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86530b38 AT |
1 | /* |
2 | * libnet | |
3 | * libnet_build_sebek.c - sebek packet assembler | |
4 | * | |
5 | * Copyright (c) 2004 Frederic Raynal <pappy@security-labs.org> | |
6 | * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> | |
7 | * All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
28 | * SUCH DAMAGE. | |
29 | * | |
30 | */ | |
31 | ||
32 | #if (HAVE_CONFIG_H) | |
33 | #include "../include/config.h" | |
34 | #endif | |
35 | #if (!(_WIN32) || (__CYGWIN__)) | |
36 | #include "../include/libnet.h" | |
37 | #else | |
38 | #include "../include/win32/libnet.h" | |
39 | #endif | |
40 | ||
41 | libnet_ptag_t | |
42 | libnet_build_sebek(u_int32_t magic, u_int16_t version, u_int16_t type, | |
43 | u_int32_t counter, u_int32_t time_sec, u_int32_t time_usec, u_int32_t pid, | |
44 | u_int32_t uid, u_int32_t fd, u_int8_t cmd[SEBEK_CMD_LENGTH], u_int32_t length, | |
45 | u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag) | |
46 | { | |
47 | u_int32_t n; | |
48 | libnet_pblock_t *p; | |
49 | struct libnet_sebek_hdr sebek_hdr; | |
50 | ||
51 | if (l == NULL) | |
52 | { | |
53 | return (-1); | |
54 | } | |
55 | ||
56 | n = LIBNET_SEBEK_H + payload_s; /* size of memory block */ | |
57 | ||
58 | /* | |
59 | * Find the existing protocol block if a ptag is specified, or create | |
60 | * a new one. | |
61 | */ | |
62 | p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_SEBEK_H); | |
63 | if (p == NULL) | |
64 | { | |
65 | return (-1); | |
66 | } | |
67 | ||
68 | memset(&sebek_hdr, 0, sizeof(sebek_hdr)); | |
69 | sebek_hdr.magic = htonl(magic); | |
70 | sebek_hdr.version = htons(version); | |
71 | sebek_hdr.type = htons(type); | |
72 | sebek_hdr.counter = htonl(counter); | |
73 | sebek_hdr.time_sec = htonl(time_sec); | |
74 | sebek_hdr.time_usec = htonl(time_usec); | |
75 | sebek_hdr.pid = htonl(pid); | |
76 | sebek_hdr.uid = htonl(uid); | |
77 | sebek_hdr.fd = htonl(fd); | |
78 | memcpy(sebek_hdr.cmd, cmd, SEBEK_CMD_LENGTH*sizeof(u_int8_t)); | |
79 | sebek_hdr.length = htonl(length); | |
80 | ||
81 | n = libnet_pblock_append(l, p, (u_int8_t *)&sebek_hdr, LIBNET_SEBEK_H); | |
82 | if (n == -1) | |
83 | { | |
84 | goto bad; | |
85 | } | |
86 | ||
87 | if ((payload && !payload_s) || (!payload && payload_s)) | |
88 | { | |
89 | snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, | |
90 | "%s(): payload inconsistency\n", __func__); | |
91 | goto bad; | |
92 | } | |
93 | ||
94 | if (payload && payload_s) | |
95 | { | |
96 | n = libnet_pblock_append(l, p, payload, payload_s); | |
97 | if (n == -1) | |
98 | { | |
99 | goto bad; | |
100 | } | |
101 | } | |
102 | ||
103 | return (ptag ? ptag : libnet_pblock_update(l, p, 0, LIBNET_PBLOCK_SEBEK_H)); | |
104 | bad: | |
105 | libnet_pblock_delete(l, p); | |
106 | return (-1); | |
107 | } | |
108 | /* EOF */ |