X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=server.c;h=915687649f7f84c8a572b2257a7439498d31c873;hp=611b61f74d8724e115371d7c67d2d6692be4aa13;hb=cec9a9348c155e285eb94f024b263d52e1735301;hpb=ad8cddca626bb37daefa845134258574c55ad90e diff --git a/server.c b/server.c index 611b61f7..91568764 100644 --- a/server.c +++ b/server.c @@ -10,12 +10,11 @@ /** * \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. @@ -23,7 +22,7 @@ * * The gory details, listed by topic: * - * - Audio format handlers: \ref mp3_afh.c, \ref ogg_afh.c, \ref aac_afh.c, + * - Audio format handlers: \ref send_common.c \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, * - Output: \ref alsa_write.c, \ref osx_write.c, @@ -64,7 +63,6 @@ */ #include -#include #include #include "para.h" @@ -87,10 +85,10 @@ #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 /** @@ -100,52 +98,43 @@ INIT_SERVER_ERRLISTS; 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,...) { @@ -208,27 +197,6 @@ err_out: 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(); @@ -276,9 +244,74 @@ out: 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) @@ -293,25 +326,86 @@ static void setup_signal_handling(void) 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); @@ -346,11 +440,7 @@ err: 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]; @@ -358,27 +448,25 @@ static void init_afs(void) 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, @@ -386,6 +474,9 @@ static unsigned server_init(int argc, char **argv) .check_ambiguity = 0, .print_errors = 1 }; + int afs_socket; + + valid_fd_012(); init_random_seed(); /* parse command line options */ server_cmdline_parser_ext(argc, argv, &conf, ¶ms); @@ -402,32 +493,13 @@ static unsigned server_init(int argc, char **argv) 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("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) @@ -438,10 +510,12 @@ 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; @@ -453,105 +527,42 @@ out: } } +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(); - mmd_unlock(); - ret = para_select(max_fileno + 1, &rfds, &wfds, timeout); - mmd_lock(); - if (ret < 0) - goto repeat; - vss_post_select(&rfds, &wfds); - 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 (!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("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); }