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1 /*
2 Copyright (c) DFN-CERT, Univ. of Hamburg 1994
3
4 Univ. Hamburg, Dept. of Computer Science
5 DFN-CERT
6 Vogt-Koelln-Strasse 30
7 22527 Hamburg
8 Germany
9
10 02/20/97 - Minimal changes for Linux/FreeBSD port.
11 Nelson Murilo, nelson@pangeia.com.br
12 09/07/00 - Ports for Solaris
13 Andre Gustavo <gustavo@anita.visualnet.com.br>
14 12/15/00 - Add -f option
15 Nelson Murilo, nelson@pangeia.com.br
16 07/08/04 - fix del counter value (Thanks to Dietrich Raisin)
17 Nelson Murilo, nelson@pangeia.com.br
18 09/12/05 - fix Segfault (Thanks to Jérémie Andréi)
19 Nelson Murilo, nelson@pangeia.com.br
20 */
21
22 #if __FreeBSD__ > 9
23 int main () { return 0; }
24 #else
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <unistd.h>
28 #include <string.h>
29 #include <utmp.h>
30 #include <time.h>
31 #include <sys/time.h>
32 #include <sys/file.h>
33 #ifdef SOLARIS2
34 #include <fcntl.h>
35 #endif
36
37 #ifdef __FreeBSD__
38 #define WTMP_FILENAME "/var/log/wtmp"
39 #else
40 #ifndef WTMP_FILENAME
41 #define WTMP_FILENAME "/var/adm/wtmp"
42 #endif
43 #endif
44
45 void printit(counter, start, end)
46 int counter;
47 long start,end;
48 {
49 char buffer[30];
50
51 printf("%d deletion(s) between ", counter);
52 strncpy(buffer, ctime( (time_t *) &start), 30);
53 buffer[24]='\0';
54 printf("%s and %s", buffer, ctime( (time_t *) &end));
55 }
56
57
58 int main(int argc, char*argv[]) {
59 int filehandle;
60 struct utmp utmp_ent;
61 struct timeval mytime;
62 struct timezone dummy;
63 long start_time, act_time;
64 int del_counter, t_del;
65 char wtmpfile[128];
66
67 del_counter=t_del=0;
68 start_time=0;
69
70 gettimeofday(&mytime, &dummy);
71 act_time=mytime.tv_sec;
72 wtmpfile[127]='\0';
73 memcpy(wtmpfile, WTMP_FILENAME, 127);
74 if ( argc == 3 && !memcmp("-f", argv[1], 2) && *argv[2])
75 memcpy(wtmpfile, argv[2], 127);
76
77 if ((filehandle=open(wtmpfile,O_RDONLY)) < 0) {
78 fprintf(stderr, "unable to open wtmp-file %s\n", wtmpfile);
79 return(2);
80 }
81
82 while (read (filehandle, (char *) &utmp_ent, sizeof (struct utmp)) > 0) {
83 if (utmp_ent.ut_time == 0)
84 del_counter++;
85 else {
86 if (del_counter) {
87 printit(del_counter, start_time,
88 utmp_ent.ut_time);
89 t_del++;
90 del_counter=0;
91 }
92 start_time=utmp_ent.ut_time;
93 }
94 }
95 close(filehandle);
96 if (del_counter)
97 printit(del_counter, start_time, act_time);
98 exit((int) t_del+del_counter);
99 }
100 #endif