| 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 | |
| 47 | extern 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 | */ |
| 55 | int |
| 56 | ProcXIQueryVersion(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 | |
| 133 | int |
| 134 | SProcXIQueryVersion(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 | |
| 144 | void |
| 145 | SRepXIQueryVersion(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 | } |