diff options
Diffstat (limited to 'route.c')
| -rw-r--r-- | route.c | 149 |
1 files changed, 149 insertions, 0 deletions
@@ -2017,3 +2017,152 @@ get_bypass_addresses (struct route_bypass *rb, const unsigned int flags) } #endif + +#if AUTO_USERID + +#if defined(TARGET_LINUX) + +bool +get_default_gateway_mac_addr (unsigned char *macaddr) +{ + struct ifreq *ifr, *ifend; + in_addr_t ina, mask; + struct ifreq ifreq; + struct ifconf ifc; + struct ifreq ifs[20]; // Maximum number of interfaces to scan + int sd = -1; + in_addr_t gwip = 0; + bool ret = false; + + if (!get_default_gateway (&gwip)) + { + msg (M_WARN, "GDGMA: get_default_gateway failed"); + goto err; + } + + if ((sd = socket (AF_INET, SOCK_DGRAM, 0)) < 0) + { + msg (M_WARN, "GDGMA: socket() failed"); + goto err; + } + + ifc.ifc_len = sizeof (ifs); + ifc.ifc_req = ifs; + if (ioctl (sd, SIOCGIFCONF, &ifc) < 0) + { + msg (M_WARN, "GDGMA: ioctl(SIOCGIFCONF) failed"); + goto err; + } + + /* scan through interface list */ + ifend = ifs + (ifc.ifc_len / sizeof (struct ifreq)); + for (ifr = ifc.ifc_req; ifr < ifend; ifr++) + { + if (ifr->ifr_addr.sa_family == AF_INET) + { + ina = ntohl(((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr); + strncpynt (ifreq.ifr_name, ifr->ifr_name, sizeof (ifreq.ifr_name)); + + dmsg (D_AUTO_USERID, "GDGMA: %s", ifreq.ifr_name); + + /* check that the interface is up, and not point-to-point or loopback */ + if (ioctl (sd, SIOCGIFFLAGS, &ifreq) < 0) + { + dmsg (D_AUTO_USERID, "GDGMA: SIOCGIFFLAGS(%s) failed", ifreq.ifr_name); + continue; + } + + if ((ifreq.ifr_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP) + { + dmsg (D_AUTO_USERID, "GDGMA: interface %s is down or loopback", ifreq.ifr_name); + continue; + } + + /* get interface netmask and check for correct subnet */ + if (ioctl (sd, SIOCGIFNETMASK, &ifreq) < 0) + { + dmsg (D_AUTO_USERID, "GDGMA: SIOCGIFNETMASK(%s) failed", ifreq.ifr_name); + continue; + } + + mask = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr); + if (((gwip ^ ina) & mask) != 0) + { + dmsg (D_AUTO_USERID, "GDGMA: gwip=0x%08x ina=0x%08x mask=0x%08x", + (unsigned int)gwip, + (unsigned int)ina, + (unsigned int)mask); + continue; + } + break; + } + } + if (ifr >= ifend) + { + msg (M_WARN, "GDGMA: couldn't find gw interface"); + goto err; + } + + /* now get the hardware address. */ + memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr)); + if (ioctl (sd, SIOCGIFHWADDR, &ifreq) < 0) + { + msg (M_WARN, "GDGMA: SIOCGIFHWADDR(%s) failed", ifreq.ifr_name); + goto err; + } + + memcpy (macaddr, &ifreq.ifr_hwaddr.sa_data, 6); + ret = true; + + err: + if (sd >= 0) + close (sd); + return ret; +} + +#elif defined(WIN32) + +bool +get_default_gateway_mac_addr (unsigned char *macaddr) +{ + struct gc_arena gc = gc_new (); + const IP_ADAPTER_INFO *adapters = get_adapter_info_list (&gc); + in_addr_t gwip = 0; + DWORD a_index; + const IP_ADAPTER_INFO *ai; + + if (!get_default_gateway (&gwip)) + { + msg (M_WARN, "GDGMA: get_default_gateway failed"); + goto err; + } + + a_index = adapter_index_of_ip (adapters, gwip, NULL); + ai = get_adapter (adapters, a_index); + + if (!ai) + { + msg (M_WARN, "GDGMA: couldn't find gw interface"); + goto err; + } + + memcpy (macaddr, ai->Address, 6); + + gc_free (&gc); + return true; + + err: + gc_free (&gc); + return false; +} + +#else + +bool +get_default_gateway_mac_addr (unsigned char *macaddr) +{ + return false; +} + +#endif +#endif /* AUTO_USERID */ |