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//#define STP_RELAYFS
#define STP_NUM_STRINGS 1
#define STP_STRING_SIZE 8192
#include "runtime.h"
#define VALUE_TYPE INT64
#define KEY1_TYPE INT64
#include "map-gen.c"
#define VALUE_TYPE STRING
#define KEY1_TYPE INT64
#include "map-gen.c"
#include "map.c"
#include "copy.c"
#include "probes.c"
MODULE_DESCRIPTION("SystemTap probe: shellsnoop");
MODULE_AUTHOR("Martin Hunt <hunt@redhat.com>");
MAP pids, arglist ;
void _stp_copy_argv_from_user (MAP list, char __user *__user *argv)
{
char str[128];
char __user *vstr;
int len, i = 0;
if (argv)
argv++;
while (argv != NULL) {
if (get_user (vstr, argv))
break;
if (vstr == NULL)
break;
len = _stp_strncpy_from_user(str, vstr, 128);
str[len] = 0;
_stp_map_set_is (list, i++, str);
argv++;
}
}
int inst_do_execve (char * filename, char __user *__user *argv, char __user *__user *envp, struct pt_regs * regs)
{
struct map_node *ptr;
/* 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"))
{
_stp_printf ("%d\t%d\t%d\t%s ", current->uid, current->pid, current->parent->pid, filename);
_stp_map_set_ii (pids, current->pid, 1);
_stp_map_clear (arglist);
_stp_copy_argv_from_user (arglist, argv);
foreach (arglist, ptr)
_stp_printf ("%s ", _stp_get_str(ptr));
_stp_print("\n");
_stp_print_flush();
}
jprobe_return();
return 0;
}
struct file * inst_filp_open (const char * filename, int flags, int mode)
{
if (_stp_map_get_ii (pids, current->pid)) {
_stp_printf ("%d\t%d\t%s\tO %s\n", current->pid, current->parent->pid, current->comm, filename);
_stp_print_flush();
}
jprobe_return();
return 0;
}
asmlinkage ssize_t inst_sys_read (unsigned int fd, char __user * buf, size_t count)
{
if (_stp_map_get_ii (pids, current->pid)) {
_stp_printf ("%d\t%d\t%s\tR %d\n", current->pid, current->parent->pid, current->comm, fd);
_stp_print_flush();
}
jprobe_return();
return 0;
}
asmlinkage ssize_t inst_sys_write (unsigned int fd, const char __user * buf, size_t count)
{
if (_stp_map_get_ii (pids, current->pid)) {
String str = _stp_string_init (0);
_stp_string_from_user(str, buf, count);
_stp_printf ("%d\t%d\t%s\tW %s", current->pid, current->parent->pid,
current->comm, _stp_string_ptr(str));
_stp_print_flush();
}
jprobe_return();
return 0;
}
static struct jprobe stp_probes[] = {
{
.kp.addr = (kprobe_opcode_t *)"do_execve",
.entry = (kprobe_opcode_t *) inst_do_execve
},
{
.kp.addr = (kprobe_opcode_t *)"filp_open",
.entry = (kprobe_opcode_t *) inst_filp_open
},
{
.kp.addr = (kprobe_opcode_t *)"sys_read",
.entry = (kprobe_opcode_t *) inst_sys_read
},
{
.kp.addr = (kprobe_opcode_t *)"sys_write",
.entry = (kprobe_opcode_t *) inst_sys_write
},
};
#define MAX_STP_ROUTINE (sizeof(stp_probes)/sizeof(struct jprobe))
int probe_start(void)
{
int ret;
/* now initialize any data or variables */
pids = _stp_map_new_ii(10000);
arglist = _stp_map_new_is (10);
/* now we are ready to enable the probes */
ret = _stp_register_jprobes (stp_probes, MAX_STP_ROUTINE);
if (ret < 0) {
_stp_map_del (pids);
_stp_map_del (arglist);
return ret;
}
_stp_printf("instrumentation is enabled... %s\n", __this_module.name);
_stp_print_flush();
return ret;
}
void probe_exit (void)
{
_stp_unregister_jprobes (stp_probes, MAX_STP_ROUTINE);
_stp_map_del (pids);
_stp_map_del (arglist);
_stp_printf("\nDropped %d packets\n", atomic_read(&_stp_transport_failures));
_stp_print_flush();
}
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