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_UNSPECIFIED = -1,
142 GNUNET_ERROR_TYPE_NONE = 0,
143 GNUNET_ERROR_TYPE_ERROR = 1,
144 GNUNET_ERROR_TYPE_WARNING = 2,
145 GNUNET_ERROR_TYPE_INFO = 4,
146 GNUNET_ERROR_TYPE_DEBUG = 8,
147 GNUNET_ERROR_TYPE_INVALID = 16,
148 GNUNET_ERROR_TYPE_BULK = 32
153 * User-defined handler for log messages.
156 * @param kind severeity
157 * @param component what component is issuing the message?
158 * @param date when was the message logged?
159 * @param message what is the message
161 typedef void (*GNUNET_Logger) (void *cls, enum GNUNET_ErrorType kind,
162 const char *component, const char *date,
163 const char *message);
167 * Number of log calls to ignore.
169 extern unsigned int skip_log;
170 #if !defined(GNUNET_CULL_LOGGING)
172 GNUNET_get_log_call_status (int caller_level, const char *comp, const char *file, const char *function, int line);
177 * @param kind how serious is the error?
178 * @param message what is the message (format string)
179 * @param ... arguments for format string
182 GNUNET_log_nocheck (enum GNUNET_ErrorType kind, const char *message, ...);
185 #if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
186 #define _GNUNET_BOOLEAN_EXPR(expr) \
188 int _gnunet_boolean_var_; \
190 _gnunet_boolean_var_ = 1; \
192 _gnunet_boolean_var_ = 0; \
193 _gnunet_boolean_var_; \
195 #define GN_LIKELY(expr) (__builtin_expect (_GNUNET_BOOLEAN_EXPR(expr), 1))
196 #define GN_UNLIKELY(expr) (__builtin_expect (_GNUNET_BOOLEAN_EXPR(expr), 0))
198 #define GN_LIKELY(expr) (expr)
199 #define GN_UNLIKELY(expr) (expr)
202 #if !defined(GNUNET_LOG_CALL_STATUS)
203 #define GNUNET_LOG_CALL_STATUS -1
207 * Log function that specifies an alternative component.
208 * This function should be used by plugins.
210 * @param kind how serious is the error?
211 * @param comp component responsible for generating the message
212 * @param message what is the message (format string)
213 * @param ... arguments for format string
216 GNUNET_log_from_nocheck (enum GNUNET_ErrorType kind, const char *comp,
217 const char *message, ...);
219 #if !defined(GNUNET_CULL_LOGGING)
220 #define GNUNET_log_from(kind,comp,...) do { int log_line = __LINE__;\
221 static int log_call_enabled = GNUNET_LOG_CALL_STATUS;\
222 if (GN_UNLIKELY(log_call_enabled == -1))\
223 log_call_enabled = GNUNET_get_log_call_status ((kind) & (~GNUNET_ERROR_TYPE_BULK), comp, __FILE__, __FUNCTION__, log_line);\
224 if (GN_UNLIKELY(skip_log > 0)) {skip_log--;}\
226 if (GN_UNLIKELY(log_call_enabled))\
227 GNUNET_log_from_nocheck (kind, comp, __VA_ARGS__);\
231 #define GNUNET_log(kind,...) do { int log_line = __LINE__;\
232 static int log_call_enabled = GNUNET_LOG_CALL_STATUS;\
233 if (GN_UNLIKELY(log_call_enabled == -1))\
234 log_call_enabled = GNUNET_get_log_call_status ((kind) & (~GNUNET_ERROR_TYPE_BULK), NULL, __FILE__, __FUNCTION__, log_line);\
235 if (GN_UNLIKELY(skip_log > 0)) {skip_log--;}\
237 if (GN_UNLIKELY(log_call_enabled))\
238 GNUNET_log_nocheck (kind, __VA_ARGS__);\
242 #define GNUNET_log(...)
243 #define GNUNET_log_from(...)
247 * Ignore the next n calls to the log function.
249 * @param n number of log calls to ignore
250 * @param check_reset GNUNET_YES to assert that the log skip counter is currently zero
253 GNUNET_log_skip (unsigned int n, int check_reset);
259 * @param comp default component to use
260 * @param loglevel what types of messages should be logged
261 * @param logfile change logging to logfile (use NULL to keep stderr)
262 * @return GNUNET_OK on success, GNUNET_SYSERR if logfile could not be opened
265 GNUNET_log_setup (const char *comp, const char *loglevel, const char *logfile);
269 * Add a custom logger.
271 * @param logger log function
272 * @param logger_cls closure for logger
275 GNUNET_logger_add (GNUNET_Logger logger, void *logger_cls);
279 * Remove a custom logger.
281 * @param logger log function
282 * @param logger_cls closure for logger
285 GNUNET_logger_remove (GNUNET_Logger logger, void *logger_cls);
289 * Convert a hash value to a string (for printing debug messages).
290 * This is one of the very few calls in the entire API that is
293 * @param hc the hash code
297 GNUNET_h2s (const GNUNET_HashCode * hc);
301 * Convert a hash value to a string (for printing debug messages).
302 * This prints all 104 characters of a hashcode!
303 * This is one of the very few calls in the entire API that is
306 * @param hc the hash code
310 GNUNET_h2s_full (const GNUNET_HashCode * hc);
314 * Convert a peer identity to a string (for printing debug messages).
315 * This is one of the very few calls in the entire API that is
318 * @param pid the peer identity
319 * @return string form of the pid; will be overwritten by next
320 * call to GNUNET_i2s.
323 GNUNET_i2s (const struct GNUNET_PeerIdentity *pid);
327 * Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string
328 * (for printing debug messages). This is one of the very few calls
329 * in the entire API that is NOT reentrant!
331 * @param addr the address
332 * @param addrlen the length of the address
333 * @return nicely formatted string for the address
334 * will be overwritten by next call to GNUNET_a2s.
337 GNUNET_a2s (const struct sockaddr *addr, socklen_t addrlen);
340 * Convert error type to string.
342 * @param kind type to convert
343 * @return string corresponding to the type
346 GNUNET_error_type_to_string (enum GNUNET_ErrorType kind);
350 * Use this for fatal errors that cannot be handled
352 #define GNUNET_assert(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); abort(); } } while(0)
355 * Use this for fatal errors that cannot be handled
357 #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)
360 * Use this for internal assertion violations that are
361 * not fatal (can be handled) but should not occur.
363 #define GNUNET_break(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); } } while(0)
366 * Use this for assertion violations caused by other
367 * peers (i.e. protocol violations). We do not want to
368 * confuse end-users (say, some other peer runs an
369 * older, broken or incompatible GNUnet version), but
370 * we still want to see these problems during
371 * development and testing. "OP == other peer".
373 #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)
376 * Log an error message at log-level 'level' that indicates
377 * a failure of the command 'cmd' with the message given
378 * by strerror(errno).
380 #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)
383 * Log an error message at log-level 'level' that indicates
384 * a failure of the command 'cmd' with the message given
385 * by strerror(errno).
387 #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)
389 /* ************************* endianess conversion ****************** */
392 * Convert a long-long to host-byte-order.
393 * @param n the value in network byte order
394 * @return the same value in host byte order
397 GNUNET_ntohll (unsigned long long n);
400 * Convert a long long to network-byte-order.
401 * @param n the value in host byte order
402 * @return the same value in network byte order
405 GNUNET_htonll (unsigned long long n);
408 /* ************************* allocation functions ****************** */
411 * Maximum allocation with GNUNET_malloc macro.
413 #define GNUNET_MAX_MALLOC_CHECKED (1024 * 1024 * 40)
416 * Wrapper around malloc. Allocates size bytes of memory.
417 * The memory will be zero'ed out.
419 * @param size the number of bytes to allocate, must be
420 * smaller than 40 MB.
421 * @return pointer to size bytes of memory, never NULL (!)
423 #define GNUNET_malloc(size) GNUNET_xmalloc_(size, __FILE__, __LINE__)
426 * Allocate and initialize a block of memory.
428 * @param buf data to initalize the block with
429 * @param size the number of bytes in buf (and size of the allocation)
430 * @return pointer to size bytes of memory, never NULL (!)
432 #define GNUNET_memdup(buf,size) GNUNET_xmemdup_(buf, size, __FILE__, __LINE__)
435 * Wrapper around malloc. Allocates size bytes of memory.
436 * The memory will be zero'ed out.
438 * @param size the number of bytes to allocate
439 * @return pointer to size bytes of memory, NULL if we do not have enough memory
441 #define GNUNET_malloc_large(size) GNUNET_xmalloc_unchecked_(size, __FILE__, __LINE__)
444 * Wrapper around realloc. Rellocates size bytes of memory.
446 * @param ptr the pointer to reallocate
447 * @param size the number of bytes to reallocate
448 * @return pointer to size bytes of memory
450 #define GNUNET_realloc(ptr, size) GNUNET_xrealloc_(ptr, size, __FILE__, __LINE__)
453 * Wrapper around free. Frees the memory referred to by ptr.
454 * Note that is is generally better to free memory that was
455 * allocated with GNUNET_array_grow using GNUNET_array_grow(mem, size, 0) instead of GNUNET_free.
457 * @param ptr location where to free the memory. ptr must have
458 * been returned by GNUNET_strdup, GNUNET_strndup, GNUNET_malloc or GNUNET_array_grow earlier.
460 #define GNUNET_free(ptr) GNUNET_xfree_(ptr, __FILE__, __LINE__)
463 * Free the memory pointed to by ptr if ptr is not NULL.
464 * Equivalent to if (ptr!=null)GNUNET_free(ptr).
466 * @param ptr the location in memory to free
468 #define GNUNET_free_non_null(ptr) do { void * __x__ = ptr; if (__x__ != NULL) { GNUNET_free(__x__); } } while(0)
471 * Wrapper around GNUNET_strdup. Makes a copy of the zero-terminated string
474 * @param a pointer to a zero-terminated string
475 * @return a copy of the string including zero-termination
477 #define GNUNET_strdup(a) GNUNET_xstrdup_(a,__FILE__,__LINE__)
480 * Wrapper around GNUNET_strndup. Makes a partial copy of the string
483 * @param a pointer to a string
484 * @param length of the string to duplicate
485 * @return a partial copy of the string including zero-termination
487 #define GNUNET_strndup(a,length) GNUNET_xstrndup_(a,length,__FILE__,__LINE__)
490 * Grow a well-typed (!) array. This is a convenience
491 * method to grow a vector <tt>arr</tt> of size <tt>size</tt>
492 * to the new (target) size <tt>tsize</tt>.
495 * Example (simple, well-typed stack):
498 * static struct foo * myVector = NULL;
499 * static int myVecLen = 0;
501 * static void push(struct foo * elem) {
502 * GNUNET_array_grow(myVector, myVecLen, myVecLen+1);
503 * memcpy(&myVector[myVecLen-1], elem, sizeof(struct foo));
506 * static void pop(struct foo * elem) {
507 * if (myVecLen == 0) die();
508 * memcpy(elem, myVector[myVecLen-1], sizeof(struct foo));
509 * GNUNET_array_grow(myVector, myVecLen, myVecLen-1);
513 * @param arr base-pointer of the vector, may be NULL if size is 0;
514 * will be updated to reflect the new address. The TYPE of
515 * arr is important since size is the number of elements and
516 * not the size in bytes
517 * @param size the number of elements in the existing vector (number
518 * of elements to copy over)
519 * @param tsize the target size for the resulting vector, use 0 to
520 * free the vector (then, arr will be NULL afterwards).
522 #define GNUNET_array_grow(arr,size,tsize) GNUNET_xgrow_((void**)&arr, sizeof(arr[0]), &size, tsize, __FILE__, __LINE__)
525 * Append an element to a list (growing the
528 #define GNUNET_array_append(arr,size,element) do { GNUNET_array_grow(arr,size,size+1); arr[size-1] = element; } while(0)
531 * Like snprintf, just aborts if the buffer is of insufficient size.
533 * @param buf pointer to buffer that is written to
534 * @param size number of bytes in buf
535 * @param format format strings
536 * @param ... data for format string
537 * @return number of bytes written to buf or negative value on error
540 GNUNET_snprintf (char *buf, size_t size, const char *format, ...);
544 * Like asprintf, just portable.
546 * @param buf set to a buffer of sufficient size (allocated, caller must free)
547 * @param format format string (see printf, fprintf, etc.)
548 * @param ... data for format string
549 * @return number of bytes in "*buf" excluding 0-termination
552 GNUNET_asprintf (char **buf, const char *format, ...);
555 /* ************** internal implementations, use macros above! ************** */
558 * Allocate memory. Checks the return value, aborts if no more
559 * memory is available. Don't use GNUNET_xmalloc_ directly. Use the
560 * GNUNET_malloc macro.
561 * The memory will be zero'ed out.
563 * @param size number of bytes to allocate
564 * @param filename where is this call being made (for debugging)
565 * @param linenumber line where this call is being made (for debugging)
566 * @return allocated memory, never NULL
569 GNUNET_xmalloc_ (size_t size, const char *filename, int linenumber);
573 * Allocate and initialize memory. Checks the return value, aborts if no more
574 * memory is available. Don't use GNUNET_xmemdup_ directly. Use the
575 * GNUNET_memdup macro.
577 * @param buf buffer to initialize from (must contain size bytes)
578 * @param size number of bytes to allocate
579 * @param filename where is this call being made (for debugging)
580 * @param linenumber line where this call is being made (for debugging)
581 * @return allocated memory, never NULL
584 GNUNET_xmemdup_ (const void *buf, size_t size, const char *filename,
589 * Allocate memory. This function does not check if the allocation
590 * request is within reasonable bounds, allowing allocations larger
591 * than 40 MB. If you don't expect the possibility of very large
592 * allocations, use GNUNET_malloc instead. The memory will be zero'ed
595 * @param size number of bytes to allocate
596 * @param filename where is this call being made (for debugging)
597 * @param linenumber line where this call is being made (for debugging)
598 * @return pointer to size bytes of memory, NULL if we do not have enough memory
601 GNUNET_xmalloc_unchecked_ (size_t size, const char *filename, int linenumber);
604 * Reallocate memory. Checks the return value, aborts if no more
605 * memory is available.
608 GNUNET_xrealloc_ (void *ptr, size_t n, const char *filename, int linenumber);
611 * Free memory. Merely a wrapper for the case that we
612 * want to keep track of allocations. Don't use GNUNET_xfree_
613 * directly. Use the GNUNET_free macro.
615 * @param ptr pointer to memory to free
616 * @param filename where is this call being made (for debugging)
617 * @param linenumber line where this call is being made (for debugging)
620 GNUNET_xfree_ (void *ptr, const char *filename, int linenumber);
624 * Dup a string. Don't call GNUNET_xstrdup_ directly. Use the GNUNET_strdup macro.
625 * @param str string to duplicate
626 * @param filename where is this call being made (for debugging)
627 * @param linenumber line where this call is being made (for debugging)
628 * @return the duplicated string
631 GNUNET_xstrdup_ (const char *str, const char *filename, int linenumber);
634 * Dup partially a string. Don't call GNUNET_xstrndup_ directly. Use the GNUNET_strndup macro.
636 * @param str string to duplicate
637 * @param len length of the string to duplicate
638 * @param filename where is this call being made (for debugging)
639 * @param linenumber line where this call is being made (for debugging)
640 * @return the duplicated string
643 GNUNET_xstrndup_ (const char *str, size_t len, const char *filename,
647 * Grow an array, the new elements are zeroed out.
648 * Grows old by (*oldCount-newCount)*elementSize
649 * bytes and sets *oldCount to newCount.
651 * Don't call GNUNET_xgrow_ directly. Use the GNUNET_array_grow macro.
653 * @param old address of the pointer to the array
655 * @param elementSize the size of the elements of the array
656 * @param oldCount address of the number of elements in the *old array
657 * @param newCount number of elements in the new array, may be 0 (then *old will be NULL afterwards)
658 * @param filename where is this call being made (for debugging)
659 * @param linenumber line where this call is being made (for debugging)
662 GNUNET_xgrow_ (void **old, size_t elementSize, unsigned int *oldCount,
663 unsigned int newCount, const char *filename, int linenumber);
667 * Create a copy of the given message.
669 * @param msg message to copy
670 * @return duplicate of the message
672 struct GNUNET_MessageHeader *
673 GNUNET_copy_message (const struct GNUNET_MessageHeader *msg);
676 #if __STDC_VERSION__ < 199901L
678 #define __func__ __FUNCTION__
680 #define __func__ "<unknown>"
684 #endif /*GNUNET_COMMON_H_ */