GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/tftp-proxy/filter.c Lines: 0 98 0.0 %
Date: 2017-11-13 Branches: 0 42 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: filter.c,v 1.2 2015/01/21 21:50:33 deraadt Exp $ */
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/*
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 * Copyright (c) 2004, 2005 Camiel Dobbelaar, <cd@sentia.nl>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <syslog.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <net/pfvar.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.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 "filter.h"
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/* From netinet/in.h, but only _KERNEL_ gets them. */
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#define satosin(sa)	((struct sockaddr_in *)(sa))
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#define satosin6(sa)	((struct sockaddr_in6 *)(sa))
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enum { TRANS_FILTER = 0, TRANS_NAT, TRANS_RDR, TRANS_SIZE };
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int prepare_rule(u_int32_t, struct sockaddr *, struct sockaddr *,
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    u_int16_t, u_int8_t);
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static struct pfioc_rule	pfr;
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static struct pfioc_trans	pft;
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static struct pfioc_trans_e	pfte;
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static int dev, rule_log;
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static char *qname;
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int
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add_filter(u_int32_t id, u_int8_t dir, struct sockaddr *src,
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    struct sockaddr *dst, u_int16_t d_port, u_int8_t proto)
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{
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	if (!src || !dst || !d_port || !proto) {
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		errno = EINVAL;
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		return (-1);
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	}
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	if (prepare_rule(id, src, dst, d_port, proto) == -1)
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		return (-1);
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	pfr.rule.direction = dir;
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	if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
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		return (-1);
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	return (0);
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}
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int
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add_rdr(u_int32_t id, struct sockaddr *src, struct sockaddr *dst,
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    u_int16_t d_port, struct sockaddr *rdr, u_int16_t rdr_port, u_int8_t proto)
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{
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	if (!src || !dst || !d_port || !rdr || !rdr_port || !proto ||
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	    (src->sa_family != rdr->sa_family)) {
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		errno = EINVAL;
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		return (-1);
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	}
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	if (prepare_rule(id, src, dst, d_port, proto) == -1)
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		return (-1);
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	pfr.rule.rdr.addr.type = PF_ADDR_ADDRMASK;
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	if (rdr->sa_family == AF_INET) {
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		memcpy(&pfr.rule.rdr.addr.v.a.addr.v4,
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		    &satosin(rdr)->sin_addr.s_addr, 4);
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		memset(&pfr.rule.rdr.addr.v.a.mask.addr8, 255, 4);
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	} else {
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		memcpy(&pfr.rule.rdr.addr.v.a.addr.v6,
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		    &satosin6(rdr)->sin6_addr.s6_addr, 16);
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		memset(&pfr.rule.rdr.addr.v.a.mask.addr8, 255, 16);
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	}
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	pfr.rule.rdr.proxy_port[0] = rdr_port;
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	if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
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		return (-1);
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	return (0);
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}
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int
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do_commit(void)
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{
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	if (ioctl(dev, DIOCXCOMMIT, &pft) == -1)
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		return (-1);
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	return (0);
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}
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int
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do_rollback(void)
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{
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	if (ioctl(dev, DIOCXROLLBACK, &pft) == -1)
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		return (-1);
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	return (0);
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}
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void
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init_filter(char *opt_qname, int opt_verbose)
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{
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	struct pf_status status;
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	qname = opt_qname;
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	if (opt_verbose == 1)
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		rule_log = PF_LOG;
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	else if (opt_verbose == 2)
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		rule_log = PF_LOG_ALL;
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	dev = open("/dev/pf", O_RDWR);
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	if (dev == -1) {
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		syslog(LOG_ERR, "can't open /dev/pf");
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		exit(1);
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	}
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	if (ioctl(dev, DIOCGETSTATUS, &status) == -1) {
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		syslog(LOG_ERR, "DIOCGETSTATUS");
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		exit(1);
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	}
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	if (!status.running) {
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		syslog(LOG_ERR, "pf is disabled");
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		exit(1);
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	}
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}
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int
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prepare_commit(u_int32_t id)
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{
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	memset(&pft, 0, sizeof pft);
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	memset(&pfte, 0, sizeof pfte);
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	pft.size = 1;
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	pft.esize = sizeof pfte;
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	pft.array = &pfte;
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	snprintf(pfte.anchor, PF_ANCHOR_NAME_SIZE,
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	    "%s/%d.%08x", FTP_PROXY_ANCHOR, getpid(), id);
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	pfte.type = PF_TRANS_RULESET;
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	if (ioctl(dev, DIOCXBEGIN, &pft) == -1)
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		return (-1);
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	return (0);
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}
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int
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prepare_rule(u_int32_t id, struct sockaddr *src,
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    struct sockaddr *dst, u_int16_t d_port, u_int8_t proto)
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{
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	if ((src->sa_family != AF_INET && src->sa_family != AF_INET6) ||
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	    (src->sa_family != dst->sa_family)) {
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		errno = EPROTONOSUPPORT;
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		return (-1);
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	}
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	memset(&pfr, 0, sizeof pfr);
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	snprintf(pfr.anchor, PF_ANCHOR_NAME_SIZE,
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	    "%s/%d.%08x", FTP_PROXY_ANCHOR, getpid(), id);
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	pfr.ticket = pfte.ticket;
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	/* Generic for all rule types. */
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	pfr.rule.af = src->sa_family;
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	pfr.rule.proto = proto;
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	pfr.rule.src.addr.type = PF_ADDR_ADDRMASK;
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	pfr.rule.dst.addr.type = PF_ADDR_ADDRMASK;
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	pfr.rule.rdr.addr.type = PF_ADDR_NONE;
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	pfr.rule.nat.addr.type = PF_ADDR_NONE;
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	if (src->sa_family == AF_INET) {
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		memcpy(&pfr.rule.src.addr.v.a.addr.v4,
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		    &satosin(src)->sin_addr.s_addr, 4);
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		memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 4);
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		memcpy(&pfr.rule.dst.addr.v.a.addr.v4,
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		    &satosin(dst)->sin_addr.s_addr, 4);
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		memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 4);
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	} else {
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		memcpy(&pfr.rule.src.addr.v.a.addr.v6,
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		    &satosin6(src)->sin6_addr.s6_addr, 16);
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		memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 16);
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		memcpy(&pfr.rule.dst.addr.v.a.addr.v6,
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		    &satosin6(dst)->sin6_addr.s6_addr, 16);
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		memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 16);
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	}
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	pfr.rule.dst.port_op = PF_OP_EQ;
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	pfr.rule.dst.port[0] = htons(d_port);
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#ifdef notyet
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	pfr.rule.rule_flag = PFRULE_ONCE;
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#endif
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	pfr.rule.action = PF_PASS;
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	pfr.rule.quick = 1;
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	pfr.rule.log = rule_log;
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	pfr.rule.keep_state = 1;
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	pfr.rule.flags = (proto == IPPROTO_TCP ? TH_SYN : 0);
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	pfr.rule.flagset = (proto == IPPROTO_TCP ?
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	    (TH_SYN|TH_ACK|TH_FIN|TH_RST) : 0);
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#ifdef notyet
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	pfr.rule.max_states = 1;
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#endif
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	if (qname != NULL)
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		strlcpy(pfr.rule.qname, qname, sizeof pfr.rule.qname);
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	return (0);
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}