diff options
Diffstat (limited to 'miscutils')
| -rw-r--r-- | miscutils/Config.in | 6 | ||||
| -rw-r--r-- | miscutils/Makefile.in | 1 | ||||
| -rw-r--r-- | miscutils/rx.c | 344 |
3 files changed, 351 insertions, 0 deletions
diff --git a/miscutils/Config.in b/miscutils/Config.in index 4216b28..c5327c2 100644 --- a/miscutils/Config.in +++ b/miscutils/Config.in @@ -156,6 +156,12 @@ config CONFIG_MT to advance or rewind a tape past a specified number of archive files on the tape. +config CONFIG_RX + bool "rx" + default n + help + Receive files using the Xmodem protocol. + config CONFIG_STRINGS bool "strings" default n diff --git a/miscutils/Makefile.in b/miscutils/Makefile.in index 773f558..fea9b89 100644 --- a/miscutils/Makefile.in +++ b/miscutils/Makefile.in @@ -33,6 +33,7 @@ MISCUTILS-$(CONFIG_HDPARM) += hdparm.o MISCUTILS-$(CONFIG_LAST) += last.o MISCUTILS-$(CONFIG_MAKEDEVS) += makedevs.o MISCUTILS-$(CONFIG_MT) += mt.o +MISCUTILS-$(CONFIG_RX) += rx.o MISCUTILS-$(CONFIG_STRINGS) += strings.o MISCUTILS-$(CONFIG_TIME) += time.o MISCUTILS-$(CONFIG_WATCHDOG) += watchdog.o diff --git a/miscutils/rx.c b/miscutils/rx.c new file mode 100644 index 0000000..2b16f2e --- /dev/null +++ b/miscutils/rx.c @@ -0,0 +1,344 @@ +/*------------------------------------------------------------------------- + * Filename: xmodem.c + * Version: $Id: rx.c,v 1.1 2003/12/20 07:30:35 bug1 Exp $ + * 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 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * + * This was originally written for blob and then adapted for busybox. + * + */ + +#include <stdlib.h> +#include <stdarg.h> +#include <stdio.h> +#include <unistd.h> +#include <errno.h> +#include <termios.h> +#include <signal.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <string.h> +#include "busybox.h" + + +#define SOH 0x01 +#define STX 0x02 +#define EOT 0x04 +#define ACK 0x06 +#define NAK 0x15 +#define CAN 0x18 +#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 + +static inline void write_byte(int fd, char cc) { + write(fd, &cc, 1); +} + +static inline void write_flush(int fd) { + tcdrain(fd); +} + +static inline void read_flush(int fd) { + tcflush(fd, TCIFLUSH); +} + +static int read_byte(int fd, unsigned int timeout) { + char buf[1]; + int n; + + alarm(timeout); + + n = read(fd, &buf, 1); + + alarm(0); + + if (n == 1) + return buf[0] & 0xff; + else + return -1; +} + +static int receive(char *error_buf, size_t error_buf_size, + int ttyfd, int filefd) +{ + char blockBuf[1024]; + unsigned int errors = 0; + unsigned int wantBlockNo = 1; + unsigned int length = 0; + int docrc = 1; + char nak = 'C'; + unsigned int timeout = TIMEOUT_LONG; + +#define note_error(fmt,args...) \ + snprintf(error_buf, error_buf_size, fmt,##args) + + read_flush(ttyfd); + + /* Ask for CRC; if we get errors, we will go with checksum */ + write_byte(ttyfd, nak); + write_flush(ttyfd); + + for (;;) { + int blockBegin; + int blockNo, blockNoOnesCompl; + int blockLength; + int cksum = 0; + int crcHi = 0; + int crcLo = 0; + + blockBegin = read_byte(ttyfd, timeout); + if (blockBegin < 0) + goto timeout; + + timeout = TIMEOUT; + nak = NAK; + + switch (blockBegin) { + case SOH: + case STX: + break; + + case EOT: + write_byte(ttyfd, ACK); + write_flush(ttyfd); + goto done; + + default: + goto error; + } + + /* block no */ + blockNo = read_byte(ttyfd, TIMEOUT); + if (blockNo < 0) + goto timeout; + + /* block no one's compliment */ + blockNoOnesCompl = read_byte(ttyfd, TIMEOUT); + if (blockNoOnesCompl < 0) + goto timeout; + + if (blockNo != (255 - blockNoOnesCompl)) { + note_error("bad block ones compl"); + goto error; + } + + blockLength = (blockBegin == SOH) ? 128 : 1024; + + { + int i; + + for (i = 0; i < blockLength; i++) { + int cc = read_byte(ttyfd, TIMEOUT); + if (cc < 0) + goto timeout; + blockBuf[i] = cc; + } + } + + if (docrc) { + crcHi = read_byte(ttyfd, TIMEOUT); + if (crcHi < 0) + goto timeout; + + crcLo = read_byte(ttyfd, TIMEOUT); + if (crcLo < 0) + goto timeout; + } else { + cksum = read_byte(ttyfd, TIMEOUT); + if (cksum < 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; + } else if (blockNo != (wantBlockNo & 0xff)) { + note_error("unexpected block no, 0x%08x, expecting 0x%08x", blockNo, wantBlockNo); + goto error; + } + + if (docrc) { + int crc = 0; + int i, j; + int expectedCrcHi; + int expectedCrcLo; + + for (i = 0; i < blockLength; i++) { + crc = crc ^ (int) blockBuf[i] << 8; + for (j = 0; j < 8; j++) + if (crc & 0x8000) + crc = crc << 1 ^ 0x1021; + else + crc = crc << 1; + } + + expectedCrcHi = (crc >> 8) & 0xff; + expectedCrcLo = crc & 0xff; + + if ((crcHi != expectedCrcHi) || + (crcLo != expectedCrcLo)) { + note_error("crc error, expected 0x%02x 0x%02x, got 0x%02x 0x%02x", expectedCrcHi, expectedCrcLo, crcHi, crcLo); + goto error; + } + } else { + unsigned char expectedCksum = 0; + int i; + + for (i = 0; i < blockLength; i++) + expectedCksum += blockBuf[i]; + + if (cksum != expectedCksum) { + note_error("checksum error, expected 0x%02x, got 0x%02x", expectedCksum, cksum); + goto error; + } + } + + wantBlockNo++; + length += blockLength; + + if (bb_full_write(filefd, blockBuf, blockLength) < 0) { + note_error("write to file failed: %m"); + goto fatal; + } + + next: + errors = 0; + write_byte(ttyfd, ACK); + write_flush(ttyfd); + continue; + + error: + timeout: + errors++; + if (errors == MAXERRORS) { + /* Abort */ + int i; + + // if using crc, try again w/o crc + if (nak == 'C') { + nak = NAK; + errors = 0; + docrc = 0; + goto timeout; + } + + note_error("too many errors; giving up"); + + fatal: + for (i = 0; i < 5; i ++) + write_byte(ttyfd, CAN); + for (i = 0; i < 5; i ++) + write_byte(ttyfd, BS); + write_flush(ttyfd); + return -1; + } + + read_flush(ttyfd); + write_byte(ttyfd, nak); + write_flush(ttyfd); + } + + done: + return length; + +#undef note_error +} + +static void sigalrm_handler(int signum) +{ +} + +int rx_main(int argc, char **argv) +{ + char *fn; + int ttyfd, filefd; + struct termios tty, orig_tty; + struct sigaction act; + int n; + char error_buf[256]; + + if (argc != 2) + bb_show_usage(); + + fn = argv[1]; + ttyfd = open("/dev/tty", O_RDWR); + if (ttyfd < 0) + bb_error_msg_and_die("%s: open on /dev/tty failed: %m\n", argv[0]); + + filefd = open(fn, O_RDWR|O_CREAT|O_TRUNC, 0666); + if (filefd < 0) + bb_error_msg_and_die("%s: open on %s failed: %m\n", argv[0], fn); + + if (tcgetattr(ttyfd, &tty) < 0) + bb_error_msg_and_die("%s: tcgetattr failed: %m\n", argv[0]); + + orig_tty = tty; + + cfmakeraw(&tty); + tcsetattr(ttyfd, TCSAFLUSH, &tty); + + memset(&act, 0, sizeof(act)); + act.sa_handler = sigalrm_handler; + sigaction(SIGALRM, &act, 0); + + n = receive(error_buf, sizeof(error_buf), ttyfd, filefd); + + close(filefd); + + tcsetattr(ttyfd, TCSAFLUSH, &orig_tty); + + if (n < 0) + bb_error_msg_and_die("\n%s: receive failed:\n %s\n", + argv[0], error_buf); + + bb_fflush_stdout_and_exit(EXIT_SUCCESS); +} + +/* +Local Variables: +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |