Adding upstream version 18.2.2.upstream/18.2.2

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

1 files changed, 261 insertions, 0 deletions

diff --git a/src/c-ares/ares__get_hostent.c b/src/c-ares/ares__get_hostent.c
new file mode 100644
index 000000000..d2f950349
--- /dev/null
+++ b/src/c-ares/ares__get_hostent.c
@@ -0,0 +1,261 @@
+
+/* Copyright 1998, 2011 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_INET_H
+#  include <arpa/inet.h>
+#endif
+
+#include "ares.h"
+#include "ares_inet_net_pton.h"
+#include "ares_nowarn.h"
+#include "ares_private.h"
+
+int ares__get_hostent(FILE *fp, int family, struct hostent **host)
+{
+  char *line = NULL, *p, *q, **alias;
+  char *txtaddr, *txthost, *txtalias;
+  int status;
+  size_t addrlen, linesize, naliases;
+  struct ares_addr addr;
+  struct hostent *hostent = NULL;
+
+  *host = NULL; /* Assume failure */
+
+  /* Validate family */
+  switch (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)
+    {
+
+      /* 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 number of aliases. */
+      naliases = 0;
+      if (txtalias)
+        {
+          p = txtalias;
+          while (*p)
+            {
+              while (*p && !ISSPACE(*p))
+                p++;
+              while (*p && ISSPACE(*p))
+                p++;
+              naliases++;
+            }
+        }
+
+      /* Convert address string to network address for the requested family. */
+      addrlen = 0;
+      addr.family = AF_UNSPEC;
+      addr.addrV4.s_addr = INADDR_NONE;
+      if ((family == AF_INET) || (family == AF_UNSPEC))
+        {
+          addr.addrV4.s_addr = inet_addr(txtaddr);
+          if (addr.addrV4.s_addr != INADDR_NONE)
+            {
+              /* Actual network address family and length. */
+              addr.family = AF_INET;
+              addrlen = sizeof(addr.addrV4);
+            }
+        }
+      if ((family == AF_INET6) || ((family == AF_UNSPEC) && (!addrlen)))
+        {
+          if (ares_inet_pton(AF_INET6, txtaddr, &addr.addrV6) > 0)
+            {
+              /* Actual network address family and length. */
+              addr.family = AF_INET6;
+              addrlen = sizeof(addr.addrV6);
+            }
+        }
+      if (!addrlen)
+        /* Ignore line if invalid address string for the requested family. */
+        continue;
+
+      /*
+      ** Actual address family possible values are AF_INET and AF_INET6 only.
+      */
+
+      /* Allocate memory for the hostent structure. */
+      hostent = ares_malloc(sizeof(struct hostent));
+      if (!hostent)
+        break;
+
+      /* Initialize fields for out of memory condition. */
+      hostent->h_aliases = NULL;
+      hostent->h_addr_list = NULL;
+
+      /* Copy official host name. */
+      hostent->h_name = ares_strdup(txthost);
+      if (!hostent->h_name)
+        break;
+
+      /* Copy network address. */
+      hostent->h_addr_list = ares_malloc(2 * sizeof(char *));
+      if (!hostent->h_addr_list)
+        break;
+      hostent->h_addr_list[1] = NULL;
+      hostent->h_addr_list[0] = ares_malloc(addrlen);
+      if (!hostent->h_addr_list[0])
+        break;
+      if (addr.family == AF_INET)
+        memcpy(hostent->h_addr_list[0], &addr.addrV4, sizeof(addr.addrV4));
+      else
+        memcpy(hostent->h_addr_list[0], &addr.addrV6, sizeof(addr.addrV6));
+
+      /* Copy aliases. */
+      hostent->h_aliases = ares_malloc((naliases + 1) * sizeof(char *));
+      if (!hostent->h_aliases)
+        break;
+      alias = hostent->h_aliases;
+      while (naliases)
+        *(alias + naliases--) = NULL;
+      *alias = NULL;
+      while (txtalias)
+        {
+          p = txtalias;
+          while (*p && !ISSPACE(*p))
+            p++;
+          q = p;
+          while (*q && ISSPACE(*q))
+            q++;
+          *p = '\0';
+          if ((*alias = ares_strdup(txtalias)) == NULL)
+            break;
+          alias++;
+          txtalias = *q ? q : NULL;
+        }
+      if (txtalias)
+        /* Alias memory allocation failure. */
+        break;
+
+      /* Copy actual network address family and length. */
+      hostent->h_addrtype = aresx_sitoss(addr.family);
+      hostent->h_length = aresx_uztoss(addrlen);
+
+      /* Free line buffer. */
+      ares_free(line);
+
+      /* Return hostent successfully */
+      *host = hostent;
+      return ARES_SUCCESS;
+
+    }
+
+  /* If allocated, free line buffer. */
+  if (line)
+    ares_free(line);
+
+  if (status == ARES_SUCCESS)
+    {
+      /* Memory allocation failure; clean up. */
+      if (hostent)
+        {
+          if (hostent->h_name)
+            ares_free((char *) hostent->h_name);
+          if (hostent->h_aliases)
+            {
+              for (alias = hostent->h_aliases; *alias; alias++)
+                ares_free(*alias);
+              ares_free(hostent->h_aliases);
+            }
+          if (hostent->h_addr_list)
+            {
+              if (hostent->h_addr_list[0])
+                ares_free(hostent->h_addr_list[0]);
+              ares_free(hostent->h_addr_list);
+            }
+          ares_free(hostent);
+        }
+      return ARES_ENOMEM;
+    }
+
+  return status;
+}