Use retval from sprintf while walking buffers

[exim.git] / src / src / auths / cram_md5.c

diff --git a/src/src/auths/cram_md5.c b/src/src/auths/cram_md5.c
index f744a89eacc2a31752e5a37295f6484dbc1c0a10..04d893c97207ac810f28ad26fe16d7c3d391a45e 100644 (file)
--- a/src/src/auths/cram_md5.c
+++ b/src/src/auths/cram_md5.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2012 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -38,7 +38,7 @@ address can appear in the tables drtables.c. */
 int auth_cram_md5_options_count =
   sizeof(auth_cram_md5_options)/sizeof(optionlist);
 
-/* Default private options block for the contidion authentication method. */
+/* Default private options block for the condition authentication method. */
 
 auth_cram_md5_options_block auth_cram_md5_option_defaults = {
   NULL,             /* server_secret */
@@ -47,6 +47,17 @@ auth_cram_md5_options_block auth_cram_md5_option_defaults = {
 };
 
 
+#ifdef MACRO_PREDEF
+
+/* Dummy values */
+void auth_cram_md5_init(auth_instance *ablock) {}
+int auth_cram_md5_server(auth_instance *ablock, uschar *data) {return 0;}
+int auth_cram_md5_client(auth_instance *ablock, smtp_inblock *inblock,
+  smtp_outblock *outblock, int timeout, uschar *buffer, int buffsize) {return 0;}
+
+#else  /*!MACRO_PREDEF*/
+
+
 /*************************************************
 *          Initialization entry point            *
 *************************************************/
@@ -68,12 +79,14 @@ if (ob->client_secret != NULL)
   }
 }
 
+#endif /*!MACRO_PREDEF*/
 #endif  /* STAND_ALONE */
 
 
 
+#ifndef MACRO_PREDEF
 /*************************************************
-*      Peform the CRAM-MD5 algorithm             *
+*      Perform the CRAM-MD5 algorithm            *
 *************************************************/
 
 /* The CRAM-MD5 algorithm is described in RFC 2195. It computes
@@ -172,7 +185,7 @@ if (*data != 0) return UNEXPECTED;
 /* Send the challenge, read the return */
 
 if ((rc = auth_get_data(&data, challenge, Ustrlen(challenge))) != OK) return rc;
-if ((len = auth_b64decode(data, &clear)) < 0) return BAD64;
+if ((len = b64decode(data, &clear)) < 0) return BAD64;
 
 /* The return consists of a user name, space-separated from the CRAM-MD5
 digest, expressed in hex. Extract the user name and put it in $auth1 and $1.
@@ -261,9 +274,9 @@ int i;
 uschar digest[16];
 
 /* If expansion of either the secret or the user name failed, return CANCELLED
-or ERROR, as approriate. */
+or ERROR, as appropriate. */
 
-if (secret == NULL || name == NULL)
+if (!secret || !name)
   {
   if (expand_string_forcedfail)
     {
@@ -272,7 +285,7 @@ if (secret == NULL || name == NULL)
     }
   string_format(buffer, buffsize, "expansion of \"%s\" failed in "
     "%s authenticator: %s",
-    (secret == NULL)? ob->client_secret : ob->client_name,
+    !secret ? ob->client_secret : ob->client_name,
     ablock->name, expand_string_message);
   return ERROR;
   }
@@ -280,12 +293,13 @@ if (secret == NULL || name == NULL)
 /* Initiate the authentication exchange and read the challenge, which arrives
 in base 64. */
 
-if (smtp_write_command(outblock, FALSE, "AUTH %s\r\n", ablock->public_name) < 0)
+if (smtp_write_command(outblock, SCMD_FLUSH, "AUTH %s\r\n",
+                       ablock->public_name) < 0)
   return FAIL_SEND;
-if (smtp_read_response(inblock, (uschar *)buffer, buffsize, '3', timeout) < 0)
+if (!smtp_read_response(inblock, buffer, buffsize, '3', timeout))
   return FAIL;
 
-if (auth_b64decode(buffer + 4, &challenge) < 0)
+if (b64decode(buffer + 4, &challenge) < 0)
   {
   string_format(buffer, buffsize, "bad base 64 string in challenge: %s",
     big_buffer + 4);
@@ -299,26 +313,22 @@ compute_cram_md5(secret, challenge, digest);
 /* Create the response from the user name plus the CRAM-MD5 digest */
 
 string_format(big_buffer, big_buffer_size - 36, "%s", name);
-p = big_buffer;
-while (*p != 0) p++;
+for (p = big_buffer; *p; ) p++;
 *p++ = ' ';
 
 for (i = 0; i < 16; i++)
-  {
-  sprintf(CS p, "%02x", digest[i]);
-  p += 2;
-  }
+  p += sprintf(CS p, "%02x", digest[i]);
 
 /* Send the response, in base 64, and check the result. The response is
-in big_buffer, but auth_b64encode() returns its result in working store,
+in big_buffer, but b64encode() returns its result in working store,
 so calling smtp_write_command(), which uses big_buffer, is OK. */
 
 buffer[0] = 0;
-if (smtp_write_command(outblock, FALSE, "%s\r\n", auth_b64encode(big_buffer,
+if (smtp_write_command(outblock, SCMD_FLUSH, "%s\r\n", b64encode(big_buffer,
   p - big_buffer)) < 0) return FAIL_SEND;
 
-return smtp_read_response(inblock, (uschar *)buffer, buffsize, '2', timeout)?
-  OK : FAIL;
+return smtp_read_response(inblock, (uschar *)buffer, buffsize, '2', timeout)
+  ? OK : FAIL;
 }
 #endif  /* STAND_ALONE */
 
@@ -348,4 +358,5 @@ return 0;
 
 #endif
 
+#endif /*!MACRO_PREDEF*/
 /* End of cram_md5.c */