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MINOR: samples: add crc32c converter

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This patch adds the support of CRC32c (rfc4960).
This commit is contained in:
Emmanuel Hocdet 2018-03-21 11:19:01 +01:00 committed by Willy Tarreau
parent 4952985b71
commit 50791a7df3
2 changed files with 28 additions and 7 deletions
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24
doc/configuration.txt
View File

@ -12847,7 +12847,17 @@ crc32([<avalanche>])
found in Ethernet, Gzip, PNG, etc... It is slower than the other algorithms
but may provide a better or at least less predictable distribution. It must
not be used for security purposes as a 32-bit hash is trivial to break. See
also "djb2", "sdbm", "wt6" and the "hash-type" directive.
also "djb2", "sdbm", "wt6", "crc32c" and the "hash-type" directive.
crc32c([<avalanche>])
Hashes a binary input sample into an unsigned 32-bit quantity using the CRC32C
hash function. Optionally, it is possible to apply a full avalanche hash
function to the output if the optional <avalanche> argument equals 1. This
converter uses the same functions as described in RFC4960, Appendix B [8].
It is provided for compatibility with other software which want a CRC32C to be
computed on some input keys. It is slower than the other algorithms and it must
not be used for security purposes as a 32-bit hash is trivial to break. See
also "djb2", "sdbm", "wt6", "crc32" and the "hash-type" directive.
da-csv-conv(<prop>[,<prop>*])
Asks the DeviceAtlas converter to identify the User Agent string passed on
@ -12890,8 +12900,8 @@ djb2([<avalanche>])
balancing algorithms, so it will provide exactly the same results. It is
mostly intended for debugging, but can be used as a stick-table entry to
collect rough statistics. It must not be used for security purposes as a
32-bit hash is trivial to break. See also "crc32", "sdbm", "wt6" and the
"hash-type" directive.
32-bit hash is trivial to break. See also "crc32", "sdbm", "wt6", "crc32c",
and the "hash-type" directive.
even
Returns a boolean TRUE if the input value of type signed integer is even
@ -13199,8 +13209,8 @@ sdbm([<avalanche>])
balancing algorithms, so it will provide exactly the same results. It is
mostly intended for debugging, but can be used as a stick-table entry to
collect rough statistics. It must not be used for security purposes as a
32-bit hash is trivial to break. See also "crc32", "djb2", "wt6" and the
"hash-type" directive.
32-bit hash is trivial to break. See also "crc32", "djb2", "wt6", "crc32c",
and the "hash-type" directive.
set-var(<var name>)
Sets a variable with the input content and returns the content on the output
@ -13442,8 +13452,8 @@ wt6([<avalanche>])
balancing algorithms, so it will provide exactly the same results. It is
mostly intended for debugging, but can be used as a stick-table entry to
collect rough statistics. It must not be used for security purposes as a
32-bit hash is trivial to break. See also "crc32", "djb2", "sdbm", and the
"hash-type" directive.
32-bit hash is trivial to break. See also "crc32", "djb2", "sdbm", "crc32c",
and the "hash-type" directive.
xor(<value>)
Performs a bitwise "XOR" (exclusive OR) between <value> and the input value

11
src/sample.c
View File

@ -1743,6 +1743,16 @@ static int sample_conv_crc32(const struct arg *arg_p, struct sample *smp, void *
return 1;
}
/* hashes the binary input into crc32c (RFC4960, Appendix B [8].) */
static int sample_conv_crc32c(const struct arg *arg_p, struct sample *smp, void *private)
{
smp->data.u.sint = hash_crc32c(smp->data.u.str.str, smp->data.u.str.len);
if (arg_p && arg_p->data.sint)
smp->data.u.sint = full_hash(smp->data.u.sint);
smp->data.type = SMP_T_SINT;
return 1;
}
/* This function escape special json characters. The returned string can be
* safely set between two '"' and used as json string. The json string is
* defined like this:
@ -2910,6 +2920,7 @@ static struct sample_conv_kw_list sample_conv_kws = {ILH, {
{ "ltime", sample_conv_ltime, ARG2(1,STR,SINT), NULL, SMP_T_SINT, SMP_T_STR },
{ "utime", sample_conv_utime, ARG2(1,STR,SINT), NULL, SMP_T_SINT, SMP_T_STR },
{ "crc32", sample_conv_crc32, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "crc32c", sample_conv_crc32c, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "djb2", sample_conv_djb2, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "sdbm", sample_conv_sdbm, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },
{ "wt6", sample_conv_wt6, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },