/* vi: set sw=4 ts=4: */
/*
- * $Id: hostname.c,v 1.7 2000/02/08 19:58:47 erik Exp $
* Mini hostname implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
- * adjusted by Erik Andersen <andersee@debian.org> to remove
+ * Adjusted by Erik Andersen <andersen@codepoet.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
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
+#include "libbb.h"
-#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)
+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);
- } 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);
- }
+// if (!s)
+// return;
+ if (isfile) {
+ parser_t *parser = config_open2(s, xfopen_for_read);
+ while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
+ do_sethostname(s, 0);
}
+ if (ENABLE_FEATURE_CLEAN_UP)
+ config_close(parser);
+ } else if (sethostname(s, strlen(s))) {
+// if (errno == EPERM)
+// bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+ bb_perror_msg_and_die("sethostname");
}
}
-int hostname_main(int argc, char **argv)
+/* Manpage circa 2009:
+ *
+ * hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [--long]
+ * [-i] [--ip-address] [-s] [--short] [-y] [--yp] [--nis]
+ *
+ * hostname [-v] [-F filename] [--file filename] / [hostname]
+ *
+ * domainname [-v] [-F filename] [--file filename] / [name]
+ * { bbox: not supported }
+ *
+ * nodename [-v] [-F filename] [--file filename] / [name]
+ * { bbox: not supported }
+ *
+ * dnsdomainname [-v]
+ * { bbox: supported: Linux kernel build needs this }
+ * nisdomainname [-v]
+ * { bbox: not supported }
+ * ypdomainname [-v]
+ * { bbox: not supported }
+ *
+ * -a, --alias
+ * Display the alias name of the host (if used).
+ * { bbox: not supported }
+ * -d, --domain
+ * Display the name of the DNS domain. Don't use the command
+ * domainname to get the DNS domain name because it will show the
+ * NIS domain name and not the DNS domain name. Use dnsdomainname
+ * instead.
+ * -f, --fqdn, --long
+ * Display the FQDN (Fully Qualified Domain Name). A FQDN consists
+ * of a short host name and the DNS domain name. Unless you are
+ * using bind or NIS for host lookups you can change the FQDN and
+ * the DNS domain name (which is part of the FQDN) in the
+ * /etc/hosts file.
+ * -i, --ip-address
+ * Display the IP address(es) of the host.
+ * -s, --short
+ * Display the short host name. This is the host name cut at the
+ * first dot.
+ * -v, --verbose
+ * Be verbose and tell what's going on.
+ * { bbox: supported but ignored }
+ * -y, --yp, --nis
+ * Display the NIS domain name. If a parameter is given (or --file
+ * name ) then root can also set a new NIS domain.
+ * { bbox: not supported }
+ * -F, --file filename
+ * Read the host name from the specified file. Comments (lines
+ * starting with a `#') are ignored.
+ */
+int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int hostname_main(int argc UNUSED_PARAM, 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;
+ enum {
+ OPT_d = 0x1,
+ OPT_f = 0x2,
+ OPT_i = 0x4,
+ OPT_s = 0x8,
+ OPT_F = 0x10,
+ OPT_dfis = 0xf,
+ };
- if (argc < 1)
- usage(hostname_usage);
+ unsigned opts;
+ char *buf;
+ char *hostname_str;
- 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 ENABLE_LONG_OPTS
+ applet_long_options =
+ "domain\0" No_argument "d"
+ "fqdn\0" No_argument "f"
+ //Enable if seen in active use in some distro:
+ // "long\0" No_argument "f"
+ // "ip-address\0" No_argument "i"
+ // "short\0" No_argument "s"
+ // "verbose\0" No_argument "v"
+ "file\0" No_argument "F"
+ ;
- 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);
+#endif
+ /* dnsdomainname from net-tools 1.60, hostname 1.100 (2001-04-14),
+ * supports hostname's options too (not just -v as manpage says) */
+ opts = getopt32(argv, "dfisF:v", &hostname_str);
+ argv += optind;
+ buf = safe_gethostname();
+ if (applet_name[0] == 'd') /* dnsdomainname? */
+ opts = OPT_d;
+
+ if (opts & OPT_dfis) {
+ /* Cases when we need full hostname (or its part) */
+ struct hostent *hp;
+ char *p;
+
+ hp = xgethostbyname(buf);
+ p = strchrnul(hp->h_name, '.');
+ if (opts & OPT_f) {
+ puts(hp->h_name);
+ } else if (opts & OPT_s) {
+ *p = '\0';
+ puts(hp->h_name);
+ } else if (opts & OPT_d) {
+ if (*p)
+ puts(p + 1);
+ } else /*if (opts & OPT_i)*/ {
+ while (hp->h_addr_list[0]) {
+ printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
}
- printf("%s\n", inet_ntoa(*(struct in_addr *) (h->h_addr)));
- } else {
- printf("%s\n", buf);
+ bb_putchar('\n');
}
+ } else if (opts & OPT_F) {
+ /* Set the hostname */
+ do_sethostname(hostname_str, 1);
+ } else if (argv[0]) {
+ /* Set the hostname */
+ do_sethostname(argv[0], 0);
+ } else {
+ /* Just print the current hostname */
+ puts(buf);
}
- exit(0);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(buf);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff