1 files changed, 58 insertions, 0 deletions
diff --git a/src/cmd/ip/snoopy/Linux.c b/src/cmd/ip/snoopy/Linux.c
new file mode 100644
index 00000000..20bc899c
--- /dev/null
+++ b/src/cmd/ip/snoopy/Linux.c
@@ -0,0 +1,58 @@
+#include <u.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <libc.h>
+#include <ip.h>
+#include <bio.h>
+#include <fcall.h>
+#include <libsec.h>
+#include "dat.h"
+#include "protos.h"
+#include "y.tab.h"
+
+int
+opendevice(char *dev, int promisc)
+{
+	int fd;
+	struct ifreq ifr;
+	struct sockaddr_ll sa;
+
+	if((fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
+		return -1;
+
+	if(dev){
+		memset(&ifr, 0, sizeof ifr);
+		strncpy(ifr.ifr_name, dev, sizeof ifr.ifr_name);
+		if(ioctl(fd, SIOCGIFINDEX, &ifr) < 0){
+			close(fd);
+			return -1;
+		}
+		memset(&sa, 0, sizeof sa);
+		sa.sll_family = AF_PACKET;
+		sa.sll_protocol = htons(ETH_P_ALL);
+		sa.sll_ifindex = ifr.ifr_ifindex;
+		if(bind(fd, (struct sockaddr*)&sa, sizeof sa) < 0){
+			close(fd);
+			return -1;
+		}
+	}
+
+	if(promisc){
+		memset(&ifr, 0, sizeof ifr);
+		strncpy(ifr.ifr_name, dev, sizeof ifr.ifr_name);
+		if(ioctl(fd, SIOCGIFFLAGS, &ifr) < 0){
+			close(fd);
+			return -1;
+		}
+		ifr.ifr_flags |= IFF_PROMISC;
+		if(ioctl(fd, SIOCSIFFLAGS, &ifr) < 0){
+			close(fd);
+			return -1;
+		}
+	}
+	return fd;
+}