size_t send_message (const interface_t *iface, const dhcp_t *dhcp,
unsigned long xid, char type,
const options_t *options)
{
dhcpmessage_t message;
struct udp_dhcp_packet packet;
unsigned char *m = (unsigned char *) &message;
unsigned char *p = (unsigned char *) &message.options;
unsigned char *n_params = NULL;
unsigned long l;
struct in_addr from;
struct in_addr to;
long up = uptime() - iface->start_uptime;
uint32_t ul;
uint16_t sz;
unsigned int message_length;
if (!iface || !options || !dhcp)
return -1;
memset (&from, 0, sizeof (from));
memset (&to, 0, sizeof (to));
if (type == DHCP_RELEASE)
to.s_addr = dhcp->serveraddress.s_addr;
memset (&message, 0, sizeof (dhcpmessage_t));
if (type == DHCP_INFORM ||
type == DHCP_RELEASE ||
type == DHCP_REQUEST)
{
message.ciaddr = iface->previous_address.s_addr;
from.s_addr = iface->previous_address.s_addr;
}
message.op = DHCP_BOOTREQUEST;
message.hwtype = iface->family;
switch (iface->family) {
case ARPHRD_ETHER:
case ARPHRD_IEEE802:
message.hwlen = ETHER_ADDR_LEN;
memcpy (&message.chaddr, &iface->hwaddr, ETHER_ADDR_LEN);
break;
case ARPHRD_IEEE1394:
case ARPHRD_INFINIBAND:
if (message.ciaddr == 0)
message.flags = htons (BROADCAST_FLAG);
message.hwlen = 0;
break;
default:
logger (LOG_ERR, "dhcp: unknown hardware type %d", iface->family);
}
if (up < 0 || up > UINT16_MAX)
message.secs = htons ((short) UINT16_MAX);
else
message.secs = htons (up);
message.xid = xid;
message.cookie = htonl (MAGIC_COOKIE);
*p++ = DHCP_MESSAGETYPE;
*p++ = 1;
*p++ = type;
if (type == DHCP_REQUEST) {
*p++ = DHCP_MAXMESSAGESIZE;
*p++ = 2;
sz = get_mtu (iface->name);
if (sz < MTU_MIN) {
if (set_mtu (iface->name, MTU_MIN) == 0)
sz = MTU_MIN;
}
sz = htons (sz);
memcpy (p, &sz, 2);
p += 2;
}
#define PUTADDR(_type, _val) \
{ \
*p++ = _type; \
*p++ = 4; \
memcpy (p, &_val.s_addr, 4); \
p += 4; \
}
if (dhcp->address.s_addr != 0 && iface->previous_address.s_addr == 0
&& type != DHCP_RELEASE)
PUTADDR (DHCP_ADDRESS, dhcp->address);
if (dhcp->serveraddress.s_addr != 0 && dhcp->address.s_addr !=0 &&
(iface->previous_address.s_addr == 0 || type == DHCP_RELEASE))
PUTADDR (DHCP_SERVERIDENTIFIER, dhcp->serveraddress);
#undef PUTADDR
if (type == DHCP_REQUEST || type == DHCP_DISCOVER) {
if (options->leasetime != 0) {
*p++ = DHCP_LEASETIME;
*p++ = 4;
ul = htonl (options->leasetime);
memcpy (p, &ul, 4);
p += 4;
}
}
if (type == DHCP_DISCOVER || type == DHCP_INFORM || type == DHCP_REQUEST) {
*p++ = DHCP_PARAMETERREQUESTLIST;
n_params = p;
*p++ = 0;
/* Only request DNSSERVER in discover to keep the packets small.
RFC2131 Section 3.5 states that the REQUEST must include the list
from the DISCOVER message, so I think we can safely do this. */
if (type == DHCP_DISCOVER)
*p++ = DHCP_DNSSERVER;
else {
*p++ = DHCP_RENEWALTIME;
*p++ = DHCP_REBINDTIME;
*p++ = DHCP_NETMASK;
*p++ = DHCP_BROADCAST;
*p++ = DHCP_CSR;
/* RFC 3442 states classless static routes should be before routers
* and static routes as classless static routes override them both */
*p++ = DHCP_STATICROUTE;
*p++ = DHCP_ROUTERS;
*p++ = DHCP_HOSTNAME;
*p++ = DHCP_DNSSEARCH;
*p++ = DHCP_DNSDOMAIN;
*p++ = DHCP_DNSSERVER;
*p++ = DHCP_NISDOMAIN;
*p++ = DHCP_NISSERVER;
*p++ = DHCP_NTPSERVER;
*p++ = DHCP_MTU;
*p++ = DHCP_ROOTPATH;
/* These parameters were requested by dhcpcd-2.0 and earlier
but we never did anything with them */
/* *p++ = DHCP_DEFAULTIPTTL;
*p++ = DHCP_MASKDISCOVERY;
*p++ = DHCP_ROUTERDISCOVERY; */
}
*n_params = p - n_params - 1;
if (*options->hostname) {
if (options->fqdn == FQDN_DISABLE) {
*p++ = DHCP_HOSTNAME;
*p++ = l = strlen (options->hostname);
memcpy (p, options->hostname, l);
p += l;
} else {
/* Draft IETF DHC-FQDN option (81) */
*p++ = DHCP_FQDN;
*p++ = (l = strlen (options->hostname)) + 3;
/* Flags: 0000NEOS
* S: 1 => Client requests Server to update A RR in DNS as well as PTR
* O: 1 => Server indicates to client that DNS has been updated
* E: 1 => Name data is DNS format
* N: 1 => Client requests Server to not update DNS
*/
*p++ = options->fqdn & 0x9;
*p++ = 0; /* rcode1, response from DNS server for PTR RR */
*p++ = 0; /* rcode2, response from DNS server for A RR if S=1 */
memcpy (p, options->hostname, l);
p += l;
}
}
}
if (type != DHCP_DECLINE && type != DHCP_RELEASE) {
if (options->userclass_len > 0) {
*p++ = DHCP_USERCLASS;
*p++ = options->userclass_len;
memcpy (p, &options->userclass, options->userclass_len);
p += options->userclass_len;
}
*p++ = DHCP_CLASSID;
*p++ = l = strlen (options->classid);
memcpy (p, options->classid, l);
p += l;
}
*p++ = DHCP_CLIENTID;
if (options->clientid[0]) {
l = strlen (options->clientid);
*p++ = l + 1;
*p++ = 0; /* string */
memcpy (p, options->clientid, l);
p += l;
} else {
*p++ = iface->hwlen + 1;
*p++ = iface->family;
memcpy (p, iface->hwaddr, iface->hwlen);
p += iface->hwlen;
}
#ifdef BOOTP_MESSAGE_LENTH_MIN
/* Some crappy DHCP servers think they have to obey the BOOTP minimum
* messag length. They are wrong, but we should still cater for them */
while (p - m < BOOTP_MESSAGE_LENTH_MIN - 1)
*p++ = DHCP_PAD;
#endif
*p++ = DHCP_END;
message_length = p - m;
memset (&packet, 0, sizeof (struct udp_dhcp_packet));
make_dhcp_packet (&packet, (unsigned char *) &message, message_length,
from, to);
logger (LOG_DEBUG, "sending %s with xid 0x%lx", dhcp_message[(int) type], xid);
return send_packet (iface, ETHERTYPE_IP, (unsigned char *) &packet,
message_length + sizeof (struct ip) +
sizeof (struct udphdr));
}
ssize_t
make_message(struct dhcp_message **message,
const struct interface *iface, const struct dhcp_lease *lease,
uint32_t xid, uint8_t type, const struct options *options)
{
struct dhcp_message *dhcp;
uint8_t *m, *lp, *p;
uint8_t *n_params = NULL;
time_t up = uptime() - iface->start_uptime;
uint32_t ul;
uint16_t sz;
const struct dhcp_opt *opt;
size_t len;
const char *hp;
dhcp = xzalloc(sizeof (*dhcp));
m = (uint8_t *)dhcp;
p = dhcp->options;
if ((type == DHCP_INFORM ||
type == DHCP_RELEASE ||
type == DHCP_REQUEST) &&
!IN_LINKLOCAL(ntohl(iface->addr.s_addr)))
{
dhcp->ciaddr = iface->addr.s_addr;
/* Just incase we haven't actually configured the address yet */
if (type == DHCP_INFORM && iface->addr.s_addr == 0)
dhcp->ciaddr = lease->addr.s_addr;
/* Zero the address if we're currently on a different subnet */
if (type == DHCP_REQUEST &&
iface->net.s_addr != lease->net.s_addr)
dhcp->ciaddr = 0;
}
dhcp->op = DHCP_BOOTREQUEST;
dhcp->hwtype = iface->family;
switch (iface->family) {
case ARPHRD_ETHER:
case ARPHRD_IEEE802:
dhcp->hwlen = ETHER_ADDR_LEN;
memcpy(&dhcp->chaddr, &iface->hwaddr, ETHER_ADDR_LEN);
break;
case ARPHRD_IEEE1394:
case ARPHRD_INFINIBAND:
dhcp->hwlen = 0;
if (dhcp->ciaddr == 0 &&
type != DHCP_DECLINE && type != DHCP_RELEASE)
dhcp->flags = htons(BROADCAST_FLAG);
break;
}
if (type != DHCP_DECLINE && type != DHCP_RELEASE) {
if (up < 0 || up > (time_t)UINT16_MAX)
dhcp->secs = htons((uint16_t)UINT16_MAX);
else
dhcp->secs = htons(up);
}
dhcp->xid = xid;
dhcp->cookie = htonl(MAGIC_COOKIE);
*p++ = DHO_MESSAGETYPE;
*p++ = 1;
*p++ = type;
if (iface->clientid) {
*p++ = DHO_CLIENTID;
memcpy(p, iface->clientid, iface->clientid[0] + 1);
p += iface->clientid[0] + 1;
}
if (lease->addr.s_addr && !IN_LINKLOCAL(htonl(lease->addr.s_addr))) {
if (type == DHCP_DECLINE ||
type == DHCP_DISCOVER ||
(type == DHCP_REQUEST &&
lease->addr.s_addr != iface->addr.s_addr))
{
PUTADDR(DHO_IPADDRESS, lease->addr);
if (lease->server.s_addr)
PUTADDR(DHO_SERVERID, lease->server);
}
}
if (type == DHCP_DECLINE) {
*p++ = DHO_MESSAGE;
len = strlen(DAD);
*p++ = len;
memcpy(p, DAD, len);
p += len;
}
if (type == DHCP_RELEASE) {
if (lease->server.s_addr)
PUTADDR(DHO_SERVERID, lease->server);
}
if (type == DHCP_DISCOVER ||
type == DHCP_INFORM ||
type == DHCP_REQUEST)
{
*p++ = DHO_MAXMESSAGESIZE;
*p++ = 2;
sz = get_mtu(iface->name);
if (sz < MTU_MIN) {
if (set_mtu(iface->name, MTU_MIN) == 0)
sz = MTU_MIN;
}
sz = htons(sz);
memcpy(p, &sz, 2);
p += 2;
if (options->userclass[0]) {
*p++ = DHO_USERCLASS;
memcpy(p, options->userclass, options->userclass[0] + 1);
p += options->userclass[0] + 1;
}
if (options->vendorclassid[0]) {
*p++ = DHO_VENDORCLASSID;
memcpy(p, options->vendorclassid,
options->vendorclassid[0] + 1);
p += options->vendorclassid[0] + 1;
}
if (type != DHCP_INFORM) {
if (options->leasetime != 0) {
*p++ = DHO_LEASETIME;
*p++ = 4;
ul = htonl(options->leasetime);
memcpy(p, &ul, 4);
p += 4;
}
}
/* Regardless of RFC2132, we should always send a hostname
* upto the first dot (the short hostname) as otherwise
* confuses some DHCP servers when updating DNS.
* The FQDN option should be used if a FQDN is required. */
if (options->hostname[0]) {
*p++ = DHO_HOSTNAME;
hp = strchr(options->hostname, '.');
if (hp)
len = hp - options->hostname;
else
len = strlen(options->hostname);
*p++ = len;
memcpy(p, options->hostname, len);
p += len;
}
if (options->fqdn != FQDN_DISABLE) {
/* IETF DHC-FQDN option (81), RFC4702 */
*p++ = DHO_FQDN;
lp = p;
*p++ = 3;
/*
* Flags: 0000NEOS
* S: 1 => Client requests Server to update
* a RR in DNS as well as PTR
* O: 1 => Server indicates to client that
* DNS has been updated
* E: 1 => Name data is DNS format
* N: 1 => Client requests Server to not
* update DNS
*/
*p++ = (options->fqdn & 0x09) | 0x04;
*p++ = 0; /* from server for PTR RR */
*p++ = 0; /* from server for A RR if S=1 */
ul = encode_rfc1035(options->hostname, p);
*lp += ul;
p += ul;
}
/* vendor is already encoded correctly, so just add it */
if (options->vendor[0]) {
*p++ = DHO_VENDOR;
memcpy(p, options->vendor, options->vendor[0] + 1);
p += options->vendor[0] + 1;
}
*p++ = DHO_PARAMETERREQUESTLIST;
n_params = p;
*p++ = 0;
for (opt = dhcp_opts; opt->option; opt++) {
if (!(opt->type & REQUEST ||
has_option_mask(options->requestmask, opt->option)))
continue;
switch (opt->option) {
case DHO_RENEWALTIME: /* FALLTHROUGH */
case DHO_REBINDTIME:
if (type == DHCP_INFORM)
continue;
break;
}
*p++ = opt->option;
}
*n_params = p - n_params - 1;
}
*p++ = DHO_END;
#ifdef BOOTP_MESSAGE_LENTH_MIN
/* Some crappy DHCP servers think they have to obey the BOOTP minimum
* message length.
* They are wrong, but we should still cater for them. */
while (p - m < BOOTP_MESSAGE_LENTH_MIN)
*p++ = DHO_PAD;
#endif
*message = dhcp;
return p - m;
}
size_t send_message (interface_t *iface, dhcp_t *dhcp,
unsigned long xid, char type, options_t *options)
{
dhcpmessage_t message;
unsigned char *p = (unsigned char *) &message.options;
unsigned char *n_params = NULL;
unsigned long l;
struct in_addr from;
struct in_addr to;
if (!iface || !options || !dhcp)
return -1;
if (type == DHCP_RELEASE || type == DHCP_INFORM ||
(type == DHCP_REQUEST &&
iface->previous_address.s_addr == dhcp->address.s_addr))
from.s_addr = dhcp->address.s_addr;
else
from.s_addr = 0;
if (type == DHCP_RELEASE)
to.s_addr = dhcp->serveraddress.s_addr;
else
to.s_addr = 0;
memset (&message, 0, sizeof (dhcpmessage_t));
message.op = DHCP_BOOTREQUEST;
message.hwtype = ARPHRD_ETHER;
message.hwlen = ETHER_ADDR_LEN;
message.secs = htons (10);
message.xid = xid;
memcpy (&message.hwaddr, &iface->ethernet_address, ETHER_ADDR_LEN);
message.cookie = htonl (MAGIC_COOKIE);
/* This logic should be improved so that we don't need to set the 0
flag as it's done in the above memset statement */
if (type == DHCP_REQUEST
&& dhcp->address.s_addr == iface->previous_address.s_addr
&& iface->previous_address.s_addr != 0)
message.flags = 0;
else
message.flags = htons (BROADCAST_FLAG);
if (iface->previous_address.s_addr != 0
&& (type == DHCP_INFORM || type == DHCP_RELEASE
|| (type == DHCP_REQUEST
&& iface->previous_address.s_addr == dhcp->address.s_addr)))
message.ciaddr = iface->previous_address.s_addr;
*p++ = DHCP_MESSAGETYPE;
*p++ = 1;
*p++ = type;
if (type == DHCP_REQUEST)
{
*p++ = DHCP_MAXMESSAGESIZE;
*p++ = 2;
uint16_t sz = htons (sizeof (struct udp_dhcp_packet));
memcpy (p, &sz, 2);
p += 2;
}
#define PUTADDR(_type, _val) \
{ \
*p++ = _type; \
*p++ = 4; \
memcpy (p, &_val.s_addr, 4); \
p += 4; \
}
if (dhcp->address.s_addr != 0 && iface->previous_address.s_addr == 0
&& type != DHCP_RELEASE)
PUTADDR (DHCP_ADDRESS, dhcp->address);
if (dhcp->serveraddress.s_addr != 0 && dhcp->address.s_addr !=0 &&
(iface->previous_address.s_addr == 0 || type == DHCP_RELEASE))
PUTADDR (DHCP_SERVERIDENTIFIER, dhcp->serveraddress);
#undef PUTADDR
if (type == DHCP_REQUEST || type == DHCP_DISCOVER)
{
if (options->leasetime != 0)
{
*p++ = DHCP_LEASETIME;
*p++ = 4;
uint32_t ul = htonl (options->leasetime);
memcpy (p, &ul, 4);
p += 4;
}
}
if (type == DHCP_DISCOVER || type == DHCP_INFORM || type == DHCP_REQUEST)
{
*p++ = DHCP_PARAMETERREQUESTLIST;
n_params = p;
*p++ = 0;
/* If we don't request one item, then we get defaults back which
we don't want */
if (type == DHCP_DISCOVER)
{
*p++ = DHCP_DNSSERVER;
}
else
{
*p++ = DHCP_RENEWALTIME;
*p++ = DHCP_REBINDTIME;
*p++ = DHCP_NETMASK;
*p++ = DHCP_BROADCAST;
*p++ = DHCP_CSR;
/* RFC 3442 states classless static routes should be before routers
* and static routes as classless static routes override them both */
*p++ = DHCP_ROUTERS;
*p++ = DHCP_STATICROUTE;
*p++ = DHCP_HOSTNAME;
*p++ = DHCP_DNSSEARCH;
*p++ = DHCP_DNSDOMAIN;
*p++ = DHCP_DNSSERVER;
*p++ = DHCP_NISDOMAIN;
*p++ = DHCP_NISSERVER;
*p++ = DHCP_NTPSERVER;
/* These parameters were requested by dhcpcd-2.0 and earlier
but we never did anything with them */
/* *p++ = DHCP_DEFAULTIPTTL;
*p++ = DHCP_MASKDISCOVERY;
*p++ = DHCP_ROUTERDISCOVERY; */
}
*n_params = p - n_params - 1;
}
if (type == DHCP_REQUEST)
{
if (options->hostname)
{
if (options->fqdn == FQDN_DISABLE)
{
*p++ = DHCP_HOSTNAME;
*p++ = l = strlen (options->hostname);
memcpy (p, options->hostname, l);
p += l;
}
else
{
/* Draft IETF DHC-FQDN option (81) */
*p++ = DHCP_FQDN;
*p++ = (l = strlen (options->hostname)) + 3;
/* Flags: 0000NEOS
* S: 1 => Client requests Server to update A RR in DNS as well as PTR
* O: 1 => Server indicates to client that DNS has been updated
* E: 1 => Name data is DNS format
* N: 1 => Client requests Server to not update DNS
*/
*p++ = options->fqdn & 0x9;
*p++ = 0; /* rcode1, response from DNS server for PTR RR */
*p++ = 0; /* rcode2, response from DNS server for A RR if S=1 */
memcpy (p, options->hostname, l);
p += l;
}
}
}
if (type != DHCP_DECLINE && type != DHCP_RELEASE)
{
if (options->userclass)
{
*p++ = DHCP_USERCLASS;
*p++ = l = strlen (options->userclass);
memcpy (p, options->userclass, l);
p += l;
}
*p++ = DHCP_CLASSID;
*p++ = l = strlen (options->classid);
memcpy (p, options->classid, l);
p += l;
}
*p++ = DHCP_CLIENTID;
if (options->clientid[0])
{
l = strlen (options->clientid);
*p++ = l + 1;
*p++ = 0; /* string */
memcpy (p, options, l);
p += l;
}
else
{
*p++ = ETHER_ADDR_LEN + 1;
*p++ = ARPHRD_ETHER;
memcpy (p, &iface->ethernet_address, ETHER_ADDR_LEN);
p += ETHER_ADDR_LEN;
}
*p = DHCP_END;
struct udp_dhcp_packet packet;
memset (&packet, 0, sizeof (struct udp_dhcp_packet));
make_dhcp_packet (&packet, (unsigned char *) &message, from, to);
logger (LOG_DEBUG, "Sending %s with xid %d", dhcp_message[(int) type], xid);
return send_packet (iface, ETHERTYPE_IP, (unsigned char *) &packet,
sizeof (struct udp_dhcp_packet));
}
size_t send_message (const interface_t *iface, const dhcp_t *dhcp,
unsigned long xid, char type,
const options_t *options)
{
struct udp_dhcp_packet *packet;
dhcpmessage_t *message;
unsigned char *m;
unsigned char *p;
unsigned char *n_params = NULL;
unsigned long l;
struct in_addr from;
struct in_addr to;
time_t up = uptime() - iface->start_uptime;
uint32_t ul;
uint16_t sz;
unsigned int message_length;
size_t retval;
if (!iface || !options || !dhcp)
return -1;
memset (&from, 0, sizeof (from));
memset (&to, 0, sizeof (to));
if (type == DHCP_RELEASE)
to.s_addr = dhcp->serveraddress.s_addr;
message = xmalloc (sizeof (dhcpmessage_t));
memset (message, 0, sizeof (dhcpmessage_t));
m = (unsigned char *) message;
p = (unsigned char *) &message->options;
if ((type == DHCP_INFORM ||
type == DHCP_RELEASE ||
type == DHCP_REQUEST) &&
! IN_LINKLOCAL (iface->previous_address.s_addr))
{
message->ciaddr = iface->previous_address.s_addr;
from.s_addr = iface->previous_address.s_addr;
/* Just incase we haven't actually configured the address yet */
if (type == DHCP_INFORM && iface->previous_address.s_addr == 0)
message->ciaddr = dhcp->address.s_addr;
/* Zero the address if we're currently on a different subnet */
if (type == DHCP_REQUEST &&
iface->previous_netmask.s_addr != dhcp->netmask.s_addr)
message->ciaddr = from.s_addr = 0;
}
message->op = DHCP_BOOTREQUEST;
message->hwtype = iface->family;
switch (iface->family) {
case ARPHRD_ETHER:
case ARPHRD_IEEE802:
message->hwlen = ETHER_ADDR_LEN;
memcpy (&message->chaddr, &iface->hwaddr, ETHER_ADDR_LEN);
break;
case ARPHRD_IEEE1394:
case ARPHRD_INFINIBAND:
if (message->ciaddr == 0)
message->flags = (int16_t) htons (BROADCAST_FLAG);
message->hwlen = 0;
break;
default:
logger (LOG_ERR, "dhcp: unknown hardware type %d", iface->family);
}
if (up < 0 || up > UINT16_MAX)
message->secs = htons ((short) UINT16_MAX);
else
message->secs = htons (up);
message->xid = xid;
message->cookie = htonl (MAGIC_COOKIE);
*p++ = DHCP_MESSAGETYPE;
*p++ = 1;
*p++ = type;
if (type == DHCP_REQUEST) {
*p++ = DHCP_MAXMESSAGESIZE;
*p++ = 2;
sz = get_mtu (iface->name);
if (sz < MTU_MIN) {
if (set_mtu (iface->name, MTU_MIN) == 0)
sz = MTU_MIN;
}
sz = htons (sz);
memcpy (p, &sz, 2);
p += 2;
}
if (type != DHCP_INFORM) {
#define PUTADDR(_type, _val) \
{ \
*p++ = _type; \
*p++ = 4; \
memcpy (p, &_val.s_addr, 4); \
p += 4; \
}
if (IN_LINKLOCAL (dhcp->address.s_addr))
logger (LOG_ERR, "cannot request a link local address");
else {
if (dhcp->address.s_addr != iface->previous_address.s_addr &&
type != DHCP_RELEASE)
PUTADDR (DHCP_ADDRESS, dhcp->address);
if (dhcp->serveraddress.s_addr != 0 && dhcp->address.s_addr !=0 &&
(iface->previous_address.s_addr == 0 || type == DHCP_RELEASE))
PUTADDR (DHCP_SERVERIDENTIFIER, dhcp->serveraddress);
}
#undef PUTADDR
}
if (type == DHCP_REQUEST || type == DHCP_DISCOVER) {
if (options->leasetime != 0) {
*p++ = DHCP_LEASETIME;
*p++ = 4;
ul = htonl (options->leasetime);
memcpy (p, &ul, 4);
p += 4;
}
}
if (type == DHCP_DISCOVER || type == DHCP_INFORM || type == DHCP_REQUEST) {
*p++ = DHCP_PARAMETERREQUESTLIST;
n_params = p;
*p++ = 0;
/* Only request DNSSERVER in discover to keep the packets small.
RFC2131 Section 3.5 states that the REQUEST must include the list
from the DISCOVER message, so I think we can safely do this. */
if (type == DHCP_DISCOVER && ! options->test)
*p++ = DHCP_DNSSERVER;
else {
if (type != DHCP_INFORM) {
*p++ = DHCP_RENEWALTIME;
*p++ = DHCP_REBINDTIME;
}
*p++ = DHCP_NETMASK;
*p++ = DHCP_BROADCAST;
*p++ = DHCP_CSR;
/* RFC 3442 states classless static routes should be before routers
* and static routes as classless static routes override them both */
*p++ = DHCP_STATICROUTE;
*p++ = DHCP_ROUTERS;
*p++ = DHCP_HOSTNAME;
*p++ = DHCP_DNSSEARCH;
*p++ = DHCP_DNSDOMAIN;
*p++ = DHCP_DNSSERVER;
*p++ = DHCP_NISDOMAIN;
*p++ = DHCP_NISSERVER;
*p++ = DHCP_NTPSERVER;
*p++ = DHCP_MTU;
*p++ = DHCP_ROOTPATH;
*p++ = DHCP_SIPSERVER;
}
*n_params = p - n_params - 1;
if (options->hostname[0]) {
if (options->fqdn == FQDN_DISABLE) {
*p++ = DHCP_HOSTNAME;
*p++ = l = strlen (options->hostname);
memcpy (p, options->hostname, l);
p += l;
} else {
/* Draft IETF DHC-FQDN option (81) */
*p++ = DHCP_FQDN;
*p++ = (l = strlen (options->hostname)) + 3;
/* Flags: 0000NEOS
* S: 1 => Client requests Server to update A RR in DNS as well as PTR
* O: 1 => Server indicates to client that DNS has been updated
* E: 1 => Name data is DNS format
* N: 1 => Client requests Server to not update DNS
*/
*p++ = options->fqdn & 0x9;
*p++ = 0; /* rcode1, response from DNS server for PTR RR */
*p++ = 0; /* rcode2, response from DNS server for A RR if S=1 */
memcpy (p, options->hostname, l);
p += l;
}
}
}
if (type != DHCP_DECLINE && type != DHCP_RELEASE) {
if (options->userclass_len > 0) {
*p++ = DHCP_USERCLASS;
*p++ = options->userclass_len;
memcpy (p, &options->userclass, options->userclass_len);
p += options->userclass_len;
}
if (options->classid_len > 0) {
*p++ = DHCP_CLASSID;
*p++ = options->classid_len;
memcpy (p, options->classid, options->classid_len);
p += options->classid_len;
}
}
*p++ = DHCP_CLIENTID;
if (options->clientid_len > 0) {
*p++ = options->clientid_len + 1;
*p++ = 0; /* string */
memcpy (p, options->clientid, options->clientid_len);
p += options->clientid_len;
#ifdef ENABLE_DUID
} else if (iface->duid && options->clientid_len != -1) {
*p++ = iface->duid_length + 5;
*p++ = 255; /* RFC 4361 */
/* IAID is 4 bytes, so if the interface name is 4 bytes then use it */
if (strlen (iface->name) == 4) {
memcpy (p, iface->name, 4);
} else {
/* Name isn't 4 bytes, so use the index */
ul = htonl (if_nametoindex (iface->name));
memcpy (p, &ul, 4);
}
p += 4;
memcpy (p, iface->duid, iface->duid_length);
p += iface->duid_length;
#endif
} else {
*p++ = iface->hwlen + 1;
*p++ = iface->family;
memcpy (p, iface->hwaddr, iface->hwlen);
p += iface->hwlen;
}
*p++ = DHCP_END;
#ifdef BOOTP_MESSAGE_LENTH_MIN
/* Some crappy DHCP servers think they have to obey the BOOTP minimum
* messag length. They are wrong, but we should still cater for them */
while (p - m < BOOTP_MESSAGE_LENTH_MIN)
*p++ = DHCP_PAD;
#endif
message_length = p - m;
packet = xmalloc (sizeof (struct udp_dhcp_packet));
memset (packet, 0, sizeof (struct udp_dhcp_packet));
make_dhcp_packet (packet, (unsigned char *) message, message_length,
from, to);
free (message);
logger (LOG_DEBUG, "sending %s with xid 0x%lx",
dhcp_message[(int) type], xid);
retval = send_packet (iface, ETHERTYPE_IP, (unsigned char *) packet,
message_length + sizeof (struct ip) +
sizeof (struct udphdr));
free (packet);
return (retval);
}
