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-rw-r--r--release/src/router/busybox/miscutils/rx.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/release/src/router/busybox/miscutils/rx.c b/release/src/router/busybox/miscutils/rx.c
new file mode 100644
index 00000000..94eb4522
--- /dev/null
+++ b/release/src/router/busybox/miscutils/rx.c
@@ -0,0 +1,254 @@
+/* vi: set sw=4 ts=4: */
+/*-------------------------------------------------------------------------
+ * Filename: xmodem.c
+ * Copyright: Copyright (C) 2001, Hewlett-Packard Company
+ * Author: Christopher Hoover <ch@hpl.hp.com>
+ * Description: xmodem functionality for uploading of kernels
+ * and the like
+ * Created at: Thu Dec 20 01:58:08 PST 2001
+ *-----------------------------------------------------------------------*/
+/*
+ * xmodem.c: xmodem functionality for uploading of kernels and
+ * the like
+ *
+ * Copyright (C) 2001 Hewlett-Packard Laboratories
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ *
+ * This was originally written for blob and then adapted for busybox.
+ */
+
+#include "libbb.h"
+
+#define SOH 0x01
+#define STX 0x02
+#define EOT 0x04
+#define ACK 0x06
+#define NAK 0x15
+#define BS 0x08
+
+/*
+Cf:
+ http://www.textfiles.com/apple/xmodem
+ http://www.phys.washington.edu/~belonis/xmodem/docxmodem.txt
+ http://www.phys.washington.edu/~belonis/xmodem/docymodem.txt
+ http://www.phys.washington.edu/~belonis/xmodem/modmprot.col
+*/
+
+#define TIMEOUT 1
+#define TIMEOUT_LONG 10
+#define MAXERRORS 10
+
+#define read_fd STDIN_FILENO
+#define write_fd STDOUT_FILENO
+
+static int read_byte(unsigned timeout)
+{
+ char buf[1];
+ int n;
+
+ alarm(timeout);
+ /* NOT safe_read! We want ALRM to interrupt us */
+ n = read(read_fd, buf, 1);
+ alarm(0);
+ if (n == 1)
+ return (unsigned char)buf[0];
+ return -1;
+}
+
+static int receive(/*int read_fd, */int file_fd)
+{
+ unsigned char blockBuf[1024];
+ unsigned errors = 0;
+ unsigned wantBlockNo = 1;
+ unsigned length = 0;
+ int do_crc = 1;
+ char nak = 'C';
+ unsigned timeout = TIMEOUT_LONG;
+
+ /* Flush pending input */
+ tcflush(read_fd, TCIFLUSH);
+
+ /* Ask for CRC; if we get errors, we will go with checksum */
+ full_write(write_fd, &nak, 1);
+
+ for (;;) {
+ int blockBegin;
+ int blockNo, blockNoOnesCompl;
+ int blockLength;
+ int cksum_crc; /* cksum OR crc */
+ int expected;
+ int i,j;
+
+ blockBegin = read_byte(timeout);
+ if (blockBegin < 0)
+ goto timeout;
+
+ timeout = TIMEOUT;
+ nak = NAK;
+
+ switch (blockBegin) {
+ case SOH:
+ case STX:
+ break;
+
+ case EOT:
+ nak = ACK;
+ full_write(write_fd, &nak, 1);
+ return length;
+
+ default:
+ goto error;
+ }
+
+ /* block no */
+ blockNo = read_byte(TIMEOUT);
+ if (blockNo < 0)
+ goto timeout;
+
+ /* block no one's compliment */
+ blockNoOnesCompl = read_byte(TIMEOUT);
+ if (blockNoOnesCompl < 0)
+ goto timeout;
+
+ if (blockNo != (255 - blockNoOnesCompl)) {
+ bb_error_msg("bad block ones compl");
+ goto error;
+ }
+
+ blockLength = (blockBegin == SOH) ? 128 : 1024;
+
+ for (i = 0; i < blockLength; i++) {
+ int cc = read_byte(TIMEOUT);
+ if (cc < 0)
+ goto timeout;
+ blockBuf[i] = cc;
+ }
+
+ if (do_crc) {
+ cksum_crc = read_byte(TIMEOUT);
+ if (cksum_crc < 0)
+ goto timeout;
+ cksum_crc = (cksum_crc << 8) | read_byte(TIMEOUT);
+ if (cksum_crc < 0)
+ goto timeout;
+ } else {
+ cksum_crc = read_byte(TIMEOUT);
+ if (cksum_crc < 0)
+ goto timeout;
+ }
+
+ if (blockNo == ((wantBlockNo - 1) & 0xff)) {
+ /* a repeat of the last block is ok, just ignore it. */
+ /* this also ignores the initial block 0 which is */
+ /* meta data. */
+ goto next;
+ }
+ if (blockNo != (wantBlockNo & 0xff)) {
+ bb_error_msg("unexpected block no, 0x%08x, expecting 0x%08x", blockNo, wantBlockNo);
+ goto error;
+ }
+
+ expected = 0;
+ if (do_crc) {
+ for (i = 0; i < blockLength; i++) {
+ expected = expected ^ blockBuf[i] << 8;
+ for (j = 0; j < 8; j++) {
+ if (expected & 0x8000)
+ expected = expected << 1 ^ 0x1021;
+ else
+ expected = expected << 1;
+ }
+ }
+ expected &= 0xffff;
+ } else {
+ for (i = 0; i < blockLength; i++)
+ expected += blockBuf[i];
+ expected &= 0xff;
+ }
+ if (cksum_crc != expected) {
+ bb_error_msg(do_crc ? "crc error, expected 0x%04x, got 0x%04x"
+ : "checksum error, expected 0x%02x, got 0x%02x",
+ expected, cksum_crc);
+ goto error;
+ }
+
+ wantBlockNo++;
+ length += blockLength;
+
+ errno = 0;
+ if (full_write(file_fd, blockBuf, blockLength) != blockLength) {
+ bb_perror_msg("can't write to file");
+ goto fatal;
+ }
+ next:
+ errors = 0;
+ nak = ACK;
+ full_write(write_fd, &nak, 1);
+ continue;
+ error:
+ timeout:
+ errors++;
+ if (errors == MAXERRORS) {
+ /* Abort */
+
+ /* if were asking for crc, try again w/o crc */
+ if (nak == 'C') {
+ nak = NAK;
+ errors = 0;
+ do_crc = 0;
+ goto timeout;
+ }
+ bb_error_msg("too many errors; giving up");
+ fatal:
+ /* 5 CAN followed by 5 BS. Don't try too hard... */
+ safe_write(write_fd, "\030\030\030\030\030\010\010\010\010\010", 10);
+ return -1;
+ }
+
+ /* Flush pending input */
+ tcflush(read_fd, TCIFLUSH);
+
+ full_write(write_fd, &nak, 1);
+ } /* for (;;) */
+}
+
+static void sigalrm_handler(int UNUSED_PARAM signum)
+{
+}
+
+int rx_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int rx_main(int argc, char **argv)
+{
+ struct termios tty, orig_tty;
+ int termios_err;
+ int file_fd;
+ int n;
+
+ if (argc != 2)
+ bb_show_usage();
+
+ /* Disabled by vda:
+ * why we can't receive from stdin? Why we *require*
+ * controlling tty?? */
+ /*read_fd = xopen(CURRENT_TTY, O_RDWR);*/
+ file_fd = xopen(argv[1], O_RDWR|O_CREAT|O_TRUNC);
+
+ termios_err = tcgetattr(read_fd, &tty);
+ if (termios_err == 0) {
+ orig_tty = tty;
+ cfmakeraw(&tty);
+ tcsetattr(read_fd, TCSAFLUSH, &tty);
+ }
+
+ /* No SA_RESTART: we want ALRM to interrupt read() */
+ signal_no_SA_RESTART_empty_mask(SIGALRM, sigalrm_handler);
+
+ n = receive(file_fd);
+
+ if (termios_err == 0)
+ tcsetattr(read_fd, TCSAFLUSH, &orig_tty);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(file_fd);
+ fflush_stdout_and_exit(n >= 0);
+}