mirror of
https://github.com/nginx/nginx.git
synced 2024-12-16 14:19:00 +08:00
02f742b45e
*) Bugfix: nginx hogs CPU while proxying the huge files.
*) Bugfix: nginx could not be built by gcc 4.0 on Linux.
1004 lines
24 KiB
C
1004 lines
24 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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ngx_int_t ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b)
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{
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u_char c, ch, *p, *m;
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enum {
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sw_start = 0,
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sw_method,
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sw_space_after_method,
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sw_spaces_before_uri,
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sw_schema,
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sw_schema_slash,
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sw_schema_slash_slash,
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sw_host,
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sw_port,
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sw_after_slash_in_uri,
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sw_check_uri,
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sw_uri,
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sw_http_09,
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sw_http_H,
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sw_http_HT,
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sw_http_HTT,
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sw_http_HTTP,
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sw_first_major_digit,
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sw_major_digit,
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sw_first_minor_digit,
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sw_minor_digit,
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sw_almost_done
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} state;
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state = r->state;
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for (p = b->pos; p < b->last; p++) {
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ch = *p;
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/* gcc 2.95.2 and msvc 6.0 compile this switch as an jump table */
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switch (state) {
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/* HTTP methods: GET, HEAD, POST */
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case sw_start:
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r->request_start = p;
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if (ch == CR || ch == LF) {
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break;
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}
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if (ch < 'A' || ch > 'Z') {
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return NGX_HTTP_PARSE_INVALID_METHOD;
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}
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state = sw_method;
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break;
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case sw_method:
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if (ch == ' ') {
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r->method_end = p;
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m = r->request_start;
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if (p - m == 3) {
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if (m[0] == 'G' && m[1] == 'E' && m[2] == 'T') {
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r->method = NGX_HTTP_GET;
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}
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} else if (p - m == 4) {
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if (m[0] == 'P' && m[1] == 'O'
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&& m[2] == 'S' && m[3] == 'T')
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{
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r->method = NGX_HTTP_POST;
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} else if (m[0] == 'H' && m[1] == 'E'
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&& m[2] == 'A' && m[3] == 'D')
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{
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r->method = NGX_HTTP_HEAD;
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}
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}
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state = sw_spaces_before_uri;
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break;
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}
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if (ch < 'A' || ch > 'Z') {
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return NGX_HTTP_PARSE_INVALID_METHOD;
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}
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break;
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/* single space after method */
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case sw_space_after_method:
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switch (ch) {
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case ' ':
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state = sw_spaces_before_uri;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_METHOD;
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}
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break;
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/* space* before URI */
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case sw_spaces_before_uri:
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c = (u_char) (ch | 0x20);
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if (c >= 'a' && c <= 'f') {
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r->schema_start = p;
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state = sw_schema;
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break;
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}
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switch (ch) {
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case '/':
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r->uri_start = p;
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state = sw_after_slash_in_uri;
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break;
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case ' ':
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_schema:
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c = (u_char) (ch | 0x20);
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if (c >= 'a' && c <= 'f') {
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break;
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}
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switch (ch) {
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case ':':
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r->schema_end = p;
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state = sw_schema_slash;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_schema_slash:
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switch (ch) {
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case '/':
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state = sw_schema_slash_slash;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_schema_slash_slash:
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switch (ch) {
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case '/':
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r->host_start = p;
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state = sw_host;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_host:
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c = (u_char) (ch | 0x20);
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if (c >= 'a' && c <= 'f') {
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break;
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}
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if ((ch >= '0' && ch <= '9') || ch == '.' || ch == '-')
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{
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break;
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}
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switch (ch) {
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case ':':
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r->host_end = p;
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state = sw_port;
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break;
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case '/':
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r->host_end = p;
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r->uri_start = p;
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state = sw_after_slash_in_uri;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_port:
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if (ch >= '0' && ch <= '9') {
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break;
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}
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switch (ch) {
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case '/':
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r->port_end = p;
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r->uri_start = p;
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state = sw_after_slash_in_uri;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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/* check "/.", "//", "%", and "\" (Win32) in URI */
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case sw_after_slash_in_uri:
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c = (u_char) (ch | 0x20);
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if (c >= 'a' && c <= 'f') {
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state = sw_check_uri;
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break;
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}
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if (ch >= '0' && ch <= '9') {
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state = sw_check_uri;
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break;
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}
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switch (ch) {
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case ' ':
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r->uri_end = p;
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state = sw_http_09;
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break;
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case CR:
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r->uri_end = p;
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r->http_minor = 9;
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state = sw_almost_done;
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break;
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case LF:
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r->uri_end = p;
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r->http_minor = 9;
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goto done;
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case '.':
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r->complex_uri = 1;
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state = sw_uri;
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break;
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case '%':
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r->quoted_uri = 1;
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state = sw_uri;
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break;
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case '/':
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r->complex_uri = 1;
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state = sw_uri;
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break;
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#if (NGX_WIN32)
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case '\\':
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r->complex_uri = 1;
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state = sw_uri;
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break;
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#endif
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case '?':
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r->args_start = p + 1;
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state = sw_uri;
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break;
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case '+':
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r->plus_in_uri = 1;
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break;
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case '\0':
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r->zero_in_uri = 1;
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break;
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default:
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state = sw_check_uri;
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break;
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}
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break;
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/* check "/", "%" and "\" (Win32) in URI */
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case sw_check_uri:
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c = (u_char) (ch | 0x20);
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if (c >= 'a' && c <= 'f') {
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break;
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}
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if (ch >= '0' && ch <= '9') {
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break;
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}
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switch (ch) {
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case '/':
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r->uri_ext = NULL;
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state = sw_after_slash_in_uri;
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break;
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case '.':
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r->uri_ext = p + 1;
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break;
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case ' ':
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r->uri_end = p;
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state = sw_http_09;
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break;
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case CR:
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r->uri_end = p;
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r->http_minor = 9;
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state = sw_almost_done;
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break;
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case LF:
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r->uri_end = p;
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r->http_minor = 9;
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goto done;
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#if (NGX_WIN32)
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case '\\':
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r->complex_uri = 1;
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state = sw_after_slash_in_uri;
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break;
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#endif
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case '%':
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r->quoted_uri = 1;
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state = sw_uri;
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break;
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case '+':
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r->plus_in_uri = 1;
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break;
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case '?':
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r->args_start = p + 1;
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state = sw_uri;
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break;
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case '\0':
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r->zero_in_uri = 1;
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break;
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}
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break;
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/* URI */
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case sw_uri:
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switch (ch) {
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case ' ':
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r->uri_end = p;
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state = sw_http_09;
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break;
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case CR:
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r->uri_end = p;
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r->http_minor = 9;
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state = sw_almost_done;
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break;
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case LF:
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r->uri_end = p;
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r->http_minor = 9;
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goto done;
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case '+':
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r->plus_in_uri = 1;
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break;
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case '\0':
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r->zero_in_uri = 1;
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break;
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}
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break;
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/* space+ after URI */
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case sw_http_09:
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switch (ch) {
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case ' ':
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break;
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case CR:
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r->http_minor = 9;
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state = sw_almost_done;
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break;
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case LF:
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r->http_minor = 9;
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goto done;
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case 'H':
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r->http_protocol.data = p;
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state = sw_http_H;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_http_H:
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switch (ch) {
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case 'T':
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state = sw_http_HT;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_http_HT:
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switch (ch) {
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case 'T':
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state = sw_http_HTT;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_http_HTT:
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switch (ch) {
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case 'P':
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state = sw_http_HTTP;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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case sw_http_HTTP:
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switch (ch) {
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case '/':
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state = sw_first_major_digit;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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break;
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/* first digit of major HTTP version */
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case sw_first_major_digit:
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if (ch < '1' || ch > '9') {
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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r->http_major = ch - '0';
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state = sw_major_digit;
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break;
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/* major HTTP version or dot */
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case sw_major_digit:
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if (ch == '.') {
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state = sw_first_minor_digit;
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break;
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}
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if (ch < '0' || ch > '9') {
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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r->http_major = r->http_major * 10 + ch - '0';
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break;
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/* first digit of minor HTTP version */
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case sw_first_minor_digit:
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if (ch < '0' || ch > '9') {
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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r->http_minor = ch - '0';
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state = sw_minor_digit;
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break;
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/* minor HTTP version or end of request line */
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case sw_minor_digit:
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if (ch == CR) {
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state = sw_almost_done;
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break;
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}
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if (ch == LF) {
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goto done;
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}
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if (ch < '0' || ch > '9') {
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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r->http_minor = r->http_minor * 10 + ch - '0';
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break;
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/* end of request line */
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case sw_almost_done:
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r->request_end = p - 1;
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switch (ch) {
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case LF:
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goto done;
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default:
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return NGX_HTTP_PARSE_INVALID_REQUEST;
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}
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}
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}
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b->pos = p;
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r->state = state;
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return NGX_AGAIN;
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done:
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b->pos = p + 1;
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if (r->request_end == NULL) {
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r->request_end = p;
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}
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r->http_version = r->http_major * 1000 + r->http_minor;
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r->state = sw_start;
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if (r->http_version == 9 && r->method != NGX_HTTP_GET) {
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return NGX_HTTP_PARSE_INVALID_09_METHOD;
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}
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return NGX_OK;
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}
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ngx_int_t ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b)
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{
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u_char c, ch, *p;
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ngx_uint_t hash;
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enum {
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sw_start = 0,
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sw_name,
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sw_space_before_value,
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sw_value,
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sw_space_after_value,
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sw_ignore_line,
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sw_skip_line,
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sw_almost_done,
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sw_header_almost_done
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} state;
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state = r->state;
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hash = r->header_hash;
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for (p = b->pos; p < b->last; p++) {
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ch = *p;
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switch (state) {
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/* first char */
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case sw_start:
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r->invalid_header = 0;
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switch (ch) {
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case CR:
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r->header_end = p;
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state = sw_header_almost_done;
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break;
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case LF:
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r->header_end = p;
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goto header_done;
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default:
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state = sw_name;
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r->header_name_start = p;
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c = (u_char) (ch | 0x20);
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if (c >= 'a' && c <= 'z') {
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hash = c;
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break;
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}
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if (ch == '-') {
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hash = ch;
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break;
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}
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if (ch >= '0' && ch <= '9') {
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hash = ch;
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break;
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}
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r->invalid_header = 1;
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state = sw_skip_line;
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break;
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}
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break;
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/* header name */
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case sw_name:
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c = (u_char) (ch | 0x20);
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if (c >= 'a' && c <= 'z') {
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hash += c;
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break;
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}
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if (ch == ':') {
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r->header_name_end = p;
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state = sw_space_before_value;
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break;
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}
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if (ch == '-') {
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hash += ch;
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break;
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}
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if (ch >= '0' && ch <= '9') {
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hash += ch;
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break;
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}
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/* IIS may send the duplicate "HTTP/1.1 ..." lines */
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if (ch == '/'
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&& r->proxy
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&& p - r->header_start == 4
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&& ngx_strncmp(r->header_start, "HTTP", 4) == 0)
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{
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state = sw_ignore_line;
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break;
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}
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r->invalid_header = 1;
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state = sw_skip_line;
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break;
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/* space* before header value */
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case sw_space_before_value:
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switch (ch) {
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case ' ':
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break;
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case CR:
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r->header_start = r->header_end = p;
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state = sw_almost_done;
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break;
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case LF:
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r->header_start = r->header_end = p;
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goto done;
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default:
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r->header_start = p;
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state = sw_value;
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break;
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}
|
|
break;
|
|
|
|
/* header value */
|
|
case sw_value:
|
|
switch (ch) {
|
|
case ' ':
|
|
r->header_end = p;
|
|
state = sw_space_after_value;
|
|
break;
|
|
case CR:
|
|
r->header_end = p;
|
|
state = sw_almost_done;
|
|
break;
|
|
case LF:
|
|
r->header_end = p;
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
/* space* before end of header line */
|
|
case sw_space_after_value:
|
|
switch (ch) {
|
|
case ' ':
|
|
break;
|
|
case CR:
|
|
state = sw_almost_done;
|
|
break;
|
|
case LF:
|
|
goto done;
|
|
default:
|
|
state = sw_value;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
/* ignore header line */
|
|
case sw_ignore_line:
|
|
switch (ch) {
|
|
case LF:
|
|
state = sw_start;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
/* skip header line */
|
|
case sw_skip_line:
|
|
switch (ch) {
|
|
case CR:
|
|
r->header_end = p;
|
|
state = sw_almost_done;
|
|
break;
|
|
case LF:
|
|
r->header_end = p;
|
|
goto done;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
/* end of header line */
|
|
case sw_almost_done:
|
|
switch (ch) {
|
|
case LF:
|
|
goto done;
|
|
default:
|
|
return NGX_HTTP_PARSE_INVALID_HEADER;
|
|
}
|
|
|
|
/* end of header */
|
|
case sw_header_almost_done:
|
|
switch (ch) {
|
|
case LF:
|
|
goto header_done;
|
|
default:
|
|
return NGX_HTTP_PARSE_INVALID_HEADER;
|
|
}
|
|
}
|
|
}
|
|
|
|
b->pos = p;
|
|
r->state = state;
|
|
r->header_hash = hash;
|
|
|
|
return NGX_AGAIN;
|
|
|
|
done:
|
|
|
|
b->pos = p + 1;
|
|
r->state = sw_start;
|
|
r->header_hash = hash;
|
|
|
|
return NGX_OK;
|
|
|
|
header_done:
|
|
|
|
b->pos = p + 1;
|
|
r->state = sw_start;
|
|
|
|
return NGX_HTTP_PARSE_HEADER_DONE;
|
|
}
|
|
|
|
|
|
ngx_int_t ngx_http_parse_complex_uri(ngx_http_request_t *r)
|
|
{
|
|
u_char c, ch, decoded, *p, *u;
|
|
enum {
|
|
sw_usual = 0,
|
|
sw_slash,
|
|
sw_dot,
|
|
sw_dot_dot,
|
|
#if (NGX_WIN32)
|
|
sw_dot_dot_dot,
|
|
#endif
|
|
sw_quoted,
|
|
sw_quoted_second
|
|
} state, quoted_state;
|
|
|
|
#if (NGX_SUPPRESS_WARN)
|
|
decoded = '\0';
|
|
quoted_state = sw_usual;
|
|
#endif
|
|
|
|
state = sw_usual;
|
|
p = r->uri_start;
|
|
u = r->uri.data;
|
|
r->uri_ext = NULL;
|
|
r->args_start = NULL;
|
|
|
|
ch = *p++;
|
|
|
|
while (p <= r->uri_end) {
|
|
|
|
/*
|
|
* we use "ch = *p++" inside the cycle, but this operation is safe,
|
|
* because after the URI there is always at least one charcter:
|
|
* the line feed
|
|
*/
|
|
|
|
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
"s:%d in:'%Xd:%c', out:'%c'", state, ch, ch, *u);
|
|
|
|
switch (state) {
|
|
case sw_usual:
|
|
switch(ch) {
|
|
#if (NGX_WIN32)
|
|
case '\\':
|
|
r->uri_ext = NULL;
|
|
|
|
if (p == r->uri_start + r->uri.len) {
|
|
|
|
/*
|
|
* we omit the last "\" to cause redirect because
|
|
* the browsers do not treat "\" as "/" in relative URL path
|
|
*/
|
|
|
|
break;
|
|
}
|
|
|
|
state = sw_slash;
|
|
*u++ = '/';
|
|
break;
|
|
#endif
|
|
case '/':
|
|
r->uri_ext = NULL;
|
|
state = sw_slash;
|
|
*u++ = ch;
|
|
break;
|
|
case '%':
|
|
quoted_state = state;
|
|
state = sw_quoted;
|
|
break;
|
|
case '?':
|
|
r->args_start = p;
|
|
goto done;
|
|
case '.':
|
|
r->uri_ext = u + 1;
|
|
*u++ = ch;
|
|
break;
|
|
default:
|
|
*u++ = ch;
|
|
break;
|
|
}
|
|
ch = *p++;
|
|
break;
|
|
|
|
case sw_slash:
|
|
switch(ch) {
|
|
#if (NGX_WIN32)
|
|
case '\\':
|
|
break;
|
|
#endif
|
|
case '/':
|
|
break;
|
|
case '.':
|
|
state = sw_dot;
|
|
*u++ = ch;
|
|
break;
|
|
case '%':
|
|
quoted_state = state;
|
|
state = sw_quoted;
|
|
break;
|
|
case '?':
|
|
r->args_start = p;
|
|
goto done;
|
|
default:
|
|
state = sw_usual;
|
|
*u++ = ch;
|
|
break;
|
|
}
|
|
ch = *p++;
|
|
break;
|
|
|
|
case sw_dot:
|
|
switch(ch) {
|
|
#if (NGX_WIN32)
|
|
case '\\':
|
|
/* fall through */
|
|
#endif
|
|
case '/':
|
|
state = sw_slash;
|
|
u--;
|
|
break;
|
|
case '.':
|
|
state = sw_dot_dot;
|
|
*u++ = ch;
|
|
break;
|
|
case '%':
|
|
quoted_state = state;
|
|
state = sw_quoted;
|
|
break;
|
|
case '?':
|
|
r->args_start = p;
|
|
goto done;
|
|
default:
|
|
state = sw_usual;
|
|
*u++ = ch;
|
|
break;
|
|
}
|
|
ch = *p++;
|
|
break;
|
|
|
|
case sw_dot_dot:
|
|
switch(ch) {
|
|
#if (NGX_WIN32)
|
|
case '\\':
|
|
/* fall through */
|
|
#endif
|
|
case '/':
|
|
state = sw_slash;
|
|
u -= 4;
|
|
if (u < r->uri.data) {
|
|
return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
}
|
|
while (*(u - 1) != '/') {
|
|
u--;
|
|
}
|
|
break;
|
|
case '%':
|
|
quoted_state = state;
|
|
state = sw_quoted;
|
|
break;
|
|
case '?':
|
|
r->args_start = p;
|
|
goto done;
|
|
#if (NGX_WIN32)
|
|
case '.':
|
|
state = sw_dot_dot_dot;
|
|
*u++ = ch;
|
|
break;
|
|
#endif
|
|
default:
|
|
state = sw_usual;
|
|
*u++ = ch;
|
|
break;
|
|
}
|
|
ch = *p++;
|
|
break;
|
|
|
|
#if (NGX_WIN32)
|
|
case sw_dot_dot_dot:
|
|
switch(ch) {
|
|
case '\\':
|
|
case '/':
|
|
state = sw_slash;
|
|
u -= 5;
|
|
if (u < r->uri.data) {
|
|
return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
}
|
|
while (*u != '/') {
|
|
u--;
|
|
}
|
|
if (u < r->uri.data) {
|
|
return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
}
|
|
while (*(u - 1) != '/') {
|
|
u--;
|
|
}
|
|
break;
|
|
case '%':
|
|
quoted_state = state;
|
|
state = sw_quoted;
|
|
break;
|
|
default:
|
|
state = sw_usual;
|
|
*u++ = ch;
|
|
break;
|
|
}
|
|
ch = *p++;
|
|
break;
|
|
#endif
|
|
|
|
case sw_quoted:
|
|
if (ch >= '0' && ch <= '9') {
|
|
decoded = (u_char) (ch - '0');
|
|
state = sw_quoted_second;
|
|
ch = *p++;
|
|
break;
|
|
}
|
|
|
|
c = (u_char) (ch | 0x20);
|
|
if (c >= 'a' && c <= 'f') {
|
|
decoded = (u_char) (c - 'a' + 10);
|
|
state = sw_quoted_second;
|
|
ch = *p++;
|
|
break;
|
|
}
|
|
|
|
return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
|
|
case sw_quoted_second:
|
|
if (ch >= '0' && ch <= '9') {
|
|
ch = (u_char) ((decoded << 4) + ch - '0');
|
|
|
|
if (ch == '%') {
|
|
state = sw_usual;
|
|
*u++ = ch;
|
|
ch = *p++;
|
|
break;
|
|
}
|
|
|
|
if (ch == '\0') {
|
|
r->zero_in_uri = 1;
|
|
*u++ = ch;
|
|
ch = *p++;
|
|
}
|
|
|
|
state = quoted_state;
|
|
break;
|
|
}
|
|
|
|
c = (u_char) (ch | 0x20);
|
|
if (c >= 'a' && c <= 'f') {
|
|
ch = (u_char) ((decoded << 4) + c - 'a' + 10);
|
|
if (ch == '?') {
|
|
*u++ = ch;
|
|
ch = *p++;
|
|
}
|
|
state = quoted_state;
|
|
break;
|
|
}
|
|
|
|
return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
}
|
|
}
|
|
|
|
done:
|
|
|
|
r->uri.len = u - r->uri.data;
|
|
r->uri.data[r->uri.len] = '\0';
|
|
|
|
if (r->uri_ext) {
|
|
r->exten.len = u - r->uri_ext;
|
|
r->exten.data = r->uri_ext;
|
|
}
|
|
|
|
r->uri_ext = NULL;
|
|
|
|
return NGX_OK;
|
|
}
|