Unable to load auth plugin "/home/xueba/tmp/mosquitto-auth-plug/auth-plug.so about mosquitto-auth-plug

[jpmens]

This is probably a duplicate of #33
please see if that solves the problem for you.

[zhangshexin]

Very embrace owe, in "# 33" I asked, because worried that you can't see the separate wrote a title, from last week to now has not solved the problem, I am in the mosquitto config.mk file modified WITH_SRV value is NO. And make again, but still show "unable to load"

[jpmens]

You are not giving me any detail on the steps you took to install Mosquitto with the authentication plugin. Show me what you did, show me your OS version, etc.

[zhangshexin]

ubuntu 14.04

mosquitto version 1.3.5

I use mosquitto - v shows under the terminal
samzhang@samzhang-virtual-machine:~$ /usr/local/mosquitto/sbin/mosquitto -v
1419241438: mosquitto version 1.3.5 (build date 2014-12-19 17:34:38+0800) starting
1419241438: Using default config.
1419241438: Opening ipv4 listen socket on port 1883.
1419241438: Opening ipv6 listen socket on port 1883.

I modified mosquitto.conf file

auth_plugin /home/samzhang/Downloads/mosquitto-auth-plug-master/auth-plug.so
auth_opt_backends MYSQL
#auth_opt_cdbname pwdb.cdb
auth_opt_host 10.2.0.211
auth_opt_port 3306
auth_opt_dbname mqttdb
auth_opt_user root
auth_opt_pass samzhang
auth_opt_userquery SELECT pw FROM users WHERE username = '%s'
auth_opt_superquery SELECT IFNULL(COUNT(*), 0) FROM users WHERE username = '%s' AND super = 1

auth_opt_aclquery SELECT topic FROM acls WHERE username = '%s'

The auth plug config. mk file

BACKEND_CDB ?= no
BACKEND_MYSQL ?= yes
BACKEND_SQLITE ?= no
BACKEND_REDIS ?= no
BACKEND_POSTGRES ?= no
BACKEND_LDAP ?= no
BACKEND_HTTP ?= no

Specify the path to the Mosquitto sources here

MOSQUITTO_SRC =/home/samzhang/mosquitto-1.3.5

Specify the path the OpenSSL here

OPENSSLDIR = /usr

The results of auth plug-in make

samzhang@samzhang-virtual-machine:~/Downloads/mosquitto-auth-plug-master$ make
Selected backends: MySQL
Using mosquitto source dir: /home/samzhang/mosquitto-1.3.5
OpenSSL install dir: /usr

If you changed the backend selection, you might need to 'make clean' first

cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o auth-plug.o auth-plug.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o base64.o base64.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o pbkdf2-check.o pbkdf2-check.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o log.o log.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o hash.o hash.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o be-psk.o be-psk.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o backends.o backends.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o cache.o cache.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -c -o be-mysql.o be-mysql.c
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include -L/home/samzhang/mosquitto-1.3.5/lib/ -lcares -fPIC -shared -o auth-plug.so auth-plug.o base64.o pbkdf2-check.o log.o hash.o be-psk.o backends.o cache.o be-mysql.o mysql_config --libs -L/usr/lib -lcrypto -lmosquitto
cc -I/home/samzhang/mosquitto-1.3.5/src/ -I/home/samzhang/mosquitto-1.3.5/lib/ -fPIC -Wall -Werror -DBE_MYSQL mysql_config --cflags -I/src -DDEBUG=1 -I/usr/include np.c base64.o -o np -L/usr/lib -lcrypto

Successfully obtained auth-plug.so

---

use ldd
samzhang@samzhang-virtual-machine:~/Downloads/mosquitto-auth-plug-master$ ldd auth-plug.so
linux-gate.so.1 => (0xb7788000)
libmysqlclient.so.18 => /usr/lib/i386-linux-gnu/libmysqlclient.so.18 (0xb7439000)
libcrypto.so.1.0.0 => /lib/i386-linux-gnu/libcrypto.so.1.0.0 (0xb728d000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xb70dd000)
libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xb70c3000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xb70be000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xb70a2000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xb705c000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xb703e000)
/lib/ld-linux.so.2 (0xb7789000)

that's all

thank you very much again

[jpmens]

Did you copy auth-plug.so to the path you configured as /home/samzhang/Downloads/mosquitto-auth-plug-master/auth-plug.so?

Have you tried printing the cause of the loader error as described at #33 (comment) ? Please show me that error.

[zhangshexin]

This is my information

samzhang@samzhang-virtual-machine:~$ /usr/local/mosquitto/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf -v
1419301406: mosquitto version 1.3.5 (build date 2014-12-23 10:20:56+0800) starting
1419301406: Config loaded from /etc/mosquitto/mosquitto.conf.
LOADERROR /home/samzhang/Downloads/mosquitto-auth-plug-master/auth-plug.so: undefined symbol: ares_library_init
1419301406: Error: Unable to load auth plugin "/home/samzhang/Downloads/mosquitto-auth-plug-master/auth-plug.so".

Is the same with # 33, but I've put the "WITH_SRV: = yes" change to "WITH_SRV: = no"

[zhangshexin]

Thank you very much, already can use, may be I used the virtual machine