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-rw-r--r--Makefile.inc4
-rw-r--r--ares.h2
-rw-r--r--ares_parse_txt_reply.c53
3 files changed, 38 insertions, 21 deletions
diff --git a/Makefile.inc b/Makefile.inc
index 1fe1129..e383ebb 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -24,7 +24,6 @@ CSOURCES = ares__close_sockets.c \
ares_parse_ptr_reply.c \
ares_parse_srv_reply.c \
ares_parse_txt_reply.c \
- ares_free_txt_reply.c \
ares_process.c \
ares_query.c \
ares_search.c \
@@ -83,6 +82,7 @@ MANPAGES = ares_cancel.3 \
ares_parse_ns_reply.3 \
ares_parse_ptr_reply.3 \
ares_parse_srv_reply.3 \
+ ares_parse_txt_reply.3 \
ares_process.3 \
ares_query.3 \
ares_save_options.3 \
@@ -117,6 +117,7 @@ HTMLPAGES = ares_cancel.html \
ares_parse_ns_reply.html \
ares_parse_ptr_reply.html \
ares_parse_srv_reply.html \
+ ares_parse_txt_reply.html \
ares_process.html \
ares_query.html \
ares_save_options.html \
@@ -151,6 +152,7 @@ PDFPAGES = ares_cancel.pdf \
ares_parse_ns_reply.pdf \
ares_parse_ptr_reply.pdf \
ares_parse_srv_reply.pdf \
+ ares_parse_txt_reply.pdf \
ares_process.pdf \
ares_query.pdf \
ares_save_options.pdf \
diff --git a/ares.h b/ares.h
index 35038d2..593a145 100644
--- a/ares.h
+++ b/ares.h
@@ -437,7 +437,7 @@ struct ares_srv_reply {
};
struct ares_txt_reply {
- unsigned int length;
+ size_t length; /* length excludes null termination */
unsigned char *txt;
};
diff --git a/ares_parse_txt_reply.c b/ares_parse_txt_reply.c
index c99ee72..6950912 100644
--- a/ares_parse_txt_reply.c
+++ b/ares_parse_txt_reply.c
@@ -1,4 +1,7 @@
+/* $Id$ */
+
/* Copyright (C) 2009 Jakub Hrozek <jhrozek@redhat.com>
+* Copyright (C) 2009 Yang Tse <yangsita@gmail.com>
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
@@ -38,18 +41,21 @@ int
ares_parse_txt_reply (const unsigned char *abuf, int alen,
struct ares_txt_reply **txt_out, int *ntxtreply)
{
- unsigned char substr_len = 0;
- unsigned char str_len = 0;
- unsigned int qdcount, ancount;
+ size_t substr_len, str_len;
+ unsigned int qdcount, ancount, i;
const unsigned char *aptr;
const unsigned char *strptr;
- 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_txt_reply *txt = NULL;
+ /* Set *txt_out to NULL for all failure cases. */
*txt_out = NULL;
+ /* Same with *nsrvreply. */
+ *ntxtreply = 0;
+
/* Give up if abuf doesn't have room for a header. */
if (alen < HFIXEDSZ)
return ARES_EBADRESP;
@@ -82,11 +88,16 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
free (hostname);
return ARES_ENOMEM;
}
- /* Zero out so we can safely free txt.txt even if NULL */
- memset(txt, 0, ancount * sizeof (struct ares_txt_reply));
+
+ /* 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 < (int) ancount; i++)
+ for (i = 0; i < ancount; i++)
{
/* Decode the RR up to the data field. */
status = ares_expand_name (aptr, abuf, alen, &rr_name, &len);
@@ -116,18 +127,17 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
* substrings contained therein.
*/
- /* Realloc would be expensive, compute the total length */
- txt[i].length = 0;
+ /* Compute total length to allow a single memory allocation */
strptr = aptr;
while (strptr < (aptr + rr_len))
{
- memcpy ((void *) &substr_len, strptr, sizeof (unsigned char));
+ substr_len = (unsigned char)*strptr;
txt[i].length += substr_len;
strptr += substr_len + 1;
}
/* Including null byte */
- txt[i].txt = malloc (sizeof (unsigned char) * (txt[i].length + 1));
+ txt[i].txt = malloc (txt[i].length + 1);
if (txt[i].txt == NULL)
{
status = ARES_ENOMEM;
@@ -135,15 +145,13 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
}
/* Step through the list of substrings, concatenating them */
- substr_len = 0;
str_len = 0;
strptr = aptr;
while (strptr < (aptr + rr_len))
{
- memcpy ((void *) &substr_len, strptr, sizeof (unsigned char));
+ substr_len = (unsigned char)*strptr;
strptr++;
- memcpy ((void *) txt[i].txt + str_len, strptr,
- sizeof (unsigned char) * substr_len);
+ memcpy ((char *) txt[i].txt + str_len, strptr, substr_len);
str_len += substr_len;
strptr += substr_len;
}
@@ -159,18 +167,25 @@ ares_parse_txt_reply (const unsigned char *abuf, int alen,
rr_name = NULL;
}
- free (hostname);
- free (rr_name);
+ if (hostname);
+ free (hostname);
+ if (rr_name);
+ free (rr_name);
/* clean up on error */
if (status != ARES_SUCCESS)
{
- ares_free_txt_reply(txt, ancount);
+ for (i = 0; i < ancount; i++)
+ {
+ if (txt[i].txt)
+ free (txt[i].txt);
+ }
return status;
}
/* everything looks fine, return the data */
*txt_out = txt;
*ntxtreply = ancount;
- return 0;
+
+ return ARES_SUCCESS;
}