pop3: Moved the calculation of SASL login details into a separate function

lib/pop3.c

@@ -106,6 +106,10 @@ static CURLcode pop3_setup_connection(struct connectdata *conn);
 static CURLcode pop3_parse_url_options(struct connectdata *conn);
 static CURLcode pop3_parse_url_path(struct connectdata *conn);
 static CURLcode pop3_parse_custom_request(struct connectdata *conn);
+static CURLcode pop3_calc_sasl_details(struct connectdata *conn,
+                                       const char **mech,
+                                       char **initresp, size_t *len,
+                                       pop3state *state1, pop3state *state2);
 
 /*
  * POP3 protocol handler.
@@ -616,7 +620,6 @@ static CURLcode pop3_perform_auth(struct connectdata *conn,
 static CURLcode pop3_perform_authentication(struct connectdata *conn)
 {
   CURLcode result = CURLE_OK;
-  struct SessionHandle *data = conn->data;
   struct pop3_conn *pop3c = &conn->proto.pop3c;
   const char *mech = NULL;
   char *initresp = NULL;
@@ -632,76 +635,10 @@ static CURLcode pop3_perform_authentication(struct connectdata *conn)
     return result;
   }
 
-  /* Calculate the supported authentication mechanism, by decreasing order of
+  /* Calculate the SASL login details */
-     security, as well as the initial response where appropriate */
+  if(pop3c->authtypes & POP3_TYPE_SASL)
-  if(pop3c->authtypes & POP3_TYPE_SASL) {
+    result = pop3_calc_sasl_details(conn, &mech, &initresp, &len, &state1,
-#ifndef CURL_DISABLE_CRYPTO_AUTH
+                                    &state2);
-    if((pop3c->authmechs & SASL_MECH_DIGEST_MD5) &&
-       (pop3c->prefmech & SASL_MECH_DIGEST_MD5)) {
-      mech = SASL_MECH_STRING_DIGEST_MD5;
-      state1 = POP3_AUTH_DIGESTMD5;
-      pop3c->authused = SASL_MECH_DIGEST_MD5;
-    }
-    else if((pop3c->authmechs & SASL_MECH_CRAM_MD5) &&
-            (pop3c->prefmech & SASL_MECH_CRAM_MD5)) {
-      mech = SASL_MECH_STRING_CRAM_MD5;
-      state1 = POP3_AUTH_CRAMMD5;
-      pop3c->authused = SASL_MECH_CRAM_MD5;
-    }
-    else
-#endif
-#ifdef USE_NTLM
-    if((pop3c->authmechs & SASL_MECH_NTLM) &&
-       (pop3c->prefmech & SASL_MECH_NTLM)) {
-      mech = SASL_MECH_STRING_NTLM;
-      state1 = POP3_AUTH_NTLM;
-      state2 = POP3_AUTH_NTLM_TYPE2MSG;
-      pop3c->authused = SASL_MECH_NTLM;
-
-      if(data->set.sasl_ir)
-        result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd,
-                                                     &conn->ntlm,
-                                                     &initresp, &len);
-    }
-    else
-#endif
-    if(((pop3c->authmechs & SASL_MECH_XOAUTH2) &&
-        (pop3c->prefmech & SASL_MECH_XOAUTH2) &&
-        (pop3c->prefmech != SASL_AUTH_ANY)) || conn->xoauth2_bearer) {
-      mech = SASL_MECH_STRING_XOAUTH2;
-      state1 = POP3_AUTH_XOAUTH2;
-      state2 = POP3_AUTH_FINAL;
-      pop3c->authused = SASL_MECH_XOAUTH2;
-
-      if(data->set.sasl_ir)
-        result = Curl_sasl_create_xoauth2_message(conn->data, conn->user,
-                                                  conn->xoauth2_bearer,
-                                                  &initresp, &len);
-    }
-    else if((pop3c->authmechs & SASL_MECH_LOGIN) &&
-       (pop3c->prefmech & SASL_MECH_LOGIN)) {
-      mech = SASL_MECH_STRING_LOGIN;
-      state1 = POP3_AUTH_LOGIN;
-      state2 = POP3_AUTH_LOGIN_PASSWD;
-      pop3c->authused = SASL_MECH_LOGIN;
-
-      if(data->set.sasl_ir)
-        result = Curl_sasl_create_login_message(conn->data, conn->user,
-                                                &initresp, &len);
-    }
-    else if((pop3c->authmechs & SASL_MECH_PLAIN) &&
-            (pop3c->prefmech & SASL_MECH_PLAIN)) {
-      mech = SASL_MECH_STRING_PLAIN;
-      state1 = POP3_AUTH_PLAIN;
-      state2 = POP3_AUTH_FINAL;
-      pop3c->authused = SASL_MECH_PLAIN;
-
-      if(data->set.sasl_ir)
-        result = Curl_sasl_create_plain_message(conn->data, conn->user,
-                                                conn->passwd, &initresp,
-                                                &len);
-    }
-  }
 
   if(!result) {
     if(mech && (pop3c->preftype & POP3_TYPE_SASL)) {
@@ -1938,6 +1875,91 @@ static CURLcode pop3_parse_custom_request(struct connectdata *conn)
   return result;
 }
 
+/***********************************************************************
+ *
+ * pop3_calc_sasl_details()
+ *
+ * Calculate the required login details for SASL authentication.
+ */
+static CURLcode pop3_calc_sasl_details(struct connectdata *conn,
+                                       const char **mech,
+                                       char **initresp, size_t *len,
+                                       pop3state *state1, pop3state *state2)
+{
+  CURLcode result = CURLE_OK;
+  struct SessionHandle *data = conn->data;
+  struct pop3_conn *pop3c = &conn->proto.pop3c;
+
+  /* Calculate the supported authentication mechanism, by decreasing order of
+     security, as well as the initial response where appropriate */
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+  if((pop3c->authmechs & SASL_MECH_DIGEST_MD5) &&
+      (pop3c->prefmech & SASL_MECH_DIGEST_MD5)) {
+    *mech = SASL_MECH_STRING_DIGEST_MD5;
+    *state1 = POP3_AUTH_DIGESTMD5;
+    pop3c->authused = SASL_MECH_DIGEST_MD5;
+  }
+  else if((pop3c->authmechs & SASL_MECH_CRAM_MD5) &&
+          (pop3c->prefmech & SASL_MECH_CRAM_MD5)) {
+    *mech = SASL_MECH_STRING_CRAM_MD5;
+    *state1 = POP3_AUTH_CRAMMD5;
+    pop3c->authused = SASL_MECH_CRAM_MD5;
+  }
+  else
+#endif
+#ifdef USE_NTLM
+  if((pop3c->authmechs & SASL_MECH_NTLM) &&
+      (pop3c->prefmech & SASL_MECH_NTLM)) {
+    *mech = SASL_MECH_STRING_NTLM;
+    *state1 = POP3_AUTH_NTLM;
+    *state2 = POP3_AUTH_NTLM_TYPE2MSG;
+    pop3c->authused = SASL_MECH_NTLM;
+
+    if(data->set.sasl_ir)
+      result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd,
+                                                    &conn->ntlm,
+                                                    initresp, len);
+  }
+  else
+#endif
+  if(((pop3c->authmechs & SASL_MECH_XOAUTH2) &&
+      (pop3c->prefmech & SASL_MECH_XOAUTH2) &&
+      (pop3c->prefmech != SASL_AUTH_ANY)) || conn->xoauth2_bearer) {
+    *mech = SASL_MECH_STRING_XOAUTH2;
+    *state1 = POP3_AUTH_XOAUTH2;
+    *state2 = POP3_AUTH_FINAL;
+    pop3c->authused = SASL_MECH_XOAUTH2;
+
+    if(data->set.sasl_ir)
+      result = Curl_sasl_create_xoauth2_message(data, conn->user,
+                                                conn->xoauth2_bearer,
+                                                initresp, len);
+  }
+  else if((pop3c->authmechs & SASL_MECH_LOGIN) &&
+          (pop3c->prefmech & SASL_MECH_LOGIN)) {
+    *mech = SASL_MECH_STRING_LOGIN;
+    *state1 = POP3_AUTH_LOGIN;
+    *state2 = POP3_AUTH_LOGIN_PASSWD;
+    pop3c->authused = SASL_MECH_LOGIN;
+
+    if(data->set.sasl_ir)
+      result = Curl_sasl_create_login_message(data, conn->user, initresp, len);
+  }
+  else if((pop3c->authmechs & SASL_MECH_PLAIN) &&
+          (pop3c->prefmech & SASL_MECH_PLAIN)) {
+    *mech = SASL_MECH_STRING_PLAIN;
+    *state1 = POP3_AUTH_PLAIN;
+    *state2 = POP3_AUTH_FINAL;
+    pop3c->authused = SASL_MECH_PLAIN;
+
+    if(data->set.sasl_ir)
+      result = Curl_sasl_create_plain_message(data, conn->user, conn->passwd,
+                                              initresp, len);
+  }
+
+  return result;
+}
+
 /***********************************************************************
  *
  * Curl_pop3_write()