ortp_recv: Set remote address
[paraslash.git] / command.c
1 /*
2 * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file command.c does client authentication and executes server commands */
20
21 #include <sys/time.h> /* gettimeofday */
22 #include "crypt.h"
23 #include "server.cmdline.h"
24 #include "db.h"
25 #include "server.h"
26 #include "afs.h"
27 #include "send.h"
28 #include "rc4.h"
29 #include <openssl/rc4.h>
30 #include "error.h"
31 #include "net.h"
32 #include "daemon.h"
33 #include "string.h"
34
35 static RC4_KEY rc4_recv_key;
36 static RC4_KEY rc4_send_key;
37 static unsigned char rc4_buf[2 * RC4_KEY_LEN];
38
39 extern const char *status_item_list[NUM_STAT_ITEMS];
40 extern struct misc_meta_data *mmd;
41 extern struct audio_file_selector selectors[];
42 extern struct sender senders[];
43 extern char *user_list;
44 struct sockaddr_in *in_addr;
45
46 static int com_si(int, int, char **);
47 static int com_version(int, int, char **);
48 static int com_sb(int, int, char **);
49 static int com_sc(int, int, char **);
50 static int com_stat(int, int, char **);
51 static int com_help(int, int, char **);
52 static int com_hup(int, int, char **);
53 static int com_term(int, int, char **);
54 static int com_play(int, int, char **);
55 static int com_stop(int, int, char **);
56 static int com_pause(int, int, char **);
57 static int com_next(int, int, char **);
58 static int com_nomore(int, int, char **);
59 static int com_chs(int, int, char **);
60 static int com_ff(int, int, char **);
61 static int com_jmp(int, int, char **);
62 static int com_sender(int, int, char **);
63
64
65 /* commands that are handled by the server itself */
66 static struct server_command cmd_struct[] = {
67 {
68 .name = "chs",
69 .handler = com_chs,
70 .perms = DB_READ | DB_WRITE,
71 .description = "change the current audio file selector",
72 .synopsis = "chs [new_selector]",
73 .help =
74 "Shutdown the current selector and activate new_selector. If no\n"
75 "argument was given, print the name of the current selector.\n"
76 },
77
78 {
79 .name = "ff",
80 .handler = com_ff,
81 .perms = AFS_READ | AFS_WRITE,
82 .description = "jmp amount of time forwards or backwards "
83 "in current audio file",
84 .synopsis = "ff n[-]",
85 .help =
86
87 "\tSet the 'R' (reposition request) bit of the afs status flags\n"
88 "\tand enqueue a request to jump n seconds forwards or backwards\n"
89 "\tin the current audio file.\n"
90 "\n"
91 "EXAMPLE\n"
92 "\n"
93 "\t\tff 30-\n"
94 "\n"
95 "\tjumps 30 seconds backwards.\n"
96
97 },
98
99 {
100 .name = "help",
101 .handler = com_help,
102 .perms = 0,
103 .description = "print help text",
104 .synopsis = "help [command]",
105 .help =
106
107 "Without any arguments, help prints a list of availible commands. When\n"
108 "issued with a command name as first argument, print out a description\n"
109 "for that command.\n"
110
111 },
112
113 {
114 .name = "hup",
115 .handler = com_hup,
116 .perms = AFS_WRITE,
117 .description = "force reload of config file and log file",
118 .synopsis = "hup",
119 .help =
120
121 "After rereading the config file, a signal is sent to all children\n"
122 "which forces them to close/reopen the log file.\n"
123
124 },
125
126 {
127 .name = "jmp",
128 .handler = com_jmp,
129 .perms = AFS_READ | AFS_WRITE,
130 .description = "jmp to given position in current audio file",
131 .synopsis = "jmp [n]",
132 .help =
133
134 "\tSet the 'R' (reposition request) bit of the afs status flags\n"
135 "\tand enqueue a request to jump to n% of the current audio file,\n"
136 "\twhere 0 <= n <= 100.\n"
137
138 },
139
140 {
141 .name = "next",
142 .handler = com_next,
143 .perms = AFS_READ | AFS_WRITE,
144 .description = "skip rest of current audio file",
145 .synopsis = "next",
146 .help =
147
148 "\tSet the 'N' (next audio file) bit of the afs status flags. When\n"
149 "\tplaying, change audio file immediately. Equivalent to stop\n"
150 "\tif paused, NOP if stopped.\n"
151
152
153 },
154
155 {
156 .name = "nomore",
157 .handler = com_nomore,
158 .perms = AFS_READ | AFS_WRITE,
159 .description = "stop playing after current audio file",
160 .synopsis = "nomore",
161 .help =
162
163 "Set the 'O' (no more) bit of the afs status flags. This instructs\n"
164 "para_server to clear the 'P' (playing) bit as soon as it encounters\n"
165 "the 'N' (next audio file) bit being set.\n"
166 "\n"
167 "Use this command instead of stop if you don't like\n"
168 "sudden endings.\n"
169
170 },
171
172 {
173 .name ="pause",
174 .handler = com_pause,
175 .perms = AFS_READ | AFS_WRITE,
176 .description = "pause current audio file",
177 .synopsis = "pause",
178 .help =
179
180 "\tClear the 'P' (playing) bit of the afs status flags.\n"
181
182 },
183
184 {
185 .name = "play",
186 .handler = com_play,
187 .perms = AFS_READ | AFS_WRITE,
188 .description = "start playing or resume playing when paused",
189 .synopsis = "play",
190 .help =
191
192 "\tSet the 'P' (playing) bit of the afs status flags. This\n"
193 "\tresults in starting/continuing to stream.\n"
194
195 },
196
197 {
198 .name = "sb",
199 .handler = com_sb,
200 .perms = AFS_READ,
201 .description = "print status bar for current audio file",
202 .synopsis = "sb [n]",
203 .help =
204
205 "Without any arguments, sb continuously prints a status bar of the form\n"
206 "\n"
207 " 12:34 [56:12] (56%) filename\n"
208 "\n"
209 "indicating playing time, remaining time, percentage and the name of\n"
210 "the file beeing streamed. Use the optional number n to let stat exit\n"
211 "after having displayed the status bar n times.\n"
212
213 },
214 {
215 .name = "sc",
216 .handler = com_sc,
217 .perms = AFS_READ,
218 .description = "print name of audio file whenever it changes",
219 .synopsis = "sc [n]",
220 .help =
221
222 "\tsc prints exactly one line (the filename of the audio file\n"
223 "\tbeing played) whenever the audio file changes. Stops after\n"
224 "\tn iterations, or never if n is not specified.\n"
225
226 },
227 {
228 .name = "sender",
229 .handler = com_sender,
230 .perms = AFS_READ | AFS_WRITE,
231 .description = "control paraslash internal senders",
232 .synopsis = "sender [s cmd [arguments]]",
233 .help =
234
235 "send command cmd to sender s. cmd may be one of the following:\n"
236 "help, on, off, add, delete, allow, or deny. Note that not all senders\n"
237 "support each command. Try e.g. 'para_client sender http help' for\n"
238 "more information about the http sender. If no argument is given,\n"
239 "print out a list of all senders that are compiled in.\n"
240
241 },
242 {
243 .name = "si",
244 .handler = com_si,
245 .perms = 0,
246 .description = "print server info",
247 .synopsis = "si",
248 .help =
249 "Print server uptime and other information.\n"
250 },
251
252 {
253 .name = "stat",
254 .handler = com_stat,
255 .perms = AFS_READ,
256 .description = "print status info for current audio file",
257 .synopsis = "stat [n]",
258 .help =
259
260 "\tWithout any arguments, stat continuously prints status messages\n"
261 "\tof the audio file being streamed. Use the optional number n\n"
262 "\tto let stat exit after having displayed status n times.\n"
263
264 },
265
266 {
267 .name = "stop",
268 .handler = com_stop,
269 .perms = AFS_READ | AFS_WRITE,
270 .description = "stop playing",
271 .synopsis = "stop",
272 .help =
273
274 "\tClear the 'P' (play) bit and set the 'N' bit of the afs status\n"
275 "\tflags.\n"
276
277 },
278 {
279 .name = "term",
280 .handler = com_term,
281 .perms = AFS_READ | AFS_WRITE,
282 .description = "terminate para_server",
283 .synopsis = "term",
284 .help =
285
286 "Shuts down the server. Instead of this command, you can also send\n"
287 "SIGINT or SIGTERM. It should never be necessary to send SIGKILL.\n"
288
289 },
290 {
291 .name = "version",
292 .handler = com_version,
293 .perms = 0,
294 .description = "print server's version",
295 .synopsis = "version",
296 .help =
297 "Show version and other info\n"
298 },
299 /* this indicates the end of the list. Do not touch. */
300 {
301 .name = NULL,
302 }
303 };
304
305 static void dummy(__a_unused int s)
306 {}
307
308 static void mmd_dup(struct misc_meta_data *new_mmd)
309 {
310 mmd_lock();
311 *new_mmd = *mmd;
312 mmd_unlock();
313 }
314
315 /*
316 * compute human readable string containing
317 * afs_status for given integer value
318 */
319 static char *afs_status_tohuman(unsigned int flags)
320 {
321 if (flags & AFS_PLAYING)
322 return para_strdup("playing");
323 else if (flags & AFS_NEXT)
324 return para_strdup("stopped");
325 else
326 return para_strdup("paused");
327 }
328
329 /*
330 * return human readable permission string. Never returns NULL.
331 */
332 char *cmd_perms_itohuman(unsigned int perms)
333 {
334 char *msg = para_malloc(7 * sizeof(char));
335
336 msg[0] = perms & DB_READ? 'd' : '-';
337 msg[1] = perms & DB_WRITE? 'D' : '-';
338 msg[2] = perms & AFS_READ? 'a' : '-';
339 msg[3] = perms & AFS_WRITE? 'A' : '-';
340 msg[4] = '\0';
341 return msg;
342 }
343
344 /*
345 * Never returns NULL.
346 */
347 static char *afs_get_status_flags(unsigned int flags)
348 {
349 char *msg = para_malloc(5 * sizeof(char));
350
351 msg[0] = (flags & AFS_PLAYING)? 'P' : '_';
352 msg[1] = (flags & AFS_NOMORE)? 'O' : '_';
353 msg[2] = (flags & AFS_NEXT)? 'N' : '_';
354 msg[3] = (flags & AFS_REPOS)? 'R' : '_';
355 msg[4] = '\0';
356 return msg;
357 }
358
359 /*
360 * compute status bar string. Never returns NULL
361 */
362 char *get_sb_string(struct misc_meta_data *nmmd)
363 {
364 char *base, *ret;
365 long long unsigned secs = 0, rsecs = 0, percent = 0;
366
367 base = para_basename(nmmd->filename);
368 if (!base)
369 return para_strdup("");
370 if (!base[0])
371 return base;
372 if (nmmd->chunks_total) {
373 secs = (long long) nmmd->seconds_total * nmmd->chunks_sent
374 / nmmd->chunks_total;
375 rsecs = (long long) nmmd->seconds_total *
376 (nmmd->chunks_total - nmmd->chunks_sent)
377 / nmmd->chunks_total;
378 percent = 100 * ((nmmd->chunks_sent + 5) / 10)
379 / ((nmmd->chunks_total + 5) / 10);
380 }
381 ret = make_message("%llu:%02llu [%llu:%02llu] (%llu%%) %s",
382 secs / 60, secs % 60,
383 rsecs / 60, rsecs % 60,
384 percent,
385 base
386 );
387 free(base);
388 return ret;
389 }
390
391 static char *get_status(struct misc_meta_data *nmmd)
392 {
393 char *bar, *ret, mtime[30] = "";
394 char *status, *flags; /* afs status info */
395 char *ut = uptime_str();
396 long offset = (nmmd->offset + 500) / 1000;
397 struct timeval now;
398 struct tm mtime_tm;
399
400 if (nmmd->audio_format >= 0) {
401 localtime_r(&nmmd->mtime, &mtime_tm);
402 strftime(mtime, 29, "%a %b %d %Y", &mtime_tm);
403 }
404 /* report real status */
405 status = afs_status_tohuman(nmmd->afs_status_flags);
406 flags = afs_get_status_flags(nmmd->afs_status_flags);
407 bar = para_basename(nmmd->filename);
408 gettimeofday(&now, NULL);
409 ret = make_message(
410 "%s:%lu\n" "%s:%s\n" "%s:%i\n" "%s:%u\n"
411 "%s:%s\n" "%s:%s\n" "%s:%s\n" "%s:%s\n"
412 "%s:%li\n" "%s:%s\n" "%s" "%s"
413 "%s:%s\n" "%s:%lu.%lu\n" "%s:%lu.%lu\n",
414 status_item_list[SI_FILE_SIZE], nmmd->size / 1024,
415 status_item_list[SI_MTIME], mtime,
416 status_item_list[SI_LENGTH], nmmd->seconds_total,
417 status_item_list[SI_NUM_PLAYED], nmmd->num_played,
418
419 status_item_list[SI_STATUS_BAR], bar ? bar : "(none)",
420 status_item_list[SI_STATUS], status,
421 status_item_list[SI_STATUS_FLAGS], flags,
422 status_item_list[SI_SELECTOR], selectors[nmmd->selector_num].name,
423
424 status_item_list[SI_OFFSET], offset,
425 status_item_list[SI_FORMAT], audio_format_name(nmmd->audio_format),
426 nmmd->selector_info,
427 nmmd->audio_file_info,
428
429 status_item_list[SI_UPTIME], ut,
430 status_item_list[SI_STREAM_START],
431 (long unsigned)nmmd->stream_start.tv_sec,
432 (long unsigned)nmmd->stream_start.tv_usec,
433 status_item_list[SI_CURRENT_TIME],
434 (long unsigned)now.tv_sec,
435 (long unsigned)now.tv_usec
436
437 );
438 free(bar);
439 free(flags);
440 free(status);
441 free(ut);
442 return ret;
443 }
444
445 static int check_sender_args(int argc, char **argv, struct sender_command_data *scd)
446 {
447 int i;
448 /* this has to match sender.h */
449 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
450
451 scd->sender_num = -1;
452 if (argc < 2)
453 return -E_COMMAND_SYNTAX;
454 for (i = 0; senders[i].name; i++)
455 if (!strcmp(senders[i].name, argv[1]))
456 break;
457 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
458 if (!senders[i].name)
459 return -E_COMMAND_SYNTAX;
460 scd->sender_num = i;
461 for (i = 0; subcmds[i]; i++)
462 if (!strcmp(subcmds[i], argv[2]))
463 break;
464 if (!subcmds[i])
465 return -E_COMMAND_SYNTAX;
466 scd->cmd_num = i;
467 mmd_lock();
468 if (!senders[scd->sender_num].client_cmds[scd->cmd_num]) {
469 mmd_unlock();
470 return -E_SENDER_CMD;
471 }
472 mmd_unlock();
473 switch (scd->cmd_num) {
474 case SENDER_ON:
475 case SENDER_OFF:
476 if (argc != 3)
477 return -E_COMMAND_SYNTAX;
478 break;
479 case SENDER_DENY:
480 case SENDER_ALLOW:
481 if (argc != 4 && argc != 5)
482 return -E_COMMAND_SYNTAX;
483 if (!inet_aton(argv[3], &scd->addr))
484 return -E_COMMAND_SYNTAX;
485 scd->netmask = 32;
486 if (argc == 5) {
487 scd->netmask = atoi(argv[4]);
488 if (scd->netmask < 0 || scd->netmask > 32)
489 return -E_COMMAND_SYNTAX;
490 }
491 break;
492 case SENDER_ADD:
493 case SENDER_DELETE:
494 if (argc != 4 && argc != 5)
495 return -E_COMMAND_SYNTAX;
496 if (!inet_aton(argv[3], &scd->addr))
497 return -E_COMMAND_SYNTAX;
498 scd->port = -1;
499 if (argc == 5) {
500 scd->port = atoi(argv[4]);
501 if (scd->port < 0 || scd->port > 65535)
502 return -E_COMMAND_SYNTAX;
503 }
504 break;
505 default:
506 return -E_COMMAND_SYNTAX;
507 }
508 return 1;
509 }
510
511 static int com_sender(int fd, int argc, char **argv)
512 {
513 int i, ret;
514 struct sender_command_data scd;
515
516 if (argc < 2) {
517 char *msg = NULL;
518 for (i = 0; senders[i].name; i++) {
519 char *tmp = make_message("%s%s\n",
520 msg? msg : "", senders[i].name);
521 free(msg);
522 msg = tmp;
523 }
524 ret = send_buffer(fd, msg);
525 free(msg);
526 return ret;
527 }
528 ret = check_sender_args(argc, argv, &scd);
529 if (ret < 0) {
530 char *msg;
531 if (scd.sender_num < 0)
532 return ret;
533 msg = senders[scd.sender_num].help();
534 send_buffer(fd, msg);
535 free(msg);
536 return 1;
537 }
538 for (i = 0; i < 10; i++) {
539 mmd_lock();
540 if (mmd->sender_cmd_data.cmd_num >= 0) {
541 mmd_unlock();
542 usleep(100 * 1000);
543 continue;
544 }
545 mmd->sender_cmd_data = scd;
546 mmd_unlock();
547 break;
548 }
549 return (i < 10)? 1 : -E_LOCK;
550 }
551
552 /* server info */
553 static int com_si(int fd, int argc, __a_unused char **argv)
554 {
555 int i, ret;
556 char *ut;
557 char *selector_string = NULL, *sender_info = NULL, *sender_list = NULL;
558
559 if (argc != 1)
560 return -E_COMMAND_SYNTAX;
561 mmd_lock();
562 for (i = 0; selectors[i].name; i++) {
563 selector_string = para_strcat(selector_string, selectors[i].name);
564 selector_string = para_strcat(selector_string, " ");
565 }
566 for (i = 0; senders[i].name; i++) {
567 char *info = senders[i].info();
568 sender_info = para_strcat(sender_info, info);
569 free(info);
570 sender_list = para_strcat(sender_list, senders[i].name);
571 sender_list = para_strcat(sender_list, " ");
572 }
573 ut = uptime_str();
574 ret = send_va_buffer(fd, "up: %s\nplayed: %u\n"
575 "pid: %d\n"
576 "connections (active/accepted/total): %u/%u/%u\n"
577 "current loglevel: %i\n"
578 "supported audio file selectors: %s\n"
579 "supported audio formats: %s\n"
580 "supported senders: %s\n"
581 "%s",
582 ut, mmd->num_played,
583 getppid(),
584 mmd->active_connections,
585 mmd->num_commands,
586 mmd->num_connects,
587 conf.loglevel_arg,
588 selector_string,
589 supported_audio_formats(),
590 sender_list,
591 sender_info
592 );
593 mmd_unlock();
594 free(ut);
595 free(selector_string);
596 free(sender_list);
597 free(sender_info);
598 return ret;
599 }
600
601 /* version */
602 static int com_version(int socket_fd, int argc, __a_unused char **argv)
603 {
604 if (argc != 1)
605 return -E_COMMAND_SYNTAX;
606 return send_buffer(socket_fd, "para_server-" PACKAGE_VERSION ", \""
607 CODENAME "\"\n"
608 COPYRIGHT "\n"
609 "built: " BUILD_DATE "\n"
610 SYSTEM ", " CC_VERSION "\n"
611 );
612 }
613
614 /* sc */
615 static int com_sc(int socket_fd, int argc, char **argv)
616 {
617 char *name = NULL;
618 int ret, old = 0, count = -1; /* print af change forever */
619
620 if (argc > 1)
621 count = atoi(argv[1]);
622 repeat:
623 mmd_lock();
624 if (old != mmd->num_played) {
625 old = mmd->num_played;
626 name = para_strdup(mmd->filename);
627 }
628 mmd_unlock();
629 if (name) {
630 ret = send_va_buffer(socket_fd, "%s\n", name);
631 free(name);
632 name = NULL;
633 if (ret < 0)
634 return ret;
635 if (argc > 1 && !--count)
636 return 1;
637 }
638 usleep(500000);
639 goto repeat;
640 }
641
642 /* sb */
643 static int com_sb(int socket_fd, int argc, char **argv)
644 {
645 char *sb;
646 int ret, nr = -1; /* status bar will be printed that many
647 * times. Negative value means: print
648 * forever
649 */
650 if (argc > 1)
651 nr = atoi(argv[1]);
652 while (nr) {
653 mmd_lock();
654 sb = get_sb_string(mmd);
655 mmd_unlock();
656 ret = send_va_buffer(socket_fd, "%s\n", sb);
657 free(sb);
658 if (ret < 0)
659 return ret;
660 if (nr == 1)
661 return 1;
662 usleep(500000);
663 if (nr > 0)
664 nr--;
665 }
666 return 1;
667 }
668
669 /* stat */
670 static int com_stat(int socket_fd, int argc, char **argv)
671 {
672 int ret, num = 0;/* status will be printed that many
673 * times. num <= 0 means: print forever
674 */
675 struct misc_meta_data tmp, *nmmd = &tmp;
676 char *s;
677
678 signal(SIGUSR1, dummy);
679
680 if (argc > 1)
681 num = atoi(argv[1]);
682 for (;;) {
683
684 mmd_dup(nmmd);
685 s = get_status(nmmd);
686 ret = send_buffer(socket_fd, s);
687 free(s);
688 if (ret < 0)
689 goto out;
690 ret = 1;
691 if (num == 1)
692 goto out;
693 usleep(500000 * 100);
694 }
695 out:
696 return ret;
697 }
698
699 static int send_description(int fd, struct server_command *cmd, const char *handler, int num)
700 {
701 int ret, i;
702
703 for (i = 1; cmd->name && (!num || i <= num); cmd++, i++) {
704 char *perms = cmd_perms_itohuman(cmd->perms);
705 ret = send_va_buffer(fd, "%s\t%s\t%s\t%s\n", cmd->name,
706 handler,
707 perms,
708 cmd->description);
709 free(perms);
710 if (ret < 0)
711 return ret;
712 }
713 return 1;
714 }
715
716 /* always returns string that must be freed by the caller in handler */
717 static struct server_command *get_cmd_ptr(char *name, char **handler)
718 {
719 struct server_command *cmd = cmd_struct;
720
721 for (cmd = cmd_struct; cmd->name; cmd++)
722 if (!strcmp(cmd->name, name)) {
723 if (handler)
724 *handler = para_strdup("para_server"); /* server commands */
725 return cmd;
726 }
727 /* not found, look for commands supported by the current selector */
728 mmd_lock();
729 if (handler)
730 *handler = make_message("the %s selector",
731 selectors[mmd->selector_num].name);
732 cmd = selectors[mmd->selector_num].cmd_list;
733 mmd_unlock();
734 for (; cmd->name; cmd++)
735 if (!strcmp(cmd->name, name))
736 return cmd;
737 return NULL;
738 }
739
740 /* help */
741 static int com_help(int fd, int argc, char **argv)
742 {
743 struct server_command *cmd;
744 char *perms, *handler;
745 int ret;
746
747 if (argc < 2) {
748 /* no argument given, print list of commands */
749 if ((ret = send_description(fd, cmd_struct, "server", 0)) < 0)
750 return ret;
751 mmd_lock();
752 handler = para_strdup(selectors[mmd->selector_num].name);
753 cmd = selectors[mmd->selector_num].cmd_list;
754 mmd_unlock();
755 ret = send_description(fd, cmd, handler, 0);
756 free(handler);
757 return ret;
758 }
759 /* argument given for help */
760 cmd = get_cmd_ptr(argv[1], &handler);
761 if (!cmd) {
762 free(handler);
763 return -E_BAD_CMD;
764 }
765 perms = cmd_perms_itohuman(cmd->perms);
766 ret = send_va_buffer(fd,
767 "NAME\n\t%s - %s\n"
768 "SYNOPSIS\n\t para_client %s\n"
769 "DESCRIPTION\n%s\n"
770 "HANDLER\n"
771 "This command is handled by %s.\n\n"
772 "PERMISSIONS\n"
773 "Needed privileges for %s: %s\n",
774 argv[1],
775 cmd->description,
776 cmd->synopsis,
777 cmd->help,
778 handler,
779 argv[1],
780 perms
781 );
782 free(perms);
783 free(handler);
784 return ret;
785 }
786
787 /* hup */
788 static int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv)
789 {
790 if (argc != 1)
791 return -E_COMMAND_SYNTAX;
792 kill(getppid(), SIGHUP);
793 return 1;
794 }
795
796 /* term */
797 static int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv)
798 {
799 if (argc != 1)
800 return -E_COMMAND_SYNTAX;
801 kill(getppid(), SIGTERM);
802 return 1;
803 }
804
805 static int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv)
806 {
807 if (argc != 1)
808 return -E_COMMAND_SYNTAX;
809 mmd_lock();
810 mmd->new_afs_status_flags |= AFS_PLAYING;
811 mmd->new_afs_status_flags &= ~AFS_NOMORE;
812 mmd_unlock();
813 return 1;
814
815 }
816
817 /* stop */
818 static int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv)
819 {
820 if (argc != 1)
821 return -E_COMMAND_SYNTAX;
822 mmd_lock();
823 mmd->new_afs_status_flags &= ~AFS_PLAYING;
824 mmd->new_afs_status_flags &= ~AFS_REPOS;
825 mmd->new_afs_status_flags |= AFS_NEXT;
826 mmd_unlock();
827 return 1;
828 }
829
830 /* pause */
831 static int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv)
832 {
833 if (argc != 1)
834 return -E_COMMAND_SYNTAX;
835 mmd_lock();
836 if (!afs_paused())
837 mmd->events++;
838 mmd->new_afs_status_flags &= ~AFS_PLAYING;
839 mmd->new_afs_status_flags &= ~AFS_NEXT;
840 mmd_unlock();
841 return 1;
842 }
843
844 static int com_chs(int fd, int argc, char **argv)
845 {
846 int i, ret;
847
848 if (argc == 1) {
849 char *selector;
850 mmd_lock();
851 selector = para_strdup(selectors[mmd->selector_num].name);
852 mmd_unlock();
853 ret = send_va_buffer(fd, "%s\n", selector);
854 free(selector);
855 return ret;
856 }
857 for (i = 0; selectors[i].name; i++) {
858 if (strcmp(selectors[i].name, argv[1]))
859 continue;
860 mmd_lock();
861 mmd->selector_change = i;
862 mmd->events++;
863 mmd_unlock();
864 return 1;
865 }
866 return -E_BAD_SELECTOR;
867 }
868
869 /* next */
870 static int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv)
871 {
872 if (argc != 1)
873 return -E_COMMAND_SYNTAX;
874 mmd_lock();
875 mmd->events++;
876 mmd->new_afs_status_flags |= AFS_NEXT;
877 mmd_unlock();
878 return 1;
879 }
880
881 /* nomore */
882 static int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv)
883 {
884 if (argc != 1)
885 return -E_COMMAND_SYNTAX;
886 mmd_lock();
887 if (afs_playing() || afs_paused())
888 mmd->new_afs_status_flags |= AFS_NOMORE;
889 mmd_unlock();
890 return 1;
891 }
892
893 /* ff */
894 static int com_ff(__a_unused int socket_fd, int argc, char **argv)
895 {
896 long promille;
897 int ret, backwards = 0;
898 unsigned i;
899 char c;
900
901 if (argc != 2)
902 return -E_COMMAND_SYNTAX;
903 if (!(ret = sscanf(argv[1], "%u%c", &i, &c)))
904 return -E_COMMAND_SYNTAX;
905 if (ret > 1 && c == '-')
906 backwards = 1; /* jmp backwards */
907 mmd_lock();
908 ret = -E_NO_AUDIO_FILE;
909 if (!mmd->chunks_total || !mmd->seconds_total)
910 goto out;
911 promille = (1000 * mmd->current_chunk) / mmd->chunks_total;
912 if (backwards)
913 promille -= 1000 * i / mmd->seconds_total;
914 else
915 promille += 1000 * i / mmd->seconds_total;
916 if (promille < 0)
917 promille = 0;
918 if (promille > 1000) {
919 mmd->new_afs_status_flags |= AFS_NEXT;
920 goto out;
921 }
922 mmd->repos_request = (mmd->chunks_total * promille) / 1000;
923 mmd->new_afs_status_flags |= AFS_REPOS;
924 mmd->new_afs_status_flags &= ~AFS_NEXT;
925 mmd->events++;
926 ret = 1;
927 out:
928 mmd_unlock();
929 return ret;
930 }
931
932 /* jmp */
933 static int com_jmp(__a_unused int socket_fd, int argc, char **argv)
934 {
935 long unsigned int i;
936 int ret;
937
938 if (argc != 2)
939 return -E_COMMAND_SYNTAX;
940 if (sscanf(argv[1], "%lu", &i) <= 0)
941 return -E_COMMAND_SYNTAX;
942 mmd_lock();
943 ret = -E_NO_AUDIO_FILE;
944 if (!mmd->chunks_total)
945 goto out;
946 if (i > 100)
947 i = 100;
948 PARA_INFO_LOG("jumping to %lu%%\n", i);
949 mmd->repos_request = (mmd->chunks_total * i + 50)/ 100;
950 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
951 mmd->chunks_sent, mmd->offset);
952 mmd->new_afs_status_flags |= AFS_REPOS;
953 mmd->new_afs_status_flags &= ~AFS_NEXT;
954 ret = 1;
955 mmd->events++;
956 out:
957 mmd_unlock();
958 return ret;
959 }
960
961 /*
962 * check if perms are sufficient to exec a command having perms cmd_perms.
963 * Returns 0 if perms are sufficient, -E_PERM otherwise.
964 */
965 static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
966 {
967 PARA_DEBUG_LOG("%s", "checking permissions\n");
968 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
969 }
970
971 /*
972 * Parse first string from *cmd and lookup in table of valid commands.
973 * On error, NULL is returned.
974 */
975 static struct server_command *parse_cmd(const char *cmdstr)
976 {
977 char buf[255];
978 int n = 0;
979
980 sscanf(cmdstr, "%200s%n", buf, &n);
981 if (!n)
982 return NULL;
983 buf[n] = '\0';
984 return get_cmd_ptr(buf, NULL);
985 }
986
987 long int para_rand(long unsigned max)
988 {
989 return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
990 }
991
992 /* Open user_list file, returns pointer to opened file on success,
993 * NULL on errors
994 */
995 static FILE *open_user_list(char *file)
996 {
997 PARA_DEBUG_LOG("opening user list %s\n", file);
998 return fopen(file, "r");
999 }
1000
1001 /*
1002 * lookup user in user_list file. Fills in a user struct containing
1003 * filename of the user's public key as well as the permissions of that user.
1004 * Returns 1 on success, 0 if user does not exist and < 0 on errors.
1005 */
1006 static int get_user(struct user *user) {
1007 FILE *file_ptr;
1008 char *char_ptr;
1009 char line[MAXLINE];
1010 /* keyword, user, key, perms */
1011 char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
1012 int num;
1013
1014 file_ptr = open_user_list(user_list);
1015 if (!file_ptr)
1016 return -E_USERLIST;
1017 while (fgets(line, MAXLINE, file_ptr)) {
1018 // PARA_DEBUG_LOG("%s: Read line (%i bytes) "
1019 // "from config file\n", __func__, strlen(line));
1020 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
1021 continue;
1022 if (!strcmp(w, "user") && !strcmp(user->name, n)) {
1023 PARA_DEBUG_LOG("found entry for %s\n", n);
1024 strcpy(user->name, n);
1025 strcpy(user->pubkey_file, k);
1026 user->perms = 0;
1027 char_ptr = p;
1028 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
1029 tmp[0], tmp[1], tmp[2], tmp[3]);
1030 PARA_DEBUG_LOG("found %i perm entries\n",
1031 num);
1032 user->perms = 0;
1033 while (num > 0) {
1034 num--;
1035 //PARA_DEBUG_LOG("%s: tmp[%i]=%s\n", __func__,
1036 // num, tmp[num]);
1037 if (!strcmp(tmp[num], "AFS_READ"))
1038 user->perms =
1039 user->perms | AFS_READ;
1040 else if (!strcmp(tmp[num], "AFS_WRITE"))
1041 user->perms =
1042 user->perms | AFS_WRITE;
1043 else if (!strcmp(tmp[num], "DB_READ"))
1044 user->perms = user->perms | DB_READ;
1045 else if (!strcmp(tmp[num], "DB_WRITE"))
1046 user->perms = user->perms | DB_WRITE;
1047 else /* unknown permission */
1048 PARA_WARNING_LOG("unknown permission:"
1049 "%s\n", tmp[num]);
1050 }
1051 fclose(file_ptr);
1052 return 1;
1053 }
1054 }
1055 fclose(file_ptr);
1056 return 0;
1057 }
1058
1059 static void init_rc4_keys(void)
1060 {
1061 int i;
1062
1063 for (i = 0; i < 2 * RC4_KEY_LEN; i++)
1064 rc4_buf[i] = para_rand(256);
1065 PARA_DEBUG_LOG("rc4 keys initialized (%u:%u)\n",
1066 (unsigned char) rc4_buf[0],
1067 (unsigned char) rc4_buf[RC4_KEY_LEN]);
1068 RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf);
1069 RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
1070 }
1071
1072 static void rc4_recv(unsigned long len, const unsigned char *indata,
1073 unsigned char *outdata, __a_unused void *private_data)
1074 {
1075 RC4(&rc4_recv_key, len, indata, outdata);
1076 }
1077
1078 static void rc4_send(unsigned long len, const unsigned char *indata,
1079 unsigned char *outdata, __a_unused void *private_data)
1080 {
1081 RC4(&rc4_send_key, len, indata, outdata);
1082 }
1083
1084 int handle_connect(int fd, struct sockaddr_in *addr)
1085 {
1086 int numbytes, ret, argc, use_rc4 = 0;
1087 char buf[STRINGSIZE];
1088 unsigned char crypt_buf[MAXLINE];
1089 struct user u;
1090 struct server_command *cmd = NULL;
1091 long unsigned challenge_nr, chall_response;
1092 char **argv = NULL;
1093 char *p, *command = NULL;
1094
1095 signal(SIGCHLD, SIG_IGN);
1096 signal(SIGINT, SIG_DFL);
1097 signal(SIGTERM, SIG_DFL);
1098 signal(SIGHUP, SIG_DFL);
1099 signal(SIGUSR1, SIG_IGN);
1100
1101 in_addr = addr;
1102 challenge_nr = random();
1103 /* send Welcome message */
1104 ret = send_va_buffer(fd, "This is para_server, version "
1105 PACKAGE_VERSION ".\n" );
1106 if (ret < 0)
1107 goto err_out;
1108 /* recv auth request line */
1109 ret = recv_buffer(fd, buf, sizeof(buf));
1110 if (ret < 0)
1111 goto err_out;
1112 if (ret <= 6) {
1113 ret = -E_AUTH;
1114 goto err_out;
1115 }
1116 numbytes = ret;
1117 ret = -E_AUTH;
1118 if (strncmp(buf, "auth ", 5))
1119 goto err_out;
1120
1121 if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9))
1122 strcpy(u.name, buf + 5); /* client version < 0.2.6 */
1123 else {
1124 strcpy(u.name, buf + 9); /* client version >= 0.2.6 */
1125 use_rc4 = 1;
1126 }
1127 // strcpy(u.name, buf + 5); /* ok, but ugly */
1128 PARA_DEBUG_LOG("received %s request for user %s\n",
1129 use_rc4? "rc4" : "auth", u.name);
1130 /* lookup user in list file */
1131 if ((ret = get_user(&u)) < 0)
1132 goto err_out;
1133 if (!ret) { /* user not found */
1134 PARA_WARNING_LOG("auth request for unknown user %s\n", u.name);
1135 ret = -E_BAD_USER;
1136 goto err_out;
1137 }
1138 ret = para_encrypt_challenge(u.pubkey_file, challenge_nr, crypt_buf);
1139 if (ret <= 0)
1140 goto err_out;
1141 numbytes = ret;
1142 PARA_DEBUG_LOG("sending %d byte challenge\n", numbytes);
1143 /* We can't use send_buffer here since buf may contain null bytes */
1144 ret = send_bin_buffer(fd,(char *) crypt_buf, numbytes);
1145 if (ret < 0)
1146 goto err_out;
1147 /* recv decrypted number */
1148 numbytes = recv_buffer(fd, buf, sizeof(buf));
1149 ret = numbytes;
1150 if (ret < 0)
1151 goto err_out;
1152 ret = -E_AUTH;
1153 if (!numbytes)
1154 goto err_out;
1155 if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1
1156 || chall_response != challenge_nr)
1157 goto err_out;
1158 /* auth successful. Send 'Proceed' message */
1159 PARA_INFO_LOG("good auth for %s (%lu)\n", u.name, challenge_nr);
1160 sprintf(buf, "%s", PROCEED_MSG);
1161 if (use_rc4) {
1162 init_rc4_keys();
1163 ret = para_encrypt_buffer(u.pubkey_file, rc4_buf, 2 * RC4_KEY_LEN,
1164 (unsigned char *)buf + PROCEED_MSG_LEN + 1);
1165 if (ret <= 0)
1166 goto err_out;
1167 numbytes = ret + strlen(PROCEED_MSG) + 1;
1168 } else
1169 numbytes = strlen(buf);
1170 ret = send_bin_buffer(fd, buf, numbytes);
1171 if (ret < 0)
1172 goto err_out;
1173 if (use_rc4)
1174 enable_crypt(fd, rc4_recv, rc4_send, NULL);
1175 /* read command */
1176 while ((numbytes = recv_buffer(fd, buf, sizeof(buf))) > 0) {
1177 // PARA_INFO_LOG("recvd: %s (%d)\n", buf, numbytes);
1178 ret = -E_COMMAND_SYNTAX;
1179 if (command && numbytes + strlen(command) > STRINGSIZE) /* DOS */
1180 goto err_out;
1181 command = para_strcat(command, buf);
1182 if ((p = strstr(command, EOC_MSG))) {
1183 *p = '\0';
1184 break;
1185 }
1186 }
1187 ret = numbytes;
1188 if (ret < 0)
1189 goto err_out;
1190 ret = -E_BAD_CMD;
1191 /* parse command */
1192 if (!(cmd = parse_cmd(command)))
1193 goto err_out;
1194 /* valid command, check permissions */
1195 ret = check_perms(u.perms, cmd);
1196 if (ret < 0)
1197 goto err_out;
1198 /* valid command and sufficient perms */
1199 alarm(0);
1200 argc = split_args(command, &argv, "\n");
1201 mmd_lock();
1202 mmd->num_commands++;
1203 mmd_unlock();
1204 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u.name,
1205 inet_ntoa(addr->sin_addr));
1206 ret = cmd->handler(fd, argc, argv);
1207 if (ret >= 0) {
1208 ret = EXIT_SUCCESS;
1209 goto out;
1210 }
1211 err_out:
1212 if (ret != -E_SEND && ret != -E_RECV) {
1213 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
1214 send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret));
1215 }
1216 ret = EXIT_FAILURE;
1217 out:
1218 free(command);
1219 free(argv);
1220 mmd_lock();
1221 if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
1222 mmd->events++;
1223 mmd->active_connections--;
1224 mmd_unlock();
1225 return ret;
1226 }