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Resolver: fixed use-after-free memory accesses with CNAME. When several requests were waiting for a response, then after getting a CNAME response only the last request's context had the name updated. Contexts of other requests had the wrong name. This name was used by ngx_resolve_name_done() to find the node to remove the request context from. When the name was wrong, the request could not be properly cancelled, its context was freed but stayed linked to the node's waiting list. This happened e.g. when the first request was aborted or timed out before the resolving completed. When it completed, this triggered a use-after-free memory access by calling ctx->handler of already freed request context. The bug manifests itself by "could not cancel <name> resolving" alerts in error_log. When a request was responded with a CNAME, the request context kept the pointer to the original node's rn->u.cname. If the original node expired before the resolving timed out or completed with an error, this would trigger a use-after-free memory access via ctx->name in ctx->handler(). The fix is to keep ctx->name unmodified. The name from context is no longer used by ngx_resolve_name_done(). Instead, we now keep the pointer to resolver node to which this request is linked. Keeping the original name intact also improves logging.
author Roman Arutyunyan <arut@nginx.com>
date Tue, 26 Jan 2016 16:46:59 +0300
parents 29f35e60840b
children 85dea406e18f
line wrap: on
line source


# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


help=no

NGX_PREFIX=
NGX_SBIN_PATH=
NGX_CONF_PREFIX=
NGX_CONF_PATH=
NGX_ERROR_LOG_PATH=
NGX_PID_PATH=
NGX_LOCK_PATH=
NGX_USER=
NGX_GROUP=
NGX_BUILD=

CC=${CC:-cc}
CPP=
NGX_OBJS=objs

NGX_DEBUG=NO
NGX_CC_OPT=
NGX_LD_OPT=
CPU=NO

NGX_RPATH=NO

NGX_TEST_BUILD_DEVPOLL=NO
NGX_TEST_BUILD_EVENTPORT=NO
NGX_TEST_BUILD_EPOLL=NO
NGX_TEST_BUILD_SOLARIS_SENDFILEV=NO

NGX_PLATFORM=
NGX_WINE=

EVENT_FOUND=NO

EVENT_SELECT=NO
EVENT_POLL=NO

USE_THREADS=NO

NGX_FILE_AIO=NO
NGX_IPV6=NO

HTTP=YES

NGX_HTTP_LOG_PATH=
NGX_HTTP_CLIENT_TEMP_PATH=
NGX_HTTP_PROXY_TEMP_PATH=
NGX_HTTP_FASTCGI_TEMP_PATH=
NGX_HTTP_UWSGI_TEMP_PATH=
NGX_HTTP_SCGI_TEMP_PATH=

HTTP_CACHE=YES
HTTP_CHARSET=YES
HTTP_GZIP=YES
HTTP_SSL=NO
HTTP_V2=NO
HTTP_SSI=YES
HTTP_POSTPONE=NO
HTTP_REALIP=NO
HTTP_XSLT=NO
HTTP_IMAGE_FILTER=NO
HTTP_SUB=NO
HTTP_ADDITION=NO
HTTP_DAV=NO
HTTP_ACCESS=YES
HTTP_AUTH_BASIC=YES
HTTP_AUTH_REQUEST=NO
HTTP_USERID=YES
HTTP_SLICE=NO
HTTP_AUTOINDEX=YES
HTTP_RANDOM_INDEX=NO
HTTP_STATUS=NO
HTTP_GEO=YES
HTTP_GEOIP=NO
HTTP_MAP=YES
HTTP_SPLIT_CLIENTS=YES
HTTP_REFERER=YES
HTTP_REWRITE=YES
HTTP_PROXY=YES
HTTP_FASTCGI=YES
HTTP_UWSGI=YES
HTTP_SCGI=YES
HTTP_PERL=NO
HTTP_MEMCACHED=YES
HTTP_LIMIT_CONN=YES
HTTP_LIMIT_REQ=YES
HTTP_EMPTY_GIF=YES
HTTP_BROWSER=YES
HTTP_SECURE_LINK=NO
HTTP_DEGRADATION=NO
HTTP_FLV=NO
HTTP_MP4=NO
HTTP_GUNZIP=NO
HTTP_GZIP_STATIC=NO
HTTP_UPSTREAM_HASH=YES
HTTP_UPSTREAM_IP_HASH=YES
HTTP_UPSTREAM_LEAST_CONN=YES
HTTP_UPSTREAM_KEEPALIVE=YES
HTTP_UPSTREAM_ZONE=YES

# STUB
HTTP_STUB_STATUS=NO

MAIL=NO
MAIL_SSL=NO
MAIL_POP3=YES
MAIL_IMAP=YES
MAIL_SMTP=YES

STREAM=NO
STREAM_SSL=NO
STREAM_LIMIT_CONN=YES
STREAM_ACCESS=YES
STREAM_UPSTREAM_HASH=YES
STREAM_UPSTREAM_LEAST_CONN=YES
STREAM_UPSTREAM_ZONE=YES

NGX_ADDONS=

USE_PCRE=NO
PCRE=NONE
PCRE_OPT=
PCRE_CONF_OPT=
PCRE_JIT=NO

USE_OPENSSL=NO
OPENSSL=NONE

USE_MD5=NO
MD5=NONE
MD5_OPT=
MD5_ASM=NO

USE_SHA1=NO
SHA1=NONE
SHA1_OPT=
SHA1_ASM=NO

USE_ZLIB=NO
ZLIB=NONE
ZLIB_OPT=
ZLIB_ASM=NO

USE_PERL=NO
NGX_PERL=perl

USE_LIBXSLT=NO
USE_LIBGD=NO

NGX_GOOGLE_PERFTOOLS=NO
NGX_CPP_TEST=NO

NGX_LIBATOMIC=NO

NGX_CPU_CACHE_LINE=

NGX_POST_CONF_MSG=

opt=

for option
do
    opt="$opt `echo $option | sed -e \"s/\(--[^=]*=\)\(.* .*\)/\1'\2'/\"`"

    case "$option" in
        -*=*) value=`echo "$option" | sed -e 's/[-_a-zA-Z0-9]*=//'` ;;
           *) value="" ;;
    esac

    case "$option" in
        --help)                          help=yes                   ;;

        --prefix=)                       NGX_PREFIX="!"             ;;
        --prefix=*)                      NGX_PREFIX="$value"        ;;
        --sbin-path=*)                   NGX_SBIN_PATH="$value"     ;;
        --conf-path=*)                   NGX_CONF_PATH="$value"     ;;
        --error-log-path=*)              NGX_ERROR_LOG_PATH="$value";;
        --pid-path=*)                    NGX_PID_PATH="$value"      ;;
        --lock-path=*)                   NGX_LOCK_PATH="$value"     ;;
        --user=*)                        NGX_USER="$value"          ;;
        --group=*)                       NGX_GROUP="$value"         ;;

        --crossbuild=*)                  NGX_PLATFORM="$value"      ;;

        --build=*)                       NGX_BUILD="$value"         ;;
        --builddir=*)                    NGX_OBJS="$value"          ;;

        --with-select_module)            EVENT_SELECT=YES           ;;
        --without-select_module)         EVENT_SELECT=NONE          ;;
        --with-poll_module)              EVENT_POLL=YES             ;;
        --without-poll_module)           EVENT_POLL=NONE            ;;

        --with-threads)                  USE_THREADS=YES            ;;

        --with-file-aio)                 NGX_FILE_AIO=YES           ;;
        --with-ipv6)                     NGX_IPV6=YES               ;;

        --without-http)                  HTTP=NO                    ;;
        --without-http-cache)            HTTP_CACHE=NO              ;;

        --http-log-path=*)               NGX_HTTP_LOG_PATH="$value" ;;
        --http-client-body-temp-path=*)  NGX_HTTP_CLIENT_TEMP_PATH="$value" ;;
        --http-proxy-temp-path=*)        NGX_HTTP_PROXY_TEMP_PATH="$value" ;;
        --http-fastcgi-temp-path=*)      NGX_HTTP_FASTCGI_TEMP_PATH="$value" ;;
        --http-uwsgi-temp-path=*)        NGX_HTTP_UWSGI_TEMP_PATH="$value" ;;
        --http-scgi-temp-path=*)         NGX_HTTP_SCGI_TEMP_PATH="$value" ;;

        --with-http_ssl_module)          HTTP_SSL=YES               ;;
        --with-http_v2_module)           HTTP_V2=YES                ;;
        --with-http_realip_module)       HTTP_REALIP=YES            ;;
        --with-http_addition_module)     HTTP_ADDITION=YES          ;;
        --with-http_xslt_module)         HTTP_XSLT=YES              ;;
        --with-http_image_filter_module) HTTP_IMAGE_FILTER=YES      ;;
        --with-http_geoip_module)        HTTP_GEOIP=YES             ;;
        --with-http_sub_module)          HTTP_SUB=YES               ;;
        --with-http_dav_module)          HTTP_DAV=YES               ;;
        --with-http_flv_module)          HTTP_FLV=YES               ;;
        --with-http_mp4_module)          HTTP_MP4=YES               ;;
        --with-http_gunzip_module)       HTTP_GUNZIP=YES            ;;
        --with-http_gzip_static_module)  HTTP_GZIP_STATIC=YES       ;;
        --with-http_auth_request_module) HTTP_AUTH_REQUEST=YES      ;;
        --with-http_random_index_module) HTTP_RANDOM_INDEX=YES      ;;
        --with-http_secure_link_module)  HTTP_SECURE_LINK=YES       ;;
        --with-http_degradation_module)  HTTP_DEGRADATION=YES       ;;
        --with-http_slice_module)        HTTP_SLICE=YES             ;;

        --without-http_charset_module)   HTTP_CHARSET=NO            ;;
        --without-http_gzip_module)      HTTP_GZIP=NO               ;;
        --without-http_ssi_module)       HTTP_SSI=NO                ;;
        --without-http_userid_module)    HTTP_USERID=NO             ;;
        --without-http_access_module)    HTTP_ACCESS=NO             ;;
        --without-http_auth_basic_module) HTTP_AUTH_BASIC=NO        ;;
        --without-http_autoindex_module) HTTP_AUTOINDEX=NO          ;;
        --without-http_status_module)    HTTP_STATUS=NO             ;;
        --without-http_geo_module)       HTTP_GEO=NO                ;;
        --without-http_map_module)       HTTP_MAP=NO                ;;
        --without-http_split_clients_module) HTTP_SPLIT_CLIENTS=NO  ;;
        --without-http_referer_module)   HTTP_REFERER=NO            ;;
        --without-http_rewrite_module)   HTTP_REWRITE=NO            ;;
        --without-http_proxy_module)     HTTP_PROXY=NO              ;;
        --without-http_fastcgi_module)   HTTP_FASTCGI=NO            ;;
        --without-http_uwsgi_module)     HTTP_UWSGI=NO              ;;
        --without-http_scgi_module)      HTTP_SCGI=NO               ;;
        --without-http_memcached_module) HTTP_MEMCACHED=NO          ;;
        --without-http_limit_conn_module) HTTP_LIMIT_CONN=NO        ;;
        --without-http_limit_req_module) HTTP_LIMIT_REQ=NO         ;;
        --without-http_empty_gif_module) HTTP_EMPTY_GIF=NO          ;;
        --without-http_browser_module)   HTTP_BROWSER=NO            ;;
        --without-http_upstream_hash_module) HTTP_UPSTREAM_HASH=NO  ;;
        --without-http_upstream_ip_hash_module) HTTP_UPSTREAM_IP_HASH=NO ;;
        --without-http_upstream_least_conn_module)
                                         HTTP_UPSTREAM_LEAST_CONN=NO ;;
        --without-http_upstream_keepalive_module) HTTP_UPSTREAM_KEEPALIVE=NO ;;
        --without-http_upstream_zone_module) HTTP_UPSTREAM_ZONE=NO  ;;

        --with-http_perl_module)         HTTP_PERL=YES              ;;
        --with-perl_modules_path=*)      NGX_PERL_MODULES="$value"  ;;
        --with-perl=*)                   NGX_PERL="$value"          ;;

        # STUB
        --with-http_stub_status_module)  HTTP_STUB_STATUS=YES       ;;

        --with-mail)                     MAIL=YES                   ;;
        --with-mail_ssl_module)          MAIL_SSL=YES               ;;
        # STUB
        --with-imap)
            MAIL=YES
            NGX_POST_CONF_MSG="$NGX_POST_CONF_MSG
$0: warning: the \"--with-imap\" option is deprecated, \
use the \"--with-mail\" option instead"
        ;;
        --with-imap_ssl_module)
            MAIL_SSL=YES
            NGX_POST_CONF_MSG="$NGX_POST_CONF_MSG
$0: warning: the \"--with-imap_ssl_module\" option is deprecated, \
use the \"--with-mail_ssl_module\" option instead"
        ;;
        --without-mail_pop3_module)      MAIL_POP3=NO               ;;
        --without-mail_imap_module)      MAIL_IMAP=NO               ;;
        --without-mail_smtp_module)      MAIL_SMTP=NO               ;;

        --with-stream)                   STREAM=YES                 ;;
        --with-stream_ssl_module)        STREAM_SSL=YES             ;;
        --without-stream_limit_conn_module)
                                         STREAM_LIMIT_CONN=NO       ;;
        --without-stream_access_module)  STREAM_ACCESS=NO           ;;
        --without-stream_upstream_hash_module)
                                         STREAM_UPSTREAM_HASH=NO    ;;
        --without-stream_upstream_least_conn_module)
                                         STREAM_UPSTREAM_LEAST_CONN=NO ;;
        --without-stream_upstream_zone_module)
                                         STREAM_UPSTREAM_ZONE=NO    ;;

        --with-google_perftools_module)  NGX_GOOGLE_PERFTOOLS=YES   ;;
        --with-cpp_test_module)          NGX_CPP_TEST=YES           ;;

        --add-module=*)                  NGX_ADDONS="$NGX_ADDONS $value" ;;

        --with-cc=*)                     CC="$value"                ;;
        --with-cpp=*)                    CPP="$value"               ;;
        --with-cc-opt=*)                 NGX_CC_OPT="$value"        ;;
        --with-ld-opt=*)                 NGX_LD_OPT="$value"        ;;
        --with-cpu-opt=*)                CPU="$value"               ;;
        --with-debug)                    NGX_DEBUG=YES              ;;

        --without-pcre)                  USE_PCRE=DISABLED          ;;
        --with-pcre)                     USE_PCRE=YES               ;;
        --with-pcre=*)                   PCRE="$value"              ;;
        --with-pcre-opt=*)               PCRE_OPT="$value"          ;;
        --with-pcre-jit)                 PCRE_JIT=YES               ;;

        --with-openssl=*)                OPENSSL="$value"           ;;
        --with-openssl-opt=*)            OPENSSL_OPT="$value"       ;;

        --with-md5=*)                    MD5="$value"               ;;
        --with-md5-opt=*)                MD5_OPT="$value"           ;;
        --with-md5-asm)                  MD5_ASM=YES                ;;

        --with-sha1=*)                   SHA1="$value"              ;;
        --with-sha1-opt=*)               SHA1_OPT="$value"          ;;
        --with-sha1-asm)                 SHA1_ASM=YES               ;;

        --with-zlib=*)                   ZLIB="$value"              ;;
        --with-zlib-opt=*)               ZLIB_OPT="$value"          ;;
        --with-zlib-asm=*)               ZLIB_ASM="$value"          ;;

        --with-libatomic)                NGX_LIBATOMIC=YES          ;;
        --with-libatomic=*)              NGX_LIBATOMIC="$value"     ;;

        --test-build-devpoll)            NGX_TEST_BUILD_DEVPOLL=YES ;;
        --test-build-eventport)          NGX_TEST_BUILD_EVENTPORT=YES ;;
        --test-build-epoll)              NGX_TEST_BUILD_EPOLL=YES   ;;
        --test-build-solaris-sendfilev)  NGX_TEST_BUILD_SOLARIS_SENDFILEV=YES ;;

        *)
            echo "$0: error: invalid option \"$option\""
            exit 1
        ;;
    esac
done


NGX_CONFIGURE="$opt"


if [ $help = yes ]; then

cat << END

  --help                             print this message

  --prefix=PATH                      set installation prefix
  --sbin-path=PATH                   set nginx binary pathname
  --conf-path=PATH                   set nginx.conf pathname
  --error-log-path=PATH              set error log pathname
  --pid-path=PATH                    set nginx.pid pathname
  --lock-path=PATH                   set nginx.lock pathname

  --user=USER                        set non-privileged user for
                                     worker processes
  --group=GROUP                      set non-privileged group for
                                     worker processes

  --build=NAME                       set build name
  --builddir=DIR                     set build directory

  --with-select_module               enable select module
  --without-select_module            disable select module
  --with-poll_module                 enable poll module
  --without-poll_module              disable poll module

  --with-threads                     enable thread pool support

  --with-file-aio                    enable file AIO support
  --with-ipv6                        enable IPv6 support

  --with-http_ssl_module             enable ngx_http_ssl_module
  --with-http_v2_module              enable ngx_http_v2_module
  --with-http_realip_module          enable ngx_http_realip_module
  --with-http_addition_module        enable ngx_http_addition_module
  --with-http_xslt_module            enable ngx_http_xslt_module
  --with-http_image_filter_module    enable ngx_http_image_filter_module
  --with-http_geoip_module           enable ngx_http_geoip_module
  --with-http_sub_module             enable ngx_http_sub_module
  --with-http_dav_module             enable ngx_http_dav_module
  --with-http_flv_module             enable ngx_http_flv_module
  --with-http_mp4_module             enable ngx_http_mp4_module
  --with-http_gunzip_module          enable ngx_http_gunzip_module
  --with-http_gzip_static_module     enable ngx_http_gzip_static_module
  --with-http_auth_request_module    enable ngx_http_auth_request_module
  --with-http_random_index_module    enable ngx_http_random_index_module
  --with-http_secure_link_module     enable ngx_http_secure_link_module
  --with-http_degradation_module     enable ngx_http_degradation_module
  --with-http_slice_module           enable ngx_http_slice_module
  --with-http_stub_status_module     enable ngx_http_stub_status_module

  --without-http_charset_module      disable ngx_http_charset_module
  --without-http_gzip_module         disable ngx_http_gzip_module
  --without-http_ssi_module          disable ngx_http_ssi_module
  --without-http_userid_module       disable ngx_http_userid_module
  --without-http_access_module       disable ngx_http_access_module
  --without-http_auth_basic_module   disable ngx_http_auth_basic_module
  --without-http_autoindex_module    disable ngx_http_autoindex_module
  --without-http_geo_module          disable ngx_http_geo_module
  --without-http_map_module          disable ngx_http_map_module
  --without-http_split_clients_module disable ngx_http_split_clients_module
  --without-http_referer_module      disable ngx_http_referer_module
  --without-http_rewrite_module      disable ngx_http_rewrite_module
  --without-http_proxy_module        disable ngx_http_proxy_module
  --without-http_fastcgi_module      disable ngx_http_fastcgi_module
  --without-http_uwsgi_module        disable ngx_http_uwsgi_module
  --without-http_scgi_module         disable ngx_http_scgi_module
  --without-http_memcached_module    disable ngx_http_memcached_module
  --without-http_limit_conn_module   disable ngx_http_limit_conn_module
  --without-http_limit_req_module    disable ngx_http_limit_req_module
  --without-http_empty_gif_module    disable ngx_http_empty_gif_module
  --without-http_browser_module      disable ngx_http_browser_module
  --without-http_upstream_hash_module
                                     disable ngx_http_upstream_hash_module
  --without-http_upstream_ip_hash_module
                                     disable ngx_http_upstream_ip_hash_module
  --without-http_upstream_least_conn_module
                                     disable ngx_http_upstream_least_conn_module
  --without-http_upstream_keepalive_module
                                     disable ngx_http_upstream_keepalive_module
  --without-http_upstream_zone_module
                                     disable ngx_http_upstream_zone_module

  --with-http_perl_module            enable ngx_http_perl_module
  --with-perl_modules_path=PATH      set Perl modules path
  --with-perl=PATH                   set perl binary pathname

  --http-log-path=PATH               set http access log pathname
  --http-client-body-temp-path=PATH  set path to store
                                     http client request body temporary files
  --http-proxy-temp-path=PATH        set path to store
                                     http proxy temporary files
  --http-fastcgi-temp-path=PATH      set path to store
                                     http fastcgi temporary files
  --http-uwsgi-temp-path=PATH        set path to store
                                     http uwsgi temporary files
  --http-scgi-temp-path=PATH         set path to store
                                     http scgi temporary files

  --without-http                     disable HTTP server
  --without-http-cache               disable HTTP cache

  --with-mail                        enable POP3/IMAP4/SMTP proxy module
  --with-mail_ssl_module             enable ngx_mail_ssl_module
  --without-mail_pop3_module         disable ngx_mail_pop3_module
  --without-mail_imap_module         disable ngx_mail_imap_module
  --without-mail_smtp_module         disable ngx_mail_smtp_module

  --with-stream                      enable TCP proxy module
  --with-stream_ssl_module           enable ngx_stream_ssl_module
  --without-stream_limit_conn_module disable ngx_stream_limit_conn_module
  --without-stream_access_module     disable ngx_stream_access_module
  --without-stream_upstream_hash_module
                                     disable ngx_stream_upstream_hash_module
  --without-stream_upstream_least_conn_module
                                     disable ngx_stream_upstream_least_conn_module
  --without-stream_upstream_zone_module
                                     disable ngx_stream_upstream_zone_module

  --with-google_perftools_module     enable ngx_google_perftools_module
  --with-cpp_test_module             enable ngx_cpp_test_module

  --add-module=PATH                  enable an external module

  --with-cc=PATH                     set C compiler pathname
  --with-cpp=PATH                    set C preprocessor pathname
  --with-cc-opt=OPTIONS              set additional C compiler options
  --with-ld-opt=OPTIONS              set additional linker options
  --with-cpu-opt=CPU                 build for the specified CPU, valid values:
                                     pentium, pentiumpro, pentium3, pentium4,
                                     athlon, opteron, sparc32, sparc64, ppc64

  --without-pcre                     disable PCRE library usage
  --with-pcre                        force PCRE library usage
  --with-pcre=DIR                    set path to PCRE library sources
  --with-pcre-opt=OPTIONS            set additional build options for PCRE
  --with-pcre-jit                    build PCRE with JIT compilation support

  --with-md5=DIR                     set path to md5 library sources
  --with-md5-opt=OPTIONS             set additional build options for md5
  --with-md5-asm                     use md5 assembler sources

  --with-sha1=DIR                    set path to sha1 library sources
  --with-sha1-opt=OPTIONS            set additional build options for sha1
  --with-sha1-asm                    use sha1 assembler sources

  --with-zlib=DIR                    set path to zlib library sources
  --with-zlib-opt=OPTIONS            set additional build options for zlib
  --with-zlib-asm=CPU                use zlib assembler sources optimized
                                     for the specified CPU, valid values:
                                     pentium, pentiumpro

  --with-libatomic                   force libatomic_ops library usage
  --with-libatomic=DIR               set path to libatomic_ops library sources

  --with-openssl=DIR                 set path to OpenSSL library sources
  --with-openssl-opt=OPTIONS         set additional build options for OpenSSL

  --with-debug                       enable debug logging

END

    exit 1
fi


if [ $HTTP = NO ]; then
    HTTP_CHARSET=NO
    HTTP_GZIP=NO
    HTTP_SSI=NO
    HTTP_USERID=NO
    HTTP_ACCESS=NO
    HTTP_STATUS=NO
    HTTP_REWRITE=NO
    HTTP_PROXY=NO
    HTTP_FASTCGI=NO
fi


if [ ".$NGX_PLATFORM" = ".win32" ]; then
    NGX_WINE=$WINE
fi


NGX_SBIN_PATH=${NGX_SBIN_PATH:-sbin/nginx}
NGX_CONF_PATH=${NGX_CONF_PATH:-conf/nginx.conf}
NGX_CONF_PREFIX=`dirname $NGX_CONF_PATH`
NGX_PID_PATH=${NGX_PID_PATH:-logs/nginx.pid}
NGX_LOCK_PATH=${NGX_LOCK_PATH:-logs/nginx.lock}

if [ ".$NGX_ERROR_LOG_PATH" = ".stderr" ]; then
    NGX_ERROR_LOG_PATH=
else
    NGX_ERROR_LOG_PATH=${NGX_ERROR_LOG_PATH:-logs/error.log}
fi

NGX_HTTP_LOG_PATH=${NGX_HTTP_LOG_PATH:-logs/access.log}
NGX_HTTP_CLIENT_TEMP_PATH=${NGX_HTTP_CLIENT_TEMP_PATH:-client_body_temp}
NGX_HTTP_PROXY_TEMP_PATH=${NGX_HTTP_PROXY_TEMP_PATH:-proxy_temp}
NGX_HTTP_FASTCGI_TEMP_PATH=${NGX_HTTP_FASTCGI_TEMP_PATH:-fastcgi_temp}
NGX_HTTP_UWSGI_TEMP_PATH=${NGX_HTTP_UWSGI_TEMP_PATH:-uwsgi_temp}
NGX_HTTP_SCGI_TEMP_PATH=${NGX_HTTP_SCGI_TEMP_PATH:-scgi_temp}

case ".$NGX_PERL_MODULES" in
    ./*)
    ;;

    .)
    ;;

    *)
        NGX_PERL_MODULES=$NGX_PREFIX/$NGX_PERL_MODULES
    ;;
esac