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miniupnp/miniupnpd/pf/obsdrdr.c

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/* $Id: obsdrdr.c,v 1.88 2018/04/12 09:27:53 nanard Exp $ */
/* vim: tabstop=4 shiftwidth=4 noexpandtab
* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
* (c) 2006-2018 Thomas Bernard
* This software is subject to the conditions detailed
* in the LICENCE file provided within the distribution */
/*
* pf rules created (with ext_if = xl1)
* - OpenBSD up to version 4.6 :
* rdr pass on xl1 inet proto udp from any to any port = 54321 \
* keep state label "test label" -> 192.168.0.42 port 12345
* or a rdr rule + a pass rule :
* rdr quick on xl1 inet proto udp from any to any port = 54321 \
* keep state label "test label" -> 192.168.0.42 port 12345
* pass in quick on xl1 inet proto udp from any to 192.168.0.42 port = 12345 \
* flags S/SA keep state label "test label"
*
* - OpenBSD starting from version 4.7
* match in on xl1 inet proto udp from any to any port 54321 \
* label "test label" rdr-to 192.168.0.42 port 12345
* or
* pass in quick on xl1 inet proto udp from any to any port 54321 \
* label "test label" rdr-to 192.168.0.42 port 12345
*
*
*
* Macros/#defines :
* - PF_ENABLE_FILTER_RULES
* If set, two rules are created : rdr + pass. Else a rdr/pass rule
* is created.
* - USE_IFNAME_IN_RULES
* If set the interface name is set in the rule.
* - PFRULE_INOUT_COUNTS
* Must be set with OpenBSD version 3.8 and up.
* - PFRULE_HAS_RTABLEID
* Must be set with OpenBSD version 4.0 and up.
* - PF_NEWSSTYLE
* Must be set with OpenBSD version 4.7 and up.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#ifdef __DragonFly__
#include <net/pf/pfvar.h>
#else
#ifdef __APPLE__
#define PRIVATE 1
#endif
#include <net/pfvar.h>
#endif
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <string.h>
#include <syslog.h>
#include <stdio.h>
#include <stdlib.h>
#include "../macros.h"
#include "../config.h"
#include "obsdrdr.h"
#include "../upnpglobalvars.h"
#ifndef USE_PF
#error "USE_PF macro is undefined, check consistency between config.h and Makefile"
#else
/* list to keep timestamps for port mappings having a lease duration */
struct timestamp_entry {
struct timestamp_entry * next;
unsigned int timestamp;
unsigned short eport;
short protocol;
};
static struct timestamp_entry * timestamp_list = NULL;
static unsigned int
get_timestamp(unsigned short eport, int proto)
{
struct timestamp_entry * e;
e = timestamp_list;
while(e) {
if(e->eport == eport && e->protocol == (short)proto)
return e->timestamp;
e = e->next;
}
return 0;
}
static void
remove_timestamp_entry(unsigned short eport, int proto)
{
struct timestamp_entry * e;
struct timestamp_entry * * p;
p = &timestamp_list;
e = *p;
while(e) {
if(e->eport == eport && e->protocol == (short)proto) {
/* remove the entry */
*p = e->next;
free(e);
return;
}
p = &(e->next);
e = *p;
}
}
static void
add_timestamp_entry(unsigned short eport, int proto, unsigned timestamp)
{
struct timestamp_entry * tmp;
tmp = malloc(sizeof(struct timestamp_entry));
if(tmp)
{
tmp->next = timestamp_list;
tmp->timestamp = timestamp;
tmp->eport = eport;
tmp->protocol = (short)proto;
timestamp_list = tmp;
}
else
{
syslog(LOG_ERR, "add_timestamp_entry() malloc(%lu) error",
sizeof(struct timestamp_entry));
}
}
/* /dev/pf when opened */
int dev = -1;
/* shutdown_redirect() :
* close the /dev/pf device */
void
shutdown_redirect(void)
{
if(close(dev)<0)
syslog(LOG_ERR, "close(\"/dev/pf\"): %m");
dev = -1;
}
/* open the device */
int
init_redirect(void)
{
struct pf_status status;
if(dev>=0)
shutdown_redirect();
dev = open("/dev/pf", O_RDWR);
if(dev<0) {
syslog(LOG_ERR, "open(\"/dev/pf\"): %m");
return -1;
}
if(ioctl(dev, DIOCGETSTATUS, &status)<0) {
syslog(LOG_ERR, "DIOCGETSTATUS: %m");
return -1;
}
if(!status.running) {
syslog(LOG_ERR, "pf is disabled");
return -1;
}
return 0;
}
#if TEST
/* for debug */
int
clear_redirect_rules(void)
{
struct pfioc_trans io;
struct pfioc_trans_e ioe;
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
memset(&ioe, 0, sizeof(ioe));
io.size = 1;
io.esize = sizeof(ioe);
io.array = &ioe;
#ifndef PF_NEWSTYLE
ioe.rs_num = PF_RULESET_RDR;
#else
ioe.type = PF_TRANS_RULESET;
#endif
strlcpy(ioe.anchor, anchor_name, MAXPATHLEN);
if(ioctl(dev, DIOCXBEGIN, &io) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCXBEGIN, ...): %m");
goto error;
}
if(ioctl(dev, DIOCXCOMMIT, &io) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCXCOMMIT, ...): %m");
goto error;
}
return 0;
error:
return -1;
}
int
clear_filter_rules(void)
{
#ifndef PF_ENABLE_FILTER_RULES
return 0;
#else
struct pfioc_trans io;
struct pfioc_trans_e ioe;
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
memset(&ioe, 0, sizeof(ioe));
io.size = 1;
io.esize = sizeof(ioe);
io.array = &ioe;
#ifndef PF_NEWSTYLE
ioe.rs_num = PF_RULESET_FILTER;
#else
/* ? */
ioe.type = PF_TRANS_RULESET;
#endif
strlcpy(ioe.anchor, anchor_name, MAXPATHLEN);
if(ioctl(dev, DIOCXBEGIN, &io) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCXBEGIN, ...): %m");
goto error;
}
if(ioctl(dev, DIOCXCOMMIT, &io) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCXCOMMIT, ...): %m");
goto error;
}
return 0;
error:
return -1;
#endif
}
#endif
/* add_redirect_rule2() :
* create a rdr rule */
int
add_redirect_rule2(const char * ifname,
const char * rhost, unsigned short eport,
const char * iaddr, unsigned short iport, int proto,
const char * desc, unsigned int timestamp)
{
int r;
struct pfioc_rule pcr;
#ifndef PF_NEWSTYLE
struct pfioc_pooladdr pp;
struct pf_pooladdr *a;
#endif
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
r = 0;
memset(&pcr, 0, sizeof(pcr));
strlcpy(pcr.anchor, anchor_name, MAXPATHLEN);
#ifndef PF_NEWSTYLE
memset(&pp, 0, sizeof(pp));
strlcpy(pp.anchor, anchor_name, MAXPATHLEN);
if(ioctl(dev, DIOCBEGINADDRS, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCBEGINADDRS, ...): %m");
r = -1;
}
else
{
pcr.pool_ticket = pp.ticket;
#else
if(1)
{
pcr.rule.direction = PF_IN;
/*pcr.rule.src.addr.type = PF_ADDR_NONE;*/
pcr.rule.src.addr.type = PF_ADDR_ADDRMASK;
pcr.rule.dst.addr.type = PF_ADDR_ADDRMASK;
pcr.rule.nat.addr.type = PF_ADDR_NONE;
pcr.rule.rdr.addr.type = PF_ADDR_ADDRMASK;
#endif
#ifdef __APPLE__
pcr.rule.dst.xport.range.op = PF_OP_EQ;
pcr.rule.dst.xport.range.port[0] = htons(eport);
pcr.rule.dst.xport.range.port[1] = htons(eport);
#else
pcr.rule.dst.port_op = PF_OP_EQ;
pcr.rule.dst.port[0] = htons(eport);
pcr.rule.dst.port[1] = htons(eport);
#endif
#ifndef PF_NEWSTYLE
pcr.rule.action = PF_RDR;
#ifndef PF_ENABLE_FILTER_RULES
pcr.rule.natpass = 1;
#else
pcr.rule.natpass = 0;
#endif
#else
#ifndef PF_ENABLE_FILTER_RULES
pcr.rule.action = PF_PASS;
#else
pcr.rule.action = PF_MATCH;
#endif
#endif
pcr.rule.af = AF_INET;
#ifdef USE_IFNAME_IN_RULES
if(ifname)
strlcpy(pcr.rule.ifname, ifname, IFNAMSIZ);
#endif
pcr.rule.proto = proto;
pcr.rule.log = (GETFLAG(LOGPACKETSMASK))?1:0; /*logpackets;*/
#ifdef PFRULE_HAS_RTABLEID
pcr.rule.rtableid = -1; /* first appeared in OpenBSD 4.0 */
#endif
#ifdef PFRULE_HAS_ONRDOMAIN
pcr.rule.onrdomain = -1; /* first appeared in OpenBSD 5.0 */
#endif
pcr.rule.quick = 1;
pcr.rule.keep_state = PF_STATE_NORMAL;
if(tag)
strlcpy(pcr.rule.tagname, tag, PF_TAG_NAME_SIZE);
strlcpy(pcr.rule.label, desc, PF_RULE_LABEL_SIZE);
if(rhost && rhost[0] != '\0' && rhost[0] != '*')
{
inet_pton(AF_INET, rhost, &pcr.rule.src.addr.v.a.addr.v4.s_addr);
pcr.rule.src.addr.v.a.mask.v4.s_addr = htonl(INADDR_NONE);
}
if(use_ext_ip_addr && use_ext_ip_addr[0] != '\0')
{
inet_pton(AF_INET, use_ext_ip_addr, &pcr.rule.dst.addr.v.a.addr.v4.s_addr);
pcr.rule.dst.addr.v.a.mask.v4.s_addr = htonl(INADDR_NONE);
}
#ifndef PF_NEWSTYLE
pcr.rule.rpool.proxy_port[0] = iport;
pcr.rule.rpool.proxy_port[1] = iport;
TAILQ_INIT(&pcr.rule.rpool.list);
a = calloc(1, sizeof(struct pf_pooladdr));
inet_pton(AF_INET, iaddr, &a->addr.v.a.addr.v4.s_addr);
a->addr.v.a.mask.v4.s_addr = htonl(INADDR_NONE);
TAILQ_INSERT_TAIL(&pcr.rule.rpool.list, a, entries);
memcpy(&pp.addr, a, sizeof(struct pf_pooladdr));
if(ioctl(dev, DIOCADDADDR, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCADDADDR, ...): %m");
r = -1;
}
else
{
#else
pcr.rule.rdr.proxy_port[0] = iport;
pcr.rule.rdr.proxy_port[1] = iport;
inet_pton(AF_INET, iaddr, &pcr.rule.rdr.addr.v.a.addr.v4.s_addr);
pcr.rule.rdr.addr.v.a.mask.v4.s_addr = htonl(INADDR_NONE);
if(1)
{
#endif
pcr.action = PF_CHANGE_GET_TICKET;
if(ioctl(dev, DIOCCHANGERULE, &pcr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_GET_TICKET: %m");
r = -1;
}
else
{
pcr.action = PF_CHANGE_ADD_TAIL;
if(ioctl(dev, DIOCCHANGERULE, &pcr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_ADD_TAIL: %m");
r = -1;
}
}
}
#ifndef PF_NEWSTYLE
free(a);
#endif
}
if(r == 0 && timestamp > 0)
add_timestamp_entry(eport, proto, timestamp);
return r;
}
/* thanks to Seth Mos for this function */
int
add_filter_rule2(const char * ifname,
const char * rhost, const char * iaddr,
unsigned short eport, unsigned short iport,
int proto, const char * desc)
{
#ifndef PF_ENABLE_FILTER_RULES
UNUSED(ifname);
UNUSED(rhost); UNUSED(iaddr);
UNUSED(eport); UNUSED(iport);
UNUSED(proto); UNUSED(desc);
return 0;
#else
int r;
struct pfioc_rule pcr;
#ifndef PF_NEWSTYLE
struct pfioc_pooladdr pp;
#endif
#ifndef USE_IFNAME_IN_RULES
UNUSED(ifname);
#endif
UNUSED(eport);
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
r = 0;
memset(&pcr, 0, sizeof(pcr));
strlcpy(pcr.anchor, anchor_name, MAXPATHLEN);
#ifndef PF_NEWSTYLE
memset(&pp, 0, sizeof(pp));
strlcpy(pp.anchor, anchor_name, MAXPATHLEN);
if(ioctl(dev, DIOCBEGINADDRS, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCBEGINADDRS, ...): %m");
r = -1;
}
else
{
pcr.pool_ticket = pp.ticket;
#else
if(1)
{
#endif
pcr.rule.dst.port_op = PF_OP_EQ;
pcr.rule.dst.port[0] = htons(iport);
pcr.rule.direction = PF_IN;
pcr.rule.action = PF_PASS;
pcr.rule.af = AF_INET;
#ifdef USE_IFNAME_IN_RULES
if(ifname)
strlcpy(pcr.rule.ifname, ifname, IFNAMSIZ);
#endif
pcr.rule.proto = proto;
pcr.rule.quick = (GETFLAG(PFNOQUICKRULESMASK))?0:1;
pcr.rule.log = (GETFLAG(LOGPACKETSMASK))?1:0; /*logpackets;*/
/* see the discussion on the forum :
* http://miniupnp.tuxfamily.org/forum/viewtopic.php?p=638 */
pcr.rule.flags = TH_SYN;
pcr.rule.flagset = (TH_SYN|TH_ACK);
#ifdef PFRULE_HAS_RTABLEID
pcr.rule.rtableid = -1; /* first appeared in OpenBSD 4.0 */
#endif
#ifdef PFRULE_HAS_ONRDOMAIN
pcr.rule.onrdomain = -1; /* first appeared in OpenBSD 5.0 */
#endif
pcr.rule.keep_state = 1;
strlcpy(pcr.rule.label, desc, PF_RULE_LABEL_SIZE);
if(queue)
strlcpy(pcr.rule.qname, queue, PF_QNAME_SIZE);
if(tag)
strlcpy(pcr.rule.tagname, tag, PF_TAG_NAME_SIZE);
if(rhost && rhost[0] != '\0' && rhost[0] != '*')
{
inet_pton(AF_INET, rhost, &pcr.rule.src.addr.v.a.addr.v4.s_addr);
pcr.rule.src.addr.v.a.mask.v4.s_addr = htonl(INADDR_NONE);
}
/* we want any - iaddr port = # keep state label */
inet_pton(AF_INET, iaddr, &pcr.rule.dst.addr.v.a.addr.v4.s_addr);
pcr.rule.dst.addr.v.a.mask.v4.s_addr = htonl(INADDR_NONE);
#ifndef PF_NEWSTYLE
pcr.rule.rpool.proxy_port[0] = iport;
pcr.rule.rpool.proxy_port[1] = iport;
TAILQ_INIT(&pcr.rule.rpool.list);
#endif
if(1)
{
pcr.action = PF_CHANGE_GET_TICKET;
if(ioctl(dev, DIOCCHANGERULE, &pcr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_GET_TICKET: %m");
r = -1;
}
else
{
pcr.action = PF_CHANGE_ADD_TAIL;
if(ioctl(dev, DIOCCHANGERULE, &pcr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_ADD_TAIL: %m");
r = -1;
}
}
}
}
return r;
#endif
}
/* get_redirect_rule()
* return value : 0 success (found)
* -1 = error or rule not found */
int
get_redirect_rule(const char * ifname, unsigned short eport, int proto,
char * iaddr, int iaddrlen, unsigned short * iport,
char * desc, int desclen,
char * rhost, int rhostlen,
unsigned int * timestamp,
u_int64_t * packets, u_int64_t * bytes)
{
int i, n;
struct pfioc_rule pr;
#ifndef PF_NEWSTYLE
struct pfioc_pooladdr pp;
#endif
UNUSED(ifname);
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
memset(&pr, 0, sizeof(pr));
strlcpy(pr.anchor, anchor_name, MAXPATHLEN);
#ifndef PF_NEWSTYLE
pr.rule.action = PF_RDR;
#endif
if(ioctl(dev, DIOCGETRULES, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULES, ...): %m");
goto error;
}
n = pr.nr;
for(i=0; i<n; i++)
{
pr.nr = i;
if(ioctl(dev, DIOCGETRULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULE): %m");
goto error;
}
#ifdef __APPLE__
if( (eport == ntohs(pr.rule.dst.xport.range.port[0]))
&& (eport == ntohs(pr.rule.dst.xport.range.port[1]))
#else
if( (eport == ntohs(pr.rule.dst.port[0]))
&& (eport == ntohs(pr.rule.dst.port[1]))
#endif
&& (pr.rule.proto == proto) )
{
#ifndef PF_NEWSTYLE
*iport = pr.rule.rpool.proxy_port[0];
#else
*iport = pr.rule.rdr.proxy_port[0];
#endif
if(desc)
strlcpy(desc, pr.rule.label, desclen);
#ifdef PFRULE_INOUT_COUNTS
if(packets)
*packets = pr.rule.packets[0] + pr.rule.packets[1];
if(bytes)
*bytes = pr.rule.bytes[0] + pr.rule.bytes[1];
#else
if(packets)
*packets = pr.rule.packets;
if(bytes)
*bytes = pr.rule.bytes;
#endif
#ifndef PF_NEWSTYLE
memset(&pp, 0, sizeof(pp));
strlcpy(pp.anchor, anchor_name, MAXPATHLEN);
pp.r_action = PF_RDR;
pp.r_num = i;
pp.ticket = pr.ticket;
if(ioctl(dev, DIOCGETADDRS, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETADDRS, ...): %m");
goto error;
}
if(pp.nr != 1)
{
syslog(LOG_NOTICE, "No address associated with pf rule");
goto error;
}
pp.nr = 0; /* first */
if(ioctl(dev, DIOCGETADDR, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETADDR, ...): %m");
goto error;
}
inet_ntop(AF_INET, &pp.addr.addr.v.a.addr.v4.s_addr,
iaddr, iaddrlen);
#else
inet_ntop(AF_INET, &pr.rule.rdr.addr.v.a.addr.v4.s_addr,
iaddr, iaddrlen);
#endif
if(rhost && rhostlen > 0)
{
if (pr.rule.src.addr.v.a.addr.v4.s_addr == 0)
{
rhost[0] = '\0'; /* empty string */
}
else
{
inet_ntop(AF_INET, &pr.rule.src.addr.v.a.addr.v4.s_addr,
rhost, rhostlen);
}
}
if(timestamp)
*timestamp = get_timestamp(eport, proto);
return 0;
}
}
error:
return -1;
}
#define priv_delete_redirect_rule(ifname, eport, proto, iport, \
iaddr, rhost, rhostlen) \
priv_delete_redirect_rule_check_desc(ifname, eport, proto, iport, \
iaddr, rhost, rhostlen, 0, NULL)
/* if check_desc is true, only delete the rule if the description differs.
* returns : -1 : error / rule not found
* 0 : rule deleted
* 1 : rule untouched
*/
static int
priv_delete_redirect_rule_check_desc(const char * ifname, unsigned short eport,
int proto, unsigned short * iport,
in_addr_t * iaddr, char * rhost, int rhostlen,
int check_desc, const char * desc)
{
int i, n;
struct pfioc_rule pr;
UNUSED(ifname);
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
memset(&pr, 0, sizeof(pr));
strlcpy(pr.anchor, anchor_name, MAXPATHLEN);
#ifndef PF_NEWSTYLE
pr.rule.action = PF_RDR;
#endif
if(ioctl(dev, DIOCGETRULES, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULES, ...): %m");
goto error;
}
n = pr.nr;
for(i=0; i<n; i++)
{
pr.nr = i;
if(ioctl(dev, DIOCGETRULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULE): %m");
goto error;
}
#ifdef __APPLE__
if( (eport == ntohs(pr.rule.dst.xport.range.port[0]))
&& (eport == ntohs(pr.rule.dst.xport.range.port[1]))
#else
if( (eport == ntohs(pr.rule.dst.port[0]))
&& (eport == ntohs(pr.rule.dst.port[1]))
#endif
&& (pr.rule.proto == proto) )
{
/* retrieve iport in order to remove filter rule */
#ifndef PF_NEWSTYLE
if(iport) *iport = pr.rule.rpool.proxy_port[0];
if(iaddr)
{
/* retrieve internal address */
struct pfioc_pooladdr pp;
memset(&pp, 0, sizeof(pp));
strlcpy(pp.anchor, anchor_name, MAXPATHLEN);
pp.r_action = PF_RDR;
pp.r_num = i;
pp.ticket = pr.ticket;
if(ioctl(dev, DIOCGETADDRS, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETADDRS, ...): %m");
goto error;
}
if(pp.nr != 1)
{
syslog(LOG_NOTICE, "No address associated with pf rule");
goto error;
}
pp.nr = 0; /* first */
if(ioctl(dev, DIOCGETADDR, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETADDR, ...): %m");
goto error;
}
*iaddr = pp.addr.addr.v.a.addr.v4.s_addr;
}
#else
if(iport) *iport = pr.rule.rdr.proxy_port[0];
if(iaddr)
{
/* retrieve internal address */
*iaddr = pr.rule.rdr.addr.v.a.addr.v4.s_addr;
}
#endif
if(rhost && rhostlen > 0)
{
if (pr.rule.src.addr.v.a.addr.v4.s_addr == 0)
rhost[0] = '\0'; /* empty string */
else
inet_ntop(AF_INET, &pr.rule.src.addr.v.a.addr.v4.s_addr,
rhost, rhostlen);
}
if(check_desc) {
if((desc == NULL && pr.rule.label[0] == '\0') ||
(desc && 0 == strcmp(desc, pr.rule.label))) {
return 1;
}
}
pr.action = PF_CHANGE_GET_TICKET;
if(ioctl(dev, DIOCCHANGERULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_GET_TICKET: %m");
goto error;
}
pr.action = PF_CHANGE_REMOVE;
pr.nr = i;
if(ioctl(dev, DIOCCHANGERULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_REMOVE: %m");
goto error;
}
remove_timestamp_entry(eport, proto);
return 0;
}
}
error:
return -1;
}
int
delete_redirect_rule(const char * ifname, unsigned short eport,
int proto)
{
return priv_delete_redirect_rule(ifname, eport, proto, NULL, NULL, NULL, 0);
}
static int
priv_delete_filter_rule(const char * ifname, unsigned short iport,
int proto, in_addr_t iaddr)
{
#ifndef PF_ENABLE_FILTER_RULES
UNUSED(ifname); UNUSED(iport); UNUSED(proto); UNUSED(iaddr);
return 0;
#else
int i, n;
struct pfioc_rule pr;
UNUSED(ifname);
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
memset(&pr, 0, sizeof(pr));
strlcpy(pr.anchor, anchor_name, MAXPATHLEN);
pr.rule.action = PF_PASS;
if(ioctl(dev, DIOCGETRULES, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULES, ...): %m");
goto error;
}
n = pr.nr;
for(i=0; i<n; i++)
{
pr.nr = i;
if(ioctl(dev, DIOCGETRULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULE): %m");
goto error;
}
#ifdef TEST
syslog(LOG_DEBUG, "%2d port=%hu proto=%d addr=%8x",
i, ntohs(pr.rule.dst.port[0]), pr.rule.proto,
pr.rule.dst.addr.v.a.addr.v4.s_addr);
/*pr.rule.dst.addr.v.a.mask.v4.s_addr*/
#endif
if( (iport == ntohs(pr.rule.dst.port[0]))
&& (pr.rule.proto == proto) &&
(iaddr == pr.rule.dst.addr.v.a.addr.v4.s_addr)
)
{
pr.action = PF_CHANGE_GET_TICKET;
if(ioctl(dev, DIOCCHANGERULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_GET_TICKET: %m");
goto error;
}
pr.action = PF_CHANGE_REMOVE;
pr.nr = i;
if(ioctl(dev, DIOCCHANGERULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCCHANGERULE, ...) PF_CHANGE_REMOVE: %m");
goto error;
}
return 0;
}
}
error:
return -1;
#endif
}
int
delete_redirect_and_filter_rules(const char * ifname, unsigned short eport,
int proto)
{
int r;
unsigned short iport;
in_addr_t iaddr;
r = priv_delete_redirect_rule(ifname, eport, proto, &iport, &iaddr, NULL, 0);
if(r == 0)
{
r = priv_delete_filter_rule(ifname, iport, proto, iaddr);
}
return r;
}
int
get_redirect_rule_by_index(int index,
char * ifname, unsigned short * eport,
char * iaddr, int iaddrlen, unsigned short * iport,
int * proto, char * desc, int desclen,
char * rhost, int rhostlen,
unsigned int * timestamp,
u_int64_t * packets, u_int64_t * bytes)
{
int n;
struct pfioc_rule pr;
#ifndef PF_NEWSTYLE
struct pfioc_pooladdr pp;
#endif
if(index < 0)
return -1;
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return -1;
}
memset(&pr, 0, sizeof(pr));
strlcpy(pr.anchor, anchor_name, MAXPATHLEN);
#ifndef PF_NEWSTYLE
pr.rule.action = PF_RDR;
#endif
if(ioctl(dev, DIOCGETRULES, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULES, ...): %m");
goto error;
}
n = pr.nr;
if(index >= n)
goto error;
pr.nr = index;
if(ioctl(dev, DIOCGETRULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULE): %m");
goto error;
}
*proto = pr.rule.proto;
#ifdef __APPLE__
*eport = ntohs(pr.rule.dst.xport.range.port[0]);
#else
*eport = ntohs(pr.rule.dst.port[0]);
#endif
#ifndef PF_NEWSTYLE
*iport = pr.rule.rpool.proxy_port[0];
#else
*iport = pr.rule.rdr.proxy_port[0];
#endif
if(ifname)
strlcpy(ifname, pr.rule.ifname, IFNAMSIZ);
if(desc)
strlcpy(desc, pr.rule.label, desclen);
#ifdef PFRULE_INOUT_COUNTS
if(packets)
*packets = pr.rule.packets[0] + pr.rule.packets[1];
if(bytes)
*bytes = pr.rule.bytes[0] + pr.rule.bytes[1];
#else
if(packets)
*packets = pr.rule.packets;
if(bytes)
*bytes = pr.rule.bytes;
#endif
#ifndef PF_NEWSTYLE
memset(&pp, 0, sizeof(pp));
strlcpy(pp.anchor, anchor_name, MAXPATHLEN);
pp.r_action = PF_RDR;
pp.r_num = index;
pp.ticket = pr.ticket;
if(ioctl(dev, DIOCGETADDRS, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETADDRS, ...): %m");
goto error;
}
if(pp.nr != 1)
{
syslog(LOG_NOTICE, "No address associated with pf rule");
goto error;
}
pp.nr = 0; /* first */
if(ioctl(dev, DIOCGETADDR, &pp) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETADDR, ...): %m");
goto error;
}
inet_ntop(AF_INET, &pp.addr.addr.v.a.addr.v4.s_addr,
iaddr, iaddrlen);
#else
inet_ntop(AF_INET, &pr.rule.rdr.addr.v.a.addr.v4.s_addr,
iaddr, iaddrlen);
#endif
if(rhost && rhostlen > 0)
{
if (pr.rule.src.addr.v.a.addr.v4.s_addr == 0)
{
rhost[0] = '\0'; /* empty string */
}
else
{
inet_ntop(AF_INET, &pr.rule.src.addr.v.a.addr.v4.s_addr,
rhost, rhostlen);
}
}
if(timestamp)
*timestamp = get_timestamp(*eport, *proto);
return 0;
error:
return -1;
}
/* return an (malloc'ed) array of "external" port for which there is
* a port mapping. number is the size of the array */
unsigned short *
get_portmappings_in_range(unsigned short startport, unsigned short endport,
int proto, unsigned int * number)
{
unsigned short * array;
unsigned int capacity;
int i, n;
unsigned short eport;
struct pfioc_rule pr;
*number = 0;
if(dev<0) {
syslog(LOG_ERR, "pf device is not open");
return NULL;
}
capacity = 128;
array = calloc(capacity, sizeof(unsigned short));
if(!array)
{
syslog(LOG_ERR, "get_portmappings_in_range() : calloc error");
return NULL;
}
memset(&pr, 0, sizeof(pr));
strlcpy(pr.anchor, anchor_name, MAXPATHLEN);
#ifndef PF_NEWSTYLE
pr.rule.action = PF_RDR;
#endif
if(ioctl(dev, DIOCGETRULES, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULES, ...): %m");
free(array);
return NULL;
}
n = pr.nr;
for(i=0; i<n; i++)
{
pr.nr = i;
if(ioctl(dev, DIOCGETRULE, &pr) < 0)
{
syslog(LOG_ERR, "ioctl(dev, DIOCGETRULE): %m");
continue;
}
#ifdef __APPLE__
eport = ntohs(pr.rule.dst.xport.range.port[0]);
if( (eport == ntohs(pr.rule.dst.xport.range.port[1]))
#else
eport = ntohs(pr.rule.dst.port[0]);
if( (eport == ntohs(pr.rule.dst.port[1]))
#endif
&& (pr.rule.proto == proto)
&& (startport <= eport) && (eport <= endport) )
{
if(*number >= capacity)
{
/* need to increase the capacity of the array */
unsigned short * tmp;
capacity += 128;
tmp = realloc(array, sizeof(unsigned short)*capacity);
if(!tmp)
{
syslog(LOG_ERR, "get_portmappings_in_range() : realloc(%lu) error", sizeof(unsigned short)*capacity);
*number = 0;
free(array);
return NULL;
}
array = tmp;
}
array[*number] = eport;
(*number)++;
}
}
return array;
}
/* update the port mapping internal port, decription and timestamp */
int
update_portmapping(const char * ifname, unsigned short eport, int proto,
unsigned short iport, const char * desc,
unsigned int timestamp)
{
unsigned short old_iport;
in_addr_t iaddr;
char iaddr_str[16];
char rhost[32];
if(priv_delete_redirect_rule(ifname, eport, proto, &old_iport, &iaddr, rhost, sizeof(rhost)) < 0)
return -1;
if (priv_delete_filter_rule(ifname, old_iport, proto, iaddr) < 0)
return -1;
inet_ntop(AF_INET, &iaddr, iaddr_str, sizeof(iaddr_str));
if(add_redirect_rule2(ifname, rhost, eport, iaddr_str, iport, proto,
desc, timestamp) < 0)
return -1;
if(add_filter_rule2(ifname, rhost, iaddr_str, eport, iport, proto, desc) < 0)
return -1;
return 0;
}
/* update the port mapping decription and timestamp */
int
update_portmapping_desc_timestamp(const char * ifname,
unsigned short eport, int proto,
const char * desc, unsigned int timestamp)
{
unsigned short iport;
in_addr_t iaddr;
char iaddr_str[16];
char rhost[32];
int r;
r = priv_delete_redirect_rule_check_desc(ifname, eport, proto, &iport, &iaddr, rhost, sizeof(rhost), 1, desc);
if(r < 0)
return -1;
if(r == 1) {
/* only change timestamp */
remove_timestamp_entry(eport, proto);
add_timestamp_entry(eport, proto, timestamp);
return 0;
}
if (priv_delete_filter_rule(ifname, iport, proto, iaddr) < 0)
return -1;
inet_ntop(AF_INET, &iaddr, iaddr_str, sizeof(iaddr_str));
if(add_redirect_rule2(ifname, rhost, eport, iaddr_str, iport, proto,
desc, timestamp) < 0)
return -1;
if(add_filter_rule2(ifname, rhost, iaddr_str, eport, iport, proto, desc) < 0)
return -1;
return 0;
}
/* this function is only for testing */
#if TEST
void
list_rules(void)
{
char buf[32];
char buf2[32];
int i, n;
struct pfioc_rule pr;
#ifndef PF_NEWSTYLE
struct pfioc_pooladdr pp;
#endif
if(dev<0)
{
perror("pf dev not open");
return ;
}
memset(&pr, 0, sizeof(pr));
strlcpy(pr.anchor, anchor_name, MAXPATHLEN);
pr.rule.action = PF_RDR;
if(ioctl(dev, DIOCGETRULES, &pr) < 0)
perror("DIOCGETRULES");
printf("ticket = %d, nr = %d\n", pr.ticket, pr.nr);
n = pr.nr;
for(i=0; i<n; i++)
{
printf("-- rule %d --\n", i);
pr.nr = i;
if(ioctl(dev, DIOCGETRULE, &pr) < 0)
perror("DIOCGETRULE");
printf(" %s %s %d:%d -> %s %d:%d proto %d keep_state=%d action=%d\n",
pr.rule.ifname,
inet_ntop(AF_INET, &pr.rule.src.addr.v.a.addr.v4.s_addr, buf, 32),
(int)ntohs(pr.rule.dst.port[0]),
(int)ntohs(pr.rule.dst.port[1]),
inet_ntop(AF_INET, &pr.rule.dst.addr.v.a.addr.v4.s_addr, buf2, 32),
#ifndef PF_NEWSTYLE
(int)pr.rule.rpool.proxy_port[0],
(int)pr.rule.rpool.proxy_port[1],
#else
(int)pr.rule.rdr.proxy_port[0],
(int)pr.rule.rdr.proxy_port[1],
#endif
(int)pr.rule.proto,
(int)pr.rule.keep_state,
(int)pr.rule.action);
printf(" description: \"%s\"\n", pr.rule.label);
#ifndef PF_NEWSTYLE
memset(&pp, 0, sizeof(pp));
strlcpy(pp.anchor, anchor_name, MAXPATHLEN);
pp.r_action = PF_RDR;
pp.r_num = i;
pp.ticket = pr.ticket;
if(ioctl(dev, DIOCGETADDRS, &pp) < 0)
perror("DIOCGETADDRS");
printf(" nb pool addr = %d ticket=%d\n", pp.nr, pp.ticket);
/*if(ioctl(dev, DIOCGETRULE, &pr) < 0)
perror("DIOCGETRULE"); */
pp.nr = 0; /* first */
if(ioctl(dev, DIOCGETADDR, &pp) < 0)
perror("DIOCGETADDR");
/* addr.v.a.addr.v4.s_addr */
printf(" %s\n", inet_ntop(AF_INET, &pp.addr.addr.v.a.addr.v4.s_addr, buf, 32));
#else
printf(" rule_flag=%08x action=%d direction=%d log=%d logif=%d "
"quick=%d ifnot=%d af=%d type=%d code=%d rdr.port_op=%d rdr.opts=%d\n",
pr.rule.rule_flag, pr.rule.action, pr.rule.direction,
pr.rule.log, pr.rule.logif, pr.rule.quick, pr.rule.ifnot,
pr.rule.af, pr.rule.type, pr.rule.code,
pr.rule.rdr.port_op, pr.rule.rdr.opts);
printf(" %s\n", inet_ntop(AF_INET, &pr.rule.rdr.addr.v.a.addr.v4.s_addr, buf, 32));
#endif
}
}
#endif /* TEST */
#endif /* USE_PF */
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