2357dac430
- Add missing va_end's after corresponding va_start's to cleanup state
- Eliminate questionable bzero'ing of va_list passed in to
do_buff_decode(..) and do_encode(..) from buff_{de,en}code_visit(..)
and csio_{de,en}code_visit(..). Make va_list a pointer instead and
pass NULL into the underlying functions to handler this in a portable
way.
- Do some minor style(9) clean up in affected functions.
Differential Revision: https://reviews.freebsd.org/D6072
MFC after: 3 days
Reported by: cppcheck, Coverity
CID: 1018500-1018503
Reviewed by: cem
Sponsored by: EMC / Isilon Storage Division
853 lines
17 KiB
C
853 lines
17 KiB
C
/*
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* Taken from the original FreeBSD user SCSI library.
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*/
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/* Copyright (c) 1994 HD Associates
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* (contact: dufault@hda.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by HD Associates
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* 4. Neither the name of the HD Associaates nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* From: scsi.c,v 1.8 1997/02/22 15:07:54 peter Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <sys/errno.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#include <cam/cam.h>
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#include <cam/cam_ccb.h>
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#include <cam/scsi/scsi_message.h>
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#include "camlib.h"
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/*
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* Decode: Decode the data section of a scsireq. This decodes
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* trivial grammar:
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*
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* fields : field fields
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* ;
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*
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* field : field_specifier
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* | control
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* ;
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*
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* control : 's' seek_value
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* | 's' '+' seek_value
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* ;
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*
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* seek_value : DECIMAL_NUMBER
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* | 'v' // For indirect seek, i.e., value from the arg list
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* ;
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*
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* field_specifier : type_specifier field_width
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* | '{' NAME '}' type_specifier field_width
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* ;
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*
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* field_width : DECIMAL_NUMBER
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* ;
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*
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* type_specifier : 'i' // Integral types (i1, i2, i3, i4)
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* | 'b' // Bits
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* | 't' // Bits
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* | 'c' // Character arrays
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* | 'z' // Character arrays with zeroed trailing spaces
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* ;
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*
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* Notes:
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* 1. Integral types are swapped into host order.
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* 2. Bit fields are allocated MSB to LSB to match the SCSI spec documentation.
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* 3. 's' permits "seeking" in the string. "s+DECIMAL" seeks relative to
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* DECIMAL; "sDECIMAL" seeks absolute to decimal.
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* 4. 's' permits an indirect reference. "sv" or "s+v" will get the
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* next integer value from the arg array.
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* 5. Field names can be anything between the braces
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*
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* BUGS:
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* i and b types are promoted to ints.
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*
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*/
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static int
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do_buff_decode(u_int8_t *databuf, size_t len,
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void (*arg_put)(void *, int , void *, int, char *),
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void *puthook, const char *fmt, va_list *ap)
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{
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int assigned = 0;
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int width;
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int suppress;
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int plus;
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int done = 0;
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static u_char mask[] = {0, 0x01, 0x03, 0x07, 0x0f,
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0x1f, 0x3f, 0x7f, 0xff};
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int value;
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u_char *base = databuf;
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char *intendp;
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char letter;
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char field_name[80];
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# define ARG_PUT(ARG) \
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do \
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{ \
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if (!suppress) \
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{ \
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if (arg_put) \
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(*arg_put)(puthook, (letter == 't' ? \
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'b' : letter), \
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(void *)((long)(ARG)), width, \
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field_name); \
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else \
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*(va_arg(*ap, int *)) = (ARG); \
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assigned++; \
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} \
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field_name[0] = 0; \
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suppress = 0; \
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} while (0)
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u_char bits = 0; /* For bit fields */
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int shift = 0; /* Bits already shifted out */
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suppress = 0;
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field_name[0] = 0;
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while (!done) {
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switch(letter = *fmt) {
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case ' ': /* White space */
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case '\t':
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case '\r':
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case '\n':
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case '\f':
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fmt++;
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break;
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case '#': /* Comment */
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while (*fmt && (*fmt != '\n'))
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fmt++;
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if (fmt)
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fmt++; /* Skip '\n' */
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break;
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case '*': /* Suppress assignment */
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fmt++;
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suppress = 1;
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break;
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case '{': /* Field Name */
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{
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int i = 0;
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fmt++; /* Skip '{' */
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while (*fmt && (*fmt != '}')) {
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if (i < sizeof(field_name))
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field_name[i++] = *fmt;
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fmt++;
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}
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if (fmt)
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fmt++; /* Skip '}' */
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field_name[i] = 0;
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break;
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}
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case 't': /* Bit (field) */
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case 'b': /* Bits */
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fmt++;
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width = strtol(fmt, &intendp, 10);
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fmt = intendp;
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if (width > 8)
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done = 1;
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else {
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if (shift <= 0) {
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bits = *databuf++;
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shift = 8;
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}
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value = (bits >> (shift - width)) &
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mask[width];
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#if 0
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printf("shift %2d bits %02x value %02x width %2d mask %02x\n",
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shift, bits, value, width, mask[width]);
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#endif
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ARG_PUT(value);
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shift -= width;
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}
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break;
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case 'i': /* Integral values */
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shift = 0;
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fmt++;
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width = strtol(fmt, &intendp, 10);
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fmt = intendp;
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switch(width) {
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case 1:
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ARG_PUT(*databuf);
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databuf++;
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break;
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case 2:
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ARG_PUT((*databuf) << 8 | *(databuf + 1));
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databuf += 2;
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break;
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case 3:
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ARG_PUT((*databuf) << 16 |
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(*(databuf + 1)) << 8 | *(databuf + 2));
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databuf += 3;
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break;
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case 4:
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ARG_PUT((*databuf) << 24 |
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(*(databuf + 1)) << 16 |
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(*(databuf + 2)) << 8 |
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*(databuf + 3));
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databuf += 4;
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break;
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default:
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done = 1;
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break;
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}
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break;
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case 'c': /* Characters (i.e., not swapped) */
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case 'z': /* Characters with zeroed trailing
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spaces */
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shift = 0;
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fmt++;
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width = strtol(fmt, &intendp, 10);
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fmt = intendp;
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if (!suppress) {
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if (arg_put)
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(*arg_put)(puthook,
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(letter == 't' ? 'b' : letter),
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databuf, width, field_name);
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else {
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char *dest;
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dest = va_arg(*ap, char *);
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bcopy(databuf, dest, width);
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if (letter == 'z') {
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char *p;
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for (p = dest + width - 1;
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(p >= (char *)dest)
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&& (*p == ' '); p--)
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*p = 0;
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}
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}
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assigned++;
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}
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databuf += width;
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field_name[0] = 0;
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suppress = 0;
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break;
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case 's': /* Seek */
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shift = 0;
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fmt++;
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if (*fmt == '+') {
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plus = 1;
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fmt++;
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} else
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plus = 0;
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if (tolower(*fmt) == 'v') {
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/*
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* You can't suppress a seek value. You also
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* can't have a variable seek when you are using
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* "arg_put".
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*/
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width = (arg_put) ? 0 : va_arg(*ap, int);
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fmt++;
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} else {
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width = strtol(fmt, &intendp, 10);
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fmt = intendp;
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}
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if (plus)
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databuf += width; /* Relative seek */
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else
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databuf = base + width; /* Absolute seek */
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break;
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case 0:
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done = 1;
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break;
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default:
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fprintf(stderr, "Unknown letter in format: %c\n",
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letter);
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fmt++;
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break;
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}
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}
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return (assigned);
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}
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/* next_field: Return the next field in a command specifier. This
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* builds up a SCSI command using this trivial grammar:
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*
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* fields : field fields
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* ;
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*
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* field : value
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* | value ':' field_width
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* ;
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*
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* field_width : digit
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* | 'i' digit // i2 = 2 byte integer, i3 = 3 byte integer etc.
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* ;
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*
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* value : HEX_NUMBER
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* | 'v' // For indirection.
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* ;
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*
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* Notes:
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* Bit fields are specified MSB first to match the SCSI spec.
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*
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* Examples:
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* TUR: "0 0 0 0 0 0"
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* WRITE BUFFER: "38 v:3 0:2 0:3 v v:i3 v:i3 0", mode, buffer_id, list_length
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*
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* The function returns the value:
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* 0: For reached end, with error_p set if an error was found
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* 1: For valid stuff setup
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* 2: For "v" was entered as the value (implies use varargs)
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*
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*/
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static int
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next_field(const char **pp, char *fmt, int *width_p, int *value_p, char *name,
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int n_name, int *error_p, int *suppress_p)
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{
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const char *p = *pp;
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char *intendp;
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int something = 0;
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enum {
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BETWEEN_FIELDS,
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START_FIELD,
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GET_FIELD,
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DONE,
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} state;
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int value = 0;
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int field_size; /* Default to byte field type... */
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int field_width; /* 1 byte wide */
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int is_error = 0;
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int suppress = 0;
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field_size = 8; /* Default to byte field type... */
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*fmt = 'i';
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field_width = 1; /* 1 byte wide */
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if (name)
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*name = 0;
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state = BETWEEN_FIELDS;
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while (state != DONE) {
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switch(state) {
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case BETWEEN_FIELDS:
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if (*p == 0)
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state = DONE;
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else if (isspace(*p))
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p++;
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else if (*p == '#') {
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while (*p && *p != '\n')
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p++;
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if (p)
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p++;
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} else if (*p == '{') {
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int i = 0;
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p++;
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while (*p && *p != '}') {
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if(name && i < n_name) {
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name[i] = *p;
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i++;
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}
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p++;
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}
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if(name && i < n_name)
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name[i] = 0;
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if (*p == '}')
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p++;
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} else if (*p == '*') {
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p++;
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suppress = 1;
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} else if (isxdigit(*p)) {
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something = 1;
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value = strtol(p, &intendp, 16);
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p = intendp;
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state = START_FIELD;
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} else if (tolower(*p) == 'v') {
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p++;
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something = 2;
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value = *value_p;
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state = START_FIELD;
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} else if (tolower(*p) == 'i') {
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/*
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* Try to work without the "v".
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*/
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something = 2;
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value = *value_p;
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p++;
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*fmt = 'i';
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field_size = 8;
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field_width = strtol(p, &intendp, 10);
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p = intendp;
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state = DONE;
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} else if (tolower(*p) == 't') {
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/*
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* XXX: B can't work: Sees the 'b' as a
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* hex digit in "isxdigit". try "t" for
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* bit field.
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*/
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something = 2;
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value = *value_p;
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p++;
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*fmt = 'b';
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field_size = 1;
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field_width = strtol(p, &intendp, 10);
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p = intendp;
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state = DONE;
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} else if (tolower(*p) == 's') {
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/* Seek */
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*fmt = 's';
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p++;
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if (tolower(*p) == 'v') {
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p++;
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something = 2;
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value = *value_p;
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} else {
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something = 1;
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value = strtol(p, &intendp, 0);
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p = intendp;
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}
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state = DONE;
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} else {
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fprintf(stderr, "Invalid starting "
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"character: %c\n", *p);
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is_error = 1;
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state = DONE;
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}
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break;
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|
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case START_FIELD:
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if (*p == ':') {
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p++;
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field_size = 1; /* Default to bits
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when specified */
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state = GET_FIELD;
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} else
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state = DONE;
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break;
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|
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case GET_FIELD:
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if (isdigit(*p)) {
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*fmt = 'b';
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field_size = 1;
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field_width = strtol(p, &intendp, 10);
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p = intendp;
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state = DONE;
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} else if (*p == 'i') {
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|
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/* Integral (bytes) */
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p++;
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*fmt = 'i';
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field_size = 8;
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field_width = strtol(p, &intendp, 10);
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p = intendp;
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state = DONE;
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} else if (*p == 'b') {
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|
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/* Bits */
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p++;
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*fmt = 'b';
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field_size = 1;
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field_width = strtol(p, &intendp, 10);
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p = intendp;
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state = DONE;
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} else {
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fprintf(stderr, "Invalid startfield %c "
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|
"(%02x)\n", *p, *p);
|
|
is_error = 1;
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state = DONE;
|
|
}
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break;
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|
|
case DONE:
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|
break;
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}
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}
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|
|
if (is_error) {
|
|
*error_p = 1;
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|
return 0;
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|
}
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|
|
*error_p = 0;
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|
*pp = p;
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|
*width_p = field_width * field_size;
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|
*value_p = value;
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|
*suppress_p = suppress;
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|
return (something);
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|
}
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|
|
static int
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|
do_encode(u_char *buff, size_t vec_max, size_t *used,
|
|
int (*arg_get)(void *, char *), void *gethook, const char *fmt,
|
|
va_list *ap)
|
|
{
|
|
int ind;
|
|
int shift;
|
|
u_char val;
|
|
int ret;
|
|
int width, value, error, suppress;
|
|
char c;
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|
int encoded = 0;
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|
char field_name[80];
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|
ind = 0;
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|
shift = 0;
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|
val = 0;
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|
|
while ((ret = next_field(&fmt, &c, &width, &value, field_name,
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|
sizeof(field_name), &error, &suppress))) {
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|
encoded++;
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|
|
if (ret == 2) {
|
|
if (suppress)
|
|
value = 0;
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|
else
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|
value = arg_get ?
|
|
(*arg_get)(gethook, field_name) :
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|
va_arg(*ap, int);
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|
}
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|
|
#if 0
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|
printf(
|
|
"do_encode: ret %d fmt %c width %d value %d name \"%s\" error %d suppress %d\n",
|
|
ret, c, width, value, field_name, error, suppress);
|
|
#endif
|
|
/* Absolute seek */
|
|
if (c == 's') {
|
|
ind = value;
|
|
continue;
|
|
}
|
|
|
|
/* A width of < 8 is a bit field. */
|
|
if (width < 8) {
|
|
|
|
/* This is a bit field. We start with the high bits
|
|
* so it reads the same as the SCSI spec.
|
|
*/
|
|
|
|
shift += width;
|
|
|
|
val |= (value << (8 - shift));
|
|
|
|
if (shift == 8) {
|
|
if (ind < vec_max) {
|
|
buff[ind++] = val;
|
|
val = 0;
|
|
}
|
|
shift = 0;
|
|
}
|
|
} else {
|
|
if (shift) {
|
|
if (ind < vec_max) {
|
|
buff[ind++] = val;
|
|
val = 0;
|
|
}
|
|
shift = 0;
|
|
}
|
|
switch(width) {
|
|
case 8: /* 1 byte integer */
|
|
if (ind < vec_max)
|
|
buff[ind++] = value;
|
|
break;
|
|
|
|
case 16: /* 2 byte integer */
|
|
if (ind < vec_max - 2 + 1) {
|
|
buff[ind++] = value >> 8;
|
|
buff[ind++] = value;
|
|
}
|
|
break;
|
|
|
|
case 24: /* 3 byte integer */
|
|
if (ind < vec_max - 3 + 1) {
|
|
buff[ind++] = value >> 16;
|
|
buff[ind++] = value >> 8;
|
|
buff[ind++] = value;
|
|
}
|
|
break;
|
|
|
|
case 32: /* 4 byte integer */
|
|
if (ind < vec_max - 4 + 1) {
|
|
buff[ind++] = value >> 24;
|
|
buff[ind++] = value >> 16;
|
|
buff[ind++] = value >> 8;
|
|
buff[ind++] = value;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "do_encode: Illegal width\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Flush out any remaining bits
|
|
*/
|
|
if (shift && ind < vec_max) {
|
|
buff[ind++] = val;
|
|
val = 0;
|
|
}
|
|
|
|
|
|
if (used)
|
|
*used = ind;
|
|
|
|
if (error)
|
|
return -1;
|
|
|
|
return encoded;
|
|
}
|
|
|
|
int
|
|
csio_decode(struct ccb_scsiio *csio, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int retval;
|
|
|
|
va_start(ap, fmt);
|
|
|
|
retval = do_buff_decode(csio->data_ptr, (size_t)csio->dxfer_len, 0, 0,
|
|
fmt, &ap);
|
|
|
|
va_end(ap);
|
|
|
|
return (retval);
|
|
}
|
|
|
|
int
|
|
csio_decode_visit(struct ccb_scsiio *csio, const char *fmt,
|
|
void (*arg_put)(void *, int, void *, int, char *),
|
|
void *puthook)
|
|
{
|
|
|
|
/*
|
|
* We need some way to output things; we can't do it without
|
|
* the arg_put function.
|
|
*/
|
|
if (arg_put == NULL)
|
|
return (-1);
|
|
|
|
return (do_buff_decode(csio->data_ptr, (size_t)csio->dxfer_len,
|
|
arg_put, puthook, fmt, NULL));
|
|
}
|
|
|
|
int
|
|
buff_decode(u_int8_t *buff, size_t len, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int retval;
|
|
|
|
va_start(ap, fmt);
|
|
|
|
retval = do_buff_decode(buff, len, 0, 0, fmt, &ap);
|
|
|
|
va_end(ap);
|
|
|
|
return (retval);
|
|
}
|
|
|
|
int
|
|
buff_decode_visit(u_int8_t *buff, size_t len, const char *fmt,
|
|
void (*arg_put)(void *, int, void *, int, char *),
|
|
void *puthook)
|
|
{
|
|
|
|
/*
|
|
* We need some way to output things; we can't do it without
|
|
* the arg_put function.
|
|
*/
|
|
if (arg_put == NULL)
|
|
return(-1);
|
|
|
|
return (do_buff_decode(buff, len, arg_put, puthook, fmt, NULL));
|
|
}
|
|
|
|
/*
|
|
* Build a SCSI CCB, given the command and data pointers and a format
|
|
* string describing the
|
|
*/
|
|
int
|
|
csio_build(struct ccb_scsiio *csio, u_int8_t *data_ptr, u_int32_t dxfer_len,
|
|
u_int32_t flags, int retry_count, int timeout, const char *cmd_spec,
|
|
...)
|
|
{
|
|
size_t cmdlen;
|
|
int retval;
|
|
va_list ap;
|
|
|
|
if (csio == NULL)
|
|
return (0);
|
|
|
|
bzero(csio, sizeof(struct ccb_scsiio));
|
|
|
|
va_start(ap, cmd_spec);
|
|
|
|
if ((retval = do_encode(csio->cdb_io.cdb_bytes, SCSI_MAX_CDBLEN,
|
|
&cmdlen, NULL, NULL, cmd_spec, &ap)) == -1)
|
|
goto done;
|
|
|
|
cam_fill_csio(csio,
|
|
/* retries */ retry_count,
|
|
/* cbfcnp */ NULL,
|
|
/* flags */ flags,
|
|
/* tag_action */ MSG_SIMPLE_Q_TAG,
|
|
/* data_ptr */ data_ptr,
|
|
/* dxfer_len */ dxfer_len,
|
|
/* sense_len */ SSD_FULL_SIZE,
|
|
/* cdb_len */ cmdlen,
|
|
/* timeout */ timeout ? timeout : 5000);
|
|
|
|
done:
|
|
va_end(ap);
|
|
|
|
return (retval);
|
|
}
|
|
|
|
int
|
|
csio_build_visit(struct ccb_scsiio *csio, u_int8_t *data_ptr,
|
|
u_int32_t dxfer_len, u_int32_t flags, int retry_count,
|
|
int timeout, const char *cmd_spec,
|
|
int (*arg_get)(void *hook, char *field_name), void *gethook)
|
|
{
|
|
size_t cmdlen;
|
|
int retval;
|
|
|
|
if (csio == NULL)
|
|
return(0);
|
|
|
|
/*
|
|
* We need something to encode, but we can't get it without the
|
|
* arg_get function.
|
|
*/
|
|
if (arg_get == NULL)
|
|
return(-1);
|
|
|
|
bzero(csio, sizeof(struct ccb_scsiio));
|
|
|
|
if ((retval = do_encode(csio->cdb_io.cdb_bytes, SCSI_MAX_CDBLEN,
|
|
&cmdlen, arg_get, gethook, cmd_spec, NULL)) == -1)
|
|
return(retval);
|
|
|
|
cam_fill_csio(csio,
|
|
/* retries */ retry_count,
|
|
/* cbfcnp */ NULL,
|
|
/* flags */ flags,
|
|
/* tag_action */ MSG_SIMPLE_Q_TAG,
|
|
/* data_ptr */ data_ptr,
|
|
/* dxfer_len */ dxfer_len,
|
|
/* sense_len */ SSD_FULL_SIZE,
|
|
/* cdb_len */ cmdlen,
|
|
/* timeout */ timeout ? timeout : 5000);
|
|
|
|
return(retval);
|
|
}
|
|
|
|
int
|
|
csio_encode(struct ccb_scsiio *csio, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int retval;
|
|
|
|
if (csio == NULL)
|
|
return (0);
|
|
|
|
va_start(ap, fmt);
|
|
|
|
retval = do_encode(csio->data_ptr, csio->dxfer_len, 0, 0, 0, fmt, &ap);
|
|
|
|
va_end(ap);
|
|
|
|
return (retval);
|
|
}
|
|
|
|
int
|
|
buff_encode_visit(u_int8_t *buff, size_t len, const char *fmt,
|
|
int (*arg_get)(void *hook, char *field_name), void *gethook)
|
|
{
|
|
|
|
/*
|
|
* We need something to encode, but we can't get it without the
|
|
* arg_get function.
|
|
*/
|
|
if (arg_get == NULL)
|
|
return(-1);
|
|
|
|
return (do_encode(buff, len, 0, arg_get, gethook, fmt, NULL));
|
|
}
|
|
|
|
int
|
|
csio_encode_visit(struct ccb_scsiio *csio, const char *fmt,
|
|
int (*arg_get)(void *hook, char *field_name), void *gethook)
|
|
{
|
|
|
|
/*
|
|
* We need something to encode, but we can't get it without the
|
|
* arg_get function.
|
|
*/
|
|
if (arg_get == NULL)
|
|
return(-1);
|
|
|
|
return (do_encode(csio->data_ptr, csio->dxfer_len, 0, arg_get,
|
|
gethook, fmt, NULL));
|
|
}
|