Contents of /tags/mkinitrd-6_1_2/busybox/libbb/login.c
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Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
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File size: 2383 byte(s)
Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2383 byte(s)
tagged 'mkinitrd-6_1_2'
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 tarball for details. |
10 | */ |
11 | |
12 | #include <sys/param.h> /* MAXHOSTNAMELEN */ |
13 | #include <sys/utsname.h> |
14 | #include "libbb.h" |
15 | |
16 | #define LOGIN " login: " |
17 | |
18 | static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y"; |
19 | static const char fmtstr_t[] ALIGN1 = "%H:%M:%S"; |
20 | |
21 | void FAST_FUNC print_login_issue(const char *issue_file, const char *tty) |
22 | { |
23 | FILE *fp; |
24 | int c; |
25 | char buf[256+1]; |
26 | const char *outbuf; |
27 | time_t t; |
28 | struct utsname uts; |
29 | |
30 | time(&t); |
31 | uname(&uts); |
32 | |
33 | puts("\r"); /* start a new line */ |
34 | |
35 | fp = fopen_for_read(issue_file); |
36 | if (!fp) |
37 | return; |
38 | while ((c = fgetc(fp)) != EOF) { |
39 | outbuf = buf; |
40 | buf[0] = c; |
41 | buf[1] = '\0'; |
42 | if (c == '\n') { |
43 | buf[1] = '\r'; |
44 | buf[2] = '\0'; |
45 | } |
46 | if (c == '\\' || c == '%') { |
47 | c = fgetc(fp); |
48 | switch (c) { |
49 | case 's': |
50 | outbuf = uts.sysname; |
51 | break; |
52 | case 'n': |
53 | case 'h': |
54 | outbuf = uts.nodename; |
55 | break; |
56 | case 'r': |
57 | outbuf = uts.release; |
58 | break; |
59 | case 'v': |
60 | outbuf = uts.version; |
61 | break; |
62 | case 'm': |
63 | outbuf = uts.machine; |
64 | break; |
65 | case 'D': |
66 | case 'o': |
67 | outbuf = uts.domainname; |
68 | break; |
69 | case 'd': |
70 | strftime(buf, sizeof(buf), fmtstr_d, localtime(&t)); |
71 | break; |
72 | case 't': |
73 | strftime(buf, sizeof(buf), fmtstr_t, localtime(&t)); |
74 | break; |
75 | case 'l': |
76 | outbuf = tty; |
77 | break; |
78 | default: |
79 | buf[0] = c; |
80 | } |
81 | } |
82 | fputs(outbuf, stdout); |
83 | } |
84 | fclose(fp); |
85 | fflush(stdout); |
86 | } |
87 | |
88 | void FAST_FUNC print_login_prompt(void) |
89 | { |
90 | char *hostname = safe_gethostname(); |
91 | |
92 | fputs(hostname, stdout); |
93 | fputs(LOGIN, stdout); |
94 | fflush(stdout); |
95 | free(hostname); |
96 | } |
97 | |
98 | /* Clear dangerous stuff, set PATH */ |
99 | static const char forbid[] ALIGN1 = |
100 | "ENV" "\0" |
101 | "BASH_ENV" "\0" |
102 | "HOME" "\0" |
103 | "IFS" "\0" |
104 | "SHELL" "\0" |
105 | "LD_LIBRARY_PATH" "\0" |
106 | "LD_PRELOAD" "\0" |
107 | "LD_TRACE_LOADED_OBJECTS" "\0" |
108 | "LD_BIND_NOW" "\0" |
109 | "LD_AOUT_LIBRARY_PATH" "\0" |
110 | "LD_AOUT_PRELOAD" "\0" |
111 | "LD_NOWARN" "\0" |
112 | "LD_KEEPDIR" "\0"; |
113 | |
114 | int FAST_FUNC sanitize_env_if_suid(void) |
115 | { |
116 | const char *p; |
117 | |
118 | if (getuid() == geteuid()) |
119 | return 0; |
120 | |
121 | p = forbid; |
122 | do { |
123 | unsetenv(p); |
124 | p += strlen(p) + 1; |
125 | } while (*p); |
126 | putenv((char*)bb_PATH_root_path); |
127 | |
128 | return 1; /* we indeed were run by different user! */ |
129 | } |