82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
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/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define _GNU_SOURCE 1
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <netdb.h>
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int main( int argc, char** argv )
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{
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char* hostname = "localhost";
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struct hostent* hent;
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int i, ret;
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if (argc > 1)
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hostname = argv[1];
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hent = gethostbyname(hostname);
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if (hent == NULL) {
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printf("gethostbyname(%s) returned NULL !!\n", hostname);
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return 1;
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}
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printf( "gethostbyname(%s) returned:\n", hostname);
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printf( " name: %s\n", hent->h_name );
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printf( " aliases:" );
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for (i = 0; hent->h_aliases[i] != NULL; i++)
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printf( " %s", hent->h_aliases[i] );
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printf( "\n" );
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printf( " address type: " );
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switch (hent->h_addrtype) {
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case AF_INET: printf( "AF_INET\n"); break;
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case AF_INET6: printf( "AF_INET6\n"); break;
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default: printf("UNKNOWN (%d)\n", hent->h_addrtype);
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}
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printf( " address: " );
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switch (hent->h_addrtype) {
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case AF_INET:
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{
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const char* dot = "";
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for (i = 0; i < hent->h_length; i++) {
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printf("%s%d", dot, ((unsigned char*)hent->h_addr)[i]);
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dot = ".";
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}
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}
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break;
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default:
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for (i = 0; i < hent->h_length; i++) {
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printf( "%02x", ((unsigned char*)hent->h_addr)[i] );
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}
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}
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printf("\n");
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return 0;
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}
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