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
|
/* $Id$ */
/***
This file is part of polypaudio.
polypaudio 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 of the License,
or (at your option) any later version.
polypaudio 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.
You should have received a copy of the GNU Lesser General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <time.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#include <polyp/xmalloc.h>
#include <polypcore/core-error.h>
#include <polypcore/core-util.h>
#include <polypcore/log.h>
#include "sap.h"
#include "sdp.h"
#define MIME_TYPE "application/sdp"
pa_sap_context* pa_sap_context_init_send(pa_sap_context *c, int fd, char *sdp_data) {
assert(c);
assert(fd >= 0);
assert(sdp_data);
c->fd = fd;
c->sdp_data = sdp_data;
c->msg_id_hash = (uint16_t) (rand()*rand());
return c;
}
void pa_sap_context_destroy(pa_sap_context *c) {
assert(c);
close(c->fd);
pa_xfree(c->sdp_data);
}
int pa_sap_send(pa_sap_context *c, int goodbye) {
uint32_t header;
struct sockaddr_storage sa_buf;
struct sockaddr *sa = (struct sockaddr*) &sa_buf;
socklen_t salen = sizeof(sa_buf);
struct iovec iov[4];
struct msghdr m;
int k;
if (getsockname(c->fd, sa, &salen) < 0) {
pa_log("getsockname() failed: %s\n", pa_cstrerror(errno));
return -1;
}
assert(sa->sa_family == AF_INET || sa->sa_family == AF_INET6);
header = htonl(((uint32_t) 1 << 29) |
(sa->sa_family == AF_INET6 ? (uint32_t) 1 << 28 : 0) |
(goodbye ? (uint32_t) 1 << 26 : 0) |
(c->msg_id_hash));
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
iov[1].iov_base = sa->sa_family == AF_INET ? (void*) &((struct sockaddr_in*) sa)->sin_addr : (void*) &((struct sockaddr_in6*) sa)->sin6_addr;
iov[1].iov_len = sa->sa_family == AF_INET ? 4 : 16;
iov[2].iov_base = (char*) MIME_TYPE;
iov[2].iov_len = sizeof(MIME_TYPE);
iov[3].iov_base = c->sdp_data;
iov[3].iov_len = strlen(c->sdp_data);
m.msg_name = NULL;
m.msg_namelen = 0;
m.msg_iov = iov;
m.msg_iovlen = 4;
m.msg_control = NULL;
m.msg_controllen = 0;
m.msg_flags = 0;
if ((k = sendmsg(c->fd, &m, MSG_DONTWAIT)) < 0)
pa_log("sendmsg() failed: %s\n", pa_cstrerror(errno));
return k;
}
pa_sap_context* pa_sap_context_init_recv(pa_sap_context *c, int fd) {
assert(c);
assert(fd >= 0);
c->fd = fd;
c->sdp_data = NULL;
return c;
}
int pa_sap_recv(pa_sap_context *c, int *goodbye) {
struct msghdr m;
struct iovec iov;
int size, k;
char *buf = NULL, *e;
uint32_t header;
int six, ac;
ssize_t r;
assert(c);
assert(goodbye);
if (ioctl(c->fd, FIONREAD, &size) < 0) {
pa_log(__FILE__": FIONREAD failed: %s", pa_cstrerror(errno));
goto fail;
}
if (!size)
return 0;
buf = pa_xnew(char, size+1);
buf[size] = 0;
iov.iov_base = buf;
iov.iov_len = size;
m.msg_name = NULL;
m.msg_namelen = 0;
m.msg_iov = &iov;
m.msg_iovlen = 1;
m.msg_control = NULL;
m.msg_controllen = 0;
m.msg_flags = 0;
if ((r = recvmsg(c->fd, &m, 0)) != size) {
pa_log(__FILE__": recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
goto fail;
}
if (size < 4) {
pa_log(__FILE__": SAP packet too short.");
goto fail;
}
memcpy(&header, buf, sizeof(uint32_t));
header = ntohl(header);
if (header >> 29 != 1) {
pa_log(__FILE__": Unsupported SAP version.");
goto fail;
}
if ((header >> 25) & 1) {
pa_log(__FILE__": Encrypted SAP not supported.");
goto fail;
}
if ((header >> 24) & 1) {
pa_log(__FILE__": Compressed SAP not supported.");
goto fail;
}
six = (header >> 28) & 1;
ac = (header >> 16) & 0xFF;
k = 4 + (six ? 16 : 4) + ac*4;
if (size < k) {
pa_log(__FILE__": SAP packet too short (AD).");
goto fail;
}
e = buf + k;
size -= k;
if ((unsigned) size >= sizeof(MIME_TYPE) && !strcmp(e, MIME_TYPE)) {
e += sizeof(MIME_TYPE);
size -= sizeof(MIME_TYPE);
} else if ((unsigned) size < sizeof(PA_SDP_HEADER)-1 || strncmp(e, PA_SDP_HEADER, sizeof(PA_SDP_HEADER)-1)) {
pa_log(__FILE__": Invalid SDP header.");
goto fail;
}
if (c->sdp_data)
pa_xfree(c->sdp_data);
c->sdp_data = pa_xstrndup(e, size);
pa_xfree(buf);
*goodbye = !!((header >> 26) & 1);
return 0;
fail:
pa_xfree(buf);
return -1;
}
|
