linux socket utp

linux socket utp

linux socket

一种简单的基于utp通信

客户端

1. 创建套接字 使用socket
2. 载入自己的绑定信息(客户端可以选择不绑定,这将使用系统随机分配的端口) IP Port
3. 绑定信息(如果bing绑定) bing
4. 载入服务端绑定信息 IP Port
5. 设置缓冲，即要发送的信息存放处
6. 使用 载入的服务端地址和端口 发送sendto

服务端

1. 创建套接字 使用socket
2. 载入自己的绑定信息(客户端可以选择不绑定,这将使用系统随机分配的端口) IP Port
3. 绑定信息(如果bing绑定) bing
4. 设置缓冲，即要接受的信息存放处
5. 接受信息/监听端口 ** recvfrom**

客户端

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>#define N 128int main(int argc, char const *argv[]){if(argc != 3 && argc != 5){fprintf(stderr,"C ---> Sn""Error:   Missing operands!n""Usage:   %s [IP] [Port]n""Example: %s 192.168.1.1 5000n",argv[0],argv[0]);exit(1);}int sockfd;if((sockfd = socket(AF_INET,SOCK_DGRAM,0)) == -1){perror("fail to socket!n");exit(1);}printf("sockfd = %dn",sockfd);#if 1if( argc == 5){struct sockaddr_in clientaddr;clientaddr.sin_family = AF_INET;clientaddr.sin_addr.s_addr = inet_addr(argv[3]);clientaddr.sin_port = htons(atoi(argv[4]));if(bind(sockfd,(struct sockaddr *)&clientaddr,sizeof(clientaddr)) == -1){perror("fail to bind");exit(1);}}
#endifstruct sockaddr_in serveraddr;socklen_t addrlen = sizeof(serveraddr);serveraddr.sin_family = AF_INET;serveraddr.sin_addr.s_addr = inet_addr(argv[1]);serveraddr.sin_port = htons(atoi(argv[2]));char buf[N]="";while(1){fgets(buf,N,stdin);buf[strlen(buf)-1] = '';if(sendto(sockfd,buf,N,0,(struct sockaddr *)&serveraddr,addrlen) == -1){perror("fail to sendto!n");exit(1);}}close(sockfd);return 0;
}

服务端

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>#define N 128int main(int argc,char const *argv[]){if(argc != 3){fprintf(stderr,"S <--- Cn""Error:   Missing operands!n""Usage:   %s [IP] [Port]n""Example: %s 192.168.1.1 5000n",argv[0],argv[0]);exit(1);}int sockfd;if((sockfd = socket(AF_INET,SOCK_DGRAM,0)) == -1){perror("fail to socket");exit(1);}struct sockaddr_in serveraddr;serveraddr.sin_family = AF_INET;serveraddr.sin_addr.s_addr = inet_addr(argv[1]);serveraddr.sin_port = htons(atoi(argv[2]));if(bind(sockfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr)) == -1){perror("fail to bind");exit(1);}char buf[N] = "";struct sockaddr_in clientaddr;socklen_t addrlen = sizeof(struct sockaddr_in);while(1){if(recvfrom(sockfd,buf,N,0,(struct sockaddr *)&clientaddr,&addrlen) == -1){perror("fail to recvfrom");exit(1);}printf("ip:%s,port:%dn",inet_ntoa(clientaddr.sin_addr),ntohs(clientaddr.sin_port));printf("from client:  %sn",buf);}close(sockfd);return 0;
}