summaryrefslogtreecommitdiffstats
path: root/sesman/sesman.c
blob: 29037f0ca8a884a6f5e7c56b2ad27a9fd7a3ecc5 (plain)
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
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
/**
 * xrdp: A Remote Desktop Protocol server.
 *
 * Copyright (C) Jay Sorg 2004-2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 *
 * @file sesman.c
 * @brief Main program file
 * @author Jay Sorg
 *
 */

#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif

#include "sesman.h"

int g_sck;
int g_pid;
unsigned char g_fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
struct config_sesman *g_cfg; /* defined in config.h */

tintptr g_term_event = 0;

/******************************************************************************/
int sesman_listen_test(struct config_sesman *cfg)
{
    int error;
    int sck;
    int rv = 0;

    sck = g_tcp_socket();
    if (sck < 0)
    {
        return 1;
    }

    log_message(LOG_LEVEL_DEBUG, "Testing if xrdp-sesman can listen on %s port %s.",
                                 cfg->listen_address, cfg->listen_port);
    g_tcp_set_non_blocking(sck);
    error = scp_tcp_bind(sck, cfg->listen_address, cfg->listen_port);
    if (error == 0)
    {
        /* try to listen */
        error = g_tcp_listen(sck);

        if (error == 0)
        {
            /* if listen succeeded, stop listen immediately */
            g_sck_close(sck);
        }
        else
        {
            rv = 1;
        }
    }
    else
    {
        rv = 1;
    }

    return rv;
}
/******************************************************************************/
/**
 *
 * @brief Starts sesman main loop
 *
 */
int
sesman_main_loop(void)
{
    int in_sck;
    int error;
    int robjs_count;
    int cont;
    int rv = 0;
    tbus sck_obj;
    tbus robjs[8];

    g_sck = g_tcp_socket();
    if (g_sck < 0)
    {
        log_message(LOG_LEVEL_ERROR, "error opening socket, g_tcp_socket() failed...");
        return 1;
    }

    g_tcp_set_non_blocking(g_sck);
    error = scp_tcp_bind(g_sck, g_cfg->listen_address, g_cfg->listen_port);

    if (error == 0)
    {
        error = g_tcp_listen(g_sck);

        if (error == 0)
        {
            log_message(LOG_LEVEL_INFO, "listening to port %s on %s",
                        g_cfg->listen_port, g_cfg->listen_address);
            sck_obj = g_create_wait_obj_from_socket(g_sck, 0);
            cont = 1;

            while (cont)
            {
                /* build the wait obj list */
                robjs_count = 0;
                robjs[robjs_count++] = sck_obj;
                robjs[robjs_count++] = g_term_event;

                /* wait */
                if (g_obj_wait(robjs, robjs_count, 0, 0, -1) != 0)
                {
                    /* error, should not get here */
                    g_sleep(100);
                }

                if (g_is_wait_obj_set(g_term_event)) /* term */
                {
                    break;
                }

                if (g_is_wait_obj_set(sck_obj)) /* incoming connection */
                {
                    in_sck = g_tcp_accept(g_sck);

                    if ((in_sck == -1) && g_tcp_last_error_would_block(g_sck))
                    {
                        /* should not get here */
                        g_sleep(100);
                    }
                    else if (in_sck == -1)
                    {
                        /* error, should not get here */
                        break;
                    }
                    else
                    {
                        /* we've got a connection, so we pass it to scp code */
                        LOG_DBG("new connection");
                        scp_process_start((void*)(tintptr)in_sck);
                        g_sck_close(in_sck);
                    }
                }
            }

            g_delete_wait_obj_from_socket(sck_obj);
        }
        else
        {
            log_message(LOG_LEVEL_ERROR, "listen error %d (%s)",
                        g_get_errno(), g_get_strerror());
            rv = 1;
        }
    }
    else
    {
        log_message(LOG_LEVEL_ERROR, "bind error on "
                    "port '%s': %d (%s)", g_cfg->listen_port,
                    g_get_errno(), g_get_strerror());
        rv = 1;
    }
    g_tcp_close(g_sck);
    return rv;
}

/******************************************************************************/
void
print_usage(int retcode)
{
    g_printf("xrdp-sesman - xrdp session manager\n\n");
    g_printf("Usage: xrdp-sesman [options]\n");
    g_printf("   -n, --nodaemon   run as foreground process\n");
    g_printf("   -k, --kill       kill running xrdp-sesman\n");
    g_printf("   -h, --help       show this help\n");
    g_deinit();
    g_exit(retcode);
}

/******************************************************************************/
int
main(int argc, char **argv)
{
    int fd;
    enum logReturns log_error;
    int error;
    int daemon = 1;
    int pid;
    char pid_s[32];
    char text[256];
    char pid_file[256];
    char cfg_file[256];

    g_init("xrdp-sesman");
    g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);

    if (1 == argc)
    {
        /* no options on command line. normal startup */
        g_printf("starting sesman...\n");
        daemon = 1;
    }
    else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--nodaemon")) ||
                             (0 == g_strcasecmp(argv[1], "-nodaemon")) ||
                             (0 == g_strcasecmp(argv[1], "-n")) ||
                             (0 == g_strcasecmp(argv[1], "-ns"))))
    {
        /* starts sesman not daemonized */
        g_printf("starting sesman in foreground...\n");
        daemon = 0;
    }
    else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--help")) ||
                             (0 == g_strcasecmp(argv[1], "-help")) ||
                             (0 == g_strcasecmp(argv[1], "-h"))))
    {
        print_usage(0);
    }
    else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--kill")) ||
                             (0 == g_strcasecmp(argv[1], "-kill")) ||
                             (0 == g_strcasecmp(argv[1], "-k"))))
    {
        /* killing running sesman */
        /* check if sesman is running */
        if (!g_file_exist(pid_file))
        {
            g_printf("sesman is not running (pid file not found - %s)\n", pid_file);
            g_deinit();
            g_exit(1);
        }

        fd = g_file_open(pid_file);

        if (-1 == fd)
        {
            g_printf("error opening pid file[%s]: %s\n", pid_file, g_get_strerror());
            return 1;
        }

        g_memset(pid_s, 0, sizeof(pid_s));
        error = g_file_read(fd, pid_s, 31);

        if (-1 == error)
        {
            g_printf("error reading pid file: %s\n", g_get_strerror());
            g_file_close(fd);
            g_deinit();
            g_exit(error);
        }

        g_file_close(fd);
        pid = g_atoi(pid_s);

        error = g_sigterm(pid);

        if (0 != error)
        {
            g_printf("error killing sesman: %s\n", g_get_strerror());
        }
        else
        {
            g_file_delete(pid_file);
        }

        g_deinit();
        g_exit(error);
    }
    else
    {
        /* there's something strange on the command line */
        g_printf("Error: invalid command line arguments\n\n");
        print_usage(1);
    }

    if (g_file_exist(pid_file))
    {
        g_printf("xrdp-sesman is already running.\n");
        g_printf("if it's not running, try removing ");
        g_printf("%s", pid_file);
        g_printf("\n");
        g_deinit();
        g_exit(1);
    }

    /* reading config */
    g_cfg = g_new0(struct config_sesman, 1);

    if (0 == g_cfg)
    {
        g_printf("error creating config: quitting.\n");
        g_deinit();
        g_exit(1);
    }

    //g_cfg->log.fd = -1; /* don't use logging before reading its config */
    if (0 != config_read(g_cfg))
    {
        g_printf("error reading config: %s\nquitting.\n", g_get_strerror());
        g_deinit();
        g_exit(1);
    }

    g_snprintf(cfg_file, 255, "%s/sesman.ini", XRDP_CFG_PATH);

    /* starting logging subsystem */
    log_error = log_start(cfg_file, "xrdp-sesman");

    if (log_error != LOG_STARTUP_OK)
    {
        switch (log_error)
        {
            case LOG_ERROR_MALLOC:
                g_writeln("error on malloc. cannot start logging. quitting.");
                break;
            case LOG_ERROR_FILE_OPEN:
                g_writeln("error opening log file [%s]. quitting.",
                          getLogFile(text, 255));
                break;
            default:
                g_writeln("error");
                break;
        }

        g_deinit();
        g_exit(1);
    }

    /* libscp initialization */
    scp_init();

    if (daemon)
    {
        /* start of daemonizing code */
        g_pid = g_fork();

        if (0 != g_pid)
        {
            if (sesman_listen_test(g_cfg) != 0)
	    {

                log_message(LOG_LEVEL_ERROR, "Failed to start xrdp-sesman daemon, "
                                             "possibly address already in use.");
                g_deinit();
                g_exit(1);
            }
            g_deinit();
            g_exit(0);
        }

        g_file_close(0);
        g_file_close(1);
        g_file_close(2);

        if (g_file_open("/dev/null") < 0)
        {
        }

        if (g_file_open("/dev/null") < 0)
        {
        }

        if (g_file_open("/dev/null") < 0)
        {
        }
    }

    /* signal handling */
    g_pid = g_getpid();
    /* old style signal handling is now managed synchronously by a
     * separate thread. uncomment this block if you need old style
     * signal handling and comment out thread_sighandler_start()
     * going back to old style for the time being
     * problem with the sigaddset functions in sig.c - jts */
#if 1
    g_signal_hang_up(sig_sesman_reload_cfg); /* SIGHUP  */
    g_signal_user_interrupt(sig_sesman_shutdown); /* SIGINT  */
    g_signal_terminate(sig_sesman_shutdown); /* SIGTERM */
    g_signal_child_stop(sig_sesman_session_end); /* SIGCHLD */
#endif
#if 0
    thread_sighandler_start();
#endif

    if (daemon)
    {
        /* writing pid file */
        fd = g_file_open(pid_file);

        if (-1 == fd)
        {
            log_message(LOG_LEVEL_ERROR,
                        "error opening pid file[%s]: %s",
                        pid_file, g_get_strerror());
            log_end();
            g_deinit();
            g_exit(1);
        }

        g_sprintf(pid_s, "%d", g_pid);
        g_file_write(fd, pid_s, g_strlen(pid_s));
        g_file_close(fd);
    }

    /* start program main loop */
    log_message(LOG_LEVEL_INFO,
                "starting xrdp-sesman with pid %d", g_pid);

    /* make sure the socket directory exists */
    g_mk_temp_dir("xrdp-sesman");

    /* make sure the /tmp/.X11-unix directory exist */
    if (!g_directory_exist("/tmp/.X11-unix"))
    {
        if (!g_create_dir("/tmp/.X11-unix"))
        {
            log_message(LOG_LEVEL_ERROR,
                "sesman.c: error creating dir /tmp/.X11-unix");
        }
        g_chmod_hex("/tmp/.X11-unix", 0x1777);
    }

    g_snprintf(text, 255, "xrdp_sesman_%8.8x_main_term", g_pid);
    g_term_event = g_create_wait_obj(text);

    error = sesman_main_loop();

    /* clean up PID file on exit */
    if (daemon)
    {
        g_file_delete(pid_file);
    }

    g_delete_wait_obj(g_term_event);

    if (!daemon)
    {
        log_end();
    }

    g_deinit();
    g_exit(error);
    return 0;
}