+for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
+ if (rr->type == rr_type) found++;
+
+if (found == 0)
+ {
+ SPF_dns_rr_dup(&spfrr, &srr);
+ store_free_dns_answer(dnsa);
+ return spfrr;
+ }
+
+srr.rr = store_malloc(sizeof(SPF_dns_rr_data_t) * found);
+
+found = 0;
+for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
+ if (rr->type == rr_type)
+ {
+ const uschar * s = rr->data;
+
+ srr.ttl = rr->ttl;
+ switch(rr_type)
+ {
+ case T_MX:
+ s += 2; /* skip the MX precedence field */
+ case T_PTR:
+ {
+ uschar * buf = store_malloc(256);
+ (void)dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, s,
+ (DN_EXPAND_ARG4_TYPE)buf, 256);
+ s = buf;
+ break;
+ }
+
+ case T_TXT:
+ {
+ gstring * g = NULL;
+ uschar chunk_len;
+
+ if (strncmpic(rr->data+1, US SPF_VER_STR, 6) != 0)
+ {
+ HDEBUG(D_host_lookup) debug_printf("not an spf record: %.*s\n",
+ (int) s[0], s+1);
+ continue;
+ }
+
+ for (int off = 0; off < rr->size; off += chunk_len)
+ {
+ if (!(chunk_len = s[off++])) break;
+ g = string_catn(g, s+off, chunk_len);
+ }
+ if (!g)
+ continue;
+ gstring_release_unused(g);
+ s = string_copy_malloc(string_from_gstring(g));
+ DEBUG(D_receive) debug_printf("SPF_dns_exim_lookup '%s'\n", s);
+ break;
+ }
+
+ case T_A:
+ case T_AAAA:
+ default:
+ {
+ uschar * buf = store_malloc(dnsa->answerlen + 1);
+ s = memcpy(buf, s, dnsa->answerlen + 1);
+ break;
+ }
+ }
+ srr.rr[found++] = (void *) s;
+ }
+
+/* Did we filter out all TXT RRs? Return NO_DATA instead of SUCCESS with
+empty ANSWER section. */