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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program 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 General Public License for more details.
*/
#include "android_modem.h"
#include "sysdeps.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#define DEFAULT_PORT 6703
static AModem modem;
typedef struct {
SysChannel channel;
char in_buff[ 128 ];
int in_pos;
char out_buff[ 128 ];
int out_pos;
int out_size;
} ClientRec, *Client;
static Client
client_alloc( SysChannel channel )
{
Client client = calloc( sizeof(*client), 1 );
client->channel = channel;
return client;
}
static void
client_free( Client client )
{
sys_channel_close( client->channel );
client->channel = NULL;
free( client );
}
static void
client_append( Client client, const char* str, int len );
static void
dump_line( const char* line, const char* prefix )
{
if (prefix)
printf( "%s", prefix );
for ( ; *line; line++ ) {
int c = line[0];
if (c >= 32 && c < 127)
printf( "%c", c );
else if (c == '\r')
printf( "<CR>" );
else if (c == '\n')
printf( "<LF>" );
else
printf( "\\x%02x", c );
}
printf( "\n" );
}
static void
client_handle_line( Client client, const char* cmd )
{
const char* answer;
dump_line( cmd, "<< " );
answer = amodem_send( modem, cmd );
if (answer == NULL) /* not an AT command, ignored */ {
printf( "-- NO ANSWER\n" );
return;
}
dump_line( answer, ">> " );
client_append( client, answer, -1 );
client_append( client, "\r", 1 );
}
static void
client_handler( void* _client, int events )
{
Client client = _client;
if (events & SYS_EVENT_READ) {
int ret;
/* read into buffer, one character at a time */
ret = sys_channel_read( client->channel, client->in_buff + client->in_pos, 1 );
if (ret != 1) {
fprintf(stderr, "client %p could not read byte, result = %d, error: %s\n",
client, ret, strerror(errno) );
goto ExitClient;
}
if (client->in_buff[client->in_pos] == '\r' ||
client->in_buff[client->in_pos] == '\n' ) {
const char* cmd = client->in_buff;
client->in_buff[client->in_pos] = 0;
if (client->in_pos > 0) {
client_handle_line( client, cmd );
client->in_pos = 0;
}
} else
client->in_pos += 1;
}
if (events & SYS_EVENT_WRITE) {
int ret;
/* write from output buffer, one char at a time */
ret = sys_channel_write( client->channel, client->out_buff + client->out_pos, 1 );
if (ret != 1) {
fprintf(stderr, "client %p could not write byte, result = %d, error: %s\n",
client, ret, strerror(errno) );
goto ExitClient;
}
client->out_pos += 1;
if (client->out_pos == client->out_size) {
client->out_size = 0;
client->out_pos = 0;
/* we don't need to write */
sys_channel_on( client->channel, SYS_EVENT_READ, client_handler, client );
}
}
return;
ExitClient:
printf( "client %p exiting\n", client );
client_free( client );
}
static void
client_append( Client client, const char* str, int len )
{
int avail;
if (len < 0)
len = strlen(str);
avail = sizeof(client->out_buff) - client->out_size;
if (len > avail)
len = avail;
memcpy( client->out_buff + client->out_size, str, len );
if (client->out_size == 0) {
sys_channel_on( client->channel, SYS_EVENT_READ | SYS_EVENT_WRITE, client_handler, client );
}
client->out_size += len;
}
static void
accept_func( void* _server, int events )
{
SysChannel server = _server;
SysChannel handler;
Client client;
printf( "connection accepted for server channel, getting handler socket\n" );
handler = sys_channel_create_tcp_handler( server );
client = client_alloc( handler );
printf( "got one. created client %p\n", client );
events=events;
sys_channel_on( handler, SYS_EVENT_READ, client_handler, client );
}
int main( void )
{
int port = DEFAULT_PORT;
SysChannel server;
sys_main_init();
modem = amodem_create( NULL, NULL );
server = sys_channel_create_tcp_server( port );
printf( "GSM simulator listening on local port %d\n", port );
sys_channel_on( server, SYS_EVENT_READ, accept_func, server );
sys_main_loop();
printf( "GSM simulator exiting\n" );
return 0;
}
|
