client-conf.c revision 1.1.1.3 
1/*
2 * Copyright 2013-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <string.h>
11#include <openssl/err.h>
12#include <openssl/ssl.h>
13#include <openssl/conf.h>
14
15int main(int argc, char **argv)
16{
17    BIO *sbio = NULL, *out = NULL;
18    int i, len, rv;
19    char tmpbuf[1024];
20    SSL_CTX *ctx = NULL;
21    SSL_CONF_CTX *cctx = NULL;
22    SSL *ssl = NULL;
23    CONF *conf = NULL;
24    STACK_OF(CONF_VALUE) *sect = NULL;
25    CONF_VALUE *cnf;
26    const char *connect_str = "localhost:4433";
27    long errline = -1;
28
29    conf = NCONF_new(NULL);
30
31    if (NCONF_load(conf, "connect.cnf", &errline) <= 0) {
32        if (errline <= 0)
33            fprintf(stderr, "Error processing config file\n");
34        else
35            fprintf(stderr, "Error on line %ld\n", errline);
36        goto end;
37    }
38
39    sect = NCONF_get_section(conf, "default");
40
41    if (sect == NULL) {
42        fprintf(stderr, "Error retrieving default section\n");
43        goto end;
44    }
45
46    ctx = SSL_CTX_new(TLS_client_method());
47    cctx = SSL_CONF_CTX_new();
48    SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
49    SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
50    SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
51    for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
52        cnf = sk_CONF_VALUE_value(sect, i);
53        rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
54        if (rv > 0)
55            continue;
56        if (rv != -2) {
57            fprintf(stderr, "Error processing %s = %s\n",
58                    cnf->name, cnf->value);
59            ERR_print_errors_fp(stderr);
60            goto end;
61        }
62        if (strcmp(cnf->name, "Connect") == 0) {
63            connect_str = cnf->value;
64        } else {
65            fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
66            goto end;
67        }
68    }
69
70    if (!SSL_CONF_CTX_finish(cctx)) {
71        fprintf(stderr, "Finish error\n");
72        ERR_print_errors_fp(stderr);
73        goto end;
74    }
75
76    /*
77     * We'd normally set some stuff like the verify paths and * mode here
78     * because as things stand this will connect to * any server whose
79     * certificate is signed by any CA.
80     */
81
82    sbio = BIO_new_ssl_connect(ctx);
83
84    BIO_get_ssl(sbio, &ssl);
85
86    if (!ssl) {
87        fprintf(stderr, "Can't locate SSL pointer\n");
88        goto end;
89    }
90
91    /* Don't want any retries */
92    SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
93
94    /* We might want to do other things with ssl here */
95
96    BIO_set_conn_hostname(sbio, connect_str);
97
98    out = BIO_new_fp(stdout, BIO_NOCLOSE);
99    if (BIO_do_connect(sbio) <= 0) {
100        fprintf(stderr, "Error connecting to server\n");
101        ERR_print_errors_fp(stderr);
102        goto end;
103    }
104
105    /* Could examine ssl here to get connection info */
106
107    BIO_puts(sbio, "GET / HTTP/1.0\n\n");
108    for (;;) {
109        len = BIO_read(sbio, tmpbuf, 1024);
110        if (len <= 0)
111            break;
112        BIO_write(out, tmpbuf, len);
113    }
114 end:
115    SSL_CONF_CTX_free(cctx);
116    BIO_free_all(sbio);
117    BIO_free(out);
118    NCONF_free(conf);
119    return 0;
120}
121