demos/ssl/cli.cpp

   1 /* cli.cpp  -  Minimal ssleay client for Unix
   2    30.9.1996, Sampo Kellomaki <sampo@iki.fi> */
   3
   4 /* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b
   5    Simplified to be even more minimal
   6    12/98 - 4/99 Wade Scholine <wades@mail.cybg.com> */
   7
   8 #include <stdio.h>
   9 #include <memory.h>
  10 #include <errno.h>
  11 #include <sys/types.h>
  12 #include <sys/socket.h>
  13 #include <netinet/in.h>
  14 #include <arpa/inet.h>
  15 #include <netdb.h>
  16
  17 #include <openssl/crypto.h>
  18 #include <openssl/x509.h>
  19 #include <openssl/pem.h>
  20 #include <openssl/ssl.h>
  21 #include <openssl/err.h>
  22
  23
  24 #define CHK_NULL(x) if ((x)==NULL) exit (1)
  25 #define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
  26 #define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }
  27
  28 void main ()
  29 {
  30   int err;
  31   int sd;
  32   struct sockaddr_in sa;
  33   SSL_CTX* ctx;
  34   SSL*     ssl;
  35   X509*    server_cert;
  36   char*    str;
  37   char     buf [4096];
  38   SSL_METHOD *meth;
  39
  40   SSLeay_add_ssl_algorithms();
  41   meth = SSLv23_client_method();
  42   SSL_load_error_strings();
  43   ctx = SSL_CTX_new (meth);                        CHK_NULL(ctx);
  44
  45   /* ----------------------------------------------- */
  46   /* Create a socket and connect to server using normal socket calls. */
  47
  48   sd = socket (AF_INET, SOCK_STREAM, 0);       CHK_ERR(sd, "socket");
  49
  50   memset (&sa, '\0', sizeof(sa));
  51   sa.sin_family      = AF_INET;
  52   sa.sin_addr.s_addr = inet_addr ("127.0.0.1");   /* Server IP */
  53   sa.sin_port        = htons     (1111);          /* Server Port number */
  54
  55   err = connect(sd, (struct sockaddr*) &sa,
  56                 sizeof(sa));                   CHK_ERR(err, "connect");
  57
  58   /* ----------------------------------------------- */
  59   /* Now we have TCP conncetion. Start SSL negotiation. */
  60
  61   ssl = SSL_new (ctx);                         CHK_NULL(ssl);
  62   SSL_set_fd (ssl, sd);
  63   err = SSL_connect (ssl);                     CHK_SSL(err);
  64
  65   /* Following two steps are optional and not required for
  66      data exchange to be successful. */
  67
  68   /* Get the cipher - opt */
  69
  70   printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
  71
  72   /* Get server's certificate (note: beware of dynamic allocation) - opt */
  73
  74   server_cert = SSL_get_peer_certificate (ssl);       CHK_NULL(server_cert);
  75   printf ("Server certificate:\n");
  76
  77   str = X509_NAME_oneline (X509_get_subject_name (server_cert),0,0);
  78   CHK_NULL(str);
  79   printf ("\t subject: %s\n", str);
  80   OPENSSL_free (str);
  81
  82   str = X509_NAME_oneline (X509_get_issuer_name  (server_cert),0,0);
  83   CHK_NULL(str);
  84   printf ("\t issuer: %s\n", str);
  85   OPENSSL_free (str);
  86
  87   /* We could do all sorts of certificate verification stuff here before
  88      deallocating the certificate. */
  89
  90   X509_free (server_cert);
  91
  92   /* --------------------------------------------------- */
  93   /* DATA EXCHANGE - Send a message and receive a reply. */
  94
  95   err = SSL_write (ssl, "Hello World!", strlen("Hello World!"));  CHK_SSL(err);
  96
  97   err = SSL_read (ssl, buf, sizeof(buf) - 1);                     CHK_SSL(err);
  98   buf[err] = '\0';
  99   printf ("Got %d chars:'%s'\n", err, buf);
 100   SSL_shutdown (ssl);  /* send SSL/TLS close_notify */
 101
 102   /* Clean up. */
 103
 104   close (sd);
 105   SSL_free (ssl);
 106   SSL_CTX_free (ctx);
 107 }
 108 /* EOF - cli.cpp */