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 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