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add dest ip restriction

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wangyu- 2017-10-28 00:45:19 -05:00
parent f9eaae172f
commit 6728d5a561
1 changed files with 11 additions and 0 deletions
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11
tun_dev.cpp
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@ -293,6 +293,17 @@ int tun_dev_client_event_loop()
mylog(log_warn,"read from tun_fd return %d,errno=%s\n",len,strerror(errno)); mylog(log_warn,"read from tun_fd return %d,errno=%s\n",len,strerror(errno));
continue; continue;
} }
if(len>=20)
{
u32_t dest_ip=htonl(read_u32(data+16));
if( ( ntohl(sub_net_uint32)&0xFFFFFF00 ) != ( ntohl (dest_ip) &0xFFFFFF00) )
{
string sub=my_ntoa(dest_ip);
string dst=my_ntoa( htonl( ntohl (dest_ip) &0xFFFFFF00) );
mylog(log_warn,"packet's dest ip [%s] not in subnet [%s],dropped\n", sub.c_str(), dst.c_str());
continue;
}
}
mylog(log_trace,"Received packet from tun,len: %d\n",len); mylog(log_trace,"Received packet from tun,len: %d\n",len);