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authorGlenn L McGrath <bug1@ihug.co.nz>2003-12-20 07:30:35 +0000
committerGlenn L McGrath <bug1@ihug.co.nz>2003-12-20 07:30:35 +0000
commit8f3bc4ce52448a6d1c188055d6920e5bb05334b1 (patch)
tree03eac311cc3e5d298158998aca9211cc82eb41b6 /miscutils/rx.c
parenta8d82fe52e4a114dcb152ebb2fe0382e10b32267 (diff)
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New applet, rx, by Christopher Hoover
Diffstat (limited to 'miscutils/rx.c')
-rw-r--r--miscutils/rx.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/miscutils/rx.c b/miscutils/rx.c
new file mode 100644
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--- /dev/null
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1/*-------------------------------------------------------------------------
2 * Filename: xmodem.c
3 * Version: $Id: rx.c,v 1.1 2003/12/20 07:30:35 bug1 Exp $
4 * Copyright: Copyright (C) 2001, Hewlett-Packard Company
5 * Author: Christopher Hoover <ch@hpl.hp.com>
6 * Description: xmodem functionality for uploading of kernels
7 * and the like
8 * Created at: Thu Dec 20 01:58:08 PST 2001
9 *-----------------------------------------------------------------------*/
10/*
11 * xmodem.c: xmodem functionality for uploading of kernels and
12 * the like
13 *
14 * Copyright (C) 2001 Hewlett-Packard Laboratories
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 *
31 * This was originally written for blob and then adapted for busybox.
32 *
33 */
34
35#include <stdlib.h>
36#include <stdarg.h>
37#include <stdio.h>
38#include <unistd.h>
39#include <errno.h>
40#include <termios.h>
41#include <signal.h>
42#include <sys/types.h>
43#include <sys/stat.h>
44#include <fcntl.h>
45#include <string.h>
46#include "busybox.h"
47
48
49#define SOH 0x01
50#define STX 0x02
51#define EOT 0x04
52#define ACK 0x06
53#define NAK 0x15
54#define CAN 0x18
55#define BS 0x08
56
57/*
58
59Cf:
60
61 http://www.textfiles.com/apple/xmodem
62 http://www.phys.washington.edu/~belonis/xmodem/docxmodem.txt
63 http://www.phys.washington.edu/~belonis/xmodem/docymodem.txt
64 http://www.phys.washington.edu/~belonis/xmodem/modmprot.col
65
66*/
67
68#define TIMEOUT 1
69#define TIMEOUT_LONG 10
70#define MAXERRORS 10
71
72static inline void write_byte(int fd, char cc) {
73 write(fd, &cc, 1);
74}
75
76static inline void write_flush(int fd) {
77 tcdrain(fd);
78}
79
80static inline void read_flush(int fd) {
81 tcflush(fd, TCIFLUSH);
82}
83
84static int read_byte(int fd, unsigned int timeout) {
85 char buf[1];
86 int n;
87
88 alarm(timeout);
89
90 n = read(fd, &buf, 1);
91
92 alarm(0);
93
94 if (n == 1)
95 return buf[0] & 0xff;
96 else
97 return -1;
98}
99
100static int receive(char *error_buf, size_t error_buf_size,
101 int ttyfd, int filefd)
102{
103 char blockBuf[1024];
104 unsigned int errors = 0;
105 unsigned int wantBlockNo = 1;
106 unsigned int length = 0;
107 int docrc = 1;
108 char nak = 'C';
109 unsigned int timeout = TIMEOUT_LONG;
110
111#define note_error(fmt,args...) \
112 snprintf(error_buf, error_buf_size, fmt,##args)
113
114 read_flush(ttyfd);
115
116 /* Ask for CRC; if we get errors, we will go with checksum */
117 write_byte(ttyfd, nak);
118 write_flush(ttyfd);
119
120 for (;;) {
121 int blockBegin;
122 int blockNo, blockNoOnesCompl;
123 int blockLength;
124 int cksum = 0;
125 int crcHi = 0;
126 int crcLo = 0;
127
128 blockBegin = read_byte(ttyfd, timeout);
129 if (blockBegin < 0)
130 goto timeout;
131
132 timeout = TIMEOUT;
133 nak = NAK;
134
135 switch (blockBegin) {
136 case SOH:
137 case STX:
138 break;
139
140 case EOT:
141 write_byte(ttyfd, ACK);
142 write_flush(ttyfd);
143 goto done;
144
145 default:
146 goto error;
147 }
148
149 /* block no */
150 blockNo = read_byte(ttyfd, TIMEOUT);
151 if (blockNo < 0)
152 goto timeout;
153
154 /* block no one's compliment */
155 blockNoOnesCompl = read_byte(ttyfd, TIMEOUT);
156 if (blockNoOnesCompl < 0)
157 goto timeout;
158
159 if (blockNo != (255 - blockNoOnesCompl)) {
160 note_error("bad block ones compl");
161 goto error;
162 }
163
164 blockLength = (blockBegin == SOH) ? 128 : 1024;
165
166 {
167 int i;
168
169 for (i = 0; i < blockLength; i++) {
170 int cc = read_byte(ttyfd, TIMEOUT);
171 if (cc < 0)
172 goto timeout;
173 blockBuf[i] = cc;
174 }
175 }
176
177 if (docrc) {
178 crcHi = read_byte(ttyfd, TIMEOUT);
179 if (crcHi < 0)
180 goto timeout;
181
182 crcLo = read_byte(ttyfd, TIMEOUT);
183 if (crcLo < 0)
184 goto timeout;
185 } else {
186 cksum = read_byte(ttyfd, TIMEOUT);
187 if (cksum < 0)
188 goto timeout;
189 }
190
191 if (blockNo == ((wantBlockNo - 1) & 0xff)) {
192 /* a repeat of the last block is ok, just ignore it. */
193 /* this also ignores the initial block 0 which is */
194 /* meta data. */
195 goto next;
196 } else if (blockNo != (wantBlockNo & 0xff)) {
197 note_error("unexpected block no, 0x%08x, expecting 0x%08x", blockNo, wantBlockNo);
198 goto error;
199 }
200
201 if (docrc) {
202 int crc = 0;
203 int i, j;
204 int expectedCrcHi;
205 int expectedCrcLo;
206
207 for (i = 0; i < blockLength; i++) {
208 crc = crc ^ (int) blockBuf[i] << 8;
209 for (j = 0; j < 8; j++)
210 if (crc & 0x8000)
211 crc = crc << 1 ^ 0x1021;
212 else
213 crc = crc << 1;
214 }
215
216 expectedCrcHi = (crc >> 8) & 0xff;
217 expectedCrcLo = crc & 0xff;
218
219 if ((crcHi != expectedCrcHi) ||
220 (crcLo != expectedCrcLo)) {
221 note_error("crc error, expected 0x%02x 0x%02x, got 0x%02x 0x%02x", expectedCrcHi, expectedCrcLo, crcHi, crcLo);
222 goto error;
223 }
224 } else {
225 unsigned char expectedCksum = 0;
226 int i;
227
228 for (i = 0; i < blockLength; i++)
229 expectedCksum += blockBuf[i];
230
231 if (cksum != expectedCksum) {
232 note_error("checksum error, expected 0x%02x, got 0x%02x", expectedCksum, cksum);
233 goto error;
234 }
235 }
236
237 wantBlockNo++;
238 length += blockLength;
239
240 if (bb_full_write(filefd, blockBuf, blockLength) < 0) {
241 note_error("write to file failed: %m");
242 goto fatal;
243 }
244
245 next:
246 errors = 0;
247 write_byte(ttyfd, ACK);
248 write_flush(ttyfd);
249 continue;
250
251 error:
252 timeout:
253 errors++;
254 if (errors == MAXERRORS) {
255 /* Abort */
256 int i;
257
258 // if using crc, try again w/o crc
259 if (nak == 'C') {
260 nak = NAK;
261 errors = 0;
262 docrc = 0;
263 goto timeout;
264 }
265
266 note_error("too many errors; giving up");
267
268 fatal:
269 for (i = 0; i < 5; i ++)
270 write_byte(ttyfd, CAN);
271 for (i = 0; i < 5; i ++)
272 write_byte(ttyfd, BS);
273 write_flush(ttyfd);
274 return -1;
275 }
276
277 read_flush(ttyfd);
278 write_byte(ttyfd, nak);
279 write_flush(ttyfd);
280 }
281
282 done:
283 return length;
284
285#undef note_error
286}
287
288static void sigalrm_handler(int signum)
289{
290}
291
292int rx_main(int argc, char **argv)
293{
294 char *fn;
295 int ttyfd, filefd;
296 struct termios tty, orig_tty;
297 struct sigaction act;
298 int n;
299 char error_buf[256];
300
301 if (argc != 2)
302 bb_show_usage();
303
304 fn = argv[1];
305 ttyfd = open("/dev/tty", O_RDWR);
306 if (ttyfd < 0)
307 bb_error_msg_and_die("%s: open on /dev/tty failed: %m\n", argv[0]);
308
309 filefd = open(fn, O_RDWR|O_CREAT|O_TRUNC, 0666);
310 if (filefd < 0)
311 bb_error_msg_and_die("%s: open on %s failed: %m\n", argv[0], fn);
312
313 if (tcgetattr(ttyfd, &tty) < 0)
314 bb_error_msg_and_die("%s: tcgetattr failed: %m\n", argv[0]);
315
316 orig_tty = tty;
317
318 cfmakeraw(&tty);
319 tcsetattr(ttyfd, TCSAFLUSH, &tty);
320
321 memset(&act, 0, sizeof(act));
322 act.sa_handler = sigalrm_handler;
323 sigaction(SIGALRM, &act, 0);
324
325 n = receive(error_buf, sizeof(error_buf), ttyfd, filefd);
326
327 close(filefd);
328
329 tcsetattr(ttyfd, TCSAFLUSH, &orig_tty);
330
331 if (n < 0)
332 bb_error_msg_and_die("\n%s: receive failed:\n %s\n",
333 argv[0], error_buf);
334
335 bb_fflush_stdout_and_exit(EXIT_SUCCESS);
336}
337
338/*
339Local Variables:
340c-file-style: "linux"
341c-basic-offset: 4
342tab-width: 4
343End:
344*/
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-17 03:14:53 +0000