304 lines
6.6 KiB
C
304 lines
6.6 KiB
C
/*
|
|
* $FreeBSD$
|
|
*/
|
|
#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;
|
|
{
|
|
raudio_t *rap = aps->aps_data;
|
|
unsigned char membuf[512 + 1], *s;
|
|
u_short id = 0;
|
|
tcphdr_t *tcp;
|
|
int off, dlen;
|
|
int len = 0;
|
|
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), (char *)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), (char *)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 = (u_char *)memstr("PNA", (char *)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;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ippr_raudio_in(fin, ip, aps, nat)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
ap_session_t *aps;
|
|
nat_t *nat;
|
|
{
|
|
unsigned char membuf[IPF_MAXPORTLEN + 1], *s;
|
|
tcphdr_t *tcp, tcph, *tcp2 = &tcph;
|
|
raudio_t *rap = aps->aps_data;
|
|
struct in_addr swa, swb;
|
|
u_int a1, a2, a3, a4;
|
|
u_short sp, dp;
|
|
int off, dlen;
|
|
fr_info_t fi;
|
|
tcp_seq seq;
|
|
nat_t *ipn;
|
|
u_char swp;
|
|
mb_t *m;
|
|
#if SOLARIS
|
|
mb_t *m1;
|
|
#endif
|
|
|
|
/*
|
|
* Wait until we've seen the end of the start messages and even then
|
|
* only proceed further if we're using UDP. If they want to use TCP
|
|
* then data is sent back on the same channel that is already open.
|
|
*/
|
|
if (rap->rap_sdone != 0)
|
|
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), (char *)membuf);
|
|
#else
|
|
dlen = mbufchainlen(m) - off;
|
|
if (dlen <= 0)
|
|
return 0;
|
|
bzero(membuf, sizeof(membuf));
|
|
m_copydata(m, off, MIN(sizeof(membuf), dlen), (char *)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 = (u_char *)memstr("PNA", (char *)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) && (a3 < 19) && (a3 >= 0); a4--,a3++) {
|
|
rap->rap_sbf |= (1 << a3);
|
|
rap->rap_svr[a3] = *s++;
|
|
}
|
|
|
|
if ((rap->rap_sbf != 0x7ffff) || (!rap->rap_eos)) /* 19 bits */
|
|
return 0;
|
|
rap->rap_sdone = 1;
|
|
|
|
s = (u_char *)rap->rap_svr + 11;
|
|
if (((*s << 8) | *(s + 1)) == RA_ID_ROBUST) {
|
|
s += 2;
|
|
rap->rap_srport = (*s << 8) | *(s + 1);
|
|
}
|
|
|
|
swp = ip->ip_p;
|
|
swa = ip->ip_src;
|
|
swb = ip->ip_dst;
|
|
|
|
ip->ip_p = IPPROTO_UDP;
|
|
ip->ip_src = nat->nat_inip;
|
|
ip->ip_dst = nat->nat_oip;
|
|
|
|
bcopy((char *)fin, (char *)&fi, sizeof(fi));
|
|
bzero((char *)tcp2, sizeof(*tcp2));
|
|
fi.fin_dp = (char *)tcp2;
|
|
fi.fin_fr = &raudiofr;
|
|
tcp2->th_win = htons(8192);
|
|
|
|
if (((rap->rap_mode & RAP_M_UDP_ROBUST) == RAP_M_UDP_ROBUST) &&
|
|
(rap->rap_srport != 0)) {
|
|
dp = rap->rap_srport;
|
|
sp = rap->rap_prport;
|
|
tcp2->th_sport = htons(sp);
|
|
tcp2->th_dport = htons(dp);
|
|
fi.fin_data[0] = dp;
|
|
fi.fin_data[1] = sp;
|
|
ipn = nat_new(nat->nat_ptr, ip, &fi,
|
|
IPN_UDP | (sp ? 0 : FI_W_SPORT),
|
|
NAT_OUTBOUND);
|
|
if (ipn != NULL) {
|
|
ipn->nat_age = fr_defnatage;
|
|
(void) fr_addstate(ip, &fi, sp ? 0 : FI_W_SPORT);
|
|
}
|
|
}
|
|
|
|
if ((rap->rap_mode & RAP_M_UDP) == RAP_M_UDP) {
|
|
sp = rap->rap_plport;
|
|
tcp2->th_sport = htons(sp);
|
|
tcp2->th_dport = 0; /* XXX - don't specify remote port */
|
|
fi.fin_data[0] = sp;
|
|
fi.fin_data[1] = 0;
|
|
ipn = nat_new(nat->nat_ptr, ip, &fi, IPN_UDP|FI_W_DPORT,
|
|
NAT_OUTBOUND);
|
|
if (ipn != NULL) {
|
|
ipn->nat_age = fr_defnatage;
|
|
(void) fr_addstate(ip, &fi, FI_W_DPORT);
|
|
}
|
|
}
|
|
|
|
ip->ip_p = swp;
|
|
ip->ip_src = swa;
|
|
ip->ip_dst = swb;
|
|
return 0;
|
|
}
|