%{

#include "ipf.h"

#undef OPT_NAT

#undef OPT_VERBOSE

#include "ipmon_l.h"

#include "ipmon.h"

#define YYDEBUG 1

extern void yyerror __P((char *));

extern int yyparse __P((void));

extern int yylex __P((void));

extern int yydebug;

extern FILE *yyin;

extern int yylineNum;

typedef struct opt {

struct opt *o_next;

int o_line;

int o_type;

int o_num;

char *o_str;

struct in_addr o_ip;

} opt_t;

static void build_action __P((struct opt *));

static opt_t *new_opt __P((int));

static action_t *alist = NULL;

%}

%union {

char *str;

u_32_t num;

struct in_addr addr;

struct opt *opt;

union i6addr ip6;

}

%token <num> YY_NUMBER YY_HEX

%token <str> YY_STR

%token YY_COMMENT

%token YY_CMP_EQ YY_CMP_NE YY_CMP_LE YY_CMP_GE YY_CMP_LT YY_CMP_GT

%token YY_RANGE_OUT YY_RANGE_IN

%token <ip6> YY_IPV6

%token IPM_ACTION IPM_BODY IPM_COMMENT IPM_DIRECTION IPM_DSTIP IPM_DSTPORT

%token IPM_EVERY IPM_EXECUTE IPM_GROUP IPM_INTERFACE IPM_IN IPM_NO IPM_OUT

%token IPM_PACKET IPM_PACKETS IPM_POOL IPM_PROTOCOL IPM_RESULT IPM_RULE

%token IPM_SECOND IPM_SECONDS IPM_SRCIP IPM_SRCPORT IPM_TAG IPM_YES

%type <addr> ipv4

%type <opt> direction dstip dstport every execute group interface option

%type <opt> options protocol result rule srcip srcport tag

%%

file: line

| assign

| file line

| file assign

;

line: IPM_ACTION '{' options '}' ';' { build_action($3); resetlexer(); }

| IPM_COMMENT

;

assign: YY_STR assigning YY_STR ';' { set_variable($1, $3);

resetlexer();

free($1);

free($3);

}

;

assigning:

'=' { yyvarnext = 1; }

;

options:

option { $$ = $1; }

| option ',' options { $1->o_next = $3; $$ = $1; }

;

option: direction { $$ = $1; }

| dstip { $$ = $1; }

| dstport { $$ = $1; }

| every { $$ = $1; }

| execute { $$ = $1; }

| group { $$ = $1; }

| interface { $$ = $1; }

| protocol { $$ = $1; }

| result { $$ = $1; }

| rule { $$ = $1; }

| srcip { $$ = $1; }

| srcport { $$ = $1; }

| tag { $$ = $1; }

;

direction:

IPM_DIRECTION '=' IPM_IN { $$ = new_opt(IPM_DIRECTION);

$$->o_num = IPM_IN; }

| IPM_DIRECTION '=' IPM_OUT { $$ = new_opt(IPM_DIRECTION);

$$->o_num = IPM_OUT; }

;

dstip: IPM_DSTIP '=' ipv4 '/' YY_NUMBER { $$ = new_opt(IPM_DSTIP);

$$->o_ip = $3;

$$->o_num = $5; }

;

dstport:

IPM_DSTPORT '=' YY_NUMBER { $$ = new_opt(IPM_DSTPORT);

$$->o_num = $3; }

| IPM_DSTPORT '=' YY_STR { $$ = new_opt(IPM_DSTPORT);

$$->o_str = $3; }

;

every: IPM_EVERY IPM_SECOND { $$ = new_opt(IPM_SECOND);

$$->o_num = 1; }

| IPM_EVERY YY_NUMBER IPM_SECONDS { $$ = new_opt(IPM_SECOND);

$$->o_num = $2; }

| IPM_EVERY IPM_PACKET { $$ = new_opt(IPM_PACKET);

$$->o_num = 1; }

| IPM_EVERY YY_NUMBER IPM_PACKETS { $$ = new_opt(IPM_PACKET);

$$->o_num = $2; }

;

execute:

IPM_EXECUTE '=' YY_STR { $$ = new_opt(IPM_EXECUTE);

$$->o_str = $3; }

;

group: IPM_GROUP '=' YY_NUMBER { $$ = new_opt(IPM_GROUP);

$$->o_num = $3; }

| IPM_GROUP '=' YY_STR { $$ = new_opt(IPM_GROUP);

$$->o_str = $3; }

;

interface:

IPM_INTERFACE '=' YY_STR { $$ = new_opt(IPM_INTERFACE);

$$->o_str = $3; }

;

protocol:

IPM_PROTOCOL '=' YY_NUMBER { $$ = new_opt(IPM_PROTOCOL);

$$->o_num = $3; }

| IPM_PROTOCOL '=' YY_STR { $$ = new_opt(IPM_PROTOCOL);

$$->o_num = getproto($3);

free($3);

}

;

result: IPM_RESULT '=' YY_STR { $$ = new_opt(IPM_RESULT);

$$->o_str = $3; }

;

rule: IPM_RULE '=' YY_NUMBER { $$ = new_opt(IPM_RULE);

$$->o_num = YY_NUMBER; }

;

srcip: IPM_SRCIP '=' ipv4 '/' YY_NUMBER { $$ = new_opt(IPM_SRCIP);

$$->o_ip = $3;

$$->o_num = $5; }

;

srcport:

IPM_SRCPORT '=' YY_NUMBER { $$ = new_opt(IPM_SRCPORT);

$$->o_num = $3; }

| IPM_SRCPORT '=' YY_STR { $$ = new_opt(IPM_SRCPORT);

$$->o_str = $3; }

;

tag: IPM_TAG '=' YY_NUMBER { $$ = new_opt(IPM_TAG);

$$->o_num = $3; }

;

ipv4: YY_NUMBER '.' YY_NUMBER '.' YY_NUMBER '.' YY_NUMBER

{ if ($1 > 255 || $3 > 255 || $5 > 255 || $7 > 255) {

yyerror("Invalid octet string for IP address");

return 0;

}

$$.s_addr = ($1 << 24) | ($3 << 16) | ($5 << 8) | $7;

$$.s_addr = htonl($$.s_addr);

}

%%

static struct wordtab yywords[] = {

{ "action", IPM_ACTION },

{ "body", IPM_BODY },

{ "direction", IPM_DIRECTION },

{ "dstip", IPM_DSTIP },

{ "dstport", IPM_DSTPORT },

{ "every", IPM_EVERY },

{ "execute", IPM_EXECUTE },

{ "group", IPM_GROUP },

{ "in", IPM_IN },

{ "interface", IPM_INTERFACE },

{ "no", IPM_NO },

{ "out", IPM_OUT },

{ "packet", IPM_PACKET },

{ "packets", IPM_PACKETS },

{ "protocol", IPM_PROTOCOL },

{ "result", IPM_RESULT },

{ "rule", IPM_RULE },

{ "second", IPM_SECOND },

{ "seconds", IPM_SECONDS },

{ "srcip", IPM_SRCIP },

{ "srcport", IPM_SRCPORT },

{ "tag", IPM_TAG },

{ "yes", IPM_YES },

{ NULL, 0 }

};

static int macflags[15][2] = {

{ IPM_DIRECTION, IPMAC_DIRECTION },

{ IPM_DSTIP, IPMAC_DSTIP },

{ IPM_DSTPORT, IPMAC_DSTPORT },

{ IPM_EXECUTE, IPMAC_EXECUTE },

{ IPM_GROUP, IPMAC_GROUP },

{ IPM_INTERFACE, IPMAC_INTERFACE },

{ IPM_PACKET, IPMAC_EVERY },

{ IPM_PROTOCOL, IPMAC_PROTOCOL },

{ IPM_RESULT, IPMAC_RESULT },

{ IPM_RULE, IPMAC_RULE },

{ IPM_SECOND, IPMAC_EVERY },

{ IPM_SRCIP, IPMAC_SRCIP },

{ IPM_SRCPORT, IPMAC_SRCPORT },

{ IPM_TAG, IPMAC_TAG },

{ 0, 0 }

};

static opt_t *new_opt(type)

int type;

{

opt_t *o;

o = (opt_t *)malloc(sizeof(*o));

o->o_type = type;

o->o_line = yylineNum;

o->o_num = 0;

o->o_str = (char *)0;

return o;

}

static void build_action(olist)

opt_t *olist;

{

action_t *a;

opt_t *o;

u_32_t m;

char c;

int i;

a = (action_t *)calloc(1, sizeof(*a));

if (!a)

return;

while ((o = olist)) {

for (i = 0; macflags[i][0]; i++)

if (macflags[i][0] == o->o_type)

break;

if (macflags[i][1] & a->ac_mflag) {

fprintf(stderr, "%s redfined on line %d\n",

yykeytostr(o->o_type), yylineNum);

if (o->o_str != NULL)

free(o->o_str);

olist = o->o_next;

free(o);

continue;

}

a->ac_mflag |= macflags[i][1];

switch (o->o_type)

{

case IPM_DIRECTION :

a->ac_direction = o->o_num;

break;

case IPM_DSTIP :

a->ac_dip = o->o_ip.s_addr;

for (i = o->o_num, m = 0; i; i--) {

m >>= 1;

m |= 0x80000000;

}

a->ac_dmsk = htonl(m);

break;

case IPM_DSTPORT :

a->ac_dport = htons(o->o_num);

break;

case IPM_EXECUTE :

a->ac_exec = o->o_str;

c = *o->o_str;

if (c== '"'|| c == '\'') {

if (o->o_str[strlen(o->o_str) - 1] == c) {

a->ac_run = strdup(o->o_str + 1);

a->ac_run[strlen(a->ac_run) - 1] ='\0';

} else

a->ac_run = o->o_str;

} else

a->ac_run = o->o_str;

o->o_str = NULL;

break;

case IPM_INTERFACE :

a->ac_iface = o->o_str;

o->o_str = NULL;

break;

case IPM_GROUP :

if (o->o_str != NULL)

strncpy(a->ac_group, o->o_str, FR_GROUPLEN);

else

sprintf(a->ac_group, "%d", o->o_num);

break;

case IPM_PACKET :

a->ac_packet = o->o_num;

break;

case IPM_PROTOCOL :

a->ac_proto = o->o_num;

break;

case IPM_RULE :

a->ac_rule = o->o_num;

break;

case IPM_RESULT :

if (!strcasecmp(o->o_str, "pass"))

a->ac_result = IPMR_PASS;

else if (!strcasecmp(o->o_str, "block"))

a->ac_result = IPMR_BLOCK;

else if (!strcasecmp(o->o_str, "short"))

a->ac_result = IPMR_SHORT;

else if (!strcasecmp(o->o_str, "nomatch"))

a->ac_result = IPMR_NOMATCH;

else if (!strcasecmp(o->o_str, "log"))

a->ac_result = IPMR_LOG;

break;

case IPM_SECOND :

a->ac_second = o->o_num;

break;

case IPM_SRCIP :

a->ac_sip = o->o_ip.s_addr;

for (i = o->o_num, m = 0; i; i--) {

m >>= 1;

m |= 0x80000000;

}

a->ac_smsk = htonl(m);

break;

case IPM_SRCPORT :

a->ac_sport = htons(o->o_num);

break;

case IPM_TAG :

a->ac_tag = o->o_num;

break;

default :

break;

}

olist = o->o_next;

if (o->o_str != NULL)

free(o->o_str);

free(o);

}

a->a_next = alist;

alist = a;

}

void check_action(buf, opts, log)

char *buf;

int opts;

char *log;

{

struct timeval tv;

ipflog_t *ipf;

tcphdr_t *tcp;

iplog_t *ipl;

action_t *a;

u_long t1;

ip_t *ip;

ipl = (iplog_t *)buf;

ipf = (ipflog_t *)(ipl +1);

ip = (ip_t *)(ipf + 1);

tcp = (tcphdr_t *)((char *)ip + (IP_HL(ip) << 2));

for (a = alist; a; a = a->a_next) {

if (a->ac_mflag & IPMAC_DIRECTION) {

if (a->ac_direction == IPM_IN) {

if (!(ipf->fl_flags & FR_INQUE))

continue;

} else if (a->ac_direction == IPM_OUT) {

if (!(ipf->fl_flags & FR_OUTQUE))

continue;

}

}

if (a->ac_mflag & IPMAC_EVERY) {

gettimeofday(&tv, NULL);

t1 = tv.tv_sec - a->ac_lastsec;

if (tv.tv_usec <= a->ac_lastusec)

t1--;

if (a->ac_second) {

if (t1 < a->ac_second)

continue;

a->ac_lastsec = tv.tv_sec;

a->ac_lastusec = tv.tv_usec;

}

if (a->ac_packet) {

if (!a->ac_pktcnt)

a->ac_pktcnt++;

else if (a->ac_pktcnt == a->ac_packet) {

a->ac_pktcnt = 0;

continue;

} else {

a->ac_pktcnt++;

continue;

}

}

}

if (a->ac_mflag & IPMAC_DSTIP) {

if ((ip->ip_dst.s_addr & a->ac_dmsk) != a->ac_dip)

continue;

}

if (a->ac_mflag & IPMAC_DSTPORT) {

if (ip->ip_p != IPPROTO_UDP && ip->ip_p != IPPROTO_TCP)

continue;

if (tcp->th_dport != a->ac_dport)

continue;

}

if (a->ac_mflag & IPMAC_GROUP) {

if (strncmp(a->ac_group, ipf->fl_group,

FR_GROUPLEN) != 0)

continue;

}

if (a->ac_mflag & IPMAC_INTERFACE) {

if (strcmp(a->ac_iface, ipf->fl_ifname))

continue;

}

if (a->ac_mflag & IPMAC_PROTOCOL) {

if (a->ac_proto != ip->ip_p)

continue;

}

if (a->ac_mflag & IPMAC_RESULT) {

if (ipf->fl_lflags & FI_SHORT) {

if (a->ac_result != IPMR_SHORT)

continue;

} else if (FR_ISPASS(ipf->fl_flags)) {

if (a->ac_result != IPMR_PASS)

continue;

} else if (FR_ISBLOCK(ipf->fl_flags)) {

if (a->ac_result != IPMR_BLOCK)

continue;

} else if (ipf->fl_flags & FF_LOGNOMATCH) {

if (a->ac_result != IPMR_NOMATCH)

continue;

} else { /* Log only */

if (a->ac_result != IPMR_LOG)

continue;

}

}

if (a->ac_mflag & IPMAC_RULE) {

if (a->ac_rule != ipf->fl_rule)

continue;

}

if (a->ac_mflag & IPMAC_SRCIP) {

if ((ip->ip_src.s_addr & a->ac_smsk) != a->ac_sip)

continue;

}

if (a->ac_mflag & IPMAC_SRCPORT) {

if (ip->ip_p != IPPROTO_UDP && ip->ip_p != IPPROTO_TCP)

continue;

if (tcp->th_sport != a->ac_sport)

continue;

}

if (a->ac_mflag & IPMAC_TAG) {

if (a->ac_tag != ipf->fl_tag)

continue;

}

/*

if (a->ac_exec) {

switch (fork())

{

case 0 :

{

FILE *pi;

pi = popen(a->ac_run, "w");

if (pi) {

fprintf(pi, "%s\n", log);

if (opts & OPT_HEXHDR) {

dumphex(pi, 0, buf,

sizeof(*ipl) +

sizeof(*ipf));

}

if (opts & OPT_HEXBODY) {

dumphex(pi, 0, (char *)ip,

ipf->fl_hlen +

ipf->fl_plen);

}

pclose(pi);

}

exit(1);

}

case -1 :

break;

default :

break;

}

}

}

}

int load_config(file)

char *file;

{

FILE *fp;

yylineNum = 0;

(void) yysettab(yywords);

fp = fopen(file, "r");

if (!fp) {

perror("load_config:fopen:");

return -1;

}

yyin = fp;

while (!feof(fp))

yyparse();

fclose(fp);

return 0;

}