pw/pw_vpw.c

   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
  28 #ifndef lint
  29 static const char rcsid[] =
  30   "$FreeBSD$";
  31 #endif /* not lint */
  32
  33 #include <pwd.h>
  34 #include <grp.h>
  35 #include <libutil.h>
  36 #define _WITH_GETLINE
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <stdlib.h>
  40 #include <err.h>
  41
  42 #include "pwupd.h"
  43
  44 static FILE * pwd_fp = NULL;
  45
  46 void
  47 vendpwent(void)
  48 {
  49         if (pwd_fp != NULL) {
  50                 fclose(pwd_fp);
  51                 pwd_fp = NULL;
  52         }
  53 }
  54
  55 void
  56 vsetpwent(void)
  57 {
  58         vendpwent();
  59 }
  60
  61 static struct passwd *
  62 vnextpwent(char const *nam, uid_t uid, int doclose)
  63 {
  64         struct passwd *pw;
  65         char *line;
  66         size_t linecap;
  67         ssize_t linelen;
  68
  69         pw = NULL;
  70         line = NULL;
  71         linecap = 0;
  72
  73         if (pwd_fp != NULL || (pwd_fp = fopen(getpwpath(_MASTERPASSWD), "r")) != NULL) {
  74                 while ((linelen = getline(&line, &linecap, pwd_fp)) > 0) {
  75                         /* Skip comments and empty lines */
  76                         if (*line == '\n' || *line == '#')
  77                                 continue;
  78                         /* trim latest \n */
  79                         if (line[linelen - 1 ] == '\n')
  80                                 line[linelen - 1] = '\0';
  81                         pw = pw_scan(line, PWSCAN_MASTER);
  82                         if (pw == NULL)
  83                                 errx(EXIT_FAILURE, "Invalid user entry in '%s':"
  84                                     " '%s'", getpwpath(_MASTERPASSWD), line);
  85                         if (uid != (uid_t)-1) {
  86                                 if (uid == pw->pw_uid)
  87                                         break;
  88                         } else if (nam != NULL) {
  89                                 if (strcmp(nam, pw->pw_name) == 0)
  90                                         break;
  91                         } else
  92                                 break;
  93                         free(pw);
  94                         pw = NULL;
  95                 }
  96                 if (doclose)
  97                         vendpwent();
  98         }
  99         free(line);
 100
 101         return (pw);
 102 }
 103
 104 struct passwd *
 105 vgetpwent(void)
 106 {
 107   return vnextpwent(NULL, -1, 0);
 108 }
 109
 110 struct passwd *
 111 vgetpwuid(uid_t uid)
 112 {
 113   return vnextpwent(NULL, uid, 1);
 114 }
 115
 116 struct passwd *
 117 vgetpwnam(const char * nam)
 118 {
 119   return vnextpwent(nam, -1, 1);
 120 }
 121
 122
 123 static FILE * grp_fp = NULL;
 124
 125 void
 126 vendgrent(void)
 127 {
 128         if (grp_fp != NULL) {
 129                 fclose(grp_fp);
 130                 grp_fp = NULL;
 131         }
 132 }
 133
 134 RET_SETGRENT
 135 vsetgrent(void)
 136 {
 137         vendgrent();
 138 #if defined(__FreeBSD__)
 139         return 0;
 140 #endif
 141 }
 142
 143 static struct group *
 144 vnextgrent(char const *nam, gid_t gid, int doclose)
 145 {
 146         struct group *gr;
 147         char *line;
 148         size_t linecap;
 149         ssize_t linelen;
 150
 151         gr = NULL;
 152         line = NULL;
 153         linecap = 0;
 154
 155         if (grp_fp != NULL || (grp_fp = fopen(getgrpath(_GROUP), "r")) != NULL) {
 156                 while ((linelen = getline(&line, &linecap, grp_fp)) > 0) {
 157                         /* Skip comments and empty lines */
 158                         if (*line == '\n' || *line == '#')
 159                                 continue;
 160                         /* trim latest \n */
 161                         if (line[linelen - 1 ] == '\n')
 162                                 line[linelen - 1] = '\0';
 163                         gr = gr_scan(line);
 164                         if (gr == NULL)
 165                                 errx(EXIT_FAILURE, "Invalid group entry in '%s':"
 166                                     " '%s'", getgrpath(_GROUP), line);
 167                         if (gid != (gid_t)-1) {
 168                                 if (gid == gr->gr_gid)
 169                                         break;
 170                         } else if (nam != NULL) {
 171                                 if (strcmp(nam, gr->gr_name) == 0)
 172                                         break;
 173                         } else
 174                                 break;
 175                         free(gr);
 176                         gr = NULL;
 177                 }
 178                 if (doclose)
 179                         vendgrent();
 180         }
 181         free(line);
 182
 183         return (gr);
 184 }
 185
 186 struct group *
 187 vgetgrent(void)
 188 {
 189   return vnextgrent(NULL, -1, 0);
 190 }
 191
 192
 193 struct group *
 194 vgetgrgid(gid_t gid)
 195 {
 196   return vnextgrent(NULL, gid, 1);
 197 }
 198
 199 struct group *
 200 vgetgrnam(const char * nam)
 201 {
 202   return vnextgrent(nam, -1, 1);
 203 }
 204