Merge ../paraslash.fml/paraslash
[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 sleep(50);
694 if (getppid() == 1)
695 return -E_SERVER_CRASH;
696 }
697 out:
698 return ret;
699 }
700
701 static int send_description(int fd, struct server_command *cmd, const char *handler, int num)
702 {
703 int ret, i;
704
705 for (i = 1; cmd->name && (!num || i <= num); cmd++, i++) {
706 char *perms = cmd_perms_itohuman(cmd->perms);
707 ret = send_va_buffer(fd, "%s\t%s\t%s\t%s\n", cmd->name,
708 handler,
709 perms,
710 cmd->description);
711 free(perms);
712 if (ret < 0)
713 return ret;
714 }
715 return 1;
716 }
717
718 /* always returns string that must be freed by the caller in handler */
719 static struct server_command *get_cmd_ptr(char *name, char **handler)
720 {
721 struct server_command *cmd = cmd_struct;
722
723 for (cmd = cmd_struct; cmd->name; cmd++)
724 if (!strcmp(cmd->name, name)) {
725 if (handler)
726 *handler = para_strdup("para_server"); /* server commands */
727 return cmd;
728 }
729 /* not found, look for commands supported by the current selector */
730 mmd_lock();
731 if (handler)
732 *handler = make_message("the %s selector",
733 selectors[mmd->selector_num].name);
734 cmd = selectors[mmd->selector_num].cmd_list;
735 mmd_unlock();
736 for (; cmd->name; cmd++)
737 if (!strcmp(cmd->name, name))
738 return cmd;
739 return NULL;
740 }
741
742 /* help */
743 static int com_help(int fd, int argc, char **argv)
744 {
745 struct server_command *cmd;
746 char *perms, *handler;
747 int ret;
748
749 if (argc < 2) {
750 /* no argument given, print list of commands */
751 if ((ret = send_description(fd, cmd_struct, "server", 0)) < 0)
752 return ret;
753 mmd_lock();
754 handler = para_strdup(selectors[mmd->selector_num].name);
755 cmd = selectors[mmd->selector_num].cmd_list;
756 mmd_unlock();
757 ret = send_description(fd, cmd, handler, 0);
758 free(handler);
759 return ret;
760 }
761 /* argument given for help */
762 cmd = get_cmd_ptr(argv[1], &handler);
763 if (!cmd) {
764 free(handler);
765 return -E_BAD_CMD;
766 }
767 perms = cmd_perms_itohuman(cmd->perms);
768 ret = send_va_buffer(fd,
769 "NAME\n\t%s - %s\n"
770 "SYNOPSIS\n\t para_client %s\n"
771 "DESCRIPTION\n%s\n"
772 "HANDLER\n"
773 "This command is handled by %s.\n\n"
774 "PERMISSIONS\n"
775 "Needed privileges for %s: %s\n",
776 argv[1],
777 cmd->description,
778 cmd->synopsis,
779 cmd->help,
780 handler,
781 argv[1],
782 perms
783 );
784 free(perms);
785 free(handler);
786 return ret;
787 }
788
789 /* hup */
790 static int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv)
791 {
792 if (argc != 1)
793 return -E_COMMAND_SYNTAX;
794 kill(getppid(), SIGHUP);
795 return 1;
796 }
797
798 /* term */
799 static int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv)
800 {
801 if (argc != 1)
802 return -E_COMMAND_SYNTAX;
803 kill(getppid(), SIGTERM);
804 return 1;
805 }
806
807 static int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv)
808 {
809 if (argc != 1)
810 return -E_COMMAND_SYNTAX;
811 mmd_lock();
812 mmd->new_afs_status_flags |= AFS_PLAYING;
813 mmd->new_afs_status_flags &= ~AFS_NOMORE;
814 mmd_unlock();
815 return 1;
816
817 }
818
819 /* stop */
820 static int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv)
821 {
822 if (argc != 1)
823 return -E_COMMAND_SYNTAX;
824 mmd_lock();
825 mmd->new_afs_status_flags &= ~AFS_PLAYING;
826 mmd->new_afs_status_flags &= ~AFS_REPOS;
827 mmd->new_afs_status_flags |= AFS_NEXT;
828 mmd_unlock();
829 return 1;
830 }
831
832 /* pause */
833 static int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv)
834 {
835 if (argc != 1)
836 return -E_COMMAND_SYNTAX;
837 mmd_lock();
838 if (!afs_paused())
839 mmd->events++;
840 mmd->new_afs_status_flags &= ~AFS_PLAYING;
841 mmd->new_afs_status_flags &= ~AFS_NEXT;
842 mmd_unlock();
843 return 1;
844 }
845
846 static int com_chs(int fd, int argc, char **argv)
847 {
848 int i, ret;
849
850 if (argc == 1) {
851 char *selector;
852 mmd_lock();
853 selector = para_strdup(selectors[mmd->selector_num].name);
854 mmd_unlock();
855 ret = send_va_buffer(fd, "%s\n", selector);
856 free(selector);
857 return ret;
858 }
859 for (i = 0; selectors[i].name; i++) {
860 if (strcmp(selectors[i].name, argv[1]))
861 continue;
862 mmd_lock();
863 mmd->selector_change = i;
864 mmd->events++;
865 mmd_unlock();
866 return 1;
867 }
868 return -E_BAD_SELECTOR;
869 }
870
871 /* next */
872 static int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv)
873 {
874 if (argc != 1)
875 return -E_COMMAND_SYNTAX;
876 mmd_lock();
877 mmd->events++;
878 mmd->new_afs_status_flags |= AFS_NEXT;
879 mmd_unlock();
880 return 1;
881 }
882
883 /* nomore */
884 static int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv)
885 {
886 if (argc != 1)
887 return -E_COMMAND_SYNTAX;
888 mmd_lock();
889 if (afs_playing() || afs_paused())
890 mmd->new_afs_status_flags |= AFS_NOMORE;
891 mmd_unlock();
892 return 1;
893 }
894
895 /* ff */
896 static int com_ff(__a_unused int socket_fd, int argc, char **argv)
897 {
898 long promille;
899 int ret, backwards = 0;
900 unsigned i;
901 char c;
902
903 if (argc != 2)
904 return -E_COMMAND_SYNTAX;
905 if (!(ret = sscanf(argv[1], "%u%c", &i, &c)))
906 return -E_COMMAND_SYNTAX;
907 if (ret > 1 && c == '-')
908 backwards = 1; /* jmp backwards */
909 mmd_lock();
910 ret = -E_NO_AUDIO_FILE;
911 if (!mmd->chunks_total || !mmd->seconds_total)
912 goto out;
913 promille = (1000 * mmd->current_chunk) / mmd->chunks_total;
914 if (backwards)
915 promille -= 1000 * i / mmd->seconds_total;
916 else
917 promille += 1000 * i / mmd->seconds_total;
918 if (promille < 0)
919 promille = 0;
920 if (promille > 1000) {
921 mmd->new_afs_status_flags |= AFS_NEXT;
922 goto out;
923 }
924 mmd->repos_request = (mmd->chunks_total * promille) / 1000;
925 mmd->new_afs_status_flags |= AFS_REPOS;
926 mmd->new_afs_status_flags &= ~AFS_NEXT;
927 mmd->events++;
928 ret = 1;
929 out:
930 mmd_unlock();
931 return ret;
932 }
933
934 /* jmp */
935 static int com_jmp(__a_unused int socket_fd, int argc, char **argv)
936 {
937 long unsigned int i;
938 int ret;
939
940 if (argc != 2)
941 return -E_COMMAND_SYNTAX;
942 if (sscanf(argv[1], "%lu", &i) <= 0)
943 return -E_COMMAND_SYNTAX;
944 mmd_lock();
945 ret = -E_NO_AUDIO_FILE;
946 if (!mmd->chunks_total)
947 goto out;
948 if (i > 100)
949 i = 100;
950 PARA_INFO_LOG("jumping to %lu%%\n", i);
951 mmd->repos_request = (mmd->chunks_total * i + 50)/ 100;
952 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
953 mmd->chunks_sent, mmd->offset);
954 mmd->new_afs_status_flags |= AFS_REPOS;
955 mmd->new_afs_status_flags &= ~AFS_NEXT;
956 ret = 1;
957 mmd->events++;
958 out:
959 mmd_unlock();
960 return ret;
961 }
962
963 /*
964 * check if perms are sufficient to exec a command having perms cmd_perms.
965 * Returns 0 if perms are sufficient, -E_PERM otherwise.
966 */
967 static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
968 {
969 PARA_DEBUG_LOG("%s", "checking permissions\n");
970 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
971 }
972
973 /*
974 * Parse first string from *cmd and lookup in table of valid commands.
975 * On error, NULL is returned.
976 */
977 static struct server_command *parse_cmd(const char *cmdstr)
978 {
979 char buf[255];
980 int n = 0;
981
982 sscanf(cmdstr, "%200s%n", buf, &n);
983 if (!n)
984 return NULL;
985 buf[n] = '\0';
986 return get_cmd_ptr(buf, NULL);
987 }
988
989 long int para_rand(long unsigned max)
990 {
991 return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
992 }
993
994 /* Open user_list file, returns pointer to opened file on success,
995 * NULL on errors
996 */
997 static FILE *open_user_list(char *file)
998 {
999 PARA_DEBUG_LOG("opening user list %s\n", file);
1000 return fopen(file, "r");
1001 }
1002
1003 /*
1004 * lookup user in user_list file. Fills in a user struct containing
1005 * filename of the user's public key as well as the permissions of that user.
1006 * Returns 1 on success, 0 if user does not exist and < 0 on errors.
1007 */
1008 static int get_user(struct user *user) {
1009 FILE *file_ptr;
1010 char *char_ptr;
1011 char line[MAXLINE];
1012 /* keyword, user, key, perms */
1013 char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
1014 int num;
1015
1016 file_ptr = open_user_list(user_list);
1017 if (!file_ptr)
1018 return -E_USERLIST;
1019 while (fgets(line, MAXLINE, file_ptr)) {
1020 // PARA_DEBUG_LOG("%s: Read line (%i bytes) "
1021 // "from config file\n", __func__, strlen(line));
1022 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
1023 continue;
1024 if (!strcmp(w, "user") && !strcmp(user->name, n)) {
1025 PARA_DEBUG_LOG("found entry for %s\n", n);
1026 strcpy(user->name, n);
1027 strcpy(user->pubkey_file, k);
1028 user->perms = 0;
1029 char_ptr = p;
1030 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
1031 tmp[0], tmp[1], tmp[2], tmp[3]);
1032 PARA_DEBUG_LOG("found %i perm entries\n",
1033 num);
1034 user->perms = 0;
1035 while (num > 0) {
1036 num--;
1037 //PARA_DEBUG_LOG("%s: tmp[%i]=%s\n", __func__,
1038 // num, tmp[num]);
1039 if (!strcmp(tmp[num], "AFS_READ"))
1040 user->perms =
1041 user->perms | AFS_READ;
1042 else if (!strcmp(tmp[num], "AFS_WRITE"))
1043 user->perms =
1044 user->perms | AFS_WRITE;
1045 else if (!strcmp(tmp[num], "DB_READ"))
1046 user->perms = user->perms | DB_READ;
1047 else if (!strcmp(tmp[num], "DB_WRITE"))
1048 user->perms = user->perms | DB_WRITE;
1049 else /* unknown permission */
1050 PARA_WARNING_LOG("unknown permission:"
1051 "%s\n", tmp[num]);
1052 }
1053 fclose(file_ptr);
1054 return 1;
1055 }
1056 }
1057 fclose(file_ptr);
1058 return 0;
1059 }
1060
1061 static void init_rc4_keys(void)
1062 {
1063 int i;
1064
1065 for (i = 0; i < 2 * RC4_KEY_LEN; i++)
1066 rc4_buf[i] = para_rand(256);
1067 PARA_DEBUG_LOG("rc4 keys initialized (%u:%u)\n",
1068 (unsigned char) rc4_buf[0],
1069 (unsigned char) rc4_buf[RC4_KEY_LEN]);
1070 RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf);
1071 RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
1072 }
1073
1074 static void rc4_recv(unsigned long len, const unsigned char *indata,
1075 unsigned char *outdata, __a_unused void *private_data)
1076 {
1077 RC4(&rc4_recv_key, len, indata, outdata);
1078 }
1079
1080 static void rc4_send(unsigned long len, const unsigned char *indata,
1081 unsigned char *outdata, __a_unused void *private_data)
1082 {
1083 RC4(&rc4_send_key, len, indata, outdata);
1084 }
1085
1086 int handle_connect(int fd, struct sockaddr_in *addr)
1087 {
1088 int numbytes, ret, argc, use_rc4 = 0;
1089 char buf[STRINGSIZE];
1090 unsigned char crypt_buf[MAXLINE];
1091 struct user u;
1092 struct server_command *cmd = NULL;
1093 long unsigned challenge_nr, chall_response;
1094 char **argv = NULL;
1095 char *p, *command = NULL;
1096
1097 signal(SIGCHLD, SIG_IGN);
1098 signal(SIGINT, SIG_DFL);
1099 signal(SIGTERM, SIG_DFL);
1100 signal(SIGHUP, SIG_DFL);
1101 signal(SIGUSR1, SIG_IGN);
1102
1103 in_addr = addr;
1104 challenge_nr = random();
1105 /* send Welcome message */
1106 ret = send_va_buffer(fd, "This is para_server, version "
1107 PACKAGE_VERSION ".\n" );
1108 if (ret < 0)
1109 goto err_out;
1110 /* recv auth request line */
1111 ret = recv_buffer(fd, buf, sizeof(buf));
1112 if (ret < 0)
1113 goto err_out;
1114 if (ret <= 6) {
1115 ret = -E_AUTH;
1116 goto err_out;
1117 }
1118 numbytes = ret;
1119 ret = -E_AUTH;
1120 if (strncmp(buf, "auth ", 5))
1121 goto err_out;
1122
1123 if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9))
1124 strcpy(u.name, buf + 5); /* client version < 0.2.6 */
1125 else {
1126 strcpy(u.name, buf + 9); /* client version >= 0.2.6 */
1127 use_rc4 = 1;
1128 }
1129 // strcpy(u.name, buf + 5); /* ok, but ugly */
1130 PARA_DEBUG_LOG("received %s request for user %s\n",
1131 use_rc4? "rc4" : "auth", u.name);
1132 /* lookup user in list file */
1133 if ((ret = get_user(&u)) < 0)
1134 goto err_out;
1135 if (!ret) { /* user not found */
1136 PARA_WARNING_LOG("auth request for unknown user %s\n", u.name);
1137 ret = -E_BAD_USER;
1138 goto err_out;
1139 }
1140 ret = para_encrypt_challenge(u.pubkey_file, challenge_nr, crypt_buf);
1141 if (ret <= 0)
1142 goto err_out;
1143 numbytes = ret;
1144 PARA_DEBUG_LOG("sending %d byte challenge\n", numbytes);
1145 /* We can't use send_buffer here since buf may contain null bytes */
1146 ret = send_bin_buffer(fd,(char *) crypt_buf, numbytes);
1147 if (ret < 0)
1148 goto err_out;
1149 /* recv decrypted number */
1150 numbytes = recv_buffer(fd, buf, sizeof(buf));
1151 ret = numbytes;
1152 if (ret < 0)
1153 goto err_out;
1154 ret = -E_AUTH;
1155 if (!numbytes)
1156 goto err_out;
1157 if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1
1158 || chall_response != challenge_nr)
1159 goto err_out;
1160 /* auth successful. Send 'Proceed' message */
1161 PARA_INFO_LOG("good auth for %s (%lu)\n", u.name, challenge_nr);
1162 sprintf(buf, "%s", PROCEED_MSG);
1163 if (use_rc4) {
1164 init_rc4_keys();
1165 ret = para_encrypt_buffer(u.pubkey_file, rc4_buf, 2 * RC4_KEY_LEN,
1166 (unsigned char *)buf + PROCEED_MSG_LEN + 1);
1167 if (ret <= 0)
1168 goto err_out;
1169 numbytes = ret + strlen(PROCEED_MSG) + 1;
1170 } else
1171 numbytes = strlen(buf);
1172 ret = send_bin_buffer(fd, buf, numbytes);
1173 if (ret < 0)
1174 goto err_out;
1175 if (use_rc4)
1176 enable_crypt(fd, rc4_recv, rc4_send, NULL);
1177 /* read command */
1178 while ((numbytes = recv_buffer(fd, buf, sizeof(buf))) > 0) {
1179 // PARA_INFO_LOG("recvd: %s (%d)\n", buf, numbytes);
1180 ret = -E_COMMAND_SYNTAX;
1181 if (command && numbytes + strlen(command) > STRINGSIZE) /* DOS */
1182 goto err_out;
1183 command = para_strcat(command, buf);
1184 if ((p = strstr(command, EOC_MSG))) {
1185 *p = '\0';
1186 break;
1187 }
1188 }
1189 ret = numbytes;
1190 if (ret < 0)
1191 goto err_out;
1192 ret = -E_BAD_CMD;
1193 /* parse command */
1194 if (!(cmd = parse_cmd(command)))
1195 goto err_out;
1196 /* valid command, check permissions */
1197 ret = check_perms(u.perms, cmd);
1198 if (ret < 0)
1199 goto err_out;
1200 /* valid command and sufficient perms */
1201 alarm(0);
1202 argc = split_args(command, &argv, "\n");
1203 mmd_lock();
1204 mmd->num_commands++;
1205 mmd_unlock();
1206 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u.name,
1207 inet_ntoa(addr->sin_addr));
1208 ret = cmd->handler(fd, argc, argv);
1209 if (ret >= 0) {
1210 ret = EXIT_SUCCESS;
1211 goto out;
1212 }
1213 err_out:
1214 if (ret != -E_SEND && ret != -E_RECV) {
1215 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
1216 send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret));
1217 }
1218 ret = EXIT_FAILURE;
1219 out:
1220 free(command);
1221 free(argv);
1222 mmd_lock();
1223 if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
1224 mmd->events++;
1225 mmd->active_connections--;
1226 mmd_unlock();
1227 return ret;
1228 }