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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
|
/*
* Copyright (c) 1983 Regents of the University of California,
* (c) 1998 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 tdelibs/doc/common/bsd-license.html)
*/
/*
* process.cpp handles the requests, which can be of three types:
* ANNOUNCE - announce to a user that a talk is wanted
* LEAVE_INVITE - insert the request into the table
* LOOK_UP - look up to see if a request is waiting in
* in the table for the local user
* DELETE - delete invitation
*/
#include "includ.h"
#include <sys/param.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <netdb.h>
#include <syslog.h>
#include <stdio.h>
#include <string.h>
#include <pwd.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include "process.h"
#include "proto.h"
#include "announce.h"
#include "find_user.h"
#include "table.h"
#include "readconf.h"
#include "defs.h"
#include "machines/forwmach.h"
extern KTalkdTable * ktable;
int prepare_response(NEW_CTL_MSG *mp, NEW_CTL_RESPONSE *rp)
{
rp->type = mp->type;
rp->id_num = htonl(0);
rp->vers = mp->vers;
if ((mp->vers != 0) && (mp->vers != TALK_VERSION)) {
syslog(LOG_WARNING, "Bad protocol version %d", mp->vers);
rp->answer = BADVERSION;
return 0;
}
mp->id_num = ntohl(mp->id_num);
#if 0 // not in the original talkd anymore?
mp->addr.ta_family = ntohs(mp->addr.ta_family);
mp->ctl_addr.ta_family = ntohs(mp->ctl_addr.ta_family);
if (mp->ctl_addr.ta_family != AF_INET) {
syslog(LOG_WARNING, "Bad address, family %d",
mp->ctl_addr.ta_family);
rp->answer = BADCTLADDR;
return 0;
}
#endif
mp->pid = ntohl(mp->pid);
return 1; /* Ok */
}
int process_request(NEW_CTL_MSG *mp, NEW_CTL_RESPONSE *rp, const char* theirhost)
{
NEW_CTL_MSG *ptr;
int ret;
int usercfg = 0; /* set if a user config file exists */
print_request("process_request", mp);
if (!prepare_response(mp, rp))
return PROC_REQ_ERR;
/* Ensure null-termination */
mp->l_name[sizeof(mp->l_name)-1] = 0;
mp->r_name[sizeof(mp->r_name)-1] = 0;
mp->r_tty[sizeof(mp->r_tty)-1] = 0;
ret = PROC_REQ_OK;
switch (mp->type) {
case ANNOUNCE:
/* Open user config file. */
usercfg = init_user_config(mp->r_name);
ret = do_announce(mp, rp, theirhost, usercfg);
if (usercfg) end_user_config();
/* Store in table if normal announce or answmach replacing it.
Not if re-announce, nor if error, nor for forwarding machine */
if ((ret == PROC_REQ_OK) || (ret == PROC_REQ_ANSWMACH_NOT_LOGGED)
|| (ret == PROC_REQ_ANSWMACH_NOT_HERE))
ktable->insert_table(mp, rp, 0L);
case LEAVE_INVITE:
ptr = ktable->find_request(mp);
if (ptr != (NEW_CTL_MSG *)0) {
rp->id_num = htonl(ptr->id_num);
rp->answer = SUCCESS;
} else
ktable->insert_table(mp, rp, 0L);
break;
case LOOK_UP:
ptr = ktable->find_match(mp);
if (ptr != (NEW_CTL_MSG *)0) {
rp->id_num = htonl(ptr->id_num);
rp->addr = ptr->addr;
rp->addr.ta_family = htons(ptr->addr.ta_family);
rp->answer = SUCCESS;
} else {
if (ForwMachine::forwMachProcessLookup(ktable->getTable(), mp)) {
ret = PROC_REQ_FORWMACH; // Don't send any response, forwmach will do it
} else
rp->answer = NOT_HERE;
}
break;
case DELETE:
rp->answer = ktable->delete_invite(mp->id_num);
break;
default:
rp->answer = UNKNOWN_REQUEST;
break;
}
if (ret != PROC_REQ_FORWMACH)
print_response("=> response", rp);
if (mp->vers == 0) { // it's kotalkd talking to us.
// Let's prepare an OTALK response, shifting the first 2 fields
rp->vers /*type in otalk*/ = rp->type;
rp->type /*answer in otalk*/ = rp->answer;
}
return ret;
}
int do_announce(NEW_CTL_MSG *mp, NEW_CTL_RESPONSE *rp, const char* theirhost, int usercfg)
{
NEW_CTL_MSG *ptr;
int result;
char disp[DISPLAYS_LIST_MAX];
char forward[S_CFGLINE], forwardMethod[4];
char * callee;
ForwMachine * fwm;
/* Check if already in the table */
ptr = ktable->find_request(mp);
/* TODO use Voodo #1 from current process.c for byte-swapping stuff */
if ((ptr != NULL) && (
(mp->id_num <= ptr->id_num) || (mp->id_num == (uint32_t)~0x0L))) {
/* a duplicated request, so ignore it */
ktalk_debug("dupannounce %d", mp->id_num);
rp->id_num = htonl(ptr->id_num);
rp->answer = SUCCESS;
return PROC_REQ_ERR;
} else {
if (ptr == (NEW_CTL_MSG *) 0) { /* Not already in the table */
/* see if a forward has been set up */
if ( (usercfg)
&& (read_user_config("Forward", forward, S_CFGLINE))
&& (read_user_config("ForwardMethod", forwardMethod, 4 )) )
{
fwm = new ForwMachine(mp, forward, forwardMethod, mp->id_num);
/* Store in table, because :
(Any method) : this allows to detect dupannounces.
(FWR & FWT) : we'll receive the LOOK_UP */
ktable->insert_table(mp, 0L, fwm);
fwm->start(mp->id_num);
return PROC_REQ_FORWMACH;
}
}
/* see if the user is logged */
char tty[ UT_LINESIZE ]; // mp->r_tty may be smaller then UT_LINESIZE
*tty = '\0';
result = find_user(mp->r_name, tty, disp);
strlcpy( mp->r_tty, tty, sizeof( mp->r_tty ));
ktalk_debug("find_user : result = %d",result);
if (result != SUCCESS) {
ktalk_debug("Couldn t find user ...");
if (result == NOT_HERE)
{ /* Not here ? -> Start answering machine ! */
if (getpwnam(mp->r_name)) /* Does the user exist ? */
{ /* Yes ! -> SUCCESS. */
ktalk_debug("Not logged.");
rp->answer = SUCCESS;
endpwent();
return PROC_REQ_ANSWMACH_NOT_LOGGED; /* answer machine. */
} else
{ /* Non-existent user ... */
endpwent();
/* output an error into the logs */
syslog(LOG_ERR,"User unknown : %s.",mp->r_name);
syslog(LOG_ERR,"The caller is : %s.",mp->l_name);
switch (Options.NEU_behaviour) {
case 2: /* Paranoid setting. Do nothing. */
ktalk_debug("Paranoid setting. Do nothing.");
rp->answer = NOT_HERE;
return PROC_REQ_ERR;
case 0: /* Launch answering machine. */
ktalk_debug("Not here.");
rp->answer = SUCCESS;
return PROC_REQ_ANSWMACH_NOT_HERE;
case 1: /* NEU_user will take the talk. */
ktalk_debug("Not here. I ll take the talk.");
fwm = new ForwMachine(mp, Options.NEU_user,
Options.NEU_forwardmethod, mp->id_num);
/* store in table, because we'll receive the LOOK_UP */
ktable->insert_table(mp, 0L, fwm);
fwm->start(mp->id_num);
return PROC_REQ_FORWMACH;
} /* switch */
} /* getpwnam */
} /* result */
else {
ktalk_debug("not SUCCESS, nor NOT_HERE");
rp->answer = result; /* not SUCCESS, nor NOT_HERE*/
return PROC_REQ_ERR;
}
}
/* Check if there is a forwarding machine on this machine,
matching answerer = r_name and caller = l_name
Then set callee to the initial callee, to display in ktalkdlg */
callee = ForwMachine::forwMachFindMatch(ktable->getTable(), mp);
if (ptr == (NEW_CTL_MSG *) 0) { /* Not already in the table => announce */
rp->answer = announce(mp, theirhost, disp, usercfg, callee);
if (rp->answer == PERMISSION_DENIED) return PROC_REQ_ERR;
ktalk_debug("Announce done.");
return PROC_REQ_OK;
} else {
/* This is an explicit re-announce, so update the id_num
* field to avoid duplicates and re-announce the talk. */
int new_id_num = ktable->new_id();
if (Options.debug_mode)
syslog(LOG_DEBUG, "reannounce : updating id %d to id %d",
ptr->id_num, new_id_num);
ptr->id_num = new_id_num; /* update in the table */
rp->id_num = htonl(ptr->id_num);
rp->answer = announce(mp, theirhost, disp, usercfg, callee);
return PROC_REQ_ANSWMACH;
}
}
}
|
