MMDVMHost-Private/NetworkInfo.cpp

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/*
* Copyright (C) 2017 by Lieven De Samblanx ON7LDS
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "NetworkInfo.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
#include <ctime>
#include <clocale>
#include <sys/types.h>
#if !defined(_WIN32) && !defined(_WIN64)
#include <ifaddrs.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#else
#include <ws2tcpip.h>
#include <iphlpapi.h>
#pragma comment(lib, "iphlpapi.lib")
#ifndef NO_ERROR
#define NO_ERROR 0
#endif
#ifndef ERROR_BUFFER_OVERFLOW
#define ERROR_BUFFER_OVERFLOW 111
#endif
#ifndef ERROR_INSUFFICIENT_BUFFER
#define ERROR_INSUFFICIENT_BUFFER 122
#endif
#endif
CNetworkInfo::CNetworkInfo()
{
}
CNetworkInfo::~CNetworkInfo()
{
}
void CNetworkInfo::getNetworkInterface(unsigned char* info)
{
LogInfo("Interfaces Info");
::strcpy((char*)info, "(address unknown)");
#if !defined(_WIN32) && !defined(_WIN64)
const unsigned int IFLISTSIZ = 25U;
FILE* fp = ::fopen("/proc/net/route" , "r");
if (fp == NULL) {
LogError("Unabled to open /proc/route");
return;
}
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char* dflt = NULL;
char line[100U];
while (::fgets(line, 100U, fp)) {
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char* p1 = strtok(line , " \t");
char* p2 = strtok(NULL , " \t");
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if (p1 != NULL && p2 != NULL) {
if (::strcmp(p2, "00000000") == 0) {
dflt = p1;
break;
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}
}
}
::fclose(fp);
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if (dflt == NULL) {
LogError("Unable to find the default route");
return;
}
char interfacelist[IFLISTSIZ][50+INET6_ADDRSTRLEN];
for (unsigned int n = 0U; n < IFLISTSIZ; n++)
interfacelist[n][0] = 0;
struct ifaddrs* ifaddr;
if (::getifaddrs(&ifaddr) == -1) {
LogError("getifaddrs failure");
return;
}
unsigned int ifnr = 0U;
for (struct ifaddrs* ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL)
continue;
int family = ifa->ifa_addr->sa_family;
if (family == AF_INET || family == AF_INET6) {
char host[NI_MAXHOST];
int s = ::getnameinfo(ifa->ifa_addr, family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if (s != 0) {
LogError("getnameinfo() failed: %s\n", gai_strerror(s));
continue;
}
if (family == AF_INET) {
::sprintf(interfacelist[ifnr], "%s:%s", ifa->ifa_name, host);
LogInfo(" IPv4: %s", interfacelist[ifnr]);
} else {
::sprintf(interfacelist[ifnr], "%s:%s", ifa->ifa_name, host);
LogInfo(" IPv6: %s", interfacelist[ifnr]);
}
ifnr++;
}
}
::freeifaddrs(ifaddr);
LogInfo(" Default interface is : %s" , dflt);
for (unsigned int n = 0U; n < ifnr; n++) {
char* p = ::strchr(interfacelist[n], '%');
if (p != NULL)
*p = 0;
if (::strstr(interfacelist[n], dflt) != 0) {
::strcpy((char*)info, interfacelist[n]);
break;
}
}
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LogInfo(" IP to show: %s", info);
#else
PMIB_IPFORWARDTABLE pIpForwardTable = (MIB_IPFORWARDTABLE *)::malloc(sizeof(MIB_IPFORWARDTABLE));
if (pIpForwardTable == NULL) {
LogError("Error allocating memory");
return;
}
DWORD dwSize = 0U;
if (::GetIpForwardTable(pIpForwardTable, &dwSize, 0) == ERROR_INSUFFICIENT_BUFFER) {
::free(pIpForwardTable);
pIpForwardTable = (MIB_IPFORWARDTABLE *)::malloc(dwSize);
if (pIpForwardTable == NULL) {
LogError("Error allocating memory");
return;
}
}
DWORD ret = ::GetIpForwardTable(pIpForwardTable, &dwSize, 0);
if (ret != NO_ERROR) {
::free(pIpForwardTable);
LogError("GetIpForwardTable failed.");
return;
}
DWORD found = 999U;
for (DWORD i = 0U; i < pIpForwardTable->dwNumEntries; i++) {
if (pIpForwardTable->table[i].dwForwardDest == 0U) {
found = i;
break;
}
}
if (found == 999U) {
::free(pIpForwardTable);
LogError("Unable to find the default destination in the routing table.");
return;
}
DWORD ifnr = pIpForwardTable->table[found].dwForwardIfIndex;
::free(pIpForwardTable);
PIP_ADAPTER_INFO pAdapterInfo = (IP_ADAPTER_INFO *)::malloc(sizeof(IP_ADAPTER_INFO));
if (pAdapterInfo == NULL) {
LogError("Error allocating memory");
return;
}
ULONG buflen = sizeof(IP_ADAPTER_INFO);
if (::GetAdaptersInfo(pAdapterInfo, &buflen) == ERROR_BUFFER_OVERFLOW) {
::free(pAdapterInfo);
pAdapterInfo = (IP_ADAPTER_INFO *)::malloc(buflen);
if (pAdapterInfo == NULL) {
LogError("Error allocating memory");
return;
}
}
if (::GetAdaptersInfo(pAdapterInfo, &buflen) != NO_ERROR) {
::free(pAdapterInfo);
LogError("Call to GetAdaptersInfo failed.");
return;
}
PIP_ADAPTER_INFO pAdapter = pAdapterInfo;
while (pAdapter != NULL) {
LogInfo(" IP : %s", pAdapter->IpAddressList.IpAddress.String);
if (pAdapter->Index == ifnr)
::strcpy((char*)info, pAdapter->IpAddressList.IpAddress.String);
pAdapter = pAdapter->Next;
}
::free(pAdapterInfo);
LogInfo(" IP to show: %s", info);
#endif
}