/* 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 tarball for details. */ #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(stdout); } void FAST_FUNC print_login_prompt(void) { char *hostname = safe_gethostname(); fputs(hostname, stdout); fputs(LOGIN, stdout); fflush(stdout); 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! */ }