2 * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file dccp_send.c paraslash's dccp sender */
10 * based on server.c of dccp-cs-0.01.tar.bz2,
11 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
23 #include "close_on_fork.h"
24 #include "chunk_queue.h"
25 #include "server.cmdline.h"
27 /** the list of connected clients **/
28 static struct list_head clients;
29 static int listen_fd = -1;
30 static struct sender *self;
32 /** Maximal number of bytes in a chunk queue. */
33 #define DCCP_MAX_PENDING_BYTES 40000
35 /** describes one connected client */
37 /** the dccp socket */
39 /** address information about the client */
40 struct sockaddr_in addr;
41 /** the position of this client in the client list */
42 struct list_head node;
43 /** non-zero if audio file header has been sent */
45 /** The list of pending chunks for this client. */
46 struct chunk_queue *cq;
49 static void dccp_pre_select( int *max_fileno, fd_set *rfds,
50 __a_unused fd_set *wfds)
54 FD_SET(listen_fd, rfds);
55 *max_fileno = PARA_MAX(*max_fileno, listen_fd);
58 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
60 struct dccp_client *dc;
63 if (!FD_ISSET(listen_fd, rfds))
65 dc = para_calloc(sizeof(struct dccp_client));
66 ret = para_accept(listen_fd, &dc->addr, sizeof(struct sockaddr_in));
68 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
71 PARA_NOTICE_LOG("connection from %s\n", inet_ntoa(dc->addr.sin_addr));
73 para_list_add(&dc->node, &clients);
74 add_close_on_fork_list(dc->fd);
75 mark_fd_nonblock(dc->fd);
76 dc->cq = cq_new(DCCP_MAX_PENDING_BYTES);
79 static int dccp_open(void)
81 struct sockaddr_in servaddr;
84 ret = dccp_get_socket();
89 memset(&servaddr, 0, sizeof(servaddr));
90 servaddr.sin_family = AF_INET;
91 servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
92 servaddr.sin_port = htons(conf.dccp_port_arg);
93 ret = bind(listen_fd, (struct sockaddr *)&servaddr, sizeof(servaddr));
96 ret = dccp_set_socket(listen_fd);
99 ret = listen(listen_fd, 0);
101 PARA_ERROR_LOG("%s\n", strerror(errno));
102 return -E_DCCP_LISTEN;
104 PARA_DEBUG_LOG("listening on fd %d\n", listen_fd);
105 add_close_on_fork_list(listen_fd);
106 mark_fd_nonblock(listen_fd);
110 static void dccp_shutdown_client(struct dccp_client *dc)
112 PARA_DEBUG_LOG("shutting down %s (fd %d)\n", inet_ntoa(dc->addr.sin_addr),
115 del_close_on_fork_list(dc->fd);
122 * ret: Negative on errors, zero if nothing was written and write returned
123 * EAGAIN, number of bytes written else.
125 static int dccp_write(int fd, const char *buf, size_t len)
130 while (written < len) {
131 ret = write(fd, buf + written, PARA_MIN(1024, len - written));
133 * Error handling: CCID3 has a sending wait queue which fills up and is
134 * emptied asynchronously. The EAGAIN case means that there is currently
135 * no space in the wait queue, but this can change at any moment and is
136 * thus not an error condition.
138 if (ret < 0 && errno == EAGAIN)
141 PARA_ERROR_LOG("%s\n", strerror(errno));
142 return -E_DCCP_WRITE;
149 static int queue_chunk_or_shutdown(struct dccp_client *dc, long unsigned chunk_num,
152 int ret = cq_enqueue(dc->cq, chunk_num, sent);
154 PARA_NOTICE_LOG("enqueue error\n");
155 dccp_shutdown_client(dc);
160 static int send_queued_chunks(struct dccp_client *dc)
162 struct queued_chunk *qc;
163 while ((qc = cq_peek(dc->cq))) {
167 cq_get(qc, &buf, &len);
168 ret = dccp_write(dc->fd, buf, len);
171 cq_update(dc->cq, ret);
179 static void dccp_send(long unsigned current_chunk,
180 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
182 struct dccp_client *dc, *tmp;
187 if (listen_fd < 0 || !len)
190 list_for_each_entry_safe(dc, tmp, &clients, node) {
191 if (!dc->header_sent && current_chunk) {
192 header_buf = vss_get_header(&header_len);
193 if (header_buf && header_len > 0) {
194 if (queue_chunk_or_shutdown(dc, -1U, 0) < 0)
199 ret = send_queued_chunks(dc);
201 dccp_shutdown_client(dc);
204 // PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
205 ret = dccp_write(dc->fd, buf, len);
207 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
208 dccp_shutdown_client(dc);
212 queue_chunk_or_shutdown(dc, current_chunk, ret);
216 static void dccp_shutdown_clients(void)
218 struct dccp_client *dc, *tmp;
220 list_for_each_entry_safe(dc, tmp, &clients, node)
221 dccp_shutdown_client(dc);
224 static char *dccp_info(void)
228 struct dccp_client *dc, *tmp;
231 list_for_each_entry_safe(dc, tmp, &clients, node)
233 buf = make_message("dccp connected clients: %d\n", num_clients);
237 static char *dccp_help(void)
239 return make_message("no help available\n");
243 * the init function of the dccp sender
245 * \param s pointer to the dccp sender struct
247 * It initializes all function pointers of \a s and starts
248 * listening on the given port.
250 void dccp_send_init(struct sender *s)
254 INIT_LIST_HEAD(&clients);
257 s->pre_select = dccp_pre_select;
258 s->post_select = dccp_post_select;
259 s->shutdown_clients = dccp_shutdown_clients;
261 s->client_cmds[SENDER_ON] = NULL;
262 s->client_cmds[SENDER_OFF] = NULL;
263 s->client_cmds[SENDER_DENY] = NULL;
264 s->client_cmds[SENDER_ALLOW] = NULL;
265 s->client_cmds[SENDER_ADD] = NULL;
266 s->client_cmds[SENDER_DELETE] = NULL;
270 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
271 s->status = SENDER_OFF;
273 s->status = SENDER_ON;