1 /* $OpenBSD: pw_dup.c,v 1.2 2002/04/29 18:43:08 millert Exp $ */ 2 3 /* 4 * Copyright (c) 2000,2002 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 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. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: pw_dup.c,v 1.2 2002/04/29 18:43:08 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 36 #include <pwd.h> 37 #include <stdlib.h> 38 #include <stdio.h> 39 #include <string.h> 40 41 struct passwd * 42 pw_dup(const struct passwd *pw) 43 { 44 char *cp; 45 size_t nsize, psize, csize, gsize, dsize, ssize, total; 46 struct passwd *newpw; 47 48 /* Allocate in one big chunk for easy freeing */ 49 total = sizeof(struct passwd); 50 if (pw->pw_name) { 51 nsize = strlen(pw->pw_name) + 1; 52 total += nsize; 53 } 54 if (pw->pw_passwd) { 55 psize = strlen(pw->pw_passwd) + 1; 56 total += psize; 57 } 58 if (pw->pw_class) { 59 csize = strlen(pw->pw_class) + 1; 60 total += csize; 61 } 62 if (pw->pw_gecos) { 63 gsize = strlen(pw->pw_gecos) + 1; 64 total += gsize; 65 } 66 if (pw->pw_dir) { 67 dsize = strlen(pw->pw_dir) + 1; 68 total += dsize; 69 } 70 if (pw->pw_shell) { 71 ssize = strlen(pw->pw_shell) + 1; 72 total += ssize; 73 } 74 if ((cp = malloc(total)) == NULL) 75 return(NULL); 76 newpw = (struct passwd *)cp; 77 78 /* 79 * Copy in passwd contents and make strings relative to space 80 * at the end of the buffer. 81 */ 82 (void)memcpy(newpw, pw, sizeof(struct passwd)); 83 cp += sizeof(struct passwd); 84 if (pw->pw_name) { 85 (void)memcpy(cp, pw->pw_name, nsize); 86 newpw->pw_name = cp; 87 cp += nsize; 88 } 89 if (pw->pw_passwd) { 90 (void)memcpy(cp, pw->pw_passwd, psize); 91 newpw->pw_passwd = cp; 92 cp += psize; 93 } 94 if (pw->pw_class) { 95 (void)memcpy(cp, pw->pw_class, csize); 96 newpw->pw_class = cp; 97 cp += csize; 98 } 99 if (pw->pw_gecos) { 100 (void)memcpy(cp, pw->pw_gecos, gsize); 101 newpw->pw_gecos = cp; 102 cp += gsize; 103 } 104 if (pw->pw_dir) { 105 (void)memcpy(cp, pw->pw_dir, dsize); 106 newpw->pw_dir = cp; 107 cp += dsize; 108 } 109 if (pw->pw_shell) { 110 (void)memcpy(cp, pw->pw_shell, ssize); 111 newpw->pw_shell = cp; 112 cp += ssize; 113 } 114 115 return(newpw); 116 } 117