summaryrefslogtreecommitdiff
path: root/src/libcharon/bus/bus.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libcharon/bus/bus.c')
-rw-r--r--src/libcharon/bus/bus.c727
1 files changed, 727 insertions, 0 deletions
diff --git a/src/libcharon/bus/bus.c b/src/libcharon/bus/bus.c
new file mode 100644
index 000000000..764744a41
--- /dev/null
+++ b/src/libcharon/bus/bus.c
@@ -0,0 +1,727 @@
+/*
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "bus.h"
+
+#include <stdint.h>
+
+#include <daemon.h>
+#include <threading/thread.h>
+#include <threading/thread_value.h>
+#include <threading/condvar.h>
+#include <threading/mutex.h>
+
+typedef struct private_bus_t private_bus_t;
+
+/**
+ * Private data of a bus_t object.
+ */
+struct private_bus_t {
+ /**
+ * Public part of a bus_t object.
+ */
+ bus_t public;
+
+ /**
+ * List of registered listeners as entry_t's
+ */
+ linked_list_t *listeners;
+
+ /**
+ * mutex to synchronize active listeners, recursively
+ */
+ mutex_t *mutex;
+
+ /**
+ * Thread local storage the threads IKE_SA
+ */
+ thread_value_t *thread_sa;
+};
+
+typedef struct entry_t entry_t;
+
+/**
+ * a listener entry, either active or passive
+ */
+struct entry_t {
+
+ /**
+ * registered listener interface
+ */
+ listener_t *listener;
+
+ /**
+ * is this a active listen() call with a blocking thread
+ */
+ bool blocker;
+
+ /**
+ * are we currently calling this listener
+ */
+ int calling;
+
+ /**
+ * condvar where active listeners wait
+ */
+ condvar_t *condvar;
+};
+
+/**
+ * create a listener entry
+ */
+static entry_t *entry_create(listener_t *listener, bool blocker)
+{
+ entry_t *this = malloc_thing(entry_t);
+
+ this->listener = listener;
+ this->blocker = blocker;
+ this->calling = 0;
+ this->condvar = condvar_create(CONDVAR_TYPE_DEFAULT);
+
+ return this;
+}
+
+/**
+ * destroy an entry_t
+ */
+static void entry_destroy(entry_t *entry)
+{
+ entry->condvar->destroy(entry->condvar);
+ free(entry);
+}
+
+/**
+ * Implementation of bus_t.add_listener.
+ */
+static void add_listener(private_bus_t *this, listener_t *listener)
+{
+ this->mutex->lock(this->mutex);
+ this->listeners->insert_last(this->listeners, entry_create(listener, FALSE));
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.remove_listener.
+ */
+static void remove_listener(private_bus_t *this, listener_t *listener)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->listener == listener)
+ {
+ this->listeners->remove_at(this->listeners, enumerator);
+ entry_destroy(entry);
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+typedef struct cleanup_data_t cleanup_data_t;
+
+/**
+ * data to remove a listener using thread_cleanup_t handler
+ */
+struct cleanup_data_t {
+ /** bus instance */
+ private_bus_t *this;
+ /** listener entry */
+ entry_t *entry;
+};
+
+/**
+ * thread_cleanup_t handler to remove a listener
+ */
+static void listener_cleanup(cleanup_data_t *data)
+{
+ data->this->listeners->remove(data->this->listeners, data->entry, NULL);
+ entry_destroy(data->entry);
+}
+
+/**
+ * Implementation of bus_t.listen.
+ */
+static void listen_(private_bus_t *this, listener_t *listener, job_t *job)
+{
+ bool old;
+ cleanup_data_t data;
+
+ data.this = this;
+ data.entry = entry_create(listener, TRUE);
+
+ this->mutex->lock(this->mutex);
+ this->listeners->insert_last(this->listeners, data.entry);
+ charon->processor->queue_job(charon->processor, job);
+ thread_cleanup_push((thread_cleanup_t)this->mutex->unlock, this->mutex);
+ thread_cleanup_push((thread_cleanup_t)listener_cleanup, &data);
+ old = thread_cancelability(TRUE);
+ while (data.entry->blocker)
+ {
+ data.entry->condvar->wait(data.entry->condvar, this->mutex);
+ }
+ thread_cancelability(old);
+ thread_cleanup_pop(FALSE);
+ /* unlock mutex */
+ thread_cleanup_pop(TRUE);
+ entry_destroy(data.entry);
+}
+
+/**
+ * Implementation of bus_t.set_sa.
+ */
+static void set_sa(private_bus_t *this, ike_sa_t *ike_sa)
+{
+ this->thread_sa->set(this->thread_sa, ike_sa);
+}
+
+/**
+ * Implementation of bus_t.get_sa
+ */
+static ike_sa_t* get_sa(private_bus_t *this)
+{
+ return this->thread_sa->get(this->thread_sa);
+}
+
+/**
+ * data associated to a signal, passed to callback
+ */
+typedef struct {
+ /** associated IKE_SA */
+ ike_sa_t *ike_sa;
+ /** invoking thread */
+ long thread;
+ /** debug group */
+ debug_t group;
+ /** debug level */
+ level_t level;
+ /** format string */
+ char *format;
+ /** argument list */
+ va_list args;
+} log_data_t;
+
+/**
+ * listener->log() invocation as a list remove callback
+ */
+static bool log_cb(entry_t *entry, log_data_t *data)
+{
+ va_list args;
+
+ if (entry->calling || !entry->listener->log)
+ { /* avoid recursive calls */
+ return FALSE;
+ }
+ entry->calling++;
+ va_copy(args, data->args);
+ if (!entry->listener->log(entry->listener, data->group, data->level,
+ data->thread, data->ike_sa, data->format, args))
+ {
+ if (entry->blocker)
+ {
+ entry->blocker = FALSE;
+ entry->condvar->signal(entry->condvar);
+ }
+ else
+ {
+ entry_destroy(entry);
+ }
+ va_end(args);
+ entry->calling--;
+ return TRUE;
+ }
+ va_end(args);
+ entry->calling--;
+ return FALSE;
+}
+
+/**
+ * Implementation of bus_t.vlog.
+ */
+static void vlog(private_bus_t *this, debug_t group, level_t level,
+ char* format, va_list args)
+{
+ log_data_t data;
+
+ data.ike_sa = this->thread_sa->get(this->thread_sa);
+ data.thread = thread_current_id();
+ data.group = group;
+ data.level = level;
+ data.format = format;
+ va_copy(data.args, args);
+
+ this->mutex->lock(this->mutex);
+ /* We use the remove() method to invoke all listeners. This is cheap and
+ * does not require an allocation for this performance critical function. */
+ this->listeners->remove(this->listeners, &data, (void*)log_cb);
+ this->mutex->unlock(this->mutex);
+
+ va_end(data.args);
+}
+
+/**
+ * Implementation of bus_t.log.
+ */
+static void log_(private_bus_t *this, debug_t group, level_t level,
+ char* format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ vlog(this, group, level, format, args);
+ va_end(args);
+}
+
+/**
+ * unregister a listener
+ */
+static void unregister_listener(private_bus_t *this, entry_t *entry,
+ enumerator_t *enumerator)
+{
+ if (entry->blocker)
+ {
+ entry->blocker = FALSE;
+ entry->condvar->signal(entry->condvar);
+ }
+ else
+ {
+ entry_destroy(entry);
+ }
+ this->listeners->remove_at(this->listeners, enumerator);
+}
+
+/**
+ * Implementation of bus_t.alert
+ */
+static void alert(private_bus_t *this, alert_t alert, ...)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ va_list args;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->alert)
+ {
+ continue;
+ }
+ entry->calling++;
+ va_start(args, alert);
+ keep = entry->listener->alert(entry->listener, ike_sa, alert, args);
+ va_end(args);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.ike_state_change
+ */
+static void ike_state_change(private_bus_t *this, ike_sa_t *ike_sa,
+ ike_sa_state_t state)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_state_change)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_state_change(entry->listener, ike_sa, state);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_state_change
+ */
+static void child_state_change(private_bus_t *this, child_sa_t *child_sa,
+ child_sa_state_t state)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_state_change)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_state_change(entry->listener, ike_sa,
+ child_sa, state);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.message
+ */
+static void message(private_bus_t *this, message_t *message, bool incoming)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->message)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->message(entry->listener, ike_sa,
+ message, incoming);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.ike_keys
+ */
+static void ike_keys(private_bus_t *this, ike_sa_t *ike_sa,
+ diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r,
+ ike_sa_t *rekey)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_keys)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_keys(entry->listener, ike_sa, dh,
+ nonce_i, nonce_r, rekey);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_keys
+ */
+static void child_keys(private_bus_t *this, child_sa_t *child_sa,
+ diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_keys)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_keys(entry->listener, ike_sa, child_sa,
+ dh, nonce_i, nonce_r);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_updown
+ */
+static void child_updown(private_bus_t *this, child_sa_t *child_sa, bool up)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_updown)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_updown(entry->listener,
+ ike_sa, child_sa, up);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.child_rekey
+ */
+static void child_rekey(private_bus_t *this, child_sa_t *old, child_sa_t *new)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->child_rekey)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->child_rekey(entry->listener, ike_sa, old, new);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.ike_updown
+ */
+static void ike_updown(private_bus_t *this, ike_sa_t *ike_sa, bool up)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_updown)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_updown(entry->listener, ike_sa, up);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+
+ /* a down event for IKE_SA implicitly downs all CHILD_SAs */
+ if (!up)
+ {
+ iterator_t *iterator;
+ child_sa_t *child_sa;
+
+ iterator = ike_sa->create_child_sa_iterator(ike_sa);
+ while (iterator->iterate(iterator, (void**)&child_sa))
+ {
+ child_updown(this, child_sa, FALSE);
+ }
+ iterator->destroy(iterator);
+ }
+}
+
+/**
+ * Implementation of bus_t.ike_rekey
+ */
+static void ike_rekey(private_bus_t *this, ike_sa_t *old, ike_sa_t *new)
+{
+ enumerator_t *enumerator;
+ entry_t *entry;
+ bool keep;
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->ike_rekey)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->ike_rekey(entry->listener, old, new);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of bus_t.authorize
+ */
+static bool authorize(private_bus_t *this, bool final)
+{
+ enumerator_t *enumerator;
+ ike_sa_t *ike_sa;
+ entry_t *entry;
+ bool keep, success = TRUE;
+
+ ike_sa = this->thread_sa->get(this->thread_sa);
+
+ this->mutex->lock(this->mutex);
+ enumerator = this->listeners->create_enumerator(this->listeners);
+ while (enumerator->enumerate(enumerator, &entry))
+ {
+ if (entry->calling || !entry->listener->authorize)
+ {
+ continue;
+ }
+ entry->calling++;
+ keep = entry->listener->authorize(entry->listener, ike_sa,
+ final, &success);
+ entry->calling--;
+ if (!keep)
+ {
+ unregister_listener(this, entry, enumerator);
+ }
+ if (!success)
+ {
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+ this->mutex->unlock(this->mutex);
+ return success;
+}
+
+/**
+ * Implementation of bus_t.destroy.
+ */
+static void destroy(private_bus_t *this)
+{
+ this->thread_sa->destroy(this->thread_sa);
+ this->mutex->destroy(this->mutex);
+ this->listeners->destroy_function(this->listeners, (void*)entry_destroy);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+bus_t *bus_create()
+{
+ private_bus_t *this = malloc_thing(private_bus_t);
+
+ this->public.add_listener = (void(*)(bus_t*,listener_t*))add_listener;
+ this->public.remove_listener = (void(*)(bus_t*,listener_t*))remove_listener;
+ this->public.listen = (void(*)(bus_t*, listener_t *listener, job_t *job))listen_;
+ this->public.set_sa = (void(*)(bus_t*,ike_sa_t*))set_sa;
+ this->public.get_sa = (ike_sa_t*(*)(bus_t*))get_sa;
+ this->public.log = (void(*)(bus_t*,debug_t,level_t,char*,...))log_;
+ this->public.vlog = (void(*)(bus_t*,debug_t,level_t,char*,va_list))vlog;
+ this->public.alert = (void(*)(bus_t*, alert_t alert, ...))alert;
+ this->public.ike_state_change = (void(*)(bus_t*,ike_sa_t*,ike_sa_state_t))ike_state_change;
+ this->public.child_state_change = (void(*)(bus_t*,child_sa_t*,child_sa_state_t))child_state_change;
+ this->public.message = (void(*)(bus_t*, message_t *message, bool incoming))message;
+ this->public.ike_keys = (void(*)(bus_t*, ike_sa_t *ike_sa, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r, ike_sa_t *rekey))ike_keys;
+ this->public.child_keys = (void(*)(bus_t*, child_sa_t *child_sa, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r))child_keys;
+ this->public.ike_updown = (void(*)(bus_t*, ike_sa_t *ike_sa, bool up))ike_updown;
+ this->public.ike_rekey = (void(*)(bus_t*, ike_sa_t *old, ike_sa_t *new))ike_rekey;
+ this->public.child_updown = (void(*)(bus_t*, child_sa_t *child_sa, bool up))child_updown;
+ this->public.child_rekey = (void(*)(bus_t*, child_sa_t *old, child_sa_t *new))child_rekey;
+ this->public.authorize = (bool(*)(bus_t*, bool final))authorize;
+ this->public.destroy = (void(*)(bus_t*)) destroy;
+
+ this->listeners = linked_list_create();
+ this->mutex = mutex_create(MUTEX_TYPE_RECURSIVE);
+ this->thread_sa = thread_value_create(NULL);
+
+ return &this->public;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 16:59:09 +0000