intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 217 insertions, 0 deletions

diff --git a/contrib/libs/c-ares/ares_parse_aaaa_reply.c b/contrib/libs/c-ares/ares_parse_aaaa_reply.c
new file mode 100644
index 0000000000..0d39bfa826
--- /dev/null
+++ b/contrib/libs/c-ares/ares_parse_aaaa_reply.c
@@ -0,0 +1,217 @@
+
+/* Copyright 1998 by the Massachusetts Institute of Technology.
+ * Copyright 2005 Dominick Meglio
+ * Copyright (C) 2019 by Andrew Selivanov
+ *
+ * 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_INET_H
+#  include <arpa/inet.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
+
+#ifdef HAVE_LIMITS_H
+#  include <limits.h>
+#endif
+
+#include "ares.h"
+#include "ares_dns.h"
+#include "ares_inet_net_pton.h"
+#include "ares_private.h"
+
+int ares_parse_aaaa_reply(const unsigned char *abuf, int alen,
+                          struct hostent **host, struct ares_addr6ttl *addrttls,
+                          int *naddrttls)
+{
+  struct ares_addrinfo ai;
+  struct ares_addrinfo_node *next;
+  struct ares_addrinfo_cname *next_cname;
+  char **aliases = NULL;
+  char *question_hostname = NULL;
+  struct hostent *hostent = NULL;
+  struct ares_in6_addr *addrs = NULL;
+  int naliases = 0, naddrs = 0, alias = 0, i;
+  int cname_ttl = INT_MAX;
+  int status;
+
+  memset(&ai, 0, sizeof(ai));
+
+  status = ares__parse_into_addrinfo2(abuf, alen, &question_hostname, &ai);
+  if (status != ARES_SUCCESS)
+    {
+      ares_free(question_hostname);
+
+      if (naddrttls)
+        {
+          *naddrttls = 0;
+        }
+
+      return status;
+    }
+
+  hostent = ares_malloc(sizeof(struct hostent));
+  if (!hostent)
+    {
+      goto enomem;
+    }
+
+  next = ai.nodes;
+  while (next)
+    {
+      if(next->ai_family == AF_INET6)
+        {
+          ++naddrs;
+        }
+      next = next->ai_next;
+    }
+
+  next_cname = ai.cnames;
+  while (next_cname)
+    {
+      if(next_cname->alias)
+        ++naliases;
+      next_cname = next_cname->next;
+    }
+
+  aliases = ares_malloc((naliases + 1) * sizeof(char *));
+  if (!aliases)
+    {
+      goto enomem;
+    }
+
+  if (naliases)
+    {
+      next_cname = ai.cnames;
+      while (next_cname)
+        {
+          if(next_cname->alias)
+            aliases[alias++] = strdup(next_cname->alias);
+          if(next_cname->ttl < cname_ttl)
+            cname_ttl = next_cname->ttl;
+          next_cname = next_cname->next;
+        }
+    }
+
+  aliases[alias] = NULL;
+
+  hostent->h_addr_list = ares_malloc((naddrs + 1) * sizeof(char *));
+  if (!hostent->h_addr_list)
+    {
+      goto enomem;
+    }
+
+  for (i = 0; i < naddrs + 1; ++i)
+    {
+      hostent->h_addr_list[i] = NULL;
+    }
+
+  if (ai.cnames)
+    {
+      hostent->h_name = strdup(ai.cnames->name);
+      ares_free(question_hostname);
+    }
+  else
+    {
+      hostent->h_name = question_hostname;
+    }
+
+  hostent->h_aliases = aliases;
+  hostent->h_addrtype = AF_INET6;
+  hostent->h_length = sizeof(struct ares_in6_addr);
+
+  if (naddrs)
+    {
+      addrs = ares_malloc(naddrs * sizeof(struct ares_in6_addr));
+      if (!addrs)
+        {
+          goto enomem;
+        }
+
+      i = 0;
+      next = ai.nodes;
+      while (next)
+        {
+          if(next->ai_family == AF_INET6)
+            {
+              hostent->h_addr_list[i] = (char*)&addrs[i];
+              memcpy(hostent->h_addr_list[i],
+                     &(CARES_INADDR_CAST(struct sockaddr_in6 *, next->ai_addr)->sin6_addr),
+                     sizeof(struct ares_in6_addr));
+              if (naddrttls && i < *naddrttls)
+                {
+                    if(next->ai_ttl > cname_ttl)
+                      addrttls[i].ttl = cname_ttl;
+                    else
+                      addrttls[i].ttl = next->ai_ttl;
+
+                    memcpy(&addrttls[i].ip6addr,
+                           &(CARES_INADDR_CAST(struct sockaddr_in6 *, next->ai_addr)->sin6_addr),
+                           sizeof(struct ares_in6_addr));
+                }
+              ++i;
+            }
+          next = next->ai_next;
+        }
+
+      if (i == 0)
+        {
+          ares_free(addrs);
+        }
+    }
+
+  if (host)
+    {
+      *host = hostent;
+    }
+  else
+    {
+      ares_free_hostent(hostent);
+    }
+
+  if (naddrttls)
+    {
+      *naddrttls = naddrs;
+    }
+
+  ares__freeaddrinfo_cnames(ai.cnames);
+  ares__freeaddrinfo_nodes(ai.nodes);
+  return ARES_SUCCESS;
+
+enomem:
+  ares_free(aliases);
+  ares_free(hostent);
+  ares__freeaddrinfo_cnames(ai.cnames);
+  ares__freeaddrinfo_nodes(ai.nodes);
+  ares_free(question_hostname);
+  return ARES_ENOMEM;
+}