Some formatting updates (ran the code through indent)
-Erik
This commit is contained in:
Erik Andersen
195
hostname.c
195
hostname.c
@@ -1,5 +1,6 @@
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/* vi: set sw=4 ts=4: */
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/*
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* $Id: hostname.c,v 1.6 2000/02/07 05:29:42 erik Exp $
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* $Id: hostname.c,v 1.7 2000/02/08 19:58:47 erik Exp $
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* Mini hostname implementation for busybox
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*
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* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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@@ -29,110 +30,116 @@
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#include <unistd.h>
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#include <stdio.h>
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static const char* hostname_usage =
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"hostname [OPTION] {hostname | -F file}\n\n"
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"Get or set the hostname or DNS domain name. If a hostname is given\n"
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"(or a file with the -F parameter), the host name will be set.\n\n"
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"Options:\n"
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"\t-s\t\tShort\n"
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"\t-i\t\tAddresses for the hostname\n"
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"\t-d\t\tDNS domain name\n"
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"\t-F FILE\t\tUse the contents of FILE to specify the hostname\n";
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static const char *hostname_usage =
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"hostname [OPTION] {hostname | -F file}\n\n"
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"Get or set the hostname or DNS domain name. If a hostname is given\n"
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"(or a file with the -F parameter), the host name will be set.\n\n"
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"Options:\n"
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"\t-s\t\tShort\n"
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"\t-i\t\tAddresses for the hostname\n"
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"\t-d\t\tDNS domain name\n"
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"\t-F FILE\t\tUse the contents of FILE to specify the hostname\n";
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void do_sethostname(char *s, int isfile)
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{
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FILE *f;
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char buf[255];
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if (!s) return;
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if (!isfile) {
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if (sethostname(s, strlen(s)) < 0) {
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if (errno == EPERM)
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fprintf(stderr, "hostname: you must be root to change the hostname\n");
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else
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perror("sethostname");
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exit(1);
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}
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} else {
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if ((f = fopen(s, "r")) == NULL) {
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perror(s);
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exit(1);
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FILE *f;
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char buf[255];
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if (!s)
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return;
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if (!isfile) {
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if (sethostname(s, strlen(s)) < 0) {
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if (errno == EPERM)
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fprintf(stderr,
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"hostname: you must be root to change the hostname\n");
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else
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perror("sethostname");
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exit(1);
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}
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} else {
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fgets(buf, 255, f);
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fclose(f);
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if (buf[strlen(buf)-1] == '\n') buf[strlen(buf)-1] = 0;
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if (sethostname(buf, strlen(buf)) < 0) {
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perror("sethostname");
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exit(1);
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}
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if ((f = fopen(s, "r")) == NULL) {
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perror(s);
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exit(1);
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} else {
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fgets(buf, 255, f);
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fclose(f);
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if (buf[strlen(buf) - 1] == '\n')
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buf[strlen(buf) - 1] = 0;
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if (sethostname(buf, strlen(buf)) < 0) {
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perror("sethostname");
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exit(1);
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}
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}
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}
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}
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}
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int hostname_main(int argc, char **argv)
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{
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int opt_short = 0;
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int opt_domain = 0;
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int opt_ip = 0;
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struct hostent *h;
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char *filename = NULL;
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char buf[255];
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char *s = NULL;
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if (argc < 1) usage(hostname_usage);
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int opt_short = 0;
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int opt_domain = 0;
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int opt_ip = 0;
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struct hostent *h;
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char *filename = NULL;
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char buf[255];
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char *s = NULL;
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while (--argc > 0 && **(++argv) == '-') {
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while (*(++(*argv))) {
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switch (**argv) {
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case 's':
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opt_short = 1;
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break;
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case 'i':
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opt_ip = 1;
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break;
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case 'd':
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opt_domain = 1;
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break;
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case 'F':
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filename = optarg;
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if (--argc == 0) {
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usage(hostname_usage);
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}
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filename = *(++argv);
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break;
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default:
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if (argc < 1)
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usage(hostname_usage);
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}
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if (filename!=NULL)
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break;
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}
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}
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if (argc >= 1) {
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do_sethostname(*argv, 0);
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} else if (filename!=NULL) {
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do_sethostname(filename, 1);
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} else {
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gethostname(buf, 255);
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if (opt_short) {
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s = strchr(buf, '.');
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if (!s) s = buf; *s = 0;
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printf("%s\n", buf);
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} else if (opt_domain) {
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s = strchr(buf, '.');
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printf("%s\n", (s ? s+1 : ""));
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} else if (opt_ip) {
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h = gethostbyname(buf);
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if (!h) {
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printf("Host not found\n");
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exit(1);
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}
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printf("%s\n", inet_ntoa(*(struct in_addr *)(h->h_addr)));
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} else {
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printf("%s\n", buf);
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}
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}
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exit( 0);
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while (--argc > 0 && **(++argv) == '-') {
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while (*(++(*argv))) {
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switch (**argv) {
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case 's':
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opt_short = 1;
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break;
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case 'i':
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opt_ip = 1;
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break;
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case 'd':
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opt_domain = 1;
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break;
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case 'F':
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filename = optarg;
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if (--argc == 0) {
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usage(hostname_usage);
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}
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filename = *(++argv);
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break;
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default:
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usage(hostname_usage);
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}
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if (filename != NULL)
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break;
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}
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}
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if (argc >= 1) {
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do_sethostname(*argv, 0);
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} else if (filename != NULL) {
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do_sethostname(filename, 1);
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} else {
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gethostname(buf, 255);
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if (opt_short) {
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s = strchr(buf, '.');
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if (!s)
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s = buf;
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*s = 0;
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printf("%s\n", buf);
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} else if (opt_domain) {
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s = strchr(buf, '.');
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printf("%s\n", (s ? s + 1 : ""));
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} else if (opt_ip) {
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h = gethostbyname(buf);
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if (!h) {
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printf("Host not found\n");
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exit(1);
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}
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printf("%s\n", inet_ntoa(*(struct in_addr *) (h->h_addr)));
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} else {
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printf("%s\n", buf);
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}
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}
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exit(0);
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}
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