1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * issue.c: issue printing code
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4 | *
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5 | * Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org>
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6 | *
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7 | * Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru>
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8 | *
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9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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10 | */
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11 |
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12 | #include "libbb.h"
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13 | /* After libbb.h, since it needs sys/types.h on some systems */
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14 | #include <sys/utsname.h>
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15 |
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16 | #define LOGIN " login: "
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17 |
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18 | static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y";
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19 |
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20 | void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
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21 | {
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22 | FILE *fp;
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23 | int c;
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24 | char buf[256+1];
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25 | const char *outbuf;
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26 | time_t t;
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27 | struct utsname uts;
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28 |
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29 | time(&t);
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30 | uname(&uts);
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31 |
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32 | puts("\r"); /* start a new line */
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33 |
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34 | fp = fopen_for_read(issue_file);
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35 | if (!fp)
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36 | return;
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37 | while ((c = fgetc(fp)) != EOF) {
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38 | outbuf = buf;
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39 | buf[0] = c;
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40 | buf[1] = '\0';
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41 | if (c == '\n') {
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42 | buf[1] = '\r';
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43 | buf[2] = '\0';
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44 | }
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45 | if (c == '\\' || c == '%') {
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46 | c = fgetc(fp);
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47 | switch (c) {
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48 | case 's':
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49 | outbuf = uts.sysname;
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50 | break;
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51 | case 'n':
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52 | case 'h':
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53 | outbuf = uts.nodename;
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54 | break;
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55 | case 'r':
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56 | outbuf = uts.release;
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57 | break;
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58 | case 'v':
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59 | outbuf = uts.version;
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60 | break;
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61 | case 'm':
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62 | outbuf = uts.machine;
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63 | break;
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64 | /* The field domainname of struct utsname is Linux specific. */
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65 | #if defined(__linux__)
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66 | case 'D':
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67 | case 'o':
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68 | outbuf = uts.domainname;
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69 | break;
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70 | #endif
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71 | case 'd':
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72 | strftime(buf, sizeof(buf), fmtstr_d, localtime(&t));
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73 | break;
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74 | case 't':
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75 | strftime_HHMMSS(buf, sizeof(buf), &t);
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76 | break;
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77 | case 'l':
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78 | outbuf = tty;
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79 | break;
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80 | default:
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81 | buf[0] = c;
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82 | }
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83 | }
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84 | fputs(outbuf, stdout);
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85 | }
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86 | fclose(fp);
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87 | fflush_all();
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88 | }
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89 |
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90 | void FAST_FUNC print_login_prompt(void)
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91 | {
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92 | char *hostname = safe_gethostname();
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93 |
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94 | fputs(hostname, stdout);
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95 | fputs(LOGIN, stdout);
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96 | fflush_all();
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97 | free(hostname);
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98 | }
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99 |
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100 | /* Clear dangerous stuff, set PATH */
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101 | static const char forbid[] ALIGN1 =
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102 | "ENV" "\0"
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103 | "BASH_ENV" "\0"
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104 | "HOME" "\0"
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105 | "IFS" "\0"
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106 | "SHELL" "\0"
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107 | "LD_LIBRARY_PATH" "\0"
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108 | "LD_PRELOAD" "\0"
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109 | "LD_TRACE_LOADED_OBJECTS" "\0"
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110 | "LD_BIND_NOW" "\0"
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111 | "LD_AOUT_LIBRARY_PATH" "\0"
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112 | "LD_AOUT_PRELOAD" "\0"
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113 | "LD_NOWARN" "\0"
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114 | "LD_KEEPDIR" "\0";
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115 |
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116 | int FAST_FUNC sanitize_env_if_suid(void)
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117 | {
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118 | const char *p;
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119 |
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120 | if (getuid() == geteuid())
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121 | return 0;
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122 |
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123 | p = forbid;
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124 | do {
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125 | unsetenv(p);
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126 | p += strlen(p) + 1;
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127 | } while (*p);
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128 | putenv((char*)bb_PATH_root_path);
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129 |
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130 | return 1; /* we indeed were run by different user! */
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131 | }
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