Initialize snaplen.

That shouldn't be necessary, but it avoids compiler warnings with older
versions of Visual Studio.

1 files changed, 25 insertions, 0 deletions

diff --git a/pcap-npf.c b/pcap-npf.c
index 2c7fd9f5..06f6bba0 100644
--- a/pcap-npf.c
+++ b/pcap-npf.c
@@ -908,6 +908,8 @@ pcap_activate_npf(pcap_t *p)
 	NetType type;
 	int res;
 	int status = 0;
+	struct bpf_insn total_insn;
+	struct bpf_program total_prog;
 
 	if (p->opt.rfmon) {
 		/*
@@ -1231,6 +1233,29 @@ pcap_activate_npf(pcap_t *p)
 #endif /* HAVE_DAG_API */
 	}
 
+	/*
+	 * If there's no filter program installed, there's
+	 * no indication to the kernel of what the snapshot
+	 * length should be, so no snapshotting is done.
+	 *
+	 * Therefore, when we open the device, we install
+	 * an "accept everything" filter with the specified
+	 * snapshot length.
+	 */
+	total_insn.code = (u_short)(BPF_RET | BPF_K);
+	total_insn.jt = 0;
+	total_insn.jf = 0;
+	total_insn.k = p->snapshot;
+
+	total_prog.bf_len = 1;
+	total_prog.bf_insns = &total_insn;
+	if (!PacketSetBpf(pw->adapter, &total_prog)) {
+		pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE,
+		    GetLastError(), "PacketSetBpf");
+		status = PCAP_ERROR;
+		goto bad;
+	}
+
 	PacketSetReadTimeout(pw->adapter, p->opt.timeout);
 
 	/* disable loopback capture if requested */