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- Sebastian made c-ares able to return all PTR-records when doing reverse

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lookups. It is not common practice to have multiple PTR-Records for a single
  IP, but its perfectly legal and some sites have those.
This commit is contained in:
Daniel Stenberg 2008-05-07 21:20:45 +00:00
parent 9026dc2da4
commit 836fa69e2e
2 changed files with 31 additions and 2 deletions
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4
ares/CHANGES
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@ -2,6 +2,10 @@
* May 7 2008 (Daniel Stenberg)
- Sebastian made c-ares able to return all PTR-records when doing reverse
lookups. It is not common practice to have multiple PTR-Records for a single
IP, but its perfectly legal and some sites have those.
- Doug Goldstein provided a configure patch: updates autoconf 2.13 usage to
autoconf 2.57 usage (which is the version you have specified as the minimum
version). It's a minor change but it does clean up some warnings with newer

29
ares/ares_parse_ptr_reply.c
View File

@ -44,6 +44,8 @@ int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
const unsigned char *aptr;
char *ptrname, *hostname, *rr_name, *rr_data;
struct hostent *hostent;
int aliascnt = 0;
char ** aliases;
/* Set *host to NULL for all failure cases. */
*host = NULL;
@ -72,6 +74,12 @@ int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
/* Examine each answer resource record (RR) in turn. */
hostname = NULL;
aliases = (char **) malloc(8 * sizeof(char *));
if (!aliases)
{
free(ptrname);
return ARES_ENOMEM;
}
for (i = 0; i < (int)ancount; i++)
{
/* Decode the RR up to the data field. */
@ -99,6 +107,16 @@ int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
if (hostname)
free(hostname);
hostname = rr_data;
aliases[aliascnt] = malloc((strlen(rr_data)+1) * sizeof(char *));
if (!aliases[aliascnt])
{
status = ARES_ENOMEM;
break;
}
strncpy(aliases[aliascnt], rr_data, strlen(rr_data)+1);
aliascnt++;
if ((aliascnt%8)==0)
aliases = (char **) realloc(aliases, (aliascnt/16+1) * sizeof(char *));
}
if (rr_class == C_IN && rr_type == T_CNAME)
@ -134,17 +152,20 @@ int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
hostent->h_addr_list[0] = malloc(addrlen);
if (hostent->h_addr_list[0])
{
hostent->h_aliases = malloc(sizeof (char *));
hostent->h_aliases = malloc((aliascnt+1) * sizeof (char *));
if (hostent->h_aliases)
{
/* Fill in the hostent and return successfully. */
hostent->h_name = hostname;
hostent->h_aliases[0] = NULL;
for (i=0 ; i<aliascnt ; i++)
hostent->h_aliases[i] = aliases[i];
hostent->h_aliases[aliascnt] = NULL;
hostent->h_addrtype = family;
hostent->h_length = addrlen;
memcpy(hostent->h_addr_list[0], addr, addrlen);
hostent->h_addr_list[1] = NULL;
*host = hostent;
free(aliases);
free(ptrname);
return ARES_SUCCESS;
}
@ -156,6 +177,10 @@ int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
}
status = ARES_ENOMEM;
}
for (i=0 ; i<aliascnt ; i++)
if (aliases[i])
free(aliases[i]);
free(aliases);
if (hostname)
free(hostname);
free(ptrname);