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      1 /* $NetBSD: broadcast_bind.c,v 1.2 2022/11/17 08:42:06 ozaki-r Exp $ */
      2 /* $OpenBSD: broadcast_bind.c,v 1.2 2015/12/02 20:45:00 mpi Exp $ */
      3 
      4 /*
      5  * Copyright (c) 2015 Vincent Gross <vgross (at) openbsd.org>
      6  *
      7  * Permission to use, copy, modify, and distribute this software for any
      8  * purpose with or without fee is hereby granted, provided that the above
      9  * copyright notice and this permission notice appear in all copies.
     10  *
     11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     18  */
     19 
     20 #include <err.h>
     21 #include <errno.h>
     22 #include <stdio.h>
     23 #include <unistd.h>
     24 #include <stdlib.h>
     25 #include <string.h>
     26 
     27 #include <arpa/inet.h>
     28 
     29 #include <sys/socket.h>
     30 
     31 #include <netinet/in.h>
     32 
     33 
     34 static int
     35 test_bind(char *paddr, struct in_addr *addr, u_int16_t port, int type,
     36     int expected_errno)
     37 {
     38 	int s, rc;
     39 	struct sockaddr_in sin;
     40 
     41 	memset(&sin, 0, sizeof(sin));
     42 	sin.sin_family = AF_INET;
     43 	sin.sin_len = sizeof(sin);
     44 	sin.sin_port = htons(port);
     45 	memcpy(&sin.sin_addr, addr, sizeof(*addr));
     46 
     47 	s = socket(PF_INET, type, 0);
     48 	if (s < 0) {
     49 		warn("socket(PF_INET, %d, 0)", type);
     50 		return (1);
     51 	}
     52 
     53 	rc = bind(s, (struct sockaddr *)&sin, sin.sin_len);
     54 	if ((rc == 0 && expected_errno == 0) ||
     55 	    (rc != 0 && expected_errno == errno)) {
     56 		close(s);
     57 		return (0);
     58 	}
     59 
     60 	warn("bind(%s,%d) (type %d) expected %d, got %d", paddr, port, type,
     61 	    expected_errno, errno);
     62 	close(s);
     63 
     64 	return (1);
     65 }
     66 
     67 int
     68 main(int argc, char *argv[])
     69 {
     70 	int rc;
     71 	struct in_addr uc_addr, err_addr, bc_addr;
     72 	int port = 30000;
     73 
     74 	if (argc != 4)
     75 		errx(1, "needs 2 arguments: <unicast> <error> <broadcast>");
     76 
     77 	rc = inet_pton(AF_INET, argv[1], &uc_addr);
     78 	if (rc != 1) {
     79 		if (rc)
     80 			err(1, "inet_pton(unicast)");
     81 		else
     82 			errx(1, "inet_pton(unicast): error parsing %s",
     83 			    argv[1]);
     84 	}
     85 	rc = inet_pton(AF_INET, argv[2], &err_addr);
     86 	if (rc != 1) {
     87 		if (rc)
     88 			err(1, "inet_pton(error)");
     89 		else
     90 			errx(1, "inet_pton(error): error parsing %s", argv[2]);
     91 	}
     92 	rc = inet_pton(AF_INET, argv[3], &bc_addr);
     93 	if (rc != 1) {
     94 		if (rc)
     95 			err(1, "inet_pton(broadcast)");
     96 		else
     97 			errx(1, "inet_pton(broadcast): error parsing %s",
     98 			    argv[3]);
     99 	}
    100 
    101 	rc = 0;
    102 	rc |= test_bind(argv[1], &uc_addr, port, SOCK_STREAM, 0);
    103 	rc |= test_bind(argv[2], &err_addr, port, SOCK_STREAM, EADDRNOTAVAIL);
    104 #ifdef __NetBSD__
    105 	rc |= test_bind(argv[3], &bc_addr, port, SOCK_STREAM, 0);
    106 #else
    107 	rc |= test_bind(argv[3], &bc_addr, port, SOCK_STREAM, EADDRNOTAVAIL);
    108 #endif
    109 
    110 	rc |= test_bind(argv[2], &err_addr, port, SOCK_STREAM, EADDRNOTAVAIL);
    111 	rc |= test_bind(argv[3], &bc_addr, port, SOCK_DGRAM, 0);
    112 
    113 	return (rc);
    114 }
    115