Linux中使用C语言实现基于UDP协议的Socket通信示例

#include <errno.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include <stdlib.h> 
#include <string.h> 
#include <netinet/in.h> 
#include <stdio.h> 
#include <unistd.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
 
int main(int argc,char **argv) 
{ 
 printf("server ip: %s/n",argv[1]); 
 printf("server port: %s/n",argv[2]); 
 
 printf("/n service starting.../n/n"); 
 int  socketFd; 
 struct sockaddr_in svrAddr; 
 struct sockaddr_in localAddr; 
 
 socketFd = socket (AF_INET,SOCK_DGRAM,0); 
 if ( -1 == socketFd ) 
 { 
  perror( "socket:" ); 
  exit(-1); 
 } 
 
 // 设置地址可复用 
 int option = 1; 
 setsockopt( socketFd,SOL_SOCKET,SO_REUSEADDR,&option,sizeof(option) ); 
 // 客户端IP 
 memset(&localAddr,sizeof(localAddr)); 
 localAddr.sin_family = AF_INET; 
 localAddr.sin_addr.s_addr = inet_addr( argv[1]); 
 localAddr.sin_port = htons (atoi(argv[2])); 
 
 int bindResult = bind(socketFd,(struct sockaddr *) &localAddr,sizeof(localAddr)); 
 if ( -1 == bindResult ) 
 { 
  perror( "bind:" ); 
  close(socketFd); 
  exit(-1); 
 } 
 
 // 服务器IP 
 memset(&svrAddr,sizeof(svrAddr)); 
 svrAddr.sin_family = AF_INET; 
 svrAddr.sin_addr.s_addr = inet_addr( argv[1]); 
 svrAddr.sin_port = htons (atoi(argv[2])); 
 char tempBuff[2048] = {0}; 
 
 for ( ; ; ) 
 { 
  // 接收数据 
  struct sockaddr_in fromAddr; 
  memset((char *)&fromAddr,(int)sizeof(fromAddr)); 
  socklen_t fromLen = sizeof(fromAddr); 
  ssize_t result = recvfrom( socketFd,tempBuff,sizeof(tempBuff),(struct sockaddr *)&fromAddr,&fromLen);  
  if ( -1 == result ) 
  { 
   perror("recvfrom:"); 
   continue; 
  } 
  else 
  { 
   printf( "recv data %s successed. data len: %d/n",inet_ntoa(fromAddr.sin_addr),result ); 
   printf( "data:/n"); 
   for ( int i = 0; i < result; i++ ) 
   { 
    printf( "%02x ",tempBuff[i] ); 
    if ( (i+1)%16 == 0 ) 
    { 
     printf( "/n" ); 
    } 
   } 
   printf( "/n" ); 
  } 
   
  // 发送数据 
  result = sendto( socketFd,result,(struct sockaddr*)&fromAddr,sizeof(fromAddr)); 
  if ( -1 == result ) 
  { 
   perror("sendto:"); 
  } 
  else 
  { 
   printf("send data success. data len:%d/n",result ); 
  }   
  sleep( 60 ); 
 } 
 close(socketFd); 
} 

#include <errno.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include <stdlib.h> 
#include <string.h> 
#include <netinet/in.h> 
#include <stdio.h> 
#include <unistd.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
 
typedef struct _NSS_HEADER 
{ 
 unsigned short   ProtocolVersion;  /* 协议版本信息 */ 
 unsigned short   MsgType;    /* 消息类型 */ 
 unsigned short   TransactionNo;   /* 传输编号 */ 
 unsigned short   PacketLength;   /* 数据包长度,包括Header */ 
}NSS_HEADER; 
 
int main(int argc,char **argv) 
{ 
 printf("client ip: %s/n",argv[1]); 
 printf("client port: %s/n",argv[2]); 
 printf("server ip: %s/n",argv[3]); 
 printf("server port: %s/n",argv[4]); 
 
 printf("/n service starting.../n/n"); 
 int  socketFd; 
 struct sockaddr_in svrAddr; 
 struct sockaddr_in localAddr; 
 
 socketFd = socket (AF_INET,sizeof(localAddr)); 
 if ( -1 == bindResult ) 
 { 
  perror( "bind:" ); 
  sleep(10); 
  close(socketFd); 
  exit(-1); 
 } 
 
 // 服务器IP 
 memset(&svrAddr,sizeof(svrAddr)); 
 svrAddr.sin_family = AF_INET; 
 svrAddr.sin_addr.s_addr = inet_addr( argv[3]); 
 svrAddr.sin_port = htons (atoi(argv[4])); 
 char tempBuff[2048] = {0}; 
 
 // 每分钟发送一次数据 
 NSS_HEADER hdr; 
 memset( &hdr,sizeof(NSS_HEADER)); 
 for ( ; ; ) 
 { 
  // 发送数据 
  hdr.TransactionNo++; 
  ssize_t result = sendto( socketFd,&hdr,sizeof(NSS_HEADER),(struct sockaddr*)&svrAddr,sizeof(svrAddr)); 
  if ( -1 == result ) 
  { 
   perror("sendto:"); 
  } 
  else 
  { 
   printf("send data success. data len:%d/n",result ); 
  } 
 
  // 接收数据 
  struct sockaddr_in fromAddr; 
  memset((char *)&fromAddr,(int)sizeof(fromAddr)); 
  socklen_t fromLen = sizeof(fromAddr); 
  result = recvfrom( socketFd,&fromLen);  
  if ( -1 == result ) 
  { 
   perror("recvfrom:"); 
  } 
  else 
  { 
   printf( "recv data %s successed. data len: %d/n",tempBuff[i] ); 
    if ( (i+1)%16 == 0 ) 
    { 
     printf( "/n" ); 
    } 
   } 
   printf("/n"); 
  } 
  sleep( 60 ); 
 } 
 close(socketFd); 
}