diff options
Diffstat (limited to 'src/cache/dns.c')
-rw-r--r-- | src/cache/dns.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/cache/dns.c b/src/cache/dns.c new file mode 100644 index 0000000..ce5b611 --- /dev/null +++ b/src/cache/dns.c @@ -0,0 +1,38 @@ +/* ISC license. */ + +#include <skalibs/uint16.h> + +#include <s6-dns/s6dns.h> + +#include "shibari-cache-internal.h" + +int dns_newquery (uint8_t source, uint16_t i, char const *ip, uint16_t port, char const *buf, uint16_t len) +{ + dcache_key_t data ; + s6dns_message_header_t hdr ; + s6dns_message_counts_t counts ; + s6dns_domain_t name ; + unsigned int pos ; + unsigned int rcode ; + uint16_t qtype ; + char key[257] ; + + if (!s6dns_message_parse_init(&hdr, &counts, buf, len, &pos)) return 1 ; + if (hdr.opcode) { rcode = 4 ; goto err ; } + if (!hdr.rd) { rcode = 1 ; goto err ; } + if (!s6dns_message_parse_question(&counts, &name, &qtype, buf, len, &pos) + || !s6dns_domain_encode(&name)) + { + rcode = errno == ENOTSUP ? 4 : 1 ; + goto answer ; + } + + if (cache_search(&name, qtype, &data)) goto got ; + return 1 ; + + answer: + return 1 ; + err: + got : + return 1 ; +} |