initial

1 files changed, 78 insertions, 0 deletions

diff --git a/other/b-scan/tmp/src/arpg.c b/other/b-scan/tmp/src/arpg.c
new file mode 100644
index 0000000..0c8a620
--- /dev/null
+++ b/other/b-scan/tmp/src/arpg.c
@@ -0,0 +1,78 @@
+/*
+ * bscan arp routine
+ */
+#include <bscan/arpg.h>
+#include <bscan/snarf.h>
+#include <libnet.h>
+
+
+
+void
+prepare_libnet (struct _libnet *lnet)
+{
+
+    if (lnet->device == NULL)
+    {
+        struct sockaddr_in sin;
+        if (libnet_select_device (&sin, &lnet->device, lnet->err_buf) == -1)
+            libnet_error (LIBNET_ERR_FATAL,
+                          "libnet_select_device failed: %s\n", lnet->err_buf);
+    }
+
+    if (
+        (lnet->network =
+         libnet_open_link_interface (lnet->device, lnet->err_buf)) == NULL)
+        libnet_error (LIBNET_ERR_FATAL,
+                      "libnet_open_link_interface '%s': %s\n", lnet->device,
+                      lnet->err_buf);
+
+
+    lnet->packet_size = 60;     /* min ethernet frame length -4 CRC */
+    if (libnet_init_packet (lnet->packet_size, &lnet->packet) == -1)
+        libnet_error (LIBNET_ERR_FATAL, "libnet_init_packet failed\n");
+
+}
+
+/*
+ * play arp-god: sends out arp-reply
+ * return: same as libnet_write_link_layer
+ * -1 on failure or bytes written 
+ */
+int
+play_arpg (struct _libnet *lnet, u_char spf_sip[4], u_char spf_smac[6],
+           u_char spf_dip[4], u_char spf_dmac[6])
+{
+    int c;
+
+#ifdef DEBUG
+    printf ("sending out arp\n");
+#endif
+    libnet_build_ethernet (spf_dmac,
+                           spf_smac, ETHERTYPE_ARP, NULL, 0, lnet->packet);
+
+    libnet_build_arp (ARPHRD_ETHER, ETHERTYPE_IP,       /* arp for which protocol ? */
+                      6,        /* hardware addr. length */
+                      4,        /* protocol addr. length */
+                      ARPOP_REPLY, spf_smac, spf_sip, spf_dmac, spf_dip, NULL,  /* packet payload */
+                      0,        /* length of payload */
+                      lnet->packet + LIBNET_ETH_H);
+
+    c =
+        libnet_write_link_layer (lnet->network, lnet->device, lnet->packet,
+                                 lnet->packet_size);
+    if (c < lnet->packet_size)
+    {
+        libnet_error (LN_ERR_WARNING,
+                      "libnet_write_link_layer only wrote %d bytes\n", c);
+    }
+#ifdef DEBUG
+    else
+    {
+        printf ("construction and injection completed, wrote all %d bytes\n",
+                c);
+    }
+#endif
+
+    return (c);
+}
+