src/src/auths/get_data.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 #include "../exim.h"
   9
  10
  11 /*************************************************
  12 *      Issue a challenge and get a response      *
  13 *************************************************/
  14
  15 /* This function is used by authentication drivers to output a challenge
  16 to the SMTP client and read the response line.
  17
  18 Arguments:
  19    aptr       set to point to the response (which is in big_buffer)
  20    challenge  the challenge text (unencoded, may be binary)
  21    challen    the length of the challenge text
  22
  23 Returns:      OK on success
  24               BAD64 if response too large for buffer
  25               CANCELLED if response is "*"
  26 */
  27
  28 int
  29 auth_get_data(uschar **aptr, uschar *challenge, int challen)
  30 {
  31 int c;
  32 int p = 0;
  33 smtp_printf("334 %s\r\n", FALSE, b64encode(challenge, challen));
  34 while ((c = receive_getc(GETC_BUFFER_UNLIMITED)) != '\n' && c != EOF)
  35   {
  36   if (p >= big_buffer_size - 1) return BAD64;
  37   big_buffer[p++] = c;
  38   }
  39 if (p > 0 && big_buffer[p-1] == '\r') p--;
  40 big_buffer[p] = 0;
  41 DEBUG(D_receive) debug_printf("SMTP<< %s\n", big_buffer);
  42 if (Ustrcmp(big_buffer, "*") == 0) return CANCELLED;
  43 *aptr = big_buffer;
  44 return OK;
  45 }
  46
  47 /* End of get_data.c */