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