Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 219 insertions, 0 deletions

diff --git a/src/c-ares/ares_parse_ptr_reply.c b/src/c-ares/ares_parse_ptr_reply.c
new file mode 100644
index 000000000..976a5311a
--- /dev/null
+++ b/src/c-ares/ares_parse_ptr_reply.c
@@ -0,0 +1,219 @@
+
+/* 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
+#ifdef HAVE_ARPA_NAMESER_H
+#  include <arpa/nameser.h>
+#else
+#  include "nameser.h"
+#endif
+#ifdef HAVE_ARPA_NAMESER_COMPAT_H
+#  include <arpa/nameser_compat.h>
+#endif
+
+#ifdef HAVE_STRINGS_H
+#  include <strings.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)
+{
+  unsigned int qdcount, ancount;
+  int status, i, rr_type, rr_class, rr_len;
+  long len;
+  const unsigned char *aptr;
+  char *ptrname, *hostname, *rr_name, *rr_data;
+  struct hostent *hostent;
+  int aliascnt = 0;
+  int alias_alloc = 8;
+  char ** aliases;
+
+  /* Set *host to NULL for all failure cases. */
+  *host = NULL;
+
+  /* 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);
+  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);
+      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);
+      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);
+          if (status != ARES_SUCCESS)
+            {
+              ares_free(rr_name);
+              break;
+            }
+          if (hostname)
+            ares_free(hostname);
+          hostname = rr_data;
+          aliases[aliascnt] = ares_malloc((strlen(rr_data)+1) * sizeof(char));
+          if (!aliases[aliascnt])
+            {
+              ares_free(rr_name);
+              status = ARES_ENOMEM;
+              break;
+            }
+          strncpy(aliases[aliascnt], rr_data, strlen(rr_data)+1);
+          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 (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);
+          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)
+    {
+      /* We got our answer.  Allocate memory to build the host entry. */
+      hostent = ares_malloc(sizeof(struct hostent));
+      if (hostent)
+        {
+          hostent->h_addr_list = ares_malloc(2 * sizeof(char *));
+          if (hostent->h_addr_list)
+            {
+              hostent->h_addr_list[0] = ares_malloc(addrlen);
+              if (hostent->h_addr_list[0])
+                {
+                  hostent->h_aliases = ares_malloc((aliascnt+1) * sizeof (char *));
+                  if (hostent->h_aliases)
+                    {
+                      /* 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);
+                      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;
+                    }
+                  ares_free(hostent->h_addr_list[0]);
+                }
+              ares_free(hostent->h_addr_list);
+            }
+          ares_free(hostent);
+        }
+      status = ARES_ENOMEM;
+    }
+  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;
+}