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 <sys/param.h>
  41 #include <err.h>
  42
  43 #include "pwupd.h"
  44
  45 static FILE * pwd_fp = NULL;
  46
  47 void
  48 vendpwent(void)
  49 {
  50         if (pwd_fp != NULL) {
  51                 fclose(pwd_fp);
  52                 pwd_fp = NULL;
  53         }
  54 }
  55
  56 void
  57 vsetpwent(void)
  58 {
  59         vendpwent();
  60 }
  61
  62 static struct passwd *
  63 vnextpwent(char const *nam, uid_t uid, int doclose)
  64 {
  65         struct passwd *pw;
  66         char *line;
  67         size_t linecap;
  68         ssize_t linelen;
  69
  70         pw = NULL;
  71         line = NULL;
  72         linecap = 0;
  73         linelen = 0;
  74
  75         if (pwd_fp != NULL || (pwd_fp = fopen(getpwpath(_MASTERPASSWD), "r")) != NULL) {
  76                 while ((linelen = getline(&line, &linecap, pwd_fp)) > 0) {
  77                         /* Skip comments and empty lines */
  78                         if (*line == '\n' || *line == '#')
  79                                 continue;
  80                         /* trim latest \n */
  81                         if (line[linelen - 1 ] == '\n')
  82                                 line[linelen - 1] = '\0';
  83                         pw = pw_scan(line, PWSCAN_MASTER);
  84                         if (pw == NULL)
  85                                 errx(EXIT_FAILURE, "Invalid user entry in '%s':"
  86                                     " '%s'", getpwpath(_MASTERPASSWD), line);
  87                         if (uid != (uid_t)-1) {
  88                                 if (uid == pw->pw_uid)
  89                                         break;
  90                         } else if (nam != NULL) {
  91                                 if (strcmp(nam, pw->pw_name) == 0)
  92                                         break;
  93                         } else
  94                                 break;
  95                         free(pw);
  96                         pw = NULL;
  97                 }
  98                 if (doclose)
  99                         vendpwent();
 100         }
 101         free(line);
 102
 103         return (pw);
 104 }
 105
 106 struct passwd *
 107 vgetpwent(void)
 108 {
 109   return vnextpwent(NULL, -1, 0);
 110 }
 111
 112 struct passwd *
 113 vgetpwuid(uid_t uid)
 114 {
 115   return vnextpwent(NULL, uid, 1);
 116 }
 117
 118 struct passwd *
 119 vgetpwnam(const char * nam)
 120 {
 121   return vnextpwent(nam, -1, 1);
 122 }
 123
 124
 125 static FILE * grp_fp = NULL;
 126
 127 void
 128 vendgrent(void)
 129 {
 130         if (grp_fp != NULL) {
 131                 fclose(grp_fp);
 132                 grp_fp = NULL;
 133         }
 134 }
 135
 136 RET_SETGRENT
 137 vsetgrent(void)
 138 {
 139         vendgrent();
 140 #if defined(__FreeBSD__)
 141         return 0;
 142 #endif
 143 }
 144
 145 static struct group *
 146 vnextgrent(char const *nam, gid_t gid, int doclose)
 147 {
 148         struct group *gr;
 149         char *line;
 150         size_t linecap;
 151         ssize_t linelen;
 152
 153         gr = NULL;
 154         line = NULL;
 155         linecap = 0;
 156         linelen = 0;
 157
 158         if (grp_fp != NULL || (grp_fp = fopen(getgrpath(_GROUP), "r")) != NULL) {
 159                 while ((linelen = getline(&line, &linecap, grp_fp)) > 0) {
 160                         /* Skip comments and empty lines */
 161                         if (*line == '\n' || *line == '#')
 162                                 continue;
 163                         /* trim latest \n */
 164                         if (line[linelen - 1 ] == '\n')
 165                                 line[linelen - 1] = '\0';
 166                         gr = gr_scan(line);
 167                         if (gr == NULL)
 168                                 errx(EXIT_FAILURE, "Invalid group entry in '%s':"
 169                                     " '%s'", getgrpath(_GROUP), line);
 170                         if (gid != (gid_t)-1) {
 171                                 if (gid == gr->gr_gid)
 172                                         break;
 173                         } else if (nam != NULL) {
 174                                 if (strcmp(nam, gr->gr_name) == 0)
 175                                         break;
 176                         } else
 177                                 break;
 178                         free(gr);
 179                         gr = NULL;
 180                 }
 181                 if (doclose)
 182                         vendgrent();
 183         }
 184         free(line);
 185
 186         return (gr);
 187 }
 188
 189 struct group *
 190 vgetgrent(void)
 191 {
 192   return vnextgrent(NULL, -1, 0);
 193 }
 194
 195
 196 struct group *
 197 vgetgrgid(gid_t gid)
 198 {
 199   return vnextgrent(NULL, gid, 1);
 200 }
 201
 202 struct group *
 203 vgetgrnam(const char * nam)
 204 {
 205   return vnextgrent(nam, -1, 1);
 206 }
 207