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      1 /* $NetBSD: h_servent.c,v 1.2 2011/04/07 18:14:09 jruoho Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <netdb.h>
     30 #include <stdint.h>
     31 #include <stdlib.h>
     32 #include <unistd.h>
     33 #include <netinet/in.h>
     34 #include <sys/types.h>
     35 #include <stdio.h>
     36 
     37 static void
     38 pserv(const struct servent *svp)
     39 {
     40 	char **pp;
     41 
     42 	printf("name=%s, port=%d, proto=%s, aliases=",
     43 	    svp->s_name, ntohs((uint16_t)svp->s_port), svp->s_proto);
     44 	for (pp = svp->s_aliases; *pp; pp++)
     45 		printf("%s ", *pp);
     46 	printf("\n");
     47 }
     48 
     49 static void
     50 usage(void)
     51 {
     52 	(void)fprintf(stderr, "Usage: %s\n"
     53 	    "\t%s -p <port> [-P <proto>]\n"
     54 	    "\t%s -n <name> [-P <proto>]\n", getprogname(), getprogname(),
     55 	    getprogname());
     56 	exit(1);
     57 }
     58 
     59 int
     60 main(int argc, char *argv[])
     61 {
     62 	struct servent *svp;
     63 	const char *port = NULL, *proto = NULL, *name = NULL;
     64 	int c;
     65 
     66 	while ((c = getopt(argc, argv, "p:n:P:")) != -1) {
     67 		switch (c) {
     68 		case 'n':
     69 			name = optarg;
     70 			break;
     71 		case 'p':
     72 			port = optarg;
     73 			break;
     74 		case 'P':
     75 			proto = optarg;
     76 			break;
     77 		default:
     78 			usage();
     79 		}
     80 	}
     81 
     82 	if (port && name)
     83 		usage();
     84 	if (port) {
     85 		if ((svp = getservbyport(htons(atoi(port)), proto)) != NULL)
     86 			pserv(svp);
     87 		return 0;
     88 	}
     89 	if (name) {
     90 		if ((svp = getservbyname(name, proto)) != NULL)
     91 			pserv(svp);
     92 		return 0;
     93 	}
     94 
     95 	setservent(0);
     96 	while ((svp = getservent()) != NULL)
     97 		pserv(svp);
     98 	endservent();
     99 	return 0;
    100 }
    101