X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=server.c;h=b5063e2dfc2a7bd66c9b25836438e6c4677167c7;hp=142e2abb4c982457e2b51b250207e4eedeb77605;hb=47a9983cc65ef57ad25c4ba3e16cabe48fd57b23;hpb=7bf235513ca87b608bdddf6220e284213965e130 diff --git a/server.c b/server.c index 142e2abb..b5063e2d 100644 --- a/server.c +++ b/server.c @@ -1,73 +1,48 @@ /* - * Copyright (C) 1997-2011 Andre Noll + * Copyright (C) 1997-2014 Andre Noll * * Licensed under the GPL v2. For licencing details see COPYING. */ /** \file server.c Paraslash's main server. */ - /** - * \mainpage Paraslash API Reference - * - * Starting points for getting an overview: + * \mainpage Main data structures: * - * - * - The main programs: \ref server.c, \ref audiod.c, \ref client.c, - * \ref audioc.c, \ref afh.c * - Server: \ref server_command, \ref sender, - * - Audio file selector: \ref audio_format_handler, \ref afs_table, - * - Client: \ref receiver, \ref receiver_node, \ref filter, \ref filter_node. - * + * - 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. * - * The gory details, listed by topic: + * Selected APIs: * - * - Audio format handlers: \ref send_common.c \ref mp3_afh.c, - * \ref ogg_afh.c, \ref aac_afh.c, \ref wma_afh.c, \ref spx_afh.c - * - Decoders: \ref mp3dec_filter.c, \ref oggdec_filter.c, - * \ref aacdec_filter.c, \ref wmadec_filter.c, spxdec_filter.c, - * - Volume normalizer: \ref compress_filter.c, - * - Output: \ref alsa_write.c, \ref osx_write.c, \ref oss_write.c, - * - http: \ref http_recv.c, \ref http_send.c, - * - udp: \ref udp_recv.c, \ref udp_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 afh_info, - * - Afs tables: \ref aft.c, \ref mood.c, \ref playlist.c, - * \ref attribute.c, \ref score.c, - * - The virtual streaming system: \ref vss.c, \ref chunk_queue.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, \ref string.h, + * - 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, \ref error2.c, + * - 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, - * - Spawning processes: \ref exec.c, - * - Inter process communication: \ref ipc.c, - * - Blob tables: \ref blob.c, - * - The error subssystem: \ref error.h. - * - Access control for paraslash senders: \ref acl.c, \ref acl.h. - * - Internal crypto API: \ref crypt.h. - * - * Low-level data structures: - * - * - Doubly linked lists: \ref list.h, - * - Ring buffer: \ref ringbuffer.c, \ref ringbuffer.h, - * - openssl: \ref crypt.c - * - libgcrypt: \ref gcrypt.c - * - Forward error correction: \ref fec.c. + * - Doubly linked lists: \ref list.h. */ +#include +#include #include -#include #include #include -#include +#include +#include +#include +#include #include "para.h" #include "error.h" @@ -79,6 +54,7 @@ #include "server.h" #include "list.h" #include "send.h" +#include "sched.h" #include "vss.h" #include "config.h" #include "close_on_fork.h" @@ -86,12 +62,14 @@ #include "daemon.h" #include "ipc.h" #include "fd.h" -#include "sched.h" #include "signal.h" #include "user_list.h" #include "color.h" +#include "ggo.h" #include "version.h" +__printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log; + /** Define the array of error lists needed by para_server. */ INIT_SERVER_ERRLISTS; @@ -121,6 +99,7 @@ int mmd_mutex; /** The file containing user information (public key, permissions). */ static char *user_list_file = NULL; +static struct sched sched; /** The task responsible for server command handling. */ struct server_command_task { @@ -131,7 +110,7 @@ struct server_command_task { /** Argument vector passed to para_server's main function. */ char **argv; /** The command task structure for scheduling. */ - struct task task; + struct task *task; }; static int want_colors(void) @@ -232,13 +211,13 @@ void parse_config_or_die(int override) .print_errors = !conf.daemon_given }; server_cmdline_parser_config_file(cf, &conf, ¶ms); + daemon_set_loglevel(conf.loglevel_arg); conf.daemon_given = tmp; } if (conf.logfile_given) { daemon_set_logfile(conf.logfile_arg); daemon_open_log_or_die(); } - daemon_set_loglevel(conf.loglevel_arg); init_colors_or_die(); daemon_set_flag(DF_LOG_PID); daemon_set_flag(DF_LOG_LL); @@ -256,9 +235,9 @@ out: exit(EXIT_FAILURE); } -static void signal_pre_select(struct sched *s, struct task *t) +static void signal_pre_select(struct sched *s, void *context) { - struct signal_task *st = container_of(t, struct signal_task, task); + struct signal_task *st = context; para_fd_set(st->fd, &s->rfds, &s->max_fileno); } @@ -274,13 +253,13 @@ static void handle_sighup(void) kill(mmd->afs_pid, SIGHUP); } -static void signal_post_select(struct sched *s, __a_unused struct task *t) +static int signal_post_select(struct sched *s, __a_unused void *context) { int signum = para_next_signal(&s->rfds); switch (signum) { case 0: - return; + return 0; case SIGHUP: handle_sighup(); break; @@ -325,6 +304,7 @@ cleanup: shm_detach(mmd); exit(EXIT_FAILURE); } + return 0; } static void init_signal_task(void) @@ -332,10 +312,6 @@ static void init_signal_task(void) 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"); - PARA_NOTICE_LOG("setting up signal handling\n"); st->fd = para_signal_init(); /* always successful */ para_install_sighandler(SIGINT); @@ -344,18 +320,24 @@ static void init_signal_task(void) para_install_sighandler(SIGCHLD); para_sigaction(SIGPIPE, SIG_IGN); add_close_on_fork_list(st->fd); - register_task(&st->task); + st->task = task_register(&(struct task_info) { + .name = "signal", + .pre_select = signal_pre_select, + .post_select = signal_post_select, + .context = st, + + }, &sched); } -static void command_pre_select(struct sched *s, struct task *t) +static void command_pre_select(struct sched *s, void *context) { - struct server_command_task *sct = container_of(t, struct server_command_task, task); + struct server_command_task *sct = context; para_fd_set(sct->listen_fd, &s->rfds, &s->max_fileno); } -static void command_post_select(struct sched *s, struct task *t) +static int command_post_select(struct sched *s, void *context) { - struct server_command_task *sct = container_of(t, struct server_command_task, task); + struct server_command_task *sct = context; int new_fd, ret, i; char *peer_name; @@ -385,9 +367,12 @@ static void command_post_select(struct sched *s, struct task *t) goto out; } 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; + return 0; } /* mmd might already have changed at this point */ free(chunk_table); @@ -401,10 +386,12 @@ static void command_post_select(struct sched *s, struct task *t) 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); + handle_connect(new_fd, peer_name); + /* never reached*/ out: if (ret < 0) PARA_CRIT_LOG("%s\n", para_strerror(-ret)); + return 0; } static void init_server_command_task(int argc, char **argv) @@ -414,8 +401,6 @@ static void init_server_command_task(int argc, char **argv) *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_simple(IPPROTO_TCP, conf.port_arg); @@ -426,15 +411,19 @@ static void init_server_command_task(int argc, char **argv) if (ret < 0) goto err; add_close_on_fork_list(sct->listen_fd); /* child doesn't need the listener */ - sprintf(sct->task.status, "server command task"); - register_task(&sct->task); + 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(void) +static int init_afs(int argc, char **argv) { int ret, afs_server_socket[2]; pid_t afs_pid; @@ -448,6 +437,10 @@ static int init_afs(void) if (afs_pid < 0) exit(EXIT_FAILURE); if (afs_pid == 0) { /* child (afs) */ + int i; + for (i = argc - 1; i >= 0; i--) + memset(argv[i], 0, strlen(argv[i])); + sprintf(argv[0], "para_server (afs)"); close(afs_server_socket[0]); afs_init(afs_socket_cookie, afs_server_socket[1]); } @@ -462,10 +455,13 @@ static int init_afs(void) return afs_server_socket[0]; } -__noreturn static void tmp_sigchld_handler(__a_unused int s) +__noreturn static void print_help_and_die(void) { - PARA_EMERG_LOG("caught early SIGCHLD\n"); - exit(EXIT_FAILURE); + struct ggo_help h = DEFINE_GGO_HELP(server); + bool d = conf.detailed_help_given; + + ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS); + exit(0); } static void server_init(int argc, char **argv) @@ -483,19 +479,20 @@ static void server_init(int argc, char **argv) init_random_seed_or_die(); /* parse command line options */ server_cmdline_parser_ext(argc, argv, &conf, ¶ms); - HANDLE_VERSION_FLAG("server", conf); - drop_privileges_or_die(conf.user_arg, conf.group_arg); + daemon_set_loglevel(conf.loglevel_arg); + version_handle_flag("server", conf.version_given); + if (conf.help_given || conf.detailed_help_given) + print_help_and_die(); + daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg); /* parse config file, open log and set defaults */ parse_config_or_die(0); - log_welcome("para_server"); + daemon_log_welcome("para_server"); init_ipc_or_die(); /* init mmd struct and mmd->lock */ - /* make sure, the global now pointer is uptodate */ - gettimeofday(now, NULL); - server_uptime(UPTIME_SET); /* reset server uptime */ + daemon_set_start_time(); init_user_list(user_list_file); /* become daemon */ if (conf.daemon_given) - daemonize(); + daemonize(true /* parent waits for SIGTERM */); PARA_NOTICE_LOG("initializing audio format handlers\n"); afh_init(); @@ -508,24 +505,28 @@ static void server_init(int argc, char **argv) */ para_sigaction(SIGUSR1, SIG_IGN); /* - * We have to install a SIGCHLD handler before the afs process is being - * forked off. Otherwise, para_server does not notice if afs dies before - * the SIGCHLD handler has been installed by init_signal_task() below. + * We have to block SIGCHLD before the afs process is being forked off. + * 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(SIGCHLD, tmp_sigchld_handler); + para_block_signal(SIGCHLD); PARA_NOTICE_LOG("initializing the audio file selector\n"); - afs_socket = init_afs(); + afs_socket = init_afs(argc, argv); init_signal_task(); + para_unblock_signal(SIGCHLD); PARA_NOTICE_LOG("initializing virtual streaming system\n"); - init_vss_task(afs_socket); + init_vss_task(afs_socket, &sched); init_server_command_task(argc, argv); + if (conf.daemon_given) + kill(getppid(), SIGTERM); PARA_NOTICE_LOG("server init complete\n"); } 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; @@ -540,11 +541,8 @@ 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("%d events, forcing status update\n", mmd->events); + killpg(0, SIGUSR1); } static int server_select(int max_fileno, fd_set *readfds, fd_set *writefds, @@ -570,16 +568,14 @@ static int server_select(int max_fileno, fd_set *readfds, fd_set *writefds, int main(int argc, char *argv[]) { int ret; - static struct sched s = { - .default_timeout = { - .tv_sec = 1, - .tv_usec = 0 - }, - .select_function = server_select - }; + + sched.default_timeout.tv_sec = 1; + sched.select_function = server_select; + server_init(argc, argv); mutex_lock(mmd_mutex); - ret = schedule(&s); + ret = schedule(&sched); + sched_shutdown(&sched); if (ret < 0) { PARA_EMERG_LOG("%s\n", para_strerror(-ret)); exit(EXIT_FAILURE);