crypto/external/bsd/openssl/dist/demos/tunala/tunala.h

   1 /*
   2  * Tunala ("Tunneler with a New Zealand accent") Written by Geoff Thorpe,
   3  * but endorsed/supported by noone. Please use this is if it's useful or
   4  * informative to you, but it's only here as a scratchpad for ideas about how
   5  * you might (or might not) program with OpenSSL. If you deploy this is in a
   6  * mission-critical environment, and have not read, understood, audited, and
   7  * modified this code to your satisfaction, and the result is that all hell
   8  * breaks loose and you are looking for a new employer, then it proves
   9  * nothing except perhaps that Darwinism is alive and well. Let's just say,
  10  * *I* don't use this in a mission-critical environment, so it would be
  11  * stupid for anyone to assume that it is solid and/or tested enough when
  12  * even its author doesn't place that much trust in it. You have been warned.
  13  * With thanks to Cryptographic Appliances, Inc.
  14  */
  15
  16 #ifndef _TUNALA_H
  17 # define _TUNALA_H
  18
  19 /* pull in autoconf fluff */
  20 # ifndef NO_CONFIG_H
  21 #  include "config.h"
  22 # else
  23 /*
  24  * We don't have autoconf, we have to set all of these unless a tweaked
  25  * Makefile tells us not to ...
  26  */
  27 /* headers */
  28 #  ifndef NO_HAVE_SELECT
  29 #   define HAVE_SELECT
  30 #  endif
  31 #  ifndef NO_HAVE_SOCKET
  32 #   define HAVE_SOCKET
  33 #  endif
  34 #  ifndef NO_HAVE_UNISTD_H
  35 #   define HAVE_UNISTD_H
  36 #  endif
  37 #  ifndef NO_HAVE_FCNTL_H
  38 #   define HAVE_FCNTL_H
  39 #  endif
  40 #  ifndef NO_HAVE_LIMITS_H
  41 #   define HAVE_LIMITS_H
  42 #  endif
  43 /* features */
  44 #  ifndef NO_HAVE_STRSTR
  45 #   define HAVE_STRSTR
  46 #  endif
  47 #  ifndef NO_HAVE_STRTOUL
  48 #   define HAVE_STRTOUL
  49 #  endif
  50 # endif
  51
  52 # if !defined(HAVE_SELECT) || !defined(HAVE_SOCKET)
  53 #  error "can't build without some network basics like select() and socket()"
  54 # endif
  55
  56 # include <stdlib.h>
  57 # ifndef NO_SYSTEM_H
  58 #  include <string.h>
  59 #  ifdef HAVE_UNISTD_H
  60 #   include <unistd.h>
  61 #  endif
  62 #  ifdef HAVE_FCNTL_H
  63 #   include <fcntl.h>
  64 #  endif
  65 #  ifdef HAVE_LIMITS_H
  66 #   include <limits.h>
  67 #  endif
  68 #  include <netdb.h>
  69 #  include <signal.h>
  70 #  include <sys/socket.h>
  71 #  include <sys/types.h>
  72 #  include <netinet/in.h>
  73 # endif                         /* !defined(NO_SYSTEM_H) */
  74
  75 # ifndef NO_OPENSSL
  76 #  include <openssl/err.h>
  77 #  include <openssl/engine.h>
  78 #  include <openssl/ssl.h>
  79 # endif                         /* !defined(NO_OPENSSL) */
  80
  81 # ifndef OPENSSL_NO_BUFFER
  82 /*
  83  * This is the generic "buffer" type that is used when feeding the
  84  * state-machine. It's basically a FIFO with respect to the "adddata" &
  85  * "takedata" type functions that operate on it.
  86  */
  87 #  define MAX_DATA_SIZE 16384
  88 typedef struct _buffer_t {
  89     unsigned char data[MAX_DATA_SIZE];
  90     unsigned int used;
  91     /*
  92      * Statistical values - counts the total number of bytes read in and read
  93      * out (respectively) since "buffer_init()"
  94      */
  95     unsigned long total_in, total_out;
  96 } buffer_t;
  97
  98 /* Initialise a buffer structure before use */
  99 void buffer_init(buffer_t * buf);
 100 /*
 101  * Cleanup a buffer structure - presently not needed, but if buffer_t is
 102  * converted to using dynamic allocation, this would be required - so should
 103  * be called to protect against an explosion of memory leaks later if the
 104  * change is made.
 105  */
 106 void buffer_close(buffer_t * buf);
 107
 108 /* Basic functions to manipulate buffers */
 109
 110 unsigned int buffer_used(buffer_t * buf); /* How much data in the buffer */
 111 unsigned int buffer_unused(buffer_t * buf); /* How much space in the buffer */
 112 int buffer_full(buffer_t * buf); /* Boolean, is it full? */
 113 int buffer_notfull(buffer_t * buf); /* Boolean, is it not full? */
 114 int buffer_empty(buffer_t * buf); /* Boolean, is it empty? */
 115 int buffer_notempty(buffer_t * buf); /* Boolean, is it not empty? */
 116 unsigned long buffer_total_in(buffer_t * buf); /* Total bytes written to
 117                                                 * buffer */
 118 unsigned long buffer_total_out(buffer_t * buf); /* Total bytes read from
 119                                                  * buffer */
 120
 121 #  if 0                         /* Currently used only within buffer.c -
 122                                  * better to expose only higher-level
 123                                  * functions anyway */
 124 /*
 125  * Add data to the tail of the buffer, returns the amount that was actually
 126  * added (so, you need to check if return value is less than size)
 127  */
 128 unsigned int buffer_adddata(buffer_t * buf, const unsigned char *ptr,
 129                             unsigned int size);
 130
 131 /*
 132  * Take data from the front of the buffer (and scroll the rest forward). If
 133  * "ptr" is NULL, this just removes data off the front of the buffer. Return
 134  * value is the amount actually removed (can be less than size if the buffer
 135  * has too little data).
 136  */
 137 unsigned int buffer_takedata(buffer_t * buf, unsigned char *ptr,
 138                              unsigned int size);
 139
 140 /*
 141  * Flushes as much data as possible out of the "from" buffer into the "to"
 142  * buffer. Return value is the amount moved. The amount moved can be
 143  * restricted to a maximum by specifying "cap" - setting it to -1 means no
 144  * limit.
 145  */
 146 unsigned int buffer_tobuffer(buffer_t * to, buffer_t * from, int cap);
 147 #  endif
 148
 149 #  ifndef NO_IP
 150 /* Read or write between a file-descriptor and a buffer */
 151 int buffer_from_fd(buffer_t * buf, int fd);
 152 int buffer_to_fd(buffer_t * buf, int fd);
 153 #  endif                        /* !defined(NO_IP) */
 154
 155 #  ifndef NO_OPENSSL
 156 /* Read or write between an SSL or BIO and a buffer */
 157 void buffer_from_SSL(buffer_t * buf, SSL *ssl);
 158 void buffer_to_SSL(buffer_t * buf, SSL *ssl);
 159 void buffer_from_BIO(buffer_t * buf, BIO *bio);
 160 void buffer_to_BIO(buffer_t * buf, BIO *bio);
 161
 162 /* Callbacks */
 163 void cb_ssl_info(const SSL *s, int where, int ret);
 164 /* Called if output should be sent too */
 165 void cb_ssl_info_set_output(FILE *fp);
 166 int cb_ssl_verify(int ok, X509_STORE_CTX *ctx);
 167 void cb_ssl_verify_set_output(FILE *fp);
 168 void cb_ssl_verify_set_depth(unsigned int verify_depth);
 169 void cb_ssl_verify_set_level(unsigned int level);
 170 RSA *cb_generate_tmp_rsa(SSL *s, int is_export, int keylength);
 171 #  endif                        /* !defined(NO_OPENSSL) */
 172 # endif                         /* !defined(OPENSSL_NO_BUFFER) */
 173
 174 # ifndef NO_TUNALA
 175 #  ifdef OPENSSL_NO_BUFFER
 176 #   error "TUNALA section of tunala.h requires BUFFER support"
 177 #  endif
 178 typedef struct _state_machine_t {
 179     SSL *ssl;
 180     BIO *bio_intossl;
 181     BIO *bio_fromssl;
 182     buffer_t clean_in, clean_out;
 183     buffer_t dirty_in, dirty_out;
 184 } state_machine_t;
 185 typedef enum {
 186     SM_CLEAN_IN, SM_CLEAN_OUT,
 187     SM_DIRTY_IN, SM_DIRTY_OUT
 188 } sm_buffer_t;
 189 void state_machine_init(state_machine_t * machine);
 190 void state_machine_close(state_machine_t * machine);
 191 buffer_t *state_machine_get_buffer(state_machine_t * machine,
 192                                    sm_buffer_t type);
 193 SSL *state_machine_get_SSL(state_machine_t * machine);
 194 int state_machine_set_SSL(state_machine_t * machine, SSL *ssl, int is_server);
 195 /* Performs the data-IO loop and returns zero if the machine should close */
 196 int state_machine_churn(state_machine_t * machine);
 197 /*
 198  * Is used to handle closing conditions - namely when one side of the tunnel
 199  * has closed but the other should finish flushing.
 200  */
 201 int state_machine_close_clean(state_machine_t * machine);
 202 int state_machine_close_dirty(state_machine_t * machine);
 203 # endif                         /* !defined(NO_TUNALA) */
 204
 205 # ifndef NO_IP
 206 /*
 207  * Initialise anything related to the networking. This includes blocking
 208  * pesky SIGPIPE signals.
 209  */
 210 int ip_initialise(void);
 211 /*
 212  * ip is the 4-byte ip address (eg. 127.0.0.1 is {0x7F,0x00,0x00,0x01}), port
 213  * is the port to listen on (host byte order), and the return value is the
 214  * file-descriptor or -1 on error.
 215  */
 216 int ip_create_listener_split(const char *ip, unsigned short port);
 217 /* Same semantics as above. */
 218 int ip_create_connection_split(const char *ip, unsigned short port);
 219 /* Converts a string into the ip/port before calling the above */
 220 int ip_create_listener(const char *address);
 221 int ip_create_connection(const char *address);
 222 /*
 223  * Just does a string conversion on its own. NB: If accept_all_ip is
 224  * non-zero, then the address string could be just a port. Ie. it's suitable
 225  * for a listening address but not a connecting address.
 226  */
 227 int ip_parse_address(const char *address, const char **parsed_ip,
 228                      unsigned short *port, int accept_all_ip);
 229 /*
 230  * Accepts an incoming connection through the listener. Assumes selects and
 231  * what-not have deemed it an appropriate thing to do.
 232  */
 233 int ip_accept_connection(int listen_fd);
 234 # endif                         /* !defined(NO_IP) */
 235
 236 /* These functions wrap up things that can be portability hassles. */
 237 int int_strtoul(const char *str, unsigned long *val);
 238 # ifdef HAVE_STRSTR
 239 #  define int_strstr strstr
 240 # else
 241 char *int_strstr(const char *haystack, const char *needle);
 242 # endif
 243
 244 #endif                          /* !defined(_TUNALA_H) */