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freebsd-skq/usr.sbin/rrenumd/parser.y
cem 4ea65ca6dd rrenumd(8): Fix a trivial Coverity warning 
Coverity warns that it is invalid to access following struct members by
accessing the current struct member pointer plus one.  Assuming the
compilers aren't abusing this kind of UB yet, this cleanup isn't a
functional change.

Reported by:	Coverity
CID:		1368713
Sponsored by:	Dell EMC Isilon
2017-03-29 21:04:39 +00:00

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/* $KAME: parser.y,v 1.8 2000/11/08 03:03:34 jinmei Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
%{
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/queue.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/icmp6.h>
#include <limits.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
#include "rrenumd.h"
struct config_is_set {
u_short cis_dest : 1;
} cis;
struct dst_list *dl_head;
struct payload_list *pl_head, ple_cur;
u_int retry;
char errbuf[LINE_MAX];
extern int lineno;
extern void yyerror(const char *s);
extern int yylex(void);
static struct payload_list * pllist_lookup(int seqnum);
static void pllist_enqueue(struct payload_list *pl_entry);
#define MAX_RETRYNUM 10 /* upper limit of retry in this rrenumd program */
#define MAX_SEQNUM 256 /* upper limit of seqnum in this rrenumd program */
#define NOSPEC -1
%}
%union {
u_long num;
struct {
char *cp;
int len;
} cs;
struct in_addr addr4;
struct in6_addr addr6;
struct {
struct in6_addr addr;
u_char plen;
} prefix;
struct dst_list *dl;
struct payload_list *pl;
struct sockaddr *sa;
}
%token <num> ADD CHANGE SETGLOBAL
%token DEBUG_CMD DEST_CMD RETRY_CMD SEQNUM_CMD
%token MATCH_PREFIX_CMD MAXLEN_CMD MINLEN_CMD
%token USE_PREFIX_CMD KEEPLEN_CMD
%token VLTIME_CMD PLTIME_CMD
%token RAF_ONLINK_CMD RAF_AUTO_CMD RAF_DECRVALID_CMD RAF_DECRPREFD_CMD
%token <num> DAYS HOURS MINUTES SECONDS INFINITY
%token <num> ON OFF
%token BCL ECL EOS ERROR
%token <cs> NAME HOSTNAME QSTRING DECSTRING
%token <addr4> IPV4ADDR
%token <addr6> IPV6ADDR
%token <num> PREFIXLEN
%type <num> retrynum seqnum rrenum_cmd
%type <num> prefixlen maxlen minlen keeplen vltime pltime
%type <num> lifetime days hours minutes seconds
%type <num> decstring
%type <num> raf_onlink raf_auto raf_decrvalid raf_decrprefd flag
%type <dl> dest_addrs dest_addr sin sin6
%type <pl> rrenum_statement
%type <cs> ifname
%type <prefix> prefixval
%%
config:
/* empty */
| statements
;
statements:
statement
| statements statement
;
statement:
debug_statement
| destination_statement
| rrenum_statement_without_seqnum
| rrenum_statement_with_seqnum
| error EOS
{
yyerrok;
}
| EOS
;
debug_statement:
DEBUG_CMD flag EOS
{
#ifdef YYDEBUG
yydebug = $2;
#endif /* YYDEBUG */
}
;
destination_statement:
DEST_CMD dest_addrs retrynum EOS
{
dl_head = $2;
retry = $3;
}
;
dest_addrs:
dest_addr
| dest_addrs dest_addr
{
$2->dl_next = $1;
$$ = $2;
}
;
dest_addr :
sin
{
with_v4dest = 1;
}
| sin6
{
with_v6dest = 1;
}
| sin6 ifname
{
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)$1->dl_dst;
sin6->sin6_scope_id = if_nametoindex($2.cp);
with_v6dest = 1;
$$ = $1;
}
| HOSTNAME
{
struct sockaddr_storage *ss;
struct addrinfo hints, *res;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_RAW;
hints.ai_protocol = 0;
error = getaddrinfo($1.cp, 0, &hints, &res);
if (error) {
snprintf(errbuf, sizeof(errbuf),
"name resolution failed for %s:%s",
$1.cp, gai_strerror(error));
yyerror(errbuf);
}
ss = (struct sockaddr_storage *)malloc(sizeof(*ss));
memset(ss, 0, sizeof(*ss));
memcpy(ss, res->ai_addr, res->ai_addr->sa_len);
freeaddrinfo(res);
$$ = (struct dst_list *)
malloc(sizeof(struct dst_list));
memset($$, 0, sizeof(struct dst_list));
$$->dl_dst = (struct sockaddr *)ss;
}
;
sin:
IPV4ADDR
{
struct sockaddr_in *sin;
sin = (struct sockaddr_in *)malloc(sizeof(*sin));
memset(sin, 0, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr = $1;
$$ = (struct dst_list *)
malloc(sizeof(struct dst_list));
memset($$, 0, sizeof(struct dst_list));
$$->dl_dst = (struct sockaddr *)sin;
}
;
sin6:
IPV6ADDR
{
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)malloc(sizeof(*sin6));
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = $1;
$$ = (struct dst_list *)
malloc(sizeof(struct dst_list));
memset($$, 0, sizeof(struct dst_list));
$$->dl_dst = (struct sockaddr *)sin6;
}
ifname:
NAME
{
$$.cp = strdup($1.cp);
$$.len = $1.len;
}
| QSTRING
{
$1.cp[$1.len - 1] = 0;
$$.cp = strdup(&$1.cp[1]);
$$.len = $1.len - 2;
}
;
retrynum:
/* empty */
{
$$ = 2;
}
| RETRY_CMD decstring
{
if ($2 > MAX_RETRYNUM)
$2 = MAX_RETRYNUM;
$$ = $2;
}
;
rrenum_statement_with_seqnum:
SEQNUM_CMD seqnum
{
if (pllist_lookup($2)) {
snprintf(errbuf, sizeof(errbuf),
"duplicate seqnum %ld specified at %d",
$2, lineno);
yyerror(errbuf);
}
}
BCL rrenum_statement EOS ECL EOS
{
$5->pl_irr.rr_seqnum = $2;
pllist_enqueue($5);
}
;
seqnum:
/* empty */
{
$$ = 0;
}
| decstring
{
if ($1 > MAX_SEQNUM) {
snprintf(errbuf, sizeof(errbuf),
"seqnum %ld is illegal for this program. "
"should be between 0 and %d",
$1, MAX_SEQNUM);
yyerror(errbuf);
}
$$ = $1;
}
;
rrenum_statement_without_seqnum:
rrenum_statement EOS
{
if (pllist_lookup(0)) {
snprintf(errbuf, sizeof(errbuf),
"duplicate seqnum %d specified at %d",
0, lineno);
yyerror(errbuf);
}
$1->pl_irr.rr_seqnum = 0;
pllist_enqueue($1);
}
;
rrenum_statement:
match_prefix_definition use_prefix_definition
{
$$ = (struct payload_list *)
malloc(sizeof(struct payload_list));
memcpy($$, &ple_cur, sizeof(ple_cur));
}
;
match_prefix_definition:
rrenum_cmd MATCH_PREFIX_CMD prefixval maxlen minlen
{
struct icmp6_router_renum *irr;
struct rr_pco_match *rpm;
irr = &ple_cur.pl_irr;
rpm = &ple_cur.pl_rpm;
memset(rpm, 0, sizeof(*rpm));
rpm->rpm_code = $1;
rpm->rpm_prefix = $3.addr;
rpm->rpm_matchlen = $3.plen;
rpm->rpm_maxlen = $4;
rpm->rpm_minlen = $5;
}
;
rrenum_cmd:
/* empty */
{
$$ = RPM_PCO_ADD;
}
| ADD
| CHANGE
| SETGLOBAL
;
prefixval:
IPV6ADDR prefixlen
{
$$.addr = $1;
$$.plen = $2;
}
;
prefixlen:
/* empty */
{
$$ = 64;
}
| PREFIXLEN
;
maxlen:
/* empty */
{
$$ = 128;
}
| MAXLEN_CMD decstring
{
if ($2 > 128)
$2 = 128;
$$ = $2;
}
;
minlen:
/* empty */
{
$$ = 0;
}
| MINLEN_CMD decstring
{
if ($2 > 128)
$2 = 128;
$$ = $2;
}
;
use_prefix_definition:
/* empty */
{
struct icmp6_router_renum *irr;
struct rr_pco_match *rpm;
struct rr_pco_use *rpu;
irr = (struct icmp6_router_renum *)&ple_cur.pl_irr;
rpm = (struct rr_pco_match *)(irr + 1);
rpu = (struct rr_pco_use *)(rpm + 1);
memset(rpu, 0, sizeof(*rpu));
}
| USE_PREFIX_CMD prefixval keeplen use_prefix_values
{
struct icmp6_router_renum *irr;
struct rr_pco_match *rpm;
struct rr_pco_use *rpu;
irr = (struct icmp6_router_renum *)&ple_cur.pl_irr;
rpm = (struct rr_pco_match *)(irr + 1);
rpu = (struct rr_pco_use *)(rpm + 1);
rpu->rpu_prefix = $2.addr;
rpu->rpu_uselen = $2.plen;
rpu->rpu_keeplen = $3;
}
;
use_prefix_values:
/* empty */
{
struct icmp6_router_renum *irr;
struct rr_pco_match *rpm;
struct rr_pco_use *rpu;
irr = (struct icmp6_router_renum *)&ple_cur.pl_irr;
rpm = (struct rr_pco_match *)(irr + 1);
rpu = (struct rr_pco_use *)(rpm + 1);
memset(rpu, 0, sizeof(*rpu));
rpu->rpu_vltime = htonl(DEF_VLTIME);
rpu->rpu_pltime = htonl(DEF_PLTIME);
rpu->rpu_ramask = 0;
rpu->rpu_flags = 0;
}
| BCL vltime pltime raf_onlink raf_auto raf_decrvalid raf_decrprefd ECL
{
struct icmp6_router_renum *irr;
struct rr_pco_match *rpm;
struct rr_pco_use *rpu;
irr = (struct icmp6_router_renum *)&ple_cur.pl_irr;
rpm = (struct rr_pco_match *)(irr + 1);
rpu = (struct rr_pco_use *)(rpm + 1);
memset(rpu, 0, sizeof(*rpu));
rpu->rpu_vltime = $2;
rpu->rpu_pltime = $3;
if ($4 == NOSPEC) {
rpu->rpu_ramask &=
~ICMP6_RR_PCOUSE_RAFLAGS_ONLINK;
} else {
rpu->rpu_ramask |=
ICMP6_RR_PCOUSE_RAFLAGS_ONLINK;
if ($4 == ON) {
rpu->rpu_raflags |=
ICMP6_RR_PCOUSE_RAFLAGS_ONLINK;
} else {
rpu->rpu_raflags &=
~ICMP6_RR_PCOUSE_RAFLAGS_ONLINK;
}
}
if ($5 == NOSPEC) {
rpu->rpu_ramask &=
ICMP6_RR_PCOUSE_RAFLAGS_AUTO;
} else {
rpu->rpu_ramask |=
ICMP6_RR_PCOUSE_RAFLAGS_AUTO;
if ($5 == ON) {
rpu->rpu_raflags |=
ICMP6_RR_PCOUSE_RAFLAGS_AUTO;
} else {
rpu->rpu_raflags &=
~ICMP6_RR_PCOUSE_RAFLAGS_AUTO;
}
}
rpu->rpu_flags = 0;
if ($6 == ON) {
rpu->rpu_flags |=
ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME;
}
if ($7 == ON) {
rpu->rpu_flags |=
ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME;
}
}
;
keeplen:
/* empty */
{
$$ = 0;
}
| KEEPLEN_CMD decstring
{
if ($2 > 128)
$2 = 128;
$$ = $2;
}
;
vltime:
/* empty */
{
$$ = htonl(DEF_VLTIME);
}
| VLTIME_CMD lifetime
{
$$ = htonl($2);
}
;
pltime:
/* empty */
{
$$ = htonl(DEF_PLTIME);
}
| PLTIME_CMD lifetime
{
$$ = htonl($2);
}
raf_onlink:
/* empty */
{
$$ = NOSPEC;
}
| RAF_ONLINK_CMD flag
{
$$ = $2;
}
;
raf_auto:
/* empty */
{
$$ = NOSPEC;
}
| RAF_AUTO_CMD flag
{
$$ = $2;
}
;
raf_decrvalid:
/* empty */
{
$$ = NOSPEC;
}
| RAF_DECRVALID_CMD flag
{
$$ = $2;
}
;
raf_decrprefd:
/* empty */
{
$$ = NOSPEC;
}
| RAF_DECRPREFD_CMD flag
{
$$ = $2;
}
;
flag:
ON { $$ = ON; }
| OFF { $$ = OFF; }
;
lifetime:
decstring
| INFINITY
{
$$ = 0xffffffff;
}
| days hours minutes seconds
{
int d, h, m, s;
d = $1 * 24 * 60 * 60;
h = $2 * 60 * 60;
m = $3 * 60;
s = $4;
$$ = d + h + m + s;
}
;
days:
/* empty */
{
$$ = 0;
}
| DAYS
;
hours:
/* empty */
{
$$ = 0;
}
| HOURS
;
minutes:
/* empty */
{
$$ = 0;
}
| MINUTES
;
seconds:
/* empty */
{
$$ = 0;
}
| SECONDS
;
decstring:
DECSTRING
{
int dval;
dval = atoi($1.cp);
$$ = dval;
}
;
%%
static struct payload_list *
pllist_lookup(int seqnum)
{
struct payload_list *pl;
for (pl = pl_head; pl && pl->pl_irr.rr_seqnum != seqnum;
pl = pl->pl_next)
continue;
return (pl);
}
static void
pllist_enqueue(struct payload_list *pl_entry)
{
struct payload_list *pl, *pl_last;
pl_last = NULL;
for (pl = pl_head;
pl && pl->pl_irr.rr_seqnum < pl_entry->pl_irr.rr_seqnum;
pl_last = pl, pl = pl->pl_next)
continue;
if (pl_last)
pl_last->pl_next = pl_entry;
else
pl_head = pl_entry;
return;
}
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