/* cli.cpp - Minimal ssleay client for Unix 30.9.1996, Sampo Kellomaki */ /* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b Simplified to be even more minimal 12/98 - 4/99 Wade Scholine */ #include #include #include #include #include #include #include #include #include #include #include #include #include #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 sd; struct sockaddr_in sa; SSL_CTX* ctx; SSL* ssl; X509* server_cert; char* str; char buf [4096]; SSL_METHOD *meth; SSLeay_add_ssl_algorithms(); meth = SSLv23_client_method(); SSL_load_error_strings(); ctx = SSL_CTX_new (meth); CHK_NULL(ctx); /* ----------------------------------------------- */ /* 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 ("127.0.0.1"); /* Server IP */ sa.sin_port = htons (1111); /* 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. */ err = SSL_write (ssl, "Hello World!", strlen("Hello World!")); CHK_SSL(err); err = SSL_read (ssl, buf, sizeof(buf) - 1); CHK_SSL(err); buf[err] = '\0'; printf ("Got %d chars:'%s'\n", err, buf); SSL_shutdown (ssl); /* send SSL/TLS close_notify */ /* Clean up. */ close (sd); SSL_free (ssl); SSL_CTX_free (ctx); } /* EOF - cli.cpp */