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-rw-r--r--lib/iolog/iolog_path.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/lib/iolog/iolog_path.c b/lib/iolog/iolog_path.c
new file mode 100644
index 0000000..16f228c
--- /dev/null
+++ b/lib/iolog/iolog_path.c
@@ -0,0 +1,130 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2011-2015 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 <limits.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"
+
+/*
+ * Expand any escape sequences in inpath, returning the expanded path.
+ */
+bool
+expand_iolog_path(const char *inpath, char *path, size_t pathlen,
+ const struct iolog_path_escape *escapes, void *closure)
+{
+ char *dst, *pathend, tmpbuf[PATH_MAX];
+ const char *endbrace, *src;
+ bool strfit = false;
+ size_t len;
+ debug_decl(expand_iolog_path, SUDO_DEBUG_UTIL);
+
+ /* Collapse multiple leading slashes. */
+ while (inpath[0] == '/' && inpath[1] == '/')
+ inpath++;
+
+ pathend = path + pathlen;
+ for (src = inpath, dst = path; *src != '\0'; src++) {
+ if (src[0] == '%') {
+ if (src[1] == '{') {
+ endbrace = strchr(src + 2, '}');
+ if (endbrace != NULL) {
+ const struct iolog_path_escape *esc;
+ len = (size_t)(endbrace - src - 2);
+ for (esc = escapes; esc->name != NULL; esc++) {
+ if (strncmp(src + 2, esc->name, len) == 0 &&
+ esc->name[len] == '\0')
+ break;
+ }
+ if (esc->name != NULL) {
+ len = esc->copy_fn(dst, (size_t)(pathend - dst),
+ closure);
+ if (len >= (size_t)(pathend - dst))
+ goto bad;
+ dst += len;
+ src = endbrace;
+ continue;
+ }
+ }
+ } else if (src[1] == '%') {
+ /* Collapse %% -> % */
+ src++;
+ } else {
+ /* May need strftime() */
+ strfit = true;
+ }
+ }
+ /* Need at least 2 chars, including the NUL terminator. */
+ if (dst + 1 >= pathend)
+ goto bad;
+ *dst++ = *src;
+ }
+
+ /* Trim trailing slashes and NUL terminate. */
+ while (dst > path && dst[-1] == '/')
+ dst--;
+ *dst = '\0';
+
+ /* Expand strftime escapes as needed. */
+ if (strfit) {
+ struct tm tm;
+ time_t now;
+
+ time(&now);
+ if (localtime_r(&now, &tm) == NULL)
+ goto bad;
+
+ /* We only call strftime() on the current part of the buffer. */
+ tmpbuf[sizeof(tmpbuf) - 1] = '\0';
+ len = strftime(tmpbuf, sizeof(tmpbuf), path, &tm);
+
+ if (len == 0 || tmpbuf[sizeof(tmpbuf) - 1] != '\0')
+ goto bad; /* strftime() failed, buf too small? */
+
+ if (len >= (size_t)(pathend - path))
+ goto bad; /* expanded buffer too big to fit. */
+ memcpy(path, tmpbuf, len);
+ dst = path + len;
+ *dst = '\0';
+ }
+
+ debug_return_bool(true);
+bad:
+ debug_return_bool(false);
+}