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https://github.com/sheumann/hush.git
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103 lines
2.1 KiB
C
103 lines
2.1 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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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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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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FILE *f;
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if (!s)
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return;
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if (!isfile) {
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if (sethostname(s, strlen(s)) < 0) {
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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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else
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bb_perror_msg_and_die("sethostname");
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}
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} else {
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f = xfopen(s, "r");
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#define strbuf bb_common_bufsiz1
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while (fgets(strbuf, sizeof(strbuf), f) != NULL) {
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if (strbuf[0] == '#') {
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continue;
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}
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chomp(strbuf);
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do_sethostname(strbuf, 0);
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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fclose(f);
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}
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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, 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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char buf[256];
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char *hostname_str;
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if (argc < 1)
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bb_show_usage();
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getopt32(argv, "dfisF:", &hostname_str);
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/* Output in desired format */
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if (option_mask32 & OPT_dfis) {
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struct hostent *hp;
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char *p;
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gethostname(buf, sizeof(buf));
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hp = xgethostbyname(buf);
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p = strchr(hp->h_name, '.');
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if (option_mask32 & OPT_f) {
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puts(hp->h_name);
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} else if (option_mask32 & OPT_s) {
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if (p != NULL) {
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*p = '\0';
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}
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puts(hp->h_name);
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} else if (option_mask32 & OPT_d) {
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if (p)
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puts(p + 1);
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} else if (option_mask32 & OPT_i) {
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while (hp->h_addr_list[0]) {
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printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->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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/* Set the hostname */
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else if (option_mask32 & OPT_F) {
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do_sethostname(hostname_str, 1);
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} else if (optind < argc) {
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do_sethostname(argv[optind], 0);
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}
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/* Or if all else fails,
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* just print the current hostname */
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else {
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gethostname(buf, sizeof(buf));
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puts(buf);
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}
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return 0;
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}
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