error: ‘struct tcphdr’ has no member named ‘th_win’

This is a discussion on error: ‘struct tcphdr’ has no member named ‘th_win’ within the C Programming forums, part of the General Programming Boards category; Hello, Sorry for again common thread to repeat. Actually i tried from my maximum but can't get result. So again ...

  1. #1
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    Thumbs down error: ‘struct tcphdr’ has no member named ‘th_win’

    Hello,
    Sorry for again common thread to repeat. Actually i tried from my maximum but can't get result. So again i remember you people. Please give me idea.

    this is the problem...........
    Code:
    tcpg_funcs.c: In function ‘tcpg_hping’:
    tcpg_funcs.c:33: error: ‘struct tcphdr’ has no member named ‘th_dport’
    tcpg_funcs.c:34: error: ‘struct tcphdr’ has no member named ‘th_flags’
    tcpg_funcs.c: In function ‘tcpg_oob’:
    tcpg_funcs.c:43: error: ‘struct tcphdr’ has no member named ‘th_flags’
    tcpg_funcs.c: In function ‘tcpg_portd’:
    tcpg_funcs.c:51: error: ‘struct tcphdr’ has no member named ‘th_dport’
    tcpg_funcs.c: In function ‘tcpg_queso’:
    tcpg_funcs.c:57: error: ‘struct tcphdr’ has no member named ‘th_win’
    tcpg_funcs.c: In function ‘tcpg_synflood’:
    tcpg_funcs.c:65: error: ‘struct tcphdr’ has no member named ‘th_flags’
    tcpg_funcs.c:65: error: ‘struct tcphdr’ has no member named ‘th_flags’
    tcpg_funcs.c:66: error: ‘struct tcphdr’ has no member named ‘th_seq’
    tcpg_funcs.c:66: error: ‘struct tcphdr’ has no member named ‘th_seq’
    tcpg_funcs.c: In function ‘tcpg_syn’:
    tcpg_funcs.c:75: error: ‘struct tcphdr’ has no member named ‘th_flags’
    tcpg_funcs.c:75: error: ‘struct tcphdr’ has no member named ‘th_flags’
    tcpg_funcs.c:76: error: ‘struct tcphdr’ has no member named ‘th_sport’
    tcpg_funcs.c:76: error: ‘struct tcphdr’ has no member named ‘th_dport’
    tcpg_funcs.c: In function ‘tcpg_land’:
    tcpg_funcs.c:82: error: ‘struct tcphdr’ has no member named ‘th_sport’
    tcpg_funcs.c:82: error: ‘struct tcphdr’ has no member named ‘th_dport’
    tcpg_funcs.c: In function ‘tcpg_kill’:
    tcpg_funcs.c:92: error: ‘struct tcphdr’ has no member named ‘th_dport’
    tcpg_funcs.c:93: error: ‘struct tcphdr’ has no member named ‘th_sport’
    tcpg_funcs.c:94: error: ‘struct tcphdr’ has no member named ‘th_dport’
    tcpg_funcs.c:97: error: ‘struct tcphdr’ has no member named ‘th_seq’
    tcpg_funcs.c:98: error: ‘TCP_H’ undeclared (first use in this function)
    tcpg_funcs.c:98: error: (Each undeclared identifier is reported only once
    tcpg_funcs.c:98: error: for each function it appears in.)
    tcpg_funcs.c:98: error: ‘IP_H’ undeclared (first use in this function)
    this is the program
    Header file=====
    Code:
    #define TCPG_SYN
    
    /* Log QUESO probes. */
    #define TCPG_QUESO
    
    /* SYN flooding detection. */
    #define TCPG_SYNFLOOD
    
    /* WinNuke detection. */
    #define TCPG_OOB
    
    /* Log LAND attacks. */
    #define TCPG_LAND
    
    /* Log HPing probes and port 0 connection packets. */
    #define TCPG_HPING
    
    /* Shell daemon default port probe detection. */
    #define TCPG_PORTD
    
    /* Kill connections to TCP port TCPG_KILL. */
    #define TCPG_KILL	110 
    
    /* DON'T CHANGE ANYTHING BELOW THIS LINE !!!!!!!!!!!!!! */
    /* DON'T CHANGE ANYTHING BELOW THIS LINE !!!!!!!!!!!!!! */
    /* DON'T CHANGE ANYTHING BELOW THIS LINE !!!!!!!!!!!!!! */
    
    /* Biggest list of includes you've ever seen, eh?! =;-) */
    #include <libnet.h>
    #include <syslog.h>
    
    /* Why not make all variables global ?! */ 
    struct ippkt {
     struct iphdr ip;
     struct tcphdr tcp;
     char buffer[5000];
    } pkt;
    
    int s, lns;
    struct in_addr src_addr;
    u_char *buff;
    u_int sport, dport;
    
    void tcpg_syn();
    void tcpg_hping();
    void tcpg_synflood();
    void tcpg_portd();
    void tcpg_queso();
    void tcpg_land();
    void tcpg_oob();
    void tcpg_die();
    void tcpg_init();
    void tcpg_kill(u_short);
    C file===

    Code:
    #include "tcpguard.h"
    
    int
    main() {
     tcpg_init();
     
     if(fork()!=0) _exit(0);
     setsid();
    
     syslog(LOG_INFO, "TCPguard made by Nasim Ahmed");
     syslog(LOG_INFO, "launched with pid %d.\n", getpid());
     
     while(1) {
      read(s, (struct ippkt *)&pkt, 5000);
    
      src_addr.s_addr=0;
      src_addr.s_addr=pkt.ip.saddr;
     
    #ifdef TCPG_SYN 
      tcpg_syn();
    #endif
    #ifdef TCPG_HPING
      tcpg_hping();
    #endif
    #ifdef TCPG_QUESO
      tcpg_queso();
    #endif
    #ifdef TCPG_SYNFLOOD
      tcpg_synflood();
    #endif
    #ifdef TCPG_KILL
      tcpg_kill(TCPG_KILL);
    #endif
    #ifdef TCPG_LAND
      tcpg_land();
    #endif
    #ifdef TCPG_OOB
      tcpg_oob();
    #endif
    #ifdef TCPG_PORTD
      tcpg_portd();
    #endif
     }
    }
    Code:
    Problem in here...........
    #include "tcpguard.h"
    
    u_long prev_seq=0;
    
    void tcpg_die() {
     syslog(LOG_INFO, "TCPguard has now found a horrid death.");
      _exit(0);
    } 
    
    void tcpg_init() {
     openlog("tcpguard", 0, LOG_DAEMON);
    
    #ifndef NO_EUID_CHECK
     if(geteuid()!=0) {
      syslog(LOG_INFO, "launched by normal user (uid %d).\n", geteuid());
      printf("This program uses raw sockets. On most systems, that requires root.\n");
      printf("If you know that your systems allows usage of raw sockets by normal\n");
      printf("users, re-compile the program with -DNO_EUID_CHECK.\n");
      _exit(1);
     }
    #endif
    
     if((s=socket(AF_INET, SOCK_RAW, IPPROTO_TCP))==-1) {
      perror("socket()"); _exit(2); }
    }
    
    /* HPing detection. (also makes noise if it finds packets sent to port 0)
     */
    void tcpg_hping() {
     if(pkt.tcp.th_dport==0)
     if(pkt.tcp.th_flags&TH_FIN)
      syslog(LOG_INFO, "WARNING: HPing packet detected from %s !", inet_ntoa(src_addr));
     else syslog(LOG_INFO, "WARNING: Packet to TCP port 0 from %s !", inet_ntoa(src_addr));
    }
    
    /* OOB check... this usually means WinNuke...
     * There still are many kiddies out there who try to winnuke ppl...
     */
    void tcpg_oob() {
     if(pkt.tcp.th_flags&TH_URG)
      syslog(LOG_INFO, "ATTACK: WinNuke attempt from %s !", inet_ntoa(src_addr));
    }
    
    /* A common shell daemon uses 31337 as the default TCP port...
     * Sscan tries to connect to this port...
     */
    void tcpg_portd() {
     if(pkt.tcp.th_dport==htons(31337))
      syslog(LOG_INFO, "WARNING: Backdoor on 31337 probed from %s !", inet_ntoa(src_addr));
    }
    
    /* Queso sends all its packets with a constant window size ... */
    void tcpg_queso() {
     if(pkt.tcp.th_win==htons(4660))
      syslog(LOG_INFO, "ATTACK: A packet probably sent by QUESO was received !");
    }
    
    /* A rather basic detector for a couple of TCP/IP-based attacks.
     * (especially SYN-flooding)
     */
    void tcpg_synflood() {
     if((pkt.tcp.th_flags&TH_SYN)&&(!(pkt.tcp.th_flags&TH_ACK))) 
     if(pkt.tcp.th_seq!=prev_seq) prev_seq=pkt.tcp.th_seq; else {
      syslog(LOG_INFO, "ATTACK: YOU ARE BEING SYN-FLOODED !");
      syslog(LOG_INFO, "ATTACK: YOU ARE BEING SYN-FLOODED !!");
      syslog(LOG_INFO, "ATTACK: YOU ARE BEING SYN-FLOODED !!!");
      tcpg_die();
     }
    }
    
    void tcpg_syn() {
     if((pkt.tcp.th_flags&TH_SYN)&&(!(pkt.tcp.th_flags&TH_ACK)))
      syslog(LOG_INFO, "WARNING: TCP connection attempted from %s:%d to port %d.", inet_ntoa(src_addr), ntohs(pkt.tcp.th_sport), ntohs(pkt.tcp.th_dport));
    }
    
    /* Land attack check.
     */
    void tcpg_land() {
     if((pkt.ip.saddr==pkt.ip.daddr)&&(pkt.tcp.th_sport==pkt.tcp.th_dport))
      syslog(LOG_INFO, "ATTACK: LAND attack detected !!!");
    }
    
    /* Sends a RST to the client...KILLAH !.. =;-) */
    void tcpg_kill(u_short kport) {
     u_long src_ip=0, dst_ip=0, ack;
    
     /* The following kills all TCP connections to port kport ! */
     /* WARNING: This part does not make any checks !!! */
     if(ntohs(pkt.tcp.th_dport)==kport) {
      sport=ntohs(pkt.tcp.th_sport);
      dport=ntohs(pkt.tcp.th_dport);
      src_ip=pkt.ip.daddr;
      dst_ip=pkt.ip.saddr;
      ack=ntohl(pkt.tcp.th_seq)+1;
      buff=malloc(TCP_H+IP_H);
      bzero(buff, TCP_H+IP_H);
      build_ip(TCP_H, IPTOS_LOWDELAY | IPTOS_THROUGHPUT, 242, 0, 64, IPPROTO_TCP, src_ip, dst_ip, NULL, 0, buff);
      build_tcp(sport, dport, ack, ack, TH_RST, 4096, 0, NULL, 0, buff+IP_H);
      do_checksum(buff, IPPROTO_TCP, TCP_H);
      lns=open_raw_sock(IPPROTO_RAW);
      syslog(LOG_INFO, "WARNING: Killing connection from %s to port %d.", inet_ntoa(src_addr), kport);
      write_ip(lns, buff, IP_H+TCP_H);
      close(lns);
     }
    }
    please help me.

  2. #2
    Registered User
    Join Date
    Apr 2008
    Posts
    395
    The error is quite simple: the compiler does not agree with you concerning the definition of
    the tcphdr, so you should try to find out why; this structure is not defined in the
    code you posted.
    A quick search shows that this structure is defined in netinet/tcp.h though, so i guess this
    is the one you're using and the header contains the following conditionals:
    Code:
    # ifdef __FAVOR_BSD
    ...
    struct tcphdr
      {
        u_int16_t th_sport;   /* source port */
        u_int16_t th_dport;   /* destination port */
        tcp_seq th_seq;   /* sequence number */
        ...
    #else
    struct tcphdr
      {
        u_int16_t source;
        u_int16_t dest;
        u_int32_t seq
        ...
    #endif
    So try to define the correct symbols depending on the system you're using.

  3. #3
    Captain Crash brewbuck's Avatar
    Join Date
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    Location
    Portland, OR
    Posts
    7,274
    Quote Originally Posted by root4 View Post
    So try to define the correct symbols depending on the system you're using.
    The right solution is to use the struct format without the th_ part. That is a stupid piece of obsolescence which I wish would die already.

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