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      1 /*	$NetBSD: output_cdb.c,v 1.3 2023/08/08 10:35:21 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Joerg Sonnenberger.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 
     33 #include <sys/endian.h>
     34 #include <cdbw.h>
     35 #include <err.h>
     36 #include <errno.h>
     37 #include <fcntl.h>
     38 #include <stdlib.h>
     39 #include <string.h>
     40 #include <stringlist.h>
     41 #include <unistd.h>
     42 
     43 #include "extern.h"
     44 
     45 static struct cdbw *cdbw;
     46 static int cdbw_fd = -1;
     47 
     48 int
     49 cdb_open(const char *tname)
     50 {
     51 
     52 	if ((cdbw = cdbw_open()) == NULL)
     53 		return -1;
     54 
     55 	if ((cdbw_fd = open(tname, O_WRONLY | O_CREAT | O_TRUNC, 0666)) == -1) {
     56 		cdbw_close(cdbw);
     57 		cdbw = NULL;
     58 		return -1;
     59 	}
     60 	return 0;
     61 }
     62 
     63 void
     64 cdb_add(StringList *sl, size_t port, const char *proto, size_t *cnt,
     65     int warndup)
     66 {
     67 	uint8_t key[255 * 2 + 2];
     68 	uint8_t *data, *data_iter;
     69 	size_t len, protolen, datalen, keylen;
     70 	uint32_t idx;
     71 	size_t i;
     72 
     73 	protolen = strlen(proto);
     74 	if (protolen == 0 || protolen > 255)
     75 		errx(1, "Invalid protocol ``%s'', entry skipped", proto);
     76 
     77 	datalen = 4 + protolen;
     78 	for (i = 0; i < sl->sl_cur; ++i) {
     79 		len = strlen(sl->sl_str[i]);
     80 		if (len == 0 || len > 255)
     81 			errx(1, "Service alias ``%s'' invalid", sl->sl_str[i]);
     82 		datalen += len + 2;
     83 	}
     84 
     85 	data = malloc(datalen);
     86 	if (data == NULL)
     87 		err(1, "malloc failed");
     88 	be16enc(data, port);
     89 	data[2] = protolen;
     90 	data_iter = data + 3;
     91 	memcpy(data_iter, proto, protolen + 1);
     92 	data_iter += protolen + 1;
     93 	for (i = 0; i < sl->sl_cur; ++i) {
     94 		len = strlen(sl->sl_str[i]);
     95 		*data_iter++ = len;
     96 		memcpy(data_iter, sl->sl_str[i], len + 1);
     97 		data_iter += len + 1;
     98 	}
     99 
    100 	if (cdbw_put_data(cdbw, data, datalen, &idx))
    101 		err(1, "cdbw_put_data failed");
    102 
    103 	free(data);
    104 
    105 	key[0] = 0;
    106 	key[1] = protolen;
    107 	be16enc(key + 2, port);
    108 	memcpy(key + 4, proto, protolen);
    109 	keylen = 4 + protolen;
    110 	if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
    111 		warnx("duplicate service: `%zu/%s'", port, proto);
    112 
    113 	key[1] = 0;
    114 	keylen = 4;
    115 	if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
    116 		warnx("duplicate service: `%zu'", port);
    117 
    118 	/* add references for service and all aliases */
    119 	for (i = 0; i < sl->sl_cur; i++) {
    120 		len = strlen(sl->sl_str[i]);
    121 		key[0] = len;
    122 		key[1] = protolen;
    123 		memcpy(key + 2, sl->sl_str[i], len);
    124 		memcpy(key + 2 + len, proto, protolen);
    125 		keylen = 2 + len + protolen;
    126 		if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
    127 			warnx("duplicate service: `%s/%s'", sl->sl_str[i], proto);
    128 
    129 		key[1] = 0;
    130 		keylen = 2 + len;
    131 		if (cdbw_put_key(cdbw, key, keylen, idx) && warndup)
    132 			warnx("duplicate service: `%s'", sl->sl_str[i]);
    133 	}
    134 
    135 	sl_free(sl, 1);
    136 }
    137 
    138 int
    139 cdb_close(void)
    140 {
    141 	int rv, serrno;
    142 
    143 	rv = 0;
    144 	serrno = errno;
    145 
    146 	if (cdbw_output(cdbw, cdbw_fd, "services(5)", NULL)) {
    147 		rv = -1;
    148 		serrno = errno;
    149 	}
    150 
    151 	cdbw_close(cdbw);
    152 	cdbw = NULL;
    153 
    154 	if (close(cdbw_fd)) {
    155 		if (rv == 0)
    156 			serrno = errno;
    157 		rv = -1;
    158 	}
    159 	cdbw_fd = -1;
    160 
    161 	errno = serrno;
    162 	return rv;
    163 }
    164