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freebsd/sbin/ipfw/nat.c

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/*
* Copyright (c) 2002-2003 Luigi Rizzo
* Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
* Copyright (c) 1994 Ugen J.S.Antsilevich
*
* Idea and grammar partially left from:
* Copyright (c) 1993 Daniel Boulet
*
* Redistribution and use in source forms, with and without modification,
* are permitted provided that this entire comment appears intact.
*
* Redistribution in binary form may occur without any restrictions.
* Obviously, it would be nice if you gave credit where credit is due
* but requiring it would be too onerous.
*
* This software is provided ``AS IS'' without any warranties of any kind.
*
* NEW command line interface for IP firewall facility
*
* $FreeBSD$
*
* In-kernel nat support
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include "ipfw2.h"
#include <ctype.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#define IPFW_INTERNAL /* Access to protected structures in ip_fw.h. */
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h> /* def. of struct route */
#include <netinet/in.h>
#include <netinet/ip_fw.h>
#include <arpa/inet.h>
#include <alias.h>
static struct _s_x nat_params[] = {
{ "ip", TOK_IP },
{ "if", TOK_IF },
{ "log", TOK_ALOG },
{ "deny_in", TOK_DENY_INC },
{ "same_ports", TOK_SAME_PORTS },
{ "unreg_only", TOK_UNREG_ONLY },
{ "reset", TOK_RESET_ADDR },
{ "reverse", TOK_ALIAS_REV },
{ "proxy_only", TOK_PROXY_ONLY },
{ "redirect_addr", TOK_REDIR_ADDR },
{ "redirect_port", TOK_REDIR_PORT },
{ "redirect_proto", TOK_REDIR_PROTO },
{ NULL, 0 } /* terminator */
};
/*
* Search for interface with name "ifn", and fill n accordingly:
*
* n->ip ip address of interface "ifn"
* n->if_name copy of interface name "ifn"
*/
static void
set_addr_dynamic(const char *ifn, struct cfg_nat *n)
{
size_t needed;
int mib[6];
char *buf, *lim, *next;
struct if_msghdr *ifm;
struct ifa_msghdr *ifam;
struct sockaddr_dl *sdl;
struct sockaddr_in *sin;
int ifIndex, ifMTU;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
/*
* Get interface data.
*/
if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
err(1, "iflist-sysctl-estimate");
buf = safe_calloc(1, needed);
if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1)
err(1, "iflist-sysctl-get");
lim = buf + needed;
/*
* Loop through interfaces until one with
* given name is found. This is done to
* find correct interface index for routing
* message processing.
*/
ifIndex = 0;
next = buf;
while (next < lim) {
ifm = (struct if_msghdr *)next;
next += ifm->ifm_msglen;
if (ifm->ifm_version != RTM_VERSION) {
if (co.verbose)
warnx("routing message version %d "
"not understood", ifm->ifm_version);
continue;
}
if (ifm->ifm_type == RTM_IFINFO) {
sdl = (struct sockaddr_dl *)(ifm + 1);
if (strlen(ifn) == sdl->sdl_nlen &&
strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) {
ifIndex = ifm->ifm_index;
ifMTU = ifm->ifm_data.ifi_mtu;
break;
}
}
}
if (!ifIndex)
errx(1, "unknown interface name %s", ifn);
/*
* Get interface address.
*/
sin = NULL;
while (next < lim) {
ifam = (struct ifa_msghdr *)next;
next += ifam->ifam_msglen;
if (ifam->ifam_version != RTM_VERSION) {
if (co.verbose)
warnx("routing message version %d "
"not understood", ifam->ifam_version);
continue;
}
if (ifam->ifam_type != RTM_NEWADDR)
break;
if (ifam->ifam_addrs & RTA_IFA) {
int i;
char *cp = (char *)(ifam + 1);
for (i = 1; i < RTA_IFA; i <<= 1) {
if (ifam->ifam_addrs & i)
cp += SA_SIZE((struct sockaddr *)cp);
}
if (((struct sockaddr *)cp)->sa_family == AF_INET) {
sin = (struct sockaddr_in *)cp;
break;
}
}
}
if (sin == NULL)
errx(1, "%s: cannot get interface address", ifn);
n->ip = sin->sin_addr;
strncpy(n->if_name, ifn, IF_NAMESIZE);
free(buf);
}
/*
* XXX - The following functions, macros and definitions come from natd.c:
* it would be better to move them outside natd.c, in a file
* (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live
* with it.
*/
/*
* Definition of a port range, and macros to deal with values.
* FORMAT: HI 16-bits == first port in range, 0 == all ports.
* LO 16-bits == number of ports in range
* NOTES: - Port values are not stored in network byte order.
*/
#define port_range u_long
#define GETLOPORT(x) ((x) >> 0x10)
#define GETNUMPORTS(x) ((x) & 0x0000ffff)
#define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x)))
/* Set y to be the low-port value in port_range variable x. */
#define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10))
/* Set y to be the number of ports in port_range variable x. */
#define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y))
static void
StrToAddr (const char* str, struct in_addr* addr)
{
struct hostent* hp;
if (inet_aton (str, addr))
return;
hp = gethostbyname (str);
if (!hp)
errx (1, "unknown host %s", str);
memcpy (addr, hp->h_addr, sizeof (struct in_addr));
}
static int
StrToPortRange (const char* str, const char* proto, port_range *portRange)
{
char* sep;
struct servent* sp;
char* end;
u_short loPort;
u_short hiPort;
/* First see if this is a service, return corresponding port if so. */
sp = getservbyname (str,proto);
if (sp) {
SETLOPORT(*portRange, ntohs(sp->s_port));
SETNUMPORTS(*portRange, 1);
return 0;
}
/* Not a service, see if it's a single port or port range. */
sep = strchr (str, '-');
if (sep == NULL) {
SETLOPORT(*portRange, strtol(str, &end, 10));
if (end != str) {
/* Single port. */
SETNUMPORTS(*portRange, 1);
return 0;
}
/* Error in port range field. */
errx (EX_DATAERR, "%s/%s: unknown service", str, proto);
}
/* Port range, get the values and sanity check. */
sscanf (str, "%hu-%hu", &loPort, &hiPort);
SETLOPORT(*portRange, loPort);
SETNUMPORTS(*portRange, 0); /* Error by default */
if (loPort <= hiPort)
SETNUMPORTS(*portRange, hiPort - loPort + 1);
if (GETNUMPORTS(*portRange) == 0)
errx (EX_DATAERR, "invalid port range %s", str);
return 0;
}
static int
StrToProto (const char* str)
{
if (!strcmp (str, "tcp"))
return IPPROTO_TCP;
if (!strcmp (str, "udp"))
return IPPROTO_UDP;
if (!strcmp (str, "sctp"))
return IPPROTO_SCTP;
errx (EX_DATAERR, "unknown protocol %s. Expected sctp, tcp or udp", str);
}
static int
StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto,
port_range *portRange)
{
char* ptr;
ptr = strchr (str, ':');
if (!ptr)
errx (EX_DATAERR, "%s is missing port number", str);
*ptr = '\0';
++ptr;
StrToAddr (str, addr);
return StrToPortRange (ptr, proto, portRange);
}
/* End of stuff taken from natd.c. */
#define INC_ARGCV() do { \
(*_av)++; \
(*_ac)--; \
av = *_av; \
ac = *_ac; \
} while(0)
/*
* The next 3 functions add support for the addr, port and proto redirect and
* their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect()
* and SetupProtoRedirect() from natd.c.
*
* Every setup_* function fills at least one redirect entry
* (struct cfg_redir) and zero or more server pool entry (struct cfg_spool)
* in buf.
*
* The format of data in buf is:
*
*
* cfg_nat cfg_redir cfg_spool ...... cfg_spool
*
* ------------------------------------- ------------
* | | .....X ... | | | | .....
* ------------------------------------- ...... ------------
* ^
* spool_cnt n=0 ...... n=(X-1)
*
* len points to the amount of available space in buf
* space counts the memory consumed by every function
*
* XXX - Every function get all the argv params so it
* has to check, in optional parameters, that the next
* args is a valid option for the redir entry and not
* another token. Only redir_port and redir_proto are
* affected by this.
*/
static int
setup_redir_addr(char *spool_buf, unsigned int len,
int *_ac, char ***_av)
{
char **av, *sep; /* Token separator. */
/* Temporary buffer used to hold server pool ip's. */
char tmp_spool_buf[NAT_BUF_LEN];
int ac, space, lsnat;
struct cfg_redir *r;
struct cfg_spool *tmp;
av = *_av;
ac = *_ac;
space = 0;
lsnat = 0;
if (len >= SOF_REDIR) {
r = (struct cfg_redir *)spool_buf;
/* Skip cfg_redir at beginning of buf. */
spool_buf = &spool_buf[SOF_REDIR];
space = SOF_REDIR;
len -= SOF_REDIR;
} else
goto nospace;
r->mode = REDIR_ADDR;
/* Extract local address. */
if (ac == 0)
errx(EX_DATAERR, "redirect_addr: missing local address");
sep = strchr(*av, ',');
if (sep) { /* LSNAT redirection syntax. */
r->laddr.s_addr = INADDR_NONE;
/* Preserve av, copy spool servers to tmp_spool_buf. */
strncpy(tmp_spool_buf, *av, strlen(*av)+1);
lsnat = 1;
} else
StrToAddr(*av, &r->laddr);
INC_ARGCV();
/* Extract public address. */
if (ac == 0)
errx(EX_DATAERR, "redirect_addr: missing public address");
StrToAddr(*av, &r->paddr);
INC_ARGCV();
/* Setup LSNAT server pool. */
if (sep) {
sep = strtok(tmp_spool_buf, ",");
while (sep != NULL) {
tmp = (struct cfg_spool *)spool_buf;
if (len < SOF_SPOOL)
goto nospace;
len -= SOF_SPOOL;
space += SOF_SPOOL;
StrToAddr(sep, &tmp->addr);
tmp->port = ~0;
r->spool_cnt++;
/* Point to the next possible cfg_spool. */
spool_buf = &spool_buf[SOF_SPOOL];
sep = strtok(NULL, ",");
}
}
return(space);
nospace:
errx(EX_DATAERR, "redirect_addr: buf is too small\n");
}
static int
setup_redir_port(char *spool_buf, unsigned int len,
int *_ac, char ***_av)
{
char **av, *sep, *protoName;
char tmp_spool_buf[NAT_BUF_LEN];
int ac, space, lsnat;
struct cfg_redir *r;
struct cfg_spool *tmp;
u_short numLocalPorts;
port_range portRange;
av = *_av;
ac = *_ac;
space = 0;
lsnat = 0;
numLocalPorts = 0;
if (len >= SOF_REDIR) {
r = (struct cfg_redir *)spool_buf;
/* Skip cfg_redir at beginning of buf. */
spool_buf = &spool_buf[SOF_REDIR];
space = SOF_REDIR;
len -= SOF_REDIR;
} else
goto nospace;
r->mode = REDIR_PORT;
/*
* Extract protocol.
*/
if (ac == 0)
errx (EX_DATAERR, "redirect_port: missing protocol");
r->proto = StrToProto(*av);
protoName = *av;
INC_ARGCV();
/*
* Extract local address.
*/
if (ac == 0)
errx (EX_DATAERR, "redirect_port: missing local address");
sep = strchr(*av, ',');
/* LSNAT redirection syntax. */
if (sep) {
r->laddr.s_addr = INADDR_NONE;
r->lport = ~0;
numLocalPorts = 1;
/* Preserve av, copy spool servers to tmp_spool_buf. */
strncpy(tmp_spool_buf, *av, strlen(*av)+1);
lsnat = 1;
} else {
/*
* The sctp nat does not allow the port numbers to be mapped to
* new port numbers. Therefore, no ports are to be specified
* in the target port field.
*/
if (r->proto == IPPROTO_SCTP) {
if (strchr (*av, ':'))
errx(EX_DATAERR, "redirect_port:"
"port numbers do not change in sctp, so do not "
"specify them as part of the target");
else
StrToAddr(*av, &r->laddr);
} else {
if (StrToAddrAndPortRange (*av, &r->laddr, protoName,
&portRange) != 0)
errx(EX_DATAERR, "redirect_port:"
"invalid local port range");
r->lport = GETLOPORT(portRange);
numLocalPorts = GETNUMPORTS(portRange);
}
}
INC_ARGCV();
/*
* Extract public port and optionally address.
*/
if (ac == 0)
errx (EX_DATAERR, "redirect_port: missing public port");
sep = strchr (*av, ':');
if (sep) {
if (StrToAddrAndPortRange (*av, &r->paddr, protoName,
&portRange) != 0)
errx(EX_DATAERR, "redirect_port:"
"invalid public port range");
} else {
r->paddr.s_addr = INADDR_ANY;
if (StrToPortRange (*av, protoName, &portRange) != 0)
errx(EX_DATAERR, "redirect_port:"
"invalid public port range");
}
r->pport = GETLOPORT(portRange);
if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */
numLocalPorts = GETNUMPORTS(portRange);
r->lport = r->pport;
}
r->pport_cnt = GETNUMPORTS(portRange);
INC_ARGCV();
/*
* Extract remote address and optionally port.
*/
/*
* NB: isalpha(**av) => we've to check that next parameter is really an
* option for this redirect entry, else stop here processing arg[cv].
*/
if (ac != 0 && !isalpha(**av)) {
sep = strchr (*av, ':');
if (sep) {
if (StrToAddrAndPortRange (*av, &r->raddr, protoName,
&portRange) != 0)
errx(EX_DATAERR, "redirect_port:"
"invalid remote port range");
} else {
SETLOPORT(portRange, 0);
SETNUMPORTS(portRange, 1);
StrToAddr (*av, &r->raddr);
}
INC_ARGCV();
} else {
SETLOPORT(portRange, 0);
SETNUMPORTS(portRange, 1);
r->raddr.s_addr = INADDR_ANY;
}
r->rport = GETLOPORT(portRange);
r->rport_cnt = GETNUMPORTS(portRange);
/*
* Make sure port ranges match up, then add the redirect ports.
*/
if (numLocalPorts != r->pport_cnt)
errx(EX_DATAERR, "redirect_port:"
"port ranges must be equal in size");
/* Remote port range is allowed to be '0' which means all ports. */
if (r->rport_cnt != numLocalPorts &&
(r->rport_cnt != 1 || r->rport != 0))
errx(EX_DATAERR, "redirect_port: remote port must"
"be 0 or equal to local port range in size");
/*
* Setup LSNAT server pool.
*/
if (lsnat) {
sep = strtok(tmp_spool_buf, ",");
while (sep != NULL) {
tmp = (struct cfg_spool *)spool_buf;
if (len < SOF_SPOOL)
goto nospace;
len -= SOF_SPOOL;
space += SOF_SPOOL;
/*
* The sctp nat does not allow the port numbers to be mapped to new port numbers
* Therefore, no ports are to be specified in the target port field
*/
if (r->proto == IPPROTO_SCTP) {
if (strchr (sep, ':')) {
errx(EX_DATAERR, "redirect_port:"
"port numbers do not change in "
"sctp, so do not specify them as "
"part of the target");
} else {
StrToAddr(sep, &tmp->addr);
tmp->port = r->pport;
}
} else {
if (StrToAddrAndPortRange(sep, &tmp->addr,
protoName, &portRange) != 0)
errx(EX_DATAERR, "redirect_port:"
"invalid local port range");
if (GETNUMPORTS(portRange) != 1)
errx(EX_DATAERR, "redirect_port: "
"local port must be single in "
"this context");
tmp->port = GETLOPORT(portRange);
}
r->spool_cnt++;
/* Point to the next possible cfg_spool. */
spool_buf = &spool_buf[SOF_SPOOL];
sep = strtok(NULL, ",");
}
}
return (space);
nospace:
errx(EX_DATAERR, "redirect_port: buf is too small\n");
}
static int
setup_redir_proto(char *spool_buf, unsigned int len,
int *_ac, char ***_av)
{
char **av;
int ac, space;
struct protoent *protoent;
struct cfg_redir *r;
av = *_av;
ac = *_ac;
if (len >= SOF_REDIR) {
r = (struct cfg_redir *)spool_buf;
/* Skip cfg_redir at beginning of buf. */
spool_buf = &spool_buf[SOF_REDIR];
space = SOF_REDIR;
len -= SOF_REDIR;
} else
goto nospace;
r->mode = REDIR_PROTO;
/*
* Extract protocol.
*/
if (ac == 0)
errx(EX_DATAERR, "redirect_proto: missing protocol");
protoent = getprotobyname(*av);
if (protoent == NULL)
errx(EX_DATAERR, "redirect_proto: unknown protocol %s", *av);
else
r->proto = protoent->p_proto;
INC_ARGCV();
/*
* Extract local address.
*/
if (ac == 0)
errx(EX_DATAERR, "redirect_proto: missing local address");
else
StrToAddr(*av, &r->laddr);
INC_ARGCV();
/*
* Extract optional public address.
*/
if (ac == 0) {
r->paddr.s_addr = INADDR_ANY;
r->raddr.s_addr = INADDR_ANY;
} else {
/* see above in setup_redir_port() */
if (!isalpha(**av)) {
StrToAddr(*av, &r->paddr);
INC_ARGCV();
/*
* Extract optional remote address.
*/
/* see above in setup_redir_port() */
if (ac!=0 && !isalpha(**av)) {
StrToAddr(*av, &r->raddr);
INC_ARGCV();
}
}
}
return (space);
nospace:
errx(EX_DATAERR, "redirect_proto: buf is too small\n");
}
static void
print_nat_config(unsigned char *buf)
{
struct cfg_nat *n;
int i, cnt, flag, off;
struct cfg_redir *t;
struct cfg_spool *s;
struct protoent *p;
n = (struct cfg_nat *)buf;
flag = 1;
off = sizeof(*n);
printf("ipfw nat %u config", n->id);
if (strlen(n->if_name) != 0)
printf(" if %s", n->if_name);
else if (n->ip.s_addr != 0)
printf(" ip %s", inet_ntoa(n->ip));
while (n->mode != 0) {
if (n->mode & PKT_ALIAS_LOG) {
printf(" log");
n->mode &= ~PKT_ALIAS_LOG;
} else if (n->mode & PKT_ALIAS_DENY_INCOMING) {
printf(" deny_in");
n->mode &= ~PKT_ALIAS_DENY_INCOMING;
} else if (n->mode & PKT_ALIAS_SAME_PORTS) {
printf(" same_ports");
n->mode &= ~PKT_ALIAS_SAME_PORTS;
} else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) {
printf(" unreg_only");
n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY;
} else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) {
printf(" reset");
n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE;
} else if (n->mode & PKT_ALIAS_REVERSE) {
printf(" reverse");
n->mode &= ~PKT_ALIAS_REVERSE;
} else if (n->mode & PKT_ALIAS_PROXY_ONLY) {
printf(" proxy_only");
n->mode &= ~PKT_ALIAS_PROXY_ONLY;
}
}
/* Print all the redirect's data configuration. */
for (cnt = 0; cnt < n->redir_cnt; cnt++) {
t = (struct cfg_redir *)&buf[off];
off += SOF_REDIR;
switch (t->mode) {
case REDIR_ADDR:
printf(" redirect_addr");
if (t->spool_cnt == 0)
printf(" %s", inet_ntoa(t->laddr));
else
for (i = 0; i < t->spool_cnt; i++) {
s = (struct cfg_spool *)&buf[off];
if (i)
printf(",");
else
printf(" ");
printf("%s", inet_ntoa(s->addr));
off += SOF_SPOOL;
}
printf(" %s", inet_ntoa(t->paddr));
break;
case REDIR_PORT:
p = getprotobynumber(t->proto);
printf(" redirect_port %s ", p->p_name);
if (!t->spool_cnt) {
printf("%s:%u", inet_ntoa(t->laddr), t->lport);
if (t->pport_cnt > 1)
printf("-%u", t->lport +
t->pport_cnt - 1);
} else
for (i=0; i < t->spool_cnt; i++) {
s = (struct cfg_spool *)&buf[off];
if (i)
printf(",");
printf("%s:%u", inet_ntoa(s->addr),
s->port);
off += SOF_SPOOL;
}
printf(" ");
if (t->paddr.s_addr)
printf("%s:", inet_ntoa(t->paddr));
printf("%u", t->pport);
if (!t->spool_cnt && t->pport_cnt > 1)
printf("-%u", t->pport + t->pport_cnt - 1);
if (t->raddr.s_addr) {
printf(" %s", inet_ntoa(t->raddr));
if (t->rport) {
printf(":%u", t->rport);
if (!t->spool_cnt && t->rport_cnt > 1)
printf("-%u", t->rport +
t->rport_cnt - 1);
}
}
break;
case REDIR_PROTO:
p = getprotobynumber(t->proto);
printf(" redirect_proto %s %s", p->p_name,
inet_ntoa(t->laddr));
if (t->paddr.s_addr != 0) {
printf(" %s", inet_ntoa(t->paddr));
if (t->raddr.s_addr)
printf(" %s", inet_ntoa(t->raddr));
}
break;
default:
errx(EX_DATAERR, "unknown redir mode");
break;
}
}
printf("\n");
}
void
ipfw_config_nat(int ac, char **av)
{
struct cfg_nat *n; /* Nat instance configuration. */
int i, len, off, tok;
char *id, buf[NAT_BUF_LEN]; /* Buffer for serialized data. */
len = NAT_BUF_LEN;
/* Offset in buf: save space for n at the beginning. */
off = sizeof(*n);
memset(buf, 0, sizeof(buf));
n = (struct cfg_nat *)buf;
av++; ac--;
/* Nat id. */
if (ac && isdigit(**av)) {
id = *av;
i = atoi(*av);
ac--; av++;
n->id = i;
} else
errx(EX_DATAERR, "missing nat id");
if (ac == 0)
errx(EX_DATAERR, "missing option");
while (ac > 0) {
tok = match_token(nat_params, *av);
ac--; av++;
switch (tok) {
case TOK_IP:
if (ac == 0)
errx(EX_DATAERR, "missing option");
if (!inet_aton(av[0], &(n->ip)))
errx(EX_DATAERR, "bad ip address ``%s''",
av[0]);
ac--; av++;
break;
case TOK_IF:
if (ac == 0)
errx(EX_DATAERR, "missing option");
set_addr_dynamic(av[0], n);
ac--; av++;
break;
case TOK_ALOG:
n->mode |= PKT_ALIAS_LOG;
break;
case TOK_DENY_INC:
n->mode |= PKT_ALIAS_DENY_INCOMING;
break;
case TOK_SAME_PORTS:
n->mode |= PKT_ALIAS_SAME_PORTS;
break;
case TOK_UNREG_ONLY:
n->mode |= PKT_ALIAS_UNREGISTERED_ONLY;
break;
case TOK_RESET_ADDR:
n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE;
break;
case TOK_ALIAS_REV:
n->mode |= PKT_ALIAS_REVERSE;
break;
case TOK_PROXY_ONLY:
n->mode |= PKT_ALIAS_PROXY_ONLY;
break;
/*
* All the setup_redir_* functions work directly in the final
* buffer, see above for details.
*/
case TOK_REDIR_ADDR:
case TOK_REDIR_PORT:
case TOK_REDIR_PROTO:
switch (tok) {
case TOK_REDIR_ADDR:
i = setup_redir_addr(&buf[off], len, &ac, &av);
break;
case TOK_REDIR_PORT:
i = setup_redir_port(&buf[off], len, &ac, &av);
break;
case TOK_REDIR_PROTO:
i = setup_redir_proto(&buf[off], len, &ac, &av);
break;
}
n->redir_cnt++;
off += i;
len -= i;
break;
default:
errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]);
}
}
i = do_cmd(IP_FW_NAT_CFG, buf, off);
if (i)
err(1, "setsockopt(%s)", "IP_FW_NAT_CFG");
if (!co.do_quiet) {
/* After every modification, we show the resultant rule. */
int _ac = 3;
const char *_av[] = {"show", "config", id};
ipfw_show_nat(_ac, (char **)(void *)_av);
}
}
void
ipfw_show_nat(int ac, char **av)
{
struct cfg_nat *n;
struct cfg_redir *e;
int cmd, i, nbytes, do_cfg, do_rule, frule, lrule, nalloc, size;
int nat_cnt, redir_cnt, r;
uint8_t *data, *p;
char *endptr;
do_rule = 0;
nalloc = 1024;
size = 0;
data = NULL;
frule = 0;
lrule = IPFW_DEFAULT_RULE; /* max ipfw rule number */
ac--; av++;
if (co.test_only)
return;
/* Parse parameters. */
for (cmd = IP_FW_NAT_GET_LOG, do_cfg = 0; ac != 0; ac--, av++) {
if (!strncmp(av[0], "config", strlen(av[0]))) {
cmd = IP_FW_NAT_GET_CONFIG, do_cfg = 1;
continue;
}
/* Convert command line rule #. */
frule = lrule = strtoul(av[0], &endptr, 10);
if (*endptr == '-')
lrule = strtoul(endptr+1, &endptr, 10);
if (lrule == 0)
err(EX_USAGE, "invalid rule number: %s", av[0]);
do_rule = 1;
}
nbytes = nalloc;
while (nbytes >= nalloc) {
nalloc = nalloc * 2;
nbytes = nalloc;
data = safe_realloc(data, nbytes);
if (do_cmd(cmd, data, (uintptr_t)&nbytes) < 0)
err(EX_OSERR, "getsockopt(IP_FW_GET_%s)",
(cmd == IP_FW_NAT_GET_LOG) ? "LOG" : "CONFIG");
}
if (nbytes == 0)
exit(0);
if (do_cfg) {
nat_cnt = *((int *)data);
for (i = sizeof(nat_cnt); nat_cnt; nat_cnt--) {
n = (struct cfg_nat *)&data[i];
if (frule <= n->id && lrule >= n->id)
print_nat_config(&data[i]);
i += sizeof(struct cfg_nat);
for (redir_cnt = 0; redir_cnt < n->redir_cnt; redir_cnt++) {
e = (struct cfg_redir *)&data[i];
i += sizeof(struct cfg_redir) + e->spool_cnt *
sizeof(struct cfg_spool);
}
}
} else {
for (i = 0; 1; i += LIBALIAS_BUF_SIZE + sizeof(int)) {
p = &data[i];
if (p == data + nbytes)
break;
bcopy(p, &r, sizeof(int));
if (do_rule) {
if (!(frule <= r && lrule >= r))
continue;
}
printf("nat %u: %s\n", r, p+sizeof(int));
}
}
}
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