/* 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. * * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include "libbb.h" static void do_sethostname(char *s, int isfile) { FILE *f; if (!s) return; if (!isfile) { if (sethostname(s, strlen(s)) < 0) { if (errno == EPERM) bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); bb_perror_msg_and_die("sethostname"); } } else { f = xfopen(s, "r"); #define strbuf bb_common_bufsiz1 while (fgets(strbuf, sizeof(strbuf), f) != NULL) { if (strbuf[0] == '#') { continue; } chomp(strbuf); do_sethostname(strbuf, 0); } if (ENABLE_FEATURE_CLEAN_UP) fclose(f); } } int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int hostname_main(int argc, char **argv) { enum { OPT_d = 0x1, OPT_f = 0x2, OPT_i = 0x4, OPT_s = 0x8, OPT_F = 0x10, OPT_dfis = 0xf, }; char *buf; char *hostname_str; if (argc < 1) bb_show_usage(); getopt32(argv, "dfisF:", &hostname_str); argv += optind; buf = safe_gethostname(); /* Output in desired format */ if (option_mask32 & OPT_dfis) { struct hostent *hp; char *p; hp = xgethostbyname(buf); p = strchr(hp->h_name, '.'); if (option_mask32 & OPT_f) { puts(hp->h_name); } else if (option_mask32 & OPT_s) { if (p) *p = '\0'; puts(hp->h_name); } else if (option_mask32 & OPT_d) { if (p) puts(p + 1); } else if (option_mask32 & OPT_i) { while (hp->h_addr_list[0]) { printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++))); } bb_putchar('\n'); } } /* Set the hostname */ else if (option_mask32 & OPT_F) { do_sethostname(hostname_str, 1); } else if (argv[0]) { do_sethostname(argv[0], 0); } /* Or if all else fails, * just print the current hostname */ else { puts(buf); } if (ENABLE_FEATURE_CLEAN_UP) free(buf); return 0; }