- break;
-
- case DHCP_OPTION_SUBNET_MASK:
- if (len >= 4)
- memcpy(&lease->subnet_mask, option, 4);
-
- break;
-
- case DHCP_OPTION_ROUTER:
- if (len >= 4)
- memcpy(&lease->router, option, 4);
-
- break;
-
- case DHCP_OPTION_DOMAIN_NAME_SERVER:
- if (len && !(len % 4)) {
- unsigned i;
-
- lease->dns_size = len / 4;
-
- free(lease->dns);
- lease->dns = new0(struct in_addr, lease->dns_size);
- if (!lease->dns)
- return -ENOMEM;
-
- for (i = 0; i < lease->dns_size; i++) {
- memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
- }
- }
-
- break;
-
- case DHCP_OPTION_INTERFACE_MTU:
- if (len >= 2) {
- be16_t mtu;
-
- memcpy(&mtu, option, 2);
- lease->mtu = be16toh(mtu);
-
- if (lease->mtu < 68)
- lease->mtu = 0;
- }
-
- break;
-
- case DHCP_OPTION_DOMAIN_NAME:
- if (len >= 1) {
- free(lease->domainname);
- lease->domainname = strndup((const char *)option, len);
- }
-
- break;
-
- case DHCP_OPTION_HOST_NAME:
- if (len >= 1) {
- free(lease->hostname);
- lease->hostname = strndup((const char *)option, len);
- }
-
- break;
-
- case DHCP_OPTION_RENEWAL_T1_TIME:
- if (len == 4) {
- memcpy(&val, option, 4);
- lease->t1 = be32toh(val);
- }
-
- break;
-
- case DHCP_OPTION_REBINDING_T2_TIME:
- if (len == 4) {
- memcpy(&val, option, 4);
- lease->t2 = be32toh(val);
- }
-
- break;
- }
-
- return 0;
-}
-
-static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
- size_t len) {
- size_t hdrlen;
-
- if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
- return -EINVAL;
-
- hdrlen = message->ip.ihl * 4;
- if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
- hdrlen))
- return -EINVAL;
-
- if (hdrlen + be16toh(message->udp.len) > len)
- return -EINVAL;
-
- if (message->udp.check) {
- message->ip.check = message->udp.len;
- message->ip.ttl = 0;
-
- if (client_checksum(&message->ip.ttl,
- be16toh(message->udp.len) + 12))
- return -EINVAL;
- }
-
- if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
- be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
- return -EINVAL;
-
- if (message->dhcp.op != BOOTREPLY)
- return -EINVAL;
-
- if (be32toh(message->dhcp.xid) != client->xid)
- return -EINVAL;
-
- if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
- ETHER_ADDR_LEN))
- return -EINVAL;
-
- return 0;