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/* $OpenBSD: xmodem.c,v 1.8 2015/10/05 23:15:31 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'
#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);
}
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