1 files changed, 130 insertions, 0 deletions
diff --git a/tests/lib/fuzz_zlog.c b/tests/lib/fuzz_zlog.c
new file mode 100644
index 0000000..14c8571
--- /dev/null
+++ b/tests/lib/fuzz_zlog.c
@@ -0,0 +1,130 @@
+/*
+ * zlog fuzzer target.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "zlog_5424.h"
+#include "command.h"
+
+struct input_opts {
+	uint16_t out1_debug;
+	uint16_t out2_debug;
+	uint16_t out3_warn;
+	uint8_t fmt;
+	uint8_t dst;
+};
+
+static char buffer[65536];
+
+int main(int argc, char **argv)
+{
+	struct input_opts io;
+	int fd;
+	int pair[2] = {-1, -1};
+
+	if (read(0, &io, sizeof(io)) != sizeof(io))
+		return 1;
+	if (io.fmt > ZLOG_FMT_LAST)
+		return 1;
+
+	switch (io.dst) {
+	case 0:
+		fd = 1;
+		break;
+	case 1:
+		socketpair(AF_UNIX, SOCK_STREAM, 0, pair);
+		fd = pair[0];
+		break;
+	case 2:
+		socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair);
+		fd = pair[0];
+		break;
+	case 3:
+		socketpair(AF_UNIX, SOCK_DGRAM, 0, pair);
+		fd = pair[0];
+		break;
+	default:
+		return 1;
+	}
+
+	pid_t child = -1;
+
+	if (pair[1] != -1) {
+		child = fork();
+
+		if (child == 0) {
+			char buf[4096];
+
+			close(pair[0]);
+
+			while (read(pair[1], buf, sizeof(buf)) > 0)
+				;
+			exit(0);
+		} else if (child == -1) {
+			perror("fork");
+			return 1;
+		}
+		close(pair[1]);
+	}
+
+	for (size_t i = 0; i < sizeof(buffer); i++)
+		buffer[i] = (i | 0x20) & 0x7f;
+
+	zlog_aux_init("FUZZBALL: ", LOG_DEBUG);
+	zlog_tls_buffer_init();
+
+	struct zlog_cfg_5424 cfg[1] = {};
+
+	zlog_5424_init(cfg);
+
+	cfg->facility = LOG_DAEMON;
+	cfg->prio_min = LOG_DEBUG;
+	cfg->kw_version = true;
+	cfg->kw_location = true;
+	cfg->kw_uid = true;
+	cfg->kw_ec = true;
+	cfg->kw_args = true;
+
+	cfg->ts_flags = 9;
+	cfg->fmt = io.fmt;
+	cfg->dst = ZLOG_5424_DST_FD;
+	cfg->fd = fd;
+
+	cmd_hostname_set("TEST");
+	cfg->master = thread_master_create("TEST");
+
+	zlog_5424_apply_dst(cfg);
+
+	zlog_debug("test #1 %.*s", (int)io.out1_debug, buffer);
+	zlog_debug("test #2 %.*s", (int)io.out2_debug, buffer);
+	zlog_warn("test #1 %.*s", (int)io.out3_warn, buffer);
+
+	zlog_tls_buffer_flush();
+	zlog_tls_buffer_fini();
+
+	/* AFL++ seems to do some weird stuff with its fuzzing target, make
+	 * sure the fork() child is zapped here rather than creating hordes
+	 * of it.
+	 */
+	close(fd);
+	if (child != -1)
+		kill(child, SIGTERM);
+
+	return 0;
+}