1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
Copyright (c) DFN-CERT, Univ. of Hamburg 1994
Univ. Hamburg, Dept. of Computer Science
DFN-CERT
Vogt-Koelln-Strasse 30
22527 Hamburg
Germany
02/20/97 - Minimal changes for Linux/FreeBSD port.
Nelson Murilo, nmurilo@gmail.com
09/07/00 - Ports for Solaris
Andre Gustavo <gustavo@anita.visualnet.com.br>
12/15/00 - Add -f option
Nelson Murilo, nmurilo@gmail.com
07/08/04 - fix del counter value (Thanks to Dietrich Raisin)
Nelson Murilo, nmurilo@gmail.com
09/12/05 - fix Segfault (Thanks to Jérémie Andréi)
Nelson Murilo, nmurilo@gmail.com
*/
#include <stdio.h>
#if __FreeBSD__ > 9
int main (void){ fprintf(stderr,"Unsupported operating system\n"); return 1; }
#else
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <utmp.h>
#include <time.h>
#include <sys/time.h>
#include <sys/file.h>
#ifdef SOLARIS2
#include <fcntl.h>
#endif
#include <stdlib.h>
#ifndef WTMP_FILENAME
#define WTMP_FILENAME "/var/log/wtmp"
#endif
void printit(int counter, long start, long end)
{
char buffer[30];
printf("%d deletion(s) between ", counter);
strncpy(buffer, ctime( (time_t *) &start), 30);
buffer[24]='\0';
printf("%s and %s", buffer, ctime( (time_t *) &end));
}
int main(int argc, char* argv[]) {
int filehandle;
struct utmp utmp_ent;
struct timeval mytime;
struct timezone dummy;
long start_time, act_time;
int del_counter, t_del;
char wtmpfile[128];
del_counter=t_del=0;
start_time=0;
gettimeofday(&mytime, &dummy);
act_time=mytime.tv_sec;
wtmpfile[127]='\0';
strncpy(wtmpfile, WTMP_FILENAME, 127);
if ( argc == 3 && !memcmp("-f", argv[1], 2) && *argv[2] && strlen(argv[2])<127)
memcpy(wtmpfile, argv[2], strlen(argv[2])+1);
if ((filehandle=open(wtmpfile,O_RDONLY)) < 0) {
fprintf(stderr, "unable to open wtmp file %s\n", wtmpfile);
return(2);
}
while (read (filehandle, (char *) &utmp_ent, sizeof (struct utmp)) > 0) {
if (utmp_ent.ut_time == 0)
del_counter++;
else {
if (del_counter) {
printit(del_counter, start_time,
utmp_ent.ut_time);
t_del++;
del_counter=0;
}
start_time=utmp_ent.ut_time;
}
}
close(filehandle);
if (del_counter)
printit(del_counter, start_time, act_time);
exit(t_del+del_counter > 0); // exit codes should be 0..255
}
#endif
|
