--- /dev/null
+#include <pcap/pcap.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <time.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+
+#include <map>
+#include <string>
+
+using namespace std;
+
+struct groupstats {
+ groupstats() : count(0) {}
+
+ int count;
+ struct timeval last_seen;
+};
+map<uint32_t, groupstats> stats;
+
+struct timeval now;
+
+void callback(u_char *user, const struct pcap_pkthdr *h, const u_char *bytes)
+{
+ now = h->ts;
+
+ const iphdr *ip = (const iphdr *)(bytes + 16);
+ if ((ntohl(ip->daddr) & 0xe0000000) != (224u << 24) ||
+ (ntohl(ip->daddr) & 0xffffff00) == (224u << 24) ||
+ ip->daddr == 0xffffffffu ||
+ ip->protocol != 17) {
+ return;
+ }
+
+ ++stats[ip->daddr].count;
+ stats[ip->daddr].last_seen = h->ts;
+}
+
+double tdiff(const timeval &a, const timeval &b)
+{
+ return (b.tv_sec - a.tv_sec) +
+ 1e-6 * (b.tv_usec - a.tv_usec);
+}
+
+void cleanup()
+{
+ for (auto it = stats.begin(); it != stats.end(); ) {
+ if (tdiff(it->second.last_seen, now) < 1.0) {
+ ++it;
+ continue;
+ }
+
+ in_addr ip;
+ ip.s_addr = it->first;
+ printf("%s %d\n", inet_ntoa(ip), it->second.count);
+ fflush(stdout);
+ it = stats.erase(it);
+ }
+}
+
+int main(void)
+{
+ char errbuf[PCAP_ERRBUF_SIZE];
+ pcap_t *pcap = pcap_create("any", NULL);
+ if (pcap == NULL) {
+ fprintf(stderr, "pcap_create(): %s\n", errbuf);
+ exit(1);
+ }
+
+ pcap_activate(pcap);
+
+ for ( ;; ) {
+ pcap_dispatch(pcap, 10000, callback, NULL);
+ cleanup();
+ usleep(10000);
+ }
+}
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+
+// #define NETWORK "233.121.29.%d" // workzone
+// #define NETWORK "233.83.45.%d" // nrk [tomt]
+// #define NETWORK "233.60.200.%d" // comvie [tomt]
+// #define NETWORK "239.193.0.%d" // uninett??
+// #define NETWORK "233.155.107.%d" // tv2
+#define NETWORK "224.67.163.%d" // blokk med stortinget i
+
+void join_group(int sock, int i)
+{
+ struct ip_mreqn mreq;
+ // char buf[256];
+ // snprintf(buf, 256, NETWORK, i);
+ // printf("%s\n", buf);
+ //mreq.imr_multiaddr.s_addr = inet_addr(buf);
+
+ mreq.imr_multiaddr.s_addr = i;
+ printf("%s\n", inet_ntoa(mreq.imr_multiaddr));
+ mreq.imr_address.s_addr = INADDR_ANY;
+ mreq.imr_ifindex = 0;
+ setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+}
+
+void leave_group(int sock, int i)
+{
+ struct ip_mreqn mreq;
+ // char buf[256];
+ // snprintf(buf, 256, NETWORK, i);
+ // mreq.imr_multiaddr.s_addr = inet_addr(buf);
+ mreq.imr_multiaddr.s_addr = i;
+ mreq.imr_address.s_addr = INADDR_ANY;
+ mreq.imr_ifindex = 0;
+ setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
+}
+
+int main(int argc, char **argv)
+{
+ int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ in_addr_t from = inet_addr(argv[1]);
+ in_addr_t to = inet_addr(argv[2]);
+ uint32_t skip = atoi(argv[3]);
+
+ for (in_addr_t i = ntohl(from); i <= ntohl(to); i += skip) {
+ join_group(sock, htonl(i));
+ if (i - ntohl(from) >= 10 * skip) {
+ leave_group(sock, htonl(i - 10 * skip));
+ }
+ usleep(200000);
+ }
+
+ sleep(2);
+}