68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
#define HOOK_NAME "selection"
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#include <dix-config.h>
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#include <stdio.h>
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#include "dix/selection_priv.h"
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#include "namespace.h"
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#include "hooks.h"
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static inline const char *stripNS(const char* name) {
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if ((!name) || (name[0] != '<'))
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return name; // can this ever happen ?
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const char *got = strchr(name, '>');
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if (!got)
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return name;
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return ++got;
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}
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/*
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* This hook is rewriting the client visible selection names to internally used,
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* per namespace ones. Whenever a client is asking for a selection, it's name
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* is replaced by a namespaced one, e.g. asking for "PRIMARY" while being in
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* namespace "foo" will become "<foo>PRIMARY"
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*
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* A malicious client could still send specially crafted messages to others,
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* asking them to send their selection data to him. This needs to be solved
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* separately, by a send hook.
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*/
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void hookSelectionFilter(CallbackListPtr *pcbl, void *unused, void *calldata)
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{
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XNS_HOOK_HEAD(SelectionFilterParamRec);
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/* no rewrite if client is in root namespace */
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if (subj->ns->superPower)
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return;
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const char *origSelectionName = NameForAtom(param->selection);
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char selname[PATH_MAX] = { 0 };
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snprintf(selname, sizeof(selname)-1, "<%s>%s", subj->ns->name, origSelectionName);
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Atom realSelection = MakeAtom(selname, strlen(selname), TRUE);
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switch (param->op) {
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case SELECTION_FILTER_GETOWNER:
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case SELECTION_FILTER_SETOWNER:
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case SELECTION_FILTER_CONVERT:
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case SELECTION_FILTER_LISTEN:
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// TODO: check whether window really belongs to the client
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param->selection = realSelection;
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break;
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case SELECTION_FILTER_NOTIFY:
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{
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// need to translate back, since we're having the ns-prefixed name here
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const char *stripped = stripNS(origSelectionName);
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param->selection = MakeAtom(stripped, strlen(stripped), TRUE);
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break;
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}
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// nothing to do here: already having the client visible name
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case SELECTION_FILTER_EV_REQUEST:
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case SELECTION_FILTER_EV_CLEAR:
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break;
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}
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}
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