From 6b4960155e94076bf25518e4e268a7a5f849308e Mon Sep 17 00:00:00 2001 From: Jo-Philipp Wich Date: Thu, 27 Jun 2019 17:27:29 +0200 Subject: [PATCH] nslookup: implement support for SRV records Add support for querying and parsing SRV DNS records. function old new delta send_queries 1711 1865 +154 qtypes 72 80 +8 Signed-off-by: Jo-Philipp Wich Signed-off-by: Denys Vlasenko --- networking/nslookup.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/networking/nslookup.c b/networking/nslookup.c index a7dd823f0..c43e60558 100644 --- a/networking/nslookup.c +++ b/networking/nslookup.c @@ -283,6 +283,7 @@ static const struct { { ns_t_cname, "CNAME" }, { ns_t_mx, "MX" }, { ns_t_txt, "TXT" }, + { ns_t_srv, "SRV" }, { ns_t_ptr, "PTR" }, { ns_t_any, "ANY" }, }; @@ -435,6 +436,25 @@ static int parse_reply(const unsigned char *msg, size_t len) } break; + case ns_t_srv: + if (rdlen < 6) { + //printf("SRV record too short\n"); + return -1; + } + + cp = ns_rr_rdata(rr); + n = ns_name_uncompress(ns_msg_base(handle), ns_msg_end(handle), + cp + 6, dname, sizeof(dname)); + + if (n < 0) { + //printf("Unable to uncompress domain: %s\n", strerror(errno)); + return -1; + } + + printf("%s\tservice = %u %u %u %s\n", ns_rr_name(rr), + ns_get16(cp), ns_get16(cp + 2), ns_get16(cp + 4), dname); + break; + case ns_t_soa: if (rdlen < 20) { dbg("SOA record too short:%d\n", rdlen);