X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=server.c;h=d98009d0097f25540174e1a79f194dada46093e4;hp=a048cfda9b9cf3c31cf0715b3b909c4eee5ec71c;hb=d4603bf234d23adb56b208efb90ce66772c4ef5b;hpb=0c5e3f4c2f95d6a73bf840bc82dd0a1ce91e4016 diff --git a/server.c b/server.c index a048cfda..d98009d0 100644 --- a/server.c +++ b/server.c @@ -1,27 +1,20 @@ -/* - * Copyright (C) 1997 Andre Noll - * - * Licensed under the GPL v2. For licencing details see COPYING. - */ +/* Copyright (C) 1997 Andre Noll , see file COPYING. */ /** \file server.c Paraslash's main server. */ /** - * \mainpage Main data structures: + * \mainpage Main data structures and selected APIs: * - * - Server: \ref server_command, \ref sender, + * - 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. - * - * Selected APIs: - * * - 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, + * - Error subsystem: \ref error.h, * - Inter process communication: \ref ipc.h, * - Forward error correction: \ref fec.h, * - Daemons: \ref daemon.h, @@ -29,7 +22,7 @@ * - Interactive sessions: \ref interactive.h, * - File descriptors: \ref fd.h, * - Signals: \ref signal.h, - * - Networking: \ref net.h, + * - Networking: \ref net.h, * - Time: \ref time.c, * - Doubly linked lists: \ref list.h. */ @@ -43,14 +36,17 @@ #include #include #include +#include +#include "server.lsg.h" #include "para.h" #include "error.h" +#include "lsu.h" #include "crypt.h" -#include "server.cmdline.h" #include "afh.h" #include "string.h" #include "afs.h" +#include "net.h" #include "server.h" #include "list.h" #include "send.h" @@ -58,48 +54,58 @@ #include "vss.h" #include "config.h" #include "close_on_fork.h" -#include "net.h" #include "daemon.h" #include "ipc.h" #include "fd.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; +/** Array of error strings. */ +DEFINE_PARA_ERRLIST; -/** Define the array of error lists needed by para_server. */ -INIT_SERVER_ERRLISTS; +__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; +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; -/** A random value used in child context for authentication. */ +/** + * 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; -/** The file containing user information (public key, permissions). */ -static char *user_list_file = NULL; - 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 task responsible for server command handling. */ struct server_command_task { @@ -164,67 +170,59 @@ err_out: /** * (Re-)read the server configuration files. * - * \param override Passed to gengetopt to activate the override feature. + * \param reload Whether config file overrides command line. * - * This function also re-opens the logfile and sets the global \a - * user_list_file variable. + * This function also re-opens the logfile and the user list. On SIGHUP it is + * called from both server and afs context. */ -void parse_config_or_die(int override) +void parse_config_or_die(bool reload) { - char *home = para_homedir(); int ret; - char *cf; - - daemon_close_log(); - if (conf.config_file_given) - cf = para_strdup(conf.config_file_arg); - 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 = file_exists(cf); - if (conf.config_file_given && !ret) { - ret = -1; - PARA_EMERG_LOG("can not read config file %s\n", cf); - goto out; - } - if (ret) { - int tmp = conf.daemon_given; - struct server_cmdline_parser_params params = { - .override = override, - .initialize = 0, - .check_required = 1, - .check_ambiguity = 0, - .print_errors = !conf.daemon_given - }; - server_cmdline_parser_config_file(cf, &conf, ¶ms); - daemon_set_loglevel(conf.loglevel_arg); - conf.daemon_given = tmp; + unsigned flags = MCF_DONT_FREE; + + if (server_lpr != cmdline_lpr) + lls_free_parse_result(server_lpr, CMD_PTR); + server_lpr = cmdline_lpr; + if (reload) + flags |= MCF_OVERRIDE; + ret = lsu_merge_config_file_options(OPT_STRING_VAL(CONFIG_FILE), + "server.conf", &server_lpr, CMD_PTR, server_suite, flags); + if (ret < 0) { + PARA_EMERG_LOG("failed to parse config file: %s\n", + para_strerror(-ret)); + exit(EXIT_FAILURE); } - if (conf.logfile_given) { - daemon_set_logfile(conf.logfile_arg); + daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL)); + if (OPT_GIVEN(LOGFILE)) { + daemon_set_logfile(OPT_STRING_VAL(LOGFILE)); daemon_open_log_or_die(); } - - daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no, - conf.logfile_given, conf.log_color_arg, conf.log_color_given); + 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))); + } daemon_set_flag(DF_LOG_PID); daemon_set_flag(DF_LOG_LL); daemon_set_flag(DF_LOG_TIME); - if (conf.log_timing_given) + if (OPT_GIVEN(LOG_TIMING)) daemon_set_flag(DF_LOG_TIMING); - ret = 1; -out: - free(cf); - free(home); - if (ret > 0) - return; - free(user_list_file); - user_list_file = NULL; - exit(EXIT_FAILURE); + daemon_set_priority(OPT_UINT32_VAL(PRIORITY)); + if (!reload || getpid() != afs_pid) { + char *user_list_file; + if (OPT_GIVEN(USER_LIST)) + user_list_file = para_strdup(OPT_STRING_VAL(USER_LIST)); + else { + char *home = para_homedir(); + user_list_file = make_message("%s/.paraslash/server.users", home); + free(home); + } + init_user_list(user_list_file); + free(user_list_file); + } + return; } /* @@ -232,11 +230,11 @@ out: */ static void handle_sighup(void) { + PARA_NOTICE_LOG("SIGHUP\n"); - parse_config_or_die(1); /* reopens log */ - init_user_list(user_list_file); /* reload user list */ - if (mmd->afs_pid) - kill(mmd->afs_pid, SIGHUP); + parse_config_or_die(true); + if (afs_pid != 0) + kill(afs_pid, SIGHUP); } static int signal_post_select(struct sched *s, __a_unused void *context) @@ -255,7 +253,7 @@ static int signal_post_select(struct sched *s, __a_unused void *context) int ret = para_reap_child(&pid); if (ret <= 0) break; - if (pid != mmd->afs_pid) + if (pid != afs_pid) continue; PARA_EMERG_LOG("fatal: afs died\n"); kill(0, SIGTERM); @@ -281,8 +279,8 @@ static int signal_post_select(struct sched *s, __a_unused void *context) * processes get killed immediately by the above kill(). */ PARA_INFO_LOG("waiting for afs (pid %d) to die\n", - (int)mmd->afs_pid); - waitpid(mmd->afs_pid, NULL, 0); + (int)afs_pid); + waitpid(afs_pid, NULL, 0); cleanup: free(mmd->afd.afhi.chunk_table); close_listed_fds(); @@ -295,22 +293,18 @@ cleanup: static void init_signal_task(void) { - static struct signal_task signal_task_struct, - *st = &signal_task_struct; - - PARA_NOTICE_LOG("setting up signal handling\n"); - st->fd = para_signal_init(); /* always successful */ + 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(st->fd); - st->task = task_register(&(struct task_info) { + 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 = st, + .context = signal_task, }, &sched); } @@ -333,8 +327,6 @@ static int command_post_select(struct sched *s, void *context) ret = para_accept(sct->listen_fd, &s->rfds, NULL, 0, &new_fd); if (ret <= 0) goto out; - peer_name = remote_name(new_fd); - PARA_INFO_LOG("got connection from %s, forking\n", peer_name); mmd->num_connects++; mmd->active_connections++; /* @@ -360,19 +352,22 @@ static int command_post_select(struct sched *s, void *context) /* 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); alarm(ALARM_TIMEOUT); close_listed_fds(); - para_signal_shutdown(); + signal_shutdown(signal_task); /* * 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); - handle_connect(new_fd, peer_name); + i = sct->argc - 1 - lls_num_inputs(cmdline_lpr); + sprintf(sct->argv[i], "para_server (serving %s)", peer_name); + handle_connect(new_fd); /* never reached*/ out: if (ret < 0) @@ -389,7 +384,7 @@ static void init_server_command_task(int argc, char **argv) PARA_NOTICE_LOG("initializing tcp command socket\n"); sct->argc = argc; sct->argv = argv; - ret = para_listen_simple(IPPROTO_TCP, conf.port_arg); + ret = para_listen_simple(IPPROTO_TCP, OPT_UINT32_VAL(PORT)); if (ret < 0) goto err; sct->listen_fd = ret; @@ -412,9 +407,9 @@ err: static int init_afs(int argc, char **argv) { int ret, afs_server_socket[2]; - pid_t afs_pid; + 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); get_random_bytes_or_die((unsigned char *)&afs_socket_cookie, @@ -424,14 +419,20 @@ static int init_afs(int argc, char **argv) exit(EXIT_FAILURE); if (afs_pid == 0) { /* child (afs) */ int i; + + afs_pid = getpid(); for (i = argc - 1; i >= 0; i--) memset(argv[i], 0, strlen(argv[i])); - sprintf(argv[0], "para_server (afs)"); + 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]); } - mmd->afs_pid = afs_pid; close(afs_server_socket[1]); + 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); @@ -441,44 +442,46 @@ static int init_afs(int argc, char **argv) return afs_server_socket[0]; } -__noreturn static void print_help_and_die(void) +static void handle_help_flags(void) { - struct ggo_help h = DEFINE_GGO_HELP(server); - bool d = conf.detailed_help_given; + char *help; + bool d = OPT_GIVEN(DETAILED_HELP); - ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS); - exit(0); + 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 void server_init(int argc, char **argv) { - struct server_cmdline_parser_params params = { - .override = 0, - .initialize = 1, - .check_required = 0, - .check_ambiguity = 0, - .print_errors = 1 - }; - int afs_socket; + int ret, afs_socket, daemon_pipe = -1; + char *errctx; valid_fd_012(); - init_random_seed_or_die(); /* parse command line options */ - server_cmdline_parser_ext(argc, argv, &conf, ¶ms); - 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); - daemon_log_welcome("para_server"); + 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 (OPT_GIVEN(DAEMON)) + daemon_pipe = daemonize(true /* parent waits for SIGTERM */); + init_random_seed_or_die(); + daemon_log_welcome("server"); init_ipc_or_die(); /* init mmd struct and mmd->lock */ daemon_set_start_time(); - init_user_list(user_list_file); - /* become daemon */ - if (conf.daemon_given) - daemonize(true /* parent waits for SIGTERM */); PARA_NOTICE_LOG("initializing audio format handlers\n"); afh_init(); @@ -486,27 +489,37 @@ static void server_init(int argc, char **argv) * 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 -- only the - * good die young. - */ - para_sigaction(SIGUSR1, SIG_IGN); - /* - * We have to block SIGCHLD before the afs process is being forked off. - * Otherwise, para_server does not notice if afs dies before the + * 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"); - init_vss_task(afs_socket, &sched); + vss_init(afs_socket, &sched); init_server_command_task(argc, argv); - if (conf.daemon_given) - kill(getppid(), SIGTERM); + 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) @@ -527,7 +540,7 @@ out: prev_uptime = uptime; prev_events = mmd->events; mmd->vss_status_flags = mmd->new_vss_status_flags; - PARA_DEBUG_LOG("%d events, forcing status update\n", mmd->events); + PARA_DEBUG_LOG("%u events, forcing status update\n", mmd->events); killpg(0, SIGUSR1); } @@ -562,9 +575,10 @@ int main(int argc, char *argv[]) mutex_lock(mmd_mutex); ret = schedule(&sched); sched_shutdown(&sched); - if (ret < 0) { + lls_free_parse_result(server_lpr, CMD_PTR); + if (server_lpr != cmdline_lpr) + lls_free_parse_result(cmdline_lpr, CMD_PTR); + if (ret < 0) PARA_EMERG_LOG("%s\n", para_strerror(-ret)); - exit(EXIT_FAILURE); - } - exit(EXIT_SUCCESS); + exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS); }