1 /*- 2 * Copyright (C) 1996 3 * David L. Nugent. 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $Id$ 27 */ 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <unistd.h> 33 #include <stdarg.h> 34 #include <errno.h> 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 38 #include "pwupd.h" 39 40 int 41 fmtgrentry(char **buf, int * buflen, struct group * grp, int type) 42 { 43 int i, l; 44 45 /* 46 * Since a group line is of arbitrary length, 47 * we need to calculate up-front just how long 48 * it will need to be... 49 */ 50 /* groupname : password : gid : */ 51 l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1; 52 /* group members + comma separator */ 53 for (i = 0; grp->gr_mem[i] != NULL; i++) { 54 l += strlen(grp->gr_mem[i]) + 1; 55 } 56 l += 2; /* For newline & NUL */ 57 if (extendline(buf, buflen, l) == -1) 58 l = -1; 59 else{ 60 /* 61 * Now we can safely format 62 */ 63 if (type == PWF_STANDARD) 64 l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid); 65 else 66 l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid); 67 68 /* 69 * List members 70 */ 71 for (i = 0; grp->gr_mem[i] != NULL; i++) { 72 l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]); 73 } 74 75 (*buf)[l++] = '\n'; 76 (*buf)[l] = '\0'; 77 } 78 return l; 79 } 80 81 82 int 83 fmtgrent(char **buf, int * buflen, struct group * grp) 84 { 85 return fmtgrentry(buf, buflen, grp, PWF_STANDARD); 86 } 87 88 89 static int 90 gr_update(struct group * grp, char const * group, int mode) 91 { 92 int l; 93 char pfx[64]; 94 int grbuflen = 0; 95 char *grbuf = NULL; 96 97 endgrent(); 98 l = snprintf(pfx, sizeof pfx, "%s:", group); 99 100 /* 101 * Update the group file 102 */ 103 if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1) 104 l = -1; 105 else 106 l = fileupdate(_PATH_GROUP, 0644, grbuf, pfx, l, mode); 107 if (grbuf != NULL) 108 free(grbuf); 109 return l; 110 } 111 112 113 int 114 addgrent(struct group * grp) 115 { 116 return gr_update(grp, grp->gr_name, UPD_CREATE); 117 } 118 119 int 120 chggrent(char const * login, struct group * grp) 121 { 122 return gr_update(grp, login, UPD_REPLACE); 123 } 124 125 int 126 delgrent(struct group * grp) 127 { 128 return gr_update(NULL, grp->gr_name, UPD_DELETE); 129 } 130