1 files changed, 78 insertions, 0 deletions
diff --git a/src/libsystemd-network/fuzz-dhcp-client.c b/src/libsystemd-network/fuzz-dhcp-client.c
new file mode 100644
index 0000000..6ca9f51
--- /dev/null
+++ b/src/libsystemd-network/fuzz-dhcp-client.c
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "sd-dhcp-client.c"
+
+#include "alloc-util.h"
+#include "fuzz.h"
+
+int dhcp_network_bind_raw_socket(
+                int ifindex,
+                union sockaddr_union *link,
+                uint32_t id,
+                const struct hw_addr_data *hw_addr,
+                const struct hw_addr_data *bcast_addr,
+                uint16_t arp_type, uint16_t port) {
+
+        int fd;
+        fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
+        if (fd < 0)
+                return -errno;
+
+        return fd;
+}
+
+int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link, const void *packet, size_t len) {
+        return len;
+}
+
+int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port, int ip_service_type) {
+        int fd;
+
+        fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
+        if (fd < 0)
+                return -errno;
+
+        return fd;
+}
+
+int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port, const void *packet, size_t len) {
+        return len;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+        uint8_t mac_addr[] = {'A', 'B', 'C', '1', '2', '3'};
+        uint8_t bcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
+        _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = NULL;
+        _cleanup_(sd_event_unrefp) sd_event *e = NULL;
+        int res, r;
+
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
+        r = sd_dhcp_client_new(&client, false);
+        assert_se(r >= 0);
+        assert_se(client);
+
+        assert_se(sd_event_new(&e) >= 0);
+
+        r = sd_dhcp_client_attach_event(client, e, 0);
+        assert_se(r >= 0);
+
+        assert_se(sd_dhcp_client_set_ifindex(client, 42) >= 0);
+        assert_se(sd_dhcp_client_set_mac(client, mac_addr, bcast_addr, ETH_ALEN, ARPHRD_ETHER) >= 0);
+        dhcp_client_set_test_mode(client, true);
+
+        res = sd_dhcp_client_start(client);
+        assert_se(IN_SET(res, 0, -EINPROGRESS));
+        client->xid = 2;
+
+        (void) client_handle_offer(client, (DHCPMessage*) data, size);
+
+        assert_se(sd_dhcp_client_stop(client) >= 0);
+
+        return 0;
+}