+++ /dev/null
-/*
- * 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: head/sbin/ipfw/nat.c 187770 2009-01-27 12:01:30Z luigi $
- *
- * 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 targetport 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));
- }
- }
-}
git://git.onelab.eu / ipfw.git / blobdiff