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 an internal Conf structure into
  13  * a set of (key,value) pairs in their external storage format is
  14  * elsewhere, since it doesn't (mostly) 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  * A given key will be written at most once while saving a session.
  26  * Keys may be up to 255 characters long.  String values have no length
  27  * limit.
  28  *
  29  * Any returned error message must be freed after use.
  30  */
  31 void *open_settings_w(const char *sessionname, char **errmsg);
  32 void write_setting_s(void *handle, const char *key, const char *value);
  33 void write_setting_i(void *handle, const char *key, int value);
  34 void write_setting_filename(void *handle, const char *key, Filename *value);
  35 void write_setting_fontspec(void *handle, const char *key, FontSpec *font);
  36 void close_settings_w(void *handle);
  37
  38 /*
  39  * Read a saved session. The caller is expected to call
  40  * open_setting_r() to get a `void *' handle, then pass that to a
  41  * number of calls to read_setting_s() and read_setting_i(), and
  42  * then close it using close_settings_r().
  43  *
  44  * read_setting_s() returns a dynamically allocated string which the
  45  * caller must free. read_setting_filename() and
  46  * read_setting_fontspec() likewise return dynamically allocated
  47  * structures.
  48  *
  49  * If a particular string setting is not present in the session,
  50  * read_setting_s() can return NULL, in which case the caller
  51  * should invent a sensible default. If an integer setting is not
  52  * present, read_setting_i() returns its provided default.
  53  */
  54 void *open_settings_r(const char *sessionname);
  55 char *read_setting_s(void *handle, const char *key);
  56 int read_setting_i(void *handle, const char *key, int defvalue);
  57 Filename *read_setting_filename(void *handle, const char *key);
  58 FontSpec *read_setting_fontspec(void *handle, const char *key);
  59 void close_settings_r(void *handle);
  60
  61 /*
  62  * Delete a whole saved session.
  63  */
  64 void del_settings(const char *sessionname);
  65
  66 /*
  67  * Enumerate all saved sessions.
  68  */
  69 void *enum_settings_start(void);
  70 char *enum_settings_next(void *handle, char *buffer, int buflen);
  71 void enum_settings_finish(void *handle);
  72
  73 /* ----------------------------------------------------------------------
  74  * Functions to access PuTTY's host key database.
  75  */
  76
  77 /*
  78  * See if a host key matches the database entry. Return values can
  79  * be 0 (entry matches database), 1 (entry is absent in database),
  80  * or 2 (entry exists in database and is different).
  81  */
  82 int verify_host_key(const char *hostname, int port,
  83                     const char *keytype, const char *key);
  84
  85 /*
  86  * Write a host key into the database, overwriting any previous
  87  * entry that might have been there.
  88  */
  89 void store_host_key(const char *hostname, int port,
  90                     const char *keytype, const char *key);
  91
  92 /* ----------------------------------------------------------------------
  93  * Functions to access PuTTY's random number seed file.
  94  */
  95
  96 typedef void (*noise_consumer_t) (void *data, int len);
  97
  98 /*
  99  * Read PuTTY's random seed file and pass its contents to a noise
 100  * consumer function.
 101  */
 102 void read_random_seed(noise_consumer_t consumer);
 103
 104 /*
 105  * Write PuTTY's random seed file from a given chunk of noise.
 106  */
 107 void write_random_seed(void *data, int len);
 108
 109 /* ----------------------------------------------------------------------
 110  * Cleanup function: remove all of PuTTY's persistent state.
 111  */
 112 void cleanup_all(void);
 113
 114 #endif