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"
30 static void dccp_recv_close(struct receiver_node *rn)
34 btr_pool_free(rn->btrp);
37 static int dccp_recv_open(struct receiver_node *rn)
39 struct dccp_recv_args_info *conf = rn->conf;
40 struct flowopts *fo = NULL;
41 uint8_t *ccids = NULL;
44 /* Copy CCID preference list (u8 array required) */
45 if (conf->ccid_given) {
46 ccids = para_malloc(conf->ccid_given);
49 for (i = 0; i < conf->ccid_given; i++)
50 ccids[i] = conf->ccid_arg[i];
52 OPT_ADD(fo, SOL_DCCP, DCCP_SOCKOPT_CCID, ccids, i);
55 fd = makesock(IPPROTO_DCCP, 0, conf->host_arg, conf->port_arg, fo);
60 * Disable unused CCIDs: the receiver does not send any application
61 * data to the server. By shutting down this unused path we reduce
62 * internal processing costs, as the unused CCIDs (in the kernel) are
65 if (shutdown(fd, SHUT_WR) < 0) {
66 ret = -ERRNO_TO_PARA_ERROR(errno);
69 ret = mark_fd_nonblocking(fd);
72 rn->btrp = btr_pool_new("dccp_recv", 320 * 1024);
81 * Check whether the host supports the requested 'ccid' arguments.
82 * \param conf DCCP receiver arguments.
83 * \return True if all CCIDs requested in \a conf are supported.
85 static bool dccp_recv_ccid_support_check(struct dccp_recv_args_info *conf)
90 nccids = dccp_available_ccids(&ccids);
94 for (i = 0; i < conf->ccid_given; i++) {
95 for (j = 0; j < nccids && ccids[j] != conf->ccid_arg[i]; j++)
98 PARA_ERROR_LOG("'CCID-%d' not supported on this host.\n",
106 static void *dccp_recv_parse_config(int argc, char **argv)
108 struct dccp_recv_args_info *tmp = para_calloc(sizeof(*tmp));
110 if (!dccp_recv_cmdline_parser(argc, argv, tmp) &&
111 dccp_recv_ccid_support_check(tmp))
117 static void dccp_recv_pre_select(struct sched *s, struct task *t)
119 struct receiver_node *rn = container_of(t, struct receiver_node, task);
122 if (generic_recv_pre_select(s, t) <= 0)
124 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
127 static void dccp_recv_post_select(struct sched *s, struct task *t)
129 struct receiver_node *rn = container_of(t, struct receiver_node, task);
130 struct btr_node *btrn = rn->btrn;
135 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
138 iovcnt = btr_pool_get_buffers(rn->btrp, iov);
139 ret = -E_DCCP_OVERRUN;
142 ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
145 if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
146 btr_add_output_pool(rn->btrp, num_bytes, btrn);
147 else { /* both buffers contain data */
148 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
149 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
154 btr_remove_node(rn->btrn);
158 static void dccp_recv_free_config(void *conf)
160 dccp_recv_cmdline_parser_free(conf);
165 * The init function of the dccp receiver.
167 * \param r Pointer to the receiver struct to initialize.
169 * Initialize all function pointers of \a r.
171 void dccp_recv_init(struct receiver *r)
173 struct dccp_recv_args_info dummy;
175 dccp_recv_cmdline_parser_init(&dummy);
176 r->open = dccp_recv_open;
177 r->close = dccp_recv_close;
178 r->pre_select = dccp_recv_pre_select;
179 r->post_select = dccp_recv_post_select;
180 r->parse_config = dccp_recv_parse_config;
181 r->free_config = dccp_recv_free_config;
182 r->help = (struct ggo_help) {
183 .short_help = dccp_recv_args_info_help,
184 .detailed_help = dccp_recv_args_info_detailed_help
186 dccp_recv_cmdline_parser_free(&dummy);