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socket_wrapper: add ipv6 pcap support
[Samba/gebeck_regimport.git] / lib / socket_wrapper / socket_wrapper.c
blob9527bb5e0eecaedc15b33a53b63c211522054903
1 /*
2 * Copyright (C) Jelmer Vernooij 2005,2008 <jelmer@samba.org>
3 * Copyright (C) Stefan Metzmacher 2006 <metze@samba.org>
4 *
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * 3. Neither the name of the author nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 */
35
36 /*
37 Socket wrapper library. Passes all socket communication over
38 unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
39 is set.
40 */
41
42 #ifdef _SAMBA_BUILD_
43
44 #define SOCKET_WRAPPER_NOT_REPLACE
45 #include "../replace/replace.h"
46 #include "system/network.h"
47 #include "system/filesys.h"
48 #include "system/time.h"
49
50 #else /* _SAMBA_BUILD_ */
51
52 #include <sys/types.h>
53 #include <sys/time.h>
54 #include <sys/stat.h>
55 #include <sys/socket.h>
56 #include <sys/ioctl.h>
57 #include <sys/filio.h>
58 #include <errno.h>
59 #include <sys/un.h>
60 #include <netinet/in.h>
61 #include <netinet/tcp.h>
62 #include <fcntl.h>
63 #include <stdlib.h>
64 #include <unistd.h>
65 #include <string.h>
66 #include <stdio.h>
67 #include <stdint.h>
68
69 #endif
70
71 #ifndef _PUBLIC_
72 #define _PUBLIC_
73 #endif
74
75 #define SWRAP_DLIST_ADD(list,item) do { \
76 if (!(list)) { \
77 (item)->prev = NULL; \
78 (item)->next = NULL; \
79 (list) = (item); \
80 } else { \
81 (item)->prev = NULL; \
82 (item)->next = (list); \
83 (list)->prev = (item); \
84 (list) = (item); \
85 } \
86 } while (0)
87
88 #define SWRAP_DLIST_REMOVE(list,item) do { \
89 if ((list) == (item)) { \
90 (list) = (item)->next; \
91 if (list) { \
92 (list)->prev = NULL; \
93 } \
94 } else { \
95 if ((item)->prev) { \
96 (item)->prev->next = (item)->next; \
97 } \
98 if ((item)->next) { \
99 (item)->next->prev = (item)->prev; \
100 } \
101 } \
102 (item)->prev = NULL; \
103 (item)->next = NULL; \
104 } while (0)
105
106 /* LD_PRELOAD doesn't work yet, so REWRITE_CALLS is all we support
107 * for now */
108 #define REWRITE_CALLS
109
110 #ifdef REWRITE_CALLS
111 #define real_accept accept
112 #define real_connect connect
113 #define real_bind bind
114 #define real_listen listen
115 #define real_getpeername getpeername
116 #define real_getsockname getsockname
117 #define real_getsockopt getsockopt
118 #define real_setsockopt setsockopt
119 #define real_recvfrom recvfrom
120 #define real_sendto sendto
121 #define real_ioctl ioctl
122 #define real_recv recv
123 #define real_send send
124 #define real_socket socket
125 #define real_close close
126 #endif
127
128 #ifdef HAVE_GETTIMEOFDAY_TZ
129 #define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
130 #else
131 #define swrapGetTimeOfDay(tval) gettimeofday(tval)
132 #endif
133
134 /* we need to use a very terse format here as IRIX 6.4 silently
135 truncates names to 16 chars, so if we use a longer name then we
136 can't tell which port a packet came from with recvfrom()
137
138 with this format we have 8 chars left for the directory name
139 */
140 #define SOCKET_FORMAT "%c%02X%04X"
141 #define SOCKET_TYPE_CHAR_TCP 'T'
142 #define SOCKET_TYPE_CHAR_UDP 'U'
143 #define SOCKET_TYPE_CHAR_TCP_V6 'X'
144 #define SOCKET_TYPE_CHAR_UDP_V6 'Y'
145
146 #define MAX_WRAPPED_INTERFACES 16
147
148 #define SW_IPV6_ADDRESS 1
149
150 static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
151 {
152 struct sockaddr *ret = (struct sockaddr *)malloc(len);
153 memcpy(ret, data, len);
154 return ret;
155 }
156
157 static void set_port(int family, int prt, struct sockaddr *addr)
158 {
159 switch (family) {
160 case AF_INET:
161 ((struct sockaddr_in *)addr)->sin_port = htons(prt);
162 break;
163 #ifdef HAVE_IPV6
164 case AF_INET6:
165 ((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
166 break;
167 #endif
168 }
169 }
170
171 static size_t socket_length(int family)
172 {
173 switch (family) {
174 case AF_INET:
175 return sizeof(struct sockaddr_in);
176 #ifdef HAVE_IPV6
177 case AF_INET6:
178 return sizeof(struct sockaddr_in6);
179 #endif
180 }
181 return 0;
182 }
183
184
185
186 struct socket_info
187 {
188 int fd;
189
190 int family;
191 int type;
192 int protocol;
193 int bound;
194 int bcast;
195 int is_server;
196
197 char *path;
198 char *tmp_path;
199
200 struct sockaddr *myname;
201 socklen_t myname_len;
202
203 struct sockaddr *peername;
204 socklen_t peername_len;
205
206 struct {
207 unsigned long pck_snd;
208 unsigned long pck_rcv;
209 } io;
210
211 struct socket_info *prev, *next;
212 };
213
214 static struct socket_info *sockets;
215
216 const char *socket_wrapper_dir(void)
217 {
218 const char *s = getenv("SOCKET_WRAPPER_DIR");
219 if (s == NULL) {
220 return NULL;
221 }
222 if (strncmp(s, "./", 2) == 0) {
223 s += 2;
224 }
225 return s;
226 }
227
228 unsigned int socket_wrapper_default_iface(void)
229 {
230 const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
231 if (s) {
232 unsigned int iface;
233 if (sscanf(s, "%u", &iface) == 1) {
234 if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
235 return iface;
236 }
237 }
238 }
239
240 return 1;/* 127.0.0.1 */
241 }
242
243 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
244 {
245 unsigned int iface;
246 unsigned int prt;
247 const char *p;
248 char type;
249
250 p = strrchr(un->sun_path, '/');
251 if (p) p++; else p = un->sun_path;
252
253 if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
254 errno = EINVAL;
255 return -1;
256 }
257
258 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
259 errno = EINVAL;
260 return -1;
261 }
262
263 if (prt > 0xFFFF) {
264 errno = EINVAL;
265 return -1;
266 }
267
268 switch(type) {
269 case SOCKET_TYPE_CHAR_TCP:
270 case SOCKET_TYPE_CHAR_UDP: {
271 struct sockaddr_in *in2 = (struct sockaddr_in *)in;
272
273 if ((*len) < sizeof(*in2)) {
274 errno = EINVAL;
275 return -1;
276 }
277
278 memset(in2, 0, sizeof(*in2));
279 in2->sin_family = AF_INET;
280 in2->sin_addr.s_addr = htonl((127<<24) | iface);
281 in2->sin_port = htons(prt);
282
283 *len = sizeof(*in2);
284 break;
285 }
286 #ifdef HAVE_IPV6
287 case SOCKET_TYPE_CHAR_TCP_V6:
288 case SOCKET_TYPE_CHAR_UDP_V6: {
289 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)in;
290
291 if ((*len) < sizeof(*in2)) {
292 errno = EINVAL;
293 return -1;
294 }
295
296 memset(in2, 0, sizeof(*in2));
297 in2->sin6_family = AF_INET6;
298 in2->sin6_addr.s6_addr[0] = SW_IPV6_ADDRESS;
299 in2->sin6_port = htons(prt);
300
301 *len = sizeof(*in2);
302 break;
303 }
304 #endif
305 default:
306 errno = EINVAL;
307 return -1;
308 }
309
310 return 0;
311 }
312
313 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
314 int *bcast)
315 {
316 char type = '\0';
317 unsigned int prt;
318 unsigned int iface;
319 int is_bcast = 0;
320
321 if (bcast) *bcast = 0;
322
323 switch (si->family) {
324 case AF_INET: {
325 const struct sockaddr_in *in =
326 (const struct sockaddr_in *)inaddr;
327 unsigned int addr = ntohl(in->sin_addr.s_addr);
328 char u_type = '\0';
329 char b_type = '\0';
330 char a_type = '\0';
331
332 switch (si->type) {
333 case SOCK_STREAM:
334 u_type = SOCKET_TYPE_CHAR_TCP;
335 break;
336 case SOCK_DGRAM:
337 u_type = SOCKET_TYPE_CHAR_UDP;
338 a_type = SOCKET_TYPE_CHAR_UDP;
339 b_type = SOCKET_TYPE_CHAR_UDP;
340 break;
341 }
342
343 prt = ntohs(in->sin_port);
344 if (a_type && addr == 0xFFFFFFFF) {
345 /* 255.255.255.255 only udp */
346 is_bcast = 2;
347 type = a_type;
348 iface = socket_wrapper_default_iface();
349 } else if (b_type && addr == 0x7FFFFFFF) {
350 /* 127.255.255.255 only udp */
351 is_bcast = 1;
352 type = b_type;
353 iface = socket_wrapper_default_iface();
354 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
355 /* 127.0.0.X */
356 is_bcast = 0;
357 type = u_type;
358 iface = (addr & 0x000000FF);
359 } else {
360 errno = ENETUNREACH;
361 return -1;
362 }
363 if (bcast) *bcast = is_bcast;
364 break;
365 }
366 #ifdef HAVE_IPV6
367 case AF_INET6: {
368 const struct sockaddr_in6 *in =
369 (const struct sockaddr_in6 *)inaddr;
370
371 switch (si->type) {
372 case SOCK_STREAM:
373 type = SOCKET_TYPE_CHAR_TCP_V6;
374 break;
375 case SOCK_DGRAM:
376 type = SOCKET_TYPE_CHAR_UDP_V6;
377 break;
378 }
379
380 /* XXX no multicast/broadcast */
381
382 prt = ntohs(in->sin6_port);
383 iface = SW_IPV6_ADDRESS;
384
385 break;
386 }
387 #endif
388 default:
389 errno = ENETUNREACH;
390 return -1;
391 }
392
393 if (prt == 0) {
394 errno = EINVAL;
395 return -1;
396 }
397
398 if (is_bcast) {
399 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
400 socket_wrapper_dir());
401 /* the caller need to do more processing */
402 return 0;
403 }
404
405 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
406 socket_wrapper_dir(), type, iface, prt);
407
408 return 0;
409 }
410
411 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
412 int *bcast)
413 {
414 char type = '\0';
415 unsigned int prt;
416 unsigned int iface;
417 struct stat st;
418 int is_bcast = 0;
419
420 if (bcast) *bcast = 0;
421
422 switch (si->family) {
423 case AF_INET: {
424 const struct sockaddr_in *in =
425 (const struct sockaddr_in *)inaddr;
426 unsigned int addr = ntohl(in->sin_addr.s_addr);
427 char u_type = '\0';
428 char d_type = '\0';
429 char b_type = '\0';
430 char a_type = '\0';
431
432 prt = ntohs(in->sin_port);
433
434 switch (si->type) {
435 case SOCK_STREAM:
436 u_type = SOCKET_TYPE_CHAR_TCP;
437 d_type = SOCKET_TYPE_CHAR_TCP;
438 break;
439 case SOCK_DGRAM:
440 u_type = SOCKET_TYPE_CHAR_UDP;
441 d_type = SOCKET_TYPE_CHAR_UDP;
442 a_type = SOCKET_TYPE_CHAR_UDP;
443 b_type = SOCKET_TYPE_CHAR_UDP;
444 break;
445 }
446
447 if (addr == 0) {
448 /* 0.0.0.0 */
449 is_bcast = 0;
450 type = d_type;
451 iface = socket_wrapper_default_iface();
452 } else if (a_type && addr == 0xFFFFFFFF) {
453 /* 255.255.255.255 only udp */
454 is_bcast = 2;
455 type = a_type;
456 iface = socket_wrapper_default_iface();
457 } else if (b_type && addr == 0x7FFFFFFF) {
458 /* 127.255.255.255 only udp */
459 is_bcast = 1;
460 type = b_type;
461 iface = socket_wrapper_default_iface();
462 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
463 /* 127.0.0.X */
464 is_bcast = 0;
465 type = u_type;
466 iface = (addr & 0x000000FF);
467 } else {
468 errno = EADDRNOTAVAIL;
469 return -1;
470 }
471 break;
472 }
473 #ifdef HAVE_IPV6
474 case AF_INET6: {
475 const struct sockaddr_in6 *in =
476 (const struct sockaddr_in6 *)inaddr;
477
478 switch (si->type) {
479 case SOCK_STREAM:
480 type = SOCKET_TYPE_CHAR_TCP_V6;
481 break;
482 case SOCK_DGRAM:
483 type = SOCKET_TYPE_CHAR_UDP_V6;
484 break;
485 }
486
487 /* XXX no multicast/broadcast */
488
489 prt = ntohs(in->sin6_port);
490 iface = SW_IPV6_ADDRESS;
491
492 break;
493 }
494 #endif
495 default:
496 errno = ENETUNREACH;
497 return -1;
498 }
499
500
501 if (bcast) *bcast = is_bcast;
502
503 if (prt == 0) {
504 /* handle auto-allocation of ephemeral ports */
505 for (prt = 5001; prt < 10000; prt++) {
506 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
507 socket_wrapper_dir(), type, iface, prt);
508 if (stat(un->sun_path, &st) == 0) continue;
509
510 set_port(si->family, prt, si->myname);
511 break;
512 }
513 if (prt == 10000) {
514 errno = ENFILE;
515 return -1;
516 }
517 }
518
519 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
520 socket_wrapper_dir(), type, iface, prt);
521 return 0;
522 }
523
524 static struct socket_info *find_socket_info(int fd)
525 {
526 struct socket_info *i;
527 for (i = sockets; i; i = i->next) {
528 if (i->fd == fd)
529 return i;
530 }
531
532 return NULL;
533 }
534
535 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
536 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
537 {
538 if (!out_addr)
539 return 0;
540
541 out_addr->sun_family = AF_UNIX;
542
543 switch (in_addr->sa_family) {
544 case AF_INET:
545 #ifdef HAVE_IPV6
546 case AF_INET6:
547 #endif
548 switch (si->type) {
549 case SOCK_STREAM:
550 case SOCK_DGRAM:
551 break;
552 default:
553 errno = ESOCKTNOSUPPORT;
554 return -1;
555 }
556 if (alloc_sock) {
557 return convert_in_un_alloc(si, in_addr, out_addr, bcast);
558 } else {
559 return convert_in_un_remote(si, in_addr, out_addr, bcast);
560 }
561 default:
562 break;
563 }
564
565 errno = EAFNOSUPPORT;
566 return -1;
567 }
568
569 static int sockaddr_convert_from_un(const struct socket_info *si,
570 const struct sockaddr_un *in_addr,
571 socklen_t un_addrlen,
572 int family,
573 struct sockaddr *out_addr,
574 socklen_t *out_addrlen)
575 {
576 if (out_addr == NULL || out_addrlen == NULL)
577 return 0;
578
579 if (un_addrlen == 0) {
580 *out_addrlen = 0;
581 return 0;
582 }
583
584 switch (family) {
585 case AF_INET:
586 #ifdef HAVE_IPV6
587 case AF_INET6:
588 #endif
589 switch (si->type) {
590 case SOCK_STREAM:
591 case SOCK_DGRAM:
592 break;
593 default:
594 errno = ESOCKTNOSUPPORT;
595 return -1;
596 }
597 return convert_un_in(in_addr, out_addr, out_addrlen);
598 default:
599 break;
600 }
601
602 errno = EAFNOSUPPORT;
603 return -1;
604 }
605
606 enum swrap_packet_type {
607 SWRAP_CONNECT_SEND,
608 SWRAP_CONNECT_UNREACH,
609 SWRAP_CONNECT_RECV,
610 SWRAP_CONNECT_ACK,
611 SWRAP_ACCEPT_SEND,
612 SWRAP_ACCEPT_RECV,
613 SWRAP_ACCEPT_ACK,
614 SWRAP_RECVFROM,
615 SWRAP_SENDTO,
616 SWRAP_SENDTO_UNREACH,
617 SWRAP_PENDING_RST,
618 SWRAP_RECV,
619 SWRAP_RECV_RST,
620 SWRAP_SEND,
621 SWRAP_SEND_RST,
622 SWRAP_CLOSE_SEND,
623 SWRAP_CLOSE_RECV,
624 SWRAP_CLOSE_ACK
625 };
626
627 struct swrap_file_hdr {
628 uint32_t magic;
629 uint16_t version_major;
630 uint16_t version_minor;
631 int32_t timezone;
632 uint32_t sigfigs;
633 uint32_t frame_max_len;
634 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
635 uint32_t link_type;
636 };
637 #define SWRAP_FILE_HDR_SIZE 24
638
639 struct swrap_packet_frame {
640 uint32_t seconds;
641 uint32_t micro_seconds;
642 uint32_t recorded_length;
643 uint32_t full_length;
644 };
645 #define SWRAP_PACKET_FRAME_SIZE 16
646
647 union swrap_packet_ip {
648 struct {
649 uint8_t ver_hdrlen;
650 uint8_t tos;
651 uint16_t packet_length;
652 uint16_t identification;
653 uint8_t flags;
654 uint8_t fragment;
655 uint8_t ttl;
656 uint8_t protocol;
657 uint16_t hdr_checksum;
658 uint32_t src_addr;
659 uint32_t dest_addr;
660 } v4;
661 #define SWRAP_PACKET_IP_V4_SIZE 20
662 struct {
663 uint8_t ver_prio;
664 uint8_t flow_label_high;
665 uint16_t flow_label_low;
666 uint16_t payload_length;
667 uint8_t next_header;
668 uint8_t hop_limit;
669 uint8_t src_addr[16];
670 uint8_t dest_addr[16];
671 } v6;
672 #define SWRAP_PACKET_IP_V6_SIZE 40
673 };
674 #define SWRAP_PACKET_IP_SIZE 40
675
676 union swrap_packet_payload {
677 struct {
678 uint16_t source_port;
679 uint16_t dest_port;
680 uint32_t seq_num;
681 uint32_t ack_num;
682 uint8_t hdr_length;
683 uint8_t control;
684 uint16_t window;
685 uint16_t checksum;
686 uint16_t urg;
687 } tcp;
688 #define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
689 struct {
690 uint16_t source_port;
691 uint16_t dest_port;
692 uint16_t length;
693 uint16_t checksum;
694 } udp;
695 #define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
696 struct {
697 uint8_t type;
698 uint8_t code;
699 uint16_t checksum;
700 uint32_t unused;
701 } icmp4;
702 #define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
703 struct {
704 uint8_t type;
705 uint8_t code;
706 uint16_t checksum;
707 uint32_t unused;
708 } icmp6;
709 #define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
710 };
711 #define SWRAP_PACKET_PAYLOAD_SIZE 20
712
713 #define SWRAP_PACKET_MIN_ALLOC \
714 (SWRAP_PACKET_FRAME_SIZE + \
715 SWRAP_PACKET_IP_SIZE + \
716 SWRAP_PACKET_PAYLOAD_SIZE)
717
718 static const char *socket_wrapper_pcap_file(void)
719 {
720 static int initialized = 0;
721 static const char *s = NULL;
722 static const struct swrap_file_hdr h;
723 static const struct swrap_packet_frame f;
724 static const union swrap_packet_ip i;
725 static const union swrap_packet_payload p;
726
727 if (initialized == 1) {
728 return s;
729 }
730 initialized = 1;
731
732 /*
733 * TODO: don't use the structs use plain buffer offsets
734 * and PUSH_U8(), PUSH_U16() and PUSH_U32()
735 *
736 * for now make sure we disable PCAP support
737 * if the struct has alignment!
738 */
739 if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
740 return NULL;
741 }
742 if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
743 return NULL;
744 }
745 if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
746 return NULL;
747 }
748 if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
749 return NULL;
750 }
751 if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
752 return NULL;
753 }
754 if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
755 return NULL;
756 }
757 if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
758 return NULL;
759 }
760 if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
761 return NULL;
762 }
763 if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
764 return NULL;
765 }
766 if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
767 return NULL;
768 }
769
770 s = getenv("SOCKET_WRAPPER_PCAP_FILE");
771 if (s == NULL) {
772 return NULL;
773 }
774 if (strncmp(s, "./", 2) == 0) {
775 s += 2;
776 }
777 return s;
778 }
779
780 static uint8_t *swrap_packet_init(struct timeval *tval,
781 const struct sockaddr *src,
782 const struct sockaddr *dest,
783 int socket_type,
784 const uint8_t *payload,
785 size_t payload_len,
786 unsigned long tcp_seqno,
787 unsigned long tcp_ack,
788 unsigned char tcp_ctl,
789 int unreachable,
790 size_t *_packet_len)
791 {
792 uint8_t *base;
793 uint8_t *buf;
794 struct swrap_packet_frame *frame;
795 union swrap_packet_ip *ip;
796 union swrap_packet_payload *pay;
797 size_t packet_len;
798 size_t alloc_len;
799 size_t nonwire_len = sizeof(*frame);
800 size_t wire_hdr_len = 0;
801 size_t wire_len = 0;
802 size_t ip_hdr_len = 0;
803 size_t icmp_hdr_len = 0;
804 size_t icmp_truncate_len = 0;
805 uint8_t protocol = 0, icmp_protocol = 0;
806 const struct sockaddr_in *src_in;
807 const struct sockaddr_in *dest_in;
808 #ifdef HAVE_IPV6
809 const struct sockaddr_in6 *src_in6;
810 const struct sockaddr_in6 *dest_in6;
811 #endif
812 uint16_t src_port;
813 uint16_t dest_port;
814
815 switch (src->sa_family) {
816 case AF_INET:
817 src_in = (const struct sockaddr_in *)src;
818 dest_in = (const struct sockaddr_in *)dest;
819 src_port = src_in->sin_port;
820 dest_port = dest_in->sin_port;
821 ip_hdr_len = sizeof(ip->v4);
822 break;
823 #ifdef HAVE_IPV6
824 case AF_INET6:
825 src_in6 = (const struct sockaddr_in6 *)src;
826 dest_in6 = (const struct sockaddr_in6 *)dest;
827 src_port = src_in6->sin6_port;
828 dest_port = dest_in6->sin6_port;
829 ip_hdr_len = sizeof(ip->v6);
830 break;
831 #endif
832 default:
833 return NULL;
834 }
835
836 switch (socket_type) {
837 case SOCK_STREAM:
838 protocol = 0x06; /* TCP */
839 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
840 wire_len = wire_hdr_len + payload_len;
841 break;
842
843 case SOCK_DGRAM:
844 protocol = 0x11; /* UDP */
845 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
846 wire_len = wire_hdr_len + payload_len;
847 break;
848
849 default:
850 return NULL;
851 }
852
853 if (unreachable) {
854 icmp_protocol = protocol;
855 switch (src->sa_family) {
856 case AF_INET:
857 protocol = 0x01; /* ICMPv4 */
858 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
859 break;
860 #ifdef HAVE_IPV6
861 case AF_INET6:
862 protocol = 0x3A; /* ICMPv6 */
863 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
864 break;
865 #endif
866 }
867 if (wire_len > 64 ) {
868 icmp_truncate_len = wire_len - 64;
869 }
870 wire_hdr_len += icmp_hdr_len;
871 wire_len += icmp_hdr_len;
872 }
873
874 packet_len = nonwire_len + wire_len;
875 alloc_len = packet_len;
876 if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
877 alloc_len = SWRAP_PACKET_MIN_ALLOC;
878 }
879
880 base = (uint8_t *)malloc(alloc_len);
881 if (!base) return NULL;
882
883 buf = base;
884
885 frame = (struct swrap_packet_frame *)buf;
886 frame->seconds = tval->tv_sec;
887 frame->micro_seconds = tval->tv_usec;
888 frame->recorded_length = wire_len - icmp_truncate_len;
889 frame->full_length = wire_len - icmp_truncate_len;
890 buf += SWRAP_PACKET_FRAME_SIZE;
891
892 ip = (union swrap_packet_ip *)buf;
893 switch (src->sa_family) {
894 case AF_INET:
895 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
896 ip->v4.tos = 0x00;
897 ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
898 ip->v4.identification = htons(0xFFFF);
899 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
900 ip->v4.fragment = htons(0x0000);
901 ip->v4.ttl = 0xFF;
902 ip->v4.protocol = protocol;
903 ip->v4.hdr_checksum = htons(0x0000);
904 ip->v4.src_addr = src_in->sin_addr.s_addr;
905 ip->v4.dest_addr = dest_in->sin_addr.s_addr;
906 buf += SWRAP_PACKET_IP_V4_SIZE;
907 break;
908 #ifdef HAVE_IPV6
909 case AF_INET6:
910 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
911 ip->v6.flow_label_high = 0x00;
912 ip->v6.flow_label_low = 0x0000;
913 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
914 ip->v6.next_header = protocol;
915 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
916 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
917 buf += SWRAP_PACKET_IP_V6_SIZE;
918 break;
919 #endif
920 }
921
922 if (unreachable) {
923 pay = (union swrap_packet_payload *)buf;
924 switch (src->sa_family) {
925 case AF_INET:
926 pay->icmp4.type = 0x03; /* destination unreachable */
927 pay->icmp4.code = 0x01; /* host unreachable */
928 pay->icmp4.checksum = htons(0x0000);
929 pay->icmp4.unused = htonl(0x00000000);
930 buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
931
932 /* set the ip header in the ICMP payload */
933 ip = (union swrap_packet_ip *)buf;
934 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
935 ip->v4.tos = 0x00;
936 ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
937 ip->v4.identification = htons(0xFFFF);
938 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
939 ip->v4.fragment = htons(0x0000);
940 ip->v4.ttl = 0xFF;
941 ip->v4.protocol = icmp_protocol;
942 ip->v4.hdr_checksum = htons(0x0000);
943 ip->v4.src_addr = dest_in->sin_addr.s_addr;
944 ip->v4.dest_addr = src_in->sin_addr.s_addr;
945 buf += SWRAP_PACKET_IP_V4_SIZE;
946
947 src_port = dest_in->sin_port;
948 dest_port = src_in->sin_port;
949 break;
950 #ifdef HAVE_IPV6
951 case AF_INET6:
952 pay->icmp6.type = 0x01; /* destination unreachable */
953 pay->icmp6.code = 0x03; /* address unreachable */
954 pay->icmp6.checksum = htons(0x0000);
955 pay->icmp6.unused = htonl(0x00000000);
956 buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
957
958 /* set the ip header in the ICMP payload */
959 ip = (union swrap_packet_ip *)buf;
960 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
961 ip->v6.flow_label_high = 0x00;
962 ip->v6.flow_label_low = 0x0000;
963 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
964 ip->v6.next_header = protocol;
965 memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
966 memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
967 buf += SWRAP_PACKET_IP_V6_SIZE;
968
969 src_port = dest_in6->sin6_port;
970 dest_port = src_in6->sin6_port;
971 break;
972 #endif
973 }
974 }
975
976 pay = (union swrap_packet_payload *)buf;
977
978 switch (socket_type) {
979 case SOCK_STREAM:
980 pay->tcp.source_port = src_port;
981 pay->tcp.dest_port = dest_port;
982 pay->tcp.seq_num = htonl(tcp_seqno);
983 pay->tcp.ack_num = htonl(tcp_ack);
984 pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
985 pay->tcp.control = tcp_ctl;
986 pay->tcp.window = htons(0x7FFF);
987 pay->tcp.checksum = htons(0x0000);
988 pay->tcp.urg = htons(0x0000);
989 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
990
991 break;
992
993 case SOCK_DGRAM:
994 pay->udp.source_port = src_port;
995 pay->udp.dest_port = dest_port;
996 pay->udp.length = htons(8 + payload_len);
997 pay->udp.checksum = htons(0x0000);
998 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
999
1000 break;
1001 }
1002
1003 if (payload && payload_len > 0) {
1004 memcpy(buf, payload, payload_len);
1005 }
1006
1007 *_packet_len = packet_len - icmp_truncate_len;
1008 return base;
1009 }
1010
1011 static int swrap_get_pcap_fd(const char *fname)
1012 {
1013 static int fd = -1;
1014
1015 if (fd != -1) return fd;
1016
1017 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1018 if (fd != -1) {
1019 struct swrap_file_hdr file_hdr;
1020 file_hdr.magic = 0xA1B2C3D4;
1021 file_hdr.version_major = 0x0002;
1022 file_hdr.version_minor = 0x0004;
1023 file_hdr.timezone = 0x00000000;
1024 file_hdr.sigfigs = 0x00000000;
1025 file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
1026 file_hdr.link_type = 0x0065; /* 101 RAW IP */
1027
1028 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1029 close(fd);
1030 fd = -1;
1031 }
1032 return fd;
1033 }
1034
1035 fd = open(fname, O_WRONLY|O_APPEND, 0644);
1036
1037 return fd;
1038 }
1039
1040 static uint8_t *swrap_marshall_packet(struct socket_info *si,
1041 const struct sockaddr *addr,
1042 enum swrap_packet_type type,
1043 const void *buf, size_t len,
1044 size_t *packet_len)
1045 {
1046 const struct sockaddr *src_addr;
1047 const struct sockaddr *dest_addr;
1048 unsigned long tcp_seqno = 0;
1049 unsigned long tcp_ack = 0;
1050 unsigned char tcp_ctl = 0;
1051 int unreachable = 0;
1052
1053 struct timeval tv;
1054
1055 switch (si->family) {
1056 case AF_INET:
1057 break;
1058 case AF_INET6:
1059 break;
1060 default:
1061 return NULL;
1062 }
1063
1064 switch (type) {
1065 case SWRAP_CONNECT_SEND:
1066 if (si->type != SOCK_STREAM) return NULL;
1067
1068 src_addr = si->myname;
1069 dest_addr = addr;
1070
1071 tcp_seqno = si->io.pck_snd;
1072 tcp_ack = si->io.pck_rcv;
1073 tcp_ctl = 0x02; /* SYN */
1074
1075 si->io.pck_snd += 1;
1076
1077 break;
1078
1079 case SWRAP_CONNECT_RECV:
1080 if (si->type != SOCK_STREAM) return NULL;
1081
1082 dest_addr = si->myname;
1083 src_addr = addr;
1084
1085 tcp_seqno = si->io.pck_rcv;
1086 tcp_ack = si->io.pck_snd;
1087 tcp_ctl = 0x12; /** SYN,ACK */
1088
1089 si->io.pck_rcv += 1;
1090
1091 break;
1092
1093 case SWRAP_CONNECT_UNREACH:
1094 if (si->type != SOCK_STREAM) return NULL;
1095
1096 dest_addr = si->myname;
1097 src_addr = addr;
1098
1099 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
1100 tcp_seqno = si->io.pck_snd - 1;
1101 tcp_ack = si->io.pck_rcv;
1102 tcp_ctl = 0x02; /* SYN */
1103 unreachable = 1;
1104
1105 break;
1106
1107 case SWRAP_CONNECT_ACK:
1108 if (si->type != SOCK_STREAM) return NULL;
1109
1110 src_addr = si->myname;
1111 dest_addr = addr;
1112
1113 tcp_seqno = si->io.pck_snd;
1114 tcp_ack = si->io.pck_rcv;
1115 tcp_ctl = 0x10; /* ACK */
1116
1117 break;
1118
1119 case SWRAP_ACCEPT_SEND:
1120 if (si->type != SOCK_STREAM) return NULL;
1121
1122 dest_addr = si->myname;
1123 src_addr = addr;
1124
1125 tcp_seqno = si->io.pck_rcv;
1126 tcp_ack = si->io.pck_snd;
1127 tcp_ctl = 0x02; /* SYN */
1128
1129 si->io.pck_rcv += 1;
1130
1131 break;
1132
1133 case SWRAP_ACCEPT_RECV:
1134 if (si->type != SOCK_STREAM) return NULL;
1135
1136 src_addr = si->myname;
1137 dest_addr = addr;
1138
1139 tcp_seqno = si->io.pck_snd;
1140 tcp_ack = si->io.pck_rcv;
1141 tcp_ctl = 0x12; /* SYN,ACK */
1142
1143 si->io.pck_snd += 1;
1144
1145 break;
1146
1147 case SWRAP_ACCEPT_ACK:
1148 if (si->type != SOCK_STREAM) return NULL;
1149
1150 dest_addr = si->myname;
1151 src_addr = addr;
1152
1153 tcp_seqno = si->io.pck_rcv;
1154 tcp_ack = si->io.pck_snd;
1155 tcp_ctl = 0x10; /* ACK */
1156
1157 break;
1158
1159 case SWRAP_SEND:
1160 src_addr = si->myname;
1161 dest_addr = si->peername;
1162
1163 tcp_seqno = si->io.pck_snd;
1164 tcp_ack = si->io.pck_rcv;
1165 tcp_ctl = 0x18; /* PSH,ACK */
1166
1167 si->io.pck_snd += len;
1168
1169 break;
1170
1171 case SWRAP_SEND_RST:
1172 dest_addr = si->myname;
1173 src_addr = si->peername;
1174
1175 if (si->type == SOCK_DGRAM) {
1176 return swrap_marshall_packet(si, si->peername,
1177 SWRAP_SENDTO_UNREACH,
1178 buf, len, packet_len);
1179 }
1180
1181 tcp_seqno = si->io.pck_rcv;
1182 tcp_ack = si->io.pck_snd;
1183 tcp_ctl = 0x14; /** RST,ACK */
1184
1185 break;
1186
1187 case SWRAP_PENDING_RST:
1188 dest_addr = si->myname;
1189 src_addr = si->peername;
1190
1191 if (si->type == SOCK_DGRAM) {
1192 return NULL;
1193 }
1194
1195 tcp_seqno = si->io.pck_rcv;
1196 tcp_ack = si->io.pck_snd;
1197 tcp_ctl = 0x14; /* RST,ACK */
1198
1199 break;
1200
1201 case SWRAP_RECV:
1202 dest_addr = si->myname;
1203 src_addr = si->peername;
1204
1205 tcp_seqno = si->io.pck_rcv;
1206 tcp_ack = si->io.pck_snd;
1207 tcp_ctl = 0x18; /* PSH,ACK */
1208
1209 si->io.pck_rcv += len;
1210
1211 break;
1212
1213 case SWRAP_RECV_RST:
1214 dest_addr = si->myname;
1215 src_addr = si->peername;
1216
1217 if (si->type == SOCK_DGRAM) {
1218 return NULL;
1219 }
1220
1221 tcp_seqno = si->io.pck_rcv;
1222 tcp_ack = si->io.pck_snd;
1223 tcp_ctl = 0x14; /* RST,ACK */
1224
1225 break;
1226
1227 case SWRAP_SENDTO:
1228 src_addr = si->myname;
1229 dest_addr = addr;
1230
1231 si->io.pck_snd += len;
1232
1233 break;
1234
1235 case SWRAP_SENDTO_UNREACH:
1236 dest_addr = si->myname;
1237 src_addr = addr;
1238
1239 unreachable = 1;
1240
1241 break;
1242
1243 case SWRAP_RECVFROM:
1244 dest_addr = si->myname;
1245 src_addr = addr;
1246
1247 si->io.pck_rcv += len;
1248
1249 break;
1250
1251 case SWRAP_CLOSE_SEND:
1252 if (si->type != SOCK_STREAM) return NULL;
1253
1254 src_addr = si->myname;
1255 dest_addr = si->peername;
1256
1257 tcp_seqno = si->io.pck_snd;
1258 tcp_ack = si->io.pck_rcv;
1259 tcp_ctl = 0x11; /* FIN, ACK */
1260
1261 si->io.pck_snd += 1;
1262
1263 break;
1264
1265 case SWRAP_CLOSE_RECV:
1266 if (si->type != SOCK_STREAM) return NULL;
1267
1268 dest_addr = si->myname;
1269 src_addr = si->peername;
1270
1271 tcp_seqno = si->io.pck_rcv;
1272 tcp_ack = si->io.pck_snd;
1273 tcp_ctl = 0x11; /* FIN,ACK */
1274
1275 si->io.pck_rcv += 1;
1276
1277 break;
1278
1279 case SWRAP_CLOSE_ACK:
1280 if (si->type != SOCK_STREAM) return NULL;
1281
1282 src_addr = si->myname;
1283 dest_addr = si->peername;
1284
1285 tcp_seqno = si->io.pck_snd;
1286 tcp_ack = si->io.pck_rcv;
1287 tcp_ctl = 0x10; /* ACK */
1288
1289 break;
1290 default:
1291 return NULL;
1292 }
1293
1294 swrapGetTimeOfDay(&tv);
1295
1296 return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1297 (const uint8_t *)buf, len,
1298 tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1299 packet_len);
1300 }
1301
1302 static void swrap_dump_packet(struct socket_info *si,
1303 const struct sockaddr *addr,
1304 enum swrap_packet_type type,
1305 const void *buf, size_t len)
1306 {
1307 const char *file_name;
1308 uint8_t *packet;
1309 size_t packet_len = 0;
1310 int fd;
1311
1312 file_name = socket_wrapper_pcap_file();
1313 if (!file_name) {
1314 return;
1315 }
1316
1317 packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1318 if (!packet) {
1319 return;
1320 }
1321
1322 fd = swrap_get_pcap_fd(file_name);
1323 if (fd != -1) {
1324 if (write(fd, packet, packet_len) != packet_len) {
1325 free(packet);
1326 return;
1327 }
1328 }
1329
1330 free(packet);
1331 }
1332
1333 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
1334 {
1335 struct socket_info *si;
1336 int fd;
1337
1338 if (!socket_wrapper_dir()) {
1339 return real_socket(family, type, protocol);
1340 }
1341
1342 switch (family) {
1343 case AF_INET:
1344 #ifdef HAVE_IPV6
1345 case AF_INET6:
1346 #endif
1347 break;
1348 case AF_UNIX:
1349 return real_socket(family, type, protocol);
1350 default:
1351 errno = EAFNOSUPPORT;
1352 return -1;
1353 }
1354
1355 switch (type) {
1356 case SOCK_STREAM:
1357 break;
1358 case SOCK_DGRAM:
1359 break;
1360 default:
1361 errno = EPROTONOSUPPORT;
1362 return -1;
1363 }
1364
1365 switch (protocol) {
1366 case 0:
1367 break;
1368 case 6:
1369 if (type == SOCK_STREAM) {
1370 break;
1371 }
1372 /*fall through*/
1373 case 17:
1374 if (type == SOCK_DGRAM) {
1375 break;
1376 }
1377 /*fall through*/
1378 default:
1379 errno = EPROTONOSUPPORT;
1380 return -1;
1381 }
1382
1383 fd = real_socket(AF_UNIX, type, 0);
1384
1385 if (fd == -1) return -1;
1386
1387 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1388
1389 si->family = family;
1390 si->type = type;
1391 si->protocol = protocol;
1392 si->fd = fd;
1393
1394 SWRAP_DLIST_ADD(sockets, si);
1395
1396 return si->fd;
1397 }
1398
1399 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1400 {
1401 struct socket_info *parent_si, *child_si;
1402 int fd;
1403 struct sockaddr_un un_addr;
1404 socklen_t un_addrlen = sizeof(un_addr);
1405 struct sockaddr_un un_my_addr;
1406 socklen_t un_my_addrlen = sizeof(un_my_addr);
1407 struct sockaddr *my_addr;
1408 socklen_t my_addrlen, len;
1409 int ret;
1410
1411 parent_si = find_socket_info(s);
1412 if (!parent_si) {
1413 return real_accept(s, addr, addrlen);
1414 }
1415
1416 /*
1417 * assume out sockaddr have the same size as the in parent
1418 * socket family
1419 */
1420 my_addrlen = socket_length(parent_si->family);
1421 if (my_addrlen <= 0) {
1422 errno = EINVAL;
1423 return -1;
1424 }
1425
1426 my_addr = (struct sockaddr *)malloc(my_addrlen);
1427 if (my_addr == NULL) {
1428 return -1;
1429 }
1430
1431 memset(&un_addr, 0, sizeof(un_addr));
1432 memset(&un_my_addr, 0, sizeof(un_my_addr));
1433
1434 ret = real_accept(s, (struct sockaddr *)&un_addr, &un_addrlen);
1435 if (ret == -1) {
1436 free(my_addr);
1437 return ret;
1438 }
1439
1440 fd = ret;
1441
1442 len = my_addrlen;
1443 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1444 parent_si->family, my_addr, &len);
1445 if (ret == -1) {
1446 free(my_addr);
1447 close(fd);
1448 return ret;
1449 }
1450
1451 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1452 memset(child_si, 0, sizeof(*child_si));
1453
1454 child_si->fd = fd;
1455 child_si->family = parent_si->family;
1456 child_si->type = parent_si->type;
1457 child_si->protocol = parent_si->protocol;
1458 child_si->bound = 1;
1459 child_si->is_server = 1;
1460
1461 child_si->peername_len = len;
1462 child_si->peername = sockaddr_dup(my_addr, len);
1463
1464 if (addr != NULL && addrlen != NULL) {
1465 *addrlen = len;
1466 if (*addrlen >= len)
1467 memcpy(addr, my_addr, len);
1468 *addrlen = 0;
1469 }
1470
1471 ret = real_getsockname(fd, (struct sockaddr *)&un_my_addr, &un_my_addrlen);
1472 if (ret == -1) {
1473 free(child_si);
1474 close(fd);
1475 return ret;
1476 }
1477
1478 len = my_addrlen;
1479 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1480 child_si->family, my_addr, &len);
1481 if (ret == -1) {
1482 free(child_si);
1483 free(my_addr);
1484 close(fd);
1485 return ret;
1486 }
1487
1488 child_si->myname_len = len;
1489 child_si->myname = sockaddr_dup(my_addr, len);
1490 free(my_addr);
1491
1492 SWRAP_DLIST_ADD(sockets, child_si);
1493
1494 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1495 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1496 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1497
1498 return fd;
1499 }
1500
1501 static int autobind_start_init;
1502 static int autobind_start;
1503
1504 /* using sendto() or connect() on an unbound socket would give the
1505 recipient no way to reply, as unlike UDP and TCP, a unix domain
1506 socket can't auto-assign emphemeral port numbers, so we need to
1507 assign it here */
1508 static int swrap_auto_bind(struct socket_info *si)
1509 {
1510 struct sockaddr_un un_addr;
1511 int i;
1512 char type;
1513 int ret;
1514 int port;
1515 struct stat st;
1516
1517 if (autobind_start_init != 1) {
1518 autobind_start_init = 1;
1519 autobind_start = getpid();
1520 autobind_start %= 50000;
1521 autobind_start += 10000;
1522 }
1523
1524 un_addr.sun_family = AF_UNIX;
1525
1526 switch (si->family) {
1527 case AF_INET: {
1528 struct sockaddr_in in;
1529
1530 switch (si->type) {
1531 case SOCK_STREAM:
1532 type = SOCKET_TYPE_CHAR_TCP;
1533 break;
1534 case SOCK_DGRAM:
1535 type = SOCKET_TYPE_CHAR_UDP;
1536 break;
1537 default:
1538 errno = ESOCKTNOSUPPORT;
1539 return -1;
1540 }
1541
1542 memset(&in, 0, sizeof(in));
1543 in.sin_family = AF_INET;
1544 in.sin_addr.s_addr = htonl(127<<24 |
1545 socket_wrapper_default_iface());
1546
1547 si->myname_len = sizeof(in);
1548 si->myname = sockaddr_dup(&in, si->myname_len);
1549 break;
1550 }
1551 #ifdef HAVE_IPV6
1552 case AF_INET6: {
1553 struct sockaddr_in6 in6;
1554
1555 switch (si->type) {
1556 case SOCK_STREAM:
1557 type = SOCKET_TYPE_CHAR_TCP_V6;
1558 break;
1559 case SOCK_DGRAM:
1560 type = SOCKET_TYPE_CHAR_UDP_V6;
1561 break;
1562 default:
1563 errno = ESOCKTNOSUPPORT;
1564 return -1;
1565 }
1566
1567 memset(&in6, 0, sizeof(in6));
1568 in6.sin6_family = AF_INET6;
1569 in6.sin6_addr.s6_addr[0] = SW_IPV6_ADDRESS;
1570 si->myname_len = sizeof(in6);
1571 si->myname = sockaddr_dup(&in6, si->myname_len);
1572 break;
1573 }
1574 #endif
1575 default:
1576 errno = ESOCKTNOSUPPORT;
1577 return -1;
1578 }
1579
1580 if (autobind_start > 60000) {
1581 autobind_start = 10000;
1582 }
1583
1584 for (i=0;i<1000;i++) {
1585 port = autobind_start + i;
1586 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1587 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1588 type, socket_wrapper_default_iface(), port);
1589 if (stat(un_addr.sun_path, &st) == 0) continue;
1590
1591 ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
1592 if (ret == -1) return ret;
1593
1594 si->tmp_path = strdup(un_addr.sun_path);
1595 si->bound = 1;
1596 autobind_start = port + 1;
1597 break;
1598 }
1599 if (i == 1000) {
1600 errno = ENFILE;
1601 return -1;
1602 }
1603
1604 set_port(si->family, port, si->myname);
1605
1606 return 0;
1607 }
1608
1609
1610 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1611 {
1612 int ret;
1613 struct sockaddr_un un_addr;
1614 struct socket_info *si = find_socket_info(s);
1615
1616 if (!si) {
1617 return real_connect(s, serv_addr, addrlen);
1618 }
1619
1620 if (si->bound == 0) {
1621 ret = swrap_auto_bind(si);
1622 if (ret == -1) return -1;
1623 }
1624
1625 if (si->family != serv_addr->sa_family) {
1626 errno = EINVAL;
1627 return -1;
1628 }
1629
1630 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
1631 if (ret == -1) return -1;
1632
1633 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1634
1635 ret = real_connect(s, (struct sockaddr *)&un_addr,
1636 sizeof(struct sockaddr_un));
1637
1638 /* to give better errors */
1639 if (ret == -1 && errno == ENOENT) {
1640 errno = EHOSTUNREACH;
1641 }
1642
1643 if (ret == 0) {
1644 si->peername_len = addrlen;
1645 si->peername = sockaddr_dup(serv_addr, addrlen);
1646
1647 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1648 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1649 } else {
1650 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1651 }
1652
1653 return ret;
1654 }
1655
1656 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1657 {
1658 int ret;
1659 struct sockaddr_un un_addr;
1660 struct socket_info *si = find_socket_info(s);
1661
1662 if (!si) {
1663 return real_bind(s, myaddr, addrlen);
1664 }
1665
1666 si->myname_len = addrlen;
1667 si->myname = sockaddr_dup(myaddr, addrlen);
1668
1669 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
1670 if (ret == -1) return -1;
1671
1672 unlink(un_addr.sun_path);
1673
1674 ret = real_bind(s, (struct sockaddr *)&un_addr,
1675 sizeof(struct sockaddr_un));
1676
1677 if (ret == 0) {
1678 si->bound = 1;
1679 }
1680
1681 return ret;
1682 }
1683
1684 _PUBLIC_ int swrap_listen(int s, int backlog)
1685 {
1686 int ret;
1687 struct socket_info *si = find_socket_info(s);
1688
1689 if (!si) {
1690 return real_listen(s, backlog);
1691 }
1692
1693 ret = real_listen(s, backlog);
1694
1695 return ret;
1696 }
1697
1698 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1699 {
1700 struct socket_info *si = find_socket_info(s);
1701
1702 if (!si) {
1703 return real_getpeername(s, name, addrlen);
1704 }
1705
1706 if (!si->peername)
1707 {
1708 errno = ENOTCONN;
1709 return -1;
1710 }
1711
1712 memcpy(name, si->peername, si->peername_len);
1713 *addrlen = si->peername_len;
1714
1715 return 0;
1716 }
1717
1718 _PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1719 {
1720 struct socket_info *si = find_socket_info(s);
1721
1722 if (!si) {
1723 return real_getsockname(s, name, addrlen);
1724 }
1725
1726 memcpy(name, si->myname, si->myname_len);
1727 *addrlen = si->myname_len;
1728
1729 return 0;
1730 }
1731
1732 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1733 {
1734 struct socket_info *si = find_socket_info(s);
1735
1736 if (!si) {
1737 return real_getsockopt(s, level, optname, optval, optlen);
1738 }
1739
1740 if (level == SOL_SOCKET) {
1741 return real_getsockopt(s, level, optname, optval, optlen);
1742 }
1743
1744 errno = ENOPROTOOPT;
1745 return -1;
1746 }
1747
1748 _PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1749 {
1750 struct socket_info *si = find_socket_info(s);
1751
1752 if (!si) {
1753 return real_setsockopt(s, level, optname, optval, optlen);
1754 }
1755
1756 if (level == SOL_SOCKET) {
1757 return real_setsockopt(s, level, optname, optval, optlen);
1758 }
1759
1760 switch (si->family) {
1761 case AF_INET:
1762 return 0;
1763 default:
1764 errno = ENOPROTOOPT;
1765 return -1;
1766 }
1767 }
1768
1769 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
1770 {
1771 struct sockaddr_un un_addr;
1772 socklen_t un_addrlen = sizeof(un_addr);
1773 int ret;
1774 struct socket_info *si = find_socket_info(s);
1775
1776 if (!si) {
1777 return real_recvfrom(s, buf, len, flags, from, fromlen);
1778 }
1779
1780 len = MIN(len, 1500);
1781
1782 /* irix 6.4 forgets to null terminate the sun_path string :-( */
1783 memset(&un_addr, 0, sizeof(un_addr));
1784 ret = real_recvfrom(s, buf, len, flags, (struct sockaddr *)&un_addr, &un_addrlen);
1785 if (ret == -1)
1786 return ret;
1787
1788 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
1789 si->family, from, fromlen) == -1) {
1790 return -1;
1791 }
1792
1793 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
1794
1795 return ret;
1796 }
1797
1798
1799 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
1800 {
1801 struct sockaddr_un un_addr;
1802 int ret;
1803 struct socket_info *si = find_socket_info(s);
1804 int bcast = 0;
1805
1806 if (!si) {
1807 return real_sendto(s, buf, len, flags, to, tolen);
1808 }
1809
1810 len = MIN(len, 1500);
1811
1812 switch (si->type) {
1813 case SOCK_STREAM:
1814 ret = real_send(s, buf, len, flags);
1815 break;
1816 case SOCK_DGRAM:
1817 if (si->bound == 0) {
1818 ret = swrap_auto_bind(si);
1819 if (ret == -1) return -1;
1820 }
1821
1822 ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
1823 if (ret == -1) return -1;
1824
1825 if (bcast) {
1826 struct stat st;
1827 unsigned int iface;
1828 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
1829 char type;
1830
1831 type = SOCKET_TYPE_CHAR_UDP;
1832
1833 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
1834 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
1835 socket_wrapper_dir(), type, iface, prt);
1836 if (stat(un_addr.sun_path, &st) != 0) continue;
1837
1838 /* ignore the any errors in broadcast sends */
1839 real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1840 }
1841
1842 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1843
1844 return len;
1845 }
1846
1847 ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1848 break;
1849 default:
1850 ret = -1;
1851 errno = EHOSTUNREACH;
1852 break;
1853 }
1854
1855 /* to give better errors */
1856 if (ret == -1 && errno == ENOENT) {
1857 errno = EHOSTUNREACH;
1858 }
1859
1860 if (ret == -1) {
1861 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1862 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
1863 } else {
1864 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, ret);
1865 }
1866
1867 return ret;
1868 }
1869
1870 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1871 {
1872 int ret;
1873 struct socket_info *si = find_socket_info(s);
1874 int value;
1875
1876 if (!si) {
1877 return real_ioctl(s, r, p);
1878 }
1879
1880 ret = real_ioctl(s, r, p);
1881
1882 switch (r) {
1883 case FIONREAD:
1884 value = *((int *)p);
1885 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1886 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1887 } else if (value == 0) { /* END OF FILE */
1888 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1889 }
1890 break;
1891 }
1892
1893 return ret;
1894 }
1895
1896 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
1897 {
1898 int ret;
1899 struct socket_info *si = find_socket_info(s);
1900
1901 if (!si) {
1902 return real_recv(s, buf, len, flags);
1903 }
1904
1905 len = MIN(len, 1500);
1906
1907 ret = real_recv(s, buf, len, flags);
1908 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1909 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1910 } else if (ret == 0) { /* END OF FILE */
1911 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1912 } else if (ret > 0) {
1913 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
1914 }
1915
1916 return ret;
1917 }
1918
1919
1920 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
1921 {
1922 int ret;
1923 struct socket_info *si = find_socket_info(s);
1924
1925 if (!si) {
1926 return real_send(s, buf, len, flags);
1927 }
1928
1929 len = MIN(len, 1500);
1930
1931 ret = real_send(s, buf, len, flags);
1932
1933 if (ret == -1) {
1934 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
1935 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
1936 } else {
1937 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
1938 }
1939
1940 return ret;
1941 }
1942
1943 _PUBLIC_ int swrap_close(int fd)
1944 {
1945 struct socket_info *si = find_socket_info(fd);
1946 int ret;
1947
1948 if (!si) {
1949 return real_close(fd);
1950 }
1951
1952 SWRAP_DLIST_REMOVE(sockets, si);
1953
1954 if (si->myname && si->peername) {
1955 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
1956 }
1957
1958 ret = real_close(fd);
1959
1960 if (si->myname && si->peername) {
1961 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
1962 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
1963 }
1964
1965 if (si->path) free(si->path);
1966 if (si->myname) free(si->myname);
1967 if (si->peername) free(si->peername);
1968 if (si->tmp_path) {
1969 unlink(si->tmp_path);
1970 free(si->tmp_path);
1971 }
1972 free(si);
1973
1974 return ret;
1975 }
reg import