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Do not handle traffic from private IP ranges

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ValdikSS 2017-08-15 14:09:47 +03:00
parent b74c974235
commit 2fe377a23f
1 changed files with 33 additions and 9 deletions
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42
goodbyedpi.c
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@ -20,6 +20,21 @@
#define TCP_HDR_LEN 20 #define TCP_HDR_LEN 20
#define IPV4_TOTALLEN_OFFSET 2 #define IPV4_TOTALLEN_OFFSET 2
#define TCP_WINDOWSIZE_OFFSET 14 #define TCP_WINDOWSIZE_OFFSET 14
#define DIVERT_NO_LOCALNETS_DST "(" \
"(ip.DstAddr < 127.0.0.1 or ip.DstAddr > 127.255.255.255) and " \
"(ip.DstAddr < 10.0.0.0 or ip.DstAddr > 10.255.255.255) and " \
"(ip.DstAddr < 192.168.0.0 or ip.DstAddr > 192.168.255.255) and " \
"(ip.DstAddr < 172.16.0.0 or ip.DstAddr > 172.31.255.255) and " \
"(ip.DstAddr < 169.254.0.0 or ip.DstAddr > 169.254.255.255)" \
")"
#define DIVERT_NO_LOCALNETS_SRC "(" \
"(ip.SrcAddr < 127.0.0.1 or ip.SrcAddr > 127.255.255.255) and " \
"(ip.SrcAddr < 10.0.0.0 or ip.SrcAddr > 10.255.255.255) and " \
"(ip.SrcAddr < 192.168.0.0 or ip.SrcAddr > 192.168.255.255) and " \
"(ip.SrcAddr < 172.16.0.0 or ip.SrcAddr > 172.31.255.255) and " \
"(ip.SrcAddr < 169.254.0.0 or ip.SrcAddr > 169.254.255.255)" \
")"
static HANDLE filters[MAX_FILTERS]; static HANDLE filters[MAX_FILTERS];
static int filter_num = 0; static int filter_num = 0;
@ -238,21 +253,30 @@ int main(int argc, char *argv[]) {
filter_num = 0; filter_num = 0;
if (do_passivedpi) { if (do_passivedpi) {
/* Filter for inbound RST packets with ID = 0 or 1 */ /* IPv4 filter for inbound RST packets with ID = 0 or 1 */
filters[filter_num] = init("inbound and (ip.Id == 0x0001 or ip.Id == 0x0000) and " filters[filter_num] = init(
"(tcp.SrcPort == 443 or tcp.SrcPort == 80) and tcp.Rst", "inbound and ip and tcp and "
WINDIVERT_FLAG_DROP); "(ip.Id == 0x0001 or ip.Id == 0x0000) and "
"(tcp.SrcPort == 443 or tcp.SrcPort == 80) and tcp.Rst and "
DIVERT_NO_LOCALNETS_SRC,
WINDIVERT_FLAG_DROP);
filter_num++; filter_num++;
} }
/* /*
* Filter for inbound HTTP redirection packets and * IPv4 filter for inbound HTTP redirection packets and
* active DPI circumvention * active DPI circumvention
*/ */
filters[filter_num] = init("(inbound and (ip.Id == 0x0001 or ip.Id == 0x0000) and tcp.SrcPort == 80 and tcp.Ack) " filters[filter_num] = init("ip and tcp and "
"or (inbound and (tcp.SrcPort == 80 or tcp.SrcPort == 443) and tcp.Ack and tcp.Syn) " "(inbound and (("
"or (outbound and (tcp.DstPort == 80 or tcp.DstPort == 443) and tcp.Ack)", "((ip.Id == 0x0001 or ip.Id == 0x0000) and tcp.SrcPort == 80 and tcp.Ack) or "
0); "((tcp.SrcPort == 80 or tcp.SrcPort == 443) and tcp.Ack and tcp.Syn)"
") and " DIVERT_NO_LOCALNETS_SRC ") or "
"(outbound and "
"(tcp.DstPort == 80 or tcp.DstPort == 443) and tcp.Ack and "
DIVERT_NO_LOCALNETS_DST ")"
")",
0);
w_filter = filters[filter_num]; w_filter = filters[filter_num];
filter_num++; filter_num++;