view src/stream/ngx_stream_variables.c @ 6874:7cc2d3a96ea3

Fixed trailer construction with limit on FreeBSD and macOS. The ngx_chain_coalesce_file() function may produce more bytes to send then requested in the limit passed, as it aligns the last file position to send to memory page boundary. As a result, (limit - send) may become negative. This resulted in big positive number when converted to size_t while calling ngx_output_chain_to_iovec(). Another part of the problem is in ngx_chain_coalesce_file(): it changes cl to the next chain link even if the current buffer is only partially sent due to limit. Therefore, if a file buffer was not expected to be fully sent due to limit, and was followed by a memory buffer, nginx called sendfile() with a part of the file buffer, and the memory buffer in trailer. If there were enough room in the socket buffer, this resulted in a part of the file buffer being skipped, and corresponding part of the memory buffer sent instead. The bug was introduced in 8e903522c17a (1.7.8). Configurations affected are ones using limits, that is, limit_rate and/or sendfile_max_chunk, and memory buffers after file ones (may happen when using subrequests or with proxying with disk buffering). Fix is to explicitly check if (send < limit) before constructing trailer with ngx_output_chain_to_iovec(). Additionally, ngx_chain_coalesce_file() was modified to preserve unfinished file buffers in cl.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 20 Jan 2017 21:12:48 +0300
parents 8cd97c14b0e2
children d2b2ff157da5
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_stream.h>
#include <nginx.h>


static ngx_int_t ngx_stream_variable_binary_remote_addr(
    ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_remote_addr(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_remote_port(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_proxy_protocol_addr(
    ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_proxy_protocol_port(
    ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_server_addr(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_server_port(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_bytes(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_session_time(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_status(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_connection(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_stream_variable_nginx_version(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_hostname(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_pid(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_msec(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_time_iso8601(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_time_local(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_stream_variable_protocol(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);


static ngx_stream_variable_t  ngx_stream_core_variables[] = {

    { ngx_string("binary_remote_addr"), NULL,
      ngx_stream_variable_binary_remote_addr, 0, 0, 0 },

    { ngx_string("remote_addr"), NULL,
      ngx_stream_variable_remote_addr, 0, 0, 0 },

    { ngx_string("remote_port"), NULL,
      ngx_stream_variable_remote_port, 0, 0, 0 },

    { ngx_string("proxy_protocol_addr"), NULL,
      ngx_stream_variable_proxy_protocol_addr, 0, 0, 0 },

    { ngx_string("proxy_protocol_port"), NULL,
      ngx_stream_variable_proxy_protocol_port, 0, 0, 0 },

    { ngx_string("server_addr"), NULL,
      ngx_stream_variable_server_addr, 0, 0, 0 },

    { ngx_string("server_port"), NULL,
      ngx_stream_variable_server_port, 0, 0, 0 },

    { ngx_string("bytes_sent"), NULL, ngx_stream_variable_bytes,
      0, 0, 0 },

    { ngx_string("bytes_received"), NULL, ngx_stream_variable_bytes,
      1, 0, 0 },

    { ngx_string("session_time"), NULL, ngx_stream_variable_session_time,
      0, NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("status"), NULL, ngx_stream_variable_status,
      0, NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("connection"), NULL,
      ngx_stream_variable_connection, 0, 0, 0 },

    { ngx_string("nginx_version"), NULL, ngx_stream_variable_nginx_version,
      0, 0, 0 },

    { ngx_string("hostname"), NULL, ngx_stream_variable_hostname,
      0, 0, 0 },

    { ngx_string("pid"), NULL, ngx_stream_variable_pid,
      0, 0, 0 },

    { ngx_string("msec"), NULL, ngx_stream_variable_msec,
      0, NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("time_iso8601"), NULL, ngx_stream_variable_time_iso8601,
      0, NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("time_local"), NULL, ngx_stream_variable_time_local,
      0, NGX_STREAM_VAR_NOCACHEABLE, 0 },

    { ngx_string("protocol"), NULL,
      ngx_stream_variable_protocol, 0, 0, 0 },

    { ngx_null_string, NULL, NULL, 0, 0, 0 }
};


ngx_stream_variable_value_t  ngx_stream_variable_null_value =
    ngx_stream_variable("");
ngx_stream_variable_value_t  ngx_stream_variable_true_value =
    ngx_stream_variable("1");


static ngx_uint_t  ngx_stream_variable_depth = 100;


ngx_stream_variable_t *
ngx_stream_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
{
    ngx_int_t                     rc;
    ngx_uint_t                    i;
    ngx_hash_key_t               *key;
    ngx_stream_variable_t        *v;
    ngx_stream_core_main_conf_t  *cmcf;

    if (name->len == 0) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "invalid variable name \"$\"");
        return NULL;
    }

    cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);

    key = cmcf->variables_keys->keys.elts;
    for (i = 0; i < cmcf->variables_keys->keys.nelts; i++) {
        if (name->len != key[i].key.len
            || ngx_strncasecmp(name->data, key[i].key.data, name->len) != 0)
        {
            continue;
        }

        v = key[i].value;

        if (!(v->flags & NGX_STREAM_VAR_CHANGEABLE)) {
            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "the duplicate \"%V\" variable", name);
            return NULL;
        }

        return v;
    }

    v = ngx_palloc(cf->pool, sizeof(ngx_stream_variable_t));
    if (v == NULL) {
        return NULL;
    }

    v->name.len = name->len;
    v->name.data = ngx_pnalloc(cf->pool, name->len);
    if (v->name.data == NULL) {
        return NULL;
    }

    ngx_strlow(v->name.data, name->data, name->len);

    v->set_handler = NULL;
    v->get_handler = NULL;
    v->data = 0;
    v->flags = flags;
    v->index = 0;

    rc = ngx_hash_add_key(cmcf->variables_keys, &v->name, v, 0);

    if (rc == NGX_ERROR) {
        return NULL;
    }

    if (rc == NGX_BUSY) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "conflicting variable name \"%V\"", name);
        return NULL;
    }

    return v;
}


ngx_int_t
ngx_stream_get_variable_index(ngx_conf_t *cf, ngx_str_t *name)
{
    ngx_uint_t                    i;
    ngx_stream_variable_t        *v;
    ngx_stream_core_main_conf_t  *cmcf;

    if (name->len == 0) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                           "invalid variable name \"$\"");
        return NGX_ERROR;
    }

    cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);

    v = cmcf->variables.elts;

    if (v == NULL) {
        if (ngx_array_init(&cmcf->variables, cf->pool, 4,
                           sizeof(ngx_stream_variable_t))
            != NGX_OK)
        {
            return NGX_ERROR;
        }

    } else {
        for (i = 0; i < cmcf->variables.nelts; i++) {
            if (name->len != v[i].name.len
                || ngx_strncasecmp(name->data, v[i].name.data, name->len) != 0)
            {
                continue;
            }

            return i;
        }
    }

    v = ngx_array_push(&cmcf->variables);
    if (v == NULL) {
        return NGX_ERROR;
    }

    v->name.len = name->len;
    v->name.data = ngx_pnalloc(cf->pool, name->len);
    if (v->name.data == NULL) {
        return NGX_ERROR;
    }

    ngx_strlow(v->name.data, name->data, name->len);

    v->set_handler = NULL;
    v->get_handler = NULL;
    v->data = 0;
    v->flags = 0;
    v->index = cmcf->variables.nelts - 1;

    return v->index;
}


ngx_stream_variable_value_t *
ngx_stream_get_indexed_variable(ngx_stream_session_t *s, ngx_uint_t index)
{
    ngx_stream_variable_t        *v;
    ngx_stream_core_main_conf_t  *cmcf;

    cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module);

    if (cmcf->variables.nelts <= index) {
        ngx_log_error(NGX_LOG_ALERT, s->connection->log, 0,
                      "unknown variable index: %ui", index);
        return NULL;
    }

    if (s->variables[index].not_found || s->variables[index].valid) {
        return &s->variables[index];
    }

    v = cmcf->variables.elts;

    if (ngx_stream_variable_depth == 0) {
        ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
                      "cycle while evaluating variable \"%V\"",
                      &v[index].name);
        return NULL;
    }

    ngx_stream_variable_depth--;

    if (v[index].get_handler(s, &s->variables[index], v[index].data)
        == NGX_OK)
    {
        ngx_stream_variable_depth++;

        if (v[index].flags & NGX_STREAM_VAR_NOCACHEABLE) {
            s->variables[index].no_cacheable = 1;
        }

        return &s->variables[index];
    }

    ngx_stream_variable_depth++;

    s->variables[index].valid = 0;
    s->variables[index].not_found = 1;

    return NULL;
}


ngx_stream_variable_value_t *
ngx_stream_get_flushed_variable(ngx_stream_session_t *s, ngx_uint_t index)
{
    ngx_stream_variable_value_t  *v;

    v = &s->variables[index];

    if (v->valid || v->not_found) {
        if (!v->no_cacheable) {
            return v;
        }

        v->valid = 0;
        v->not_found = 0;
    }

    return ngx_stream_get_indexed_variable(s, index);
}


ngx_stream_variable_value_t *
ngx_stream_get_variable(ngx_stream_session_t *s, ngx_str_t *name,
    ngx_uint_t key)
{
    ngx_stream_variable_t        *v;
    ngx_stream_variable_value_t  *vv;
    ngx_stream_core_main_conf_t  *cmcf;

    cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module);

    v = ngx_hash_find(&cmcf->variables_hash, key, name->data, name->len);

    if (v) {
        if (v->flags & NGX_STREAM_VAR_INDEXED) {
            return ngx_stream_get_flushed_variable(s, v->index);
        }

        if (ngx_stream_variable_depth == 0) {
            ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
                          "cycle while evaluating variable \"%V\"", name);
            return NULL;
        }

        ngx_stream_variable_depth--;

        vv = ngx_palloc(s->connection->pool,
                        sizeof(ngx_stream_variable_value_t));

        if (vv && v->get_handler(s, vv, v->data) == NGX_OK) {
            ngx_stream_variable_depth++;
            return vv;
        }

        ngx_stream_variable_depth++;
        return NULL;
    }

    vv = ngx_palloc(s->connection->pool, sizeof(ngx_stream_variable_value_t));
    if (vv == NULL) {
        return NULL;
    }

    vv->not_found = 1;

    return vv;
}


static ngx_int_t
ngx_stream_variable_binary_remote_addr(ngx_stream_session_t *s,
     ngx_stream_variable_value_t *v, uintptr_t data)
 {
    struct sockaddr_in   *sin;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6  *sin6;
#endif

    switch (s->connection->sockaddr->sa_family) {

#if (NGX_HAVE_INET6)
    case AF_INET6:
        sin6 = (struct sockaddr_in6 *) s->connection->sockaddr;

        v->len = sizeof(struct in6_addr);
        v->valid = 1;
        v->no_cacheable = 0;
        v->not_found = 0;
        v->data = sin6->sin6_addr.s6_addr;

        break;
#endif

    default: /* AF_INET */
        sin = (struct sockaddr_in *) s->connection->sockaddr;

        v->len = sizeof(in_addr_t);
        v->valid = 1;
        v->no_cacheable = 0;
        v->not_found = 0;
        v->data = (u_char *) &sin->sin_addr;

        break;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_remote_addr(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    v->len = s->connection->addr_text.len;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = s->connection->addr_text.data;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_remote_port(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    ngx_uint_t  port;

    v->len = 0;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    v->data = ngx_pnalloc(s->connection->pool, sizeof("65535") - 1);
    if (v->data == NULL) {
        return NGX_ERROR;
    }

    port = ngx_inet_get_port(s->connection->sockaddr);

    if (port > 0 && port < 65536) {
        v->len = ngx_sprintf(v->data, "%ui", port) - v->data;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_proxy_protocol_addr(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    v->len = s->connection->proxy_protocol_addr.len;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = s->connection->proxy_protocol_addr.data;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_proxy_protocol_port(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    ngx_uint_t  port;

    v->len = 0;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    v->data = ngx_pnalloc(s->connection->pool, sizeof("65535") - 1);
    if (v->data == NULL) {
        return NGX_ERROR;
    }

    port = s->connection->proxy_protocol_port;

    if (port > 0 && port < 65536) {
        v->len = ngx_sprintf(v->data, "%ui", port) - v->data;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_server_addr(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    ngx_str_t  str;
    u_char     addr[NGX_SOCKADDR_STRLEN];

    str.len = NGX_SOCKADDR_STRLEN;
    str.data = addr;

    if (ngx_connection_local_sockaddr(s->connection, &str, 0) != NGX_OK) {
        return NGX_ERROR;
    }

    str.data = ngx_pnalloc(s->connection->pool, str.len);
    if (str.data == NULL) {
        return NGX_ERROR;
    }

    ngx_memcpy(str.data, addr, str.len);

    v->len = str.len;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = str.data;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_server_port(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    ngx_uint_t  port;

    v->len = 0;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    if (ngx_connection_local_sockaddr(s->connection, NULL, 0) != NGX_OK) {
        return NGX_ERROR;
    }

    v->data = ngx_pnalloc(s->connection->pool, sizeof("65535") - 1);
    if (v->data == NULL) {
        return NGX_ERROR;
    }

    port = ngx_inet_get_port(s->connection->local_sockaddr);

    if (port > 0 && port < 65536) {
        v->len = ngx_sprintf(v->data, "%ui", port) - v->data;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_bytes(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char  *p;

    p = ngx_pnalloc(s->connection->pool, NGX_OFF_T_LEN);
    if (p == NULL) {
        return NGX_ERROR;
    }

    if (data == 1) {
        v->len = ngx_sprintf(p, "%O", s->received) - p;

    } else {
        v->len = ngx_sprintf(p, "%O", s->connection->sent) - p;
    }

    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = p;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_session_time(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char          *p;
    ngx_time_t      *tp;
    ngx_msec_int_t   ms;

    p = ngx_pnalloc(s->connection->pool, NGX_TIME_T_LEN + 4);
    if (p == NULL) {
        return NGX_ERROR;
    }

    tp = ngx_timeofday();

    ms = (ngx_msec_int_t)
             ((tp->sec - s->start_sec) * 1000 + (tp->msec - s->start_msec));
    ms = ngx_max(ms, 0);

    v->len = ngx_sprintf(p, "%T.%03M", (time_t) ms / 1000, ms % 1000) - p;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = p;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_status(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    v->data = ngx_pnalloc(s->connection->pool, NGX_INT_T_LEN);
    if (v->data == NULL) {
        return NGX_ERROR;
    }

    v->len = ngx_sprintf(v->data, "%03ui", s->status) - v->data;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_connection(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char  *p;

    p = ngx_pnalloc(s->connection->pool, NGX_ATOMIC_T_LEN);
    if (p == NULL) {
        return NGX_ERROR;
    }

    v->len = ngx_sprintf(p, "%uA", s->connection->number) - p;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = p;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_nginx_version(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    v->len = sizeof(NGINX_VERSION) - 1;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = (u_char *) NGINX_VERSION;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_hostname(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    v->len = ngx_cycle->hostname.len;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = ngx_cycle->hostname.data;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_pid(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char  *p;

    p = ngx_pnalloc(s->connection->pool, NGX_INT64_LEN);
    if (p == NULL) {
        return NGX_ERROR;
    }

    v->len = ngx_sprintf(p, "%P", ngx_pid) - p;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = p;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_msec(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char      *p;
    ngx_time_t  *tp;

    p = ngx_pnalloc(s->connection->pool, NGX_TIME_T_LEN + 4);
    if (p == NULL) {
        return NGX_ERROR;
    }

    tp = ngx_timeofday();

    v->len = ngx_sprintf(p, "%T.%03M", tp->sec, tp->msec) - p;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = p;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_time_iso8601(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char  *p;

    p = ngx_pnalloc(s->connection->pool, ngx_cached_http_log_iso8601.len);
    if (p == NULL) {
        return NGX_ERROR;
    }

    ngx_memcpy(p, ngx_cached_http_log_iso8601.data,
               ngx_cached_http_log_iso8601.len);

    v->len = ngx_cached_http_log_iso8601.len;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = p;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_time_local(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    u_char  *p;

    p = ngx_pnalloc(s->connection->pool, ngx_cached_http_log_time.len);
    if (p == NULL) {
        return NGX_ERROR;
    }

    ngx_memcpy(p, ngx_cached_http_log_time.data, ngx_cached_http_log_time.len);

    v->len = ngx_cached_http_log_time.len;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = p;

    return NGX_OK;
}


static ngx_int_t
ngx_stream_variable_protocol(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    v->len = 3;
    v->valid = 1;
    v->no_cacheable = 0;
    v->not_found = 0;
    v->data = (u_char *) (s->connection->type == SOCK_DGRAM ? "UDP" : "TCP");

    return NGX_OK;
}


void *
ngx_stream_map_find(ngx_stream_session_t *s, ngx_stream_map_t *map,
    ngx_str_t *match)
{
    void        *value;
    u_char      *low;
    size_t       len;
    ngx_uint_t   key;

    len = match->len;

    if (len) {
        low = ngx_pnalloc(s->connection->pool, len);
        if (low == NULL) {
            return NULL;
        }

    } else {
        low = NULL;
    }

    key = ngx_hash_strlow(low, match->data, len);

    value = ngx_hash_find_combined(&map->hash, key, low, len);
    if (value) {
        return value;
    }

#if (NGX_PCRE)

    if (len && map->nregex) {
        ngx_int_t                n;
        ngx_uint_t               i;
        ngx_stream_map_regex_t  *reg;

        reg = map->regex;

        for (i = 0; i < map->nregex; i++) {

            n = ngx_stream_regex_exec(s, reg[i].regex, match);

            if (n == NGX_OK) {
                return reg[i].value;
            }

            if (n == NGX_DECLINED) {
                continue;
            }

            /* NGX_ERROR */

            return NULL;
        }
    }

#endif

    return NULL;
}


#if (NGX_PCRE)

static ngx_int_t
ngx_stream_variable_not_found(ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data)
{
    v->not_found = 1;
    return NGX_OK;
}


ngx_stream_regex_t *
ngx_stream_regex_compile(ngx_conf_t *cf, ngx_regex_compile_t *rc)
{
    u_char                       *p;
    size_t                        size;
    ngx_str_t                     name;
    ngx_uint_t                    i, n;
    ngx_stream_variable_t        *v;
    ngx_stream_regex_t           *re;
    ngx_stream_regex_variable_t  *rv;
    ngx_stream_core_main_conf_t  *cmcf;

    rc->pool = cf->pool;

    if (ngx_regex_compile(rc) != NGX_OK) {
        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc->err);
        return NULL;
    }

    re = ngx_pcalloc(cf->pool, sizeof(ngx_stream_regex_t));
    if (re == NULL) {
        return NULL;
    }

    re->regex = rc->regex;
    re->ncaptures = rc->captures;
    re->name = rc->pattern;

    cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
    cmcf->ncaptures = ngx_max(cmcf->ncaptures, re->ncaptures);

    n = (ngx_uint_t) rc->named_captures;

    if (n == 0) {
        return re;
    }

    rv = ngx_palloc(rc->pool, n * sizeof(ngx_stream_regex_variable_t));
    if (rv == NULL) {
        return NULL;
    }

    re->variables = rv;
    re->nvariables = n;

    size = rc->name_size;
    p = rc->names;

    for (i = 0; i < n; i++) {
        rv[i].capture = 2 * ((p[0] << 8) + p[1]);

        name.data = &p[2];
        name.len = ngx_strlen(name.data);

        v = ngx_stream_add_variable(cf, &name, NGX_STREAM_VAR_CHANGEABLE);
        if (v == NULL) {
            return NULL;
        }

        rv[i].index = ngx_stream_get_variable_index(cf, &name);
        if (rv[i].index == NGX_ERROR) {
            return NULL;
        }

        v->get_handler = ngx_stream_variable_not_found;

        p += size;
    }

    return re;
}


ngx_int_t
ngx_stream_regex_exec(ngx_stream_session_t *s, ngx_stream_regex_t *re,
    ngx_str_t *str)
{
    ngx_int_t                     rc, index;
    ngx_uint_t                    i, n, len;
    ngx_stream_variable_value_t  *vv;
    ngx_stream_core_main_conf_t  *cmcf;

    cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module);

    if (re->ncaptures) {
        len = cmcf->ncaptures;

        if (s->captures == NULL) {
            s->captures = ngx_palloc(s->connection->pool, len * sizeof(int));
            if (s->captures == NULL) {
                return NGX_ERROR;
            }
        }

    } else {
        len = 0;
    }

    rc = ngx_regex_exec(re->regex, str, s->captures, len);

    if (rc == NGX_REGEX_NO_MATCHED) {
        return NGX_DECLINED;
    }

    if (rc < 0) {
        ngx_log_error(NGX_LOG_ALERT, s->connection->log, 0,
                      ngx_regex_exec_n " failed: %i on \"%V\" using \"%V\"",
                      rc, str, &re->name);
        return NGX_ERROR;
    }

    for (i = 0; i < re->nvariables; i++) {

        n = re->variables[i].capture;
        index = re->variables[i].index;
        vv = &s->variables[index];

        vv->len = s->captures[n + 1] - s->captures[n];
        vv->valid = 1;
        vv->no_cacheable = 0;
        vv->not_found = 0;
        vv->data = &str->data[s->captures[n]];

#if (NGX_DEBUG)
        {
        ngx_stream_variable_t  *v;

        v = cmcf->variables.elts;

        ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
                       "stream regex set $%V to \"%v\"", &v[index].name, vv);
        }
#endif
    }

    s->ncaptures = rc * 2;
    s->captures_data = str->data;

    return NGX_OK;
}

#endif


ngx_int_t
ngx_stream_variables_add_core_vars(ngx_conf_t *cf)
{
    ngx_int_t                     rc;
    ngx_stream_variable_t        *cv, *v;
    ngx_stream_core_main_conf_t  *cmcf;

    cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);

    cmcf->variables_keys = ngx_pcalloc(cf->temp_pool,
                                       sizeof(ngx_hash_keys_arrays_t));
    if (cmcf->variables_keys == NULL) {
        return NGX_ERROR;
    }

    cmcf->variables_keys->pool = cf->pool;
    cmcf->variables_keys->temp_pool = cf->pool;

    if (ngx_hash_keys_array_init(cmcf->variables_keys, NGX_HASH_SMALL)
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    for (cv = ngx_stream_core_variables; cv->name.len; cv++) {
        v = ngx_palloc(cf->pool, sizeof(ngx_stream_variable_t));
        if (v == NULL) {
            return NGX_ERROR;
        }

        *v = *cv;

        rc = ngx_hash_add_key(cmcf->variables_keys, &v->name, v,
                              NGX_HASH_READONLY_KEY);

        if (rc == NGX_OK) {
            continue;
        }

        if (rc == NGX_BUSY) {
            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                               "conflicting variable name \"%V\"", &v->name);
        }

        return NGX_ERROR;
    }

    return NGX_OK;
}


ngx_int_t
ngx_stream_variables_init_vars(ngx_conf_t *cf)
{
    ngx_uint_t                    i, n;
    ngx_hash_key_t               *key;
    ngx_hash_init_t               hash;
    ngx_stream_variable_t        *v, *av;
    ngx_stream_core_main_conf_t  *cmcf;

    /* set the handlers for the indexed stream variables */

    cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);

    v = cmcf->variables.elts;
    key = cmcf->variables_keys->keys.elts;

    for (i = 0; i < cmcf->variables.nelts; i++) {

        for (n = 0; n < cmcf->variables_keys->keys.nelts; n++) {

            av = key[n].value;

            if (v[i].name.len == key[n].key.len
                && ngx_strncmp(v[i].name.data, key[n].key.data, v[i].name.len)
                   == 0)
            {
                v[i].get_handler = av->get_handler;
                v[i].data = av->data;

                av->flags |= NGX_STREAM_VAR_INDEXED;
                v[i].flags = av->flags;

                av->index = i;

                if (av->get_handler == NULL) {
                    break;
                }

                goto next;
            }
        }

        ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
                      "unknown \"%V\" variable", &v[i].name);

        return NGX_ERROR;

    next:
        continue;
    }


    for (n = 0; n < cmcf->variables_keys->keys.nelts; n++) {
        av = key[n].value;

        if (av->flags & NGX_STREAM_VAR_NOHASH) {
            key[n].key.data = NULL;
        }
    }


    hash.hash = &cmcf->variables_hash;
    hash.key = ngx_hash_key;
    hash.max_size = cmcf->variables_hash_max_size;
    hash.bucket_size = cmcf->variables_hash_bucket_size;
    hash.name = "variables_hash";
    hash.pool = cf->pool;
    hash.temp_pool = NULL;

    if (ngx_hash_init(&hash, cmcf->variables_keys->keys.elts,
                      cmcf->variables_keys->keys.nelts)
        != NGX_OK)
    {
        return NGX_ERROR;
    }

    cmcf->variables_keys = NULL;

    return NGX_OK;
}