Using winsock2.h in C, but what do the following errors mean?
I am going to paste here my code and errors:
#include "stdio.h"
#include "winsock2.h"
#define SIO_RCVALL _WSAIOW(IOC_VENDOR,1) //this removes the need of mstcpip.h
void StartSniffing (SOCKET Sock); //This will sniff here and there
void ProcessPacket (unsigned char* , int); //This will decide how to digest
void PrintIpHeader (unsigned char* , int);
void PrintUdpPacket (unsigned char* , int);
void ConvertToHex (unsigned char* , unsigned int);
void PrintData (unsigned char* , int);
//IP Header Structure
typedef struct ip_hdr
{
unsigned char ip_header_len:4; // 4-bit header length (in 32-bit words) normally=5 (Means 20 Bytes may be 24 also)
unsigned char ip_version :4; // 4-bit IPv4 version
unsigned char ip_tos; // IP type of service
unsigned short ip_total_length; // Total length
unsigned short ip_id; // Unique identifier
unsigned char ip_frag_offset :5; // Fragment offset field
unsigned char ip_more_fragment :1;
unsigned char ip_dont_fragment :1;
unsigned char ip_reserved_zero :1;
unsigned char ip_frag_offset1; //fragment offset
unsigned char ip_ttl; // Time to live
unsigned char ip_protocol; // Protocol(TCP,UDP etc)
unsigned short ip_checksum; // IP checksum
unsigned int ip_srcaddr; // Source address
unsigned int ip_destaddr; // Source address
} IPV4_HDR;
//UDP Header Structure
typedef struct udp_hdr
{
unsigned short source_port; // Source port no.
unsigned short dest_port; // Dest. port no.
unsigned short udp_length; // Udp packet length
unsigned short udp_checksum; // Udp checksum (optional)
} UDP_HDR;
//ICMP Header Structure
typedef struct icmp_hdr
{
BYTE type; // ICMP Error type
BYTE code; // Type sub code
USHORT checksum;
USHORT id;
USHORT seq;
} ICMP_HDR;
FILE *logfile;
int tcp=0,udp=0,icmp=0,others=0,igmp=0,total=0,i,j;
struct sockaddr_in source,dest;
char hex[2];
//Its free!
IPV4_HDR *iphdr;
UDP_HDR *udpheader;
int main()
{
SOCKET sniffer;
struct in_addr addr;
int in;
char hostname[100];
struct hostent *local;
WSADATA wsa;
//logfile=fopen("log.txt","w");
//if(logfile==NULL) printf("Unable to create file.");
//Initialise Winsock
printf("nInitialising Winsock...");
if (WSAStartup(MAKEWORD(2,2), &wsa) != 0)
{
printf("WSAStartup() failed.n");
return 1;
}
printf("Initialised");
//Create a RAW Socket
printf("nCreating RAW Socket...");
sniffer = socket(AF_INET, SOCK_RAW, IPPROTO_IP);
if (sniffer == INVALID_SOCKET)
{
printf("Failed to create raw socket.n");
return 1;
}
printf("Created.");
//Retrieve the local hostname
if (gethostname(hostname, sizeof(hostname)) == SOCKET_ERROR)
{
printf("Error : %d",WSAGetLastError());
return 1;
}
printf("nHost name : %s n",hostname);
//Retrieve the available IPs of the local host
local = gethostbyname(hostname);
printf("nAvailable Network Interfaces : n");
if (local == NULL)
{
printf("Error : %d.n",WSAGetLastError());
return 1;
}
for (i = 0; local->h_addr_list[i] != 0; ++i)
{
memcpy(&addr, local->h_addr_list[i], sizeof(struct in_addr));
printf("Interface Number : %d Address : %sn",i,inet_ntoa(addr));
}
printf("Enter the interface number you would like to sniff : ");
scanf("%d",&in);
memset(&dest, 0, sizeof(dest));
memcpy(&dest.sin_addr.s_addr, local->h_addr_list[in], sizeof(dest.sin_addr.s_addr));
dest.sin_family = AF_INET;
dest.sin_port = 0;
printf("nBinding socket to local system and port 0 ...");
if (bind(sniffer,(struct sockaddr *)&dest,sizeof(dest)) == SOCKET_ERROR)
{
printf("bind(%s) failed.n", inet_ntoa(addr));
return 1;
}
printf("Binding successful");
//Enable this socket with the power to sniff : SIO_RCVALL is the key Receive ALL ;)
j=1;
printf("nSetting socket to sniff...");
if (WSAIoctl(sniffer, SIO_RCVALL,&j, sizeof(j), 0, 0,(LPDWORD)&in,0, 0) == SOCKET_ERROR)
{
printf("WSAIoctl() failed.n");
return 1;
}
printf("Socket set.");
//Begin
printf("nStarted Sniffingn");
printf("Packet Capture Statistics...n");
StartSniffing(sniffer); //Happy Sniffing
//End
closesocket(sniffer);
WSACleanup();
return 0;
}
void StartSniffing(SOCKET sniffer)
{
unsigned char *Buffer = ( unsigned char *)malloc(65536); //Its Big!
int mangobyte;
if (Buffer == NULL)
{
printf("malloc() failed.n");
return;
}
do
{
mangobyte = recvfrom(sniffer,(char *)Buffer,65536,0,0,0); //Eat as much as u can
if(mangobyte > 0) ProcessPacket(Buffer, mangobyte);
else printf( "recvfrom() failed.n");
}
while (mangobyte > 0);
free(Buffer);
}
void ProcessPacket(unsigned char* Buffer, int Size)
{
iphdr = (IPV4_HDR *)Buffer;
++total;
switch (iphdr->ip_protocol) //Check the Protocol and do accordingly...
{
case 1: //ICMP Protocol
++icmp;
//PrintIcmpPacket(Buffer,Size);
break;
case 2: //IGMP Protocol
++igmp;
break;
case 6: //TCP Protocol
++tcp;
//PrintTcpPacket(Buffer,Size);
break;
case 17: //UDP Protocol
++udp;
PrintUdpPacket(Buffer,Size);
break;
default: //Some Other Protocol like ARP etc.
++others;
break;
}
printf("TCP : %d UDP : %d ICMP : %d IGMP : %d Others : %d Total : %dr",tcp,udp,icmp,igmp,others,total);
}
void PrintIpHeader (unsigned char* Buffer, int Size)
{
unsigned short iphdrlen;
iphdr = (IPV4_HDR *)Buffer;
iphdrlen = iphdr->ip_header_len*4;
memset(&source, 0, sizeof(source));
source.sin_addr.s_addr = iphdr->ip_srcaddr;
memset(&dest, 0, sizeof(dest));
dest.sin_addr.s_addr = iphdr->ip_destaddr;
fprintf(logfile,"n");
fprintf(logfile,"IP Headern");
fprintf(logfile," |-IP Version : %dn",(unsigned int)iphdr->ip_version);
fprintf(logfile," |-IP Header Length : %d DWORDS or %d Bytesn",(unsigned int)iphdr->ip_header_len);
fprintf(logfile," |-Type Of Service : %dn",(unsigned int)iphdr->ip_tos);
fprintf(logfile," |-IP Total Length : %d Bytes(Size of Packet)n",ntohs(iphdr->ip_total_length));
fprintf(logfile," |-Identification : %dn",ntohs(iphdr->ip_id));
fprintf(logfile," |-Reserved ZERO Field : %dn",(unsigned int)iphdr->ip_reserved_zero);
fprintf(logfile," |-Dont Fragment Field : %dn",(unsigned int)iphdr->ip_dont_fragment);
fprintf(logfile," |-More Fragment Field : %dn",(unsigned int)iphdr->ip_more_fragment);
fprintf(logfile," |-TTL : %dn",(unsigned int)iphdr->ip_ttl);
fprintf(logfile," |-Protocol : %dn",(unsigned int)iphdr->ip_protocol);
fprintf(logfile," |-Checksum : %dn",ntohs(iphdr->ip_checksum));
fprintf(logfile," |-Source IP : %sn",inet_ntoa(source.sin_addr));
fprintf(logfile," |-Destination IP : %sn",inet_ntoa(dest.sin_addr));
}
void PrintUdpPacket(unsigned char *Buffer,int Size)
{
unsigned short iphdrlen;
iphdr = (IPV4_HDR *)Buffer;
iphdrlen = iphdr->ip_header_len*4;
udpheader = (UDP_HDR *)(Buffer + iphdrlen);
fprintf(logfile,"nn***********************UDP Packet*************************n");
PrintIpHeader(Buffer,Size);
fprintf(logfile,"nUDP Headern");
fprintf(logfile," |-Source Port : %dn",ntohs(udpheader->source_port));
fprintf(logfile," |-Destination Port : %dn",ntohs(udpheader->dest_port));
fprintf(logfile," |-UDP Length : %dn",ntohs(udpheader->udp_length));
fprintf(logfile," |-UDP Checksum : %dn",ntohs(udpheader->udp_checksum));
fprintf(logfile,"n");
fprintf(logfile,"IP Headern");
PrintData(Buffer,iphdrlen);
fprintf(logfile,"UDP Headern");
PrintData(Buffer+iphdrlen,sizeof(UDP_HDR));
fprintf(logfile,"Data Payloadn");
PrintData(Buffer+iphdrlen+sizeof(UDP_HDR), (Size - sizeof(UDP_HDR) - iphdr->ip_header_len*4));
fprintf(logfile,"n###########################################################");
}
void PrintData (unsigned char* data , int Size)
{
for(i=0 ; i < Size ; i++)
{
if( i!=0 && i%16==0) //if one line of hex printing is complete...
{
fprintf(logfile," ");
for(j=i-16 ; j<i ; j++)
{
if(data[j]>=32 && data[j]<=128)
fprintf(logfile,"%c",(unsigned char)data[j]); //if its a number or alphabet
else fprintf(logfile,"."); //otherwise print a dot
}
fprintf(logfile,"n");
}
if(i%16==0) fprintf(logfile," ");
fprintf(logfile," %02X",(unsigned int)data[i]);
if( i==Size-1) //print the last spaces
{
for(j=0;j<15-i%16;j++) fprintf(logfile," "); //extra spaces
fprintf(logfile," ");
for(j=i-i%16 ; j<=i ; j++)
{
if(data[j]>=32 && data[j]<=128) fprintf(logfile,"%c",(unsigned char)data[j]);
else fprintf(logfile,".");
}
fprintf(logfile,"n");
}
}
}
Following are the errors
Error 1 error LNK2019: unresolved external symbol __imp__WSACleanup@0 referenced in function _main sniffer.obj sniffer test Error 2 error LNK2019: unresolved external symbol __imp__closesocket@4 referenced in function _main sniffer.obj sniffer test Error 3 error LNK2019: unresolved external symbol __imp__WSAIoctl@36 referenced in function _main sniffer.obj sniffer test Error 4 error LNK2019: unresolved external symbol __imp__bind@12 referenced in function _main sniffer.obj sniffer test Error 5 error LNK2019: unresolved external symbol __imp__inet_ntoa@4 referenced in function _main sniffer.obj sniffer test Error 6 error LNK2019: unresolved external symbol __imp__gethostbyname@4 referenced in function _main sniffer.obj sniffer test Error 7 error LNK2019: unresolved external symbol __imp__WSAGetLastError@0 referenced in function _main sniffer.obj sniffer test Error 8 error LNK2019: unresolved external symbol __imp__gethostname@8 referenced in function _main sniffer.obj sniffer test Error 9 error LNK2019: unresolved external symbol __imp__socket@12 referenced in function _main sniffer.obj sniffer test Error 10 error LNK2019: unresolved external symbol __imp__WSAStartup@8 referenced in function _main sniffer.obj sniffer test Error 11 error LNK2019: unresolved external symbol __imp__recvfrom@24 referenced in function "void __cdecl StartSniffing(unsigned int)" (?StartSniffing@@YAXI@Z) sniffer.obj sniffer test Error 12 error LNK2019: unresolved external symbol __imp__ntohs@4 referenced in function "void __cdecl PrintIpHeader(unsigned char *,int)" (?PrintIpHeader@@YAXPAEH@Z) sniffer.obj sniffer test Error 13 fatal error LNK1120: 12 unresolved externals E:CWMsniffer testDebugsniffer test.exe sniffer test
你没有链接到wsock32.lib库。
上一篇: 在C中读取Mat文件