/*      $NetBSD: services_mkdb.c,v 1.19 2017/01/10 21:04:06 christos Exp $      */

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn and Christos Zoulas.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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>
#ifndef lint
__RCSID("$NetBSD: services_mkdb.c,v 1.19 2017/01/10 21:04:06 christos Exp $");
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>

#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <ctype.h>
#include <errno.h>
#include <stringlist.h>

#include "extern.h"

static char tname[MAXPATHLEN];

#define PMASK           0xffff
#define PROTOMAX        6

static StringList ***parseservices(const char *, StringList *);
static void     cleanup(void);
static char    *getstring(const char *, size_t, char **, const char *);
static size_t   getprotoindex(StringList *, const char *);
static const char *getprotostr(StringList *, size_t);
static void     usage(void) __dead;

int
main(int argc, char *argv[])
{
        int      ch;
        const char *fname = _PATH_SERVICES;
        const char *dbname = NULL;
        int      use_db = 0;
        int      warndup = 0;
        int      unique = 0;
        int      otherflag = 0;
        size_t   cnt = 0;
        StringList *sl, ***svc;
        size_t port, proto;
        void (*addfn)(StringList *, size_t, const char *, size_t *, int);
        int (*closefn)(void);

        setprogname(argv[0]);

        while ((ch = getopt(argc, argv, "o:quV:v")) != -1)
                switch (ch) {
                case 'o':
                        otherflag = 1;
                        dbname = optarg;
                        break;
                case 'q':
                        otherflag = 1;
                        warndup = 0;
                        break;
                case 'u':
                        unique++;
                        break;
                case 'V':
                        if (strcmp(optarg, "db") == 0)
                                use_db = 1;
                        else if (strcmp(optarg, "cdb") == 0)
                                use_db = 0;
                        else
                                usage();
                        break;
                case 'v':
                        otherflag = 1;
                        warndup = 1;
                        break;
                default:
                        usage();
                }

        argc -= optind;
        argv += optind;

        if (argc > 1 || (unique && otherflag))
                usage();
        if (argc == 1)
                fname = argv[0];

        if (unique)
                uniq(fname);

        if (dbname == NULL)
                dbname = use_db ? _PATH_SERVICES_DB : _PATH_SERVICES_CDB;

        svc = parseservices(fname, sl = sl_init());

        if (atexit(cleanup))
                err(1, "Cannot install exit handler");

        (void)snprintf(tname, sizeof(tname), "%s.tmp", dbname);

        if (use_db) {
                if (db_open(tname))
                        err(1, "Error opening temporary database `%s'", tname);
                addfn = db_add;
                closefn = db_close;
        } else {
                if (cdb_open(tname))
                        err(1, "Error opening temporary database `%s'", tname);
                addfn = cdb_add;
                closefn = cdb_close;
        }

        for (port = 0; port < PMASK + 1; port++) {
                if (svc[port] == NULL)
                        continue;

                for (proto = 0; proto < PROTOMAX; proto++) {
                        StringList *s;
                        if ((s = svc[port][proto]) == NULL)
                                continue;
                        (addfn)(s, port, getprotostr(sl, proto), &cnt, warndup);
                }

                free(svc[port]);
        }

        free(svc);
        sl_free(sl, 1);

        if ((closefn)())
                err(1, "Error writing temporary database `%s'", tname);

        if (rename(tname, dbname) == -1)
                err(1, "Cannot rename `%s' to `%s'", tname, dbname);

        return 0;
}

static StringList ***
parseservices(const char *fname, StringList *sl)
{
        size_t len, line, pindex;
        FILE *fp;
        StringList ***svc, *s;
        char *p, *ep;

        if ((fp = fopen(fname, "r")) == NULL)
                err(1, "Cannot open `%s'", fname);

        line = 0;
        svc = ecalloc(PMASK + 1, sizeof(StringList **));

        /* XXX: change NULL to "\0\0#" when fparseln fixed */
        for (; (p = fparseln(fp, &len, &line, NULL, 0)) != NULL; free(p)) {
                char    *name, *port, *proto, *aliases, *cp, *alias;
                unsigned long pnum;

                if (len == 0)
                        continue;

                for (cp = p; *cp && isspace((unsigned char)*cp); cp++)
                        continue;

                if (*cp == '\0' || *cp == '#')
                        continue;

                if ((name = getstring(fname, line, &cp, "name")) == NULL)
                        continue;

                if ((port = getstring(fname, line, &cp, "port")) == NULL)
                        continue;

                if (cp) {
                        for (aliases = cp; *cp && *cp != '#'; cp++)
                                continue;

                        if (*cp)
                                *cp = '\0';
                } else
                        aliases = NULL;

                proto = strchr(port, '/');
                if (proto == NULL || proto[1] == '\0') {
                        warnx("%s, %zu: no protocol found", fname, line);
                        continue;
                }
                *proto++ = '\0';

                errno = 0;
                pnum = strtoul(port, &ep, 0);
                if (*port == '\0' || *ep != '\0') {
                        warnx("%s, %zu: invalid port `%s'", fname, line, port);
                        continue;
                }
                if ((errno == ERANGE && pnum == ULONG_MAX) || pnum > PMASK) {
                        warnx("%s, %zu: port too big `%s'", fname, line, port);
                        continue;
                }

                if (svc[pnum] == NULL)
                        svc[pnum] = ecalloc(PROTOMAX, sizeof(StringList *));

                pindex = getprotoindex(sl, proto);
                if (svc[pnum][pindex] == NULL)
                        s = svc[pnum][pindex] = sl_init();
                else
                        s = svc[pnum][pindex];
                
                if (strlen(name) > 255) {
                        warnx("%s, %zu: invalid name too long `%s'", fname,
                            line, name);
                        continue;
                }
                
                /* build list of aliases */
                if (sl_find(s, name) == NULL)
                        (void)sl_add(s, estrdup(name));

                if (aliases) {
                        while ((alias = strsep(&aliases, " \t")) != NULL) {
                                if (alias[0] == '\0')
                                        continue;
                                if (strlen(alias) > 255) {
                                        warnx("%s, %zu: alias name too long `%s'",
                                            fname, line, alias);
                                        continue;
                                }
                                if (sl_find(s, alias) == NULL)
                                        (void)sl_add(s, estrdup(alias));
                        }
                }
        }
        (void)fclose(fp);
        return svc;
}

/*
 * cleanup(): Remove temporary files upon exit
 */
static void
cleanup(void)
{
        if (tname[0])
                (void)unlink(tname);
}

static char *
getstring(const char *fname, size_t line, char **cp, const char *tag)
{
        char *str;

        while ((str = strsep(cp, " \t")) != NULL && *str == '\0')
                continue;

        if (str == NULL)
                warnx("%s, %zu: no %s found", fname, line, tag);

        return str;
}

static size_t
getprotoindex(StringList *sl, const char *str)
{
        size_t i;

        for (i= 0; i < sl->sl_cur; i++)
                if (strcmp(sl->sl_str[i], str) == 0)
                        return i;

        if (i == PROTOMAX)
                errx(1, "Ran out of protocols adding `%s';"
                    " recompile with larger PROTOMAX", str);
        (void)sl_add(sl, estrdup(str));
        return i;
}

static const char *
getprotostr(StringList *sl, size_t i)
{
        assert(i < sl->sl_cur);
        return sl->sl_str[i];
}

static void
usage(void)
{
        (void)fprintf(stderr, "Usage:\t%s [-q] [-o <db>] [-V cdb|db] [<servicefile>]\n"
            "\t%s -u [<servicefile>]\n", getprogname(), getprogname());
        exit(1);
}