Annotation of embedaddon/libnet/src/libnet_link_pf.c, revision 1.1.1.3
1.1 misho 1: /*
2: * $Id: libnet_link_pf.c,v 1.3 2004/01/03 20:31:02 mike Exp $
3: *
4: * libnet
5: * libnet_pf.c - pf routines
6: *
7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
8: * All rights reserved.
9: *
10: * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
11: * The Regents of the University of California. All rights reserved.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that: (1) source code distributions
15: * retain the above copyright notice and this paragraph in its entirety, (2)
16: * distributions including binary code include the above copyright notice and
17: * this paragraph in its entirety in the documentation or other materials
18: * provided with the distribution, and (3) all advertising materials mentioning
19: * features or use of this software display the following acknowledgement:
20: * ``This product includes software developed by the University of California,
21: * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
22: * the University nor the names of its contributors may be used to endorse
23: * or promote products derived from this software without specific prior
24: * written permission.
25: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
26: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
27: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
28: *
29: * packet filter subroutines for tcpdump
30: * Extraction/creation by Jeffrey Mogul, DECWRL
31: */
32:
1.1.1.3 ! misho 33: #include "common.h"
1.1 misho 34:
35: #include "../include/gnuc.h"
36: #ifdef HAVE_OS_PROTO_H
37: #include "../include/os-proto.h"
38: #endif
39:
40: struct libnet_link_int *
41: libnet_open_link_interface(int8_t *device, int8_t *ebuf)
42: {
43: register struct libnet_link_int *l;
44: int16_t enmode;
45: int backlog = -1; /* request the most */
46: struct enfilter Filter;
47: struct endevp devparams;
48:
49: l = (struct libnet_link_int *)malloc(sizeof(*l));
50: if (l == NULL)
51: {
1.1.1.3 ! misho 52: snprintf(ebuf, LIBNET_ERRBUF_SIZE,
! 53: "libnet_open_link_int: %s", strerror(errno));
1.1 misho 54: return (0);
55: }
56: memset(l, 0, sizeof(*l));
57: l->fd = pfopen(device, O_RDWR);
58: if (l->fd < 0)
59: {
1.1.1.3 ! misho 60: snprintf(ebuf, LIBNET_ERRBUF_SIZE,
! 61: "pf open: %s: %s\nyour system may not be properly configured; see \"man packetfilter(4)\"",
1.1 misho 62: device, strerror(errno));
63: goto bad;
64: }
65:
66: enmode = ENTSTAMP|ENBATCH|ENNONEXCL;
67: if (ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode) < 0)
68: {
1.1.1.3 ! misho 69: snprintf(ebuf, LIBNET_ERRBUF_SIZE,
! 70: "EIOCMBIS: %s", strerror(errno));
1.1 misho 71: goto bad;
72: }
73: #ifdef ENCOPYALL
74: /* Try to set COPYALL mode so that we see packets to ourself */
75: enmode = ENCOPYALL;
76: ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode); /* OK if this fails */
77: #endif
78: /* set the backlog */
79: if (ioctl(l->fd, EIOCSETW, (caddr_t)&backlog) < 0)
80: {
1.1.1.3 ! misho 81: snprintf(ebuf, LIBNET_ERRBUF_SIZE,
! 82: "EIOCSETW: %s", strerror(errno));
1.1 misho 83: goto bad;
84: }
85: /*
86: * discover interface type
87: */
88: if (ioctl(l->fd, EIOCDEVP, (caddr_t)&devparams) < 0)
89: {
1.1.1.3 ! misho 90: snprintf(ebuf, LIBNET_ERRBUF_SIZE,
! 91: "EIOCDEVP: %s", strerror(errno));
1.1 misho 92: goto bad;
93: }
94:
95: /* HACK: to compile prior to Ultrix 4.2 */
96: #ifndef ENDT_FDDI
97: #define ENDT_FDDI 4
98: #endif
99: switch (devparams.end_dev_type)
100: {
101: case ENDT_10MB:
102: l->linktype = DLT_EN10MB;
103: break;
104: case ENDT_FDDI:
105: l->linktype = DLT_FDDI;
106: break;
107: default:
108: /*
109: * XXX
110: * Currently, the Ultrix packet filter supports only
111: * Ethernet and FDDI. Eventually, support for SLIP and PPP
112: * (and possibly others: T1?) should be added.
113: */
114: l->linktype = DLT_EN10MB;
115: break;
116: }
117: /*
118: * acceptag all packets
119: */
120: bzero((int8_t *)&Filter, sizeof(Filter));
121: Filter.enf_Priority = 37; /* anything > 2 */
122: Filter.enf_FilterLen = 0; /* means "always true" */
123: if (ioctl(l->fd, EIOCSETF, (caddr_t)&Filter) < 0)
124: {
1.1.1.3 ! misho 125: snprintf(ebuf, LIBNET_ERRBUF_SIZE,
! 126: "EIOCSETF: %s", strerror(errno));
1.1 misho 127: goto bad;
128: }
129:
130: return (l);
131: bad:
132: free(l);
133: return (NULL);
134: }
135:
136:
137: int
138: libnet_close_link_interface(struct libnet_link_int *l)
139: {
140: if (close(l->fd) == 0)
141: {
142: free(l);
143: return (1);
144: }
145: else
146: {
147: free(l);
148: return (-1);
149: }
150: }
151:
152:
153: int
154: libnet_write_link_layer(struct libnet_link_int *l, const int8_t *device,
1.1.1.2 misho 155: const uint8_t *buf, int len)
1.1 misho 156: {
157: int c;
158:
159: c = write(l->fd, buf, len);
160: if (c != len)
161: {
162: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
1.1.1.3 ! misho 163: "libnet_write_link: %d bytes written (%s)", c,
1.1 misho 164: strerror(errno));
165: }
166: return (c);
167: }
1.1.1.3 ! misho 168:
! 169: /**
! 170: * Local Variables:
! 171: * indent-tabs-mode: nil
! 172: * c-file-style: "stroustrup"
! 173: * End:
! 174: */
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