Merge branch 'master' into next
[paraslash.git] / dccp_recv.c
1 /*
2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file dccp_recv.c paraslash's dccp receiver */
8
9 /*
10 * based on client.c of dccp-cs-0.01.tar.bz2,
11 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
12 */
13
14 #include <regex.h>
15 #include <sys/types.h>
16 #include <dirent.h>
17
18 #include "para.h"
19 #include "error.h"
20 #include "list.h"
21 #include "sched.h"
22 #include "ggo.h"
23 #include "recv.h"
24 #include "string.h"
25 #include "net.h"
26 #include "fd.h"
27
28 #include "dccp_recv.cmdline.h"
29
30 /** the size of the output buffer */
31 #define DCCP_BUFSIZE 40960
32
33 /**
34 * data specific to the dccp receiver
35 *
36 * \sa receiver receiver_node
37 */
38 struct private_dccp_recv_data {
39 /** the file descriptor for the dccp socket */
40 int fd;
41 };
42
43
44 static void dccp_recv_close(struct receiver_node *rn)
45 {
46
47 struct private_dccp_recv_data *pdd = rn->private_data;
48
49 if (pdd && pdd->fd > 0)
50 close(pdd->fd);
51 free(rn->buf);
52 rn->buf = NULL;
53 free(rn->private_data);
54 rn->private_data = NULL;
55 }
56
57
58 static int dccp_recv_open(struct receiver_node *rn)
59 {
60 struct private_dccp_recv_data *pdd;
61 struct dccp_recv_args_info *conf = rn->conf;
62 int fd, ret = makesock(AF_UNSPEC, IPPROTO_DCCP, 0, conf->host_arg,
63 conf->port_arg);
64
65 if (ret < 0)
66 return ret;
67 fd = ret;
68 /*
69 * Disable unused CCIDs: the receiver does not send any application
70 * data to the server. By shutting down this unused path we reduce
71 * internal processing costs, as the unused CCIDs (in the kernel) are
72 * then bypassed.
73 */
74 if (shutdown(fd, SHUT_WR) < 0) {
75 ret = -ERRNO_TO_PARA_ERROR(errno);
76 goto err;
77 }
78 ret = mark_fd_nonblocking(fd);
79 if (ret < 0)
80 goto err;
81 rn->buf = para_calloc(DCCP_BUFSIZE);
82 rn->private_data = pdd = para_calloc(sizeof(struct private_dccp_recv_data));
83 pdd->fd = fd;
84 return 1;
85 err:
86 close(fd);
87 return ret;
88 }
89
90 static void dccp_shutdown(void)
91 {
92 ; /* nothing to do */
93 }
94
95 static void *dccp_recv_parse_config(int argc, char **argv)
96 {
97 struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
98
99 if (!dccp_recv_cmdline_parser(argc, argv, tmp))
100 return tmp;
101 free(tmp);
102 return NULL;
103 }
104
105 static void dccp_recv_pre_select(struct sched *s, struct task *t)
106 {
107 struct receiver_node *rn = container_of(t, struct receiver_node, task);
108 struct private_dccp_recv_data *pdd = rn->private_data;
109
110 t->error = 0;
111 para_fd_set(pdd->fd, &s->rfds, &s->max_fileno);
112 }
113
114 static void dccp_recv_post_select(struct sched *s, struct task *t)
115 {
116 struct receiver_node *rn = container_of(t, struct receiver_node, task);
117 struct private_dccp_recv_data *pdd = rn->private_data;
118
119 if (rn->output_error && *rn->output_error < 0) {
120 t->error = *rn->output_error;
121 return;
122 }
123 if (!FD_ISSET(pdd->fd, &s->rfds))
124 return; /* nothing to do */
125 if (rn->loaded >= DCCP_BUFSIZE) {
126 t->error = -E_DCCP_OVERRUN;
127 return;
128 }
129 t->error = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
130 DCCP_BUFSIZE - rn->loaded);
131 if (t->error > 0) {
132 rn->loaded += t->error;
133 return;
134 }
135 if (!t->error)
136 t->error = -E_RECV_EOF;
137 }
138
139 /**
140 * The init function of the dccp receiver.
141 *
142 * \param r Pointer to the receiver struct to initialize.
143 *
144 * Initialize all function pointers of \a r.
145 */
146 void dccp_recv_init(struct receiver *r)
147 {
148 struct dccp_recv_args_info dummy;
149
150 dccp_recv_cmdline_parser_init(&dummy);
151 r->shutdown = dccp_shutdown;
152 r->open = dccp_recv_open;
153 r->close = dccp_recv_close;
154 r->pre_select = dccp_recv_pre_select;
155 r->post_select = dccp_recv_post_select;
156 r->parse_config = dccp_recv_parse_config;
157 r->help = (struct ggo_help) {
158 .short_help = dccp_recv_args_info_help,
159 .detailed_help = dccp_recv_args_info_detailed_help
160 };
161 dccp_recv_cmdline_parser_free(&dummy);
162 }