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https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-27 22:03:31 +01:00
Move various mem* functions to lib/string
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@ -131,52 +131,6 @@ SecureZeroMemory(PVOID ptr, SIZE_T cnt)
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#include "lib/net/address.h"
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#include "lib/sandbox/sandbox.h"
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/** Given <b>hlen</b> bytes at <b>haystack</b> and <b>nlen</b> bytes at
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* <b>needle</b>, return a pointer to the first occurrence of the needle
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* within the haystack, or NULL if there is no such occurrence.
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*
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* This function is <em>not</em> timing-safe.
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*
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* Requires that <b>nlen</b> be greater than zero.
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*/
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const void *
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tor_memmem(const void *_haystack, size_t hlen,
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const void *_needle, size_t nlen)
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{
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#if defined(HAVE_MEMMEM) && (!defined(__GNUC__) || __GNUC__ >= 2)
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tor_assert(nlen);
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return memmem(_haystack, hlen, _needle, nlen);
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#else
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/* This isn't as fast as the GLIBC implementation, but it doesn't need to
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* be. */
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const char *p, *last_possible_start;
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const char *haystack = (const char*)_haystack;
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const char *needle = (const char*)_needle;
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char first;
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tor_assert(nlen);
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if (nlen > hlen)
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return NULL;
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p = haystack;
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/* Last position at which the needle could start. */
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last_possible_start = haystack + hlen - nlen;
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first = *(const char*)needle;
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while ((p = memchr(p, first, last_possible_start + 1 - p))) {
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if (fast_memeq(p, needle, nlen))
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return p;
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if (++p > last_possible_start) {
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/* This comparison shouldn't be necessary, since if p was previously
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* equal to last_possible_start, the next memchr call would be
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* "memchr(p, first, 0)", which will return NULL. But it clarifies the
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* logic. */
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return NULL;
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}
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}
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return NULL;
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#endif /* defined(HAVE_MEMMEM) && (!defined(__GNUC__) || __GNUC__ >= 2) */
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}
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/** Represents a lockfile on which we hold the lock. */
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struct tor_lockfile_t {
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/** Name of the file */
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@ -63,16 +63,6 @@
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#include <stdio.h>
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#include <errno.h>
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const void *tor_memmem(const void *haystack, size_t hlen, const void *needle,
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size_t nlen) ATTR_NONNULL((1,3));
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static const void *tor_memstr(const void *haystack, size_t hlen,
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const char *needle) ATTR_NONNULL((1,3));
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static inline const void *
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tor_memstr(const void *haystack, size_t hlen, const char *needle)
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{
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return tor_memmem(haystack, hlen, needle, strlen(needle));
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}
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/* ===== Time compatibility */
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struct tm *tor_localtime_r(const time_t *timep, struct tm *result);
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@ -240,54 +240,6 @@ hex_str(const char *from, size_t fromlen)
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return buf;
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}
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/** Compare the value of the string <b>prefix</b> with the start of the
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* <b>memlen</b>-byte memory chunk at <b>mem</b>. Return as for strcmp.
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*
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* [As fast_memcmp(mem, prefix, strlen(prefix)) but returns -1 if memlen is
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* less than strlen(prefix).]
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*/
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int
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fast_memcmpstart(const void *mem, size_t memlen,
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const char *prefix)
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{
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size_t plen = strlen(prefix);
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if (memlen < plen)
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return -1;
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return fast_memcmp(mem, prefix, plen);
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}
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/** Return true iff the 'len' bytes at 'mem' are all zero. */
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int
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tor_mem_is_zero(const char *mem, size_t len)
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{
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static const char ZERO[] = {
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0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
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};
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while (len >= sizeof(ZERO)) {
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/* It's safe to use fast_memcmp here, since the very worst thing an
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* attacker could learn is how many initial bytes of a secret were zero */
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if (fast_memcmp(mem, ZERO, sizeof(ZERO)))
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return 0;
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len -= sizeof(ZERO);
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mem += sizeof(ZERO);
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}
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/* Deal with leftover bytes. */
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if (len)
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return fast_memeq(mem, ZERO, len);
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return 1;
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}
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/** Return true iff the DIGEST_LEN bytes in digest are all zero. */
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int
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tor_digest_is_zero(const char *digest)
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{
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static const uint8_t ZERO_DIGEST[] = {
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0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0
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};
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return tor_memeq(digest, ZERO_DIGEST, DIGEST_LEN);
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}
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/** Return true if <b>string</b> is a valid 'key=[value]' string.
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* "value" is optional, to indicate the empty string. Log at logging
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* <b>severity</b> if something ugly happens. */
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@ -436,13 +388,6 @@ string_is_valid_nonrfc_hostname(const char *string)
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return result;
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}
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/** Return true iff the DIGEST256_LEN bytes in digest are all zero. */
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int
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tor_digest256_is_zero(const char *digest)
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{
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return tor_mem_is_zero(digest, DIGEST256_LEN);
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}
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/** Return a newly allocated string equal to <b>string</b>, except that every
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* character in <b>chars_to_escape</b> is preceded by a backslash. */
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char *
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@ -78,10 +78,6 @@ int string_is_valid_nonrfc_hostname(const char *string);
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int string_is_valid_ipv4_address(const char *string);
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int string_is_valid_ipv6_address(const char *string);
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int tor_mem_is_zero(const char *mem, size_t len);
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int tor_digest_is_zero(const char *digest);
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int tor_digest256_is_zero(const char *digest);
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char *tor_escape_str_for_pt_args(const char *string,
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const char *chars_to_escape);
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@ -1,5 +1,6 @@
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orconfig.h
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lib/cc/*.h
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lib/defs/*.h
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lib/err/*.h
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lib/malloc/*.h
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lib/ctime/*.h
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@ -7,10 +7,102 @@
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#include "lib/string/compat_ctype.h"
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#include "lib/err/torerr.h"
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#include "lib/ctime/di_ops.h"
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#include "lib/defs/digest_sizes.h"
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#include <string.h>
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#include <stdlib.h>
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/** Given <b>hlen</b> bytes at <b>haystack</b> and <b>nlen</b> bytes at
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* <b>needle</b>, return a pointer to the first occurrence of the needle
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* within the haystack, or NULL if there is no such occurrence.
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*
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* This function is <em>not</em> timing-safe.
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*
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* Requires that <b>nlen</b> be greater than zero.
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*/
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const void *
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tor_memmem(const void *_haystack, size_t hlen,
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const void *_needle, size_t nlen)
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{
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#if defined(HAVE_MEMMEM) && (!defined(__GNUC__) || __GNUC__ >= 2)
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raw_assert(nlen);
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return memmem(_haystack, hlen, _needle, nlen);
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#else
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/* This isn't as fast as the GLIBC implementation, but it doesn't need to
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* be. */
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const char *p, *last_possible_start;
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const char *haystack = (const char*)_haystack;
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const char *needle = (const char*)_needle;
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char first;
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raw_assert(nlen);
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if (nlen > hlen)
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return NULL;
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p = haystack;
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/* Last position at which the needle could start. */
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last_possible_start = haystack + hlen - nlen;
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first = *(const char*)needle;
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while ((p = memchr(p, first, last_possible_start + 1 - p))) {
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if (fast_memeq(p, needle, nlen))
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return p;
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if (++p > last_possible_start) {
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/* This comparison shouldn't be necessary, since if p was previously
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* equal to last_possible_start, the next memchr call would be
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* "memchr(p, first, 0)", which will return NULL. But it clarifies the
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* logic. */
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return NULL;
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}
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}
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return NULL;
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#endif /* defined(HAVE_MEMMEM) && (!defined(__GNUC__) || __GNUC__ >= 2) */
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}
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const void *
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tor_memstr(const void *haystack, size_t hlen, const char *needle)
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{
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return tor_memmem(haystack, hlen, needle, strlen(needle));
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}
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/** Return true iff the 'len' bytes at 'mem' are all zero. */
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int
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tor_mem_is_zero(const char *mem, size_t len)
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{
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static const char ZERO[] = {
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0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
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};
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while (len >= sizeof(ZERO)) {
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/* It's safe to use fast_memcmp here, since the very worst thing an
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* attacker could learn is how many initial bytes of a secret were zero */
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if (fast_memcmp(mem, ZERO, sizeof(ZERO)))
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return 0;
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len -= sizeof(ZERO);
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mem += sizeof(ZERO);
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}
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/* Deal with leftover bytes. */
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if (len)
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return fast_memeq(mem, ZERO, len);
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return 1;
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}
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/** Return true iff the DIGEST_LEN bytes in digest are all zero. */
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int
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tor_digest_is_zero(const char *digest)
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{
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static const uint8_t ZERO_DIGEST[] = {
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0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0
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};
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return tor_memeq(digest, ZERO_DIGEST, DIGEST_LEN);
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}
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/** Return true iff the DIGEST256_LEN bytes in digest are all zero. */
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int
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tor_digest256_is_zero(const char *digest)
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{
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return tor_mem_is_zero(digest, DIGEST256_LEN);
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}
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/** Remove from the string <b>s</b> every character which appears in
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* <b>strip</b>. */
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void
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@ -140,6 +232,22 @@ strcasecmpstart(const char *s1, const char *s2)
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return strncasecmp(s1, s2, n);
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}
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/** Compare the value of the string <b>prefix</b> with the start of the
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* <b>memlen</b>-byte memory chunk at <b>mem</b>. Return as for strcmp.
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*
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* [As fast_memcmp(mem, prefix, strlen(prefix)) but returns -1 if memlen is
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* less than strlen(prefix).]
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*/
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int
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fast_memcmpstart(const void *mem, size_t memlen,
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const char *prefix)
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{
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size_t plen = strlen(prefix);
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if (memlen < plen)
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return -1;
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return fast_memcmp(mem, prefix, plen);
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}
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/** Compares the last strlen(s2) characters of s1 with s2. Returns as for
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* strcmp.
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*/
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@ -11,6 +11,14 @@
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#include <stddef.h>
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const void *tor_memmem(const void *haystack, size_t hlen, const void *needle,
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size_t nlen) ATTR_NONNULL((1,3));
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const void *tor_memstr(const void *haystack, size_t hlen,
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const char *needle) ATTR_NONNULL((1,3));
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int tor_mem_is_zero(const char *mem, size_t len);
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int tor_digest_is_zero(const char *digest);
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int tor_digest256_is_zero(const char *digest);
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/** Allowable characters in a hexadecimal string. */
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#define HEX_CHARACTERS "0123456789ABCDEFabcdef"
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void tor_strlower(char *s) ATTR_NONNULL((1));
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