X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=dccp_send.c;h=d0f9448e8e048445ce0e0c6a6adf8d0d903449cc;hp=5478c1d19a23210ae719a4f0c80e9cca56376541;hb=5b8e525dfb2f18a4e0d67b9da264259159ad2184;hpb=41b4536e1918774bb30480e3437247e18bc81a35 diff --git a/dccp_send.c b/dccp_send.c index 5478c1d1..d0f9448e 100644 --- a/dccp_send.c +++ b/dccp_send.c @@ -1,167 +1,135 @@ /* - * Copyright (C) 2006 Andre Noll + * Copyright (C) 2006-2008 Andre Noll * - * 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 */ +#include +#include + +#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; +#include "acl.h" + /** the list of connected clients **/ static struct list_head clients; +/** The whitelist/blacklist. */ +static struct list_head dccp_acl; 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 */ -}; - -static void dccp_pre_select(__unused struct audio_format *af, int *max_fileno, fd_set *rfds, - __unused fd_set *wfds) + +/** Maximal number of bytes in a chunk queue. */ +#define DCCP_MAX_PENDING_BYTES 40000 + +/** Do not write more than that many bytes at once. */ +#define DCCP_MAX_BYTES_PER_WRITE 1024 + +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 (listen_fd >= 0) + para_fd_set(listen_fd, rfds, max_fileno); } -static void dccp_post_select(__unused struct audio_format *af, fd_set *rfds, - __unused fd_set *wfds) +static void dccp_post_select(fd_set *rfds, __a_unused fd_set *wfds) { - struct dccp_client *dc; - int ret; + struct sender_client *sc; + int ret, fd; - if (!FD_ISSET(listen_fd, rfds)) + if (listen_fd < 0 || !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)); + 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; } - PARA_NOTICE_LOG("%s", "connection\n"); - dc->fd = ret; - list_add(&dc->node, &clients); -} - -static int dccp_open(void) -{ - struct sockaddr_in servaddr; - int ret; - - 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); + 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) { + ret = -ERRNO_TO_PARA_ERROR(errno); + goto err; + } + ret = mark_fd_nonblocking(fd); if (ret < 0) - return ret; - ret = listen(listen_fd, 0); + goto err; + ret = acl_check_access(fd, &dccp_acl, conf.dccp_default_deny_given); if (ret < 0) - return -E_DCCP_LISTEN; - PARA_DEBUG_LOG("listening on fd %d\n", listen_fd); - return 1; + goto err; + sc = para_calloc(sizeof(*sc)); + sc->fd = fd; + sc->name = make_message("%s", remote_name(sc->fd)); + PARA_NOTICE_LOG("connection from %s\n", sc->name); + para_list_add(&sc->node, &clients); + add_close_on_fork_list(sc->fd); + sc->cq = cq_new(DCCP_MAX_PENDING_BYTES); + return; +err: + PARA_ERROR_LOG("%s\n", para_strerror(-ret)); + close(fd); } -static void dccp_shutdown_client(struct dccp_client *dc) +static void dccp_send(long unsigned current_chunk, + __a_unused long unsigned chunks_sent, const char *buf, size_t len) { - close(dc->fd); - list_del(&dc->node); - free(dc); + struct sender_client *sc, *tmp; + + list_for_each_entry_safe(sc, tmp, &clients, node) + send_chunk(sc, DCCP_MAX_BYTES_PER_WRITE, current_chunk, buf, + len); } -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_shutdown_clients(void) { - struct dccp_client *dc, *tmp; - int ret, header_len; - char *header_buf; - - if (listen_fd < 0 || !len) - return; + struct sender_client *sc, *tmp; - 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); - } + list_for_each_entry_safe(sc, tmp, &clients, node) + shutdown_client(sc); } -static void dccp_shutdown_clients(void) +static int dccp_com_deny(struct sender_command_data *scd) { - struct dccp_client *dc, *tmp; + acl_deny(scd->addr, scd->netmask, &dccp_acl, + conf.dccp_default_deny_given); + return 1; +} - list_for_each_entry_safe(dc, tmp, &clients, node) - dccp_shutdown_client(dc); +static int dccp_com_allow(struct sender_command_data *scd) +{ + acl_allow(scd->addr, scd->netmask, &dccp_acl, + conf.dccp_default_deny_given); + return 1; } static char *dccp_info(void) { - static char *buf; int num_clients = 0; - struct dccp_client *dc, *tmp; + struct sender_client *sc, *tmp; - free(buf); - list_for_each_entry_safe(dc, tmp, &clients, node) + list_for_each_entry_safe(sc, tmp, &clients, node) num_clients++; - buf = make_message("%d connected clients\n", num_clients); - return buf; + return make_message("dccp connected clients: %d\n", num_clients); } static char *dccp_help(void) @@ -169,6 +137,14 @@ static char *dccp_help(void) return make_message("no help available\n"); } +/** + * 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; @@ -182,14 +158,14 @@ void dccp_send_init(struct sender *s) 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->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(); + acl_init(&dccp_acl, conf.dccp_access_arg, conf.dccp_access_given); + ret = open_sender(IPPROTO_DCCP, conf.dccp_port_arg); if (ret < 0) - PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret)); + PARA_ERROR_LOG("%s\n", para_strerror(-ret)); else - s->status = SENDER_ON; + listen_fd = ret; }