diff options
Diffstat (limited to 'lib/libc/net/name6.c')
| -rw-r--r-- | lib/libc/net/name6.c | 1305 |
1 files changed, 0 insertions, 1305 deletions
diff --git a/lib/libc/net/name6.c b/lib/libc/net/name6.c deleted file mode 100644 index e87f40f..0000000 --- a/lib/libc/net/name6.c +++ /dev/null @@ -1,1305 +0,0 @@ -/* - * 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. - * - * $FreeBSD$ - */ -/* $Id: name6.c,v 1.9 1999/10/29 03:04:26 itojun Exp $ */ -/* - * 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/param.h> -#include <sys/socket.h> -#include <sys/time.h> -#include <netinet/in.h> - -#include <arpa/inet.h> -#include <arpa/nameser.h> - -#include <netdb.h> -#include <resolv.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#ifndef _PATH_HOSTS -#define _PATH_HOSTS "/etc/hosts" -#endif - -#ifndef MAXALIASES -#define MAXALIASES 10 -#endif -#ifndef MAXADDRS -#define MAXADDRS 20 -#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 -}; - -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 struct hostent *_files_ghbyname(const char *name, int af, int *errp); -static struct hostent *_files_ghbyaddr(const void *addr, int addrlen, int af, int *errp); -static void _files_shent(int stayopen); -static void _files_ehent(void); -static struct hostent *_nis_ghbyname(const char *name, int af, int *errp); -static struct hostent *_nis_ghbyaddr(const void *addr, int addrlen, int af, int *errp); -static struct hostent *_dns_ghbyname(const char *name, int af, int *errp); -static struct hostent *_dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp); -static void _dns_shent(int stayopen); -static void _dns_ehent(void); -#ifdef ICMPNL -static struct hostent *_icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp); -#endif /* ICMPNL */ - -/* - * Select order host function. - */ -#define MAXHOSTCONF 4 - -#ifndef HOSTCONF -# define HOSTCONF "/etc/host.conf" -#endif /* !HOSTCONF */ - -struct _hostconf { - struct hostent *(*byname)(const char *name, int af, int *errp); - struct hostent *(*byaddr)(const void *addr, int addrlen, int af, int *errp); -}; - -/* default order */ -static struct _hostconf _hostconf[MAXHOSTCONF] = { - { _dns_ghbyname, _dns_ghbyaddr }, - { _files_ghbyname, _files_ghbyaddr }, -#ifdef ICMPNL - { NULL, _icmp_ghbyaddr }, -#endif /* ICMPNL */ -}; - -static int _hostconf_init_done; -static void _hostconf_init(void); - -/* - * Initialize hostconf structure. - */ - -static void -_hostconf_init(void) -{ - FILE *fp; - int n; - char *p, *line; - char buf[BUFSIZ]; - - _hostconf_init_done = 1; - n = 0; - p = HOSTCONF; - if ((fp = fopen(p, "r")) == NULL) - return; - while (n < MAXHOSTCONF && fgets(buf, sizeof(buf), fp)) { - line = buf; - if ((p = _hgetword(&line)) == NULL) - continue; - do { - if (strcmp(p, "hosts") == 0 - || strcmp(p, "local") == 0 - || strcmp(p, "file") == 0 - || strcmp(p, "files") == 0) { - _hostconf[n].byname = _files_ghbyname; - _hostconf[n].byaddr = _files_ghbyaddr; - n++; - } - else if (strcmp(p, "dns") == 0 - || strcmp(p, "bind") == 0) { - _hostconf[n].byname = _dns_ghbyname; - _hostconf[n].byaddr = _dns_ghbyaddr; - n++; - } - else if (strcmp(p, "nis") == 0) { - _hostconf[n].byname = _nis_ghbyname; - _hostconf[n].byaddr = _nis_ghbyaddr; - n++; - } -#ifdef ICMPNL - else if (strcmp(p, "icmp") == 0) { - _hostconf[n].byname = NULL; - _hostconf[n].byaddr = _icmp_ghbyaddr; - n++; - } -#endif /* ICMPNL */ - } while ((p = _hgetword(&line)) != NULL); - } - fclose(fp); - if (n < 0) { - /* no keyword found. do not change default configuration */ - return; - } - for (; n < MAXHOSTCONF; n++) { - _hostconf[n].byname = NULL; - _hostconf[n].byaddr = NULL; - } -} - -/* - * 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, getipnodebyadr, freehostent - */ - -static struct hostent * -_ghbyname(const char *name, int af, int flags, int *errp) -{ - struct hostent *hp; - int i; - - if (flags & AI_ADDRCONFIG) { - int s; - - if ((s = socket(af, SOCK_DGRAM, 0)) < 0) - return NULL; - /* - * 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. - */ - _close(s); - } - - for (i = 0; i < MAXHOSTCONF; i++) { - if (_hostconf[i].byname - && (hp = (*_hostconf[i].byname)(name, af, errp)) - != NULL) - return hp; - } - - return NULL; -} - -struct hostent * -getipnodebyname(const char *name, int af, int flags, int *errp) -{ - struct hostent *hp; - union inx_addr addrbuf; - - if (af != AF_INET -#ifdef INET6 - && af != AF_INET6 -#endif - ) - { - *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); - } - - if (!_hostconf_init_done) - _hostconf_init(); - - *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 * -getipnodebyaddr(const void *src, size_t len, int af, int *errp) -{ - struct hostent *hp; - int i; -#ifdef INET6 - struct in6_addr addrbuf; -#else - struct in_addr addrbuf; -#endif - - *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; - } - - if (!_hostconf_init_done) - _hostconf_init(); - for (i = 0; i < MAXHOSTCONF; i++) { - if (_hostconf[i].byaddr - && (hp = (*_hostconf[i].byaddr)(src, len, af, errp)) != NULL) - return hp; - } - - return 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 && *hp->h_name != '\0') - 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 */ - size = ALIGN(size); - al_off = size; - size += sizeof(char *) * (nalias + 1); - addrsize = ALIGN(hp->h_length); - 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 && *hp->h_name != '\0') { - 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 struct hostent * -_files_ghbyname(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]; - - if ((fp = _files_open(errp)) == NULL) - return NULL; - rethp = hp = NULL; - - 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; - if ((af == AF_INET - ? inet_aton(addrstr, (struct in_addr *)&addrbuf) - : inet_pton(af, addrstr, &addrbuf)) != 1) { - *errp = NO_DATA; /* name found */ - continue; - } - 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); - return rethp; -} - -static struct hostent * -_files_ghbyaddr(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]; - - if ((fp = _files_open(errp)) == NULL) - return NULL; - 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); - return hp; -} - -/* - * NIS - * - * XXX actually a hack, these are INET4 specific. - */ -static struct hostent * -_nis_ghbyname(const char *name, int af, int *errp) -{ - struct hostent *hp = NULL; - - if (af == AF_INET) { - hp = _gethostbynisname(name, af); - if (hp != NULL) - hp = _hpcopy(hp, errp); - } - return (hp); - -} - -static struct hostent * -_nis_ghbyaddr(const void *addr, int addrlen, int af, int *errp) -{ - struct hostent *hp = NULL; - - if (af == AF_INET) { - hp = _gethostbynisaddr(addr, addrlen, af); - if (hp != NULL) - hp = _hpcopy(hp, errp); - } - return (hp); -} - -#ifdef DEBUG -#define DNS_ASSERT(X) if (!(X)) { fprintf(stderr, "ASSFAIL: %s %d: %s\n", __FILE__, __LINE__, #X); goto badanswer; } -#else -#define DNS_ASSERT(X) if (!(X)) { goto badanswer; } -#endif - -static struct hostent * -_dns_ghbyname(const char *name, int af, int *errp) -{ - int n; - u_char answer[BUFSIZ]; - char tbuf[MAXDNAME+1]; - HEADER *hp; - u_char *cp, *eom; - int qtype; - int type, class, ancount, qdcount; - u_long ttl; - char hostbuf[BUFSIZ]; - char *bp; - char *alist[MAXALIASES]; - char *hlist[MAXADDRS]; - struct hostent hbuf; - int buflen; - int na, nh; - - if ((_res.options & RES_INIT) == 0) { - if (res_init() < 0) { - *errp = h_errno; - return NULL; - } - } - hbuf.h_aliases = alist; - hbuf.h_addrtype = af; - hbuf.h_length = ADDRLEN(af); - hbuf.h_addr_list = hlist; - na = nh = 0; - -#ifdef INET6 - qtype = (af == AF_INET6 ? T_AAAA : T_A); -#else - qtype = T_A; -#endif - n = res_search(name, C_IN, qtype, answer, sizeof(answer)); - if (n < 0) { - *errp = h_errno; - return NULL; - } - hp = (HEADER *)answer; - eom = answer + n; - ancount = ntohs(hp->ancount); - qdcount = ntohs(hp->qdcount); - DNS_ASSERT(qdcount == 1); - cp = answer + sizeof(HEADER); - bp = hostbuf; - buflen = sizeof(hostbuf); - - n = dn_expand(answer, eom, cp, bp, buflen); - DNS_ASSERT(n >= 0); - cp += n + QFIXEDSZ; - hbuf.h_name = bp; - n = strlen(bp) + 1; - bp += n; - buflen -= n; - while (ancount-- > 0 && cp < eom) { - n = dn_expand(answer, eom, cp, bp, buflen); - DNS_ASSERT(n >= 0); - cp += n; /* name */ - type = _getshort(cp); - cp += 2; /* type */ - class = _getshort(cp); - cp += 2; /* class */ - ttl = _getlong(cp); - cp += 4; /* ttl */ - n = _getshort(cp); - cp += 2; /* len */ - DNS_ASSERT(class == C_IN); - switch (type) { - case T_CNAME: - if (na >= MAXALIASES-1) { - cp += n; - break; - } - n = dn_expand(answer, eom, cp, tbuf, sizeof(tbuf)); - DNS_ASSERT(n >= 0); - cp += n; - /* alias */ - alist[na++] = bp; - n = strlen(bp) + 1; - bp += n; - buflen -= n; - /* canon */ - n = strlen(tbuf) + 1; - DNS_ASSERT(n < buflen); - strcpy(bp, tbuf); - hbuf.h_name = bp; - bp += n; - buflen -= n; - break; - case T_A: -#ifdef INET6 - case T_AAAA: -#endif - DNS_ASSERT(type == qtype); - bp = (char *)ALIGN(bp); - DNS_ASSERT(n == hbuf.h_length); - DNS_ASSERT(n < buflen); - if (nh < MAXADDRS-1) { - hlist[nh++] = bp; - memcpy(bp, cp, n); - bp += n; - buflen -= n; - } - cp += n; - break; - default: - DNS_ASSERT(0); - cp += n; - break; - } - } - if (nh == 0) { - badanswer: - *errp = NO_RECOVERY; - return NULL; - } - alist[na] = NULL; - hlist[nh] = NULL; - return _hpcopy(&hbuf, errp); -} - -static struct hostent * -_dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp) -{ - int n; - u_char answer[BUFSIZ]; - HEADER *hp; - u_char c, *cp, *eom; - int type, class, ancount, qdcount; - u_long ttl; - char hostbuf[BUFSIZ]; - char *bp; - char *alist[MAXALIASES]; - char *hlist[2]; - struct hostent hbuf; - int buflen; - int na; -#ifdef INET6 - static const char hex[] = "0123456789abcdef"; -#endif - -#ifdef INET6 - /* XXX */ - if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr)) - return NULL; -#endif - - if ((_res.options & RES_INIT) == 0) { - if (res_init() < 0) { - *errp = h_errno; - return NULL; - } - } - hbuf.h_name = NULL; - hbuf.h_aliases = alist; - hbuf.h_addrtype = af; - hbuf.h_length = addrlen; - hbuf.h_addr_list = hlist; - hlist[0] = (char *)addr; - hlist[1] = NULL; - na = 0; - - n = 0; - bp = hostbuf; - 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(hostbuf, C_IN, T_PTR, answer, sizeof(answer)); - if (n < 0) { - *errp = h_errno; - return NULL; - } - hp = (HEADER *)answer; - eom = answer + n; - ancount = ntohs(hp->ancount); - qdcount = ntohs(hp->qdcount); - DNS_ASSERT(qdcount == 1); - cp = answer + sizeof(HEADER); - bp = hostbuf; - buflen = sizeof(hostbuf); - - n = dn_expand(answer, eom, cp, bp, buflen); - DNS_ASSERT(n >= 0); - cp += n + QFIXEDSZ; - while (ancount-- > 0 && cp < eom) { - n = dn_expand(answer, eom, cp, bp, buflen); - DNS_ASSERT(n >= 0); - cp += n; /* name */ - type = _getshort(cp); - cp += 2; /* type */ - class = _getshort(cp); - cp += 2; /* class */ - ttl = _getlong(cp); - cp += 4; /* ttl */ - n = _getshort(cp); - cp += 2; /* len */ - DNS_ASSERT(class == C_IN); - switch (type) { - case T_PTR: - n = dn_expand(answer, eom, cp, bp, buflen); - DNS_ASSERT(n >= 0); - cp += n; - if (na >= MAXALIASES-1) - break; - if (hbuf.h_name == NULL) - hbuf.h_name = bp; - else - alist[na++] = bp; - n = strlen(bp) + 1; - bp += n; - buflen -= n; - break; - case T_CNAME: - cp += n; - break; - default: - badanswer: - *errp = NO_RECOVERY; - return NULL; - } - } - if (hbuf.h_name == NULL) { - *errp = h_errno; - return NULL; - } - alist[na] = NULL; - return _hpcopy(&hbuf, errp); -} - -#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 */ |
