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Linux基础——socket的UDP实现

与TCP连接相差不多,UDP同样需要套接字socket产生。

注意:UDP中需要知道对方的IP及port,这样才能正确的传送数据。

UDP服务器实现代码如下:

 1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <string.h> 4 #include <sys/socket.h> 5 #include <sys/types.h> 6 #include <netinet/in.h> 7 #include <arpa/inet.h> 8 #include <unistd.h> 9 #define IP "192.168.0.124"10 #define PORT 1000011 int main(int argc,char *argv[])12 {13     int fd;14     if((fd = socket(AF_INET,SOCK_DGRAM,0))==-1)15     {16         perror("socket");17         exit(1);18     }19     struct sockaddr_in addr,addr_client;20     memset(&addr,0,sizeof(addr));21     memset(&addr_client,0,sizeof(addr_client));22     int len = sizeof(addr_client);23     addr.sin_family=AF_INET;24     addr.sin_port=htons(PORT);25     addr.sin_addr.s_addr=inet_addr(IP);26     if(-1 == bind(fd,(struct sockaddr*)&addr,sizeof(addr)))27     {28         perror("bind");29         exit(1);30     }31     char buf[128];32     memset(buf,0,128);33     recvfrom(fd,buf,128,0,(struct sockaddr*)&addr_client,&len);34                 printf("recv : %s from  %s : %d\n",buf,inet_ntoa(addr_client.sin_addr),ntohs(addr_client.sin_port));35         if(fork()>0)36         {37             while(memset(buf,0,128),recvfrom(fd,buf,128,0,(struct sockaddr*)&addr_client,&len)>0)38                 printf("recv : %s from  %s : %d\n",buf,inet_ntoa(addr_client.sin_addr),ntohs(addr_client.sin_port));39             exit(0);40         }41         while(memset(buf,0,128),fgets(buf,128,stdin)!=NULL)42             sendto(fd,buf,strlen(buf),0,(struct sockaddr*)&addr_client,sizeof(addr));43         wait(NULL);44     close(fd);45     return 0;46 }
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客户端实现代码如下:

 1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <string.h> 4 #include <unistd.h> 5 #include <netinet/in.h> 6 #include <sys/types.h> 7 #include <sys/socket.h> 8 #include <arpa/inet.h> 9 #define IP "192.168.0.173"10 #define PORT 999911 int main(int argc,char *argv[])12 {13     int fd;14     if((fd = socket(AF_INET,SOCK_DGRAM,0))==-1 )15     {16         perror("socket");17         exit(1);18     }19     struct sockaddr_in addr;20     memset(&addr,0,sizeof(addr));21     int len = sizeof(addr);22     addr.sin_family = AF_INET;23     addr.sin_port = htons(PORT);24     addr.sin_addr.s_addr = inet_addr(IP);25     char buf[128];26     int sendn;27         if(fork()==0)28         {29             while(memset(buf,0,128),fgets(buf,128,stdin)!=NULL)30                 sendto(fd,buf,strlen(buf),0,(struct sockaddr*)&addr,len);31             exit(0);32         }33         while(memset(buf ,0 ,128),recvfrom(fd,buf,128,0,(struct sockaddr*)&addr,&len)>0)34             printf("recv : %s  form : %s:%d\n",buf,inet_ntoa(addr.sin_addr),ntohs(addr.sin_port));35         wait(NULL);36     close(fd);37     return 0;38 }
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Linux基础——socket的UDP实现