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saccept.c

/* NOCW */
/* demos/bio/saccept.c */

/* A minimal program to server an SSL connection.
 * It uses blocking.
 * saccept host:port
 * host is the interface IP to use.  If any interface, use *:port
 * The default it *:4433
 *
 * cc -I../../include saccept.c -L../.. -lssl -lcrypto
 */

#include <stdio.h>
#include <signal.h>
#include <openssl/err.h>
#include <openssl/ssl.h>

#define CERT_FILE "server.pem"

BIO *in=NULL;

void close_up()
      {
      if (in != NULL)
            BIO_free(in);
      }

int main(argc,argv)
int argc;
char *argv[];
      {
      char *port=NULL;
      BIO *ssl_bio,*tmp;
      SSL_CTX *ctx;
      SSL *ssl;
      char buf[512];
      int ret=1,i;

        if (argc <= 1)
            port="*:4433";
      else
            port=argv[1];

      signal(SIGINT,close_up);

      SSL_load_error_strings();

#ifdef WATT32
      dbug_init();
      sock_init();
#endif

      /* Add ciphers and message digests */
      OpenSSL_add_ssl_algorithms();

      ctx=SSL_CTX_new(SSLv23_server_method());
      if (!SSL_CTX_use_certificate_file(ctx,CERT_FILE,SSL_FILETYPE_PEM))
            goto err;
      if (!SSL_CTX_use_PrivateKey_file(ctx,CERT_FILE,SSL_FILETYPE_PEM))
            goto err;
      if (!SSL_CTX_check_private_key(ctx))
            goto err;

      /* Setup server side SSL bio */
      ssl=SSL_new(ctx);
      ssl_bio=BIO_new_ssl(ctx,0);

      if ((in=BIO_new_accept(port)) == NULL) goto err;

      /* This means that when a new connection is acceptede on 'in',
       * The ssl_bio will be 'dupilcated' and have the new socket
       * BIO push into it.  Basically it means the SSL BIO will be
       * automatically setup */
      BIO_set_accept_bios(in,ssl_bio);

again:
      /* The first call will setup the accept socket, and the second
       * will get a socket.  In this loop, the first actual accept
       * will occur in the BIO_read() function. */

      if (BIO_do_accept(in) <= 0) goto err;

      for (;;)
            {
            i=BIO_read(in,buf,512);
            if (i == 0)
                  {
                  /* If we have finished, remove the underlying
                   * BIO stack so the next time we call any function
                   * for this BIO, it will attempt to do an
                   * accept */
                  printf("Done\n");
                  tmp=BIO_pop(in);
                  BIO_free_all(tmp);
                  goto again;
                  }
            if (i < 0) goto err;
            fwrite(buf,1,i,stdout);
            fflush(stdout);
            }

      ret=0;
err:
      if (ret)
            {
            ERR_print_errors_fp(stderr);
            }
      if (in != NULL) BIO_free(in);
      exit(ret);
      return(!ret);
      }


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