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freebsd-skq/contrib/ipfilter/parse.c
darrenr 3aab5fb9fd With a bit of luck, this will be a first-time right import of ipfilter 3.4.29 
on to the vendor branch.
2002-08-28 13:42:48 +00:00

1428 lines
31 KiB
C
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/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#ifdef __sgi
# include <sys/ptimers.h>
#endif
#include <sys/types.h>
#if !defined(__SVR4) && !defined(__svr4__)
#include <strings.h>
#else
#include <sys/byteorder.h>
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <net/if.h>
#if __FreeBSD_version >= 300000
# include <net/if_var.h>
#endif
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <netdb.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <resolv.h>
#include <ctype.h>
#include <syslog.h>
#include "ip_compat.h"
#include "ip_fil.h"
#include "ipf.h"
#include "facpri.h"
#if !defined(lint)
static const char sccsid[] = "@(#)parse.c 1.44 6/5/96 (C) 1993-2000 Darren Reed";
static const char rcsid[] = "@(#)$IPFilter: parse.c,v 2.8 1999/12/28 10:49:46 darrenr Exp $";
#endif
extern struct ipopt_names ionames[], secclass[];
extern int opts;
extern int use_inet6;
int addicmp __P((char ***, struct frentry *, int));
int extras __P((char ***, struct frentry *, int));
int icmpcode __P((char *)), addkeep __P((char ***, struct frentry *, int));
int to_interface __P((frdest_t *, char *, int));
void print_toif __P((char *, frdest_t *));
void optprint __P((u_short *, u_long, u_long));
int loglevel __P((char **, u_int *, int));
void printlog __P((frentry_t *));
void printifname __P((char *, char *, void *));
extern char *proto;
extern char flagset[];
extern u_char flags[];
/* parse()
*
* parse a line read from the input filter rule file
*/
struct frentry *parse(line, linenum)
char *line;
int linenum;
{
static struct frentry fil;
char *cps[31], **cpp, *endptr, *s;
struct protoent *p = NULL;
int i, cnt = 1, j, ch;
u_int k;
while (*line && isspace(*line))
line++;
if (!*line)
return NULL;
bzero((char *)&fil, sizeof(fil));
fil.fr_mip.fi_v = 0xf;
fil.fr_ip.fi_v = use_inet6 ? 6 : 4;
fil.fr_loglevel = 0xffff;
/*
* break line up into max of 20 segments
*/
if (opts & OPT_DEBUG)
fprintf(stderr, "parse [%s]\n", line);
for (i = 0, *cps = strtok(line, " \b\t\r\n"); cps[i] && i < 30; cnt++)
cps[++i] = strtok(NULL, " \b\t\r\n");
cps[i] = NULL;
if (cnt < 3) {
fprintf(stderr, "%d: not enough segments in line\n", linenum);
return NULL;
}
cpp = cps;
/*
* The presence of an '@' followed by a number gives the position in
* the current rule list to insert this one.
*/
if (**cpp == '@')
fil.fr_hits = (U_QUAD_T)atoi(*cpp++ + 1) + 1;
/*
* Check the first keyword in the rule and any options that are
* expected to follow it.
*/
if (!strcasecmp("block", *cpp)) {
fil.fr_flags |= FR_BLOCK;
if (!strncasecmp(*(cpp+1), "return-icmp-as-dest", 19) &&
(i = 19))
fil.fr_flags |= FR_FAKEICMP;
else if (!strncasecmp(*(cpp+1), "return-icmp", 11) && (i = 11))
fil.fr_flags |= FR_RETICMP;
if (fil.fr_flags & FR_RETICMP) {
cpp++;
if (strlen(*cpp) == i) {
if (*(cpp + 1) && **(cpp +1) == '(') {
cpp++;
i = 0;
} else
i = -1;
}
/*
* The ICMP code is not required to follow in ()'s
*/
if ((i >= 0) && (*(*cpp + i) == '(')) {
i++;
j = icmpcode(*cpp + i);
if (j == -1) {
fprintf(stderr,
"%d: unrecognised icmp code %s\n",
linenum, *cpp + 20);
return NULL;
}
fil.fr_icode = j;
}
} else if (!strcasecmp(*(cpp+1), "return-rst")) {
fil.fr_flags |= FR_RETRST;
cpp++;
}
} else if (!strcasecmp("count", *cpp)) {
fil.fr_flags |= FR_ACCOUNT;
} else if (!strcasecmp("pass", *cpp)) {
fil.fr_flags |= FR_PASS;
} else if (!strcasecmp("nomatch", *cpp)) {
fil.fr_flags |= FR_NOMATCH;
} else if (!strcasecmp("auth", *cpp)) {
fil.fr_flags |= FR_AUTH;
} else if (!strcasecmp("preauth", *cpp)) {
fil.fr_flags |= FR_PREAUTH;
} else if (!strcasecmp("skip", *cpp)) {
cpp++;
if (ratoui(*cpp, &k, 0, UINT_MAX))
fil.fr_skip = k;
else {
fprintf(stderr, "%d: integer must follow skip\n",
linenum);
return NULL;
}
} else if (!strcasecmp("log", *cpp)) {
fil.fr_flags |= FR_LOG;
if (!strcasecmp(*(cpp+1), "body")) {
fil.fr_flags |= FR_LOGBODY;
cpp++;
}
if (!strcasecmp(*(cpp+1), "first")) {
fil.fr_flags |= FR_LOGFIRST;
cpp++;
}
if (*cpp && !strcasecmp(*(cpp+1), "or-block")) {
fil.fr_flags |= FR_LOGORBLOCK;
cpp++;
}
if (!strcasecmp(*(cpp+1), "level")) {
cpp++;
if (loglevel(cpp, &fil.fr_loglevel, linenum) == -1)
return NULL;
cpp++;
}
} else {
/*
* Doesn't start with one of the action words
*/
fprintf(stderr, "%d: unknown keyword (%s)\n", linenum, *cpp);
return NULL;
}
if (!*++cpp) {
fprintf(stderr, "%d: missing 'in'/'out' keyword\n", linenum);
return NULL;
}
/*
* Get the direction for filtering. Impose restrictions on direction
* if blocking with returning ICMP or an RST has been requested.
*/
if (!strcasecmp("in", *cpp))
fil.fr_flags |= FR_INQUE;
else if (!strcasecmp("out", *cpp)) {
fil.fr_flags |= FR_OUTQUE;
if (fil.fr_flags & FR_RETICMP) {
fprintf(stderr,
"%d: Can only use return-icmp with 'in'\n",
linenum);
return NULL;
} else if (fil.fr_flags & FR_RETRST) {
fprintf(stderr,
"%d: Can only use return-rst with 'in'\n",
linenum);
return NULL;
}
}
if (!*++cpp) {
fprintf(stderr, "%d: missing source specification\n", linenum);
return NULL;
}
if (!strcasecmp("log", *cpp)) {
if (!*++cpp) {
fprintf(stderr, "%d: missing source specification\n",
linenum);
return NULL;
}
if (fil.fr_flags & FR_PASS)
fil.fr_flags |= FR_LOGP;
else if (fil.fr_flags & FR_BLOCK)
fil.fr_flags |= FR_LOGB;
if (*cpp && !strcasecmp(*cpp, "body")) {
fil.fr_flags |= FR_LOGBODY;
cpp++;
}
if (*cpp && !strcasecmp(*cpp, "first")) {
fil.fr_flags |= FR_LOGFIRST;
cpp++;
}
if (*cpp && !strcasecmp(*cpp, "or-block")) {
if (!(fil.fr_flags & FR_PASS)) {
fprintf(stderr,
"%d: or-block must be used with pass\n",
linenum);
return NULL;
}
fil.fr_flags |= FR_LOGORBLOCK;
cpp++;
}
if (*cpp && !strcasecmp(*cpp, "level")) {
if (loglevel(cpp, &fil.fr_loglevel, linenum) == -1)
return NULL;
cpp++;
cpp++;
}
}
if (*cpp && !strcasecmp("quick", *cpp)) {
if (fil.fr_skip != 0) {
fprintf(stderr, "%d: cannot use skip with quick\n",
linenum);
return NULL;
}
cpp++;
fil.fr_flags |= FR_QUICK;
}
/*
* Parse rule options that are available if a rule is tied to an
* interface.
*/
*fil.fr_ifname = '\0';
*fil.fr_oifname = '\0';
if (*cpp && !strcasecmp(*cpp, "on")) {
if (!*++cpp) {
fprintf(stderr, "%d: interface name missing\n",
linenum);
return NULL;
}
s = index(*cpp, ',');
if (s != NULL) {
*s++ = '\0';
(void)strncpy(fil.fr_ifnames[1], s, IFNAMSIZ - 1);
fil.fr_ifnames[1][IFNAMSIZ - 1] = '\0';
} else
strcpy(fil.fr_ifnames[1], "*");
(void)strncpy(fil.fr_ifnames[0], *cpp, IFNAMSIZ - 1);
fil.fr_ifnames[0][IFNAMSIZ - 1] = '\0';
cpp++;
if (!*cpp) {
if ((fil.fr_flags & FR_RETMASK) == FR_RETRST) {
fprintf(stderr,
"%d: %s can only be used with TCP\n",
linenum, "return-rst");
return NULL;
}
return &fil;
}
if (*cpp) {
if (!strcasecmp(*cpp, "dup-to") && *(cpp + 1)) {
cpp++;
if (to_interface(&fil.fr_dif, *cpp, linenum))
return NULL;
cpp++;
}
if (*cpp && !strcasecmp(*cpp, "to") && *(cpp + 1)) {
cpp++;
if (to_interface(&fil.fr_tif, *cpp, linenum))
return NULL;
cpp++;
} else if (*cpp && !strcasecmp(*cpp, "fastroute")) {
if (!(fil.fr_flags & FR_INQUE)) {
fprintf(stderr,
"can only use %s with 'in'\n",
"fastroute");
return NULL;
}
fil.fr_flags |= FR_FASTROUTE;
cpp++;
}
}
/*
* Set the "other" interface name. Lets you specify both
* inbound and outbound interfaces for state rules. Do not
* prevent both interfaces from being the same.
*/
strcpy(fil.fr_ifnames[3], "*");
if ((*cpp != NULL) && (*(cpp + 1) != NULL) &&
((((fil.fr_flags & FR_INQUE) != 0) &&
(strcasecmp(*cpp, "out-via") == 0)) ||
(((fil.fr_flags & FR_OUTQUE) != 0) &&
(strcasecmp(*cpp, "in-via") == 0)))) {
cpp++;
s = index(*cpp, ',');
if (s != NULL) {
*s++ = '\0';
(void)strncpy(fil.fr_ifnames[3], s,
IFNAMSIZ - 1);
fil.fr_ifnames[3][IFNAMSIZ - 1] = '\0';
}
(void)strncpy(fil.fr_ifnames[2], *cpp, IFNAMSIZ - 1);
fil.fr_ifnames[2][IFNAMSIZ - 1] = '\0';
cpp++;
} else
strcpy(fil.fr_ifnames[2], "*");
}
if (*cpp && !strcasecmp(*cpp, "tos")) {
if (!*++cpp) {
fprintf(stderr, "%d: tos missing value\n", linenum);
return NULL;
}
fil.fr_tos = strtol(*cpp, NULL, 0);
fil.fr_mip.fi_tos = 0xff;
cpp++;
}
if (*cpp && !strcasecmp(*cpp, "ttl")) {
if (!*++cpp) {
fprintf(stderr, "%d: ttl missing hopcount value\n",
linenum);
return NULL;
}
if (ratoi(*cpp, &i, 0, 255))
fil.fr_ttl = i;
else {
fprintf(stderr, "%d: invalid ttl (%s)\n",
linenum, *cpp);
return NULL;
}
fil.fr_mip.fi_ttl = 0xff;
cpp++;
}
/*
* check for "proto <protoname>" only decode udp/tcp/icmp as protoname
*/
proto = NULL;
if (*cpp && !strcasecmp(*cpp, "proto")) {
if (!*++cpp) {
fprintf(stderr, "%d: protocol name missing\n", linenum);
return NULL;
}
proto = *cpp++;
if (!strcasecmp(proto, "tcp/udp")) {
fil.fr_ip.fi_fl |= FI_TCPUDP;
fil.fr_mip.fi_fl |= FI_TCPUDP;
} else if (use_inet6 && !strcasecmp(proto, "icmp")) {
fprintf(stderr,
"%d: use proto ipv6-icmp with IPv6 (or use proto 1 if you really mean icmp)\n",
linenum);
} else {
if (!(p = getprotobyname(proto)) && !isdigit(*proto)) {
fprintf(stderr,
"%d: unknown protocol (%s)\n",
linenum, proto);
return NULL;
}
if (p)
fil.fr_proto = p->p_proto;
else if (isdigit(*proto)) {
i = (int)strtol(proto, &endptr, 0);
if (*endptr != '\0' || i < 0 || i > 255) {
fprintf(stderr,
"%d: unknown protocol (%s)\n",
linenum, proto);
return NULL;
}
fil.fr_proto = i;
}
fil.fr_mip.fi_p = 0xff;
}
}
if ((fil.fr_proto != IPPROTO_TCP) &&
((fil.fr_flags & FR_RETMASK) == FR_RETRST)) {
fprintf(stderr, "%d: %s can only be used with TCP\n",
linenum, "return-rst");
return NULL;
}
/*
* get the from host and bit mask to use against packets
*/
if (!*cpp) {
fprintf(stderr, "%d: missing source specification\n", linenum);
return NULL;
}
if (!strcasecmp(*cpp, "all")) {
cpp++;
if (!*cpp)
return &fil;
} else {
if (strcasecmp(*cpp, "from")) {
fprintf(stderr, "%d: unexpected keyword (%s) - from\n",
linenum, *cpp);
return NULL;
}
if (!*++cpp) {
fprintf(stderr, "%d: missing host after from\n",
linenum);
return NULL;
}
if (!strcmp(*cpp, "!")) {
fil.fr_flags |= FR_NOTSRCIP;
if (!*++cpp) {
fprintf(stderr,
"%d: missing host after from\n",
linenum);
return NULL;
}
} else if (**cpp == '!') {
fil.fr_flags |= FR_NOTSRCIP;
(*cpp)++;
}
ch = 0;
if (hostmask(&cpp, (u_32_t *)&fil.fr_src,
(u_32_t *)&fil.fr_smsk, &fil.fr_sport, &ch,
&fil.fr_stop, linenum)) {
return NULL;
}
if ((ch != 0) && (fil.fr_proto != IPPROTO_TCP) &&
(fil.fr_proto != IPPROTO_UDP) &&
!(fil.fr_ip.fi_fl & FI_TCPUDP)) {
fprintf(stderr,
"%d: cannot use port and neither tcp or udp\n",
linenum);
return NULL;
}
fil.fr_scmp = ch;
if (!*cpp) {
fprintf(stderr, "%d: missing to fields\n", linenum);
return NULL;
}
/*
* do the same for the to field (destination host)
*/
if (strcasecmp(*cpp, "to")) {
fprintf(stderr, "%d: unexpected keyword (%s) - to\n",
linenum, *cpp);
return NULL;
}
if (!*++cpp) {
fprintf(stderr, "%d: missing host after to\n", linenum);
return NULL;
}
ch = 0;
if (!strcmp(*cpp, "!")) {
fil.fr_flags |= FR_NOTDSTIP;
if (!*++cpp) {
fprintf(stderr,
"%d: missing host after from\n",
linenum);
return NULL;
}
} else if (**cpp == '!') {
fil.fr_flags |= FR_NOTDSTIP;
(*cpp)++;
}
if (hostmask(&cpp, (u_32_t *)&fil.fr_dst,
(u_32_t *)&fil.fr_dmsk, &fil.fr_dport, &ch,
&fil.fr_dtop, linenum)) {
return NULL;
}
if ((ch != 0) && (fil.fr_proto != IPPROTO_TCP) &&
(fil.fr_proto != IPPROTO_UDP) &&
!(fil.fr_ip.fi_fl & FI_TCPUDP)) {
fprintf(stderr,
"%d: cannot use port and neither tcp or udp\n",
linenum);
return NULL;
}
fil.fr_dcmp = ch;
}
/*
* check some sanity, make sure we don't have icmp checks with tcp
* or udp or visa versa.
*/
if (fil.fr_proto && (fil.fr_dcmp || fil.fr_scmp) &&
fil.fr_proto != IPPROTO_TCP && fil.fr_proto != IPPROTO_UDP) {
fprintf(stderr, "%d: port operation on non tcp/udp\n", linenum);
return NULL;
}
if (fil.fr_icmp && fil.fr_proto != IPPROTO_ICMP) {
fprintf(stderr, "%d: icmp comparisons on wrong protocol\n",
linenum);
return NULL;
}
if (!*cpp)
return &fil;
if (*cpp && !strcasecmp(*cpp, "flags")) {
if (!*++cpp) {
fprintf(stderr, "%d: no flags present\n", linenum);
return NULL;
}
fil.fr_tcpf = tcp_flags(*cpp, &fil.fr_tcpfm, linenum);
cpp++;
}
/*
* extras...
*/
if ((fil.fr_v == 4) && *cpp && (!strcasecmp(*cpp, "with") ||
!strcasecmp(*cpp, "and")))
if (extras(&cpp, &fil, linenum))
return NULL;
/*
* icmp types for use with the icmp protocol
*/
if (*cpp && !strcasecmp(*cpp, "icmp-type")) {
if (fil.fr_proto != IPPROTO_ICMP &&
fil.fr_proto != IPPROTO_ICMPV6) {
fprintf(stderr,
"%d: icmp with wrong protocol (%d)\n",
linenum, fil.fr_proto);
return NULL;
}
if (addicmp(&cpp, &fil, linenum))
return NULL;
fil.fr_icmp = htons(fil.fr_icmp);
fil.fr_icmpm = htons(fil.fr_icmpm);
}
/*
* Keep something...
*/
while (*cpp && !strcasecmp(*cpp, "keep"))
if (addkeep(&cpp, &fil, linenum))
return NULL;
/*
* This is here to enforce the old interface binding behaviour.
* That is, "on X" is equivalent to "<dir> on X <!dir>-via -,X"
*/
if (fil.fr_flags & FR_KEEPSTATE) {
if (*fil.fr_ifnames[0] && !*fil.fr_ifnames[3]) {
bcopy(fil.fr_ifnames[0], fil.fr_ifnames[3],
sizeof(fil.fr_ifnames[3]));
strncpy(fil.fr_ifnames[2], "*",
sizeof(fil.fr_ifnames[3]));
}
}
/*
* head of a new group ?
*/
if (*cpp && !strcasecmp(*cpp, "head")) {
if (fil.fr_skip != 0) {
fprintf(stderr, "%d: cannot use skip with head\n",
linenum);
return NULL;
}
if (!*++cpp) {
fprintf(stderr, "%d: head without group #\n", linenum);
return NULL;
}
if (ratoui(*cpp, &k, 0, UINT_MAX))
fil.fr_grhead = (u_32_t)k;
else {
fprintf(stderr, "%d: invalid group (%s)\n",
linenum, *cpp);
return NULL;
}
cpp++;
}
/*
* head of a new group ?
*/
if (*cpp && !strcasecmp(*cpp, "group")) {
if (!*++cpp) {
fprintf(stderr, "%d: group without group #\n",
linenum);
return NULL;
}
if (ratoui(*cpp, &k, 0, UINT_MAX))
fil.fr_group = k;
else {
fprintf(stderr, "%d: invalid group (%s)\n",
linenum, *cpp);
return NULL;
}
cpp++;
}
/*
* leftovers...yuck
*/
if (*cpp && **cpp) {
fprintf(stderr, "%d: unknown words at end: [", linenum);
for (; *cpp; cpp++)
fprintf(stderr, "%s ", *cpp);
fprintf(stderr, "]\n");
return NULL;
}
/*
* lazy users...
*/
if ((fil.fr_tcpf || fil.fr_tcpfm) && fil.fr_proto != IPPROTO_TCP) {
fprintf(stderr, "%d: TCP protocol not specified\n", linenum);
return NULL;
}
if (!(fil.fr_ip.fi_fl & FI_TCPUDP) && (fil.fr_proto != IPPROTO_TCP) &&
(fil.fr_proto != IPPROTO_UDP) && (fil.fr_dcmp || fil.fr_scmp)) {
if (!fil.fr_proto) {
fil.fr_ip.fi_fl |= FI_TCPUDP;
fil.fr_mip.fi_fl |= FI_TCPUDP;
} else {
fprintf(stderr,
"%d: port comparisons for non-TCP/UDP\n",
linenum);
return NULL;
}
}
/*
if ((fil.fr_flags & FR_KEEPFRAG) &&
(!(fil.fr_ip.fi_fl & FI_FRAG) || !(fil.fr_ip.fi_fl & FI_FRAG))) {
fprintf(stderr,
"%d: must use 'with frags' with 'keep frags'\n",
linenum);
return NULL;
}
*/
return &fil;
}
int loglevel(cpp, facpri, linenum)
char **cpp;
u_int *facpri;
int linenum;
{
int fac, pri;
char *s;
fac = 0;
pri = 0;
if (!*++cpp) {
fprintf(stderr, "%d: %s\n", linenum,
"missing identifier after level");
return -1;
}
s = index(*cpp, '.');
if (s) {
*s++ = '\0';
fac = fac_findname(*cpp);
if (fac == -1) {
fprintf(stderr, "%d: %s %s\n", linenum,
"Unknown facility", *cpp);
return -1;
}
pri = pri_findname(s);
if (pri == -1) {
fprintf(stderr, "%d: %s %s\n", linenum,
"Unknown priority", s);
return -1;
}
} else {
pri = pri_findname(*cpp);
if (pri == -1) {
fprintf(stderr, "%d: %s %s\n", linenum,
"Unknown priority", *cpp);
return -1;
}
}
*facpri = fac|pri;
return 0;
}
int to_interface(fdp, to, linenum)
frdest_t *fdp;
char *to;
int linenum;
{
char *s;
s = index(to, ':');
fdp->fd_ifp = NULL;
if (s) {
*s++ = '\0';
if (hostnum((u_32_t *)&fdp->fd_ip, s, linenum) == -1)
return -1;
}
(void) strncpy(fdp->fd_ifname, to, sizeof(fdp->fd_ifname) - 1);
fdp->fd_ifname[sizeof(fdp->fd_ifname) - 1] = '\0';
return 0;
}
void print_toif(tag, fdp)
char *tag;
frdest_t *fdp;
{
printf("%s %s%s", tag, fdp->fd_ifname,
(fdp->fd_ifp || (long)fdp->fd_ifp == -1) ? "" : "(!)");
#ifdef USE_INET6
if (use_inet6 && IP6_NOTZERO(&fdp->fd_ip6.in6)) {
char ipv6addr[80];
inet_ntop(AF_INET6, &fdp->fd_ip6, ipv6addr,
sizeof(fdp->fd_ip6));
printf(":%s", ipv6addr);
} else
#endif
if (fdp->fd_ip.s_addr)
printf(":%s", inet_ntoa(fdp->fd_ip));
putchar(' ');
}
/*
* deal with extra bits on end of the line
*/
int extras(cp, fr, linenum)
char ***cp;
struct frentry *fr;
int linenum;
{
u_short secmsk;
u_long opts;
int notopt;
char oflags;
opts = 0;
secmsk = 0;
notopt = 0;
(*cp)++;
if (!**cp)
return -1;
while (**cp && (!strncasecmp(**cp, "ipopt", 5) ||
!strcasecmp(**cp, "not") || !strncasecmp(**cp, "opt", 3) ||
!strncasecmp(**cp, "frag", 4) || !strcasecmp(**cp, "no") ||
!strcasecmp(**cp, "short"))) {
if (***cp == 'n' || ***cp == 'N') {
notopt = 1;
(*cp)++;
continue;
} else if (***cp == 'i' || ***cp == 'I') {
if (!notopt)
fr->fr_ip.fi_fl |= FI_OPTIONS;
fr->fr_mip.fi_fl |= FI_OPTIONS;
goto nextopt;
} else if (***cp == 'f' || ***cp == 'F') {
if (!notopt)
fr->fr_ip.fi_fl |= FI_FRAG;
fr->fr_mip.fi_fl |= FI_FRAG;
goto nextopt;
} else if (***cp == 'o' || ***cp == 'O') {
if (!*(*cp + 1)) {
fprintf(stderr,
"%d: opt missing arguements\n",
linenum);
return -1;
}
(*cp)++;
if (!(opts = optname(cp, &secmsk, linenum)))
return -1;
oflags = FI_OPTIONS;
} else if (***cp == 's' || ***cp == 'S') {
if (fr->fr_tcpf) {
fprintf(stderr,
"%d: short cannot be used with TCP flags\n",
linenum);
return -1;
}
if (!notopt)
fr->fr_ip.fi_fl |= FI_SHORT;
fr->fr_mip.fi_fl |= FI_SHORT;
goto nextopt;
} else
return -1;
if (!notopt || !opts)
fr->fr_mip.fi_fl |= oflags;
if (notopt) {
if (!secmsk) {
fr->fr_mip.fi_optmsk |= opts;
} else {
fr->fr_mip.fi_optmsk |= (opts & ~0x0100);
}
} else {
fr->fr_mip.fi_optmsk |= opts;
}
fr->fr_mip.fi_secmsk |= secmsk;
if (notopt) {
fr->fr_ip.fi_fl &= (~oflags & 0xf);
fr->fr_ip.fi_optmsk &= ~opts;
fr->fr_ip.fi_secmsk &= ~secmsk;
} else {
fr->fr_ip.fi_fl |= oflags;
fr->fr_ip.fi_optmsk |= opts;
fr->fr_ip.fi_secmsk |= secmsk;
}
nextopt:
notopt = 0;
opts = 0;
oflags = 0;
secmsk = 0;
(*cp)++;
}
return 0;
}
u_32_t optname(cp, sp, linenum)
char ***cp;
u_short *sp;
int linenum;
{
struct ipopt_names *io, *so;
u_long msk = 0;
u_short smsk = 0;
char *s;
int sec = 0;
for (s = strtok(**cp, ","); s; s = strtok(NULL, ",")) {
for (io = ionames; io->on_name; io++)
if (!strcasecmp(s, io->on_name)) {
msk |= io->on_bit;
break;
}
if (!io->on_name) {
fprintf(stderr, "%d: unknown IP option name %s\n",
linenum, s);
return 0;
}
if (!strcasecmp(s, "sec-class"))
sec = 1;
}
if (sec && !*(*cp + 1)) {
fprintf(stderr, "%d: missing security level after sec-class\n",
linenum);
return 0;
}
if (sec) {
(*cp)++;
for (s = strtok(**cp, ","); s; s = strtok(NULL, ",")) {
for (so = secclass; so->on_name; so++)
if (!strcasecmp(s, so->on_name)) {
smsk |= so->on_bit;
break;
}
if (!so->on_name) {
fprintf(stderr,
"%d: no such security level: %s\n",
linenum, s);
return 0;
}
}
if (smsk)
*sp = smsk;
}
return msk;
}
#ifdef __STDC__
void optprint(u_short *sec, u_long optmsk, u_long optbits)
#else
void optprint(sec, optmsk, optbits)
u_short *sec;
u_long optmsk, optbits;
#endif
{
u_short secmsk = sec[0], secbits = sec[1];
struct ipopt_names *io, *so;
char *s;
s = " opt ";
for (io = ionames; io->on_name; io++)
if ((io->on_bit & optmsk) &&
((io->on_bit & optmsk) == (io->on_bit & optbits))) {
if ((io->on_value != IPOPT_SECURITY) ||
(!secmsk && !secbits)) {
printf("%s%s", s, io->on_name);
if (io->on_value == IPOPT_SECURITY)
io++;
s = ",";
}
}
if (secmsk & secbits) {
printf("%ssec-class", s);
s = " ";
for (so = secclass; so->on_name; so++)
if ((secmsk & so->on_bit) &&
((so->on_bit & secmsk) == (so->on_bit & secbits))) {
printf("%s%s", s, so->on_name);
s = ",";
}
}
if ((optmsk && (optmsk != optbits)) ||
(secmsk && (secmsk != secbits))) {
s = " ";
printf(" not opt");
if (optmsk != optbits) {
for (io = ionames; io->on_name; io++)
if ((io->on_bit & optmsk) &&
((io->on_bit & optmsk) !=
(io->on_bit & optbits))) {
if ((io->on_value != IPOPT_SECURITY) ||
(!secmsk && !secbits)) {
printf("%s%s", s, io->on_name);
s = ",";
if (io->on_value ==
IPOPT_SECURITY)
io++;
} else
io++;
}
}
if (secmsk != secbits) {
printf("%ssec-class", s);
s = " ";
for (so = secclass; so->on_name; so++)
if ((so->on_bit & secmsk) &&
((so->on_bit & secmsk) !=
(so->on_bit & secbits))) {
printf("%s%s", s, so->on_name);
s = ",";
}
}
}
}
char *icmptypes[] = {
"echorep", (char *)NULL, (char *)NULL, "unreach", "squench",
"redir", (char *)NULL, (char *)NULL, "echo", "routerad",
"routersol", "timex", "paramprob", "timest", "timestrep",
"inforeq", "inforep", "maskreq", "maskrep", "END"
};
/*
* set the icmp field to the correct type if "icmp" word is found
*/
int addicmp(cp, fp, linenum)
char ***cp;
struct frentry *fp;
int linenum;
{
char **t;
int i;
(*cp)++;
if (!**cp)
return -1;
if (isdigit(***cp)) {
if (!ratoi(**cp, &i, 0, 255)) {
fprintf(stderr,
"%d: Invalid icmp-type (%s) specified\n",
linenum, **cp);
return -1;
}
} else if (fp->fr_proto == IPPROTO_ICMPV6) {
fprintf(stderr, "%d: Unknown ICMPv6 type (%s) specified, %s",
linenum, **cp, "(use numeric value instead\n");
return -1;
} else {
for (t = icmptypes, i = 0; ; t++, i++) {
if (!*t)
continue;
if (!strcasecmp("END", *t)) {
i = -1;
break;
}
if (!strcasecmp(*t, **cp))
break;
}
if (i == -1) {
fprintf(stderr,
"%d: Invalid icmp-type (%s) specified\n",
linenum, **cp);
return -1;
}
}
fp->fr_icmp = (u_short)(i << 8);
fp->fr_icmpm = (u_short)0xff00;
(*cp)++;
if (!**cp)
return 0;
if (**cp && strcasecmp("code", **cp))
return 0;
(*cp)++;
if (isdigit(***cp)) {
if (!ratoi(**cp, &i, 0, 255)) {
fprintf(stderr,
"%d: Invalid icmp code (%s) specified\n",
linenum, **cp);
return -1;
}
} else {
i = icmpcode(**cp);
if (i == -1) {
fprintf(stderr,
"%d: Invalid icmp code (%s) specified\n",
linenum, **cp);
return -1;
}
}
i &= 0xff;
fp->fr_icmp |= (u_short)i;
fp->fr_icmpm = (u_short)0xffff;
(*cp)++;
return 0;
}
#define MAX_ICMPCODE 15
char *icmpcodes[] = {
"net-unr", "host-unr", "proto-unr", "port-unr", "needfrag",
"srcfail", "net-unk", "host-unk", "isolate", "net-prohib",
"host-prohib", "net-tos", "host-tos", "filter-prohib", "host-preced",
"preced-cutoff", NULL };
/*
* Return the number for the associated ICMP unreachable code.
*/
int icmpcode(str)
char *str;
{
char *s;
int i, len;
if ((s = strrchr(str, ')')))
*s = '\0';
if (isdigit(*str)) {
if (!ratoi(str, &i, 0, 255))
return -1;
else
return i;
}
len = strlen(str);
for (i = 0; icmpcodes[i]; i++)
if (!strncasecmp(str, icmpcodes[i], MIN(len,
strlen(icmpcodes[i])) ))
return i;
return -1;
}
/*
* set the icmp field to the correct type if "icmp" word is found
*/
int addkeep(cp, fp, linenum)
char ***cp;
struct frentry *fp;
int linenum;
{
char *s;
(*cp)++;
if (!**cp) {
fprintf(stderr, "%d: Missing keyword after keep\n",
linenum);
return -1;
}
if (strcasecmp(**cp, "state") == 0)
fp->fr_flags |= FR_KEEPSTATE;
else if (strncasecmp(**cp, "frag", 4) == 0)
fp->fr_flags |= FR_KEEPFRAG;
else if (strcasecmp(**cp, "state-age") == 0) {
if (fp->fr_ip.fi_p == IPPROTO_TCP) {
fprintf(stderr, "%d: cannot use state-age with tcp\n",
linenum);
return -1;
}
if ((fp->fr_flags & FR_KEEPSTATE) == 0) {
fprintf(stderr, "%d: state-age with no 'keep state'\n",
linenum);
return -1;
}
(*cp)++;
if (!**cp) {
fprintf(stderr, "%d: state-age with no arg\n",
linenum);
return -1;
}
fp->fr_age[0] = atoi(**cp);
s = index(**cp, '/');
if (s != NULL) {
s++;
fp->fr_age[1] = atoi(s);
} else
fp->fr_age[1] = fp->fr_age[0];
} else {
fprintf(stderr, "%d: Unrecognised state keyword \"%s\"\n",
linenum, **cp);
return -1;
}
(*cp)++;
return 0;
}
void printifname(format, name, ifp)
char *format, *name;
void *ifp;
{
printf("%s%s", format, name);
if ((ifp == NULL) && strcmp(name, "-") && strcmp(name, "*"))
printf("(!)");
}
/*
* print the filter structure in a useful way
*/
void printfr(fp)
struct frentry *fp;
{
struct protoent *p;
u_short sec[2];
char *s;
u_char *t;
int pr;
if (fp->fr_flags & FR_PASS)
printf("pass");
if (fp->fr_flags & FR_NOMATCH)
printf("nomatch");
else if (fp->fr_flags & FR_BLOCK) {
printf("block");
if (fp->fr_flags & FR_RETICMP) {
if ((fp->fr_flags & FR_RETMASK) == FR_FAKEICMP)
printf(" return-icmp-as-dest");
else if ((fp->fr_flags & FR_RETMASK) == FR_RETICMP)
printf(" return-icmp");
if (fp->fr_icode) {
if (fp->fr_icode <= MAX_ICMPCODE)
printf("(%s)",
icmpcodes[(int)fp->fr_icode]);
else
printf("(%d)", fp->fr_icode);
}
} else if ((fp->fr_flags & FR_RETMASK) == FR_RETRST)
printf(" return-rst");
} else if ((fp->fr_flags & FR_LOGMASK) == FR_LOG) {
printlog(fp);
} else if (fp->fr_flags & FR_ACCOUNT)
printf("count");
else if (fp->fr_flags & FR_AUTH)
printf("auth");
else if (fp->fr_flags & FR_PREAUTH)
printf("preauth");
else if (fp->fr_skip)
printf("skip %hu", fp->fr_skip);
if (fp->fr_flags & FR_OUTQUE)
printf(" out ");
else
printf(" in ");
if (((fp->fr_flags & FR_LOGB) == FR_LOGB) ||
((fp->fr_flags & FR_LOGP) == FR_LOGP)) {
printlog(fp);
putchar(' ');
}
if (fp->fr_flags & FR_QUICK)
printf("quick ");
if (*fp->fr_ifname) {
printifname("on ", fp->fr_ifname, fp->fr_ifa);
if (*fp->fr_ifnames[1] && strcmp(fp->fr_ifnames[1], "*"))
printifname(",", fp->fr_ifnames[1], fp->fr_ifas[1]);
putchar(' ');
if (*fp->fr_dif.fd_ifname)
print_toif("dup-to", &fp->fr_dif);
if (*fp->fr_tif.fd_ifname)
print_toif("to", &fp->fr_tif);
if (fp->fr_flags & FR_FASTROUTE)
printf("fastroute ");
if ((*fp->fr_ifnames[2] && strcmp(fp->fr_ifnames[2], "*")) ||
(*fp->fr_ifnames[3] && strcmp(fp->fr_ifnames[3], "*"))) {
if (fp->fr_flags & FR_OUTQUE)
printf("in-via ");
else
printf("out-via ");
if (*fp->fr_ifnames[2]) {
printifname("", fp->fr_ifnames[2],
fp->fr_ifas[2]);
putchar(',');
}
if (*fp->fr_ifnames[3])
printifname("", fp->fr_ifnames[3],
fp->fr_ifas[3]);
putchar(' ');
}
}
if (fp->fr_mip.fi_tos)
printf("tos %#x ", fp->fr_tos);
if (fp->fr_mip.fi_ttl)
printf("ttl %d ", fp->fr_ttl);
if (fp->fr_ip.fi_fl & FI_TCPUDP) {
printf("proto tcp/udp ");
pr = -1;
} else if ((pr = fp->fr_mip.fi_p)) {
if ((p = getprotobynumber(fp->fr_proto)))
printf("proto %s ", p->p_name);
else
printf("proto %d ", fp->fr_proto);
}
printf("from %s", fp->fr_flags & FR_NOTSRCIP ? "!" : "");
printhostmask(fp->fr_v, (u_32_t *)&fp->fr_src.s_addr,
(u_32_t *)&fp->fr_smsk.s_addr);
if (fp->fr_scmp)
printportcmp(pr, &fp->fr_tuc.ftu_src);
printf(" to %s", fp->fr_flags & FR_NOTDSTIP ? "!" : "");
printhostmask(fp->fr_v, (u_32_t *)&fp->fr_dst.s_addr,
(u_32_t *)&fp->fr_dmsk.s_addr);
if (fp->fr_dcmp)
printportcmp(pr, &fp->fr_tuc.ftu_dst);
if ((fp->fr_ip.fi_fl & ~FI_TCPUDP) ||
(fp->fr_mip.fi_fl & ~FI_TCPUDP) ||
fp->fr_ip.fi_optmsk || fp->fr_mip.fi_optmsk ||
fp->fr_ip.fi_secmsk || fp->fr_mip.fi_secmsk) {
printf(" with");
if (fp->fr_ip.fi_optmsk || fp->fr_mip.fi_optmsk ||
fp->fr_ip.fi_secmsk || fp->fr_mip.fi_secmsk) {
sec[0] = fp->fr_mip.fi_secmsk;
sec[1] = fp->fr_ip.fi_secmsk;
optprint(sec,
fp->fr_mip.fi_optmsk, fp->fr_ip.fi_optmsk);
} else if (fp->fr_mip.fi_fl & FI_OPTIONS) {
if (!(fp->fr_ip.fi_fl & FI_OPTIONS))
printf(" not");
printf(" ipopt");
}
if (fp->fr_mip.fi_fl & FI_SHORT) {
if (!(fp->fr_ip.fi_fl & FI_SHORT))
printf(" not");
printf(" short");
}
if (fp->fr_mip.fi_fl & FI_FRAG) {
if (!(fp->fr_ip.fi_fl & FI_FRAG))
printf(" not");
printf(" frag");
}
}
if (fp->fr_proto == IPPROTO_ICMP && fp->fr_icmpm != 0) {
int type = fp->fr_icmp, code;
type = ntohs(fp->fr_icmp);
code = type & 0xff;
type /= 256;
if (type < (sizeof(icmptypes) / sizeof(char *) - 1) &&
icmptypes[type])
printf(" icmp-type %s", icmptypes[type]);
else
printf(" icmp-type %d", type);
if (ntohs(fp->fr_icmpm) & 0xff)
printf(" code %d", code);
}
if (fp->fr_proto == IPPROTO_ICMPV6 && fp->fr_icmpm != 0) {
int type = fp->fr_icmp, code;
type = ntohs(fp->fr_icmp);
code = type & 0xff;
type /= 256;
printf(" icmp-type %d", type);
if (ntohs(fp->fr_icmpm) & 0xff)
printf(" code %d", code);
}
if (fp->fr_proto == IPPROTO_TCP && (fp->fr_tcpf || fp->fr_tcpfm)) {
printf(" flags ");
if (fp->fr_tcpf & ~TCPF_ALL)
printf("0x%x", fp->fr_tcpf);
else
for (s = flagset, t = flags; *s; s++, t++)
if (fp->fr_tcpf & *t)
(void)putchar(*s);
if (fp->fr_tcpfm) {
(void)putchar('/');
if (fp->fr_tcpfm & ~TCPF_ALL)
printf("0x%x", fp->fr_tcpfm);
else
for (s = flagset, t = flags; *s; s++, t++)
if (fp->fr_tcpfm & *t)
(void)putchar(*s);
}
}
if (fp->fr_flags & FR_KEEPSTATE)
printf(" keep state");
if (fp->fr_flags & FR_KEEPFRAG)
printf(" keep frags");
if (fp->fr_age[0] != 0 || fp->fr_age[1]!= 0)
printf(" state-age %u/%u", fp->fr_age[0], fp->fr_age[1]);
if (fp->fr_grhead)
printf(" head %d", fp->fr_grhead);
if (fp->fr_group)
printf(" group %d", fp->fr_group);
(void)putchar('\n');
}
void binprint(fp)
struct frentry *fp;
{
int i = sizeof(*fp), j = 0;
u_char *s;
for (s = (u_char *)fp; i; i--, s++) {
j++;
printf("%02x ", *s);
if (j == 16) {
printf("\n");
j = 0;
}
}
putchar('\n');
(void)fflush(stdout);
}
void printlog(fp)
frentry_t *fp;
{
char *s, *u;
printf("log");
if (fp->fr_flags & FR_LOGBODY)
printf(" body");
if (fp->fr_flags & FR_LOGFIRST)
printf(" first");
if (fp->fr_flags & FR_LOGORBLOCK)
printf(" or-block");
if (fp->fr_loglevel != 0xffff) {
printf(" level ");
if (fp->fr_loglevel & LOG_FACMASK) {
s = fac_toname(fp->fr_loglevel);
if (s == NULL)
s = "!!!";
} else
s = "";
u = pri_toname(fp->fr_loglevel);
if (u == NULL)
u = "!!!";
if (*s)
printf("%s.%s", s, u);
else
printf("%s", u);
}
}
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