/*
- * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
*
* 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,
* (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 "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
-
-/** 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 struct sender_status dccp_sender_status, *dss = &dccp_sender_status;
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);
+}
+
+/**
+ * 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)
+{
+ 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;
}
static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds)
{
- struct dccp_client *dc;
- int ret, fd;
+ struct sender_client *sc;
+ int tx_ccid;
- if (listen_fd < 0 || !FD_ISSET(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, 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;
}
- 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;
- }
- ret = mark_fd_nonblocking(fd);
- if (ret < 0) {
- PARA_ERROR_LOG("%s\n", para_strerror(-ret));
- goto err;
- }
- dc = para_calloc(sizeof(struct dccp_client));
- dc->fd = fd;
- 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);
- 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, const char *header_buf, size_t header_len)
{
- int ret = para_listen(AF_UNSPEC, IPPROTO_DCCP, conf.dccp_port_arg);
+ struct sender_client *sc, *tmp;
- 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;
+ 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);
}
-static void dccp_shutdown_client(struct dccp_client *dc)
+static void dccp_shutdown_clients(void)
{
- 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);
+ shutdown_clients(dss);
}
-/*
- * 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 int dccp_com_on(__a_unused struct sender_command_data *scd)
{
- 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)
- return -ERRNO_TO_PARA_ERROR(errno);
- written += ret;
- }
- return written;
+ return generic_com_on(dss, IPPROTO_DCCP);
}
-static int queue_chunk_or_shutdown(struct dccp_client *dc, long unsigned chunk_num,
- size_t sent)
+static int dccp_com_off(__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;
+ generic_com_off(dss);
+ return 1;
}
-static int send_queued_chunks(struct dccp_client *dc)
+
+static int dccp_com_deny(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_deny(scd, dss);
return 1;
}
-static void dccp_send(long unsigned current_chunk,
- __a_unused long unsigned chunks_sent, const char *buf, size_t len)
+static int dccp_com_allow(struct sender_command_data *scd)
{
- struct dccp_client *dc, *tmp;
- int ret;
- char *header_buf;
-
- list_for_each_entry_safe(dc, tmp, &clients, node) {
- if (!dc->header_sent && current_chunk) {
- size_t header_len;
- 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 (!len)
- 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);
- }
+ generic_com_allow(scd, dss);
+ return 1;
}
-static void dccp_shutdown_clients(void)
+/**
+ * Return list of available CCIDs or warning, in static buffer.
+ */
+static const char *dccp_list_available_ccids(void)
{
- struct dccp_client *dc, *tmp;
-
- list_for_each_entry_safe(dc, tmp, &clients, node)
- dccp_shutdown_client(dc);
+ /* 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)
{
- 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;
-}
-
-static char *dccp_help(void)
-{
- return make_message("no help available\n");
+ 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
+ * 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.
{
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));
}
projects / paraslash.git / blobdiff