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 */
22 #include <malloc.h> /* mallinfo */
23 #include <sys/time.h> /* gettimeofday */
25 #include "server.cmdline.h"
31 #include <openssl/rc4.h>
37 void (*crypt_function_recv)(unsigned long len, const unsigned char *indata,
38 unsigned char *outdata) = NULL;
39 void (*crypt_function_send)(unsigned long len, const unsigned char *indata,
40 unsigned char *outdata) = NULL;
41 static RC4_KEY rc4_recv_key;
42 static RC4_KEY rc4_send_key;
43 static unsigned char rc4_buf[2 * RC4_KEY_LEN];
45 extern const char *status_item_list[NUM_STAT_ITEMS];
46 extern struct misc_meta_data *mmd;
47 extern struct gengetopt_args_info conf;
48 extern struct dbtool dblist[];
49 extern struct audio_format afl[];
50 extern struct sender senders[];
51 extern char *user_list;
52 struct sockaddr_in *in_addr;
54 static int com_si(int, int, char **);
55 static int com_version(int, int, char **);
56 static int com_sb(int, int, char **);
57 static int com_sc(int, int, char **);
58 static int com_stat(int, int, char **);
59 static int com_help(int, int, char **);
60 static int com_hup(int, int, char **);
61 static int com_term(int, int, char **);
62 static int com_play(int, int, char **);
63 static int com_stop(int, int, char **);
64 static int com_pause(int, int, char **);
65 static int com_next(int, int, char **);
66 static int com_nomore(int, int, char **);
67 static int com_cdt(int, int, char **);
68 static int com_ff(int, int, char **);
69 static int com_jmp(int, int, char **);
70 static int com_sender(int, int, char **);
73 /* commands that are handled by the server itself */
74 static struct server_command cmd_struct[] = {
78 .perms = DB_READ | DB_WRITE,
79 .description = "change database tool",
80 .synopsis = "cdt [name_of_new_dbtool]",
82 "Deactivate current dbtool and activate name_of_new_dbtool. If no\n"
83 "argument was given, print the current database tool.\n"
89 .perms = AFS_READ | AFS_WRITE,
90 .description = "jmp amount of time forwards or backwards "
91 "in current audio file",
92 .synopsis = "ff n[-]",
95 "\tSet the 'R' (reposition request) bit of the afs status flags\n"
96 "\tand enqueue a request to jump n seconds forwards or backwards\n"
97 "\tin the current audio file.\n"
103 "\tjumps 30 seconds backwards.\n"
111 .description = "print help text",
112 .synopsis = "help [command]",
115 "Without any arguments, help prints a list of availible commands. When\n"
116 "issued with a command name as first argument, print out a description\n"
117 "for that command.\n"
125 .description = "force reload of config file and log file",
129 "After rereading the config file, a signal is sent to all children\n"
130 "which forces them to close/reopen the log file.\n"
137 .perms = AFS_READ | AFS_WRITE,
138 .description = "jmp to given position in current audio file",
139 .synopsis = "jmp [n]",
142 "\tSet the 'R' (reposition request) bit of the afs status flags\n"
143 "\tand enqueue a request to jump to n% of the current audio file,\n"
144 "\twhere 0 <= n <= 100.\n"
151 .perms = AFS_READ | AFS_WRITE,
152 .description = "skip rest of current audio file",
156 "\tSet the 'N' (next audio file) bit of the afs status flags. When\n"
157 "\tplaying, change audio file immediately. Equivalent to stop\n"
158 "\tif paused, NOP if stopped.\n"
165 .handler = com_nomore,
166 .perms = AFS_READ | AFS_WRITE,
167 .description = "stop playing after current audio file",
168 .synopsis = "nomore",
171 "Set the 'O' (no more) bit of the afs status flags. This instructs\n"
172 "para_server to clear the 'P' (playing) bit as soon as it encounters\n"
173 "the 'N' (next audio file) bit being set.\n"
175 "Use this command instead of stop if you don't like\n"
182 .handler = com_pause,
183 .perms = AFS_READ | AFS_WRITE,
184 .description = "pause current audio file",
188 "\tClear the 'P' (playing) bit of the afs status flags.\n"
195 .perms = AFS_READ | AFS_WRITE,
196 .description = "start playing or resume playing when paused",
200 "\tSet the 'P' (playing) bit of the afs status flags. This\n"
201 "\tresults in starting/continuing to stream.\n"
209 .description = "print status bar for current audio file",
210 .synopsis = "sb [n]",
213 "Without any arguments, sb continuously prints a status bar of the form\n"
215 " 12:34 [56:12] (56%) filename\n"
217 "indicating playing time, remaining time, percentage and the name of\n"
218 "the file beeing streamed. Use the optional number n to let stat exit\n"
219 "after having displayed the status bar n times.\n"
226 .description = "print name of audio file whenever it changes",
227 .synopsis = "sc [n]",
230 "\tsc prints exactly one line (the filename of the audio file\n"
231 "\tbeing played) whenever the audio file changes. Stops after\n"
232 "\tn iterations, or never if n is not specified.\n"
237 .handler = com_sender,
238 .perms = AFS_READ | AFS_WRITE,
239 .description = "control paraslash internal senders",
240 .synopsis = "sender [s cmd [arguments]]",
243 "send command cmd to sender s. cmd may be one of the following:\n"
244 "help, on, off, add, delete, allow, or deny. Note that not all senders\n"
245 "support each command. Try e.g. 'para_client sender http help' for\n"
246 "more information about the http sender. If no argument is given,\n"
247 "print out a list of all senders that are compiled in.\n"
254 .description = "print server info",
257 "Print server uptime and other information.\n"
264 .description = "print status info for current audio file",
265 .synopsis = "stat [n]",
268 "\tWithout any arguments, stat continuously prints status messages\n"
269 "\tof the audio file being streamed. Use the optional number n\n"
270 "\tto let stat exit after having displayed status n times.\n"
277 .perms = AFS_READ | AFS_WRITE,
278 .description = "stop playing",
282 "\tClear the 'P' (play) bit and set the 'N' bit of the afs status\n"
289 .perms = AFS_READ | AFS_WRITE,
290 .description = "terminate para_server",
294 "Shuts down the server. Instead of this command, you can also send\n"
295 "SIGINT or SIGTERM. It should never be necessary to send SIGKILL.\n"
300 .handler = com_version,
302 .description = "print server's version",
303 .synopsis = "version",
305 "Show version and other info\n"
307 /* this indicates the end of the list. Do not touch. */
313 static void dummy(__unused int s)
316 static void mmd_dup(struct misc_meta_data *new_mmd)
324 * compute human readable string containing
325 * afs_status for given integer value
327 static char *afs_status_tohuman(unsigned int flags)
329 if (flags & AFS_PLAYING)
330 return para_strdup("playing");
331 else if (flags & AFS_NEXT)
332 return para_strdup("stopped");
334 return para_strdup("paused");
339 * return human readable permission string. Never returns NULL.
341 char *cmd_perms_itohuman(unsigned int perms)
343 char *msg = para_malloc(7 * sizeof(char));
345 msg[0] = perms & DB_READ? 'd' : '-';
346 msg[1] = perms & DB_WRITE? 'D' : '-';
347 msg[2] = perms & AFS_READ? 'a' : '-';
348 msg[3] = perms & AFS_WRITE? 'A' : '-';
354 * Never returns NULL.
356 static char *afs_get_status_flags(unsigned int flags)
358 char *msg = para_malloc(5 * sizeof(char));
360 msg[0] = (flags & AFS_PLAYING)? 'P' : '_';
361 msg[1] = (flags & AFS_NOMORE)? 'O' : '_';
362 msg[2] = (flags & AFS_NEXT)? 'N' : '_';
363 msg[3] = (flags & AFS_REPOS)? 'R' : '_';
369 * compute status bar string. Never returns NULL
371 char *get_sb_string(struct misc_meta_data *nmmd)
374 long long unsigned secs = 0, rsecs = 0, percent = 0;
376 base = para_basename(nmmd->filename);
378 return para_strdup("");
381 if (nmmd->chunks_total) {
382 secs = (long long) nmmd->seconds_total * nmmd->chunks_sent
383 / nmmd->chunks_total;
384 rsecs = (long long) nmmd->seconds_total *
385 (nmmd->chunks_total - nmmd->chunks_sent)
386 / nmmd->chunks_total;
387 percent = 100 * ((nmmd->chunks_sent + 5) / 10)
388 / ((nmmd->chunks_total + 5) / 10);
390 ret = make_message("%llu:%02llu [%llu:%02llu] (%llu%%) %s",
391 secs / 60, secs % 60,
392 rsecs / 60, rsecs % 60,
400 static char *get_status(struct misc_meta_data *nmmd)
402 char *bar, *ret, mtime[30] = "";
403 char *status, *flags; /* afs status info */
404 char *ut = uptime_str();
405 long offset = (nmmd->offset + 500) / 1000;
409 if (nmmd->audio_format >= 0) {
410 localtime_r(&nmmd->mtime, &mtime_tm);
411 strftime(mtime, 29, "%a %b %d %Y", &mtime_tm);
413 /* report real status */
414 status = afs_status_tohuman(nmmd->afs_status_flags);
415 flags = afs_get_status_flags(nmmd->afs_status_flags);
416 bar = para_basename(nmmd->filename);
417 gettimeofday(&now, NULL);
419 "%s:%lu\n" "%s:%s\n" "%s:%i\n" "%s:%u\n"
420 "%s:%s\n" "%s:%s\n" "%s:%s\n" "%s:%s\n"
421 "%s:%li\n" "%s:%s\n" "%s" "%s"
422 "%s:%s\n" "%s:%lu.%lu\n" "%s:%lu.%lu\n",
423 status_item_list[SI_FILE_SIZE], nmmd->size / 1024,
424 status_item_list[SI_MTIME], mtime,
425 status_item_list[SI_LENGTH], nmmd->seconds_total,
426 status_item_list[SI_NUM_PLAYED], nmmd->num_played,
428 status_item_list[SI_STATUS_BAR], bar ? bar : "(none)",
429 status_item_list[SI_STATUS], status,
430 status_item_list[SI_STATUS_FLAGS], flags,
431 status_item_list[SI_DBTOOL], dblist[nmmd->dbt_num].name,
433 status_item_list[SI_OFFSET], offset,
434 status_item_list[SI_FORMAT], audio_format_name(nmmd->audio_format),
436 nmmd->audio_file_info,
438 status_item_list[SI_UPTIME], ut,
439 status_item_list[SI_STREAM_START], nmmd->stream_start.tv_sec,
440 nmmd->stream_start.tv_usec,
441 status_item_list[SI_CURRENT_TIME], now.tv_sec, now.tv_usec
451 static int check_sender_args(int argc, char **argv, struct sender_command_data *scd)
454 /* this has to match sender.h */
455 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
457 scd->sender_num = -1;
459 return -E_COMMAND_SYNTAX;
460 for (i = 0; senders[i].name; i++)
461 if (!strcmp(senders[i].name, argv[0]))
463 // PARA_DEBUG_LOG("%d:%s\n", argc, argv[0]);
464 if (!senders[i].name)
465 return -E_COMMAND_SYNTAX;
467 for (i = 0; subcmds[i]; i++)
468 if (!strcmp(subcmds[i], argv[1]))
471 return -E_COMMAND_SYNTAX;
473 // scd->self = *in_addr;
475 if (!senders[scd->sender_num].client_cmds[scd->cmd_num]) {
477 return -E_SENDER_CMD;
480 switch (scd->cmd_num) {
484 return -E_COMMAND_SYNTAX;
488 if (argc != 2 && argc != 3)
489 return -E_COMMAND_SYNTAX;
490 if (!inet_aton(argv[2], &scd->addr))
491 return -E_COMMAND_SYNTAX;
494 scd->netmask = atoi(argv[3]);
495 if (scd->netmask < 0 || scd->netmask > 32)
496 return -E_COMMAND_SYNTAX;
501 if (argc != 2 && argc != 3)
502 return -E_COMMAND_SYNTAX;
503 if (!inet_aton(argv[2], &scd->addr))
504 return -E_COMMAND_SYNTAX;
507 scd->port = atoi(argv[3]);
508 if (scd->port < 0 || scd->port > 65535)
509 return -E_COMMAND_SYNTAX;
513 return -E_COMMAND_SYNTAX;
518 static int com_sender(int fd, int argc, char **argv)
521 struct sender_command_data scd;
525 for (i = 0; senders[i].name; i++) {
526 char *tmp = make_message("%s%s\n",
527 msg? msg : "", senders[i].name);
531 ret = send_buffer(fd, msg);
535 ret = check_sender_args(argc - 1, argv + 1, &scd);
538 if (scd.sender_num < 0)
540 msg = senders[scd.sender_num].help();
541 send_buffer(fd, msg);
545 for (i = 0; i < 10; i++) {
547 if (mmd->sender_cmd_data.cmd_num >= 0) {
552 mmd->sender_cmd_data = scd;
556 return (i < 10)? 1 : -E_LOCK;
560 static int com_si(int fd, int argc, __unused char **argv)
564 char *dbtools = NULL, *sender_info = NULL, *sender_list = NULL;
565 struct mallinfo mi = mallinfo();
568 return -E_COMMAND_SYNTAX;
570 for (i = 0; dblist[i].name; i++) {
571 dbtools = para_strcat(dbtools, dblist[i].name);
572 dbtools = para_strcat(dbtools, " ");
574 for (i = 0; senders[i].name; i++) {
575 char *info = senders[i].info();
576 sender_info = para_strcat(sender_info, info);
578 sender_list = para_strcat(sender_list, senders[i].name);
579 sender_list = para_strcat(sender_list, " ");
582 ret = send_va_buffer(fd, "up: %s\nplayed: %u\n"
585 "connections (active/accepted/total): %u/%u/%u\n"
586 "current loglevel: %i\n"
587 "supported database tools: %s\n"
588 "supported audio formats: %s\n"
589 "supported senders: %s\n"
594 mmd->active_connections,
599 SUPPORTED_AUDIO_FORMATS,
612 static int com_version(int socket_fd, int argc, __unused char **argv)
615 return -E_COMMAND_SYNTAX;
616 return send_buffer(socket_fd, "para_server-" VERSION ", \"" CODENAME "\"\n"
618 "built: " BUILD_DATE "\n"
619 SYSTEM ", " CC_VERSION "\n"
624 static int com_sc(int socket_fd, int argc, char **argv)
627 int ret, old = 0, count = -1; /* print af change forever */
630 count = atoi(argv[1]);
633 if (old != mmd->num_played) {
634 old = mmd->num_played;
635 name = para_strdup(mmd->filename);
639 ret = send_va_buffer(socket_fd, "%s\n", name);
644 if (argc && !--count)
652 static int com_sb(int socket_fd, int argc, char **argv)
655 int ret, nr = -1; /* status bar will be printed that many
656 * times. Negative value means: print
663 sb = get_sb_string(mmd);
665 ret = send_va_buffer(socket_fd, "%s\n", sb);
679 static int com_stat(int socket_fd, int argc, char **argv)
681 // char *old_stat = NULL, *old_dbinfo = NULL;
682 int ret, num = 0;/* status will be printed that many
683 * times. num <= 0 means: print forever
685 struct misc_meta_data tmp, *nmmd = &tmp;
688 signal(SIGUSR1, dummy);
695 s = get_status(nmmd);
696 ret = send_buffer(socket_fd, s);
703 usleep(500000 * 100);
709 static int send_description(int fd, struct server_command *cmd, const char *handler, int num)
713 for (i = 1; cmd->name && (!num || i <= num); cmd++, i++) {
714 char *perms = cmd_perms_itohuman(cmd->perms);
715 ret = send_va_buffer(fd, "%s\t%s\t%s\t%s\n", cmd->name,
726 /* always returns string that must be freed by the caller in handeler */
727 static struct server_command *get_cmd_ptr(char *name, char **handler)
729 struct server_command *cmd = cmd_struct;
731 for (cmd = cmd_struct; cmd->name; cmd++)
732 if (!strcmp(cmd->name, name)) {
734 *handler = para_strdup("para_server"); /* server commands */
737 /* not found, look for dbtool commands */
740 *handler = make_message("the %s database tool", dblist[mmd->dbt_num].name);
741 cmd = dblist[mmd->dbt_num].cmd_list;
743 for (; cmd->name; cmd++)
744 if (!strcmp(cmd->name, name))
750 static int com_help(int fd, int argc, char **argv)
752 struct server_command *cmd;
753 char *perms, *handler;
757 /* no argument given, print list of commands */
758 if ((ret = send_description(fd, cmd_struct, "server", 0)) < 0)
761 handler = para_strdup(dblist[mmd->dbt_num].name);
762 cmd = dblist[mmd->dbt_num].cmd_list;
764 ret = send_description(fd, cmd, handler, 0);
768 /* argument given for help */
769 cmd = get_cmd_ptr(argv[1], &handler);
774 perms = cmd_perms_itohuman(cmd->perms);
775 ret = send_va_buffer(fd,
777 "SYNOPSIS\n\t para_client %s\n"
780 "This command is handled by %s.\n\n"
782 "Needed privileges for %s: %s\n",
797 static int com_hup(__unused int socket_fd, int argc, __unused char **argv)
800 return -E_COMMAND_SYNTAX;
801 kill(getppid(), SIGHUP);
806 static int com_term(__unused int socket_fd, int argc, __unused char **argv)
809 return -E_COMMAND_SYNTAX;
810 kill(getppid(), SIGTERM);
814 static int com_play(__unused int socket_fd, int argc, __unused char **argv)
817 return -E_COMMAND_SYNTAX;
819 mmd->new_afs_status_flags |= AFS_PLAYING;
820 mmd->new_afs_status_flags &= ~AFS_NOMORE;
827 static int com_stop(__unused int socket_fd, int argc, __unused char **argv)
830 return -E_COMMAND_SYNTAX;
832 mmd->new_afs_status_flags &= ~AFS_PLAYING;
833 mmd->new_afs_status_flags &= ~AFS_REPOS;
834 mmd->new_afs_status_flags |= AFS_NEXT;
840 static int com_pause(__unused int socket_fd, int argc, __unused char **argv)
843 return -E_COMMAND_SYNTAX;
847 mmd->new_afs_status_flags &= ~AFS_PLAYING;
848 mmd->new_afs_status_flags &= ~AFS_NEXT;
853 static int com_cdt(int fd, int argc, char **argv)
860 dbtool = para_strdup(dblist[mmd->dbt_num].name);
862 ret = send_va_buffer(fd, "%s\n", dbtool);
866 for (i = 0; dblist[i].name; i++) {
867 if (strcmp(dblist[i].name, argv[1]))
875 return -E_BAD_DBTOOL;
879 static int com_next(__unused int socket_fd, int argc, __unused char **argv)
882 return -E_COMMAND_SYNTAX;
884 mmd->new_afs_status_flags |= AFS_NEXT;
890 static int com_nomore(__unused int socket_fd, int argc, __unused char **argv)
893 return -E_COMMAND_SYNTAX;
895 if (afs_playing() || afs_paused())
896 mmd->new_afs_status_flags |= AFS_NOMORE;
902 static int com_ff(__unused int socket_fd, int argc, char **argv)
905 int ret, backwards = 0;
910 return -E_COMMAND_SYNTAX;
911 if (!(ret = sscanf(argv[1], "%u%c", &i, &c)))
912 return -E_COMMAND_SYNTAX;
913 if (ret > 1 && c == '-')
914 backwards = 1; /* jmp backwards */
916 ret = -E_NO_AUDIO_FILE;
917 if (!mmd->chunks_total || !mmd->seconds_total)
919 promille = (1000 * mmd->current_chunk) / mmd->chunks_total;
921 promille -= 1000 * i / mmd->seconds_total;
923 promille += 1000 * i / mmd->seconds_total;
926 if (promille > 1000) {
927 mmd->new_afs_status_flags |= AFS_NEXT;
930 mmd->repos_request = (mmd->chunks_total * promille) / 1000;
931 mmd->new_afs_status_flags |= AFS_REPOS;
932 mmd->new_afs_status_flags &= ~AFS_NEXT;
941 static int com_jmp(__unused int socket_fd, int argc, char **argv)
947 return -E_COMMAND_SYNTAX;
948 if (sscanf(argv[1], "%lu", &i) <= 0)
949 return -E_COMMAND_SYNTAX;
951 ret = -E_NO_AUDIO_FILE;
952 if (!mmd->chunks_total)
956 PARA_INFO_LOG("jumping to %lu%%\n", i);
957 mmd->repos_request = (mmd->chunks_total * i + 50)/ 100;
958 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
959 mmd->chunks_sent, mmd->offset);
960 mmd->new_afs_status_flags |= AFS_REPOS;
961 mmd->new_afs_status_flags &= ~AFS_NEXT;
970 * check if perms are sufficient to exec a command having perms cmd_perms.
971 * Returns 0 if perms are sufficient, -E_PERM otherwise.
973 static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
975 PARA_DEBUG_LOG("%s", "checking permissions\n");
976 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
980 * Parse first string from *cmd and lookup in table of valid commands.
981 * On error, NULL is returned.
983 static struct server_command *parse_cmd(const char *cmdstr)
988 sscanf(cmdstr, "%200s%n", buf, &n);
992 return get_cmd_ptr(buf, NULL);
995 long int para_rand(long unsigned max)
997 return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
1001 /* Open user_list file, returns pointer to opened file on success,
1004 static FILE *open_user_list(char *file)
1006 PARA_DEBUG_LOG("opening user list %s\n", file);
1007 return fopen(file, "r");
1011 * lookup user in user_list file. Fills in a user struct containing
1012 * filename of the user's public key as well as the permissions of that user.
1013 * Returns 1 on success, 0 if user does not exist and < 0 on errors.
1015 static int get_user(struct user *user) {
1019 /* keyword, user, key, perms */
1020 char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
1023 file_ptr = open_user_list(user_list);
1026 while (fgets(line, MAXLINE, file_ptr)) {
1027 // PARA_DEBUG_LOG("%s: Read line (%i bytes) "
1028 // "from config file\n", __func__, strlen(line));
1029 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
1031 if (!strcmp(w, "user") && !strcmp(user->name, n)) {
1032 PARA_DEBUG_LOG("found entry for %s\n", n);
1033 strcpy(user->name, n);
1034 strcpy(user->pubkey_file, k);
1037 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
1038 tmp[0], tmp[1], tmp[2], tmp[3]);
1039 PARA_DEBUG_LOG("found %i perm entries\n",
1044 //PARA_DEBUG_LOG("%s: tmp[%i]=%s\n", __func__,
1046 if (!strcmp(tmp[num], "AFS_READ"))
1048 user->perms | AFS_READ;
1049 else if (!strcmp(tmp[num], "AFS_WRITE"))
1051 user->perms | AFS_WRITE;
1052 else if (!strcmp(tmp[num], "DB_READ"))
1053 user->perms = user->perms | DB_READ;
1054 else if (!strcmp(tmp[num], "DB_WRITE"))
1055 user->perms = user->perms | DB_WRITE;
1056 else /* unknown permission */
1057 PARA_WARNING_LOG("unknown permission:"
1068 static void init_rc4_keys(void)
1072 for (i = 0; i < 2 * RC4_KEY_LEN; i++)
1073 rc4_buf[i] = para_rand(256);
1074 PARA_DEBUG_LOG("rc4 keys initialized (%u:%u)\n",
1075 (unsigned char) rc4_buf[0],
1076 (unsigned char) rc4_buf[RC4_KEY_LEN]);
1077 RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf);
1078 RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
1081 static void rc4_recv(unsigned long len, const unsigned char *indata, unsigned char *outdata)
1083 RC4(&rc4_recv_key, len, indata, outdata);
1085 static void rc4_send(unsigned long len, const unsigned char *indata, unsigned char *outdata)
1087 RC4(&rc4_send_key, len, indata, outdata);
1093 int handle_connect(int fd, struct sockaddr_in *addr)
1095 int numbytes, ret, argc, use_rc4 = 0;
1096 char buf[STRINGSIZE];
1097 unsigned char crypt_buf[MAXLINE];
1099 struct server_command *cmd = NULL;
1100 long unsigned challenge_nr, chall_response;
1102 char *p, *command = NULL;
1104 signal(SIGCHLD, SIG_IGN);
1105 signal(SIGINT, SIG_DFL);
1106 signal(SIGTERM, SIG_DFL);
1107 signal(SIGHUP, SIG_DFL);
1108 signal(SIGUSR1, SIG_IGN);
1111 challenge_nr = random();
1112 /* send Welcome message */
1113 ret = send_va_buffer(fd, "This is para_server, version " VERSION ".\n" );
1116 /* recv auth request line */
1117 ret = recv_buffer(fd, buf, sizeof(buf));
1126 if (strncmp(buf, "auth ", 5))
1129 if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9))
1130 strcpy(u.name, buf + 5); /* client version < 0.2.6 */
1132 strcpy(u.name, buf + 9); /* client version >= 0.2.6 */
1135 // strcpy(u.name, buf + 5); /* ok, but ugly */
1136 PARA_DEBUG_LOG("received %s request for user %s\n",
1137 use_rc4? "rc4" : "auth", u.name);
1138 /* lookup user in list file */
1139 if ((ret = get_user(&u)) < 0)
1141 if (!ret) { /* user not found */
1142 PARA_WARNING_LOG("auth request for unknown user %s\n", u.name);
1146 ret = para_encrypt_challenge(u.pubkey_file, challenge_nr, crypt_buf);
1150 PARA_DEBUG_LOG("sending %d byte challenge\n", numbytes);
1151 /* We can't use send_buffer here since buf may contain null bytes */
1152 ret = send_bin_buffer(fd,(char *) crypt_buf, numbytes);
1155 /* recv decrypted number */
1156 numbytes = recv_buffer(fd, buf, sizeof(buf));
1163 if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1
1164 || chall_response != challenge_nr)
1166 /* auth successful. Send 'Proceed' message */
1167 PARA_INFO_LOG("good auth for %s (%lu)\n", u.name, challenge_nr);
1168 sprintf(buf, "%s", PROCEED_MSG);
1171 ret = para_encrypt_buffer(u.pubkey_file, rc4_buf, 2 * RC4_KEY_LEN,
1172 (unsigned char *)buf + PROCEED_MSG_LEN + 1);
1175 numbytes = ret + strlen(PROCEED_MSG) + 1;
1177 numbytes = strlen(buf);
1178 ret = send_bin_buffer(fd, buf, numbytes);
1182 crypt_function_recv = rc4_recv;
1183 crypt_function_send = rc4_send;
1184 PARA_INFO_LOG("%s", "rc4 encrytion activated\n");
1187 while ((numbytes = recv_buffer(fd, buf, sizeof(buf))) > 0) {
1188 // PARA_INFO_LOG("recvd: %s (%d)\n", buf, numbytes);
1189 ret = -E_COMMAND_SYNTAX;
1190 if (command && numbytes + strlen(command) > STRINGSIZE) /* DOS */
1192 command = para_strcat(command, buf);
1193 if ((p = strstr(command, EOC_MSG))) {
1203 if (!(cmd = parse_cmd(command)))
1205 /* valid command, check permissions */
1206 ret = check_perms(u.perms, cmd);
1209 /* valid command and sufficient perms */
1211 argc = split_args(command, &argv, '\n');
1212 argv[0] = cmd->name;
1214 mmd->num_commands++;
1216 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u.name,
1217 inet_ntoa(addr->sin_addr));
1218 ret = cmd->handler(fd, argc, argv);
1224 if (ret != -E_SEND && ret != -E_RECV) {
1225 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
1226 send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret));
1233 if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
1235 mmd->active_connections--;