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