doveadm: Add plugins support for doveadm pw

This simply tries to load all the auth plugins. The ones that aren't
password scheme plugins will most likely just fail. Hopefully this will
work fine so we don't need to require any specific naming rules for the
plugins.

Signed-off-by: Alin Dobre <alin@dovecot.fi>

src/doveadm/Makefile.am

@@ -21,6 +21,7 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/src/lib-storage \
 	-I$(top_srcdir)/src/auth \
 	-DMODULEDIR=\""$(moduledir)"\" \
+	-DAUTH_MODULE_DIR=\""$(moduledir)/auth"\" \
 	-DDOVEADM_MODULEDIR=\""$(doveadm_moduledir)"\" \
 	-DPKG_RUNDIR=\""$(rundir)"\" \
 	-DPKG_STATEDIR=\""$(statedir)"\" \

src/doveadm/doveadm-pw.c

@@ -6,6 +6,7 @@
 #include "randgen.h"
 #include "doveadm.h"
 #include "askpass.h"
+#include "module-dir.h"
 
 #include <ctype.h>
 #include <fcntl.h>
@@ -14,6 +15,8 @@
 
 #define DEFAULT_SCHEME "CRAM-MD5"
 
+static struct module *modules = NULL;
+
 static void cmd_pw(int argc, char *argv[])
 {
 	const char *hash = NULL;
@@ -24,10 +27,19 @@ static void cmd_pw(int argc, char *argv[])
 	bool list_schemes = FALSE, reverse_verify = FALSE;
 	unsigned int rounds = 0;
 	int c;
+	struct module_dir_load_settings mod_set;
 
 	random_init();
 	password_schemes_init();
-
+
+	memset(&mod_set, 0, sizeof(mod_set));
+	mod_set.abi_version = DOVECOT_ABI_VERSION;
+	mod_set.require_init_funcs = TRUE;
+	mod_set.ignore_dlopen_errors = TRUE;
+
+	modules = module_dir_load_missing(modules, AUTH_MODULE_DIR, NULL, &mod_set);
+	module_dir_init(modules);
+
 	while ((c = getopt(argc, argv, "lp:r:s:t:u:V")) > 0) {
 		switch (c) {
 		case 'l':
@@ -122,6 +134,7 @@ static void cmd_pw(int argc, char *argv[])
 		printf("{%s}%s\n", scheme, hash);
 	}
 
+	module_dir_unload(&modules);
 	password_schemes_deinit();
 	random_deinit();
 }