1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 2001 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * runat: run a command in attribute directory. 31 * 32 * runat file [command] 33 * 34 * when command is not specified an interactive shell is started 35 * in the attribute directory. 36 */ 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 #include <fcntl.h> 42 #include <libintl.h> 43 #include <errno.h> 44 #include <strings.h> 45 46 static void 47 usage() 48 { 49 (void) fprintf(stderr, gettext("usage: runat filename [command]\n")); 50 } 51 52 int 53 main(int argc, char *argv[]) 54 { 55 int fd; 56 int dirfd; 57 int i; 58 int argslen; 59 char *shell; 60 char *args[4]; 61 char *cmdargs; 62 63 if (argc < 2) { 64 usage(); 65 exit(127); 66 } 67 68 if ((fd = open64(argv[1], O_RDONLY)) == -1) { 69 (void) fprintf(stderr, 70 gettext("runat: cannot open %s: %s\n"), argv[1], 71 strerror(errno)); 72 exit(125); 73 } 74 75 if ((dirfd = openat64(fd, ".", O_RDONLY|O_XATTR)) == -1) { 76 (void) fprintf(stderr, 77 gettext("runat: cannot open attribute" 78 " directory for %s: %s\n"), argv[1], strerror(errno)); 79 exit(125); 80 } 81 82 (void) close(fd); 83 84 if (fchdir(dirfd) == -1) { 85 (void) fprintf(stderr, 86 gettext("runat: cannot fchdir to attribute" 87 " directory: %s\n"), strerror(errno)); 88 exit(125); 89 } 90 91 if (argc < 3) { 92 shell = getenv("SHELL"); 93 if (shell == NULL) { 94 (void) fprintf(stderr, 95 gettext( 96 "runat: shell not found, using /bin/sh\n")); 97 shell = "/bin/sh"; 98 } 99 100 (void) execl(shell, shell, NULL); 101 (void) fprintf(stderr, 102 gettext("runat: Failed to exec %s: %s\n"), shell, 103 strerror(errno)); 104 return (126); 105 } 106 107 /* 108 * Count up the size of all of the args 109 */ 110 111 for (i = 2, argslen = 0; i < argc; i++) { 112 argslen += strlen(argv[i]) + 1; 113 } 114 115 cmdargs = calloc(1, argslen); 116 if (cmdargs == NULL) { 117 (void) fprintf(stderr, gettext( 118 "runat: failed to allocate memory for" 119 " command arguments: %s\n"), strerror(errno)); 120 exit(126); 121 } 122 123 124 /* 125 * create string with all of the args concatenated together 126 * This is done so that the shell will interpret the args 127 * and do globbing if necessary. 128 */ 129 for (i = 2; i < argc; i++) { 130 if (strlcat(cmdargs, argv[i], argslen) >= argslen) { 131 (void) fprintf(stderr, gettext( 132 "runat: arguments won't fit in" 133 " allocated buffer\n")); 134 exit(126); 135 } 136 137 /* 138 * tack on a space if there are more args 139 */ 140 if ((i + 1) < argc) { 141 if (strlcat(cmdargs, " ", argslen) >= argslen) { 142 (void) fprintf(stderr, gettext( 143 "runat: arguments won't fit in" 144 " allocated buffer\n")); 145 exit(126); 146 } 147 } 148 149 } 150 151 args[0] = "/bin/sh"; 152 args[1] = "-c"; 153 args[2] = cmdargs; 154 args[3] = NULL; 155 (void) execvp(args[0], args); 156 (void) fprintf(stderr, gettext("runat: Failed to exec %s: %s\n"), 157 argv[0], strerror(errno)); 158 return (126); 159 } 160