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28866e95 | 1 | /* dnsmasq is Copyright (c) 2000-2011 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 | ||
9e4abcb5 SK |
21 | #define BOOTREQUEST 1 |
22 | #define BOOTREPLY 2 | |
23 | #define DHCP_COOKIE 0x63825363 | |
24 | ||
a222641c SK |
25 | /* The Linux in-kernel DHCP client silently ignores any packet |
26 | smaller than this. Sigh........... */ | |
27 | #define MIN_PACKETSZ 300 | |
28 | ||
9e4abcb5 SK |
29 | #define OPTION_PAD 0 |
30 | #define OPTION_NETMASK 1 | |
31 | #define OPTION_ROUTER 3 | |
32 | #define OPTION_DNSSERVER 6 | |
33 | #define OPTION_HOSTNAME 12 | |
34 | #define OPTION_DOMAINNAME 15 | |
35 | #define OPTION_BROADCAST 28 | |
91dccd09 | 36 | #define OPTION_VENDOR_CLASS_OPT 43 |
9e4abcb5 SK |
37 | #define OPTION_REQUESTED_IP 50 |
38 | #define OPTION_LEASE_TIME 51 | |
39 | #define OPTION_OVERLOAD 52 | |
40 | #define OPTION_MESSAGE_TYPE 53 | |
41 | #define OPTION_SERVER_IDENTIFIER 54 | |
42 | #define OPTION_REQUESTED_OPTIONS 55 | |
44a2a316 | 43 | #define OPTION_MESSAGE 56 |
9e4abcb5 | 44 | #define OPTION_MAXMESSAGE 57 |
44a2a316 SK |
45 | #define OPTION_T1 58 |
46 | #define OPTION_T2 59 | |
a84fa1d0 | 47 | #define OPTION_VENDOR_ID 60 |
44a2a316 | 48 | #define OPTION_CLIENT_ID 61 |
1b7ecd11 SK |
49 | #define OPTION_SNAME 66 |
50 | #define OPTION_FILENAME 67 | |
a222641c | 51 | #define OPTION_USER_CLASS 77 |
3d8df260 | 52 | #define OPTION_CLIENT_FQDN 81 |
5e9e0efb | 53 | #define OPTION_AGENT_ID 82 |
7622fc06 SK |
54 | #define OPTION_ARCH 93 |
55 | #define OPTION_PXE_UUID 97 | |
3be34541 | 56 | #define OPTION_SUBNET_SELECT 118 |
316e2730 SK |
57 | #define OPTION_VENDOR_IDENT 124 |
58 | #define OPTION_VENDOR_IDENT_OPT 125 | |
9e4abcb5 SK |
59 | #define OPTION_END 255 |
60 | ||
f2621c7f SK |
61 | #define SUBOPT_CIRCUIT_ID 1 |
62 | #define SUBOPT_REMOTE_ID 2 | |
5e9e0efb | 63 | #define SUBOPT_SUBNET_SELECT 5 /* RFC 3527 */ |
f2621c7f | 64 | #define SUBOPT_SUBSCR_ID 6 /* RFC 3393 */ |
7622fc06 SK |
65 | #define SUBOPT_SERVER_OR 11 /* RFC 5107 */ |
66 | ||
67 | #define SUBOPT_PXE_BOOT_ITEM 71 /* PXE standard */ | |
68 | #define SUBOPT_PXE_DISCOVERY 6 | |
69 | #define SUBOPT_PXE_SERVERS 8 | |
70 | #define SUBOPT_PXE_MENU 9 | |
71 | #define SUBOPT_PXE_MENU_PROMPT 10 | |
5e9e0efb | 72 | |
9e4abcb5 SK |
73 | #define DHCPDISCOVER 1 |
74 | #define DHCPOFFER 2 | |
75 | #define DHCPREQUEST 3 | |
76 | #define DHCPDECLINE 4 | |
77 | #define DHCPACK 5 | |
78 | #define DHCPNAK 6 | |
79 | #define DHCPRELEASE 7 | |
80 | #define DHCPINFORM 8 | |
81 | ||
316e2730 SK |
82 | #define BRDBAND_FORUM_IANA 3561 /* Broadband forum IANA enterprise */ |
83 | ||
0a852541 | 84 | #define have_config(config, mask) ((config) && ((config)->flags & (mask))) |
5e9e0efb | 85 | #define option_len(opt) ((int)(((unsigned char *)(opt))[1])) |
1a6bca81 | 86 | #define option_ptr(opt, i) ((void *)&(((unsigned char *)(opt))[2u+(unsigned int)(i)])) |
0a852541 | 87 | |
316e2730 SK |
88 | #ifdef HAVE_SCRIPT |
89 | static void add_extradata_data(struct dhcp_lease *lease, unsigned char *data, size_t len, int delim); | |
90 | static void add_extradata_opt(struct dhcp_lease *lease, unsigned char *opt); | |
91 | #endif | |
92 | static int match_bytes(struct dhcp_opt *o, unsigned char *p, int len); | |
f2621c7f | 93 | static int sanitise(unsigned char *opt, char *buf); |
73a08a24 | 94 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback); |
824af85b | 95 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt); |
1b7ecd11 SK |
96 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val); |
97 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, | |
98 | int opt, char *string, int null_term); | |
9e4abcb5 | 99 | static struct in_addr option_addr(unsigned char *opt); |
7622fc06 SK |
100 | static struct in_addr option_addr_arr(unsigned char *opt, int offset); |
101 | static unsigned int option_uint(unsigned char *opt, int i, int size); | |
102 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, | |
103 | int mac_len, char *interface, char *string, u32 xid); | |
cdeda28f | 104 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize); |
5e9e0efb | 105 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize); |
7622fc06 SK |
106 | static size_t dhcp_packet_size(struct dhcp_packet *mess, struct dhcp_netid *netid, |
107 | unsigned char *agent_id, unsigned char *real_end); | |
108 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end); | |
1b7ecd11 SK |
109 | static void do_options(struct dhcp_context *context, |
110 | struct dhcp_packet *mess, | |
111 | unsigned char *real_end, | |
112 | unsigned char *req_options, | |
9009d746 SK |
113 | char *hostname, |
114 | char *domain, char *config_domain, | |
1b7ecd11 SK |
115 | struct dhcp_netid *netid, |
116 | struct in_addr subnet_addr, | |
117 | unsigned char fqdn_flags, | |
7622fc06 | 118 | int null_term, int pxearch, |
8ef5ada2 SK |
119 | unsigned char *uuid, |
120 | int vendor_class_len); | |
7622fc06 | 121 | |
9009d746 | 122 | |
6b01084f | 123 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt); |
8ef5ada2 | 124 | 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 |
125 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid); |
126 | static int prune_vendor_opts(struct dhcp_netid *netid); | |
316e2730 | 127 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid, struct in_addr local); |
7622fc06 SK |
128 | struct dhcp_boot *find_boot(struct dhcp_netid *netid); |
129 | ||
130 | ||
824af85b | 131 | size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, |
316e2730 | 132 | size_t sz, time_t now, int unicast_dest, int *is_inform, int pxe) |
9e4abcb5 | 133 | { |
26128d27 | 134 | unsigned char *opt, *clid = NULL; |
0a852541 | 135 | struct dhcp_lease *ltmp, *lease = NULL; |
a222641c | 136 | struct dhcp_vendor *vendor; |
cdeda28f | 137 | struct dhcp_mac *mac; |
26128d27 | 138 | struct dhcp_netid_list *id_list; |
7622fc06 | 139 | int clid_len = 0, ignore = 0, do_classes = 0, selecting = 0, pxearch = -1; |
824af85b | 140 | struct dhcp_packet *mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
1b7ecd11 | 141 | unsigned char *end = (unsigned char *)(mess + 1); |
7622fc06 | 142 | unsigned char *real_end = (unsigned char *)(mess + 1); |
9009d746 | 143 | char *hostname = NULL, *offer_hostname = NULL, *client_hostname = NULL, *domain = NULL; |
cdeda28f | 144 | int hostname_auth = 0, borken_opt = 0; |
3d8df260 | 145 | unsigned char *req_options = NULL; |
44a2a316 | 146 | char *message = NULL; |
59353a6b | 147 | unsigned int time; |
9e4abcb5 | 148 | struct dhcp_config *config; |
8ef5ada2 | 149 | struct dhcp_netid *netid, *tagif_netid; |
1a6bca81 | 150 | struct in_addr subnet_addr, fallback, override; |
a84fa1d0 | 151 | unsigned short fuzz = 0; |
3be34541 | 152 | unsigned int mess_type = 0; |
3d8df260 | 153 | unsigned char fqdn_flags = 0; |
7622fc06 | 154 | unsigned char *agent_id = NULL, *uuid = NULL; |
1b7ecd11 | 155 | unsigned char *emac = NULL; |
8ef5ada2 | 156 | int vendor_class_len = 0, emac_len = 0; |
316e2730 | 157 | struct dhcp_netid known_id, iface_id, cpewan_id; |
73a08a24 | 158 | struct dhcp_opt *o; |
7622fc06 | 159 | unsigned char pxe_uuid[17]; |
316e2730 | 160 | unsigned char *oui = NULL, *serial = NULL, *class = NULL; |
3be34541 | 161 | |
1a6bca81 | 162 | subnet_addr.s_addr = override.s_addr = 0; |
9009d746 SK |
163 | |
164 | /* set tag with name == interface */ | |
165 | iface_id.net = iface_name; | |
166 | iface_id.next = NULL; | |
167 | netid = &iface_id; | |
849a8357 | 168 | |
5e9e0efb | 169 | if (mess->op != BOOTREQUEST || mess->hlen > DHCP_CHADDR_MAX) |
33820b7e | 170 | return 0; |
cdeda28f | 171 | |
5e9e0efb | 172 | if (mess->htype == 0 && mess->hlen != 0) |
cdeda28f | 173 | return 0; |
5e9e0efb | 174 | |
3be34541 | 175 | /* check for DHCP rather than BOOTP */ |
bb01cb96 | 176 | if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE, 1))) |
3be34541 | 177 | { |
8ef5ada2 SK |
178 | u32 cookie = htonl(DHCP_COOKIE); |
179 | ||
3be34541 | 180 | /* only insist on a cookie for DHCP. */ |
8ef5ada2 | 181 | if (memcmp(mess->options, &cookie, sizeof(u32)) != 0) |
3be34541 | 182 | return 0; |
8ef5ada2 SK |
183 | |
184 | mess_type = option_uint(opt, 0, 1); | |
185 | ||
5e9e0efb SK |
186 | /* two things to note here: expand_buf may move the packet, |
187 | so reassign mess from daemon->packet. Also, the size | |
188 | sent includes the IP and UDP headers, hence the magic "-28" */ | |
189 | if ((opt = option_find(mess, sz, OPTION_MAXMESSAGE, 2))) | |
190 | { | |
7622fc06 | 191 | size_t size = (size_t)option_uint(opt, 0, 2) - 28; |
5e9e0efb SK |
192 | |
193 | if (size > DHCP_PACKET_MAX) | |
194 | size = DHCP_PACKET_MAX; | |
195 | else if (size < sizeof(struct dhcp_packet)) | |
196 | size = sizeof(struct dhcp_packet); | |
197 | ||
198 | if (expand_buf(&daemon->dhcp_packet, size)) | |
199 | { | |
824af85b | 200 | mess = (struct dhcp_packet *)daemon->dhcp_packet.iov_base; |
7622fc06 | 201 | real_end = end = ((unsigned char *)mess) + size; |
5e9e0efb SK |
202 | } |
203 | } | |
204 | ||
3be34541 SK |
205 | /* Some buggy clients set ciaddr when they shouldn't, so clear that here since |
206 | it can affect the context-determination code. */ | |
bb01cb96 | 207 | if ((option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ) || mess_type == DHCPDISCOVER)) |
3be34541 | 208 | mess->ciaddr.s_addr = 0; |
44a2a316 | 209 | |
316e2730 SK |
210 | /* search for device identity from CPEWAN devices, we pass this through to the script */ |
211 | if ((opt = option_find(mess, sz, OPTION_VENDOR_IDENT_OPT, 5))) | |
212 | { | |
213 | unsigned int elen, offset, len = option_len(opt); | |
214 | ||
215 | for (offset = 0; offset < (len - 5); offset += elen + 5) | |
216 | { | |
217 | elen = option_uint(opt, offset + 4 , 1); | |
218 | if (option_uint(opt, offset, 4) == BRDBAND_FORUM_IANA) | |
219 | { | |
220 | unsigned char *x = option_ptr(opt, offset + 5); | |
221 | unsigned char *y = option_ptr(opt, offset + elen + 5); | |
222 | oui = option_find1(x, y, 1, 1); | |
223 | serial = option_find1(x, y, 2, 1); | |
224 | class = option_find1(x, y, 3, 1); | |
225 | ||
226 | /* If TR069-id is present set the tag "cpewan-id" to facilitate echoing | |
227 | the gateway id back. Note that the device class is optional */ | |
228 | if (oui && serial) | |
229 | { | |
230 | cpewan_id.net = "cpewan-id"; | |
231 | cpewan_id.next = netid; | |
232 | netid = &cpewan_id; | |
233 | } | |
234 | break; | |
235 | } | |
236 | } | |
237 | } | |
238 | ||
5e9e0efb SK |
239 | if ((opt = option_find(mess, sz, OPTION_AGENT_ID, 1))) |
240 | { | |
241 | /* Any agent-id needs to be copied back out, verbatim, as the last option | |
242 | in the packet. Here, we shift it to the very end of the buffer, if it doesn't | |
243 | get overwritten, then it will be shuffled back at the end of processing. | |
244 | Note that the incoming options must not be overwritten here, so there has to | |
245 | be enough free space at the end of the packet to copy the option. */ | |
f2621c7f | 246 | unsigned char *sopt; |
5e9e0efb SK |
247 | unsigned int total = option_len(opt) + 2; |
248 | unsigned char *last_opt = option_find(mess, sz, OPTION_END, 0); | |
249 | if (last_opt && last_opt < end - total) | |
250 | { | |
7622fc06 SK |
251 | end -= total; |
252 | agent_id = end; | |
5e9e0efb SK |
253 | memcpy(agent_id, opt, total); |
254 | } | |
255 | ||
256 | /* look for RFC3527 Link selection sub-option */ | |
1a6bca81 | 257 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SUBNET_SELECT, INADDRSZ))) |
f2621c7f | 258 | subnet_addr = option_addr(sopt); |
1a6bca81 SK |
259 | |
260 | /* look for RFC5107 server-identifier-override */ | |
261 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_SERVER_OR, INADDRSZ))) | |
262 | override = option_addr(sopt); | |
f2621c7f SK |
263 | |
264 | /* if a circuit-id or remote-is option is provided, exact-match to options. */ | |
265 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) | |
266 | { | |
267 | int search; | |
268 | ||
269 | if (vendor->match_type == MATCH_CIRCUIT) | |
270 | search = SUBOPT_CIRCUIT_ID; | |
271 | else if (vendor->match_type == MATCH_REMOTE) | |
272 | search = SUBOPT_REMOTE_ID; | |
273 | else if (vendor->match_type == MATCH_SUBSCRIBER) | |
274 | search = SUBOPT_SUBSCR_ID; | |
275 | else | |
276 | continue; | |
277 | ||
1a6bca81 | 278 | if ((sopt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), search, 1)) && |
f2621c7f | 279 | vendor->len == option_len(sopt) && |
1a6bca81 | 280 | memcmp(option_ptr(sopt, 0), vendor->data, vendor->len) == 0) |
f2621c7f SK |
281 | { |
282 | vendor->netid.next = netid; | |
283 | netid = &vendor->netid; | |
f2621c7f SK |
284 | } |
285 | } | |
5e9e0efb | 286 | } |
f2621c7f | 287 | |
5e9e0efb SK |
288 | /* Check for RFC3011 subnet selector - only if RFC3527 one not present */ |
289 | if (subnet_addr.s_addr == 0 && (opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ))) | |
3be34541 | 290 | subnet_addr = option_addr(opt); |
26128d27 SK |
291 | |
292 | /* If there is no client identifier option, use the hardware address */ | |
bb01cb96 | 293 | if ((opt = option_find(mess, sz, OPTION_CLIENT_ID, 1))) |
26128d27 | 294 | { |
26128d27 | 295 | clid_len = option_len(opt); |
1a6bca81 | 296 | clid = option_ptr(opt, 0); |
26128d27 | 297 | } |
1b7ecd11 | 298 | |
0a852541 | 299 | /* do we have a lease in store? */ |
5e9e0efb | 300 | lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, clid, clid_len); |
0a852541 SK |
301 | |
302 | /* If this request is missing a clid, but we've seen one before, | |
303 | use it again for option matching etc. */ | |
304 | if (lease && !clid && lease->clid) | |
305 | { | |
306 | clid_len = lease->clid_len; | |
307 | clid = lease->clid; | |
308 | } | |
1b7ecd11 SK |
309 | |
310 | /* find mac to use for logging and hashing */ | |
311 | emac = extended_hwaddr(mess->htype, mess->hlen, mess->chaddr, clid_len, clid, &emac_len); | |
44a2a316 | 312 | } |
3be34541 | 313 | |
cdeda28f SK |
314 | for (mac = daemon->dhcp_macs; mac; mac = mac->next) |
315 | if (mac->hwaddr_len == mess->hlen && | |
5e9e0efb SK |
316 | (mac->hwaddr_type == mess->htype || mac->hwaddr_type == 0) && |
317 | memcmp_masked(mac->hwaddr, mess->chaddr, mess->hlen, mac->mask)) | |
cdeda28f | 318 | { |
5e9e0efb SK |
319 | mac->netid.next = netid; |
320 | netid = &mac->netid; | |
cdeda28f | 321 | } |
3d8df260 | 322 | |
0a852541 SK |
323 | /* Determine network for this packet. Our caller will have already linked all the |
324 | contexts which match the addresses of the receiving interface but if the | |
325 | machine has an address already, or came via a relay, or we have a subnet selector, | |
326 | we search again. If we don't have have a giaddr or explicit subnet selector, | |
327 | use the ciaddr. This is necessary because a machine which got a lease via a | |
3d8df260 SK |
328 | relay won't use the relay to renew. If matching a ciaddr fails but we have a context |
329 | from the physical network, continue using that to allow correct DHCPNAK generation later. */ | |
0a852541 SK |
330 | if (mess->giaddr.s_addr || subnet_addr.s_addr || mess->ciaddr.s_addr) |
331 | { | |
3d8df260 | 332 | struct dhcp_context *context_tmp, *context_new = NULL; |
1697269c | 333 | struct in_addr addr; |
3d8df260 SK |
334 | int force = 0; |
335 | ||
336 | if (subnet_addr.s_addr) | |
337 | { | |
338 | addr = subnet_addr; | |
339 | force = 1; | |
340 | } | |
341 | else if (mess->giaddr.s_addr) | |
342 | { | |
343 | addr = mess->giaddr; | |
344 | force = 1; | |
345 | } | |
1697269c SK |
346 | else |
347 | { | |
348 | /* If ciaddr is in the hardware derived set of contexts, leave that unchanged */ | |
349 | addr = mess->ciaddr; | |
350 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) | |
351 | if (context_tmp->netmask.s_addr && | |
352 | is_same_net(addr, context_tmp->start, context_tmp->netmask) && | |
353 | is_same_net(addr, context_tmp->end, context_tmp->netmask)) | |
354 | { | |
355 | context_new = context; | |
356 | break; | |
357 | } | |
358 | } | |
359 | ||
360 | if (!context_new) | |
361 | for (context_tmp = daemon->dhcp; context_tmp; context_tmp = context_tmp->next) | |
362 | if (context_tmp->netmask.s_addr && | |
363 | is_same_net(addr, context_tmp->start, context_tmp->netmask) && | |
364 | is_same_net(addr, context_tmp->end, context_tmp->netmask)) | |
365 | { | |
366 | context_tmp->current = context_new; | |
367 | context_new = context_tmp; | |
368 | } | |
0a852541 | 369 | |
3d8df260 SK |
370 | if (context_new || force) |
371 | context = context_new; | |
1697269c | 372 | |
0a852541 | 373 | } |
3be34541 SK |
374 | |
375 | if (!context) | |
376 | { | |
7622fc06 | 377 | my_syslog(MS_DHCP | LOG_WARNING, _("no address range available for DHCP request %s %s"), |
f2621c7f SK |
378 | subnet_addr.s_addr ? _("with subnet selector") : _("via"), |
379 | subnet_addr.s_addr ? inet_ntoa(subnet_addr) : (mess->giaddr.s_addr ? inet_ntoa(mess->giaddr) : iface_name)); | |
3be34541 SK |
380 | return 0; |
381 | } | |
f2621c7f | 382 | |
aedef830 SK |
383 | /* keep _a_ local address available. */ |
384 | fallback = context->local; | |
385 | ||
28866e95 | 386 | if (option_bool(OPT_LOG_OPTS)) |
f2621c7f SK |
387 | { |
388 | struct dhcp_context *context_tmp; | |
f2621c7f SK |
389 | for (context_tmp = context; context_tmp; context_tmp = context_tmp->current) |
390 | { | |
391 | strcpy(daemon->namebuff, inet_ntoa(context_tmp->start)); | |
7622fc06 | 392 | if (context_tmp->flags & (CONTEXT_STATIC | CONTEXT_PROXY)) |
8ef5ada2 | 393 | my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP subnet: %s/%s"), |
7622fc06 | 394 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->netmask)); |
f2621c7f | 395 | else |
8ef5ada2 | 396 | my_syslog(MS_DHCP | LOG_INFO, _("%u available DHCP range: %s -- %s"), |
7622fc06 | 397 | ntohl(mess->xid), daemon->namebuff, inet_ntoa(context_tmp->end)); |
f2621c7f SK |
398 | } |
399 | } | |
400 | ||
3be34541 | 401 | mess->op = BOOTREPLY; |
5e9e0efb | 402 | |
cdeda28f SK |
403 | config = find_config(daemon->dhcp_conf, context, clid, clid_len, |
404 | mess->chaddr, mess->hlen, mess->htype, NULL); | |
5aabfc78 SK |
405 | |
406 | /* set "known" tag for known hosts */ | |
407 | if (config) | |
408 | { | |
409 | known_id.net = "known"; | |
410 | known_id.next = netid; | |
411 | netid = &known_id; | |
412 | } | |
26128d27 | 413 | |
316e2730 | 414 | if (mess_type == 0 && !pxe) |
3be34541 SK |
415 | { |
416 | /* BOOTP request */ | |
6b01084f | 417 | struct dhcp_netid id, bootp_id; |
26128d27 | 418 | struct in_addr *logaddr = NULL; |
5e9e0efb SK |
419 | |
420 | /* must have a MAC addr for bootp */ | |
7622fc06 | 421 | if (mess->htype == 0 || mess->hlen == 0 || (context->flags & CONTEXT_PROXY)) |
5e9e0efb | 422 | return 0; |
26128d27 | 423 | |
26128d27 | 424 | if (have_config(config, CONFIG_DISABLE)) |
b8187c80 | 425 | message = _("disabled"); |
26128d27 SK |
426 | |
427 | end = mess->options + 64; /* BOOTP vend area is only 64 bytes */ | |
428 | ||
429 | if (have_config(config, CONFIG_NAME)) | |
9009d746 SK |
430 | { |
431 | hostname = config->hostname; | |
432 | domain = config->domain; | |
433 | } | |
434 | ||
8ef5ada2 | 435 | if (config) |
26128d27 | 436 | { |
8ef5ada2 SK |
437 | struct dhcp_netid_list *list; |
438 | ||
439 | for (list = config->netid; list; list = list->next) | |
440 | { | |
441 | list->list->next = netid; | |
442 | netid = list->list; | |
443 | } | |
26128d27 SK |
444 | } |
445 | ||
446 | /* Match incoming filename field as a netid. */ | |
447 | if (mess->file[0]) | |
448 | { | |
1b7ecd11 SK |
449 | memcpy(daemon->dhcp_buff2, mess->file, sizeof(mess->file)); |
450 | daemon->dhcp_buff2[sizeof(mess->file) + 1] = 0; /* ensure zero term. */ | |
451 | id.net = (char *)daemon->dhcp_buff2; | |
26128d27 SK |
452 | id.next = netid; |
453 | netid = &id; | |
454 | } | |
6b01084f SK |
455 | |
456 | /* Add "bootp" as a tag to allow different options, address ranges etc | |
457 | for BOOTP clients */ | |
458 | bootp_id.net = "bootp"; | |
459 | bootp_id.next = netid; | |
460 | netid = &bootp_id; | |
26128d27 | 461 | |
8ef5ada2 SK |
462 | tagif_netid = run_tag_if(netid); |
463 | ||
26128d27 | 464 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) |
8ef5ada2 | 465 | if (match_netid(id_list->list, tagif_netid, 0)) |
1f15b81d | 466 | message = _("ignored"); |
26128d27 | 467 | |
3d8df260 SK |
468 | if (!message) |
469 | { | |
9009d746 SK |
470 | int nailed = 0; |
471 | ||
3d8df260 SK |
472 | if (have_config(config, CONFIG_ADDR)) |
473 | { | |
9009d746 | 474 | nailed = 1; |
3d8df260 SK |
475 | logaddr = &config->addr; |
476 | mess->yiaddr = config->addr; | |
477 | if ((lease = lease_find_by_addr(config->addr)) && | |
cdeda28f | 478 | (lease->hwaddr_len != mess->hlen || |
5e9e0efb | 479 | lease->hwaddr_type != mess->htype || |
cdeda28f | 480 | memcmp(lease->hwaddr, mess->chaddr, lease->hwaddr_len) != 0)) |
b8187c80 | 481 | message = _("address in use"); |
3d8df260 | 482 | } |
3d8df260 SK |
483 | else |
484 | { | |
cdeda28f | 485 | if (!(lease = lease_find_by_client(mess->chaddr, mess->hlen, mess->htype, NULL, 0)) || |
8ef5ada2 | 486 | !address_available(context, lease->addr, tagif_netid)) |
e17fb629 SK |
487 | { |
488 | if (lease) | |
489 | { | |
490 | /* lease exists, wrong network. */ | |
491 | lease_prune(lease, now); | |
492 | lease = NULL; | |
493 | } | |
8ef5ada2 | 494 | if (!address_allocate(context, &mess->yiaddr, mess->chaddr, mess->hlen, tagif_netid, now)) |
e17fb629 SK |
495 | message = _("no address available"); |
496 | } | |
497 | else | |
3d8df260 | 498 | mess->yiaddr = lease->addr; |
3d8df260 SK |
499 | } |
500 | ||
9009d746 SK |
501 | if (!message && !(context = narrow_context(context, mess->yiaddr, netid))) |
502 | message = _("wrong network"); | |
503 | else if (context->netid.net) | |
504 | { | |
505 | context->netid.next = netid; | |
8ef5ada2 SK |
506 | netid = &context->netid; |
507 | tagif_netid = run_tag_if(netid); | |
508 | } | |
509 | ||
9009d746 SK |
510 | if (!message && !nailed) |
511 | { | |
512 | for (id_list = daemon->bootp_dynamic; id_list; id_list = id_list->next) | |
8ef5ada2 | 513 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) |
9009d746 SK |
514 | break; |
515 | if (!id_list) | |
516 | message = _("no address configured"); | |
517 | } | |
518 | ||
7cebd20f SK |
519 | if (!message && |
520 | !lease && | |
521 | (!(lease = lease_allocate(mess->yiaddr)))) | |
824af85b | 522 | message = _("no leases left"); |
9009d746 | 523 | |
3d8df260 SK |
524 | if (!message) |
525 | { | |
526 | logaddr = &mess->yiaddr; | |
3d8df260 | 527 | |
cdeda28f | 528 | lease_set_hwaddr(lease, mess->chaddr, NULL, mess->hlen, mess->htype, 0); |
3d8df260 | 529 | if (hostname) |
9009d746 | 530 | lease_set_hostname(lease, hostname, 1); |
1a6bca81 SK |
531 | /* infinite lease unless nailed in dhcp-host line. */ |
532 | lease_set_expires(lease, | |
533 | have_config(config, CONFIG_TIME) ? config->lease_time : 0xffffffff, | |
534 | now); | |
824af85b | 535 | lease_set_interface(lease, int_index); |
3d8df260 | 536 | |
7622fc06 | 537 | clear_packet(mess, end); |
9009d746 | 538 | do_options(context, mess, end, NULL, hostname, get_domain(mess->yiaddr), |
8ef5ada2 | 539 | domain, tagif_netid, subnet_addr, 0, 0, 0, NULL, 0); |
3d8df260 SK |
540 | } |
541 | } | |
542 | ||
7622fc06 | 543 | log_packet("BOOTP", logaddr, mess->chaddr, mess->hlen, iface_name, message, mess->xid); |
1b7ecd11 | 544 | |
8ef5ada2 | 545 | return message ? 0 : dhcp_packet_size(mess, tagif_netid, agent_id, real_end); |
3be34541 | 546 | } |
1b7ecd11 | 547 | |
3d8df260 | 548 | if ((opt = option_find(mess, sz, OPTION_CLIENT_FQDN, 4))) |
9e4abcb5 | 549 | { |
3d8df260 | 550 | /* http://tools.ietf.org/wg/dhc/draft-ietf-dhc-fqdn-option/draft-ietf-dhc-fqdn-option-10.txt */ |
f6b7dc47 | 551 | int len = option_len(opt); |
3d8df260 | 552 | char *pq = daemon->dhcp_buff; |
1a6bca81 | 553 | unsigned char *pp, *op = option_ptr(opt, 0); |
3d8df260 SK |
554 | |
555 | fqdn_flags = *op; | |
556 | len -= 3; | |
557 | op += 3; | |
558 | pp = op; | |
559 | ||
560 | /* Always force update, since the client has no way to do it itself. */ | |
cdeda28f | 561 | if (!(fqdn_flags & 0x01)) |
3d8df260 SK |
562 | fqdn_flags |= 0x02; |
563 | ||
564 | fqdn_flags &= ~0x08; | |
565 | fqdn_flags |= 0x01; | |
566 | ||
567 | if (fqdn_flags & 0x04) | |
568 | while (*op != 0 && ((op + (*op) + 1) - pp) < len) | |
569 | { | |
570 | memcpy(pq, op+1, *op); | |
571 | pq += *op; | |
572 | op += (*op)+1; | |
573 | *(pq++) = '.'; | |
574 | } | |
575 | else | |
9e4abcb5 | 576 | { |
3d8df260 | 577 | memcpy(pq, op, len); |
cdeda28f SK |
578 | if (len > 0 && op[len-1] == 0) |
579 | borken_opt = 1; | |
3d8df260 | 580 | pq += len + 1; |
9e4abcb5 | 581 | } |
3d8df260 SK |
582 | |
583 | if (pq != daemon->dhcp_buff) | |
584 | pq--; | |
585 | ||
586 | *pq = 0; | |
587 | ||
1f15b81d | 588 | if (legal_hostname(daemon->dhcp_buff)) |
3d8df260 SK |
589 | offer_hostname = client_hostname = daemon->dhcp_buff; |
590 | } | |
591 | else if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1))) | |
592 | { | |
593 | int len = option_len(opt); | |
1a6bca81 | 594 | memcpy(daemon->dhcp_buff, option_ptr(opt, 0), len); |
cdeda28f SK |
595 | /* Microsoft clients are broken, and need zero-terminated strings |
596 | in options. We detect this state here, and do the same in | |
597 | any options we send */ | |
598 | if (len > 0 && daemon->dhcp_buff[len-1] == 0) | |
599 | borken_opt = 1; | |
600 | else | |
601 | daemon->dhcp_buff[len] = 0; | |
1f15b81d | 602 | if (legal_hostname(daemon->dhcp_buff)) |
3d8df260 SK |
603 | client_hostname = daemon->dhcp_buff; |
604 | } | |
605 | ||
28866e95 | 606 | if (client_hostname && option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
607 | my_syslog(MS_DHCP | LOG_INFO, _("%u client provides name: %s"), ntohl(mess->xid), client_hostname); |
608 | ||
3d8df260 SK |
609 | if (have_config(config, CONFIG_NAME)) |
610 | { | |
611 | hostname = config->hostname; | |
9009d746 | 612 | domain = config->domain; |
b8187c80 | 613 | hostname_auth = 1; |
832af0ba | 614 | /* be careful not to send an OFFER with a hostname not matching the DISCOVER. */ |
3d8df260 | 615 | if (fqdn_flags != 0 || !client_hostname || hostname_isequal(hostname, client_hostname)) |
832af0ba | 616 | offer_hostname = hostname; |
3d8df260 | 617 | } |
5aabfc78 | 618 | else if (client_hostname) |
3d8df260 | 619 | { |
9009d746 | 620 | domain = strip_hostname(client_hostname); |
5aabfc78 SK |
621 | |
622 | if (strlen(client_hostname) != 0) | |
623 | { | |
624 | hostname = client_hostname; | |
625 | if (!config) | |
626 | { | |
627 | /* Search again now we have a hostname. | |
628 | Only accept configs without CLID and HWADDR here, (they won't match) | |
629 | to avoid impersonation by name. */ | |
630 | struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0, | |
631 | mess->chaddr, mess->hlen, | |
632 | mess->htype, hostname); | |
9009d746 | 633 | if (new && !have_config(new, CONFIG_CLID) && !new->hwaddr) |
824af85b SK |
634 | { |
635 | config = new; | |
636 | /* set "known" tag for known hosts */ | |
637 | known_id.net = "known"; | |
638 | known_id.next = netid; | |
639 | netid = &known_id; | |
640 | } | |
5aabfc78 SK |
641 | } |
642 | } | |
9e4abcb5 | 643 | } |
a84fa1d0 | 644 | |
8ef5ada2 | 645 | if (config) |
a84fa1d0 | 646 | { |
8ef5ada2 SK |
647 | struct dhcp_netid_list *list; |
648 | ||
649 | for (list = config->netid; list; list = list->next) | |
650 | { | |
651 | list->list->next = netid; | |
652 | netid = list->list; | |
653 | } | |
a84fa1d0 | 654 | } |
36717eee | 655 | |
73a08a24 SK |
656 | /* dhcp-match. If we have hex-and-wildcards, look for a left-anchored match. |
657 | Otherwise assume the option is an array, and look for a matching element. | |
316e2730 SK |
658 | If no data given, existance of the option is enough. This code handles |
659 | rfc3925 V-I classes too. */ | |
73a08a24 SK |
660 | for (o = daemon->dhcp_match; o; o = o->next) |
661 | { | |
316e2730 SK |
662 | unsigned int len, elen, match = 0; |
663 | size_t offset, o2; | |
664 | ||
665 | if (o->flags & DHOPT_RFC3925) | |
666 | { | |
667 | if (!(opt = option_find(mess, sz, OPTION_VENDOR_IDENT, 5))) | |
668 | continue; | |
669 | ||
670 | for (offset = 0; offset < (option_len(opt) - 5u); offset += len + 5) | |
671 | { | |
672 | len = option_uint(opt, offset + 4 , 1); | |
673 | /* Need to take care that bad data can't run us off the end of the packet */ | |
674 | if ((offset + len + 5 <= (option_len(opt))) && | |
675 | (option_uint(opt, offset, 4) == (unsigned int)o->u.encap)) | |
676 | for (o2 = offset + 5; o2 < offset + len + 5; o2 += elen + 1) | |
677 | { | |
678 | elen = option_uint(opt, o2, 1); | |
679 | if ((o2 + elen + 1 <= option_len(opt)) && | |
680 | (match = match_bytes(o, option_ptr(opt, o2 + 1), elen))) | |
681 | break; | |
682 | } | |
683 | if (match) | |
73a08a24 | 684 | break; |
316e2730 SK |
685 | } |
686 | } | |
687 | else | |
688 | { | |
689 | if (!(opt = option_find(mess, sz, o->opt, 1))) | |
690 | continue; | |
691 | ||
692 | match = match_bytes(o, option_ptr(opt, 0), option_len(opt)); | |
693 | } | |
73a08a24 | 694 | |
316e2730 | 695 | if (match) |
73a08a24 SK |
696 | { |
697 | o->netid->next = netid; | |
698 | netid = o->netid; | |
699 | } | |
700 | } | |
701 | ||
26128d27 SK |
702 | /* user-class options are, according to RFC3004, supposed to contain |
703 | a set of counted strings. Here we check that this is so (by seeing | |
704 | if the counts are consistent with the overall option length) and if | |
705 | so zero the counts so that we don't get spurious matches between | |
706 | the vendor string and the counts. If the lengths don't add up, we | |
707 | assume that the option is a single string and non RFC3004 compliant | |
1697269c SK |
708 | and just do the substring match. dhclient provides these broken options. |
709 | The code, later, which sends user-class data to the lease-change script | |
710 | relies on the transformation done here. | |
711 | */ | |
a222641c | 712 | |
bb01cb96 | 713 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) |
a222641c | 714 | { |
1a6bca81 | 715 | unsigned char *ucp = option_ptr(opt, 0); |
f6b7dc47 | 716 | int tmp, j; |
26128d27 SK |
717 | for (j = 0; j < option_len(opt); j += ucp[j] + 1); |
718 | if (j == option_len(opt)) | |
719 | for (j = 0; j < option_len(opt); j = tmp) | |
720 | { | |
721 | tmp = j + ucp[j] + 1; | |
722 | ucp[j] = 0; | |
723 | } | |
724 | } | |
73a08a24 | 725 | |
26128d27 | 726 | for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next) |
f2621c7f SK |
727 | { |
728 | int mopt; | |
729 | ||
730 | if (vendor->match_type == MATCH_VENDOR) | |
731 | mopt = OPTION_VENDOR_ID; | |
732 | else if (vendor->match_type == MATCH_USER) | |
733 | mopt = OPTION_USER_CLASS; | |
734 | else | |
735 | continue; | |
736 | ||
737 | if ((opt = option_find(mess, sz, mopt, 1))) | |
738 | { | |
739 | int i; | |
740 | for (i = 0; i <= (option_len(opt) - vendor->len); i++) | |
1a6bca81 | 741 | if (memcmp(vendor->data, option_ptr(opt, i), vendor->len) == 0) |
f2621c7f SK |
742 | { |
743 | vendor->netid.next = netid; | |
744 | netid = &vendor->netid; | |
745 | break; | |
746 | } | |
747 | } | |
748 | } | |
749 | ||
8ef5ada2 SK |
750 | /* mark vendor-encapsulated options which match the client-supplied vendor class, |
751 | save client-supplied vendor class */ | |
752 | if ((opt = option_find(mess, sz, OPTION_VENDOR_ID, 1))) | |
753 | { | |
754 | memcpy(daemon->dhcp_buff3, option_ptr(opt, 0), option_len(opt)); | |
755 | vendor_class_len = option_len(opt); | |
756 | } | |
757 | match_vendor_opts(opt, daemon->dhcp_opts); | |
758 | ||
28866e95 | 759 | if (option_bool(OPT_LOG_OPTS)) |
f2621c7f | 760 | { |
8ef5ada2 SK |
761 | if (sanitise(opt, daemon->namebuff)) |
762 | my_syslog(MS_DHCP | LOG_INFO, _("%u vendor class: %s"), ntohl(mess->xid), daemon->namebuff); | |
f2621c7f | 763 | if (sanitise(option_find(mess, sz, OPTION_USER_CLASS, 1), daemon->namebuff)) |
8ef5ada2 | 764 | my_syslog(MS_DHCP | LOG_INFO, _("%u user class: %s"), ntohl(mess->xid), daemon->namebuff); |
f2621c7f SK |
765 | } |
766 | ||
8ef5ada2 SK |
767 | tagif_netid = run_tag_if(netid); |
768 | ||
26128d27 SK |
769 | /* if all the netids in the ignore list are present, ignore this client */ |
770 | for (id_list = daemon->dhcp_ignore; id_list; id_list = id_list->next) | |
8ef5ada2 | 771 | if (match_netid(id_list->list, tagif_netid, 0)) |
26128d27 | 772 | ignore = 1; |
8ef5ada2 SK |
773 | |
774 | /* If configured, we can override the server-id to be the address of the relay, | |
775 | so that all traffic goes via the relay and can pick up agent-id info. This can be | |
776 | configured for all relays, or by address. */ | |
777 | if (daemon->override && mess->giaddr.s_addr != 0 && override.s_addr == 0) | |
778 | { | |
779 | if (!daemon->override_relays) | |
780 | override = mess->giaddr; | |
781 | else | |
782 | { | |
783 | struct addr_list *l; | |
784 | for (l = daemon->override_relays; l; l = l->next) | |
785 | if (l->addr.s_addr == mess->giaddr.s_addr) | |
786 | break; | |
787 | if (l) | |
788 | override = mess->giaddr; | |
789 | } | |
790 | } | |
791 | ||
a84fa1d0 SK |
792 | /* Can have setting to ignore the client ID for a particular MAC address or hostname */ |
793 | if (have_config(config, CONFIG_NOCLID)) | |
0a852541 SK |
794 | clid = NULL; |
795 | ||
7622fc06 | 796 | /* Check if client is PXE client. */ |
1f15b81d SK |
797 | if (daemon->enable_pxe && |
798 | (opt = option_find(mess, sz, OPTION_VENDOR_ID, 9)) && | |
7622fc06 SK |
799 | strncmp(option_ptr(opt, 0), "PXEClient", 9) == 0) |
800 | { | |
801 | if ((opt = option_find(mess, sz, OPTION_PXE_UUID, 17))) | |
802 | { | |
803 | memcpy(pxe_uuid, option_ptr(opt, 0), 17); | |
804 | uuid = pxe_uuid; | |
805 | } | |
806 | ||
807 | /* Check if this is really a PXE bootserver request, and handle specially if so. */ | |
808 | if ((mess_type == DHCPREQUEST || mess_type == DHCPINFORM) && | |
809 | (opt = option_find(mess, sz, OPTION_VENDOR_CLASS_OPT, 1)) && | |
810 | (opt = option_find1(option_ptr(opt, 0), option_ptr(opt, option_len(opt)), SUBOPT_PXE_BOOT_ITEM, 4))) | |
811 | { | |
812 | struct pxe_service *service; | |
813 | int type = option_uint(opt, 0, 2); | |
814 | int layer = option_uint(opt, 2, 2); | |
815 | unsigned char save71[4]; | |
816 | struct dhcp_opt opt71; | |
817 | ||
1f15b81d SK |
818 | if (ignore) |
819 | return 0; | |
820 | ||
7622fc06 SK |
821 | if (layer & 0x8000) |
822 | { | |
823 | my_syslog(MS_DHCP | LOG_ERR, _("PXE BIS not supported")); | |
824 | return 0; | |
825 | } | |
826 | ||
827 | memcpy(save71, option_ptr(opt, 0), 4); | |
828 | ||
829 | for (service = daemon->pxe_services; service; service = service->next) | |
830 | if (service->type == type) | |
831 | break; | |
832 | ||
833 | if (!service || !service->basename) | |
834 | return 0; | |
835 | ||
836 | clear_packet(mess, end); | |
837 | ||
838 | mess->yiaddr = mess->ciaddr; | |
839 | mess->ciaddr.s_addr = 0; | |
840 | if (service->server.s_addr != 0) | |
841 | mess->siaddr = service->server; | |
842 | else | |
843 | mess->siaddr = context->local; | |
844 | ||
845 | snprintf((char *)mess->file, sizeof(mess->file), "%s.%d", service->basename, layer); | |
846 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); | |
847 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); | |
848 | pxe_misc(mess, end, uuid); | |
849 | ||
8ef5ada2 | 850 | prune_vendor_opts(tagif_netid); |
7622fc06 SK |
851 | opt71.val = save71; |
852 | opt71.opt = SUBOPT_PXE_BOOT_ITEM; | |
853 | opt71.len = 4; | |
854 | opt71.flags = DHOPT_VENDOR_MATCH; | |
855 | opt71.netid = NULL; | |
856 | opt71.next = daemon->dhcp_opts; | |
857 | do_encap_opts(&opt71, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); | |
858 | ||
859 | log_packet("PXE", &mess->yiaddr, emac, emac_len, iface_name, (char *)mess->file, mess->xid); | |
8ef5ada2 | 860 | return dhcp_packet_size(mess, tagif_netid, agent_id, real_end); |
7622fc06 SK |
861 | } |
862 | ||
863 | if ((opt = option_find(mess, sz, OPTION_ARCH, 2))) | |
864 | { | |
865 | pxearch = option_uint(opt, 0, 2); | |
866 | ||
316e2730 | 867 | /* proxy DHCP here. */ |
28866e95 | 868 | if ((mess_type == DHCPDISCOVER || (pxe && mess_type == DHCPREQUEST))) |
7622fc06 | 869 | { |
28866e95 | 870 | struct dhcp_context *tmp; |
7622fc06 | 871 | |
28866e95 SK |
872 | for (tmp = context; tmp; tmp = tmp->current) |
873 | if ((tmp->flags & CONTEXT_PROXY) && | |
874 | match_netid(tmp->filter, tagif_netid, 1)) | |
875 | break; | |
876 | ||
877 | if (tmp) | |
7622fc06 | 878 | { |
28866e95 SK |
879 | struct dhcp_boot *boot = find_boot(tagif_netid); |
880 | ||
881 | mess->yiaddr.s_addr = 0; | |
882 | if (mess_type == DHCPDISCOVER || mess->ciaddr.s_addr == 0) | |
883 | { | |
884 | mess->ciaddr.s_addr = 0; | |
885 | mess->flags |= htons(0x8000); /* broadcast */ | |
886 | } | |
887 | ||
888 | clear_packet(mess, end); | |
889 | ||
890 | /* Provide the bootfile here, for gPXE, and in case we have no menu items | |
891 | and set discovery_control = 8 */ | |
892 | if (boot) | |
893 | { | |
894 | if (boot->next_server.s_addr) | |
895 | mess->siaddr = boot->next_server; | |
896 | ||
897 | if (boot->file) | |
898 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); | |
899 | } | |
7622fc06 | 900 | |
28866e95 SK |
901 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, |
902 | mess_type == DHCPDISCOVER ? DHCPOFFER : DHCPACK); | |
903 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, htonl(context->local.s_addr)); | |
904 | pxe_misc(mess, end, uuid); | |
905 | prune_vendor_opts(tagif_netid); | |
906 | do_encap_opts(pxe_opts(pxearch, tagif_netid, context->local), OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, 0); | |
907 | ||
908 | log_packet("PXE", NULL, emac, emac_len, iface_name, ignore ? "proxy-ignored" : "proxy", mess->xid); | |
909 | return ignore ? 0 : dhcp_packet_size(mess, tagif_netid, agent_id, real_end); | |
7622fc06 | 910 | } |
7622fc06 SK |
911 | } |
912 | } | |
913 | } | |
914 | ||
915 | /* if we're just a proxy server, go no further */ | |
316e2730 | 916 | if ((context->flags & CONTEXT_PROXY) || pxe) |
7622fc06 SK |
917 | return 0; |
918 | ||
bb01cb96 | 919 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0))) |
a84fa1d0 | 920 | { |
3d8df260 | 921 | req_options = (unsigned char *)daemon->dhcp_buff2; |
1a6bca81 | 922 | memcpy(req_options, option_ptr(opt, 0), option_len(opt)); |
bb01cb96 | 923 | req_options[option_len(opt)] = OPTION_END; |
a84fa1d0 SK |
924 | } |
925 | ||
3be34541 | 926 | switch (mess_type) |
9e4abcb5 | 927 | { |
44a2a316 | 928 | case DHCPDECLINE: |
bb01cb96 | 929 | if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
73a08a24 | 930 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
44a2a316 | 931 | return 0; |
1a6bca81 | 932 | |
44a2a316 | 933 | /* sanitise any message. Paranoid? Moi? */ |
f2621c7f | 934 | sanitise(option_find(mess, sz, OPTION_MESSAGE, 1), daemon->dhcp_buff); |
44a2a316 | 935 | |
bb01cb96 | 936 | if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
44a2a316 SK |
937 | return 0; |
938 | ||
7622fc06 | 939 | log_packet("DHCPDECLINE", option_ptr(opt, 0), emac, emac_len, iface_name, daemon->dhcp_buff, mess->xid); |
44a2a316 SK |
940 | |
941 | if (lease && lease->addr.s_addr == option_addr(opt).s_addr) | |
942 | lease_prune(lease, now); | |
943 | ||
33820b7e | 944 | if (have_config(config, CONFIG_ADDR) && |
44a2a316 | 945 | config->addr.s_addr == option_addr(opt).s_addr) |
9e4abcb5 | 946 | { |
849a8357 | 947 | prettyprint_time(daemon->dhcp_buff, DECLINE_BACKOFF); |
7622fc06 | 948 | my_syslog(MS_DHCP | LOG_WARNING, _("disabling DHCP static address %s for %s"), |
f2621c7f | 949 | inet_ntoa(config->addr), daemon->dhcp_buff); |
849a8357 SK |
950 | config->flags |= CONFIG_DECLINED; |
951 | config->decline_time = now; | |
9e4abcb5 | 952 | } |
feba5c1d SK |
953 | else |
954 | /* make sure this host gets a different address next time. */ | |
36717eee SK |
955 | for (; context; context = context->current) |
956 | context->addr_epoch++; | |
44a2a316 SK |
957 | |
958 | return 0; | |
959 | ||
960 | case DHCPRELEASE: | |
8ef5ada2 | 961 | if (!(context = narrow_context(context, mess->ciaddr, tagif_netid)) || |
1697269c | 962 | !(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) || |
73a08a24 | 963 | option_addr(opt).s_addr != server_id(context, override, fallback).s_addr) |
44a2a316 SK |
964 | return 0; |
965 | ||
44a2a316 SK |
966 | if (lease && lease->addr.s_addr == mess->ciaddr.s_addr) |
967 | lease_prune(lease, now); | |
fd9fa481 | 968 | else |
b8187c80 | 969 | message = _("unknown lease"); |
fd9fa481 | 970 | |
7622fc06 | 971 | log_packet("DHCPRELEASE", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
44a2a316 | 972 | |
9e4abcb5 SK |
973 | return 0; |
974 | ||
975 | case DHCPDISCOVER: | |
5e9e0efb SK |
976 | if (ignore || have_config(config, CONFIG_DISABLE)) |
977 | { | |
b8187c80 | 978 | message = _("ignored"); |
5e9e0efb SK |
979 | opt = NULL; |
980 | } | |
981 | else | |
982 | { | |
983 | struct in_addr addr, conf; | |
984 | ||
1a6bca81 SK |
985 | addr.s_addr = conf.s_addr = 0; |
986 | ||
5e9e0efb SK |
987 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
988 | addr = option_addr(opt); | |
989 | ||
5e9e0efb SK |
990 | if (have_config(config, CONFIG_ADDR)) |
991 | { | |
849a8357 SK |
992 | char *addrs = inet_ntoa(config->addr); |
993 | ||
9009d746 SK |
994 | if ((ltmp = lease_find_by_addr(config->addr)) && |
995 | ltmp != lease && | |
996 | !config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) | |
1b7ecd11 SK |
997 | { |
998 | int len; | |
999 | unsigned char *mac = extended_hwaddr(ltmp->hwaddr_type, ltmp->hwaddr_len, | |
1000 | ltmp->hwaddr, ltmp->clid_len, ltmp->clid, &len); | |
7622fc06 | 1001 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is leased to %s"), |
5aabfc78 | 1002 | addrs, print_mac(daemon->namebuff, mac, len)); |
1b7ecd11 | 1003 | } |
5e9e0efb SK |
1004 | else |
1005 | { | |
1006 | struct dhcp_context *tmp; | |
1007 | for (tmp = context; tmp; tmp = tmp->current) | |
849a8357 | 1008 | if (context->router.s_addr == config->addr.s_addr) |
5e9e0efb SK |
1009 | break; |
1010 | if (tmp) | |
7622fc06 | 1011 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it is in use by the server or relay"), addrs); |
849a8357 SK |
1012 | else if (have_config(config, CONFIG_DECLINED) && |
1013 | difftime(now, config->decline_time) < (float)DECLINE_BACKOFF) | |
7622fc06 | 1014 | my_syslog(MS_DHCP | LOG_WARNING, _("not using configured address %s because it was previously declined"), addrs); |
5e9e0efb SK |
1015 | else |
1016 | conf = config->addr; | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | if (conf.s_addr) | |
1021 | mess->yiaddr = conf; | |
7622fc06 | 1022 | else if (lease && |
8ef5ada2 | 1023 | address_available(context, lease->addr, tagif_netid) && |
7622fc06 | 1024 | !config_find_by_address(daemon->dhcp_conf, lease->addr)) |
5e9e0efb | 1025 | mess->yiaddr = lease->addr; |
8ef5ada2 | 1026 | else if (opt && address_available(context, addr, tagif_netid) && !lease_find_by_addr(addr) && |
5e9e0efb SK |
1027 | !config_find_by_address(daemon->dhcp_conf, addr)) |
1028 | mess->yiaddr = addr; | |
5aabfc78 SK |
1029 | else if (emac_len == 0) |
1030 | message = _("no unique-id"); | |
8ef5ada2 | 1031 | else if (!address_allocate(context, &mess->yiaddr, emac, emac_len, tagif_netid, now)) |
5e9e0efb SK |
1032 | message = _("no address available"); |
1033 | } | |
1034 | ||
7622fc06 | 1035 | log_packet("DHCPDISCOVER", opt ? option_ptr(opt, 0) : NULL, emac, emac_len, iface_name, message, mess->xid); |
3d8df260 | 1036 | |
8ef5ada2 | 1037 | if (message || !(context = narrow_context(context, mess->yiaddr, tagif_netid))) |
33820b7e | 1038 | return 0; |
e17fb629 | 1039 | |
7622fc06 | 1040 | log_packet("DHCPOFFER" , &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); |
1b7ecd11 | 1041 | |
cdeda28f | 1042 | if (context->netid.net) |
59353a6b SK |
1043 | { |
1044 | context->netid.next = netid; | |
1045 | netid = &context->netid; | |
8ef5ada2 | 1046 | tagif_netid = run_tag_if(netid); |
59353a6b SK |
1047 | } |
1048 | ||
824af85b | 1049 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
7622fc06 | 1050 | clear_packet(mess, end); |
1b7ecd11 | 1051 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPOFFER); |
73a08a24 | 1052 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1053 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
a84fa1d0 | 1054 | /* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */ |
59353a6b | 1055 | if (time != 0xffffffff) |
a84fa1d0 | 1056 | { |
1b7ecd11 SK |
1057 | option_put(mess, end, OPTION_T1, 4, (time/2)); |
1058 | option_put(mess, end, OPTION_T2, 4, (time*7)/8); | |
a84fa1d0 | 1059 | } |
9009d746 | 1060 | do_options(context, mess, end, req_options, offer_hostname, get_domain(mess->yiaddr), |
8ef5ada2 | 1061 | domain, tagif_netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len); |
9e4abcb5 | 1062 | |
8ef5ada2 | 1063 | return dhcp_packet_size(mess, tagif_netid, agent_id, real_end); |
9e4abcb5 SK |
1064 | |
1065 | case DHCPREQUEST: | |
26128d27 SK |
1066 | if (ignore || have_config(config, CONFIG_DISABLE)) |
1067 | return 0; | |
bb01cb96 | 1068 | if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ))) |
9e4abcb5 SK |
1069 | { |
1070 | /* SELECTING or INIT_REBOOT */ | |
44a2a316 | 1071 | mess->yiaddr = option_addr(opt); |
9e4abcb5 | 1072 | |
4011c4e0 SK |
1073 | /* send vendor and user class info for new or recreated lease */ |
1074 | do_classes = 1; | |
1075 | ||
bb01cb96 | 1076 | if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ))) |
3be34541 SK |
1077 | { |
1078 | /* SELECTING */ | |
832af0ba SK |
1079 | selecting = 1; |
1080 | ||
1a6bca81 SK |
1081 | if (override.s_addr != 0) |
1082 | { | |
1083 | if (option_addr(opt).s_addr != override.s_addr) | |
1084 | return 0; | |
1085 | } | |
9009d746 | 1086 | else |
1a6bca81 SK |
1087 | { |
1088 | for (; context; context = context->current) | |
1089 | if (context->local.s_addr == option_addr(opt).s_addr) | |
1090 | break; | |
1091 | ||
1092 | if (!context) | |
9009d746 SK |
1093 | { |
1094 | /* In auth mode, a REQUEST sent to the wrong server | |
1095 | should be faulted, so that the client establishes | |
1096 | communication with us, otherwise, silently ignore. */ | |
28866e95 | 1097 | if (!option_bool(OPT_AUTHORITATIVE)) |
9009d746 SK |
1098 | return 0; |
1099 | message = _("wrong server-ID"); | |
1100 | } | |
1a6bca81 | 1101 | } |
e17fb629 | 1102 | |
3be34541 SK |
1103 | /* If a lease exists for this host and another address, squash it. */ |
1104 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) | |
1105 | { | |
1106 | lease_prune(lease, now); | |
1107 | lease = NULL; | |
1108 | } | |
3be34541 SK |
1109 | } |
1110 | else | |
9e4abcb5 | 1111 | { |
3be34541 | 1112 | /* INIT-REBOOT */ |
28866e95 | 1113 | if (!lease && !option_bool(OPT_AUTHORITATIVE)) |
3be34541 SK |
1114 | return 0; |
1115 | ||
fd9fa481 | 1116 | if (lease && lease->addr.s_addr != mess->yiaddr.s_addr) |
8ef5ada2 | 1117 | message = _("wrong address"); |
9e4abcb5 | 1118 | } |
44a2a316 SK |
1119 | } |
1120 | else | |
1121 | { | |
1122 | /* RENEWING or REBINDING */ | |
cdeda28f SK |
1123 | /* Check existing lease for this address. |
1124 | We allow it to be missing if dhcp-authoritative mode | |
1125 | as long as we can allocate the lease now - checked below. | |
1126 | This makes for a smooth recovery from a lost lease DB */ | |
1127 | if ((lease && mess->ciaddr.s_addr != lease->addr.s_addr) || | |
28866e95 | 1128 | (!lease && !option_bool(OPT_AUTHORITATIVE))) |
b8187c80 | 1129 | { |
28866e95 SK |
1130 | /* A client rebinding will broadcast the request, so we may see it even |
1131 | if the lease is held by another server. Just ignore it in that case. | |
1132 | If the request is unicast to us, then somethings wrong, NAK */ | |
1133 | if (!unicast_dest) | |
1134 | return 0; | |
b8187c80 SK |
1135 | message = _("lease not found"); |
1136 | /* ensure we broadcast NAK */ | |
1137 | unicast_dest = 0; | |
1138 | } | |
8ef5ada2 | 1139 | |
a84fa1d0 SK |
1140 | /* desynchronise renewals */ |
1141 | fuzz = rand16(); | |
3be34541 | 1142 | mess->yiaddr = mess->ciaddr; |
44a2a316 SK |
1143 | } |
1144 | ||
7622fc06 | 1145 | log_packet("DHCPREQUEST", &mess->yiaddr, emac, emac_len, iface_name, NULL, mess->xid); |
e17fb629 | 1146 | |
dfa666f2 SK |
1147 | if (!message) |
1148 | { | |
1149 | struct dhcp_config *addr_config; | |
5e9e0efb SK |
1150 | struct dhcp_context *tmp = NULL; |
1151 | ||
1152 | if (have_config(config, CONFIG_ADDR)) | |
1153 | for (tmp = context; tmp; tmp = tmp->current) | |
849a8357 | 1154 | if (context->router.s_addr == config->addr.s_addr) |
5e9e0efb | 1155 | break; |
aedef830 | 1156 | |
8ef5ada2 | 1157 | if (!(context = narrow_context(context, mess->yiaddr, tagif_netid))) |
b8187c80 | 1158 | { |
e17fb629 | 1159 | /* If a machine moves networks whilst it has a lease, we catch that here. */ |
b8187c80 SK |
1160 | message = _("wrong network"); |
1161 | /* ensure we broadcast NAK */ | |
1162 | unicast_dest = 0; | |
1163 | } | |
1164 | ||
fd9fa481 | 1165 | /* Check for renewal of a lease which is outside the allowed range. */ |
8ef5ada2 | 1166 | else if (!address_available(context, mess->yiaddr, tagif_netid) && |
dfa666f2 | 1167 | (!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr)) |
b8187c80 | 1168 | message = _("address not available"); |
e17fb629 | 1169 | |
dfa666f2 SK |
1170 | /* Check if a new static address has been configured. Be very sure that |
1171 | when the client does DISCOVER, it will get the static address, otherwise | |
1172 | an endless protocol loop will ensue. */ | |
832af0ba | 1173 | else if (!tmp && !selecting && |
5e9e0efb | 1174 | have_config(config, CONFIG_ADDR) && |
849a8357 SK |
1175 | (!have_config(config, CONFIG_DECLINED) || |
1176 | difftime(now, config->decline_time) > (float)DECLINE_BACKOFF) && | |
fd9fa481 SK |
1177 | config->addr.s_addr != mess->yiaddr.s_addr && |
1178 | (!(ltmp = lease_find_by_addr(config->addr)) || ltmp == lease)) | |
b8187c80 | 1179 | message = _("static lease available"); |
dfa666f2 SK |
1180 | |
1181 | /* Check to see if the address is reserved as a static address for another host */ | |
3be34541 | 1182 | else if ((addr_config = config_find_by_address(daemon->dhcp_conf, mess->yiaddr)) && addr_config != config) |
b8187c80 | 1183 | message = _("address reserved"); |
feba5c1d | 1184 | |
9009d746 SK |
1185 | else if (!lease && (ltmp = lease_find_by_addr(mess->yiaddr))) |
1186 | { | |
1187 | /* If a host is configured with more than one MAC address, it's OK to 'nix | |
1188 | a lease from one of it's MACs to give the address to another. */ | |
1189 | if (config && config_has_mac(config, ltmp->hwaddr, ltmp->hwaddr_len, ltmp->hwaddr_type)) | |
1190 | { | |
7622fc06 | 1191 | my_syslog(MS_DHCP | LOG_INFO, _("abandoning lease to %s of %s"), |
9009d746 SK |
1192 | print_mac(daemon->namebuff, ltmp->hwaddr, ltmp->hwaddr_len), |
1193 | inet_ntoa(ltmp->addr)); | |
1194 | lease = ltmp; | |
1195 | } | |
1697269c | 1196 | else |
9009d746 SK |
1197 | message = _("address in use"); |
1198 | } | |
1199 | ||
1200 | if (!message) | |
1201 | { | |
1202 | if (emac_len == 0) | |
1203 | message = _("no unique-id"); | |
1204 | ||
1205 | else if (!lease) | |
1206 | { | |
1207 | if ((lease = lease_allocate(mess->yiaddr))) | |
1208 | do_classes = 1; | |
1209 | else | |
1210 | message = _("no leases left"); | |
1211 | } | |
1697269c | 1212 | } |
fd9fa481 | 1213 | } |
1697269c | 1214 | |
44a2a316 SK |
1215 | if (message) |
1216 | { | |
7622fc06 | 1217 | log_packet("DHCPNAK", &mess->yiaddr, emac, emac_len, iface_name, message, mess->xid); |
44a2a316 | 1218 | |
1b7ecd11 | 1219 | mess->yiaddr.s_addr = 0; |
7622fc06 | 1220 | clear_packet(mess, end); |
1b7ecd11 | 1221 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPNAK); |
73a08a24 | 1222 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1223 | option_put_string(mess, end, OPTION_MESSAGE, message, borken_opt); |
b8187c80 SK |
1224 | /* This fixes a problem with the DHCP spec, broadcasting a NAK to a host on |
1225 | a distant subnet which unicast a REQ to us won't work. */ | |
1226 | if (!unicast_dest || mess->giaddr.s_addr != 0 || | |
1227 | mess->ciaddr.s_addr == 0 || is_same_net(context->local, mess->ciaddr, context->netmask)) | |
1228 | { | |
1229 | mess->flags |= htons(0x8000); /* broadcast */ | |
1230 | mess->ciaddr.s_addr = 0; | |
1231 | } | |
44a2a316 | 1232 | } |
fd9fa481 | 1233 | else |
44a2a316 | 1234 | { |
316e2730 SK |
1235 | if (context->netid.net) |
1236 | { | |
1237 | context->netid.next = netid; | |
1238 | netid = &context->netid; | |
8ef5ada2 | 1239 | tagif_netid = run_tag_if(netid); |
316e2730 | 1240 | } |
8ef5ada2 | 1241 | |
316e2730 | 1242 | #ifdef HAVE_SCRIPT |
8ef5ada2 SK |
1243 | if (do_classes && daemon->lease_change_command) |
1244 | { | |
1245 | struct dhcp_netid *n; | |
1246 | ||
1247 | if (mess->giaddr.s_addr) | |
1248 | lease->giaddr = mess->giaddr; | |
1249 | ||
1250 | lease->changed = 1; | |
1251 | free(lease->extradata); | |
28866e95 | 1252 | lease->extradata = NULL; |
8ef5ada2 SK |
1253 | lease->extradata_size = lease->extradata_len = 0; |
1254 | ||
1255 | add_extradata_opt(lease, option_find(mess, sz, OPTION_VENDOR_ID, 1)); | |
1256 | add_extradata_opt(lease, option_find(mess, sz, OPTION_HOSTNAME, 1)); | |
1257 | add_extradata_opt(lease, oui); | |
1258 | add_extradata_opt(lease, serial); | |
1259 | add_extradata_opt(lease, class); | |
1260 | ||
1261 | /* space-concat tag set */ | |
1262 | if (!tagif_netid) | |
1263 | add_extradata_opt(lease, NULL); | |
1264 | else | |
1265 | for (n = tagif_netid; n; n = n->next) | |
1266 | add_extradata_data(lease, (unsigned char *)n->net, strlen(n->net), n->next ? ' ' : 0); | |
1267 | ||
1268 | if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1))) | |
1269 | { | |
1270 | int len = option_len(opt); | |
1271 | unsigned char *ucp = option_ptr(opt, 0); | |
1272 | /* If the user-class option started as counted strings, the first byte will be zero. */ | |
1273 | if (len != 0 && ucp[0] == 0) | |
1274 | ucp++, len--; | |
1275 | add_extradata_data(lease, ucp, len, 0); | |
1276 | } | |
1277 | } | |
316e2730 | 1278 | #endif |
8ef5ada2 SK |
1279 | |
1280 | if (!hostname_auth && (client_hostname = host_from_dns(mess->yiaddr))) | |
1281 | { | |
1282 | domain = get_domain(mess->yiaddr); | |
b8187c80 SK |
1283 | hostname = client_hostname; |
1284 | hostname_auth = 1; | |
1285 | } | |
8ef5ada2 | 1286 | |
824af85b | 1287 | time = calc_time(context, config, option_find(mess, sz, OPTION_LEASE_TIME, 4)); |
cdeda28f | 1288 | lease_set_hwaddr(lease, mess->chaddr, clid, mess->hlen, mess->htype, clid_len); |
8ef5ada2 | 1289 | |
832af0ba SK |
1290 | /* if all the netids in the ignore_name list are present, ignore client-supplied name */ |
1291 | if (!hostname_auth) | |
1292 | { | |
1293 | for (id_list = daemon->dhcp_ignore_names; id_list; id_list = id_list->next) | |
8ef5ada2 | 1294 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) |
832af0ba SK |
1295 | break; |
1296 | if (id_list) | |
1297 | hostname = NULL; | |
1298 | } | |
8ef5ada2 SK |
1299 | |
1300 | /* Last ditch, if configured, generate hostname from mac address */ | |
1301 | if (!hostname && emac_len != 0) | |
1302 | { | |
1303 | for (id_list = daemon->dhcp_gen_names; id_list; id_list = id_list->next) | |
1304 | if ((!id_list->list) || match_netid(id_list->list, tagif_netid, 0)) | |
1305 | break; | |
1306 | if (id_list) | |
1307 | { | |
1308 | int i; | |
1309 | ||
1310 | hostname = daemon->dhcp_buff; | |
1311 | /* buffer is 256 bytes, 3 bytes per octet */ | |
1312 | for (i = 0; (i < emac_len) && (i < 80); i++) | |
1313 | hostname += sprintf(hostname, "%.2x%s", emac[i], (i == emac_len - 1) ? "" : "-"); | |
1314 | hostname = daemon->dhcp_buff; | |
1315 | } | |
1316 | } | |
1317 | ||
fd9fa481 | 1318 | if (hostname) |
9009d746 | 1319 | lease_set_hostname(lease, hostname, hostname_auth); |
832af0ba | 1320 | |
5e9e0efb | 1321 | lease_set_expires(lease, time, now); |
824af85b | 1322 | lease_set_interface(lease, int_index); |
1a6bca81 SK |
1323 | |
1324 | if (override.s_addr != 0) | |
1325 | lease->override = override; | |
1326 | else | |
1327 | override = lease->override; | |
1328 | ||
7622fc06 | 1329 | log_packet("DHCPACK", &mess->yiaddr, emac, emac_len, iface_name, hostname, mess->xid); |
832af0ba | 1330 | |
7622fc06 | 1331 | clear_packet(mess, end); |
1b7ecd11 | 1332 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
73a08a24 | 1333 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1b7ecd11 | 1334 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); |
59353a6b | 1335 | if (time != 0xffffffff) |
fd9fa481 | 1336 | { |
59353a6b SK |
1337 | while (fuzz > (time/16)) |
1338 | fuzz = fuzz/2; | |
1b7ecd11 SK |
1339 | option_put(mess, end, OPTION_T1, 4, (time/2) - fuzz); |
1340 | option_put(mess, end, OPTION_T2, 4, ((time/8)*7) - fuzz); | |
fd9fa481 | 1341 | } |
9009d746 | 1342 | do_options(context, mess, end, req_options, hostname, get_domain(mess->yiaddr), |
8ef5ada2 | 1343 | domain, tagif_netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len); |
44a2a316 | 1344 | } |
fd9fa481 | 1345 | |
8ef5ada2 | 1346 | return dhcp_packet_size(mess, tagif_netid, agent_id, real_end); |
9e4abcb5 SK |
1347 | |
1348 | case DHCPINFORM: | |
26128d27 | 1349 | if (ignore || have_config(config, CONFIG_DISABLE)) |
b8187c80 | 1350 | message = _("ignored"); |
33820b7e | 1351 | |
7622fc06 | 1352 | log_packet("DHCPINFORM", &mess->ciaddr, emac, emac_len, iface_name, message, mess->xid); |
a84fa1d0 | 1353 | |
73a08a24 | 1354 | if (message || mess->ciaddr.s_addr == 0) |
a84fa1d0 | 1355 | return 0; |
73a08a24 SK |
1356 | |
1357 | /* For DHCPINFORM only, cope without a valid context */ | |
8ef5ada2 | 1358 | context = narrow_context(context, mess->ciaddr, tagif_netid); |
9e4abcb5 | 1359 | |
5aabfc78 SK |
1360 | /* Find a least based on IP address if we didn't |
1361 | get one from MAC address/client-d */ | |
1362 | if (!lease && | |
1363 | (lease = lease_find_by_addr(mess->ciaddr)) && | |
1364 | lease->hostname) | |
1365 | hostname = lease->hostname; | |
1366 | ||
8ef5ada2 SK |
1367 | if (!hostname && (hostname = host_from_dns(mess->ciaddr))) |
1368 | domain = get_domain(mess->ciaddr); | |
1b7ecd11 | 1369 | |
7622fc06 | 1370 | log_packet("DHCPACK", &mess->ciaddr, emac, emac_len, iface_name, hostname, mess->xid); |
5aabfc78 | 1371 | |
73a08a24 | 1372 | if (context && context->netid.net) |
59353a6b SK |
1373 | { |
1374 | context->netid.next = netid; | |
1375 | netid = &context->netid; | |
8ef5ada2 | 1376 | tagif_netid = run_tag_if(netid); |
59353a6b | 1377 | } |
1a6bca81 | 1378 | |
3927da46 SK |
1379 | if (lease) |
1380 | { | |
1381 | if (override.s_addr != 0) | |
1382 | lease->override = override; | |
1383 | else | |
1384 | override = lease->override; | |
1385 | } | |
1386 | ||
7622fc06 | 1387 | clear_packet(mess, end); |
1b7ecd11 | 1388 | option_put(mess, end, OPTION_MESSAGE_TYPE, 1, DHCPACK); |
73a08a24 SK |
1389 | option_put(mess, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(server_id(context, override, fallback).s_addr)); |
1390 | ||
5aabfc78 SK |
1391 | if (lease) |
1392 | { | |
1393 | if (lease->expires == 0) | |
1394 | time = 0xffffffff; | |
1395 | else | |
1396 | time = (unsigned int)difftime(lease->expires, now); | |
1397 | option_put(mess, end, OPTION_LEASE_TIME, 4, time); | |
824af85b | 1398 | lease_set_interface(lease, int_index); |
5aabfc78 | 1399 | } |
824af85b | 1400 | |
9009d746 | 1401 | do_options(context, mess, end, req_options, hostname, get_domain(mess->ciaddr), |
8ef5ada2 | 1402 | domain, tagif_netid, subnet_addr, fqdn_flags, borken_opt, pxearch, uuid, vendor_class_len); |
9e4abcb5 | 1403 | |
5aabfc78 | 1404 | *is_inform = 1; /* handle reply differently */ |
8ef5ada2 | 1405 | return dhcp_packet_size(mess, tagif_netid, agent_id, real_end); |
9e4abcb5 SK |
1406 | } |
1407 | ||
1408 | return 0; | |
1409 | } | |
1410 | ||
316e2730 SK |
1411 | static int match_bytes(struct dhcp_opt *o, unsigned char *p, int len) |
1412 | { | |
1413 | int i; | |
1414 | ||
1415 | if (o->len > len) | |
1416 | return 0; | |
1417 | ||
1418 | if (o->len == 0) | |
1419 | return 1; | |
1420 | ||
1421 | if (o->flags & DHOPT_HEX) | |
1422 | { | |
1423 | if (memcmp_masked(o->val, p, o->len, o->u.wildcard_mask)) | |
1424 | return 1; | |
1425 | } | |
1426 | else | |
1427 | for (i = 0; i <= (len - o->len); ) | |
1428 | { | |
1429 | if (memcmp(o->val, p + i, o->len) == 0) | |
1430 | return 1; | |
1431 | ||
1432 | if (o->flags & DHOPT_STRING) | |
1433 | i++; | |
1434 | else | |
1435 | i += o->len; | |
1436 | } | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | ||
6b01084f SK |
1442 | /* find a good value to use as MAC address for logging and address-allocation hashing. |
1443 | This is normally just the chaddr field from the DHCP packet, | |
1444 | but eg Firewire will have hlen == 0 and use the client-id instead. | |
1445 | This could be anything, but will normally be EUI64 for Firewire. | |
1446 | We assume that if the first byte of the client-id equals the htype byte | |
1447 | then the client-id is using the usual encoding and use the rest of the | |
1448 | client-id: if not we can use the whole client-id. This should give | |
1449 | sane MAC address logs. */ | |
9009d746 | 1450 | unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, |
6b01084f SK |
1451 | int clid_len, unsigned char *clid, int *len_out) |
1452 | { | |
1453 | if (hwlen == 0 && clid && clid_len > 3) | |
1454 | { | |
1455 | if (clid[0] == hwtype) | |
1456 | { | |
1457 | *len_out = clid_len - 1 ; | |
1458 | return clid + 1; | |
1459 | } | |
1460 | ||
1461 | #if defined(ARPHRD_EUI64) && defined(ARPHRD_IEEE1394) | |
1462 | if (clid[0] == ARPHRD_EUI64 && hwtype == ARPHRD_IEEE1394) | |
1463 | { | |
1464 | *len_out = clid_len - 1 ; | |
1465 | return clid + 1; | |
1466 | } | |
1467 | #endif | |
1468 | ||
1469 | *len_out = clid_len; | |
1470 | return clid; | |
1471 | } | |
1472 | ||
1473 | *len_out = hwlen; | |
1474 | return hwaddr; | |
1475 | } | |
1476 | ||
824af85b | 1477 | static unsigned int calc_time(struct dhcp_context *context, struct dhcp_config *config, unsigned char *opt) |
9e4abcb5 | 1478 | { |
5e9e0efb SK |
1479 | unsigned int time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time; |
1480 | ||
1481 | if (opt) | |
1482 | { | |
7622fc06 | 1483 | unsigned int req_time = option_uint(opt, 0, 4); |
5e9e0efb SK |
1484 | if (req_time < 120 ) |
1485 | req_time = 120; /* sanity */ | |
1486 | if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time)) | |
1487 | time = req_time; | |
1488 | } | |
3d8df260 | 1489 | |
5e9e0efb SK |
1490 | return time; |
1491 | } | |
1492 | ||
73a08a24 | 1493 | static struct in_addr server_id(struct dhcp_context *context, struct in_addr override, struct in_addr fallback) |
1a6bca81 | 1494 | { |
73a08a24 | 1495 | if (override.s_addr != 0) |
1a6bca81 | 1496 | return override; |
73a08a24 | 1497 | else if (context) |
1a6bca81 | 1498 | return context->local; |
73a08a24 SK |
1499 | else |
1500 | return fallback; | |
1a6bca81 SK |
1501 | } |
1502 | ||
f2621c7f SK |
1503 | static int sanitise(unsigned char *opt, char *buf) |
1504 | { | |
1505 | char *p; | |
1506 | int i; | |
1507 | ||
1508 | *buf = 0; | |
1509 | ||
1510 | if (!opt) | |
1511 | return 0; | |
1512 | ||
1a6bca81 | 1513 | p = option_ptr(opt, 0); |
f2621c7f SK |
1514 | |
1515 | for (i = option_len(opt); i > 0; i--) | |
1516 | { | |
1517 | char c = *p++; | |
824af85b | 1518 | if (isprint((int)c)) |
f2621c7f SK |
1519 | *buf++ = c; |
1520 | } | |
1521 | *buf = 0; /* add terminator */ | |
1522 | ||
1523 | return 1; | |
1524 | } | |
1525 | ||
316e2730 SK |
1526 | #ifdef HAVE_SCRIPT |
1527 | static void add_extradata_data(struct dhcp_lease *lease, unsigned char *data, size_t len, int delim) | |
1528 | { | |
1529 | if ((lease->extradata_size - lease->extradata_len) < (len + 1)) | |
1530 | { | |
1531 | size_t newsz = lease->extradata_len + len + 100; | |
1532 | unsigned char *new = whine_malloc(newsz); | |
1533 | ||
1534 | if (!new) | |
1535 | return; | |
1536 | ||
1537 | if (lease->extradata) | |
1538 | { | |
1539 | memcpy(new, lease->extradata, lease->extradata_len); | |
1540 | free(lease->extradata); | |
1541 | } | |
1542 | ||
1543 | lease->extradata = new; | |
1544 | lease->extradata_size = newsz; | |
1545 | } | |
1546 | ||
1547 | if (len != 0) | |
1548 | memcpy(lease->extradata + lease->extradata_len, data, len); | |
1549 | lease->extradata[lease->extradata_len + len] = delim; | |
1550 | lease->extradata_len += len + 1; | |
1551 | } | |
1552 | ||
1553 | static void add_extradata_opt(struct dhcp_lease *lease, unsigned char *opt) | |
1554 | { | |
1555 | if (!opt) | |
1556 | add_extradata_data(lease, NULL, 0, 0); | |
1557 | else | |
1558 | { | |
1559 | size_t i, len = option_len(opt); | |
1560 | unsigned char *ucp = option_ptr(opt, 0); | |
1561 | ||
1562 | /* check for embeded NULLs */ | |
1563 | for (i = 0; i < len; i++) | |
1564 | if (ucp[i] == 0) | |
1565 | { | |
1566 | len = i; | |
1567 | break; | |
1568 | } | |
1569 | ||
1570 | add_extradata_data(lease, ucp, len, 0); | |
1571 | } | |
1572 | } | |
1573 | #endif | |
1574 | ||
5aabfc78 | 1575 | static void log_packet(char *type, void *addr, unsigned char *ext_mac, |
7622fc06 | 1576 | int mac_len, char *interface, char *string, u32 xid) |
5e9e0efb | 1577 | { |
1697269c | 1578 | struct in_addr a; |
7622fc06 | 1579 | |
1697269c SK |
1580 | /* addr may be misaligned */ |
1581 | if (addr) | |
1582 | memcpy(&a, addr, sizeof(a)); | |
1583 | ||
7622fc06 SK |
1584 | print_mac(daemon->namebuff, ext_mac, mac_len); |
1585 | ||
28866e95 | 1586 | if(option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1587 | my_syslog(MS_DHCP | LOG_INFO, "%u %s(%s) %s%s%s %s", |
1588 | ntohl(xid), | |
1589 | type, | |
1590 | interface, | |
1591 | addr ? inet_ntoa(a) : "", | |
1592 | addr ? " " : "", | |
1593 | daemon->namebuff, | |
1594 | string ? string : ""); | |
1595 | else | |
1596 | my_syslog(MS_DHCP | LOG_INFO, "%s(%s) %s%s%s %s", | |
1597 | type, | |
1598 | interface, | |
1599 | addr ? inet_ntoa(a) : "", | |
1600 | addr ? " " : "", | |
1601 | daemon->namebuff, | |
1602 | string ? string : ""); | |
f2621c7f SK |
1603 | } |
1604 | ||
7622fc06 | 1605 | static void log_options(unsigned char *start, u32 xid) |
f2621c7f SK |
1606 | { |
1607 | while (*start != OPTION_END) | |
1608 | { | |
7622fc06 SK |
1609 | int is_ip, is_name, i; |
1610 | char *text = option_string(start[0], &is_ip, &is_name); | |
1611 | unsigned char trunc = option_len(start); | |
1612 | ||
1613 | if (is_ip) | |
1614 | for (daemon->namebuff[0]= 0, i = 0; i <= trunc - INADDRSZ; i += INADDRSZ) | |
1615 | { | |
1616 | if (i != 0) | |
1617 | strncat(daemon->namebuff, ", ", 256 - strlen(daemon->namebuff)); | |
1618 | strncat(daemon->namebuff, inet_ntoa(option_addr_arr(start, i)), 256 - strlen(daemon->namebuff)); | |
1619 | } | |
1620 | else if (!is_name || !sanitise(start, daemon->namebuff)) | |
1621 | { | |
1622 | if (trunc > 13) | |
1623 | trunc = 13; | |
1624 | print_mac(daemon->namebuff, option_ptr(start, 0), trunc); | |
1625 | } | |
1626 | ||
1627 | my_syslog(MS_DHCP | LOG_INFO, "%u sent size:%3d option:%3d%s%s%s%s%s", | |
1628 | ntohl(xid), option_len(start), start[0], | |
f2621c7f | 1629 | text ? ":" : "", text ? text : "", |
7622fc06 SK |
1630 | trunc == 0 ? "" : " ", |
1631 | trunc == 0 ? "" : daemon->namebuff, | |
1632 | trunc == option_len(start) ? "" : "..."); | |
f2621c7f SK |
1633 | start += start[1] + 2; |
1634 | } | |
9e4abcb5 SK |
1635 | } |
1636 | ||
1b7ecd11 SK |
1637 | static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt, int minsize) |
1638 | { | |
1a6bca81 | 1639 | while (1) |
1b7ecd11 | 1640 | { |
1a6bca81 SK |
1641 | if (p > end) |
1642 | return NULL; | |
1643 | else if (*p == OPTION_END) | |
1644 | return opt == OPTION_END ? p : NULL; | |
1b7ecd11 SK |
1645 | else if (*p == OPTION_PAD) |
1646 | p++; | |
1647 | else | |
1648 | { | |
1649 | int opt_len; | |
1a6bca81 | 1650 | if (p > end - 2) |
1b7ecd11 SK |
1651 | return NULL; /* malformed packet */ |
1652 | opt_len = option_len(p); | |
1a6bca81 | 1653 | if (p > end - (2 + opt_len)) |
1b7ecd11 SK |
1654 | return NULL; /* malformed packet */ |
1655 | if (*p == opt && opt_len >= minsize) | |
1656 | return p; | |
1657 | p += opt_len + 2; | |
1658 | } | |
1659 | } | |
1b7ecd11 SK |
1660 | } |
1661 | ||
1662 | static unsigned char *option_find(struct dhcp_packet *mess, size_t size, int opt_type, int minsize) | |
1663 | { | |
1664 | unsigned char *ret, *overload; | |
1665 | ||
1666 | /* skip over DHCP cookie; */ | |
1667 | if ((ret = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, opt_type, minsize))) | |
1668 | return ret; | |
1669 | ||
1670 | /* look for overload option. */ | |
1671 | if (!(overload = option_find1(&mess->options[0] + sizeof(u32), ((unsigned char *)mess) + size, OPTION_OVERLOAD, 1))) | |
1672 | return NULL; | |
1673 | ||
1674 | /* Can we look in filename area ? */ | |
1675 | if ((overload[2] & 1) && | |
1676 | (ret = option_find1(&mess->file[0], &mess->file[128], opt_type, minsize))) | |
1677 | return ret; | |
1678 | ||
1679 | /* finally try sname area */ | |
1680 | if ((overload[2] & 2) && | |
1681 | (ret = option_find1(&mess->sname[0], &mess->sname[64], opt_type, minsize))) | |
1682 | return ret; | |
1683 | ||
1684 | return NULL; | |
1685 | } | |
1686 | ||
7622fc06 | 1687 | static struct in_addr option_addr_arr(unsigned char *opt, int offset) |
9e4abcb5 SK |
1688 | { |
1689 | /* this worries about unaligned data in the option. */ | |
1690 | /* struct in_addr is network byte order */ | |
1691 | struct in_addr ret; | |
1692 | ||
7622fc06 | 1693 | memcpy(&ret, option_ptr(opt, offset), INADDRSZ); |
9e4abcb5 SK |
1694 | |
1695 | return ret; | |
1696 | } | |
1697 | ||
7622fc06 SK |
1698 | static struct in_addr option_addr(unsigned char *opt) |
1699 | { | |
1700 | return option_addr_arr(opt, 0); | |
1701 | } | |
1702 | ||
1703 | static unsigned int option_uint(unsigned char *opt, int offset, int size) | |
9e4abcb5 SK |
1704 | { |
1705 | /* this worries about unaligned data and byte order */ | |
44a2a316 SK |
1706 | unsigned int ret = 0; |
1707 | int i; | |
7622fc06 | 1708 | unsigned char *p = option_ptr(opt, offset); |
9e4abcb5 | 1709 | |
44a2a316 SK |
1710 | for (i = 0; i < size; i++) |
1711 | ret = (ret << 8) | *p++; | |
1712 | ||
1713 | return ret; | |
9e4abcb5 SK |
1714 | } |
1715 | ||
1b7ecd11 | 1716 | static unsigned char *dhcp_skip_opts(unsigned char *start) |
9e4abcb5 | 1717 | { |
1b7ecd11 SK |
1718 | while (*start != 0) |
1719 | start += start[1] + 2; | |
1720 | return start; | |
1721 | } | |
26128d27 | 1722 | |
1b7ecd11 SK |
1723 | /* only for use when building packet: doesn't check for bad data. */ |
1724 | static unsigned char *find_overload(struct dhcp_packet *mess) | |
1725 | { | |
1726 | unsigned char *p = &mess->options[0] + sizeof(u32); | |
26128d27 | 1727 | |
1b7ecd11 | 1728 | while (*p != 0) |
26128d27 | 1729 | { |
1b7ecd11 SK |
1730 | if (*p == OPTION_OVERLOAD) |
1731 | return p; | |
1732 | p += p[1] + 2; | |
26128d27 | 1733 | } |
1b7ecd11 | 1734 | return NULL; |
9e4abcb5 SK |
1735 | } |
1736 | ||
7622fc06 SK |
1737 | static size_t dhcp_packet_size(struct dhcp_packet *mess, struct dhcp_netid *netid, |
1738 | unsigned char *agent_id, unsigned char *real_end) | |
b8187c80 | 1739 | { |
1b7ecd11 SK |
1740 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); |
1741 | unsigned char *overload; | |
1742 | size_t ret; | |
824af85b | 1743 | struct dhcp_netid_list *id_list; |
9009d746 | 1744 | struct dhcp_netid *n; |
f2621c7f | 1745 | |
7622fc06 SK |
1746 | /* move agent_id back down to the end of the packet */ |
1747 | if (agent_id) | |
1748 | { | |
7622fc06 SK |
1749 | memmove(p, agent_id, real_end - agent_id); |
1750 | p += real_end - agent_id; | |
1751 | memset(p, 0, real_end - p); /* in case of overlap */ | |
1752 | } | |
1753 | ||
f2621c7f | 1754 | /* We do logging too */ |
28866e95 | 1755 | if (netid && option_bool(OPT_LOG_OPTS)) |
f2621c7f | 1756 | { |
1f15b81d SK |
1757 | char *s = daemon->namebuff; |
1758 | for (*s = 0; netid; netid = netid->next) | |
f2621c7f | 1759 | { |
9009d746 SK |
1760 | /* kill dupes. */ |
1761 | for (n = netid->next; n; n = n->next) | |
1762 | if (strcmp(netid->net, n->net) == 0) | |
1763 | break; | |
1764 | ||
1765 | if (!n) | |
1766 | { | |
1f15b81d | 1767 | strncat (s, netid->net, (MAXDNAME-1) - strlen(s)); |
9009d746 | 1768 | if (netid->next) |
1f15b81d | 1769 | strncat (s, ", ", (MAXDNAME-1) - strlen(s)); |
9009d746 | 1770 | } |
f2621c7f | 1771 | } |
1f15b81d | 1772 | my_syslog(MS_DHCP | LOG_INFO, _("%u tags: %s"), ntohl(mess->xid), s); |
f2621c7f | 1773 | } |
1b7ecd11 SK |
1774 | |
1775 | /* add END options to the regions. */ | |
7622fc06 SK |
1776 | overload = find_overload(mess); |
1777 | ||
1778 | if (overload && (option_uint(overload, 0, 1) & 1)) | |
b8187c80 | 1779 | { |
7622fc06 | 1780 | *dhcp_skip_opts(mess->file) = OPTION_END; |
28866e95 | 1781 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1782 | log_options(mess->file, mess->xid); |
1783 | } | |
28866e95 | 1784 | else if (option_bool(OPT_LOG_OPTS) && strlen((char *)mess->file) != 0) |
7622fc06 SK |
1785 | my_syslog(MS_DHCP | LOG_INFO, _("%u bootfile name: %s"), ntohl(mess->xid), (char *)mess->file); |
1786 | ||
1787 | if (overload && (option_uint(overload, 0, 1) & 2)) | |
1788 | { | |
1789 | *dhcp_skip_opts(mess->sname) = OPTION_END; | |
28866e95 | 1790 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 | 1791 | log_options(mess->sname, mess->xid); |
b8187c80 | 1792 | } |
28866e95 | 1793 | else if (option_bool(OPT_LOG_OPTS) && strlen((char *)mess->sname) != 0) |
7622fc06 SK |
1794 | my_syslog(MS_DHCP | LOG_INFO, _("%u server name: %s"), ntohl(mess->xid), (char *)mess->sname); |
1795 | ||
b8187c80 | 1796 | |
1b7ecd11 | 1797 | *p++ = OPTION_END; |
824af85b | 1798 | |
8ef5ada2 SK |
1799 | for (id_list = daemon->force_broadcast; id_list; id_list = id_list->next) |
1800 | if ((!id_list->list) || match_netid(id_list->list, netid, 0)) | |
1801 | break; | |
1802 | if (id_list) | |
1803 | mess->flags |= htons(0x8000); /* force broadcast */ | |
1804 | ||
28866e95 | 1805 | if (option_bool(OPT_LOG_OPTS)) |
7622fc06 SK |
1806 | { |
1807 | if (mess->siaddr.s_addr != 0) | |
1808 | my_syslog(MS_DHCP | LOG_INFO, _("%u next server: %s"), ntohl(mess->xid), inet_ntoa(mess->siaddr)); | |
1809 | ||
8ef5ada2 SK |
1810 | if ((mess->flags & htons(0x8000)) && mess->ciaddr.s_addr == 0) |
1811 | my_syslog(MS_DHCP | LOG_INFO, _("%u broadcast response"), ntohl(mess->xid)); | |
1812 | ||
7622fc06 SK |
1813 | log_options(&mess->options[0] + sizeof(u32), mess->xid); |
1814 | } | |
1b7ecd11 SK |
1815 | |
1816 | ret = (size_t)(p - (unsigned char *)mess); | |
1817 | ||
1818 | if (ret < MIN_PACKETSZ) | |
1819 | ret = MIN_PACKETSZ; | |
8ef5ada2 | 1820 | |
1b7ecd11 | 1821 | return ret; |
b8187c80 SK |
1822 | } |
1823 | ||
1b7ecd11 | 1824 | static unsigned char *free_space(struct dhcp_packet *mess, unsigned char *end, int opt, int len) |
9e4abcb5 | 1825 | { |
1b7ecd11 | 1826 | unsigned char *p = dhcp_skip_opts(&mess->options[0] + sizeof(u32)); |
44a2a316 | 1827 | |
1b7ecd11 SK |
1828 | if (p + len + 3 >= end) |
1829 | /* not enough space in options area, try and use overload, if poss */ | |
1830 | { | |
1831 | unsigned char *overload; | |
1832 | ||
1833 | if (!(overload = find_overload(mess)) && | |
1834 | (mess->file[0] == 0 || mess->sname[0] == 0)) | |
1835 | { | |
1836 | /* attempt to overload fname and sname areas, we've reserved space for the | |
1837 | overflow option previuously. */ | |
1838 | overload = p; | |
1839 | *(p++) = OPTION_OVERLOAD; | |
1840 | *(p++) = 1; | |
1841 | } | |
1842 | ||
1843 | p = NULL; | |
1844 | ||
1845 | /* using filename field ? */ | |
1846 | if (overload) | |
1847 | { | |
1848 | if (mess->file[0] == 0) | |
1849 | overload[2] |= 1; | |
1850 | ||
1851 | if (overload[2] & 1) | |
1852 | { | |
1853 | p = dhcp_skip_opts(mess->file); | |
1854 | if (p + len + 3 >= mess->file + sizeof(mess->file)) | |
1855 | p = NULL; | |
1856 | } | |
1857 | ||
1858 | if (!p) | |
1859 | { | |
1860 | /* try to bring sname into play (it may be already) */ | |
1861 | if (mess->sname[0] == 0) | |
1862 | overload[2] |= 2; | |
1863 | ||
1864 | if (overload[2] & 2) | |
1865 | { | |
1866 | p = dhcp_skip_opts(mess->sname); | |
1867 | if (p + len + 3 >= mess->sname + sizeof(mess->file)) | |
1868 | p = NULL; | |
1869 | } | |
1870 | } | |
1871 | } | |
1872 | ||
1873 | if (!p) | |
7622fc06 | 1874 | my_syslog(MS_DHCP | LOG_WARNING, _("cannot send DHCP/BOOTP option %d: no space left in packet"), opt); |
1b7ecd11 SK |
1875 | } |
1876 | ||
1877 | if (p) | |
9e4abcb5 SK |
1878 | { |
1879 | *(p++) = opt; | |
a222641c | 1880 | *(p++) = len; |
9e4abcb5 | 1881 | } |
1b7ecd11 | 1882 | |
9e4abcb5 SK |
1883 | return p; |
1884 | } | |
1b7ecd11 SK |
1885 | |
1886 | static void option_put(struct dhcp_packet *mess, unsigned char *end, int opt, int len, unsigned int val) | |
a222641c | 1887 | { |
1b7ecd11 SK |
1888 | int i; |
1889 | unsigned char *p = free_space(mess, end, opt, len); | |
a222641c | 1890 | |
1b7ecd11 SK |
1891 | if (p) |
1892 | for (i = 0; i < len; i++) | |
1893 | *(p++) = val >> (8 * (len - (i + 1))); | |
a222641c SK |
1894 | } |
1895 | ||
1b7ecd11 SK |
1896 | static void option_put_string(struct dhcp_packet *mess, unsigned char *end, int opt, |
1897 | char *string, int null_term) | |
44a2a316 | 1898 | { |
1b7ecd11 | 1899 | unsigned char *p; |
0a852541 | 1900 | size_t len = strlen(string); |
3be34541 | 1901 | |
cdeda28f SK |
1902 | if (null_term && len != 255) |
1903 | len++; | |
1904 | ||
1b7ecd11 SK |
1905 | if ((p = free_space(mess, end, opt, len))) |
1906 | memcpy(p, string, len); | |
44a2a316 | 1907 | } |
1b7ecd11 SK |
1908 | |
1909 | /* return length, note this only does the data part */ | |
73a08a24 | 1910 | static int do_opt(struct dhcp_opt *opt, unsigned char *p, struct dhcp_context *context, int null_term) |
9e4abcb5 | 1911 | { |
1b7ecd11 SK |
1912 | int len = opt->len; |
1913 | ||
1914 | if ((opt->flags & DHOPT_STRING) && null_term && len != 255) | |
1915 | len++; | |
1916 | ||
1917 | if (p && len != 0) | |
9e4abcb5 | 1918 | { |
73a08a24 | 1919 | if (context && (opt->flags & DHOPT_ADDR)) |
1b7ecd11 SK |
1920 | { |
1921 | int j; | |
1922 | struct in_addr *a = (struct in_addr *)opt->val; | |
1923 | for (j = 0; j < opt->len; j+=INADDRSZ, a++) | |
1924 | { | |
1925 | /* zero means "self" (but not in vendorclass options.) */ | |
1926 | if (a->s_addr == 0) | |
73a08a24 | 1927 | memcpy(p, &context->local, INADDRSZ); |
1b7ecd11 SK |
1928 | else |
1929 | memcpy(p, a, INADDRSZ); | |
1930 | p += INADDRSZ; | |
1931 | } | |
9e4abcb5 | 1932 | } |
1b7ecd11 SK |
1933 | else |
1934 | memcpy(p, opt->val, len); | |
1935 | } | |
1936 | return len; | |
9e4abcb5 | 1937 | } |
7622fc06 | 1938 | |
9e4abcb5 SK |
1939 | static int in_list(unsigned char *list, int opt) |
1940 | { | |
1941 | int i; | |
6b01084f SK |
1942 | |
1943 | /* If no requested options, send everything, not nothing. */ | |
a84fa1d0 SK |
1944 | if (!list) |
1945 | return 1; | |
1946 | ||
9e4abcb5 SK |
1947 | for (i = 0; list[i] != OPTION_END; i++) |
1948 | if (opt == list[i]) | |
1949 | return 1; | |
1950 | ||
1951 | return 0; | |
1952 | } | |
1953 | ||
a222641c | 1954 | static struct dhcp_opt *option_find2(struct dhcp_netid *netid, struct dhcp_opt *opts, int opt) |
9e4abcb5 | 1955 | { |
91dccd09 | 1956 | struct dhcp_opt *tmp; |
a84fa1d0 | 1957 | for (tmp = opts; tmp; tmp = tmp->next) |
316e2730 | 1958 | if (tmp->opt == opt && !(tmp->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR | DHOPT_RFC3925))) |
8ef5ada2 | 1959 | if (match_netid(tmp->netid, netid, 0)) |
cdeda28f | 1960 | return tmp; |
8ef5ada2 SK |
1961 | |
1962 | /* No match, look for one without a netid */ | |
1963 | for (tmp = opts; tmp; tmp = tmp->next) | |
1964 | if (tmp->opt == opt && !(tmp->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR | DHOPT_RFC3925))) | |
1965 | if (match_netid(tmp->netid, netid, 1)) | |
1966 | return tmp; | |
1967 | ||
1968 | return NULL; | |
9e4abcb5 SK |
1969 | } |
1970 | ||
6b01084f SK |
1971 | /* mark vendor-encapsulated options which match the client-supplied or |
1972 | config-supplied vendor class */ | |
1973 | static void match_vendor_opts(unsigned char *opt, struct dhcp_opt *dopt) | |
1974 | { | |
1975 | for (; dopt; dopt = dopt->next) | |
1976 | { | |
7622fc06 | 1977 | dopt->flags &= ~DHOPT_VENDOR_MATCH; |
73a08a24 | 1978 | if (opt && (dopt->flags & DHOPT_VENDOR)) |
6b01084f SK |
1979 | { |
1980 | int i, len = 0; | |
73a08a24 SK |
1981 | if (dopt->u.vendor_class) |
1982 | len = strlen((char *)dopt->u.vendor_class); | |
6b01084f | 1983 | for (i = 0; i <= (option_len(opt) - len); i++) |
73a08a24 | 1984 | if (len == 0 || memcmp(dopt->u.vendor_class, option_ptr(opt, i), len) == 0) |
6b01084f | 1985 | { |
7622fc06 | 1986 | dopt->flags |= DHOPT_VENDOR_MATCH; |
6b01084f SK |
1987 | break; |
1988 | } | |
1989 | } | |
1990 | } | |
1991 | } | |
1992 | ||
8ef5ada2 SK |
1993 | static int do_encap_opts(struct dhcp_opt *opt, int encap, int flag, |
1994 | struct dhcp_packet *mess, unsigned char *end, int null_term) | |
73a08a24 | 1995 | { |
8ef5ada2 | 1996 | int len, enc_len, ret = 0; |
7622fc06 | 1997 | struct dhcp_opt *start; |
73a08a24 SK |
1998 | unsigned char *p; |
1999 | ||
2000 | /* find size in advance */ | |
7622fc06 SK |
2001 | for (enc_len = 0, start = opt; opt; opt = opt->next) |
2002 | if (opt->flags & flag) | |
73a08a24 SK |
2003 | { |
2004 | int new = do_opt(opt, NULL, NULL, null_term) + 2; | |
8ef5ada2 | 2005 | ret = 1; |
73a08a24 SK |
2006 | if (enc_len + new <= 255) |
2007 | enc_len += new; | |
2008 | else | |
2009 | { | |
2010 | p = free_space(mess, end, encap, enc_len); | |
2011 | for (; start && start != opt; start = start->next) | |
7622fc06 | 2012 | if (p && (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 | enc_len = new; | |
2020 | start = opt; | |
2021 | } | |
2022 | } | |
2023 | ||
2024 | if (enc_len != 0 && | |
2025 | (p = free_space(mess, end, encap, enc_len + 1))) | |
2026 | { | |
2027 | for (; start; start = start->next) | |
7622fc06 | 2028 | if (start->flags & flag) |
73a08a24 SK |
2029 | { |
2030 | len = do_opt(start, p + 2, NULL, null_term); | |
2031 | *(p++) = start->opt; | |
2032 | *(p++) = len; | |
2033 | p += len; | |
2034 | } | |
2035 | *p = OPTION_END; | |
2036 | } | |
8ef5ada2 SK |
2037 | |
2038 | return ret; | |
73a08a24 SK |
2039 | } |
2040 | ||
7622fc06 | 2041 | static void pxe_misc(struct dhcp_packet *mess, unsigned char *end, unsigned char *uuid) |
91dccd09 | 2042 | { |
7622fc06 SK |
2043 | unsigned char *p; |
2044 | ||
2045 | option_put_string(mess, end, OPTION_VENDOR_ID, "PXEClient", 0); | |
2046 | if (uuid && (p = free_space(mess, end, OPTION_PXE_UUID, 17))) | |
2047 | memcpy(p, uuid, 17); | |
2048 | } | |
2049 | ||
2050 | static int prune_vendor_opts(struct dhcp_netid *netid) | |
2051 | { | |
2052 | int force = 0; | |
2053 | struct dhcp_opt *opt; | |
9e038946 | 2054 | |
7622fc06 SK |
2055 | /* prune vendor-encapsulated options based on netid, and look if we're forcing them to be sent */ |
2056 | for (opt = daemon->dhcp_opts; opt; opt = opt->next) | |
2057 | if (opt->flags & DHOPT_VENDOR_MATCH) | |
2058 | { | |
2059 | if (!match_netid(opt->netid, netid, 1)) | |
2060 | opt->flags &= ~DHOPT_VENDOR_MATCH; | |
2061 | else if (opt->flags & DHOPT_FORCE) | |
2062 | force = 1; | |
2063 | } | |
2064 | return force; | |
2065 | } | |
2066 | ||
316e2730 | 2067 | static struct dhcp_opt *pxe_opts(int pxe_arch, struct dhcp_netid *netid, struct in_addr local) |
7622fc06 SK |
2068 | { |
2069 | #define NUM_OPTS 4 | |
2070 | ||
2071 | unsigned char *p, *q; | |
2072 | struct pxe_service *service; | |
2073 | static struct dhcp_opt *o, *ret; | |
2074 | int i, j = NUM_OPTS - 1; | |
316e2730 | 2075 | struct in_addr boot_server; |
7622fc06 SK |
2076 | |
2077 | /* We pass back references to these, hence they are declared static */ | |
2078 | static unsigned char discovery_control; | |
2079 | static unsigned char fake_prompt[] = { 0, 'P', 'X', 'E' }; | |
2080 | static struct dhcp_opt *fake_opts = NULL; | |
2081 | ||
316e2730 SK |
2082 | /* Disable multicast, since we don't support it, and broadcast |
2083 | unless we need it */ | |
2084 | discovery_control = 3; | |
7622fc06 SK |
2085 | |
2086 | ret = daemon->dhcp_opts; | |
2087 | ||
2088 | if (!fake_opts && !(fake_opts = whine_malloc(NUM_OPTS * sizeof(struct dhcp_opt)))) | |
2089 | return ret; | |
2090 | ||
2091 | for (i = 0; i < NUM_OPTS; i++) | |
2092 | { | |
2093 | fake_opts[i].flags = DHOPT_VENDOR_MATCH; | |
2094 | fake_opts[i].netid = NULL; | |
2095 | fake_opts[i].next = i == (NUM_OPTS - 1) ? ret : &fake_opts[i+1]; | |
2096 | } | |
2097 | ||
2098 | /* create the data for the PXE_MENU and PXE_SERVERS options. */ | |
2099 | p = (unsigned char *)daemon->dhcp_buff; | |
8ef5ada2 | 2100 | q = (unsigned char *)daemon->dhcp_buff3; |
7622fc06 SK |
2101 | |
2102 | for (i = 0, service = daemon->pxe_services; service; service = service->next) | |
2103 | if (pxe_arch == service->CSA && match_netid(service->netid, netid, 1)) | |
2104 | { | |
2105 | size_t len = strlen(service->menu); | |
2106 | /* opt 43 max size is 255. encapsulated option has type and length | |
2107 | bytes, so its max size is 253. */ | |
2108 | if (p - (unsigned char *)daemon->dhcp_buff + len + 3 < 253) | |
2109 | { | |
2110 | *(p++) = service->type >> 8; | |
2111 | *(p++) = service->type; | |
2112 | *(p++) = len; | |
2113 | memcpy(p, service->menu, len); | |
2114 | p += len; | |
2115 | i++; | |
2116 | } | |
2117 | else | |
2118 | { | |
2119 | toobig: | |
2120 | my_syslog(MS_DHCP | LOG_ERR, _("PXE menu too large")); | |
2121 | return daemon->dhcp_opts; | |
2122 | } | |
2123 | ||
316e2730 SK |
2124 | boot_server = service->basename ? local : service->server; |
2125 | ||
2126 | if (boot_server.s_addr != 0) | |
7622fc06 | 2127 | { |
8ef5ada2 | 2128 | if (q - (unsigned char *)daemon->dhcp_buff3 + 3 + INADDRSZ >= 253) |
316e2730 SK |
2129 | goto toobig; |
2130 | ||
2131 | /* Boot service with known address - give it */ | |
2132 | *(q++) = service->type >> 8; | |
2133 | *(q++) = service->type; | |
2134 | *(q++) = 1; | |
2135 | /* dest misaligned */ | |
2136 | memcpy(q, &boot_server.s_addr, INADDRSZ); | |
2137 | q += INADDRSZ; | |
2138 | } | |
2139 | else if (service->type != 0) | |
2140 | /* We don't know the server for a service type, so we'll | |
2141 | allow the client to broadcast for it */ | |
2142 | discovery_control = 2; | |
7622fc06 SK |
2143 | } |
2144 | ||
2145 | /* if no prompt, wait forever if there's a choice */ | |
2146 | fake_prompt[0] = (i > 1) ? 255 : 0; | |
2147 | ||
2148 | if (i == 0) | |
2149 | discovery_control = 8; /* no menu - just use use mess->filename */ | |
2150 | else | |
2151 | { | |
2152 | ret = &fake_opts[j--]; | |
2153 | ret->len = p - (unsigned char *)daemon->dhcp_buff; | |
2154 | ret->val = (unsigned char *)daemon->dhcp_buff; | |
2155 | ret->opt = SUBOPT_PXE_MENU; | |
2156 | ||
8ef5ada2 | 2157 | if (q - (unsigned char *)daemon->dhcp_buff3 != 0) |
7622fc06 SK |
2158 | { |
2159 | ret = &fake_opts[j--]; | |
8ef5ada2 SK |
2160 | ret->len = q - (unsigned char *)daemon->dhcp_buff3; |
2161 | ret->val = (unsigned char *)daemon->dhcp_buff3; | |
7622fc06 SK |
2162 | ret->opt = SUBOPT_PXE_SERVERS; |
2163 | } | |
2164 | } | |
2165 | ||
2166 | for (o = daemon->dhcp_opts; o; o = o->next) | |
2167 | if ((o->flags & DHOPT_VENDOR_MATCH) && o->opt == SUBOPT_PXE_MENU_PROMPT) | |
2168 | break; | |
2169 | ||
2170 | if (!o) | |
2171 | { | |
2172 | ret = &fake_opts[j--]; | |
2173 | ret->len = sizeof(fake_prompt); | |
2174 | ret->val = fake_prompt; | |
2175 | ret->opt = SUBOPT_PXE_MENU_PROMPT; | |
2176 | } | |
2177 | ||
316e2730 SK |
2178 | ret = &fake_opts[j--]; |
2179 | ret->len = 1; | |
2180 | ret->opt = SUBOPT_PXE_DISCOVERY; | |
2181 | ret->val= &discovery_control; | |
2182 | ||
7622fc06 SK |
2183 | return ret; |
2184 | } | |
2185 | ||
2186 | static void clear_packet(struct dhcp_packet *mess, unsigned char *end) | |
2187 | { | |
1b7ecd11 SK |
2188 | memset(mess->sname, 0, sizeof(mess->sname)); |
2189 | memset(mess->file, 0, sizeof(mess->file)); | |
2190 | memset(&mess->options[0] + sizeof(u32), 0, end - (&mess->options[0] + sizeof(u32))); | |
2191 | mess->siaddr.s_addr = 0; | |
2192 | } | |
cdeda28f | 2193 | |
7622fc06 SK |
2194 | struct dhcp_boot *find_boot(struct dhcp_netid *netid) |
2195 | { | |
2196 | struct dhcp_boot *boot; | |
2197 | ||
2198 | /* decide which dhcp-boot option we're using */ | |
2199 | for (boot = daemon->boot_config; boot; boot = boot->next) | |
2200 | if (match_netid(boot->netid, netid, 0)) | |
2201 | break; | |
2202 | if (!boot) | |
2203 | /* No match, look for one without a netid */ | |
2204 | for (boot = daemon->boot_config; boot; boot = boot->next) | |
2205 | if (match_netid(boot->netid, netid, 1)) | |
2206 | break; | |
2207 | ||
2208 | return boot; | |
9e038946 SK |
2209 | } |
2210 | ||
1b7ecd11 SK |
2211 | static void do_options(struct dhcp_context *context, |
2212 | struct dhcp_packet *mess, | |
7622fc06 | 2213 | unsigned char *end, |
1b7ecd11 | 2214 | unsigned char *req_options, |
9009d746 SK |
2215 | char *hostname, |
2216 | char *domain, char *config_domain, | |
1b7ecd11 SK |
2217 | struct dhcp_netid *netid, |
2218 | struct in_addr subnet_addr, | |
2219 | unsigned char fqdn_flags, | |
7622fc06 | 2220 | int null_term, int pxe_arch, |
8ef5ada2 SK |
2221 | unsigned char *uuid, |
2222 | int vendor_class_len) | |
1b7ecd11 SK |
2223 | { |
2224 | struct dhcp_opt *opt, *config_opts = daemon->dhcp_opts; | |
2225 | struct dhcp_boot *boot; | |
7622fc06 | 2226 | unsigned char *p; |
f2621c7f | 2227 | int i, len, force_encap = 0; |
1b7ecd11 | 2228 | unsigned char f0 = 0, s0 = 0; |
824af85b | 2229 | int done_file = 0, done_server = 0; |
8ef5ada2 | 2230 | int done_vendor_class = 0; |
1b7ecd11 | 2231 | |
9009d746 | 2232 | if (config_domain && (!domain || !hostname_isequal(domain, config_domain))) |
7622fc06 | 2233 | my_syslog(MS_DHCP | LOG_WARNING, _("Ignoring domain %s for DHCP host name %s"), config_domain, hostname); |
9009d746 | 2234 | |
f2621c7f | 2235 | /* logging */ |
28866e95 | 2236 | if (option_bool(OPT_LOG_OPTS) && req_options) |
f2621c7f SK |
2237 | { |
2238 | char *q = daemon->namebuff; | |
2239 | for (i = 0; req_options[i] != OPTION_END; i++) | |
2240 | { | |
7622fc06 | 2241 | char *s = option_string(req_options[i], NULL, NULL); |
824af85b SK |
2242 | q += snprintf(q, MAXDNAME - (q - daemon->namebuff), |
2243 | "%d%s%s%s", | |
2244 | req_options[i], | |
2245 | s ? ":" : "", | |
2246 | s ? s : "", | |
2247 | req_options[i+1] == OPTION_END ? "" : ", "); | |
f2621c7f SK |
2248 | if (req_options[i+1] == OPTION_END || (q - daemon->namebuff) > 40) |
2249 | { | |
2250 | q = daemon->namebuff; | |
7622fc06 | 2251 | my_syslog(MS_DHCP | LOG_INFO, _("%u requested options: %s"), ntohl(mess->xid), daemon->namebuff); |
f2621c7f SK |
2252 | } |
2253 | } | |
2254 | } | |
2255 | ||
73a08a24 SK |
2256 | if (context) |
2257 | mess->siaddr = context->local; | |
1b7ecd11 SK |
2258 | |
2259 | /* See if we can send the boot stuff as options. | |
2260 | To do this we need a requested option list, BOOTP | |
824af85b SK |
2261 | and very old DHCP clients won't have this, we also |
2262 | provide an manual option to disable it. | |
1b7ecd11 | 2263 | Some PXE ROMs have bugs (surprise!) and need zero-terminated |
7622fc06 SK |
2264 | names, so we always send those. */ |
2265 | if ((boot = find_boot(netid))) | |
91dccd09 | 2266 | { |
1b7ecd11 | 2267 | if (boot->sname) |
824af85b | 2268 | { |
28866e95 | 2269 | if (!option_bool(OPT_NO_OVERRIDE) && |
824af85b SK |
2270 | req_options && |
2271 | in_list(req_options, OPTION_SNAME)) | |
1b7ecd11 | 2272 | option_put_string(mess, end, OPTION_SNAME, boot->sname, 1); |
91dccd09 | 2273 | else |
824af85b | 2274 | strncpy((char *)mess->sname, boot->sname, sizeof(mess->sname)-1); |
91dccd09 | 2275 | } |
1b7ecd11 SK |
2276 | |
2277 | if (boot->file) | |
2278 | { | |
28866e95 | 2279 | if (!option_bool(OPT_NO_OVERRIDE) && |
824af85b SK |
2280 | req_options && |
2281 | in_list(req_options, OPTION_FILENAME)) | |
1b7ecd11 SK |
2282 | option_put_string(mess, end, OPTION_FILENAME, boot->file, 1); |
2283 | else | |
824af85b | 2284 | strncpy((char *)mess->file, boot->file, sizeof(mess->file)-1); |
1b7ecd11 SK |
2285 | } |
2286 | ||
2287 | if (boot->next_server.s_addr) | |
2288 | mess->siaddr = boot->next_server; | |
91dccd09 | 2289 | } |
824af85b SK |
2290 | else |
2291 | /* Use the values of the relevant options if no dhcp-boot given and | |
1f15b81d SK |
2292 | they're not explicitly asked for as options. OPTION_END is used |
2293 | as an internal way to specify siaddr without using dhcp-boot, for use in | |
2294 | dhcp-optsfile. */ | |
824af85b | 2295 | { |
8ef5ada2 | 2296 | if ((!req_options || !in_list(req_options, OPTION_FILENAME)) && |
1f15b81d | 2297 | (opt = option_find2(netid, config_opts, OPTION_FILENAME)) && !(opt->flags & DHOPT_FORCE)) |
824af85b SK |
2298 | { |
2299 | strncpy((char *)mess->file, (char *)opt->val, sizeof(mess->file)-1); | |
2300 | done_file = 1; | |
2301 | } | |
7622fc06 | 2302 | |
824af85b | 2303 | if ((!req_options || !in_list(req_options, OPTION_SNAME)) && |
1f15b81d | 2304 | (opt = option_find2(netid, config_opts, OPTION_SNAME)) && !(opt->flags & DHOPT_FORCE)) |
824af85b SK |
2305 | { |
2306 | strncpy((char *)mess->sname, (char *)opt->val, sizeof(mess->sname)-1); | |
2307 | done_server = 1; | |
2308 | } | |
1f15b81d SK |
2309 | |
2310 | if ((opt = option_find2(netid, config_opts, OPTION_END))) | |
2311 | mess->siaddr.s_addr = ((struct in_addr *)opt->val)->s_addr; | |
824af85b | 2312 | } |
7622fc06 | 2313 | |
1b7ecd11 SK |
2314 | /* We don't want to do option-overload for BOOTP, so make the file and sname |
2315 | fields look like they are in use, even when they aren't. This gets restored | |
2316 | at the end of this function. */ | |
2317 | ||
28866e95 | 2318 | if (!req_options || option_bool(OPT_NO_OVERRIDE)) |
91dccd09 | 2319 | { |
1b7ecd11 SK |
2320 | f0 = mess->file[0]; |
2321 | mess->file[0] = 1; | |
2322 | s0 = mess->sname[0]; | |
2323 | mess->sname[0] = 1; | |
91dccd09 | 2324 | } |
1b7ecd11 SK |
2325 | |
2326 | /* At this point, if mess->sname or mess->file are zeroed, they are available | |
2327 | for option overload, reserve space for the overload option. */ | |
2328 | if (mess->file[0] == 0 || mess->sname[0] == 0) | |
2329 | end -= 3; | |
91dccd09 | 2330 | |
3be34541 SK |
2331 | /* rfc3011 says this doesn't need to be in the requested options list. */ |
2332 | if (subnet_addr.s_addr) | |
1b7ecd11 | 2333 | option_put(mess, end, OPTION_SUBNET_SELECT, INADDRSZ, ntohl(subnet_addr.s_addr)); |
9e4abcb5 | 2334 | |
73a08a24 SK |
2335 | /* replies to DHCPINFORM may not have a valid context */ |
2336 | if (context) | |
2337 | { | |
2338 | if (!option_find2(netid, config_opts, OPTION_NETMASK)) | |
2339 | option_put(mess, end, OPTION_NETMASK, INADDRSZ, ntohl(context->netmask.s_addr)); | |
9e4abcb5 | 2340 | |
73a08a24 SK |
2341 | /* May not have a "guessed" broadcast address if we got no packets via a relay |
2342 | from this net yet (ie just unicast renewals after a restart */ | |
2343 | if (context->broadcast.s_addr && | |
2344 | !option_find2(netid, config_opts, OPTION_BROADCAST)) | |
2345 | option_put(mess, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr)); | |
2346 | ||
2347 | /* Same comments as broadcast apply, and also may not be able to get a sensible | |
2348 | default when using subnet select. User must configure by steam in that case. */ | |
2349 | if (context->router.s_addr && | |
2350 | in_list(req_options, OPTION_ROUTER) && | |
2351 | !option_find2(netid, config_opts, OPTION_ROUTER)) | |
2352 | option_put(mess, end, OPTION_ROUTER, INADDRSZ, ntohl(context->router.s_addr)); | |
2353 | ||
2354 | if (in_list(req_options, OPTION_DNSSERVER) && | |
2355 | !option_find2(netid, config_opts, OPTION_DNSSERVER)) | |
2356 | option_put(mess, end, OPTION_DNSSERVER, INADDRSZ, ntohl(context->local.s_addr)); | |
2357 | } | |
2358 | ||
9009d746 | 2359 | if (domain && in_list(req_options, OPTION_DOMAINNAME) && |
33820b7e | 2360 | !option_find2(netid, config_opts, OPTION_DOMAINNAME)) |
9009d746 | 2361 | option_put_string(mess, end, OPTION_DOMAINNAME, domain, null_term); |
9e4abcb5 | 2362 | |
824af85b | 2363 | /* Note that we ignore attempts to set the fqdn using --dhc-option=81,<name> */ |
3d8df260 SK |
2364 | if (hostname) |
2365 | { | |
824af85b SK |
2366 | if (in_list(req_options, OPTION_HOSTNAME) && |
2367 | !option_find2(netid, config_opts, OPTION_HOSTNAME)) | |
1b7ecd11 | 2368 | option_put_string(mess, end, OPTION_HOSTNAME, hostname, null_term); |
3d8df260 SK |
2369 | |
2370 | if (fqdn_flags != 0) | |
2371 | { | |
73a08a24 SK |
2372 | len = strlen(hostname) + 3; |
2373 | ||
3d8df260 SK |
2374 | if (fqdn_flags & 0x04) |
2375 | len += 2; | |
cdeda28f SK |
2376 | else if (null_term) |
2377 | len++; | |
2378 | ||
9009d746 SK |
2379 | if (domain) |
2380 | len += strlen(domain) + 1; | |
3d8df260 | 2381 | |
1b7ecd11 | 2382 | if ((p = free_space(mess, end, OPTION_CLIENT_FQDN, len))) |
3d8df260 | 2383 | { |
3d8df260 SK |
2384 | *(p++) = fqdn_flags; |
2385 | *(p++) = 255; | |
2386 | *(p++) = 255; | |
2387 | ||
2388 | if (fqdn_flags & 0x04) | |
2389 | { | |
2390 | p = do_rfc1035_name(p, hostname); | |
9009d746 SK |
2391 | if (domain) |
2392 | p = do_rfc1035_name(p, domain); | |
3d8df260 SK |
2393 | *p++ = 0; |
2394 | } | |
2395 | else | |
2396 | { | |
2397 | memcpy(p, hostname, strlen(hostname)); | |
2398 | p += strlen(hostname); | |
9009d746 | 2399 | if (domain) |
3d8df260 SK |
2400 | { |
2401 | *(p++) = '.'; | |
9009d746 SK |
2402 | memcpy(p, domain, strlen(domain)); |
2403 | p += strlen(domain); | |
cdeda28f SK |
2404 | } |
2405 | if (null_term) | |
2406 | *(p++) = 0; | |
3d8df260 SK |
2407 | } |
2408 | } | |
2409 | } | |
2410 | } | |
2411 | ||
6b01084f | 2412 | for (opt = config_opts; opt; opt = opt->next) |
9e4abcb5 | 2413 | { |
824af85b SK |
2414 | int optno = opt->opt; |
2415 | ||
6b01084f | 2416 | /* was it asked for, or are we sending it anyway? */ |
824af85b | 2417 | if (!(opt->flags & DHOPT_FORCE) && !in_list(req_options, optno)) |
6b01084f SK |
2418 | continue; |
2419 | ||
2420 | /* prohibit some used-internally options */ | |
824af85b SK |
2421 | if (optno == OPTION_CLIENT_FQDN || |
2422 | optno == OPTION_MAXMESSAGE || | |
2423 | optno == OPTION_OVERLOAD || | |
2424 | optno == OPTION_PAD || | |
2425 | optno == OPTION_END) | |
2426 | continue; | |
2427 | ||
2428 | if (optno == OPTION_SNAME && done_server) | |
2429 | continue; | |
2430 | ||
2431 | if (optno == OPTION_FILENAME && done_file) | |
6b01084f SK |
2432 | continue; |
2433 | ||
2434 | /* netids match and not encapsulated? */ | |
824af85b | 2435 | if (opt != option_find2(netid, config_opts, optno)) |
33820b7e SK |
2436 | continue; |
2437 | ||
2438 | /* For the options we have default values on | |
2439 | dhc-option=<optionno> means "don't include this option" | |
2440 | not "include a zero-length option" */ | |
2441 | if (opt->len == 0 && | |
824af85b SK |
2442 | (optno == OPTION_NETMASK || |
2443 | optno == OPTION_BROADCAST || | |
2444 | optno == OPTION_ROUTER || | |
2445 | optno == OPTION_DNSSERVER || | |
2446 | optno == OPTION_DOMAINNAME || | |
2447 | optno == OPTION_HOSTNAME)) | |
33820b7e | 2448 | continue; |
7622fc06 SK |
2449 | |
2450 | /* vendor-class comes from elsewhere for PXE */ | |
2451 | if (pxe_arch != -1 && optno == OPTION_VENDOR_ID) | |
2452 | continue; | |
824af85b | 2453 | |
7622fc06 | 2454 | /* always force null-term for filename and servername - buggy PXE again. */ |
73a08a24 | 2455 | len = do_opt(opt, NULL, context, |
824af85b | 2456 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
91dccd09 | 2457 | |
824af85b | 2458 | if ((p = free_space(mess, end, optno, len))) |
6b01084f | 2459 | { |
73a08a24 | 2460 | do_opt(opt, p, context, |
824af85b SK |
2461 | (optno == OPTION_SNAME || optno == OPTION_FILENAME) ? 1 : null_term); |
2462 | ||
6b01084f SK |
2463 | /* If we send a vendor-id, revisit which vendor-ops we consider |
2464 | it appropriate to send. */ | |
824af85b | 2465 | if (optno == OPTION_VENDOR_ID) |
8ef5ada2 SK |
2466 | { |
2467 | match_vendor_opts(p - 2, config_opts); | |
2468 | done_vendor_class = 1; | |
2469 | } | |
6b01084f SK |
2470 | } |
2471 | } | |
91dccd09 | 2472 | |
73a08a24 SK |
2473 | /* Now send options to be encapsulated in arbitrary options, |
2474 | eg dhcp-option=encap:172,17,....... | |
316e2730 SK |
2475 | Also hand vendor-identifying vendor-encapsulated options, |
2476 | dhcp-option = rfc3925-encap:13,17,....... | |
73a08a24 SK |
2477 | The may be more that one "outer" to do, so group |
2478 | all the options which match each outer in turn. */ | |
7622fc06 SK |
2479 | for (opt = config_opts; opt; opt = opt->next) |
2480 | opt->flags &= ~DHOPT_ENCAP_DONE; | |
2481 | ||
73a08a24 | 2482 | for (opt = config_opts; opt; opt = opt->next) |
316e2730 SK |
2483 | { |
2484 | int flags; | |
2485 | ||
2486 | if ((flags = (opt->flags & (DHOPT_ENCAPSULATE | DHOPT_RFC3925)))) | |
2487 | { | |
2488 | int found = 0; | |
2489 | struct dhcp_opt *o; | |
2490 | ||
2491 | if (opt->flags & DHOPT_ENCAP_DONE) | |
2492 | continue; | |
2493 | ||
2494 | for (len = 0, o = config_opts; o; o = o->next) | |
2495 | { | |
2496 | int outer = flags & DHOPT_ENCAPSULATE ? o->u.encap : OPTION_VENDOR_IDENT_OPT; | |
2497 | ||
2498 | o->flags &= ~DHOPT_ENCAP_MATCH; | |
2499 | ||
2500 | if (!(o->flags & flags) || opt->u.encap != o->u.encap) | |
2501 | continue; | |
2502 | ||
2503 | o->flags |= DHOPT_ENCAP_DONE; | |
2504 | if (match_netid(o->netid, netid, 1) && | |
2505 | ((o->flags & DHOPT_FORCE) || in_list(req_options, outer))) | |
2506 | { | |
2507 | o->flags |= DHOPT_ENCAP_MATCH; | |
2508 | found = 1; | |
2509 | len += do_opt(o, NULL, NULL, 0) + 2; | |
2510 | } | |
2511 | } | |
2512 | ||
2513 | if (found) | |
2514 | { | |
2515 | if (flags & DHOPT_ENCAPSULATE) | |
2516 | do_encap_opts(config_opts, opt->u.encap, DHOPT_ENCAP_MATCH, mess, end, null_term); | |
2517 | else if (len > 250) | |
2518 | my_syslog(MS_DHCP | LOG_WARNING, _("cannot send RFC3925 option: too many options for enterprise number %d"), opt->u.encap); | |
2519 | else if ((p = free_space(mess, end, OPTION_VENDOR_IDENT_OPT, len + 5))) | |
2520 | { | |
2521 | int swap_ent = htonl(opt->u.encap); | |
2522 | memcpy(p, &swap_ent, 4); | |
2523 | p += 4; | |
2524 | *(p++) = len; | |
2525 | for (o = config_opts; o; o = o->next) | |
2526 | if (o->flags & DHOPT_ENCAP_MATCH) | |
2527 | { | |
2528 | len = do_opt(o, p + 2, NULL, 0); | |
2529 | *(p++) = o->opt; | |
2530 | *(p++) = len; | |
2531 | p += len; | |
2532 | } | |
2533 | } | |
2534 | } | |
2535 | } | |
2536 | } | |
73a08a24 | 2537 | |
7622fc06 | 2538 | force_encap = prune_vendor_opts(netid); |
8ef5ada2 | 2539 | |
316e2730 | 2540 | if (context && pxe_arch != -1) |
7622fc06 SK |
2541 | { |
2542 | pxe_misc(mess, end, uuid); | |
316e2730 | 2543 | config_opts = pxe_opts(pxe_arch, netid, context->local); |
7622fc06 | 2544 | } |
9e4abcb5 | 2545 | |
8ef5ada2 SK |
2546 | if ((force_encap || in_list(req_options, OPTION_VENDOR_CLASS_OPT)) && |
2547 | do_encap_opts(config_opts, OPTION_VENDOR_CLASS_OPT, DHOPT_VENDOR_MATCH, mess, end, null_term) && | |
2548 | pxe_arch == -1 && !done_vendor_class && vendor_class_len != 0 && | |
2549 | (p = free_space(mess, end, OPTION_VENDOR_ID, vendor_class_len))) | |
2550 | /* If we send vendor encapsulated options, and haven't already sent option 60, | |
2551 | echo back the value we got from the client. */ | |
2552 | memcpy(p, daemon->dhcp_buff3, vendor_class_len); | |
2553 | ||
7622fc06 | 2554 | /* restore BOOTP anti-overload hack */ |
28866e95 | 2555 | if (!req_options || option_bool(OPT_NO_OVERRIDE)) |
1b7ecd11 SK |
2556 | { |
2557 | mess->file[0] = f0; | |
2558 | mess->sname[0] = s0; | |
2559 | } | |
2560 | } | |
9e4abcb5 | 2561 | |
7622fc06 SK |
2562 | #endif |
2563 | ||
2564 | ||
2565 | ||
2566 | ||
2567 | ||
2568 | ||
2569 |