X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=dccp_send.c;h=d66b800fb032525b26f02ff8fc5e58e7087f7adb;hp=02e60f44c680a0406826a3439543b1b389bbb456;hb=53a27fb91166a7734f0768721b2cef91f0f6172e;hpb=c568930c77d134f09c7a0aa59cb0622ae35fb7cb

diff --git a/dccp_send.c b/dccp_send.c
index 02e60f44..d66b800f 100644
--- a/dccp_send.c
+++ b/dccp_send.c
@@ -4,7 +4,7 @@
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file dccp_send.c paraslash's dccp sender */
+/** \file dccp_send.c Paraslash's dccp sender. */
 
 /*
  * based on server.c of dccp-cs-0.01.tar.bz2,
@@ -28,225 +28,88 @@
 #include "close_on_fork.h"
 #include "chunk_queue.h"
 #include "server.cmdline.h"
+#include "acl.h"
 
-/** the list of connected clients **/
-static struct list_head clients;
-static int listen_fd = -1;
-static struct sender *self;
+/** Do not write more than that many bytes at once. */
+#define DCCP_MAX_BYTES_PER_WRITE 1024
 
-/** Maximal number of bytes in a chunk queue. */
-#define DCCP_MAX_PENDING_BYTES 40000
+static struct sender_status dccp_sender_status, *dss = &dccp_sender_status;
 
-/** describes one connected client */
-struct dccp_client {
-	/** the dccp socket */
-	int fd;
-	/** The socket `name' of the client. */
-	char *name;
-	/** the position of this client in the client list */
-	struct list_head node;
-	/** non-zero if audio file header has been sent */
-	int header_sent;
-	/** The list of pending chunks for this client. */
-	struct chunk_queue *cq;
-};
-
-static void dccp_pre_select( int *max_fileno, fd_set *rfds,
+static void dccp_pre_select(int *max_fileno, fd_set *rfds,
 		__a_unused fd_set *wfds)
 {
-	if (listen_fd < 0)
-		return;
-	FD_SET(listen_fd, rfds);
-	*max_fileno = PARA_MAX(*max_fileno, listen_fd);
+	if (dss->listen_fd >= 0)
+		para_fd_set(dss->listen_fd, rfds, max_fileno);
 }
 
 static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 {
-	struct dccp_client *dc;
-	int ret, fd;
+	struct sender_client *sc;
 
-	if (listen_fd < 0 || !FD_ISSET(listen_fd, rfds))
+	if (dss->listen_fd < 0 || !FD_ISSET(dss->listen_fd, rfds))
 		return;
-	ret = para_accept(listen_fd, NULL, 0);
-	if (ret < 0) {
-		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	sc = accept_sender_client(dss);
+	if (!sc)
 		return;
-	}
-	fd = ret;
 	/*
 	 * Bypass unused CCID paths: the sender does not receive application data
 	 * from the client; by shutting down this unused communication path we can
 	 * reduce processing costs a bit. See analogous comment in dccp_recv.c.
 	 */
-	if (shutdown(fd, SHUT_RD) < 0) {
-		PARA_ERROR_LOG("shutdown(SHUT_RD): %s\n", strerror(errno));
-		goto err;
-	}
-	dc = para_calloc(sizeof(struct dccp_client));
-	dc->fd = ret;
-	dc->name = make_message("%s", remote_name(dc->fd));
-	PARA_NOTICE_LOG("connection from %s\n", dc->name);
-	para_list_add(&dc->node, &clients);
-	add_close_on_fork_list(dc->fd);
-	mark_fd_nonblocking(dc->fd);
-	dc->cq = cq_new(DCCP_MAX_PENDING_BYTES);
-	return;
-err:
-	close(fd);
+	if (shutdown(sc->fd, SHUT_RD) >= 0)
+		return;
+	PARA_WARNING_LOG("%s\n", strerror(errno));
+	shutdown_client(sc, dss);
 }
 
-static int dccp_open(void)
+static void dccp_send(long unsigned current_chunk,
+		__a_unused long unsigned chunks_sent, const char *buf, size_t len)
 {
-	int ret = para_listen(AF_UNSPEC, IPPROTO_DCCP, conf.dccp_port_arg);
-
-	if (ret < 0)
-		return ret;
-	listen_fd = ret;
-	ret = mark_fd_nonblocking(listen_fd);
-	if (ret < 0) {
-		PARA_EMERG_LOG("%s\n", para_strerror(-ret));
-		exit(EXIT_FAILURE);
-	}
-	add_close_on_fork_list(listen_fd);
-	return 1;
-}
+	struct sender_client *sc, *tmp;
 
-static void dccp_shutdown_client(struct dccp_client *dc)
-{
-	PARA_DEBUG_LOG("shutting down %s (fd %d)\n", dc->name, dc->fd);
-	free(dc->name);
-	close(dc->fd);
-	del_close_on_fork_list(dc->fd);
-	cq_destroy(dc->cq);
-	list_del(&dc->node);
-	free(dc);
+	list_for_each_entry_safe(sc, tmp, &dss->client_list, node)
+		send_chunk(sc, dss, DCCP_MAX_BYTES_PER_WRITE, current_chunk, buf,
+			len);
 }
 
-/*
- * ret: Negative on errors, zero if nothing was written and write returned
- * EAGAIN, number of bytes written else.
- */
-static int dccp_write(int fd, const char *buf, size_t len)
+static void dccp_shutdown_clients(void)
 {
-	size_t written = 0;
-	int ret = 0;
-
-	while (written < len) {
-		ret = write(fd, buf + written, PARA_MIN(1024, len - written));
-		/*
-		 * Error handling: CCID3 has a sending wait queue which fills up and is
-		 * emptied asynchronously. The EAGAIN case means that there is currently
-		 * no space in the wait queue, but this can change at any moment and is
-		 * thus not an error condition.
-		 */
-		if (ret < 0 && errno == EAGAIN)
-			return written;
-		if (ret < 0) {
-			PARA_ERROR_LOG("%s\n", strerror(errno));
-			return -E_DCCP_WRITE;
-		}
-		written += ret;
-	}
-	return written;
+	shutdown_clients(dss);
 }
 
-static int queue_chunk_or_shutdown(struct dccp_client *dc, long unsigned chunk_num,
-	size_t sent)
+static int dccp_com_on(__a_unused struct sender_command_data *scd)
 {
-	int ret = cq_enqueue(dc->cq, chunk_num, sent);
-	if (ret < 0) {
-		PARA_NOTICE_LOG("enqueue error\n");
-		dccp_shutdown_client(dc);
-	}
-	return ret;
+	return generic_com_on(dss, IPPROTO_DCCP);
 }
 
-static int send_queued_chunks(struct dccp_client *dc)
+static int dccp_com_off(__a_unused struct sender_command_data *scd)
 {
-	struct queued_chunk *qc;
-	while ((qc = cq_peek(dc->cq))) {
-		char *buf;
-		size_t len;
-		int ret;
-		cq_get(qc, &buf, &len);
-		ret = dccp_write(dc->fd, buf, len);
-		if (ret < 0)
-			return ret;
-		cq_update(dc->cq, ret);
-		if (ret != len)
-			return 1;
-		cq_dequeue(dc->cq);
-	}
+	generic_com_off(dss);
 	return 1;
 }
 
-static void dccp_send(long unsigned current_chunk,
-		__a_unused long unsigned chunks_sent, const char *buf, size_t len)
-{
-	struct dccp_client *dc, *tmp;
-	int ret;
-	char *header_buf;
-	size_t header_len;
-
-	if (listen_fd < 0 || !len)
-		return;
-
-	list_for_each_entry_safe(dc, tmp, &clients, node) {
-		if (!dc->header_sent && current_chunk) {
-			header_buf = vss_get_header(&header_len);
-			if (header_buf && header_len > 0) {
-				if (queue_chunk_or_shutdown(dc, -1U, 0) < 0)
-					continue;
-			}
-			dc->header_sent = 1;
-		}
-		ret = send_queued_chunks(dc);
-		if (ret < 0) {
-			dccp_shutdown_client(dc);
-			continue;
-		}
-//		PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
-		ret = dccp_write(dc->fd, buf, len);
-		if (ret < 0) {
-			PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
-			dccp_shutdown_client(dc);
-			continue;
-		}
-		if (ret != len)
-			queue_chunk_or_shutdown(dc, current_chunk, ret);
-	}
-}
 
-static void dccp_shutdown_clients(void)
+static int dccp_com_deny(struct sender_command_data *scd)
 {
-	struct dccp_client *dc, *tmp;
-
-	list_for_each_entry_safe(dc, tmp, &clients, node)
-		dccp_shutdown_client(dc);
+	generic_com_deny(scd, dss);
+	return 1;
 }
 
-static char *dccp_info(void)
+static int dccp_com_allow(struct sender_command_data *scd)
 {
-	static char *buf;
-	int num_clients = 0;
-	struct dccp_client *dc, *tmp;
-
-	free(buf);
-	list_for_each_entry_safe(dc, tmp, &clients, node)
-		num_clients++;
-	buf = make_message("dccp connected clients: %d\n", num_clients);
-	return buf;
+	generic_com_allow(scd, dss);
+	return 1;
 }
 
-static char *dccp_help(void)
+static char *dccp_info(void)
 {
-	return make_message("no help available\n");
+	return get_sender_info(dss, "dccp");
 }
 
 /**
- * the init function of the dccp sender
+ * The init function of the dccp sender.
  *
- * \param s pointer to the dccp sender struct
+ * \param s pointer to the dccp sender struct.
  *
  * It initializes all function pointers of \a s and starts
  * listening on the given port.
@@ -255,21 +118,23 @@ void dccp_send_init(struct sender *s)
 {
 	int ret;
 
-	INIT_LIST_HEAD(&clients);
 	s->info = dccp_info;
 	s->send = dccp_send;
 	s->pre_select = dccp_pre_select;
 	s->post_select = dccp_post_select;
 	s->shutdown_clients = dccp_shutdown_clients;
-	s->help = dccp_help;
-	s->client_cmds[SENDER_ON] = NULL;
-	s->client_cmds[SENDER_OFF] = NULL;
-	s->client_cmds[SENDER_DENY] = NULL;
-	s->client_cmds[SENDER_ALLOW] = NULL;
+	s->help = generic_sender_help;
+	s->client_cmds[SENDER_ON] = dccp_com_on;
+	s->client_cmds[SENDER_OFF] = dccp_com_off;
+	s->client_cmds[SENDER_DENY] = dccp_com_deny;
+	s->client_cmds[SENDER_ALLOW] = dccp_com_allow;
 	s->client_cmds[SENDER_ADD] = NULL;
 	s->client_cmds[SENDER_DELETE] = NULL;
-	self = s;
-	ret = dccp_open();
+
+	init_sender_status(dss, conf.dccp_access_arg, conf.dccp_access_given,
+		conf.dccp_port_arg, conf.dccp_max_clients_arg,
+		conf.dccp_default_deny_given);
+	ret = generic_com_on(dss, IPPROTO_DCCP);
 	if (ret < 0)
 		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 }