/*
* Note: This function reads the string without updating the index
*/
static
DWORD
DNSUnmarshallDomainNameAtOffset(
HANDLE hRecvBuffer,
WORD wOffset,
PDNS_DOMAIN_LABEL * ppDomainLabel
)
{
DWORD dwError = 0;
PDNS_DOMAIN_LABEL pLabel = NULL;
BYTE uLen = 0;
DWORD dwCurrent = 0;
PDNS_RECEIVEBUFFER_CONTEXT pRecvContext = NULL;
CHAR szLabel[65];
pRecvContext = (PDNS_RECEIVEBUFFER_CONTEXT)hRecvBuffer;
dwCurrent = wOffset;
memcpy(&uLen, pRecvContext->pRecvBuffer+dwCurrent, sizeof(char));
switch (uLen & 0xC0)
{
case 0x00:
dwCurrent++;
memset(szLabel, 0, sizeof(szLabel));
memcpy(szLabel, pRecvContext->pRecvBuffer+dwCurrent, uLen);
dwCurrent += uLen;
dwError = DNSAllocateMemory(
sizeof(DNS_DOMAIN_LABEL),
(PVOID *)&pLabel);
BAIL_ON_LWDNS_ERROR(dwError);
dwError = DNSAllocateString(szLabel, &pLabel->pszLabel);
BAIL_ON_LWDNS_ERROR(dwError);
break;
default:
dwError = LWDNS_ERROR_BAD_RESPONSE;
BAIL_ON_LWDNS_ERROR(dwError);
break;
}
*ppDomainLabel = pLabel;
cleanup:
return dwError;
error:
*ppDomainLabel = NULL;
if (pLabel)
{
DNSFreeLabel(pLabel);
}
goto cleanup;
}
static
DWORD
DNSGetInfoUsingGetIfAddrs(
PLW_DLINKED_LIST* ppInterfaceList
)
{
DWORD dwError = 0;
PLW_DLINKED_LIST pInterfaceList = NULL;
struct ifaddrs* pInterfaces = NULL;
struct ifaddrs* pIter = NULL;
PLW_INTERFACE_INFO pInterfaceInfo = NULL;
if (getifaddrs(&pInterfaces) < 0)
{
dwError = errno;
BAIL_ON_LWDNS_ERROR(dwError);
}
for (pIter = pInterfaces; pIter; pIter = pIter->ifa_next)
{
if (IsNullOrEmptyString(pIter->ifa_name))
{
LWDNS_LOG_VERBOSE("Skipping network interface with no name");
continue;
}
LWDNS_LOG_VERBOSE("Considering network interface [%s]",
pIter->ifa_name);
if (pIter->ifa_addr->sa_family != AF_INET)
{
if (pIter->ifa_addr->sa_family != AF_INET6)
{
LWDNS_LOG_VERBOSE("Skipping network interface [%s] because it is not AF_INET/AF_INET6 family", pIter->ifa_name);
continue;
}
}
if (!(pIter->ifa_flags & IFF_UP))
{
LWDNS_LOG_VERBOSE("Skipping in-active network interface [%s]",
pIter->ifa_name);
continue;
}
if (pIter->ifa_flags & IFF_LOOPBACK)
{
LWDNS_LOG_VERBOSE("Skipping loopback network interface [%s]",
pIter->ifa_name);
continue;
}
#ifdef LW_SKIP_ALIASED_INTERFACES
if (DNSInterfaceIsInList(pIter->ifa_name, pInterfaceList))
{
LWDNS_LOG_VERBOSE("Skipping aliased network interface [%s]",
pIter->ifa_name);
continue;
}
#endif
dwError = DNSAllocateMemory(
sizeof(LW_INTERFACE_INFO),
(PVOID*)&pInterfaceInfo);
BAIL_ON_LWDNS_ERROR(dwError);
dwError = DNSAllocateString(
pIter->ifa_name,
&pInterfaceInfo->pszName);
BAIL_ON_LWDNS_ERROR(dwError);
if (pIter->ifa_addr)
{
if (pIter->ifa_addr->sa_family == AF_INET)
{
memcpy(&pInterfaceInfo->ipAddr,
pIter->ifa_addr,
sizeof(*pIter->ifa_addr));
}
#ifndef HAVE_HPUX_OS
else if (pIter->ifa_addr->sa_family == AF_INET6)
{
pInterfaceInfo->bIPV6Enabled = TRUE;
memcpy(&pInterfaceInfo->ipv6Addr,
pIter->ifa_addr,
sizeof(struct sockaddr_in6));
}
#endif
}
pInterfaceInfo->dwFlags = pIter->ifa_flags;
dwError = LwDLinkedListAppend(
&pInterfaceList,
pInterfaceInfo);
BAIL_ON_LWDNS_ERROR(dwError);
LWDNS_LOG_VERBOSE("Added network interface [Name:%s] to list",
pInterfaceInfo->pszName);
pInterfaceInfo = NULL;
}
*ppInterfaceList = pInterfaceList;
cleanup:
if (pInterfaces)
{
freeifaddrs(pInterfaces);
}
return dwError;
error:
if (pInterfaceList)
{
DNSFreeInterfaceLinkedList(pInterfaceList);
}
if (pInterfaceInfo)
{
DNSFreeNetworkInterface(pInterfaceInfo);
}
*ppInterfaceList = NULL;
goto cleanup;
}
DWORD
DNSUnmarshallDomainName(
HANDLE hRecvBuffer,
PDNS_DOMAIN_NAME * ppDomainName
)
{
DWORD dwError = 0;
PDNS_DOMAIN_LABEL pLabel = NULL;
PDNS_DOMAIN_NAME pDomainName = NULL;
BYTE uLen = 0;
DWORD dwRead = 0;
BYTE uLen1, uLen2 = 0;
WORD wOffset = 0;
BOOLEAN bDone = FALSE;
dwError = DNSAllocateMemory(
sizeof(DNS_DOMAIN_NAME),
(PVOID *)&pDomainName);
BAIL_ON_LWDNS_ERROR(dwError);
do
{
dwError = DNSUnmarshallBuffer(
hRecvBuffer,
&uLen1,
sizeof(char),
&dwRead);
BAIL_ON_LWDNS_ERROR(dwError);
switch (uLen1 & 0xC0)
{
case 0xC0: /* pointer to string */
dwError = DNSUnmarshallBuffer(
hRecvBuffer,
&uLen2,
sizeof(char),
&dwRead);
BAIL_ON_LWDNS_ERROR(dwError);
wOffset = ntohs((((WORD)(uLen1) << 8)|uLen2) & 0x3FFF);
dwError = DNSUnmarshallDomainNameAtOffset(
hRecvBuffer,
wOffset,
&pLabel);
BAIL_ON_LWDNS_ERROR(dwError);
dwError = DNSAppendLabel(
pDomainName->pLabelList,
pLabel,
&pDomainName->pLabelList);
BAIL_ON_LWDNS_ERROR(dwError);
pLabel = NULL;
break;
case 0x00: /* string component */
{
CHAR szLabel[65];
dwError = DNSReceiveBufferMoveBackIndex(hRecvBuffer, 1);
BAIL_ON_LWDNS_ERROR(dwError);
dwError = DNSUnmarshallBuffer(
hRecvBuffer,
&uLen,
sizeof(char),
&dwRead);
BAIL_ON_LWDNS_ERROR(dwError);
if (uLen == 0)
{
bDone = TRUE;
break;
}
memset(szLabel, 0, sizeof(szLabel));
dwError = DNSUnmarshallBuffer(
hRecvBuffer,
(PBYTE)szLabel,
uLen,
&dwRead);
BAIL_ON_LWDNS_ERROR(dwError);
dwError = DNSAllocateMemory(
sizeof(DNS_DOMAIN_LABEL),
(PVOID *)&pLabel);
BAIL_ON_LWDNS_ERROR(dwError);
dwError = DNSAllocateString(szLabel, &pLabel->pszLabel);
BAIL_ON_LWDNS_ERROR(dwError);
dwError = DNSAppendLabel(
pDomainName->pLabelList,
pLabel,
&pDomainName->pLabelList);
BAIL_ON_LWDNS_ERROR(dwError);
pLabel = NULL;
}
break;
default: /* unexpected */
dwError = LWDNS_ERROR_BAD_RESPONSE;
BAIL_ON_LWDNS_ERROR(dwError);
break;
}
} while (!bDone);
*ppDomainName = pDomainName;
cleanup:
return(dwError);
error:
if (pDomainName)
{
DNSFreeDomainName(pDomainName);
}
if (pLabel)
{
DNSFreeLabel(pLabel);
}
*ppDomainName = NULL;
goto cleanup;
}
