A local copy of OpenSSL from GitHub
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/* serv.cpp - Minimal ssleay server for Unix
30.9.1996, Sampo Kellomaki <sampo@iki.fi> */
#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/rsa.h> /* SSLeay stuff */
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#define HOME "/usr/users/sampo/sibs/tim/"
#define CERTF HOME "plain-cert.pem"
#define KEYF HOME "plain-key.pem"
#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); }
void main ()
int err;
int listen_sd;
int sd;
struct sockaddr_in sa_serv;
struct sockaddr_in sa_cli;
int client_len;
SSL_CTX* ctx;
SSL* ssl;
X509* client_cert;
char* str;
char buf [4096];
/* SSL preliminaries. We keep the certificate and key with the context. */
ctx = SSL_CTX_new (); CHK_NULL(ctx);
err = SSL_CTX_use_RSAPrivateKey_file (ctx, KEYF, SSL_FILETYPE_PEM);
err = SSL_CTX_use_certificate_file (ctx, CERTF, SSL_FILETYPE_PEM);
/* ----------------------------------------------- */
/* Prepare TCP socket for receiving connections */
listen_sd = socket (AF_INET, SOCK_STREAM, 0); CHK_ERR(listen_sd, "socket");
memset (&sa_serv, '\0', sizeof(sa_serv));
sa_serv.sin_family = AF_INET;
sa_serv.sin_addr.s_addr = INADDR_ANY;
sa_serv.sin_port = htons (1111); /* Server Port number */
err = bind(listen_sd, (struct sockaddr*) &sa_serv,
sizeof (sa_serv)); CHK_ERR(err, "bind");
/* Receive a TCP connection. */
err = listen (listen_sd, 5); CHK_ERR(err, "listen");
client_len = sizeof(sa_cli);
sd = accept (listen_sd, (struct sockaddr*) &sa_cli, &client_len);
CHK_ERR(sd, "accept");
close (listen_sd);
printf ("Connection from %lx, port %x\n",
sa_cli.sin_addr.s_addr, sa_cli.sin_port);
/* ----------------------------------------------- */
/* TCP connection is ready. Do server side SSL. */
ssl = SSL_new (ctx); CHK_NULL(ssl);
SSL_set_fd (ssl, sd);
err = SSL_accept (ssl); CHK_SSL(err);
/* Get the cipher - opt */
printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
/* Get client's certificate (note: beware of dynamic allocation) - opt */
client_cert = SSL_get_peer_certificate (ssl);
if (client_cert != NULL) {
printf ("Client certificate:\n");
str = X509_NAME_oneline (X509_get_subject_name (client_cert));
printf ("\t subject: %s\n", str);
Free (str);
str = X509_NAME_oneline (X509_get_issuer_name (client_cert));
printf ("\t issuer: %s\n", str);
Free (str);
/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */
X509_free (client_cert);
} else
printf ("Client does not have certificate.\n");
/* DATA EXCHANGE - Receive message and send reply. */
err = SSL_read (ssl, buf, sizeof(buf) - 1); CHK_SSL(err);
buf[err] = '\0';
printf ("Got %d chars:'%s'\n", err, buf);
err = SSL_write (ssl, "I hear you.", strlen("I hear you.")); CHK_SSL(err);
/* Clean up. */
close (sd);
SSL_free (ssl);
SSL_CTX_free (ctx);
/* EOF - serv.cpp */