1: /*
2: * Purple's oscar protocol plugin
3: * This file is the legal property of its developers.
4: * Please see the AUTHORS file distributed alongside this file.
5: *
6: * This library is free software; you can redistribute it and/or
7: * modify it under the terms of the GNU Lesser General Public
8: * License as published by the Free Software Foundation; either
9: * version 2 of the License, or (at your option) any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
19: */
20:
21: #ifdef HAVE_CONFIG_H
22: #include <config.h>
23: #endif
24:
25: #include "oscar.h"
26: #include "peer.h"
27:
28: static void
29: peer_proxy_send(PeerConnection *conn, ProxyFrame *frame)
30: {
31: size_t length;
32: ByteStream bs;
33:
34: purple_debug_info("oscar", "Outgoing peer proxy frame with "
35: "type=0x%04hx, unknown=0x%08x, flags=0x%04hx, and "
36: "payload length=%" G_GSIZE_FORMAT "\n",
37: frame->type, frame->unknown,
38: frame->flags, frame->payload.len);
39:
40: length = 12 + frame->payload.len;
41: byte_stream_new(&bs, length);
42: byte_stream_put16(&bs, length - 2);
43: byte_stream_put16(&bs, PEER_PROXY_PACKET_VERSION);
44: byte_stream_put16(&bs, frame->type);
45: byte_stream_put32(&bs, frame->unknown);
46: byte_stream_put16(&bs, frame->flags);
47: byte_stream_putraw(&bs, frame->payload.data, frame->payload.len);
48:
49: peer_connection_send(conn, &bs);
50:
51: byte_stream_destroy(&bs);
52: }
53:
54: /**
55: * Create a rendezvous "init send" packet and send it on its merry way.
56: * This is the first packet sent to the proxy server by the first client
57: * to indicate that this will be a proxied connection
58: *
59: * @param conn The peer connection.
60: */
61: static void
62: peer_proxy_send_create_new_conn(PeerConnection *conn)
63: {
64: ProxyFrame frame;
65: PurpleAccount *account;
66: const gchar *bn;
67: guint8 bn_length;
68:
69: memset(&frame, 0, sizeof(ProxyFrame));
70: frame.type = PEER_PROXY_TYPE_CREATE;
71: frame.flags = 0x0000;
72:
73: account = purple_connection_get_account(conn->od->gc);
74: bn = purple_account_get_username(account);
75: bn_length = strlen(bn);
76: byte_stream_new(&frame.payload, 1 + bn_length + 8 + 20);
77: byte_stream_put8(&frame.payload, bn_length);
78: byte_stream_putraw(&frame.payload, (const guint8 *)bn, bn_length);
79: byte_stream_putraw(&frame.payload, conn->cookie, 8);
80:
81: byte_stream_put16(&frame.payload, 0x0001); /* Type */
82: byte_stream_put16(&frame.payload, 16); /* Length */
83: byte_stream_putcaps(&frame.payload, conn->type); /* Value */
84:
85: peer_proxy_send(conn, &frame);
86:
87: byte_stream_destroy(&frame.payload);
88: }
89:
90: /**
91: * Create a rendezvous "init recv" packet and send it on its merry way.
92: * This is the first packet sent to the proxy server by the second client
93: * involved in this rendezvous proxy session.
94: *
95: * @param conn The peer connection.
96: * @param pin The 2 byte PIN sent to us by the other user. This acts
97: * as our passcode when establishing the proxy session.
98: */
99: static void
100: peer_proxy_send_join_existing_conn(PeerConnection *conn, guint16 pin)
101: {
102: ProxyFrame frame;
103: PurpleAccount *account;
104: const gchar *bn;
105: guint8 bn_length;
106:
107: memset(&frame, 0, sizeof(ProxyFrame));
108: frame.type = PEER_PROXY_TYPE_JOIN;
109: frame.flags = 0x0000;
110:
111: account = purple_connection_get_account(conn->od->gc);
112: bn = purple_account_get_username(account);
113: bn_length = strlen(bn);
114: byte_stream_new(&frame.payload, 1 + bn_length + 2 + 8 + 20);
115: byte_stream_put8(&frame.payload, bn_length);
116: byte_stream_putraw(&frame.payload, (const guint8 *)bn, bn_length);
117: byte_stream_put16(&frame.payload, pin);
118: byte_stream_putraw(&frame.payload, conn->cookie, 8);
119:
120: byte_stream_put16(&frame.payload, 0x0001); /* Type */
121: byte_stream_put16(&frame.payload, 16); /* Length */
122: byte_stream_putcaps(&frame.payload, conn->type); /* Value */
123:
124: peer_proxy_send(conn, &frame);
125:
126: byte_stream_destroy(&frame.payload);
127: }
128:
129: /**
130: * Handle an incoming peer proxy negotiation frame.
131: */
132: static void
133: peer_proxy_recv_frame(PeerConnection *conn, ProxyFrame *frame)
134: {
135: purple_debug_info("oscar", "Incoming peer proxy frame with "
136: "type=0x%04hx, unknown=0x%08x, flags=0x%04hx, and "
137: "payload length=%" G_GSIZE_FORMAT "\n", frame->type,
138: frame->unknown, frame->flags, frame->payload.len);
139:
140: if (frame->type == PEER_PROXY_TYPE_CREATED)
141: {
142: /*
143: * Read in 2 byte port then 4 byte IP and tell the
144: * remote user to connect to it by sending an ICBM.
145: */
146: guint16 pin;
147: int i;
148: guint8 ip[4];
149:
150: pin = byte_stream_get16(&frame->payload);
151: for (i = 0; i < 4; i++)
152: ip[i] = byte_stream_get8(&frame->payload);
153: if (conn->type == OSCAR_CAPABILITY_DIRECTIM)
154: aim_im_sendch2_odc_requestproxy(conn->od,
155: conn->cookie,
156: conn->bn, ip, pin, ++conn->lastrequestnumber);
157: else if (conn->type == OSCAR_CAPABILITY_SENDFILE)
158: {
159: aim_im_sendch2_sendfile_requestproxy(conn->od,
160: conn->cookie, conn->bn,
161: ip, pin, ++conn->lastrequestnumber,
162: (const gchar *)conn->xferdata.name,
163: conn->xferdata.size, conn->xferdata.totfiles);
164: }
165: }
166: else if (frame->type == PEER_PROXY_TYPE_READY)
167: {
168: purple_input_remove(conn->watcher_incoming);
169: conn->watcher_incoming = 0;
170:
171: peer_connection_finalize_connection(conn);
172: }
173: else if (frame->type == PEER_PROXY_TYPE_ERROR)
174: {
175: if (byte_stream_bytes_left(&frame->payload) >= 2)
176: {
177: guint16 error;
178: const char *msg;
179: error = byte_stream_get16(&frame->payload);
180: if (error == 0x000d)
181: msg = "bad request";
182: else if (error == 0x0010)
183: msg = "initial request timed out";
184: else if (error == 0x001a)
185: msg ="accept period timed out";
186: else
187: msg = "unknown reason";
188: purple_debug_info("oscar", "Proxy negotiation failed with "
189: "error 0x%04hx: %s\n", error, msg);
190: }
191: else
192: {
193: purple_debug_warning("oscar", "Proxy negotiation failed with "
194: "an unknown error\n");
195: }
196: peer_connection_trynext(conn);
197: }
198: else
199: {
200: purple_debug_warning("oscar", "Unknown peer proxy frame type 0x%04hx.\n",
201: frame->type);
202: }
203: }
204:
205: static void
206: peer_proxy_connection_recv_cb(gpointer data, gint source, PurpleInputCondition cond)
207: {
208: PeerConnection *conn;
209: gssize read;
210: ProxyFrame *frame;
211:
212: conn = data;
213: frame = conn->frame;
214:
215: /* Start reading a new proxy frame */
216: if (frame == NULL)
217: {
218: /* Read the first 12 bytes (frame length and header) */
219: read = recv(conn->fd, conn->proxy_header + conn->proxy_header_received,
220: 12 - conn->proxy_header_received, 0);
221:
222: /* Check if the proxy server closed the connection */
223: if (read == 0)
224: {
225: purple_debug_info("oscar", "Peer proxy server closed connection\n");
226: peer_connection_trynext(conn);
227: return;
228: }
229:
230: /* If there was an error then close the connection */
231: if (read < 0)
232: {
233: if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
234: /* No worries */
235: return;
236:
237: purple_debug_info("oscar", "Lost connection with peer proxy server\n");
238: peer_connection_trynext(conn);
239: return;
240: }
241:
242: conn->lastactivity = time(NULL);
243:
244: /* If we don't even have the first 12 bytes then do nothing */
245: conn->proxy_header_received += read;
246: if (conn->proxy_header_received < 12)
247: return;
248:
249: /* We only support a specific version of the proxy protocol */
250: if (aimutil_get16(&conn->proxy_header[2]) != PEER_PROXY_PACKET_VERSION)
251: {
252: purple_debug_warning("oscar", "Expected peer proxy protocol "
253: "version %u but received version %u. Closing "
254: "connection.\n", PEER_PROXY_PACKET_VERSION,
255: aimutil_get16(&conn->proxy_header[2]));
256: peer_connection_trynext(conn);
257: return;
258: }
259:
260: /* Initialize a new temporary ProxyFrame for incoming data */
261: frame = g_new0(ProxyFrame, 1);
262: frame->payload.len = aimutil_get16(&conn->proxy_header[0]) - 10;
263: frame->version = aimutil_get16(&conn->proxy_header[2]);
264: frame->type = aimutil_get16(&conn->proxy_header[4]);
265: frame->unknown = aimutil_get16(&conn->proxy_header[6]);
266: frame->flags = aimutil_get16(&conn->proxy_header[10]);
267: if (frame->payload.len > 0)
268: frame->payload.data = g_new(guint8, frame->payload.len);
269: conn->frame = frame;
270: }
271:
272: /* If this frame has a payload then attempt to read it */
273: if (frame->payload.len - frame->payload.offset > 0)
274: {
275: /* Read data into the temporary buffer until it is complete */
276: read = recv(conn->fd,
277: &frame->payload.data[frame->payload.offset],
278: frame->payload.len - frame->payload.offset,
279: 0);
280:
281: /* Check if the proxy server closed the connection */
282: if (read == 0)
283: {
284: purple_debug_info("oscar", "Peer proxy server closed connection\n");
285: g_free(frame->payload.data);
286: g_free(frame);
287: conn->frame = NULL;
288: peer_connection_trynext(conn);
289: return;
290: }
291:
292: /* If there was an error then close the connection */
293: if (read < 0)
294: {
295: if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
296: /* No worries */
297: return;
298:
299: purple_debug_info("oscar", "Lost connection with peer proxy server\n");
300: g_free(frame->payload.data);
301: g_free(frame);
302: conn->frame = NULL;
303: peer_connection_trynext(conn);
304: return;
305: }
306:
307: frame->payload.offset += read;
308: }
309:
310: conn->lastactivity = time(NULL);
311: if (frame->payload.offset < frame->payload.len)
312: /* Waiting for more data to arrive */
313: return;
314:
315: /* We have a complete proxy frame! Handle it and continue reading */
316: conn->frame = NULL;
317: byte_stream_rewind(&frame->payload);
318: peer_proxy_recv_frame(conn, frame);
319:
320: g_free(frame->payload.data);
321: g_free(frame);
322:
323: conn->proxy_header_received = 0;
324: }
325:
326: /**
327: * We tried to make an outgoing connection to a proxy server. It
328: * either connected or failed to connect.
329: */
330: void
331: peer_proxy_connection_established_cb(gpointer data, gint source, const gchar *error_message)
332: {
333: PeerConnection *conn;
334:
335: conn = data;
336:
337: conn->verified_connect_data = NULL;
338:
339: if (source < 0)
340: {
341: peer_connection_trynext(conn);
342: return;
343: }
344:
345: conn->fd = source;
346: conn->watcher_incoming = purple_input_add(conn->fd,
347: PURPLE_INPUT_READ, peer_proxy_connection_recv_cb, conn);
348:
349: if (conn->proxyip != NULL)
350: /* Connect to the session created by the remote user */
351: peer_proxy_send_join_existing_conn(conn, conn->port);
352: else
353: /* Create a new session */
354: peer_proxy_send_create_new_conn(conn);
355: }
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