Mercurial > hg > nginx

annotate src/http/v2/ngx_http_v2_encode.c @ 9275:199dc0d6b05b

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Added max_headers directive. The directive limits the number of request headers accepted from clients. While the total amount of headers is believed to be sufficiently limited by the existing buffer size limits (client_header_buffer_size and large_client_header_buffers), the additional limit on the number of headers might be beneficial to better protect backend servers. Requested by Maksim Yevmenkin.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 24 May 2024 00:20:01 +0300
parents 336084ff943b
children
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1
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2 /*
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3 * Copyright (C) Nginx, Inc.
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4 * Copyright (C) Valentin V. Bartenev
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5 */
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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13 static u_char *ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix,
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14 ngx_uint_t value);
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17 u_char *
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18 ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, u_char *tmp,
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19 ngx_uint_t lower)
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20 {
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21 size_t hlen;
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22
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336084ff943b Moved Huffman coding out of HTTP/2.
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23 hlen = ngx_http_huff_encode(src, len, tmp, lower);
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25 if (hlen > 0) {
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26 *dst = NGX_HTTP_V2_ENCODE_HUFF;
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27 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), hlen);
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28 return ngx_cpymem(dst, tmp, hlen);
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29 }
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31 *dst = NGX_HTTP_V2_ENCODE_RAW;
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32 dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), len);
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33
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34 if (lower) {
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35 ngx_strlow(dst, src, len);
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36 return dst + len;
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37 }
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38
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39 return ngx_cpymem(dst, src, len);
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40 }
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43 static u_char *
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44 ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, ngx_uint_t value)
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45 {
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46 if (value < prefix) {
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47 *pos++ |= value;
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48 return pos;
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49 }
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51 *pos++ |= prefix;
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52 value -= prefix;
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54 while (value >= 128) {
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55 *pos++ = value % 128 + 128;
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56 value /= 128;
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57 }
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59 *pos++ = (u_char) value;
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60
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61 return pos;
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62 }