Mercurial > hg > nginx-quic
annotate src/http/ngx_http_request_body.c @ 4339:6f97afc238de
Cache: handling of cache files with long headers.
There are two possible situations which can lead to this: response was
cached with bigger proxy_buffer_size value (and nginx was restared since
then, i.e. shared memory zone content was lost), or due to the race in
the cache update code (see [1]) we've end up with fcn->body_start from
a different response stored in shared memory zone.
[1] http://mailman.nginx.org/pipermail/nginx-devel/2011-September/001287.html
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 12 Dec 2011 10:47:48 +0000 |
parents | cf334deeea66 |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_http.h> |
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11 |
509 | 12 static void ngx_http_read_client_request_body_handler(ngx_http_request_t *r); |
13 static ngx_int_t ngx_http_do_read_client_request_body(ngx_http_request_t *r); | |
633 | 14 static ngx_int_t ngx_http_write_request_body(ngx_http_request_t *r, |
15 ngx_chain_t *body); | |
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16 static ngx_int_t ngx_http_read_discarded_request_body(ngx_http_request_t *r); |
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17 static ngx_int_t ngx_http_test_expect(ngx_http_request_t *r); |
633 | 18 |
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19 |
479 | 20 /* |
21 * on completion ngx_http_read_client_request_body() adds to | |
22 * r->request_body->bufs one or two bufs: | |
23 * *) one memory buf that was preread in r->header_in; | |
24 * *) one memory or file buf that contains the rest of the body | |
25 */ | |
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26 |
501 | 27 ngx_int_t |
28 ngx_http_read_client_request_body(ngx_http_request_t *r, | |
29 ngx_http_client_body_handler_pt post_handler) | |
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30 { |
663 | 31 size_t preread; |
32 ssize_t size; | |
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33 ngx_buf_t *b; |
633 | 34 ngx_chain_t *cl, **next; |
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35 ngx_temp_file_t *tf; |
479 | 36 ngx_http_request_body_t *rb; |
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37 ngx_http_core_loc_conf_t *clcf; |
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38 |
3049 | 39 r->main->count++; |
40 | |
537 | 41 if (r->request_body || r->discard_body) { |
509 | 42 post_handler(r); |
43 return NGX_OK; | |
44 } | |
45 | |
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46 if (ngx_http_test_expect(r) != NGX_OK) { |
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47 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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48 } |
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49 |
501 | 50 rb = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t)); |
51 if (rb == NULL) { | |
479 | 52 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
53 } | |
54 | |
55 r->request_body = rb; | |
56 | |
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57 if (r->headers_in.content_length_n < 0) { |
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58 post_handler(r); |
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59 return NGX_OK; |
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60 } |
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61 |
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62 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
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63 |
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64 if (r->headers_in.content_length_n == 0) { |
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65 |
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66 if (r->request_body_in_file_only) { |
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67 tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)); |
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68 if (tf == NULL) { |
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69 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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70 } |
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71 |
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72 tf->file.fd = NGX_INVALID_FILE; |
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73 tf->file.log = r->connection->log; |
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74 tf->path = clcf->client_body_temp_path; |
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75 tf->pool = r->pool; |
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76 tf->warn = "a client request body is buffered to a temporary file"; |
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77 tf->log_level = r->request_body_file_log_level; |
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78 tf->persistent = r->request_body_in_persistent_file; |
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79 tf->clean = r->request_body_in_clean_file; |
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80 |
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81 if (r->request_body_file_group_access) { |
1046 | 82 tf->access = 0660; |
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83 } |
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84 |
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85 rb->temp_file = tf; |
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86 |
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87 if (ngx_create_temp_file(&tf->file, tf->path, tf->pool, |
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88 tf->persistent, tf->clean, tf->access) |
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89 != NGX_OK) |
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90 { |
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91 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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92 } |
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93 } |
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94 |
479 | 95 post_handler(r); |
1290 | 96 |
479 | 97 return NGX_OK; |
98 } | |
99 | |
100 rb->post_handler = post_handler; | |
101 | |
102 /* | |
103 * set by ngx_pcalloc(): | |
104 * | |
105 * rb->bufs = NULL; | |
106 * rb->buf = NULL; | |
107 * rb->rest = 0; | |
108 */ | |
109 | |
633 | 110 preread = r->header_in->last - r->header_in->pos; |
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111 |
633 | 112 if (preread) { |
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113 |
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114 /* there is the pre-read part of the request body */ |
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115 |
633 | 116 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
117 "http client request body preread %uz", preread); | |
118 | |
501 | 119 b = ngx_calloc_buf(r->pool); |
120 if (b == NULL) { | |
479 | 121 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
122 } | |
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123 |
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124 b->temporary = 1; |
633 | 125 b->start = r->header_in->pos; |
126 b->pos = r->header_in->pos; | |
127 b->last = r->header_in->last; | |
128 b->end = r->header_in->end; | |
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129 |
501 | 130 rb->bufs = ngx_alloc_chain_link(r->pool); |
131 if (rb->bufs == NULL) { | |
479 | 132 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
133 } | |
134 | |
135 rb->bufs->buf = b; | |
136 rb->bufs->next = NULL; | |
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137 |
667 | 138 rb->buf = b; |
139 | |
665 | 140 if ((off_t) preread >= r->headers_in.content_length_n) { |
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141 |
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142 /* the whole request body was pre-read */ |
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143 |
663 | 144 r->header_in->pos += (size_t) r->headers_in.content_length_n; |
475 | 145 r->request_length += r->headers_in.content_length_n; |
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146 b->last = r->header_in->pos; |
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147 |
633 | 148 if (r->request_body_in_file_only) { |
149 if (ngx_http_write_request_body(r, rb->bufs) != NGX_OK) { | |
150 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
151 } | |
152 } | |
153 | |
479 | 154 post_handler(r); |
299
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155 |
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156 return NGX_OK; |
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157 } |
162
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158 |
633 | 159 /* |
160 * to not consider the body as pipelined request in | |
161 * ngx_http_set_keepalive() | |
162 */ | |
162
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163 r->header_in->pos = r->header_in->last; |
633 | 164 |
165 r->request_length += preread; | |
166 | |
167 rb->rest = r->headers_in.content_length_n - preread; | |
168 | |
665 | 169 if (rb->rest <= (off_t) (b->end - b->last)) { |
633 | 170 |
171 /* the whole request body may be placed in r->header_in */ | |
172 | |
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173 rb->to_write = rb->bufs; |
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174 |
633 | 175 r->read_event_handler = ngx_http_read_client_request_body_handler; |
176 | |
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177 return ngx_http_do_read_client_request_body(r); |
633 | 178 } |
179 | |
180 next = &rb->bufs->next; | |
181 | |
182 } else { | |
183 b = NULL; | |
184 rb->rest = r->headers_in.content_length_n; | |
185 next = &rb->bufs; | |
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186 } |
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187 |
633 | 188 size = clcf->client_body_buffer_size; |
189 size += size >> 2; | |
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190 |
663 | 191 if (rb->rest < size) { |
192 size = (ssize_t) rb->rest; | |
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193 |
633 | 194 if (r->request_body_in_single_buf) { |
195 size += preread; | |
196 } | |
197 | |
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198 } else { |
303
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199 size = clcf->client_body_buffer_size; |
633 | 200 |
201 /* disable copying buffer for r->request_body_in_single_buf */ | |
202 b = NULL; | |
160
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203 } |
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204 |
501 | 205 rb->buf = ngx_create_temp_buf(r->pool, size); |
206 if (rb->buf == NULL) { | |
479 | 207 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
208 } | |
160
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209 |
501 | 210 cl = ngx_alloc_chain_link(r->pool); |
211 if (cl == NULL) { | |
479 | 212 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
213 } | |
160
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214 |
479 | 215 cl->buf = rb->buf; |
216 cl->next = NULL; | |
217 | |
633 | 218 if (b && r->request_body_in_single_buf) { |
219 size = b->last - b->pos; | |
220 ngx_memcpy(rb->buf->pos, b->pos, size); | |
221 rb->buf->last += size; | |
222 | |
223 next = &rb->bufs; | |
224 } | |
225 | |
226 *next = cl; | |
227 | |
228 if (r->request_body_in_file_only || r->request_body_in_single_buf) { | |
229 rb->to_write = rb->bufs; | |
160
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230 |
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231 } else { |
633 | 232 rb->to_write = rb->bufs->next ? rb->bufs->next : rb->bufs; |
160
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233 } |
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234 |
509 | 235 r->read_event_handler = ngx_http_read_client_request_body_handler; |
82
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236 |
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237 return ngx_http_do_read_client_request_body(r); |
82
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238 } |
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239 |
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240 |
501 | 241 static void |
509 | 242 ngx_http_read_client_request_body_handler(ngx_http_request_t *r) |
82
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243 { |
509 | 244 ngx_int_t rc; |
293
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245 |
509 | 246 if (r->connection->read->timedout) { |
577 | 247 r->connection->timedout = 1; |
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248 ngx_http_finalize_request(r, NGX_HTTP_REQUEST_TIME_OUT); |
299
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249 return; |
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250 } |
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251 |
509 | 252 rc = ngx_http_do_read_client_request_body(r); |
293
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253 |
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254 if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { |
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255 ngx_http_finalize_request(r, rc); |
293
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256 } |
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257 } |
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258 |
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259 |
501 | 260 static ngx_int_t |
509 | 261 ngx_http_do_read_client_request_body(ngx_http_request_t *r) |
293
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262 { |
290
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263 size_t size; |
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264 ssize_t n; |
343
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265 ngx_buf_t *b; |
509 | 266 ngx_connection_t *c; |
479 | 267 ngx_http_request_body_t *rb; |
162
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268 ngx_http_core_loc_conf_t *clcf; |
82
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269 |
509 | 270 c = r->connection; |
479 | 271 rb = r->request_body; |
82
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272 |
292
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273 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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274 "http read client request body"); |
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275 |
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276 for ( ;; ) { |
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277 for ( ;; ) { |
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278 if (rb->buf->last == rb->buf->end) { |
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279 |
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280 if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) { |
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281 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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282 } |
479 | 283 |
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284 rb->to_write = rb->bufs->next ? rb->bufs->next : rb->bufs; |
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285 rb->buf->last = rb->buf->start; |
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286 } |
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287 |
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288 size = rb->buf->end - rb->buf->last; |
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289 |
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290 if ((off_t) size > rb->rest) { |
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291 size = (size_t) rb->rest; |
292
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292 } |
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293 |
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294 n = c->recv(c, rb->buf->last, size); |
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295 |
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296 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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297 "http client request body recv %z", n); |
82
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298 |
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299 if (n == NGX_AGAIN) { |
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300 break; |
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301 } |
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302 |
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303 if (n == 0) { |
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304 ngx_log_error(NGX_LOG_INFO, c->log, 0, |
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305 "client closed prematurely connection"); |
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306 } |
292
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307 |
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308 if (n == 0 || n == NGX_ERROR) { |
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309 c->error = 1; |
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310 return NGX_HTTP_BAD_REQUEST; |
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311 } |
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312 |
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313 rb->buf->last += n; |
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314 rb->rest -= n; |
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315 r->request_length += n; |
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316 |
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317 if (rb->rest == 0) { |
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318 break; |
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319 } |
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320 |
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321 if (rb->buf->last < rb->buf->end) { |
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322 break; |
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323 } |
292
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324 } |
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325 |
293
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326 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, |
1112 | 327 "http client request body rest %O", rb->rest); |
292
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328 |
479 | 329 if (rb->rest == 0) { |
294
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330 break; |
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331 } |
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332 |
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333 if (!c->read->ready) { |
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334 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
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335 ngx_add_timer(c->read, clcf->client_body_timeout); |
293
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336 |
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337 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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338 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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339 } |
573 | 340 |
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341 return NGX_AGAIN; |
573 | 342 } |
82
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343 } |
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344 |
573 | 345 if (c->read->timer_set) { |
346 ngx_del_timer(c->read); | |
347 } | |
348 | |
633 | 349 if (rb->temp_file || r->request_body_in_file_only) { |
82
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350 |
160
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351 /* save the last part */ |
479 | 352 |
633 | 353 if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) { |
293
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354 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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355 } |
160
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356 |
501 | 357 b = ngx_calloc_buf(r->pool); |
358 if (b == NULL) { | |
293
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359 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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360 } |
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361 |
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362 b->in_file = 1; |
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363 b->file_pos = 0; |
479 | 364 b->file_last = rb->temp_file->file.offset; |
365 b->file = &rb->temp_file->file; | |
160
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366 |
479 | 367 if (rb->bufs->next) { |
368 rb->bufs->next->buf = b; | |
160
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369 |
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370 } else { |
479 | 371 rb->bufs->buf = b; |
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372 } |
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373 } |
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374 |
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375 if (rb->bufs->next |
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376 && (r->request_body_in_file_only || r->request_body_in_single_buf)) |
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377 { |
633 | 378 rb->bufs = rb->bufs->next; |
379 } | |
380 | |
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381 r->read_event_handler = ngx_http_block_reading; |
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382 |
479 | 383 rb->post_handler(r); |
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384 |
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385 return NGX_OK; |
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386 } |
633 | 387 |
388 | |
389 static ngx_int_t | |
390 ngx_http_write_request_body(ngx_http_request_t *r, ngx_chain_t *body) | |
391 { | |
392 ssize_t n; | |
393 ngx_temp_file_t *tf; | |
394 ngx_http_request_body_t *rb; | |
395 ngx_http_core_loc_conf_t *clcf; | |
396 | |
397 rb = r->request_body; | |
398 | |
399 if (rb->temp_file == NULL) { | |
400 tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)); | |
401 if (tf == NULL) { | |
402 return NGX_ERROR; | |
403 } | |
404 | |
405 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); | |
406 | |
407 tf->file.fd = NGX_INVALID_FILE; | |
408 tf->file.log = r->connection->log; | |
409 tf->path = clcf->client_body_temp_path; | |
410 tf->pool = r->pool; | |
411 tf->warn = "a client request body is buffered to a temporary file"; | |
637 | 412 tf->log_level = r->request_body_file_log_level; |
633 | 413 tf->persistent = r->request_body_in_persistent_file; |
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414 tf->clean = r->request_body_in_clean_file; |
633 | 415 |
416 if (r->request_body_file_group_access) { | |
1046 | 417 tf->access = 0660; |
633 | 418 } |
419 | |
420 rb->temp_file = tf; | |
421 } | |
422 | |
423 n = ngx_write_chain_to_temp_file(rb->temp_file, body); | |
424 | |
425 /* TODO: n == 0 or not complete and level event */ | |
426 | |
427 if (n == NGX_ERROR) { | |
428 return NGX_ERROR; | |
429 } | |
430 | |
431 rb->temp_file->offset += n; | |
432 | |
433 return NGX_OK; | |
434 } | |
435 | |
436 | |
437 ngx_int_t | |
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438 ngx_http_discard_request_body(ngx_http_request_t *r) |
633 | 439 { |
440 ssize_t size; | |
441 ngx_event_t *rev; | |
442 | |
673 | 443 if (r != r->main || r->discard_body) { |
633 | 444 return NGX_OK; |
445 } | |
446 | |
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447 if (ngx_http_test_expect(r) != NGX_OK) { |
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448 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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449 } |
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450 |
633 | 451 rev = r->connection->read; |
452 | |
453 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "http set discard body"); | |
454 | |
455 if (rev->timer_set) { | |
456 ngx_del_timer(rev); | |
457 } | |
458 | |
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459 if (r->headers_in.content_length_n <= 0 || r->request_body) { |
633 | 460 return NGX_OK; |
461 } | |
462 | |
463 size = r->header_in->last - r->header_in->pos; | |
464 | |
465 if (size) { | |
466 if (r->headers_in.content_length_n > size) { | |
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467 r->header_in->pos += size; |
633 | 468 r->headers_in.content_length_n -= size; |
469 | |
470 } else { | |
663 | 471 r->header_in->pos += (size_t) r->headers_in.content_length_n; |
633 | 472 r->headers_in.content_length_n = 0; |
473 return NGX_OK; | |
474 } | |
475 } | |
476 | |
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477 r->read_event_handler = ngx_http_discarded_request_body_handler; |
633 | 478 |
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479 if (ngx_handle_read_event(rev, 0) != NGX_OK) { |
633 | 480 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
481 } | |
482 | |
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483 if (ngx_http_read_discarded_request_body(r) == NGX_OK) { |
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484 r->lingering_close = 0; |
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485 |
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486 } else { |
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487 r->count++; |
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488 r->discard_body = 1; |
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489 } |
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490 |
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491 return NGX_OK; |
633 | 492 } |
493 | |
494 | |
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495 void |
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496 ngx_http_discarded_request_body_handler(ngx_http_request_t *r) |
633 | 497 { |
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498 ngx_int_t rc; |
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499 ngx_msec_t timer; |
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500 ngx_event_t *rev; |
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501 ngx_connection_t *c; |
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502 ngx_http_core_loc_conf_t *clcf; |
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503 |
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504 c = r->connection; |
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505 rev = c->read; |
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506 |
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507 if (rev->timedout) { |
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508 c->timedout = 1; |
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509 c->error = 1; |
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510 ngx_http_finalize_request(r, NGX_ERROR); |
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511 return; |
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512 } |
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513 |
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514 if (r->lingering_time) { |
1640 | 515 timer = (ngx_msec_t) (r->lingering_time - ngx_time()); |
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516 |
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517 if (timer <= 0) { |
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518 r->discard_body = 0; |
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519 r->lingering_close = 0; |
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520 ngx_http_finalize_request(r, NGX_ERROR); |
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521 return; |
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522 } |
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523 |
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524 } else { |
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525 timer = 0; |
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526 } |
633 | 527 |
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528 rc = ngx_http_read_discarded_request_body(r); |
633 | 529 |
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530 if (rc == NGX_OK) { |
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531 r->discard_body = 0; |
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532 r->lingering_close = 0; |
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533 ngx_http_finalize_request(r, NGX_DONE); |
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534 return; |
633 | 535 } |
536 | |
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537 /* rc == NGX_AGAIN */ |
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538 |
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539 if (ngx_handle_read_event(rev, 0) != NGX_OK) { |
1456 | 540 c->error = 1; |
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541 ngx_http_finalize_request(r, NGX_ERROR); |
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542 return; |
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543 } |
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544 |
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545 if (timer) { |
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546 |
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547 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
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548 |
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549 timer *= 1000; |
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550 |
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551 if (timer > clcf->lingering_timeout) { |
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552 timer = clcf->lingering_timeout; |
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553 } |
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554 |
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555 ngx_add_timer(rev, timer); |
633 | 556 } |
557 } | |
558 | |
559 | |
560 static ngx_int_t | |
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561 ngx_http_read_discarded_request_body(ngx_http_request_t *r) |
633 | 562 { |
663 | 563 size_t size; |
564 ssize_t n; | |
633 | 565 u_char buffer[NGX_HTTP_DISCARD_BUFFER_SIZE]; |
566 | |
567 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
568 "http read discarded body"); | |
569 | |
3162 | 570 for ( ;; ) { |
1367
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571 if (r->headers_in.content_length_n == 0) { |
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572 r->read_event_handler = ngx_http_block_reading; |
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573 return NGX_OK; |
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574 } |
633 | 575 |
3162 | 576 if (!r->connection->read->ready) { |
577 return NGX_AGAIN; | |
578 } | |
579 | |
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580 size = (r->headers_in.content_length_n > NGX_HTTP_DISCARD_BUFFER_SIZE) ? |
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581 NGX_HTTP_DISCARD_BUFFER_SIZE: |
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582 (size_t) r->headers_in.content_length_n; |
633 | 583 |
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584 n = r->connection->recv(r->connection, buffer, size); |
633 | 585 |
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586 if (n == NGX_ERROR) { |
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587 r->connection->error = 1; |
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588 return NGX_OK; |
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589 } |
633 | 590 |
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591 if (n == NGX_AGAIN) { |
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592 return NGX_AGAIN; |
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593 } |
633 | 594 |
1422
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595 if (n == 0) { |
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596 return NGX_OK; |
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597 } |
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598 |
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599 r->headers_in.content_length_n -= n; |
3162 | 600 } |
633 | 601 } |
2436
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602 |
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603 |
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604 static ngx_int_t |
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605 ngx_http_test_expect(ngx_http_request_t *r) |
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606 { |
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607 ngx_int_t n; |
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608 ngx_str_t *expect; |
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609 |
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610 if (r->expect_tested |
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611 || r->headers_in.expect == NULL |
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612 || r->http_version < NGX_HTTP_VERSION_11) |
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613 { |
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614 return NGX_OK; |
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615 } |
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616 |
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617 r->expect_tested = 1; |
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618 |
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619 expect = &r->headers_in.expect->value; |
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620 |
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621 if (expect->len != sizeof("100-continue") - 1 |
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622 || ngx_strncasecmp(expect->data, (u_char *) "100-continue", |
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623 sizeof("100-continue") - 1) |
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624 != 0) |
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625 { |
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626 return NGX_OK; |
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627 } |
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628 |
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629 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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630 "send 100 Continue"); |
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631 |
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632 n = r->connection->send(r->connection, |
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633 (u_char *) "HTTP/1.1 100 Continue" CRLF CRLF, |
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634 sizeof("HTTP/1.1 100 Continue" CRLF CRLF) - 1); |
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635 |
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636 if (n == sizeof("HTTP/1.1 100 Continue" CRLF CRLF) - 1) { |
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637 return NGX_OK; |
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638 } |
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639 |
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640 /* we assume that such small packet should be send successfully */ |
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641 |
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642 return NGX_ERROR; |
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643 } |