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decode_icq.c
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decode_icq.c
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/*
* decode_icq.c
*
* ICQ (note - ICQ2000 is actually AIM).
*
* Copyright (c) 2000 Dug Song <[email protected]>
*
* $Id: decode_icq.c,v 1.7 2001/03/15 08:33:00 dugsong Exp $
*/
#include "config.h"
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include "buf.h"
#include "decode.h"
#define ICQ2_UIN_OFFSET 6
#define ICQ2_CMD_OFFSET 2
#define ICQ2_PASS_OFFSET 16
#define ICQ5_UIN_OFFSET 6
#define ICQ5_CMD_OFFSET 14
#define ICQ5_CKSUM_OFFSET 20
#define ICQ5_PASS_OFFSET 34
const u_char icq5_table [] = {
0x59, 0x60, 0x37, 0x6B, 0x65, 0x62, 0x46, 0x48, 0x53, 0x61, 0x4C,
0x59, 0x60, 0x57, 0x5B, 0x3D, 0x5E, 0x34, 0x6D, 0x36, 0x50, 0x3F,
0x6F, 0x67, 0x53, 0x61, 0x4C, 0x59, 0x40, 0x47, 0x63, 0x39, 0x50,
0x5F, 0x5F, 0x3F, 0x6F, 0x47, 0x43, 0x69, 0x48, 0x33, 0x31, 0x64,
0x35, 0x5A, 0x4A, 0x42, 0x56, 0x40, 0x67, 0x53, 0x41, 0x07, 0x6C,
0x49, 0x58, 0x3B, 0x4D, 0x46, 0x68, 0x43, 0x69, 0x48, 0x33, 0x31,
0x44, 0x65, 0x62, 0x46, 0x48, 0x53, 0x41, 0x07, 0x6C, 0x69, 0x48,
0x33, 0x51, 0x54, 0x5D, 0x4E, 0x6C, 0x49, 0x38, 0x4B, 0x55, 0x4A,
0x62, 0x46, 0x48, 0x33, 0x51, 0x34, 0x6D, 0x36, 0x50, 0x5F, 0x5F,
0x5F, 0x3F, 0x6F, 0x47, 0x63, 0x59, 0x40, 0x67, 0x33, 0x31, 0x64,
0x35, 0x5A, 0x6A, 0x52, 0x6E, 0x3C, 0x51, 0x34, 0x6D, 0x36, 0x50,
0x5F, 0x5F, 0x3F, 0x4F, 0x37, 0x4B, 0x35, 0x5A, 0x4A, 0x62, 0x66,
0x58, 0x3B, 0x4D, 0x66, 0x58, 0x5B, 0x5D, 0x4E, 0x6C, 0x49, 0x58,
0x3B, 0x4D, 0x66, 0x58, 0x3B, 0x4D, 0x46, 0x48, 0x53, 0x61, 0x4C,
0x59, 0x40, 0x67, 0x33, 0x31, 0x64, 0x55, 0x6A, 0x32, 0x3E, 0x44,
0x45, 0x52, 0x6E, 0x3C, 0x31, 0x64, 0x55, 0x6A, 0x52, 0x4E, 0x6C,
0x69, 0x48, 0x53, 0x61, 0x4C, 0x39, 0x30, 0x6F, 0x47, 0x63, 0x59,
0x60, 0x57, 0x5B, 0x3D, 0x3E, 0x64, 0x35, 0x3A, 0x3A, 0x5A, 0x6A,
0x52, 0x4E, 0x6C, 0x69, 0x48, 0x53, 0x61, 0x6C, 0x49, 0x58, 0x3B,
0x4D, 0x46, 0x68, 0x63, 0x39, 0x50, 0x5F, 0x5F, 0x3F, 0x6F, 0x67,
0x53, 0x41, 0x25, 0x41, 0x3C, 0x51, 0x54, 0x3D, 0x5E, 0x54, 0x5D,
0x4E, 0x4C, 0x39, 0x50, 0x5F, 0x5F, 0x5F, 0x3F, 0x6F, 0x47, 0x43,
0x69, 0x48, 0x33, 0x51, 0x54, 0x5D, 0x6E, 0x3C, 0x31, 0x64, 0x35,
0x5A, 0x00, 0x00
};
int
decode_icq(u_char *buf, int len, u_char *obuf, int olen)
{
struct buf inbuf, outbuf;
u_short version, cmd;
u_int32_t uin;
u_char *p;
buf_init(&inbuf, buf, len);
buf_init(&outbuf, obuf, olen);
if (buf_get(&inbuf, &version, sizeof(version)) != sizeof(version))
return (0);
version = pletohs(&version);
switch (version) {
case 2:
if (buf_seek(&inbuf, ICQ2_CMD_OFFSET, SEEK_SET) < 0)
return (0);
if (buf_get(&inbuf, &cmd, sizeof(cmd)) != sizeof(cmd))
return (0);
if ((cmd = pletohs(&cmd)) != 1000)
return (0);
if (buf_seek(&inbuf, ICQ2_UIN_OFFSET, SEEK_SET) < 0)
return (0);
if (buf_get(&inbuf, &uin, sizeof(uin)) != sizeof(uin))
return (0);
uin = pletohl(&uin);
if (buf_seek(&inbuf, ICQ2_PASS_OFFSET, SEEK_SET) < 0)
return (0);
break;
case 5:
{
u_int32_t a1, a2, a3, a4, a5, c, key, i, k;
if (buf_seek(&inbuf, ICQ5_CKSUM_OFFSET, SEEK_SET) < 0)
return (0);
if (buf_get(&inbuf, &c, sizeof(c)) != sizeof(c))
return (0);
c = pletohl(&c);
a1 = c & 0x0001f000; a1 = a1 >> 0x0c;
a2 = c & 0x07c007c0; a2 = a2 >> 0x01;
a3 = c & 0x003e0001; a3 = a3 << 0x0a;
a4 = c & 0xf8000000; a4 = a4 >> 0x10;
a5 = c & 0x0000083e; a5 = a5 << 0x0f;
key = len * 0x68656C6C;
key += a1 + a2 + a3 + a4 + a5;
p = inbuf.base;
for (i = 0x0a; i < inbuf.end + 3; i += 4) {
k = key + icq5_table[i & 0xff];
if (i != 0x16) {
p[i] ^= (u_char)(k & 0xff);
p[i + 1] ^= (u_char)((k & 0xff00) >> 8);
}
if (i != 0x12) {
p[i + 2] ^= (u_char)((k & 0xff0000) >> 16);
p[i + 3] ^= (u_char)((k & 0xff000000) >> 24);
}
}
if (buf_seek(&inbuf, ICQ5_CMD_OFFSET, SEEK_SET) < 0)
return (0);
if (buf_get(&inbuf, &cmd, sizeof(cmd)) != sizeof(cmd))
return (0);
if ((cmd = pletohs(&cmd)) != 1000)
return (0);
if (buf_seek(&inbuf, ICQ5_UIN_OFFSET, SEEK_SET) < 0)
return (0);
if (buf_get(&inbuf, &uin, sizeof(uin)) != sizeof(uin))
return (0);
uin = pletohl(&uin);
if (buf_seek(&inbuf, ICQ5_PASS_OFFSET, SEEK_SET) < 0)
return (0);
}
break;
default:
return (0);
}
buf_putf(&outbuf, "%d\n%.*s\n", uin, buf_len(&inbuf), buf_ptr(&inbuf));
buf_end(&outbuf);
return (buf_len(&outbuf));
}