731 lines
15 KiB
C
731 lines
15 KiB
C
/* $NetBSD: natparse.c,v 1.2 2004/11/13 19:16:10 he Exp $ */
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/*
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* Copyright (C) 1993-2001 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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#if !defined(lint)
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static const char sccsid[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
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static const char rcsid[] = "@(#)Id: natparse.c,v 1.8 2003/12/01 02:03:32 darrenr Exp";
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#endif
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <ctype.h>
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#include "ipf.h"
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#include "opts.h"
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void nat_setgroupmap(n)
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ipnat_t *n;
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{
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if (n->in_outmsk == n->in_inmsk)
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n->in_ippip = 1;
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else if (n->in_flags & IPN_AUTOPORTMAP) {
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n->in_ippip = ~ntohl(n->in_inmsk);
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if (n->in_outmsk != 0xffffffff)
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n->in_ippip /= (~ntohl(n->in_outmsk) + 1);
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n->in_ippip++;
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if (n->in_ippip == 0)
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n->in_ippip = 1;
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n->in_ppip = USABLE_PORTS / n->in_ippip;
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} else {
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n->in_space = USABLE_PORTS * ~ntohl(n->in_outmsk);
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n->in_nip = 0;
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if (!(n->in_ppip = n->in_pmin))
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n->in_ppip = 1;
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n->in_ippip = USABLE_PORTS / n->in_ppip;
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}
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}
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ipnat_t *natparse(line, linenum)
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char *line;
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int linenum;
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{
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static ipnat_t ipn;
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struct protoent *pr;
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char *dnetm = NULL, *dport = NULL, *proto = NULL;
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char *s, *t, *cps[31], **cpp;
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int i, cnt;
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if ((s = strchr(line, '\n')))
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*s = '\0';
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if ((s = strchr(line, '#')))
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*s = '\0';
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while (*line && ISSPACE(*line))
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line++;
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if (!*line)
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return NULL;
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bzero((char *)&ipn, sizeof(ipn));
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cnt = 0;
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for (i = 0, *cps = strtok(line, " \b\t\r\n"); cps[i] && i < 30; cnt++)
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cps[++i] = strtok(NULL, " \b\t\r\n");
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cps[i] = NULL;
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if (cnt < 3) {
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fprintf(stderr, "%d: not enough segments in line\n", linenum);
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return NULL;
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}
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cpp = cps;
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if (!strcasecmp(*cpp, "map"))
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ipn.in_redir = NAT_MAP;
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else if (!strcasecmp(*cpp, "map-block"))
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ipn.in_redir = NAT_MAPBLK;
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else if (!strcasecmp(*cpp, "rdr"))
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ipn.in_redir = NAT_REDIRECT;
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else if (!strcasecmp(*cpp, "bimap"))
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ipn.in_redir = NAT_BIMAP;
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else {
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fprintf(stderr, "%d: unknown mapping: \"%s\"\n",
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linenum, *cpp);
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return NULL;
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}
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cpp++;
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strncpy(ipn.in_ifnames[0], *cpp, sizeof(ipn.in_ifnames[0]) - 1);
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ipn.in_ifnames[0][sizeof(ipn.in_ifnames[0]) - 1] = '\0';
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cpp++;
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if (!strcasecmp(*cpp, "from") || (**cpp == '!')) {
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if (!strcmp(*cpp, "!")) {
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cpp++;
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if (strcasecmp(*cpp, "from")) {
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fprintf(stderr, "Missing from after !\n");
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return NULL;
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}
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ipn.in_flags |= IPN_NOTSRC;
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} else if (**cpp == '!') {
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if (strcasecmp(*cpp + 1, "from")) {
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fprintf(stderr, "Missing from after !\n");
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return NULL;
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}
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ipn.in_flags |= IPN_NOTSRC;
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}
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if ((ipn.in_flags & IPN_NOTSRC) &&
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(ipn.in_redir & (NAT_MAP|NAT_MAPBLK))) {
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fprintf(stderr, "Cannot use '! from' with map\n");
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return NULL;
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}
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ipn.in_flags |= IPN_FILTER;
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cpp++;
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if (ipn.in_redir == NAT_REDIRECT) {
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if (hostmask(&cpp, proto, NULL,
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(u_32_t *)&ipn.in_srcip,
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(u_32_t *)&ipn.in_srcmsk, linenum) == -1)
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return NULL;
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if (ports(&cpp, proto, &ipn.in_sport,
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&ipn.in_scmp, &ipn.in_stop, linenum))
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return NULL;
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} else {
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if (hostmask(&cpp, proto, NULL,
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(u_32_t *)&ipn.in_inip,
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(u_32_t *)&ipn.in_inmsk, linenum) == -1)
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return NULL;
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if (ports(&cpp, proto, &ipn.in_dport,
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&ipn.in_dcmp, &ipn.in_dtop, linenum))
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return NULL;
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}
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if (!strcmp(*cpp, "!")) {
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cpp++;
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ipn.in_flags |= IPN_NOTDST;
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} else if (**cpp == '!') {
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(*cpp)++;
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ipn.in_flags |= IPN_NOTDST;
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}
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if (strcasecmp(*cpp, "to")) {
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fprintf(stderr, "%d: unexpected keyword (%s) - to\n",
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linenum, *cpp);
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return NULL;
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}
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if ((ipn.in_flags & IPN_NOTDST) &&
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(ipn.in_redir & (NAT_REDIRECT))) {
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fprintf(stderr, "Cannot use '! to' with rdr\n");
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return NULL;
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}
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if (!*++cpp) {
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fprintf(stderr, "%d: missing host after to\n", linenum);
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return NULL;
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}
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if (ipn.in_redir == NAT_REDIRECT) {
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if (hostmask(&cpp, proto, NULL,
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(u_32_t *)&ipn.in_outip,
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(u_32_t *)&ipn.in_outmsk, linenum))
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return NULL;
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if (ports(&cpp, proto, &ipn.in_dport,
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&ipn.in_dcmp, &ipn.in_dtop, linenum))
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return NULL;
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ipn.in_pmin = htons(ipn.in_dport);
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} else {
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if (hostmask(&cpp, proto, NULL,
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(u_32_t *)&ipn.in_srcip,
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(u_32_t *)&ipn.in_srcmsk, linenum))
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return NULL;
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if (ports(&cpp, proto, &ipn.in_sport,
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&ipn.in_scmp, &ipn.in_stop, linenum))
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return NULL;
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}
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} else {
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s = *cpp;
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if (!s)
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return NULL;
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t = strchr(s, '/');
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if (!t)
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return NULL;
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*t++ = '\0';
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if (ipn.in_redir == NAT_REDIRECT) {
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if (hostnum((u_32_t *)&ipn.in_outip, s, linenum, NULL))
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return NULL;
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if (genmask(t, (u_32_t *)&ipn.in_outmsk) == -1) {
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return NULL;
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}
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} else {
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if (hostnum((u_32_t *)&ipn.in_inip, s, linenum, NULL))
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return NULL;
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if (genmask(t, (u_32_t *)&ipn.in_inmsk) == -1) {
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return NULL;
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}
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}
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cpp++;
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if (!*cpp)
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return NULL;
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}
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if ((ipn.in_redir == NAT_REDIRECT) && !(ipn.in_flags & IPN_FILTER)) {
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if (strcasecmp(*cpp, "port")) {
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fprintf(stderr, "%d: missing fields - 1st port\n",
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linenum);
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return NULL;
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}
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cpp++;
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if (!*cpp) {
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fprintf(stderr,
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"%d: missing fields (destination port)\n",
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linenum);
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return NULL;
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}
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if (ISDIGIT(**cpp) && (s = strchr(*cpp, '-')))
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*s++ = '\0';
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else
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s = NULL;
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if (!portnum(*cpp, proto, &ipn.in_pmin, linenum))
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return NULL;
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ipn.in_pmin = htons(ipn.in_pmin);
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cpp++;
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if (!strcmp(*cpp, "-")) {
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cpp++;
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s = *cpp++;
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}
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if (s) {
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if (!portnum(s, proto, &ipn.in_pmax, linenum))
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return NULL;
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ipn.in_pmax = htons(ipn.in_pmax);
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} else
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ipn.in_pmax = ipn.in_pmin;
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}
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if (!*cpp) {
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fprintf(stderr, "%d: missing fields (->)\n", linenum);
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return NULL;
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}
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if (strcmp(*cpp, "->")) {
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fprintf(stderr, "%d: missing ->\n", linenum);
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return NULL;
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}
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cpp++;
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if (!*cpp) {
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fprintf(stderr, "%d: missing fields (%s)\n",
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linenum, ipn.in_redir ? "destination" : "target");
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return NULL;
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}
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if (ipn.in_redir == NAT_MAP) {
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if (!strcasecmp(*cpp, "range")) {
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cpp++;
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ipn.in_flags |= IPN_IPRANGE;
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if (!*cpp) {
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fprintf(stderr, "%d: missing fields (%s)\n",
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linenum,
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ipn.in_redir ? "destination":"target");
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return NULL;
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}
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}
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}
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if (ipn.in_flags & IPN_IPRANGE) {
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dnetm = strrchr(*cpp, '-');
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if (dnetm == NULL) {
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cpp++;
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if (*cpp && !strcmp(*cpp, "-") && *(cpp + 1))
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dnetm = *(cpp + 1);
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} else
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*dnetm++ = '\0';
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if (dnetm == NULL || *dnetm == '\0') {
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fprintf(stderr,
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"%d: desination range not specified\n",
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linenum);
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return NULL;
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}
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} else if (ipn.in_redir != NAT_REDIRECT) {
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dnetm = strrchr(*cpp, '/');
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if (dnetm == NULL) {
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cpp++;
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if (*cpp && !strcasecmp(*cpp, "netmask"))
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dnetm = *++cpp;
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}
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if (dnetm == NULL) {
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fprintf(stderr,
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"%d: missing fields (dest netmask)\n",
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linenum);
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return NULL;
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}
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if (*dnetm == '/')
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*dnetm++ = '\0';
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}
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if (ipn.in_redir == NAT_REDIRECT) {
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dnetm = strchr(*cpp, ',');
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if (dnetm != NULL) {
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ipn.in_flags |= IPN_SPLIT;
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*dnetm++ = '\0';
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}
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if (hostnum((u_32_t *)&ipn.in_inip, *cpp, linenum, NULL))
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return NULL;
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} else {
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if (hostnum((u_32_t *)&ipn.in_outip, *cpp, linenum, NULL))
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return NULL;
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}
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cpp++;
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if (ipn.in_redir & NAT_MAPBLK) {
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if (*cpp && strcasecmp(*cpp, "ports")) {
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fprintf(stderr,
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"%d: expected \"ports\" - got \"%s\"\n",
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linenum, *cpp);
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return NULL;
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}
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cpp++;
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if (*cpp) {
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ipn.in_pmin = atoi(*cpp);
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cpp++;
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} else
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ipn.in_pmin = 0;
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} else if ((ipn.in_redir & NAT_BIMAP) == NAT_REDIRECT) {
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if (*cpp && strrchr(*cpp, '/') != NULL) {
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fprintf(stderr, "%d: No netmask supported in %s\n",
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linenum, "destination host for redirect");
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return NULL;
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}
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/* If it's a in_redir, expect target port */
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if (!*cpp || strcasecmp(*cpp, "port")) {
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fprintf(stderr, "%d: missing fields - 2nd port (%s)\n",
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linenum, *cpp);
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return NULL;
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}
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cpp++;
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if (!*cpp) {
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fprintf(stderr,
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"%d: missing fields (destination port)\n",
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linenum);
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return NULL;
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}
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if (!portnum(*cpp, proto, &ipn.in_pnext, linenum))
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return NULL;
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ipn.in_pnext = htons(ipn.in_pnext);
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cpp++;
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}
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if (dnetm && *dnetm == '/')
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*dnetm++ = '\0';
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if (ipn.in_redir & (NAT_MAP|NAT_MAPBLK)) {
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if (ipn.in_flags & IPN_IPRANGE) {
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if (hostnum((u_32_t *)&ipn.in_outmsk, dnetm,
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linenum, NULL) == -1)
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return NULL;
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} else if (genmask(dnetm, (u_32_t *)&ipn.in_outmsk))
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return NULL;
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} else {
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if (ipn.in_flags & IPN_SPLIT) {
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if (hostnum((u_32_t *)&ipn.in_inmsk, dnetm,
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linenum, NULL) == -1)
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return NULL;
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} else if (genmask("255.255.255.255", (u_32_t *)&ipn.in_inmsk))
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return NULL;
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if (!*cpp) {
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ipn.in_flags |= IPN_TCP; /* XXX- TCP only by default */
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proto = "tcp";
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} else {
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if (!strcasecmp(*cpp, "tcp"))
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ipn.in_flags |= IPN_TCP;
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else if (!strcasecmp(*cpp, "udp"))
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ipn.in_flags |= IPN_UDP;
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else if (!strcasecmp(*cpp, "tcp/udp"))
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ipn.in_flags |= IPN_TCPUDP;
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else if (!strcasecmp(*cpp, "tcpudp"))
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ipn.in_flags |= IPN_TCPUDP;
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else if (!strcasecmp(*cpp, "ip"))
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ipn.in_flags |= IPN_ANY;
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else {
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ipn.in_flags |= IPN_ANY;
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ipn.in_p = getproto(*cpp);
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}
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proto = *cpp;
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cpp++;
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if (*cpp && !strcasecmp(*cpp, "round-robin")) {
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cpp++;
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ipn.in_flags |= IPN_ROUNDR;
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}
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if (*cpp && !strcasecmp(*cpp, "frag")) {
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cpp++;
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ipn.in_flags |= IPN_FRAG;
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}
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if (*cpp && !strcasecmp(*cpp, "age")) {
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cpp++;
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if (!*cpp) {
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fprintf(stderr,
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"%d: age with no parameters\n",
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linenum);
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return NULL;
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}
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ipn.in_age[0] = atoi(*cpp);
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s = strchr(*cpp, '/');
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if (s != NULL)
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ipn.in_age[1] = atoi(s + 1);
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else
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ipn.in_age[1] = ipn.in_age[0];
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cpp++;
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}
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if (*cpp && !strcasecmp(*cpp, "mssclamp")) {
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cpp++;
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if (*cpp) {
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ipn.in_mssclamp = atoi(*cpp);
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cpp++;
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} else {
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fprintf(stderr,
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"%d: mssclamp with no parameters\n",
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linenum);
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return NULL;
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}
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}
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if (*cpp) {
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fprintf(stderr,
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"%d: extra junk at the end of rdr: %s\n",
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linenum, *cpp);
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return NULL;
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}
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}
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}
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if (!(ipn.in_flags & IPN_SPLIT))
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ipn.in_inip &= ipn.in_inmsk;
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if ((ipn.in_flags & IPN_IPRANGE) == 0)
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ipn.in_outip &= ipn.in_outmsk;
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ipn.in_srcip &= ipn.in_srcmsk;
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if ((ipn.in_redir & NAT_MAPBLK) != 0)
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nat_setgroupmap(&ipn);
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if (*cpp && !strcasecmp(*cpp, "frag")) {
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cpp++;
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ipn.in_flags |= IPN_ROUNDR;
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}
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if (!*cpp)
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return &ipn;
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if (ipn.in_redir != NAT_BIMAP && !strcasecmp(*cpp, "proxy")) {
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if (ipn.in_redir == NAT_BIMAP) {
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fprintf(stderr, "%d: cannot use proxy with bimap\n",
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linenum);
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return NULL;
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}
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cpp++;
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if (!*cpp) {
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fprintf(stderr,
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"%d: missing parameter for \"proxy\"\n",
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linenum);
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return NULL;
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}
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dport = NULL;
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|
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if (!strcasecmp(*cpp, "port")) {
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cpp++;
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if (!*cpp) {
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fprintf(stderr,
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"%d: missing parameter for \"port\"\n",
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linenum);
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return NULL;
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}
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dport = *cpp;
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cpp++;
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|
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if (!*cpp) {
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fprintf(stderr,
|
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"%d: missing parameter for \"proxy\"\n",
|
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linenum);
|
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return NULL;
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}
|
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} else {
|
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fprintf(stderr,
|
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"%d: missing keyword \"port\"\n", linenum);
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return NULL;
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}
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|
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if ((proto = strchr(*cpp, '/'))) {
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*proto++ = '\0';
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ipn.in_p = getproto(proto);
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} else
|
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ipn.in_p = 0;
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|
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if (dport && !portnum(dport, proto, &ipn.in_dport, linenum))
|
|
return NULL;
|
|
ipn.in_dport = htons(ipn.in_dport);
|
|
|
|
(void) strncpy(ipn.in_plabel, *cpp, sizeof(ipn.in_plabel));
|
|
cpp++;
|
|
|
|
if (*cpp) {
|
|
fprintf(stderr,
|
|
"%d: too many parameters for \"proxy\"\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
return &ipn;
|
|
}
|
|
|
|
|
|
if (!strcasecmp(*cpp, "icmpidmap")) {
|
|
|
|
cpp++;
|
|
if (!*cpp) {
|
|
fprintf(stderr,
|
|
"%d: icmpidmap misses protocol and range\n",
|
|
linenum);
|
|
return NULL;
|
|
};
|
|
|
|
if (!strcasecmp(*cpp, "icmp"))
|
|
ipn.in_flags = IPN_ICMPQUERY;
|
|
else {
|
|
fprintf(stderr, "%d: icmpidmap only valid for icmp\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
cpp++;
|
|
|
|
if (!*cpp) {
|
|
fprintf(stderr, "%d: no icmp id argument found\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
|
|
if (!(t = strchr(*cpp, ':'))) {
|
|
fprintf(stderr,
|
|
"%d: no icmp id range detected in \"%s\"\n",
|
|
linenum, *cpp);
|
|
return NULL;
|
|
}
|
|
*t++ = '\0';
|
|
|
|
if (!icmpidnum(*cpp, &ipn.in_pmin, linenum) ||
|
|
!icmpidnum(t, &ipn.in_pmax, linenum))
|
|
return NULL;
|
|
} else if (!strcasecmp(*cpp, "portmap")) {
|
|
if (ipn.in_redir == NAT_BIMAP) {
|
|
fprintf(stderr, "%d: cannot use proxy with bimap\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
cpp++;
|
|
if (!*cpp) {
|
|
fprintf(stderr,
|
|
"%d: missing expression following portmap\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
|
|
if (!strcasecmp(*cpp, "tcp"))
|
|
ipn.in_flags |= IPN_TCP;
|
|
else if (!strcasecmp(*cpp, "udp"))
|
|
ipn.in_flags |= IPN_UDP;
|
|
else if (!strcasecmp(*cpp, "tcpudp"))
|
|
ipn.in_flags |= IPN_TCPUDP;
|
|
else if (!strcasecmp(*cpp, "tcp/udp"))
|
|
ipn.in_flags |= IPN_TCPUDP;
|
|
else {
|
|
fprintf(stderr,
|
|
"%d: expected protocol name - got \"%s\"\n",
|
|
linenum, *cpp);
|
|
return NULL;
|
|
}
|
|
proto = *cpp;
|
|
cpp++;
|
|
|
|
if (!*cpp) {
|
|
fprintf(stderr, "%d: no port range found\n", linenum);
|
|
return NULL;
|
|
}
|
|
|
|
if (!strcasecmp(*cpp, "auto")) {
|
|
ipn.in_flags |= IPN_AUTOPORTMAP;
|
|
ipn.in_pmin = htons(1024);
|
|
ipn.in_pmax = htons(65535);
|
|
nat_setgroupmap(&ipn);
|
|
} else {
|
|
if (!(t = strchr(*cpp, ':'))) {
|
|
fprintf(stderr,
|
|
"%d: no port range in \"%s\"\n",
|
|
linenum, *cpp);
|
|
return NULL;
|
|
}
|
|
*t++ = '\0';
|
|
if (!portnum(*cpp, proto, &ipn.in_pmin, linenum) ||
|
|
!portnum(t, proto, &ipn.in_pmax, linenum))
|
|
return NULL;
|
|
}
|
|
cpp++;
|
|
}
|
|
|
|
if (*cpp && !strcasecmp(*cpp, "round-robin")) {
|
|
cpp++;
|
|
ipn.in_flags |= IPN_ROUNDR;
|
|
}
|
|
|
|
if (*cpp && !strcasecmp(*cpp, "age")) {
|
|
cpp++;
|
|
if (!*cpp) {
|
|
fprintf(stderr, "%d: age with no parameters\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
s = strchr(*cpp, '/');
|
|
if (s != NULL)
|
|
ipn.in_age[1] = atoi(s + 1);
|
|
else
|
|
ipn.in_age[1] = ipn.in_age[0];
|
|
cpp++;
|
|
}
|
|
|
|
if (*cpp && !strcasecmp(*cpp, "mssclamp")) {
|
|
cpp++;
|
|
if (*cpp) {
|
|
ipn.in_mssclamp = atoi(*cpp);
|
|
cpp++;
|
|
} else {
|
|
fprintf(stderr, "%d: mssclamp with no parameters\n",
|
|
linenum);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (*cpp) {
|
|
fprintf(stderr, "%d: extra junk at the end of the line: %s\n",
|
|
linenum, *cpp);
|
|
return NULL;
|
|
}
|
|
|
|
ipn.in_pmin = htons(ipn.in_pmin);
|
|
ipn.in_pmax = htons(ipn.in_pmax);
|
|
return &ipn;
|
|
}
|
|
|
|
|
|
void natparsefile(fd, file, opts)
|
|
int fd;
|
|
char *file;
|
|
int opts;
|
|
{
|
|
char line[512], *s;
|
|
ipnat_t *np;
|
|
FILE *fp;
|
|
int linenum = 0;
|
|
|
|
if (strcmp(file, "-")) {
|
|
if (!(fp = fopen(file, "r"))) {
|
|
fprintf(stderr, "%s: open: %s\n", file,
|
|
STRERROR(errno));
|
|
exit(1);
|
|
}
|
|
} else
|
|
fp = stdin;
|
|
|
|
while (getline(line, sizeof(line) - 1, fp, &linenum)) {
|
|
line[sizeof(line) - 1] = '\0';
|
|
if ((s = strchr(line, '\n')))
|
|
*s = '\0';
|
|
|
|
if (!(np = natparse(line, linenum))) {
|
|
if (*line)
|
|
fprintf(stderr, "%d: syntax error in \"%s\"\n",
|
|
linenum, line);
|
|
} else {
|
|
if ((opts & OPT_VERBOSE) && np)
|
|
printnat(np, opts);
|
|
if (!(opts & OPT_DONOTHING)) {
|
|
if (!(opts & OPT_REMOVE)) {
|
|
if (ioctl(fd, SIOCADNAT, &np) == -1)
|
|
perror("ioctl(SIOCADNAT)");
|
|
} else if (ioctl(fd, SIOCRMNAT, &np) == -1)
|
|
perror("ioctl(SIOCRMNAT)");
|
|
}
|
|
}
|
|
}
|
|
if (fp != stdin)
|
|
fclose(fp);
|
|
}
|
|
|
|
|
|
int icmpidnum(str, id, linenum)
|
|
char *str;
|
|
u_short *id;
|
|
int linenum;
|
|
{
|
|
int i;
|
|
|
|
|
|
i = atoi(str);
|
|
|
|
if ((i<0) || (i>65535)) {
|
|
fprintf(stderr, "%d: invalid icmp id\"%s\".\n", linenum, str);
|
|
return 0;
|
|
}
|
|
|
|
*id = (u_short)i;
|
|
|
|
return 1;
|
|
}
|