view src/http/modules/ngx_http_stub_status_module.c @ 5762:b522d5b137fd

SPDY: fix support for headers with multiple values. Split SPDY header with multiple, NULL-separated values: cookie: foo\0bar into two separate HTTP headers with the same name: cookie: foo cookie: bar Even though the logic for this behavior already existed in the source code, it doesn't look that it ever worked and SPDY streams with such headers were simply rejected. Signed-off-by: Piotr Sikora <piotr@cloudflare.com>
author Piotr Sikora <piotr@cloudflare.com>
date Tue, 08 Jul 2014 02:17:44 -0700
parents 2cfc095a607a
children dc7c139fca21
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/*
 * 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_stub_status_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_stub_status_add_variables(ngx_conf_t *cf);

static char *ngx_http_set_status(ngx_conf_t *cf, ngx_command_t *cmd,
                                 void *conf);

static ngx_command_t  ngx_http_status_commands[] = {

    { ngx_string("stub_status"),
      NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
      ngx_http_set_status,
      0,
      0,
      NULL },

      ngx_null_command
};



static ngx_http_module_t  ngx_http_stub_status_module_ctx = {
    ngx_http_stub_status_add_variables,    /* preconfiguration */
    NULL,                                  /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    NULL,                                  /* create server configuration */
    NULL,                                  /* merge server configuration */

    NULL,                                  /* create location configuration */
    NULL                                   /* merge location configuration */
};


ngx_module_t  ngx_http_stub_status_module = {
    NGX_MODULE_V1,
    &ngx_http_stub_status_module_ctx,      /* module context */
    ngx_http_status_commands,              /* module directives */
    NGX_HTTP_MODULE,                       /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static ngx_http_variable_t  ngx_http_stub_status_vars[] = {

    { ngx_string("connections_active"), NULL, ngx_http_stub_status_variable,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("connections_reading"), NULL, ngx_http_stub_status_variable,
      1, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("connections_writing"), NULL, ngx_http_stub_status_variable,
      2, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("connections_waiting"), NULL, ngx_http_stub_status_variable,
      3, NGX_HTTP_VAR_NOCACHEABLE, 0 },

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


static ngx_int_t ngx_http_status_handler(ngx_http_request_t *r)
{
    size_t             size;
    ngx_int_t          rc;
    ngx_buf_t         *b;
    ngx_chain_t        out;
    ngx_atomic_int_t   ap, hn, ac, rq, rd, wr, wa;

    if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
        return NGX_HTTP_NOT_ALLOWED;
    }

    rc = ngx_http_discard_request_body(r);

    if (rc != NGX_OK) {
        return rc;
    }

    r->headers_out.content_type_len = sizeof("text/plain") - 1;
    ngx_str_set(&r->headers_out.content_type, "text/plain");
    r->headers_out.content_type_lowcase = NULL;

    if (r->method == NGX_HTTP_HEAD) {
        r->headers_out.status = NGX_HTTP_OK;

        rc = ngx_http_send_header(r);

        if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
            return rc;
        }
    }

    size = sizeof("Active connections:  \n") + NGX_ATOMIC_T_LEN
           + sizeof("server accepts handled requests\n") - 1
           + 6 + 3 * NGX_ATOMIC_T_LEN
           + sizeof("Reading:  Writing:  Waiting:  \n") + 3 * NGX_ATOMIC_T_LEN;

    b = ngx_create_temp_buf(r->pool, size);
    if (b == NULL) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    out.buf = b;
    out.next = NULL;

    ap = *ngx_stat_accepted;
    hn = *ngx_stat_handled;
    ac = *ngx_stat_active;
    rq = *ngx_stat_requests;
    rd = *ngx_stat_reading;
    wr = *ngx_stat_writing;
    wa = *ngx_stat_waiting;

    b->last = ngx_sprintf(b->last, "Active connections: %uA \n", ac);

    b->last = ngx_cpymem(b->last, "server accepts handled requests\n",
                         sizeof("server accepts handled requests\n") - 1);

    b->last = ngx_sprintf(b->last, " %uA %uA %uA \n", ap, hn, rq);

    b->last = ngx_sprintf(b->last, "Reading: %uA Writing: %uA Waiting: %uA \n",
                          rd, wr, wa);

    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_length_n = b->last - b->pos;

    b->last_buf = (r == r->main) ? 1 : 0;
    b->last_in_chain = 1;

    rc = ngx_http_send_header(r);

    if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
        return rc;
    }

    return ngx_http_output_filter(r, &out);
}


static ngx_int_t
ngx_http_stub_status_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data)
{
    u_char            *p;
    ngx_atomic_int_t   value;

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

    switch (data) {
    case 0:
        value = *ngx_stat_active;
        break;

    case 1:
        value = *ngx_stat_reading;
        break;

    case 2:
        value = *ngx_stat_writing;
        break;

    case 3:
        value = *ngx_stat_waiting;
        break;

    /* suppress warning */
    default:
        value = 0;
        break;
    }

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

    return NGX_OK;
}


static ngx_int_t
ngx_http_stub_status_add_variables(ngx_conf_t *cf)
{
    ngx_http_variable_t  *var, *v;

    for (v = ngx_http_stub_status_vars; v->name.len; v++) {
        var = ngx_http_add_variable(cf, &v->name, v->flags);
        if (var == NULL) {
            return NGX_ERROR;
        }

        var->get_handler = v->get_handler;
        var->data = v->data;
    }

    return NGX_OK;
}


static char *ngx_http_set_status(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_http_core_loc_conf_t  *clcf;

    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
    clcf->handler = ngx_http_status_handler;

    return NGX_CONF_OK;
}