CC=cc
CFLAGS= -g -I../../include
-LIBS= -L../.. ../../libssl.a ../../libcrypto.a
-EXAMPLES=saccept sconnect
+LIBS= -L../.. ../../libssl.a ../../libcrypto.a -ldl
+EXAMPLES=saccept sconnect client-arg client-conf
all: $(EXAMPLES)
sconnect: sconnect.o
$(CC) -o sconnect sconnect.o $(LIBS)
+client-arg: client-arg.o
+ $(CC) -o client-arg client-arg.o $(LIBS)
+
+client-conf: client-conf.o
+ $(CC) -o client-conf client-conf.o $(LIBS)
+
clean:
rm -f $(EXAMPLES) *.o
This directory contains some simple examples of the use of BIO's
to simplify socket programming.
+The client-conf and client-arg include examples of how to use the SSL_CONF
+API for configuration file or command line processing.
+
--- /dev/null
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+
+int main(int argc, char **argv)
+ {
+ BIO *sbio = NULL, *out = NULL;
+ int len;
+ char tmpbuf[1024];
+ SSL_CTX *ctx;
+ SSL_CONF_CTX *cctx;
+ SSL *ssl;
+ char **args = argv + 1;
+ const char *connect_str = "localhost:4433";
+ int nargs = argc - 1;
+
+ ERR_load_crypto_strings();
+ ERR_load_SSL_strings();
+ SSL_library_init();
+
+ ctx = SSL_CTX_new(SSLv23_client_method());
+ cctx = SSL_CONF_CTX_new();
+ SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
+ SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
+ while(*args && **args == '-')
+ {
+ int rv;
+ /* Parse standard arguments */
+ rv = SSL_CONF_cmd_argv(cctx, &nargs, &args);
+ if (rv == -3)
+ {
+ fprintf(stderr, "Missing argument for %s\n", *args);
+ goto end;
+ }
+ if (rv < 0)
+ {
+ fprintf(stderr, "Error in command %s\n", *args);
+ ERR_print_errors_fp(stderr);
+ goto end;
+ }
+ /* If rv > 0 we processed something so proceed to next arg */
+ if (rv > 0)
+ continue;
+ /* Otherwise application specific argument processing */
+ if (!strcmp(*args, "-connect"))
+ {
+ connect_str = args[1];
+ if (connect_str == NULL)
+ {
+ fprintf(stderr, "Missing -connect argument\n");
+ goto end;
+ }
+ args += 2;
+ nargs -= 2;
+ continue;
+ }
+ else
+ {
+ fprintf(stderr, "Unknown argument %s\n", *args);
+ goto end;
+ }
+ }
+
+ /* We'd normally set some stuff like the verify paths and
+ * mode here because as things stand this will connect to
+ * any server whose certificate is signed by any CA.
+ */
+
+ sbio = BIO_new_ssl_connect(ctx);
+
+ BIO_get_ssl(sbio, &ssl);
+
+ if(!ssl)
+ {
+ fprintf(stderr, "Can't locate SSL pointer\n");
+ goto end;
+ }
+
+ /* Don't want any retries */
+ SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
+
+ /* We might want to do other things with ssl here */
+
+ BIO_set_conn_hostname(sbio, connect_str);
+
+ out = BIO_new_fp(stdout, BIO_NOCLOSE);
+ if(BIO_do_connect(sbio) <= 0)
+ {
+ fprintf(stderr, "Error connecting to server\n");
+ ERR_print_errors_fp(stderr);
+ goto end;
+ }
+
+ if(BIO_do_handshake(sbio) <= 0)
+ {
+ fprintf(stderr, "Error establishing SSL connection\n");
+ ERR_print_errors_fp(stderr);
+ goto end;
+ }
+
+ /* Could examine ssl here to get connection info */
+
+ BIO_puts(sbio, "GET / HTTP/1.0\n\n");
+ for(;;)
+ {
+ len = BIO_read(sbio, tmpbuf, 1024);
+ if(len <= 0) break;
+ BIO_write(out, tmpbuf, len);
+ }
+ end:
+ SSL_CONF_CTX_free(cctx);
+ BIO_free_all(sbio);
+ BIO_free(out);
+ return 0;
+ }
+
--- /dev/null
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+#include <openssl/conf.h>
+
+int main(int argc, char **argv)
+ {
+ BIO *sbio = NULL, *out = NULL;
+ int i, len, rv;
+ char tmpbuf[1024];
+ SSL_CTX *ctx = NULL;
+ SSL_CONF_CTX *cctx = NULL;
+ SSL *ssl = NULL;
+ CONF *conf = NULL;
+ STACK_OF(CONF_VALUE) *sect = NULL;
+ CONF_VALUE *cnf;
+ const char *connect_str = "localhost:4433";
+ long errline = -1;
+
+ ERR_load_crypto_strings();
+ ERR_load_SSL_strings();
+ SSL_library_init();
+
+ conf = NCONF_new(NULL);
+
+ if (NCONF_load(conf, "connect.cnf", &errline) <= 0)
+ {
+ if (errline <= 0)
+ fprintf(stderr, "Error processing config file\n");
+ else
+ fprintf(stderr, "Error on line %ld\n", errline);
+ goto end;
+ }
+
+ sect = NCONF_get_section(conf, "default");
+
+ if (sect == NULL)
+ {
+ fprintf(stderr, "Error retrieving default section\n");
+ goto end;
+ }
+
+ ctx = SSL_CTX_new(SSLv23_client_method());
+ cctx = SSL_CONF_CTX_new();
+ SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
+ SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
+ SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
+ for (i = 0; i < sk_CONF_VALUE_num(sect); i++)
+ {
+ cnf = sk_CONF_VALUE_value(sect, i);
+ rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
+ if (rv > 0)
+ continue;
+ if (rv != -2)
+ {
+ fprintf(stderr, "Error processing %s = %s\n",
+ cnf->name, cnf->value);
+ ERR_print_errors_fp(stderr);
+ goto end;
+ }
+ if (!strcmp(cnf->name, "Connect"))
+ {
+ connect_str = cnf->value;
+ }
+ else
+ {
+ fprintf(stderr, "Unknown configuration option %s\n",
+ cnf->name);
+ goto end;
+ }
+ }
+
+ /* We'd normally set some stuff like the verify paths and
+ * mode here because as things stand this will connect to
+ * any server whose certificate is signed by any CA.
+ */
+
+ sbio = BIO_new_ssl_connect(ctx);
+
+ BIO_get_ssl(sbio, &ssl);
+
+ if(!ssl)
+ {
+ fprintf(stderr, "Can't locate SSL pointer\n");
+ goto end;
+ }
+
+ /* Don't want any retries */
+ SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
+
+ /* We might want to do other things with ssl here */
+
+ BIO_set_conn_hostname(sbio, connect_str);
+
+ out = BIO_new_fp(stdout, BIO_NOCLOSE);
+ if(BIO_do_connect(sbio) <= 0)
+ {
+ fprintf(stderr, "Error connecting to server\n");
+ ERR_print_errors_fp(stderr);
+ goto end;
+ }
+
+ if(BIO_do_handshake(sbio) <= 0)
+ {
+ fprintf(stderr, "Error establishing SSL connection\n");
+ ERR_print_errors_fp(stderr);
+ goto end;
+ }
+
+ /* Could examine ssl here to get connection info */
+
+ BIO_puts(sbio, "GET / HTTP/1.0\n\n");
+ for(;;)
+ {
+ len = BIO_read(sbio, tmpbuf, 1024);
+ if(len <= 0) break;
+ BIO_write(out, tmpbuf, len);
+ }
+ end:
+ SSL_CONF_CTX_free(cctx);
+ BIO_free_all(sbio);
+ BIO_free(out);
+ NCONF_free(conf);
+ return 0;
+ }
+
--- /dev/null
+# Example configuration file
+# Connects to the default port of s_server
+Connect = localhost:4433
+# Disable TLS v1.2 for test.
+# Protocol = ALL, -TLSv1.2
+# Only support 3 curves
+Curves = P-521:P-384:P-256
+# Restricted signature algorithms
+SignatureAlgorithms = RSA+SHA512:ECDSA+SHA512
projects / openssl.git / commitdiff