protocol.c revision f838788e6a4d57634a53eb597ee76a597feffcb5 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#define min(a, b) \
30    ({ typeof(a) _a = (a); typeof(b) _b = (b); (_a < _b) ? _a : _b; })
31#define round_down(a, b) \
32    ({ typeof(a) _a = (a); typeof(b) _b = (b); _a - (_a % _b); })
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <errno.h>
38
39#include <sparse/sparse.h>
40
41#include "fastboot.h"
42
43static char ERROR[128];
44
45char *fb_get_error(void)
46{
47    return ERROR;
48}
49
50static int check_response(usb_handle *usb, unsigned int size, char *response)
51{
52    unsigned char status[65];
53    int r;
54
55    for(;;) {
56        r = usb_read(usb, status, 64);
57        if(r < 0) {
58            sprintf(ERROR, "status read failed (%s)", strerror(errno));
59            usb_close(usb);
60            return -1;
61        }
62        status[r] = 0;
63
64        if(r < 4) {
65            sprintf(ERROR, "status malformed (%d bytes)", r);
66            usb_close(usb);
67            return -1;
68        }
69
70        if(!memcmp(status, "INFO", 4)) {
71            fprintf(stderr,"(bootloader) %s\n", status + 4);
72            continue;
73        }
74
75        if(!memcmp(status, "OKAY", 4)) {
76            if(response) {
77                strcpy(response, (char*) status + 4);
78            }
79            return 0;
80        }
81
82        if(!memcmp(status, "FAIL", 4)) {
83            if(r > 4) {
84                sprintf(ERROR, "remote: %s", status + 4);
85            } else {
86                strcpy(ERROR, "remote failure");
87            }
88            return -1;
89        }
90
91        if(!memcmp(status, "DATA", 4) && size > 0){
92            unsigned dsize = strtoul((char*) status + 4, 0, 16);
93            if(dsize > size) {
94                strcpy(ERROR, "data size too large");
95                usb_close(usb);
96                return -1;
97            }
98            return dsize;
99        }
100
101        strcpy(ERROR,"unknown status code");
102        usb_close(usb);
103        break;
104    }
105
106    return -1;
107}
108
109static int _command_start(usb_handle *usb, const char *cmd, unsigned size,
110                          char *response)
111{
112    int cmdsize = strlen(cmd);
113    int r;
114
115    if(response) {
116        response[0] = 0;
117    }
118
119    if(cmdsize > 64) {
120        sprintf(ERROR,"command too large");
121        return -1;
122    }
123
124    if(usb_write(usb, cmd, cmdsize) != cmdsize) {
125        sprintf(ERROR,"command write failed (%s)", strerror(errno));
126        usb_close(usb);
127        return -1;
128    }
129
130    return check_response(usb, size, response);
131}
132
133static int _command_data(usb_handle *usb, const void *data, unsigned size)
134{
135    int r;
136
137    r = usb_write(usb, data, size);
138    if(r < 0) {
139        sprintf(ERROR, "data transfer failure (%s)", strerror(errno));
140        usb_close(usb);
141        return -1;
142    }
143    if(r != ((int) size)) {
144        sprintf(ERROR, "data transfer failure (short transfer)");
145        usb_close(usb);
146        return -1;
147    }
148
149    return r;
150}
151
152static int _command_end(usb_handle *usb)
153{
154    int r;
155    r = check_response(usb, 0, 0);
156    if(r < 0) {
157        return -1;
158    }
159    return 0;
160}
161
162static int _command_send(usb_handle *usb, const char *cmd,
163                         const void *data, unsigned size,
164                         char *response)
165{
166    int r;
167    if (size == 0) {
168        return -1;
169    }
170
171    r = _command_start(usb, cmd, size, response);
172    if (r < 0) {
173        return -1;
174    }
175
176    r = _command_data(usb, data, size);
177    if (r < 0) {
178        return -1;
179    }
180
181    r = _command_end(usb);
182    if(r < 0) {
183        return -1;
184    }
185
186    return size;
187}
188
189static int _command_send_no_data(usb_handle *usb, const char *cmd,
190                                 char *response)
191{
192    int r;
193
194    return _command_start(usb, cmd, 0, response);
195}
196
197int fb_command(usb_handle *usb, const char *cmd)
198{
199    return _command_send_no_data(usb, cmd, 0);
200}
201
202int fb_command_response(usb_handle *usb, const char *cmd, char *response)
203{
204    return _command_send_no_data(usb, cmd, response);
205}
206
207int fb_download_data(usb_handle *usb, const void *data, unsigned size)
208{
209    char cmd[64];
210    int r;
211
212    sprintf(cmd, "download:%08x", size);
213    r = _command_send(usb, cmd, data, size, 0);
214
215    if(r < 0) {
216        return -1;
217    } else {
218        return 0;
219    }
220}
221
222#define USB_BUF_SIZE 512
223static char usb_buf[USB_BUF_SIZE];
224static int usb_buf_len;
225
226static int fb_download_data_sparse_write(void *priv, const void *data, int len)
227{
228    int r;
229    usb_handle *usb = priv;
230    int to_write;
231    const char *ptr = data;
232
233    if (usb_buf_len) {
234        to_write = min(USB_BUF_SIZE - usb_buf_len, len);
235
236        memcpy(usb_buf + usb_buf_len, ptr, to_write);
237        usb_buf_len += to_write;
238        ptr += to_write;
239        len -= to_write;
240    }
241
242    if (usb_buf_len == USB_BUF_SIZE) {
243        r = _command_data(usb, usb_buf, USB_BUF_SIZE);
244        if (r != USB_BUF_SIZE) {
245            return -1;
246        }
247        usb_buf_len = 0;
248    }
249
250    if (len > USB_BUF_SIZE) {
251        if (usb_buf_len > 0) {
252            sprintf(ERROR, "internal error: usb_buf not empty\n");
253            return -1;
254        }
255        to_write = round_down(len, USB_BUF_SIZE);
256        r = _command_data(usb, ptr, to_write);
257        if (r != to_write) {
258            return -1;
259        }
260        ptr += to_write;
261        len -= to_write;
262    }
263
264    if (len > 0) {
265        if (len > USB_BUF_SIZE) {
266            sprintf(ERROR, "internal error: too much left for usb_buf\n");
267            return -1;
268        }
269        memcpy(usb_buf, ptr, len);
270        usb_buf_len = len;
271    }
272
273    return 0;
274}
275
276static int fb_download_data_sparse_flush(usb_handle *usb)
277{
278    int r;
279
280    if (usb_buf_len > 0) {
281        r = _command_data(usb, usb_buf, usb_buf_len);
282        if (r != usb_buf_len) {
283            return -1;
284        }
285        usb_buf_len = 0;
286    }
287
288    return 0;
289}
290
291int fb_download_data_sparse(usb_handle *usb, struct sparse_file *s)
292{
293    char cmd[64];
294    int r;
295    int size = sparse_file_len(s, true, false);
296    if (size <= 0) {
297        return -1;
298    }
299
300    sprintf(cmd, "download:%08x", size);
301    r = _command_start(usb, cmd, size, 0);
302    if (r < 0) {
303        return -1;
304    }
305
306    r = sparse_file_callback(s, true, false, fb_download_data_sparse_write, usb);
307    if (r < 0) {
308        return -1;
309    }
310
311    fb_download_data_sparse_flush(usb);
312
313    return _command_end(usb);
314}
315