This file is indexed.

/usr/include/libssh/callbacks.h is in libssh-dev 0.5.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
/*
 * This file is part of the SSH Library
 *
 * Copyright (c) 2009 Aris Adamantiadis <aris@0xbadc0de.be>
 *
 * The SSH Library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * The SSH Library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the SSH Library; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/* callback.h
 * This file includes the public declarations for the libssh callback mechanism
 */

#ifndef _SSH_CALLBACK_H
#define _SSH_CALLBACK_H

#include <libssh/libssh.h>
#include <string.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup libssh_callbacks The libssh callbacks
 * @ingroup libssh
 *
 * Callback which can be replaced in libssh.
 *
 * @{
 */

/** @internal
 * @brief callback to process simple codes
 * @param code value to transmit
 * @param user Userdata to pass in callback
 */
typedef void (*ssh_callback_int) (int code, void *user);

/** @internal
 * @brief callback for data received messages.
 * @param data data retrieved from the socket or stream
 * @param len number of bytes available from this stream
 * @param user user-supplied pointer sent along with all callback messages
 * @returns number of bytes processed by the callee. The remaining bytes will
 * be sent in the next callback message, when more data is available.
 */
typedef int (*ssh_callback_data) (const void *data, size_t len, void *user);

typedef void (*ssh_callback_int_int) (int code, int errno_code, void *user);

typedef int (*ssh_message_callback) (ssh_session, ssh_message message, void *user);
typedef int (*ssh_channel_callback_int) (ssh_channel channel, int code, void *user);
typedef int (*ssh_channel_callback_data) (ssh_channel channel, int code, void *data, size_t len, void *user);
/**
 * @brief SSH authentication callback.
 *
 * @param prompt        Prompt to be displayed.
 * @param buf           Buffer to save the password. You should null-terminate it.
 * @param len           Length of the buffer.
 * @param echo          Enable or disable the echo of what you type.
 * @param verify        Should the password be verified?
 * @param userdata      Userdata to be passed to the callback function. Useful
 *                      for GUI applications.
 *
 * @return              0 on success, < 0 on error.
 */

typedef int (*ssh_auth_callback) (const char *prompt, char *buf, size_t len,
    int echo, int verify, void *userdata);
/**
 * @brief SSH log callback. All logging messages will go through this callback
 * @param session Current session handler
 * @param priority Priority of the log, the smaller being the more important
 * @param message the actual message
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_log_callback) (ssh_session session, int priority,
    const char *message, void *userdata);

/**
 * @brief SSH Connection status callback.
 * @param session Current session handler
 * @param status Percentage of connection status, going from 0.0 to 1.0
 * once connection is done.
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_status_callback) (ssh_session session, float status,
		void *userdata);

/**
 * @brief SSH global request callback. All global request will go through this
 * callback.
 * @param session Current session handler
 * @param message the actual message
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_global_request_callback) (ssh_session session,
                                        ssh_message message, void *userdata);

/**
 * The structure to replace libssh functions with appropriate callbacks.
 */
struct ssh_callbacks_struct {
  /** DON'T SET THIS use ssh_callbacks_init() instead. */
  size_t size;
  /**
   * User-provided data. User is free to set anything he wants here
   */
  void *userdata;
  /**
   * This functions will be called if e.g. a keyphrase is needed.
   */
  ssh_auth_callback auth_function;
  /**
   * This function will be called each time a loggable event happens.
   */
  ssh_log_callback log_function;
  /**
   * This function gets called during connection time to indicate the
   * percentage of connection steps completed.
   */
  void (*connect_status_function)(void *userdata, float status);
  /**
   * This function will be called each time a global request is received.
   */
  ssh_global_request_callback global_request_function;
};
typedef struct ssh_callbacks_struct *ssh_callbacks;

/**
 * These are the callbacks exported by the socket structure
 * They are called by the socket module when a socket event appears
 */
struct ssh_socket_callbacks_struct {
  /**
   * User-provided data. User is free to set anything he wants here
   */
  void *userdata;
	/**
	 * This function will be called each time data appears on socket. The data
	 * not consumed will appear on the next data event.
	 */
  ssh_callback_data data;
  /** This function will be called each time a controlflow state changes, i.e.
   * the socket is available for reading or writing.
   */
  ssh_callback_int controlflow;
  /** This function will be called each time an exception appears on socket. An
   * exception can be a socket problem (timeout, ...) or an end-of-file.
   */
  ssh_callback_int_int exception;
  /** This function is called when the ssh_socket_connect was used on the socket
   * on nonblocking state, and the connection successed.
   */
  ssh_callback_int_int connected;
};
typedef struct ssh_socket_callbacks_struct *ssh_socket_callbacks;

#define SSH_SOCKET_FLOW_WRITEWILLBLOCK 1
#define SSH_SOCKET_FLOW_WRITEWONTBLOCK 2

#define SSH_SOCKET_EXCEPTION_EOF 	     1
#define SSH_SOCKET_EXCEPTION_ERROR     2

#define SSH_SOCKET_CONNECTED_OK 			1
#define SSH_SOCKET_CONNECTED_ERROR 		2
#define SSH_SOCKET_CONNECTED_TIMEOUT 	3

/**
 * @brief Initializes an ssh_callbacks_struct
 * A call to this macro is mandatory when you have set a new
 * ssh_callback_struct structure. Its goal is to maintain the binary
 * compatibility with future versions of libssh as the structure
 * evolves with time.
 */
#define ssh_callbacks_init(p) do {\
	(p)->size=sizeof(*(p)); \
} while(0);

/**
 * @internal
 * @brief tests if a callback can be called without crash
 *  verifies that the struct size if big enough
 *  verifies that the callback pointer exists
 * @param p callback pointer
 * @param c callback name
 * @returns nonzero if callback can be called
 */
#define ssh_callbacks_exists(p,c) (\
  (p != NULL) && ( (char *)&((p)-> c) < (char *)(p) + (p)->size ) && \
  ((p)-> c != NULL) \
  )

/** @brief Prototype for a packet callback, to be called when a new packet arrives
 * @param session The current session of the packet
 * @param type packet type (see ssh2.h)
 * @param packet buffer containing the packet, excluding size, type and padding fields
 * @param user user argument to the callback
 * and are called each time a packet shows up
 * @returns SSH_PACKET_USED Packet was parsed and used
 * @returns SSH_PACKET_NOT_USED Packet was not used or understood, processing must continue
 */
typedef int (*ssh_packet_callback) (ssh_session session, uint8_t type, ssh_buffer packet, void *user);

/** return values for a ssh_packet_callback */
/** Packet was used and should not be parsed by another callback */
#define SSH_PACKET_USED 1
/** Packet was not used and should be passed to any other callback
 * available */
#define SSH_PACKET_NOT_USED 2


/** @brief This macro declares a packet callback handler
 * @code
 * SSH_PACKET_CALLBACK(mycallback){
 * ...
 * }
 * @endcode
 */
#define SSH_PACKET_CALLBACK(name) \
	int name (ssh_session session, uint8_t type, ssh_buffer packet, void *user)

struct ssh_packet_callbacks_struct {
	/** Index of the first packet type being handled */
	uint8_t start;
	/** Number of packets being handled by this callback struct */
	uint8_t n_callbacks;
	/** A pointer to n_callbacks packet callbacks */
	ssh_packet_callback *callbacks;
  /**
   * User-provided data. User is free to set anything he wants here
   */
	void *user;
};

typedef struct ssh_packet_callbacks_struct *ssh_packet_callbacks;

/**
 * @brief Set the session callback functions.
 *
 * This functions sets the callback structure to use your own callback
 * functions for auth, logging and status.
 *
 * @code
 * struct ssh_callbacks_struct cb = {
 *   .userdata = data,
 *   .auth_function = my_auth_function
 * };
 * ssh_callbacks_init(&cb);
 * ssh_set_callbacks(session, &cb);
 * @endcode
 *
 * @param  session      The session to set the callback structure.
 *
 * @param  cb           The callback structure itself.
 *
 * @return SSH_OK on success, SSH_ERROR on error.
 */
LIBSSH_API int ssh_set_callbacks(ssh_session session, ssh_callbacks cb);

/**
 * @brief SSH channel data callback. Called when data is available on a channel
 * @param session Current session handler
 * @param channel the actual channel
 * @param data the data that has been read on the channel
 * @param len the length of the data
 * @param is_stderr is 0 for stdout or 1 for stderr
 * @param userdata Userdata to be passed to the callback function.
 */
typedef int (*ssh_channel_data_callback) (ssh_session session,
                                           ssh_channel channel,
                                           void *data,
                                           uint32_t len,
                                           int is_stderr,
                                           void *userdata);

/**
 * @brief SSH channel eof callback. Called when a channel receives EOF
 * @param session Current session handler
 * @param channel the actual channel
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_channel_eof_callback) (ssh_session session,
                                           ssh_channel channel,
                                           void *userdata);

/**
 * @brief SSH channel close callback. Called when a channel is closed by remote peer
 * @param session Current session handler
 * @param channel the actual channel
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_channel_close_callback) (ssh_session session,
                                            ssh_channel channel,
                                            void *userdata);

/**
 * @brief SSH channel signal callback. Called when a channel has received a signal
 * @param session Current session handler
 * @param channel the actual channel
 * @param signal the signal name (without the SIG prefix)
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_channel_signal_callback) (ssh_session session,
                                            ssh_channel channel,
                                            const char *signal,
                                            void *userdata);

/**
 * @brief SSH channel exit status callback. Called when a channel has received an exit status
 * @param session Current session handler
 * @param channel the actual channel
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_channel_exit_status_callback) (ssh_session session,
                                            ssh_channel channel,
                                            int exit_status,
                                            void *userdata);

/**
 * @brief SSH channel exit signal callback. Called when a channel has received an exit signal
 * @param session Current session handler
 * @param channel the actual channel
 * @param signal the signal name (without the SIG prefix)
 * @param core a boolean telling wether a core has been dumped or not
 * @param errmsg the description of the exception
 * @param lang the language of the description (format: RFC 3066)
 * @param userdata Userdata to be passed to the callback function.
 */
typedef void (*ssh_channel_exit_signal_callback) (ssh_session session,
                                            ssh_channel channel,
                                            const char *signal,
                                            int core,
                                            const char *errmsg,
                                            const char *lang,
                                            void *userdata);

struct ssh_channel_callbacks_struct {
  /** DON'T SET THIS use ssh_callbacks_init() instead. */
  size_t size;
  /**
   * User-provided data. User is free to set anything he wants here
   */
  void *userdata;
  /**
   * This functions will be called when there is data available.
   */
  ssh_channel_data_callback channel_data_function;
  /**
   * This functions will be called when the channel has received an EOF.
   */
  ssh_channel_eof_callback channel_eof_function;
  /**
   * This functions will be called when the channel has been closed by remote
   */
  ssh_channel_close_callback channel_close_function;
  /**
   * This functions will be called when a signal has been received
   */
  ssh_channel_signal_callback channel_signal_function;
  /**
   * This functions will be called when an exit status has been received
   */
  ssh_channel_exit_status_callback channel_exit_status_function;
  /**
   * This functions will be called when an exit signal has been received
   */
  ssh_channel_exit_signal_callback channel_exit_signal_function;
};
typedef struct ssh_channel_callbacks_struct *ssh_channel_callbacks;

/**
 * @brief Set the channel callback functions.
 *
 * This functions sets the callback structure to use your own callback
 * functions for channel data and exceptions
 *
 * @code
 * struct ssh_channel_callbacks_struct cb = {
 *   .userdata = data,
 *   .channel_data = my_channel_data_function
 * };
 * ssh_callbacks_init(&cb);
 * ssh_set_channel_callbacks(channel, &cb);
 * @endcode
 *
 * @param  channel      The channel to set the callback structure.
 *
 * @param  cb           The callback structure itself.
 *
 * @return SSH_OK on success, SSH_ERROR on error.
 */
LIBSSH_API int ssh_set_channel_callbacks(ssh_channel channel,
                                         ssh_channel_callbacks cb);

/** @} */

/** @group libssh_threads
 * @{
 */

typedef int (*ssh_thread_callback) (void **lock);

typedef unsigned long (*ssh_thread_id_callback) (void);
struct ssh_threads_callbacks_struct {
	const char *type;
  ssh_thread_callback mutex_init;
  ssh_thread_callback mutex_destroy;
  ssh_thread_callback mutex_lock;
  ssh_thread_callback mutex_unlock;
  ssh_thread_id_callback thread_id;
};

/**
 * @brief sets the thread callbacks necessary if your program is using
 * libssh in a multithreaded fashion. This function must be called first,
 * outside of any threading context (in your main() for instance), before
 * ssh_init().
 * @param cb pointer to a ssh_threads_callbacks_struct structure, which contains
 * the different callbacks to be set.
 * @see ssh_threads_callbacks_struct
 * @see SSH_THREADS_PTHREAD
 */
LIBSSH_API int ssh_threads_set_callbacks(struct ssh_threads_callbacks_struct
    *cb);

/**
 * @brief returns a pointer on the pthread threads callbacks, to be used with
 * ssh_threads_set_callbacks.
 * @warning you have to link with the library ssh_threads.
 * @see ssh_threads_set_callbacks
 */
LIBSSH_API struct ssh_threads_callbacks_struct *ssh_threads_get_pthread(void);

/**
 * @brief returns a pointer on the noop threads callbacks, to be used with
 * ssh_threads_set_callbacks. These callbacks do nothing and are being used by
 * default.
 * @see ssh_threads_set_callbacks
 */
LIBSSH_API struct ssh_threads_callbacks_struct *ssh_threads_get_noop(void);

/** @} */
#ifdef __cplusplus
}
#endif

#endif /*_SSH_CALLBACK_H */

/* @} */