sock.c revision 109123 
1/* $FreeBSD: head/contrib/ipfilter/ipsend/sock.c 109123 2003-01-12 01:37:13Z dillon $ */
2/*
3 * sock.c (C) 1995-1998 Darren Reed
4 *
5 * See the IPFILTER.LICENCE file for details on licencing.
6 */
7#ifdef __sgi
8# include <sys/ptimers.h>
9#endif
10#include <stdio.h>
11#include <unistd.h>
12#include <string.h>
13#include <stdlib.h>
14#include <stddef.h>
15#include <pwd.h>
16#include <sys/types.h>
17#include <sys/time.h>
18#include <sys/param.h>
19#include <sys/stat.h>
20#ifndef	ultrix
21#include <fcntl.h>
22#endif
23#if (__FreeBSD_version >= 300000)
24# include <sys/dirent.h>
25#else
26# include <sys/dir.h>
27#endif
28#define _KERNEL
29#define	KERNEL
30#ifdef	ultrix
31# undef	LOCORE
32# include <sys/smp_lock.h>
33#endif
34#include <sys/file.h>
35#undef  _KERNEL
36#undef  KERNEL
37#include <nlist.h>
38#include <sys/user.h>
39#include <sys/socket.h>
40#include <sys/socketvar.h>
41#include <sys/proc.h>
42#if !defined(ultrix) && !defined(hpux)
43# include <kvm.h>
44#endif
45#ifdef sun
46#include <sys/systm.h>
47#include <sys/session.h>
48#endif
49#if BSD >= 199103
50#include <sys/sysctl.h>
51#include <sys/filedesc.h>
52#include <paths.h>
53#endif
54#include <math.h>
55#include <netinet/in.h>
56#include <netinet/in_systm.h>
57#include <netinet/ip.h>
58#include <netinet/tcp.h>
59#include <net/if.h>
60#include <net/route.h>
61#include <netinet/ip_var.h>
62#include <netinet/in_pcb.h>
63#include <netinet/tcp_timer.h>
64#include <netinet/tcp_var.h>
65#include "ipsend.h"
66
67#if !defined(lint)
68static const char sccsid[] = "@(#)sock.c	1.2 1/11/96 (C)1995 Darren Reed";
69static const char rcsid[] = "@(#)$Id: sock.c,v 2.1.4.5 2002/02/22 15:32:58 darrenr Exp $";
70#endif
71
72
73int	nproc;
74struct	proc	*proc;
75
76#ifndef	KMEM
77# ifdef	_PATH_KMEM
78#  define	KMEM	_PATH_KMEM
79# endif
80#endif
81#ifndef	KERNEL
82# ifdef	_PATH_UNIX
83#  define	KERNEL	_PATH_UNIX
84# endif
85#endif
86#ifndef	KMEM
87# define	KMEM	"/dev/kmem"
88#endif
89#ifndef	KERNEL
90# define	KERNEL	"/vmunix"
91#endif
92
93
94#if BSD < 199103
95static	struct	proc	*getproc __P((void));
96#else
97static	struct	kinfo_proc	*getproc __P((void));
98#endif
99
100
101int	kmemcpy(buf, pos, n)
102char	*buf;
103void	*pos;
104int	n;
105{
106	static	int	kfd = -1;
107	off_t	offset = (u_long)pos;
108
109	if (kfd == -1)
110		kfd = open(KMEM, O_RDONLY);
111
112	if (lseek(kfd, offset, SEEK_SET) == -1)
113	    {
114		perror("lseek");
115		return -1;
116	    }
117	if (read(kfd, buf, n) == -1)
118	    {
119		perror("read");
120		return -1;
121	    }
122	return n;
123}
124
125struct	nlist	names[4] = {
126	{ "_proc" },
127	{ "_nproc" },
128#ifdef	ultrix
129	{ "_u" },
130#else
131	{ NULL },
132#endif
133	{ NULL }
134	};
135
136#if BSD < 199103
137static struct proc *getproc()
138{
139	struct	proc	*p;
140	pid_t	pid = getpid();
141	int	siz, n;
142
143	n = nlist(KERNEL, names);
144	if (n != 0)
145	    {
146		fprintf(stderr, "nlist(%#x) == %d\n", names, n);
147		return NULL;
148	    }
149	if (KMCPY(&nproc, names[1].n_value, sizeof(nproc)) == -1)
150	    {
151		fprintf(stderr, "read nproc (%#x)\n", names[1].n_value);
152		return NULL;
153	    }
154	siz = nproc * sizeof(struct proc);
155	if (KMCPY(&p, names[0].n_value, sizeof(p)) == -1)
156	    {
157		fprintf(stderr, "read(%#x,%#x,%d) proc\n",
158			names[0].n_value, &p, sizeof(p));
159		return NULL;
160	    }
161	proc = (struct proc *)malloc(siz);
162	if (KMCPY(proc, p, siz) == -1)
163	    {
164		fprintf(stderr, "read(%#x,%#x,%d) proc\n",
165			p, proc, siz);
166		return NULL;
167	    }
168
169	p = proc;
170
171	for (n = nproc; n; n--, p++)
172		if (p->p_pid == pid)
173			break;
174	if (!n)
175		return NULL;
176
177	return p;
178}
179
180
181struct	tcpcb	*find_tcp(fd, ti)
182int	fd;
183struct	tcpiphdr *ti;
184{
185	struct	tcpcb	*t;
186	struct	inpcb	*i;
187	struct	socket	*s;
188	struct	user	*up;
189	struct	proc	*p;
190	struct	file	*f, **o;
191
192	if (!(p = getproc()))
193		return NULL;
194	up = (struct user *)malloc(sizeof(*up));
195#ifndef	ultrix
196	if (KMCPY(up, p->p_uarea, sizeof(*up)) == -1)
197	    {
198		fprintf(stderr, "read(%#x,%#x) failed\n", p, p->p_uarea);
199		return NULL;
200	    }
201#else
202	if (KMCPY(up, names[2].n_value, sizeof(*up)) == -1)
203	    {
204		fprintf(stderr, "read(%#x,%#x) failed\n", p, names[2].n_value);
205		return NULL;
206	    }
207#endif
208
209	o = (struct file **)calloc(1, sizeof(*o) * (up->u_lastfile + 1));
210	if (KMCPY(o, up->u_ofile, (up->u_lastfile + 1) * sizeof(*o)) == -1)
211	    {
212		fprintf(stderr, "read(%#x,%#x,%d) - u_ofile - failed\n",
213			up->u_ofile, o, sizeof(*o));
214		return NULL;
215	    }
216	f = (struct file *)calloc(1, sizeof(*f));
217	if (KMCPY(f, o[fd], sizeof(*f)) == -1)
218	    {
219		fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n",
220			up->u_ofile[fd], f, sizeof(*f));
221		return NULL;
222	    }
223
224	s = (struct socket *)calloc(1, sizeof(*s));
225	if (KMCPY(s, f->un_data.socket, sizeof(*s)) == -1)
226	    {
227		fprintf(stderr, "read(%#x,%#x,%d) - f_data - failed\n",
228			o[fd], s, sizeof(*s));
229		return NULL;
230	    }
231
232	i = (struct inpcb *)calloc(1, sizeof(*i));
233	if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
234	    {
235		fprintf(stderr, "kvm_read(%#x,%#x,%d) - so_pcb - failed\n",
236			s->so_pcb, i, sizeof(*i));
237		return NULL;
238	    }
239
240	t = (struct tcpcb *)calloc(1, sizeof(*t));
241	if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
242	    {
243		fprintf(stderr, "read(%#x,%#x,%d) - inp_ppcb - failed\n",
244			i->inp_ppcb, t, sizeof(*t));
245		return NULL;
246	    }
247	return (struct tcpcb *)i->inp_ppcb;
248}
249#else
250static struct kinfo_proc *getproc()
251{
252	static	struct	kinfo_proc kp;
253	pid_t	pid = getpid();
254	int	mib[4];
255	size_t	n;
256
257	mib[0] = CTL_KERN;
258	mib[1] = KERN_PROC;
259	mib[2] = KERN_PROC_PID;
260	mib[3] = pid;
261
262	n = sizeof(kp);
263	if (sysctl(mib, 4, &kp, &n, NULL, 0) == -1)
264	    {
265		perror("sysctl");
266		return NULL;
267	    }
268	return &kp;
269}
270
271
272struct	tcpcb	*find_tcp(tfd, ti)
273int	tfd;
274struct	tcpiphdr *ti;
275{
276	struct	tcpcb	*t;
277	struct	inpcb	*i;
278	struct	socket	*s;
279	struct	filedesc	*fd;
280	struct	kinfo_proc	*p;
281	struct	file	*f, **o;
282
283	if (!(p = getproc()))
284		return NULL;
285
286	fd = (struct filedesc *)malloc(sizeof(*fd));
287#if defined( __FreeBSD_version) && __FreeBSD_version >= 500013
288	if (KMCPY(fd, p->ki_fd, sizeof(*fd)) == -1)
289	    {
290		fprintf(stderr, "read(%#lx,%#lx) failed\n",
291			(u_long)p, (u_long)p->ki_fd);
292		return NULL;
293	    }
294#else
295	if (KMCPY(fd, p->kp_proc.p_fd, sizeof(*fd)) == -1)
296	    {
297		fprintf(stderr, "read(%#lx,%#lx) failed\n",
298			(u_long)p, (u_long)p->kp_proc.p_fd);
299		return NULL;
300	    }
301#endif
302
303	o = (struct file **)calloc(1, sizeof(*o) * (fd->fd_lastfile + 1));
304	if (KMCPY(o, fd->fd_ofiles, (fd->fd_lastfile + 1) * sizeof(*o)) == -1)
305	    {
306		fprintf(stderr, "read(%#lx,%#lx,%lu) - u_ofile - failed\n",
307			(u_long)fd->fd_ofiles, (u_long)o, (u_long)sizeof(*o));
308		return NULL;
309	    }
310	f = (struct file *)calloc(1, sizeof(*f));
311	if (KMCPY(f, o[tfd], sizeof(*f)) == -1)
312	    {
313		fprintf(stderr, "read(%#lx,%#lx,%lu) - o[tfd] - failed\n",
314			(u_long)o[tfd], (u_long)f, (u_long)sizeof(*f));
315		return NULL;
316	    }
317
318	s = (struct socket *)calloc(1, sizeof(*s));
319	if (KMCPY(s, f->un_data.socket, sizeof(*s)) == -1)
320	    {
321		fprintf(stderr, "read(%#lx,%#lx,%lu) - f_data - failed\n",
322			(u_long)f->un_data.socket, (u_long)s,
323			(u_long)sizeof(*s));
324		return NULL;
325	    }
326
327	i = (struct inpcb *)calloc(1, sizeof(*i));
328	if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
329	    {
330		fprintf(stderr, "kvm_read(%#lx,%#lx,%lu) - so_pcb - failed\n",
331			(u_long)s->so_pcb, (u_long)i, (u_long)sizeof(*i));
332		return NULL;
333	    }
334
335	t = (struct tcpcb *)calloc(1, sizeof(*t));
336	if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
337	    {
338		fprintf(stderr, "read(%#lx,%#lx,%lu) - inp_ppcb - failed\n",
339			(u_long)i->inp_ppcb, (u_long)t, (u_long)sizeof(*t));
340		return NULL;
341	    }
342	return (struct tcpcb *)i->inp_ppcb;
343}
344#endif /* BSD < 199301 */
345
346int	do_socket(dev, mtu, ti, gwip)
347char	*dev;
348int	mtu;
349struct	tcpiphdr *ti;
350struct	in_addr	gwip;
351{
352	struct	sockaddr_in	rsin, lsin;
353	struct	tcpcb	*t, tcb;
354	int	fd, nfd, len;
355
356	printf("Dest. Port: %d\n", ti->ti_dport);
357
358	fd = socket(AF_INET, SOCK_STREAM, 0);
359	if (fd == -1)
360	    {
361		perror("socket");
362		return -1;
363	    }
364
365	if (fcntl(fd, F_SETFL, FNDELAY) == -1)
366	    {
367		perror("fcntl");
368		return -1;
369	    }
370
371	bzero((char *)&lsin, sizeof(lsin));
372	lsin.sin_family = AF_INET;
373	bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr,
374	      sizeof(struct in_addr));
375	if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1)
376	    {
377		perror("bind");
378		return -1;
379	    }
380	len = sizeof(lsin);
381	(void) getsockname(fd, (struct sockaddr *)&lsin, &len);
382	ti->ti_sport = lsin.sin_port;
383	printf("sport %d\n", ntohs(lsin.sin_port));
384	nfd = initdevice(dev, ntohs(lsin.sin_port), 1);
385
386	if (!(t = find_tcp(fd, ti)))
387		return -1;
388
389	bzero((char *)&rsin, sizeof(rsin));
390	rsin.sin_family = AF_INET;
391	bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr,
392	      sizeof(struct in_addr));
393	rsin.sin_port = ti->ti_dport;
394	if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 &&
395	    errno != EINPROGRESS)
396	    {
397		perror("connect");
398		return -1;
399	    }
400	KMCPY(&tcb, t, sizeof(tcb));
401	ti->ti_win = tcb.rcv_adv;
402	ti->ti_seq = tcb.snd_nxt - 1;
403	ti->ti_ack = tcb.rcv_nxt;
404
405	if (send_tcp(nfd, mtu, (ip_t *)ti, gwip) == -1)
406		return -1;
407	(void)write(fd, "Hello World\n", 12);
408	sleep(2);
409	close(fd);
410	return 0;
411}
412