pcap: update to version 1.0.0, add extension for changing the desired protocol for the internal raw socket (useful for reducing the cpu overhead of capture)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15398 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 149 insertions, 0 deletions

diff --git a/package/libpcap/patches/101-debian_fix_any_intf.patch b/package/libpcap/patches/101-debian_fix_any_intf.patch
new file mode 100644
index 0000000000..8da6ef2237
--- /dev/null
+++ b/package/libpcap/patches/101-debian_fix_any_intf.patch
@@ -0,0 +1,149 @@
+--- a/pcap-linux.c
++++ b/pcap-linux.c
+@@ -297,6 +297,12 @@ pcap_create(const char *device, char *eb
+ {
+ 	pcap_t *handle;
+ 
++	/*
++	 * A null device name is equivalent to the "any" device.
++	 */
++	if (device == NULL)
++		device = "any";
++
+ #ifdef HAVE_DAG_API
+ 	if (strstr(device, "dag")) {
+ 		return dag_create(device, ebuf);
+@@ -338,10 +344,9 @@ pcap_can_set_rfmon_linux(pcap_t *p)
+ 	struct iwreq ireq;
+ #endif
+ 
+-	if (p->opt.source == NULL) {
++	if (strcmp(p->opt.source, "any") == 0) {
+ 		/*
+-		 * This is equivalent to the "any" device, and we don't
+-		 * support monitor mode on it.
++		 * Monitor mode makes no sense on the "any" device.
+ 		 */
+ 		return 0;
+ 	}
+@@ -518,12 +523,11 @@ pcap_activate_linux(pcap_t *handle)
+ 	handle->stats_op = pcap_stats_linux;
+ 
+ 	/*
+-	 * NULL and "any" are special devices which give us the hint to
+-	 * monitor all devices.
++	 * The "any" device is a special device which causes us not
++	 * to bind to a particular device and thus to look at all
++	 * devices.
+ 	 */
+-	if (!device || strcmp(device, "any") == 0) {
+-		device			= NULL;
+-		handle->md.device	= strdup("any");
++	if (strcmp(device, "any") == 0) {
+ 		if (handle->opt.promisc) {
+ 			handle->opt.promisc = 0;
+ 			/* Just a warning. */
+@@ -531,10 +535,9 @@ pcap_activate_linux(pcap_t *handle)
+ 			    "Promiscuous mode not supported on the \"any\" device");
+ 			status = PCAP_WARNING_PROMISC_NOTSUP;
+ 		}
++	}
+ 
+-	} else
+-		handle->md.device	= strdup(device);
+-
++	handle->md.device	= strdup(device);
+ 	if (handle->md.device == NULL) {
+ 		snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "strdup: %s",
+ 			 pcap_strerror(errno) );
+@@ -1657,19 +1660,21 @@ static int
+ activate_new(pcap_t *handle)
+ {
+ #ifdef HAVE_PF_PACKET_SOCKETS
++	const char		*device = handle->opt.source;
++	int			is_any_device = (strcmp(device, "any") == 0);
+ 	int			sock_fd = -1, arptype, val;
+ 	int			err = 0;
+ 	struct packet_mreq	mr;
+-	const char* device = handle->opt.source;
+ 
+ 	/*
+-	 * Open a socket with protocol family packet. If a device is
+-	 * given we try to open it in raw mode otherwise we use
+-	 * the cooked interface.
+-	 */
+-	sock_fd = device ?
+-		socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))
+-	      : socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL));
++	 * Open a socket with protocol family packet. If the
++	 * "any" device was specified, we open a SOCK_DGRAM
++	 * socket for the cooked interface, otherwise we first
++	 * try a SOCK_RAW socket for the raw interface.
++	 */
++	sock_fd = is_any_device ?
++		socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL)) :
++		socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+ 
+ 	if (sock_fd == -1) {
+ 		snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
+@@ -1704,7 +1709,7 @@ activate_new(pcap_t *handle)
+ 	 * to cooked mode if we have an unknown interface type
+ 	 * or a type we know doesn't work well in raw mode.
+ 	 */
+-	if (device) {
++	if (!is_any_device) {
+ 		/* Assume for now we don't need cooked mode. */
+ 		handle->md.cooked = 0;
+ 
+@@ -1819,15 +1824,23 @@ activate_new(pcap_t *handle)
+ 		}
+ 	} else {
+ 		/*
+-		 * This is cooked mode.
++		 * The "any" device.
++		 */
++		if (handle->opt.rfmon) {
++			/*
++			 * It doesn't support monitor mode.
++			 */
++			return PCAP_ERROR_RFMON_NOTSUP;
++		}
++
++		/*
++		 * It uses cooked mode.
+ 		 */
+ 		handle->md.cooked = 1;
+ 		handle->linktype = DLT_LINUX_SLL;
+ 
+ 		/*
+ 		 * We're not bound to a device.
+-		 * XXX - true?  Or true only if we're using
+-		 * the "any" device?
+ 		 * For now, we're using this as an indication
+ 		 * that we can't transmit; stop doing that only
+ 		 * if we figure out how to transmit in cooked
+@@ -1852,10 +1865,13 @@ activate_new(pcap_t *handle)
+ 
+ 	/*
+ 	 * Hmm, how can we set promiscuous mode on all interfaces?
+-	 * I am not sure if that is possible at all.
++	 * I am not sure if that is possible at all.  For now, we
++	 * silently ignore attempts to turn promiscuous mode on
++	 * for the "any" device (so you don't have to explicitly
++	 * disable it in programs such as tcpdump).
+ 	 */
+ 
+-	if (device && handle->opt.promisc) {
++	if (!is_any_device && handle->opt.promisc) {
+ 		memset(&mr, 0, sizeof(mr));
+ 		mr.mr_ifindex = handle->md.ifindex;
+ 		mr.mr_type    = PACKET_MR_PROMISC;
+@@ -3118,7 +3134,7 @@ activate_old(pcap_t *handle)
+ 
+ 	/* Bind to the given device */
+ 
+-	if (!device) {
++	if (strcmp(device, "any") == 0) {
+ 		strncpy(handle->errbuf, "pcap_activate: The \"any\" device isn't supported on 2.0[.x]-kernel systems",
+ 			PCAP_ERRBUF_SIZE);
+ 		return PCAP_ERROR;