login-utils/islocal.c

   1 /*
   2    islocal.c - returns true if user is registered in the local
   3    /etc/passwd file. Written by Alvaro Martinez Echevarria,
   4    alvaro@enano.etsit.upm.es, to allow peaceful coexistence with yp. Nov 94.
   5
   6    Hacked a bit by poe@daimi.aau.dk
   7    See also ftp://ftp.daimi.aau.dk/pub/linux/poe/admutil*
   8
   9    Hacked by Peter Breitenlohner, peb@mppmu.mpg.de,
  10      to distinguish user names where one is a prefix of the other,
  11      and to use "pathnames.h". Oct 5, 96.
  12
  13    1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
  14    - added Native Language Support
  15
  16
  17 */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "nls.h"
  24 #include "pathnames.h"
  25 #include "islocal.h"
  26
  27 #define MAX_LENGTH      1024
  28
  29 int
  30 is_local(char *user)
  31 {
  32         FILE *fd;
  33         char line[MAX_LENGTH];
  34         int local = 0;
  35         int len;
  36
  37         if(!(fd = fopen(_PATH_PASSWD, "r"))) {
  38                 fprintf(stderr,_("Can't read %s, exiting."),_PATH_PASSWD);
  39                 exit(1);
  40         }
  41
  42         len = strlen(user);
  43         while(fgets(line, MAX_LENGTH, fd) > 0) {
  44                 if(!strncmp(line, user, len) && line[len] == ':') {
  45                         local = 1;
  46                         break;
  47                 }
  48         }
  49         fclose(fd);
  50         return local;
  51 }
  52