Mercurial > hg > nginx
annotate src/core/ngx_buf.c @ 9275:199dc0d6b05b
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> |
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date | Fri, 24 May 2024 00:20:01 +0300 |
parents | c7a8bdf5af55 |
children |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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11 |
499 | 12 ngx_buf_t * |
13 ngx_create_temp_buf(ngx_pool_t *pool, size_t size) | |
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14 { |
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15 ngx_buf_t *b; |
16
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16 |
501 | 17 b = ngx_calloc_buf(pool); |
18 if (b == NULL) { | |
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19 return NULL; |
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20 } |
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21 |
501 | 22 b->start = ngx_palloc(pool, size); |
23 if (b->start == NULL) { | |
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24 return NULL; |
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25 } |
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26 |
499 | 27 /* |
28 * set by ngx_calloc_buf(): | |
29 * | |
30 * b->file_pos = 0; | |
31 * b->file_last = 0; | |
32 * b->file = NULL; | |
33 * b->shadow = NULL; | |
34 * b->tag = 0; | |
509 | 35 * and flags |
499 | 36 */ |
37 | |
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38 b->pos = b->start; |
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39 b->last = b->start; |
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40 b->end = b->last + size; |
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41 b->temporary = 1; |
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42 |
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43 return b; |
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44 } |
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45 |
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46 |
499 | 47 ngx_chain_t * |
507 | 48 ngx_alloc_chain_link(ngx_pool_t *pool) |
49 { | |
50 ngx_chain_t *cl; | |
51 | |
52 cl = pool->chain; | |
53 | |
54 if (cl) { | |
55 pool->chain = cl->next; | |
56 return cl; | |
57 } | |
58 | |
59 cl = ngx_palloc(pool, sizeof(ngx_chain_t)); | |
60 if (cl == NULL) { | |
61 return NULL; | |
62 } | |
63 | |
64 return cl; | |
65 } | |
66 | |
67 | |
68 ngx_chain_t * | |
499 | 69 ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs) |
160
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70 { |
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71 u_char *p; |
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72 ngx_int_t i; |
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73 ngx_buf_t *b; |
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74 ngx_chain_t *chain, *cl, **ll; |
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75 |
501 | 76 p = ngx_palloc(pool, bufs->num * bufs->size); |
77 if (p == NULL) { | |
343
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78 return NULL; |
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79 } |
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80 |
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81 ll = &chain; |
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82 |
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83 for (i = 0; i < bufs->num; i++) { |
501 | 84 |
85 b = ngx_calloc_buf(pool); | |
86 if (b == NULL) { | |
343
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87 return NULL; |
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88 } |
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89 |
499 | 90 /* |
91 * set by ngx_calloc_buf(): | |
92 * | |
93 * b->file_pos = 0; | |
94 * b->file_last = 0; | |
95 * b->file = NULL; | |
96 * b->shadow = NULL; | |
97 * b->tag = 0; | |
509 | 98 * and flags |
499 | 99 * |
100 */ | |
101 | |
343
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102 b->pos = p; |
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103 b->last = p; |
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104 b->temporary = 1; |
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105 |
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106 b->start = p; |
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107 p += bufs->size; |
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108 b->end = p; |
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109 |
501 | 110 cl = ngx_alloc_chain_link(pool); |
111 if (cl == NULL) { | |
343
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112 return NULL; |
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113 } |
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114 |
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115 cl->buf = b; |
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116 *ll = cl; |
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117 ll = &cl->next; |
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118 } |
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119 |
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120 *ll = NULL; |
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121 |
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122 return chain; |
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123 } |
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124 |
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125 |
499 | 126 ngx_int_t |
127 ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in) | |
134
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128 { |
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129 ngx_chain_t *cl, **ll; |
134
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130 |
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131 ll = chain; |
134
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133 for (cl = *chain; cl; cl = cl->next) { |
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134 ll = &cl->next; |
134
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135 } |
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136 |
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137 while (in) { |
501 | 138 cl = ngx_alloc_chain_link(pool); |
139 if (cl == NULL) { | |
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140 *ll = NULL; |
501 | 141 return NGX_ERROR; |
142 } | |
134
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143 |
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144 cl->buf = in->buf; |
155
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145 *ll = cl; |
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146 ll = &cl->next; |
134
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147 in = in->next; |
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148 } |
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149 |
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150 *ll = NULL; |
136
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151 |
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152 return NGX_OK; |
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153 } |
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155 |
581 | 156 ngx_chain_t * |
157 ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free) | |
158 { | |
159 ngx_chain_t *cl; | |
160 | |
161 if (*free) { | |
162 cl = *free; | |
163 *free = cl->next; | |
164 cl->next = NULL; | |
165 return cl; | |
166 } | |
167 | |
168 cl = ngx_alloc_chain_link(p); | |
169 if (cl == NULL) { | |
170 return NULL; | |
171 } | |
172 | |
173 cl->buf = ngx_calloc_buf(p); | |
174 if (cl->buf == NULL) { | |
175 return NULL; | |
176 } | |
177 | |
178 cl->next = NULL; | |
179 | |
180 return cl; | |
181 } | |
182 | |
183 | |
499 | 184 void |
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185 ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free, ngx_chain_t **busy, |
499 | 186 ngx_chain_t **out, ngx_buf_tag_t tag) |
132
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187 { |
499 | 188 ngx_chain_t *cl; |
132
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189 |
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190 if (*out) { |
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191 if (*busy == NULL) { |
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192 *busy = *out; |
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193 |
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194 } else { |
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195 for (cl = *busy; cl->next; cl = cl->next) { /* void */ } |
455 | 196 |
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197 cl->next = *out; |
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198 } |
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199 |
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200 *out = NULL; |
132
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201 } |
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202 |
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203 while (*busy) { |
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204 cl = *busy; |
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205 |
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206 if (cl->buf->tag != tag) { |
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207 *busy = cl->next; |
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208 ngx_free_chain(p, cl); |
135
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209 continue; |
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210 } |
132
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211 |
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212 if (ngx_buf_size(cl->buf) != 0) { |
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213 break; |
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214 } |
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215 |
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216 cl->buf->pos = cl->buf->start; |
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217 cl->buf->last = cl->buf->start; |
132
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218 |
499 | 219 *busy = cl->next; |
220 cl->next = *free; | |
221 *free = cl; | |
132
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222 } |
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223 } |
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224 |
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225 |
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226 off_t |
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227 ngx_chain_coalesce_file(ngx_chain_t **in, off_t limit) |
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228 { |
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229 off_t total, size, aligned, fprev; |
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230 ngx_fd_t fd; |
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231 ngx_chain_t *cl; |
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232 |
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233 total = 0; |
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234 |
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235 cl = *in; |
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236 fd = cl->buf->file->fd; |
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237 |
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238 do { |
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239 size = cl->buf->file_last - cl->buf->file_pos; |
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240 |
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241 if (size > limit - total) { |
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242 size = limit - total; |
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243 |
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244 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
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245 & ~((off_t) ngx_pagesize - 1); |
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246 |
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247 if (aligned <= cl->buf->file_last) { |
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248 size = aligned - cl->buf->file_pos; |
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249 } |
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250 |
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251 total += size; |
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252 break; |
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253 } |
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254 |
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255 total += size; |
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256 fprev = cl->buf->file_pos + size; |
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257 cl = cl->next; |
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258 |
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259 } while (cl |
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260 && cl->buf->in_file |
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261 && total < limit |
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262 && fd == cl->buf->file->fd |
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263 && fprev == cl->buf->file_pos); |
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264 |
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265 *in = cl; |
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266 |
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267 return total; |
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268 } |
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269 |
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270 |
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271 ngx_chain_t * |
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272 ngx_chain_update_sent(ngx_chain_t *in, off_t sent) |
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273 { |
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274 off_t size; |
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275 |
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276 for ( /* void */ ; in; in = in->next) { |
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277 |
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278 if (ngx_buf_special(in->buf)) { |
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279 continue; |
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280 } |
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281 |
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282 if (sent == 0) { |
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283 break; |
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284 } |
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285 |
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286 size = ngx_buf_size(in->buf); |
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287 |
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288 if (sent >= size) { |
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289 sent -= size; |
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290 |
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291 if (ngx_buf_in_memory(in->buf)) { |
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292 in->buf->pos = in->buf->last; |
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293 } |
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294 |
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295 if (in->buf->in_file) { |
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296 in->buf->file_pos = in->buf->file_last; |
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297 } |
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298 |
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299 continue; |
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300 } |
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301 |
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302 if (ngx_buf_in_memory(in->buf)) { |
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303 in->buf->pos += (size_t) sent; |
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304 } |
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305 |
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306 if (in->buf->in_file) { |
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307 in->buf->file_pos += sent; |
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308 } |
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309 |
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310 break; |
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311 } |
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312 |
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313 return in; |
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314 } |