linux socket source

쓸때마다 매번 찾는게 귀찮아서..

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#include <stdio.h> #include <stdlib.h> #include <arpa inet.h=""> #include <unistd.h> #include <string.h> #include <sys types.h=""> #include <sys socket.h="">   #define SERVER "xxx.xxx.xxx.xxx" #define PORT "xxxx" #define TRUE 1   void error_handling(char *message);   int main(int argc, char **argv) {       int i,sock;       char exploit[]="";       unsigned char recv[512]= {0, };       int str_len;     int option;     socklen_t optlen;           /************* socket initialize and connect ****************/          struct sockaddr_in serv_addr;     sock=socket(PF_INET, SOCK_STREAM, 0);     if(sock == -1)         error_handling("socket() error");       optlen = sizeof(option);     option = TRUE;       setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));     memset(&serv_addr, 0, sizeof(serv_addr));       serv_addr.sin_family=AF_INET;     serv_addr.sin_addr.s_addr=inet_addr(SERVER);     serv_addr.sin_port=htons(atoi(PORT));       if(connect(sock, (struct sockaddr*)&serv_addr,sizeof(serv_addr))<0)         error_handling("connect() error!");       /****************** main start ********************/       if((str_len = read(sock, recv, 64))==0)   //Read 1         error_handling("read() error!");     recv[str_len]=0;     printf("Message from server : %s \n", recv);       if((str_len = read(sock, recv, 64))==0)   //Read 2         error_handling("read() error!");     recv[str_len]=0;     printf("Message from server : %s \n", recv);       if((str_len = write(sock, first, strlen(first))) == -1) ///write 1        error_handling("write() error");           if((str_len = read(sock, recv, 64))==0)  //Read 3         error_handling("read() error!");     recv[str_len]=0;     printf("Message from server : %s \n", recv);        close(sock);     return 0; }   void error_handling(char *message) {     fputs(message, stderr);     fputc('\n', stderr);     exit(1); } </sys></sys></string.h></unistd.h></arpa></stdlib.h></stdio.h>