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haproxy/src/http_conv.c

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/*
* HTTP sample conversion
*
* Copyright 2000-2018 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/capture-t.h>
#include <haproxy/chunk.h>
#include <haproxy/http.h>
#include <haproxy/pool.h>
#include <haproxy/sample.h>
#include <haproxy/stream.h>
#include <haproxy/tools.h>
#include <haproxy/version.h>
static int smp_check_http_date_unit(struct arg *args, struct sample_conv *conv,
const char *file, int line, char **err)
{
return smp_check_date_unit(args, err);
}
/* takes an UINT value on input supposed to represent the time since EPOCH,
* adds an optional offset found in args[0] and emits a string representing
* the date in RFC-1123/5322 format. If optional unit param in args[1] is
* provided, decode timestamp in milliseconds ("ms") or microseconds("us"),
* and use relevant output date format.
*/
static int sample_conv_http_date(const struct arg *args, struct sample *smp, void *private)
{
const char day[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
const char mon[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
struct buffer *temp;
struct tm tm;
int sec_frac = 0;
time_t curr_date;
/* add offset */
if (args[0].type == ARGT_SINT)
smp->data.u.sint += args[0].data.sint;
/* report in milliseconds */
if (args[1].type == ARGT_SINT && args[1].data.sint == TIME_UNIT_MS) {
sec_frac = smp->data.u.sint % 1000;
smp->data.u.sint /= 1000;
}
/* report in microseconds */
else if (args[1].type == ARGT_SINT && args[1].data.sint == TIME_UNIT_US) {
sec_frac = smp->data.u.sint % 1000000;
smp->data.u.sint /= 1000000;
}
/* With high numbers, the date returned can be negative, the 55 bits mask prevent this. */
curr_date = smp->data.u.sint & 0x007fffffffffffffLL;
get_gmtime(curr_date, &tm);
temp = get_trash_chunk();
if (args[1].type == ARGT_SINT && args[1].data.sint != TIME_UNIT_S) {
temp->data = snprintf(temp->area, temp->size - temp->data,
"%s, %02d %s %04d %02d:%02d:%02d.%d GMT",
day[tm.tm_wday], tm.tm_mday, mon[tm.tm_mon],
1900+tm.tm_year,
tm.tm_hour, tm.tm_min, tm.tm_sec, sec_frac);
} else {
temp->data = snprintf(temp->area, temp->size - temp->data,
"%s, %02d %s %04d %02d:%02d:%02d GMT",
day[tm.tm_wday], tm.tm_mday, mon[tm.tm_mon],
1900+tm.tm_year,
tm.tm_hour, tm.tm_min, tm.tm_sec);
}
smp->data.u.str = *temp;
smp->data.type = SMP_T_STR;
return 1;
}
/* Arguments: The list of expected value, the number of parts returned and the separator */
static int sample_conv_q_preferred(const struct arg *args, struct sample *smp, void *private)
{
const char *al = smp->data.u.str.area;
const char *end = al + smp->data.u.str.data;
const char *token;
int toklen;
int qvalue;
const char *str;
const char *w;
int best_q = 0;
/* Set the constant to the sample, because the output of the
* function will be peek in the constant configuration string.
*/
smp->flags |= SMP_F_CONST;
smp->data.u.str.size = 0;
smp->data.u.str.area = "";
smp->data.u.str.data = 0;
/* Parse the accept language */
while (1) {
/* Jump spaces, quit if the end is detected. */
while (al < end && isspace((unsigned char)*al))
al++;
if (al >= end)
break;
/* Start of the first word. */
token = al;
/* Look for separator: isspace(), ',' or ';'. Next value if 0 length word. */
while (al < end && *al != ';' && *al != ',' && !isspace((unsigned char)*al))
al++;
if (al == token)
goto expect_comma;
/* Length of the token. */
toklen = al - token;
qvalue = 1000;
/* Check if the token exists in the list. If the token not exists,
* jump to the next token.
*/
str = args[0].data.str.area;
w = str;
while (1) {
if (*str == ';' || *str == '\0') {
if (http_language_range_match(token, toklen, w, str - w))
goto look_for_q;
if (*str == '\0')
goto expect_comma;
w = str + 1;
}
str++;
}
goto expect_comma;
look_for_q:
/* Jump spaces, quit if the end is detected. */
while (al < end && isspace((unsigned char)*al))
al++;
if (al >= end)
goto process_value;
/* If ',' is found, process the result */
if (*al == ',')
goto process_value;
/* If the character is different from ';', look
* for the end of the header part in best effort.
*/
if (*al != ';')
goto expect_comma;
/* Assumes that the char is ';', now expect "q=". */
al++;
/* Jump spaces, process value if the end is detected. */
while (al < end && isspace((unsigned char)*al))
al++;
if (al >= end)
goto process_value;
/* Expect 'q'. If no 'q', continue in best effort */
if (*al != 'q')
goto process_value;
al++;
/* Jump spaces, process value if the end is detected. */
while (al < end && isspace((unsigned char)*al))
al++;
if (al >= end)
goto process_value;
/* Expect '='. If no '=', continue in best effort */
if (*al != '=')
goto process_value;
al++;
/* Jump spaces, process value if the end is detected. */
while (al < end && isspace((unsigned char)*al))
al++;
if (al >= end)
goto process_value;
/* Parse the q value. */
qvalue = http_parse_qvalue(al, &al);
process_value:
/* If the new q value is the best q value, then store the associated
* language in the response. If qvalue is the biggest value (1000),
* break the process.
*/
if (qvalue > best_q) {
smp->data.u.str.area = (char *)w;
smp->data.u.str.data = str - w;
if (qvalue >= 1000)
break;
best_q = qvalue;
}
expect_comma:
/* Expect comma or end. If the end is detected, quit the loop. */
while (al < end && *al != ',')
al++;
if (al >= end)
break;
/* Comma is found, jump it and restart the analyzer. */
al++;
}
/* Set default value if required. */
if (smp->data.u.str.data == 0 && args[1].type == ARGT_STR) {
smp->data.u.str.area = args[1].data.str.area;
smp->data.u.str.data = args[1].data.str.data;
}
/* Return true only if a matching language was found. */
return smp->data.u.str.data != 0;
}
/* This fetch url-decode any input string. */
static int sample_conv_url_dec(const struct arg *args, struct sample *smp, void *private)
{
int in_form = 0;
int len;
/* If the constant flag is set or if not size is available at
* the end of the buffer, copy the string in other buffer
* before decoding.
*/
if (smp->flags & SMP_F_CONST || smp->data.u.str.size <= smp->data.u.str.data) {
struct buffer *str = get_trash_chunk();
memcpy(str->area, smp->data.u.str.area, smp->data.u.str.data);
smp->data.u.str.area = str->area;
smp->data.u.str.size = str->size;
smp->flags &= ~SMP_F_CONST;
}
/* Add final \0 required by url_decode(), and convert the input string. */
smp->data.u.str.area[smp->data.u.str.data] = '\0';
if (args[0].type == ARGT_SINT)
in_form = !!args[0].data.sint;
len = url_decode(smp->data.u.str.area, in_form);
if (len < 0)
return 0;
smp->data.u.str.data = len;
return 1;
}
/* url-encode types and encode maps */
enum encode_type {
ENC_QUERY = 0,
};
long query_encode_map[(256 / 8) / sizeof(long)];
/* Check url-encode type */
static int sample_conv_url_enc_check(struct arg *arg, struct sample_conv *conv,
const char *file, int line, char **err)
{
enum encode_type enc_type;
if (strcmp(arg->data.str.area, "") == 0)
enc_type = ENC_QUERY;
else if (strcmp(arg->data.str.area, "query") == 0)
enc_type = ENC_QUERY;
else {
memprintf(err, "Unexpected encode type. "
"Allowed value is 'query'");
return 0;
}
chunk_destroy(&arg->data.str);
arg->type = ARGT_SINT;
arg->data.sint = enc_type;
return 1;
}
/* Initializes some url encode data at boot */
static void sample_conf_url_enc_init()
{
int i;
memset(query_encode_map, 0, sizeof(query_encode_map));
/* use rfc3986 to determine list of characters to keep unchanged for
* query string */
for (i = 0; i < 256; i++) {
if (!((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z')
|| (i >= '0' && i <= '9') ||
i == '-' || i == '.' || i == '_' || i == '~'))
ha_bit_set(i, query_encode_map);
}
}
INITCALL0(STG_PREPARE, sample_conf_url_enc_init);
/* This fetch url-encode any input string. Only support query string for now */
static int sample_conv_url_enc(const struct arg *args, struct sample *smp, void
*private)
{
enum encode_type enc_type;
struct buffer *trash = get_trash_chunk();
long *encode_map;
char *ret;
enc_type = ENC_QUERY;
enc_type = args->data.sint;
if (enc_type == ENC_QUERY)
encode_map = query_encode_map;
else
return 0;
ret = encode_chunk(trash->area, trash->area + trash->size, '%',
encode_map, &smp->data.u.str);
if (ret == NULL || *ret != '\0')
return 0;
trash->data = ret - trash->area;
smp->data.u.str = *trash;
return 1;
}
static int smp_conv_req_capture(const struct arg *args, struct sample *smp, void *private)
{
struct proxy *fe;
int idx, i;
struct cap_hdr *hdr;
int len;
if (args->type != ARGT_SINT)
return 0;
if (!smp->strm)
return 0;
fe = strm_fe(smp->strm);
idx = args->data.sint;
/* Check the availability of the capture id. */
if (idx > fe->nb_req_cap - 1)
return 0;
/* Look for the original configuration. */
for (hdr = fe->req_cap, i = fe->nb_req_cap - 1;
hdr != NULL && i != idx ;
i--, hdr = hdr->next);
if (!hdr)
return 0;
/* check for the memory allocation */
if (smp->strm->req_cap[hdr->index] == NULL)
smp->strm->req_cap[hdr->index] = pool_alloc(hdr->pool);
if (smp->strm->req_cap[hdr->index] == NULL)
return 0;
/* Check length. */
len = smp->data.u.str.data;
if (len > hdr->len)
len = hdr->len;
/* Capture input data. */
memcpy(smp->strm->req_cap[idx], smp->data.u.str.area, len);
smp->strm->req_cap[idx][len] = '\0';
return 1;
}
static int smp_conv_res_capture(const struct arg *args, struct sample *smp, void *private)
{
struct proxy *fe;
int idx, i;
struct cap_hdr *hdr;
int len;
if (args->type != ARGT_SINT)
return 0;
if (!smp->strm)
return 0;
fe = strm_fe(smp->strm);
idx = args->data.sint;
/* Check the availability of the capture id. */
if (idx > fe->nb_rsp_cap - 1)
return 0;
/* Look for the original configuration. */
for (hdr = fe->rsp_cap, i = fe->nb_rsp_cap - 1;
hdr != NULL && i != idx ;
i--, hdr = hdr->next);
if (!hdr)
return 0;
/* check for the memory allocation */
if (smp->strm->res_cap[hdr->index] == NULL)
smp->strm->res_cap[hdr->index] = pool_alloc(hdr->pool);
if (smp->strm->res_cap[hdr->index] == NULL)
return 0;
/* Check length. */
len = smp->data.u.str.data;
if (len > hdr->len)
len = hdr->len;
/* Capture input data. */
memcpy(smp->strm->res_cap[idx], smp->data.u.str.area, len);
smp->strm->res_cap[idx][len] = '\0';
return 1;
}
/************************************************************************/
/* All supported converter keywords must be declared here. */
/************************************************************************/
/* Note: must not be declared <const> as its list will be overwritten */
static struct sample_conv_kw_list sample_conv_kws = {ILH, {
{ "http_date", sample_conv_http_date, ARG2(0,SINT,STR), smp_check_http_date_unit, SMP_T_SINT, SMP_T_STR},
{ "language", sample_conv_q_preferred, ARG2(1,STR,STR), NULL, SMP_T_STR, SMP_T_STR},
{ "capture-req", smp_conv_req_capture, ARG1(1,SINT), NULL, SMP_T_STR, SMP_T_STR},
{ "capture-res", smp_conv_res_capture, ARG1(1,SINT), NULL, SMP_T_STR, SMP_T_STR},
{ "url_dec", sample_conv_url_dec, ARG1(0,SINT), NULL, SMP_T_STR, SMP_T_STR},
{ "url_enc", sample_conv_url_enc, ARG1(1,STR), sample_conv_url_enc_check, SMP_T_STR, SMP_T_STR},
{ NULL, NULL, 0, 0, 0 },
}};
INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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