#include <stdlib.h>
#include <stdio.h>

#include <pcap.h>


void main(int argc, char **argv)
{
pcap_t *fp;
char errbuf[PCAP_ERRBUF_SIZE];
u_char packet[100];
int i;

    /* Check the validity of the command line */
    if (argc != 2)
    {
        printf("usage: %s interface (e.g. 'rpcap://eth0')", argv[0]);
        return;
    }
    
    /* Open the output device */
    if ( (fp= pcap_open(argv[1],            // name of the device
                        100,                // portion of the packet to capture (only the first 100 bytes)
                        PCAP_OPENFLAG_PROMISCUOUS,  // promiscuous mode
                        1000,               // read timeout
                        NULL,               // authentication on the remote machine
                        errbuf              // error buffer
                        ) ) == NULL)
    {
        fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", argv[1]);
        return;
    }

    /* 假设在以太网上，设置MAC的目的地址为 1:1:1:1:1:1 */
    packet[0]=1;
    packet[1]=1;
    packet[2]=1;
    packet[3]=1;
    packet[4]=1;
    packet[5]=1;
    
    /* 设置MAC源地址为 2:2:2:2:2:2 */
    packet[6]=2;
    packet[7]=2;
    packet[8]=2;
    packet[9]=2;
    packet[10]=2;
    packet[11]=2;
    
    /* 填充剩下的内容 */
    for(i=12;i<100;i++)
    {
        packet[i]=(u_char)i;
    }

    /* 发送数据包 */
    if (pcap_sendpacket(fp, packet, 100 /* size */) != 0)
    {
        fprintf(stderr,"\nError sending the packet: %s\n", pcap_geterr(fp));
        return;
    }

    return;
}

/*
 * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
 * Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Politecnico di Torino, CACE Technologies 
 * nor the names of its contributors may be used to endorse or promote 
 * products derived from this software without specific prior written 
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <stdlib.h>
#include <stdio.h>

#include <pcap.h>

void usage();

void main(int argc, char **argv)
{
    pcap_t *indesc,*outdesc;
    char errbuf[PCAP_ERRBUF_SIZE];
    char source[PCAP_BUF_SIZE];
    FILE *capfile;
    int caplen, sync;
    u_int res;
    pcap_send_queue *squeue;
    struct pcap_pkthdr *pktheader;
    u_char *pktdata;
    float cpu_time;
    u_int npacks = 0;
    errno_t fopen_error;

    /* Check the validity of the command line */
    if (argc <= 2 || argc >= 5)
    {
        usage();
        return;
    }
        
    /* Retrieve the length of the capture file */
    fopen_error = fopen_s(&capfile, argv[1],"rb");
    if(fopen_error != 0){
        printf("Error opening the file, errno %d.\n", fopen_error);
        return;
    }
    
    fseek(capfile , 0, SEEK_END);
    caplen= ftell(capfile)- sizeof(struct pcap_file_header);
    fclose(capfile);
            
    /* Chek if the timestamps must be respected */
    if(argc == 4 && argv[3][0] == 's')
        sync = TRUE;
    else
        sync = FALSE;

    /* Open the capture */
    /* Create the source string according to the new WinPcap syntax */
    if ( pcap_createsrcstr( source,         // variable that will keep the source string
                            PCAP_SRC_FILE,  // we want to open a file
                            NULL,           // remote host
                            NULL,           // port on the remote host
                            argv[1],        // name of the file we want to open
                            errbuf          // error buffer
                            ) != 0)
    {
        fprintf(stderr,"\nError creating a source string\n");
        return;
    }
    
    /* Open the capture file */
    if ( (indesc= pcap_open(source, 65536, PCAP_OPENFLAG_PROMISCUOUS, 1000, NULL, errbuf) ) == NULL)
    {
        fprintf(stderr,"\nUnable to open the file %s.\n", source);
        return;
    }

    /* Open the output adapter */
    if ( (outdesc= pcap_open(argv[2], 100, PCAP_OPENFLAG_PROMISCUOUS, 1000, NULL, errbuf) ) == NULL)
    {
        fprintf(stderr,"\nUnable to open adapter %s.\n", source);
        return;
    }

    /* Check the MAC type */
    if (pcap_datalink(indesc) != pcap_datalink(outdesc))
    {
        printf("Warning: the datalink of the capture differs from the one of the selected interface.\n");
        printf("Press a key to continue, or CTRL+C to stop.\n");
        getchar();
    }

    /* Allocate a send queue */
    squeue = pcap_sendqueue_alloc(caplen);

    /* Fill the queue with the packets from the file */
    while ((res = pcap_next_ex( indesc, &pktheader, &pktdata)) == 1)
    {
        if (pcap_sendqueue_queue(squeue, pktheader, pktdata) == -1)
        {
            printf("Warning: packet buffer too small, not all the packets will be sent.\n");
            break;
        }

        npacks++;
    }

    if (res == -1)
    {
        printf("Corrupted input file.\n");
        pcap_sendqueue_destroy(squeue);
        return;
    }

    /* Transmit the queue */
    
    cpu_time = (float)clock ();

    if ((res = pcap_sendqueue_transmit(outdesc, squeue, sync)) < squeue->len)
    {
        printf("An error occurred sending the packets: %s. Only %d bytes were sent\n", pcap_geterr(outdesc), res);
    }
    
    cpu_time = (clock() - cpu_time)/CLK_TCK;
    
    printf ("\n\nElapsed time: %5.3f\n", cpu_time);
    printf ("\nTotal packets generated = %d", npacks);
    printf ("\nAverage packets per second = %d", (int)((double)npacks/cpu_time));
    printf ("\n");

    /* free the send queue */
    pcap_sendqueue_destroy(squeue);

    /* Close the input file */
    pcap_close(indesc);

    /* 
     * lose the output adapter 
     * IMPORTANT: remember to close the adapter, otherwise there will be no guarantee that all the 
     * packets will be sent!
     */
    pcap_close(outdesc);


    return;
}


void usage()
{
    
    printf("\nSendcap, sends a libpcap/tcpdump capture file to the net. Copyright (C) 2002 Loris Degioanni.\n");
    printf("\nUsage:\n");
    printf("\t sendcap file_name adapter [s]\n");
    printf("\nParameters:\n");
    printf("\nfile_name: the name of the dump file that will be sent to the network\n");
    printf("\nadapter: the device to use. Use \"WinDump -D\" for a list of valid devices\n");
    printf("\ns: if present, forces the packets to be sent synchronously, i.e. respecting the timestamps in the dump file. This option will work only under Windows NTx.\n\n");

    exit(0);
}