/**
* \mainpage Paraslash API Reference
*
- * Starting points for getting an overview are
+ * Starting points for getting an overview:
*
- * probably:
*
* - The main programs: \ref server.c, \ref audiod.c, \ref client.c,
- * \ref audioc.c, \ref fsck.c,
+ * \ref audioc.c, \ref fsck.c, \ref afh.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 oggdec.c, \ref aacdec.c,
- * - Volume normalizer: \ref compress.c,
+ * - Audio format handlers: \ref send_common.c \ref mp3_afh.c, \ref ogg_afh.c, \ref aac_afh.c,
+ * - Decoders: \ref mp3dec_filter.c, \ref oggdec_filter.c, \ref aacdec_filter.c,
+ * - Volume normalizer: \ref compress_filter.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,
*/
#include <signal.h>
-#include <sys/types.h>
#include <dirent.h>
#include "para.h"
#include "signal.h"
#include "user_list.h"
-/** define the array of error lists needed by para_server */
+/** Define the array of error lists needed by para_server. */
INIT_SERVER_ERRLISTS;
-/** shut down non-authorized connections after that many seconds */
+/** Shut down non-authorized connections after that many seconds. */
#define ALARM_TIMEOUT 10
/**
struct misc_meta_data *mmd;
/**
- * the configuration of para_server
+ * The configuration of para_server
*
* It also contains the options for the audio file selector, audio format
* handler and all supported senders.
*/
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,
- }
-};
+/** A random value used in child context for authentication. */
+uint32_t afs_socket_cookie;
+/** The mutex protecting the shared memory area containing the mmd struct. */
+int mmd_mutex;
/* global variables for server-internal use */
static FILE *logfile;
-static int mmd_mutex, mmd_shm_id;
-static int signal_pipe;
+/** The file containing user information (public key, permissions). */
+static char *user_list_file = NULL;
+static int mmd_shm_id;
+
+
+/** The task responsible for server command handling. */
+struct server_command_task {
+ /** TCP port on which para_server listens for connections. */
+ int listen_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;
+};
/**
- * para_server's log function
+ * Para_server's log function.
*
- * \param ll the log level
- * \param fmt the format string describing the log message
+ * \param ll The log level.
+ * \param fmt The format string describing the log message.
*/
void para_log(int ll, const char* fmt,...)
{
mmd->active_connections = 0;
mmd->vss_status_flags = VSS_NEXT;
mmd->new_vss_status_flags = VSS_NEXT;
- mmd->sender_cmd_data.cmd_num = -1;
return;
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
- *
- * \sa semop(2), struct misc_meta_data.
- */
-void mmd_lock(void)
-{
- mutex_lock(mmd_mutex);
-}
-
-/**
- * unlock the shared memory area containing the mmd struct
- *
- * \sa semop(2), struct misc_meta_data
- */
-
-void mmd_unlock(void)
-{
- mutex_unlock(mmd_mutex);
-}
-
static void parse_config(int override)
{
char *home = para_homedir();
struct server_cmdline_parser_params params = {
.override = override,
.initialize = 0,
- .check_required = 0,
- .check_ambiguity = 0
+ .check_required = 1,
+ .check_ambiguity = 0,
+ .print_errors = 1
};
server_cmdline_parser_config_file(cf, &conf, ¶ms);
conf.daemon_given = tmp;
}
- /* logfile */
- if (!conf.logfile_given && conf.daemon_given) {
- ret = -1;
- PARA_EMERG_LOG("fatal: daemon option, but no log file given\n");
- goto out;
- }
if (conf.logfile_given)
logfile = open_log(conf.logfile_arg);
ret = 1;
exit(EXIT_FAILURE);
}
-static void setup_signal_handling(void)
+static void signal_pre_select(struct sched *s, struct task *t)
+{
+ struct signal_task *st = container_of(t, struct signal_task, task);
+ para_fd_set(st->fd, &s->rfds, &s->max_fileno);
+}
+
+/*
+ * called when server gets SIGHUP or when client invokes hup command.
+ */
+static void handle_sighup(void)
+{
+ PARA_NOTICE_LOG("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 (mmd->afs_pid)
+ kill(mmd->afs_pid, SIGHUP);
+}
+
+static void signal_post_select(struct sched *s, struct task *t)
+{
+ struct signal_task *st = container_of(t, struct signal_task, task);
+
+ if (!FD_ISSET(st->fd, &s->rfds))
+ return;
+
+ st->signum = para_next_signal();
+ switch (st->signum) {
+ case SIGHUP:
+ handle_sighup();
+ break;
+ case SIGCHLD:
+ for (;;) {
+ pid_t pid;
+ int ret = para_reap_child(&pid);
+ if (ret <= 0)
+ break;
+ if (pid != mmd->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", st->signum);
+genocide:
+ kill(0, SIGTERM);
+ mutex_destroy(mmd_mutex);
+ shm_detach(mmd);
+ shm_destroy(mmd_shm_id);
+
+ exit(EXIT_FAILURE);
+ }
+}
+
+static void init_signal_task(void)
{
- signal_pipe = para_signal_init(); /* always successful */
+ static struct signal_task signal_task_struct,
+ *st = &signal_task_struct;
+
+ st->task.pre_select = signal_pre_select;
+ st->task.post_select = signal_post_select;
+ sprintf(st->task.status, "signal task");
+
+ st->fd = para_signal_init(); /* always successful */
PARA_NOTICE_LOG("setting up signal handlers\n");
if (para_install_sighandler(SIGINT) < 0)
goto err;
if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
goto err;
- add_close_on_fork_list(signal_pipe);
+ add_close_on_fork_list(st->fd);
+ register_task(&st->task);
return;
err:
PARA_EMERG_LOG("could not install signal handlers\n");
exit(EXIT_FAILURE);
}
-static unsigned init_network(void)
+static void command_pre_select(struct sched *s, struct task *t)
+{
+ struct server_command_task *sct = container_of(t, struct server_command_task, task);
+ para_fd_set(sct->listen_fd, &s->rfds, &s->max_fileno);
+}
+
+static void command_post_select(struct sched *s, struct task *t)
+{
+ struct server_command_task *sct = container_of(t, struct server_command_task, task);
+
+ int new_fd, ret, i;
+ char *peer_name;
+ pid_t child_pid;
+
+ if (!FD_ISSET(sct->listen_fd, &s->rfds))
+ return;
+ ret = para_accept(sct->listen_fd, NULL, 0);
+ if (ret < 0)
+ goto out;
+ new_fd = ret;
+ peer_name = remote_name(new_fd);
+ PARA_INFO_LOG("got connection from %s, forking\n", peer_name);
+ mmd->num_connects++;
+ mmd->active_connections++;
+ random();
+ child_pid = fork();
+ if (child_pid < 0) {
+ ret = -ERRNO_TO_PARA_ERROR(errno);
+ goto out;
+ }
+ if (child_pid) {
+ close(new_fd);
+ /* parent keeps accepting connections */
+ return;
+ }
+ alarm(ALARM_TIMEOUT);
+ close_listed_fds();
+ para_signal_shutdown();
+ /*
+ * 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]));
+ sprintf(sct->argv[0], "para_server (serving %s)", peer_name);
+ return handle_connect(new_fd, peer_name);
+out:
+ if (ret < 0)
+ PARA_CRIT_LOG("%s\n", para_strerror(-ret));
+}
+
+static void init_server_command_task(int argc, char **argv)
{
- int fd, ret = para_listen(AF_UNSPEC, IPPROTO_TCP, conf.port_arg);
+ int ret;
+ static struct server_command_task server_command_task_struct,
+ *sct = &server_command_task_struct;
+ PARA_NOTICE_LOG("initializing tcp command socket\n");
+ sct->task.pre_select = command_pre_select;
+ sct->task.post_select = command_post_select;
+ sct->argc = argc;
+ sct->argv = argv;
+ ret = para_listen(AF_UNSPEC, IPPROTO_TCP, conf.port_arg);
if (ret < 0)
goto err;
- fd = ret;
- ret = mark_fd_nonblocking(fd);
+ sct->listen_fd = ret;
+ ret = mark_fd_nonblocking(sct->listen_fd);
if (ret < 0)
goto err;
- add_close_on_fork_list(fd); /* child doesn't need the listener */
- return fd;
+ add_close_on_fork_list(sct->listen_fd); /* child doesn't need the listener */
+ register_task(&sct->task);
+ return;
err:
PARA_EMERG_LOG("%s\n", para_strerror(-ret));
exit(EXIT_FAILURE);
exit(EXIT_FAILURE);
}
-uint32_t afs_socket_cookie;
-int afs_socket;
-static pid_t afs_pid;
-
-static void init_afs(void)
+static int init_afs(void)
{
int ret, afs_server_socket[2];
if (ret < 0)
exit(EXIT_FAILURE);
afs_socket_cookie = para_random((uint32_t)-1);
- afs_pid = fork();
- if (afs_pid < 0)
+ mmd->afs_pid = fork();
+ if (mmd->afs_pid < 0)
exit(EXIT_FAILURE);
- if (!afs_pid) { /* child (afs) */
+ if (!mmd->afs_pid) { /* child (afs) */
close(afs_server_socket[0]);
afs_init(afs_socket_cookie, afs_server_socket[1]);
}
close(afs_server_socket[1]);
- afs_socket = afs_server_socket[0];
- ret = mark_fd_nonblocking(afs_socket);
+ 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 unsigned server_init(int argc, char **argv)
+static void server_init(int argc, char **argv)
{
- /* connector's address information */
- int sockfd;
+ struct server_cmdline_parser_params params = {
+ .override = 0,
+ .initialize = 1,
+ .check_required = 0,
+ .check_ambiguity = 0,
+ .print_errors = 1
+ };
+ int afs_socket;
+ valid_fd_012();
init_random_seed();
/* parse command line options */
- server_cmdline_parser(argc, argv, &conf);
+ server_cmdline_parser_ext(argc, argv, &conf, ¶ms);
HANDLE_VERSION_FLAG("server", conf);
para_drop_privileges(conf.user_arg, conf.group_arg);
/* parse config file, open log and set defaults */
daemon_init();
PARA_NOTICE_LOG("initializing audio format handlers\n");
afh_init();
- PARA_NOTICE_LOG("initializing virtual streaming system\n");
- mmd->server_pid = getpid();
- setup_signal_handling();
PARA_NOTICE_LOG("initializing the audio file selector\n");
- init_afs();
- vss_init();
- mmd_lock();
- /* init network socket */
- PARA_NOTICE_LOG("initializing tcp command socket\n");
- sockfd = init_network();
+ afs_socket = init_afs();
+ init_signal_task();
+ PARA_NOTICE_LOG("initializing virtual streaming system\n");
+ init_vss_task(afs_socket);
+ init_server_command_task(argc, argv);
PARA_NOTICE_LOG("server 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);
}
static void status_refresh(void)
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;
}
}
+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
- *
- * \param argc usual argument count
- * \param argv usual argument vector
+ * 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;
- char *peer_name;
- int i, max_fileno, ret;
- pid_t chld_pid;
- fd_set rfds, wfds;
- struct timeval *timeout;
-
- valid_fd_012();
- sockfd = server_init(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].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].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);
-
- 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;
-
- 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, NULL, 0);
- if (new_fd < 0)
- goto repeat;
- peer_name = remote_name(new_fd);
- PARA_INFO_LOG("got connection from %s, forking\n", peer_name);
- 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;
+ int ret;
+ static struct sched s = {
+ .default_timeout = {
+ .tv_sec = 1,
+ .tv_usec = 0
+ },
+ .select_function = server_select
+ };
+ server_init(argc, argv);
+ mutex_lock(mmd_mutex);
+ ret = schedule(&s);
+ if (ret < 0) {
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
}
- alarm(ALARM_TIMEOUT);
- close_listed_fds();
- para_signal_shutdown();
- /*
- * put info on who we are serving into argv[0] to make
- * client ip visible in top/ps
- */
- for (i = argc - 1; i >= 0; i--)
- memset(argv[i], 0, strlen(argv[i]));
- sprintf(argv[0], "para_server (serving %s)", peer_name);
- return handle_connect(new_fd, peer_name);
+ exit(EXIT_SUCCESS);
}
projects / paraslash.git / blobdiff