1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini hostname implementation for busybox 4 * 5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org> 6 * 7 * Adjusted by Erik Andersen <andersen@codepoet.org> to remove 8 * use of long options and GNU getopt. Improved the usage info. 9 * 10 * Licensed under GPLv2 or later, see file LICENSE in this source tree. 11 */ 12 13//usage:#define hostname_trivial_usage 14//usage: "[OPTIONS] [HOSTNAME | -F FILE]" 15//usage:#define hostname_full_usage "\n\n" 16//usage: "Get or set hostname or DNS domain name\n" 17//usage: "\n -s Short" 18//usage: "\n -i Addresses for the hostname" 19//usage: "\n -d DNS domain name" 20//usage: "\n -f Fully qualified domain name" 21//usage: "\n -F FILE Use FILE's content as hostname" 22//usage: 23//usage:#define hostname_example_usage 24//usage: "$ hostname\n" 25//usage: "sage\n" 26//usage: 27//usage:#define dnsdomainname_trivial_usage NOUSAGE_STR 28//usage:#define dnsdomainname_full_usage "" 29 30#include "libbb.h" 31 32static void do_sethostname(char *s, int isfile) 33{ 34// if (!s) 35// return; 36 if (isfile) { 37 parser_t *parser = config_open2(s, xfopen_for_read); 38 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) { 39 do_sethostname(s, 0); 40 } 41 if (ENABLE_FEATURE_CLEAN_UP) 42 config_close(parser); 43 } else if (sethostname(s, strlen(s))) { 44// if (errno == EPERM) 45// bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); 46 bb_perror_msg_and_die("sethostname"); 47 } 48} 49 50/* Manpage circa 2009: 51 * 52 * hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [--long] 53 * [-i] [--ip-address] [-s] [--short] [-y] [--yp] [--nis] 54 * 55 * hostname [-v] [-F filename] [--file filename] / [hostname] 56 * 57 * domainname [-v] [-F filename] [--file filename] / [name] 58 * { bbox: not supported } 59 * 60 * nodename [-v] [-F filename] [--file filename] / [name] 61 * { bbox: not supported } 62 * 63 * dnsdomainname [-v] 64 * { bbox: supported: Linux kernel build needs this } 65 * nisdomainname [-v] 66 * { bbox: not supported } 67 * ypdomainname [-v] 68 * { bbox: not supported } 69 * 70 * -a, --alias 71 * Display the alias name of the host (if used). 72 * { bbox: not supported } 73 * -d, --domain 74 * Display the name of the DNS domain. Don't use the command 75 * domainname to get the DNS domain name because it will show the 76 * NIS domain name and not the DNS domain name. Use dnsdomainname 77 * instead. 78 * -f, --fqdn, --long 79 * Display the FQDN (Fully Qualified Domain Name). A FQDN consists 80 * of a short host name and the DNS domain name. Unless you are 81 * using bind or NIS for host lookups you can change the FQDN and 82 * the DNS domain name (which is part of the FQDN) in the 83 * /etc/hosts file. 84 * -i, --ip-address 85 * Display the IP address(es) of the host. 86 * -s, --short 87 * Display the short host name. This is the host name cut at the 88 * first dot. 89 * -v, --verbose 90 * Be verbose and tell what's going on. 91 * { bbox: supported but ignored } 92 * -y, --yp, --nis 93 * Display the NIS domain name. If a parameter is given (or --file 94 * name ) then root can also set a new NIS domain. 95 * { bbox: not supported } 96 * -F, --file filename 97 * Read the host name from the specified file. Comments (lines 98 * starting with a `#') are ignored. 99 */ 100int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 101int hostname_main(int argc UNUSED_PARAM, char **argv) 102{ 103 enum { 104 OPT_d = 0x1, 105 OPT_f = 0x2, 106 OPT_i = 0x4, 107 OPT_s = 0x8, 108 OPT_F = 0x10, 109 OPT_dfis = 0xf, 110 }; 111 112 unsigned opts; 113 char *buf; 114 char *hostname_str; 115 116#if ENABLE_LONG_OPTS 117 applet_long_options = 118 "domain\0" No_argument "d" 119 "fqdn\0" No_argument "f" 120 //Enable if seen in active use in some distro: 121 // "long\0" No_argument "f" 122 // "ip-address\0" No_argument "i" 123 // "short\0" No_argument "s" 124 // "verbose\0" No_argument "v" 125 "file\0" No_argument "F" 126 ; 127 128#endif 129 /* dnsdomainname from net-tools 1.60, hostname 1.100 (2001-04-14), 130 * supports hostname's options too (not just -v as manpage says) */ 131 opts = getopt32(argv, "dfisF:v", &hostname_str); 132 argv += optind; 133 buf = safe_gethostname(); 134 if (applet_name[0] == 'd') /* dnsdomainname? */ 135 opts = OPT_d; 136 137 if (opts & OPT_dfis) { 138 /* Cases when we need full hostname (or its part) */ 139 struct hostent *hp; 140 char *p; 141 142 hp = xgethostbyname(buf); 143 p = strchrnul(hp->h_name, '.'); 144 if (opts & OPT_f) { 145 puts(hp->h_name); 146 } else if (opts & OPT_s) { 147 *p = '\0'; 148 puts(hp->h_name); 149 } else if (opts & OPT_d) { 150 if (*p) 151 puts(p + 1); 152 } else /*if (opts & OPT_i)*/ { 153 if (hp->h_length == sizeof(struct in_addr)) { 154 struct in_addr **h_addr_list = (struct in_addr **)hp->h_addr_list; 155 while (*h_addr_list) { 156 printf("%s ", inet_ntoa(**h_addr_list)); 157 h_addr_list++; 158 } 159 bb_putchar('\n'); 160 } 161 } 162 } else if (opts & OPT_F) { 163 /* Set the hostname */ 164 do_sethostname(hostname_str, 1); 165 } else if (argv[0]) { 166 /* Set the hostname */ 167 do_sethostname(argv[0], 0); 168 } else { 169 /* Just print the current hostname */ 170 puts(buf); 171 } 172 173 if (ENABLE_FEATURE_CLEAN_UP) 174 free(buf); 175 return EXIT_SUCCESS; 176} 177