mosquitto_client_id: symbol not found

[vibiu]

Here is my mosquitto.conf:

persistence true
persistence_location /mosquitto/data/
log_dest file /mosquitto/log/mosquitto.log
...
auth_plugin /mosquitto/src/mosquitto-auth-plug/auth-plug.so
auth_opt_backends postgres
...

When I run mosquitto -c /mosquitto/config/mosquitto.conf, I got:

mosquitto version 1.5.5 starting
1548693091: Config loaded from /mosquitto/config/mosquitto.conf.
1548693091: Error: Unable to load auth plugin "/mosquitto/src/mosquitto-auth-plug/auth-plug.so".
1548693091: Load error: Error relocating /mosquitto/src/mosquitto-auth-plug/auth-plug.so: mosquitto_client_id: symbol not found

Mosquitto version is 1.5.5, and mosquitto-auth-plug version is 0.1.3(which is the latest release).
I wonder to know what does mosquitto_client_id: symbol not found mean, and how can I solve this problem.
Thanks a lot.

[vibiu]

I can compile and run this plug well when I use mosquitto-auth-plug:0.1.2 and mosquitto:1.5.5.
I think there must be something wrong with mosquitto-auth-plug:0.1.3.
When I built them together in docker, thease error occurs:

cc  -I/src/ -I/lib/ -fPIC -Wall -Werror  -DBE_POSTGRES  -I`pg_config --includedir` -I/src -DDEBUG=1 -I/usr/include   -c -o auth-plug.o auth-plug.c
auth-plug.c:35:30: fatal error: mosquitto_broker.h: No such file or directory
compilation terminated.
<builtin>: recipe for target 'auth-plug.o' failed
make: *** [auth-plug.o] Error 1

I think this issue is familiar with #386.
You can check it out in here.
Thanks a lot.

[tobdub-snce]

I don't think auth-plug supports Mosquitto 1.5 yet. Try with Mosquitto 1.4.

[bogh]

I'm having the same issue. Managed to build the plugin with mosquitto 1.5.5 library and I get the following error: mosquitto_client_username: symbol not found.

We really need to use mosquitto 1.5 cause of the websockets. And as it looks the auth plugin needs the mosquitto_broker.h which is available from 1.5 I think.

Any idea why getting this problem?

Thank you.

[vytasmk]

Also playing with Docker and Alpine image (v3.8).
Compiling everything from source: Mosquitto 1.5.8 and mosquitto-auth-plug 0.1.3
Compiling with Redis and HTTP backends (all other are disabled). Got docker image size about 10MB

Everything compiles and Mosquitto runs without auth-plug normally. But when I try to enable auth-plug it thows error and can not start.

1551532223: mosquitto version 1.5.8 starting
1551532223: Config loaded from /etc/mosquitto/mosquitto.conf.
1551532223: Error: Unable to load auth plugin "/usr/local/lib/auth-plug.so".
1551532223: Load error: Error relocating /usr/local/lib/auth-plug.so: mosquitto_client_username: symbol not found

From inside container I run ldd against auth-plug.o

/ # ldd /usr/local/lib/auth-plug.so 
	ldd (0x7fa1d6a90000)
	libhiredis.so.0.14 => /usr/lib/libhiredis.so.0.14 (0x7fa1d6a6f000)
	libcurl.so.4 => /usr/lib/libcurl.so.4 (0x7fa1d69fb000)
	libcrypto.so.1.1 => /lib/libcrypto.so.1.1 (0x7fa1d677e000)
	libc.musl-x86_64.so.1 => ldd (0x7fa1d6a90000)
	libnghttp2.so.14 => /usr/lib/libnghttp2.so.14 (0x7fa1d675a000)
	libssh2.so.1 => /usr/lib/libssh2.so.1 (0x7fa1d6730000)
	libssl.so.1.1 => /lib/libssl.so.1.1 (0x7fa1d66b0000)
	libz.so.1 => /lib/libz.so.1 (0x7fa1d6696000)
Error relocating /usr/local/lib/auth-plug.so: mosquitto_client_id: symbol not found
Error relocating /usr/local/lib/auth-plug.so: mosquitto_client_certificate: symbol not found
Error relocating /usr/local/lib/auth-plug.so: mosquitto_client_username: symbol not found

Stuck here. Have tried digging and I think it could be related to the musl-libc that is used inside Alpine Linux instead of glibc... but this is just a guess. Functional differences musl-libc vs glibc

I tried to compile mosquitto v1.5.5 with auth-plug v0.1.3 - result the same.
When set auth-plug to v0.1.2 it just throws errors and does not compile:

auth-plug.c:102:5: error: conflicting types for 'mosquitto_auth_plugin_init'
 int mosquitto_auth_plugin_init(void **userdata, struct mosquitto_auth_opt *auth_opts, int auth_opt_count)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from auth-plug.c:35:0:
../mosq/src/mosquitto_plugin.h:118:5: note: previous declaration of 'mosquitto_auth_plugin_init' was here
 int mosquitto_auth_plugin_init(void **user_data, struct mosquitto_opt *opts, int opt_count);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~
...

[ghost]

Also tried to compile against 1.4.10 from Debian stretch and got following error:

CFLAGS:  -g -O2 -fdebug-prefix-map=/build/mosquitto-auth-plugin-0.1.3=. -fstack-protector-strong -Wformat -Werror=format-security  -I/src/ -I/lib/ -fPIC -Wall -Werror  -DBE_HTTP -DBE_JWT -DBE_FILES  -I/src -DDEBUG=1 -I/usr/include
LDFLAGS: -Wl,-z,relro -Wl,-z,now   -L/lib/
LDADD:    -lcurl -lcurl -L/usr/lib -lcrypto -lmosquitto

cc -g -O2 -fdebug-prefix-map=/build/mosquitto-auth-plugin-0.1.3=. -fstack-protector-strong -Wformat -Werror=format-security  -I/src/ -I/lib/ -fPIC -Wall -Werror  -DBE_HTTP -DBE_JWT -DBE_FILES  -I/src -DDEBUG=1 -I/usr/include -Wdate-time -D_FORTIFY_SOURCE=2  -c -o auth-plug.o ../auth-plug.c
../auth-plug.c:35:30: fatal error: mosquitto_broker.h: No such file or directory
 #include <mosquitto_broker.h>
                              ^
compilation terminated.
<builtin>: recipe for target 'auth-plug.o' failed
make[2]: *** [auth-plug.o] Error 1
make[2]: Leaving directory '/build/mosquitto-auth-plugin-0.1.3/build'
debian/rules:24: recipe for target 'override_dh_auto_build' failed
make[1]: *** [override_dh_auto_build] Error 2
make[1]: Leaving directory '/build/mosquitto-auth-plugin-0.1.3'
debian/rules:21: recipe for target 'build' failed
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
I: copying local configuration
E: Failed autobuilding of package
I: unmounting dev/ptmx filesystem
I: unmounting dev/pts filesystem
I: unmounting dev/shm filesystem
I: unmounting proc filesystem
I: unmounting sys filesystem
I: cleaning the build env