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Fixed parsing of absolute URIs with empty path (ticket #2079).

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When the request line contains request-target in the absolute-URI form,
it can contain path-empty instead of a single slash (see RFC 7230, RFC 3986).
Previously, the ngx_http_parse_request_line() function only accepted empty
path when there was no query string.

With this change, non-empty query is also correctly handled.  That is,
request line "GET http://example.com?foo HTTP/1.1" is accepted and results
in $uri "/" and $args "foo".

Note that $request_uri remains "?foo", similarly to how spaces in URIs
are handled.  Providing "/?foo", similarly to how "/" is provided for
"GET http://example.com HTTP/1.1", requires allocation.
This commit is contained in:
Maxim Dounin 2020-12-10 20:09:30 +03:00
parent e62a5132ca
commit ce9971b2b5
3 changed files with 26 additions and 2 deletions
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17
src/http/ngx_http_parse.c
View File

@ -380,6 +380,12 @@ ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b)
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
case '?':
r->uri_start = p;
r->args_start = p + 1;
r->empty_path_in_uri = 1;
state = sw_uri;
break;
case ' ':
/*
* use single "/" from request line to preserve pointers,
@ -446,6 +452,13 @@ ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b)
r->uri_start = p;
state = sw_after_slash_in_uri;
break;
case '?':
r->port_end = p;
r->uri_start = p;
r->args_start = p + 1;
r->empty_path_in_uri = 1;
state = sw_uri;
break;
case ' ':
r->port_end = p;
/*
@ -1287,6 +1300,10 @@ ngx_http_parse_complex_uri(ngx_http_request_t *r, ngx_uint_t merge_slashes)
r->uri_ext = NULL;
r->args_start = NULL;
if (r->empty_path_in_uri) {
*u++ = '/';
}
ch = *p++;
while (p <= r->uri_end) {

8
src/http/ngx_http_request.c
View File

@ -1224,7 +1224,11 @@ ngx_http_process_request_uri(ngx_http_request_t *r)
r->uri.len = r->uri_end - r->uri_start;
}
if (r->complex_uri || r->quoted_uri) {
if (r->complex_uri || r->quoted_uri || r->empty_path_in_uri) {
if (r->empty_path_in_uri) {
r->uri.len++;
}
r->uri.data = ngx_pnalloc(r->pool, r->uri.len + 1);
if (r->uri.data == NULL) {
@ -1250,7 +1254,7 @@ ngx_http_process_request_uri(ngx_http_request_t *r)
r->unparsed_uri.len = r->uri_end - r->uri_start;
r->unparsed_uri.data = r->uri_start;
r->valid_unparsed_uri = r->space_in_uri ? 0 : 1;
r->valid_unparsed_uri = (r->space_in_uri || r->empty_path_in_uri) ? 0 : 1;
if (r->uri_ext) {
if (r->args_start) {

3
src/http/ngx_http_request.h
View File

@ -470,6 +470,9 @@ struct ngx_http_request_s {
/* URI with " " */
unsigned space_in_uri:1;
/* URI with empty path */
unsigned empty_path_in_uri:1;
unsigned invalid_header:1;
unsigned add_uri_to_alias:1;