/*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file dccp_send.c paraslash's dccp sender */
* (C) 2005 Ian McDonald <imcdnzl@gmail.com>
*/
+#include <sys/types.h>
+#include <dirent.h>
+
+#include "para.h"
+#include "error.h"
+#include "string.h"
+#include "afh.h"
+#include "afs.h"
#include "server.h"
#include "net.h"
#include "list.h"
-#include "afs.h"
+#include "vss.h"
#include "send.h"
-#include "dccp.h"
-#include "error.h"
-#include "string.h"
+#include "fd.h"
+#include "close_on_fork.h"
+#include "chunk_queue.h"
#include "server.cmdline.h"
-extern struct gengetopt_args_info conf;
+
/** the list of connected clients **/
static struct list_head clients;
static int listen_fd = -1;
static struct sender *self;
+/** Maximal number of bytes in a chunk queue. */
+#define DCCP_MAX_PENDING_BYTES 40000
+
/** describes one connected client */
struct dccp_client {
/** the dccp socket */
int fd;
- /** address information about the client */
- struct sockaddr_in addr;
+ /** 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(__a_unused struct audio_format *af, 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)
*max_fileno = PARA_MAX(*max_fileno, listen_fd);
}
-static void dccp_post_select(__a_unused struct audio_format *af, fd_set *rfds,
- __a_unused fd_set *wfds)
+static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
{
struct dccp_client *dc;
int ret;
- if (!FD_ISSET(listen_fd, rfds))
+ if (listen_fd < 0 || !FD_ISSET(listen_fd, rfds))
return;
- dc = para_calloc(sizeof(struct dccp_client));
- ret = para_accept(listen_fd, &dc->addr, sizeof(struct sockaddr_in));
+ ret = para_accept(listen_fd, NULL, 0);
if (ret < 0) {
- PARA_ERROR_LOG("%s", PARA_STRERROR(-ret));
+ PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+ return;
+ }
+ /*
+ * 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(ret, SHUT_RD) < 0) {
+ PARA_ERROR_LOG("shutdown(SHUT_RD): %s\n", strerror(errno));
return;
}
- PARA_NOTICE_LOG("connection from %s\n", inet_ntoa(dc->addr.sin_addr));
+ dc = para_calloc(sizeof(struct dccp_client));
dc->fd = ret;
- list_add(&dc->node, &clients);
+ 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);
}
static int dccp_open(void)
{
- struct sockaddr_in servaddr;
- int ret;
+ int ret = para_listen(AF_UNSPEC, IPPROTO_DCCP, conf.dccp_port_arg);
- ret = dccp_get_socket();
if (ret < 0)
return ret;
listen_fd = ret;
-
- bzero(&servaddr, sizeof(servaddr));
- servaddr.sin_family = AF_INET;
- servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
- servaddr.sin_port = htons(conf.dccp_port_arg);
- ret = bind(listen_fd, (struct sockaddr *)&servaddr, sizeof(servaddr));
- if (ret < 0)
- return -E_DCCP_BIND;
- ret = dccp_set_socket(listen_fd);
- if (ret < 0)
- return ret;
- ret = listen(listen_fd, 0);
- if (ret < 0)
- return -E_DCCP_LISTEN;
- PARA_DEBUG_LOG("listening on fd %d\n", listen_fd);
+ add_close_on_fork_list(listen_fd);
+ mark_fd_nonblocking(listen_fd);
return 1;
}
static void dccp_shutdown_client(struct dccp_client *dc)
{
- PARA_DEBUG_LOG("shutting down %s (fd %d)\n", inet_ntoa(dc->addr.sin_addr),
- dc->fd);
+ 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);
}
+/*
+ * 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)
{
- size_t send, written = 0;
- int ret;
-again:
- send = PARA_MIN(1024, len - written);
- ret = write(fd, buf + written, send);
- if (ret < 0)
- goto err_out;
- written += ret;
- if (written >= len)
- return written;
- ret = write_ok(fd);
- if (ret > 0)
- goto again;
-err_out:
- return -E_DCCP_WRITE;
+ 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;
+}
+
+static int queue_chunk_or_shutdown(struct dccp_client *dc, long unsigned chunk_num,
+ size_t sent)
+{
+ int ret = cq_enqueue(dc->cq, chunk_num, sent);
+ if (ret < 0) {
+ PARA_NOTICE_LOG("enqueue error\n");
+ dccp_shutdown_client(dc);
+ }
+ return ret;
+}
+
+static int send_queued_chunks(struct dccp_client *dc)
+{
+ 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);
+ }
+ return 1;
}
-static void dccp_send(__a_unused struct audio_format *af,
- long unsigned current_chunk,
+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, header_len;
+ int ret;
char *header_buf;
+ size_t header_len;
if (listen_fd < 0 || !len)
return;
list_for_each_entry_safe(dc, tmp, &clients, node) {
- ret = write_ok(dc->fd);
+ 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;
}
- if (!ret)
- continue;
- if (!dc->header_sent && af->get_header_info && current_chunk) {
- header_buf = af->get_header_info(&header_len);
- if (!header_buf || header_len <= 0)
- continue; /* header not yet available */
- ret = dccp_write(dc->fd, header_buf, header_len);
- if (ret != header_len) {
- int err = errno;
- PARA_ERROR_LOG("header write: %d/%d (%s)\n",
- ret, header_len, ret < 0?
- strerror(err) : "");
- dccp_shutdown_client(dc);
- continue;
- }
- dc->header_sent = 1;
- ret = write_ok(dc->fd);
- if (ret < 0) {
- dccp_shutdown_client(dc);
- continue;
- }
- if (!ret)
- continue;
- }
// PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
ret = dccp_write(dc->fd, buf, len);
- if (ret != 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);
}
}
self = s;
ret = dccp_open();
if (ret < 0)
- PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
- else
- s->status = SENDER_ON;
+ PARA_ERROR_LOG("%s\n", para_strerror(-ret));
}
projects / paraslash.git / blobdiff