Mercurial > hg > nginx
annotate src/http/modules/ngx_http_sub_filter_module.c @ 5288:102d7117ffb8
Sub filter: fixed matching after a partial match.
After a failed partial match we now check if there is another partial
match in previously matched substring to fix cases like "aab" in "aaab".
The ctx->saved string is now always sent if it's present on return
from the ngx_http_sub_parse() function (and reset accordingly). This
allows to release parts of previously matched data.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Thu, 25 Jul 2013 14:54:53 +0400 |
| parents | 2dbc5e38b65d |
| children | 9e9c1310d17c |
| rev | line source |
|---|---|
| 1172 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 1172 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_http.h> | |
| 11 | |
| 12 | |
| 13 typedef struct { | |
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14 ngx_str_t match; |
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15 ngx_http_complex_value_t value; |
| 1172 | 16 |
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17 ngx_hash_t types; |
| 1172 | 18 |
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19 ngx_flag_t once; |
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20 ngx_flag_t last_modified; |
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21 |
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22 ngx_array_t *types_keys; |
| 1172 | 23 } ngx_http_sub_loc_conf_t; |
| 24 | |
| 25 | |
| 26 typedef enum { | |
| 27 sub_start_state = 0, | |
| 28 sub_match_state, | |
| 29 } ngx_http_sub_state_e; | |
| 30 | |
| 31 | |
| 32 typedef struct { | |
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33 ngx_str_t match; |
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34 ngx_str_t saved; |
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35 ngx_str_t looked; |
| 1172 | 36 |
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37 ngx_uint_t once; /* unsigned once:1 */ |
| 1172 | 38 |
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39 ngx_buf_t *buf; |
| 1172 | 40 |
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41 u_char *pos; |
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42 u_char *copy_start; |
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43 u_char *copy_end; |
| 1172 | 44 |
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45 ngx_chain_t *in; |
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46 ngx_chain_t *out; |
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47 ngx_chain_t **last_out; |
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48 ngx_chain_t *busy; |
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49 ngx_chain_t *free; |
| 1172 | 50 |
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51 ngx_str_t sub; |
| 1172 | 52 |
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53 ngx_uint_t state; |
| 1172 | 54 } ngx_http_sub_ctx_t; |
| 55 | |
| 56 | |
| 57 static ngx_int_t ngx_http_sub_output(ngx_http_request_t *r, | |
| 58 ngx_http_sub_ctx_t *ctx); | |
| 59 static ngx_int_t ngx_http_sub_parse(ngx_http_request_t *r, | |
| 60 ngx_http_sub_ctx_t *ctx); | |
| 61 | |
| 62 static char * ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 63 void *conf); | |
| 64 static void *ngx_http_sub_create_conf(ngx_conf_t *cf); | |
| 65 static char *ngx_http_sub_merge_conf(ngx_conf_t *cf, | |
| 66 void *parent, void *child); | |
| 67 static ngx_int_t ngx_http_sub_filter_init(ngx_conf_t *cf); | |
| 68 | |
| 69 | |
| 70 static ngx_command_t ngx_http_sub_filter_commands[] = { | |
| 71 | |
| 72 { ngx_string("sub_filter"), | |
| 73 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, | |
| 74 ngx_http_sub_filter, | |
| 75 NGX_HTTP_LOC_CONF_OFFSET, | |
| 76 0, | |
| 77 NULL }, | |
| 78 | |
| 79 { ngx_string("sub_filter_types"), | |
| 80 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, | |
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81 ngx_http_types_slot, |
| 1172 | 82 NGX_HTTP_LOC_CONF_OFFSET, |
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83 offsetof(ngx_http_sub_loc_conf_t, types_keys), |
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84 &ngx_http_html_default_types[0] }, |
| 1172 | 85 |
| 86 { ngx_string("sub_filter_once"), | |
| 87 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, | |
| 88 ngx_conf_set_flag_slot, | |
| 89 NGX_HTTP_LOC_CONF_OFFSET, | |
| 90 offsetof(ngx_http_sub_loc_conf_t, once), | |
| 91 NULL }, | |
| 92 | |
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93 { ngx_string("sub_filter_last_modified"), |
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94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, |
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95 ngx_conf_set_flag_slot, |
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96 NGX_HTTP_LOC_CONF_OFFSET, |
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97 offsetof(ngx_http_sub_loc_conf_t, last_modified), |
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98 NULL }, |
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99 |
| 1172 | 100 ngx_null_command |
| 101 }; | |
| 102 | |
| 103 | |
| 104 static ngx_http_module_t ngx_http_sub_filter_module_ctx = { | |
| 105 NULL, /* preconfiguration */ | |
| 106 ngx_http_sub_filter_init, /* postconfiguration */ | |
| 107 | |
| 108 NULL, /* create main configuration */ | |
| 109 NULL, /* init main configuration */ | |
| 110 | |
| 111 NULL, /* create server configuration */ | |
| 112 NULL, /* merge server configuration */ | |
| 113 | |
| 114 ngx_http_sub_create_conf, /* create location configuration */ | |
| 115 ngx_http_sub_merge_conf /* merge location configuration */ | |
| 116 }; | |
| 117 | |
| 118 | |
| 119 ngx_module_t ngx_http_sub_filter_module = { | |
| 120 NGX_MODULE_V1, | |
| 121 &ngx_http_sub_filter_module_ctx, /* module context */ | |
| 122 ngx_http_sub_filter_commands, /* module directives */ | |
| 123 NGX_HTTP_MODULE, /* module type */ | |
| 124 NULL, /* init master */ | |
| 125 NULL, /* init module */ | |
| 126 NULL, /* init process */ | |
| 127 NULL, /* init thread */ | |
| 128 NULL, /* exit thread */ | |
| 129 NULL, /* exit process */ | |
| 130 NULL, /* exit master */ | |
| 131 NGX_MODULE_V1_PADDING | |
| 132 }; | |
| 133 | |
| 134 | |
| 135 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
| 136 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
| 137 | |
| 138 | |
| 139 static ngx_int_t | |
| 140 ngx_http_sub_header_filter(ngx_http_request_t *r) | |
| 141 { | |
| 142 ngx_http_sub_ctx_t *ctx; | |
| 143 ngx_http_sub_loc_conf_t *slcf; | |
| 144 | |
| 145 slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module); | |
| 146 | |
| 147 if (slcf->match.len == 0 | |
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148 || r->headers_out.content_length_n == 0 |
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149 || ngx_http_test_content_type(r, &slcf->types) == NULL) |
| 1172 | 150 { |
| 151 return ngx_http_next_header_filter(r); | |
| 152 } | |
| 153 | |
| 154 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_sub_ctx_t)); | |
| 155 if (ctx == NULL) { | |
| 156 return NGX_ERROR; | |
| 157 } | |
| 158 | |
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159 ctx->saved.data = ngx_pnalloc(r->pool, slcf->match.len); |
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160 if (ctx->saved.data == NULL) { |
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161 return NGX_ERROR; |
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162 } |
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163 |
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164 ctx->looked.data = ngx_pnalloc(r->pool, slcf->match.len); |
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165 if (ctx->looked.data == NULL) { |
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166 return NGX_ERROR; |
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167 } |
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168 |
| 1172 | 169 ngx_http_set_ctx(r, ctx, ngx_http_sub_filter_module); |
| 170 | |
| 171 ctx->match = slcf->match; | |
| 172 ctx->last_out = &ctx->out; | |
| 173 | |
| 174 r->filter_need_in_memory = 1; | |
| 175 | |
| 176 if (r == r->main) { | |
| 177 ngx_http_clear_content_length(r); | |
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178 ngx_http_clear_etag(r); |
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179 |
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180 if (!slcf->last_modified) { |
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181 ngx_http_clear_last_modified(r); |
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182 } |
| 1172 | 183 } |
| 184 | |
| 185 return ngx_http_next_header_filter(r); | |
| 186 } | |
| 187 | |
| 188 | |
| 189 static ngx_int_t | |
| 190 ngx_http_sub_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 191 { | |
| 192 ngx_int_t rc; | |
| 193 ngx_buf_t *b; | |
| 194 ngx_chain_t *cl; | |
| 195 ngx_http_sub_ctx_t *ctx; | |
| 196 ngx_http_sub_loc_conf_t *slcf; | |
| 197 | |
| 198 ctx = ngx_http_get_module_ctx(r, ngx_http_sub_filter_module); | |
| 199 | |
| 200 if (ctx == NULL) { | |
| 201 return ngx_http_next_body_filter(r, in); | |
| 202 } | |
| 203 | |
| 204 if ((in == NULL | |
| 205 && ctx->buf == NULL | |
| 206 && ctx->in == NULL | |
| 207 && ctx->busy == NULL)) | |
| 208 { | |
| 209 return ngx_http_next_body_filter(r, in); | |
| 210 } | |
| 211 | |
| 212 if (ctx->once && (ctx->buf == NULL || ctx->in == NULL)) { | |
| 213 | |
| 214 if (ctx->busy) { | |
| 215 if (ngx_http_sub_output(r, ctx) == NGX_ERROR) { | |
| 216 return NGX_ERROR; | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 return ngx_http_next_body_filter(r, in); | |
| 221 } | |
| 222 | |
| 223 /* add the incoming chain to the chain ctx->in */ | |
| 224 | |
| 225 if (in) { | |
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226 if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) { |
| 1172 | 227 return NGX_ERROR; |
| 228 } | |
| 229 } | |
| 230 | |
| 231 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 232 "http sub filter \"%V\"", &r->uri); | |
| 233 | |
| 234 while (ctx->in || ctx->buf) { | |
| 235 | |
| 3642 | 236 if (ctx->buf == NULL) { |
| 1172 | 237 ctx->buf = ctx->in->buf; |
| 238 ctx->in = ctx->in->next; | |
| 239 ctx->pos = ctx->buf->pos; | |
| 240 } | |
| 241 | |
| 242 if (ctx->state == sub_start_state) { | |
| 243 ctx->copy_start = ctx->pos; | |
| 244 ctx->copy_end = ctx->pos; | |
| 245 } | |
| 246 | |
| 247 b = NULL; | |
| 248 | |
| 249 while (ctx->pos < ctx->buf->last) { | |
| 250 | |
| 251 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
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252 "saved: \"%V\" state: %d", &ctx->saved, ctx->state); |
| 1172 | 253 |
| 254 rc = ngx_http_sub_parse(r, ctx); | |
| 255 | |
| 256 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
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257 "parse: %d, looked: \"%V\" %p-%p", |
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258 rc, &ctx->looked, ctx->copy_start, ctx->copy_end); |
| 1172 | 259 |
| 260 if (rc == NGX_ERROR) { | |
| 261 return rc; | |
| 262 } | |
| 263 | |
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264 if (ctx->saved.len) { |
| 1172 | 265 |
| 266 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
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267 "saved: \"%V\"", &ctx->saved); |
| 1172 | 268 |
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269 cl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
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270 if (cl == NULL) { |
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271 return NGX_ERROR; |
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272 } |
| 1172 | 273 |
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274 b = cl->buf; |
| 1172 | 275 |
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276 ngx_memzero(b, sizeof(ngx_buf_t)); |
| 1172 | 277 |
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278 b->pos = ngx_pnalloc(r->pool, ctx->saved.len); |
|
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279 if (b->pos == NULL) { |
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280 return NGX_ERROR; |
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281 } |
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282 |
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283 ngx_memcpy(b->pos, ctx->saved.data, ctx->saved.len); |
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284 b->last = b->pos + ctx->saved.len; |
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285 b->memory = 1; |
| 1172 | 286 |
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287 *ctx->last_out = cl; |
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288 ctx->last_out = &cl->next; |
| 1172 | 289 |
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290 ctx->saved.len = 0; |
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291 } |
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292 |
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293 if (ctx->copy_start != ctx->copy_end) { |
| 1172 | 294 |
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295 cl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
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296 if (cl == NULL) { |
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297 return NGX_ERROR; |
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298 } |
| 1172 | 299 |
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300 b = cl->buf; |
| 1172 | 301 |
| 302 ngx_memcpy(b, ctx->buf, sizeof(ngx_buf_t)); | |
| 303 | |
| 304 b->pos = ctx->copy_start; | |
| 305 b->last = ctx->copy_end; | |
| 306 b->shadow = NULL; | |
| 307 b->last_buf = 0; | |
| 308 b->recycled = 0; | |
| 309 | |
| 310 if (b->in_file) { | |
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311 b->file_last = b->file_pos + (b->last - ctx->buf->pos); |
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312 b->file_pos += b->pos - ctx->buf->pos; |
| 1172 | 313 } |
| 314 | |
| 315 *ctx->last_out = cl; | |
| 316 ctx->last_out = &cl->next; | |
| 317 } | |
| 318 | |
| 319 if (ctx->state == sub_start_state) { | |
| 320 ctx->copy_start = ctx->pos; | |
| 321 ctx->copy_end = ctx->pos; | |
| 322 | |
| 323 } else { | |
| 324 ctx->copy_start = NULL; | |
| 325 ctx->copy_end = NULL; | |
| 326 } | |
| 327 | |
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328 if (ctx->looked.len > (size_t) (ctx->pos - ctx->buf->pos)) { |
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329 ctx->saved.len = ctx->looked.len - (ctx->pos - ctx->buf->pos); |
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330 ngx_memcpy(ctx->saved.data, ctx->looked.data, ctx->saved.len); |
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331 } |
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332 |
| 1172 | 333 if (rc == NGX_AGAIN) { |
| 334 continue; | |
| 335 } | |
| 336 | |
| 337 | |
| 338 /* rc == NGX_OK */ | |
| 339 | |
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340 cl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
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341 if (cl == NULL) { |
| 1172 | 342 return NGX_ERROR; |
| 343 } | |
| 344 | |
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345 b = cl->buf; |
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346 |
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347 ngx_memzero(b, sizeof(ngx_buf_t)); |
| 1172 | 348 |
| 349 slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module); | |
| 350 | |
| 351 if (ctx->sub.data == NULL) { | |
| 352 | |
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353 if (ngx_http_complex_value(r, &slcf->value, &ctx->sub) |
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354 != NGX_OK) |
| 1172 | 355 { |
| 356 return NGX_ERROR; | |
| 357 } | |
| 358 } | |
| 359 | |
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360 if (ctx->sub.len) { |
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361 b->memory = 1; |
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362 b->pos = ctx->sub.data; |
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363 b->last = ctx->sub.data + ctx->sub.len; |
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364 |
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365 } else { |
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366 b->sync = 1; |
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367 } |
| 1172 | 368 |
| 369 *ctx->last_out = cl; | |
| 370 ctx->last_out = &cl->next; | |
| 371 | |
| 372 ctx->once = slcf->once; | |
| 373 | |
| 374 continue; | |
| 375 } | |
| 376 | |
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377 if (ctx->buf->last_buf && ctx->looked.len) { |
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378 cl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
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379 if (cl == NULL) { |
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380 return NGX_ERROR; |
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381 } |
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382 |
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383 b = cl->buf; |
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384 |
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385 ngx_memzero(b, sizeof(ngx_buf_t)); |
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386 |
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387 b->pos = ctx->looked.data; |
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388 b->last = b->pos + ctx->looked.len; |
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389 b->memory = 1; |
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390 |
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391 *ctx->last_out = cl; |
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392 ctx->last_out = &cl->next; |
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393 |
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394 ctx->looked.len = 0; |
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395 } |
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|
396 |
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397 if (ctx->buf->last_buf || ctx->buf->flush |
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398 || ngx_buf_in_memory(ctx->buf)) |
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399 { |
| 1172 | 400 if (b == NULL) { |
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401 cl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
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402 if (cl == NULL) { |
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403 return NGX_ERROR; |
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404 } |
| 1172 | 405 |
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406 b = cl->buf; |
| 1172 | 407 |
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408 ngx_memzero(b, sizeof(ngx_buf_t)); |
| 1172 | 409 |
| 410 b->sync = 1; | |
| 411 | |
| 412 *ctx->last_out = cl; | |
| 413 ctx->last_out = &cl->next; | |
| 414 } | |
| 415 | |
| 416 b->last_buf = ctx->buf->last_buf; | |
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417 b->flush = ctx->buf->flush; |
| 1172 | 418 b->shadow = ctx->buf; |
| 419 | |
| 420 b->recycled = ctx->buf->recycled; | |
| 421 } | |
| 422 | |
| 423 ctx->buf = NULL; | |
| 424 | |
|
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425 ctx->saved.len = ctx->looked.len; |
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426 ngx_memcpy(ctx->saved.data, ctx->looked.data, ctx->looked.len); |
| 1172 | 427 } |
| 428 | |
| 429 if (ctx->out == NULL && ctx->busy == NULL) { | |
| 430 return NGX_OK; | |
| 431 } | |
| 432 | |
| 433 return ngx_http_sub_output(r, ctx); | |
| 434 } | |
| 435 | |
| 436 | |
| 437 static ngx_int_t | |
| 438 ngx_http_sub_output(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx) | |
| 439 { | |
| 440 ngx_int_t rc; | |
| 441 ngx_buf_t *b; | |
| 442 ngx_chain_t *cl; | |
| 443 | |
| 444 #if 1 | |
| 445 b = NULL; | |
| 446 for (cl = ctx->out; cl; cl = cl->next) { | |
| 447 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 448 "sub out: %p %p", cl->buf, cl->buf->pos); | |
| 449 if (cl->buf == b) { | |
| 450 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, | |
| 451 "the same buf was used in sub"); | |
| 452 ngx_debug_point(); | |
| 453 return NGX_ERROR; | |
| 454 } | |
| 455 b = cl->buf; | |
| 456 } | |
| 457 #endif | |
| 458 | |
| 459 rc = ngx_http_next_body_filter(r, ctx->out); | |
| 460 | |
| 461 if (ctx->busy == NULL) { | |
| 462 ctx->busy = ctx->out; | |
| 463 | |
| 464 } else { | |
| 465 for (cl = ctx->busy; cl->next; cl = cl->next) { /* void */ } | |
| 466 cl->next = ctx->out; | |
| 467 } | |
| 468 | |
| 469 ctx->out = NULL; | |
| 470 ctx->last_out = &ctx->out; | |
| 471 | |
| 472 while (ctx->busy) { | |
| 473 | |
| 474 cl = ctx->busy; | |
| 475 b = cl->buf; | |
| 476 | |
| 477 if (ngx_buf_size(b) != 0) { | |
| 478 break; | |
| 479 } | |
| 480 | |
| 481 if (b->shadow) { | |
| 482 b->shadow->pos = b->shadow->last; | |
| 483 } | |
| 484 | |
| 485 ctx->busy = cl->next; | |
| 486 | |
| 487 if (ngx_buf_in_memory(b) || b->in_file) { | |
| 488 /* add data bufs only to the free buf chain */ | |
| 489 | |
| 490 cl->next = ctx->free; | |
| 491 ctx->free = cl; | |
| 492 } | |
| 493 } | |
| 494 | |
| 495 if (ctx->in || ctx->buf) { | |
| 496 r->buffered |= NGX_HTTP_SUB_BUFFERED; | |
| 497 | |
| 498 } else { | |
| 499 r->buffered &= ~NGX_HTTP_SUB_BUFFERED; | |
| 500 } | |
| 501 | |
| 502 return rc; | |
| 503 } | |
| 504 | |
| 505 | |
| 506 static ngx_int_t | |
| 507 ngx_http_sub_parse(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx) | |
| 508 { | |
| 509 u_char *p, *last, *copy_end, ch, match; | |
|
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|
510 size_t looked, i; |
| 1172 | 511 ngx_http_sub_state_e state; |
| 512 | |
| 513 if (ctx->once) { | |
| 514 ctx->copy_start = ctx->pos; | |
| 515 ctx->copy_end = ctx->buf->last; | |
| 516 ctx->pos = ctx->buf->last; | |
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517 ctx->looked.len = 0; |
| 1172 | 518 |
| 519 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "once"); | |
| 520 | |
| 521 return NGX_AGAIN; | |
| 522 } | |
| 523 | |
| 524 state = ctx->state; | |
|
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|
525 looked = ctx->looked.len; |
| 1172 | 526 last = ctx->buf->last; |
| 527 copy_end = ctx->copy_end; | |
| 528 | |
| 529 for (p = ctx->pos; p < last; p++) { | |
| 530 | |
| 531 ch = *p; | |
| 532 ch = ngx_tolower(ch); | |
| 533 | |
| 534 if (state == sub_start_state) { | |
| 535 | |
| 536 /* the tight loop */ | |
| 537 | |
| 538 match = ctx->match.data[0]; | |
| 539 | |
| 540 for ( ;; ) { | |
| 541 if (ch == match) { | |
| 542 copy_end = p; | |
|
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|
543 ctx->looked.data[0] = *p; |
| 1172 | 544 looked = 1; |
| 545 state = sub_match_state; | |
| 546 | |
| 547 goto match_started; | |
| 548 } | |
| 549 | |
| 550 if (++p == last) { | |
| 551 break; | |
| 552 } | |
| 553 | |
| 554 ch = *p; | |
| 555 ch = ngx_tolower(ch); | |
| 556 } | |
| 557 | |
|
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558 ctx->state = state; |
| 1172 | 559 ctx->pos = p; |
|
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560 ctx->looked.len = looked; |
| 1172 | 561 ctx->copy_end = p; |
| 562 | |
| 563 if (ctx->copy_start == NULL) { | |
| 564 ctx->copy_start = ctx->buf->pos; | |
| 565 } | |
| 566 | |
| 567 return NGX_AGAIN; | |
| 568 | |
| 569 match_started: | |
| 570 | |
| 571 continue; | |
| 572 } | |
| 573 | |
| 574 /* state == sub_match_state */ | |
| 575 | |
| 576 if (ch == ctx->match.data[looked]) { | |
|
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577 ctx->looked.data[looked] = *p; |
| 1172 | 578 looked++; |
| 579 | |
| 580 if (looked == ctx->match.len) { | |
|
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581 |
| 1172 | 582 ctx->state = sub_start_state; |
| 583 ctx->pos = p + 1; | |
|
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584 ctx->looked.len = 0; |
|
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585 ctx->saved.len = 0; |
| 1172 | 586 ctx->copy_end = copy_end; |
| 587 | |
| 588 if (ctx->copy_start == NULL && copy_end) { | |
| 589 ctx->copy_start = ctx->buf->pos; | |
| 590 } | |
| 591 | |
| 592 return NGX_OK; | |
| 593 } | |
| 594 | |
|
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595 } else { |
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596 /* |
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597 * check if there is another partial match in previously |
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598 * matched substring to catch cases like "aab" in "aaab" |
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599 */ |
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600 |
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601 ctx->looked.data[looked] = *p; |
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602 looked++; |
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|
603 |
|
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604 for (i = 1; i < looked; i++) { |
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605 if (ngx_strncasecmp(ctx->looked.data + i, |
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606 ctx->match.data, looked - i) |
|
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607 == 0) |
|
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608 { |
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609 break; |
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610 } |
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611 } |
| 1172 | 612 |
|
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613 if (i < looked) { |
|
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614 if (ctx->saved.len > i) { |
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615 ctx->saved.len = i; |
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616 } |
|
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617 |
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618 if ((size_t) (p + 1 - ctx->buf->pos) >= looked - i) { |
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619 copy_end = p + 1 - (looked - i); |
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620 } |
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621 |
|
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622 ngx_memmove(ctx->looked.data, ctx->looked.data + i, looked - i); |
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623 looked = looked - i; |
|
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624 |
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625 } else { |
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626 copy_end = p; |
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627 looked = 0; |
|
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628 state = sub_start_state; |
|
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629 } |
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|
630 |
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|
631 if (ctx->saved.len) { |
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632 p++; |
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633 goto out; |
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|
634 } |
| 1172 | 635 } |
| 636 } | |
| 637 | |
|
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638 ctx->saved.len = 0; |
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639 |
|
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|
640 out: |
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|
641 |
| 1172 | 642 ctx->state = state; |
| 643 ctx->pos = p; | |
|
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|
644 ctx->looked.len = looked; |
| 1172 | 645 |
| 646 ctx->copy_end = (state == sub_start_state) ? p : copy_end; | |
| 647 | |
| 648 if (ctx->copy_start == NULL && ctx->copy_end) { | |
| 649 ctx->copy_start = ctx->buf->pos; | |
| 650 } | |
| 651 | |
| 652 return NGX_AGAIN; | |
| 653 } | |
| 654 | |
| 655 | |
| 656 static char * | |
| 657 ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 658 { | |
| 659 ngx_http_sub_loc_conf_t *slcf = conf; | |
| 660 | |
|
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661 ngx_str_t *value; |
|
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|
662 ngx_http_compile_complex_value_t ccv; |
| 1172 | 663 |
|
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diff
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|
664 if (slcf->match.data) { |
| 1172 | 665 return "is duplicate"; |
| 666 } | |
| 667 | |
| 668 value = cf->args->elts; | |
| 669 | |
| 2135 | 670 ngx_strlow(value[1].data, value[1].data, value[1].len); |
| 1172 | 671 |
| 2135 | 672 slcf->match = value[1]; |
| 1172 | 673 |
|
2588
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parents:
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diff
changeset
|
674 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
| 1172 | 675 |
|
2588
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|
676 ccv.cf = cf; |
|
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|
677 ccv.value = &value[2]; |
|
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diff
changeset
|
678 ccv.complex_value = &slcf->value; |
| 1172 | 679 |
|
2588
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diff
changeset
|
680 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
| 1172 | 681 return NGX_CONF_ERROR; |
| 682 } | |
| 683 | |
| 684 return NGX_CONF_OK; | |
| 685 } | |
| 686 | |
| 687 | |
| 688 static void * | |
| 689 ngx_http_sub_create_conf(ngx_conf_t *cf) | |
| 690 { | |
| 691 ngx_http_sub_loc_conf_t *slcf; | |
| 692 | |
| 693 slcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_sub_loc_conf_t)); | |
| 694 if (slcf == NULL) { | |
|
2912
c7d57b539248
return NULL instead of NGX_CONF_ERROR on a create conf failure
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diff
changeset
|
695 return NULL; |
| 1172 | 696 } |
| 697 | |
| 698 /* | |
| 699 * set by ngx_pcalloc(): | |
| 700 * | |
|
2166
723df5089c05
use hash in gzip_types, ssi_types, and sub_filter_types
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diff
changeset
|
701 * conf->match = { 0, NULL }; |
|
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diff
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|
702 * conf->types = { NULL }; |
|
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diff
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|
703 * conf->types_keys = NULL; |
| 1172 | 704 */ |
| 705 | |
| 706 slcf->once = NGX_CONF_UNSET; | |
|
5229
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Sub filter: sub_filter_last_modified directive.
Maxim Dounin <mdounin@mdounin.ru>
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changeset
|
707 slcf->last_modified = NGX_CONF_UNSET; |
| 1172 | 708 |
| 709 return slcf; | |
| 710 } | |
| 711 | |
| 712 | |
| 713 static char * | |
| 714 ngx_http_sub_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 715 { | |
| 716 ngx_http_sub_loc_conf_t *prev = parent; | |
| 717 ngx_http_sub_loc_conf_t *conf = child; | |
| 718 | |
| 719 ngx_conf_merge_value(conf->once, prev->once, 1); | |
| 720 ngx_conf_merge_str_value(conf->match, prev->match, ""); | |
|
5229
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Sub filter: sub_filter_last_modified directive.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4947
diff
changeset
|
721 ngx_conf_merge_value(conf->last_modified, prev->last_modified, 0); |
| 1172 | 722 |
|
4947
4251e72b8bb4
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Ruslan Ermilov <ru@nginx.com>
parents:
4746
diff
changeset
|
723 if (conf->value.value.data == NULL) { |
|
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Igor Sysoev <igor@sysoev.ru>
parents:
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diff
changeset
|
724 conf->value = prev->value; |
| 1172 | 725 } |
| 726 | |
|
3372
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support "*" in gzip_types, ssi_types, etc
Igor Sysoev <igor@sysoev.ru>
parents:
2912
diff
changeset
|
727 if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types, |
|
6b8e5c882e47
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Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
728 &prev->types_keys, &prev->types, |
|
2166
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parents:
2135
diff
changeset
|
729 ngx_http_html_default_types) |
|
723df5089c05
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parents:
2135
diff
changeset
|
730 != NGX_OK) |
|
723df5089c05
use hash in gzip_types, ssi_types, and sub_filter_types
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parents:
2135
diff
changeset
|
731 { |
|
723df5089c05
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parents:
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diff
changeset
|
732 return NGX_CONF_ERROR; |
| 1172 | 733 } |
| 734 | |
| 735 return NGX_CONF_OK; | |
| 736 } | |
| 737 | |
| 738 | |
| 739 static ngx_int_t | |
| 740 ngx_http_sub_filter_init(ngx_conf_t *cf) | |
| 741 { | |
| 742 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 743 ngx_http_top_header_filter = ngx_http_sub_header_filter; | |
| 744 | |
| 745 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 746 ngx_http_top_body_filter = ngx_http_sub_body_filter; | |
| 747 | |
| 748 return NGX_OK; | |
| 749 } |