src/src/auths/get_data.c

   1 /* $Cambridge: exim/src/src/auths/get_data.c,v 1.5 2007/01/08 10:50:19 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2007 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10 #include "../exim.h"
  11
  12
  13 /*************************************************
  14 *      Issue a challenge and get a response      *
  15 *************************************************/
  16
  17 /* This function is used by authentication drivers to output a challenge
  18 to the SMTP client and read the response line.
  19
  20 Arguments:
  21    aptr       set to point to the response (which is in big_buffer)
  22    challenge  the challenge text (unencoded, may be binary)
  23    challen    the length of the challenge text
  24
  25 Returns:      OK on success
  26               BAD64 if response too large for buffer
  27               CANCELLED if response is "*"
  28 */
  29
  30 int
  31 auth_get_data(uschar **aptr, uschar *challenge, int challen)
  32 {
  33 int c;
  34 int p = 0;
  35 smtp_printf("334 %s\r\n", auth_b64encode(challenge, challen));
  36 while ((c = receive_getc()) != '\n' && c != EOF)
  37   {
  38   if (p >= big_buffer_size - 1) return BAD64;
  39   big_buffer[p++] = c;
  40   }
  41 if (p > 0 && big_buffer[p-1] == '\r') p--;
  42 big_buffer[p] = 0;
  43 DEBUG(D_receive) debug_printf("SMTP<< %s\n", big_buffer);
  44 if (Ustrcmp(big_buffer, "*") == 0) return CANCELLED;
  45 *aptr = big_buffer;
  46 return OK;
  47 }
  48
  49 /* End of get_data.c */