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/*
* sap.h: RFC2974 Session Announcement Protocol (SAP) version 2
*
* See the main source file 'xineliboutput.c' for copyright information and
* how to reach the author.
*
* $Id: sap.h,v 1.8 2007-03-29 14:22:30 phintuka Exp $
*
*/
#ifndef XINELIBOUTPUT_SAP_H_
#define XINELIBOUTPUT_SAP_H_
#include <arpa/inet.h>
#ifdef __APPLE__
# include <machine/endian.h>
#else
# include <endian.h>
#endif
#ifndef PACKED
# define PACKED __attribute__((packed))
#endif
/*#define LOG_SAP*/
/* SAP IPv4 multicast addresses */
#define SAP_IP_ADDRESS_GLOBAL "224.2.127.254" /* SAPv1 IP4 global scope multicast address */
#define SAP_IP_ADDRESS_ORG "239.195.255.255" /* organization-local */
#define SAP_IP_ADDRESS_LOCAL "239.255.255.255" /* local */
#define SAP_IP_ADDRESS_LINK "224.0.0.255" /* link-local */
#define SAP_IP_TTL 255
#define SAP_UDP_PORT 9875
typedef struct {
/* RFC2974: SAP (Session Announcement Protocol) version 2 PDU */
union {
uint8_t raw0;
struct {
#if __BYTE_ORDER == __BIG_ENDIAN
uint8_t version : 3;
uint8_t addr_type : 1;
uint8_t reserved : 1;
uint8_t msg_type : 1;
uint8_t encrypted : 1;
uint8_t compressed : 1;
#else
uint8_t compressed : 1;
uint8_t encrypted : 1;
uint8_t msg_type : 1;
uint8_t reserved : 1;
uint8_t addr_type : 1;
uint8_t version : 3;
#endif
} PACKED;
} PACKED;
uint8_t auth_len;
uint16_t msgid_hash;
union {
uint8_t u8[4];
uint32_t u32;
} PACKED ip4_source;
char payload[0];
} PACKED sap_pdu_t;
static inline sap_pdu_t *sap_create_pdu(uint32_t src_ip,
uint16_t msgid,
int announce,
const char *payload_type,
const char *payload)
{
sap_pdu_t *pdu;
int length = sizeof(sap_pdu_t) + strlen(payload) + 3;
if(payload_type)
length += strlen(payload_type);
if(! (pdu = (sap_pdu_t*)malloc(length)))
return NULL;
memset(pdu, 0, sizeof(sap_pdu_t));
pdu->version = 1; /* SAP v1 / v2 */
pdu->msg_type = announce ? 0 : 1;
pdu->msgid_hash = msgid;
pdu->ip4_source.u32 = src_ip;
if(payload_type) {
char *tmp = &pdu->payload[0];
strcpy(tmp, payload_type);
tmp += strlen(tmp) + 1;
strcpy(tmp, payload);
} else {
/* payload type defaults to application/sdp */
sprintf(&pdu->payload[0], "%s%c%c", payload, 0, 0);
}
return pdu;
}
static inline int sap_compress_pdu(sap_pdu_t *pdu)
{
#ifdef HAVE_ZLIB_H
/* zlib compression */
Compress();
/*pdu->compressed = 1;*/
#endif
/* not implemented */
pdu->compressed = 0;
return -1;
}
static inline int sap_send_pdu(int *pfd, sap_pdu_t *pdu, uint32_t dst_ip)
{
int len = 0, r;
int iReuse = 1, iLoop = 1, iTtl = SAP_IP_TTL;
int fd;
if(!pfd || *pfd < 0) {
fd = socket(AF_INET, SOCK_DGRAM, 0);
if(fd < 0) {
LOGERR("socket() failed (UDP/SAP multicast)");
return -1;
}
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &iReuse, sizeof(int));
setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &iTtl, sizeof(int));
setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &iLoop, sizeof(int));
// Connect to multicast address
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(SAP_UDP_PORT);
sin.sin_addr.s_addr = dst_ip ? dst_ip : inet_addr(SAP_IP_ADDRESS_GLOBAL);
if(connect(fd, (struct sockaddr *)&sin, sizeof(sin))==-1)
LOGERR("UDP/SAP multicast connect() failed.");
// Set to non-blocking mode
fcntl (fd, F_SETFL, fcntl (fd, F_GETFL) | O_NONBLOCK);
if(pfd)
*pfd = fd;
} else {
fd = *pfd;
}
// size of PDU
len += strlen(&pdu->payload[0]);
if(!strstr(&pdu->payload[0], "\r\n")) {
/* assume mime content type is present */
len += 1;
len += strlen(&pdu->payload[len]);
len += sizeof(sap_pdu_t);
}
// network order
pdu->msgid_hash = htons(pdu->msgid_hash);
// send
r = send(fd, pdu, len, 0);
if(r < 0)
LOGERR("UDP/SAP multicast send() failed.");
if(!pfd)
close(fd);
#ifdef LOG_SAP
/* log PDU */
for(int i=0; i<len;) {
char x[4096]="", a[4096]="";
for(int j=0; j<16 && i<len; i++, j++) {
char t[8], ch = ((char*)pdu)[i];
sprintf(t, "%02X ", ((unsigned int)ch)&0xff);
strcat(x, t);
sprintf(t, "%c", (ch>=32 && ch<127) ? ch : '.');
strcat(a, t);
}
LOGMSG("SAP: 0x%02x: %-50s%-18s", i/16-1, x, a);
}
#endif
// back to host order
pdu->msgid_hash = ntohs(pdu->msgid_hash);
return r == len ? len : -1;
}
#endif /* XINELIBOUTPUT_SAP_H_ */
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