-/*
- * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file server.c Paraslash's main server. */
-
-/** \mainpage Paraslash API Reference
- *
- * Starting points for getting an overview are
- *
- * probably:
- *
- * - The main programs: \ref server.c, \ref audiod.c, \ref client.c,
- * \ref audioc.c, \ref fsck.c
- * - Server: \ref server_command, \ref sender,
- * - Audio file selector: \ref audio_format_handler, \ref mood, \ref afs_table,
- * - Client: \ref receiver, \ref receiver_node, \ref filter, \ref filter_node
- *
- *
- * The gory details, listed by topic:
- *
- * - Audio format handlers: \ref mp3_afh.c, \ref ogg_afh.c \ref aac_afh.c
- * - Decoders: \ref mp3dec.c, \ref \ref oggdec.c, \ref aacdec.c
- * - Volume normalizer: \ref compress.c
- * - Output: \ref alsa_write.c, \ref osx_write.c
- * - http: \ref http_recv.c, \ref http_send.c
- * - ortp: \ref ortp_recv.c, \ref ortp_send.c
- * - dccp: \ref dccp_recv.c, \ref dccp_send.c
- * - Audio file selector: \ref afs.c, \ref aft.c, \ref mood.c
- * - Afs structures: \ref afs_table, \ref audio_file_data,
- * \ref afs_info \ref audio_format_info,
- * - Afs tables: \ref aft.c, \ref mood.c, \ref playlist.c,
- * \ref attribute.c, \ref score.c.
- *
- * Lower levels:
- *
- * - Scheduling: \ref sched.c, \ref sched.h
- * - Networking: \ref net.c,
- * - File descriptors: \ref fd.c,
- * - Signals: \ref signal.c,
- * - Daemons: \ref daemon.c,
- * - Strings: \ref string.c, string.h
- * - Time: \ref time.c, time.h
- * - Spawning processes: \ref exec.c
- * - Inter process communication: ipc.c,
- * - The object storage layer: \ref osl.c,
- * - Blob tables: blob.c,
- * - Queueing chunks of audio data: \ref chunk_queue.c
- * - The error subssystem: \ref error.h
- *
- * Lov-level data structures:
- *
- * - Doubly linked lists: \ref list.h,
- * - Red-black trees: \ref rbtree.h, \ref rbtree.c
- * - Ring buffer: \ref ringbuffer.c, \ref ringbuffer.h
- * - Hashing: \ref hash.h, \ref sha1.h, \ref sha1.c
- * - Crypto: \ref crypt.c
+/**
+ * \mainpage Main data structures and selected APIs:
*
+ * - Senders: \ref sender,
+ * - Audio file selector: \ref afs_info, \ref afs_table,
+ * - Audio format handler: \ref audio_format_handler, \ref afh_info
+ * - Receivers/filters/writers: \ref receiver, \ref receiver_node,
+ * \ref filter, \ref filter_node, \ref writer_node, \ref writer.
+ * - Scheduling: \ref sched.h,
+ * - Buffer trees: \ref buffer_tree.h,
+ * - Sideband API: \ref sideband.h,
+ * - Crypto: \ref crypt.h, \ref crypt_backend.h,
+ * - Error subsystem: \ref error.h,
+ * - Inter process communication: \ref ipc.h,
+ * - Forward error correction: \ref fec.h,
+ * - Daemons: \ref daemon.h,
+ * - Mixer API: \ref mix.h,
+ * - Interactive sessions: \ref interactive.h,
+ * - File descriptors: \ref fd.h,
+ * - Signals: \ref signal.h,
+ * - Networking: \ref net.h,
+ * - Time: \ref time.c,
+ * - Doubly linked lists: \ref list.h.
*/
+#include <netinet/in.h>
+#include <sys/socket.h>
#include <signal.h>
+#include <regex.h>
+#include <osl.h>
#include <sys/types.h>
-#include <dirent.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 "server.cmdline.h"
+#include "crypt.h"
#include "afh.h"
#include "string.h"
#include "afs.h"
+#include "net.h"
#include "server.h"
+#include "list.h"
+#include "send.h"
+#include "sched.h"
#include "vss.h"
#include "config.h"
#include "close_on_fork.h"
-#include "send.h"
-#include "net.h"
#include "daemon.h"
#include "ipc.h"
#include "fd.h"
-#include "list.h"
-#include "sched.h"
#include "signal.h"
#include "user_list.h"
+#include "color.h"
+#include "version.h"
-/** define the array of error lists needed by para_server */
-INIT_SERVER_ERRLISTS;
+/** Array of error strings. */
+DEFINE_PARA_ERRLIST;
-/** shut down non-authorized connections after that many seconds */
+__printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
+
+/** Shut down non-authorized connections after that many seconds. */
#define ALARM_TIMEOUT 10
/**
* Pointer to shared memory area for communication between para_server
- * and its children. Exported to vss.c. command.c and to afs.
+ * and its children. Exported to vss.c, command.c and to afs.
*/
struct misc_meta_data *mmd;
/**
- * the configuration of para_server
+ * The active value for all config options of para_server.
*
- * It also contains the options for the audio file selector, audio format
- * handler and all supported senders.
+ * It is computed by merging the parse result of the command line options with
+ * the parse result of the config file.
*/
-struct server_args_info conf;
-
-/** the file containing user information (public key, permissions) */
-char *user_list_file = NULL;
-
-extern void dccp_send_init(struct sender *);
-extern void http_send_init(struct sender *);
-extern void ortp_send_init(struct sender *);
-
-/** the list of supported senders */
-struct sender senders[] = {
- {
- .name = "http",
- .init = http_send_init,
- },
- {
- .name = "dccp",
- .init = dccp_send_init,
- },
-#ifdef HAVE_ORTP
- {
- .name = "ortp",
- .init = ortp_send_init,
- },
-#endif
- {
- .name = NULL,
- }
-};
+struct lls_parse_result *server_lpr = NULL;
+/* Command line options (no config file options). Used in handle_sighup(). */
+static struct lls_parse_result *cmdline_lpr;
-/* global variables for server-internal use */
-static FILE *logfile;
-static int mmd_mutex, mmd_shm_id;
-static int signal_pipe;
+/**
+ * A random number used to "authenticate" the afs connection.
+ *
+ * para_server picks this number by random before it forks the afs process. The
+ * command handlers know this number as well and write it to the afs socket,
+ * together with the id of the shared memory area which contains the payload of
+ * the afs command. A local process has to know this number to abuse the afs
+ * service provided by the local socket.
+ */
+uint32_t afs_socket_cookie;
+
+/** The mutex protecting the shared memory area containing the mmd struct. */
+int mmd_mutex;
+
+/* Serializes log output. */
+static int log_mutex;
+
+static struct sched sched;
+static struct signal_task *signal_task;
+
+/** The process id of the audio file selector process. */
+pid_t afs_pid = 0;
+
+/* The the main server process (parent of afs and the command handlers). */
+static pid_t server_pid;
/**
- * para_server's log function
+ * Tell whether the executing process is a command handler.
+ *
+ * Cleanup on exit must be performed differently for command handlers.
*
- * \param ll the log level
- * \param fmt the format string describing the log message
+ * \return True if the pid of the executing process is neither the server pid
+ * nor the afs pid.
*/
-void para_log(int ll, const char* fmt,...)
+bool process_is_command_handler(void)
{
- va_list argp;
- FILE *outfd;
- struct tm *tm;
- time_t t1;
- char str[MAXLINE] = "";
- pid_t mypid;
-
- if (ll < conf.loglevel_arg)
- return;
- outfd = logfile? logfile : stderr;
- time(&t1);
- tm = localtime(&t1);
- strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
- fprintf(outfd, "%s ", str);
- if (conf.loglevel_arg <= INFO)
- fprintf(outfd, "%i: ", ll);
- mypid = getpid();
- if (conf.loglevel_arg <= INFO)
- fprintf(outfd, "(%d) ", mypid);
- va_start(argp, fmt);
- vfprintf(outfd, fmt, argp);
- va_end(argp);
+ pid_t pid = getpid();
+
+ return pid != afs_pid && pid != server_pid;
}
-/*
- * setup shared memory area and get mutex for locking
+/** The task responsible for server command handling. */
+struct server_command_task {
+ /** TCP port on which para_server listens for connections. */
+ int listen_fd;
+ /* File descriptor for the accepted socket. */
+ int child_fd;
+ /** Copied from para_server's main function. */
+ int argc;
+ /** Argument vector passed to para_server's main function. */
+ char **argv;
+ /** The command task structure for scheduling. */
+ struct task *task;
+};
+
+/**
+ * Return the list of tasks for the server process.
+ *
+ * This is called from \a com_tasks(). The helper is necessary since command
+ * handlers can not access the scheduler structure directly.
+ *
+ * \return A dynamically allocated string that must be freed by the caller.
*/
-static void shm_init(void)
+char *server_get_tasks(void)
+{
+ return get_task_list(&sched);
+}
+
+static void pre_log_hook(void)
+{
+ mutex_lock(log_mutex);
+}
+
+static void post_log_hook(void)
+{
+ mutex_unlock(log_mutex);
+}
+
+/* Setup shared memory area and init mutexes */
+static void init_ipc_or_die(void)
{
void *shm;
- int ret = shm_new(sizeof(struct misc_meta_data));
+ int shmid, ret = shm_new(sizeof(struct misc_meta_data));
if (ret < 0)
goto err_out;
-
- ret = shm_attach(ret, ATTACH_RW, &shm);
+ shmid = ret;
+ ret = shm_attach(shmid, ATTACH_RW, &shm);
+ shm_destroy(shmid);
if (ret < 0)
goto err_out;
mmd = shm;
- mmd_shm_id = ret;
ret = mutex_new();
if (ret < 0)
goto err_out;
mmd_mutex = ret;
+ ret = mutex_new();
+ if (ret < 0)
+ goto destroy_mmd_mutex;
+ log_mutex = ret;
mmd->num_played = 0;
mmd->num_commands = 0;
mmd->events = 0;
mmd->num_connects = 0;
mmd->active_connections = 0;
- strcpy(mmd->afd.path, "(none)");
mmd->vss_status_flags = VSS_NEXT;
mmd->new_vss_status_flags = VSS_NEXT;
- mmd->sender_cmd_data.cmd_num = -1;
return;
+destroy_mmd_mutex:
+ mutex_destroy(mmd_mutex);
err_out:
- PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
exit(EXIT_FAILURE);
}
/**
- * lock the shared memory area containing the mmd struct
+ * (Re-)read the server configuration files.
*
- * \sa semop(2), struct misc_meta_data.
- */
-void mmd_lock(void)
-{
- mutex_lock(mmd_mutex);
-}
-
-/**
- * unlock the shared memory area containing the mmd struct
+ * \param reload Whether config file overrides command line.
*
- * \sa semop(2), struct misc_meta_data
+ * This function also re-opens the logfile and the user list. On SIGHUP it is
+ * called from both server and afs context.
*/
-
-void mmd_unlock(void)
+void parse_config_or_die(bool reload)
{
- mutex_unlock(mmd_mutex);
-}
-
-static void parse_config(int override)
-{
- char *home = para_homedir();
- struct stat statbuf;
int ret;
- char *cf;
+ char *cf = NULL, *errctx = NULL, *user_list_file = NULL;
+ void *map;
+ size_t sz;
+ int cf_argc;
+ char **cf_argv;
+ struct lls_parse_result *cf_lpr, *merged_lpr;
+ char *home = para_homedir();
- if (conf.config_file_given)
- cf = para_strdup(conf.config_file_arg);
+ if (OPT_GIVEN(CONFIG_FILE))
+ cf = para_strdup(OPT_STRING_VAL(CONFIG_FILE));
else
cf = make_message("%s/.paraslash/server.conf", home);
- free(user_list_file);
- if (!conf.user_list_given)
- user_list_file = make_message("%s/.paraslash/server.users", home);
- else
- user_list_file = para_strdup(conf.user_list_arg);
- ret = stat(cf, &statbuf);
- if (ret && conf.config_file_given) {
- ret = -1;
- PARA_EMERG_LOG("can not stat config file %s\n", cf);
- goto out;
+ if (!mmd || getpid() != afs_pid) {
+ if (OPT_GIVEN(USER_LIST))
+ user_list_file = para_strdup(OPT_STRING_VAL(USER_LIST));
+ else
+ user_list_file = make_message("%s/.paraslash/server.users", home);
}
- if (!ret) {
- int tmp = conf.daemon_given;
- struct server_cmdline_parser_params params = {
- .override = override,
- .initialize = 0,
- .check_required = 0,
- .check_ambiguity = 0
- };
- server_cmdline_parser_config_file(cf, &conf, ¶ms);
- conf.daemon_given = tmp;
+ free(home);
+ ret = mmap_full_file(cf, O_RDONLY, &map, &sz, NULL);
+ if (ret < 0) {
+ if (ret != -E_EMPTY && ret != -ERRNO_TO_PARA_ERROR(ENOENT))
+ goto free_cf;
+ if (ret == -ERRNO_TO_PARA_ERROR(ENOENT) && OPT_GIVEN(CONFIG_FILE))
+ goto free_cf;
+ server_lpr = cmdline_lpr;
+ goto success;
}
- /* logfile */
- if (!conf.logfile_given && conf.daemon_given) {
- ret = -1;
- PARA_EMERG_LOG("%s", "daemon, but no log file\n");
- goto out;
+ ret = lls(lls_convert_config(map, sz, NULL, &cf_argv, &errctx));
+ para_munmap(map, sz);
+ if (ret < 0)
+ goto free_cf;
+ cf_argc = ret;
+ ret = lls(lls_parse(cf_argc, cf_argv, CMD_PTR, &cf_lpr, &errctx));
+ lls_free_argv(cf_argv);
+ if (ret < 0)
+ goto free_cf;
+ if (reload) /* config file overrides command line */
+ ret = lls(lls_merge(cf_lpr, cmdline_lpr, CMD_PTR, &merged_lpr,
+ &errctx));
+ else /* command line options override config file options */
+ ret = lls(lls_merge(cmdline_lpr, cf_lpr, CMD_PTR, &merged_lpr,
+ &errctx));
+ lls_free_parse_result(cf_lpr, CMD_PTR);
+ if (ret < 0)
+ goto free_cf;
+ if (server_lpr != cmdline_lpr)
+ lls_free_parse_result(server_lpr, CMD_PTR);
+ server_lpr = merged_lpr;
+success:
+ daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
+ if (OPT_GIVEN(LOGFILE)) {
+ daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
+ daemon_open_log_or_die();
+ }
+ if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
+ COLOR_NO, OPT_GIVEN(LOGFILE))) {
+ int i;
+ for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
+ daemon_set_log_color_or_die(lls_string_val(i,
+ OPT_RESULT(LOG_COLOR)));
}
- if (conf.logfile_given)
- logfile = open_log(conf.logfile_arg);
+ daemon_set_flag(DF_LOG_PID);
+ daemon_set_flag(DF_LOG_LL);
+ daemon_set_flag(DF_LOG_TIME);
+ if (OPT_GIVEN(LOG_TIMING))
+ daemon_set_flag(DF_LOG_TIMING);
+ daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
+ if (user_list_file)
+ user_list_init(user_list_file);
ret = 1;
-out:
+free_cf:
free(cf);
- free(home);
- if (ret > 0)
- return;
free(user_list_file);
- user_list_file = NULL;
- exit(EXIT_FAILURE);
+ if (ret < 0) {
+ if (errctx)
+ PARA_ERROR_LOG("%s\n", errctx);
+ free(errctx);
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
+ }
}
-static void setup_signal_handling(void)
+/*
+ * called when server gets SIGHUP or when client invokes hup command.
+ */
+static void handle_sighup(void)
{
- int ret = 0;
-
- signal_pipe = para_signal_init();
- PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
- ret += para_install_sighandler(SIGINT);
- ret += para_install_sighandler(SIGTERM);
- ret += para_install_sighandler(SIGHUP);
- ret += para_install_sighandler(SIGCHLD);
- ret += para_install_sighandler(SIGUSR1);
- signal(SIGPIPE, SIG_IGN);
- if (ret != 5) {
- PARA_EMERG_LOG("%s", "could not install signal handlers\n");
- exit(EXIT_FAILURE);
- }
+
+ PARA_NOTICE_LOG("SIGHUP\n");
+ parse_config_or_die(true);
+ if (afs_pid != 0)
+ kill(afs_pid, SIGHUP);
}
-static unsigned init_network(void)
+static int signal_post_select(struct sched *s, __a_unused void *context)
{
- int fd, ret = init_tcp_socket(conf.port_arg);
+ int ret, signum;
+ ret = task_get_notification(signal_task->task);
if (ret < 0)
- goto err;
- fd = ret;
- ret = mark_fd_nonblock(fd);
- if (ret < 0)
- goto err;
- return fd;
-err:
- PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
- exit(EXIT_FAILURE);
+ return ret;
+ signum = para_next_signal(&s->rfds);
+ switch (signum) {
+ case 0:
+ return 0;
+ case SIGHUP:
+ handle_sighup();
+ break;
+ case SIGCHLD:
+ for (;;) {
+ pid_t pid;
+ ret = para_reap_child(&pid);
+ if (ret <= 0)
+ break;
+ if (pid != afs_pid)
+ continue;
+ PARA_EMERG_LOG("fatal: afs died\n");
+ kill(0, SIGTERM);
+ goto cleanup;
+ }
+ break;
+ /* die on sigint/sigterm. Kill all children too. */
+ case SIGINT:
+ case SIGTERM:
+ PARA_EMERG_LOG("terminating on signal %d\n", signum);
+ kill(0, SIGTERM);
+ /*
+ * We must wait for all of our children to die. For the afs
+ * process or a command handler might want to use the
+ * shared memory area and the mmd mutex. If we destroy this
+ * mutex too early and afs tries to lock the shared memory
+ * area, the call to mutex_lock() will fail and terminate the
+ * afs process. This leads to dirty osl tables.
+ */
+ PARA_INFO_LOG("waiting for child processes to die\n");
+ mutex_unlock(mmd_mutex);
+ while (wait(NULL) != -1 || errno != ECHILD)
+ ; /* still at least one child alive */
+ mutex_lock(mmd_mutex);
+cleanup:
+ free(mmd->afd.afhi.chunk_table);
+ task_notify_all(s, E_DEADLY_SIGNAL);
+ return -E_DEADLY_SIGNAL;
+ }
+ return 0;
+}
+
+static void init_signal_task(void)
+{
+ signal_task = signal_init_or_die();
+ para_install_sighandler(SIGINT);
+ para_install_sighandler(SIGTERM);
+ para_install_sighandler(SIGHUP);
+ para_install_sighandler(SIGCHLD);
+ para_sigaction(SIGPIPE, SIG_IGN);
+ add_close_on_fork_list(signal_task->fd);
+ signal_task->task = task_register(&(struct task_info) {
+ .name = "signal",
+ .pre_select = signal_pre_select,
+ .post_select = signal_post_select,
+ .context = signal_task,
+
+ }, &sched);
}
-static void init_random_seed(void)
+static void command_pre_select(struct sched *s, void *context)
{
- int fd, ret = -1;
- unsigned int seed;
- size_t len = sizeof(unsigned int);
+ struct server_command_task *sct = context;
+ para_fd_set(sct->listen_fd, &s->rfds, &s->max_fileno);
+}
- fd = open("/dev/urandom", O_RDONLY);
- if (fd < 0)
+static int command_post_select(struct sched *s, void *context)
+{
+ struct server_command_task *sct = context;
+ int new_fd, ret, i;
+ char *peer_name;
+ pid_t child_pid;
+ uint32_t *chunk_table;
+
+ ret = task_get_notification(sct->task);
+ if (ret < 0)
+ return ret;
+ ret = para_accept(sct->listen_fd, &s->rfds, NULL, 0, &new_fd);
+ if (ret <= 0)
goto out;
- ret = -2;
- if (read(fd, &seed, len) != len)
+ mmd->num_connects++;
+ mmd->active_connections++;
+ /*
+ * The chunk table is a pointer located in the mmd struct that points
+ * to dynamically allocated memory, i.e. it must be freed by the parent
+ * and the child. However, as the mmd struct is in a shared memory
+ * area, there's no guarantee that after the fork this pointer is still
+ * valid in child context. As it is not used in the child anyway, we
+ * save it to a local variable before the fork and free the memory via
+ * that copy in the child directly after the fork.
+ */
+ chunk_table = mmd->afd.afhi.chunk_table;
+ child_pid = fork();
+ if (child_pid < 0) {
+ ret = -ERRNO_TO_PARA_ERROR(errno);
goto out;
- srandom(seed);
- ret = 1;
+ }
+ if (child_pid) {
+ /* avoid problems with non-fork-safe PRNGs */
+ unsigned char buf[16];
+ get_random_bytes_or_die(buf, sizeof(buf));
+ close(new_fd);
+ /* parent keeps accepting connections */
+ return 0;
+ }
+ peer_name = remote_name(new_fd);
+ PARA_INFO_LOG("accepted connection from %s\n", peer_name);
+ /* mmd might already have changed at this point */
+ free(chunk_table);
+ sct->child_fd = new_fd;
+ /*
+ * put info on who we are serving into argv[0] to make
+ * client ip visible in top/ps
+ */
+ for (i = sct->argc - 1; i >= 0; i--)
+ memset(sct->argv[i], 0, strlen(sct->argv[i]));
+ i = sct->argc - 1 - lls_num_inputs(cmdline_lpr);
+ sprintf(sct->argv[i], "para_server (serving %s)", peer_name);
+ /* ask other tasks to terminate */
+ task_notify_all(s, E_CHILD_CONTEXT);
+ /*
+ * After we return, the scheduler calls server_select() with a minimal
+ * timeout value, because the remaining tasks have a notification
+ * pending. Next it calls the ->post_select method of these tasks,
+ * which will return negative in view of the notification. This causes
+ * schedule() to return as there are no more runnable tasks.
+ *
+ * Note that semaphores are not inherited across a fork(), so we don't
+ * hold the lock at this point. Since server_select() drops the lock
+ * prior to calling para_select(), we need to acquire it here.
+ */
+ mutex_lock(mmd_mutex);
+ return -E_CHILD_CONTEXT;
out:
- if (fd >= 0)
- close(fd);
- if (ret > 0)
- return;
- PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
- ret);
- exit(EXIT_FAILURE);
+ if (ret < 0)
+ PARA_CRIT_LOG("%s\n", para_strerror(-ret));
+ return 0;
}
-uint32_t afs_socket_cookie;
-int afs_socket;
-static pid_t afs_pid;
+static void init_server_command_task(struct server_command_task *sct,
+ int argc, char **argv)
+{
+ int ret;
-static void init_afs(void)
+ PARA_NOTICE_LOG("initializing tcp command socket\n");
+ sct->child_fd = -1;
+ sct->argc = argc;
+ sct->argv = argv;
+ ret = para_listen_simple(IPPROTO_TCP, OPT_UINT32_VAL(PORT));
+ if (ret < 0)
+ goto err;
+ sct->listen_fd = ret;
+ ret = mark_fd_nonblocking(sct->listen_fd);
+ if (ret < 0)
+ goto err;
+ add_close_on_fork_list(sct->listen_fd); /* child doesn't need the listener */
+ sct->task = task_register(&(struct task_info) {
+ .name = "server command",
+ .pre_select = command_pre_select,
+ .post_select = command_post_select,
+ .context = sct,
+ }, &sched);
+ return;
+err:
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
+}
+
+static int init_afs(int argc, char **argv)
{
int ret, afs_server_socket[2];
+ char c;
- ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket);
+ ret = socketpair(PF_UNIX, SOCK_STREAM, 0, afs_server_socket);
if (ret < 0)
exit(EXIT_FAILURE);
- afs_socket_cookie = para_random((uint32_t)-1);
+ get_random_bytes_or_die((unsigned char *)&afs_socket_cookie,
+ sizeof(afs_socket_cookie));
afs_pid = fork();
if (afs_pid < 0)
exit(EXIT_FAILURE);
- if (!afs_pid) { /* child (afs) */
+ if (afs_pid == 0) { /* child (afs) */
+ int i;
+
+ afs_pid = getpid();
+ crypt_shutdown();
+ user_list_deplete();
+ for (i = argc - 1; i >= 0; i--)
+ memset(argv[i], 0, strlen(argv[i]));
+ i = argc - lls_num_inputs(cmdline_lpr) - 1;
+ sprintf(argv[i], "para_server (afs)");
close(afs_server_socket[0]);
- afs_init(afs_socket_cookie, afs_server_socket[1]);
+ afs_init(afs_server_socket[1]);
}
close(afs_server_socket[1]);
- afs_socket = afs_server_socket[0];
- ret = mark_fd_nonblock(afs_socket);
+ if (read(afs_server_socket[0], &c, 1) <= 0) {
+ PARA_EMERG_LOG("early afs exit\n");
+ exit(EXIT_FAILURE);
+ }
+ ret = mark_fd_nonblocking(afs_server_socket[0]);
if (ret < 0)
exit(EXIT_FAILURE);
- add_close_on_fork_list(afs_socket);
- PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n", afs_socket,
- (unsigned) afs_socket_cookie);
+ add_close_on_fork_list(afs_server_socket[0]);
+ PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n",
+ afs_server_socket[0], (unsigned) afs_socket_cookie);
+ return afs_server_socket[0];
}
+static void handle_help_flags(void)
+{
+ char *help;
+ bool d = OPT_GIVEN(DETAILED_HELP);
+
+ if (d)
+ help = lls_long_help(CMD_PTR);
+ else if (OPT_GIVEN(HELP))
+ help = lls_short_help(CMD_PTR);
+ else
+ return;
+ printf("%s\n", help);
+ free(help);
+ exit(EXIT_SUCCESS);
+}
-static unsigned do_inits(int argc, char **argv)
+static void server_init(int argc, char **argv, struct server_command_task *sct)
{
- /* connector's address information */
- int sockfd;
+ int ret, afs_socket, daemon_pipe = -1;
+ char *errctx;
- init_random_seed();
+ valid_fd_012();
/* parse command line options */
- server_cmdline_parser(argc, argv, &conf);
- HANDLE_VERSION_FLAG("server", conf);
- para_drop_privileges(conf.user_arg, conf.group_arg);
- /* parse config file, open log and set defaults */
- parse_config(0);
- log_welcome("para_server", conf.loglevel_arg);
- shm_init(); /* init mmd struct */
- server_uptime(UPTIME_SET); /* reset server uptime */
- init_user_list(user_list_file);
+ ret = lls(lls_parse(argc, argv, CMD_PTR, &cmdline_lpr, &errctx));
+ if (ret < 0)
+ goto fail;
+ server_lpr = cmdline_lpr;
+ daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
+ daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
+ OPT_STRING_VAL(GROUP));
+ version_handle_flag("server", OPT_GIVEN(VERSION));
+ handle_help_flags();
+ parse_config_or_die(false);
/* become daemon */
- if (conf.daemon_given)
- daemon_init();
- PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
+ if (OPT_GIVEN(DAEMON))
+ daemon_pipe = daemonize(true /* parent waits for SIGTERM */);
+ server_pid = getpid();
+ crypt_init();
+ daemon_log_welcome("server");
+ init_ipc_or_die(); /* init mmd struct, mmd and log mutex */
+ daemon_set_start_time();
+ daemon_set_hooks(pre_log_hook, post_log_hook);
+ PARA_NOTICE_LOG("initializing audio format handlers\n");
afh_init();
- vss_init();
- mmd->server_pid = getpid();
- setup_signal_handling();
- init_afs();
- mmd_lock();
- /* init network socket */
- PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
- sockfd = init_network();
- PARA_NOTICE_LOG("%s", "init complete\n");
- return sockfd;
-}
-/*
- * called when server gets SIGHUP or when client invokes hup command.
- */
-static void handle_sighup(void)
-{
- PARA_NOTICE_LOG("%s", "SIGHUP\n");
- close_log(logfile); /* gets reopened if necessary by parse_config */
- logfile = NULL;
- parse_config(1); /* reopens log */
- init_user_list(user_list_file); /* reload user list */
- if (afs_pid)
- kill(afs_pid, SIGHUP);
+ /*
+ * Although afs uses its own signal handling we must ignore SIGUSR1
+ * _before_ the afs child process gets born by init_afs() below. It's
+ * racy to do this in the child because the parent might send SIGUSR1
+ * before the child gets a chance to ignore this signal.
+ *
+ * We also have to block SIGCHLD before the afs process is created
+ * because otherwise para_server does not notice if afs dies before the
+ * SIGCHLD handler has been installed for the parent process by
+ * init_signal_task() below.
+ */
+ para_sigaction(SIGUSR1, SIG_IGN);
+ para_block_signal(SIGCHLD);
+ PARA_NOTICE_LOG("initializing the audio file selector\n");
+ afs_socket = init_afs(argc, argv);
+ init_signal_task();
+ para_unblock_signal(SIGCHLD);
+ PARA_NOTICE_LOG("initializing virtual streaming system\n");
+ vss_init(afs_socket, &sched);
+ init_server_command_task(sct, argc, argv);
+ if (daemon_pipe >= 0) {
+ if (write(daemon_pipe, "\0", 1) < 0) {
+ PARA_EMERG_LOG("daemon_pipe: %s", strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ close(daemon_pipe);
+ }
+ PARA_NOTICE_LOG("server init complete\n");
+ return;
+fail:
+ assert(ret < 0);
+ if (errctx)
+ PARA_ERROR_LOG("%s\n", errctx);
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
}
static void status_refresh(void)
{
static int prev_uptime = -1, prev_events = -1;
- int uptime = server_uptime(UPTIME_GET), ret = 1;
+ int uptime = daemon_get_uptime(now);
if (prev_events != mmd->events)
goto out;
if (mmd->new_vss_status_flags != mmd->vss_status_flags)
- goto out;
+ goto out_inc_events;
if (uptime / 60 != prev_uptime / 60)
- goto out;
- ret = 0;
+ goto out_inc_events;
+ return;
+out_inc_events:
+ mmd->events++;
out:
prev_uptime = uptime;
prev_events = mmd->events;
mmd->vss_status_flags = mmd->new_vss_status_flags;
- if (ret) {
- PARA_DEBUG_LOG("%d events, forcing status update\n",
- mmd->events);
- killpg(0, SIGUSR1);
- }
+ PARA_DEBUG_LOG("%u events, forcing status update\n", mmd->events);
+ killpg(0, SIGUSR1);
+}
+
+static int server_select(int max_fileno, fd_set *readfds, fd_set *writefds,
+ struct timeval *timeout_tv)
+{
+ int ret;
+
+ status_refresh();
+ mutex_unlock(mmd_mutex);
+ ret = para_select(max_fileno + 1, readfds, writefds, timeout_tv);
+ mutex_lock(mmd_mutex);
+ return ret;
}
/**
- * the main function of para_server
+ * Deallocate all lopsub parse results.
*
- * \param argc usual argument count
- * \param argv usual argument vector
+ * The server allocates a parse result for command line options and optionally
+ * a second parse result for the effective configuration, defined by merging
+ * the command line options with the options stored in the configuration file.
+ * This function frees both structures.
+ */
+void free_lpr(void)
+{
+ lls_free_parse_result(server_lpr, CMD_PTR);
+ if (server_lpr != cmdline_lpr)
+ lls_free_parse_result(cmdline_lpr, CMD_PTR);
+}
+
+/**
+ * The main function of para_server.
*
- * \return EXIT_SUCCESS or EXIT_FAILURE
+ * \param argc Usual argument count.
+ * \param argv Usual argument vector.
*
+ * \return EXIT_SUCCESS or EXIT_FAILURE.
*/
int main(int argc, char *argv[])
{
- /* listen on sock_fd, new connection on new_fd */
- int sockfd, new_fd;
- struct sockaddr_in their_addr;
- int i, max_fileno, ret;
- pid_t chld_pid;
- fd_set rfds, wfds;
- struct timeval *timeout;
-
- valid_fd_012();
- sockfd = do_inits(argc, argv);
-repeat:
- FD_ZERO(&rfds);
- FD_ZERO(&wfds);
- max_fileno = -1;
- /* check socket and signal pipe in any case */
- para_fd_set(sockfd, &rfds, &max_fileno);
- para_fd_set(signal_pipe, &rfds, &max_fileno);
- timeout = vss_preselect(&rfds, &wfds, &max_fileno);
- status_refresh();
- for (i = 0; senders[i].name; i++) {
- if (senders[i].status != SENDER_ON)
- continue;
- if (!senders[i].pre_select)
- continue;
- senders[i].pre_select(&max_fileno, &rfds, &wfds);
- }
- mmd_unlock();
- ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
- mmd_lock();
- vss_post_select(&rfds, &wfds);
- if (ret < 0)
- goto repeat;
- for (i = 0; senders[i].name; i++) {
- if (senders[i].status != SENDER_ON)
- continue;
- if (!senders[i].post_select)
- continue;
- senders[i].post_select(&rfds, &wfds);
- }
- vss_send_chunk();
- status_refresh();
- if (FD_ISSET(signal_pipe, &rfds)) {
- int sig;
- pid_t pid;
- sig = para_next_signal();
- switch (sig) {
- case SIGHUP:
- handle_sighup();
- break;
- case SIGCHLD:
- for (;;) {
- ret = para_reap_child(&pid);
- if (ret <= 0)
- break;
- if (pid != afs_pid)
- continue;
- PARA_EMERG_LOG("fatal: afs died\n");
- goto genocide;
- }
- break;
- /* die on sigint/sigterm. Kill all children too. */
- case SIGINT:
- case SIGTERM:
- PARA_EMERG_LOG("terminating on signal %d\n", sig);
-genocide:
- kill(0, SIGTERM);
- mutex_destroy(mmd_mutex);
- shm_detach(mmd);
- shm_destroy(mmd_shm_id);
+ int ret;
+ struct server_command_task server_command_task_struct,
+ *sct = &server_command_task_struct;
- exit(EXIT_FAILURE);
- }
- }
- if (mmd->sender_cmd_data.cmd_num >= 0) {
- int num = mmd->sender_cmd_data.cmd_num,
- s = mmd->sender_cmd_data.sender_num;
+ sched.default_timeout.tv_sec = 1;
+ sched.select_function = server_select;
- if (senders[s].client_cmds[num])
- senders[s].client_cmds[num](&mmd->sender_cmd_data);
- mmd->sender_cmd_data.cmd_num = -1;
- }
- if (!FD_ISSET(sockfd, &rfds))
- goto repeat;
-
- new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
- if (new_fd < 0)
- goto repeat;
- PARA_INFO_LOG("got connection from %s, forking\n",
- inet_ntoa(their_addr.sin_addr));
- mmd->num_connects++;
- mmd->active_connections++;
- random();
- chld_pid = fork();
- if (chld_pid < 0) {
- PARA_CRIT_LOG("%s", "fork failed\n");
- goto repeat;
- }
- if (chld_pid) {
- close(new_fd);
- /* parent keeps accepting connections */
- goto repeat;
- }
- alarm(ALARM_TIMEOUT);
- close_listed_fds();
- close(sockfd); /* child doesn't need the listener */
+ server_init(argc, argv, sct);
+ mutex_lock(mmd_mutex);
+ ret = schedule(&sched);
/*
- * put info on who we are serving into argv[0] to make
- * client ip visible in top/ps
+ * We hold the mmd lock: it was re-acquired in server_select()
+ * after the select call.
*/
- for (i = argc - 1; i >= 0; i--)
- memset(argv[i], 0, strlen(argv[i]));
- sprintf(argv[0], "para_server (serving %s)",
- inet_ntoa(their_addr.sin_addr));
- return handle_connect(new_fd, &their_addr);
+ mutex_unlock(mmd_mutex);
+ sched_shutdown(&sched);
+ crypt_shutdown();
+ signal_shutdown(signal_task);
+ if (!process_is_command_handler()) { /* parent (server) */
+ mutex_destroy(mmd_mutex);
+ daemon_set_hooks(NULL, NULL); /* only one process remaining */
+ mutex_destroy(log_mutex);
+ deplete_close_on_fork_list();
+ if (ret < 0)
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ } else {
+ alarm(ALARM_TIMEOUT);
+ close_listed_fds();
+ ret = handle_connect(sct->child_fd);
+ }
+ vss_shutdown();
+ shm_detach(mmd);
+ user_list_deplete();
+ free_lpr();
+ exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
}
projects / paraslash.git / blobdiff