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haproxy/src/sample.c
Willy Tarreau 6bcb0a84e7 BUG/MAJOR: tcp: fix a possible busy spinning loop in content track-sc* 
As a consequence of various recent changes on the sample conversion,
a corner case has emerged where it is possible to wait forever for a
sample in track-sc*.

The issue is caused by the fact that functions relying on sample_process()
don't all exactly work the same regarding the SMP_F_MAY_CHANGE flag and
the output result. Here it was possible to wait forever for an output
sample from stktable_fetch_key() without checking the SMP_OPT_FINAL flag.
As a result, if the client connects and closes without sending the data
and haproxy expects a sample which is capable of coming, it will ignore
this impossible case and will continue to wait.

This change adds control for SMP_OPT_FINAL before waiting for extra data.
The various relevant functions have been better documented regarding their
output values.

This fix must be backported to 1.5 since it appeared there.
2014-07-30 08:56:35 +02:00

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/*
* Sample management functions.
*
* Copyright 2009-2010 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
* Copyright (C) 2012 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 <string.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <types/global.h>
#include <common/chunk.h>
#include <common/hash.h>
#include <common/standard.h>
#include <common/uri_auth.h>
#include <common/base64.h>
#include <proto/arg.h>
#include <proto/auth.h>
#include <proto/log.h>
#include <proto/proto_http.h>
#include <proto/proxy.h>
#include <proto/sample.h>
#include <proto/stick_table.h>
/* sample type names */
const char *smp_to_type[SMP_TYPES] = {
[SMP_T_BOOL] = "bool",
[SMP_T_UINT] = "uint",
[SMP_T_SINT] = "sint",
[SMP_T_ADDR] = "addr",
[SMP_T_IPV4] = "ipv4",
[SMP_T_IPV6] = "ipv6",
[SMP_T_STR] = "str",
[SMP_T_BIN] = "bin",
};
/* static sample used in sample_process() when <p> is NULL */
static struct sample temp_smp;
/* list head of all known sample fetch keywords */
static struct sample_fetch_kw_list sample_fetches = {
.list = LIST_HEAD_INIT(sample_fetches.list)
};
/* list head of all known sample format conversion keywords */
static struct sample_conv_kw_list sample_convs = {
.list = LIST_HEAD_INIT(sample_convs.list)
};
const unsigned int fetch_cap[SMP_SRC_ENTRIES] = {
[SMP_SRC_INTRN] = (SMP_VAL_FE_CON_ACC | SMP_VAL_FE_SES_ACC | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_LISTN] = (SMP_VAL_FE_CON_ACC | SMP_VAL_FE_SES_ACC | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_FTEND] = (SMP_VAL_FE_CON_ACC | SMP_VAL_FE_SES_ACC | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_L4CLI] = (SMP_VAL_FE_CON_ACC | SMP_VAL_FE_SES_ACC | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_L5CLI] = (SMP_VAL___________ | SMP_VAL_FE_SES_ACC | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_TRACK] = (SMP_VAL_FE_CON_ACC | SMP_VAL_FE_SES_ACC | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_L6REQ] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________),
[SMP_SRC_HRQHV] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________),
[SMP_SRC_HRQHP] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_FE_REQ_CNT |
SMP_VAL_FE_HRQ_HDR | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_HRQBO] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL_FE_HRQ_BDY | SMP_VAL_FE_SET_BCK |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________),
[SMP_SRC_BKEND] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL_BE_REQ_CNT | SMP_VAL_BE_HRQ_HDR | SMP_VAL_BE_HRQ_BDY |
SMP_VAL_BE_SET_SRV | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_SERVR] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL_BE_SRV_CON | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_L4SRV] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_L5SRV] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_L6RES] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL___________),
[SMP_SRC_HRSHV] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL___________),
[SMP_SRC_HRSHP] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL_BE_RES_CNT |
SMP_VAL_BE_HRS_HDR | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL_FE_LOG_END),
[SMP_SRC_HRSBO] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL_BE_HRS_BDY | SMP_VAL_BE_STO_RUL |
SMP_VAL_FE_RES_CNT | SMP_VAL_FE_HRS_HDR | SMP_VAL_FE_HRS_BDY |
SMP_VAL___________),
[SMP_SRC_RQFIN] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL_FE_LOG_END),
[SMP_SRC_RSFIN] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL_FE_LOG_END),
[SMP_SRC_TXFIN] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL_FE_LOG_END),
[SMP_SRC_SSFIN] = (SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL___________ | SMP_VAL___________ | SMP_VAL___________ |
SMP_VAL_FE_LOG_END),
};
static const char *fetch_src_names[SMP_SRC_ENTRIES] = {
[SMP_SRC_INTRN] = "internal state",
[SMP_SRC_LISTN] = "listener",
[SMP_SRC_FTEND] = "frontend",
[SMP_SRC_L4CLI] = "client address",
[SMP_SRC_L5CLI] = "client-side connection",
[SMP_SRC_TRACK] = "track counters",
[SMP_SRC_L6REQ] = "request buffer",
[SMP_SRC_HRQHV] = "HTTP request headers",
[SMP_SRC_HRQHP] = "HTTP request",
[SMP_SRC_HRQBO] = "HTTP request body",
[SMP_SRC_BKEND] = "backend",
[SMP_SRC_SERVR] = "server",
[SMP_SRC_L4SRV] = "server address",
[SMP_SRC_L5SRV] = "server-side connection",
[SMP_SRC_L6RES] = "response buffer",
[SMP_SRC_HRSHV] = "HTTP response headers",
[SMP_SRC_HRSHP] = "HTTP response",
[SMP_SRC_HRSBO] = "HTTP response body",
[SMP_SRC_RQFIN] = "request buffer statistics",
[SMP_SRC_RSFIN] = "response buffer statistics",
[SMP_SRC_TXFIN] = "transaction statistics",
[SMP_SRC_SSFIN] = "session statistics",
};
static const char *fetch_ckp_names[SMP_CKP_ENTRIES] = {
[SMP_CKP_FE_CON_ACC] = "frontend tcp-request connection rule",
[SMP_CKP_FE_SES_ACC] = "frontend tcp-request session rule",
[SMP_CKP_FE_REQ_CNT] = "frontend tcp-request content rule",
[SMP_CKP_FE_HRQ_HDR] = "frontend http-request header rule",
[SMP_CKP_FE_HRQ_BDY] = "frontend http-request body rule",
[SMP_CKP_FE_SET_BCK] = "frontend use-backend rule",
[SMP_CKP_BE_REQ_CNT] = "backend tcp-request content rule",
[SMP_CKP_BE_HRQ_HDR] = "backend http-request header rule",
[SMP_CKP_BE_HRQ_BDY] = "backend http-request body rule",
[SMP_CKP_BE_SET_SRV] = "backend use-server, balance or stick-match rule",
[SMP_CKP_BE_SRV_CON] = "server source selection",
[SMP_CKP_BE_RES_CNT] = "backend tcp-response content rule",
[SMP_CKP_BE_HRS_HDR] = "backend http-response header rule",
[SMP_CKP_BE_HRS_BDY] = "backend http-response body rule",
[SMP_CKP_BE_STO_RUL] = "backend stick-store rule",
[SMP_CKP_FE_RES_CNT] = "frontend tcp-response content rule",
[SMP_CKP_FE_HRS_HDR] = "frontend http-response header rule",
[SMP_CKP_FE_HRS_BDY] = "frontend http-response body rule",
[SMP_CKP_FE_LOG_END] = "logs",
};
/* This function returns the type of the data returned by the sample_expr.
* It assumes that the <expr> and all of its converters are properly
* initialized.
*/
inline
int smp_expr_output_type(struct sample_expr *expr)
{
struct sample_conv_expr *smp_expr;
if (!LIST_ISEMPTY(&expr->conv_exprs)) {
smp_expr = LIST_PREV(&expr->conv_exprs, struct sample_conv_expr *, list);
return smp_expr->conv->out_type;
}
return expr->fetch->out_type;
}
/* fill the trash with a comma-delimited list of source names for the <use> bit
* field which must be composed of a non-null set of SMP_USE_* flags. The return
* value is the pointer to the string in the trash buffer.
*/
const char *sample_src_names(unsigned int use)
{
int bit;
trash.len = 0;
trash.str[0] = '\0';
for (bit = 0; bit < SMP_SRC_ENTRIES; bit++) {
if (!(use & ~((1 << bit) - 1)))
break; /* no more bits */
if (!(use & (1 << bit)))
continue; /* bit not set */
trash.len += snprintf(trash.str + trash.len, trash.size - trash.len, "%s%s",
(use & ((1 << bit) - 1)) ? "," : "",
fetch_src_names[bit]);
}
return trash.str;
}
/* return a pointer to the correct sample checkpoint name, or "unknown" when
* the flags are invalid. Only the lowest bit is used, higher bits are ignored
* if set.
*/
const char *sample_ckp_names(unsigned int use)
{
int bit;
for (bit = 0; bit < SMP_CKP_ENTRIES; bit++)
if (use & (1 << bit))
return fetch_ckp_names[bit];
return "unknown sample check place, please report this bug";
}
/*
* Registers the sample fetch keyword list <kwl> as a list of valid keywords
* for next parsing sessions. The fetch keywords capabilities are also computed
* from their ->use field.
*/
void sample_register_fetches(struct sample_fetch_kw_list *kwl)
{
struct sample_fetch *sf;
int bit;
for (sf = kwl->kw; sf->kw != NULL; sf++) {
for (bit = 0; bit < SMP_SRC_ENTRIES; bit++)
if (sf->use & (1 << bit))
sf->val |= fetch_cap[bit];
}
LIST_ADDQ(&sample_fetches.list, &kwl->list);
}
/*
* Registers the sample format coverstion keyword list <pckl> as a list of valid keywords for next
* parsing sessions.
*/
void sample_register_convs(struct sample_conv_kw_list *pckl)
{
LIST_ADDQ(&sample_convs.list, &pckl->list);
}
/*
* Returns the pointer on sample fetch keyword structure identified by
* string of <len> in buffer <kw>.
*
*/
struct sample_fetch *find_sample_fetch(const char *kw, int len)
{
int index;
struct sample_fetch_kw_list *kwl;
list_for_each_entry(kwl, &sample_fetches.list, list) {
for (index = 0; kwl->kw[index].kw != NULL; index++) {
if (strncmp(kwl->kw[index].kw, kw, len) == 0 &&
kwl->kw[index].kw[len] == '\0')
return &kwl->kw[index];
}
}
return NULL;
}
/*
* Returns the pointer on sample format conversion keyword structure identified by
* string of <len> in buffer <kw>.
*
*/
struct sample_conv *find_sample_conv(const char *kw, int len)
{
int index;
struct sample_conv_kw_list *kwl;
list_for_each_entry(kwl, &sample_convs.list, list) {
for (index = 0; kwl->kw[index].kw != NULL; index++) {
if (strncmp(kwl->kw[index].kw, kw, len) == 0 &&
kwl->kw[index].kw[len] == '\0')
return &kwl->kw[index];
}
}
return NULL;
}
/******************************************************************/
/* Sample casts functions */
/* Note: these functions do *NOT* set the output type on the */
/* sample, the caller is responsible for doing this on return. */
/******************************************************************/
static int c_ip2int(struct sample *smp)
{
smp->data.uint = ntohl(smp->data.ipv4.s_addr);
smp->type = SMP_T_UINT;
return 1;
}
static int c_ip2str(struct sample *smp)
{
struct chunk *trash = get_trash_chunk();
if (!inet_ntop(AF_INET, (void *)&smp->data.ipv4, trash->str, trash->size))
return 0;
trash->len = strlen(trash->str);
smp->data.str = *trash;
smp->type = SMP_T_STR;
smp->flags &= ~SMP_F_CONST;
return 1;
}
static int c_ip2ipv6(struct sample *smp)
{
v4tov6(&smp->data.ipv6, &smp->data.ipv4);
smp->type = SMP_T_IPV6;
return 1;
}
static int c_ipv62str(struct sample *smp)
{
struct chunk *trash = get_trash_chunk();
if (!inet_ntop(AF_INET6, (void *)&smp->data.ipv6, trash->str, trash->size))
return 0;
trash->len = strlen(trash->str);
smp->data.str = *trash;
smp->type = SMP_T_STR;
smp->flags &= ~SMP_F_CONST;
return 1;
}
/*
static int c_ipv62ip(struct sample *smp)
{
return v6tov4(&smp->data.ipv4, &smp->data.ipv6);
}
*/
static int c_int2ip(struct sample *smp)
{
smp->data.ipv4.s_addr = htonl(smp->data.uint);
smp->type = SMP_T_IPV4;
return 1;
}
static int c_str2addr(struct sample *smp)
{
if (!buf2ip(smp->data.str.str, smp->data.str.len, &smp->data.ipv4)) {
if (!buf2ip6(smp->data.str.str, smp->data.str.len, &smp->data.ipv6))
return 0;
smp->type = SMP_T_IPV6;
smp->flags &= ~SMP_F_CONST;
return 1;
}
smp->type = SMP_T_IPV4;
smp->flags &= ~SMP_F_CONST;
return 1;
}
static int c_str2ip(struct sample *smp)
{
if (!buf2ip(smp->data.str.str, smp->data.str.len, &smp->data.ipv4))
return 0;
smp->type = SMP_T_IPV4;
smp->flags &= ~SMP_F_CONST;
return 1;
}
static int c_str2ipv6(struct sample *smp)
{
if (!buf2ip6(smp->data.str.str, smp->data.str.len, &smp->data.ipv6))
return 0;
smp->type = SMP_T_IPV6;
smp->flags &= ~SMP_F_CONST;
return 1;
}
/* The sample is always copied into a new one so that smp->size is always
* valid. The NULL char always enforces the end of string if it is met.
*/
static int c_bin2str(struct sample *smp)
{
struct chunk *trash = get_trash_chunk();
unsigned char c;
int ptr = 0;
while (ptr < smp->data.str.len) {
c = smp->data.str.str[ptr];
if (!c)
break;
trash->str[ptr] = c;
ptr++;
}
trash->len = ptr;
trash->str[ptr] = 0;
smp->data.str = *trash;
smp->type = SMP_T_STR;
smp->flags &= ~SMP_F_CONST;
return 1;
}
static int c_int2str(struct sample *smp)
{
struct chunk *trash = get_trash_chunk();
char *pos;
pos = ultoa_r(smp->data.uint, trash->str, trash->size);
if (!pos)
return 0;
trash->size = trash->size - (pos - trash->str);
trash->str = pos;
trash->len = strlen(pos);
smp->data.str = *trash;
smp->type = SMP_T_STR;
smp->flags &= ~SMP_F_CONST;
return 1;
}
/* This function duplicates data and removes the flag "const". */
int smp_dup(struct sample *smp)
{
struct chunk *trash;
/* If the const flag is not set, we don't need to duplicate the
* pattern as it can be modified in place.
*/
if (!(smp->flags & SMP_F_CONST))
return 1;
switch (smp->type) {
case SMP_T_BOOL:
case SMP_T_UINT:
case SMP_T_SINT:
case SMP_T_ADDR:
case SMP_T_IPV4:
case SMP_T_IPV6:
/* These type are not const. */
break;
case SMP_T_STR:
case SMP_T_BIN:
/* Duplicate data. */
trash = get_trash_chunk();
trash->len = smp->data.str.len < trash->size ? smp->data.str.len : trash->size;
memcpy(trash->str, smp->data.str.str, trash->len);
smp->data.str = *trash;
break;
default:
/* Other cases are unexpected. */
return 0;
}
/* remove const flag */
smp->flags &= ~SMP_F_CONST;
return 1;
}
int c_none(struct sample *smp)
{
return 1;
}
static int c_str2int(struct sample *smp)
{
int i;
uint32_t ret = 0;
if (smp->data.str.len == 0)
return 0;
for (i = 0; i < smp->data.str.len; i++) {
uint32_t val = smp->data.str.str[i] - '0';
if (val > 9) {
if (i == 0)
return 0;
break;
}
ret = ret * 10 + val;
}
smp->data.uint = ret;
smp->type = SMP_T_UINT;
smp->flags &= ~SMP_F_CONST;
return 1;
}
static int c_str2meth(struct sample *smp)
{
enum http_meth_t meth;
int len;
meth = find_http_meth(smp->data.str.str, smp->data.str.len);
if (meth == HTTP_METH_OTHER) {
len = smp->data.str.len;
smp->data.meth.str.str = smp->data.str.str;
smp->data.meth.str.len = len;
}
else
smp->flags &= ~SMP_F_CONST;
smp->data.meth.meth = meth;
smp->type = SMP_T_METH;
return 1;
}
static int c_meth2str(struct sample *smp)
{
int len;
enum http_meth_t meth;
if (smp->data.meth.meth == HTTP_METH_OTHER) {
/* The method is unknown. Copy the original pointer. */
len = smp->data.meth.str.len;
smp->data.str.str = smp->data.meth.str.str;
smp->data.str.len = len;
smp->type = SMP_T_STR;
}
else if (smp->data.meth.meth < HTTP_METH_OTHER) {
/* The method is known, copy the pointer containing the string. */
meth = smp->data.meth.meth;
smp->data.str.str = http_known_methods[meth].name;
smp->data.str.len = http_known_methods[meth].len;
smp->flags |= SMP_F_CONST;
smp->type = SMP_T_STR;
}
else {
/* Unknown method */
return 0;
}
return 1;
}
static int c_addr2bin(struct sample *smp)
{
struct chunk *chk = get_trash_chunk();
if (smp->type == SMP_T_IPV4) {
chk->len = 4;
memcpy(chk->str, &smp->data.ipv4, chk->len);
}
else if (smp->type == SMP_T_IPV6) {
chk->len = 16;
memcpy(chk->str, &smp->data.ipv6, chk->len);
}
else
return 0;
smp->data.str = *chk;
smp->type = SMP_T_BIN;
return 1;
}
static int c_int2bin(struct sample *smp)
{
struct chunk *chk = get_trash_chunk();
*(unsigned int *)chk->str = htonl(smp->data.uint);
chk->len = 4;
smp->data.str = *chk;
smp->type = SMP_T_BIN;
return 1;
}
/*****************************************************************/
/* Sample casts matrix: */
/* sample_casts[from type][to type] */
/* NULL pointer used for impossible sample casts */
/*****************************************************************/
sample_cast_fct sample_casts[SMP_TYPES][SMP_TYPES] = {
/* to: BOOL UINT SINT ADDR IPV4 IPV6 STR BIN METH */
/* from: BOOL */ { c_none, c_none, c_none, NULL, NULL, NULL, c_int2str, NULL, NULL, },
/* UINT */ { c_none, c_none, c_none, c_int2ip, c_int2ip, NULL, c_int2str, c_int2bin, NULL, },
/* SINT */ { c_none, c_none, c_none, c_int2ip, c_int2ip, NULL, c_int2str, c_int2bin, NULL, },
/* ADDR */ { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, },
/* IPV4 */ { NULL, c_ip2int, c_ip2int, c_none, c_none, c_ip2ipv6, c_ip2str, c_addr2bin, NULL, },
/* IPV6 */ { NULL, NULL, NULL, c_none, NULL, c_none, c_ipv62str, c_addr2bin, NULL, },
/* STR */ { c_str2int, c_str2int, c_str2int, c_str2addr, c_str2ip, c_str2ipv6, c_none, c_none, c_str2meth, },
/* BIN */ { NULL, NULL, NULL, NULL, NULL, NULL, c_bin2str, c_none, c_str2meth, },
/* METH */ { NULL, NULL, NULL, NULL, NULL, NULL, c_meth2str, c_meth2str, c_none, },
};
/*
* Parse a sample expression configuration:
* fetch keyword followed by format conversion keywords.
* Returns a pointer on allocated sample expression structure.
* The caller must have set al->ctx.
*/
struct sample_expr *sample_parse_expr(char **str, int *idx, const char *file, int line, char **err_msg, struct arg_list *al)
{
const char *begw; /* beginning of word */
const char *endw; /* end of word */
const char *endt; /* end of term */
struct sample_expr *expr;
struct sample_fetch *fetch;
struct sample_conv *conv;
unsigned long prev_type;
char *fkw = NULL;
char *ckw = NULL;
int err_arg;
begw = str[*idx];
for (endw = begw; *endw && *endw != '(' && *endw != ','; endw++);
if (endw == begw) {
memprintf(err_msg, "missing fetch method");
goto out_error;
}
/* keep a copy of the current fetch keyword for error reporting */
fkw = my_strndup(begw, endw - begw);
fetch = find_sample_fetch(begw, endw - begw);
if (!fetch) {
memprintf(err_msg, "unknown fetch method '%s'", fkw);
goto out_error;
}
endt = endw;
if (*endt == '(') {
/* look for the end of this term and skip the opening parenthesis */
endt = ++endw;
while (*endt && *endt != ')')
endt++;
if (*endt != ')') {
memprintf(err_msg, "missing closing ')' after arguments to fetch keyword '%s'", fkw);
goto out_error;
}
}
/* At this point, we have :
* - begw : beginning of the keyword
* - endw : end of the keyword, first character not part of keyword
* nor the opening parenthesis (so first character of args
* if present).
* - endt : end of the term (=endw or last parenthesis if args are present)
*/
if (fetch->out_type >= SMP_TYPES) {
memprintf(err_msg, "returns type of fetch method '%s' is unknown", fkw);
goto out_error;
}
prev_type = fetch->out_type;
expr = calloc(1, sizeof(struct sample_expr));
if (!expr)
goto out_error;
LIST_INIT(&(expr->conv_exprs));
expr->fetch = fetch;
expr->arg_p = empty_arg_list;
/* Note that we call the argument parser even with an empty string,
* this allows it to automatically create entries for mandatory
* implicit arguments (eg: local proxy name).
*/
al->kw = expr->fetch->kw;
al->conv = NULL;
if (make_arg_list(endw, endt - endw, fetch->arg_mask, &expr->arg_p, err_msg, NULL, &err_arg, al) < 0) {
memprintf(err_msg, "fetch method '%s' : %s", fkw, *err_msg);
goto out_error;
}
if (!expr->arg_p) {
expr->arg_p = empty_arg_list;
}
else if (fetch->val_args && !fetch->val_args(expr->arg_p, err_msg)) {
memprintf(err_msg, "invalid args in fetch method '%s' : %s", fkw, *err_msg);
goto out_error;
}
/* Now process the converters if any. We have two supported syntaxes
* for the converters, which can be combined :
* - comma-delimited list of converters just after the keyword and args ;
* - one converter per keyword
* The combination allows to have each keyword being a comma-delimited
* series of converters.
*
* We want to process the former first, then the latter. For this we start
* from the beginning of the supposed place in the exiting conv chain, which
* starts at the last comma (endt).
*/
while (1) {
struct sample_conv_expr *conv_expr;
if (*endt == ')') /* skip last closing parenthesis */
endt++;
if (*endt && *endt != ',') {
if (ckw)
memprintf(err_msg, "missing comma after conv keyword '%s'", ckw);
else
memprintf(err_msg, "missing comma after fetch keyword '%s'", fkw);
goto out_error;
}
while (*endt == ',') /* then trailing commas */
endt++;
begw = endt; /* start of conv keyword */
if (!*begw) {
/* none ? skip to next string */
(*idx)++;
begw = str[*idx];
if (!begw || !*begw)
break;
}
for (endw = begw; *endw && *endw != '(' && *endw != ','; endw++);
free(ckw);
ckw = my_strndup(begw, endw - begw);
conv = find_sample_conv(begw, endw - begw);
if (!conv) {
/* we found an isolated keyword that we don't know, it's not ours */
if (begw == str[*idx])
break;
memprintf(err_msg, "unknown conv method '%s'", ckw);
goto out_error;
}
endt = endw;
if (*endt == '(') {
/* look for the end of this term */
while (*endt && *endt != ')')
endt++;
if (*endt != ')') {
memprintf(err_msg, "syntax error: missing ')' after conv keyword '%s'", ckw);
goto out_error;
}
}
if (conv->in_type >= SMP_TYPES || conv->out_type >= SMP_TYPES) {
memprintf(err_msg, "returns type of conv method '%s' is unknown", ckw);
goto out_error;
}
/* If impossible type conversion */
if (!sample_casts[prev_type][conv->in_type]) {
memprintf(err_msg, "conv method '%s' cannot be applied", ckw);
goto out_error;
}
prev_type = conv->out_type;
conv_expr = calloc(1, sizeof(struct sample_conv_expr));
if (!conv_expr)
goto out_error;
LIST_ADDQ(&(expr->conv_exprs), &(conv_expr->list));
conv_expr->conv = conv;
if (endt != endw) {
int err_arg;
if (!conv->arg_mask) {
memprintf(err_msg, "conv method '%s' does not support any args", ckw);
goto out_error;
}
al->kw = expr->fetch->kw;
al->conv = conv_expr->conv->kw;
if (make_arg_list(endw + 1, endt - endw - 1, conv->arg_mask, &conv_expr->arg_p, err_msg, NULL, &err_arg, al) < 0) {
memprintf(err_msg, "invalid arg %d in conv method '%s' : %s", err_arg+1, ckw, *err_msg);
goto out_error;
}
if (!conv_expr->arg_p)
conv_expr->arg_p = empty_arg_list;
if (conv->val_args && !conv->val_args(conv_expr->arg_p, conv, file, line, err_msg)) {
memprintf(err_msg, "invalid args in conv method '%s' : %s", ckw, *err_msg);
goto out_error;
}
}
else if (ARGM(conv->arg_mask)) {
memprintf(err_msg, "missing args for conv method '%s'", ckw);
goto out_error;
}
}
out:
free(fkw);
free(ckw);
return expr;
out_error:
/* TODO: prune_sample_expr(expr); */
expr = NULL;
goto out;
}
/*
* Process a fetch + format conversion of defined by the sample expression <expr>
* on request or response considering the <opt> parameter.
* Returns a pointer on a typed sample structure containing the result or NULL if
* sample is not found or when format conversion failed.
* If <p> is not null, function returns results in structure pointed by <p>.
* If <p> is null, functions returns a pointer on a static sample structure.
*
* Note: the fetch functions are required to properly set the return type. The
* conversion functions must do so too. However the cast functions do not need
* to since they're made to cast mutiple types according to what is required.
*
* The caller may indicate in <opt> if it considers the result final or not.
* The caller needs to check the SMP_F_MAY_CHANGE flag in p->flags to verify
* if the result is stable or not, according to the following table :
*
* return MAY_CHANGE FINAL Meaning for the sample
* NULL 0 * Not present and will never be (eg: header)
* NULL 1 0 Not present yet, could change (eg: POST param)
* NULL 1 1 Not present yet, will not change anymore
* smp 0 * Present and will not change (eg: header)
* smp 1 0 Present, may change (eg: request length)
* smp 1 1 Present, last known value (eg: request length)
*/
struct sample *sample_process(struct proxy *px, struct session *l4, void *l7,
unsigned int opt,
struct sample_expr *expr, struct sample *p)
{
struct sample_conv_expr *conv_expr;
if (p == NULL) {
p = &temp_smp;
memset(p, 0, sizeof(*p));
}
if (!expr->fetch->process(px, l4, l7, opt, expr->arg_p, p, expr->fetch->kw))
return NULL;
list_for_each_entry(conv_expr, &expr->conv_exprs, list) {
/* we want to ensure that p->type can be casted into
* conv_expr->conv->in_type. We have 3 possibilities :
* - NULL => not castable.
* - c_none => nothing to do (let's optimize it)
* - other => apply cast and prepare to fail
*/
if (!sample_casts[p->type][conv_expr->conv->in_type])
return NULL;
if (sample_casts[p->type][conv_expr->conv->in_type] != c_none &&
!sample_casts[p->type][conv_expr->conv->in_type](p))
return NULL;
/* OK cast succeeded */
if (!conv_expr->conv->process(conv_expr->arg_p, p))
return NULL;
}
return p;
}
/*
* Resolve all remaining arguments in proxy <p>. Returns the number of
* errors or 0 if everything is fine.
*/
int smp_resolve_args(struct proxy *p)
{
struct arg_list *cur, *bak;
const char *ctx, *where;
const char *conv_ctx, *conv_pre, *conv_pos;
struct userlist *ul;
struct arg *arg;
int cfgerr = 0;
list_for_each_entry_safe(cur, bak, &p->conf.args.list, list) {
struct proxy *px;
struct server *srv;
char *pname, *sname;
arg = cur->arg;
/* prepare output messages */
conv_pre = conv_pos = conv_ctx = "";
if (cur->conv) {
conv_ctx = cur->conv;
conv_pre = "conversion keyword '";
conv_pos = "' for ";
}
where = "in";
ctx = "sample fetch keyword";
switch (cur->ctx) {
case ARGC_STK:where = "in stick rule in"; break;
case ARGC_TRK: where = "in tracking rule in"; break;
case ARGC_LOG: where = "in log-format string in"; break;
case ARGC_HRQ: where = "in http-request header format string in"; break;
case ARGC_HRS: where = "in http-response header format string in"; break;
case ARGC_UIF: where = "in unique-id-format string in"; break;
case ARGC_RDR: where = "in redirect format string in"; break;
case ARGC_CAP: where = "in capture rule in"; break;
case ARGC_ACL: ctx = "ACL keyword"; break;
}
/* set a few default settings */
px = p;
pname = p->id;
switch (arg->type) {
case ARGT_SRV:
if (!arg->data.str.len) {
Alert("parsing [%s:%d] : missing server name in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
continue;
}
/* we support two formats : "bck/srv" and "srv" */
sname = strrchr(arg->data.str.str, '/');
if (sname) {
*sname++ = '\0';
pname = arg->data.str.str;
px = findproxy(pname, PR_CAP_BE);
if (!px) {
Alert("parsing [%s:%d] : unable to find proxy '%s' referenced in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
}
else
sname = arg->data.str.str;
srv = findserver(px, sname);
if (!srv) {
Alert("parsing [%s:%d] : unable to find server '%s' in proxy '%s', referenced in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line, sname, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
free(arg->data.str.str);
arg->data.str.str = NULL;
arg->unresolved = 0;
arg->data.srv = srv;
break;
case ARGT_FE:
if (arg->data.str.len) {
pname = arg->data.str.str;
px = findproxy(pname, PR_CAP_FE);
}
if (!px) {
Alert("parsing [%s:%d] : unable to find frontend '%s' referenced in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
if (!(px->cap & PR_CAP_FE)) {
Alert("parsing [%s:%d] : proxy '%s', referenced in arg %d of %s%s%s%s '%s' %s proxy '%s', has not frontend capability.\n",
cur->file, cur->line, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
free(arg->data.str.str);
arg->data.str.str = NULL;
arg->unresolved = 0;
arg->data.prx = px;
break;
case ARGT_BE:
if (arg->data.str.len) {
pname = arg->data.str.str;
px = findproxy(pname, PR_CAP_BE);
}
if (!px) {
Alert("parsing [%s:%d] : unable to find backend '%s' referenced in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
if (!(px->cap & PR_CAP_BE)) {
Alert("parsing [%s:%d] : proxy '%s', referenced in arg %d of %s%s%s%s '%s' %s proxy '%s', has not backend capability.\n",
cur->file, cur->line, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
free(arg->data.str.str);
arg->data.str.str = NULL;
arg->unresolved = 0;
arg->data.prx = px;
break;
case ARGT_TAB:
if (arg->data.str.len) {
pname = arg->data.str.str;
px = find_stktable(pname);
}
if (!px) {
Alert("parsing [%s:%d] : unable to find table '%s' referenced in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
if (!px->table.size) {
Alert("parsing [%s:%d] : no table in proxy '%s' referenced in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line, pname,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
free(arg->data.str.str);
arg->data.str.str = NULL;
arg->unresolved = 0;
arg->data.prx = px;
break;
case ARGT_USR:
if (!arg->data.str.len) {
Alert("parsing [%s:%d] : missing userlist name in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
if (p->uri_auth && p->uri_auth->userlist &&
!strcmp(p->uri_auth->userlist->name, arg->data.str.str))
ul = p->uri_auth->userlist;
else
ul = auth_find_userlist(arg->data.str.str);
if (!ul) {
Alert("parsing [%s:%d] : unable to find userlist '%s' referenced in arg %d of %s%s%s%s '%s' %s proxy '%s'.\n",
cur->file, cur->line, arg->data.str.str,
cur->arg_pos + 1, conv_pre, conv_ctx, conv_pos, ctx, cur->kw, where, p->id);
cfgerr++;
break;
}
free(arg->data.str.str);
arg->data.str.str = NULL;
arg->unresolved = 0;
arg->data.usr = ul;
break;
}
LIST_DEL(&cur->list);
free(cur);
} /* end of args processing */
return cfgerr;
}
/*
* Process a fetch + format conversion as defined by the sample expression
* <expr> on request or response considering the <opt> parameter. The output is
* always of type string. If a stable sample can be fetched, or an unstable one
* when <opt> contains SMP_OPT_FINAL, the sample is converted to a string and
* returned without the SMP_F_MAY_CHANGE flag. If an unstable sample is found
* and <opt> does not contain SMP_OPT_FINAL, then the sample is returned as-is
* with its SMP_F_MAY_CHANGE flag so that the caller can check it and decide to
* take actions (eg: wait longer). If a sample could not be found or could not
* be converted, NULL is returned. The caller MUST NOT use the sample if the
* SMP_F_MAY_CHANGE flag is present, as it is used only as a hint that there is
* still hope to get it after waiting longer, and is not converted to string.
* The possible output combinations are the following :
*
* return MAY_CHANGE FINAL Meaning for the sample
* NULL * * Not present and will never be (eg: header)
* smp 0 * Final value converted (eg: header)
* smp 1 0 Not present yet, may appear later (eg: header)
* smp 1 1 never happens (either flag is cleared on output)
*/
struct sample *sample_fetch_string(struct proxy *px, struct session *l4, void *l7,
unsigned int opt, struct sample_expr *expr)
{
struct sample *smp = &temp_smp;
memset(smp, 0, sizeof(*smp));
if (!sample_process(px, l4, l7, opt, expr, smp)) {
if ((smp->flags & SMP_F_MAY_CHANGE) && !(opt & SMP_OPT_FINAL))
return smp;
return NULL;
}
if (!sample_casts[smp->type][SMP_T_STR])
return NULL;
if (!sample_casts[smp->type][SMP_T_STR](smp))
return NULL;
smp->type = SMP_T_STR;
smp->flags &= ~SMP_F_MAY_CHANGE;
return smp;
}
/*****************************************************************/
/* Sample format convert functions */
/* These functions set the data type on return. */
/*****************************************************************/
static int sample_conv_bin2base64(const struct arg *arg_p, struct sample *smp)
{
struct chunk *trash = get_trash_chunk();
int b64_len;
trash->len = 0;
b64_len = a2base64(smp->data.str.str, smp->data.str.len, trash->str, trash->size);
if (b64_len < 0)
return 0;
trash->len = b64_len;
smp->data.str = *trash;
smp->type = SMP_T_STR;
smp->flags &= ~SMP_F_CONST;
return 1;
}
static int sample_conv_bin2hex(const struct arg *arg_p, struct sample *smp)
{
struct chunk *trash = get_trash_chunk();
unsigned char c;
int ptr = 0;
trash->len = 0;
while (ptr < smp->data.str.len && trash->len <= trash->size - 2) {
c = smp->data.str.str[ptr++];
trash->str[trash->len++] = hextab[(c >> 4) & 0xF];
trash->str[trash->len++] = hextab[c & 0xF];
}
smp->data.str = *trash;
smp->type = SMP_T_STR;
smp->flags &= ~SMP_F_CONST;
return 1;
}
/* hashes the binary input into a 32-bit unsigned int */
static int sample_conv_djb2(const struct arg *arg_p, struct sample *smp)
{
smp->data.uint = hash_djb2(smp->data.str.str, smp->data.str.len);
if (arg_p && arg_p->data.uint)
smp->data.uint = full_hash(smp->data.uint);
smp->type = SMP_T_UINT;
return 1;
}
static int sample_conv_str2lower(const struct arg *arg_p, struct sample *smp)
{
int i;
if (!smp_dup(smp))
return 0;
if (!smp->data.str.size)
return 0;
for (i = 0; i < smp->data.str.len; i++) {
if ((smp->data.str.str[i] >= 'A') && (smp->data.str.str[i] <= 'Z'))
smp->data.str.str[i] += 'a' - 'A';
}
return 1;
}
static int sample_conv_str2upper(const struct arg *arg_p, struct sample *smp)
{
int i;
if (!smp_dup(smp))
return 0;
if (!smp->data.str.size)
return 0;
for (i = 0; i < smp->data.str.len; i++) {
if ((smp->data.str.str[i] >= 'a') && (smp->data.str.str[i] <= 'z'))
smp->data.str.str[i] += 'A' - 'a';
}
return 1;
}
/* takes the netmask in arg_p */
static int sample_conv_ipmask(const struct arg *arg_p, struct sample *smp)
{
smp->data.ipv4.s_addr &= arg_p->data.ipv4.s_addr;
smp->type = SMP_T_IPV4;
return 1;
}
/* takes an UINT value on input supposed to represent the time since EPOCH,
* adds an optional offset found in args[1] and emits a string representing
* the local time in the format specified in args[1] using strftime().
*/
static int sample_conv_ltime(const struct arg *args, struct sample *smp)
{
struct chunk *temp;
time_t curr_date = smp->data.uint;
/* add offset */
if (args[1].type == ARGT_SINT || args[1].type == ARGT_UINT)
curr_date += args[1].data.sint;
temp = get_trash_chunk();
temp->len = strftime(temp->str, temp->size, args[0].data.str.str, localtime(&curr_date));
smp->data.str = *temp;
smp->type = SMP_T_STR;
return 1;
}
/* hashes the binary input into a 32-bit unsigned int */
static int sample_conv_sdbm(const struct arg *arg_p, struct sample *smp)
{
smp->data.uint = hash_sdbm(smp->data.str.str, smp->data.str.len);
if (arg_p && arg_p->data.uint)
smp->data.uint = full_hash(smp->data.uint);
smp->type = SMP_T_UINT;
return 1;
}
/* takes an UINT value on input supposed to represent the time since EPOCH,
* adds an optional offset found in args[1] and emits a string representing
* the UTC date in the format specified in args[1] using strftime().
*/
static int sample_conv_utime(const struct arg *args, struct sample *smp)
{
struct chunk *temp;
time_t curr_date = smp->data.uint;
/* add offset */
if (args[1].type == ARGT_SINT || args[1].type == ARGT_UINT)
curr_date += args[1].data.sint;
temp = get_trash_chunk();
temp->len = strftime(temp->str, temp->size, args[0].data.str.str, gmtime(&curr_date));
smp->data.str = *temp;
smp->type = SMP_T_STR;
return 1;
}
/* hashes the binary input into a 32-bit unsigned int */
static int sample_conv_wt6(const struct arg *arg_p, struct sample *smp)
{
smp->data.uint = hash_wt6(smp->data.str.str, smp->data.str.len);
if (arg_p && arg_p->data.uint)
smp->data.uint = full_hash(smp->data.uint);
smp->type = SMP_T_UINT;
return 1;
}
/************************************************************************/
/* All supported sample fetch functions must be declared here */
/************************************************************************/
/* force TRUE to be returned at the fetch level */
static int
smp_fetch_true(struct proxy *px, struct session *s, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp, const char *kw)
{
smp->type = SMP_T_BOOL;
smp->data.uint = 1;
return 1;
}
/* force FALSE to be returned at the fetch level */
static int
smp_fetch_false(struct proxy *px, struct session *s, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp, const char *kw)
{
smp->type = SMP_T_BOOL;
smp->data.uint = 0;
return 1;
}
/* retrieve environment variable $1 as a string */
static int
smp_fetch_env(struct proxy *px, struct session *s, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp, const char *kw)
{
char *env;
if (!args || args[0].type != ARGT_STR)
return 0;
env = getenv(args[0].data.str.str);
if (!env)
return 0;
smp->type = SMP_T_STR;
smp->flags = SMP_F_CONST;
smp->data.str.str = env;
smp->data.str.len = strlen(env);
return 1;
}
/* retrieve the current local date in epoch time, and applies an optional offset
* of args[0] seconds.
*/
static int
smp_fetch_date(struct proxy *px, struct session *s, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp, const char *kw)
{
smp->data.uint = date.tv_sec;
/* add offset */
if (args && (args[0].type == ARGT_SINT || args[0].type == ARGT_UINT))
smp->data.uint += args[0].data.sint;
smp->type = SMP_T_UINT;
smp->flags |= SMP_F_VOL_TEST | SMP_F_MAY_CHANGE;
return 1;
}
/* generate a random 32-bit integer for whatever purpose, with an optional
* range specified in argument.
*/
static int
smp_fetch_rand(struct proxy *px, struct session *s, void *l7, unsigned int opt,
const struct arg *args, struct sample *smp, const char *kw)
{
smp->data.uint = random();
/* reduce if needed. Don't do a modulo, use all bits! */
if (args && args[0].type == ARGT_UINT)
smp->data.uint = ((uint64_t)smp->data.uint * args[0].data.uint) >> 32;
smp->type = SMP_T_UINT;
smp->flags |= SMP_F_VOL_TEST | SMP_F_MAY_CHANGE;
return 1;
}
/* Note: must not be declared <const> as its list will be overwritten.
* Note: fetches that may return multiple types must be declared as the lowest
* common denominator, the type that can be casted into all other ones. For
* instance IPv4/IPv6 must be declared IPv4.
*/
static struct sample_fetch_kw_list smp_kws = {ILH, {
{ "always_false", smp_fetch_false, 0, NULL, SMP_T_BOOL, SMP_USE_INTRN },
{ "always_true", smp_fetch_true, 0, NULL, SMP_T_BOOL, SMP_USE_INTRN },
{ "env", smp_fetch_env, ARG1(1,STR), NULL, SMP_T_STR, SMP_USE_INTRN },
{ "date", smp_fetch_date, ARG1(0,SINT), NULL, SMP_T_UINT, SMP_USE_INTRN },
{ "rand", smp_fetch_rand, ARG1(0,UINT), NULL, SMP_T_UINT, SMP_USE_INTRN },
{ /* END */ },
}};
/* Note: must not be declared <const> as its list will be overwritten */
static struct sample_conv_kw_list sample_conv_kws = {ILH, {
{ "base64", sample_conv_bin2base64,0, NULL, SMP_T_BIN, SMP_T_STR },
{ "upper", sample_conv_str2upper, 0, NULL, SMP_T_STR, SMP_T_STR },
{ "lower", sample_conv_str2lower, 0, NULL, SMP_T_STR, SMP_T_STR },
{ "hex", sample_conv_bin2hex, 0, NULL, SMP_T_BIN, SMP_T_STR },
{ "ipmask", sample_conv_ipmask, ARG1(1,MSK4), NULL, SMP_T_IPV4, SMP_T_IPV4 },
{ "ltime", sample_conv_ltime, ARG2(1,STR,SINT), NULL, SMP_T_UINT, SMP_T_STR },
{ "utime", sample_conv_utime, ARG2(1,STR,SINT), NULL, SMP_T_UINT, SMP_T_STR },
{ "djb2", sample_conv_djb2, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "sdbm", sample_conv_sdbm, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "wt6", sample_conv_wt6, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ NULL, NULL, 0, 0, 0 },
}};
__attribute__((constructor))
static void __sample_init(void)
{
/* register sample fetch and format conversion keywords */
sample_register_fetches(&smp_kws);
sample_register_convs(&sample_conv_kws);
}
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