/* vi: set sw=4 ts=4: */ /* * Mini hostname implementation for busybox * * Copyright (C) 1999 by Randolph Chung <tausq@debian.org> * * Adjusted by Erik Andersen <andersen@codepoet.org> to remove * use of long options and GNU getopt. Improved the usage info. * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ //config:config HOSTNAME //config: bool "hostname (5.5 kb)" //config: default y //config: help //config: Show or set the system's host name. //config: //config:config DNSDOMAINNAME //config: bool "dnsdomainname (3.6 kb)" //config: default y //config: help //config: Alias to "hostname -d". // APPLET_NOEXEC:name main location suid_type help //applet:IF_DNSDOMAINNAME(APPLET_NOEXEC(dnsdomainname, hostname, BB_DIR_BIN, BB_SUID_DROP, dnsdomainname)) //applet:IF_HOSTNAME( APPLET_NOEXEC(hostname, hostname, BB_DIR_BIN, BB_SUID_DROP, hostname )) //kbuild: lib-$(CONFIG_HOSTNAME) += hostname.o //kbuild: lib-$(CONFIG_DNSDOMAINNAME) += hostname.o //usage:#define hostname_trivial_usage //usage: "[OPTIONS] [HOSTNAME | -F FILE]" //usage:#define hostname_full_usage "\n\n" //usage: "Get or set hostname or DNS domain name\n" //usage: "\n -s Short" //usage: "\n -i Addresses for the hostname" //usage: "\n -d DNS domain name" //usage: "\n -f Fully qualified domain name" //usage: "\n -F FILE Use FILE's content as hostname" //usage: //usage:#define hostname_example_usage //usage: "$ hostname\n" //usage: "sage\n" //usage: //usage:#define dnsdomainname_trivial_usage NOUSAGE_STR //usage:#define dnsdomainname_full_usage "" #include "libbb.h" static void do_sethostname(char *s, int isfile) { // 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_simple_perror_msg_and_die("sethostname"); } } /* 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) { enum { OPT_d = 0x1, OPT_f = 0x2, OPT_i = 0x4, OPT_s = 0x8, OPT_F = 0x10, OPT_dfi = 0x7, }; unsigned opts; char *buf; char *hostname_str; /* 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, "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" ); argv += optind; buf = safe_gethostname(); if (ENABLE_DNSDOMAINNAME) { if (!ENABLE_HOSTNAME || applet_name[0] == 'd') { /* dnsdomainname */ opts = OPT_d; } } if (opts & OPT_dfi) { /* 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)*/ { if (hp->h_length == sizeof(struct in_addr)) { struct in_addr **h_addr_list = (struct in_addr **)hp->h_addr_list; while (*h_addr_list) { printf(h_addr_list[1] ? "%s " : "%s", inet_ntoa(**h_addr_list)); h_addr_list++; } bb_putchar('\n'); } } } else if (opts & OPT_s) { strchrnul(buf, '.')[0] = '\0'; puts(buf); } 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); } if (ENABLE_FEATURE_CLEAN_UP) free(buf); return EXIT_SUCCESS; }