text: /* $FreeBSD: src/contrib/ipfilter/ipsend/sock.c,v 1.16 2005/12/30 11:52:23 guido Exp $ */
  /*
   * sock.c (C) 1995-1998 Darren Reed
   *
   * See the IPFILTER.LICENCE file for details on licencing.
   *
   */
  #if !defined(lint)
  static const char sccsid[] = "@(#)sock.c	1.2 1/11/96 (C)1995 Darren Reed";
  static const char rcsid[] = "@(#)$Id$";
  #endif
  #include <sys/param.h>
  #include <sys/types.h>
  #include <sys/time.h>
  #include <sys/stat.h>
  #ifndef	ultrix
  #include <fcntl.h>
  #endif
  #if (__FreeBSD_version >= 300000)
  # include <sys/dirent.h>
  #else
  # include <sys/dir.h>
  #endif
  #if !defined(__osf__)
  # define _KERNEL
  # define	KERNEL
  # ifdef	ultrix
  #  undef	LOCORE
  #  include <sys/smp_lock.h>
  # endif
  # include <sys/file.h>
  # undef  _KERNEL
  # undef  KERNEL
  #endif
  #include <nlist.h>
  #include <sys/user.h>
  #include <sys/socket.h>
  #include <sys/socketvar.h>
  #include <sys/proc.h>
  #if !defined(ultrix) && !defined(hpux) && !defined(__osf__)
  # include <kvm.h>
  #endif
  #ifdef sun
  #include <sys/systm.h>
  #include <sys/session.h>
  #endif
  #if BSD >= 199103
  #include <sys/sysctl.h>
  #include <sys/filedesc.h>
  #include <paths.h>
  #endif
  #include <math.h>
  #include <netinet/in.h>
  #include <netinet/in_systm.h>
  #include <netinet/ip.h>
  #include <netinet/tcp.h>
  #include <net/if.h>
  #if defined(__FreeBSD__)
  # include "radix_ipf.h"
  #endif
  #include <net/route.h>
  #include <netinet/ip_var.h>
  #include <netinet/in_pcb.h>
  #include <netinet/tcp_timer.h>
  #include <netinet/tcp_var.h>
  #include <stdio.h>
  #include <unistd.h>
  #include <string.h>
  #include <stdlib.h>
  #include <stddef.h>
  #include <pwd.h>
  #include "ipsend.h"
  
  
  int	nproc;
  struct	proc	*proc;
  
  #ifndef	KMEM
  # ifdef	_PATH_KMEM
  #  define	KMEM	_PATH_KMEM
  # endif
  #endif
  #ifndef	KERNEL
  # ifdef	_PATH_UNIX
  #  define	KERNEL	_PATH_UNIX
  # endif
  #endif
  #ifndef	KMEM
  # define	KMEM	"/dev/kmem"
  #endif
  #ifndef	KERNEL
  # define	KERNEL	"/vmunix"
  #endif
  
  
  #if BSD < 199103
  static	struct	proc	*getproc __P((void));
  #else
  static	struct	kinfo_proc	*getproc __P((void));
  #endif
  
  
  int	kmemcpy(buf, pos, n)
  char	*buf;
  void	*pos;
  int	n;
  {
  	static	int	kfd = -1;
  	off_t	offset = (u_long)pos;
  
  	if (kfd == -1)
  		kfd = open(KMEM, O_RDONLY);
  
  	if (lseek(kfd, offset, SEEK_SET) == -1)
  	    {
  		perror("lseek");
  		return -1;
  	    }
  	if (read(kfd, buf, n) == -1)
  	    {
  		perror("read");
  		return -1;
  	    }
  	return n;
  }
  
  struct	nlist	names[4] = {
  	{ "_proc" },
  	{ "_nproc" },
  #ifdef	ultrix
  	{ "_u" },
  #else
  	{ NULL },
  #endif
  	{ NULL }
  	};
  
  #if BSD < 199103
  static struct proc *getproc()
  {
  	struct	proc	*p;
  	pid_t	pid = getpid();
  	int	siz, n;
  
  	n = nlist(KERNEL, names);
  	if (n != 0)
  	    {
  		fprintf(stderr, "nlist(%#x) == %d\n", names, n);
  		return NULL;
  	    }
  	if (KMCPY(&nproc, names[1].n_value, sizeof(nproc)) == -1)
  	    {
  		fprintf(stderr, "read nproc (%#x)\n", names[1].n_value);
  		return NULL;
  	    }
  	siz = nproc * sizeof(struct proc);
  	if (KMCPY(&p, names[0].n_value, sizeof(p)) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x,%d) proc\n",
  			names[0].n_value, &p, sizeof(p));
  		return NULL;
  	    }
  	proc = (struct proc *)malloc(siz);
  	if (KMCPY(proc, p, siz) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x,%d) proc\n",
  			p, proc, siz);
  		return NULL;
  	    }
  
  	p = proc;
  
  	for (n = nproc; n; n--, p++)
  		if (p->p_pid == pid)
  			break;
  	if (!n)
  		return NULL;
  
  	return p;
  }
  
  
  struct	tcpcb	*find_tcp(fd, ti)
  int	fd;
  struct	tcpiphdr *ti;
  {
  	struct	tcpcb	*t;
  	struct	inpcb	*i;
  	struct	socket	*s;
  	struct	user	*up;
  	struct	proc	*p;
  	struct	file	*f, **o;
  
  	if (!(p = getproc()))
  		return NULL;
  	up = (struct user *)malloc(sizeof(*up));
  #ifndef	ultrix
  	if (KMCPY(up, p->p_uarea, sizeof(*up)) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x) failed\n", p, p->p_uarea);
  		return NULL;
  	    }
  #else
  	if (KMCPY(up, names[2].n_value, sizeof(*up)) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x) failed\n", p, names[2].n_value);
  		return NULL;
  	    }
  #endif
  
  	o = (struct file **)calloc(1, sizeof(*o) * (up->u_lastfile + 1));
  	if (KMCPY(o, up->u_ofile, (up->u_lastfile + 1) * sizeof(*o)) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x,%d) - u_ofile - failed\n",
  			up->u_ofile, o, sizeof(*o));
  		return NULL;
  	    }
  	f = (struct file *)calloc(1, sizeof(*f));
  	if (KMCPY(f, o[fd], sizeof(*f)) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n",
  			up->u_ofile[fd], f, sizeof(*f));
  		return NULL;
  	    }
  
  	s = (struct socket *)calloc(1, sizeof(*s));
  	if (KMCPY(s, f->f_data, sizeof(*s)) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x,%d) - f_data - failed\n",
  			o[fd], s, sizeof(*s));
  		return NULL;
  	    }
  
  	i = (struct inpcb *)calloc(1, sizeof(*i));
  	if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
  	    {
  		fprintf(stderr, "kvm_read(%#x,%#x,%d) - so_pcb - failed\n",
  			s->so_pcb, i, sizeof(*i));
  		return NULL;
  	    }
  
  	t = (struct tcpcb *)calloc(1, sizeof(*t));
  	if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
  	    {
  		fprintf(stderr, "read(%#x,%#x,%d) - inp_ppcb - failed\n",
  			i->inp_ppcb, t, sizeof(*t));
  		return NULL;
  	    }
  	return (struct tcpcb *)i->inp_ppcb;
  }
  #else
  static struct kinfo_proc *getproc()
  {
  	static	struct	kinfo_proc kp;
  	pid_t	pid = getpid();
  	int	mib[4];
  	size_t	n;
  
  	mib[0] = CTL_KERN;
  	mib[1] = KERN_PROC;
  	mib[2] = KERN_PROC_PID;
  	mib[3] = pid;
  
  	n = sizeof(kp);
  	if (sysctl(mib, 4, &kp, &n, NULL, 0) == -1)
  	    {
  		perror("sysctl");
  		return NULL;
  	    }
  	return &kp;
  }
  
  
  struct	tcpcb	*find_tcp(tfd, ti)
  int	tfd;
  struct	tcpiphdr *ti;
  {
  	struct	tcpcb	*t;
  	struct	inpcb	*i;
  	struct	socket	*s;
  	struct	filedesc	*fd;
  	struct	kinfo_proc	*p;
  	struct	file	*f, **o;
  
  	if (!(p = getproc()))
  		return NULL;
  
  	fd = (struct filedesc *)malloc(sizeof(*fd));
  #if defined( __FreeBSD_version) && __FreeBSD_version >= 500013
  	if (KMCPY(fd, p->ki_fd, sizeof(*fd)) == -1)
  	    {
  		fprintf(stderr, "read(%#lx,%#lx) failed\n",
  			(u_long)p, (u_long)p->ki_fd);
  		return NULL;
  	    }
  #else
  	if (KMCPY(fd, p->kp_proc.p_fd, sizeof(*fd)) == -1)
  	    {
  		fprintf(stderr, "read(%#lx,%#lx) failed\n",
  			(u_long)p, (u_long)p->kp_proc.p_fd);
  		return NULL;
  	    }
  #endif
  
  	o = (struct file **)calloc(1, sizeof(*o) * (fd->fd_lastfile + 1));
  	if (KMCPY(o, fd->fd_ofiles, (fd->fd_lastfile + 1) * sizeof(*o)) == -1)
  	    {
  		fprintf(stderr, "read(%#lx,%#lx,%lu) - u_ofile - failed\n",
  			(u_long)fd->fd_ofiles, (u_long)o, (u_long)sizeof(*o));
  		return NULL;
  	    }
  	f = (struct file *)calloc(1, sizeof(*f));
  	if (KMCPY(f, o[tfd], sizeof(*f)) == -1)
  	    {
  		fprintf(stderr, "read(%#lx,%#lx,%lu) - o[tfd] - failed\n",
  			(u_long)o[tfd], (u_long)f, (u_long)sizeof(*f));
  		return NULL;
  	    }
  
  	s = (struct socket *)calloc(1, sizeof(*s));
  	if (KMCPY(s, f->f_data, sizeof(*s)) == -1)
  	    {
  		fprintf(stderr, "read(%#lx,%#lx,%lu) - f_data - failed\n",
  			(u_long)f->f_data, (u_long)s,
  			(u_long)sizeof(*s));
  		return NULL;
  	    }
  
  	i = (struct inpcb *)calloc(1, sizeof(*i));
  	if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
  	    {
  		fprintf(stderr, "kvm_read(%#lx,%#lx,%lu) - so_pcb - failed\n",
  			(u_long)s->so_pcb, (u_long)i, (u_long)sizeof(*i));
  		return NULL;
  	    }
  
  	t = (struct tcpcb *)calloc(1, sizeof(*t));
  	if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
  	    {
  		fprintf(stderr, "read(%#lx,%#lx,%lu) - inp_ppcb - failed\n",
  			(u_long)i->inp_ppcb, (u_long)t, (u_long)sizeof(*t));
  		return NULL;
  	    }
  	return (struct tcpcb *)i->inp_ppcb;
  }
  #endif /* BSD < 199301 */
  
  int	do_socket(dev, mtu, ti, gwip)
  char	*dev;
  int	mtu;
  struct	tcpiphdr *ti;
  struct	in_addr	gwip;
  {
  	struct	sockaddr_in	rsin, lsin;
  	struct	tcpcb	*t, tcb;
  	int	fd, nfd, len;
  
  	printf("Dest. Port: %d\n", ti->ti_dport);
  
  	fd = socket(AF_INET, SOCK_STREAM, 0);
  	if (fd == -1)
  	    {
  		perror("socket");
  		return -1;
  	    }
  
  	if (fcntl(fd, F_SETFL, FNDELAY) == -1)
  	    {
  		perror("fcntl");
  		return -1;
  	    }
  
  	bzero((char *)&lsin, sizeof(lsin));
  	lsin.sin_family = AF_INET;
  	bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr,
  	      sizeof(struct in_addr));
  	if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1)
  	    {
  		perror("bind");
  		return -1;
  	    }
  	len = sizeof(lsin);
  	(void) getsockname(fd, (struct sockaddr *)&lsin, &len);
  	ti->ti_sport = lsin.sin_port;
  	printf("sport %d\n", ntohs(lsin.sin_port));
  	nfd = initdevice(dev, 1);
  
  	if (!(t = find_tcp(fd, ti)))
  		return -1;
  
  	bzero((char *)&rsin, sizeof(rsin));
  	rsin.sin_family = AF_INET;
  	bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr,
  	      sizeof(struct in_addr));
  	rsin.sin_port = ti->ti_dport;
  	if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 &&
  	    errno != EINPROGRESS)
  	    {
  		perror("connect");
  		return -1;
  	    }
  	KMCPY(&tcb, t, sizeof(tcb));
  	ti->ti_win = tcb.rcv_adv;
  	ti->ti_seq = tcb.snd_nxt - 1;
  	ti->ti_ack = tcb.rcv_nxt;
  
  	if (send_tcp(nfd, mtu, (ip_t *)ti, gwip) == -1)
  		return -1;
  	(void)write(fd, "Hello World\n", 12);
  	sleep(2);
  	close(fd);
  	return 0;
  }
  