2018-2019-1 20165325 實驗五 通訊協議設計
阿新 • • 發佈:2018-12-16
實驗五 通訊協議設計
任務一 實驗五 通訊協議設計-1
任務要求
在Ubuntu中完成 http://www.cnblogs.com/rocedu/p/5087623.html 中的作業;
提交執行結果截圖。
實驗步驟
1、前往OpenSSL官網,選擇開啟OpenSSL原始碼下載地址,下載壓縮包檔案
這裡我用的是老師連結的OpenSSL最新版本;
2、使用unzip
命令解壓
3、安裝,命令如下:
$ ./config
$ make
$ make test
$ make install
時間略長,等待安裝完畢即可。
4、安裝完畢後編寫程式碼:
//test_openssl.c #include <stdio.h> #include <openssl/evp.h> int main(){ OpenSSL_add_all_algorithms(); return 0; }
編譯:gcc -o test_openssl test_openssl.c -L/usr/local/ssl/lib -lcrypto -ldl -lpthread
編譯後生成“test_openssl”檔案,執行:```echo $?````
此時輸出結果為0,表明安裝成功。
5、參考dalao學姐的部落格
編寫程式碼如下:
伺服器端:
//server.c #include<stdio.h> #include<stdlib.h> #include<string.h> #include<errno.h> #include<sys/types.h> #include<sys/socket.h> #include<netinet/in.h> #define DEFAULT_PORT 8000 #define MAXLINE 4096 int main(int argc, char** argv) { int socket_fd, connect_fd; struct sockaddr_in servaddr; char buff[4096]; int n; if( (socket_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ){ printf("create socket error: %s(errno: %d)\n",strerror(errno),errno); exit(0); } memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(DEFAULT_PORT); if( bind(socket_fd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1){ printf("bind socket error: %s(errno: %d)\n",strerror(errno),errno); exit(0); } if( listen(socket_fd, 10) == -1){ printf("listen socket error: %s(errno: %d)\n",strerror(errno),errno); exit(0); } printf("======waiting for client's request======\n"); while(1){ if( (connect_fd = accept(socket_fd, (struct sockaddr*)NULL, NULL)) == -1){ printf("accept socket error: %s(errno: %d)",strerror(errno),errno); continue; } n = recv(connect_fd, buff, MAXLINE, 0); if(!fork()){ if(send(connect_fd, "Hello,you are connected!\n", 26,0) == -1) perror("send error"); close(connect_fd); exit(0); } buff[n] = '\0'; printf("recv msg from client: %s\n", buff); close(connect_fd); } close(socket_fd); }
客戶端:
// client.c #include<stdio.h> #include<stdlib.h> #include<string.h> #include<errno.h> #include<sys/types.h> #include<sys/socket.h> #include<netinet/in.h> #define MAXLINE 4096 int main(int argc, char** argv) { int sockfd, n,rec_len; char recvline[4096], sendline[4096]; char buf[MAXLINE]; struct sockaddr_in servaddr; if( argc != 2){ printf("usage: ./client <ipaddress>\n"); exit(0); } if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){ printf("create socket error: %s(errno: %d)\n", strerror(errno),errno); exit(0); } memset(&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(8000); if( inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){ printf("inet_pton error for %s\n",argv[1]); exit(0); } if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0){ printf("connect error: %s(errno: %d)\n",strerror(errno),errno); exit(0); } printf("send msg to server: \n"); fgets(sendline, 4096, stdin); if( send(sockfd, sendline, strlen(sendline), 0) < 0) { printf("send msg error: %s(errno: %d)\n", strerror(errno), errno); exit(0); } if((rec_len = recv(sockfd, buf, MAXLINE,0)) == -1) { perror("recv error"); exit(1); } buf[rec_len] = '\0'; printf("Received : %s ",buf); close(sockfd); exit(0); }
執行結果:
任務二 實驗五 通訊協議設計-2
任務要求
在Ubuntu中實現對實驗二中的“wc伺服器”通過混合密碼系統進行防護;
提交測試截圖。
實驗步驟
1、繼續學習大佬的部落格,瞭解openSLL程式設計
編寫程式碼:
//server.c
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#define MAXBUF 1024
int main(int argc, char **argv)
{
int sockfd, new_fd;
socklen_t len;
struct sockaddr_in my_addr, their_addr;
unsigned int myport, lisnum;
char buf[MAXBUF + 1];
SSL_CTX *ctx;
if (argv[1])
myport = atoi(argv[1]);
else
myport = 7838;
if (argv[2])
lisnum = atoi(argv[2]);
else
lisnum = 2;
SSL_library_init();
OpenSSL_add_all_algorithms();
SSL_load_error_strings();
ctx = SSL_CTX_new(SSLv23_server_method());
if (ctx == NULL) {
ERR_print_errors_fp(stdout);
exit(1);
}
if (SSL_CTX_use_certificate_file(ctx, argv[3], SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stdout);
exit(1);
}
if (SSL_CTX_use_PrivateKey_file(ctx, argv[4], SSL_FILETYPE_PEM) <= 0){
ERR_print_errors_fp(stdout);
exit(1);
}
if (!SSL_CTX_check_private_key(ctx)) {
ERR_print_errors_fp(stdout);
exit(1);
}
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
} else
printf("socket created\n");
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = PF_INET;
my_addr.sin_port = htons(myport);
my_addr.sin_addr.s_addr = INADDR_ANY;
if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))
== -1) {
perror("bind");
exit(1);
} else
printf("binded\n");
if (listen(sockfd, lisnum) == -1) {
perror("listen");
exit(1);
} else
printf("begin listen\n");
while (1) {
SSL *ssl;
len = sizeof(struct sockaddr);
if ((new_fd =
accept(sockfd, (struct sockaddr *) &their_addr,
&len)) == -1) {
perror("accept");
exit(errno);
} else
printf("server: got connection from %s, port %d, socket %d\n",
inet_ntoa(their_addr.sin_addr),
ntohs(their_addr.sin_port), new_fd);
ssl = SSL_new(ctx);
SSL_set_fd(ssl, new_fd);
if (SSL_accept(ssl) == -1) {
perror("accept");
close(new_fd);
break;
}
bzero(buf, MAXBUF + 1);
strcpy(buf, "server->client");
len = SSL_write(ssl, buf, strlen(buf));
if (len <= 0) {
printf
("訊息'%s'傳送失敗!錯誤程式碼是%d,錯誤資訊是'%s'\n",
buf, errno, strerror(errno));
goto finish;
} else
printf("訊息'%s'傳送成功,共傳送了%d個位元組!\n",
buf, len);
bzero(buf, MAXBUF + 1);
len = SSL_read(ssl, buf, MAXBUF);
if (len > 0)
printf("接收訊息成功:'%s',共%d個位元組的資料\n",
buf, len);
else
printf
("訊息接收失敗!錯誤程式碼是%d,錯誤資訊是'%s'\n",
errno, strerror(errno));
finish:
SSL_shutdown(ssl);
SSL_free(ssl);
close(new_fd);
}
close(sockfd);
SSL_CTX_free(ctx);
return 0;
}
//telent.c
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#define MAXBUF 1024
void ShowCerts(SSL * ssl)
{
X509 *cert;
char *line;
cert = SSL_get_peer_certificate(ssl);
if (cert != NULL) {
printf("數字證書資訊:\n");
line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
printf("證書: %s\n", line);
free(line);
line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
printf("頒發者: %s\n", line);
free(line);
X509_free(cert);
} else
printf("無證書資訊!\n");
}
int main(int argc, char **argv)
{
int sockfd, len;
struct sockaddr_in dest;
char buffer[MAXBUF + 1];
SSL_CTX *ctx;
SSL *ssl;
if (argc != 3) {
printf("引數格式錯誤!正確用法如下:\n\t\t%s IP地址 埠\n\t比如:\t%s 127.0.0.1 80\n此程式用來從某個"
"IP 地址的伺服器某個埠接收最多 MAXBUF 個位元組的訊息",
argv[0], argv[0]);
exit(0);
}
//SSL 庫初始化
SSL_library_init();
OpenSSL_add_all_algorithms();
SSL_load_error_strings();
ctx = SSL_CTX_new(SSLv23_client_method());
if (ctx == NULL) {
ERR_print_errors_fp(stdout);
exit(1);
}
//建立一個 socket 用於 tcp 通訊
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("Socket");
exit(errno);
}
printf("socket created\n");
bzero(&dest, sizeof(dest));
dest.sin_family = AF_INET;
dest.sin_port = htons(atoi(argv[2]));
if (inet_aton(argv[1], (struct in_addr *) &dest.sin_addr.s_addr) == 0) {
perror(argv[1]);
exit(errno);
}
printf("address created\n");
//連線伺服器
if (connect(sockfd, (struct sockaddr *) &dest, sizeof(dest)) != 0) {
perror("Connect ");
exit(errno);
}
printf("server connected\n");
ssl = SSL_new(ctx);
SSL_set_fd(ssl, sockfd);
// 建立 SSL 連線
if (SSL_connect(ssl) == -1)
ERR_print_errors_fp(stderr);
else {
printf("Connected with %s encryption\n", SSL_get_cipher(ssl));
ShowCerts(ssl);
}
bzero(buffer, MAXBUF + 1);
len = SSL_read(ssl, buffer, MAXBUF);
if (len > 0)
printf("接收訊息成功:'%s',共%d個位元組的資料\n",
buffer, len);
else {
printf
("訊息接收失敗!錯誤程式碼是%d,錯誤資訊是'%s'\n",
errno, strerror(errno));
goto finish;
}
bzero(buffer, MAXBUF + 1);
strcpy(buffer, "from client->server");
len = SSL_write(ssl, buffer, strlen(buffer));
if (len < 0)
printf
("訊息'%s'傳送失敗!錯誤程式碼是%d,錯誤資訊是'%s'\n",
buffer, errno, strerror(errno));
else
printf("訊息'%s'傳送成功,共傳送了%d個位元組!\n",
buffer, len);
finish:
SSL_shutdown(ssl);
SSL_free(ssl);
close(sockfd);
SSL_CTX_free(ctx);
return 0;
}
執行結果: