/** Request the IPv4 address (A) records for a domain name. */
int dns_ip4_r(struct dns_transmit* tx, struct dns_result *out, const char* fqdn)
{
char *q = 0;
ipv4addr ip;
const char* x;
if ((x = ipv4_scan(fqdn, &ip)) != 0 && *x == 0) {
if (dns_result_alloc(out, DNS_T_A, 1, 0) < 0)
return -1;
memcpy(out->rr.ip4, &ip, sizeof ip);
return 0;
}
if (!dns_domain_fromdot(&q,fqdn,strlen(fqdn))) return -1;
if (dns_resolve(tx,q,DNS_T_A) == -1) { free(q); return -1; }
free(q);
if (dns_ip4_packet(out,tx->packet,tx->packetlen) == -1) return -1;
dns_transmit_free(tx);
return 0;
}
int dns_ip4(stralloc *out,const stralloc *fqdn)
{
unsigned int i;
char code;
char ch;
if (!stralloc_copys(out,"")) return -1;
code = 0;
for (i = 0;i <= fqdn->len;++i) {
if (i < fqdn->len)
ch = fqdn->s[i];
else
ch = '.';
if ((ch == '[') || (ch == ']')) continue;
if (ch == '.') {
if (!stralloc_append(out,&code)) return -1;
code = 0;
continue;
}
if ((ch >= '0') && (ch <= '9')) {
code *= 10;
code += ch - '0';
continue;
}
if (!dns_domain_fromdot(&q,fqdn->s,fqdn->len)) return -1;
if (dns_resolve(q,DNS_T_A) == -1) return -1;
if (dns_ip4_packet(out,dns_resolve_tx.packet,dns_resolve_tx.packetlen) == -1) return -1;
dns_transmit_free(&dns_resolve_tx);
dns_domain_free(&q);
return 0;
}
out->len &= ~3;
return 0;
}
