[Winpcap-users] Compilation Error - Send queues
Gianluca Varenni
gianluca.varenni at cacetech.com
Tue May 2 16:40:49 GMT 2006
Marta,
those are linker errors, not compilation ones.
I think you may have forgotten to add wpcap.lib into your project settings.
Under VC2003, they are under Project->Properties, "Linker->Input" tree item, "Additional dependencies" item.
Have a nice day
GV
----- Original Message -----
From: Marta Perez
To: winpcap-users at winpcap.org
Sent: Tuesday, May 02, 2006 9:19 AM
Subject: Re: [Winpcap-users] Compilation Error - Send queues
Thanks Gianluca,
This morning I made the change you suggested, but then I got all the following errors (and assumed this wasn't right):
SendQWin32 error LNK2019: unresolved external symbol "int __cdecl pcap_sendqueue_queue(struct pcap_send_queue *,struct pcap_pkthdr const *,unsigned char const *)" (?pcap_sendqueue_queue@@YAHPAUpcap_send_queue@@PBUpcap_pkthdr@@PBE at Z) referenced in function _main
SendQWin32 error LNK2019: unresolved external symbol "struct pcap_send_queue * __cdecl pcap_sendqueue_alloc(unsigned int)" (?pcap_sendqueue_alloc@@YAPAUpcap_send_queue@@I at Z) referenced in function _main
SendQWin32 error LNK2019: unresolved external symbol "unsigned int __cdecl pcap_sendqueue_transmit(struct pcap *,struct pcap_send_queue *,int)" (?pcap_sendqueue_transmit@@YAIPAUpcap@@PAUpcap_send_queue@@H at Z) referenced in function _main
SendQWin32 error LNK2019: unresolved external symbol "void __cdecl pcap_sendqueue_destroy(struct pcap_send_queue *)" (?pcap_sendqueue_destroy@@YAXPAUpcap_send_queue@@@Z) referenced in function _main
I might be totally wrong, but it sounds like I am missing out some #include directives...
Thanks in advance,
Marta
Gianluca Varenni <gianluca.varenni at cacetech.com> wrote:
Marta,
it's a known bug in the documentation (due to a "const" qualifier that was added to the prototype of pcap_next_ex(), without reflecting the change to the samples).
Here is the patch to solve your problem (marked with <------)
int caplen,
sync;
u_int res;
pcap_send_queue *squeue;
struct pcap_pkthdr *pktheader;
const u_char *pktdata; <------
/* Check the validity of the command line */
if (argc <= 2 || argc >= 5)
{
usage();
return 0;
}
Have a nice day
GV
----- Original Message -----
From: Marta Perez
To: winpcap-users at winpcap.org
Sent: Monday, May 01, 2006 7:03 AM
Subject: [Winpcap-users] Compilation Error - Send queues
Hello everybody,
I am having problems with the compilation of the example code found in:
http://www.winpcap.org/docs/man/html/group__wpcap__tut8.html
Precisely, the first example (sendpacket()) is fine; the problem is with send queues' code example. I tried both VS 6.0 and .NET2003. These are the errors I am getting:
VS6.0:
error C2664: 'pcap_next_ex' : cannot convert parameter 3 from 'unsigned char ** ' to 'const unsigned char ** '
Conversion loses qualifiers
.NET2003:
error C2664: 'pcap_next_ex' : cannot convert parameter 3 from 'u_char **__w64 ' to 'const u_char ** '
The code is exactly the one in the tutorial because I usually start by getting the example code to work and then modify what needs to be modified.
I am really working in .NET2003, but I also tried VS6.0 just to make sure it was not a small mistake I might have overlooked. Any help with be greatly appreciated,
Marta
P.S: Just in case, here it is my code
#include "stdafx.h"
#include <stdlib.h>
#include <stdio.h>
#include <pcap.h>
#include <Win32-Extensions.h>
#include <remote-ext.h>
void usage();
int _tmain(int argc, _TCHAR* argv[])
{
pcap_t *indesc,*outdesc;
char error[PCAP_ERRBUF_SIZE];
FILE *capfile;
int caplen,
sync;
u_int res;
pcap_send_queue *squeue;
struct pcap_pkthdr *pktheader;
u_char *pktdata;
/* Check the validity of the command line */
if (argc <= 2 || argc >= 5)
{
usage();
return 0;
}
/* Retrieve the length of the capture file */
capfile=fopen(argv[1],"rb");
if(!capfile){
printf("Capture file not found!\n");
return 0;
}
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 */
if((indesc = pcap_open_offline(argv[1], error)) == NULL){
fprintf(stderr,"\nError opening the input file: %s\n", error);
return 0;
}
/* Open the output adapter */
if((outdesc = pcap_open_live(argv[2], 100, 1, 1000, error) ) == NULL)
{
fprintf(stderr,"\nError opening adapter: %s\n", error);
return 0;
}
/* 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;
}
}
if(res == -1){
printf("Corrupted input file.\n");
pcap_sendqueue_destroy(squeue);
return 0;
}
/* Transmit the queue */
if((res = pcap_sendqueue_transmit(outdesc, squeue, sync)) < squeue->len)
{
printf("An error occurred sending the packets: %s. Only %d bytes were sent\n", error, res);
}
/* free the send queue */
pcap_sendqueue_destroy(squeue);
return 0;
}
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);
}
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