+/*************************************************
+* Replace gethostbyname() when testing *
+*************************************************/
+
+/* This function is called instead of gethostbyname(), gethostbyname2(), or
+getipnodebyname() when running in the test harness. It recognizes the name
+"manyhome.test.ex" and generates a humungous number of IP addresses. It also
+recognizes an unqualified "localhost" and forces it to the appropriate loopback
+address. IP addresses are treated as literals. For other names, it uses the DNS
+to find the host name. In the new test harness, this means it will access only
+the fake DNS resolver. In the old harness it will call the real resolver and
+access the test zone.
+
+Arguments:
+ name the host name or a textual IP address
+ af AF_INET or AF_INET6
+ error_num where to put an error code:
+ HOST_NOT_FOUND/TRY_AGAIN/NO_RECOVERY/NO_DATA
+
+Returns: a hostent structure or NULL for an error
+*/
+
+static struct hostent *
+host_fake_gethostbyname(uschar *name, int af, int *error_num)
+{
+#if HAVE_IPV6
+int alen = (af == AF_INET)? sizeof(struct in_addr):sizeof(struct in6_addr);
+#else
+int alen = sizeof(struct in_addr);
+#endif
+
+int ipa;
+uschar *lname = name;
+uschar *adds;
+uschar **alist;
+struct hostent *yield;
+dns_answer dnsa;
+dns_scan dnss;
+dns_record *rr;
+
+DEBUG(D_host_lookup)
+ debug_printf("using host_fake_gethostbyname for %s (%s)\n", name,
+ (af == AF_INET)? "IPv4" : "IPv6");
+
+/* Handle the name that needs a vast number of IP addresses */
+
+if (Ustrcmp(name, "manyhome.test.ex") == 0 && af == AF_INET)
+ {
+ int i, j;
+ yield = store_get(sizeof(struct hostent));
+ alist = store_get(2049 * sizeof(char *));
+ adds = store_get(2048 * alen);
+ yield->h_name = CS name;
+ yield->h_aliases = NULL;
+ yield->h_addrtype = af;
+ yield->h_length = alen;
+ yield->h_addr_list = CSS alist;
+ for (i = 104; i <= 111; i++)
+ {
+ for (j = 0; j <= 255; j++)
+ {
+ *alist++ = adds;
+ *adds++ = 10;
+ *adds++ = 250;
+ *adds++ = i;
+ *adds++ = j;
+ }
+ }
+ *alist = NULL;
+ return yield;
+ }
+
+/* Handle unqualified "localhost" */
+
+if (Ustrcmp(name, "localhost") == 0)
+ lname = (af == AF_INET)? US"127.0.0.1" : US"::1";
+
+/* Handle a literal IP address */
+
+ipa = string_is_ip_address(lname, NULL);
+if (ipa != 0)
+ {
+ if ((ipa == 4 && af == AF_INET) ||
+ (ipa == 6 && af == AF_INET6))
+ {
+ int i, n;
+ int x[4];
+ yield = store_get(sizeof(struct hostent));
+ alist = store_get(2 * sizeof(char *));
+ adds = store_get(alen);
+ yield->h_name = CS name;
+ yield->h_aliases = NULL;
+ yield->h_addrtype = af;
+ yield->h_length = alen;
+ yield->h_addr_list = CSS alist;
+ *alist++ = adds;
+ n = host_aton(lname, x);
+ for (i = 0; i < n; i++)
+ {
+ int y = x[i];
+ *adds++ = (y >> 24) & 255;
+ *adds++ = (y >> 16) & 255;
+ *adds++ = (y >> 8) & 255;
+ *adds++ = y & 255;
+ }
+ *alist = NULL;
+ }
+
+ /* Wrong kind of literal address */
+
+ else
+ {
+ *error_num = HOST_NOT_FOUND;
+ return NULL;
+ }
+ }
+
+/* Handle a host name */
+
+else
+ {
+ int type = (af == AF_INET)? T_A:T_AAAA;
+ int rc = dns_lookup(&dnsa, lname, type, NULL);
+ int count = 0;
+
+ switch(rc)
+ {
+ case DNS_SUCCEED: break;
+ case DNS_NOMATCH: *error_num = HOST_NOT_FOUND; return NULL;
+ case DNS_NODATA: *error_num = NO_DATA; return NULL;
+ case DNS_AGAIN: *error_num = TRY_AGAIN; return NULL;
+ default:
+ case DNS_FAIL: *error_num = NO_RECOVERY; return NULL;
+ }
+
+ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ rr != NULL;
+ rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
+ {
+ if (rr->type == type) count++;
+ }
+
+ yield = store_get(sizeof(struct hostent));
+ alist = store_get((count + 1) * sizeof(char **));
+ adds = store_get(count *alen);
+
+ yield->h_name = CS name;
+ yield->h_aliases = NULL;
+ yield->h_addrtype = af;
+ yield->h_length = alen;
+ yield->h_addr_list = CSS alist;
+
+ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ rr != NULL;
+ rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
+ {
+ int i, n;
+ int x[4];
+ dns_address *da;
+ if (rr->type != type) continue;
+ da = dns_address_from_rr(&dnsa, rr);
+ *alist++ = adds;
+ n = host_aton(da->address, x);
+ for (i = 0; i < n; i++)
+ {
+ int y = x[i];
+ *adds++ = (y >> 24) & 255;
+ *adds++ = (y >> 16) & 255;
+ *adds++ = (y >> 8) & 255;
+ *adds++ = y & 255;
+ }
+ }
+ *alist = NULL;
+ }
+
+return yield;
+}
+
+
+
projects / exim.git / blobdiff