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code.delx.au - pulseaudio/blob - src/modules/rtp/sap.c
82421807248e1beff947fc905ffa7f76f4bff3f6
4 This file is part of PulseAudio.
6 Copyright 2006 Lennart Poettering
8 PulseAudio is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published
10 by the Free Software Foundation; either version 2 of the License,
11 or (at your option) any later version.
13 PulseAudio is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with PulseAudio; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <netinet/in.h>
34 #include <arpa/inet.h>
38 #include <sys/ioctl.h>
40 #ifdef HAVE_SYS_FILIO_H
41 #include <sys/filio.h>
44 #include <pulse/xmalloc.h>
46 #include <pulsecore/core-error.h>
47 #include <pulsecore/core-util.h>
48 #include <pulsecore/log.h>
53 #define MIME_TYPE "application/sdp"
55 pa_sap_context
* pa_sap_context_init_send(pa_sap_context
*c
, int fd
, char *sdp_data
) {
61 c
->sdp_data
= sdp_data
;
62 c
->msg_id_hash
= (uint16_t) (rand()*rand());
67 void pa_sap_context_destroy(pa_sap_context
*c
) {
71 pa_xfree(c
->sdp_data
);
74 int pa_sap_send(pa_sap_context
*c
, int goodbye
) {
76 struct sockaddr_storage sa_buf
;
77 struct sockaddr
*sa
= (struct sockaddr
*) &sa_buf
;
78 socklen_t salen
= sizeof(sa_buf
);
83 if (getsockname(c
->fd
, sa
, &salen
) < 0) {
84 pa_log("getsockname() failed: %s\n", pa_cstrerror(errno
));
88 assert(sa
->sa_family
== AF_INET
|| sa
->sa_family
== AF_INET6
);
90 header
= htonl(((uint32_t) 1 << 29) |
91 (sa
->sa_family
== AF_INET6
? (uint32_t) 1 << 28 : 0) |
92 (goodbye
? (uint32_t) 1 << 26 : 0) |
95 iov
[0].iov_base
= &header
;
96 iov
[0].iov_len
= sizeof(header
);
98 iov
[1].iov_base
= sa
->sa_family
== AF_INET
? (void*) &((struct sockaddr_in
*) sa
)->sin_addr
: (void*) &((struct sockaddr_in6
*) sa
)->sin6_addr
;
99 iov
[1].iov_len
= sa
->sa_family
== AF_INET
? 4 : 16;
101 iov
[2].iov_base
= (char*) MIME_TYPE
;
102 iov
[2].iov_len
= sizeof(MIME_TYPE
);
104 iov
[3].iov_base
= c
->sdp_data
;
105 iov
[3].iov_len
= strlen(c
->sdp_data
);
111 m
.msg_control
= NULL
;
112 m
.msg_controllen
= 0;
115 if ((k
= sendmsg(c
->fd
, &m
, MSG_DONTWAIT
)) < 0)
116 pa_log("sendmsg() failed: %s\n", pa_cstrerror(errno
));
121 pa_sap_context
* pa_sap_context_init_recv(pa_sap_context
*c
, int fd
) {
130 int pa_sap_recv(pa_sap_context
*c
, int *goodbye
) {
134 char *buf
= NULL
, *e
;
142 if (ioctl(c
->fd
, FIONREAD
, &size
) < 0) {
143 pa_log("FIONREAD failed: %s", pa_cstrerror(errno
));
147 buf
= pa_xnew(char, size
+1);
157 m
.msg_control
= NULL
;
158 m
.msg_controllen
= 0;
161 if ((r
= recvmsg(c
->fd
, &m
, 0)) != size
) {
162 pa_log("recvmsg() failed: %s", r
< 0 ? pa_cstrerror(errno
) : "size mismatch");
167 pa_log("SAP packet too short.");
171 memcpy(&header
, buf
, sizeof(uint32_t));
172 header
= ntohl(header
);
174 if (header
>> 29 != 1) {
175 pa_log("Unsupported SAP version.");
179 if ((header
>> 25) & 1) {
180 pa_log("Encrypted SAP not supported.");
184 if ((header
>> 24) & 1) {
185 pa_log("Compressed SAP not supported.");
189 six
= (header
>> 28) & 1;
190 ac
= (header
>> 16) & 0xFF;
192 k
= 4 + (six
? 16 : 4) + ac
*4;
194 pa_log("SAP packet too short (AD).");
201 if ((unsigned) size
>= sizeof(MIME_TYPE
) && !strcmp(e
, MIME_TYPE
)) {
202 e
+= sizeof(MIME_TYPE
);
203 size
-= sizeof(MIME_TYPE
);
204 } else if ((unsigned) size
< sizeof(PA_SDP_HEADER
)-1 || strncmp(e
, PA_SDP_HEADER
, sizeof(PA_SDP_HEADER
)-1)) {
205 pa_log("Invalid SDP header.");
210 pa_xfree(c
->sdp_data
);
212 c
->sdp_data
= pa_xstrndup(e
, size
);
215 *goodbye
= !!((header
>> 26) & 1);