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https://github.com/transmission/transmission
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408 lines
12 KiB
C
408 lines
12 KiB
C
/* $Id: getgateway.c,v 1.11 2008/07/02 23:56:11 nanard Exp $ */
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/* libnatpmp
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* Copyright (c) 2007-2008, Thomas BERNARD <miniupnp@free.fr>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <stdio.h>
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#include <ctype.h>
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#ifndef WIN32
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#include <netinet/in.h>
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#endif
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#include <sys/param.h>
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/* There is no portable method to get the default route gateway.
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* So below are three differents functions implementing this.
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* Parsing /proc/net/route is for linux.
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* sysctl is the way to access such informations on BSD systems.
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* Many systems should provide route information through raw PF_ROUTE
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* sockets. */
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#ifdef __linux__
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#define USE_PROC_NET_ROUTE
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#undef USE_SOCKET_ROUTE
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#undef USE_SYSCTL_NET_ROUTE
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#endif
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#ifdef BSD
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#undef USE_PROC_NET_ROUTE
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#define USE_SOCKET_ROUTE
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#undef USE_SYSCTL_NET_ROUTE
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#endif
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#ifdef __APPLE__
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#undef USE_PROC_NET_ROUTE
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#undef USE_SOCKET_ROUTE
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#define USE_SYSCTL_NET_ROUTE
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#endif
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#if (defined(sun) && defined(__SVR4))
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#undef USE_PROC_NET_ROUTE
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#define USE_SOCKET_ROUTE
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#undef USE_SYSCTL_NET_ROUTE
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#endif
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#ifdef WIN32
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#undef USE_PROC_NET_ROUTE
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#undef USE_SOCKET_ROUTE
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#undef USE_SYSCTL_NET_ROUTE
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#define USE_WIN32_CODE
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#endif
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#ifdef USE_SYSCTL_NET_ROUTE
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#include <stdlib.h>
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#include <sys/sysctl.h>
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#include <sys/socket.h>
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#include <net/route.h>
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#endif
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#ifdef USE_SOCKET_ROUTE
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#include <unistd.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/route.h>
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#endif
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#ifdef WIN32
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#include <unknwn.h>
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#include <winreg.h>
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#define MAX_KEY_LENGTH 255
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#define MAX_VALUE_LENGTH 16383
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#endif
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#include "getgateway.h"
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#ifndef WIN32
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#define SUCCESS (0)
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#define FAILED (-1)
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#endif
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#ifdef USE_PROC_NET_ROUTE
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int getdefaultgateway(in_addr_t * addr)
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{
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long d, g;
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char buf[256];
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int line = 0;
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FILE * f;
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char * p;
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f = fopen("/proc/net/route", "r");
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if(!f)
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return FAILED;
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while(fgets(buf, sizeof(buf), f)) {
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if(line > 0) {
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p = buf;
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while(*p && !isspace(*p))
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p++;
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while(*p && isspace(*p))
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p++;
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if(sscanf(p, "%lx%lx", &d, &g)==2) {
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if(d == 0) { /* default */
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*addr = g;
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fclose(f);
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return SUCCESS;
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}
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}
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}
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line++;
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}
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/* default route not found ! */
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if(f)
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fclose(f);
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return FAILED;
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}
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#endif /* #ifdef USE_PROC_NET_ROUTE */
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#ifdef USE_SYSCTL_NET_ROUTE
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#define ROUNDUP(a) \
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((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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int getdefaultgateway(in_addr_t * addr)
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{
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#if 0
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/* net.route.0.inet.dump.0.0 ? */
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int mib[] = {CTL_NET, PF_ROUTE, 0, AF_INET,
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NET_RT_DUMP, 0, 0/*tableid*/};
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#endif
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/* net.route.0.inet.flags.gateway */
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int mib[] = {CTL_NET, PF_ROUTE, 0, AF_INET,
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NET_RT_FLAGS, RTF_GATEWAY};
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size_t l;
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char * buf, * p;
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struct rt_msghdr * rt;
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struct sockaddr * sa;
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struct sockaddr * sa_tab[RTAX_MAX];
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int i;
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int r = FAILED;
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if(sysctl(mib, sizeof(mib)/sizeof(int), 0, &l, 0, 0) < 0) {
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return FAILED;
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}
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if(l>0) {
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buf = malloc(l);
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if(sysctl(mib, sizeof(mib)/sizeof(int), buf, &l, 0, 0) < 0) {
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return FAILED;
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}
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for(p=buf; p<buf+l; p+=rt->rtm_msglen) {
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rt = (struct rt_msghdr *)p;
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sa = (struct sockaddr *)(rt + 1);
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for(i=0; i<RTAX_MAX; i++) {
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if(rt->rtm_addrs & (1 << i)) {
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sa_tab[i] = sa;
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sa = (struct sockaddr *)((char *)sa + ROUNDUP(sa->sa_len));
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} else {
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sa_tab[i] = NULL;
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}
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}
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if( ((rt->rtm_addrs & (RTA_DST|RTA_GATEWAY)) == (RTA_DST|RTA_GATEWAY))
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&& sa_tab[RTAX_DST]->sa_family == AF_INET
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&& sa_tab[RTAX_GATEWAY]->sa_family == AF_INET) {
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if(((struct sockaddr_in *)sa_tab[RTAX_DST])->sin_addr.s_addr == 0) {
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*addr = ((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr;
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r = SUCCESS;
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}
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}
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}
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free(buf);
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}
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return r;
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}
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#endif /* #ifdef USE_SYSCTL_NET_ROUTE */
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#ifdef USE_SOCKET_ROUTE
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/* Thanks to Darren Kenny for this code */
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#define NEXTADDR(w, u) \
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if (rtm_addrs & (w)) {\
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l = sizeof(struct sockaddr); memmove(cp, &(u), l); cp += l;\
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}
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#define rtm m_rtmsg.m_rtm
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struct {
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struct rt_msghdr m_rtm;
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char m_space[512];
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} m_rtmsg;
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int getdefaultgateway(in_addr_t *addr)
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{
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int s, seq, l, rtm_addrs, i;
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pid_t pid;
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struct sockaddr so_dst, so_mask;
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char *cp = m_rtmsg.m_space;
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struct sockaddr *gate = NULL, *sa;
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struct rt_msghdr *msg_hdr;
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pid = getpid();
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seq = 0;
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rtm_addrs = RTA_DST | RTA_NETMASK;
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memset(&so_dst, 0, sizeof(so_dst));
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memset(&so_mask, 0, sizeof(so_mask));
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memset(&rtm, 0, sizeof(struct rt_msghdr));
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rtm.rtm_type = RTM_GET;
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rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
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rtm.rtm_version = RTM_VERSION;
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rtm.rtm_seq = ++seq;
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rtm.rtm_addrs = rtm_addrs;
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so_dst.sa_family = AF_INET;
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so_mask.sa_family = AF_INET;
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NEXTADDR(RTA_DST, so_dst);
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NEXTADDR(RTA_NETMASK, so_mask);
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rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
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s = socket(PF_ROUTE, SOCK_RAW, 0);
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if (write(s, (char *)&m_rtmsg, l) < 0) {
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close(s);
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return FAILED;
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}
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do {
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l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
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} while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
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close(s);
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msg_hdr = &rtm;
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cp = ((char *)(msg_hdr + 1));
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if (msg_hdr->rtm_addrs) {
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for (i = 1; i; i <<= 1)
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if (i & msg_hdr->rtm_addrs) {
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sa = (struct sockaddr *)cp;
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if (i == RTA_GATEWAY )
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gate = sa;
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cp += sizeof(struct sockaddr);
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}
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} else {
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return FAILED;
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}
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if (gate != NULL ) {
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*addr = ((struct sockaddr_in *)gate)->sin_addr.s_addr;
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return SUCCESS;
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} else {
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return FAILED;
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}
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}
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#endif /* #ifdef USE_SOCKET_ROUTE */
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#ifdef USE_WIN32_CODE
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int getdefaultgateway(in_addr_t * addr)
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{
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HKEY networkCardsKey;
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HKEY networkCardKey;
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HKEY interfacesKey;
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HKEY interfaceKey;
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DWORD i = 0;
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DWORD numSubKeys = 0;
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TCHAR keyName[MAX_KEY_LENGTH];
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DWORD keyNameLength = MAX_KEY_LENGTH;
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TCHAR keyValue[MAX_VALUE_LENGTH];
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DWORD keyValueLength = MAX_VALUE_LENGTH;
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DWORD keyValueType = REG_SZ;
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TCHAR gatewayValue[MAX_VALUE_LENGTH];
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DWORD gatewayValueLength = MAX_VALUE_LENGTH;
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DWORD gatewayValueType = REG_MULTI_SZ;
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int done = 0;
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char networkCardsPath[] = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards";
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char interfacesPath[] = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces";
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// The windows registry lists its primary network devices in the following location:
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// HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkCards
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//
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// Each network device has its own subfolder, named with an index, with various properties:
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// -NetworkCards
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// -5
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// -Description = Broadcom 802.11n Network Adapter
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// -ServiceName = {E35A72F8-5065-4097-8DFE-C7790774EE4D}
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// -8
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// -Description = Marvell Yukon 88E8058 PCI-E Gigabit Ethernet Controller
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// -ServiceName = {86226414-5545-4335-A9D1-5BD7120119AD}
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//
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// The above service name is the name of a subfolder within:
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// HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
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//
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// There may be more subfolders in this interfaces path than listed in the network cards path above:
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// -Interfaces
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// -{3a539854-6a70-11db-887c-806e6f6e6963}
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// -DhcpIPAddress = 0.0.0.0
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// -[more]
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// -{E35A72F8-5065-4097-8DFE-C7790774EE4D}
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// -DhcpIPAddress = 10.0.1.4
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// -DhcpDefaultGateway = 10.0.1.1
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// -[more]
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// -{86226414-5545-4335-A9D1-5BD7120119AD}
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// -DhcpIpAddress = 10.0.1.5
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// -DhcpDefaultGateay = 10.0.1.1
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// -[more]
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//
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// In order to extract this information, we enumerate each network card, and extract the ServiceName value.
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// This is then used to open the interface subfolder, and attempt to extract a DhcpDefaultGateway value.
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// Once one is found, we're done.
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//
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// It may be possible to simply enumerate the interface folders until we find one with a DhcpDefaultGateway value.
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// However, the technique used is the technique most cited on the web, and we assume it to be more correct.
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if(ERROR_SUCCESS != RegOpenKeyEx(HKEY_LOCAL_MACHINE, // Open registry key or predifined key
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networkCardsPath, // Name of registry subkey to open
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0, // Reserved - must be zero
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KEY_READ, // Mask - desired access rights
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&networkCardsKey)) // Pointer to output key
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{
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// Unable to open network cards keys
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return -1;
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}
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if(ERROR_SUCCESS != RegOpenKeyEx(HKEY_LOCAL_MACHINE, // Open registry key or predefined key
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interfacesPath, // Name of registry subkey to open
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0, // Reserved - must be zero
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KEY_READ, // Mask - desired access rights
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&interfacesKey)) // Pointer to output key
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{
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// Unable to open interfaces key
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RegCloseKey(networkCardsKey);
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return -1;
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}
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// Figure out how many subfolders are within the NetworkCards folder
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RegQueryInfoKey(networkCardsKey, NULL, NULL, NULL, &numSubKeys, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
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//printf( "Number of subkeys: %u\n", (unsigned int)numSubKeys);
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// Enumrate through each subfolder within the NetworkCards folder
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for(i = 0; i < numSubKeys && !done; i++)
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{
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keyNameLength = MAX_KEY_LENGTH;
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if(ERROR_SUCCESS == RegEnumKeyEx(networkCardsKey, // Open registry key
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i, // Index of subkey to retrieve
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keyName, // Buffer that receives the name of the subkey
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&keyNameLength, // Variable that receives the size of the above buffer
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NULL, // Reserved - must be NULL
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NULL, // Buffer that receives the class string
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NULL, // Variable that receives the size of the above buffer
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NULL)) // Variable that receives the last write time of subkey
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{
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if(RegOpenKeyEx(networkCardsKey, keyName, 0, KEY_READ, &networkCardKey) == ERROR_SUCCESS)
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{
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keyValueLength = MAX_VALUE_LENGTH;
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if(ERROR_SUCCESS == RegQueryValueEx(networkCardKey, // Open registry key
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"ServiceName", // Name of key to query
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NULL, // Reserved - must be NULL
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&keyValueType, // Receives value type
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keyValue, // Receives value
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&keyValueLength)) // Receives value length in bytes
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{
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//printf("keyValue: %s\n", keyValue);
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if(RegOpenKeyEx(interfacesKey, keyValue, 0, KEY_READ, &interfaceKey) == ERROR_SUCCESS)
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{
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gatewayValueLength = MAX_VALUE_LENGTH;
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if(ERROR_SUCCESS == RegQueryValueEx(interfaceKey, // Open registry key
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"DhcpDefaultGateway", // Name of key to query
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NULL, // Reserved - must be NULL
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&gatewayValueType, // Receives value type
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gatewayValue, // Receives value
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&gatewayValueLength)) // Receives value length in bytes
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{
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// Check to make sure it's a string
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if(gatewayValueType == REG_MULTI_SZ || gatewayValueType == REG_SZ)
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{
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//printf("gatewayValue: %s\n", gatewayValue);
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done = 1;
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}
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}
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RegCloseKey(interfaceKey);
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}
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}
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RegCloseKey(networkCardKey);
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}
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}
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}
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RegCloseKey(interfacesKey);
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RegCloseKey(networkCardsKey);
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if(done)
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{
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*addr = inet_addr(gatewayValue);
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return 0;
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}
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return -1;
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}
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#endif /* #ifdef USE_WIN32_CODE */
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