src/getpwuidandroid.cc

   1 ///
   2 /// \file       getpwuidandroid.cc
   3 ///             Replacements for getpwuid*() calls on Android
   4 ///
   5
   6 /*
   7     Copyright (C) 2011, RealVNC Ltd.
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17
  18     See the GNU General Public License in the COPYING file at the
  19     root directory of this project for more details.
  20 */
  21
  22 #include "getpwuid.h"
  23
  24 #include <string.h>
  25 #include <errno.h>
  26
  27 #define SDCARD_PATH "/mnt/sdcard"
  28
  29 static void fillInData(uid_t uid, char* emptyString, char* sdcardPath, struct barry_passwd* pwd)
  30 {
  31         pwd->pw_name = emptyString;
  32         pwd->pw_passwd = emptyString;
  33         pwd->pw_uid = uid;
  34         pwd->pw_gid = 0;
  35         pwd->pw_gecos = emptyString;
  36         // This is the important value for Barry, as it's where to store
  37         // config files.
  38         //
  39         // For Android the best place is probably on the sdcard, as then
  40         // it doesn't matter which application is calling it, as long
  41         // as it has android.permission.WRITE_EXTERNAL_STORAGE
  42         pwd->pw_dir = sdcardPath;
  43         pwd->pw_shell = emptyString;
  44 }
  45
  46 extern "C" struct barry_passwd *barry_getpwuid(uid_t uid)
  47 {
  48         static char emptyString[1] = {0};
  49         static char sdcardString[sizeof(SDCARD_PATH)] = SDCARD_PATH;
  50         static struct barry_passwd gPasswdStruct;
  51         fillInData(uid, emptyString, sdcardString, &gPasswdStruct);
  52         return &gPasswdStruct;
  53 }
  54
  55 extern "C" int barry_getpwuid_r(uid_t uid, struct barry_passwd *pwd,
  56                    char *buf, size_t buflen, struct barry_passwd **result)
  57 {
  58         if (buflen < sizeof(SDCARD_PATH))
  59                 return ERANGE;
  60         memcpy(buf, SDCARD_PATH, sizeof(SDCARD_PATH));
  61         // Point all the empty entries at the '\0' at the end of the buffer
  62         fillInData(uid, buf + sizeof(SDCARD_PATH) - 1, buf, pwd);
  63         *result = pwd;
  64         return 0;
  65 }