mirror of
https://git.FreeBSD.org/src.git
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b7684f4b85
Reviewed by: melifaro Approved by: bapt (mentor) Differential Revision: D3473
1113 lines
26 KiB
C
1113 lines
26 KiB
C
/*
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* Copyright (c) 2002-2003 Luigi Rizzo
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* Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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*
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* Idea and grammar partially left from:
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* Copyright (c) 1993 Daniel Boulet
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*
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* NEW command line interface for IP firewall facility
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*
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* $FreeBSD$
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*
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* In-kernel nat support
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include "ipfw2.h"
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.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 <sysexits.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h> /* def. of struct route */
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#include <netinet/in.h>
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#include <netinet/ip_fw.h>
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#include <arpa/inet.h>
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#include <alias.h>
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typedef int (nat_cb_t)(struct nat44_cfg_nat *cfg, void *arg);
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static void nat_show_cfg(struct nat44_cfg_nat *n, void *arg);
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static void nat_show_log(struct nat44_cfg_nat *n, void *arg);
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static int nat_show_data(struct nat44_cfg_nat *cfg, void *arg);
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static int natname_cmp(const void *a, const void *b);
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static int nat_foreach(nat_cb_t *f, void *arg, int sort);
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static int nat_get_cmd(char *name, uint16_t cmd, ipfw_obj_header **ooh);
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static struct _s_x nat_params[] = {
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{ "ip", TOK_IP },
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{ "if", TOK_IF },
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{ "log", TOK_ALOG },
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{ "deny_in", TOK_DENY_INC },
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{ "same_ports", TOK_SAME_PORTS },
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{ "unreg_only", TOK_UNREG_ONLY },
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{ "skip_global", TOK_SKIP_GLOBAL },
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{ "reset", TOK_RESET_ADDR },
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{ "reverse", TOK_ALIAS_REV },
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{ "proxy_only", TOK_PROXY_ONLY },
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{ "redirect_addr", TOK_REDIR_ADDR },
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{ "redirect_port", TOK_REDIR_PORT },
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{ "redirect_proto", TOK_REDIR_PROTO },
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{ NULL, 0 } /* terminator */
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};
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/*
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* Search for interface with name "ifn", and fill n accordingly:
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*
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* n->ip ip address of interface "ifn"
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* n->if_name copy of interface name "ifn"
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*/
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static void
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set_addr_dynamic(const char *ifn, struct nat44_cfg_nat *n)
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{
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size_t needed;
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int mib[6];
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char *buf, *lim, *next;
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struct if_msghdr *ifm;
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struct ifa_msghdr *ifam;
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struct sockaddr_dl *sdl;
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struct sockaddr_in *sin;
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int ifIndex;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = AF_INET;
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mib[4] = NET_RT_IFLIST;
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mib[5] = 0;
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/*
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* Get interface data.
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*/
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
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err(1, "iflist-sysctl-estimate");
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buf = safe_calloc(1, needed);
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if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1)
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err(1, "iflist-sysctl-get");
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lim = buf + needed;
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/*
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* Loop through interfaces until one with
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* given name is found. This is done to
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* find correct interface index for routing
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* message processing.
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*/
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ifIndex = 0;
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next = buf;
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while (next < lim) {
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ifm = (struct if_msghdr *)next;
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next += ifm->ifm_msglen;
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if (ifm->ifm_version != RTM_VERSION) {
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if (co.verbose)
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warnx("routing message version %d "
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"not understood", ifm->ifm_version);
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continue;
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}
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if (ifm->ifm_type == RTM_IFINFO) {
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sdl = (struct sockaddr_dl *)(ifm + 1);
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if (strlen(ifn) == sdl->sdl_nlen &&
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strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) {
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ifIndex = ifm->ifm_index;
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break;
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}
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}
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}
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if (!ifIndex)
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errx(1, "unknown interface name %s", ifn);
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/*
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* Get interface address.
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*/
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sin = NULL;
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while (next < lim) {
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ifam = (struct ifa_msghdr *)next;
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next += ifam->ifam_msglen;
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if (ifam->ifam_version != RTM_VERSION) {
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if (co.verbose)
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warnx("routing message version %d "
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"not understood", ifam->ifam_version);
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continue;
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}
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if (ifam->ifam_type != RTM_NEWADDR)
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break;
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if (ifam->ifam_addrs & RTA_IFA) {
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int i;
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char *cp = (char *)(ifam + 1);
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for (i = 1; i < RTA_IFA; i <<= 1) {
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if (ifam->ifam_addrs & i)
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cp += SA_SIZE((struct sockaddr *)cp);
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}
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if (((struct sockaddr *)cp)->sa_family == AF_INET) {
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sin = (struct sockaddr_in *)cp;
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break;
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}
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}
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}
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if (sin == NULL)
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n->ip.s_addr = htonl(INADDR_ANY);
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else
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n->ip = sin->sin_addr;
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strncpy(n->if_name, ifn, IF_NAMESIZE);
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free(buf);
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}
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/*
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* XXX - The following functions, macros and definitions come from natd.c:
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* it would be better to move them outside natd.c, in a file
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* (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live
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* with it.
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*/
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/*
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* Definition of a port range, and macros to deal with values.
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* FORMAT: HI 16-bits == first port in range, 0 == all ports.
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* LO 16-bits == number of ports in range
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* NOTES: - Port values are not stored in network byte order.
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*/
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#define port_range u_long
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#define GETLOPORT(x) ((x) >> 0x10)
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#define GETNUMPORTS(x) ((x) & 0x0000ffff)
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#define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x)))
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/* Set y to be the low-port value in port_range variable x. */
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#define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10))
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/* Set y to be the number of ports in port_range variable x. */
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#define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y))
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static void
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StrToAddr (const char* str, struct in_addr* addr)
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{
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struct hostent* hp;
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if (inet_aton (str, addr))
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return;
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hp = gethostbyname (str);
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if (!hp)
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errx (1, "unknown host %s", str);
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memcpy (addr, hp->h_addr, sizeof (struct in_addr));
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}
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static int
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StrToPortRange (const char* str, const char* proto, port_range *portRange)
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{
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char* sep;
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struct servent* sp;
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char* end;
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u_short loPort;
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u_short hiPort;
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/* First see if this is a service, return corresponding port if so. */
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sp = getservbyname (str,proto);
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if (sp) {
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SETLOPORT(*portRange, ntohs(sp->s_port));
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SETNUMPORTS(*portRange, 1);
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return 0;
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}
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/* Not a service, see if it's a single port or port range. */
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sep = strchr (str, '-');
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if (sep == NULL) {
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SETLOPORT(*portRange, strtol(str, &end, 10));
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if (end != str) {
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/* Single port. */
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SETNUMPORTS(*portRange, 1);
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return 0;
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}
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/* Error in port range field. */
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errx (EX_DATAERR, "%s/%s: unknown service", str, proto);
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}
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/* Port range, get the values and sanity check. */
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sscanf (str, "%hu-%hu", &loPort, &hiPort);
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SETLOPORT(*portRange, loPort);
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SETNUMPORTS(*portRange, 0); /* Error by default */
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if (loPort <= hiPort)
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SETNUMPORTS(*portRange, hiPort - loPort + 1);
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if (GETNUMPORTS(*portRange) == 0)
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errx (EX_DATAERR, "invalid port range %s", str);
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return 0;
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}
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static int
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StrToProto (const char* str)
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{
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if (!strcmp (str, "tcp"))
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return IPPROTO_TCP;
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if (!strcmp (str, "udp"))
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return IPPROTO_UDP;
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if (!strcmp (str, "sctp"))
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return IPPROTO_SCTP;
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errx (EX_DATAERR, "unknown protocol %s. Expected sctp, tcp or udp", str);
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}
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static int
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StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto,
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port_range *portRange)
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{
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char* ptr;
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ptr = strchr (str, ':');
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if (!ptr)
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errx (EX_DATAERR, "%s is missing port number", str);
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*ptr = '\0';
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++ptr;
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StrToAddr (str, addr);
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return StrToPortRange (ptr, proto, portRange);
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}
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/* End of stuff taken from natd.c. */
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/*
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* The next 3 functions add support for the addr, port and proto redirect and
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* their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect()
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* and SetupProtoRedirect() from natd.c.
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*
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* Every setup_* function fills at least one redirect entry
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* (struct nat44_cfg_redir) and zero or more server pool entry
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* (struct nat44_cfg_spool) in buf.
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*
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* The format of data in buf is:
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*
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* nat44_cfg_nat nat44_cfg_redir nat44_cfg_spool ...... nat44_cfg_spool
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*
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* ------------------------------------- ------------
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* | | .....X ..... | | | | .....
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* ------------------------------------- ...... ------------
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* ^
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* spool_cnt n=0 ...... n=(X-1)
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*
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* len points to the amount of available space in buf
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* space counts the memory consumed by every function
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*
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* XXX - Every function get all the argv params so it
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* has to check, in optional parameters, that the next
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* args is a valid option for the redir entry and not
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* another token. Only redir_port and redir_proto are
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* affected by this.
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*/
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static int
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estimate_redir_addr(int *ac, char ***av)
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{
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size_t space = sizeof(struct nat44_cfg_redir);
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char *sep = **av;
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u_int c = 0;
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(void)ac; /* UNUSED */
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while ((sep = strchr(sep, ',')) != NULL) {
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c++;
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sep++;
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}
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if (c > 0)
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c++;
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space += c * sizeof(struct nat44_cfg_spool);
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return (space);
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}
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static int
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setup_redir_addr(char *buf, int *ac, char ***av)
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{
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struct nat44_cfg_redir *r;
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char *sep;
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size_t space;
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r = (struct nat44_cfg_redir *)buf;
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r->mode = REDIR_ADDR;
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/* Skip nat44_cfg_redir at beginning of buf. */
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buf = &buf[sizeof(struct nat44_cfg_redir)];
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space = sizeof(struct nat44_cfg_redir);
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/* Extract local address. */
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if (strchr(**av, ',') != NULL) {
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struct nat44_cfg_spool *spool;
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/* Setup LSNAT server pool. */
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r->laddr.s_addr = INADDR_NONE;
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sep = strtok(**av, ",");
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while (sep != NULL) {
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spool = (struct nat44_cfg_spool *)buf;
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space += sizeof(struct nat44_cfg_spool);
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StrToAddr(sep, &spool->addr);
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spool->port = ~0;
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r->spool_cnt++;
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/* Point to the next possible nat44_cfg_spool. */
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buf = &buf[sizeof(struct nat44_cfg_spool)];
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sep = strtok(NULL, ",");
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}
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} else
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StrToAddr(**av, &r->laddr);
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(*av)++; (*ac)--;
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/* Extract public address. */
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StrToAddr(**av, &r->paddr);
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(*av)++; (*ac)--;
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return (space);
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}
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static int
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estimate_redir_port(int *ac, char ***av)
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{
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size_t space = sizeof(struct nat44_cfg_redir);
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char *sep = **av;
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u_int c = 0;
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(void)ac; /* UNUSED */
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while ((sep = strchr(sep, ',')) != NULL) {
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c++;
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sep++;
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}
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if (c > 0)
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c++;
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space += c * sizeof(struct nat44_cfg_spool);
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return (space);
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}
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static int
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setup_redir_port(char *buf, int *ac, char ***av)
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{
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struct nat44_cfg_redir *r;
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char *sep, *protoName, *lsnat = NULL;
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size_t space;
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u_short numLocalPorts;
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port_range portRange;
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numLocalPorts = 0;
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r = (struct nat44_cfg_redir *)buf;
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r->mode = REDIR_PORT;
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/* Skip nat44_cfg_redir at beginning of buf. */
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buf = &buf[sizeof(struct nat44_cfg_redir)];
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space = sizeof(struct nat44_cfg_redir);
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/*
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* Extract protocol.
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*/
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r->proto = StrToProto(**av);
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protoName = **av;
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(*av)++; (*ac)--;
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/*
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* Extract local address.
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*/
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if (strchr(**av, ',') != NULL) {
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r->laddr.s_addr = INADDR_NONE;
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r->lport = ~0;
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numLocalPorts = 1;
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lsnat = **av;
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} else {
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/*
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* The sctp nat does not allow the port numbers to be mapped to
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* new port numbers. Therefore, no ports are to be specified
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* in the target port field.
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*/
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if (r->proto == IPPROTO_SCTP) {
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if (strchr(**av, ':'))
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errx(EX_DATAERR, "redirect_port:"
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"port numbers do not change in sctp, so do "
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"not specify them as part of the target");
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else
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StrToAddr(**av, &r->laddr);
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} else {
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if (StrToAddrAndPortRange(**av, &r->laddr, protoName,
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&portRange) != 0)
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errx(EX_DATAERR, "redirect_port: "
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"invalid local port range");
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r->lport = GETLOPORT(portRange);
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numLocalPorts = GETNUMPORTS(portRange);
|
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}
|
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}
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(*av)++; (*ac)--;
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/*
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* Extract public port and optionally address.
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*/
|
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if (strchr(**av, ':') != NULL) {
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if (StrToAddrAndPortRange(**av, &r->paddr, protoName,
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&portRange) != 0)
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errx(EX_DATAERR, "redirect_port: "
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"invalid public port range");
|
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} else {
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r->paddr.s_addr = INADDR_ANY;
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if (StrToPortRange(**av, protoName, &portRange) != 0)
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errx(EX_DATAERR, "redirect_port: "
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"invalid public port range");
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}
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r->pport = GETLOPORT(portRange);
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if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */
|
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numLocalPorts = GETNUMPORTS(portRange);
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r->lport = r->pport;
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}
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r->pport_cnt = GETNUMPORTS(portRange);
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(*av)++; (*ac)--;
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|
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/*
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* Extract remote address and optionally port.
|
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*/
|
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/*
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* NB: isdigit(**av) => we've to check that next parameter is really an
|
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* option for this redirect entry, else stop here processing arg[cv].
|
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*/
|
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if (*ac != 0 && isdigit(***av)) {
|
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if (strchr(**av, ':') != NULL) {
|
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if (StrToAddrAndPortRange(**av, &r->raddr, protoName,
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&portRange) != 0)
|
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errx(EX_DATAERR, "redirect_port: "
|
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"invalid remote port range");
|
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} else {
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SETLOPORT(portRange, 0);
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SETNUMPORTS(portRange, 1);
|
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StrToAddr(**av, &r->raddr);
|
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}
|
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(*av)++; (*ac)--;
|
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} else {
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SETLOPORT(portRange, 0);
|
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SETNUMPORTS(portRange, 1);
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r->raddr.s_addr = INADDR_ANY;
|
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}
|
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r->rport = GETLOPORT(portRange);
|
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r->rport_cnt = GETNUMPORTS(portRange);
|
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|
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/*
|
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* 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 != NULL) {
|
|
struct nat44_cfg_spool *spool;
|
|
|
|
sep = strtok(lsnat, ",");
|
|
while (sep != NULL) {
|
|
spool = (struct nat44_cfg_spool *)buf;
|
|
space += sizeof(struct nat44_cfg_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, &spool->addr);
|
|
spool->port = r->pport;
|
|
}
|
|
} else {
|
|
if (StrToAddrAndPortRange(sep, &spool->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");
|
|
spool->port = GETLOPORT(portRange);
|
|
}
|
|
r->spool_cnt++;
|
|
/* Point to the next possible nat44_cfg_spool. */
|
|
buf = &buf[sizeof(struct nat44_cfg_spool)];
|
|
sep = strtok(NULL, ",");
|
|
}
|
|
}
|
|
|
|
return (space);
|
|
}
|
|
|
|
static int
|
|
setup_redir_proto(char *buf, int *ac, char ***av)
|
|
{
|
|
struct nat44_cfg_redir *r;
|
|
struct protoent *protoent;
|
|
size_t space;
|
|
|
|
r = (struct nat44_cfg_redir *)buf;
|
|
r->mode = REDIR_PROTO;
|
|
/* Skip nat44_cfg_redir at beginning of buf. */
|
|
buf = &buf[sizeof(struct nat44_cfg_redir)];
|
|
space = sizeof(struct nat44_cfg_redir);
|
|
|
|
/*
|
|
* Extract protocol.
|
|
*/
|
|
protoent = getprotobyname(**av);
|
|
if (protoent == NULL)
|
|
errx(EX_DATAERR, "redirect_proto: unknown protocol %s", **av);
|
|
else
|
|
r->proto = protoent->p_proto;
|
|
|
|
(*av)++; (*ac)--;
|
|
|
|
/*
|
|
* Extract local address.
|
|
*/
|
|
StrToAddr(**av, &r->laddr);
|
|
|
|
(*av)++; (*ac)--;
|
|
|
|
/*
|
|
* 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 (isdigit(***av)) {
|
|
StrToAddr(**av, &r->paddr);
|
|
(*av)++; (*ac)--;
|
|
|
|
/*
|
|
* Extract optional remote address.
|
|
*/
|
|
/* see above in setup_redir_port() */
|
|
if (*ac != 0 && isdigit(***av)) {
|
|
StrToAddr(**av, &r->raddr);
|
|
(*av)++; (*ac)--;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (space);
|
|
}
|
|
|
|
static void
|
|
nat_show_log(struct nat44_cfg_nat *n, void *arg)
|
|
{
|
|
char *buf;
|
|
|
|
buf = (char *)(n + 1);
|
|
if (buf[0] != '\0')
|
|
printf("nat %s: %s\n", n->name, buf);
|
|
}
|
|
|
|
static void
|
|
nat_show_cfg(struct nat44_cfg_nat *n, void *arg)
|
|
{
|
|
int i, cnt, off;
|
|
struct nat44_cfg_redir *t;
|
|
struct nat44_cfg_spool *s;
|
|
caddr_t buf;
|
|
struct protoent *p;
|
|
|
|
buf = (caddr_t)n;
|
|
off = sizeof(*n);
|
|
printf("ipfw nat %s config", n->name);
|
|
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_SKIP_GLOBAL) {
|
|
printf(" skip_global");
|
|
n->mode &= ~PKT_ALIAS_SKIP_GLOBAL;
|
|
} 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 nat44_cfg_redir *)&buf[off];
|
|
off += sizeof(struct nat44_cfg_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 nat44_cfg_spool *)&buf[off];
|
|
if (i)
|
|
printf(",");
|
|
else
|
|
printf(" ");
|
|
printf("%s", inet_ntoa(s->addr));
|
|
off += sizeof(struct nat44_cfg_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 nat44_cfg_spool *)&buf[off];
|
|
if (i)
|
|
printf(",");
|
|
printf("%s:%u", inet_ntoa(s->addr),
|
|
s->port);
|
|
off += sizeof(struct nat44_cfg_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)
|
|
{
|
|
ipfw_obj_header *oh;
|
|
struct nat44_cfg_nat *n; /* Nat instance configuration. */
|
|
int i, off, tok, ac1;
|
|
char *id, *buf, **av1, *end;
|
|
size_t len;
|
|
|
|
av++;
|
|
ac--;
|
|
/* Nat id. */
|
|
if (ac == 0)
|
|
errx(EX_DATAERR, "missing nat id");
|
|
id = *av;
|
|
i = (int)strtol(id, &end, 0);
|
|
if (i <= 0 || *end != '\0')
|
|
errx(EX_DATAERR, "illegal nat id: %s", id);
|
|
av++;
|
|
ac--;
|
|
if (ac == 0)
|
|
errx(EX_DATAERR, "missing option");
|
|
|
|
len = sizeof(*oh) + sizeof(*n);
|
|
ac1 = ac;
|
|
av1 = av;
|
|
while (ac1 > 0) {
|
|
tok = match_token(nat_params, *av1);
|
|
ac1--;
|
|
av1++;
|
|
switch (tok) {
|
|
case TOK_IP:
|
|
case TOK_IF:
|
|
ac1--;
|
|
av1++;
|
|
break;
|
|
case TOK_ALOG:
|
|
case TOK_DENY_INC:
|
|
case TOK_SAME_PORTS:
|
|
case TOK_SKIP_GLOBAL:
|
|
case TOK_UNREG_ONLY:
|
|
case TOK_RESET_ADDR:
|
|
case TOK_ALIAS_REV:
|
|
case TOK_PROXY_ONLY:
|
|
break;
|
|
case TOK_REDIR_ADDR:
|
|
if (ac1 < 2)
|
|
errx(EX_DATAERR, "redirect_addr: "
|
|
"not enough arguments");
|
|
len += estimate_redir_addr(&ac1, &av1);
|
|
av1 += 2;
|
|
ac1 -= 2;
|
|
break;
|
|
case TOK_REDIR_PORT:
|
|
if (ac1 < 3)
|
|
errx(EX_DATAERR, "redirect_port: "
|
|
"not enough arguments");
|
|
av1++;
|
|
ac1--;
|
|
len += estimate_redir_port(&ac1, &av1);
|
|
av1 += 2;
|
|
ac1 -= 2;
|
|
/* Skip optional remoteIP/port */
|
|
if (ac1 != 0 && isdigit(**av1)) {
|
|
av1++;
|
|
ac1--;
|
|
}
|
|
break;
|
|
case TOK_REDIR_PROTO:
|
|
if (ac1 < 2)
|
|
errx(EX_DATAERR, "redirect_proto: "
|
|
"not enough arguments");
|
|
len += sizeof(struct nat44_cfg_redir);
|
|
av1 += 2;
|
|
ac1 -= 2;
|
|
/* Skip optional remoteIP/port */
|
|
if (ac1 != 0 && isdigit(**av1)) {
|
|
av1++;
|
|
ac1--;
|
|
}
|
|
if (ac1 != 0 && isdigit(**av1)) {
|
|
av1++;
|
|
ac1--;
|
|
}
|
|
break;
|
|
default:
|
|
errx(EX_DATAERR, "unrecognised option ``%s''", av1[-1]);
|
|
}
|
|
}
|
|
|
|
if ((buf = malloc(len)) == NULL)
|
|
errx(EX_OSERR, "malloc failed");
|
|
|
|
/* Offset in buf: save space for header at the beginning. */
|
|
off = sizeof(*oh) + sizeof(*n);
|
|
memset(buf, 0, len);
|
|
oh = (ipfw_obj_header *)buf;
|
|
n = (struct nat44_cfg_nat *)(oh + 1);
|
|
oh->ntlv.head.length = sizeof(oh->ntlv);
|
|
snprintf(oh->ntlv.name, sizeof(oh->ntlv.name), "%d", i);
|
|
snprintf(n->name, sizeof(n->name), "%d", i);
|
|
|
|
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_SKIP_GLOBAL:
|
|
n->mode |= PKT_ALIAS_SKIP_GLOBAL;
|
|
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], &ac, &av);
|
|
break;
|
|
case TOK_REDIR_PORT:
|
|
i = setup_redir_port(&buf[off], &ac, &av);
|
|
break;
|
|
case TOK_REDIR_PROTO:
|
|
i = setup_redir_proto(&buf[off], &ac, &av);
|
|
break;
|
|
}
|
|
n->redir_cnt++;
|
|
off += i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
i = do_set3(IP_FW_NAT44_XCONFIG, &oh->opheader, len);
|
|
if (i != 0)
|
|
err(1, "setsockopt(%s)", "IP_FW_NAT44_XCONFIG");
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
struct nat_list_arg {
|
|
uint16_t cmd;
|
|
int is_all;
|
|
};
|
|
|
|
static int
|
|
nat_show_data(struct nat44_cfg_nat *cfg, void *arg)
|
|
{
|
|
struct nat_list_arg *nla;
|
|
ipfw_obj_header *oh;
|
|
|
|
nla = (struct nat_list_arg *)arg;
|
|
|
|
switch (nla->cmd) {
|
|
case IP_FW_NAT44_XGETCONFIG:
|
|
if (nat_get_cmd(cfg->name, nla->cmd, &oh) != 0) {
|
|
warnx("Error getting nat instance %s info", cfg->name);
|
|
break;
|
|
}
|
|
nat_show_cfg((struct nat44_cfg_nat *)(oh + 1), NULL);
|
|
free(oh);
|
|
break;
|
|
case IP_FW_NAT44_XGETLOG:
|
|
if (nat_get_cmd(cfg->name, nla->cmd, &oh) == 0) {
|
|
nat_show_log((struct nat44_cfg_nat *)(oh + 1), NULL);
|
|
free(oh);
|
|
break;
|
|
}
|
|
/* Handle error */
|
|
if (nla->is_all != 0 && errno == ENOENT)
|
|
break;
|
|
warn("Error getting nat instance %s info", cfg->name);
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Compare nat names.
|
|
* Honor number comparison.
|
|
*/
|
|
static int
|
|
natname_cmp(const void *a, const void *b)
|
|
{
|
|
struct nat44_cfg_nat *ia, *ib;
|
|
|
|
ia = (struct nat44_cfg_nat *)a;
|
|
ib = (struct nat44_cfg_nat *)b;
|
|
|
|
return (stringnum_cmp(ia->name, ib->name));
|
|
}
|
|
|
|
/*
|
|
* Retrieves nat list from kernel,
|
|
* optionally sorts it and calls requested function for each table.
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
nat_foreach(nat_cb_t *f, void *arg, int sort)
|
|
{
|
|
ipfw_obj_lheader *olh;
|
|
struct nat44_cfg_nat *cfg;
|
|
size_t sz;
|
|
int i, error;
|
|
|
|
/* Start with reasonable default */
|
|
sz = sizeof(*olh) + 16 * sizeof(struct nat44_cfg_nat);
|
|
|
|
for (;;) {
|
|
if ((olh = calloc(1, sz)) == NULL)
|
|
return (ENOMEM);
|
|
|
|
olh->size = sz;
|
|
if (do_get3(IP_FW_NAT44_LIST_NAT, &olh->opheader, &sz) != 0) {
|
|
sz = olh->size;
|
|
free(olh);
|
|
if (errno == ENOMEM)
|
|
continue;
|
|
return (errno);
|
|
}
|
|
|
|
if (sort != 0)
|
|
qsort(olh + 1, olh->count, olh->objsize, natname_cmp);
|
|
|
|
cfg = (struct nat44_cfg_nat*)(olh + 1);
|
|
for (i = 0; i < olh->count; i++) {
|
|
error = f(cfg, arg); /* Ignore errors for now */
|
|
cfg = (struct nat44_cfg_nat *)((caddr_t)cfg +
|
|
olh->objsize);
|
|
}
|
|
|
|
free(olh);
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
nat_get_cmd(char *name, uint16_t cmd, ipfw_obj_header **ooh)
|
|
{
|
|
ipfw_obj_header *oh;
|
|
struct nat44_cfg_nat *cfg;
|
|
size_t sz;
|
|
|
|
/* Start with reasonable default */
|
|
sz = sizeof(*oh) + sizeof(*cfg) + 128;
|
|
|
|
for (;;) {
|
|
if ((oh = calloc(1, sz)) == NULL)
|
|
return (ENOMEM);
|
|
cfg = (struct nat44_cfg_nat *)(oh + 1);
|
|
oh->ntlv.head.length = sizeof(oh->ntlv);
|
|
strlcpy(oh->ntlv.name, name, sizeof(oh->ntlv.name));
|
|
strlcpy(cfg->name, name, sizeof(cfg->name));
|
|
|
|
if (do_get3(cmd, &oh->opheader, &sz) != 0) {
|
|
sz = cfg->size;
|
|
free(oh);
|
|
if (errno == ENOMEM)
|
|
continue;
|
|
return (errno);
|
|
}
|
|
|
|
*ooh = oh;
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
ipfw_show_nat(int ac, char **av)
|
|
{
|
|
ipfw_obj_header *oh;
|
|
char *name;
|
|
int cmd;
|
|
struct nat_list_arg nla;
|
|
|
|
ac--;
|
|
av++;
|
|
|
|
if (co.test_only)
|
|
return;
|
|
|
|
/* Parse parameters. */
|
|
cmd = 0; /* XXX: Change to IP_FW_NAT44_XGETLOG @ MFC */
|
|
name = NULL;
|
|
for ( ; ac != 0; ac--, av++) {
|
|
if (!strncmp(av[0], "config", strlen(av[0]))) {
|
|
cmd = IP_FW_NAT44_XGETCONFIG;
|
|
continue;
|
|
}
|
|
if (strcmp(av[0], "log") == 0) {
|
|
cmd = IP_FW_NAT44_XGETLOG;
|
|
continue;
|
|
}
|
|
if (name != NULL)
|
|
err(EX_USAGE,"only one instance name may be specified");
|
|
name = av[0];
|
|
}
|
|
|
|
if (cmd == 0)
|
|
errx(EX_USAGE, "Please specify action. Available: config,log");
|
|
|
|
if (name == NULL) {
|
|
memset(&nla, 0, sizeof(nla));
|
|
nla.cmd = cmd;
|
|
nla.is_all = 1;
|
|
nat_foreach(nat_show_data, &nla, 1);
|
|
} else {
|
|
if (nat_get_cmd(name, cmd, &oh) != 0)
|
|
err(EX_OSERR, "Error getting nat %s instance info", name);
|
|
nat_show_cfg((struct nat44_cfg_nat *)(oh + 1), NULL);
|
|
free(oh);
|
|
}
|
|
}
|
|
|