411 lines
8.5 KiB
C
411 lines
8.5 KiB
C
/*
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* Copyright (C) 2012 Martin Willi
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* Copyright (C) 2012 revosec AG
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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 "lookip_socket.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <errno.h>
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#include <daemon.h>
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#include <threading/thread.h>
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#include <threading/mutex.h>
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#include <collections/linked_list.h>
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#include <processing/jobs/callback_job.h>
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#include "lookip_msg.h"
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typedef struct private_lookip_socket_t private_lookip_socket_t;
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/**
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* Private data of an lookip_socket_t object.
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*/
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struct private_lookip_socket_t {
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/**
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* Public lookip_socket_t interface.
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*/
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lookip_socket_t public;
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/**
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* lookip
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*/
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lookip_listener_t *listener;
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/**
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* stream service accepting connections
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*/
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stream_service_t *service;
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/**
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* List of connected clients, as entry_t
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*/
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linked_list_t *connected;
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/**
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* Mutex to lock clients list
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*/
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mutex_t *mutex;
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};
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/**
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* List entry for a connected stream
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*/
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typedef struct {
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/* stream to write to */
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stream_t *stream;
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/* registered for up events? */
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bool up;
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/* registered for down events? */
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bool down;
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/** backref to this for unregistration */
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private_lookip_socket_t *this;
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} entry_t;
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/**
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* Clean up a connection entry
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*/
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static void entry_destroy(entry_t *entry)
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{
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entry->stream->destroy(entry->stream);
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free(entry);
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}
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/**
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* Disconnect a stream, remove connection entry
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*/
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static void disconnect(private_lookip_socket_t *this, stream_t *stream)
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{
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enumerator_t *enumerator;
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entry_t *entry;
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this->mutex->lock(this->mutex);
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enumerator = this->connected->create_enumerator(this->connected);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->stream == stream)
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{
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this->connected->remove_at(this->connected, enumerator);
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if (entry->up || entry->down)
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{
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this->listener->remove_listener(this->listener, entry);
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}
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entry_destroy(entry);
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->mutex->unlock(this->mutex);
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}
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/**
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* Callback function for listener up/down events
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*/
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static bool event_cb(entry_t *entry, bool up, host_t *vip, host_t *other,
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identification_t *id, char *name, u_int unique_id)
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{
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lookip_response_t resp = {
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.unique_id = htonl(unique_id),
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};
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if (up)
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{
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if (!entry->up)
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{
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return TRUE;
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}
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resp.type = htonl(LOOKIP_NOTIFY_UP);
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}
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else
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{
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if (!entry->down)
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{
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return TRUE;
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}
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resp.type = htonl(LOOKIP_NOTIFY_DOWN);
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}
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snprintf(resp.vip, sizeof(resp.vip), "%H", vip);
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snprintf(resp.ip, sizeof(resp.ip), "%H", other);
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snprintf(resp.id, sizeof(resp.id), "%Y", id);
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snprintf(resp.name, sizeof(resp.name), "%s", name);
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if (entry->stream->write_all(entry->stream, &resp, sizeof(resp)))
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{
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return TRUE;
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}
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switch (errno)
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{
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case ECONNRESET:
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case EPIPE:
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/* client disconnected, adios */
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break;
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default:
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DBG1(DBG_CFG, "sending lookip event failed: %s", strerror(errno));
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break;
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}
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/* don't unregister, as we return FALSE */
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entry->up = entry->down = FALSE;
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disconnect(entry->this, entry->stream);
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return FALSE;
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}
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/**
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* Callback function for queries
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*/
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static bool query_cb(stream_t *stream, bool up, host_t *vip, host_t *other,
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identification_t *id, char *name, u_int unique_id)
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{
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lookip_response_t resp = {
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.type = htonl(LOOKIP_ENTRY),
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.unique_id = htonl(unique_id),
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};
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snprintf(resp.vip, sizeof(resp.vip), "%H", vip);
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snprintf(resp.ip, sizeof(resp.ip), "%H", other);
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snprintf(resp.id, sizeof(resp.id), "%Y", id);
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snprintf(resp.name, sizeof(resp.name), "%s", name);
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if (stream->write_all(stream, &resp, sizeof(resp)))
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{
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return TRUE;
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}
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switch (errno)
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{
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case ECONNRESET:
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case EPIPE:
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/* client disconnected, adios */
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break;
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default:
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DBG1(DBG_CFG, "sending lookip response failed: %s", strerror(errno));
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break;
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}
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return FALSE;
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}
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/**
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* Perform a lookup
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*/
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static void query(private_lookip_socket_t *this, stream_t *stream,
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lookip_request_t *req)
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{
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host_t *vip = NULL;
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int matches = 0;
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if (req)
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{ /* lookup */
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req->vip[sizeof(req->vip) - 1] = 0;
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vip = host_create_from_string(req->vip, 0);
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if (vip)
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{
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matches = this->listener->lookup(this->listener, vip,
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(void*)query_cb, stream);
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vip->destroy(vip);
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}
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if (matches == 0)
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{
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lookip_response_t resp = {
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.type = htonl(LOOKIP_NOT_FOUND),
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};
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snprintf(resp.vip, sizeof(resp.vip), "%s", req->vip);
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if (!stream->write_all(stream, &resp, sizeof(resp)))
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{
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DBG1(DBG_CFG, "sending lookip not-found failed: %s",
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strerror(errno));
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}
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}
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}
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else
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{ /* dump */
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this->listener->lookup(this->listener, NULL,
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(void*)query_cb, stream);
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}
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}
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/**
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* Subscribe to virtual IP events
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*/
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static void subscribe(private_lookip_socket_t *this, stream_t *stream, bool up)
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{
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enumerator_t *enumerator;
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entry_t *entry;
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this->mutex->lock(this->mutex);
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enumerator = this->connected->create_enumerator(this->connected);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->stream == stream)
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{
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if (!entry->up && !entry->down)
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{ /* newly registered */
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this->listener->add_listener(this->listener,
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(void*)event_cb, entry);
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}
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if (up)
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{
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entry->up = TRUE;
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}
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else
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{
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entry->down = TRUE;
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}
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}
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}
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enumerator->destroy(enumerator);
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this->mutex->unlock(this->mutex);
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}
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/**
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* Check if a client is subscribed for notifications
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*/
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static bool subscribed(private_lookip_socket_t *this, stream_t *stream)
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{
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enumerator_t *enumerator;
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bool subscribed = FALSE;
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entry_t *entry;
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this->mutex->lock(this->mutex);
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enumerator = this->connected->create_enumerator(this->connected);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->stream == stream)
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{
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subscribed = entry->up || entry->down;
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->mutex->unlock(this->mutex);
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return subscribed;
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}
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/**
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* Dispatch from a socket, on-read callback
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*/
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static bool on_read(private_lookip_socket_t *this, stream_t *stream)
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{
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lookip_request_t req;
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if (stream->read_all(stream, &req, sizeof(req)))
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{
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switch (ntohl(req.type))
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{
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case LOOKIP_LOOKUP:
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query(this, stream, &req);
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return TRUE;
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case LOOKIP_DUMP:
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query(this, stream, NULL);
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return TRUE;
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case LOOKIP_REGISTER_UP:
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subscribe(this, stream, TRUE);
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return TRUE;
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case LOOKIP_REGISTER_DOWN:
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subscribe(this, stream, FALSE);
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return TRUE;
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case LOOKIP_END:
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break;
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default:
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DBG1(DBG_CFG, "received unknown lookip command");
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break;
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}
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}
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else
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{
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if (errno != ECONNRESET)
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{
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DBG1(DBG_CFG, "receiving lookip request failed: %s",
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strerror(errno));
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}
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disconnect(this, stream);
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return FALSE;
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}
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if (subscribed(this, stream))
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{
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return TRUE;
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}
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disconnect(this, stream);
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return FALSE;
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}
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/**
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* Accept client connections, dispatch
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*/
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static bool on_accept(private_lookip_socket_t *this, stream_t *stream)
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{
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entry_t *entry;
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INIT(entry,
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.stream = stream,
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.this = this,
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);
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this->mutex->lock(this->mutex);
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this->connected->insert_last(this->connected, entry);
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this->mutex->unlock(this->mutex);
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stream->on_read(stream, (void*)on_read, this);
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return TRUE;
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}
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METHOD(lookip_socket_t, destroy, void,
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private_lookip_socket_t *this)
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{
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DESTROY_IF(this->service);
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this->connected->destroy_function(this->connected, (void*)entry_destroy);
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this->mutex->destroy(this->mutex);
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free(this);
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}
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/**
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* See header
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*/
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lookip_socket_t *lookip_socket_create(lookip_listener_t *listener)
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{
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private_lookip_socket_t *this;
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char *uri;
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INIT(this,
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.public = {
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.destroy = _destroy,
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},
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.listener = listener,
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.connected = linked_list_create(),
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.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
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);
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uri = lib->settings->get_str(lib->settings,
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"%s.plugins.lookip.socket", "unix://" LOOKIP_SOCKET,
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lib->ns);
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this->service = lib->streams->create_service(lib->streams, uri, 10);
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if (!this->service)
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{
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DBG1(DBG_CFG, "creating lookip socket failed");
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destroy(this);
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return NULL;
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}
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this->service->on_accept(this->service, (stream_service_cb_t)on_accept,
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this, JOB_PRIO_CRITICAL, 1);
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return &this->public;
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}
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