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1.1 misho 1: /*
2: * Copyright (C) 2012 Tobias Brunner
3: * Copyright (C) 2005-2006 Martin Willi
4: * Copyright (C) 2005 Jan Hutter
5: * HSR Hochschule fuer Technik Rapperswil
6: *
7: * This program is free software; you can redistribute it and/or modify it
8: * under the terms of the GNU General Public License as published by the
9: * Free Software Foundation; either version 2 of the License, or (at your
10: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
11: *
12: * This program is distributed in the hope that it will be useful, but
13: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15: * for more details.
16: */
17:
18: #include <unistd.h>
19: #include <stdlib.h>
20:
21: #include "sender.h"
22:
23: #include <daemon.h>
24: #include <network/socket.h>
25: #include <processing/jobs/callback_job.h>
26: #include <threading/thread.h>
27: #include <threading/condvar.h>
28: #include <threading/mutex.h>
29:
30:
31: typedef struct private_sender_t private_sender_t;
32:
33: /**
34: * Private data of a sender_t object.
35: */
36: struct private_sender_t {
37: /**
38: * Public part of a sender_t object.
39: */
40: sender_t public;
41:
42: /**
43: * The packets are stored in a linked list
44: */
45: linked_list_t *list;
46:
47: /**
48: * mutex to synchronize access to list
49: */
50: mutex_t *mutex;
51:
52: /**
53: * condvar to signal for packets added to list
54: */
55: condvar_t *got;
56:
57: /**
58: * condvar to signal for packets sent
59: */
60: condvar_t *sent;
61:
62: /**
63: * Delay for sending outgoing packets, to simulate larger RTT
64: */
65: int send_delay;
66:
67: /**
68: * Specific message type to delay, 0 for any
69: */
70: int send_delay_type;
71:
72: /**
73: * Delay request messages?
74: */
75: bool send_delay_request;
76:
77: /**
78: * Delay response messages?
79: */
80: bool send_delay_response;
81: };
82:
83: METHOD(sender_t, send_no_marker, void,
84: private_sender_t *this, packet_t *packet)
85: {
86: this->mutex->lock(this->mutex);
87: this->list->insert_last(this->list, packet);
88: this->got->signal(this->got);
89: this->mutex->unlock(this->mutex);
90: }
91:
92: METHOD(sender_t, send_, void,
93: private_sender_t *this, packet_t *packet)
94: {
95: host_t *src, *dst;
96:
97: src = packet->get_source(packet);
98: dst = packet->get_destination(packet);
99:
100: DBG1(DBG_NET, "sending packet: from %#H to %#H (%zu bytes)", src, dst,
101: packet->get_data(packet).len);
102:
103: if (this->send_delay)
104: {
105: message_t *message;
106:
107: message = message_create_from_packet(packet->clone(packet));
108: if (message->parse_header(message) == SUCCESS)
109: {
110: if (this->send_delay_type == 0 ||
111: this->send_delay_type == message->get_exchange_type(message))
112: {
113: if ((message->get_request(message) && this->send_delay_request) ||
114: (!message->get_request(message) && this->send_delay_response))
115: {
116: DBG1(DBG_NET, "using send delay: %dms", this->send_delay);
117: usleep(this->send_delay * 1000);
118: }
119: }
120: }
121: message->destroy(message);
122: }
123:
124: /* if neither source nor destination port is 500 we add a Non-ESP marker */
125: if (dst->get_port(dst) != IKEV2_UDP_PORT &&
126: src->get_port(src) != IKEV2_UDP_PORT)
127: {
128: chunk_t data, marker = chunk_from_chars(0x00, 0x00, 0x00, 0x00);
129:
130: data = chunk_cat("cc", marker, packet->get_data(packet));
131: packet->set_data(packet, data);
132: }
133:
134: send_no_marker(this, packet);
135: }
136:
137: /**
138: * Job callback function to send packets
139: */
140: static job_requeue_t send_packets(private_sender_t *this)
141: {
142: packet_t *packet;
143: bool oldstate;
144:
145: this->mutex->lock(this->mutex);
146: while (this->list->get_count(this->list) == 0)
147: {
148: /* add cleanup handler, wait for packet, remove cleanup handler */
149: thread_cleanup_push((thread_cleanup_t)this->mutex->unlock, this->mutex);
150: oldstate = thread_cancelability(TRUE);
151:
152: this->got->wait(this->got, this->mutex);
153:
154: thread_cancelability(oldstate);
155: thread_cleanup_pop(FALSE);
156: }
157: this->list->remove_first(this->list, (void**)&packet);
158: this->sent->signal(this->sent);
159: this->mutex->unlock(this->mutex);
160:
161: charon->socket->send(charon->socket, packet);
162: packet->destroy(packet);
163: return JOB_REQUEUE_DIRECT;
164: }
165:
166: METHOD(sender_t, flush, void,
167: private_sender_t *this)
168: {
169: /* send all packets in the queue */
170: this->mutex->lock(this->mutex);
171: while (this->list->get_count(this->list))
172: {
173: this->sent->wait(this->sent, this->mutex);
174: }
175: this->mutex->unlock(this->mutex);
176: }
177:
178: METHOD(sender_t, destroy, void,
179: private_sender_t *this)
180: {
181: this->list->destroy_offset(this->list, offsetof(packet_t, destroy));
182: this->got->destroy(this->got);
183: this->sent->destroy(this->sent);
184: this->mutex->destroy(this->mutex);
185: free(this);
186: }
187:
188: /*
189: * Described in header.
190: */
191: sender_t * sender_create()
192: {
193: private_sender_t *this;
194:
195: INIT(this,
196: .public = {
197: .send = _send_,
198: .send_no_marker = _send_no_marker,
199: .flush = _flush,
200: .destroy = _destroy,
201: },
202: .list = linked_list_create(),
203: .mutex = mutex_create(MUTEX_TYPE_DEFAULT),
204: .got = condvar_create(CONDVAR_TYPE_DEFAULT),
205: .sent = condvar_create(CONDVAR_TYPE_DEFAULT),
206: .send_delay = lib->settings->get_int(lib->settings,
207: "%s.send_delay", 0, lib->ns),
208: .send_delay_type = lib->settings->get_int(lib->settings,
209: "%s.send_delay_type", 0, lib->ns),
210: .send_delay_request = lib->settings->get_bool(lib->settings,
211: "%s.send_delay_request", TRUE, lib->ns),
212: .send_delay_response = lib->settings->get_bool(lib->settings,
213: "%s.send_delay_response", TRUE, lib->ns),
214: );
215:
216: lib->processor->queue_job(lib->processor,
217: (job_t*)callback_job_create_with_prio((callback_job_cb_t)send_packets,
218: this, NULL, (callback_job_cancel_t)return_false, JOB_PRIO_CRITICAL));
219:
220: return &this->public;
221: }
222: