1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_http.h>
11
12
13 typedef struct {
14 ngx_array_t *codes; /* uintptr_t */
15
16 ngx_uint_t stack_size;
17
18 ngx_flag_t log;
19 ngx_flag_t uninitialized_variable_warn;
20 } ngx_http_rewrite_loc_conf_t;
21
22
23 static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf);
24 static char *ngx_http_rewrite_merge_loc_conf(ngx_conf_t *cf,
25 void *parent, void *child);
26 static ngx_int_t ngx_http_rewrite_init(ngx_conf_t *cf);
27 static char *ngx_http_rewrite(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
28 static char *ngx_http_rewrite_return(ngx_conf_t *cf, ngx_command_t *cmd,
29 void *conf);
30 static char *ngx_http_rewrite_break(ngx_conf_t *cf, ngx_command_t *cmd,
31 void *conf);
32 static char *ngx_http_rewrite_if(ngx_conf_t *cf, ngx_command_t *cmd,
33 void *conf);
34 static char * ngx_http_rewrite_if_condition(ngx_conf_t *cf,
35 ngx_http_rewrite_loc_conf_t *lcf);
36 static char *ngx_http_rewrite_variable(ngx_conf_t *cf,
37 ngx_http_rewrite_loc_conf_t *lcf, ngx_str_t *value);
38 static char *ngx_http_rewrite_set(ngx_conf_t *cf, ngx_command_t *cmd,
39 void *conf);
40 static char * ngx_http_rewrite_value(ngx_conf_t *cf,
41 ngx_http_rewrite_loc_conf_t *lcf, ngx_str_t *value);
42
43
44 static ngx_command_t ngx_http_rewrite_commands[] = {
45
46 { ngx_string("rewrite"),
47 NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
48 |NGX_CONF_TAKE23,
49 ngx_http_rewrite,
50 NGX_HTTP_LOC_CONF_OFFSET,
51 0,
52 NULL },
53
54 { ngx_string("return"),
55 NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
56 |NGX_CONF_TAKE12,
57 ngx_http_rewrite_return,
58 NGX_HTTP_LOC_CONF_OFFSET,
59 0,
60 NULL },
61
62 { ngx_string("break"),
63 NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
64 |NGX_CONF_NOARGS,
65 ngx_http_rewrite_break,
66 NGX_HTTP_LOC_CONF_OFFSET,
67 0,
68 NULL },
69
70 { ngx_string("if"),
71 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_1MORE,
72 ngx_http_rewrite_if,
73 NGX_HTTP_LOC_CONF_OFFSET,
74 0,
75 NULL },
76
77 { ngx_string("set"),
78 NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
79 |NGX_CONF_TAKE2,
80 ngx_http_rewrite_set,
81 NGX_HTTP_LOC_CONF_OFFSET,
82 0,
83 NULL },
84
85 { ngx_string("rewrite_log"),
86 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF
87 |NGX_HTTP_LIF_CONF|NGX_CONF_FLAG,
88 ngx_conf_set_flag_slot,
89 NGX_HTTP_LOC_CONF_OFFSET,
90 offsetof(ngx_http_rewrite_loc_conf_t, log),
91 NULL },
92
93 { ngx_string("uninitialized_variable_warn"),
94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF|NGX_HTTP_LOC_CONF
95 |NGX_HTTP_LIF_CONF|NGX_CONF_FLAG,
96 ngx_conf_set_flag_slot,
97 NGX_HTTP_LOC_CONF_OFFSET,
98 offsetof(ngx_http_rewrite_loc_conf_t, uninitialized_variable_warn),
99 NULL },
100
101 ngx_null_command
102 };
103
104
105 static ngx_http_module_t ngx_http_rewrite_module_ctx = {
106 NULL, /* preconfiguration */
107 ngx_http_rewrite_init, /* postconfiguration */
108
109 NULL, /* create main configuration */
110 NULL, /* init main configuration */
111
112 NULL, /* create server configuration */
113 NULL, /* merge server configuration */
114
115 ngx_http_rewrite_create_loc_conf, /* create location configuration */
116 ngx_http_rewrite_merge_loc_conf /* merge location configuration */
117 };
118
119
120 ngx_module_t ngx_http_rewrite_module = {
121 NGX_MODULE_V1,
122 &ngx_http_rewrite_module_ctx, /* module context */
123 ngx_http_rewrite_commands, /* module directives */
124 NGX_HTTP_MODULE, /* module type */
125 NULL, /* init master */
126 NULL, /* init module */
127 NULL, /* init process */
128 NULL, /* init thread */
129 NULL, /* exit thread */
130 NULL, /* exit process */
131 NULL, /* exit master */
132 NGX_MODULE_V1_PADDING
133 };
134
135
136 static ngx_int_t
137 ngx_http_rewrite_handler(ngx_http_request_t *r)
138 {
139 ngx_int_t index;
140 ngx_http_script_code_pt code;
141 ngx_http_script_engine_t *e;
142 ngx_http_core_srv_conf_t *cscf;
143 ngx_http_core_main_conf_t *cmcf;
144 ngx_http_rewrite_loc_conf_t *rlcf;
145
146 cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
147 cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
148 index = cmcf->phase_engine.location_rewrite_index;
149
150 if (r->phase_handler == index && r->loc_conf == cscf->ctx->loc_conf) {
151 /* skipping location rewrite phase for server null location */
152 return NGX_DECLINED;
153 }
154
155 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_rewrite_module);
156
157 if (rlcf->codes == NULL) {
158 return NGX_DECLINED;
159 }
160
161 e = ngx_pcalloc(r->pool, sizeof(ngx_http_script_engine_t));
162 if (e == NULL) {
163 return NGX_HTTP_INTERNAL_SERVER_ERROR;
164 }
165
166 e->sp = ngx_pcalloc(r->pool,
167 rlcf->stack_size * sizeof(ngx_http_variable_value_t));
168 if (e->sp == NULL) {
169 return NGX_HTTP_INTERNAL_SERVER_ERROR;
170 }
171
172 e->ip = rlcf->codes->elts;
173 e->request = r;
174 e->quote = 1;
175 e->log = rlcf->log;
176 e->status = NGX_DECLINED;
177
178 while (*(uintptr_t *) e->ip) {
179 code = *(ngx_http_script_code_pt *) e->ip;
180 code(e);
181 }
182
183 if (e->status < NGX_HTTP_BAD_REQUEST) {
184 return e->status;
185 }
186
187 if (r->err_status == 0) {
188 return e->status;
189 }
190
191 return r->err_status;
192 }
193
194
195 static ngx_int_t
196 ngx_http_rewrite_var(ngx_http_request_t *r, ngx_http_variable_value_t *v,
197 uintptr_t data)
198 {
199 ngx_http_variable_t *var;
200 ngx_http_core_main_conf_t *cmcf;
201 ngx_http_rewrite_loc_conf_t *rlcf;
202
203 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_rewrite_module);
204
205 if (rlcf->uninitialized_variable_warn == 0) {
206 *v = ngx_http_variable_null_value;
207 return NGX_OK;
208 }
209
210 cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
211
212 var = cmcf->variables.elts;
213
214 /*
215 * the ngx_http_rewrite_module sets variables directly in r->variables,
216 * and they should be handled by ngx_http_get_indexed_variable(),
217 * so the handler is called only if the variable is not initialized
218 */
219
220 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
221 "using uninitialized \"%V\" variable", &var[data].name);
222
223 *v = ngx_http_variable_null_value;
224
225 return NGX_OK;
226 }
227
228
229 static void *
230 ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf)
231 {
232 ngx_http_rewrite_loc_conf_t *conf;
233
234 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_rewrite_loc_conf_t));
235 if (conf == NULL) {
236 return NULL;
237 }
238
239 conf->stack_size = NGX_CONF_UNSET_UINT;
240 conf->log = NGX_CONF_UNSET;
241 conf->uninitialized_variable_warn = NGX_CONF_UNSET;
242
243 return conf;
244 }
245
246
247 static char *
248 ngx_http_rewrite_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
249 {
250 ngx_http_rewrite_loc_conf_t *prev = parent;
251 ngx_http_rewrite_loc_conf_t *conf = child;
252
253 uintptr_t *code;
254
255 ngx_conf_merge_value(conf->log, prev->log, 0);
256 ngx_conf_merge_value(conf->uninitialized_variable_warn,
257 prev->uninitialized_variable_warn, 1);
258 ngx_conf_merge_uint_value(conf->stack_size, prev->stack_size, 10);
259
260 if (conf->codes == NULL) {
261 return NGX_CONF_OK;
262 }
263
264 if (conf->codes == prev->codes) {
265 return NGX_CONF_OK;
266 }
267
268 code = ngx_array_push_n(conf->codes, sizeof(uintptr_t));
269 if (code == NULL) {
270 return NGX_CONF_ERROR;
271 }
272
273 *code = (uintptr_t) NULL;
274
275 return NGX_CONF_OK;
276 }
277
278
279 static ngx_int_t
280 ngx_http_rewrite_init(ngx_conf_t *cf)
281 {
282 ngx_http_handler_pt *h;
283 ngx_http_core_main_conf_t *cmcf;
284
285 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
286
287 h = ngx_array_push(&cmcf->phases[NGX_HTTP_SERVER_REWRITE_PHASE].handlers);
288 if (h == NULL) {
289 return NGX_ERROR;
290 }
291
292 *h = ngx_http_rewrite_handler;
293
294 h = ngx_array_push(&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers);
295 if (h == NULL) {
296 return NGX_ERROR;
297 }
298
299 *h = ngx_http_rewrite_handler;
300
301 return NGX_OK;
302 }
303
304
305 static char *
306 ngx_http_rewrite(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
307 {
308 ngx_http_rewrite_loc_conf_t *lcf = conf;
309
310 ngx_str_t *value;
311 ngx_uint_t last;
312 ngx_regex_compile_t rc;
313 ngx_http_script_code_pt *code;
314 ngx_http_script_compile_t sc;
315 ngx_http_script_regex_code_t *regex;
316 ngx_http_script_regex_end_code_t *regex_end;
317 u_char errstr[NGX_MAX_CONF_ERRSTR];
318
319 regex = ngx_http_script_start_code(cf->pool, &lcf->codes,
320 sizeof(ngx_http_script_regex_code_t));
321 if (regex == NULL) {
322 return NGX_CONF_ERROR;
323 }
324
325 ngx_memzero(regex, sizeof(ngx_http_script_regex_code_t));
326
327 value = cf->args->elts;
328
329 ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
330
331 rc.pattern = value[1];
332 rc.err.len = NGX_MAX_CONF_ERRSTR;
333 rc.err.data = errstr;
334
335 /* TODO: NGX_REGEX_CASELESS */
336
337 regex->regex = ngx_http_regex_compile(cf, &rc);
338 if (regex->regex == NULL) {
339 return NGX_CONF_ERROR;
340 }
341
342 regex->code = ngx_http_script_regex_start_code;
343 regex->uri = 1;
344 regex->name = value[1];
345
346 if (value[2].data[value[2].len - 1] == '?') {
347
348 /* the last "?" drops the original arguments */
349 value[2].len--;
350
351 } else {
352 regex->add_args = 1;
353 }
354
355 last = 0;
356
357 if (ngx_strncmp(value[2].data, "http://", sizeof("http://") - 1) == 0
358 || ngx_strncmp(value[2].data, "https://", sizeof("https://") - 1) == 0
359 || ngx_strncmp(value[2].data, "$scheme", sizeof("$scheme") - 1) == 0)
360 {
361 regex->status = NGX_HTTP_MOVED_TEMPORARILY;
362 regex->redirect = 1;
363 last = 1;
364 }
365
366 if (cf->args->nelts == 4) {
367 if (ngx_strcmp(value[3].data, "last") == 0) {
368 last = 1;
369
370 } else if (ngx_strcmp(value[3].data, "break") == 0) {
371 regex->break_cycle = 1;
372 last = 1;
373
374 } else if (ngx_strcmp(value[3].data, "redirect") == 0) {
375 regex->status = NGX_HTTP_MOVED_TEMPORARILY;
376 regex->redirect = 1;
377 last = 1;
378
379 } else if (ngx_strcmp(value[3].data, "permanent") == 0) {
380 regex->status = NGX_HTTP_MOVED_PERMANENTLY;
381 regex->redirect = 1;
382 last = 1;
383
384 } else {
385 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
386 "invalid parameter \"%V\"", &value[3]);
387 return NGX_CONF_ERROR;
388 }
389 }
390
391 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
392
393 sc.cf = cf;
394 sc.source = &value[2];
395 sc.lengths = ®ex->lengths;
396 sc.values = &lcf->codes;
397 sc.variables = ngx_http_script_variables_count(&value[2]);
398 sc.main = regex;
399 sc.complete_lengths = 1;
400 sc.compile_args = !regex->redirect;
401
402 if (ngx_http_script_compile(&sc) != NGX_OK) {
403 return NGX_CONF_ERROR;
404 }
405
406 regex = sc.main;
407
408 regex->size = sc.size;
409 regex->args = sc.args;
410
411 if (sc.variables == 0 && !sc.dup_capture) {
412 regex->lengths = NULL;
413 }
414
415 regex_end = ngx_http_script_add_code(lcf->codes,
416 sizeof(ngx_http_script_regex_end_code_t),
417 ®ex);
418 if (regex_end == NULL) {
419 return NGX_CONF_ERROR;
420 }
421
422 regex_end->code = ngx_http_script_regex_end_code;
423 regex_end->uri = regex->uri;
424 regex_end->args = regex->args;
425 regex_end->add_args = regex->add_args;
426 regex_end->redirect = regex->redirect;
427
428 if (last) {
429 code = ngx_http_script_add_code(lcf->codes, sizeof(uintptr_t), ®ex);
430 if (code == NULL) {
431 return NGX_CONF_ERROR;
432 }
433
434 *code = NULL;
435 }
436
437 regex->next = (u_char *) lcf->codes->elts + lcf->codes->nelts
438 - (u_char *) regex;
439
440 return NGX_CONF_OK;
441 }
442
443
444 static char *
445 ngx_http_rewrite_return(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
446 {
447 ngx_http_rewrite_loc_conf_t *lcf = conf;
448
449 u_char *p;
450 ngx_str_t *value, *v;
451 ngx_http_script_return_code_t *ret;
452 ngx_http_compile_complex_value_t ccv;
453
454 ret = ngx_http_script_start_code(cf->pool, &lcf->codes,
455 sizeof(ngx_http_script_return_code_t));
456 if (ret == NULL) {
457 return NGX_CONF_ERROR;
458 }
459
460 value = cf->args->elts;
461
462 ngx_memzero(ret, sizeof(ngx_http_script_return_code_t));
463
464 ret->code = ngx_http_script_return_code;
465
466 p = value[1].data;
467
468 ret->status = ngx_atoi(p, value[1].len);
469
470 if (ret->status == (uintptr_t) NGX_ERROR) {
471
472 if (cf->args->nelts == 2
473 && (ngx_strncmp(p, "http://", sizeof("http://") - 1) == 0
474 || ngx_strncmp(p, "https://", sizeof("https://") - 1) == 0
475 || ngx_strncmp(p, "$scheme", sizeof("$scheme") - 1) == 0))
476 {
477 ret->status = NGX_HTTP_MOVED_TEMPORARILY;
478 v = &value[1];
479
480 } else {
481 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
482 "invalid return code \"%V\"", &value[1]);
483 return NGX_CONF_ERROR;
484 }
485
486 } else {
487
488 if (ret->status > 999) {
489 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
490 "invalid return code \"%V\"", &value[1]);
491 return NGX_CONF_ERROR;
492 }
493
494 if (cf->args->nelts == 2) {
495 return NGX_CONF_OK;
496 }
497
498 v = &value[2];
499 }
500
501 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
502
503 ccv.cf = cf;
504 ccv.value = v;
505 ccv.complex_value = &ret->text;
506
507 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
508 return NGX_CONF_ERROR;
509 }
510
511 return NGX_CONF_OK;
512 }
513
514
515 static char *
516 ngx_http_rewrite_break(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
517 {
518 ngx_http_rewrite_loc_conf_t *lcf = conf;
519
520 ngx_http_script_code_pt *code;
521
522 code = ngx_http_script_start_code(cf->pool, &lcf->codes, sizeof(uintptr_t));
523 if (code == NULL) {
524 return NGX_CONF_ERROR;
525 }
526
527 *code = ngx_http_script_break_code;
528
529 return NGX_CONF_OK;
530 }
531
532
533 static char *
534 ngx_http_rewrite_if(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
535 {
536 ngx_http_rewrite_loc_conf_t *lcf = conf;
537
538 void *mconf;
539 char *rv;
540 u_char *elts;
541 ngx_uint_t i;
542 ngx_conf_t save;
543 ngx_http_module_t *module;
544 ngx_http_conf_ctx_t *ctx, *pctx;
545 ngx_http_core_loc_conf_t *clcf, *pclcf;
546 ngx_http_script_if_code_t *if_code;
547 ngx_http_rewrite_loc_conf_t *nlcf;
548
549 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
550 if (ctx == NULL) {
551 return NGX_CONF_ERROR;
552 }
553
554 pctx = cf->ctx;
555 ctx->main_conf = pctx->main_conf;
556 ctx->srv_conf = pctx->srv_conf;
557
558 ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
559 if (ctx->loc_conf == NULL) {
560 return NGX_CONF_ERROR;
561 }
562
563 for (i = 0; ngx_modules[i]; i++) {
564 if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
565 continue;
566 }
567
568 module = ngx_modules[i]->ctx;
569
570 if (module->create_loc_conf) {
571
572 mconf = module->create_loc_conf(cf);
573 if (mconf == NULL) {
574 return NGX_CONF_ERROR;
575 }
576
577 ctx->loc_conf[ngx_modules[i]->ctx_index] = mconf;
578 }
579 }
580
581 pclcf = pctx->loc_conf[ngx_http_core_module.ctx_index];
582
583 clcf = ctx->loc_conf[ngx_http_core_module.ctx_index];
584 clcf->loc_conf = ctx->loc_conf;
585 clcf->name = pclcf->name;
586 clcf->noname = 1;
587
588 if (ngx_http_add_location(cf, &pclcf->locations, clcf) != NGX_OK) {
589 return NGX_CONF_ERROR;
590 }
591
592 if (ngx_http_rewrite_if_condition(cf, lcf) != NGX_CONF_OK) {
593 return NGX_CONF_ERROR;
594 }
595
596 if_code = ngx_array_push_n(lcf->codes, sizeof(ngx_http_script_if_code_t));
597 if (if_code == NULL) {
598 return NGX_CONF_ERROR;
599 }
600
601 if_code->code = ngx_http_script_if_code;
602
603 elts = lcf->codes->elts;
604
605
606 /* the inner directives must be compiled to the same code array */
607
608 nlcf = ctx->loc_conf[ngx_http_rewrite_module.ctx_index];
609 nlcf->codes = lcf->codes;
610
611
612 save = *cf;
613 cf->ctx = ctx;
614
615 if (pclcf->name.len == 0) {
616 if_code->loc_conf = NULL;
617 cf->cmd_type = NGX_HTTP_SIF_CONF;
618
619 } else {
620 if_code->loc_conf = ctx->loc_conf;
621 cf->cmd_type = NGX_HTTP_LIF_CONF;
622 }
623
624 rv = ngx_conf_parse(cf, NULL);
625
626 *cf = save;
627
628 if (rv != NGX_CONF_OK) {
629 return rv;
630 }
631
632
633 if (elts != lcf->codes->elts) {
634 if_code = (ngx_http_script_if_code_t *)
635 ((u_char *) if_code + ((u_char *) lcf->codes->elts - elts));
636 }
637
638 if_code->next = (u_char *) lcf->codes->elts + lcf->codes->nelts
639 - (u_char *) if_code;
640
641 /* the code array belong to parent block */
642
643 nlcf->codes = NULL;
644
645 return NGX_CONF_OK;
646 }
647
648
649 static char *
650 ngx_http_rewrite_if_condition(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf)
651 {
652 u_char *p;
653 size_t len;
654 ngx_str_t *value;
655 ngx_uint_t cur, last;
656 ngx_regex_compile_t rc;
657 ngx_http_script_code_pt *code;
658 ngx_http_script_file_code_t *fop;
659 ngx_http_script_regex_code_t *regex;
660 u_char errstr[NGX_MAX_CONF_ERRSTR];
661
662 value = cf->args->elts;
663 last = cf->args->nelts - 1;
664
665 if (value[1].len < 1 || value[1].data[0] != '(') {
666 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
667 "invalid condition \"%V\"", &value[1]);
668 return NGX_CONF_ERROR;
669 }
670
671 if (value[1].len == 1) {
672 cur = 2;
673
674 } else {
675 cur = 1;
676 value[1].len--;
677 value[1].data++;
678 }
679
680 if (value[last].len < 1 || value[last].data[value[last].len - 1] != ')') {
681 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
682 "invalid condition \"%V\"", &value[last]);
683 return NGX_CONF_ERROR;
684 }
685
686 if (value[last].len == 1) {
687 last--;
688
689 } else {
690 value[last].len--;
691 value[last].data[value[last].len] = '\0';
692 }
693
694 len = value[cur].len;
695 p = value[cur].data;
696
697 if (len > 1 && p[0] == '$') {
698
699 if (cur != last && cur + 2 != last) {
700 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
701 "invalid condition \"%V\"", &value[cur]);
702 return NGX_CONF_ERROR;
703 }
704
705 if (ngx_http_rewrite_variable(cf, lcf, &value[cur]) != NGX_CONF_OK) {
706 return NGX_CONF_ERROR;
707 }
708
709 if (cur == last) {
710 return NGX_CONF_OK;
711 }
712
713 cur++;
714
715 len = value[cur].len;
716 p = value[cur].data;
717
718 if (len == 1 && p[0] == '=') {
719
720 if (ngx_http_rewrite_value(cf, lcf, &value[last]) != NGX_CONF_OK) {
721 return NGX_CONF_ERROR;
722 }
723
724 code = ngx_http_script_start_code(cf->pool, &lcf->codes,
725 sizeof(uintptr_t));
726 if (code == NULL) {
727 return NGX_CONF_ERROR;
728 }
729
730 *code = ngx_http_script_equal_code;
731
732 return NGX_CONF_OK;
733 }
734
735 if (len == 2 && p[0] == '!' && p[1] == '=') {
736
737 if (ngx_http_rewrite_value(cf, lcf, &value[last]) != NGX_CONF_OK) {
738 return NGX_CONF_ERROR;
739 }
740
741 code = ngx_http_script_start_code(cf->pool, &lcf->codes,
742 sizeof(uintptr_t));
743 if (code == NULL) {
744 return NGX_CONF_ERROR;
745 }
746
747 *code = ngx_http_script_not_equal_code;
748 return NGX_CONF_OK;
749 }
750
751 if ((len == 1 && p[0] == '~')
752 || (len == 2 && p[0] == '~' && p[1] == '*')
753 || (len == 2 && p[0] == '!' && p[1] == '~')
754 || (len == 3 && p[0] == '!' && p[1] == '~' && p[2] == '*'))
755 {
756 regex = ngx_http_script_start_code(cf->pool, &lcf->codes,
757 sizeof(ngx_http_script_regex_code_t));
758 if (regex == NULL) {
759 return NGX_CONF_ERROR;
760 }
761
762 ngx_memzero(regex, sizeof(ngx_http_script_regex_code_t));
763
764 ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
765
766 rc.pattern = value[last];
767 rc.options = (p[len - 1] == '*') ? NGX_REGEX_CASELESS : 0;
768 rc.err.len = NGX_MAX_CONF_ERRSTR;
769 rc.err.data = errstr;
770
771 regex->regex = ngx_http_regex_compile(cf, &rc);
772 if (regex->regex == NULL) {
773 return NGX_CONF_ERROR;
774 }
775
776 regex->code = ngx_http_script_regex_start_code;
777 regex->next = sizeof(ngx_http_script_regex_code_t);
778 regex->test = 1;
779 if (p[0] == '!') {
780 regex->negative_test = 1;
781 }
782 regex->name = value[last];
783
784 return NGX_CONF_OK;
785 }
786
787 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
788 "unexpected \"%V\" in condition", &value[cur]);
789 return NGX_CONF_ERROR;
790
791 } else if ((len == 2 && p[0] == '-')
792 || (len == 3 && p[0] == '!' && p[1] == '-'))
793 {
794 if (cur + 1 != last) {
795 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
796 "invalid condition \"%V\"", &value[cur]);
797 return NGX_CONF_ERROR;
798 }
799
800 value[last].data[value[last].len] = '\0';
801 value[last].len++;
802
803 if (ngx_http_rewrite_value(cf, lcf, &value[last]) != NGX_CONF_OK) {
804 return NGX_CONF_ERROR;
805 }
806
807 fop = ngx_http_script_start_code(cf->pool, &lcf->codes,
808 sizeof(ngx_http_script_file_code_t));
809 if (fop == NULL) {
810 return NGX_CONF_ERROR;
811 }
812
813 fop->code = ngx_http_script_file_code;
814
815 if (p[1] == 'f') {
816 fop->op = ngx_http_script_file_plain;
817 return NGX_CONF_OK;
818 }
819
820 if (p[1] == 'd') {
821 fop->op = ngx_http_script_file_dir;
822 return NGX_CONF_OK;
823 }
824
825 if (p[1] == 'e') {
826 fop->op = ngx_http_script_file_exists;
827 return NGX_CONF_OK;
828 }
829
830 if (p[1] == 'x') {
831 fop->op = ngx_http_script_file_exec;
832 return NGX_CONF_OK;
833 }
834
835 if (p[0] == '!') {
836 if (p[2] == 'f') {
837 fop->op = ngx_http_script_file_not_plain;
838 return NGX_CONF_OK;
839 }
840
841 if (p[2] == 'd') {
842 fop->op = ngx_http_script_file_not_dir;
843 return NGX_CONF_OK;
844 }
845
846 if (p[2] == 'e') {
847 fop->op = ngx_http_script_file_not_exists;
848 return NGX_CONF_OK;
849 }
850
851 if (p[2] == 'x') {
852 fop->op = ngx_http_script_file_not_exec;
853 return NGX_CONF_OK;
854 }
855 }
856
857 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
858 "invalid condition \"%V\"", &value[cur]);
859 return NGX_CONF_ERROR;
860 }
861
862 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
863 "invalid condition \"%V\"", &value[cur]);
864
865 return NGX_CONF_ERROR;
866 }
867
868
869 static char *
870 ngx_http_rewrite_variable(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf,
871 ngx_str_t *value)
872 {
873 ngx_int_t index;
874 ngx_http_script_var_code_t *var_code;
875
876 value->len--;
877 value->data++;
878
879 index = ngx_http_get_variable_index(cf, value);
880
881 if (index == NGX_ERROR) {
882 return NGX_CONF_ERROR;
883 }
884
885 var_code = ngx_http_script_start_code(cf->pool, &lcf->codes,
886 sizeof(ngx_http_script_var_code_t));
887 if (var_code == NULL) {
888 return NGX_CONF_ERROR;
889 }
890
891 var_code->code = ngx_http_script_var_code;
892 var_code->index = index;
893
894 return NGX_CONF_OK;
895 }
896
897
898 static char *
899 ngx_http_rewrite_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
900 {
901 ngx_http_rewrite_loc_conf_t *lcf = conf;
902
903 ngx_int_t index;
904 ngx_str_t *value;
905 ngx_http_variable_t *v;
906 ngx_http_script_var_code_t *vcode;
907 ngx_http_script_var_handler_code_t *vhcode;
908
909 value = cf->args->elts;
910
911 if (value[1].data[0] != '$') {
912 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
913 "invalid variable name \"%V\"", &value[1]);
914 return NGX_CONF_ERROR;
915 }
916
917 value[1].len--;
918 value[1].data++;
919
920 v = ngx_http_add_variable(cf, &value[1], NGX_HTTP_VAR_CHANGEABLE);
921 if (v == NULL) {
922 return NGX_CONF_ERROR;
923 }
924
925 index = ngx_http_get_variable_index(cf, &value[1]);
926 if (index == NGX_ERROR) {
927 return NGX_CONF_ERROR;
928 }
929
930 if (v->get_handler == NULL
931 && ngx_strncasecmp(value[1].data, (u_char *) "http_", 5) != 0
932 && ngx_strncasecmp(value[1].data, (u_char *) "sent_http_", 10) != 0
933 && ngx_strncasecmp(value[1].data, (u_char *) "upstream_http_", 14) != 0)
934 {
935 v->get_handler = ngx_http_rewrite_var;
936 v->data = index;
937 }
938
939 if (ngx_http_rewrite_value(cf, lcf, &value[2]) != NGX_CONF_OK) {
940 return NGX_CONF_ERROR;
941 }
942
943 if (v->set_handler) {
944 vhcode = ngx_http_script_start_code(cf->pool, &lcf->codes,
945 sizeof(ngx_http_script_var_handler_code_t));
946 if (vhcode == NULL) {
947 return NGX_CONF_ERROR;
948 }
949
950 vhcode->code = ngx_http_script_var_set_handler_code;
951 vhcode->handler = v->set_handler;
952 vhcode->data = v->data;
953
954 return NGX_CONF_OK;
955 }
956
957 vcode = ngx_http_script_start_code(cf->pool, &lcf->codes,
958 sizeof(ngx_http_script_var_code_t));
959 if (vcode == NULL) {
960 return NGX_CONF_ERROR;
961 }
962
963 vcode->code = ngx_http_script_set_var_code;
964 vcode->index = (uintptr_t) index;
965
966 return NGX_CONF_OK;
967 }
968
969
970 static char *
971 ngx_http_rewrite_value(ngx_conf_t *cf, ngx_http_rewrite_loc_conf_t *lcf,
972 ngx_str_t *value)
973 {
974 ngx_int_t n;
975 ngx_http_script_compile_t sc;
976 ngx_http_script_value_code_t *val;
977 ngx_http_script_complex_value_code_t *complex;
978
979 n = ngx_http_script_variables_count(value);
980
981 if (n == 0) {
982 val = ngx_http_script_start_code(cf->pool, &lcf->codes,
983 sizeof(ngx_http_script_value_code_t));
984 if (val == NULL) {
985 return NGX_CONF_ERROR;
986 }
987
988 n = ngx_atoi(value->data, value->len);
989
990 if (n == NGX_ERROR) {
991 n = 0;
992 }
993
994 val->code = ngx_http_script_value_code;
995 val->value = (uintptr_t) n;
996 val->text_len = (uintptr_t) value->len;
997 val->text_data = (uintptr_t) value->data;
998
999 return NGX_CONF_OK;
1000 }
1001
1002 complex = ngx_http_script_start_code(cf->pool, &lcf->codes,
1003 sizeof(ngx_http_script_complex_value_code_t));
1004 if (complex == NULL) {
1005 return NGX_CONF_ERROR;
1006 }
1007
1008 complex->code = ngx_http_script_complex_value_code;
1009 complex->lengths = NULL;
1010
1011 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
1012
1013 sc.cf = cf;
1014 sc.source = value;
1015 sc.lengths = &complex->lengths;
1016 sc.values = &lcf->codes;
1017 sc.variables = n;
1018 sc.complete_lengths = 1;
1019
1020 if (ngx_http_script_compile(&sc) != NGX_OK) {
1021 return NGX_CONF_ERROR;
1022 }
1023
1024 return NGX_CONF_OK;
1025 }
1026
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