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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2004-2011 Marcel Holtmann <marcel@holtmann.org>
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "parser.h"
#define PPP_U8(frm) (get_u8(frm))
#define PPP_U16(frm) (btohs(htons(get_u16(frm))))
#define PPP_U32(frm) (btohl(htonl(get_u32(frm))))
static int ppp_traffic = 0;
static unsigned char ppp_magic1[] = { 0x7e, 0xff, 0x03, 0xc0, 0x21 };
static unsigned char ppp_magic2[] = { 0x7e, 0xff, 0x7d, 0x23, 0xc0, 0x21 };
static unsigned char ppp_magic3[] = { 0x7e, 0x7d, 0xdf, 0x7d, 0x23, 0xc0, 0x21 };
static inline int check_for_ppp_traffic(unsigned char *data, int size)
{
unsigned int i;
for (i = 0; i < size - sizeof(ppp_magic1); i++)
if (!memcmp(data + i, ppp_magic1, sizeof(ppp_magic1))) {
ppp_traffic = 1;
return i;
}
for (i = 0; i < size - sizeof(ppp_magic2); i++)
if (!memcmp(data + i, ppp_magic2, sizeof(ppp_magic2))) {
ppp_traffic = 1;
return i;
}
for (i = 0; i < size - sizeof(ppp_magic3); i++)
if (!memcmp(data + i, ppp_magic3, sizeof(ppp_magic3))) {
ppp_traffic = 1;
return i;
}
return -1;
}
static inline char *dir2str(uint8_t in)
{
return in ? "DCE" : "DTE";
}
static inline char *proto2str(uint16_t proto)
{
switch (proto) {
case 0x0001:
return "Padding Protocol";
case 0x0021:
return "IP";
case 0x8021:
return "IP Control Protocol";
case 0x80fd:
return "Compression Control Protocol";
case 0xc021:
return "Link Control Protocol";
case 0xc023:
return "Password Authentication Protocol";
case 0xc025:
return "Link Quality Report";
case 0xc223:
return "Challenge Handshake Authentication Protocol";
default:
return "Unknown Protocol";
}
}
static void hdlc_dump(int level, struct frame *frm)
{
uint8_t addr = p_get_u8(frm);
uint8_t ctrl = p_get_u8(frm);
uint16_t fcs, proto;
fcs = get_unaligned((uint16_t *) (frm->ptr + frm->len - 2));
frm->len -= 2;
p_indent(level, frm);
if (addr != 0xff || ctrl != 0x03) {
frm->ptr -= 2;
frm->len += 2;
printf("HDLC: %s: len %d fcs 0x%04x\n",
dir2str(frm->in), frm->len, fcs);
} else
printf("HDLC: %s: addr 0x%02x ctrl 0x%02x len %d fcs 0x%04x\n",
dir2str(frm->in), addr, ctrl, frm->len, fcs);
if (*((uint8_t *) frm->ptr) & 0x80)
proto = p_get_u16(frm);
else
proto = p_get_u8(frm);
p_indent(level + 1, frm);
printf("PPP: %s (0x%04x): len %d\n", proto2str(proto), proto, frm->len);
raw_dump(level + 1, frm);
}
static inline void unslip_frame(int level, struct frame *frm, int len)
{
struct frame msg;
unsigned char *data, *ptr;
int i, p = 0;
data = malloc(len * 2);
if (!data)
return;
ptr = frm->ptr;
for (i = 0; i < len; i++) {
if (ptr[i] == 0x7d) {
data[p++] = ptr[i + 1] ^ 0x20;
i++;
} else
data[p++] = ptr[i];
}
memset(&msg, 0, sizeof(msg));
msg.data = data;
msg.data_len = len * 2;
msg.ptr = msg.data;
msg.len = p;
msg.in = frm->in;
msg.ts = frm->ts;
msg.handle = frm->handle;
msg.cid = frm->cid;
hdlc_dump(level, &msg);
free(data);
}
void ppp_dump(int level, struct frame *frm)
{
void *ptr, *end;
int err, len, pos = 0;
if (frm->pppdump_fd > fileno(stderr)) {
unsigned char id;
uint16_t len = htons(frm->len);
uint32_t ts = htonl(frm->ts.tv_sec & 0xffffffff);
id = 0x07;
err = write(frm->pppdump_fd, &id, 1);
if (err < 0)
return;
err = write(frm->pppdump_fd, &ts, 4);
if (err < 0)
return;
id = frm->in ? 0x02 : 0x01;
err = write(frm->pppdump_fd, &id, 1);
if (err < 0)
return;
err = write(frm->pppdump_fd, &len, 2);
if (err < 0)
return;
err = write(frm->pppdump_fd, frm->ptr, frm->len);
if (err < 0)
return;
}
if (!ppp_traffic) {
pos = check_for_ppp_traffic(frm->ptr, frm->len);
if (pos < 0) {
raw_dump(level, frm);
return;
}
if (pos > 0) {
raw_ndump(level, frm, pos);
frm->ptr += pos;
frm->len -= pos;
}
}
frm = add_frame(frm);
while (frm->len > 0) {
ptr = memchr(frm->ptr, 0x7e, frm->len);
if (!ptr)
break;
if (frm->ptr != ptr) {
frm->len -= (ptr - frm->ptr);
frm->ptr = ptr;
}
end = memchr(frm->ptr + 1, 0x7e, frm->len - 1);
if (!end)
break;
len = end - ptr - 1;
frm->ptr++;
frm->len--;
if (len > 0) {
unslip_frame(level, frm, len);
frm->ptr += len;
frm->len -= len;
}
}
}
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