5cd523ae8cf2a1ace953bb0e85fb717620419efc
[paraslash.git] / dccp_recv.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /*
20 * based on client.c of dccp-cs-0.01.tar.bz2,
21 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
22 */
23
24 #include "para.h"
25 #include "error.h"
26 #include "dccp.h"
27 #include "recv.h"
28 #include "string.h"
29 #include "net.h"
30
31 #include "dccp_recv.cmdline.h"
32
33 /* needed by getaddrinfo */
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <netdb.h>
37
38
39 #define DCCP_BUFSIZE 40960
40
41 /**
42 * data specific to the dccp receiver
43 *
44 * \sa receiver receiver_node
45 */
46 struct private_dccp_recv_data {
47 /** the file descriptor for the dccp socket */
48 int fd;
49 };
50
51
52 static void dccp_recv_close(struct receiver_node *rn)
53 {
54
55 struct private_dccp_recv_data *pdd = rn->private_data;
56
57 if (pdd && pdd->fd > 0)
58 close(pdd->fd);
59 free(rn->buf);
60 rn->buf = NULL;
61 free(rn->private_data);
62 rn->private_data = NULL;
63 }
64
65
66 static int dccp_recv_open(struct receiver_node *rn)
67 {
68 struct private_dccp_recv_data *pdd;
69 struct gengetopt_args_info *conf = rn->conf;
70 int ret;
71 struct addrinfo *ai;
72 char *tmp;
73
74 rn->buf = para_calloc(DCCP_BUFSIZE);
75 rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
76 pdd = rn->private_data;
77 ret = dccp_get_socket();
78 if (ret < 0)
79 goto err_out;
80 pdd->fd = ret;
81
82 tmp = make_message("%d", conf->port_arg);
83 ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
84 free(tmp);
85 if (ret) {
86 ret = -E_ADDR_INFO;
87 goto err_out;
88 }
89 ret = dccp_set_socket(pdd->fd);
90 if (ret < 0)
91 goto err_out;
92 PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
93 ret = -E_DCCP_CONNECT;
94 if (connect(pdd->fd, ai->ai_addr, ai->ai_addrlen) < 0)
95 goto err_out;
96 return 1;
97 err_out:
98 dccp_recv_close(rn);
99 return ret;
100 }
101
102 static void dccp_shutdown(void)
103 {
104 ; /* nothing to do */
105 }
106
107 static void *dccp_recv_parse_config(int argc, char **argv)
108 {
109 struct gengetopt_args_info *tmp = para_calloc(sizeof(struct gengetopt_args_info));
110
111 if (!dccp_recv_cmdline_parser(argc, argv, tmp))
112 return tmp;
113 free(tmp);
114 return NULL;
115 }
116
117 static int dccp_recv_pre_select(struct receiver_node *rn, fd_set *rfds,
118 __unused fd_set *wfds, __unused struct timeval *timeout)
119 {
120 struct private_dccp_recv_data *pdd = rn->private_data;
121
122 if (!pdd)
123 return -1;
124 FD_SET(pdd->fd, rfds);
125 return pdd->fd;
126 }
127
128 static int dccp_recv_post_select(struct receiver_node *rn, int select_ret,
129 fd_set *rfds, __unused fd_set *wfds)
130 {
131 int ret;
132 struct private_dccp_recv_data *pdd = rn->private_data;
133
134 if (!select_ret || !pdd || !FD_ISSET(pdd->fd, rfds))
135 return 1; /* nothing to do */
136 if (rn->loaded >= DCCP_BUFSIZE)
137 return -E_DCCP_OVERRUN;
138 ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
139 DCCP_BUFSIZE - rn->loaded);
140 if (ret <= 0) {
141 PARA_INFO_LOG("%s\n", ret? PARA_STRERROR(-ret) : "eof");
142 return ret;
143 }
144 rn->loaded += ret;
145 return 1;
146 }
147
148 /**
149 * the init function of the dccp receiver
150 *
151 * \param r pointer to the receiver struct to initialize
152 *
153 * Initialize all function pointers of \a r
154 */
155 void dccp_recv_init(struct receiver *r)
156 {
157 r->shutdown = dccp_shutdown;
158 r->open = dccp_recv_open;
159 r->close = dccp_recv_close;
160 r->pre_select = dccp_recv_pre_select;
161 r->post_select = dccp_recv_post_select;
162 r->parse_config = dccp_recv_parse_config;
163 }