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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 <ifaddrs.h>
#include <src/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <sys/socket.h>
#include <parc/assert/parc_Assert.h>
#include <src/utils/interfaceSet.h>
#include <src/core/forwarder.h>
#include <src/core/system.h>
InterfaceSet *system_Interfaces(Forwarder *forwarder) {
InterfaceSet *set = interfaceSetCreate();
// 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;
}
// This assumes the LINK address comes first so we can get the MTU
// when the interface is created.
Interface *iface = interfaceSetGetByName(set, next->ifa_name);
if (iface == NULL) {
unsigned mtu = 0;
if (next->ifa_data != NULL) {
struct if_data *ifdata = (struct if_data *)next->ifa_data;
mtu = ifdata->ifi_mtu;
}
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_LINK: {
struct sockaddr_dl *addr_dl = (struct sockaddr_dl *)next->ifa_addr;
// skip links with 0-length address
if (addr_dl->sdl_alen > 0) {
// addr_dl->sdl_data[12] contains the interface name followed by the
// MAC address, so need to offset in to the array past the interface
// name.
Address *address = addressCreateFromLink(
(uint8_t *)&addr_dl->sdl_data[addr_dl->sdl_nlen],
addr_dl->sdl_alen);
interfaceAddAddress(iface, address);
}
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;
if (interfaceName) {
InterfaceSet *interfaceSet = system_Interfaces(forwarder);
Interface *interface = interfaceSetGetByName(interfaceSet, interfaceName);
if (interface) {
mtu = interfaceGetMTU(interface);
}
interfaceSetDestroy(&interfaceSet);
}
return mtu;
}
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