libtask/echo.c

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2014-08-03 20:59:15 +04:00
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <task.h>
#include <stdlib.h>
#include <sys/socket.h>
enum
{
STACK = 32768
};
static int verbose;
char *server;
void echotask(void*);
int*
mkfd2(int fd1, int fd2)
{
int *a;
a = malloc(2*sizeof a[0]);
if(a == 0){
fprintf(stderr, "out of memory\n");
abort();
}
a[0] = fd1;
a[1] = fd2;
return a;
}
void
taskmain(int argc, char **argv)
{
int cfd, fd;
int rport;
char remote[46];
if(argc != 3){
fprintf(stderr, "usage: tcpproxy server port\n");
taskexitall(1);
}
server = argv[1];
if((fd = netannounce(TCP, 0, atoi(argv[2]))) < 0){
fprintf(stderr, "cannot announce on tcp port %d: %s\n", atoi(argv[1]), strerror(errno));
taskexitall(1);
}
if(fdnoblock(fd) < 0){
fprintf(stderr, "fdnoblock\n");
taskexitall(1);
}
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while((cfd = netaccept(fd, remote, &rport)) >= 0){
if(verbose)
fprintf(stderr, "connection from %s:%d\n", remote, rport);
taskcreate(echotask, (void*)(uintptr_t)cfd, STACK);
}
}
void
echotask(void *v)
{
char buf[512];
int fd, n;
fd = (int)(uintptr_t)v;
while((n = fdread(fd, buf, sizeof buf)) > 0)
fdwrite(fd, buf, n);
close(fd);
}