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      1 /*	$NetBSD: services_mkdb.c,v 1.19 2017/01/10 21:04:06 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Luke Mewburn and Christos Zoulas.
      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 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __RCSID("$NetBSD: services_mkdb.c,v 1.19 2017/01/10 21:04:06 christos Exp $");
     35 #endif /* not lint */
     36 
     37 #include <sys/param.h>
     38 #include <sys/stat.h>
     39 
     40 #include <assert.h>
     41 #include <err.h>
     42 #include <fcntl.h>
     43 #include <netdb.h>
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <unistd.h>
     48 #include <util.h>
     49 #include <ctype.h>
     50 #include <errno.h>
     51 #include <stringlist.h>
     52 
     53 #include "extern.h"
     54 
     55 static char tname[MAXPATHLEN];
     56 
     57 #define	PMASK		0xffff
     58 #define PROTOMAX	6
     59 
     60 static StringList ***parseservices(const char *, StringList *);
     61 static void	cleanup(void);
     62 static char    *getstring(const char *, size_t, char **, const char *);
     63 static size_t	getprotoindex(StringList *, const char *);
     64 static const char *getprotostr(StringList *, size_t);
     65 static void	usage(void) __dead;
     66 
     67 int
     68 main(int argc, char *argv[])
     69 {
     70 	int	 ch;
     71 	const char *fname = _PATH_SERVICES;
     72 	const char *dbname = NULL;
     73 	int	 use_db = 0;
     74 	int	 warndup = 0;
     75 	int	 unique = 0;
     76 	int	 otherflag = 0;
     77 	size_t	 cnt = 0;
     78 	StringList *sl, ***svc;
     79 	size_t port, proto;
     80 	void (*addfn)(StringList *, size_t, const char *, size_t *, int);
     81 	int (*closefn)(void);
     82 
     83 	setprogname(argv[0]);
     84 
     85 	while ((ch = getopt(argc, argv, "o:quV:v")) != -1)
     86 		switch (ch) {
     87 		case 'o':
     88 			otherflag = 1;
     89 			dbname = optarg;
     90 			break;
     91 		case 'q':
     92 			otherflag = 1;
     93 			warndup = 0;
     94 			break;
     95 		case 'u':
     96 			unique++;
     97 			break;
     98 		case 'V':
     99 			if (strcmp(optarg, "db") == 0)
    100 				use_db = 1;
    101 			else if (strcmp(optarg, "cdb") == 0)
    102 				use_db = 0;
    103 			else
    104 				usage();
    105 			break;
    106 		case 'v':
    107 			otherflag = 1;
    108 			warndup = 1;
    109 			break;
    110 		default:
    111 			usage();
    112 		}
    113 
    114 	argc -= optind;
    115 	argv += optind;
    116 
    117 	if (argc > 1 || (unique && otherflag))
    118 		usage();
    119 	if (argc == 1)
    120 		fname = argv[0];
    121 
    122 	if (unique)
    123 		uniq(fname);
    124 
    125 	if (dbname == NULL)
    126 		dbname = use_db ? _PATH_SERVICES_DB : _PATH_SERVICES_CDB;
    127 
    128 	svc = parseservices(fname, sl = sl_init());
    129 
    130 	if (atexit(cleanup))
    131 		err(1, "Cannot install exit handler");
    132 
    133 	(void)snprintf(tname, sizeof(tname), "%s.tmp", dbname);
    134 
    135 	if (use_db) {
    136 		if (db_open(tname))
    137 			err(1, "Error opening temporary database `%s'", tname);
    138 		addfn = db_add;
    139 		closefn = db_close;
    140 	} else {
    141 		if (cdb_open(tname))
    142 			err(1, "Error opening temporary database `%s'", tname);
    143 		addfn = cdb_add;
    144 		closefn = cdb_close;
    145 	}
    146 
    147 	for (port = 0; port < PMASK + 1; port++) {
    148 		if (svc[port] == NULL)
    149 			continue;
    150 
    151 		for (proto = 0; proto < PROTOMAX; proto++) {
    152 			StringList *s;
    153 			if ((s = svc[port][proto]) == NULL)
    154 				continue;
    155 			(addfn)(s, port, getprotostr(sl, proto), &cnt, warndup);
    156 		}
    157 
    158 		free(svc[port]);
    159 	}
    160 
    161 	free(svc);
    162 	sl_free(sl, 1);
    163 
    164 	if ((closefn)())
    165 		err(1, "Error writing temporary database `%s'", tname);
    166 
    167 	if (rename(tname, dbname) == -1)
    168 		err(1, "Cannot rename `%s' to `%s'", tname, dbname);
    169 
    170 	return 0;
    171 }
    172 
    173 static StringList ***
    174 parseservices(const char *fname, StringList *sl)
    175 {
    176 	size_t len, line, pindex;
    177 	FILE *fp;
    178 	StringList ***svc, *s;
    179 	char *p, *ep;
    180 
    181 	if ((fp = fopen(fname, "r")) == NULL)
    182 		err(1, "Cannot open `%s'", fname);
    183 
    184 	line = 0;
    185 	svc = ecalloc(PMASK + 1, sizeof(StringList **));
    186 
    187 	/* XXX: change NULL to "\0\0#" when fparseln fixed */
    188 	for (; (p = fparseln(fp, &len, &line, NULL, 0)) != NULL; free(p)) {
    189 		char	*name, *port, *proto, *aliases, *cp, *alias;
    190 		unsigned long pnum;
    191 
    192 		if (len == 0)
    193 			continue;
    194 
    195 		for (cp = p; *cp && isspace((unsigned char)*cp); cp++)
    196 			continue;
    197 
    198 		if (*cp == '\0' || *cp == '#')
    199 			continue;
    200 
    201 		if ((name = getstring(fname, line, &cp, "name")) == NULL)
    202 			continue;
    203 
    204 		if ((port = getstring(fname, line, &cp, "port")) == NULL)
    205 			continue;
    206 
    207 		if (cp) {
    208 			for (aliases = cp; *cp && *cp != '#'; cp++)
    209 				continue;
    210 
    211 			if (*cp)
    212 				*cp = '\0';
    213 		} else
    214 			aliases = NULL;
    215 
    216 		proto = strchr(port, '/');
    217 		if (proto == NULL || proto[1] == '\0') {
    218 			warnx("%s, %zu: no protocol found", fname, line);
    219 			continue;
    220 		}
    221 		*proto++ = '\0';
    222 
    223 		errno = 0;
    224 		pnum = strtoul(port, &ep, 0);
    225 		if (*port == '\0' || *ep != '\0') {
    226 			warnx("%s, %zu: invalid port `%s'", fname, line, port);
    227 			continue;
    228 		}
    229 		if ((errno == ERANGE && pnum == ULONG_MAX) || pnum > PMASK) {
    230 			warnx("%s, %zu: port too big `%s'", fname, line, port);
    231 			continue;
    232 		}
    233 
    234 		if (svc[pnum] == NULL)
    235 			svc[pnum] = ecalloc(PROTOMAX, sizeof(StringList *));
    236 
    237 		pindex = getprotoindex(sl, proto);
    238 		if (svc[pnum][pindex] == NULL)
    239 			s = svc[pnum][pindex] = sl_init();
    240 		else
    241 			s = svc[pnum][pindex];
    242 
    243 		if (strlen(name) > 255) {
    244 			warnx("%s, %zu: invalid name too long `%s'", fname,
    245 			    line, name);
    246 			continue;
    247 		}
    248 
    249 		/* build list of aliases */
    250 		if (sl_find(s, name) == NULL)
    251 			(void)sl_add(s, estrdup(name));
    252 
    253 		if (aliases) {
    254 			while ((alias = strsep(&aliases, " \t")) != NULL) {
    255 				if (alias[0] == '\0')
    256 					continue;
    257 				if (strlen(alias) > 255) {
    258 					warnx("%s, %zu: alias name too long `%s'",
    259 					    fname, line, alias);
    260 		    			continue;
    261 				}
    262 				if (sl_find(s, alias) == NULL)
    263 					(void)sl_add(s, estrdup(alias));
    264 			}
    265 		}
    266 	}
    267 	(void)fclose(fp);
    268 	return svc;
    269 }
    270 
    271 /*
    272  * cleanup(): Remove temporary files upon exit
    273  */
    274 static void
    275 cleanup(void)
    276 {
    277 	if (tname[0])
    278 		(void)unlink(tname);
    279 }
    280 
    281 static char *
    282 getstring(const char *fname, size_t line, char **cp, const char *tag)
    283 {
    284 	char *str;
    285 
    286 	while ((str = strsep(cp, " \t")) != NULL && *str == '\0')
    287 		continue;
    288 
    289 	if (str == NULL)
    290 		warnx("%s, %zu: no %s found", fname, line, tag);
    291 
    292 	return str;
    293 }
    294 
    295 static size_t
    296 getprotoindex(StringList *sl, const char *str)
    297 {
    298 	size_t i;
    299 
    300 	for (i= 0; i < sl->sl_cur; i++)
    301 		if (strcmp(sl->sl_str[i], str) == 0)
    302 			return i;
    303 
    304 	if (i == PROTOMAX)
    305 		errx(1, "Ran out of protocols adding `%s';"
    306 		    " recompile with larger PROTOMAX", str);
    307 	(void)sl_add(sl, estrdup(str));
    308 	return i;
    309 }
    310 
    311 static const char *
    312 getprotostr(StringList *sl, size_t i)
    313 {
    314 	assert(i < sl->sl_cur);
    315 	return sl->sl_str[i];
    316 }
    317 
    318 static void
    319 usage(void)
    320 {
    321 	(void)fprintf(stderr, "Usage:\t%s [-q] [-o <db>] [-V cdb|db] [<servicefile>]\n"
    322 	    "\t%s -u [<servicefile>]\n", getprogname(), getprogname());
    323 	exit(1);
    324 }
    325