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 <string.h>
  21
  22 #include "nls.h"
  23 #include "pathnames.h"
  24
  25 #define MAX_LENGTH      1024
  26
  27 int
  28 is_local(char *user)
  29 {
  30         FILE *fd;
  31         char line[MAX_LENGTH];
  32         int local = 0;
  33         int len;
  34
  35         if(!(fd = fopen(_PATH_PASSWD, "r"))) {
  36                 fprintf(stderr,_("Can't read %s, exiting."),_PATH_PASSWD);
  37                 exit(1);
  38         }
  39
  40         len = strlen(user);
  41         while(fgets(line, MAX_LENGTH, fd) > 0) {
  42                 if(!strncmp(line, user, len) && line[len] == ':') {
  43                         local = 1;
  44                         break;
  45                 }
  46         }
  47         fclose(fd);
  48         return local;
  49 }
  50