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| 关键词： findip include program hostname argv License printf software General Public |
/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * * Filename: findip.c * Created : Nov. 10th 1995 @ 4:30pm * Author : SrfRoG ([email protected]) * Descrip.: This cute little program will attempt to resolve * an IP address to its hostname. Then prints the results * to standard output. * --------------------------------------------------------------------- * To compile this program: * Linux: gcc -O2 -m486 -s -o findip findip.c * AIX, BSD: gcc -O2 -s -o findip findip.c * SunOS: gcc -O2 -lnsl -s -o findip findip.c * Other: cc -o findip findip.c */ #include #include #include #include #include #include int main(argc, argv) int argc; char **argv; { struct hostent *ip; unsigned long hostname; if (argc != 2) { printf("Need to specify an IP address.\n"); exit(1); } if ((hostname = inet_addr(argv[1])) == -1) { printf("Could not find %s\n", argv[1]); exit(1); } if ((ip = gethostbyaddr((char *)&hostname, sizeof(long), AF_INET)) != NULL) printf("%s is %s\n", argv[1], ip->h_name); else printf("Could not resolve %s\n", argv[1]); return 0; } |
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