Update c-ares from 0.16.1 to 0.17.2

MAKEAYAMLHAPPY-12345

ref:6a83ac3af883b2fc963128b7993f0a467b0000cb

1 files changed, 243 insertions, 0 deletions

diff --git a/contrib/libs/c-ares/src/lib/ares_parse_ptr_reply.c b/contrib/libs/c-ares/src/lib/ares_parse_ptr_reply.c
new file mode 100644
index 0000000000..060a2019e2
--- /dev/null
+++ b/contrib/libs/c-ares/src/lib/ares_parse_ptr_reply.c
@@ -0,0 +1,243 @@
+
+/* Copyright 1998 by the Massachusetts Institute of Technology.
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ */
+
+#include "ares_setup.h"
+
+#ifdef HAVE_NETINET_IN_H
+#  include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+#  include <netdb.h>
+#endif
+
+#include "ares_nameser.h"
+
+#ifdef HAVE_STRINGS_H
+#  include <strings.h>
+#endif
+
+#ifdef HAVE_LIMITS_H
+#  include <limits.h>
+#endif
+
+#include "ares.h"
+#include "ares_dns.h"
+#include "ares_nowarn.h"
+#include "ares_private.h"
+
+int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
+                         int addrlen, int family, struct hostent **host,
+                         int *hostttl)
+{
+  unsigned int qdcount, ancount;
+  int status, i, rr_type, rr_class, rr_len, rr_ttl;
+  long len;
+  const unsigned char *aptr;
+  char *ptrname, *hostname, *rr_name, *rr_data;
+  struct hostent *hostent = NULL;
+  int aliascnt = 0;
+  int alias_alloc = 8;
+  char ** aliases;
+  size_t rr_data_len;
+
+  /* Set *host to NULL for all failure cases. */
+  *host = NULL;
+  if (hostttl)
+    *hostttl = INT_MAX;
+
+  /* Give up if abuf doesn't have room for a header. */
+  if (alen < HFIXEDSZ)
+    return ARES_EBADRESP;
+
+  /* Fetch the question and answer count from the header. */
+  qdcount = DNS_HEADER_QDCOUNT(abuf);
+  ancount = DNS_HEADER_ANCOUNT(abuf);
+  if (qdcount != 1)
+    return ARES_EBADRESP;
+
+  /* Expand the name from the question, and skip past the question. */
+  aptr = abuf + HFIXEDSZ;
+  status = ares__expand_name_for_response(aptr, abuf, alen, &ptrname, &len, 0);
+  if (status != ARES_SUCCESS)
+    return status;
+  if (aptr + len + QFIXEDSZ > abuf + alen)
+    {
+      ares_free(ptrname);
+      return ARES_EBADRESP;
+    }
+  aptr += len + QFIXEDSZ;
+
+  /* Examine each answer resource record (RR) in turn. */
+  hostname = NULL;
+  aliases = ares_malloc(alias_alloc * sizeof(char *));
+  if (!aliases)
+    {
+      ares_free(ptrname);
+      return ARES_ENOMEM;
+    }
+  for (i = 0; i < (int)ancount; i++)
+    {
+      /* Decode the RR up to the data field. */
+      status = ares__expand_name_for_response(aptr, abuf, alen, &rr_name, &len, 0);
+      if (status != ARES_SUCCESS)
+        break;
+      aptr += len;
+      if (aptr + RRFIXEDSZ > abuf + alen)
+        {
+          ares_free(rr_name);
+          status = ARES_EBADRESP;
+          break;
+        }
+      rr_type = DNS_RR_TYPE(aptr);
+      rr_class = DNS_RR_CLASS(aptr);
+      rr_len = DNS_RR_LEN(aptr);
+      rr_ttl = DNS_RR_TTL(aptr);
+      aptr += RRFIXEDSZ;
+      if (aptr + rr_len > abuf + alen)
+        {
+          ares_free(rr_name);
+          status = ARES_EBADRESP;
+          break;
+        }
+
+      if (rr_class == C_IN && rr_type == T_PTR
+          && strcasecmp(rr_name, ptrname) == 0)
+        {
+          /* Decode the RR data and set hostname to it. */
+          status = ares__expand_name_for_response(aptr, abuf, alen, &rr_data,
+                                                  &len, 1);
+          if (status != ARES_SUCCESS)
+            {
+              ares_free(rr_name);
+              break;
+            }
+          if (hostname)
+            ares_free(hostname);
+          hostname = rr_data;
+          rr_data_len = strlen(rr_data)+1;
+          aliases[aliascnt] = ares_malloc(rr_data_len * sizeof(char));
+          if (!aliases[aliascnt])
+            {
+              ares_free(rr_name);
+              status = ARES_ENOMEM;
+              break;
+            }
+          strncpy(aliases[aliascnt], rr_data, rr_data_len);
+          aliascnt++;
+          if (aliascnt >= alias_alloc) {
+            char **ptr;
+            alias_alloc *= 2;
+            ptr = ares_realloc(aliases, alias_alloc * sizeof(char *));
+            if(!ptr) {
+              ares_free(rr_name);
+              status = ARES_ENOMEM;
+              break;
+            }
+            aliases = ptr;
+          }
+          if (hostttl)
+          {
+            if (*hostttl > rr_ttl)
+            {
+              *hostttl = rr_ttl;
+            }
+          }
+        }
+
+      if (rr_class == C_IN && rr_type == T_CNAME)
+        {
+          /* Decode the RR data and replace ptrname with it. */
+          status = ares__expand_name_for_response(aptr, abuf, alen, &rr_data,
+                                                  &len, 1);
+          if (status != ARES_SUCCESS)
+            {
+              ares_free(rr_name);
+              break;
+            }
+          ares_free(ptrname);
+          ptrname = rr_data;
+        }
+
+      ares_free(rr_name);
+      aptr += rr_len;
+      if (aptr > abuf + alen)
+        {  /* LCOV_EXCL_START: already checked above */
+          status = ARES_EBADRESP;
+          break;
+        }  /* LCOV_EXCL_STOP */
+    }
+
+  if (status == ARES_SUCCESS && !hostname)
+    status = ARES_ENODATA;
+  if (status == ARES_SUCCESS)
+    {
+      /* If we don't reach the end, we must have failed due to out of memory */
+      status = ARES_ENOMEM;
+
+      /* We got our answer.  Allocate memory to build the host entry. */
+      hostent = ares_malloc(sizeof(*hostent));
+      if (!hostent)
+        goto fail;
+
+      /* If we don't memset here, cleanups may fail */
+      memset(hostent, 0, sizeof(*hostent));
+
+      hostent->h_addr_list = ares_malloc(2 * sizeof(char *));
+      if (!hostent->h_addr_list)
+        goto fail;
+
+
+      if (addr && addrlen) {
+        hostent->h_addr_list[0] = ares_malloc(addrlen);
+        if (!hostent->h_addr_list[0])
+          goto fail;
+      } else {
+        hostent->h_addr_list[0] = NULL;
+      }
+
+      hostent->h_aliases = ares_malloc((aliascnt+1) * sizeof (char *));
+      if (!hostent->h_aliases)
+        goto fail;
+
+      /* Fill in the hostent and return successfully. */
+      hostent->h_name = hostname;
+      for (i=0 ; i<aliascnt ; i++)
+        hostent->h_aliases[i] = aliases[i];
+      hostent->h_aliases[aliascnt] = NULL;
+      hostent->h_addrtype = aresx_sitoss(family);
+      hostent->h_length = aresx_sitoss(addrlen);
+      if (addr && addrlen)
+        memcpy(hostent->h_addr_list[0], addr, addrlen);
+      hostent->h_addr_list[1] = NULL;
+      *host = hostent;
+      ares_free(aliases);
+      ares_free(ptrname);
+
+      return ARES_SUCCESS;
+    }
+
+fail:
+  ares_free_hostent(hostent);
+
+  for (i=0 ; i<aliascnt ; i++)
+    if (aliases[i])
+      ares_free(aliases[i]);
+  ares_free(aliases);
+  if (hostname)
+    ares_free(hostname);
+  ares_free(ptrname);
+  return status;
+}