1 /* $NetBSD: whereis.c,v 1.21 2008/10/17 10:53:26 apb Exp $ */ 2 3 /*- 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)whereis.c 8.3 (Berkeley) 5/4/95"; 41 #endif 42 __RCSID("$NetBSD: whereis.c,v 1.21 2008/10/17 10:53:26 apb Exp $"); 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 #include <sys/sysctl.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 static void usage(void) __dead; 57 58 int 59 main(int argc, char *argv[]) 60 { 61 struct stat sb; 62 size_t len; 63 #ifdef __minix 64 int ch; 65 #else 66 int ch, mib[2]; 67 #endif /* def __minix */ 68 char *p, *std, path[MAXPATHLEN]; 69 const char *t; 70 int which = strcmp(getprogname(), "which") == 0; 71 int useenvpath = which, found = 0; 72 gid_t egid = getegid(); 73 uid_t euid = geteuid(); 74 75 /* To make access(2) do what we want */ 76 if (setgid(egid) == -1) 77 err(1, "Can't set gid to %lu", (unsigned long)egid); 78 if (setuid(euid) == -1) 79 err(1, "Can't set uid to %lu", (unsigned long)euid); 80 81 while ((ch = getopt(argc, argv, "ap")) != -1) 82 switch (ch) { 83 case 'a': 84 which = 0; 85 break; 86 case 'p': 87 useenvpath = 1; /* use environment for PATH */ 88 break; 89 90 case '?': 91 default: 92 usage(); 93 } 94 argc -= optind; 95 argv += optind; 96 97 if (argc == 0) 98 usage(); 99 100 if (useenvpath) { 101 if ((std = getenv("PATH")) == NULL) 102 errx(1, "PATH environment variable is not set"); 103 } else { 104 /* Retrieve the standard path. */ 105 #ifdef __minix 106 /* 107 Note: This path is currently defined here and should probably be defined 108 here, in "ash" or in "sh". 109 To minimize code changes, the path has been hard coded into this file. 110 However, if this path needs to be used in other ported programs, please 111 move this define to <minix/paths.h> and add the include to this file 112 and all files that use _PATH_USER_CS_PATH. 113 */ 114 #define _PATH_USER_CS_PATH "/usr/X11R7/sbin:/usr/local/sbin:/usr/pkg/sbin:/usr/sbin:/sbin:/usr/X11R7/bin:/usr/local/bin:/usr/pkg/bin:/usr/bin:/bin:/usr/games" 115 std = strdup(_PATH_USER_CS_PATH); 116 #else 117 mib[0] = CTL_USER; 118 mib[1] = USER_CS_PATH; 119 if (sysctl(mib, 2, NULL, &len, NULL, 0) == -1) 120 err(1, "sysctl: user.cs_path"); 121 if (len == 0) 122 errx(1, "sysctl: user.cs_path (zero length)"); 123 if ((std = malloc(len)) == NULL) 124 err(1, NULL); 125 if (sysctl(mib, 2, std, &len, NULL, 0) == -1) 126 err(1, "sysctl: user.cs_path"); 127 #endif /* def __minix */ 128 } 129 130 /* For each path, for each program... */ 131 for (; *argv; ++argv) { 132 if (**argv == '/') { 133 if (stat(*argv, &sb) == -1) 134 continue; /* next argv */ 135 if (!S_ISREG(sb.st_mode)) 136 continue; /* next argv */ 137 if (access(*argv, X_OK) == -1) 138 continue; /* next argv */ 139 (void)printf("%s\n", *argv); 140 found++; 141 if (which) 142 continue; /* next argv */ 143 } else for (p = std; p; ) { 144 t = p; 145 if ((p = strchr(p, ':')) != NULL) { 146 *p = '\0'; 147 if (t == p) 148 t = "."; 149 } else 150 if (strlen(t) == 0) 151 t = "."; 152 (void)snprintf(path, sizeof(path), "%s/%s", t, *argv); 153 len = snprintf(path, sizeof(path), "%s/%s", t, *argv); 154 if (p) 155 *p++ = ':'; 156 if (len >= sizeof(path)) 157 continue; /* next p */ 158 if (stat(path, &sb) == -1) 159 continue; /* next p */ 160 if (!S_ISREG(sb.st_mode)) 161 continue; /* next p */ 162 if (access(path, X_OK) == -1) 163 continue; /* next p */ 164 (void)printf("%s\n", path); 165 found++; 166 if (which) 167 break; /* next argv */ 168 } 169 } 170 171 return ((found == 0) ? 3 : ((found >= argc) ? 0 : 2)); 172 } 173 174 static void 175 usage(void) 176 { 177 178 (void)fprintf(stderr, "Usage: %s [-ap] program [...]\n", getprogname()); 179 exit(1); 180 } 181