make mosquitto-auth-plug on windows

问题

I am currently trying to build the mosquitto-auth-plugin on windows but I am unsure which make process to use. The doc says to edit the config.mk file which I have done, then to 'make' the auth-plug -- this is were I am struck I have tried to make using GnWin & MinGW but neither has worked is there a way to build-make the library on windows or can I make it in Linux and copy the auth-plug.o to my windows machine?

回答1:

I'm not aware of anybody having attempted to build mosquitto-auth-plug on Windows, and I'd be very surprised if that worked at all; as the author of the plugin, I paid no attention to portability outside Un*x, and so as to not raise hopes, I will not. :-)

That said, you cannot run (load) shared objects built on Linux on Windows. What may be possible, but it's been years since I did anything similar, is to cross compile with an appropriate toolchain.

回答2:

I build it for Windows, using the HTTP and JWT backends only.

Had to fix:

Put __declspec(dllexport) to the mosquitto_auth_Xyz... functions in auth-plug.c.
Added alternative code for fnmatch(a,b) and strsep() in auth-plug.c, see below.
In log.c I fell back to use log=__log instead of log=mosquitto_log_printf as I failed importing the function from libmosquitto.
Compiled using Visual Studio 2017 Express with preprocessor definitions _CRT_NONSTDC_NO_DEPRECATE and _CRT_SECURE_NO_WARNINGS put into place.

The code works fine!

For fnmatch(a,b) and strsep() in auth-plug.c change the #include to:

#ifdef _WIN32
#include <windows.h>
#include <shlwapi.h>
#define fnmatch(a, b, c) PathMatchSpecA(a, b)
extern char* strsep(char** stringp, const char* delim)
{
    char* start = *stringp;
    char* p;

    p = (start != NULL) ? strpbrk(start, delim) : NULL;

    if (p == NULL)
    {
        *stringp = NULL;
    }
    else
    {
        *p = '\0';
        *stringp = p + 1;
    }

    return start;
}
#else
#include <fnmatch.h>
#endif

来源：https://stackoverflow.com/questions/31808612/make-mosquitto-auth-plug-on-windows

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