关键字:bluetooth 蓝牙协议 HCI剖析 HCI概述 HCI笔记 LMP L2CAP SDP RFCOMM
作者:zhongjun
本着互相学习的目的,来分享此一系列的文章,欢迎转载,请注明作者,尊重版权,谢谢
文章有不当处请指正,共同学习
此系列目前这样打算:
LMP剖析 + 模拟源码:
HCI剖析 + 模拟源码:
L2CAP剖析 + 模拟源码
SDP剖析 + 模拟源码(未完成)
rfcomm剖析 + 模拟源码(未完成)
另外可以从蓝牙栏目访问我的CSDN:http://blog.csdn.net/XiaoXiaoPengBo/article/category/5998687
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华丽分割线,进入正题
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一,部分代码没有完成,只是模拟一个面向连接的从建立到断开的过程,另外,L2CAP的重点状态机和拆包重组没有模拟
bt_l2cap.h
/* * This file is part of the L2CAP protocal. * Data :20160510 * Author: zhongjun * */ #ifndef BT_L2CAP_H_H #define BT_L2CAP_H_H #include "bt_cfg.h" #ifdef DEBUG_BT_L2CAP #define DEBUG(x) {printf x;} #define BT_L2CAP_DEBUG(x) DEBUG(x) #else #define BT_L2CAP_DEBUG(x) #endif /* L2CAP CHANNEL */ #define L2CAP_SIG_CH 0x0001 #define L2CAP_CONLESS_CH 0x0002 /* L2CAP defaults */ #define L2CAP_DEFAULT_MTU 672 #define L2CAP_DEFAULT_FLUSH_TO 0xFFFF /* UPPER LAYER PSM */ #define SDP_PSM 0x0001 /* L2CAP command codes */ #define L2CAP_COMMAND_REJ 0x01 #define L2CAP_CONN_REQ 0x02 #define L2CAP_CONN_RSP 0x03 #define L2CAP_CONF_REQ 0x04 #define L2CAP_CONF_RSP 0x05 #define L2CAP_DISCONN_REQ 0x06 #define L2CAP_DISCONN_RSP 0x07 #define L2CAP_ECHO_REQ 0x08 #define L2CAP_ECHO_RSP 0x09 #define L2CAP_INFO_REQ 0x0a #define L2CAP_INFO_RSP 0x0b /* connect result */ #define L2CAP_CR_SUCCESS 0x0000 #define L2CAP_CR_PEND 0x0001 #define L2CAP_CR_NOSUP_PSM 0x0002 #define L2CAP_CR_SEC_BLOCK 0x0003 #define L2CAP_CR_NO_RSR 0x0004 /* config result */ #define L2CAP_CONF_SUCCESS 0x0000 #define L2CAP_CONF_UNACCEPT 0x0001 #define L2CAP_CONF_REJECT 0x0002 #define L2CAP_CONF_UNKNOWN 0x0003 /* config option */ #define L2CAP_CONF_MTU 0x01 #define L2CAP_CONF_FLUSH_TO 0x02 #define L2CAP_CONF_QOS 0x03 #define L2CAP_CONF_RFC 0x04 #define L2CAP_CONF_RFC_MODE 0x04 #pragma pack(1) /* L2CAP structures hdr*/ typedef struct { uint16_t len; uint16_t cid; }L2CAP_PDU_HDR_Format; typedef struct { L2CAP_PDU_HDR_Format sig_hdr; uint8_t code; uint8_t ident; uint16_t len; }L2CAP_SIG_HDR_Format; /* L2CAP structures detail*/ typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t psm; uint16_t scid; }L2CAP_Con_Req; typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dst_cid; uint16_t src_cid; uint16_t result; uint16_t status; }L2CAP_Con_Rsp; typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dst_cid; uint16_t flags; uint8_t data[0]; }L2CAP_Conf_Req; typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t src_cid; uint16_t flags; uint16_t result; uint8_t data[0]; }L2CAP_Conf_Rsp; typedef struct { L2CAP_PDU_HDR_Format com_hdr; uint8_t data[0]; }L2CAP_Upper_Layer_data_Format; typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dcid; uint16_t scid; }L2CAP_Discon_req; typedef struct { L2CAP_SIG_HDR_Format com_hdr; uint16_t dcid; uint16_t scid; }L2CAP_Discon_rsp; #pragma pack() /* API */ /* send pdu */ int L2CAP_Send_SIG_Con_Req(uint8_t ident,uint16_t psm,uint16_t scid); int L2CAP_Send_SIG_Conf_Req(uint8_t ident,uint16_t dcid,uint16_t flags,uint8_t *conf_opt,uint8_t opt_len); int L2CAP_Send_Upper_Layer_data(uint16_t cid,uint8_t *data,uint16_t length); int L2CAP_Send_SIG_Discon_Req(uint8_t ident,uint16_t dcid,uint16_t scid); int L2CAP_Send_PDU(uint8_t *PDU,uint32_t length); /* reve pdu */ int L2CAP_Parse_PDU(uint8_t *PDU,uint32_t length); int L2CAP_Parse_SIG_Con_Rsp_PDU(uint8_t *PDU,uint32_t length); int L2CAP_Parse_SIG_Conf_Rsp_PDU(uint8_t *PDU,uint32_t length); int L2CAP_Parse_SIG_Discon_Rsp_PDU(uint8_t *PDU,uint32_t length); #endif
bt_l2cap.c
#include "bt_l2cap.h" int L2CAP_Send_SIG_Con_Req(uint8_t ident,uint16_t psm,uint16_t scid) { L2CAP_Con_Req PDU; PDU.com_hdr.sig_hdr.cid = L2CAP_SIG_CH; PDU.com_hdr.sig_hdr.len = sizeof(L2CAP_Con_Req) - sizeof(L2CAP_PDU_HDR_Format); PDU.com_hdr.code = L2CAP_CONN_REQ; PDU.com_hdr.ident = ident; PDU.com_hdr.len = sizeof(L2CAP_Con_Req) - sizeof(L2CAP_SIG_HDR_Format); PDU.psm = psm; PDU.scid = scid; L2CAP_Send_PDU((uint8_t *)&PDU,sizeof(L2CAP_Con_Req)); } int L2CAP_Send_SIG_Conf_Req(uint8_t ident,uint16_t dcid,uint16_t flags,uint8_t *conf_opt,uint8_t opt_len) { L2CAP_Conf_Req *PDU = (L2CAP_Conf_Req *)malloc(sizeof(L2CAP_Conf_Req) + opt_len); (PDU->com_hdr).sig_hdr.cid = L2CAP_SIG_CH; (PDU->com_hdr).sig_hdr.len = sizeof(L2CAP_Conf_Req) - sizeof(L2CAP_PDU_HDR_Format) + opt_len; (PDU->com_hdr).code = L2CAP_CONF_REQ; (PDU->com_hdr).ident = ident; (PDU->com_hdr).len = sizeof(L2CAP_Conf_Req) - sizeof(L2CAP_SIG_HDR_Format) + opt_len; PDU->dst_cid = dcid; PDU->flags = flags; memcpy(PDU->data,conf_opt,opt_len); L2CAP_Send_PDU(PDU,sizeof(L2CAP_Conf_Req) + opt_len); } int L2CAP_Send_Upper_Layer_data(uint16_t cid,uint8_t *data,uint16_t length) { L2CAP_Upper_Layer_data_Format *PDU = (L2CAP_Upper_Layer_data_Format *)malloc(sizeof(L2CAP_Upper_Layer_data_Format) + length); (PDU->com_hdr).cid = cid; (PDU->com_hdr).len = sizeof(L2CAP_Upper_Layer_data_Format) + length; memcpy(PDU->data,data,length); L2CAP_Send_PDU(PDU,sizeof(L2CAP_Upper_Layer_data_Format) + length); } int L2CAP_Send_SIG_Discon_Req(uint8_t ident,uint16_t dcid,uint16_t scid) { L2CAP_Discon_req PDU; PDU.com_hdr.sig_hdr.cid = L2CAP_SIG_CH; PDU.com_hdr.sig_hdr.len = sizeof(L2CAP_Discon_req) - sizeof(L2CAP_PDU_HDR_Format); PDU.com_hdr.code = L2CAP_DISCONN_REQ; PDU.com_hdr.ident = ident; PDU.com_hdr.len = sizeof(L2CAP_Con_Req) - sizeof(L2CAP_SIG_HDR_Format); PDU.dcid = dcid; PDU.scid = scid; L2CAP_Send_PDU((uint8_t *)&PDU,sizeof(L2CAP_Con_Req)); } int L2CAP_Send_PDU(uint8_t *PDU,uint32_t length) { int index = 0; BT_L2CAP_DEBUG((" >> Send L2CAP REQ PDU:")); for(index = 0; index < length; index++) { BT_L2CAP_DEBUG(("0x%02x ",PDU[index])); } BT_L2CAP_DEBUG(("\n")); } int L2CAP_Parse_PDU(uint8_t *PDU,uint32_t length) { L2CAP_PDU_HDR_Format *TMP_PDU = (L2CAP_PDU_HDR_Format *)PDU; if((TMP_PDU->cid) == L2CAP_SIG_CH) { uint8_t tmp_code; L2CAP_SIG_HDR_Format *pdu = (L2CAP_SIG_HDR_Format *)PDU; BT_L2CAP_DEBUG(("SIG PDU\n")); tmp_code = pdu->code; switch(tmp_code) { case L2CAP_CONN_RSP: { BT_L2CAP_DEBUG(("L2CAP_CONN_RSP\n")); L2CAP_Parse_SIG_Con_Rsp_PDU(PDU,length); break; } case L2CAP_CONF_RSP: { BT_L2CAP_DEBUG(("L2CAP_CONF_RSP\n")); L2CAP_Parse_SIG_Conf_Rsp_PDU(PDU,length); break; } case L2CAP_DISCONN_RSP: { BT_L2CAP_DEBUG(("L2CAP_DISCONN_RSP\n")); L2CAP_Parse_SIG_Discon_Rsp_PDU(PDU,length); break; } default: { break; } } } else { //TODO } } int L2CAP_Parse_SIG_Con_Rsp_PDU(uint8_t *PDU,uint32_t length) { L2CAP_Con_Rsp *tmp_pdu = (L2CAP_Con_Rsp *)PDU; if(tmp_pdu->result == L2CAP_CR_SUCCESS) { BT_L2CAP_DEBUG(("connect successful\n")); } else if(tmp_pdu->result == L2CAP_CR_PEND) { BT_L2CAP_DEBUG(("connect pending\n")); } } int L2CAP_Parse_SIG_Conf_Rsp_PDU(uint8_t *PDU,uint32_t length) { L2CAP_Conf_Rsp *tmp_pdu = (L2CAP_Conf_Rsp *)PDU; if(tmp_pdu->result == L2CAP_CONF_SUCCESS) { BT_L2CAP_DEBUG(("config successful\n")); } else if(tmp_pdu->result == L2CAP_CONF_UNACCEPT) { BT_L2CAP_DEBUG(("config unaccept\n")); } } int L2CAP_Parse_SIG_Discon_Rsp_PDU(uint8_t *PDU,uint32_t length) { }
bt_cfg.h
#ifndef BT_LMP_CFG_H #define BT_LMP_CFG_H #include <stdlib.h> #include <stdio.h> #include <string.h> #define DEBUG_BT_L2CAP typedef unsigned char uint8_t; typedef unsigned short uint16_t; typedef unsigned int uint32_t; typedef char int8_t; typedef short int16_t; typedef int int32_t; #undef NULL #if defined(__cplusplus) #define NULL 0 #else #define NULL ((void *)0) #endif #endif
main.c
#include <stdio.h> #include "bt_l2cap.h" int main() { uint8_t con_rsp_pdu[] = {0x0C,0x00,0x01,0x00,0x03,0x79,0x08,0x00,0x06,0x08,0x40,0x00,0x00,0x00,0x00,0x00}; uint8_t conf_option[] = {0x01,0x02,0xF4,0x01,0x02,0x02,0xFF,0xFF}; uint8_t conf_rsp_pdu[] = {0x0E,0x00,0x01,0x00,0x05,0x7A,0x0A,0x00,0x40,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0xF4,0x01}; uint8_t upper_layer_data[] = {0x1,0x1,0x1,0x1,0x1,0x1}; L2CAP_Send_SIG_Con_Req(0x79,SDP_PSM,0x40); L2CAP_Parse_PDU(con_rsp_pdu,sizeof(con_rsp_pdu)); L2CAP_Send_SIG_Conf_Req(0x79,0x0806,0x0,conf_option,sizeof(conf_option)); L2CAP_Parse_PDU(conf_rsp_pdu,sizeof(conf_rsp_pdu)); L2CAP_Send_Upper_Layer_data(0x40,upper_layer_data,sizeof(upper_layer_data)); L2CAP_Send_SIG_Discon_Req(0x79,0x40,0x0806); }
时间: 2024-11-06 15:14:56