freebsd-dev/sys/netinet/ip_raudio_pxy.c

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/*
* $Id$
* $FreeBSD$
*/
#if SOLARIS && defined(_KERNEL)
extern kmutex_t ipf_rw;
#endif
#define IPF_RAUDIO_PROXY
int ippr_raudio_init __P((void));
int ippr_raudio_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
int ippr_raudio_in __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
int ippr_raudio_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
static frentry_t raudiofr;
/*
* Real Audio application proxy initialization.
*/
int ippr_raudio_init()
{
bzero((char *)&raudiofr, sizeof(raudiofr));
raudiofr.fr_ref = 1;
raudiofr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
return 0;
}
/*
* Setup for a new proxy to handle Real Audio.
*/
int ippr_raudio_new(fin, ip, aps, nat)
fr_info_t *fin;
ip_t *ip;
ap_session_t *aps;
nat_t *nat;
{
raudio_t *rap;
KMALLOCS(aps->aps_data, void *, sizeof(raudio_t));
if (aps->aps_data != NULL) {
bzero(aps->aps_data, sizeof(raudio_t));
rap = aps->aps_data;
aps->aps_psiz = sizeof(raudio_t);
rap->rap_mode = RAP_M_TCP; /* default is for TCP */
}
return 0;
}
int ippr_raudio_out(fin, ip, aps, nat)
fr_info_t *fin;
ip_t *ip;
ap_session_t *aps;
nat_t *nat;
{
char membuf[512 + 1], *s;
int off, dlen, inc = 0;
tcphdr_t *tcp, tcph, *tcp2 = &tcph;
raudio_t *rap = aps->aps_data;
u_short sp, dp, id = 0;
struct in_addr swip;
fr_info_t fi;
int len = 0;
nat_t *ipn;
mb_t *m;
#if SOLARIS
mb_t *m1;
#endif
/*
* If we've already processed the start messages, then nothing left
* for the proxy to do.
*/
if (rap->rap_eos == 1)
return 0;
tcp = (tcphdr_t *)fin->fin_dp;
off = (ip->ip_hl << 2) + (tcp->th_off << 2);
bzero(membuf, sizeof(membuf));
#if SOLARIS
m = fin->fin_qfm;
dlen = msgdsize(m) - off;
if (dlen <= 0)
return 0;
copyout_mblk(m, off, MIN(sizeof(membuf), dlen), membuf);
#else
m = *(mb_t **)fin->fin_mp;
dlen = mbufchainlen(m) - off;
if (dlen <= 0)
return 0;
m_copydata(m, off, MIN(sizeof(membuf), dlen), membuf);
#endif
/*
* In all the startup parsing, ensure that we don't go outside
* the packet buffer boundary.
*/
/*
* Look for the start of connection "PNA" string if not seen yet.
*/
if (rap->rap_seenpna == 0) {
s = memstr("PNA", membuf, 3, dlen);
if (s == NULL)
return 0;
s += 3;
rap->rap_seenpna = 1;
} else
s = membuf;
/*
* Directly after the PNA will be the version number of this
* connection.
*/
if (rap->rap_seenpna == 1 && rap->rap_seenver == 0) {
if ((s + 1) - membuf < dlen) {
rap->rap_version = (*s << 8) | *(s + 1);
s += 2;
rap->rap_seenver = 1;
} else
return 0;
}
/*
* Now that we've been past the PNA and version number, we're into the
* startup messages block. This ends when a message with an ID of 0.
*/
while ((rap->rap_eos == 0) && ((s + 1) - membuf < dlen)) {
if (rap->rap_gotid == 0) {
id = (*s << 8) | *(s + 1);
s += 2;
rap->rap_gotid = 1;
if (id == RA_ID_END) {
rap->rap_eos = 1;
break;
}
} else if (rap->rap_gotlen == 0) {
len = (*s << 8) | *(s + 1);
s += 2;
rap->rap_gotlen = 1;
}
if (rap->rap_gotid == 1 && rap->rap_gotlen == 1) {
if (id == RA_ID_UDP) {
rap->rap_mode &= ~RAP_M_TCP;
rap->rap_mode |= RAP_M_UDP;
rap->rap_plport = (*s << 8) | *(s + 1);
} else if (id == RA_ID_ROBUST) {
rap->rap_mode |= RAP_M_ROBUST;
rap->rap_prport = (*s << 8) | *(s + 1);
}
s += len;
rap->rap_gotlen = 0;
rap->rap_gotid = 0;
}
}
/*
* Wait until we've seen the end of the start messages and even then
* only proceed further if we're using UDP.
*/
if ((rap->rap_eos == 0) || ((rap->rap_mode & RAP_M_UDP) != RAP_M_UDP))
return 0;
sp = rap->rap_plport;
dp = 0;
bcopy((char *)fin, (char *)&fi, sizeof(fi));
bzero((char *)tcp2, sizeof(*tcp2));
tcp2->th_sport = htons(sp);
tcp2->th_dport = 0; /* XXX - don't specify remote port */
tcp2->th_win = htons(8192);
fi.fin_dp = (char *)tcp2;
fi.fin_data[0] = sp;
fi.fin_data[1] = 0;
fi.fin_fr = &raudiofr;
swip = ip->ip_src;
ip->ip_src = nat->nat_inip;
ipn = nat_new(nat->nat_ptr, ip, &fi, IPN_TCP|FI_W_DPORT, NAT_OUTBOUND);
if (ipn != NULL) {
ipn->nat_age = fr_defnatage;
(void) fr_addstate(ip, &fi, FI_W_DPORT);
}
ip->ip_src = swip;
if ((rap->rap_mode & RAP_M_UDP_ROBUST) == RAP_M_UDP_ROBUST) {
sp = rap->rap_prport;
}
return inc;
}
int ippr_raudio_in(fin, ip, aps, nat)
fr_info_t *fin;
ip_t *ip;
ap_session_t *aps;
nat_t *nat;
{
char membuf[IPF_MAXPORTLEN + 1], *s;
int off, dlen;
raudio_t *rap = aps->aps_data;
u_int a1, a2, a3, a4;
tcphdr_t *tcp;
tcp_seq seq;
mb_t *m;
#if SOLARIS
mb_t *m1;
#endif
if ((rap->rap_sdone != 0) ||
((rap->rap_mode & RAP_M_UDP_ROBUST) != RAP_M_UDP_ROBUST))
return 0;
tcp = (tcphdr_t *)fin->fin_dp;
off = (ip->ip_hl << 2) + (tcp->th_off << 2);
m = *(mb_t **)fin->fin_mp;
#if SOLARIS
m = fin->fin_qfm;
dlen = msgdsize(m) - off;
if (dlen <= 0)
return 0;
bzero(membuf, sizeof(membuf));
copyout_mblk(m, off, MIN(sizeof(membuf), dlen), membuf);
#else
dlen = mbufchainlen(m) - off;
if (dlen <= 0)
return 0;
bzero(membuf, sizeof(membuf));
m_copydata(m, off, MIN(sizeof(membuf), dlen), membuf);
#endif
seq = ntohl(tcp->th_seq);
/*
* Check to see if the data in this packet is of interest to us.
* We only care for the first 19 bytes coming back from the server.
*/
if (rap->rap_sseq == 0) {
s = memstr("PNA", membuf, 3, dlen);
if (s == NULL)
return 0;
a1 = s - membuf;
dlen -= a1;
a1 = 0;
rap->rap_sseq = seq;
a2 = MIN(dlen, sizeof(rap->rap_svr));
} else if (seq <= rap->rap_sseq + sizeof(rap->rap_svr)) {
/*
* seq # which is the start of data and from that the offset
* into the buffer array.
*/
a1 = seq - rap->rap_sseq;
a2 = MIN(dlen, sizeof(rap->rap_svr));
a2 -= a1;
s = membuf;
} else
return 0;
for (a3 = a1, a4 = a2; a4 > 0; a4--, a3++) {
rap->rap_sbf |= (1 << a3);
rap->rap_svr[a3] = *s++;
}
if (rap->rap_sbf == 0x7ffff) { /* 19 bits */
s = rap->rap_svr + 13;
rap->rap_srport = (*s << 8) | *(s + 1);
}
return 0;
}