/*
- * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2012 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.
+ * Licensed under the GPL v2. For licencing details see COPYING.
*/
-/** \file command.c does client authentication and executes server commands */
+/** \file command.c Client authentication and server commands. */
+
+#include <regex.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <osl.h>
-#include <sys/time.h> /* gettimeofday */
+#include "para.h"
+#include "error.h"
+#include "crypt.h"
+#include "command.h"
#include "server.cmdline.h"
-#include "db.h"
+#include "string.h"
+#include "afh.h"
+#include "afs.h"
#include "server.h"
-#include "vss.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 "user_list.h"
#include "server_command_list.h"
+#include "afs_command_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];
+/** Commands including options must be shorter than this. */
+#define MAX_COMMAND_LEN 32768
-extern const char *status_item_list[NUM_STAT_ITEMS];
+extern int mmd_mutex;
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;
+int send_afs_status(struct stream_cipher_context *scc, int parser_friendly);
+
+const char *status_item_list[] = {STATUS_ITEM_ARRAY};
static void dummy(__a_unused int s)
-{}
+{
+}
static void mmd_dup(struct misc_meta_data *new_mmd)
{
- mmd_lock();
+ mutex_lock(mmd_mutex);
*new_mmd = *mmd;
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
}
/*
- * compute human readable string containing
- * vss status for given integer value
+ * Compute human readable string containing vss status for given integer value.
+ *
+ * We don't want to use vss_playing() and friends here because we take a
+ * snapshot of the mmd struct and use the copy for computing the state of the
+ * vss. If the real data were used, we would take the mmd lock for a rather
+ * long time or risk to get an inconsistent view.
*/
static char *vss_status_tohuman(unsigned int flags)
{
if (flags & VSS_PLAYING)
return para_strdup("playing");
- else if (flags & VSS_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.
*/
-char *cmd_perms_itohuman(unsigned int perms)
+static char *cmd_perms_itohuman(unsigned int perms)
{
char *msg = para_malloc(5 * sizeof(char));
- msg[0] = perms & DB_READ? 'a' : '-';
- msg[1] = perms & DB_WRITE? 'A' : '-';
+ msg[0] = perms & AFS_READ? 'a' : '-';
+ msg[1] = perms & AFS_WRITE? 'A' : '-';
msg[2] = perms & VSS_READ? 'v' : '-';
msg[3] = perms & VSS_WRITE? 'V' : '-';
msg[4] = '\0';
return msg;
}
-/*
- * compute status bar string. Never returns NULL
- */
-char *get_sb_string(struct misc_meta_data *nmmd)
+static char *get_status(struct misc_meta_data *nmmd, int parser_friendly)
{
- 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);
- return ret;
-}
-
-static char *get_status(struct misc_meta_data *nmmd)
-{
- char *bar, *ret, mtime[30] = "";
+ char mtime[30] = "";
char *status, *flags; /* vss status info */
- char *ut = uptime_str();
+ /* nobody updates our version of "now" */
+ char *ut = get_server_uptime_str(NULL);
long offset = (nmmd->offset + 500) / 1000;
- struct timeval now;
+ struct timeval current_time;
struct tm mtime_tm;
+ struct para_buffer b = {.flags = parser_friendly? PBF_SIZE_PREFIX : 0};
- if (nmmd->audio_format >= 0) {
- localtime_r(&nmmd->mtime, &mtime_tm);
- strftime(mtime, 29, "%a %b %d %Y", &mtime_tm);
- }
/* report real status */
status = vss_status_tohuman(nmmd->vss_status_flags);
flags = vss_get_status_flags(nmmd->vss_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
-
- );
- free(bar);
+ if (nmmd->size) { /* parent currently has an audio file open */
+ localtime_r(&nmmd->mtime, &mtime_tm);
+ strftime(mtime, 29, "%b %d %Y", &mtime_tm);
+ }
+ gettimeofday(¤t_time, NULL);
+ /*
+ * The calls to WRITE_STATUS_ITEM() below never fail because
+ * b->max_size is zero (unlimited), see 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_FILE_SIZE, "%zu\n", nmmd->size / 1024);
+ (void)WRITE_STATUS_ITEM(&b, SI_MTIME, "%s\n", mtime);
+ (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);
free(ut);
- return ret;
+ return b.buf;
}
-static int check_sender_args(int argc, char **argv, struct sender_command_data *scd)
+static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
{
int i;
/* this has to match sender.h */
if (!subcmds[i])
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:
break;
case SENDER_DENY:
case SENDER_ALLOW:
- if (argc != 4 && argc != 5)
+ if (argc != 4 || parse_cidr(argv[3], scd->host,
+ sizeof(scd->host), &scd->netmask) == NULL)
return -E_COMMAND_SYNTAX;
- if (!inet_aton(argv[3], &scd->addr))
- 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)
- return -E_COMMAND_SYNTAX;
- if (!inet_aton(argv[3], &scd->addr))
+ if (argc != 4)
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(argv[3], scd);
default:
return -E_COMMAND_SYNTAX;
}
return 1;
}
-int com_sender(int fd, int argc, char **argv)
+int com_sender(struct stream_cipher_context *scc, int argc, char * const * argv)
{
int i, ret;
+ 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);
free(msg);
msg = tmp;
}
- ret = send_buffer(fd, msg);
+ ret = sc_send_buffer(scc, msg);
free(msg);
return ret;
}
ret = check_sender_args(argc, argv, &scd);
if (ret < 0) {
- char *msg;
if (scd.sender_num < 0)
return ret;
msg = senders[scd.sender_num].help();
- send_buffer(fd, msg);
+ ret = sc_send_buffer(scc, msg);
free(msg);
- return 1;
+ return ret;
}
+
+ switch (scd.cmd_num) {
+ case SENDER_ADD:
+ case SENDER_DELETE:
+ assert(senders[scd.sender_num].resolve_target);
+ ret = senders[scd.sender_num].resolve_target(argv[3], &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();
+ mutex_unlock(mmd_mutex);
usleep(100 * 1000);
continue;
}
- mmd->sender_cmd_data = scd;
- mmd_unlock();
+ memcpy(&mmd->sender_cmd_data, &scd, sizeof(scd));
+ mutex_unlock(mmd_mutex);
break;
}
return (i < 10)? 1 : -E_LOCK;
}
/* server info */
-int com_si(int fd, int argc, __a_unused char **argv)
+int com_si(struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
int i, ret;
char *ut;
- char *selector_string = NULL, *sender_info = NULL, *sender_list = NULL;
+ char *sender_info = NULL;
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, " ");
- }
+ mutex_lock(mmd_mutex);
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 = get_server_uptime_str(now);
+ ret = sc_send_va_buffer(scc, "version: " GIT_VERSION "\n"
+ "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"
+ "current loglevel: %s\n"
"supported audio formats: %s\n"
- "supported senders: %s\n"
"%s",
ut, mmd->num_played,
- getppid(),
+ (int)getppid(),
+ (int)mmd->afs_pid,
mmd->active_connections,
mmd->num_commands,
mmd->num_connects,
conf.loglevel_arg,
- selector_string,
- supported_audio_formats(),
- sender_list,
+ SERVER_AUDIO_FORMATS,
sender_info
);
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
free(ut);
- free(selector_string);
- free(sender_list);
free(sender_info);
return ret;
}
/* version */
-int com_version(int socket_fd, int argc, __a_unused char **argv)
+int com_version(struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
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"
- );
-}
-
-/* sc */
-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;
+ return sc_send_buffer(scc, VERSION_TEXT("server")
+ "built: " BUILD_DATE "\n"
+ UNAME_RS ", " CC_VERSION "\n"
+ );
}
-/* sb */
-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;
+#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(AMPLIFICATION)
+
+/**
+ * Write a list of audio-file related status items with empty values.
+ *
+ * This is used by vss when currently no audio file is open.
+ */
+static char *empty_status_items(int parser_friendly)
+{
+ if (parser_friendly)
+ return make_message(
+ #define ITEM(x) "0004 %02x:\n"
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ #define ITEM(x) , SI_ ## x
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ );
+ return make_message(
+ #define ITEM(x) "%s:\n"
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ #define ITEM(x) ,status_item_list[SI_ ## x]
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ );
}
+#undef EMPTY_STATUS_ITEMS
/* stat */
-int com_stat(int socket_fd, int argc, char **argv)
+int com_stat(struct stream_cipher_context *scc, int argc, char * const * argv)
{
- int ret, num = 0;/* status will be printed that many
- * times. num <= 0 means: print forever
- */
+ int i, ret;
struct misc_meta_data tmp, *nmmd = &tmp;
char *s;
+ int32_t num = 0;
+ int parser_friendly = 0;
- signal(SIGUSR1, dummy);
+ para_sigaction(SIGUSR1, dummy);
- if (argc > 1)
- num = atoi(argv[1]);
+ for (i = 1; i < argc; i++) {
+ const char *arg = argv[i];
+ if (arg[0] != '-')
+ break;
+ if (!strcmp(arg, "--")) {
+ i++;
+ break;
+ }
+ if (!strncmp(arg, "-n=", 3)) {
+ ret = para_atoi32(arg + 3, &num);
+ if (ret < 0)
+ return ret;
+ continue;
+ }
+ if (!strcmp(arg, "-p")) {
+ parser_friendly = 1;
+ continue;
+ }
+ return -E_COMMAND_SYNTAX;
+ }
+ if (i != argc)
+ return -E_COMMAND_SYNTAX;
for (;;) {
-
mmd_dup(nmmd);
- s = get_status(nmmd);
- ret = send_buffer(socket_fd, s);
+ s = get_status(nmmd, parser_friendly);
+ ret = sc_send_buffer(scc, s);
free(s);
if (ret < 0)
goto out;
+ if (nmmd->vss_status_flags & VSS_NEXT) {
+ static char *esi;
+ if (!esi)
+ esi = empty_status_items(parser_friendly);
+ ret = sc_send_buffer(scc, esi);
+ if (ret < 0)
+ goto out;
+ } else
+ send_afs_status(scc, parser_friendly);
ret = 1;
- if (num == 1)
+ if (num > 0 && !--num)
goto out;
sleep(50);
if (getppid() == 1)
return ret;
}
-static int send_list_of_commands(int fd, struct server_command *cmd,
+static int send_list_of_commands(struct stream_cipher_context *scc, struct server_command *cmd,
const char *handler)
{
int ret, i;
for (i = 1; cmd->name; cmd++, i++) {
char *perms = cmd_perms_itohuman(cmd->perms);
- ret = send_va_buffer(fd, "%s\t%s\t%s\t%s\n", cmd->name,
+ ret = sc_send_va_buffer(scc, "%s\t%s\t%s\t%s\n", cmd->name,
handler,
perms,
cmd->description);
return 1;
}
-/* always returns string that must be freed by the caller in handler */
-static struct server_command *get_cmd_ptr(char *name, char **handler)
+/* returns string that must be freed by the caller */
+static struct server_command *get_cmd_ptr(const char *name, char **handler)
{
struct server_command *cmd;
for (cmd = server_cmds; cmd->name; cmd++)
if (!strcmp(cmd->name, name)) {
if (handler)
- *handler = para_strdup("para_server"); /* server commands */
+ *handler = para_strdup("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))
+ /* not found, look for commands supported by afs */
+ for (cmd = afs_cmds; cmd->name; cmd++)
+ if (!strcmp(cmd->name, name)) {
+ if (handler)
+ *handler = para_strdup("afs");
return cmd;
+ }
return NULL;
}
/* help */
-int com_help(int fd, int argc, char **argv)
+int com_help(struct stream_cipher_context *scc, int argc, char * const * argv)
{
struct server_command *cmd;
char *perms, *handler;
if (argc < 2) {
/* no argument given, print list of commands */
- if ((ret = send_list_of_commands(fd, server_cmds, "server")) < 0)
+ if ((ret = send_list_of_commands(scc, server_cmds, "server")) < 0)
return ret;
- mmd_lock();
- handler = para_strdup(selectors[mmd->selector_num].name);
- cmd = selectors[mmd->selector_num].cmd_list;
- mmd_unlock();
- ret = send_list_of_commands(fd, cmd, handler);
- free(handler);
- return ret;
+ return send_list_of_commands(scc, afs_cmds, "afs");
}
/* argument given for help */
cmd = get_cmd_ptr(argv[1], &handler);
- if (!cmd) {
- free(handler);
+ if (!cmd)
return -E_BAD_CMD;
- }
perms = cmd_perms_itohuman(cmd->perms);
- ret = send_va_buffer(fd,
+ ret = sc_send_va_buffer(scc,
"%s - %s\n\n"
"handler: %s\n"
"permissions: %s\n"
}
/* hup */
-int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv)
+int com_hup(__a_unused struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
if (argc != 1)
return -E_COMMAND_SYNTAX;
}
/* term */
-int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv)
+int com_term(__a_unused struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
if (argc != 1)
return -E_COMMAND_SYNTAX;
return 1;
}
-int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv)
+int com_play(__a_unused struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
if (argc != 1)
return -E_COMMAND_SYNTAX;
- mmd_lock();
+ mutex_lock(mmd_mutex);
mmd->new_vss_status_flags |= VSS_PLAYING;
mmd->new_vss_status_flags &= ~VSS_NOMORE;
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
return 1;
}
/* stop */
-int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv)
+int com_stop(__a_unused struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
if (argc != 1)
return -E_COMMAND_SYNTAX;
- mmd_lock();
+ 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;
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
return 1;
}
/* pause */
-int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv)
+int com_pause(__a_unused struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
if (argc != 1)
return -E_COMMAND_SYNTAX;
- mmd_lock();
- if (!vss_paused())
+ mutex_lock(mmd_mutex);
+ if (!vss_paused() && !vss_stopped()) {
mmd->events++;
- mmd->new_vss_status_flags &= ~VSS_PLAYING;
- mmd->new_vss_status_flags &= ~VSS_NEXT;
- mmd_unlock();
- return 1;
-}
-
-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;
}
/* next */
-int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv)
+int com_next(__a_unused struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
if (argc != 1)
return -E_COMMAND_SYNTAX;
- mmd_lock();
+ mutex_lock(mmd_mutex);
mmd->events++;
mmd->new_vss_status_flags |= VSS_NEXT;
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
return 1;
}
/* nomore */
-int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv)
+int com_nomore(__a_unused struct stream_cipher_context *scc, int argc, __a_unused char * const * argv)
{
if (argc != 1)
return -E_COMMAND_SYNTAX;
- mmd_lock();
+ mutex_lock(mmd_mutex);
if (vss_playing() || vss_paused())
mmd->new_vss_status_flags |= VSS_NOMORE;
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
return 1;
}
/* ff */
-int com_ff(__a_unused int socket_fd, int argc, char **argv)
+int com_ff(__a_unused struct stream_cipher_context *scc, int argc, char * const * argv)
{
long promille;
int ret, backwards = 0;
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_vss_status_flags |= VSS_NEXT;
goto out;
}
- mmd->repos_request = (mmd->chunks_total * promille) / 1000;
+ 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;
}
/* jmp */
-int com_jmp(__a_unused int socket_fd, int argc, char **argv)
+int com_jmp(__a_unused struct stream_cipher_context *scc, int argc, char * const * argv)
{
long unsigned int i;
int ret;
return -E_COMMAND_SYNTAX;
if (sscanf(argv[1], "%lu", &i) <= 0)
return -E_COMMAND_SYNTAX;
- mmd_lock();
+ 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;
+ mmd->repos_request = (mmd->afd.afhi.chunks_total * i + 50)/ 100;
PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
mmd->chunks_sent, mmd->offset);
mmd->new_vss_status_flags |= VSS_REPOS;
ret = 1;
mmd->events++;
out:
- mmd_unlock();
+ mutex_unlock(mmd_mutex);
return ret;
}
*/
static int check_perms(unsigned int perms, struct server_command *cmd_ptr)
{
- PARA_DEBUG_LOG("%s", "checking permissions\n");
+ PARA_DEBUG_LOG("checking permissions\n");
return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
}
return get_cmd_ptr(buf, NULL);
}
-long int para_rand(long unsigned max)
+static int read_command(struct stream_cipher_context *scc, char **result)
{
- return (long int) ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
-}
+ int ret;
+ char buf[4096];
+ char *command = NULL;
-static void init_rc4_keys(void)
-{
- int i;
+ for (;;) {
+ size_t numbytes;
+ char *p;
- 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);
-}
+ ret = sc_recv_buffer(scc, buf, sizeof(buf));
+ if (ret < 0)
+ goto out;
+ if (!ret)
+ break;
+ numbytes = ret;
+ ret = -E_COMMAND_SYNTAX;
+ if (command && numbytes + strlen(command) > MAX_COMMAND_LEN) /* DOS */
+ goto out;
+ command = para_strcat(command, buf);
+ p = strstr(command, EOC_MSG);
+ if (p) {
+ *p = '\0';
+ break;
+ }
+ }
+ ret = command? 1 : -E_COMMAND_SYNTAX;
+out:
+ if (ret < 0)
+ free(command);
+ else
+ *result = command;
+ 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);
}
-static void rc4_send(unsigned long len, const unsigned char *indata,
- unsigned char *outdata, __a_unused void *private_data)
+static void reset_signals(void)
{
- RC4(&rc4_send_key, len, indata, outdata);
+ para_sigaction(SIGCHLD, SIG_IGN);
+ para_sigaction(SIGINT, SIG_DFL);
+ para_sigaction(SIGTERM, SIG_DFL);
+ para_sigaction(SIGHUP, SIG_DFL);
}
-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.
+ * \param peername Identifies the connecting peer.
+ *
+ * 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 a DOS attacks, a timeout is set up
+ * which terminates the function if the connection was not
+ * authenticated when the timeout expires.
+ *
+ * \sa alarm(2), crypt.c, crypt.h
+ */
+__noreturn void handle_connect(int fd, const char *peername)
{
- int numbytes, ret, argc, use_rc4 = 0;
- char buf[STRINGSIZE];
- unsigned char crypt_buf[MAXLINE];
- struct user u;
+ int ret, argc;
+ char buf[4096];
+ unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN];
+ unsigned char challenge_hash[HASH_SIZE];
+ struct user *u;
struct server_command *cmd = NULL;
- long unsigned challenge_nr, chall_response;
char **argv = NULL;
char *p, *command = NULL;
+ size_t numbytes;
+ struct stream_cipher_context scc = {.fd = fd};
- 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();
+ 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" );
if (ret < 0)
- goto err_out;
+ goto net_err;
/* recv auth request line */
ret = recv_buffer(fd, buf, sizeof(buf));
if (ret < 0)
- goto err_out;
- if (ret <= 6) {
- ret = -E_AUTH;
- goto err_out;
+ goto net_err;
+ if (ret < 10) {
+ ret = -E_AUTH_REQUEST;
+ goto net_err;
}
- 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;
+ ret = -E_AUTH_REQUEST;
+ if (strncmp(buf, AUTH_REQUEST_MSG, strlen(AUTH_REQUEST_MSG)))
+ goto net_err;
+ p = buf + strlen(AUTH_REQUEST_MSG);
+ PARA_DEBUG_LOG("received auth request for user %s\n", p);
+ u = lookup_user(p);
+ if (u) {
+ get_random_bytes_or_die(rand_buf, sizeof(rand_buf));
+ ret = pub_encrypt(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);
}
- 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;
- 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 %u byte challenge + rc4 keys (%zu bytes)\n",
+ CHALLENGE_SIZE, numbytes);
+ ret = send_bin_buffer(fd, buf, numbytes);
if (ret < 0)
- goto err_out;
- /* recv decrypted number */
- numbytes = recv_buffer(fd, buf, sizeof(buf));
- ret = numbytes;
+ goto net_err;
+ /* recv challenge response */
+ ret = recv_bin_buffer(fd, buf, HASH_SIZE);
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;
+ numbytes = ret;
+ PARA_DEBUG_LOG("received %d bytes challenge response\n", ret);
+ ret = -E_BAD_USER;
+ if (!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", u->name);
+ /* init stream cipher keys with the second part of the random buffer */
+ scc.recv = sc_new(rand_buf + CHALLENGE_SIZE, SESSION_KEY_LEN);
+ scc.send = sc_new(rand_buf + CHALLENGE_SIZE + SESSION_KEY_LEN, SESSION_KEY_LEN);
+ ret = sc_send_buffer(&scc, PROCEED_MSG);
if (ret < 0)
+ goto net_err;
+ ret = read_command(&scc, &command);
+ if (ret == -E_COMMAND_SYNTAX)
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;
if (ret < 0)
- goto err_out;
+ goto net_err;
ret = -E_BAD_CMD;
- /* parse command */
- if (!(cmd = parse_cmd(command)))
+ cmd = parse_cmd(command);
+ if (!cmd)
goto err_out;
/* valid command, check permissions */
- ret = check_perms(u.perms, cmd);
+ ret = check_perms(u->perms, cmd);
if (ret < 0)
goto err_out;
/* valid command and sufficient perms */
- alarm(0);
- argc = split_args(command, &argv, "\n");
- mmd_lock();
+ ret = create_argv(command, "\n", &argv);
+ if (ret < 0)
+ goto err_out;
+ argc = ret;
+ PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u->name,
+ peername);
+ ret = cmd->handler(&scc, argc, argv);
+ free_argv(argv);
+ mutex_lock(mmd_mutex);
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;
+ mutex_unlock(mmd_mutex);
+ 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;
+ sc_send_va_buffer(&scc, "%s\n", para_strerror(-ret));
+net_err:
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
out:
free(command);
- free(argv);
- mmd_lock();
- if (cmd && (cmd->perms & DB_WRITE) && ret >= 0)
+ sc_free(scc.recv);
+ sc_free(scc.send);
+ mutex_lock(mmd_mutex);
+ if (cmd && (cmd->perms & AFS_WRITE) && ret >= 0)
mmd->events++;
mmd->active_connections--;
- mmd_unlock();
- return ret;
+ mutex_unlock(mmd_mutex);
+ exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
}