sys/src/libauthsrv/_asrdresp.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <authsrv.h>
   4
   5 static char *pbmsg = "AS protocol botch";
   6
   7 int
   8 _asrdresp(int fd, char *buf, int len)
   9 {
  10         int n;
  11         char error[64];
  12
  13         if(read(fd, buf, 1) != 1){
  14                 werrstr(pbmsg);
  15                 return -1;
  16         }
  17
  18         n = len;
  19         switch(buf[0]){
  20         case AuthOK:
  21                 if(readn(fd, buf, len) != len){
  22                         werrstr(pbmsg);
  23                         return -1;
  24                 }
  25                 break;
  26         case AuthErr:
  27                 if(readn(fd, error, sizeof error) != sizeof error){
  28                         werrstr(pbmsg);
  29                         return -1;
  30                 }
  31                 error[sizeof error-1] = '\0';
  32                 werrstr("remote: %s", error);
  33                 return -1;
  34         case AuthOKvar:
  35                 if(readn(fd, error, 5) != 5){
  36                         werrstr(pbmsg);
  37                         return -1;
  38                 }
  39                 error[5] = 0;
  40                 n = atoi(error);
  41                 if(n <= 0 || n > len){
  42                         werrstr(pbmsg);
  43                         return -1;
  44                 }
  45                 memset(buf, 0, len);
  46                 if(readn(fd, buf, n) != n){
  47                         werrstr(pbmsg);
  48                         return -1;
  49                 }
  50                 break;
  51         default:
  52                 werrstr(pbmsg);
  53                 return -1;
  54         }
  55         return n;
  56 }