util.h
上传用户:awang829
上传日期:2019-07-14
资源大小:2356k
文件大小:12k
- /* Copyright (c) 2003-2004, Roger Dingledine
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2009, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- /**
- * file util.h
- * brief Headers for util.c
- **/
- #ifndef _TOR_UTIL_H
- #define _TOR_UTIL_H
- #include "orconfig.h"
- #include "torint.h"
- #include "compat.h"
- #include <stdio.h>
- #include <stdlib.h>
- #ifndef O_BINARY
- #define O_BINARY 0
- #endif
- #ifndef O_TEXT
- #define O_TEXT 0
- #endif
- /* Replace assert() with a variant that sends failures to the log before
- * calling assert() normally.
- */
- #ifdef NDEBUG
- /* Nobody should ever want to build with NDEBUG set. 99% of our asserts will
- * be outside the critical path anyway, so it's silly to disable bug-checking
- * throughout the entire program just because a few asserts are slowing you
- * down. Profile, optimize the critical path, and keep debugging on.
- *
- * And I'm not just saying that because some of our asserts check
- * security-critical properties.
- */
- #error "Sorry; we don't support building with NDEBUG."
- #endif
- /** Like assert(3), but send assertion failures to the log as well as to
- * stderr. */
- #define tor_assert(expr) STMT_BEGIN
- if (PREDICT_UNLIKELY(!(expr))) {
- log(LOG_ERR, LD_BUG, "%s:%d: %s: Assertion %s failed; aborting.",
- _SHORT_FILE_, __LINE__, __func__, #expr);
- fprintf(stderr,"%s:%d %s: Assertion %s failed; aborting.n",
- _SHORT_FILE_, __LINE__, __func__, #expr);
- abort();
- } STMT_END
- /* If we're building with dmalloc, we want all of our memory allocation
- * functions to take an extra file/line pair of arguments. If not, not.
- * We define DMALLOC_PARAMS to the extra parameters to insert in the
- * function prototypes, and DMALLOC_ARGS to the extra arguments to add
- * to calls. */
- #ifdef USE_DMALLOC
- #define DMALLOC_PARAMS , const char *file, const int line
- #define DMALLOC_ARGS , _SHORT_FILE_, __LINE__
- #else
- #define DMALLOC_PARAMS
- #define DMALLOC_ARGS
- #endif
- /** Define this if you want Tor to crash when any problem comes up,
- * so you can get a coredump and track things down. */
- // #define tor_fragile_assert() tor_assert(0)
- #define tor_fragile_assert()
- /* Memory management */
- void *_tor_malloc(size_t size DMALLOC_PARAMS) ATTR_MALLOC;
- void *_tor_malloc_zero(size_t size DMALLOC_PARAMS) ATTR_MALLOC;
- void *_tor_malloc_roundup(size_t *size DMALLOC_PARAMS) ATTR_MALLOC;
- void *_tor_realloc(void *ptr, size_t size DMALLOC_PARAMS);
- char *_tor_strdup(const char *s DMALLOC_PARAMS) ATTR_MALLOC ATTR_NONNULL((1));
- char *_tor_strndup(const char *s, size_t n DMALLOC_PARAMS)
- ATTR_MALLOC ATTR_NONNULL((1));
- void *_tor_memdup(const void *mem, size_t len DMALLOC_PARAMS)
- ATTR_MALLOC ATTR_NONNULL((1));
- void _tor_free(void *mem);
- #ifdef USE_DMALLOC
- extern int dmalloc_free(const char *file, const int line, void *pnt,
- const int func_id);
- #define tor_free(p) STMT_BEGIN
- if (PREDICT_LIKELY((p)!=NULL)) {
- dmalloc_free(_SHORT_FILE_, __LINE__, (p), 0);
- (p)=NULL;
- }
- STMT_END
- #else
- /** Release memory allocated by tor_malloc, tor_realloc, tor_strdup, etc.
- * Unlike the free() function, tor_free() will still work on NULL pointers,
- * and it sets the pointer value to NULL after freeing it.
- *
- * This is a macro. If you need a function pointer to release memory from
- * tor_malloc(), use _tor_free().
- */
- #define tor_free(p) STMT_BEGIN
- if (PREDICT_LIKELY((p)!=NULL)) {
- free(p);
- (p)=NULL;
- }
- STMT_END
- #endif
- #define tor_malloc(size) _tor_malloc(size DMALLOC_ARGS)
- #define tor_malloc_zero(size) _tor_malloc_zero(size DMALLOC_ARGS)
- #define tor_malloc_roundup(szp) _tor_malloc_roundup(szp DMALLOC_ARGS)
- #define tor_realloc(ptr, size) _tor_realloc(ptr, size DMALLOC_ARGS)
- #define tor_strdup(s) _tor_strdup(s DMALLOC_ARGS)
- #define tor_strndup(s, n) _tor_strndup(s, n DMALLOC_ARGS)
- #define tor_memdup(s, n) _tor_memdup(s, n DMALLOC_ARGS)
- void tor_log_mallinfo(int severity);
- /** Return the offset of <b>member</b> within the type <b>tp</b>, in bytes */
- #if defined(__GNUC__) && __GNUC__ > 3
- #define STRUCT_OFFSET(tp, member) __builtin_offsetof(tp, member)
- #else
- #define STRUCT_OFFSET(tp, member)
- ((off_t) (((char*)&((tp*)0)->member)-(char*)0))
- #endif
- /** Macro: yield a pointer to the field at position <b>off</b> within the
- * structure <b>st</b>. Example:
- * <pre>
- * struct a { int foo; int bar; } x;
- * off_t bar_offset = STRUCT_OFFSET(struct a, bar);
- * int *bar_p = STRUCT_VAR_P(&x, bar_offset);
- * *bar_p = 3;
- * </pre>
- */
- #define STRUCT_VAR_P(st, off) ((void*) ( ((char*)(st)) + (off) ) )
- /** Macro: yield a pointer to an enclosing structure given a pointer to
- * a substructure at offset <b>off</b>. Example:
- * <pre>
- * struct base { ... };
- * struct subtype { int x; struct base b; } x;
- * struct base *bp = &x.base;
- * struct *sp = SUBTYPE_P(bp, struct subtype, b);
- * </pre>
- */
- #define SUBTYPE_P(p, subtype, basemember)
- ((void*) ( ((char*)(p)) - STRUCT_OFFSET(subtype, basemember) ))
- /* Logic */
- /** Macro: true if two values have the same boolean value. */
- #define bool_eq(a,b) (!(a)==!(b))
- /** Macro: true if two values have different boolean values. */
- #define bool_neq(a,b) (!(a)!=!(b))
- /* Math functions */
- int tor_log2(uint64_t u64) ATTR_CONST;
- uint64_t round_to_power_of_2(uint64_t u64);
- /* String manipulation */
- /** Allowable characters in a hexadecimal string. */
- #define HEX_CHARACTERS "0123456789ABCDEFabcdef"
- void tor_strlower(char *s) ATTR_NONNULL((1));
- void tor_strupper(char *s) ATTR_NONNULL((1));
- int tor_strisprint(const char *s) ATTR_PURE ATTR_NONNULL((1));
- int tor_strisnonupper(const char *s) ATTR_PURE ATTR_NONNULL((1));
- int strcmpstart(const char *s1, const char *s2) ATTR_PURE ATTR_NONNULL((1,2));
- int strcmp_len(const char *s1, const char *s2, size_t len)
- ATTR_PURE ATTR_NONNULL((1,2));
- int strcasecmpstart(const char *s1, const char *s2)
- ATTR_PURE ATTR_NONNULL((1,2));
- int strcmpend(const char *s1, const char *s2) ATTR_PURE ATTR_NONNULL((1,2));
- int strcasecmpend(const char *s1, const char *s2)
- ATTR_PURE ATTR_NONNULL((1,2));
- int memcmpstart(const void *mem, size_t memlen,
- const char *prefix) ATTR_PURE;
- void tor_strstrip(char *s, const char *strip) ATTR_NONNULL((1,2));
- long tor_parse_long(const char *s, int base, long min,
- long max, int *ok, char **next);
- unsigned long tor_parse_ulong(const char *s, int base, unsigned long min,
- unsigned long max, int *ok, char **next);
- uint64_t tor_parse_uint64(const char *s, int base, uint64_t min,
- uint64_t max, int *ok, char **next);
- const char *hex_str(const char *from, size_t fromlen) ATTR_NONNULL((1));
- const char *eat_whitespace(const char *s) ATTR_PURE;
- const char *eat_whitespace_eos(const char *s, const char *eos) ATTR_PURE;
- const char *eat_whitespace_no_nl(const char *s) ATTR_PURE;
- const char *eat_whitespace_eos_no_nl(const char *s, const char *eos) ATTR_PURE;
- const char *find_whitespace(const char *s) ATTR_PURE;
- const char *find_whitespace_eos(const char *s, const char *eos) ATTR_PURE;
- int tor_mem_is_zero(const char *mem, size_t len) ATTR_PURE;
- int tor_digest_is_zero(const char *digest) ATTR_PURE;
- char *esc_for_log(const char *string) ATTR_MALLOC;
- const char *escaped(const char *string);
- struct smartlist_t;
- void wrap_string(struct smartlist_t *out, const char *string, size_t width,
- const char *prefix0, const char *prefixRest);
- int tor_vsscanf(const char *buf, const char *pattern, va_list ap);
- int tor_sscanf(const char *buf, const char *pattern, ...)
- #ifdef __GNUC__
- __attribute__((format(scanf, 2, 3)))
- #endif
- ;
- int hex_decode_digit(char c);
- void base16_encode(char *dest, size_t destlen, const char *src, size_t srclen);
- int base16_decode(char *dest, size_t destlen, const char *src, size_t srclen);
- /* Time helpers */
- long tv_udiff(const struct timeval *start, const struct timeval *end);
- time_t tor_timegm(struct tm *tm);
- #define RFC1123_TIME_LEN 29
- void format_rfc1123_time(char *buf, time_t t);
- int parse_rfc1123_time(const char *buf, time_t *t);
- #define ISO_TIME_LEN 19
- void format_local_iso_time(char *buf, time_t t);
- void format_iso_time(char *buf, time_t t);
- int parse_iso_time(const char *buf, time_t *t);
- int parse_http_time(const char *buf, struct tm *tm);
- int format_time_interval(char *out, size_t out_len, long interval);
- /* Cached time */
- #ifdef TIME_IS_FAST
- #define approx_time() time(NULL)
- #define update_approx_time(t) STMT_NIL
- #else
- time_t approx_time(void);
- void update_approx_time(time_t now);
- #endif
- /* Fuzzy time. */
- void ftime_set_maximum_sloppiness(int seconds);
- void ftime_set_estimated_skew(int seconds);
- /* typedef struct ftime_t { time_t earliest; time_t latest; } ftime_t; */
- /* void ftime_get_window(time_t now, ftime_t *ft_out); */
- int ftime_maybe_after(time_t now, time_t when);
- int ftime_maybe_before(time_t now, time_t when);
- int ftime_definitely_after(time_t now, time_t when);
- int ftime_definitely_before(time_t now, time_t when);
- /* File helpers */
- ssize_t write_all(int fd, const char *buf, size_t count, int isSocket);
- ssize_t read_all(int fd, char *buf, size_t count, int isSocket);
- /** Return values from file_status(); see that function's documentation
- * for details. */
- typedef enum { FN_ERROR, FN_NOENT, FN_FILE, FN_DIR } file_status_t;
- file_status_t file_status(const char *filename);
- /** Possible behaviors for check_private_dir() on encountering a nonexistent
- * directory; see that function's documentation for details. */
- typedef enum { CPD_NONE, CPD_CREATE, CPD_CHECK } cpd_check_t;
- int check_private_dir(const char *dirname, cpd_check_t check);
- #define OPEN_FLAGS_REPLACE (O_WRONLY|O_CREAT|O_TRUNC)
- #define OPEN_FLAGS_APPEND (O_WRONLY|O_CREAT|O_APPEND)
- typedef struct open_file_t open_file_t;
- int start_writing_to_file(const char *fname, int open_flags, int mode,
- open_file_t **data_out);
- FILE *start_writing_to_stdio_file(const char *fname, int open_flags, int mode,
- open_file_t **data_out);
- FILE *fdopen_file(open_file_t *file_data);
- int finish_writing_to_file(open_file_t *file_data);
- int abort_writing_to_file(open_file_t *file_data);
- int write_str_to_file(const char *fname, const char *str, int bin);
- int write_bytes_to_file(const char *fname, const char *str, size_t len,
- int bin);
- /** An ad-hoc type to hold a string of characters and a count; used by
- * write_chunks_to_file. */
- typedef struct sized_chunk_t {
- const char *bytes;
- size_t len;
- } sized_chunk_t;
- int write_chunks_to_file(const char *fname, const struct smartlist_t *chunks,
- int bin);
- int append_bytes_to_file(const char *fname, const char *str, size_t len,
- int bin);
- /** Flag for read_file_to_str: open the file in binary mode. */
- #define RFTS_BIN 1
- /** Flag for read_file_to_str: it's okay if the file doesn't exist. */
- #define RFTS_IGNORE_MISSING 2
- struct stat;
- char *read_file_to_str(const char *filename, int flags, struct stat *stat_out)
- ATTR_MALLOC;
- const char *parse_config_line_from_str(const char *line,
- char **key_out, char **value_out);
- char *expand_filename(const char *filename);
- struct smartlist_t *tor_listdir(const char *dirname);
- int path_is_relative(const char *filename) ATTR_PURE;
- /* Process helpers */
- void start_daemon(void);
- void finish_daemon(const char *desired_cwd);
- void write_pidfile(char *filename);
- #endif