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nslookup: implement support for SRV records

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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 <jo@mein.io>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Jo-Philipp Wich 2019-06-27 17:27:29 +02:00 committed by Denys Vlasenko
parent 8c3b520d4f
commit 6b4960155e
1 changed files with 20 additions and 0 deletions
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20
networking/nslookup.c
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@ -283,6 +283,7 @@ static const struct {
{ ns_t_cname, "CNAME" }, { ns_t_cname, "CNAME" },
{ ns_t_mx, "MX" }, { ns_t_mx, "MX" },
{ ns_t_txt, "TXT" }, { ns_t_txt, "TXT" },
{ ns_t_srv, "SRV" },
{ ns_t_ptr, "PTR" }, { ns_t_ptr, "PTR" },
{ ns_t_any, "ANY" }, { ns_t_any, "ANY" },
}; };
@ -435,6 +436,25 @@ static int parse_reply(const unsigned char *msg, size_t len)
} }
break; 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: case ns_t_soa:
if (rdlen < 20) { if (rdlen < 20) {
dbg("SOA record too short:%d\n", rdlen); dbg("SOA record too short:%d\n", rdlen);