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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sys/types.h>
#include <errno.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include <compat/stdbool.h>
#endif /* HAVE_STDBOOL_H */
#if defined(HAVE_STDINT_H)
# include <stdint.h>
#elif defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sudo_compat.h>
#include <sudo_debug.h>
#include <sudo_fatal.h>
#include <sudo_gettext.h>
#include <sudo_iolog.h>
#include <sudo_util.h>
#include "logsrv_util.h"
/*
* Expand buf as needed or just reset it.
*/
bool
expand_buf(struct connection_buffer *buf, size_t needed)
{
void *newdata;
debug_decl(expand_buf, SUDO_DEBUG_UTIL);
if (buf->size < needed) {
/* Expand buffer. */
const size_t newsize = sudo_pow2_roundup(needed);
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"expanding buffer from %zu to %zu", buf->size, newsize);
if (newsize < needed) {
/* overflow */
errno = ENOMEM;
goto oom;
}
if ((newdata = malloc(newsize)) == NULL)
goto oom;
if (buf->len != buf->off)
memcpy(newdata, buf->data + buf->off, buf->len - buf->off);
free(buf->data);
buf->data = newdata;
buf->size = newsize;
} else {
/* Just reset existing buffer. */
if (buf->len != buf->off) {
memmove(buf->data, buf->data + buf->off,
buf->len - buf->off);
}
}
buf->len -= buf->off;
buf->off = 0;
debug_return_bool(true);
oom:
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_bool(false);
}
/*
* Open any I/O log files that are present.
* The timing file must always exist.
*/
bool
iolog_open_all(int dfd, const char *iolog_dir, struct iolog_file *iolog_files,
const char *mode)
{
int iofd;
debug_decl(iolog_open_all, SUDO_DEBUG_UTIL);
for (iofd = 0; iofd < IOFD_MAX; iofd++) {
iolog_files[iofd].enabled = true;
if (!iolog_open(&iolog_files[iofd], dfd, iofd, mode)) {
if (errno != ENOENT) {
sudo_warn(U_("unable to open %s/%s"), iolog_dir,
iolog_fd_to_name(iofd));
debug_return_bool(false);
}
}
}
if (!iolog_files[IOFD_TIMING].enabled) {
sudo_warn(U_("unable to open %s/%s"), iolog_dir,
iolog_fd_to_name(IOFD_TIMING));
debug_return_bool(false);
}
debug_return_bool(true);
}
/*
* Seek to the specified point in time in the I/O logs.
*/
bool
iolog_seekto(int iolog_dir_fd, const char *iolog_path,
struct iolog_file *iolog_files, struct timespec *elapsed_time,
const struct timespec *target)
{
struct timing_closure timing;
off_t pos;
debug_decl(iolog_seekto, SUDO_DEBUG_UTIL);
if (!sudo_timespecisset(target)) {
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"resuming at start of file [0, 0]");
debug_return_bool(true);
}
memset(&timing, 0, sizeof(timing));
timing.decimal = ".";
/* Parse timing file until we reach the target point. */
for (;;) {
switch (iolog_read_timing_record(&iolog_files[IOFD_TIMING], &timing)) {
case 0:
break;
case 1:
/* EOF reading timing file. */
sudo_warnx(U_("%s/%s: unable to find resume point [%lld, %ld]"),
iolog_path, "timing", (long long)target->tv_sec,
target->tv_nsec);
goto bad;
default:
/* Error printed by iolog_read_timing_record(). */
goto bad;
}
sudo_timespecadd(elapsed_time, &timing.delay, elapsed_time);
if (timing.event < IOFD_TIMING) {
if (!iolog_files[timing.event].enabled) {
/* Missing log file. */
sudo_warn(U_("missing I/O log file %s/%s"), iolog_path,
iolog_fd_to_name(timing.event));
goto bad;
}
pos = iolog_seek(&iolog_files[timing.event], (off_t)timing.u.nbytes,
SEEK_CUR);
if (pos == -1) {
sudo_warn(U_("%s/%s: unable to seek forward %zu"), iolog_path,
iolog_fd_to_name(timing.event), timing.u.nbytes);
goto bad;
}
}
if (sudo_timespeccmp(elapsed_time, target, >=)) {
if (sudo_timespeccmp(elapsed_time, target, ==))
break;
/* Mismatch between resume point and stored log. */
sudo_warnx(U_("%s/%s: unable to find resume point [%lld, %ld]"),
iolog_path, "timing", (long long)target->tv_sec,
target->tv_nsec);
goto bad;
}
}
debug_return_bool(true);
bad:
debug_return_bool(false);
}
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