1 files changed, 122 insertions, 0 deletions
diff --git a/ahost.c b/ahost.c
new file mode 100644
index 0000000..294c0e9
--- /dev/null
+++ b/ahost.c
@@ -0,0 +1,122 @@
+/* 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.
+ */
+
+static const char rcsid[] = "$Id$";
+
+#include <sys/types.h>
+
+#ifdef WIN32
+#else
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "ares.h"
+#include "ares_dns.h"
+
+#ifndef INADDR_NONE
+#define	INADDR_NONE 0xffffffff
+#endif
+
+static void callback(void *arg, int status, struct hostent *host);
+static void usage(void);
+
+int main(int argc, char **argv)
+{
+  ares_channel channel;
+  int status, nfds;
+  fd_set read_fds, write_fds;
+  struct timeval *tvp, tv;
+  char *errmem;
+  struct in_addr addr;
+
+#ifdef WIN32
+  WORD wVersionRequested = MAKEWORD(1,1);
+  WSADATA wsaData;
+  WSAStartup(wVersionRequested, &wsaData);
+#endif  
+
+  if (argc == 0)
+    usage();
+
+  status = ares_init(&channel);
+  if (status != ARES_SUCCESS)
+    {
+      fprintf(stderr, "ares_init: %s\n", ares_strerror(status, &errmem));
+      ares_free_errmem(errmem);
+      return 1;
+    }
+
+  /* Initiate the queries, one per command-line argument. */
+  for (argv++; *argv; argv++)
+    {
+      addr.s_addr = inet_addr(*argv);
+      if (addr.s_addr == INADDR_NONE)
+	ares_gethostbyname(channel, *argv, AF_INET, callback, *argv);
+      else
+	{
+	  ares_gethostbyaddr(channel, &addr, sizeof(addr), AF_INET, callback,
+			     *argv);
+	}
+    }
+
+  /* Wait for all queries to complete. */
+  while (1)
+    {
+      FD_ZERO(&read_fds);
+      FD_ZERO(&write_fds);
+      nfds = ares_fds(channel, &read_fds, &write_fds);
+      if (nfds == 0)
+	break;
+      tvp = ares_timeout(channel, NULL, &tv);
+      select(nfds, &read_fds, &write_fds, NULL, tvp);
+      ares_process(channel, &read_fds, &write_fds);
+    }
+
+  ares_destroy(channel);
+  return 0;
+}
+
+static void callback(void *arg, int status, struct hostent *host)
+{
+  struct in_addr addr;
+  char *mem, **p;
+
+  if (status != ARES_SUCCESS)
+    {
+      fprintf(stderr, "%s: %s\n", (char *) arg, ares_strerror(status, &mem));
+      ares_free_errmem(mem);
+      return;
+    }
+
+  for (p = host->h_addr_list; *p; p++)
+    {
+      memcpy(&addr, *p, sizeof(struct in_addr));
+      printf("%-32s\t%s\n", host->h_name, inet_ntoa(addr));
+    }
+}
+
+static void usage(void)
+{
+  fprintf(stderr, "usage: ahost {host|addr} ...\n");
+  exit(1);
+}