/* $NetBSD: parms.c,v 1.14 2000/07/21 00:22:38 thorpej Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software * must display the following acknowledgment: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. */ #if !defined(lint) && !defined(sgi) && !defined(__NetBSD__) static char sccsid[] __attribute__((unused)) = "@(#)if.c 8.1 (Berkeley) 6/5/93"; #elif defined(__NetBSD__) #include __RCSID("$NetBSD: parms.c,v 1.14 2000/07/21 00:22:38 thorpej Exp $"); #endif #include "defs.h" #include "pathnames.h" #include struct parm *parms; struct intnet *intnets; struct r1net *r1nets; struct tgate *tgates; /* use configured parameters */ void get_parms(struct interface *ifp) { static int warned_auth_in, warned_auth_out; struct parm *parmp; int i, num_passwds = 0; /* get all relevant parameters */ for (parmp = parms; parmp != 0; parmp = parmp->parm_next) { if (parmp->parm_name[0] == '\0' || !strcmp(ifp->int_name, parmp->parm_name) || (parmp->parm_name[0] == '\n' && on_net(ifp->int_addr, parmp->parm_net, parmp->parm_mask))) { /* This group of parameters is relevant, * so get its settings */ ifp->int_state |= parmp->parm_int_state; for (i = 0; i < MAX_AUTH_KEYS; i++) { if (parmp->parm_auth[0].type == RIP_AUTH_NONE || num_passwds >= MAX_AUTH_KEYS) break; memcpy(&ifp->int_auth[num_passwds++], &parmp->parm_auth[i], sizeof(ifp->int_auth[0])); } if (parmp->parm_rdisc_pref != 0) ifp->int_rdisc_pref = parmp->parm_rdisc_pref; if (parmp->parm_rdisc_int != 0) ifp->int_rdisc_int = parmp->parm_rdisc_int; if (parmp->parm_d_metric != 0) ifp->int_d_metric = parmp->parm_d_metric; } } /* Set general defaults. * * Default poor-man's router discovery to a metric that will * be heard by old versions of `routed`. They ignored received * routes with metric 15. */ if ((ifp->int_state & IS_PM_RDISC) && ifp->int_d_metric == 0) ifp->int_d_metric = FAKE_METRIC; if (ifp->int_rdisc_int == 0) ifp->int_rdisc_int = DefMaxAdvertiseInterval; if (!(ifp->int_if_flags & IFF_MULTICAST) && !(ifp->int_state & IS_REMOTE)) ifp->int_state |= IS_BCAST_RDISC; if (ifp->int_if_flags & IFF_POINTOPOINT) { ifp->int_state |= IS_BCAST_RDISC; /* By default, point-to-point links should be passive * about router-discovery for the sake of demand-dialing. */ if (0 == (ifp->int_state & GROUP_IS_SOL_OUT)) ifp->int_state |= IS_NO_SOL_OUT; if (0 == (ifp->int_state & GROUP_IS_ADV_OUT)) ifp->int_state |= IS_NO_ADV_OUT; } if (0 != (ifp->int_state & (IS_PASSIVE | IS_REMOTE))) ifp->int_state |= IS_NO_RDISC; if (ifp->int_state & IS_PASSIVE) ifp->int_state |= IS_NO_RIP; if (!IS_RIP_IN_OFF(ifp->int_state) && ifp->int_auth[0].type != RIP_AUTH_NONE && !(ifp->int_state & IS_NO_RIPV1_IN) && !warned_auth_in) { msglog("Warning: RIPv1 input via %s" " will be accepted without authentication", ifp->int_name); warned_auth_in = 1; } if (!IS_RIP_OUT_OFF(ifp->int_state) && ifp->int_auth[0].type != RIP_AUTH_NONE && !(ifp->int_state & IS_NO_RIPV1_OUT)) { if (!warned_auth_out) { msglog("Warning: RIPv1 output via %s" " will be sent without authentication", ifp->int_name); warned_auth_out = 1; } } } /* Read a list of gateways from /etc/gateways and add them to our tables. * * This file contains a list of "remote" gateways. That is usually * a gateway which we cannot immediately determine if it is present or * not as we can do for those provided by directly connected hardware. * * If a gateway is marked "passive" in the file, then we assume it * does not understand RIP and assume it is always present. Those * not marked passive are treated as if they were directly connected * and assumed to be broken if they do not send us advertisements. * All remote interfaces are added to our list, and those not marked * passive are sent routing updates. * * A passive interface can also be local, hardware interface exempt * from RIP. */ void gwkludge(void) { FILE *fp; char *p, *lptr; const char *cp; char lbuf[200], net_host[5], dname[64+1+64+1]; char gname[GNAME_LEN+1], qual[9]; struct interface *ifp; naddr dst, netmask, gate; int metric, n, lnum; struct stat sb; u_int state; const char *type; fp = fopen(_PATH_GATEWAYS, "r"); if (fp == 0) return; if (0 > fstat(fileno(fp), &sb)) { msglog("could not stat() "_PATH_GATEWAYS); (void)fclose(fp); return; } for (lnum = 1; ; lnum++) { if (0 == fgets(lbuf, sizeof(lbuf), fp)) break; lptr = lbuf; while (*lptr == ' ') lptr++; p = lptr+strlen(lptr)-1; while (*p == '\n' || (*p == ' ' && (p == lptr+1 || *(p-1) != '\\'))) *p-- = '\0'; if (*lptr == '\0' /* ignore null and comment lines */ || *lptr == '#') continue; /* notice newfangled parameter lines */ if (strncasecmp("net", lptr, 3) && strncasecmp("host", lptr, 4)) { cp = parse_parms(lptr, (sb.st_uid == 0 && !(sb.st_mode&(S_IRWXG|S_IRWXO)))); if (cp != 0) msglog("%s in line %d of "_PATH_GATEWAYS, cp, lnum); continue; } /* {net | host} XX[/M] XX gateway XX metric DD [passive | external]\n */ qual[0] = '\0'; /* the '64' here must be GNAME_LEN */ n = sscanf(lptr, "%4s %129[^ \t] gateway" " %64[^ / \t] metric %u %8s\n", net_host, dname, gname, &metric, qual); if (n != 4 && n != 5) { msglog("bad "_PATH_GATEWAYS" entry \"%s\"; %d values", lptr, n); continue; } if (metric >= HOPCNT_INFINITY) { msglog("bad metric in "_PATH_GATEWAYS" entry \"%s\"", lptr); continue; } if (!strcasecmp(net_host, "host")) { if (!gethost(dname, &dst)) { msglog("bad host \"%s\" in "_PATH_GATEWAYS " entry \"%s\"", dname, lptr); continue; } netmask = HOST_MASK; } else if (!strcasecmp(net_host, "net")) { if (!getnet(dname, &dst, &netmask)) { msglog("bad net \"%s\" in "_PATH_GATEWAYS " entry \"%s\"", dname, lptr); continue; } if (dst == RIP_DEFAULT) { msglog("bad net \"%s\" in "_PATH_GATEWAYS " entry \"%s\"--cannot be default", dname, lptr); continue; } HTONL(dst); /* make network # into IP address */ } else { msglog("bad \"%s\" in "_PATH_GATEWAYS " entry \"%s\"", net_host, lptr); continue; } if (!gethost(gname, &gate)) { msglog("bad gateway \"%s\" in "_PATH_GATEWAYS " entry \"%s\"", gname, lptr); continue; } if (!strcasecmp(qual, type = "passive")) { /* Passive entries are not placed in our tables, * only the kernel's, so we don't copy all of the * external routing information within a net. * Internal machines should use the default * route to a suitable gateway (like us). */ state = IS_REMOTE | IS_PASSIVE; if (metric == 0) metric = 1; } else if (!strcasecmp(qual, type = "external")) { /* External entries are handled by other means * such as EGP, and are placed only in the daemon * tables to prevent overriding them with something * else. */ strcpy(qual,"external"); state = IS_REMOTE | IS_PASSIVE | IS_EXTERNAL; if (metric == 0) metric = 1; } else if (!strcasecmp(qual, "active") || qual[0] == '\0') { if (metric != 0) { /* Entries that are neither "passive" nor * "external" are "remote" and must behave * like physical interfaces. If they are not * heard from regularly, they are deleted. */ state = IS_REMOTE; type = "remote"; } else { /* "remote" entries with a metric of 0 * are aliases for our own interfaces */ state = IS_REMOTE | IS_PASSIVE | IS_ALIAS; type = "alias"; } } else { msglog("bad "_PATH_GATEWAYS" entry \"%s\";" " unknown type %s", lptr, qual); continue; } if (0 != (state & (IS_PASSIVE | IS_REMOTE))) state |= IS_NO_RDISC; if (state & IS_PASSIVE) state |= IS_NO_RIP; ifp = check_dup(gate,dst,netmask,0); if (ifp != 0) { msglog("duplicate "_PATH_GATEWAYS" entry \"%s\"",lptr); continue; } ifp = (struct interface *)rtmalloc(sizeof(*ifp), "gwkludge()"); memset(ifp, 0, sizeof(*ifp)); ifp->int_state = state; if (netmask == HOST_MASK) ifp->int_if_flags = IFF_POINTOPOINT | IFF_UP; else ifp->int_if_flags = IFF_UP; ifp->int_act_time = NEVER; ifp->int_addr = gate; ifp->int_dstaddr = dst; ifp->int_mask = netmask; ifp->int_ripv1_mask = netmask; ifp->int_std_mask = std_mask(gate); ifp->int_net = ntohl(dst); ifp->int_std_net = ifp->int_net & ifp->int_std_mask; ifp->int_std_addr = htonl(ifp->int_std_net); ifp->int_metric = metric; if (!(state & IS_EXTERNAL) && ifp->int_mask != ifp->int_std_mask) ifp->int_state |= IS_SUBNET; (void)sprintf(ifp->int_name, "%s(%s)", type, gname); ifp->int_index = -1; if_link(ifp); } /* After all of the parameter lines have been read, * apply them to any remote interfaces. */ for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { get_parms(ifp); tot_interfaces++; if (!IS_RIP_OFF(ifp->int_state)) rip_interfaces++; trace_if("Add", ifp); } (void)fclose(fp); } /* like strtok(), but honoring backslash and not changing the source string */ static int /* 0=ok, -1=bad */ parse_quote(char **linep, /* look here */ const char *delims, /* for these delimiters */ char *delimp, /* 0 or put found delimiter here */ char *buf, /* copy token to here */ int lim) /* at most this many bytes */ { char c = '\0', *pc; const char *p; pc = *linep; if (*pc == '\0') return -1; while (lim != 0) { c = *pc++; if (c == '\0') break; if (c == '\\' && *pc != '\0') { if ((c = *pc++) == 'n') { c = '\n'; } else if (c == 'r') { c = '\r'; } else if (c == 't') { c = '\t'; } else if (c == 'b') { c = '\b'; } else if (c >= '0' && c <= '7') { c -= '0'; if (*pc >= '0' && *pc <= '7') { c = (c<<3)+(*pc++ - '0'); if (*pc >= '0' && *pc <= '7') c = (c<<3)+(*pc++ - '0'); } } } else { for (p = delims; *p != '\0'; ++p) { if (*p == c) goto exit; } } *buf++ = c; --lim; } exit: if (lim == 0) return -1; *buf = '\0'; /* terminate copy of token */ if (delimp != 0) *delimp = c; /* return delimiter */ *linep = pc-1; /* say where we ended */ return 0; } /* Parse password timestamp */ static char * parse_ts(time_t *tp, char **valp, char *val0, char *delimp, char *buf, u_int bufsize) { struct tm tm; #if defined(sgi) || defined(__NetBSD__) char *ptr; #endif if (0 > parse_quote(valp, "| ,\n\r", delimp, buf,bufsize) || buf[bufsize-1] != '\0' || buf[bufsize-2] != '\0') { sprintf(buf,"bad timestamp %.25s", val0); return buf; } strcat(buf,"\n"); memset(&tm, 0, sizeof(tm)); #if defined(sgi) || defined(__NetBSD__) ptr = strptime(buf, "%y/%m/%d@%H:%M\n", &tm); if (ptr == NULL || *ptr != '\0') { sprintf(buf,"bad timestamp %.25s", val0); return buf; } #else if (5 != sscanf(buf, "%u/%u/%u@%u:%u\n", &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, &tm.tm_min) || tm.tm_mon < 1 || tm.tm_mon > 12 || tm.tm_mday < 1 || tm.tm_mday > 31) { sprintf(buf,"bad timestamp %.25s", val0); return buf; } tm.tm_mon--; if (tm.tm_year <= 37) /* assume small years are in the */ tm.tm_year += 100; /* 3rd millenium */ #endif if ((*tp = mktime(&tm)) == -1) { sprintf(buf,"bad timestamp %.25s", val0); return buf; } return 0; } /* Get a password, key ID, and expiration date in the format * passwd|keyID|year/mon/day@hour:min|year/mon/day@hour:min */ static const char * /* 0 or error message */ get_passwd(char *tgt, char *val, struct parm *parmp, u_int16_t type, int safe) /* 1=from secure file */ { static char buf[80]; char *val0, *p, delim; struct auth k, *ap, *ap2; int i; u_long l; if (!safe) return "ignore unsafe password"; for (ap = parmp->parm_auth, i = 0; ap->type != RIP_AUTH_NONE; i++, ap++) { if (i >= MAX_AUTH_KEYS) return "too many passwords"; } memset(&k, 0, sizeof(k)); k.type = type; k.end = -1-DAY; val0 = val; if (0 > parse_quote(&val, "| ,\n\r", &delim, (char *)k.key, sizeof(k.key))) return tgt; if (delim != '|') { if (type == RIP_AUTH_MD5) return "missing Keyid"; } else { val0 = ++val; buf[sizeof(buf)-1] = '\0'; if (0 > parse_quote(&val, "| ,\n\r", &delim, buf,sizeof(buf)) || buf[sizeof(buf)-1] != '\0' || (l = strtoul(buf,&p,0)) > 255 || *p != '\0') { sprintf(buf,"bad KeyID \"%.20s\"", val0); return buf; } for (ap2 = parmp->parm_auth; ap2 < ap; ap2++) { if (ap2->keyid == l) { sprintf(buf,"duplicate KeyID \"%.20s\"", val0); return buf; } } k.keyid = (int)l; if (delim == '|') { val0 = ++val; if (0 != (p = parse_ts(&k.start,&val,val0,&delim, buf,sizeof(buf)))) return p; if (delim != '|') return "missing second timestamp"; val0 = ++val; if (0 != (p = parse_ts(&k.end,&val,val0,&delim, buf,sizeof(buf)))) return p; if ((u_long)k.start > (u_long)k.end) { sprintf(buf,"out of order timestamp %.30s", val0); return buf; } } } if (delim != '\0') return tgt; memmove(ap, &k, sizeof(*ap)); return 0; } static const char * bad_str(const char *estr) { static char buf[100+8]; sprintf(buf, "bad \"%.100s\"", estr); return buf; } /* Parse a set of parameters for an interface. */ const char * /* 0 or error message */ parse_parms(char *line, int safe) /* 1=from secure file */ { #define PARS(str) (!strcasecmp(tgt, str)) #define PARSEQ(str) (!strncasecmp(tgt, str"=", sizeof(str))) #define CKF(g,b) {if (0 != (parm.parm_int_state & ((g) & ~(b)))) break; \ parm.parm_int_state |= (b);} struct parm parm; struct intnet *intnetp; struct r1net *r1netp; struct tgate *tg; naddr addr, mask; char delim, *val0 = 0, *tgt, *val, *p; const char *msg; char buf[BUFSIZ], buf2[BUFSIZ]; int i; /* "subnet=x.y.z.u/mask[,metric]" must be alone on the line */ if (!strncasecmp(line, "subnet=", sizeof("subnet=")-1) && *(val = &line[sizeof("subnet=")-1]) != '\0') { if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf))) return bad_str(line); intnetp = (struct intnet*)rtmalloc(sizeof(*intnetp), "parse_parms subnet"); intnetp->intnet_metric = 1; if (delim == ',') { intnetp->intnet_metric = (int)strtol(val+1,&p,0); if (*p != '\0' || intnetp->intnet_metric <= 0 || intnetp->intnet_metric >= HOPCNT_INFINITY) return bad_str(line); } if (!getnet(buf, &intnetp->intnet_addr, &intnetp->intnet_mask) || intnetp->intnet_mask == HOST_MASK || intnetp->intnet_addr == RIP_DEFAULT) { free(intnetp); return bad_str(line); } HTONL(intnetp->intnet_addr); intnetp->intnet_next = intnets; intnets = intnetp; return 0; } /* "ripv1_mask=x.y.z.u/mask1,mask2" must be alone on the line. * This requires that x.y.z.u/mask1 be considered a subnet of * x.y.z.u/mask2, as if x.y.z.u/mask2 were a class-full network. */ if (!strncasecmp(line, "ripv1_mask=", sizeof("ripv1_mask=")-1) && *(val = &line[sizeof("ripv1_mask=")-1]) != '\0') { if (0 > parse_quote(&val, ",", &delim, buf, sizeof(buf)) || delim == '\0') return bad_str(line); if ((i = (int)strtol(val+1, &p, 0)) <= 0 || i > 32 || *p != '\0') return bad_str(line); r1netp = (struct r1net *)rtmalloc(sizeof(*r1netp), "parse_parms ripv1_mask"); r1netp->r1net_mask = HOST_MASK << (32-i); if (!getnet(buf, &r1netp->r1net_net, &r1netp->r1net_match) || r1netp->r1net_net == RIP_DEFAULT || r1netp->r1net_mask > r1netp->r1net_match) { free(r1netp); return bad_str(line); } r1netp->r1net_next = r1nets; r1nets = r1netp; return 0; } memset(&parm, 0, sizeof(parm)); for (;;) { tgt = line + strspn(line, " ,\n\r"); if (*tgt == '\0' || *tgt == '#') break; line = tgt+strcspn(tgt, "= #,\n\r"); delim = *line; if (delim == '=') { val0 = ++line; if (0 > parse_quote(&line, " #,\n\r",&delim, buf,sizeof(buf))) return bad_str(tgt); } if (delim != '\0') { for (;;) { *line = '\0'; if (delim == '#') break; ++line; if (delim != ' ' || (delim = *line) != ' ') break; } } if (PARSEQ("if")) { if (parm.parm_name[0] != '\0' || strlen(buf) > IF_NAME_LEN) return bad_str(tgt); strcpy(parm.parm_name, buf); } else if (PARSEQ("addr")) { /* This is a bad idea, because the address based * sets of parameters cannot be checked for * consistency with the interface name parameters. * The parm_net stuff is needed to allow several * -F settings. */ if (!getnet(val0, &addr, &mask) || parm.parm_name[0] != '\0') return bad_str(tgt); parm.parm_net = addr; parm.parm_mask = mask; parm.parm_name[0] = '\n'; } else if (PARSEQ("passwd")) { /* since cleartext passwords are so weak allow * them anywhere */ msg = get_passwd(tgt,val0,&parm,RIP_AUTH_PW,1); if (msg) { *val0 = '\0'; return bad_str(msg); } } else if (PARSEQ("md5_passwd")) { msg = get_passwd(tgt,val0,&parm,RIP_AUTH_MD5,safe); if (msg) { *val0 = '\0'; return bad_str(msg); } } else if (PARS("no_ag")) { parm.parm_int_state |= (IS_NO_AG | IS_NO_SUPER_AG); } else if (PARS("no_super_ag")) { parm.parm_int_state |= IS_NO_SUPER_AG; } else if (PARS("no_ripv1_in")) { parm.parm_int_state |= IS_NO_RIPV1_IN; } else if (PARS("no_ripv2_in")) { parm.parm_int_state |= IS_NO_RIPV2_IN; } else if (PARS("ripv2_out")) { if (parm.parm_int_state & IS_NO_RIPV2_OUT) return bad_str(tgt); parm.parm_int_state |= IS_NO_RIPV1_OUT; } else if (PARS("ripv2")) { if ((parm.parm_int_state & IS_NO_RIPV2_OUT) || (parm.parm_int_state & IS_NO_RIPV2_IN)) return bad_str(tgt); parm.parm_int_state |= (IS_NO_RIPV1_IN | IS_NO_RIPV1_OUT); } else if (PARS("no_rip")) { CKF(IS_PM_RDISC, IS_NO_RIP); } else if (PARS("no_rip_mcast")) { parm.parm_int_state |= IS_NO_RIP_MCAST; } else if (PARS("no_rdisc")) { CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); } else if (PARS("no_solicit")) { CKF(GROUP_IS_SOL_OUT, IS_NO_SOL_OUT); } else if (PARS("send_solicit")) { CKF(GROUP_IS_SOL_OUT, IS_SOL_OUT); } else if (PARS("no_rdisc_adv")) { CKF(GROUP_IS_ADV_OUT, IS_NO_ADV_OUT); } else if (PARS("rdisc_adv")) { CKF(GROUP_IS_ADV_OUT, IS_ADV_OUT); } else if (PARS("bcast_rdisc")) { parm.parm_int_state |= IS_BCAST_RDISC; } else if (PARS("passive")) { CKF((GROUP_IS_SOL_OUT|GROUP_IS_ADV_OUT), IS_NO_RDISC); parm.parm_int_state |= IS_NO_RIP | IS_PASSIVE; } else if (PARSEQ("rdisc_pref")) { if (parm.parm_rdisc_pref != 0 || (parm.parm_rdisc_pref = (int)strtol(buf,&p,0), *p != '\0')) return bad_str(tgt); } else if (PARS("pm_rdisc")) { if (IS_RIP_OUT_OFF(parm.parm_int_state)) return bad_str(tgt); parm.parm_int_state |= IS_PM_RDISC; } else if (PARSEQ("rdisc_interval")) { if (parm.parm_rdisc_int != 0 || (parm.parm_rdisc_int = (int)strtoul(buf,&p,0), *p != '\0') || parm.parm_rdisc_int < MinMaxAdvertiseInterval || parm.parm_rdisc_int > MaxMaxAdvertiseInterval) return bad_str(tgt); } else if (PARSEQ("fake_default")) { if (parm.parm_d_metric != 0 || IS_RIP_OUT_OFF(parm.parm_int_state) || (parm.parm_d_metric = (int)strtoul(buf,&p,0), *p != '\0') || parm.parm_d_metric > HOPCNT_INFINITY-1) return bad_str(tgt); } else if (PARSEQ("trust_gateway")) { /* look for trust_gateway=x.y.z|net/mask|...) */ p = buf; if (0 > parse_quote(&p, "|", &delim, buf2, sizeof(buf2)) || !gethost(buf2,&addr)) return bad_str(tgt); tg = (struct tgate *)rtmalloc(sizeof(*tg), "parse_parms" "trust_gateway"); memset(tg, 0, sizeof(*tg)); tg->tgate_addr = addr; i = 0; /* The default is to trust all routes. */ while (delim == '|') { p++; if (i >= MAX_TGATE_NETS || 0 > parse_quote(&p, "|", &delim, buf2, sizeof(buf2)) || !getnet(buf2, &tg->tgate_nets[i].net, &tg->tgate_nets[i].mask) || tg->tgate_nets[i].net == RIP_DEFAULT || tg->tgate_nets[i].mask == 0) return bad_str(tgt); i++; } tg->tgate_next = tgates; tgates = tg; parm.parm_int_state |= IS_DISTRUST; } else if (PARS("redirect_ok")) { parm.parm_int_state |= IS_REDIRECT_OK; } else { return bad_str(tgt); /* error */ } } return check_parms(&parm); #undef PARS #undef PARSEQ } /* check for duplicate parameter specifications */ const char * /* 0 or error message */ check_parms(struct parm *new) { struct parm *parmp, **parmpp; int i, num_passwds; /* set implicit values */ if (new->parm_int_state & IS_NO_ADV_IN) new->parm_int_state |= IS_NO_SOL_OUT; if (new->parm_int_state & IS_NO_SOL_OUT) new->parm_int_state |= IS_NO_ADV_IN; for (i = num_passwds = 0; i < MAX_AUTH_KEYS; i++) { if (new->parm_auth[i].type != RIP_AUTH_NONE) num_passwds++; } /* compare with existing sets of parameters */ for (parmpp = &parms; (parmp = *parmpp) != 0; parmpp = &parmp->parm_next) { if (strcmp(new->parm_name, parmp->parm_name)) continue; if (!on_net(htonl(parmp->parm_net), new->parm_net, new->parm_mask) && !on_net(htonl(new->parm_net), parmp->parm_net, parmp->parm_mask)) continue; for (i = 0; i < MAX_AUTH_KEYS; i++) { if (parmp->parm_auth[i].type != RIP_AUTH_NONE) num_passwds++; } if (num_passwds > MAX_AUTH_KEYS) return "too many conflicting passwords"; if ((0 != (new->parm_int_state & GROUP_IS_SOL_OUT) && 0 != (parmp->parm_int_state & GROUP_IS_SOL_OUT) && 0 != ((new->parm_int_state ^ parmp->parm_int_state) && GROUP_IS_SOL_OUT)) || (0 != (new->parm_int_state & GROUP_IS_ADV_OUT) && 0 != (parmp->parm_int_state & GROUP_IS_ADV_OUT) && 0 != ((new->parm_int_state ^ parmp->parm_int_state) && GROUP_IS_ADV_OUT)) || (new->parm_rdisc_pref != 0 && parmp->parm_rdisc_pref != 0 && new->parm_rdisc_pref != parmp->parm_rdisc_pref) || (new->parm_rdisc_int != 0 && parmp->parm_rdisc_int != 0 && new->parm_rdisc_int != parmp->parm_rdisc_int)) { return ("conflicting, duplicate router discovery" " parameters"); } if (new->parm_d_metric != 0 && parmp->parm_d_metric != 0 && new->parm_d_metric != parmp->parm_d_metric) { return ("conflicting, duplicate poor man's router" " discovery or fake default metric"); } } /* link new entry on the so that when the entries are scanned, * they affect the result in the order the operator specified. */ parmp = (struct parm*)rtmalloc(sizeof(*parmp), "check_parms"); memcpy(parmp, new, sizeof(*parmp)); *parmpp = parmp; return 0; } /* get a network number as a name or a number, with an optional "/xx" * netmask. */ int /* 0=bad */ getnet(char *name, naddr *netp, /* network in host byte order */ naddr *maskp) /* masks are always in host order */ { int i; struct netent *np; naddr mask; /* in host byte order */ struct in_addr in; /* a network and so host byte order */ char hname[MAXHOSTNAMELEN+1]; char *mname, *p; /* Detect and separate "1.2.3.4/24" */ if (0 != (mname = strrchr(name,'/'))) { i = (int)(mname - name); if (i > (int)sizeof(hname)-1) /* name too long */ return 0; memmove(hname, name, i); hname[i] = '\0'; mname++; name = hname; } np = getnetbyname(name); if (np != 0) { in.s_addr = (naddr)np->n_net; if (0 == (in.s_addr & 0xff000000)) in.s_addr <<= 8; if (0 == (in.s_addr & 0xff000000)) in.s_addr <<= 8; if (0 == (in.s_addr & 0xff000000)) in.s_addr <<= 8; } else if (inet_aton(name, &in) == 1) { NTOHL(in.s_addr); } else if (!mname && !strcasecmp(name,"default")) { in.s_addr = RIP_DEFAULT; } else { return 0; } if (!mname) { /* we cannot use the interfaces here because we have not * looked at them yet. */ mask = std_mask(htonl(in.s_addr)); if ((~mask & in.s_addr) != 0) mask = HOST_MASK; } else { mask = (naddr)strtoul(mname, &p, 0); if (*p != '\0' || mask > 32) return 0; if (mask != 0) mask = HOST_MASK << (32-mask); } /* must have mask of 0 with default */ if (mask != 0 && in.s_addr == RIP_DEFAULT) return 0; /* no host bits allowed in a network number */ if ((~mask & in.s_addr) != 0) return 0; /* require non-zero network number */ if ((mask & in.s_addr) == 0 && in.s_addr != RIP_DEFAULT) return 0; if (in.s_addr>>24 == 0 && in.s_addr != RIP_DEFAULT) return 0; if (in.s_addr>>24 == 0xff) return 0; *netp = in.s_addr; *maskp = mask; return 1; } int /* 0=bad */ gethost(char *name, naddr *addrp) { struct hostent *hp; struct in_addr in; /* Try for a number first, even in IRIX where gethostbyname() * is smart. This avoids hitting the name server which * might be sick because routing is. */ if (inet_aton(name, &in) == 1) { /* get a good number, but check that it it makes some * sense. */ if (ntohl(in.s_addr)>>24 == 0 || ntohl(in.s_addr)>>24 == 0xff) return 0; *addrp = in.s_addr; return 1; } hp = gethostbyname(name); if (hp) { memcpy(addrp, hp->h_addr, sizeof(*addrp)); return 1; } return 0; }