1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
14 */
15
16 /*
17 * This program is installed with an RBAC exec_attr
18 * that allows it to bind a reserved address.
19 * (Or just make it setuid root.)
20 *
21 * To grant privileges to the program using RBAC,
22 * add the following line to /etc/security/exec_attr
23 * Forced Privilege:solaris:cmd:::\
24 * /usr/lib/smbsrv/bind-helper:\
25 * privs=net_privaddr,sys_smb\
26 *
27 * Args: family address port
28 * Does a bind on fileno(stdin)
29 */
30
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <unistd.h>
34 #include <string.h>
35 #include <errno.h>
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <netinet/in.h>
39 #include <arpa/inet.h>
40
41 int
main(int argc,char ** argv)42 main(int argc, char **argv)
43 {
44 struct sockaddr sa;
45 /* LINTED E_BAD_PTR_CAST_ALIGN */
46 struct sockaddr_in *sin = (struct sockaddr_in *)&sa;
47 /* LINTED E_BAD_PTR_CAST_ALIGN */
48 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&sa;
49 int rc, err = 0;
50
51 if (argc < 4) {
52 (void) fprintf(stderr, "usage: %s family address port\n",
53 argv[0]);
54 exit(1);
55 }
56
57 (void) memset(&sa, 0, sizeof (sa));
58 sa.sa_family = atoi(argv[1]);
59 switch (sa.sa_family) {
60 case AF_INET:
61 rc = inet_pton(AF_INET, argv[2], &sin->sin_addr);
62 sin->sin_port = htons(atoi(argv[3]));
63 break;
64 case AF_INET6:
65 rc = inet_pton(AF_INET6, argv[2], &sin6->sin6_addr);
66 sin6->sin6_port = htons(atoi(argv[3]));
67 break;
68 default:
69 rc = 0;
70 break;
71 }
72
73 if (rc > 0)
74 err = 0;
75 else if (rc == 0)
76 err = EINVAL;
77 else if (rc < 0)
78 err = errno;
79 if (err != 0) {
80 (void) fprintf(stderr, "%s: bad proto addr %s %s %s\n",
81 argv[0], argv[1], argv[2], argv[3]);
82 exit(1);
83 }
84
85 if (bind(0, &sa, sizeof (sa)) < 0) {
86 err = errno;
87 (void) fprintf(stderr, "%s: bind: %s\n",
88 argv[0], strerror(err));
89 exit(2);
90 }
91 exit(0);
92 }
93