diff --git a/bdisk/host.py b/bdisk/host.py
index 54812ad..ff32dc9 100755
--- a/bdisk/host.py
+++ b/bdisk/host.py
@@ -3,6 +3,7 @@ import sys
 import platform
 import re
 import configparser
+import validators
 from socket import getaddrinfo
 
 def getOS():
@@ -45,15 +46,10 @@ def getConfig(conf_file='/etc/bdisk/build.ini'):
     return(conf)
 
 def parseConfig(conf):
-    # The following are paths; c means create, e means must exist, ? means depends on other opts:
-    # build:basedir(e),build:archboot(c),build:isodir(c),build:mountpt(c),
-    #   build:srcdir(c),build:tempdir(c),http:path(c?),tftp:path(c?),rsync:path (remote, no op)
-    # The following are files: ipxe:ssl_ca(e?),ipxe:ssl_cakey(e?),ipxe:ssl_crt(e?),ipxe:key(c)
-    # The following are URIs: ipxe:uri
-    # The rest are strings.
     config = configparser.ConfigParser()
     config._interpolation = configparser.ExtendedInterpolation()
     config.read(conf)
+    # a dict makes this so much easier.
     config_dict = {s:dict(config.items(s)) for s in config.sections()}
     # Convert the booleans to pythonic booleans in the dict...
     config_dict['bdisk']['user'] = config['bdisk'].getboolean('user')
@@ -63,13 +59,52 @@ def parseConfig(conf):
         config_dict['sync'][i] = config['sync'].getboolean(i)
     config_dict['ipxe']['iso'] = config['ipxe'].getboolean('iso')
     config_dict['ipxe']['usb'] = config['ipxe'].getboolean('usb')
-    # Validate the rsync host. Works for IP address too. It does NOT
-    # check to see if we can actually *rsync* to it; that'll come later.
-    try:
-        getaddrinfo(config_dict['rsync']['host'], None)
-    except:
-        exit(('ERROR: {0} is not a valid host that can be used for rsyncing.' +
-                'Check your configuration.').format(config_dict['rsync']['host']))
+    ## VALIDATORS ##
+    # Are we rsyncing? If so, validate the rsync host.
+    # Works for IP address too. It does NOT check to see if we can
+    # actually *rsync* to it; that'll come later.
+    if config_dict['sync']['rsync']:
+        if (validators.domain(config_dict['rsync']['host']) or validators.ipv4(
+                                config_dict['rsync']['host']) or validators.ipv6(
+                                config_dict['rsync']['host'])):
+            try:
+                getaddrinfo(config_dict['rsync']['host'], None)
+            except:
+                exit(('ERROR: {0} does not resolve and cannot be used for rsyncing.' +
+                    'Check your configuration.').format(config_dict['rsync']['host']))
+        else:
+            exit(('ERROR: {0} is not a valid host and cannot be used for rsyncing.' +
+                    'Check your configuration.').format(config_dict['rsync']['host']))
     # Validate the URI.
+    if config_dict['sync']['ipxe']:
+        # so this won't validate e.g. custom LAN domains (https://pxeserver/bdisk.php). TODO.
+        if not validators.url(config_dict['ipxe']['uri']):
+            if not re.match('^https?://localhost(/.*)?$'):
+                exit('ERROR: {0} is not a valid URL/URI. Check your configuration.'.format(
+                        config_dict['ipxe']['uri']))
+    # Validate required paths
+    if not os.path.exists(config_dict['build']['basedir'] + '/extra'):
+        exit(("ERROR: {0} does not contain BDisk's core files!" + 
+                "Check your configuration.").format(config_dict['build']['basedir']))
+    # Make dirs if they don't exist
+    for d in ('archboot', 'isodir', 'mountpt', 'srcdir', 'tempdir'):
+        os.makedirs(config_dict['build'][d], exists_ok = True)
+    # Make dirs for sync staging if we need to
+    for x in ('http', 'tftp'):
+        if config_dict['sync'][x]:
+            os.makedirs(config_dict[x]['path'], exist_ok = True)
+    # Hoo boy. Now we test paths for SSL in iPXE...
+    if config_dict['build']['ipxe']:
+        if config_dict['ipxe']['ssl_crt']:
+            for x in ('ssl_key', 'ssl_cakey'):
+                if config_dict['ipxe'][x]:
+                    if not os.path.isfile(config_dict['ipxe'][x]):
+                        exit(('ERROR: {0} is not an existing file. Check your' +
+                                'configuration.').format(config_dict['ipxe'][x]))
+            if config_dict['ipxe']['ssl_ca']:
+                    if not os.path.isfile(config_dict['ipxe']['ssl_ca']):
+                        exit(('ERROR: {0} is not an existing file. Check your' +
+                                'configuration.').format(config_dict['ipxe']['ssl_ca']))
+
 
     return(config, config_dict)