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#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include "sg_lib.h"
#include "sg_cmds.h"
/* A utility program for the Linux OS SCSI subsystem.
* Copyright (C) 2004-2006 D. Gilbert
* 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, or (at your option)
* any later version.
This program issues the SCSI command READ LONG to a given SCSI device.
It sends the command with the logical block address passed as the lba
argument, and the transfer length set to the xfer_len argument. the
buffer to be writen to the device filled with 0xff, this buffer includes
the sector data and the ECC bytes.
*/
static char * version_str = "1.07 20060106";
#define MAX_XFER_LEN 10000
#define ME "sg_read_long: "
#define EBUFF_SZ 256
static struct option long_options[] = {
{"correct", 0, 0, 'c'},
{"help", 0, 0, 'h'},
{"lba", 1, 0, 'l'},
{"out", 1, 0, 'o'},
{"verbose", 0, 0, 'v'},
{"version", 0, 0, 'V'},
{"xfer_len", 1, 0, 'x'},
{0, 0, 0, 0},
};
static void usage()
{
fprintf(stderr, "Usage: "
"sg_read_long [--correct] [--help] [--lba=<num>] [--out=<name>]\n"
" [--verbose] [--version] [--xfer_len=<num>]"
" <scsi_device>\n"
" where: --correct|-c use ECC to correct data "
"(default: don't)\n"
" --help|-h print out usage message\n"
" --lba=<num>|-l <num> logical block address"
" (default 0)\n"
" --out=<name>|-o <name> output to file <name>\n"
" --verbose|-v increase verbosity\n"
" --version|-V print version string and"
" exit\n"
" --xfer_len=<num>|-x <num> transfer length (< 10000)"
" default 520\n\n"
"Perform a READ LONG SCSI command\n"
);
}
/* Returns 0 if successful, else -1 */
static int process_read_long(int sg_fd, int correct, unsigned long lba,
void * data_out, int xfer_len, int verbose)
{
int offset, res;
res = sg_ll_read_long10(sg_fd, correct, lba, data_out, xfer_len,
&offset, 1, verbose);
switch (res) {
case 0:
return 0;
case SG_LIB_CAT_INVALID_OP:
fprintf(stderr, " SCSI READ LONG (10) command not supported\n");
return -1;
case SG_LIB_CAT_ILLEGAL_REQ:
fprintf(stderr, " SCSI READ LONG (10) command, bad field in cdb\n");
return -1;
case SG_LIB_CAT_ILLEGAL_REQ_WITH_INFO:
fprintf(stderr, "<<< device indicates 'xfer_len' should be %d "
">>>\n", xfer_len - offset);
return -1;
default:
fprintf(stderr, " SCSI READ LONG (10) command error\n");
return -1;
}
}
int main(int argc, char * argv[])
{
int sg_fd, outfd, res, c;
unsigned char * readLongBuff = NULL;
void * rawp = NULL;
int correct = 0;
int xfer_len = 520;
unsigned int lba = 0;
int verbose = 0;
int got_stdout;
char device_name[256];
char out_fname[256];
char ebuff[EBUFF_SZ];
int ret = 1;
memset(device_name, 0, sizeof device_name);
memset(out_fname, 0, sizeof out_fname);
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "chl:o:vVx:", long_options,
&option_index);
if (c == -1)
break;
switch (c) {
case 'c':
correct = 1;
break;
case 'h':
case '?':
usage();
return 0;
case 'l':
lba = sg_get_num(optarg);
if ((unsigned int)(-1) == lba) {
fprintf(stderr, "bad argument to '--lba'\n");
return 1;
}
break;
case 'o':
strncpy(out_fname, optarg, sizeof(out_fname));
break;
case 'v':
++verbose;
break;
case 'V':
fprintf(stderr, ME "version: %s\n", version_str);
return 0;
case 'x':
xfer_len = sg_get_num(optarg);
if (-1 == xfer_len) {
fprintf(stderr, "bad argument to '--xfer_len'\n");
return 1;
}
break;
default:
fprintf(stderr, "unrecognised switch code 0x%x ??\n", c);
usage();
return 1;
}
}
if (optind < argc) {
if ('\0' == device_name[0]) {
strncpy(device_name, argv[optind], sizeof(device_name) - 1);
device_name[sizeof(device_name) - 1] = '\0';
++optind;
}
if (optind < argc) {
for (; optind < argc; ++optind)
fprintf(stderr, "Unexpected extra argument: %s\n",
argv[optind]);
usage();
return 1;
}
}
if (0 == device_name[0]) {
fprintf(stderr, "missing device name!\n");
usage();
return 1;
}
if (xfer_len >= MAX_XFER_LEN){
fprintf(stderr, "xfer_len (%d) is out of range ( < %d)\n",
xfer_len, MAX_XFER_LEN);
usage();
return 1;
}
sg_fd = sg_cmds_open_device(device_name, 0 /* rw */, verbose);
if (sg_fd < 0) {
fprintf(stderr, ME "open error: %s: %s\n", device_name,
safe_strerror(-sg_fd));
return 1;
}
if (NULL == (rawp = malloc(MAX_XFER_LEN))) {
fprintf(stderr, ME "out of memory (query)\n");
sg_cmds_close_device(sg_fd);
return 1;
}
readLongBuff = rawp;
memset(rawp, 0x0, MAX_XFER_LEN);
fprintf(stderr, ME "issue read long (10) to device %s\n\t\txfer_len=%d "
"(0x%x), lba=%d (0x%x), correct=%d\n", device_name, xfer_len,
xfer_len, lba, lba, correct);
if (process_read_long(sg_fd, correct, lba, readLongBuff, xfer_len,
verbose))
goto err_out;
if ('\0' == out_fname[0])
dStrHex(rawp, xfer_len, 0);
else {
got_stdout = (0 == strcmp(out_fname, "-")) ? 1 : 0;
if (got_stdout)
outfd = 1;
else {
if ((outfd = open(out_fname, O_WRONLY | O_CREAT | O_TRUNC,
0666)) < 0) {
snprintf(ebuff, EBUFF_SZ,
ME "could not open %s for writing", out_fname);
perror(ebuff);
goto err_out;
}
}
res = write(outfd, readLongBuff, xfer_len);
if (res < 0) {
snprintf(ebuff, EBUFF_SZ, ME "couldn't write to %s", out_fname);
perror(ebuff);
goto err_out;
}
if (! got_stdout)
close(outfd);
}
ret = 0;
err_out:
if (rawp) free(rawp);
res = sg_cmds_close_device(sg_fd);
if (res < 0) {
fprintf(stderr, ME "close error: %s\n", safe_strerror(-res));
return 1;
}
return ret;
}
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