linux pfring接收示例程序

以下是一个简单的 Linux PFRING 接收示例程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <time.h>

#include <pfring.h>

#define MAX_PACKET_SIZE 1522

void sigproc(int sig) {
    printf("Interrupted\n");
    exit(0);
}

int main(int argc, char **argv) {
    if (argc != 2) {
        printf("Usage: %s [interface]\n", argv[0]);
        exit(1);
    }

    signal(SIGINT, sigproc);

    pfring *ring = pfring_open(argv[1], MAX_PACKET_SIZE, PF_RING_PROMISC);
    if (!ring) {
        perror("pfring_open");
        exit(1);
    }

    if (pfring_enable_ring(ring) != 0) {
        perror("pfring_enable_ring");
        exit(1);
    }

    char buf[MAX_PACKET_SIZE];
    struct pfring_pkthdr pkthdr;

    while (1) {
        int rc = pfring_recv(ring, &buf, sizeof(buf), &pkthdr, 1);
        if (rc <= 0) {
            if (rc == 0)
                continue;

            if (rc == -1 && errno == EINTR)
                continue;

            if (rc == -1 && (errno == ENOBUFS || errno == EAGAIN))
                continue;

            perror("pfring_recv");
            continue;
        }

        printf("Received packet of size %d at %s", pkthdr.len, ctime((const time_t *)&pkthdr.ts.tv_sec));
    }

    pfring_close(ring);

    return 0;
}

该程序使用 PFRING 库接收从指定接口收到的网络数据包，并打印每个接收到的数据包的大小和时间戳。请注意，该程序需要以 root 权限运行，并且需要安装 PFRING 库和相应的开发包。