Local changes: - In contrib/libpcap/pcap/bpf.h, do not include pcap/dlt.h. Our system net/dlt.h is pulled in from net/bpf.h. - sys/net/dlt.h: Incorporate changes from libpcap 1.10.3. - lib/libpcap/Makefile: Update for libpcap 1.10.3. Changelog: https://git.tcpdump.org/libpcap/blob/95691ebe7564afa3faa5c6ba0dbd17e351be455a:/CHANGES Reviewed by: emaste Obtained from: https://www.tcpdump.org/release/libpcap-1.10.3.tar.gz Sponsored by: The FreeBSD Foundation
513 lines
13 KiB
C
513 lines
13 KiB
C
/*
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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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* Modifications made to accommodate the new SunOS4.0 NIT facility by
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* Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989.
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* This module now handles the STREAMS based NIT.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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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/dir.h>
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#include <sys/fcntlcom.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 <sys/stropts.h>
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#include <net/if.h>
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#include <net/nit.h>
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#include <net/nit_if.h>
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#include <net/nit_pf.h>
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#include <net/nit_buf.h>
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#include <netinet/in.h>
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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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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.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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/*
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* Private data for capturing on STREAMS NIT devices.
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*/
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struct pcap_snit {
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struct pcap_stat stat;
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};
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static int
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pcap_stats_snit(pcap_t *p, struct pcap_stat *ps)
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{
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struct pcap_snit *psn = p->priv;
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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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* "ps_drop" counts packets dropped inside the "/dev/nit"
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* device because of flow control requirements or resource
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* exhaustion; it doesn't count packets dropped by the
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* interface driver, or packets dropped upstream. As filtering
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* is done in userland, it counts packets regardless of whether
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* they would've passed the filter.
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*
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* These statistics don't include packets not yet read from the
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* kernel by libpcap or packets not yet read from libpcap by the
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* application.
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*/
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*ps = psn->stat;
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return (0);
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}
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static int
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pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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{
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struct pcap_snit *psn = p->priv;
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register int cc, n;
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register u_char *bp, *cp, *ep;
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register struct nit_bufhdr *hdrp;
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register struct nit_iftime *ntp;
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register struct nit_iflen *nlp;
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register struct nit_ifdrops *ndp;
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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);
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pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
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errno, "pcap_read");
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return (-1);
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}
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bp = (u_char *)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 snapshot in the chunk
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*
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* This assumes that a single buffer of packets will have
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* <= INT_MAX packets, so the packet count doesn't overflow.
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*/
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n = 0;
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ep = bp + cc;
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while (bp < ep) {
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/*
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* Has "pcap_breakloop()" been called?
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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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* 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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} else {
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p->bp = bp;
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p->cc = ep - bp;
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return (n);
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}
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}
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++psn->stat.ps_recv;
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cp = bp;
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/* get past NIT buffer */
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hdrp = (struct nit_bufhdr *)cp;
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cp += sizeof(*hdrp);
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/* get past NIT timer */
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ntp = (struct nit_iftime *)cp;
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cp += sizeof(*ntp);
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ndp = (struct nit_ifdrops *)cp;
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psn->stat.ps_drop = ndp->nh_drops;
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cp += sizeof *ndp;
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/* get past packet len */
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nlp = (struct nit_iflen *)cp;
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cp += sizeof(*nlp);
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/* next snapshot */
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bp += hdrp->nhb_totlen;
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caplen = nlp->nh_pktlen;
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if (caplen > p->snapshot)
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caplen = p->snapshot;
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if (pcap_filter(p->fcode.bf_insns, cp, nlp->nh_pktlen, caplen)) {
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struct pcap_pkthdr h;
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h.ts = ntp->nh_timestamp;
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h.len = nlp->nh_pktlen;
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h.caplen = caplen;
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(*callback)(user, &h, cp);
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if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
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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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}
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p->cc = 0;
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return (n);
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}
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static int
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pcap_inject_snit(pcap_t *p, const void *buf, int size)
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{
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struct strbuf ctl, data;
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/*
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* XXX - can we just do
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*
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ret = write(pd->f, buf, size);
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*/
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ctl.len = sizeof(*sa); /* XXX - what was this? */
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ctl.buf = (char *)sa;
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data.buf = buf;
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data.len = size;
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ret = putmsg(p->fd, &ctl, &data);
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if (ret == -1) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "send");
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return (-1);
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}
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return (ret);
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}
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static int
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nit_setflags(pcap_t *p)
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{
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bpf_u_int32 flags;
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struct strioctl si;
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u_int zero = 0;
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struct timeval timeout;
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if (p->opt.immediate) {
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/*
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* Set the chunk size to zero, so that chunks get sent
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* up immediately.
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*/
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si.ic_cmd = NIOCSCHUNK;
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si.ic_len = sizeof(zero);
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si.ic_dp = (char *)&zero;
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if (ioctl(p->fd, I_STR, (char *)&si) < 0) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "NIOCSCHUNK");
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return (-1);
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}
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}
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si.ic_timout = INFTIM;
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if (p->opt.timeout != 0) {
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timeout.tv_sec = p->opt.timeout / 1000;
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timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;
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si.ic_cmd = NIOCSTIME;
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si.ic_len = sizeof(timeout);
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si.ic_dp = (char *)&timeout;
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if (ioctl(p->fd, I_STR, (char *)&si) < 0) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "NIOCSTIME");
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return (-1);
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}
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}
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flags = NI_TIMESTAMP | NI_LEN | NI_DROPS;
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if (p->opt.promisc)
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flags |= NI_PROMISC;
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si.ic_cmd = NIOCSFLAGS;
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si.ic_len = sizeof(flags);
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si.ic_dp = (char *)&flags;
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if (ioctl(p->fd, I_STR, (char *)&si) < 0) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "NIOCSFLAGS");
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return (-1);
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}
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return (0);
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}
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static int
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pcap_activate_snit(pcap_t *p)
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{
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struct strioctl si; /* struct for ioctl() */
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struct ifreq ifr; /* interface request struct */
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int chunksize = CHUNKSIZE;
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int fd;
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static const char dev[] = "/dev/nit";
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int err;
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if (p->opt.rfmon) {
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/*
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* No monitor mode on SunOS 4.x (no Wi-Fi devices on
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* hardware supported by SunOS 4.x).
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*/
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return (PCAP_ERROR_RFMON_NOTSUP);
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}
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/*
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* Turn a negative snapshot value (invalid), a snapshot value of
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* 0 (unspecified), or a value bigger than the normal maximum
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* value, into the maximum allowed value.
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*
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* If some application really *needs* a bigger snapshot
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* length, we should just increase MAXIMUM_SNAPLEN.
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*/
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if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
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p->snapshot = MAXIMUM_SNAPLEN;
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if (p->snapshot < 96)
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/*
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* NIT requires a snapshot length of at least 96.
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*/
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p->snapshot = 96;
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/*
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* Initially try a read/write open (to allow the inject
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* method to work). If that fails due to permission
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* issues, fall back to read-only. This allows a
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* non-root user to be granted specific access to pcap
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* capabilities via file permissions.
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*
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* XXX - we should have an API that has a flag that
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* controls whether to open read-only or read-write,
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* so that denial of permission to send (or inability
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* to send, if sending packets isn't supported on
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* the device in question) can be indicated at open
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* time.
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*/
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p->fd = fd = open(dev, O_RDWR);
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if (fd < 0 && errno == EACCES)
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p->fd = fd = open(dev, O_RDONLY);
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if (fd < 0) {
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if (errno == EACCES) {
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err = PCAP_ERROR_PERM_DENIED;
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"Attempt to open %s failed with EACCES - root privileges may be required",
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dev);
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} else {
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err = PCAP_ERROR;
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "%s", dev);
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}
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goto bad;
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}
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/* arrange to get discrete messages from the STREAM and use NIT_BUF */
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if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "I_SRDOPT");
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err = PCAP_ERROR;
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goto bad;
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}
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if (ioctl(fd, I_PUSH, "nbuf") < 0) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "push nbuf");
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err = PCAP_ERROR;
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goto bad;
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}
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/* set the chunksize */
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si.ic_cmd = NIOCSCHUNK;
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si.ic_timout = INFTIM;
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si.ic_len = sizeof(chunksize);
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si.ic_dp = (char *)&chunksize;
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if (ioctl(fd, I_STR, (char *)&si) < 0) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "NIOCSCHUNK");
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err = PCAP_ERROR;
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goto bad;
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}
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/* request the interface */
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strncpy(ifr.ifr_name, p->opt.device, sizeof(ifr.ifr_name));
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ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
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si.ic_cmd = NIOCBIND;
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si.ic_len = sizeof(ifr);
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si.ic_dp = (char *)𝔦
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if (ioctl(fd, I_STR, (char *)&si) < 0) {
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/*
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* XXX - is there an error that means "no such device"?
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* Is there one that means "that device doesn't support
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* STREAMS NIT"?
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*/
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "NIOCBIND: %s", ifr.ifr_name);
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err = PCAP_ERROR;
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goto bad;
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}
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/* set the snapshot length */
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si.ic_cmd = NIOCSSNAP;
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si.ic_len = sizeof(p->snapshot);
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si.ic_dp = (char *)&p->snapshot;
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if (ioctl(fd, I_STR, (char *)&si) < 0) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "NIOCSSNAP");
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err = PCAP_ERROR;
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goto bad;
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}
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if (nit_setflags(p) < 0) {
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err = PCAP_ERROR;
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goto bad;
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}
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(void)ioctl(fd, I_FLUSH, (char *)FLUSHR);
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/*
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* NIT supports only ethernets.
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*/
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p->linktype = DLT_EN10MB;
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p->bufsize = BUFSPACE;
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p->buffer = malloc(p->bufsize);
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if (p->buffer == NULL) {
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pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
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errno, "malloc");
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err = PCAP_ERROR;
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goto bad;
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}
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/*
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* "p->fd" is an FD for a STREAMS device, so "select()" and
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* "poll()" should work on it.
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*/
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p->selectable_fd = p->fd;
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/*
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* This is (presumably) a real Ethernet capture; give it a
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* link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
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* that an application can let you choose it, in case you're
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* capturing DOCSIS traffic that a Cisco Cable Modem
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* Termination System is putting out onto an Ethernet (it
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* doesn't put an Ethernet header onto the wire, it puts raw
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* DOCSIS frames out on the wire inside the low-level
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* Ethernet framing).
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*/
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p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
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/*
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* If that fails, just leave the list empty.
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*/
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if (p->dlt_list != NULL) {
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p->dlt_list[0] = DLT_EN10MB;
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p->dlt_list[1] = DLT_DOCSIS;
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p->dlt_count = 2;
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}
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p->read_op = pcap_read_snit;
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p->inject_op = pcap_inject_snit;
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p->setfilter_op = install_bpf_program; /* no kernel filtering */
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p->setdirection_op = NULL; /* Not implemented. */
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p->set_datalink_op = NULL; /* can't change data link type */
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p->getnonblock_op = pcap_getnonblock_fd;
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p->setnonblock_op = pcap_setnonblock_fd;
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p->stats_op = pcap_stats_snit;
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return (0);
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bad:
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pcap_cleanup_live_common(p);
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return (err);
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}
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pcap_t *
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pcap_create_interface(const char *device _U_, char *ebuf)
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{
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pcap_t *p;
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p = PCAP_CREATE_COMMON(ebuf, struct pcap_snit);
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if (p == NULL)
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return (NULL);
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p->activate_op = pcap_activate_snit;
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return (p);
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}
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/*
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* XXX - there's probably a NIOCBIND error that means "that device
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* doesn't support NIT"; if so, we should try an NIOCBIND and use that.
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*/
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static int
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can_be_bound(const char *name _U_)
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{
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return (1);
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}
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static int
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get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)
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{
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/*
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* Nothing we can do.
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* XXX - is there a way to find out whether an adapter has
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* something plugged into it?
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*/
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return (0);
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}
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|
|
|
int
|
|
pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf)
|
|
{
|
|
return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound,
|
|
get_if_flags));
|
|
}
|
|
|
|
/*
|
|
* Libpcap version string.
|
|
*/
|
|
const char *
|
|
pcap_lib_version(void)
|
|
{
|
|
return (PCAP_VERSION_STRING);
|
|
}
|