分析BACnet协议栈2.doc

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1、mstpscap.c这个文件主要实现从串口上抓取MS/TP协议上的packet功能。测试时的格式为:mstsnap[serial][baud][network]默认参数是串口/dev/ttyUSBO.波特率赴38400,ethO：#include#include#inelude#include#ineluderOSspecificinclude*/#include“net.

2、h"#include"timer.h”rlocalincludes7#include”bytes.h”#includeHrs485.hM#include"crc.h"#include"mstp.h”#include”dlmslp.h”#includeMmstptext.hw#include"bacint.h"/"@filelinux/mstpsnap.cExampleapplicationtestingBACnetMS/TPonLinux.*/#ifndefmax#definemax(a,b)({(a)

3、>(b))?(a):(b))#definemin(a,b)(((a)<(b))?(a):(b))#endifrlocalportdata-sharedwithRS-485*/staticvolatilestructmstp_port_struct_tMSTP_Port;/*buffersneededbymstpportstruct*/staticuint8JRxBuffer[MAX_MPDU];staticuint8JTxBuffer[MAX_MPDU];staticuint16_tTimer_Sile

4、nce(void){uint32jdelta_time=0;deltajime=timer_milliseconds仃IMERSILENCE);if(deltajime>OxFFFF){deltajime=OxFFFF;}return(uint16J)deltajime;}staticvoidTimer_Silence_Reset(void){timer_reset仃IMER一SILENCE);rfunctionsusedbytheMS/TPstatemachinetoputorgetdata7uint

5、16JMSTP_Put_Receive(volatilestructmstp_port_struct」*mstp_port){(void)mstp_port;return0;}/*fortheMS/TPstatemachinetouseforgettingdatatosend*/rReturn:amountofPDUdata7uint16_tMSTP_Get_Send(volatilestructmstp_port_struct_t*mstp_port,unsignedtimeout){/*millis

6、econdstowaitforapacket*/(void)mstp__port;(void)timeout;return0;}uint16JMSTP_Get_Reply(volatilestructmstp_port_struct_t*mstp^port,unsignedtimeout){/*millisecondstowaitforapacket7(void)mstp_port;(void)timeout;return0;}staticintnetwork」nit(constchar*name,in

7、tprotocol){rchecktoseeifwearebeingrunasroot*/if(getuid()!=0){〃函数返回•个调用程序的宾实川户ID.般来说，这个函数祁於会调用成功的。getuid=0农示root用fprintffstderr,'RequiresrootprivelegesAn");return-1;}intsockfd=socket(PF_PACKET,SOCK_RAWthtons(protocol));//得到原始的IP包，htons得到网络字冲序(人瑤模式)网络上统使用大

8、瑞模式传输if(sockfd==-1){perror(HUnabletocreatesocket'*);returnsockfd;}structifreqifr;〃获取IP地址和MAC地址memset(&ifr,0,sizeof(ifr));stmcpy(ifr.ifr_name,name,strlen(name));if(ioctl(sockfd,SIOCGIFINDEX,&ifr)==-1){//获取并打印网冃也址perror(uUna