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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 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 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 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>*]) da-csv-conv(<prop>[,<prop>*])
Asks the DeviceAtlas converter to identify the User Agent string passed on 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 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 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 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 32-bit hash is trivial to break. See also "crc32", "sdbm", "wt6", "crc32c",
"hash-type" directive. and the "hash-type" directive.
even even
Returns a boolean TRUE if the input value of type signed integer is 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 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 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 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 32-bit hash is trivial to break. See also "crc32", "djb2", "wt6", "crc32c",
"hash-type" directive. and the "hash-type" directive.
set-var(<var name>) set-var(<var name>)
Sets a variable with the input content and returns the content on the output 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 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 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 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 32-bit hash is trivial to break. See also "crc32", "djb2", "sdbm", "crc32c",
"hash-type" directive. and the "hash-type" directive.
xor(<value>) xor(<value>)
Performs a bitwise "XOR" (exclusive OR) between <value> and the input 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; 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 /* This function escape special json characters. The returned string can be
* safely set between two '"' and used as json string. The json string is * safely set between two '"' and used as json string. The json string is
* defined like this: * 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 }, { "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 }, { "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 }, { "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 }, { "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 }, { "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 }, { "wt6", sample_conv_wt6, ARG1(0,SINT), NULL, SMP_T_BIN, SMP_T_SINT },