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Inspect Accept-Charset header
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1 parent c00cd7a commit ce3efa0f853e62ee03f500515cc412b49d5b85bc
@Andreas Jaggi Andreas Jaggi authored on 31 Aug 2011
x-way committed on 31 Aug 2011
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 README
 
Limitations
Currently only inspects the following headers: Range, If-Range,
If-Unmodified-Since, If-Modified-Since, Date, Accept-Encoding,
Accept-Language
Accept-Language, Accept-Charset
 
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Create a ticket on the issue tracking interface of GitHub:
http://github.com/x-way/ngx_http_header_inspect/issues
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 ngx_http_header_inspect.c
static ngx_int_t ngx_header_inspect_entity_tag(u_char *data, ngx_uint_t maxlen);
static ngx_int_t ngx_header_inspect_range_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, ngx_str_t value);
static ngx_int_t ngx_header_inspect_acceptencoding_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, ngx_str_t value);
static ngx_int_t ngx_header_inspect_acceptlanguage_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, ngx_str_t value);
static ngx_int_t ngx_header_inspect_acceptcharset_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, ngx_str_t value);
static ngx_int_t ngx_header_inspect_ifrange_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, ngx_str_t value);
static ngx_int_t ngx_header_inspect_date_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, char *header, ngx_str_t value);
static ngx_int_t ngx_header_inspect_process_request(ngx_http_request_t *r);
 
 
return NGX_OK;
}
 
static ngx_int_t ngx_header_inspect_parse_charset(u_char *data, ngx_uint_t maxlen, ngx_uint_t *len) {
ngx_uint_t i;
u_char d;
ngx_uint_t alphacount = 0;
 
if (maxlen < 1) {
*len = 0;
return NGX_ERROR;
}
 
if (data[0] == '*') {
*len = 1;
return NGX_OK;
}
 
*len = 1;
for ( i = 0; i < maxlen; i++ ) {
d = data[i];
if (
(d == '-') ||
(d == '_') ||
(d == '+') ||
(d == '.') ||
(d == ':')
) {
if (alphacount == 0) {
*len = i;
return NGX_ERROR;
}
alphacount = 0;
continue;
}
if (
((d < '0') || (d > '9')) &&
((d < 'a') || (d > 'z')) &&
((d < 'A') || (d > 'Z'))
) {
*len = i;
if (alphacount == 0) {
return NGX_ERROR;
} else {
return NGX_OK;
}
}
alphacount++;
}
 
*len = i;
if (alphacount == 0) {
return NGX_ERROR;
} else {
return NGX_OK;
}
}
 
static ngx_int_t ngx_header_inspect_parse_languagerange(u_char *data, ngx_uint_t maxlen, ngx_uint_t *len) {
ngx_uint_t i;
u_char d;
ngx_uint_t alphacount = 0;
return NGX_ERROR;
} else {
return NGX_OK;
}
}
 
static ngx_int_t ngx_header_inspect_acceptcharset_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, ngx_str_t value) {
ngx_int_t rc = NGX_AGAIN;
ngx_uint_t i = 0;
ngx_uint_t v;
 
if ((value.len == 0) || ((value.len == 1) && (value.data[0] == '*'))) {
return NGX_OK;
}
 
while ( i < value.len ) {
if (ngx_header_inspect_parse_charset(&(value.data[i]), value.len-i, &v) != NGX_OK) {
ngx_log_error(NGX_LOG_ALERT, log, 0, "header_inspect: invalid charset at position %d in Accept-Charset header \"%s\"", i, value.data);
rc = NGX_ERROR;
break;
}
i += v;
if ((value.data[i] == ' ') && (i < value.len)) {
i++;
}
if (i == value.len) {
rc = NGX_OK;
break;
}
if (value.data[i] == ';') {
i++;
if (i >= value.len) {
ngx_log_error(NGX_LOG_ALERT, log, 0, "header_inspect: unexpected end of Accept-Charset header \"%s\"", value.data);
rc = NGX_ERROR;
break;
}
if ((value.data[i] == ' ') && (i < value.len)) {
i++;
}
if (ngx_header_inspect_parse_qvalue(&(value.data[i]), value.len-i, &v) != NGX_OK) {
ngx_log_error(NGX_LOG_ALERT, log, 0, "header_inspect: invalid qvalue at position %d in Accept-Charset header \"%s\"", i, value.data);
rc = NGX_ERROR;
break;
}
i += v;
if ((value.data[i] == ' ') && (i < value.len)) {
i++;
}
if (i == value.len) {
rc = NGX_OK;
break;
}
}
if (value.data[i] != ',') {
ngx_log_error(NGX_LOG_ALERT, log, 0, "header_inspect: illegal char at position %d in Accept-Charset header \"%s\"", i, value.data);
rc = NGX_ERROR;
break;
}
i++;
if ((value.data[i] == ' ') && (i < value.len)) {
i++;
}
}
 
if (rc == NGX_AGAIN) {
ngx_log_error(NGX_LOG_ALERT, log, 0, "header_inspect: unexpected end of Accept-Charset header \"%s\"", value.data);
rc = NGX_ERROR;
}
 
return rc;
}
 
static ngx_int_t ngx_header_inspect_acceptlanguage_header(ngx_header_inspect_loc_conf_t *conf, ngx_log_t *log, ngx_str_t value) {
ngx_int_t rc = NGX_AGAIN;
rc = ngx_header_inspect_acceptlanguage_header(conf, r->connection->log, h[i].value);
if ((rc != NGX_OK) && conf->block) {
return NGX_HTTP_BAD_REQUEST;
}
} else if ((h[i].key.len == 14) && (ngx_strcmp("Accept-Charset", h[i].key.data) == 0) ) {
rc = ngx_header_inspect_acceptcharset_header(conf, r->connection->log, h[i].value);
if ((rc != NGX_OK) && conf->block) {
return NGX_HTTP_BAD_REQUEST;
}
} else {
/* TODO: support for other headers */
if (conf->log_uninspected) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "header_inspect: uninspected header \"%s: %s\"", h[i].key.data, h[i].value.data);