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/*
* Copyright (c) 2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <parc/assert/parc_Assert.h>
#include <src/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#define WORKING_BUFFER_SIZE 15000
#define MAX_TRIES 3
#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
#include <src/core/forwarder.h>
#include <src/utils/interfaceSet.h>
#include <src/utils/addressList.h>
/**
* Returns the MTU for a named interface
*
* On linux, we get the MTU by opening a socket and reading SIOCGIFMTU
*
* @param [in] ifname Interface name (e.g. "eth0")
*
* @retval number The MTU in bytes
*
* Example:
* @code
* <#example#>
* @endcode
*/
static int getMtu(const char *ifname) {
PIP_ADAPTER_ADDRESSES pAddresses = NULL;
PIP_ADAPTER_ADDRESSES pCurrAddresses = NULL;
ULONG outBufLen = 0;
ULONG flags = GAA_FLAG_INCLUDE_PREFIX;
ULONG family = AF_UNSPEC;
DWORD dwSize = 0;
DWORD dwRetVal = 0;
ULONG Iterations = 0;
do {
pAddresses = (IP_ADAPTER_ADDRESSES *)MALLOC(outBufLen);
if (pAddresses == NULL) {
printf("Memory allocation failed for IP_ADAPTER_ADDRESSES struct\n");
exit(1);
}
dwRetVal =
GetAdaptersAddresses(family, flags, NULL, pAddresses, &outBufLen);
if (dwRetVal == ERROR_BUFFER_OVERFLOW) {
FREE(pAddresses);
pAddresses = NULL;
} else {
break;
}
Iterations++;
} while ((dwRetVal == ERROR_BUFFER_OVERFLOW) && (Iterations < MAX_TRIES));
if (dwRetVal == NO_ERROR) {
pCurrAddresses = pAddresses;
while (pCurrAddresses) {
if (strcmp(pCurrAddresses->AdapterName, ifname)) {
int mtu = pCurrAddresses->Mtu;
if (pAddresses) {
FREE(pAddresses);
}
return mtu;
}
pCurrAddresses = pCurrAddresses->Next;
}
}
if (pAddresses) {
FREE(pAddresses);
}
return -1;
}
InterfaceSet *system_Interfaces(Forwarder *forwarder) {
InterfaceSet *set = interfaceSetCreate();
Logger *logger = forwarder_GetLogger(forwarder);
DWORD dwSize = 0;
DWORD dwRetVal = 0;
unsigned int i = 0;
// Set the flags to pass to GetAdaptersAddresses
ULONG flags = GAA_FLAG_INCLUDE_PREFIX;
// default to unspecified address family (both)
ULONG family = AF_UNSPEC;
LPVOID lpMsgBuf = NULL;
PIP_ADAPTER_ADDRESSES pAddresses = NULL;
ULONG outBufLen = 0;
ULONG Iterations = 0;
PIP_ADAPTER_ADDRESSES pCurrAddresses = NULL;
PIP_ADAPTER_UNICAST_ADDRESS pUnicast = NULL;
PIP_ADAPTER_ANYCAST_ADDRESS pAnycast = NULL;
PIP_ADAPTER_MULTICAST_ADDRESS pMulticast = NULL;
IP_ADAPTER_DNS_SERVER_ADDRESS *pDnServer = NULL;
IP_ADAPTER_PREFIX *pPrefix = NULL;
outBufLen = WORKING_BUFFER_SIZE;
do {
pAddresses = (IP_ADAPTER_ADDRESSES *)MALLOC(outBufLen);
parcAssertNotNull(
pAddresses,
"Memory allocation failed for IP_ADAPTER_ADDRESSES struct\n");
dwRetVal =
GetAdaptersAddresses(family, flags, NULL, pAddresses, &outBufLen);
if (dwRetVal == ERROR_BUFFER_OVERFLOW) {
FREE(pAddresses);
pAddresses = NULL;
} else {
break;
}
Iterations++;
} while ((dwRetVal == ERROR_BUFFER_OVERFLOW) && (Iterations < MAX_TRIES));
if (dwRetVal == NO_ERROR) {
// If successful, output some information from the data we received
pCurrAddresses = pAddresses;
while (pCurrAddresses) {
if (pCurrAddresses->OperStatus == IfOperStatusUp) {
Interface *iface =
interfaceSetGetByName(set, pCurrAddresses->AdapterName);
if (iface == NULL) {
pMulticast = pCurrAddresses->FirstMulticastAddress;
if (pMulticast) {
for (i = 0; pMulticast != NULL; i++) pMulticast = pMulticast->Next;
}
iface = interfaceCreate(
pCurrAddresses->AdapterName,
forwarder_GetNextConnectionId(forwarder),
pCurrAddresses->IfType == IF_TYPE_SOFTWARE_LOOPBACK, i > 0,
pCurrAddresses->Mtu);
interfaceSetAdd(set, iface);
for (pUnicast = pCurrAddresses->FirstUnicastAddress; pUnicast != NULL;
pUnicast = pUnicast->Next) {
int family = pUnicast->Address.lpSockaddr->sa_family;
switch (family) {
case AF_INET: {
char *ip = inet_ntoa(
((struct sockaddr_in *)(pUnicast->Address.lpSockaddr))
->sin_addr);
Address *address = addressCreateFromInet(
(struct sockaddr_in *)(pUnicast->Address.lpSockaddr));
interfaceAddAddress(iface, address);
break;
}
case AF_INET6: {
char str[INET6_ADDRSTRLEN];
inet_ntop(
AF_INET6,
&((struct sockaddr_in6 *)(pUnicast->Address.lpSockaddr))
->sin6_addr,
str, INET6_ADDRSTRLEN);
Address *address = addressCreateFromInet6(
(struct sockaddr_in6 *)(pUnicast->Address.lpSockaddr));
interfaceAddAddress(iface, address);
break;
}
default:
break;
}
}
}
}
pCurrAddresses = pCurrAddresses->Next;
}
}
if (pAddresses) {
FREE(pAddresses);
}
return set;
}
Address *system_GetMacAddressByName(Forwarder *forwarder,
const char *interfaceName) {
return NULL;
}
unsigned system_InterfaceMtu(Forwarder *forwarder, const char *interfaceName) {
unsigned mtu = 0;
return mtu;
}
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