diff options
Diffstat (limited to 'resolv')
| -rw-r--r-- | resolv/Makefile | 5 | ||||
| -rw-r--r-- | resolv/arpa/nameser.h | 13 | ||||
| -rw-r--r-- | resolv/gethnamaddr.c | 736 | ||||
| -rw-r--r-- | resolv/getnetnamadr.c | 4 | ||||
| -rw-r--r-- | resolv/inet_addr.c | 14 | ||||
| -rw-r--r-- | resolv/inet_ntop.c | 189 | ||||
| -rw-r--r-- | resolv/inet_pton.c | 223 | ||||
| -rw-r--r-- | resolv/res_comp.c | 95 | ||||
| -rw-r--r-- | resolv/res_debug.c | 21 | ||||
| -rw-r--r-- | resolv/res_hconf.c | 566 | ||||
| -rw-r--r-- | resolv/res_hconf.h | 50 | ||||
| -rw-r--r-- | resolv/res_init.c | 24 | ||||
| -rw-r--r-- | resolv/resolv.h | 17 |
13 files changed, 1735 insertions, 222 deletions
diff --git a/resolv/Makefile b/resolv/Makefile index ebb8967155..58f32821fe 100644 --- a/resolv/Makefile +++ b/resolv/Makefile @@ -22,11 +22,12 @@ subdir := resolv headers := resolv.h netdb.h arpa/nameser.h sys/bitypes.h -distribute := ../conf/portability.h +distribute := ../conf/portability.h res_hconf.h routines := gethnamaddr getnetbyaddr getnetbyname getnetent getnetnamadr \ herror nsap_addr res_comp res_debug res_data res_init res_mkquery \ - res_query res_send sethostent inet_addr + res_query res_send sethostent inet_addr inet_ntop inet_pton \ + res_hconf include ../Rules diff --git a/resolv/arpa/nameser.h b/resolv/arpa/nameser.h index 3792b7963c..0fb04a1a02 100644 --- a/resolv/arpa/nameser.h +++ b/resolv/arpa/nameser.h @@ -3,7 +3,7 @@ * - * Copyright (c) 1983, 1989, 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: @@ -19,7 +19,7 @@ * 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 @@ -33,14 +33,14 @@ * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * + * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. - * + * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT @@ -97,7 +97,8 @@ #define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */ #define INT32SZ 4 /* for systems without 32-bit ints */ #define INT16SZ 2 /* for systems without 16-bit ints */ -#define INADDRSZ 4 /* for sizeof(struct inaddr) != 4 */ +#define INADDRSZ 4 /* IPv4 T_A */ +#define IN6ADDRSZ 16 /* IPv6 T_AAAA */ /* * Internet nameserver port number @@ -110,7 +111,7 @@ #define QUERY 0x0 /* standard query */ #define IQUERY 0x1 /* inverse query */ #define STATUS 0x2 /* nameserver status query */ -/*#define xxx 0x3 /* 0x3 reserved */ +/*#define xxx 0x3*/ /* 0x3 reserved */ #define NS_NOTIFY_OP 0x4 /* notify secondary of SOA change */ #ifdef ALLOW_UPDATES /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ diff --git a/resolv/gethnamaddr.c b/resolv/gethnamaddr.c index f108f2778f..b80595b7d5 100644 --- a/resolv/gethnamaddr.c +++ b/resolv/gethnamaddr.c @@ -3,7 +3,7 @@ * - * Copyright (c) 1985, 1988, 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: @@ -19,7 +19,7 @@ * 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 @@ -33,14 +33,14 @@ * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * + * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. - * + * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT @@ -71,13 +71,15 @@ static char rcsid[] = "$Id$"; #include <errno.h> #include <syslog.h> +#include "res_hconf.h" + #ifndef LOG_AUTH # define LOG_AUTH 0 #endif #define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */ -#if defined(BSD) && (BSD >= 199103) +#if defined(BSD) && (BSD >= 199103) && defined(AF_INET6) # include <string.h> #else # include "../conf/portability.h" @@ -88,6 +90,7 @@ static char rcsid[] = "$Id$"; #define MAXALIASES 35 #define MAXADDRS 35 +#define MAXADDRBUFSIZE 8192 static const char AskedForGot[] = "gethostby*.getanswer: asked for \"%s\", got \"%s\""; @@ -97,11 +100,14 @@ static struct hostent *gethostbyname_ipv4 __P((const char *)); static struct hostent host; static char *host_aliases[MAXALIASES]; -static char hostbuf[8*1024]; -static struct in_addr host_addr; +static char hostbuf[MAXADDRBUFSIZE]; +static u_char host_addr[16]; /* IPv4 or IPv6 */ static FILE *hostf = NULL; static int stayopen = 0; +static void map_v4v6_address __P((const char *src, char *dst)); +static void map_v4v6_hostent __P((struct hostent *hp, char **bp, int *len)); + #ifdef RESOLVSORT static void addrsort __P((char **, int)); #endif @@ -142,11 +148,11 @@ dprintf(msg, num) #endif static struct hostent * -getanswer(answer, anslen, qname, qclass, qtype) +getanswer(answer, anslen, qname, qtype) const querybuf *answer; int anslen; const char *qname; - int qclass, qtype; + int qtype; { register const HEADER *hp; register const u_char *cp; @@ -165,13 +171,14 @@ getanswer(answer, anslen, qname, qclass, qtype) eom = answer->buf + anslen; switch (qtype) { case T_A: + case T_AAAA: name_ok = res_hnok; break; case T_PTR: - name_ok = dn_isvalid; + name_ok = res_dnok; break; default: - abort(); + return (NULL); /* XXX should be abort(); */ } /* * find first satisfactory answer @@ -192,7 +199,7 @@ getanswer(answer, anslen, qname, qclass, qtype) return (NULL); } cp += n + QFIXEDSZ; - if (qtype == T_A) { + if (qtype == T_A || qtype == T_AAAA) { /* res_send() has already verified that the query name is the * same as the one we sent; this just gets the expanded name * (i.e., with the succeeding search-domain tacked on). @@ -209,9 +216,7 @@ getanswer(answer, anslen, qname, qclass, qtype) host.h_aliases = host_aliases; hap = h_addr_ptrs; *hap = NULL; -#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ host.h_addr_list = h_addr_ptrs; -#endif haveanswer = 0; had_error = 0; while (ancount-- > 0 && cp < eom && !had_error) { @@ -227,12 +232,12 @@ getanswer(answer, anslen, qname, qclass, qtype) cp += INT16SZ + INT32SZ; /* class, TTL */ n = _getshort(cp); cp += INT16SZ; /* len */ - if (class != qclass) { + if (class != C_IN) { /* XXX - debug? syslog? */ cp += n; continue; /* XXX - had_error++ ? */ } - if (qtype == T_A && type == T_CNAME) { + if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { if (ap >= &host_aliases[MAXALIASES-1]) continue; n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); @@ -241,12 +246,6 @@ getanswer(answer, anslen, qname, qclass, qtype) continue; } cp += n; - if (host.h_name && strcasecmp(host.h_name, bp) != 0) { - syslog(LOG_NOTICE|LOG_AUTH, - "gethostby*.getanswer: asked for \"%s\", got CNAME for \"%s\"", - host.h_name, bp); - continue; /* XXX - had_error++ ? */ - } /* Store alias. */ *ap++ = bp; n = strlen(bp) + 1; /* for the \0 */ @@ -286,7 +285,7 @@ getanswer(answer, anslen, qname, qclass, qtype) if (type != qtype) { syslog(LOG_NOTICE|LOG_AUTH, "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", - qname, p_class(qclass), p_type(qtype), + qname, p_class(C_IN), p_type(qtype), p_type(type)); cp += n; continue; /* XXX - had_error++ ? */ @@ -320,10 +319,17 @@ getanswer(answer, anslen, qname, qclass, qtype) break; #else host.h_name = bp; + if (_res.options & RES_USE_INET6) { + n = strlen(bp) + 1; /* for the \0 */ + bp += n; + buflen -= n; + map_v4v6_hostent(&host, &bp, &buflen); + } h_errno = NETDB_SUCCESS; return (&host); #endif case T_A: + case T_AAAA: if (strcasecmp(host.h_name, bp) != 0) { syslog(LOG_NOTICE|LOG_AUTH, AskedForGot, host.h_name, bp); @@ -338,10 +344,6 @@ getanswer(answer, anslen, qname, qclass, qtype) } else { register int nn; - host.h_length = n; - host.h_addrtype = (class == C_IN) - ? AF_INET - : AF_UNSPEC; host.h_name = bp; nn = strlen(bp) + 1; /* for the \0 */ bp += nn; @@ -367,13 +369,11 @@ getanswer(answer, anslen, qname, qclass, qtype) cp += n; break; default: - dprintf("Impossible condition (type=%d)\n", type); - h_errno = NO_RECOVERY; - return (NULL); - } /*switch*/ + abort(); + } if (!had_error) haveanswer++; - } /*while*/ + } if (haveanswer) { *ap = NULL; *hap = NULL; @@ -383,44 +383,39 @@ getanswer(answer, anslen, qname, qclass, qtype) * in its return structures - should give it the "best" * address in that case, not some random one */ - if (_res.nsort && haveanswer > 1 && - qclass == C_IN && qtype == T_A) + if (_res.nsort && haveanswer > 1 && qtype == T_A) addrsort(h_addr_ptrs, haveanswer); # endif /*RESOLVSORT*/ -#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ - /* nothing */ -#else - host.h_addr = h_addr_ptrs[0]; -#endif /*BSD*/ if (!host.h_name) { n = strlen(qname) + 1; /* for the \0 */ + if (n > buflen) + goto try_again; strcpy(bp, qname); host.h_name = bp; + bp += n; + buflen -= n; } + if (_res.options & RES_USE_INET6) + map_v4v6_hostent(&host, &bp, &buflen); h_errno = NETDB_SUCCESS; return (&host); - } else { - h_errno = TRY_AGAIN; - return (NULL); } + try_again: + h_errno = TRY_AGAIN; + return (NULL); } struct hostent * gethostbyname(name) const char *name; { - /* Moved #if line to here because declaring HP would lead to a - warning. --drepper@gnu */ -#if defined(AF_INET6) && defined(RES_TRY_INET6) struct hostent *hp; -/* #if defined(AF_INET6) && defined(RES_TRY_INET6) */ - if (_res.options & RES_TRY_INET6) { + if (_res.options & RES_USE_INET6) { hp = gethostbyname2(name, AF_INET6); if (hp) return (hp); } -#endif return (gethostbyname2(name, AF_INET)); } @@ -429,29 +424,35 @@ gethostbyname2(name, af) const char *name; int af; { - switch (af) { - case AF_INET: - return (gethostbyname_ipv4(name)); - } - errno = EAFNOSUPPORT; - h_errno = NETDB_INTERNAL; - return (NULL); -} - -static struct hostent * -gethostbyname_ipv4(name) - const char *name; -{ querybuf buf; register const char *cp; - int n; - extern struct hostent *_gethtbyname(); + char *bp; + int i, n, size, type, len; + extern struct hostent *_gethtbyname2(); if ((_res.options & RES_INIT) == 0 && res_init() == -1) { h_errno = NETDB_INTERNAL; return (NULL); } + switch (af) { + case AF_INET: + size = INADDRSZ; + type = T_A; + break; + case AF_INET6: + size = IN6ADDRSZ; + type = T_AAAA; + break; + default: + h_errno = NETDB_INTERNAL; + errno = EAFNOSUPPORT; + return (NULL); + } + + host.h_addrtype = af; + host.h_length = size; + /* * if there aren't any dots, it could be a user-level alias. * this is also done in res_query() since we are not the only @@ -474,117 +475,254 @@ gethostbyname_ipv4(name) * Fake up a hostent as if we'd actually * done a lookup. */ - if (!inet_aton(name, &host_addr)) { + if (inet_pton(af, name, host_addr, + sizeof host_addr) <= 0) { h_errno = HOST_NOT_FOUND; return (NULL); } strncpy(hostbuf, name, MAXDNAME); hostbuf[MAXDNAME] = '\0'; + bp = hostbuf + MAXDNAME; + len = sizeof hostbuf - MAXDNAME; host.h_name = hostbuf; host.h_aliases = host_aliases; host_aliases[0] = NULL; - host.h_addrtype = AF_INET; - host.h_length = INT32SZ; h_addr_ptrs[0] = (char *)&host_addr; h_addr_ptrs[1] = NULL; -#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ host.h_addr_list = h_addr_ptrs; -#else - host.h_addr = h_addr_ptrs[0]; -#endif + if (_res.options & RES_USE_INET6) + map_v4v6_hostent(&host, &bp, &len); h_errno = NETDB_SUCCESS; return (&host); } - if (!isdigit(*cp) && *cp != '.') + if (!isdigit(*cp) && *cp != '.') break; } - if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) { - dprintf("res_search failed (%d)\n", n); - if (errno == ECONNREFUSED) - return (_gethtbyname(name)); - return (NULL); + h_errno = HOST_NOT_FOUND; + for (i = 0; i < _res_hconf.num_services; ++i) { + struct hostent * hp; + char * cp = (char *) name; + + if (_res_hconf.num_trimdomains > 0) { + size_t name_len = strlen(name); + + cp = malloc(name_len + 1); + memcpy(cp, name, name_len + 1); + _res_hconf_trim_domain(cp); + } + + hp = NULL; + switch (_res_hconf.service[i]) { + case SERVICE_BIND: + if ((n = res_search(cp, C_IN, type, + buf.buf, sizeof(buf))) < 0) + { + dprintf("res_search failed (%d)\n", n); + break; + } + hp = getanswer(&buf, n, cp, type); + break; + + case SERVICE_HOSTS: + hp = _gethtbyname2(cp, af); + break; +#ifdef HAVE_NYS + case SERVICE_NIS: + hp = _getnishost(cp, "hosts.byname"); + break; +#endif + default: + break; + } + if (cp != name) + free(cp); + if (hp) { + if ((_res_hconf.flags & HCONF_FLAG_REORDER) + && hp->h_addr_list[0] && hp->h_addr_list[1]) + _res_hconf_reorder_addrs(hp); + _res_hconf_trim_domains(hp); + return hp; + } } - return (getanswer(&buf, n, name, C_IN, T_A)); + if (h_errno == NETDB_SUCCESS) + h_errno = HOST_NOT_FOUND; + return NULL; } struct hostent * -gethostbyaddr(addr, len, type) - const char *addr; - int len, type; +gethostbyaddr(addr, len, af) + const char *addr; /* XXX should have been def'd as u_char! */ + int len, af; { - int n; + const u_char *uaddr = (const u_char *)addr; + static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; + static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; + int n, size; querybuf buf; register struct hostent *hp; - char qbuf[MAXDNAME+1]; -#ifdef SUNSECURITY + char qbuf[MAXDNAME+1], *qp; register struct hostent *rhp; char **haddr; u_long old_options; char hname2[MAXDNAME+1]; -#endif /*SUNSECURITY*/ + int i, old_num_trimdomains; extern struct hostent *_gethtbyaddr(); - + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { h_errno = NETDB_INTERNAL; return (NULL); } - if (type != AF_INET || len != INADDRSZ) { + if (af == AF_INET6 && len == IN6ADDRSZ && + (!bcmp(uaddr, mapped, sizeof mapped) || + !bcmp(uaddr, tunnelled, sizeof tunnelled))) { + /* Unmap. */ + addr += sizeof mapped; + uaddr += sizeof mapped; + af = AF_INET; + len = INADDRSZ; + } + switch (af) { + case AF_INET: + size = INADDRSZ; + break; + case AF_INET6: + size = IN6ADDRSZ; + break; + default: errno = EAFNOSUPPORT; h_errno = NETDB_INTERNAL; return (NULL); } - (void)sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", - ((unsigned)addr[3] & 0xff), - ((unsigned)addr[2] & 0xff), - ((unsigned)addr[1] & 0xff), - ((unsigned)addr[0] & 0xff)); - n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf); - if (n < 0) { - dprintf("res_query failed (%d)\n", n); - if (errno == ECONNREFUSED) - return (_gethtbyaddr(addr, len, type)); - return (NULL); - } - if (!(hp = getanswer(&buf, n, qbuf, C_IN, T_PTR))) - return (NULL); /* h_errno was set by getanswer() */ -#ifdef SUNSECURITY - /* - * turn off search as the name should be absolute, - * 'localhost' should be matched by defnames - */ - strncpy(hname2, hp->h_name, MAXDNAME); - hname2[MAXDNAME] = '\0'; - old_options = _res.options; - _res.options &= ~RES_DNSRCH; - _res.options |= RES_DEFNAMES; - if (!(rhp = gethostbyname(hname2))) { - syslog(LOG_NOTICE|LOG_AUTH, - "gethostbyaddr: No A record for %s (verifying [%s])", - hname2, inet_ntoa(*((struct in_addr *)addr))); - _res.options = old_options; - h_errno = HOST_NOT_FOUND; + if (size != len) { + errno = EINVAL; + h_errno = NETDB_INTERNAL; return (NULL); } - _res.options = old_options; - for (haddr = rhp->h_addr_list; *haddr; haddr++) - if (!memcmp(*haddr, addr, INADDRSZ)) + + h_errno = NETDB_SUCCESS; + for (i = 0; i < _res_hconf.num_services; ++i) { + hp = NULL; + switch (_res_hconf.service[i]) { + case SERVICE_BIND: + switch (af) { + case AF_INET: + (void) sprintf(qbuf, + "%u.%u.%u.%u.in-addr.arpa", + (uaddr[3] & 0xff), + (uaddr[2] & 0xff), + (uaddr[1] & 0xff), + (uaddr[0] & 0xff)); + break; + case AF_INET6: + qp = qbuf; + for (n = IN6ADDRSZ - 1; n >= 0; n--) { + qp += sprintf(qp, "%x.%x.", + uaddr[n] & 0xf, + (uaddr[n] >> 4) & 0xf); + } + strcpy(qp, "ip6.int"); + break; + default: + abort(); + } + n = res_query(qbuf, C_IN, T_PTR, + (u_char *)buf.buf, sizeof buf.buf); + if (n < 0) { + dprintf("res_query failed (%d)\n", n); + break; + } + hp = getanswer(&buf, n, qbuf, T_PTR); + if (!hp) + break; /* h_errno was set by getanswer() */ + if (af == AF_INET + && (_res_hconf.flags & HCONF_FLAG_SPOOF)) { + /* + * Turn off search as the name should + * be absolute, 'localhost' should be + * matched by defnames + */ + strncpy(hname2, hp->h_name, MAXDNAME); + hname2[MAXDNAME] = '\0'; + old_options = _res.options; + /* + * Also turn off domain trimming to prevent it + * from causing the name comparison to fail. + */ + old_num_trimdomains = + _res_hconf.num_trimdomains; + _res.options &= ~RES_DNSRCH; + _res.options |= RES_DEFNAMES; + rhp = gethostbyname(hname2); + _res.options = old_options; + /* There must be an A record and + the names must match. */ + if (!rhp || strcmp(hname2, rhp->h_name)) { + syslog(LOG_NOTICE|LOG_AUTH, + "gethostbyaddr: No A record for" + " %s (verifying [%s])", + hname2, + inet_ntoa(*((struct in_addr *) + addr))); + h_errno = HOST_NOT_FOUND; + break; + } + for (haddr = rhp->h_addr_list; *haddr; haddr++) + if (!memcmp(*haddr, addr, INADDRSZ)) + break; + if (!*haddr) { + syslog(LOG_NOTICE|LOG_AUTH, + "gethostbyaddr: A record of %s" + " != PTR record [%s]", + hname2, + inet_ntoa(*((struct in_addr *) + addr))); + h_errno = HOST_NOT_FOUND; + break; + } + } + hp->h_addrtype = af; + hp->h_length = len; + bcopy(addr, host_addr, len); + h_addr_ptrs[0] = (char *)host_addr; + h_addr_ptrs[1] = NULL; + if (af == AF_INET && (_res.options & RES_USE_INET6)) { + map_v4v6_address((char*)host_addr, + (char*)host_addr); + hp->h_addrtype = AF_INET6; + hp->h_length = IN6ADDRSZ; + } + h_errno = NETDB_SUCCESS; break; - if (!*haddr) { - syslog(LOG_NOTICE|LOG_AUTH, - "gethostbyaddr: A record of %s != PTR record [%s]", - hname2, inet_ntoa(*((struct in_addr *)addr))); - h_errno = HOST_NOT_FOUND; - return (NULL); + + case SERVICE_HOSTS: + hp = _gethtbyaddr(addr, len, af); + break; + +#ifdef HAVE_NYS + case SERVICE_NIS: + if (af == AF_INET) { + sprintf(qbuf, "%u.%u.%u.%u", + (unsigned)addr[0] & 0xff, + (unsigned)addr[1] & 0xff, + (unsigned)addr[2] & 0xff, + (unsigned)addr[3] & 0xff); + hp = _getnishost(qbuf, "hosts.byaddr"); + } + break; +#endif + + default: + break; + } + if (hp) { + _res_hconf_trim_domains(hp); + return hp; + } } -#endif /*SUNSECURITY*/ - hp->h_addrtype = type; - hp->h_length = len; - h_addr_ptrs[0] = (char *)&host_addr; - h_addr_ptrs[1] = NULL; - host_addr = *(struct in_addr *)addr; - h_errno = NETDB_SUCCESS; - return (hp); + if (h_errno == NETDB_SUCCESS) + h_errno = HOST_NOT_FOUND; + return NULL; } void @@ -612,12 +750,13 @@ _gethtent() { char *p; register char *cp, **q; + int af, len; if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { h_errno = NETDB_INTERNAL; return (NULL); } -again: + again: if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { h_errno = HOST_NOT_FOUND; return (NULL); @@ -630,18 +769,27 @@ again: if (!(cp = strpbrk(p, " \t"))) goto again; *cp++ = '\0'; - /* THIS STUFF IS INTERNET SPECIFIC */ - if (!inet_aton(p, &host_addr)) + if ((_res.options & RES_USE_INET6) && + inet_pton(AF_INET6, p, host_addr, sizeof host_addr) > 0) { + af = AF_INET6; + len = IN6ADDRSZ; + } else if (inet_pton(AF_INET, p, host_addr, sizeof host_addr) > 0) { + if (_res.options & RES_USE_INET6) { + map_v4v6_address((char*)&host_addr, (char*)&host_addr); + af = AF_INET6; + len = IN6ADDRSZ; + } else { + af = AF_INET; + len = INADDRSZ; + } + } else { goto again; + } h_addr_ptrs[0] = (char *)&host_addr; h_addr_ptrs[1] = NULL; -#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ host.h_addr_list = h_addr_ptrs; -#else - host.h_addr = h_addr_ptrs[0]; -#endif - host.h_length = INT32SZ; - host.h_addrtype = AF_INET; + host.h_length = len; + host.h_addrtype = af; while (*cp == ' ' || *cp == '\t') cp++; host.h_name = cp; @@ -659,45 +807,275 @@ again: *cp++ = '\0'; } *q = NULL; + if (_res.options & RES_USE_INET6) { + char *bp = hostbuf; + int buflen = sizeof hostbuf; + + map_v4v6_hostent(&host, &bp, &buflen); + } h_errno = NETDB_SUCCESS; return (&host); } +struct hstorage { + char name[MAXHOSTNAMELEN + 1]; /* canonical name */ + char ** alp; /* address list pointer */ + char * abp; /* address buffer pointer */ + char * addr_list[MAXADDRS + 1]; /* address list storage */ + char addr_buf[MAXADDRBUFSIZE]; /* addresses storage */ +}; + +static void +append_addr (struct hstorage * hs, struct hostent *p) +{ + if (hs->alp < hs->addr_list + MAXADDRS + && hs->abp + p->h_length < hs->addr_buf + MAXADDRBUFSIZE) + { + hs->alp[0] = hs->abp; + hs->alp[1] = 0; + memcpy(hs->abp, p->h_addr_list[0], p->h_length); + hs->abp += p->h_length; + ++hs->alp; + } +} + +/* + * Lookup IP address and aliases for host NAME. If multiaddress mode + * is enabled, the entire /etc/hosts file is searched and the union of + * all addresses found for NAME is returned (this may be slow with + * large /etc/hosts files, but is convenient for smallish sites that + * don't want to go through the complexity of running named locally). + * If multiaddress mode is enabled, the address returned in + * h_addr_list[0] is one that is on the same net as one of the host's + * local addresses (if such an address exists). For compatibility + * with the BIND version of gethostbyname(), the alias field is empty + * unless the name being looked up is an alias itself. In the latter + * case, the name field contains the canonical name and the alias + * field the name that is being looked up. A difference from the BIND + * version is that this is true even if the alias applies only to one + * of the interfaces on the target host.o + */ struct hostent * _gethtbyname(name) - char *name; + const char *name; +{ + extern struct hostent *_gethtbyname2 __P((const char *, int)); + struct hostent *hp; + + if (_res.options & RES_USE_INET6) { + hp = _gethtbyname2(name, AF_INET6); + if (hp) + return (hp); + } + return (_gethtbyname2(name, AF_INET)); +} + +struct hostent * +_gethtbyname2(name, af) + const char *name; + int af; { register struct hostent *p; register char **cp; - + _sethtent(0); - while (p = _gethtent()) { - if (strcasecmp(p->h_name, name) == 0) - break; - for (cp = p->h_aliases; *cp != 0; cp++) - if (strcasecmp(*cp, name) == 0) - goto found; + + if (_res_hconf.flags & HCONF_FLAG_MULTI) { + /* + * More statics; not pretty, but it would require + * interface changes to make these functions + * reentrant. + */ + static char * aliases[2]; + static char alias[MAXHOSTNAMELEN + 1]; + static struct hstorage self, target; + static struct hostent ht; + int found; + + aliases[0] = aliases[1] = 0; + + gethostname(self.name, sizeof(self.name)); + self.alp = self.addr_list; + self.abp = self.addr_buf; + + strncpy(target.name, name, MAXHOSTNAMELEN); + target.name[MAXHOSTNAMELEN] = '\0'; + target.alp = target.addr_list; + target.abp = target.addr_buf; + + _sethtent(0); + while ((p = _gethtent()) != 0) { + found = 1; + + if (p->h_addrtype != af) + continue; + if (strcasecmp(p->h_name, name) != 0) { + found = 0; + for (cp = p->h_aliases; *cp; ++cp) + if (strcasecmp(*cp, name) == 0) { + found = 1; + if (!aliases[0]) { + strcpy(target.name, + p->h_name); + strncpy(alias, name, + MAXHOSTNAMELEN); + alias[MAXHOSTNAMELEN] + = '\0'; + aliases[0] = alias; + } + break; + } + } + if (found) { + /* they better be all the same type and length! */ + ht.h_addrtype = p->h_addrtype; + ht.h_length = p->h_length; + append_addr(&target, p); + /* + * If the current hostentry is for the target host, we don't + * check for the local host name. This nicely optimizes the + * case where NAME is a local name since address ordering + * doesn't matter in that case. + */ + continue; + } + found = 1; + if (strcasecmp(p->h_name, self.name) != 0) { + found = 0; + for (cp = p->h_aliases; *cp; ++cp) + if (strcasecmp(*cp, self.name) == 0) { + found = 1; + break; + } + } + if (found) { + append_addr(&self, p); + } + } + _endhtent(); + + if (target.alp == target.addr_list) + return NULL; /* found nothing */ + + ht.h_aliases = aliases; + ht.h_name = target.name; + ht.h_addr_list = target.addr_list; + /* + * XXX (davidm) Isn't this subsumed by REORDER??? + * + * Finding the `best' address is necessarily address + * specific. For now, we do IPv4 addresses only. + */ + if (af == AF_INET) { + u_int32_t a1, a2, diff, mindiff = ~0; + int i, j, bestaddr = 0; + + for (i = 0; self.addr_list[i]; ++i) { + for (j = 0; target.addr_list[j]; ++j) { + memcpy(&a1, self.addr_list[i], 4); + memcpy(&a2, target.addr_list[j], 4); + a1 = ntohl(a1); + a2 = ntohl(a2); + diff = a1 ^ a2; + if (diff < mindiff) { + bestaddr = j; + mindiff = diff; + } + } + } + if (bestaddr > 0) { + char * tmp; + + tmp = target.addr_list[0]; + target.addr_list[0] = target.addr_list[bestaddr]; + target.addr_list[bestaddr] = tmp; + } + } else if (af == AF_INET6) { + /* XXX To do!!! */ + } + ht.h_addr_list = target.addr_list; + return &ht; + } else { + _sethtent(0); + while (p = _gethtent()) { + if (p->h_addrtype != af) + continue; + if (strcasecmp(p->h_name, name) == 0) + break; + for (cp = p->h_aliases; *cp != 0; cp++) + if (strcasecmp(*cp, name) == 0) + goto found; + } } -found: + found: _endhtent(); return (p); } struct hostent * -_gethtbyaddr(addr, len, type) +_gethtbyaddr(addr, len, af) const char *addr; - int len, type; + int len, af; { register struct hostent *p; _sethtent(0); while (p = _gethtent()) - if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len)) + if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) break; _endhtent(); return (p); } +static void +map_v4v6_address(src, dst) + const char *src; + char *dst; +{ + u_char *p = (u_char *)dst; + char tmp[INADDRSZ]; + int i; + + /* Stash a temporary copy so our caller can update in place. */ + bcopy(src, tmp, INADDRSZ); + /* Mark this ipv6 addr as a mapped ipv4. */ + for (i = 0; i < 10; i++) + *p++ = 0x00; + *p++ = 0xff; + *p++ = 0xff; + /* Retrieve the saved copy and we're done. */ + bcopy(tmp, (void*)p, INADDRSZ); +} + +static void +map_v4v6_hostent(hp, bpp, lenp) + struct hostent *hp; + char **bpp; + int *lenp; +{ + char **ap; + + if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ) + return; + hp->h_addrtype = AF_INET6; + hp->h_length = IN6ADDRSZ; + for (ap = hp->h_addr_list; *ap; ap++) { + int i = sizeof(align) - ((u_long)*bpp % sizeof(align)); + + if (*lenp < (i + IN6ADDRSZ)) { + /* Out of memory. Truncate address list here. XXX */ + *ap = NULL; + return; + } + *bpp += i; + *lenp -= i; + map_v4v6_address(*ap, *bpp); + *ap = *bpp; + *bpp += IN6ADDRSZ; + *lenp -= IN6ADDRSZ; + } +} + #ifdef RESOLVSORT static void addrsort(ap, num) @@ -712,7 +1090,7 @@ addrsort(ap, num) p = ap; for (i = 0; i < num; i++, p++) { for (j = 0 ; (unsigned)j < _res.nsort; j++) - if (_res.sort_list[j].addr.s_addr == + if (_res.sort_list[j].addr.s_addr == (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask)) break; aval[i] = j; @@ -766,17 +1144,57 @@ ht_gethostbyname(name) } struct hostent * -ht_gethostbyaddr(addr, len, type) +ht_gethostbyaddr(addr, len, af) const char *addr; - int len, type; + int len, af; { - return (_gethtbyaddr(addr, len, type)); + return (_gethtbyaddr(addr, len, af)); } struct hostent * gethostent() { - return (_gethtent()); + struct hostent * hp; + int i; + + if ((_res.options & RES_INIT) == 0 && res_init() == -1) { + h_errno = NETDB_INTERNAL; + return (NULL); + } + + /* + * This doesn't look quite right. Shouldn't we read one + * service until it returns 0, then move on to the next + * service? If so, it requires adding some state and + * initializing that state in sethostent(). + * (davidm@azstarnet.com) + */ + for (i = 0; i < _res_hconf.num_services; ++i) { + hp = NULL; + switch (_res_hconf.service[i]) { + case SERVICE_HOSTS: + hp = _gethtent (); + break; + +#ifdef HAVE_NYS + case SERVICE_NIS: + hp = _getnishost (NULL, "hosts.byname"); + break; +#endif + + case SERVICE_BIND: + default: + break; + } + if (hp) { + if ((_res_hconf.flags & HCONF_FLAG_REORDER) + && hp->h_addr_list[0] && hp->h_addr_list[1]) + _res_hconf_reorder_addrs (hp); + return hp; + } + } + h_errno = HOST_NOT_FOUND; + return NULL; } void diff --git a/resolv/getnetnamadr.c b/resolv/getnetnamadr.c index fad2b8c0cd..9739995e36 100644 --- a/resolv/getnetnamadr.c +++ b/resolv/getnetnamadr.c @@ -139,7 +139,7 @@ static char *net_aliases[MAXALIASES], netbuf[BUFSIZ+1]; haveanswer = 0; while (--ancount >= 0 && cp < eom) { n = dn_expand(answer->buf, eom, cp, bp, buflen); - if ((n < 0) || !dn_isvalid(bp)) + if ((n < 0) || !res_dnok(bp)) break; cp += n; ans[0] = '\0'; @@ -209,7 +209,7 @@ getnetbyaddr(net, net_type) int nn, anslen; querybuf buf; char qbuf[MAXDNAME]; - u_int32_t net2; + u_int32_t net2; /* Changed from unsigned long --roland */ struct netent *net_entry; if (net_type != AF_INET) diff --git a/resolv/inet_addr.c b/resolv/inet_addr.c index bcf7f0d336..2caf747acf 100644 --- a/resolv/inet_addr.c +++ b/resolv/inet_addr.c @@ -3,7 +3,7 @@ * - * Copyright (c) 1983, 1990, 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: @@ -19,7 +19,7 @@ * 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 @@ -33,14 +33,14 @@ * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * + * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. - * + * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT @@ -70,7 +70,7 @@ static char rcsid[] = "$Id$"; * Ascii internet address interpretation routine. * The value returned is in network order. */ -u_int32_t +u_long inet_addr(cp) register const char *cp; { @@ -81,7 +81,7 @@ inet_addr(cp) return (INADDR_NONE); } -/* +/* * Check whether "cp" is a valid ascii representation * of an Internet address and convert to a binary address. * Returns 1 if the address is valid, 0 if not. @@ -93,7 +93,7 @@ inet_aton(cp, addr) register const char *cp; struct in_addr *addr; { - register u_int32_t val; + register u_int32_t val; /* changed from u_long --david */ register int base, n; register char c; u_int parts[4]; diff --git a/resolv/inet_ntop.c b/resolv/inet_ntop.c new file mode 100644 index 0000000000..71db06d845 --- /dev/null +++ b/resolv/inet_ntop.c @@ -0,0 +1,189 @@ +/* Copyright (c) 1996 by Internet Software Consortium. + * + * 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. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char rcsid[] = "$Id$"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/param.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <arpa/nameser.h> +#include <string.h> +#include <errno.h> +#include <stdio.h> +#include "../conf/portability.h" + +/* + * WARNING: Don't even consider trying to compile this on a system where + * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. + */ + +static const char *inet_ntop4 __P((const u_char *src, char *dst, size_t size)); +static const char *inet_ntop6 __P((const u_char *src, char *dst, size_t size)); + +/* char * + * inet_ntop(af, src, dst, size) + * convert a network format address to presentation format. + * return: + * pointer to presentation format address (`dst'), or NULL (see errno). + * author: + * Paul Vixie, 1996. + */ +const char * +inet_ntop(af, src, dst, size) + int af; + const void *src; + char *dst; + size_t size; +{ + switch (af) { + case AF_INET: + return (inet_ntop4(src, dst, size)); + case AF_INET6: + return (inet_ntop6(src, dst, size)); + default: + errno = EAFNOSUPPORT; + return (NULL); + } + /* NOTREACHED */ +} + +/* const char * + * inet_ntop4(src, dst, size) + * format an IPv4 address, more or less like inet_ntoa() + * return: + * `dst' (as a const) + * notes: + * (1) uses no statics + * (2) takes a u_char* not an in_addr as input + * author: + * Paul Vixie, 1996. + */ +static const char * +inet_ntop4(src, dst, size) + const u_char *src; + char *dst; + size_t size; +{ + static const char fmt[] = "%u.%u.%u.%u"; + char tmp[sizeof "255.255.255.255"]; + + if (sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) > size) { + errno = ENOSPC; + return (NULL); + } + strcpy(dst, tmp); + return (dst); +} + +/* const char * + * inet_ntop6(src, dst, size) + * convert IPv6 binary address into presentation (printable) format + * author: + * Paul Vixie, 1996. + */ +static const char * +inet_ntop6(src, dst, size) + const u_char *src; + char *dst; + size_t size; +{ + /* + * Note that int32_t and int16_t need only be "at least" large enough + * to contain a value of the specified size. On some systems, like + * Crays, there is no such thing as an integer variable with 16 bits. + * Keep this in mind if you think this function should have been coded + * to use pointer overlays. All the world's not a VAX. + */ + char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; + struct { int base, len; } best, cur; + u_int words[IN6ADDRSZ / INT16SZ]; + int i; + + /* + * Preprocess: + * Copy the input (bytewise) array into a wordwise array. + * Find the longest run of 0x00's in src[] for :: shorthanding. + */ + bzero(words, sizeof words); + for (i = 0; i < IN6ADDRSZ; i++) + words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); + best.base = -1; + cur.base = -1; + for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { + if (words[i] == 0) { + if (cur.base == -1) + cur.base = i, cur.len = 1; + else + cur.len++; + } else { + if (cur.base != -1) { + if (best.base == -1 || cur.len > best.len) + best = cur; + cur.base = -1; + } + } + } + if (cur.base != -1) { + if (best.base == -1 || cur.len > best.len) + best = cur; + } + if (best.base != -1 && best.len < 2) + best.base = -1; + + /* + * Format the result. + */ + tp = tmp; + for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { + /* Are we inside the best run of 0x00's? */ + if (best.base != -1 && i >= best.base && + i < (best.base + best.len)) { + if (i == best.base) + *tp++ = ':'; + continue; + } + /* Are we following an initial run of 0x00s or any real hex? */ + if (i != 0) + *tp++ = ':'; + /* Is this address an encapsulated IPv4? */ + if (i == 6 && best.base == 0 && + (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { + if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) + return (NULL); + tp += strlen(tp); + break; + } + tp += sprintf(tp, "%x", words[i]); + } + /* Was it a trailing run of 0x00's? */ + if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) + *tp++ = ':'; + *tp++ = '\0'; + + /* + * Check for overflow, copy, and we're done. + */ + if ((tp - tmp) > size) { + errno = ENOSPC; + return (NULL); + } + strcpy(dst, tmp); + return (dst); +} diff --git a/resolv/inet_pton.c b/resolv/inet_pton.c new file mode 100644 index 0000000000..385dc25337 --- /dev/null +++ b/resolv/inet_pton.c @@ -0,0 +1,223 @@ +/* Copyright (c) 1996 by Internet Software Consortium. + * + * 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. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char rcsid[] = "$Id$"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/param.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <arpa/nameser.h> +#include <string.h> +#include <errno.h> +#include "../conf/portability.h" + +/* + * WARNING: Don't even consider trying to compile this on a system where + * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. + */ + +static int inet_pton4 __P((const char *src, u_char *dst)); +static int inet_pton6 __P((const char *src, u_char *dst)); + +/* int + * inet_pton(af, src, dst, size) + * convert from presentation format (which usually means ASCII printable) + * to network format (which is usually some kind of binary format). + * return: + * 1 if the address was valid for the specified address family + * 0 if the address wasn't valid (`dst' is untouched in this case) + * -1 if some other error occurred (`dst' is untouched in this case, too) + * author: + * Paul Vixie, 1996. + */ +int +inet_pton(af, src, dst, size) + int af; + const char *src; + void *dst; + size_t size; +{ + switch (af) { + case AF_INET: + if (size < INADDRSZ) { + errno = ENOSPC; + return (-1); + } + return (inet_pton4(src, dst)); + case AF_INET6: + if (size < IN6ADDRSZ) { + errno = ENOSPC; + return (-1); + } + return (inet_pton6(src, dst)); + default: + errno = EINVAL; + return (-1); + } + /* NOTREACHED */ +} + +/* int + * inet_pton4(src, dst) + * like inet_pton() but without all the hexadecimal and shorthand. + * return: + * 1 if `src' is a valid dotted quad, else 0. + * notice: + * does not touch `dst' unless it's returning 1. + * author: + * Paul Vixie, 1996. + */ +static int +inet_pton4(src, dst) + const char *src; + u_char *dst; +{ + static const char digits[] = "0123456789"; + int saw_digit, octets, ch; + u_char tmp[INADDRSZ], *tp; + + saw_digit = 0; + octets = 0; + *(tp = tmp) = 0; + while ((ch = *src++) != '\0') { + const char *pch; + + if ((pch = strchr(digits, ch)) != NULL) { + u_int new = *tp * 10 + (pch - digits); + + if (new > 255) + return (0); + *tp = new; + if (! saw_digit) { + if (++octets > 4) + return (0); + saw_digit = 1; + } + } else if (ch == '.' && saw_digit) { + if (octets == 4) + return (0); + *++tp = 0; + saw_digit = 0; + } else + return (0); + } + if (octets < 4) + return (0); + bcopy(tmp, dst, INADDRSZ); + return (1); +} + +/* int + * inet_pton6(src, dst) + * convert presentation level address to network order binary form. + * return: + * 1 if `src' is a valid [RFC1884 2.2] address, else 0. + * notice: + * (1) does not touch `dst' unless it's returning 1. + * (2) :: in a full address is silently ignored. + * credit: + * inspired by Mark Andrews. + * author: + * Paul Vixie, 1996. + */ +static int +inet_pton6(src, dst) + const char *src; + u_char *dst; +{ + static const char xdigits_l[] = "0123456789abcdef", + xdigits_u[] = "0123456789ABCDEF"; + u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp; + const char *xdigits, *curtok; + int ch, saw_xdigit; + u_int val; + + bzero((tp = tmp), IN6ADDRSZ); + endp = tp + IN6ADDRSZ; + colonp = NULL; + /* Leading :: requires some special handling. */ + if (*src == ':') + if (*++src != ':') + return (0); + curtok = src; + saw_xdigit = 0; + val = 0; + while ((ch = *src++) != '\0') { + const char *pch; + + if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) + pch = strchr((xdigits = xdigits_u), ch); + if (pch != NULL) { + val <<= 4; + val |= (pch - xdigits); + if (val > 0xffff) + return (0); + saw_xdigit = 1; + continue; + } + if (ch == ':') { + curtok = src; + if (!saw_xdigit) { + if (colonp) + return (0); + colonp = tp; + continue; + } + if (tp + INT16SZ > endp) + return (0); + *tp++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_char) val & 0xff; + saw_xdigit = 0; + val = 0; + continue; + } + if (ch == '.' && ((tp + INADDRSZ) <= endp) && + inet_pton4(curtok, tp) > 0) { + tp += INADDRSZ; + saw_xdigit = 0; + break; /* '\0' was seen by inet_pton4(). */ + } + return (0); + } + if (saw_xdigit) { + if (tp + INT16SZ > endp) + return (0); + *tp++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_char) val & 0xff; + } + if (colonp != NULL) { + /* + * Since some memmove()'s erroneously fail to handle + * overlapping regions, we'll do the shift by hand. + */ + const howmany = tp - colonp; + int i; + + for (i = 1; i <= howmany; i++) { + endp[- i] = colonp[howmany - i]; + colonp[howmany - i] = 0; + } + tp = endp; + } + if (tp != endp) + return (0); + bcopy(tmp, dst, IN6ADDRSZ); + return (1); +} diff --git a/resolv/res_comp.c b/resolv/res_comp.c index f234772e41..e105dbb0b6 100644 --- a/resolv/res_comp.c +++ b/resolv/res_comp.c @@ -3,7 +3,7 @@ * - * Copyright (c) 1985, 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: @@ -19,7 +19,7 @@ * 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 @@ -33,14 +33,14 @@ * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * + * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. - * + * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT @@ -343,7 +343,7 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr) /**** To: "Lawrence R. Rogers" <lrr@cert.org> cc: cert@cert.org, pvm@home.net -Subject: Re: VU#14542 +Subject: Re: VU#14542 In-reply-to: Your message of "Mon, 19 Feb 1996 17:16:27 PST." Date: Tue, 20 Feb 1996 22:37:21 -0800 From: Paul A Vixie <vixie@wisdom.home.vix.com> @@ -359,7 +359,7 @@ in retrospect, should have been hostname = label ( "." label )+ - firstchar = [a-zA-Z0-9_] + firstchar = [a-zA-Z0-9] otherchar = [a-zA-Z0-9_-] label = firstchar otherchar* @@ -368,53 +368,98 @@ earlier. since i'm only trying to bend the spec to fit actual known uses, i should not have widened the rules as far as i did earlier. ****/ -#define firstchar(c) ((isascii(c) && isalnum(c)) || (c) == '_') -#define otherchar(c) (firstchar(c) || (c) == '-') -#define wildlabel(firstlabel, ch, nch) \ - ((firstlabel) && (ch) == '*' && ((nch) == '.' || (nch) == '\0')) +/* + * Note the conspicuous absence of ctype macros in these definitions. On + * non-ASCII hosts, we can't depend on string literals or ctype macros to + * tell us anything about network-format data. The rest of the BIND system + * is not careful about this, but for some reason, we're doing it right here. + */ +#define PERIOD 0x2e +#define hyphenchar(c) ((c) == 0x2d) +#define bslashchar(c) ((c) == 0x5c) +#define periodchar(c) ((c) == PERIOD) +#define asterchar(c) ((c) == 0x2a) +#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ + || ((c) >= 0x61 && (c) <= 0x7a)) +#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) + +#define borderchar(c) (alphachar(c) || digitchar(c)) +#define middlechar(c) (borderchar(c) || hyphenchar(c)) +#define domainchar(c) ((c) > 0x20 && (c) < 0x7f) int res_hnok(dn) const char *dn; { - int ppch = '\0', pch = '.', ch = *dn++, firstlabel = 1; + int ppch = '\0', pch = PERIOD, ch = *dn++; while (ch != '\0') { int nch = *dn++; - if (ch == '.' || (ch == '\\' && nch == '.')) { + if (periodchar(ch)) { NULL; - } else if (pch == '.' && ppch != '\\') { - if (!firstchar(ch) && !wildlabel(firstlabel, ch, nch)) + } else if (periodchar(pch)) { + if (!borderchar(ch)) + return (0); + } else if (periodchar(nch) || nch == '\0') { + if (!borderchar(ch)) return (0); } else { - if (!otherchar(ch)) + if (!middlechar(ch)) return (0); } ppch = pch, pch = ch, ch = nch; - firstlabel = 0; } return (1); } /* + * hostname-like (A, MX, WKS) owners can have "*" as their first label + * but must otherwise be as a host name. + */ +int +res_ownok(dn) + const char *dn; +{ + if (asterchar(dn[0]) && periodchar(dn[1])) + dn += 2; + return (res_hnok(dn)); +} + +/* + * SOA RNAMEs and RP RNAMEs can have any printable character in their first + * label, but the rest of the name has to look like a host name. + */ +int +res_mailok(dn) + const char *dn; +{ + int ch, pch; + + pch = '\0'; + while ((ch = *dn++) != '\0') { + if (!domainchar(ch)) + return (0); + if (periodchar(ch) && !bslashchar(pch)) + break; + pch = ch; + } + return (res_hnok(dn)); +} + +/* * This function is quite liberal, since RFC 1034's character sets are only * recommendations. - * - * Note that some char's are signed, so we have to cast to unsigned. */ int -dn_isvalid(dn) +res_dnok(dn) const char *dn; { - unsigned char *t = (unsigned char *)dn; int ch; - while ((ch = *t++) != '\0') - if (ch <= 0x1f || ch >= 0x7f) { - /* Unprintable in ASCII. */ + while ((ch = *dn++) != '\0') + if (!domainchar(ch)) return (0); - } return (1); } @@ -498,7 +543,7 @@ putlong(l, msgp) { __putlong(l, msgp); } - + #undef dn_skipname dn_skipname(comp_dn, eom) const u_char *comp_dn, *eom; diff --git a/resolv/res_debug.c b/resolv/res_debug.c index 85ec628b89..4f55804497 100644 --- a/resolv/res_debug.c +++ b/resolv/res_debug.c @@ -3,7 +3,7 @@ * - * Copyright (c) 1985, 1990, 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: @@ -19,7 +19,7 @@ * 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 @@ -33,14 +33,14 @@ * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * + * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. - * + * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT @@ -59,6 +59,8 @@ static char rcsid[] = "$Id$"; #endif /* LIBC_SCCS and not lint */ #include <sys/param.h> +#include <sys/types.h> +#include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <arpa/nameser.h> @@ -66,7 +68,7 @@ static char rcsid[] = "$Id$"; #include <stdio.h> #include <netdb.h> #include <resolv.h> -#if defined(BSD) && (BSD >= 199103) +#if defined(BSD) && (BSD >= 199103) && defined(AF_INET6) # include <string.h> #else # include "../conf/portability.h" @@ -295,7 +297,7 @@ __fp_nquery(msg, len, file) fprintf(file, ", Auth: %d", ntohs(hp->nscount)); fprintf(file, ", Addit: %d", ntohs(hp->arcount)); } - if ((!_res.pfcode) || (_res.pfcode & + if ((!_res.pfcode) || (_res.pfcode & (RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) { putc('\n',file); } @@ -590,6 +592,13 @@ __p_rr(cp, msg, file) cp += dlen; break; + case T_AAAA: { + char t[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"]; + + fprintf(file, "\t%s\n", inet_ntop(AF_INET6, cp, t, sizeof t)); + break; + } + case T_MINFO: case T_RP: putc('\t', file); diff --git a/resolv/res_hconf.c b/resolv/res_hconf.c new file mode 100644 index 0000000000..b08dd3ced7 --- /dev/null +++ b/resolv/res_hconf.c @@ -0,0 +1,566 @@ +/* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc. + Contributed by David Mosberger (davidm@azstarnet.com). + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* This file provides a Linux /etc/host.conf compatible front end to +the various name resolvers (/etc/hosts, named, NIS server, etc.). +Though mostly compatibly, the following differences exist compared +to the original implementation: + + - new command "spoof" takes an arguments like RESOLV_SPOOF_CHECK + environment variable (i.e., `off', `nowarn', or `warn'). + + - line comments can appear anywhere (not just at the beginning of + a line) +*/ +#include <ctype.h> +#include <memory.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "res_hconf.h" + +#define _PATH_HOSTCONF "/etc/host.conf" + +/* Environment vars that all user to override default behavior: */ +#define ENV_HOSTCONF "RESOLV_HOST_CONF" +#define ENV_SERVORDER "RESOLV_SERV_ORDER" +#define ENV_SPOOF "RESOLV_SPOOF_CHECK" +#define ENV_TRIM_OVERR "RESOLV_OVERRIDE_TRIM_DOMAINS" +#define ENV_TRIM_ADD "RESOLV_ADD_TRIM_DOMAINS" +#define ENV_MULTI "RESOLV_MULTI" +#define ENV_REORDER "RESOLV_REORDER" + +static const char * arg_service_list (const char *, int, const char *, + unsigned); +static const char * arg_trimdomain_list (const char *, int, const char *, + unsigned); +static const char * arg_spoof (const char *, int, const char *, unsigned); +static const char * arg_bool (const char *, int, const char *, unsigned); + +static struct cmd { + const char * name; + const char * (*parse_args)(const char * filename, int line_num, + const char * args, unsigned arg); + unsigned arg;; +} cmd[] = { + {"order", arg_service_list, 0}, + {"trim", arg_trimdomain_list, 0}, + {"spoof", arg_spoof, 0}, + {"multi", arg_bool, HCONF_FLAG_MULTI}, + {"nospoof", arg_bool, HCONF_FLAG_SPOOF}, + {"spoofalert", arg_bool, HCONF_FLAG_SPOOFALERT}, + {"reorder", arg_bool, HCONF_FLAG_REORDER} +}; + + +/* + * Why isn't this in stdlib? + */ +char * +strndup (const char * s, size_t n) +{ + char * retval; + + retval = malloc (n + 1); + if (!retval) + return retval; + + memcpy (retval, s, n); + retval[n] = '\0'; /* ensure return value is terminated */ + return retval; +} + + +/* Skip white space. */ +static const char * +skip_ws (const char * str) +{ + while (isspace (*str)) ++str; + return str; +} + + +/* Skip until whitespace, comma, end of line, or comment character. */ +static const char * +skip_string (const char * str) +{ + while (*str && !isspace (*str) && *str != '#' && *str != ',') ++str; + return str; +} + + +static const char * +arg_service_list (const char * fname, int line_num, const char * args, + unsigned arg) +{ + enum Name_Service service; + const char * start; + size_t len; + int i; + static struct { + const char * name; + enum Name_Service service; + } svcs[] = { + {"bind", SERVICE_BIND}, + {"hosts", SERVICE_HOSTS}, + {"nis", SERVICE_NIS}, + }; + + do + { + start = args; + args = skip_string (args); + len = args - start; + + service = SERVICE_NONE; + for (i = 0; i < sizeof (svcs) / sizeof (svcs[0]); ++i) + { + if (strncasecmp (start, svcs[i].name, len) == 0 + && len == strlen (svcs[i].name)) + { + service = svcs[i].service; + break; + } + } + if (service == SERVICE_NONE) + { + fprintf (stderr, "%s: line %d: expected service, found `%s'\n", + fname, line_num, start); + return 0; + } + if (_res_hconf.num_services >= SERVICE_MAX) + { + fprintf (stderr, "%s: line %d: cannot specify more than %d services", + fname, line_num, SERVICE_MAX); + return 0; + } + _res_hconf.service[_res_hconf.num_services++] = service; + + args = skip_ws (args); + switch (*args) + { + case ',': case ';': case ':': + args = skip_ws (++args); + if (!*args || *args == '#') + { + fprintf (stderr, + "%s: line %d: list delimiter not followed by keyword", + fname, line_num); + return 0; + } + default: + break; + } + } + while (*args && *args != '#'); + return args; +} + + +static const char * +arg_trimdomain_list (const char * fname, int line_num, const char * args, + unsigned flag) +{ + const char * start; + size_t len; + + do + { + start = args; + args = skip_string (args); + len = args - start; + + if (_res_hconf.num_trimdomains >= TRIMDOMAINS_MAX) + { + fprintf (stderr, + "%s: line %d: cannot specify more than %d trim domains", + fname, line_num, TRIMDOMAINS_MAX); + return 0; + } + _res_hconf.trimdomain[_res_hconf.num_trimdomains++] = + strndup (start, len); + args = skip_ws (args); + switch (*args) + { + case ',': case ';': case ':': + args = skip_ws (++args); + if (!*args || *args == '#') + { + fprintf (stderr, + "%s: line %d: list delimiter not followed by domain", + fname, line_num); + return 0; + } + default: + break; + } + } + while (*args && *args != '#'); + return args; +} + + +static const char * +arg_spoof (const char * fname, int line_num, const char * args, unsigned flag) +{ + const char * start = args; + size_t len; + + args = skip_string (args); + len = args - start; + + if (len == 3 && strncasecmp (start, "off", len) == 0) + _res_hconf.flags &= ~(HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT); + else + { + _res_hconf.flags |= (HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT); + if ((len == 6 && strncasecmp (start, "nowarn", len) == 0) + || !(len == 4 && strncasecmp (start, "warn", len) == 0)) + _res_hconf.flags &= ~HCONF_FLAG_SPOOFALERT; + } + return args; +} + + +static const char * +arg_bool (const char * fname, int line_num, const char * args, unsigned flag) +{ + if (strncasecmp (args, "on", 2) == 0) + { + args += 2; + _res_hconf.flags |= flag; + } + else if (strncasecmp (args, "off", 3) == 0) + { + args += 3; + _res_hconf.flags &= ~flag; + } + else + { + fprintf (stderr, "%s: line %d: expected `on' or `off', found `%s'\n", + fname, line_num, args); + return 0; + } + return args; +} + + +static void +parse_line (const char * fname, int line_num, const char * str) +{ + const char * start; + struct cmd * c = 0; + size_t len; + int i; + + str = skip_ws (str); + + if (*str == '#') return; /* skip line comment */ + + start = str; + str = skip_string (str); + len = str - start; + + for (i = 0; i < sizeof (cmd) / sizeof (cmd[0]); ++i) + { + if (strncasecmp (start, cmd[i].name, len) == 0 + && strlen (cmd[i].name) == len) + { + c = &cmd[i]; + break; + } + } + if (!c) + { + fprintf (stderr, "%s: line %d: bad command `%s'\n", + fname, line_num, start); + return; + } + + /* process args: */ + str = skip_ws (str); + str = (*c->parse_args) (fname, line_num, str, c->arg); + if (!str) + return; + + /* rest of line must contain white space or comment only: */ + while (*str) + { + if (!isspace (*str)) { + if (*str != '#') + fprintf (stderr, "%s: line %d: ignoring trailing garbage `%s'\n", + fname, line_num, str); + break; + } + ++str; + } +} + + +/* Initialize hconf datastructure by reading host.conf file and + environment variables. */ +void +_res_hconf_init (void) +{ + const char * hconf_name; + int line_num = 0; + char buf[256], * end, * envval; + FILE * fp; + + memset (&_res_hconf, 0, sizeof (_res_hconf)); + + hconf_name = getenv (ENV_HOSTCONF); + if (!hconf_name) + hconf_name = _PATH_HOSTCONF; + + fp = fopen (hconf_name, "r"); + if (!fp) + /* make up something reasonable: */ + _res_hconf.service[_res_hconf.num_services++] = SERVICE_BIND; + else + { + while (fgets (buf, sizeof (buf), fp)) + { + ++line_num; + end = strchr (buf, '\n'); + if (end) + *end = '\0'; + parse_line (hconf_name, line_num, buf); + } + fclose (fp); + } + + envval = getenv (ENV_SERVORDER); + if (envval) + { + _res_hconf.num_services = 0; + arg_service_list (ENV_SERVORDER, 1, envval, 0); + } + + envval = getenv (ENV_SPOOF); + if (envval) + arg_spoof (ENV_SPOOF, 1, envval, 0); + + envval = getenv (ENV_MULTI); + if (envval) + arg_bool (ENV_MULTI, 1, envval, HCONF_FLAG_MULTI); + + envval = getenv (ENV_REORDER); + if (envval) + arg_bool (ENV_REORDER, 1, envval, HCONF_FLAG_REORDER); + + envval = getenv (ENV_TRIM_ADD); + if (envval) + arg_trimdomain_list (ENV_TRIM_ADD, 1, envval, 0); + + envval = getenv (ENV_TRIM_OVERR); + if (envval) + { + _res_hconf.num_trimdomains = 0; + arg_trimdomain_list (ENV_TRIM_OVERR, 1, envval, 0); + } +} + + +/* Reorder addresses returned in a hostent such that the first address + is an address on the local subnet, if there is such an address. + Otherwise, nothing is changed. */ + +void +_res_hconf_reorder_addrs (struct hostent * hp) +{ +#if defined (SIOCGIFCONF) && defined (SIOCGIFNETMASK) + static int num_ifs = -1; /* number of interfaces */ + static struct netaddr { + int addrtype; + union { + struct { + u_int32_t addr; + u_int32_t mask; + } ipv4 + } u; + } * ifaddrs; + + if (hp->h_addrtype != AF_INET) + return; /* can't deal with anything but IPv4 for now... */ + + if (num_ifs <= 0) + { + struct ifconf ifs; + struct ifreq * ifr; + size_t size, num; + int sd; + + /* initialize interface table: */ + + num_ifs = 0; + + sd = socket (AF_INET, SOCK_DGRAM, 0); + if (sd < 0) + return; + + /* Now get list of interfaces. Since we don't know how many + interfaces there are, we keep increasing the buffer size + until we have at least sizeof(struct ifreq) too many bytes. + That implies that the ioctl() return because it ran out of + interfaces, not memory */ + size = 0; + ifs.ifc_buf = 0; + do { + size += 4 * sizeof (struct ifreq); + ifs.ifc_buf = realloc (ifs.ifs_buf, size); + if (!ifs.ifc_buf) + { + close (sd); + return; + } + ifs.ifc_len = size; + if (ioctl (sd, SIOCGIFCONF, &ifs) < 0) + goto cleanup; + } while (size - ifs.ifc_len < sizeof (struct ifreq)); + + num = ifs.ifc_len / sizeof (struct ifreq); + + ifaddrs = malloc (num * sizeof (ifaddrs[0])); + if (!ifaddrs) + goto cleanup; + + ifr = ifs.ifc_req; + for (i = 0; i < num; ++i) { + if (ifr->ifr_addr.sa_family != AF_INET) + continue; + ifaddrs[num_ifs].addrtype = AF_INET; + + memcpy (&ifaddrs[num_ifs].u.ipv4.addr, + &((struct sockaddr_in *)ifr->ifr_addr)->sin_addr, 4); + + if (ioctl (sd, SIOCGIFNETMASK, if) < 0) + continue; + memcpy (&ifaddrs[num_ifs].u.ipv4.mask, + ((struct sockaddr_in *)ifr->ifr_mask)->sin_addr, 4); + + ++num_ifs; /* now we're committed to this entry */ + } + /* just keep enough memory to hold all the interfaces we want: */ + ifaddrs = realloc (ifaddrs, num_ifs * sizeof (ifaddrs[0])); + + cleanup: + close (sd); + free (ifs.ifc_buf); + } + + if (num_ifs == 0) + return; + + /* find an address for which we have a direct connection: */ + for (i = 0; hp->h_addr_list[i]; ++i) + { + h_addr = (struct in_addr *) hp->h_addr_list[i]; + + for (j = 0; j < num_ifs; ++j) + { + if_addr = ifaddrs[j].u.ipv4.addr; + if_netmask = ifaddrs[j].u.ipv4.mask; + + if (((h_addr->s_addr ^ if_addr) & if_netmask) == 0) + { + void * tmp; + + tmp = hp->h_addr_list[i]; + hp->h_addr_list[i] = hp->h_addr_list[0]; + hp->h_addr_list[0] = tmp; + return; + } + } + } +#endif /* defined(SIOCGIFCONF) && ... */ +} + + +/* If HOSTNAME has a postfix matching any of the trimdomains, trim away + that postfix. Notice that HOSTNAME is modified inplace. Also, the + original code applied all trimdomains in order, meaning that the + same domainname could be trimmed multiple times. I believe this + was unintentional. */ +void +_res_hconf_trim_domain (char * hostname) +{ + size_t hostname_len, trim_len; + int i; + + hostname_len = strlen(hostname); + + for (i = 0; i < _res_hconf.num_trimdomains; ++i) + { + const char * trim = _res_hconf.trimdomain[i]; + + trim_len = strlen(trim); + if (hostname_len > trim_len + && strcasecmp(&hostname[hostname_len - trim_len], trim) == 0) + { + hostname[hostname_len - trim_len] = '\0'; + break; + } + } +} + + +/* Trim all hostnames/aliases in HP according to the trimdomain list. + Notice that HP is modified inplace! */ +void +_res_hconf_trim_domains (struct hostent * hp) +{ + int i; + + if (_res_hconf.num_trimdomains == 0) + return; + + _res_hconf_trim_domain (hp->h_name); + for (i = 0; hp->h_aliases[i]; ++i) + _res_hconf_trim_domain (hp->h_aliases[i]); +} + + +#if 0 + +struct hostent * +_hconf_gethostent (void) +{ +} + + +struct hostent * +_hconf_gethostbyname (const char * name) +{ + +} + + +struct hostent * +_hconf_gethostbyaddr (const char * addr, int len, int type) +{ +} + + +struct hostent * +_hconf_gethtbyname (const char * name) +{ +} + +#endif diff --git a/resolv/res_hconf.h b/resolv/res_hconf.h new file mode 100644 index 0000000000..2165e40711 --- /dev/null +++ b/resolv/res_hconf.h @@ -0,0 +1,50 @@ +/* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc. + Contributed by David Mosberger (davidm@azstarnet.com). + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#ifndef _RES_HCONF_H_ +#define _RES_HCONF_H_ + +#include <netdb.h> + +#define TRIMDOMAINS_MAX 4 + +enum Name_Service { + SERVICE_NONE = 0, + SERVICE_BIND, SERVICE_HOSTS, SERVICE_NIS, + SERVICE_MAX +}; + +struct hconf { + int num_services; + enum Name_Service service[SERVICE_MAX]; + int num_trimdomains; + const char * trimdomain[TRIMDOMAINS_MAX]; + unsigned flags; +# define HCONF_FLAG_INITED (1 << 0) /* initialized? */ +# define HCONF_FLAG_SPOOF (1 << 1) /* refuse spoofed addresses */ +# define HCONF_FLAG_SPOOFALERT (1 << 2) /* syslog warning of spoofed */ +# define HCONF_FLAG_REORDER (1 << 3) /* list best address first */ +# define HCONF_FLAG_MULTI (1 << 4) /* see comments for gethtbyname() */ +} _res_hconf; + +extern void _res_hconf_init (void); +extern void _res_hconf_trim_domain (char * domain); +extern void _res_hconf_trim_domains (struct hostent * hp); +extern void _res_hconf_reorder_addrs (struct hostent * hp); + +#endif /* _RES_HCONF_H_ */ diff --git a/resolv/res_init.c b/resolv/res_init.c index 42c7c2ef8c..4e8af680c1 100644 --- a/resolv/res_init.c +++ b/resolv/res_init.c @@ -3,7 +3,7 @@ * - * Copyright (c) 1985, 1989, 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: @@ -19,7 +19,7 @@ * 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 @@ -33,14 +33,14 @@ * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * + * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. - * + * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT @@ -76,6 +76,8 @@ static char rcsid[] = "$Id$"; # include "../conf/portability.h" #endif +#include "res_hconf.h" + /*-------------------------------------- info about "sortlist" -------------- * Marc Majka 1994/04/16 * Allan Nathanson 1994/10/29 (BIND 4.9.3.x) @@ -137,7 +139,7 @@ struct __res_state _res; * since it was noted that INADDR_ANY actually meant ``the first interface * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, * it had to be "up" in order for you to reach your own name server. It - * was later decided that since the recommended practice is to always + * was later decided that since the recommended practice is to always * install local static routes through 127.0.0.1 for all your network * interfaces, that we could solve this problem without a code change. * @@ -354,11 +356,11 @@ res_init() if (inet_aton(net, &a)) { _res.sort_list[nsort].mask = a.s_addr; } else { - _res.sort_list[nsort].mask = + _res.sort_list[nsort].mask = net_mask(_res.sort_list[nsort].addr); } } else { - _res.sort_list[nsort].mask = + _res.sort_list[nsort].mask = net_mask(_res.sort_list[nsort].addr); } nsort++; @@ -373,7 +375,7 @@ res_init() continue; } } - if (nserv > 1) + if (nserv > 1) _res.nscount = nserv; #ifdef RESOLVSORT _res.nsort = nsort; @@ -419,6 +421,8 @@ res_init() if ((cp = getenv("RES_OPTIONS")) != NULL) res_setoptions(cp, "env"); _res.options |= RES_INIT; + + _res_hconf_init (); return (0); } @@ -458,6 +462,8 @@ res_setoptions(options, source) } printf(";;\tdebug\n"); #endif + } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { + _res.options |= RES_USE_INET6; } else { /* XXX - print a warning here? */ } @@ -562,7 +568,7 @@ netinfo_res_init(haveenv, havesearch) } ni_namelist_free(&nl); } - + if (nserv > 1) _res.nscount = nserv; diff --git a/resolv/resolv.h b/resolv/resolv.h index 1a4a0dec89..0f5d5b855b 100644 --- a/resolv/resolv.h +++ b/resolv/resolv.h @@ -3,7 +3,7 @@ * - * Copyright (c) 1983, 1987, 1989, 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: @@ -19,7 +19,7 @@ * 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 @@ -33,14 +33,14 @@ * SUCH DAMAGE. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. - * + * * 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, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. - * + * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT @@ -140,6 +140,7 @@ struct __res_state { #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ +#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) @@ -185,7 +186,9 @@ extern struct __res_state _res; /* Private routines shared between libc/net, named, nslookup and others. */ #define res_hnok __res_hnok -#define dn_isvalid __dn_isvalid +#define res_ownok __res_ownok +#define res_mailok __res_mailok +#define res_dnok __res_dnok #define dn_skipname __dn_skipname #define fp_query __fp_query #define fp_nquery __fp_nquery @@ -206,7 +209,9 @@ extern struct __res_state _res; #define res_queriesmatch __res_queriesmatch __BEGIN_DECLS int __res_hnok __P((const char *)); -int __dn_isvalid __P((const char *)); +int __res_ownok __P((const char *)); +int __res_mailok __P((const char *)); +int __res_dnok __P((const char *)); int __dn_skipname __P((const u_char *, const u_char *)); void __fp_resstat __P((struct __res_state *, FILE *)); void __fp_query __P((const u_char *, FILE *)); |