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authorguido <guido@FreeBSD.org>1999-11-23 21:44:59 +0000
committerguido <guido@FreeBSD.org>1999-11-23 21:44:59 +0000
commit75b4f99d65c79fc19890c1fe50a53dcb8e962c4b (patch)
treedd6e6ca037b001211b889429a9c8327f3e5285ed /sys/netinet/ip_raudio_pxy.c
parent892533638d4a03333aa25823e4d983593cdcc2b1 (diff)
downloadFreeBSD-src-75b4f99d65c79fc19890c1fe50a53dcb8e962c4b.zip
FreeBSD-src-75b4f99d65c79fc19890c1fe50a53dcb8e962c4b.tar.gz
Add kernel parts of revived ipfilter (3.3.3.)
Diffstat (limited to 'sys/netinet/ip_raudio_pxy.c')
-rw-r--r--sys/netinet/ip_raudio_pxy.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/sys/netinet/ip_raudio_pxy.c b/sys/netinet/ip_raudio_pxy.c
new file mode 100644
index 0000000..b76eea5
--- /dev/null
+++ b/sys/netinet/ip_raudio_pxy.c
@@ -0,0 +1,274 @@
+/*
+ * $Id$
+ * $FreeBSD$
+ */
+#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;
+}
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