/*
 * 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.
 */

/* Imports */

#include "port_before.h"

#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>

#include <errno.h>
#include <fcntl.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 <isc/misc.h>

#include "irs_p.h"
#include "lcl_p.h"
#include "irp_p.h"

#include "port_after.h"

#define MAXALIASES 35
#define MAXADDRSIZE 4

struct pvt {
        struct irp_p           *girpdata;
        int                     warned;
        struct nwent            net;
};

/* Forward */

static void             nw_close(struct irs_nw *);
static struct nwent *   nw_byname(struct irs_nw *, const char *, int);
static struct nwent *   nw_byaddr(struct irs_nw *, void *, int, int);
static struct nwent *   nw_next(struct irs_nw *);
static void             nw_rewind(struct irs_nw *);
static void             nw_minimize(struct irs_nw *);

static void             free_nw(struct nwent *nw);


/* Public */

/*%
 * struct irs_nw * irs_irp_nw(struct irs_acc *this)
 *
 */

struct irs_nw *
irs_irp_nw(struct irs_acc *this) {
        struct irs_nw *nw;
        struct pvt *pvt;

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

        if (!(nw = memget(sizeof *nw))) {
                memput(pvt, sizeof *pvt);
                errno = ENOMEM;
                return (NULL);
        }
        memset(nw, 0x0, sizeof *nw);
        pvt->girpdata = this->private;

        nw->private = pvt;
        nw->close = nw_close;
        nw->byname = nw_byname;
        nw->byaddr = nw_byaddr;
        nw->next = nw_next;
        nw->rewind = nw_rewind;
        nw->minimize = nw_minimize;
        return (nw);
}

/* Methods */

/*%
 * void nw_close(struct irs_nw *this)
 *
 */

static void
nw_close(struct irs_nw *this) {
        struct pvt *pvt = (struct pvt *)this->private;

        nw_minimize(this);

        free_nw(&pvt->net);

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

/*%
 * struct nwent * nw_byaddr(struct irs_nw *this, void *net,
 *                              int length, int type)
 *
 */

static struct nwent *
nw_byaddr(struct irs_nw *this, void *net, int length, int type) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct nwent *nw = &pvt->net;
        char *body = NULL;
        size_t bodylen;
        int code;
        char paddr[24];                 /*%< bigenough for ip4 w/ cidr spec. */
        char text[256];

        if (inet_net_ntop(type, net, length, paddr, sizeof paddr) == NULL) {
                return (NULL);
        }

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

        if (irs_irp_send_command(pvt->girpdata, "getnetbyaddr %s %s",
                                 paddr, ADDR_T_STR(type)) != 0)
                return (NULL);

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

        if (code == IRPD_GETNET_OK) {
                free_nw(nw);
                if (irp_unmarshall_nw(nw, body) != 0) {
                        nw = NULL;
                }
        } else {
                nw = NULL;
        }

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

        return (nw);
}

/*%
 * struct nwent * nw_byname(struct irs_nw *this, const char *name, int type)
 *
 */

static struct nwent *
nw_byname(struct irs_nw *this, const char *name, int type) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct nwent *nw = &pvt->net;
        char *body = NULL;
        size_t bodylen;
        int code;
        char text[256];

        if (nw->n_name != NULL &&
            strcmp(name, nw->n_name) == 0 &&
            nw->n_addrtype == type) {
                return (nw);
        }

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

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

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

        if (code == IRPD_GETNET_OK) {
                free_nw(nw);
                if (irp_unmarshall_nw(nw, body) != 0) {
                        nw = NULL;
                }
        } else {
                nw = NULL;
        }

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

        return (nw);
}

/*%
 * void nw_rewind(struct irs_nw *this)
 *
 */

static void
nw_rewind(struct irs_nw *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, "setnetent") != 0) {
                return;
        }

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

        return;
}

/*%
 *      Prepares the cache if necessary and returns the first, or
 *      next item from it.
 */

static struct nwent *
nw_next(struct irs_nw *this) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct nwent *nw = &pvt->net;
        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, "getnetent") != 0) {
                return (NULL);
        }

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

        if (code == IRPD_GETNET_OK) {
                free_nw(nw);
                if (irp_unmarshall_nw(nw, body) != 0) {
                        nw = NULL;
                }
        } else {
                nw = NULL;
        }

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

/*%
 * void nw_minimize(struct irs_nw *this)
 *
 */

static void
nw_minimize(struct irs_nw *this) {
        struct pvt *pvt = (struct pvt *)this->private;

        irs_irp_disconnect(pvt->girpdata);
}




/* private. */

/*%
 *      deallocate all the memory irp_unmarshall_pw allocated.
 *
 */

static void
free_nw(struct nwent *nw) {
        char **p;

        if (nw == NULL)
                return;

        if (nw->n_name != NULL)
                free(nw->n_name);

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

        if (nw->n_addr != NULL)
                free(nw->n_addr);
}

/*! \file */