sys/src/cmd/9nfs/9auth.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <fcntl.h>
   4 #include <stdio.h>
   5
   6 #define NETCHLEN        16              /* max network challenge length */
   7
   8 char *  argv0;
   9 int     debug;
  10 int     delete;
  11
  12 char *  root = "/n/emelie";
  13 char *  user;
  14 char    file[64];
  15 char    challenge[NETCHLEN];
  16 char    response[NETCHLEN];
  17
  18 void
  19 usage(void)
  20 {
  21         printf("usage: %s [-d] username\n", argv0);
  22         exit(1);
  23 }
  24
  25 void
  26 main(int argc, char **argv)
  27 {
  28         int fd, n;
  29
  30         for(argv0=*argv++,--argc; argc>0; ++argv,--argc){
  31                 if(argv[0][0] != '-' || argv[0][1] == '-')
  32                         break;
  33                 switch(argv[0][1]){
  34                 case 'D':
  35                         ++debug;
  36                         break;
  37                 case 'd':
  38                         ++delete;
  39                         break;
  40                 case 'r':
  41                         root = argv[0][2] ? &argv[0][2] : (--argc, *++argv);
  42                         break;
  43                 default:
  44                         usage();
  45                         break;
  46                 }
  47         }
  48         if(argc != 1)
  49                 usage();
  50         user = argv[0];
  51         snprintf(file, sizeof file, "%s/#%s", root, user);
  52         if(debug)
  53                 printf("debug=%d, file=%s\n", debug, file);
  54         if(delete){
  55                 fd = creat(file, 0600);
  56                 if(fd < 0){
  57                         perror(file);
  58                         exit(1);
  59                 }
  60                 exit(0);
  61         }
  62         fd = open(file, 2);
  63         if(fd < 0){
  64                 perror(file);
  65                 exit(1);
  66         }
  67         n = read(fd, challenge, NETCHLEN);
  68         if(debug)
  69                 printf("read %d\n", n);
  70         if(n <= 0){
  71                 printf("read %d: ", n);
  72                 perror("");
  73                 exit(1);
  74         }
  75         printf("challenge: %s\n", challenge);
  76         write(1, "response: ", 10);
  77         read(0, response, NETCHLEN-1);
  78         lseek(fd, 0, 0);
  79         n = write(fd, response, NETCHLEN);
  80         if(debug)
  81                 printf("write %d\n", n);
  82         if(n <= 0){
  83                 printf("write %d: ", n);
  84                 perror("");
  85                 exit(1);
  86         }
  87         exit(0);
  88 }