/*      $NetBSD: dns_pw.c,v 1.1.1.2 2012/09/09 16:07:57 christos Exp $  */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* 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.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: dns_pw.c,v 1.3 2005/04/27 04:56:22 sra Exp ";
#endif

#include "port_before.h"

#ifndef WANT_IRS_PW
static int __bind_irs_pw_unneeded;
#else

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>

#include <isc/memcluster.h>

#include <irs.h>

#include "port_after.h"

#include "irs_p.h"
#include "hesiod.h"
#include "dns_p.h"

/* Types. */

struct pvt {
       struct dns_p *  dns;
       struct passwd   passwd;
       char *          pwbuf;
};

/* Forward. */

static void                     pw_close(struct irs_pw *);
static struct passwd *          pw_byname(struct irs_pw *, const char *);
static struct passwd *          pw_byuid(struct irs_pw *, uid_t);
static struct passwd *          pw_next(struct irs_pw *);
static void                     pw_rewind(struct irs_pw *);
static void                     pw_minimize(struct irs_pw *);
static struct __res_state *     pw_res_get(struct irs_pw *);
static void                     pw_res_set(struct irs_pw *,
                                          struct __res_state *,
                                          void (*)(void *));

static struct passwd *          getpwcommon(struct irs_pw *, const char *,
                                           const char *);

/* Public. */

struct irs_pw *
irs_dns_pw(struct irs_acc *this) {
       struct dns_p *dns = (struct dns_p *)this->private;
       struct irs_pw *pw;
       struct pvt *pvt;

       if (!dns || !dns->hes_ctx) {
               errno = ENODEV;
               return (NULL);
       }
       if (!(pvt = memget(sizeof *pvt))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       pvt->dns = dns;
       if (!(pw = memget(sizeof *pw))) {
               memput(pvt, sizeof *pvt);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pw, 0x5e, sizeof *pw);
       pw->private = pvt;
       pw->close = pw_close;
       pw->byname = pw_byname;
       pw->byuid = pw_byuid;
       pw->next = pw_next;
       pw->rewind = pw_rewind;
       pw->minimize = pw_minimize;
       pw->res_get = pw_res_get;
       pw->res_set = pw_res_set;
       return (pw);
}

/* Methods. */

static void
pw_close(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (pvt->pwbuf)
               free(pvt->pwbuf);

       memput(pvt, sizeof *pvt);
       memput(this, sizeof *this);
}

static struct passwd *
pw_byname(struct irs_pw *this, const char *nam) {
       return (getpwcommon(this, nam, "passwd"));
}

static struct passwd *
pw_byuid(struct irs_pw *this, uid_t uid) {
       char uidstr[16];

       sprintf(uidstr, "%lu", (u_long)uid);
       return (getpwcommon(this, uidstr, "uid"));
}

static struct passwd *
pw_next(struct irs_pw *this) {
       UNUSED(this);
       errno = ENODEV;
       return (NULL);
}

static void
pw_rewind(struct irs_pw *this) {
       UNUSED(this);
       /* NOOP */
}

static void
pw_minimize(struct irs_pw *this) {
       UNUSED(this);
       /* NOOP */
}

static struct __res_state *
pw_res_get(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct dns_p *dns = pvt->dns;

       return (__hesiod_res_get(dns->hes_ctx));
}

static void
pw_res_set(struct irs_pw *this, struct __res_state * res,
          void (*free_res)(void *)) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct dns_p *dns = pvt->dns;

       __hesiod_res_set(dns->hes_ctx, res, free_res);
}

/* Private. */

static struct passwd *
getpwcommon(struct irs_pw *this, const char *arg, const char *type) {
       struct pvt *pvt = (struct pvt *)this->private;
       char **hes_list, *cp;

       if (!(hes_list = hesiod_resolve(pvt->dns->hes_ctx, arg, type)))
               return (NULL);
       if (!*hes_list) {
               hesiod_free_list(pvt->dns->hes_ctx, hes_list);
               errno = ENOENT;
               return (NULL);
       }

       memset(&pvt->passwd, 0, sizeof pvt->passwd);
       if (pvt->pwbuf)
               free(pvt->pwbuf);
       pvt->pwbuf = strdup(*hes_list);
       hesiod_free_list(pvt->dns->hes_ctx, hes_list);

       cp = pvt->pwbuf;
       pvt->passwd.pw_name = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_passwd = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_uid = atoi(cp);
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_gid = atoi(cp);
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_gecos = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_dir = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_shell = cp;
       return (&pvt->passwd);

cleanup:
       free(pvt->pwbuf);
       pvt->pwbuf = NULL;
       return (NULL);
}

#endif /* WANT_IRS_PW */
/*! \file */

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