-/*
- * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- */
-
-/** \file command.c does client authentication and executes server commands */
-
-#include <sys/time.h> /* gettimeofday */
-#include "server.cmdline.h"
-#include "db.h"
-#include "server.h"
+/* Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
+
+/** \file command.c Client authentication and server commands. */
+
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <regex.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <osl.h>
+#include <arpa/inet.h>
+#include <sys/un.h>
+#include <netdb.h>
+#include <lopsub.h>
+
+#include "server.lsg.h"
+#include "para.h"
+#include "error.h"
+#include "crypt.h"
+#include "sideband.h"
+#include "command.h"
+#include "string.h"
+#include "afh.h"
#include "afs.h"
+#include "server.h"
+#include "list.h"
#include "send.h"
-#include "rc4.h"
-#include <openssl/rc4.h>
-#include "error.h"
+#include "sched.h"
+#include "vss.h"
#include "net.h"
#include "daemon.h"
-#include "string.h"
#include "fd.h"
+#include "ipc.h"
+#include "server_cmd.lsg.h"
#include "user_list.h"
+#include "signal.h"
+#include "version.h"
-static RC4_KEY rc4_recv_key;
-static RC4_KEY rc4_send_key;
-static unsigned char rc4_buf[2 * RC4_KEY_LEN];
-
-extern const char *status_item_list[NUM_STAT_ITEMS];
-extern struct misc_meta_data *mmd;
-extern struct audio_file_selector selectors[];
-extern struct sender senders[];
-extern char *user_list;
-struct sockaddr_in *in_addr;
-
-static int com_si(int, int, char **);
-static int com_version(int, int, char **);
-static int com_sb(int, int, char **);
-static int com_sc(int, int, char **);
-static int com_stat(int, int, char **);
-static int com_help(int, int, char **);
-static int com_hup(int, int, char **);
-static int com_term(int, int, char **);
-static int com_play(int, int, char **);
-static int com_stop(int, int, char **);
-static int com_pause(int, int, char **);
-static int com_next(int, int, char **);
-static int com_nomore(int, int, char **);
-static int com_chs(int, int, char **);
-static int com_ff(int, int, char **);
-static int com_jmp(int, int, char **);
-static int com_sender(int, int, char **);
-
-
-/* commands that are handled by the server itself */
-static struct server_command cmd_struct[] = {
-{
-.name = "chs",
-.handler = com_chs,
-.perms = DB_READ | DB_WRITE,
-.description = "change the current audio file selector",
-.synopsis = "chs [new_selector]",
-.help =
-"Shutdown the current selector and activate new_selector. If no\n"
-"argument was given, print the name of the current selector.\n"
-},
-
-{
-.name = "ff",
-.handler = com_ff,
-.perms = AFS_READ | AFS_WRITE,
-.description = "jmp amount of time forwards or backwards "
- "in current audio file",
-.synopsis = "ff n[-]",
-.help =
-
-"\tSet the 'R' (reposition request) bit of the afs status flags\n"
-"\tand enqueue a request to jump n seconds forwards or backwards\n"
-"\tin the current audio file.\n"
-"\n"
-"EXAMPLE\n"
-"\n"
-"\t\tff 30-\n"
-"\n"
-"\tjumps 30 seconds backwards.\n"
-
-},
-
-{
-.name = "help",
-.handler = com_help,
-.perms = 0,
-.description = "print help text",
-.synopsis = "help [command]",
-.help =
-
-"Without any arguments, help prints a list of availible commands. When\n"
-"issued with a command name as first argument, print out a description\n"
-"for that command.\n"
-
-},
-
-{
-.name = "hup",
-.handler = com_hup,
-.perms = AFS_WRITE,
-.description = "force reload of config file and log file",
-.synopsis = "hup",
-.help =
-
-"After rereading the config file, a signal is sent to all children\n"
-"which forces them to close/reopen the log file.\n"
-
-},
-
-{
-.name = "jmp",
-.handler = com_jmp,
-.perms = AFS_READ | AFS_WRITE,
-.description = "jmp to given position in current audio file",
-.synopsis = "jmp [n]",
-.help =
-
-"\tSet the 'R' (reposition request) bit of the afs status flags\n"
-"\tand enqueue a request to jump to n% of the current audio file,\n"
-"\twhere 0 <= n <= 100.\n"
-
-},
-
-{
-.name = "next",
-.handler = com_next,
-.perms = AFS_READ | AFS_WRITE,
-.description = "skip rest of current audio file",
-.synopsis = "next",
-.help =
-
-"\tSet the 'N' (next audio file) bit of the afs status flags. When\n"
-"\tplaying, change audio file immediately. Equivalent to stop\n"
-"\tif paused, NOP if stopped.\n"
-
-
-},
-
-{
-.name = "nomore",
-.handler = com_nomore,
-.perms = AFS_READ | AFS_WRITE,
-.description = "stop playing after current audio file",
-.synopsis = "nomore",
-.help =
-
-"Set the 'O' (no more) bit of the afs status flags. This instructs\n"
-"para_server to clear the 'P' (playing) bit as soon as it encounters\n"
-"the 'N' (next audio file) bit being set.\n"
-"\n"
-"Use this command instead of stop if you don't like\n"
-"sudden endings.\n"
-
-},
-
-{
-.name ="pause",
-.handler = com_pause,
-.perms = AFS_READ | AFS_WRITE,
-.description = "pause current audio file",
-.synopsis = "pause",
-.help =
-
-"\tClear the 'P' (playing) bit of the afs status flags.\n"
-
-},
-
-{
-.name = "play",
-.handler = com_play,
-.perms = AFS_READ | AFS_WRITE,
-.description = "start playing or resume playing when paused",
-.synopsis = "play",
-.help =
-
-"\tSet the 'P' (playing) bit of the afs status flags. This\n"
-"\tresults in starting/continuing to stream.\n"
-
-},
-
-{
-.name = "sb",
-.handler = com_sb,
-.perms = AFS_READ,
-.description = "print status bar for current audio file",
-.synopsis = "sb [n]",
-.help =
-
-"Without any arguments, sb continuously prints a status bar of the form\n"
-"\n"
-" 12:34 [56:12] (56%) filename\n"
-"\n"
-"indicating playing time, remaining time, percentage and the name of\n"
-"the file beeing streamed. Use the optional number n to let stat exit\n"
-"after having displayed the status bar n times.\n"
-
-},
-{
-.name = "sc",
-.handler = com_sc,
-.perms = AFS_READ,
-.description = "print name of audio file whenever it changes",
-.synopsis = "sc [n]",
-.help =
-
-"\tsc prints exactly one line (the filename of the audio file\n"
-"\tbeing played) whenever the audio file changes. Stops after\n"
-"\tn iterations, or never if n is not specified.\n"
-
-},
-{
-.name = "sender",
-.handler = com_sender,
-.perms = AFS_READ | AFS_WRITE,
-.description = "control paraslash internal senders",
-.synopsis = "sender [s cmd [arguments]]",
-.help =
-
-"send command cmd to sender s. cmd may be one of the following:\n"
-"help, on, off, add, delete, allow, or deny. Note that not all senders\n"
-"support each command. Try e.g. 'para_client sender http help' for\n"
-"more information about the http sender. If no argument is given,\n"
-"print out a list of all senders that are compiled in.\n"
-
-},
-{
-.name = "si",
-.handler = com_si,
-.perms = 0,
-.description = "print server info",
-.synopsis = "si",
-.help =
-"Print server uptime and other information.\n"
-},
-
-{
-.name = "stat",
-.handler = com_stat,
-.perms = AFS_READ,
-.description = "print status info for current audio file",
-.synopsis = "stat [n]",
-.help =
-
-"\tWithout any arguments, stat continuously prints status messages\n"
-"\tof the audio file being streamed. Use the optional number n\n"
-"\tto let stat exit after having displayed status n times.\n"
-
-},
-
-{
-.name = "stop",
-.handler = com_stop,
-.perms = AFS_READ | AFS_WRITE,
-.description = "stop playing",
-.synopsis = "stop",
-.help =
+#define SERVER_CMD_AUX_INFO(_arg) _arg,
+static const unsigned server_command_perms[] = {LSG_SERVER_CMD_AUX_INFOS};
+#undef SERVER_CMD_AUX_INFO
+#define SERVER_CMD_AUX_INFO(_arg) #_arg,
+static const char * const server_command_perms_txt[] = {LSG_SERVER_CMD_AUX_INFOS};
+#undef SERVER_CMD_AUX_INFO
-"\tClear the 'P' (play) bit and set the 'N' bit of the afs status\n"
-"\tflags.\n"
+/** Commands including options must be shorter than this. */
+#define MAX_COMMAND_LEN 32768
-},
-{
-.name = "term",
-.handler = com_term,
-.perms = AFS_READ | AFS_WRITE,
-.description = "terminate para_server",
-.synopsis = "term",
-.help =
-
-"Shuts down the server. Instead of this command, you can also send\n"
-"SIGINT or SIGTERM. It should never be necessary to send SIGKILL.\n"
-
-},
-{
-.name = "version",
-.handler = com_version,
-.perms = 0,
-.description = "print server's version",
-.synopsis = "version",
-.help =
-"Show version and other info\n"
-},
-/* this indicates the end of the list. Do not touch. */
-{
-.name = NULL,
-}
-};
+extern int mmd_mutex;
+extern struct misc_meta_data *mmd;
+int send_afs_status(struct command_context *cc, int parser_friendly);
static void dummy(__a_unused int s)
-{}
-
-static void mmd_dup(struct misc_meta_data *new_mmd)
{
- mmd_lock();
- *new_mmd = *mmd;
- mmd_unlock();
}
/*
- * compute human readable string containing
- * afs_status for given integer value
+ * Compute human readable vss status text.
+ *
+ * We can't call vss_playing() and friends here because those functions read
+ * the flags from the primary mmd structure, so calling them from command
+ * handler context would require to take the mmd lock. At the time the function
+ * is called we already took a copy of the mmd structure and want to use the
+ * flags value of the copy for computing the vss status text.
*/
-static char *afs_status_tohuman(unsigned int flags)
+static char *vss_status_tohuman(unsigned int flags)
{
- if (flags & AFS_PLAYING)
+ if (flags & VSS_PLAYING)
return para_strdup("playing");
- else if (flags & AFS_NEXT)
+ if (flags & VSS_NEXT)
return para_strdup("stopped");
- else
- return para_strdup("paused");
+ return para_strdup("paused");
}
/*
- * return human readable permission string. Never returns NULL.
+ * Never returns NULL.
*/
-char *cmd_perms_itohuman(unsigned int perms)
+static char *vss_get_status_flags(unsigned int flags)
{
- char *msg = para_malloc(7 * sizeof(char));
+ char *msg = para_malloc(5 * sizeof(char));
- msg[0] = perms & DB_READ? 'd' : '-';
- msg[1] = perms & DB_WRITE? 'D' : '-';
- msg[2] = perms & AFS_READ? 'a' : '-';
- msg[3] = perms & AFS_WRITE? 'A' : '-';
+ msg[0] = (flags & VSS_PLAYING)? 'P' : '_';
+ msg[1] = (flags & VSS_NOMORE)? 'O' : '_';
+ msg[2] = (flags & VSS_NEXT)? 'N' : '_';
+ msg[3] = (flags & VSS_REPOS)? 'R' : '_';
msg[4] = '\0';
return msg;
}
-/*
- * Never returns NULL.
- */
-static char *afs_get_status_flags(unsigned int flags)
+static unsigned get_status(struct misc_meta_data *nmmd, bool parser_friendly,
+ char **result)
{
- char *msg = para_malloc(5 * sizeof(char));
+ char *status, *flags; /* vss status info */
+ /* nobody updates our version of "now" */
+ long offset = (nmmd->offset + 500) / 1000;
+ struct timeval current_time;
+ struct para_buffer b = {.flags = parser_friendly? PBF_SIZE_PREFIX : 0};
- msg[0] = (flags & AFS_PLAYING)? 'P' : '_';
- msg[1] = (flags & AFS_NOMORE)? 'O' : '_';
- msg[2] = (flags & AFS_NEXT)? 'N' : '_';
- msg[3] = (flags & AFS_REPOS)? 'R' : '_';
- msg[4] = '\0';
- return msg;
+ /* report real status */
+ status = vss_status_tohuman(nmmd->vss_status_flags);
+ flags = vss_get_status_flags(nmmd->vss_status_flags);
+ clock_get_realtime(¤t_time);
+ /*
+ * The calls to WRITE_STATUS_ITEM() below never fail because
+ * b->max_size is zero (unlimited), see \ref para_printf(). However,
+ * clang is not smart enough to prove this and complains nevertheless.
+ * Casting the return value to void silences clang.
+ */
+ (void)WRITE_STATUS_ITEM(&b, SI_status, "%s\n", status);
+ (void)WRITE_STATUS_ITEM(&b, SI_status_flags, "%s\n", flags);
+ (void)WRITE_STATUS_ITEM(&b, SI_offset, "%li\n", offset);
+ (void)WRITE_STATUS_ITEM(&b, SI_afs_mode, "%s\n", mmd->afs_mode_string);
+ (void)WRITE_STATUS_ITEM(&b, SI_stream_start, "%lu.%lu\n",
+ (long unsigned)nmmd->stream_start.tv_sec,
+ (long unsigned)nmmd->stream_start.tv_usec);
+ (void)WRITE_STATUS_ITEM(&b, SI_current_time, "%lu.%lu\n",
+ (long unsigned)current_time.tv_sec,
+ (long unsigned)current_time.tv_usec);
+ free(flags);
+ free(status);
+ *result = b.buf;
+ return b.offset;
}
-/*
- * compute status bar string. Never returns NULL
+/**
+ * Send a sideband packet through a blocking file descriptor.
+ *
+ * \param scc fd and crypto keys.
+ * \param buf The buffer to send.
+ * \param numbytes The size of \a buf.
+ * \param band The sideband designator of this packet.
+ * \param dont_free If true, never deallocate \a buf.
+ *
+ * The nonblock flag must be disabled for the file descriptor given by \a scc.
+ *
+ * Stream cipher encryption is automatically activated if necessary via the
+ * sideband transformation, depending on the value of \a band.
+ *
+ * \return Standard.
+ *
+ * \sa \ref send_sb_va().
*/
-char *get_sb_string(struct misc_meta_data *nmmd)
+int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
+ int band, bool dont_free)
{
- char *base, *ret;
- long long unsigned secs = 0, rsecs = 0, percent = 0;
-
- base = para_basename(nmmd->filename);
- if (!base)
- return para_strdup("");
- if (!base[0])
- return base;
- if (nmmd->chunks_total) {
- secs = (long long) nmmd->seconds_total * nmmd->chunks_sent
- / nmmd->chunks_total;
- rsecs = (long long) nmmd->seconds_total *
- (nmmd->chunks_total - nmmd->chunks_sent)
- / nmmd->chunks_total;
- percent = 100 * ((nmmd->chunks_sent + 5) / 10)
- / ((nmmd->chunks_total + 5) / 10);
- }
- ret = make_message("%llu:%02llu [%llu:%02llu] (%llu%%) %s",
- secs / 60, secs % 60,
- rsecs / 60, rsecs % 60,
- percent,
- base
- );
- free(base);
+ int ret;
+ struct sb_context *sbc;
+ struct iovec iov[2];
+ sb_transformation trafo = band < SBD_PROCEED? NULL : sc_trafo;
+ struct sb_buffer sbb = SBB_INIT(band, buf, numbytes);
+
+ sbc = sb_new_send(&sbb, dont_free, trafo, scc->send);
+ do {
+ ret = sb_get_send_buffers(sbc, iov);
+ ret = xwritev(scc->fd, iov, ret);
+ if (ret < 0)
+ goto fail;
+ } while (sb_sent(sbc, ret) == false);
+ return 1;
+fail:
+ sb_free(sbc);
return ret;
}
-static char *get_status(struct misc_meta_data *nmmd)
+/**
+ * Create a variable sized buffer and send it as a sideband packet.
+ *
+ * \param scc Passed to \ref send_sb.
+ * \param band See \ref send_sb.
+ * \param fmt The format string.
+ *
+ * \return The return value of the underlying call to \ref send_sb.
+ */
+__printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
+ const char *fmt, ...)
{
- char *bar, *ret, mtime[30] = "";
- char *status, *flags; /* afs status info */
- char *ut = uptime_str();
- long offset = (nmmd->offset + 500) / 1000;
- struct timeval now;
- struct tm mtime_tm;
+ va_list ap;
+ char *msg;
+ int ret;
- if (nmmd->audio_format >= 0) {
- localtime_r(&nmmd->mtime, &mtime_tm);
- strftime(mtime, 29, "%a %b %d %Y", &mtime_tm);
- }
- /* report real status */
- status = afs_status_tohuman(nmmd->afs_status_flags);
- flags = afs_get_status_flags(nmmd->afs_status_flags);
- bar = para_basename(nmmd->filename);
- gettimeofday(&now, NULL);
- ret = make_message(
- "%s:%lu\n" "%s:%s\n" "%s:%i\n" "%s:%u\n"
- "%s:%s\n" "%s:%s\n" "%s:%s\n" "%s:%s\n"
- "%s:%li\n" "%s:%s\n" "%s" "%s"
- "%s:%s\n" "%s:%lu.%lu\n" "%s:%lu.%lu\n",
- status_item_list[SI_FILE_SIZE], nmmd->size / 1024,
- status_item_list[SI_MTIME], mtime,
- status_item_list[SI_LENGTH], nmmd->seconds_total,
- status_item_list[SI_NUM_PLAYED], nmmd->num_played,
-
- status_item_list[SI_STATUS_BAR], bar ? bar : "(none)",
- status_item_list[SI_STATUS], status,
- status_item_list[SI_STATUS_FLAGS], flags,
- status_item_list[SI_SELECTOR], selectors[nmmd->selector_num].name,
-
- status_item_list[SI_OFFSET], offset,
- status_item_list[SI_FORMAT], audio_format_name(nmmd->audio_format),
- nmmd->selector_info,
- nmmd->audio_file_info,
-
- status_item_list[SI_UPTIME], ut,
- status_item_list[SI_STREAM_START],
- (long unsigned)nmmd->stream_start.tv_sec,
- (long unsigned)nmmd->stream_start.tv_usec,
- status_item_list[SI_CURRENT_TIME],
- (long unsigned)now.tv_sec,
- (long unsigned)now.tv_usec
+ va_start(ap, fmt);
+ ret = xvasprintf(&msg, fmt, ap);
+ va_end(ap);
+ return send_sb(scc, msg, ret, band, false);
+}
- );
- free(bar);
- free(flags);
- free(status);
- free(ut);
+/**
+ * Send an error message to a client.
+ *
+ * \param cc Client info.
+ * \param err The (positive) error code.
+ *
+ * \return The return value of the underlying call to send_sb_va().
+ */
+int send_strerror(struct command_context *cc, int err)
+{
+ return send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", para_strerror(err));
+}
+
+/**
+ * Send an error context to a client,
+ *
+ * \param cc Client info.
+ * \param errctx The error context string.
+ *
+ * \return The return value of the underlying call to send_sb_va().
+ *
+ * This function frees the error context string after it was sent.
+ */
+int send_errctx(struct command_context *cc, char *errctx)
+{
+ int ret;
+
+ if (!errctx)
+ return 0;
+ ret = send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", errctx);
+ free(errctx);
return ret;
}
-static int check_sender_args(int argc, char **argv, struct sender_command_data *scd)
+static int check_sender_args(struct command_context *cc,
+ struct lls_parse_result *lpr, struct sender_command_data *scd)
{
- int i;
- /* this has to match sender.h */
- const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
+ int i, ret;
+ const char * const subcmds[] = {SENDER_SUBCOMMANDS};
+ const char *arg;
+ char *errctx;
+ unsigned num_inputs = lls_num_inputs(lpr);
scd->sender_num = -1;
- if (argc < 2)
- return -E_COMMAND_SYNTAX;
- for (i = 0; senders[i].name; i++)
- if (!strcmp(senders[i].name, argv[1]))
+ ret = lls(lls_check_arg_count(lpr, 2, INT_MAX, &errctx));
+ if (ret < 0) {
+ send_errctx(cc, errctx);
+ return ret;
+ }
+ arg = lls_input(0, lpr);
+ FOR_EACH_SENDER(i)
+ if (strcmp(senders[i]->name, arg) == 0)
break;
- PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
- if (!senders[i].name)
+ if (!senders[i])
return -E_COMMAND_SYNTAX;
scd->sender_num = i;
- for (i = 0; subcmds[i]; i++)
- if (!strcmp(subcmds[i], argv[2]))
+ arg = lls_input(1, lpr);
+ for (i = 0; i < NUM_SENDER_CMDS; i++)
+ if (!strcmp(subcmds[i], arg))
break;
- if (!subcmds[i])
+ if (i == NUM_SENDER_CMDS)
return -E_COMMAND_SYNTAX;
scd->cmd_num = i;
- mmd_lock();
- if (!senders[scd->sender_num].client_cmds[scd->cmd_num]) {
- mmd_unlock();
+ if (!senders[scd->sender_num]->client_cmds[scd->cmd_num])
return -E_SENDER_CMD;
- }
- mmd_unlock();
switch (scd->cmd_num) {
- case SENDER_ON:
- case SENDER_OFF:
- if (argc != 3)
+ case SENDER_on:
+ case SENDER_off:
+ if (num_inputs != 2)
return -E_COMMAND_SYNTAX;
break;
- case SENDER_DENY:
- case SENDER_ALLOW:
- if (argc != 4 && argc != 5)
- return -E_COMMAND_SYNTAX;
- if (!inet_aton(argv[3], &scd->addr))
+ case SENDER_deny:
+ case SENDER_allow:
+ if (num_inputs != 3 || parse_cidr(lls_input(2, lpr), scd->host,
+ sizeof(scd->host), &scd->netmask) == NULL)
return -E_COMMAND_SYNTAX;
- scd->netmask = 32;
- if (argc == 5) {
- scd->netmask = atoi(argv[4]);
- if (scd->netmask < 0 || scd->netmask > 32)
- return -E_COMMAND_SYNTAX;
- }
break;
- case SENDER_ADD:
- case SENDER_DELETE:
- if (argc != 4 && argc != 5)
+ case SENDER_add:
+ case SENDER_delete:
+ if (num_inputs != 3)
return -E_COMMAND_SYNTAX;
- if (!inet_aton(argv[3], &scd->addr))
- return -E_COMMAND_SYNTAX;
- scd->port = -1;
- if (argc == 5) {
- scd->port = atoi(argv[4]);
- if (scd->port < 0 || scd->port > 65535)
- return -E_COMMAND_SYNTAX;
- }
- break;
+ return parse_fec_url(lls_input(2, lpr), scd);
default:
return -E_COMMAND_SYNTAX;
}
return 1;
}
-static int com_sender(int fd, int argc, char **argv)
+/**
+ * Send a sideband packet through a blocking file descriptor.
+ *
+ * \param scc fd and crypto keys.
+ * \param expected_band The expected band designator.
+ * \param max_size Passed to \ref sb_new_recv().
+ * \param result Body of the sideband packet is returned here.
+ *
+ * If \a expected_band is not \p SBD_ANY, the band designator of the received
+ * sideband packet is compared to \a expected_band and a mismatch is considered
+ * an error.
+ *
+ * \return Standard.
+ */
+int recv_sb(struct stream_cipher_context *scc,
+ enum sb_designator expected_band,
+ size_t max_size, struct iovec *result)
{
- int i, ret;
+ int ret;
+ struct sb_context *sbc;
+ struct iovec iov;
+ struct sb_buffer sbb;
+ sb_transformation trafo;
+
+ trafo = expected_band != SBD_ANY && expected_band < SBD_PROCEED?
+ NULL : sc_trafo;
+ sbc = sb_new_recv(max_size, trafo, scc->recv);
+ for (;;) {
+ sb_get_recv_buffer(sbc, &iov);
+ ret = recv_bin_buffer(scc->fd, iov.iov_base, iov.iov_len);
+ if (ret == 0)
+ ret = -E_EOF;
+ if (ret < 0)
+ goto fail;
+ ret = sb_received(sbc, ret, &sbb);
+ if (ret < 0)
+ goto fail;
+ if (ret > 0)
+ break;
+ }
+ ret = -E_BAD_BAND;
+ if (expected_band != SBD_ANY && sbb.band != expected_band)
+ goto fail;
+ *result = sbb.iov;
+ return 1;
+fail:
+ sb_free(sbc);
+ return ret;
+}
+
+static int com_sender(struct command_context *cc, struct lls_parse_result *lpr)
+{
+ int i, ret = 0;
+ char *msg = NULL;
struct sender_command_data scd;
- if (argc < 2) {
- char *msg = NULL;
- for (i = 0; senders[i].name; i++) {
- char *tmp = make_message("%s%s\n",
- msg? msg : "", senders[i].name);
+ if (lls_num_inputs(lpr) == 0) {
+ FOR_EACH_SENDER(i) {
+ char *tmp;
+ ret = xasprintf(&tmp, "%s%s\n", msg? msg : "",
+ senders[i]->name);
free(msg);
msg = tmp;
}
- ret = send_buffer(fd, msg);
- free(msg);
- return ret;
+ return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
}
- ret = check_sender_args(argc, argv, &scd);
+ ret = check_sender_args(cc, lpr, &scd);
if (ret < 0) {
- char *msg;
if (scd.sender_num < 0)
return ret;
- msg = senders[scd.sender_num].help();
- send_buffer(fd, msg);
- free(msg);
- return 1;
+ if (strcmp(lls_input(1, lpr), "status") == 0)
+ msg = senders[scd.sender_num]->status();
+ else
+ msg = senders[scd.sender_num]->help();
+ return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
+ }
+
+ switch (scd.cmd_num) {
+ case SENDER_add:
+ case SENDER_delete:
+ assert(senders[scd.sender_num]->resolve_target);
+ ret = senders[scd.sender_num]->resolve_target(lls_input(2, lpr),
+ &scd);
+ if (ret < 0)
+ return ret;
}
+
for (i = 0; i < 10; i++) {
- mmd_lock();
+ mutex_lock(mmd_mutex);
if (mmd->sender_cmd_data.cmd_num >= 0) {
- mmd_unlock();
- usleep(100 * 1000);
+ /* another sender command is active, retry in 100ms */
+ struct timespec ts = {.tv_nsec = 100 * 1000 * 1000};
+ mutex_unlock(mmd_mutex);
+ nanosleep(&ts, NULL);
continue;
}
mmd->sender_cmd_data = scd;
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
break;
}
return (i < 10)? 1 : -E_LOCK;
}
+EXPORT_SERVER_CMD_HANDLER(sender);
-/* server info */
-static int com_si(int fd, int argc, __a_unused char **argv)
+static int com_si(struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- int i, ret;
- char *ut;
- char *selector_string = NULL, *sender_info = NULL, *sender_list = NULL;
+ char *msg, *ut;
+ int ret;
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
- mmd_lock();
- for (i = 0; selectors[i].name; i++) {
- selector_string = para_strcat(selector_string, selectors[i].name);
- selector_string = para_strcat(selector_string, " ");
- }
- for (i = 0; senders[i].name; i++) {
- char *info = senders[i].info();
- sender_info = para_strcat(sender_info, info);
- free(info);
- sender_list = para_strcat(sender_list, senders[i].name);
- sender_list = para_strcat(sender_list, " ");
- }
- ut = uptime_str();
- ret = send_va_buffer(fd, "up: %s\nplayed: %u\n"
- "pid: %d\n"
+ ut = daemon_get_uptime_str(now);
+ mutex_lock(mmd_mutex);
+ ret = xasprintf(&msg,
+ "up: %s\nplayed: %u\n"
+ "server_pid: %d\n"
+ "afs_pid: %d\n"
"connections (active/accepted/total): %u/%u/%u\n"
- "current loglevel: %i\n"
- "supported audio file selectors: %s\n"
- "supported audio formats: %s\n"
- "supported senders: %s\n"
- "%s",
+ "current loglevel: %s\n"
+ "supported audio formats: %s\n",
ut, mmd->num_played,
- getppid(),
+ (int)getppid(),
+ (int)afs_pid,
mmd->active_connections,
mmd->num_commands,
mmd->num_connects,
- conf.loglevel_arg,
- selector_string,
- supported_audio_formats(),
- sender_list,
- sender_info
+ ENUM_STRING_VAL(LOGLEVEL),
+ AUDIO_FORMAT_HANDLERS
);
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
free(ut);
- free(selector_string);
- free(sender_list);
- free(sender_info);
- return ret;
+ return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
}
+EXPORT_SERVER_CMD_HANDLER(si);
-/* version */
-static int com_version(int socket_fd, int argc, __a_unused char **argv)
+static int com_version(struct command_context *cc, struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
- return send_buffer(socket_fd, "para_server-" PACKAGE_VERSION ", \""
- CODENAME "\"\n"
- COPYRIGHT "\n"
- "built: " BUILD_DATE "\n"
- SYSTEM ", " CC_VERSION "\n"
- );
-}
+ char *msg;
+ size_t len;
-/* sc */
-static int com_sc(int socket_fd, int argc, char **argv)
-{
- char *name = NULL;
- int ret, old = 0, count = -1; /* print af change forever */
-
- if (argc > 1)
- count = atoi(argv[1]);
-repeat:
- mmd_lock();
- if (old != mmd->num_played) {
- old = mmd->num_played;
- name = para_strdup(mmd->filename);
- }
- mmd_unlock();
- if (name) {
- ret = send_va_buffer(socket_fd, "%s\n", name);
- free(name);
- name = NULL;
- if (ret < 0)
- return ret;
- if (argc > 1 && !--count)
- return 1;
- }
- usleep(500000);
- goto repeat;
-}
+ if (SERVER_CMD_OPT_GIVEN(VERSION, VERBOSE, lpr))
+ len = xasprintf(&msg, "%s", version_text("server"));
+ else
+ len = xasprintf(&msg, "%s\n", version_single_line("server"));
+ return send_sb(&cc->scc, msg, len, SBD_OUTPUT, false);
+}
+EXPORT_SERVER_CMD_HANDLER(version);
+
+/** These status items are cleared if no audio file is currently open. */
+#define EMPTY_STATUS_ITEMS \
+ ITEM(path) \
+ ITEM(directory) \
+ ITEM(basename) \
+ ITEM(score) \
+ ITEM(attributes_bitmap) \
+ ITEM(attributes_txt) \
+ ITEM(hash) \
+ ITEM(image_id) \
+ ITEM(image_name) \
+ ITEM(lyrics_id) \
+ ITEM(lyrics_name) \
+ ITEM(bitrate) \
+ ITEM(format) \
+ ITEM(frequency) \
+ ITEM(channels) \
+ ITEM(duration) \
+ ITEM(seconds_total) \
+ ITEM(num_played) \
+ ITEM(last_played) \
+ ITEM(techinfo) \
+ ITEM(artist) \
+ ITEM(title) \
+ ITEM(year) \
+ ITEM(album) \
+ ITEM(comment) \
+ ITEM(mtime) \
+ ITEM(file_size) \
+ ITEM(chunk_time) \
+ ITEM(num_chunks) \
+ ITEM(amplification) \
-/* sb */
-static int com_sb(int socket_fd, int argc, char **argv)
-{
- char *sb;
- int ret, nr = -1; /* status bar will be printed that many
- * times. Negative value means: print
- * forever
- */
- if (argc > 1)
- nr = atoi(argv[1]);
- while (nr) {
- mmd_lock();
- sb = get_sb_string(mmd);
- mmd_unlock();
- ret = send_va_buffer(socket_fd, "%s\n", sb);
- free(sb);
- if (ret < 0)
- return ret;
- if (nr == 1)
- return 1;
- usleep(500000);
- if (nr > 0)
- nr--;
- }
- return 1;
+/*
+ * Create a set of audio-file related status items with empty values. These are
+ * written to stat clients when no audio file is open.
+ */
+static unsigned empty_status_items(bool parser_friendly, char **result)
+{
+ char *esi;
+ unsigned len;
+
+ if (parser_friendly)
+ len = xasprintf(&esi,
+ #define ITEM(x) "0004 %02x:\n"
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ #define ITEM(x) , (unsigned) SI_ ## x
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ );
+ else
+ len = xasprintf(&esi,
+ #define ITEM(x) "%s:\n"
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ #define ITEM(x) ,status_item_list[SI_ ## x]
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ );
+ *result = esi;
+ return len;
}
+#undef EMPTY_STATUS_ITEMS
-/* stat */
-static int com_stat(int socket_fd, int argc, char **argv)
+static int com_stat(struct command_context *cc, struct lls_parse_result *lpr)
{
- int ret, num = 0;/* status will be printed that many
- * times. num <= 0 means: print forever
- */
+ int ret;
struct misc_meta_data tmp, *nmmd = &tmp;
char *s;
+ bool parser_friendly = SERVER_CMD_OPT_GIVEN(STAT, PARSER_FRIENDLY,
+ lpr) > 0;
+ uint32_t num = SERVER_CMD_UINT32_VAL(STAT, NUM, lpr);
- signal(SIGUSR1, dummy);
-
- if (argc > 1)
- num = atoi(argv[1]);
+ para_sigaction(SIGUSR1, dummy);
for (;;) {
-
- mmd_dup(nmmd);
- s = get_status(nmmd);
- ret = send_buffer(socket_fd, s);
- free(s);
+ /*
+ * Copy the mmd structure to minimize the time we hold the mmd
+ * lock.
+ */
+ mutex_lock(mmd_mutex);
+ *nmmd = *mmd;
+ mutex_unlock(mmd_mutex);
+ ret = get_status(nmmd, parser_friendly, &s);
+ ret = send_sb(&cc->scc, s, ret, SBD_OUTPUT, false);
if (ret < 0)
goto out;
+ if (nmmd->vss_status_flags & VSS_NEXT) {
+ char *esi;
+ ret = empty_status_items(parser_friendly, &esi);
+ ret = send_sb(&cc->scc, esi, ret, SBD_OUTPUT, false);
+ if (ret < 0)
+ goto out;
+ } else
+ send_afs_status(cc, parser_friendly);
ret = 1;
- if (num == 1)
+ if (num > 0 && !--num)
goto out;
sleep(50);
+ ret = -E_SERVER_CRASH;
if (getppid() == 1)
- return -E_SERVER_CRASH;
+ goto out;
}
out:
return ret;
}
+EXPORT_SERVER_CMD_HANDLER(stat);
-static int send_description(int fd, struct server_command *cmd, const char *handler, int num)
+/* fixed-length, human readable permission string */
+const char *server_cmd_perms_str(unsigned int perms)
{
- int ret, i;
-
- for (i = 1; cmd->name && (!num || i <= num); cmd++, i++) {
- char *perms = cmd_perms_itohuman(cmd->perms);
- ret = send_va_buffer(fd, "%s\t%s\t%s\t%s\n", cmd->name,
- handler,
- perms,
- cmd->description);
- free(perms);
- if (ret < 0)
- return ret;
- }
- return 1;
+ static char result[5];
+
+ result[0] = perms & AFS_READ? 'a' : '-';
+ result[1] = perms & AFS_WRITE? 'A' : '-';
+ result[2] = perms & VSS_READ? 'v' : '-';
+ result[3] = perms & VSS_WRITE? 'V' : '-';
+ result[4] = '\0';
+ return result;
}
-/* always returns string that must be freed by the caller in handler */
-static struct server_command *get_cmd_ptr(char *name, char **handler)
+static int send_list_of_commands(struct command_context *cc)
{
- struct server_command *cmd = cmd_struct;
+ int i;
+ const struct lls_command *cmd;
+ char *msg = para_strdup("");
- for (cmd = cmd_struct; cmd->name; cmd++)
- if (!strcmp(cmd->name, name)) {
- if (handler)
- *handler = para_strdup("para_server"); /* server commands */
- return cmd;
- }
- /* not found, look for commands supported by the current selector */
- mmd_lock();
- if (handler)
- *handler = make_message("the %s selector",
- selectors[mmd->selector_num].name);
- cmd = selectors[mmd->selector_num].cmd_list;
- mmd_unlock();
- for (; cmd->name; cmd++)
- if (!strcmp(cmd->name, name))
- return cmd;
- return NULL;
+ for (i = 1; (cmd = lls_cmd(i, server_cmd_suite)); i++) {
+ const char *perms = server_cmd_perms_str(server_command_perms[i]);
+ char *tmp = make_message("%s%s\t%s\t%s\n", msg,
+ lls_command_name(cmd), perms, lls_purpose(cmd));
+ free(msg);
+ msg = tmp;
+ }
+ return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
}
-/* help */
-static int com_help(int fd, int argc, char **argv)
+static int com_help(struct command_context *cc, struct lls_parse_result *lpr)
{
- struct server_command *cmd;
- char *perms, *handler;
+ const char *perms;
+ char *long_help, *buf, *errctx;
int ret;
+ const struct lls_command *cmd;
- if (argc < 2) {
- /* no argument given, print list of commands */
- if ((ret = send_description(fd, cmd_struct, "server", 0)) < 0)
- return ret;
- mmd_lock();
- handler = para_strdup(selectors[mmd->selector_num].name);
- cmd = selectors[mmd->selector_num].cmd_list;
- mmd_unlock();
- ret = send_description(fd, cmd, handler, 0);
- free(handler);
+ ret = lls(lls_check_arg_count(lpr, 0, 1, &errctx));
+ if (ret < 0) {
+ send_errctx(cc, errctx);
return ret;
}
+ if (lls_num_inputs(lpr) == 0)
+ return send_list_of_commands(cc);
/* argument given for help */
- cmd = get_cmd_ptr(argv[1], &handler);
- if (!cmd) {
- free(handler);
- return -E_BAD_CMD;
+ ret = lls(lls_lookup_subcmd(lls_input(0, lpr), server_cmd_suite,
+ &errctx));
+ if (ret < 0) {
+ send_errctx(cc, errctx);
+ return ret;
}
- perms = cmd_perms_itohuman(cmd->perms);
- ret = send_va_buffer(fd,
- "NAME\n\t%s - %s\n"
- "SYNOPSIS\n\t para_client %s\n"
- "DESCRIPTION\n%s\n"
- "HANDLER\n"
- "This command is handled by %s.\n\n"
- "PERMISSIONS\n"
- "Needed privileges for %s: %s\n",
- argv[1],
- cmd->description,
- cmd->synopsis,
- cmd->help,
- handler,
- argv[1],
- perms
- );
- free(perms);
- free(handler);
- return ret;
+ cmd = lls_cmd(ret, server_cmd_suite);
+ perms = server_command_perms_txt[ret];
+ long_help = lls_long_help(cmd);
+ assert(long_help);
+ ret = xasprintf(&buf, "%spermissions: %s\n", long_help, perms);
+ free(long_help);
+ return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false);
}
+EXPORT_SERVER_CMD_HANDLER(help);
-/* hup */
-static int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv)
+static int com_hup(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
kill(getppid(), SIGHUP);
return 1;
}
+EXPORT_SERVER_CMD_HANDLER(hup);
-/* term */
-static int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv)
+static int com_term(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
kill(getppid(), SIGTERM);
return 1;
}
+EXPORT_SERVER_CMD_HANDLER(term);
-static int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv)
+static int com_play(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
- mmd_lock();
- mmd->new_afs_status_flags |= AFS_PLAYING;
- mmd->new_afs_status_flags &= ~AFS_NOMORE;
- mmd_unlock();
+ mutex_lock(mmd_mutex);
+ mmd->new_vss_status_flags |= VSS_PLAYING;
+ mmd->new_vss_status_flags &= ~VSS_NOMORE;
+ mutex_unlock(mmd_mutex);
return 1;
-
}
+EXPORT_SERVER_CMD_HANDLER(play);
-/* stop */
-static int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv)
+static int com_stop(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
- mmd_lock();
- mmd->new_afs_status_flags &= ~AFS_PLAYING;
- mmd->new_afs_status_flags &= ~AFS_REPOS;
- mmd->new_afs_status_flags |= AFS_NEXT;
- mmd_unlock();
+ mutex_lock(mmd_mutex);
+ mmd->new_vss_status_flags &= ~VSS_PLAYING;
+ mmd->new_vss_status_flags &= ~VSS_REPOS;
+ mmd->new_vss_status_flags |= VSS_NEXT;
+ mutex_unlock(mmd_mutex);
return 1;
}
+EXPORT_SERVER_CMD_HANDLER(stop);
-/* pause */
-static int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv)
+static int com_pause(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
- mmd_lock();
- if (!afs_paused())
+ mutex_lock(mmd_mutex);
+ if (!vss_paused() && !vss_stopped()) {
mmd->events++;
- mmd->new_afs_status_flags &= ~AFS_PLAYING;
- mmd->new_afs_status_flags &= ~AFS_NEXT;
- mmd_unlock();
- return 1;
-}
-
-static int com_chs(int fd, int argc, char **argv)
-{
- int i, ret;
-
- if (argc == 1) {
- char *selector;
- mmd_lock();
- selector = para_strdup(selectors[mmd->selector_num].name);
- mmd_unlock();
- ret = send_va_buffer(fd, "%s\n", selector);
- free(selector);
- return ret;
+ mmd->new_vss_status_flags &= ~VSS_PLAYING;
+ mmd->new_vss_status_flags &= ~VSS_NEXT;
}
- for (i = 0; selectors[i].name; i++) {
- if (strcmp(selectors[i].name, argv[1]))
- continue;
- mmd_lock();
- mmd->selector_change = i;
- mmd->events++;
- mmd_unlock();
- return 1;
- }
- return -E_BAD_SELECTOR;
+ mutex_unlock(mmd_mutex);
+ return 1;
}
+EXPORT_SERVER_CMD_HANDLER(pause);
-/* next */
-static int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv)
+static int com_next(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
- mmd_lock();
+ mutex_lock(mmd_mutex);
mmd->events++;
- mmd->new_afs_status_flags |= AFS_NEXT;
- mmd_unlock();
+ mmd->new_vss_status_flags |= VSS_NEXT;
+ mutex_unlock(mmd_mutex);
return 1;
}
+EXPORT_SERVER_CMD_HANDLER(next);
-/* nomore */
-static int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv)
+static int com_nomore(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- if (argc != 1)
- return -E_COMMAND_SYNTAX;
- mmd_lock();
- if (afs_playing() || afs_paused())
- mmd->new_afs_status_flags |= AFS_NOMORE;
- mmd_unlock();
+ mutex_lock(mmd_mutex);
+ if (vss_playing() || vss_paused())
+ mmd->new_vss_status_flags |= VSS_NOMORE;
+ mutex_unlock(mmd_mutex);
return 1;
}
+EXPORT_SERVER_CMD_HANDLER(nomore);
-/* ff */
-static int com_ff(__a_unused int socket_fd, int argc, char **argv)
+static int com_ff(__a_unused struct command_context *cc,
+ struct lls_parse_result *lpr)
{
long promille;
int ret, backwards = 0;
unsigned i;
- char c;
+ char c, *errctx;
- if (argc != 2)
- return -E_COMMAND_SYNTAX;
- if (!(ret = sscanf(argv[1], "%u%c", &i, &c)))
+ ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
+ if (ret < 0) {
+ send_errctx(cc, errctx);
+ return ret;
+ }
+ if (!(ret = sscanf(lls_input(0, lpr), "%u%c", &i, &c)))
return -E_COMMAND_SYNTAX;
if (ret > 1 && c == '-')
backwards = 1; /* jmp backwards */
- mmd_lock();
+ mutex_lock(mmd_mutex);
ret = -E_NO_AUDIO_FILE;
- if (!mmd->chunks_total || !mmd->seconds_total)
+ if (!mmd->afd.afhi.chunks_total || !mmd->afd.afhi.seconds_total)
goto out;
- promille = (1000 * mmd->current_chunk) / mmd->chunks_total;
+ promille = (1000 * mmd->current_chunk) / mmd->afd.afhi.chunks_total;
if (backwards)
- promille -= 1000 * i / mmd->seconds_total;
+ promille -= 1000 * i / mmd->afd.afhi.seconds_total;
else
- promille += 1000 * i / mmd->seconds_total;
+ promille += 1000 * i / mmd->afd.afhi.seconds_total;
if (promille < 0)
promille = 0;
- if (promille > 1000) {
- mmd->new_afs_status_flags |= AFS_NEXT;
+ if (promille > 1000) {
+ mmd->new_vss_status_flags |= VSS_NEXT;
goto out;
}
- mmd->repos_request = (mmd->chunks_total * promille) / 1000;
- mmd->new_afs_status_flags |= AFS_REPOS;
- mmd->new_afs_status_flags &= ~AFS_NEXT;
+ mmd->repos_request = (mmd->afd.afhi.chunks_total * promille) / 1000;
+ mmd->new_vss_status_flags |= VSS_REPOS;
+ mmd->new_vss_status_flags &= ~VSS_NEXT;
mmd->events++;
ret = 1;
out:
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
return ret;
}
+EXPORT_SERVER_CMD_HANDLER(ff);
-/* jmp */
-static int com_jmp(__a_unused int socket_fd, int argc, char **argv)
+static int com_jmp(__a_unused struct command_context *cc,
+ struct lls_parse_result *lpr)
{
long unsigned int i;
int ret;
+ char *errctx;
- if (argc != 2)
- return -E_COMMAND_SYNTAX;
- if (sscanf(argv[1], "%lu", &i) <= 0)
- return -E_COMMAND_SYNTAX;
- mmd_lock();
+ ret = lls(lls_check_arg_count(lpr, 1, 1, &errctx));
+ if (ret < 0) {
+ send_errctx(cc, errctx);
+ return ret;
+ }
+ if (sscanf(lls_input(0, lpr), "%lu", &i) <= 0)
+ return -ERRNO_TO_PARA_ERROR(EINVAL);
+ mutex_lock(mmd_mutex);
ret = -E_NO_AUDIO_FILE;
- if (!mmd->chunks_total)
+ if (!mmd->afd.afhi.chunks_total)
goto out;
if (i > 100)
i = 100;
PARA_INFO_LOG("jumping to %lu%%\n", i);
- mmd->repos_request = (mmd->chunks_total * i + 50)/ 100;
- PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
+ mmd->repos_request = (mmd->afd.afhi.chunks_total * i + 50) / 100;
+ PARA_INFO_LOG("sent: %lu, offset before jmp: %li\n",
mmd->chunks_sent, mmd->offset);
- mmd->new_afs_status_flags |= AFS_REPOS;
- mmd->new_afs_status_flags &= ~AFS_NEXT;
+ mmd->new_vss_status_flags |= VSS_REPOS;
+ mmd->new_vss_status_flags &= ~VSS_NEXT;
ret = 1;
mmd->events++;
out:
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
return ret;
}
+EXPORT_SERVER_CMD_HANDLER(jmp);
-/*
- * check if perms are sufficient to exec a command having perms cmd_perms.
- * Returns 0 if perms are sufficient, -E_PERM otherwise.
- */
-static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
+/* deprecated, does nothing */
+static int com_tasks(__a_unused struct command_context *cc,
+ __a_unused struct lls_parse_result *lpr)
{
- PARA_DEBUG_LOG("%s", "checking permissions\n");
- return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
+ return 1;
}
+EXPORT_SERVER_CMD_HANDLER(tasks);
-/*
- * Parse first string from *cmd and lookup in table of valid commands.
- * On error, NULL is returned.
- */
-static struct server_command *parse_cmd(const char *cmdstr)
+static void reset_signals(void)
{
- char buf[255];
- int n = 0;
-
- sscanf(cmdstr, "%200s%n", buf, &n);
- if (!n)
- return NULL;
- buf[n] = '\0';
- return get_cmd_ptr(buf, NULL);
+ para_sigaction(SIGCHLD, SIG_IGN);
+ para_sigaction(SIGINT, SIG_DFL);
+ para_sigaction(SIGTERM, SIG_DFL);
+ para_sigaction(SIGHUP, SIG_DFL);
}
-long int para_rand(long unsigned max)
-{
- return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
-}
+struct connection_features {
+ int dummy; /* none at the moment */
+};
-static void init_rc4_keys(void)
+static int parse_auth_request(char *buf, int len, struct user **u,
+ struct connection_features *cf)
{
- int i;
-
- for (i = 0; i < 2 * RC4_KEY_LEN; i++)
- rc4_buf[i] = para_rand(256);
- PARA_DEBUG_LOG("rc4 keys initialized (%u:%u)\n",
- (unsigned char) rc4_buf[0],
- (unsigned char) rc4_buf[RC4_KEY_LEN]);
- RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf);
- RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
+ int ret;
+ char *p, *username, **features = NULL;
+ size_t auth_rq_len = strlen(AUTH_REQUEST_MSG);
+
+ *u = NULL;
+ memset(cf, 0, sizeof(*cf));
+ if (len < auth_rq_len + 2)
+ return -E_AUTH_REQUEST;
+ if (strncmp(buf, AUTH_REQUEST_MSG, auth_rq_len) != 0)
+ return -E_AUTH_REQUEST;
+ username = buf + auth_rq_len;
+ p = strchr(username, ' ');
+ if (p) {
+ int i;
+ if (p == username)
+ return -E_AUTH_REQUEST;
+ *p = '\0';
+ p++;
+ create_argv(p, ",", &features);
+ for (i = 0; features[i]; i++) {
+ if (strcmp(features[i], "sideband") == 0)
+ continue;
+ if (strcmp(features[i], "aes_ctr128") == 0)
+ continue;
+ else {
+ ret = -E_BAD_FEATURE;
+ goto out;
+ }
+ }
+ }
+ PARA_DEBUG_LOG("received auth request for user %s\n", username);
+ *u = lookup_user(username);
+ ret = 1;
+out:
+ free_argv(features);
+ return ret;
}
-static void rc4_recv(unsigned long len, const unsigned char *indata,
- unsigned char *outdata, __a_unused void *private_data)
-{
- RC4(&rc4_recv_key, len, indata, outdata);
-}
+#define HANDSHAKE_BUFSIZE 4096
-static void rc4_send(unsigned long len, const unsigned char *indata,
- unsigned char *outdata, __a_unused void *private_data)
+static int run_command(struct command_context *cc, struct iovec *iov)
{
- RC4(&rc4_send_key, len, indata, outdata);
+ int ret, i, argc;
+ char *p, *end, **argv;
+ const struct lls_command *lcmd = NULL;
+ unsigned perms;
+ struct lls_parse_result *lpr;
+ char *errctx;
+
+ if (iov->iov_base == NULL || iov->iov_len == 0)
+ return -ERRNO_TO_PARA_ERROR(EINVAL);
+ p = iov->iov_base;
+ p[iov->iov_len - 1] = '\0'; /* just to be sure */
+
+ ret = lls(lls_lookup_subcmd(p, server_cmd_suite, &errctx));
+ if (ret < 0) {
+ send_errctx(cc, errctx);
+ return ret;
+ }
+ perms = server_command_perms[ret];
+ if ((perms & cc->u->perms) != perms)
+ return -E_PERM;
+ lcmd = lls_cmd(ret, server_cmd_suite);
+ end = iov->iov_base + iov->iov_len;
+ for (i = 0; p < end; i++)
+ p += strlen(p) + 1;
+ argc = i;
+ argv = para_malloc((argc + 1) * sizeof(char *));
+ for (i = 0, p = iov->iov_base; p < end; i++) {
+ argv[i] = para_strdup(p);
+ p += strlen(p) + 1;
+ }
+ argv[argc] = NULL;
+ PARA_NOTICE_LOG("calling com_%s() for user %s\n",
+ lls_command_name(lcmd), cc->u->name);
+ ret = lls(lls_parse(argc, argv, lcmd, &lpr, &errctx));
+ if (ret >= 0) {
+ const struct server_cmd_user_data *ud = lls_user_data(lcmd);
+ ret = ud->handler(cc, lpr);
+ lls_free_parse_result(lpr, lcmd);
+ } else
+ send_errctx(cc, errctx);
+ free_argv(argv);
+ mutex_lock(mmd_mutex);
+ mmd->num_commands++;
+ if (ret >= 0 && (perms & AFS_WRITE))
+ mmd->events++;
+ mutex_unlock(mmd_mutex);
+ return ret;
}
-int handle_connect(int fd, struct sockaddr_in *addr)
+/**
+ * Perform user authentication and execute a command.
+ *
+ * \param fd The file descriptor to send output to.
+ *
+ * Whenever para_server accepts an incoming tcp connection on the port it
+ * listens on, it forks and the resulting child calls this function.
+ *
+ * An RSA-based challenge/response is used to authenticate the peer. It that
+ * authentication succeeds, a random session key is generated and sent back to
+ * the peer, encrypted with its RSA public key. From this point on, all
+ * transfers are crypted with this session key.
+ *
+ * Next it is checked if the peer supplied a valid server command or a command
+ * for the audio file selector. If yes, and if the user has sufficient
+ * permissions to execute that command, the function calls the corresponding
+ * command handler which does argument checking and further processing.
+ *
+ * In order to cope with DOS attacks, a timeout is set up which terminates
+ * the function if the connection was not authenticated when the timeout
+ * expires.
+ *
+ * \sa alarm(2), \ref crypt.c, \ref crypt.h.
+ */
+int handle_connect(int fd)
{
- int numbytes, ret, argc, use_rc4 = 0;
- char buf[STRINGSIZE];
- unsigned char crypt_buf[MAXLINE];
- struct user u;
- struct server_command *cmd = NULL;
- long unsigned challenge_nr, chall_response;
- char **argv = NULL;
- char *p, *command = NULL;
-
- signal(SIGCHLD, SIG_IGN);
- signal(SIGINT, SIG_DFL);
- signal(SIGTERM, SIG_DFL);
- signal(SIGHUP, SIG_DFL);
- signal(SIGUSR1, SIG_IGN);
-
- in_addr = addr;
- challenge_nr = random();
+ int ret;
+ unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN];
+ unsigned char challenge_hash[HASH_SIZE];
+ char *command = NULL, *buf = para_malloc(HANDSHAKE_BUFSIZE) /* must be on the heap */;
+ size_t numbytes;
+ struct command_context cc_struct = {.u = NULL}, *cc = &cc_struct;
+ struct iovec iov;
+ struct connection_features cf;
+
+ cc->scc.fd = fd;
+ reset_signals();
+ /* we need a blocking fd here as recv() might return EAGAIN otherwise. */
+ ret = mark_fd_blocking(fd);
+ if (ret < 0)
+ goto net_err;
/* send Welcome message */
- ret = send_va_buffer(fd, "This is para_server, version "
- PACKAGE_VERSION ".\n" );
+ ret = write_va_buffer(fd, "This is para_server, version "
+ PACKAGE_VERSION ".\n"
+ "Features: sideband,aes_ctr128\n"
+ );
if (ret < 0)
- goto err_out;
+ goto net_err;
/* recv auth request line */
- ret = recv_buffer(fd, buf, sizeof(buf));
+ ret = recv_buffer(fd, buf, HANDSHAKE_BUFSIZE);
if (ret < 0)
- goto err_out;
- if (ret <= 6) {
- ret = -E_AUTH;
- goto err_out;
- }
- numbytes = ret;
- ret = -E_AUTH;
- if (strncmp(buf, "auth ", 5))
- goto err_out;
-
- if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9))
- u.name = para_strdup(buf + 5); /* client version < 0.2.6 */
- else {
- u.name = para_strdup(buf + 9); /* client version >= 0.2.6 */
- use_rc4 = 1;
- }
- PARA_DEBUG_LOG("received %s request for user %s\n",
- use_rc4? "rc4" : "auth", u.name);
- if ((ret = lookup_user(&u)) < 0)
- goto err_out;
- if (!ret) { /* user not found */
- PARA_WARNING_LOG("auth request for unknown user %s\n", u.name);
- ret = -E_BAD_USER;
- goto err_out;
+ goto net_err;
+ ret = parse_auth_request(buf, ret, &cc->u, &cf);
+ if (ret < 0)
+ goto net_err;
+ if (cc->u) {
+ get_random_bytes_or_die(rand_buf, sizeof(rand_buf));
+ ret = pub_encrypt(cc->u->pubkey, rand_buf, sizeof(rand_buf),
+ (unsigned char *)buf);
+ if (ret < 0)
+ goto net_err;
+ numbytes = ret;
+ } else {
+ /*
+ * We don't want to reveal our user names, so we send a
+ * challenge to the client even if the user does not exist, and
+ * fail the authentication later.
+ */
+ numbytes = 256;
+ get_random_bytes_or_die((unsigned char *)buf, numbytes);
}
- ret = para_encrypt_challenge(u.rsa, challenge_nr, crypt_buf);
- if (ret <= 0)
- goto err_out;
- numbytes = ret;
- PARA_DEBUG_LOG("sending %d byte challenge\n", numbytes);
- /* We can't use send_buffer here since buf may contain null bytes */
- ret = send_bin_buffer(fd,(char *) crypt_buf, numbytes);
+ PARA_DEBUG_LOG("sending %d byte challenge + session key (%zu bytes)\n",
+ CHALLENGE_SIZE, numbytes);
+ ret = send_sb(&cc->scc, buf, numbytes, SBD_CHALLENGE, false);
+ buf = NULL;
if (ret < 0)
- goto err_out;
- /* recv decrypted number */
- numbytes = recv_buffer(fd, buf, sizeof(buf));
- ret = numbytes;
+ goto net_err;
+ ret = recv_sb(&cc->scc, SBD_CHALLENGE_RESPONSE,
+ HANDSHAKE_BUFSIZE, &iov);
if (ret < 0)
- goto err_out;
- ret = -E_AUTH;
- if (!numbytes)
- goto err_out;
- if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1
- || chall_response != challenge_nr)
- goto err_out;
- /* auth successful. Send 'Proceed' message */
- PARA_INFO_LOG("good auth for %s (%lu)\n", u.name, challenge_nr);
- sprintf(buf, "%s", PROCEED_MSG);
- if (use_rc4) {
- init_rc4_keys();
- ret = para_encrypt_buffer(u.rsa, rc4_buf, 2 * RC4_KEY_LEN,
- (unsigned char *)buf + PROCEED_MSG_LEN + 1);
- if (ret <= 0)
- goto err_out;
- numbytes = ret + strlen(PROCEED_MSG) + 1;
- } else
- numbytes = strlen(buf);
- ret = send_bin_buffer(fd, buf, numbytes);
+ goto net_err;
+ buf = iov.iov_base;
+ numbytes = iov.iov_len;
+ PARA_DEBUG_LOG("received %zu bytes challenge response\n", numbytes);
+ ret = -E_BAD_USER;
+ if (!cc->u)
+ goto net_err;
+ /*
+ * The correct response is the hash of the first CHALLENGE_SIZE bytes
+ * of the random data.
+ */
+ ret = -E_BAD_AUTH;
+ if (numbytes != HASH_SIZE)
+ goto net_err;
+ hash_function((char *)rand_buf, CHALLENGE_SIZE, challenge_hash);
+ if (memcmp(challenge_hash, buf, HASH_SIZE))
+ goto net_err;
+ /* auth successful */
+ alarm(0);
+ PARA_INFO_LOG("good auth for %s\n", cc->u->name);
+ /* init stream cipher keys with the second part of the random buffer */
+ cc->scc.recv = sc_new(rand_buf + CHALLENGE_SIZE, SESSION_KEY_LEN);
+ cc->scc.send = sc_new(rand_buf + CHALLENGE_SIZE + SESSION_KEY_LEN,
+ SESSION_KEY_LEN);
+ ret = send_sb(&cc->scc, NULL, 0, SBD_PROCEED, false);
if (ret < 0)
- goto err_out;
- if (use_rc4)
- enable_crypt(fd, rc4_recv, rc4_send, NULL);
- /* read command */
- while ((numbytes = recv_buffer(fd, buf, sizeof(buf))) > 0) {
-// PARA_INFO_LOG("recvd: %s (%d)\n", buf, numbytes);
- ret = -E_COMMAND_SYNTAX;
- if (command && numbytes + strlen(command) > STRINGSIZE) /* DOS */
- goto err_out;
- command = para_strcat(command, buf);
- if ((p = strstr(command, EOC_MSG))) {
- *p = '\0';
- break;
- }
- }
- ret = numbytes;
+ goto net_err;
+ ret = recv_sb(&cc->scc, SBD_COMMAND, MAX_COMMAND_LEN, &iov);
if (ret < 0)
- goto err_out;
- ret = -E_BAD_CMD;
- /* parse command */
- if (!(cmd = parse_cmd(command)))
- goto err_out;
- /* valid command, check permissions */
- ret = check_perms(u.perms, cmd);
+ goto net_err;
+ ret = run_command(cc, &iov);
+ free(iov.iov_base);
if (ret < 0)
goto err_out;
- /* valid command and sufficient perms */
- alarm(0);
- argc = split_args(command, &argv, "\n");
- mmd_lock();
- mmd->num_commands++;
- mmd_unlock();
- PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u.name,
- inet_ntoa(addr->sin_addr));
- ret = cmd->handler(fd, argc, argv);
- if (ret >= 0) {
- ret = EXIT_SUCCESS;
+ if (ret >= 0)
goto out;
- }
err_out:
- if (ret != -E_SEND && ret != -E_RECV) {
- PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
- send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret));
- }
- ret = EXIT_FAILURE;
+ if (send_strerror(cc, -ret) >= 0)
+ send_sb(&cc->scc, NULL, 0, SBD_EXIT__FAILURE, true);
+net_err:
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
out:
+ free(buf);
free(command);
- free(argv);
- mmd_lock();
- if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
- mmd->events++;
+ mutex_lock(mmd_mutex);
mmd->active_connections--;
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
+ if (ret >= 0) {
+ ret = send_sb(&cc->scc, NULL, 0, SBD_EXIT__SUCCESS, true);
+ if (ret < 0)
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
+ }
+ sc_free(cc->scc.recv);
+ sc_free(cc->scc.send);
return ret;
}