File: [local] / src / usr.sbin / eigrpd / parse.y (download)
Revision 1.32, Fri Oct 15 15:01:28 2021 UTC (2 years, 7 months ago) by naddy
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, HEAD
Changes since 1.31: +8 -8 lines
Don't declare variables as "unsigned char *" that are passed to
functions that take "char *" arguments. Where such chars are
assigned to int or passed to ctype functions, explicitly cast them
to unsigned char.
For OpenBSD's clang, -Wpointer-sign has been disabled by default,
but when the parse.y code was built elsewhere, the compiler would
complain.
With help from millert@
ok benno@ deraadt@
|
/* $OpenBSD: parse.y,v 1.32 2021/10/15 15:01:28 naddy Exp $ */
/*
* Copyright (c) 2015 Renato Westphal <renato@openbsd.org>
* Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
* Copyright (c) 2004 Ryan McBride <mcbride@openbsd.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 <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <net/route.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <ifaddrs.h>
#include <limits.h>
#include <stdio.h>
#include <syslog.h>
#include <unistd.h>
#include "eigrpd.h"
#include "eigrpe.h"
#include "log.h"
struct file {
TAILQ_ENTRY(file) entry;
FILE *stream;
char *name;
size_t ungetpos;
size_t ungetsize;
u_char *ungetbuf;
int eof_reached;
int lineno;
int errors;
};
TAILQ_HEAD(files, file);
struct sym {
TAILQ_ENTRY(sym) entry;
int used;
int persist;
char *nam;
char *val;
};
TAILQ_HEAD(symhead, sym);
struct config_defaults {
uint8_t kvalues[6];
uint16_t active_timeout;
uint8_t maximum_hops;
uint8_t maximum_paths;
uint8_t variance;
struct redist_metric *dflt_metric;
uint16_t hello_interval;
uint16_t hello_holdtime;
uint32_t delay;
uint32_t bandwidth;
uint8_t splithorizon;
};
typedef struct {
union {
int64_t number;
char *string;
struct redistribute *redist;
struct redist_metric *redist_metric;
} v;
int lineno;
} YYSTYPE;
static int yyerror(const char *, ...)
__attribute__((__format__ (printf, 1, 2)))
__attribute__((__nonnull__ (1)));
static int kw_cmp(const void *, const void *);
static int lookup(char *);
static int igetc(void);
static int lgetc(int);
void lungetc(int);
static int findeol(void);
static int yylex(void);
static int check_file_secrecy(int, const char *);
static struct file *pushfile(const char *, int);
static int popfile(void);
static int yyparse(void);
static int symset(const char *, const char *, int);
static char *symget(const char *);
static struct eigrp *conf_get_instance(uint16_t);
static struct eigrp_iface *conf_get_if(struct kif *);
int conf_check_rdomain(unsigned int);
static void clear_config(struct eigrpd_conf *xconf);
static uint32_t get_rtr_id(void);
static int get_prefix(const char *, union eigrpd_addr *, uint8_t *);
static struct file *file, *topfile;
static struct files files = TAILQ_HEAD_INITIALIZER(files);
static struct symhead symhead = TAILQ_HEAD_INITIALIZER(symhead);
static struct eigrpd_conf *conf;
static int errors;
static int af;
static struct eigrp *eigrp;
static struct eigrp_iface *ei;
static struct config_defaults globaldefs;
static struct config_defaults afdefs;
static struct config_defaults asdefs;
static struct config_defaults ifacedefs;
static struct config_defaults *defs;
%}
%token ROUTERID AS FIBUPDATE RDOMAIN REDISTRIBUTE METRIC DFLTMETRIC
%token MAXHOPS MAXPATHS VARIANCE FIBPRIORITY_INT FIBPRIORITY_EXT
%token FIBPRIORITY_SUMM SUMMARY_ADDR
%token AF IPV4 IPV6 HELLOINTERVAL HOLDTIME KVALUES ACTIVETIMEOUT
%token INTERFACE PASSIVE DELAY BANDWIDTH SPLITHORIZON
%token YES NO
%token INCLUDE
%token ERROR
%token <v.string> STRING
%token <v.number> NUMBER
%type <v.number> yesno no eigrp_af
%type <v.string> string
%type <v.redist> redistribute
%type <v.redist_metric> redist_metric opt_red_metric
%%
grammar : /* empty */
| grammar include '\n'
| grammar '\n'
| grammar conf_main '\n'
| grammar varset '\n'
| grammar af '\n'
| grammar error '\n' { file->errors++; }
;
include : INCLUDE STRING {
struct file *nfile;
if ((nfile = pushfile($2,
!(global.cmd_opts & EIGRPD_OPT_NOACTION))) == NULL) {
yyerror("failed to include file %s", $2);
free($2);
YYERROR;
}
free($2);
file = nfile;
lungetc('\n');
}
;
string : string STRING {
if (asprintf(&$$, "%s %s", $1, $2) == -1) {
free($1);
free($2);
yyerror("string: asprintf");
YYERROR;
}
free($1);
free($2);
}
| STRING
;
optnl : '\n' optnl
|
;
nl : '\n' optnl /* one newline or more */
;
yesno : YES { $$ = 1; }
| NO { $$ = 0; }
;
no : /* empty */ { $$ = 0; }
| NO { $$ = 1; }
;
eigrp_af : IPV4 { $$ = AF_INET; }
| IPV6 { $$ = AF_INET6; }
;
varset : STRING '=' string {
char *s = $1;
if (global.cmd_opts & EIGRPD_OPT_VERBOSE)
printf("%s = \"%s\"\n", $1, $3);
while (*s++) {
if (isspace((unsigned char)*s)) {
yyerror("macro name cannot contain "
"whitespace");
free($1);
free($3);
YYERROR;
}
}
if (symset($1, $3, 0) == -1)
fatal("cannot store variable");
free($1);
free($3);
}
;
conf_main : ROUTERID STRING {
if (!inet_aton($2, &conf->rtr_id)) {
yyerror("error parsing router-id");
free($2);
YYERROR;
}
free($2);
if (bad_addr_v4(conf->rtr_id)) {
yyerror("invalid router-id");
YYERROR;
}
}
| FIBUPDATE yesno {
if ($2 == 0)
conf->flags |= EIGRPD_FLAG_NO_FIB_UPDATE;
else
conf->flags &= ~EIGRPD_FLAG_NO_FIB_UPDATE;
}
| RDOMAIN NUMBER {
if ($2 < 0 || $2 > RT_TABLEID_MAX) {
yyerror("invalid rdomain");
YYERROR;
}
conf->rdomain = $2;
}
| FIBPRIORITY_INT NUMBER {
if ($2 <= RTP_NONE || $2 > RTP_MAX) {
yyerror("invalid fib-priority");
YYERROR;
}
conf->fib_priority_internal = $2;
}
| FIBPRIORITY_EXT NUMBER {
if ($2 <= RTP_NONE || $2 > RTP_MAX) {
yyerror("invalid fib-priority");
YYERROR;
}
conf->fib_priority_external = $2;
}
| FIBPRIORITY_SUMM NUMBER {
if ($2 <= RTP_NONE || $2 > RTP_MAX) {
yyerror("invalid fib-priority");
YYERROR;
}
conf->fib_priority_summary = $2;
}
| defaults
;
af : AF eigrp_af {
af = $2;
afdefs = *defs;
defs = &afdefs;
} af_block {
af = AF_UNSPEC;
defs = &globaldefs;
}
;
af_block : '{' optnl afopts_l '}'
| '{' optnl '}'
|
;
afopts_l : afopts_l afoptsl nl
| afoptsl optnl
;
afoptsl : as
| defaults
;
as : AS NUMBER {
if ($2 < EIGRP_MIN_AS || $2 > EIGRP_MAX_AS) {
yyerror("invalid autonomous-system");
YYERROR;
}
eigrp = conf_get_instance($2);
if (eigrp == NULL)
YYERROR;
asdefs = *defs;
defs = &asdefs;
} as_block {
memcpy(eigrp->kvalues, defs->kvalues,
sizeof(eigrp->kvalues));
eigrp->active_timeout = defs->active_timeout;
eigrp->maximum_hops = defs->maximum_hops;
eigrp->maximum_paths = defs->maximum_paths;
eigrp->variance = defs->variance;
eigrp->dflt_metric = defs->dflt_metric;
eigrp = NULL;
defs = &afdefs;
}
;
as_block : '{' optnl asopts_l '}'
| '{' optnl '}'
|
;
asopts_l : asopts_l asoptsl nl
| asoptsl optnl
;
asoptsl : interface
| redistribute {
SIMPLEQ_INSERT_TAIL(&eigrp->redist_list, $1, entry);
}
| defaults
;
interface : INTERFACE STRING {
struct kif *kif;
if ((kif = kif_findname($2)) == NULL) {
yyerror("unknown interface %s", $2);
free($2);
YYERROR;
}
free($2);
ei = conf_get_if(kif);
if (ei == NULL)
YYERROR;
ifacedefs = *defs;
defs = &ifacedefs;
} interface_block {
ei->hello_holdtime = defs->hello_holdtime;
ei->hello_interval = defs->hello_interval;
ei->delay = defs->delay;
ei->bandwidth = defs->bandwidth;
ei->splithorizon = defs->splithorizon;
ei = NULL;
defs = &asdefs;
}
;
interface_block : '{' optnl interfaceopts_l '}'
| '{' optnl '}'
|
;
interfaceopts_l : interfaceopts_l interfaceoptsl nl
| interfaceoptsl optnl
;
interfaceoptsl : PASSIVE { ei->passive = 1; }
| SUMMARY_ADDR STRING {
struct summary_addr *s, *tmp;
if ((s = calloc(1, sizeof(*s))) == NULL)
fatal(NULL);
if (get_prefix($2, &s->prefix, &s->prefixlen) < 0) {
yyerror("invalid summary-address");
free($2);
free(s);
YYERROR;
}
free($2);
TAILQ_FOREACH(tmp, &ei->summary_list, entry) {
if (eigrp_prefixcmp(af, &s->prefix,
&tmp->prefix, min(s->prefixlen,
tmp->prefixlen)) == 0) {
yyerror("summary-address conflicts "
"with another summary-address "
"already configured");
YYERROR;
}
}
TAILQ_INSERT_TAIL(&ei->summary_list, s, entry);
}
| iface_defaults
;
redistribute : no REDISTRIBUTE STRING opt_red_metric {
struct redistribute *r;
if ((r = calloc(1, sizeof(*r))) == NULL)
fatal(NULL);
if (!strcmp($3, "default"))
r->type = REDIST_DEFAULT;
else if (!strcmp($3, "static"))
r->type = REDIST_STATIC;
else if (!strcmp($3, "rip"))
r->type = REDIST_RIP;
else if (!strcmp($3, "ospf"))
r->type = REDIST_OSPF;
else if (!strcmp($3, "connected"))
r->type = REDIST_CONNECTED;
else if (get_prefix($3, &r->addr, &r->prefixlen) >= 0)
r->type = REDIST_ADDR;
else {
yyerror("invalid redistribute");
free($3);
free(r);
YYERROR;
}
r->af = af;
if ($1)
r->type |= REDIST_NO;
r->metric = $4;
free($3);
$$ = r;
}
;
redist_metric : NUMBER NUMBER NUMBER NUMBER NUMBER {
struct redist_metric *m;
if ($1 < MIN_BANDWIDTH || $1 > MAX_BANDWIDTH) {
yyerror("bandwidth out of range (%d-%d)",
MIN_BANDWIDTH, MAX_BANDWIDTH);
YYERROR;
}
if ($2 < MIN_DELAY || $2 > MAX_DELAY) {
yyerror("delay out of range (%d-%d)",
MIN_DELAY, MAX_DELAY);
YYERROR;
}
if ($3 < MIN_RELIABILITY || $3 > MAX_RELIABILITY) {
yyerror("reliability out of range (%d-%d)",
MIN_RELIABILITY, MAX_RELIABILITY);
YYERROR;
}
if ($4 < MIN_LOAD || $4 > MAX_LOAD) {
yyerror("load out of range (%d-%d)",
MIN_LOAD, MAX_LOAD);
YYERROR;
}
if ($5 < MIN_MTU || $5 > MAX_MTU) {
yyerror("mtu out of range (%d-%d)",
MIN_MTU, MAX_MTU);
YYERROR;
}
if ((m = calloc(1, sizeof(*m))) == NULL)
fatal(NULL);
m->bandwidth = $1;
m->delay = $2;
m->reliability = $3;
m->load = $4;
m->mtu = $5;
$$ = m;
}
;
opt_red_metric : /* empty */ { $$ = NULL; }
| METRIC redist_metric { $$ = $2; }
;
defaults : KVALUES NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER {
if ($2 < MIN_KVALUE || $2 > MAX_KVALUE ||
$3 < MIN_KVALUE || $3 > MAX_KVALUE ||
$4 < MIN_KVALUE || $4 > MAX_KVALUE ||
$5 < MIN_KVALUE || $5 > MAX_KVALUE ||
$6 < MIN_KVALUE || $6 > MAX_KVALUE ||
$7 < MIN_KVALUE || $7 > MAX_KVALUE) {
yyerror("k-value out of range (%d-%d)",
MIN_KVALUE, MAX_KVALUE);
YYERROR;
}
defs->kvalues[0] = $2;
defs->kvalues[1] = $3;
defs->kvalues[2] = $4;
defs->kvalues[3] = $5;
defs->kvalues[4] = $6;
defs->kvalues[5] = $7;
}
| ACTIVETIMEOUT NUMBER {
if ($2 < MIN_ACTIVE_TIMEOUT ||
$2 > MAX_ACTIVE_TIMEOUT) {
yyerror("active-timeout out of range (%d-%d)",
MIN_ACTIVE_TIMEOUT, MAX_ACTIVE_TIMEOUT);
YYERROR;
}
defs->active_timeout = $2;
}
| MAXHOPS NUMBER {
if ($2 < MIN_MAXIMUM_HOPS ||
$2 > MAX_MAXIMUM_HOPS) {
yyerror("maximum-hops out of range (%d-%d)",
MIN_MAXIMUM_HOPS, MAX_MAXIMUM_HOPS);
YYERROR;
}
defs->maximum_hops = $2;
}
| MAXPATHS NUMBER {
if ($2 < MIN_MAXIMUM_PATHS ||
$2 > MAX_MAXIMUM_PATHS) {
yyerror("maximum-paths out of range (%d-%d)",
MIN_MAXIMUM_PATHS, MAX_MAXIMUM_PATHS);
YYERROR;
}
defs->maximum_paths = $2;
}
| VARIANCE NUMBER {
if ($2 < MIN_VARIANCE ||
$2 > MAX_VARIANCE) {
yyerror("variance out of range (%d-%d)",
MIN_VARIANCE, MAX_VARIANCE);
YYERROR;
}
defs->variance = $2;
}
| DFLTMETRIC redist_metric {
defs->dflt_metric = $2;
}
| iface_defaults
;
iface_defaults : HELLOINTERVAL NUMBER {
if ($2 < MIN_HELLO_INTERVAL ||
$2 > MAX_HELLO_INTERVAL) {
yyerror("hello-interval out of range (%d-%d)",
MIN_HELLO_INTERVAL, MAX_HELLO_INTERVAL);
YYERROR;
}
defs->hello_interval = $2;
}
| HOLDTIME NUMBER {
if ($2 < MIN_HELLO_HOLDTIME ||
$2 > MAX_HELLO_HOLDTIME) {
yyerror("hold-timel out of range (%d-%d)",
MIN_HELLO_HOLDTIME,
MAX_HELLO_HOLDTIME);
YYERROR;
}
defs->hello_holdtime = $2;
}
| DELAY NUMBER {
if ($2 < MIN_DELAY || $2 > MAX_DELAY) {
yyerror("delay out of range (%d-%d)",
MIN_DELAY, MAX_DELAY);
YYERROR;
}
defs->delay = $2;
}
| BANDWIDTH NUMBER {
if ($2 < MIN_BANDWIDTH || $2 > MAX_BANDWIDTH) {
yyerror("bandwidth out of range (%d-%d)",
MIN_BANDWIDTH, MAX_BANDWIDTH);
YYERROR;
}
defs->bandwidth = $2;
}
| SPLITHORIZON yesno {
defs->splithorizon = $2;
}
;
%%
struct keywords {
const char *k_name;
int k_val;
};
static int
yyerror(const char *fmt, ...)
{
va_list ap;
char *msg;
file->errors++;
va_start(ap, fmt);
if (vasprintf(&msg, fmt, ap) == -1)
fatalx("yyerror vasprintf");
va_end(ap);
logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
free(msg);
return (0);
}
static int
kw_cmp(const void *k, const void *e)
{
return (strcmp(k, ((const struct keywords *)e)->k_name));
}
static int
lookup(char *s)
{
/* this has to be sorted always */
static const struct keywords keywords[] = {
{"active-timeout", ACTIVETIMEOUT},
{"address-family", AF},
{"autonomous-system", AS},
{"bandwidth", BANDWIDTH},
{"default-metric", DFLTMETRIC},
{"delay", DELAY},
{"fib-priority-external", FIBPRIORITY_EXT},
{"fib-priority-internal", FIBPRIORITY_INT},
{"fib-priority-summary", FIBPRIORITY_SUMM},
{"fib-update", FIBUPDATE},
{"hello-interval", HELLOINTERVAL},
{"holdtime", HOLDTIME},
{"include", INCLUDE},
{"interface", INTERFACE},
{"ipv4", IPV4},
{"ipv6", IPV6},
{"k-values", KVALUES},
{"maximum-hops", MAXHOPS},
{"maximum-paths", MAXPATHS},
{"metric", METRIC},
{"no", NO},
{"passive", PASSIVE},
{"rdomain", RDOMAIN},
{"redistribute", REDISTRIBUTE},
{"router-id", ROUTERID},
{"split-horizon", SPLITHORIZON},
{"summary-address", SUMMARY_ADDR},
{"variance", VARIANCE},
{"yes", YES}
};
const struct keywords *p;
p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
sizeof(keywords[0]), kw_cmp);
if (p)
return (p->k_val);
else
return (STRING);
}
#define START_EXPAND 1
#define DONE_EXPAND 2
static int expanding;
int
igetc(void)
{
int c;
while (1) {
if (file->ungetpos > 0)
c = file->ungetbuf[--file->ungetpos];
else
c = getc(file->stream);
if (c == START_EXPAND)
expanding = 1;
else if (c == DONE_EXPAND)
expanding = 0;
else
break;
}
return (c);
}
static int
lgetc(int quotec)
{
int c, next;
if (quotec) {
if ((c = igetc()) == EOF) {
yyerror("reached end of file while parsing "
"quoted string");
if (file == topfile || popfile() == EOF)
return (EOF);
return (quotec);
}
return (c);
}
while ((c = igetc()) == '\\') {
next = igetc();
if (next != '\n') {
c = next;
break;
}
yylval.lineno = file->lineno;
file->lineno++;
}
if (c == EOF) {
/*
* Fake EOL when hit EOF for the first time. This gets line
* count right if last line in included file is syntactically
* invalid and has no newline.
*/
if (file->eof_reached == 0) {
file->eof_reached = 1;
return ('\n');
}
while (c == EOF) {
if (file == topfile || popfile() == EOF)
return (EOF);
c = igetc();
}
}
return (c);
}
void
lungetc(int c)
{
if (c == EOF)
return;
if (file->ungetpos >= file->ungetsize) {
void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
if (p == NULL)
err(1, "%s", __func__);
file->ungetbuf = p;
file->ungetsize *= 2;
}
file->ungetbuf[file->ungetpos++] = c;
}
static int
findeol(void)
{
int c;
/* skip to either EOF or the first real EOL */
while (1) {
c = lgetc(0);
if (c == '\n') {
file->lineno++;
break;
}
if (c == EOF)
break;
}
return (ERROR);
}
static int
yylex(void)
{
char buf[8096];
char *p, *val;
int quotec, next, c;
int token;
top:
p = buf;
while ((c = lgetc(0)) == ' ' || c == '\t')
; /* nothing */
yylval.lineno = file->lineno;
if (c == '#')
while ((c = lgetc(0)) != '\n' && c != EOF)
; /* nothing */
if (c == '$' && !expanding) {
while (1) {
if ((c = lgetc(0)) == EOF)
return (0);
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
if (isalnum(c) || c == '_') {
*p++ = c;
continue;
}
*p = '\0';
lungetc(c);
break;
}
val = symget(buf);
if (val == NULL) {
yyerror("macro '%s' not defined", buf);
return (findeol());
}
p = val + strlen(val) - 1;
lungetc(DONE_EXPAND);
while (p >= val) {
lungetc((unsigned char)*p);
p--;
}
lungetc(START_EXPAND);
goto top;
}
switch (c) {
case '\'':
case '"':
quotec = c;
while (1) {
if ((c = lgetc(quotec)) == EOF)
return (0);
if (c == '\n') {
file->lineno++;
continue;
} else if (c == '\\') {
if ((next = lgetc(quotec)) == EOF)
return (0);
if (next == quotec || next == ' ' ||
next == '\t')
c = next;
else if (next == '\n') {
file->lineno++;
continue;
} else
lungetc(next);
} else if (c == quotec) {
*p = '\0';
break;
} else if (c == '\0') {
yyerror("syntax error");
return (findeol());
}
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
*p++ = c;
}
yylval.v.string = strdup(buf);
if (yylval.v.string == NULL)
err(1, "%s", __func__);
return (STRING);
}
#define allowed_to_end_number(x) \
(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
if (c == '-' || isdigit(c)) {
do {
*p++ = c;
if ((size_t)(p-buf) >= sizeof(buf)) {
yyerror("string too long");
return (findeol());
}
} while ((c = lgetc(0)) != EOF && isdigit(c));
lungetc(c);
if (p == buf + 1 && buf[0] == '-')
goto nodigits;
if (c == EOF || allowed_to_end_number(c)) {
const char *errstr = NULL;
*p = '\0';
yylval.v.number = strtonum(buf, LLONG_MIN,
LLONG_MAX, &errstr);
if (errstr) {
yyerror("\"%s\" invalid number: %s",
buf, errstr);
return (findeol());
}
return (NUMBER);
} else {
nodigits:
while (p > buf + 1)
lungetc((unsigned char)*--p);
c = (unsigned char)*--p;
if (c == '-')
return (c);
}
}
#define allowed_in_string(x) \
(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
x != '{' && x != '}' && \
x != '!' && x != '=' && x != '#' && \
x != ','))
if (isalnum(c) || c == ':' || c == '_') {
do {
*p++ = c;
if ((size_t)(p-buf) >= sizeof(buf)) {
yyerror("string too long");
return (findeol());
}
} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
lungetc(c);
*p = '\0';
if ((token = lookup(buf)) == STRING)
if ((yylval.v.string = strdup(buf)) == NULL)
err(1, "%s", __func__);
return (token);
}
if (c == '\n') {
yylval.lineno = file->lineno;
file->lineno++;
}
if (c == EOF)
return (0);
return (c);
}
static int
check_file_secrecy(int fd, const char *fname)
{
struct stat st;
if (fstat(fd, &st)) {
log_warn("cannot stat %s", fname);
return (-1);
}
if (st.st_uid != 0 && st.st_uid != getuid()) {
log_warnx("%s: owner not root or current user", fname);
return (-1);
}
if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
log_warnx("%s: group writable or world read/writable", fname);
return (-1);
}
return (0);
}
static struct file *
pushfile(const char *name, int secret)
{
struct file *nfile;
if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
log_warn("%s", __func__);
return (NULL);
}
if ((nfile->name = strdup(name)) == NULL) {
log_warn("%s", __func__);
free(nfile);
return (NULL);
}
if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
log_warn("%s: %s", __func__, nfile->name);
free(nfile->name);
free(nfile);
return (NULL);
} else if (secret &&
check_file_secrecy(fileno(nfile->stream), nfile->name)) {
fclose(nfile->stream);
free(nfile->name);
free(nfile);
return (NULL);
}
nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
nfile->ungetsize = 16;
nfile->ungetbuf = malloc(nfile->ungetsize);
if (nfile->ungetbuf == NULL) {
log_warn("%s", __func__);
fclose(nfile->stream);
free(nfile->name);
free(nfile);
return (NULL);
}
TAILQ_INSERT_TAIL(&files, nfile, entry);
return (nfile);
}
static int
popfile(void)
{
struct file *prev;
if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
prev->errors += file->errors;
TAILQ_REMOVE(&files, file, entry);
fclose(file->stream);
free(file->name);
free(file->ungetbuf);
free(file);
file = prev;
return (file ? 0 : EOF);
}
struct eigrpd_conf *
parse_config(char *filename)
{
struct sym *sym, *next;
conf = config_new_empty();
conf->rdomain = 0;
conf->fib_priority_internal = RTP_EIGRP;
conf->fib_priority_external = RTP_EIGRP;
conf->fib_priority_summary = RTP_EIGRP;
defs = &globaldefs;
defs->kvalues[0] = defs->kvalues[2] = 1;
defs->active_timeout = DEFAULT_ACTIVE_TIMEOUT;
defs->maximum_hops = DEFAULT_MAXIMUM_HOPS;
defs->maximum_paths = DEFAULT_MAXIMUM_PATHS;
defs->variance = DEFAULT_VARIANCE;
defs->hello_holdtime = DEFAULT_HELLO_HOLDTIME;
defs->hello_interval = DEFAULT_HELLO_INTERVAL;
defs->delay = DEFAULT_DELAY;
defs->bandwidth = DEFAULT_BANDWIDTH;
defs->splithorizon = 1;
if ((file = pushfile(filename,
!(global.cmd_opts & EIGRPD_OPT_NOACTION))) == NULL) {
free(conf);
return (NULL);
}
topfile = file;
yyparse();
errors = file->errors;
popfile();
/* Free macros and check which have not been used. */
TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
if ((global.cmd_opts & EIGRPD_OPT_VERBOSE2) && !sym->used)
fprintf(stderr, "warning: macro '%s' not "
"used\n", sym->nam);
if (!sym->persist) {
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entry);
free(sym);
}
}
/* check that all interfaces belong to the configured rdomain */
errors += conf_check_rdomain(conf->rdomain);
if (errors) {
clear_config(conf);
return (NULL);
}
if (conf->rtr_id.s_addr == 0)
conf->rtr_id.s_addr = get_rtr_id();
return (conf);
}
static int
symset(const char *nam, const char *val, int persist)
{
struct sym *sym;
TAILQ_FOREACH(sym, &symhead, entry) {
if (strcmp(nam, sym->nam) == 0)
break;
}
if (sym != NULL) {
if (sym->persist == 1)
return (0);
else {
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entry);
free(sym);
}
}
if ((sym = calloc(1, sizeof(*sym))) == NULL)
return (-1);
sym->nam = strdup(nam);
if (sym->nam == NULL) {
free(sym);
return (-1);
}
sym->val = strdup(val);
if (sym->val == NULL) {
free(sym->nam);
free(sym);
return (-1);
}
sym->used = 0;
sym->persist = persist;
TAILQ_INSERT_TAIL(&symhead, sym, entry);
return (0);
}
int
cmdline_symset(char *s)
{
char *sym, *val;
int ret;
if ((val = strrchr(s, '=')) == NULL)
return (-1);
sym = strndup(s, val - s);
if (sym == NULL)
errx(1, "%s: strndup", __func__);
ret = symset(sym, val + 1, 1);
free(sym);
return (ret);
}
static char *
symget(const char *nam)
{
struct sym *sym;
TAILQ_FOREACH(sym, &symhead, entry) {
if (strcmp(nam, sym->nam) == 0) {
sym->used = 1;
return (sym->val);
}
}
return (NULL);
}
static struct eigrp *
conf_get_instance(uint16_t as)
{
struct eigrp *e, *tmp;
if (eigrp_find(conf, af, as)) {
yyerror("autonomous-system %u already configured"
"for address-family %s", as, af_name(af));
return (NULL);
}
e = calloc(1, sizeof(struct eigrp));
if (e == NULL)
fatal(NULL);
e->af = af;
e->as = as;
SIMPLEQ_INIT(&e->redist_list);
TAILQ_INIT(&e->ei_list);
RB_INIT(&e->nbrs);
RB_INIT(&e->topology);
/* start local sequence number used by RTP */
e->seq_num = 1;
/* order by address-family and then by autonomous-system */
TAILQ_FOREACH(tmp, &conf->instances, entry)
if (tmp->af > e->af ||
(tmp->af == e->af && tmp->as > e->as))
break;
if (tmp)
TAILQ_INSERT_BEFORE(tmp, e, entry);
else
TAILQ_INSERT_TAIL(&conf->instances, e, entry);
return (e);
}
static struct eigrp_iface *
conf_get_if(struct kif *kif)
{
struct eigrp_iface *e;
TAILQ_FOREACH(e, &eigrp->ei_list, e_entry)
if (e->iface->ifindex == kif->ifindex) {
yyerror("interface %s already configured "
"for address-family %s and "
"autonomous-system %u", kif->ifname,
af_name(af), eigrp->as);
return (NULL);
}
e = eigrp_if_new(conf, eigrp, kif);
return (e);
}
int
conf_check_rdomain(unsigned int rdomain)
{
struct iface *iface;
int errs = 0;
TAILQ_FOREACH(iface, &conf->iface_list, entry) {
if (iface->rdomain != rdomain) {
logit(LOG_CRIT, "interface %s not in rdomain %u",
iface->name, rdomain);
errs++;
}
}
return (errs);
}
static void
clear_config(struct eigrpd_conf *xconf)
{
struct eigrp *e;
struct redistribute *r;
struct eigrp_iface *i;
struct summary_addr *s;
while ((e = TAILQ_FIRST(&xconf->instances)) != NULL) {
while (!SIMPLEQ_EMPTY(&e->redist_list)) {
r = SIMPLEQ_FIRST(&e->redist_list);
SIMPLEQ_REMOVE_HEAD(&e->redist_list, entry);
free(r);
}
while ((i = TAILQ_FIRST(&e->ei_list)) != NULL) {
RB_REMOVE(iface_id_head, &ifaces_by_id, i);
TAILQ_REMOVE(&e->ei_list, i, e_entry);
TAILQ_REMOVE(&e->ei_list, i, i_entry);
while ((s = TAILQ_FIRST(&i->summary_list)) != NULL) {
TAILQ_REMOVE(&i->summary_list, s, entry);
free(s);
}
if (TAILQ_EMPTY(&i->iface->ei_list)) {
TAILQ_REMOVE(&xconf->iface_list, i->iface, entry);
free(i->iface);
}
free(i);
}
TAILQ_REMOVE(&xconf->instances, e, entry);
free(e);
}
free(xconf);
}
static uint32_t
get_rtr_id(void)
{
struct ifaddrs *ifap, *ifa;
uint32_t ip = 0, cur, localnet;
localnet = htonl(INADDR_LOOPBACK & IN_CLASSA_NET);
if (getifaddrs(&ifap) == -1)
fatal("getifaddrs");
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (strncmp(ifa->ifa_name, "carp", 4) == 0)
continue;
if (ifa->ifa_addr == NULL ||
ifa->ifa_addr->sa_family != AF_INET)
continue;
cur = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
if ((cur & localnet) == localnet) /* skip 127/8 */
continue;
if (ntohl(cur) < ntohl(ip) || ip == 0)
ip = cur;
}
freeifaddrs(ifap);
if (ip == 0)
fatal("router-id is 0.0.0.0");
return (ip);
}
static int
get_prefix(const char *s, union eigrpd_addr *addr, uint8_t *plen)
{
char *p, *ps;
const char *errstr;
int maxplen;
switch (af) {
case AF_INET:
maxplen = 32;
break;
case AF_INET6:
maxplen = 128;
break;
default:
return (-1);
}
if ((p = strrchr(s, '/')) != NULL) {
*plen = strtonum(p + 1, 0, maxplen, &errstr);
if (errstr) {
log_warnx("prefixlen is %s: %s", errstr, p + 1);
return (-1);
}
if ((ps = malloc(strlen(s) - strlen(p) + 1)) == NULL)
fatal("get_prefix: malloc");
strlcpy(ps, s, strlen(s) - strlen(p) + 1);
} else {
if ((ps = strdup(s)) == NULL)
fatal("get_prefix: strdup");
*plen = maxplen;
}
memset(addr, 0, sizeof(union eigrpd_addr));
switch (af) {
case AF_INET:
if (inet_pton(AF_INET, ps, &addr->v4) != 1) {
free(ps);
return (-1);
}
break;
case AF_INET6:
if (inet_pton(AF_INET6, ps, &addr->v6) != 1) {
free(ps);
return (-1);
}
break;
default:
free(ps);
return (-1);
}
eigrp_applymask(af, addr, addr, *plen);
free(ps);
return (0);
}
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