1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* The Common Application Connection Establishment Protocol
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <ouroboros/config.h>
#include <ouroboros/cacep.h>
#include <ouroboros/dev.h>
#include <ouroboros/errno.h>
#include <stdlib.h>
#include <string.h>
#include "cacep.pb-c.h"
typedef CacepMsg cacep_msg_t;
#define BUF_SIZE 64
int read_msg(int fd,
struct conn_info * info)
{
uint8_t buf[BUF_SIZE];
cacep_msg_t * msg;
ssize_t len;
len = flow_read(fd, buf, BUF_SIZE);
if (len < 0)
return -1;
msg = cacep_msg__unpack(NULL, len, buf);
if (msg == NULL)
return -1;
strcpy(info->protocol, msg->protocol);
info->pref_version = msg->pref_version;
info->pref_syntax = msg->pref_syntax;
cacep_msg__free_unpacked(msg, NULL);
return 0;
}
static int send_msg(int fd,
const struct conn_info * info)
{
cacep_msg_t msg = CACEP_MSG__INIT;
uint8_t * data = NULL;
size_t len = 0;
msg.ae_name = (char *) info->ae_name;
msg.protocol = (char *) info->protocol;
msg.pref_version = info->pref_version;
msg.pref_syntax = info->pref_syntax;
if (msg.pref_syntax < 0)
return -1;
len = cacep_msg__get_packed_size(&msg);
if (len == 0)
return -1;
data = malloc(len);
if (data == NULL)
return -ENOMEM;
cacep_msg__pack(&msg, data);
if (flow_write(fd, data, len) < 0) {
free(data);
return -1;
}
free(data);
return 0;
}
int cacep_connect(int fd,
const struct conn_info * in,
struct conn_info * out)
{
if (in == NULL || out == NULL)
return -EINVAL;
if (send_msg(fd, in))
return -1;
if (read_msg(fd, out))
return -1;
if (strcmp(in->ae_name, out->ae_name) ||
strcmp(in->protocol, out->protocol) ||
in->pref_version != out->pref_version ||
in->pref_syntax != out->pref_syntax)
return -EPROTO;
return 0;
}
int cacep_listen(int fd,
const struct conn_info * in,
struct conn_info * out)
{
if (in == NULL || out == NULL)
return -EINVAL;
if (send_msg(fd, in))
return -1;
if (read_msg(fd, out))
return -1;
if (strcmp(in->ae_name, out->ae_name) ||
strcmp(in->protocol, out->protocol) ||
in->pref_version != out->pref_version ||
in->pref_syntax != out->pref_syntax)
return -EPROTO;
return 0;
}
|
