Show ssl.c syntax highlighted
#include <stdio.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#define CHK_NULL(x) if ((x)==NULL) exit (1)
#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }
int main ()
{
int err;
int sd;
struct sockaddr_in sa;
SSL_CTX* ctx;
SSL* ssl;
X509* server_cert;
char* str;
char buf [4096];
SSL_METHOD *meth;
char *cmd;
SSLeay_add_ssl_algorithms();
meth = SSLv2_client_method();
SSL_load_error_strings();
ctx = SSL_CTX_new (meth); CHK_NULL(ctx);
CHK_SSL(err);
/* ----------------------------------------------- */
/* Create a socket and connect to server using normal socket calls. */
sd = socket (AF_INET, SOCK_STREAM, 0); CHK_ERR(sd, "socket");
memset (&sa, '\0', sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr ("128.223.142.39"); /* Server IP */
sa.sin_port = htons (993); /* Server Port number */
err = connect(sd, (struct sockaddr*) &sa,
sizeof(sa)); CHK_ERR(err, "connect");
/* ----------------------------------------------- */
/* Now we have TCP conncetion. Start SSL negotiation. */
ssl = SSL_new (ctx); CHK_NULL(ssl);
SSL_set_fd (ssl, sd);
err = SSL_connect (ssl); CHK_SSL(err);
/* Following two steps are optional and not required for
data exchange to be successful. */
/* Get the cipher - opt */
printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
/* Get server's certificate (note: beware of dynamic allocation) - opt */
server_cert = SSL_get_peer_certificate (ssl); CHK_NULL(server_cert);
printf ("Server certificate:\n");
str = X509_NAME_oneline (X509_get_subject_name (server_cert),0,0);
CHK_NULL(str);
printf ("\t subject: %s\n", str);
OPENSSL_free (str);
str = X509_NAME_oneline (X509_get_issuer_name (server_cert),0,0);
CHK_NULL(str);
printf ("\t issuer: %s\n", str);
OPENSSL_free (str);
/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */
X509_free (server_cert);
/* --------------------------------------------------- */
/* DATA EXCHANGE - Send a message and receive a reply. */
cmd = "1 logout\r\n";
err = SSL_write (ssl, cmd, strlen(cmd)); CHK_SSL(err);
buf[0] = 0;
err = SSL_read (ssl, buf, sizeof(buf) - 1); CHK_SSL(err);
buf[err] = '\0';
printf ("%s", buf);
SSL_shutdown (ssl); /* send SSL/TLS close_notify */
/* Clean up. */
close (sd);
SSL_free (ssl);
SSL_CTX_free (ctx);
return 0;
}
/* EOF - cli.cpp */
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