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fix a parsing error.
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pei-jikui committed Apr 13, 2021
1 parent 240f1d8 commit b598cce
Showing 1 changed file with 64 additions and 87 deletions.
151 changes: 64 additions & 87 deletions src/http/modules/ngx_http_rewrite_module.c
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Original file line number Diff line number Diff line change
Expand Up @@ -950,116 +950,94 @@ ngx_http_rewrite_parse_if_condition(ngx_conf_t *cf,
ngx_str_t *value, ngx_uint_t begin, ngx_uint_t last)
{
ngx_uint_t index,ori_index;
ngx_http_rewrite_if_operator_t operator = {};
ngx_http_rewrite_if_operator_t operator={};
char * rv = NGX_CONF_OK;
ngx_http_script_if_op_e op_type = ngx_http_script_if_invalid;
ngx_http_script_if_op_e op_type, pre_op_type= ngx_http_script_if_invalid;
ngx_http_script_if_operator_code_t *operator_code;

/*find the matching )*/
if (value[begin].data[0] == '(') {
rv = ngx_http_rewrite_if_match_bracket(value, begin, last, &index);
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"find match bracket error.");
return rv;
}
ori_index = index;
if (value[begin].len == 1) {
begin++;
} else {
value[begin].len--;
value[begin].data++;
}
if (value[index].len == 1) {
index--;
} else {
value[index].data[value[index].len] = '\0';
value[index].len--;
}
/*The matching bracket is at the end of the tokens*/
rv = ngx_http_rewrite_parse_if_condition(cf, lcf, value, begin, index);
/*if op_type has validate value, then add the opcode*/
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"find parse if condition error.");
return rv;
}
if (begin > last) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"parse if condition index error. begin %d last %d.",
begin, last);
return NGX_CONF_ERROR;
}

index = ori_index;
if (index == last) {
return rv;
} else if (index < last - 2){
/*still have some tokens left.*/
/*The first one after index must be operator*/
op_type = ngx_http_rewrite_if_check_operator(&value[index + 1]);
if (op_type == ngx_http_script_if_invalid) {
while(begin <= last) {
/*find the matching )*/
if (value[begin].data[0] == '(') {
rv = ngx_http_rewrite_if_match_bracket(value, begin, last, &index);
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"two subconditions are adjacent without logic operator.");
return NGX_CONF_ERROR;
"find match bracket error.");
return rv;
}
ori_index = index;
if (value[begin].len == 1) {
begin++;
} else {
value[begin].len--;
value[begin].data++;
}
begin = index + 2;
rv = ngx_http_rewrite_parse_if_condition(cf, lcf, value, begin, last);
if (value[index].len == 1) {
index--;
} else {
value[index].data[value[index].len] = '\0';
value[index].len--;
}
/*The matching bracket is at the end of the tokens*/
rv = ngx_http_rewrite_parse_if_condition(cf, lcf, value, begin, index);
/*if op_type has validate value, then add the opcode*/
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"find parse if condition error.");
return rv;
}
operator.op_type = op_type;
operator.op_index = index;
/*add the operator operation here.*/
operator_code = ngx_array_push_n(lcf->codes,
sizeof(ngx_http_script_if_operator_code_t));
operator_code->code = ngx_http_script_if_operator_code;
operator_code->op = op_type;
op_type = operator.op_type;
return rv;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"if conditions parsing error.");
return NGX_CONF_ERROR;
}
} else {
/*Find the index of the operator*/
rv = ngx_http_rewrite_find_if_logic_operator(value, begin,
last, &operator);
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"internal if logic operator finding error.");
return rv;
}

/*no any opeators anymore*/
if (operator.op_type == ngx_http_script_if_invalid){
rv = ngx_http_rewrite_if_logic_item(cf, lcf, begin, last);
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"internal if logic subcondition parsing error.");
begin = ori_index;

if (ori_index < last ){
/*still have some tokens left.*/
/*The first one after index must be operator*/
op_type = ngx_http_rewrite_if_check_operator(&value[ori_index + 1]);
if (op_type == ngx_http_script_if_invalid) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"two subconditions are adjacent without logic operator.");
return NGX_CONF_ERROR;
}
operator.op_type = op_type;
operator.op_index = ori_index + 1;
}
return rv;

begin = begin + 2;
} else {
/*find the operator*/
rv = ngx_http_rewrite_if_logic_item(cf, lcf, begin, operator.op_index - 1);
/*Find the index of the operator*/
rv = ngx_http_rewrite_find_if_logic_operator(value, begin,
last, &operator);
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"internal if logic subcondition parsing error.");
"internal if logic operator finding error.");
return rv;
}
begin = operator.op_index + 1;
rv = ngx_http_rewrite_parse_if_condition(cf, lcf, value, begin, last);

/*no any opeators anymore*/
if (operator.op_type == ngx_http_script_if_invalid){
rv = ngx_http_rewrite_if_logic_item(cf, lcf, begin, last);
begin = last + 1;
} else {
rv = ngx_http_rewrite_if_logic_item(cf, lcf, begin, operator.op_index - 1);
begin = operator.op_index + 1;
}
if (rv != NGX_CONF_OK) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"internal if logic subcondition parsing error.");
return rv;
}
/*add the operator operation here.*/
}

if (pre_op_type != ngx_http_script_if_invalid) {
operator_code = ngx_array_push_n(lcf->codes,
sizeof(ngx_http_script_if_operator_code_t));
operator_code->code = ngx_http_script_if_operator_code;
operator_code->op = operator.op_type;
return rv;
operator_code->op = op_type;
}

pre_op_type = operator.op_type;
}

return rv;
Expand All @@ -1078,7 +1056,7 @@ ngx_http_rewrite_if_condition(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf)

if (value[begin].len < 1 || value[begin].data[0] != '(') {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid condition \"%V\"", &value[begin]);
"invalid condition \"%V\"", &value[begin]);
return NGX_CONF_ERROR;
}

Expand All @@ -1104,7 +1082,6 @@ ngx_http_rewrite_if_condition(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf)
value[last].len--;
value[last].data[value[last].len] = '\0';
}

rv = ngx_http_rewrite_parse_if_condition(cf, lcf, value, begin, last);

return rv;
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