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-rw-r--r--tests-fuzz/knotd_wrap/udp-handler.c117
1 files changed, 117 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..e70616d
--- /dev/null
+++ b/tests-fuzz/knotd_wrap/udp-handler.c
@@ -0,0 +1,117 @@
+/* Copyright (C) 2023 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];
+ sockaddr_t 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(*rq));
+ 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 = sizeof(rq->buf[i]);
+ }
+
+ rq->addr.ip4.sin_family = AF_INET;
+ rq->addr.ip4.sin_addr.s_addr = IN_LOOPBACKNET;
+ rq->addr.ip4.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,
+ sizeof(rq->buf[RX]), 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, _unused_ const iface_t *iface, void *d)
+{
+ udp_stdin_t *rq = (udp_stdin_t *)d;
+ knotd_qdata_params_t params = params_init(KNOTD_QUERY_PROTO_UDP, &rq->addr,
+ &iface->addr, STDIN_FILENO, NULL, 0);
+ udp_handler(ctx, &params, &rq->iov[RX], &rq->iov[TX]);
+}
+
+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_msg_api = stdin_api;
+#ifdef ENABLE_RECVMMSG
+ udp_mmsg_api = stdin_api;
+#endif
+}