mirror of
https://github.com/nginx/nginx.git
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616 lines
15 KiB
C
616 lines
15 KiB
C
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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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int ngx_parse_http_request_line(ngx_http_request_t *r)
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{
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char ch;
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char *p;
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enum {
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sw_start = 0,
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sw_G,
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sw_GE,
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sw_H,
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sw_HE,
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sw_HEA,
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sw_P,
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sw_PO,
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sw_POS,
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sw_space_after_method,
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sw_spaces_before_uri,
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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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sw_done
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} state;
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state = r->state;
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p = r->header_in->pos;
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while (p < r->header_in->last && state < sw_done) {
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ch = *p++;
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/* gcc 2.95.2 and vc 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 - 1;
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switch (ch) {
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case 'G':
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state = sw_G;
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break;
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case 'H':
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state = sw_H;
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break;
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case 'P':
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state = sw_P;
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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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case sw_G:
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switch (ch) {
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case 'E':
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state = sw_GE;
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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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case sw_GE:
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switch (ch) {
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case 'T':
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r->method = NGX_HTTP_GET;
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state = sw_space_after_method;
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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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case sw_H:
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switch (ch) {
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case 'E':
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state = sw_HE;
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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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case sw_HE:
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switch (ch) {
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case 'A':
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state = sw_HEA;
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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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case sw_HEA:
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switch (ch) {
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case 'D':
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r->method = NGX_HTTP_HEAD;
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state = sw_space_after_method;
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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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case sw_P:
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switch (ch) {
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case 'O':
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state = sw_PO;
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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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case sw_PO:
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switch (ch) {
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case 'S':
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state = sw_POS;
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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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case sw_POS:
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switch (ch) {
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case 'T':
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r->method = NGX_HTTP_POST;
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state = sw_space_after_method;
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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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/* 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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switch (ch) {
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case '/':
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r->uri_start = p - 1;
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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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r->unusual_uri = 1;
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r->uri_start = p - 1;
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state = sw_uri;
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break;
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}
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break;
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/* check "/.", "//", and "%" in URI */
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case sw_after_slash_in_uri:
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switch (ch) {
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case CR:
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r->uri_end = p - 1;
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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 - 1;
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r->http_minor = 9;
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state = sw_done;
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break;
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case ' ':
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r->uri_end = p - 1;
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state = sw_http_09;
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break;
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case '.':
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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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#if (WIN32)
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r->complex_uri = 1;
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#endif
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break;
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case '?':
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r->args_start = p;
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state = sw_uri;
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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 "%" in URI */
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case sw_check_uri:
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switch (ch) {
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case CR:
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r->uri_end = p - 1;
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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 - 1;
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r->http_minor = 9;
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state = sw_done;
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break;
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case ' ':
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r->uri_end = p - 1;
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state = sw_http_09;
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break;
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case '.':
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r->uri_ext = p;
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break;
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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->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->args_start = p;
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state = sw_uri;
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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 CR:
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r->uri_end = p - 1;
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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 - 1;
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r->http_minor = 9;
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state = sw_done;
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break;
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case ' ':
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r->uri_end = p - 1;
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state = sw_http_09;
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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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state = sw_done;
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break;
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case 'H':
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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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state = sw_done;
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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_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 - 2;
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switch (ch) {
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case LF:
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state = sw_done;
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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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}
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}
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r->header_in->pos = p;
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if (state == sw_done) {
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if (r->request_end == NULL) {
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r->request_end = p - 1;
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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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} else {
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r->state = state;
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return NGX_AGAIN;
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}
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}
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int ngx_parse_http_header_line(ngx_http_request_t *r, ngx_hunk_t *h)
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{
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char c, ch;
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char *p;
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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_almost_done,
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sw_header_almost_done,
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sw_ignore_line,
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sw_done,
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sw_header_done
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} state;
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state = r->state;
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p = h->pos;
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while (p < h->last && state < sw_done) {
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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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switch (ch) {
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case CR:
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r->header_end = p - 1;
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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 - 1;
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state = sw_header_done;
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break;
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default:
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state = sw_name;
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r->header_name_start = p - 1;
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c = ch | 0x20;
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if (c >= 'a' && c <= 'z') {
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break;
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}
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if (ch == '-') {
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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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return NGX_HTTP_PARSE_INVALID_HEADER;
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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 = ch | 0x20;
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if (c >= 'a' && c <= 'z') {
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break;
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}
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if (ch == ':') {
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r->header_name_end = p - 1;
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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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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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/* IIS can send 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 == 5
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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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return NGX_HTTP_PARSE_INVALID_HEADER;
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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 - 1;
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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 - 1;
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state = sw_done;
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break;
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default:
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r->header_start = p - 1;
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state = sw_value;
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break;
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}
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break;
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/* header value */
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case sw_value:
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switch (ch) {
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case ' ':
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r->header_end = p - 1;
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state = sw_space_after_value;
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break;
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case CR:
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r->header_end = p - 1;
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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_end = p - 1;
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state = sw_done;
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break;
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}
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break;
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/* space* before end of header line */
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case sw_space_after_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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state = sw_almost_done;
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break;
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case LF:
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state = sw_done;
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break;
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default:
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state = sw_value;
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break;
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}
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break;
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/* ignore header line */
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case sw_ignore_line:
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switch (ch) {
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case LF:
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state = sw_start;
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break;
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default:
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break;
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}
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break;
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/* end of header line */
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case sw_almost_done:
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switch (ch) {
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case LF:
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state = sw_done;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_HEADER;
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}
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break;
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/* end of header */
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case sw_header_almost_done:
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switch (ch) {
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case LF:
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state = sw_header_done;
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break;
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default:
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return NGX_HTTP_PARSE_INVALID_HEADER;
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}
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break;
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}
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}
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h->pos = p;
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if (state == sw_done) {
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r->state = sw_start;
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return NGX_OK;
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} else if (state == sw_header_done) {
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r->state = sw_start;
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return NGX_HTTP_PARSE_HEADER_DONE;
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} else {
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r->state = state;
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return NGX_AGAIN;
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}
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}
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