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From 5739ca30bae336e045657d4a1faab3e9ff92074c Mon Sep 17 00:00:00 2001
From: Julien Desfossez at Revolution Linux
<Julien Desfossez at Revolution Linux>
Date: Tue, 9 Aug 2016 18:11:42 +0200
Subject: Filter printers based on PRINTER_LIST
Last-Update: 2015-10-02
=== modified file 'cups-1.3.9/cups/ipp.c'
Patch-Name: printer-filtering.patch
---
cups/ipp.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 116 insertions(+)
diff --git a/cups/ipp.c b/cups/ipp.c
index 1964962..5ed31f5 100644
--- a/cups/ipp.c
+++ b/cups/ipp.c
@@ -2701,6 +2701,120 @@ ippNew(void)
return (temp);
}
+/*
+ * 'ippFilterPrinters()' - Filter printer list based on environment variables
+ */
+ipp_state_t /* O - Current state */
+ippFilterPrinters(ipp_t *ipp) /* I - IPP data */
+{
+ char *env_printer_list = NULL;
+ char *result_printer_list;
+ char delim_printers[] = ",";
+ char **printer_list_array;
+ char *default_printer_env;
+ int printer_list_size = 0;
+ ipp_attribute_t *filtertmpattr;
+ ipp_attribute_t *filtertmpattr2;
+ int i = 0;
+ int j = 0;
+ int found = 0;
+ int printer_name_found = 0;
+ int len = 0;
+ int last_null = 0;
+
+ /*
+ * First we create an array from PRINTER and PRINTER_LIST
+ */
+ if(getenv("PRINTER") != NULL) {
+ default_printer_env = getenv("PRINTER");
+ printer_list_size++;
+ } else {
+ default_printer_env = (char *)malloc(sizeof(char));
+ default_printer_env = "";
+ }
+
+ env_printer_list = strdup(getenv("PRINTER_LIST"));
+ result_printer_list = strtok(env_printer_list, delim_printers);
+ while(result_printer_list) {
+ if(default_printer_env && strcasecmp(result_printer_list, default_printer_env) != 0)
+ printer_list_size++;
+ result_printer_list = strtok( NULL, delim_printers);
+ }
+
+ printer_list_array = (char **)malloc(printer_list_size * sizeof(char *));
+
+ env_printer_list = strdup(getenv("PRINTER_LIST"));
+
+ result_printer_list = strtok(env_printer_list, delim_printers);
+ while(result_printer_list) {
+ /*
+ * Don't add the default printer if it's defined
+ */
+ if(strcasecmp(result_printer_list, default_printer_env) != 0) {
+ printer_list_array[i] = (char *)malloc(sizeof(result_printer_list));
+ printer_list_array[i++] = result_printer_list;
+ }
+ result_printer_list = strtok( NULL, delim_printers);
+ }
+
+ if(strcasecmp(default_printer_env, "") != 0)
+ printer_list_array[printer_list_size-1] = default_printer_env;
+
+ // number of attributes
+ for (filtertmpattr = ipp->attrs; filtertmpattr != NULL; filtertmpattr = filtertmpattr->next) {
+ len++;
+ }
+ ipp_attribute_t* array[len];
+
+ for (filtertmpattr = ipp->attrs; filtertmpattr != NULL; filtertmpattr = filtertmpattr->next) {
+ array[j++] = filtertmpattr;
+ }
+
+ for (j=0; j<len; j++) {
+ filtertmpattr = array[j];
+ // if the current attribute is a printer_name, find it in the list
+ if ((filtertmpattr->value_tag == IPP_TAG_NAME) &&
+ (strcasecmp(filtertmpattr->name, "printer-name") == 0)) {
+ printer_name_found = 1;
+
+ // compare the current printer with the values in the list
+ for(i = 0; i < printer_list_size; i++) {
+ if (printer_list_array[i] && filtertmpattr->values[0].string.text &&
+ (strcasecmp(filtertmpattr->values[0].string.text, printer_list_array[i]) == 0)) {
+ found = 1;
+ }
+ }
+ }
+
+ // last attribute of a printer (separator) or last attribute
+ if (filtertmpattr->value_tag == IPP_TAG_ZERO || filtertmpattr->next == NULL) {
+ if(found == 0 && printer_name_found == 1) { // not found so we remove it
+ // First printer
+ if(last_null == 0) {
+ ipp->attrs = filtertmpattr->next;
+ } else {
+ // Printer in the middle
+ (array[last_null])->next = filtertmpattr->next;
+ }
+ } else {
+ // the last known good printer
+ last_null = j;
+ }
+ printer_name_found = 0;
+ found = 0;
+ }
+ }
+
+ // remove the last IPP_TAG_ZERO if the last element in the list
+ for (filtertmpattr = ipp->attrs; filtertmpattr != NULL; filtertmpattr = filtertmpattr->next){
+ if (filtertmpattr->value_tag == IPP_TAG_ZERO && filtertmpattr->next == NULL){
+ filtertmpattr2->next = NULL;
+ }
+ filtertmpattr2 = filtertmpattr;
+ }
+ return 0;
+}
+
/*
* 'ippNewRequest()' - Allocate a new IPP request message.
@@ -3047,6 +3161,8 @@ ippReadIO(void *src, /* I - Data source */
*/
DEBUG_puts("2ippReadIO: IPP_TAG_END.");
+ if(getenv("PRINTER_LIST"))
+ ippFilterPrinters(ipp);
ipp->state = IPP_STATE_DATA;
break;
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