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/* $FreeBSD$ */
/*
* lsock.c (C) 1995-1998 Darren Reed
*
* See the IPFILTER.LICENCE file for details on licencing.
*
*/
#if !defined(lint)
static const char sccsid[] = "@(#)lsock.c 1.2 1/11/96 (C)1995 Darren Reed";
static const char rcsid[] = "@(#)$Id: lsock.c,v 2.3.4.1 2006/03/17 13:45:34 darrenr Exp $";
#endif
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/dir.h>
#define __KERNEL__
#if LINUX >= 0200
# undef UINT_MAX
# undef INT_MAX
# undef ULONG_MAX
# undef LONG_MAX
# include <linux/notifier.h>
#endif
#include <linux/fs.h>
#if LINUX >= 0200
#include "linux/netdevice.h"
#include "net/sock.h"
#endif
#undef __KERNEL__
#include <linux/sched.h>
#include <linux/netdevice.h>
#include <nlist.h>
#include <sys/user.h>
#include <sys/socket.h>
#include <math.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <net/if.h>
#if LINUX < 0200
#include <net/inet/sock.h>
#endif
#include "ipsend.h"
int nproc;
struct task_struct *proc;
#ifndef KMEM
# ifdef _PATH_KMEM
# define KMEM _PATH_KMEM
# endif
#endif
#ifndef KMEM
# define KMEM "/dev/kmem"
#endif
#ifndef KERNEL
# define KERNEL "/System.map"
#endif
int kmemcpy(buf, pos, n)
char *buf;
void *pos;
int n;
{
static int kfd = -1;
if (kfd == -1)
kfd = open(KMEM, O_RDONLY);
if (lseek(kfd, (off_t)pos, SEEK_SET) == -1)
{
perror("lseek");
return -1;
}
if (read(kfd, buf, n) == -1)
{
perror("read");
return -1;
}
return n;
}
struct nlist names[3] = {
{ "_task" },
{ "_nr_tasks" },
{ NULL }
};
struct task_struct *getproc()
{
struct task_struct *p, **pp;
void *v;
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 task_struct *);
if (KMCPY(&v, names[0].n_value, sizeof(v)) == -1)
{
fprintf(stderr, "read(%#x,%#x,%d) proc\n",
names[0].n_value, &v, sizeof(v));
return NULL;
}
pp = (struct task_struct **)malloc(siz);
if (KMCPY(pp, v, siz) == -1)
{
fprintf(stderr, "read(%#x,%#x,%d) proc\n",
v, pp, siz);
return NULL;
}
proc = (struct task_struct *)malloc(siz);
for (n = 0; n < NR_TASKS; n++)
{
if (KMCPY((proc + n), pp[n], sizeof(*proc)) == -1)
{
fprintf(stderr, "read(%#x,%#x,%d) proc\n",
pp[n], proc + n, sizeof(*proc));
return NULL;
}
}
p = proc;
for (n = NR_TASKS; n; n--, p++)
if (p->pid == pid)
break;
if (!n)
return NULL;
return p;
}
struct sock *find_tcp(fd, ti)
int fd;
struct tcpiphdr *ti;
{
struct sock *s;
struct inode *i;
struct files_struct *fs;
struct task_struct *p;
struct file *f, **o;
if (!(p = getproc()))
return NULL;
fs = p->files;
o = (struct file **)calloc(1, sizeof(*o) * (fs->count + 1));
if (KMCPY(o, fs->fd, (fs->count + 1) * sizeof(*o)) == -1)
{
fprintf(stderr, "read(%#x,%#x,%d) - fd - failed\n",
fs->fd, 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",
o[fd], f, sizeof(*f));
return NULL;
}
i = (struct inode *)calloc(1, sizeof(*i));
if (KMCPY(i, f->f_inode, sizeof(*i)) == -1)
{
fprintf(stderr, "read(%#x,%#x,%d) - f_inode - failed\n",
f->f_inode, i, sizeof(*i));
return NULL;
}
return i->u.socket_i.data;
}
int do_socket(dev, mtu, ti, gwip)
char *dev;
int mtu;
struct tcpiphdr *ti;
struct in_addr gwip;
{
struct sockaddr_in rsin, lsin;
struct sock *s, sk;
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, 0);
if (nfd == -1)
return -1;
if (!(s = 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(&sk, s, sizeof(sk));
ti->ti_win = sk.window;
ti->ti_seq = sk.sent_seq - 1;
ti->ti_ack = sk.rcv_ack_seq;
ti->ti_flags = TH_SYN;
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;
}
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