client.c
1 /* interactionSocket/client.c 2 * 实现终端与服务器端的交互式输入输出 3 */ 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <string.h> 7 #include <unistd.h> 8 #include <sys/types.h> 9 #include <sys/socket.h> 10 #include <netinet/in.h> 11 #include <netdb.h> 12 13 #define MAXLINE 80 14 #define PORTNUM 12345 15 16 int main(void) { 17 int sock, len; 18 struct sockaddr_in saddr; 19 struct hostent *hp; 20 char buf[MAXLINE]; 21 char request[MAXLINE]; 22 char hostname[BUFSIZ]; 23 24 sock=socket(AF_INET, SOCK_STREAM, 0); 25 if(sock==-1) exit(-1); 26 27 bzero((void*)&saddr, sizeof(saddr)); 28 //inet_pton(AF_INET, "127.0.0.1", (void*)&saddr.sin_addr); 29 gethostname(hostname, BUFSIZ); 30 hp=gethostbyname(hostname); 31 bcopy(hp->h_addr, (void*)&saddr.sin_addr, hp->h_length); 32 saddr.sin_port=htons(PORTNUM); 33 saddr.sin_family=AF_INET; 34 35 connect(sock, (struct sockaddr *)&saddr, sizeof(saddr)); 36 while( fgets(buf, MAXLINE, stdin)!=NULL) { 37 write(sock, buf, strlen(buf)); 38 len=read(sock, buf, MAXLINE); 39 if(len==0) 40 printf("the other side has been closed"); 41 else 42 write(STDOUT_FILENO, buf, len); 43 } 44 close(sock); 45 return 1; 46 }
server.c
1 /* interaction/server.c 2 */ 3 #include <stdio.h> 4 #include <stdlib.h> 5 #include <netinet/in.h> 6 #include <sys/types.h> 7 #include <sys/socket.h> 8 #include <string.h> 9 #include <netdb.h> 10 11 #define MAXLINE 80 12 #define SERV_PORT 12345 13 #define BACKLOG 20 14 int main(void ) { 15 int sock, connfd; 16 struct sockaddr_in saddr, cliaddr; 17 struct hostent *hp; 18 socklen_t cliaddr_len; 19 char buf[MAXLINE]; 20 char str[MAXLINE]; 21 char hostname[BUFSIZ]; 22 int i, n; 23 24 sock=socket(PF_INET, SOCK_STREAM, 0); 25 if(sock==-1) 26 exit(-1); 27 bzero((void*)&saddr, sizeof(saddr)); 28 //saddr.sin_addr.s_addr=htonl(INADDR_ANY); 29 gethostname(hostname, BUFSIZ); 30 hp=gethostbyname(hostname); 31 bcopy(hp->h_addr, (void*)&saddr.sin_addr, hp->h_length); 32 saddr.sin_family=AF_INET; 33 saddr.sin_port=htons(SERV_PORT); 34 if(bind(sock, (struct sockaddr*)&saddr, sizeof(saddr))==-1) 35 exit(-1); 36 if(listen(sock, BACKLOG)==-1) 37 exit(-1); 38 printf("accepting connections... "); 39 while(1) { 40 cliaddr_len=sizeof(cliaddr); 41 connfd=accept(sock, (struct sockaddr*)&cliaddr, &cliaddr_len); 42 while(1) { 43 n=read(connfd, buf, MAXLINE); 44 if(n==0){ 45 printf("the other side has been closed. "); 46 break; 47 } 48 //printf("received from %s at PORT %d ", inet_ntop(AF_INET, &cliaddr.sin_addr, str, sizeof(str)), ntohs(cliaddr.sin_port)); 49 for(i=0; i<n; i++) 50 buf[i]=toupper(buf[i]); 51 write(connfd, buf, n); 52 } 53 close(connfd); 54 } 55 }