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 27 #ifndef lint 28 static const char rcsid[] = 29 "$Id$"; 30 #endif /* not lint */ 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <unistd.h> 36 #include <stdarg.h> 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 40 #include "pwupd.h" 41 42 int 43 fmtgrentry(char **buf, int * buflen, struct group * grp, int type) 44 { 45 int i, l; 46 47 /* 48 * Since a group line is of arbitrary length, 49 * we need to calculate up-front just how long 50 * it will need to be... 51 */ 52 /* groupname : password : gid : */ 53 l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1; 54 /* group members + comma separator */ 55 for (i = 0; grp->gr_mem[i] != NULL; i++) { 56 l += strlen(grp->gr_mem[i]) + 1; 57 } 58 l += 2; /* For newline & NUL */ 59 if (extendline(buf, buflen, l) == -1) 60 l = -1; 61 else{ 62 /* 63 * Now we can safely format 64 */ 65 if (type == PWF_STANDARD) 66 l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid); 67 else 68 l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid); 69 70 /* 71 * List members 72 */ 73 for (i = 0; grp->gr_mem[i] != NULL; i++) { 74 l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]); 75 } 76 77 (*buf)[l++] = '\n'; 78 (*buf)[l] = '\0'; 79 } 80 return l; 81 } 82 83 84 int 85 fmtgrent(char **buf, int * buflen, struct group * grp) 86 { 87 return fmtgrentry(buf, buflen, grp, PWF_STANDARD); 88 } 89 90 91 static int 92 gr_update(struct group * grp, char const * group, int mode) 93 { 94 int l; 95 char pfx[64]; 96 int grbuflen = 0; 97 char *grbuf = NULL; 98 99 endgrent(); 100 l = snprintf(pfx, sizeof pfx, "%s:", group); 101 102 /* 103 * Update the group file 104 */ 105 if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1) 106 l = -1; 107 else 108 l = fileupdate(_PATH_GROUP, 0644, grbuf, pfx, l, mode); 109 if (grbuf != NULL) 110 free(grbuf); 111 return l; 112 } 113 114 115 int 116 addgrent(struct group * grp) 117 { 118 return gr_update(grp, grp->gr_name, UPD_CREATE); 119 } 120 121 int 122 chggrent(char const * login, struct group * grp) 123 { 124 return gr_update(grp, login, UPD_REPLACE); 125 } 126 127 int 128 delgrent(struct group * grp) 129 { 130 return gr_update(NULL, grp->gr_name, UPD_DELETE); 131 } 132