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-rw-r--r--lib/iolog/iolog_read.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/iolog/iolog_read.c b/lib/iolog/iolog_read.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2009-2021 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>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include <compat/stdbool.h>
+#endif
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <time.h>
+
+#include <sudo_compat.h>
+#include <sudo_debug.h>
+#include <sudo_iolog.h>
+
+/*
+ * Read from a (possibly compressed) I/O log file.
+ */
+ssize_t
+iolog_read(struct iolog_file *iol, void *buf, size_t nbytes,
+ const char **errstr)
+{
+ ssize_t nread;
+ debug_decl(iolog_read, SUDO_DEBUG_UTIL);
+
+ if (nbytes > UINT_MAX || nbytes > SSIZE_MAX) { // -V590
+ errno = EINVAL;
+ if (errstr != NULL)
+ *errstr = strerror(errno);
+ debug_return_ssize_t(-1);
+ }
+
+#ifdef HAVE_ZLIB_H
+ if (iol->compressed) {
+ if ((nread = gzread(iol->fd.g, buf, (unsigned int)nbytes)) == -1) {
+ if (errstr != NULL) {
+ int errnum;
+ *errstr = gzerror(iol->fd.g, &errnum);
+ if (errnum == Z_ERRNO)
+ *errstr = strerror(errno);
+ }
+ }
+ } else
+#endif
+ {
+ nread = (ssize_t)fread(buf, 1, nbytes, iol->fd.f);
+ if (nread <= 0 && ferror(iol->fd.f)) {
+ nread = -1;
+ if (errstr != NULL)
+ *errstr = strerror(errno);
+ }
+ }
+ debug_return_ssize_t(nread);
+}