summaryrefslogtreecommitdiff
path: root/src/gsmd/usock.c
blob: 925be759a35f2229d155e9b3f1491d739c2759b4 (plain)
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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include <sys/socket.h>
#include <sys/un.h>

#include <gsmd/gsmd.h>
#include <gsmd/usock.h>

#include "gsmd.h"
#include "select.h"
#include "atcmd.h"
#include "usock.h"

/* callback for completed passthrough gsmd_atcmd's */
static int usock_cmd_cb(struct gsmd_atcmd *cmd, void *ctx)
{
	struct gsmd_user *gu = ctx;
	struct gsmd_ucmd *ucmd = malloc(sizeof(*ucmd)+cmd->buflen);

	if (!ucmd)
		return -ENOMEM;
	
	ucmd->hdr.version = GSMD_PROTO_VERSION;
	ucmd->hdr.msg_type = GSMD_MSG_PASSTHROUGH;
	ucmd->hdr.msg_subtype = GSMD_PASSTHROUGH_RESP;
	ucmd->hdr.len = cmd->buflen;
	memcpy(ucmd->buf, cmd->buf, ucmd->hdr.len);

	/* add to per-user list of finished cmds */
	llist_add_tail(&ucmd->list, &gu->finished_ucmds);

	/* mark socket of user as we-want-to-write */
	gu->gfd.when |= GSMD_FD_WRITE;

	return 0;
}

typedef int usock_msg_handler(struct gsmd_user *gu, struct gsmd_msg_hdr *gph, int len);

static int usock_rcv_passthrough(struct gsmd_user *gu, struct gsmd_msg_hdr *gph, int len)
{
	struct gsmd_atcmd *cmd;
	cmd = atcmd_fill((char *)gph+sizeof(*gph), 255, &usock_cmd_cb, gu);
	if (!cmd)
		return -ENOMEM;

	return atcmd_submit(gu->gsmd, cmd);
}

static int usock_rcv_event(struct gsmd_user *gu, struct gsmd_msg_hdr *gph, int len)
{
	u_int32_t *evtmask = (u_int32_t *) ((char *)gph + sizeof(*gph));

	if (len < sizeof(*gph) + sizeof(u_int32_t))
		return -EINVAL;

	if (gph->msg_subtype != GSMD_EVENT_SUBSCRIPTIONS)
		return -EINVAL;

	gu->subscriptions = *evtmask;
}

static int usock_rcv_voicecall(struct gsmd_user *gu, struct gsmd_msg_hdr *gph, int len)
{
	struct gsmd_atcmd *cmd;

	switch (gph->msg_subtype) {
	case GSMD_VOICECALL_DIAL:
		/* FIXME */
		break;
	case GSMD_VOICECALL_HANGUP:
		cmd = atcmd_fill("ATH0", 5, &usock_cmd_cb, gu);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

#define GSMD_PIN_MAXLEN 16

static int usock_rcv_pin(struct gsmd_user *gu, struct gsmd_msg_hdr *gph, int len)
{
	u_int8_t *pin = (u_int8_t *)gph + sizeof(*gph);
	int pin_len = len - sizeof(*gph);
	char pinbuf[GSMD_PIN_MAXLEN + 11]; /* `AT+CPIN=""\0' */

	snprintf(pinbuf, sizeof(pinbuf), "AT+CPIN=\"%s\"", pin);

	switch (gph->msg_subtype) {
	case GSMD_PIN_INPUT:
		/* FIXME */
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static usock_msg_handler *pcmd_type_handlers[] = {
	[GSMD_MSG_PASSTHROUGH]	= &usock_rcv_passthrough,
	[GSMD_MSG_EVENT]	= &usock_rcv_event,
	[GSMD_MSG_VOICECALL]	= &usock_rcv_voicecall,
	[GSMD_MSG_PIN]		= &usock_rcv_pin,
};

static int usock_rcv_pcmd(struct gsmd_user *gu, char *buf, int len)
{
	struct gsmd_msg_hdr *gph = (struct gsmd_msg_hdr *)buf;
	usock_msg_handler *umh;

	if (gph->version != GSMD_PROTO_VERSION)
		return -EINVAL;

	if (gph->msg_type >= ARRAY_SIZE(pcmd_type_handlers))
		return -EINVAL;
	
	umh = pcmd_type_handlers[gph->msg_type];
	if (!umh)
		return -EINVAL;

	return umh(gu, gph, len);
}

/* callback for read/write on client (libgsmd) socket */
static int gsmd_usock_user_cb(int fd, unsigned int what, void *data)
{
	struct gsmd_user *gu = data;

	/* FIXME: check some kind of backlog and limit it */

	if (what & GSMD_FD_READ) {
		char buf[1024];
		int rcvlen;
		/* read data from socket, determine what he wants */
		rcvlen = read(fd, buf, sizeof(buf));
		if (rcvlen == 0) {
			/* EOF, this client has just vanished */
			gsmd_unregister_fd(&gu->gfd);
			close(fd);
			/* destroy whole user structure */
			llist_del(&gu->list);
			/* FIXME: delete budy ucmds from finished_ucmds */
			return 0;
		} else if (rcvlen < 0)
			return rcvlen;
		else
			return usock_rcv_pcmd(gu, buf, rcvlen);
	}

	if (what & GSMD_FD_WRITE) {
		/* write data from pending replies to socket */
		struct gsmd_ucmd *ucmd, *uctmp;
		llist_for_each_entry_safe(ucmd, uctmp, &gu->finished_ucmds,
					  list) {
			int rc;

			rc = write(fd, &ucmd->hdr, sizeof(ucmd->hdr) + ucmd->hdr.len);
			if (rc < 0) {
				DEBUGP("write return %d\n", rc);
				return rc;
			}
			if (rc == 0) {
				DEBUGP("write returns zero!!\n");
				break;
			}
			if (rc != sizeof(ucmd->hdr) + ucmd->hdr.len) {
				DEBUGP("short write\n");
				break;
			}

			llist_del(&ucmd->list);
			free(ucmd);
		}
	}

	return 0;
}

/* callback for read on master-listen-socket */
static int gsmd_usock_cb(int fd, unsigned int what, void *data)
{
	struct gsmd *g = data;
	struct gsmd_user *newuser;

	/* FIXME: implement this */
	if (what & GSMD_FD_READ) {
		/* new incoming connection */
		newuser = malloc(sizeof(*newuser));
		if (!newuser)
			return -ENOMEM;
		
		newuser->gfd.fd = accept(fd, NULL, 0);
		if (newuser->gfd.fd < 0) {
			DEBUGP("error accepting incoming conn: `%s'\n",
				strerror(errno));
			free(newuser);
		}
		newuser->gfd.when = GSMD_FD_READ;
		newuser->gfd.data = newuser;
		newuser->gfd.cb = &gsmd_usock_user_cb;
		newuser->gsmd = g;

		llist_add(&newuser->list, &g->users);
		gsmd_register_fd(&newuser->gfd);
	}

	return 0;
}

/* handling of socket with incoming client connections */
int usock_init(struct gsmd *g)
{
	struct sockaddr_un sun;
	int fd, rc;

	fd = socket(PF_UNIX, GSMD_UNIX_SOCKET_TYPE, 0);
	if (fd < 0)
		return fd;
	
	memset(&sun, 0, sizeof(sun));
	sun.sun_family = AF_UNIX;
	memcpy(sun.sun_path, GSMD_UNIX_SOCKET, sizeof(GSMD_UNIX_SOCKET));

	rc = bind(fd, (struct sockaddr *)&sun, sizeof(sun));
	if (rc < 0) {
		close(fd);
		return rc;
	}

	rc = listen(fd, 10);
	if (rc < 0) {
		close(fd);
		return rc;
	}

	g->gfd_sock.fd = fd;
	g->gfd_sock.when = GSMD_FD_READ | GSMD_FD_EXCEPT;
	g->gfd_sock.data = g;
	g->gfd_sock.cb = &gsmd_usock_cb;

	return gsmd_register_fd(&g->gfd_sock);
}
personal git repositories of Harald Welte. Your mileage may vary