1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Copyright (c) 1998 Burkhard Lehner and David Faure
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* (BSD License, from kdelibs/doc/common/bsd-license.html)
*/
#include <config.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <time.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h> // Needed on some systems.
#endif
#include <qstrlist.h>
#include <qfile.h>
#include "includ.h"
#include "proto.h"
#include "announce.h" // for N_CHARS
bool sendToKtalk (const char *username, const char *announce)
/*
sends an announcement to all running ktalk clients.
username: name of the user who shall receive the announce
announce: name and IP address of the one who requests the talk
return value: TRUE if at least one ktalk was found and running
FALSE otherwise
*/
{
// WABA: Disabled for reasons outlined below by XXX.
return FALSE;
#if 0
// Create a socket
int sock;
if ((sock = socket (AF_UNIX, SOCK_DGRAM, 0)) < 0) return FALSE;
// Bind it to a temporary file in /tmp
struct sockaddr_un tempAddr;
tempAddr.sun_family = AF_UNIX;
if (tmpnam (tempAddr.sun_path) == 0 ||
bind (sock, (struct sockaddr *) &tempAddr, sizeof (tempAddr)) == -1) {
close (sock);
debug("Couldn't create temporary socket!");
return FALSE;
}
// find sockets of running ktalk clients
QString tempDir = "/tmp";
QString templ = QString ("ktalk-") + username + "-";
bool announceok = FALSE;
char buffer [N_CHARS+2];
buffer [0] = 1;
strcpy (buffer + 1, announce); // announce is at most N_CHARS long.
unsigned int announcelen = strlen(buffer);
unsigned int len;
DIR *dir = opendir (QFile::encodeName(tempDir));
struct dirent *entry;
QStrList dirList;
struct sockaddr_un ktalkAddr;
ktalkAddr.sun_family = AF_UNIX;
while ((entry = readdir (dir))) {
// send announce to each of them
// XXX: What happens if user okir does this:
// cd /tmp
// ln kfm_foo_bar_baz ktalk-joedoe-blablabla
// when I now try to talk to joedoe, the name@host string
// is sent to the kfm socket (which is not owned
// by me but someone else!)
//
// Besides, this approach allows me to snoop on the
// talk requests other users receive; if I want to find
// out who's talking to janet, all I need is to write
// a small app that listens on /tmp/ktalk-janet-foo
//
if (templ == QFile::decodeName(entry->d_name).left(templ.length())) {
QString path = tempDir + "/" + QFile::decodeName(entry->d_name);
strncpy (ktalkAddr.sun_path, QFile::encodeName(path), sizeof (ktalkAddr.sun_path));
len = sendto (sock, buffer, announcelen, 0,
(struct sockaddr *) &ktalkAddr, sizeof (ktalkAddr));
if (len == announcelen)
announceok = TRUE;
}
}
closedir (dir);
if (!announceok) {
close (sock);
unlink (tempAddr.sun_path);
return FALSE;
}
// at least one accepted the packet, wait for response :
bool result = FALSE;
fd_set readFDs;
FD_ZERO (&readFDs);
FD_SET (sock, &readFDs);
char answer;
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 500000; // Wait for answer at most 0.5 seconds
if ( (select (sock + 1, &readFDs, 0, 0, &timeout) > 0) &&
(recv (sock, &answer, 1, 0) == 1) ) {
result = ( answer == 42 ); // Answer from ktalk has to be 42.
}
close (sock);
unlink (tempAddr.sun_path);
debug("Announce to ktalk : result = %d",result);
return result;
#endif
}
|
