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-rw-r--r--lib/iolog/iolog_timing.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/lib/iolog/iolog_timing.c b/lib/iolog/iolog_timing.c
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+++ b/lib/iolog/iolog_timing.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2009-2020 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 <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include <compat/stdbool.h>
+#endif /* HAVE_STDBOOL_H */
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <time.h>
+
+#include <sudo_compat.h>
+#include <sudo_debug.h>
+#include <sudo_eventlog.h>
+#include <sudo_fatal.h>
+#include <sudo_gettext.h>
+#include <sudo_iolog.h>
+#include <sudo_util.h>
+
+static int timing_event_adj;
+
+void
+iolog_adjust_delay(struct timespec *delay, struct timespec *max_delay,
+ double scale_factor)
+{
+ debug_decl(iolog_adjust_delay, SUDO_DEBUG_UTIL);
+
+ if (scale_factor != 1.0) {
+ /* Order is important: we don't want to double the remainder. */
+ const double seconds = (double)delay->tv_sec / scale_factor;
+ const double nseconds = (double)delay->tv_nsec / scale_factor;
+ delay->tv_sec = (time_t)seconds;
+ delay->tv_nsec = (long)nseconds;
+ delay->tv_nsec += (long)((seconds - (double)delay->tv_sec) * 1000000000);
+ while (delay->tv_nsec >= 1000000000) {
+ delay->tv_sec++;
+ delay->tv_nsec -= 1000000000;
+ }
+ }
+
+ /* Clamp to max delay. */
+ if (max_delay != NULL) {
+ if (sudo_timespeccmp(delay, max_delay, >)) {
+ delay->tv_sec = max_delay->tv_sec;
+ delay->tv_nsec = max_delay->tv_nsec;
+ }
+ }
+
+ debug_return;
+}
+
+/*
+ * Parse the delay as seconds and nanoseconds: %lld.%09ld
+ * Sudo used to write this as a double, but since timing data is logged
+ * in the C locale this may not match the current locale.
+ */
+char *
+iolog_parse_delay(const char *cp, struct timespec *delay,
+ const char *decimal_point)
+{
+ char numbuf[STRLEN_MAX_SIGNED(long long) + 1];
+ const char *errstr, *ep;
+ long long llval;
+ size_t len;
+ debug_decl(iolog_parse_delay, SUDO_DEBUG_UTIL);
+
+ /* Parse seconds (whole number portion). */
+ for (ep = cp; isdigit((unsigned char)*ep); ep++)
+ continue;
+ len = (size_t)(ep - cp);
+ if (len >= sizeof(numbuf)) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: number of seconds is too large", cp);
+ debug_return_ptr(NULL);
+ }
+ memcpy(numbuf, cp, len);
+ numbuf[len] = '\0';
+ delay->tv_sec = (time_t)sudo_strtonum(numbuf, 0, TIME_T_MAX, &errstr);
+ if (errstr != NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: number of seconds is %s", numbuf, errstr);
+ debug_return_ptr(NULL);
+ }
+
+ /* Radix may be in user's locale for sudo < 1.7.4 so accept that too. */
+ if (*ep != '.' && *ep != *decimal_point) {
+ if (*ep == '\0' || isspace((unsigned char)*ep)) {
+ /* No fractional part. */
+ delay->tv_nsec = 0;
+ goto done;
+ }
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "invalid characters after seconds: %s", ep);
+ debug_return_ptr(NULL);
+ }
+ cp = ep + 1;
+
+ /* Parse fractional part, we may read more precision than we can store. */
+ for (ep = cp; isdigit((unsigned char)*ep); ep++)
+ continue;
+ len = (size_t)(ep - cp);
+ if (len >= sizeof(numbuf)) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: number of nanoseconds is too large", cp);
+ debug_return_ptr(NULL);
+ }
+ memcpy(numbuf, cp, len);
+ numbuf[len] = '\0';
+ llval = sudo_strtonum(numbuf, 0, LLONG_MAX, &errstr);
+ if (errstr != NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: number of nanoseconds is %s", numbuf, errstr);
+ debug_return_ptr(NULL);
+ }
+
+ /* Adjust fractional part to nanosecond precision. */
+ if (len < 9) {
+ /* Convert to nanosecond precision. */
+ do {
+ llval *= 10;
+ } while (++len < 9);
+ } else if (len > 9) {
+ /* Clamp to nanoseconds. */
+ do {
+ llval /= 10;
+ } while (--len > 9);
+ }
+ delay->tv_nsec = (long)llval;
+
+done:
+ /* Advance to the next field. */
+ while (isspace((unsigned char)*ep))
+ ep++;
+
+ debug_return_str((char *)ep);
+}
+
+/*
+ * Parse a timing line, which is formatted as:
+ * IO_EVENT_TTYOUT sleep_time num_bytes
+ * IO_EVENT_WINSIZE sleep_time lines cols
+ * IO_EVENT_SUSPEND sleep_time signo
+ * Where type is IO_EVENT_*, sleep_time is the number of seconds to sleep
+ * before writing the data and num_bytes is the number of bytes to output.
+ * Returns true on success and false on failure.
+ */
+bool
+iolog_parse_timing(const char *line, struct timing_closure *timing)
+{
+ unsigned long ulval;
+ char *cp, *ep;
+ debug_decl(iolog_parse_timing, SUDO_DEBUG_UTIL);
+
+ /* Clear iolog descriptor. */
+ timing->iol = NULL;
+
+ /* Parse event type. */
+ ulval = strtoul(line, &ep, 10);
+ if (ep == line || !isspace((unsigned char) *ep))
+ goto bad;
+ if (ulval >= IO_EVENT_COUNT)
+ goto bad;
+ if (ulval == IO_EVENT_TTYOUT_1_8_7) {
+ /* work around a bug in timing files generated by sudo 1.8.7 */
+ timing_event_adj = 2;
+ }
+ timing->event = (int)ulval - timing_event_adj;
+ for (cp = ep + 1; isspace((unsigned char) *cp); cp++)
+ continue;
+
+ /* Parse delay, returns the next field or NULL on error. */
+ if ((cp = iolog_parse_delay(cp, &timing->delay, timing->decimal)) == NULL)
+ goto bad;
+
+ switch (timing->event) {
+ case IO_EVENT_SUSPEND:
+ /* Signal name (no leading SIG prefix) or number. */
+ if (str2sig(cp, &timing->u.signo) == -1)
+ goto bad;
+ break;
+ case IO_EVENT_WINSIZE:
+ ulval = strtoul(cp, &ep, 10);
+ if (ep == cp || !isspace((unsigned char) *ep))
+ goto bad;
+ if (ulval > INT_MAX)
+ goto bad;
+ timing->u.winsize.lines = (int)ulval;
+ for (cp = ep + 1; isspace((unsigned char) *cp); cp++)
+ continue;
+
+ ulval = strtoul(cp, &ep, 10);
+ if (ep == cp || *ep != '\0')
+ goto bad;
+ if (ulval > INT_MAX)
+ goto bad;
+ timing->u.winsize.cols = (int)ulval;
+ break;
+ default:
+ errno = 0;
+ ulval = strtoul(cp, &ep, 10);
+ if (ep == cp || *ep != '\0')
+ goto bad;
+ /* Note: assumes SIZE_MAX == ULONG_MAX */
+ if (errno == ERANGE && ulval == ULONG_MAX)
+ goto bad;
+ timing->u.nbytes = (size_t)ulval;
+ break;
+ }
+
+ debug_return_bool(true);
+bad:
+ debug_return_bool(false);
+}
+
+/*
+ * Read the next record from the timing file.
+ * Return 0 on success, 1 on EOF and -1 on error.
+ */
+int
+iolog_read_timing_record(struct iolog_file *iol, struct timing_closure *timing)
+{
+ char line[LINE_MAX];
+ const char *errstr;
+ debug_decl(iolog_read_timing_record, SUDO_DEBUG_UTIL);
+
+ /* Read next record from timing file. */
+ if (iolog_gets(iol, line, sizeof(line), &errstr) == NULL) {
+ /* EOF or error reading timing file, we are done. */
+ if (iolog_eof(iol))
+ debug_return_int(1);
+ sudo_warnx(U_("error reading timing file: %s"), errstr);
+ debug_return_int(-1);
+ }
+
+ /* Parse timing file record. */
+ line[strcspn(line, "\n")] = '\0';
+ if (!iolog_parse_timing(line, timing)) {
+ sudo_warnx(U_("invalid timing file line: %s"), line);
+ debug_return_int(-1);
+ }
+
+ debug_return_int(0);
+}
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