fix potential segfault in para_client
[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 /** \file dccp_recv.c paraslash's dccp receiver */
20
21 /*
22 * based on client.c of dccp-cs-0.01.tar.bz2,
23 * (C) 2005 Ian McDonald <imcdnzl@gmail.com>
24 */
25
26 #include "para.h"
27 #include "error.h"
28 #include "dccp.h"
29 #include "recv.h"
30 #include "string.h"
31 #include "net.h"
32
33 #include "dccp_recv.cmdline.h"
34
35 /* needed by getaddrinfo */
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <netdb.h>
39
40 /** the size of the output buffer */
41 #define DCCP_BUFSIZE 40960
42
43 /**
44 * data specific to the dccp receiver
45 *
46 * \sa receiver receiver_node
47 */
48 struct private_dccp_recv_data {
49 /** the file descriptor for the dccp socket */
50 int fd;
51 };
52
53
54 static void dccp_recv_close(struct receiver_node *rn)
55 {
56
57 struct private_dccp_recv_data *pdd = rn->private_data;
58
59 if (pdd && pdd->fd > 0)
60 close(pdd->fd);
61 free(rn->buf);
62 rn->buf = NULL;
63 free(rn->private_data);
64 rn->private_data = NULL;
65 }
66
67
68 static int dccp_recv_open(struct receiver_node *rn)
69 {
70 struct private_dccp_recv_data *pdd;
71 struct dccp_recv_args_info *conf = rn->conf;
72 int ret;
73 struct addrinfo *ai;
74 char *tmp;
75
76 rn->buf = para_calloc(DCCP_BUFSIZE);
77 rn->private_data = para_calloc(sizeof(struct private_dccp_recv_data));
78 pdd = rn->private_data;
79 ret = dccp_get_socket();
80 if (ret < 0)
81 goto err_out;
82 pdd->fd = ret;
83
84 tmp = make_message("%d", conf->port_arg);
85 ret = getaddrinfo(conf->host_arg, tmp, NULL, &ai);
86 free(tmp);
87 if (ret) {
88 ret = -E_ADDR_INFO;
89 goto err_out;
90 }
91 ret = dccp_set_socket(pdd->fd);
92 if (ret < 0)
93 goto err_out;
94 PARA_NOTICE_LOG("connecting to %s:%d\n", conf->host_arg, conf->port_arg);
95 ret = -E_DCCP_CONNECT;
96 if (connect(pdd->fd, ai->ai_addr, ai->ai_addrlen) < 0)
97 goto err_out;
98 return 1;
99 err_out:
100 dccp_recv_close(rn);
101 return ret;
102 }
103
104 static void dccp_shutdown(void)
105 {
106 ; /* nothing to do */
107 }
108
109 static void *dccp_recv_parse_config(int argc, char **argv)
110 {
111 struct dccp_recv_args_info *tmp = para_calloc(sizeof(struct dccp_recv_args_info));
112
113 if (!dccp_recv_cmdline_parser(argc, argv, tmp))
114 return tmp;
115 free(tmp);
116 return NULL;
117 }
118
119 static int dccp_recv_pre_select(struct receiver_node *rn, fd_set *rfds,
120 __unused fd_set *wfds, __unused struct timeval *timeout)
121 {
122 struct private_dccp_recv_data *pdd = rn->private_data;
123
124 if (!pdd)
125 return -1;
126 FD_SET(pdd->fd, rfds);
127 return pdd->fd;
128 }
129
130 static int dccp_recv_post_select(struct receiver_node *rn, int select_ret,
131 fd_set *rfds, __unused fd_set *wfds)
132 {
133 int ret;
134 struct private_dccp_recv_data *pdd = rn->private_data;
135
136 if (!select_ret || !pdd || !FD_ISSET(pdd->fd, rfds))
137 return 1; /* nothing to do */
138 if (rn->loaded >= DCCP_BUFSIZE)
139 return -E_DCCP_OVERRUN;
140 ret = recv_bin_buffer(pdd->fd, rn->buf + rn->loaded,
141 DCCP_BUFSIZE - rn->loaded);
142 if (ret <= 0) {
143 PARA_INFO_LOG("%s\n", ret? PARA_STRERROR(-ret) : "eof");
144 return ret;
145 }
146 rn->loaded += ret;
147 return 1;
148 }
149
150 /**
151 * the init function of the dccp receiver
152 *
153 * \param r pointer to the receiver struct to initialize
154 *
155 * Initialize all function pointers of \a r
156 */
157 void dccp_recv_init(struct receiver *r)
158 {
159 r->shutdown = dccp_shutdown;
160 r->open = dccp_recv_open;
161 r->close = dccp_recv_close;
162 r->pre_select = dccp_recv_pre_select;
163 r->post_select = dccp_recv_post_select;
164 r->parse_config = dccp_recv_parse_config;
165 }