GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/mopd/mopd/../common/pf.c Lines: 0 79 0.0 %
Date: 2017-11-07 Branches: 0 32 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: pf.c,v 1.17 2017/04/19 05:36:13 natano Exp $ */
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/*
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 * Copyright (c) 1993-95 Mats O Jansson.  All rights reserved.
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 * Copyright (c) 1990 The Regents of the University of California.
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 * All rights reserved.
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 *
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 * This code is partly derived from rarpd.
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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 the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <net/if.h>
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#include <net/bpf.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <netdb.h>
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#include <ctype.h>
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#include <string.h>
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#include <err.h>
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#include <errno.h>
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#include <syslog.h>
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#include "common/mopdef.h"
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/*
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 * Variables
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 */
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extern int promisc;
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/*
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 * Return information to device.c how to open device.
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 * In this case the driver can handle both Ethernet type II and
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 * IEEE 802.3 frames (SNAP) in a single pfOpen.
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 */
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/* ARGSUSED */
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int
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pfTrans(char *interface)
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{
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	return (TRANS_ETHER + TRANS_8023 + TRANS_AND);
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}
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/*
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 * Open and initialize packet filter.
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 */
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/* ARGSUSED */
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int
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pfInit(char *interface, int mode, u_short protocol, int typ)
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{
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	int		fd;
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	struct ifreq	ifr;
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	u_int		dlt;
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	int		immediate;
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	static struct bpf_insn insns[] = {
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		BPF_STMT(BPF_LD | BPF_H | BPF_ABS, 12),
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		BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0x4711, 4, 0),
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		BPF_STMT(BPF_LD | BPF_H | BPF_ABS, 20),
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		BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0x4711, 0, 3),
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		BPF_STMT(BPF_LD | BPF_H | BPF_ABS, 14),
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		BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0xaaaa, 0, 1),
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		BPF_STMT(BPF_RET | BPF_K, 1520),
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		BPF_STMT(BPF_RET | BPF_K, 0),
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	};
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	static struct bpf_program filter = {
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		sizeof insns / sizeof(insns[0]),
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		insns
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	};
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	if ((fd = open("/dev/bpf", mode)) == -1) {
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		syslog(LOG_ERR,"pfInit: open bpf %m");
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		return (-1);
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	}
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	/* Set immediate mode so packets are processed as they arrive. */
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	immediate = 1;
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	if (ioctl(fd, BIOCIMMEDIATE, &immediate) < 0) {
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		syslog(LOG_ERR,"pfInit: BIOCIMMEDIATE: %m");
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		return (-1);
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	}
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	strncpy(ifr.ifr_name, interface, sizeof ifr.ifr_name);
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	if (ioctl(fd, BIOCSETIF, &ifr) < 0) {
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		syslog(LOG_ERR,"pfInit: BIOCSETIF: %m");
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		return (-1);
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	}
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	/* Check that the data link layer is an Ethernet; this code won't work
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	 * with anything else. */
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	if (ioctl(fd, BIOCGDLT, &dlt) < 0) {
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		syslog(LOG_ERR,"pfInit: BIOCGDLT: %m");
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		return (-1);
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	}
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	if (dlt != DLT_EN10MB) {
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		syslog(LOG_ERR,"pfInit: %s is not ethernet", interface);
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		return (-1);
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	}
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	if (promisc)
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		/* Set promiscuous mode. */
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		if (ioctl(fd, BIOCPROMISC, 0) < 0) {
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			syslog(LOG_ERR,"pfInit: BIOCPROMISC: %m");
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			return (-1);
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		}
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	/* Set filter program. */
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	insns[1].k = protocol;
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	insns[3].k = protocol;
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	if (ioctl(fd, BIOCSETF, &filter) < 0) {
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		syslog(LOG_ERR,"pfInit: BIOCSETF: %m");
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		return (-1);
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	}
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	/* XXX set the same write filter (for protocol only) */
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	if (ioctl(fd, BIOCSETWF, &filter) < 0) {
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		syslog(LOG_ERR,"pfInit: BIOCSETWF: %m");
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		return (-1);
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	}
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	/* Lock the interface to prevent further changes */
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	if (ioctl(fd, BIOCLOCK) < 0) {
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		syslog(LOG_ERR,"pfInit: BIOCLOCK: %m");
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		return (-1);
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	}
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	return (fd);
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}
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/*
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 * Add a Multicast address to the interface
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 */
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/* ARGSUSED */
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int
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pfAddMulti(int s, char *interface, char *addr)
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{
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	struct ifreq	ifr;
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	int		fd;
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	strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name) - 1);
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	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = 0;
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	ifr.ifr_addr.sa_family = AF_UNSPEC;
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	bcopy(addr, ifr.ifr_addr.sa_data, 6);
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	/*
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	 * open a socket, temporarily, to use for SIOC* ioctls
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	 */
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	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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		syslog(LOG_ERR, "pfAddMulti: socket: %m");
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		return (-1);
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	}
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	if (ioctl(fd, SIOCADDMULTI, &ifr) < 0) {
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		syslog(LOG_ERR, "pfAddMulti: SIOCADDMULTI: %m");
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		close(fd);
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		return (-1);
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	}
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	close(fd);
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	return (0);
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}
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/*
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 * Delete a Multicast address from the interface
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 */
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/* ARGSUSED */
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int
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pfDelMulti(int s, char *interface, char *addr)
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{
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	struct ifreq	ifr;
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	int		fd;
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	strncpy(ifr.ifr_name, interface, sizeof (ifr.ifr_name) - 1);
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	ifr.ifr_name[sizeof(ifr.ifr_name)-1] = 0;
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	ifr.ifr_addr.sa_family = AF_UNSPEC;
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	bcopy(addr, ifr.ifr_addr.sa_data, 6);
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	/*
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	 * open a socket, temporarily, to use for SIOC* ioctls
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	 *
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	 */
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	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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		syslog(LOG_ERR, "pfDelMulti: socket: %m");
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		return (-1);
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	}
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	if (ioctl(fd, SIOCDELMULTI, &ifr) < 0) {
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		syslog(LOG_ERR, "pfAddMulti: SIOCDELMULTI: %m");
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		close(fd);
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		return (-1);
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	}
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	close(fd);
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	return (0);
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}
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/*
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 * read a packet
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 */
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int
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pfRead(int fd, u_char *buf, int len)
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{
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	return (read(fd, buf, len));
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}
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/*
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 * write a packet
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 */
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int
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pfWrite(int fd, u_char *buf, int len, int trans)
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{
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	struct iovec	iov[2];
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	/* XXX */
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	switch (trans) {
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	case TRANS_8023:
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		iov[0].iov_base = buf;
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		iov[0].iov_len = 22;
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		iov[1].iov_base = buf + 22;
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		iov[1].iov_len = len - 22;
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		break;
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	default:
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		iov[0].iov_base = buf;
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		iov[0].iov_len = 14;
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		iov[1].iov_base = buf + 14;
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		iov[1].iov_len = len - 14;
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		break;
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	}
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	if (writev(fd, iov, 2) == len)
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		return (len);
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	return (-1);
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}
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