1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* vi: set sw=4 ts=4: */
/*
* $Id: hostname.c,v 1.21 2001/01/27 08:24:37 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 "busybox.h"
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
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)
error_msg_and_die("you must be root to change the hostname\n");
else
perror_msg_and_die("sethostname");
}
} else {
f = xfopen(s, "r");
fgets(buf, 255, f);
fclose(f);
if (buf[strlen(buf) - 1] == '\n')
buf[strlen(buf) - 1] = 0;
if (sethostname(buf, strlen(buf)) < 0)
perror_msg_and_die("sethostname");
}
}
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':
if (--argc == 0) {
usage(hostname_usage);
}
filename = *(++argv);
break;
case '-':
if (strcmp(++(*argv), "file") || --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);
}
}
return(0);
}
|
