* versions of 'who', 'last', etc. IP Addr is output in hex,
* little endian on x86.
*
- * made against libc6
*/
-#include "internal.h"
-#include <stdio.h>
-#include <errno.h>
-#define BB_DECLARE_EXTERN
-#define bb_need_io_error
-#include "messages.c"
+/* Mar 13, 2003 Manuel Novoa III
+ *
+ * 1) Added proper error checking.
+ * 2) Allow '-' arg for stdin.
+ * 3) For modern libcs, take into account that utmp char[] members
+ * need not be nul-terminated.
+ */
-#if defined(__GLIBC__)
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
#include <utmp.h>
-#else
-#include <utmp-wrap.h>
-#define utmp new_utmp
-#endif
+#include "busybox.h"
+/* Grr... utmp char[] members do not have to be nul-terminated.
+ * Do what we can while still keeping this reasonably small.
+ * Note: We are assuming the ut_id[] size is fixed at 4. */
-static const char dutmp_usage[] = "dutmp [FILE]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nDump utmp file format (pipe delimited) from FILE\n"
- "or stdin to stdout. (i.e. 'dutmp /var/run/utmp')\n"
+#if __GNU_LIBRARY__ < 5
+#warning the format string needs to be changed
+#else
+#if (UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)
+#error struct utmp member char[] size(s) have changed!
+#endif
#endif
- ;
extern int dutmp_main(int argc, char **argv)
{
-
- FILE *f;
+ int file = STDIN_FILENO;
+ ssize_t n;
struct utmp ut;
- if (argc<2) {
- f = stdin;
- } else if (*argv[1] == '-' ) {
- usage(dutmp_usage);
- } else {
- f = fopen(argv[1], "r");
- if (f == NULL) {
- fatalError(io_error, argv[1], strerror(errno));
- }
+ if (argc > 2) {
+ bb_show_usage();
+ }
+ ++argv;
+ if ((argc == 2) && ((argv[0][0] != '-') || argv[0][1])) {
+ file = bb_xopen(*argv, O_RDONLY);
}
- while (fread(&ut, sizeof(struct utmp), 1, f)) {
- printf("%d|%d|%s|%s|%s|%s|%d|%d|%ld|%ld|%ld|%x\n",
- ut.ut_type, ut.ut_pid, ut.ut_line,
- ut.ut_id, ut.ut_user, ut.ut_host,
- ut.ut_exit.e_termination, ut.ut_exit.e_exit,
- ut.ut_session, ut.ut_tv.tv_sec, ut.ut_tv.tv_usec,
- ut.ut_addr_v6[0]);
+
+ while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
+
+ if (n != sizeof(struct utmp)) {
+ bb_perror_msg_and_die("short read");
+ }
+
+ /* Kludge around the fact that the binary format for utmp has changed. */
+#if __GNU_LIBRARY__ < 5
+ /* Linux libc5 */
+
+ bb_printf("%d|%d|%s|%s|%s|%s|%s|%lx\n",
+ ut.ut_type, ut.ut_pid, ut.ut_line,
+ ut.ut_id, ut.ut_user, ut.ut_host,
+ ctime(&(ut.ut_time)),
+ (long)ut.ut_addr);
+#else
+ /* Glibc, uClibc, etc. */
+
+ bb_printf("%d|%d|%.32s|%.4s|%.32s|%.256s|%d|%d|%ld|%ld|%ld|%x\n",
+ ut.ut_type, ut.ut_pid, ut.ut_line,
+ ut.ut_id, ut.ut_user, ut.ut_host,
+ ut.ut_exit.e_termination, ut.ut_exit.e_exit,
+ ut.ut_session,
+ ut.ut_tv.tv_sec, ut.ut_tv.tv_usec,
+ ut.ut_addr);
+#endif
}
- exit(TRUE);
+ bb_fflush_stdout_and_exit(EXIT_SUCCESS);
}