apache2 forward proxy

[jlarry3]

Problem description
on Android 10 running apache2, module mod_proxy loads OK, but mod_proxy_http, mod_proxy_connect, and mod_proxy_ftp will not load because they cannot find certain symbols:

httpd: Syntax error on line 129 of /data/data/com.termux/files/usr/etc/apache2/httpd.conf: Cannot load libexec/apache2/mod_proxy_http.so into server: dlopen failed: cannot locate symbol "ap_proxy_cookie_reverse_map" referenced by "/data/data/com.termux/files/usr/libexec/apache2/mod_proxy_http.so"...

httpd: Syntax error on line 129 of /data/data/com.termux/files/usr/etc/apache2/httpd.conf: Cannot load libexec/apache2/mod_proxy_connect.so into server: dlopen failed: cannot locate symbol "proxy_hook_scheme_handler" referenced by "/data/data/com.termux/files/usr/libexec/apache2/mod_proxy_connect.so"...

httpd: Syntax error on line 129 of /data/data/com.termux/files/usr/etc/apache2/httpd.conf: Cannot load libexec/apache2/mod_proxy_ftp.so into server: dlopen failed: cannot locate symbol "proxy_hook_scheme_handler" referenced by "/data/data/com.termux/files/usr/libexec/apache2/mod_proxy_ftp.so"...

You get one message, for whichever module is first in httpd.conf.

httpd -V gives:
Server version: Apache/2.4.43 (Unix)
Server built: Apr 3 2020 15:39:28
Server's Module Magic Number: 20120211:92
Server loaded: APR 1.7.0, APR-UTIL 1.6.1
Compiled using: APR 1.7.0, APR-UTIL 1.6.1
Architecture: 64-bit
Server MPM: worker
threaded: yes (fixed thread count)
forked: yes (variable process count)
Server compiled with....
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_FCNTL_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=256
-D HTTPD_ROOT="/data/data/com.termux/files/usr"
-D SUEXEC_BIN="/data/data/com.termux/files/usr/bin/suexec"
-D DEFAULT_PIDLOG="var/run/apache2/httpd.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="etc/apache2/mime.types"
-D SERVER_CONFIG_FILE="etc/apache2/httpd.conf"

uname -a
Linux localhost 4.14.117-18242889 #2 SMP PREEMPT Fri Mar 20 20:23:00 KST 2020 aarch64 Android

To reproduce error:

install and start apache2
cd data/data/com.termux/files/usr/etc/apache2
edit httpd.conf:
remove '#' in front of each of these lines:

LoadModule proxy_module libexec/apache2/mod_proxy.so
LoadModule proxy_ftp_module libexec/apache2/mod_proxy_ftp.so
LoadModule proxy_connect_module libexec/apache2/mod_proxy_connect.so
LoadModule proxy_http_module libexec/apache2/mod_proxy_http.so

execute apachectl restart

Expected behavior

Expect no error messages and modules get loaded

Additional information

$ termux-info
Packages CPU architecture:
aarch64
Subscribed repositories:
# sources.list
deb https://termux.org/packages/ stable main
# root-repo (sources.list.d/root.list)
deb https://dl.bintray.com/grimler/termux-root-packages-24 root stable
# game-repo (sources.list.d/game.list)
deb https://dl.bintray.com/grimler/game-packages-24 games stable
# science-repo (sources.list.d/science.list)
deb https://dl.bintray.com/grimler/science-packages-24 science stable
Updatable packages:
All packages up to date
Android version:
10
Kernel build information:
Linux localhost 4.14.117-18242889 #2 SMP PREEMPT Fri Mar 20 20:23:00 KST 2020 aarch64 Android
Device manufacturer:
samsung
Device model:
SM-G970U

[mks-h]

Something similar for mod_proxy_fcgi.so

httpd: Syntax error on line 27 of /data/data/com.termux/files/usr/etc/apache2/httpd.conf: Cannot load libexec/apache2/mod_proxy_fcgi.so into server: dlopen failed: cannot locate symbol "proxy_module" referenced by "/data/data/com.termux/files/usr/libexec/apache2/mod_proxy_fcgi.so"...

Mine system is LineageOS 17.1 (Android 10).

Packages CPU architecture:
aarch64
All packages up to date
Android version:
10
Kernel build information:
Linux localhost 4.4.205-gae9fcc9 #1 SMP PREEMPT Tue Jul 14 06:04:05 UTC 2020 aarch64 Android
Device manufacturer:
Sony
Device model:
I4113


Server version: Apache/2.4.43 (Unix)
Server built:   Apr  3 2020 15:39:28
Server's Module Magic Number: 20120211:92
Server loaded:  APR 1.7.0, APR-UTIL 1.6.1
Compiled using: APR 1.7.0, APR-UTIL 1.6.1
Architecture:   64-bit
Server MPM:     worker
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_FCNTL_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/data/data/com.termux/files/usr"
 -D SUEXEC_BIN="/data/data/com.termux/files/usr/bin/suexec"
 -D DEFAULT_PIDLOG="var/run/apache2/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="etc/apache2/mime.types"
 -D SERVER_CONFIG_FILE="etc/apache2/httpd.conf"

[Grimler91]

I am closing this in favor of issue #2479 so that we are tracking this in a single issue. This type of issue happens for quite a few plugins, one workaround is to export LD_PRELOAD=$PREFIX/libexec/apache2/mod_proxy.so before starting httpd.

I am using a termux-services script containing

#!/data/data/com.termux/files/usr/bin/sh
export LD_PRELOAD=$PREFIX/libexec/apache2/mod_proxy.so
exec httpd -f $HOME/apache2/httpd.conf -DNO_DETACH 2>&1

to workaround this issue.

[tinboyko]

Same issue for me.

Official rom
Redmi note 4x
Android 7

After applying your workaround getting next error [Tue Jul 21 13:47:01.280933 2020] [proxy:warn] [pid 11778] [client 192.168.43.131:49252] AH01144: No protocol handler was valid for the URL / (scheme 'http'). If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

[Grimler91]

After applying your workaround getting next error

That's a warning, not an error. Try changing your config file as per the message to silence it