apps/login/login.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <sys/wait.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <limits.h>
  23 #include <misc.h>
  24 #include <pwd.h>
  25
  26 /// @todo this should be "/bin/sh" (when symlinks work)
  27 #define DEFAULT_SHELL "/boot/bin/sh"
  28
  29 #ifdef LOGIN
  30 FILE *console;
  31
  32 int init_input() {
  33   console = fopen("/dev/console","rw");
  34   return console!=NULL?0:-1;
  35 }
  36
  37 char *input(int hide) {
  38   static char buf[LOGIN_NAME_MAX];
  39   int i = 0;
  40   for (i=0;i<LOGIN_NAME_MAX-1 && (buf[i] = fgetc(console))!='\n';i++) fputc(hide?'*':buf[i],console);
  41   fputc('\n',console);
  42   buf[i] = 0;
  43   return buf;
  44 }
  45
  46 char *login() {
  47   char *user;
  48   //char *pass;
  49   struct passwd *passwd;
  50
  51   do {
  52     fputs("User: ",console);
  53     fflush(stdout);
  54     user = input(0);
  55     passwd = getpwnam(user);
  56     if (passwd==NULL) {
  57       fputs("User does not exist.\n",console);
  58       break;
  59     }
  60     /// @todo Check password
  61     /*fputs("Password: ",console);
  62     fflush(stdout);
  63     pass = input(1);*/
  64   } while (0);
  65
  66   setreuid(passwd->pw_uid);
  67   setregid(passwd->pw_gid);
  68   chdir(passwd->pw_dir);
  69   return passwd->pw_shell;
  70 }
  71 #endif
  72
  73 void shell_run(char *shell) {
  74   pid_t pid = execute(shell,NULL,NULL,NULL,NULL);
  75   waitpid(pid,NULL,0);
  76 }
  77
  78 int main(int argc,char *argv[]) {
  79 #ifdef LOGIN
  80   if (init_input()==-1) abort();
  81   while (1) shell_run(login());
  82 #else
  83   shell_run(DEFAULT_SHELL);
  84 #endif
  85   printf("TODO %s:%d: Run shutdown\n",__FILE__,__LINE__);
  86   while (1);
  87   return 0;
  88 }