Mercurial > hg > nginx
annotate src/http/ngx_http_request_body.c @ 4072:cf334deeea66
Bugfix: read event was not blocked after reading body.
Read event should be blocked after reading body, else undefined behaviour
might occur on additional client activity. This fixes segmentation faults
observed with proxy_ignore_client_abort set.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 05 Sep 2011 12:43:31 +0000 |
parents | 87f47e05fc82 |
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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10 |
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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 |
160
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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 */ | |
83
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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; |
83
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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 } | |
82
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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 { |
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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; |
162
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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; |
160
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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 { |
3166
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487 r->count++; |
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488 r->discard_body = 1; |
3166
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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 ( ;; ) { |
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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 } |