mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-24 20:29:55 +00:00
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/*
|
|
* $Id: hostname.c,v 1.5 1999/12/09 06:11:36 andersen Exp $
|
|
* Mini hostname implementation for busybox
|
|
*
|
|
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
|
|
*
|
|
* adjusted by Erik Andersen <andersee@debian.org> to remove
|
|
* use of long options and GNU getopt. Improved the usage info.
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "internal.h"
|
|
#include <errno.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
|
|
static const char* hostname_usage =
|
|
"hostname [OPTION] {hostname | -F file}\n\n"
|
|
"Get or set the hostname or DNS domain name. If a hostname is given\n"
|
|
"(or a file with the -F parameter), the host name will be set.\n\n"
|
|
"Options:\n"
|
|
"\t-s\t\tShort\n"
|
|
"\t-i\t\tAddresses for the hostname\n"
|
|
"\t-d\t\tDNS domain name\n"
|
|
"\t-F FILE\t\tUse the contents of FILE to specify the hostname\n";
|
|
|
|
|
|
void do_sethostname(char *s, int isfile)
|
|
{
|
|
FILE *f;
|
|
char buf[255];
|
|
|
|
if (!s) return;
|
|
if (!isfile) {
|
|
if (sethostname(s, strlen(s)) < 0) {
|
|
if (errno == EPERM)
|
|
fprintf(stderr, "hostname: you must be root to change the hostname\n");
|
|
else
|
|
perror("sethostname");
|
|
exit(1);
|
|
}
|
|
} else {
|
|
if ((f = fopen(s, "r")) == NULL) {
|
|
perror(s);
|
|
exit(1);
|
|
} else {
|
|
fgets(buf, 255, f);
|
|
fclose(f);
|
|
if (buf[strlen(buf)-1] == '\n') buf[strlen(buf)-1] = 0;
|
|
if (sethostname(buf, strlen(buf)) < 0) {
|
|
perror("sethostname");
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int hostname_main(int argc, char **argv)
|
|
{
|
|
int opt_short = 0;
|
|
int opt_domain = 0;
|
|
int opt_ip = 0;
|
|
struct hostent *h;
|
|
char *filename = NULL;
|
|
char buf[255];
|
|
char *s = NULL;
|
|
|
|
if (argc < 1) usage(hostname_usage);
|
|
|
|
while (--argc > 0 && **(++argv) == '-') {
|
|
while (*(++(*argv))) {
|
|
switch (**argv) {
|
|
case 's':
|
|
opt_short = 1;
|
|
break;
|
|
case 'i':
|
|
opt_ip = 1;
|
|
break;
|
|
case 'd':
|
|
opt_domain = 1;
|
|
break;
|
|
case 'F':
|
|
filename = optarg;
|
|
if (--argc == 0) {
|
|
usage(hostname_usage);
|
|
}
|
|
filename = *(++argv);
|
|
break;
|
|
default:
|
|
usage(hostname_usage);
|
|
}
|
|
if (filename!=NULL)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (argc >= 1) {
|
|
do_sethostname(*argv, 0);
|
|
} else if (filename!=NULL) {
|
|
do_sethostname(filename, 1);
|
|
} else {
|
|
gethostname(buf, 255);
|
|
if (opt_short) {
|
|
s = strchr(buf, '.');
|
|
if (!s) s = buf; *s = 0;
|
|
printf("%s\n", buf);
|
|
} else if (opt_domain) {
|
|
s = strchr(buf, '.');
|
|
printf("%s\n", (s ? s+1 : ""));
|
|
} else if (opt_ip) {
|
|
h = gethostbyname(buf);
|
|
if (!h) {
|
|
printf("Host not found\n");
|
|
exit(1);
|
|
}
|
|
printf("%s\n", inet_ntoa(*(struct in_addr *)(h->h_addr)));
|
|
} else {
|
|
printf("%s\n", buf);
|
|
}
|
|
}
|
|
exit( 0);
|
|
}
|
|
|