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[IPHLPAPI] Retrieve DHCP information from the registry

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This commit is contained in:
Eric Kohl 2025-04-18 19:51:59 +02:00
parent fa7890f39d
commit 3fe4b41f20
3 changed files with 88 additions and 37 deletions
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107
dll/win32/iphlpapi/dhcp_reactos.c
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@ -8,35 +8,94 @@
#include "iphlpapi_private.h"
DWORD APIENTRY DhcpRosGetAdapterInfo(DWORD AdapterIndex,
PBOOL DhcpEnabled,
PDWORD DhcpServer,
time_t *LeaseObtained,
time_t *LeaseExpires);
DWORD getDhcpInfoForAdapter(DWORD AdapterIndex,
PBOOL DhcpEnabled,
PDWORD DhcpServer,
time_t *LeaseObtained,
time_t *LeaseExpires)
DWORD
getDhcpInfoForAdapter(
DWORD AdapterIndex,
PIP_ADAPTER_INFO ptr)
{
DWORD Status, Version = 0;
const char *ifname = NULL;
HKEY hKeyInterfaces = NULL, hKeyInterface = NULL;
DWORD dwValue, dwSize, dwType;
DWORD ret = ERROR_SUCCESS;
Status = DhcpCApiInitialize(&Version);
if (Status != ERROR_SUCCESS)
ptr->DhcpEnabled = 0;
ptr->LeaseObtained = 0;
ptr->LeaseExpires = 0;
strcpy(ptr->DhcpServer.IpAddress.String, "");
ifname = getInterfaceNameByIndex(AdapterIndex);
if (!ifname)
return ERROR_OUTOFMEMORY;
ret = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
L"SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces",
0,
KEY_READ,
&hKeyInterfaces);
if (ret != ERROR_SUCCESS)
goto done;
ret = RegOpenKeyExA(hKeyInterfaces,
ifname,
0,
KEY_READ,
&hKeyInterface);
if (ret != ERROR_SUCCESS)
goto done;
dwSize = sizeof(ptr->DhcpEnabled);
ret = RegQueryValueExW(hKeyInterface,
L"EnableDHCP",
NULL,
&dwType,
(PBYTE)&ptr->DhcpEnabled,
&dwSize);
if (ret != ERROR_SUCCESS)
ptr->DhcpEnabled = 0;
if (ptr->DhcpEnabled != 0)
{
/* We assume that the DHCP service isn't running yet */
*DhcpEnabled = FALSE;
*DhcpServer = htonl(INADDR_NONE);
*LeaseObtained = 0;
*LeaseExpires = 0;
return ERROR_SUCCESS;
dwSize = sizeof(ptr->LeaseObtained);
ret = RegQueryValueExW(hKeyInterface,
L"LeaseObtainedTime",
NULL,
&dwType,
(PBYTE)&dwValue,
&dwSize);
if (ret == ERROR_SUCCESS)
ptr->LeaseObtained = (time_t)dwValue;
dwSize = sizeof(dwValue);
ret = RegQueryValueExW(hKeyInterface,
L"LeaseTerminatesTime",
NULL,
&dwType,
(PBYTE)&dwValue,
&dwSize);
if (ret == ERROR_SUCCESS)
ptr->LeaseExpires = (time_t)dwValue;
dwSize = sizeof(ptr->DhcpServer.IpAddress.String);
ret = RegQueryValueExA(hKeyInterface,
"DhcpServer",
NULL,
&dwType,
(PBYTE)&ptr->DhcpServer.IpAddress.String,
&dwSize);
if (ret != ERROR_SUCCESS)
strcpy(ptr->DhcpServer.IpAddress.String, "");
}
ret = ERROR_SUCCESS;
Status = DhcpRosGetAdapterInfo(AdapterIndex, DhcpEnabled, DhcpServer,
LeaseObtained, LeaseExpires);
done:
if (hKeyInterface)
RegCloseKey(hKeyInterface);
DhcpCApiCleanup();
if (hKeyInterfaces)
RegCloseKey(hKeyInterfaces);
return Status;
if (ifname)
consumeInterfaceName(ifname);
return ret;
}