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cli.cpp
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1 /* cli.cpp - Minimal ssleay client for Unix
2  30.9.1996, Sampo Kellomaki <[email protected]> */
3 
4 /* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b
5  Simplified to be even more minimal
6  12/98 - 4/99 Wade Scholine <[email protected]> */
7 
8 #include <stdio.h>
9 #include <memory.h>
10 #include <errno.h>
11 #include <sys/types.h>
12 #include <sys/socket.h>
13 #include <netinet/in.h>
14 #include <arpa/inet.h>
15 #include <netdb.h>
16 
17 #include <openssl/crypto.h>
18 #include <openssl/x509.h>
19 #include <openssl/pem.h>
20 #include <openssl/ssl.h>
21 #include <openssl/err.h>
22 
23 
24 #define CHK_NULL(x) if ((x)==NULL) exit (1)
25 #define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
26 #define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }
27 
28 void main ()
29 {
30  int err;
31  int sd;
32  struct sockaddr_in sa;
33  SSL_CTX* ctx;
34  SSL* ssl;
35  X509* server_cert;
36  char* str;
37  char buf [4096];
38  SSL_METHOD *meth;
39 
40  SSLeay_add_ssl_algorithms();
41  meth = SSLv2_client_method();
42  SSL_load_error_strings();
43  ctx = SSL_CTX_new (meth); CHK_NULL(ctx);
44 
45  CHK_SSL(err);
46 
47  /* ----------------------------------------------- */
48  /* Create a socket and connect to server using normal socket calls. */
49 
50  sd = socket (AF_INET, SOCK_STREAM, 0); CHK_ERR(sd, "socket");
51 
52  memset (&sa, '\0', sizeof(sa));
53  sa.sin_family = AF_INET;
54  sa.sin_addr.s_addr = inet_addr ("127.0.0.1"); /* Server IP */
55  sa.sin_port = htons (1111); /* Server Port number */
56 
57  err = connect(sd, (struct sockaddr*) &sa,
58  sizeof(sa)); CHK_ERR(err, "connect");
59 
60  /* ----------------------------------------------- */
61  /* Now we have TCP conncetion. Start SSL negotiation. */
62 
63  ssl = SSL_new (ctx); CHK_NULL(ssl);
64  SSL_set_fd (ssl, sd);
65  err = SSL_connect (ssl); CHK_SSL(err);
66 
67  /* Following two steps are optional and not required for
68  data exchange to be successful. */
69 
70  /* Get the cipher - opt */
71 
72  printf ("SSL connection using %s\n", SSL_get_cipher (ssl));
73 
74  /* Get server's certificate (note: beware of dynamic allocation) - opt */
75 
76  server_cert = SSL_get_peer_certificate (ssl); CHK_NULL(server_cert);
77  printf ("Server certificate:\n");
78 
79  str = X509_NAME_oneline (X509_get_subject_name (server_cert),0,0);
80  CHK_NULL(str);
81  printf ("\t subject: %s\n", str);
82  OPENSSL_free (str);
83 
84  str = X509_NAME_oneline (X509_get_issuer_name (server_cert),0,0);
85  CHK_NULL(str);
86  printf ("\t issuer: %s\n", str);
87  OPENSSL_free (str);
88 
89  /* We could do all sorts of certificate verification stuff here before
90  deallocating the certificate. */
91 
92  X509_free (server_cert);
93 
94  /* --------------------------------------------------- */
95  /* DATA EXCHANGE - Send a message and receive a reply. */
96 
97  err = SSL_write (ssl, "Hello World!", strlen("Hello World!")); CHK_SSL(err);
98 
99  err = SSL_read (ssl, buf, sizeof(buf) - 1); CHK_SSL(err);
100  buf[err] = '\0';
101  printf ("Got %d chars:'%s'\n", err, buf);
102  SSL_shutdown (ssl); /* send SSL/TLS close_notify */
103 
104  /* Clean up. */
105 
106  close (sd);
107  SSL_free (ssl);
108  SSL_CTX_free (ctx);
109 }
110 /* EOF - cli.cpp */
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