补充课后作业

ch05/homework/tcp_client_kehou5.c

@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+void error_handling(char *message);
+
+int main(int argc, char* argv[])
+{
+	int sock;
+	struct sockaddr_in serv_addr;
+
+	char msg1[]="Hello server!";
+	char msg2[]="I'm client.";
+	char msg3[]="Nice to meet you too!";
+	char* str_arr[]={msg1, msg2, msg3};
+	char read_buf[100];
+
+	int str_len, i;
+	
+	if(argc!=3){
+		printf("Usage : %s <IP> <port>\n", argv[0]);
+		exit(1);
+	}
+	
+	sock=socket(PF_INET, SOCK_STREAM, 0);
+	if(sock == -1)
+		error_handling("socket() error");
+	
+	memset(&serv_addr, 0, sizeof(serv_addr));
+	serv_addr.sin_family=AF_INET;
+	serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
+	serv_addr.sin_port=htons(atoi(argv[2]));
+	
+	if(connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1) 
+		error_handling("connect() error!");
+
+	for(i=0; i<3; i++)
+	{
+		read(sock, (char*)(&str_len), 4);
+		read(sock, read_buf, str_len);
+		puts(read_buf);
+
+		str_len=strlen(str_arr[i])+1;
+		write(sock, (char*)(&str_len), 4);
+		write(sock, str_arr[i], str_len);
+	}
+	close(sock);
+	return 0;
+}
+
+void error_handling(char *message)
+{
+	fputs(message, stderr);
+	fputc('\n', stderr);
+	exit(1);
+}

ch05/homework/tcp_client_kehou6.c

@@ -0,0 +1,59 @@
+/***************************************recvsend_clnt.c***************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+
+#define BUF_SIZE 30
+void error_handling(char *message);
+
+int main(int argc, char *argv[])
+{
+	int sd;
+	FILE *fp;
+	
+	char buf[BUF_SIZE];
+	char file_name[BUF_SIZE];
+	int read_cnt;
+	struct sockaddr_in serv_adr;
+	if(argc!=3) {
+		printf("Usage: %s <IP> <port>\n", argv[0]);
+		exit(1);
+	}
+	
+    //输入文件名
+	printf("Input file name: ");
+	scanf("%s", file_name);
+    //打开文件名
+	fp=fopen(file_name, "wb");
+    
+    //创建套接字
+	sd=socket(PF_INET, SOCK_STREAM, 0);  
+    //初始化 
+	memset(&serv_adr, 0, sizeof(serv_adr));
+	serv_adr.sin_family=AF_INET;
+	serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
+	serv_adr.sin_port=htons(atoi(argv[2]));
+
+	connect(sd, (struct sockaddr*)&serv_adr, sizeof(serv_adr));
+    //写入要传输的文件
+	write(sd, file_name, strlen(file_name)+1);	
+
+	while((read_cnt=read(sd, buf, BUF_SIZE))!=0)
+		fwrite((void*)buf, 1, read_cnt, fp);
+	
+	fclose(fp);
+	close(sd);
+	return 0;
+}
+
+void error_handling(char *message)
+{
+	fputs(message, stderr);
+	fputc('\n', stderr);
+	exit(1);
+}
+
+

ch05/homework/tcp_server_kehou5.c

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+void error_handling(char *message);
+
+int main(int argc, char *argv[])
+{
+	int serv_sock;
+	int clnt_sock;
+	int str_len, i;
+
+	struct sockaddr_in serv_addr;
+	struct sockaddr_in clnt_addr;
+	socklen_t clnt_addr_size;
+
+	char msg1[]="Hello client!";
+	char msg2[]="I'm server.";
+	char msg3[]="Nice to meet you.";
+	char* str_arr[]={msg1, msg2, msg3};
+	char read_buf[100];
+	
+	if(argc!=2){
+		printf("Usage : %s <port>\n", argv[0]);
+		exit(1);
+	}
+	
+	serv_sock=socket(PF_INET, SOCK_STREAM, 0);
+	if(serv_sock == -1)
+		error_handling("socket() error");
+	
+	memset(&serv_addr, 0, sizeof(serv_addr));
+	serv_addr.sin_family=AF_INET;
+	serv_addr.sin_addr.s_addr=htonl(INADDR_ANY);
+	serv_addr.sin_port=htons(atoi(argv[1]));
+	
+	if(bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1)
+		error_handling("bind() error"); 
+	
+	if(listen(serv_sock, 5)==-1)
+		error_handling("listen() error");
+	
+	clnt_addr_size=sizeof(clnt_addr);  
+	clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_addr,&clnt_addr_size);
+	if(clnt_sock==-1)
+		error_handling("accept() error");  
+	
+	for(i=0; i<3; i++)
+	{
+        //需要写入的字符串的长度
+		str_len=strlen(str_arr[i])+1;
+		write(clnt_sock, (char*)(&str_len), 4);
+        //写入字符串
+		write(clnt_sock, str_arr[i], str_len);
+		
+        //读取的字符串长度
+		read(clnt_sock, (char*)(&str_len), 4);
+        //读取的字符串
+		read(clnt_sock, read_buf, str_len);
+		puts(read_buf);
+	}
+	
+	close(clnt_sock);
+	close(serv_sock);
+	return 0;
+}
+
+void error_handling(char *message)
+{
+	fputs(message, stderr);
+	fputc('\n', stderr);
+	exit(1);
+}
+

ch05/homework/tcp_server_kehou6.c

@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+
+#define BUF_SIZE 30
+void error_handling(char *message);
+
+int main(int argc, char *argv[])
+{
+	int serv_sd, clnt_sd;
+	FILE * fp;
+	char buf[BUF_SIZE];
+	char file_name[BUF_SIZE];
+	int read_cnt;
+	
+	struct sockaddr_in serv_adr, clnt_adr;
+	socklen_t clnt_adr_sz;
+	
+	if(argc!=2) {
+		printf("Usage: %s <port>\n", argv[0]);
+		exit(1);
+	}
+	
+	serv_sd=socket(PF_INET, SOCK_STREAM, 0);   
+	
+	memset(&serv_adr, 0, sizeof(serv_adr));
+	serv_adr.sin_family=AF_INET;
+	serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
+	serv_adr.sin_port=htons(atoi(argv[1]));
+	
+	bind(serv_sd, (struct sockaddr*)&serv_adr, sizeof(serv_adr));
+	listen(serv_sd, 5);
+	
+	clnt_adr_sz=sizeof(clnt_adr);    
+	clnt_sd=accept(serv_sd, (struct sockaddr*)&clnt_adr, &clnt_adr_sz);
+	
+    //读取客户端传入的文件名
+	read(clnt_sd, file_name, BUF_SIZE);
+    //打开文件
+	fp=fopen(file_name, "rb");
+    //文件存在
+	if(fp!=NULL)
+	{
+		while(1)
+		{
+			read_cnt=fread((void*)buf, 1, BUF_SIZE, fp);
+			if(read_cnt<BUF_SIZE)
+			{
+				write(clnt_sd, buf, read_cnt);
+				break;
+			}
+			write(clnt_sd, buf, BUF_SIZE);
+		}
+	}
+	
+	fclose(fp);
+	close(clnt_sd); close(serv_sd);
+	return 0;
+}
+
+void error_handling(char *message)
+{
+	fputs(message, stderr);
+	fputc('\n', stderr);
+	exit(1);
+}
+
+