1 /* $NetBSD: sock.c,v 1.5 2018/02/04 08:19:42 mrg Exp $ */
2
3 /*
4 * sock.c (C) 1995-1998 Darren Reed
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 */
9 #if !defined(lint)
10 static __attribute__((__used__)) const char sccsid[] = "@(#)sock.c 1.2 1/11/96 (C)1995 Darren Reed";
11 static __attribute__((__used__)) const char rcsid[] = "@(#)Id: sock.c,v 1.1.1.2 2012/07/22 13:44:38 darrenr";
12 #endif
13 #include <sys/param.h>
14 #include <sys/types.h>
15 #include <sys/time.h>
16 #include <sys/stat.h>
17 #include <stdbool.h>
18 #if defined(__NetBSD__) && defined(__vax__)
19 /*
20 * XXX need to declare boolean_t for _KERNEL <sys/files.h>
21 * which ends up including <sys/device.h> for vax. See PR#32907
22 * for further details.
23 */
24 typedef int boolean_t;
25 #endif
26 #ifndef ultrix
27 #include <fcntl.h>
28 #endif
29 #if (__FreeBSD_version >= 300000)
30 # include <sys/dirent.h>
31 #else
32 # include <sys/dir.h>
33 #endif
34 #if !defined(__osf__)
35 # ifdef __NetBSD__
36 # include <machine/lock.h>
37 # include <sys/mutex.h>
38 # endif
39 # define _KERNEL
40 # define KERNEL
41 # ifdef ultrix
42 # undef LOCORE
43 # include <sys/smp_lock.h>
44 # endif
45 # include <sys/file.h>
46 # undef _KERNEL
47 # undef KERNEL
48 #endif
49 #include <nlist.h>
50 #if defined(__FreeBSD__)
51 #include <sys/user.h>
52 #endif
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/proc.h>
56 #if !defined(ultrix) && !defined(hpux) && !defined(__osf__)
57 # include <kvm.h>
58 #endif
59 #ifdef sun
60 #include <sys/systm.h>
61 #include <sys/session.h>
62 #endif
63 #if BSD >= 199103
64 #include <sys/sysctl.h>
65 #include <sys/filedesc.h>
66 #include <paths.h>
67 #endif
68 #include <math.h>
69 #include <netinet/in.h>
70 #include <netinet/in_systm.h>
71 #include <netinet/ip.h>
72 #include <netinet/tcp.h>
73 #include <net/if.h>
74 #ifndef __osf__
75 # include <net/route.h>
76 #endif
77 #include <netinet/ip_var.h>
78 #include <netinet/in_pcb.h>
79 #include <netinet/tcp_timer.h>
80 #include <netinet/tcp_var.h>
81 #include <stdio.h>
82 #include <unistd.h>
83 #include <string.h>
84 #include <stdlib.h>
85 #include <stddef.h>
86 #include <pwd.h>
87 #include "ipsend.h"
88
89
90 int nproc;
91 struct proc *proc;
92
93 #ifndef KMEM
94 # ifdef _PATH_KMEM
95 # define KMEM _PATH_KMEM
96 # endif
97 #endif
98 #ifndef KERNEL
99 # ifdef _PATH_UNIX
100 # define KERNEL _PATH_UNIX
101 # endif
102 #endif
103 #ifndef KMEM
104 # define KMEM "/dev/kmem"
105 #endif
106 #ifndef KERNEL
107 # define KERNEL "/vmunix"
108 #endif
109
110
111 #if BSD < 199103
112 static struct proc *getproc __P((void));
113 #else
114 static struct kinfo_proc *getproc __P((void));
115 #endif
116
117
kmemcpy(buf,pos,n)118 int kmemcpy(buf, pos, n)
119 char *buf;
120 void *pos;
121 int n;
122 {
123 static int kfd = -1;
124 off_t offset = (u_long)pos;
125
126 if (kfd == -1)
127 kfd = open(KMEM, O_RDONLY);
128
129 if (lseek(kfd, offset, SEEK_SET) == -1)
130 {
131 perror("lseek");
132 return -1;
133 }
134 if (read(kfd, buf, n) == -1)
135 {
136 perror("read");
137 return -1;
138 }
139 return n;
140 }
141
142 struct nlist names[4] = {
143 { "_proc" },
144 { "_nproc" },
145 #ifdef ultrix
146 { "_u" },
147 #else
148 { NULL },
149 #endif
150 { NULL }
151 };
152
153 #if BSD < 199103
getproc()154 static struct proc *getproc()
155 {
156 struct proc *p;
157 pid_t pid = getpid();
158 int siz, n;
159
160 n = nlist(KERNEL, names);
161 if (n != 0)
162 {
163 fprintf(stderr, "nlist(%#x) == %d\n", names, n);
164 return NULL;
165 }
166 if (KMCPY(&nproc, names[1].n_value, sizeof(nproc)) == -1)
167 {
168 fprintf(stderr, "read nproc (%#x)\n", names[1].n_value);
169 return NULL;
170 }
171 siz = nproc * sizeof(struct proc);
172 if (KMCPY(&p, names[0].n_value, sizeof(p)) == -1)
173 {
174 fprintf(stderr, "read(%#x,%#x,%d) proc\n",
175 names[0].n_value, &p, sizeof(p));
176 return NULL;
177 }
178 proc = (struct proc *)malloc(siz);
179 if (KMCPY(proc, p, siz) == -1)
180 {
181 fprintf(stderr, "read(%#x,%#x,%d) proc\n",
182 p, proc, siz);
183 return NULL;
184 }
185
186 p = proc;
187
188 for (n = nproc; n; n--, p++)
189 if (p->p_pid == pid)
190 break;
191 if (!n)
192 return NULL;
193
194 return p;
195 }
196
197
find_tcp(fd,ti)198 struct tcpcb *find_tcp(fd, ti)
199 int fd;
200 struct tcpiphdr *ti;
201 {
202 struct tcpcb *t;
203 struct inpcb *i;
204 struct socket *s;
205 struct user *up;
206 struct proc *p;
207 struct file *f, **o;
208
209 if (!(p = getproc()))
210 return NULL;
211 up = (struct user *)malloc(sizeof(*up));
212 #ifndef ultrix
213 if (KMCPY(up, p->p_uarea, sizeof(*up)) == -1)
214 {
215 fprintf(stderr, "read(%#x,%#x) failed\n", p, p->p_uarea);
216 return NULL;
217 }
218 #else
219 if (KMCPY(up, names[2].n_value, sizeof(*up)) == -1)
220 {
221 fprintf(stderr, "read(%#x,%#x) failed\n", p, names[2].n_value);
222 return NULL;
223 }
224 #endif
225
226 o = (struct file **)calloc(1, sizeof(*o) * (up->u_lastfile + 1));
227 if (KMCPY(o, up->u_ofile, (up->u_lastfile + 1) * sizeof(*o)) == -1)
228 {
229 fprintf(stderr, "read(%#x,%#x,%d) - u_ofile - failed\n",
230 up->u_ofile, o, sizeof(*o));
231 return NULL;
232 }
233 f = (struct file *)calloc(1, sizeof(*f));
234 if (KMCPY(f, o[fd], sizeof(*f)) == -1)
235 {
236 fprintf(stderr, "read(%#x,%#x,%d) - o[fd] - failed\n",
237 up->u_ofile[fd], f, sizeof(*f));
238 return NULL;
239 }
240
241 s = (struct socket *)calloc(1, sizeof(*s));
242 if (KMCPY(s, f->f_data, sizeof(*s)) == -1)
243 {
244 fprintf(stderr, "read(%#x,%#x,%d) - f_data - failed\n",
245 o[fd], s, sizeof(*s));
246 return NULL;
247 }
248
249 i = (struct inpcb *)calloc(1, sizeof(*i));
250 if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
251 {
252 fprintf(stderr, "kvm_read(%#x,%#x,%d) - so_pcb - failed\n",
253 s->so_pcb, i, sizeof(*i));
254 return NULL;
255 }
256
257 t = (struct tcpcb *)calloc(1, sizeof(*t));
258 if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
259 {
260 fprintf(stderr, "read(%#x,%#x,%d) - inp_ppcb - failed\n",
261 i->inp_ppcb, t, sizeof(*t));
262 return NULL;
263 }
264 return (struct tcpcb *)i->inp_ppcb;
265 }
266 #else
getproc()267 static struct kinfo_proc *getproc()
268 {
269 static struct kinfo_proc kp;
270 pid_t pid = getpid();
271 int mib[4];
272 size_t n;
273
274 mib[0] = CTL_KERN;
275 mib[1] = KERN_PROC;
276 mib[2] = KERN_PROC_PID;
277 mib[3] = pid;
278
279 n = sizeof(kp);
280 if (sysctl(mib, 4, &kp, &n, NULL, 0) == -1)
281 {
282 perror("sysctl");
283 return NULL;
284 }
285 return &kp;
286 }
287
288
find_tcp(tfd,ti)289 struct tcpcb *find_tcp(tfd, ti)
290 int tfd;
291 struct tcpiphdr *ti;
292 {
293 struct tcpcb *t;
294 struct inpcb *i;
295 struct socket *s;
296 struct filedesc *fd;
297 struct kinfo_proc *p;
298 struct file *f, **o;
299
300 if (!(p = getproc()))
301 return NULL;
302
303 fd = (struct filedesc *)malloc(sizeof(*fd));
304 if (fd == NULL)
305 return NULL;
306 #if defined( __FreeBSD_version) && __FreeBSD_version >= 500013
307 if (KMCPY(fd, p->ki_fd, sizeof(*fd)) == -1)
308 {
309 fprintf(stderr, "read(%#lx,%#lx) failed\n",
310 (u_long)p, (u_long)p->ki_fd);
311 free(fd);
312 return NULL;
313 }
314 #else
315 if (KMCPY(fd, p->kp_proc.p_fd, sizeof(*fd)) == -1)
316 {
317 fprintf(stderr, "read(%#lx,%#lx) failed\n",
318 (u_long)p, (u_long)p->kp_proc.p_fd);
319 free(fd);
320 return NULL;
321 }
322 #endif
323
324 o = NULL;
325 f = NULL;
326 s = NULL;
327 i = NULL;
328 t = NULL;
329
330 o = (struct file **)calloc(1, sizeof(*o) * (fd->fd_lastfile + 1));
331 #if defined(__NetBSD_Version__) && __NetBSD_Version__ < 599001200
332 if (KMCPY(o, fd->fd_ofiles, (fd->fd_lastfile + 1) * sizeof(*o)) == -1)
333 {
334 fprintf(stderr, "read(%#lx,%#lx,%lu) - u_ofile - failed\n",
335 (u_long)fd->fd_ofiles, (u_long)o, (u_long)sizeof(*o));
336 goto finderror;
337 }
338 #else
339 if (KMCPY(o, &fd->fd_dt->dt_ff, (fd->fd_lastfile + 1) * sizeof(*o)) == -1)
340 {
341 fprintf(stderr, "read(%#lx,%#lx,%lu) - u_ofile - failed\n",
342 (u_long)fd->fd_dt->dt_ff, (u_long)o, (u_long)sizeof(*o));
343 goto finderror;
344 }
345 #endif
346 f = (struct file *)calloc(1, sizeof(*f));
347 if (KMCPY(f, o[tfd], sizeof(*f)) == -1)
348 {
349 fprintf(stderr, "read(%#lx,%#lx,%lu) - o[tfd] - failed\n",
350 (u_long)o[tfd], (u_long)f, (u_long)sizeof(*f));
351 goto finderror;
352 }
353
354 s = (struct socket *)calloc(1, sizeof(*s));
355 if (KMCPY(s, f->f_data, sizeof(*s)) == -1)
356 {
357 fprintf(stderr, "read(%#lx,%#lx,%lu) - f_data - failed\n",
358 (u_long)f->f_data, (u_long)s, (u_long)sizeof(*s));
359 goto finderror;
360 }
361
362 i = (struct inpcb *)calloc(1, sizeof(*i));
363 if (KMCPY(i, s->so_pcb, sizeof(*i)) == -1)
364 {
365 fprintf(stderr, "kvm_read(%#lx,%#lx,%lu) - so_pcb - failed\n",
366 (u_long)s->so_pcb, (u_long)i, (u_long)sizeof(*i));
367 goto finderror;
368 }
369
370 t = (struct tcpcb *)calloc(1, sizeof(*t));
371 if (KMCPY(t, i->inp_ppcb, sizeof(*t)) == -1)
372 {
373 fprintf(stderr, "read(%#lx,%#lx,%lu) - inp_ppcb - failed\n",
374 (u_long)i->inp_ppcb, (u_long)t, (u_long)sizeof(*t));
375 goto finderror;
376 }
377 return (struct tcpcb *)i->inp_ppcb;
378
379 finderror:
380 if (o != NULL)
381 free(o);
382 if (f != NULL)
383 free(f);
384 if (s != NULL)
385 free(s);
386 if (i != NULL)
387 free(i);
388 if (t != NULL)
389 free(t);
390 return NULL;
391 }
392 #endif /* BSD < 199301 */
393
do_socket(dev,mtu,ti,gwip)394 int do_socket(dev, mtu, ti, gwip)
395 char *dev;
396 int mtu;
397 struct tcpiphdr *ti;
398 struct in_addr gwip;
399 {
400 struct sockaddr_in rsin, lsin;
401 struct tcpcb *t, tcb;
402 int fd, nfd;
403 socklen_t len;
404
405 printf("Dest. Port: %d\n", ti->ti_dport);
406
407 fd = socket(AF_INET, SOCK_STREAM, 0);
408 if (fd == -1)
409 {
410 perror("socket");
411 return -1;
412 }
413
414 if (fcntl(fd, F_SETFL, FNDELAY) == -1)
415 {
416 perror("fcntl");
417 return -1;
418 }
419
420 bzero((char *)&lsin, sizeof(lsin));
421 lsin.sin_family = AF_INET;
422 bcopy((char *)&ti->ti_src, (char *)&lsin.sin_addr,
423 sizeof(struct in_addr));
424 if (bind(fd, (struct sockaddr *)&lsin, sizeof(lsin)) == -1)
425 {
426 perror("bind");
427 return -1;
428 }
429 len = sizeof(lsin);
430 (void) getsockname(fd, (struct sockaddr *)&lsin, &len);
431 ti->ti_sport = lsin.sin_port;
432 printf("sport %d\n", ntohs(lsin.sin_port));
433
434 nfd = initdevice(dev, 1);
435 if (nfd == -1)
436 return -1;
437
438 if (!(t = find_tcp(fd, ti)))
439 return -1;
440
441 bzero((char *)&rsin, sizeof(rsin));
442 rsin.sin_family = AF_INET;
443 bcopy((char *)&ti->ti_dst, (char *)&rsin.sin_addr,
444 sizeof(struct in_addr));
445 rsin.sin_port = ti->ti_dport;
446 if (connect(fd, (struct sockaddr *)&rsin, sizeof(rsin)) == -1 &&
447 errno != EINPROGRESS)
448 {
449 perror("connect");
450 return -1;
451 }
452 KMCPY(&tcb, t, sizeof(tcb));
453 ti->ti_win = tcb.rcv_adv;
454 ti->ti_seq = tcb.snd_nxt - 1;
455 ti->ti_ack = tcb.rcv_nxt;
456
457 if (send_tcp(nfd, mtu, (ip_t *)ti, gwip) == -1)
458 return -1;
459 (void)write(fd, "Hello World\n", 12);
460 sleep(2);
461 close(fd);
462 return 0;
463 }
464