2 * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file dccp_recv.c paraslash's dccp receiver */
10 * based on client.c of dccp-cs-0.01.tar.bz2,
11 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
15 #include <sys/types.h>
26 #include "buffer_tree.h"
28 #include "dccp_recv.cmdline.h"
31 * data specific to the dccp receiver
33 * \sa receiver receiver_node
35 struct private_dccp_recv_data {
36 /** the file descriptor for the dccp socket */
38 struct btr_pool *btrp;
41 static void dccp_recv_close(struct receiver_node *rn)
43 struct private_dccp_recv_data *pdd = rn->private_data;
49 btr_pool_free(pdd->btrp);
51 rn->private_data = NULL;
54 static int dccp_recv_open(struct receiver_node *rn)
56 struct private_dccp_recv_data *pdd;
57 struct dccp_recv_args_info *conf = rn->conf;
58 struct flowopts *fo = NULL;
59 uint8_t *ccids = NULL;
62 /* Copy CCID preference list (u8 array required) */
63 if (conf->ccid_given) {
64 ccids = para_malloc(conf->ccid_given);
67 for (i = 0; i < conf->ccid_given; i++)
68 ccids[i] = conf->ccid_arg[i];
70 OPT_ADD(fo, SOL_DCCP, DCCP_SOCKOPT_CCID, ccids, i);
73 fd = makesock(IPPROTO_DCCP, 0, conf->host_arg, conf->port_arg, fo);
78 * Disable unused CCIDs: the receiver does not send any application
79 * data to the server. By shutting down this unused path we reduce
80 * internal processing costs, as the unused CCIDs (in the kernel) are
83 if (shutdown(fd, SHUT_WR) < 0) {
84 ret = -ERRNO_TO_PARA_ERROR(errno);
87 ret = mark_fd_nonblocking(fd);
90 rn->private_data = pdd = para_calloc(sizeof(struct private_dccp_recv_data));
91 pdd->btrp = btr_pool_new("dccp_recv", 320 * 1024);
100 * Check whether the host supports the requested 'ccid' arguments.
101 * \param conf DCCP receiver arguments.
102 * \return True if all CCIDs requested in \a conf are supported.
104 static bool dccp_recv_ccid_support_check(struct dccp_recv_args_info *conf)
109 nccids = dccp_available_ccids(&ccids);
113 for (i = 0; i < conf->ccid_given; i++) {
114 for (j = 0; j < nccids && ccids[j] != conf->ccid_arg[i]; j++)
117 PARA_ERROR_LOG("'CCID-%d' not supported on this host.\n",
125 static void *dccp_recv_parse_config(int argc, char **argv)
127 struct dccp_recv_args_info *tmp = para_calloc(sizeof(*tmp));
129 if (!dccp_recv_cmdline_parser(argc, argv, tmp) &&
130 dccp_recv_ccid_support_check(tmp))
136 static void dccp_recv_pre_select(struct sched *s, struct task *t)
138 struct receiver_node *rn = container_of(t, struct receiver_node, task);
139 struct private_dccp_recv_data *pdd = rn->private_data;
142 if (generic_recv_pre_select(s, t) <= 0)
144 para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
147 static void dccp_recv_post_select(struct sched *s, struct task *t)
149 struct receiver_node *rn = container_of(t, struct receiver_node, task);
150 struct private_dccp_recv_data *pdd = rn->private_data;
151 struct btr_node *btrn = rn->btrn;
156 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
159 iovcnt = btr_pool_get_buffers(pdd->btrp, iov);
160 ret = -E_DCCP_OVERRUN;
163 ret = readv_nonblock(pdd->fd, iov, iovcnt, &s->rfds, &num_bytes);
166 if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
167 btr_add_output_pool(pdd->btrp, num_bytes, btrn);
168 else { /* both buffers contain data */
169 btr_add_output_pool(pdd->btrp, iov[0].iov_len, btrn);
170 btr_add_output_pool(pdd->btrp, num_bytes - iov[0].iov_len, btrn);
175 btr_remove_node(rn->btrn);
179 static void dccp_recv_free_config(void *conf)
181 dccp_recv_cmdline_parser_free(conf);
186 * The init function of the dccp receiver.
188 * \param r Pointer to the receiver struct to initialize.
190 * Initialize all function pointers of \a r.
192 void dccp_recv_init(struct receiver *r)
194 struct dccp_recv_args_info dummy;
196 dccp_recv_cmdline_parser_init(&dummy);
197 r->open = dccp_recv_open;
198 r->close = dccp_recv_close;
199 r->pre_select = dccp_recv_pre_select;
200 r->post_select = dccp_recv_post_select;
201 r->parse_config = dccp_recv_parse_config;
202 r->free_config = dccp_recv_free_config;
203 r->help = (struct ggo_help) {
204 .short_help = dccp_recv_args_info_help,
205 .detailed_help = dccp_recv_args_info_detailed_help
207 dccp_recv_cmdline_parser_free(&dummy);