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