1996-08-19 20:36:34 +00:00
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/*
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* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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2004-03-31 09:07:39 +00:00
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static const char rcsid[] _U_ =
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2009-03-21 20:43:56 +00:00
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"@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.58.2.4 2008-04-14 20:41:52 guy Exp $ (LBL)";
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2001-04-03 04:18:09 +00:00
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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1996-08-19 20:36:34 +00:00
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|
#endif
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/timeb.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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|
|
#include <net/nit.h>
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#include <netinet/in.h>
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|
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/if_ether.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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|
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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include "pcap-int.h"
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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/*
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* The chunk size for NIT. This is the amount of buffering
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* done for read calls.
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*/
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#define CHUNKSIZE (2*1024)
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/*
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* The total buffer space used by NIT.
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*/
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#define BUFSPACE (4*CHUNKSIZE)
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/* Forwards */
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static int nit_setflags(int, int, int, char *);
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|
2004-03-31 09:07:39 +00:00
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static int
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pcap_stats_nit(pcap_t *p, struct pcap_stat *ps)
|
1996-08-19 20:36:34 +00:00
|
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|
{
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|
2002-06-21 01:36:27 +00:00
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/*
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* "ps_recv" counts packets handed to the filter, not packets
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* that passed the filter. As filtering is done in userland,
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* this does not include packets dropped because we ran out
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* of buffer space.
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*
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|
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* "ps_drop" presumably counts packets dropped by the socket
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* because of flow control requirements or resource exhaustion;
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* it doesn't count packets dropped by the interface driver.
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* As filtering is done in userland, it counts packets regardless
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* of whether they would've passed the filter.
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*
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|
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* These statistics don't include packets not yet read from the
|
|
|
|
* kernel by libpcap or packets not yet read from libpcap by the
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|
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* application.
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|
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*/
|
1996-08-19 20:36:34 +00:00
|
|
|
*ps = p->md.stat;
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|
return (0);
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|
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}
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|
2004-03-31 09:07:39 +00:00
|
|
|
static int
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pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
1996-08-19 20:36:34 +00:00
|
|
|
{
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|
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register int cc, n;
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register u_char *bp, *cp, *ep;
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|
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register struct nit_hdr *nh;
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|
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register int caplen;
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cc = p->cc;
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if (cc == 0) {
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cc = read(p->fd, (char *)p->buffer, p->bufsize);
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|
|
if (cc < 0) {
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|
|
if (errno == EWOULDBLOCK)
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|
|
return (0);
|
2001-04-03 04:18:09 +00:00
|
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|
snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
|
1996-08-19 20:36:34 +00:00
|
|
|
pcap_strerror(errno));
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|
|
return (-1);
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|
}
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bp = p->buffer;
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} else
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bp = p->bp;
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/*
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|
|
* Loop through each packet. The increment expression
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* rounds up to the next int boundary past the end of
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|
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* the previous packet.
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|
*/
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|
n = 0;
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ep = bp + cc;
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|
while (bp < ep) {
|
2004-03-31 09:07:39 +00:00
|
|
|
/*
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* Has "pcap_breakloop()" been called?
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|
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* If so, return immediately - if we haven't read any
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* packets, clear the flag and return -2 to indicate
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* that we were told to break out of the loop, otherwise
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* leave the flag set, so that the *next* call will break
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* out of the loop without having read any packets, and
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|
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* return the number of packets we've processed so far.
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|
*/
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|
|
if (p->break_loop) {
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|
|
if (n == 0) {
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p->break_loop = 0;
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|
return (-2);
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|
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} else {
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p->cc = ep - bp;
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p->bp = bp;
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|
return (n);
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}
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}
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|
1996-08-19 20:36:34 +00:00
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|
nh = (struct nit_hdr *)bp;
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cp = bp + sizeof(*nh);
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switch (nh->nh_state) {
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case NIT_CATCH:
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break;
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case NIT_NOMBUF:
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case NIT_NOCLUSTER:
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case NIT_NOSPACE:
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p->md.stat.ps_drop = nh->nh_dropped;
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continue;
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case NIT_SEQNO:
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continue;
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default:
|
2001-04-03 04:18:09 +00:00
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snprintf(p->errbuf, sizeof(p->errbuf),
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"bad nit state %d", nh->nh_state);
|
1996-08-19 20:36:34 +00:00
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return (-1);
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}
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++p->md.stat.ps_recv;
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bp += ((sizeof(struct nit_hdr) + nh->nh_datalen +
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|
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sizeof(int) - 1) & ~(sizeof(int) - 1));
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caplen = nh->nh_wirelen;
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if (caplen > p->snapshot)
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caplen = p->snapshot;
|
2009-03-21 20:43:56 +00:00
|
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|
if (bpf_filter(p->fcode.bf_insns, cp, nh->nh_wirelen, caplen)) {
|
1996-08-19 20:36:34 +00:00
|
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|
struct pcap_pkthdr h;
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|
h.ts = nh->nh_timestamp;
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|
h.len = nh->nh_wirelen;
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h.caplen = caplen;
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|
|
(*callback)(user, &h, cp);
|
2009-03-21 20:43:56 +00:00
|
|
|
if (++n >= cnt && cnt > 0) {
|
1996-08-19 20:36:34 +00:00
|
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|
p->cc = ep - bp;
|
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|
|
p->bp = bp;
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|
|
return (n);
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|
|
|
}
|
|
|
|
}
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|
|
}
|
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|
|
p->cc = 0;
|
|
|
|
return (n);
|
|
|
|
}
|
|
|
|
|
2005-05-29 17:46:52 +00:00
|
|
|
static int
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|
|
pcap_inject_nit(pcap_t *p, const void *buf, size_t size)
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|
|
|
{
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|
|
|
struct sockaddr sa;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
|
|
strncpy(sa.sa_data, device, sizeof(sa.sa_data));
|
|
|
|
ret = sendto(p->fd, buf, size, 0, &sa, sizeof(sa));
|
|
|
|
if (ret == -1) {
|
|
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send: %s",
|
|
|
|
pcap_strerror(errno));
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
return (ret);
|
|
|
|
}
|
|
|
|
|
1996-08-19 20:36:34 +00:00
|
|
|
static int
|
|
|
|
nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
|
|
|
|
{
|
|
|
|
struct nit_ioc nioc;
|
|
|
|
|
2001-04-03 04:18:09 +00:00
|
|
|
memset(&nioc, 0, sizeof(nioc));
|
1996-08-19 20:36:34 +00:00
|
|
|
nioc.nioc_bufspace = BUFSPACE;
|
|
|
|
nioc.nioc_chunksize = CHUNKSIZE;
|
|
|
|
nioc.nioc_typetomatch = NT_ALLTYPES;
|
|
|
|
nioc.nioc_snaplen = p->snapshot;
|
|
|
|
nioc.nioc_bufalign = sizeof(int);
|
|
|
|
nioc.nioc_bufoffset = 0;
|
|
|
|
|
|
|
|
if (to_ms != 0) {
|
|
|
|
nioc.nioc_flags |= NF_TIMEOUT;
|
|
|
|
nioc.nioc_timeout.tv_sec = to_ms / 1000;
|
|
|
|
nioc.nioc_timeout.tv_usec = (to_ms * 1000) % 1000000;
|
|
|
|
}
|
|
|
|
if (promisc)
|
|
|
|
nioc.nioc_flags |= NF_PROMISC;
|
|
|
|
|
|
|
|
if (ioctl(fd, SIOCSNIT, &nioc) < 0) {
|
2001-04-03 04:18:09 +00:00
|
|
|
snprintf(ebuf, PCAP_ERRBUF_SIZE, "SIOCSNIT: %s",
|
|
|
|
pcap_strerror(errno));
|
1996-08-19 20:36:34 +00:00
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2009-03-21 20:43:56 +00:00
|
|
|
static int
|
|
|
|
pcap_activate_nit(pcap_t *p)
|
1996-08-19 20:36:34 +00:00
|
|
|
{
|
|
|
|
int fd;
|
|
|
|
struct sockaddr_nit snit;
|
|
|
|
|
2009-03-21 20:43:56 +00:00
|
|
|
if (p->opt.rfmon) {
|
|
|
|
/*
|
|
|
|
* No monitor mode on SunOS 3.x or earlier (no
|
|
|
|
* Wi-Fi *devices* for the hardware that supported
|
|
|
|
* them!).
|
|
|
|
*/
|
|
|
|
return (PCAP_ERROR_RFMON_NOTSUP);
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
|
2009-03-21 20:43:56 +00:00
|
|
|
if (p->snapshot < 96)
|
1996-08-19 20:36:34 +00:00
|
|
|
/*
|
|
|
|
* NIT requires a snapshot length of at least 96.
|
|
|
|
*/
|
2009-03-21 20:43:56 +00:00
|
|
|
p->snapshot = 96;
|
1996-08-19 20:36:34 +00:00
|
|
|
|
2001-04-03 04:18:09 +00:00
|
|
|
memset(p, 0, sizeof(*p));
|
1996-08-19 20:36:34 +00:00
|
|
|
p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
|
|
|
|
if (fd < 0) {
|
2009-03-21 20:43:56 +00:00
|
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
2001-04-03 04:18:09 +00:00
|
|
|
"socket: %s", pcap_strerror(errno));
|
1996-08-19 20:36:34 +00:00
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
snit.snit_family = AF_NIT;
|
2009-03-21 20:43:56 +00:00
|
|
|
(void)strncpy(snit.snit_ifname, p->opt.source, NITIFSIZ);
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
|
2009-03-21 20:43:56 +00:00
|
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
2001-04-03 04:18:09 +00:00
|
|
|
"bind: %s: %s", snit.snit_ifname, pcap_strerror(errno));
|
1996-08-19 20:36:34 +00:00
|
|
|
goto bad;
|
|
|
|
}
|
2009-03-21 20:43:56 +00:00
|
|
|
nit_setflags(p->fd, p->opt.promisc, p->md.timeout, p->errbuf);
|
1996-08-19 20:36:34 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* NIT supports only ethernets.
|
|
|
|
*/
|
|
|
|
p->linktype = DLT_EN10MB;
|
|
|
|
|
|
|
|
p->bufsize = BUFSPACE;
|
|
|
|
p->buffer = (u_char *)malloc(p->bufsize);
|
|
|
|
if (p->buffer == NULL) {
|
2009-03-21 20:43:56 +00:00
|
|
|
strlcpy(p->errbuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
|
2005-05-29 17:46:52 +00:00
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
|
2004-03-31 09:07:39 +00:00
|
|
|
/*
|
|
|
|
* "p->fd" is a socket, so "select()" should work on it.
|
|
|
|
*/
|
|
|
|
p->selectable_fd = p->fd;
|
|
|
|
|
2005-05-29 17:46:52 +00:00
|
|
|
/*
|
|
|
|
* This is (presumably) a real Ethernet capture; give it a
|
|
|
|
* link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
|
|
|
|
* that an application can let you choose it, in case you're
|
|
|
|
* capturing DOCSIS traffic that a Cisco Cable Modem
|
|
|
|
* Termination System is putting out onto an Ethernet (it
|
|
|
|
* doesn't put an Ethernet header onto the wire, it puts raw
|
|
|
|
* DOCSIS frames out on the wire inside the low-level
|
|
|
|
* Ethernet framing).
|
|
|
|
*/
|
|
|
|
p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
|
|
|
|
/*
|
|
|
|
* If that fails, just leave the list empty.
|
|
|
|
*/
|
|
|
|
if (p->dlt_list != NULL) {
|
|
|
|
p->dlt_list[0] = DLT_EN10MB;
|
|
|
|
p->dlt_list[1] = DLT_DOCSIS;
|
|
|
|
p->dlt_count = 2;
|
|
|
|
}
|
|
|
|
|
2004-03-31 09:07:39 +00:00
|
|
|
p->read_op = pcap_read_nit;
|
2005-05-29 17:46:52 +00:00
|
|
|
p->inject_op = pcap_inject_nit;
|
2004-03-31 09:07:39 +00:00
|
|
|
p->setfilter_op = install_bpf_program; /* no kernel filtering */
|
2005-07-11 03:24:53 +00:00
|
|
|
p->setdirection_op = NULL; /* Not implemented. */
|
2004-03-31 09:07:39 +00:00
|
|
|
p->set_datalink_op = NULL; /* can't change data link type */
|
|
|
|
p->getnonblock_op = pcap_getnonblock_fd;
|
|
|
|
p->setnonblock_op = pcap_setnonblock_fd;
|
|
|
|
p->stats_op = pcap_stats_nit;
|
|
|
|
|
2009-03-21 20:43:56 +00:00
|
|
|
return (0);
|
1996-08-19 20:36:34 +00:00
|
|
|
bad:
|
2009-03-21 20:43:56 +00:00
|
|
|
return (PCAP_ERROR);
|
|
|
|
}
|
|
|
|
|
|
|
|
pcap_t *
|
|
|
|
pcap_create(const char *device, char *ebuf)
|
|
|
|
{
|
|
|
|
pcap_t *p;
|
|
|
|
|
|
|
|
p = pcap_create_common(device, ebuf);
|
|
|
|
if (p == NULL)
|
|
|
|
return (NULL);
|
|
|
|
|
|
|
|
p->activate_op = pcap_activate_nit;
|
|
|
|
return (p);
|
1996-08-19 20:36:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
2004-03-31 09:07:39 +00:00
|
|
|
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
|
1996-08-19 20:36:34 +00:00
|
|
|
{
|
|
|
|
return (0);
|
|
|
|
}
|