aboutsummaryrefslogtreecommitdiff
path: root/hostname.c
diff options
context:
space:
mode:
Diffstat (limited to 'hostname.c')
-rw-r--r--hostname.c193
1 files changed, 100 insertions, 93 deletions
diff --git a/hostname.c b/hostname.c
index 68a560950..8cc334da0 100644
--- a/hostname.c
+++ b/hostname.c
@@ -1,5 +1,6 @@
1/* vi: set sw=4 ts=4: */
1/* 2/*
2 * $Id: hostname.c,v 1.6 2000/02/07 05:29:42 erik Exp $ 3 * $Id: hostname.c,v 1.7 2000/02/08 19:58:47 erik Exp $
3 * Mini hostname implementation for busybox 4 * Mini hostname implementation for busybox
4 * 5 *
5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org> 6 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
@@ -29,110 +30,116 @@
29#include <unistd.h> 30#include <unistd.h>
30#include <stdio.h> 31#include <stdio.h>
31 32
32static const char* hostname_usage = 33static const char *hostname_usage =
33"hostname [OPTION] {hostname | -F file}\n\n" 34 "hostname [OPTION] {hostname | -F file}\n\n"
34"Get or set the hostname or DNS domain name. If a hostname is given\n" 35 "Get or set the hostname or DNS domain name. If a hostname is given\n"
35"(or a file with the -F parameter), the host name will be set.\n\n" 36 "(or a file with the -F parameter), the host name will be set.\n\n"
36"Options:\n" 37 "Options:\n"
37"\t-s\t\tShort\n" 38 "\t-s\t\tShort\n"
38"\t-i\t\tAddresses for the hostname\n" 39
39"\t-d\t\tDNS domain name\n" 40 "\t-i\t\tAddresses for the hostname\n"
40"\t-F FILE\t\tUse the contents of FILE to specify the hostname\n"; 41 "\t-d\t\tDNS domain name\n"
42 "\t-F FILE\t\tUse the contents of FILE to specify the hostname\n";
41 43
42 44
43void do_sethostname(char *s, int isfile) 45void do_sethostname(char *s, int isfile)
44{ 46{
45 FILE *f; 47 FILE *f;
46 char buf[255]; 48 char buf[255];
47 49
48 if (!s) return; 50 if (!s)
49 if (!isfile) { 51 return;
50 if (sethostname(s, strlen(s)) < 0) { 52 if (!isfile) {
51 if (errno == EPERM) 53 if (sethostname(s, strlen(s)) < 0) {
52 fprintf(stderr, "hostname: you must be root to change the hostname\n"); 54 if (errno == EPERM)
53 else 55 fprintf(stderr,
54 perror("sethostname"); 56 "hostname: you must be root to change the hostname\n");
55 exit(1); 57 else
56 } 58 perror("sethostname");
57 } else { 59 exit(1);
58 if ((f = fopen(s, "r")) == NULL) { 60 }
59 perror(s);
60 exit(1);
61 } else { 61 } else {
62 fgets(buf, 255, f); 62 if ((f = fopen(s, "r")) == NULL) {
63 fclose(f); 63 perror(s);
64 if (buf[strlen(buf)-1] == '\n') buf[strlen(buf)-1] = 0; 64 exit(1);
65 if (sethostname(buf, strlen(buf)) < 0) { 65 } else {
66 perror("sethostname"); 66 fgets(buf, 255, f);
67 exit(1); 67 fclose(f);
68 } 68 if (buf[strlen(buf) - 1] == '\n')
69 buf[strlen(buf) - 1] = 0;
70 if (sethostname(buf, strlen(buf)) < 0) {
71 perror("sethostname");
72 exit(1);
73 }
74 }
69 } 75 }
70 }
71} 76}
72 77
73int hostname_main(int argc, char **argv) 78int hostname_main(int argc, char **argv)
74{ 79{
75 int opt_short = 0; 80 int opt_short = 0;
76 int opt_domain = 0; 81 int opt_domain = 0;
77 int opt_ip = 0; 82 int opt_ip = 0;
78 struct hostent *h; 83 struct hostent *h;
79 char *filename = NULL; 84 char *filename = NULL;
80 char buf[255]; 85 char buf[255];
81 char *s = NULL; 86 char *s = NULL;
82
83 if (argc < 1) usage(hostname_usage);
84 87
85 while (--argc > 0 && **(++argv) == '-') { 88 if (argc < 1)
86 while (*(++(*argv))) {
87 switch (**argv) {
88 case 's':
89 opt_short = 1;
90 break;
91 case 'i':
92 opt_ip = 1;
93 break;
94 case 'd':
95 opt_domain = 1;
96 break;
97 case 'F':
98 filename = optarg;
99 if (--argc == 0) {
100 usage(hostname_usage);
101 }
102 filename = *(++argv);
103 break;
104 default:
105 usage(hostname_usage); 89 usage(hostname_usage);
106 } 90
107 if (filename!=NULL) 91 while (--argc > 0 && **(++argv) == '-') {
108 break; 92 while (*(++(*argv))) {
93 switch (**argv) {
94 case 's':
95 opt_short = 1;
96 break;
97 case 'i':
98 opt_ip = 1;
99 break;
100 case 'd':
101 opt_domain = 1;
102 break;
103 case 'F':
104 filename = optarg;
105 if (--argc == 0) {
106 usage(hostname_usage);
107 }
108 filename = *(++argv);
109 break;
110 default:
111 usage(hostname_usage);
112 }
113 if (filename != NULL)
114 break;
115 }
109 } 116 }
110 }
111 117
112 if (argc >= 1) { 118 if (argc >= 1) {
113 do_sethostname(*argv, 0); 119 do_sethostname(*argv, 0);
114 } else if (filename!=NULL) { 120 } else if (filename != NULL) {
115 do_sethostname(filename, 1); 121 do_sethostname(filename, 1);
116 } else { 122 } else {
117 gethostname(buf, 255); 123 gethostname(buf, 255);
118 if (opt_short) { 124 if (opt_short) {
119 s = strchr(buf, '.'); 125 s = strchr(buf, '.');
120 if (!s) s = buf; *s = 0; 126 if (!s)
121 printf("%s\n", buf); 127 s = buf;
122 } else if (opt_domain) { 128 *s = 0;
123 s = strchr(buf, '.'); 129 printf("%s\n", buf);
124 printf("%s\n", (s ? s+1 : "")); 130 } else if (opt_domain) {
125 } else if (opt_ip) { 131 s = strchr(buf, '.');
126 h = gethostbyname(buf); 132 printf("%s\n", (s ? s + 1 : ""));
127 if (!h) { 133 } else if (opt_ip) {
128 printf("Host not found\n"); 134 h = gethostbyname(buf);
129 exit(1); 135 if (!h) {
130 } 136 printf("Host not found\n");
131 printf("%s\n", inet_ntoa(*(struct in_addr *)(h->h_addr))); 137 exit(1);
132 } else { 138 }
133 printf("%s\n", buf); 139 printf("%s\n", inet_ntoa(*(struct in_addr *) (h->h_addr)));
134 } 140 } else {
135 } 141 printf("%s\n", buf);
136 exit( 0); 142 }
143 }
144 exit(0);
137} 145}
138
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-12 18:26:06 +0000