2 * $FreeBSD: src/sys/contrib/ipfilter/netinet/ip_rcmd_pxy.c,v 1.8.2.4 2004/07/04 09:24:39 darrenr Exp $
3 * $DragonFly: src/sys/contrib/ipfilter/netinet/ip_raudio_pxy.c,v 1.4 2004/07/28 00:22:37 hmp Exp $
5 #if SOLARIS && defined(_KERNEL)
6 extern kmutex_t ipf_rw;
9 #define IPF_RAUDIO_PROXY
12 int ippr_raudio_init (void);
13 int ippr_raudio_new (fr_info_t *, ip_t *, ap_session_t *, nat_t *);
14 int ippr_raudio_in (fr_info_t *, ip_t *, ap_session_t *, nat_t *);
15 int ippr_raudio_out (fr_info_t *, ip_t *, ap_session_t *, nat_t *);
17 static frentry_t raudiofr;
21 * Real Audio application proxy initialization.
23 int ippr_raudio_init()
25 bzero((char *)&raudiofr, sizeof(raudiofr));
27 raudiofr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
33 * Setup for a new proxy to handle Real Audio.
35 int ippr_raudio_new(fin, ip, aps, nat)
44 KMALLOCS(aps->aps_data, void *, sizeof(raudio_t));
45 if (aps->aps_data == NULL)
48 bzero(aps->aps_data, sizeof(raudio_t));
50 aps->aps_psiz = sizeof(raudio_t);
51 rap->rap_mode = RAP_M_TCP; /* default is for TCP */
57 int ippr_raudio_out(fin, ip, aps, nat)
63 raudio_t *rap = aps->aps_data;
64 unsigned char membuf[512 + 1], *s;
72 * If we've already processed the start messages, then nothing left
73 * for the proxy to do.
75 if (rap->rap_eos == 1)
78 tcp = (tcphdr_t *)fin->fin_dp;
79 off = fin->fin_hlen + (tcp->th_off << 2);
80 bzero(membuf, sizeof(membuf));
84 dlen = msgdsize(m) - off;
87 dlen = MIN(sizeof(membuf), dlen);
88 copyout_mblk(m, off, dlen, (char *)membuf);
90 m = *(mb_t **)fin->fin_mp;
92 dlen = mbufchainlen(m) - off;
95 dlen = MIN(sizeof(membuf), dlen);
96 m_copydata(m, off, dlen, (char *)membuf);
99 * In all the startup parsing, ensure that we don't go outside
100 * the packet buffer boundary.
103 * Look for the start of connection "PNA" string if not seen yet.
105 if (rap->rap_seenpna == 0) {
106 s = (u_char *)memstr("PNA", (char *)membuf, 3, dlen);
110 rap->rap_seenpna = 1;
115 * Directly after the PNA will be the version number of this
118 if (rap->rap_seenpna == 1 && rap->rap_seenver == 0) {
119 if ((s + 1) - membuf < dlen) {
120 rap->rap_version = (*s << 8) | *(s + 1);
122 rap->rap_seenver = 1;
128 * Now that we've been past the PNA and version number, we're into the
129 * startup messages block. This ends when a message with an ID of 0.
131 while ((rap->rap_eos == 0) && ((s + 1) - membuf < dlen)) {
132 if (rap->rap_gotid == 0) {
133 id = (*s << 8) | *(s + 1);
136 if (id == RA_ID_END) {
140 } else if (rap->rap_gotlen == 0) {
141 len = (*s << 8) | *(s + 1);
146 if (rap->rap_gotid == 1 && rap->rap_gotlen == 1) {
147 if (id == RA_ID_UDP) {
148 rap->rap_mode &= ~RAP_M_TCP;
149 rap->rap_mode |= RAP_M_UDP;
150 rap->rap_plport = (*s << 8) | *(s + 1);
151 } else if (id == RA_ID_ROBUST) {
152 rap->rap_mode |= RAP_M_ROBUST;
153 rap->rap_prport = (*s << 8) | *(s + 1);
164 int ippr_raudio_in(fin, ip, aps, nat)
170 unsigned char membuf[IPF_MAXPORTLEN + 1], *s;
171 tcphdr_t *tcp, tcph, *tcp2 = &tcph;
172 raudio_t *rap = aps->aps_data;
173 int off, dlen, slen, clen;
174 struct in_addr swa, swb;
184 * Wait until we've seen the end of the start messages and even then
185 * only proceed further if we're using UDP. If they want to use TCP
186 * then data is sent back on the same channel that is already open.
188 if (rap->rap_sdone != 0)
191 tcp = (tcphdr_t *)fin->fin_dp;
192 off = fin->fin_hlen + (tcp->th_off << 2);
193 m = *(mb_t **)fin->fin_mp;
198 dlen = msgdsize(m) - off;
201 bzero(membuf, sizeof(membuf));
202 clen = MIN(sizeof(membuf), dlen);
203 copyout_mblk(m, off, clen, (char *)membuf);
205 dlen = mbufchainlen(m) - off;
208 bzero(membuf, sizeof(membuf));
209 clen = MIN(sizeof(membuf), dlen);
210 m_copydata(m, off, clen, (char *)membuf);
213 seq = ntohl(tcp->th_seq);
215 * Check to see if the data in this packet is of interest to us.
216 * We only care for the first 19 bytes coming back from the server.
218 if (rap->rap_sseq == 0) {
219 s = (u_char *)memstr("PNA", (char *)membuf, 3, clen);
226 a2 = MIN(dlen, sizeof(rap->rap_svr));
227 } else if (seq <= rap->rap_sseq + sizeof(rap->rap_svr)) {
229 * seq # which is the start of data and from that the offset
230 * into the buffer array.
232 a1 = seq - rap->rap_sseq;
233 a2 = MIN(dlen, sizeof(rap->rap_svr));
239 for (a3 = a1, a4 = a2; (a4 > 0) && (a3 < 19) && (a3 >= 0); a4--,a3++) {
240 rap->rap_sbf |= (1 << a3);
241 rap->rap_svr[a3] = *s++;
244 if ((rap->rap_sbf != 0x7ffff) || (!rap->rap_eos)) /* 19 bits */
248 s = (u_char *)rap->rap_svr + 11;
249 if (((*s << 8) | *(s + 1)) == RA_ID_ROBUST) {
251 rap->rap_srport = (*s << 8) | *(s + 1);
258 ip->ip_p = IPPROTO_UDP;
259 ip->ip_src = nat->nat_inip;
260 ip->ip_dst = nat->nat_oip;
262 bcopy((char *)fin, (char *)&fi, sizeof(fi));
263 bzero((char *)tcp2, sizeof(*tcp2));
265 fi.fin_dp = (char *)tcp2;
266 fi.fin_fr = &raudiofr;
267 fi.fin_dlen = sizeof(*tcp2);
268 tcp2->th_win = htons(8192);
270 ip->ip_len = fin->fin_hlen + sizeof(*tcp);
272 if (((rap->rap_mode & RAP_M_UDP_ROBUST) == RAP_M_UDP_ROBUST) &&
273 (rap->rap_srport != 0)) {
274 dp = rap->rap_srport;
275 sp = rap->rap_prport;
276 tcp2->th_sport = htons(sp);
277 tcp2->th_dport = htons(dp);
281 ipn = nat_new(&fi, ip, nat->nat_ptr, NULL,
282 IPN_UDP | (sp ? 0 : FI_W_SPORT), NAT_OUTBOUND);
284 ipn->nat_age = fr_defnatage;
285 (void) fr_addstate(ip, &fi, NULL,
286 FI_IGNOREPKT|FI_NORULE|
287 (sp ? 0 : FI_W_SPORT));
291 if ((rap->rap_mode & RAP_M_UDP) == RAP_M_UDP) {
292 sp = rap->rap_plport;
293 tcp2->th_sport = htons(sp);
294 tcp2->th_dport = 0; /* XXX - don't specify remote port */
298 ipn = nat_new(&fi, ip, nat->nat_ptr, NULL, IPN_UDP|FI_W_DPORT,
301 ipn->nat_age = fr_defnatage;
302 (void) fr_addstate(ip, &fi, NULL,
303 FI_W_DPORT|FI_IGNOREPKT|FI_NORULE);