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POProblem with IP_HDRINCL?
 

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  1. POProblem with IP_HDRINCL?
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    <p>I already asked this question on raw IP packet implementation. But I didn't get any solutions.</p> <h3>My code:</h3> <pre><code>if((s = WSASocket(AF_INET, SOCK_RAW, IPPROTO_TCP, 0, 0, 0))==SOCKET_ERROR) // Socket { printf("Creation of raw socket failed."); return 0; } if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&amp;optval, sizeof(optval))==SOCKET_ERROR) { printf("failed to set socket in raw mode."); return 0; } if((sendto(s ,(char *) buf , sizeof(IPV4_HDR)+sizeof(TCP_HDR) + payload, 0,(SOCKADDR *)&amp;dest, sizeof(dest)))==SOCKET_ERROR) { printf("Error sending Packet : %d",WSAGetLastError()); break; } </code></pre> <h3>Error:</h3> <p>WSAGetLastError() returns 10022: </p> <h3>Description:</h3> <p>An invalid argument (for example, an argument that specified an invalid level) was supplied to the setsockopt (Wsapiref_94aa.asp) function. Sometimes, it also refers to the current state of the sockets, for example, calling accept (Wsapiref_13aq.asp) on a socket that is not listening. </p> <h3>Commentary:</h3> <p>But I have set the correct option value and size.</p> <p>What am I doing wrong? I am using Windows XP (SP3). In setsocketopt I tried IP_OPTIONS for that program it works fine and it sends IP Packets too. But in ethereal for every IP packet it generates ICMP packets from the destination. </p> <p>How can I fix this?</p> <p><strong>Source code</strong>:</p> <p>//raw tcp packet crafter</p> <pre><code>#include "stdio.h" #include "winsock2.h" #include "ws2tcpip.h" //IP_HDRINCL is here #include "conio.h" 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, *PIPV4_HDR, FAR * LPIPV4_HDR; // TCP header typedef struct tcp_header { unsigned short source_port; // source port unsigned short dest_port; // destination port unsigned int sequence; // sequence number - 32 bits unsigned int acknowledge; // acknowledgement number - 32 bits unsigned char ns :1; //Nonce Sum Flag Added in RFC 3540. unsigned char reserved_part1:3; //according to rfc unsigned char data_offset:4; /*The number of 32-bit words in the TCP header. This indicates where the data begins. The length of the TCP header is always a multiple of 32 bits.*/ unsigned char fin :1; //Finish Flag unsigned char syn :1; //Synchronise Flag unsigned char rst :1; //Reset Flag unsigned char psh :1; //Push Flag unsigned char ack :1; //Acknowledgement Flag unsigned char urg :1; //Urgent Flag unsigned char ecn :1; //ECN-Echo Flag unsigned char cwr :1; //Congestion Window Reduced Flag //////////////////////////////// unsigned short window; // window unsigned short checksum; // checksum unsigned short urgent_pointer; // urgent pointer } TCP_HDR , *PTCP_HDR , FAR * LPTCP_HDR , TCPHeader , TCP_HEADER; int main() { char host[100],buf[1000],*data=NULL,source_ip[20]; //buf is the complete packet SOCKET s; int k=1; IPV4_HDR *v4hdr=NULL; TCP_HDR *tcphdr=NULL; int payload=512 ; int optval= 1; SOCKADDR_IN dest; hostent *server; //Initialise Winsock WSADATA wsock; printf("\nInitialising Winsock..."); if (WSAStartup(MAKEWORD(2,2),&amp;wsock) != 0) { fprintf(stderr,"WSAStartup() failed"); exit(EXIT_FAILURE); } printf("Initialised successfully."); //////////////////////////////////////////////// //Create Raw TCP Packet printf("\nCreating Raw TCP Socket..."); if((s = WSASocket(AF_INET, SOCK_RAW, IPPROTO_TCP, 0, 0, 0))==SOCKET_ERROR) { printf("Creation of raw socket failed."); return 0; } printf("Raw TCP Socket Created successfully."); //////////////////////////////////////////////// //Put Socket in RAW Mode. printf("\nSetting the socket in RAW mode..."); if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&amp;optval, sizeof(optval))==SOCKET_ERROR) { printf("failed to set socket in raw mode."); return 0; } printf("Successful."); //////////////////////////////////////////////// //Target Hostname printf("\nEnter hostname : "); gets(host); printf("\nResolving Hostname..."); if((server=gethostbyname(host))==0) { printf("Unable to resolve."); return 0; } dest.sin_family = AF_INET; dest.sin_port = htons(8888); //your destination port memcpy(&amp;dest.sin_addr.s_addr,server-&gt;h_addr,server-&gt;h_length); printf("Resolved."); ///////////////////////////////////////////////// printf("\nEnter Source IP : "); gets(source_ip); v4hdr = (IPV4_HDR *)buf; //lets point to the ip header portion v4hdr-&gt;ip_version=4; v4hdr-&gt;ip_header_len=5; v4hdr-&gt;ip_tos = 0; v4hdr-&gt;ip_total_length = htons ( sizeof(IPV4_HDR) + sizeof(TCP_HDR) + payload ); v4hdr-&gt;ip_id = htons(2); v4hdr-&gt;ip_frag_offset = 0; v4hdr-&gt;ip_frag_offset1 = 0; v4hdr-&gt;ip_reserved_zero = 0; v4hdr-&gt;ip_dont_fragment = 1; v4hdr-&gt;ip_more_fragment = 0; v4hdr-&gt;ip_ttl = 8; v4hdr-&gt;ip_protocol = IPPROTO_TCP; v4hdr-&gt;ip_srcaddr = inet_addr(source_ip); v4hdr-&gt;ip_destaddr = inet_addr(inet_ntoa(dest.sin_addr)); v4hdr-&gt;ip_checksum = 0; tcphdr = (TCP_HDR *)&amp;buf[sizeof(IPV4_HDR)]; //get the pointer to the tcp header in the packet tcphdr-&gt;source_port = htons(1234); tcphdr-&gt;dest_port = htons(8888); tcphdr-&gt;cwr=0; tcphdr-&gt;ecn=1; tcphdr-&gt;urg=0; tcphdr-&gt;ack=0; tcphdr-&gt;psh=0; tcphdr-&gt;rst=1; tcphdr-&gt;syn=0; tcphdr-&gt;fin=0; tcphdr-&gt;ns=1; tcphdr-&gt;checksum = 0; // Initialize the TCP payload to some rubbish data = &amp;buf[sizeof(IPV4_HDR) + sizeof(TCP_HDR)]; memset(data, '^', payload); printf("\nSending packet...\n"); while(!_kbhit()) { printf(" %d packets send\r",k++); if((sendto(s ,(char *) buf , sizeof(IPV4_HDR)+sizeof(TCP_HDR) + payload, 0,(SOCKADDR *)&amp;dest, sizeof(dest)))==SOCKET_ERROR) { printf("Error sending Packet : %d",WSAGetLastError()); break; } } return 0; } </code></pre>
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    1. USkrishnakumar
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      1. POProblem with IP_HDRINCL?
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    1. COIt would help if you also showed the definition of the option value, "optval".
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      1. POProblem with IP_HDRINCL?
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    2. COint optval=1 ; is it actually int type or boolean type?
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      1. POProblem with IP_HDRINCL?
      1. USkrishnakumar
    3. COlet me send the complete code
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