【Loadrunner winsocket菜鸟实践四】如何玩转TCP/UDP请求，以及CRC8校验（终结版）
步骤1:新建CRC8.c文件，代码如下：
//CRC8 字节表
const unsigned char CRC8Table[]= {
0,94,188,226,97,63,221,131,194,156,126,32,163,253,31,65,
157,195,33,127,252,162,64,30, 95,1,227,189,62,96,130,220,
35,125,159,193,66,28,254,160,225,191,93,3,128,222,60,98,
190,224,2,92,223,129,99,61,124,34,192,158,29,67,161,255,
70,24,250,164,39,121,155,197,132,218,56,102,229,187,89,7,
219,133,103,57,186,228,6,88,25,71,165,251,120,38,196,154,
101,59,217,135,4,90,184,230,167,249,27,69,198,152,122,36,
248,166,68,26,153,199,37,123,58,100,134,216,91,5,231,185,
140,210,48,110,237,179,81,15,78,16,242,172,47,113,147,205,
17,79,173,243,112,46,204,146,211,141,111,49,178,236,14,80,
175,241,19,77,206,144,114,44,109,51,209,143,12,82,176,238,
50,108,142,208,83,13,239,177,240,174,76,18,145,207,45,115,
202,148,118,40,171,245,23,73,8,86,180,234,105,55,213,139,
87,9,235,181,54,104,138,212,149,203, 41,119,244,170,72,22,
233,183,85,11,136,214,52,106,43,117,151,201,74,20,246,168,
116,42,200,150,21,75,169,247,182,232,10,84,215,137,107,53
};
//CRC8 校验
unsigned char Checksum_CRC8(unsigned char *buf,int len)
{
unsigned char check = 0;
while(len--)
{
check = CRC8Table[check^(*buf++)];
}
free(buf);
return (check)&0x00ff;
}步骤2:创建一个send_buff.c文件:
//将10进制数字转2位的16进制字符串
char buffer_2 [1024];
char * inttohex_2(int aa)
{
sprintf(buffer_2, "%02lx", aa);
return (buffer_2);
}
//将10进制数字转4位的16进制字符串
char buffer_4 [1024];
char * inttohex_4(long aa)
{
sprintf(buffer_4, "%04lx", aa);
return (buffer_4);
}
//将10进制数字转8位的16进制字符串
char buffer_8 [1024];
char * inttohex_8(long aa)
{
sprintf(buffer_8, "%08lx", aa);
return (buffer_8);
}
//将10进制字符串转16进制
char result[1024];
char * toascii_16(char from[],int size)
{
int i,z,k;
char temp[1024];
z=0;
for(i=0;i步骤3：在loadrunner中引入调用代码：
#include "lrs.h"
#include "CRC8.c"
#include "send_buff.c"
char *IMEI_id;
char *ICCID_16;
vuser_init()
{
int rc;
lrs_startup(257);
rc=lrs_create_socket("socket6", "TCP", "RemoteHost=xxx.xxx.xxx.xxx:xxxx", LrsLastArg);
if (rc==0){
lr_output_message("Socket was successfully created ");
}else{
lr_output_message("An error occurred while creating the socket, Error Code: %d", rc);
return -1;
}
/*--------------------------生成初始化数据---------------------------------- */
/*--------------生成case公共号------------*/
//将10进制字符串转16进制字符串
caseID=lr_eval_string("868345031426596");
CASE_len=strlen(caseID);
lr_output_message("CASE_len>>>:%d",CASE_len);
case_id=toascii_sn_16(caseID,CASE_len);
lr_output_message("case_id>>>:%s",case_id);
/*--------------生成公共序号------------*/
IC_ID=lr_eval_string("89860zzzzzzzzzzzzzzz");
IC_ID_len=strlen(IC_ID);
lr_output_message("IC_ID_len>>>:%d",IC_ID_len);
IC_ID_16=toascii_16(IC_ID,IC_ID_len);
lr_output_message("IC_ID_16>>>:%s",IC_ID_16);
return 0;
}
#include "lrs.h"
Action()
{
char *Data;
int NumberOfBytes;
char buffer_1[2048]="010b0701c0";
char cacr8_values1[1024];
unsigned char * Hex_val_1;
unsigned char CRC8_1;
char * send_buffer_val;
typedef long time_t;
time_t t;
char timec[2048];
char *tmp;
int s;
/*----------------------------------------POST数据-------------------------------------------------*/
lr_start_transaction("post");
//组装版本号
strcat(buffer_1,inttohex_2(100));
lr_output_message(">>>>>>>>>>>>>>>Buffer01: %s",buffer_1);
//组装 case公共号
strcat(buffer_1,case_id);
lr_output_message(">>>>>>>>>>>>>>>Buffer02: %s",buffer_1);
//组装公共序号
strcat(buffer_1,IC_ID_16);
lr_output_message(">>>>>>>>>>>>>>>Buffer03: %s",buffer_1);
//组装10个数据包
strcat(buffer_1,inttohex_2(10));
lr_output_message(">>>>>>>>>>>>>>>Buffer04: %s",buffer_1);
for(s=0;s<10;s++){
/*-----------生成16进制时间戳---------- */
//生成当前时间的时间戳 //5B 0F F9 16
sprintf(timec, "%ld",time(&t));
//组装采集时间（单位s）
strcat(buffer_1,inttohex_4(atol(timec)));
lr_output_message(">>>>>>>>>>>>>>>Buffer05: %s",buffer_1);
//组装case1 ms
strcat(buffer_1,inttohex_2(120));
lr_output_message(">>>>>>>>>>>>>>>Buffer06: %s",buffer_1);
//组装case2
strcat(buffer_1,inttohex_8(113880195+s));
lr_output_message(">>>>>>>>>>>>>>>Buffer07: %s",buffer_1);
//组装case3
strcat(buffer_1,inttohex_8(22602329+s));
lr_output_message(">>>>>>>>>>>>>>>Buffer08: %s",buffer_1);
//组装case4
strcat(buffer_1,inttohex_4(174+s));
lr_output_message(">>>>>>>>>>>>>>>Buffer09: %s",buffer_1);
}
Hex_val_1 = Hex_values(buffer_1,2);
CRC8_1 = Checksum_CRC8(Hex_val_1,strlen(buffer_1)/2);
lr_output_message(">>>>CRC8_1>>>>>%x ",CRC8_1);
//将CRC8校验值，转为2位数的16进制字符串
sprintf(cacr8_values1, "%02x", (int)CRC8_1);
//组装Crc8的校验值
strcat(buffer_1,cacr8_values1);
//将组装的buffer_1,转为LR识别的请求格式,比如"\xE5"
send_buffer_val = send_buffer(buffer_1);
lr_output_message(">>>最终send_buffer>>>>>%s ",send_buffer_val);
lr_save_string(send_buffer_val,"Param_data");
lr_save_int(strlen(lr_eval_string(""))/4,"Param_length");
lrs_send("socket6", "buf5", LrsLastArg);
lrs_receive("socket6", "buf6", LrsLastArg);
lrs_get_last_received_buffer("socket6", &Data, &NumberOfBytes);
if(NumberOfBytes == 8){
lr_end_transaction("post", LR_PASS);
}else{
lr_output_message(">>>最终buffer2>>>>>%s ",buffer_2);
lr_output_message(">>>>CRC8_2>>>>>%x ",CRC8_2);
lr_end_transaction("post", LR_FAIL);
}
free(cacr8_values1);
free(Hex_val_1);
lrs_free_buffer(Data);
return 0;
}
#include "lrs.h"
vuser_end()
{
lrs_close_socket("socket6");
lrs_cleanup();
return 0;
} 步骤4：在data.ws中，进行参数化，并引入发送的数据内容，代码如下
;WSRData 2 1
send buf5
""
recv buf6 4
"\x48\x01\x03\x4c"
-1 结果：
Action.c(119): >>>>CRC8_1>>>>>98
Action.c(124):>>>>buffer1：
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
Action.c(135): >>>最终send_buffer：
\x01\x0b\x07\x01\xc0\x64\x38\x36\x38\x33\x34\x35\x30\x33\x31\x34\x32\x36\x35\x39\x36\x38\x39\x38\x36\x30\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x7a\x0a\x5b\x6d\x33\x0f\x78\x06\xc9\xac\x83\x01\x58\xe2\x59\x00\xae\x00\x69\x05\xf2\x00\x00\x05\x09\x00\x00\x00\x90\x00\x00\x00\x9b\x00\x02\xe1\xd8\x01\x9c\x01\x0b\x00\xe7\x5b\x6d\x33\x10\x78\x06\xc9\xac\x84\x01\x58\xe2\x5a\x00\xaf\x00\x6a\x05\xf3\x00\x00\x05\x0a\x00\x00\x00\x91\x00\x00\x00\x9c\x00\x02\xe1\xd9\x01\x9d\x01\x0c\x00\xe8\x5b\x6d\x33\x11\x78\x06\xc9\xac\x85\x01\x58\xe2\x5b\x00\xb0\x00\x6b\x05\xf4\x00\x00\x05\x0b\x00\x00\x00\x92\x00\x00\x00\x9d\x00\x02\xe1\xda\x01\x9e\x01\x0d\x00\xe9\x5b\x6d\x33\x12\x78\x06\xc9\xac\x86\x01\x58\xe2\x5c\x00\xb1\x00\x6c\x05\xf5\x00\x00\x05\x0c\x00\x00\x00\x93\x00\x00\x00\x9e\x00\x02\xe1\xdb\x01\x9f\x01\x0e\x00\xea\x5b\x6d\x33\x13\x78\x06\xc9\xac\x87\x01\x58\xe2\x5d\x00\xb2\x00\x6d\x05\xf6\x00\x00\x05\x0d\x00\x00\x00\x94\x00\x00\x00\x9f\x00\x02\xe1\xdc\x01\xa0\x01\x0f\x00\xeb\x5b\x6d\x33\x14\x78\x06\xc9\xac\x88\x01\x58\xe2\x5e\x00\xb3\x00\x6e\x05\xf7\x00\x00\x05\x0e\x00\x00\x00\x95\x00\x00\x00\xa0\x00\x02\xe1\xdd\x01\xa1\x01\x10\x00\xec\x5b\x6d\x33\x15\x78\x06\xc9\xac\x89\x01\x58\xe2\x5f\x00\xb4\x00\x6f\x05\xf8\x00\x00\x05\x0f\x00\x00\x00\x96\x00\x00\x00\xa1\x00\x02\xe1\xde\x01\xa2\x01\x11\x00\xed\x5b\x6d\x33\x16\x78\x06\xc9\xac\x8a\x01\x58\xe2\x60\x00\xb5\x00\x70\x05\xf9\x00\x00\x05\x10\x00\x00\x00\x97\x00\x00\x00\xa2\x00\x02\xe1\xdf\x01\xa3\x01\x12\x00\xee\x5b\x6d\x33\x17\x78\x06\xc9\xac\x8b\x01\x58\xe2\x61\x00\xb6\x00\x71\x05\xfa\x00\x00\x05\x11\x00\x00\x00\x98\x00\x00\x00\xa3\x00\x02\xe1\xe0\x01\xa4\x01\x13\x00\xef\x5b\x6d\x33\x17\x78\x06\xc9\xac\x8c\x01\x58\xe2\x62\x00\xb7\x00\x72\x05\xfb\x00\x00\x05\x12\x00\x00\x00\x99\x00\x00\x00\xa4\x00\x02\xe1\xe1\x01\xa5\x01\x14\x00\xf0\x98\x4e
难点和解决思路：
1、了解TCP或UDP协议，细心观察TCP/UDP协议通讯过程中数据变化，比如：wareshark等底层抓包工具
2、了解CRC校验，并在CRC校验前，所有16进制数据，都需要转成16进制数组
3、字符串或数字如何转为16进制字符串，比如：数据太长，itoa和sprintf无法转，就需要一个一个字符的方法去转
4、要了解lr发出socket请求时的格式如何，所以这里最终组装的16进制字符串，转为lr能send出去的格式
5、如何发送较长的数据包，目前就是封装方法
6、最终要是敢于尝试和总结
7、本次测试脚本开发时间紧张，加上能力有限，所以还有优化和不足之处，不喜请喷。