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-rw-r--r--lib/util/vsyslog.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/util/vsyslog.c b/lib/util/vsyslog.c
new file mode 100644
index 0000000..1eaaf96
--- /dev/null
+++ b/lib/util/vsyslog.c
@@ -0,0 +1,79 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2016-2017 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 <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+
+#include "sudo_compat.h"
+
+#ifndef HAVE_VSYSLOG
+void
+sudo_vsyslog(int pri, const char *fmt, va_list ap)
+{
+ int saved_errno = errno;
+ char *cp, *ep, msgbuf[8192], new_fmt[2048];
+ va_list ap2;
+ size_t len;
+
+ /* Rewrite fmt, replacing %m with an errno string. */
+ for (cp = new_fmt, ep = new_fmt + sizeof(new_fmt); *fmt != '\0'; fmt++) {
+ if (fmt[0] == '%' && fmt[1] == 'm') {
+ fmt++;
+ len = strlcpy(cp, strerror(saved_errno), (ep - cp));
+ if (len >= (size_t)(ep - cp))
+ len = (size_t)(ep - cp) - 1;
+ cp += len;
+ } else {
+ if (fmt[0] == '%' && fmt[1] == '%') {
+ fmt++;
+ if (cp < ep - 1)
+ *cp++ = '%';
+ }
+ if (cp < ep - 1)
+ *cp++ = *fmt;
+ }
+ }
+ *cp = '\0';
+
+ /* Format message and log it, using a static buffer if possible. */
+ va_copy(ap2, ap);
+ len = (size_t)vsnprintf(msgbuf, sizeof(msgbuf), new_fmt, ap2);
+ va_end(ap2);
+ if (len < sizeof(msgbuf)) {
+ syslog(pri, "%s", msgbuf);
+ } else {
+ /* Too big for static buffer? */
+ char *buf;
+ if (vasprintf(&buf, new_fmt, ap) != -1) {
+ syslog(pri, "%s", buf);
+ free(buf);
+ }
+ }
+}
+#endif /* HAVE_VSYSLOG */