tcp_connect.c

tcp 连接工具

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <unistd.h>
//#define MAX_CON 1025 /* You may have to change this, depending on your OS */
int main(int argc, char *argv[]) {
       if(argc < 4) {
               printf("Usage: %s <host> <port> <MAX_CON>\n", argv[0]);
               exit(-1);
       }
       int MAX_CON;
       char *num=argv[3];
       MAX_CON=atoi(num);
       int sock[MAX_CON];
       int i;
       struct sockaddr_in dest[MAX_CON];
       struct hostent *host;
       if((host = gethostbyname(argv[1])) == -1) {
               printf("Couldn't resolve %s!\n", argv[1]);
               exit(-1);
       }
	   for(i = 0; i <= MAX_CON; i++) {
               if((sock[i] = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
                       printf("Couldn't create socket!\n");
                       exit(-1);
               }

               dest[i].sin_family = AF_INET;
               dest[i].sin_port = htons(atoi(argv[2]));
               dest[i].sin_addr = *((struct in_addr *)host->h_addr);

               if(connect(sock[i], (struct sockaddr *)&dest[i], sizeof(struct sockaddr)) == -1) {
                       printf("Couldn't connect to %s on port %s!\n", argv[1], argv[2]);
                       exit(-1);
               }

             //  printf("%d : Connected!\n", i);
           }
	while(1){}
       return(0);
}