110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/* cli.cpp - Minimal ssleay client for Unix
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30.9.1996, Sampo Kellomaki <sampo@iki.fi> */
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/* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b
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Simplified to be even more minimal
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12/98 - 4/99 Wade Scholine <wades@mail.cybg.com> */
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#include <stdio.h>
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#include <memory.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <openssl/crypto.h>
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#include <openssl/x509.h>
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#include <openssl/pem.h>
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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#define CHK_NULL(x) if ((x)==NULL) exit (1)
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#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
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#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }
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void main ()
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{
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int err;
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int sd;
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struct sockaddr_in sa;
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SSL_CTX* ctx;
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SSL* ssl;
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X509* server_cert;
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char* str;
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char buf [4096];
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SSL_METHOD *meth;
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SSLeay_add_ssl_algorithms();
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meth = SSLv2_client_method();
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SSL_load_error_strings();
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ctx = SSL_CTX_new (meth); CHK_NULL(ctx);
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CHK_SSL(err);
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/* ----------------------------------------------- */
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/* Create a socket and connect to server using normal socket calls. */
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sd = socket (AF_INET, SOCK_STREAM, 0); CHK_ERR(sd, "socket");
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memset (&sa, '\0', sizeof(sa));
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sa.sin_family = AF_INET;
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sa.sin_addr.s_addr = inet_addr ("127.0.0.1"); /* Server IP */
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sa.sin_port = htons (1111); /* Server Port number */
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err = connect(sd, (struct sockaddr*) &sa,
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sizeof(sa)); CHK_ERR(err, "connect");
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/* ----------------------------------------------- */
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/* Now we have TCP conncetion. Start SSL negotiation. */
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ssl = SSL_new (ctx); CHK_NULL(ssl);
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SSL_set_fd (ssl, sd);
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err = SSL_connect (ssl); CHK_SSL(err);
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/* Following two steps are optional and not required for
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data exchange to be successful. */
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/* Get the cipher - opt */
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printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
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/* Get server's certificate (note: beware of dynamic allocation) - opt */
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server_cert = SSL_get_peer_certificate (ssl); CHK_NULL(server_cert);
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printf ("Server certificate:\n");
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str = X509_NAME_oneline (X509_get_subject_name (server_cert),0,0);
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CHK_NULL(str);
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printf ("\t subject: %s\n", str);
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OPENSSL_free (str);
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str = X509_NAME_oneline (X509_get_issuer_name (server_cert),0,0);
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CHK_NULL(str);
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printf ("\t issuer: %s\n", str);
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OPENSSL_free (str);
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/* We could do all sorts of certificate verification stuff here before
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deallocating the certificate. */
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X509_free (server_cert);
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/* --------------------------------------------------- */
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/* DATA EXCHANGE - Send a message and receive a reply. */
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err = SSL_write (ssl, "Hello World!", strlen("Hello World!")); CHK_SSL(err);
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err = SSL_read (ssl, buf, sizeof(buf) - 1); CHK_SSL(err);
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buf[err] = '\0';
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printf ("Got %d chars:'%s'\n", err, buf);
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SSL_shutdown (ssl); /* send SSL/TLS close_notify */
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/* Clean up. */
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close (sd);
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SSL_free (ssl);
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SSL_CTX_free (ctx);
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}
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/* EOF - cli.cpp */
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