[网络协议]udp 简化分节

#include<stdio.h>
#include<stdint.h>
#include<sys/socket.h>
#include<unistd.h>
#include<string.h>
#include<stdlib.h>
#include<sys/select.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<sys/errno.h>
#include<strings.h>
#include<pthread.h>
#include "debug.h"
#include <stdarg.h>

pthread_mutex_t log_pthread_mutex;

void hex_echo(uint8_t *msg,int len)
{
	int i = 0,cnt = 0;

	for( i = 0 ; i < len ; i++){
		 printf("%02x ",msg[i]);
		 cnt++;
		 if(cnt % 8 == 0){
			printf("\n");
		 }
	}
	printf("\n\n");
}

void wlog(uint8_t *msg,int len)
{
	int i,cnt,cnt_all;
	cnt = len/16;
	cnt_all = (len % 16)? 1 : 0;
	uint8_t *log_buffer = (uint8_t*)calloc((sizeof(uint8_t)),3*len+cnt+cnt_all+2);
	char tmp[4]={0};
	
	cnt = 0;
	for( i = 0 ; i < len ; i++){
		sprintf(tmp,"%02x ",msg[i]);
		strcat((char*)log_buffer,tmp);
		cnt++;
		if(cnt % 16 == 0){
			memset(tmp,0,4);
			sprintf(tmp,"\n");
			strcat((char*)log_buffer,tmp);
		}
		memset(tmp,0,4);
	}
	
	sprintf(tmp,"\n\n");
	strcat((char*)log_buffer,tmp);

	LOG_COM("/home/HongYu/debug_net_log.txt","%s",log_buffer);

	free(log_buffer);
	log_buffer = NULL;
}

void ir_hex_log(uint8_t *msg,int len)
{
	pthread_mutex_lock(&log_pthread_mutex);
	 wlog(msg,len);
	pthread_mutex_unlock(&log_pthread_mutex);
}

extern void log_com(int error_level,char *file_name,const char *format,va_list args);
void ir_common_log(const char *fmt,... ){
	pthread_mutex_lock(&log_pthread_mutex);
	va_list para_list;
	va_start(para_list,fmt);
	log_com(INFO,"/home/HongYu/debug_net_log.txt",fmt,para_list);	
	va_end(para_list);
	pthread_mutex_unlock(&log_pthread_mutex);
}

int crc_table[256] = 
{
	0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
	0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
	0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
	0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
	0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
	0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
	0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
	0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
	0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
	0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
	0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
	0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
	0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
	0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
	0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
	0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
	0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
	0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
	0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
	0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
	0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
	0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
	0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
	0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
	0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
	0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
	0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
	0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
	0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
	0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
	0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
	0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};

unsigned short crc16(unsigned char *pbuf, int len)
{
	unsigned short  crc = 0;

	while(len)
	{
		crc = (crc << 8) ^ crc_table[((crc >> 8) ^ *pbuf) & 0xFF];
		len--;
		pbuf++;
	}
	return crc;
}


void* udp_net_debug(void *arg)
{
	int udp_fd = socket(AF_INET,SOCK_DGRAM,0);
	int enable_select = 1;

	if(setsockopt(udp_fd,SOL_SOCKET,SO_REUSEADDR,&enable_select,sizeof(int)) == -1){
		printf("sys error:%s\n",strerror(errno));			
	}

	struct sockaddr_in recv_addr,local_addr;
	local_addr.sin_family = AF_INET;
	local_addr.sin_port = htons(8800);
	local_addr.sin_addr.s_addr = INADDR_ANY;

	socklen_t addrlen = sizeof(struct sockaddr);
	int res = bind(udp_fd,(struct sockaddr*)&local_addr,addrlen);
	if(res < 0){
		printf("sys error:%s\n",strerror(errno));			
	}

	unsigned char recv_buffer[2048]={0};
	unsigned char send_buffer[2048]={0};
	int recv_size;
	unsigned char crc_buffer[17];
	unsigned char *start_cpy;
	unsigned short crc_tmp;

	while(1){
		recv_size = recvfrom(udp_fd,recv_buffer,2048,0,(struct sockaddr*)&recv_addr,&addrlen);
		LOG_INFO("/home/HongYu/debug_net_log.txt","recv size: %d\n",recv_size);
		wlog(recv_buffer,recv_size);

		if( (recv_buffer[17] == 0x05 || recv_buffer[17] == 0x06 || recv_buffer[17] == 0x07) && recv_size == 21){ //不判断22个字节的心跳,对普通心跳进行维护和使用,可以登录判断
			memcpy(send_buffer,recv_buffer,recv_size);
			send_buffer[13] = 0x0;
			send_buffer[10] = 0x0;
			start_cpy = send_buffer+1;
			memcpy(crc_buffer,start_cpy,17);
			crc_tmp = crc16(crc_buffer,17);		
			send_buffer[19] = (crc_tmp & 0xFF00) >> 8;
			send_buffer[18] = crc_tmp & 0xFF;
			LOG_INFO("/home/HongYu/debug_net_log.txt","reponse type: %02x\n",recv_buffer[17]);
			wlog(send_buffer,21);
		}
		
		sendto(udp_fd,send_buffer,21,0,(struct sockaddr*)&recv_addr,addrlen);
		recv_size = 0;
		bzero((struct sockaddr*)&recv_addr,addrlen);
		memset(send_buffer,0,sizeof(send_buffer));
		memset(recv_buffer,0,sizeof(send_buffer));
	}
}

void pthread_heart_udp(void)
{
	pthread_t heart_thid;
	pthread_create(&heart_thid,NULL,udp_net_debug,NULL);
}

int main(void)
{
	pthread_mutex_init(&log_pthread_mutex,NULL);
	pthread_heart_udp();

	while(1){
		sleep(5);
	}
}

备注：简化分节方便以后寻找使用，还是CSDN，容易找到,gitee不太好找代码分节