loginacct/dump_utmpx.c

+/* dump_utmpx.c
+
+   Display the contents of the utmp-style file named on the command line.
+
+   This version of the program differs from that which appears in the book in
+   that it prints extra information from each utmpx record.
+
+   This program is Linux-specific.
+*/
 #define _GNU_SOURCE
 #include <time.h>
 #include <utmpx.h>
 #include <paths.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
 #include "tlpi_hdr.h"
 
 int
 main(int argc, char *argv[])
 {
     struct utmpx *ut;
+    struct in_addr in;
 
     if (argc > 1 && strcmp(argv[1], "--help") == 0)
         usageErr("%s [utmp-pathname]\n", argv[0]);
 
     if (argc > 1)               /* Use alternate file if supplied */
         if (utmpxname(argv[1]) == -1)
             errExit("utmpxname");
 
     setutxent();
 
-    printf("user     type        PID line   id  host      date/time\n");
+    printf("user     type            PID line   id  host     ");
+    printf("term exit session  address         date/time\n");
 
     while ((ut = getutxent()) != NULL) {        /* Sequential scan to EOF */
         printf("%-8s ", ut->ut_user);
         printf("%-9.9s ",
                 (ut->ut_type == EMPTY) ?         "EMPTY" :
                 (ut->ut_type == RUN_LVL) ?       "RUN_LVL" :
                 (ut->ut_type == BOOT_TIME) ?     "BOOT_TIME" :
                 (ut->ut_type == NEW_TIME) ?      "NEW_TIME" :
                 (ut->ut_type == OLD_TIME) ?      "OLD_TIME" :
                 (ut->ut_type == INIT_PROCESS) ?  "INIT_PR" :
                 (ut->ut_type == LOGIN_PROCESS) ? "LOGIN_PR" :
                 (ut->ut_type == USER_PROCESS) ?  "USER_PR" :
                 (ut->ut_type == DEAD_PROCESS) ?  "DEAD_PR" : "???");
+        printf("(%1d) ", ut->ut_type);
         printf("%5ld %-6.6s %-3.5s %-9.9s ", (long) ut->ut_pid,
                 ut->ut_line, ut->ut_id, ut->ut_host);
+        printf("%3d %3d ", ut->ut_exit.e_termination, ut->ut_exit.e_exit);
+        printf("%8ld ", (long) ut->ut_session);
+
+        /* Display IPv4 address */
+
+        in.s_addr = ut->ut_addr_v6[0];
+        printf(" %-15.15s ", inet_ntoa(in));
         time_t tv_sec = ut->ut_tv.tv_sec;
         printf("%s", ctime(&tv_sec));
     }
+
     endutxent();
     exit(EXIT_SUCCESS);
 }