[Prototype]IRC Bot made in C

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#include    <stdio.h> #include    <stdlib.h> #include    <string.h> #include    <unistd.h> #include    <arpa/inet.h> #include    <sys/types.h> #include    <sys/socket.h> #include    <netdb.h>   void    error_handling( char *message ); void    response( char *recv ); void    pong ( char *ping );   #define MAX 8192   int     sockfd;     int     main( int argc, char *argv[] ) {     const   char    address[64]    =   "irc.hanirc.org";       char    nickname[64]    =   "Luna_bot";     char    channel[64]     =   "#프겔";       int     port            =   6664;       struct  sockaddr_in sock;     struct  hostent     *host_st;       char    rcv_data[MAX]  =   {0x00, };     char    send[1024]      =   {0x00, };       char    *ping;       host_st     =   gethostbyname( address );     if( host_st == NULL)     {         error_handling( "gethostbyname() error" );     }       sockfd      =   socket( AF_INET, SOCK_STREAM, 0 );     if( sockfd == -1 )     {         error_handling( "socket() error" );     }       memset( &sock, 0x0, sizeof(sock) );     sock.sin_family     =   AF_INET;     sock.sin_port       =   htons( port );     sock.sin_addr       =   *((struct in_addr*)host_st->h_addr);       if( connect( sockfd, (struct sockaddr *)&sock, sizeof(sock) ) == -1 )     {         error_handling( "connect() error" );     }       strncpy( send, "NICK Luna_bot \n", sizeof(send) - 1 );     printf( "Request : %s", send);     write( sockfd, send, strlen(send) );     memset( send, 0x0, sizeof(send) );       strncpy( send, "USER iam5duck \"naver.com\" \"irc.hanric.org\" : Luna\n", sizeof(send) -1 );     printf( "Request : %s\n", send);     write( sockfd, send, strlen(send) );     memset( send, 0x0, sizeof(send) );       read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );       read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );       strncpy( send, "NICK Luna_bot \n", sizeof(send) - 1 );     printf( "Request : %s", send);     write( sockfd, send, strlen(send) );     memset( send, 0x0, sizeof(send) );       /*    read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );     */     read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );       strncpy( send, "USERHOST LaLuna\n", sizeof(send) - 1 );     printf( "Request : %s", send);     write( sockfd, send, strlen(send) );     memset( send, 0x0, sizeof(send) );       read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );       read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );       strncpy( send, "JOIN #프갤\n", sizeof(send) - 1 );     printf( "Request : %s", send );     write( sockfd, send, strlen(send) );       read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );       read( sockfd, rcv_data, sizeof(rcv_data) );     response( rcv_data );     memset( rcv_data, 0x0, sizeof( rcv_data ) );       strncpy( send, "PRIVMSG #프갤 :HI I'am LaLuna Bot\n", sizeof(send) - 1 );     printf( "Request : %s", send );     write( sockfd, send, strlen(send) );     memset( send, 0x0, sizeof( send ) );       while( 1 )     {         read( sockfd, rcv_data, sizeof(rcv_data) );         response( rcv_data );           if( strstr( rcv_data, "!out" ) )         {             memset(send, 0x0, sizeof(send) );             strncpy( send, "PRIVMSG #프갤 :Luna_bot 갑니다 ㅂ2ㅂ2\n", sizeof(send) - 1 );             break;         }           if( strstr( rcv_data, "Luna_bot" ) )         {             strncpy( send, "PRIVMSG #프갤 :I am so hot, 난 너무 예뻐요\n ", sizeof(send) -1 );             write( sockfd, send, strlen( send ) );             memset( send, 0x0, sizeof( send ) );         }         memset( rcv_data, 0x0, sizeof( rcv_data ) );     }       close( sockfd );     return 0; }   void    error_handling( char *message ) {     fputs( message, stderr );     fputc( '\n', stderr );     exit( 1 ); }   void    response( char *recv ) {     char    temp[MAX];     char    *parsing;     char    *ping;       printf( "-----------------------------------------------\n");     strncpy( temp, recv, sizeof(temp) - 1);       parsing     =   strtok( temp, "\n");       while( parsing != NULL )     {         if( parsing )   printf( "Response : %s\n", parsing );         if( (strstr( parsing, "PING " )) != NULL )         {             pong( parsing );         }         parsing =   strtok( NULL, "\n" );     }     printf( "-----------------------------------------------\n"); }   void    pong( char *ping ) {     char    temp[MAX]  =   {0x00, };     char    *parsing;       strncpy( temp, ping, strlen( ping ) + 1 );     parsing     =   strtok( temp, "\n" );     memcpy( parsing, "PONG", 4 );       printf( "PINGPONG : %s\n", parsing );     write( sockfd, parsing, strlen( parsing ) + 1 ); }