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code.delx.au - pulseaudio/blob - src/modules/rtp/sap.c
2 This file is part of PulseAudio.
4 Copyright 2006 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
27 #include <sys/types.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
33 #include <sys/ioctl.h>
35 #ifdef HAVE_SYS_FILIO_H
36 #include <sys/filio.h>
43 #include <pulse/xmalloc.h>
45 #include <pulsecore/core-error.h>
46 #include <pulsecore/core-util.h>
47 #include <pulsecore/log.h>
48 #include <pulsecore/macro.h>
49 #include <pulsecore/arpa-inet.h>
54 #define MIME_TYPE "application/sdp"
56 pa_sap_context
* pa_sap_context_init_send(pa_sap_context
*c
, int fd
, char *sdp_data
) {
62 c
->sdp_data
= sdp_data
;
63 c
->msg_id_hash
= (uint16_t) (rand()*rand());
68 void pa_sap_context_destroy(pa_sap_context
*c
) {
72 pa_xfree(c
->sdp_data
);
75 int pa_sap_send(pa_sap_context
*c
, bool goodbye
) {
77 struct sockaddr_storage sa_buf
;
78 struct sockaddr
*sa
= (struct sockaddr
*) &sa_buf
;
79 socklen_t salen
= sizeof(sa_buf
);
84 if (getsockname(c
->fd
, sa
, &salen
) < 0) {
85 pa_log("getsockname() failed: %s\n", pa_cstrerror(errno
));
90 pa_assert(sa
->sa_family
== AF_INET
|| sa
->sa_family
== AF_INET6
);
92 pa_assert(sa
->sa_family
== AF_INET
);
95 header
= htonl(((uint32_t) 1 << 29) |
97 (sa
->sa_family
== AF_INET6
? (uint32_t) 1 << 28 : 0) |
99 (goodbye
? (uint32_t) 1 << 26 : 0) |
102 iov
[0].iov_base
= &header
;
103 iov
[0].iov_len
= sizeof(header
);
105 if (sa
->sa_family
== AF_INET
) {
106 iov
[1].iov_base
= (void*) &((struct sockaddr_in
*) sa
)->sin_addr
;
110 iov
[1].iov_base
= (void*) &((struct sockaddr_in6
*) sa
)->sin6_addr
;
111 iov
[1].iov_len
= 16U;
115 iov
[2].iov_base
= (char*) MIME_TYPE
;
116 iov
[2].iov_len
= sizeof(MIME_TYPE
);
118 iov
[3].iov_base
= c
->sdp_data
;
119 iov
[3].iov_len
= strlen(c
->sdp_data
);
125 m
.msg_control
= NULL
;
126 m
.msg_controllen
= 0;
129 if ((k
= sendmsg(c
->fd
, &m
, MSG_DONTWAIT
)) < 0)
130 pa_log_warn("sendmsg() failed: %s\n", pa_cstrerror(errno
));
135 pa_sap_context
* pa_sap_context_init_recv(pa_sap_context
*c
, int fd
) {
144 int pa_sap_recv(pa_sap_context
*c
, bool *goodbye
) {
148 char *buf
= NULL
, *e
;
156 if (ioctl(c
->fd
, FIONREAD
, &size
) < 0) {
157 pa_log_warn("FIONREAD failed: %s", pa_cstrerror(errno
));
161 buf
= pa_xnew(char, (unsigned) size
+1);
165 iov
.iov_len
= (size_t) size
;
171 m
.msg_control
= NULL
;
172 m
.msg_controllen
= 0;
175 if ((r
= recvmsg(c
->fd
, &m
, 0)) != size
) {
176 pa_log_warn("recvmsg() failed: %s", r
< 0 ? pa_cstrerror(errno
) : "size mismatch");
181 pa_log_warn("SAP packet too short.");
185 memcpy(&header
, buf
, sizeof(uint32_t));
186 header
= ntohl(header
);
188 if (header
>> 29 != 1) {
189 pa_log_warn("Unsupported SAP version.");
193 if ((header
>> 25) & 1) {
194 pa_log_warn("Encrypted SAP not supported.");
198 if ((header
>> 24) & 1) {
199 pa_log_warn("Compressed SAP not supported.");
203 six
= (header
>> 28) & 1U;
204 ac
= (header
>> 16) & 0xFFU
;
206 k
= 4 + (six
? 16U : 4U) + ac
*4U;
207 if ((unsigned) size
< k
) {
208 pa_log_warn("SAP packet too short (AD).");
215 if ((unsigned) size
>= sizeof(MIME_TYPE
) && pa_streq(e
, MIME_TYPE
)) {
216 e
+= sizeof(MIME_TYPE
);
217 size
-= (int) sizeof(MIME_TYPE
);
218 } else if ((unsigned) size
< sizeof(PA_SDP_HEADER
)-1 || strncmp(e
, PA_SDP_HEADER
, sizeof(PA_SDP_HEADER
)-1)) {
219 pa_log_warn("Invalid SDP header.");
224 pa_xfree(c
->sdp_data
);
226 c
->sdp_data
= pa_xstrndup(e
, (unsigned) size
);
229 *goodbye
= !!((header
>> 26) & 1);