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    Contents of /tags/mkinitrd-6_1_12/busybox/libbb/login.c

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    Revision 939 - (show annotations) (download)
    Tue Nov 17 21:24:51 2009 UTC (14 years, 6 months ago) by niro
    File MIME type: text/plain
    File size: 2383 byte(s) 
    tagged 'mkinitrd-6_1_12'
    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 }