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 /* 28 * runat: run a command in attribute directory. 29 * 30 * runat file [command] 31 * 32 * when command is not specified an interactive shell is started 33 * in the attribute directory. 34 */ 35 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 #include <fcntl.h> 40 #include <libintl.h> 41 #include <errno.h> 42 #include <strings.h> 43 44 static void 45 usage() 46 { 47 (void) fprintf(stderr, gettext("usage: runat filename [command]\n")); 48 } 49 50 int 51 main(int argc, char *argv[]) 52 { 53 int fd; 54 int dirfd; 55 int i; 56 int argslen; 57 char *shell; 58 char *args[4]; 59 char *cmdargs; 60 61 if (argc < 2) { 62 usage(); 63 exit(127); 64 } 65 66 if ((fd = open64(argv[1], O_RDONLY)) == -1) { 67 (void) fprintf(stderr, 68 gettext("runat: cannot open %s: %s\n"), argv[1], 69 strerror(errno)); 70 exit(125); 71 } 72 73 if ((dirfd = openat64(fd, ".", O_RDONLY|O_XATTR)) == -1) { 74 (void) fprintf(stderr, 75 gettext("runat: cannot open attribute" 76 " directory for %s: %s\n"), argv[1], strerror(errno)); 77 exit(125); 78 } 79 80 (void) close(fd); 81 82 if (fchdir(dirfd) == -1) { 83 (void) fprintf(stderr, 84 gettext("runat: cannot fchdir to attribute" 85 " directory: %s\n"), strerror(errno)); 86 exit(125); 87 } 88 89 if (argc < 3) { 90 shell = getenv("SHELL"); 91 if (shell == NULL) { 92 (void) fprintf(stderr, 93 gettext( 94 "runat: shell not found, using /bin/sh\n")); 95 shell = "/bin/sh"; 96 } 97 98 (void) execl(shell, shell, NULL); 99 (void) fprintf(stderr, 100 gettext("runat: Failed to exec %s: %s\n"), shell, 101 strerror(errno)); 102 return (126); 103 } 104 105 /* 106 * Count up the size of all of the args 107 */ 108 109 for (i = 2, argslen = 0; i < argc; i++) { 110 argslen += strlen(argv[i]) + 1; 111 } 112 113 cmdargs = calloc(1, argslen); 114 if (cmdargs == NULL) { 115 (void) fprintf(stderr, gettext( 116 "runat: failed to allocate memory for" 117 " command arguments: %s\n"), strerror(errno)); 118 exit(126); 119 } 120 121 122 /* 123 * create string with all of the args concatenated together 124 * This is done so that the shell will interpret the args 125 * and do globbing if necessary. 126 */ 127 for (i = 2; i < argc; i++) { 128 if (strlcat(cmdargs, argv[i], argslen) >= argslen) { 129 (void) fprintf(stderr, gettext( 130 "runat: arguments won't fit in" 131 " allocated buffer\n")); 132 exit(126); 133 } 134 135 /* 136 * tack on a space if there are more args 137 */ 138 if ((i + 1) < argc) { 139 if (strlcat(cmdargs, " ", argslen) >= argslen) { 140 (void) fprintf(stderr, gettext( 141 "runat: arguments won't fit in" 142 " allocated buffer\n")); 143 exit(126); 144 } 145 } 146 147 } 148 149 args[0] = "/bin/sh"; 150 args[1] = "-c"; 151 args[2] = cmdargs; 152 args[3] = NULL; 153 (void) execvp(args[0], args); 154 (void) fprintf(stderr, gettext("runat: Failed to exec %s: %s\n"), 155 argv[0], strerror(errno)); 156 return (126); 157 } 158