/*
* 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.
*/
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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.
*/
/* from gethostnamadr.c 8.1 (Berkeley) 6/4/93 */
/* BIND Id: gethnamaddr.c,v 8.15 1996/05/22 04:56:30 vixie Exp $ */
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: lcl_ho.c,v 1.5 2006/03/09 23:57:56 marka Exp $";
#endif /* LIBC_SCCS and not lint */
/* Imports. */
#include "port_before.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <irs.h>
#include <isc/memcluster.h>
#include "port_after.h"
#include "irs_p.h"
#include "dns_p.h"
#include "lcl_p.h"
#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) sprintf x
#endif
/* Definitions. */
#define MAXALIASES 35
#define MAXADDRS 35
#define Max(a,b) ((a) > (b) ? (a) : (b))
#if PACKETSZ > 1024
#define MAXPACKET PACKETSZ
#else
#define MAXPACKET 1024
#endif
struct pvt {
FILE * fp;
struct hostent host;
char * h_addr_ptrs[MAXADDRS + 1];
char * host_aliases[MAXALIASES];
char hostbuf[8*1024];
u_char host_addr[16]; /*%< IPv4 or IPv6 */
struct __res_state *res;
void (*free_res)(void *);
};
typedef union {
int32_t al;
char ac;
} align;
static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
/* Forward. */
static void ho_close(struct irs_ho *this);
static struct hostent * ho_byname(struct irs_ho *this, const char *name);
static struct hostent * ho_byname2(struct irs_ho *this, const char *name,
int af);
static struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
int len, int af);
static struct hostent * ho_next(struct irs_ho *this);
static void ho_rewind(struct irs_ho *this);
static void ho_minimize(struct irs_ho *this);
static struct __res_state * ho_res_get(struct irs_ho *this);
static void ho_res_set(struct irs_ho *this,
struct __res_state *res,
void (*free_res)(void *));
static struct addrinfo * ho_addrinfo(struct irs_ho *this, const char *name,
const struct addrinfo *pai);
static size_t ns_namelen(const char *);
static int init(struct irs_ho *this);
/* Portability. */
#ifndef SEEK_SET
# define SEEK_SET 0
#endif
/* Public. */
struct irs_ho *
irs_lcl_ho(struct irs_acc *this) {
struct irs_ho *ho;
struct pvt *pvt;
UNUSED(this);
if (!(pvt = memget(sizeof *pvt))) {
errno = ENOMEM;
return (NULL);
}
memset(pvt, 0, sizeof *pvt);
if (!(ho = memget(sizeof *ho))) {
memput(pvt, sizeof *pvt);
errno = ENOMEM;
return (NULL);
}
memset(ho, 0x5e, sizeof *ho);
ho->private = pvt;
ho->close = ho_close;
ho->byname = ho_byname;
ho->byname2 = ho_byname2;
ho->byaddr = ho_byaddr;
ho->next = ho_next;
ho->rewind = ho_rewind;
ho->minimize = ho_minimize;
ho->res_get = ho_res_get;
ho->res_set = ho_res_set;
ho->addrinfo = ho_addrinfo;
return (ho);
}
/* Methods. */
static void
ho_close(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
ho_minimize(this);
if (pvt->fp)
(void) fclose(pvt->fp);
if (pvt->res && pvt->free_res)
(*pvt->free_res)(pvt->res);
memput(pvt, sizeof *pvt);
memput(this, sizeof *this);
}
static struct hostent *
ho_byname(struct irs_ho *this, const char *name) {
struct pvt *pvt = (struct pvt *)this->private;
struct hostent *hp;
if (init(this) == -1)
return (NULL);
if (pvt->res->options & RES_USE_INET6) {
hp = ho_byname2(this, name, AF_INET6);
if (hp)
return (hp);
}
return (ho_byname2(this, name, AF_INET));
}
static struct hostent *
ho_byname2(struct irs_ho *this, const char *name, int af) {
struct pvt *pvt = (struct pvt *)this->private;
struct hostent *hp;
char **hap;
size_t n;
if (init(this) == -1)
return (NULL);
ho_rewind(this);
n = ns_namelen(name);
while ((hp = ho_next(this)) != NULL) {
size_t nn;
if (hp->h_addrtype != af)
continue;
nn = ns_namelen(hp->h_name);
if (strncasecmp(hp->h_name, name, Max(n, nn)) == 0)
goto found;
for (hap = hp->h_aliases; *hap; hap++) {
nn = ns_namelen(*hap);
if (strncasecmp(*hap, name, Max(n, nn)) == 0)
goto found;
}
}
found:
if (!hp) {
RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
return (NULL);
}
RES_SET_H_ERRNO(pvt->res, NETDB_SUCCESS);
return (hp);
}
static struct hostent *
ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
struct pvt *pvt = (struct pvt *)this->private;
const u_char *uaddr = addr;
struct hostent *hp;
int size;
if (init(this) == -1)
return (NULL);
if (af == AF_INET6 && len == IN6ADDRSZ &&
(!memcmp(uaddr, mapped, sizeof mapped) ||
!memcmp(uaddr, tunnelled, sizeof tunnelled))) {
/* Unmap. */
addr = (const u_char *)addr + sizeof mapped;
uaddr += sizeof mapped;
af = AF_INET;
len = INADDRSZ;
}
switch (af) {
case AF_INET:
size = INADDRSZ;
break;
case AF_INET6:
size = IN6ADDRSZ;
break;
default:
errno = EAFNOSUPPORT;
RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
return (NULL);
}
if (size > len) {
errno = EINVAL;
RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
return (NULL);
}
/*
* Do the search.
*/
ho_rewind(this);
while ((hp = ho_next(this)) != NULL) {
char **hap;
for (hap = hp->h_addr_list; *hap; hap++) {
const u_char *taddr = (const u_char *)*hap;
int taf = hp->h_addrtype;
int tlen = hp->h_length;
if (taf == AF_INET6 && tlen == IN6ADDRSZ &&
(!memcmp(taddr, mapped, sizeof mapped) ||
!memcmp(taddr, tunnelled, sizeof tunnelled))) {
/* Unmap. */
taddr += sizeof mapped;
taf = AF_INET;
tlen = INADDRSZ;
}
if (taf == af && tlen == len &&
!memcmp(taddr, uaddr, tlen))
goto found;
}
}
found:
if (!hp) {
RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
return (NULL);
}
RES_SET_H_ERRNO(pvt->res, NETDB_SUCCESS);
return (hp);
}
static struct hostent *
ho_next(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
char *cp, **q, *p;
char *bufp, *ndbuf, *dbuf = NULL;
int c, af, len, bufsiz, offset;
if (init(this) == -1)
return (NULL);
if (!pvt->fp)
ho_rewind(this);
if (!pvt->fp) {
RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
return (NULL);
}
bufp = pvt->hostbuf;
bufsiz = sizeof pvt->hostbuf;
offset = 0;
again:
if (!(p = fgets(bufp + offset, bufsiz - offset, pvt->fp))) {
RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
if (dbuf)
free(dbuf);
return (NULL);
}
if (!strchr(p, '\n') && !feof(pvt->fp)) {
#define GROWBUF 1024
/* allocate space for longer line */
if (dbuf == NULL) {
if ((ndbuf = malloc(bufsiz + GROWBUF)) != NULL)
strcpy(ndbuf, bufp);
} else
ndbuf = realloc(dbuf, bufsiz + GROWBUF);
if (ndbuf) {
dbuf = ndbuf;
bufp = dbuf;
bufsiz += GROWBUF;
offset = strlen(dbuf);
} else {
/* allocation failed; skip this long line */
while ((c = getc(pvt->fp)) != EOF)
if (c == '\n')
break;
if (c != EOF)
ungetc(c, pvt->fp);
}
goto again;
}
p -= offset;
offset = 0;
if (*p == '#')
goto again;
if ((cp = strpbrk(p, "#\n")) != NULL)
*cp = '\0';
if (!(cp = strpbrk(p, " \t")))
goto again;
*cp++ = '\0';
if (inet_pton(AF_INET6, p, pvt->host_addr) > 0) {
af = AF_INET6;
len = IN6ADDRSZ;
} else if (inet_aton(p, (struct in_addr *)pvt->host_addr) > 0) {
if (pvt->res->options & RES_USE_INET6) {
map_v4v6_address((char*)pvt->host_addr,
(char*)pvt->host_addr);
af = AF_INET6;
len = IN6ADDRSZ;
} else {
af = AF_INET;
len = INADDRSZ;
}
} else {
goto again;
}
pvt->h_addr_ptrs[0] = (char *)pvt->host_addr;
pvt->h_addr_ptrs[1] = NULL;
pvt->host.h_addr_list = pvt->h_addr_ptrs;
pvt->host.h_length = len;
pvt->host.h_addrtype = af;
while (*cp == ' ' || *cp == '\t')
cp++;
pvt->host.h_name = cp;
q = pvt->host.h_aliases = pvt->host_aliases;
if ((cp = strpbrk(cp, " \t")) != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &pvt->host_aliases[MAXALIASES - 1])
*q++ = cp;
if ((cp = strpbrk(cp, " \t")) != NULL)
*cp++ = '\0';
}
*q = NULL;
if (dbuf)
free(dbuf);
RES_SET_H_ERRNO(pvt->res, NETDB_SUCCESS);
return (&pvt->host);
}
static void
ho_rewind(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->fp) {
if (fseek(pvt->fp, 0L, SEEK_SET) == 0)
return;
(void)fclose(pvt->fp);
}
if (!(pvt->fp = fopen(_PATH_HOSTS, "r")))
return;
if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
(void)fclose(pvt->fp);
pvt->fp = NULL;
}
}
static void
ho_minimize(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->fp != NULL) {
(void)fclose(pvt->fp);
pvt->fp = NULL;
}
if (pvt->res)
res_nclose(pvt->res);
}
static struct __res_state *
ho_res_get(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (!pvt->res) {
struct __res_state *res;
res = (struct __res_state *)malloc(sizeof *res);
if (!res) {
errno = ENOMEM;
return (NULL);
}
memset(res, 0, sizeof *res);
ho_res_set(this, res, free);
}
return (pvt->res);
}
static void
ho_res_set(struct irs_ho *this, struct __res_state *res,
void (*free_res)(void *)) {
struct pvt *pvt = (struct pvt *)this->private;
if (pvt->res && pvt->free_res) {
res_nclose(pvt->res);
(*pvt->free_res)(pvt->res);
}
pvt->res = res;
pvt->free_res = free_res;
}
struct lcl_res_target {
struct lcl_res_target *next;
int family;
};
/* XXX */
extern struct addrinfo *hostent2addrinfo __P((struct hostent *,
const struct addrinfo *pai));
static struct addrinfo *
ho_addrinfo(struct irs_ho *this, const char *name, const struct addrinfo *pai)
{
struct pvt *pvt = (struct pvt *)this->private;
struct hostent *hp;
struct lcl_res_target q, q2, *p;
struct addrinfo sentinel, *cur;
memset(&q, 0, sizeof(q2));
memset(&q2, 0, sizeof(q2));
memset(&sentinel, 0, sizeof(sentinel));
cur = &sentinel;
switch(pai->ai_family) {
case AF_UNSPEC: /*%< INET6 then INET4 */
q.family = AF_INET6;
q.next = &q2;
q2.family = AF_INET;
break;
case AF_INET6:
q.family = AF_INET6;
break;
case AF_INET:
q.family = AF_INET;
break;
default:
RES_SET_H_ERRNO(pvt->res, NO_RECOVERY); /*%< ??? */
return(NULL);
}
for (p = &q; p; p = p->next) {
struct addrinfo *ai;
hp = (*this->byname2)(this, name, p->family);
if (hp == NULL) {
/* byname2 should've set an appropriate error */
continue;
}
if ((hp->h_name == NULL) || (hp->h_name[0] == 0) ||
(hp->h_addr_list[0] == NULL)) {
RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
continue;
}
ai = hostent2addrinfo(hp, pai);
if (ai) {
cur->ai_next = ai;
while (cur->ai_next)
cur = cur->ai_next;
}
}
if (sentinel.ai_next == NULL)
RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
return(sentinel.ai_next);
}
/* Private. */
static size_t
ns_namelen(const char *s) {
int i;
for (i = strlen(s); i > 0 && s[i-1] == '.'; i--)
(void)NULL;
return ((size_t) i);
}
static int
init(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
if (!pvt->res && !ho_res_get(this))
return (-1);
if (((pvt->res->options & RES_INIT) == 0U) &&
res_ninit(pvt->res) == -1)
return (-1);
return (0);
}
/*! \file */