Re: airprint patches for cups

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

I have a different patch (attached) in production for years.
It was some trouble to get the MDNS-SD part working (CUPS announcing a server name that wouldn't resolve, mdnsd announcing a link-local address cupsd was not listening on), but in the end, it worked.

--- scheduler/conf.c.orig	2017-06-30 17:44:38.000000000 +0200
+++ scheduler/conf.c	2017-10-09 18:25:08.000000000 +0200
@@ -745,7 +745,7 @@
   DefaultShared            = CUPS_DEFAULT_DEFAULT_SHARED;
 
 #if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
-  cupsdSetString(&DNSSDSubTypes, "_cups,_print");
+  cupsdSetString(&DNSSDSubTypes, "_cups,_print,_universal");
 #endif /* HAVE_DNSSD || HAVE_AVAHI */
 
   cupsdSetString(&LPDConfigFile, CUPS_DEFAULT_LPD_CONFIG_FILE);
--- scheduler/dirsvc.c.orig	2017-06-30 17:44:38.000000000 +0200
+++ scheduler/dirsvc.c	2017-10-09 18:25:08.000000000 +0200
@@ -414,6 +414,12 @@
     keyvalue[count  ][0] = "pdl";
     keyvalue[count++][1] = p->pdl ? p->pdl : "application/postscript";
 
+    /* iOS 6 does not accept this printer as AirPrint printer if there is
+       no URF txt record or "URF=none", "DM3" is the minimum needed found
+       by try and error */
+    keyvalue[count  ][0] = "URF";
+    keyvalue[count++][1] = "DM3";
+
     if (get_auth_info_required(p, air_str, sizeof(air_str)))
     {
       keyvalue[count  ][0] = "air";
--- scheduler/printers.c.orig	2017-06-30 17:44:38.000000000 +0200
+++ scheduler/printers.c	2017-10-09 18:25:08.000000000 +0200
@@ -3689,7 +3689,9 @@
       }
       else if (!_cups_strcasecmp(type->super, "image"))
       {
-        if (!_cups_strcasecmp(type->type, "jpeg"))
+        if (!_cups_strcasecmp(type->type, "urf"))
+	  strlcat(pdl, "image/urf,", sizeof(pdl));
+	else if (!_cups_strcasecmp(type->type, "jpeg"))
 	  strlcat(pdl, "image/jpeg,", sizeof(pdl));
 	else if (!_cups_strcasecmp(type->type, "png"))
 	  strlcat(pdl, "image/png,", sizeof(pdl));
--- conf/mime.types.orig	2017-06-30 17:44:38.000000000 +0200
+++ conf/mime.types	2017-10-09 18:25:08.000000000 +0200
@@ -111,6 +111,9 @@
 image/x-bitmap			bmp string(0,BM) + !printable(2,14)
 image/x-icon			ico
 
+# Needed for printing from iOS (AirPrint) clients
+image/urf			urf string(0,UNIRAST<00>)
+
 ########################################################################
 #
 # Text files...
--- conf/mime.convs.in.orig	2017-06-30 17:44:38.000000000 +0200
+++ conf/mime.convs.in	2017-10-09 18:25:08.000000000 +0200
@@ -47,6 +47,9 @@
 application/vnd.cups-raster	image/pwg-raster		100	rastertopwg
 application/vnd.cups-raster	image/urf			100	rastertopwg
 
+# Needed for printing from iOS (AirPrint) clients
+image/urf    	      	       application/pdf			100	-
+
 ########################################################################
 #
 # Raw filter...