nginx/src/http/modules/ngx_http_userid_filter_module.c

   1
   2 /*
   3  * Copyright (C) Igor Sysoev
   4  */
   5
   6
   7 #include <ngx_config.h>
   8 #include <ngx_core.h>
   9 #include <ngx_http.h>
  10
  11
  12 #define NGX_HTTP_USERID_OFF   0
  13 #define NGX_HTTP_USERID_LOG   1
  14 #define NGX_HTTP_USERID_V1    2
  15 #define NGX_HTTP_USERID_ON    3
  16
  17 /* 31 Dec 2037 23:55:55 GMT */
  18 #define NGX_HTTP_USERID_MAX_EXPIRES  2145916555
  19
  20
  21 typedef struct {
  22     ngx_uint_t  enable;
  23
  24     ngx_int_t   service;
  25
  26     ngx_str_t   name;
  27     ngx_str_t   domain;
  28     ngx_str_t   path;
  29     ngx_str_t   p3p;
  30
  31     time_t      expires;
  32
  33     u_char      mark;
  34 } ngx_http_userid_conf_t;
  35
  36
  37 typedef struct {
  38     uint32_t    uid_got[4];
  39     uint32_t    uid_set[4];
  40     ngx_str_t   cookie;
  41 } ngx_http_userid_ctx_t;
  42
  43
  44 static ngx_http_userid_ctx_t *ngx_http_userid_get_uid(ngx_http_request_t *r,
  45     ngx_http_userid_conf_t *conf);
  46 static ngx_int_t ngx_http_userid_variable(ngx_http_request_t *r,
  47     ngx_http_variable_value_t *v, ngx_str_t *name, uint32_t *uid);
  48 static ngx_int_t ngx_http_userid_set_uid(ngx_http_request_t *r,
  49     ngx_http_userid_ctx_t *ctx, ngx_http_userid_conf_t *conf);
  50
  51 static ngx_int_t ngx_http_userid_add_variables(ngx_conf_t *cf);
  52 static ngx_int_t ngx_http_userid_init(ngx_conf_t *cf);
  53 static void *ngx_http_userid_create_conf(ngx_conf_t *cf);
  54 static char *ngx_http_userid_merge_conf(ngx_conf_t *cf, void *parent,
  55     void *child);
  56 static char *ngx_http_userid_domain(ngx_conf_t *cf, void *post, void *data);
  57 static char *ngx_http_userid_path(ngx_conf_t *cf, void *post, void *data);
  58 static char *ngx_http_userid_expires(ngx_conf_t *cf, ngx_command_t *cmd,
  59     void *conf);
  60 static char *ngx_http_userid_p3p(ngx_conf_t *cf, void *post, void *data);
  61 static char *ngx_http_userid_mark(ngx_conf_t *cf, ngx_command_t *cmd,
  62     void *conf);
  63 static ngx_int_t ngx_http_userid_init_worker(ngx_cycle_t *cycle);
  64
  65
  66
  67 static uint32_t  start_value;
  68 static uint32_t  sequencer_v1 = 1;
  69 static uint32_t  sequencer_v2 = 0x03030302;
  70
  71
  72 static u_char expires[] = "; expires=Thu, 31-Dec-37 23:55:55 GMT";
  73
  74
  75 static ngx_http_output_header_filter_pt  ngx_http_next_header_filter;
  76
  77
  78 static ngx_conf_enum_t  ngx_http_userid_state[] = {
  79     { ngx_string("off"), NGX_HTTP_USERID_OFF },
  80     { ngx_string("log"), NGX_HTTP_USERID_LOG },
  81     { ngx_string("v1"), NGX_HTTP_USERID_V1 },
  82     { ngx_string("on"), NGX_HTTP_USERID_ON },
  83     { ngx_null_string, 0 }
  84 };
  85
  86
  87 static ngx_conf_post_handler_pt  ngx_http_userid_domain_p =
  88     ngx_http_userid_domain;
  89 static ngx_conf_post_handler_pt  ngx_http_userid_path_p = ngx_http_userid_path;
  90 static ngx_conf_post_handler_pt  ngx_http_userid_p3p_p = ngx_http_userid_p3p;
  91
  92
  93 static ngx_command_t  ngx_http_userid_commands[] = {
  94
  95     { ngx_string("userid"),
  96       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
  97       ngx_conf_set_enum_slot,
  98       NGX_HTTP_LOC_CONF_OFFSET,
  99       offsetof(ngx_http_userid_conf_t, enable),
 100       ngx_http_userid_state },
 101
 102     { ngx_string("userid_service"),
 103       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
 104       ngx_conf_set_num_slot,
 105       NGX_HTTP_LOC_CONF_OFFSET,
 106       offsetof(ngx_http_userid_conf_t, service),
 107       NULL },
 108
 109     { ngx_string("userid_name"),
 110       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
 111       ngx_conf_set_str_slot,
 112       NGX_HTTP_LOC_CONF_OFFSET,
 113       offsetof(ngx_http_userid_conf_t, name),
 114       NULL },
 115
 116     { ngx_string("userid_domain"),
 117       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
 118       ngx_conf_set_str_slot,
 119       NGX_HTTP_LOC_CONF_OFFSET,
 120       offsetof(ngx_http_userid_conf_t, domain),
 121       &ngx_http_userid_domain_p },
 122
 123     { ngx_string("userid_path"),
 124       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
 125       ngx_conf_set_str_slot,
 126       NGX_HTTP_LOC_CONF_OFFSET,
 127       offsetof(ngx_http_userid_conf_t, path),
 128       &ngx_http_userid_path_p },
 129
 130     { ngx_string("userid_expires"),
 131       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
 132       ngx_http_userid_expires,
 133       NGX_HTTP_LOC_CONF_OFFSET,
 134       0,
 135       NULL },
 136
 137     { ngx_string("userid_p3p"),
 138       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
 139       ngx_conf_set_str_slot,
 140       NGX_HTTP_LOC_CONF_OFFSET,
 141       offsetof(ngx_http_userid_conf_t, p3p),
 142       &ngx_http_userid_p3p_p },
 143
 144     { ngx_string("userid_mark"),
 145       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
 146       ngx_http_userid_mark,
 147       NGX_HTTP_LOC_CONF_OFFSET,
 148       0,
 149       NULL },
 150
 151       ngx_null_command
 152 };
 153
 154
 155 static ngx_http_module_t  ngx_http_userid_filter_module_ctx = {
 156     ngx_http_userid_add_variables,         /* preconfiguration */
 157     ngx_http_userid_init,                  /* postconfiguration */
 158
 159     NULL,                                  /* create main configuration */
 160     NULL,                                  /* init main configuration */
 161
 162     NULL,                                  /* create server configuration */
 163     NULL,                                  /* merge server configuration */
 164
 165     ngx_http_userid_create_conf,           /* create location configration */
 166     ngx_http_userid_merge_conf             /* merge location configration */
 167 };
 168
 169
 170 ngx_module_t  ngx_http_userid_filter_module = {
 171     NGX_MODULE_V1,
 172     &ngx_http_userid_filter_module_ctx,    /* module context */
 173     ngx_http_userid_commands,              /* module directives */
 174     NGX_HTTP_MODULE,                       /* module type */
 175     NULL,                                  /* init master */
 176     NULL,                                  /* init module */
 177     ngx_http_userid_init_worker,           /* init process */
 178     NULL,                                  /* init thread */
 179     NULL,                                  /* exit thread */
 180     NULL,                                  /* exit process */
 181     NULL,                                  /* exit master */
 182     NGX_MODULE_V1_PADDING
 183 };
 184
 185
 186 static ngx_str_t  ngx_http_userid_got = ngx_string("uid_got");
 187 static ngx_str_t  ngx_http_userid_set = ngx_string("uid_set");
 188
 189
 190 static ngx_int_t
 191 ngx_http_userid_filter(ngx_http_request_t *r)
 192 {
 193     ngx_http_userid_ctx_t   *ctx;
 194     ngx_http_userid_conf_t  *conf;
 195
 196     if (r != r->main) {
 197         return ngx_http_next_header_filter(r);
 198     }
 199
 200     conf = ngx_http_get_module_loc_conf(r, ngx_http_userid_filter_module);
 201
 202     if (conf->enable <= NGX_HTTP_USERID_LOG) {
 203         return ngx_http_next_header_filter(r);
 204     }
 205
 206     ctx = ngx_http_userid_get_uid(r, conf);
 207
 208     if (ctx == NULL) {
 209         return NGX_ERROR;
 210     }
 211
 212     if (ctx->uid_got[3] != 0) {
 213
 214         if (conf->mark == '\0') {
 215             return ngx_http_next_header_filter(r);
 216
 217         } else {
 218             if (ctx->cookie.len > 23
 219                 && ctx->cookie.data[22] == conf->mark
 220                 && ctx->cookie.data[23] == '=')
 221             {
 222                 return ngx_http_next_header_filter(r);
 223             }
 224         }
 225     }
 226
 227     /* ctx->status == NGX_DECLINED */
 228
 229     if (ngx_http_userid_set_uid(r, ctx, conf) == NGX_OK) {
 230         return ngx_http_next_header_filter(r);
 231     }
 232
 233     return NGX_ERROR;
 234 }
 235
 236
 237 static ngx_int_t
 238 ngx_http_userid_got_variable(ngx_http_request_t *r,
 239     ngx_http_variable_value_t *v, uintptr_t data)
 240 {
 241     ngx_http_userid_ctx_t   *ctx;
 242     ngx_http_userid_conf_t  *conf;
 243
 244     conf = ngx_http_get_module_loc_conf(r->main, ngx_http_userid_filter_module);
 245
 246     if (conf->enable == NGX_HTTP_USERID_OFF) {
 247         v->not_found = 1;
 248         return NGX_OK;
 249     }
 250
 251     ctx = ngx_http_userid_get_uid(r, conf);
 252
 253     if (ctx == NULL) {
 254         return NGX_ERROR;
 255     }
 256
 257     if (ctx->uid_got[3] != 0) {
 258         return ngx_http_userid_variable(r, v, &conf->name, ctx->uid_got);
 259     }
 260
 261     /* ctx->status == NGX_DECLINED */
 262
 263     v->not_found = 1;
 264
 265     return NGX_OK;
 266 }
 267
 268
 269 static ngx_int_t
 270 ngx_http_userid_set_variable(ngx_http_request_t *r,
 271     ngx_http_variable_value_t *v, uintptr_t data)
 272 {
 273     ngx_http_userid_ctx_t   *ctx;
 274     ngx_http_userid_conf_t  *conf;
 275
 276     ctx = ngx_http_get_module_ctx(r, ngx_http_userid_filter_module);
 277
 278     if (ctx == NULL || ctx->uid_set[3] == 0) {
 279         v->not_found = 1;
 280         return NGX_OK;
 281     }
 282
 283     conf = ngx_http_get_module_loc_conf(r, ngx_http_userid_filter_module);
 284
 285     return ngx_http_userid_variable(r, 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      * TODO: in the threaded mode the sequencers should be in TLS and their
 369      * ranges should be divided between threads
 370      */
 371
 372     if (ctx->uid_got[3] == 0) {
 373
 374         if (conf->enable == NGX_HTTP_USERID_V1) {
 375             if (conf->service == NGX_CONF_UNSET) {
 376                 ctx->uid_set[0] = 0;
 377             } else {
 378                 ctx->uid_set[0] = conf->service;
 379             }
 380             ctx->uid_set[1] = (uint32_t) ngx_time();
 381             ctx->uid_set[2] = start_value;
 382             ctx->uid_set[3] = sequencer_v1;
 383             sequencer_v1 += 0x100;
 384
 385         } else {
 386             if (conf->service == NGX_CONF_UNSET) {
 387                 if (ngx_http_server_addr(r, NULL) != NGX_OK) {
 388                     return NGX_ERROR;
 389                 }
 390
 391                 ctx->uid_set[0] = htonl(r->in_addr);
 392
 393             } else {
 394                 ctx->uid_set[0] = htonl(conf->service);
 395             }
 396
 397             ctx->uid_set[1] = htonl((uint32_t) ngx_time());
 398             ctx->uid_set[2] = htonl(start_value);
 399             ctx->uid_set[3] = htonl(sequencer_v2);
 400             sequencer_v2 += 0x100;
 401             if (sequencer_v2 < 0x03030302) {
 402                 sequencer_v2 = 0x03030302;
 403             }
 404         }
 405
 406     } else {
 407         ctx->uid_set[0] = ctx->uid_got[0];
 408         ctx->uid_set[1] = ctx->uid_got[1];
 409         ctx->uid_set[2] = ctx->uid_got[2];
 410         ctx->uid_set[3] = ctx->uid_got[3];
 411     }
 412
 413     len = conf->name.len + 1 + ngx_base64_encoded_length(16) + conf->path.len;
 414
 415     if (conf->expires) {
 416         len += sizeof(expires) - 1 + 2;
 417     }
 418
 419     if (conf->domain.len) {
 420         len += conf->domain.len;
 421     }
 422
 423     cookie = ngx_pnalloc(r->pool, len);
 424     if (cookie == NULL) {
 425         return NGX_ERROR;
 426     }
 427
 428     p = ngx_copy(cookie, conf->name.data, conf->name.len);
 429     *p++ = '=';
 430
 431     if (ctx->uid_got[3] == 0) {
 432         src.len = 16;
 433         src.data = (u_char *) ctx->uid_set;
 434         dst.data = p;
 435
 436         ngx_encode_base64(&dst, &src);
 437
 438         p += dst.len;
 439
 440         if (conf->mark) {
 441             *(p - 2) = conf->mark;
 442         }
 443
 444     } else {
 445         p = ngx_cpymem(p, ctx->cookie.data, 22);
 446         *p++ = conf->mark;
 447         *p++ = '=';
 448     }
 449
 450     if (conf->expires == NGX_HTTP_USERID_MAX_EXPIRES) {
 451         p = ngx_cpymem(p, expires, sizeof(expires) - 1);
 452
 453     } else if (conf->expires) {
 454         p = ngx_cpymem(p, expires, sizeof("; expires=") - 1);
 455         p = ngx_http_cookie_time(p, ngx_time() + conf->expires);
 456     }
 457
 458     p = ngx_copy(p, conf->domain.data, conf->domain.len);
 459
 460     p = ngx_copy(p, conf->path.data, conf->path.len);
 461
 462     set_cookie = ngx_list_push(&r->headers_out.headers);
 463     if (set_cookie == NULL) {
 464         return NGX_ERROR;
 465     }
 466
 467     set_cookie->hash = 1;
 468     set_cookie->key.len = sizeof("Set-Cookie") - 1;
 469     set_cookie->key.data = (u_char *) "Set-Cookie";
 470     set_cookie->value.len = p - cookie;
 471     set_cookie->value.data = cookie;
 472
 473     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
 474                    "uid cookie: \"%V\"", &set_cookie->value);
 475
 476     if (conf->p3p.len == 0) {
 477         return NGX_OK;
 478     }
 479
 480     p3p = ngx_list_push(&r->headers_out.headers);
 481     if (p3p == NULL) {
 482         return NGX_ERROR;
 483     }
 484
 485     p3p->hash = 1;
 486     p3p->key.len = sizeof("P3P") - 1;
 487     p3p->key.data = (u_char *) "P3P";
 488     p3p->value = conf->p3p;
 489
 490     return NGX_OK;
 491 }
 492
 493
 494 static ngx_int_t
 495 ngx_http_userid_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
 496     ngx_str_t *name, uint32_t *uid)
 497 {
 498     v->len = name->len + sizeof("=00001111222233334444555566667777") - 1;
 499     v->data = ngx_pnalloc(r->pool, v->len);
 500     if (v->data == NULL) {
 501         return NGX_ERROR;
 502     }
 503
 504     v->valid = 1;
 505     v->no_cacheable = 0;
 506     v->not_found = 0;
 507
 508     ngx_sprintf(v->data, "%V=%08XD%08XD%08XD%08XD",
 509                 name, uid[0], uid[1], uid[2], uid[3]);
 510
 511     return NGX_OK;
 512 }
 513
 514
 515 static ngx_int_t
 516 ngx_http_userid_add_variables(ngx_conf_t *cf)
 517 {
 518     ngx_http_variable_t  *var;
 519
 520     var = ngx_http_add_variable(cf, &ngx_http_userid_got, NGX_HTTP_VAR_NOHASH);
 521     if (var == NULL) {
 522         return NGX_ERROR;
 523     }
 524
 525     var->get_handler = ngx_http_userid_got_variable;
 526
 527     var = ngx_http_add_variable(cf, &ngx_http_userid_set, NGX_HTTP_VAR_NOHASH);
 528     if (var == NULL) {
 529         return NGX_ERROR;
 530     }
 531
 532     var->get_handler = ngx_http_userid_set_variable;
 533
 534     return NGX_OK;
 535 }
 536
 537
 538 static void *
 539 ngx_http_userid_create_conf(ngx_conf_t *cf)
 540 {
 541     ngx_http_userid_conf_t  *conf;
 542
 543     conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_userid_conf_t));
 544     if (conf == NULL) {
 545         return NGX_CONF_ERROR;
 546     }
 547
 548     /*
 549      * set by ngx_pcalloc():
 550      *
 551      *     conf->name.len = 0;
 552      *     conf->name.date = NULL;
 553      *     conf->domain.len = 0;
 554      *     conf->domain.date = NULL;
 555      *     conf->path.len = 0;
 556      *     conf->path.date = NULL;
 557      *     conf->p3p.len = 0;
 558      *     conf->p3p.date = NULL;
 559      */
 560
 561     conf->enable = NGX_CONF_UNSET_UINT;
 562     conf->service = NGX_CONF_UNSET;
 563     conf->expires = NGX_CONF_UNSET;
 564     conf->mark = (u_char) '\xFF';
 565
 566     return conf;
 567 }
 568
 569
 570 static char *
 571 ngx_http_userid_merge_conf(ngx_conf_t *cf, void *parent, void *child)
 572 {
 573     ngx_http_userid_conf_t *prev = parent;
 574     ngx_http_userid_conf_t *conf = child;
 575
 576     ngx_conf_merge_uint_value(conf->enable, prev->enable,
 577                               NGX_HTTP_USERID_OFF);
 578
 579     ngx_conf_merge_str_value(conf->name, prev->name, "uid");
 580     ngx_conf_merge_str_value(conf->domain, prev->domain, "");
 581     ngx_conf_merge_str_value(conf->path, prev->path, "; path=/");
 582     ngx_conf_merge_str_value(conf->p3p, prev->p3p, "");
 583
 584     ngx_conf_merge_value(conf->service, prev->service, NGX_CONF_UNSET);
 585     ngx_conf_merge_sec_value(conf->expires, prev->expires, 0);
 586
 587     if (conf->mark == (u_char) '\xFF') {
 588         if (prev->mark == (u_char) '\xFF') {
 589             conf->mark = '\0';
 590         } else {
 591             conf->mark = prev->mark;
 592         }
 593     }
 594
 595     return NGX_CONF_OK;
 596 }
 597
 598
 599 static ngx_int_t
 600 ngx_http_userid_init(ngx_conf_t *cf)
 601 {
 602     ngx_http_next_header_filter = ngx_http_top_header_filter;
 603     ngx_http_top_header_filter = ngx_http_userid_filter;
 604
 605     return NGX_OK;
 606 }
 607
 608
 609 static char *
 610 ngx_http_userid_domain(ngx_conf_t *cf, void *post, void *data)
 611 {
 612     ngx_str_t  *domain = data;
 613
 614     u_char  *p, *new;
 615
 616     if (ngx_strcmp(domain->data, "none") == 0) {
 617         domain->len = 0;
 618         domain->data = (u_char *) "";
 619
 620         return NGX_CONF_OK;
 621     }
 622
 623     new = ngx_pnalloc(cf->pool, sizeof("; domain=") - 1 + domain->len);
 624     if (new == NULL) {
 625         return NGX_CONF_ERROR;
 626     }
 627
 628     p = ngx_cpymem(new, "; domain=", sizeof("; domain=") - 1);
 629     ngx_memcpy(p, domain->data, domain->len);
 630
 631     domain->len += sizeof("; domain=") - 1;
 632     domain->data = new;
 633
 634     return NGX_CONF_OK;
 635 }
 636
 637
 638 static char *
 639 ngx_http_userid_path(ngx_conf_t *cf, void *post, void *data)
 640 {
 641     ngx_str_t  *path = data;
 642
 643     u_char  *p, *new;
 644
 645     new = ngx_pnalloc(cf->pool, sizeof("; path=") - 1 + path->len);
 646     if (new == NULL) {
 647         return NGX_CONF_ERROR;
 648     }
 649
 650     p = ngx_cpymem(new, "; path=", sizeof("; path=") - 1);
 651     ngx_memcpy(p, path->data, path->len);
 652
 653     path->len += sizeof("; path=") - 1;
 654     path->data = new;
 655
 656     return NGX_CONF_OK;
 657 }
 658
 659
 660 static char *
 661 ngx_http_userid_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 662 {
 663     ngx_http_userid_conf_t *ucf = conf;
 664
 665     ngx_str_t  *value;
 666
 667     if (ucf->expires != NGX_CONF_UNSET) {
 668         return "is duplicate";
 669     }
 670
 671     value = cf->args->elts;
 672
 673     if (ngx_strcmp(value[1].data, "max") == 0) {
 674         ucf->expires = NGX_HTTP_USERID_MAX_EXPIRES;
 675         return NGX_CONF_OK;
 676     }
 677
 678     if (ngx_strcmp(value[1].data, "off") == 0) {
 679         ucf->expires = 0;
 680         return NGX_CONF_OK;
 681     }
 682
 683     ucf->expires = ngx_parse_time(&value[1], 1);
 684     if (ucf->expires == NGX_ERROR) {
 685         return "invalid value";
 686     }
 687
 688     if (ucf->expires == NGX_PARSE_LARGE_TIME) {
 689         return "value must be less than 68 years";
 690     }
 691
 692     return NGX_CONF_OK;
 693 }
 694
 695
 696 static char *
 697 ngx_http_userid_p3p(ngx_conf_t *cf, void *post, void *data)
 698 {
 699     ngx_str_t  *p3p = data;
 700
 701     if (ngx_strcmp(p3p->data, "none") == 0) {
 702         p3p->len = 0;
 703         p3p->data = (u_char *) "";
 704     }
 705
 706     return NGX_CONF_OK;
 707 }
 708
 709
 710 static char *
 711 ngx_http_userid_mark(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 712 {
 713     ngx_http_userid_conf_t *ucf = conf;
 714
 715     ngx_str_t  *value;
 716
 717     if (ucf->mark != (u_char) '\xFF') {
 718         return "is duplicate";
 719     }
 720
 721     value = cf->args->elts;
 722
 723     if (ngx_strcmp(value[1].data, "off") == 0) {
 724         ucf->mark = '\0';
 725         return NGX_CONF_OK;
 726     }
 727
 728     if (value[1].len != 1
 729         || !((value[1].data[0] >= '0' && value[1].data[0] <= '9')
 730               || (value[1].data[0] >= 'A' && value[1].data[0] <= 'Z')
 731               || (value[1].data[0] >= 'a' && value[1].data[0] <= 'z')
 732               || value[1].data[0] == '='))
 733     {
 734         return "value must be \"off\" or a single letter, digit or \"=\"";
 735     }
 736
 737     ucf->mark = value[1].data[0];
 738
 739     return NGX_CONF_OK;
 740 }
 741
 742
 743 static ngx_int_t
 744 ngx_http_userid_init_worker(ngx_cycle_t *cycle)
 745 {
 746     struct timeval  tp;
 747
 748     ngx_gettimeofday(&tp);
 749
 750     /* use the most significant usec part that fits to 16 bits */
 751     start_value = ((tp.tv_usec / 20) << 16) | ngx_pid;
 752
 753     return NGX_OK;
 754 }
 755