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], nmmd->stream_start.tv_sec,
437 nmmd->stream_start.tv_usec,
438 status_item_list[SI_CURRENT_TIME], now.tv_sec, now.tv_usec
448 static int check_sender_args(int argc, char **argv, struct sender_command_data *scd)
451 /* this has to match sender.h */
452 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
454 scd->sender_num = -1;
456 return -E_COMMAND_SYNTAX;
457 for (i = 0; senders[i].name; i++)
458 if (!strcmp(senders[i].name, argv[1]))
460 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
461 if (!senders[i].name)
462 return -E_COMMAND_SYNTAX;
464 for (i = 0; subcmds[i]; i++)
465 if (!strcmp(subcmds[i], argv[2]))
468 return -E_COMMAND_SYNTAX;
471 if (!senders[scd->sender_num].client_cmds[scd->cmd_num]) {
473 return -E_SENDER_CMD;
476 switch (scd->cmd_num) {
480 return -E_COMMAND_SYNTAX;
484 if (argc != 4 && argc != 5)
485 return -E_COMMAND_SYNTAX;
486 if (!inet_aton(argv[3], &scd->addr))
487 return -E_COMMAND_SYNTAX;
490 scd->netmask = atoi(argv[4]);
491 if (scd->netmask < 0 || scd->netmask > 32)
492 return -E_COMMAND_SYNTAX;
497 if (argc != 4 && argc != 5)
498 return -E_COMMAND_SYNTAX;
499 if (!inet_aton(argv[3], &scd->addr))
500 return -E_COMMAND_SYNTAX;
503 scd->port = atoi(argv[4]);
504 if (scd->port < 0 || scd->port > 65535)
505 return -E_COMMAND_SYNTAX;
509 return -E_COMMAND_SYNTAX;
514 static int com_sender(int fd, int argc, char **argv)
517 struct sender_command_data scd;
521 for (i = 0; senders[i].name; i++) {
522 char *tmp = make_message("%s%s\n",
523 msg? msg : "", senders[i].name);
527 ret = send_buffer(fd, msg);
531 ret = check_sender_args(argc, argv, &scd);
534 if (scd.sender_num < 0)
536 msg = senders[scd.sender_num].help();
537 send_buffer(fd, msg);
541 for (i = 0; i < 10; i++) {
543 if (mmd->sender_cmd_data.cmd_num >= 0) {
548 mmd->sender_cmd_data = scd;
552 return (i < 10)? 1 : -E_LOCK;
556 static int com_si(int fd, int argc, __a_unused char **argv)
560 char *selector_string = NULL, *sender_info = NULL, *sender_list = NULL;
563 return -E_COMMAND_SYNTAX;
565 for (i = 0; selectors[i].name; i++) {
566 selector_string = para_strcat(selector_string, selectors[i].name);
567 selector_string = para_strcat(selector_string, " ");
569 for (i = 0; senders[i].name; i++) {
570 char *info = senders[i].info();
571 sender_info = para_strcat(sender_info, info);
573 sender_list = para_strcat(sender_list, senders[i].name);
574 sender_list = para_strcat(sender_list, " ");
577 ret = send_va_buffer(fd, "up: %s\nplayed: %u\n"
579 "connections (active/accepted/total): %u/%u/%u\n"
580 "current loglevel: %i\n"
581 "supported audio file selectors: %s\n"
582 "supported audio formats: %s\n"
583 "supported senders: %s\n"
587 mmd->active_connections,
592 SUPPORTED_AUDIO_FORMATS,
598 free(selector_string);
605 static int com_version(int socket_fd, int argc, __a_unused char **argv)
608 return -E_COMMAND_SYNTAX;
609 return send_buffer(socket_fd, "para_server-" VERSION ", \"" CODENAME "\"\n"
611 "built: " BUILD_DATE "\n"
612 SYSTEM ", " CC_VERSION "\n"
617 static int com_sc(int socket_fd, int argc, char **argv)
620 int ret, old = 0, count = -1; /* print af change forever */
623 count = atoi(argv[1]);
626 if (old != mmd->num_played) {
627 old = mmd->num_played;
628 name = para_strdup(mmd->filename);
632 ret = send_va_buffer(socket_fd, "%s\n", name);
637 if (argc > 1 && !--count)
645 static int com_sb(int socket_fd, int argc, char **argv)
648 int ret, nr = -1; /* status bar will be printed that many
649 * times. Negative value means: print
656 sb = get_sb_string(mmd);
658 ret = send_va_buffer(socket_fd, "%s\n", sb);
672 static int com_stat(int socket_fd, int argc, char **argv)
674 int ret, num = 0;/* status will be printed that many
675 * times. num <= 0 means: print forever
677 struct misc_meta_data tmp, *nmmd = &tmp;
680 signal(SIGUSR1, dummy);
687 s = get_status(nmmd);
688 ret = send_buffer(socket_fd, s);
695 usleep(500000 * 100);
701 static int send_description(int fd, struct server_command *cmd, const char *handler, int num)
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,
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)
721 struct server_command *cmd = cmd_struct;
723 for (cmd = cmd_struct; cmd->name; cmd++)
724 if (!strcmp(cmd->name, name)) {
726 *handler = para_strdup("para_server"); /* server commands */
729 /* not found, look for commands supported by the current selector */
732 *handler = make_message("the %s selector",
733 selectors[mmd->selector_num].name);
734 cmd = selectors[mmd->selector_num].cmd_list;
736 for (; cmd->name; cmd++)
737 if (!strcmp(cmd->name, name))
743 static int com_help(int fd, int argc, char **argv)
745 struct server_command *cmd;
746 char *perms, *handler;
750 /* no argument given, print list of commands */
751 if ((ret = send_description(fd, cmd_struct, "server", 0)) < 0)
754 handler = para_strdup(selectors[mmd->selector_num].name);
755 cmd = selectors[mmd->selector_num].cmd_list;
757 ret = send_description(fd, cmd, handler, 0);
761 /* argument given for help */
762 cmd = get_cmd_ptr(argv[1], &handler);
767 perms = cmd_perms_itohuman(cmd->perms);
768 ret = send_va_buffer(fd,
770 "SYNOPSIS\n\t para_client %s\n"
773 "This command is handled by %s.\n\n"
775 "Needed privileges for %s: %s\n",
790 static int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv)
793 return -E_COMMAND_SYNTAX;
794 kill(getppid(), SIGHUP);
799 static int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv)
802 return -E_COMMAND_SYNTAX;
803 kill(getppid(), SIGTERM);
807 static int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv)
810 return -E_COMMAND_SYNTAX;
812 mmd->new_afs_status_flags |= AFS_PLAYING;
813 mmd->new_afs_status_flags &= ~AFS_NOMORE;
820 static int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv)
823 return -E_COMMAND_SYNTAX;
825 mmd->new_afs_status_flags &= ~AFS_PLAYING;
826 mmd->new_afs_status_flags &= ~AFS_REPOS;
827 mmd->new_afs_status_flags |= AFS_NEXT;
833 static int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv)
836 return -E_COMMAND_SYNTAX;
840 mmd->new_afs_status_flags &= ~AFS_PLAYING;
841 mmd->new_afs_status_flags &= ~AFS_NEXT;
846 static int com_chs(int fd, int argc, char **argv)
853 selector = para_strdup(selectors[mmd->selector_num].name);
855 ret = send_va_buffer(fd, "%s\n", selector);
859 for (i = 0; selectors[i].name; i++) {
860 if (strcmp(selectors[i].name, argv[1]))
863 mmd->selector_change = i;
868 return -E_BAD_SELECTOR;
872 static int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv)
875 return -E_COMMAND_SYNTAX;
878 mmd->new_afs_status_flags |= AFS_NEXT;
884 static int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv)
887 return -E_COMMAND_SYNTAX;
889 if (afs_playing() || afs_paused())
890 mmd->new_afs_status_flags |= AFS_NOMORE;
896 static int com_ff(__a_unused int socket_fd, int argc, char **argv)
899 int ret, backwards = 0;
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 */
910 ret = -E_NO_AUDIO_FILE;
911 if (!mmd->chunks_total || !mmd->seconds_total)
913 promille = (1000 * mmd->current_chunk) / mmd->chunks_total;
915 promille -= 1000 * i / mmd->seconds_total;
917 promille += 1000 * i / mmd->seconds_total;
920 if (promille > 1000) {
921 mmd->new_afs_status_flags |= AFS_NEXT;
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;
935 static int com_jmp(__a_unused int socket_fd, int argc, char **argv)
941 return -E_COMMAND_SYNTAX;
942 if (sscanf(argv[1], "%lu", &i) <= 0)
943 return -E_COMMAND_SYNTAX;
945 ret = -E_NO_AUDIO_FILE;
946 if (!mmd->chunks_total)
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;
964 * check if perms are sufficient to exec a command having perms cmd_perms.
965 * Returns 0 if perms are sufficient, -E_PERM otherwise.
967 static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
969 PARA_DEBUG_LOG("%s", "checking permissions\n");
970 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
974 * Parse first string from *cmd and lookup in table of valid commands.
975 * On error, NULL is returned.
977 static struct server_command *parse_cmd(const char *cmdstr)
982 sscanf(cmdstr, "%200s%n", buf, &n);
986 return get_cmd_ptr(buf, NULL);
989 long int para_rand(long unsigned max)
991 return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
994 /* Open user_list file, returns pointer to opened file on success,
997 static FILE *open_user_list(char *file)
999 PARA_DEBUG_LOG("opening user list %s\n", file);
1000 return fopen(file, "r");
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.
1008 static int get_user(struct user *user) {
1012 /* keyword, user, key, perms */
1013 char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
1016 file_ptr = open_user_list(user_list);
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)
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);
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",
1037 //PARA_DEBUG_LOG("%s: tmp[%i]=%s\n", __func__,
1039 if (!strcmp(tmp[num], "AFS_READ"))
1041 user->perms | AFS_READ;
1042 else if (!strcmp(tmp[num], "AFS_WRITE"))
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:"
1061 static void init_rc4_keys(void)
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);
1074 static void rc4_recv(unsigned long len, const unsigned char *indata, unsigned char *outdata)
1076 RC4(&rc4_recv_key, len, indata, outdata);
1079 static void rc4_send(unsigned long len, const unsigned char *indata, unsigned char *outdata)
1081 RC4(&rc4_send_key, len, indata, outdata);
1084 int handle_connect(int fd, struct sockaddr_in *addr)
1086 int numbytes, ret, argc, use_rc4 = 0;
1087 char buf[STRINGSIZE];
1088 unsigned char crypt_buf[MAXLINE];
1090 struct server_command *cmd = NULL;
1091 long unsigned challenge_nr, chall_response;
1093 char *p, *command = NULL;
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);
1102 challenge_nr = random();
1103 /* send Welcome message */
1104 ret = send_va_buffer(fd, "This is para_server, version " VERSION ".\n" );
1107 /* recv auth request line */
1108 ret = recv_buffer(fd, buf, sizeof(buf));
1117 if (strncmp(buf, "auth ", 5))
1120 if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9))
1121 strcpy(u.name, buf + 5); /* client version < 0.2.6 */
1123 strcpy(u.name, buf + 9); /* client version >= 0.2.6 */
1126 // strcpy(u.name, buf + 5); /* ok, but ugly */
1127 PARA_DEBUG_LOG("received %s request for user %s\n",
1128 use_rc4? "rc4" : "auth", u.name);
1129 /* lookup user in list file */
1130 if ((ret = get_user(&u)) < 0)
1132 if (!ret) { /* user not found */
1133 PARA_WARNING_LOG("auth request for unknown user %s\n", u.name);
1137 ret = para_encrypt_challenge(u.pubkey_file, challenge_nr, crypt_buf);
1141 PARA_DEBUG_LOG("sending %d byte challenge\n", numbytes);
1142 /* We can't use send_buffer here since buf may contain null bytes */
1143 ret = send_bin_buffer(fd,(char *) crypt_buf, numbytes);
1146 /* recv decrypted number */
1147 numbytes = recv_buffer(fd, buf, sizeof(buf));
1154 if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1
1155 || chall_response != challenge_nr)
1157 /* auth successful. Send 'Proceed' message */
1158 PARA_INFO_LOG("good auth for %s (%lu)\n", u.name, challenge_nr);
1159 sprintf(buf, "%s", PROCEED_MSG);
1162 ret = para_encrypt_buffer(u.pubkey_file, rc4_buf, 2 * RC4_KEY_LEN,
1163 (unsigned char *)buf + PROCEED_MSG_LEN + 1);
1166 numbytes = ret + strlen(PROCEED_MSG) + 1;
1168 numbytes = strlen(buf);
1169 ret = send_bin_buffer(fd, buf, numbytes);
1173 crypt_function_recv = rc4_recv;
1174 crypt_function_send = rc4_send;
1175 PARA_INFO_LOG("%s", "rc4 encrytion activated\n");
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 */
1183 command = para_strcat(command, buf);
1184 if ((p = strstr(command, EOC_MSG))) {
1194 if (!(cmd = parse_cmd(command)))
1196 /* valid command, check permissions */
1197 ret = check_perms(u.perms, cmd);
1200 /* valid command and sufficient perms */
1202 argc = split_args(command, &argv, "\n");
1204 mmd->num_commands++;
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);
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));
1223 if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
1225 mmd->active_connections--;