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Code Issues Releases Wiki Activity

Native skip TCP options

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This commit is contained in:
M66B 2016-01-18 21:18:23 +01:00
parent af04ece071
commit e1eb6342ba
1 changed files with 15 additions and 8 deletions
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23
app/src/main/jni/netguard/netguard.c
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@ -548,11 +548,13 @@ void handle_ip(const struct arguments *args, const uint8_t *buffer, const uint16
saddr = &ip4hdr->saddr; saddr = &ip4hdr->saddr;
daddr = &ip4hdr->daddr; daddr = &ip4hdr->daddr;
if (ip4hdr->frag_off & IP_MF) if (ip4hdr->frag_off & IP_MF) {
log_android(ANDROID_LOG_ERROR, "IP fragment");
flags[flen++] = '+'; flags[flen++] = '+';
}
uint8_t optlen = (ip4hdr->ihl - 5) * 4; uint8_t ipoptlen = (ip4hdr->ihl - 5) * 4;
payload = buffer + 20 + optlen; payload = buffer + sizeof(struct iphdr) + ipoptlen;
if (ntohs(ip4hdr->tot_len) != length) { if (ntohs(ip4hdr->tot_len) != length) {
log_android(ANDROID_LOG_ERROR, "Invalid length %u header length %u", log_android(ANDROID_LOG_ERROR, "Invalid length %u header length %u",
@ -682,13 +684,16 @@ void handle_tcp(const struct arguments *args, const uint8_t *buffer, uint16_t le
// Get headers // Get headers
struct iphdr *iphdr = buffer; struct iphdr *iphdr = buffer;
uint8_t optlen = (iphdr->ihl - 5) * 4; uint8_t ipoptlen = (iphdr->ihl - 5) * 4;
struct tcphdr *tcphdr = buffer + sizeof(struct iphdr) + optlen; struct tcphdr *tcphdr = buffer + sizeof(struct iphdr) + ipoptlen;
if (optlen) uint8_t tcpoptlen = (tcphdr->doff - 5) * 4;
log_android(ANDROID_LOG_INFO, "optlen %d", optlen); if (tcpoptlen) {
// TODO handle TCP options
log_android(ANDROID_LOG_INFO, "optlen %d", tcpoptlen);
}
// Get data // Get data
uint16_t dataoff = sizeof(struct iphdr) + optlen + sizeof(struct tcphdr); uint16_t dataoff = sizeof(struct iphdr) + ipoptlen + sizeof(struct tcphdr) + tcpoptlen;
uint16_t datalen = length - dataoff; uint16_t datalen = length - dataoff;
// Search session // Search session
@ -1157,6 +1162,8 @@ int write_tcp(const struct session *cur,
ntohl(tcp->seq) - cur->local_start, ntohl(tcp->seq) - cur->local_start,
ntohl(tcp->ack_seq) - cur->remote_start, ntohl(tcp->ack_seq) - cur->remote_start,
datalen, confirm); datalen, confirm);
// TODO non blocking
int res = write(tun, buffer, len); int res = write(tun, buffer, len);
#ifdef PROFILE #ifdef PROFILE