diff options
Diffstat (limited to 'source4/heimdal/lib/krb5/plugin.c')
| -rw-r--r-- | source4/heimdal/lib/krb5/plugin.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/plugin.c b/source4/heimdal/lib/krb5/plugin.c new file mode 100644 index 0000000000..294807faab --- /dev/null +++ b/source4/heimdal/lib/krb5/plugin.c @@ -0,0 +1,242 @@ +/* + * Copyright (c) 2006 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "krb5_locl.h" +RCSID("$Id: plugin.c,v 1.2 2006/11/12 21:39:43 lha Exp $"); +#ifdef HAVE_DLFCN_H +#include <dlfcn.h> +#endif +#include <dirent.h> + +struct krb5_plugin { + void *symbol; + void *dsohandle; + struct krb5_plugin *next; +}; + +struct plugin { + enum plugin_type type; + void *name; + void *symbol; + struct plugin *next; +}; + +static HEIMDAL_MUTEX plugin_mutex = HEIMDAL_MUTEX_INITIALIZER; +static struct plugin *registered = NULL; + +static const char *plugin_dir = LIBDIR "/plugin/krb5"; + +/* + * + */ + +void * +_krb5_plugin_get_symbol(struct krb5_plugin *p) +{ + return p->symbol; +} + +struct krb5_plugin * +_krb5_plugin_get_next(struct krb5_plugin *p) +{ + return p->next; +} + +/* + * + */ + +static krb5_error_code +loadlib(krb5_context context, + enum plugin_type type, + const char *name, + const char *lib, + struct krb5_plugin **e) +{ + *e = calloc(1, sizeof(**e)); + if (*e == NULL) { + krb5_set_error_string(context, "out of memory"); + return ENOMEM; + } + + (*e)->dsohandle = dlopen(lib, 0); + if ((*e)->dsohandle == NULL) { + free(*e); + krb5_set_error_string(context, "Failed to load %s: %s", + lib, dlerror()); + return ENOMEM; + } + + /* dlsym doesn't care about the type */ + (*e)->symbol = dlsym((*e)->dsohandle, name); + if ((*e)->symbol == NULL) { + dlclose((*e)->dsohandle); + free(*e); + krb5_clear_error_string(context); + return ENOMEM; + } + + return 0; +} + +krb5_error_code +_krb5_plugin_register(krb5_context context, + enum plugin_type type, + const char *name, + void *symbol) +{ + struct plugin *e; + + e = calloc(1, sizeof(*e)); + if (e == NULL) { + krb5_set_error_string(context, "out of memory"); + return ENOMEM; + } + e->type = type; + e->name = strdup(name); + if (e->name == NULL) { + free(e); + krb5_set_error_string(context, "out of memory"); + return ENOMEM; + } + e->symbol = symbol; + + HEIMDAL_MUTEX_lock(&plugin_mutex); + e->next = registered; + registered = e; + HEIMDAL_MUTEX_unlock(&plugin_mutex); + + return 0; +} + +krb5_error_code +_krb5_plugin_find(krb5_context context, + enum plugin_type type, + const char *name, + struct krb5_plugin **list) +{ + struct krb5_plugin *e; + struct plugin *p; + krb5_error_code ret; + char *sysdirs[2] = { NULL, NULL }; + char **dirs = NULL, **di; + struct dirent *entry; + char *path; + DIR *d = NULL; + + *list = NULL; + + HEIMDAL_MUTEX_lock(&plugin_mutex); + + for (p = registered; p != NULL; p = p->next) { + if (p->type != type || strcmp(p->name, name) != 0) + continue; + + e = calloc(1, sizeof(*e)); + if (e == NULL) { + HEIMDAL_MUTEX_unlock(&plugin_mutex); + krb5_set_error_string(context, "out of memory"); + ret = ENOMEM; + goto out; + } + e->symbol = p->symbol; + e->dsohandle = NULL; + e->next = *list; + *list = e; + } + HEIMDAL_MUTEX_unlock(&plugin_mutex); + + dirs = krb5_config_get_strings(context, NULL, "libdefaults", + "plugin_dir", NULL); + if (dirs == NULL) { + sysdirs[0] = rk_UNCONST(plugin_dir); + dirs = sysdirs; + } + + for (di = dirs; *di != NULL; di++) { + + d = opendir(*di); + if (d == NULL) + continue; + + while ((entry = readdir(d)) != NULL) { + asprintf(&path, "%s/%s", *di, entry->d_name); + if (path == NULL) { + krb5_set_error_string(context, "out of memory"); + ret = ENOMEM; + goto out; + } + ret = loadlib(context, type, name, path, &e); + free(path); + if (ret) + continue; + + e->next = *list; + *list = e; + } + closedir(d); + } + if (dirs != sysdirs) + krb5_config_free_strings(dirs); + + if (*list == NULL) { + krb5_set_error_string(context, "Did not find a plugin for %s", name); + return ENOENT; + } + + return 0; + +out: + if (dirs && dirs != sysdirs) + krb5_config_free_strings(dirs); + if (d) + closedir(d); + _krb5_plugin_free(*list); + *list = NULL; + + return ret; +} + +void +_krb5_plugin_free(struct krb5_plugin *list) +{ + struct krb5_plugin *next; + while (list) { + next = list->next; + if (list->dsohandle) + dlclose(list->dsohandle); + free(list); + list = next; + } +} + |