\/\/ SSL_Client.c
\/\/
\/\/ Copyright 2009 Kim Sung-tae <pchero21@gmail.com>
\/\/
\/\/ This program is free software; you can redistribute it and\/or modify
\/\/ it under the terms of the GNU General Public License as published by
\/\/ the Free Software Foundation; either version 2 of the License, or
\/\/ (at your option) any later version.
\/\/
\/\/ This program is distributed in the hope that it will be useful,
\/\/ but WITHOUT ANY WARRANTY; without even the implied warranty of
\/\/ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\/\/ GNU General Public License for more details.
\/\/
\/\/ You should have received a copy of the GNU General Public License
\/\/ along with this program; if not, write to the Free Software
\/\/ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
\/\/ MA 02110-1301, USA.<\/p>\n
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <netdb.h><\/p>\n
#include <openssl\/bio.h>
#include <openssl\/err.h>
#include <openssl\/rand.h>
#include <openssl\/crypto.h>
#include <openssl\/evp.h>
#include <openssl\/ssl.h><\/p>\n
#include <sys\/socket.h>
#include <sys\/stat.h>
#include <sys\/types.h>
#include <fcntl.h>
#include <arpa\/inet.h><\/p>\n
#define PORT 7921
#define SERVER_ADDRESS “127.0.0.1”<\/p>\n
int main(int argc, char** argv)
{
char *server_name = SERVER_ADDRESS;
unsigned short port = PORT;
unsigned int addr;
struct sockaddr_in server_add;
struct hostent *host;
int conn_socket;
int socket_type = SOCK_STREAM;
int retval;
char *retString = NULL;
const char *currentCipher;
char buffer[1000];
char message[100] = “\uc774\uac83\uc740 \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 \ubcf4\ub0b4\ub294 \uba54\uc2dc\uc9c0\uc785\ub2c8\ub2e4.”;
\/\/ SSL \uad6c\uc870\uccb4 \uc0dd\uc131
SSL_METHOD *meth;
SSL_CTX *ctx;
SSL *ssl;
X509 *server_cert;
BIO *errBIO;
if((errBIO = BIO_new(BIO_s_file())) != NULL)
BIO_set_fp(errBIO, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
meth = SSLv3_method();
ctx = SSL_CTX_new(meth);
if(ctx == NULL) {
BIO_printf(errBIO, “SSL_CTX \uc0dd\uc131 \uc5d0\ub7ec”);
ERR_print_errors(errBIO);
exit(1);
}
\/\/ \uc11c\ubc84 \uc774\ub984\uc774 \uc54c\ud30c\ubcb3\uc778 DNS\ub85c \ub418\uc5b4 \uc788\uc744 \uacbd\uc6b0
if(isalpha(server_name[0])) {
host = gethostbyname(server_name);
}
\/\/ \uc11c\ubc84 \uc774\ub984\uc774 IP \ub85c \ub418\uc5b4 \uc788\uc744 \uacbd\uc6b0
else {
addr = inet_addr(server_name);
host = gethostbyaddr((char *)&addr, 4, AF_INET);
}
if(host == NULL) {
fprintf(stderr, “\uc54c \uc218 \uc5c6\ub294 \uc8fc\uc18c[%s] \uc785\ub2c8\ub2e4!n”, server_name);
exit(1);
}
memset(&server_add, 0, sizeof(server_add));
memcpy(&(server_add.sin_addr), host->h_addr, host->h_length);
server_add.sin_family = host->h_addrtype;
server_add.sin_port = htons(port);
conn_socket = socket(AF_INET, socket_type, 0);
if(conn_socket < 0) {
fprintf(stderr, “\uc18c\ucf13 \uc0dd\uc131 \uc5d0\ub7ec!n”);
exit(1);
}
printf(“[%s] \uc11c\ubc84\uc5d0 \uc5f0\uacb0\uc911…n”, server_name);
if(connect(conn_socket, (struct sockaddr*)&server_add, sizeof(server_add)) == -1) {
fprintf(stderr, “connect \uc5d0\ub7ec!n”);
exit(1);
}
\/\/ \uc138\uc158 \ud0a4\ub97c \ub9cc\ub4e4\uae30 \uc704\ud55c \ub79c\ub364 \uc218\ub97c \uc704\ud55c Seed \uacf5\uae09
printf(“\ub79c\ub364 \uc218 \uc0dd\uc131\uc911…n”);
RAND_status();
printf(“\ub79c\ub364 \uc218 \uc0dd\uc131 \uc644\ub8cc!b”);
ssl = SSL_new(ctx);
if(ssl == NULL) {
BIO_printf(errBIO, “SSL \uc0dd\uc131 \uc5d0\ub7ec!n”);
ERR_print_errors(errBIO);
exit(1);
}
SSL_set_fd(ssl, conn_socket);
retval = SSL_connect(ssl);
if(retval == -1) {
BIO_printf(errBIO, “SSL connect \uc5d0\ub7ec!n”);
ERR_print_errors(errBIO);
exit(1);
}
currentCipher = SSL_CIPHER_get_name(SSL_get_current_cipher(ssl));
printf(“SSL \uc5f0\uacb0, \uc0ac\uc6a9 \uc54c\uace0\ub9ac\uc998 \ud30c\ub77c\uba54\ud130: [%s]n”, currentCipher);
server_cert = SSL_get_peer_certificate(ssl);
if(server_cert == NULL) {
BIO_printf(errBIO, “\uc11c\ubc84 \uc778\uc99d\uc11c\ub97c \ubc1b\uc744 \uc218 \uc5c6\uc74c.”);
ERR_print_errors(errBIO);
exit(1);
}
printf(“Server certificate:n”);
retString = NULL;
\/\/ \uc8fc\uccb4\uc758 DN\uc744 \ubb38\uc790\uc5f4\ub85c \uc5bb\uc74c
retString = X509_NAME_oneline(X509_get_subject_name(server_cert), 0, 0);
if(retString == NULL) {
BIO_printf(errBIO, “\uc11c\ubc84 \uc778\uc99d\uc11c\uc5d0\uc11c \uc8fc\uccb4\uc758 DN\uc744 \uc77d\uc744 \uc218 \uc5c6\uc74c.”);
ERR_print_errors(errBIO);
exit(1);
}
printf(“t subject: %sn”, retString);
free(retString);
\/\/ \ubc1c\uae09\uc790\uc758 DN\uc744 \ubb38\uc790\uc5f4\ub85c \uc5bb\uc74c
retString = X509_NAME_oneline(X509_get_issuer_name(server_cert), 0, 0);
if(retString == NULL) {
BIO_printf(errBIO, “\uc11c\ubc84 \uc778\uc99d\uc11c\uc5d0\uc11c \ubc1c\uae09\uc790\uc758 DN\uc744 \uc77d\uc744 \uc218 \uc5c6\uc74c.”);
ERR_print_errors(errBIO);
exit(1);
}
printf(“t issuer: %sn”, retString);
free(retString);
X509_free(server_cert);
retval = SSL_write(ssl, “hi!!_from client”, strlen(“hi!!_from client”));
if(retval == -1) {
BIO_printf(errBIO, “SSL write \uc5d0\ub7ec!n”);
ERR_print_errors(errBIO);
exit(1);
}
retval = SSL_read(ssl, buffer, sizeof(buffer) – 1);
if(retval == -1) {
BIO_printf(errBIO, “SSL read \uc5d0\ub7ec!n”);
ERR_print_errors(errBIO);
exit(1);
}
buffer[retval] = ‘\u0000’;
printf(“\uc11c\ubc84\ub85c\ubd80\ud130 \ub370\uc774\ud130 \uc804\uc1a1: [%s], \uae38\uc774:%dn”, buffer, retval);
SSL_shutdown(ssl);
close(conn_socket);
SSL_free(ssl);
SSL_CTX_free(ctx);
return 0;
}
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\/\/ SSL_Client.c\/\/ \/\/ Copyright 2009 Kim Sung-tae <pchero21@gmail.com>\/\/ \/\/ This program is free software; you can redistribute it and\/or modify\/\/ it under the terms of the GNU General … Continue reading