git.distorted.org.uk Git - u/mdw/putty/blob - storage.h

   1 /*
   2  * storage.h: interface defining functions for storage and recovery
   3  * of PuTTY's persistent data.
   4  */
   5
   6 #ifndef PUTTY_STORAGE_H
   7 #define PUTTY_STORAGE_H
   8
   9 /* ----------------------------------------------------------------------
  10  * Functions to save and restore PuTTY sessions. Note that this is
  11  * only the low-level code to do the reading and writing. The
  12  * higher-level code that translates a Config structure into a set
  13  * of (key,value) pairs is elsewhere, since it doesn't (mostly)
  14  * change between platforms.
  15  */
  16
  17 /*
  18  * Write a saved session. The caller is expected to call
  19  * open_setting_w() to get a `void *' handle, then pass that to a
  20  * number of calls to write_setting_s() and write_setting_i(), and
  21  * then close it using close_settings_w(). At the end of this call
  22  * sequence the settings should have been written to the PuTTY
  23  * persistent storage area.
  24  */
  25 void *open_settings_w(char *sessionname);
  26 void write_setting_s(void *handle, char *key, char *value);
  27 void write_setting_i(void *handle, char *key, int value);
  28 void close_settings_w(void *handle);
  29
  30 /*
  31  * Read a saved session. The caller is expected to call
  32  * open_setting_r() to get a `void *' handle, then pass that to a
  33  * number of calls to read_setting_s() and read_setting_i(), and
  34  * then close it using close_settings_r().
  35  *
  36  * read_setting_s() writes into the provided buffer and returns a
  37  * pointer to the same buffer.
  38  *
  39  * If a particular string setting is not present in the session,
  40  * read_setting_s() can return NULL, in which case the caller
  41  * should invent a sensible default. If an integer setting is not
  42  * present, read_setting_i() returns its provided default.
  43  */
  44 void *open_settings_r(char *sessionname);
  45 char *read_setting_s(void *handle, char *key, char *buffer, int buflen);
  46 int read_setting_i(void *handle, char *key, int defvalue);
  47 void close_settings_r(void *handle);
  48
  49 /*
  50  * Delete a whole saved session.
  51  */
  52 void del_settings(char *sessionname);
  53
  54 /*
  55  * Enumerate all saved sessions.
  56  */
  57 void *enum_settings_start(void);
  58 char *enum_settings_next(void *handle, char *buffer, int buflen);
  59 void enum_settings_finish(void *handle);
  60
  61 /* ----------------------------------------------------------------------
  62  * Functions to access PuTTY's host key database.
  63  */
  64
  65 /*
  66  * See if a host key matches the database entry. Return values can
  67  * be 0 (entry matches database), 1 (entry is absent in database),
  68  * or 2 (entry exists in database and is different).
  69  */
  70 int verify_host_key(char *hostname, char *keytype, char *key);
  71
  72 /*
  73  * Write a host key into the database, overwriting any previous
  74  * entry that might have been there.
  75  */
  76 void store_host_key(char *hostname, char *keytype, char *key);
  77
  78 /* ----------------------------------------------------------------------
  79  * Functions to access PuTTY's random number seed file.
  80  */
  81
  82 typedef void (*noise_consumer_t)(void *data, int len);
  83
  84 /*
  85  * Read PuTTY's random seed file and pass its contents to a noise
  86  * consumer function.
  87  */
  88 void read_random_seed(noise_consumer_t consumer);
  89
  90 /*
  91  * Write PuTTY's random seed file from a given chunk of noise.
  92  */
  93 void write_random_seed(void *data, int len);
  94
  95 /* ----------------------------------------------------------------------
  96  * Cleanup function: remove all of PuTTY's persistent state.
  97  */
  98 void cleanup_all(void);
  99
 100 #endif