diff options
| -rw-r--r-- | ldns-host.c | 50 |
1 files changed, 41 insertions, 9 deletions
diff --git a/ldns-host.c b/ldns-host.c index 3184f688878a..74121b473607 100644 --- a/ldns-host.c +++ b/ldns-host.c @@ -156,6 +156,19 @@ memerr: return LDNS_STATUS_MEM_ERR; } +static uint32_t +ldns_rr_soa_get_serial(const ldns_rr *rr) +{ + const ldns_rdf *rdf; + + if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_SOA) return 0; + if (ldns_rr_rd_count(rr) != 7) return 0; + rdf = ldns_rr_rdf(rr, 2); + if (ldns_rdf_get_type(rdf) != LDNS_RDF_TYPE_INT32) return 0; + if (ldns_rdf_size(rdf) != 4) return 0; + return ldns_rdf2native_int32(rdf); +} + static ldns_status ldns_tcp_start(ldns_resolver *res, ldns_pkt *qpkt, int nameserver) { /* This routine is based on ldns_axfr_start, with the major @@ -873,18 +886,16 @@ dozonetransfer(ldns_resolver *res, ldns_rdf *domain, bool absolute) { ldns_rdf *dname; ldns_rr_type rrtype; ldns_rr_list *rrl; - int i, nsoa = 0; + ldns_rr *rr; + size_t i, nsoa = 0; + uint32_t first_serial; rrtype = o_rrtype; o_rrtype = (o_mode == M_AXFR) ? LDNS_RR_TYPE_AXFR : LDNS_RR_TYPE_IXFR; dname = search(res, domain, &pkt, absolute, false); for (;;) { - rrl = ldns_pkt_answer(pkt); - for (i = ldns_rr_list_rr_count(rrl) - 1; i >= 0; i--) { - if (ldns_rr_get_type(ldns_rr_list_rr(rrl, i)) == LDNS_RR_TYPE_SOA) - nsoa++; - } + rrl = ldns_rr_list_clone(ldns_pkt_answer(pkt)); ldns_pkt_filter_answer(pkt, rrtype); report(res, dname != NULL ? dname : domain, pkt); if ((dname == NULL) || @@ -893,9 +904,29 @@ dozonetransfer(ldns_resolver *res, ldns_rdf *domain, bool absolute) { ldns_tcp_close(res); return false; } - if (nsoa >= 2) { - ldns_tcp_close(res); - return true; + for (i = 0; i < ldns_rr_list_rr_count(rrl); i++) { + rr = ldns_rr_list_rr(rrl, i); + if (nsoa == 0) { + if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_SOA) { + printf("; Transfer failed. " + "Didn't start with SOA answer.\n"); + ldns_tcp_close(res); + return false; + } + first_serial = ldns_rr_soa_get_serial(rr); + if ((o_mode == M_IXFR) && (first_serial <= o_ixfr_serial)) { + ldns_tcp_close(res); + return true; + } + } + if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_SOA) { + nsoa = nsoa < 2 ? nsoa + 1 : 1; + if ((nsoa == 2) && + (ldns_rr_soa_get_serial(rr) == first_serial)) { + ldns_tcp_close(res); + return true; + } + } } if (ldns_tcp_read(&nextpkt, res) != LDNS_STATUS_OK) { printf("; Transfer failed.\n"); @@ -904,6 +935,7 @@ dozonetransfer(ldns_resolver *res, ldns_rdf *domain, bool absolute) { ldns_pkt_set_answerfrom(nextpkt, ldns_rdf_clone(ldns_pkt_answerfrom(pkt))); ldns_pkt_free(pkt); + ldns_rr_list_free(rrl); pkt = nextpkt; } } |