| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005, 2007-2009, 2012 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file server/state.c |
| 19 | * @brief Global server state |
| 20 | */ |
| 21 | #include "disorder-server.h" |
| 22 | |
| 23 | /** @brief A unix domain socket */ |
| 24 | struct unix_socket { |
| 25 | const char *path; |
| 26 | int fd; |
| 27 | }; |
| 28 | |
| 29 | struct unix_socket main_socket[1], priv_socket[1]; |
| 30 | |
| 31 | /** @brief TCP listener definition */ |
| 32 | struct listener { |
| 33 | /** @brief Next listener */ |
| 34 | struct listener *next; |
| 35 | |
| 36 | /** @brief Local socket address */ |
| 37 | struct sockaddr *sa; |
| 38 | |
| 39 | /** @brief File descriptor */ |
| 40 | int fd; |
| 41 | }; |
| 42 | |
| 43 | /** @brief Current listeners */ |
| 44 | static struct listener *listeners; |
| 45 | |
| 46 | /** @brief Current audio API */ |
| 47 | const struct uaudio *api; |
| 48 | |
| 49 | /** @brief Quit DisOrder */ |
| 50 | void quit(ev_source *ev) { |
| 51 | disorder_info("shutting down..."); |
| 52 | quitting(ev); |
| 53 | trackdb_close(); |
| 54 | trackdb_deinit(ev); |
| 55 | /* Shutdown subprocesses. |
| 56 | * |
| 57 | * Subprocesses that use ev_child: |
| 58 | * - the speaker |
| 59 | * - the current rescan |
| 60 | * - any decoders |
| 61 | * - ...and players |
| 62 | * - the track picker |
| 63 | * - mail sender |
| 64 | * - the deadlock manager |
| 65 | * |
| 66 | * Subprocesses that don't: |
| 67 | * - any normalizers |
| 68 | * These are not shut down currently. |
| 69 | */ |
| 70 | ev_child_killall(ev); |
| 71 | disorder_info("exiting"); |
| 72 | exit(0); |
| 73 | } |
| 74 | |
| 75 | /** @brief Create a copy of an @c addrinfo structure */ |
| 76 | static struct sockaddr *copy_sockaddr(const struct addrinfo *addr) { |
| 77 | struct sockaddr *sa = xmalloc_noptr(addr->ai_addrlen); |
| 78 | memcpy(sa, addr->ai_addr, addr->ai_addrlen); |
| 79 | return sa; |
| 80 | } |
| 81 | |
| 82 | static void reset_unix_socket(ev_source *ev, |
| 83 | struct unix_socket *s, |
| 84 | const char *new_path, |
| 85 | int privileged) { |
| 86 | struct sockaddr_un sun; |
| 87 | if(!s->path || strcmp(s->path, new_path)) { |
| 88 | /* either there was no socket, or there was but a different path */ |
| 89 | if(s->path) { |
| 90 | /* stop the old one and remove it from the filesystem */ |
| 91 | server_stop(ev, s->fd); |
| 92 | if(unlink(s->path) < 0) |
| 93 | disorder_fatal(errno, "unlink %s", s->path); |
| 94 | } |
| 95 | /* start the new one */ |
| 96 | if(strlen(new_path) >= sizeof sun.sun_path) |
| 97 | disorder_fatal(0, "socket path %s is too long", new_path); |
| 98 | memset(&sun, 0, sizeof sun); |
| 99 | sun.sun_family = AF_UNIX; |
| 100 | strcpy(sun.sun_path, new_path); |
| 101 | if(unlink(new_path) < 0 && errno != ENOENT) |
| 102 | disorder_fatal(errno, "unlink %s", new_path); |
| 103 | if((s->fd = server_start(ev, PF_UNIX, sizeof sun, |
| 104 | (const struct sockaddr *)&sun, |
| 105 | new_path, |
| 106 | privileged)) >= 0) { |
| 107 | s->path = new_path; |
| 108 | if(chmod(new_path, 0777) < 0) /* TODO */ |
| 109 | disorder_fatal(errno, "error calling chmod %s", new_path); |
| 110 | } else |
| 111 | s->path = 0; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /** @brief Create and destroy sockets to set current configuration */ |
| 116 | void reset_sockets(ev_source *ev) { |
| 117 | struct addrinfo *res, *r; |
| 118 | struct listener *l, **ll; |
| 119 | const char *private_dir = config_get_file("private"); |
| 120 | |
| 121 | /* create the private socket directory */ |
| 122 | unlink(private_dir); |
| 123 | if(mkdir(private_dir, 0700) < 0 && errno != EEXIST) |
| 124 | disorder_fatal(errno, "error creating %s", private_dir); |
| 125 | |
| 126 | /* unix first */ |
| 127 | reset_unix_socket(ev, main_socket, config_get_file("socket"), 0); |
| 128 | reset_unix_socket(ev, priv_socket, config_get_file("private/socket"), 1); |
| 129 | |
| 130 | /* get the new listen config */ |
| 131 | if(config->listen.af != -1) |
| 132 | res = netaddress_resolve(&config->listen, 1, IPPROTO_TCP); |
| 133 | else |
| 134 | res = 0; |
| 135 | |
| 136 | /* Close any current listeners that aren't required any more */ |
| 137 | ll = &listeners; |
| 138 | while((l = *ll)) { |
| 139 | for(r = res; r; r = r->ai_next) |
| 140 | if(!sockaddrcmp(r->ai_addr, l->sa)) |
| 141 | break; |
| 142 | if(!r) { |
| 143 | /* Didn't find a match, remove this one */ |
| 144 | server_stop(ev, l->fd); |
| 145 | *ll = l->next; |
| 146 | } else { |
| 147 | /* This address is still wanted */ |
| 148 | ll = &l->next; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /* Open any new listeners that are required */ |
| 153 | for(r = res; r; r = r->ai_next) { |
| 154 | for(l = listeners; l; l = l->next) |
| 155 | if(!sockaddrcmp(r->ai_addr, l->sa)) |
| 156 | break; |
| 157 | if(!l) { |
| 158 | /* Didn't find a match, need a new listener */ |
| 159 | int fd = server_start(ev, r->ai_family, r->ai_addrlen, r->ai_addr, |
| 160 | format_sockaddr(r->ai_addr), 0); |
| 161 | if(fd >= 0) { |
| 162 | l = xmalloc(sizeof *l); |
| 163 | l->next = listeners; |
| 164 | l->sa = copy_sockaddr(r); |
| 165 | l->fd = fd; |
| 166 | listeners = l; |
| 167 | } |
| 168 | /* We ignore any failures (though server_start() will have |
| 169 | * logged them). */ |
| 170 | } |
| 171 | } |
| 172 | /* if res is still set it needs freeing */ |
| 173 | if(res) |
| 174 | freeaddrinfo(res); |
| 175 | } |
| 176 | |
| 177 | /** @brief Reconfigure the server |
| 178 | * @param ev Event loop |
| 179 | * @param flags Flags |
| 180 | * @return As config_read(); 0 on success, -1 if could not (re-)read config |
| 181 | */ |
| 182 | int reconfigure(ev_source *ev, unsigned flags) { |
| 183 | int need_another_rescan = 0; |
| 184 | int ret = 0; |
| 185 | |
| 186 | D(("reconfigure(%x)", flags)); |
| 187 | /* Deconfigure the old audio API if there is one */ |
| 188 | if(api) { |
| 189 | if(api->close_mixer) |
| 190 | api->close_mixer(); |
| 191 | api = NULL; |
| 192 | } |
| 193 | if(flags & RECONFIGURE_RELOADING) { |
| 194 | /* If there's a rescan in progress, cancel it but remember to start a fresh |
| 195 | * one after the reload. */ |
| 196 | need_another_rescan = trackdb_rescan_cancel(); |
| 197 | /* (Re-)read the configuration */ |
| 198 | if(config_read(1/*server*/, config)) |
| 199 | ret = -1; |
| 200 | else { |
| 201 | /* Tell the speaker it needs to reload its config too. */ |
| 202 | speaker_reload(); |
| 203 | disorder_info("%s: installed new configuration", configfile); |
| 204 | } |
| 205 | } |
| 206 | /* New audio API */ |
| 207 | api = uaudio_find(config->api); |
| 208 | if(api->configure) |
| 209 | api->configure(); |
| 210 | if(api->open_mixer) |
| 211 | api->open_mixer(); |
| 212 | /* If we interrupted a rescan of all the tracks, start a new one */ |
| 213 | if(need_another_rescan) |
| 214 | trackdb_rescan(ev, 1/*check*/, 0, 0); |
| 215 | if(!ret && !(flags & RECONFIGURE_FIRST)) { |
| 216 | /* Open/close sockets */ |
| 217 | reset_sockets(ev); |
| 218 | } |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | Local Variables: |
| 224 | c-basic-offset:2 |
| 225 | comment-column:40 |
| 226 | fill-column:79 |
| 227 | indent-tabs-mode:nil |
| 228 | End: |
| 229 | */ |