sock.c revision 89331 
1/* $FreeBSD: head/contrib/ipfilter/ipsend/sock.c 89331 2002-01-14 04:12:54Z alfred $ */
2/*
3 * sock.c (C) 1995-1998 Darren Reed
4 *
5 * See the IPFILTER.LICENCE file for details on licencing.
6 */
7#include <stdio.h>
8#include <unistd.h>
9#include <string.h>
10#include <stdlib.h>
11#include <stddef.h>
12#include <pwd.h>
13#include <sys/types.h>
14#include <sys/time.h>
15#include <sys/param.h>
16#include <sys/stat.h>
17#ifndef	ultrix
18#include <fcntl.h>
19#endif
20#if (__FreeBSD_version >= 300000)
21# include <sys/dirent.h>
22#else
23# include <sys/dir.h>
24#endif
25#define _KERNEL
26#define	KERNEL
27#ifdef	ultrix
28# undef	LOCORE
29# include <sys/smp_lock.h>
30#endif
31#if (__FreeBSD_version >= 500028)
32#include <sys/queue.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 2.1.4.3 2001/07/15 22:00:14 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;
194printf("fl %x ty %x cn %d mc %d\n",
195f->f_flag, f->f_type, f->f_count, f->f_msgcount);
196	up = (struct user *)malloc(sizeof(*up));
197#ifndef	ultrix
198	if (KMCPY(up, p->p_uarea, sizeof(*up)) == -1)
199	    {
200		fprintf(stderr, "read(%#x,%#x) failed\n", p, p->p_uarea);
201		return NULL;
202	    }
203#else
204	if (KMCPY(up, names[2].n_value, sizeof(*up)) == -1)
205	    {
206		fprintf(stderr, "read(%#x,%#x) failed\n", p, names[2].n_value);
207		return NULL;
208	    }
209#endif
210
211	o = (struct file **)calloc(1, sizeof(*o) * (up->u_lastfile + 1));
212	if (KMCPY(o, up->u_ofile, (up->u_lastfile + 1) * sizeof(*o)) == -1)
213	    {
214		fprintf(stderr, "read(%#x,%#x,%d) - u_ofile - failed\n",
215			up->u_ofile, o, sizeof(*o));
216		return NULL;
217	    }
218	f = (struct file *)calloc(1, sizeof(*f));
219	if (KMCPY(f, o[fd], sizeof(*f)) == -1)
220	    {
221		fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n",
222			up->u_ofile[fd], f, sizeof(*f));
223		return NULL;
224	    }
225
226	s = (struct socket *)calloc(1, sizeof(*s));
227	if (KMCPY(s, f->f_data, sizeof(*s)) == -1)
228	    {
229		fprintf(stderr, "read(%#x,%#x,%d) - f_data - failed\n",
230			o[fd], s, sizeof(*s));
231		return NULL;
232	    }
233
234	i = (struct inpcb *)calloc(1, sizeof(*i));
235	if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
236	    {
237		fprintf(stderr, "kvm_read(%#x,%#x,%d) - so_pcb - failed\n",
238			s->so_pcb, i, sizeof(*i));
239		return NULL;
240	    }
241
242	t = (struct tcpcb *)calloc(1, sizeof(*t));
243	if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
244	    {
245		fprintf(stderr, "read(%#x,%#x,%d) - inp_ppcb - failed\n",
246			i->inp_ppcb, t, sizeof(*t));
247		return NULL;
248	    }
249	return (struct tcpcb *)i->inp_ppcb;
250}
251#else
252static struct kinfo_proc *getproc()
253{
254	static	struct	kinfo_proc kp;
255	pid_t	pid = getpid();
256	int	mib[4];
257	size_t	n;
258
259	mib[0] = CTL_KERN;
260	mib[1] = KERN_PROC;
261	mib[2] = KERN_PROC_PID;
262	mib[3] = pid;
263
264	n = sizeof(kp);
265	if (sysctl(mib, 4, &kp, &n, NULL, 0) == -1)
266	    {
267		perror("sysctl");
268		return NULL;
269	    }
270	return &kp;
271}
272
273
274struct	tcpcb	*find_tcp(tfd, ti)
275int	tfd;
276struct	tcpiphdr *ti;
277{
278	struct	tcpcb	*t;
279	struct	inpcb	*i;
280	struct	socket	*s;
281	struct	filedesc	*fd;
282	struct	kinfo_proc	*p;
283	struct	file	*f, **o;
284
285	if (!(p = getproc()))
286		return NULL;
287
288	fd = (struct filedesc *)malloc(sizeof(*fd));
289#if defined( __FreeBSD_version) && __FreeBSD_version >= 500013
290	if (KMCPY(fd, p->ki_fd, sizeof(*fd)) == -1)
291	    {
292		fprintf(stderr, "read(%#lx,%#lx) failed\n",
293			(u_long)p, (u_long)p->ki_fd);
294		return NULL;
295	    }
296#else
297	if (KMCPY(fd, p->kp_proc.p_fd, sizeof(*fd)) == -1)
298	    {
299		fprintf(stderr, "read(%#lx,%#lx) failed\n",
300			(u_long)p, (u_long)p->kp_proc.p_fd);
301		return NULL;
302	    }
303#endif
304
305	o = (struct file **)calloc(1, sizeof(*o) * (fd->fd_lastfile + 1));
306	if (KMCPY(o, fd->fd_ofiles, (fd->fd_lastfile + 1) * sizeof(*o)) == -1)
307	    {
308		fprintf(stderr, "read(%#lx,%#lx,%lu) - u_ofile - failed\n",
309			(u_long)fd->fd_ofiles, (u_long)o, (u_long)sizeof(*o));
310		return NULL;
311	    }
312	f = (struct file *)calloc(1, sizeof(*f));
313	if (KMCPY(f, o[tfd], sizeof(*f)) == -1)
314	    {
315		fprintf(stderr, "read(%#lx,%#lx,%lu) - o[tfd] - failed\n",
316			(u_long)o[tfd], (u_long)f, (u_long)sizeof(*f));
317		return NULL;
318	    }
319
320	s = (struct socket *)calloc(1, sizeof(*s));
321	if (KMCPY(s, f->f_data, sizeof(*s)) == -1)
322	    {
323		fprintf(stderr, "read(%#lx,%#lx,%lu) - f_data - failed\n",
324			(u_long)f->f_data, (u_long)s, (u_long)sizeof(*s));
325		return NULL;
326	    }
327
328	i = (struct inpcb *)calloc(1, sizeof(*i));
329	if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
330	    {
331		fprintf(stderr, "kvm_read(%#lx,%#lx,%lu) - so_pcb - failed\n",
332			(u_long)s->so_pcb, (u_long)i, (u_long)sizeof(*i));
333		return NULL;
334	    }
335
336	t = (struct tcpcb *)calloc(1, sizeof(*t));
337	if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
338	    {
339		fprintf(stderr, "read(%#lx,%#lx,%lu) - inp_ppcb - failed\n",
340			(u_long)i->inp_ppcb, (u_long)t, (u_long)sizeof(*t));
341		return NULL;
342	    }
343	return (struct tcpcb *)i->inp_ppcb;
344}
345#endif /* BSD < 199301 */
346
347int	do_socket(dev, mtu, ti, gwip)
348char	*dev;
349int	mtu;
350struct	tcpiphdr *ti;
351struct	in_addr	gwip;
352{
353	struct	sockaddr_in	rsin, lsin;
354	struct	tcpcb	*t, tcb;
355	int	fd, nfd, len;
356
357	printf("Dest. Port: %d\n", ti->ti_dport);
358
359	fd = socket(AF_INET, SOCK_STREAM, 0);
360	if (fd == -1)
361	    {
362		perror("socket");
363		return -1;
364	    }
365
366	if (fcntl(fd, F_SETFL, FNDELAY) == -1)
367	    {
368		perror("fcntl");
369		return -1;
370	    }
371
372	bzero((char *)&lsin, sizeof(lsin));
373	lsin.sin_family = AF_INET;
374	bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr,
375	      sizeof(struct in_addr));
376	if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1)
377	    {
378		perror("bind");
379		return -1;
380	    }
381	len = sizeof(lsin);
382	(void) getsockname(fd, (struct sockaddr *)&lsin, &len);
383	ti->ti_sport = lsin.sin_port;
384	printf("sport %d\n", ntohs(lsin.sin_port));
385	nfd = initdevice(dev, ntohs(lsin.sin_port), 1);
386
387	if (!(t = find_tcp(fd, ti)))
388		return -1;
389
390	bzero((char *)&rsin, sizeof(rsin));
391	rsin.sin_family = AF_INET;
392	bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr,
393	      sizeof(struct in_addr));
394	rsin.sin_port = ti->ti_dport;
395	if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 &&
396	    errno != EINPROGRESS)
397	    {
398		perror("connect");
399		return -1;
400	    }
401	KMCPY(&tcb, t, sizeof(tcb));
402	ti->ti_win = tcb.rcv_adv;
403	ti->ti_seq = tcb.snd_nxt - 1;
404	ti->ti_ack = tcb.rcv_nxt;
405
406	if (send_tcp(nfd, mtu, (ip_t *)ti, gwip) == -1)
407		return -1;
408	(void)write(fd, "Hello World\n", 12);
409	sleep(2);
410	close(fd);
411	return 0;
412}
413