X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=server.c;h=d8fc48eeb0f7b220e49832ccb9e1e5706c63fde0;hp=20efdce4e233c4a1f67a50c83a12b5b02cd9a94c;hb=b3ee0fa979a74e9d7a1497ec5a3ac8fa7cc7472b;hpb=6e1de6469d0595740fd8350f435b0562d23d87fa diff --git a/server.c b/server.c index 20efdce4..d8fc48ee 100644 --- a/server.c +++ b/server.c @@ -1,48 +1,90 @@ /* - * Copyright (C) 1997-2006 Andre Noll + * Copyright (C) 1997-2007 Andre Noll * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. + * Licensed under the GPL v2. For licencing details see COPYING. */ -/** \file server.c Paraslash's main server */ +/** \file server.c Paraslash's main server. */ -/** \mainpage Paraslash API Reference +/** + * \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. + * * - * Good starting points for reading are probably \ref audio_file_selector, - * \ref sender, \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, + * - 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, + * - Time: \ref time.c, + * - Spawning processes: \ref exec.c, + * - Inter process communication: \ref ipc.c, + * - The object storage layer: \ref osl.c, + * - Blob tables: \ref blob.c, + * - The error subssystem: \ref error.h. + * + * Low-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. * */ +#include +#include +#include - +#include "para.h" +#include "error.h" #include "server.cmdline.h" -#include "db.h" -#include "server.h" +#include "afh.h" +#include "string.h" #include "afs.h" +#include "server.h" +#include "vss.h" #include "config.h" #include "close_on_fork.h" #include "send.h" -#include "error.h" #include "net.h" #include "daemon.h" -#include "string.h" #include "ipc.h" #include "fd.h" -#include "crypt.h" +#include "list.h" +#include "sched.h" +#include "signal.h" +#include "user_list.h" /** define the array of error lists needed by para_server */ INIT_SERVER_ERRLISTS; @@ -50,49 +92,27 @@ INIT_SERVER_ERRLISTS; /** shut down non-authorized connections after that many seconds */ #define ALARM_TIMEOUT 10 -/* these are exported to afs.c. command.c and to all selectors */ +/** + * Pointer to shared memory area for communication between para_server + * and its children. Exported to vss.c. command.c and to afs. + */ struct misc_meta_data *mmd; -/** the configuration of para_server + +/** + * the configuration of para_server * - * It also contains the options for all audio file selectors and all supported - * senders. -*/ + * 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; -struct list_head user_list; + extern void dccp_send_init(struct sender *); extern void http_send_init(struct sender *); extern void ortp_send_init(struct sender *); -/* TODO: This is better handled by autoconf */ -/** the list of supported audio file selectors */ -struct audio_file_selector selectors[] = { - { - .name = "random", - .init = random_selector_init, - .update_audio_file = NULL, - }, - { - .name = "playlist", - .init = playlist_selector_init, - .update_audio_file = NULL, - .pre_select = NULL, - .post_select = NULL, - }, -#ifdef HAVE_MYSQL - { - .name = "mysql", - .init = mysql_selector_init, - .update_audio_file = NULL, - .pre_select = NULL, - .post_select = NULL, - }, -#endif - { - .name = NULL, - } -}; - /** the list of supported senders */ struct sender senders[] = { { @@ -174,16 +194,14 @@ static void shm_init(void) goto err_out; mmd_mutex = ret; - mmd->selector_num = 0; mmd->num_played = 0; mmd->num_commands = 0; mmd->events = 0; mmd->num_connects = 0; mmd->active_connections = 0; - strcpy(mmd->filename, "(none)"); - mmd->audio_format = -1; - mmd->afs_status_flags = AFS_NEXT; - mmd->new_afs_status_flags = AFS_NEXT; + 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; err_out: @@ -194,7 +212,7 @@ err_out: /** * lock the shared memory area containing the mmd struct * - * \sa semop(2), struct misc_meta_data + * \sa semop(2), struct misc_meta_data. */ void mmd_lock(void) { @@ -220,7 +238,7 @@ static void parse_config(int override) char *cf; if (conf.config_file_given) - cf = conf.config_file_arg; + cf = para_strdup(conf.config_file_arg); else cf = make_message("%s/.paraslash/server.conf", home); free(user_list_file); @@ -236,7 +254,13 @@ static void parse_config(int override) } if (!ret) { int tmp = conf.daemon_given; - server_cmdline_parser_configfile(cf, &conf, override, 0, 0); + 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; } /* logfile */ @@ -276,136 +300,6 @@ static void setup_signal_handling(void) } } -/* - * lookup user in user list file. Fills in a user struct containing - * filename of the user's public key as well as the permissions of that user. - * Returns 1 on success, 0 if user does not exist and < 0 on errors. - */ -static void populate_user_list(void) { - FILE *file_ptr = NULL; - char *char_ptr; - char line[MAXLINE]; - /* keyword, user, key, perms */ - char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE]; - int num, ret; - - file_ptr = fopen(user_list_file, "r"); - ret = -E_USERLIST; - if (!file_ptr) - goto out; - for (;;) { - struct user *u; - ret = para_fgets(line, MAXLINE, file_ptr); - if (ret < 0) - PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret)); - if (ret <= 0) - break; - if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3) - continue; - if (strcmp(w, "user")) - continue; - PARA_DEBUG_LOG("found entry for %s\n", n); - u = para_malloc(sizeof(struct user)); - u->name = para_strdup(n); - u->rsa = para_malloc(sizeof(RSA)); - ret = get_rsa_key(k, &u->rsa, 0 /* public */); - if (ret < 0) - break; - u->perms = 0; - char_ptr = p; - num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]", - tmp[0], tmp[1], tmp[2], tmp[3]); - PARA_DEBUG_LOG("found %i perm entries\n", num); - u->perms = 0; - while (num > 0) { - num--; - if (!strcmp(tmp[num], "AFS_READ")) - u->perms |= AFS_READ; - else if (!strcmp(tmp[num], "AFS_WRITE")) - u->perms |= AFS_WRITE; - else if (!strcmp(tmp[num], "DB_READ")) - u->perms |= DB_READ; - else if (!strcmp(tmp[num], "DB_WRITE")) - u->perms |= DB_WRITE; - else /* unknown permission */ - PARA_WARNING_LOG("unknown permission: %s\n", - tmp[num]); - } - para_list_add(&u->node, &user_list); - } -out: - if (file_ptr) - fclose(file_ptr); - if (ret >= 0) - return; - PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret)); - exit(EXIT_FAILURE); -} - -static void init_user_list(void) -{ - struct user *u, *tmp; - static int initialized; - - if (initialized) { - list_for_each_entry_safe(u, tmp, &user_list, node) { - list_del(&u->node); - free(u->name); - free(u->rsa); - free(u); - } - } else - INIT_LIST_HEAD(&user_list); - initialized = 1; - populate_user_list(); -} - -/** - * lookup user in user_list. - * - * \param user: must initially contain the name of the user and is filled - * in by this function on success. - * - * \return 1 on success and < 0 on errors. - */ -int get_user(struct user *user) -{ - struct user *u; - list_for_each_entry(u, &user_list, node) { - if (strcmp(u->name, user->name)) - continue; - *user = *u; - return 1; - } - return -E_BAD_USER; -} - -static void init_selector(void) -{ - int i, ret; - - mmd->selector_change = -1; /* no change nec., set to new num by com_chs */ - if (!conf.selector_given) - goto random; - for (i = 0; selectors[i].name; i++) { - if (strcmp(selectors[i].name, conf.selector_arg)) - continue; - PARA_NOTICE_LOG("initializing %s audio file selector\n", - selectors[i].name); - ret = selectors[i].init(&selectors[i]); - if (ret < 0) { - PARA_WARNING_LOG("%s", PARA_STRERROR(-ret)); - break; - } - mmd->selector_num = i; - return; - } - PARA_WARNING_LOG("%s", "falling back to the random selector\n"); -random: - mmd->selector_num = 0; - selectors[0].init(&selectors[0]); /* always successful */ -} - static unsigned init_network(void) { int fd, ret = init_tcp_socket(conf.port_arg); @@ -424,8 +318,9 @@ err: static void init_random_seed(void) { - int fd, ret = -1, len = sizeof(unsigned int); + int fd, ret = -1; unsigned int seed; + size_t len = sizeof(unsigned int); fd = open("/dev/urandom", O_RDONLY); if (fd < 0) @@ -445,7 +340,37 @@ out: exit(EXIT_FAILURE); } -static unsigned do_inits(int argc, char **argv) +uint32_t afs_socket_cookie; +int afs_socket; +static pid_t afs_pid; + +static void init_afs(void) +{ + int ret, afs_server_socket[2]; + + ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, afs_server_socket); + if (ret < 0) + exit(EXIT_FAILURE); + afs_socket_cookie = para_random((uint32_t)-1); + afs_pid = fork(); + if (afs_pid < 0) + exit(EXIT_FAILURE); + if (!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_nonblock(afs_socket); + 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); +} + + +static unsigned server_init(int argc, char **argv) { /* connector's address information */ int sockfd; @@ -453,47 +378,33 @@ static unsigned do_inits(int argc, char **argv) init_random_seed(); /* 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(); + init_user_list(user_list_file); /* become daemon */ if (conf.daemon_given) daemon_init(); - init_selector(); - PARA_NOTICE_LOG("%s", "initializing audio file sender\n"); - /* audio file sender */ - afs_init(); + PARA_NOTICE_LOG("initializing audio format handlers\n"); + afh_init(); + PARA_NOTICE_LOG("initializing virtual streaming system\n"); + vss_init(); mmd->server_pid = getpid(); setup_signal_handling(); + PARA_NOTICE_LOG("initializing the audio file selector\n"); + init_afs(); mmd_lock(); /* init network socket */ - PARA_NOTICE_LOG("%s", "initializing tcp command socket\n"); + PARA_NOTICE_LOG("initializing tcp command socket\n"); sockfd = init_network(); - PARA_NOTICE_LOG("%s", "init complete\n"); + PARA_NOTICE_LOG("server init complete\n"); return sockfd; } -static void change_selector(void) -{ - int ret, old = mmd->selector_num, new = mmd->selector_change; - - selectors[old].shutdown(); - ret = selectors[new].init(&selectors[new]); - mmd->selector_change = -1; /* reset */ - if (ret >= 0) { - mmd->selector_num = new; - return; - } - /* init failed */ - PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret)); - selectors[0].init(&selectors[0]); - mmd->selector_num = 0; -} - /* * called when server gets SIGHUP or when client invokes hup command. */ @@ -503,8 +414,9 @@ static void handle_sighup(void) close_log(logfile); /* gets reopened if necessary by parse_config */ logfile = NULL; parse_config(1); /* reopens log */ - mmd->selector_change = mmd->selector_num; /* do not change selector.. */ - change_selector(); /* .. just reload */ + init_user_list(user_list_file); /* reload user list */ + if (afs_pid) + kill(afs_pid, SIGHUP); } static void status_refresh(void) @@ -514,7 +426,7 @@ static void status_refresh(void) if (prev_events != mmd->events) goto out; - if (mmd->new_afs_status_flags != mmd->afs_status_flags) + if (mmd->new_vss_status_flags != mmd->vss_status_flags) goto out; if (uptime / 60 != prev_uptime / 60) goto out; @@ -522,16 +434,22 @@ static void status_refresh(void) out: prev_uptime = uptime; prev_events = mmd->events; - mmd->afs_status_flags = mmd->new_afs_status_flags; + mmd->vss_status_flags = mmd->new_vss_status_flags; if (ret) { - PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n", - mmd->events, mmd->audio_format); + PARA_DEBUG_LOG("%d events, forcing status update\n", + mmd->events); killpg(0, SIGUSR1); } } -/* - * MAIN +/** + * the main function of para_server + * + * \param argc usual argument count + * \param argv usual argument vector + * + * \return EXIT_SUCCESS or EXIT_FAILURE + * */ int main(int argc, char *argv[]) { @@ -544,7 +462,7 @@ int main(int argc, char *argv[]) struct timeval *timeout; valid_fd_012(); - sockfd = do_inits(argc, argv); + sockfd = server_init(argc, argv); repeat: FD_ZERO(&rfds); FD_ZERO(&wfds); @@ -552,26 +470,19 @@ repeat: /* check socket and signal pipe in any case */ para_fd_set(sockfd, &rfds, &max_fileno); para_fd_set(signal_pipe, &rfds, &max_fileno); - timeout = afs_preselect(); + 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); - } - if (selectors[mmd->selector_num].pre_select) { - ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds); - max_fileno = PARA_MAX(max_fileno, ret); + senders[i].pre_select(&max_fileno, &rfds, &wfds); } mmd_unlock(); ret = para_select(max_fileno + 1, &rfds, &wfds, timeout); mmd_lock(); - if (mmd->selector_change >= 0) - change_selector(); - if (selectors[mmd->selector_num].post_select) - selectors[mmd->selector_num].post_select(&rfds, &wfds); + vss_post_select(&rfds, &wfds); if (ret < 0) goto repeat; for (i = 0; senders[i].name; i++) { @@ -581,27 +492,37 @@ repeat: continue; senders[i].post_select(&rfds, &wfds); } - afs_send_chunk(); + 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: - para_reap_children(); + 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); - selectors[mmd->selector_num].shutdown(); mutex_destroy(mmd_mutex); shm_detach(mmd); shm_destroy(mmd_shm_id); + exit(EXIT_FAILURE); } }