46 lines
1 KiB
C
46 lines
1 KiB
C
/*
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* gethostbyaddr tester. compile with:
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*
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* cc -o gethostbyaddr gethostbyaddr.c (SunOS 4.x)
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*
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* cc -o gethostbyaddr gethostbyaddr.c -lnsl (SunOS 5.x)
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*
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* run as: gethostbyaddr address
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*
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* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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main(argc, argv)
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int argc;
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char **argv;
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{
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struct hostent *hp;
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long addr;
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if (argc != 2) {
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fprintf(stderr, "usage: %s i.p.address\n", argv[0]);
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exit(1);
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}
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addr = inet_addr(argv[1]);
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if (hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET)) {
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printf("Hostname:\t%s\n", hp->h_name);
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printf("Aliases:\t");
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while (hp->h_aliases[0])
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printf("%s ", *hp->h_aliases++);
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printf("\n");
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printf("Addresses:\t");
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while (hp->h_addr_list[0])
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printf("%s ", inet_ntoa(*(struct in_addr *) * hp->h_addr_list++));
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printf("\n");
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exit(0);
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}
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fprintf(stderr, "host %s not found\n", argv[1]);
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exit(1);
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}
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