2 * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
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.
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.
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.
19 /** \file command.c does client authentication and executes server commands */
21 #include <sys/time.h> /* gettimeofday */
22 #include "server.cmdline.h"
28 #include <openssl/rc4.h>
34 #include "user_list.h"
35 #include "server_command_list.h"
37 static RC4_KEY rc4_recv_key;
38 static RC4_KEY rc4_send_key;
39 static unsigned char rc4_buf[2 * RC4_KEY_LEN];
41 extern const char *status_item_list[NUM_STAT_ITEMS];
42 extern struct misc_meta_data *mmd;
43 extern struct audio_file_selector selectors[];
44 extern struct sender senders[];
45 extern char *user_list;
46 struct sockaddr_in *in_addr;
48 static void dummy(__a_unused int s)
51 static void mmd_dup(struct misc_meta_data *new_mmd)
59 * compute human readable string containing
60 * vss status for given integer value
62 static char *vss_status_tohuman(unsigned int flags)
64 if (flags & VSS_PLAYING)
65 return para_strdup("playing");
66 else if (flags & VSS_NEXT)
67 return para_strdup("stopped");
69 return para_strdup("paused");
73 * return human readable permission string. Never returns NULL.
75 char *cmd_perms_itohuman(unsigned int perms)
77 char *msg = para_malloc(5 * sizeof(char));
79 msg[0] = perms & DB_READ? 'a' : '-';
80 msg[1] = perms & DB_WRITE? 'A' : '-';
81 msg[2] = perms & VSS_READ? 'v' : '-';
82 msg[3] = perms & VSS_WRITE? 'V' : '-';
90 static char *vss_get_status_flags(unsigned int flags)
92 char *msg = para_malloc(5 * sizeof(char));
94 msg[0] = (flags & VSS_PLAYING)? 'P' : '_';
95 msg[1] = (flags & VSS_NOMORE)? 'O' : '_';
96 msg[2] = (flags & VSS_NEXT)? 'N' : '_';
97 msg[3] = (flags & VSS_REPOS)? 'R' : '_';
103 * compute status bar string. Never returns NULL
105 char *get_sb_string(struct misc_meta_data *nmmd)
108 long long unsigned secs = 0, rsecs = 0, percent = 0;
110 base = para_basename(nmmd->filename);
112 return para_strdup("");
115 if (nmmd->chunks_total) {
116 secs = (long long) nmmd->seconds_total * nmmd->chunks_sent
117 / nmmd->chunks_total;
118 rsecs = (long long) nmmd->seconds_total *
119 (nmmd->chunks_total - nmmd->chunks_sent)
120 / nmmd->chunks_total;
121 percent = 100 * ((nmmd->chunks_sent + 5) / 10)
122 / ((nmmd->chunks_total + 5) / 10);
124 ret = make_message("%llu:%02llu [%llu:%02llu] (%llu%%) %s",
125 secs / 60, secs % 60,
126 rsecs / 60, rsecs % 60,
134 static char *get_status(struct misc_meta_data *nmmd)
136 char *bar, *ret, mtime[30] = "";
137 char *status, *flags; /* vss status info */
138 char *ut = uptime_str();
139 long offset = (nmmd->offset + 500) / 1000;
143 if (nmmd->audio_format >= 0) {
144 localtime_r(&nmmd->mtime, &mtime_tm);
145 strftime(mtime, 29, "%a %b %d %Y", &mtime_tm);
147 /* report real status */
148 status = vss_status_tohuman(nmmd->vss_status_flags);
149 flags = vss_get_status_flags(nmmd->vss_status_flags);
150 bar = para_basename(nmmd->filename);
151 gettimeofday(&now, NULL);
153 "%s:%lu\n" "%s:%s\n" "%s:%i\n" "%s:%u\n"
154 "%s:%s\n" "%s:%s\n" "%s:%s\n" "%s:%s\n"
155 "%s:%li\n" "%s:%s\n" "%s" "%s"
156 "%s:%s\n" "%s:%lu.%lu\n" "%s:%lu.%lu\n",
157 status_item_list[SI_FILE_SIZE], nmmd->size / 1024,
158 status_item_list[SI_MTIME], mtime,
159 status_item_list[SI_LENGTH], nmmd->seconds_total,
160 status_item_list[SI_NUM_PLAYED], nmmd->num_played,
162 status_item_list[SI_STATUS_BAR], bar ? bar : "(none)",
163 status_item_list[SI_STATUS], status,
164 status_item_list[SI_STATUS_FLAGS], flags,
165 status_item_list[SI_SELECTOR], selectors[nmmd->selector_num].name,
167 status_item_list[SI_OFFSET], offset,
168 status_item_list[SI_FORMAT], audio_format_name(nmmd->audio_format),
170 nmmd->audio_file_info,
172 status_item_list[SI_UPTIME], ut,
173 status_item_list[SI_STREAM_START],
174 (long unsigned)nmmd->stream_start.tv_sec,
175 (long unsigned)nmmd->stream_start.tv_usec,
176 status_item_list[SI_CURRENT_TIME],
177 (long unsigned)now.tv_sec,
178 (long unsigned)now.tv_usec
188 static int check_sender_args(int argc, char **argv, struct sender_command_data *scd)
191 /* this has to match sender.h */
192 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
194 scd->sender_num = -1;
196 return -E_COMMAND_SYNTAX;
197 for (i = 0; senders[i].name; i++)
198 if (!strcmp(senders[i].name, argv[1]))
200 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
201 if (!senders[i].name)
202 return -E_COMMAND_SYNTAX;
204 for (i = 0; subcmds[i]; i++)
205 if (!strcmp(subcmds[i], argv[2]))
208 return -E_COMMAND_SYNTAX;
211 if (!senders[scd->sender_num].client_cmds[scd->cmd_num]) {
213 return -E_SENDER_CMD;
216 switch (scd->cmd_num) {
220 return -E_COMMAND_SYNTAX;
224 if (argc != 4 && argc != 5)
225 return -E_COMMAND_SYNTAX;
226 if (!inet_aton(argv[3], &scd->addr))
227 return -E_COMMAND_SYNTAX;
230 scd->netmask = atoi(argv[4]);
231 if (scd->netmask < 0 || scd->netmask > 32)
232 return -E_COMMAND_SYNTAX;
237 if (argc != 4 && argc != 5)
238 return -E_COMMAND_SYNTAX;
239 if (!inet_aton(argv[3], &scd->addr))
240 return -E_COMMAND_SYNTAX;
243 scd->port = atoi(argv[4]);
244 if (scd->port < 0 || scd->port > 65535)
245 return -E_COMMAND_SYNTAX;
249 return -E_COMMAND_SYNTAX;
254 int com_sender(int fd, int argc, char **argv)
257 struct sender_command_data scd;
261 for (i = 0; senders[i].name; i++) {
262 char *tmp = make_message("%s%s\n",
263 msg? msg : "", senders[i].name);
267 ret = send_buffer(fd, msg);
271 ret = check_sender_args(argc, argv, &scd);
274 if (scd.sender_num < 0)
276 msg = senders[scd.sender_num].help();
277 send_buffer(fd, msg);
281 for (i = 0; i < 10; i++) {
283 if (mmd->sender_cmd_data.cmd_num >= 0) {
288 mmd->sender_cmd_data = scd;
292 return (i < 10)? 1 : -E_LOCK;
296 int com_si(int fd, int argc, __a_unused char **argv)
300 char *selector_string = NULL, *sender_info = NULL, *sender_list = NULL;
303 return -E_COMMAND_SYNTAX;
305 for (i = 0; selectors[i].name; i++) {
306 selector_string = para_strcat(selector_string, selectors[i].name);
307 selector_string = para_strcat(selector_string, " ");
309 for (i = 0; senders[i].name; i++) {
310 char *info = senders[i].info();
311 sender_info = para_strcat(sender_info, info);
313 sender_list = para_strcat(sender_list, senders[i].name);
314 sender_list = para_strcat(sender_list, " ");
317 ret = send_va_buffer(fd, "up: %s\nplayed: %u\n"
319 "connections (active/accepted/total): %u/%u/%u\n"
320 "current loglevel: %i\n"
321 "supported audio file selectors: %s\n"
322 "supported audio formats: %s\n"
323 "supported senders: %s\n"
327 mmd->active_connections,
332 supported_audio_formats(),
338 free(selector_string);
345 int com_version(int socket_fd, int argc, __a_unused char **argv)
348 return -E_COMMAND_SYNTAX;
349 return send_buffer(socket_fd, "para_server-" PACKAGE_VERSION ", \""
352 "built: " BUILD_DATE "\n"
353 SYSTEM ", " CC_VERSION "\n"
358 int com_sc(int socket_fd, int argc, char **argv)
361 int ret, old = 0, count = -1; /* print af change forever */
364 count = atoi(argv[1]);
367 if (old != mmd->num_played) {
368 old = mmd->num_played;
369 name = para_strdup(mmd->filename);
373 ret = send_va_buffer(socket_fd, "%s\n", name);
378 if (argc > 1 && !--count)
386 int com_sb(int socket_fd, int argc, char **argv)
389 int ret, nr = -1; /* status bar will be printed that many
390 * times. Negative value means: print
397 sb = get_sb_string(mmd);
399 ret = send_va_buffer(socket_fd, "%s\n", sb);
413 int com_stat(int socket_fd, int argc, char **argv)
415 int ret, num = 0;/* status will be printed that many
416 * times. num <= 0 means: print forever
418 struct misc_meta_data tmp, *nmmd = &tmp;
421 signal(SIGUSR1, dummy);
428 s = get_status(nmmd);
429 ret = send_buffer(socket_fd, s);
438 return -E_SERVER_CRASH;
444 static int send_list_of_commands(int fd, struct server_command *cmd,
449 for (i = 1; cmd->name; cmd++, i++) {
450 char *perms = cmd_perms_itohuman(cmd->perms);
451 ret = send_va_buffer(fd, "%s\t%s\t%s\t%s\n", cmd->name,
462 /* always returns string that must be freed by the caller in handler */
463 static struct server_command *get_cmd_ptr(char *name, char **handler)
465 struct server_command *cmd;
467 for (cmd = server_cmds; cmd->name; cmd++)
468 if (!strcmp(cmd->name, name)) {
470 *handler = para_strdup("para_server"); /* server commands */
473 /* not found, look for commands supported by the current selector */
476 *handler = make_message("the %s selector",
477 selectors[mmd->selector_num].name);
478 cmd = selectors[mmd->selector_num].cmd_list;
480 for (; cmd->name; cmd++)
481 if (!strcmp(cmd->name, name))
487 int com_help(int fd, int argc, char **argv)
489 struct server_command *cmd;
490 char *perms, *handler;
494 /* no argument given, print list of commands */
495 if ((ret = send_list_of_commands(fd, server_cmds, "server")) < 0)
498 handler = para_strdup(selectors[mmd->selector_num].name);
499 cmd = selectors[mmd->selector_num].cmd_list;
501 ret = send_list_of_commands(fd, cmd, handler);
505 /* argument given for help */
506 cmd = get_cmd_ptr(argv[1], &handler);
511 perms = cmd_perms_itohuman(cmd->perms);
512 ret = send_va_buffer(fd,
531 int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv)
534 return -E_COMMAND_SYNTAX;
535 kill(getppid(), SIGHUP);
540 int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv)
543 return -E_COMMAND_SYNTAX;
544 kill(getppid(), SIGTERM);
548 int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv)
551 return -E_COMMAND_SYNTAX;
553 mmd->new_vss_status_flags |= VSS_PLAYING;
554 mmd->new_vss_status_flags &= ~VSS_NOMORE;
561 int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv)
564 return -E_COMMAND_SYNTAX;
566 mmd->new_vss_status_flags &= ~VSS_PLAYING;
567 mmd->new_vss_status_flags &= ~VSS_REPOS;
568 mmd->new_vss_status_flags |= VSS_NEXT;
574 int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv)
577 return -E_COMMAND_SYNTAX;
581 mmd->new_vss_status_flags &= ~VSS_PLAYING;
582 mmd->new_vss_status_flags &= ~VSS_NEXT;
587 int com_chs(int fd, int argc, char **argv)
594 selector = para_strdup(selectors[mmd->selector_num].name);
596 ret = send_va_buffer(fd, "%s\n", selector);
600 for (i = 0; selectors[i].name; i++) {
601 if (strcmp(selectors[i].name, argv[1]))
604 mmd->selector_change = i;
609 return -E_BAD_SELECTOR;
613 int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv)
616 return -E_COMMAND_SYNTAX;
619 mmd->new_vss_status_flags |= VSS_NEXT;
625 int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv)
628 return -E_COMMAND_SYNTAX;
630 if (vss_playing() || vss_paused())
631 mmd->new_vss_status_flags |= VSS_NOMORE;
637 int com_ff(__a_unused int socket_fd, int argc, char **argv)
640 int ret, backwards = 0;
645 return -E_COMMAND_SYNTAX;
646 if (!(ret = sscanf(argv[1], "%u%c", &i, &c)))
647 return -E_COMMAND_SYNTAX;
648 if (ret > 1 && c == '-')
649 backwards = 1; /* jmp backwards */
651 ret = -E_NO_AUDIO_FILE;
652 if (!mmd->chunks_total || !mmd->seconds_total)
654 promille = (1000 * mmd->current_chunk) / mmd->chunks_total;
656 promille -= 1000 * i / mmd->seconds_total;
658 promille += 1000 * i / mmd->seconds_total;
661 if (promille > 1000) {
662 mmd->new_vss_status_flags |= VSS_NEXT;
665 mmd->repos_request = (mmd->chunks_total * promille) / 1000;
666 mmd->new_vss_status_flags |= VSS_REPOS;
667 mmd->new_vss_status_flags &= ~VSS_NEXT;
676 int com_jmp(__a_unused int socket_fd, int argc, char **argv)
682 return -E_COMMAND_SYNTAX;
683 if (sscanf(argv[1], "%lu", &i) <= 0)
684 return -E_COMMAND_SYNTAX;
686 ret = -E_NO_AUDIO_FILE;
687 if (!mmd->chunks_total)
691 PARA_INFO_LOG("jumping to %lu%%\n", i);
692 mmd->repos_request = (mmd->chunks_total * i + 50)/ 100;
693 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
694 mmd->chunks_sent, mmd->offset);
695 mmd->new_vss_status_flags |= VSS_REPOS;
696 mmd->new_vss_status_flags &= ~VSS_NEXT;
705 * check if perms are sufficient to exec a command having perms cmd_perms.
706 * Returns 0 if perms are sufficient, -E_PERM otherwise.
708 static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
710 PARA_DEBUG_LOG("%s", "checking permissions\n");
711 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
715 * Parse first string from *cmd and lookup in table of valid commands.
716 * On error, NULL is returned.
718 static struct server_command *parse_cmd(const char *cmdstr)
723 sscanf(cmdstr, "%200s%n", buf, &n);
727 return get_cmd_ptr(buf, NULL);
730 long int para_rand(long unsigned max)
732 return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
735 static void init_rc4_keys(void)
739 for (i = 0; i < 2 * RC4_KEY_LEN; i++)
740 rc4_buf[i] = para_rand(256);
741 PARA_DEBUG_LOG("rc4 keys initialized (%u:%u)\n",
742 (unsigned char) rc4_buf[0],
743 (unsigned char) rc4_buf[RC4_KEY_LEN]);
744 RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf);
745 RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
748 static void rc4_recv(unsigned long len, const unsigned char *indata,
749 unsigned char *outdata, __a_unused void *private_data)
751 RC4(&rc4_recv_key, len, indata, outdata);
754 static void rc4_send(unsigned long len, const unsigned char *indata,
755 unsigned char *outdata, __a_unused void *private_data)
757 RC4(&rc4_send_key, len, indata, outdata);
760 int handle_connect(int fd, struct sockaddr_in *addr)
762 int numbytes, ret, argc, use_rc4 = 0;
763 char buf[STRINGSIZE];
764 unsigned char crypt_buf[MAXLINE];
766 struct server_command *cmd = NULL;
767 long unsigned challenge_nr, chall_response;
769 char *p, *command = NULL;
771 signal(SIGCHLD, SIG_IGN);
772 signal(SIGINT, SIG_DFL);
773 signal(SIGTERM, SIG_DFL);
774 signal(SIGHUP, SIG_DFL);
775 signal(SIGUSR1, SIG_IGN);
778 challenge_nr = random();
779 /* send Welcome message */
780 ret = send_va_buffer(fd, "This is para_server, version "
781 PACKAGE_VERSION ".\n" );
784 /* recv auth request line */
785 ret = recv_buffer(fd, buf, sizeof(buf));
794 if (strncmp(buf, "auth ", 5))
797 if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9))
798 u.name = para_strdup(buf + 5); /* client version < 0.2.6 */
800 u.name = para_strdup(buf + 9); /* client version >= 0.2.6 */
803 PARA_DEBUG_LOG("received %s request for user %s\n",
804 use_rc4? "rc4" : "auth", u.name);
805 if ((ret = lookup_user(&u)) < 0)
807 ret = para_encrypt_challenge(u.rsa, challenge_nr, crypt_buf);
811 PARA_DEBUG_LOG("sending %d byte challenge\n", numbytes);
812 /* We can't use send_buffer here since buf may contain null bytes */
813 ret = send_bin_buffer(fd,(char *) crypt_buf, numbytes);
816 /* recv decrypted number */
817 numbytes = recv_buffer(fd, buf, sizeof(buf));
824 if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1
825 || chall_response != challenge_nr)
827 /* auth successful. Send 'Proceed' message */
828 PARA_INFO_LOG("good auth for %s (%lu)\n", u.name, challenge_nr);
829 sprintf(buf, "%s", PROCEED_MSG);
832 ret = para_encrypt_buffer(u.rsa, rc4_buf, 2 * RC4_KEY_LEN,
833 (unsigned char *)buf + PROCEED_MSG_LEN + 1);
836 numbytes = ret + strlen(PROCEED_MSG) + 1;
838 numbytes = strlen(buf);
839 ret = send_bin_buffer(fd, buf, numbytes);
843 enable_crypt(fd, rc4_recv, rc4_send, NULL);
845 while ((numbytes = recv_buffer(fd, buf, sizeof(buf))) > 0) {
846 // PARA_INFO_LOG("recvd: %s (%d)\n", buf, numbytes);
847 ret = -E_COMMAND_SYNTAX;
848 if (command && numbytes + strlen(command) > STRINGSIZE) /* DOS */
850 command = para_strcat(command, buf);
851 if ((p = strstr(command, EOC_MSG))) {
861 if (!(cmd = parse_cmd(command)))
863 /* valid command, check permissions */
864 ret = check_perms(u.perms, cmd);
867 /* valid command and sufficient perms */
869 argc = split_args(command, &argv, "\n");
873 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u.name,
874 inet_ntoa(addr->sin_addr));
875 ret = cmd->handler(fd, argc, argv);
881 if (ret != -E_SEND && ret != -E_RECV) {
882 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
883 send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret));
890 if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
892 mmd->active_connections--;