On 02/18/2013 04:44 AM, Willem de Bruijn wrote:
A BPF compiler to convert tcpudmp expressions to the decimal format accepted
by the libxt_bpf.
[...]
--- /dev/null
+++ b/utils/bpf_compile.c
@@ -0,0 +1,55 @@
+/*
+ * BPF program compilation tool
+ *
+ * Generates decimal output, similar to `tcpdump -ddd ...`.
+ * Unlike tcpdump, will generate for any given link layer type.
+ *
+ * There is no makefile:
+ * compile with `gcc -Wall -o bpf2decimal bpf2decimal.c -lpcap` or similar.
+ *
+ * Written by Willem de Bruijn (willemb@xxxxxxxxxx)
+ * Copyright Google, Inc. 2013
+ * Licensed under the GNU General Public License version 2 (GPLv2)
+*/
+
+#include <pcap.h>
+#include <stdio.h>
+
+int main(int argc, char **argv)
+{
+ struct bpf_program program;
+ struct bpf_insn *ins;
+ int i, dlt = DLT_RAW;
+
+ if (argc < 2 || argc > 3) {
+ fprintf(stderr, "Usage: %s [link] '<program>'\n\n"
+ " link is a pcap linklayer type:\n"
+ " one of EN10MB, RAW, SLIP, ...\n\n"
+ "Examples: %s RAW 'tcp and greater 100'\n"
+ " %s EN10MB 'ip proto 47'\n'",
+ argv[0], argv[0], argv[0]);
+ return 1;
+ }
+
+ if (argc == 3) {
+ dlt = pcap_datalink_name_to_val(argv[1]);
+ if (dlt == -1) {
+ fprintf(stderr, "Unknown datalinktype: %s\n", argv[1]);
+ return 1;
+ }
+ }
+
+ if (pcap_compile_nopcap(65535, dlt, &program, argv[argc - 1], 1,
+ PCAP_NETMASK_UNKNOWN)) {
+ fprintf(stderr, "Compilation error\n");
+ return 1;
+ }
+
+ printf("%d\n", program.bf_len);
+ ins = program.bf_insns;
+ for (i = 0; i < program.bf_len; ++ins, ++i)
+ printf("%u %u %u %u\n", ins->code, ins->jt, ins->jf, ins->k);
Here I think you should release the internally allocated memory by adding a:
pcap_freecode(&program);
+ return 0;
+}
+
--
To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
