1 files changed, 116 insertions, 0 deletions
diff --git a/tests-fuzz/knotd_wrap/udp-handler.c b/tests-fuzz/knotd_wrap/udp-handler.c
new file mode 100644
index 0000000..cdd8727
--- /dev/null
+++ b/tests-fuzz/knotd_wrap/udp-handler.c
@@ -0,0 +1,116 @@
+/*  Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    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 3 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.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <signal.h>
+
+#include "knot/server/udp-handler.c"
+#include "knot/common/log.h"
+
+typedef struct {
+	struct iovec iov[NBUFS];
+	uint8_t buf[NBUFS][KNOT_WIRE_MAX_PKTSIZE];
+	struct sockaddr_storage addr;
+	bool afl_persistent;
+} udp_stdin_t;
+
+static inline void next(udp_stdin_t *rq)
+{
+	if (rq->afl_persistent) {
+		raise(SIGSTOP);
+	} else {
+		exit(0);
+	}
+}
+
+static void *udp_stdin_init(_unused_ udp_context_t *ctx, _unused_ void *xdp_sock)
+{
+	udp_stdin_t *rq = calloc(1, sizeof(udp_stdin_t));
+	if (rq == NULL) {
+		return NULL;
+	}
+
+	for (unsigned i = 0; i < NBUFS; ++i) {
+		rq->iov[i].iov_base = rq->buf[i];
+		rq->iov[i].iov_len = KNOT_WIRE_MAX_PKTSIZE;
+	}
+
+	struct sockaddr_in *a = (struct sockaddr_in *)&rq->addr;
+	a->sin_family = AF_INET;
+	a->sin_addr.s_addr = IN_LOOPBACKNET;
+	a->sin_port = 42;
+
+	rq->afl_persistent = getenv("AFL_PERSISTENT") != NULL;
+
+	return rq;
+}
+
+static void udp_stdin_deinit(void *d)
+{
+	free(d);
+}
+
+static int udp_stdin_recv(_unused_ int fd, void *d)
+{
+	udp_stdin_t *rq = (udp_stdin_t *)d;
+	rq->iov[RX].iov_len = fread(rq->iov[RX].iov_base, 1,
+	                            KNOT_WIRE_MAX_PKTSIZE, stdin);
+	if (rq->iov[RX].iov_len == 0) {
+		next(rq);
+	}
+
+	return rq->iov[RX].iov_len;
+}
+
+static void udp_stdin_handle(udp_context_t *ctx, void *d)
+{
+	udp_stdin_t *rq = (udp_stdin_t *)d;
+	udp_handle(ctx, STDIN_FILENO, &rq->addr, &rq->iov[RX], &rq->iov[TX], false);
+}
+
+static void udp_stdin_send(void *d)
+{
+	udp_stdin_t *rq = (udp_stdin_t *)d;
+	next(rq);
+}
+
+static udp_api_t stdin_api = {
+	udp_stdin_init,
+	udp_stdin_deinit,
+	udp_stdin_recv,
+	udp_stdin_handle,
+	udp_stdin_send
+};
+
+void udp_master_init_stdio(server_t *server) {
+
+	log_info("AFL, UDP handler listening on stdin");
+
+	// Register dummy interface to server.
+	iface_t *ifc = calloc(1, sizeof(*ifc));
+	assert(ifc);
+	ifc->fd_udp = calloc(1, sizeof(*ifc->fd_udp));
+	assert(ifc->fd_udp);
+	ifc->fd_udp[0] = STDIN_FILENO;
+	ifc->fd_udp_count = 1;
+
+	server->n_ifaces = 1;
+	server->ifaces = ifc;
+
+	udp_recvfrom_api = stdin_api;
+#ifdef ENABLE_RECVMMSG
+	udp_recvmmsg_api = stdin_api;
+#endif
+}