154 lines
4.9 KiB
Diff
154 lines
4.9 KiB
Diff
--- a/pcap_wire.cc
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+++ b/pcap_wire.cc
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@@ -18,6 +18,7 @@
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#include <sys/time.h>
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#include <sys/select.h>
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+#include <sys/poll.h>
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/* Ways of finding the hardware MAC on this machine... */
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/* This is the Linux only fallback. */
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@@ -130,20 +131,18 @@ namespace NSLU2Upgrade {
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* non-static (real) Handler.
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*/
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void Handler(const struct pcap_pkthdr *packet_header, const u_char *packet) {
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- /* This should only be called once... */
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- if (captured)
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- throw std::logic_error("Handler called twice");
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-
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/* Verify the protocol and originating address of the packet, then
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* return this packet.
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*/
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+ if (captured)
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+ return;
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if (packet_header->caplen > 14 && (broadcast ||
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std::memcmp(packet+6, header, 6) == 0)) {
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- /* Record the address and copy the data */
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- std::memcpy(source, packet+6, 6);
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const size_t len(packet_header->caplen - 14);
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if (len > captureSize)
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- throw std::logic_error("packet too long");
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+ return;
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+ /* Record the address and copy the data */
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+ std::memcpy(source, packet+6, 6);
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std::memcpy(captureBuffer, packet+14, len);
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captureSize = len;
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captured = true;
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@@ -156,7 +155,7 @@ namespace NSLU2Upgrade {
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* packet and the buffer should be big enough.
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*/
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if (packet_header->caplen < packet_header->len)
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- throw std::logic_error("truncated packet");
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+ return;
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/*IGNORE EVIL: known evil cast */
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reinterpret_cast<PCapWire*>(user)->Handler(packet_header, packet);
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@@ -173,56 +172,24 @@ namespace NSLU2Upgrade {
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virtual void Receive(void *buffer, size_t &size, unsigned long timeout) {
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/* Now try to read packets until the timeout has been consumed.
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*/
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- struct timeval tvStart;
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- if (timeout > 0 && gettimeofday(&tvStart, 0) != 0)
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- throw OSError(errno, "gettimeofday(base)");
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+ int time_count;
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captureBuffer = buffer;
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captureSize = size;
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captured = false;
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+ time_count = timeout / 2000; /* 2 ms intervals */
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+ time_count++;
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do {
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/*IGNORE EVIL: known evil cast */
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- int count(pcap_dispatch(pcap, 1, PCapHandler,
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- reinterpret_cast<u_char*>(this)));
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+ int count = pcap_dispatch(pcap, 1, PCapHandler,
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+ reinterpret_cast<u_char*>(this));
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- if (count > 0) {
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- /* Were any packets handled? */
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- if (captured) {
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- size = captureSize;
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- return;
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- }
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- /* else try again. */
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- } else if (count == 0) {
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- /* Nothing to handle - do the timeout, do this
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- * by waiting a bit then trying again, the trick
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- * to this is to work out how long to wait each
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- * time, for the moment a 10ms delay is used.
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- */
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- if (timeout == 0)
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- break;
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-
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- struct timeval tvNow;
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- if (gettimeofday(&tvNow, 0) != 0)
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- throw OSError(errno, "gettimeofday(now)");
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-
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- unsigned long t(tvNow.tv_sec - tvStart.tv_sec);
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- t *= 1000000;
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- t += tvNow.tv_usec;
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- t -= tvStart.tv_usec;
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- if (t > timeout)
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- break;
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-
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- tvNow.tv_sec = 0;
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- tvNow.tv_usec = timeout-t;
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- if (tvNow.tv_usec > 10000)
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- tvNow.tv_usec = 10000;
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-
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- /* Delay, may be interrupted - this should
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- * be portable to the BSDs (since the
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- * technique originates in BSD.)
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- */
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- (void)select(0, 0, 0, 0, &tvNow);
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- } else {
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+ /* Were any packets handled? */
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+ if (captured) {
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+ size = captureSize;
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+ return;
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+ }
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+ if (count < 0) {
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/* Error condition. */
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if (count == -1) {
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if (errno != EINTR)
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@@ -232,7 +199,8 @@ namespace NSLU2Upgrade {
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} else
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throw std::logic_error("pcap unexpected result");
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}
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- } while (timeout != 0);
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+ time_count--;
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+ } while (time_count > 0);
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/* Here on timeout. */
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size = 0;
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@@ -288,6 +256,7 @@ NSLU2Upgrade::Wire *NSLU2Upgrade::Wire::
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const unsigned char *mac, const unsigned char *address, int uid) {
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/* This is used to store the error passed to throw. */
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static char PCapErrbuf[PCAP_ERRBUF_SIZE];
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+ struct bpf_program fp;
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/* Check the device name. If not given use 'DEFAULT_ETHERNET_IF'. */
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if (device == NULL)
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@@ -301,20 +270,12 @@ NSLU2Upgrade::Wire *NSLU2Upgrade::Wire::
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* for other ethernet MACs. (Because the code above does not
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* check that the destination matches the device in use).
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*/
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- pcap = pcap_open_live(device, 1540, false/*promiscuous*/, 1/*ms*/, PCapErrbuf);
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+ pcap = pcap_open_live(device, 1540, false/*promiscuous*/, 2/*ms*/, PCapErrbuf);
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if (pcap == NULL)
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throw WireError(errno, PCapErrbuf);
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}
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- /* Always do a non-blocking read, because the 'timeout' above
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- * doesn't work on Linux (return is immediate) and on OSX (and
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- * maybe other BSDs) the interface tends to hang waiting for
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- * the timeout to expire even after receiving a single packet.
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- */
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- if (pcap_setnonblock(pcap, true, PCapErrbuf))
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- throw WireError(errno, PCapErrbuf);
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-
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try {
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/* The MAC of the transmitting device is needed - without
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* this the return packet won't go to the right place!
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