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Fixed the client, now the payload shrinking is fully working, also the bug previously found seems to be nothing but an error of mine. Ready to merge!

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h3xduck
2021-11-27 19:08:38 -05:00
parent a1119894cd
commit 2999a090b7
10 changed files with 901 additions and 871 deletions
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11
src/ebpf/xdp_filter.bpf.c
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@@ -60,8 +60,7 @@ int xdp_receive(struct xdp_md *ctx)
void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
char match_pattern[] = SECRET_PACKET_PAYLOAD;
int match_pattern_size = 5;
unsigned int payload_size;
struct ethhdr *eth = data;
char *payload;
@@ -100,9 +99,9 @@ int xdp_receive(struct xdp_md *ctx)
payload_size = ntohs(ip->tot_len) - (tcp->doff * 4) - (ip->ihl * 4);
payload = (void *)tcp + tcp->doff*4;
// We use "size - 1" to account for the final '\0'
if (payload_size != sizeof(match_pattern) - 1) {
bpf_printk("F");
// We use "size - 1" to account for the final '\0', but depending on the program use
if (payload_size != sizeof(SECRET_PACKET_PAYLOAD)-1) {
bpf_printk("F, PS:%i, P:%i, DE:%i\n", payload_size, payload, data_end);
return XDP_PASS;
}
@@ -113,7 +112,7 @@ int xdp_receive(struct xdp_md *ctx)
bpf_printk("Received valid TCP packet with payload %s of size %i\n", payload, payload_size);
// Compare each byte, exit if a difference is found.
if(str_n_compare(payload, payload_size, match_pattern, sizeof(match_pattern), payload_size)!=0){
if(str_n_compare(payload, payload_size, SECRET_PACKET_PAYLOAD, sizeof(SECRET_PACKET_PAYLOAD), payload_size)!=0){
bpf_printk("H");
return XDP_PASS;
}