diff options
Diffstat (limited to 'newlib/libc/sys/linux/net/name6.c')
| -rw-r--r-- | newlib/libc/sys/linux/net/name6.c | 1812 |
1 files changed, 0 insertions, 1812 deletions
diff --git a/newlib/libc/sys/linux/net/name6.c b/newlib/libc/sys/linux/net/name6.c deleted file mode 100644 index f220e213c..000000000 --- a/newlib/libc/sys/linux/net/name6.c +++ /dev/null @@ -1,1812 +0,0 @@ -/* $KAME: name6.c,v 1.25 2000/06/26 16:44:40 itojun Exp $ */ - -/* - * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project. - * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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. - */ -/* - * ++Copyright++ 1985, 1988, 1993 - * - - * 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: - * 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. - * - - * 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 - * CORPORATION 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. - * - - * --Copyright-- - */ - -/* - * Atsushi Onoe <onoe@sm.sony.co.jp> - */ - -/* - * TODO for thread safe - * use mutex for _hostconf, _hostconf_init. - * rewrite resolvers to be thread safe - */ - -#include <sys/cdefs.h> -#include <sys/types.h> -#include <machine/endian.h> -#include <sys/types.h> -#include <unistd.h> - -#include "namespace.h" -#include <sys/param.h> -#include <sys/socket.h> -#include <sys/time.h> -#include <sys/queue.h> -#include <netinet/in.h> - -#include <arpa/inet.h> -#include <arpa/nameser.h> - -#include <errno.h> -#include <netdb.h> -#include <resolv.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <stdarg.h> -#include <nsswitch.h> -#include <unistd.h> -#include "un-namespace.h" - -#ifndef _PATH_HOSTS -#define _PATH_HOSTS "/etc/hosts" -#endif - -#ifndef MAXALIASES -#define MAXALIASES 35 -#endif -#ifndef MAXADDRS -#define MAXADDRS 2 -#endif -#ifndef MAXDNAME -#define MAXDNAME 1025 -#endif - -#ifdef INET6 -#define ADDRLEN(af) ((af) == AF_INET6 ? sizeof(struct in6_addr) : \ - sizeof(struct in_addr)) -#else -#define ADDRLEN(af) sizeof(struct in_addr) -#endif - -#define MAPADDR(ab, ina) \ -do { \ - memcpy(&(ab)->map_inaddr, ina, sizeof(struct in_addr)); \ - memset((ab)->map_zero, 0, sizeof((ab)->map_zero)); \ - memset((ab)->map_one, 0xff, sizeof((ab)->map_one)); \ -} while (0) -#define MAPADDRENABLED(flags) \ - (((flags) & AI_V4MAPPED) || \ - (((flags) & AI_V4MAPPED_CFG) && _mapped_addr_enabled())) - -union inx_addr { - struct in_addr in_addr; -#ifdef INET6 - struct in6_addr in6_addr; -#endif - struct { - u_char mau_zero[10]; - u_char mau_one[2]; - struct in_addr mau_inaddr; - } map_addr_un; -#define map_zero map_addr_un.mau_zero -#define map_one map_addr_un.mau_one -#define map_inaddr map_addr_un.mau_inaddr -}; - -u_int16_t _getshort(const u_char *src); - -static struct hostent *_hpcopy(struct hostent *hp, int *errp); -static struct hostent *_hpaddr(int af, const char *name, void *addr, int *errp); -static struct hostent *_hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp); -#ifdef INET6 -static struct hostent *_hpmapv6(struct hostent *hp, int *errp); -#endif -static struct hostent *_hpsort(struct hostent *hp); -static struct hostent *_ghbyname(const char *name, int af, int flags, int *errp); -static char *_hgetword(char **pp); -static int _mapped_addr_enabled(void); - -static FILE *_files_open(int *errp); -static int _files_ghbyname(void *, void *, va_list); -static int _files_ghbyaddr(void *, void *, va_list); -#if 0 // keep gcc happy -static void _files_shent(int stayopen); -static void _files_ehent(void); -#endif -#ifdef YP -static int _nis_ghbyname(void *, void *, va_list); -static int _nis_ghbyaddr(void *, void *, va_list); -#endif -static int _dns_ghbyname(void *, void *, va_list); -static int _dns_ghbyaddr(void *, void *, va_list); -#if 0 // keep gcc happy -static void _dns_shent(int stayopen); -static void _dns_ehent(void); -#endif - -#ifdef ICMPNL -static int _icmp_ghbyaddr(void *, void *, va_list); -#endif /* ICMPNL */ - -/* Host lookup order if nsswitch.conf is broken or nonexistant */ -static const ns_src default_src[] = { - { NSSRC_FILES, NS_SUCCESS }, - { NSSRC_DNS, NS_SUCCESS }, -#ifdef ICMPNL -#define NSSRC_ICMP "icmp" - { NSSRC_ICMP, NS_SUCCESS }, -#endif - { 0 } -}; - -/* - * Check if kernel supports mapped address. - * implementation dependent - */ -#ifdef __KAME__ -#include <sys/sysctl.h> -#endif /* __KAME__ */ - -static int -_mapped_addr_enabled(void) -{ - /* implementation dependent check */ -#if defined(__KAME__) && defined(IPV6CTL_MAPPED_ADDR) - int mib[4]; - size_t len; - int val; - - mib[0] = CTL_NET; - mib[1] = PF_INET6; - mib[2] = IPPROTO_IPV6; - mib[3] = IPV6CTL_MAPPED_ADDR; - len = sizeof(val); - if (__sysctl(mib, 4, &val, &len, 0, 0) == 0 && val != 0) - return 1; -#endif /* __KAME__ && IPV6CTL_MAPPED_ADDR */ - return 0; -} - -/* - * Functions defined in RFC2553 - * getipnodebyname, getipnodebyaddr, freehostent - */ - -static struct hostent * -_ghbyname(const char *name, int af, int flags, int *errp) -{ - struct hostent *hp; - int rval; - - static const ns_dtab dtab[] = { - NS_FILES_CB(_files_ghbyname, NULL) - { NSSRC_DNS, _dns_ghbyname, NULL }, - NS_NIS_CB(_nis_ghbyname, NULL) - { 0 } - }; - - if (flags & AI_ADDRCONFIG) { - int s; - - /* - * TODO: - * Note that implementation dependent test for address - * configuration should be done everytime called - * (or apropriate interval), - * because addresses will be dynamically assigned or deleted. - */ - if (af == AF_UNSPEC) { - if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) - af = AF_INET; - else { - close(s); - if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) - af = AF_INET6; - else - close(s); - } - - } - if (af != AF_UNSPEC) { - if ((s = socket(af, SOCK_DGRAM, 0)) < 0) - return NULL; - close(s); - } - } - - rval = nsdispatch(&hp, dtab, NSDB_HOSTS, "ghbyname", default_src, - name, af, errp); - return (rval == NS_SUCCESS) ? hp : NULL; -} - -/* getipnodebyname() internal routine for multiple query(PF_UNSPEC) support. */ -struct hostent * -_getipnodebyname_multi(const char *name, int af, int flags, int *errp) -{ - struct hostent *hp; - union inx_addr addrbuf; - - /* XXX: PF_UNSPEC is only supposed to be passed from getaddrinfo() */ - if (af != AF_INET -#ifdef INET6 - && af != AF_INET6 -#endif - && af != PF_UNSPEC - ) - { - *errp = NO_RECOVERY; - return NULL; - } - -#ifdef INET6 - /* special case for literal address */ - if (inet_pton(AF_INET6, name, &addrbuf) == 1) { - if (af != AF_INET6) { - *errp = HOST_NOT_FOUND; - return NULL; - } - return _hpaddr(af, name, &addrbuf, errp); - } -#endif - if (inet_aton(name, (struct in_addr *)&addrbuf) == 1) { - if (af != AF_INET) { - if (MAPADDRENABLED(flags)) { - MAPADDR(&addrbuf, &addrbuf.in_addr); - } else { - *errp = HOST_NOT_FOUND; - return NULL; - } - } - return _hpaddr(af, name, &addrbuf, errp); - } - - *errp = HOST_NOT_FOUND; - hp = _ghbyname(name, af, flags, errp); - -#ifdef INET6 - if (af == AF_INET6 - && ((flags & AI_ALL) || hp == NULL) - && (MAPADDRENABLED(flags))) { - struct hostent *hp2 = _ghbyname(name, AF_INET, flags, errp); - if (hp == NULL) - hp = _hpmapv6(hp2, errp); - else { - if (hp2 && strcmp(hp->h_name, hp2->h_name) != 0) { - freehostent(hp2); - hp2 = NULL; - } - hp = _hpmerge(hp, hp2, errp); - } - } -#endif - return _hpsort(hp); -} - -struct hostent * -getipnodebyname(const char *name, int af, int flags, int *errp) -{ - if (af != AF_INET -#ifdef INET6 - && af != AF_INET6 -#endif - ) - { - *errp = NO_RECOVERY; - return NULL; - } - return(_getipnodebyname_multi(name, af ,flags, errp)); -} - -struct hostent * -getipnodebyaddr(const void *src, size_t len, int af, int *errp) -{ - struct hostent *hp; - int rval; -#ifdef INET6 - struct in6_addr addrbuf; -#else - struct in_addr addrbuf; -#endif - - static const ns_dtab dtab[] = { - NS_FILES_CB(_files_ghbyaddr, NULL) - { NSSRC_DNS, _dns_ghbyaddr, NULL }, - NS_NIS_CB(_nis_ghbyaddr, NULL) -#ifdef ICMPNL - { NSSRC_ICMP, _icmp_ghbyaddr, NULL }, -#endif - { 0 } - }; - - *errp = HOST_NOT_FOUND; - - switch (af) { - case AF_INET: - if (len != sizeof(struct in_addr)) { - *errp = NO_RECOVERY; - return NULL; - } - if ((long)src & ~(sizeof(struct in_addr) - 1)) { - memcpy(&addrbuf, src, len); - src = &addrbuf; - } - if (((struct in_addr *)src)->s_addr == 0) - return NULL; - break; -#ifdef INET6 - case AF_INET6: - if (len != sizeof(struct in6_addr)) { - *errp = NO_RECOVERY; - return NULL; - } - if ((long)src & ~(sizeof(struct in6_addr) / 2 - 1)) { /*XXX*/ - memcpy(&addrbuf, src, len); - src = &addrbuf; - } - if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)src)) - return NULL; - if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)src) - || IN6_IS_ADDR_V4COMPAT((struct in6_addr *)src)) { - src = (char *)src + - (sizeof(struct in6_addr) - sizeof(struct in_addr)); - af = AF_INET; - len = sizeof(struct in_addr); - } - break; -#endif - default: - *errp = NO_RECOVERY; - return NULL; - } - - rval = nsdispatch(&hp, dtab, NSDB_HOSTS, "ghbyaddr", default_src, - src, len, af, errp); - return (rval == NS_SUCCESS) ? hp : NULL; -} - -void -freehostent(struct hostent *ptr) -{ - free(ptr); -} - -#if 0 - -/* XXX: should be deprecated */ -struct hostent * -getnodebyname(const char *name, int af, int flags) -{ - return getipnodebyname(name, af, flags, &h_errno); -} - -#ifdef __warn_references -__warn_references(getnodebyname, - "warning: getnodebyname() deprecated, " - "should use getaddrinfo() or getipnodebyname()"); -#endif - -struct hostent * -getnodebyaddr(const void *src, size_t len, int af) -{ - return getipnodebyaddr(src, len, af, &h_errno); -} - -#ifdef __warn_references -__warn_references(getnodebyaddr, - "warning: getnodebyaddr() deprecated, " - "should use getnameinfo() or getipnodebyaddr()"); -#endif - -#endif - -/* - * Private utility functions - */ - -/* - * _hpcopy: allocate and copy hostent structure - */ -static struct hostent * -_hpcopy(struct hostent *hp, int *errp) -{ - struct hostent *nhp; - char *cp, **pp; - int size, addrsize; - int nalias = 0, naddr = 0; - int al_off; - int i; - - if (hp == NULL) - return hp; - - /* count size to be allocated */ - size = sizeof(struct hostent); - if (hp->h_name != NULL) - size += strlen(hp->h_name) + 1; - if ((pp = hp->h_aliases) != NULL) { - for (i = 0; *pp != NULL; i++, pp++) { - if (**pp != '\0') { - size += strlen(*pp) + 1; - nalias++; - } - } - } - /* adjust alignment */ -#ifdef ALIGN - size = ALIGN(size); -#endif - al_off = size; - size += sizeof(char *) * (nalias + 1); -#ifdef ALIGN - addrsize = ALIGN(hp->h_length); -#else - addrsize = hp->h_length; -#endif - - if ((pp = hp->h_addr_list) != NULL) { - while (*pp++ != NULL) - naddr++; - } - size += addrsize * naddr; - size += sizeof(char *) * (naddr + 1); - - /* copy */ - if ((nhp = (struct hostent *)malloc(size)) == NULL) { - *errp = TRY_AGAIN; - return NULL; - } - cp = (char *)&nhp[1]; - if (hp->h_name != NULL) { - nhp->h_name = cp; - strcpy(cp, hp->h_name); - cp += strlen(cp) + 1; - } else - nhp->h_name = NULL; - nhp->h_aliases = (char **)((char *)nhp + al_off); - if ((pp = hp->h_aliases) != NULL) { - for (i = 0; *pp != NULL; pp++) { - if (**pp != '\0') { - nhp->h_aliases[i++] = cp; - strcpy(cp, *pp); - cp += strlen(cp) + 1; - } - } - } - nhp->h_aliases[nalias] = NULL; - cp = (char *)&nhp->h_aliases[nalias + 1]; - nhp->h_addrtype = hp->h_addrtype; - nhp->h_length = hp->h_length; - nhp->h_addr_list = (char **)cp; - if ((pp = hp->h_addr_list) != NULL) { - cp = (char *)&nhp->h_addr_list[naddr + 1]; - for (i = 0; *pp != NULL; pp++) { - nhp->h_addr_list[i++] = cp; - memcpy(cp, *pp, hp->h_length); - cp += addrsize; - } - } - nhp->h_addr_list[naddr] = NULL; - return nhp; -} - -/* - * _hpaddr: construct hostent structure with one address - */ -static struct hostent * -_hpaddr(int af, const char *name, void *addr, int *errp) -{ - struct hostent *hp, hpbuf; - char *addrs[2]; - - hp = &hpbuf; - hp->h_name = (char *)name; - hp->h_aliases = NULL; - hp->h_addrtype = af; - hp->h_length = ADDRLEN(af); - hp->h_addr_list = addrs; - addrs[0] = (char *)addr; - addrs[1] = NULL; - return _hpcopy(hp, errp); -} - -/* - * _hpmerge: merge 2 hostent structure, arguments will be freed - */ -static struct hostent * -_hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp) -{ - int i, j; - int naddr, nalias; - char **pp; - struct hostent *hp, hpbuf; - char *aliases[MAXALIASES + 1], *addrs[MAXADDRS + 1]; - union inx_addr addrbuf[MAXADDRS]; - - if (hp1 == NULL) - return hp2; - if (hp2 == NULL) - return hp1; - -#define HP(i) (i == 1 ? hp1 : hp2) - hp = &hpbuf; - hp->h_name = (hp1->h_name != NULL ? hp1->h_name : hp2->h_name); - hp->h_aliases = aliases; - nalias = 0; - for (i = 1; i <= 2; i++) { - if ((pp = HP(i)->h_aliases) == NULL) - continue; - for (; nalias < MAXALIASES && *pp != NULL; pp++) { - /* check duplicates */ - for (j = 0; j < nalias; j++) - if (strcasecmp(*pp, aliases[j]) == 0) - break; - if (j == nalias) - aliases[nalias++] = *pp; - } - } - aliases[nalias] = NULL; -#ifdef INET6 - if (hp1->h_length != hp2->h_length) { - hp->h_addrtype = AF_INET6; - hp->h_length = sizeof(struct in6_addr); - } else { -#endif - hp->h_addrtype = hp1->h_addrtype; - hp->h_length = hp1->h_length; -#ifdef INET6 - } -#endif - hp->h_addr_list = addrs; - naddr = 0; - for (i = 1; i <= 2; i++) { - if ((pp = HP(i)->h_addr_list) == NULL) - continue; - if (HP(i)->h_length == hp->h_length) { - while (naddr < MAXADDRS && *pp != NULL) - addrs[naddr++] = *pp++; - } else { - /* copy IPv4 addr as mapped IPv6 addr */ - while (naddr < MAXADDRS && *pp != NULL) { - MAPADDR(&addrbuf[naddr], *pp++); - addrs[naddr] = (char *)&addrbuf[naddr]; - naddr++; - } - } - } - addrs[naddr] = NULL; - hp = _hpcopy(hp, errp); - freehostent(hp1); - freehostent(hp2); - return hp; -} - -/* - * _hpmapv6: convert IPv4 hostent into IPv4-mapped IPv6 addresses - */ -#ifdef INET6 -static struct hostent * -_hpmapv6(struct hostent *hp, int *errp) -{ - struct hostent *hp6; - - if (hp == NULL) - return NULL; - if (hp->h_addrtype == AF_INET6) - return hp; - - /* make dummy hostent to convert IPv6 address */ - if ((hp6 = (struct hostent *)malloc(sizeof(struct hostent))) == NULL) { - *errp = TRY_AGAIN; - return NULL; - } - hp6->h_name = NULL; - hp6->h_aliases = NULL; - hp6->h_addrtype = AF_INET6; - hp6->h_length = sizeof(struct in6_addr); - hp6->h_addr_list = NULL; - return _hpmerge(hp6, hp, errp); -} -#endif - -/* - * _hpsort: sort address by sortlist - */ -static struct hostent * -_hpsort(struct hostent *hp) -{ - int i, j, n; - u_char *ap, *sp, *mp, **pp; - char t; - char order[MAXADDRS]; - int nsort = _res.nsort; - - if (hp == NULL || hp->h_addr_list[1] == NULL || nsort == 0) - return hp; - for (i = 0; (ap = (u_char *)hp->h_addr_list[i]); i++) { - for (j = 0; j < nsort; j++) { -#ifdef INET6 - if (_res_ext.sort_list[j].af != hp->h_addrtype) - continue; - sp = (u_char *)&_res_ext.sort_list[j].addr; - mp = (u_char *)&_res_ext.sort_list[j].mask; -#else - sp = (u_char *)&_res.sort_list[j].addr; - mp = (u_char *)&_res.sort_list[j].mask; -#endif - for (n = 0; n < hp->h_length; n++) { - if ((ap[n] & mp[n]) != sp[n]) - break; - } - if (n == hp->h_length) - break; - } - order[i] = j; - } - n = i; - pp = (u_char **)hp->h_addr_list; - for (i = 0; i < n - 1; i++) { - for (j = i + 1; j < n; j++) { - if (order[i] > order[j]) { - ap = pp[i]; - pp[i] = pp[j]; - pp[j] = ap; - t = order[i]; - order[i] = order[j]; - order[j] = t; - } - } - } - return hp; -} - -static char * -_hgetword(char **pp) -{ - char c, *p, *ret; - const char *sp; - static const char sep[] = "# \t\n"; - - ret = NULL; - for (p = *pp; (c = *p) != '\0'; p++) { - for (sp = sep; *sp != '\0'; sp++) { - if (c == *sp) - break; - } - if (c == '#') - p[1] = '\0'; /* ignore rest of line */ - if (ret == NULL) { - if (*sp == '\0') - ret = p; - } else { - if (*sp != '\0') { - *p++ = '\0'; - break; - } - } - } - *pp = p; - if (ret == NULL || *ret == '\0') - return NULL; - return ret; -} - -/* - * FILES (/etc/hosts) - */ - -static FILE * -_files_open(int *errp) -{ - FILE *fp; - fp = fopen(_PATH_HOSTS, "r"); - if (fp == NULL) - *errp = NO_RECOVERY; - return fp; -} - -static int -_files_ghbyname(void *rval, void *cb_data, va_list ap) -{ - const char *name; - int af; - int *errp; - int match, nalias; - char *p, *line, *addrstr, *cname; - FILE *fp; - struct hostent *rethp, *hp, hpbuf; - char *aliases[MAXALIASES + 1], *addrs[2]; - union inx_addr addrbuf; - char buf[BUFSIZ]; - int af0; - - name = va_arg(ap, const char *); - af = va_arg(ap, int); - errp = va_arg(ap, int *); - - *(struct hostent **)rval = NULL; - - if ((fp = _files_open(errp)) == NULL) - return NS_UNAVAIL; - rethp = hp = NULL; - - af0 = af; - while (fgets(buf, sizeof(buf), fp)) { - line = buf; - if ((addrstr = _hgetword(&line)) == NULL - || (cname = _hgetword(&line)) == NULL) - continue; - match = (strcasecmp(cname, name) == 0); - nalias = 0; - while ((p = _hgetword(&line)) != NULL) { - if (!match) - match = (strcasecmp(p, name) == 0); - if (nalias < MAXALIASES) - aliases[nalias++] = p; - } - if (!match) - continue; - switch (af0) { - case AF_INET: - if (inet_aton(addrstr, (struct in_addr *)&addrbuf) - != 1) { - *errp = NO_DATA; /* name found */ - continue; - } - af = af0; - break; -#ifdef INET6 - case AF_INET6: - if (inet_pton(af, addrstr, &addrbuf) != 1) { - *errp = NO_DATA; /* name found */ - continue; - } - af = af0; - break; -#endif - case AF_UNSPEC: - if (inet_aton(addrstr, (struct in_addr *)&addrbuf) - == 1) { - af = AF_INET; - break; - } -#ifdef INET6 - if (inet_pton(AF_INET6, addrstr, &addrbuf) == 1) { - af = AF_INET6; - break; - } -#endif - *errp = NO_DATA; /* name found */ - continue; - /* NOTREACHED */ - } - hp = &hpbuf; - hp->h_name = cname; - hp->h_aliases = aliases; - aliases[nalias] = NULL; - hp->h_addrtype = af; - hp->h_length = ADDRLEN(af); - hp->h_addr_list = addrs; - addrs[0] = (char *)&addrbuf; - addrs[1] = NULL; - hp = _hpcopy(hp, errp); - rethp = _hpmerge(rethp, hp, errp); - } - fclose(fp); - *(struct hostent **)rval = rethp; - return (rethp != NULL) ? NS_SUCCESS : NS_NOTFOUND; -} - -static int -_files_ghbyaddr(void *rval, void *cb_data, va_list ap) -{ - const void *addr; - int addrlen; - int af; - int *errp; - int nalias; - char *p, *line; - FILE *fp; - struct hostent *hp, hpbuf; - char *aliases[MAXALIASES + 1], *addrs[2]; - union inx_addr addrbuf; - char buf[BUFSIZ]; - - addr = va_arg(ap, const void *); - addrlen = va_arg(ap, int); - af = va_arg(ap, int); - errp = va_arg(ap, int *); - - *(struct hostent**)rval = NULL; - - if ((fp = _files_open(errp)) == NULL) - return NS_UNAVAIL; - hp = NULL; - while (fgets(buf, sizeof(buf), fp)) { - line = buf; - if ((p = _hgetword(&line)) == NULL - || (af == AF_INET - ? inet_aton(p, (struct in_addr *)&addrbuf) - : inet_pton(af, p, &addrbuf)) != 1 - || memcmp(addr, &addrbuf, addrlen) != 0 - || (p = _hgetword(&line)) == NULL) - continue; - hp = &hpbuf; - hp->h_name = p; - hp->h_aliases = aliases; - nalias = 0; - while ((p = _hgetword(&line)) != NULL) { - if (nalias < MAXALIASES) - aliases[nalias++] = p; - } - aliases[nalias] = NULL; - hp->h_addrtype = af; - hp->h_length = addrlen; - hp->h_addr_list = addrs; - addrs[0] = (char *)&addrbuf; - addrs[1] = NULL; - hp = _hpcopy(hp, errp); - break; - } - fclose(fp); - *(struct hostent **)rval = hp; - return (hp != NULL) ? NS_SUCCESS : NS_NOTFOUND; -} - -#ifdef YP -/* - * NIS - * - * XXX actually a hack, these are INET4 specific. - */ -static int -_nis_ghbyname(void *rval, void *cb_data, va_list ap) -{ - const char *name; - int af; - int *errp; - struct hostent *hp = NULL; - - name = va_arg(ap, const char *); - af = va_arg(ap, int); - errp = va_arg(ap, int *); - - if (af == AF_UNSPEC) - af = AF_INET; - if (af == AF_INET) { - hp = _gethostbynisname(name, af); - if (hp != NULL) - hp = _hpcopy(hp, errp); - } - - *(struct hostent **)rval = hp; - return (hp != NULL) ? NS_SUCCESS : NS_NOTFOUND; - -} - -static int -_nis_ghbyaddr(void *rval, void *cb_data, va_list ap) -{ - const void *addr; - int addrlen; - int af; - int *errp; - struct hostent *hp = NULL; - - addr = va_arg(ap, const void *); - addrlen = va_arg(ap, int); - af = va_arg(ap, int); - - if (af == AF_INET) { - hp = _gethostbynisaddr(addr, addrlen, af); - if (hp != NULL) - hp = _hpcopy(hp, errp); - } - *(struct hostent **)rval = hp; - return (hp != NULL) ? NS_SUCCESS : NS_NOTFOUND; -} -#endif -typedef struct __res_type_list res_type_list; - -struct __res_type_list { - res_type_list * rtl_entry; - int rtl_type; -}; - -#if PACKETSZ > 1024 -#define MAXPACKET PACKETSZ -#else -#define MAXPACKET 1024 -#endif - -typedef union { - HEADER hdr; - u_char buf[MAXPACKET]; -} querybuf; - -static struct hostent *getanswer(const querybuf *, int, const char *, int, - struct hostent *, int *); - -/* - * we don't need to take care about sorting, nor IPv4 mapped address here. - */ -static struct hostent * -getanswer(answer, anslen, qname, qtype, template, errp) - const querybuf *answer; - int anslen; - const char *qname; - int qtype; - struct hostent *template; - int *errp; -{ - const HEADER *hp; - const u_char *cp; - int n; - const u_char *eom, *erdata; - char *bp, **ap, **hap; - int type, class, buflen, ancount, qdcount; - int haveanswer, had_error; - char tbuf[MAXDNAME]; - const char *tname; - int (*name_ok)(const char *); - static char *h_addr_ptrs[MAXADDRS + 1]; - static char *host_aliases[MAXALIASES]; - static char hostbuf[8*1024]; - -#define BOUNDED_INCR(x) \ - do { \ - cp += x; \ - if (cp > eom) { \ - *errp = NO_RECOVERY; \ - return (NULL); \ - } \ - } while (0) - -#define BOUNDS_CHECK(ptr, count) \ - do { \ - if ((ptr) + (count) > eom) { \ - *errp = NO_RECOVERY; \ - return (NULL); \ - } \ - } while (0) - -/* XXX do {} while (0) cannot be put here */ -#define DNS_ASSERT(x) \ - { \ - if (!(x)) { \ - cp += n; \ - continue; \ - } \ - } - -/* XXX do {} while (0) cannot be put here */ -#define DNS_FATAL(x) \ - { \ - if (!(x)) { \ - had_error++; \ - continue; \ - } \ - } - - tname = qname; - template->h_name = NULL; - eom = answer->buf + anslen; - switch (qtype) { - case T_A: - case T_AAAA: - name_ok = res_hnok; - break; - case T_PTR: - name_ok = res_dnok; - break; - default: - return (NULL); /* XXX should be abort(); */ - } - /* - * find first satisfactory answer - */ - hp = &answer->hdr; - ancount = ntohs(hp->ancount); - qdcount = ntohs(hp->qdcount); - bp = hostbuf; - buflen = sizeof hostbuf; - cp = answer->buf; - BOUNDED_INCR(HFIXEDSZ); - if (qdcount != 1) { - *errp = NO_RECOVERY; - return (NULL); - } - n = dn_expand(answer->buf, eom, cp, bp, buflen); - if ((n < 0) || !(*name_ok)(bp)) { - *errp = NO_RECOVERY; - return (NULL); - } - BOUNDED_INCR(n + QFIXEDSZ); - 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). - */ - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - *errp = NO_RECOVERY; - return (NULL); - } - template->h_name = bp; - bp += n; - buflen -= n; - /* The qname can be abbreviated, but h_name is now absolute. */ - qname = template->h_name; - } - ap = host_aliases; - *ap = NULL; - template->h_aliases = host_aliases; - hap = h_addr_ptrs; - *hap = NULL; - template->h_addr_list = h_addr_ptrs; - haveanswer = 0; - had_error = 0; - while (ancount-- > 0 && cp < eom && !had_error) { - n = dn_expand(answer->buf, eom, cp, bp, buflen); - DNS_FATAL(n >= 0); - DNS_FATAL((*name_ok)(bp)); - cp += n; /* name */ - BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); - type = _getshort(cp); - cp += INT16SZ; /* type */ - class = _getshort(cp); - cp += INT16SZ + INT32SZ; /* class, TTL */ - n = _getshort(cp); - cp += INT16SZ; /* len */ - BOUNDS_CHECK(cp, n); - erdata = cp + n; - DNS_ASSERT(class == C_IN); - 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); - DNS_FATAL(n >= 0); - DNS_FATAL((*name_ok)(tbuf)); - cp += n; - if (cp != erdata) { - *errp = NO_RECOVERY; - return (NULL); - } - /* Store alias. */ - *ap++ = bp; - n = strlen(bp) + 1; /* for the \0 */ - DNS_FATAL(n < MAXHOSTNAMELEN); - bp += n; - buflen -= n; - /* Get canonical name. */ - n = strlen(tbuf) + 1; /* for the \0 */ - DNS_FATAL(n <= buflen); - DNS_FATAL(n < MAXHOSTNAMELEN); - strcpy(bp, tbuf); - template->h_name = bp; - bp += n; - buflen -= n; - continue; - } - if (qtype == T_PTR && type == T_CNAME) { - n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); - if (n < 0 || !res_dnok(tbuf)) { - had_error++; - continue; - } - cp += n; - if (cp != erdata) { - *errp = NO_RECOVERY; - return (NULL); - } - /* Get canonical name. */ - n = strlen(tbuf) + 1; /* for the \0 */ - if (n > buflen || n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - strcpy(bp, tbuf); - tname = bp; - bp += n; - buflen -= n; - continue; - } - DNS_ASSERT(type == qtype); - switch (type) { - case T_PTR: - DNS_ASSERT(strcasecmp(tname, bp) == 0); - n = dn_expand(answer->buf, eom, cp, bp, buflen); - DNS_FATAL(n >= 0); - DNS_FATAL(res_hnok(bp)); -#if MULTI_PTRS_ARE_ALIASES - cp += n; - if (cp != erdata) { - *errp = NO_RECOVERY; - return (NULL); - } - if (!haveanswer) - template->h_name = bp; - else if (ap < &host_aliases[MAXALIASES-1]) - *ap++ = bp; - else - n = -1; - if (n != -1) { - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - had_error++; - break; - } - bp += n; - buflen -= n; - } - break; -#else - template->h_name = bp; - *errp = NETDB_SUCCESS; - return (template); -#endif - case T_A: - case T_AAAA: - DNS_ASSERT(strcasecmp(template->h_name, bp) == 0); - DNS_ASSERT(n == template->h_length); - if (!haveanswer) { - int nn; - - template->h_name = bp; - nn = strlen(bp) + 1; /* for the \0 */ - bp += nn; - buflen -= nn; - } -#ifdef ALIGN - bp = (char *)ALIGN(bp); -#else - bp = (char *)(bp); -#endif - - DNS_FATAL(bp + n < &hostbuf[sizeof hostbuf]); - DNS_ASSERT(hap < &h_addr_ptrs[MAXADDRS-1]); -#ifdef FILTER_V4MAPPED - if (type == T_AAAA) { - struct in6_addr in6; - memcpy(&in6, cp, sizeof(in6)); - DNS_ASSERT(IN6_IS_ADDR_V4MAPPED(&in6) == 0); - } -#endif - bcopy(cp, *hap++ = bp, n); - bp += n; - buflen -= n; - cp += n; - if (cp != erdata) { - *errp = NO_RECOVERY; - return (NULL); - } - break; - default: - abort(); - } - if (!had_error) - haveanswer++; - } - if (haveanswer) { - *ap = NULL; - *hap = NULL; - if (!template->h_name) { - n = strlen(qname) + 1; /* for the \0 */ - if (n > buflen || n >= MAXHOSTNAMELEN) - goto no_recovery; - strcpy(bp, qname); - template->h_name = bp; - bp += n; - buflen -= n; - } - *errp = NETDB_SUCCESS; - return (template); - } - no_recovery: - *errp = NO_RECOVERY; - return (NULL); - -#undef BOUNDED_INCR -#undef BOUNDS_CHECK -#undef DNS_ASSERT -#undef DNS_FATAL -} - -/* res_search() variant with multiple query support. */ -static struct hostent * -_res_search_multi(name, rtl, errp) - const char *name; /* domain name */ - struct __res_type_list *rtl; /* list of query types */ - int *errp; -{ - const char *cp, * const *domain; - struct hostent *hp0 = NULL, *hp; - struct hostent hpbuf; - u_int dots; - int trailing_dot, ret, saved_herrno; - int got_nodata = 0, got_servfail = 0, tried_as_is = 0; - struct __res_type_list *rtl0 = rtl; - querybuf buf; - - if ((_res.options & RES_INIT) == 0 && res_init() == -1) { - *errp = NETDB_INTERNAL; - return (NULL); - } - dots = 0; - for (cp = name; *cp; cp++) - dots += (*cp == '.'); - trailing_dot = 0; - if (cp > name && *--cp == '.') - trailing_dot++; - - /* If there aren't any dots, it could be a user-level alias */ - if (!dots && (cp = hostalias(name)) != NULL) { - for(rtl = rtl0; rtl != NULL; - rtl = rtl->rtl_entry) { - ret = res_query(cp, C_IN, rtl->rtl_type, buf.buf, - sizeof(buf.buf)); - if (ret > 0) { - hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA) - ? AF_INET6 : AF_INET; - hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype); - hp = getanswer(&buf, ret, name, rtl->rtl_type, - &hpbuf, errp); - if (!hp) - continue; - hp = _hpcopy(&hpbuf, errp); - hp0 = _hpmerge(hp0, hp, errp); - } - } - return (hp0); - } - - /* - * If there are dots in the name already, let's just give it a try - * 'as is'. The threshold can be set with the "ndots" option. - */ - saved_herrno = -1; - if (dots >= _res.ndots) { - for(rtl = rtl0; rtl != NULL; - rtl = rtl->rtl_entry) { - ret = res_querydomain(name, NULL, C_IN, rtl->rtl_type, - buf.buf, sizeof(buf.buf)); - if (ret > 0) { - hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA) - ? AF_INET6 : AF_INET; - hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype); - hp = getanswer(&buf, ret, name, rtl->rtl_type, - &hpbuf, errp); - if (!hp) - continue; - hp = _hpcopy(&hpbuf, errp); - hp0 = _hpmerge(hp0, hp, errp); - } - } - if (hp0 != NULL) - return (hp0); - saved_herrno = *errp; - tried_as_is++; - } - - /* - * We do at least one level of search if - * - there is no dot and RES_DEFNAME is set, or - * - there is at least one dot, there is no trailing dot, - * and RES_DNSRCH is set. - */ - if ((!dots && (_res.options & RES_DEFNAMES)) || - (dots && !trailing_dot && (_res.options & RES_DNSRCH))) { - int done = 0; - - for (domain = (const char * const *)_res.dnsrch; - *domain && !done; - domain++) { - - for(rtl = rtl0; rtl != NULL; - rtl = rtl->rtl_entry) { - ret = res_querydomain(name, *domain, C_IN, - rtl->rtl_type, - buf.buf, sizeof(buf.buf)); - if (ret > 0) { - hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA) - ? AF_INET6 : AF_INET; - hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype); - hp = getanswer(&buf, ret, name, - rtl->rtl_type, &hpbuf, errp); - if (!hp) - continue; - hp = _hpcopy(&hpbuf, errp); - hp0 = _hpmerge(hp0, hp, errp); - } - } - if (hp0 != NULL) - return (hp0); - - /* - * If no server present, give up. - * If name isn't found in this domain, - * keep trying higher domains in the search list - * (if that's enabled). - * On a NO_DATA error, keep trying, otherwise - * a wildcard entry of another type could keep us - * from finding this entry higher in the domain. - * If we get some other error (negative answer or - * server failure), then stop searching up, - * but try the input name below in case it's - * fully-qualified. - */ - if (errno == ECONNREFUSED) { - *errp = TRY_AGAIN; - return (NULL); - } - - switch (*errp) { - case NO_DATA: - got_nodata++; - /* FALLTHROUGH */ - case HOST_NOT_FOUND: - /* keep trying */ - break; - case TRY_AGAIN: - if (buf.hdr.rcode == SERVFAIL) { - /* try next search element, if any */ - got_servfail++; - break; - } - /* FALLTHROUGH */ - default: - /* anything else implies that we're done */ - done++; - } - - /* if we got here for some reason other than DNSRCH, - * we only wanted one iteration of the loop, so stop. - */ - if (!(_res.options & RES_DNSRCH)) - done++; - } - } - - /* - * If we have not already tried the name "as is", do that now. - * note that we do this regardless of how many dots were in the - * name or whether it ends with a dot unless NOTLDQUERY is set. - */ - if (!tried_as_is && (dots || !(_res.options & RES_NOTLDQUERY))) { - for(rtl = rtl0; rtl != NULL; - rtl = rtl->rtl_entry) { - ret = res_querydomain(name, NULL, C_IN, rtl->rtl_type, - buf.buf, sizeof(buf.buf)); - if (ret > 0) { - hpbuf.h_addrtype = (rtl->rtl_type == T_AAAA) - ? AF_INET6 : AF_INET; - hpbuf.h_length = ADDRLEN(hpbuf.h_addrtype); - hp = getanswer(&buf, ret, name, rtl->rtl_type, - &hpbuf, errp); - if (!hp) - continue; - hp = _hpcopy(&hpbuf, errp); - hp0 = _hpmerge(hp0, hp, errp); - } - } - if (hp0 != NULL) - return (hp0); - } - - /* if we got here, we didn't satisfy the search. - * if we did an initial full query, return that query's h_errno - * (note that we wouldn't be here if that query had succeeded). - * else if we ever got a nodata, send that back as the reason. - * else send back meaningless h_errno, that being the one from - * the last DNSRCH we did. - */ - if (saved_herrno != -1) - *errp = saved_herrno; - else if (got_nodata) - *errp = NO_DATA; - else if (got_servfail) - *errp = TRY_AGAIN; - return (NULL); -} - -static int -_dns_ghbyname(void *rval, void *cb_data, va_list ap) -{ - const char *name; - int af; - int *errp; - res_type_list *rtl, rtl4; -#ifdef INET6 - res_type_list rtl6; -#endif - - name = va_arg(ap, const char *); - af = va_arg(ap, int); - errp = va_arg(ap, int *); - -#ifdef INET6 - switch (af) { - case AF_UNSPEC: - rtl4.rtl_entry = NULL; rtl4.rtl_type = T_A; - rtl6.rtl_entry = &rtl4; rtl6.rtl_type = T_AAAA; - rtl = &rtl6; - break; - case AF_INET6: - rtl6.rtl_entry = NULL; rtl6.rtl_type = T_AAAA; - rtl = &rtl6; - break; - case AF_INET: - rtl4.rtl_entry = NULL; rtl4.rtl_type = T_A; - rtl = &rtl4; - break; - } -#else - (&rtl4)->rtl_entry = NULL; - rtl4.rtl_type = T_A; - rtl = &rtl4; -#endif - *(struct hostent **)rval = _res_search_multi(name, rtl, errp); - return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND; -} - -static int -_dns_ghbyaddr(void *rval, void *cb_data, va_list ap) -{ - const void *addr; - int addrlen; - int af; - int *errp; - int n; - struct hostent *hp; - u_char c, *cp; - char *bp; - struct hostent hbuf; - int na; -#ifdef INET6 - static const char hex[] = "0123456789abcdef"; -#endif - querybuf buf; - char qbuf[MAXDNAME+1]; - char *hlist[2]; - - addr = va_arg(ap, const void *); - addrlen = va_arg(ap, int); - af = va_arg(ap, int); - errp = va_arg(ap, int *); - - *(struct hostent **)rval = NULL; - -#ifdef INET6 - /* XXX */ - if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr)) - return NS_NOTFOUND; -#endif - - if ((_res.options & RES_INIT) == 0) { - if (res_init() < 0) { - *errp = h_errno; - return NS_UNAVAIL; - } - } - memset(&hbuf, 0, sizeof(hbuf)); - hbuf.h_name = NULL; - hbuf.h_addrtype = af; - hbuf.h_length = addrlen; - na = 0; - - /* XXX assumes that MAXDNAME is big enough */ - n = 0; - bp = qbuf; - cp = (u_char *)addr+addrlen-1; - switch (af) { -#ifdef INET6 - case AF_INET6: - for (; n < addrlen; n++, cp--) { - c = *cp; - *bp++ = hex[c & 0xf]; - *bp++ = '.'; - *bp++ = hex[c >> 4]; - *bp++ = '.'; - } - strcpy(bp, "ip6.int"); - break; -#endif - default: - for (; n < addrlen; n++, cp--) { - c = *cp; - if (c >= 100) - *bp++ = '0' + c / 100; - if (c >= 10) - *bp++ = '0' + (c % 100) / 10; - *bp++ = '0' + c % 10; - *bp++ = '.'; - } - strcpy(bp, "in-addr.arpa"); - break; - } - - n = res_query(qbuf, C_IN, T_PTR, buf.buf, sizeof buf.buf); - if (n < 0) { - *errp = h_errno; - return NS_UNAVAIL; - } - hp = getanswer(&buf, n, qbuf, T_PTR, &hbuf, errp); - if (!hp) - return NS_NOTFOUND; - hbuf.h_addrtype = af; - hbuf.h_length = addrlen; - hbuf.h_addr_list = hlist; - hlist[0] = (char *)addr; - hlist[1] = NULL; - *(struct hostent **)rval = _hpcopy(&hbuf, errp); - return NS_SUCCESS; -} - -#if 0 // keep gcc happy -static void -_dns_shent(int stayopen) -{ - if ((_res.options & RES_INIT) == 0) { - if (res_init() < 0) - return; - } - if (stayopen) - _res.options |= RES_STAYOPEN | RES_USEVC; -} - -static void -_dns_ehent(void) -{ - _res.options &= ~(RES_STAYOPEN | RES_USEVC); - res_close(); -} -#endif - -#ifdef ICMPNL - -/* - * experimental: - * draft-ietf-ipngwg-icmp-namelookups-02.txt - * ifindex is assumed to be encoded in addr. - */ -#include <sys/uio.h> -#include <netinet/ip6.h> -#include <netinet/icmp6.h> - -struct _icmp_host_cache { - struct _icmp_host_cache *hc_next; - int hc_ifindex; - struct in6_addr hc_addr; - char *hc_name; -}; - -static char * -_icmp_fqdn_query(const struct in6_addr *addr, int ifindex) -{ - int s; - struct icmp6_filter filter; - struct msghdr msg; - struct cmsghdr *cmsg; - struct in6_pktinfo *pkt; - char cbuf[256]; - char buf[1024]; - int cc; - struct icmp6_fqdn_query *fq; - struct icmp6_fqdn_reply *fr; - struct _icmp_host_cache *hc; - struct sockaddr_in6 sin6; - struct iovec iov; - fd_set s_fds, fds; - struct timeval tout; - int len; - char *name; - static int pid; - static struct _icmp_host_cache *hc_head; - - for (hc = hc_head; hc; hc = hc->hc_next) { - if (hc->hc_ifindex == ifindex - && IN6_ARE_ADDR_EQUAL(&hc->hc_addr, addr)) - return hc->hc_name; - } - - if (pid == 0) - pid = getpid(); - - ICMP6_FILTER_SETBLOCKALL(&filter); - ICMP6_FILTER_SETPASS(ICMP6_FQDN_REPLY, &filter); - - FD_ZERO(&s_fds); - tout.tv_sec = 0; - tout.tv_usec = 200000; /*XXX: 200ms*/ - - fq = (struct icmp6_fqdn_query *)buf; - fq->icmp6_fqdn_type = ICMP6_FQDN_QUERY; - fq->icmp6_fqdn_code = 0; - fq->icmp6_fqdn_cksum = 0; - fq->icmp6_fqdn_id = (u_short)pid; - fq->icmp6_fqdn_unused = 0; - fq->icmp6_fqdn_cookie[0] = 0; - fq->icmp6_fqdn_cookie[1] = 0; - - memset(&sin6, 0, sizeof(sin6)); - sin6.sin6_family = AF_INET6; - sin6.sin6_addr = *addr; - - memset(&msg, 0, sizeof(msg)); - msg.msg_name = (caddr_t)&sin6; - msg.msg_namelen = sizeof(sin6); - msg.msg_iov = &iov; - msg.msg_iovlen = 1; - msg.msg_control = NULL; - msg.msg_controllen = 0; - iov.iov_base = (caddr_t)buf; - iov.iov_len = sizeof(struct icmp6_fqdn_query); - - if (ifindex) { - msg.msg_control = cbuf; - msg.msg_controllen = sizeof(cbuf); - cmsg = CMSG_FIRSTHDR(&msg); - cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); - cmsg->cmsg_level = IPPROTO_IPV6; - cmsg->cmsg_type = IPV6_PKTINFO; - pkt = (struct in6_pktinfo *)&cmsg[1]; - memset(&pkt->ipi6_addr, 0, sizeof(struct in6_addr)); - pkt->ipi6_ifindex = ifindex; - cmsg = CMSG_NXTHDR(&msg, cmsg); - msg.msg_controllen = (char *)cmsg - cbuf; - } - - if ((s = socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) - return NULL; - (void)setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, - (char *)&filter, sizeof(filter)); - cc = _sendmsg(s, &msg, 0); - if (cc < 0) { - close(s); - return NULL; - } - FD_SET(s, &s_fds); - for (;;) { - fds = s_fds; - if (select(s + 1, &fds, NULL, NULL, &tout) <= 0) { - close(s); - return NULL; - } - len = sizeof(sin6); - cc = _recvfrom(s, buf, sizeof(buf), 0, - (struct sockaddr *)&sin6, &len); - if (cc <= 0) { - close(s); - return NULL; - } - if (cc < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) - continue; - if (!IN6_ARE_ADDR_EQUAL(addr, &sin6.sin6_addr)) - continue; - fr = (struct icmp6_fqdn_reply *)(buf + sizeof(struct ip6_hdr)); - if (fr->icmp6_fqdn_type == ICMP6_FQDN_REPLY) - break; - } - close(s); - if (fr->icmp6_fqdn_cookie[1] != 0) { - /* rfc1788 type */ - name = buf + sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 4; - len = (buf + cc) - name; - } else { - len = fr->icmp6_fqdn_namelen; - name = fr->icmp6_fqdn_name; - } - if (len <= 0) - return NULL; - name[len] = 0; - - if ((hc = (struct _icmp_host_cache *)malloc(sizeof(*hc))) == NULL) - return NULL; - /* XXX: limit number of cached entries */ - hc->hc_ifindex = ifindex; - hc->hc_addr = *addr; - hc->hc_name = strdup(name); - hc->hc_next = hc_head; - hc_head = hc; - return hc->hc_name; -} - -static struct hostent * -_icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp) -{ - char *hname; - int ifindex; - struct in6_addr addr6; - - if (af != AF_INET6) { - /* - * Note: rfc1788 defines Who Are You for IPv4, - * but no one implements it. - */ - return NULL; - } - - memcpy(&addr6, addr, addrlen); - ifindex = (addr6.s6_addr[2] << 8) | addr6.s6_addr[3]; - addr6.s6_addr[2] = addr6.s6_addr[3] = 0; - - if (!IN6_IS_ADDR_LINKLOCAL(&addr6)) - return NULL; /*XXX*/ - - if ((hname = _icmp_fqdn_query(&addr6, ifindex)) == NULL) - return NULL; - return _hpaddr(af, hname, &addr6, errp); -} -#endif /* ICMPNL */ |