1 files changed, 43 insertions, 0 deletions
diff --git a/testprogs/fuzz/fuzz_filter.c b/testprogs/fuzz/fuzz_filter.c
new file mode 100644
index 000000000000..de350672797f
--- /dev/null
+++ b/testprogs/fuzz/fuzz_filter.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <pcap/pcap.h>
+
+void fuzz_openFile(const char * name){
+    //do nothing
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+    pcap_t * pkts;
+    struct bpf_program bpf;
+    char * filter;
+
+    //we need at least 1 byte for linktype
+    if (Size < 1) {
+        return 0;
+    }
+
+    //initialize structure snaplen = 65535
+    pkts = pcap_open_dead(Data[Size-1], 0xFFFF);
+    if (pkts == NULL) {
+        printf("pcap_open_dead failed\n");
+        return 0;
+    }
+    filter = malloc(Size);
+    memcpy(filter, Data, Size);
+    //null terminate string
+    filter[Size-1] = 0;
+
+    if (pcap_compile(pkts, &bpf, filter, 1, PCAP_NETMASK_UNKNOWN) == 0) {
+        pcap_setfilter(pkts, &bpf);
+        pcap_close(pkts);
+        pcap_freecode(&bpf);
+    }
+    else {
+        pcap_close(pkts);
+    }
+    free(filter);
+
+    return 0;
+}