1 files changed, 264 insertions, 0 deletions
diff --git a/src/third_party/cares/dist/src/lib/ares__readaddrinfo.c b/src/third_party/cares/dist/src/lib/ares__readaddrinfo.c
new file mode 100644
index 00000000000..2b5bb40c3dd
--- /dev/null
+++ b/src/third_party/cares/dist/src/lib/ares__readaddrinfo.c
@@ -0,0 +1,264 @@
+/* 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
+
+#include "ares.h"
+#include "ares_inet_net_pton.h"
+#include "ares_nowarn.h"
+#include "ares_private.h"
+
+#define MAX_ALIASES 40
+
+int ares__readaddrinfo(FILE *fp,
+                       const char *name,
+                       unsigned short port,
+                       const struct ares_addrinfo_hints *hints,
+                       struct ares_addrinfo *ai)
+{
+  char *line = NULL, *p, *q;
+  char *txtaddr, *txthost, *txtalias;
+  char *aliases[MAX_ALIASES];
+  unsigned int i, alias_count;
+  int status;
+  size_t linesize;
+  ares_sockaddr addr;
+  struct ares_addrinfo_cname *cname = NULL, *cnames = NULL;
+  struct ares_addrinfo_node *node = NULL, *nodes = NULL;
+  int match_with_alias, match_with_canonical;
+  int want_cname = hints->ai_flags & ARES_AI_CANONNAME;
+
+  /* Validate family */
+  switch (hints->ai_family) {
+    case AF_INET:
+    case AF_INET6:
+    case AF_UNSPEC:
+      break;
+    default:
+      return ARES_EBADFAMILY;
+  }
+
+
+  while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS)
+    {
+      match_with_alias = 0;
+      match_with_canonical = 0;
+      alias_count = 0;
+      /* Trim line comment. */
+      p = line;
+      while (*p && (*p != '#'))
+        p++;
+      *p = '\0';
+
+      /* Trim trailing whitespace. */
+      q = p - 1;
+      while ((q >= line) && ISSPACE(*q))
+        q--;
+      *++q = '\0';
+
+      /* Skip leading whitespace. */
+      p = line;
+      while (*p && ISSPACE(*p))
+        p++;
+      if (!*p)
+        /* Ignore line if empty. */
+        continue;
+
+      /* Pointer to start of IPv4 or IPv6 address part. */
+      txtaddr = p;
+
+      /* Advance past address part. */
+      while (*p && !ISSPACE(*p))
+        p++;
+      if (!*p)
+        /* Ignore line if reached end of line. */
+        continue;
+
+      /* Null terminate address part. */
+      *p = '\0';
+
+      /* Advance to host name */
+      p++;
+      while (*p && ISSPACE(*p))
+        p++;
+      if (!*p)
+        /* Ignore line if reached end of line. */
+        continue;  /* LCOV_EXCL_LINE: trailing whitespace already stripped */
+
+      /* Pointer to start of host name. */
+      txthost = p;
+
+      /* Advance past host name. */
+      while (*p && !ISSPACE(*p))
+        p++;
+
+      /* Pointer to start of first alias. */
+      txtalias = NULL;
+      if (*p)
+        {
+          q = p + 1;
+          while (*q && ISSPACE(*q))
+            q++;
+          if (*q)
+            txtalias = q;
+        }
+
+      /* Null terminate host name. */
+      *p = '\0';
+
+      /* Find out if host name matches with canonical host name. */
+      if (strcasecmp(txthost, name) == 0)
+        {
+          match_with_canonical = 1;
+        }
+
+      /* Find out if host name matches with one of the aliases. */
+      while (txtalias)
+        {
+          p = txtalias;
+          while (*p && !ISSPACE(*p))
+            p++;
+          q = p;
+          while (*q && ISSPACE(*q))
+            q++;
+          *p = '\0';
+          if (strcasecmp(txtalias, name) == 0)
+            {
+              match_with_alias = 1;
+              if (!want_cname)
+                break;
+            }
+          if (alias_count < MAX_ALIASES)
+            {
+              aliases[alias_count++] = txtalias;
+            }
+          txtalias = *q ? q : NULL;
+        }
+
+      /* Try next line if host does not match. */
+      if (!match_with_alias && !match_with_canonical)
+        {
+          continue;
+        }
+
+      /* Zero-out 'addr' struct, as there are members that we may not set, especially
+       * for ipv6.  We don't want garbage data */
+      memset(&addr, 0, sizeof(addr));
+
+      /*
+       * Convert address string to network address for the requested families.
+       * Actual address family possible values are AF_INET and AF_INET6 only.
+       */
+      if ((hints->ai_family == AF_INET) || (hints->ai_family == AF_UNSPEC))
+        {
+          addr.sa4.sin_port = htons(port);
+          if (ares_inet_pton(AF_INET, txtaddr, &addr.sa4.sin_addr) > 0)
+            {
+              node = ares__append_addrinfo_node(&nodes);
+              if(!node)
+                {
+                  goto enomem;
+                }
+
+              node->ai_family = addr.sa.sa_family = AF_INET;
+              node->ai_addrlen = sizeof(addr.sa4);
+              node->ai_addr = ares_malloc(sizeof(addr.sa4));
+              if (!node->ai_addr)
+                {
+                  goto enomem;
+                }
+              memcpy(node->ai_addr, &addr.sa4, sizeof(addr.sa4));
+            }
+        }
+      if ((hints->ai_family == AF_INET6) || (hints->ai_family == AF_UNSPEC))
+        {
+          addr.sa6.sin6_port = htons(port);
+          if (ares_inet_pton(AF_INET6, txtaddr, &addr.sa6.sin6_addr) > 0)
+            {
+              node = ares__append_addrinfo_node(&nodes);
+              if (!node)
+                {
+                  goto enomem;
+                }
+
+              node->ai_family = addr.sa.sa_family = AF_INET6;
+              node->ai_addrlen = sizeof(addr.sa6);
+              node->ai_addr = ares_malloc(sizeof(addr.sa6));
+              if (!node->ai_addr)
+                {
+                  goto enomem;
+                }
+              memcpy(node->ai_addr, &addr.sa6, sizeof(addr.sa6));
+            }
+        }
+      if (!node)
+        /* Ignore line if invalid address string for the requested family. */
+        continue;
+
+      if (want_cname)
+        {
+          for (i = 0; i < alias_count; ++i)
+            {
+              cname = ares__append_addrinfo_cname(&cnames);
+              if (!cname)
+                {
+                  goto enomem;
+                }
+              cname->alias = ares_strdup(aliases[i]);
+              cname->name = ares_strdup(txthost);
+            }
+          /* No aliases, cname only. */
+          if(!alias_count)
+            {
+              cname = ares__append_addrinfo_cname(&cnames);
+              if (!cname)
+                {
+                  goto enomem;
+                }
+              cname->name = ares_strdup(txthost);
+            }
+        }
+    }
+
+  /* Last read failed. */
+  if (status == ARES_ENOMEM)
+    {
+      goto enomem;
+    }
+
+  /* Free line buffer. */
+  ares_free(line);
+
+  ares__addrinfo_cat_cnames(&ai->cnames, cnames);
+  ares__addrinfo_cat_nodes(&ai->nodes, nodes);
+
+  return node ? ARES_SUCCESS : ARES_ENOTFOUND;
+
+enomem:
+  ares_free(line);
+  ares__freeaddrinfo_cnames(cnames);
+  ares__freeaddrinfo_nodes(nodes);
+  return ARES_ENOMEM;
+}