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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 11 * 12 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 13 */ 14 15#include "libbb.h" 16 17static void do_sethostname(char *s, int isfile) 18{ 19 FILE *f; 20 21 if (!s) 22 return; 23 if (!isfile) { 24 if (sethostname(s, strlen(s)) < 0) { 25 if (errno == EPERM) 26 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); 27 else 28 bb_perror_msg_and_die("sethostname"); 29 } 30 } else { 31 f = xfopen(s, "r"); 32#define strbuf bb_common_bufsiz1 33 while (fgets(strbuf, sizeof(strbuf), f) != NULL) { 34 if (strbuf[0] == '#') { 35 continue; 36 } 37 chomp(strbuf); 38 do_sethostname(strbuf, 0); 39 } 40 if (ENABLE_FEATURE_CLEAN_UP) 41 fclose(f); 42 } 43} 44 45int hostname_main(int argc, char **argv); 46int hostname_main(int argc, char **argv) 47{ 48 enum { 49 OPT_d = 0x1, 50 OPT_f = 0x2, 51 OPT_i = 0x4, 52 OPT_s = 0x8, 53 OPT_F = 0x10, 54 OPT_dfis = 0xf, 55 }; 56 57 char buf[256]; 58 char *hostname_str; 59 60 if (argc < 1) 61 bb_show_usage(); 62 63 getopt32(argv, "dfisF:", &hostname_str); 64 65 /* Output in desired format */ 66 if (option_mask32 & OPT_dfis) { 67 struct hostent *hp; 68 char *p; 69 gethostname(buf, sizeof(buf)); 70 hp = xgethostbyname(buf); 71 p = strchr(hp->h_name, '.'); 72 if (option_mask32 & OPT_f) { 73 puts(hp->h_name); 74 } else if (option_mask32 & OPT_s) { 75 if (p != NULL) { 76 *p = '\0'; 77 } 78 puts(hp->h_name); 79 } else if (option_mask32 & OPT_d) { 80 if (p) 81 puts(p + 1); 82 } else if (option_mask32 & OPT_i) { 83 while (hp->h_addr_list[0]) { 84 printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++))); 85 } 86 puts(""); 87 } 88 } 89 /* Set the hostname */ 90 else if (option_mask32 & OPT_F) { 91 do_sethostname(hostname_str, 1); 92 } else if (optind < argc) { 93 do_sethostname(argv[optind], 0); 94 } 95 /* Or if all else fails, 96 * just print the current hostname */ 97 else { 98 gethostname(buf, sizeof(buf)); 99 puts(buf); 100 } 101 return 0; 102} 103