Jakub Hrozek modified ares_parse_srv_reply() and ares_parse_txt_reply() API

to return a linked lists of results. These were also modified to internally
use the ares_data memory struct and as such its result must be free'ed with
ares_free_data().

4 files changed, 78 insertions, 76 deletions

diff --git a/ares.h b/ares.h
index d2b6cec..9f4feeb 100644
--- a/ares.h
+++ b/ares.h
@@ -476,13 +476,11 @@ CARES_EXTERN int ares_parse_ns_reply(const unsigned char *abuf,
 
 CARES_EXTERN int ares_parse_srv_reply(const unsigned char* abuf,
                                       int alen,
-                                      struct ares_srv_reply** srv_out,
-                                      int *nsrvreply);
+                                      struct ares_srv_reply** srv_out);
 
 CARES_EXTERN int ares_parse_txt_reply(const unsigned char* abuf,
                                       int alen,
-                                      struct ares_txt_reply** txt_out,
-                                      int *nsrvreply);
+                                      struct ares_txt_reply** txt_out);
 
 CARES_EXTERN void ares_free_string(void *str);
 
diff --git a/ares_data.c b/ares_data.c
index 5d710ee..16a5cc50 100644
--- a/ares_data.c
+++ b/ares_data.c
@@ -34,7 +34,8 @@
 ** of c-ares functions returning pointers that must be free'ed using this
 ** function is:
 **
-**   FIXME: specify function list.
+**   ares_parse_srv_reply()
+**   ares_parse_txt_reply()
 */
 
 void ares_free_data(void *dataptr)
diff --git a/ares_parse_srv_reply.c b/ares_parse_srv_reply.c
index 8833310..e296a98 100644
--- a/ares_parse_srv_reply.c
+++ b/ares_parse_srv_reply.c
@@ -1,6 +1,7 @@
-/* Id$ */
+/* $Id$ */
 
 /* Copyright 1998 by the Massachusetts Institute of Technology.
+ * Copyright (C) 2009 by Jakub Hrozek <jhrozek@redhat.com>
  *
  * Permission to use, copy, modify, and distribute this
  * software and its documentation for any purpose and without
@@ -15,11 +16,6 @@
  * without express or implied warranty.
  */
 
-/*
- * ares_parse_srv_reply created by Jakub Hrozek <jhrozek@redhat.com>
- *      on behalf of Red Hat - http://www.redhat.com
- */
-
 #include "ares_setup.h"
 
 #ifdef HAVE_SYS_SOCKET_H
@@ -47,6 +43,7 @@
 #include <string.h>
 #include "ares.h"
 #include "ares_dns.h"
+#include "ares_data.h"
 #include "ares_private.h"
 
 /* AIX portability check */
@@ -56,21 +53,20 @@
 
 int
 ares_parse_srv_reply (const unsigned char *abuf, int alen,
-                      struct ares_srv_reply **srv_out, int *nsrvreply)
+                      struct ares_srv_reply **srv_out)
 {
-  unsigned int qdcount, ancount;
+  unsigned int qdcount, ancount, i;
   const unsigned char *aptr;
-  int status, i, rr_type, rr_class, rr_len;
+  int status, rr_type, rr_class, rr_len;
   long len;
   char *hostname = NULL, *rr_name = NULL;
-  struct ares_srv_reply *srv = NULL;
+  struct ares_srv_reply *srv_head = NULL;
+  struct ares_srv_reply *srv_last = NULL;
+  struct ares_srv_reply *srv_curr;
 
   /* Set *srv_out to NULL for all failure cases. */
   *srv_out = NULL;
 
-  /* Same with *nsrvreply. */
-  *nsrvreply = 0;
-
   /* Give up if abuf doesn't have room for a header. */
   if (alen < HFIXEDSZ)
     return ARES_EBADRESP;
@@ -96,14 +92,6 @@ ares_parse_srv_reply (const unsigned char *abuf, int alen,
     }
   aptr += len + QFIXEDSZ;
 
-  /* Allocate ares_srv_reply array; ancount gives an upper bound */
-  srv = malloc ((ancount) * sizeof (struct ares_srv_reply));
-  if (!srv)
-    {
-      free (hostname);
-      return ARES_ENOMEM;
-    }
-
   /* Examine each answer resource record (RR) in turn. */
   for (i = 0; i < (int) ancount; i++)
     {
@@ -134,40 +122,58 @@ ares_parse_srv_reply (const unsigned char *abuf, int alen,
               break;
             }
 
-          srv[i].priority = ntohs (*((unsigned short *)aptr));
+          /* Allocate storage for this SRV answer appending it to the list */
+          srv_curr = ares_malloc_data(ARES_DATATYPE_SRV_REPLY);
+          if (!srv_curr)
+            {
+              status = ARES_ENOMEM;
+              break;
+            }
+          if (srv_last)
+            {
+              srv_last->next = srv_curr;
+            }
+          else
+            {
+              srv_head = srv_curr;
+            }
+          srv_last = srv_curr;
+
+          srv_curr->priority = ntohs (*((unsigned short *)aptr));
           aptr += sizeof(unsigned short);
-          srv[i].weight = ntohs (*((unsigned short *)aptr));
+          srv_curr->weight = ntohs (*((unsigned short *)aptr));
           aptr += sizeof(unsigned short);
-          srv[i].port = ntohs (*((unsigned short *)aptr));
+          srv_curr->port = ntohs (*((unsigned short *)aptr));
           aptr += sizeof(unsigned short);
 
-          status = ares_expand_name (aptr, abuf, alen, &srv[i].host, &len);
+          status = ares_expand_name (aptr, abuf, alen, &srv_curr->host, &len);
           if (status != ARES_SUCCESS)
             break;
 
           /* Move on to the next record */
           aptr += len;
-
-          /* Don't lose memory in the next iteration */
-          free (rr_name);
-          rr_name = NULL;
         }
+
+      /* Don't lose memory in the next iteration */
+      free (rr_name);
+      rr_name = NULL;
     }
 
+  if (hostname)
+    free (hostname);
+  if (rr_name)
+    free (rr_name);
+
   /* clean up on error */
   if (status != ARES_SUCCESS)
     {
-      free (srv);
-      free (hostname);
-      free (rr_name);
+      if (srv_head)
+        ares_free_data (srv_head);
       return status;
     }
 
   /* everything looks fine, return the data */
-  *srv_out = srv;
-  *nsrvreply = ancount;
+  *srv_out = srv_head;
 
-  free (hostname);
-  free (rr_name);
-  return status;
+  return ARES_SUCCESS;
 }
diff --git a/ares_parse_txt_reply.c b/ares_parse_txt_reply.c
index 583b64f..465a387 100644
--- a/ares_parse_txt_reply.c
+++ b/ares_parse_txt_reply.c
@@ -1,8 +1,7 @@
 /* $Id$ */
 
 /* Copyright 1998 by the Massachusetts Institute of Technology.
- * Copyright (C) 2009 Jakub Hrozek <jhrozek@redhat.com>
- * Copyright (C) 2009 Yang Tse <yangsita@gmail.com>
+ * Copyright (C) 2009 by Jakub Hrozek <jhrozek@redhat.com>
  *
  * Permission to use, copy, modify, and distribute this
  * software and its documentation for any purpose and without
@@ -49,11 +48,12 @@
 
 #include "ares.h"
 #include "ares_dns.h"
+#include "ares_data.h"
 #include "ares_private.h"
 
 int
 ares_parse_txt_reply (const unsigned char *abuf, int alen,
-                      struct ares_txt_reply **txt_out, int *ntxtreply)
+                      struct ares_txt_reply **txt_out)
 {
   size_t substr_len, str_len;
   unsigned int qdcount, ancount, i;
@@ -62,14 +62,13 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
   int status, rr_type, rr_class, rr_len;
   long len;
   char *hostname = NULL, *rr_name = NULL;
-  struct ares_txt_reply *txt = NULL;
+  struct ares_txt_reply *txt_head = NULL;
+  struct ares_txt_reply *txt_last = NULL;
+  struct ares_txt_reply *txt_curr;
 
   /* Set *txt_out to NULL for all failure cases. */
   *txt_out = NULL;
 
-  /* Same with *ntxtreply. */
-  *ntxtreply = 0;
-
   /* Give up if abuf doesn't have room for a header. */
   if (alen < HFIXEDSZ)
     return ARES_EBADRESP;
@@ -95,21 +94,6 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
     }
   aptr += len + QFIXEDSZ;
 
-  /* Allocate ares_txt_reply array; ancount gives an upper bound */
-  txt = malloc ((ancount) * sizeof (struct ares_txt_reply));
-  if (!txt)
-    {
-      free (hostname);
-      return ARES_ENOMEM;
-    }
-
-  /* Initialize ares_txt_reply array */
-  for (i = 0; i < ancount; i++)
-    {
-      txt[i].txt = NULL;
-      txt[i].length = 0;
-    }
-
   /* Examine each answer resource record (RR) in turn. */
   for (i = 0; i < ancount; i++)
     {
@@ -133,6 +117,23 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
       /* Check if we are really looking at a TXT record */
       if (rr_class == C_IN && rr_type == T_TXT)
         {
+          /* Allocate storage for this SRV answer appending it to the list */
+          txt_curr = ares_malloc_data(ARES_DATATYPE_TXT_REPLY);
+          if (!txt_curr)
+            {
+              status = ARES_ENOMEM;
+              break;
+            }
+          if (txt_last)
+            {
+              txt_last->next = txt_curr;
+            }
+          else
+            {
+              txt_head = txt_curr;
+            }
+          txt_last = txt_curr;
+
           /*
            * There may be multiple substrings in a single TXT record. Each
            * substring may be up to 255 characters in length, with a
@@ -146,13 +147,13 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
           while (strptr < (aptr + rr_len))
             {
               substr_len = (unsigned char)*strptr;
-              txt[i].length += substr_len;
+              txt_curr->length += substr_len;
               strptr += substr_len + 1;
             }
 
           /* Including null byte */
-          txt[i].txt = malloc (txt[i].length + 1);
-          if (txt[i].txt == NULL)
+          txt_curr->txt = malloc (txt_curr->length + 1);
+          if (txt_curr->txt == NULL)
             {
               status = ARES_ENOMEM;
               break;
@@ -165,12 +166,12 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
             {
               substr_len = (unsigned char)*strptr;
               strptr++;
-              memcpy ((char *) txt[i].txt + str_len, strptr, substr_len);
+              memcpy ((char *) txt_curr->txt + str_len, strptr, substr_len);
               str_len += substr_len;
               strptr += substr_len;
             }
           /* Make sure we NULL-terminate */
-          txt[i].txt[txt[i].length] = '\0';
+          *((char *) txt_curr->txt + txt_curr->length) = '\0';
 
           /* Move on to the next record */
           aptr += rr_len;
@@ -189,17 +190,13 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
   /* clean up on error */
   if (status != ARES_SUCCESS)
     {
-    for (i = 0; i < ancount; i++)
-      {
-        if (txt[i].txt)
-          free (txt[i].txt);
-      }
+      if (txt_head)
+        ares_free_data (txt_head);
       return status;
     }
 
   /* everything looks fine, return the data */
-  *txt_out = txt;
-  *ntxtreply = ancount;
+  *txt_out = txt_head;
 
   return ARES_SUCCESS;
 }