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1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
266 lines
6.7 KiB
C
266 lines
6.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2007 Diomidis Spinellis
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR 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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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/acct.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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int readrec_forward(FILE *f, struct acctv3 *av2);
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int readrec_backward(FILE *f, struct acctv3 *av2);
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/*
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* Reverse offsetof: return the offset of field f
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* from the end of the structure s.
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*/
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#define roffsetof(s, f) (sizeof(s) - offsetof(s, f))
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/*
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* Read exactly one record of size size from stream f into ptr.
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* Failure to read the complete record is considered a file format error,
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* and will set errno to EFTYPE.
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* Return 0 on success, EOF on end of file or error.
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*/
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static int
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fread_record(void *ptr, size_t size, FILE *f)
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{
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size_t rv;
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if ((rv = fread(ptr, 1, size, f)) == size)
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return (0);
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else if (ferror(f) || rv == 0)
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return (EOF);
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else {
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/* Short read. */
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errno = EFTYPE;
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return (EOF);
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}
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}
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/*
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* Return the value of a comp_t field.
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*/
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static float
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decode_comp(comp_t v)
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{
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int result, exp;
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result = v & 017777;
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for (exp = v >> 13; exp; exp--)
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result <<= 3;
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return ((double)result / AHZV1);
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}
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/*
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* Read a v1 accounting record stored at the current
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* position of stream f.
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* Convert the data to the current record format.
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* Return EOF on error or end-of-file.
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*/
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static int
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readrec_v1(FILE *f, struct acctv3 *av3)
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{
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struct acctv1 av1;
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int rv;
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if ((rv = fread_record(&av1, sizeof(av1), f)) == EOF)
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return (EOF);
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av3->ac_zero = 0;
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av3->ac_version = 3;
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av3->ac_len = av3->ac_len2 = sizeof(*av3);
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memcpy(av3->ac_comm, av1.ac_comm, AC_COMM_LEN);
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av3->ac_utime = decode_comp(av1.ac_utime) * 1000000;
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av3->ac_stime = decode_comp(av1.ac_stime) * 1000000;
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av3->ac_etime = decode_comp(av1.ac_etime) * 1000000;
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av3->ac_btime = av1.ac_btime;
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av3->ac_uid = av1.ac_uid;
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av3->ac_gid = av1.ac_gid;
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av3->ac_mem = av1.ac_mem;
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av3->ac_io = decode_comp(av1.ac_io);
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av3->ac_tty = av1.ac_tty;
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av3->ac_flagx = av1.ac_flag | ANVER;
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return (0);
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}
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/*
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* Read an v2 accounting record stored at the current
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* position of stream f.
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* Return EOF on error or end-of-file.
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*/
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static int
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readrec_v2(FILE *f, struct acctv3 *av3)
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{
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struct acctv2 av2;
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int rv;
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if ((rv = fread_record(&av2, sizeof(av2), f)) == EOF)
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return (EOF);
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av3->ac_zero = 0;
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av3->ac_version = 3;
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av3->ac_len = av3->ac_len2 = sizeof(*av3);
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memcpy(av3->ac_comm, av2.ac_comm, AC_COMM_LEN);
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av3->ac_utime = av2.ac_utime;
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av3->ac_stime = av2.ac_stime;
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av3->ac_etime = av2.ac_etime;
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av3->ac_btime = av2.ac_btime;
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av3->ac_uid = av2.ac_uid;
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av3->ac_gid = av2.ac_gid;
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av3->ac_mem = av2.ac_mem;
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av3->ac_io = av2.ac_io;
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av3->ac_tty = av2.ac_tty;
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av3->ac_flagx = av2.ac_flagx;
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return (0);
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}
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/*
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* Read an v2 accounting record stored at the current
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* position of stream f.
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* Return EOF on error or end-of-file.
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*/
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static int
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readrec_v3(FILE *f, struct acctv3 *av3)
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{
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return (fread_record(av3, sizeof(*av3), f));
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}
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/*
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* Read a new-style (post-v1) accounting record stored at
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* the current position of stream f.
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* Convert the data to the current record format.
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* Return EOF on error or end-of-file.
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*/
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static int
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readrec_vx(FILE *f, struct acctv3 *av3)
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{
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uint8_t magic, version;
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if (fread_record(&magic, sizeof(magic), f) == EOF ||
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fread_record(&version, sizeof(version), f) == EOF ||
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ungetc(version, f) == EOF ||
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ungetc(magic, f) == EOF)
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return (EOF);
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switch (version) {
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case 2:
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return (readrec_v2(f, av3));
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case 3:
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return (readrec_v3(f, av3));
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/* Add handling for more versions here. */
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default:
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errno = EFTYPE;
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return (EOF);
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}
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}
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/*
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* Read an accounting record stored at the current
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* position of stream f.
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* Old-format records are converted to the current record
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* format.
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* Return the number of records read (1 or 0 at the end-of-file),
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* or EOF on error.
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*/
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int
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readrec_forward(FILE *f, struct acctv3 *av3)
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{
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int magic, rv;
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if ((magic = getc(f)) == EOF)
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return (ferror(f) ? EOF : 0);
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if (ungetc(magic, f) == EOF)
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return (EOF);
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if (magic != 0)
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/* Old record format. */
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rv = readrec_v1(f, av3);
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else
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/* New record formats. */
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rv = readrec_vx(f, av3);
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return (rv == EOF ? EOF : 1);
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}
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/*
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* Read an accounting record ending at the current
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* position of stream f.
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* Old-format records are converted to the current record
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* format.
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* The file pointer is positioned at the beginning of the
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* record read.
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* Return the number of records read (1 or 0 at the end-of-file),
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* or EOF on error.
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*/
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int
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readrec_backward(FILE *f, struct acctv3 *av3)
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{
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off_t pos;
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int c;
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uint16_t len;
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if ((pos = ftell(f)) == -1)
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return (EOF);
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if (pos == 0)
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return (0);
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if (fseek(f, -roffsetof(struct acctv3, ac_trailer),
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SEEK_CUR) == EOF ||
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(c = getc(f)) == EOF)
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return (EOF);
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if (c & ANVER) {
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/*
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* New record formats. For v2 and v3 offset from the
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* end for ac_len2 should be same.
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*/
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if (fseeko(f, pos - roffsetof(struct acctv2, ac_len2),
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SEEK_SET) == EOF ||
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fread_record(&len, sizeof(len), f) == EOF ||
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fseeko(f, pos - len, SEEK_SET) == EOF ||
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readrec_vx(f, av3) == EOF ||
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fseeko(f, pos - len, SEEK_SET) == EOF)
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return (EOF);
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else
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return (1);
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} else {
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/* Old record format. */
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if (fseeko(f, pos - sizeof(struct acctv1), SEEK_SET) == EOF ||
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readrec_v1(f, av3) == EOF ||
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fseeko(f, pos - sizeof(struct acctv1), SEEK_SET) == EOF)
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return (EOF);
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else
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return (1);
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}
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}
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