2 * Copyright (C) 1997-2006 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 */
23 #include "server.cmdline.h"
29 #include <openssl/rc4.h>
35 void (*crypt_function_recv)(unsigned long len, const unsigned char *indata,
36 unsigned char *outdata) = NULL;
37 void (*crypt_function_send)(unsigned long len, const unsigned char *indata,
38 unsigned char *outdata) = NULL;
39 static RC4_KEY rc4_recv_key;
40 static RC4_KEY rc4_send_key;
41 static unsigned char rc4_buf[2 * RC4_KEY_LEN];
43 extern const char *status_item_list[NUM_STAT_ITEMS];
44 extern struct misc_meta_data *mmd;
45 extern struct gengetopt_args_info conf;
46 extern struct audio_file_selector selectors[];
47 extern struct audio_format afl[];
48 extern struct sender senders[];
49 extern char *user_list;
50 struct sockaddr_in *in_addr;
52 static int com_si(int, int, char **);
53 static int com_version(int, int, char **);
54 static int com_sb(int, int, char **);
55 static int com_sc(int, int, char **);
56 static int com_stat(int, int, char **);
57 static int com_help(int, int, char **);
58 static int com_hup(int, int, char **);
59 static int com_term(int, int, char **);
60 static int com_play(int, int, char **);
61 static int com_stop(int, int, char **);
62 static int com_pause(int, int, char **);
63 static int com_next(int, int, char **);
64 static int com_nomore(int, int, char **);
65 static int com_chs(int, int, char **);
66 static int com_ff(int, int, char **);
67 static int com_jmp(int, int, char **);
68 static int com_sender(int, int, char **);
71 /* commands that are handled by the server itself */
72 static struct server_command cmd_struct[] = {
76 .perms = DB_READ | DB_WRITE,
77 .description = "change the current audio file selector",
78 .synopsis = "chs [new_selector]",
80 "Shutdown the current selector and activate new_selector. If no\n"
81 "argument was given, print the name of the current selector.\n"
87 .perms = AFS_READ | AFS_WRITE,
88 .description = "jmp amount of time forwards or backwards "
89 "in current audio file",
90 .synopsis = "ff n[-]",
93 "\tSet the 'R' (reposition request) bit of the afs status flags\n"
94 "\tand enqueue a request to jump n seconds forwards or backwards\n"
95 "\tin the current audio file.\n"
101 "\tjumps 30 seconds backwards.\n"
109 .description = "print help text",
110 .synopsis = "help [command]",
113 "Without any arguments, help prints a list of availible commands. When\n"
114 "issued with a command name as first argument, print out a description\n"
115 "for that command.\n"
123 .description = "force reload of config file and log file",
127 "After rereading the config file, a signal is sent to all children\n"
128 "which forces them to close/reopen the log file.\n"
135 .perms = AFS_READ | AFS_WRITE,
136 .description = "jmp to given position in current audio file",
137 .synopsis = "jmp [n]",
140 "\tSet the 'R' (reposition request) bit of the afs status flags\n"
141 "\tand enqueue a request to jump to n% of the current audio file,\n"
142 "\twhere 0 <= n <= 100.\n"
149 .perms = AFS_READ | AFS_WRITE,
150 .description = "skip rest of current audio file",
154 "\tSet the 'N' (next audio file) bit of the afs status flags. When\n"
155 "\tplaying, change audio file immediately. Equivalent to stop\n"
156 "\tif paused, NOP if stopped.\n"
163 .handler = com_nomore,
164 .perms = AFS_READ | AFS_WRITE,
165 .description = "stop playing after current audio file",
166 .synopsis = "nomore",
169 "Set the 'O' (no more) bit of the afs status flags. This instructs\n"
170 "para_server to clear the 'P' (playing) bit as soon as it encounters\n"
171 "the 'N' (next audio file) bit being set.\n"
173 "Use this command instead of stop if you don't like\n"
180 .handler = com_pause,
181 .perms = AFS_READ | AFS_WRITE,
182 .description = "pause current audio file",
186 "\tClear the 'P' (playing) bit of the afs status flags.\n"
193 .perms = AFS_READ | AFS_WRITE,
194 .description = "start playing or resume playing when paused",
198 "\tSet the 'P' (playing) bit of the afs status flags. This\n"
199 "\tresults in starting/continuing to stream.\n"
207 .description = "print status bar for current audio file",
208 .synopsis = "sb [n]",
211 "Without any arguments, sb continuously prints a status bar of the form\n"
213 " 12:34 [56:12] (56%) filename\n"
215 "indicating playing time, remaining time, percentage and the name of\n"
216 "the file beeing streamed. Use the optional number n to let stat exit\n"
217 "after having displayed the status bar n times.\n"
224 .description = "print name of audio file whenever it changes",
225 .synopsis = "sc [n]",
228 "\tsc prints exactly one line (the filename of the audio file\n"
229 "\tbeing played) whenever the audio file changes. Stops after\n"
230 "\tn iterations, or never if n is not specified.\n"
235 .handler = com_sender,
236 .perms = AFS_READ | AFS_WRITE,
237 .description = "control paraslash internal senders",
238 .synopsis = "sender [s cmd [arguments]]",
241 "send command cmd to sender s. cmd may be one of the following:\n"
242 "help, on, off, add, delete, allow, or deny. Note that not all senders\n"
243 "support each command. Try e.g. 'para_client sender http help' for\n"
244 "more information about the http sender. If no argument is given,\n"
245 "print out a list of all senders that are compiled in.\n"
252 .description = "print server info",
255 "Print server uptime and other information.\n"
262 .description = "print status info for current audio file",
263 .synopsis = "stat [n]",
266 "\tWithout any arguments, stat continuously prints status messages\n"
267 "\tof the audio file being streamed. Use the optional number n\n"
268 "\tto let stat exit after having displayed status n times.\n"
275 .perms = AFS_READ | AFS_WRITE,
276 .description = "stop playing",
280 "\tClear the 'P' (play) bit and set the 'N' bit of the afs status\n"
287 .perms = AFS_READ | AFS_WRITE,
288 .description = "terminate para_server",
292 "Shuts down the server. Instead of this command, you can also send\n"
293 "SIGINT or SIGTERM. It should never be necessary to send SIGKILL.\n"
298 .handler = com_version,
300 .description = "print server's version",
301 .synopsis = "version",
303 "Show version and other info\n"
305 /* this indicates the end of the list. Do not touch. */
311 static void dummy(__a_unused int s)
314 static void mmd_dup(struct misc_meta_data *new_mmd)
322 * compute human readable string containing
323 * afs_status for given integer value
325 static char *afs_status_tohuman(unsigned int flags)
327 if (flags & AFS_PLAYING)
328 return para_strdup("playing");
329 else if (flags & AFS_NEXT)
330 return para_strdup("stopped");
332 return para_strdup("paused");
336 * return human readable permission string. Never returns NULL.
338 char *cmd_perms_itohuman(unsigned int perms)
340 char *msg = para_malloc(7 * sizeof(char));
342 msg[0] = perms & DB_READ? 'd' : '-';
343 msg[1] = perms & DB_WRITE? 'D' : '-';
344 msg[2] = perms & AFS_READ? 'a' : '-';
345 msg[3] = perms & AFS_WRITE? 'A' : '-';
351 * Never returns NULL.
353 static char *afs_get_status_flags(unsigned int flags)
355 char *msg = para_malloc(5 * sizeof(char));
357 msg[0] = (flags & AFS_PLAYING)? 'P' : '_';
358 msg[1] = (flags & AFS_NOMORE)? 'O' : '_';
359 msg[2] = (flags & AFS_NEXT)? 'N' : '_';
360 msg[3] = (flags & AFS_REPOS)? 'R' : '_';
366 * compute status bar string. Never returns NULL
368 char *get_sb_string(struct misc_meta_data *nmmd)
371 long long unsigned secs = 0, rsecs = 0, percent = 0;
373 base = para_basename(nmmd->filename);
375 return para_strdup("");
378 if (nmmd->chunks_total) {
379 secs = (long long) nmmd->seconds_total * nmmd->chunks_sent
380 / nmmd->chunks_total;
381 rsecs = (long long) nmmd->seconds_total *
382 (nmmd->chunks_total - nmmd->chunks_sent)
383 / nmmd->chunks_total;
384 percent = 100 * ((nmmd->chunks_sent + 5) / 10)
385 / ((nmmd->chunks_total + 5) / 10);
387 ret = make_message("%llu:%02llu [%llu:%02llu] (%llu%%) %s",
388 secs / 60, secs % 60,
389 rsecs / 60, rsecs % 60,
397 static char *get_status(struct misc_meta_data *nmmd)
399 char *bar, *ret, mtime[30] = "";
400 char *status, *flags; /* afs status info */
401 char *ut = uptime_str();
402 long offset = (nmmd->offset + 500) / 1000;
406 if (nmmd->audio_format >= 0) {
407 localtime_r(&nmmd->mtime, &mtime_tm);
408 strftime(mtime, 29, "%a %b %d %Y", &mtime_tm);
410 /* report real status */
411 status = afs_status_tohuman(nmmd->afs_status_flags);
412 flags = afs_get_status_flags(nmmd->afs_status_flags);
413 bar = para_basename(nmmd->filename);
414 gettimeofday(&now, NULL);
416 "%s:%lu\n" "%s:%s\n" "%s:%i\n" "%s:%u\n"
417 "%s:%s\n" "%s:%s\n" "%s:%s\n" "%s:%s\n"
418 "%s:%li\n" "%s:%s\n" "%s" "%s"
419 "%s:%s\n" "%s:%lu.%lu\n" "%s:%lu.%lu\n",
420 status_item_list[SI_FILE_SIZE], nmmd->size / 1024,
421 status_item_list[SI_MTIME], mtime,
422 status_item_list[SI_LENGTH], nmmd->seconds_total,
423 status_item_list[SI_NUM_PLAYED], nmmd->num_played,
425 status_item_list[SI_STATUS_BAR], bar ? bar : "(none)",
426 status_item_list[SI_STATUS], status,
427 status_item_list[SI_STATUS_FLAGS], flags,
428 status_item_list[SI_SELECTOR], selectors[nmmd->selector_num].name,
430 status_item_list[SI_OFFSET], offset,
431 status_item_list[SI_FORMAT], audio_format_name(nmmd->audio_format),
433 nmmd->audio_file_info,
435 status_item_list[SI_UPTIME], ut,
436 status_item_list[SI_STREAM_START],
437 (long unsigned)nmmd->stream_start.tv_sec,
438 (long unsigned)nmmd->stream_start.tv_usec,
439 status_item_list[SI_CURRENT_TIME], now.tv_sec, now.tv_usec
449 static int check_sender_args(int argc, char **argv, struct sender_command_data *scd)
452 /* this has to match sender.h */
453 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
455 scd->sender_num = -1;
457 return -E_COMMAND_SYNTAX;
458 for (i = 0; senders[i].name; i++)
459 if (!strcmp(senders[i].name, argv[1]))
461 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
462 if (!senders[i].name)
463 return -E_COMMAND_SYNTAX;
465 for (i = 0; subcmds[i]; i++)
466 if (!strcmp(subcmds[i], argv[2]))
469 return -E_COMMAND_SYNTAX;
472 if (!senders[scd->sender_num].client_cmds[scd->cmd_num]) {
474 return -E_SENDER_CMD;
477 switch (scd->cmd_num) {
481 return -E_COMMAND_SYNTAX;
485 if (argc != 4 && argc != 5)
486 return -E_COMMAND_SYNTAX;
487 if (!inet_aton(argv[3], &scd->addr))
488 return -E_COMMAND_SYNTAX;
491 scd->netmask = atoi(argv[4]);
492 if (scd->netmask < 0 || scd->netmask > 32)
493 return -E_COMMAND_SYNTAX;
498 if (argc != 4 && argc != 5)
499 return -E_COMMAND_SYNTAX;
500 if (!inet_aton(argv[3], &scd->addr))
501 return -E_COMMAND_SYNTAX;
504 scd->port = atoi(argv[4]);
505 if (scd->port < 0 || scd->port > 65535)
506 return -E_COMMAND_SYNTAX;
510 return -E_COMMAND_SYNTAX;
515 static int com_sender(int fd, int argc, char **argv)
518 struct sender_command_data scd;
522 for (i = 0; senders[i].name; i++) {
523 char *tmp = make_message("%s%s\n",
524 msg? msg : "", senders[i].name);
528 ret = send_buffer(fd, msg);
532 ret = check_sender_args(argc, argv, &scd);
535 if (scd.sender_num < 0)
537 msg = senders[scd.sender_num].help();
538 send_buffer(fd, msg);
542 for (i = 0; i < 10; i++) {
544 if (mmd->sender_cmd_data.cmd_num >= 0) {
549 mmd->sender_cmd_data = scd;
553 return (i < 10)? 1 : -E_LOCK;
557 static int com_si(int fd, int argc, __a_unused char **argv)
561 char *selector_string = NULL, *sender_info = NULL, *sender_list = NULL;
564 return -E_COMMAND_SYNTAX;
566 for (i = 0; selectors[i].name; i++) {
567 selector_string = para_strcat(selector_string, selectors[i].name);
568 selector_string = para_strcat(selector_string, " ");
570 for (i = 0; senders[i].name; i++) {
571 char *info = senders[i].info();
572 sender_info = para_strcat(sender_info, info);
574 sender_list = para_strcat(sender_list, senders[i].name);
575 sender_list = para_strcat(sender_list, " ");
578 ret = send_va_buffer(fd, "up: %s\nplayed: %u\n"
580 "connections (active/accepted/total): %u/%u/%u\n"
581 "current loglevel: %i\n"
582 "supported audio file selectors: %s\n"
583 "supported audio formats: %s\n"
584 "supported senders: %s\n"
588 mmd->active_connections,
593 SUPPORTED_AUDIO_FORMATS,
599 free(selector_string);
606 static int com_version(int socket_fd, int argc, __a_unused char **argv)
609 return -E_COMMAND_SYNTAX;
610 return send_buffer(socket_fd, "para_server-" VERSION ", \"" CODENAME "\"\n"
612 "built: " BUILD_DATE "\n"
613 SYSTEM ", " CC_VERSION "\n"
618 static int com_sc(int socket_fd, int argc, char **argv)
621 int ret, old = 0, count = -1; /* print af change forever */
624 count = atoi(argv[1]);
627 if (old != mmd->num_played) {
628 old = mmd->num_played;
629 name = para_strdup(mmd->filename);
633 ret = send_va_buffer(socket_fd, "%s\n", name);
638 if (argc > 1 && !--count)
646 static int com_sb(int socket_fd, int argc, char **argv)
649 int ret, nr = -1; /* status bar will be printed that many
650 * times. Negative value means: print
657 sb = get_sb_string(mmd);
659 ret = send_va_buffer(socket_fd, "%s\n", sb);
673 static int com_stat(int socket_fd, int argc, char **argv)
675 int ret, num = 0;/* status will be printed that many
676 * times. num <= 0 means: print forever
678 struct misc_meta_data tmp, *nmmd = &tmp;
681 signal(SIGUSR1, dummy);
688 s = get_status(nmmd);
689 ret = send_buffer(socket_fd, s);
696 usleep(500000 * 100);
702 static int send_description(int fd, struct server_command *cmd, const char *handler, int num)
706 for (i = 1; cmd->name && (!num || i <= num); cmd++, i++) {
707 char *perms = cmd_perms_itohuman(cmd->perms);
708 ret = send_va_buffer(fd, "%s\t%s\t%s\t%s\n", cmd->name,
719 /* always returns string that must be freed by the caller in handler */
720 static struct server_command *get_cmd_ptr(char *name, char **handler)
722 struct server_command *cmd = cmd_struct;
724 for (cmd = cmd_struct; cmd->name; cmd++)
725 if (!strcmp(cmd->name, name)) {
727 *handler = para_strdup("para_server"); /* server commands */
730 /* not found, look for commands supported by the current selector */
733 *handler = make_message("the %s selector",
734 selectors[mmd->selector_num].name);
735 cmd = selectors[mmd->selector_num].cmd_list;
737 for (; cmd->name; cmd++)
738 if (!strcmp(cmd->name, name))
744 static int com_help(int fd, int argc, char **argv)
746 struct server_command *cmd;
747 char *perms, *handler;
751 /* no argument given, print list of commands */
752 if ((ret = send_description(fd, cmd_struct, "server", 0)) < 0)
755 handler = para_strdup(selectors[mmd->selector_num].name);
756 cmd = selectors[mmd->selector_num].cmd_list;
758 ret = send_description(fd, cmd, handler, 0);
762 /* argument given for help */
763 cmd = get_cmd_ptr(argv[1], &handler);
768 perms = cmd_perms_itohuman(cmd->perms);
769 ret = send_va_buffer(fd,
771 "SYNOPSIS\n\t para_client %s\n"
774 "This command is handled by %s.\n\n"
776 "Needed privileges for %s: %s\n",
791 static int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv)
794 return -E_COMMAND_SYNTAX;
795 kill(getppid(), SIGHUP);
800 static int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv)
803 return -E_COMMAND_SYNTAX;
804 kill(getppid(), SIGTERM);
808 static int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv)
811 return -E_COMMAND_SYNTAX;
813 mmd->new_afs_status_flags |= AFS_PLAYING;
814 mmd->new_afs_status_flags &= ~AFS_NOMORE;
821 static int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv)
824 return -E_COMMAND_SYNTAX;
826 mmd->new_afs_status_flags &= ~AFS_PLAYING;
827 mmd->new_afs_status_flags &= ~AFS_REPOS;
828 mmd->new_afs_status_flags |= AFS_NEXT;
834 static int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv)
837 return -E_COMMAND_SYNTAX;
841 mmd->new_afs_status_flags &= ~AFS_PLAYING;
842 mmd->new_afs_status_flags &= ~AFS_NEXT;
847 static int com_chs(int fd, int argc, char **argv)
854 selector = para_strdup(selectors[mmd->selector_num].name);
856 ret = send_va_buffer(fd, "%s\n", selector);
860 for (i = 0; selectors[i].name; i++) {
861 if (strcmp(selectors[i].name, argv[1]))
864 mmd->selector_change = i;
869 return -E_BAD_SELECTOR;
873 static int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv)
876 return -E_COMMAND_SYNTAX;
879 mmd->new_afs_status_flags |= AFS_NEXT;
885 static int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv)
888 return -E_COMMAND_SYNTAX;
890 if (afs_playing() || afs_paused())
891 mmd->new_afs_status_flags |= AFS_NOMORE;
897 static int com_ff(__a_unused int socket_fd, int argc, char **argv)
900 int ret, backwards = 0;
905 return -E_COMMAND_SYNTAX;
906 if (!(ret = sscanf(argv[1], "%u%c", &i, &c)))
907 return -E_COMMAND_SYNTAX;
908 if (ret > 1 && c == '-')
909 backwards = 1; /* jmp backwards */
911 ret = -E_NO_AUDIO_FILE;
912 if (!mmd->chunks_total || !mmd->seconds_total)
914 promille = (1000 * mmd->current_chunk) / mmd->chunks_total;
916 promille -= 1000 * i / mmd->seconds_total;
918 promille += 1000 * i / mmd->seconds_total;
921 if (promille > 1000) {
922 mmd->new_afs_status_flags |= AFS_NEXT;
925 mmd->repos_request = (mmd->chunks_total * promille) / 1000;
926 mmd->new_afs_status_flags |= AFS_REPOS;
927 mmd->new_afs_status_flags &= ~AFS_NEXT;
936 static int com_jmp(__a_unused int socket_fd, int argc, char **argv)
942 return -E_COMMAND_SYNTAX;
943 if (sscanf(argv[1], "%lu", &i) <= 0)
944 return -E_COMMAND_SYNTAX;
946 ret = -E_NO_AUDIO_FILE;
947 if (!mmd->chunks_total)
951 PARA_INFO_LOG("jumping to %lu%%\n", i);
952 mmd->repos_request = (mmd->chunks_total * i + 50)/ 100;
953 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
954 mmd->chunks_sent, mmd->offset);
955 mmd->new_afs_status_flags |= AFS_REPOS;
956 mmd->new_afs_status_flags &= ~AFS_NEXT;
965 * check if perms are sufficient to exec a command having perms cmd_perms.
966 * Returns 0 if perms are sufficient, -E_PERM otherwise.
968 static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
970 PARA_DEBUG_LOG("%s", "checking permissions\n");
971 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
975 * Parse first string from *cmd and lookup in table of valid commands.
976 * On error, NULL is returned.
978 static struct server_command *parse_cmd(const char *cmdstr)
983 sscanf(cmdstr, "%200s%n", buf, &n);
987 return get_cmd_ptr(buf, NULL);
990 long int para_rand(long unsigned max)
992 return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
995 /* Open user_list file, returns pointer to opened file on success,
998 static FILE *open_user_list(char *file)
1000 PARA_DEBUG_LOG("opening user list %s\n", file);
1001 return fopen(file, "r");
1005 * lookup user in user_list file. Fills in a user struct containing
1006 * filename of the user's public key as well as the permissions of that user.
1007 * Returns 1 on success, 0 if user does not exist and < 0 on errors.
1009 static int get_user(struct user *user) {
1013 /* keyword, user, key, perms */
1014 char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
1017 file_ptr = open_user_list(user_list);
1020 while (fgets(line, MAXLINE, file_ptr)) {
1021 // PARA_DEBUG_LOG("%s: Read line (%i bytes) "
1022 // "from config file\n", __func__, strlen(line));
1023 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
1025 if (!strcmp(w, "user") && !strcmp(user->name, n)) {
1026 PARA_DEBUG_LOG("found entry for %s\n", n);
1027 strcpy(user->name, n);
1028 strcpy(user->pubkey_file, k);
1031 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
1032 tmp[0], tmp[1], tmp[2], tmp[3]);
1033 PARA_DEBUG_LOG("found %i perm entries\n",
1038 //PARA_DEBUG_LOG("%s: tmp[%i]=%s\n", __func__,
1040 if (!strcmp(tmp[num], "AFS_READ"))
1042 user->perms | AFS_READ;
1043 else if (!strcmp(tmp[num], "AFS_WRITE"))
1045 user->perms | AFS_WRITE;
1046 else if (!strcmp(tmp[num], "DB_READ"))
1047 user->perms = user->perms | DB_READ;
1048 else if (!strcmp(tmp[num], "DB_WRITE"))
1049 user->perms = user->perms | DB_WRITE;
1050 else /* unknown permission */
1051 PARA_WARNING_LOG("unknown permission:"
1062 static void init_rc4_keys(void)
1066 for (i = 0; i < 2 * RC4_KEY_LEN; i++)
1067 rc4_buf[i] = para_rand(256);
1068 PARA_DEBUG_LOG("rc4 keys initialized (%u:%u)\n",
1069 (unsigned char) rc4_buf[0],
1070 (unsigned char) rc4_buf[RC4_KEY_LEN]);
1071 RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf);
1072 RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
1075 static void rc4_recv(unsigned long len, const unsigned char *indata, unsigned char *outdata)
1077 RC4(&rc4_recv_key, len, indata, outdata);
1080 static void rc4_send(unsigned long len, const unsigned char *indata, unsigned char *outdata)
1082 RC4(&rc4_send_key, len, indata, outdata);
1085 int handle_connect(int fd, struct sockaddr_in *addr)
1087 int numbytes, ret, argc, use_rc4 = 0;
1088 char buf[STRINGSIZE];
1089 unsigned char crypt_buf[MAXLINE];
1091 struct server_command *cmd = NULL;
1092 long unsigned challenge_nr, chall_response;
1094 char *p, *command = NULL;
1096 signal(SIGCHLD, SIG_IGN);
1097 signal(SIGINT, SIG_DFL);
1098 signal(SIGTERM, SIG_DFL);
1099 signal(SIGHUP, SIG_DFL);
1100 signal(SIGUSR1, SIG_IGN);
1103 challenge_nr = random();
1104 /* send Welcome message */
1105 ret = send_va_buffer(fd, "This is para_server, version " VERSION ".\n" );
1108 /* recv auth request line */
1109 ret = recv_buffer(fd, buf, sizeof(buf));
1118 if (strncmp(buf, "auth ", 5))
1121 if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9))
1122 strcpy(u.name, buf + 5); /* client version < 0.2.6 */
1124 strcpy(u.name, buf + 9); /* client version >= 0.2.6 */
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)
1133 if (!ret) { /* user not found */
1134 PARA_WARNING_LOG("auth request for unknown user %s\n", u.name);
1138 ret = para_encrypt_challenge(u.pubkey_file, challenge_nr, crypt_buf);
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);
1147 /* recv decrypted number */
1148 numbytes = recv_buffer(fd, buf, sizeof(buf));
1155 if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1
1156 || chall_response != challenge_nr)
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);
1163 ret = para_encrypt_buffer(u.pubkey_file, rc4_buf, 2 * RC4_KEY_LEN,
1164 (unsigned char *)buf + PROCEED_MSG_LEN + 1);
1167 numbytes = ret + strlen(PROCEED_MSG) + 1;
1169 numbytes = strlen(buf);
1170 ret = send_bin_buffer(fd, buf, numbytes);
1174 crypt_function_recv = rc4_recv;
1175 crypt_function_send = rc4_send;
1176 PARA_INFO_LOG("%s", "rc4 encrytion activated\n");
1179 while ((numbytes = recv_buffer(fd, buf, sizeof(buf))) > 0) {
1180 // PARA_INFO_LOG("recvd: %s (%d)\n", buf, numbytes);
1181 ret = -E_COMMAND_SYNTAX;
1182 if (command && numbytes + strlen(command) > STRINGSIZE) /* DOS */
1184 command = para_strcat(command, buf);
1185 if ((p = strstr(command, EOC_MSG))) {
1195 if (!(cmd = parse_cmd(command)))
1197 /* valid command, check permissions */
1198 ret = check_perms(u.perms, cmd);
1201 /* valid command and sufficient perms */
1203 argc = split_args(command, &argv, "\n");
1205 mmd->num_commands++;
1207 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u.name,
1208 inet_ntoa(addr->sin_addr));
1209 ret = cmd->handler(fd, argc, argv);
1215 if (ret != -E_SEND && ret != -E_RECV) {
1216 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
1217 send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret));
1224 if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
1226 mmd->active_connections--;