| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_http.h> |
| |
| int ngx_parse_http_request_line(ngx_http_request_t *r) |
| { |
| char ch; |
| char *p; |
| enum { |
| sw_start = 0, |
| sw_G, |
| sw_GE, |
| sw_H, |
| sw_HE, |
| sw_HEA, |
| sw_P, |
| sw_PO, |
| sw_POS, |
| sw_space_after_method, |
| sw_spaces_before_uri, |
| sw_after_slash_in_uri, |
| sw_check_uri, |
| sw_uri, |
| sw_http_09, |
| sw_http_H, |
| sw_http_HT, |
| sw_http_HTT, |
| sw_http_HTTP, |
| sw_first_major_digit, |
| sw_major_digit, |
| sw_first_minor_digit, |
| sw_minor_digit, |
| sw_almost_done, |
| sw_done |
| } state; |
| |
| state = r->state; |
| p = r->header_in->pos; |
| |
| while (p < r->header_in->last && state < sw_done) { |
| ch = *p++; |
| |
| /* gcc 2.95.2 and vc 6.0 compile this switch as an jump table */ |
| |
| switch (state) { |
| |
| /* HTTP methods: GET, HEAD, POST */ |
| case sw_start: |
| r->request_start = p - 1; |
| |
| switch (ch) { |
| case 'G': |
| state = sw_G; |
| break; |
| case 'H': |
| state = sw_H; |
| break; |
| case 'P': |
| state = sw_P; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_G: |
| switch (ch) { |
| case 'E': |
| state = sw_GE; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_GE: |
| switch (ch) { |
| case 'T': |
| r->method = NGX_HTTP_GET; |
| state = sw_space_after_method; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_H: |
| switch (ch) { |
| case 'E': |
| state = sw_HE; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_HE: |
| switch (ch) { |
| case 'A': |
| state = sw_HEA; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_HEA: |
| switch (ch) { |
| case 'D': |
| r->method = NGX_HTTP_HEAD; |
| state = sw_space_after_method; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_P: |
| switch (ch) { |
| case 'O': |
| state = sw_PO; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_PO: |
| switch (ch) { |
| case 'S': |
| state = sw_POS; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| case sw_POS: |
| switch (ch) { |
| case 'T': |
| r->method = NGX_HTTP_POST; |
| state = sw_space_after_method; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| /* single space after method */ |
| case sw_space_after_method: |
| switch (ch) { |
| case ' ': |
| state = sw_spaces_before_uri; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_METHOD; |
| } |
| break; |
| |
| /* space* before URI */ |
| case sw_spaces_before_uri: |
| switch (ch) { |
| case '/': |
| r->uri_start = p - 1; |
| state = sw_after_slash_in_uri; |
| break; |
| case ' ': |
| break; |
| default: |
| r->unusual_uri = 1; |
| r->uri_start = p - 1; |
| state = sw_uri; |
| break; |
| } |
| break; |
| |
| /* check "/.", "//", and "%" in URI */ |
| case sw_after_slash_in_uri: |
| switch (ch) { |
| case CR: |
| r->uri_end = p - 1; |
| r->http_minor = 9; |
| state = sw_almost_done; |
| break; |
| case LF: |
| r->uri_end = p - 1; |
| r->http_minor = 9; |
| state = sw_done; |
| break; |
| case ' ': |
| r->uri_end = p - 1; |
| state = sw_http_09; |
| break; |
| case '.': |
| case '%': |
| r->complex_uri = 1; |
| state = sw_uri; |
| break; |
| case '/': |
| #if (WIN32) |
| r->complex_uri = 1; |
| #endif |
| break; |
| case '?': |
| r->args_start = p; |
| state = sw_uri; |
| break; |
| default: |
| state = sw_check_uri; |
| break; |
| } |
| break; |
| |
| /* check "/" and "%" in URI */ |
| case sw_check_uri: |
| switch (ch) { |
| case CR: |
| r->uri_end = p - 1; |
| r->http_minor = 9; |
| state = sw_almost_done; |
| break; |
| case LF: |
| r->uri_end = p - 1; |
| r->http_minor = 9; |
| state = sw_done; |
| break; |
| case ' ': |
| r->uri_end = p - 1; |
| state = sw_http_09; |
| break; |
| case '.': |
| r->uri_ext = p; |
| break; |
| case '/': |
| r->uri_ext = NULL; |
| state = sw_after_slash_in_uri; |
| break; |
| case '%': |
| r->complex_uri = 1; |
| state = sw_uri; |
| break; |
| case '?': |
| r->args_start = p; |
| state = sw_uri; |
| break; |
| } |
| break; |
| |
| /* URI */ |
| case sw_uri: |
| switch (ch) { |
| case CR: |
| r->uri_end = p - 1; |
| r->http_minor = 9; |
| state = sw_almost_done; |
| break; |
| case LF: |
| r->uri_end = p - 1; |
| r->http_minor = 9; |
| state = sw_done; |
| break; |
| case ' ': |
| r->uri_end = p - 1; |
| state = sw_http_09; |
| break; |
| } |
| break; |
| |
| /* space+ after URI */ |
| case sw_http_09: |
| switch (ch) { |
| case ' ': |
| break; |
| case CR: |
| r->http_minor = 9; |
| state = sw_almost_done; |
| break; |
| case LF: |
| r->http_minor = 9; |
| state = sw_done; |
| break; |
| case 'H': |
| state = sw_http_H; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| break; |
| |
| case sw_http_H: |
| switch (ch) { |
| case 'T': |
| state = sw_http_HT; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| break; |
| |
| case sw_http_HT: |
| switch (ch) { |
| case 'T': |
| state = sw_http_HTT; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| break; |
| |
| case sw_http_HTT: |
| switch (ch) { |
| case 'P': |
| state = sw_http_HTTP; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| break; |
| |
| case sw_http_HTTP: |
| switch (ch) { |
| case '/': |
| state = sw_first_major_digit; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| break; |
| |
| /* first digit of major HTTP version */ |
| case sw_first_major_digit: |
| if (ch < '1' || ch > '9') { |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| |
| r->http_major = ch - '0'; |
| state = sw_major_digit; |
| break; |
| |
| /* major HTTP version or dot */ |
| case sw_major_digit: |
| if (ch == '.') { |
| state = sw_first_minor_digit; |
| break; |
| } |
| |
| if (ch < '0' || ch > '9') { |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| |
| r->http_major = r->http_major * 10 + ch - '0'; |
| break; |
| |
| /* first digit of minor HTTP version */ |
| case sw_first_minor_digit: |
| if (ch < '0' || ch > '9') { |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| |
| r->http_minor = ch - '0'; |
| state = sw_minor_digit; |
| break; |
| |
| /* minor HTTP version or end of request line */ |
| case sw_minor_digit: |
| if (ch == CR) { |
| state = sw_almost_done; |
| break; |
| } |
| |
| if (ch == LF) { |
| state = sw_done; |
| break; |
| } |
| |
| if (ch < '0' || ch > '9') { |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| |
| r->http_minor = r->http_minor * 10 + ch - '0'; |
| break; |
| |
| /* end of request line */ |
| case sw_almost_done: |
| r->request_end = p - 2; |
| switch (ch) { |
| case LF: |
| state = sw_done; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_REQUEST; |
| } |
| break; |
| } |
| } |
| |
| r->header_in->pos = p; |
| |
| if (state == sw_done) { |
| if (r->request_end == NULL) { |
| r->request_end = p - 1; |
| } |
| |
| r->http_version = r->http_major * 1000 + r->http_minor; |
| r->state = sw_start; |
| |
| if (r->http_version == 9 && r->method != NGX_HTTP_GET) { |
| return NGX_HTTP_PARSE_INVALID_09_METHOD; |
| } |
| |
| return NGX_OK; |
| |
| } else { |
| r->state = state; |
| return NGX_AGAIN; |
| } |
| } |
| |
| int ngx_parse_http_header_line(ngx_http_request_t *r, ngx_hunk_t *h) |
| { |
| char c, ch; |
| char *p; |
| enum { |
| sw_start = 0, |
| sw_name, |
| sw_space_before_value, |
| sw_value, |
| sw_space_after_value, |
| sw_almost_done, |
| sw_header_almost_done, |
| sw_ignore_line, |
| sw_done, |
| sw_header_done |
| } state; |
| |
| state = r->state; |
| p = h->pos; |
| |
| while (p < h->last && state < sw_done) { |
| ch = *p++; |
| |
| switch (state) { |
| |
| /* first char */ |
| case sw_start: |
| switch (ch) { |
| case CR: |
| r->header_end = p - 1; |
| state = sw_header_almost_done; |
| break; |
| case LF: |
| r->header_end = p - 1; |
| state = sw_header_done; |
| break; |
| default: |
| state = sw_name; |
| r->header_name_start = p - 1; |
| |
| c = ch | 0x20; |
| if (c >= 'a' && c <= 'z') { |
| break; |
| } |
| |
| if (ch == '-') { |
| break; |
| } |
| |
| if (ch >= '0' && ch <= '9') { |
| break; |
| } |
| |
| return NGX_HTTP_PARSE_INVALID_HEADER; |
| |
| } |
| break; |
| |
| /* header name */ |
| case sw_name: |
| c = ch | 0x20; |
| if (c >= 'a' && c <= 'z') { |
| break; |
| } |
| |
| if (ch == ':') { |
| r->header_name_end = p - 1; |
| state = sw_space_before_value; |
| break; |
| } |
| |
| if (ch == '-') { |
| break; |
| } |
| |
| if (ch >= '0' && ch <= '9') { |
| break; |
| } |
| |
| /* IIS can send duplicate "HTTP/1.1 ..." lines */ |
| if (ch == '/' |
| && r->proxy |
| && p - r->header_start == 5 |
| && ngx_strncmp(r->header_start, "HTTP", 4) == 0) |
| { |
| state = sw_ignore_line; |
| break; |
| } |
| |
| return NGX_HTTP_PARSE_INVALID_HEADER; |
| |
| /* space* before header value */ |
| case sw_space_before_value: |
| switch (ch) { |
| case ' ': |
| break; |
| case CR: |
| r->header_start = r->header_end = p - 1; |
| state = sw_almost_done; |
| break; |
| case LF: |
| r->header_start = r->header_end = p - 1; |
| state = sw_done; |
| break; |
| default: |
| r->header_start = p - 1; |
| state = sw_value; |
| break; |
| } |
| break; |
| |
| /* header value */ |
| case sw_value: |
| switch (ch) { |
| case ' ': |
| r->header_end = p - 1; |
| state = sw_space_after_value; |
| break; |
| case CR: |
| r->header_end = p - 1; |
| state = sw_almost_done; |
| break; |
| case LF: |
| r->header_end = p - 1; |
| state = sw_done; |
| break; |
| } |
| 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: |
| state = sw_done; |
| break; |
| default: |
| state = sw_value; |
| break; |
| } |
| break; |
| |
| /* ignore header line */ |
| case sw_ignore_line: |
| switch (ch) { |
| case LF: |
| state = sw_start; |
| break; |
| default: |
| break; |
| } |
| break; |
| |
| /* end of header line */ |
| case sw_almost_done: |
| switch (ch) { |
| case LF: |
| state = sw_done; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_HEADER; |
| } |
| break; |
| |
| /* end of header */ |
| case sw_header_almost_done: |
| switch (ch) { |
| case LF: |
| state = sw_header_done; |
| break; |
| default: |
| return NGX_HTTP_PARSE_INVALID_HEADER; |
| } |
| break; |
| } |
| } |
| |
| h->pos = p; |
| |
| if (state == sw_done) { |
| r->state = sw_start; |
| return NGX_OK; |
| |
| } else if (state == sw_header_done) { |
| r->state = sw_start; |
| return NGX_HTTP_PARSE_HEADER_DONE; |
| |
| } else { |
| r->state = state; |
| return NGX_AGAIN; |
| } |
| } |
