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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); write_rst(args, &s->tcp);
// Connection refused // Connection refused
if (err >= 0 && (serr == ECONNREFUSED || serr == EHOSTUNREACH)) { if (0)
struct icmp icmp; if (err >= 0 && (serr == ECONNREFUSED || serr == EHOSTUNREACH)) {
memset(&icmp, 0, sizeof(struct icmp)); struct icmp icmp;
icmp.icmp_type = ICMP_UNREACH; memset(&icmp, 0, sizeof(struct icmp));
if (serr == ECONNREFUSED) icmp.icmp_type = ICMP_UNREACH;
icmp.icmp_code = ICMP_UNREACH_PORT; if (serr == ECONNREFUSED)
else icmp.icmp_code = ICMP_UNREACH_PORT;
icmp.icmp_code = ICMP_UNREACH_HOST; else
icmp.icmp_cksum = 0; icmp.icmp_code = ICMP_UNREACH_HOST;
icmp.icmp_cksum = ~calc_checksum(0, &icmp, 4); icmp.icmp_cksum = 0;
icmp.icmp_cksum = ~calc_checksum(0, &icmp, 4);
struct icmp_session sicmp; struct icmp_session sicmp;
memset(&sicmp, 0, sizeof(struct icmp_session)); memset(&sicmp, 0, sizeof(struct icmp_session));
sicmp.version = s->tcp.version; sicmp.version = s->tcp.version;
if (s->tcp.version == 4) { if (s->tcp.version == 4) {
sicmp.saddr.ip4 = (__be32) s->tcp.saddr.ip4; sicmp.saddr.ip4 = (__be32) s->tcp.saddr.ip4;
sicmp.daddr.ip4 = (__be32) s->tcp.daddr.ip4; sicmp.daddr.ip4 = (__be32) s->tcp.daddr.ip4;
} }
else { else {
memcpy(&sicmp.saddr.ip6, &s->tcp.saddr.ip6, 16); memcpy(&sicmp.saddr.ip6, &s->tcp.saddr.ip6, 16);
memcpy(&sicmp.daddr.ip6, &s->tcp.daddr.ip6, 16); memcpy(&sicmp.daddr.ip6, &s->tcp.daddr.ip6, 16);
} }
write_icmp(args, &sicmp, &icmp, 8); write_icmp(args, &sicmp, &icmp, 8);
} }
} }
else { else {
// Assume socket okay // Assume socket okay