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- /*
- * Copyright (c) 1989, 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that: (1) source code distributions
- * retain the above copyright notice and this paragraph in its entirety, (2)
- * distributions including binary code include the above copyright notice and
- * this paragraph in its entirety in the documentation or other materials
- * provided with the distribution, and (3) all advertising materials mentioning
- * features or use of this software display the following acknowledgement:
- * ``This product includes software developed by the University of California,
- * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
- * the University nor the names of its contributors may be used to endorse
- * or promote products derived from this software without specific prior
- * written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
- #ifndef lint
- static char rcsid[] =
- "@(#)$Header: pcap-snit.c,v 1.15 92/06/02 17:57:39 mccanne Exp $ (LBL)";
- #endif
-
- /*
- * Modifications made to accomodate the new SunOS4.0 NIT facility by
- * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989.
- * This module now handles the STREAMS based NIT.
- */
-
- #include <stdio.h>
- #include <netdb.h>
- #include <ctype.h>
- #include <signal.h>
- #include <errno.h>
- #include <sys/types.h>
- #include <sys/time.h>
- #include <sys/timeb.h>
- #include <sys/socket.h>
- #include <sys/file.h>
- #include <sys/ioctl.h>
- #include <net/nit.h>
-
- /* Sun OS 4.x includes */
-
- #include <sys/fcntlcom.h>
-
- #include <sys/dir.h>
- #include <net/nit_if.h>
- #include <net/nit_pf.h>
- #include <net/nit_buf.h>
- #include <sys/stropts.h>
-
- #include <net/if.h>
- #include <netinet/in.h>
- #include <netinet/in_systm.h>
- #include <netinet/ip.h>
- #include <netinet/if_ether.h>
- #include <netinet/ip_var.h>
- #include <netinet/udp.h>
- #include <netinet/udp_var.h>
- #include <netinet/tcp.h>
- #include <netinet/tcpip.h>
-
- #include <net/bpf.h>
-
- #include "interface.h"
-
- /*
- * The chunk size for NIT. This is the amount of buffering
- * done for read calls.
- */
- #define CHUNKSIZE (2*1024)
-
- /*
- * The total buffer space used by NIT.
- */
- #define BUFSPACE (4*CHUNKSIZE)
-
- struct nit_stat {
- int dcount;
- int rcount;
- } nstat;
-
- static void
- snit_stats()
- {
- fflush(stdout);
- (void)fprintf(stderr, "%d packets received by filter\n", nstat.rcount);
- (void)fprintf(stderr, "%d packets dropped by kernel\n", nstat.dcount);
- }
-
- void
- readloop(cnt, if_fd, fp, printit)
- int cnt;
- int if_fd;
- struct bpf_program *fp;
- void (*printit)();
- {
- u_char buf[CHUNKSIZE];
- int cc;
- int drops;
- struct nit_stat *nsp = &nstat;
- register struct bpf_insn *fcode = fp->bf_insns;
-
- while ((cc = read(if_fd, (char*)buf, sizeof buf)) >= 0) {
- register u_char *bp, *cp, *bufstop;
- struct nit_bufhdr *hdrp;
- struct nit_iftime *ntp;
- struct nit_iflen *nlp;
- struct nit_ifdrops *ndp;
- int caplen;
-
- bp = buf;
- bufstop = buf + cc;
- /*
- * loop through each snapshot in the chunk
- */
- while (bp < bufstop) {
- ++nsp->rcount;
- cp = bp;
- /* get past NIT buffer */
- hdrp = (struct nit_bufhdr *)cp;
- cp += sizeof(*hdrp);
-
- /* get past NIT timer */
- ntp = (struct nit_iftime *)cp;
- cp += sizeof(*ntp);
-
- ndp = (struct nit_ifdrops *)cp;
- nsp->dcount = ndp->nh_drops;
- cp += sizeof *ndp;
-
- /* get past packet len */
- nlp = (struct nit_iflen *)cp;
- cp += sizeof(*nlp);
-
- /* next snapshot */
- bp += hdrp->nhb_totlen;
-
- caplen = nlp->nh_pktlen;
- if (caplen > snaplen)
- caplen = snaplen;
-
- if (bpf_filter(fcode, cp, nlp->nh_pktlen, caplen)) {
- if (cnt >= 0 && --cnt < 0) {
- wrapup(if_fd);
- return;
- }
- (*printit)(cp, &ntp->nh_timestamp,
- nlp->nh_pktlen, caplen);
- }
- }
- }
- perror("tcpdump: read");
- exit(-1);
- }
-
- wrapup(fd)
- int fd;
- {
- snit_stats();
- close(fd);
- }
-
- int
- initdevice(device, pflag, linktype)
- char *device;
- int pflag;
- int *linktype;
- {
- struct strioctl si; /* struct for ioctl() */
- struct timeval timeout; /* timeout for ioctl() */
- struct ifreq ifr; /* interface request struct */
- u_long if_flags; /* modes for interface */
- int ret;
- int chunksize = CHUNKSIZE;
- int if_fd;
- char *dev = "/dev/nit";
-
- if (snaplen < 96)
- /*
- * NIT requires a snapshot length of at least 96.
- */
- snaplen = 96;
-
- if ((if_fd = open(dev, O_RDONLY)) < 0) {
- (void) fprintf(stderr, "tcpdump: open: ");
- perror(dev);
- exit(-1);
- }
-
- /* arrange to get discrete messages from the STREAM and use NIT_BUF */
- ioctl(if_fd, I_SRDOPT, (char*)RMSGD);
- ioctl(if_fd, I_PUSH, "nbuf");
-
- /* set the timeout */
- si.ic_timout = INFTIM;
- timeout.tv_sec = 1;
- timeout.tv_usec = 0;
- si.ic_cmd = NIOCSTIME;
- si.ic_len = sizeof(timeout);
- si.ic_dp = (char*)&timeout;
- if ((ret = ioctl(if_fd, I_STR, (char*)&si)) < 0) {
- perror("tcpdump: NIOCSTIME");
- exit(-1);
- }
-
- /* set the chunksize */
- si.ic_cmd = NIOCSCHUNK;
- si.ic_len = sizeof(chunksize);
- si.ic_dp = (char*)&chunksize;
- if ((ret = ioctl(if_fd, I_STR, (char*)&si)) < 0) {
- perror("tcpdump: NIOCSCHUNK");
- exit(-1);
- }
-
- /* request the interface */
- strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
- ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' ';
- si.ic_cmd = NIOCBIND;
- si.ic_len = sizeof(ifr);
- si.ic_dp = (char*)𝔦
- if ((ret = ioctl(if_fd, I_STR, (char*)&si)) < 0) {
- (void) fprintf(stderr, "tcpdump: NIOCBIND");
- perror(ifr.ifr_name);
- exit(1);
- }
-
- /* set the snapshot length */
- si.ic_cmd = NIOCSSNAP;
- si.ic_len = sizeof(snaplen);
- si.ic_dp = (char*)&snaplen;
- if ((ret = ioctl(if_fd, I_STR, (char*)&si)) < 0) {
- perror("tcpdump: NIOCSSNAP");
- exit(1);
- }
-
- /* set the interface flags */
- si.ic_cmd = NIOCSFLAGS;
- if_flags = NI_TIMESTAMP | NI_LEN | NI_DROPS;
- if (pflag == 0)
- if_flags |= NI_PROMISC;
- si.ic_len = sizeof(if_flags);
- si.ic_dp = (char*)&if_flags;
- if ((ret = ioctl(if_fd, I_STR, (char*)&si)) < 0) {
- perror("tcpdump: NIOCSFLAGS");
- exit(1);
- }
- ioctl(if_fd, I_FLUSH, (char*)FLUSHR);
- /*
- * NIT supports only ethernets.
- */
- *linktype = DLT_EN10MB;
-
- return if_fd;
- }
-