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IABSD.fr/src/usr.sbin/mrouted/cfparse.y
benno
- usr.sbin/mrouted/cfparse.y
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%{ /* $NetBSD: cfparse.y,v 1.4 1995/12/10 10:06:57 mycroft Exp $ */ /* * Configuration file parser for mrouted. * * Written by Bill Fenner, NRL, 1994 * Copyright (c) 1994 * Naval Research Laboratory (NRL/CCS) * and the * Defense Advanced Research Projects Agency (DARPA) * * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright notice and * this permission notice appear in all copies of the software, derivative * works or modified versions, and any portions thereof, and that both notices * appear in supporting documentation. * * NRL AND DARPA ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION AND * DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM * THE USE OF THIS SOFTWARE. */ #include <stdio.h> #include <string.h> #include <stdarg.h> #include "defs.h" #include <netdb.h> #include <ifaddrs.h> /* * Local function declarations */ static void fatal(const char *fmt, ...) __attribute__((__format__ (printf, 1, 2))) __attribute__((__nonnull__ (1))); static void warn(const char *fmt, ...) __attribute__((__format__ (printf, 1, 2))) __attribute__((__nonnull__ (1))); static void yyerror(char *s); static char * next_word(void); static int yylex(void); static u_int32_t valid_if(char *s); static const char * ifconfaddr(u_int32_t a); int yyparse(void); static FILE *f; extern int udp_socket; char *configfilename = _PATH_MROUTED_CONF; extern int cache_lifetime; extern int max_prune_lifetime; static int lineno; static struct uvif *v; static int order; struct addrmask { u_int32_t 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_t addr; }; %token CACHE_LIFETIME PRUNING %token PHYINT TUNNEL NAME %token DISABLE IGMPV1 SRCRT %token METRIC THRESHOLD RATE_LIMIT BOUNDARY NETMASK ALTNET %token <num> BOOLEAN %token <num> NUMBER %token <ptr> STRING %token <addrmask> ADDRMASK %token <addr> ADDR %type <addr> interface addrname %type <addrmask> bound boundary addrmask %start conf %% conf : stmts ; stmts : /* Empty */ | stmts stmt ; stmt : error | PHYINT interface { vifi_t vifi; 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 { const char *ifname; struct ifreq ffr; vifi_t vifi; order++; ifname = ifconfaddr($2); if (ifname == 0) fatal("Tunnel local address %s is not mine", inet_fmt($2, s1)); strlcpy(ffr.ifr_name, ifname, sizeof(ffr.ifr_name)); if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ffr) == -1) fatal("ioctl SIOCGIFFLAGS on %s",ffr.ifr_name); if (ffr.ifr_flags & IFF_LOOPBACK) fatal("Tunnel local address %s is a loopback interface", inet_fmt($2, s1)); if (ifconfaddr($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", inet_fmt($3,s1)); } if (numvifs == MAXVIFS) fatal("too many vifs"); v = &uvifs[numvifs]; v->uv_flags = VIFF_TUNNEL; v->uv_metric = DEFAULT_METRIC; v->uv_rate_limit= DEFAULT_TUN_RATE_LIMIT; v->uv_threshold = DEFAULT_THRESHOLD; v->uv_lcl_addr = $2; v->uv_rmt_addr = $3; v->uv_subnet = 0; v->uv_subnetmask= 0; v->uv_subnetbcast= 0; strncpy(v->uv_name, ffr.ifr_name, IFNAMSIZ); v->uv_groups = NULL; v->uv_neighbors = NULL; v->uv_acl = NULL; v->uv_addrs = NULL; if (!(ffr.ifr_flags & IFF_UP)) { v->uv_flags |= VIFF_DOWN; vifs_down = TRUE; } } tunnelmods { logit(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; } | PRUNING BOOLEAN { pruning = $2; } | CACHE_LIFETIME NUMBER { cache_lifetime = $2; max_prune_lifetime = cache_lifetime * 2; } | NAME STRING boundary { if (numbounds >= MAXBOUNDS) { fatal("Too many named boundaries (max %d)", MAXBOUNDS); } boundlist[numbounds].name = strdup($2); boundlist[numbounds++].bound = $3; } ; tunnelmods : /* empty */ | tunnelmods tunnelmod ; tunnelmod : mod | 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_t 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 = 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"); } ; 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"); } | 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 = 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"); } ; 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) 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)) { $$ = boundlist[i].bound; break; } } if (i == numbounds) { fatal("Invalid boundary name %s",$1); } } ; boundary : ADDRMASK { if ((ntohl($1.addr) & 0xff000000) != 0xef000000) { fatal("Boundaries must be 239.x.x.x, not %s/%d", inet_fmt($1.addr, s1), $1.mask); } $$ = $1; } ; addrmask : ADDRMASK { $$ = $1; } | ADDR { $$.addr = $1; $$.mask = 0; } ; %% static void fatal(const char *fmt, ...) { va_list ap; char buf[200]; va_start(ap, fmt); vsnprintf(buf, sizeof buf, fmt, ap); va_end(ap); logit(LOG_ERR,0,"%s: %s near line %d", configfilename, buf, lineno); } static void warn(const char *fmt, ...) { va_list ap; char buf[200]; va_start(ap, fmt); vsnprintf(buf, sizeof buf, fmt, ap); va_end(ap); logit(LOG_WARNING,0,"%s: %s near line %d", configfilename, buf, lineno); } static void yyerror(s) char *s; { logit(LOG_ERR, 0, "%s: %s near line %d", configfilename, s, lineno); } static char * next_word() { static char buf[1024]; static char *p=NULL; extern FILE *f; 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; 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; } } static int yylex() { int n; u_int32_t addr; char *q; if ((q = next_word()) == NULL) { return 0; } if (!strcmp(q,"cache_lifetime")) return CACHE_LIFETIME; if (!strcmp(q,"pruning")) return PRUNING; if (!strcmp(q,"phyint")) return PHYINT; if (!strcmp(q,"tunnel")) return TUNNEL; if (!strcmp(q,"disable")) return DISABLE; if (!strcmp(q,"metric")) return METRIC; if (!strcmp(q,"threshold")) return THRESHOLD; if (!strcmp(q,"rate_limit")) return RATE_LIMIT; if (!strcmp(q,"srcrt") || !strcmp(q,"sourceroute")) return SRCRT; if (!strcmp(q,"boundary")) return BOUNDARY; if (!strcmp(q,"netmask")) return NETMASK; if (!strcmp(q,"igmpv1")) return IGMPV1; if (!strcmp(q,"altnet")) return ALTNET; if (!strcmp(q,"name")) return NAME; 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 (sscanf(q,"%[.0-9]/%d%c",s1,&n,s2) == 2) { if ((addr = inet_parse(s1)) != 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)) != 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; } yylval.ptr = q; return STRING; } void config_vifs_from_file() { extern FILE *f; order = 0; numbounds = 0; lineno = 0; if ((f = fopen(configfilename, "r")) == NULL) { if (errno != ENOENT) logit(LOG_ERR, errno, "can't open %s", configfilename); return; } yyparse(); fclose(f); } static u_int32_t valid_if(s) char *s; { register vifi_t vifi; register struct uvif *v; for (vifi=0, v=uvifs; vifi<numvifs; vifi++, v++) if (!strcmp(v->uv_name, s)) return v->uv_lcl_addr; return 0; } static const char * ifconfaddr(a) u_int32_t a; { static char ifname[IFNAMSIZ]; struct ifaddrs *ifap, *ifa; if (getifaddrs(&ifap) != 0) return (NULL); 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); }