/*

 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996

 *	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.

 *

 * Modifications made to accommodate 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.

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <sys/types.h>

#include <sys/time.h>

#include <sys/timeb.h>

#include <sys/dir.h>

#include <sys/fcntlcom.h>

#include <sys/file.h>

#include <sys/ioctl.h>

#include <sys/socket.h>

#include <sys/stropts.h>

#include <net/if.h>

#include <net/nit.h>

#include <net/nit_if.h>

#include <net/nit_pf.h>

#include <net/nit_buf.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 <ctype.h>

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include "pcap-int.h"

#ifdef HAVE_OS_PROTO_H

#include "os-proto.h"

#endif

/*

 * 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)

/* Forwards */

static int nit_setflags(int, int, int, char *);

/*

 * Private data for capturing on STREAMS NIT devices.

 */

struct pcap_snit {

	struct pcap_stat stat;

};

static int

pcap_stats_snit(pcap_t *p, struct pcap_stat *ps)

{

	struct pcap_snit *psn = p->priv;

	/*

	 * "ps_recv" counts packets handed to the filter, not packets

	 * that passed the filter.  As filtering is done in userland,

	 * this does not include packets dropped because we ran out

	 * of buffer space.

	 *

	 * "ps_drop" counts packets dropped inside the "/dev/nit"

	 * device because of flow control requirements or resource

	 * exhaustion; it doesn't count packets dropped by the

	 * interface driver, or packets dropped upstream.  As filtering

	 * is done in userland, it counts packets regardless of whether

	 * they would've passed the filter.

	 *

	 * These statistics don't include packets not yet read from the

	 * kernel by libpcap or packets not yet read from libpcap by the

	 * application.

	 */

	*ps = psn->stat;

	return (0);

}

static int

pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)

{

	struct pcap_snit *psn = p->priv;

	register int cc, n;

	register u_char *bp, *cp, *ep;

	register struct nit_bufhdr *hdrp;

	register struct nit_iftime *ntp;

	register struct nit_iflen *nlp;

	register struct nit_ifdrops *ndp;

	register int caplen;

	cc = p->cc;

	if (cc == 0) {

		cc = read(p->fd, (char *)p->buffer, p->bufsize);

		if (cc < 0) {

			if (errno == EWOULDBLOCK)

				return (0);

			pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),

			    errno, "pcap_read");

			return (-1);

		}

		bp = (u_char *)p->buffer;

	} else

		bp = p->bp;

	/*

	 * loop through each snapshot in the chunk

	 */

	n = 0;

	ep = bp + cc;

	while (bp < ep) {

		/*

		 * Has "pcap_breakloop()" been called?

		 * If so, return immediately - if we haven't read any

		 * packets, clear the flag and return -2 to indicate

		 * that we were told to break out of the loop, otherwise

		 * leave the flag set, so that the *next* call will break

		 * out of the loop without having read any packets, and

		 * return the number of packets we've processed so far.

		 */

		if (p->break_loop) {

			if (n == 0) {

				p->break_loop = 0;

				return (-2);

			} else {

				p->bp = bp;

				p->cc = ep - bp;

				return (n);

			}

		}

		++psn->stat.ps_recv;

		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;

		psn->stat.ps_drop = 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 > p->snapshot)

			caplen = p->snapshot;

		if (bpf_filter(p->fcode.bf_insns, cp, nlp->nh_pktlen, caplen)) {

			struct pcap_pkthdr h;

			h.ts = ntp->nh_timestamp;

			h.len = nlp->nh_pktlen;

			h.caplen = caplen;

			(*callback)(user, &h, cp);

			if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {

				p->cc = ep - bp;

				p->bp = bp;

				return (n);

			}

		}

	}

	p->cc = 0;

	return (n);

}

static int

pcap_inject_snit(pcap_t *p, const void *buf, size_t size)

{

	struct strbuf ctl, data;

	/*

	 * XXX - can we just do

	 *

	ret = write(pd->f, buf, size);

	 */

	ctl.len = sizeof(*sa);	/* XXX - what was this? */

	ctl.buf = (char *)sa;

	data.buf = buf;

	data.len = size;

	ret = putmsg(p->fd, &ctl, &data);

	if (ret == -1) {

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "send");

		return (-1);

	}

	return (ret);

}

static int

nit_setflags(pcap_t *p)

{

	bpf_u_int32 flags;

	struct strioctl si;

	u_int zero = 0;

	struct timeval timeout;

	if (p->opt.immediate) {

		/*

		 * Set the chunk size to zero, so that chunks get sent

		 * up immediately.

		 */

		si.ic_cmd = NIOCSCHUNK;

		si.ic_len = sizeof(zero);

		si.ic_dp = (char *)&zer;;

		if (ioctl(p->fd, I_STR, (char *)&si) < 0) {

			pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

			    errno, "NIOCSCHUNK");

			return (-1);

		}

	}

	si.ic_timout = INFTIM;

	if (p->opt.timeout != 0) {

		timeout.tv_sec = p->opt.timeout / 1000;

		timeout.tv_usec = (p->opt.timeout * 1000) % 1000000;

		si.ic_cmd = NIOCSTIME;

		si.ic_len = sizeof(timeout);

		si.ic_dp = (char *)&timeout;

		if (ioctl(p->fd, I_STR, (char *)&si) < 0) {

			pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

			    errno, "NIOCSTIME");

			return (-1);

		}

	}

	flags = NI_TIMESTAMP | NI_LEN | NI_DROPS;

	if (p->opt.promisc)

		flags |= NI_PROMISC;

	si.ic_cmd = NIOCSFLAGS;

	si.ic_len = sizeof(flags);

	si.ic_dp = (char *)&flag;;

	if (ioctl(p->fd, I_STR, (char *)&si) < 0) {

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "NIOCSFLAGS");

		return (-1);

	}

	return (0);

}

static int

pcap_activate_snit(pcap_t *p)

{

	struct strioctl si;		/* struct for ioctl() */

	struct ifreq ifr;		/* interface request struct */

	int chunksize = CHUNKSIZE;

	int fd;

	static const char dev[] = "/dev/nit";

	int err;

	if (p->opt.rfmon) {

		/*

		 * No monitor mode on SunOS 4.x (no Wi-Fi devices on

		 * hardware supported by SunOS 4.x).

		 */

		return (PCAP_ERROR_RFMON_NOTSUP);

	}

	/*

	 * Turn a negative snapshot value (invalid), a snapshot value of

	 * 0 (unspecified), or a value bigger than the normal maximum

	 * value, into the maximum allowed value.

	 *

	 * If some application really *needs* a bigger snapshot

	 * length, we should just increase MAXIMUM_SNAPLEN.

	 */

	if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)

		p->snapshot = MAXIMUM_SNAPLEN;

	if (p->snapshot < 96)

		/*

		 * NIT requires a snapshot length of at least 96.

		 */

		p->snapshot = 96;

	/*

	 * Initially try a read/write open (to allow the inject

	 * method to work).  If that fails due to permission

	 * issues, fall back to read-only.  This allows a

	 * non-root user to be granted specific access to pcap

	 * capabilities via file permissions.

	 *

	 * XXX - we should have an API that has a flag that

	 * controls whether to open read-only or read-write,

	 * so that denial of permission to send (or inability

	 * to send, if sending packets isn't supported on

	 * the device in question) can be indicated at open

	 * time.

	 */

	p->fd = fd = open(dev, O_RDWR);

	if (fd < 0 && errno == EACCES)

		p->fd = fd = open(dev, O_RDONLY);

	if (fd < 0) {

		if (errno == EACCES)

			err = PCAP_ERROR_PERM_DENIED;

		else

			err = PCAP_ERROR;

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "%s", dev);

		goto bad;

	}

	/* arrange to get discrete messages from the STREAM and use NIT_BUF */

	if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) {

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "I_SRDOPT");

		err = PCAP_ERROR;

		goto bad;

	}

	if (ioctl(fd, I_PUSH, "nbuf") < 0) {

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "push nbuf");

		err = PCAP_ERROR;

		goto bad;

	}

	/* set the chunksize */

	si.ic_cmd = NIOCSCHUNK;

	si.ic_timout = INFTIM;

	si.ic_len = sizeof(chunksize);

	si.ic_dp = (char *)&chunksize;

	if (ioctl(fd, I_STR, (char *)&si) < 0) {

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "NIOCSCHUNK");

		err = PCAP_ERROR;

		goto bad;

	}

	/* request the interface */

	strncpy(ifr.ifr_name, p->opt.device, sizeof(ifr.ifr_name));

	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';

	si.ic_cmd = NIOCBIND;

	si.ic_len = sizeof(ifr);

	si.ic_dp = (char *)𝔦

	if (ioctl(fd, I_STR, (char *)&si) < 0) {

		/*

		 * XXX - is there an error that means "no such device"?

		 * Is there one that means "that device doesn't support

		 * STREAMS NIT"?

		 */

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "NIOCBIND: %s", ifr.ifr_name);

		err = PCAP_ERROR;

		goto bad;

	}

	/* set the snapshot length */

	si.ic_cmd = NIOCSSNAP;

	si.ic_len = sizeof(p->snapshot);

	si.ic_dp = (char *)&p->snapshot;

	if (ioctl(fd, I_STR, (char *)&si) < 0) {

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "NIOCSSNAP");

		err = PCAP_ERROR;

		goto bad;

	}

	if (nit_setflags(p) < 0) {

		err = PCAP_ERROR;

		goto bad;

	}

	(void)ioctl(fd, I_FLUSH, (char *)FLUSHR);

	/*

	 * NIT supports only ethernets.

	 */

	p->linktype = DLT_EN10MB;

	p->bufsize = BUFSPACE;

	p->buffer = malloc(p->bufsize);

	if (p->buffer == NULL) {

		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,

		    errno, "malloc");

		err = PCAP_ERROR;

		goto bad;

	}

	/*

	 * "p->fd" is an FD for a STREAMS device, so "select()" and

	 * "poll()" should work on it.

	 */

	p->selectable_fd = p->fd;

	/*

	 * 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;

	}

	p->read_op = pcap_read_snit;

	p->inject_op = pcap_inject_snit;

	p->setfilter_op = install_bpf_program;	/* no kernel filtering */

	p->setdirection_op = NULL;	/* Not implemented. */

	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_snit;

	return (0);

 bad:

	pcap_cleanup_live_common(p);

	return (err);

}

pcap_t *

pcap_create_interface(const char *device _U_, char *ebuf)

{

	pcap_t *p;

	p = pcap_create_common(ebuf, sizeof (struct pcap_snit));

	if (p == NULL)

		return (NULL);

	p->activate_op = pcap_activate_snit;

	return (p);

}

/*

 * XXX - there's probably a NIOCBIND error that means "that device

 * doesn't support NIT"; if so, we should try an NIOCBIND and use that.

 */

static int

can_be_bound(const char *name _U_)

{

	return (1);

}

static int

get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_)

{

	/*

	 * Nothing we can do.

	 * XXX - is there a way to find out whether an adapter has

	 * something plugged into it?

	 */

	return (0);

}

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);

}