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Dump ip header when something looks wrong

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This commit is contained in:
angt
2015-11-10 17:28:44 +01:00
parent ff8372c70e
commit b686dd845c
1 changed files with 25 additions and 3 deletions
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28
main.c
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@@ -491,6 +491,21 @@ static int decrypt_packet (struct crypto_ctx *ctx, uint8_t *packet, size_t size,
return 0;
}
static void dump_ip_header (uint8_t *data, size_t size)
{
const char tbl[] = "0123456789ABCDEF";
size_t hex_size = (size<20)?size:20;
char hex[(20<<1)+1];
for (size_t i=0; i<hex_size; i++) {
hex[(i<<1)+0] = tbl[0xF&(data[i]>>4)];
hex[(i<<1)+1] = tbl[0xF&data[i]];
}
hex[20<<1] = 0;
fprintf(stderr, "DUMP(%zu): %s\n", size, hex);
}
static void set_ip_size (uint8_t *data, size_t size)
{
data[2] = 0xFF&(size>>8);
@@ -754,11 +769,18 @@ int main (int argc, char **argv)
ssize_t ip_size = get_ip_size(tunr.buf, sizeof(tunr.buf));
if (ip_size<=0 || r>ip_size)
if (ip_size<=0)
continue;
if (r<ip_size)
set_ip_size(tunr.buf, r);
if (ip_size!=r) {
dump_ip_header(tunr.buf, r);
if (r<ip_size) {
set_ip_size(tunr.buf, r);
} else {
continue;
}
}
encrypt_packet(&ctx, tunr.buf, r, &sock.write.buf);
}