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Dynamic backend loading, based on patch from Luke Howard <lukeh@PADL.COM>

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@12411 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2003-06-29 12:10:00 +00:00
parent c12e22c5ee
commit 1efa899c5a
1 changed files with 98 additions and 2 deletions
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100
lib/hdb/hdb.c
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@@ -35,6 +35,10 @@
RCSID("$Id$");
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
struct hdb_method {
const char *prefix;
krb5_error_code (*create)(krb5_context, HDB **, const char *filename);
@@ -205,6 +209,94 @@ hdb_init_db(krb5_context context, HDB *db)
return ret;
}
#ifdef HAVE_DLOPEN
/*
* Load a dynamic backend from /usr/heimdal/lib/hdb_XXX.so,
* looking for the hdb_XXX_create symbol.
*/
static const struct hdb_method *
find_dynamic_method (krb5_context context,
const char *filename,
const char **rest)
{
static struct hdb_method method;
struct hdb_so_method *mso;
char *prefix, *path, *symbol;
const char *p;
void *dl;
size_t len;
dl = NULL;
p = strchr(filename, ':');
if (p != NULL) {
len = p - filename;
*rest = filename + len + 1;
} else {
len = strlen(filename);
*rest = "";
}
prefix = strndup(filename, len);
if (prefix == NULL)
krb5_errx(context, 1, "out of memory");
if (asprintf(&path, LIBDIR "/hdb_%s.so", prefix) == -1)
krb5_errx(context, 1, "out of memory");
dl = dlopen(path, RTLD_NOW | RTLD_GLOBAL);
if (dl == NULL) {
krb5_warnx(context, "error trying to load dynamic module %s: %s\n",
path, dlerror());
free(prefix);
free(path);
return NULL;
}
if (asprintf(&symbol, "hdb_%s_interface", prefix) == -1)
krb5_errx(context, 1, "out of memory");
mso = dlsym(dl, symbol);
if (mso == NULL) {
krb5_warnx(context, "error finding symbol %s in %s: %s\n",
symbol, path, dlerror());
dlclose(dl);
free(symbol);
free(prefix);
free(path);
return NULL;
}
free(path);
free(symbol);
if (mso->version != HDB_INTERFACE_VERSION) {
krb5_warnx(context,
"error wrong version in shared module %s "
"version: %d should have been %d\n",
prefix, mso->version, HDB_INTERFACE_VERSION);
dlclose(dl);
free(prefix);
return NULL;
}
if (mso->create == NULL) {
krb5_errx(context, 1,
"no entry point function in shared mod %s ",
prefix);
dlclose(dl);
free(prefix);
return NULL;
}
method.create = mso->create;
method.prefix = prefix;
return &method;
}
#endif /* HAVE_DLOPEN */
/*
* find the relevant method for `filename', returning a pointer to the
* rest in `rest'.
@@ -227,13 +319,17 @@ find_method (const char *filename, const char **rest)
krb5_error_code
hdb_create(krb5_context context, HDB **db, const char *filename)
{
const struct hdb_method *h;
const struct hdb_method *h = NULL;
const char *residual;
if(filename == NULL)
filename = HDB_DEFAULT_DB;
krb5_add_et_list(context, initialize_hdb_error_table_r);
h = find_method (filename, &residual);
#ifdef HAVE_DLOPEN
h = find_dynamic_method (context, filename, &residual);
#endif
if (h == NULL)
h = find_method (filename, &residual);
if (h == NULL)
krb5_errx(context, 1, "No database support! (hdb_create)");
return (*h->create)(context, db, residual);