+/* vi: set sw=4 ts=4: */
/*
* issue.c: issue printing code
*
* Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
* Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <sys/param.h> /* MAXHOSTNAMELEN */
-#include <stdio.h>
-#include <unistd.h>
-#include "libbb.h"
-
#include <sys/utsname.h>
-#include <time.h>
+#include "libbb.h"
#define LOGIN " login: "
-static const char fmtstr_d[] = "%A, %d %B %Y";
-static const char fmtstr_t[] = "%H:%M:%S";
+static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y";
+static const char fmtstr_t[] ALIGN1 = "%H:%M:%S";
-void print_login_issue(const char *issue_file, const char *tty)
+void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
{
FILE *fd;
int c;
- char buf[256];
+ char buf[256+1];
const char *outbuf;
time_t t;
struct utsname uts;
puts("\r"); /* start a new line */
- if ((fd = fopen(issue_file, "r"))) {
- while ((c = fgetc(fd)) != EOF) {
- outbuf = buf;
- buf[0] = c;
- if(c == '\n') {
- buf[1] = '\r';
- buf[2] = 0;
- } else {
- buf[1] = 0;
- }
- if (c == '\\' || c == '%') {
- c = fgetc(fd);
- switch (c) {
- case 's':
- outbuf = uts.sysname;
- break;
-
- case 'n':
- outbuf = uts.nodename;
- break;
-
- case 'r':
- outbuf = uts.release;
- break;
-
- case 'v':
- outbuf = uts.version;
- break;
-
- case 'm':
- outbuf = uts.machine;
- break;
-
- case 'D':
- case 'o':
- getdomainname(buf, sizeof(buf));
- buf[sizeof(buf) - 1] = '\0';
- break;
-
- case 'd':
- strftime(buf, sizeof(buf), fmtstr_d, localtime(&t));
- break;
-
- case 't':
- strftime(buf, sizeof(buf), fmtstr_t, localtime(&t));
- break;
-
- case 'h':
- gethostname(buf, sizeof(buf) - 1);
- break;
-
- case 'l':
- outbuf = tty;
- break;
-
- default:
- buf[0] = c;
- }
+ fd = fopen(issue_file, "r");
+ if (!fd)
+ return;
+ while ((c = fgetc(fd)) != EOF) {
+ outbuf = buf;
+ buf[0] = c;
+ buf[1] = '\0';
+ if (c == '\n') {
+ buf[1] = '\r';
+ buf[2] = '\0';
}
- fputs(outbuf, stdout);
+ if (c == '\\' || c == '%') {
+ c = fgetc(fd);
+ 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;
+ case 'D':
+ case 'o':
+ c = getdomainname(buf, sizeof(buf) - 1);
+ buf[c >= 0 ? c : 0] = '\0';
+ break;
+ 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;
+ }
}
-
- fclose(fd);
-
- fflush(stdout);
+ fputs(outbuf, stdout);
}
+ fclose(fd);
+ fflush(stdout);
}
-void print_login_prompt(void)
+void FAST_FUNC print_login_prompt(void)
{
- char buf[MAXHOSTNAMELEN+1];
-
- gethostname(buf, MAXHOSTNAMELEN);
- fputs(buf, stdout);
+ 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! */
+}
projects / oweals / busybox.git / blobdiff