2018-2019-1 《信息安全系統設計基礎》實驗三:並發程序
阿新 • • 發佈:2018-11-18
大量 inet_pton gin 考題 queue 時間 初始化 設計 127.0.0.1
2018-2019-1 《信息安全系統設計基礎》實驗三:並發程序
任務一
要求:
基於Linux Socket程序設計實現wc(1)服務器(端口號是你學號的後6位)和客戶端
客戶端傳一個文本文件給服務器
服務器返加文本文件中的單詞數
- wc命令參數:
-c:統計字節數
-l:統計行數
-m:統計字符數。這個標誌不能與 -c 標誌一起使用。
-w:統計字數。一個字被定義為由空白、跳格或換行字符分隔的字符串
-L:打印最長行的長度
-help:顯示幫助信息
--version:顯示版本信息
-
網上找的代碼:
這是之前做簡單對話時找的代碼
server:
#include<netinet/in.h> // sockaddr_in #include<sys/types.h> // socket #include<sys/socket.h> // socket #include<stdio.h> // printf #include<stdlib.h> // exit #include<string.h> // bzero #define SERVER_PORT 8000 #define LENGTH_OF_LISTEN_QUEUE 20 #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512 int main(void) { // 聲明並初始化一個服務器端的socket地址結構 struct sockaddr_in server_addr; bzero(&server_addr, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = htons(INADDR_ANY); server_addr.sin_port = htons(SERVER_PORT); // 創建socket,若成功,返回socket描述符 int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0); if(server_socket_fd < 0) { perror("Create Socket Failed:"); exit(1); } int opt = 1; setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); // 綁定socket和socket地址結構 if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)))) { perror("Server Bind Failed:"); exit(1); } // socket監聽 if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE))) { perror("Server Listen Failed:"); exit(1); } while(1) { // 定義客戶端的socket地址結構 struct sockaddr_in client_addr; socklen_t client_addr_length = sizeof(client_addr); // 接受連接請求,返回一個新的socket(描述符),這個新socket用於同連接的客戶端通信 // accept函數會把連接到的客戶端信息寫到client_addr中 int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length); if(new_server_socket_fd < 0) { perror("Server Accept Failed:"); break; } // recv函數接收數據到緩沖區buffer中 char buffer[BUFFER_SIZE]; bzero(buffer, BUFFER_SIZE); if(recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0) { perror("Server Recieve Data Failed:"); break; } // 然後從buffer(緩沖區)拷貝到file_name中 char file_name[FILE_NAME_MAX_SIZE+1]; bzero(file_name, FILE_NAME_MAX_SIZE+1); strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer)); printf("%s\n", file_name); // 打開文件並讀取文件數據 FILE *fp = fopen(file_name, "r"); if(NULL == fp) { printf("File:%s Not Found\n", file_name); } else { bzero(buffer, BUFFER_SIZE); int length = 0; // 每讀取一段數據,便將其發送給客戶端,循環直到文件讀完為止 while((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0) { if(send(new_server_socket_fd, buffer, length, 0) < 0) { printf("Send File:%s Failed./n", file_name); break; } bzero(buffer, BUFFER_SIZE); } // 關閉文件 fclose(fp); printf("File:%s Transfer Successful!\n", file_name); } // 關閉與客戶端的連接 close(new_server_socket_fd); } // 關閉監聽用的socket close(server_socket_fd); return 0; }
client:
#include<netinet/in.h> // sockaddr_in #include<sys/types.h> // socket #include<sys/socket.h> // socket #include<stdio.h> // printf #include<stdlib.h> // exit #include<string.h> // bzero #define SERVER_PORT 8000 #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512 int main() { // 聲明並初始化一個客戶端的socket地址結構 struct sockaddr_in client_addr; bzero(&client_addr, sizeof(client_addr)); client_addr.sin_family = AF_INET; client_addr.sin_addr.s_addr = htons(INADDR_ANY); client_addr.sin_port = htons(0); // 創建socket,若成功,返回socket描述符 int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0); if(client_socket_fd < 0) { perror("Create Socket Failed:"); exit(1); } // 綁定客戶端的socket和客戶端的socket地址結構 非必需 if(-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr)))) { perror("Client Bind Failed:"); exit(1); } // 聲明一個服務器端的socket地址結構,並用服務器那邊的IP地址及端口對其進行初始化,用於後面的連接 struct sockaddr_in server_addr; bzero(&server_addr, sizeof(server_addr)); server_addr.sin_family = AF_INET; if(inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0) { perror("Server IP Address Error:"); exit(1); } server_addr.sin_port = htons(SERVER_PORT); socklen_t server_addr_length = sizeof(server_addr); // 向服務器發起連接,連接成功後client_socket_fd代表了客戶端和服務器的一個socket連接 if(connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0) { perror("Can Not Connect To Server IP:"); exit(0); } // 輸入文件名 並放到緩沖區buffer中等待發送 char file_name[FILE_NAME_MAX_SIZE+1]; bzero(file_name, FILE_NAME_MAX_SIZE+1); printf("Please Input File Name On Server:\t"); scanf("%s", file_name); char buffer[BUFFER_SIZE]; bzero(buffer, BUFFER_SIZE); strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name)); // 向服務器發送buffer中的數據 if(send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0) { perror("Send File Name Failed:"); exit(1); } // 打開文件,準備寫入 FILE *fp = fopen(file_name, "w"); if(NULL == fp) { printf("File:\t%s Can Not Open To Write\n", file_name); exit(1); } // 從服務器接收數據到buffer中 // 每接收一段數據,便將其寫入文件中,循環直到文件接收完並寫完為止 bzero(buffer, BUFFER_SIZE); int length = 0; while((length = recv(client_socket_fd, buffer, BUFFER_SIZE, 0)) > 0) { if(fwrite(buffer, sizeof(char), length, fp) < length) { printf("File:\t%s Write Failed\n", file_name); break; } bzero(buffer, BUFFER_SIZE); } // 接收成功後,關閉文件,關閉socket printf("Receive File:\t%s From Server IP Successful!\n", file_name); close(fp); close(client_socket_fd); return 0; }
- 根據要求改成了讀取文件:
printf("%s\n", file_name);
FILE *fp = fopen(file_name, "w");
- 以及讀取字數:
int words=0;
char s[100];
FILE *fp2;
if((fp2=fopen(file_name,"r"))==NULL){
printf("ERROR!\n");
exit(0);
}
while(fscanf(fp2,"%s",s)!=EOF)
words++;
fclose(fp2);
printf("%d words.\n",words);
修改後實驗代碼:
server.c:
#include<netinet/in.h> // sockaddr_in
#include<sys/types.h> // socket
#include<sys/socket.h> // socket
#include<stdio.h> // printf
#include<stdlib.h> // exit
#include<string.h> // bzero
#define SERVER_PORT 155323
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
#define BEGIN 1;
int main(void)
{
struct sockaddr_in server_addr;
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htons(INADDR_ANY);
server_addr.sin_port = htons(SERVER_PORT);
int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0);
if(server_socket_fd < 0)
{
perror("Create Socket Failed:");
exit(1);
}
int opt = 1;
setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))
{
perror("Server Bind Failed:");
exit(1);
}
if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))
{
perror("Server Listen Failed:");
exit(1);
}
while(1)
{
struct sockaddr_in client_addr;
socklen_t client_addr_length = sizeof(client_addr);
int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length);
if(new_server_socket_fd < 0)
{
perror("Server Accept Failed:");
break;
}
char buffer[BUFFER_SIZE];
bzero(buffer, BUFFER_SIZE);
if(recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0)
{
perror("Server Recieve Data Failed:");
break;
}
char file_name[FILE_NAME_MAX_SIZE+1];
bzero(file_name, FILE_NAME_MAX_SIZE+1);
strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));
printf("%s\n", file_name);
FILE *fp = fopen(file_name, "w");
if(NULL == fp)
{
printf("File:\t%s Can Not Open To Write\n", file_name);
exit(1);
}
bzero(buffer, BUFFER_SIZE);
int length = 0;
while((length = recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)
{
if(strcmp(buffer,"OK")==0) break;
if(fwrite(buffer, sizeof(char), length, fp) < length)
{
printf("File:\t%s Write Failed\n", file_name);
break;
}
bzero(buffer, BUFFER_SIZE);
}
printf("Receive File:\t%s From Client IP Successful!\n", file_name);
fclose(fp);
int words=0;
char s[100];
FILE *fp2;
if((fp2=fopen(file_name,"r"))==NULL){
printf("ERROR!\n");
exit(0);
}
while(fscanf(fp2,"%s",s)!=EOF)
words++;
fclose(fp2);
printf("%d words.\n",words);
char sendbuf[50];
sprintf(sendbuf,"%d",words);
send(new_server_socket_fd,sendbuf,50,0);
close(new_server_socket_fd);
}
close(server_socket_fd);
return 0;
}
client.c
#include<netinet/in.h> // sockaddr_in
#include<sys/types.h> // socket
#include<sys/socket.h> // socket
#include<stdio.h> // printf
#include<stdlib.h> // exit
#include<string.h> // bzero
#define SERVER_PORT 155323
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
#define BEGIN 1;
int main()
{
struct sockaddr_in client_addr;
bzero(&client_addr, sizeof(client_addr));
client_addr.sin_family = AF_INET;
client_addr.sin_addr.s_addr = htons(INADDR_ANY);
client_addr.sin_port = htons(0);
int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0);
if(client_socket_fd < 0)
{
perror("Create Socket Failed:");
exit(1);
}
if(-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr))))
{
perror("Client Bind Failed:");
exit(1);
}
struct sockaddr_in server_addr;
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
if(inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0)
{
perror("Server IP Address Error:");
exit(1);
}
server_addr.sin_port = htons(SERVER_PORT);
socklen_t server_addr_length = sizeof(server_addr);
if(connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0)
{
perror("Can Not Connect To Server IP:");
exit(0);
}
char file_name[FILE_NAME_MAX_SIZE+1];
bzero(file_name, FILE_NAME_MAX_SIZE+1);
printf("Please Input File Name On Client:\t");
scanf("%s", file_name);
char buffer[BUFFER_SIZE];
bzero(buffer, BUFFER_SIZE);
strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));
if(send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0)
{
perror("Send File Name Failed:");
exit(1);
}
FILE *fp = fopen(file_name, "r");
if(NULL == fp)
{
printf("File:%s Not Found\n", file_name);
}
else
{
bzero(buffer, BUFFER_SIZE);
int length = 0;
while((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
{
if(send(client_socket_fd, buffer, length, 0) < 0)
{
printf("Send File:%s Failed./n", file_name);
break;
}
bzero(buffer, BUFFER_SIZE);
}
fclose(fp);
printf("File:%s Transfer Successful!\n", file_name);
}
char s[50];
scanf("%s",s);
send(client_socket_fd,"OK",50,0);
char recvdata[sizeof(int)+1];
recv(client_socket_fd,recvdata,sizeof(int),0);
recvdata[sizeof(int)]=‘\0‘;
int words=atoi(recvdata);
close(client_socket_fd);
return 0;
}
結果截圖:
思考題
- 對比單線程的版本的性能,並分析原因。
原因:
多線程技術使程序的響應速度更快,因為用戶界面可以在進行其它工作的同時一直處於活動狀態;
當前沒有進行處理的任務時可以將處理器時間讓給其它任務;
占用大量處理時間的任務可以定期將處理器時間讓給其它任務;
可以隨時停止任務;
可以分別設置各個任務的優先級以優化性能。
- 是否需要創建多個線程取決於各種因素。在以下情況下,最適合采用多線程處理:
耗時或大量占用處理器的任務阻塞用戶界面操作;
各個任務必須等待外部資源 (如遠程文件或 Internet連接)。
2018-2019-1 《信息安全系統設計基礎》實驗三:並發程序