diff --git a/contrib/opentracing/src/parser.c b/contrib/opentracing/src/parser.c
new file mode 100644
index 0000000..b53d58d
--- /dev/null
+++ b/contrib/opentracing/src/parser.c
@@ -0,0 +1,1216 @@
+/***
+ * Copyright 2020 HAProxy Technologies
+ *
+ * This file is part of the HAProxy OpenTracing filter.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+#include "include.h"
+
+
+#ifdef DEBUG_OT
+struct flt_ot_debug               flt_ot_debug;
+THREAD_LOCAL int                  dbg_indent_level = 0;
+#endif
+
+#ifdef OTC_DBG_MEM
+static struct otc_dbg_mem_data    dbg_mem_data[1000000];
+static struct otc_dbg_mem         dbg_mem;
+#endif
+
+static struct flt_ot_conf        *flt_ot_current_config = NULL;
+static struct flt_ot_conf_tracer *flt_ot_current_tracer = NULL;
+static struct flt_ot_conf_group  *flt_ot_current_group = NULL;
+static struct flt_ot_conf_scope  *flt_ot_current_scope = NULL;
+static struct flt_ot_conf_span   *flt_ot_current_span = NULL;
+
+
+/***
+ * NAME
+ *   flt_ot_parse_strdup -
+ *
+ * ARGUMENTS
+ *   ptr     -
+ *   str     -
+ *   err     -
+ *   err_msg -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_strdup(char **ptr, const char *str, char **err, const char *err_msg)
+{
+	int retval = ERR_NONE;
+
+	FLT_OT_FUNC("%p:%p, %p, %p:%p, \"%s\"", FLT_OT_DPTR_ARGS(ptr), str, FLT_OT_DPTR_ARGS(err), err_msg);
+
+	*ptr = FLT_OT_STRDUP(str);
+	if (*ptr == NULL) {
+		FLT_OT_PARSE_ERR(err, "'%s' : out of memory", err_msg);
+
+		retval |= ERR_ABORT | ERR_ALERT;
+	}
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_keyword -
+ *
+ * ARGUMENTS
+ *   ptr     -
+ *   args    -
+ *   cur_arg -
+ *   pos     -
+ *   err     -
+ *   err_msg -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_keyword(char **ptr, char **args, int cur_arg, int pos, char **err, const char *err_msg)
+{
+	int retval = ERR_NONE;
+
+	FLT_OT_FUNC("%p:%p, %p, %d, %d, %p:%p, \"%s\"", FLT_OT_DPTR_ARGS(ptr), args, cur_arg, pos, FLT_OT_DPTR_ARGS(err), err_msg);
+
+	if (*ptr != NULL) {
+		if (cur_arg == pos)
+			FLT_OT_PARSE_ERR(err, FLT_OT_FMT_TYPE "%s already set", err_msg);
+		else
+			FLT_OT_PARSE_ERR(err, "'%s' : %s already set", args[cur_arg], err_msg);
+	}
+	else if (!FLT_OT_ARG_ISVALID(pos + 1)) {
+		if (cur_arg == pos)
+			FLT_OT_PARSE_ERR(err, FLT_OT_FMT_TYPE "no %s set", err_msg);
+		else
+			FLT_OT_PARSE_ERR(err, "'%s' : no %s set", args[cur_arg], err_msg);
+	}
+	else {
+		retval = flt_ot_parse_strdup(ptr, args[pos + 1], err, args[cur_arg]);
+	}
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_invalid_char -
+ *
+ * ARGUMENTS
+ *   name -
+ *   type -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   -
+ */
+static const char *flt_ot_parse_invalid_char(const char *name, int type)
+{
+	const char *retptr = NULL;
+
+	FLT_OT_FUNC("\"%s\", %d", name, type);
+
+	if (!FLT_OT_STR_ISVALID(name))
+		FLT_OT_RETURN(retptr);
+
+	if (type == 1) {
+		retptr = invalid_char(name);
+	}
+	else if (type == 2) {
+		retptr = invalid_domainchar(name);
+	}
+	else if (type == 3) {
+		retptr = invalid_prefix_char(name);
+	}
+	else if (type == 4) {
+		retptr = name;
+
+		/*
+		 * Allowed characters are letters, numbers and '_', the first
+		 * character in the string must not be a number.
+		 */
+		if (!isdigit(*retptr))
+			for (++retptr; (*retptr == '_') || isalnum(*retptr); retptr++);
+
+		if (*retptr == '\0')
+			retptr = NULL;
+	}
+
+	FLT_OT_RETURN(retptr);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_check -
+ *
+ * ARGUMENTS
+ *   file            -
+ *   linenum         -
+ *   args            -
+ *   id              -
+ *   parse_data      -
+ *   parse_data_size -
+ *   pdata           -
+ *   err             -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_check(const char *file, int linenum, char **args, const void *id, const struct flt_ot_parse_data *parse_data, size_t parse_data_size, const struct flt_ot_parse_data **pdata, char **err)
+{
+	int i, retval = ERR_NONE;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, %p, %p, %zu, %p:%p, %p:%p", file, linenum, args, id, parse_data, parse_data_size, FLT_OT_DPTR_ARGS(pdata), FLT_OT_DPTR_ARGS(err));
+
+	FLT_OT_ARGS_DUMP();
+
+	*pdata = NULL;
+
+	for (i = 0; (*pdata == NULL) && (i < parse_data_size); i++)
+		if (strcmp(parse_data[i].name, args[0]) == 0)
+			*pdata = parse_data + i;
+
+	if (*pdata == NULL)
+		FLT_OT_PARSE_ERR(err, "'%s' : unknown keyword", args[0]);
+
+	if ((retval & ERR_CODE) || (id == NULL))
+		/* Do nothing. */;
+	else if ((id != flt_ot_current_tracer) && (flt_ot_current_config->tracer == NULL))
+		FLT_OT_PARSE_ERR(err, "tracer not defined");
+
+	/*
+	 * Checking that fewer arguments are specified in the configuration
+	 * line than is required.
+	 */
+	if (!(retval & ERR_CODE))
+		for (i = 1; i < (*pdata)->args_min; i++)
+			if (!FLT_OT_ARG_ISVALID(i))
+				FLT_OT_PARSE_ERR(err, "'%s' : too few arguments (use '%s%s')", args[0], (*pdata)->name, (*pdata)->usage);
+
+	/*
+	 * Checking that more arguments are specified in the configuration
+	 * line than the maximum allowed.
+	 */
+	if (!(retval & ERR_CODE) && ((*pdata)->args_max > 0)) {
+		for ( ; (i <= (*pdata)->args_max) && FLT_OT_ARG_ISVALID(i); i++);
+
+		if (i > (*pdata)->args_max)
+			FLT_OT_PARSE_ERR(err, "'%s' : too many arguments (use '%s%s')", args[0], (*pdata)->name, (*pdata)->usage);
+	}
+
+	/* Checking that the first argument has only allowed characters. */
+	if (!(retval & ERR_CODE) && ((*pdata)->check_name > 0)) {
+		const char *ic;
+
+		ic = flt_ot_parse_invalid_char(args[1], (*pdata)->check_name);
+		if (ic != NULL)
+			FLT_OT_PARSE_ERR(err, "%s '%s' : invalid character '%c'", args[0], args[1], *ic);
+	}
+
+	/* Checking that the data group name is defined. */
+	if (!(retval & ERR_CODE) && (*pdata)->flag_check_id && (id == NULL))
+		FLT_OT_PARSE_ERR(err, "'%s' : %s ID not set (use '%s%s')", args[0], parse_data[1].name, parse_data[1].name, parse_data[1].usage);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_sample_expr -
+ *
+ * ARGUMENTS
+ *   file    -
+ *   linenum -
+ *   args    -
+ *   idx     -
+ *   head    -
+ *   err     -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_sample_expr(const char *file, int linenum, char **args, int *idx, struct list *head, char **err)
+{
+	struct flt_ot_conf_sample_expr *expr;
+	int                             retval = ERR_NONE;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, %p, %p, %p:%p", file, linenum, args, idx, head, FLT_OT_DPTR_ARGS(err));
+
+	expr = flt_ot_conf_sample_expr_init(args[*idx], linenum, head, err);
+	if (expr != NULL) {
+		expr->expr = sample_parse_expr(args, idx, file, linenum, err, &(flt_ot_current_config->proxy->conf.args), NULL);
+		if (expr->expr != NULL)
+			FLT_OT_DBG(3, "sample expression '%s' added", expr->value);
+		else
+			retval |= ERR_ABORT | ERR_ALERT;
+	} else {
+			retval |= ERR_ABORT | ERR_ALERT;
+	}
+
+	if (retval & ERR_CODE)
+		flt_ot_conf_sample_expr_free(&expr);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_sample -
+ *
+ * ARGUMENTS
+ *   file    -
+ *   linenum -
+ *   args    -
+ *   head    -
+ *   err     -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_sample(const char *file, int linenum, char **args, struct list *head, char **err)
+{
+	struct flt_ot_conf_sample *sample;
+	int                        idx = 2, retval = ERR_NONE;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, %p, %p:%p", file, linenum, args, head, FLT_OT_DPTR_ARGS(err));
+
+	sample = flt_ot_conf_sample_init(args, linenum, head, err);
+	if (sample == NULL)
+		FLT_OT_PARSE_ERR(err, "'%s' : out of memory", args[0]);
+
+	if (!(retval & ERR_CODE)) {
+		flt_ot_current_config->proxy->conf.args.ctx  = ARGC_OT;
+		flt_ot_current_config->proxy->conf.args.file = file;
+		flt_ot_current_config->proxy->conf.args.line = linenum;
+
+		while (!(retval & ERR_CODE) && FLT_OT_ARG_ISVALID(idx))
+			retval = flt_ot_parse_cfg_sample_expr(file, linenum, args, &idx, &(sample->exprs), err);
+
+		flt_ot_current_config->proxy->conf.args.file = NULL;
+		flt_ot_current_config->proxy->conf.args.line = 0;
+	}
+
+	if (retval & ERR_CODE)
+		flt_ot_conf_sample_free(&sample);
+	else
+		FLT_OT_DBG(3, "sample '%s' -> '%s' added", sample->key, sample->value);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_str -
+ *
+ * ARGUMENTS
+ *   file    -
+ *   linenum -
+ *   args    -
+ *   head    -
+ *   err     -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_str(const char *file, int linenum, char **args, struct list *head, char **err)
+{
+	struct flt_ot_conf_str *str = NULL;
+	int                     i, retval = ERR_NONE;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, %p, %p:%p", file, linenum, args, head, FLT_OT_DPTR_ARGS(err));
+
+	for (i = 1; !(retval & ERR_CODE) && FLT_OT_ARG_ISVALID(i); i++)
+		if (flt_ot_conf_str_init(args[i], linenum, head, err) == NULL)
+			retval |= ERR_ABORT | ERR_ALERT;
+
+	if (retval & ERR_CODE)
+		flt_ot_conf_str_free(&str);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_file -
+ *
+ * ARGUMENTS
+ *   ptr     -
+ *   file    -
+ *   linenum -
+ *   args    -
+ *   err     -
+ *   err_msg -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_file(char **ptr, const char *file, int linenum, char **args, char **err, const char *err_msg)
+{
+	int retval = ERR_NONE;
+
+	FLT_OT_FUNC("%p:%p, \"%s\", %d, %p, %p:%p, \"%s\"", FLT_OT_DPTR_ARGS(ptr), file, linenum, args, FLT_OT_DPTR_ARGS(err), err_msg);
+
+	if (!FLT_OT_ARG_ISVALID(1))
+		FLT_OT_PARSE_ERR(err, "'%s' : no %s specified", flt_ot_current_tracer->id, err_msg);
+	else if (alertif_too_many_args(1, file, linenum, args, &retval))
+		retval |= ERR_ABORT | ERR_ALERT;
+	else if (access(args[1], R_OK) == -1)
+		FLT_OT_PARSE_ERR(err, "'%s' : %s", args[1], strerror(errno));
+	else
+		retval = flt_ot_parse_keyword(ptr, args, 0, 0, err, err_msg);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_check_scope -
+ *
+ * ARGUMENTS
+ *   This function takes no arguments.
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns TRUE in case the configuration is not in the currently defined
+ *   scope, FALSE otherwise.
+ */
+static bool flt_ot_parse_check_scope(void)
+{
+	bool retval = 0;
+
+	if ((cfg_scope != NULL) && (flt_ot_current_config->id != NULL) && (strcmp(flt_ot_current_config->id, cfg_scope) != 0)) {
+		FLT_OT_DBG(1, "cfg_scope: '%s', id: '%s'", cfg_scope, flt_ot_current_config->id);
+
+		retval = 1;
+	}
+
+	return retval;
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_tracer -
+ *
+ * ARGUMENTS
+ *   file    -
+ *   linenum -
+ *   args    -
+ *   kw_mod  -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_tracer(const char *file, int linenum, char **args, int kw_mod)
+{
+#define FLT_OT_PARSE_TRACER_DEF(a,b,c,d,e,f,g)   { FLT_OT_PARSE_TRACER_##a, b, c, d, e, f, g },
+	static const struct flt_ot_parse_data  parse_data[] = { FLT_OT_PARSE_TRACER_DEFINES };
+#undef FLT_OT_PARSE_TRACER_DEF
+	const struct flt_ot_parse_data        *pdata = NULL;
+	char                                  *err = NULL, *err_log = NULL;
+	int                                    i, retval = ERR_NONE;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, 0x%08x", file, linenum, args, kw_mod);
+
+	if (flt_ot_parse_check_scope())
+		FLT_OT_RETURN(retval);
+
+	retval = flt_ot_parse_cfg_check(file, linenum, args, flt_ot_current_tracer, parse_data, FLT_OT_TABLESIZE(parse_data), &pdata, &err);
+	if (retval & ERR_CODE) {
+		FLT_OT_PARSE_IFERR_ALERT();
+
+		FLT_OT_RETURN(retval);
+	}
+
+	if (pdata->keyword == FLT_OT_PARSE_TRACER_ID) {
+		if (flt_ot_current_config->tracer != NULL) {
+			FLT_OT_PARSE_ERR(&err, "'%s' : tracer can be defined only once", args[1]);
+		} else {
+			flt_ot_current_tracer = flt_ot_conf_tracer_init(args[1], linenum, &err);
+			if (flt_ot_current_tracer == NULL)
+				retval |= ERR_ABORT | ERR_ALERT;
+		}
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_LOG) {
+		if (parse_logsrv(args, &(flt_ot_current_tracer->proxy_log.logsrvs), kw_mod == KWM_NO, &err_log) == 0) {
+			FLT_OT_PARSE_ERR(&err, "'%s %s ...' : %s", args[0], args[1], err_log);
+			FLT_OT_FREE_CLEAR(err_log);
+
+			retval |= ERR_ABORT | ERR_ALERT;
+		} else {
+			flt_ot_current_tracer->logging |= FLT_OT_LOGGING_ON;
+		}
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_CONFIG) {
+		retval = flt_ot_parse_cfg_file(&(flt_ot_current_tracer->config), file, linenum, args, &err, "configuration file");
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_PLUGIN) {
+		retval = flt_ot_parse_cfg_file(&(flt_ot_current_tracer->plugin), file, linenum, args, &err, "plugin library");
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_GROUPS) {
+		for (i = 1; !(retval & ERR_CODE) && FLT_OT_ARG_ISVALID(i); i++)
+			if (flt_ot_conf_ph_init(args[i], linenum, &(flt_ot_current_tracer->ph_groups), &err) == NULL)
+				retval |= ERR_ABORT | ERR_ALERT;
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_SCOPES) {
+		for (i = 1; !(retval & ERR_CODE) && FLT_OT_ARG_ISVALID(i); i++)
+			if (flt_ot_conf_ph_init(args[i], linenum, &(flt_ot_current_tracer->ph_scopes), &err) == NULL)
+				retval |= ERR_ABORT | ERR_ALERT;
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_ACL) {
+		if (strcasecmp(args[1], "or") == 0)
+			FLT_OT_PARSE_ERR(&err, "'%s %s ...' : invalid ACL name", args[0], args[1]);
+		else if (parse_acl((const char **)args + 1, &(flt_ot_current_tracer->acls), &err, &(flt_ot_current_config->proxy->conf.args), file, linenum) == NULL)
+			retval |= ERR_ABORT | ERR_ALERT;
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_RATE_LIMIT) {
+		flt_ot_current_tracer->rate_limit = FLT_OT_FLOAT_U32(flt_ot_strtod(args[1], 0.0, FLT_OT_RATE_LIMIT_MAX, &err), FLT_OT_RATE_LIMIT_MAX);
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_OPTION) {
+		if (strcmp(args[1], FLT_OT_PARSE_OPTION_DISABLED) == 0) {
+			flt_ot_current_tracer->flag_disabled = (kw_mod == KWM_NO) ? 0 : 1;
+		}
+		else if (strcmp(args[1], FLT_OT_PARSE_OPTION_HARDERR) == 0) {
+			flt_ot_current_tracer->flag_harderr = (kw_mod == KWM_NO) ? 0 : 1;
+		}
+		else if (strcmp(args[1], FLT_OT_PARSE_OPTION_NOLOGNORM) == 0) {
+			if (kw_mod == KWM_NO)
+				flt_ot_current_tracer->logging &= ~FLT_OT_LOGGING_NOLOGNORM;
+			else
+				flt_ot_current_tracer->logging |= FLT_OT_LOGGING_NOLOGNORM;
+		}
+		else
+			FLT_OT_PARSE_ERR(&err, "'%s' : unknown option '%s'", args[0], args[1]);
+	}
+#ifdef DEBUG_OT
+	else if (pdata->keyword == FLT_OT_PARSE_TRACER_DEBUG_LEVEL) {
+		flt_ot_debug.level = flt_ot_strtoll(args[1], 0, 255, &err);
+	}
+#else
+	else {
+		FLT_OT_PARSE_WARNING("'%s' : keyword ignored", file, linenum, args[0]);
+	}
+#endif
+
+	FLT_OT_PARSE_IFERR_ALERT();
+
+	if ((retval & ERR_CODE) && (flt_ot_current_tracer != NULL))
+		flt_ot_conf_tracer_free(&flt_ot_current_tracer);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_post_parse_cfg_tracer -
+ *
+ * ARGUMENTS
+ *   This function takes no arguments.
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_post_parse_cfg_tracer(void)
+{
+	int retval = ERR_NONE;
+
+	FLT_OT_FUNC("");
+
+	if (flt_ot_current_tracer == NULL)
+		FLT_OT_RETURN(retval);
+
+	flt_ot_current_config->tracer = flt_ot_current_tracer;
+
+	if (flt_ot_current_tracer->id == NULL)
+		FLT_OT_RETURN(retval);
+
+	if (flt_ot_current_tracer->config == NULL)
+		FLT_OT_POST_PARSE_ALERT("tracer '%s' has no configuration file specified", flt_ot_current_tracer->cfg_line, flt_ot_current_tracer->id);
+
+	if (flt_ot_current_tracer->plugin == NULL)
+		FLT_OT_POST_PARSE_ALERT("tracer '%s' has no plugin library specified", flt_ot_current_tracer->cfg_line, flt_ot_current_tracer->id);
+
+	flt_ot_current_tracer = NULL;
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_group -
+ *
+ * ARGUMENTS
+ *   file    -
+ *   linenum -
+ *   args    -
+ *   kw_mod  -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_group(const char *file, int linenum, char **args, int kw_mod)
+{
+#define FLT_OT_PARSE_GROUP_DEF(a,b,c,d,e,f,g)   { FLT_OT_PARSE_GROUP_##a, b, c, d, e, f, g },
+	static const struct flt_ot_parse_data  parse_data[] = { FLT_OT_PARSE_GROUP_DEFINES };
+#undef FLT_OT_PARSE_GROUP_DEF
+	const struct flt_ot_parse_data        *pdata = NULL;
+	char                                  *err = NULL;
+	int                                    i, retval = ERR_NONE;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, 0x%08x", file, linenum, args, kw_mod);
+
+	if (flt_ot_parse_check_scope())
+		FLT_OT_RETURN(retval);
+
+	retval = flt_ot_parse_cfg_check(file, linenum, args, flt_ot_current_group, parse_data, FLT_OT_TABLESIZE(parse_data), &pdata, &err);
+	if (retval & ERR_CODE) {
+		FLT_OT_PARSE_IFERR_ALERT();
+
+		FLT_OT_RETURN(retval);
+	}
+
+	if (pdata->keyword == FLT_OT_PARSE_GROUP_ID) {
+		flt_ot_current_group = flt_ot_conf_group_init(args[1], linenum, &(flt_ot_current_config->groups), &err);
+		if (flt_ot_current_config == NULL)
+			retval |= ERR_ABORT | ERR_ALERT;
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_GROUP_SCOPES) {
+		for (i = 1; !(retval & ERR_CODE) && FLT_OT_ARG_ISVALID(i); i++)
+			if (flt_ot_conf_ph_init(args[i], linenum, &(flt_ot_current_group->ph_scopes), &err) == NULL)
+				retval |= ERR_ABORT | ERR_ALERT;
+	}
+
+	FLT_OT_PARSE_IFERR_ALERT();
+
+	if ((retval & ERR_CODE) && (flt_ot_current_group != NULL))
+		flt_ot_conf_group_free(&flt_ot_current_group);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_post_parse_cfg_group -
+ *
+ * ARGUMENTS
+ *   This function takes no arguments.
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_post_parse_cfg_group(void)
+{
+	int retval = ERR_NONE;
+
+	FLT_OT_FUNC("");
+
+	if (flt_ot_current_group == NULL)
+		FLT_OT_RETURN(retval);
+
+	/* Check that the group has at least one scope defined. */
+	if (LIST_ISEMPTY(&(flt_ot_current_group->ph_scopes)))
+		FLT_OT_POST_PARSE_ALERT("group '%s' has no defined scope(s)", flt_ot_current_group->cfg_line, flt_ot_current_group->id);
+
+	flt_ot_current_group = NULL;
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_scope_ctx -
+ *
+ * ARGUMENTS
+ *   args    -
+ *   cur_arg -
+ *   err     -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_scope_ctx(char **args, int cur_arg, char **err)
+{
+	uint8_t flags = 0;
+	int     retval = ERR_NONE;
+
+	FLT_OT_FUNC("%p, %d, %p:%p", args, cur_arg, FLT_OT_DPTR_ARGS(err));
+
+	if (strcmp(args[cur_arg], FLT_OT_PARSE_CTX_USE_HEADERS) == 0)
+		flags = FLT_OT_CTX_USE_HEADERS;
+	else if (strcmp(args[cur_arg], FLT_OT_PARSE_CTX_USE_VARS) == 0)
+		flags = FLT_OT_CTX_USE_VARS;
+	else
+		FLT_OT_PARSE_ERR(err, "'%s' : invalid context storage type", args[0]);
+
+	if (flags == 0)
+		/* Do nothing. */;
+	else if (flt_ot_current_span->ctx_flags & flags)
+		FLT_OT_PARSE_ERR(err, "'%s' : %s already used", args[0], args[cur_arg]);
+	else
+		flt_ot_current_span->ctx_flags |= flags;
+
+	FLT_OT_DBG(2, "ctx_flags: 0x%02hhx (0x%02hhx)", flt_ot_current_span->ctx_flags, flags);
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_acl -
+ *
+ * ARGUMENTS
+ *   file    -
+ *   linenum -
+ *   px      -
+ *   args    -
+ *   err     -
+ *   head    -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   -
+ */
+static struct acl_cond *flt_ot_parse_acl(const char *file, int linenum, struct proxy *px, const char **args, char **err, struct list *head, ...)
+{
+	va_list          ap;
+	int              n = 0;
+	struct acl_cond *retptr = NULL;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, %p, %p:%p, %p, ...", file, linenum, px, args, FLT_OT_DPTR_ARGS(err), head);
+
+	for (va_start(ap, head); (retptr == NULL) && (head != NULL); head = va_arg(ap, typeof(head)), n++) {
+		retptr = build_acl_cond(file, linenum, head, px, args, (n == 0) ? err : NULL);
+		if (retptr != NULL)
+			FLT_OT_DBG(2, "ACL build done, using list %p %d", head, n);
+	}
+	va_end(ap);
+
+	if ((retptr != NULL) && (err != NULL))
+		FLT_OT_FREE_CLEAR(*err);
+
+	FLT_OT_RETURN(retptr);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg_scope -
+ *
+ * ARGUMENTS
+ *   file    -
+ *   linenum -
+ *   args    -
+ *   kw_mod  -
+ *
+ * DESCRIPTION
+ *   Function used to load the scope block configuration.
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg_scope(const char *file, int linenum, char **args, int kw_mod)
+{
+#define FLT_OT_PARSE_SCOPE_DEF(a,b,c,d,e,f,g)   { FLT_OT_PARSE_SCOPE_##a, b, c, d, e, f, g },
+	static const struct flt_ot_parse_data  parse_data[] = { FLT_OT_PARSE_SCOPE_DEFINES };
+#undef FLT_OT_PARSE_SCOPE_DEF
+	const struct flt_ot_parse_data        *pdata = NULL;
+	char                                  *err = NULL;
+	int                                    i, retval = ERR_NONE;
+
+	FLT_OT_FUNC("\"%s\", %d, %p, 0x%08x", file, linenum, args, kw_mod);
+
+	if (flt_ot_parse_check_scope())
+		FLT_OT_RETURN(retval);
+
+	retval = flt_ot_parse_cfg_check(file, linenum, args, flt_ot_current_span, parse_data, FLT_OT_TABLESIZE(parse_data), &pdata, &err);
+	if (retval & ERR_CODE) {
+		FLT_OT_PARSE_IFERR_ALERT();
+
+		FLT_OT_RETURN(retval);
+	}
+
+	if (pdata->keyword == FLT_OT_PARSE_SCOPE_ID) {
+		/* Initialization of a new scope. */
+		flt_ot_current_scope = flt_ot_conf_scope_init(args[1], linenum, &(flt_ot_current_config->scopes), &err);
+		if (flt_ot_current_scope == NULL)
+			retval |= ERR_ABORT | ERR_ALERT;
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_SPAN) {
+		/*
+		 * Checking if this is the beginning of the definition of
+		 * a new span.
+		 */
+		if (flt_ot_current_span != NULL) {
+			FLT_OT_DBG(3, "span '%s' (done)", flt_ot_current_span->id);
+
+			flt_ot_current_span = NULL;
+		}
+
+		/* Initialization of a new span. */
+		flt_ot_current_span = flt_ot_conf_span_init(args[1], linenum, &(flt_ot_current_scope->spans), &err);
+
+		/*
+		 * In case the span has a defined reference,
+		 * the correctness of the arguments is checked here.
+		 */
+		if (flt_ot_current_span == NULL) {
+			retval |= ERR_ABORT | ERR_ALERT;
+		}
+		else if (FLT_OT_ARG_ISVALID(2)) {
+			for (i = 2; (i < pdata->args_max) && FLT_OT_ARG_ISVALID(i); i++)
+				if (strcmp(args[i], FLT_OT_PARSE_SPAN_ROOT) == 0) {
+					if (flt_ot_current_span->flag_root)
+						FLT_OT_PARSE_ERR(&err, "'%s' : already set (use '%s%s')", args[i], pdata->name, pdata->usage);
+					else
+						flt_ot_current_span->flag_root = 1;
+				}
+				else if ((strcmp(args[i], FLT_OT_PARSE_SPAN_REF_CHILD) == 0) || (strcmp(args[i], FLT_OT_PARSE_SPAN_REF_FOLLOWS) == 0)) {
+					if (!FLT_OT_ARG_ISVALID(i + 1)) {
+						FLT_OT_PARSE_ERR(&err, "'%s' : too few arguments (use '%s%s')", args[i], pdata->name, pdata->usage);
+					}
+					else if (strcmp(args[i++], FLT_OT_PARSE_SPAN_REF_CHILD) == 0) {
+						flt_ot_current_span->ref_type   = otc_span_reference_child_of;
+						flt_ot_current_span->ref_id_len = strlen(args[i]);
+
+						retval = flt_ot_parse_strdup(&(flt_ot_current_span->ref_id), args[i], &err, args[1]);
+					}
+					else {
+						flt_ot_current_span->ref_type   = otc_span_reference_follows_from;
+						flt_ot_current_span->ref_id_len = strlen(args[i]);
+
+						retval = flt_ot_parse_strdup(&(flt_ot_current_span->ref_id), args[i], &err, args[1]);
+					}
+				}
+				else {
+					FLT_OT_PARSE_ERR(&err, "'%s' : invalid argument (use '%s%s')", args[i], pdata->name, pdata->usage);
+				}
+		}
+		else {
+			/*
+			 * This is not a faulty configuration, only such a case
+			 * will be logged.
+			 */
+			FLT_OT_DBG(3, "new span '%s' without reference", flt_ot_current_span->id);
+		}
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_TAG) {
+		retval = flt_ot_parse_cfg_sample(file, linenum, args, &(flt_ot_current_span->tags), &err);
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_LOG) {
+		retval = flt_ot_parse_cfg_sample(file, linenum, args, &(flt_ot_current_span->logs), &err);
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_BAGGAGE) {
+		retval = flt_ot_parse_cfg_sample(file, linenum, args, &(flt_ot_current_span->baggages), &err);
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_INJECT) {
+		/*
+		 * Automatic context name generation can be specified here
+		 * if the contents of the FLT_OT_PARSE_CTX_AUTONAME macro
+		 * are used as the name.  In that case, if the context is
+		 * after a particular event, it gets its name; otherwise
+		 * it gets the name of the current span.
+		 */
+		if (flt_ot_current_span->ctx_id != NULL)
+			FLT_OT_PARSE_ERR(&err, "'%s' : only one context per span is allowed", args[1]);
+		else if (strcmp(args[1], FLT_OT_PARSE_CTX_AUTONAME) != 0)
+			retval = flt_ot_parse_strdup(&(flt_ot_current_span->ctx_id), args[1], &err, args[0]);
+		else if (flt_ot_current_scope->event != FLT_OT_EVENT_REQ_NONE)
+			retval = flt_ot_parse_strdup(&(flt_ot_current_span->ctx_id), flt_ot_event_data[flt_ot_current_scope->event].name, &err, args[0]);
+		else
+			retval = flt_ot_parse_strdup(&(flt_ot_current_span->ctx_id), flt_ot_current_span->id, &err, args[0]);
+
+		if (flt_ot_current_span->ctx_id != NULL) {
+			flt_ot_current_span->ctx_id_len = strlen(flt_ot_current_span->ctx_id);
+
+			/*
+			 * Here is checked the context storage type; which, if
+			 * not explicitly specified, is set to HTTP headers.
+			 *
+			 * It is possible to use both types of context storage
+			 * at the same time.
+			 */
+			if (FLT_OT_ARG_ISVALID(2)) {
+				retval = flt_ot_parse_cfg_scope_ctx(args, 2, &err);
+				if (!(retval & ERR_CODE) && FLT_OT_ARG_ISVALID(3))
+					retval = flt_ot_parse_cfg_scope_ctx(args, 3, &err);
+			} else {
+				flt_ot_current_span->ctx_flags = FLT_OT_CTX_USE_HEADERS;
+			}
+		}
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_EXTRACT) {
+		struct flt_ot_conf_context *conf_ctx;
+
+		/*
+		 * Here is checked the context storage type; which, if
+		 * not explicitly specified, is set to HTTP headers.
+		 */
+		conf_ctx = flt_ot_conf_context_init(args[1], linenum, &(flt_ot_current_scope->contexts), &err);
+		if (conf_ctx == NULL)
+			retval |= ERR_ABORT | ERR_ALERT;
+		else if (!FLT_OT_ARG_ISVALID(2))
+			conf_ctx->flags = FLT_OT_CTX_USE_HEADERS;
+		else if (strcmp(args[2], FLT_OT_PARSE_CTX_USE_HEADERS) == 0)
+			conf_ctx->flags = FLT_OT_CTX_USE_HEADERS;
+		else if (strcmp(args[2], FLT_OT_PARSE_CTX_USE_VARS) == 0)
+			conf_ctx->flags = FLT_OT_CTX_USE_VARS;
+		else
+			FLT_OT_PARSE_ERR(&err, "'%s' : invalid context storage type", args[2]);
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_FINISH) {
+		retval = flt_ot_parse_cfg_str(file, linenum, args, &(flt_ot_current_scope->finish), &err);
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_ACL) {
+		if (strcasecmp(args[1], "or") == 0)
+			FLT_OT_PARSE_ERR(&err, "'%s %s ...' : invalid ACL name", args[0], args[1]);
+		else if (parse_acl((const char **)args + 1, &(flt_ot_current_scope->acls), &err, &(flt_ot_current_config->proxy->conf.args), file, linenum) == NULL)
+			retval |= ERR_ABORT | ERR_ALERT;
+	}
+	else if (pdata->keyword == FLT_OT_PARSE_SCOPE_EVENT) {
+		/* Scope can only have one event defined. */
+		if (flt_ot_current_scope->event != FLT_OT_EVENT_REQ_NONE) {
+			FLT_OT_PARSE_ERR(&err, "'%s' : event already set", flt_ot_current_scope->id);
+		} else {
+			/* Check the event name. */
+			for (i = 0; i < FLT_OT_TABLESIZE(flt_ot_event_data); i++)
+				if (strcmp(flt_ot_event_data[i].name, args[1]) == 0) {
+					flt_ot_current_scope->event = i;
+
+					break;
+				}
+
+			/*
+			 * The event can have some condition defined and this
+			 * is checked here.
+			 */
+			if (flt_ot_current_scope->event == FLT_OT_EVENT_REQ_NONE) {
+				FLT_OT_PARSE_ERR(&err, "'%s' : unknown event", args[1]);
+			}
+			else if (!FLT_OT_ARG_ISVALID(2)) {
+				/* Do nothing. */
+			}
+			else if ((strcmp(args[2], FLT_OT_CONDITION_IF) == 0) || (strcmp(args[2], FLT_OT_CONDITION_UNLESS) == 0)) {
+				/*
+				 * We will first try to build ACL condition using
+				 * local settings and then if that fails, using
+				 * global settings (from tracer block).  If it
+				 * also fails, then try to use ACL defined in
+				 * the HAProxy configuration.
+				 */
+				flt_ot_current_scope->cond = flt_ot_parse_acl(file, linenum, flt_ot_current_config->proxy, (const char **)args + 2, &err, &(flt_ot_current_scope->acls), &(flt_ot_current_config->tracer->acls), &(flt_ot_current_config->proxy->acl), NULL);
+				if (flt_ot_current_scope->cond == NULL)
+					retval |= ERR_ABORT | ERR_ALERT;
+			}
+			else {
+				FLT_OT_PARSE_ERR(&err, "'%s' : expects either 'if' or 'unless' followed by a condition but found '%s'", args[1], args[2]);
+			}
+
+			if (!(retval & ERR_CODE))
+				FLT_OT_DBG(3, "event '%s'", args[1]);
+		}
+	}
+
+	FLT_OT_PARSE_IFERR_ALERT();
+
+	if ((retval & ERR_CODE) && (flt_ot_current_scope != NULL)) {
+		flt_ot_conf_scope_free(&flt_ot_current_scope);
+
+		flt_ot_current_span = NULL;
+	}
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_post_parse_cfg_scope -
+ *
+ * ARGUMENTS
+ *   This function takes no arguments.
+ *
+ * DESCRIPTION
+ *   In this function the correctness of the complete scope block is examined.
+ *   This does not mean that all elements are checked here, but only those for
+ *   which it has not been possible to establish their complete correctness in
+ *   the function flt_ot_parse_cfg_scope().
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_post_parse_cfg_scope(void)
+{
+	struct flt_ot_conf_span *conf_span;
+	int                      retval = ERR_NONE;
+
+	FLT_OT_FUNC("");
+
+	if (flt_ot_current_scope == NULL)
+		FLT_OT_RETURN(retval);
+
+	/* If span context inject is used, check that this is possible. */
+	list_for_each_entry(conf_span, &(flt_ot_current_scope->spans), list)
+		if ((conf_span->ctx_id != NULL) && (conf_span->ctx_flags & FLT_OT_CTX_USE_HEADERS))
+			if (!flt_ot_event_data[flt_ot_current_scope->event].flag_http_inject)
+				FLT_OT_POST_PARSE_ALERT("inject '%s' : cannot use on this event", conf_span->cfg_line, conf_span->ctx_id);
+
+	if (retval & ERR_CODE)
+		flt_ot_conf_scope_free(&flt_ot_current_scope);
+
+	flt_ot_current_scope = NULL;
+	flt_ot_current_span  = NULL;
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse_cfg -
+ *
+ * ARGUMENTS
+ *   conf     -
+ *   flt_name -
+ *   err      -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse_cfg(struct flt_ot_conf *conf, const char *flt_name, char **err)
+{
+	struct list backup_sections;
+	int         retval = ERR_ABORT | ERR_ALERT;
+
+	FLT_OT_FUNC("%p, \"%s\", %p:%p", conf, flt_name, FLT_OT_DPTR_ARGS(err));
+
+	flt_ot_current_config = conf;
+
+	/* Backup sections. */
+	LIST_INIT(&backup_sections);
+	cfg_backup_sections(&backup_sections);
+
+	/* Register new OT sections and parse the OT filter configuration file. */
+	if (!cfg_register_section(FLT_OT_PARSE_SECTION_TRACER_ID, flt_ot_parse_cfg_tracer, flt_ot_post_parse_cfg_tracer))
+		/* Do nothing. */;
+	else if (!cfg_register_section(FLT_OT_PARSE_SECTION_GROUP_ID, flt_ot_parse_cfg_group, flt_ot_post_parse_cfg_group))
+		/* Do nothing. */;
+	else if (!cfg_register_section(FLT_OT_PARSE_SECTION_SCOPE_ID, flt_ot_parse_cfg_scope, flt_ot_post_parse_cfg_scope))
+		/* Do nothing. */;
+	else if (access(conf->cfg_file, R_OK) == -1)
+		FLT_OT_PARSE_ERR(err, "'%s' : %s", conf->cfg_file, strerror(errno));
+	else
+		retval = readcfgfile(conf->cfg_file);
+
+	/* Unregister OT sections and restore previous sections. */
+	cfg_unregister_sections();
+	cfg_restore_sections(&backup_sections);
+
+	flt_ot_current_config = NULL;
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/***
+ * NAME
+ *   flt_ot_parse -
+ *
+ * ARGUMENTS
+ *   args    -
+ *   cur_arg -
+ *   px      -
+ *   fconf   -
+ *   err     -
+ *   private -
+ *
+ * DESCRIPTION
+ *   -
+ *
+ * RETURN VALUE
+ *   Returns ERR_NONE (== 0) in case of success,
+ *   or a combination of ERR_* flags if an error is encountered.
+ */
+static int flt_ot_parse(char **args, int *cur_arg, struct proxy *px, struct flt_conf *fconf, char **err, void *private)
+{
+	struct flt_ot_conf *conf = NULL;
+	int                 pos, retval = ERR_NONE;
+
+#ifdef DEBUG_OT
+	FLT_OT_RUN_ONCE(
+#  ifndef DEBUG_OT_SYSTIME
+		(void)memcpy(&(flt_ot_debug.start), &now, sizeof(flt_ot_debug.start));
+#  endif
+
+		flt_ot_debug.level = FLT_OT_DEBUG_LEVEL;
+	);
+#endif
+
+	FLT_OT_FUNC("%p, %p, %p, %p, %p:%p, %p", args, cur_arg, px, fconf, FLT_OT_DPTR_ARGS(err), private);
+
+#ifdef OTC_DBG_MEM
+	FLT_OT_RUN_ONCE(
+		if (otc_dbg_mem_init(&dbg_mem, dbg_mem_data, FLT_OT_TABLESIZE(dbg_mem_data), 0xff) == -1) {
+			FLT_OT_PARSE_ERR(err, "cannot initialize memory debugger");
+
+			FLT_OT_RETURN(retval);
+		}
+	);
+#endif
+
+	FLT_OT_ARGS_DUMP();
+
+	conf = flt_ot_conf_init(px);
+	if (conf == NULL) {
+		FLT_OT_PARSE_ERR(err, "'%s' : out of memory", args[*cur_arg]);
+
+		FLT_OT_RETURN(retval);
+	}
+
+	for (pos = *cur_arg + 1; !(retval & ERR_CODE) && FLT_OT_ARG_ISVALID(pos); pos++) {
+		FLT_OT_DBG(3, "args[%d:2] : { '%s' '%s' }", pos, args[pos], args[pos + 1]);
+
+		if (strcmp(args[pos], FLT_OT_OPT_FILTER_ID) == 0) {
+			retval = flt_ot_parse_keyword(&(conf->id), args, *cur_arg, pos, err, "name");
+			pos++;
+		}
+		else if (strcmp(args[pos], FLT_OT_OPT_CONFIG) == 0) {
+			retval = flt_ot_parse_keyword(&(conf->cfg_file), args, *cur_arg, pos, err, "configuration file");
+			if (!(retval & ERR_CODE))
+				retval = flt_ot_parse_cfg(conf, args[*cur_arg], err);
+			pos++;
+		}
+		else {
+			FLT_OT_PARSE_ERR(err, "'%s' : unknown keyword '%s'", args[*cur_arg], args[pos]);
+		}
+	}
+
+	/* If the OpenTracing filter ID is not set, use default name. */
+	if (!(retval & ERR_CODE) && (conf->id == NULL)) {
+		ha_warning("parsing : " FLT_OT_FMT_TYPE FLT_OT_FMT_NAME "'no filter id set, using default id '%s'\n", FLT_OT_OPT_FILTER_ID_DEFAULT);
+
+		retval = flt_ot_parse_strdup(&(conf->id), FLT_OT_OPT_FILTER_ID_DEFAULT, err, args[*cur_arg]);
+	}
+
+	if (!(retval & ERR_CODE) && (conf->cfg_file == NULL))
+		FLT_OT_PARSE_ERR(err, "'%s' : no configuration file specified", args[*cur_arg]);
+
+	if (retval & ERR_CODE) {
+		flt_ot_conf_free(&conf);
+	} else {
+		fconf->id   = ot_flt_id;
+		fconf->ops  = &flt_ot_ops;
+		fconf->conf = conf;
+
+		*cur_arg = pos;
+
+		FLT_OT_DBG(3, "filter set: id '%s', config '%s'", conf->id, conf->cfg_file);
+	}
+
+	FLT_OT_RETURN(retval);
+}
+
+
+/* Declare the filter parser for FLT_OT_OPT_NAME keyword. */
+static struct flt_kw_list flt_kws = { FLT_OT_SCOPE, { }, {
+		{ FLT_OT_OPT_NAME, flt_ot_parse, NULL },
+		{ NULL, NULL, NULL },
+	}
+};
+
+INITCALL1(STG_REGISTER, flt_register_keywords, &flt_kws);
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ *
+ * vi: noexpandtab shiftwidth=8 tabstop=8
+ */