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Code Issues Releases Wiki Activity

Disable ICMP unreachable

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This commit is contained in:
M66B 2017-03-04 12:26:45 +01:00
parent 90d743c7e3
commit 3cb9b79bf9
1 changed files with 24 additions and 23 deletions
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47
app/src/main/jni/netguard/tcp.c
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@ -264,31 +264,32 @@ void check_tcp_socket(const struct arguments *args,
write_rst(args, &s->tcp);
// Connection refused
if (err >= 0 && (serr == ECONNREFUSED || serr == EHOSTUNREACH)) {
struct icmp icmp;
memset(&icmp, 0, sizeof(struct icmp));
icmp.icmp_type = ICMP_UNREACH;
if (serr == ECONNREFUSED)
icmp.icmp_code = ICMP_UNREACH_PORT;
else
icmp.icmp_code = ICMP_UNREACH_HOST;
icmp.icmp_cksum = 0;
icmp.icmp_cksum = ~calc_checksum(0, &icmp, 4);
if (0)
if (err >= 0 && (serr == ECONNREFUSED || serr == EHOSTUNREACH)) {
struct icmp icmp;
memset(&icmp, 0, sizeof(struct icmp));
icmp.icmp_type = ICMP_UNREACH;
if (serr == ECONNREFUSED)
icmp.icmp_code = ICMP_UNREACH_PORT;
else
icmp.icmp_code = ICMP_UNREACH_HOST;
icmp.icmp_cksum = 0;
icmp.icmp_cksum = ~calc_checksum(0, &icmp, 4);
struct icmp_session sicmp;
memset(&sicmp, 0, sizeof(struct icmp_session));
sicmp.version = s->tcp.version;
if (s->tcp.version == 4) {
sicmp.saddr.ip4 = (__be32) s->tcp.saddr.ip4;
sicmp.daddr.ip4 = (__be32) s->tcp.daddr.ip4;
}
else {
memcpy(&sicmp.saddr.ip6, &s->tcp.saddr.ip6, 16);
memcpy(&sicmp.daddr.ip6, &s->tcp.daddr.ip6, 16);
}
struct icmp_session sicmp;
memset(&sicmp, 0, sizeof(struct icmp_session));
sicmp.version = s->tcp.version;
if (s->tcp.version == 4) {
sicmp.saddr.ip4 = (__be32) s->tcp.saddr.ip4;
sicmp.daddr.ip4 = (__be32) s->tcp.daddr.ip4;
}
else {
memcpy(&sicmp.saddr.ip6, &s->tcp.saddr.ip6, 16);
memcpy(&sicmp.daddr.ip6, &s->tcp.daddr.ip6, 16);
}
write_icmp(args, &sicmp, &icmp, 8);
}
write_icmp(args, &sicmp, &icmp, 8);
}
}
else {
// Assume socket okay