/*      $NetBSD: irp_ho.c,v 1.1.1.2 2012/09/09 16:07:58 christos Exp $  */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (c) 1996,1998 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: irp_ho.c,v 1.3 2005/04/27 04:56:28 sra Exp ";
#endif /* LIBC_SCCS and not lint */

/* Imports. */

#include "port_before.h"

#include <syslog.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 <syslog.h>

#include <irs.h>
#include <irp.h>
#include <isc/irpmarshall.h>
#include <isc/memcluster.h>

#include "irs_p.h"
#include "dns_p.h"
#include "irp_p.h"

#include "port_after.h"

/* Definitions. */

#define MAXALIASES      35
#define MAXADDRS        35
#define Max(a,b)        ((a) > (b) ? (a) : (b))


struct pvt {
       struct irp_p           *girpdata;
       int                     warned;
       struct hostent          host;
};

/* 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 void             free_host(struct hostent *ho);
static struct addrinfo * ho_addrinfo(struct irs_ho *this, const char *name,
                                    const struct addrinfo *pai);

/* Public. */

/*%
* struct irs_ho * irs_irp_ho(struct irs_acc *this)
*
* Notes:
*
*      Initializes the irp_ho module.
*
*/

struct irs_ho *
irs_irp_ho(struct irs_acc *this) {
       struct irs_ho *ho;
       struct pvt *pvt;

       if (!(ho = memget(sizeof *ho))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(ho, 0x0, sizeof *ho);

       if (!(pvt = memget(sizeof *pvt))) {
               memput(ho, sizeof *ho);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       pvt->girpdata = this->private;

       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->addrinfo = ho_addrinfo;

       return (ho);
}

/* Methods. */

/*%
*      Closes down the module.
*
*/

static void
ho_close(struct irs_ho *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       ho_minimize(this);

       free_host(&pvt->host);

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



/*
* struct hostent * ho_byname(struct irs_ho *this, const char *name)
*
*/

static struct hostent *
ho_byname(struct irs_ho *this, const char *name) {
       return (ho_byname2(this, name, AF_INET));
}





/*
* struct hostent * ho_byname2(struct irs_ho *this, const char *name, int af)
*
*/

static struct hostent *
ho_byname2(struct irs_ho *this, const char *name, int af) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct hostent *ho = &pvt->host;
       char *body = NULL;
       size_t bodylen;
       int code;
       char text[256];

       if (ho->h_name != NULL &&
           strcmp(name, ho->h_name) == 0 &&
           af == ho->h_addrtype) {
               return (ho);
       }

       if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
               return (NULL);
       }

       if (irs_irp_send_command(pvt->girpdata, "gethostbyname2 %s %s",
                                name, ADDR_T_STR(af)) != 0)
               return (NULL);

       if (irs_irp_get_full_response(pvt->girpdata, &code,
                                     text, sizeof text,
                                     &body, &bodylen) != 0) {
               return (NULL);
       }

       if (code == IRPD_GETHOST_OK) {
               free_host(ho);
               if (irp_unmarshall_ho(ho, body) != 0) {
                       ho = NULL;
               }
       } else {
               ho = NULL;
       }

       if (body != NULL) {
               memput(body, bodylen);
       }

       return (ho);
}



/*
* struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
*                         int len, int af)
*
*/

static struct hostent *
ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct hostent *ho = &pvt->host;
       char *body = NULL;
       size_t bodylen;
       int code;
       char **p;
       char paddr[MAXPADDRSIZE];
       char text[256];

       if (ho->h_name != NULL &&
           af == ho->h_addrtype &&
           len == ho->h_length) {
               for (p = ho->h_addr_list ; *p != NULL ; p++) {
                       if (memcmp(*p, addr, len) == 0)
                               return (ho);
               }
       }

       if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
               return (NULL);
       }

       if (inet_ntop(af, addr, paddr, sizeof paddr) == NULL) {
               return (NULL);
       }

       if (irs_irp_send_command(pvt->girpdata, "gethostbyaddr %s %s",
                                paddr, ADDR_T_STR(af)) != 0) {
               return (NULL);
       }

       if (irs_irp_get_full_response(pvt->girpdata, &code,
                                     text, sizeof text,
                                     &body, &bodylen) != 0) {
               return (NULL);
       }

       if (code == IRPD_GETHOST_OK) {
               free_host(ho);
               if (irp_unmarshall_ho(ho, body) != 0) {
                       ho = NULL;
               }
       } else {
               ho = NULL;
       }

       if (body != NULL) {
               memput(body, bodylen);
       }

       return (ho);
}

/*%
*      The implementation for gethostent(3). The first time it's
*      called all the data is pulled from the remote(i.e. what
*      the maximum number of gethostent(3) calls would return)
*      and that data is cached.
*
*/

static struct hostent *
ho_next(struct irs_ho *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct hostent *ho = &pvt->host;
       char *body;
       size_t bodylen;
       int code;
       char text[256];

       if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
               return (NULL);
       }

       if (irs_irp_send_command(pvt->girpdata, "gethostent") != 0) {
               return (NULL);
       }

       if (irs_irp_get_full_response(pvt->girpdata, &code,
                                     text, sizeof text,
                                     &body, &bodylen) != 0) {
               return (NULL);
       }

       if (code == IRPD_GETHOST_OK) {
               free_host(ho);
               if (irp_unmarshall_ho(ho, body) != 0) {
                       ho = NULL;
               }
       } else {
               ho = NULL;
       }

       if (body != NULL) {
               memput(body, bodylen);
       }

       return (ho);
}

/*%
* void ho_rewind(struct irs_ho *this)
*
*/

static void
ho_rewind(struct irs_ho *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       char text[256];
       int code;

       if (irs_irp_connection_setup(pvt->girpdata, &pvt->warned) != 0) {
               return;
       }

       if (irs_irp_send_command(pvt->girpdata, "sethostent") != 0) {
               return;
       }

       code = irs_irp_read_response(pvt->girpdata, text, sizeof text);
       if (code != IRPD_GETHOST_SETOK) {
               if (irp_log_errors) {
                       syslog(LOG_WARNING, "sethostent failed: %s", text);
               }
       }

       return;
}

/*%
* void ho_minimize(struct irs_ho *this)
*
*/

static void
ho_minimize(struct irs_ho *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       free_host(&pvt->host);

       irs_irp_disconnect(pvt->girpdata);
}

/*%
* void free_host(struct hostent *ho)
*
*/

static void
free_host(struct hostent *ho) {
       char **p;

       if (ho == NULL) {
               return;
       }

       if (ho->h_name != NULL)
               free(ho->h_name);

       if (ho->h_aliases != NULL) {
               for (p = ho->h_aliases ; *p != NULL ; p++)
                       free(*p);
               free(ho->h_aliases);
       }

       if (ho->h_addr_list != NULL) {
               for (p = ho->h_addr_list ; *p != NULL ; p++)
                       free(*p);
               free(ho->h_addr_list);
       }
}

/* dummy */
static struct addrinfo *
ho_addrinfo(struct irs_ho *this, const char *name, const struct addrinfo *pai)
{
       UNUSED(this);
       UNUSED(name);
       UNUSED(pai);
       return(NULL);
}

/*! \file */

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