socket_client.c

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#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include "proxylib.h"
#include "echo.h"

int ns_errno;

void str_cli(FILE *, int);

int main(int argc, char **argv)
{
  int sockfd;
  struct sockaddr_in servaddr;

  if (argc != 3) {
    fprintf(stderr, "usage: tcpcli <IPaddress> <port>");
    exit(-1);
  }

  sockfd = socket(AF_INET, SOCK_STREAM, 0);

  memset(&servaddr, 0x0, sizeof(servaddr));
  servaddr.sin_family = AF_INET;
  servaddr.sin_port = htons(atoi(argv[2]));
  inet_pton(AF_INET, argv[1], &servaddr.sin_addr);

  connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));

  str_cli(stdin, sockfd);   /* do it all */

  exit(0);
}

void str_cli(FILE * fp, int sockfd)
{
  char sendline[MAXLINE], recvline[MAXLINE];

  while (fgets(sendline, MAXLINE, fp) != NULL) {

    Writen(sockfd, sendline, strlen(sendline));

    if (Readline(sockfd, recvline, MAXLINE) == 0) {
      fprintf(stderr, "str_cli: server terminated prematurely");
      return;
    }

    fputs(recvline, stdout);
  }
}