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Annotation of embedaddon/libnet/src/libnet_build_dhcp.c, revision 1.1.1.3

1.1       misho       1: /*
                      2:  *  $Id: libnet_build_dhcp.c,v 1.10 2004/03/01 20:26:12 mike 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: 
1.1.1.3 ! misho      33: #include "common.h"
1.1       misho      34: 
                     35: libnet_ptag_t
1.1.1.2   misho      36: libnet_build_dhcpv4(uint8_t opcode, uint8_t htype, uint8_t hlen, 
                     37: uint8_t hopcount, uint32_t xid, uint16_t secs, uint16_t flags,
                     38: uint32_t cip, uint32_t yip, uint32_t sip, uint32_t gip, const uint8_t *chaddr,
                     39: const char *sname, const char *file, const uint8_t *payload, uint32_t payload_s,
1.1       misho      40: libnet_t *l, libnet_ptag_t ptag)
                     41: {
1.1.1.2   misho      42:     uint32_t n, h;
1.1       misho      43:     libnet_pblock_t *p; 
                     44:     struct libnet_dhcpv4_hdr dhcp_hdr;
                     45: 
                     46:     if (l == NULL)
                     47:     { 
                     48:         return (-1);
                     49:     } 
                     50: 
                     51:     n = LIBNET_DHCPV4_H + payload_s;
                     52:     h = 0;          /* no checksum */
                     53:  
                     54:     /*
                     55:      *  Find the existing protocol block if a ptag is specified, or create
                     56:      *  a new one.
                     57:      */
                     58:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_DHCPV4_H);
                     59:     if (p == NULL)
                     60:     {
                     61:         return (-1);
                     62:     }
                     63: 
                     64:     memset(&dhcp_hdr, 0, sizeof(dhcp_hdr));
                     65:     dhcp_hdr.dhcp_opcode    = opcode;
                     66:     dhcp_hdr.dhcp_htype     = htype;
                     67:     dhcp_hdr.dhcp_hlen      = hlen;
                     68:     dhcp_hdr.dhcp_hopcount  = hopcount;
                     69:     dhcp_hdr.dhcp_xid       = htonl(xid);
                     70:     dhcp_hdr.dhcp_secs      = htons(secs);
                     71:     dhcp_hdr.dhcp_flags     = htons(flags);
                     72:     dhcp_hdr.dhcp_cip       = htonl(cip);
                     73:     dhcp_hdr.dhcp_yip       = htonl(yip);
                     74:     dhcp_hdr.dhcp_sip       = htonl(sip);
                     75:     dhcp_hdr.dhcp_gip       = htonl(gip);
                     76: 
                     77:     if (chaddr)
                     78:     {
1.1.1.2   misho      79:         size_t n = sizeof (dhcp_hdr.dhcp_chaddr);
                     80:         if (hlen < n)
                     81:             n = hlen;
                     82:         memcpy(dhcp_hdr.dhcp_chaddr, chaddr, n);
1.1       misho      83:     }
                     84:     if (sname)
                     85:     { 
1.1.1.2   misho      86:         strncpy(dhcp_hdr.dhcp_sname, sname, sizeof (dhcp_hdr.dhcp_sname) - 1);
1.1       misho      87:     }
                     88:     if (file)
                     89:     {
1.1.1.2   misho      90:         strncpy(dhcp_hdr.dhcp_file, file, sizeof (dhcp_hdr.dhcp_file) - 1);
1.1       misho      91:     }
1.1.1.2   misho      92:     dhcp_hdr.dhcp_magic = htonl(DHCP_MAGIC);
1.1       misho      93: 
1.1.1.2   misho      94:     n = libnet_pblock_append(l, p, (uint8_t *)&dhcp_hdr, LIBNET_DHCPV4_H);
1.1       misho      95:     if (n == -1)
                     96:     {
                     97:         goto bad;
                     98:     }
                     99: 
1.1.1.2   misho     100:     if (payload_s && !payload)
1.1       misho     101:     {
                    102:          snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
1.1.1.3 ! misho     103:                  "%s(): payload inconsistency", __func__);
1.1       misho     104:         goto bad;
                    105:     }
                    106:  
1.1.1.2   misho     107:     if (payload_s)
1.1       misho     108:     {
                    109:         n = libnet_pblock_append(l, p, payload, payload_s);
                    110:         if (n == -1)
                    111:         {
                    112:             goto bad;
                    113:         }
                    114:     }
                    115:  
                    116:     return (ptag ? ptag : libnet_pblock_update(l, p, h, 
                    117:             LIBNET_PBLOCK_DHCPV4_H));
                    118: bad:
                    119:     libnet_pblock_delete(l, p);
                    120:     return (-1);
                    121: }
                    122: 
                    123: libnet_ptag_t
1.1.1.2   misho     124: libnet_build_bootpv4(uint8_t opcode, uint8_t htype, uint8_t hlen,
                    125: uint8_t hopcount, uint32_t xid, uint16_t secs, uint16_t flags,
                    126: uint32_t cip, uint32_t yip, uint32_t sip, uint32_t gip, const uint8_t *chaddr,
                    127: const char *sname, const char *file, const uint8_t *payload, uint32_t payload_s,
1.1       misho     128: libnet_t *l, libnet_ptag_t ptag)
                    129: {
                    130:     return (libnet_build_dhcpv4(opcode, htype, hlen, hopcount, xid, secs,
                    131:         flags, cip, yip, sip, gip, chaddr, sname, file, payload, payload_s, 
                    132:         l, ptag));
                    133: }
                    134: 
1.1.1.3 ! misho     135: /**
        !           136:  * Local Variables:
        !           137:  *  indent-tabs-mode: nil
        !           138:  *  c-file-style: "stroustrup"
        !           139:  * End:
        !           140:  */