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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 | ||
0a852541 | 21 | #define have_config(config, mask) ((config) && ((config)->flags & (mask))) |
5e9e0efb | 22 | #define option_len(opt) ((int)(((unsigned char *)(opt))[1])) |
1a6bca81 | 23 | #define option_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[2u+(unsigned int)(i)])) |
0a852541 | 24 | |
316e2730 SK |
25 | #ifdef HAVE_SCRIPT |
26 | static void add_extradata_data(struct dhcp_lease *lease, unsigned char *data, size_t len, int delim); | |
27 | static void add_extradata_opt(struct dhcp_lease *lease, unsigned char *opt); | |
28 | #endif | |
572b41eb | 29 | |
316e2730 | 30 | static int match_bytes(struct dhcp_opt *o, unsigned char *p, int len); |
f2621c7f | 31 | static int sanitise(unsigned char *opt, char *buf); |
73a08a24 | 32 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback); |
824af85b | 33 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt); |
1b7ecd11 SK |
34 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val); |
35 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, | |
36 | int opt, char *string, int null_term); | |
9e4abcb5 | 37 | static struct in_addr option_addr(unsigned char *opt); |
7622fc06 SK |
38 | static struct in_addr option_addr_arr(unsigned char *opt, int offset); |
39 | static unsigned int option_uint(unsigned char *opt, int i, int size); | |
40 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, | |
41 | int mac_len, char *interface, char *string, u32 xid); | |
cdeda28f | 42 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize); |
5e9e0efb | 43 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize); |
7de060b0 SK |
44 | static void log_tags(struct dhcp_netid *netid, struct dhcp_packet *mess); |
45 | static size_t dhcp_packet_size(struct dhcp_packet *mess, unsigned char *agent_id, unsigned char *real_end); | |
7622fc06 | 46 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end); |
1b7ecd11 SK |
47 | static void do_options(struct dhcp_context *context, |
48 | struct dhcp_packet *mess, | |
49 | unsigned char *real_end, | |
50 | unsigned char *req_options, | |
9009d746 SK |
51 | char *hostname, |
52 | char *domain, char *config_domain, | |
1b7ecd11 | 53 | struct dhcp_netid *netid, |
7de060b0 | 54 | struct in_addr subnet_addr, |
1b7ecd11 | 55 | unsigned char fqdn_flags, |
7622fc06 | 56 | int null_term, int pxearch, |
8ef5ada2 | 57 | unsigned char *uuid, |
7de060b0 SK |
58 | int vendor_class_len, |
59 | time_t now); | |
7622fc06 | 60 | |
9009d746 | 61 | |
6b01084f | 62 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt); |
8ef5ada2 | 63 | 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 |
64 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid); |
65 | static int prune_vendor_opts(struct dhcp_netid *netid); | |
316e2730 | 66 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid, struct in_addr local); |
7622fc06 SK |
67 | struct dhcp_boot *find_boot(struct dhcp_netid *netid); |
68 | ||
69 | ||
824af85b | 70 | size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, |
7de060b0 | 71 | size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe, struct in_addr fallback) |
9e4abcb5 | 72 | { |
26128d27 | 73 | unsigned char *opt, *clid = NULL; |
0a852541 | 74 | struct dhcp_lease *ltmp, *lease = NULL; |
a222641c | 75 | struct dhcp_vendor *vendor; |
cdeda28f | 76 | struct dhcp_mac *mac; |
26128d27 | 77 | struct dhcp_netid_list *id_list; |
7622fc06 | 78 | int clid_len = 0, ignore = 0, do_classes = 0, selecting = 0, pxearch = -1; |
824af85b | 79 | struct dhcp_packet *mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
1b7ecd11 | 80 | unsigned char *end = (unsigned char *)(mess + 1); |
7622fc06 | 81 | unsigned char *real_end = (unsigned char *)(mess + 1); |
9009d746 | 82 | char *hostname = NULL, *offer_hostname = NULL, *client_hostname = NULL, *domain = NULL; |
cdeda28f | 83 | int hostname_auth = 0, borken_opt = 0; |
3d8df260 | 84 | unsigned char *req_options = NULL; |
44a2a316 | 85 | char *message = NULL; |
59353a6b | 86 | unsigned int time; |
9e4abcb5 | 87 | struct dhcp_config *config; |
8ef5ada2 | 88 | struct dhcp_netid *netid, *tagif_netid; |
7de060b0 | 89 | struct in_addr subnet_addr, override; |
a84fa1d0 | 90 | unsigned short fuzz = 0; |
3be34541 | 91 | unsigned int mess_type = 0; |
3d8df260 | 92 | unsigned char fqdn_flags = 0; |
7622fc06 | 93 | unsigned char *agent_id = NULL, *uuid = NULL; |
1b7ecd11 | 94 | unsigned char *emac = NULL; |
8ef5ada2 | 95 | int vendor_class_len = 0, emac_len = 0; |
316e2730 | 96 | struct dhcp_netid known_id, iface_id, cpewan_id; |
73a08a24 | 97 | struct dhcp_opt *o; |
7622fc06 | 98 | unsigned char pxe_uuid[17]; |
316e2730 | 99 | unsigned char *oui = NULL, *serial = NULL, *class = NULL; |
3be34541 | 100 | |
1a6bca81 | 101 | subnet_addr.s_addr = override.s_addr = 0; |
9009d746 SK |
102 | |
103 | /* set tag with name == interface */ | |
104 | iface_id.net = iface_name; | |
105 | iface_id.next = NULL; | |
106 | netid = &iface_id; | |
849a8357 | 107 | |
5e9e0efb | 108 | if (mess->op != BOOTREQUEST || mess->hlen > DHCP_CHADDR_MAX) |
33820b7e | 109 | return 0; |
cdeda28f | 110 | |
5e9e0efb | 111 | if (mess->htype == 0 && mess->hlen != 0) |
cdeda28f | 112 | return 0; |
5e9e0efb | 113 | |
3be34541 | 114 | /* check for DHCP rather than BOOTP */ |
bb01cb96 | 115 | if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE, 1))) |
3be34541 | 116 | { |
8ef5ada2 SK |
117 | u32 cookie = htonl(DHCP_COOKIE); |
118 | ||
3be34541 | 119 | /* only insist on a cookie for DHCP. */ |
8ef5ada2 | 120 | if (memcmp(mess->options, &cookie, sizeof(u32)) != 0) |
3be34541 | 121 | return 0; |
8ef5ada2 SK |
122 | |
123 | mess_type = option_uint(opt, 0, 1); | |
124 | ||
5e9e0efb SK |
125 | /* two things to note here: expand_buf may move the packet, |
126 | so reassign mess from daemon->packet. Also, the size | |
127 | sent includes the IP and UDP headers, hence the magic "-28" */ | |
128 | if ((opt = option_find(mess, sz, OPTION_MAXMESSAGE, 2))) | |
129 | { | |
7622fc06 | 130 | size_t size = (size_t)option_uint(opt, 0, 2) - 28; |
5e9e0efb SK |
131 | |
132 | if (size > DHCP_PACKET_MAX) | |
133 | size = DHCP_PACKET_MAX; | |
134 | else if (size < sizeof(struct dhcp_packet)) | |
135 | size = sizeof(struct dhcp_packet); | |
136 | ||
137 | if (expand_buf(&daemon->dhcp_packet, size)) | |
138 | { | |
824af85b | 139 | mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
7622fc06 | 140 | real_end = end = ((unsigned char *)mess) + size; |
5e9e0efb SK |
141 | } |
142 | } | |
143 | ||
3be34541 SK |
144 | /* Some buggy clients set ciaddr when they shouldn't, so clear that here since |
145 | it can affect the context-determination code. */ | |
bb01cb96 | 146 | if ((option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ) || mess_type == DHCPDISCOVER)) |
3be34541 | 147 | mess->ciaddr.s_addr = 0; |
44a2a316 | 148 | |
316e2730 SK |
149 | /* search for device identity from CPEWAN devices, we pass this through to the script */ |
150 | if ((opt = option_find(mess, sz, OPTION_VENDOR_IDENT_OPT, 5))) | |
151 | { | |
152 | unsigned int elen, offset, len = option_len(opt); | |
153 | ||
154 | for (offset = 0; offset < (len - 5); offset += elen + 5) | |
155 | { | |
156 | elen = option_uint(opt, offset + 4 , 1); | |
157 | if (option_uint(opt, offset, 4) == BRDBAND_FORUM_IANA) | |
158 | { | |
159 | unsigned char *x = option_ptr(opt, offset + 5); | |
160 | unsigned char *y = option_ptr(opt, offset + elen + 5); | |
161 | oui = option_find1(x, y, 1, 1); | |
162 | serial = option_find1(x, y, 2, 1); | |
163 | class = option_find1(x, y, 3, 1); | |
164 | ||
165 | /* If TR069-id is present set the tag "cpewan-id" to facilitate echoing | |
166 | the gateway id back. Note that the device class is optional */ | |
167 | if (oui && serial) | |
168 | { | |
169 | cpewan_id.net = "cpewan-id"; | |
170 | cpewan_id.next = netid; | |
171 | netid = &cpewan_id; | |
172 | } | |
173 | break; | |
174 | } | |
175 | } | |
176 | } | |
177 | ||
5e9e0efb SK |
178 | if ((opt = option_find(mess, sz, OPTION_AGENT_ID, 1))) |
179 | { | |
180 | /* Any agent-id needs to be copied back out, verbatim, as the last option | |
181 | in the packet. Here, we shift it to the very end of the buffer, if it doesn't | |
182 | get overwritten, then it will be shuffled back at the end of processing. | |
183 | Note that the incoming options must not be overwritten here, so there has to | |
184 | be enough free space at the end of the packet to copy the option. */ | |
f2621c7f | 185 | unsigned char *sopt; |
5e9e0efb SK |
186 | unsigned int total = option_len(opt) + 2; |
187 | unsigned char *last_opt = option_find(mess, sz, OPTION_END, 0); | |
188 | if (last_opt && last_opt < end - total) | |
189 | { | |
7622fc06 SK |
190 | end -= total; |
191 | agent_id = end; | |
5e9e0efb SK |
192 | memcpy(agent_id, opt, total); |
193 | } | |
194 | ||
195 | /* look for RFC3527 Link selection sub-option */ | |
1a6bca81 | 196 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SUBNET_SELECT, INADDRSZ))) |
f2621c7f | 197 | subnet_addr = option_addr(sopt); |
1a6bca81 SK |
198 | |
199 | /* look for RFC5107 server-identifier-override */ | |
200 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SERVER_OR, INADDRSZ))) | |
201 | override = option_addr(sopt); | |
f2621c7f SK |
202 | |
203 | /* if a circuit-id or remote-is option is provided, exact-match to options. */ | |
204 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) | |
205 | { | |
206 | int search; | |
207 | ||
208 | if (vendor->match_type == MATCH_CIRCUIT) | |
209 | search = SUBOPT_CIRCUIT_ID; | |
210 | else if (vendor->match_type == MATCH_REMOTE) | |
211 | search = SUBOPT_REMOTE_ID; | |
212 | else if (vendor->match_type == MATCH_SUBSCRIBER) | |
213 | search = SUBOPT_SUBSCR_ID; | |
214 | else | |
215 | continue; | |
216 | ||
1a6bca81 | 217 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), search, 1)) && |
f2621c7f | 218 | vendor->len == option_len(sopt) && |
1a6bca81 | 219 | memcmp(option_ptr(sopt, 0), vendor->data, vendor->len) == 0) |
f2621c7f SK |
220 | { |
221 | vendor->netid.next = netid; | |
222 | netid = &vendor->netid; | |
f2621c7f SK |
223 | } |
224 | } | |
5e9e0efb | 225 | } |
f2621c7f | 226 | |
5e9e0efb SK |
227 | /* Check for RFC3011 subnet selector - only if RFC3527 one not present */ |
228 | if (subnet_addr.s_addr == 0 && (opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ))) | |
3be34541 | 229 | subnet_addr = option_addr(opt); |
26128d27 SK |
230 | |
231 | /* If there is no client identifier option, use the hardware address */ | |
bb01cb96 | 232 | if ((opt = option_find(mess, sz, OPTION_CLIENT_ID, 1))) |
26128d27 | 233 | { |
26128d27 | 234 | clid_len = option_len(opt); |
1a6bca81 | 235 | clid = option_ptr(opt, 0); |
26128d27 | 236 | } |
1b7ecd11 | 237 | |
0a852541 | 238 | /* do we have a lease in store? */ |
5e9e0efb | 239 | lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, clid, clid_len); |
0a852541 SK |
240 | |
241 | /* If this request is missing a clid, but we've seen one before, | |
242 | use it again for option matching etc. */ | |
243 | if (lease && !clid && lease->clid) | |
244 | { | |
245 | clid_len = lease->clid_len; | |
246 | clid = lease->clid; | |
247 | } | |
1b7ecd11 SK |
248 | |
249 | /* find mac to use for logging and hashing */ | |
250 | emac = extended_hwaddr(mess->htype, mess->hlen, mess->chaddr, clid_len, clid, &emac_len); | |
44a2a316 | 251 | } |
3be34541 | 252 | |
cdeda28f SK |
253 | for (mac = daemon->dhcp_macs; mac; mac = mac->next) |
254 | if (mac->hwaddr_len == mess->hlen && | |
5e9e0efb SK |
255 | (mac->hwaddr_type == mess->htype || mac->hwaddr_type == 0) && |
256 | memcmp_masked(mac->hwaddr, mess->chaddr, mess->hlen, mac->mask)) | |
cdeda28f | 257 | { |
5e9e0efb SK |
258 | mac->netid.next = netid; |
259 | netid = &mac->netid; | |
cdeda28f | 260 | } |
3d8df260 | 261 | |
0a852541 SK |
262 | /* Determine network for this packet. Our caller will have already linked all the |
263 | contexts which match the addresses of the receiving interface but if the | |
264 | machine has an address already, or came via a relay, or we have a subnet selector, | |
265 | we search again. If we don't have have a giaddr or explicit subnet selector, | |
266 | use the ciaddr. This is necessary because a machine which got a lease via a | |
3d8df260 SK |
267 | relay won't use the relay to renew. If matching a ciaddr fails but we have a context |
268 | from the physical network, continue using that to allow correct DHCPNAK generation later. */ | |
0a852541 SK |
269 | if (mess->giaddr.s_addr || subnet_addr.s_addr || mess->ciaddr.s_addr) |
270 | { | |
3d8df260 | 271 | struct dhcp_context *context_tmp, *context_new = NULL; |
1697269c | 272 | struct in_addr addr; |
3d8df260 SK |
273 | int force = 0; |
274 | ||
275 | if (subnet_addr.s_addr) | |
276 | { | |
277 | addr = subnet_addr; | |
278 | force = 1; | |
279 | } | |
280 | else if (mess->giaddr.s_addr) | |
281 | { | |
282 | addr = mess->giaddr; | |
283 | force = 1; | |
284 | } | |
1697269c SK |
285 | else |
286 | { | |
287 | /* If ciaddr is in the hardware derived set of contexts, leave that unchanged */ | |
288 | addr = mess->ciaddr; | |
289 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) | |
290 | if (context_tmp->netmask.s_addr && | |
291 | is_same_net(addr, context_tmp->start, context_tmp->netmask) && | |
292 | is_same_net(addr, context_tmp->end, context_tmp->netmask)) | |
293 | { | |
294 | context_new = context; | |
295 | break; | |
296 | } | |
297 | } | |
298 | ||
299 | if (!context_new) | |
300 | for (context_tmp = daemon->dhcp; context_tmp; context_tmp = context_tmp->next) | |
7de060b0 SK |
301 | { |
302 | struct in_addr netmask = context_tmp->netmask; | |
303 | ||
304 | /* guess the netmask for relayed networks */ | |
305 | if (!(context_tmp->flags & CONTEXT_NETMASK) && context_tmp->netmask.s_addr == 0) | |
306 | { | |
307 | if (IN_CLASSA(ntohl(context_tmp->start.s_addr)) && IN_CLASSA(ntohl(context_tmp->end.s_addr))) | |
308 | netmask.s_addr = htonl(0xff000000); | |
309 | else if (IN_CLASSB(ntohl(context_tmp->start.s_addr)) && IN_CLASSB(ntohl(context_tmp->end.s_addr))) | |
310 | netmask.s_addr = htonl(0xffff0000); | |
311 | else if (IN_CLASSC(ntohl(context_tmp->start.s_addr)) && IN_CLASSC(ntohl(context_tmp->end.s_addr))) | |
312 | netmask.s_addr = htonl(0xffffff00); | |
313 | } | |
314 | ||
315 | /* This section fills in context mainly when a client which is on a remote (relayed) | |
316 | network renews a lease without using the relay, after dnsmasq has restarted. */ | |
317 | if (netmask.s_addr != 0 && | |
318 | is_same_net(addr, context_tmp->start, netmask) && | |
319 | is_same_net(addr, context_tmp->end, netmask)) | |
320 | { | |
321 | context_tmp->netmask = netmask; | |
322 | if (context_tmp->local.s_addr == 0) | |
323 | context_tmp->local = fallback; | |
324 | if (context_tmp->router.s_addr == 0) | |
325 | context_tmp->router = mess->giaddr; | |
326 | ||
327 | /* fill in missing broadcast addresses for relayed ranges */ | |
328 | if (!(context_tmp->flags & CONTEXT_BRDCAST) && context_tmp->broadcast.s_addr == 0 ) | |
329 | context_tmp->broadcast.s_addr = context_tmp->start.s_addr | ~context_tmp->netmask.s_addr; | |
330 | ||
331 | context_tmp->current = context_new; | |
332 | context_new = context_tmp; | |
333 | } | |
334 | } | |
0a852541 | 335 | |
3d8df260 | 336 | if (context_new || force) |
7de060b0 | 337 | context = context_new; |
0a852541 | 338 | } |
3be34541 SK |
339 | |
340 | if (!context) | |
341 | { | |
7622fc06 | 342 | my_syslog(MS_DHCP | LOG_WARNING, _("no address range available for DHCP request %s %s"), |
f2621c7f SK |
343 | subnet_addr.s_addr ? _("with subnet selector") : _("via"), |
344 | subnet_addr.s_addr ? inet_ntoa(subnet_addr) : (mess->giaddr.s_addr ? inet_ntoa(mess->giaddr) : iface_name)); | |
3be34541 SK |
345 | return 0; |
346 | } | |
f2621c7f | 347 | |
28866e95 | 348 | if (option_bool(OPT_LOG_OPTS)) |
f2621c7f SK |
349 | { |
350 | struct dhcp_context *context_tmp; | |
f2621c7f SK |
351 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) |
352 | { | |
353 | strcpy(daemon->namebuff, inet_ntoa(context_tmp->start)); | |
7622fc06 | 354 | if (context_tmp->flags & (CONTEXT_STATIC | CONTEXT_PROXY)) |
8ef5ada2 | 355 | my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP subnet: %s/%s"), |
7622fc06 | 356 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->netmask)); |
f2621c7f | 357 | else |
8ef5ada2 | 358 | my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP range: %s -- %s"), |
7622fc06 | 359 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->end)); |
f2621c7f SK |
360 | } |
361 | } | |
362 | ||
3be34541 | 363 | mess->op = BOOTREPLY; |
5e9e0efb | 364 | |
cdeda28f SK |
365 | config = find_config(daemon->dhcp_conf, context, clid, clid_len, |
366 | mess->chaddr, mess->hlen, mess->htype, NULL); | |
5aabfc78 SK |
367 | |
368 | /* set "known" tag for known hosts */ | |
369 | if (config) | |
370 | { | |
371 | known_id.net = "known"; | |
372 | known_id.next = netid; | |
373 | netid = &known_id; | |
374 | } | |
26128d27 | 375 | |
316e2730 | 376 | if (mess_type == 0 && !pxe) |
3be34541 SK |
377 | { |
378 | /* BOOTP request */ | |
6b01084f | 379 | struct dhcp_netid id, bootp_id; |
26128d27 | 380 | struct in_addr *logaddr = NULL; |
5e9e0efb SK |
381 | |
382 | /* must have a MAC addr for bootp */ | |
7622fc06 | 383 | if (mess->htype == 0 || mess->hlen == 0 || (context->flags & CONTEXT_PROXY)) |
5e9e0efb | 384 | return 0; |
26128d27 | 385 | |
26128d27 | 386 | if (have_config(config, CONFIG_DISABLE)) |
b8187c80 | 387 | message = _("disabled"); |
26128d27 SK |
388 | |
389 | end = mess->options + 64; /* BOOTP vend area is only 64 bytes */ | |
390 | ||
391 | if (have_config(config, CONFIG_NAME)) | |
9009d746 SK |
392 | { |
393 | hostname = config->hostname; | |
394 | domain = config->domain; | |
395 | } | |
396 | ||
8ef5ada2 | 397 | if (config) |
26128d27 | 398 | { |
8ef5ada2 SK |
399 | struct dhcp_netid_list *list; |
400 | ||
401 | for (list = config->netid; list; list = list->next) | |
402 | { | |
403 | list->list->next = netid; | |
404 | netid = list->list; | |
405 | } | |
26128d27 SK |
406 | } |
407 | ||
408 | /* Match incoming filename field as a netid. */ | |
409 | if (mess->file[0]) | |
410 | { | |
1b7ecd11 SK |
411 | memcpy(daemon->dhcp_buff2, mess->file, sizeof(mess->file)); |
412 | daemon->dhcp_buff2[sizeof(mess->file) + 1] = 0; /* ensure zero term. */ | |
413 | id.net = (char *)daemon->dhcp_buff2; | |
26128d27 SK |
414 | id.next = netid; |
415 | netid = &id; | |
416 | } | |
6b01084f SK |
417 | |
418 | /* Add "bootp" as a tag to allow different options, address ranges etc | |
419 | for BOOTP clients */ | |
420 | bootp_id.net = "bootp"; | |
421 | bootp_id.next = netid; | |
422 | netid = &bootp_id; | |
26128d27 | 423 | |
8ef5ada2 SK |
424 | tagif_netid = run_tag_if(netid); |
425 | ||
26128d27 | 426 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) |
8ef5ada2 | 427 | if (match_netid(id_list->list, tagif_netid, 0)) |
1f15b81d | 428 | message = _("ignored"); |
26128d27 | 429 | |
3d8df260 SK |
430 | if (!message) |
431 | { | |
9009d746 SK |
432 | int nailed = 0; |
433 | ||
3d8df260 SK |
434 | if (have_config(config, CONFIG_ADDR)) |
435 | { | |
9009d746 | 436 | nailed = 1; |
3d8df260 SK |
437 | logaddr = &config->addr; |
438 | mess->yiaddr = config->addr; | |
439 | if ((lease = lease_find_by_addr(config->addr)) && | |
cdeda28f | 440 | (lease->hwaddr_len != mess->hlen || |
5e9e0efb | 441 | lease->hwaddr_type != mess->htype || |
cdeda28f | 442 | memcmp(lease->hwaddr, mess->chaddr, lease->hwaddr_len) != 0)) |
b8187c80 | 443 | message = _("address in use"); |
3d8df260 | 444 | } |
3d8df260 SK |
445 | else |
446 | { | |
cdeda28f | 447 | if (!(lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, NULL, 0)) || |
8ef5ada2 | 448 | !address_available(context, lease->addr, tagif_netid)) |
e17fb629 SK |
449 | { |
450 | if (lease) | |
451 | { | |
452 | /* lease exists, wrong network. */ | |
453 | lease_prune(lease, now); | |
454 | lease = NULL; | |
455 | } | |
8ef5ada2 | 456 | if (!address_allocate(context, &mess->yiaddr, mess->chaddr, mess->hlen, tagif_netid, now)) |
e17fb629 SK |
457 | message = _("no address available"); |
458 | } | |
459 | else | |
3d8df260 | 460 | mess->yiaddr = lease->addr; |
3d8df260 SK |
461 | } |
462 | ||
9009d746 SK |
463 | if (!message && !(context = narrow_context(context, mess->yiaddr, netid))) |
464 | message = _("wrong network"); | |
465 | else if (context->netid.net) | |
466 | { | |
467 | context->netid.next = netid; | |
7de060b0 | 468 | tagif_netid = run_tag_if(&context->netid); |
8ef5ada2 | 469 | } |
7de060b0 SK |
470 | |
471 | log_tags(tagif_netid, mess); | |
8ef5ada2 | 472 | |
9009d746 SK |
473 | if (!message && !nailed) |
474 | { | |
475 | for (id_list = daemon->bootp_dynamic; id_list; id_list = id_list->next) | |
8ef5ada2 | 476 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) |
9009d746 SK |
477 | break; |
478 | if (!id_list) | |
479 | message = _("no address configured"); | |
480 | } | |
481 | ||
7cebd20f SK |
482 | if (!message && |
483 | !lease && | |
52b92f4d | 484 | (!(lease = lease4_allocate(mess->yiaddr)))) |
824af85b | 485 | message = _("no leases left"); |
9009d746 | 486 | |
3d8df260 SK |
487 | if (!message) |
488 | { | |
489 | logaddr = &mess->yiaddr; | |
3d8df260 | 490 | |
cdeda28f | 491 | lease_set_hwaddr(lease, mess->chaddr, NULL, mess->hlen, mess->htype, 0); |
3d8df260 | 492 | if (hostname) |
9009d746 | 493 | lease_set_hostname(lease, hostname, 1); |
1a6bca81 SK |
494 | /* infinite lease unless nailed in dhcp-host line. */ |
495 | lease_set_expires(lease, | |
496 | have_config(config, CONFIG_TIME) ? config->lease_time : 0xffffffff, | |
497 | now); | |
824af85b | 498 | lease_set_interface(lease, int_index); |
3d8df260 | 499 | |
7622fc06 | 500 | clear_packet(mess, end); |
9009d746 | 501 | do_options(context, mess, end, NULL, hostname, get_domain(mess->yiaddr), |
7de060b0 | 502 | domain, netid, subnet_addr, 0, 0, 0, NULL, 0, now); |
3d8df260 SK |
503 | } |
504 | } | |
505 | ||
7622fc06 | 506 | log_packet("BOOTP", logaddr, mess->chaddr, mess->hlen, iface_name, message, mess->xid); |
1b7ecd11 | 507 | |
7de060b0 | 508 | return message ? 0 : dhcp_packet_size(mess, agent_id, real_end); |
3be34541 | 509 | } |
1b7ecd11 | 510 | |
3d8df260 | 511 | if ((opt = option_find(mess, sz, OPTION_CLIENT_FQDN, 4))) |
9e4abcb5 | 512 | { |
3d8df260 | 513 | /* http://tools.ietf.org/wg/dhc/draft-ietf-dhc-fqdn-option/draft-ietf-dhc-fqdn-option-10.txt */ |
f6b7dc47 | 514 | int len = option_len(opt); |
3d8df260 | 515 | char *pq = daemon->dhcp_buff; |
1a6bca81 | 516 | unsigned char *pp, *op = option_ptr(opt, 0); |
3d8df260 SK |
517 | |
518 | fqdn_flags = *op; | |
519 | len -= 3; | |
520 | op += 3; | |
521 | pp = op; | |
522 | ||
523 | /* Always force update, since the client has no way to do it itself. */ | |
c72daea8 SK |
524 | if (!option_bool(OPT_FQDN_UPDATE) && !(fqdn_flags & 0x01)) |
525 | fqdn_flags |= 0x03; | |
526 | ||
3d8df260 | 527 | fqdn_flags &= ~0x08; |
3d8df260 SK |
528 | |
529 | if (fqdn_flags & 0x04) | |
530 | while (*op != 0 && ((op + (*op) + 1) - pp) < len) | |
531 | { | |
532 | memcpy(pq, op+1, *op); | |
533 | pq += *op; | |
534 | op += (*op)+1; | |
535 | *(pq++) = '.'; | |
536 | } | |
537 | else | |
9e4abcb5 | 538 | { |
3d8df260 | 539 | memcpy(pq, op, len); |
cdeda28f SK |
540 | if (len > 0 && op[len-1] == 0) |
541 | borken_opt = 1; | |
3d8df260 | 542 | pq += len + 1; |
9e4abcb5 | 543 | } |
3d8df260 SK |
544 | |
545 | if (pq != daemon->dhcp_buff) | |
546 | pq--; | |
547 | ||
548 | *pq = 0; | |
549 | ||
1f15b81d | 550 | if (legal_hostname(daemon->dhcp_buff)) |
3d8df260 SK |
551 | offer_hostname = client_hostname = daemon->dhcp_buff; |
552 | } | |
553 | else if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1))) | |
554 | { | |
555 | int len = option_len(opt); | |
1a6bca81 | 556 | memcpy(daemon->dhcp_buff, option_ptr(opt, 0), len); |
cdeda28f SK |
557 | /* Microsoft clients are broken, and need zero-terminated strings |
558 | in options. We detect this state here, and do the same in | |
559 | any options we send */ | |
560 | if (len > 0 && daemon->dhcp_buff[len-1] == 0) | |
561 | borken_opt = 1; | |
562 | else | |
563 | daemon->dhcp_buff[len] = 0; | |
1f15b81d | 564 | if (legal_hostname(daemon->dhcp_buff)) |
3d8df260 SK |
565 | client_hostname = daemon->dhcp_buff; |
566 | } | |
567 | ||
28866e95 | 568 | if (client_hostname && option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
569 | my_syslog(MS_DHCP | LOG_INFO, _("%u client provides name: %s"), ntohl(mess->xid), client_hostname); |
570 | ||
3d8df260 SK |
571 | if (have_config(config, CONFIG_NAME)) |
572 | { | |
573 | hostname = config->hostname; | |
9009d746 | 574 | domain = config->domain; |
b8187c80 | 575 | hostname_auth = 1; |
832af0ba | 576 | /* be careful not to send an OFFER with a hostname not matching the DISCOVER. */ |
3d8df260 | 577 | if (fqdn_flags != 0 || !client_hostname || hostname_isequal(hostname, client_hostname)) |
832af0ba | 578 | offer_hostname = hostname; |
3d8df260 | 579 | } |
5aabfc78 | 580 | else if (client_hostname) |
3d8df260 | 581 | { |
9009d746 | 582 | domain = strip_hostname(client_hostname); |
5aabfc78 SK |
583 | |
584 | if (strlen(client_hostname) != 0) | |
585 | { | |
586 | hostname = client_hostname; | |
587 | if (!config) | |
588 | { | |
589 | /* Search again now we have a hostname. | |
590 | Only accept configs without CLID and HWADDR here, (they won't match) | |
591 | to avoid impersonation by name. */ | |
592 | struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0, | |
593 | mess->chaddr, mess->hlen, | |
594 | mess->htype, hostname); | |
9009d746 | 595 | if (new && !have_config(new, CONFIG_CLID) && !new->hwaddr) |
824af85b SK |
596 | { |
597 | config = new; | |
598 | /* set "known" tag for known hosts */ | |
599 | known_id.net = "known"; | |
600 | known_id.next = netid; | |
601 | netid = &known_id; | |
602 | } | |
5aabfc78 SK |
603 | } |
604 | } | |
9e4abcb5 | 605 | } |
a84fa1d0 | 606 | |
8ef5ada2 | 607 | if (config) |
a84fa1d0 | 608 | { |
8ef5ada2 SK |
609 | struct dhcp_netid_list *list; |
610 | ||
611 | for (list = config->netid; list; list = list->next) | |
612 | { | |
613 | list->list->next = netid; | |
614 | netid = list->list; | |
615 | } | |
a84fa1d0 | 616 | } |
36717eee | 617 | |
73a08a24 SK |
618 | /* dhcp-match. If we have hex-and-wildcards, look for a left-anchored match. |
619 | Otherwise assume the option is an array, and look for a matching element. | |
316e2730 SK |
620 | If no data given, existance of the option is enough. This code handles |
621 | rfc3925 V-I classes too. */ | |
73a08a24 SK |
622 | for (o = daemon->dhcp_match; o; o = o->next) |
623 | { | |
316e2730 SK |
624 | unsigned int len, elen, match = 0; |
625 | size_t offset, o2; | |
626 | ||
627 | if (o->flags & DHOPT_RFC3925) | |
628 | { | |
629 | if (!(opt = option_find(mess, sz, OPTION_VENDOR_IDENT, 5))) | |
630 | continue; | |
631 | ||
632 | for (offset = 0; offset < (option_len(opt) - 5u); offset += len + 5) | |
633 | { | |
634 | len = option_uint(opt, offset + 4 , 1); | |
635 | /* Need to take care that bad data can't run us off the end of the packet */ | |
636 | if ((offset + len + 5 <= (option_len(opt))) && | |
637 | (option_uint(opt, offset, 4) == (unsigned int)o->u.encap)) | |
638 | for (o2 = offset + 5; o2 < offset + len + 5; o2 += elen + 1) | |
639 | { | |
640 | elen = option_uint(opt, o2, 1); | |
641 | if ((o2 + elen + 1 <= option_len(opt)) && | |
642 | (match = match_bytes(o, option_ptr(opt, o2 + 1), elen))) | |
643 | break; | |
644 | } | |
645 | if (match) | |
73a08a24 | 646 | break; |
316e2730 SK |
647 | } |
648 | } | |
649 | else | |
650 | { | |
651 | if (!(opt = option_find(mess, sz, o->opt, 1))) | |
652 | continue; | |
653 | ||
654 | match = match_bytes(o, option_ptr(opt, 0), option_len(opt)); | |
655 | } | |
73a08a24 | 656 | |
316e2730 | 657 | if (match) |
73a08a24 SK |
658 | { |
659 | o->netid->next = netid; | |
660 | netid = o->netid; | |
661 | } | |
662 | } | |
663 | ||
26128d27 SK |
664 | /* user-class options are, according to RFC3004, supposed to contain |
665 | a set of counted strings. Here we check that this is so (by seeing | |
666 | if the counts are consistent with the overall option length) and if | |
667 | so zero the counts so that we don't get spurious matches between | |
668 | the vendor string and the counts. If the lengths don't add up, we | |
669 | assume that the option is a single string and non RFC3004 compliant | |
1697269c SK |
670 | and just do the substring match. dhclient provides these broken options. |
671 | The code, later, which sends user-class data to the lease-change script | |
672 | relies on the transformation done here. | |
673 | */ | |
a222641c | 674 | |
bb01cb96 | 675 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) |
a222641c | 676 | { |
1a6bca81 | 677 | unsigned char *ucp = option_ptr(opt, 0); |
f6b7dc47 | 678 | int tmp, j; |
26128d27 SK |
679 | for (j = 0; j < option_len(opt); j += ucp[j] + 1); |
680 | if (j == option_len(opt)) | |
681 | for (j = 0; j < option_len(opt); j = tmp) | |
682 | { | |
683 | tmp = j + ucp[j] + 1; | |
684 | ucp[j] = 0; | |
685 | } | |
686 | } | |
73a08a24 | 687 | |
26128d27 | 688 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) |
f2621c7f SK |
689 | { |
690 | int mopt; | |
691 | ||
692 | if (vendor->match_type == MATCH_VENDOR) | |
693 | mopt = OPTION_VENDOR_ID; | |
694 | else if (vendor->match_type == MATCH_USER) | |
695 | mopt = OPTION_USER_CLASS; | |
696 | else | |
697 | continue; | |
698 | ||
699 | if ((opt = option_find(mess, sz, mopt, 1))) | |
700 | { | |
701 | int i; | |
702 | for (i = 0; i <= (option_len(opt) - vendor->len); i++) | |
1a6bca81 | 703 | if (memcmp(vendor->data, option_ptr(opt, i), vendor->len) == 0) |
f2621c7f SK |
704 | { |
705 | vendor->netid.next = netid; | |
706 | netid = &vendor->netid; | |
707 | break; | |
708 | } | |
709 | } | |
710 | } | |
711 | ||
8ef5ada2 SK |
712 | /* mark vendor-encapsulated options which match the client-supplied vendor class, |
713 | save client-supplied vendor class */ | |
714 | if ((opt = option_find(mess, sz, OPTION_VENDOR_ID, 1))) | |
715 | { | |
716 | memcpy(daemon->dhcp_buff3, option_ptr(opt, 0), option_len(opt)); | |
717 | vendor_class_len = option_len(opt); | |
718 | } | |
719 | match_vendor_opts(opt, daemon->dhcp_opts); | |
720 | ||
28866e95 | 721 | if (option_bool(OPT_LOG_OPTS)) |
f2621c7f | 722 | { |
8ef5ada2 SK |
723 | if (sanitise(opt, daemon->namebuff)) |
724 | my_syslog(MS_DHCP | LOG_INFO, _("%u vendor class: %s"), ntohl(mess->xid), daemon->namebuff); | |
f2621c7f | 725 | if (sanitise(option_find(mess, sz, OPTION_USER_CLASS, 1), daemon->namebuff)) |
8ef5ada2 | 726 | my_syslog(MS_DHCP | LOG_INFO, _("%u user class: %s"), ntohl(mess->xid), daemon->namebuff); |
f2621c7f SK |
727 | } |
728 | ||
8ef5ada2 SK |
729 | tagif_netid = run_tag_if(netid); |
730 | ||
26128d27 SK |
731 | /* if all the netids in the ignore list are present, ignore this client */ |
732 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) | |
8ef5ada2 | 733 | if (match_netid(id_list->list, tagif_netid, 0)) |
26128d27 | 734 | ignore = 1; |
8ef5ada2 SK |
735 | |
736 | /* If configured, we can override the server-id to be the address of the relay, | |
737 | so that all traffic goes via the relay and can pick up agent-id info. This can be | |
738 | configured for all relays, or by address. */ | |
739 | if (daemon->override && mess->giaddr.s_addr != 0 && override.s_addr == 0) | |
740 | { | |
741 | if (!daemon->override_relays) | |
742 | override = mess->giaddr; | |
743 | else | |
744 | { | |
745 | struct addr_list *l; | |
746 | for (l = daemon->override_relays; l; l = l->next) | |
747 | if (l->addr.s_addr == mess->giaddr.s_addr) | |
748 | break; | |
749 | if (l) | |
750 | override = mess->giaddr; | |
751 | } | |
752 | } | |
753 | ||
a84fa1d0 SK |
754 | /* Can have setting to ignore the client ID for a particular MAC address or hostname */ |
755 | if (have_config(config, CONFIG_NOCLID)) | |
0a852541 SK |
756 | clid = NULL; |
757 | ||
7622fc06 | 758 | /* Check if client is PXE client. */ |
1f15b81d SK |
759 | if (daemon->enable_pxe && |
760 | (opt = option_find(mess, sz, OPTION_VENDOR_ID, 9)) && | |
7622fc06 SK |
761 | strncmp(option_ptr(opt, 0), "PXEClient", 9) == 0) |
762 | { | |
763 | if ((opt = option_find(mess, sz, OPTION_PXE_UUID, 17))) | |
764 | { | |
765 | memcpy(pxe_uuid, option_ptr(opt, 0), 17); | |
766 | uuid = pxe_uuid; | |
767 | } | |
768 | ||
769 | /* Check if this is really a PXE bootserver request, and handle specially if so. */ | |
770 | if ((mess_type == DHCPREQUEST || mess_type == DHCPINFORM) && | |
771 | (opt = option_find(mess, sz, OPTION_VENDOR_CLASS_OPT, 1)) && | |
772 | (opt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_PXE_BOOT_ITEM, 4))) | |
773 | { | |
774 | struct pxe_service *service; | |
775 | int type = option_uint(opt, 0, 2); | |
776 | int layer = option_uint(opt, 2, 2); | |
777 | unsigned char save71[4]; | |
778 | struct dhcp_opt opt71; | |
779 | ||
1f15b81d SK |
780 | if (ignore) |
781 | return 0; | |
782 | ||
7622fc06 SK |
783 | if (layer & 0x8000) |
784 | { | |
785 | my_syslog(MS_DHCP | LOG_ERR, _("PXE BIS not supported")); | |
786 | return 0; | |
787 | } | |
788 | ||
789 | memcpy(save71, option_ptr(opt, 0), 4); | |
790 | ||
791 | for (service = daemon->pxe_services; service; service = service->next) | |
792 | if (service->type == type) | |
793 | break; | |
794 | ||
795 | if (!service || !service->basename) | |
796 | return 0; | |
797 | ||
798 | clear_packet(mess, end); | |
799 | ||
800 | mess->yiaddr = mess->ciaddr; | |
801 | mess->ciaddr.s_addr = 0; | |
802 | if (service->server.s_addr != 0) | |
803 | mess->siaddr = service->server; | |
804 | else | |
805 | mess->siaddr = context->local; | |
806 | ||
807 | snprintf((char *)mess->file, sizeof(mess->file), "%s.%d", service->basename, layer); | |
808 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); | |
809 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); | |
810 | pxe_misc(mess, end, uuid); | |
811 | ||
8ef5ada2 | 812 | prune_vendor_opts(tagif_netid); |
7622fc06 SK |
813 | opt71.val = save71; |
814 | opt71.opt = SUBOPT_PXE_BOOT_ITEM; | |
815 | opt71.len = 4; | |
816 | opt71.flags = DHOPT_VENDOR_MATCH; | |
817 | opt71.netid = NULL; | |
818 | opt71.next = daemon->dhcp_opts; | |
819 | do_encap_opts(&opt71, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); | |
820 | ||
821 | log_packet("PXE", &mess->yiaddr, emac, emac_len, iface_name, (char *)mess->file, mess->xid); | |
7de060b0 SK |
822 | log_tags(tagif_netid, mess); |
823 | return dhcp_packet_size(mess, agent_id, real_end); | |
7622fc06 SK |
824 | } |
825 | ||
826 | if ((opt = option_find(mess, sz, OPTION_ARCH, 2))) | |
827 | { | |
828 | pxearch = option_uint(opt, 0, 2); | |
829 | ||
316e2730 | 830 | /* proxy DHCP here. */ |
28866e95 | 831 | if ((mess_type == DHCPDISCOVER || (pxe && mess_type == DHCPREQUEST))) |
7622fc06 | 832 | { |
28866e95 | 833 | struct dhcp_context *tmp; |
7622fc06 | 834 | |
28866e95 SK |
835 | for (tmp = context; tmp; tmp = tmp->current) |
836 | if ((tmp->flags & CONTEXT_PROXY) && | |
837 | match_netid(tmp->filter, tagif_netid, 1)) | |
838 | break; | |
839 | ||
840 | if (tmp) | |
7622fc06 | 841 | { |
28866e95 SK |
842 | struct dhcp_boot *boot = find_boot(tagif_netid); |
843 | ||
844 | mess->yiaddr.s_addr = 0; | |
845 | if (mess_type == DHCPDISCOVER || mess->ciaddr.s_addr == 0) | |
846 | { | |
847 | mess->ciaddr.s_addr = 0; | |
848 | mess->flags |= htons(0x8000); /* broadcast */ | |
849 | } | |
850 | ||
851 | clear_packet(mess, end); | |
852 | ||
853 | /* Provide the bootfile here, for gPXE, and in case we have no menu items | |
854 | and set discovery_control = 8 */ | |
855 | if (boot) | |
856 | { | |
7de060b0 | 857 | if (boot->next_server.s_addr) |
28866e95 | 858 | mess->siaddr = boot->next_server; |
7de060b0 SK |
859 | else if (boot->tftp_sname) |
860 | mess->siaddr = a_record_from_hosts(boot->tftp_sname, now); | |
28866e95 SK |
861 | |
862 | if (boot->file) | |
863 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); | |
864 | } | |
7622fc06 | 865 | |
28866e95 SK |
866 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, |
867 | mess_type == DHCPDISCOVER ? DHCPOFFER : DHCPACK); | |
868 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); | |
869 | pxe_misc(mess, end, uuid); | |
870 | prune_vendor_opts(tagif_netid); | |
871 | do_encap_opts(pxe_opts(pxearch, tagif_netid, context->local), OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); | |
872 | ||
873 | log_packet("PXE", NULL, emac, emac_len, iface_name, ignore ? "proxy-ignored" : "proxy", mess->xid); | |
7de060b0 SK |
874 | log_tags(tagif_netid, mess); |
875 | return ignore ? 0 : dhcp_packet_size(mess, agent_id, real_end); | |
7622fc06 | 876 | } |
7622fc06 SK |
877 | } |
878 | } | |
879 | } | |
880 | ||
881 | /* if we're just a proxy server, go no further */ | |
316e2730 | 882 | if ((context->flags & CONTEXT_PROXY) || pxe) |
7622fc06 SK |
883 | return 0; |
884 | ||
bb01cb96 | 885 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0))) |
a84fa1d0 | 886 | { |
3d8df260 | 887 | req_options = (unsigned char *)daemon->dhcp_buff2; |
1a6bca81 | 888 | memcpy(req_options, option_ptr(opt, 0), option_len(opt)); |
bb01cb96 | 889 | req_options[option_len(opt)] = OPTION_END; |
a84fa1d0 SK |
890 | } |
891 | ||
3be34541 | 892 | switch (mess_type) |
9e4abcb5 | 893 | { |
44a2a316 | 894 | case DHCPDECLINE: |
bb01cb96 | 895 | if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
73a08a24 | 896 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
44a2a316 | 897 | return 0; |
1a6bca81 | 898 | |
44a2a316 | 899 | /* sanitise any message. Paranoid? Moi? */ |
f2621c7f | 900 | sanitise(option_find(mess, sz, OPTION_MESSAGE, 1), daemon->dhcp_buff); |
44a2a316 | 901 | |
bb01cb96 | 902 | if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
44a2a316 SK |
903 | return 0; |
904 | ||
7622fc06 | 905 | log_packet("DHCPDECLINE", option_ptr(opt, 0), emac, emac_len, iface_name, daemon->dhcp_buff, mess->xid); |
44a2a316 SK |
906 | |
907 | if (lease && lease->addr.s_addr == option_addr(opt).s_addr) | |
908 | lease_prune(lease, now); | |
909 | ||
33820b7e | 910 | if (have_config(config, CONFIG_ADDR) && |
44a2a316 | 911 | config->addr.s_addr == option_addr(opt).s_addr) |
9e4abcb5 | 912 | { |
849a8357 | 913 | prettyprint_time(daemon->dhcp_buff, DECLINE_BACKOFF); |
7622fc06 | 914 | my_syslog(MS_DHCP | LOG_WARNING, _("disabling DHCP static address %s for %s"), |
f2621c7f | 915 | inet_ntoa(config->addr), daemon->dhcp_buff); |
849a8357 SK |
916 | config->flags |= CONFIG_DECLINED; |
917 | config->decline_time = now; | |
9e4abcb5 | 918 | } |
feba5c1d SK |
919 | else |
920 | /* make sure this host gets a different address next time. */ | |
36717eee SK |
921 | for (; context; context = context->current) |
922 | context->addr_epoch++; | |
44a2a316 SK |
923 | |
924 | return 0; | |
925 | ||
926 | case DHCPRELEASE: | |
8ef5ada2 | 927 | if (!(context = narrow_context(context, mess->ciaddr, tagif_netid)) || |
1697269c | 928 | !(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
73a08a24 | 929 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
44a2a316 SK |
930 | return 0; |
931 | ||
44a2a316 SK |
932 | if (lease && lease->addr.s_addr == mess->ciaddr.s_addr) |
933 | lease_prune(lease, now); | |
fd9fa481 | 934 | else |
b8187c80 | 935 | message = _("unknown lease"); |
fd9fa481 | 936 | |
7622fc06 | 937 | log_packet("DHCPRELEASE", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
44a2a316 | 938 | |
9e4abcb5 SK |
939 | return 0; |
940 | ||
941 | case DHCPDISCOVER: | |
5e9e0efb SK |
942 | if (ignore || have_config(config, CONFIG_DISABLE)) |
943 | { | |
b8187c80 | 944 | message = _("ignored"); |
5e9e0efb SK |
945 | opt = NULL; |
946 | } | |
947 | else | |
948 | { | |
949 | struct in_addr addr, conf; | |
950 | ||
1a6bca81 SK |
951 | addr.s_addr = conf.s_addr = 0; |
952 | ||
5e9e0efb SK |
953 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
954 | addr = option_addr(opt); | |
955 | ||
5e9e0efb SK |
956 | if (have_config(config, CONFIG_ADDR)) |
957 | { | |
849a8357 SK |
958 | char *addrs = inet_ntoa(config->addr); |
959 | ||
9009d746 SK |
960 | if ((ltmp = lease_find_by_addr(config->addr)) && |
961 | ltmp != lease && | |
962 | !config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) | |
1b7ecd11 SK |
963 | { |
964 | int len; | |
965 | unsigned char *mac = extended_hwaddr(ltmp->hwaddr_type, ltmp->hwaddr_len, | |
966 | ltmp->hwaddr, ltmp->clid_len, ltmp->clid, &len); | |
7622fc06 | 967 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is leased to %s"), |
5aabfc78 | 968 | addrs, print_mac(daemon->namebuff, mac, len)); |
1b7ecd11 | 969 | } |
5e9e0efb SK |
970 | else |
971 | { | |
972 | struct dhcp_context *tmp; | |
973 | for (tmp = context; tmp; tmp = tmp->current) | |
849a8357 | 974 | if (context->router.s_addr == config->addr.s_addr) |
5e9e0efb SK |
975 | break; |
976 | if (tmp) | |
7622fc06 | 977 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is in use by the server or relay"), addrs); |
849a8357 SK |
978 | else if (have_config(config, CONFIG_DECLINED) && |
979 | difftime(now, config->decline_time) < (float)DECLINE_BACKOFF) | |
7622fc06 | 980 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it was previously declined"), addrs); |
5e9e0efb SK |
981 | else |
982 | conf = config->addr; | |
983 | } | |
984 | } | |
985 | ||
986 | if (conf.s_addr) | |
987 | mess->yiaddr = conf; | |
7622fc06 | 988 | else if (lease && |
8ef5ada2 | 989 | address_available(context, lease->addr, tagif_netid) && |
7622fc06 | 990 | !config_find_by_address(daemon->dhcp_conf, lease->addr)) |
5e9e0efb | 991 | mess->yiaddr = lease->addr; |
8ef5ada2 | 992 | else if (opt && address_available(context, addr, tagif_netid) && !lease_find_by_addr(addr) && |
5e9e0efb SK |
993 | !config_find_by_address(daemon->dhcp_conf, addr)) |
994 | mess->yiaddr = addr; | |
5aabfc78 SK |
995 | else if (emac_len == 0) |
996 | message = _("no unique-id"); | |
8ef5ada2 | 997 | else if (!address_allocate(context, &mess->yiaddr, emac, emac_len, tagif_netid, now)) |
5e9e0efb SK |
998 | message = _("no address available"); |
999 | } | |
1000 | ||
7622fc06 | 1001 | log_packet("DHCPDISCOVER", opt ? option_ptr(opt, 0) : NULL, emac, emac_len, iface_name, message, mess->xid); |
3d8df260 | 1002 | |
8ef5ada2 | 1003 | if (message || !(context = narrow_context(context, mess->yiaddr, tagif_netid))) |
33820b7e | 1004 | return 0; |
e17fb629 | 1005 | |
cdeda28f | 1006 | if (context->netid.net) |
59353a6b SK |
1007 | { |
1008 | context->netid.next = netid; | |
7de060b0 | 1009 | tagif_netid = run_tag_if(&context->netid); |
59353a6b | 1010 | } |
7de060b0 SK |
1011 | |
1012 | log_tags(tagif_netid, mess); | |
1013 | ||
1014 | log_packet("DHCPOFFER" , &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); | |
1015 | ||
824af85b | 1016 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
7622fc06 | 1017 | clear_packet(mess, end); |
1b7ecd11 | 1018 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPOFFER); |
73a08a24 | 1019 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1020 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
a84fa1d0 | 1021 | /* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */ |
59353a6b | 1022 | if (time != 0xffffffff) |
a84fa1d0 | 1023 | { |
1b7ecd11 SK |
1024 | option_put(mess, end, OPTION_T1, 4, (time/2)); |
1025 | option_put(mess, end, OPTION_T2, 4, (time*7)/8); | |
a84fa1d0 | 1026 | } |
9009d746 | 1027 | do_options(context, mess, end, req_options, offer_hostname, get_domain(mess->yiaddr), |
7de060b0 | 1028 | domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now); |
9e4abcb5 | 1029 | |
7de060b0 | 1030 | return dhcp_packet_size(mess, agent_id, real_end); |
9e4abcb5 SK |
1031 | |
1032 | case DHCPREQUEST: | |
26128d27 SK |
1033 | if (ignore || have_config(config, CONFIG_DISABLE)) |
1034 | return 0; | |
bb01cb96 | 1035 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
9e4abcb5 SK |
1036 | { |
1037 | /* SELECTING or INIT_REBOOT */ | |
44a2a316 | 1038 | mess->yiaddr = option_addr(opt); |
9e4abcb5 | 1039 | |
4011c4e0 SK |
1040 | /* send vendor and user class info for new or recreated lease */ |
1041 | do_classes = 1; | |
1042 | ||
bb01cb96 | 1043 | if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ))) |
3be34541 SK |
1044 | { |
1045 | /* SELECTING */ | |
832af0ba SK |
1046 | selecting = 1; |
1047 | ||
1a6bca81 SK |
1048 | if (override.s_addr != 0) |
1049 | { | |
1050 | if (option_addr(opt).s_addr != override.s_addr) | |
1051 | return 0; | |
1052 | } | |
9009d746 | 1053 | else |
1a6bca81 SK |
1054 | { |
1055 | for (; context; context = context->current) | |
1056 | if (context->local.s_addr == option_addr(opt).s_addr) | |
1057 | break; | |
1058 | ||
1059 | if (!context) | |
9009d746 | 1060 | { |
7de060b0 SK |
1061 | /* Handle very strange configs where clients have more than one route to the server. |
1062 | If a clients idea of its server-id matches any of our DHCP interfaces, we let it pass. | |
1063 | Have to set override to make sure we echo back the correct server-id */ | |
1064 | struct irec *intr; | |
1065 | ||
1066 | enumerate_interfaces(); | |
1067 | ||
1068 | for (intr = daemon->interfaces; intr; intr = intr->next) | |
1069 | if (intr->addr.sa.sa_family == AF_INET && | |
1070 | intr->addr.in.sin_addr.s_addr == option_addr(opt).s_addr && | |
1071 | intr->tftp_ok) | |
1072 | break; | |
1073 | ||
1074 | if (intr) | |
1075 | override = intr->addr.in.sin_addr; | |
1076 | else | |
1077 | { | |
1078 | /* In auth mode, a REQUEST sent to the wrong server | |
1079 | should be faulted, so that the client establishes | |
1080 | communication with us, otherwise, silently ignore. */ | |
1081 | if (!option_bool(OPT_AUTHORITATIVE)) | |
1082 | return 0; | |
1083 | message = _("wrong server-ID"); | |
1084 | } | |
9009d746 | 1085 | } |
1a6bca81 | 1086 | } |
e17fb629 | 1087 | |
3be34541 SK |
1088 | /* If a lease exists for this host and another address, squash it. */ |
1089 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) | |
1090 | { | |
1091 | lease_prune(lease, now); | |
1092 | lease = NULL; | |
1093 | } | |
3be34541 SK |
1094 | } |
1095 | else | |
9e4abcb5 | 1096 | { |
3be34541 | 1097 | /* INIT-REBOOT */ |
28866e95 | 1098 | if (!lease && !option_bool(OPT_AUTHORITATIVE)) |
3be34541 SK |
1099 | return 0; |
1100 | ||
fd9fa481 | 1101 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) |
8ef5ada2 | 1102 | message = _("wrong address"); |
9e4abcb5 | 1103 | } |
44a2a316 SK |
1104 | } |
1105 | else | |
1106 | { | |
1107 | /* RENEWING or REBINDING */ | |
cdeda28f SK |
1108 | /* Check existing lease for this address. |
1109 | We allow it to be missing if dhcp-authoritative mode | |
1110 | as long as we can allocate the lease now - checked below. | |
1111 | This makes for a smooth recovery from a lost lease DB */ | |
1112 | if ((lease && mess->ciaddr.s_addr != lease->addr.s_addr) || | |
28866e95 | 1113 | (!lease && !option_bool(OPT_AUTHORITATIVE))) |
b8187c80 | 1114 | { |
28866e95 SK |
1115 | /* A client rebinding will broadcast the request, so we may see it even |
1116 | if the lease is held by another server. Just ignore it in that case. | |
1117 | If the request is unicast to us, then somethings wrong, NAK */ | |
1118 | if (!unicast_dest) | |
1119 | return 0; | |
b8187c80 SK |
1120 | message = _("lease not found"); |
1121 | /* ensure we broadcast NAK */ | |
1122 | unicast_dest = 0; | |
1123 | } | |
8ef5ada2 | 1124 | |
a84fa1d0 SK |
1125 | /* desynchronise renewals */ |
1126 | fuzz = rand16(); | |
3be34541 | 1127 | mess->yiaddr = mess->ciaddr; |
44a2a316 SK |
1128 | } |
1129 | ||
7622fc06 | 1130 | log_packet("DHCPREQUEST", &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); |
e17fb629 | 1131 | |
dfa666f2 SK |
1132 | if (!message) |
1133 | { | |
1134 | struct dhcp_config *addr_config; | |
5e9e0efb SK |
1135 | struct dhcp_context *tmp = NULL; |
1136 | ||
1137 | if (have_config(config, CONFIG_ADDR)) | |
1138 | for (tmp = context; tmp; tmp = tmp->current) | |
849a8357 | 1139 | if (context->router.s_addr == config->addr.s_addr) |
5e9e0efb | 1140 | break; |
aedef830 | 1141 | |
8ef5ada2 | 1142 | if (!(context = narrow_context(context, mess->yiaddr, tagif_netid))) |
b8187c80 | 1143 | { |
e17fb629 | 1144 | /* If a machine moves networks whilst it has a lease, we catch that here. */ |
b8187c80 SK |
1145 | message = _("wrong network"); |
1146 | /* ensure we broadcast NAK */ | |
1147 | unicast_dest = 0; | |
1148 | } | |
1149 | ||
fd9fa481 | 1150 | /* Check for renewal of a lease which is outside the allowed range. */ |
8ef5ada2 | 1151 | else if (!address_available(context, mess->yiaddr, tagif_netid) && |
dfa666f2 | 1152 | (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr)) |
b8187c80 | 1153 | message = _("address not available"); |
e17fb629 | 1154 | |
dfa666f2 SK |
1155 | /* Check if a new static address has been configured. Be very sure that |
1156 | when the client does DISCOVER, it will get the static address, otherwise | |
1157 | an endless protocol loop will ensue. */ | |
832af0ba | 1158 | else if (!tmp && !selecting && |
5e9e0efb | 1159 | have_config(config, CONFIG_ADDR) && |
849a8357 SK |
1160 | (!have_config(config, CONFIG_DECLINED) || |
1161 | difftime(now, config->decline_time) > (float)DECLINE_BACKOFF) && | |
fd9fa481 SK |
1162 | config->addr.s_addr != mess->yiaddr.s_addr && |
1163 | (!(ltmp = lease_find_by_addr(config->addr)) || ltmp == lease)) | |
b8187c80 | 1164 | message = _("static lease available"); |
dfa666f2 SK |
1165 | |
1166 | /* Check to see if the address is reserved as a static address for another host */ | |
3be34541 | 1167 | else if ((addr_config = config_find_by_address(daemon->dhcp_conf, mess->yiaddr)) && addr_config != config) |
b8187c80 | 1168 | message = _("address reserved"); |
feba5c1d | 1169 | |
9009d746 SK |
1170 | else if (!lease && (ltmp = lease_find_by_addr(mess->yiaddr))) |
1171 | { | |
1172 | /* If a host is configured with more than one MAC address, it's OK to 'nix | |
1173 | a lease from one of it's MACs to give the address to another. */ | |
1174 | if (config && config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) | |
1175 | { | |
7622fc06 | 1176 | my_syslog(MS_DHCP | LOG_INFO, _("abandoning lease to %s of %s"), |
9009d746 SK |
1177 | print_mac(daemon->namebuff, ltmp->hwaddr, ltmp->hwaddr_len), |
1178 | inet_ntoa(ltmp->addr)); | |
1179 | lease = ltmp; | |
1180 | } | |
1697269c | 1181 | else |
9009d746 SK |
1182 | message = _("address in use"); |
1183 | } | |
1184 | ||
1185 | if (!message) | |
1186 | { | |
1187 | if (emac_len == 0) | |
1188 | message = _("no unique-id"); | |
1189 | ||
1190 | else if (!lease) | |
1191 | { | |
52b92f4d | 1192 | if ((lease = lease4_allocate(mess->yiaddr))) |
9009d746 SK |
1193 | do_classes = 1; |
1194 | else | |
1195 | message = _("no leases left"); | |
1196 | } | |
1697269c | 1197 | } |
fd9fa481 | 1198 | } |
1697269c | 1199 | |
44a2a316 SK |
1200 | if (message) |
1201 | { | |
7622fc06 | 1202 | log_packet("DHCPNAK", &mess->yiaddr, emac, emac_len, iface_name, message, mess->xid); |
44a2a316 | 1203 | |
1b7ecd11 | 1204 | mess->yiaddr.s_addr = 0; |
7622fc06 | 1205 | clear_packet(mess, end); |
1b7ecd11 | 1206 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPNAK); |
73a08a24 | 1207 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1208 | option_put_string(mess, end, OPTION_MESSAGE, message, borken_opt); |
b8187c80 SK |
1209 | /* This fixes a problem with the DHCP spec, broadcasting a NAK to a host on |
1210 | a distant subnet which unicast a REQ to us won't work. */ | |
1211 | if (!unicast_dest || mess->giaddr.s_addr != 0 || | |
1212 | mess->ciaddr.s_addr == 0 || is_same_net(context->local, mess->ciaddr, context->netmask)) | |
1213 | { | |
1214 | mess->flags |= htons(0x8000); /* broadcast */ | |
1215 | mess->ciaddr.s_addr = 0; | |
1216 | } | |
44a2a316 | 1217 | } |
fd9fa481 | 1218 | else |
44a2a316 | 1219 | { |
316e2730 SK |
1220 | if (context->netid.net) |
1221 | { | |
1222 | context->netid.next = netid; | |
7de060b0 | 1223 | tagif_netid = run_tag_if( &context->netid); |
316e2730 | 1224 | } |
7de060b0 SK |
1225 | |
1226 | log_tags(tagif_netid, mess); | |
8ef5ada2 | 1227 | |
316e2730 | 1228 | #ifdef HAVE_SCRIPT |
8ef5ada2 SK |
1229 | if (do_classes && daemon->lease_change_command) |
1230 | { | |
1231 | struct dhcp_netid *n; | |
1232 | ||
1233 | if (mess->giaddr.s_addr) | |
1234 | lease->giaddr = mess->giaddr; | |
1235 | ||
1236 | lease->changed = 1; | |
1237 | free(lease->extradata); | |
28866e95 | 1238 | lease->extradata = NULL; |
8ef5ada2 SK |
1239 | lease->extradata_size = lease->extradata_len = 0; |
1240 | ||
1241 | add_extradata_opt(lease, option_find(mess, sz, OPTION_VENDOR_ID, 1)); | |
1242 | add_extradata_opt(lease, option_find(mess, sz, OPTION_HOSTNAME, 1)); | |
1243 | add_extradata_opt(lease, oui); | |
1244 | add_extradata_opt(lease, serial); | |
1245 | add_extradata_opt(lease, class); | |
1246 | ||
1247 | /* space-concat tag set */ | |
1248 | if (!tagif_netid) | |
1249 | add_extradata_opt(lease, NULL); | |
1250 | else | |
1251 | for (n = tagif_netid; n; n = n->next) | |
39bec5ff SK |
1252 | { |
1253 | struct dhcp_netid *n1; | |
1254 | /* kill dupes */ | |
1255 | for (n1 = n->next; n1; n1 = n1->next) | |
1256 | if (strcmp(n->net, n1->net) == 0) | |
1257 | break; | |
1258 | if (!n1) | |
1259 | add_extradata_data(lease, (unsigned char *)n->net, strlen(n->net), n->next ? ' ' : 0); | |
1260 | } | |
1261 | ||
8ef5ada2 SK |
1262 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) |
1263 | { | |
1264 | int len = option_len(opt); | |
1265 | unsigned char *ucp = option_ptr(opt, 0); | |
1266 | /* If the user-class option started as counted strings, the first byte will be zero. */ | |
1267 | if (len != 0 && ucp[0] == 0) | |
1268 | ucp++, len--; | |
1269 | add_extradata_data(lease, ucp, len, 0); | |
1270 | } | |
1271 | } | |
316e2730 | 1272 | #endif |
8ef5ada2 SK |
1273 | |
1274 | if (!hostname_auth && (client_hostname = host_from_dns(mess->yiaddr))) | |
1275 | { | |
1276 | domain = get_domain(mess->yiaddr); | |
b8187c80 SK |
1277 | hostname = client_hostname; |
1278 | hostname_auth = 1; | |
1279 | } | |
8ef5ada2 | 1280 | |
824af85b | 1281 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
cdeda28f | 1282 | lease_set_hwaddr(lease, mess->chaddr, clid, mess->hlen, mess->htype, clid_len); |
8ef5ada2 | 1283 | |
832af0ba SK |
1284 | /* if all the netids in the ignore_name list are present, ignore client-supplied name */ |
1285 | if (!hostname_auth) | |
1286 | { | |
1287 | for (id_list = daemon->dhcp_ignore_names; id_list; id_list = id_list->next) | |
8ef5ada2 | 1288 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) |
832af0ba SK |
1289 | break; |
1290 | if (id_list) | |
1291 | hostname = NULL; | |
1292 | } | |
8ef5ada2 SK |
1293 | |
1294 | /* Last ditch, if configured, generate hostname from mac address */ | |
1295 | if (!hostname && emac_len != 0) | |
1296 | { | |
1297 | for (id_list = daemon->dhcp_gen_names; id_list; id_list = id_list->next) | |
1298 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) | |
1299 | break; | |
1300 | if (id_list) | |
1301 | { | |
1302 | int i; | |
1303 | ||
1304 | hostname = daemon->dhcp_buff; | |
1305 | /* buffer is 256 bytes, 3 bytes per octet */ | |
1306 | for (i = 0; (i < emac_len) && (i < 80); i++) | |
1307 | hostname += sprintf(hostname, "%.2x%s", emac[i], (i == emac_len - 1) ? "" : "-"); | |
1308 | hostname = daemon->dhcp_buff; | |
1309 | } | |
1310 | } | |
1311 | ||
fd9fa481 | 1312 | if (hostname) |
9009d746 | 1313 | lease_set_hostname(lease, hostname, hostname_auth); |
832af0ba | 1314 | |
5e9e0efb | 1315 | lease_set_expires(lease, time, now); |
824af85b | 1316 | lease_set_interface(lease, int_index); |
1a6bca81 SK |
1317 | |
1318 | if (override.s_addr != 0) | |
1319 | lease->override = override; | |
1320 | else | |
1321 | override = lease->override; | |
1322 | ||
7622fc06 | 1323 | log_packet("DHCPACK", &mess->yiaddr, emac, emac_len, iface_name, hostname, mess->xid); |
832af0ba | 1324 | |
7622fc06 | 1325 | clear_packet(mess, end); |
1b7ecd11 | 1326 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
73a08a24 | 1327 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1328 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
59353a6b | 1329 | if (time != 0xffffffff) |
fd9fa481 | 1330 | { |
59353a6b SK |
1331 | while (fuzz > (time/16)) |
1332 | fuzz = fuzz/2; | |
1b7ecd11 SK |
1333 | option_put(mess, end, OPTION_T1, 4, (time/2) - fuzz); |
1334 | option_put(mess, end, OPTION_T2, 4, ((time/8)*7) - fuzz); | |
fd9fa481 | 1335 | } |
9009d746 | 1336 | do_options(context, mess, end, req_options, hostname, get_domain(mess->yiaddr), |
7de060b0 | 1337 | domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now); |
44a2a316 | 1338 | } |
fd9fa481 | 1339 | |
7de060b0 | 1340 | return dhcp_packet_size(mess, agent_id, real_end); |
9e4abcb5 SK |
1341 | |
1342 | case DHCPINFORM: | |
26128d27 | 1343 | if (ignore || have_config(config, CONFIG_DISABLE)) |
b8187c80 | 1344 | message = _("ignored"); |
33820b7e | 1345 | |
7622fc06 | 1346 | log_packet("DHCPINFORM", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
a84fa1d0 | 1347 | |
73a08a24 | 1348 | if (message || mess->ciaddr.s_addr == 0) |
a84fa1d0 | 1349 | return 0; |
73a08a24 SK |
1350 | |
1351 | /* For DHCPINFORM only, cope without a valid context */ | |
8ef5ada2 | 1352 | context = narrow_context(context, mess->ciaddr, tagif_netid); |
9e4abcb5 | 1353 | |
5aabfc78 SK |
1354 | /* Find a least based on IP address if we didn't |
1355 | get one from MAC address/client-d */ | |
1356 | if (!lease && | |
1357 | (lease = lease_find_by_addr(mess->ciaddr)) && | |
1358 | lease->hostname) | |
1359 | hostname = lease->hostname; | |
1360 | ||
8ef5ada2 SK |
1361 | if (!hostname && (hostname = host_from_dns(mess->ciaddr))) |
1362 | domain = get_domain(mess->ciaddr); | |
5aabfc78 | 1363 | |
73a08a24 | 1364 | if (context && context->netid.net) |
59353a6b SK |
1365 | { |
1366 | context->netid.next = netid; | |
7de060b0 | 1367 | tagif_netid = run_tag_if( &context->netid); |
59353a6b | 1368 | } |
7de060b0 SK |
1369 | |
1370 | log_tags(tagif_netid, mess); | |
1371 | ||
1372 | log_packet("DHCPACK", &mess->ciaddr, emac, emac_len, iface_name, hostname, mess->xid); | |
1a6bca81 | 1373 | |
3927da46 SK |
1374 | if (lease) |
1375 | { | |
1376 | if (override.s_addr != 0) | |
1377 | lease->override = override; | |
1378 | else | |
1379 | override = lease->override; | |
1380 | } | |
1381 | ||
7622fc06 | 1382 | clear_packet(mess, end); |
1b7ecd11 | 1383 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
73a08a24 SK |
1384 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1385 | ||
5aabfc78 SK |
1386 | if (lease) |
1387 | { | |
1388 | if (lease->expires == 0) | |
1389 | time = 0xffffffff; | |
1390 | else | |
1391 | time = (unsigned int)difftime(lease->expires, now); | |
1392 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); | |
824af85b | 1393 | lease_set_interface(lease, int_index); |
5aabfc78 | 1394 | } |
824af85b | 1395 | |
9009d746 | 1396 | do_options(context, mess, end, req_options, hostname, get_domain(mess->ciaddr), |
7de060b0 | 1397 | domain, netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len, now); |
9e4abcb5 | 1398 | |
5aabfc78 | 1399 | *is_inform = 1; /* handle reply differently */ |
7de060b0 | 1400 | return dhcp_packet_size(mess, agent_id, real_end); |
9e4abcb5 SK |
1401 | } |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | ||
316e2730 SK |
1406 | static int match_bytes(struct dhcp_opt *o, unsigned char *p, int len) |
1407 | { | |
1408 | int i; | |
1409 | ||
1410 | if (o->len > len) | |
1411 | return 0; | |
1412 | ||
1413 | if (o->len == 0) | |
1414 | return 1; | |
1415 | ||
1416 | if (o->flags & DHOPT_HEX) | |
1417 | { | |
1418 | if (memcmp_masked(o->val, p, o->len, o->u.wildcard_mask)) | |
1419 | return 1; | |
1420 | } | |
1421 | else | |
1422 | for (i = 0; i <= (len - o->len); ) | |
1423 | { | |
1424 | if (memcmp(o->val, p + i, o->len) == 0) | |
1425 | return 1; | |
1426 | ||
1427 | if (o->flags & DHOPT_STRING) | |
1428 | i++; | |
1429 | else | |
1430 | i += o->len; | |
1431 | } | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | ||
6b01084f SK |
1437 | /* find a good value to use as MAC address for logging and address-allocation hashing. |
1438 | This is normally just the chaddr field from the DHCP packet, | |
1439 | but eg Firewire will have hlen == 0 and use the client-id instead. | |
1440 | This could be anything, but will normally be EUI64 for Firewire. | |
1441 | We assume that if the first byte of the client-id equals the htype byte | |
1442 | then the client-id is using the usual encoding and use the rest of the | |
1443 | client-id: if not we can use the whole client-id. This should give | |
1444 | sane MAC address logs. */ | |
9009d746 | 1445 | unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, |
6b01084f SK |
1446 | int clid_len, unsigned char *clid, int *len_out) |
1447 | { | |
1448 | if (hwlen == 0 && clid && clid_len > 3) | |
1449 | { | |
1450 | if (clid[0] == hwtype) | |
1451 | { | |
1452 | *len_out = clid_len - 1 ; | |
1453 | return clid + 1; | |
1454 | } | |
1455 | ||
1456 | #if defined(ARPHRD_EUI64) && defined(ARPHRD_IEEE1394) | |
1457 | if (clid[0] == ARPHRD_EUI64 && hwtype == ARPHRD_IEEE1394) | |
1458 | { | |
1459 | *len_out = clid_len - 1 ; | |
1460 | return clid + 1; | |
1461 | } | |
1462 | #endif | |
1463 | ||
1464 | *len_out = clid_len; | |
1465 | return clid; | |
1466 | } | |
1467 | ||
1468 | *len_out = hwlen; | |
1469 | return hwaddr; | |
1470 | } | |
1471 | ||
824af85b | 1472 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt) |
9e4abcb5 | 1473 | { |
5e9e0efb SK |
1474 | unsigned int time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time; |
1475 | ||
1476 | if (opt) | |
1477 | { | |
7622fc06 | 1478 | unsigned int req_time = option_uint(opt, 0, 4); |
5e9e0efb SK |
1479 | if (req_time < 120 ) |
1480 | req_time = 120; /* sanity */ | |
1481 | if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time)) | |
1482 | time = req_time; | |
1483 | } | |
3d8df260 | 1484 | |
5e9e0efb SK |
1485 | return time; |
1486 | } | |
1487 | ||
73a08a24 | 1488 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback) |
1a6bca81 | 1489 | { |
73a08a24 | 1490 | if (override.s_addr != 0) |
1a6bca81 | 1491 | return override; |
7de060b0 | 1492 | else if (context && context->local.s_addr != 0) |
1a6bca81 | 1493 | return context->local; |
73a08a24 SK |
1494 | else |
1495 | return fallback; | |
1a6bca81 SK |
1496 | } |
1497 | ||
f2621c7f SK |
1498 | static int sanitise(unsigned char *opt, char *buf) |
1499 | { | |
1500 | char *p; | |
1501 | int i; | |
1502 | ||
1503 | *buf = 0; | |
1504 | ||
1505 | if (!opt) | |
1506 | return 0; | |
1507 | ||
1a6bca81 | 1508 | p = option_ptr(opt, 0); |
f2621c7f SK |
1509 | |
1510 | for (i = option_len(opt); i > 0; i--) | |
1511 | { | |
1512 | char c = *p++; | |
824af85b | 1513 | if (isprint((int)c)) |
f2621c7f SK |
1514 | *buf++ = c; |
1515 | } | |
1516 | *buf = 0; /* add terminator */ | |
1517 | ||
1518 | return 1; | |
1519 | } | |
1520 | ||
316e2730 SK |
1521 | #ifdef HAVE_SCRIPT |
1522 | static void add_extradata_data(struct dhcp_lease *lease, unsigned char *data, size_t len, int delim) | |
1523 | { | |
1524 | if ((lease->extradata_size - lease->extradata_len) < (len + 1)) | |
1525 | { | |
1526 | size_t newsz = lease->extradata_len + len + 100; | |
1527 | unsigned char *new = whine_malloc(newsz); | |
1528 | ||
1529 | if (!new) | |
1530 | return; | |
1531 | ||
1532 | if (lease->extradata) | |
1533 | { | |
1534 | memcpy(new, lease->extradata, lease->extradata_len); | |
1535 | free(lease->extradata); | |
1536 | } | |
1537 | ||
1538 | lease->extradata = new; | |
1539 | lease->extradata_size = newsz; | |
1540 | } | |
1541 | ||
1542 | if (len != 0) | |
1543 | memcpy(lease->extradata + lease->extradata_len, data, len); | |
1544 | lease->extradata[lease->extradata_len + len] = delim; | |
1545 | lease->extradata_len += len + 1; | |
1546 | } | |
1547 | ||
1548 | static void add_extradata_opt(struct dhcp_lease *lease, unsigned char *opt) | |
1549 | { | |
1550 | if (!opt) | |
1551 | add_extradata_data(lease, NULL, 0, 0); | |
1552 | else | |
1553 | { | |
1554 | size_t i, len = option_len(opt); | |
1555 | unsigned char *ucp = option_ptr(opt, 0); | |
1556 | ||
1557 | /* check for embeded NULLs */ | |
1558 | for (i = 0; i < len; i++) | |
1559 | if (ucp[i] == 0) | |
1560 | { | |
1561 | len = i; | |
1562 | break; | |
1563 | } | |
1564 | ||
1565 | add_extradata_data(lease, ucp, len, 0); | |
1566 | } | |
1567 | } | |
1568 | #endif | |
1569 | ||
5aabfc78 | 1570 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, |
7622fc06 | 1571 | int mac_len, char *interface, char *string, u32 xid) |
5e9e0efb | 1572 | { |
1697269c | 1573 | struct in_addr a; |
7622fc06 | 1574 | |
1697269c SK |
1575 | /* addr may be misaligned */ |
1576 | if (addr) | |
1577 | memcpy(&a, addr, sizeof(a)); | |
1578 | ||
7622fc06 SK |
1579 | print_mac(daemon->namebuff, ext_mac, mac_len); |
1580 | ||
28866e95 | 1581 | if(option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1582 | my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s%s %s", |
1583 | ntohl(xid), | |
1584 | type, | |
1585 | interface, | |
1586 | addr ? inet_ntoa(a) : "", | |
1587 | addr ? " " : "", | |
1588 | daemon->namebuff, | |
1589 | string ? string : ""); | |
1590 | else | |
1591 | my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s%s %s", | |
1592 | type, | |
1593 | interface, | |
1594 | addr ? inet_ntoa(a) : "", | |
1595 | addr ? " " : "", | |
1596 | daemon->namebuff, | |
1597 | string ? string : ""); | |
f2621c7f SK |
1598 | } |
1599 | ||
7622fc06 | 1600 | static void log_options(unsigned char *start, u32 xid) |
f2621c7f SK |
1601 | { |
1602 | while (*start != OPTION_END) | |
1603 | { | |
7622fc06 SK |
1604 | int is_ip, is_name, i; |
1605 | char *text = option_string(start[0], &is_ip, &is_name); | |
1606 | unsigned char trunc = option_len(start); | |
1607 | ||
1608 | if (is_ip) | |
1609 | for (daemon->namebuff[0]= 0, i = 0; i <= trunc - INADDRSZ; i += INADDRSZ) | |
1610 | { | |
1611 | if (i != 0) | |
1612 | strncat(daemon->namebuff, ", ", 256 - strlen(daemon->namebuff)); | |
1613 | strncat(daemon->namebuff, inet_ntoa(option_addr_arr(start, i)), 256 - strlen(daemon->namebuff)); | |
1614 | } | |
1615 | else if (!is_name || !sanitise(start, daemon->namebuff)) | |
1616 | { | |
1617 | if (trunc > 13) | |
1618 | trunc = 13; | |
1619 | print_mac(daemon->namebuff, option_ptr(start, 0), trunc); | |
1620 | } | |
1621 | ||
1622 | my_syslog(MS_DHCP | LOG_INFO, "%u sent size:%3d option:%3d%s%s%s%s%s", | |
1623 | ntohl(xid), option_len(start), start[0], | |
f2621c7f | 1624 | text ? ":" : "", text ? text : "", |
7622fc06 SK |
1625 | trunc == 0 ? "" : " ", |
1626 | trunc == 0 ? "" : daemon->namebuff, | |
1627 | trunc == option_len(start) ? "" : "..."); | |
f2621c7f SK |
1628 | start += start[1] + 2; |
1629 | } | |
9e4abcb5 SK |
1630 | } |
1631 | ||
1b7ecd11 SK |
1632 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize) |
1633 | { | |
1a6bca81 | 1634 | while (1) |
1b7ecd11 | 1635 | { |
1a6bca81 SK |
1636 | if (p > end) |
1637 | return NULL; | |
1638 | else if (*p == OPTION_END) | |
1639 | return opt == OPTION_END ? p : NULL; | |
1b7ecd11 SK |
1640 | else if (*p == OPTION_PAD) |
1641 | p++; | |
1642 | else | |
1643 | { | |
1644 | int opt_len; | |
1a6bca81 | 1645 | if (p > end - 2) |
1b7ecd11 SK |
1646 | return NULL; /* malformed packet */ |
1647 | opt_len = option_len(p); | |
1a6bca81 | 1648 | if (p > end - (2 + opt_len)) |
1b7ecd11 SK |
1649 | return NULL; /* malformed packet */ |
1650 | if (*p == opt && opt_len >= minsize) | |
1651 | return p; | |
1652 | p += opt_len + 2; | |
1653 | } | |
1654 | } | |
1b7ecd11 SK |
1655 | } |
1656 | ||
1657 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize) | |
1658 | { | |
1659 | unsigned char *ret, *overload; | |
1660 | ||
1661 | /* skip over DHCP cookie; */ | |
1662 | if ((ret = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, opt_type, minsize))) | |
1663 | return ret; | |
1664 | ||
1665 | /* look for overload option. */ | |
1666 | if (!(overload = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, OPTION_OVERLOAD, 1))) | |
1667 | return NULL; | |
1668 | ||
1669 | /* Can we look in filename area ? */ | |
1670 | if ((overload[2] & 1) && | |
1671 | (ret = option_find1(&mess->file[0], &mess->file[128], opt_type, minsize))) | |
1672 | return ret; | |
1673 | ||
1674 | /* finally try sname area */ | |
1675 | if ((overload[2] & 2) && | |
1676 | (ret = option_find1(&mess->sname[0], &mess->sname[64], opt_type, minsize))) | |
1677 | return ret; | |
1678 | ||
1679 | return NULL; | |
1680 | } | |
1681 | ||
7622fc06 | 1682 | static struct in_addr option_addr_arr(unsigned char *opt, int offset) |
9e4abcb5 SK |
1683 | { |
1684 | /* this worries about unaligned data in the option. */ | |
1685 | /* struct in_addr is network byte order */ | |
1686 | struct in_addr ret; | |
1687 | ||
7622fc06 | 1688 | memcpy(&ret, option_ptr(opt, offset), INADDRSZ); |
9e4abcb5 SK |
1689 | |
1690 | return ret; | |
1691 | } | |
1692 | ||
7622fc06 SK |
1693 | static struct in_addr option_addr(unsigned char *opt) |
1694 | { | |
1695 | return option_addr_arr(opt, 0); | |
1696 | } | |
1697 | ||
1698 | static unsigned int option_uint(unsigned char *opt, int offset, int size) | |
9e4abcb5 SK |
1699 | { |
1700 | /* this worries about unaligned data and byte order */ | |
44a2a316 SK |
1701 | unsigned int ret = 0; |
1702 | int i; | |
7622fc06 | 1703 | unsigned char *p = option_ptr(opt, offset); |
9e4abcb5 | 1704 | |
44a2a316 SK |
1705 | for (i = 0; i < size; i++) |
1706 | ret = (ret << 8) | *p++; | |
1707 | ||
1708 | return ret; | |
9e4abcb5 SK |
1709 | } |
1710 | ||
1b7ecd11 | 1711 | static unsigned char *dhcp_skip_opts(unsigned char *start) |
9e4abcb5 | 1712 | { |
1b7ecd11 SK |
1713 | while (*start != 0) |
1714 | start += start[1] + 2; | |
1715 | return start; | |
1716 | } | |
26128d27 | 1717 | |
1b7ecd11 SK |
1718 | /* only for use when building packet: doesn't check for bad data. */ |
1719 | static unsigned char *find_overload(struct dhcp_packet *mess) | |
1720 | { | |
1721 | unsigned char *p = &mess->options[0] + sizeof(u32); | |
26128d27 | 1722 | |
1b7ecd11 | 1723 | while (*p != 0) |
26128d27 | 1724 | { |
1b7ecd11 SK |
1725 | if (*p == OPTION_OVERLOAD) |
1726 | return p; | |
1727 | p += p[1] + 2; | |
26128d27 | 1728 | } |
1b7ecd11 | 1729 | return NULL; |
9e4abcb5 SK |
1730 | } |
1731 | ||
7de060b0 | 1732 | static void log_tags(struct dhcp_netid *netid, struct dhcp_packet *mess) |
b8187c80 | 1733 | { |
28866e95 | 1734 | if (netid && option_bool(OPT_LOG_OPTS)) |
f2621c7f | 1735 | { |
1f15b81d SK |
1736 | char *s = daemon->namebuff; |
1737 | for (*s = 0; netid; netid = netid->next) | |
f2621c7f | 1738 | { |
9009d746 | 1739 | /* kill dupes. */ |
7de060b0 SK |
1740 | struct dhcp_netid *n; |
1741 | ||
9009d746 SK |
1742 | for (n = netid->next; n; n = n->next) |
1743 | if (strcmp(netid->net, n->net) == 0) | |
1744 | break; | |
1745 | ||
1746 | if (!n) | |
1747 | { | |
1f15b81d | 1748 | strncat (s, netid->net, (MAXDNAME-1) - strlen(s)); |
9009d746 | 1749 | if (netid->next) |
1f15b81d | 1750 | strncat (s, ", ", (MAXDNAME-1) - strlen(s)); |
9009d746 | 1751 | } |
f2621c7f | 1752 | } |
1f15b81d | 1753 | my_syslog(MS_DHCP | LOG_INFO, _("%u tags: %s"), ntohl(mess->xid), s); |
f2621c7f | 1754 | } |
7de060b0 SK |
1755 | } |
1756 | ||
1757 | static size_t dhcp_packet_size(struct dhcp_packet *mess, unsigned char *agent_id, unsigned char *real_end) | |
1758 | { | |
1759 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); | |
1760 | unsigned char *overload; | |
1761 | size_t ret; | |
1762 | ||
1763 | /* move agent_id back down to the end of the packet */ | |
1764 | if (agent_id) | |
1765 | { | |
1766 | memmove(p, agent_id, real_end - agent_id); | |
1767 | p += real_end - agent_id; | |
1768 | memset(p, 0, real_end - p); /* in case of overlap */ | |
1769 | } | |
1770 | ||
1b7ecd11 | 1771 | /* add END options to the regions. */ |
7622fc06 SK |
1772 | overload = find_overload(mess); |
1773 | ||
1774 | if (overload && (option_uint(overload, 0, 1) & 1)) | |
b8187c80 | 1775 | { |
7622fc06 | 1776 | *dhcp_skip_opts(mess->file) = OPTION_END; |
28866e95 | 1777 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1778 | log_options(mess->file, mess->xid); |
1779 | } | |
28866e95 | 1780 | else if (option_bool(OPT_LOG_OPTS) && strlen((char *)mess->file) != 0) |
7622fc06 SK |
1781 | my_syslog(MS_DHCP | LOG_INFO, _("%u bootfile name: %s"), ntohl(mess->xid), (char *)mess->file); |
1782 | ||
1783 | if (overload && (option_uint(overload, 0, 1) & 2)) | |
1784 | { | |
1785 | *dhcp_skip_opts(mess->sname) = OPTION_END; | |
28866e95 | 1786 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 | 1787 | log_options(mess->sname, mess->xid); |
b8187c80 | 1788 | } |
28866e95 | 1789 | else if (option_bool(OPT_LOG_OPTS) && strlen((char *)mess->sname) != 0) |
7622fc06 SK |
1790 | my_syslog(MS_DHCP | LOG_INFO, _("%u server name: %s"), ntohl(mess->xid), (char *)mess->sname); |
1791 | ||
b8187c80 | 1792 | |
1b7ecd11 | 1793 | *p++ = OPTION_END; |
824af85b | 1794 | |
28866e95 | 1795 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1796 | { |
1797 | if (mess->siaddr.s_addr != 0) | |
1798 | my_syslog(MS_DHCP | LOG_INFO, _("%u next server: %s"), ntohl(mess->xid), inet_ntoa(mess->siaddr)); | |
1799 | ||
8ef5ada2 SK |
1800 | if ((mess->flags & htons(0x8000)) && mess->ciaddr.s_addr == 0) |
1801 | my_syslog(MS_DHCP | LOG_INFO, _("%u broadcast response"), ntohl(mess->xid)); | |
1802 | ||
7622fc06 SK |
1803 | log_options(&mess->options[0] + sizeof(u32), mess->xid); |
1804 | } | |
1b7ecd11 SK |
1805 | |
1806 | ret = (size_t)(p - (unsigned char *)mess); | |
1807 | ||
1808 | if (ret < MIN_PACKETSZ) | |
1809 | ret = MIN_PACKETSZ; | |
8ef5ada2 | 1810 | |
1b7ecd11 | 1811 | return ret; |
b8187c80 SK |
1812 | } |
1813 | ||
1b7ecd11 | 1814 | static unsigned char *free_space(struct dhcp_packet *mess, unsigned char *end, int opt, int len) |
9e4abcb5 | 1815 | { |
1b7ecd11 | 1816 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); |
44a2a316 | 1817 | |
1b7ecd11 SK |
1818 | if (p + len + 3 >= end) |
1819 | /* not enough space in options area, try and use overload, if poss */ | |
1820 | { | |
1821 | unsigned char *overload; | |
1822 | ||
1823 | if (!(overload = find_overload(mess)) && | |
1824 | (mess->file[0] == 0 || mess->sname[0] == 0)) | |
1825 | { | |
1826 | /* attempt to overload fname and sname areas, we've reserved space for the | |
1827 | overflow option previuously. */ | |
1828 | overload = p; | |
1829 | *(p++) = OPTION_OVERLOAD; | |
1830 | *(p++) = 1; | |
1831 | } | |
1832 | ||
1833 | p = NULL; | |
1834 | ||
1835 | /* using filename field ? */ | |
1836 | if (overload) | |
1837 | { | |
1838 | if (mess->file[0] == 0) | |
1839 | overload[2] |= 1; | |
1840 | ||
1841 | if (overload[2] & 1) | |
1842 | { | |
1843 | p = dhcp_skip_opts(mess->file); | |
1844 | if (p + len + 3 >= mess->file + sizeof(mess->file)) | |
1845 | p = NULL; | |
1846 | } | |
1847 | ||
1848 | if (!p) | |
1849 | { | |
1850 | /* try to bring sname into play (it may be already) */ | |
1851 | if (mess->sname[0] == 0) | |
1852 | overload[2] |= 2; | |
1853 | ||
1854 | if (overload[2] & 2) | |
1855 | { | |
1856 | p = dhcp_skip_opts(mess->sname); | |
1857 | if (p + len + 3 >= mess->sname + sizeof(mess->file)) | |
1858 | p = NULL; | |
1859 | } | |
1860 | } | |
1861 | } | |
1862 | ||
1863 | if (!p) | |
7622fc06 | 1864 | my_syslog(MS_DHCP | LOG_WARNING, _("cannot send DHCP/BOOTP option %d: no space left in packet"), opt); |
1b7ecd11 SK |
1865 | } |
1866 | ||
1867 | if (p) | |
9e4abcb5 SK |
1868 | { |
1869 | *(p++) = opt; | |
a222641c | 1870 | *(p++) = len; |
9e4abcb5 | 1871 | } |
1b7ecd11 | 1872 | |
9e4abcb5 SK |
1873 | return p; |
1874 | } | |
1b7ecd11 SK |
1875 | |
1876 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val) | |
a222641c | 1877 | { |
1b7ecd11 SK |
1878 | int i; |
1879 | unsigned char *p = free_space(mess, end, opt, len); | |
a222641c | 1880 | |
1b7ecd11 SK |
1881 | if (p) |
1882 | for (i = 0; i < len; i++) | |
1883 | *(p++) = val >> (8 * (len - (i + 1))); | |
a222641c SK |
1884 | } |
1885 | ||
1b7ecd11 SK |
1886 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, int opt, |
1887 | char *string, int null_term) | |
44a2a316 | 1888 | { |
1b7ecd11 | 1889 | unsigned char *p; |
0a852541 | 1890 | size_t len = strlen(string); |
3be34541 | 1891 | |
cdeda28f SK |
1892 | if (null_term && len != 255) |
1893 | len++; | |
1894 | ||
1b7ecd11 SK |
1895 | if ((p = free_space(mess, end, opt, len))) |
1896 | memcpy(p, string, len); | |
44a2a316 | 1897 | } |
1b7ecd11 SK |
1898 | |
1899 | /* return length, note this only does the data part */ | |
73a08a24 | 1900 | static int do_opt(struct dhcp_opt *opt, unsigned char *p, struct dhcp_context *context, int null_term) |
9e4abcb5 | 1901 | { |
1b7ecd11 SK |
1902 | int len = opt->len; |
1903 | ||
1904 | if ((opt->flags & DHOPT_STRING) && null_term && len != 255) | |
1905 | len++; | |
1906 | ||
1907 | if (p && len != 0) | |
9e4abcb5 | 1908 | { |
73a08a24 | 1909 | if (context && (opt->flags & DHOPT_ADDR)) |
1b7ecd11 SK |
1910 | { |
1911 | int j; | |
1912 | struct in_addr *a = (struct in_addr *)opt->val; | |
1913 | for (j = 0; j < opt->len; j+=INADDRSZ, a++) | |
1914 | { | |
1915 | /* zero means "self" (but not in vendorclass options.) */ | |
1916 | if (a->s_addr == 0) | |
73a08a24 | 1917 | memcpy(p, &context->local, INADDRSZ); |
1b7ecd11 SK |
1918 | else |
1919 | memcpy(p, a, INADDRSZ); | |
1920 | p += INADDRSZ; | |
1921 | } | |
9e4abcb5 | 1922 | } |
1b7ecd11 SK |
1923 | else |
1924 | memcpy(p, opt->val, len); | |
1925 | } | |
1926 | return len; | |
9e4abcb5 | 1927 | } |
7622fc06 | 1928 | |
9e4abcb5 SK |
1929 | static int in_list(unsigned char *list, int opt) |
1930 | { | |
1931 | int i; | |
6b01084f SK |
1932 | |
1933 | /* If no requested options, send everything, not nothing. */ | |
a84fa1d0 SK |
1934 | if (!list) |
1935 | return 1; | |
1936 | ||
9e4abcb5 SK |
1937 | for (i = 0; list[i] != OPTION_END; i++) |
1938 | if (opt == list[i]) | |
1939 | return 1; | |
1940 | ||
1941 | return 0; | |
1942 | } | |
1943 | ||
7de060b0 | 1944 | static struct dhcp_opt *option_find2(int opt) |
9e4abcb5 | 1945 | { |
7de060b0 SK |
1946 | struct dhcp_opt *opts; |
1947 | ||
1948 | for (opts = daemon->dhcp_opts; opts; opts = opts->next) | |
1949 | if (opts->opt == opt && (opts->flags & DHOPT_TAGOK)) | |
1950 | return opts; | |
1951 | ||
8ef5ada2 | 1952 | return NULL; |
9e4abcb5 SK |
1953 | } |
1954 | ||
6b01084f SK |
1955 | /* mark vendor-encapsulated options which match the client-supplied or |
1956 | config-supplied vendor class */ | |
1957 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt) | |
1958 | { | |
1959 | for (; dopt; dopt = dopt->next) | |
1960 | { | |
7622fc06 | 1961 | dopt->flags &= ~DHOPT_VENDOR_MATCH; |
73a08a24 | 1962 | if (opt && (dopt->flags & DHOPT_VENDOR)) |
6b01084f SK |
1963 | { |
1964 | int i, len = 0; | |
73a08a24 SK |
1965 | if (dopt->u.vendor_class) |
1966 | len = strlen((char *)dopt->u.vendor_class); | |
6b01084f | 1967 | for (i = 0; i <= (option_len(opt) - len); i++) |
73a08a24 | 1968 | if (len == 0 || memcmp(dopt->u.vendor_class, option_ptr(opt, i), len) == 0) |
6b01084f | 1969 | { |
7622fc06 | 1970 | dopt->flags |= DHOPT_VENDOR_MATCH; |
6b01084f SK |
1971 | break; |
1972 | } | |
1973 | } | |
1974 | } | |
1975 | } | |
1976 | ||
8ef5ada2 SK |
1977 | static int do_encap_opts(struct dhcp_opt *opt, int encap, int flag, |
1978 | struct dhcp_packet *mess, unsigned char *end, int null_term) | |
73a08a24 | 1979 | { |
8ef5ada2 | 1980 | int len, enc_len, ret = 0; |
7622fc06 | 1981 | struct dhcp_opt *start; |
73a08a24 SK |
1982 | unsigned char *p; |
1983 | ||
1984 | /* find size in advance */ | |
7622fc06 SK |
1985 | for (enc_len = 0, start = opt; opt; opt = opt->next) |
1986 | if (opt->flags & flag) | |
73a08a24 SK |
1987 | { |
1988 | int new = do_opt(opt, NULL, NULL, null_term) + 2; | |
8ef5ada2 | 1989 | ret = 1; |
73a08a24 SK |
1990 | if (enc_len + new <= 255) |
1991 | enc_len += new; | |
1992 | else | |
1993 | { | |
1994 | p = free_space(mess, end, encap, enc_len); | |
1995 | for (; start && start != opt; start = start->next) | |
7622fc06 | 1996 | if (p && (start->flags & flag)) |
73a08a24 SK |
1997 | { |
1998 | len = do_opt(start, p + 2, NULL, null_term); | |
1999 | *(p++) = start->opt; | |
2000 | *(p++) = len; | |
2001 | p += len; | |
2002 | } | |
2003 | enc_len = new; | |
2004 | start = opt; | |
2005 | } | |
2006 | } | |
2007 | ||
2008 | if (enc_len != 0 && | |
2009 | (p = free_space(mess, end, encap, enc_len + 1))) | |
2010 | { | |
2011 | for (; start; start = start->next) | |
7622fc06 | 2012 | if (start->flags & flag) |
73a08a24 SK |
2013 | { |
2014 | len = do_opt(start, p + 2, NULL, null_term); | |
2015 | *(p++) = start->opt; | |
2016 | *(p++) = len; | |
2017 | p += len; | |
2018 | } | |
2019 | *p = OPTION_END; | |
2020 | } | |
8ef5ada2 SK |
2021 | |
2022 | return ret; | |
73a08a24 SK |
2023 | } |
2024 | ||
7622fc06 | 2025 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid) |
91dccd09 | 2026 | { |
7622fc06 SK |
2027 | unsigned char *p; |
2028 | ||
2029 | option_put_string(mess, end, OPTION_VENDOR_ID, "PXEClient", 0); | |
2030 | if (uuid && (p = free_space(mess, end, OPTION_PXE_UUID, 17))) | |
2031 | memcpy(p, uuid, 17); | |
2032 | } | |
2033 | ||
2034 | static int prune_vendor_opts(struct dhcp_netid *netid) | |
2035 | { | |
2036 | int force = 0; | |
2037 | struct dhcp_opt *opt; | |
9e038946 | 2038 | |
7622fc06 SK |
2039 | /* prune vendor-encapsulated options based on netid, and look if we're forcing them to be sent */ |
2040 | for (opt = daemon->dhcp_opts; opt; opt = opt->next) | |
2041 | if (opt->flags & DHOPT_VENDOR_MATCH) | |
2042 | { | |
2043 | if (!match_netid(opt->netid, netid, 1)) | |
2044 | opt->flags &= ~DHOPT_VENDOR_MATCH; | |
2045 | else if (opt->flags & DHOPT_FORCE) | |
2046 | force = 1; | |
2047 | } | |
2048 | return force; | |
2049 | } | |
2050 | ||
316e2730 | 2051 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid, struct in_addr local) |
7622fc06 SK |
2052 | { |
2053 | #define NUM_OPTS 4 | |
2054 | ||
2055 | unsigned char *p, *q; | |
2056 | struct pxe_service *service; | |
2057 | static struct dhcp_opt *o, *ret; | |
2058 | int i, j = NUM_OPTS - 1; | |
316e2730 | 2059 | struct in_addr boot_server; |
7622fc06 SK |
2060 | |
2061 | /* We pass back references to these, hence they are declared static */ | |
2062 | static unsigned char discovery_control; | |
2063 | static unsigned char fake_prompt[] = { 0, 'P', 'X', 'E' }; | |
2064 | static struct dhcp_opt *fake_opts = NULL; | |
2065 | ||
316e2730 SK |
2066 | /* Disable multicast, since we don't support it, and broadcast |
2067 | unless we need it */ | |
2068 | discovery_control = 3; | |
7622fc06 SK |
2069 | |
2070 | ret = daemon->dhcp_opts; | |
2071 | ||
2072 | if (!fake_opts && !(fake_opts = whine_malloc(NUM_OPTS * sizeof(struct dhcp_opt)))) | |
2073 | return ret; | |
2074 | ||
2075 | for (i = 0; i < NUM_OPTS; i++) | |
2076 | { | |
2077 | fake_opts[i].flags = DHOPT_VENDOR_MATCH; | |
2078 | fake_opts[i].netid = NULL; | |
2079 | fake_opts[i].next = i == (NUM_OPTS - 1) ? ret : &fake_opts[i+1]; | |
2080 | } | |
2081 | ||
2082 | /* create the data for the PXE_MENU and PXE_SERVERS options. */ | |
2083 | p = (unsigned char *)daemon->dhcp_buff; | |
8ef5ada2 | 2084 | q = (unsigned char *)daemon->dhcp_buff3; |
7622fc06 SK |
2085 | |
2086 | for (i = 0, service = daemon->pxe_services; service; service = service->next) | |
2087 | if (pxe_arch == service->CSA && match_netid(service->netid, netid, 1)) | |
2088 | { | |
2089 | size_t len = strlen(service->menu); | |
2090 | /* opt 43 max size is 255. encapsulated option has type and length | |
2091 | bytes, so its max size is 253. */ | |
2092 | if (p - (unsigned char *)daemon->dhcp_buff + len + 3 < 253) | |
2093 | { | |
2094 | *(p++) = service->type >> 8; | |
2095 | *(p++) = service->type; | |
2096 | *(p++) = len; | |
2097 | memcpy(p, service->menu, len); | |
2098 | p += len; | |
2099 | i++; | |
2100 | } | |
2101 | else | |
2102 | { | |
2103 | toobig: | |
2104 | my_syslog(MS_DHCP | LOG_ERR, _("PXE menu too large")); | |
2105 | return daemon->dhcp_opts; | |
2106 | } | |
2107 | ||
316e2730 SK |
2108 | boot_server = service->basename ? local : service->server; |
2109 | ||
2110 | if (boot_server.s_addr != 0) | |
7622fc06 | 2111 | { |
8ef5ada2 | 2112 | if (q - (unsigned char *)daemon->dhcp_buff3 + 3 + INADDRSZ >= 253) |
316e2730 SK |
2113 | goto toobig; |
2114 | ||
2115 | /* Boot service with known address - give it */ | |
2116 | *(q++) = service->type >> 8; | |
2117 | *(q++) = service->type; | |
2118 | *(q++) = 1; | |
2119 | /* dest misaligned */ | |
2120 | memcpy(q, &boot_server.s_addr, INADDRSZ); | |
2121 | q += INADDRSZ; | |
2122 | } | |
2123 | else if (service->type != 0) | |
2124 | /* We don't know the server for a service type, so we'll | |
2125 | allow the client to broadcast for it */ | |
2126 | discovery_control = 2; | |
7622fc06 SK |
2127 | } |
2128 | ||
2129 | /* if no prompt, wait forever if there's a choice */ | |
2130 | fake_prompt[0] = (i > 1) ? 255 : 0; | |
2131 | ||
2132 | if (i == 0) | |
2133 | discovery_control = 8; /* no menu - just use use mess->filename */ | |
2134 | else | |
2135 | { | |
2136 | ret = &fake_opts[j--]; | |
2137 | ret->len = p - (unsigned char *)daemon->dhcp_buff; | |
2138 | ret->val = (unsigned char *)daemon->dhcp_buff; | |
2139 | ret->opt = SUBOPT_PXE_MENU; | |
2140 | ||
8ef5ada2 | 2141 | if (q - (unsigned char *)daemon->dhcp_buff3 != 0) |
7622fc06 SK |
2142 | { |
2143 | ret = &fake_opts[j--]; | |
8ef5ada2 SK |
2144 | ret->len = q - (unsigned char *)daemon->dhcp_buff3; |
2145 | ret->val = (unsigned char *)daemon->dhcp_buff3; | |
7622fc06 SK |
2146 | ret->opt = SUBOPT_PXE_SERVERS; |
2147 | } | |
2148 | } | |
2149 | ||
2150 | for (o = daemon->dhcp_opts; o; o = o->next) | |
2151 | if ((o->flags & DHOPT_VENDOR_MATCH) && o->opt == SUBOPT_PXE_MENU_PROMPT) | |
2152 | break; | |
2153 | ||
2154 | if (!o) | |
2155 | { | |
2156 | ret = &fake_opts[j--]; | |
2157 | ret->len = sizeof(fake_prompt); | |
2158 | ret->val = fake_prompt; | |
2159 | ret->opt = SUBOPT_PXE_MENU_PROMPT; | |
2160 | } | |
2161 | ||
316e2730 SK |
2162 | ret = &fake_opts[j--]; |
2163 | ret->len = 1; | |
2164 | ret->opt = SUBOPT_PXE_DISCOVERY; | |
2165 | ret->val= &discovery_control; | |
2166 | ||
7622fc06 SK |
2167 | return ret; |
2168 | } | |
2169 | ||
2170 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end) | |
2171 | { | |
1b7ecd11 SK |
2172 | memset(mess->sname, 0, sizeof(mess->sname)); |
2173 | memset(mess->file, 0, sizeof(mess->file)); | |
2174 | memset(&mess->options[0] + sizeof(u32), 0, end - (&mess->options[0] + sizeof(u32))); | |
2175 | mess->siaddr.s_addr = 0; | |
2176 | } | |
cdeda28f | 2177 | |
7622fc06 SK |
2178 | struct dhcp_boot *find_boot(struct dhcp_netid *netid) |
2179 | { | |
2180 | struct dhcp_boot *boot; | |
2181 | ||
2182 | /* decide which dhcp-boot option we're using */ | |
2183 | for (boot = daemon->boot_config; boot; boot = boot->next) | |
2184 | if (match_netid(boot->netid, netid, 0)) | |
2185 | break; | |
2186 | if (!boot) | |
2187 | /* No match, look for one without a netid */ | |
2188 | for (boot = daemon->boot_config; boot; boot = boot->next) | |
2189 | if (match_netid(boot->netid, netid, 1)) | |
2190 | break; | |
2191 | ||
2192 | return boot; | |
9e038946 SK |
2193 | } |
2194 | ||
1b7ecd11 SK |
2195 | static void do_options(struct dhcp_context *context, |
2196 | struct dhcp_packet *mess, | |
7622fc06 | 2197 | unsigned char *end, |
1b7ecd11 | 2198 | unsigned char *req_options, |
9009d746 SK |
2199 | char *hostname, |
2200 | char *domain, char *config_domain, | |
1b7ecd11 SK |
2201 | struct dhcp_netid *netid, |
2202 | struct in_addr subnet_addr, | |
2203 | unsigned char fqdn_flags, | |
7622fc06 | 2204 | int null_term, int pxe_arch, |
8ef5ada2 | 2205 | unsigned char *uuid, |
7de060b0 SK |
2206 | int vendor_class_len, |
2207 | time_t now) | |
1b7ecd11 SK |
2208 | { |
2209 | struct dhcp_opt *opt, *config_opts = daemon->dhcp_opts; | |
2210 | struct dhcp_boot *boot; | |
7622fc06 | 2211 | unsigned char *p; |
f2621c7f | 2212 | int i, len, force_encap = 0; |
1b7ecd11 | 2213 | unsigned char f0 = 0, s0 = 0; |
824af85b | 2214 | int done_file = 0, done_server = 0; |
8ef5ada2 | 2215 | int done_vendor_class = 0; |
7de060b0 SK |
2216 | struct dhcp_netid *tagif; |
2217 | struct dhcp_netid_list *id_list; | |
2218 | ||
2219 | /* flag options which are valid with the current tag set (sans context tags) */ | |
2220 | tagif = run_tag_if(netid); | |
2221 | for (opt = config_opts; opt; opt = opt->next) | |
2222 | { | |
2223 | opt->flags &= ~DHOPT_TAGOK; | |
2224 | if (!(opt->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR | DHOPT_RFC3925)) && | |
2225 | match_netid(opt->netid, tagif, 0)) | |
2226 | opt->flags |= DHOPT_TAGOK; | |
2227 | } | |
1b7ecd11 | 2228 | |
7de060b0 SK |
2229 | /* now flag options which are valid, including the context tags, |
2230 | otherwise valid options are inhibited if we found a higher priotity one above */ | |
2231 | if (context && context->netid.net) | |
2232 | { | |
2233 | context->netid.next = netid; | |
2234 | tagif = run_tag_if(&context->netid); | |
2235 | ||
2236 | for (opt = config_opts; opt; opt = opt->next) | |
2237 | if (!(opt->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR | DHOPT_RFC3925 | DHOPT_TAGOK)) && | |
2238 | match_netid(opt->netid, tagif, 0)) | |
2239 | { | |
2240 | struct dhcp_opt *tmp; | |
2241 | for (tmp = config_opts; tmp; tmp = tmp->next) | |
2242 | if (tmp->opt == opt->opt && opt->netid && (tmp->flags & DHOPT_TAGOK)) | |
2243 | break; | |
2244 | if (!tmp) | |
2245 | opt->flags |= DHOPT_TAGOK; | |
2246 | } | |
2247 | } | |
2248 | ||
2249 | /* now flag untagged options which are not overridden by tagged ones */ | |
2250 | for (opt = config_opts; opt; opt = opt->next) | |
2251 | if (!(opt->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR | DHOPT_RFC3925 | DHOPT_TAGOK)) && !opt->netid) | |
2252 | { | |
2253 | struct dhcp_opt *tmp; | |
2254 | for (tmp = config_opts; tmp; tmp = tmp->next) | |
2255 | if (tmp->opt == opt->opt && (tmp->flags & DHOPT_TAGOK)) | |
2256 | break; | |
2257 | if (!tmp) | |
2258 | opt->flags |= DHOPT_TAGOK; | |
2259 | else if (!tmp->netid) | |
2260 | my_syslog(MS_DHCP | LOG_WARNING, _("Ignoring duplicate dhcp-option %d"), tmp->opt); | |
2261 | } | |
2262 | ||
9009d746 | 2263 | if (config_domain && (!domain || !hostname_isequal(domain, config_domain))) |
7622fc06 | 2264 | my_syslog(MS_DHCP | LOG_WARNING, _("Ignoring domain %s for DHCP host name %s"), config_domain, hostname); |
9009d746 | 2265 | |
f2621c7f | 2266 | /* logging */ |
28866e95 | 2267 | if (option_bool(OPT_LOG_OPTS) && req_options) |
f2621c7f SK |
2268 | { |
2269 | char *q = daemon->namebuff; | |
2270 | for (i = 0; req_options[i] != OPTION_END; i++) | |
2271 | { | |
7622fc06 | 2272 | char *s = option_string(req_options[i], NULL, NULL); |
824af85b SK |
2273 | q += snprintf(q, MAXDNAME - (q - daemon->namebuff), |
2274 | "%d%s%s%s", | |
2275 | req_options[i], | |
2276 | s ? ":" : "", | |
2277 | s ? s : "", | |
2278 | req_options[i+1] == OPTION_END ? "" : ", "); | |
f2621c7f SK |
2279 | if (req_options[i+1] == OPTION_END || (q - daemon->namebuff) > 40) |
2280 | { | |
2281 | q = daemon->namebuff; | |
7622fc06 | 2282 | my_syslog(MS_DHCP | LOG_INFO, _("%u requested options: %s"), ntohl(mess->xid), daemon->namebuff); |
f2621c7f SK |
2283 | } |
2284 | } | |
2285 | } | |
2286 | ||
7de060b0 SK |
2287 | for (id_list = daemon->force_broadcast; id_list; id_list = id_list->next) |
2288 | if ((!id_list->list) || match_netid(id_list->list, netid, 0)) | |
2289 | break; | |
2290 | if (id_list) | |
2291 | mess->flags |= htons(0x8000); /* force broadcast */ | |
2292 | ||
73a08a24 SK |
2293 | if (context) |
2294 | mess->siaddr = context->local; | |
1b7ecd11 SK |
2295 | |
2296 | /* See if we can send the boot stuff as options. | |
2297 | To do this we need a requested option list, BOOTP | |
824af85b SK |
2298 | and very old DHCP clients won't have this, we also |
2299 | provide an manual option to disable it. | |
1b7ecd11 | 2300 | Some PXE ROMs have bugs (surprise!) and need zero-terminated |
7622fc06 | 2301 | names, so we always send those. */ |
7de060b0 | 2302 | if ((boot = find_boot(tagif))) |
91dccd09 | 2303 | { |
1b7ecd11 | 2304 | if (boot->sname) |
824af85b | 2305 | { |
28866e95 | 2306 | if (!option_bool(OPT_NO_OVERRIDE) && |
824af85b SK |
2307 | req_options && |
2308 | in_list(req_options, OPTION_SNAME)) | |
1b7ecd11 | 2309 | option_put_string(mess, end, OPTION_SNAME, boot->sname, 1); |
91dccd09 | 2310 | else |
824af85b | 2311 | strncpy((char *)mess->sname, boot->sname, sizeof(mess->sname)-1); |
91dccd09 | 2312 | } |
1b7ecd11 SK |
2313 | |
2314 | if (boot->file) | |
2315 | { | |
28866e95 | 2316 | if (!option_bool(OPT_NO_OVERRIDE) && |
824af85b SK |
2317 | req_options && |
2318 | in_list(req_options, OPTION_FILENAME)) | |
1b7ecd11 SK |
2319 | option_put_string(mess, end, OPTION_FILENAME, boot->file, 1); |
2320 | else | |
824af85b | 2321 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); |
1b7ecd11 SK |
2322 | } |
2323 | ||
7de060b0 | 2324 | if (boot->next_server.s_addr) |
1b7ecd11 | 2325 | mess->siaddr = boot->next_server; |
7de060b0 SK |
2326 | else if (boot->tftp_sname) |
2327 | mess->siaddr = a_record_from_hosts(boot->tftp_sname, now); | |
91dccd09 | 2328 | } |
824af85b SK |
2329 | else |
2330 | /* Use the values of the relevant options if no dhcp-boot given and | |
1f15b81d SK |
2331 | they're not explicitly asked for as options. OPTION_END is used |
2332 | as an internal way to specify siaddr without using dhcp-boot, for use in | |
2333 | dhcp-optsfile. */ | |
824af85b | 2334 | { |
8ef5ada2 | 2335 | if ((!req_options || !in_list(req_options, OPTION_FILENAME)) && |
7de060b0 | 2336 | (opt = option_find2(OPTION_FILENAME)) && !(opt->flags & DHOPT_FORCE)) |
824af85b SK |
2337 | { |
2338 | strncpy((char *)mess->file, (char *)opt->val, sizeof(mess->file)-1); | |
2339 | done_file = 1; | |
2340 | } | |
7622fc06 | 2341 | |
824af85b | 2342 | if ((!req_options || !in_list(req_options, OPTION_SNAME)) && |
7de060b0 | 2343 | (opt = option_find2(OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE)) |
824af85b SK |
2344 | { |
2345 | strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess->sname)-1); | |
2346 | done_server = 1; | |
2347 | } | |
1f15b81d | 2348 | |
7de060b0 | 2349 | if ((opt = option_find2(OPTION_END))) |
1f15b81d | 2350 | mess->siaddr.s_addr = ((struct in_addr *)opt->val)->s_addr; |
824af85b | 2351 | } |
7622fc06 | 2352 | |
1b7ecd11 SK |
2353 | /* We don't want to do option-overload for BOOTP, so make the file and sname |
2354 | fields look like they are in use, even when they aren't. This gets restored | |
2355 | at the end of this function. */ | |
2356 | ||
28866e95 | 2357 | if (!req_options || option_bool(OPT_NO_OVERRIDE)) |
91dccd09 | 2358 | { |
1b7ecd11 SK |
2359 | f0 = mess->file[0]; |
2360 | mess->file[0] = 1; | |
2361 | s0 = mess->sname[0]; | |
2362 | mess->sname[0] = 1; | |
91dccd09 | 2363 | } |
1b7ecd11 SK |
2364 | |
2365 | /* At this point, if mess->sname or mess->file are zeroed, they are available | |
2366 | for option overload, reserve space for the overload option. */ | |
2367 | if (mess->file[0] == 0 || mess->sname[0] == 0) | |
2368 | end -= 3; | |
91dccd09 | 2369 | |
3be34541 SK |
2370 | /* rfc3011 says this doesn't need to be in the requested options list. */ |
2371 | if (subnet_addr.s_addr) | |
1b7ecd11 | 2372 | option_put(mess, end, OPTION_SUBNET_SELECT, INADDRSZ, ntohl(subnet_addr.s_addr)); |
9e4abcb5 | 2373 | |
73a08a24 SK |
2374 | /* replies to DHCPINFORM may not have a valid context */ |
2375 | if (context) | |
2376 | { | |
7de060b0 | 2377 | if (!option_find2(OPTION_NETMASK)) |
73a08a24 | 2378 | option_put(mess, end, OPTION_NETMASK, INADDRSZ, ntohl(context->netmask.s_addr)); |
9e4abcb5 | 2379 | |
73a08a24 SK |
2380 | /* May not have a "guessed" broadcast address if we got no packets via a relay |
2381 | from this net yet (ie just unicast renewals after a restart */ | |
2382 | if (context->broadcast.s_addr && | |
7de060b0 | 2383 | !option_find2(OPTION_BROADCAST)) |
73a08a24 SK |
2384 | option_put(mess, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr)); |
2385 | ||
2386 | /* Same comments as broadcast apply, and also may not be able to get a sensible | |
2387 | default when using subnet select. User must configure by steam in that case. */ | |
2388 | if (context->router.s_addr && | |
2389 | in_list(req_options, OPTION_ROUTER) && | |
7de060b0 | 2390 | !option_find2(OPTION_ROUTER)) |
73a08a24 SK |
2391 | option_put(mess, end, OPTION_ROUTER, INADDRSZ, ntohl(context->router.s_addr)); |
2392 | ||
2393 | if (in_list(req_options, OPTION_DNSSERVER) && | |
7de060b0 | 2394 | !option_find2(OPTION_DNSSERVER)) |
73a08a24 SK |
2395 | option_put(mess, end, OPTION_DNSSERVER, INADDRSZ, ntohl(context->local.s_addr)); |
2396 | } | |
2397 | ||
9009d746 | 2398 | if (domain && in_list(req_options, OPTION_DOMAINNAME) && |
7de060b0 | 2399 | !option_find2(OPTION_DOMAINNAME)) |
9009d746 | 2400 | option_put_string(mess, end, OPTION_DOMAINNAME, domain, null_term); |
9e4abcb5 | 2401 | |
824af85b | 2402 | /* Note that we ignore attempts to set the fqdn using --dhc-option=81,<name> */ |
3d8df260 SK |
2403 | if (hostname) |
2404 | { | |
824af85b | 2405 | if (in_list(req_options, OPTION_HOSTNAME) && |
7de060b0 | 2406 | !option_find2(OPTION_HOSTNAME)) |
1b7ecd11 | 2407 | option_put_string(mess, end, OPTION_HOSTNAME, hostname, null_term); |
3d8df260 SK |
2408 | |
2409 | if (fqdn_flags != 0) | |
2410 | { | |
73a08a24 SK |
2411 | len = strlen(hostname) + 3; |
2412 | ||
3d8df260 SK |
2413 | if (fqdn_flags & 0x04) |
2414 | len += 2; | |
cdeda28f SK |
2415 | else if (null_term) |
2416 | len++; | |
2417 | ||
9009d746 SK |
2418 | if (domain) |
2419 | len += strlen(domain) + 1; | |
3d8df260 | 2420 | |
1b7ecd11 | 2421 | if ((p = free_space(mess, end, OPTION_CLIENT_FQDN, len))) |
3d8df260 | 2422 | { |
3d8df260 SK |
2423 | *(p++) = fqdn_flags; |
2424 | *(p++) = 255; | |
2425 | *(p++) = 255; | |
2426 | ||
2427 | if (fqdn_flags & 0x04) | |
2428 | { | |
2429 | p = do_rfc1035_name(p, hostname); | |
9009d746 SK |
2430 | if (domain) |
2431 | p = do_rfc1035_name(p, domain); | |
3d8df260 SK |
2432 | *p++ = 0; |
2433 | } | |
2434 | else | |
2435 | { | |
2436 | memcpy(p, hostname, strlen(hostname)); | |
2437 | p += strlen(hostname); | |
9009d746 | 2438 | if (domain) |
3d8df260 SK |
2439 | { |
2440 | *(p++) = '.'; | |
9009d746 SK |
2441 | memcpy(p, domain, strlen(domain)); |
2442 | p += strlen(domain); | |
cdeda28f SK |
2443 | } |
2444 | if (null_term) | |
2445 | *(p++) = 0; | |
3d8df260 SK |
2446 | } |
2447 | } | |
2448 | } | |
2449 | } | |
2450 | ||
6b01084f | 2451 | for (opt = config_opts; opt; opt = opt->next) |
9e4abcb5 | 2452 | { |
824af85b SK |
2453 | int optno = opt->opt; |
2454 | ||
7de060b0 SK |
2455 | /* netids match and not encapsulated? */ |
2456 | if (!(opt->flags & DHOPT_TAGOK)) | |
2457 | continue; | |
2458 | ||
6b01084f | 2459 | /* was it asked for, or are we sending it anyway? */ |
824af85b | 2460 | if (!(opt->flags & DHOPT_FORCE) && !in_list(req_options, optno)) |
6b01084f SK |
2461 | continue; |
2462 | ||
2463 | /* prohibit some used-internally options */ | |
824af85b SK |
2464 | if (optno == OPTION_CLIENT_FQDN || |
2465 | optno == OPTION_MAXMESSAGE || | |
2466 | optno == OPTION_OVERLOAD || | |
2467 | optno == OPTION_PAD || | |
2468 | optno == OPTION_END) | |
2469 | continue; | |
2470 | ||
2471 | if (optno == OPTION_SNAME && done_server) | |
2472 | continue; | |
2473 | ||
2474 | if (optno == OPTION_FILENAME && done_file) | |
6b01084f SK |
2475 | continue; |
2476 | ||
33820b7e SK |
2477 | /* For the options we have default values on |
2478 | dhc-option=<optionno> means "don't include this option" | |
2479 | not "include a zero-length option" */ | |
2480 | if (opt->len == 0 && | |
824af85b SK |
2481 | (optno == OPTION_NETMASK || |
2482 | optno == OPTION_BROADCAST || | |
2483 | optno == OPTION_ROUTER || | |
2484 | optno == OPTION_DNSSERVER || | |
2485 | optno == OPTION_DOMAINNAME || | |
2486 | optno == OPTION_HOSTNAME)) | |
33820b7e | 2487 | continue; |
7622fc06 SK |
2488 | |
2489 | /* vendor-class comes from elsewhere for PXE */ | |
2490 | if (pxe_arch != -1 && optno == OPTION_VENDOR_ID) | |
2491 | continue; | |
824af85b | 2492 | |
7622fc06 | 2493 | /* always force null-term for filename and servername - buggy PXE again. */ |
73a08a24 | 2494 | len = do_opt(opt, NULL, context, |
824af85b | 2495 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
91dccd09 | 2496 | |
824af85b | 2497 | if ((p = free_space(mess, end, optno, len))) |
6b01084f | 2498 | { |
73a08a24 | 2499 | do_opt(opt, p, context, |
824af85b SK |
2500 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
2501 | ||
6b01084f SK |
2502 | /* If we send a vendor-id, revisit which vendor-ops we consider |
2503 | it appropriate to send. */ | |
824af85b | 2504 | if (optno == OPTION_VENDOR_ID) |
8ef5ada2 SK |
2505 | { |
2506 | match_vendor_opts(p - 2, config_opts); | |
2507 | done_vendor_class = 1; | |
2508 | } | |
6b01084f SK |
2509 | } |
2510 | } | |
91dccd09 | 2511 | |
73a08a24 SK |
2512 | /* Now send options to be encapsulated in arbitrary options, |
2513 | eg dhcp-option=encap:172,17,....... | |
316e2730 SK |
2514 | Also hand vendor-identifying vendor-encapsulated options, |
2515 | dhcp-option = rfc3925-encap:13,17,....... | |
73a08a24 SK |
2516 | The may be more that one "outer" to do, so group |
2517 | all the options which match each outer in turn. */ | |
7622fc06 SK |
2518 | for (opt = config_opts; opt; opt = opt->next) |
2519 | opt->flags &= ~DHOPT_ENCAP_DONE; | |
2520 | ||
73a08a24 | 2521 | for (opt = config_opts; opt; opt = opt->next) |
316e2730 SK |
2522 | { |
2523 | int flags; | |
2524 | ||
2525 | if ((flags = (opt->flags & (DHOPT_ENCAPSULATE | DHOPT_RFC3925)))) | |
2526 | { | |
2527 | int found = 0; | |
2528 | struct dhcp_opt *o; | |
2529 | ||
2530 | if (opt->flags & DHOPT_ENCAP_DONE) | |
2531 | continue; | |
2532 | ||
2533 | for (len = 0, o = config_opts; o; o = o->next) | |
2534 | { | |
2535 | int outer = flags & DHOPT_ENCAPSULATE ? o->u.encap : OPTION_VENDOR_IDENT_OPT; | |
2536 | ||
2537 | o->flags &= ~DHOPT_ENCAP_MATCH; | |
2538 | ||
2539 | if (!(o->flags & flags) || opt->u.encap != o->u.encap) | |
2540 | continue; | |
2541 | ||
2542 | o->flags |= DHOPT_ENCAP_DONE; | |
7de060b0 | 2543 | if (match_netid(o->netid, tagif, 1) && |
316e2730 SK |
2544 | ((o->flags & DHOPT_FORCE) || in_list(req_options, outer))) |
2545 | { | |
2546 | o->flags |= DHOPT_ENCAP_MATCH; | |
2547 | found = 1; | |
2548 | len += do_opt(o, NULL, NULL, 0) + 2; | |
2549 | } | |
2550 | } | |
2551 | ||
2552 | if (found) | |
2553 | { | |
2554 | if (flags & DHOPT_ENCAPSULATE) | |
2555 | do_encap_opts(config_opts, opt->u.encap, DHOPT_ENCAP_MATCH, mess, end, null_term); | |
2556 | else if (len > 250) | |
2557 | my_syslog(MS_DHCP | LOG_WARNING, _("cannot send RFC3925 option: too many options for enterprise number %d"), opt->u.encap); | |
2558 | else if ((p = free_space(mess, end, OPTION_VENDOR_IDENT_OPT, len + 5))) | |
2559 | { | |
2560 | int swap_ent = htonl(opt->u.encap); | |
2561 | memcpy(p, &swap_ent, 4); | |
2562 | p += 4; | |
2563 | *(p++) = len; | |
2564 | for (o = config_opts; o; o = o->next) | |
2565 | if (o->flags & DHOPT_ENCAP_MATCH) | |
2566 | { | |
2567 | len = do_opt(o, p + 2, NULL, 0); | |
2568 | *(p++) = o->opt; | |
2569 | *(p++) = len; | |
2570 | p += len; | |
2571 | } | |
2572 | } | |
2573 | } | |
2574 | } | |
2575 | } | |
73a08a24 | 2576 | |
7de060b0 | 2577 | force_encap = prune_vendor_opts(tagif); |
8ef5ada2 | 2578 | |
316e2730 | 2579 | if (context && pxe_arch != -1) |
7622fc06 SK |
2580 | { |
2581 | pxe_misc(mess, end, uuid); | |
7de060b0 | 2582 | config_opts = pxe_opts(pxe_arch, tagif, context->local); |
7622fc06 | 2583 | } |
9e4abcb5 | 2584 | |
8ef5ada2 SK |
2585 | if ((force_encap || in_list(req_options, OPTION_VENDOR_CLASS_OPT)) && |
2586 | do_encap_opts(config_opts, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, null_term) && | |
2587 | pxe_arch == -1 && !done_vendor_class && vendor_class_len != 0 && | |
2588 | (p = free_space(mess, end, OPTION_VENDOR_ID, vendor_class_len))) | |
2589 | /* If we send vendor encapsulated options, and haven't already sent option 60, | |
2590 | echo back the value we got from the client. */ | |
2591 | memcpy(p, daemon->dhcp_buff3, vendor_class_len); | |
2592 | ||
7622fc06 | 2593 | /* restore BOOTP anti-overload hack */ |
28866e95 | 2594 | if (!req_options || option_bool(OPT_NO_OVERRIDE)) |
1b7ecd11 SK |
2595 | { |
2596 | mess->file[0] = f0; | |
2597 | mess->sname[0] = s0; | |
2598 | } | |
2599 | } | |
9e4abcb5 | 2600 | |
7622fc06 SK |
2601 | #endif |
2602 | ||
2603 | ||
2604 | ||
2605 | ||
2606 | ||
2607 | ||
2608 |