X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/b09c17939112f84e689a9c1343f00ca84610325d..1d28cc061677bd07d9bed48dd84bd5c590247043:/src/src/lookups/dnsdb.c

diff --git a/src/src/lookups/dnsdb.c b/src/src/lookups/dnsdb.c
index 272734456..5482cd9d1 100644
--- a/src/src/lookups/dnsdb.c
+++ b/src/src/lookups/dnsdb.c
@@ -2,8 +2,10 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
 /* Copyright (c) University of Cambridge 1995 - 2018 */
 /* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #include "../exim.h"
 #include "lf_functions.h"
@@ -77,10 +79,8 @@ static int type_values[] = {
 /* See local README for interface description. */
 
 static void *
-dnsdb_open(uschar *filename, uschar **errmsg)
+dnsdb_open(const uschar * filename, uschar **errmsg)
 {
-filename = filename;   /* Keep picky compilers happy */
-errmsg = errmsg;       /* Ditto */
 return (void *)(-1);   /* Any non-0 value */
 }
 
@@ -112,7 +112,7 @@ terminates option processing.  Recognised options are:
 causes the whole lookup to defer only if none of the DNS queries succeeds; and
 'never', where all defers are as if the lookup failed. The default is 'lax'.
 
-- 'dnssec_FOO', with 'strict', 'lax' and 'never' (default).  The meanings are
+- 'dnssec_FOO', with 'strict', 'lax' (default), and 'never'.  The meanings are
 require, try and don't-try dnssec respectively.
 
 - 'retrans_VAL', set the timeout value.  VAL is an Exim time specification
@@ -130,13 +130,14 @@ which may start with '<' in order to set a specific separator. The default
 separator, as always, is colon. */
 
 static int
-dnsdb_find(void *handle, uschar *filename, const uschar *keystring, int length,
-  uschar **result, uschar **errmsg, uint *do_cache)
+dnsdb_find(void * handle, const uschar * filename, const uschar * keystring,
+ int length, uschar ** result, uschar ** errmsg, uint * do_cache,
+ const uschar * opts)
 {
 int rc;
 int sep = 0;
 int defer_mode = PASS;
-int dnssec_mode = OK;
+int dnssec_mode = PASS;
 int save_retrans = dns_retrans;
 int save_retry =   dns_retry;
 int type;
@@ -153,11 +154,6 @@ store as possible later, so we preallocate the result here */
 
 gstring * yield = string_get(256);
 
-handle = handle;           /* Keep picky compilers happy */
-filename = filename;
-length = length;
-do_cache = do_cache;
-
 /* If the string starts with '>' we change the output separator.
 If it's followed by ';' or ',' we set the TXT output separator. */
 
@@ -195,7 +191,8 @@ for (;;)
     else
       {
       *errmsg = US"unsupported dnsdb defer behaviour";
-      return DEFER;
+      rc = DEFER;
+      goto out;
       }
     }
   else if (strncmpic(keystring, US"dnssec_", 7) == 0)
@@ -210,7 +207,8 @@ for (;;)
     else
       {
       *errmsg = US"unsupported dnsdb dnssec behaviour";
-      return DEFER;
+      rc = DEFER;
+      goto out;
       }
     }
   else if (strncmpic(keystring, US"retrans_", 8) == 0)
@@ -219,7 +217,8 @@ for (;;)
     if ((timeout_sec = readconf_readtime(keystring += 8, ',', FALSE)) <= 0)
       {
       *errmsg = US"unsupported dnsdb timeout value";
-      return DEFER;
+      rc = DEFER;
+      goto out;
       }
     dns_retrans = timeout_sec;
     while (*keystring != ',') keystring++;
@@ -230,7 +229,8 @@ for (;;)
     if ((retries = (int)strtol(CCS keystring + 6, CSS &keystring, 0)) < 0)
       {
       *errmsg = US"unsupported dnsdb retry count";
-      return DEFER;
+      rc = DEFER;
+      goto out;
       }
     dns_retry = retries;
     }
@@ -241,7 +241,8 @@ for (;;)
   if (*keystring++ != ',')
     {
     *errmsg = US"dnsdb modifier syntax error";
-    return DEFER;
+    rc = DEFER;
+    goto out;
     }
   while (isspace(*keystring)) keystring++;
   }
@@ -269,7 +270,8 @@ if ((equals = Ustrchr(keystring, '=')) != NULL)
   if (i >= nelem(type_names))
     {
     *errmsg = US"unsupported DNS record type";
-    return DEFER;
+    rc = DEFER;
+    goto out;
     }
 
   keystring = equals + 1;
@@ -312,7 +314,6 @@ if (!outsep2) switch(type)
 
 while ((domain = string_nextinlist(&keystring, &sep, NULL, 0)))
   {
-  uschar rbuffer[256];
   int searchtype = type == T_CSA ? T_SRV :         /* record type we want */
                    type == T_MXH ? T_MX :
                    type == T_ZNS ? T_NS : type;
@@ -325,10 +326,7 @@ while ((domain = string_nextinlist(&keystring, &sep, NULL, 0)))
 
   if ((type == T_PTR || type == T_CSA) &&
       string_is_ip_address(domain, NULL) != 0)
-    {
-    dns_build_reverse(domain, rbuffer);
-    domain = rbuffer;
-    }
+    domain = dns_build_reverse(domain);
 
   do
     {
@@ -368,7 +366,8 @@ while ((domain = string_nextinlist(&keystring, &sep, NULL, 0)))
 	dns_retrans = save_retrans;
 	dns_retry = save_retry;
 	dns_init(FALSE, FALSE, FALSE);			/* clr dnssec bit */
-	return DEFER;					/* always defer */
+	rc = DEFER;					/* always defer */
+	goto out;
 	}
       if (defer_mode == PASS) failrc = DEFER;         /* defer only if all do */
       continue;                                       /* treat defer as fail */
@@ -558,10 +557,18 @@ dns_retrans = save_retrans;
 dns_retry = save_retry;
 dns_init(FALSE, FALSE, FALSE);	/* clear the dnssec bit for getaddrbyname */
 
-if (!yield || !yield->ptr) return failrc;
+if (!yield || !yield->ptr)
+  rc = failrc;
+else
+  {
+  *result = string_from_gstring(yield);
+  rc = OK;
+  }
+
+out:
 
-*result = string_from_gstring(yield);
-return OK;
+store_free_dns_answer(dnsa);
+return rc;
 }
 
 
@@ -574,25 +581,26 @@ return OK;
 
 #include "../version.h"
 
-void
-dnsdb_version_report(FILE *f)
+gstring *
+dnsdb_version_report(gstring * g)
 {
 #ifdef DYNLOOKUP
-fprintf(f, "Library version: DNSDB: Exim version %s\n", EXIM_VERSION_STR);
+g = string_fmt_append(g, "Library version: DNSDB: Exim version %s\n", EXIM_VERSION_STR);
 #endif
+return g;
 }
 
 
 static lookup_info _lookup_info = {
-  US"dnsdb",                     /* lookup name */
-  lookup_querystyle,             /* query style */
-  dnsdb_open,                    /* open function */
-  NULL,                          /* check function */
-  dnsdb_find,                    /* find function */
-  NULL,                          /* no close function */
-  NULL,                          /* no tidy function */
-  NULL,                          /* no quoting function */
-  dnsdb_version_report           /* version reporting */
+  .name = US"dnsdb",			/* lookup name */
+  .type = lookup_querystyle,		/* query style */
+  .open = dnsdb_open,			/* open function */
+  .check = NULL,			/* check function */
+  .find = dnsdb_find,			/* find function */
+  .close = NULL,			/* no close function */
+  .tidy = NULL,				/* no tidy function */
+  .quote = NULL,			/* no quoting function */
+  .version_report = dnsdb_version_report           /* version reporting */
 };
 
 #ifdef DYNLOOKUP