| /* 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. |
| */ |
| |
| //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_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; |
| |
| #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" |
| ; |
| |
| #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_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; |
| } |