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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/* libgsmd core
*
* (C) 2006-2007 by OpenMoko, Inc.
* Written by Harald Welte <laforge@openmoko.org>
* All Rights Reserved
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <gsmd/usock.h>
#include <libgsmd/libgsmd.h>
#include "lgsm_internals.h"
static int lgsm_get_packet(struct lgsm_handle *lh)
{
static char buf[GSMD_MSGSIZE_MAX];
struct gsmd_msg_hdr *hdr = (struct gsmd_msg_hdr *) buf;
int rc = read(lh->fd, buf, sizeof(buf));
if (rc <= 0)
return rc;
if (hdr->version != GSMD_PROTO_VERSION)
return -EINVAL;
switch (hdr->msg_type) {
case GSMD_MSG_PASSTHROUGH:
break;
default:
return -EINVAL;
}
return 0;
}
static int lgsm_open_backend(struct lgsm_handle *lh, const char *device)
{
int rc;
if (!strcmp(device, LGSMD_DEVICE_GSMD)) {
struct sockaddr_un sun;
/* use unix domain socket to gsm daemon */
lh->fd = socket(PF_UNIX, GSMD_UNIX_SOCKET_TYPE, 0);
if (lh->fd < 0)
return lh->fd;
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
memcpy(sun.sun_path, GSMD_UNIX_SOCKET, sizeof(GSMD_UNIX_SOCKET));
rc = connect(lh->fd, (struct sockaddr *)&sun, sizeof(sun));
if (rc < 0) {
close(lh->fd);
lh->fd = -1;
return rc;
}
} else
return -EINVAL;
return 0;
}
/* handle a packet that was received on the gsmd socket */
int lgsm_handle_packet(struct lgsm_handle *lh, char *buf, int len)
{
struct gsmd_msg_hdr *gmh;
lgsm_msg_handler *handler;
int rc = 0;
while (len) {
if (len < sizeof(*gmh))
return -EINVAL;
gmh = (struct gsmd_msg_hdr *) buf;
if (len - sizeof(*gmh) < gmh->len)
return -EINVAL;
len -= sizeof(*gmh) + gmh->len;
buf += sizeof(*gmh) + gmh->len;
if (gmh->msg_type >= __NUM_GSMD_MSGS)
return -EINVAL;
handler = lh->handler[gmh->msg_type];
if (handler)
rc |= handler(lh, gmh);
else
fprintf(stderr, "unable to handle packet type=%u\n",
gmh->msg_type);
}
return rc;
}
int lgsm_register_handler(struct lgsm_handle *lh, int type, lgsm_msg_handler *handler)
{
if (type >= __NUM_GSMD_MSGS)
return -EINVAL;
lh->handler[type] = handler;
return 0;
}
void lgsm_unregister_handler(struct lgsm_handle *lh, int type)
{
if (type < __NUM_GSMD_MSGS)
lh->handler[type] = NULL;
}
/* blocking read and processing of packets until packet matching 'id' is found */
int lgsm_blocking_wait_packet(struct lgsm_handle *lh, u_int16_t id,
struct gsmd_msg_hdr *gmh, int rlen)
{
int rc;
fd_set readset;
FD_ZERO(&readset);
while (1) {
FD_SET(lh->fd, &readset);
rc = select(lh->fd+1, &readset, NULL, NULL, NULL);
if (rc <= 0)
return rc;
rc = read(lh->fd, (char *)gmh, rlen);
if (rc <= 0)
return rc;
if (gmh->id == id) {
/* we've found the matching packet, return to calling function */
return rc;
} else
rc = lgsm_handle_packet(lh, (char *)gmh, rc);
}
}
int lgsm_fd(struct lgsm_handle *lh)
{
return lh->fd;
}
struct lgsm_handle *lgsm_init(const char *device)
{
struct lgsm_handle *lh = malloc(sizeof(*lh));
memset(lh, 0, sizeof(*lh));
lh->fd = -1;
if (lgsm_open_backend(lh, device) < 0) {
free(lh);
return NULL;
}
lgsm_evt_init(lh);
return lh;
}
int lgsm_exit(struct lgsm_handle *lh)
{
free(lh);
return 0;
}
static u_int16_t next_msg_id;
int lgsm_send(struct lgsm_handle *lh, struct gsmd_msg_hdr *gmh)
{
gmh->id = next_msg_id++;
return send(lh->fd, (char *) gmh, sizeof(*gmh) + gmh->len, 0);
}
struct gsmd_msg_hdr *lgsm_gmh_fill(int type, int subtype, int payload_len)
{
struct gsmd_msg_hdr *gmh = malloc(sizeof(*gmh)+payload_len);
if (!gmh)
return NULL;
memset(gmh, 0, sizeof(*gmh)+payload_len);
gmh->version = GSMD_PROTO_VERSION;
gmh->msg_type = type;
gmh->msg_subtype = subtype;
gmh->len = payload_len;
return gmh;
}
int lgsm_send_simple(struct lgsm_handle *lh, int type, int sub_type)
{
struct gsmd_msg_hdr *gmh;
int rc;
gmh = lgsm_gmh_fill(type, sub_type, 0);
if (!gmh)
return -ENOMEM;
rc = lgsm_send(lh, gmh);
lgsm_gmh_free(gmh);
return rc;
}
|
