2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
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.
25 #include <net/if_arp.h>
26 #include <netinet/ip.h>
27 #include <sys/ioctl.h>
28 #include <sys/timerfd.h>
29 #include <arpa/inet.h>
36 static void handle_dhcpv4(void *addr
, void *data
, size_t len
,
37 struct interface
*iface
, void *dest_addr
);
38 static struct dhcpv4_assignment
* dhcpv4_lease(struct interface
*iface
,
39 enum dhcpv4_msg msg
, const uint8_t *mac
, struct in_addr reqaddr
,
40 const char *hostname
);
42 // Create socket and register events
48 char *dhcpv4_msg_to_string(uint8_t reqmsg
)
51 case (DHCPV4_MSG_DISCOVER
):
52 return "DHCPV4_MSG_DISCOVER";
53 case (DHCPV4_MSG_OFFER
):
54 return "DHCPV4_MSG_OFFER";
55 case (DHCPV4_MSG_REQUEST
):
56 return "DHCPV4_MSG_REQUEST";
57 case (DHCPV4_MSG_DECLINE
):
58 return "DHCPV4_MSG_DECLINE";
59 case (DHCPV4_MSG_ACK
):
60 return "DHCPV4_MSG_ACK";
61 case (DHCPV4_MSG_NAK
):
62 return "DHCPV4_MSG_NAK";
63 case (DHCPV4_MSG_RELEASE
):
64 return "DHCPV4_MSG_RELEASE";
65 case (DHCPV4_MSG_INFORM
):
66 return "DHCPV4_MSG_INFORM";
72 int setup_dhcpv4_interface(struct interface
*iface
, bool enable
)
74 if (iface
->dhcpv4_event
.uloop
.fd
> 0) {
75 uloop_fd_delete(&iface
->dhcpv4_event
.uloop
);
76 close(iface
->dhcpv4_event
.uloop
.fd
);
77 iface
->dhcpv4_event
.uloop
.fd
= -1;
80 if (iface
->dhcpv4
&& enable
) {
81 if (!iface
->dhcpv4_assignments
.next
)
82 INIT_LIST_HEAD(&iface
->dhcpv4_assignments
);
84 int sock
= socket(AF_INET
, SOCK_DGRAM
| SOCK_CLOEXEC
, IPPROTO_UDP
);
86 syslog(LOG_ERR
, "Failed to create DHCPv4 server socket: %s",
91 // Basic IPv6 configuration
93 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &val
, sizeof(val
));
94 setsockopt(sock
, SOL_SOCKET
, SO_BROADCAST
, &val
, sizeof(val
));
95 setsockopt(sock
, IPPROTO_IP
, IP_PKTINFO
, &val
, sizeof(val
));
97 val
= IPTOS_PREC_INTERNETCONTROL
;
98 setsockopt(sock
, IPPROTO_IP
, IP_TOS
, &val
, sizeof(val
));
100 val
= IP_PMTUDISC_DONT
;
101 setsockopt(sock
, IPPROTO_IP
, IP_MTU_DISCOVER
, &val
, sizeof(val
));
103 setsockopt(sock
, SOL_SOCKET
, SO_BINDTODEVICE
,
104 iface
->ifname
, strlen(iface
->ifname
));
106 struct sockaddr_in bind_addr
= {AF_INET
, htons(DHCPV4_SERVER_PORT
),
109 if (bind(sock
, (struct sockaddr
*)&bind_addr
, sizeof(bind_addr
))) {
110 syslog(LOG_ERR
, "Failed to open DHCPv4 server socket: %s",
116 if (ntohl(iface
->dhcpv4_start
.s_addr
) > ntohl(iface
->dhcpv4_end
.s_addr
)) {
117 syslog(LOG_ERR
, "Invalid DHCP range");
121 const char* saddr
= ubus_get_address4(iface
->name
);
123 inet_pton(AF_INET
,saddr
, &addr
);
124 int bits
= ubus_get_mask4(iface
->name
);
126 if (!(bits
< -32 || bits
> 32)) {
127 mask
.s_addr
= bits
? htonl(~((1 << (32 - abs(bits
))) - 1)) : 0;
129 mask
.s_addr
= ~mask
.s_addr
;
133 // Create a range if not specified
134 if (!(iface
->dhcpv4_start
.s_addr
& htonl(0xffff0000)) &&
135 !(iface
->dhcpv4_end
.s_addr
& htonl(0xffff0000))) {
138 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
139 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
141 if (start
&& end
&& start
< end
&&
142 start
> ntohl(addr
.s_addr
& ~mask
.s_addr
) &&
143 (start
& ntohl(~mask
.s_addr
)) == start
&&
144 (end
& ntohl(~mask
.s_addr
)) == end
) {
145 iface
->dhcpv4_start
.s_addr
= htonl(start
) |
146 (addr
.s_addr
& mask
.s_addr
);
147 iface
->dhcpv4_end
.s_addr
= htonl(end
) |
148 (addr
.s_addr
& mask
.s_addr
);
149 } else if (ntohl(mask
.s_addr
) <= 0xfffffff0) {
150 start
= addr
.s_addr
& mask
.s_addr
;
151 end
= addr
.s_addr
& mask
.s_addr
;
153 if (ntohl(mask
.s_addr
) <= 0xffffff00) {
154 iface
->dhcpv4_start
.s_addr
= start
| htonl(100);
155 iface
->dhcpv4_end
.s_addr
= end
| htonl(250);
156 } else if (ntohl(mask
.s_addr
) <= 0xffffffc0) {
157 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
158 iface
->dhcpv4_end
.s_addr
= end
| htonl(60);
159 } else if (ntohl(mask
.s_addr
) <= 0xffffffe0) {
160 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
161 iface
->dhcpv4_end
.s_addr
= end
| htonl(30);
163 iface
->dhcpv4_start
.s_addr
= start
| htonl(3);
164 iface
->dhcpv4_end
.s_addr
= end
| htonl(12);
171 // Parse static entries
173 list_for_each_entry(lease
, &leases
, head
) {
175 size_t hostlen
= strlen(lease
->hostname
) + 1;
176 struct dhcpv4_assignment
*a
= calloc(1, sizeof(*a
) + hostlen
);
178 syslog(LOG_ERR
, "Calloc failed for static lease on interface %s",
182 a
->addr
= ntohl(lease
->ipaddr
.s_addr
);
183 memcpy(a
->hwaddr
, lease
->mac
.ether_addr_octet
, sizeof(a
->hwaddr
));
184 memcpy(a
->hostname
, lease
->hostname
, hostlen
);
185 a
->valid_until
= LONG_MAX
;
187 // Assign to all interfaces
188 struct dhcpv4_assignment
*c
;
189 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
190 if (c
->addr
> a
->addr
) {
191 list_add_tail(&a
->head
, &c
->head
);
193 } else if (c
->addr
== a
->addr
) {
194 // Already an assignment with that number
198 if (&c
->head
== &iface
->dhcpv4_assignments
) {
199 list_add(&a
->head
, &iface
->dhcpv4_assignments
);
206 // Clean invalid assignments
207 struct dhcpv4_assignment
*a
, *n
;
208 list_for_each_entry_safe(a
, n
, &iface
->dhcpv4_assignments
, head
) {
209 if ((htonl(a
->addr
) & mask
.s_addr
) !=
210 (iface
->dhcpv4_start
.s_addr
& mask
.s_addr
)) {
217 if (iface
->dhcpv4_leasetime
< 60)
218 iface
->dhcpv4_leasetime
= 43200;
220 iface
->dhcpv4_event
.uloop
.fd
= sock
;
221 iface
->dhcpv4_event
.handle_dgram
= handle_dhcpv4
;
222 odhcpd_register(&iface
->dhcpv4_event
);
223 } else if (iface
->dhcpv4_assignments
.next
) {
224 while (!list_empty(&iface
->dhcpv4_assignments
)) {
225 struct dhcpv4_assignment
*a
= list_first_entry(&iface
->dhcpv4_assignments
,
226 struct dhcpv4_assignment
, head
);
236 static void dhcpv4_put(struct dhcpv4_message
*msg
, uint8_t **cookie
,
237 uint8_t type
, uint8_t len
, const void *data
)
239 uint8_t *c
= *cookie
;
240 if (*cookie
+ 2 + len
> (uint8_t*)&msg
[1])
245 memcpy(c
, data
, len
);
251 // Simple DHCPv6-server for information requests
252 static void handle_dhcpv4(void *addr
, void *data
, size_t len
,
253 struct interface
*iface
, _unused
void *dest_addr
)
258 struct dhcpv4_message
*req
= data
;
259 if (len
< offsetof(struct dhcpv4_message
, options
) + 4 ||
260 req
->op
!= DHCPV4_BOOTREQUEST
|| req
->hlen
!= 6)
263 int sock
= iface
->dhcpv4_event
.uloop
.fd
;
264 struct sockaddr_in ifaddr
;
265 struct sockaddr_in ifnetmask
;
267 syslog(LOG_NOTICE
, "Got DHCPv4 request");
270 memcpy(ifreq
.ifr_name
, iface
->ifname
, sizeof(ifreq
.ifr_name
));
271 if (ioctl(sock
, SIOCGIFADDR
, &ifreq
)) {
272 syslog(LOG_WARNING
, "DHCPv4 failed to detect address: %s", strerror(errno
));
276 memcpy(&ifaddr
, &ifreq
.ifr_addr
, sizeof(ifaddr
));
277 if (ioctl(sock
, SIOCGIFNETMASK
, &ifreq
))
280 memcpy(&ifnetmask
, &ifreq
.ifr_netmask
, sizeof(ifnetmask
));
281 uint32_t network
= ifaddr
.sin_addr
.s_addr
& ifnetmask
.sin_addr
.s_addr
;
283 if ((iface
->dhcpv4_start
.s_addr
& ifnetmask
.sin_addr
.s_addr
) != network
||
284 (iface
->dhcpv4_end
.s_addr
& ifnetmask
.sin_addr
.s_addr
) != network
) {
285 syslog(LOG_WARNING
, "DHCPv4 range out of assigned network");
289 struct ifreq ifr
= {.ifr_name
= ""};
290 strncpy(ifr
.ifr_name
, iface
->ifname
, sizeof(ifr
.ifr_name
));
292 struct dhcpv4_message reply
= {
293 .op
= DHCPV4_BOOTREPLY
,
300 .ciaddr
= {INADDR_ANY
},
301 .giaddr
= req
->giaddr
,
302 .siaddr
= ifaddr
.sin_addr
,
304 memcpy(reply
.chaddr
, req
->chaddr
, sizeof(reply
.chaddr
));
306 reply
.options
[0] = 0x63;
307 reply
.options
[1] = 0x82;
308 reply
.options
[2] = 0x53;
309 reply
.options
[3] = 0x63;
311 uint8_t *cookie
= &reply
.options
[4];
312 uint8_t reqmsg
= DHCPV4_MSG_REQUEST
;
313 uint8_t msg
= DHCPV4_MSG_ACK
;
315 struct in_addr reqaddr
= {INADDR_ANY
};
319 uint8_t *start
= &req
->options
[4];
320 uint8_t *end
= ((uint8_t*)data
) + len
;
321 struct dhcpv4_option
*opt
;
322 dhcpv4_for_each_option(start
, end
, opt
) {
323 if (opt
->type
== DHCPV4_OPT_MESSAGE
&& opt
->len
== 1) {
324 reqmsg
= opt
->data
[0];
325 } else if (opt
->type
== DHCPV4_OPT_HOSTNAME
&& opt
->len
> 0) {
326 memcpy(hostname
, opt
->data
, opt
->len
);
327 hostname
[opt
->len
] = 0;
328 } else if (opt
->type
== DHCPV4_OPT_IPADDRESS
&& opt
->len
== 4) {
329 memcpy(&reqaddr
, opt
->data
, 4);
330 } else if (opt
->type
== DHCPV4_OPT_SERVERID
&& opt
->len
== 4) {
331 if (memcmp(opt
->data
, &ifaddr
.sin_addr
, 4))
333 } else if (iface
->filter_class
&& opt
->type
== DHCPV4_OPT_USER_CLASS
) {
334 uint8_t *c
= opt
->data
, *cend
= &opt
->data
[opt
->len
];
335 for (; c
< cend
&& &c
[*c
] < cend
; c
= &c
[1 + *c
]) {
336 size_t elen
= strlen(iface
->filter_class
);
337 if (*c
== elen
&& !memcmp(&c
[1], iface
->filter_class
, elen
))
338 return; // Ignore from homenet
343 if (reqmsg
!= DHCPV4_MSG_DISCOVER
&& reqmsg
!= DHCPV4_MSG_REQUEST
&&
344 reqmsg
!= DHCPV4_MSG_INFORM
&& reqmsg
!= DHCPV4_MSG_DECLINE
&&
345 reqmsg
!= DHCPV4_MSG_RELEASE
)
348 struct dhcpv4_assignment
*lease
= NULL
;
349 if (reqmsg
!= DHCPV4_MSG_INFORM
)
350 lease
= dhcpv4_lease(iface
, reqmsg
, req
->chaddr
, reqaddr
, hostname
);
353 if (reqmsg
== DHCPV4_MSG_REQUEST
)
354 msg
= DHCPV4_MSG_NAK
;
355 else if (reqmsg
== DHCPV4_MSG_DISCOVER
)
357 } else if (reqmsg
== DHCPV4_MSG_DISCOVER
) {
358 msg
= DHCPV4_MSG_OFFER
;
359 } else if (reqmsg
== DHCPV4_MSG_REQUEST
&& reqaddr
.s_addr
&&
360 reqaddr
.s_addr
!= htonl(lease
->addr
)) {
361 msg
= DHCPV4_MSG_NAK
;
363 * DHCP client requested an IP which we can't offer to him. Probably the
364 * client changed the network. The reply type is set to DHCPV4_MSG_NAK,
365 * because the client should not use that IP.
367 * For modern devices we build an answer that includes a valid IP, like
368 * a DHCPV4_MSG_ACK. The client will use that IP and doesn't need to
369 * perform additional DHCP round trips.
374 syslog(LOG_WARNING
, "received %s from %x:%x:%x:%x:%x:%x",
375 dhcpv4_msg_to_string(reqmsg
),
376 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
377 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5]);
379 if (reqmsg
== DHCPV4_MSG_DECLINE
|| reqmsg
== DHCPV4_MSG_RELEASE
)
382 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MESSAGE
, 1, &msg
);
383 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SERVERID
, 4, &ifaddr
.sin_addr
);
386 reply
.yiaddr
.s_addr
= htonl(lease
->addr
);
388 uint32_t val
= htonl(iface
->dhcpv4_leasetime
);
389 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_LEASETIME
, 4, &val
);
391 val
= htonl(500 * iface
->dhcpv4_leasetime
/ 1000);
392 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_RENEW
, 4, &val
);
394 val
= htonl(875 * iface
->dhcpv4_leasetime
/ 1000);
395 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_REBIND
, 4, &val
);
397 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_NETMASK
, 4, &ifnetmask
.sin_addr
);
399 if (lease
->hostname
[0])
400 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_HOSTNAME
,
401 strlen(lease
->hostname
), lease
->hostname
);
403 if (!ioctl(sock
, SIOCGIFBRDADDR
, &ifr
)) {
404 struct sockaddr_in
*ina
= (struct sockaddr_in
*)&ifr
.ifr_broadaddr
;
405 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_BROADCAST
, 4, &ina
->sin_addr
);
409 if (!ioctl(sock
, SIOCGIFMTU
, &ifr
)) {
410 uint16_t mtu
= htons(ifr
.ifr_mtu
);
411 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MTU
, 2, &mtu
);
414 if (iface
->search
&& iface
->search_len
<= 255) {
415 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
416 iface
->search_len
, iface
->search
);
417 } else if (!res_init() && _res
.dnsrch
[0] && _res
.dnsrch
[0][0]) {
418 uint8_t search_buf
[256];
419 int len
= dn_comp(_res
.dnsrch
[0], search_buf
,
420 sizeof(search_buf
), NULL
, NULL
);
422 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
426 if (iface
->dhcpv4_router_cnt
== 0)
427 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
, 4, &ifaddr
.sin_addr
);
429 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
,
430 4 * iface
->dhcpv4_router_cnt
, iface
->dhcpv4_router
);
433 if (iface
->dhcpv4_dns_cnt
== 0)
434 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
, 4, &ifaddr
.sin_addr
);
436 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
,
437 4 * iface
->dhcpv4_dns_cnt
, iface
->dhcpv4_dns
);
440 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_END
, 0, NULL
);
442 struct sockaddr_in dest
= *((struct sockaddr_in
*)addr
);
443 if (req
->giaddr
.s_addr
) {
445 * relay agent is configured, send reply to the agent
447 dest
.sin_addr
= req
->giaddr
;
448 dest
.sin_port
= htons(DHCPV4_SERVER_PORT
);
449 } else if (req
->ciaddr
.s_addr
&& req
->ciaddr
.s_addr
!= dest
.sin_addr
.s_addr
) {
451 * client has existing configuration (ciaddr is set) AND this address is
452 * not the address it used for the dhcp message
454 dest
.sin_addr
= req
->ciaddr
;
455 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
456 } else if ((ntohs(req
->flags
) & DHCPV4_FLAG_BROADCAST
) ||
457 req
->hlen
!= reply
.hlen
|| !reply
.yiaddr
.s_addr
) {
459 * client requests a broadcast reply OR we can't offer an IP
461 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
462 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
463 } else if (!req
->ciaddr
.s_addr
&& msg
== DHCPV4_MSG_NAK
) {
465 * client has no previous configuration -> no IP, so we need to reply
466 * with a broadcast packet
468 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
469 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
472 * send reply to the newly (in this proccess) allocated IP
474 dest
.sin_addr
= reply
.yiaddr
;
475 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
477 struct arpreq arp
= {.arp_flags
= ATF_COM
};
478 memcpy(arp
.arp_ha
.sa_data
, req
->chaddr
, 6);
479 memcpy(&arp
.arp_pa
, &dest
, sizeof(arp
.arp_pa
));
480 memcpy(arp
.arp_dev
, iface
->ifname
, sizeof(arp
.arp_dev
));
481 ioctl(sock
, SIOCSARP
, &arp
);
484 if (dest
.sin_addr
.s_addr
== INADDR_BROADCAST
) {
486 * reply goes to IP broadcast -> MAC broadcast
488 syslog(LOG_WARNING
, "sending %s to ff:ff:ff:ff:ff:ff - %s",
489 dhcpv4_msg_to_string(msg
),
490 inet_ntoa(dest
.sin_addr
));
493 * reply is send directly to IP,
494 * MAC is assumed to be the same as the request
496 syslog(LOG_WARNING
, "sending %s to %x:%x:%x:%x:%x:%x - %s",
497 dhcpv4_msg_to_string(msg
),
498 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
499 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5],
500 inet_ntoa(dest
.sin_addr
));
503 sendto(sock
, &reply
, sizeof(reply
), MSG_DONTWAIT
,
504 (struct sockaddr
*)&dest
, sizeof(dest
));
507 static bool dhcpv4_test(struct interface
*iface
, uint32_t try)
509 struct dhcpv4_assignment
*c
;
510 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
511 if (c
->addr
== try) {
518 static bool dhcpv4_assign(struct interface
*iface
,
519 struct dhcpv4_assignment
*assign
, uint32_t raddr
)
521 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
522 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
523 uint32_t count
= end
- start
+ 1;
525 // try to assign the IP the client asked for
526 if (start
<= raddr
&& raddr
<= end
&& dhcpv4_test(iface
, raddr
)) {
527 assign
->addr
= raddr
;
528 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
529 syslog(LOG_DEBUG
, "assigning the IP the client asked for: %u.%u.%u.%u",
530 (assign
->addr
& 0xff000000) >> 24,
531 (assign
->addr
& 0x00ff0000) >> 16,
532 (assign
->addr
& 0x0000ff00) >> 8,
533 (assign
->addr
& 0x000000ff));
537 // Seed RNG with checksum of hwaddress
539 for (size_t i
= 0; i
< sizeof(assign
->hwaddr
); ++i
) {
540 // Knuth's multiplicative method
541 uint8_t o
= assign
->hwaddr
[i
];
542 seed
+= (o
*2654435761) % UINT32_MAX
;
546 uint32_t try = (((uint32_t)rand()) % count
) + start
;
548 if (list_empty(&iface
->dhcpv4_assignments
)) {
550 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
551 syslog(LOG_DEBUG
, "assigning mapped IP (empty list): %u.%u.%u.%u",
552 (assign
->addr
& 0xff000000) >> 24,
553 (assign
->addr
& 0x00ff0000) >> 16,
554 (assign
->addr
& 0x0000ff00) >> 8,
555 (assign
->addr
& 0x000000ff));
559 for (uint32_t i
= 0; i
< count
; ++i
) {
560 if (dhcpv4_test(iface
, try)) {
561 /* test was successful: IP address is not assigned, assign it */
563 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
564 syslog(LOG_DEBUG
, "assigning mapped IP: %u.%u.%u.%u (try %u of %u)",
565 (assign
->addr
& 0xff000000) >> 24,
566 (assign
->addr
& 0x00ff0000) >> 16,
567 (assign
->addr
& 0x0000ff00) >> 8,
568 (assign
->addr
& 0x000000ff), i
, count
);
571 try = (((try - start
) + 1) % count
) + start
;
574 syslog(LOG_DEBUG
, "can't assign any IP address -> address space is full");
579 static struct dhcpv4_assignment
* dhcpv4_lease(struct interface
*iface
,
580 enum dhcpv4_msg msg
, const uint8_t *mac
, struct in_addr reqaddr
,
581 const char *hostname
)
583 struct dhcpv4_assignment
*lease
= NULL
;
584 uint32_t raddr
= ntohl(reqaddr
.s_addr
);
585 time_t now
= odhcpd_time();
587 struct dhcpv4_assignment
*c
, *n
, *a
= NULL
;
588 list_for_each_entry_safe(c
, n
, &iface
->dhcpv4_assignments
, head
) {
589 if (!memcmp(c
->hwaddr
, mac
, 6)) {
591 if (c
->addr
== raddr
)
593 } else if (c
->valid_until
< now
) {
599 if (msg
== DHCPV4_MSG_DISCOVER
|| msg
== DHCPV4_MSG_REQUEST
) {
601 size_t hostlen
= strlen(hostname
) + 1;
603 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
604 a
= calloc(1, sizeof(*a
) + hostlen
);
606 syslog(LOG_ERR
, "Failed to calloc binding on interface %s", iface
->ifname
);
609 memcpy(a
->hwaddr
, mac
, sizeof(a
->hwaddr
));
610 memcpy(a
->hostname
, hostname
, hostlen
);
612 assigned
= dhcpv4_assign(iface
, a
, raddr
);
615 if (assigned
&& !a
->hostname
[0] && hostname
) {
616 a
= realloc(a
, sizeof(*a
) + hostlen
);
618 syslog(LOG_ERR
, "Failed to realloc binding on interface %s", iface
->ifname
);
621 memcpy(a
->hostname
, hostname
, hostlen
);
624 a
->head
.next
->prev
= &a
->head
;
625 a
->head
.prev
->next
= &a
->head
;
628 // Was only a solicitation: mark binding for removal
629 if (assigned
&& a
->valid_until
< now
) {
630 a
->valid_until
= (msg
== DHCPV4_MSG_DISCOVER
) ? 0 :
631 (now
+ iface
->dhcpv4_leasetime
);
632 } else if (!assigned
&& a
) { // Cleanup failed assignment
639 } else if (msg
== DHCPV4_MSG_RELEASE
) {
640 if (a
&& a
->valid_until
!= LONG_MAX
)
642 } else if (msg
== DHCPV4_MSG_DECLINE
&& a
&& a
->valid_until
!= LONG_MAX
) {
643 memset(a
->hwaddr
, 0, sizeof(a
->hwaddr
));
644 a
->valid_until
= now
+ 3600; // Block address for 1h
647 dhcpv6_write_statefile();