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C网络编程-TCP套接口编程
只有几个基本的示例如下
建立服务端的绑定监听等过程的函数
1 #include<sys/types.h> 2 #include<sys/socket.h> 3 4 #include<netinet/in.h> 5 #include<arpa/inet.h> 6 #include<unistd.h> 7 8 #include<stdio.h> 9 #include<stdlib.h>10 11 #include<strings.h>12 #define PORT 234513 14 int main(void)15 {16 int sockfd,newsockfd; //socket 描述符17 18 struct sockaddr_in addr; //IPv4套接口数据结构体19 20 // struct sockaddr_in21 // {22 // uint8_t sin_len; //长度,固定16位23 // sa_family_t sin_family; //地址族，IPv4为AF_INET24 // in_port_t sin_port; //端口号25 // struct in_addr sin_addr; 26 // //27 // // struct in_addr28 // // {29 // // in_addr_t s_addr; //32位的IP地址30 // // }31 // //32 // //33 // unsigned char sin_zero[8]; //未使用的字段被填充为034 // }35 36 int addr_len=sizeof(struct sockaddr_in);37 38 if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)39 //创建socket，返回描述符，使用IPv4和流40 {41 perror("create socket error!\n");42 exit(1);43 }44 else45 {46 printf("successfully create socket\n");47 printf("socket id is %d\n",sockfd);48 }49 50 //将表示地址的结构体变量addr数据清空51 bzero(&addr,sizeof(struct sockaddr_in));52 53 //重新设定相关参数54 //使用IPv4,设置port号，还有IP地址55 addr.sin_family=AF_INET;56 addr.sin_port=htons(PORT);57 //绑定夲机默认地址58 addr.sin_addr.s_addr=htonl(INADDR_ANY);59 60 61 62 if(bind(sockfd,(struct sockaddr *)(&addr),sizeof(struct sockaddr))<0)63 //绑定套接口和参数64 {65 perror("bind error\n");66 exit(1);67 }68 else69 {70 printf("bind succefully\n");71 printf("local POST is %d\n",PORT);72 }73 74 //下面是监听过程75 if(listen(sockfd,5)<0)76 {77 perror("listen error\n");78 exit(1);79 }80 else81 {82 printf("listening........\n");83 }84 85 if((newsockfd=accept(sockfd,(struct sockaddr *)(&addr),&addr_len)<0))86 {87 perror("accept error\n");88 }89 else90 {91 printf("accept a new socket client\n");92 printf("socket id is %d\n",newsockfd);93 }94 95 return 0;96 }
连接远程主机的函数，用于服务端，使用百度的IP测试：
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<strings.h> 4 #include<netinet/in.h> 5 #include<arpa/inet.h> 6 #include<sys/types.h> 7 #include<sys/socket.h> 8 #include<sys/stat.h> 9 #include<fcntl.h>10 #include<unistd.h>11 12 #define PORT 8013 #define REMOTE_IP "119.75.218.77"14 15 int main(void)16 {17 int sockfd;18 struct sockaddr_in addr;19 if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)20 {21 perror("error to socket :");22 exit(1);23 }24 else25 {26 printf("have open socket in %d\n",sockfd);27 }28 29 bzero(&addr,sizeof(struct sockaddr_in));30 addr.sin_family=AF_INET;31 addr.sin_port=htons(PORT);32 addr.sin_addr.s_addr=inet_addr(REMOTE_IP);33 34 if(connect(sockfd,(struct sockaddr *)(&addr),sizeof(struct sockaddr))<0)35 {36 perror("error to connect : ");37 exit(1);38 }39 else40 {41 printf("connect successfully\n");42 }43 return 0;44 }
相关结构体定义：
/* Structure describing an Internet socket address. */struct sockaddr_in { __SOCKADDR_COMMON (sin_); in_port_t sin_port; /* Port number. */ struct in_addr sin_addr; /* Internet address. */ /* Pad to size of `struct sockaddr‘. */ unsigned char sin_zero[sizeof (struct sockaddr) - __SOCKADDR_COMMON_SIZE - sizeof (in_port_t) - sizeof (struct in_addr)]; };
使用recv接受远程服务器的返回信息
ftp.gnu.org IP=208.118.235.20
1 #include<stdio.h> 2 #include<strings.h> 3 #include<arpa/inet.h> 4 #include<netinet/in.h> 5 #include<unistd.h> 6 #include<stdlib.h> 7 #include<fcntl.h> 8 #include<sys/stat.h> 9 #include<sys/socket.h>10 #include<sys/types.h>11 12 //ftp默认端口是2113 #define PORT 2114 #define REMOTE_IP "208.118.235.20"15 16 17 int main(void)18 {19 int sockfd;20 struct sockaddr_in addr;21 char buf[1024];22 23 if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)24 {25 perror("error to socket :");26 exit(1);27 }28 else29 {30 printf("successful sockfd is %d\n",sockfd);31 }32 33 bzero(&addr,sizeof(struct sockaddr_in));34 addr.sin_family=AF_INET;35 addr.sin_port=htons(PORT);36 addr.sin_addr.s_addr=inet_addr(REMOTE_IP);37 38 if(connect(sockfd,(struct sockaddr *)(&addr),sizeof(struct sockaddr))<0)39 {40 perror("error on connect :");41 exit(1);42 }43 else44 {45 printf("connect gun successfully\n");46 printf("IP=%s\n",REMOTE_IP);47 printf("PORT=%d\n\n",PORT);48 }49 50 //接受数据51 recv(sockfd,buf,sizeof(buf),0);52 53 printf("msg receved\n");54 //输出数据55 printf("%s",buf);56 57 printf("\n");58 59 return 0;60 }
使用read读取数据：
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<strings.h> 4 #include<netinet/in.h> 5 #include<arpa/inet.h> 6 #include<sys/types.h> 7 #include<sys/socket.h> 8 #include<sys/stat.h> 9 #include<fcntl.h>10 #include<unistd.h>11 12 #define PORT 234513 #define REMOTE_IP "192.168.1.102"14 15 int main(void)16 {17 int sockfd;18 int newsockfd;19 20 struct sockaddr_in addr;21 22 int addr_len=sizeof(struct sockaddr_in);23 24 char msgbuf[256];25 26 if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)27 {28 perror("error to socket :");29 exit(1);30 }31 else32 {33 printf("have open socket in %d\n",sockfd);34 }35 36 bzero(&addr,sizeof(struct sockaddr_in));37 addr.sin_family=AF_INET;38 addr.sin_port=htons(PORT);39 addr.sin_addr.s_addr=htons(INADDR_ANY);40 41 if(bind(sockfd,(struct sockaddr *)(&addr),sizeof(struct sockaddr))<0)42 {43 perror("bind error :");44 exit(1);45 }46 else47 {48 printf("bind OK!\n");49 }50 51 if(listen(sockfd,5)<0)52 {53 printf("listen error :");54 exit(1);55 }56 else57 {58 printf("listening ...\n");59 }60 61 if((newsockfd=accept(sockfd,(struct sockaddr *)(&addr),&addr_len)))62 {63 perror("accept error");64 exit(1);65 }66 else67 {68 printf("accept OK!\n");69 70 if(read(newsockfd,msgbuf,sizeof(msgbuf))<=0)71 {72 perror("read error :");73 exit(1);74 }75 else76 {77 printf("msgbox : %s \n",msgbuf);78 }79 }80 81 return 0;82 }
C网络编程-TCP套接口编程
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