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
|
/* $OpenBSD: xmodem.c,v 1.1 2012/07/10 11:42:02 nicm 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 <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'
volatile sig_atomic_t xmodem_stop;
void
xmodem_signal(int sig)
{
xmodem_stop = 1;
}
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 + 1], c;
size_t len;
uint8_t num;
u_int i;
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");
}
num = 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;
buf[3 + XMODEM_BLOCK] = 0;
for (i = 0; i < 128; 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,
num, 1 + i);
if (xmodem_write(buf, sizeof buf) != 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++;
}
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_termios();
sigaction(SIGINT, &oact, NULL);
return;
}
|
