v1.1.2.1 from http://www.packetfactory.net/projects/libnet/

1 files changed, 350 insertions, 0 deletions

diff --git a/libnet/src/libnet_build_bgp.c b/libnet/src/libnet_build_bgp.c
new file mode 100644
index 0000000..5d58df6
--- /dev/null
+++ b/libnet/src/libnet_build_bgp.c
@@ -0,0 +1,350 @@
+/*
+ *  $Id: libnet_build_bgp.c,v 1.7 2003/10/30 23:26:32 mike Exp $
+ *
+ *  libnet
+ *  libnet_build_bgp.c - BGP packet assembler (RFC 1771)
+ *
+ *  Copyright (c) 2003 Frederic Raynal <pappy@security-labs.org>
+ *  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
+#if (!(_WIN32) || (__CYGWIN__)) 
+#include "../include/libnet.h"
+#else
+#include "../include/win32/libnet.h"
+#endif
+
+libnet_ptag_t
+libnet_build_bgp4_header(u_int8_t marker[LIBNET_BGP4_MARKER_SIZE], 
+       u_int16_t len, u_int8_t type, u_int8_t *payload, u_int32_t payload_s,
+       libnet_t *l, libnet_ptag_t ptag)
+{
+    u_int32_t n, h;
+    libnet_pblock_t *p;
+    struct libnet_bgp4_header_hdr bgp4_hdr;
+
+    if (l == NULL)
+    { 
+        return (-1);
+    } 
+
+    n = LIBNET_BGP4_HEADER_H + payload_s;   /* size of memory block */
+    h = 0;                                  /* BGP headers have no checksum */
+
+    /*
+     *  Find the existing protocol block if a ptag is specified, or create
+     *  a new one.
+     */
+    p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_BGP4_HEADER_H);
+    if (p == NULL)
+    {
+        return (-1);
+    }
+
+	memset(&bgp4_hdr, 0, sizeof(bgp4_hdr));
+	memcpy(bgp4_hdr.marker, marker, LIBNET_BGP4_MARKER_SIZE * sizeof (u_int8_t));
+    bgp4_hdr.len = htons(len);
+    bgp4_hdr.type = type;
+
+    n = libnet_pblock_append(l, p, (u_int8_t *)&bgp4_hdr, LIBNET_BGP4_HEADER_H);
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    if ((payload && !payload_s) || (!payload && payload_s))
+    {
+         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
+			     "%s(): payload inconsistency\n", __func__);
+        goto bad;
+    }
+
+    if (payload && payload_s)
+    {
+        n = libnet_pblock_append(l, p, payload, payload_s);
+        if (n == -1)
+        {
+            /* err msg set in libnet_pblock_append() */
+            goto bad;
+        }
+    }
+    
+    return (ptag ? ptag : libnet_pblock_update(l, p, h,
+            LIBNET_PBLOCK_BGP4_HEADER_H));
+bad:
+    libnet_pblock_delete(l, p);
+    return (-1);
+}
+
+libnet_ptag_t
+libnet_build_bgp4_open(u_int8_t version, u_int16_t src_as, u_int16_t hold_time,
+            u_int32_t bgp_id, u_int8_t opt_len, u_int8_t *payload, u_int32_t payload_s,
+	    libnet_t *l, libnet_ptag_t ptag)
+{
+    u_int32_t n, h;
+    libnet_pblock_t *p;
+    u_int16_t val;
+
+    if (l == NULL)
+    { 
+        return (-1);
+    } 
+
+    n = LIBNET_BGP4_OPEN_H + payload_s;     /* size of memory block */
+    h = 0;                                  /* BGP msg have no checksum */
+
+    /*
+     *  Find the existing protocol block if a ptag is specified, or create
+     *  a new one.
+     */
+    p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_BGP4_OPEN_H);
+    if (p == NULL)
+    {
+        return (-1);
+    }
+
+    /* for memory alignment reason, we need to append each field separately */
+    n = libnet_pblock_append(l, p, (u_int8_t *)&version, sizeof (version));
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    val = htons(src_as);
+    n = libnet_pblock_append(l, p, (u_int8_t *)&val, sizeof(src_as));
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    val = htons(hold_time);
+    n = libnet_pblock_append(l, p, (u_int8_t *)&val, sizeof(hold_time));
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    n = htonl(bgp_id);
+    n = libnet_pblock_append(l, p, (u_int8_t *)&n, sizeof(bgp_id));
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    n = libnet_pblock_append(l, p, (u_int8_t *)&opt_len, sizeof(opt_len));
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    if ((payload && !payload_s) || (!payload && payload_s))
+    {
+         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
+			     "%s(): payload inconsistency\n", __func__);
+        goto bad;
+    }
+
+    if (payload && payload_s)
+    {
+        n = libnet_pblock_append(l, p, payload, payload_s);
+        if (n == -1)
+        {
+            /* err msg set in libnet_pblock_append() */
+            goto bad;
+        }
+    }
+    
+    return (ptag ? ptag : libnet_pblock_update(l, p, h,
+           LIBNET_PBLOCK_BGP4_OPEN_H));
+bad:
+    libnet_pblock_delete(l, p);
+    return (-1);
+}
+
+libnet_ptag_t
+libnet_build_bgp4_update(u_int16_t unfeasible_rt_len, u_int8_t *withdrawn_rt,
+            u_int16_t total_path_attr_len, u_int8_t *path_attributes,
+	    u_int16_t info_len, u_int8_t *reachability_info,
+	    u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
+{
+    u_int32_t n, h;
+    libnet_pblock_t *p;
+    u_int16_t length;
+
+    if (l == NULL)
+    { 
+        return (-1);
+    } 
+
+    /* size of memory block */
+    n = LIBNET_BGP4_UPDATE_H + unfeasible_rt_len + total_path_attr_len +
+            info_len + payload_s;
+
+    /* BGP msg have no checksum */
+    h = 0;                                  
+
+    /*
+     *  Find the existing protocol block if a ptag is specified, or create
+     *  a new one.
+     */
+    p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_BGP4_UPDATE_H);
+    if (p == NULL)
+    {
+        return (-1);
+    }
+
+    /* for memory alignment reason, we need to append each field separately */
+    length = htons(unfeasible_rt_len);
+    n = libnet_pblock_append(l, p, (u_int8_t *)&length, 
+            sizeof (unfeasible_rt_len));
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    if (unfeasible_rt_len && withdrawn_rt)
+    {
+	n = libnet_pblock_append(l, p, withdrawn_rt, unfeasible_rt_len);
+	if (n == -1)
+	{
+	    goto bad;
+	}
+    }
+
+    length = htons(total_path_attr_len);
+    n = libnet_pblock_append(l, p, (u_int8_t *)&length,
+            sizeof (total_path_attr_len));
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    if (total_path_attr_len && path_attributes)
+    {
+	n = libnet_pblock_append(l, p, path_attributes, total_path_attr_len);
+	if (n == -1)
+	{
+	    goto bad;
+	}
+    }
+
+    if (info_len && reachability_info)
+    {
+	n = libnet_pblock_append(l, p, reachability_info, info_len);
+	if (n == -1)
+	{
+	    goto bad;
+	}
+    }
+
+    if ((payload && !payload_s) || (!payload && payload_s))
+    {
+         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
+			     "%s(): payload inconsistency\n", __func__);
+        goto bad;
+    }
+
+    if (payload && payload_s)
+    {
+        n = libnet_pblock_append(l, p, payload, payload_s);
+        if (n == -1)
+        {
+            /* err msg set in libnet_pblock_append() */
+            goto bad;
+        }
+    }
+    
+    return (ptag ? ptag : libnet_pblock_update(l, p, h,
+            LIBNET_PBLOCK_BGP4_UPDATE_H));
+bad:
+    libnet_pblock_delete(l, p);
+    return (-1);
+}
+
+libnet_ptag_t
+libnet_build_bgp4_notification(u_int8_t err_code, u_int8_t err_subcode,
+	    u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
+{
+    u_int32_t n, h;
+    libnet_pblock_t *p;
+    struct libnet_bgp4_notification_hdr bgp4_hdr;
+
+    if (l == NULL)
+    { 
+        return (-1);
+    } 
+
+    n =  LIBNET_BGP4_NOTIFICATION_H + + payload_s;    /* size of memory block */
+    h = 0; 
+
+    /*
+     *  Find the existing protocol block if a ptag is specified, or create
+     *  a new one.
+     */
+    p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_BGP4_NOTIFICATION_H);
+    if (p == NULL)
+    {
+        return (-1);
+    }
+
+	memset(&bgp4_hdr, 0, sizeof(bgp4_hdr));
+	bgp4_hdr.err_code    = err_code;
+    bgp4_hdr.err_subcode = err_subcode;
+
+    n = libnet_pblock_append(l, p, (u_int8_t *)&bgp4_hdr,
+            LIBNET_BGP4_NOTIFICATION_H);
+    if (n == -1)
+    {
+        goto bad;
+    }
+
+    if ((payload && !payload_s) || (!payload && payload_s))
+    {
+         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
+			     "%s(): payload inconsistency\n", __func__);
+        goto bad;
+    }
+
+    if (payload && payload_s)
+    {
+        n = libnet_pblock_append(l, p, payload, payload_s);
+        if (n == -1)
+        {
+            /* err msg set in libnet_pblock_append() */
+            goto bad;
+        }
+    }
+    
+    return (ptag ? ptag : libnet_pblock_update(l, p, h,
+            LIBNET_PBLOCK_BGP4_NOTIFICATION_H));
+bad:
+    libnet_pblock_delete(l, p);
+    return (-1);
+}
+
+/* EOF */