error: expected ‘:’, ‘,’, ‘;’, ‘}’ or ‘__attribute__’ before ‘=’ token

This is a discussion on error: expected ‘:’, ‘,’, ‘;’, ‘}’ or ‘__attribute__’ before ‘=’ token within the C Programming forums, part of the General Programming Boards category; how you will deal this two problem................ tcpg.c:78: error: redefinition of ‘struct tcphdr’ tcpg.c:85: error: expected ‘:’, ‘,’, ‘;’, ‘}’ ...

  1. #1
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    Thumbs down error: expected ‘:’, ‘,’, ‘;’, ‘}’ or ‘__attribute__’ before ‘=’ token

    how you will deal this two problem................
    tcpg.c:78: error: redefinition of ‘struct tcphdr’
    tcpg.c:85: error: expected ‘:’, ‘,’, ‘;’, ‘}’ or ‘__attribute__’ before ‘=’ token



    Problem in red--------------------------

    Code:
    #define NO_EUID_CHECK */
      
    /* If you want TCPguard to announce all connection attemps... */
    #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>
    #include <stdio.h>
    #include <stdlib.h>
    #include <errno.h>
    #include <string.h>
    #include <netinet/ip.h>
    #include <netinet/in.h>
    #define __FAVOR_BSD
    #include <netinet/tcp.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);
    
    /******************** Main functions of the TCPguard ***************************/
    # ifdef __FAVOR_BSD
    typedef u_int32_t tcp_seq;
    
    struct tcphdr
      {
        u_int16_t th_sport;         /* source port */
        u_int16_t th_dport;         /* destination port */
        tcp_seq th_seq;             /* sequence number */
        tcp_seq th_ack;             /* acknowledgement number */
    #endif
    
    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);
     }
    }
    /***************************************************************************************/
    int main()
     {
     tcpg_init();
     
     if(fork()!=0)
     _exit(0);
     setsid();
    
     syslog(LOG_INFO, "TCPGUARD");
     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
     }
    }
    /********************************END********************************************************/

  2. #2
    C++ Witch laserlight's Avatar
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    You're missing a closing brace (}) to the struct tcphdr.
    C + C++ Compiler: MinGW port of GCC
    Version Control System: Bazaar

    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    C++まいる!Cをこわせ!
    Join Date
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    On a side note, global variables are discouraged because they are error prone.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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