blob: 8f080b77549c19dbde6bd6257ac31edcc1bb5952
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * issue.c: issue printing code |
4 | * |
5 | * Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org> |
6 | * |
7 | * Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru> |
8 | * |
9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
10 | */ |
11 | |
12 | #include "libbb.h" |
13 | /* After libbb.h, since it needs sys/types.h on some systems */ |
14 | #include <sys/utsname.h> |
15 | |
16 | #define LOGIN " login: " |
17 | |
18 | static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y"; |
19 | |
20 | void FAST_FUNC print_login_issue(const char *issue_file, const char *tty) |
21 | { |
22 | FILE *fp; |
23 | int c; |
24 | char buf[256+1]; |
25 | const char *outbuf; |
26 | time_t t; |
27 | struct utsname uts; |
28 | |
29 | time(&t); |
30 | uname(&uts); |
31 | |
32 | puts("\r"); /* start a new line */ |
33 | |
34 | fp = fopen_for_read(issue_file); |
35 | if (!fp) |
36 | return; |
37 | while ((c = fgetc(fp)) != EOF) { |
38 | outbuf = buf; |
39 | buf[0] = c; |
40 | buf[1] = '\0'; |
41 | if (c == '\n') { |
42 | buf[1] = '\r'; |
43 | buf[2] = '\0'; |
44 | } |
45 | if (c == '\\' || c == '%') { |
46 | c = fgetc(fp); |
47 | switch (c) { |
48 | case 's': |
49 | outbuf = uts.sysname; |
50 | break; |
51 | case 'n': |
52 | case 'h': |
53 | outbuf = uts.nodename; |
54 | break; |
55 | case 'r': |
56 | outbuf = uts.release; |
57 | break; |
58 | case 'v': |
59 | outbuf = uts.version; |
60 | break; |
61 | case 'm': |
62 | outbuf = uts.machine; |
63 | break; |
64 | /* The field domainname of struct utsname is Linux specific. */ |
65 | #if defined(__linux__) |
66 | case 'D': |
67 | case 'o': |
68 | outbuf = uts.domainname; |
69 | break; |
70 | #endif |
71 | case 'd': |
72 | strftime(buf, sizeof(buf), fmtstr_d, localtime(&t)); |
73 | break; |
74 | case 't': |
75 | strftime_HHMMSS(buf, sizeof(buf), &t); |
76 | break; |
77 | case 'l': |
78 | outbuf = tty; |
79 | break; |
80 | default: |
81 | buf[0] = c; |
82 | } |
83 | } |
84 | fputs(outbuf, stdout); |
85 | } |
86 | fclose(fp); |
87 | fflush_all(); |
88 | } |
89 | |
90 | void FAST_FUNC print_login_prompt(void) |
91 | { |
92 | char *hostname = safe_gethostname(); |
93 | |
94 | fputs(hostname, stdout); |
95 | fputs(LOGIN, stdout); |
96 | fflush_all(); |
97 | free(hostname); |
98 | } |
99 | |
100 | /* Clear dangerous stuff, set PATH */ |
101 | static const char forbid[] ALIGN1 = |
102 | "ENV" "\0" |
103 | "BASH_ENV" "\0" |
104 | "HOME" "\0" |
105 | "IFS" "\0" |
106 | "SHELL" "\0" |
107 | "LD_LIBRARY_PATH" "\0" |
108 | "LD_PRELOAD" "\0" |
109 | "LD_TRACE_LOADED_OBJECTS" "\0" |
110 | "LD_BIND_NOW" "\0" |
111 | "LD_AOUT_LIBRARY_PATH" "\0" |
112 | "LD_AOUT_PRELOAD" "\0" |
113 | "LD_NOWARN" "\0" |
114 | "LD_KEEPDIR" "\0"; |
115 | |
116 | int FAST_FUNC sanitize_env_if_suid(void) |
117 | { |
118 | const char *p; |
119 | |
120 | if (getuid() == geteuid()) |
121 | return 0; |
122 | |
123 | p = forbid; |
124 | do { |
125 | unsetenv(p); |
126 | p += strlen(p) + 1; |
127 | } while (*p); |
128 | putenv((char*)bb_PATH_root_path); |
129 | |
130 | return 1; /* we indeed were run by different user! */ |
131 | } |
132 |