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/*
* Copyright (c) 2017-2019 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 <errno.h>
#include <src/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
//#define __USE_MISC
#include <net/if.h>
// to get the list of arp types
#include <net/if_arp.h>
// for the mac address
#include <netpacket/packet.h>
#include <src/core/forwarder.h>
#include <src/utils/interfaceSet.h>
#include <parc/assert/parc_Assert.h>
#include "ifaddrs.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) {
struct ifreq ifr;
int fd;
fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
strcpy(ifr.ifr_name, ifname);
ioctl(fd, SIOCGIFMTU, &ifr);
close(fd);
return ifr.ifr_mtu;
}
InterfaceSet *system_Interfaces(Forwarder *forwarder) {
InterfaceSet *set = interfaceSetCreate();
Logger *logger = forwarder_GetLogger(forwarder);
// this is the dynamically allocated head of the list
struct ifaddrs *ifaddr;
int failure = getifaddrs(&ifaddr);
parcAssertFalse(failure, "Error getifaddrs: (%d) %s", errno, strerror(errno));
struct ifaddrs *next;
for (next = ifaddr; next != NULL; next = next->ifa_next) {
if ((next->ifa_addr == NULL) || ((next->ifa_flags & IFF_UP) == 0)) {
continue;
}
Interface *iface = interfaceSetGetByName(set, next->ifa_name);
if (iface == NULL) {
unsigned mtu = (unsigned)getMtu(next->ifa_name);
iface = interfaceCreate(
next->ifa_name, forwarder_GetNextConnectionId(forwarder),
next->ifa_flags & IFF_LOOPBACK, next->ifa_flags & IFF_MULTICAST, mtu);
interfaceSetAdd(set, iface);
}
int family = next->ifa_addr->sa_family;
switch (family) {
case AF_INET: {
Address *address =
addressCreateFromInet((struct sockaddr_in *)next->ifa_addr);
interfaceAddAddress(iface, address);
break;
}
case AF_INET6: {
Address *address =
addressCreateFromInet6((struct sockaddr_in6 *)next->ifa_addr);
interfaceAddAddress(iface, address);
break;
}
case AF_PACKET: {
struct sockaddr_ll *addr_ll = (struct sockaddr_ll *)next->ifa_addr;
if (logger_IsLoggable(logger, LoggerFacility_IO, PARCLogLevel_Debug)) {
logger_Log(logger, LoggerFacility_IO, PARCLogLevel_Debug, __func__,
"sockaddr_ll family %d proto %d ifindex %d hatype %d "
"pkttype %d halen %d",
addr_ll->sll_family, addr_ll->sll_protocol,
addr_ll->sll_ifindex, addr_ll->sll_hatype,
addr_ll->sll_pkttype, addr_ll->sll_halen);
}
switch (addr_ll->sll_hatype) {
// list of the ARP hatypes we can extract a MAC address from
case ARPHRD_ETHER:
// fallthrough
case ARPHRD_IEEE802: {
Address *address = addressCreateFromLink(
(uint8_t *)addr_ll->sll_addr, addr_ll->sll_halen);
interfaceAddAddress(iface, address);
break;
}
default:
break;
}
break;
}
}
}
freeifaddrs(ifaddr);
return set;
}
Address *system_GetMacAddressByName(Forwarder *forwarder,
const char *interfaceName) {
Address *linkAddress = NULL;
InterfaceSet *interfaceSet = system_Interfaces(forwarder);
Interface *interface = interfaceSetGetByName(interfaceSet, interfaceName);
if (interface) {
const AddressList *addressList = interfaceGetAddresses(interface);
size_t length = addressListLength(addressList);
for (size_t i = 0; i < length && !linkAddress; i++) {
const Address *a = addressListGetItem(addressList, i);
if (addressGetType(a) == ADDR_LINK) {
linkAddress = addressCopy(a);
}
}
}
interfaceSetDestroy(&interfaceSet);
return linkAddress;
}
unsigned system_InterfaceMtu(Forwarder *forwarder, const char *interfaceName) {
unsigned mtu = 0;
InterfaceSet *interfaceSet = system_Interfaces(forwarder);
Interface *interface = interfaceSetGetByName(interfaceSet, interfaceName);
if (interface) {
mtu = interfaceGetMTU(interface);
}
interfaceSetDestroy(&interfaceSet);
return mtu;
}
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