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1.1.6

    1: /*
    2:  *  $Id: libnet_build_dhcp.c,v 1.1.1.2 2013/07/22 11:54:42 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_dhcp.c - DHCP/BOOTP packet assembler
    6:  *
    7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    8:  *  All rights reserved.
    9:  *
   10:  * Redistribution and use in source and binary forms, with or without
   11:  * modification, are permitted provided that the following conditions
   12:  * are met:
   13:  * 1. Redistributions of source code must retain the above copyright
   14:  *    notice, this list of conditions and the following disclaimer.
   15:  * 2. Redistributions in binary form must reproduce the above copyright
   16:  *    notice, this list of conditions and the following disclaimer in the
   17:  *    documentation and/or other materials provided with the distribution.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  *
   31:  */
   32: 
   33: #if (HAVE_CONFIG_H)
   34: #include "../include/config.h"
   35: #endif
   36: #if (!(_WIN32) || (__CYGWIN__)) 
   37: #include "../include/libnet.h"
   38: #else
   39: #include "../include/win32/libnet.h"
   40: #endif
   41: 
   42: libnet_ptag_t
   43: libnet_build_dhcpv4(uint8_t opcode, uint8_t htype, uint8_t hlen, 
   44: uint8_t hopcount, uint32_t xid, uint16_t secs, uint16_t flags,
   45: uint32_t cip, uint32_t yip, uint32_t sip, uint32_t gip, const uint8_t *chaddr,
   46: const char *sname, const char *file, const uint8_t *payload, uint32_t payload_s,
   47: libnet_t *l, libnet_ptag_t ptag)
   48: {
   49:     uint32_t n, h;
   50:     libnet_pblock_t *p; 
   51:     struct libnet_dhcpv4_hdr dhcp_hdr;
   52: 
   53:     if (l == NULL)
   54:     { 
   55:         return (-1);
   56:     } 
   57: 
   58:     n = LIBNET_DHCPV4_H + payload_s;
   59:     h = 0;          /* no checksum */
   60:  
   61:     /*
   62:      *  Find the existing protocol block if a ptag is specified, or create
   63:      *  a new one.
   64:      */
   65:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_DHCPV4_H);
   66:     if (p == NULL)
   67:     {
   68:         return (-1);
   69:     }
   70: 
   71:     memset(&dhcp_hdr, 0, sizeof(dhcp_hdr));
   72:     dhcp_hdr.dhcp_opcode    = opcode;
   73:     dhcp_hdr.dhcp_htype     = htype;
   74:     dhcp_hdr.dhcp_hlen      = hlen;
   75:     dhcp_hdr.dhcp_hopcount  = hopcount;
   76:     dhcp_hdr.dhcp_xid       = htonl(xid);
   77:     dhcp_hdr.dhcp_secs      = htons(secs);
   78:     dhcp_hdr.dhcp_flags     = htons(flags);
   79:     dhcp_hdr.dhcp_cip       = htonl(cip);
   80:     dhcp_hdr.dhcp_yip       = htonl(yip);
   81:     dhcp_hdr.dhcp_sip       = htonl(sip);
   82:     dhcp_hdr.dhcp_gip       = htonl(gip);
   83: 
   84:     if (chaddr)
   85:     {
   86:         size_t n = sizeof (dhcp_hdr.dhcp_chaddr);
   87:         if (hlen < n)
   88:             n = hlen;
   89:         memcpy(dhcp_hdr.dhcp_chaddr, chaddr, n);
   90:     }
   91:     if (sname)
   92:     { 
   93:         strncpy(dhcp_hdr.dhcp_sname, sname, sizeof (dhcp_hdr.dhcp_sname) - 1);
   94:     }
   95:     if (file)
   96:     {
   97:         strncpy(dhcp_hdr.dhcp_file, file, sizeof (dhcp_hdr.dhcp_file) - 1);
   98:     }
   99:     dhcp_hdr.dhcp_magic = htonl(DHCP_MAGIC);
  100: 
  101:     n = libnet_pblock_append(l, p, (uint8_t *)&dhcp_hdr, LIBNET_DHCPV4_H);
  102:     if (n == -1)
  103:     {
  104:         goto bad;
  105:     }
  106: 
  107:     if (payload_s && !payload)
  108:     {
  109:          snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
  110:                  "%s(): payload inconsistency\n", __func__);
  111:         goto bad;
  112:     }
  113:  
  114:     if (payload_s)
  115:     {
  116:         n = libnet_pblock_append(l, p, payload, payload_s);
  117:         if (n == -1)
  118:         {
  119:             goto bad;
  120:         }
  121:     }
  122:  
  123:     return (ptag ? ptag : libnet_pblock_update(l, p, h, 
  124:             LIBNET_PBLOCK_DHCPV4_H));
  125: bad:
  126:     libnet_pblock_delete(l, p);
  127:     return (-1);
  128: }
  129: 
  130: libnet_ptag_t
  131: libnet_build_bootpv4(uint8_t opcode, uint8_t htype, uint8_t hlen,
  132: uint8_t hopcount, uint32_t xid, uint16_t secs, uint16_t flags,
  133: uint32_t cip, uint32_t yip, uint32_t sip, uint32_t gip, const uint8_t *chaddr,
  134: const char *sname, const char *file, const uint8_t *payload, uint32_t payload_s,
  135: libnet_t *l, libnet_ptag_t ptag)
  136: {
  137:     return (libnet_build_dhcpv4(opcode, htype, hlen, hopcount, xid, secs,
  138:         flags, cip, yip, sip, gip, chaddr, sname, file, payload, payload_s, 
  139:         l, ptag));
  140: }
  141: 
  142: /* EOF */