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	Version: [ nginx-1.13.12 ]​[ nginx-1.12.2 ]​

 
 /*
  * Copyright (C) Igor Sysoev
  * Copyright (C) Nginx, Inc.
  */
 
 
 #include <ngx_config.h>
 #include <ngx_core.h>
 #include <ngx_http.h>
 
 
 static ngx_int_t ngx_http_script_init_arrays(ngx_http_script_compile_t *sc);
 static ngx_int_t ngx_http_script_done(ngx_http_script_compile_t *sc);
 static ngx_int_t ngx_http_script_add_copy_code(ngx_http_script_compile_t *sc,
     ngx_str_t *value, ngx_uint_t last);
 static ngx_int_t ngx_http_script_add_var_code(ngx_http_script_compile_t *sc,
     ngx_str_t *name);
 static ngx_int_t ngx_http_script_add_args_code(ngx_http_script_compile_t *sc);
 #if (NGX_PCRE)
 static ngx_int_t ngx_http_script_add_capture_code(ngx_http_script_compile_t *sc,
     ngx_uint_t n);
 #endif
 static ngx_int_t
     ngx_http_script_add_full_name_code(ngx_http_script_compile_t *sc);
 static size_t ngx_http_script_full_name_len_code(ngx_http_script_engine_t *e);
 static void ngx_http_script_full_name_code(ngx_http_script_engine_t *e);
 
 
 #define ngx_http_script_exit  (u_char *) &ngx_http_script_exit_code
 
 static uintptr_t ngx_http_script_exit_code = (uintptr_t) NULL;
 
 
 void
 ngx_http_script_flush_complex_value(ngx_http_request_t *r,
     ngx_http_complex_value_t *val)
 {
     ngx_uint_t *index;
 
     index = val->flushes;
 
     if (index) {
         while (*index != (ngx_uint_t) -1) {
 
             if (r->variables[*index].no_cacheable) {
                 r->variables[*index].valid = 0;
                 r->variables[*index].not_found = 0;
             }
 
             index++;
         }
     }
 }
 
 
 ngx_int_t
 ngx_http_complex_value(ngx_http_request_t *r, ngx_http_complex_value_t *val,
     ngx_str_t *value)
 {
     size_t                        len;
     ngx_http_script_code_pt       code;
     ngx_http_script_len_code_pt   lcode;
     ngx_http_script_engine_t      e;
 
     if (val->lengths == NULL) {
         *value = val->value;
         return NGX_OK;
     }
 
     ngx_http_script_flush_complex_value(r, val);
 
     ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
 
     e.ip = val->lengths;
     e.request = r;
     e.flushed = 1;
 
     len = 0;
 
     while (*(uintptr_t *) e.ip) {
         lcode = *(ngx_http_script_len_code_pt *) e.ip;
         len += lcode(&e);
     }
 
     value->len = len;
     value->data = ngx_pnalloc(r->pool, len);
     if (value->data == NULL) {
         return NGX_ERROR;
     }
 
     e.ip = val->values;
     e.pos = value->data;
     e.buf = *value;
 
     while (*(uintptr_t *) e.ip) {
         code = *(ngx_http_script_code_pt *) e.ip;
         code((ngx_http_script_engine_t *) &e);
     }
 
     *value = e.buf;
 
     return NGX_OK;
 }
 
 
 ngx_int_t
 ngx_http_compile_complex_value(ngx_http_compile_complex_value_t *ccv)
 {
     ngx_str_t                  *v;
     ngx_uint_t                  i, n, nv, nc;
     ngx_array_t                 flushes, lengths, values, *pf, *pl, *pv;
     ngx_http_script_compile_t   sc;
 
     v = ccv->value;
 
     nv = 0;
     nc = 0;
 
     for (i = 0; i < v->len; i++) {
         if (v->data[i] == '$') {
             if (v->data[i + 1] >= '1' && v->data[i + 1] <= '9') {
                 nc++;
 
             } else {
                 nv++;
             }
         }
     }
 
     if ((v->len == 0 || v->data[0] != '$')
         && (ccv->conf_prefix || ccv->root_prefix))
     {
         if (ngx_conf_full_name(ccv->cf->cycle, v, ccv->conf_prefix) != NGX_OK) {
             return NGX_ERROR;
         }
 
         ccv->conf_prefix = 0;
         ccv->root_prefix = 0;
     }
 
     ccv->complex_value->value = *v;
     ccv->complex_value->flushes = NULL;
     ccv->complex_value->lengths = NULL;
     ccv->complex_value->values = NULL;
 
     if (nv == 0 && nc == 0) {
         return NGX_OK;
     }
 
     n = nv + 1;
 
     if (ngx_array_init(&flushes, ccv->cf->pool, n, sizeof(ngx_uint_t))
         != NGX_OK)
     {
         return NGX_ERROR;
     }
 
     n = nv * (2 * sizeof(ngx_http_script_copy_code_t)
                   + sizeof(ngx_http_script_var_code_t))
         + sizeof(uintptr_t);
 
     if (ngx_array_init(&lengths, ccv->cf->pool, n, 1) != NGX_OK) {
         return NGX_ERROR;
     }
 
     n = (nv * (2 * sizeof(ngx_http_script_copy_code_t)
                    + sizeof(ngx_http_script_var_code_t))
                 + sizeof(uintptr_t)
                 + v->len
                 + sizeof(uintptr_t) - 1)
             & ~(sizeof(uintptr_t) - 1);
 
     if (ngx_array_init(&values, ccv->cf->pool, n, 1) != NGX_OK) {
         return NGX_ERROR;
     }
 
     pf = &flushes;
     pl = &lengths;
     pv = &values;
 
     ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
 
     sc.cf = ccv->cf;
     sc.source = v;
     sc.flushes = &pf;
     sc.lengths = &pl;
     sc.values = &pv;
     sc.complete_lengths = 1;
     sc.complete_values = 1;
     sc.zero = ccv->zero;
     sc.conf_prefix = ccv->conf_prefix;
     sc.root_prefix = ccv->root_prefix;
 
     if (ngx_http_script_compile(&sc) != NGX_OK) {
         return NGX_ERROR;
     }
 
     if (flushes.nelts) {
         ccv->complex_value->flushes = flushes.elts;
         ccv->complex_value->flushes[flushes.nelts] = (ngx_uint_t) -1;
     }
 
     ccv->complex_value->lengths = lengths.elts;
     ccv->complex_value->values = values.elts;
 
     return NGX_OK;
 }
 
 
 char *
 ngx_http_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 {
     char  *p = conf;
 
     ngx_str_t                          *value;
     ngx_http_complex_value_t          **cv;
     ngx_http_compile_complex_value_t    ccv;
 
     cv = (ngx_http_complex_value_t **) (p + cmd->offset);
 
     if (*cv != NULL) {
         return "is duplicate";
     }
 
     *cv = ngx_palloc(cf->pool, sizeof(ngx_http_complex_value_t));
     if (*cv == NULL) {
         return NGX_CONF_ERROR;
     }
 
     value = cf->args->elts;
 
     ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
 
     ccv.cf = cf;
     ccv.value = &value[1];
     ccv.complex_value = *cv;
 
     if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
         return NGX_CONF_ERROR;
     }
 
     return NGX_CONF_OK;
 }
 
 
 ngx_int_t
 ngx_http_test_predicates(ngx_http_request_t *r, ngx_array_t *predicates)
 {
     ngx_str_t                  val;
     ngx_uint_t                 i;
     ngx_http_complex_value_t  *cv;
 
     if (predicates == NULL) {
         return NGX_OK;
     }
 
     cv = predicates->elts;
 
     for (i = 0; i < predicates->nelts; i++) {
         if (ngx_http_complex_value(r, &cv[i], &val) != NGX_OK) {
             return NGX_ERROR;
         }
 
         if (val.len && (val.len != 1 || val.data[0] != '0')) {
             return NGX_DECLINED;
         }
     }
 
     return NGX_OK;
 }
 
 
 char *
 ngx_http_set_predicate_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 {
     char  *p = conf;
 
     ngx_str_t                          *value;
     ngx_uint_t                          i;
     ngx_array_t                       **a;
     ngx_http_complex_value_t           *cv;
     ngx_http_compile_complex_value_t    ccv;
 
     a = (ngx_array_t **) (p + cmd->offset);
 
     if (*a == NGX_CONF_UNSET_PTR) {
         *a = ngx_array_create(cf->pool, 1, sizeof(ngx_http_complex_value_t));
         if (*a == NULL) {
             return NGX_CONF_ERROR;
         }
     }
 
     value = cf->args->elts;
 
     for (i = 1; i < cf->args->nelts; i++) {
         cv = ngx_array_push(*a);
         if (cv == NULL) {
             return NGX_CONF_ERROR;
         }
 
         ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
 
         ccv.cf = cf;
         ccv.value = &value[i];
         ccv.complex_value = cv;
 
         if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
             return NGX_CONF_ERROR;
         }
     }
 
     return NGX_CONF_OK;
 }
 
 
 ngx_uint_t
 ngx_http_script_variables_count(ngx_str_t *value)
 {
     ngx_uint_t  i, n;
 
     for (n = 0, i = 0; i < value->len; i++) {
         if (value->data[i] == '$') {
             n++;
         }
     }
 
     return n;
 }
 
 
 ngx_int_t
 ngx_http_script_compile(ngx_http_script_compile_t *sc)
 {
     u_char       ch;
     ngx_str_t    name;
     ngx_uint_t   i, bracket;
 
     if (ngx_http_script_init_arrays(sc) != NGX_OK) {
         return NGX_ERROR;
     }
 
     for (i = 0; i < sc->source->len; /* void */ ) {
 
         name.len = 0;
 
         if (sc->source->data[i] == '$') {
 
             if (++i == sc->source->len) {
                 goto invalid_variable;
             }
 
             if (sc->source->data[i] >= '1' && sc->source->data[i] <= '9') {
 #if (NGX_PCRE)
                 ngx_uint_t  n;
 
                 n = sc->source->data[i] - '0';
 
                 if (sc->captures_mask & ((ngx_uint_t) 1 << n)) {
                     sc->dup_capture = 1;
                 }
 
                 sc->captures_mask |= (ngx_uint_t) 1 << n;
 
                 if (ngx_http_script_add_capture_code(sc, n) != NGX_OK) {
                     return NGX_ERROR;
                 }
 
                 i++;
 
                 continue;
 #else
                 ngx_conf_log_error(NGX_LOG_EMERG, sc->cf, 0,
                                    "using variable \"$%c\" requires "
                                    "PCRE library", sc->source->data[i]);
                 return NGX_ERROR;
 #endif
             }
 
             if (sc->source->data[i] == '{') {
                 bracket = 1;
 
                 if (++i == sc->source->len) {
                     goto invalid_variable;
                 }
 
                 name.data = &sc->source->data[i];
 
             } else {
                 bracket = 0;
                 name.data = &sc->source->data[i];
             }
 
             for ( /* void */ ; i < sc->source->len; i++, name.len++) {
                 ch = sc->source->data[i];
 
                 if (ch == '}' && bracket) {
                     i++;
                     bracket = 0;
                     break;
                 }
 
                 if ((ch >= 'A' && ch <= 'Z')
                     || (ch >= 'a' && ch <= 'z')
                     || (ch >= '0' && ch <= '9')
                     || ch == '_')
                 {
                     continue;
                 }
 
                 break;
             }
 
             if (bracket) {
                 ngx_conf_log_error(NGX_LOG_EMERG, sc->cf, 0,
                                    "the closing bracket in \"%V\" "
                                    "variable is missing", &name);
                 return NGX_ERROR;
             }
 
             if (name.len == 0) {
                 goto invalid_variable;
             }
 
             sc->variables++;
 
             if (ngx_http_script_add_var_code(sc, &name) != NGX_OK) {
                 return NGX_ERROR;
             }
 
             continue;
         }
 
         if (sc->source->data[i] == '?' && sc->compile_args) {
             sc->args = 1;
             sc->compile_args = 0;
 
             if (ngx_http_script_add_args_code(sc) != NGX_OK) {
                 return NGX_ERROR;
             }
 
             i++;
 
             continue;
         }
 
         name.data = &sc->source->data[i];
 
         while (i < sc->source->len) {
 
             if (sc->source->data[i] == '$') {
                 break;
             }
 
             if (sc->source->data[i] == '?') {
 
                 sc->args = 1;
 
                 if (sc->compile_args) {
                     break;
                 }
             }
 
             i++;
             name.len++;
         }
 
         sc->size += name.len;
 
         if (ngx_http_script_add_copy_code(sc, &name, (i == sc->source->len))
             != NGX_OK)
         {
             return NGX_ERROR;
         }
     }
 
     return ngx_http_script_done(sc);
 
 invalid_variable:
 
     ngx_conf_log_error(NGX_LOG_EMERG, sc->cf, 0, "invalid variable name");
 
     return NGX_ERROR;
 }
 
 
 u_char *
 ngx_http_script_run(ngx_http_request_t *r, ngx_str_t *value,
     void *code_lengths, size_t len, void *code_values)
 {
     ngx_uint_t                    i;
     ngx_http_script_code_pt       code;
     ngx_http_script_len_code_pt   lcode;
     ngx_http_script_engine_t      e;
     ngx_http_core_main_conf_t    *cmcf;
 
     cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
 
     for (i = 0; i < cmcf->variables.nelts; i++) {
         if (r->variables[i].no_cacheable) {
             r->variables[i].valid = 0;
             r->variables[i].not_found = 0;
         }
     }
 
     ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
 
     e.ip = code_lengths;
     e.request = r;
     e.flushed = 1;
 
     while (*(uintptr_t *) e.ip) {
         lcode = *(ngx_http_script_len_code_pt *) e.ip;
         len += lcode(&e);
     }
 
 
     value->len = len;
     value->data = ngx_pnalloc(r->pool, len);
     if (value->data == NULL) {
         return NULL;
     }
 
     e.ip = code_values;
     e.pos = value->data;
 
     while (*(uintptr_t *) e.ip) {
         code = *(ngx_http_script_code_pt *) e.ip;
         code((ngx_http_script_engine_t *) &e);
     }
 
     return e.pos;
 }
 
 
 void
 ngx_http_script_flush_no_cacheable_variables(ngx_http_request_t *r,
     ngx_array_t *indices)
 {
     ngx_uint_t  n, *index;
 
     if (indices) {
         index = indices->elts;
         for (n = 0; n < indices->nelts; n++) {
             if (r->variables[index[n]].no_cacheable) {
                 r->variables[index[n]].valid = 0;
                 r->variables[index[n]].not_found = 0;
             }
         }
     }
 }
 
 
 static ngx_int_t
 ngx_http_script_init_arrays(ngx_http_script_compile_t *sc)
 {
     ngx_uint_t   n;
 
     if (sc->flushes && *sc->flushes == NULL) {
         n = sc->variables ? sc->variables : 1;
         *sc->flushes = ngx_array_create(sc->cf->pool, n, sizeof(ngx_uint_t));
         if (*sc->flushes == NULL) {
             return NGX_ERROR;
         }
     }
 
     if (*sc->lengths == NULL) {
         n = sc->variables * (2 * sizeof(ngx_http_script_copy_code_t)
                              + sizeof(ngx_http_script_var_code_t))
             + sizeof(uintptr_t);
 
         *sc->lengths = ngx_array_create(sc->cf->pool, n, 1);
         if (*sc->lengths == NULL) {
             return NGX_ERROR;
         }
     }
 
     if (*sc->values == NULL) {
         n = (sc->variables * (2 * sizeof(ngx_http_script_copy_code_t)
                               + sizeof(ngx_http_script_var_code_t))
                 + sizeof(uintptr_t)
                 + sc->source->len
                 + sizeof(uintptr_t) - 1)
             & ~(sizeof(uintptr_t) - 1);
 
         *sc->values = ngx_array_create(sc->cf->pool, n, 1);
         if (*sc->values == NULL) {
             return NGX_ERROR;
         }
     }
 
     sc->variables = 0;
 
     return NGX_OK;
 }
 
 
 static ngx_int_t
 ngx_http_script_done(ngx_http_script_compile_t *sc)
 {
     ngx_str_t    zero;
     uintptr_t   *code;
 
     if (sc->zero) {
 
         zero.len = 1;
         zero.data = (u_char *) "\0";
 
         if (ngx_http_script_add_copy_code(sc, &zero, 0) != NGX_OK) {
             return NGX_ERROR;
         }
     }
 
     if (sc->conf_prefix || sc->root_prefix) {
         if (ngx_http_script_add_full_name_code(sc) != NGX_OK) {
             return NGX_ERROR;
         }
     }
 
     if (sc->complete_lengths) {
         code = ngx_http_script_add_code(*sc->lengths, sizeof(uintptr_t), NULL);
         if (code == NULL) {
             return NGX_ERROR;
         }
 
         *code = (uintptr_t) NULL;
     }
 
     if (sc->complete_values) {
         code = ngx_http_script_add_code(*sc->values, sizeof(uintptr_t),
                                         &sc->main);
         if (code == NULL) {
             return NGX_ERROR;
         }
 
         *code = (uintptr_t) NULL;
     }
 
     return NGX_OK;
 }
 
 
 void *
 ngx_http_script_start_code(ngx_pool_t *pool, ngx_array_t **codes, size_t size)
 {
     if (*codes == NULL) {
         *codes = ngx_array_create(pool, 256, 1);
         if (*codes == NULL) {
             return NULL;
         }
     }
 
     return ngx_array_push_n(*codes, size);
 }
 
 
 void *
 ngx_http_script_add_code(ngx_array_t *codes, size_t size, void *code)
 {
     u_char  *elts, **p;
     void    *new;
 
     elts = codes->elts;
 
     new = ngx_array_push_n(codes, size);
     if (new == NULL) {
         return NULL;
     }
 
     if (code) {
         if (elts != codes->elts) {
             p = code;
             *p += (u_char *) codes->elts - elts;
         }
     }
 
     return new;
 }
 
 
 static ngx_int_t
 ngx_http_script_add_copy_code(ngx_http_script_compile_t *sc, ngx_str_t *value,
     ngx_uint_t last)
 {
     u_char                       *p;
     size_t                        size, len, zero;
     ngx_http_script_copy_code_t  *code;
 
     zero = (sc->zero && last);
     len = value->len + zero;
 
     code = ngx_http_script_add_code(*sc->lengths,
                                     sizeof(ngx_http_script_copy_code_t), NULL);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = (ngx_http_script_code_pt) ngx_http_script_copy_len_code;
     code->len = len;
 
     size = (sizeof(ngx_http_script_copy_code_t) + len + sizeof(uintptr_t) - 1)
             & ~(sizeof(uintptr_t) - 1);
 
     code = ngx_http_script_add_code(*sc->values, size, &sc->main);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = ngx_http_script_copy_code;
     code->len = len;
 
     p = ngx_cpymem((u_char *) code + sizeof(ngx_http_script_copy_code_t),
                    value->data, value->len);
 
     if (zero) {
         *p = '\0';
         sc->zero = 0;
     }
 
     return NGX_OK;
 }
 
 
 size_t
 ngx_http_script_copy_len_code(ngx_http_script_engine_t *e)
 {
     ngx_http_script_copy_code_t  *code;
 
     code = (ngx_http_script_copy_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_copy_code_t);
 
     return code->len;
 }
 
 
 void
 ngx_http_script_copy_code(ngx_http_script_engine_t *e)
 {
     u_char                       *p;
     ngx_http_script_copy_code_t  *code;
 
     code = (ngx_http_script_copy_code_t *) e->ip;
 
     p = e->pos;
 
     if (!e->skip) {
         e->pos = ngx_copy(p, e->ip + sizeof(ngx_http_script_copy_code_t),
                           code->len);
     }
 
     e->ip += sizeof(ngx_http_script_copy_code_t)
           + ((code->len + sizeof(uintptr_t) - 1) & ~(sizeof(uintptr_t) - 1));
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script copy: \"%*s\"", e->pos - p, p);
 }
 
 
 static ngx_int_t
 ngx_http_script_add_var_code(ngx_http_script_compile_t *sc, ngx_str_t *name)
 {
     ngx_int_t                    index, *p;
     ngx_http_script_var_code_t  *code;
 
     index = ngx_http_get_variable_index(sc->cf, name);
 
     if (index == NGX_ERROR) {
         return NGX_ERROR;
     }
 
     if (sc->flushes) {
         p = ngx_array_push(*sc->flushes);
         if (p == NULL) {
             return NGX_ERROR;
         }
 
         *p = index;
     }
 
     code = ngx_http_script_add_code(*sc->lengths,
                                     sizeof(ngx_http_script_var_code_t), NULL);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = (ngx_http_script_code_pt) ngx_http_script_copy_var_len_code;
     code->index = (uintptr_t) index;
 
     code = ngx_http_script_add_code(*sc->values,
                                     sizeof(ngx_http_script_var_code_t),
                                     &sc->main);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = ngx_http_script_copy_var_code;
     code->index = (uintptr_t) index;
 
     return NGX_OK;
 }
 
 
 size_t
 ngx_http_script_copy_var_len_code(ngx_http_script_engine_t *e)
 {
     ngx_http_variable_value_t   *value;
     ngx_http_script_var_code_t  *code;
 
     code = (ngx_http_script_var_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_var_code_t);
 
     if (e->flushed) {
         value = ngx_http_get_indexed_variable(e->request, code->index);
 
     } else {
         value = ngx_http_get_flushed_variable(e->request, code->index);
     }
 
     if (value && !value->not_found) {
         return value->len;
     }
 
     return 0;
 }
 
 
 void
 ngx_http_script_copy_var_code(ngx_http_script_engine_t *e)
 {
     u_char                      *p;
     ngx_http_variable_value_t   *value;
     ngx_http_script_var_code_t  *code;
 
     code = (ngx_http_script_var_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_var_code_t);
 
     if (!e->skip) {
 
         if (e->flushed) {
             value = ngx_http_get_indexed_variable(e->request, code->index);
 
         } else {
             value = ngx_http_get_flushed_variable(e->request, code->index);
         }
 
         if (value && !value->not_found) {
             p = e->pos;
             e->pos = ngx_copy(p, value->data, value->len);
 
             ngx_log_debug2(NGX_LOG_DEBUG_HTTP,
                            e->request->connection->log, 0,
                            "http script var: \"%*s\"", e->pos - p, p);
         }
     }
 }
 
 
 static ngx_int_t
 ngx_http_script_add_args_code(ngx_http_script_compile_t *sc)
 {
     uintptr_t   *code;
 
     code = ngx_http_script_add_code(*sc->lengths, sizeof(uintptr_t), NULL);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     *code = (uintptr_t) ngx_http_script_mark_args_code;
 
     code = ngx_http_script_add_code(*sc->values, sizeof(uintptr_t), &sc->main);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     *code = (uintptr_t) ngx_http_script_start_args_code;
 
     return NGX_OK;
 }
 
 
 size_t
 ngx_http_script_mark_args_code(ngx_http_script_engine_t *e)
 {
     e->is_args = 1;
     e->ip += sizeof(uintptr_t);
 
     return 1;
 }
 
 
 void
 ngx_http_script_start_args_code(ngx_http_script_engine_t *e)
 {
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script args");
 
     e->is_args = 1;
     e->args = e->pos;
     e->ip += sizeof(uintptr_t);
 }
 
 
 #if (NGX_PCRE)
 
 void
 ngx_http_script_regex_start_code(ngx_http_script_engine_t *e)
 {
     size_t                         len;
     ngx_int_t                      rc;
     ngx_uint_t                     n;
     ngx_http_request_t            *r;
     ngx_http_script_engine_t       le;
     ngx_http_script_len_code_pt    lcode;
     ngx_http_script_regex_code_t  *code;
 
     code = (ngx_http_script_regex_code_t *) e->ip;
 
     r = e->request;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http script regex: \"%V\"", &code->name);
 
     if (code->uri) {
         e->line = r->uri;
     } else {
         e->sp--;
         e->line.len = e->sp->len;
         e->line.data = e->sp->data;
     }
 
     rc = ngx_http_regex_exec(r, code->regex, &e->line);
 
     if (rc == NGX_DECLINED) {
         if (e->log || (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP)) {
             ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
                           "\"%V\" does not match \"%V\"",
                           &code->name, &e->line);
         }
 
         r->ncaptures = 0;
 
         if (code->test) {
             if (code->negative_test) {
                 e->sp->len = 1;
                 e->sp->data = (u_char *) "1";
 
             } else {
                 e->sp->len = 0;
                 e->sp->data = (u_char *) "";
             }
 
             e->sp++;
 
             e->ip += sizeof(ngx_http_script_regex_code_t);
             return;
         }
 
         e->ip += code->next;
         return;
     }
 
     if (rc == NGX_ERROR) {
         e->ip = ngx_http_script_exit;
         e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
         return;
     }
 
     if (e->log || (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP)) {
         ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
                       "\"%V\" matches \"%V\"", &code->name, &e->line);
     }
 
     if (code->test) {
         if (code->negative_test) {
             e->sp->len = 0;
             e->sp->data = (u_char *) "";
 
         } else {
             e->sp->len = 1;
             e->sp->data = (u_char *) "1";
         }
 
         e->sp++;
 
         e->ip += sizeof(ngx_http_script_regex_code_t);
         return;
     }
 
     if (code->status) {
         e->status = code->status;
 
         if (!code->redirect) {
             e->ip = ngx_http_script_exit;
             return;
         }
     }
 
     if (code->uri) {
         r->internal = 1;
         r->valid_unparsed_uri = 0;
 
         if (code->break_cycle) {
             r->valid_location = 0;
             r->uri_changed = 0;
 
         } else {
             r->uri_changed = 1;
         }
     }
 
     if (code->lengths == NULL) {
         e->buf.len = code->size;
 
         if (code->uri) {
             if (r->ncaptures && (r->quoted_uri || r->plus_in_uri)) {
                 e->buf.len += 2 * ngx_escape_uri(NULL, r->uri.data, r->uri.len,
                                                  NGX_ESCAPE_ARGS);
             }
         }
 
         for (n = 2; n < r->ncaptures; n += 2) {
             e->buf.len += r->captures[n + 1] - r->captures[n];
         }
 
     } else {
         ngx_memzero(&le, sizeof(ngx_http_script_engine_t));
 
         le.ip = code->lengths->elts;
         le.line = e->line;
         le.request = r;
         le.quote = code->redirect;
 
         len = 0;
 
         while (*(uintptr_t *) le.ip) {
             lcode = *(ngx_http_script_len_code_pt *) le.ip;
             len += lcode(&le);
         }
 
         e->buf.len = len;
     }
 
     if (code->add_args && r->args.len) {
         e->buf.len += r->args.len + 1;
     }
 
     e->buf.data = ngx_pnalloc(r->pool, e->buf.len);
     if (e->buf.data == NULL) {
         e->ip = ngx_http_script_exit;
         e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
         return;
     }
 
     e->quote = code->redirect;
 
     e->pos = e->buf.data;
 
     e->ip += sizeof(ngx_http_script_regex_code_t);
 }
 
 
 void
 ngx_http_script_regex_end_code(ngx_http_script_engine_t *e)
 {
     u_char                            *dst, *src;
     ngx_http_request_t                *r;
     ngx_http_script_regex_end_code_t  *code;
 
     code = (ngx_http_script_regex_end_code_t *) e->ip;
 
     r = e->request;
 
     e->quote = 0;
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http script regex end");
 
     if (code->redirect) {
 
         dst = e->buf.data;
         src = e->buf.data;
 
         ngx_unescape_uri(&dst, &src, e->pos - e->buf.data,
                          NGX_UNESCAPE_REDIRECT);
 
         if (src < e->pos) {
             dst = ngx_movemem(dst, src, e->pos - src);
         }
 
         e->pos = dst;
 
         if (code->add_args && r->args.len) {
             *e->pos++ = (u_char) (code->args ? '&' : '?');
             e->pos = ngx_copy(e->pos, r->args.data, r->args.len);
         }
 
         e->buf.len = e->pos - e->buf.data;
 
         if (e->log || (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP)) {
             ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
                           "rewritten redirect: \"%V\"", &e->buf);
         }
 
         ngx_http_clear_location(r);
 
         r->headers_out.location = ngx_list_push(&r->headers_out.headers);
         if (r->headers_out.location == NULL) {
             e->ip = ngx_http_script_exit;
             e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
             return;
         }
 
         r->headers_out.location->hash = 1;
         ngx_str_set(&r->headers_out.location->key, "Location");
         r->headers_out.location->value = e->buf;
 
         e->ip += sizeof(ngx_http_script_regex_end_code_t);
         return;
     }
 
     if (e->args) {
         e->buf.len = e->args - e->buf.data;
 
         if (code->add_args && r->args.len) {
             *e->pos++ = '&';
             e->pos = ngx_copy(e->pos, r->args.data, r->args.len);
         }
 
         r->args.len = e->pos - e->args;
         r->args.data = e->args;
 
         e->args = NULL;
 
     } else {
         e->buf.len = e->pos - e->buf.data;
 
         if (!code->add_args) {
             r->args.len = 0;
         }
     }
 
     if (e->log || (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP)) {
         ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
                       "rewritten data: \"%V\", args: \"%V\"",
                       &e->buf, &r->args);
     }
 
     if (code->uri) {
         r->uri = e->buf;
 
         if (r->uri.len == 0) {
             ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                           "the rewritten URI has a zero length");
             e->ip = ngx_http_script_exit;
             e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
             return;
         }
 
         ngx_http_set_exten(r);
     }
 
     e->ip += sizeof(ngx_http_script_regex_end_code_t);
 }
 
 
 static ngx_int_t
 ngx_http_script_add_capture_code(ngx_http_script_compile_t *sc, ngx_uint_t n)
 {
     ngx_http_script_copy_capture_code_t  *code;
 
     code = ngx_http_script_add_code(*sc->lengths,
                                     sizeof(ngx_http_script_copy_capture_code_t),
                                     NULL);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = (ngx_http_script_code_pt)
                       ngx_http_script_copy_capture_len_code;
     code->n = 2 * n;
 
 
     code = ngx_http_script_add_code(*sc->values,
                                     sizeof(ngx_http_script_copy_capture_code_t),
                                     &sc->main);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = ngx_http_script_copy_capture_code;
     code->n = 2 * n;
 
     if (sc->ncaptures < n) {
         sc->ncaptures = n;
     }
 
     return NGX_OK;
 }
 
 
 size_t
 ngx_http_script_copy_capture_len_code(ngx_http_script_engine_t *e)
 {
     int                                  *cap;
     u_char                               *p;
     ngx_uint_t                            n;
     ngx_http_request_t                   *r;
     ngx_http_script_copy_capture_code_t  *code;
 
     r = e->request;
 
     code = (ngx_http_script_copy_capture_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_copy_capture_code_t);
 
     n = code->n;
 
     if (n < r->ncaptures) {
 
         cap = r->captures;
 
         if ((e->is_args || e->quote)
             && (e->request->quoted_uri || e->request->plus_in_uri))
         {
             p = r->captures_data;
 
             return cap[n + 1] - cap[n]
                    + 2 * ngx_escape_uri(NULL, &p[cap[n]], cap[n + 1] - cap[n],
                                         NGX_ESCAPE_ARGS);
         } else {
             return cap[n + 1] - cap[n];
         }
     }
 
     return 0;
 }
 
 
 void
 ngx_http_script_copy_capture_code(ngx_http_script_engine_t *e)
 {
     int                                  *cap;
     u_char                               *p, *pos;
     ngx_uint_t                            n;
     ngx_http_request_t                   *r;
     ngx_http_script_copy_capture_code_t  *code;
 
     r = e->request;
 
     code = (ngx_http_script_copy_capture_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_copy_capture_code_t);
 
     n = code->n;
 
     pos = e->pos;
 
     if (n < r->ncaptures) {
 
         cap = r->captures;
         p = r->captures_data;
 
         if ((e->is_args || e->quote)
             && (e->request->quoted_uri || e->request->plus_in_uri))
         {
             e->pos = (u_char *) ngx_escape_uri(pos, &p[cap[n]],
                                                cap[n + 1] - cap[n],
                                                NGX_ESCAPE_ARGS);
         } else {
             e->pos = ngx_copy(pos, &p[cap[n]], cap[n + 1] - cap[n]);
         }
     }
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script capture: \"%*s\"", e->pos - pos, pos);
 }
 
 #endif
 
 
 static ngx_int_t
 ngx_http_script_add_full_name_code(ngx_http_script_compile_t *sc)
 {
     ngx_http_script_full_name_code_t  *code;
 
     code = ngx_http_script_add_code(*sc->lengths,
                                     sizeof(ngx_http_script_full_name_code_t),
                                     NULL);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = (ngx_http_script_code_pt) ngx_http_script_full_name_len_code;
     code->conf_prefix = sc->conf_prefix;
 
     code = ngx_http_script_add_code(*sc->values,
                                     sizeof(ngx_http_script_full_name_code_t),
                                     &sc->main);
     if (code == NULL) {
         return NGX_ERROR;
     }
 
     code->code = ngx_http_script_full_name_code;
     code->conf_prefix = sc->conf_prefix;
 
     return NGX_OK;
 }
 
 
 static size_t
 ngx_http_script_full_name_len_code(ngx_http_script_engine_t *e)
 {
     ngx_http_script_full_name_code_t  *code;
 
     code = (ngx_http_script_full_name_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_full_name_code_t);
 
     return code->conf_prefix ? ngx_cycle->conf_prefix.len:
                                ngx_cycle->prefix.len;
 }
 
 
 static void
 ngx_http_script_full_name_code(ngx_http_script_engine_t *e)
 {
     ngx_http_script_full_name_code_t  *code;
 
     ngx_str_t  value, *prefix;
 
     code = (ngx_http_script_full_name_code_t *) e->ip;
 
     value.data = e->buf.data;
     value.len = e->pos - e->buf.data;
 
     prefix = code->conf_prefix ? (ngx_str_t *) &ngx_cycle->conf_prefix:
                                  (ngx_str_t *) &ngx_cycle->prefix;
 
     if (ngx_get_full_name(e->request->pool, prefix, &value) != NGX_OK) {
         e->ip = ngx_http_script_exit;
         e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
         return;
     }
 
     e->buf = value;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script fullname: \"%V\"", &value);
 
     e->ip += sizeof(ngx_http_script_full_name_code_t);
 }
 
 
 void
 ngx_http_script_return_code(ngx_http_script_engine_t *e)
 {
     ngx_http_script_return_code_t  *code;
 
     code = (ngx_http_script_return_code_t *) e->ip;
 
     if (code->status < NGX_HTTP_BAD_REQUEST
         || code->text.value.len
         || code->text.lengths)
     {
         e->status = ngx_http_send_response(e->request, code->status, NULL,
                                            &code->text);
     } else {
         e->status = code->status;
     }
 
     e->ip = ngx_http_script_exit;
 }
 
 
 void
 ngx_http_script_break_code(ngx_http_script_engine_t *e)
 {
     e->request->uri_changed = 0;
 
     e->ip = ngx_http_script_exit;
 }
 
 
 void
 ngx_http_script_if_code(ngx_http_script_engine_t *e)
 {
     ngx_http_script_if_code_t  *code;
 
     code = (ngx_http_script_if_code_t *) e->ip;
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script if");
 
     e->sp--;
 
     if (e->sp->len && (e->sp->len != 1 || e->sp->data[0] != '0')) {
         if (code->loc_conf) {
             e->request->loc_conf = code->loc_conf;
             ngx_http_update_location_config(e->request);
         }
 
         e->ip += sizeof(ngx_http_script_if_code_t);
         return;
     }
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script if: false");
 
     e->ip += code->next;
 }
 
 
 void
 ngx_http_script_equal_code(ngx_http_script_engine_t *e)
 {
     ngx_http_variable_value_t  *val, *res;
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script equal");
 
     e->sp--;
     val = e->sp;
     res = e->sp - 1;
 
     e->ip += sizeof(uintptr_t);
 
     if (val->len == res->len
         && ngx_strncmp(val->data, res->data, res->len) == 0)
     {
         *res = ngx_http_variable_true_value;
         return;
     }
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script equal: no");
 
     *res = ngx_http_variable_null_value;
 }
 
 
 void
 ngx_http_script_not_equal_code(ngx_http_script_engine_t *e)
 {
     ngx_http_variable_value_t  *val, *res;
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script not equal");
 
     e->sp--;
     val = e->sp;
     res = e->sp - 1;
 
     e->ip += sizeof(uintptr_t);
 
     if (val->len == res->len
         && ngx_strncmp(val->data, res->data, res->len) == 0)
     {
         ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                        "http script not equal: no");
 
         *res = ngx_http_variable_null_value;
         return;
     }
 
     *res = ngx_http_variable_true_value;
 }
 
 
 void
 ngx_http_script_file_code(ngx_http_script_engine_t *e)
 {
     ngx_str_t                     path;
     ngx_http_request_t           *r;
     ngx_open_file_info_t          of;
     ngx_http_core_loc_conf_t     *clcf;
     ngx_http_variable_value_t    *value;
     ngx_http_script_file_code_t  *code;
 
     value = e->sp - 1;
 
     code = (ngx_http_script_file_code_t *) e->ip;
     e->ip += sizeof(ngx_http_script_file_code_t);
 
     path.len = value->len - 1;
     path.data = value->data;
 
     r = e->request;
 
     ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http script file op %p \"%V\"", (void *) code->op, &path);
 
     clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
 
     ngx_memzero(&of, sizeof(ngx_open_file_info_t));
 
     of.read_ahead = clcf->read_ahead;
     of.directio = clcf->directio;
     of.valid = clcf->open_file_cache_valid;
     of.min_uses = clcf->open_file_cache_min_uses;
     of.test_only = 1;
     of.errors = clcf->open_file_cache_errors;
     of.events = clcf->open_file_cache_events;
 
     if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
         e->ip = ngx_http_script_exit;
         e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
         return;
     }
 
     if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
         != NGX_OK)
     {
         if (of.err == 0) {
             e->ip = ngx_http_script_exit;
             e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
             return;
         }
 
         if (of.err != NGX_ENOENT
             && of.err != NGX_ENOTDIR
             && of.err != NGX_ENAMETOOLONG)
         {
             ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
                           "%s \"%s\" failed", of.failed, value->data);
         }
 
         switch (code->op) {
 
         case ngx_http_script_file_plain:
         case ngx_http_script_file_dir:
         case ngx_http_script_file_exists:
         case ngx_http_script_file_exec:
              goto false_value;
 
         case ngx_http_script_file_not_plain:
         case ngx_http_script_file_not_dir:
         case ngx_http_script_file_not_exists:
         case ngx_http_script_file_not_exec:
              goto true_value;
         }
 
         goto false_value;
     }
 
     switch (code->op) {
     case ngx_http_script_file_plain:
         if (of.is_file) {
              goto true_value;
         }
         goto false_value;
 
     case ngx_http_script_file_not_plain:
         if (of.is_file) {
             goto false_value;
         }
         goto true_value;
 
     case ngx_http_script_file_dir:
         if (of.is_dir) {
              goto true_value;
         }
         goto false_value;
 
     case ngx_http_script_file_not_dir:
         if (of.is_dir) {
             goto false_value;
         }
         goto true_value;
 
     case ngx_http_script_file_exists:
         if (of.is_file || of.is_dir || of.is_link) {
              goto true_value;
         }
         goto false_value;
 
     case ngx_http_script_file_not_exists:
         if (of.is_file || of.is_dir || of.is_link) {
             goto false_value;
         }
         goto true_value;
 
     case ngx_http_script_file_exec:
         if (of.is_exec) {
              goto true_value;
         }
         goto false_value;
 
     case ngx_http_script_file_not_exec:
         if (of.is_exec) {
             goto false_value;
         }
         goto true_value;
     }
 
 false_value:
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http script file op false");
 
     *value = ngx_http_variable_null_value;
     return;
 
 true_value:
 
     *value = ngx_http_variable_true_value;
     return;
 }
 
 
 void
 ngx_http_script_complex_value_code(ngx_http_script_engine_t *e)
 {
     size_t                                 len;
     ngx_http_script_engine_t               le;
     ngx_http_script_len_code_pt            lcode;
     ngx_http_script_complex_value_code_t  *code;
 
     code = (ngx_http_script_complex_value_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_complex_value_code_t);
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script complex value");
 
     ngx_memzero(&le, sizeof(ngx_http_script_engine_t));
 
     le.ip = code->lengths->elts;
     le.line = e->line;
     le.request = e->request;
     le.quote = e->quote;
 
     for (len = 0; *(uintptr_t *) le.ip; len += lcode(&le)) {
         lcode = *(ngx_http_script_len_code_pt *) le.ip;
     }
 
     e->buf.len = len;
     e->buf.data = ngx_pnalloc(e->request->pool, len);
     if (e->buf.data == NULL) {
         e->ip = ngx_http_script_exit;
         e->status = NGX_HTTP_INTERNAL_SERVER_ERROR;
         return;
     }
 
     e->pos = e->buf.data;
 
     e->sp->len = e->buf.len;
     e->sp->data = e->buf.data;
     e->sp++;
 }
 
 
 void
 ngx_http_script_value_code(ngx_http_script_engine_t *e)
 {
     ngx_http_script_value_code_t  *code;
 
     code = (ngx_http_script_value_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_value_code_t);
 
     e->sp->len = code->text_len;
     e->sp->data = (u_char *) code->text_data;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script value: \"%v\"", e->sp);
 
     e->sp++;
 }
 
 
 void
 ngx_http_script_set_var_code(ngx_http_script_engine_t *e)
 {
     ngx_http_request_t          *r;
     ngx_http_script_var_code_t  *code;
 
     code = (ngx_http_script_var_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_var_code_t);
 
     r = e->request;
 
     e->sp--;
 
     r->variables[code->index].len = e->sp->len;
     r->variables[code->index].valid = 1;
     r->variables[code->index].no_cacheable = 0;
     r->variables[code->index].not_found = 0;
     r->variables[code->index].data = e->sp->data;
 
 #if (NGX_DEBUG)
     {
     ngx_http_variable_t        *v;
     ngx_http_core_main_conf_t  *cmcf;
 
     cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
 
     v = cmcf->variables.elts;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script set $%V", &v[code->index].name);
     }
 #endif
 }
 
 
 void
 ngx_http_script_var_set_handler_code(ngx_http_script_engine_t *e)
 {
     ngx_http_script_var_handler_code_t  *code;
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script set var handler");
 
     code = (ngx_http_script_var_handler_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_var_handler_code_t);
 
     e->sp--;
 
     code->handler(e->request, e->sp, code->data);
 }
 
 
 void
 ngx_http_script_var_code(ngx_http_script_engine_t *e)
 {
     ngx_http_variable_value_t   *value;
     ngx_http_script_var_code_t  *code;
 
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                    "http script var");
 
     code = (ngx_http_script_var_code_t *) e->ip;
 
     e->ip += sizeof(ngx_http_script_var_code_t);
 
     value = ngx_http_get_flushed_variable(e->request, code->index);
 
     if (value && !value->not_found) {
         ngx_log_debug1(NGX_LOG_DEBUG_HTTP, e->request->connection->log, 0,
                        "http script var: \"%v\"", value);
 
         *e->sp = *value;
         e->sp++;
 
         return;
     }
 
     *e->sp = ngx_http_variable_null_value;
     e->sp++;
 }
 
 
 void
 ngx_http_script_nop_code(ngx_http_script_engine_t *e)
 {
     e->ip += sizeof(uintptr_t);
 }

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