/*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2011 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. */
+
+/*
+ * based on server.c of dccp-cs-0.01.tar.bz2,
+ * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
+ */
+
+#include <regex.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <osl.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 "send.h"
-#include "dccp.h"
-#include "error.h"
-#include "string.h"
+#include "vss.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;
-
-/** describes one connected client */
-struct dccp_client {
- /** the dccp socket */
- int fd;
- /** address information about the client */
- struct sockaddr_in addr;
- /** the position of this client in the client list */
- struct list_head node;
- int header_sent; /* non-zero if audio file header has been sent */
+#include "acl.h"
+
+static struct sender_status dccp_sender_status, *dss = &dccp_sender_status;
+
+struct dccp_fec_client {
+ struct fec_client_parms fcp;
+ struct fec_client *fc;
};
-static void dccp_pre_select(__unused struct audio_format *af, int *max_fileno, fd_set *rfds,
- __unused fd_set *wfds)
+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 = MAX(*max_fileno, listen_fd);
+ if (dss->listen_fd >= 0)
+ para_fd_set(dss->listen_fd, rfds, max_fileno);
}
-static void dccp_post_select(__unused struct audio_format *af, fd_set *rfds,
- __unused fd_set *wfds)
+/**
+ * Query the TX CCID used on the sender-client half connection.
+ * \param sockfd Server socket descriptor to query (after accept(2)).
+ * \return CCID number > 0, -1 on error/incompatibility.
+ *
+ * NB: This feature is only available on Linux > 2.6.30; on older kernels
+ * ENOPROTOOPT ("Protocol not available") will be returned.
+ */
+static int dccp_get_tx_ccid(int sockfd)
{
- struct dccp_client *dc;
- int ret;
+ int tx_ccid;
+ socklen_t len = sizeof(tx_ccid);
- if (!FD_ISSET(listen_fd, rfds))
- return;
- PARA_NOTICE_LOG("%s", "accepting...\n");
- dc = para_calloc(sizeof(struct dccp_client));
- ret = para_accept(listen_fd, &dc->addr, sizeof(struct sockaddr_in));
- if (ret < 0) {
- PARA_ERROR_LOG("%s", PARA_STRERROR(-ret));
- return;
+ if (getsockopt(sockfd, SOL_DCCP,
+ DCCP_SOCKOPT_TX_CCID, &tx_ccid, &len) < 0) {
+ PARA_WARNING_LOG("DCCP_SOCKOPT_TX_CCID: %s\n", strerror(errno));
+ return -1;
}
- PARA_NOTICE_LOG("%s", "connection\n");
- dc->fd = ret;
- list_add(&dc->node, &clients);
+ return tx_ccid;
}
-static int dccp_open(void)
+static void dccp_shutdown_client(struct sender_client *sc)
{
- struct sockaddr_in servaddr;
- int ret;
+ struct dccp_fec_client *dfc = sc->private_data;
- 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);
- return 1;
+ vss_del_fec_client(dfc->fc);
+ shutdown_client(sc, dss);
+}
+
+static void dccp_shutdown_clients(void)
+{
+ struct sender_client *sc, *tmp;
+
+ list_for_each_entry_safe(sc, tmp, &dss->client_list, node)
+ dccp_shutdown_client(sc);
+}
+
+/** * Obtain current MPS according to RFC 4340, sec. 14. */
+static int dccp_init_fec(struct sender_client *sc)
+{
+ int mps, ret;
+ socklen_t ml = sizeof(mps);
+
+ /* If call fails, return some sensible minimum value */
+ ret = getsockopt(sc->fd, SOL_DCCP, DCCP_SOCKOPT_GET_CUR_MPS, &mps, &ml);
+ if (ret < 0) {
+ PARA_NOTICE_LOG("can not determine MPS: %s\n", strerror(errno));
+ mps = generic_max_transport_msg_size(sc->fd) - DCCP_MAX_HEADER;
+ }
+ PARA_INFO_LOG("current MPS = %d bytes\n", mps);
+ assert(mps > 0);
+ if (conf.dccp_max_slice_size_arg > 0)
+ mps = PARA_MIN(mps, conf.dccp_max_slice_size_arg);
+ return mps;
}
-static void dccp_shutdown_client(struct dccp_client *dc)
+static int dccp_send_fec(struct sender_client *sc, char *buf, size_t len)
{
- close(dc->fd);
- list_del(&dc->node);
- free(dc);
+ int ret = write_nonblock(sc->fd, buf, len);
+
+ if (ret < 0)
+ dccp_shutdown_client(sc);
+ return ret;
}
-static void dccp_send(__unused struct audio_format *af,
- long unsigned current_chunk,
- __unused long unsigned chunks_sent, const char *buf, size_t len)
+static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
{
- struct dccp_client *dc, *tmp;
- int ret, header_len;
- char *header_buf;
+ struct sender_client *sc;
+ struct dccp_fec_client *dfc;
+ int tx_ccid;
- if (listen_fd < 0 || !len)
+ sc = accept_sender_client(dss, rfds);
+ if (!sc)
return;
- list_for_each_entry_safe(dc, tmp, &clients, node) {
- if (!_write_ok(dc->fd))
- 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 = write(dc->fd, header_buf, header_len);
- if (ret != header_len) {
- dccp_shutdown_client(dc);
- continue;
- }
- if (!_write_ok(dc->fd))
- continue;
- }
- PARA_DEBUG_LOG("writing %d bytes to fd %d\n", len, dc->fd);
- ret = write(dc->fd, buf, len);
- if (ret != len)
- dccp_shutdown_client(dc);
+ /* If CCID identifiable, present client as <host>#<port>~<ccid> */
+ tx_ccid = dccp_get_tx_ccid(sc->fd);
+ if (tx_ccid != -1) {
+ char *tmp = make_message("%s~%d", sc->name, tx_ccid);
+
+ free(sc->name);
+ sc->name = tmp;
+ }
+ /*
+ * 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(sc->fd, SHUT_RD) < 0) {
+ PARA_WARNING_LOG("%s\n", strerror(errno));
+ shutdown_client(sc, dss);
+ return;
}
+ dfc = para_calloc(sizeof(*dfc));
+ sc->private_data = dfc;
+ dfc->fcp.data_slices_per_group = conf.dccp_data_slices_per_group_arg;
+ dfc->fcp.slices_per_group = conf.dccp_slices_per_group_arg;
+ dfc->fcp.init_fec = dccp_init_fec;
+ dfc->fcp.send_fec = dccp_send_fec;
+ dfc->fcp.need_periodic_header = false;
+ dfc->fc = vss_add_fec_client(sc, &dfc->fcp);
}
-static void dccp_shutdown_clients(void)
+static int dccp_com_on(__a_unused struct sender_command_data *scd)
{
- struct dccp_client *dc, *tmp;
+ return generic_com_on(dss, IPPROTO_DCCP);
+}
- list_for_each_entry_safe(dc, tmp, &clients, node)
- dccp_shutdown_client(dc);
+static int dccp_com_off(__a_unused struct sender_command_data *scd)
+{
+ dccp_shutdown_clients();
+ generic_com_off(dss);
+ return 1;
}
-static char *dccp_info(void)
+
+static int dccp_com_deny(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("%d connected clients\n", num_clients);
- return buf;
+ generic_com_deny(scd, dss);
+ return 1;
}
-static char *dccp_help(void)
+static int dccp_com_allow(struct sender_command_data *scd)
{
- return make_message("no help available\n");
+ generic_com_allow(scd, dss);
+ return 1;
}
+/**
+ * Return list of available CCIDs or warning, in static buffer.
+ */
+static const char *dccp_list_available_ccids(void)
+{
+ /* Worst case length: n * 3 digits + n-1 spaces + '\0' */
+ static char list[DCCP_MAX_HOST_CCIDS * 4];
+ uint8_t *ccids;
+ int i, len, nccids;
+
+ nccids = dccp_available_ccids(&ccids);
+ if (nccids < 0) {
+ snprintf(list, sizeof(list), "Unable to query available CCIDs");
+ } else {
+ for (i = len = 0; i < nccids; i++)
+ len += snprintf(list + len, sizeof(list) - len,
+ "%s%d", i ? " " : "", ccids[i]);
+ }
+ return list;
+}
+
+static char *dccp_info(void)
+{
+ char *info = get_sender_info(dss, "dccp");
+ char *ret = make_message("%s" "\tsupported ccids: %s\n",
+ info, dccp_list_available_ccids());
+ free(info);
+ return ret;
+}
+
+/**
+ * The init function of the dccp sender.
+ *
+ * \param s pointer to the dccp sender struct.
+ *
+ * It initializes all function pointers of \a s and starts
+ * listening on the given port.
+ */
void dccp_send_init(struct sender *s)
{
- int ret;
+ int ret, k, n;
- INIT_LIST_HEAD(&clients);
s->info = dccp_info;
- s->send = dccp_send;
+ s->send = NULL;
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->resolve_target = 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();
+
+ k = conf.dccp_data_slices_per_group_arg;
+ n = conf.dccp_slices_per_group_arg;
+
+ if (k <= 0 || n <= 0 || k >= n) {
+ PARA_WARNING_LOG("invalid FEC parameters, using defaults\n");
+ conf.dccp_data_slices_per_group_arg = 3;
+ conf.dccp_slices_per_group_arg = 4;
+ }
+
+ 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));
- else
- s->status = SENDER_ON;
+ PARA_ERROR_LOG("%s\n", para_strerror(-ret));
}
projects / paraslash.git / blobdiff