1 /* 2 * Copyright (C) 2014, The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <grp.h> 30 #include <pwd.h> 31 #include <stdio.h> 32 #include <sys/types.h> 33 34 int uid_from_user(const char* name, uid_t* uid) { 35 struct passwd* pw = getpwnam(name); 36 if (pw == NULL) { 37 return -1; 38 } 39 *uid = pw->pw_uid; 40 return 0; 41 } 42 43 char* group_from_gid(gid_t gid, int noname) { 44 struct group* g = getgrgid(gid); 45 if (g == NULL) { 46 static char buf[32]; 47 snprintf(buf, sizeof(buf), "%lu", (long) gid); 48 return noname ? NULL : buf; 49 } 50 return g->gr_name; 51 } 52 53 char* user_from_uid(uid_t uid, int noname) { 54 struct passwd* pw = getpwuid(uid); 55 if (pw == NULL) { 56 static char buf[32]; 57 snprintf(buf, sizeof(buf), "%lu", (long) uid); 58 return noname ? NULL : buf; 59 } 60 return pw->pw_name; 61 } 62
