572 lines
12 KiB
Plaintext
572 lines
12 KiB
Plaintext
%{
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/* $NetBSD: cfparse.y,v 1.4 1995/12/10 10:06:57 mycroft Exp $ */
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/*
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* Configuration file parser for mrouted.
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*
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* Written by Bill Fenner, NRL, 1994
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* Copyright (c) 1994
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* Naval Research Laboratory (NRL/CCS)
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* and the
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* Defense Advanced Research Projects Agency (DARPA)
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*
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright notice and
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* this permission notice appear in all copies of the software, derivative
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* works or modified versions, and any portions thereof, and that both notices
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* appear in supporting documentation.
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*
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* NRL AND DARPA ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION AND
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* DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM
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* THE USE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include "defs.h"
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#include <netdb.h>
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#include <ifaddrs.h>
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/*
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* Local function declarations
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*/
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static void fatal(const char *fmt, ...)
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__attribute__((__format__ (printf, 1, 2)))
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__attribute__((__nonnull__ (1)));
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static void warn(const char *fmt, ...)
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__attribute__((__format__ (printf, 1, 2)))
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__attribute__((__nonnull__ (1)));
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static void yyerror(char *s);
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static char * next_word(void);
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static int yylex(void);
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static u_int32_t valid_if(char *s);
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static const char * ifconfaddr(u_int32_t a);
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int yyparse(void);
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static FILE *f;
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extern int udp_socket;
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char *configfilename = _PATH_MROUTED_CONF;
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extern int cache_lifetime;
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extern int max_prune_lifetime;
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static int lineno;
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static struct uvif *v;
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static int order;
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struct addrmask {
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u_int32_t addr;
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int mask;
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};
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struct boundnam {
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char *name;
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struct addrmask bound;
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};
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#define MAXBOUNDS 20
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struct boundnam boundlist[MAXBOUNDS]; /* Max. of 20 named boundaries */
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int numbounds = 0; /* Number of named boundaries */
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%}
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%union
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{
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int num;
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char *ptr;
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struct addrmask addrmask;
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u_int32_t addr;
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};
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%token CACHE_LIFETIME PRUNING
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%token PHYINT TUNNEL NAME
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%token DISABLE IGMPV1 SRCRT
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%token METRIC THRESHOLD RATE_LIMIT BOUNDARY NETMASK ALTNET
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%token <num> BOOLEAN
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%token <num> NUMBER
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%token <ptr> STRING
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%token <addrmask> ADDRMASK
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%token <addr> ADDR
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%type <addr> interface addrname
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%type <addrmask> bound boundary addrmask
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%start conf
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%%
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conf : stmts
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;
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stmts : /* Empty */
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| stmts stmt
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;
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stmt : error
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| PHYINT interface {
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vifi_t vifi;
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if (order)
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fatal("phyints must appear before tunnels");
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for (vifi = 0, v = uvifs;
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vifi < numvifs;
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++vifi, ++v)
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if (!(v->uv_flags & VIFF_TUNNEL) &&
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$2 == v->uv_lcl_addr)
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break;
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if (vifi == numvifs)
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fatal("%s is not a configured interface",
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inet_fmt($2,s1));
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}
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ifmods
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| TUNNEL interface addrname {
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const char *ifname;
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struct ifreq ffr;
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vifi_t vifi;
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order++;
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ifname = ifconfaddr($2);
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if (ifname == 0)
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fatal("Tunnel local address %s is not mine",
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inet_fmt($2, s1));
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strlcpy(ffr.ifr_name, ifname, sizeof(ffr.ifr_name));
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if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ffr) == -1)
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fatal("ioctl SIOCGIFFLAGS on %s",ffr.ifr_name);
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if (ffr.ifr_flags & IFF_LOOPBACK)
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fatal("Tunnel local address %s is a loopback interface",
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inet_fmt($2, s1));
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if (ifconfaddr($3) != 0)
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fatal("Tunnel remote address %s is one of mine",
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inet_fmt($3, s1));
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for (vifi = 0, v = uvifs;
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vifi < numvifs;
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++vifi, ++v)
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if (v->uv_flags & VIFF_TUNNEL) {
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if ($3 == v->uv_rmt_addr)
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fatal("Duplicate tunnel to %s",
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inet_fmt($3, s1));
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} else if (!(v->uv_flags & VIFF_DISABLED)) {
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if (($3 & v->uv_subnetmask) == v->uv_subnet)
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fatal("Unnecessary tunnel to %s",
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inet_fmt($3,s1));
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}
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if (numvifs == MAXVIFS)
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fatal("too many vifs");
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v = &uvifs[numvifs];
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v->uv_flags = VIFF_TUNNEL;
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v->uv_metric = DEFAULT_METRIC;
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v->uv_rate_limit= DEFAULT_TUN_RATE_LIMIT;
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v->uv_threshold = DEFAULT_THRESHOLD;
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v->uv_lcl_addr = $2;
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v->uv_rmt_addr = $3;
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v->uv_subnet = 0;
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v->uv_subnetmask= 0;
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v->uv_subnetbcast= 0;
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strncpy(v->uv_name, ffr.ifr_name, IFNAMSIZ);
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v->uv_groups = NULL;
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v->uv_neighbors = NULL;
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v->uv_acl = NULL;
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v->uv_addrs = NULL;
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if (!(ffr.ifr_flags & IFF_UP)) {
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v->uv_flags |= VIFF_DOWN;
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vifs_down = TRUE;
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}
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}
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tunnelmods
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{
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logit(LOG_INFO, 0,
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"installing tunnel from %s to %s as vif #%u - rate=%d",
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inet_fmt($2, s1), inet_fmt($3, s2),
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numvifs, v->uv_rate_limit);
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++numvifs;
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}
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| PRUNING BOOLEAN { pruning = $2; }
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| CACHE_LIFETIME NUMBER { cache_lifetime = $2;
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max_prune_lifetime = cache_lifetime * 2;
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}
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| NAME STRING boundary { if (numbounds >= MAXBOUNDS) {
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fatal("Too many named boundaries (max %d)", MAXBOUNDS);
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}
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boundlist[numbounds].name = strdup($2);
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boundlist[numbounds++].bound = $3;
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}
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;
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tunnelmods : /* empty */
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| tunnelmods tunnelmod
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;
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tunnelmod : mod
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| SRCRT { fatal("Source-route tunnels not supported"); }
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;
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ifmods : /* empty */
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| ifmods ifmod
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;
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ifmod : mod
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| DISABLE { v->uv_flags |= VIFF_DISABLED; }
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| IGMPV1 { v->uv_flags |= VIFF_IGMPV1; }
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| NETMASK addrname {
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u_int32_t subnet, mask;
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mask = $2;
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subnet = v->uv_lcl_addr & mask;
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if (!inet_valid_subnet(subnet, mask))
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fatal("Invalid netmask");
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v->uv_subnet = subnet;
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v->uv_subnetmask = mask;
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v->uv_subnetbcast = subnet | ~mask;
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}
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| NETMASK {
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warn("Expected address after netmask keyword, ignored");
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}
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| ALTNET addrmask {
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struct phaddr *ph;
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ph = malloc(sizeof(struct phaddr));
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if (ph == NULL)
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fatal("out of memory");
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if ($2.mask) {
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VAL_TO_MASK(ph->pa_subnetmask, $2.mask);
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} else
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ph->pa_subnetmask = v->uv_subnetmask;
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ph->pa_subnet = $2.addr & ph->pa_subnetmask;
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ph->pa_subnetbcast = ph->pa_subnet | ~ph->pa_subnetmask;
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if ($2.addr & ~ph->pa_subnetmask)
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warn("Extra subnet %s/%d has host bits set",
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inet_fmt($2.addr,s1), $2.mask);
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ph->pa_next = v->uv_addrs;
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v->uv_addrs = ph;
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}
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| ALTNET {
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warn("Expected address after altnet keyword, ignored");
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}
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;
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mod : THRESHOLD NUMBER { if ($2 < 1 || $2 > 255)
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fatal("Invalid threshold %d",$2);
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v->uv_threshold = $2;
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}
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| THRESHOLD {
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warn("Expected number after threshold keyword, ignored");
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}
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| METRIC NUMBER { if ($2 < 1 || $2 > UNREACHABLE)
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fatal("Invalid metric %d",$2);
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v->uv_metric = $2;
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}
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| METRIC {
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warn("Expected number after metric keyword, ignored");
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}
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| RATE_LIMIT NUMBER { if ($2 > MAX_RATE_LIMIT)
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fatal("Invalid rate_limit %d",$2);
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v->uv_rate_limit = $2;
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}
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| RATE_LIMIT {
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warn("Expected number after rate_limit keyword, ignored");
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}
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| BOUNDARY bound {
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struct vif_acl *v_acl;
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v_acl = malloc(sizeof(struct vif_acl));
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if (v_acl == NULL)
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fatal("out of memory");
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VAL_TO_MASK(v_acl->acl_mask, $2.mask);
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v_acl->acl_addr = $2.addr & v_acl->acl_mask;
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if ($2.addr & ~v_acl->acl_mask)
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warn("Boundary spec %s/%d has host bits set",
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inet_fmt($2.addr,s1),$2.mask);
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v_acl->acl_next = v->uv_acl;
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v->uv_acl = v_acl;
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}
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| BOUNDARY {
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warn("Expected boundary spec after boundary keyword, ignored");
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}
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;
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interface : ADDR { $$ = $1; }
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| STRING {
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$$ = valid_if($1);
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if ($$ == 0)
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fatal("Invalid interface name %s",$1);
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}
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;
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addrname : ADDR { $$ = $1; }
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| STRING { struct hostent *hp;
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if ((hp = gethostbyname($1)) == NULL)
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fatal("No such host %s", $1);
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if (hp->h_addr_list[1])
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fatal("Hostname %s does not %s",
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$1, "map to a unique address");
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bcopy(hp->h_addr_list[0], &$$,
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hp->h_length);
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}
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bound : boundary { $$ = $1; }
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| STRING { int i;
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for (i=0; i < numbounds; i++) {
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if (!strcmp(boundlist[i].name, $1)) {
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$$ = boundlist[i].bound;
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break;
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}
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}
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if (i == numbounds) {
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fatal("Invalid boundary name %s",$1);
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}
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}
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;
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boundary : ADDRMASK {
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if ((ntohl($1.addr) & 0xff000000) != 0xef000000) {
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fatal("Boundaries must be 239.x.x.x, not %s/%d",
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inet_fmt($1.addr, s1), $1.mask);
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}
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$$ = $1;
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}
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;
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addrmask : ADDRMASK { $$ = $1; }
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| ADDR { $$.addr = $1; $$.mask = 0; }
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;
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%%
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static void
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fatal(const char *fmt, ...)
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{
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va_list ap;
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char buf[200];
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va_start(ap, fmt);
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vsnprintf(buf, sizeof buf, fmt, ap);
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va_end(ap);
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logit(LOG_ERR,0,"%s: %s near line %d", configfilename, buf, lineno);
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}
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static void
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warn(const char *fmt, ...)
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{
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va_list ap;
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char buf[200];
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va_start(ap, fmt);
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vsnprintf(buf, sizeof buf, fmt, ap);
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va_end(ap);
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logit(LOG_WARNING,0,"%s: %s near line %d", configfilename, buf, lineno);
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}
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static void
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yyerror(s)
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char *s;
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{
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logit(LOG_ERR, 0, "%s: %s near line %d", configfilename, s, lineno);
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}
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static char *
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next_word()
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{
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static char buf[1024];
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static char *p=NULL;
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extern FILE *f;
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char *q;
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while (1) {
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if (!p || !*p) {
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lineno++;
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if (fgets(buf, sizeof(buf), f) == NULL)
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return NULL;
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p = buf;
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}
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while (*p && (*p == ' ' || *p == '\t')) /* skip whitespace */
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p++;
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if (*p == '#') {
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p = NULL; /* skip comments */
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continue;
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}
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q = p;
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while (*p && *p != ' ' && *p != '\t' && *p != '\n')
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p++; /* find next whitespace */
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*p++ = '\0'; /* null-terminate string */
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if (!*q) {
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p = NULL;
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continue; /* if 0-length string, read another line */
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}
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return q;
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}
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}
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static int
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yylex()
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{
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int n;
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u_int32_t addr;
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char *q;
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if ((q = next_word()) == NULL) {
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return 0;
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}
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if (!strcmp(q,"cache_lifetime"))
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return CACHE_LIFETIME;
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if (!strcmp(q,"pruning"))
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return PRUNING;
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if (!strcmp(q,"phyint"))
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return PHYINT;
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if (!strcmp(q,"tunnel"))
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return TUNNEL;
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if (!strcmp(q,"disable"))
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return DISABLE;
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if (!strcmp(q,"metric"))
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return METRIC;
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if (!strcmp(q,"threshold"))
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return THRESHOLD;
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if (!strcmp(q,"rate_limit"))
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return RATE_LIMIT;
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if (!strcmp(q,"srcrt") || !strcmp(q,"sourceroute"))
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return SRCRT;
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if (!strcmp(q,"boundary"))
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return BOUNDARY;
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if (!strcmp(q,"netmask"))
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return NETMASK;
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if (!strcmp(q,"igmpv1"))
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return IGMPV1;
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if (!strcmp(q,"altnet"))
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return ALTNET;
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if (!strcmp(q,"name"))
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return NAME;
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if (!strcmp(q,"on") || !strcmp(q,"yes")) {
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yylval.num = 1;
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return BOOLEAN;
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}
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if (!strcmp(q,"off") || !strcmp(q,"no")) {
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yylval.num = 0;
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return BOOLEAN;
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}
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if (sscanf(q,"%[.0-9]/%d%c",s1,&n,s2) == 2) {
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if ((addr = inet_parse(s1)) != 0xffffffff) {
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yylval.addrmask.mask = n;
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yylval.addrmask.addr = addr;
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return ADDRMASK;
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}
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/* fall through to returning STRING */
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}
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if (sscanf(q,"%[.0-9]%c",s1,s2) == 1) {
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if ((addr = inet_parse(s1)) != 0xffffffff &&
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inet_valid_host(addr)) {
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yylval.addr = addr;
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return ADDR;
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}
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}
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if (sscanf(q,"0x%8x%c",&n,s1) == 1) {
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yylval.addr = n;
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return ADDR;
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}
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if (sscanf(q,"%d%c",&n,s1) == 1) {
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yylval.num = n;
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return NUMBER;
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}
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yylval.ptr = q;
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return STRING;
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}
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void
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config_vifs_from_file()
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{
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extern FILE *f;
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order = 0;
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numbounds = 0;
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lineno = 0;
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if ((f = fopen(configfilename, "r")) == NULL) {
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if (errno != ENOENT)
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logit(LOG_ERR, errno, "can't open %s", configfilename);
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return;
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}
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yyparse();
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fclose(f);
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}
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static u_int32_t
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valid_if(s)
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char *s;
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{
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register vifi_t vifi;
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register struct uvif *v;
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for (vifi=0, v=uvifs; vifi<numvifs; vifi++, v++)
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if (!strcmp(v->uv_name, s))
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return v->uv_lcl_addr;
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return 0;
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}
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static const char *
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ifconfaddr(a)
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u_int32_t a;
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{
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static char ifname[IFNAMSIZ];
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struct ifaddrs *ifap, *ifa;
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if (getifaddrs(&ifap) != 0)
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return (NULL);
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
|
|
if (ifa->ifa_addr != NULL &&
|
|
ifa->ifa_addr->sa_family == AF_INET &&
|
|
((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == a) {
|
|
strlcpy(ifname, ifa->ifa_name, sizeof(ifname));
|
|
freeifaddrs(ifap);
|
|
return (ifname);
|
|
}
|
|
}
|
|
freeifaddrs(ifap);
|
|
return (0);
|
|
}
|