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 IPv4 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 uint32_t mask
= iface
->addr4
[0].prefix
? htonl(~((1 << (32 - iface
->addr4
[0].prefix
)) - 1)) : 0;
100 /* Create a range if not specified */
101 if (!(iface
->dhcpv4_start
.s_addr
& htonl(0xffff0000)) &&
102 !(iface
->dhcpv4_end
.s_addr
& htonl(0xffff0000)) &&
104 struct in_addr
*addr
= &iface
->addr4
[0].addr
.in
;
106 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
107 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
109 if (start
&& end
&& start
< end
&&
110 start
> ntohl(addr
->s_addr
& ~mask
) &&
111 (start
& ntohl(~mask
)) == start
&&
112 (end
& ntohl(~mask
)) == end
) {
113 iface
->dhcpv4_start
.s_addr
= htonl(start
) |
114 (addr
->s_addr
& mask
);
115 iface
->dhcpv4_end
.s_addr
= htonl(end
) |
116 (addr
->s_addr
& mask
);
117 } else if (ntohl(mask
) <= 0xfffffff0) {
118 start
= addr
->s_addr
& mask
;
119 end
= addr
->s_addr
& mask
;
121 if (ntohl(mask
) <= 0xffffff00) {
122 iface
->dhcpv4_start
.s_addr
= start
| htonl(100);
123 iface
->dhcpv4_end
.s_addr
= end
| htonl(250);
124 } else if (ntohl(mask
) <= 0xffffffc0) {
125 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
126 iface
->dhcpv4_end
.s_addr
= end
| htonl(60);
127 } else if (ntohl(mask
) <= 0xffffffe0) {
128 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
129 iface
->dhcpv4_end
.s_addr
= end
| htonl(30);
131 iface
->dhcpv4_start
.s_addr
= start
| htonl(3);
132 iface
->dhcpv4_end
.s_addr
= end
| htonl(12);
137 /* Parse static entries */
139 list_for_each_entry(lease
, &leases
, head
) {
140 /* Construct entry */
141 struct dhcpv4_assignment
*a
= calloc(1, sizeof(*a
));
143 syslog(LOG_ERR
, "Calloc failed for static lease on interface %s",
148 a
->leasetime
= lease
->dhcpv4_leasetime
;
150 a
->addr
= ntohl(lease
->ipaddr
.s_addr
);
151 memcpy(a
->hwaddr
, lease
->mac
.ether_addr_octet
, sizeof(a
->hwaddr
));
152 /* Static assignment */
153 a
->flags
|= OAF_STATIC
;
157 /* Assign to all interfaces */
158 struct dhcpv4_assignment
*c
;
159 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
160 if (c
->addr
> a
->addr
) {
161 list_add_tail(&a
->head
, &c
->head
);
163 } else if (c
->addr
== a
->addr
)
164 /* Already an assignment with that number */
168 if (&c
->head
== &iface
->dhcpv4_assignments
)
169 list_add(&a
->head
, &iface
->dhcpv4_assignments
);
172 if (lease
->hostname
[0]) {
174 a
->hostname
= strdup(lease
->hostname
);
177 free_dhcpv4_assignment(a
);
180 // Clean invalid assignments
181 struct dhcpv4_assignment
*a
, *n
;
182 list_for_each_entry_safe(a
, n
, &iface
->dhcpv4_assignments
, head
) {
183 if ((htonl(a
->addr
) & mask
) !=
184 (iface
->dhcpv4_start
.s_addr
& mask
))
185 free_dhcpv4_assignment(a
);
188 iface
->dhcpv4_event
.uloop
.fd
= sock
;
189 iface
->dhcpv4_event
.handle_dgram
= handle_dhcpv4
;
190 odhcpd_register(&iface
->dhcpv4_event
);
191 } else if (iface
->dhcpv4_assignments
.next
) {
192 while (!list_empty(&iface
->dhcpv4_assignments
))
193 free_dhcpv4_assignment(list_first_entry(&iface
->dhcpv4_assignments
,
194 struct dhcpv4_assignment
, head
));
199 static char *dhcpv4_msg_to_string(uint8_t reqmsg
)
202 case (DHCPV4_MSG_DISCOVER
):
203 return "DHCPV4_MSG_DISCOVER";
204 case (DHCPV4_MSG_OFFER
):
205 return "DHCPV4_MSG_OFFER";
206 case (DHCPV4_MSG_REQUEST
):
207 return "DHCPV4_MSG_REQUEST";
208 case (DHCPV4_MSG_DECLINE
):
209 return "DHCPV4_MSG_DECLINE";
210 case (DHCPV4_MSG_ACK
):
211 return "DHCPV4_MSG_ACK";
212 case (DHCPV4_MSG_NAK
):
213 return "DHCPV4_MSG_NAK";
214 case (DHCPV4_MSG_RELEASE
):
215 return "DHCPV4_MSG_RELEASE";
216 case (DHCPV4_MSG_INFORM
):
217 return "DHCPV4_MSG_INFORM";
223 static void free_dhcpv4_assignment(struct dhcpv4_assignment
*a
)
232 static void dhcpv4_put(struct dhcpv4_message
*msg
, uint8_t **cookie
,
233 uint8_t type
, uint8_t len
, const void *data
)
235 uint8_t *c
= *cookie
;
236 if (*cookie
+ 2 + len
> (uint8_t*)&msg
[1])
241 memcpy(c
, data
, len
);
246 // Handler for DHCPv4 messages
247 static void handle_dhcpv4(void *addr
, void *data
, size_t len
,
248 struct interface
*iface
, _unused
void *dest_addr
)
253 struct dhcpv4_message
*req
= data
;
254 if (len
< offsetof(struct dhcpv4_message
, options
) + 4 ||
255 req
->op
!= DHCPV4_BOOTREQUEST
|| req
->hlen
!= 6)
259 syslog(LOG_NOTICE
, "Got DHCPv4 request");
261 if (!iface
->addr4_len
) {
262 syslog(LOG_WARNING
, "DHCPv4 no address found on %s", iface
->name
);
266 struct in_addr
*ifaddr
= &iface
->addr4
[0].addr
.in
;
267 struct in_addr
*ifbroadcast
= &iface
->addr4
[0].broadcast
;
268 uint32_t mask
= iface
->addr4
[0].prefix
? htonl(~((1 << (32 - iface
->addr4
[0].prefix
)) - 1)) : 0;
269 uint32_t network
= iface
->addr4
[0].addr
.in
.s_addr
& mask
;
270 int sock
= iface
->dhcpv4_event
.uloop
.fd
;
272 if ((iface
->dhcpv4_start
.s_addr
& mask
) != network
||
273 (iface
->dhcpv4_end
.s_addr
& mask
) != network
) {
274 syslog(LOG_WARNING
, "DHCPv4 range out of assigned network");
278 struct dhcpv4_message reply
= {
279 .op
= DHCPV4_BOOTREPLY
,
286 .ciaddr
= {INADDR_ANY
},
287 .giaddr
= req
->giaddr
,
290 memcpy(reply
.chaddr
, req
->chaddr
, sizeof(reply
.chaddr
));
292 reply
.options
[0] = 0x63;
293 reply
.options
[1] = 0x82;
294 reply
.options
[2] = 0x53;
295 reply
.options
[3] = 0x63;
297 uint8_t *cookie
= &reply
.options
[4];
298 uint8_t reqmsg
= DHCPV4_MSG_REQUEST
;
299 uint8_t msg
= DHCPV4_MSG_ACK
;
301 struct in_addr reqaddr
= {INADDR_ANY
};
302 uint32_t leasetime
= 0;
303 size_t hostname_len
= 0;
306 uint8_t *start
= &req
->options
[4];
307 uint8_t *end
= ((uint8_t*)data
) + len
;
308 struct dhcpv4_option
*opt
;
309 dhcpv4_for_each_option(start
, end
, opt
) {
310 if (opt
->type
== DHCPV4_OPT_MESSAGE
&& opt
->len
== 1)
311 reqmsg
= opt
->data
[0];
312 else if (opt
->type
== DHCPV4_OPT_HOSTNAME
&& opt
->len
> 0) {
313 hostname_len
= opt
->len
;
314 memcpy(hostname
, opt
->data
, hostname_len
);
315 hostname
[hostname_len
] = 0;
316 } else if (opt
->type
== DHCPV4_OPT_IPADDRESS
&& opt
->len
== 4)
317 memcpy(&reqaddr
, opt
->data
, 4);
318 else if (opt
->type
== DHCPV4_OPT_SERVERID
&& opt
->len
== 4) {
319 if (memcmp(opt
->data
, ifaddr
, 4))
321 } else if (iface
->filter_class
&& opt
->type
== DHCPV4_OPT_USER_CLASS
) {
322 uint8_t *c
= opt
->data
, *cend
= &opt
->data
[opt
->len
];
323 for (; c
< cend
&& &c
[*c
] < cend
; c
= &c
[1 + *c
]) {
324 size_t elen
= strlen(iface
->filter_class
);
325 if (*c
== elen
&& !memcmp(&c
[1], iface
->filter_class
, elen
))
326 return; // Ignore from homenet
328 } else if (opt
->type
== DHCPV4_OPT_LEASETIME
&& opt
->len
== 4)
329 memcpy(&leasetime
, opt
->data
, 4);
332 if (reqmsg
!= DHCPV4_MSG_DISCOVER
&& reqmsg
!= DHCPV4_MSG_REQUEST
&&
333 reqmsg
!= DHCPV4_MSG_INFORM
&& reqmsg
!= DHCPV4_MSG_DECLINE
&&
334 reqmsg
!= DHCPV4_MSG_RELEASE
)
337 struct dhcpv4_assignment
*lease
= NULL
;
338 if (reqmsg
!= DHCPV4_MSG_INFORM
)
339 lease
= dhcpv4_lease(iface
, reqmsg
, req
->chaddr
, reqaddr
,
340 &leasetime
, hostname
, hostname_len
);
343 if (reqmsg
== DHCPV4_MSG_REQUEST
)
344 msg
= DHCPV4_MSG_NAK
;
345 else if (reqmsg
== DHCPV4_MSG_DISCOVER
)
347 } else if (reqmsg
== DHCPV4_MSG_DISCOVER
)
348 msg
= DHCPV4_MSG_OFFER
;
349 else if (reqmsg
== DHCPV4_MSG_REQUEST
&& reqaddr
.s_addr
&&
350 reqaddr
.s_addr
!= htonl(lease
->addr
)) {
351 msg
= DHCPV4_MSG_NAK
;
353 * DHCP client requested an IP which we can't offer to him. Probably the
354 * client changed the network. The reply type is set to DHCPV4_MSG_NAK,
355 * because the client should not use that IP.
357 * For modern devices we build an answer that includes a valid IP, like
358 * a DHCPV4_MSG_ACK. The client will use that IP and doesn't need to
359 * perform additional DHCP round trips.
364 syslog(LOG_WARNING
, "received %s from %02x:%02x:%02x:%02x:%02x:%02x",
365 dhcpv4_msg_to_string(reqmsg
),
366 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
367 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5]);
369 if (reqmsg
== DHCPV4_MSG_DECLINE
|| reqmsg
== DHCPV4_MSG_RELEASE
)
372 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MESSAGE
, 1, &msg
);
373 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SERVERID
, 4, ifaddr
);
378 reply
.yiaddr
.s_addr
= htonl(lease
->addr
);
380 val
= htonl(leasetime
);
381 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_LEASETIME
, 4, &val
);
383 if (leasetime
!= UINT32_MAX
) {
384 val
= htonl(500 * leasetime
/ 1000);
385 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_RENEW
, 4, &val
);
387 val
= htonl(875 * leasetime
/ 1000);
388 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_REBIND
, 4, &val
);
391 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_NETMASK
, 4, &mask
);
394 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_HOSTNAME
,
395 strlen(lease
->hostname
), lease
->hostname
);
397 if (ifbroadcast
->s_addr
!= INADDR_ANY
)
398 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_BROADCAST
, 4, ifbroadcast
);
401 struct ifreq ifr
= {.ifr_name
= ""};
402 strncpy(ifr
.ifr_name
, iface
->ifname
, sizeof(ifr
.ifr_name
));
404 if (!ioctl(sock
, SIOCGIFMTU
, &ifr
)) {
405 uint16_t mtu
= htons(ifr
.ifr_mtu
);
406 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MTU
, 2, &mtu
);
409 if (iface
->search
&& iface
->search_len
<= 255)
410 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
411 iface
->search_len
, iface
->search
);
412 else if (!res_init() && _res
.dnsrch
[0] && _res
.dnsrch
[0][0]) {
413 uint8_t search_buf
[256];
414 int len
= dn_comp(_res
.dnsrch
[0], search_buf
,
415 sizeof(search_buf
), NULL
, NULL
);
417 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
421 if (iface
->dhcpv4_router_cnt
== 0)
422 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
, 4, ifaddr
);
424 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
,
425 4 * iface
->dhcpv4_router_cnt
, iface
->dhcpv4_router
);
428 if (iface
->dhcpv4_dns_cnt
== 0)
429 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
, 4, ifaddr
);
431 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
,
432 4 * iface
->dhcpv4_dns_cnt
, iface
->dhcpv4_dns
);
435 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_END
, 0, NULL
);
437 struct sockaddr_in dest
= *((struct sockaddr_in
*)addr
);
438 if (req
->giaddr
.s_addr
) {
440 * relay agent is configured, send reply to the agent
442 dest
.sin_addr
= req
->giaddr
;
443 dest
.sin_port
= htons(DHCPV4_SERVER_PORT
);
444 } else if (req
->ciaddr
.s_addr
&& req
->ciaddr
.s_addr
!= dest
.sin_addr
.s_addr
) {
446 * client has existing configuration (ciaddr is set) AND this address is
447 * not the address it used for the dhcp message
449 dest
.sin_addr
= req
->ciaddr
;
450 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
451 } else if ((ntohs(req
->flags
) & DHCPV4_FLAG_BROADCAST
) ||
452 req
->hlen
!= reply
.hlen
|| !reply
.yiaddr
.s_addr
) {
454 * client requests a broadcast reply OR we can't offer an IP
456 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
457 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
458 } else if (!req
->ciaddr
.s_addr
&& msg
== DHCPV4_MSG_NAK
) {
460 * client has no previous configuration -> no IP, so we need to reply
461 * with a broadcast packet
463 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
464 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
467 * send reply to the newly (in this proccess) allocated IP
469 dest
.sin_addr
= reply
.yiaddr
;
470 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
472 struct arpreq arp
= {.arp_flags
= ATF_COM
};
473 memcpy(arp
.arp_ha
.sa_data
, req
->chaddr
, 6);
474 memcpy(&arp
.arp_pa
, &dest
, sizeof(arp
.arp_pa
));
475 memcpy(arp
.arp_dev
, iface
->ifname
, sizeof(arp
.arp_dev
));
476 ioctl(sock
, SIOCSARP
, &arp
);
479 if (dest
.sin_addr
.s_addr
== INADDR_BROADCAST
)
480 /* reply goes to IP broadcast -> MAC broadcast */
481 syslog(LOG_WARNING
, "sending %s to ff:ff:ff:ff:ff:ff - %s",
482 dhcpv4_msg_to_string(msg
),
483 inet_ntoa(dest
.sin_addr
));
486 * reply is send directly to IP,
487 * MAC is assumed to be the same as the request
489 syslog(LOG_WARNING
, "sending %s to %02x:%02x:%02x:%02x:%02x:%02x - %s",
490 dhcpv4_msg_to_string(msg
),
491 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
492 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5],
493 inet_ntoa(dest
.sin_addr
));
495 sendto(sock
, &reply
, sizeof(reply
), MSG_DONTWAIT
,
496 (struct sockaddr
*)&dest
, sizeof(dest
));
499 static bool dhcpv4_test(struct interface
*iface
, uint32_t try)
501 struct dhcpv4_assignment
*c
;
502 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
511 static bool dhcpv4_assign(struct interface
*iface
,
512 struct dhcpv4_assignment
*assign
, uint32_t raddr
)
514 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
515 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
516 uint32_t count
= end
- start
+ 1;
518 // try to assign the IP the client asked for
519 if (start
<= raddr
&& raddr
<= end
&& dhcpv4_test(iface
, raddr
)) {
520 assign
->addr
= raddr
;
521 syslog(LOG_INFO
, "assigning the IP the client asked for: %u.%u.%u.%u",
522 (assign
->addr
& 0xff000000) >> 24,
523 (assign
->addr
& 0x00ff0000) >> 16,
524 (assign
->addr
& 0x0000ff00) >> 8,
525 (assign
->addr
& 0x000000ff));
529 // Seed RNG with checksum of hwaddress
531 for (size_t i
= 0; i
< sizeof(assign
->hwaddr
); ++i
) {
532 // Knuth's multiplicative method
533 uint8_t o
= assign
->hwaddr
[i
];
534 seed
+= (o
*2654435761) % UINT32_MAX
;
539 uint32_t try = (((uint32_t)rand()) % count
) + start
;
541 if (list_empty(&iface
->dhcpv4_assignments
)) {
543 syslog(LOG_INFO
, "assigning mapped IP (empty list): %u.%u.%u.%u",
544 (assign
->addr
& 0xff000000) >> 24,
545 (assign
->addr
& 0x00ff0000) >> 16,
546 (assign
->addr
& 0x0000ff00) >> 8,
547 (assign
->addr
& 0x000000ff));
551 for (uint32_t i
= 0; i
< count
; ++i
) {
552 if (dhcpv4_test(iface
, try)) {
553 /* test was successful: IP address is not assigned, assign it */
555 syslog(LOG_DEBUG
, "assigning mapped IP: %u.%u.%u.%u (try %u of %u)",
556 (assign
->addr
& 0xff000000) >> 24,
557 (assign
->addr
& 0x00ff0000) >> 16,
558 (assign
->addr
& 0x0000ff00) >> 8,
559 (assign
->addr
& 0x000000ff), i
, count
);
562 try = (((try - start
) + 1) % count
) + start
;
565 syslog(LOG_WARNING
, "can't assign any IP address -> address space is full");
570 static struct dhcpv4_assignment
* dhcpv4_lease(struct interface
*iface
,
571 enum dhcpv4_msg msg
, const uint8_t *mac
, struct in_addr reqaddr
,
572 uint32_t *leasetime
, const char *hostname
, const size_t hostname_len
)
574 struct dhcpv4_assignment
*lease
= NULL
;
575 uint32_t raddr
= ntohl(reqaddr
.s_addr
);
576 time_t now
= odhcpd_time();
578 struct dhcpv4_assignment
*c
, *n
, *a
= NULL
;
579 list_for_each_entry_safe(c
, n
, &iface
->dhcpv4_assignments
, head
) {
580 if (!memcmp(c
->hwaddr
, mac
, 6)) {
582 if (c
->addr
== raddr
)
584 } else if (!INFINITE_VALID(c
->valid_until
) && c
->valid_until
< now
)
585 free_dhcpv4_assignment(c
);
588 if (msg
== DHCPV4_MSG_DISCOVER
|| msg
== DHCPV4_MSG_REQUEST
) {
590 uint32_t my_leasetime
;
592 if (!a
&& !iface
->no_dynamic_dhcp
) {
593 /* Create new binding */
594 a
= calloc(1, sizeof(*a
));
596 syslog(LOG_ERR
, "Failed to calloc binding on interface %s", iface
->ifname
);
599 memcpy(a
->hwaddr
, mac
, sizeof(a
->hwaddr
));
600 /* Don't consider new assignment as infinite */
601 a
->valid_until
= now
;
603 assigned
= dhcpv4_assign(iface
, a
, raddr
);
605 list_add(&a
->head
, &iface
->dhcpv4_assignments
);
609 my_leasetime
= a
->leasetime
;
611 my_leasetime
= iface
->dhcpv4_leasetime
;
613 if ((*leasetime
== 0) || (my_leasetime
< *leasetime
))
614 *leasetime
= my_leasetime
;
617 if (msg
== DHCPV4_MSG_DISCOVER
) {
618 a
->flags
&= ~OAF_BOUND
;
620 if (!(a
->flags
& OAF_STATIC
))
621 a
->valid_until
= now
;
623 if (hostname_len
> 0) {
624 a
->hostname
= realloc(a
->hostname
, hostname_len
+ 1);
626 memcpy(a
->hostname
, hostname
, hostname_len
);
627 a
->hostname
[hostname_len
] = 0;
631 a
->flags
|= OAF_BOUND
;
633 if (!(a
->flags
& OAF_STATIC
))
634 a
->valid_until
= ((*leasetime
== UINT32_MAX
) ? 0 : (time_t)(now
+ *leasetime
));
636 } else if (!assigned
&& a
) {
637 /* Cleanup failed assignment */
638 free_dhcpv4_assignment(a
);
644 } else if (msg
== DHCPV4_MSG_RELEASE
&& a
) {
645 a
->flags
&= ~OAF_BOUND
;
647 if (!(a
->flags
& OAF_STATIC
))
648 a
->valid_until
= now
- 1;
650 } else if (msg
== DHCPV4_MSG_DECLINE
&& a
) {
651 a
->flags
&= ~OAF_BOUND
;
653 if (!(a
->flags
& OAF_STATIC
)) {
654 memset(a
->hwaddr
, 0, sizeof(a
->hwaddr
));
655 a
->valid_until
= now
+ 3600; /* Block address for 1h */
659 dhcpv6_write_statefile();