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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "pal_config.h"
#include "pal_interfaceaddresses.h"
#include "pal_maphardwaretype.h"
#include "pal_utilities.h"
#include <sys/types.h>
#include <assert.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#if HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#if defined(AF_PACKET)
#include <linux/if_packet.h>
#elif defined(AF_LINK)
#include <net/if_dl.h>
#include <net/if_types.h>
#else
#error System must have AF_PACKET or AF_LINK.
#endif
#if HAVE_RT_MSGHDR
#include <net/route.h>
#endif
extern "C" int32_t SystemNative_EnumerateInterfaceAddresses(IPv4AddressFound onIpv4Found,
IPv6AddressFound onIpv6Found,
LinkLayerAddressFound onLinkLayerFound)
{
ifaddrs* headAddr;
if (getifaddrs(&headAddr) == -1)
{
return -1;
}
for (ifaddrs* current = headAddr; current != nullptr; current = current->ifa_next)
{
uint32_t interfaceIndex = if_nametoindex(current->ifa_name);
// ifa_name may be an aliased interface name.
// Use if_indextoname to map back to the true device name.
char actualName[IF_NAMESIZE];
char* result = if_indextoname(interfaceIndex, actualName);
if (result == nullptr)
{
freeifaddrs(headAddr);
return -1;
}
assert(result == actualName);
int family = current->ifa_addr->sa_family;
if (family == AF_INET)
{
if (onIpv4Found != nullptr)
{
// IP Address
IpAddressInfo iai;
memset(&iai, 0, sizeof(IpAddressInfo));
iai.InterfaceIndex = interfaceIndex;
iai.NumAddressBytes = NUM_BYTES_IN_IPV4_ADDRESS;
sockaddr_in* sain = reinterpret_cast<sockaddr_in*>(current->ifa_addr);
memcpy(iai.AddressBytes, &sain->sin_addr.s_addr, sizeof(sain->sin_addr.s_addr));
// Net Mask
IpAddressInfo maskInfo;
memset(&maskInfo, 0, sizeof(IpAddressInfo));
maskInfo.InterfaceIndex = interfaceIndex;
maskInfo.NumAddressBytes = NUM_BYTES_IN_IPV4_ADDRESS;
sockaddr_in* mask_sain = reinterpret_cast<sockaddr_in*>(current->ifa_netmask);
memcpy(maskInfo.AddressBytes, &mask_sain->sin_addr.s_addr, sizeof(mask_sain->sin_addr.s_addr));
onIpv4Found(actualName, &iai, &maskInfo);
}
}
else if (family == AF_INET6)
{
if (onIpv6Found != nullptr)
{
IpAddressInfo iai;
memset(&iai, 0, sizeof(IpAddressInfo));
iai.InterfaceIndex = interfaceIndex;
iai.NumAddressBytes = NUM_BYTES_IN_IPV6_ADDRESS;
sockaddr_in6* sain6 = reinterpret_cast<sockaddr_in6*>(current->ifa_addr);
memcpy(iai.AddressBytes, sain6->sin6_addr.s6_addr, sizeof(sain6->sin6_addr.s6_addr));
uint32_t scopeId = sain6->sin6_scope_id;
onIpv6Found(actualName, &iai, &scopeId);
}
}
#if defined(AF_PACKET)
else if (family == AF_PACKET)
{
if (onLinkLayerFound != nullptr)
{
sockaddr_ll* sall = reinterpret_cast<sockaddr_ll*>(current->ifa_addr);
LinkLayerAddressInfo lla;
memset(&lla, 0, sizeof(LinkLayerAddressInfo));
lla.InterfaceIndex = interfaceIndex;
lla.NumAddressBytes = sall->sll_halen;
lla.HardwareType = MapHardwareType(sall->sll_hatype);
memcpy(&lla.AddressBytes, &sall->sll_addr, sall->sll_halen);
onLinkLayerFound(current->ifa_name, &lla);
}
}
#elif defined(AF_LINK)
else if (family == AF_LINK)
{
if (onLinkLayerFound != nullptr)
{
sockaddr_dl* sadl = reinterpret_cast<sockaddr_dl*>(current->ifa_addr);
LinkLayerAddressInfo lla = {
.InterfaceIndex = interfaceIndex,
.NumAddressBytes = sadl->sdl_alen,
.HardwareType = MapHardwareType(sadl->sdl_type),
};
memcpy(&lla.AddressBytes, reinterpret_cast<uint8_t*>(LLADDR(sadl)), sadl->sdl_alen);
onLinkLayerFound(current->ifa_name, &lla);
}
}
#endif
}
freeifaddrs(headAddr);
return 0;
}
#if HAVE_RT_MSGHDR
extern "C" int32_t SystemNative_EnumerateGatewayAddressesForInterface(uint32_t interfaceIndex, GatewayAddressFound onGatewayFound)
{
int routeDumpName[] = {CTL_NET, AF_ROUTE, 0, AF_INET, NET_RT_DUMP, 0};
size_t byteCount;
if (sysctl(routeDumpName, 6, nullptr, &byteCount, nullptr, 0) != 0)
{
return -1;
}
uint8_t* buffer = new uint8_t[byteCount];
while (sysctl(routeDumpName, 6, buffer, &byteCount, nullptr, 0) != 0)
{
delete[] buffer;
buffer = new uint8_t[byteCount];
}
rt_msghdr* hdr;
for (size_t i = 0; i < byteCount; i += hdr->rtm_msglen)
{
hdr = reinterpret_cast<rt_msghdr*>(&buffer[i]);
int flags = hdr->rtm_flags;
int isGateway = flags & RTF_GATEWAY;
int gatewayPresent = hdr->rtm_addrs & RTA_GATEWAY;
if (isGateway && gatewayPresent)
{
IpAddressInfo iai = {};
iai.InterfaceIndex = interfaceIndex;
iai.NumAddressBytes = NUM_BYTES_IN_IPV4_ADDRESS;
sockaddr_in* sain = reinterpret_cast<sockaddr_in*>(hdr + 1);
sain = sain + 1; // Skip over the first sockaddr, the destination address. The second is the gateway.
memcpy(iai.AddressBytes, &sain->sin_addr.s_addr, sizeof(sain->sin_addr.s_addr));
onGatewayFound(&iai);
}
}
delete[] buffer;
return 0;
}
#endif // HAVE_RT_MSGHDR
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