xref: /openssl/demos/bio/client-arg.c (revision da1c088f)
1 /*
2  * Copyright 2013-2023 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (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 
main(int argc,char ** argv)14 int main(int argc, char **argv)
15 {
16     BIO *sbio = NULL, *out = NULL;
17     int len;
18     char tmpbuf[1024];
19     SSL_CTX *ctx;
20     SSL_CONF_CTX *cctx;
21     SSL *ssl;
22     char **args = argv + 1;
23     const char *connect_str = "localhost:4433";
24     int nargs = argc - 1;
25     int ret = EXIT_FAILURE;
26 
27     ctx = SSL_CTX_new(TLS_client_method());
28     cctx = SSL_CONF_CTX_new();
29     SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CLIENT);
30     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
31     while (*args && **args == '-') {
32         int rv;
33         /* Parse standard arguments */
34         rv = SSL_CONF_cmd_argv(cctx, &nargs, &args);
35         if (rv == -3) {
36             fprintf(stderr, "Missing argument for %s\n", *args);
37             goto end;
38         }
39         if (rv < 0) {
40             fprintf(stderr, "Error in command %s\n", *args);
41             ERR_print_errors_fp(stderr);
42             goto end;
43         }
44         /* If rv > 0 we processed something so proceed to next arg */
45         if (rv > 0)
46             continue;
47         /* Otherwise application specific argument processing */
48         if (strcmp(*args, "-connect") == 0) {
49             connect_str = args[1];
50             if (connect_str == NULL) {
51                 fprintf(stderr, "Missing -connect argument\n");
52                 goto end;
53             }
54             args += 2;
55             nargs -= 2;
56             continue;
57         } else {
58             fprintf(stderr, "Unknown argument %s\n", *args);
59             goto end;
60         }
61     }
62 
63     if (!SSL_CONF_CTX_finish(cctx)) {
64         fprintf(stderr, "Finish error\n");
65         ERR_print_errors_fp(stderr);
66         goto end;
67     }
68 
69     /*
70      * We'd normally set some stuff like the verify paths and * mode here
71      * because as things stand this will connect to * any server whose
72      * certificate is signed by any CA.
73      */
74 
75     sbio = BIO_new_ssl_connect(ctx);
76 
77     BIO_get_ssl(sbio, &ssl);
78 
79     if (!ssl) {
80         fprintf(stderr, "Can't locate SSL pointer\n");
81         goto end;
82     }
83 
84     /* We might want to do other things with ssl here */
85 
86     BIO_set_conn_hostname(sbio, connect_str);
87 
88     out = BIO_new_fp(stdout, BIO_NOCLOSE);
89     if (BIO_do_connect(sbio) <= 0) {
90         fprintf(stderr, "Error connecting to server\n");
91         ERR_print_errors_fp(stderr);
92         goto end;
93     }
94 
95     /* Could examine ssl here to get connection info */
96 
97     BIO_puts(sbio, "GET / HTTP/1.0\n\n");
98     for (;;) {
99         len = BIO_read(sbio, tmpbuf, 1024);
100         if (len <= 0)
101             break;
102         BIO_write(out, tmpbuf, len);
103     }
104     ret = EXIT_SUCCESS;
105  end:
106     SSL_CONF_CTX_free(cctx);
107     BIO_free_all(sbio);
108     BIO_free(out);
109     return ret;
110 }
111