diff options
Diffstat (limited to 'libc/netbsd/gethnamaddr.c')
| -rw-r--r-- | libc/netbsd/gethnamaddr.c | 1408 |
1 files changed, 0 insertions, 1408 deletions
diff --git a/libc/netbsd/gethnamaddr.c b/libc/netbsd/gethnamaddr.c deleted file mode 100644 index 5b2f987..0000000 --- a/libc/netbsd/gethnamaddr.c +++ /dev/null @@ -1,1408 +0,0 @@ -/* $NetBSD: gethnamaddr.c,v 1.70 2006/03/22 00:03:51 christos Exp $ */ - -/* - * ++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. 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-- - */ - -#include <sys/cdefs.h> -#include <sys/types.h> - -#include <sys/param.h> -#include <sys/socket.h> -#include <sys/un.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#include "arpa_nameser.h" -#include "resolv_private.h" -#include "resolv_cache.h" -#include <assert.h> -#include <ctype.h> -#include <errno.h> -#include <netdb.h> -#include <stdarg.h> -#include <stdio.h> -#include <strings.h> -#include <syslog.h> -#include <unistd.h> - -#ifndef LOG_AUTH -# define LOG_AUTH 0 -#endif - -#define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */ - -#include "nsswitch.h" -#include <stdlib.h> -#include <string.h> - -// This should be synchronized to ResponseCode.h -static const int DnsProxyQueryResult = 222; - -static const char const AskedForGot[] = - "gethostby*.getanswer: asked for \"%s\", got \"%s\""; - -#define MAXPACKET (64*1024) - -typedef union { - HEADER hdr; - u_char buf[MAXPACKET]; -} querybuf; - -typedef union { - int32_t al; - char ac; -} align; - -#ifdef DEBUG -static void dprintf(const char *, res_state, ...) - __attribute__((__format__(__printf__, 1, 3))); -#endif -static struct hostent *getanswer(const querybuf *, int, const char *, int, - res_state); -static void map_v4v6_address(const char *, char *); -static void map_v4v6_hostent(struct hostent *, char **, char *); -static void addrsort(char **, int, res_state); - -static void _sethtent(int); -static void _endhtent(void); -static struct hostent *_gethtent(void); -void ht_sethostent(int); -void ht_endhostent(void); -struct hostent *ht_gethostbyname(char *); -struct hostent *ht_gethostbyaddr(const char *, int, int); -void dns_service(void); -#undef dn_skipname -int dn_skipname(const u_char *, const u_char *); -static int _gethtbyaddr(void *, void *, va_list); -static int _gethtbyname(void *, void *, va_list); -static struct hostent *_gethtbyname2(const char *, int); -static int _dns_gethtbyaddr(void *, void *, va_list); -static int _dns_gethtbyname(void *, void *, va_list); - -static struct hostent *gethostbyname_internal(const char *, int, res_state, const char *, int); - -static const ns_src default_dns_files[] = { - { NSSRC_FILES, NS_SUCCESS }, - { NSSRC_DNS, NS_SUCCESS }, - { 0, 0 } -}; - - -#ifdef DEBUG -static void -dprintf(const char *msg, res_state res, ...) -{ - assert(msg != NULL); - - if (res->options & RES_DEBUG) { - int save = errno; - va_list ap; - - va_start (ap, res); - vprintf(msg, ap); - va_end (ap); - - errno = save; - } -} -#else -# define dprintf(msg, res, num) ((void)0) /*nada*/ -#endif - -#define BOUNDED_INCR(x) \ - do { \ - cp += (x); \ - if (cp > eom) { \ - h_errno = NO_RECOVERY; \ - return NULL; \ - } \ - } while (/*CONSTCOND*/0) - -#define BOUNDS_CHECK(ptr, count) \ - do { \ - if ((ptr) + (count) > eom) { \ - h_errno = NO_RECOVERY; \ - return NULL; \ - } \ - } while (/*CONSTCOND*/0) - -static struct hostent * -getanswer(const querybuf *answer, int anslen, const char *qname, int qtype, - res_state res) -{ - const HEADER *hp; - const u_char *cp; - int n; - const u_char *eom, *erdata; - char *bp, **ap, **hap, *ep; - int type, class, ancount, qdcount; - int haveanswer, had_error; - int toobig = 0; - char tbuf[MAXDNAME]; - const char *tname; - int (*name_ok)(const char *); - res_static rs = __res_get_static(); - - assert(answer != NULL); - assert(qname != NULL); - - tname = qname; - rs->host.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 = rs->hostbuf; - ep = rs->hostbuf + sizeof rs->hostbuf; - cp = answer->buf; - BOUNDED_INCR(HFIXEDSZ); - if (qdcount != 1) { - h_errno = NO_RECOVERY; - return NULL; - } - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - if ((n < 0) || !(*name_ok)(bp)) { - h_errno = 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) { - h_errno = NO_RECOVERY; - return NULL; - } - rs->host.h_name = bp; - bp += n; - /* The qname can be abbreviated, but h_name is now absolute. */ - qname = rs->host.h_name; - } - ap = rs->host_aliases; - *ap = NULL; - rs->host.h_aliases = rs->host_aliases; - hap = rs->h_addr_ptrs; - *hap = NULL; - rs->host.h_addr_list = rs->h_addr_ptrs; - haveanswer = 0; - had_error = 0; - while (ancount-- > 0 && cp < eom && !had_error) { - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - if ((n < 0) || !(*name_ok)(bp)) { - had_error++; - continue; - } - 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; - if (class != C_IN) { - /* XXX - debug? syslog? */ - cp += n; - continue; /* XXX - had_error++ ? */ - } - if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { - if (ap >= &rs->host_aliases[MAXALIASES-1]) - continue; - n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); - if ((n < 0) || !(*name_ok)(tbuf)) { - had_error++; - continue; - } - cp += n; - if (cp != erdata) { - h_errno = NO_RECOVERY; - return NULL; - } - /* Store alias. */ - *ap++ = bp; - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - bp += n; - /* Get canonical name. */ - n = strlen(tbuf) + 1; /* for the \0 */ - if (n > ep - bp || n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - strlcpy(bp, tbuf, (size_t)(ep - bp)); - rs->host.h_name = bp; - bp += 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) { - h_errno = NO_RECOVERY; - return NULL; - } - /* Get canonical name. */ - n = strlen(tbuf) + 1; /* for the \0 */ - if (n > ep - bp || n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - strlcpy(bp, tbuf, (size_t)(ep - bp)); - tname = bp; - bp += n; - continue; - } - if (type != qtype) { - if (type != T_KEY && type != T_SIG) - syslog(LOG_NOTICE|LOG_AUTH, - "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", - qname, p_class(C_IN), p_type(qtype), - p_type(type)); - cp += n; - continue; /* XXX - had_error++ ? */ - } - switch (type) { - case T_PTR: - if (strcasecmp(tname, bp) != 0) { - syslog(LOG_NOTICE|LOG_AUTH, - AskedForGot, qname, bp); - cp += n; - continue; /* XXX - had_error++ ? */ - } - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - if ((n < 0) || !res_hnok(bp)) { - had_error++; - break; - } -#if MULTI_PTRS_ARE_ALIASES - cp += n; - if (cp != erdata) { - h_errno = NO_RECOVERY; - return NULL; - } - if (!haveanswer) - rs->host.h_name = bp; - else if (ap < &rs->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; - } - break; -#else - rs->host.h_name = bp; - if (res->options & RES_USE_INET6) { - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - had_error++; - break; - } - bp += n; - map_v4v6_hostent(&rs->host, &bp, ep); - } - h_errno = NETDB_SUCCESS; - return &rs->host; -#endif - case T_A: - case T_AAAA: - if (strcasecmp(rs->host.h_name, bp) != 0) { - syslog(LOG_NOTICE|LOG_AUTH, - AskedForGot, rs->host.h_name, bp); - cp += n; - continue; /* XXX - had_error++ ? */ - } - if (n != rs->host.h_length) { - cp += n; - continue; - } - if (type == T_AAAA) { - struct in6_addr in6; - memcpy(&in6, cp, IN6ADDRSZ); - if (IN6_IS_ADDR_V4MAPPED(&in6)) { - cp += n; - continue; - } - } - if (!haveanswer) { - int nn; - - rs->host.h_name = bp; - nn = strlen(bp) + 1; /* for the \0 */ - bp += nn; - } - - bp += sizeof(align) - - (size_t)((u_long)bp % sizeof(align)); - - if (bp + n >= &rs->hostbuf[sizeof rs->hostbuf]) { - dprintf("size (%d) too big\n", res, n); - had_error++; - continue; - } - if (hap >= &rs->h_addr_ptrs[MAXADDRS-1]) { - if (!toobig++) - dprintf("Too many addresses (%d)\n", - res, MAXADDRS); - cp += n; - continue; - } - (void)memcpy(*hap++ = bp, cp, (size_t)n); - bp += n; - cp += n; - if (cp != erdata) { - h_errno = NO_RECOVERY; - return NULL; - } - break; - default: - abort(); - } - if (!had_error) - haveanswer++; - } - if (haveanswer) { - *ap = NULL; - *hap = NULL; - /* - * Note: we sort even if host can take only one address - * in its return structures - should give it the "best" - * address in that case, not some random one - */ - if (res->nsort && haveanswer > 1 && qtype == T_A) - addrsort(rs->h_addr_ptrs, haveanswer, res); - if (!rs->host.h_name) { - n = strlen(qname) + 1; /* for the \0 */ - if (n > ep - bp || n >= MAXHOSTNAMELEN) - goto no_recovery; - strlcpy(bp, qname, (size_t)(ep - bp)); - rs->host.h_name = bp; - bp += n; - } - if (res->options & RES_USE_INET6) - map_v4v6_hostent(&rs->host, &bp, ep); - h_errno = NETDB_SUCCESS; - return &rs->host; - } - no_recovery: - h_errno = NO_RECOVERY; - return NULL; -} - -int -gethostbyname_r(const char *name, struct hostent *hp, char *buf, size_t buflen, - struct hostent**result, int *errorp) -{ - struct hostent *res; - - res = gethostbyname(name); - *errorp = h_errno; - if (res == NULL) { - *result = NULL; - return -1; - } - memcpy(hp, res, sizeof *hp); - *result = hp; - return 0; -} - -struct hostent * -gethostbyname(const char *name) -{ - struct hostent *hp; - res_state res = __res_get_state(); - - if (res == NULL) - return NULL; - - assert(name != NULL); - - /* try IPv6 first - if that fails do IPv4 */ - if (res->options & RES_USE_INET6) { - hp = gethostbyname_internal(name, AF_INET6, res, NULL, 0); - if (hp) { - __res_put_state(res); - return hp; - } - } - hp = gethostbyname_internal(name, AF_INET, res, NULL, 0); - __res_put_state(res); - return hp; -} - -struct hostent * -gethostbyname2(const char *name, int af) -{ - return android_gethostbynameforiface(name, af, NULL, 0); -} - -struct hostent * -android_gethostbynameforiface(const char *name, int af, const char *iface, int mark) -{ - struct hostent *hp; - res_state res = __res_get_state(); - - if (res == NULL) - return NULL; - hp = gethostbyname_internal(name, af, res, iface, mark); - __res_put_state(res); - return hp; -} - - -static FILE* android_open_proxy() -{ - int sock; - const int one = 1; - struct sockaddr_un proxy_addr; - - sock = socket(AF_UNIX, SOCK_STREAM, 0); - if (sock < 0) { - return NULL; - } - - setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); - memset(&proxy_addr, 0, sizeof(proxy_addr)); - proxy_addr.sun_family = AF_UNIX; - strlcpy(proxy_addr.sun_path, "/dev/socket/dnsproxyd", sizeof(proxy_addr.sun_path)); - if (TEMP_FAILURE_RETRY(connect(sock, - (const struct sockaddr*) &proxy_addr, - sizeof(proxy_addr))) != 0) { - close(sock); - return NULL; - } - - return fdopen(sock, "r+"); -} - -static struct hostent * -android_read_hostent(FILE* proxy) -{ - uint32_t size; - char buf[4]; - if (fread(buf, 1, sizeof(buf), proxy) != sizeof(buf)) return NULL; - - /* This is reading serialized data from system/netd/DnsProxyListener.cpp - * and changes here need to be matched there */ - int result_code = strtol(buf, NULL, 10); - if (result_code != DnsProxyQueryResult) { - fread(&size, 1, sizeof(size), proxy); - return NULL; - } - - if (fread(&size, 1, sizeof(size), proxy) != sizeof(size)) return NULL; - size = ntohl(size); - res_static rs = __res_get_static(); - memset(&rs->host, 0, sizeof(rs->host)); - char *ptr = rs->hostbuf; - - if (fread(ptr, 1, size, proxy) != size) return NULL; - ptr += size; - rs->host.h_name = rs->hostbuf; - - char **aliases = rs->host_aliases; - rs->host.h_aliases = rs->host_aliases; - while (1) { - if (fread(&size, 1, sizeof(size), proxy) != sizeof(size)) return NULL; - size = ntohl(size); - - if (size == 0) { - *aliases = NULL; - break; - } - if (fread(ptr, 1, size, proxy) != size) return NULL; - *aliases++ = ptr; - ptr += size; - } - - if (fread(&size, 1, sizeof(size), proxy) != sizeof(size)) return NULL; - rs->host.h_addrtype = ntohl(size); - - if (fread(&size, 1, sizeof(size), proxy) != sizeof(size)) return NULL; - rs->host.h_length = ntohl(size); - - char **addrs = rs->h_addr_ptrs; - rs->host.h_addr_list = rs->h_addr_ptrs; - while (1) { - if (fread(&size, 1, sizeof(size), proxy) != sizeof(size)) return NULL; - size = ntohl(size); - if (size == 0) { - *addrs = NULL; - break; - } - if (fread(ptr, 1, size, proxy) != size) return NULL; - *addrs++ = ptr; - ptr += size; - } - - return &rs->host; -} - - -static struct hostent * -gethostbyname_internal_real(const char *name, int af, res_state res) -{ - const char *cp; - char *bp, *ep; - int size; - struct hostent *hp; - res_static rs = __res_get_static(); - - static const ns_dtab dtab[] = { - NS_FILES_CB(_gethtbyname, NULL) - { NSSRC_DNS, _dns_gethtbyname, NULL }, /* force -DHESIOD */ - { 0, 0, 0 } - }; - - assert(name != NULL); - - switch (af) { - case AF_INET: - size = INADDRSZ; - break; - case AF_INET6: - size = IN6ADDRSZ; - break; - default: - h_errno = NETDB_INTERNAL; - errno = EAFNOSUPPORT; - return NULL; - } - - rs->host.h_addrtype = af; - rs->host.h_length = size; - - /* - * if there aren't any dots, it could be a user-level alias. - * this is also done in res_nquery() since we are not the only - * function that looks up host names. - */ - if (!strchr(name, '.') && (cp = __hostalias(name))) - name = cp; - - /* - * disallow names consisting only of digits/dots, unless - * they end in a dot. - */ - if (isdigit((u_char) name[0])) - for (cp = name;; ++cp) { - if (!*cp) { - if (*--cp == '.') - break; - /* - * All-numeric, no dot at the end. - * Fake up a hostent as if we'd actually - * done a lookup. - */ - if (inet_pton(af, name, - (char *)(void *)rs->host_addr) <= 0) { - h_errno = HOST_NOT_FOUND; - return NULL; - } - strncpy(rs->hostbuf, name, MAXDNAME); - rs->hostbuf[MAXDNAME] = '\0'; - bp = rs->hostbuf + MAXDNAME; - ep = rs->hostbuf + sizeof rs->hostbuf; - rs->host.h_name = rs->hostbuf; - rs->host.h_aliases = rs->host_aliases; - rs->host_aliases[0] = NULL; - rs->h_addr_ptrs[0] = (char *)(void *)rs->host_addr; - rs->h_addr_ptrs[1] = NULL; - rs->host.h_addr_list = rs->h_addr_ptrs; - if (res->options & RES_USE_INET6) - map_v4v6_hostent(&rs->host, &bp, ep); - h_errno = NETDB_SUCCESS; - return &rs->host; - } - if (!isdigit((u_char) *cp) && *cp != '.') - break; - } - if ((isxdigit((u_char) name[0]) && strchr(name, ':') != NULL) || - name[0] == ':') - for (cp = name;; ++cp) { - if (!*cp) { - if (*--cp == '.') - break; - /* - * All-IPv6-legal, no dot at the end. - * Fake up a hostent as if we'd actually - * done a lookup. - */ - if (inet_pton(af, name, - (char *)(void *)rs->host_addr) <= 0) { - h_errno = HOST_NOT_FOUND; - return NULL; - } - strncpy(rs->hostbuf, name, MAXDNAME); - rs->hostbuf[MAXDNAME] = '\0'; - bp = rs->hostbuf + MAXDNAME; - ep = rs->hostbuf + sizeof rs->hostbuf; - rs->host.h_name = rs->hostbuf; - rs->host.h_aliases = rs->host_aliases; - rs->host_aliases[0] = NULL; - rs->h_addr_ptrs[0] = (char *)(void *)rs->host_addr; - rs->h_addr_ptrs[1] = NULL; - rs->host.h_addr_list = rs->h_addr_ptrs; - h_errno = NETDB_SUCCESS; - return &rs->host; - } - if (!isxdigit((u_char) *cp) && *cp != ':' && *cp != '.') - break; - } - - hp = NULL; - h_errno = NETDB_INTERNAL; - if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyname", - default_dns_files, name, strlen(name), af) != NS_SUCCESS) { - return NULL; - } - h_errno = NETDB_SUCCESS; - return hp; -} - - -// very similar in proxy-ness to android_getaddrinfo_proxy -static struct hostent * -gethostbyname_internal(const char *name, int af, res_state res, const char *iface, int mark) -{ - const char *cache_mode = getenv("ANDROID_DNS_MODE"); - FILE* proxy = NULL; - struct hostent *result = NULL; - - if (cache_mode != NULL && strcmp(cache_mode, "local") == 0) { - res_setiface(res, iface); - res_setmark(res, mark); - return gethostbyname_internal_real(name, af, res); - } - - proxy = android_open_proxy(); - if (proxy == NULL) goto exit; - - /* This is writing to system/netd/DnsProxyListener.cpp and changes - * here need to be matched there */ - if (fprintf(proxy, "gethostbyname %s %s %d", - iface == NULL ? "^" : iface, - name == NULL ? "^" : name, - af) < 0) { - goto exit; - } - - if (fputc(0, proxy) == EOF || fflush(proxy) != 0) { - goto exit; - } - - result = android_read_hostent(proxy); - -exit: - if (proxy != NULL) { - fclose(proxy); - } - return result; -} - - -struct hostent * -android_gethostbyaddrforiface_proxy(const void *addr, - socklen_t len, int af, const char* iface, int mark) -{ - struct hostent *result = NULL; - FILE* proxy = android_open_proxy(); - - if (proxy == NULL) goto exit; - - char buf[INET6_ADDRSTRLEN]; //big enough for IPv4 and IPv6 - const char * addrStr = inet_ntop(af, addr, buf, sizeof(buf)); - if (addrStr == NULL) goto exit; - - if (fprintf(proxy, "gethostbyaddr %s %d %d %s", - addrStr, len, af, iface == NULL ? "^" : iface) < 0) { - goto exit; - } - - if (fputc(0, proxy) == EOF || fflush(proxy) != 0) { - goto exit; - } - - result = android_read_hostent(proxy); -exit: - if (proxy != NULL) { - fclose(proxy); - } - return result; -} - -struct hostent * -android_gethostbyaddrforiface_real(const void *addr, - socklen_t len, int af, const char* iface, int mark) -{ - const u_char *uaddr = (const u_char *)addr; - socklen_t size; - struct hostent *hp; - static const ns_dtab dtab[] = { - NS_FILES_CB(_gethtbyaddr, NULL) - { NSSRC_DNS, _dns_gethtbyaddr, NULL }, /* force -DHESIOD */ - { 0, 0, 0 } - }; - - assert(addr != NULL); - - if (af == AF_INET6 && len == IN6ADDRSZ && - (IN6_IS_ADDR_LINKLOCAL((const struct in6_addr *)(const void *)uaddr) || - IN6_IS_ADDR_SITELOCAL((const struct in6_addr *)(const void *)uaddr))) { - h_errno = HOST_NOT_FOUND; - return NULL; - } - if (af == AF_INET6 && len == IN6ADDRSZ && - (IN6_IS_ADDR_V4MAPPED((const struct in6_addr *)(const void *)uaddr) || - IN6_IS_ADDR_V4COMPAT((const struct in6_addr *)(const void *)uaddr))) { - /* Unmap. */ - addr += IN6ADDRSZ - INADDRSZ; - uaddr += IN6ADDRSZ - INADDRSZ; - 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; - } - if (size != len) { - errno = EINVAL; - h_errno = NETDB_INTERNAL; - return NULL; - } - hp = NULL; - h_errno = NETDB_INTERNAL; - if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyaddr", - default_dns_files, uaddr, len, af, iface, mark) != NS_SUCCESS) - return NULL; - h_errno = NETDB_SUCCESS; - return hp; -} - -struct hostent * -android_gethostbyaddrforiface(const void *addr, socklen_t len, int af, const char* iface, int mark) -{ - const char *cache_mode = getenv("ANDROID_DNS_MODE"); - - if (cache_mode == NULL || strcmp(cache_mode, "local") != 0) { - return android_gethostbyaddrforiface_proxy(addr, len, af, iface, mark); - } else { - return android_gethostbyaddrforiface_real(addr,len, af, iface, mark); - } -} - -struct hostent * -gethostbyaddr(const void *addr, socklen_t len, int af) -{ - return android_gethostbyaddrforiface(addr, len, af, NULL, 0); -} - - -static void -_sethtent(int f) -{ - res_static rs = __res_get_static(); - if (rs == NULL) return; - if (!rs->hostf) - rs->hostf = fopen(_PATH_HOSTS, "r" ); - else - rewind(rs->hostf); - rs->stayopen = f; -} - -static void -_endhtent(void) -{ - res_static rs = __res_get_static(); - if (rs == NULL) return; - - if (rs->hostf && !rs->stayopen) { - (void) fclose(rs->hostf); - rs->hostf = NULL; - } -} - -static struct hostent * -_gethtent(void) -{ - char *p; - char *cp, **q; - int af, len; - res_static rs = __res_get_static(); - - if (!rs->hostf && !(rs->hostf = fopen(_PATH_HOSTS, "r" ))) { - h_errno = NETDB_INTERNAL; - return NULL; - } - again: - if (!(p = fgets(rs->hostbuf, sizeof rs->hostbuf, rs->hostf))) { - h_errno = HOST_NOT_FOUND; - return NULL; - } - if (*p == '#') - goto again; - if (!(cp = strpbrk(p, "#\n"))) - goto again; - *cp = '\0'; - if (!(cp = strpbrk(p, " \t"))) - goto again; - *cp++ = '\0'; - if (inet_pton(AF_INET6, p, (char *)(void *)rs->host_addr) > 0) { - af = AF_INET6; - len = IN6ADDRSZ; - } else if (inet_pton(AF_INET, p, (char *)(void *)rs->host_addr) > 0) { - res_state res = __res_get_state(); - if (res == NULL) - return NULL; - if (res->options & RES_USE_INET6) { - map_v4v6_address((char *)(void *)rs->host_addr, - (char *)(void *)rs->host_addr); - af = AF_INET6; - len = IN6ADDRSZ; - } else { - af = AF_INET; - len = INADDRSZ; - } - __res_put_state(res); - } else { - goto again; - } - /* if this is not something we're looking for, skip it. */ - if (rs->host.h_addrtype != 0 && rs->host.h_addrtype != af) - goto again; - if (rs->host.h_length != 0 && rs->host.h_length != len) - goto again; - rs->h_addr_ptrs[0] = (char *)(void *)rs->host_addr; - rs->h_addr_ptrs[1] = NULL; - rs->host.h_addr_list = rs->h_addr_ptrs; - rs->host.h_length = len; - rs->host.h_addrtype = af; - while (*cp == ' ' || *cp == '\t') - cp++; - rs->host.h_name = cp; - q = rs->host.h_aliases = rs->host_aliases; - if ((cp = strpbrk(cp, " \t")) != NULL) - *cp++ = '\0'; - while (cp && *cp) { - if (*cp == ' ' || *cp == '\t') { - cp++; - continue; - } - if (q < &rs->host_aliases[MAXALIASES - 1]) - *q++ = cp; - if ((cp = strpbrk(cp, " \t")) != NULL) - *cp++ = '\0'; - } - *q = NULL; - h_errno = NETDB_SUCCESS; - return &rs->host; -} - -/*ARGSUSED*/ -int -_gethtbyname(void *rv, void *cb_data, va_list ap) -{ - struct hostent *hp; - const char *name; - int af; - - assert(rv != NULL); - - name = va_arg(ap, char *); - /* NOSTRICT skip len */(void)va_arg(ap, int); - af = va_arg(ap, int); - - hp = NULL; -#if 0 - { - res_state res = __res_get_state(); - if (res == NULL) - return NS_NOTFOUND; - if (res->options & RES_USE_INET6) - hp = _gethtbyname2(name, AF_INET6); - if (hp==NULL) - hp = _gethtbyname2(name, AF_INET); - __res_put_state(res); - } -#else - hp = _gethtbyname2(name, af); -#endif - *((struct hostent **)rv) = hp; - if (hp == NULL) { - h_errno = HOST_NOT_FOUND; - return NS_NOTFOUND; - } - return NS_SUCCESS; -} - -static struct hostent * -_gethtbyname2(const char *name, int af) -{ - struct hostent *p; - char *tmpbuf, *ptr, **cp; - int num; - size_t len; - res_static rs = __res_get_static(); - - assert(name != NULL); - - _sethtent(rs->stayopen); - ptr = tmpbuf = NULL; - num = 0; - while ((p = _gethtent()) != NULL && num < MAXADDRS) { - if (p->h_addrtype != af) - continue; - if (strcasecmp(p->h_name, name) != 0) { - for (cp = p->h_aliases; *cp != NULL; cp++) - if (strcasecmp(*cp, name) == 0) - break; - if (*cp == NULL) continue; - } - - if (num == 0) { - size_t bufsize; - char *src; - - bufsize = strlen(p->h_name) + 2 + - MAXADDRS * p->h_length + - ALIGNBYTES; - for (cp = p->h_aliases; *cp != NULL; cp++) - bufsize += strlen(*cp) + 1; - - if ((tmpbuf = malloc(bufsize)) == NULL) { - h_errno = NETDB_INTERNAL; - return NULL; - } - - ptr = tmpbuf; - src = p->h_name; - while ((*ptr++ = *src++) != '\0'); - for (cp = p->h_aliases; *cp != NULL; cp++) { - src = *cp; - while ((*ptr++ = *src++) != '\0'); - } - *ptr++ = '\0'; - - ptr = (char *)(void *)ALIGN(ptr); - } - - (void)memcpy(ptr, p->h_addr_list[0], (size_t)p->h_length); - ptr += p->h_length; - num++; - } - _endhtent(); - if (num == 0) return NULL; - - len = ptr - tmpbuf; - if (len > (sizeof(rs->hostbuf) - ALIGNBYTES)) { - free(tmpbuf); - errno = ENOSPC; - h_errno = NETDB_INTERNAL; - return NULL; - } - ptr = memcpy((void *)ALIGN(rs->hostbuf), tmpbuf, len); - free(tmpbuf); - - rs->host.h_name = ptr; - while (*ptr++); - - cp = rs->host_aliases; - while (*ptr) { - *cp++ = ptr; - while (*ptr++); - } - ptr++; - *cp = NULL; - - ptr = (char *)(void *)ALIGN(ptr); - cp = rs->h_addr_ptrs; - while (num--) { - *cp++ = ptr; - ptr += rs->host.h_length; - } - *cp = NULL; - - return &rs->host; -} - -/*ARGSUSED*/ -static int -_gethtbyaddr(void *rv, void *cb_data, va_list ap) -{ - struct hostent *p; - const unsigned char *addr; - int len, af; - res_static rs = __res_get_static(); - - assert(rv != NULL); - - addr = va_arg(ap, unsigned char *); - len = va_arg(ap, int); - af = va_arg(ap, int); - - rs->host.h_length = len; - rs->host.h_addrtype = af; - - _sethtent(rs->stayopen); - while ((p = _gethtent()) != NULL) - if (p->h_addrtype == af && !memcmp(p->h_addr, addr, - (size_t)len)) - break; - _endhtent(); - *((struct hostent **)rv) = p; - if (p==NULL) { - h_errno = HOST_NOT_FOUND; - return NS_NOTFOUND; - } - return NS_SUCCESS; -} - -static void -map_v4v6_address(const char *src, char *dst) -{ - u_char *p = (u_char *)dst; - char tmp[INADDRSZ]; - int i; - - assert(src != NULL); - assert(dst != NULL); - - /* Stash a temporary copy so our caller can update in place. */ - (void)memcpy(tmp, src, 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. */ - (void)memcpy((void *)p, tmp, INADDRSZ); -} - -static void -map_v4v6_hostent(struct hostent *hp, char **bpp, char *ep) -{ - char **ap; - - assert(hp != NULL); - assert(bpp != NULL); - assert(ep != NULL); - - 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) - (size_t)((u_long)*bpp % sizeof(align)); - - if (ep - *bpp < (i + IN6ADDRSZ)) { - /* Out of memory. Truncate address list here. XXX */ - *ap = NULL; - return; - } - *bpp += i; - map_v4v6_address(*ap, *bpp); - *ap = *bpp; - *bpp += IN6ADDRSZ; - } -} - -static void -addrsort(char **ap, int num, res_state res) -{ - int i, j; - char **p; - short aval[MAXADDRS]; - int needsort = 0; - - assert(ap != NULL); - - 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 == - (((struct in_addr *)(void *)(*p))->s_addr & - res->sort_list[j].mask)) - break; - aval[i] = j; - if (needsort == 0 && i > 0 && j < aval[i-1]) - needsort = i; - } - if (!needsort) - return; - - while (needsort < num) { - for (j = needsort - 1; j >= 0; j--) { - if (aval[j] > aval[j+1]) { - char *hp; - - i = aval[j]; - aval[j] = aval[j+1]; - aval[j+1] = i; - - hp = ap[j]; - ap[j] = ap[j+1]; - ap[j+1] = hp; - } else - break; - } - needsort++; - } -} - -struct hostent * -gethostent(void) -{ - res_static rs = __res_get_static(); - rs->host.h_addrtype = 0; - rs->host.h_length = 0; - return _gethtent(); -} - -/*ARGSUSED*/ -static int -_dns_gethtbyname(void *rv, void *cb_data, va_list ap) -{ - querybuf *buf; - int n, type; - struct hostent *hp; - const char *name; - int af; - res_state res; - - assert(rv != NULL); - - name = va_arg(ap, char *); - /* NOSTRICT skip len */(void)va_arg(ap, int); - af = va_arg(ap, int); - - switch (af) { - case AF_INET: - type = T_A; - break; - case AF_INET6: - type = T_AAAA; - break; - default: - return NS_UNAVAIL; - } - buf = malloc(sizeof(*buf)); - if (buf == NULL) { - h_errno = NETDB_INTERNAL; - return NS_NOTFOUND; - } - res = __res_get_state(); - if (res == NULL) { - free(buf); - return NS_NOTFOUND; - } - n = res_nsearch(res, name, C_IN, type, buf->buf, sizeof(buf->buf)); - if (n < 0) { - free(buf); - dprintf("res_nsearch failed (%d)\n", res, n); - __res_put_state(res); - return NS_NOTFOUND; - } - hp = getanswer(buf, n, name, type, res); - free(buf); - __res_put_state(res); - if (hp == NULL) - switch (h_errno) { - case HOST_NOT_FOUND: - return NS_NOTFOUND; - case TRY_AGAIN: - return NS_TRYAGAIN; - default: - return NS_UNAVAIL; - } - *((struct hostent **)rv) = hp; - return NS_SUCCESS; -} - -/*ARGSUSED*/ -static int -_dns_gethtbyaddr(void *rv, void *cb_data, va_list ap) -{ - char qbuf[MAXDNAME + 1], *qp, *ep; - int n; - querybuf *buf; - struct hostent *hp; - const unsigned char *uaddr; - int len, af, advance; - res_state res; - const char* iface; - int mark; - res_static rs = __res_get_static(); - - assert(rv != NULL); - - uaddr = va_arg(ap, unsigned char *); - len = va_arg(ap, int); - af = va_arg(ap, int); - iface = va_arg(ap, char *); - mark = va_arg(ap, int); - - switch (af) { - case AF_INET: - (void)snprintf(qbuf, sizeof(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; - ep = qbuf + sizeof(qbuf) - 1; - for (n = IN6ADDRSZ - 1; n >= 0; n--) { - advance = snprintf(qp, (size_t)(ep - qp), "%x.%x.", - uaddr[n] & 0xf, - ((unsigned int)uaddr[n] >> 4) & 0xf); - if (advance > 0 && qp + advance < ep) - qp += advance; - else { - h_errno = NETDB_INTERNAL; - return NS_NOTFOUND; - } - } - if (strlcat(qbuf, "ip6.arpa", sizeof(qbuf)) >= sizeof(qbuf)) { - h_errno = NETDB_INTERNAL; - return NS_NOTFOUND; - } - break; - default: - abort(); - } - - buf = malloc(sizeof(*buf)); - if (buf == NULL) { - h_errno = NETDB_INTERNAL; - return NS_NOTFOUND; - } - res = __res_get_state(); - if (res == NULL) { - free(buf); - return NS_NOTFOUND; - } - res_setiface(res, iface); - res_setmark(res, mark); - n = res_nquery(res, qbuf, C_IN, T_PTR, buf->buf, sizeof(buf->buf)); - if (n < 0) { - free(buf); - dprintf("res_nquery failed (%d)\n", res, n); - __res_put_state(res); - return NS_NOTFOUND; - } - hp = getanswer(buf, n, qbuf, T_PTR, res); - free(buf); - if (hp == NULL) { - __res_put_state(res); - switch (h_errno) { - case HOST_NOT_FOUND: - return NS_NOTFOUND; - case TRY_AGAIN: - return NS_TRYAGAIN; - default: - return NS_UNAVAIL; - } - } - hp->h_addrtype = af; - hp->h_length = len; - (void)memcpy(rs->host_addr, uaddr, (size_t)len); - rs->h_addr_ptrs[0] = (char *)(void *)rs->host_addr; - rs->h_addr_ptrs[1] = NULL; - if (af == AF_INET && (res->options & RES_USE_INET6)) { - map_v4v6_address((char *)(void *)rs->host_addr, - (char *)(void *)rs->host_addr); - hp->h_addrtype = AF_INET6; - hp->h_length = IN6ADDRSZ; - } - - __res_put_state(res); - *((struct hostent **)rv) = hp; - h_errno = NETDB_SUCCESS; - return NS_SUCCESS; -} |