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sock: choose target with the lowest priority

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sock_srv_lookup chose the last target in the answer section. But it must
choose one with the lowest priority it can reach (due to RFC2052).
This commit is contained in:
Dmitry Podgorny
2015-10-15 17:49:44 +03:00
parent 182803926b
commit 4cc9ba79c4
1 changed files with 9 additions and 8 deletions
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17
src/sock.c
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@@ -837,6 +837,7 @@ int sock_srv_lookup(const char *service, const char *proto,
#else #else
if (!set) { if (!set) {
unsigned char buf[65535]; unsigned char buf[65535];
unsigned short min;
int len; int len;
if ((len = res_query(fulldomain, C_IN, T_SRV, buf, 65535)) > 0) { if ((len = res_query(fulldomain, C_IN, T_SRV, buf, 65535)) > 0) {
@@ -853,22 +854,22 @@ int sock_srv_lookup(const char *service, const char *proto,
netbuf_get_dnsquery_question(buf, 65536, &offset, &question); netbuf_get_dnsquery_question(buf, 65536, &offset, &question);
} }
min = 65535;
for (i = 0; i < header.ancount; i++) { for (i = 0; i < header.ancount; i++) {
netbuf_get_dnsquery_resourcerecord(buf, 65536, &offset, &rr); netbuf_get_dnsquery_resourcerecord(buf, 65536, &offset, &rr);
if (rr.type == 33) { if (rr.type == 33) {
struct dnsquery_srvrdata *srvrdata = &(rr.rdata); struct dnsquery_srvrdata *srvrdata = &(rr.rdata);
snprintf(resulttarget, resulttargetlength, "%s", if (srvrdata->priority < min || !set) {
srvrdata->target); snprintf(resulttarget, resulttargetlength, "%s",
*resultport = srvrdata->port; srvrdata->target);
set = 1; *resultport = srvrdata->port;
set = 1;
min = srvrdata->priority;
}
} }
} }
for (i = 0; i < header.ancount; i++) {
netbuf_get_dnsquery_resourcerecord(buf, 65536, &offset, &rr);
}
} }
} }
#endif #endif