| /* vi: set sw=4 ts=4: */ |
| /* |
| * issue.c: issue printing code |
| * |
| * Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org> |
| * |
| * Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| |
| #include "libbb.h" |
| /* After libbb.h, since it needs sys/types.h on some systems */ |
| #include <sys/utsname.h> |
| |
| #define LOGIN " login: " |
| |
| static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y"; |
| static const char fmtstr_t[] ALIGN1 = "%H:%M:%S"; |
| |
| void FAST_FUNC print_login_issue(const char *issue_file, const char *tty) |
| { |
| FILE *fp; |
| int c; |
| char buf[256+1]; |
| const char *outbuf; |
| time_t t; |
| struct utsname uts; |
| |
| time(&t); |
| uname(&uts); |
| |
| puts("\r"); /* start a new line */ |
| |
| fp = fopen_for_read(issue_file); |
| if (!fp) |
| return; |
| while ((c = fgetc(fp)) != EOF) { |
| outbuf = buf; |
| buf[0] = c; |
| buf[1] = '\0'; |
| if (c == '\n') { |
| buf[1] = '\r'; |
| buf[2] = '\0'; |
| } |
| if (c == '\\' || c == '%') { |
| c = fgetc(fp); |
| switch (c) { |
| case 's': |
| outbuf = uts.sysname; |
| break; |
| case 'n': |
| case 'h': |
| outbuf = uts.nodename; |
| break; |
| case 'r': |
| outbuf = uts.release; |
| break; |
| case 'v': |
| outbuf = uts.version; |
| break; |
| case 'm': |
| outbuf = uts.machine; |
| break; |
| /* The field domainname of struct utsname is Linux specific. */ |
| #if defined(__linux__) |
| case 'D': |
| case 'o': |
| outbuf = uts.domainname; |
| break; |
| #endif |
| case 'd': |
| strftime(buf, sizeof(buf), fmtstr_d, localtime(&t)); |
| break; |
| case 't': |
| strftime(buf, sizeof(buf), fmtstr_t, localtime(&t)); |
| break; |
| case 'l': |
| outbuf = tty; |
| break; |
| default: |
| buf[0] = c; |
| } |
| } |
| fputs(outbuf, stdout); |
| } |
| fclose(fp); |
| fflush_all(); |
| } |
| |
| void FAST_FUNC print_login_prompt(void) |
| { |
| char *hostname = safe_gethostname(); |
| |
| fputs(hostname, stdout); |
| fputs(LOGIN, stdout); |
| fflush_all(); |
| free(hostname); |
| } |
| |
| /* Clear dangerous stuff, set PATH */ |
| static const char forbid[] ALIGN1 = |
| "ENV" "\0" |
| "BASH_ENV" "\0" |
| "HOME" "\0" |
| "IFS" "\0" |
| "SHELL" "\0" |
| "LD_LIBRARY_PATH" "\0" |
| "LD_PRELOAD" "\0" |
| "LD_TRACE_LOADED_OBJECTS" "\0" |
| "LD_BIND_NOW" "\0" |
| "LD_AOUT_LIBRARY_PATH" "\0" |
| "LD_AOUT_PRELOAD" "\0" |
| "LD_NOWARN" "\0" |
| "LD_KEEPDIR" "\0"; |
| |
| int FAST_FUNC sanitize_env_if_suid(void) |
| { |
| const char *p; |
| |
| if (getuid() == geteuid()) |
| return 0; |
| |
| p = forbid; |
| do { |
| unsetenv(p); |
| p += strlen(p) + 1; |
| } while (*p); |
| putenv((char*)bb_PATH_root_path); |
| |
| return 1; /* we indeed were run by different user! */ |
| } |