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ngx_http_userid_filter_module.c
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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 #define NGX_HTTP_USERID_OFF 0
14 #define NGX_HTTP_USERID_LOG 1
15 #define NGX_HTTP_USERID_V1 2
16 #define NGX_HTTP_USERID_ON 3
17 
18 /* 31 Dec 2037 23:55:55 GMT */
19 #define NGX_HTTP_USERID_MAX_EXPIRES 2145916555
20 
21 
22 typedef struct {
23  ngx_uint_t enable;
24 
25  ngx_int_t service;
26 
27  ngx_str_t name;
28  ngx_str_t domain;
29  ngx_str_t path;
30  ngx_str_t p3p;
31 
32  time_t expires;
33 
34  u_char mark;
35 } ngx_http_userid_conf_t;
36 
37 
38 typedef struct {
39  uint32_t uid_got[4];
40  uint32_t uid_set[4];
41  ngx_str_t cookie;
42  ngx_uint_t reset;
43 } ngx_http_userid_ctx_t;
44 
45 
46 static ngx_http_userid_ctx_t *ngx_http_userid_get_uid(ngx_http_request_t *r,
47  ngx_http_userid_conf_t *conf);
48 static ngx_int_t ngx_http_userid_variable(ngx_http_request_t *r,
49  ngx_http_variable_value_t *v, ngx_str_t *name, uint32_t *uid);
50 static ngx_int_t ngx_http_userid_set_uid(ngx_http_request_t *r,
51  ngx_http_userid_ctx_t *ctx, ngx_http_userid_conf_t *conf);
52 static ngx_int_t ngx_http_userid_create_uid(ngx_http_request_t *r,
53  ngx_http_userid_ctx_t *ctx, ngx_http_userid_conf_t *conf);
54 
55 static ngx_int_t ngx_http_userid_add_variables(ngx_conf_t *cf);
56 static ngx_int_t ngx_http_userid_init(ngx_conf_t *cf);
57 static void *ngx_http_userid_create_conf(ngx_conf_t *cf);
58 static char *ngx_http_userid_merge_conf(ngx_conf_t *cf, void *parent,
59  void *child);
60 static char *ngx_http_userid_domain(ngx_conf_t *cf, void *post, void *data);
61 static char *ngx_http_userid_path(ngx_conf_t *cf, void *post, void *data);
62 static char *ngx_http_userid_expires(ngx_conf_t *cf, ngx_command_t *cmd,
63  void *conf);
64 static char *ngx_http_userid_p3p(ngx_conf_t *cf, void *post, void *data);
65 static char *ngx_http_userid_mark(ngx_conf_t *cf, ngx_command_t *cmd,
66  void *conf);
67 static ngx_int_t ngx_http_userid_init_worker(ngx_cycle_t *cycle);
68 
69 
70 
71 static uint32_t start_value;
72 static uint32_t sequencer_v1 = 1;
73 static uint32_t sequencer_v2 = 0x03030302;
74 
75 
76 static u_char expires[] = "; expires=Thu, 31-Dec-37 23:55:55 GMT";
77 
78 
79 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
80 
81 
82 static ngx_conf_enum_t ngx_http_userid_state[] = {
83  { ngx_string("off"), NGX_HTTP_USERID_OFF },
84  { ngx_string("log"), NGX_HTTP_USERID_LOG },
85  { ngx_string("v1"), NGX_HTTP_USERID_V1 },
86  { ngx_string("on"), NGX_HTTP_USERID_ON },
87  { ngx_null_string, 0 }
88 };
89 
90 
91 static ngx_conf_post_handler_pt ngx_http_userid_domain_p =
92  ngx_http_userid_domain;
93 static ngx_conf_post_handler_pt ngx_http_userid_path_p = ngx_http_userid_path;
94 static ngx_conf_post_handler_pt ngx_http_userid_p3p_p = ngx_http_userid_p3p;
95 
96 
97 static ngx_command_t ngx_http_userid_commands[] = {
98 
99  { ngx_string("userid"),
100  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
101  ngx_conf_set_enum_slot,
102  NGX_HTTP_LOC_CONF_OFFSET,
103  offsetof(ngx_http_userid_conf_t, enable),
104  ngx_http_userid_state },
105 
106  { ngx_string("userid_service"),
107  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
108  ngx_conf_set_num_slot,
109  NGX_HTTP_LOC_CONF_OFFSET,
110  offsetof(ngx_http_userid_conf_t, service),
111  NULL },
112 
113  { ngx_string("userid_name"),
114  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
115  ngx_conf_set_str_slot,
116  NGX_HTTP_LOC_CONF_OFFSET,
117  offsetof(ngx_http_userid_conf_t, name),
118  NULL },
119 
120  { ngx_string("userid_domain"),
121  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
122  ngx_conf_set_str_slot,
123  NGX_HTTP_LOC_CONF_OFFSET,
124  offsetof(ngx_http_userid_conf_t, domain),
125  &ngx_http_userid_domain_p },
126 
127  { ngx_string("userid_path"),
128  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
129  ngx_conf_set_str_slot,
130  NGX_HTTP_LOC_CONF_OFFSET,
131  offsetof(ngx_http_userid_conf_t, path),
132  &ngx_http_userid_path_p },
133 
134  { ngx_string("userid_expires"),
135  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
136  ngx_http_userid_expires,
137  NGX_HTTP_LOC_CONF_OFFSET,
138  0,
139  NULL },
140 
141  { ngx_string("userid_p3p"),
142  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
143  ngx_conf_set_str_slot,
144  NGX_HTTP_LOC_CONF_OFFSET,
145  offsetof(ngx_http_userid_conf_t, p3p),
146  &ngx_http_userid_p3p_p },
147 
148  { ngx_string("userid_mark"),
149  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
150  ngx_http_userid_mark,
151  NGX_HTTP_LOC_CONF_OFFSET,
152  0,
153  NULL },
154 
155  ngx_null_command
156 };
157 
158 
159 static ngx_http_module_t ngx_http_userid_filter_module_ctx = {
160  ngx_http_userid_add_variables, /* preconfiguration */
161  ngx_http_userid_init, /* postconfiguration */
162 
163  NULL, /* create main configuration */
164  NULL, /* init main configuration */
165 
166  NULL, /* create server configuration */
167  NULL, /* merge server configuration */
168 
169  ngx_http_userid_create_conf, /* create location configuration */
170  ngx_http_userid_merge_conf /* merge location configuration */
171 };
172 
173 
174 ngx_module_t ngx_http_userid_filter_module = {
175  NGX_MODULE_V1,
176  &ngx_http_userid_filter_module_ctx, /* module context */
177  ngx_http_userid_commands, /* module directives */
178  NGX_HTTP_MODULE, /* module type */
179  NULL, /* init master */
180  NULL, /* init module */
181  ngx_http_userid_init_worker, /* init process */
182  NULL, /* init thread */
183  NULL, /* exit thread */
184  NULL, /* exit process */
185  NULL, /* exit master */
186  NGX_MODULE_V1_PADDING
187 };
188 
189 
190 static ngx_str_t ngx_http_userid_got = ngx_string("uid_got");
191 static ngx_str_t ngx_http_userid_set = ngx_string("uid_set");
192 static ngx_str_t ngx_http_userid_reset = ngx_string("uid_reset");
193 static ngx_uint_t ngx_http_userid_reset_index;
194 
195 
196 static ngx_int_t
197 ngx_http_userid_filter(ngx_http_request_t *r)
198 {
199  ngx_http_userid_ctx_t *ctx;
200  ngx_http_userid_conf_t *conf;
201 
202  if (r != r->main) {
203  return ngx_http_next_header_filter(r);
204  }
205 
206  conf = ngx_http_get_module_loc_conf(r, ngx_http_userid_filter_module);
207 
208  if (conf->enable < NGX_HTTP_USERID_V1) {
209  return ngx_http_next_header_filter(r);
210  }
211 
212  ctx = ngx_http_userid_get_uid(r, conf);
213 
214  if (ctx == NULL) {
215  return NGX_ERROR;
216  }
217 
218  if (ngx_http_userid_set_uid(r, ctx, conf) == NGX_OK) {
219  return ngx_http_next_header_filter(r);
220  }
221 
222  return NGX_ERROR;
223 }
224 
225 
226 static ngx_int_t
227 ngx_http_userid_got_variable(ngx_http_request_t *r,
228  ngx_http_variable_value_t *v, uintptr_t data)
229 {
230  ngx_http_userid_ctx_t *ctx;
231  ngx_http_userid_conf_t *conf;
232 
233  conf = ngx_http_get_module_loc_conf(r->main, ngx_http_userid_filter_module);
234 
235  if (conf->enable == NGX_HTTP_USERID_OFF) {
236  v->not_found = 1;
237  return NGX_OK;
238  }
239 
240  ctx = ngx_http_userid_get_uid(r->main, conf);
241 
242  if (ctx == NULL) {
243  return NGX_ERROR;
244  }
245 
246  if (ctx->uid_got[3] != 0) {
247  return ngx_http_userid_variable(r->main, v, &conf->name, ctx->uid_got);
248  }
249 
250  v->not_found = 1;
251 
252  return NGX_OK;
253 }
254 
255 
256 static ngx_int_t
257 ngx_http_userid_set_variable(ngx_http_request_t *r,
258  ngx_http_variable_value_t *v, uintptr_t data)
259 {
260  ngx_http_userid_ctx_t *ctx;
261  ngx_http_userid_conf_t *conf;
262 
263  conf = ngx_http_get_module_loc_conf(r->main, ngx_http_userid_filter_module);
264 
265  if (conf->enable < NGX_HTTP_USERID_V1) {
266  v->not_found = 1;
267  return NGX_OK;
268  }
269 
270  ctx = ngx_http_userid_get_uid(r->main, conf);
271 
272  if (ctx == NULL) {
273  return NGX_ERROR;
274  }
275 
276  if (ngx_http_userid_create_uid(r->main, ctx, conf) != NGX_OK) {
277  return NGX_ERROR;
278  }
279 
280  if (ctx->uid_set[3] == 0) {
281  v->not_found = 1;
282  return NGX_OK;
283  }
284 
285  return ngx_http_userid_variable(r->main, v, &conf->name, ctx->uid_set);
286 }
287 
288 
289 static ngx_http_userid_ctx_t *
290 ngx_http_userid_get_uid(ngx_http_request_t *r, ngx_http_userid_conf_t *conf)
291 {
292  ngx_int_t n;
293  ngx_str_t src, dst;
294  ngx_table_elt_t **cookies;
295  ngx_http_userid_ctx_t *ctx;
296 
297  ctx = ngx_http_get_module_ctx(r, ngx_http_userid_filter_module);
298 
299  if (ctx) {
300  return ctx;
301  }
302 
303  if (ctx == NULL) {
304  ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_userid_ctx_t));
305  if (ctx == NULL) {
306  return NULL;
307  }
308 
309  ngx_http_set_ctx(r, ctx, ngx_http_userid_filter_module);
310  }
311 
312  n = ngx_http_parse_multi_header_lines(&r->headers_in.cookies, &conf->name,
313  &ctx->cookie);
314  if (n == NGX_DECLINED) {
315  return ctx;
316  }
317 
318  ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
319  "uid cookie: \"%V\"", &ctx->cookie);
320 
321  if (ctx->cookie.len < 22) {
322  cookies = r->headers_in.cookies.elts;
323  ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
324  "client sent too short userid cookie \"%V\"",
325  &cookies[n]->value);
326  return ctx;
327  }
328 
329  src = ctx->cookie;
330 
331  /*
332  * we have to limit the encoded string to 22 characters because
333  * 1) cookie may be marked by "userid_mark",
334  * 2) and there are already the millions cookies with a garbage
335  * instead of the correct base64 trail "=="
336  */
337 
338  src.len = 22;
339 
340  dst.data = (u_char *) ctx->uid_got;
341 
342  if (ngx_decode_base64(&dst, &src) == NGX_ERROR) {
343  cookies = r->headers_in.cookies.elts;
344  ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
345  "client sent invalid userid cookie \"%V\"",
346  &cookies[n]->value);
347  return ctx;
348  }
349 
350  ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
351  "uid: %08XD%08XD%08XD%08XD",
352  ctx->uid_got[0], ctx->uid_got[1],
353  ctx->uid_got[2], ctx->uid_got[3]);
354 
355  return ctx;
356 }
357 
358 
359 static ngx_int_t
360 ngx_http_userid_set_uid(ngx_http_request_t *r, ngx_http_userid_ctx_t *ctx,
361  ngx_http_userid_conf_t *conf)
362 {
363  u_char *cookie, *p;
364  size_t len;
365  ngx_str_t src, dst;
366  ngx_table_elt_t *set_cookie, *p3p;
367 
368  if (ngx_http_userid_create_uid(r, ctx, conf) != NGX_OK) {
369  return NGX_ERROR;
370  }
371 
372  if (ctx->uid_set[3] == 0) {
373  return NGX_OK;
374  }
375 
376  len = conf->name.len + 1 + ngx_base64_encoded_length(16) + conf->path.len;
377 
378  if (conf->expires) {
379  len += sizeof(expires) - 1 + 2;
380  }
381 
382  if (conf->domain.len) {
383  len += conf->domain.len;
384  }
385 
386  cookie = ngx_pnalloc(r->pool, len);
387  if (cookie == NULL) {
388  return NGX_ERROR;
389  }
390 
391  p = ngx_copy(cookie, conf->name.data, conf->name.len);
392  *p++ = '=';
393 
394  if (ctx->uid_got[3] == 0 || ctx->reset) {
395  src.len = 16;
396  src.data = (u_char *) ctx->uid_set;
397  dst.data = p;
398 
399  ngx_encode_base64(&dst, &src);
400 
401  p += dst.len;
402 
403  if (conf->mark) {
404  *(p - 2) = conf->mark;
405  }
406 
407  } else {
408  p = ngx_cpymem(p, ctx->cookie.data, 22);
409  *p++ = conf->mark;
410  *p++ = '=';
411  }
412 
413  if (conf->expires == NGX_HTTP_USERID_MAX_EXPIRES) {
414  p = ngx_cpymem(p, expires, sizeof(expires) - 1);
415 
416  } else if (conf->expires) {
417  p = ngx_cpymem(p, expires, sizeof("; expires=") - 1);
418  p = ngx_http_cookie_time(p, ngx_time() + conf->expires);
419  }
420 
421  p = ngx_copy(p, conf->domain.data, conf->domain.len);
422 
423  p = ngx_copy(p, conf->path.data, conf->path.len);
424 
425  set_cookie = ngx_list_push(&r->headers_out.headers);
426  if (set_cookie == NULL) {
427  return NGX_ERROR;
428  }
429 
430  set_cookie->hash = 1;
431  ngx_str_set(&set_cookie->key, "Set-Cookie");
432  set_cookie->value.len = p - cookie;
433  set_cookie->value.data = cookie;
434 
435  ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
436  "uid cookie: \"%V\"", &set_cookie->value);
437 
438  if (conf->p3p.len == 0) {
439  return NGX_OK;
440  }
441 
442  p3p = ngx_list_push(&r->headers_out.headers);
443  if (p3p == NULL) {
444  return NGX_ERROR;
445  }
446 
447  p3p->hash = 1;
448  ngx_str_set(&p3p->key, "P3P");
449  p3p->value = conf->p3p;
450 
451  return NGX_OK;
452 }
453 
454 
455 static ngx_int_t
456 ngx_http_userid_create_uid(ngx_http_request_t *r, ngx_http_userid_ctx_t *ctx,
457  ngx_http_userid_conf_t *conf)
458 {
459  ngx_connection_t *c;
460  struct sockaddr_in *sin;
461  ngx_http_variable_value_t *vv;
462 #if (NGX_HAVE_INET6)
463  u_char *p;
464  struct sockaddr_in6 *sin6;
465 #endif
466 
467  if (ctx->uid_set[3] != 0) {
468  return NGX_OK;
469  }
470 
471  if (ctx->uid_got[3] != 0) {
472 
473  vv = ngx_http_get_indexed_variable(r, ngx_http_userid_reset_index);
474 
475  if (vv->len == 0 || (vv->len == 1 && vv->data[0] == '0')) {
476 
477  if (conf->mark == '\0'
478  || (ctx->cookie.len > 23
479  && ctx->cookie.data[22] == conf->mark
480  && ctx->cookie.data[23] == '='))
481  {
482  return NGX_OK;
483  }
484 
485  ctx->uid_set[0] = ctx->uid_got[0];
486  ctx->uid_set[1] = ctx->uid_got[1];
487  ctx->uid_set[2] = ctx->uid_got[2];
488  ctx->uid_set[3] = ctx->uid_got[3];
489 
490  return NGX_OK;
491 
492  } else {
493  ctx->reset = 1;
494 
495  if (vv->len == 3 && ngx_strncmp(vv->data, "log", 3) == 0) {
496  ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
497  "userid cookie \"%V=%08XD%08XD%08XD%08XD\" was reset",
498  &conf->name, ctx->uid_got[0], ctx->uid_got[1],
499  ctx->uid_got[2], ctx->uid_got[3]);
500  }
501  }
502  }
503 
504  /*
505  * TODO: in the threaded mode the sequencers should be in TLS and their
506  * ranges should be divided between threads
507  */
508 
509  if (conf->enable == NGX_HTTP_USERID_V1) {
510  if (conf->service == NGX_CONF_UNSET) {
511  ctx->uid_set[0] = 0;
512  } else {
513  ctx->uid_set[0] = conf->service;
514  }
515  ctx->uid_set[1] = (uint32_t) ngx_time();
516  ctx->uid_set[2] = start_value;
517  ctx->uid_set[3] = sequencer_v1;
518  sequencer_v1 += 0x100;
519 
520  } else {
521  if (conf->service == NGX_CONF_UNSET) {
522 
523  c = r->connection;
524 
525  if (ngx_connection_local_sockaddr(c, NULL, 0) != NGX_OK) {
526  return NGX_ERROR;
527  }
528 
529  switch (c->local_sockaddr->sa_family) {
530 
531 #if (NGX_HAVE_INET6)
532  case AF_INET6:
533  sin6 = (struct sockaddr_in6 *) c->local_sockaddr;
534 
535  p = (u_char *) &ctx->uid_set[0];
536 
537  *p++ = sin6->sin6_addr.s6_addr[12];
538  *p++ = sin6->sin6_addr.s6_addr[13];
539  *p++ = sin6->sin6_addr.s6_addr[14];
540  *p = sin6->sin6_addr.s6_addr[15];
541 
542  break;
543 #endif
544  default: /* AF_INET */
545  sin = (struct sockaddr_in *) c->local_sockaddr;
546  ctx->uid_set[0] = sin->sin_addr.s_addr;
547  break;
548  }
549 
550  } else {
551  ctx->uid_set[0] = htonl(conf->service);
552  }
553 
554  ctx->uid_set[1] = htonl((uint32_t) ngx_time());
555  ctx->uid_set[2] = htonl(start_value);
556  ctx->uid_set[3] = htonl(sequencer_v2);
557  sequencer_v2 += 0x100;
558  if (sequencer_v2 < 0x03030302) {
559  sequencer_v2 = 0x03030302;
560  }
561  }
562 
563  return NGX_OK;
564 }
565 
566 
567 static ngx_int_t
568 ngx_http_userid_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
569  ngx_str_t *name, uint32_t *uid)
570 {
571  v->len = name->len + sizeof("=00001111222233334444555566667777") - 1;
572  v->data = ngx_pnalloc(r->pool, v->len);
573  if (v->data == NULL) {
574  return NGX_ERROR;
575  }
576 
577  v->valid = 1;
578  v->no_cacheable = 0;
579  v->not_found = 0;
580 
581  ngx_sprintf(v->data, "%V=%08XD%08XD%08XD%08XD",
582  name, uid[0], uid[1], uid[2], uid[3]);
583 
584  return NGX_OK;
585 }
586 
587 
588 static ngx_int_t
589 ngx_http_userid_reset_variable(ngx_http_request_t *r,
590  ngx_http_variable_value_t *v, uintptr_t data)
591 {
592  *v = ngx_http_variable_null_value;
593 
594  return NGX_OK;
595 }
596 
597 
598 static ngx_int_t
599 ngx_http_userid_add_variables(ngx_conf_t *cf)
600 {
601  ngx_int_t n;
602  ngx_http_variable_t *var;
603 
604  var = ngx_http_add_variable(cf, &ngx_http_userid_got, 0);
605  if (var == NULL) {
606  return NGX_ERROR;
607  }
608 
609  var->get_handler = ngx_http_userid_got_variable;
610 
611  var = ngx_http_add_variable(cf, &ngx_http_userid_set, 0);
612  if (var == NULL) {
613  return NGX_ERROR;
614  }
615 
616  var->get_handler = ngx_http_userid_set_variable;
617 
618  var = ngx_http_add_variable(cf, &ngx_http_userid_reset,
619  NGX_HTTP_VAR_CHANGEABLE);
620  if (var == NULL) {
621  return NGX_ERROR;
622  }
623 
624  var->get_handler = ngx_http_userid_reset_variable;
625 
626  n = ngx_http_get_variable_index(cf, &ngx_http_userid_reset);
627  if (n == NGX_ERROR) {
628  return NGX_ERROR;
629  }
630 
631  ngx_http_userid_reset_index = n;
632 
633  return NGX_OK;
634 }
635 
636 
637 static void *
638 ngx_http_userid_create_conf(ngx_conf_t *cf)
639 {
640  ngx_http_userid_conf_t *conf;
641 
642  conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_userid_conf_t));
643  if (conf == NULL) {
644  return NULL;
645  }
646 
647  /*
648  * set by ngx_pcalloc():
649  *
650  * conf->name = { 0, NULL };
651  * conf->domain = { 0, NULL };
652  * conf->path = { 0, NULL };
653  * conf->p3p = { 0, NULL };
654  */
655 
656  conf->enable = NGX_CONF_UNSET_UINT;
657  conf->service = NGX_CONF_UNSET;
658  conf->expires = NGX_CONF_UNSET;
659  conf->mark = (u_char) '\xFF';
660 
661  return conf;
662 }
663 
664 
665 static char *
666 ngx_http_userid_merge_conf(ngx_conf_t *cf, void *parent, void *child)
667 {
668  ngx_http_userid_conf_t *prev = parent;
669  ngx_http_userid_conf_t *conf = child;
670 
671  ngx_conf_merge_uint_value(conf->enable, prev->enable,
672  NGX_HTTP_USERID_OFF);
673 
674  ngx_conf_merge_str_value(conf->name, prev->name, "uid");
675  ngx_conf_merge_str_value(conf->domain, prev->domain, "");
676  ngx_conf_merge_str_value(conf->path, prev->path, "; path=/");
677  ngx_conf_merge_str_value(conf->p3p, prev->p3p, "");
678 
679  ngx_conf_merge_value(conf->service, prev->service, NGX_CONF_UNSET);
680  ngx_conf_merge_sec_value(conf->expires, prev->expires, 0);
681 
682  if (conf->mark == (u_char) '\xFF') {
683  if (prev->mark == (u_char) '\xFF') {
684  conf->mark = '\0';
685  } else {
686  conf->mark = prev->mark;
687  }
688  }
689 
690  return NGX_CONF_OK;
691 }
692 
693 
694 static ngx_int_t
695 ngx_http_userid_init(ngx_conf_t *cf)
696 {
697  ngx_http_next_header_filter = ngx_http_top_header_filter;
698  ngx_http_top_header_filter = ngx_http_userid_filter;
699 
700  return NGX_OK;
701 }
702 
703 
704 static char *
705 ngx_http_userid_domain(ngx_conf_t *cf, void *post, void *data)
706 {
707  ngx_str_t *domain = data;
708 
709  u_char *p, *new;
710 
711  if (ngx_strcmp(domain->data, "none") == 0) {
712  ngx_str_set(domain, "");
713  return NGX_CONF_OK;
714  }
715 
716  new = ngx_pnalloc(cf->pool, sizeof("; domain=") - 1 + domain->len);
717  if (new == NULL) {
718  return NGX_CONF_ERROR;
719  }
720 
721  p = ngx_cpymem(new, "; domain=", sizeof("; domain=") - 1);
722  ngx_memcpy(p, domain->data, domain->len);
723 
724  domain->len += sizeof("; domain=") - 1;
725  domain->data = new;
726 
727  return NGX_CONF_OK;
728 }
729 
730 
731 static char *
732 ngx_http_userid_path(ngx_conf_t *cf, void *post, void *data)
733 {
734  ngx_str_t *path = data;
735 
736  u_char *p, *new;
737 
738  new = ngx_pnalloc(cf->pool, sizeof("; path=") - 1 + path->len);
739  if (new == NULL) {
740  return NGX_CONF_ERROR;
741  }
742 
743  p = ngx_cpymem(new, "; path=", sizeof("; path=") - 1);
744  ngx_memcpy(p, path->data, path->len);
745 
746  path->len += sizeof("; path=") - 1;
747  path->data = new;
748 
749  return NGX_CONF_OK;
750 }
751 
752 
753 static char *
754 ngx_http_userid_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
755 {
756  ngx_http_userid_conf_t *ucf = conf;
757 
758  ngx_str_t *value;
759 
760  if (ucf->expires != NGX_CONF_UNSET) {
761  return "is duplicate";
762  }
763 
764  value = cf->args->elts;
765 
766  if (ngx_strcmp(value[1].data, "max") == 0) {
767  ucf->expires = NGX_HTTP_USERID_MAX_EXPIRES;
768  return NGX_CONF_OK;
769  }
770 
771  if (ngx_strcmp(value[1].data, "off") == 0) {
772  ucf->expires = 0;
773  return NGX_CONF_OK;
774  }
775 
776  ucf->expires = ngx_parse_time(&value[1], 1);
777  if (ucf->expires == (time_t) NGX_ERROR) {
778  return "invalid value";
779  }
780 
781  return NGX_CONF_OK;
782 }
783 
784 
785 static char *
786 ngx_http_userid_p3p(ngx_conf_t *cf, void *post, void *data)
787 {
788  ngx_str_t *p3p = data;
789 
790  if (ngx_strcmp(p3p->data, "none") == 0) {
791  ngx_str_set(p3p, "");
792  }
793 
794  return NGX_CONF_OK;
795 }
796 
797 
798 static char *
799 ngx_http_userid_mark(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
800 {
801  ngx_http_userid_conf_t *ucf = conf;
802 
803  ngx_str_t *value;
804 
805  if (ucf->mark != (u_char) '\xFF') {
806  return "is duplicate";
807  }
808 
809  value = cf->args->elts;
810 
811  if (ngx_strcmp(value[1].data, "off") == 0) {
812  ucf->mark = '\0';
813  return NGX_CONF_OK;
814  }
815 
816  if (value[1].len != 1
817  || !((value[1].data[0] >= '0' && value[1].data[0] <= '9')
818  || (value[1].data[0] >= 'A' && value[1].data[0] <= 'Z')
819  || (value[1].data[0] >= 'a' && value[1].data[0] <= 'z')
820  || value[1].data[0] == '='))
821  {
822  return "value must be \"off\" or a single letter, digit or \"=\"";
823  }
824 
825  ucf->mark = value[1].data[0];
826 
827  return NGX_CONF_OK;
828 }
829 
830 
831 static ngx_int_t
832 ngx_http_userid_init_worker(ngx_cycle_t *cycle)
833 {
834  struct timeval tp;
835 
836  ngx_gettimeofday(&tp);
837 
838  /* use the most significant usec part that fits to 16 bits */
839  start_value = ((tp.tv_usec / 20) << 16) | ngx_pid;
840 
841  return NGX_OK;
842 }
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