+/* vi: set sw=4 ts=4: */
/*
- * $Id: hostname.c,v 1.1 1999/12/07 23:14:59 andersen Exp $
* Mini hostname implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
- * 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.
+ * adjusted by Erik Andersen <andersen@codepoet.org> to remove
+ * use of long options and GNU getopt. Improved the usage info.
*
- * 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
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include "internal.h"
-#include <errno.h>
-#include <getopt.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"
-"Options:\n"
-"\t-s, --short\t\tshort\n"
-"\t-i, --ip-address\t\taddresses for the hostname\n"
-"\t-d, --domain\t\tDNS domain name\n"
-"If a hostname is given, or a file is given with the -F parameter, the host\n"
-"name will be set\n";
+#include "libbb.h"
-static char short_opts[] = "sidF:";
-static const struct option long_opts[] = {
- { "short", no_argument, NULL, 's' },
- { "ip-address", no_argument, NULL, 'i' },
- { "domain", no_argument, NULL, 'd' },
- { NULL, 0, NULL, 0 }
-};
-
-void do_sethostname(char *s, int isfile)
+static 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);
+ FILE *f;
+
+ if (!s)
+ return;
+ if (!isfile) {
+ if (sethostname(s, strlen(s)) < 0) {
+ if (errno == EPERM)
+ bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+ else
+ bb_perror_msg_and_die("sethostname");
+ }
} 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);
- }
+ f = xfopen(s, "r");
+#define strbuf bb_common_bufsiz1
+ while (fgets(strbuf, sizeof(strbuf), f) != NULL) {
+ if (strbuf[0] == '#') {
+ continue;
+ }
+ chomp(strbuf);
+ do_sethostname(strbuf, 0);
+ }
+ if (ENABLE_FEATURE_CLEAN_UP)
+ fclose(f);
}
- }
}
+int hostname_main(int argc, char **argv);
int hostname_main(int argc, char **argv)
{
- int c;
- int opt_short = 0;
- int opt_domain = 0;
- int opt_ip = 0;
- int opt_file = 0;
- struct hostent *h;
- char *filename = NULL;
- char buf[255];
- char *s = NULL;
-
- if (argc < 1) usage(hostname_usage);
+ enum {
+ OPT_d = 0x1,
+ OPT_f = 0x2,
+ OPT_i = 0x4,
+ OPT_s = 0x8,
+ OPT_F = 0x10,
+ OPT_dfis = 0xf,
+ };
- while ((c = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
- switch (c) {
- case 's': opt_short = 1; break;
- case 'i': opt_ip = 1; break;
- case 'd': opt_domain = 1; break;
- case 'F': opt_file = 1; filename = optarg; break;
- default: usage(hostname_usage);
- }
- }
+ char buf[256];
+ char *hostname_str;
- if (optind < argc) {
- do_sethostname(argv[optind], 0);
- } else if (opt_file) {
- 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;
+ if (argc < 1)
+ bb_show_usage();
+
+ getopt32(argv, "dfisF:", &hostname_str);
+
+ /* Output in desired format */
+ if (option_mask32 & OPT_dfis) {
+ struct hostent *hp;
+ char *p;
+ gethostname(buf, sizeof(buf));
+ hp = xgethostbyname(buf);
+ p = strchr(hp->h_name, '.');
+ if (option_mask32 & OPT_f) {
+ puts(hp->h_name);
+ } else if (option_mask32 & OPT_s) {
+ if (p != NULL) {
+ *p = '\0';
+ }
+ puts(hp->h_name);
+ } else if (option_mask32 & OPT_d) {
+ if (p)
+ puts(p + 1);
+ } else if (option_mask32 & OPT_i) {
+ while (hp->h_addr_list[0]) {
+ printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
+ }
+ bb_putchar('\n');
+ }
+ }
+ /* Set the hostname */
+ else if (option_mask32 & OPT_F) {
+ do_sethostname(hostname_str, 1);
+ } else if (optind < argc) {
+ do_sethostname(argv[optind], 0);
+ }
+ /* Or if all else fails,
+ * just print the current hostname */
+ else {
+ gethostname(buf, sizeof(buf));
+ puts(buf);
+ }
+ return 0;
}
-
projects / oweals / busybox.git / blobdiff