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authorGravatar Nikias Bassen2009-05-18 22:29:39 +0200
committerGravatar Matt Colyer2009-05-18 18:47:20 -0700
commit8eaac0513bfb238edec22d46320669f5c9c76542 (patch)
tree2db842339bf525d67017525bcbd3f4d35181e5ca /src/usbmux.c
parentdca1758c4f9602fc240c6a7c9ae45839e154d15f (diff)
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Make use of usbmuxd and remove libusb dependencies
Signed-off-by: Matt Colyer <matt@colyer.name>
Diffstat (limited to 'src/usbmux.c')
-rw-r--r--src/usbmux.c410
1 files changed, 0 insertions, 410 deletions
diff --git a/src/usbmux.c b/src/usbmux.c
deleted file mode 100644
index 7d74b4b..0000000
--- a/src/usbmux.c
+++ /dev/null
@@ -1,410 +0,0 @@
1/*
2 * usbmux.c
3 * Interprets the usb multiplexing protocol used by the iPhone.
4 *
5 * Copyright (c) 2008 Zach C. All Rights Reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <sys/types.h>
23#include <arpa/inet.h>
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27
28#include "usbmux.h"
29#include "utils.h"
30
31static iphone_umux_client_t *connlist = NULL;
32static int clients = 0;
33
34/** Creates a USBMux packet for the given set of ports.
35 *
36 * @param s_port The source port for the connection.
37 * @param d_port The destination port for the connection.
38 *
39 * @return A USBMux packet
40 */
41usbmux_tcp_header *new_mux_packet(uint16_t s_port, uint16_t d_port)
42{
43 usbmux_tcp_header *conn = (usbmux_tcp_header *) malloc(sizeof(usbmux_tcp_header));
44 conn->type = htonl(6);
45 conn->length = 28;
46 conn->sport = htons(s_port);
47 conn->dport = htons(d_port);
48 conn->scnt = 0;
49 conn->ocnt = 0;
50 conn->offset = 0x50;
51 conn->window = htons(0x0200);
52 conn->nullnull = 0x0000;
53 conn->length16 = 28;
54 return conn;
55}
56
57/** Creates a USBMux header containing version information
58 *
59 * @return A USBMux header
60 */
61usbmux_version_header *version_header(void)
62{
63 usbmux_version_header *version = (usbmux_version_header *) malloc(sizeof(usbmux_version_header));
64 version->type = 0;
65 version->length = htonl(20);
66 version->major = htonl(1);
67 version->minor = 0;
68 version->allnull = 0;
69 return version;
70}
71
72
73// Maintenance functions.
74
75/** Removes a connection from the list of connections made.
76 * The list of connections is necessary for buffering.
77 *
78 * @param connection The connection to delete from the tracking list.
79 */
80static void delete_connection(iphone_umux_client_t connection)
81{
82 iphone_umux_client_t *newlist = (iphone_umux_client_t *) malloc(sizeof(iphone_umux_client_t) * (clients - 1));
83 int i = 0, j = 0;
84 for (i = 0; i < clients; i++) {
85 if (connlist[i] == connection)
86 continue;
87 else {
88 newlist[j] = connlist[i];
89 j++;
90 }
91 }
92 free(connlist);
93 connlist = newlist;
94 clients--;
95 if (connection->recv_buffer)
96 free(connection->recv_buffer);
97 if (connection->header)
98 free(connection->header);
99 connection->r_len = 0;
100 free(connection);
101}
102
103/** Adds a connection to the list of connections made.
104 * The connection list is necessary for buffering.
105 *
106 * @param connection The connection to add to the global list of connections.
107 */
108
109static void add_connection(iphone_umux_client_t connection)
110{
111 iphone_umux_client_t *newlist =
112 (iphone_umux_client_t *) realloc(connlist, sizeof(iphone_umux_client_t) * (clients + 1));
113 newlist[clients] = connection;
114 connlist = newlist;
115 clients++;
116}
117
118/** Initializes a connection on phone, with source port s_port and destination port d_port
119 *
120 * @param device The iPhone to initialize a connection on.
121 * @param src_port The source port
122 * @param dst_port The destination port -- 0xf27e for lockdownd.
123 * @param client A mux TCP header for the connection which is used for tracking and data transfer.
124 * @return IPHONE_E_SUCCESS on success, an error code otherwise.
125 */
126iphone_error_t iphone_mux_new_client(iphone_device_t device, uint16_t src_port, uint16_t dst_port,
127 iphone_umux_client_t * client)
128{
129 if (!device || !src_port || !dst_port)
130 return IPHONE_E_INVALID_ARG;
131
132 int bytes = 0;
133 // Initialize connection stuff
134 iphone_umux_client_t new_connection = (iphone_umux_client_t) malloc(sizeof(struct iphone_umux_client_int));
135 new_connection->header = new_mux_packet(src_port, dst_port);
136
137 // blargg
138 if (new_connection && new_connection->header) {
139 new_connection->header->tcp_flags = 0x02;
140 new_connection->header->length = htonl(new_connection->header->length);
141 new_connection->header->length16 = htons(new_connection->header->length16);
142
143 if (send_to_phone(device, (char *) new_connection->header, sizeof(usbmux_tcp_header)) >= 0) {
144 usbmux_tcp_header *response;
145 response = (usbmux_tcp_header *) malloc(sizeof(usbmux_tcp_header));
146 bytes = recv_from_phone(device, (char *) response, sizeof(*response), 3500);
147 if (response->tcp_flags != 0x12) {
148 free(response);
149 return IPHONE_E_UNKNOWN_ERROR;
150 } else {
151 free(response);
152
153 log_debug_msg("mux_connect: connection success\n");
154 new_connection->header->tcp_flags = 0x10;
155 new_connection->header->scnt = 1;
156 new_connection->header->ocnt = 1;
157 new_connection->phone = device;
158 new_connection->recv_buffer = NULL;
159 new_connection->r_len = 0;
160 add_connection(new_connection);
161 *client = new_connection;
162 return IPHONE_E_SUCCESS;
163 }
164 } else {
165 return IPHONE_E_NOT_ENOUGH_DATA;
166 }
167 }
168 // if we get to this point it's probably bad
169 return IPHONE_E_UNKNOWN_ERROR;
170}
171
172/** Cleans up the given USBMux connection.
173 * @note Once a connection is closed it may not be used again.
174 *
175 * @param connection The connection to close.
176 *
177 * @return IPHONE_E_SUCCESS on success.
178 */
179iphone_error_t iphone_mux_free_client(iphone_umux_client_t client)
180{
181 if (!client || !client->phone)
182 return IPHONE_E_INVALID_ARG;
183
184 client->header->tcp_flags = 0x04;
185 client->header->length = htonl(0x1C);
186 client->header->scnt = htonl(client->header->scnt);
187 client->header->ocnt = htonl(client->header->ocnt);
188 client->header->window = 0;
189 client->header->length16 = htons(0x1C);
190 int bytes = 0;
191
192 bytes = usb_bulk_write(client->phone->device, BULKOUT, (char *) client->header, sizeof(usbmux_tcp_header), 800);
193 if (bytes < 0)
194 log_debug_msg("iphone_muxèfree_client(): when writing, libusb gave me the error: %s\n", usb_strerror());
195
196 bytes = usb_bulk_read(client->phone->device, BULKIN, (char *) client->header, sizeof(usbmux_tcp_header), 800);
197 if (bytes < 0)
198 log_debug_msg("get_iPhone(): when reading, libusb gave me the error: %s\n", usb_strerror());
199
200 delete_connection(client);
201
202 return IPHONE_E_SUCCESS;
203}
204
205
206/** Sends the given data over the selected connection.
207 *
208 * @param phone The iPhone to send to.
209 * @param client The client we're sending data on.
210 * @param data A pointer to the data to send.
211 * @param datalen How much data we're sending.
212 * @param sent_bytes The number of bytes sent, minus the header (28)
213 *
214 * @return IPHONE_E_SUCCESS on success.
215 */
216
217iphone_error_t iphone_mux_send(iphone_umux_client_t client, const char *data, uint32_t datalen, uint32_t * sent_bytes)
218{
219 if (!client->phone || !client || !data || datalen == 0 || !sent_bytes)
220 return IPHONE_E_INVALID_ARG;
221 // client->scnt and client->ocnt should already be in host notation...
222 // we don't need to change them juuuust yet.
223 *sent_bytes = 0;
224 log_debug_msg("mux_send(): client wants to send %i bytes\n", datalen);
225 char *buffer = (char *) malloc(sizeof(usbmux_tcp_header) + datalen + 2); // allow 2 bytes of safety padding
226 // Set the length and pre-emptively htonl/htons it
227 client->header->length = htonl(sizeof(usbmux_tcp_header) + datalen);
228 client->header->length16 = htons(sizeof(usbmux_tcp_header) + datalen);
229
230 // Put scnt and ocnt into big-endian notation
231 client->header->scnt = htonl(client->header->scnt);
232 client->header->ocnt = htonl(client->header->ocnt);
233 // Concatenation of stuff in the buffer.
234 memcpy(buffer, client->header, sizeof(usbmux_tcp_header));
235 memcpy(buffer + sizeof(usbmux_tcp_header), data, datalen);
236
237 // We have a buffer full of data, we should now send it to the phone.
238 log_debug_msg("actually sending %zi bytes of data at %p\n", sizeof(usbmux_tcp_header) + datalen, buffer);
239
240
241 *sent_bytes = send_to_phone(client->phone, buffer, sizeof(usbmux_tcp_header) + datalen);
242 log_debug_msg("mux_send: sent %i bytes!\n", *sent_bytes);
243 // Now that we've sent it off, we can clean up after our sloppy selves.
244 dump_debug_buffer("packet", buffer, *sent_bytes);
245 if (buffer)
246 free(buffer);
247 // Re-calculate scnt and ocnt
248 client->header->scnt = ntohl(client->header->scnt) + datalen;
249 client->header->ocnt = ntohl(client->header->ocnt);
250
251 // Revert lengths
252 client->header->length = ntohl(client->header->length);
253 client->header->length16 = ntohs(client->header->length16);
254
255 // Now return the bytes.
256 if (*sent_bytes < sizeof(usbmux_tcp_header) + datalen) {
257 *sent_bytes = 0;
258 return IPHONE_E_NOT_ENOUGH_DATA;
259 } else {
260 *sent_bytes = *sent_bytes - 28; // actual length sent. :/
261 }
262
263 return IPHONE_E_SUCCESS;
264}
265
266/** This is a higher-level USBMuxTCP-like function
267 *
268 * @param connection The connection to receive data on.
269 * @param data Where to put the data we receive.
270 * @param datalen How much data to read.
271 * @param recv_bytes Pointer to a uint32_t that will be set
272 * to the number of bytes received.
273 * @param timeout How many milliseconds to wait for data.
274 *
275 * @return IPHONE_E_SUCCESS on success, or and error value.
276 */
277iphone_error_t iphone_mux_recv_timeout(iphone_umux_client_t client, char *data, uint32_t datalen, uint32_t * recv_bytes, int timeout)
278{
279
280 if (!client || !data || datalen == 0 || !recv_bytes)
281 return IPHONE_E_INVALID_ARG;
282 /*
283 * Order of operation:
284 * 1.) Check if the client has a pre-received buffer.
285 * 2.) If so, fill data with the buffer, as much as needed.
286 * a.) Return quickly if the buffer has enough
287 * b.) If the buffer is only part of the datalen, get the rest of datalen (and if we can't, just return)
288 * 3.) If not, receive directly from the phone.
289 * a.) Check incoming packet's ports. If proper, follow proper buffering and receiving operation.
290 * b.) If not, find the client the ports belong to and fill that client's buffer, then return mux_recv with the same args to try again.
291 */
292 log_debug_msg("mux_recv: datalen == %i\n", datalen);
293 int bytes = 0, i = 0, complex = 0, offset = 0;
294 *recv_bytes = 0;
295 char *buffer = NULL;
296 usbmux_tcp_header *header = NULL;
297
298 if (client->recv_buffer) {
299 if (client->r_len >= datalen) {
300 memcpy(data, client->recv_buffer, datalen);
301 if (client->r_len == datalen) {
302 // reset everything
303 free(client->recv_buffer);
304 client->r_len = 0;
305 client->recv_buffer = NULL;
306 } else {
307 buffer = (char *) malloc(sizeof(char) * (client->r_len - datalen));
308 memcpy(buffer, client->recv_buffer + datalen, (client->r_len - datalen));
309 client->r_len -= datalen;
310 free(client->recv_buffer);
311 client->recv_buffer = buffer;
312 }
313
314 // Since we were able to fill the data straight from our buffer, we can just return datalen. See 2a above.
315 *recv_bytes = datalen;
316 return IPHONE_E_SUCCESS;
317 } else {
318 memcpy(data, client->recv_buffer, client->r_len);
319 free(client->recv_buffer); // don't need to deal with anymore, but...
320 client->recv_buffer = NULL;
321 offset = client->r_len; // see #2b, above
322 client->r_len = 0;
323 }
324 } // End of what to do if we have a pre-buffer. See #1 and #2 above.
325
326 buffer = (char *) malloc(sizeof(char) * 131072); // make sure we get enough ;)
327
328 // See #3.
329 bytes = recv_from_phone(client->phone, buffer, 131072, timeout);
330 if (bytes < 28) {
331 free(buffer);
332 log_debug_msg("mux_recv: Did not even get the header.\n");
333 return IPHONE_E_NOT_ENOUGH_DATA;
334 }
335
336 header = (usbmux_tcp_header *) buffer;
337 if (header->sport != client->header->dport || header->dport != client->header->sport) {
338 // Ooooops -- we got someone else's packet.
339 // We gotta stick it in their buffer. (Take that any old way you want ;) )
340 for (i = 0; i < clients; i++) {
341 if (connlist[i]->header->sport == header->dport && connlist[i]->header->dport == header->sport) {
342 // we have a winner.
343 char *nfb = (char *) malloc(sizeof(char) * (connlist[i]->r_len + (bytes - 28)));
344 if (connlist[i]->recv_buffer && connlist[i]->r_len) {
345 memcpy(nfb, connlist[i]->recv_buffer, connlist[i]->r_len);
346 free(connlist[i]->recv_buffer);
347 }
348 connlist[i]->r_len += bytes - 28;
349 //connlist[i]->recv_buffer = (char*)realloc(connlist[i]->recv_buffer, sizeof(char) * client->r_len); // grow their buffer
350 connlist[i]->recv_buffer = nfb;
351 nfb = NULL; // A cookie for you if you can guess what "nfb" means.
352 complex = connlist[i]->r_len - (bytes - 28);
353 memcpy(connlist[i]->recv_buffer + complex, buffer + 28, bytes - 28); // paste into their buffer
354 connlist[i]->header->ocnt += bytes - 28;
355 }
356 }
357 // If it wasn't ours, it's been handled by this point... or forgotten.
358 // Free our buffer and continue.
359 free(buffer);
360 buffer = NULL;
361 return iphone_mux_recv(client, data, datalen, recv_bytes); // recurse back in to try again
362 }
363 // The packet was absolutely meant for us if it hits this point.
364 // The pre-buffer has been taken care of, so, again, if we're at this point we have to read from the phone.
365
366 if ((bytes - 28) > datalen) {
367 // Copy what we need into the data, buffer the rest because we can.
368 memcpy(data + offset, buffer + 28, datalen); // data+offset: see #2b, above
369 complex = client->r_len + ((bytes - 28) - datalen);
370 client->recv_buffer = (char *) realloc(client->recv_buffer, (sizeof(char) * complex));
371 client->r_len = complex;
372 complex = client->r_len - ((bytes - 28) - datalen);
373 memcpy(client->recv_buffer + complex, buffer + 28 + datalen, (bytes - 28) - datalen);
374 free(buffer);
375 client->header->ocnt += bytes - 28;
376 *recv_bytes = datalen;
377 return IPHONE_E_SUCCESS;
378 } else {
379 // Fill the data with what we have, and just return.
380 memcpy(data + offset, buffer + 28, bytes - 28); // data+offset: see #2b, above
381 client->header->ocnt += bytes - 28;
382 free(buffer);
383 *recv_bytes = bytes - 28;
384 return IPHONE_E_SUCCESS;
385 }
386
387 // If we get to this point, 'tis probably bad.
388 log_debug_msg("mux_recv: Heisenbug: bytes and datalen not matching up\n");
389 return IPHONE_E_UNKNOWN_ERROR;
390}
391
392/**
393 * This function is just like 'iphone_mux_recv_timeout' but you do not need
394 * to specify a timeout. It simply calls iphone_mux_recv_timeout with a
395 * timeout value of 3500 milliseconds.
396 *
397 * @param connection The connection to receive data on.
398 * @param data Where to put the data we receive.
399 * @param datalen How much data to read.
400 * @param recv_bytes Pointer to a uint32_t that will be set
401 * to the number of bytes received.
402 *
403 * @return The return value of iphone_mux_recv_timeout.
404 *
405 * @see iphone_mux_recv_timeout
406 */
407iphone_error_t iphone_mux_recv(iphone_umux_client_t client, char *data, uint32_t datalen, uint32_t * recv_bytes)
408{
409 return iphone_mux_recv_timeout(client, data, datalen, recv_bytes, 3500);
410}
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