/* $NetBSD: getnetnamadr.c,v 1.20 2000/12/20 20:51:08 christos Exp $ */ /* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro * Dep. Matematica Universidade de Coimbra, Portugal, Europe * * 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. */ /* * 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 acknowledgement: * 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. */ #include #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)getnetbyaddr.c 8.1 (Berkeley) 6/4/93"; static char sccsid_[] = "from getnetnamadr.c 1.4 (Coimbra) 93/06/03"; static char rcsid[] = "Id: getnetnamadr.c,v 8.8 1997/06/01 20:34:37 vixie Exp "; #else __RCSID("$NetBSD: getnetnamadr.c,v 1.20 2000/12/20 20:51:08 christos Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __STDC__ #include #else #include #endif #ifdef YP #include #include #include #endif #ifdef __weak_alias __weak_alias(getnetbyaddr,_getnetbyaddr) __weak_alias(getnetbyname,_getnetbyname) #endif extern int _net_stayopen; #define BYADDR 0 #define BYNAME 1 #define MAXALIASES 35 #if PACKETSZ > 1024 #define MAXPACKET PACKETSZ #else #define MAXPACKET 1024 #endif typedef union { HEADER hdr; u_char buf[MAXPACKET]; } querybuf; typedef union { long al; char ac; } align; #ifdef YP static char *__ypdomain; static char *__ypcurrent; static int __ypcurrentlen; #endif static struct netent net_entry; static char *net_aliases[MAXALIASES]; static struct netent *getnetanswer __P((querybuf *, int, int)); int _files_getnetbyaddr __P((void *, void *, va_list)); int _files_getnetbyname __P((void *, void *, va_list)); int _dns_getnetbyaddr __P((void *, void *, va_list)); int _dns_getnetbyname __P((void *, void *, va_list)); #ifdef YP int _yp_getnetbyaddr __P((void *, void *, va_list)); int _yp_getnetbyname __P((void *, void *, va_list)); struct netent *_ypnetent __P((char *)); #endif static struct netent * getnetanswer(answer, anslen, net_i) querybuf *answer; int anslen; int net_i; { HEADER *hp; u_char *cp; int n; u_char *eom; int type, class, buflen, ancount, qdcount, haveanswer, i, nchar; char aux1[30], aux2[30], ans[30], *in, *st, *pauxt, *bp, **ap, *paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0; static char netbuf[PACKETSZ]; _DIAGASSERT(answer != NULL); /* * find first satisfactory answer * * answer --> +------------+ ( MESSAGE ) * | Header | * +------------+ * | Question | the question for the name server * +------------+ * | Answer | RRs answering the question * +------------+ * | Authority | RRs pointing toward an authority * | Additional | RRs holding additional information * +------------+ */ eom = answer->buf + anslen; hp = &answer->hdr; ancount = ntohs(hp->ancount); /* #/records in the answer section */ qdcount = ntohs(hp->qdcount); /* #/entries in the question section */ bp = netbuf; buflen = sizeof(netbuf); cp = answer->buf + HFIXEDSZ; if (!qdcount) { if (hp->aa) h_errno = HOST_NOT_FOUND; else h_errno = TRY_AGAIN; return (NULL); } while (qdcount-- > 0) cp += __dn_skipname(cp, eom) + QFIXEDSZ; ap = net_aliases; *ap = NULL; net_entry.n_aliases = net_aliases; haveanswer = 0; while (--ancount >= 0 && cp < eom) { n = dn_expand(answer->buf, eom, cp, bp, buflen); if ((n < 0) || !res_dnok(bp)) break; cp += n; ans[0] = '\0'; (void)strcpy(&ans[0], bp); GETSHORT(type, cp); GETSHORT(class, cp); cp += INT32SZ; /* TTL */ GETSHORT(n, cp); if (class == C_IN && type == T_PTR) { n = dn_expand(answer->buf, eom, cp, bp, buflen); if ((n < 0) || !res_hnok(bp)) { cp += n; return (NULL); } cp += n; *ap++ = bp; bp += strlen(bp) + 1; net_entry.n_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC; haveanswer++; } } if (haveanswer) { *ap = NULL; switch (net_i) { case BYADDR: net_entry.n_name = *net_entry.n_aliases; net_entry.n_net = 0L; break; case BYNAME: in = *net_entry.n_aliases; net_entry.n_name = &ans[0]; aux2[0] = '\0'; for (i = 0; i < 4; i++) { for (st = in, nchar = 0; *st != '.'; st++, nchar++) ; if (nchar != 1 || *in != '0' || flag) { flag = 1; (void)strncpy(paux1, (i==0) ? in : in-1, (size_t)((i==0) ? nchar : nchar+1)); paux1[(i==0) ? nchar : nchar+1] = '\0'; pauxt = paux2; paux2 = strcat(paux1, paux2); paux1 = pauxt; } in = ++st; } net_entry.n_net = inet_network(paux2); break; } net_entry.n_aliases++; return (&net_entry); } h_errno = TRY_AGAIN; return (NULL); } /*ARGSUSED*/ int _files_getnetbyaddr(rv, cb_data, ap) void *rv; void *cb_data; va_list ap; { struct netent *p; unsigned long net; int type; _DIAGASSERT(rv != NULL); net = va_arg(ap, unsigned long); type = va_arg(ap, int); setnetent(_net_stayopen); while ((p = getnetent()) != NULL) if (p->n_addrtype == type && p->n_net == net) break; if (!_net_stayopen) endnetent(); *((struct netent **)rv) = p; if (p==NULL) { h_errno = HOST_NOT_FOUND; return NS_NOTFOUND; } return NS_SUCCESS; } /*ARGSUSED*/ int _dns_getnetbyaddr(rv, cb_data, ap) void *rv; void *cb_data; va_list ap; { unsigned int netbr[4]; int nn, anslen; querybuf buf; char qbuf[MAXDNAME]; unsigned long net2; struct netent *np; unsigned long net; int type; _DIAGASSERT(rv != NULL); net = va_arg(ap, unsigned long); type = va_arg(ap, int); if (type != AF_INET) return NS_UNAVAIL; for (nn = 4, net2 = net; net2; net2 >>= 8) netbr[--nn] = (unsigned int)(net2 & 0xff); switch (nn) { default: return NS_UNAVAIL; case 3: /* Class A */ sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]); break; case 2: /* Class B */ sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]); break; case 1: /* Class C */ sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2], netbr[1]); break; case 0: /* Class D - E */ sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2], netbr[1], netbr[0]); break; } anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, sizeof(buf)); if (anslen < 0) { #ifdef DEBUG if (_res.options & RES_DEBUG) printf("res_query failed\n"); #endif return NS_NOTFOUND; } np = getnetanswer(&buf, anslen, BYADDR); if (np) { /* maybe net should be unsigned? */ unsigned long u_net = net; /* Strip trailing zeros */ while ((u_net & 0xff) == 0 && u_net != 0) u_net >>= 8; np->n_net = u_net; } *((struct netent **)rv) = np; if (np == NULL) { h_errno = HOST_NOT_FOUND; return NS_NOTFOUND; } return NS_SUCCESS; } struct netent * getnetbyaddr(net, net_type) u_long net; int net_type; { struct netent *np; static const ns_dtab dtab[] = { NS_FILES_CB(_files_getnetbyaddr, NULL) { NSSRC_DNS, _dns_getnetbyaddr, NULL }, /* force -DHESIOD */ NS_NIS_CB(_yp_getnetbyaddr, NULL) { 0 } }; if ((_res.options & RES_INIT) == 0 && res_init() == -1) { h_errno = NETDB_INTERNAL; return (NULL); } np = NULL; h_errno = NETDB_INTERNAL; if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyaddr", __nsdefaultsrc, net, net_type) != NS_SUCCESS) return (NULL); h_errno = NETDB_SUCCESS; return (np); } /*ARGSUSED*/ int _files_getnetbyname(rv, cb_data, ap) void *rv; void *cb_data; va_list ap; { struct netent *p; char **cp; const char *name; _DIAGASSERT(rv != NULL); name = va_arg(ap, const char *); setnetent(_net_stayopen); while ((p = getnetent()) != NULL) { if (strcasecmp(p->n_name, name) == 0) break; for (cp = p->n_aliases; *cp != 0; cp++) if (strcasecmp(*cp, name) == 0) goto found; } found: if (!_net_stayopen) endnetent(); *((struct netent **)rv) = p; if (p==NULL) { h_errno = HOST_NOT_FOUND; return NS_NOTFOUND; } return NS_SUCCESS; } /*ARGSUSED*/ int _dns_getnetbyname(rv, cb_data, ap) void *rv; void *cb_data; va_list ap; { int anslen; querybuf buf; char qbuf[MAXDNAME]; struct netent *np; const char *net; _DIAGASSERT(rv != NULL); net = va_arg(ap, const char *); strcpy(&qbuf[0], net); anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, sizeof(buf)); if (anslen < 0) { #ifdef DEBUG if (_res.options & RES_DEBUG) printf("res_query failed\n"); #endif return NS_NOTFOUND; } np = getnetanswer(&buf, anslen, BYNAME); *((struct netent **)rv) = np; if (np == NULL) { h_errno = HOST_NOT_FOUND; return NS_NOTFOUND; } return NS_SUCCESS; } struct netent * getnetbyname(net) const char *net; { struct netent *np; static const ns_dtab dtab[] = { NS_FILES_CB(_files_getnetbyname, NULL) { NSSRC_DNS, _dns_getnetbyname, NULL }, /* force -DHESIOD */ NS_NIS_CB(_yp_getnetbyname, NULL) { 0 } }; _DIAGASSERT(net != NULL); if ((_res.options & RES_INIT) == 0 && res_init() == -1) { h_errno = NETDB_INTERNAL; return (NULL); } np = NULL; h_errno = NETDB_INTERNAL; if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyname", __nsdefaultsrc, net) != NS_SUCCESS) return (NULL); h_errno = NETDB_SUCCESS; return (np); } #ifdef YP /*ARGSUSED*/ int _yp_getnetbyaddr(rv, cb_data, ap) void *rv; void *cb_data; va_list ap; { struct netent *np; char qbuf[MAXDNAME]; unsigned int netbr[4]; unsigned long net, net2; int type, r; _DIAGASSERT(rv != NULL); net = va_arg(ap, unsigned long); type = va_arg(ap, int); if (type != AF_INET) return NS_UNAVAIL; if (!__ypdomain) { if (_yp_check(&__ypdomain) == 0) return NS_UNAVAIL; } np = NULL; if (__ypcurrent) free(__ypcurrent); __ypcurrent = NULL; for (r = 4, net2 = net; net2; net2 >>= 8) netbr[--r] = (unsigned int)(net2 & 0xff); switch (r) { default: return NS_UNAVAIL; case 3: /* Class A */ sprintf(qbuf, "%u", netbr[0]); break; case 2: /* Class B */ sprintf(qbuf, "%u.%u", netbr[0], netbr[1]); break; case 1: /* Class C */ sprintf(qbuf, "%u.%u.%u", netbr[0], netbr[1], netbr[2]); break; case 0: /* Class D - E */ sprintf(qbuf, "%u.%u.%u.%u", netbr[0], netbr[1], netbr[2], netbr[3]); break; } r = yp_match(__ypdomain, "networks.byaddr", qbuf, (int)strlen(qbuf), &__ypcurrent, &__ypcurrentlen); if (r == 0) np = _ypnetent(__ypcurrent); *((struct netent **)rv) = np; if (np == NULL) { h_errno = HOST_NOT_FOUND; return NS_NOTFOUND; } return NS_SUCCESS; } int /*ARGSUSED*/ _yp_getnetbyname(rv, cb_data, ap) void *rv; void *cb_data; va_list ap; { struct netent *np; const char *name; int r; _DIAGASSERT(rv != NULL); name = va_arg(ap, const char *); if (!__ypdomain) { if (_yp_check(&__ypdomain) == 0) return NS_UNAVAIL; } np = NULL; if (__ypcurrent) free(__ypcurrent); __ypcurrent = NULL; r = yp_match(__ypdomain, "networks.byname", name, (int)strlen(name), &__ypcurrent, &__ypcurrentlen); if (r == 0) np = _ypnetent(__ypcurrent); *((struct netent **)rv) = np; if (np == NULL) { h_errno = HOST_NOT_FOUND; return NS_NOTFOUND; } return NS_SUCCESS; } struct netent * _ypnetent(line) char *line; { char *cp, *p, **q; _DIAGASSERT(line != NULL); net_entry.n_name = line; cp = strpbrk(line, " \t"); if (cp == NULL) return (NULL); *cp++ = '\0'; while (*cp == ' ' || *cp == '\t') cp++; p = strpbrk(cp, " \t"); if (p != NULL) *p++ = '\0'; net_entry.n_net = inet_network(cp); net_entry.n_addrtype = AF_INET; q = net_entry.n_aliases = net_aliases; if (p != NULL) { cp = p; while (cp && *cp) { if (*cp == ' ' || *cp == '\t') { cp++; continue; } if (q < &net_aliases[MAXALIASES - 1]) *q++ = cp; cp = strpbrk(cp, " \t"); if (cp != NULL) *cp++ = '\0'; } } *q = NULL; return (&net_entry); } #endif