mirror of
https://git.kernel.org/pub/scm/bluetooth/bluez.git
synced 2024-12-14 06:25:08 +08:00
240 lines
5.0 KiB
C
240 lines
5.0 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2004-2011 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "parser.h"
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#define PPP_U8(frm) (get_u8(frm))
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#define PPP_U16(frm) (btohs(htons(get_u16(frm))))
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#define PPP_U32(frm) (btohl(htonl(get_u32(frm))))
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static int ppp_traffic = 0;
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static unsigned char ppp_magic1[] = { 0x7e, 0xff, 0x03, 0xc0, 0x21 };
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static unsigned char ppp_magic2[] = { 0x7e, 0xff, 0x7d, 0x23, 0xc0, 0x21 };
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static unsigned char ppp_magic3[] = { 0x7e, 0x7d, 0xdf, 0x7d, 0x23, 0xc0, 0x21 };
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static inline int check_for_ppp_traffic(unsigned char *data, int size)
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{
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unsigned int i;
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for (i = 0; i < size - sizeof(ppp_magic1); i++)
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if (!memcmp(data + i, ppp_magic1, sizeof(ppp_magic1))) {
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ppp_traffic = 1;
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return i;
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}
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for (i = 0; i < size - sizeof(ppp_magic2); i++)
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if (!memcmp(data + i, ppp_magic2, sizeof(ppp_magic2))) {
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ppp_traffic = 1;
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return i;
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}
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for (i = 0; i < size - sizeof(ppp_magic3); i++)
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if (!memcmp(data + i, ppp_magic3, sizeof(ppp_magic3))) {
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ppp_traffic = 1;
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return i;
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}
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return -1;
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}
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static inline char *dir2str(uint8_t in)
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{
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return in ? "DCE" : "DTE";
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}
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static inline char *proto2str(uint16_t proto)
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{
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switch (proto) {
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case 0x0001:
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return "Padding Protocol";
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case 0x0021:
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return "IP";
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case 0x8021:
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return "IP Control Protocol";
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case 0x80fd:
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return "Compression Control Protocol";
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case 0xc021:
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return "Link Control Protocol";
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case 0xc023:
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return "Password Authentication Protocol";
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case 0xc025:
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return "Link Quality Report";
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case 0xc223:
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return "Challenge Handshake Authentication Protocol";
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default:
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return "Unknown Protocol";
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}
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}
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static void hdlc_dump(int level, struct frame *frm)
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{
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uint8_t addr = get_u8(frm);
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uint8_t ctrl = get_u8(frm);
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uint16_t fcs, proto;
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fcs = bt_get_unaligned((uint16_t *) (frm->ptr + frm->len - 2));
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frm->len -= 2;
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p_indent(level, frm);
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if (addr != 0xff || ctrl != 0x03) {
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frm->ptr -= 2;
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frm->len += 2;
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printf("HDLC: %s: len %d fcs 0x%04x\n",
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dir2str(frm->in), frm->len, fcs);
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} else
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printf("HDLC: %s: addr 0x%02x ctrl 0x%02x len %d fcs 0x%04x\n",
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dir2str(frm->in), addr, ctrl, frm->len, fcs);
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if (*((uint8_t *) frm->ptr) & 0x80)
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proto = get_u16(frm);
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else
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proto = get_u8(frm);
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p_indent(level + 1, frm);
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printf("PPP: %s (0x%04x): len %d\n", proto2str(proto), proto, frm->len);
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raw_dump(level + 1, frm);
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}
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static inline void unslip_frame(int level, struct frame *frm, int len)
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{
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struct frame msg;
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unsigned char *data, *ptr;
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int i, p = 0;
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data = malloc(len * 2);
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if (!data)
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return;
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ptr = frm->ptr;
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for (i = 0; i < len; i++) {
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if (ptr[i] == 0x7d) {
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data[p++] = ptr[i + 1] ^ 0x20;
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i++;
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} else
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data[p++] = ptr[i];
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}
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memset(&msg, 0, sizeof(msg));
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msg.data = data;
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msg.data_len = len * 2;
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msg.ptr = msg.data;
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msg.len = p;
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msg.in = frm->in;
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msg.ts = frm->ts;
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msg.handle = frm->handle;
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msg.cid = frm->cid;
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hdlc_dump(level, &msg);
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free(data);
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}
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void ppp_dump(int level, struct frame *frm)
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{
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void *ptr, *end;
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int err, len, pos = 0;
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if (frm->pppdump_fd > fileno(stderr)) {
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unsigned char id;
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uint16_t len = htons(frm->len);
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uint32_t ts = htonl(frm->ts.tv_sec & 0xffffffff);
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id = 0x07;
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err = write(frm->pppdump_fd, &id, 1);
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if (err < 0)
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return;
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err = write(frm->pppdump_fd, &ts, 4);
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if (err < 0)
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return;
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id = frm->in ? 0x02 : 0x01;
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err = write(frm->pppdump_fd, &id, 1);
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if (err < 0)
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return;
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err = write(frm->pppdump_fd, &len, 2);
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if (err < 0)
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return;
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err = write(frm->pppdump_fd, frm->ptr, frm->len);
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if (err < 0)
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return;
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}
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if (!ppp_traffic) {
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pos = check_for_ppp_traffic(frm->ptr, frm->len);
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if (pos < 0) {
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raw_dump(level, frm);
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return;
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}
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if (pos > 0) {
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raw_ndump(level, frm, pos);
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frm->ptr += pos;
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frm->len -= pos;
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}
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}
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frm = add_frame(frm);
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while (frm->len > 0) {
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ptr = memchr(frm->ptr, 0x7e, frm->len);
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if (!ptr)
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break;
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if (frm->ptr != ptr) {
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frm->len -= (ptr - frm->ptr);
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frm->ptr = ptr;
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}
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end = memchr(frm->ptr + 1, 0x7e, frm->len - 1);
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if (!end)
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break;
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len = end - ptr - 1;
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frm->ptr++;
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frm->len--;
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if (len > 0) {
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unslip_frame(level, frm, len);
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frm->ptr += len;
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frm->len -= len;
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}
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}
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}
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