%{ /* * Configuration file parser for mrouted. * * Written by Bill Fenner, NRL, 1994 * * $Id: cfparse.y,v 1.8 1998/06/09 05:01:27 imp Exp $ * cfparse.y,v 3.8.4.30 1998/03/01 01:48:58 fenner Exp */ #include #ifdef __STDC__ #include #else #include #endif #include "defs.h" #include /* * Local function declarations */ static void fatal __P((char *fmt, ...)); static void warn __P((char *fmt, ...)); static void yyerror __P((char *s)); static char * next_word __P((void)); static int yylex __P((void)); static u_int32 valid_if __P((char *s)); static struct ifreq * ifconfaddr __P((struct ifconf *ifcp, u_int32 a)); int yyparse __P((void)); static FILE *f; char *configfilename = _PATH_MROUTED_CONF; extern int cache_lifetime; extern int prune_lifetime; /* imported from config.c, with slight memory leak */ extern struct ifconf ifc; int allow_black_holes = 0; static int lineno; static struct uvif *v; static int order, state; static int noflood = 0; static int rexmit = VIFF_REXMIT_PRUNES; struct addrmask { u_int32 addr; int mask; }; struct boundnam { char *name; struct addrmask bound; }; #define MAXBOUNDS 20 struct boundnam boundlist[MAXBOUNDS]; /* Max. of 20 named boundaries */ int numbounds = 0; /* Number of named boundaries */ %} %union { int num; char *ptr; struct addrmask addrmask; u_int32 addr; struct vf_element *filterelem; }; %token CACHE_LIFETIME PRUNE_LIFETIME PRUNING BLACK_HOLE NOFLOOD %token PHYINT TUNNEL NAME %token DISABLE IGMPV1 SRCRT BESIDE %token METRIC THRESHOLD RATE_LIMIT BOUNDARY NETMASK ALTNET ADVERT_METRIC %token FILTER ACCEPT DENY EXACT BIDIR REXMIT_PRUNES REXMIT_PRUNES2 %token PASSIVE ALLOW_NONPRUNERS %token NOTRANSIT BLASTER FORCE_LEAF %token PRUNE_LIFETIME2 NOFLOOD2 %token SYSNAM SYSCONTACT SYSVERSION SYSLOCATION %token BOOLEAN %token NUMBER %token STRING %token ADDRMASK %token ADDR %type interface addrname %type bound boundary addrmask %type filter filtlist filtelement filtelem %start conf %% conf : stmts ; stmts : /* Empty */ | stmts stmt ; stmt : error | PHYINT interface { vifi_t vifi; state++; if (order) fatal("phyints must appear before tunnels"); for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) if (!(v->uv_flags & VIFF_TUNNEL) && $2 == v->uv_lcl_addr) break; if (vifi == numvifs) fatal("%s is not a configured interface", inet_fmt($2,s1)); } ifmods | TUNNEL interface addrname { struct ifreq *ifr; struct ifreq ffr; vifi_t vifi; order++; ifr = ifconfaddr(&ifc, $2); if (ifr == 0) fatal("Tunnel local address %s is not mine", inet_fmt($2, s1)); if (((ntohl($2) & IN_CLASSA_NET) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) fatal("Tunnel local address %s is a loopback address", inet_fmt($2, s1)); if (ifconfaddr(&ifc, $3) != 0) fatal("Tunnel remote address %s is one of mine", inet_fmt($3, s1)); for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) if (v->uv_flags & VIFF_TUNNEL) { if ($3 == v->uv_rmt_addr) fatal("Duplicate tunnel to %s", inet_fmt($3, s1)); } else if (!(v->uv_flags & VIFF_DISABLED)) { if (($3 & v->uv_subnetmask) == v->uv_subnet) fatal("Unnecessary tunnel to %s, same subnet as vif %d (%s)", inet_fmt($3,s1), vifi, v->uv_name); } if (numvifs == MAXVIFS) fatal("too many vifs"); strncpy(ffr.ifr_name, ifr->ifr_name, IFNAMSIZ); if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ffr)<0) fatal("ioctl SIOCGIFFLAGS on %s", ffr.ifr_name); v = &uvifs[numvifs]; zero_vif(v, 1); v->uv_flags = VIFF_TUNNEL | rexmit | noflood; v->uv_flags |= VIFF_OTUNNEL; /*XXX*/ v->uv_lcl_addr = $2; v->uv_rmt_addr = $3; v->uv_dst_addr = $3; strncpy(v->uv_name, ffr.ifr_name, IFNAMSIZ); v->uv_name[IFNAMSIZ-1]='\0'; if (!(ffr.ifr_flags & IFF_UP)) { v->uv_flags |= VIFF_DOWN; vifs_down = TRUE; } } tunnelmods { if (!(v->uv_flags & VIFF_OTUNNEL)) { init_ipip_on_vif(v); } log(LOG_INFO, 0, "installing tunnel from %s to %s as vif #%u - rate=%d", inet_fmt($2, s1), inet_fmt($3, s2), numvifs, v->uv_rate_limit); ++numvifs; } | CACHE_LIFETIME NUMBER { if ($2 < MIN_CACHE_LIFETIME) { warn("cache_lifetime %d must be at least %d", $2, MIN_CACHE_LIFETIME); } else { cache_lifetime = $2; } } | PRUNE_LIFETIME NUMBER { if ($2 < MIN_PRUNE_LIFETIME) { warn("prune_lifetime %d must be at least %d", $2, MIN_PRUNE_LIFETIME); } else { prune_lifetime = $2; } } | PRUNING BOOLEAN { if ($2 != 1) { warn("Disabling pruning is no longer supported"); } } | BLACK_HOLE { #ifdef ALLOW_BLACK_HOLES allow_black_holes = 1; #endif } /* * Turn off initial flooding (until subordinateness is learned * via route exchange) on all phyints and set the default for * all further tunnels. */ | NOFLOOD { vifi_t vifi; noflood = VIFF_NOFLOOD; for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) v->uv_flags |= VIFF_NOFLOOD; } /* * Turn on prune retransmission on all interfaces. * Tunnels default to retransmitting, so this just * needs to turn on phyints. */ | REXMIT_PRUNES { vifi_t vifi; for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) v->uv_flags |= VIFF_REXMIT_PRUNES; } /* * If true, do as above. If false, no need to turn * it off for phyints since they default to not * rexmit; need to set flag to not rexmit on tunnels. */ | REXMIT_PRUNES BOOLEAN { if ($2) { vifi_t vifi; for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) v->uv_flags |= VIFF_REXMIT_PRUNES; } else { rexmit = 0; } } | NAME STRING boundary { if (numbounds >= MAXBOUNDS) { fatal("Too many named boundaries (max %d)", MAXBOUNDS); } boundlist[numbounds].name = malloc(strlen($2) + 1); strcpy(boundlist[numbounds].name, $2); boundlist[numbounds++].bound = $3; } | SYSNAM STRING { #ifdef SNMP set_sysName($2); #endif /* SNMP */ } | SYSCONTACT STRING { #ifdef SNMP set_sysContact($2); #endif /* SNMP */ } | SYSVERSION STRING { #ifdef SNMP set_sysVersion($2); #endif /* SNMP */ } | SYSLOCATION STRING { #ifdef SNMP set_sysLocation($2); #endif /* SNMP */ } ; tunnelmods : /* empty */ | tunnelmods tunnelmod ; tunnelmod : mod | BESIDE { v->uv_flags |= VIFF_OTUNNEL; } | BESIDE BOOLEAN { if ($2) { v->uv_flags |= VIFF_OTUNNEL; } else { v->uv_flags &= ~VIFF_OTUNNEL; } } | SRCRT { fatal("Source-route tunnels not supported"); } ; ifmods : /* empty */ | ifmods ifmod ; ifmod : mod | DISABLE { v->uv_flags |= VIFF_DISABLED; } | IGMPV1 { v->uv_flags |= VIFF_IGMPV1; } | NETMASK addrname { u_int32 subnet, mask; mask = $2; subnet = v->uv_lcl_addr & mask; if (!inet_valid_subnet(subnet, mask)) fatal("Invalid netmask"); v->uv_subnet = subnet; v->uv_subnetmask = mask; v->uv_subnetbcast = subnet | ~mask; } | NETMASK { warn("Expected address after netmask keyword, ignored"); } | ALTNET addrmask { struct phaddr *ph; ph = (struct phaddr *)malloc(sizeof(struct phaddr)); if (ph == NULL) fatal("out of memory"); if ($2.mask) { VAL_TO_MASK(ph->pa_subnetmask, $2.mask); } else ph->pa_subnetmask = v->uv_subnetmask; ph->pa_subnet = $2.addr & ph->pa_subnetmask; ph->pa_subnetbcast = ph->pa_subnet | ~ph->pa_subnetmask; if ($2.addr & ~ph->pa_subnetmask) warn("Extra subnet %s/%d has host bits set", inet_fmt($2.addr,s1), $2.mask); ph->pa_next = v->uv_addrs; v->uv_addrs = ph; } | ALTNET { warn("Expected address after altnet keyword, ignored"); } | FORCE_LEAF { v->uv_flags |= VIFF_FORCE_LEAF; } | FORCE_LEAF BOOLEAN { if ($2) { v->uv_flags |= VIFF_FORCE_LEAF; } else { v->uv_flags &= ~VIFF_FORCE_LEAF; } } ; mod : THRESHOLD NUMBER { if ($2 < 1 || $2 > 255) fatal("Invalid threshold %d",$2); v->uv_threshold = $2; } | THRESHOLD { warn("Expected number after threshold keyword, ignored"); } | METRIC NUMBER { if ($2 < 1 || $2 > UNREACHABLE) fatal("Invalid metric %d",$2); v->uv_metric = $2; } | METRIC { warn("Expected number after metric keyword, ignored"); } | ADVERT_METRIC NUMBER { if ($2 < 0 || $2 > UNREACHABLE - 1) fatal("Invalid advert_metric %d", $2); v->uv_admetric = $2; } | ADVERT_METRIC { warn("Expected number after advert_metric keyword, ignored"); } | RATE_LIMIT NUMBER { if ($2 > MAX_RATE_LIMIT) fatal("Invalid rate_limit %d",$2); v->uv_rate_limit = $2; } | RATE_LIMIT { warn("Expected number after rate_limit keyword, ignored"); } | BOUNDARY bound { struct vif_acl *v_acl; v_acl = (struct vif_acl *)malloc(sizeof(struct vif_acl)); if (v_acl == NULL) fatal("out of memory"); VAL_TO_MASK(v_acl->acl_mask, $2.mask); v_acl->acl_addr = $2.addr & v_acl->acl_mask; if ($2.addr & ~v_acl->acl_mask) warn("Boundary spec %s/%d has host bits set", inet_fmt($2.addr,s1),$2.mask); v_acl->acl_next = v->uv_acl; v->uv_acl = v_acl; } | BOUNDARY { warn("Expected boundary spec after boundary keyword, ignored"); } | REXMIT_PRUNES2 { v->uv_flags |= VIFF_REXMIT_PRUNES; } | REXMIT_PRUNES2 BOOLEAN { if ($2) { v->uv_flags |= VIFF_REXMIT_PRUNES; } else { v->uv_flags &= ~VIFF_REXMIT_PRUNES; } } | PASSIVE { v->uv_flags |= VIFF_PASSIVE; } | NOFLOOD2 { v->uv_flags |= VIFF_NOFLOOD; } | NOTRANSIT { v->uv_flags |= VIFF_NOTRANSIT; } | BLASTER { v->uv_flags |= VIFF_BLASTER; blaster_alloc(v - uvifs); } | ALLOW_NONPRUNERS { v->uv_flags |= VIFF_ALLOW_NONPRUNERS; } | PRUNE_LIFETIME2 NUMBER { if ($2 < MIN_PRUNE_LIFETIME) { warn("prune_lifetime %d must be at least %d", $2, MIN_PRUNE_LIFETIME); } else { v->uv_prune_lifetime = $2; } } | ACCEPT filter { if (v->uv_filter == NULL) { struct vif_filter *v_filter; v_filter = (struct vif_filter *)malloc(sizeof(struct vif_filter)); if (v_filter == NULL) fatal("out of memory"); v_filter->vf_flags = 0; v_filter->vf_type = VFT_ACCEPT; v_filter->vf_filter = $2; v->uv_filter = v_filter; } else if (v->uv_filter->vf_type != VFT_ACCEPT) { fatal("can't accept and deny"); } else { struct vf_element *p; p = v->uv_filter->vf_filter; while (p->vfe_next) p = p->vfe_next; p->vfe_next = $2; } } | ACCEPT { warn("Expected filter spec after accept keyword, ignored"); } | DENY filter { if (v->uv_filter == NULL) { struct vif_filter *v_filter; v_filter = (struct vif_filter *)malloc(sizeof(struct vif_filter)); if (v_filter == NULL) fatal("out of memory"); v_filter->vf_flags = 0; v_filter->vf_type = VFT_DENY; v_filter->vf_filter = $2; v->uv_filter = v_filter; } else if (v->uv_filter->vf_type != VFT_DENY) { fatal("can't accept and deny"); } else { struct vf_element *p; p = v->uv_filter->vf_filter; while (p->vfe_next) p = p->vfe_next; p->vfe_next = $2; } } | DENY { warn("Expected filter spec after deny keyword, ignored"); } | BIDIR { if (v->uv_filter == NULL) { fatal("bidir goes after filters"); } v->uv_filter->vf_flags |= VFF_BIDIR; } ; interface : ADDR { $$ = $1; } | STRING { $$ = valid_if($1); if ($$ == 0) fatal("Invalid interface name %s",$1); } ; addrname : ADDR { $$ = $1; } | STRING { struct hostent *hp; if ((hp = gethostbyname($1)) == NULL || hp->h_length != sizeof($$)) fatal("No such host %s", $1); if (hp->h_addr_list[1]) fatal("Hostname %s does not %s", $1, "map to a unique address"); bcopy(hp->h_addr_list[0], &$$, hp->h_length); } bound : boundary { $$ = $1; } | STRING { int i; for (i=0; i < numbounds; i++) { if (!strcmp(boundlist[i].name, $1)) { $$ = boundlist[i].bound; break; } } if (i == numbounds) { fatal("Invalid boundary name %s",$1); } } ; boundary : ADDRMASK { #ifdef ALLOW_BLACK_HOLES if (!allow_black_holes) #endif if ((ntohl($1.addr) & 0xff000000) != 0xef000000) { fatal("Boundaries must be 239.x.x.x, not %s/%d", inet_fmt($1.addr, s1), $1.mask); } $$ = $1; } ; addrmask : ADDRMASK { $$ = $1; } | ADDR { $$.addr = $1; $$.mask = 0; } ; filter : filtlist { $$ = $1; } | STRING { fatal("named filters no implemented yet"); } ; filtlist : filtelement { $$ = $1; } | filtelement filtlist { $1->vfe_next = $2; $$ = $1; } ; filtelement : filtelem { $$ = $1; } | filtelem EXACT { $1->vfe_flags |= VFEF_EXACT; $$ = $1; } ; filtelem : ADDRMASK { struct vf_element *vfe; vfe = (struct vf_element *)malloc(sizeof(struct vf_element)); if (vfe == NULL) fatal("out of memory"); vfe->vfe_addr = $1.addr; VAL_TO_MASK(vfe->vfe_mask, $1.mask); vfe->vfe_flags = 0; vfe->vfe_next = NULL; $$ = vfe; } %% #ifdef __STDC__ static void fatal(char *fmt, ...) { va_list ap; char buf[200]; va_start(ap, fmt); #else /*VARARGS1*/ static void fatal(fmt, va_alist) char *fmt; va_dcl { va_list ap; char buf[200]; va_start(ap); #endif vsprintf(buf, fmt, ap); va_end(ap); log(LOG_ERR,0,"%s: %s near line %d", configfilename, buf, lineno); } #ifdef __STDC__ static void warn(char *fmt, ...) { va_list ap; char buf[200]; va_start(ap, fmt); #else /*VARARGS1*/ static void warn(fmt, va_alist) char *fmt; va_dcl { va_list ap; char buf[200]; va_start(ap); #endif vsprintf(buf, fmt, ap); va_end(ap); log(LOG_WARNING,0,"%s: %s near line %d", configfilename, buf, lineno); } static void yyerror(s) char *s; { log(LOG_ERR, 0, "%s: %s near line %d", configfilename, s, lineno); } static char * next_word() { static char buf[1024]; static char *p=NULL; char *q; while (1) { if (!p || !*p) { lineno++; if (fgets(buf, sizeof(buf), f) == NULL) return NULL; p = buf; } while (*p && (*p == ' ' || *p == '\t')) /* skip whitespace */ p++; if (*p == '#') { p = NULL; /* skip comments */ continue; } q = p; #ifdef SNMP if (*p == '"') { p++; while (*p && *p != '"' && *p != '\n') p++; /* find next whitespace */ if (*p == '"') p++; } else #endif while (*p && *p != ' ' && *p != '\t' && *p != '\n') p++; /* find next whitespace */ *p++ = '\0'; /* null-terminate string */ if (!*q) { p = NULL; continue; /* if 0-length string, read another line */ } return q; } } /* * List of keywords. Must have an empty record at the end to terminate * list. If a second value is specified, the first is used at the beginning * of the file and the second is used while parsing interfaces (e.g. after * the first "phyint" or "tunnel" keyword). */ static struct keyword { char *word; int val1; int val2; } words[] = { { "cache_lifetime", CACHE_LIFETIME }, { "prune_lifetime", PRUNE_LIFETIME, PRUNE_LIFETIME2 }, { "pruning", PRUNING }, { "phyint", PHYINT }, { "tunnel", TUNNEL }, { "disable", DISABLE }, { "metric", METRIC }, { "advert_metric", ADVERT_METRIC }, { "threshold", THRESHOLD }, { "rate_limit", RATE_LIMIT }, { "force_leaf", FORCE_LEAF }, { "srcrt", SRCRT }, { "sourceroute", SRCRT }, { "boundary", BOUNDARY }, { "netmask", NETMASK }, { "igmpv1", IGMPV1 }, { "altnet", ALTNET }, { "name", NAME }, { "accept", ACCEPT }, { "deny", DENY }, { "exact", EXACT }, { "bidir", BIDIR }, { "allow_nonpruners", ALLOW_NONPRUNERS }, #ifdef ALLOW_BLACK_HOLES { "allow_black_holes", BLACK_HOLE }, #endif { "noflood", NOFLOOD, NOFLOOD2}, { "notransit", NOTRANSIT }, { "blaster", BLASTER }, { "rexmit_prunes", REXMIT_PRUNES, REXMIT_PRUNES2 }, { "passive", PASSIVE }, { "beside", BESIDE }, #ifdef SNMP { "sysName", SYSNAM }, { "sysContact", SYSCONTACT }, { "sysVersion", SYSVERSION }, { "sysLocation", SYSLOCATION }, #endif { NULL, 0 } }; static int yylex() { int n; u_int32 addr; char *q; struct keyword *w; if ((q = next_word()) == NULL) { return 0; } for (w = words; w->word; w++) if (!strcmp(q, w->word)) return (state && w->val2) ? w->val2 : w->val1; if (!strcmp(q,"on") || !strcmp(q,"yes")) { yylval.num = 1; return BOOLEAN; } if (!strcmp(q,"off") || !strcmp(q,"no")) { yylval.num = 0; return BOOLEAN; } if (!strcmp(q,"default")) { yylval.addrmask.mask = 0; yylval.addrmask.addr = 0; return ADDRMASK; } if (sscanf(q,"%[.0-9]/%d%c",s1,&n,s2) == 2) { if ((addr = inet_parse(s1,1)) != 0xffffffff) { yylval.addrmask.mask = n; yylval.addrmask.addr = addr; return ADDRMASK; } /* fall through to returning STRING */ } if (sscanf(q,"%[.0-9]%c",s1,s2) == 1) { if ((addr = inet_parse(s1,4)) != 0xffffffff && inet_valid_host(addr)) { yylval.addr = addr; return ADDR; } } if (sscanf(q,"0x%8x%c",&n,s1) == 1) { yylval.addr = n; return ADDR; } if (sscanf(q,"%d%c",&n,s1) == 1) { yylval.num = n; return NUMBER; } #ifdef SNMP if (*q=='"') { if (q[ strlen(q)-1 ]=='"') q[ strlen(q)-1 ]='\0'; /* trash trailing quote */ yylval.ptr = q+1; return STRING; } #endif yylval.ptr = q; return STRING; } void config_vifs_from_file() { order = 0; state = 0; numbounds = 0; lineno = 0; if ((f = fopen(configfilename, "r")) == NULL) { if (errno != ENOENT) log(LOG_ERR, errno, "can't open %s", configfilename); return; } yyparse(); fclose(f); } static u_int32 valid_if(s) char *s; { register vifi_t vifi; register struct uvif *v; for (vifi=0, v=uvifs; vifiuv_name, s)) return v->uv_lcl_addr; return 0; } static struct ifreq * ifconfaddr(ifcp, a) struct ifconf *ifcp; u_int32 a; { int n; struct ifreq *ifrp = (struct ifreq *)ifcp->ifc_buf; struct ifreq *ifend = (struct ifreq *)((char *)ifrp + ifcp->ifc_len); while (ifrp < ifend) { if (ifrp->ifr_addr.sa_family == AF_INET && ((struct sockaddr_in *)&ifrp->ifr_addr)->sin_addr.s_addr == a) return (ifrp); #ifdef HAVE_SA_LEN n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); if (n < sizeof(*ifrp)) ++ifrp; else ifrp = (struct ifreq *)((char *)ifrp + n); #else ++ifrp; #endif } return (0); }