lsock.c revision 53024 
1/*
2 * lsock.c (C) 1995-1998 Darren Reed
3 *
4 * Redistribution and use in source and binary forms are permitted
5 * provided that this notice is preserved and due credit is given
6 * to the original author and the contributors.
7 */
8#if !defined(lint)
9static const char sccsid[] = "@(#)lsock.c	1.2 1/11/96 (C)1995 Darren Reed";
10static const char rcsid[] = "@(#)$Id: lsock.c,v 2.1 1999/08/04 17:31:11 darrenr Exp $";
11#endif
12#include <stdio.h>
13#include <unistd.h>
14#include <string.h>
15#include <stdlib.h>
16#include <stddef.h>
17#include <pwd.h>
18#include <sys/types.h>
19#include <sys/time.h>
20#include <sys/param.h>
21#include <sys/stat.h>
22#include <fcntl.h>
23#include <sys/dir.h>
24#define	__KERNEL__
25#if LINUX >= 0200
26# undef UINT_MAX
27# undef INT_MAX
28# undef ULONG_MAX
29# undef LONG_MAX
30# include <linux/notifier.h>
31#endif
32#include <linux/fs.h>
33#if LINUX >= 0200
34#include "linux/netdevice.h"
35#include "net/sock.h"
36#endif
37#undef	__KERNEL__
38#include <linux/sched.h>
39#include <linux/netdevice.h>
40#include <nlist.h>
41#include <sys/user.h>
42#include <sys/socket.h>
43#include <math.h>
44#include <netinet/in.h>
45#include <netinet/in_systm.h>
46#include <net/if.h>
47#if LINUX < 0200
48#include <net/inet/sock.h>
49#endif
50#include "ipsend.h"
51
52int	nproc;
53struct	task_struct	*proc;
54
55#ifndef	KMEM
56# ifdef	_PATH_KMEM
57#  define	KMEM	_PATH_KMEM
58# endif
59#endif
60#ifndef	KMEM
61# define	KMEM	"/dev/kmem"
62#endif
63#ifndef	KERNEL
64# define	KERNEL	"/System.map"
65#endif
66
67int	kmemcpy(buf, pos, n)
68char	*buf;
69void	*pos;
70int	n;
71{
72	static	int	kfd = -1;
73
74	if (kfd == -1)
75		kfd = open(KMEM, O_RDONLY);
76
77	if (lseek(kfd, (off_t)pos, SEEK_SET) == -1)
78	    {
79		perror("lseek");
80		return -1;
81	    }
82	if (read(kfd, buf, n) == -1)
83	    {
84		perror("read");
85		return -1;
86	    }
87	return n;
88}
89
90struct	nlist	names[3] = {
91	{ "_task" },
92	{ "_nr_tasks" },
93	{ NULL }
94	};
95
96struct	task_struct	*getproc()
97{
98	struct	task_struct	*p, **pp;
99	void	*v;
100	pid_t	pid = getpid();
101	int	siz, n;
102
103	n = nlist(KERNEL, names);
104	if (n != 0)
105	    {
106		fprintf(stderr, "nlist(%#x) == %d\n", names, n);
107		return NULL;
108	    }
109	if (KMCPY(&nproc, names[1].n_value, sizeof(nproc)) == -1)
110	    {
111		fprintf(stderr, "read nproc (%#x)\n", names[1].n_value);
112		return NULL;
113	    }
114	siz = nproc * sizeof(struct task_struct *);
115	if (KMCPY(&v, names[0].n_value, sizeof(v)) == -1)
116	    {
117		fprintf(stderr, "read(%#x,%#x,%d) proc\n",
118			names[0].n_value, &v, sizeof(v));
119		return NULL;
120	    }
121	pp = (struct task_struct **)malloc(siz);
122	if (KMCPY(pp, v, siz) == -1)
123	    {
124		fprintf(stderr, "read(%#x,%#x,%d) proc\n",
125			v, pp, siz);
126		return NULL;
127	    }
128	proc = (struct task_struct *)malloc(siz);
129	for (n = 0; n < NR_TASKS; n++)
130	    {
131		if (KMCPY((proc + n), pp[n], sizeof(*proc)) == -1)
132		    {
133			fprintf(stderr, "read(%#x,%#x,%d) proc\n",
134				pp[n], proc + n, sizeof(*proc));
135			return NULL;
136		    }
137	    }
138
139	p = proc;
140
141	for (n = NR_TASKS; n; n--, p++)
142		if (p->pid == pid)
143			break;
144	if (!n)
145		return NULL;
146
147	return p;
148}
149
150
151struct	sock	*find_tcp(fd, ti)
152int	fd;
153struct	tcpiphdr *ti;
154{
155	struct	sock	*s;
156	struct	inode	*i;
157	struct	files_struct	*fs;
158	struct	task_struct	*p;
159	struct	file	*f, **o;
160
161	if (!(p = getproc()))
162		return NULL;
163
164	fs = p->files;
165	o = (struct file **)calloc(1, sizeof(*o) * (fs->count + 1));
166	if (KMCPY(o, fs->fd, (fs->count + 1) * sizeof(*o)) == -1)
167	    {
168		fprintf(stderr, "read(%#x,%#x,%d) - fd - failed\n",
169			fs->fd, o, sizeof(*o));
170		return NULL;
171	    }
172	f = (struct file *)calloc(1, sizeof(*f));
173	if (KMCPY(f, o[fd], sizeof(*f)) == -1)
174	    {
175		fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n",
176			o[fd], f, sizeof(*f));
177		return NULL;
178	    }
179
180	i = (struct inode *)calloc(1, sizeof(*i));
181	if (KMCPY(i, f->f_inode, sizeof(*i)) == -1)
182	    {
183		fprintf(stderr, "read(%#x,%#x,%d) - f_inode - failed\n",
184			f->f_inode, i, sizeof(*i));
185		return NULL;
186	    }
187	return i->u.socket_i.data;
188}
189
190int	do_socket(dev, mtu, ti, gwip)
191char	*dev;
192int	mtu;
193struct	tcpiphdr *ti;
194struct	in_addr	gwip;
195{
196	struct	sockaddr_in	rsin, lsin;
197	struct	sock	*s, sk;
198	int	fd, nfd, len;
199
200	printf("Dest. Port: %d\n", ti->ti_dport);
201
202	fd = socket(AF_INET, SOCK_STREAM, 0);
203	if (fd == -1)
204	    {
205		perror("socket");
206		return -1;
207	    }
208
209	if (fcntl(fd, F_SETFL, FNDELAY) == -1)
210	    {
211		perror("fcntl");
212		return -1;
213	    }
214
215	bzero((char *)&lsin, sizeof(lsin));
216	lsin.sin_family = AF_INET;
217	bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr,
218	      sizeof(struct in_addr));
219	if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1)
220	    {
221		perror("bind");
222		return -1;
223	    }
224	len = sizeof(lsin);
225	(void) getsockname(fd, (struct sockaddr *)&lsin, &len);
226	ti->ti_sport = lsin.sin_port;
227	printf("sport %d\n", ntohs(lsin.sin_port));
228	nfd = initdevice(dev, ntohs(lsin.sin_port), 0);
229
230	if (!(s = find_tcp(fd, ti)))
231		return -1;
232
233	bzero((char *)&rsin, sizeof(rsin));
234	rsin.sin_family = AF_INET;
235	bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr,
236	      sizeof(struct in_addr));
237	rsin.sin_port = ti->ti_dport;
238	if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 &&
239	    errno != EINPROGRESS)
240	    {
241		perror("connect");
242		return -1;
243	    }
244	KMCPY(&sk, s, sizeof(sk));
245	ti->ti_win = sk.window;
246	ti->ti_seq = sk.sent_seq - 1;
247	ti->ti_ack = sk.rcv_ack_seq;
248	ti->ti_flags = TH_SYN;
249
250	if (send_tcp(nfd, mtu, (ip_t *)ti, gwip) == -1)
251		return -1;
252	(void)write(fd, "Hello World\n", 12);
253	sleep(2);
254	close(fd);
255	return 0;
256}
257