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[DHCPCSRV] Send an ARP request to check if an automatic private address is available

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This commit is contained in:
Eric Kohl 2021-05-24 15:18:58 +02:00
parent 894cc4ac0c
commit 2047cf3613
1 changed files with 36 additions and 12 deletions
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48
base/services/dhcpcsvc/dhcp/dhclient.c
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@ -1071,26 +1071,50 @@ state_panic(void *ipp)
struct interface_info *ip = ipp;
uint16_t address_low;
int i;
PDHCP_ADAPTER Adapter = AdapterFindInfo(ip);
IPAddr IpAddress;
ULONG Buffer[20];
ULONG BufferSize;
DWORD ret;
PDHCP_ADAPTER Adapter = AdapterFindInfo(ip);
note("No DHCPOFFERS received.");
if (!Adapter->NteContext)
{
/* Generate an automatic private address */
DbgPrint("DHCPCSVC: Failed to receive a response from a DHCP server. An automatic private address will be assigned.\n");
if (!Adapter->NteContext)
{
/* Generate an automatic private address */
DbgPrint("DHCPCSVC: Failed to receive a response from a DHCP server. An automatic private address will be assigned.\n");
/* FIXME: The address generation code sucks */
srand(0);
/* FIXME: The address generation code sucks */
srand(0);
for (;;)
{
address_low = rand();
for (i = 0; i < ip->hw_address.hlen; i++)
address_low += ip->hw_address.haddr[i];
AddIPAddress(htonl(0xA9FE0000 | address_low), //169.254.X.X
htonl(0xFFFF0000), //255.255.0.0
Adapter->IfMib.dwIndex,
&Adapter->NteContext,
&Adapter->NteInstance);
IpAddress = htonl(0xA9FE0000 | address_low); // 169.254.X.X
/* Send an ARP request to check if the IP address is already in use */
BufferSize = sizeof(Buffer);
ret = SendARP(IpAddress,
IpAddress,
Buffer,
&BufferSize);
DH_DbgPrint(MID_TRACE,("DHCPCSVC: SendARP returned %lu\n", ret));
if (ret != 0)
{
/* The IP address is not in use */
DH_DbgPrint(MID_TRACE,("DHCPCSVC: Using automatic private address\n"));
AddIPAddress(IpAddress,
htonl(0xFFFF0000), // 255.255.0.0
Adapter->IfMib.dwIndex,
&Adapter->NteContext,
&Adapter->NteInstance);
return;
}
}
}
}
void