1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/* $OpenBSD: xmodem.c,v 1.9 2016/02/04 18:33:30 millert Exp $ */
/*
* Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "cu.h"
#define XMODEM_BLOCK 128
#define XMODEM_RETRIES 10
#define XMODEM_SOH '\001'
#define XMODEM_EOT '\004'
#define XMODEM_ACK '\006'
#define XMODEM_NAK '\025'
#define XMODEM_SUB '\032'
#define XMODEM_C '\103'
volatile sig_atomic_t xmodem_stop;
void xmodem_signal(int sig);
uint16_t xmodem_crc16(const u_char *buf, size_t len);
int xmodem_read(char *c);
int xmodem_write(const u_char *buf, size_t len);
void
xmodem_signal(int sig)
{
xmodem_stop = 1;
}
uint16_t
xmodem_crc16(const u_char *buf, size_t len)
{
uint16_t crc;
u_int i, j;
crc = 0;
for (i = 0; i < len; i++) {
crc = crc ^ *buf++ << 8;
for (j = 0; j < 8; j++)
if (crc & 0x8000)
crc = crc << 1 ^ 0x1021;
else
crc = crc << 1;
}
return (crc);
}
int
xmodem_read(char *c)
{
for (;;) {
switch (read(line_fd, c, 1)) {
case -1:
if (errno == EINTR && !xmodem_stop)
continue;
return (-1);
case 0:
errno = EPIPE;
return (-1);
case 1:
return (0);
}
}
}
int
xmodem_write(const u_char *buf, size_t len)
{
ssize_t n;
while (len > 0) {
n = write(line_fd, buf, len);
if (n == -1) {
if (errno == EINTR && !xmodem_stop)
continue;
return (-1);
}
buf += n;
len -= n;
}
return (0);
}
void
xmodem_send(const char *file)
{
FILE *f;
u_char buf[3 + XMODEM_BLOCK + 2], c;
size_t len, pktlen;
uint8_t num;
uint16_t crc;
int crc_mode;
u_int i, total;
struct termios tio;
struct sigaction act, oact;
f = fopen(file, "r");
if (f == NULL) {
cu_warn("%s", file);
return;
}
memset(&act, 0, sizeof(act));
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = xmodem_signal;
if (sigaction(SIGINT, &act, &oact) != 0)
cu_err(1, "sigaction");
xmodem_stop = 0;
if (isatty(STDIN_FILENO)) {
memcpy(&tio, &saved_tio, sizeof(tio));
tio.c_lflag &= ~ECHO;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
cu_err(1, "tcsetattr");
}
set_blocking(line_fd, 1);
tcflush(line_fd, TCIFLUSH);
if (xmodem_read(&c) != 0)
goto fail;
if (c == XMODEM_C)
crc_mode = 1;
else if (c == XMODEM_NAK)
crc_mode = 0;
else {
cu_warnx("%s: unexpected response \\%03hho", file, c);
goto fail;
}
num = 1;
total = 1;
pktlen = 3 + XMODEM_BLOCK + (crc_mode ? 2 : 1);
for (;;) {
len = fread(buf + 3, 1, XMODEM_BLOCK, f);
if (len == 0)
break;
memset(buf + 3 + len, XMODEM_SUB, XMODEM_BLOCK - len);
buf[0] = XMODEM_SOH;
buf[1] = num;
buf[2] = 255 - num;
if (crc_mode) {
crc = xmodem_crc16(buf + 3, XMODEM_BLOCK);
buf[3 + XMODEM_BLOCK] = crc >> 8;
buf[3 + XMODEM_BLOCK + 1] = crc & 0xFF;
} else {
buf[3 + XMODEM_BLOCK] = 0;
for (i = 0; i < XMODEM_BLOCK; i++)
buf[3 + XMODEM_BLOCK] += buf[3 + i];
}
for (i = 0; i < XMODEM_RETRIES; i++) {
if (xmodem_stop) {
errno = EINTR;
goto fail;
}
cu_warnx("%s: sending block %u (attempt %u)", file,
total, 1 + i);
if (xmodem_write(buf, pktlen) != 0)
goto fail;
if (xmodem_read(&c) != 0)
goto fail;
if (c == XMODEM_ACK)
break;
if (c != XMODEM_NAK) {
cu_warnx("%s: unexpected response \\%03hho",
file, c);
}
}
if (i == XMODEM_RETRIES) {
cu_warnx("%s: too many retries", file);
goto out;
}
if (len < XMODEM_BLOCK)
break;
num++;
total++;
}
buf[0] = XMODEM_EOT;
if (xmodem_write(buf, 1) != 0)
goto fail;
cu_warnx("%s: completed %u blocks", file, num);
goto out;
fail:
cu_warn("%s", file);
out:
set_blocking(line_fd, 0);
set_termios();
sigaction(SIGINT, &oact, NULL);
fclose(f);
}
|
