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 "$FreeBSD$"; 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 #include <sys/param.h> 40 41 #include "pwupd.h" 42 43 static char * grpath = _PATH_PWD; 44 45 int 46 setgrdir(const char * dir) 47 { 48 if (dir == NULL) 49 return -1; 50 else { 51 char * d = malloc(strlen(dir)+1); 52 if (d == NULL) 53 return -1; 54 grpath = strcpy(d, dir); 55 } 56 return 0; 57 } 58 59 char * 60 getgrpath(const char * file) 61 { 62 static char pathbuf[MAXPATHLEN]; 63 64 snprintf(pathbuf, sizeof pathbuf, "%s/%s", grpath, file); 65 return pathbuf; 66 } 67 68 int 69 grdb(char *arg,...) 70 { 71 /* 72 * This is a stub for now, but maybe eventually be functional 73 * if ever an indexed version of /etc/groups is implemented. 74 */ 75 arg=arg; 76 return 0; 77 } 78 79 int 80 fmtgrentry(char **buf, int * buflen, struct group * grp, int type) 81 { 82 int i, l; 83 84 /* 85 * Since a group line is of arbitrary length, 86 * we need to calculate up-front just how long 87 * it will need to be... 88 */ 89 /* groupname : password : gid : */ 90 l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1; 91 /* group members + comma separator */ 92 for (i = 0; grp->gr_mem[i] != NULL; i++) { 93 l += strlen(grp->gr_mem[i]) + 1; 94 } 95 l += 2; /* For newline & NUL */ 96 if (extendline(buf, buflen, l) == -1) 97 l = -1; 98 else{ 99 /* 100 * Now we can safely format 101 */ 102 if (type == PWF_STANDARD) 103 l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid); 104 else 105 l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid); 106 107 /* 108 * List members 109 */ 110 for (i = 0; grp->gr_mem[i] != NULL; i++) { 111 l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]); 112 } 113 114 (*buf)[l++] = '\n'; 115 (*buf)[l] = '\0'; 116 } 117 return l; 118 } 119 120 121 int 122 fmtgrent(char **buf, int * buflen, struct group * grp) 123 { 124 return fmtgrentry(buf, buflen, grp, PWF_STANDARD); 125 } 126 127 128 static int 129 gr_update(struct group * grp, char const * group, int mode) 130 { 131 int l; 132 char pfx[64]; 133 int grbuflen = 0; 134 char *grbuf = NULL; 135 136 ENDGRENT(); 137 l = snprintf(pfx, sizeof pfx, "%s:", group); 138 139 /* 140 * Update the group file 141 */ 142 if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1) 143 l = -1; 144 else { 145 l = fileupdate(getgrpath(_GROUP), 0644, grbuf, pfx, l, mode); 146 if (l == 0) 147 l = grdb(NULL); 148 } 149 if (grbuf != NULL) 150 free(grbuf); 151 return l; 152 } 153 154 155 int 156 addgrent(struct group * grp) 157 { 158 return gr_update(grp, grp->gr_name, UPD_CREATE); 159 } 160 161 int 162 chggrent(char const * login, struct group * grp) 163 { 164 return gr_update(grp, login, UPD_REPLACE); 165 } 166 167 int 168 delgrent(struct group * grp) 169 { 170 return gr_update(NULL, grp->gr_name, UPD_DELETE); 171 } 172