1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini hostname implementation for busybox
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4 | *
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5 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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6 | *
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7 | * adjusted by Erik Andersen <andersen@codepoet.org> to remove
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8 | * use of long options and GNU getopt. Improved the usage info.
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9 | *
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10 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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11 | *
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12 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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13 | */
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14 |
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15 | #include "libbb.h"
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16 |
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17 | static void do_sethostname(char *s, int isfile)
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18 | {
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19 | FILE *f;
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20 |
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21 | if (!s)
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22 | return;
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23 | if (!isfile) {
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24 | if (sethostname(s, strlen(s)) < 0) {
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25 | if (errno == EPERM)
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26 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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27 | else
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28 | bb_perror_msg_and_die("sethostname");
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29 | }
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30 | } else {
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31 | f = xfopen(s, "r");
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32 | #define strbuf bb_common_bufsiz1
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33 | while (fgets(strbuf, sizeof(strbuf), f) != NULL) {
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34 | if (strbuf[0] == '#') {
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35 | continue;
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36 | }
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37 | chomp(strbuf);
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38 | do_sethostname(strbuf, 0);
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39 | }
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40 | if (ENABLE_FEATURE_CLEAN_UP)
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41 | fclose(f);
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42 | }
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43 | }
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44 |
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45 | int hostname_main(int argc, char **argv);
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46 | int hostname_main(int argc, char **argv)
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47 | {
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48 | enum {
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49 | OPT_d = 0x1,
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50 | OPT_f = 0x2,
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51 | OPT_i = 0x4,
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52 | OPT_s = 0x8,
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53 | OPT_F = 0x10,
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54 | OPT_dfis = 0xf,
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55 | };
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56 |
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57 | char buf[256];
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58 | char *hostname_str;
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59 |
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60 | if (argc < 1)
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61 | bb_show_usage();
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62 |
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63 | getopt32(argv, "dfisF:", &hostname_str);
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64 |
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65 | /* Output in desired format */
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66 | if (option_mask32 & OPT_dfis) {
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67 | struct hostent *hp;
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68 | char *p;
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69 | gethostname(buf, sizeof(buf));
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70 | hp = xgethostbyname(buf);
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71 | p = strchr(hp->h_name, '.');
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72 | if (option_mask32 & OPT_f) {
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73 | puts(hp->h_name);
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74 | } else if (option_mask32 & OPT_s) {
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75 | if (p != NULL) {
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76 | *p = '\0';
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77 | }
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78 | puts(hp->h_name);
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79 | } else if (option_mask32 & OPT_d) {
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80 | if (p)
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81 | puts(p + 1);
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82 | } else if (option_mask32 & OPT_i) {
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83 | while (hp->h_addr_list[0]) {
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84 | printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
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85 | }
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86 | puts("");
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87 | }
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88 | }
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89 | /* Set the hostname */
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90 | else if (option_mask32 & OPT_F) {
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91 | do_sethostname(hostname_str, 1);
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92 | } else if (optind < argc) {
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93 | do_sethostname(argv[optind], 0);
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94 | }
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95 | /* Or if all else fails,
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96 | * just print the current hostname */
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97 | else {
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98 | gethostname(buf, sizeof(buf));
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99 | puts(buf);
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100 | }
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101 | return 0;
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102 | }
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