void set_adrs(SymTbl *tp) /* 変数・引数の番地割当 */
{
int i, size = INTSIZE;
switch (tp->nmKind) {
case varId: /* 変数 */
if (tp->aryLen > 0) size *= tp->aryLen; /* 配列ならサイズ計算 */
if (is_global()) tp->adrs = mallocG(size); /* 大域変数 */
else tp->adrs = mallocL(size); /* 局所変数 */
break;
case fncId: /* 関数 */
tp->adrs = nextCodeCt(); /* 関数入口アドレス設定 */
for (i=1; i<=tp->args; i++) {
(tp+i)->adrs = mallocL(size); /* 引数のアドレス割当 */
}
}
}
// returns -1 for failures including the other end closing the socket
// returns 0 if successful in reading data, but still not read the data fully
// returns 1 if successful in reading all the data
mDNSlocal int ProxyTCPRead(ProxyTCPInfo_t *tcpInfo)
{
long n;
mDNSBool closed;
if (tcpInfo->nread < 2) // First read the two-byte length preceeding the DNS message
{
mDNSu8 *lenptr = (mDNSu8 *)&tcpInfo->replyLen;
n = mDNSPlatformReadTCP(&tcpInfo->sock, lenptr + tcpInfo->nread, 2 - tcpInfo->nread, &closed);
if (n < 0 || closed)
{
LogMsg("ProxyTCPRead: attempt to read message length failed");
return -1;
}
tcpInfo->nread += n;
if (tcpInfo->nread < 2)
{
LogMsg("ProxyTCPRead: nread %d, n %d", tcpInfo->nread, n);
return 0;
}
tcpInfo->replyLen = (mDNSu16)((mDNSu16)lenptr[0] << 8 | lenptr[1]);
if (tcpInfo->replyLen < sizeof(DNSMessageHeader))
{
LogMsg("ProxyTCPRead: Message length too short (%d bytes)", tcpInfo->replyLen);
return -1;
}
tcpInfo->reply = mallocL("ProxyTCPInfo", tcpInfo->replyLen);
if (!tcpInfo->reply)
{
LogMsg("ProxyTCPRead: Memory failure");
return -1;
}
}
n = mDNSPlatformReadTCP(&tcpInfo->sock, ((char *)tcpInfo->reply) + (tcpInfo->nread - 2), tcpInfo->replyLen - (tcpInfo->nread - 2), &closed);
if (n < 0 || closed)
{
LogMsg("ProxyTCPRead: read failure n %d, closed %d", n, closed);
return -1;
}
tcpInfo->nread += n;
if ((tcpInfo->nread - 2) != tcpInfo->replyLen)
return 0;
else
return 1;
}
mDNSlocal void ProxyTCPAccept(int s1, short filter, void *context)
{
int newfd;
struct sockaddr_storage ss;
socklen_t sslen = sizeof(ss);
const int on = 1;
KQSocketSet *listenSet = (KQSocketSet *)context;
(void) filter;
while ((newfd = accept(s1, (struct sockaddr *)&ss, &sslen)) != -1)
{
int err;
int *s;
KQueueEntry *k;
KQSocketSet *kq;
// Even though we just need a single KQueueEntry, for simplicity we re-use
// the KQSocketSet
ProxyTCPInfo_t *ti = mallocL("ProxyTCPContext", sizeof(ProxyTCPInfo_t));
if (!ti)
{
LogMsg("ProxyTCPAccept: cannot allocate TCPSocket");
close(newfd);
return;
}
mDNSPlatformMemZero(ti, sizeof(ProxyTCPInfo_t));
TCPSocket *sock = &ti->sock;
kq = &sock->ss;
kq->sktv4 = -1;
kq->sktv6 = -1;
kq->m = listenSet->m;
fcntl(newfd, F_SETFL, fcntl(newfd, F_GETFL, 0) | O_NONBLOCK); // set non-blocking
if (ss.ss_family == AF_INET)
{
s = &kq->sktv4;
k = &kq->kqsv4;
// Receive interface identifiers
err = setsockopt(newfd, IPPROTO_IP, IP_RECVIF, &on, sizeof(on));
if (err)
{
LogMsg("ProxyTCPAccept: IP_RECVIF %d errno %d (%s)", newfd, errno, strerror(errno));
mDNSPlatformDisposeProxyContext(ti);
return;
}
}
else
{
s = &kq->sktv6;
k = &kq->kqsv6;
// We want to receive destination addresses and receive interface identifiers
err = setsockopt(newfd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on));
if (err)
{
LogMsg("ProxyTCPAccept: IP_RECVPKTINFO %d errno %d (%s)", newfd, errno, strerror(errno));
mDNSPlatformDisposeProxyContext(ti);
return;
}
}
*s = newfd;
// mDNSPlatformReadTCP/WriteTCP (unlike the UDP counterpart) does not provide the destination address
// from which we can infer the destination address family. Hence we need to remember that here.
// Instead of remembering the address family, we remember the right fd.
sock->fd = newfd;
sock->kqEntry = k;
k->KQcallback = ProxyTCPSocketCallBack;
k->KQcontext = ti;
k->KQtask = "TCP Proxy packet reception";
#ifdef MDNSRESPONDER_USES_LIB_DISPATCH_AS_PRIMARY_EVENT_LOOP_MECHANISM
k->readSource = mDNSNULL;
k->writeSource = mDNSNULL;
k->fdClosed = mDNSfalse;
#endif
KQueueSet(*s, EV_ADD, EVFILT_READ, k);
}
}
