1/*
2 * Copyright © 2009 Red Hat, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors: Peter Hutterer
24 *
25 */
26
27/**
28 * @file xiqueryversion.c
29 * Protocol handling for the XIQueryVersion request/reply.
30 */
31
32#ifdef HAVE_DIX_CONFIG_H
33#include <dix-config.h>
34#endif
35
36#include "inputstr.h"
37
38#include <X11/Xmd.h>
39#include <X11/X.h>
40#include <X11/extensions/XI2proto.h>
41
42#include "exglobals.h"
43#include "exevents.h"
44#include "xiqueryversion.h"
45#include "misc.h"
46
47extern XExtensionVersion XIVersion;     /* defined in getvers.c */
48
49/**
50 * Return the supported XI version.
51 *
52 * Saves the version the client claims to support as well, for future
53 * reference.
54 */
55int
56ProcXIQueryVersion(ClientPtr client)
57{
58    xXIQueryVersionReply rep;
59    XIClientPtr pXIClient;
60    int major, minor;
61
62    REQUEST(xXIQueryVersionReq);
63    REQUEST_SIZE_MATCH(xXIQueryVersionReq);
64
65    /* This request only exists after XI2 */
66    if (stuff->major_version < 2) {
67        client->errorValue = stuff->major_version;
68        return BadValue;
69    }
70
71    pXIClient = dixLookupPrivate(&client->devPrivates, XIClientPrivateKey);
72
73    if (version_compare(XIVersion.major_version, XIVersion.minor_version,
74                stuff->major_version, stuff->minor_version) > 0) {
75        major = stuff->major_version;
76        minor = stuff->minor_version;
77    } else {
78        major = XIVersion.major_version;
79        minor = XIVersion.minor_version;
80    }
81
82    if (pXIClient->major_version) {
83
84        /* Check to see if the client has only ever asked
85         * for version 2.2 or higher
86         */
87        if (version_compare(major, minor, 2, 2) >= 0 &&
88            version_compare(pXIClient->major_version, pXIClient->minor_version, 2, 2) >= 0)
89        {
90
91            /* As of version 2.2, Peter promises to never again break
92             * backward compatibility, so we'll return the requested
93             * version to the client but leave the server internal
94             * version set to the highest requested value
95             */
96            if (version_compare(major, minor,
97                                pXIClient->major_version, pXIClient->minor_version) > 0)
98            {
99                pXIClient->major_version = major;
100                pXIClient->minor_version = minor;
101            }
102        } else {
103            if (version_compare(major, minor,
104                                pXIClient->major_version, pXIClient->minor_version) < 0) {
105
106                client->errorValue = stuff->major_version;
107                return BadValue;
108            }
109            major = pXIClient->major_version;
110            minor = pXIClient->minor_version;
111        }
112    } else {
113        pXIClient->major_version = major;
114        pXIClient->minor_version = minor;
115    }
116
117    rep = (xXIQueryVersionReply) {
118        .repType = X_Reply,
119        .RepType = X_XIQueryVersion,
120        .sequenceNumber = client->sequence,
121        .length = 0,
122        .major_version = major,
123        .minor_version = minor
124    };
125
126    WriteReplyToClient(client, sizeof(xXIQueryVersionReply), &rep);
127
128    return Success;
129}
130
131/* Swapping routines */
132
133int _X_COLD
134SProcXIQueryVersion(ClientPtr client)
135{
136    REQUEST(xXIQueryVersionReq);
137    swaps(&stuff->length);
138    REQUEST_AT_LEAST_SIZE(xXIQueryVersionReq);
139    swaps(&stuff->major_version);
140    swaps(&stuff->minor_version);
141    return (ProcXIQueryVersion(client));
142}
143
144void _X_COLD
145SRepXIQueryVersion(ClientPtr client, int size, xXIQueryVersionReply * rep)
146{
147    swaps(&rep->sequenceNumber);
148    swapl(&rep->length);
149    swaps(&rep->major_version);
150    swaps(&rep->minor_version);
151    WriteToClient(client, size, rep);
152}
153