freebsd-dev/contrib/bind/lib/irs/nis_ho.c
2002-02-04 19:12:46 +00:00

464 lines
11 KiB
C

/*
* 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: nis_ho.c,v 1.18 2001/06/18 14:44:00 marka Exp $";
#endif /* LIBC_SCCS and not lint */
/* Imports */
#include "port_before.h"
#ifndef WANT_IRS_NIS
static int __bind_irs_nis_unneeded;
#else
#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 <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include <isc/memcluster.h>
#include <irs.h>
#include "port_after.h"
#include "irs_p.h"
#include "nis_p.h"
/* Definitions */
#define MAXALIASES 35
#define MAXADDRS 35
#if PACKETSZ > 1024
#define MAXPACKET PACKETSZ
#else
#define MAXPACKET 1024
#endif
struct pvt {
int needrewind;
char * nis_domain;
char * curkey_data;
int curkey_len;
char * curval_data;
int curval_len;
struct hostent host;
char * h_addr_ptrs[MAXADDRS + 1];
char * host_aliases[MAXALIASES + 1];
char hostbuf[8*1024];
u_char host_addr[16]; /* IPv4 or IPv6 */
struct __res_state *res;
void (*free_res)(void *);
};
enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 };
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 };
static /*const*/ char hosts_byname[] = "hosts.byname";
static /*const*/ char hosts_byaddr[] = "hosts.byaddr";
/* Forwards */
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 struct hostent * makehostent(struct irs_ho *this);
static void nisfree(struct pvt *, enum do_what);
static int init(struct irs_ho *this);
/* Public */
struct irs_ho *
irs_nis_ho(struct irs_acc *this) {
struct irs_ho *ho;
struct pvt *pvt;
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);
pvt->needrewind = 1;
pvt->nis_domain = ((struct nis_p *)this->private)->domain;
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_set = ho_res_set;
ho->res_get = ho_res_get;
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);
nisfree(pvt, do_all);
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;
int r;
char *tmp;
UNUSED(af);
if (init(this) == -1)
return (NULL);
nisfree(pvt, do_val);
DE_CONST(name, tmp);
r = yp_match(pvt->nis_domain, hosts_byname, tmp,
strlen(tmp), &pvt->curval_data, &pvt->curval_len);
if (r != 0) {
RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
return (NULL);
}
return (makehostent(this));
}
static struct hostent *
ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
struct pvt *pvt = (struct pvt *)this->private;
char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
const u_char *uaddr = addr;
int r;
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;
}
if (inet_ntop(af, uaddr, tmp, sizeof tmp) == NULL) {
RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
return (NULL);
}
nisfree(pvt, do_val);
r = yp_match(pvt->nis_domain, hosts_byaddr, tmp, strlen(tmp),
&pvt->curval_data, &pvt->curval_len);
if (r != 0) {
RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
return (NULL);
}
return (makehostent(this));
}
static struct hostent *
ho_next(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
struct hostent *rval;
int r;
if (init(this) == -1)
return (NULL);
do {
if (pvt->needrewind) {
nisfree(pvt, do_all);
r = yp_first(pvt->nis_domain, hosts_byaddr,
&pvt->curkey_data, &pvt->curkey_len,
&pvt->curval_data, &pvt->curval_len);
pvt->needrewind = 0;
} else {
char *newkey_data;
int newkey_len;
nisfree(pvt, do_val);
r = yp_next(pvt->nis_domain, hosts_byaddr,
pvt->curkey_data, pvt->curkey_len,
&newkey_data, &newkey_len,
&pvt->curval_data, &pvt->curval_len);
nisfree(pvt, do_key);
pvt->curkey_data = newkey_data;
pvt->curkey_len = newkey_len;
}
if (r != 0) {
RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
return (NULL);
}
rval = makehostent(this);
} while (rval == NULL);
return (rval);
}
static void
ho_rewind(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
pvt->needrewind = 1;
}
static void
ho_minimize(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
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 nis_res_target {
struct nis_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 nis_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 && 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 struct hostent *
makehostent(struct irs_ho *this) {
struct pvt *pvt = (struct pvt *)this->private;
static const char spaces[] = " \t";
char *cp, **q, *p;
int af, len;
p = pvt->curval_data;
if ((cp = strpbrk(p, "#\n")) != NULL)
*cp = '\0';
if (!(cp = strpbrk(p, spaces)))
return (NULL);
*cp++ = '\0';
if ((pvt->res->options & RES_USE_INET6) &&
inet_pton(AF_INET6, p, pvt->host_addr) > 0) {
af = AF_INET6;
len = IN6ADDRSZ;
} else if (inet_pton(AF_INET, p, 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 {
return (NULL);
}
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;
cp += strspn(cp, spaces);
pvt->host.h_name = cp;
q = pvt->host.h_aliases = pvt->host_aliases;
if ((cp = strpbrk(cp, spaces)) != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &pvt->host_aliases[MAXALIASES])
*q++ = cp;
if ((cp = strpbrk(cp, spaces)) != NULL)
*cp++ = '\0';
}
*q = NULL;
RES_SET_H_ERRNO(pvt->res, NETDB_SUCCESS);
return (&pvt->host);
}
static void
nisfree(struct pvt *pvt, enum do_what do_what) {
if ((do_what & do_key) && pvt->curkey_data) {
free(pvt->curkey_data);
pvt->curkey_data = NULL;
}
if ((do_what & do_val) && pvt->curval_data) {
free(pvt->curval_data);
pvt->curval_data = NULL;
}
}
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) == 0) &&
res_ninit(pvt->res) == -1)
return (-1);
return (0);
}
#endif /*WANT_IRS_NIS*/