/*
- * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
#include <regex.h>
#include <sys/types.h>
-#include <dirent.h>
#include <osl.h>
#include "para.h"
#include "server.h"
#include "net.h"
#include "list.h"
-#include "vss.h"
#include "send.h"
+#include "vss.h"
#include "fd.h"
#include "close_on_fork.h"
#include "chunk_queue.h"
#include "server.cmdline.h"
#include "acl.h"
-/** Do not write more than that many bytes at once. */
-#define DCCP_MAX_BYTES_PER_WRITE 1024
-
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(int *max_fileno, fd_set *rfds,
__a_unused fd_set *wfds)
{
para_fd_set(dss->listen_fd, rfds, max_fileno);
}
-static void dccp_post_select(fd_set *rfds, __a_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 sender_client *sc;
+ int tx_ccid;
+ socklen_t len = sizeof(tx_ccid);
+
+ 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;
+ }
+ return tx_ccid;
+}
- if (dss->listen_fd < 0 || !FD_ISSET(dss->listen_fd, rfds))
- return;
- sc = accept_sender_client(dss);
- if (!sc)
- 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(sc->fd, SHUT_RD) >= 0)
- return;
- PARA_WARNING_LOG("%s\n", strerror(errno));
+static void dccp_shutdown_client(struct sender_client *sc)
+{
+ struct dccp_fec_client *dfc = sc->private_data;
+
+ vss_del_fec_client(dfc->fc);
shutdown_client(sc, dss);
}
-static void dccp_send(long unsigned current_chunk,
- __a_unused long unsigned chunks_sent, const char *buf,
- size_t len, const char *header_buf, size_t header_len)
+static void dccp_shutdown_clients(void)
{
struct sender_client *sc, *tmp;
list_for_each_entry_safe(sc, tmp, &dss->client_list, node)
- send_chunk(sc, dss, DCCP_MAX_BYTES_PER_WRITE, current_chunk, buf,
- len, header_buf, header_len);
+ dccp_shutdown_client(sc);
}
-static void dccp_shutdown_clients(void)
+/** * Obtain current MPS according to RFC 4340, sec. 14. */
+static int dccp_init_fec(struct sender_client *sc)
{
- shutdown_clients(dss);
+ 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 int dccp_send_fec(struct sender_client *sc, char *buf, size_t len)
+{
+ int ret = write_nonblock(sc->fd, buf, len);
+
+ if (ret < 0)
+ dccp_shutdown_client(sc);
+ return ret;
+}
+
+static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
+{
+ struct sender_client *sc;
+ struct dccp_fec_client *dfc;
+ int tx_ccid;
+
+ sc = accept_sender_client(dss, rfds);
+ if (!sc)
+ return;
+
+ /* 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 int dccp_com_on(__a_unused struct sender_command_data *scd)
static int dccp_com_off(__a_unused struct sender_command_data *scd)
{
+ dccp_shutdown_clients();
generic_com_off(dss);
return 1;
}
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)
{
- return get_sender_info(dss, "dccp");
+ 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;
}
/**
*/
void dccp_send_init(struct sender *s)
{
- int ret;
+ int ret, k, n;
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->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_ADD] = NULL;
s->client_cmds[SENDER_DELETE] = NULL;
+ 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);
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