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parse.y
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parse.y
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/* $Id: parse.y,v 1.36 2007/10/24 01:04:10 djm Exp $ */
/*
* Copyright (c) 2004,2005 Damien Miller <djm@mindrot.org>
* Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2001 Daniel Hartmeier. All rights reserved.
* Copyright (c) 2001 Theo de Raadt. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
%{
#include "flowd-common.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <stdarg.h>
#include <syslog.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "flowd.h"
#include "addr.h"
static struct flowd_config *conf = NULL;
static FILE *fin = NULL;
static int lineno = 1;
static int errors = 0;
static int pdebug = 1;
const char *infile;
int yyerror(const char *, ...);
int yyparse(void);
int kw_cmp(const void *, const void *);
int lookup(char *);
int lgetc(FILE *);
int lungetc(int);
int findeol(void);
int yylex(void);
int atoul(char *, u_long *);
int parse_abstime(const char *s, struct tm *tp);
TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
struct sym {
TAILQ_ENTRY(sym) entry;
int used;
int persist;
char *nam;
char *val;
};
int symset(const char *, const char *, int);
char *symget(const char *);
typedef struct {
union {
u_int32_t number;
char *string;
u_int8_t u8;
struct xaddr addr;
struct {
struct xaddr addr;
unsigned int len;
} prefix;
struct {
struct xaddr addr;
u_int16_t port;
} addrport;
struct filter_action filter_action;
struct filter_match filter_match;
} v;
int lineno;
} YYSTYPE;
static const char *days[7] = {
"sun", "mon", "tue", "wed", "thu", "fri", "sat"
};
static const char *longdays[7] = {
"sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"
};
%}
%token LISTEN ON JOIN GROUP LOGFILE LOGSOCK BUFSIZE STORE PIDFILE FLOW SOURCE
%token ALL TAG ACCEPT DISCARD QUICK AGENT SRC DST PORT PROTO TOS ANY
%token TCP_FLAGS EQUALS MASK INET INET6 DAYS AFTER BEFORE DATE
%token IN_IFNDX OUT_IFNDX
%token ERROR
%token <v.string> STRING
%type <v.number> number quick logspec not octet tcp_flags tcp_mask af dayname dayrange daylist dayspec daytime abstime
%type <v.string> string
%type <v.addr> address
%type <v.addrport> address_port
%type <v.prefix> prefix prefix_or_any
%type <v.filter_match> match_agent match_src match_dst match_proto match_tos match_tcp_flags match_af match_day match_after match_before match_dayafter match_daybefore match_absafter match_absbefore match_if_in match_if_out
%type <v.filter_action> action tag
%%
grammar : /* empty */
| grammar '\n'
| grammar conf_main '\n'
| grammar varset '\n'
| grammar filterrule '\n'
| grammar error '\n' { errors++; }
;
number : STRING {
u_long ulval;
if (atoul($1, &ulval) == -1) {
yyerror("\"%s\" is not a number", $1);
free($1);
YYERROR;
} else
$$ = ulval;
free($1);
}
;
octet : number {
$$ = $1;
if ($$ > 0xff) {
yyerror("octet value exceeds 0xff");
YYERROR;
}
}
;
string : string STRING {
char buf[2048];
snprintf(buf, sizeof(buf), "%s %s", $1, $2);
if (($$ = strdup(buf)) == NULL)
logerrx("string: strdup");
free($1);
free($2);
}
| STRING
;
varset : STRING '=' string {
if (conf->opts & FLOWD_OPT_VERBOSE)
logit(LOG_DEBUG, "%s = \"%s\"", $1, $3);
if (symset($1, $3, 0) == -1)
logerrx("cannot store variable");
free($1);
free($3);
}
;
/*
* Unfortunately, we can't let yacc do the host:port colon splitting for us,
* because it breaks IPv6 addresses
*/
address_port : STRING {
char *colon, *cp;
unsigned long port;
cp = $1;
if ((colon = strrchr(cp, ':')) == NULL) {
yyerror("missing port specification \"%s\"", $1);
free($1);
YYERROR;
}
*colon++ = '\0';
/* Allow [blah]:foo for IPv6 */
if (*cp == '[' && *(colon - 2) == ']') {
cp++;
*(colon - 2) = '\0';
}
if (atoul(colon, &port) == -1 || port == 0 ||
port > 65535) {
yyerror("Invalid port number");
free($1);
YYERROR;
}
if (addr_pton(cp, &$$.addr) == -1) {
yyerror("could not parse address \"%s\"", cp);
free($1);
YYERROR;
}
$$.port = port;
free($1);
}
;
address : STRING {
char *cp;
size_t len;
cp = $1;
len = strlen(cp);
/* Allow [blah]:foo for IPv6 */
if (cp[0] == '[' && cp[len - 1] == ']') {
cp++;
cp[len - 1] = '\0';
}
if (addr_pton(cp, &$$) == -1) {
yyerror("could not parse address \"%s\"", cp);
free($1);
YYERROR;
}
free($1);
}
;
prefix : STRING '/' number {
char *s, *cp, buf[2048];
int len;
/* Allow [blah]:foo for IPv6 */
cp = $1;
len = strlen(cp);
if (*cp == '[' && cp[len - 1] == ']') {
cp[len - 1] = '\0';
cp++;
}
snprintf(buf, sizeof(buf), "%s/%u", cp, $3);
if ((s = strdup(buf)) == NULL)
logerrx("string: strdup");
free($1);
if (addr_pton_cidr(s, &$$.addr, &$$.len) == -1) {
yyerror("could not parse address \"%s\"", s);
free(s);
YYERROR;
}
if (addr_host_is_all0s(&$$.addr, $$.len) != 0) {
yyerror("invalid address/masklength \"%s\"", s);
free(s);
YYERROR;
}
free(s);
}
| STRING {
char *cp;
int len;
/* Allow [blah]:foo for IPv6 */
cp = $1;
len = strlen(cp);
if (*cp == '[' && cp[len - 1] == ']') {
cp[len - 1] = '\0';
cp++;
}
if (addr_pton_cidr(cp, &$$.addr, &$$.len) == -1) {
yyerror("could not parse address \"%s\"", cp);
free($1);
YYERROR;
}
free($1);
}
;
prefix_or_any : ANY { memset(&$$, 0, sizeof($$)); }
| prefix { $$ = $1; }
;
not : '!' { $$ = 1; }
| /* empty */ { $$ = 0; }
;
dayname : STRING {
int i;
for (i = 0; i < 7; i++) {
if (strcasecmp($1, days[i]) == 0 ||
strcasecmp($1, longdays[i]) == 0) {
$$ = i;
break;
}
}
if (i >= 7) {
yyerror("invalid day of week \"%s\"", $1);
free($1);
YYERROR;
}
free($1);
}
;
dayrange : dayname '-' dayname {
int i, start, finish;
start = $1;
finish = $3;
if (finish < start)
finish += 7;
$$ = 0;
for (i = start; i <= finish; i++)
$$ |= (1 << (i % 7));
}
daylist : dayname ',' dayname { $$ = (1 << $1) | (1 << $3); }
| daylist ',' dayname { $$ = $1 | (1 << $3); }
dayspec : dayname { $$ = (1 << $1); }
| daylist { $$ = $1; }
| dayrange { $$ = $1; }
daytime : STRING {
int h, m, s, n;
n = sscanf($1, "%d:%d:%d", &h, &m, &s);
if (n < 2) {
yyerror("invalid time spec \"%s\"", $1);
free($1);
YYERROR;
}
if (n < 3)
s = 0;
if (h < 0 || h > 23 ||
m < 0 || m > 59 ||
s < 0 || s > 59) {
yyerror("invalid time of day \"%s\"", $1);
free($1);
YYERROR;
}
free($1);
$$ = s + (m * 60) + (h * 3600);
}
;
abstime : STRING {
time_t t;
struct tm tm;
$$ = 0;
if (parse_abstime($1, &tm) != 0 ||
(t = mktime(&tm)) < 0) {
yyerror("invalid time spec \"%s\"", $1);
free($1);
YYERROR;
}
$$ = t;
free($1);
}
;
conf_main : LISTEN ON address_port {
struct listen_addr *la;
if ((la = calloc(1, sizeof(*la))) == NULL)
logerrx("listen_on: calloc");
la->fd = -1;
la->addr = $3.addr;
la->port = $3.port;
la->bufsiz = 0;
TAILQ_INSERT_TAIL(&conf->listen_addrs, la, entry);
}
| LISTEN ON address_port BUFSIZE number {
struct listen_addr *la;
if ((la = calloc(1, sizeof(*la))) == NULL)
logerrx("listen_on: calloc");
la->fd = -1;
la->addr = $3.addr;
la->port = $3.port;
la->bufsiz = $5;
TAILQ_INSERT_TAIL(&conf->listen_addrs, la, entry);
}
| FLOW SOURCE prefix_or_any {
struct allowed_device *ad;
if ((ad = calloc(1, sizeof(*ad))) == NULL)
logerrx("flow_source: calloc");
memcpy(&ad->addr, &$3.addr, sizeof(ad->addr));
ad->masklen = $3.len;
TAILQ_INSERT_TAIL(&conf->allowed_devices, ad, entry);
}
| JOIN GROUP address {
struct join_group *jg;
if ((jg = calloc(1, sizeof(*jg))) == NULL)
logerrx("join_group: calloc");
memcpy(&jg->addr, &$3, sizeof(jg->addr));
TAILQ_INSERT_TAIL(&conf->join_groups, jg, entry);
}
| LOGFILE string {
conf->log_file = $2;
}
| LOGSOCK string {
conf->log_socket = $2;
}
| LOGSOCK string BUFSIZE number {
conf->log_socket = $2;
conf->log_socket_bufsiz = $4;
}
| PIDFILE string {
conf->pid_file = $2;
}
| STORE logspec { conf->store_mask |= $2; }
;
logspec : STRING {
if (strcasecmp($1, "ALL") == 0)
$$ = STORE_FIELD_ALL;
else if (strcasecmp($1, "TAG") == 0)
$$ = STORE_FIELD_TAG;
else if (strcasecmp($1, "RECV_TIME") == 0)
$$ = STORE_FIELD_RECV_TIME;
else if (strcasecmp($1, "PROTO_FLAGS_TOS") == 0)
$$ = STORE_FIELD_PROTO_FLAGS_TOS;
else if (strcasecmp($1, "AGENT_ADDR") == 0)
$$ = STORE_FIELD_AGENT_ADDR;
else if (strcasecmp($1, "AGENT_ADDR4") == 0)
$$ = STORE_FIELD_AGENT_ADDR4;
else if (strcasecmp($1, "AGENT_ADDR6") == 0)
$$ = STORE_FIELD_AGENT_ADDR6;
else if (strcasecmp($1, "SRCDST_ADDR") == 0)
$$ = STORE_FIELD_SRCDST_ADDR;
else if (strcasecmp($1, "SRC_ADDR") == 0)
$$ = STORE_FIELD_SRC_ADDR;
else if (strcasecmp($1, "SRC_ADDR4") == 0)
$$ = STORE_FIELD_SRC_ADDR4;
else if (strcasecmp($1, "DST_ADDR") == 0)
$$ = STORE_FIELD_DST_ADDR;
else if (strcasecmp($1, "DST_ADDR4") == 0)
$$ = STORE_FIELD_DST_ADDR4;
else if (strcasecmp($1, "SRC_ADDR6") == 0)
$$ = STORE_FIELD_SRC_ADDR6;
else if (strcasecmp($1, "DST_ADDR6") == 0)
$$ = STORE_FIELD_DST_ADDR6;
else if (strcasecmp($1, "GATEWAY_ADDR") == 0)
$$ = STORE_FIELD_GATEWAY_ADDR;
else if (strcasecmp($1, "GATEWAY_ADDR4") == 0)
$$ = STORE_FIELD_GATEWAY_ADDR4;
else if (strcasecmp($1, "GATEWAY_ADDR6") == 0)
$$ = STORE_FIELD_GATEWAY_ADDR6;
else if (strcasecmp($1, "SRCDST_PORT") == 0)
$$ = STORE_FIELD_SRCDST_PORT;
else if (strcasecmp($1, "PACKETS") == 0)
$$ = STORE_FIELD_PACKETS;
else if (strcasecmp($1, "OCTETS") == 0)
$$ = STORE_FIELD_OCTETS;
else if (strcasecmp($1, "IF_INDICES") == 0)
$$ = STORE_FIELD_IF_INDICES;
else if (strcasecmp($1, "AGENT_INFO") == 0)
$$ = STORE_FIELD_AGENT_INFO;
else if (strcasecmp($1, "FLOW_TIMES") == 0)
$$ = STORE_FIELD_FLOW_TIMES;
else if (strcasecmp($1, "AS_INFO") == 0)
$$ = STORE_FIELD_AS_INFO;
else if (strcasecmp($1, "FLOW_ENGINE_INFO") == 0)
$$ = STORE_FIELD_FLOW_ENGINE_INFO;
else if (strcasecmp($1, "CRC32") == 0)
$$ = STORE_FIELD_CRC32;
else {
yyerror("unknown store field type \"%s\"", $1);
free($1);
YYERROR;
}
free($1);
}
filterrule : action tag quick match_agent match_if_in match_if_out match_af match_src match_dst match_proto match_tos match_tcp_flags match_day match_after match_before
{
struct filter_rule *r;
if ((r = calloc(1, sizeof(*r))) == NULL)
logerrx("filterrule: calloc");
r->action = $1;
if ($2.action_what == FF_ACTION_TAG) {
if (r->action.action_what != FF_ACTION_ACCEPT) {
yyerror("tag not allowed in discard");
free(r);
YYERROR;
}
r->action = $2;
}
r->quick = $3;
r->match.agent_addr = $4.agent_addr;
r->match.agent_masklen = $4.agent_masklen;
r->match.match_what |= $4.match_what;
r->match.match_negate |= $4.match_negate;
r->match.ifndx_in = $5.ifndx_in;
r->match.match_what |= $5.match_what;
r->match.match_negate |= $5.match_negate;
r->match.ifndx_out = $6.ifndx_out;
r->match.match_what |= $6.match_what;
r->match.match_negate |= $6.match_negate;
r->match.af = $7.af;
r->match.match_what |= $7.match_what;
r->match.match_negate |= $7.match_negate;
r->match.src_addr = $8.src_addr;
r->match.src_masklen = $8.src_masklen;
r->match.src_port = $8.src_port;
r->match.match_what |= $8.match_what;
r->match.match_negate |= $8.match_negate;
r->match.dst_addr = $9.dst_addr;
r->match.dst_masklen = $9.dst_masklen;
r->match.dst_port = $9.dst_port;
r->match.match_what |= $9.match_what;
r->match.match_negate |= $9.match_negate;
r->match.proto = $10.proto;
r->match.match_what |= $10.match_what;
r->match.match_negate |= $10.match_negate;
r->match.tos = $11.tos;
r->match.match_what |= $11.match_what;
r->match.match_negate |= $11.match_negate;
r->match.tcp_flags_mask = $12.tcp_flags_mask;
r->match.tcp_flags_equals = $12.tcp_flags_equals;
r->match.match_what |= $12.match_what;
r->match.match_negate |= $12.match_negate;
r->match.day_mask = $13.day_mask;
r->match.match_what |= $13.match_what;
r->match.match_negate |= $13.match_negate;
r->match.dayafter = $14.dayafter - 1;
r->match.absafter = $14.absafter;
r->match.match_what |= $14.match_what;
r->match.match_negate |= $14.match_negate;
r->match.daybefore = $15.daybefore - 1;
r->match.absbefore = $15.absbefore;
r->match.match_what |= $15.match_what;
r->match.match_negate |= $15.match_negate;
if ((r->match.match_what & FF_MATCH_DAYTIME) != 0) {
if (r->match.dayafter != 0 &&
r->match.daybefore != 0 &&
r->match.dayafter >= r->match.daybefore) {
yyerror("day start time is after "
"day finish time");
free(r);
YYERROR;
}
}
if ((r->match.match_what & FF_MATCH_ABSTIME) != 0) {
if (r->match.absafter != 0 &&
r->match.absbefore != 0 &&
r->match.absafter >= r->match.absbefore) {
yyerror("date start time is after "
"date finish time");
free(r);
YYERROR;
}
}
if ((r->match.match_what &
(FF_MATCH_SRC_PORT|FF_MATCH_DST_PORT)) &&
(r->match.proto != IPPROTO_TCP &&
r->match.proto != IPPROTO_UDP)) {
yyerror("port matching is only allowed for "
"tcp or udp protocols");
free(r);
YYERROR;
}
if ((r->match.match_what & FF_MATCH_SRC_ADDR) &&
(r->match.match_what & FF_MATCH_DST_ADDR) &&
(r->match.src_addr.af != r->match.dst_addr.af)) {
yyerror("src and dst address families do "
"not match");
free(r);
YYERROR;
}
if ((r->match.match_what & FF_MATCH_AF)) {
if ((r->match.match_what & FF_MATCH_SRC_ADDR) &&
(r->match.af != r->match.src_addr.af)) {
yyerror("Rule address family does not "
"match src address family");
free(r);
YYERROR;
}
if ((r->match.match_what & FF_MATCH_DST_ADDR) &&
(r->match.af != r->match.dst_addr.af)) {
yyerror("Rule address family does not "
"match dst address family");
free(r);
YYERROR;
}
}
if ((r->match.match_what & FF_MATCH_TCP_FLAGS) &&
(r->match.proto != IPPROTO_TCP)) {
yyerror("tcp_flags matching is only allowed "
"for the tcp protocol");
free(r);
YYERROR;
}
TAILQ_INSERT_TAIL(&conf->filter_list, r, entry);
}
| action tag quick ALL
{
struct filter_rule *r;
if ((r = calloc(1, sizeof(*r))) == NULL)
logerrx("filterrule: calloc");
r->action = $1;
if ($2.action_what == FF_ACTION_TAG) {
if (r->action.action_what != FF_ACTION_ACCEPT) {
yyerror("tag not allowed in discard");
free(r);
YYERROR;
}
r->action = $2;
}
r->quick = $3;
TAILQ_INSERT_TAIL(&conf->filter_list, r, entry);
}
;
action : ACCEPT {
bzero(&$$, sizeof($$));
$$.action_what = FF_ACTION_ACCEPT;
}
| DISCARD {
bzero(&$$, sizeof($$));
$$.action_what = FF_ACTION_DISCARD;
}
tag : /* empty */ { bzero(&$$, sizeof($$)); }
| TAG number {
bzero(&$$, sizeof($$));
$$.action_what = FF_ACTION_TAG;
$$.tag = $2;
}
;
quick : /* empty */ { $$ = 0; }
| QUICK { $$ = 1; }
;
match_agent : /* empty */ { bzero(&$$, sizeof($$)); }
| AGENT not prefix {
bzero(&$$, sizeof($$));
memcpy(&$$.agent_addr, &$3.addr, sizeof($$.agent_addr));
$$.agent_masklen = $3.len;
$$.match_what |= FF_MATCH_AGENT_ADDR;
$$.match_negate |= $2 ? FF_MATCH_AGENT_ADDR : 0;
}
;
af : INET { $$ = AF_INET; }
| INET6 { $$ = AF_INET6; }
match_if_in : /* empty */ { bzero(&$$, sizeof($$)); }
| IN_IFNDX not number {
bzero(&$$, sizeof($$));
$$.ifndx_in = $3;
$$.match_what |= FF_MATCH_IFNDX_IN;
$$.match_negate |= $2 ? FF_MATCH_IFNDX_IN : 0;
if ($$.ifndx_in <= 0 || $$.ifndx_in > 65535) {
yyerror("invalid input interface index");
YYERROR;
}
}
;
match_if_out : /* empty */ { bzero(&$$, sizeof($$)); }
| OUT_IFNDX not number {
bzero(&$$, sizeof($$));
$$.ifndx_out = $3;
$$.match_what |= FF_MATCH_IFNDX_OUT;
$$.match_negate |= $2 ? FF_MATCH_IFNDX_OUT : 0;
if ($$.ifndx_out <= 0 || $$.ifndx_out > 65535) {
yyerror("invalid output interface index");
YYERROR;
}
}
;
match_af : /* empty */ { bzero(&$$, sizeof($$)); }
| not af {
bzero(&$$, sizeof($$));
$$.af = $2;
$$.match_what |= FF_MATCH_AF;
$$.match_negate |= $1 ? FF_MATCH_AF : 0;
}
;
match_src : /* empty */ { bzero(&$$, sizeof($$)); }
| SRC not prefix_or_any {
bzero(&$$, sizeof($$));
memcpy(&$$.src_addr, &$3.addr, sizeof($$.src_addr));
$$.src_masklen = $3.len;
$$.match_what |= FF_MATCH_SRC_ADDR;
$$.match_negate |= $2 ? FF_MATCH_SRC_ADDR : 0;
}
| SRC not prefix_or_any PORT not number {
bzero(&$$, sizeof($$));
memcpy(&$$.src_addr, &$3.addr, sizeof($$.src_addr));
$$.src_masklen = $3.len;
$$.src_port = $6;
if ($$.src_port <= 0 || $$.src_port > 65535) {
yyerror("invalid port number");
YYERROR;
}
if ($$.src_addr.af != 0)
$$.match_what |= FF_MATCH_SRC_ADDR;
$$.match_what |= FF_MATCH_SRC_PORT;
$$.match_negate |= $2 ? FF_MATCH_SRC_ADDR : 0;
$$.match_negate |= $5 ? FF_MATCH_SRC_PORT : 0;
}
;
match_dst : /* empty */ { bzero(&$$, sizeof($$)); }
| DST not prefix_or_any {
bzero(&$$, sizeof($$));
memcpy(&$$.dst_addr, &$3.addr, sizeof($$.dst_addr));
$$.dst_masklen = $3.len;
$$.match_what |= FF_MATCH_DST_ADDR;
$$.match_negate |= $2 ? FF_MATCH_DST_ADDR : 0;
}
| DST not prefix_or_any PORT not number {
bzero(&$$, sizeof($$));
memcpy(&$$.dst_addr, &$3.addr, sizeof($$.dst_addr));
$$.dst_masklen = $3.len;
$$.dst_port = $6;
if ($$.dst_port <= 0 || $$.dst_port > 65535) {
yyerror("invalid port number");
YYERROR;
}
if ($$.dst_addr.af != 0)
$$.match_what |= FF_MATCH_DST_ADDR;
$$.match_what |= FF_MATCH_DST_PORT;
$$.match_negate |= $2 ? FF_MATCH_DST_ADDR : 0;
$$.match_negate |= $5 ? FF_MATCH_DST_PORT : 0;
}
;
match_proto : /* empty */ { bzero(&$$, sizeof($$)); }
| PROTO not string {
unsigned long proto;
struct protoent *pe;
bzero(&$$, sizeof($$));
if ((pe = getprotobyname($3)) != NULL)
proto = pe->p_proto;
else {
if (atoul($3, &proto) == -1 || proto == 0 ||
proto > 255) {
yyerror("Invalid protocol");
free($3);
YYERROR;
}
}
free($3);
$$.proto = proto;
$$.match_what |= FF_MATCH_PROTOCOL;
$$.match_negate |= $2 ? FF_MATCH_PROTOCOL : 0;
}
;
match_tos : /* empty */ { bzero(&$$, sizeof($$)); }
| TOS not octet {
bzero(&$$, sizeof($$));
$$.tos = $3;
$$.match_what |= FF_MATCH_TOS;
$$.match_negate |= $2 ? FF_MATCH_TOS : 0;
}
;
tcp_flags : octet { $$ = $1; }
;
tcp_mask : /* empty */ { $$ = 0xff; }
| MASK tcp_flags { $$ = $2; }
;
match_tcp_flags : /* empty */ { bzero(&$$, sizeof($$)); }
| TCP_FLAGS tcp_mask not EQUALS tcp_flags {
bzero(&$$, sizeof($$));
if ($2 > 0xff) {
yyerror("Invalid ToS");
YYERROR;
}
$$.tcp_flags_mask = $2;
$$.tcp_flags_equals = $5;
$$.match_what |= FF_MATCH_TCP_FLAGS;
$$.match_negate |= $3 ? FF_MATCH_TCP_FLAGS : 0;
}
;
match_day : /* empty */ { bzero(&$$, sizeof($$)); }
| DAYS dayspec {
bzero(&$$, sizeof($$));
$$.day_mask = $2;
$$.match_what |= FF_MATCH_DAYTIME;
}
;
match_dayafter : AFTER daytime {
bzero(&$$, sizeof($$));
$$.dayafter = $2 + 1;
$$.match_what |= FF_MATCH_DAYTIME;
}
;
match_daybefore : BEFORE daytime {
bzero(&$$, sizeof($$));
$$.daybefore = $2 + 1;
$$.match_what |= FF_MATCH_DAYTIME;
}
;
match_absafter : AFTER DATE abstime {
bzero(&$$, sizeof($$));
$$.absafter = $3;
$$.match_what |= FF_MATCH_ABSTIME;
}
;
match_absbefore : BEFORE DATE abstime {
bzero(&$$, sizeof($$));
$$.absbefore = $3;
$$.match_what |= FF_MATCH_ABSTIME;
}
;
match_after : /* empty */ { bzero(&$$, sizeof($$)); }
| match_dayafter { $$ = $1; }
| match_absafter { $$ = $1; }
match_before : /* empty */ { bzero(&$$, sizeof($$)); }
| match_daybefore { $$ = $1; }
| match_absbefore { $$ = $1; }
%%
struct keywords {
const char *k_name;
int k_val;
};
int
yyerror(const char *fmt, ...)
{
va_list ap;
char *nfmt, buf[2048];
errors = 1;
va_start(ap, fmt);
snprintf(buf, sizeof(buf), "%s:%d: %s", infile, yylval.lineno, fmt);
if ((nfmt = strdup(buf)) == NULL)
logerrx("yyerror strdup");
vlogit(LOG_ERR, nfmt, ap);
va_end(ap);
free(nfmt);
return (0);
}
int
kw_cmp(const void *k, const void *e)
{
return (strcmp(k, ((const struct keywords *)e)->k_name));
}
int
lookup(char *s)
{
/* this has to be sorted always */
static const struct keywords keywords[] = {
{ "accept", ACCEPT},
{ "after", AFTER},
{ "agent", AGENT},
{ "all", ALL},
{ "any", ANY},
{ "before", BEFORE},
{ "bufsize", BUFSIZE},
{ "date", DATE},
{ "days", DAYS},
{ "discard", DISCARD},
{ "dst", DST},
{ "equals", EQUALS},
{ "flow", FLOW},
{ "group", GROUP},
{ "in_ifndx", IN_IFNDX},
{ "inet", INET},
{ "inet6", INET6},
{ "join", JOIN},
{ "listen", LISTEN},
{ "logfile", LOGFILE},
{ "logsock", LOGSOCK},
{ "mask", MASK},
{ "on", ON},
{ "out_ifndx", OUT_IFNDX},
{ "pidfile", PIDFILE},
{ "port", PORT},
{ "proto", PROTO},
{ "quick", QUICK},
{ "source", SOURCE},
{ "src", SRC},
{ "store", STORE},
{ "tag", TAG},
{ "tcp_flags", TCP_FLAGS},
{ "tos", TOS},
};
const struct keywords *p;
p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
sizeof(keywords[0]), kw_cmp);
if (p) {
if (pdebug > 1)
logit(LOG_DEBUG, "%s: %d", s, p->k_val);
return (p->k_val);
} else {
if (pdebug > 1)
logit(LOG_DEBUG, "string: %s", s);
return (STRING);
}
}
#define MAXPUSHBACK 128
char *parsebuf;
int parseindex;
char pushback_buffer[MAXPUSHBACK];
int pushback_index = 0;
int
lgetc(FILE *f)
{
int c, next;
if (parsebuf) {
/* Read character from the parsebuffer instead of input. */
if (parseindex >= 0) {
c = parsebuf[parseindex++];
if (c != '\0')
return (c);
parsebuf = NULL;
} else
parseindex++;
}
if (pushback_index)
return (pushback_buffer[--pushback_index]);
while ((c = getc(f)) == '\\') {
next = getc(f);
if (next != '\n') {
if (isspace(next))
yyerror("whitespace after \\");
ungetc(next, f);
break;