X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fsrc%2Fhost.c;h=4e1cb8a4578e1fb0de4f39e08a14a8289e9e825a;hb=191d76b569c84b5664e47949727bf88ae0c978a9;hp=aa142eb9b4ef2997035f8d0e2c1beeea7682a997;hpb=30795c5e77e21e90f3c695e6274bc9b4a9b68900;p=user%2Fhenk%2Fcode%2Fexim.git

diff --git a/src/src/host.c b/src/src/host.c
index aa142eb9b..4e1cb8a45 100644
--- a/src/src/host.c
+++ b/src/src/host.c
@@ -3,6 +3,7 @@
 *************************************************/
 
 /* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Functions for finding hosts, either by gethostbyname(), gethostbyaddr(), or
@@ -182,19 +183,18 @@ dns_scan dnss;
 
 DEBUG(D_host_lookup)
   debug_printf("using host_fake_gethostbyname for %s (%s)\n", name,
-    (af == AF_INET)? "IPv4" : "IPv6");
+    af == AF_INET ? "IPv4" : "IPv6");
 
 /* Handle unqualified "localhost" */
 
 if (Ustrcmp(name, "localhost") == 0)
-  lname = (af == AF_INET)? US"127.0.0.1" : US"::1";
+  lname = af == AF_INET ? US"127.0.0.1" : US"::1";
 
 /* Handle a literal IP address */
 
 if ((ipa = string_is_ip_address(lname, NULL)) != 0)
-  {
-  if ((ipa == 4 && af == AF_INET) ||
-      (ipa == 6 && af == AF_INET6))
+  if (   ipa == 4 && af == AF_INET
+     ||  ipa == 6 && af == AF_INET6)
     {
     int x[4];
     yield = store_get(sizeof(struct hostent), FALSE);
@@ -224,13 +224,12 @@ if ((ipa = string_is_ip_address(lname, NULL)) != 0)
     *error_num = HOST_NOT_FOUND;
     return NULL;
     }
-  }
 
 /* Handle a host name */
 
 else
   {
-  int type = (af == AF_INET)? T_A:T_AAAA;
+  int type = af == AF_INET ? T_A:T_AAAA;
   int rc = dns_lookup_timerwrap(dnsa, lname, type, NULL);
   int count = 0;
 
@@ -729,6 +728,7 @@ host_build_ifacelist(const uschar *list, uschar *name)
 int sep = 0;
 uschar *s;
 ip_address_item * yield = NULL, * last = NULL, * next;
+BOOL taint = is_tainted(list);
 
 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
   {
@@ -747,7 +747,7 @@ while ((s = string_nextinlist(&list, &sep, NULL, 0)))
   address above. The field in the ip_address_item is large enough to hold an
   IPv6 address. */
 
-  next = store_get(sizeof(ip_address_item), FALSE);
+  next = store_get(sizeof(ip_address_item), taint);
   next->next = NULL;
   Ustrcpy(next->address, s);
   next->port = port;
@@ -1646,7 +1646,6 @@ int old_pool, rc;
 int sep = 0;
 uschar *save_hostname;
 uschar **aliases;
-uschar buffer[256];
 uschar *ordername;
 const uschar *list = host_lookup_order;
 dns_answer * dnsa = store_get_dns_answer();
@@ -1672,13 +1671,14 @@ if (f.running_in_test_harness &&
 /* Do lookups directly in the DNS or via gethostbyaddr() (or equivalent), in
 the order specified by the host_lookup_order option. */
 
-while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
+while ((ordername = string_nextinlist(&list, &sep, NULL, 0)))
   {
   if (strcmpic(ordername, US"bydns") == 0)
     {
+    uschar * name = dns_build_reverse(sender_host_address);
+
     dns_init(FALSE, FALSE, FALSE);    /* dnssec ctrl by dns_dnssec_ok glbl */
-    dns_build_reverse(sender_host_address, buffer);
-    rc = dns_lookup_timerwrap(dnsa, buffer, T_PTR, NULL);
+    rc = dns_lookup_timerwrap(dnsa, name, T_PTR, NULL);
 
     /* The first record we come across is used for the name; others are
     considered to be aliases. We have to scan twice, in order to find out the
@@ -1946,8 +1946,13 @@ host_find_byname(host_item *host, const uschar *ignore_target_hosts, int flags,
 int yield, times;
 host_item *last = NULL;
 BOOL temp_error = FALSE;
-#if HAVE_IPV6
 int af;
+
+#ifndef DISABLE_TLS
+/* Copy the host name at this point to the value which is used for
+TLS certificate name checking, before anything modifies it.  */
+
+host->certname = host->name;
 #endif
 
 /* Make sure DNS options are set as required. This appears to be necessary in
@@ -1967,10 +1972,10 @@ lookups here (except when testing standalone). */
   #ifdef STAND_ALONE
   if (disable_ipv6)
   #else
-  if (disable_ipv6 ||
-    (dns_ipv4_lookup != NULL &&
-        match_isinlist(host->name, CUSS &dns_ipv4_lookup, 0, NULL, NULL,
-	  MCL_DOMAIN, TRUE, NULL) == OK))
+  if (  disable_ipv6
+     ||    dns_ipv4_lookup
+	&& match_isinlist(host->name, CUSS &dns_ipv4_lookup, 0, NULL, NULL,
+	    MCL_DOMAIN, TRUE, NULL) == OK)
   #endif
 
     { af = AF_INET; times = 1; }
@@ -1980,7 +1985,7 @@ lookups here (except when testing standalone). */
 /* No IPv6 support */
 
 #else   /* HAVE_IPV6 */
-  times = 1;
+  af = AF_INET; times = 1;
 #endif  /* HAVE_IPV6 */
 
 /* Initialize the flag that gets set for DNS syntax check errors, so that the
@@ -2022,7 +2027,7 @@ for (int i = 1; i <= times;
 
   #else    /* not HAVE_IPV6 */
   if (f.running_in_test_harness)
-    hostdata = host_fake_gethostbyname(host->name, AF_INET, &error_num);
+    hostdata = host_fake_gethostbyname(host->name, af, &error_num);
   else
     {
     hostdata = gethostbyname(CS host->name);
@@ -2034,45 +2039,44 @@ for (int i = 1; i <= times;
       && (time_msec = get_time_in_ms() - time_msec) > slow_lookup_log)
     log_long_lookup(US"gethostbyname", host->name, time_msec);
 
-  if (hostdata == NULL)
+  if (!hostdata)
     {
-    uschar *error;
+    uschar * error;
     switch (error_num)
       {
-      case HOST_NOT_FOUND: error = US"HOST_NOT_FOUND"; break;
-      case TRY_AGAIN:      error = US"TRY_AGAIN"; break;
-      case NO_RECOVERY:    error = US"NO_RECOVERY"; break;
-      case NO_DATA:        error = US"NO_DATA"; break;
-      #if NO_DATA != NO_ADDRESS
-      case NO_ADDRESS:     error = US"NO_ADDRESS"; break;
-      #endif
+      case HOST_NOT_FOUND: error = US"HOST_NOT_FOUND";	break;
+      case TRY_AGAIN:      error = US"TRY_AGAIN";   temp_error = TRUE; break;
+      case NO_RECOVERY:    error = US"NO_RECOVERY"; temp_error = TRUE; break;
+      case NO_DATA:        error = US"NO_DATA";		break;
+    #if NO_DATA != NO_ADDRESS
+      case NO_ADDRESS:     error = US"NO_ADDRESS";	break;
+    #endif
       default: error = US"?"; break;
       }
 
-    DEBUG(D_host_lookup) debug_printf("%s returned %d (%s)\n",
-      #if HAVE_IPV6
-        #if HAVE_GETIPNODEBYNAME
-        (af == AF_INET6)? "getipnodebyname(af=inet6)" : "getipnodebyname(af=inet)",
-        #else
-        (af == AF_INET6)? "gethostbyname2(af=inet6)" : "gethostbyname2(af=inet)",
-        #endif
-      #else
-      "gethostbyname",
-      #endif
-      error_num, error);
+    DEBUG(D_host_lookup) debug_printf("%s(af=%s) returned %d (%s)\n",
+      f.running_in_test_harness ? "host_fake_gethostbyname" :
+#if HAVE_IPV6
+# if HAVE_GETIPNODEBYNAME
+        "getipnodebyname",
+# else
+        "gethostbyname2",
+# endif
+#else
+	"gethostbyname",
+#endif
+      af == AF_INET ? "inet" : "inet6", error_num, error);
 
-    if (error_num == TRY_AGAIN || error_num == NO_RECOVERY) temp_error = TRUE;
     continue;
     }
-  if ((hostdata->h_addr_list)[0] == NULL) continue;
+  if (!(hostdata->h_addr_list)[0]) continue;
 
   /* Replace the name with the fully qualified one if necessary, and fill in
   the fully_qualified_name pointer. */
 
-  if (hostdata->h_name[0] != 0 &&
-      Ustrcmp(host->name, hostdata->h_name) != 0)
+  if (hostdata->h_name[0] && Ustrcmp(host->name, hostdata->h_name) != 0)
     host->name = string_copy_dnsdomain(US hostdata->h_name);
-  if (fully_qualified_name != NULL) *fully_qualified_name = host->name;
+  if (fully_qualified_name) *fully_qualified_name = host->name;
 
   /* Get the list of addresses. IPv4 and IPv6 addresses can be distinguished
   by their different lengths. Scan the list, ignoring any that are to be
@@ -2086,9 +2090,9 @@ for (int i = 1; i <= times;
       host_ntoa(ipv4_addr? AF_INET:AF_INET6, *addrlist, NULL, NULL);
 
     #ifndef STAND_ALONE
-    if (ignore_target_hosts != NULL &&
-        verify_check_this_host(&ignore_target_hosts, NULL, host->name,
-          text_address, NULL) == OK)
+    if (  ignore_target_hosts
+       && verify_check_this_host(&ignore_target_hosts, NULL, host->name,
+	    text_address, NULL) == OK)
       {
       DEBUG(D_host_lookup)
         debug_printf("ignored host %s [%s]\n", host->name, text_address);
@@ -2096,10 +2100,10 @@ for (int i = 1; i <= times;
       }
     #endif
 
-    /* If this is the first address, last == NULL and we put the data in the
+    /* If this is the first address, last is NULL and we put the data in the
     original block. */
 
-    if (last == NULL)
+    if (!last)
       {
       host->address = text_address;
       host->port = PORT_NONE;
@@ -2116,6 +2120,9 @@ for (int i = 1; i <= times;
       {
       host_item *next = store_get(sizeof(host_item), FALSE);
       next->name = host->name;
+#ifndef DISABLE_TLS
+      next->certname = host->certname;
+#endif
       next->mx = host->mx;
       next->address = text_address;
       next->port = PORT_NONE;
@@ -2134,12 +2141,12 @@ for (int i = 1; i <= times;
 NULL. If temp_error is set, at least one of the lookups gave a temporary error,
 so we pass that back. */
 
-if (host->address == NULL)
+if (!host->address)
   {
   uschar *msg =
     #ifndef STAND_ALONE
-    (message_id[0] == 0 && smtp_in != NULL)?
-      string_sprintf("no IP address found for host %s (during %s)", host->name,
+    !message_id[0] && smtp_in
+      ? string_sprintf("no IP address found for host %s (during %s)", host->name,
           smtp_get_connection_info()) :
     #endif
     string_sprintf("no IP address found for host %s", host->name);
@@ -2259,6 +2266,13 @@ BOOL v6_find_again = FALSE;
 BOOL dnssec_fail = FALSE;
 int i;
 
+#ifndef DISABLE_TLS
+/* Copy the host name at this point to the value which is used for
+TLS certificate name checking, before any CNAME-following modifies it.  */
+
+host->certname = host->name;
+#endif
+
 /* If allow_ip is set, a name which is an IP address returns that value
 as its address. This is used for MX records when allow_mx_to_ip is set, for
 those sites that feel they have to flaunt the RFC rules. */
@@ -3179,7 +3193,7 @@ BOOL sec;
 rc = dns_lookup_timerwrap(dnsa, buffer, T_TLSA, &fullname);
 sec = dns_is_secure(dnsa);
 DEBUG(D_transport)
-  debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
+  debug_printf("TLSA lookup ret %s %sDNSSEC\n", dns_rc_names[rc], sec ? "" : "not ");
 
 switch (rc)
   {