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Sample probe.
To build, edit the path in buildit and the addresses in struct dtr_probes
in dtr.c Then "source buildit"
This is a translation of on an old dtr probe:
# shellsnoop.probe - snoop shell execution as it occurs.
# clone of dtrace shellsnoop example
global {
long @pids[long];
}
probe do_execve:entry {
char __user *vstr;
char str[256];
int len;
/* watch shells only */
/* FIXME: detect more shells, like csh, tcsh, zsh */
if (!strcmp(current->comm,"bash") || !strcmp(current->comm,"sh") || !strcmp(current->comm, "zsh")
|| !strcmp(current->comm, "tcsh") || !strcmp(current->comm, "pdksh"))
{
dlog ("%d\t%d\t%d\t%s ", current->uid, current->pid, current->parent->pid, filename);
@pids[current->pid] = 1;
/* print out argv, ignoring argv[0] */
if (argv) argv++;
while (argv != NULL)
{
if (get_user (vstr, argv))
break;
if (!vstr)
break;
len = dtr_strncpy_from_user(str, vstr, 256);
str[len] = 0;
printk ("%s ", str);
argv++;
}
printk ("\n");
}
}
# use filp_open because copy_from_user not needed there
probe filp_open:entry {
if (@pids[current->pid])
dlog ("%d\t%d\t%s\tO %s\n", current->pid, current->parent->pid, current->comm, filename);
}
probe sys_read:entry {
if (@pids[current->pid])
dlog ("%d\t%d\t%s\tR %d\n", current->pid, current->parent->pid, current->comm, fd);
}
probe sys_write:entry {
size_t len;
char str[256];
if (@pids[current->pid])
{
if (count < 64) len = count;
else len = 64;
if (len = dtr_strncpy_from_user(str, buf, len)) {
str[len] = 0;
dlog ("%d\t%d\t%s\tW %s\n", current->pid, current->parent->pid, current->comm, str);
}
}
}
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