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/* A simple server to attach to
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
static const char *name;
static int Socket(int p)
{
struct sockaddr_in addr;
int sock_fd;
if ((sock_fd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror("socket");
exit(EXIT_FAILURE);
}
/* Bind port to address
*/
addr.sin_family=AF_INET;
addr.sin_addr.s_addr=INADDR_ANY;
addr.sin_port=htons(p);
if (bind(sock_fd,(void*)&addr,sizeof(addr))==-1)
{
perror("bind");
exit(EXIT_FAILURE);
}
if (listen(sock_fd,5)==-1)
{
perror("listen");
exit(EXIT_FAILURE);
}
return sock_fd;
}
int main(int argc, char *argv[])
{
struct sockaddr_in addr;
char buff[1024];
int len;
int addrlen;
int sock_fd;
int connect_fd;
name=argv[0];
if (argc!=2)
{
fprintf(stderr,"%s: usage %s port\n", name, name);
exit(1);
}
sock_fd = Socket((short)atoi(argv[1]));
printf("%s: socket bound\n",name);
while(1)
{
printf("%s: accepting\n",name);
if ((connect_fd=accept(sock_fd,NULL,0))==-1)
{
perror("accept");
exit(1);
}
addrlen=sizeof(addr);
if (getsockname(connect_fd,(void*)&addr,&addrlen)!=0)
{
perror("getsockname");
}
printf("%s: connection ON port %d\n",name,ntohs(addr.sin_port));
addrlen=sizeof(addr);
if (getpeername(connect_fd,(void*)&addr,&addrlen)!=0)
{
perror("getpeername");
}
printf("%s: connection FROM port %d\n",name,ntohs(addr.sin_port));
while((len=read(connect_fd,buff,1024))>0)
{
buff[len]=0;
printf("%s: recieved '%s'\n",name,buff);
}
if (len == -1)
{
perror("read");
}
close(connect_fd);
}
return EXIT_SUCCESS;
}
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