2 * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file send_common.c Functions used by more than one paraslash sender. */
21 #include "close_on_fork.h"
22 #include "chunk_queue.h"
25 /** Clients will be kicked if there are more than that many bytes pending. */
26 #define MAX_CQ_BYTES 40000
29 * Open a passive socket of given layer4 type.
31 * Set the resultig file descriptor to nonblocking mode and add it to the list
32 * of fds that are being closed in the child process when the server calls
35 * \param l4type The transport-layer protocol.
36 * \param port The port number.
38 * \return The listening fd on success, negative on errors.
40 static int open_sender(unsigned l4type, int port)
42 int fd, ret = para_listen(AF_UNSPEC, l4type, port);
47 ret = mark_fd_nonblocking(fd);
52 add_close_on_fork_list(fd);
57 * Shut down a connected client.
59 * \param sc The client to be shut down.
61 * Close the file descriptor given by \a sc, remove it from the close-on-fork
62 * list, destroy the chunk queue of this client, delete the client from the
63 * list of connected clients and free the sender_client struct.
65 void shutdown_client(struct sender_client *sc, struct sender_status *ss)
67 PARA_INFO_LOG("shutting down %s on fd %d\n", sc->name, sc->fd);
70 del_close_on_fork_list(sc->fd);
73 free(sc->private_data);
78 void shutdown_clients(struct sender_status *ss)
80 struct sender_client *sc, *tmp;
81 list_for_each_entry_safe(sc, tmp, &ss->client_list, node)
82 shutdown_client(sc, ss);
86 * Write a buffer to a non-blocking file descriptor.
88 * \param fd The file descriptor.
89 * \param buf the buffer to write.
90 * \param len the number of bytes of \a buf.
91 * \param max_bytes_per_write Do not write more than that many bytes at once.
93 * If \a max_bytes_per_write is non-zero, do not send more than that many bytes
96 * EAGAIN is not considered an error condition. For example CCID3 has a
97 * sending wait queue which fills up and is emptied asynchronously. The EAGAIN
98 * case means that there is currently no space in the wait queue, but this can
99 * change at any moment.
101 * \return Negative on errors, number of bytes written else.
103 static int write_nonblock(int fd, const char *buf, size_t len,
104 size_t max_bytes_per_write)
109 while (written < len) {
110 size_t num = len - written;
112 if (max_bytes_per_write && max_bytes_per_write < num)
113 num = max_bytes_per_write;
114 ret = write(fd, buf + written, num);
115 if (ret < 0 && errno == EAGAIN)
118 return -ERRNO_TO_PARA_ERROR(errno);
124 static int queue_chunk_or_shutdown(struct sender_client *sc,
125 struct sender_status *ss, long unsigned chunk_num,
128 int ret = cq_enqueue(sc->cq, chunk_num, sent);
130 shutdown_client(sc, ss);
134 /* return: negative on errors, zero if not everything was sent, one otherwise */
135 static int send_queued_chunks(struct sender_client *sc,
136 size_t max_bytes_per_write)
138 struct queued_chunk *qc;
139 while ((qc = cq_peek(sc->cq))) {
143 cq_get(qc, &buf, &len);
144 ret = write_nonblock(sc->fd, buf, len, max_bytes_per_write);
147 cq_update(sc->cq, ret);
156 * Send one chunk of audio data to a connected client.
158 * \param sc The client.
159 * \param max_bytes_per_write Split writes to chunks of at most that many bytes.
160 * \param current_chunk The number of the chunk to write.
161 * \param buf The data to write.
162 * \param len The number of bytes of \a buf.
164 * On errors, the client is shut down. If only a part of the buffer could be
165 * written, the remainder is put into the chunk queue for that client.
167 void send_chunk(struct sender_client *sc, struct sender_status *ss,
168 size_t max_bytes_per_write, long unsigned current_chunk,
169 const char *buf, size_t len)
173 if (!sc->header_sent && current_chunk) {
175 char *header_buf = vss_get_header(&header_len);
176 if (header_buf && header_len > 0) {
177 ret = queue_chunk_or_shutdown(sc, ss, -1U, 0);
183 ret = send_queued_chunks(sc, max_bytes_per_write);
185 shutdown_client(sc, ss);
190 if (!ret) { /* still data left in the queue */
191 ret = queue_chunk_or_shutdown(sc, ss, current_chunk, 0);
194 ret = write_nonblock(sc->fd, buf, len, max_bytes_per_write);
196 shutdown_client(sc, ss);
200 ret = queue_chunk_or_shutdown(sc, ss, current_chunk, ret);
203 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
206 void init_sender_status(struct sender_status *ss, char **access_arg,
207 int num_access_args, int port, int max_clients, int default_deny)
210 INIT_LIST_HEAD(&ss->client_list);
212 acl_init(&ss->acl, access_arg, num_access_args);
214 ss->max_clients = max_clients;
215 ss->default_deny = default_deny;
218 char *get_sender_info(struct sender_status *ss, char *name)
220 char *clnts = NULL, *ret;
221 struct sender_client *sc, *tmp_sc;
223 char *acl_contents = acl_get_contents(&ss->acl);
224 list_for_each_entry_safe(sc, tmp_sc, &ss->client_list, node) {
225 char *tmp = make_message("%s%s ", clnts? clnts : "", sc->name);
233 "\tnumber of connected clients: %d\n"
234 "\tmaximal number of clients: %d%s\n"
235 "\tconnected clients: %s\n"
236 "\taccess %s list: %s\n",
238 (ss->listen_fd >= 0)? "on" : "off",
242 ss->max_clients > 0? "" : " (unlimited)",
243 clnts? clnts : "(none)",
244 ss->default_deny? "allow" : "deny",
245 acl_contents? acl_contents : "(empty)"
252 void generic_com_allow(struct sender_command_data *scd,
253 struct sender_status *ss)
255 acl_allow(scd->addr, scd->netmask, &ss->acl, ss->default_deny);
258 void generic_com_deny(struct sender_command_data *scd,
259 struct sender_status *ss)
261 acl_deny(scd->addr, scd->netmask, &ss->acl, ss->default_deny);
264 int generic_com_on(struct sender_status *ss, unsigned protocol)
268 if (ss->listen_fd >= 0)
270 ret = open_sender(protocol, ss->port);
277 void generic_com_off(struct sender_status *ss)
279 if (ss->listen_fd < 0)
281 PARA_NOTICE_LOG("closing port %d\n", ss->port);
282 close(ss->listen_fd);
283 del_close_on_fork_list(ss->listen_fd);
284 shutdown_clients(ss);
288 struct sender_client *accept_sender_client(struct sender_status *ss)
290 struct sender_client *sc;
291 int fd, ret = para_accept(ss->listen_fd, NULL, 0);
293 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
297 ret = -E_MAX_CLIENTS;
298 if (ss->max_clients > 0 && ss->num_clients >= ss->max_clients)
300 ret = mark_fd_nonblocking(fd);
303 ret = acl_check_access(fd, &ss->acl, ss->default_deny);
307 sc = para_calloc(sizeof(*sc));
309 sc->name = make_message("%s", remote_name(fd));
310 sc->cq = cq_new(MAX_CQ_BYTES);
311 para_list_add(&sc->node, &ss->client_list);
312 add_close_on_fork_list(fd);
313 PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", ss->num_clients,
317 PARA_WARNING_LOG("%s\n", para_strerror(-ret));
322 char *generic_sender_help(void)
326 "usage: {allow|deny} IP mask\n"
327 "example: allow 127.0.0.1 32\n"