*
* Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-
-#include <sys/param.h> /* MAXHOSTNAMELEN */
-#include <stdio.h>
-#include <unistd.h>
#include "libbb.h"
-
+/* After libbb.h, since it needs sys/types.h on some systems */
#include <sys/utsname.h>
-#include <time.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";
-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;
+ FILE *fp;
int c;
char buf[256+1];
const char *outbuf;
time(&t);
uname(&uts);
- puts("\r"); /* start a new line */
+ puts("\r"); /* start a new line */
- fd = fopen(issue_file, "r");
- if (!fd)
+ fp = fopen_for_read(issue_file);
+ if (!fp)
return;
- while ((c = fgetc(fd)) != EOF) {
+ while ((c = fgetc(fp)) != EOF) {
outbuf = buf;
buf[0] = c;
buf[1] = '\0';
- if(c == '\n') {
+ if (c == '\n') {
buf[1] = '\r';
buf[2] = '\0';
}
if (c == '\\' || c == '%') {
- c = fgetc(fd);
+ c = fgetc(fp);
switch (c) {
+//From getty manpage (* - supported by us)
+//========================================
+//4 or 4{interface}
+// Insert the IPv4 address of the network interface (example: \4{eth0}).
+// If the interface argument is not specified, then select the first
+// fully configured (UP, non-LOOPBACK, RUNNING) interface.
+//6 or 6{interface} -- The same as \4 but for IPv6.
+//b -- Insert the baudrate of the current line.
+//*d -- Insert the current date.
+//*t -- Insert the current time.
+//e or e{name}
+// Translate the human-readable name to an escape sequence and insert it
+// (for example: \e{red}Alert text.\e{reset}). If the name argument
+// is not specified, then insert \033. The currently supported names are:
+// black, blink, blue, bold, brown, cyan, darkgray, gray, green, halfbright,
+// lightblue, lightcyan, lightgray, lightgreen, lightmagenta, lightred,
+// magenta, red, reset, reverse, and yellow. Unknown names are ignored.
+//*s
+// Insert the system name (the name of the operating system - `uname -s`)
+//*S or S{VARIABLE}
+// Insert the VARIABLE data from /etc/os-release.
+// If the VARIABLE argument is not specified, use PRETTY_NAME.
+// If PRETTY_NAME is not in /etc/os-release, \S is the same as \s.
+//*l -- Insert the name of the current tty line.
+//*m -- Insert the architecture identifier of the machine: `uname -m`.
+//*n -- Insert the nodename of the machine: `uname -n`.
+//*o -- Insert the NIS domainname of the machine. Same as `hostname -d'.
+//*O -- Insert the DNS domainname of the machine.
+//*r -- Insert the release number of the OS: `uname -r`.
+//u -- Insert the number of current users logged in.
+//U -- Insert the string "1 user" or "N users" (current users logged in).
+//*v -- Insert the version of the OS, e.g. the build-date etc: `uname -v`.
+//We also implement:
+//*D -- same as \O "DNS domainname"
+//*h -- same as \n "nodename"
+
+ case 'S':
+ /* minimal implementation, not reading /etc/os-release */
+ /*FALLTHROUGH*/
case 's':
outbuf = uts.sysname;
break;
case 'n':
+ case 'h':
outbuf = uts.nodename;
break;
case 'r':
case 'm':
outbuf = uts.machine;
break;
+/* The field domainname of struct utsname is Linux specific. */
+#if defined(__linux__)
case 'D':
case 'o':
- c = getdomainname(buf, sizeof(buf) - 1);
- buf[c >= 0 ? c : 0] = '\0';
+ 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 'h':
- gethostname(buf, sizeof(buf) - 1);
- buf[sizeof(buf) - 1] = '\0';
+ strftime_HHMMSS(buf, sizeof(buf), &t);
break;
case 'l':
outbuf = tty;
}
fputs(outbuf, stdout);
}
- fclose(fd);
- fflush(stdout);
+ fclose(fp);
+ fflush_all();
}
-void print_login_prompt(void)
+void FAST_FUNC print_login_prompt(void)
{
- char buf[MAXHOSTNAMELEN+1];
-
- if (gethostname(buf, MAXHOSTNAMELEN) == 0)
- fputs(buf, stdout);
+ char *hostname = safe_gethostname();
+ fputs(hostname, stdout);
fputs(LOGIN, stdout);
- fflush(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! */
}
projects / oweals / busybox.git / blobdiff