/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1995, 1996
 *      Bill Paul <wpaul@ctr.columbia.edu>.  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 Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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.
 */

#include <sys/cdefs.h>
#include <err.h>
#include <fcntl.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "yp_extern.h"
#include "ypxfr_extern.h"

char *yp_dir = "";      /* No particular default needed. */
int debug = 1;

static void
usage(void)
{
        fprintf(stderr, "%s\n%s\n%s\n%s\n",
        "usage: yp_mkdb -c",
        "       yp_mkdb -u dbname",
        "       yp_mkdb [-c] [-b] [-s] [-f] [-i inputfile] [-o outputfile]",
        "               [-d domainname ] [-m mastername] inputfile dbname");
        exit(1);
}

#define PERM_SECURE (S_IRUSR|S_IWUSR)
static DB *
open_db(char *path, int flags)
{
        extern HASHINFO openinfo;

        return(dbopen(path, flags, PERM_SECURE, DB_HASH, &openinfo));
}

static void
unwind(char *map)
{
        DB *dbp;
        DBT key, data;

        dbp = open_db(map, O_RDONLY);

        if (dbp == NULL)
                err(1, "open_db(%s) failed", map);

        key.data = NULL;
        while (yp_next_record(dbp, &key, &data, 1, 1) == YP_TRUE)
                printf("%.*s %.*s\n", (int)key.size, (char *)key.data,
                    (int)data.size, (char *)data.data);

        (void)(dbp->close)(dbp);
}

int
main(int argc, char *argv[])
{
        int ch;
        int un = 0;
        int clear = 0;
        int filter_plusminus = 0;
        char *infile = NULL;
        char *map = NULL;
        char *domain = NULL;
        char *infilename = NULL;
        char *outfilename = NULL;
        char *mastername = NULL;
        int interdom = 0;
        int secure = 0;
        DB *dbp;
        DBT key, data;
        char buf[10240];
        char *keybuf, *datbuf;
        FILE *ifp;
        char hname[MAXHOSTNAMELEN + 2];

        while ((ch = getopt(argc, argv, "uhcbsfd:i:o:m:")) != -1) {
                switch (ch) {
                case 'f':
                        filter_plusminus++;
                        break;
                case 'u':
                        un++;
                        break;
                case 'c':
                        clear++;
                        break;
                case 'b':
                        interdom++;
                        break;
                case 's':
                        secure++;
                        break;
                case 'd':
                        domain = optarg;
                        break;
                case 'i':
                        infilename = optarg;
                        break;
                case 'o':
                        outfilename = optarg;
                        break;
                case 'm':
                        mastername = optarg;
                        break;
                case 'h':
                default:
                        usage();
                        break;
                }
        }

        argc -= optind;
        argv += optind;

        if (un) {
                map = argv[0];
                if (map == NULL)
                        usage();
                unwind(map);
                exit(0);

        }

        infile = argv[0];
        map = argv[1];

        if (infile == NULL || map == NULL) {
                if (clear)
                        goto doclear;
                usage();
        }

        if (mastername == NULL) {
                if (gethostname((char *)&hname, sizeof(hname)) == -1)
                        err(1, "gethostname() failed");
                mastername = (char *)&hname;
        }

        /*
         * Note that while we can read from stdin, we can't
         * write to stdout; the db library doesn't let you
         * write to a file stream like that.
         */
        if (!strcmp(infile, "-")) {
                ifp = stdin;
        } else {
                if ((ifp = fopen(infile, "r")) == NULL)
                        err(1, "failed to open %s", infile);
        }

        if ((dbp = open_db(map, O_RDWR|O_EXLOCK|O_EXCL|O_CREAT)) == NULL)
                err(1, "open_db(%s) failed", map);

        if (interdom) {
                key.data = "YP_INTERDOMAIN";
                key.size = sizeof("YP_INTERDOMAIN") - 1;
                data.data = "";
                data.size = 0;
                yp_put_record(dbp, &key, &data, 0);
        }

        if (secure) {
                key.data = "YP_SECURE";
                key.size = sizeof("YP_SECURE") - 1;
                data.data = "";
                data.size = 0;
                yp_put_record(dbp, &key, &data, 0);
        }

        key.data = "YP_MASTER_NAME";
        key.size = sizeof("YP_MASTER_NAME") - 1;
        data.data = mastername;
        data.size = strlen(mastername);
        yp_put_record(dbp, &key, &data, 0);

        key.data = "YP_LAST_MODIFIED";
        key.size = sizeof("YP_LAST_MODIFIED") - 1;
        snprintf(buf, sizeof(buf), "%jd", (intmax_t)time(NULL));
        data.data = (char *)&buf;
        data.size = strlen(buf);
        yp_put_record(dbp, &key, &data, 0);

        if (infilename) {
                key.data = "YP_INPUT_FILE";
                key.size = sizeof("YP_INPUT_FILE") - 1;
                data.data = infilename;
                data.size = strlen(infilename);
                yp_put_record(dbp, &key, &data, 0);
        }

        if (outfilename) {
                key.data = "YP_OUTPUT_FILE";
                key.size = sizeof("YP_OUTPUT_FILE") - 1;
                data.data = outfilename;
                data.size = strlen(outfilename);
                yp_put_record(dbp, &key, &data, 0);
        }

        if (domain) {
                key.data = "YP_DOMAIN_NAME";
                key.size = sizeof("YP_DOMAIN_NAME") - 1;
                data.data = domain;
                data.size = strlen(domain);
                yp_put_record(dbp, &key, &data, 0);
        }

        while (fgets((char *)&buf, sizeof(buf), ifp)) {
                char *sep = NULL;
                int rval;

                /* NUL terminate */
                if ((sep = strchr(buf, '\n')))
                        *sep = '\0';

                /* handle backslash line continuations */
                while (buf[strlen(buf) - 1] == '\\') {
                        fgets((char *)&buf[strlen(buf) - 1],
                                        sizeof(buf) - strlen(buf), ifp);
                        if ((sep = strchr(buf, '\n')))
                                *sep = '\0';
                }

                /* find the separation between the key and data */
                if ((sep = strpbrk(buf, " \t")) == NULL) {
                        warnx("bad input -- no white space: %s", buf);
                        continue;
                }

                /* separate the strings */
                keybuf = (char *)&buf;
                datbuf = sep + 1;
                *sep = '\0';

                /* set datbuf to start at first non-whitespace character */
                while (*datbuf == ' ' || *datbuf == '\t')
                        datbuf++;

                /* Check for silliness. */
                if (filter_plusminus) {
                        if  (*keybuf == '+' || *keybuf == '-' ||
                             *datbuf == '+' || *datbuf == '-') {
                                warnx("bad character at "
                                    "start of line: %s", buf);
                                continue;
                        }
                }

                if (strlen(keybuf) > YPMAXRECORD) {
                        warnx("key too long: %s", keybuf);
                        continue;
                }

                if (!strlen(keybuf)) {
                        warnx("no key -- check source file for blank lines");
                        continue;
                }

                if (strlen(datbuf) > YPMAXRECORD) {
                        warnx("data too long: %s", datbuf);
                        continue;
                }

                key.data = keybuf;
                key.size = strlen(keybuf);
                data.data = datbuf;
                data.size = strlen(datbuf);

                if ((rval = yp_put_record(dbp, &key, &data, 0)) != YP_TRUE) {
                        switch (rval) {
                        case YP_FALSE:
                                warnx("duplicate key '%s' - skipping", keybuf);
                                break;
                        case YP_BADDB:
                        default:
                                err(1,"failed to write new record - exiting");
                                break;
                        }
                }

        }

        (void)(dbp->close)(dbp);

doclear:
        if (clear) {
                char in = 0;
                char *out = NULL;
                int stat;
                if ((stat = callrpc("localhost", YPPROG,YPVERS, YPPROC_CLEAR,
                        (xdrproc_t)xdr_void, &in,
                        (xdrproc_t)xdr_void, out)) != RPC_SUCCESS) {
                        warnx("failed to send 'clear' to local ypserv: %s",
                                clnt_sperrno((enum clnt_stat) stat));
                }
        }

        exit(0);
}