2 * storage.h: interface defining functions for storage and recovery
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3 * of PuTTY's persistent data.
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6 #ifndef PUTTY_STORAGE_H
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7 #define PUTTY_STORAGE_H
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9 /* ----------------------------------------------------------------------
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10 * Functions to save and restore PuTTY sessions. Note that this is
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11 * only the low-level code to do the reading and writing. The
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12 * higher-level code that translates an internal Conf structure into
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13 * a set of (key,value) pairs in their external storage format is
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14 * elsewhere, since it doesn't (mostly) change between platforms.
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18 * Write a saved session. The caller is expected to call
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19 * open_setting_w() to get a `void *' handle, then pass that to a
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20 * number of calls to write_setting_s() and write_setting_i(), and
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21 * then close it using close_settings_w(). At the end of this call
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22 * sequence the settings should have been written to the PuTTY
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23 * persistent storage area.
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25 * A given key will be written at most once while saving a session.
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26 * Keys may be up to 255 characters long. String values have no length
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29 * Any returned error message must be freed after use.
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31 void *open_settings_w(const char *sessionname, char **errmsg);
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32 void write_setting_s(void *handle, const char *key, const char *value);
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33 void write_setting_i(void *handle, const char *key, int value);
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34 void write_setting_filename(void *handle, const char *key, Filename *value);
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35 void write_setting_fontspec(void *handle, const char *key, FontSpec *font);
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36 void close_settings_w(void *handle);
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39 * Read a saved session. The caller is expected to call
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40 * open_setting_r() to get a `void *' handle, then pass that to a
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41 * number of calls to read_setting_s() and read_setting_i(), and
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42 * then close it using close_settings_r().
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44 * read_setting_s() returns a dynamically allocated string which the
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45 * caller must free. read_setting_filename() and
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46 * read_setting_fontspec() likewise return dynamically allocated
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49 * If a particular string setting is not present in the session,
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50 * read_setting_s() can return NULL, in which case the caller
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51 * should invent a sensible default. If an integer setting is not
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52 * present, read_setting_i() returns its provided default.
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54 void *open_settings_r(const char *sessionname);
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55 char *read_setting_s(void *handle, const char *key);
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56 int read_setting_i(void *handle, const char *key, int defvalue);
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57 Filename *read_setting_filename(void *handle, const char *key);
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58 FontSpec *read_setting_fontspec(void *handle, const char *key);
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59 void close_settings_r(void *handle);
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62 * Delete a whole saved session.
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64 void del_settings(const char *sessionname);
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67 * Enumerate all saved sessions.
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69 void *enum_settings_start(void);
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70 char *enum_settings_next(void *handle, char *buffer, int buflen);
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71 void enum_settings_finish(void *handle);
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73 /* ----------------------------------------------------------------------
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74 * Functions to access PuTTY's host key database.
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78 * See if a host key matches the database entry. Return values can
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79 * be 0 (entry matches database), 1 (entry is absent in database),
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80 * or 2 (entry exists in database and is different).
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82 int verify_host_key(const char *hostname, int port,
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83 const char *keytype, const char *key);
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86 * Write a host key into the database, overwriting any previous
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87 * entry that might have been there.
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89 void store_host_key(const char *hostname, int port,
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90 const char *keytype, const char *key);
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92 /* ----------------------------------------------------------------------
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93 * Functions to access PuTTY's random number seed file.
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96 typedef void (*noise_consumer_t) (void *data, int len);
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99 * Read PuTTY's random seed file and pass its contents to a noise
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100 * consumer function.
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102 void read_random_seed(noise_consumer_t consumer);
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105 * Write PuTTY's random seed file from a given chunk of noise.
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107 void write_random_seed(void *data, int len);
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109 /* ----------------------------------------------------------------------
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110 * Cleanup function: remove all of PuTTY's persistent state.
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112 void cleanup_all(void);
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