2 * Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>
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>
14 #include <netinet/in.h>
15 #include <sys/socket.h>
17 #include <sys/types.h>
18 #include <arpa/inet.h>
23 #include "recv_cmd.lsg.h"
28 #include "buffer_tree.h"
34 static void dccp_recv_close(struct receiver_node *rn)
38 btr_pool_free(rn->btrp);
41 /* Check whether the host supports the requested 'ccid' arguments. */
42 static int dccp_recv_ccid_support_check(const struct lls_parse_result *lpr)
45 int i, j, ret, nccids;
46 unsigned given = RECV_CMD_OPT_GIVEN(DCCP, CCID, lpr);
48 ret = dccp_available_ccids(&ccids);
52 for (i = 0; i < given; i++) {
53 uint32_t val = lls_uint32_val(i,
54 RECV_CMD_OPT_RESULT(DCCP, CCID, lpr));
55 for (j = 0; j < nccids && ccids[j] != val; j++)
58 PARA_ERROR_LOG("'CCID-%u' not supported on this host\n",
60 return -ERRNO_TO_PARA_ERROR(EINVAL);
66 static int dccp_recv_open(struct receiver_node *rn)
68 struct lls_parse_result *lpr = rn->lpr;
69 struct flowopts *fo = NULL;
70 uint8_t *ccids = NULL;
72 const struct lls_opt_result *r_c = RECV_CMD_OPT_RESULT(DCCP, CCID, lpr);
73 const char *host = RECV_CMD_OPT_STRING_VAL(DCCP, HOST, lpr);
74 uint32_t port = RECV_CMD_OPT_UINT32_VAL(DCCP, PORT, lpr);
77 ret = dccp_recv_ccid_support_check(lpr);
80 /* Copy CCID preference list (u8 array required) */
81 given = lls_opt_given(r_c);
83 ccids = para_malloc(given);
85 for (i = 0; i < given; i++)
86 ccids[i] = lls_int32_val(i, r_c);
87 OPT_ADD(fo, SOL_DCCP, DCCP_SOCKOPT_CCID, ccids, i);
90 fd = makesock(IPPROTO_DCCP, 0, host, port, fo);
96 * Disable unused CCIDs: the receiver does not send any application
97 * data to the server. By shutting down this unused path we reduce
98 * internal processing costs, as the unused CCIDs (in the kernel) are
101 if (shutdown(fd, SHUT_WR) < 0) {
102 ret = -ERRNO_TO_PARA_ERROR(errno);
105 ret = mark_fd_nonblocking(fd);
108 rn->btrp = btr_pool_new("dccp_recv", 320 * 1024);
116 static void dccp_recv_pre_select(struct sched *s, void *context)
118 struct receiver_node *rn = context;
120 if (generic_recv_pre_select(s, rn) <= 0)
122 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
125 static int dccp_recv_post_select(struct sched *s, void *context)
127 struct receiver_node *rn = context;
128 struct btr_node *btrn = rn->btrn;
133 ret = task_get_notification(rn->task);
136 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
139 iovcnt = btr_pool_get_buffers(rn->btrp, iov);
140 ret = -E_DCCP_OVERRUN;
143 ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
146 if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
147 btr_add_output_pool(rn->btrp, num_bytes, btrn);
148 else { /* both buffers contain data */
149 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
150 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
154 btr_remove_node(&rn->btrn);
158 const struct receiver lsg_recv_cmd_com_dccp_user_data = {
159 .open = dccp_recv_open,
160 .close = dccp_recv_close,
161 .pre_select = dccp_recv_pre_select,
162 .post_select = dccp_recv_post_select,