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addr2name.c
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addr2name.c
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/******************************************************************************/
/* */
/* $Header: server.c,v 1.23 93/03/30 16:19:12 tine Exp $ */
/* */
/******************************************************************************/
# include <stdio.h>
# include <stdlib.h> /* fuer 'malloc()', 'exit()' */
# include <string.h> /* fuer 'strlen()', 'memset()' */
# include <sys/socket.h>
# include <netinet/in.h>
#include <netdb.h>
# include <arpa/inet.h>
# include <unistd.h> /* fuer 'getpid()', 'fork()' */
# include <sys/msg.h> /* fuer 'msgrcv()', msgsnd()' */
# include <fcntl.h>
# include <sys/types.h>
# include <sys/stat.h>
//# include <sys/mknod.h>
# include <sys/ipc.h>
#include <sys/param.h>
#include <sys/types.h>
char gui_host_file[80];
FILE *gui_host;
char *default_conf_dir = "/usr/local/tcl/conf";
char *default_host_name = "hosts";
char *default_host_addr = "0.0.0.0";
char *progname = "addr_serv";
#define LINE_LEN 256
char line[LINE_LEN];
char program_name[80];
main (argc, argv)
int argc;
char *argv[];
{
char *tmp;
char host_name[80];
char h_name[80];
char *host_addr;
char *namep;
struct hostent *host_entry;
struct in_addr my_inet_addr;
int i, j, len;
if ( argc <= 1)
{
fprintf (stderr, "unknown\n");
exit (1);
}
host_addr = argv[1];
i = inet_aton( host_addr, &my_inet_addr);
host_entry = gethostbyaddr((char *)&(my_inet_addr.s_addr), sizeof(my_inet_addr.s_addr), AF_INET );
if (host_entry == NULL)
{
fprintf (stderr, "unknown\n");
exit (1);
}
len = strlen (host_entry->h_name);
for (namep = host_entry->h_name, i = 0; (i < len) && (*namep != '.'); i++, namep++)
host_name[i] = *namep;
host_name[i] = '\0';
printf("%s\n", host_name);
exit(0);
}