288 lines
6.6 KiB
C
288 lines
6.6 KiB
C
/*
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* Copyright (c) 1993, 1994, 1995, 1996, 1998
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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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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.32 1999/10/19 15:18:30 itojun Exp $ (LBL)";
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#endif
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#include <sys/param.h> /* optionally get BSD define */
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#include <sys/time.h>
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#include <sys/timeb.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.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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#include "gnuc.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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#include "gencode.h"
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int
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pcap_stats(pcap_t *p, struct pcap_stat *ps)
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{
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struct bpf_stat s;
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if (ioctl(p->fd, BIOCGSTATS, (caddr_t)&s) < 0) {
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sprintf(p->errbuf, "BIOCGSTATS: %s", pcap_strerror(errno));
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return (-1);
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}
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ps->ps_recv = s.bs_recv;
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ps->ps_drop = s.bs_drop;
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return (0);
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}
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int
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pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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{
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int cc;
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int n = 0;
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register u_char *bp, *ep;
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again:
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cc = p->cc;
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if (p->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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/* Don't choke when we get ptraced */
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switch (errno) {
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case EINTR:
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goto again;
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case EWOULDBLOCK:
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return (0);
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#if defined(sun) && !defined(BSD)
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/*
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* Due to a SunOS bug, after 2^31 bytes, the kernel
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* file offset overflows and read fails with EINVAL.
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* The lseek() to 0 will fix things.
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*/
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case EINVAL:
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if (lseek(p->fd, 0L, SEEK_CUR) +
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p->bufsize < 0) {
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(void)lseek(p->fd, 0L, SEEK_SET);
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goto again;
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}
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/* fall through */
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#endif
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}
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sprintf(p->errbuf, "read: %s", 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.
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*/
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#define bhp ((struct bpf_hdr *)bp)
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ep = bp + cc;
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while (bp < ep) {
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register int caplen, hdrlen;
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caplen = bhp->bh_caplen;
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hdrlen = bhp->bh_hdrlen;
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/*
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* XXX A bpf_hdr matches a pcap_pkthdr.
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*/
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(*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
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bp += BPF_WORDALIGN(caplen + hdrlen);
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if (++n >= cnt && cnt > 0) {
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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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#undef bhp
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p->cc = 0;
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return (n);
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}
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static inline int
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bpf_open(pcap_t *p, char *errbuf)
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{
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int fd;
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int n = 0;
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char device[sizeof "/dev/bpf000"];
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/*
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* Go through all the minors and find one that isn't in use.
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*/
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do {
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(void)sprintf(device, "/dev/bpf%d", n++);
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fd = open(device, O_RDONLY);
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} while (fd < 0 && errno == EBUSY);
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/*
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* XXX better message for all minors used
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*/
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if (fd < 0)
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sprintf(errbuf, "%s: %s", device, pcap_strerror(errno));
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return (fd);
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}
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pcap_t *
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pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
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{
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int fd;
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struct ifreq ifr;
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struct bpf_version bv;
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u_int v;
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pcap_t *p;
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p = (pcap_t *)malloc(sizeof(*p));
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if (p == NULL) {
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sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
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return (NULL);
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}
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bzero(p, sizeof(*p));
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fd = bpf_open(p, ebuf);
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if (fd < 0)
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goto bad;
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p->fd = fd;
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p->snapshot = snaplen;
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if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0) {
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sprintf(ebuf, "BIOCVERSION: %s", pcap_strerror(errno));
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goto bad;
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}
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if (bv.bv_major != BPF_MAJOR_VERSION ||
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bv.bv_minor < BPF_MINOR_VERSION) {
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sprintf(ebuf, "kernel bpf filter out of date");
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goto bad;
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}
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v = 32768; /* XXX this should be a user-accessible hook */
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/* Ignore the return value - this is because the call fails on
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* BPF systems that don't have kernel malloc. And if the call
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* fails, it's no big deal, we just continue to use the standard
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* buffer size.
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*/
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(void) ioctl(fd, BIOCSBLEN, (caddr_t)&v);
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(void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
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if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) < 0) {
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sprintf(ebuf, "%s: %s", device, pcap_strerror(errno));
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goto bad;
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}
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/* Get the data link layer type. */
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if (ioctl(fd, BIOCGDLT, (caddr_t)&v) < 0) {
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sprintf(ebuf, "BIOCGDLT: %s", pcap_strerror(errno));
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goto bad;
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}
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#ifdef __OpenBSD__
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switch (v) {
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case DLT_LOOP:
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v = DLT_NULL;
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break;
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}
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#endif
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#if _BSDI_VERSION - 0 >= 199510
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/* The SLIP and PPP link layer header changed in BSD/OS 2.1 */
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switch (v) {
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case DLT_SLIP:
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v = DLT_SLIP_BSDOS;
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break;
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case DLT_PPP:
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v = DLT_PPP_BSDOS;
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break;
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case 11: /*DLT_FR*/
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v = DLT_RAW; /*XXX*/
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break;
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case 12: /*DLT_C_HDLC*/
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v = DLT_CHDLC;
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break;
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}
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#endif
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p->linktype = v;
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/* set timeout */
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if (to_ms != 0) {
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struct timeval to;
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to.tv_sec = to_ms / 1000;
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to.tv_usec = (to_ms * 1000) % 1000000;
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if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&to) < 0) {
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sprintf(ebuf, "BIOCSRTIMEOUT: %s",
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pcap_strerror(errno));
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goto bad;
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}
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}
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if (promisc)
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/* set promiscuous mode, okay if it fails */
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(void)ioctl(p->fd, BIOCPROMISC, NULL);
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if (ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) {
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sprintf(ebuf, "BIOCGBLEN: %s", pcap_strerror(errno));
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goto bad;
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}
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p->bufsize = v;
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p->buffer = (u_char *)malloc(p->bufsize);
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if (p->buffer == NULL) {
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sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
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goto bad;
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}
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return (p);
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bad:
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(void)close(fd);
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free(p);
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return (NULL);
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}
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int
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pcap_setfilter(pcap_t *p, struct bpf_program *fp)
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{
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/*
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* It looks that BPF code generated by gen_protochain() is not
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* compatible with some of kernel BPF code (for example BSD/OS 3.1).
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* Take a safer side for now.
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*/
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if (no_optimize)
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p->fcode = *fp;
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else if (p->sf.rfile != NULL)
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p->fcode = *fp;
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else if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
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sprintf(p->errbuf, "BIOCSETF: %s", pcap_strerror(errno));
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return (-1);
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}
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return (0);
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}
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