2a316 | 1213 | } |
fd9fa481 | 1214 | else |
44a2a316 | 1215 | { |
316e2730 SK |
1216 | if (context->netid.net) |
1217 | { | |
1218 | context->netid.next = netid; | |
7de060b0 | 1219 | tagif_netid = run_tag_if( &context->netid); |
316e2730 | 1220 | } |
7de060b0 | 1221 | |
4cb1b320 | 1222 | log_tags(tagif_netid, ntohl(mess->xid)); |
8ef5ada2 | 1223 | |
316e2730 | 1224 | #ifdef HAVE_SCRIPT |
8ef5ada2 SK |
1225 | if (do_classes && daemon->lease_change_command) |
1226 | { | |
1227 | struct dhcp_netid *n; | |
1228 | ||
1229 | if (mess->giaddr.s_addr) | |
1230 | lease->giaddr = mess->giaddr; | |
1231 | ||
4cb1b320 | 1232 | lease->flags |= LEASE_CHANGED; |
8ef5ada2 | 1233 | free(lease->extradata); |
28866e95 | 1234 | lease->extradata = NULL; |
8ef5ada2 SK |
1235 | lease->extradata_size = lease->extradata_len = 0; |
1236 | ||
1237 | add_extradata_opt(lease, option_find(mess, sz, OPTION_VENDOR_ID, 1)); | |
1238 | add_extradata_opt(lease, option_find(mess, sz, OPTION_HOSTNAME, 1)); | |
1239 | add_extradata_opt(lease, oui); | |
1240 | add_extradata_opt(lease, serial); | |
1241 | add_extradata_opt(lease, class); | |
1242 | ||
1243 | /* space-concat tag set */ | |
1244 | if (!tagif_netid) | |
1245 | add_extradata_opt(lease, NULL); | |
1246 | else | |
1247 | for (n = tagif_netid; n; n = n->next) | |
39bec5ff SK |
1248 | { |
1249 | struct dhcp_netid *n1; | |
1250 | /* kill dupes */ | |
1251 | for (n1 = n->next; n1; n1 = n1->next) | |
1252 | if (strcmp(n->net, n1->net) == 0) | |
1253 | break; | |
1254 | if (!n1) | |
1255 | add_extradata_data(lease, (unsigned char *)n->net, strlen(n->net), n->next ? ' ' : 0); | |
1256 | } | |
1257 | ||
8ef5ada2 SK |
1258 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) |
1259 | { | |
1260 | int len = option_len(opt); | |
1261 | unsigned char *ucp = option_ptr(opt, 0); | |
1262 | /* If the user-class option started as counted strings, the first byte will be zero. */ | |
1263 | if (len != 0 && ucp[0] == 0) | |
1264 | ucp++, len--; | |
1265 | add_extradata_data(lease, ucp, len, 0); | |
1266 | } | |
1267 | } | |
316e2730 | 1268 | #endif |
8ef5ada2 SK |
1269 | |
1270 | if (!hostname_auth && (client_hostname = host_from_dns(mess->yiaddr))) | |
1271 | { | |
1272 | domain = get_domain(mess->yiaddr); | |
b8187c80 SK |
1273 | hostname = client_hostname; |
1274 | hostname_auth = 1; | |
1275 | } | |
8ef5ada2 | 1276 | |
824af85b | 1277 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
cdeda28f | 1278 | lease_set_hwaddr(lease, mess->chaddr, clid, mess->hlen, mess->htype, clid_len); |
8ef5ada2 | 1279 | |
832af0ba SK |
1280 | /* if all the netids in the ignore_name list are present, ignore client-supplied name */ |
1281 | if (!hostname_auth) | |
1282 | { | |
1283 | for (id_list = daemon->dhcp_ignore_names; id_list; id_list = id_list->next) | |
8ef5ada2 | 1284 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) |
832af0ba SK |
1285 | break; |
1286 | if (id_list) | |
1287 | hostname = NULL; | |
1288 | } | |
8ef5ada2 SK |
1289 | |
1290 | /* Last ditch, if configured, generate hostname from mac address */ | |
1291 | if (!hostname && emac_len != 0) | |
1292 | { | |
1293 | for (id_list = daemon->dhcp_gen_names; id_list; id_list = id_list->next) | |
1294 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) | |
1295 | break; | |
1296 | if (id_list) | |
1297 | { | |
1298 | int i; | |
1299 | ||
1300 | hostname = daemon->dhcp_buff; | |
1301 | /* buffer is 256 bytes, 3 bytes per octet */ | |
1302 | for (i = 0; (i < emac_len) && (i < 80); i++) | |
1303 | hostname += sprintf(hostname, "%.2x%s", emac[i], (i == emac_len - 1) ? "" : "-"); | |
1304 | hostname = daemon->dhcp_buff; | |
1305 | } | |
1306 | } | |
1307 | ||
fd9fa481 | 1308 | if (hostname) |
70c5e3e0 | 1309 | lease_set_hostname(lease, hostname, hostname_auth, get_domain(lease->addr), domain); |
832af0ba | 1310 | |
5e9e0efb | 1311 | lease_set_expires(lease, time, now); |
824af85b | 1312 | lease_set_interface(lease, int_index); |
1a6bca81 SK |
1313 | |
1314 | if (override.s_addr != 0) | |
1315 | lease->override = override; | |
1316 | else | |
1317 | override = lease->override; | |
1318 | ||
7622fc06 | 1319 | log_packet("DHCPACK", &mess->yiaddr, emac, emac_len, iface_name, hostname, mess->xid); |
832af0ba | 1320 | |
7622fc06 | 1321 | clear_packet(mess, end); |
1b7ecd11 | 1322 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
73a08a24 | 1323 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1324 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
59353a6b | 1325 | if (time != 0xffffffff) |
fd9fa481 | 1326 | { |
59353a6b SK |
1327 | while (fuzz > (time/16)) |
1328 | fuzz = fuzz/2; | |
1b7ecd11 SK |
1329 | option_put(mess, end, OPTION_T1, 4, (time/2) - fuzz); |
1330 | option_put(mess, end, OPTION_T2, 4, ((time/8)*7) - fuzz); | |
fd9fa481 | 1331 | } |
9009d746 | 1332 | do_options(context, mess, end, req_options, hostname, get_domain(mess->yiaddr), |
70c5e3e0 | 1333 | netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now); |
44a2a316 | 1334 | } |
fd9fa481 | 1335 | |
7de060b0 | 1336 | return dhcp_packet_size(mess, agent_id, real_end); |
9e4abcb5 SK |
1337 | |
1338 | case DHCPINFORM: | |
26128d27 | 1339 | if (ignore || have_config(config, CONFIG_DISABLE)) |
b8187c80 | 1340 | message = _("ignored"); |
33820b7e | 1341 | |
7622fc06 | 1342 | log_packet("DHCPINFORM", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
a84fa1d0 | 1343 | |
73a08a24 | 1344 | if (message || mess->ciaddr.s_addr == 0) |
a84fa1d0 | 1345 | return 0; |
73a08a24 SK |
1346 | |
1347 | /* For DHCPINFORM only, cope without a valid context */ | |
8ef5ada2 | 1348 | context = narrow_context(context, mess->ciaddr, tagif_netid); |
9e4abcb5 | 1349 | |
5aabfc78 SK |
1350 | /* Find a least based on IP address if we didn't |
1351 | get one from MAC address/client-d */ | |
1352 | if (!lease && | |
1353 | (lease = lease_find_by_addr(mess->ciaddr)) && | |
1354 | lease->hostname) | |
1355 | hostname = lease->hostname; | |
1356 | ||
8ef5ada2 SK |
1357 | if (!hostname && (hostname = host_from_dns(mess->ciaddr))) |
1358 | domain = get_domain(mess->ciaddr); | |
5aabfc78 | 1359 | |
73a08a24 | 1360 | if (context && context->netid.net) |
59353a6b SK |
1361 | { |
1362 | context->netid.next = netid; | |
4cb1b320 | 1363 | tagif_netid = run_tag_if(&context->netid); |
59353a6b | 1364 | } |
7de060b0 | 1365 | |
4cb1b320 | 1366 | log_tags(tagif_netid, ntohl(mess->xid)); |
7de060b0 SK |
1367 | |
1368 | log_packet("DHCPACK", &mess->ciaddr, emac, emac_len, iface_name, hostname, mess->xid); | |
1a6bca81 | 1369 | |
3927da46 SK |
1370 | if (lease) |
1371 | { | |
1372 | if (override.s_addr != 0) | |
1373 | lease->override = override; | |
1374 | else | |
1375 | override = lease->override; | |
1376 | } | |
1377 | ||
7622fc06 | 1378 | clear_packet(mess, end); |
1b7ecd11 | 1379 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
73a08a24 SK |
1380 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1381 | ||
5aabfc78 SK |
1382 | if (lease) |
1383 | { | |
1384 | if (lease->expires == 0) | |
1385 | time = 0xffffffff; | |
1386 | else | |
1387 | time = (unsigned int)difftime(lease->expires, now); | |
1388 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); | |
824af85b | 1389 | lease_set_interface(lease, int_index); |
5aabfc78 | 1390 | } |
824af85b | 1391 | |
9009d746 | 1392 | do_options(context, mess, end, req_options, hostname, get_domain(mess->ciaddr), |
70c5e3e0 | 1393 | netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now); |
9e4abcb5 | 1394 | |
5aabfc78 | 1395 | *is_inform = 1; /* handle reply differently */ |
7de060b0 | 1396 | return dhcp_packet_size(mess, agent_id, real_end); |
9e4abcb5 SK |
1397 | } |
1398 | ||
1399 | return 0; | |
1400 | } | |
1401 | ||
6b01084f SK |
1402 | /* find a good value to use as MAC address for logging and address-allocation hashing. |
1403 | This is normally just the chaddr field from the DHCP packet, | |
1404 | but eg Firewire will have hlen == 0 and use the client-id instead. | |
1405 | This could be anything, but will normally be EUI64 for Firewire. | |
1406 | We assume that if the first byte of the client-id equals the htype byte | |
1407 | then the client-id is using the usual encoding and use the rest of the | |
1408 | client-id: if not we can use the whole client-id. This should give | |
1409 | sane MAC address logs. */ | |
9009d746 | 1410 | unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, |
6b01084f SK |
1411 | int clid_len, unsigned char *clid, int *len_out) |
1412 | { | |
1413 | if (hwlen == 0 && clid && clid_len > 3) | |
1414 | { | |
1415 | if (clid[0] == hwtype) | |
1416 | { | |
1417 | *len_out = clid_len - 1 ; | |
1418 | return clid + 1; | |
1419 | } | |
1420 | ||
1421 | #if defined(ARPHRD_EUI64) && defined(ARPHRD_IEEE1394) | |
1422 | if (clid[0] == ARPHRD_EUI64 && hwtype == ARPHRD_IEEE1394) | |
1423 | { | |
1424 | *len_out = clid_len - 1 ; | |
1425 | return clid + 1; | |
1426 | } | |
1427 | #endif | |
1428 | ||
1429 | *len_out = clid_len; | |
1430 | return clid; | |
1431 | } | |
1432 | ||
1433 | *len_out = hwlen; | |
1434 | return hwaddr; | |
1435 | } | |
1436 | ||
824af85b | 1437 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt) |
9e4abcb5 | 1438 | { |
5e9e0efb SK |
1439 | unsigned int time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time; |
1440 | ||
1441 | if (opt) | |
1442 | { | |
7622fc06 | 1443 | unsigned int req_time = option_uint(opt, 0, 4); |
5e9e0efb SK |
1444 | if (req_time < 120 ) |
1445 | req_time = 120; /* sanity */ | |
1446 | if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time)) | |
1447 | time = req_time; | |
1448 | } | |
3d8df260 | 1449 | |
5e9e0efb SK |
1450 | return time; |
1451 | } | |
1452 | ||
73a08a24 | 1453 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback) |
1a6bca81 | 1454 | { |
73a08a24 | 1455 | if (override.s_addr != 0) |
1a6bca81 | 1456 | return override; |
7de060b0 | 1457 | else if (context && context->local.s_addr != 0) |
1a6bca81 | 1458 | return context->local; |
73a08a24 SK |
1459 | else |
1460 | return fallback; | |
1a6bca81 SK |
1461 | } |
1462 | ||
f2621c7f SK |
1463 | static int sanitise(unsigned char *opt, char *buf) |
1464 | { | |
1465 | char *p; | |
1466 | int i; | |
1467 | ||
1468 | *buf = 0; | |
1469 | ||
1470 | if (!opt) | |
1471 | return 0; | |
1472 | ||
1a6bca81 | 1473 | p = option_ptr(opt, 0); |
f2621c7f SK |
1474 | |
1475 | for (i = option_len(opt); i > 0; i--) | |
1476 | { | |
1477 | char c = *p++; | |
824af85b | 1478 | if (isprint((int)c)) |
f2621c7f SK |
1479 | *buf++ = c; |
1480 | } | |
1481 | *buf = 0; /* add terminator */ | |
1482 | ||
1483 | return 1; | |
1484 | } | |
1485 | ||
316e2730 SK |
1486 | #ifdef HAVE_SCRIPT |
1487 | static void add_extradata_data(struct dhcp_lease *lease, unsigned char *data, size_t len, int delim) | |
1488 | { | |
1489 | if ((lease->extradata_size - lease->extradata_len) < (len + 1)) | |
1490 | { | |
1491 | size_t newsz = lease->extradata_len + len + 100; | |
1492 | unsigned char *new = whine_malloc(newsz); | |
1493 | ||
1494 | if (!new) | |
1495 | return; | |
1496 | ||
1497 | if (lease->extradata) | |
1498 | { | |
1499 | memcpy(new, lease->extradata, lease->extradata_len); | |
1500 | free(lease->extradata); | |
1501 | } | |
1502 | ||
1503 | lease->extradata = new; | |
1504 | lease->extradata_size = newsz; | |
1505 | } | |
1506 | ||
1507 | if (len != 0) | |
1508 | memcpy(lease->extradata + lease->extradata_len, data, len); | |
1509 | lease->extradata[lease->extradata_len + len] = delim; | |
1510 | lease->extradata_len += len + 1; | |
1511 | } | |
1512 | ||
1513 | static void add_extradata_opt(struct dhcp_lease *lease, unsigned char *opt) | |
1514 | { | |
1515 | if (!opt) | |
1516 | add_extradata_data(lease, NULL, 0, 0); | |
1517 | else | |
1518 | { | |
1519 | size_t i, len = option_len(opt); | |
1520 | unsigned char *ucp = option_ptr(opt, 0); | |
1521 | ||
1522 | /* check for embeded NULLs */ | |
1523 | for (i = 0; i < len; i++) | |
1524 | if (ucp[i] == 0) | |
1525 | { | |
1526 | len = i; | |
1527 | break; | |
1528 | } | |
1529 | ||
1530 | add_extradata_data(lease, ucp, len, 0); | |
1531 | } | |
1532 | } | |
1533 | #endif | |
1534 | ||
5aabfc78 | 1535 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, |
7622fc06 | 1536 | int mac_len, char *interface, char *string, u32 xid) |
5e9e0efb | 1537 | { |
1697269c | 1538 | struct in_addr a; |
7622fc06 | 1539 | |
1697269c SK |
1540 | /* addr may be misaligned */ |
1541 | if (addr) | |
1542 | memcpy(&a, addr, sizeof(a)); | |
1543 | ||
7622fc06 SK |
1544 | print_mac(daemon->namebuff, ext_mac, mac_len); |
1545 | ||
28866e95 | 1546 | if(option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1547 | my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s%s %s", |
1548 | ntohl(xid), | |
1549 | type, | |
1550 | interface, | |
1551 | addr ? inet_ntoa(a) : "", | |
1552 | addr ? " " : "", | |
1553 | daemon->namebuff, | |
1554 | string ? string : ""); | |
1555 | else | |
1556 | my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s%s %s", | |
1557 | type, | |
1558 | interface, | |
1559 | addr ? inet_ntoa(a) : "", | |
1560 | addr ? " " : "", | |
1561 | daemon->namebuff, | |
1562 | string ? string : ""); | |
f2621c7f SK |
1563 | } |
1564 | ||
7622fc06 | 1565 | static void log_options(unsigned char *start, u32 xid) |
f2621c7f SK |
1566 | { |
1567 | while (*start != OPTION_END) | |
1568 | { | |
4cb1b320 | 1569 | char *optname = option_string(AF_INET, start[0], option_ptr(start, 0), option_len(start), daemon->namebuff, MAXDNAME); |
7622fc06 | 1570 | |
4cb1b320 SK |
1571 | my_syslog(MS_DHCP | LOG_INFO, "%u sent size:%3d option:%3d %s %s", |
1572 | ntohl(xid), option_len(start), start[0], optname, daemon->namebuff); | |
f2621c7f SK |
1573 | start += start[1] + 2; |
1574 | } | |
9e4abcb5 SK |
1575 | } |
1576 | ||
1b7ecd11 SK |
1577 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize) |
1578 | { | |
1a6bca81 | 1579 | while (1) |
1b7ecd11 | 1580 | { |
1a6bca81 SK |
1581 | if (p > end) |
1582 | return NULL; | |
1583 | else if (*p == OPTION_END) | |
1584 | return opt == OPTION_END ? p : NULL; | |
1b7ecd11 SK |
1585 | else if (*p == OPTION_PAD) |
1586 | p++; | |
1587 | else | |
1588 | { | |
1589 | int opt_len; | |
1a6bca81 | 1590 | if (p > end - 2) |
1b7ecd11 SK |
1591 | return NULL; /* malformed packet */ |
1592 | opt_len = option_len(p); | |
1a6bca81 | 1593 | if (p > end - (2 + opt_len)) |
1b7ecd11 SK |
1594 | return NULL; /* malformed packet */ |
1595 | if (*p == opt && opt_len >= minsize) | |
1596 | return p; | |
1597 | p += opt_len + 2; | |
1598 | } | |
1599 | } | |
1b7ecd11 SK |
1600 | } |
1601 | ||
1602 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize) | |
1603 | { | |
1604 | unsigned char *ret, *overload; | |
1605 | ||
1606 | /* skip over DHCP cookie; */ | |
1607 | if ((ret = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, opt_type, minsize))) | |
1608 | return ret; | |
1609 | ||
1610 | /* look for overload option. */ | |
1611 | if (!(overload = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, OPTION_OVERLOAD, 1))) | |
1612 | return NULL; | |
1613 | ||
1614 | /* Can we look in filename area ? */ | |
1615 | if ((overload[2] & 1) && | |
1616 | (ret = option_find1(&mess->file[0], &mess->file[128], opt_type, minsize))) | |
1617 | return ret; | |
1618 | ||
1619 | /* finally try sname area */ | |
1620 | if ((overload[2] & 2) && | |
1621 | (ret = option_find1(&mess->sname[0], &mess->sname[64], opt_type, minsize))) | |
1622 | return ret; | |
1623 | ||
1624 | return NULL; | |
1625 | } | |
1626 | ||
4cb1b320 | 1627 | static struct in_addr option_addr(unsigned char *opt) |
9e4abcb5 | 1628 | { |
4cb1b320 | 1629 | /* this worries about unaligned data in the option. */ |
9e4abcb5 SK |
1630 | /* struct in_addr is network byte order */ |
1631 | struct in_addr ret; | |
1632 | ||
4cb1b320 | 1633 | memcpy(&ret, option_ptr(opt, 0), INADDRSZ); |
9e4abcb5 SK |
1634 | |
1635 | return ret; | |
1636 | } | |
1637 | ||
7622fc06 | 1638 | static unsigned int option_uint(unsigned char *opt, int offset, int size) |
9e4abcb5 SK |
1639 | { |
1640 | /* this worries about unaligned data and byte order */ | |
44a2a316 SK |
1641 | unsigned int ret = 0; |
1642 | int i; | |
7622fc06 | 1643 | unsigned char *p = option_ptr(opt, offset); |
9e4abcb5 | 1644 | |
44a2a316 SK |
1645 | for (i = 0; i < size; i++) |
1646 | ret = (ret << 8) | *p++; | |
1647 | ||
1648 | return ret; | |
9e4abcb5 SK |
1649 | } |
1650 | ||
1b7ecd11 | 1651 | static unsigned char *dhcp_skip_opts(unsigned char *start) |
9e4abcb5 | 1652 | { |
1b7ecd11 SK |
1653 | while (*start != 0) |
1654 | start += start[1] + 2; | |
1655 | return start; | |
1656 | } | |
26128d27 | 1657 | |
1b7ecd11 SK |
1658 | /* only for use when building packet: doesn't check for bad data. */ |
1659 | static unsigned char *find_overload(struct dhcp_packet *mess) | |
1660 | { | |
1661 | unsigned char *p = &mess->options[0] + sizeof(u32); | |
26128d27 | 1662 | |
1b7ecd11 | 1663 | while (*p != 0) |
26128d27 | 1664 | { |
1b7ecd11 SK |
1665 | if (*p == OPTION_OVERLOAD) |
1666 | return p; | |
1667 | p += p[1] + 2; | |
26128d27 | 1668 | } |
1b7ecd11 | 1669 | return NULL; |
9e4abcb5 SK |
1670 | } |
1671 | ||
7de060b0 SK |
1672 | static size_t dhcp_packet_size(struct dhcp_packet *mess, unsigned char *agent_id, unsigned char *real_end) |
1673 | { | |
1674 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); | |
1675 | unsigned char *overload; | |
1676 | size_t ret; | |
1677 | ||
1678 | /* move agent_id back down to the end of the packet */ | |
1679 | if (agent_id) | |
1680 | { | |
1681 | memmove(p, agent_id, real_end - agent_id); | |
1682 | p += real_end - agent_id; | |
1683 | memset(p, 0, real_end - p); /* in case of overlap */ | |
1684 | } | |
1685 | ||
1b7ecd11 | 1686 | /* add END options to the regions. */ |
7622fc06 SK |
1687 | overload = find_overload(mess); |
1688 | ||
1689 | if (overload && (option_uint(overload, 0, 1) & 1)) | |
b8187c80 | 1690 | { |
7622fc06 | 1691 | *dhcp_skip_opts(mess->file) = OPTION_END; |
28866e95 | 1692 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1693 | log_options(mess->file, mess->xid); |
1694 | } | |
28866e95 | 1695 | else if (option_bool(OPT_LOG_OPTS) && strlen((char *)mess->file) != 0) |
7622fc06 SK |
1696 | my_syslog(MS_DHCP | LOG_INFO, _("%u bootfile name: %s"), ntohl(mess->xid), (char *)mess->file); |
1697 | ||
1698 | if (overload && (option_uint(overload, 0, 1) & 2)) | |
1699 | { | |
1700 | *dhcp_skip_opts(mess->sname) = OPTION_END; | |
28866e95 | 1701 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 | 1702 | log_options(mess->sname, mess->xid); |
b8187c80 | 1703 | } |
28866e95 | 1704 | else if (option_bool(OPT_LOG_OPTS) && strlen((char *)mess->sname) != 0) |
7622fc06 SK |
1705 | my_syslog(MS_DHCP | LOG_INFO, _("%u server name: %s"), ntohl(mess->xid), (char *)mess->sname); |
1706 | ||
b8187c80 | 1707 | |
1b7ecd11 | 1708 | *p++ = OPTION_END; |
824af85b | 1709 | |
28866e95 | 1710 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1711 | { |
1712 | if (mess->siaddr.s_addr != 0) | |
1713 | my_syslog(MS_DHCP | LOG_INFO, _("%u next server: %s"), ntohl(mess->xid), inet_ntoa(mess->siaddr)); | |
1714 | ||
8ef5ada2 SK |
1715 | if ((mess->flags & htons(0x8000)) && mess->ciaddr.s_addr == 0) |
1716 | my_syslog(MS_DHCP | LOG_INFO, _("%u broadcast response"), ntohl(mess->xid)); | |
1717 | ||
7622fc06 SK |
1718 | log_options(&mess->options[0] + sizeof(u32), mess->xid); |
1719 | } | |
1b7ecd11 SK |
1720 | |
1721 | ret = (size_t)(p - (unsigned char *)mess); | |
1722 | ||
1723 | if (ret < MIN_PACKETSZ) | |
1724 | ret = MIN_PACKETSZ; | |
8ef5ada2 | 1725 | |
1b7ecd11 | 1726 | return ret; |
b8187c80 SK |
1727 | } |
1728 | ||
1b7ecd11 | 1729 | static unsigned char *free_space(struct dhcp_packet *mess, unsigned char *end, int opt, int len) |
9e4abcb5 | 1730 | { |
1b7ecd11 | 1731 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); |
44a2a316 | 1732 | |
1b7ecd11 SK |
1733 | if (p + len + 3 >= end) |
1734 | /* not enough space in options area, try and use overload, if poss */ | |
1735 | { | |
1736 | unsigned char *overload; | |
1737 | ||
1738 | if (!(overload = find_overload(mess)) && | |
1739 | (mess->file[0] == 0 || mess->sname[0] == 0)) | |
1740 | { | |
1741 | /* attempt to overload fname and sname areas, we've reserved space for the | |
1742 | overflow option previuously. */ | |
1743 | overload = p; | |
1744 | *(p++) = OPTION_OVERLOAD; | |
1745 | *(p++) = 1; | |
1746 | } | |
1747 | ||
1748 | p = NULL; | |
1749 | ||
1750 | /* using filename field ? */ | |
1751 | if (overload) | |
1752 | { | |
1753 | if (mess->file[0] == 0) | |
1754 | overload[2] |= 1; | |
1755 | ||
1756 | if (overload[2] & 1) | |
1757 | { | |
1758 | p = dhcp_skip_opts(mess->file); | |
1759 | if (p + len + 3 >= mess->file + sizeof(mess->file)) | |
1760 | p = NULL; | |
1761 | } | |
1762 | ||
1763 | if (!p) | |
1764 | { | |
1765 | /* try to bring sname into play (it may be already) */ | |
1766 | if (mess->sname[0] == 0) | |
1767 | overload[2] |= 2; | |
1768 | ||
1769 | if (overload[2] & 2) | |
1770 | { | |
1771 | p = dhcp_skip_opts(mess->sname); | |
1772 | if (p + len + 3 >= mess->sname + sizeof(mess->file)) | |
1773 | p = NULL; | |
1774 | } | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | if (!p) | |
7622fc06 | 1779 | my_syslog(MS_DHCP | LOG_WARNING, _("cannot send DHCP/BOOTP option %d: no space left in packet"), opt); |
1b7ecd11 SK |
1780 | } |
1781 | ||
1782 | if (p) | |
9e4abcb5 SK |
1783 | { |
1784 | *(p++) = opt; | |
a222641c | 1785 | *(p++) = len; |
9e4abcb5 | 1786 | } |
1b7ecd11 | 1787 | |
9e4abcb5 SK |
1788 | return p; |
1789 | } | |
1b7ecd11 SK |
1790 | |
1791 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val) | |
a222641c | 1792 | { |
1b7ecd11 SK |
1793 | int i; |
1794 | unsigned char *p = free_space(mess, end, opt, len); | |
a222641c | 1795 | |
1b7ecd11 SK |
1796 | if (p) |
1797 | for (i = 0; i < len; i++) | |
1798 | *(p++) = val >> (8 * (len - (i + 1))); | |
a222641c SK |
1799 | } |
1800 | ||
1b7ecd11 SK |
1801 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, int opt, |
1802 | char *string, int null_term) | |
44a2a316 | 1803 | { |
1b7ecd11 | 1804 | unsigned char *p; |
0a852541 | 1805 | size_t len = strlen(string); |
3be34541 | 1806 | |
cdeda28f SK |
1807 | if (null_term && len != 255) |
1808 | len++; | |
1809 | ||
1b7ecd11 SK |
1810 | if ((p = free_space(mess, end, opt, len))) |
1811 | memcpy(p, string, len); | |
44a2a316 | 1812 | } |
1b7ecd11 SK |
1813 | |
1814 | /* return length, note this only does the data part */ | |
73a08a24 | 1815 | static int do_opt(struct dhcp_opt *opt, unsigned char *p, struct dhcp_context *context, int null_term) |
9e4abcb5 | 1816 | { |
1b7ecd11 SK |
1817 | int len = opt->len; |
1818 | ||
1819 | if ((opt->flags & DHOPT_STRING) && null_term && len != 255) | |
1820 | len++; | |
1821 | ||
1822 | if (p && len != 0) | |
9e4abcb5 | 1823 | { |
73a08a24 | 1824 | if (context && (opt->flags & DHOPT_ADDR)) |
1b7ecd11 SK |
1825 | { |
1826 | int j; | |
1827 | struct in_addr *a = (struct in_addr *)opt->val; | |
1828 | for (j = 0; j < opt->len; j+=INADDRSZ, a++) | |
1829 | { | |
1830 | /* zero means "self" (but not in vendorclass options.) */ | |
1831 | if (a->s_addr == 0) | |
73a08a24 | 1832 | memcpy(p, &context->local, INADDRSZ); |
1b7ecd11 SK |
1833 | else |
1834 | memcpy(p, a, INADDRSZ); | |
1835 | p += INADDRSZ; | |
1836 | } | |
9e4abcb5 | 1837 | } |
1b7ecd11 SK |
1838 | else |
1839 | memcpy(p, opt->val, len); | |
1840 | } | |
1841 | return len; | |
9e4abcb5 | 1842 | } |
7622fc06 | 1843 | |
9e4abcb5 SK |
1844 | static int in_list(unsigned char *list, int opt) |
1845 | { | |
1846 | int i; | |
6b01084f SK |
1847 | |
1848 | /* If no requested options, send everything, not nothing. */ | |
a84fa1d0 SK |
1849 | if (!list) |
1850 | return 1; | |
1851 | ||
9e4abcb5 SK |
1852 | for (i = 0; list[i] != OPTION_END; i++) |
1853 | if (opt == list[i]) | |
1854 | return 1; | |
1855 | ||
1856 | return 0; | |
1857 | } | |
1858 | ||
7de060b0 | 1859 | static struct dhcp_opt *option_find2(int opt) |
9e4abcb5 | 1860 | { |
7de060b0 SK |
1861 | struct dhcp_opt *opts; |
1862 | ||
1863 | for (opts = daemon->dhcp_opts; opts; opts = opts->next) | |
1864 | if (opts->opt == opt && (opts->flags & DHOPT_TAGOK)) | |
1865 | return opts; | |
1866 | ||
8ef5ada2 | 1867 | return NULL; |
9e4abcb5 SK |
1868 | } |
1869 | ||
6b01084f SK |
1870 | /* mark vendor-encapsulated options which match the client-supplied or |
1871 | config-supplied vendor class */ | |
1872 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt) | |
1873 | { | |
1874 | for (; dopt; dopt = dopt->next) | |
1875 | { | |
7622fc06 | 1876 | dopt->flags &= ~DHOPT_VENDOR_MATCH; |
73a08a24 | 1877 | if (opt && (dopt->flags & DHOPT_VENDOR)) |
6b01084f SK |
1878 | { |
1879 | int i, len = 0; | |
73a08a24 SK |
1880 | if (dopt->u.vendor_class) |
1881 | len = strlen((char *)dopt->u.vendor_class); | |
6b01084f | 1882 | for (i = 0; i <= (option_len(opt) - len); i++) |
73a08a24 | 1883 | if (len == 0 || memcmp(dopt->u.vendor_class, option_ptr(opt, i), len) == 0) |
6b01084f | 1884 | { |
7622fc06 | 1885 | dopt->flags |= DHOPT_VENDOR_MATCH; |
6b01084f SK |
1886 | break; |
1887 | } | |
1888 | } | |
1889 | } | |
1890 | } | |
1891 | ||
8ef5ada2 SK |
1892 | static int do_encap_opts(struct dhcp_opt *opt, int encap, int flag, |
1893 | struct dhcp_packet *mess, unsigned char *end, int null_term) | |
73a08a24 | 1894 | { |
8ef5ada2 | 1895 | int len, enc_len, ret = 0; |
7622fc06 | 1896 | struct dhcp_opt *start; |
73a08a24 SK |
1897 | unsigned char *p; |
1898 | ||
1899 | /* find size in advance */ | |
7622fc06 SK |
1900 | for (enc_len = 0, start = opt; opt; opt = opt->next) |
1901 | if (opt->flags & flag) | |
73a08a24 SK |
1902 | { |
1903 | int new = do_opt(opt, NULL, NULL, null_term) + 2; | |
8ef5ada2 | 1904 | ret = 1; |
73a08a24 SK |
1905 | if (enc_len + new <= 255) |
1906 | enc_len += new; | |
1907 | else | |
1908 | { | |
1909 | p = free_space(mess, end, encap, enc_len); | |
1910 | for (; start && start != opt; start = start->next) | |
7622fc06 | 1911 | if (p && (start->flags & flag)) |
73a08a24 SK |
1912 | { |
1913 | len = do_opt(start, p + 2, NULL, null_term); | |
1914 | *(p++) = start->opt; | |
1915 | *(p++) = len; | |
1916 | p += len; | |
1917 | } | |
1918 | enc_len = new; | |
1919 | start = opt; | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | if (enc_len != 0 && | |
1924 | (p = free_space(mess, end, encap, enc_len + 1))) | |
1925 | { | |
1926 | for (; start; start = start->next) | |
7622fc06 | 1927 | if (start->flags & flag) |
73a08a24 SK |
1928 | { |
1929 | len = do_opt(start, p + 2, NULL, null_term); | |
1930 | *(p++) = start->opt; | |
1931 | *(p++) = len; | |
1932 | p += len; | |
1933 | } | |
1934 | *p = OPTION_END; | |
1935 | } | |
8ef5ada2 SK |
1936 | |
1937 | return ret; | |
73a08a24 SK |
1938 | } |
1939 | ||
7622fc06 | 1940 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid) |
91dccd09 | 1941 | { |
7622fc06 SK |
1942 | unsigned char *p; |
1943 | ||
1944 | option_put_string(mess, end, OPTION_VENDOR_ID, "PXEClient", 0); | |
1945 | if (uuid && (p = free_space(mess, end, OPTION_PXE_UUID, 17))) | |
1946 | memcpy(p, uuid, 17); | |
1947 | } | |
1948 | ||
1949 | static int prune_vendor_opts(struct dhcp_netid *netid) | |
1950 | { | |
1951 | int force = 0; | |
1952 | struct dhcp_opt *opt; | |
9e038946 | 1953 | |
7622fc06 SK |
1954 | /* prune vendor-encapsulated options based on netid, and look if we're forcing them to be sent */ |
1955 | for (opt = daemon->dhcp_opts; opt; opt = opt->next) | |
1956 | if (opt->flags & DHOPT_VENDOR_MATCH) | |
1957 | { | |
1958 | if (!match_netid(opt->netid, netid, 1)) | |
1959 | opt->flags &= ~DHOPT_VENDOR_MATCH; | |
1960 | else if (opt->flags & DHOPT_FORCE) | |
1961 | force = 1; | |
1962 | } | |
1963 | return force; | |
1964 | } | |
1965 | ||
316e2730 | 1966 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid, struct in_addr local) |
7622fc06 SK |
1967 | { |
1968 | #define NUM_OPTS 4 | |
1969 | ||
1970 | unsigned char *p, *q; | |
1971 | struct pxe_service *service; | |
1972 | static struct dhcp_opt *o, *ret; | |
1973 | int i, j = NUM_OPTS - 1; | |
316e2730 | 1974 | struct in_addr boot_server; |
7622fc06 SK |
1975 | |
1976 | /* We pass back references to these, hence they are declared static */ | |
1977 | static unsigned char discovery_control; | |
1978 | static unsigned char fake_prompt[] = { 0, 'P', 'X', 'E' }; | |
1979 | static struct dhcp_opt *fake_opts = NULL; | |
1980 | ||
316e2730 SK |
1981 | /* Disable multicast, since we don't support it, and broadcast |
1982 | unless we need it */ | |
1983 | discovery_control = 3; | |
7622fc06 SK |
1984 | |
1985 | ret = daemon->dhcp_opts; | |
1986 | ||
1987 | if (!fake_opts && !(fake_opts = whine_malloc(NUM_OPTS * sizeof(struct dhcp_opt)))) | |
1988 | return ret; | |
1989 | ||
1990 | for (i = 0; i < NUM_OPTS; i++) | |
1991 | { | |
1992 | fake_opts[i].flags = DHOPT_VENDOR_MATCH; | |
1993 | fake_opts[i].netid = NULL; | |
1994 | fake_opts[i].next = i == (NUM_OPTS - 1) ? ret : &fake_opts[i+1]; | |
1995 | } | |
1996 | ||
1997 | /* create the data for the PXE_MENU and PXE_SERVERS options. */ | |
1998 | p = (unsigned char *)daemon->dhcp_buff; | |
8ef5ada2 | 1999 | q = (unsigned char *)daemon->dhcp_buff3; |
7622fc06 SK |
2000 | |
2001 | for (i = 0, service = daemon->pxe_services; service; service = service->next) | |
2002 | if (pxe_arch == service->CSA && match_netid(service->netid, netid, 1)) | |
2003 | { | |
2004 | size_t len = strlen(service->menu); | |
2005 | /* opt 43 max size is 255. encapsulated option has type and length | |
2006 | bytes, so its max size is 253. */ | |
2007 | if (p - (unsigned char *)daemon->dhcp_buff + len + 3 < 253) | |
2008 | { | |
2009 | *(p++) = service->type >> 8; | |
2010 | *(p++) = service->type; | |
2011 | *(p++) = len; | |
2012 | memcpy(p, service->menu, len); | |
2013 | p += len; | |
2014 | i++; | |
2015 | } | |
2016 | else | |
2017 | { | |
2018 | toobig: | |
2019 | my_syslog(MS_DHCP | LOG_ERR, _("PXE menu too large")); | |
2020 | return daemon->dhcp_opts; | |
2021 | } | |
2022 | ||
316e2730 SK |
2023 | boot_server = service->basename ? local : service->server; |
2024 | ||
2025 | if (boot_server.s_addr != 0) | |
7622fc06 | 2026 | { |
8ef5ada2 | 2027 | if (q - (unsigned char *)daemon->dhcp_buff3 + 3 + INADDRSZ >= 253) |
316e2730 SK |
2028 | goto toobig; |
2029 | ||
2030 | /* Boot service with known address - give it */ | |
2031 | *(q++) = service->type >> 8; | |
2032 | *(q++) = service->type; | |
2033 | *(q++) = 1; | |
2034 | /* dest misaligned */ | |
2035 | memcpy(q, &boot_server.s_addr, INADDRSZ); | |
2036 | q += INADDRSZ; | |
2037 | } | |
2038 | else if (service->type != 0) | |
2039 | /* We don't know the server for a service type, so we'll | |
2040 | allow the client to broadcast for it */ | |
2041 | discovery_control = 2; | |
7622fc06 SK |
2042 | } |
2043 | ||
2044 | /* if no prompt, wait forever if there's a choice */ | |
2045 | fake_prompt[0] = (i > 1) ? 255 : 0; | |
2046 | ||
2047 | if (i == 0) | |
2048 | discovery_control = 8; /* no menu - just use use mess->filename */ | |
2049 | else | |
2050 | { | |
2051 | ret = &fake_opts[j--]; | |
2052 | ret->len = p - (unsigned char *)daemon->dhcp_buff; | |
2053 | ret->val = (unsigned char *)daemon->dhcp_buff; | |
2054 | ret->opt = SUBOPT_PXE_MENU; | |
2055 | ||
8ef5ada2 | 2056 | if (q - (unsigned char *)daemon->dhcp_buff3 != 0) |
7622fc06 SK |
2057 | { |
2058 | ret = &fake_opts[j--]; | |
8ef5ada2 SK |
2059 | ret->len = q - (unsigned char *)daemon->dhcp_buff3; |
2060 | ret->val = (unsigned char *)daemon->dhcp_buff3; | |
7622fc06 SK |
2061 | ret->opt = SUBOPT_PXE_SERVERS; |
2062 | } | |
2063 | } | |
2064 | ||
2065 | for (o = daemon->dhcp_opts; o; o = o->next) | |
2066 | if ((o->flags & DHOPT_VENDOR_MATCH) && o->opt == SUBOPT_PXE_MENU_PROMPT) | |
2067 | break; | |
2068 | ||
2069 | if (!o) | |
2070 | { | |
2071 | ret = &fake_opts[j--]; | |
2072 | ret->len = sizeof(fake_prompt); | |
2073 | ret->val = fake_prompt; | |
2074 | ret->opt = SUBOPT_PXE_MENU_PROMPT; | |
2075 | } | |
2076 | ||
316e2730 SK |
2077 | ret = &fake_opts[j--]; |
2078 | ret->len = 1; | |
2079 | ret->opt = SUBOPT_PXE_DISCOVERY; | |
2080 | ret->val= &discovery_control; | |
2081 | ||
7622fc06 SK |
2082 | return ret; |
2083 | } | |
2084 | ||
2085 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end) | |
2086 | { | |
1b7ecd11 SK |
2087 | memset(mess->sname, 0, sizeof(mess->sname)); |
2088 | memset(mess->file, 0, sizeof(mess->file)); | |
2089 | memset(&mess->options[0] + sizeof(u32), 0, end - (&mess->options[0] + sizeof(u32))); | |
2090 | mess->siaddr.s_addr = 0; | |
2091 | } | |
cdeda28f | 2092 | |
7622fc06 SK |
2093 | struct dhcp_boot *find_boot(struct dhcp_netid *netid) |
2094 | { | |
2095 | struct dhcp_boot *boot; | |
2096 | ||
2097 | /* decide which dhcp-boot option we're using */ | |
2098 | for (boot = daemon->boot_config; boot; boot = boot->next) | |
2099 | if (match_netid(boot->netid, netid, 0)) | |
2100 | break; | |
2101 | if (!boot) | |
2102 | /* No match, look for one without a netid */ | |
2103 | for (boot = daemon->boot_config; boot; boot = boot->next) | |
2104 | if (match_netid(boot->netid, netid, 1)) | |
2105 | break; | |
2106 | ||
2107 | return boot; | |
9e038946 SK |
2108 | } |
2109 | ||
1b7ecd11 SK |
2110 | static void do_options(struct dhcp_context *context, |
2111 | struct dhcp_packet *mess, | |
7622fc06 | 2112 | unsigned char *end, |
1b7ecd11 | 2113 | unsigned char *req_options, |
9009d746 | 2114 | char *hostname, |
70c5e3e0 | 2115 | char *domain, |
1b7ecd11 SK |
2116 | struct dhcp_netid *netid, |
2117 | struct in_addr subnet_addr, | |
2118 | unsigned char fqdn_flags, | |
7622fc06 | 2119 | int null_term, int pxe_arch, |
8ef5ada2 | 2120 | unsigned char *uuid, |
7de060b0 SK |
2121 | int vendor_class_len, |
2122 | time_t now) | |
1b7ecd11 SK |
2123 | { |
2124 | struct dhcp_opt *opt, *config_opts = daemon->dhcp_opts; | |
2125 | struct dhcp_boot *boot; | |
7622fc06 | 2126 | unsigned char *p; |
f2621c7f | 2127 | int i, len, force_encap = 0; |
1b7ecd11 | 2128 | unsigned char f0 = 0, s0 = 0; |
824af85b | 2129 | int done_file = 0, done_server = 0; |
8ef5ada2 | 2130 | int done_vendor_class = 0; |
7de060b0 SK |
2131 | struct dhcp_netid *tagif; |
2132 | struct dhcp_netid_list *id_list; | |
2133 | ||
4cb1b320 SK |
2134 | /* filter options based on tags, those we want get DHOPT_TAGOK bit set */ |
2135 | tagif = option_filter(netid, &context->netid, config_opts); | |
7de060b0 | 2136 | |
f2621c7f | 2137 | /* logging */ |
28866e95 | 2138 | if (option_bool(OPT_LOG_OPTS) && req_options) |
f2621c7f SK |
2139 | { |
2140 | char *q = daemon->namebuff; | |
2141 | for (i = 0; req_options[i] != OPTION_END; i++) | |
2142 | { | |
4cb1b320 | 2143 | char *s = option_string(AF_INET, req_options[i], NULL, 0, NULL, 0); |
824af85b SK |
2144 | q += snprintf(q, MAXDNAME - (q - daemon->namebuff), |
2145 | "%d%s%s%s", | |
2146 | req_options[i], | |
4cb1b320 SK |
2147 | strlen(s) != 0 ? ":" : "", |
2148 | s, | |
824af85b | 2149 | req_options[i+1] == OPTION_END ? "" : ", "); |
f2621c7f SK |
2150 | if (req_options[i+1] == OPTION_END || (q - daemon->namebuff) > 40) |
2151 | { | |
2152 | q = daemon->namebuff; | |
7622fc06 | 2153 | my_syslog(MS_DHCP | LOG_INFO, _("%u requested options: %s"), ntohl(mess->xid), daemon->namebuff); |
f2621c7f SK |
2154 | } |
2155 | } | |
2156 | } | |
2157 | ||
7de060b0 SK |
2158 | for (id_list = daemon->force_broadcast; id_list; id_list = id_list->next) |
2159 | if ((!id_list->list) || match_netid(id_list->list, netid, 0)) | |
2160 | break; | |
2161 | if (id_list) | |
2162 | mess->flags |= htons(0x8000); /* force broadcast */ | |
2163 | ||
73a08a24 SK |
2164 | if (context) |
2165 | mess->siaddr = context->local; | |
1b7ecd11 SK |
2166 | |
2167 | /* See if we can send the boot stuff as options. | |
2168 | To do this we need a requested option list, BOOTP | |
824af85b SK |
2169 | and very old DHCP clients won't have this, we also |
2170 | provide an manual option to disable it. | |
1b7ecd11 | 2171 | Some PXE ROMs have bugs (surprise!) and need zero-terminated |
7622fc06 | 2172 | names, so we always send those. */ |
7de060b0 | 2173 | if ((boot = find_boot(tagif))) |
91dccd09 | 2174 | { |
1b7ecd11 | 2175 | if (boot->sname) |
824af85b | 2176 | { |
28866e95 | 2177 | if (!option_bool(OPT_NO_OVERRIDE) && |
824af85b SK |
2178 | req_options && |
2179 | in_list(req_options, OPTION_SNAME)) | |
1b7ecd11 | 2180 | option_put_string(mess, end, OPTION_SNAME, boot->sname, 1); |
91dccd09 | 2181 | else |
824af85b | 2182 | strncpy((char *)mess->sname, boot->sname, sizeof(mess->sname)-1); |
91dccd09 | 2183 | } |
1b7ecd11 SK |
2184 | |
2185 | if (boot->file) | |
2186 | { | |
28866e95 | 2187 | if (!option_bool(OPT_NO_OVERRIDE) && |
824af85b SK |
2188 | req_options && |
2189 | in_list(req_options, OPTION_FILENAME)) | |
1b7ecd11 SK |
2190 | option_put_string(mess, end, OPTION_FILENAME, boot->file, 1); |
2191 | else | |
824af85b | 2192 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); |
1b7ecd11 SK |
2193 | } |
2194 | ||
7de060b0 | 2195 | if (boot->next_server.s_addr) |
1b7ecd11 | 2196 | mess->siaddr = boot->next_server; |
7de060b0 SK |
2197 | else if (boot->tftp_sname) |
2198 | mess->siaddr = a_record_from_hosts(boot->tftp_sname, now); | |
91dccd09 | 2199 | } |
824af85b SK |
2200 | else |
2201 | /* Use the values of the relevant options if no dhcp-boot given and | |
1f15b81d SK |
2202 | they're not explicitly asked for as options. OPTION_END is used |
2203 | as an internal way to specify siaddr without using dhcp-boot, for use in | |
2204 | dhcp-optsfile. */ | |
824af85b | 2205 | { |
8ef5ada2 | 2206 | if ((!req_options || !in_list(req_options, OPTION_FILENAME)) && |
7de060b0 | 2207 | (opt = option_find2(OPTION_FILENAME)) && !(opt->flags & DHOPT_FORCE)) |
824af85b SK |
2208 | { |
2209 | strncpy((char *)mess->file, (char *)opt->val, sizeof(mess->file)-1); | |
2210 | done_file = 1; | |
2211 | } | |
7622fc06 | 2212 | |
824af85b | 2213 | if ((!req_options || !in_list(req_options, OPTION_SNAME)) && |
7de060b0 | 2214 | (opt = option_find2(OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE)) |
824af85b SK |
2215 | { |
2216 | strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess->sname)-1); | |
2217 | done_server = 1; | |
2218 | } | |
1f15b81d | 2219 | |
7de060b0 | 2220 | if ((opt = option_find2(OPTION_END))) |
1f15b81d | 2221 | mess->siaddr.s_addr = ((struct in_addr *)opt->val)->s_addr; |
824af85b | 2222 | } |
7622fc06 | 2223 | |
1b7ecd11 SK |
2224 | /* We don't want to do option-overload for BOOTP, so make the file and sname |
2225 | fields look like they are in use, even when they aren't. This gets restored | |
2226 | at the end of this function. */ | |
2227 | ||
28866e95 | 2228 | if (!req_options || option_bool(OPT_NO_OVERRIDE)) |
91dccd09 | 2229 | { |
1b7ecd11 SK |
2230 | f0 = mess->file[0]; |
2231 | mess->file[0] = 1; | |
2232 | s0 = mess->sname[0]; | |
2233 | mess->sname[0] = 1; | |
91dccd09 | 2234 | } |
1b7ecd11 SK |
2235 | |
2236 | /* At this point, if mess->sname or mess->file are zeroed, they are available | |
2237 | for option overload, reserve space for the overload option. */ | |
2238 | if (mess->file[0] == 0 || mess->sname[0] == 0) | |
2239 | end -= 3; | |
91dccd09 | 2240 | |
3be34541 SK |
2241 | /* rfc3011 says this doesn't need to be in the requested options list. */ |
2242 | if (subnet_addr.s_addr) | |
1b7ecd11 | 2243 | option_put(mess, end, OPTION_SUBNET_SELECT, INADDRSZ, ntohl(subnet_addr.s_addr)); |
9e4abcb5 | 2244 | |
73a08a24 SK |
2245 | /* replies to DHCPINFORM may not have a valid context */ |
2246 | if (context) | |
2247 | { | |
7de060b0 | 2248 | if (!option_find2(OPTION_NETMASK)) |
73a08a24 | 2249 | option_put(mess, end, OPTION_NETMASK, INADDRSZ, ntohl(context->netmask.s_addr)); |
9e4abcb5 | 2250 | |
73a08a24 SK |
2251 | /* May not have a "guessed" broadcast address if we got no packets via a relay |
2252 | from this net yet (ie just unicast renewals after a restart */ | |
2253 | if (context->broadcast.s_addr && | |
7de060b0 | 2254 | !option_find2(OPTION_BROADCAST)) |
73a08a24 SK |
2255 | option_put(mess, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr)); |
2256 | ||
2257 | /* Same comments as broadcast apply, and also may not be able to get a sensible | |
2258 | default when using subnet select. User must configure by steam in that case. */ | |
2259 | if (context->router.s_addr && | |
2260 | in_list(req_options, OPTION_ROUTER) && | |
7de060b0 | 2261 | !option_find2(OPTION_ROUTER)) |
73a08a24 SK |
2262 | option_put(mess, end, OPTION_ROUTER, INADDRSZ, ntohl(context->router.s_addr)); |
2263 | ||
2264 | if (in_list(req_options, OPTION_DNSSERVER) && | |
7de060b0 | 2265 | !option_find2(OPTION_DNSSERVER)) |
73a08a24 SK |
2266 | option_put(mess, end, OPTION_DNSSERVER, INADDRSZ, ntohl(context->local.s_addr)); |
2267 | } | |
2268 | ||
9009d746 | 2269 | if (domain && in_list(req_options, OPTION_DOMAINNAME) && |
7de060b0 | 2270 | !option_find2(OPTION_DOMAINNAME)) |
9009d746 | 2271 | option_put_string(mess, end, OPTION_DOMAINNAME, domain, null_term); |
9e4abcb5 | 2272 | |
824af85b | 2273 | /* Note that we ignore attempts to set the fqdn using --dhc-option=81,<name> */ |
3d8df260 SK |
2274 | if (hostname) |
2275 | { | |
824af85b | 2276 | if (in_list(req_options, OPTION_HOSTNAME) && |
7de060b0 | 2277 | !option_find2(OPTION_HOSTNAME)) |
1b7ecd11 | 2278 | option_put_string(mess, end, OPTION_HOSTNAME, hostname, null_term); |
3d8df260 SK |
2279 | |
2280 | if (fqdn_flags != 0) | |
2281 | { | |
73a08a24 SK |
2282 | len = strlen(hostname) + 3; |
2283 | ||
3d8df260 SK |
2284 | if (fqdn_flags & 0x04) |
2285 | len += 2; | |
cdeda28f SK |
2286 | else if (null_term) |
2287 | len++; | |
2288 | ||
9009d746 SK |
2289 | if (domain) |
2290 | len += strlen(domain) + 1; | |
3d8df260 | 2291 | |
1b7ecd11 | 2292 | if ((p = free_space(mess, end, OPTION_CLIENT_FQDN, len))) |
3d8df260 | 2293 | { |
3d8df260 SK |
2294 | *(p++) = fqdn_flags; |
2295 | *(p++) = 255; | |
2296 | *(p++) = 255; | |
2297 | ||
2298 | if (fqdn_flags & 0x04) | |
2299 | { | |
2300 | p = do_rfc1035_name(p, hostname); | |
9009d746 SK |
2301 | if (domain) |
2302 | p = do_rfc1035_name(p, domain); | |
3d8df260 SK |
2303 | *p++ = 0; |
2304 | } | |
2305 | else | |
2306 | { | |
2307 | memcpy(p, hostname, strlen(hostname)); | |
2308 | p += strlen(hostname); | |
9009d746 | 2309 | if (domain) |
3d8df260 SK |
2310 | { |
2311 | *(p++) = '.'; | |
9009d746 SK |
2312 | memcpy(p, domain, strlen(domain)); |
2313 | p += strlen(domain); | |
cdeda28f SK |
2314 | } |
2315 | if (null_term) | |
2316 | *(p++) = 0; | |
3d8df260 SK |
2317 | } |
2318 | } | |
2319 | } | |
2320 | } | |
2321 | ||
6b01084f | 2322 | for (opt = config_opts; opt; opt = opt->next) |
9e4abcb5 | 2323 | { |
824af85b SK |
2324 | int optno = opt->opt; |
2325 | ||
7de060b0 SK |
2326 | /* netids match and not encapsulated? */ |
2327 | if (!(opt->flags & DHOPT_TAGOK)) | |
2328 | continue; | |
2329 | ||
6b01084f | 2330 | /* was it asked for, or are we sending it anyway? */ |
824af85b | 2331 | if (!(opt->flags & DHOPT_FORCE) && !in_list(req_options, optno)) |
6b01084f SK |
2332 | continue; |
2333 | ||
2334 | /* prohibit some used-internally options */ | |
824af85b SK |
2335 | if (optno == OPTION_CLIENT_FQDN || |
2336 | optno == OPTION_MAXMESSAGE || | |
2337 | optno == OPTION_OVERLOAD || | |
2338 | optno == OPTION_PAD || | |
2339 | optno == OPTION_END) | |
2340 | continue; | |
2341 | ||
2342 | if (optno == OPTION_SNAME && done_server) | |
2343 | continue; | |
2344 | ||
2345 | if (optno == OPTION_FILENAME && done_file) | |
6b01084f SK |
2346 | continue; |
2347 | ||
33820b7e SK |
2348 | /* For the options we have default values on |
2349 | dhc-option=<optionno> means "don't include this option" | |
2350 | not "include a zero-length option" */ | |
2351 | if (opt->len == 0 && | |
824af85b SK |
2352 | (optno == OPTION_NETMASK || |
2353 | optno == OPTION_BROADCAST || | |
2354 | optno == OPTION_ROUTER || | |
2355 | optno == OPTION_DNSSERVER || | |
2356 | optno == OPTION_DOMAINNAME || | |
2357 | optno == OPTION_HOSTNAME)) | |
33820b7e | 2358 | continue; |
7622fc06 SK |
2359 | |
2360 | /* vendor-class comes from elsewhere for PXE */ | |
2361 | if (pxe_arch != -1 && optno == OPTION_VENDOR_ID) | |
2362 | continue; | |
824af85b | 2363 | |
7622fc06 | 2364 | /* always force null-term for filename and servername - buggy PXE again. */ |
73a08a24 | 2365 | len = do_opt(opt, NULL, context, |
824af85b | 2366 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
91dccd09 | 2367 | |
824af85b | 2368 | if ((p = free_space(mess, end, optno, len))) |
6b01084f | 2369 | { |
73a08a24 | 2370 | do_opt(opt, p, context, |
824af85b SK |
2371 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
2372 | ||
6b01084f SK |
2373 | /* If we send a vendor-id, revisit which vendor-ops we consider |
2374 | it appropriate to send. */ | |
824af85b | 2375 | if (optno == OPTION_VENDOR_ID) |
8ef5ada2 SK |
2376 | { |
2377 | match_vendor_opts(p - 2, config_opts); | |
2378 | done_vendor_class = 1; | |
2379 | } | |
6b01084f SK |
2380 | } |
2381 | } | |
91dccd09 | 2382 | |
73a08a24 SK |
2383 | /* Now send options to be encapsulated in arbitrary options, |
2384 | eg dhcp-option=encap:172,17,....... | |
4cb1b320 SK |
2385 | Also handle vendor-identifying vendor-encapsulated options, |
2386 | dhcp-option = vi-encap:13,17,....... | |
73a08a24 SK |
2387 | The may be more that one "outer" to do, so group |
2388 | all the options which match each outer in turn. */ | |
7622fc06 SK |
2389 | for (opt = config_opts; opt; opt = opt->next) |
2390 | opt->flags &= ~DHOPT_ENCAP_DONE; | |
2391 | ||
73a08a24 | 2392 | for (opt = config_opts; opt; opt = opt->next) |
316e2730 SK |
2393 | { |
2394 | int flags; | |
2395 | ||
2396 | if ((flags = (opt->flags & (DHOPT_ENCAPSULATE | DHOPT_RFC3925)))) | |
2397 | { | |
2398 | int found = 0; | |
2399 | struct dhcp_opt *o; | |
2400 | ||
2401 | if (opt->flags & DHOPT_ENCAP_DONE) | |
2402 | continue; | |
2403 | ||
2404 | for (len = 0, o = config_opts; o; o = o->next) | |
2405 | { | |
2406 | int outer = flags & DHOPT_ENCAPSULATE ? o->u.encap : OPTION_VENDOR_IDENT_OPT; | |
2407 | ||
2408 | o->flags &= ~DHOPT_ENCAP_MATCH; | |
2409 | ||
2410 | if (!(o->flags & flags) || opt->u.encap != o->u.encap) | |
2411 | continue; | |
2412 | ||
2413 | o->flags |= DHOPT_ENCAP_DONE; | |
7de060b0 | 2414 | if (match_netid(o->netid, tagif, 1) && |
316e2730 SK |
2415 | ((o->flags & DHOPT_FORCE) || in_list(req_options, outer))) |
2416 | { | |
2417 | o->flags |= DHOPT_ENCAP_MATCH; | |
2418 | found = 1; | |
2419 | len += do_opt(o, NULL, NULL, 0) + 2; | |
2420 | } | |
2421 | } | |
2422 | ||
2423 | if (found) | |
2424 | { | |
2425 | if (flags & DHOPT_ENCAPSULATE) | |
2426 | do_encap_opts(config_opts, opt->u.encap, DHOPT_ENCAP_MATCH, mess, end, null_term); | |
2427 | else if (len > 250) | |
2428 | my_syslog(MS_DHCP | LOG_WARNING, _("cannot send RFC3925 option: too many options for enterprise number %d"), opt->u.encap); | |
2429 | else if ((p = free_space(mess, end, OPTION_VENDOR_IDENT_OPT, len + 5))) | |
2430 | { | |
2431 | int swap_ent = htonl(opt->u.encap); | |
2432 | memcpy(p, &swap_ent, 4); | |
2433 | p += 4; | |
2434 | *(p++) = len; | |
2435 | for (o = config_opts; o; o = o->next) | |
2436 | if (o->flags & DHOPT_ENCAP_MATCH) | |
2437 | { | |
2438 | len = do_opt(o, p + 2, NULL, 0); | |
2439 | *(p++) = o->opt; | |
2440 | *(p++) = len; | |
2441 | p += len; | |
2442 | } | |
2443 | } | |
2444 | } | |
2445 | } | |
2446 | } | |
73a08a24 | 2447 | |
7de060b0 | 2448 | force_encap = prune_vendor_opts(tagif); |
8ef5ada2 | 2449 | |
316e2730 | 2450 | if (context && pxe_arch != -1) |
7622fc06 SK |
2451 | { |
2452 | pxe_misc(mess, end, uuid); | |
7de060b0 | 2453 | config_opts = pxe_opts(pxe_arch, tagif, context->local); |
7622fc06 | 2454 | } |
9e4abcb5 | 2455 | |
8ef5ada2 SK |
2456 | if ((force_encap || in_list(req_options, OPTION_VENDOR_CLASS_OPT)) && |
2457 | do_encap_opts(config_opts, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, null_term) && | |
2458 | pxe_arch == -1 && !done_vendor_class && vendor_class_len != 0 && | |
2459 | (p = free_space(mess, end, OPTION_VENDOR_ID, vendor_class_len))) | |
2460 | /* If we send vendor encapsulated options, and haven't already sent option 60, | |
2461 | echo back the value we got from the client. */ | |
2462 | memcpy(p, daemon->dhcp_buff3, vendor_class_len); | |
2463 | ||
7622fc06 | 2464 | /* restore BOOTP anti-overload hack */ |
28866e95 | 2465 | if (!req_options || option_bool(OPT_NO_OVERRIDE)) |
1b7ecd11 SK |
2466 | { |
2467 | mess->file[0] = f0; | |
2468 | mess->sname[0] = s0; | |
2469 | } | |
2470 | } | |
9e4abcb5 | 2471 | |
7622fc06 SK |
2472 | #endif |
2473 | ||
2474 | ||
2475 | ||
2476 | ||
2477 | ||
2478 | ||
2479 |