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: */
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