426 lines
13 KiB
C
426 lines
13 KiB
C
/* $Id: getgateway.c,v 1.13 2009/03/10 10:15:31 nanard Exp $ */
|
|
/* libnatpmp
|
|
* Copyright (c) 2007-2008, Thomas BERNARD <miniupnp@free.fr>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#ifndef WIN32
|
|
#include <netinet/in.h>
|
|
#endif
|
|
#ifndef _MSC_VER
|
|
#include <sys/param.h>
|
|
#endif
|
|
/* There is no portable method to get the default route gateway.
|
|
* So below are three differents functions implementing this.
|
|
* Parsing /proc/net/route is for linux.
|
|
* sysctl is the way to access such informations on BSD systems.
|
|
* Many systems should provide route information through raw PF_ROUTE
|
|
* sockets. */
|
|
#ifdef __linux__
|
|
#define USE_PROC_NET_ROUTE
|
|
#undef USE_SOCKET_ROUTE
|
|
#undef USE_SYSCTL_NET_ROUTE
|
|
#endif
|
|
|
|
#ifdef BSD
|
|
#undef USE_PROC_NET_ROUTE
|
|
#define USE_SOCKET_ROUTE
|
|
#undef USE_SYSCTL_NET_ROUTE
|
|
#endif
|
|
|
|
#ifdef __APPLE__
|
|
#undef USE_PROC_NET_ROUTE
|
|
#undef USE_SOCKET_ROUTE
|
|
#define USE_SYSCTL_NET_ROUTE
|
|
#endif
|
|
|
|
#if ((defined(sun) || defined(__sun)) && defined(__SVR4))
|
|
#undef USE_PROC_NET_ROUTE
|
|
#define USE_SOCKET_ROUTE
|
|
#undef USE_SYSCTL_NET_ROUTE
|
|
#endif
|
|
|
|
#ifdef WIN32
|
|
#undef USE_PROC_NET_ROUTE
|
|
#undef USE_SOCKET_ROUTE
|
|
#undef USE_SYSCTL_NET_ROUTE
|
|
#define USE_WIN32_CODE
|
|
#endif
|
|
|
|
#ifdef USE_SYSCTL_NET_ROUTE
|
|
#include <stdlib.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/socket.h>
|
|
#include <net/route.h>
|
|
#endif
|
|
#ifdef USE_SOCKET_ROUTE
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <sys/socket.h>
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
#endif
|
|
#ifdef WIN32
|
|
#include <unknwn.h>
|
|
#include <winreg.h>
|
|
#define MAX_KEY_LENGTH 255
|
|
#define MAX_VALUE_LENGTH 16383
|
|
#endif
|
|
#include "getgateway.h"
|
|
|
|
#ifndef WIN32
|
|
#define SUCCESS (0)
|
|
#define FAILED (-1)
|
|
#endif
|
|
|
|
#ifdef USE_PROC_NET_ROUTE
|
|
int getdefaultgateway(in_addr_t * addr)
|
|
{
|
|
unsigned long d, g;
|
|
char buf[256];
|
|
int line = 0;
|
|
FILE * f;
|
|
char * p;
|
|
f = fopen("/proc/net/route", "r");
|
|
if(!f)
|
|
return FAILED;
|
|
while(fgets(buf, sizeof(buf), f)) {
|
|
if(line > 0) {
|
|
p = buf;
|
|
while(*p && !isspace(*p))
|
|
p++;
|
|
while(*p && isspace(*p))
|
|
p++;
|
|
if(sscanf(p, "%lx%lx", &d, &g)==2) {
|
|
if(d == 0) { /* default */
|
|
*addr = g;
|
|
fclose(f);
|
|
return SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
line++;
|
|
}
|
|
/* default route not found ! */
|
|
if(f)
|
|
fclose(f);
|
|
return FAILED;
|
|
}
|
|
#endif /* #ifdef USE_PROC_NET_ROUTE */
|
|
|
|
|
|
#ifdef USE_SYSCTL_NET_ROUTE
|
|
|
|
#define ROUNDUP(a) \
|
|
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
|
|
|
|
int getdefaultgateway(in_addr_t * addr)
|
|
{
|
|
#if 0
|
|
/* net.route.0.inet.dump.0.0 ? */
|
|
int mib[] = {CTL_NET, PF_ROUTE, 0, AF_INET,
|
|
NET_RT_DUMP, 0, 0/*tableid*/};
|
|
#endif
|
|
/* net.route.0.inet.flags.gateway */
|
|
int mib[] = {CTL_NET, PF_ROUTE, 0, AF_INET,
|
|
NET_RT_FLAGS, RTF_GATEWAY};
|
|
size_t l;
|
|
char * buf, * p;
|
|
struct rt_msghdr * rt;
|
|
struct sockaddr * sa;
|
|
struct sockaddr * sa_tab[RTAX_MAX];
|
|
int i;
|
|
int r = FAILED;
|
|
if(sysctl(mib, sizeof(mib)/sizeof(int), 0, &l, 0, 0) < 0) {
|
|
return FAILED;
|
|
}
|
|
if(l>0) {
|
|
buf = malloc(l);
|
|
if(sysctl(mib, sizeof(mib)/sizeof(int), buf, &l, 0, 0) < 0) {
|
|
free(buf);
|
|
return FAILED;
|
|
}
|
|
for(p=buf; p<buf+l; p+=rt->rtm_msglen) {
|
|
rt = (struct rt_msghdr *)p;
|
|
sa = (struct sockaddr *)(rt + 1);
|
|
for(i=0; i<RTAX_MAX; i++) {
|
|
if(rt->rtm_addrs & (1 << i)) {
|
|
sa_tab[i] = sa;
|
|
sa = (struct sockaddr *)((char *)sa + ROUNDUP(sa->sa_len));
|
|
} else {
|
|
sa_tab[i] = NULL;
|
|
}
|
|
}
|
|
if( ((rt->rtm_addrs & (RTA_DST|RTA_GATEWAY)) == (RTA_DST|RTA_GATEWAY))
|
|
&& sa_tab[RTAX_DST]->sa_family == AF_INET
|
|
&& sa_tab[RTAX_GATEWAY]->sa_family == AF_INET) {
|
|
if(((struct sockaddr_in *)sa_tab[RTAX_DST])->sin_addr.s_addr == 0) {
|
|
*addr = ((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr;
|
|
r = SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
free(buf);
|
|
}
|
|
return r;
|
|
}
|
|
#endif /* #ifdef USE_SYSCTL_NET_ROUTE */
|
|
|
|
|
|
#ifdef USE_SOCKET_ROUTE
|
|
/* Thanks to Darren Kenny for this code */
|
|
#define NEXTADDR(w, u) \
|
|
if (rtm_addrs & (w)) {\
|
|
l = sizeof(struct sockaddr); memmove(cp, &(u), l); cp += l;\
|
|
}
|
|
|
|
#define rtm m_rtmsg.m_rtm
|
|
|
|
struct {
|
|
struct rt_msghdr m_rtm;
|
|
char m_space[512];
|
|
} m_rtmsg;
|
|
|
|
int getdefaultgateway(in_addr_t *addr)
|
|
{
|
|
int s, seq, l, rtm_addrs, i;
|
|
pid_t pid;
|
|
struct sockaddr so_dst, so_mask;
|
|
char *cp = m_rtmsg.m_space;
|
|
struct sockaddr *gate = NULL, *sa;
|
|
struct rt_msghdr *msg_hdr;
|
|
|
|
pid = getpid();
|
|
seq = 0;
|
|
rtm_addrs = RTA_DST | RTA_NETMASK;
|
|
|
|
memset(&so_dst, 0, sizeof(so_dst));
|
|
memset(&so_mask, 0, sizeof(so_mask));
|
|
memset(&rtm, 0, sizeof(struct rt_msghdr));
|
|
|
|
rtm.rtm_type = RTM_GET;
|
|
rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
|
|
rtm.rtm_version = RTM_VERSION;
|
|
rtm.rtm_seq = ++seq;
|
|
rtm.rtm_addrs = rtm_addrs;
|
|
|
|
so_dst.sa_family = AF_INET;
|
|
so_mask.sa_family = AF_INET;
|
|
|
|
NEXTADDR(RTA_DST, so_dst);
|
|
NEXTADDR(RTA_NETMASK, so_mask);
|
|
|
|
rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
|
|
|
|
s = socket(PF_ROUTE, SOCK_RAW, 0);
|
|
|
|
if (write(s, (char *)&m_rtmsg, l) < 0) {
|
|
close(s);
|
|
return FAILED;
|
|
}
|
|
|
|
do {
|
|
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
|
|
} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
|
|
|
|
close(s);
|
|
|
|
msg_hdr = &rtm;
|
|
|
|
cp = ((char *)(msg_hdr + 1));
|
|
if (msg_hdr->rtm_addrs) {
|
|
for (i = 1; i; i <<= 1)
|
|
if (i & msg_hdr->rtm_addrs) {
|
|
sa = (struct sockaddr *)cp;
|
|
if (i == RTA_GATEWAY )
|
|
gate = sa;
|
|
|
|
cp += sizeof(struct sockaddr);
|
|
}
|
|
} else {
|
|
return FAILED;
|
|
}
|
|
|
|
|
|
if (gate != NULL ) {
|
|
*addr = ((struct sockaddr_in *)gate)->sin_addr.s_addr;
|
|
return SUCCESS;
|
|
} else {
|
|
return FAILED;
|
|
}
|
|
}
|
|
#endif /* #ifdef USE_SOCKET_ROUTE */
|
|
|
|
#ifdef USE_WIN32_CODE
|
|
int getdefaultgateway(in_addr_t * addr)
|
|
{
|
|
HKEY networkCardsKey;
|
|
HKEY networkCardKey;
|
|
HKEY interfacesKey;
|
|
HKEY interfaceKey;
|
|
DWORD i = 0;
|
|
DWORD numSubKeys = 0;
|
|
TCHAR keyName[MAX_KEY_LENGTH];
|
|
DWORD keyNameLength = MAX_KEY_LENGTH;
|
|
BYTE keyValue[MAX_VALUE_LENGTH];
|
|
DWORD keyValueLength = MAX_VALUE_LENGTH;
|
|
DWORD keyValueType = REG_SZ;
|
|
BYTE gatewayValue[MAX_VALUE_LENGTH];
|
|
DWORD gatewayValueLength = MAX_VALUE_LENGTH;
|
|
DWORD gatewayValueType = REG_MULTI_SZ;
|
|
int done = 0;
|
|
|
|
char networkCardsPath[] = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards";
|
|
char interfacesPath[] = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces";
|
|
|
|
// The windows registry lists its primary network devices in the following location:
|
|
// HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkCards
|
|
//
|
|
// Each network device has its own subfolder, named with an index, with various properties:
|
|
// -NetworkCards
|
|
// -5
|
|
// -Description = Broadcom 802.11n Network Adapter
|
|
// -ServiceName = {E35A72F8-5065-4097-8DFE-C7790774EE4D}
|
|
// -8
|
|
// -Description = Marvell Yukon 88E8058 PCI-E Gigabit Ethernet Controller
|
|
// -ServiceName = {86226414-5545-4335-A9D1-5BD7120119AD}
|
|
//
|
|
// The above service name is the name of a subfolder within:
|
|
// HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
|
|
//
|
|
// There may be more subfolders in this interfaces path than listed in the network cards path above:
|
|
// -Interfaces
|
|
// -{3a539854-6a70-11db-887c-806e6f6e6963}
|
|
// -DhcpIPAddress = 0.0.0.0
|
|
// -[more]
|
|
// -{E35A72F8-5065-4097-8DFE-C7790774EE4D}
|
|
// -DhcpIPAddress = 10.0.1.4
|
|
// -DhcpDefaultGateway = 10.0.1.1
|
|
// -[more]
|
|
// -{86226414-5545-4335-A9D1-5BD7120119AD}
|
|
// -DhcpIpAddress = 10.0.1.5
|
|
// -DhcpDefaultGateay = 10.0.1.1
|
|
// -[more]
|
|
//
|
|
// In order to extract this information, we enumerate each network card, and extract the ServiceName value.
|
|
// This is then used to open the interface subfolder, and attempt to extract a DhcpDefaultGateway value.
|
|
// Once one is found, we're done.
|
|
//
|
|
// It may be possible to simply enumerate the interface folders until we find one with a DhcpDefaultGateway value.
|
|
// However, the technique used is the technique most cited on the web, and we assume it to be more correct.
|
|
|
|
if(ERROR_SUCCESS != RegOpenKeyEx(HKEY_LOCAL_MACHINE, // Open registry key or predifined key
|
|
networkCardsPath, // Name of registry subkey to open
|
|
0, // Reserved - must be zero
|
|
KEY_READ, // Mask - desired access rights
|
|
&networkCardsKey)) // Pointer to output key
|
|
{
|
|
// Unable to open network cards keys
|
|
return -1;
|
|
}
|
|
|
|
if(ERROR_SUCCESS != RegOpenKeyEx(HKEY_LOCAL_MACHINE, // Open registry key or predefined key
|
|
interfacesPath, // Name of registry subkey to open
|
|
0, // Reserved - must be zero
|
|
KEY_READ, // Mask - desired access rights
|
|
&interfacesKey)) // Pointer to output key
|
|
{
|
|
// Unable to open interfaces key
|
|
RegCloseKey(networkCardsKey);
|
|
return -1;
|
|
}
|
|
|
|
// Figure out how many subfolders are within the NetworkCards folder
|
|
RegQueryInfoKey(networkCardsKey, NULL, NULL, NULL, &numSubKeys, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
|
|
|
|
//printf( "Number of subkeys: %u\n", (unsigned int)numSubKeys);
|
|
|
|
// Enumrate through each subfolder within the NetworkCards folder
|
|
for(i = 0; i < numSubKeys && !done; i++)
|
|
{
|
|
keyNameLength = MAX_KEY_LENGTH;
|
|
if(ERROR_SUCCESS == RegEnumKeyEx(networkCardsKey, // Open registry key
|
|
i, // Index of subkey to retrieve
|
|
keyName, // Buffer that receives the name of the subkey
|
|
&keyNameLength, // Variable that receives the size of the above buffer
|
|
NULL, // Reserved - must be NULL
|
|
NULL, // Buffer that receives the class string
|
|
NULL, // Variable that receives the size of the above buffer
|
|
NULL)) // Variable that receives the last write time of subkey
|
|
{
|
|
if(RegOpenKeyEx(networkCardsKey, keyName, 0, KEY_READ, &networkCardKey) == ERROR_SUCCESS)
|
|
{
|
|
keyValueLength = MAX_VALUE_LENGTH;
|
|
if(ERROR_SUCCESS == RegQueryValueEx(networkCardKey, // Open registry key
|
|
"ServiceName", // Name of key to query
|
|
NULL, // Reserved - must be NULL
|
|
&keyValueType, // Receives value type
|
|
keyValue, // Receives value
|
|
&keyValueLength)) // Receives value length in bytes
|
|
{
|
|
//printf("keyValue: %s\n", keyValue);
|
|
|
|
if(RegOpenKeyEx(interfacesKey, (char *)keyValue, 0, KEY_READ, &interfaceKey) == ERROR_SUCCESS)
|
|
{
|
|
gatewayValueLength = MAX_VALUE_LENGTH;
|
|
if(ERROR_SUCCESS == RegQueryValueEx(interfaceKey, // Open registry key
|
|
"DhcpDefaultGateway", // Name of key to query
|
|
NULL, // Reserved - must be NULL
|
|
&gatewayValueType, // Receives value type
|
|
gatewayValue, // Receives value
|
|
&gatewayValueLength)) // Receives value length in bytes
|
|
{
|
|
// Check to make sure it's a string
|
|
if(gatewayValueType == REG_MULTI_SZ || gatewayValueType == REG_SZ)
|
|
{
|
|
//printf("gatewayValue: %s\n", gatewayValue);
|
|
done = 1;
|
|
}
|
|
}
|
|
else if(ERROR_SUCCESS == RegQueryValueEx(interfaceKey, // Open registry key
|
|
"DefaultGateway", // Name of key to query
|
|
NULL, // Reserved - must be NULL
|
|
&gatewayValueType, // Receives value type
|
|
gatewayValue, // Receives value
|
|
&gatewayValueLength)) // Receives value length in bytes
|
|
{
|
|
// Check to make sure it's a string
|
|
if(gatewayValueType == REG_MULTI_SZ || gatewayValueType == REG_SZ)
|
|
{
|
|
//printf("gatewayValue: %s\n", gatewayValue);
|
|
done = 1;
|
|
}
|
|
}
|
|
RegCloseKey(interfaceKey);
|
|
}
|
|
}
|
|
RegCloseKey(networkCardKey);
|
|
}
|
|
}
|
|
}
|
|
|
|
RegCloseKey(interfacesKey);
|
|
RegCloseKey(networkCardsKey);
|
|
|
|
if(done)
|
|
{
|
|
*addr = inet_addr((char *)gatewayValue);
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
#endif /* #ifdef USE_WIN32_CODE */
|
|
|