2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
26 #include <net/if_arp.h>
27 #include <netinet/ip.h>
28 #include <sys/ioctl.h>
29 #include <sys/timerfd.h>
30 #include <arpa/inet.h>
36 static void free_dhcpv4_assignment(struct dhcpv4_assignment
*a
);
37 static void handle_dhcpv4(void *addr
, void *data
, size_t len
,
38 struct interface
*iface
, void *dest_addr
);
39 static struct dhcpv4_assignment
* dhcpv4_lease(struct interface
*iface
,
40 enum dhcpv4_msg msg
, const uint8_t *mac
, struct in_addr reqaddr
,
41 uint32_t *leasetime
, const char *hostname
, const size_t hostname_len
);
43 // Create socket and register events
49 int setup_dhcpv4_interface(struct interface
*iface
, bool enable
)
51 if (iface
->dhcpv4_event
.uloop
.fd
> 0) {
52 uloop_fd_delete(&iface
->dhcpv4_event
.uloop
);
53 close(iface
->dhcpv4_event
.uloop
.fd
);
54 iface
->dhcpv4_event
.uloop
.fd
= -1;
57 if (iface
->dhcpv4
&& enable
) {
58 if (!iface
->dhcpv4_assignments
.next
)
59 INIT_LIST_HEAD(&iface
->dhcpv4_assignments
);
61 int sock
= socket(AF_INET
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
63 syslog(LOG_ERR
, "Failed to create DHCPv4 server socket: %s",
68 // Basic IPv6 configuration
70 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
71 setsockopt(sock
, SOL_SOCKET
, SO_BROADCAST
, &val
, sizeof(val
));
72 setsockopt(sock
, IPPROTO_IP
, IP_PKTINFO
, &val
, sizeof(val
));
74 val
= IPTOS_PREC_INTERNETCONTROL
;
75 setsockopt(sock
, IPPROTO_IP
, IP_TOS
, &val
, sizeof(val
));
77 val
= IP_PMTUDISC_DONT
;
78 setsockopt(sock
, IPPROTO_IP
, IP_MTU_DISCOVER
, &val
, sizeof(val
));
80 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
,
81 iface
->ifname
, strlen(iface
->ifname
));
83 struct sockaddr_in bind_addr
= {AF_INET
, htons(DHCPV4_SERVER_PORT
),
86 if (bind(sock
, (struct sockaddr
*)&bind_addr
, sizeof(bind_addr
))) {
87 syslog(LOG_ERR
, "Failed to open DHCPv4 server socket: %s",
93 if (ntohl(iface
->dhcpv4_start
.s_addr
) > ntohl(iface
->dhcpv4_end
.s_addr
)) {
94 syslog(LOG_ERR
, "Invalid DHCP range");
98 // Create a range if not specified
100 strncpy(ifreq
.ifr_name
, iface
->ifname
, sizeof(ifreq
.ifr_name
));
102 struct sockaddr_in
*saddr
= (struct sockaddr_in
*)&ifreq
.ifr_addr
;
103 struct sockaddr_in
*smask
= (struct sockaddr_in
*)&ifreq
.ifr_netmask
;
104 if (!(iface
->dhcpv4_start
.s_addr
& htonl(0xffff0000)) &&
105 !(iface
->dhcpv4_end
.s_addr
& htonl(0xffff0000)) &&
106 !ioctl(sock
, SIOCGIFADDR
, &ifreq
)) {
107 struct in_addr addr
= saddr
->sin_addr
;
109 ioctl(sock
, SIOCGIFNETMASK
, &ifreq
);
110 struct in_addr mask
= smask
->sin_addr
;
112 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
113 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
115 if (start
&& end
&& start
< end
&&
116 start
> ntohl(addr
.s_addr
& ~mask
.s_addr
) &&
117 (start
& ntohl(~mask
.s_addr
)) == start
&&
118 (end
& ntohl(~mask
.s_addr
)) == end
) {
119 iface
->dhcpv4_start
.s_addr
= htonl(start
) |
120 (addr
.s_addr
& mask
.s_addr
);
121 iface
->dhcpv4_end
.s_addr
= htonl(end
) |
122 (addr
.s_addr
& mask
.s_addr
);
123 } else if (ntohl(mask
.s_addr
) <= 0xfffffff0) {
124 start
= addr
.s_addr
& mask
.s_addr
;
125 end
= addr
.s_addr
& mask
.s_addr
;
127 if (ntohl(mask
.s_addr
) <= 0xffffff00) {
128 iface
->dhcpv4_start
.s_addr
= start
| htonl(100);
129 iface
->dhcpv4_end
.s_addr
= end
| htonl(250);
130 } else if (ntohl(mask
.s_addr
) <= 0xffffffc0) {
131 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
132 iface
->dhcpv4_end
.s_addr
= end
| htonl(60);
133 } else if (ntohl(mask
.s_addr
) <= 0xffffffe0) {
134 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
135 iface
->dhcpv4_end
.s_addr
= end
| htonl(30);
137 iface
->dhcpv4_start
.s_addr
= start
| htonl(3);
138 iface
->dhcpv4_end
.s_addr
= end
| htonl(12);
145 // Parse static entries
147 list_for_each_entry(lease
, &leases
, head
) {
149 struct dhcpv4_assignment
*a
= calloc(1, sizeof(*a
));
151 syslog(LOG_ERR
, "Calloc failed for static lease on interface %s",
155 if (lease
->dhcpv4_leasetime
>= 60)
156 a
->leasetime
= lease
->dhcpv4_leasetime
;
158 a
->addr
= ntohl(lease
->ipaddr
.s_addr
);
159 memcpy(a
->hwaddr
, lease
->mac
.ether_addr_octet
, sizeof(a
->hwaddr
));
160 /* Static assignment */
161 a
->flags
|= OAF_STATIC
;
165 // Assign to all interfaces
166 struct dhcpv4_assignment
*c
;
167 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
168 if (c
->addr
> a
->addr
) {
169 list_add_tail(&a
->head
, &c
->head
);
171 } else if (c
->addr
== a
->addr
) {
172 // Already an assignment with that number
176 if (&c
->head
== &iface
->dhcpv4_assignments
) {
177 list_add(&a
->head
, &iface
->dhcpv4_assignments
);
181 if (lease
->hostname
[0]) {
183 a
->hostname
= strdup(lease
->hostname
);
186 free_dhcpv4_assignment(a
);
189 // Clean invalid assignments
190 struct dhcpv4_assignment
*a
, *n
;
191 list_for_each_entry_safe(a
, n
, &iface
->dhcpv4_assignments
, head
) {
192 if ((htonl(a
->addr
) & smask
->sin_addr
.s_addr
) !=
193 (iface
->dhcpv4_start
.s_addr
& smask
->sin_addr
.s_addr
))
194 free_dhcpv4_assignment(a
);
198 if (iface
->dhcpv4_leasetime
< 60)
199 iface
->dhcpv4_leasetime
= 43200;
201 iface
->dhcpv4_event
.uloop
.fd
= sock
;
202 iface
->dhcpv4_event
.handle_dgram
= handle_dhcpv4
;
203 odhcpd_register(&iface
->dhcpv4_event
);
204 } else if (iface
->dhcpv4_assignments
.next
) {
205 while (!list_empty(&iface
->dhcpv4_assignments
))
206 free_dhcpv4_assignment(list_first_entry(&iface
->dhcpv4_assignments
,
207 struct dhcpv4_assignment
, head
));
212 static char *dhcpv4_msg_to_string(uint8_t reqmsg
)
215 case (DHCPV4_MSG_DISCOVER
):
216 return "DHCPV4_MSG_DISCOVER";
217 case (DHCPV4_MSG_OFFER
):
218 return "DHCPV4_MSG_OFFER";
219 case (DHCPV4_MSG_REQUEST
):
220 return "DHCPV4_MSG_REQUEST";
221 case (DHCPV4_MSG_DECLINE
):
222 return "DHCPV4_MSG_DECLINE";
223 case (DHCPV4_MSG_ACK
):
224 return "DHCPV4_MSG_ACK";
225 case (DHCPV4_MSG_NAK
):
226 return "DHCPV4_MSG_NAK";
227 case (DHCPV4_MSG_RELEASE
):
228 return "DHCPV4_MSG_RELEASE";
229 case (DHCPV4_MSG_INFORM
):
230 return "DHCPV4_MSG_INFORM";
236 static void free_dhcpv4_assignment(struct dhcpv4_assignment
*a
)
245 static void dhcpv4_put(struct dhcpv4_message
*msg
, uint8_t **cookie
,
246 uint8_t type
, uint8_t len
, const void *data
)
248 uint8_t *c
= *cookie
;
249 if (*cookie
+ 2 + len
> (uint8_t*)&msg
[1])
254 memcpy(c
, data
, len
);
259 // Handler for DHCPv4 messages
260 static void handle_dhcpv4(void *addr
, void *data
, size_t len
,
261 struct interface
*iface
, _unused
void *dest_addr
)
266 struct dhcpv4_message
*req
= data
;
267 if (len
< offsetof(struct dhcpv4_message
, options
) + 4 ||
268 req
->op
!= DHCPV4_BOOTREQUEST
|| req
->hlen
!= 6)
271 int sock
= iface
->dhcpv4_event
.uloop
.fd
;
272 struct sockaddr_in ifaddr
;
273 struct sockaddr_in ifnetmask
;
275 syslog(LOG_NOTICE
, "Got DHCPv4 request");
278 memcpy(ifreq
.ifr_name
, iface
->ifname
, sizeof(ifreq
.ifr_name
));
279 if (ioctl(sock
, SIOCGIFADDR
, &ifreq
)) {
280 syslog(LOG_WARNING
, "DHCPv4 failed to detect address: %s", strerror(errno
));
284 memcpy(&ifaddr
, &ifreq
.ifr_addr
, sizeof(ifaddr
));
285 if (ioctl(sock
, SIOCGIFNETMASK
, &ifreq
))
288 memcpy(&ifnetmask
, &ifreq
.ifr_netmask
, sizeof(ifnetmask
));
289 uint32_t network
= ifaddr
.sin_addr
.s_addr
& ifnetmask
.sin_addr
.s_addr
;
291 if ((iface
->dhcpv4_start
.s_addr
& ifnetmask
.sin_addr
.s_addr
) != network
||
292 (iface
->dhcpv4_end
.s_addr
& ifnetmask
.sin_addr
.s_addr
) != network
) {
293 syslog(LOG_WARNING
, "DHCPv4 range out of assigned network");
297 struct ifreq ifr
= {.ifr_name
= ""};
298 strncpy(ifr
.ifr_name
, iface
->ifname
, sizeof(ifr
.ifr_name
));
300 struct dhcpv4_message reply
= {
301 .op
= DHCPV4_BOOTREPLY
,
308 .ciaddr
= {INADDR_ANY
},
309 .giaddr
= req
->giaddr
,
310 .siaddr
= ifaddr
.sin_addr
,
312 memcpy(reply
.chaddr
, req
->chaddr
, sizeof(reply
.chaddr
));
314 reply
.options
[0] = 0x63;
315 reply
.options
[1] = 0x82;
316 reply
.options
[2] = 0x53;
317 reply
.options
[3] = 0x63;
319 uint8_t *cookie
= &reply
.options
[4];
320 uint8_t reqmsg
= DHCPV4_MSG_REQUEST
;
321 uint8_t msg
= DHCPV4_MSG_ACK
;
323 struct in_addr reqaddr
= {INADDR_ANY
};
324 uint32_t leasetime
= 0;
325 size_t hostname_len
= 0;
328 uint8_t *start
= &req
->options
[4];
329 uint8_t *end
= ((uint8_t*)data
) + len
;
330 struct dhcpv4_option
*opt
;
331 dhcpv4_for_each_option(start
, end
, opt
) {
332 if (opt
->type
== DHCPV4_OPT_MESSAGE
&& opt
->len
== 1) {
333 reqmsg
= opt
->data
[0];
334 } else if (opt
->type
== DHCPV4_OPT_HOSTNAME
&& opt
->len
> 0) {
335 hostname_len
= opt
->len
;
336 memcpy(hostname
, opt
->data
, hostname_len
);
337 hostname
[hostname_len
] = 0;
338 } else if (opt
->type
== DHCPV4_OPT_IPADDRESS
&& opt
->len
== 4) {
339 memcpy(&reqaddr
, opt
->data
, 4);
340 } else if (opt
->type
== DHCPV4_OPT_SERVERID
&& opt
->len
== 4) {
341 if (memcmp(opt
->data
, &ifaddr
.sin_addr
, 4))
343 } else if (iface
->filter_class
&& opt
->type
== DHCPV4_OPT_USER_CLASS
) {
344 uint8_t *c
= opt
->data
, *cend
= &opt
->data
[opt
->len
];
345 for (; c
< cend
&& &c
[*c
] < cend
; c
= &c
[1 + *c
]) {
346 size_t elen
= strlen(iface
->filter_class
);
347 if (*c
== elen
&& !memcmp(&c
[1], iface
->filter_class
, elen
))
348 return; // Ignore from homenet
350 } else if (opt
->type
== DHCPV4_OPT_LEASETIME
&& opt
->len
== 4)
351 memcpy(&leasetime
, opt
->data
, 4);
354 if (reqmsg
!= DHCPV4_MSG_DISCOVER
&& reqmsg
!= DHCPV4_MSG_REQUEST
&&
355 reqmsg
!= DHCPV4_MSG_INFORM
&& reqmsg
!= DHCPV4_MSG_DECLINE
&&
356 reqmsg
!= DHCPV4_MSG_RELEASE
)
359 struct dhcpv4_assignment
*lease
= NULL
;
360 if (reqmsg
!= DHCPV4_MSG_INFORM
)
361 lease
= dhcpv4_lease(iface
, reqmsg
, req
->chaddr
, reqaddr
,
362 &leasetime
, hostname
, hostname_len
);
365 if (reqmsg
== DHCPV4_MSG_REQUEST
)
366 msg
= DHCPV4_MSG_NAK
;
367 else if (reqmsg
== DHCPV4_MSG_DISCOVER
)
369 } else if (reqmsg
== DHCPV4_MSG_DISCOVER
) {
370 msg
= DHCPV4_MSG_OFFER
;
371 } else if (reqmsg
== DHCPV4_MSG_REQUEST
&& reqaddr
.s_addr
&&
372 reqaddr
.s_addr
!= htonl(lease
->addr
)) {
373 msg
= DHCPV4_MSG_NAK
;
375 * DHCP client requested an IP which we can't offer to him. Probably the
376 * client changed the network. The reply type is set to DHCPV4_MSG_NAK,
377 * because the client should not use that IP.
379 * For modern devices we build an answer that includes a valid IP, like
380 * a DHCPV4_MSG_ACK. The client will use that IP and doesn't need to
381 * perform additional DHCP round trips.
386 syslog(LOG_WARNING
, "received %s from %x:%x:%x:%x:%x:%x",
387 dhcpv4_msg_to_string(reqmsg
),
388 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
389 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5]);
391 if (reqmsg
== DHCPV4_MSG_DECLINE
|| reqmsg
== DHCPV4_MSG_RELEASE
)
394 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MESSAGE
, 1, &msg
);
395 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SERVERID
, 4, &ifaddr
.sin_addr
);
400 reply
.yiaddr
.s_addr
= htonl(lease
->addr
);
402 val
= htonl(leasetime
);
403 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_LEASETIME
, 4, &val
);
405 if (leasetime
!= UINT32_MAX
) {
406 val
= htonl(500 * leasetime
/ 1000);
407 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_RENEW
, 4, &val
);
409 val
= htonl(875 * leasetime
/ 1000);
410 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_REBIND
, 4, &val
);
413 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_NETMASK
, 4, &ifnetmask
.sin_addr
);
416 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_HOSTNAME
,
417 strlen(lease
->hostname
), lease
->hostname
);
419 if (!ioctl(sock
, SIOCGIFBRDADDR
, &ifr
)) {
420 struct sockaddr_in
*ina
= (struct sockaddr_in
*)&ifr
.ifr_broadaddr
;
421 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_BROADCAST
, 4, &ina
->sin_addr
);
425 if (!ioctl(sock
, SIOCGIFMTU
, &ifr
)) {
426 uint16_t mtu
= htons(ifr
.ifr_mtu
);
427 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MTU
, 2, &mtu
);
430 if (iface
->search
&& iface
->search_len
<= 255) {
431 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
432 iface
->search_len
, iface
->search
);
433 } else if (!res_init() && _res
.dnsrch
[0] && _res
.dnsrch
[0][0]) {
434 uint8_t search_buf
[256];
435 int len
= dn_comp(_res
.dnsrch
[0], search_buf
,
436 sizeof(search_buf
), NULL
, NULL
);
438 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
442 if (iface
->dhcpv4_router_cnt
== 0)
443 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
, 4, &ifaddr
.sin_addr
);
445 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
,
446 4 * iface
->dhcpv4_router_cnt
, iface
->dhcpv4_router
);
449 if (iface
->dhcpv4_dns_cnt
== 0)
450 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
, 4, &ifaddr
.sin_addr
);
452 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
,
453 4 * iface
->dhcpv4_dns_cnt
, iface
->dhcpv4_dns
);
456 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_END
, 0, NULL
);
458 struct sockaddr_in dest
= *((struct sockaddr_in
*)addr
);
459 if (req
->giaddr
.s_addr
) {
461 * relay agent is configured, send reply to the agent
463 dest
.sin_addr
= req
->giaddr
;
464 dest
.sin_port
= htons(DHCPV4_SERVER_PORT
);
465 } else if (req
->ciaddr
.s_addr
&& req
->ciaddr
.s_addr
!= dest
.sin_addr
.s_addr
) {
467 * client has existing configuration (ciaddr is set) AND this address is
468 * not the address it used for the dhcp message
470 dest
.sin_addr
= req
->ciaddr
;
471 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
472 } else if ((ntohs(req
->flags
) & DHCPV4_FLAG_BROADCAST
) ||
473 req
->hlen
!= reply
.hlen
|| !reply
.yiaddr
.s_addr
) {
475 * client requests a broadcast reply OR we can't offer an IP
477 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
478 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
479 } else if (!req
->ciaddr
.s_addr
&& msg
== DHCPV4_MSG_NAK
) {
481 * client has no previous configuration -> no IP, so we need to reply
482 * with a broadcast packet
484 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
485 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
488 * send reply to the newly (in this proccess) allocated IP
490 dest
.sin_addr
= reply
.yiaddr
;
491 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
493 struct arpreq arp
= {.arp_flags
= ATF_COM
};
494 memcpy(arp
.arp_ha
.sa_data
, req
->chaddr
, 6);
495 memcpy(&arp
.arp_pa
, &dest
, sizeof(arp
.arp_pa
));
496 memcpy(arp
.arp_dev
, iface
->ifname
, sizeof(arp
.arp_dev
));
497 ioctl(sock
, SIOCSARP
, &arp
);
500 if (dest
.sin_addr
.s_addr
== INADDR_BROADCAST
) {
502 * reply goes to IP broadcast -> MAC broadcast
504 syslog(LOG_WARNING
, "sending %s to ff:ff:ff:ff:ff:ff - %s",
505 dhcpv4_msg_to_string(msg
),
506 inet_ntoa(dest
.sin_addr
));
509 * reply is send directly to IP,
510 * MAC is assumed to be the same as the request
512 syslog(LOG_WARNING
, "sending %s to %x:%x:%x:%x:%x:%x - %s",
513 dhcpv4_msg_to_string(msg
),
514 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
515 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5],
516 inet_ntoa(dest
.sin_addr
));
519 sendto(sock
, &reply
, sizeof(reply
), MSG_DONTWAIT
,
520 (struct sockaddr
*)&dest
, sizeof(dest
));
523 static bool dhcpv4_test(struct interface
*iface
, uint32_t try)
525 struct dhcpv4_assignment
*c
;
526 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
527 if (c
->addr
== try) {
534 static bool dhcpv4_assign(struct interface
*iface
,
535 struct dhcpv4_assignment
*assign
, uint32_t raddr
)
537 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
538 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
539 uint32_t count
= end
- start
+ 1;
541 // try to assign the IP the client asked for
542 if (start
<= raddr
&& raddr
<= end
&& dhcpv4_test(iface
, raddr
)) {
543 assign
->addr
= raddr
;
544 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
545 syslog(LOG_DEBUG
, "assigning the IP the client asked for: %u.%u.%u.%u",
546 (assign
->addr
& 0xff000000) >> 24,
547 (assign
->addr
& 0x00ff0000) >> 16,
548 (assign
->addr
& 0x0000ff00) >> 8,
549 (assign
->addr
& 0x000000ff));
553 // Seed RNG with checksum of hwaddress
555 for (size_t i
= 0; i
< sizeof(assign
->hwaddr
); ++i
) {
556 // Knuth's multiplicative method
557 uint8_t o
= assign
->hwaddr
[i
];
558 seed
+= (o
*2654435761) % UINT32_MAX
;
562 uint32_t try = (((uint32_t)rand()) % count
) + start
;
564 if (list_empty(&iface
->dhcpv4_assignments
)) {
566 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
567 syslog(LOG_DEBUG
, "assigning mapped IP (empty list): %u.%u.%u.%u",
568 (assign
->addr
& 0xff000000) >> 24,
569 (assign
->addr
& 0x00ff0000) >> 16,
570 (assign
->addr
& 0x0000ff00) >> 8,
571 (assign
->addr
& 0x000000ff));
575 for (uint32_t i
= 0; i
< count
; ++i
) {
576 if (dhcpv4_test(iface
, try)) {
577 /* test was successful: IP address is not assigned, assign it */
579 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
580 syslog(LOG_DEBUG
, "assigning mapped IP: %u.%u.%u.%u (try %u of %u)",
581 (assign
->addr
& 0xff000000) >> 24,
582 (assign
->addr
& 0x00ff0000) >> 16,
583 (assign
->addr
& 0x0000ff00) >> 8,
584 (assign
->addr
& 0x000000ff), i
, count
);
587 try = (((try - start
) + 1) % count
) + start
;
590 syslog(LOG_DEBUG
, "can't assign any IP address -> address space is full");
595 static struct dhcpv4_assignment
* dhcpv4_lease(struct interface
*iface
,
596 enum dhcpv4_msg msg
, const uint8_t *mac
, struct in_addr reqaddr
,
597 uint32_t *leasetime
, const char *hostname
, const size_t hostname_len
)
599 struct dhcpv4_assignment
*lease
= NULL
;
600 uint32_t raddr
= ntohl(reqaddr
.s_addr
);
601 time_t now
= odhcpd_time();
603 struct dhcpv4_assignment
*c
, *n
, *a
= NULL
;
604 list_for_each_entry_safe(c
, n
, &iface
->dhcpv4_assignments
, head
) {
605 if (!memcmp(c
->hwaddr
, mac
, 6)) {
607 if (c
->addr
== raddr
)
609 } else if (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
< now
)
610 free_dhcpv4_assignment(c
);
613 if (msg
== DHCPV4_MSG_DISCOVER
|| msg
== DHCPV4_MSG_REQUEST
) {
615 uint32_t my_leasetime
;
617 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
618 a
= calloc(1, sizeof(*a
));
620 syslog(LOG_ERR
, "Failed to calloc binding on interface %s", iface
->ifname
);
623 memcpy(a
->hwaddr
, mac
, sizeof(a
->hwaddr
));
624 // Don't consider new assignment as infinite
625 a
->valid_until
= now
;
627 assigned
= dhcpv4_assign(iface
, a
, raddr
);
630 if (a
->leasetime
>= 60) {
631 my_leasetime
= a
->leasetime
;
633 my_leasetime
= iface
->dhcpv4_leasetime
;
636 if ((*leasetime
== 0) || (my_leasetime
< *leasetime
))
637 *leasetime
= my_leasetime
;
640 if (msg
== DHCPV4_MSG_DISCOVER
) {
641 a
->flags
&= ~OAF_BOUND
;
643 if (!(a
->flags
& OAF_STATIC
))
644 a
->valid_until
= now
;
646 if (hostname_len
> 0) {
647 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
649 memcpy(a
->hostname
, hostname
, hostname_len
);
650 a
->hostname
[hostname_len
] = 0;
654 a
->flags
|= OAF_BOUND
;
656 if (!(a
->flags
& OAF_STATIC
))
657 a
->valid_until
= ((*leasetime
== UINT32_MAX
) ? 0 : (time_t)(now
+ *leasetime
));
659 } else if (!assigned
&& a
) { // Cleanup failed assignment
660 free_dhcpv4_assignment(a
);
666 } else if (msg
== DHCPV4_MSG_RELEASE
&& a
) {
667 a
->flags
&= ~OAF_BOUND
;
669 if (!(a
->flags
& OAF_STATIC
))
670 a
->valid_until
= now
- 1;
672 } else if (msg
== DHCPV4_MSG_DECLINE
&& a
) {
673 a
->flags
&= ~OAF_BOUND
;
675 if (!(a
->flags
& OAF_STATIC
)) {
676 memset(a
->hwaddr
, 0, sizeof(a
->hwaddr
));
677 a
->valid_until
= now
+ 3600; // Block address for 1h
681 dhcpv6_write_statefile();