restructuring of configuration backends
added propotypes of new control interfaces (xml & dbus) introduced loadable: configuration backends control interfaces using pluggable modules as in EAP
This commit is contained in:
Martin Willi
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/**
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* @file interface_manager.c
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*
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* @brief Implementation of interface_manager_t.
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*
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*/
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/*
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* Copyright (C) 2007 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "interface_manager.h"
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#include <sys/types.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <dlfcn.h>
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#include <daemon.h>
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#include <library.h>
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#include <control/interfaces/interface.h>
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#include <processing/job_queue.h>
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#include <processing/jobs/initiate_job.h>
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typedef struct private_interface_manager_t private_interface_manager_t;
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/**
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* Private data of an stroke_t object.
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*/
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struct private_interface_manager_t {
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/**
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* Public part of stroke_t object.
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*/
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interface_manager_t public;
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/**
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* a list of all loaded interfaces
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*/
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linked_list_t *interfaces;
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/**
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* dlopen() handles of interfaces
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*/
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linked_list_t *handles;
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};
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/**
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* Implementation of interface_manager_t.initiate.
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*/
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static status_t initiate(private_interface_manager_t *this,
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peer_cfg_t *peer_cfg, child_cfg_t *child_cfg,
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bool(*cb)(void*,signal_t,level_t,ike_sa_t*,char*,va_list),
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void *param)
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{
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ike_sa_t *ours = NULL;
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job_t *job;
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status_t retval;
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charon->bus->set_listen_state(charon->bus, TRUE);
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job = (job_t*)initiate_job_create(peer_cfg, child_cfg);
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charon->job_queue->add(charon->job_queue, job);
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while (TRUE)
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{
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level_t level;
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signal_t signal;
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int thread;
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ike_sa_t *ike_sa;
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char* format;
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va_list args;
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signal = charon->bus->listen(charon->bus, &level, &thread,
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&ike_sa, &format, &args);
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if (cb && (ike_sa == ours || ours == NULL))
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{
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if (!cb(param, signal, level, ike_sa, format, args))
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{
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charon->bus->set_listen_state(charon->bus, FALSE);
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return NEED_MORE;
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}
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}
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switch (signal)
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{
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case CHILD_UP_SUCCESS:
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if (ike_sa == ours)
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{
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retval = SUCCESS;
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break;
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}
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continue;
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case CHILD_UP_FAILED:
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case IKE_UP_FAILED:
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if (ike_sa == ours)
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{
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retval = FAILED;
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break;
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}
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continue;
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case CHILD_UP_START:
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case IKE_UP_START:
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if (ours == NULL)
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{
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ours = ike_sa;
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}
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continue;
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default:
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continue;
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}
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break;
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}
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charon->bus->set_listen_state(charon->bus, FALSE);
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return retval;
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}
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/**
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* load the control interface modules
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*/
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static void load_interfaces(private_interface_manager_t *this)
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{
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struct dirent* entry;
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struct stat stb;
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DIR* dir;
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if (stat(IPSEC_INTERFACEDIR, &stb) == -1 || !(stb.st_mode & S_IFDIR))
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{
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DBG1(DBG_CFG, "error opening interface modules directory "IPSEC_INTERFACEDIR);
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return;
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}
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dir = opendir(IPSEC_INTERFACEDIR);
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if (dir == NULL)
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{
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DBG1(DBG_CFG, "error opening interface modules directory "IPSEC_INTERFACEDIR);
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return;
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}
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DBG1(DBG_CFG, "loading control interface modules from '"IPSEC_INTERFACEDIR"'");
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while ((entry = readdir(dir)) != NULL)
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{
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char file[256];
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interface_t *interface;
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interface_constructor_t constructor;
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void *handle;
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char *ending;
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snprintf(file, sizeof(file), IPSEC_INTERFACEDIR"/%s", entry->d_name);
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if (stat(file, &stb) == -1 || !(stb.st_mode & S_IFREG))
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{
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DBG2(DBG_CFG, " skipping %s, doesn't look like a file",
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entry->d_name);
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continue;
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}
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ending = entry->d_name + strlen(entry->d_name) - 3;
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if (ending <= entry->d_name || !streq(ending, ".so"))
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{
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/* skip anything which does not look like a library */
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DBG2(DBG_CFG, " skipping %s, doesn't look like a library",
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entry->d_name);
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continue;
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}
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/* try to load the library */
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handle = dlopen(file, RTLD_LAZY);
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if (handle == NULL)
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{
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DBG1(DBG_CFG, " opening control interface module %s failed: %s",
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entry->d_name, dlerror());
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continue;
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}
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constructor = dlsym(handle, "interface_create");
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if (constructor == NULL)
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{
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DBG1(DBG_CFG, " interface module %s has no interface_create() "
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"function, skipped", entry->d_name);
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dlclose(handle);
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continue;
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}
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interface = constructor();
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if (interface == NULL)
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{
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DBG1(DBG_CFG, " unable to create instance of interface "
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"module %s, skipped", entry->d_name);
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dlclose(handle);
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continue;
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}
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DBG1(DBG_CFG, " loaded control interface module successfully from %s", entry->d_name);
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this->interfaces->insert_last(this->interfaces, interface);
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this->handles->insert_last(this->handles, handle);
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}
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closedir(dir);
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}
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/**
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* Implementation of stroke_t.destroy.
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*/
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static void destroy(private_interface_manager_t *this)
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{
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this->interfaces->destroy_offset(this->interfaces, offsetof(interface_t, destroy));
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this->handles->destroy_function(this->handles, (void*)dlclose);
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free(this);
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}
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/*
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* Described in header-file
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*/
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interface_manager_t *interface_manager_create(void)
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{
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private_interface_manager_t *this = malloc_thing(private_interface_manager_t);
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this->public.initiate = (status_t(*)(interface_manager_t*,peer_cfg_t*,child_cfg_t*,bool(*)(void*,signal_t,level_t,ike_sa_t*,char*,va_list),void*))initiate;
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this->public.destroy = (void (*)(interface_manager_t*))destroy;
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this->interfaces = linked_list_create();
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this->handles = linked_list_create();
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load_interfaces(this);
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return &this->public;
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}
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