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>
14 #include <sys/types.h>
28 #include "close_on_fork.h"
29 #include "chunk_queue.h"
30 #include "server.cmdline.h"
32 /** the list of connected clients **/
33 static struct list_head clients;
34 static int listen_fd = -1;
35 static struct sender *self;
37 /** Maximal number of bytes in a chunk queue. */
38 #define DCCP_MAX_PENDING_BYTES 40000
40 /** describes one connected client */
42 /** the dccp socket */
44 /** address information about the client */
45 struct sockaddr_in addr;
46 /** the position of this client in the client list */
47 struct list_head node;
48 /** non-zero if audio file header has been sent */
50 /** The list of pending chunks for this client. */
51 struct chunk_queue *cq;
54 static void dccp_pre_select( int *max_fileno, fd_set *rfds,
55 __a_unused fd_set *wfds)
59 FD_SET(listen_fd, rfds);
60 *max_fileno = PARA_MAX(*max_fileno, listen_fd);
63 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
65 struct dccp_client *dc;
68 if (!FD_ISSET(listen_fd, rfds))
70 dc = para_calloc(sizeof(struct dccp_client));
71 ret = para_accept(listen_fd, &dc->addr, sizeof(struct sockaddr_in));
73 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
76 PARA_NOTICE_LOG("connection from %s\n", inet_ntoa(dc->addr.sin_addr));
78 para_list_add(&dc->node, &clients);
79 add_close_on_fork_list(dc->fd);
80 mark_fd_nonblock(dc->fd);
81 dc->cq = cq_new(DCCP_MAX_PENDING_BYTES);
84 static int dccp_open(void)
86 struct sockaddr_in servaddr;
89 ret = dccp_get_socket();
94 memset(&servaddr, 0, sizeof(servaddr));
95 servaddr.sin_family = AF_INET;
96 servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
97 servaddr.sin_port = htons(conf.dccp_port_arg);
98 ret = bind(listen_fd, (struct sockaddr *)&servaddr, sizeof(servaddr));
101 ret = dccp_set_socket(listen_fd);
104 ret = listen(listen_fd, 0);
106 PARA_ERROR_LOG("%s\n", strerror(errno));
107 return -E_DCCP_LISTEN;
109 PARA_DEBUG_LOG("listening on fd %d\n", listen_fd);
110 add_close_on_fork_list(listen_fd);
111 mark_fd_nonblock(listen_fd);
115 static void dccp_shutdown_client(struct dccp_client *dc)
117 PARA_DEBUG_LOG("shutting down %s (fd %d)\n", inet_ntoa(dc->addr.sin_addr),
120 del_close_on_fork_list(dc->fd);
127 * ret: Negative on errors, zero if nothing was written and write returned
128 * EAGAIN, number of bytes written else.
130 static int dccp_write(int fd, const char *buf, size_t len)
135 while (written < len) {
136 ret = write(fd, buf + written, PARA_MIN(1024, len - written));
138 * Error handling: CCID3 has a sending wait queue which fills up and is
139 * emptied asynchronously. The EAGAIN case means that there is currently
140 * no space in the wait queue, but this can change at any moment and is
141 * thus not an error condition.
143 if (ret < 0 && errno == EAGAIN)
146 PARA_ERROR_LOG("%s\n", strerror(errno));
147 return -E_DCCP_WRITE;
154 static int queue_chunk_or_shutdown(struct dccp_client *dc, long unsigned chunk_num,
157 int ret = cq_enqueue(dc->cq, chunk_num, sent);
159 PARA_NOTICE_LOG("enqueue error\n");
160 dccp_shutdown_client(dc);
165 static int send_queued_chunks(struct dccp_client *dc)
167 struct queued_chunk *qc;
168 while ((qc = cq_peek(dc->cq))) {
172 cq_get(qc, &buf, &len);
173 ret = dccp_write(dc->fd, buf, len);
176 cq_update(dc->cq, ret);
184 static void dccp_send(long unsigned current_chunk,
185 __a_unused long unsigned chunks_sent, const char *buf, size_t len)
187 struct dccp_client *dc, *tmp;
192 if (listen_fd < 0 || !len)
195 list_for_each_entry_safe(dc, tmp, &clients, node) {
196 if (!dc->header_sent && current_chunk) {
197 header_buf = vss_get_header(&header_len);
198 if (header_buf && header_len > 0) {
199 if (queue_chunk_or_shutdown(dc, -1U, 0) < 0)
204 ret = send_queued_chunks(dc);
206 dccp_shutdown_client(dc);
209 // PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
210 ret = dccp_write(dc->fd, buf, len);
212 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret));
213 dccp_shutdown_client(dc);
217 queue_chunk_or_shutdown(dc, current_chunk, ret);
221 static void dccp_shutdown_clients(void)
223 struct dccp_client *dc, *tmp;
225 list_for_each_entry_safe(dc, tmp, &clients, node)
226 dccp_shutdown_client(dc);
229 static char *dccp_info(void)
233 struct dccp_client *dc, *tmp;
236 list_for_each_entry_safe(dc, tmp, &clients, node)
238 buf = make_message("dccp connected clients: %d\n", num_clients);
242 static char *dccp_help(void)
244 return make_message("no help available\n");
248 * the init function of the dccp sender
250 * \param s pointer to the dccp sender struct
252 * It initializes all function pointers of \a s and starts
253 * listening on the given port.
255 void dccp_send_init(struct sender *s)
259 INIT_LIST_HEAD(&clients);
262 s->pre_select = dccp_pre_select;
263 s->post_select = dccp_post_select;
264 s->shutdown_clients = dccp_shutdown_clients;
266 s->client_cmds[SENDER_ON] = NULL;
267 s->client_cmds[SENDER_OFF] = NULL;
268 s->client_cmds[SENDER_DENY] = NULL;
269 s->client_cmds[SENDER_ALLOW] = NULL;
270 s->client_cmds[SENDER_ADD] = NULL;
271 s->client_cmds[SENDER_DELETE] = NULL;
275 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
276 s->status = SENDER_OFF;
278 s->status = SENDER_ON;