PAL.C.T MINI SHELL
#!/usr/bin/stap
# May also need --skip-badvars
global activity_time, activity_log
/* Concatenate head and tail, to a max of @num chars, preferring to keep the tail
(as if it were a recent history buffer). */
function strcattail:string(head:string,tail:string,num:long) %{ /* pure */
unsigned taillen = strlen(STAP_ARG_tail);
unsigned headlen = strlen(STAP_ARG_head);
unsigned maxlen = STAP_ARG_num < MAXSTRINGLEN ? STAP_ARG_num : MAXSTRINGLEN;
unsigned headkeep = min(maxlen-taillen,headlen);
unsigned headdrop = headlen-headkeep;
if (headkeep)
strlcpy (STAP_RETVALUE, &STAP_ARG_head[headdrop], headkeep+1); /* includes \0 */
strlcat (STAP_RETVALUE, STAP_ARG_tail, maxlen);
%}
probe kernel.function("tty_audit_add_data") {
major=$tty->driver->major;
minor=$tty->driver->minor_start + $tty->index;
try { pgrp=$tty->pgrp %( kernel_v >= "2.6.24" %? ->numbers[0]->nr %: %) } catch { }
data=kernel_string_n($data,$size);
uid=uid()
activity_time[major,minor,pgrp,uid] = gettimeofday_s();
activity_log[major,minor,pgrp,uid]
= strcattail(activity_log[major,minor,pgrp,uid],data,40);
}
probe timer.s(3) {
ansi_clear_screen ()
printf("(%3s,%2s,%5s,%5s)\n", "maj","min","pgrp","uid");
foreach ([x,y,z,u] in activity_time-) {
printf("(%3d,%3d,%5d,%5d) %s\n", x,y,z,u,
text_str(activity_log[x,y,z,u]))
}
/* delete last record, if older than 60 seconds */
if (activity_time[x,y,z,u]+60 < gettimeofday_s()) {
delete activity_time[x,y,z,u]
delete activity_log[x,y,z,u]
}
}
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