2 This file is part of GNUnet.
3 (C) 2006, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file include/gnunet_common.h
23 * @brief commonly used definitions; globals in this file
24 * are exempt from the rule that the module name ("common")
25 * must be part of the symbol name.
27 * @author Christian Grothoff
30 #ifndef GNUNET_COMMON_H
31 #define GNUNET_COMMON_H
34 #include <sys/socket.h>
37 #include <netinet/in.h>
50 * Version of the API (for entire gnunetutil.so library).
52 #define GNUNET_UTIL_VERSION 0x00089900
55 * Name used for "services" that are actually command-line
56 * programs invoked by the end user.
58 #define GNUNET_CLIENT_SERVICE_NAME "client"
61 * Named constants for return values. The following
62 * invariants hold: "GNUNET_NO == 0" (to allow "if (GNUNET_NO)")
63 * "GNUNET_OK != GNUNET_SYSERR", "GNUNET_OK != GNUNET_NO", "GNUNET_NO != GNUNET_SYSERR"
64 * and finally "GNUNET_YES != GNUNET_NO".
67 #define GNUNET_SYSERR -1
71 #define GNUNET_MIN(a,b) (((a) < (b)) ? (a) : (b))
73 #define GNUNET_MAX(a,b) (((a) > (b)) ? (a) : (b))
76 * gcc-ism to get packed structs.
78 #define GNUNET_PACKED __attribute__((packed))
81 /* ************************ super-general types *********************** */
84 * Header for all communications.
86 struct GNUNET_MessageHeader
90 * The length of the struct (in bytes, including the length field itself),
91 * in big-endian format.
93 uint16_t size GNUNET_PACKED;
96 * The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
98 uint16_t type GNUNET_PACKED;
104 * @brief 512-bit hashcode
108 uint32_t bits[512 / 8 / sizeof (uint32_t)]; /* = 16 */
114 * The identity of the host (basically the SHA-512 hashcode of
117 struct GNUNET_PeerIdentity
119 GNUNET_HashCode hashPubKey GNUNET_PACKED;
124 * Function called with a filename.
127 * @param filename complete filename (absolute path)
128 * @return GNUNET_OK to continue to iterate,
129 * GNUNET_SYSERR to abort iteration with error!
131 typedef int (*GNUNET_FileNameCallback) (void *cls, const char *filename);
134 /* ****************************** logging ***************************** */
139 enum GNUNET_ErrorType
141 GNUNET_ERROR_TYPE_NONE = 0,
142 GNUNET_ERROR_TYPE_ERROR = 1,
143 GNUNET_ERROR_TYPE_WARNING = 2,
144 GNUNET_ERROR_TYPE_INFO = 4,
145 GNUNET_ERROR_TYPE_DEBUG = 8,
146 GNUNET_ERROR_TYPE_INVALID = 16,
147 GNUNET_ERROR_TYPE_BULK = 32
152 * User-defined handler for log messages.
155 * @param kind severeity
156 * @param component what component is issuing the message?
157 * @param date when was the message logged?
158 * @param message what is the message
160 typedef void (*GNUNET_Logger) (void *cls,
161 enum GNUNET_ErrorType kind,
162 const char *component,
163 const char *date, const char *message);
168 * @param kind how serious is the error?
169 * @param message what is the message (format string)
170 * @param ... arguments for format string
172 void GNUNET_log (enum GNUNET_ErrorType kind, const char *message, ...);
177 * Log function that specifies an alternative component.
178 * This function should be used by plugins.
180 * @param kind how serious is the error?
181 * @param comp component responsible for generating the message
182 * @param message what is the message (format string)
183 * @param ... arguments for format string
186 GNUNET_log_from (enum GNUNET_ErrorType kind,
187 const char *comp, const char *message, ...);
191 * Ignore the next n calls to the log function.
193 * @param n number of log calls to ignore
194 * @param check_reset GNUNET_YES to assert that the log skip counter is currently zero
196 void GNUNET_log_skip (unsigned int n, int check_reset);
202 * @param comp default component to use
203 * @param loglevel what types of messages should be logged
204 * @param logfile change logging to logfile (use NULL to keep stderr)
205 * @return GNUNET_OK on success, GNUNET_SYSERR if logfile could not be opened
208 GNUNET_log_setup (const char *comp, const char *loglevel, const char *logfile);
212 * Add a custom logger.
214 * @param logger log function
215 * @param logger_cls closure for logger
217 void GNUNET_logger_add (GNUNET_Logger logger, void *logger_cls);
221 * Remove a custom logger.
223 * @param logger log function
224 * @param logger_cls closure for logger
226 void GNUNET_logger_remove (GNUNET_Logger logger, void *logger_cls);
230 * Convert a hash value to a string (for printing debug messages).
231 * This is one of the very few calls in the entire API that is
234 * @param hc the hash code
237 const char *GNUNET_h2s (const GNUNET_HashCode * hc);
241 * Convert a hash value to a string (for printing debug messages).
242 * This prints all 104 characters of a hashcode!
243 * This is one of the very few calls in the entire API that is
246 * @param hc the hash code
249 const char *GNUNET_h2s_full (const GNUNET_HashCode * hc);
253 * Convert a peer identity to a string (for printing debug messages).
254 * This is one of the very few calls in the entire API that is
257 * @param pid the peer identity
258 * @return string form of the pid; will be overwritten by next
259 * call to GNUNET_i2s.
261 const char *GNUNET_i2s (const struct GNUNET_PeerIdentity *pid);
265 * Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string
266 * (for printing debug messages). This is one of the very few calls
267 * in the entire API that is NOT reentrant!
269 * @param addr the address
270 * @param addrlen the length of the address
271 * @return nicely formatted string for the address
272 * will be overwritten by next call to GNUNET_a2s.
274 const char *GNUNET_a2s (const struct sockaddr *addr, socklen_t addrlen);
277 * Convert error type to string.
279 * @param kind type to convert
280 * @return string corresponding to the type
282 const char *GNUNET_error_type_to_string (enum GNUNET_ErrorType kind);
286 * Use this for fatal errors that cannot be handled
288 #define GNUNET_assert(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); abort(); } } while(0)
291 * Use this for fatal errors that cannot be handled
293 #define GNUNET_assert_at(cond, f, l) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), f, l); abort(); } } while(0)
296 * Use this for internal assertion violations that are
297 * not fatal (can be handled) but should not occur.
299 #define GNUNET_break(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); } } while(0)
302 * Use this for assertion violations caused by other
303 * peers (i.e. protocol violations). We do not want to
304 * confuse end-users (say, some other peer runs an
305 * older, broken or incompatible GNUnet version), but
306 * we still want to see these problems during
307 * development and testing. "OP == other peer".
309 #define GNUNET_break_op(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, _("External protocol violation detected at %s:%d.\n"), __FILE__, __LINE__); } } while(0)
312 * Log an error message at log-level 'level' that indicates
313 * a failure of the command 'cmd' with the message given
314 * by strerror(errno).
316 #define GNUNET_log_strerror(level, cmd) do { GNUNET_log(level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, STRERROR(errno)); } while(0)
319 * Log an error message at log-level 'level' that indicates
320 * a failure of the command 'cmd' with the message given
321 * by strerror(errno).
323 #define GNUNET_log_strerror_file(level, cmd, filename) do { GNUNET_log(level, _("`%s' failed on file `%s' at %s:%d with error: %s\n"), cmd, filename,__FILE__, __LINE__, STRERROR(errno)); } while(0)
325 /* ************************* endianess conversion ****************** */
328 * Convert a long-long to host-byte-order.
329 * @param n the value in network byte order
330 * @return the same value in host byte order
332 unsigned long long GNUNET_ntohll (unsigned long long n);
335 * Convert a long long to network-byte-order.
336 * @param n the value in host byte order
337 * @return the same value in network byte order
339 unsigned long long GNUNET_htonll (unsigned long long n);
342 /* ************************* allocation functions ****************** */
345 * Maximum allocation with GNUNET_malloc macro.
347 #define GNUNET_MAX_MALLOC_CHECKED (1024 * 1024 * 40)
350 * Wrapper around malloc. Allocates size bytes of memory.
351 * The memory will be zero'ed out.
353 * @param size the number of bytes to allocate, must be
354 * smaller than 40 MB.
355 * @return pointer to size bytes of memory, never NULL (!)
357 #define GNUNET_malloc(size) GNUNET_xmalloc_(size, __FILE__, __LINE__)
360 * Allocate and initialize a block of memory.
362 * @param buf data to initalize the block with
363 * @param size the number of bytes in buf (and size of the allocation)
364 * @return pointer to size bytes of memory, never NULL (!)
366 #define GNUNET_memdup(buf,size) GNUNET_xmemdup_(buf, size, __FILE__, __LINE__)
369 * Wrapper around malloc. Allocates size bytes of memory.
370 * The memory will be zero'ed out.
372 * @param size the number of bytes to allocate
373 * @return pointer to size bytes of memory, NULL if we do not have enough memory
375 #define GNUNET_malloc_large(size) GNUNET_xmalloc_unchecked_(size, __FILE__, __LINE__)
378 * Wrapper around realloc. Rellocates size bytes of memory.
380 * @param ptr the pointer to reallocate
381 * @param size the number of bytes to reallocate
382 * @return pointer to size bytes of memory
384 #define GNUNET_realloc(ptr, size) GNUNET_xrealloc_(ptr, size, __FILE__, __LINE__)
387 * Wrapper around free. Frees the memory referred to by ptr.
388 * Note that is is generally better to free memory that was
389 * allocated with GNUNET_array_grow using GNUNET_array_grow(mem, size, 0) instead of GNUNET_free.
391 * @param ptr location where to free the memory. ptr must have
392 * been returned by GNUNET_strdup, GNUNET_strndup, GNUNET_malloc or GNUNET_array_grow earlier.
394 #define GNUNET_free(ptr) GNUNET_xfree_(ptr, __FILE__, __LINE__)
397 * Free the memory pointed to by ptr if ptr is not NULL.
398 * Equivalent to if (ptr!=null)GNUNET_free(ptr).
400 * @param ptr the location in memory to free
402 #define GNUNET_free_non_null(ptr) do { void * __x__ = ptr; if (__x__ != NULL) { GNUNET_free(__x__); } } while(0)
405 * Wrapper around GNUNET_strdup. Makes a copy of the zero-terminated string
408 * @param a pointer to a zero-terminated string
409 * @return a copy of the string including zero-termination
411 #define GNUNET_strdup(a) GNUNET_xstrdup_(a,__FILE__,__LINE__)
414 * Wrapper around GNUNET_strndup. Makes a partial copy of the string
417 * @param a pointer to a string
418 * @param length of the string to duplicate
419 * @return a partial copy of the string including zero-termination
421 #define GNUNET_strndup(a,b) GNUNET_xstrndup_(a,b,__FILE__,__LINE__)
424 * Grow a well-typed (!) array. This is a convenience
425 * method to grow a vector <tt>arr</tt> of size <tt>size</tt>
426 * to the new (target) size <tt>tsize</tt>.
429 * Example (simple, well-typed stack):
432 * static struct foo * myVector = NULL;
433 * static int myVecLen = 0;
435 * static void push(struct foo * elem) {
436 * GNUNET_array_grow(myVector, myVecLen, myVecLen+1);
437 * memcpy(&myVector[myVecLen-1], elem, sizeof(struct foo));
440 * static void pop(struct foo * elem) {
441 * if (myVecLen == 0) die();
442 * memcpy(elem, myVector[myVecLen-1], sizeof(struct foo));
443 * GNUNET_array_grow(myVector, myVecLen, myVecLen-1);
447 * @param arr base-pointer of the vector, may be NULL if size is 0;
448 * will be updated to reflect the new address. The TYPE of
449 * arr is important since size is the number of elements and
450 * not the size in bytes
451 * @param size the number of elements in the existing vector (number
452 * of elements to copy over)
453 * @param tsize the target size for the resulting vector, use 0 to
454 * free the vector (then, arr will be NULL afterwards).
456 #define GNUNET_array_grow(arr,size,tsize) GNUNET_xgrow_((void**)&arr, sizeof(arr[0]), &size, tsize, __FILE__, __LINE__)
459 * Append an element to a list (growing the
462 #define GNUNET_array_append(arr,size,element) do { GNUNET_array_grow(arr,size,size+1); arr[size-1] = element; } while(0)
465 * Like snprintf, just aborts if the buffer is of insufficient size.
467 * @param buf pointer to buffer that is written to
468 * @param size number of bytes in buf
469 * @param format format strings
470 * @param ... data for format string
471 * @return number of bytes written to buf or negative value on error
473 int GNUNET_snprintf (char *buf, size_t size, const char *format, ...);
477 * Like asprintf, just portable.
479 * @param buf set to a buffer of sufficient size (allocated, caller must free)
480 * @param format format string (see printf, fprintf, etc.)
481 * @param ... data for format string
482 * @return number of bytes in "*buf" excluding 0-termination
484 int GNUNET_asprintf (char **buf, const char *format, ...);
487 /* ************** internal implementations, use macros above! ************** */
490 * Allocate memory. Checks the return value, aborts if no more
491 * memory is available. Don't use GNUNET_xmalloc_ directly. Use the
492 * GNUNET_malloc macro.
493 * The memory will be zero'ed out.
495 * @param size number of bytes to allocate
496 * @param filename where is this call being made (for debugging)
497 * @param linenumber line where this call is being made (for debugging)
498 * @return allocated memory, never NULL
500 void *GNUNET_xmalloc_ (size_t size, const char *filename, int linenumber);
505 * Allocate and initialize memory. Checks the return value, aborts if no more
506 * memory is available. Don't use GNUNET_xmemdup_ directly. Use the
507 * GNUNET_memdup macro.
509 * @param buf buffer to initialize from (must contain size bytes)
510 * @param size number of bytes to allocate
511 * @param filename where is this call being made (for debugging)
512 * @param linenumber line where this call is being made (for debugging)
513 * @return allocated memory, never NULL
515 void *GNUNET_xmemdup_ (const void *buf, size_t size, const char *filename,
520 * Allocate memory. This function does not check if the allocation
521 * request is within reasonable bounds, allowing allocations larger
522 * than 40 MB. If you don't expect the possibility of very large
523 * allocations, use GNUNET_malloc instead. The memory will be zero'ed
526 * @param size number of bytes to allocate
527 * @param filename where is this call being made (for debugging)
528 * @param linenumber line where this call is being made (for debugging)
529 * @return pointer to size bytes of memory, NULL if we do not have enough memory
531 void *GNUNET_xmalloc_unchecked_ (size_t size,
532 const char *filename, int linenumber);
535 * Reallocate memory. Checks the return value, aborts if no more
536 * memory is available.
538 void *GNUNET_xrealloc_ (void *ptr,
539 size_t n, const char *filename, int linenumber);
542 * Free memory. Merely a wrapper for the case that we
543 * want to keep track of allocations. Don't use GNUNET_xfree_
544 * directly. Use the GNUNET_free macro.
546 * @param ptr pointer to memory to free
547 * @param filename where is this call being made (for debugging)
548 * @param linenumber line where this call is being made (for debugging)
550 void GNUNET_xfree_ (void *ptr, const char *filename, int linenumber);
554 * Dup a string. Don't call GNUNET_xstrdup_ directly. Use the GNUNET_strdup macro.
555 * @param str string to duplicate
556 * @param filename where is this call being made (for debugging)
557 * @param linenumber line where this call is being made (for debugging)
558 * @return the duplicated string
560 char *GNUNET_xstrdup_ (const char *str, const char *filename, int linenumber);
563 * Dup partially a string. Don't call GNUNET_xstrndup_ directly. Use the GNUNET_strndup macro.
564 * @param str string to duplicate
565 * @param len lenght of the string to duplicate
566 * @param filename where is this call being made (for debugging)
567 * @param linenumber line where this call is being made (for debugging)
568 * @return the duplicated string
570 char *GNUNET_xstrndup_ (const char *str, size_t len, const char *filename,
574 * Grow an array, the new elements are zeroed out.
575 * Grows old by (*oldCount-newCount)*elementSize
576 * bytes and sets *oldCount to newCount.
578 * Don't call GNUNET_xgrow_ directly. Use the GNUNET_array_grow macro.
580 * @param old address of the pointer to the array
582 * @param elementSize the size of the elements of the array
583 * @param oldCount address of the number of elements in the *old array
584 * @param newCount number of elements in the new array, may be 0 (then *old will be NULL afterwards)
585 * @param filename where is this call being made (for debugging)
586 * @param linenumber line where this call is being made (for debugging)
588 void GNUNET_xgrow_ (void **old,
590 unsigned int *oldCount,
591 unsigned int newCount,
592 const char *filename, int linenumber);
597 #if __STDC_VERSION__ < 199901L
599 #define __func__ __FUNCTION__
601 #define __func__ "<unknown>"
605 #endif /*GNUNET_COMMON_H_ */