v1.1.3-RC-01 from http://www.packetfactory.net/projects/libnet/

1 files changed, 193 insertions, 0 deletions

diff --git a/libnet/sample/ntp.c b/libnet/sample/ntp.c
new file mode 100644
index 0000000..0fef46f
--- /dev/null
+++ b/libnet/sample/ntp.c
@@ -0,0 +1,193 @@
+/*
+ *  $Id: ntp.c,v 1.3 2004/02/20 18:53:49 mike Exp $
+ *
+ *  libnet 1.1
+ *  Build an NTP Packet
+ *
+ *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
+ *  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#if (HAVE_CONFIG_H)
+#include "../include/config.h"
+#endif
+#include "./libnet_test.h"
+
+int
+main(int argc, char **argv)
+{
+    int c;
+    libnet_t *l;
+    u_long dst_ip;
+    libnet_ptag_t t;
+    char errbuf[LIBNET_ERRBUF_SIZE];
+
+    printf("libnet 1.1 NTP packet shaping[raw -- autobuilding IP]\n");
+
+    /*
+     *  Initialize the library.  Root priviledges are required.
+     */
+    l = libnet_init(
+            LIBNET_RAW4,                            /* injection type */
+            NULL,                                   /* network interface */
+            errbuf);                                /* error buf */
+
+    if (l == NULL)
+    {
+        fprintf(stderr, "libnet_init() failed: %s", errbuf);
+        exit(EXIT_FAILURE);
+    }
+
+    dst_ip  = 0;
+    while((c = getopt(argc, argv, "d:")) != EOF)
+    {
+        switch (c)
+        {
+            /*
+             *  We expect the input to be of the form `ip.ip.ip.ip.port`.  We
+             *  point cp to the last dot of the IP address/port string and
+             *  then seperate them with a NULL byte.  The optarg now points to
+             *  just the IP address, and cp points to the port.
+             */
+            case 'd':
+                if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
+                {
+                    fprintf(stderr, "Bad destination IP address: %s\n", optarg);
+                    exit(1);
+                }
+                break;
+        }
+    }
+    if (!dst_ip)
+    {
+        usage(argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    /*
+     *  Build the packet, remmebering that order IS important.  We must
+     *  build the packet from lowest protocol type on up as it would
+     *  appear on the wire.  So for our NTP packet:
+     *
+     *  --------------------------------------------------------------------
+     *  |      IP           |  UDP   |              NTP                    |   
+     *  --------------------------------------------------------------------
+     *         ^                 ^                      ^
+     *         |--------------   |                      |
+     *  libnet_build_ipv4()--|   |                      |
+     *                           |                      |
+     *  libnet_build_udp()-------|                      |
+     *                                                  |
+     *  libnet_build_ntp()------------------------------|
+     */
+    t = libnet_build_ntp(
+        LIBNET_NTP_LI_AC,                           /* leap indicator */
+        LIBNET_NTP_VN_4,                            /* version */
+        LIBNET_NTP_MODE_S,                          /* mode */
+        LIBNET_NTP_STRATUM_PRIMARY,                 /* stratum */
+        4,                                          /* poll interval */
+        1,                                          /* precision */
+        0xffff,                                     /* delay interval */
+        0xffff,                                     /* delay fraction */
+        0xffff,                                     /* dispersion interval */
+        0xffff,                                     /* dispersion fraction */
+        LIBNET_NTP_REF_PPS,                         /* reference id */
+        0x11,                                       /* reference ts int */
+        0x22,                                       /* reference ts frac */
+        0x33,                                       /* originate ts int */
+        0x44,                                       /* originate ts frac */
+        0x55,                                       /* receive ts int */
+        0x66,                                       /* receive ts frac */
+        0x77,                                       /* transmit ts interval */
+        0x88,                                       /* transmit ts fraction */
+        NULL,                                       /* payload */
+        0,                                          /* payload size */
+        l,                                          /* libnet handle */
+        0);                                         /* libnet id */
+    if (t == -1)
+    {
+        fprintf(stderr, "Can't build NTP header: %s\n", libnet_geterror(l));
+        goto bad;
+    }
+
+    libnet_seed_prand(l);
+    t = libnet_build_udp(
+        libnet_get_prand(LIBNET_PRu16),             /* source port */
+        123,                                        /* NTP port */
+        LIBNET_UDP_H + LIBNET_NTP_H,                /* UDP packet length */
+        0,                                          /* checksum */
+        NULL,                                       /* payload */
+        0,                                          /* payload size */
+        l,                                          /* libnet handle */
+        0);                                         /* libnet id */
+    if (t == -1)
+    {
+        fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
+        goto bad;
+    }
+
+    t = libnet_autobuild_ipv4(
+        LIBNET_IPV4_H + LIBNET_UDP_H + LIBNET_NTP_H,/* packet length */
+        IPPROTO_UDP,
+        dst_ip,
+        l);
+    if (t == -1)
+    {
+        fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
+        goto bad;
+    }
+
+    /*
+     *  Write it to the wire.
+     */
+
+    fprintf(stderr, "l contains a %d byte packet\n", libnet_getpacket_size(l));
+    c = libnet_write(l);
+    if (c == -1)
+    {
+        fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
+        goto bad;
+    }
+    else
+    {
+        fprintf(stderr, "Wrote %d byte NTP packet; check the wire.\n", c);
+    }
+    libnet_destroy(l);
+    return (EXIT_SUCCESS);
+bad:
+    libnet_destroy(l);
+    return (EXIT_FAILURE);
+}
+
+
+void
+usage(char *name)
+{
+    fprintf(stderr,
+        "usage: %s -d destination_ip\n",
+        name);
+}
+
+/* EOF */