268 lines
6.4 KiB
C
268 lines
6.4 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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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.41 2001/12/10 07:14:18 guy Exp $ (LBL)";
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#endif
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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/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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#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 <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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int
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pcap_stats(pcap_t *p, struct pcap_stat *ps)
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{
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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" 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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* 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 = p->md.stat;
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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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register int cc, n;
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register struct bpf_insn *fcode = p->fcode.bf_insns;
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register u_char *bp, *cp, *ep;
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register struct nit_hdr *nh;
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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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snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s",
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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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* 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) {
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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:
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snprintf(p->errbuf, sizeof(p->errbuf),
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"bad nit state %d", nh->nh_state);
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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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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;
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if (bpf_filter(fcode, cp, nh->nh_wirelen, caplen)) {
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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);
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if (++n >= cnt && cnt >= 0) {
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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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nit_setflags(int fd, int promisc, int to_ms, char *ebuf)
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{
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struct nit_ioc nioc;
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memset(&nioc, 0, sizeof(nioc));
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nioc.nioc_bufspace = BUFSPACE;
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nioc.nioc_chunksize = CHUNKSIZE;
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nioc.nioc_typetomatch = NT_ALLTYPES;
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nioc.nioc_snaplen = p->snapshot;
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nioc.nioc_bufalign = sizeof(int);
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nioc.nioc_bufoffset = 0;
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if (to_ms != 0) {
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nioc.nioc_flags |= NF_TIMEOUT;
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nioc.nioc_timeout.tv_sec = to_ms / 1000;
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nioc.nioc_timeout.tv_usec = (to_ms * 1000) % 1000000;
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}
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if (promisc)
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nioc.nioc_flags |= NF_PROMISC;
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if (ioctl(fd, SIOCSNIT, &nioc) < 0) {
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snprintf(ebuf, PCAP_ERRBUF_SIZE, "SIOCSNIT: %s",
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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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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 sockaddr_nit snit;
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register pcap_t *p;
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p = (pcap_t *)malloc(sizeof(*p));
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if (p == NULL) {
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strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
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return (NULL);
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}
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if (snaplen < 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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snaplen = 96;
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memset(p, 0, sizeof(*p));
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p->fd = fd = socket(AF_NIT, SOCK_RAW, NITPROTO_RAW);
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if (fd < 0) {
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snprintf(ebuf, PCAP_ERRBUF_SIZE,
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"socket: %s", pcap_strerror(errno));
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goto bad;
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}
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snit.snit_family = AF_NIT;
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(void)strncpy(snit.snit_ifname, device, NITIFSIZ);
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if (bind(fd, (struct sockaddr *)&snit, sizeof(snit))) {
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snprintf(ebuf, PCAP_ERRBUF_SIZE,
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"bind: %s: %s", snit.snit_ifname, pcap_strerror(errno));
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goto bad;
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}
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p->snapshot = snaplen;
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nit_setflags(p->fd, promisc, to_ms, ebuf);
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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 = (u_char *)malloc(p->bufsize);
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if (p->buffer == NULL) {
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strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE);
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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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if (fd >= 0)
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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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if (install_bpf_program(p, fp) < 0)
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return (-1);
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return (0);
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}
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