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 0x00090000
55 * Named constants for return values. The following
56 * invariants hold: "GNUNET_NO == 0" (to allow "if (GNUNET_NO)")
57 * "GNUNET_OK != GNUNET_SYSERR", "GNUNET_OK != GNUNET_NO", "GNUNET_NO != GNUNET_SYSERR"
58 * and finally "GNUNET_YES != GNUNET_NO".
61 #define GNUNET_SYSERR -1
65 #define GNUNET_MIN(a,b) (((a) < (b)) ? (a) : (b))
67 #define GNUNET_MAX(a,b) (((a) > (b)) ? (a) : (b))
73 # if __BYTE_ORDER == __LITTLE_ENDIAN
74 # define GNUNET_htobe16(x) __bswap_16 (x)
75 # define GNUNET_htole16(x) (x)
76 # define GNUNET_be16toh(x) __bswap_16 (x)
77 # define GNUNET_le16toh(x) (x)
79 # define GNUNET_htobe32(x) __bswap_32 (x)
80 # define GNUNET_htole32(x) (x)
81 # define GNUNET_be32toh(x) __bswap_32 (x)
82 # define GNUNET_le32toh(x) (x)
84 # define GNUNET_htobe64(x) __bswap_64 (x)
85 # define GNUNET_htole64(x) (x)
86 # define GNUNET_be64toh(x) __bswap_64 (x)
87 # define GNUNET_le64toh(x) (x)
89 # if __BYTE_ORDER == __BIG_ENDIAN
90 # define GNUNET_htobe16(x) (x)
91 # define GNUNET_htole16(x) __bswap_16 (x)
92 # define GNUNET_be16toh(x) (x)
93 # define GNUNET_le16toh(x) __bswap_16 (x)
95 # define GNUNET_htobe32(x) (x)
96 # define GNUNET_htole32(x) __bswap_32 (x)
97 # define GNUNET_be32toh(x) (x)
98 # define GNUNET_le32toh(x) __bswap_32 (x)
100 # define GNUNET_htobe64(x) (x)
101 # define GNUNET_htole64(x) __bswap_64 (x)
102 # define GNUNET_be64toh(x) (x)
103 # define GNUNET_le64toh(x) __bswap_64 (x)
110 * gcc-ism to get packed structs.
112 #define GNUNET_PACKED __attribute__((packed))
115 * gcc-ism to document unused arguments
117 #define GNUNET_UNUSED __attribute__((unused))
120 /* ************************ super-general types *********************** */
123 * Header for all communications.
125 struct GNUNET_MessageHeader
129 * The length of the struct (in bytes, including the length field itself),
130 * in big-endian format.
132 uint16_t size GNUNET_PACKED;
135 * The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
137 uint16_t type GNUNET_PACKED;
143 * @brief 512-bit hashcode
147 uint32_t bits[512 / 8 / sizeof (uint32_t)]; /* = 16 */
153 * The identity of the host (basically the SHA-512 hashcode of
156 struct GNUNET_PeerIdentity
158 GNUNET_HashCode hashPubKey GNUNET_PACKED;
163 * Function called with a filename.
166 * @param filename complete filename (absolute path)
167 * @return GNUNET_OK to continue to iterate,
168 * GNUNET_SYSERR to abort iteration with error!
170 typedef int (*GNUNET_FileNameCallback) (void *cls, const char *filename);
173 /* ****************************** logging ***************************** */
178 enum GNUNET_ErrorType
180 GNUNET_ERROR_TYPE_UNSPECIFIED = -1,
181 GNUNET_ERROR_TYPE_NONE = 0,
182 GNUNET_ERROR_TYPE_ERROR = 1,
183 GNUNET_ERROR_TYPE_WARNING = 2,
184 GNUNET_ERROR_TYPE_INFO = 4,
185 GNUNET_ERROR_TYPE_DEBUG = 8,
186 GNUNET_ERROR_TYPE_INVALID = 16,
187 GNUNET_ERROR_TYPE_BULK = 32
192 * User-defined handler for log messages.
195 * @param kind severeity
196 * @param component what component is issuing the message?
197 * @param date when was the message logged?
198 * @param message what is the message
200 typedef void (*GNUNET_Logger) (void *cls, enum GNUNET_ErrorType kind,
201 const char *component, const char *date,
202 const char *message);
206 * Number of log calls to ignore.
208 extern unsigned int skip_log;
210 #if !defined(GNUNET_CULL_LOGGING)
212 GNUNET_get_log_call_status (int caller_level, const char *comp,
213 const char *file, const char *function, int line);
218 * @param kind how serious is the error?
219 * @param message what is the message (format string)
220 * @param ... arguments for format string
223 GNUNET_log_nocheck (enum GNUNET_ErrorType kind, const char *message, ...);
226 #if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
227 #define _GNUNET_BOOLEAN_EXPR(expr) \
229 int _gnunet_boolean_var_; \
231 _gnunet_boolean_var_ = 1; \
233 _gnunet_boolean_var_ = 0; \
234 _gnunet_boolean_var_; \
236 #define GN_LIKELY(expr) (__builtin_expect (_GNUNET_BOOLEAN_EXPR(expr), 1))
237 #define GN_UNLIKELY(expr) (__builtin_expect (_GNUNET_BOOLEAN_EXPR(expr), 0))
239 #define GN_LIKELY(expr) (expr)
240 #define GN_UNLIKELY(expr) (expr)
243 #if !defined(GNUNET_LOG_CALL_STATUS)
244 #define GNUNET_LOG_CALL_STATUS -1
248 * Log function that specifies an alternative component.
249 * This function should be used by plugins.
251 * @param kind how serious is the error?
252 * @param comp component responsible for generating the message
253 * @param message what is the message (format string)
254 * @param ... arguments for format string
257 GNUNET_log_from_nocheck (enum GNUNET_ErrorType kind, const char *comp,
258 const char *message, ...);
260 #if !defined(GNUNET_CULL_LOGGING)
261 #define GNUNET_log_from(kind,comp,...) do { int log_line = __LINE__;\
262 static int log_call_enabled = GNUNET_LOG_CALL_STATUS;\
263 if (GN_UNLIKELY(log_call_enabled == -1))\
264 log_call_enabled = GNUNET_get_log_call_status ((kind) & (~GNUNET_ERROR_TYPE_BULK), comp, __FILE__, __FUNCTION__, log_line);\
265 if (GN_UNLIKELY(skip_log > 0)) {skip_log--;}\
267 if (GN_UNLIKELY(log_call_enabled))\
268 GNUNET_log_from_nocheck (kind, comp, __VA_ARGS__);\
272 #define GNUNET_log(kind,...) do { int log_line = __LINE__;\
273 static int log_call_enabled = GNUNET_LOG_CALL_STATUS;\
274 if (GN_UNLIKELY(log_call_enabled == -1))\
275 log_call_enabled = GNUNET_get_log_call_status ((kind) & (~GNUNET_ERROR_TYPE_BULK), NULL, __FILE__, __FUNCTION__, log_line);\
276 if (GN_UNLIKELY(skip_log > 0)) {skip_log--;}\
278 if (GN_UNLIKELY(log_call_enabled))\
279 GNUNET_log_nocheck (kind, __VA_ARGS__);\
283 #define GNUNET_log(...)
284 #define GNUNET_log_from(...)
289 * Abort the process, generate a core dump if possible.
295 * Ignore the next n calls to the log function.
297 * @param n number of log calls to ignore
298 * @param check_reset GNUNET_YES to assert that the log skip counter is currently zero
301 GNUNET_log_skip (unsigned int n, int check_reset);
307 * @param comp default component to use
308 * @param loglevel what types of messages should be logged
309 * @param logfile change logging to logfile (use NULL to keep stderr)
310 * @return GNUNET_OK on success, GNUNET_SYSERR if logfile could not be opened
313 GNUNET_log_setup (const char *comp, const char *loglevel, const char *logfile);
317 * Add a custom logger.
319 * @param logger log function
320 * @param logger_cls closure for logger
323 GNUNET_logger_add (GNUNET_Logger logger, void *logger_cls);
327 * Remove a custom logger.
329 * @param logger log function
330 * @param logger_cls closure for logger
333 GNUNET_logger_remove (GNUNET_Logger logger, void *logger_cls);
337 * Convert a hash value to a string (for printing debug messages).
338 * This is one of the very few calls in the entire API that is
341 * @param hc the hash code
345 GNUNET_h2s (const GNUNET_HashCode * hc);
349 * Convert a hash value to a string (for printing debug messages).
350 * This prints all 104 characters of a hashcode!
351 * This is one of the very few calls in the entire API that is
354 * @param hc the hash code
358 GNUNET_h2s_full (const GNUNET_HashCode * hc);
362 * Convert a peer identity to a string (for printing debug messages).
363 * This is one of the very few calls in the entire API that is
366 * @param pid the peer identity
367 * @return string form of the pid; will be overwritten by next
368 * call to GNUNET_i2s.
371 GNUNET_i2s (const struct GNUNET_PeerIdentity *pid);
375 * Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string
376 * (for printing debug messages). This is one of the very few calls
377 * in the entire API that is NOT reentrant!
379 * @param addr the address
380 * @param addrlen the length of the address
381 * @return nicely formatted string for the address
382 * will be overwritten by next call to GNUNET_a2s.
385 GNUNET_a2s (const struct sockaddr *addr, socklen_t addrlen);
388 * Convert error type to string.
390 * @param kind type to convert
391 * @return string corresponding to the type
394 GNUNET_error_type_to_string (enum GNUNET_ErrorType kind);
398 * Use this for fatal errors that cannot be handled
400 #define GNUNET_assert(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); GNUNET_abort(); } } while(0)
403 * Use this for fatal errors that cannot be handled
405 #define GNUNET_assert_at(cond, f, l) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), f, l); GNUNET_abort(); } } while(0)
408 * Use this for internal assertion violations that are
409 * not fatal (can be handled) but should not occur.
411 #define GNUNET_break(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); } } while(0)
414 * Use this for assertion violations caused by other
415 * peers (i.e. protocol violations). We do not want to
416 * confuse end-users (say, some other peer runs an
417 * older, broken or incompatible GNUnet version), but
418 * we still want to see these problems during
419 * development and testing. "OP == other peer".
421 #define GNUNET_break_op(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK, _("External protocol violation detected at %s:%d.\n"), __FILE__, __LINE__); } } while(0)
424 * Log an error message at log-level 'level' that indicates
425 * a failure of the command 'cmd' with the message given
426 * by strerror(errno).
428 #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)
431 * Log an error message at log-level 'level' that indicates
432 * a failure of the command 'cmd' with the message given
433 * by strerror(errno).
435 #define GNUNET_log_from_strerror(level, component, cmd) do { GNUNET_log_from (level, component, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, STRERROR(errno)); } while(0)
438 * Log an error message at log-level 'level' that indicates
439 * a failure of the command 'cmd' with the message given
440 * by strerror(errno).
442 #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)
445 * Log an error message at log-level 'level' that indicates
446 * a failure of the command 'cmd' with the message given
447 * by strerror(errno).
449 #define GNUNET_log_from_strerror_file(level, component, cmd, filename) do { GNUNET_log_from (level, component, _("`%s' failed on file `%s' at %s:%d with error: %s\n"), cmd, filename,__FILE__, __LINE__, STRERROR(errno)); } while(0)
451 /* ************************* endianess conversion ****************** */
454 * Convert unsigned 64-bit integer to host-byte-order.
455 * @param n the value in network byte order
456 * @return the same value in host byte order
459 GNUNET_ntohll (uint64_t n);
462 * Convert unsigned 64-bit integer to network-byte-order.
463 * @param n the value in host byte order
464 * @return the same value in network byte order
467 GNUNET_htonll (uint64_t n);
470 /* ************************* allocation functions ****************** */
473 * Maximum allocation with GNUNET_malloc macro.
475 #define GNUNET_MAX_MALLOC_CHECKED (1024 * 1024 * 40)
478 * Wrapper around malloc. Allocates size bytes of memory.
479 * The memory will be zero'ed out.
481 * @param size the number of bytes to allocate, must be
482 * smaller than 40 MB.
483 * @return pointer to size bytes of memory, never NULL (!)
485 #define GNUNET_malloc(size) GNUNET_xmalloc_(size, __FILE__, __LINE__)
488 * Allocate and initialize a block of memory.
490 * @param buf data to initalize the block with
491 * @param size the number of bytes in buf (and size of the allocation)
492 * @return pointer to size bytes of memory, never NULL (!)
494 #define GNUNET_memdup(buf,size) GNUNET_xmemdup_(buf, size, __FILE__, __LINE__)
497 * Wrapper around malloc. Allocates size bytes of memory.
498 * The memory will be zero'ed out.
500 * @param size the number of bytes to allocate
501 * @return pointer to size bytes of memory, NULL if we do not have enough memory
503 #define GNUNET_malloc_large(size) GNUNET_xmalloc_unchecked_(size, __FILE__, __LINE__)
506 * Wrapper around realloc. Rellocates size bytes of memory.
508 * @param ptr the pointer to reallocate
509 * @param size the number of bytes to reallocate
510 * @return pointer to size bytes of memory
512 #define GNUNET_realloc(ptr, size) GNUNET_xrealloc_(ptr, size, __FILE__, __LINE__)
515 * Wrapper around free. Frees the memory referred to by ptr.
516 * Note that is is generally better to free memory that was
517 * allocated with GNUNET_array_grow using GNUNET_array_grow(mem, size, 0) instead of GNUNET_free.
519 * @param ptr location where to free the memory. ptr must have
520 * been returned by GNUNET_strdup, GNUNET_strndup, GNUNET_malloc or GNUNET_array_grow earlier.
522 #define GNUNET_free(ptr) GNUNET_xfree_(ptr, __FILE__, __LINE__)
525 * Free the memory pointed to by ptr if ptr is not NULL.
526 * Equivalent to if (ptr!=null)GNUNET_free(ptr).
528 * @param ptr the location in memory to free
530 #define GNUNET_free_non_null(ptr) do { void * __x__ = ptr; if (__x__ != NULL) { GNUNET_free(__x__); } } while(0)
533 * Wrapper around GNUNET_strdup. Makes a copy of the zero-terminated string
536 * @param a pointer to a zero-terminated string
537 * @return a copy of the string including zero-termination
539 #define GNUNET_strdup(a) GNUNET_xstrdup_(a,__FILE__,__LINE__)
542 * Wrapper around GNUNET_strndup. Makes a partial copy of the string
545 * @param a pointer to a string
546 * @param length of the string to duplicate
547 * @return a partial copy of the string including zero-termination
549 #define GNUNET_strndup(a,length) GNUNET_xstrndup_(a,length,__FILE__,__LINE__)
552 * Grow a well-typed (!) array. This is a convenience
553 * method to grow a vector <tt>arr</tt> of size <tt>size</tt>
554 * to the new (target) size <tt>tsize</tt>.
557 * Example (simple, well-typed stack):
560 * static struct foo * myVector = NULL;
561 * static int myVecLen = 0;
563 * static void push(struct foo * elem) {
564 * GNUNET_array_grow(myVector, myVecLen, myVecLen+1);
565 * memcpy(&myVector[myVecLen-1], elem, sizeof(struct foo));
568 * static void pop(struct foo * elem) {
569 * if (myVecLen == 0) die();
570 * memcpy(elem, myVector[myVecLen-1], sizeof(struct foo));
571 * GNUNET_array_grow(myVector, myVecLen, myVecLen-1);
575 * @param arr base-pointer of the vector, may be NULL if size is 0;
576 * will be updated to reflect the new address. The TYPE of
577 * arr is important since size is the number of elements and
578 * not the size in bytes
579 * @param size the number of elements in the existing vector (number
580 * of elements to copy over)
581 * @param tsize the target size for the resulting vector, use 0 to
582 * free the vector (then, arr will be NULL afterwards).
584 #define GNUNET_array_grow(arr,size,tsize) GNUNET_xgrow_((void**)&arr, sizeof(arr[0]), &size, tsize, __FILE__, __LINE__)
587 * Append an element to a list (growing the
590 #define GNUNET_array_append(arr,size,element) do { GNUNET_array_grow(arr,size,size+1); arr[size-1] = element; } while(0)
593 * Like snprintf, just aborts if the buffer is of insufficient size.
595 * @param buf pointer to buffer that is written to
596 * @param size number of bytes in buf
597 * @param format format strings
598 * @param ... data for format string
599 * @return number of bytes written to buf or negative value on error
602 GNUNET_snprintf (char *buf, size_t size, const char *format, ...);
606 * Like asprintf, just portable.
608 * @param buf set to a buffer of sufficient size (allocated, caller must free)
609 * @param format format string (see printf, fprintf, etc.)
610 * @param ... data for format string
611 * @return number of bytes in "*buf" excluding 0-termination
614 GNUNET_asprintf (char **buf, const char *format, ...);
617 /* ************** internal implementations, use macros above! ************** */
620 * Allocate memory. Checks the return value, aborts if no more
621 * memory is available. Don't use GNUNET_xmalloc_ directly. Use the
622 * GNUNET_malloc macro.
623 * The memory will be zero'ed out.
625 * @param size number of bytes to allocate
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 allocated memory, never NULL
631 GNUNET_xmalloc_ (size_t size, const char *filename, int linenumber);
635 * Allocate and initialize memory. Checks the return value, aborts if no more
636 * memory is available. Don't use GNUNET_xmemdup_ directly. Use the
637 * GNUNET_memdup macro.
639 * @param buf buffer to initialize from (must contain size bytes)
640 * @param size number of bytes to allocate
641 * @param filename where is this call being made (for debugging)
642 * @param linenumber line where this call is being made (for debugging)
643 * @return allocated memory, never NULL
646 GNUNET_xmemdup_ (const void *buf, size_t size, const char *filename,
651 * Allocate memory. This function does not check if the allocation
652 * request is within reasonable bounds, allowing allocations larger
653 * than 40 MB. If you don't expect the possibility of very large
654 * allocations, use GNUNET_malloc instead. The memory will be zero'ed
657 * @param size number of bytes to allocate
658 * @param filename where is this call being made (for debugging)
659 * @param linenumber line where this call is being made (for debugging)
660 * @return pointer to size bytes of memory, NULL if we do not have enough memory
663 GNUNET_xmalloc_unchecked_ (size_t size, const char *filename, int linenumber);
666 * Reallocate memory. Checks the return value, aborts if no more
667 * memory is available.
670 GNUNET_xrealloc_ (void *ptr, size_t n, const char *filename, int linenumber);
673 * Free memory. Merely a wrapper for the case that we
674 * want to keep track of allocations. Don't use GNUNET_xfree_
675 * directly. Use the GNUNET_free macro.
677 * @param ptr pointer to memory to free
678 * @param filename where is this call being made (for debugging)
679 * @param linenumber line where this call is being made (for debugging)
682 GNUNET_xfree_ (void *ptr, const char *filename, int linenumber);
686 * Dup a string. Don't call GNUNET_xstrdup_ directly. Use the GNUNET_strdup macro.
687 * @param str string to duplicate
688 * @param filename where is this call being made (for debugging)
689 * @param linenumber line where this call is being made (for debugging)
690 * @return the duplicated string
693 GNUNET_xstrdup_ (const char *str, const char *filename, int linenumber);
696 * Dup partially a string. Don't call GNUNET_xstrndup_ directly. Use the GNUNET_strndup macro.
698 * @param str string to duplicate
699 * @param len length of the string to duplicate
700 * @param filename where is this call being made (for debugging)
701 * @param linenumber line where this call is being made (for debugging)
702 * @return the duplicated string
705 GNUNET_xstrndup_ (const char *str, size_t len, const char *filename,
709 * Grow an array, the new elements are zeroed out.
710 * Grows old by (*oldCount-newCount)*elementSize
711 * bytes and sets *oldCount to newCount.
713 * Don't call GNUNET_xgrow_ directly. Use the GNUNET_array_grow macro.
715 * @param old address of the pointer to the array
717 * @param elementSize the size of the elements of the array
718 * @param oldCount address of the number of elements in the *old array
719 * @param newCount number of elements in the new array, may be 0 (then *old will be NULL afterwards)
720 * @param filename where is this call being made (for debugging)
721 * @param linenumber line where this call is being made (for debugging)
724 GNUNET_xgrow_ (void **old, size_t elementSize, unsigned int *oldCount,
725 unsigned int newCount, const char *filename, int linenumber);
729 * Create a copy of the given message.
731 * @param msg message to copy
732 * @return duplicate of the message
734 struct GNUNET_MessageHeader *
735 GNUNET_copy_message (const struct GNUNET_MessageHeader *msg);
738 #if __STDC_VERSION__ < 199901L
740 #define __func__ __FUNCTION__
742 #define __func__ "<unknown>"
746 #endif /*GNUNET_COMMON_H_ */