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client.c
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client.c
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#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <malloc.h>
#include <string.h>
#include <sys/socket.h>
#include <resolv.h>
#include <netdb.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#define FAIL -1
intOpenConnection(constchar*hostname,intport)
{ intsd;
structhostent *host;
structsockaddr_in addr;
if( (host = gethostbyname(hostname)) == NULL )
{
printf('Eroor: %s\n',hostname);
perror(hostname);
abort();
}
sd = socket(PF_INET, SOCK_STREAM, 0);
bzero(&addr,sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = *(long*)(host->h_addr);
if( connect(sd, (structsockaddr*)&addr,sizeof(addr)) != 0 )
{
close(sd);
perror(hostname);
abort();
}
returnsd;
}
SSL_CTX* InitCTX(void)
{ SSL_METHOD *method;
SSL_CTX *ctx;
OpenSSL_add_all_algorithms(); /* Load cryptos, et.al. */
SSL_load_error_strings(); /* Bring in and register error messages */
method = SSLv3_client_method(); /* Create new client-method instance */
ctx = SSL_CTX_new(method); /* Create new context */
if( ctx == NULL )
{
ERR_print_errors_fp(stderr);
printf('Eroor: %s\n',stderr);
abort();
}
return ctx;
}
void ShowCerts(SSL* ssl)
{ X509 *cert;
char*line;
cert = SSL_get_peer_certificate(ssl);/* get the server's certificate */
if( cert != NULL )
{
printf("Server certificates:\n");
line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
printf("Subject: %s\n", line);
free(line); /* free the malloc'ed string */
line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
printf("Issuer: %s\n", line);
free(line); /* free the malloc'ed string */
X509_free(cert); /* free the malloc'ed certificate copy */
}
else
printf("No certificates.\n");
}
int main(int count,char* strings[]){
SSL_CTX *ctx;
int server;
SSL *ssl;
char buf[1024];
int bytes;
char *hostname, *portnum;
if( count != 3 )
{
printf("usage: %s <hostname> <portnum>\n", strings[0]);
exit(0);
}
SSL_library_init();
hostname=strings[1];
portnum=strings[2];
ctx = InitCTX();
server = OpenConnection(hostname,atoi(portnum));
ssl = SSL_new(ctx); /* create new SSL connection state */
SSL_set_fd(ssl, server); /* attach the socket descriptor */
if( SSL_connect(ssl) == FAIL ) /* perform the connection */
{
printf('Eroor: %s\n',stderr);
ERR_print_errors_fp(stderr);
}
else
{ char*msg ="HelloWorld";
printf("Connected with %s encryption\n", SSL_get_cipher(ssl));
ShowCerts(ssl); /* get any certs */
SSL_write(ssl, msg,strlen(msg)); /* encrypt & send message */
bytes = SSL_read(ssl, buf,sizeof(buf));/* get reply & decrypt */
buf[bytes] = 0;
printf("Received: \"%s\"\n", buf);
SSL_free(ssl); /* release connection state */
}
close(server); /* close socket */
SSL_CTX_free(ctx); /* release context */
return 0;
}