source: branches/samba-3.5.x/lib/socket_wrapper/socket_wrapper.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 50.0 KB
Line 
1/*
2 * Copyright (C) Jelmer Vernooij 2005,2008 <jelmer@samba.org>
3 * Copyright (C) Stefan Metzmacher 2006-2009 <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_sendmsg sendmsg
122#define real_ioctl ioctl
123#define real_recv recv
124#define real_read read
125#define real_send send
126#define real_readv readv
127#define real_writev writev
128#define real_socket socket
129#define real_close close
130#endif
131
132#ifdef HAVE_GETTIMEOFDAY_TZ
133#define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
134#else
135#define swrapGetTimeOfDay(tval) gettimeofday(tval)
136#endif
137
138/* we need to use a very terse format here as IRIX 6.4 silently
139 truncates names to 16 chars, so if we use a longer name then we
140 can't tell which port a packet came from with recvfrom()
141
142 with this format we have 8 chars left for the directory name
143*/
144#define SOCKET_FORMAT "%c%02X%04X"
145#define SOCKET_TYPE_CHAR_TCP 'T'
146#define SOCKET_TYPE_CHAR_UDP 'U'
147#define SOCKET_TYPE_CHAR_TCP_V6 'X'
148#define SOCKET_TYPE_CHAR_UDP_V6 'Y'
149
150#define MAX_WRAPPED_INTERFACES 16
151
152#ifdef HAVE_IPV6
153/*
154 * FD00::5357:5FXX
155 */
156static const struct in6_addr *swrap_ipv6(void)
157{
158 static struct in6_addr v;
159 static int initialized;
160 int ret;
161
162 if (initialized) {
163 return &v;
164 }
165 initialized = 1;
166
167 ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
168 if (ret <= 0) {
169 abort();
170 }
171
172 return &v;
173}
174#endif
175
176static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
177{
178 struct sockaddr *ret = (struct sockaddr *)malloc(len);
179 memcpy(ret, data, len);
180 return ret;
181}
182
183static void set_port(int family, int prt, struct sockaddr *addr)
184{
185 switch (family) {
186 case AF_INET:
187 ((struct sockaddr_in *)addr)->sin_port = htons(prt);
188 break;
189#ifdef HAVE_IPV6
190 case AF_INET6:
191 ((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
192 break;
193#endif
194 }
195}
196
197static size_t socket_length(int family)
198{
199 switch (family) {
200 case AF_INET:
201 return sizeof(struct sockaddr_in);
202#ifdef HAVE_IPV6
203 case AF_INET6:
204 return sizeof(struct sockaddr_in6);
205#endif
206 }
207 return 0;
208}
209
210
211
212struct socket_info
213{
214 int fd;
215
216 int family;
217 int type;
218 int protocol;
219 int bound;
220 int bcast;
221 int is_server;
222 int connected;
223 int defer_connect;
224
225 char *path;
226 char *tmp_path;
227
228 struct sockaddr *myname;
229 socklen_t myname_len;
230
231 struct sockaddr *peername;
232 socklen_t peername_len;
233
234 struct {
235 unsigned long pck_snd;
236 unsigned long pck_rcv;
237 } io;
238
239 struct socket_info *prev, *next;
240};
241
242static struct socket_info *sockets;
243
244const char *socket_wrapper_dir(void)
245{
246 const char *s = getenv("SOCKET_WRAPPER_DIR");
247 if (s == NULL) {
248 return NULL;
249 }
250 if (strncmp(s, "./", 2) == 0) {
251 s += 2;
252 }
253 return s;
254}
255
256unsigned int socket_wrapper_default_iface(void)
257{
258 const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
259 if (s) {
260 unsigned int iface;
261 if (sscanf(s, "%u", &iface) == 1) {
262 if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
263 return iface;
264 }
265 }
266 }
267
268 return 1;/* 127.0.0.1 */
269}
270
271static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
272{
273 unsigned int iface;
274 unsigned int prt;
275 const char *p;
276 char type;
277
278 p = strrchr(un->sun_path, '/');
279 if (p) p++; else p = un->sun_path;
280
281 if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
282 errno = EINVAL;
283 return -1;
284 }
285
286 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
287 errno = EINVAL;
288 return -1;
289 }
290
291 if (prt > 0xFFFF) {
292 errno = EINVAL;
293 return -1;
294 }
295
296 switch(type) {
297 case SOCKET_TYPE_CHAR_TCP:
298 case SOCKET_TYPE_CHAR_UDP: {
299 struct sockaddr_in *in2 = (struct sockaddr_in *)in;
300
301 if ((*len) < sizeof(*in2)) {
302 errno = EINVAL;
303 return -1;
304 }
305
306 memset(in2, 0, sizeof(*in2));
307 in2->sin_family = AF_INET;
308 in2->sin_addr.s_addr = htonl((127<<24) | iface);
309 in2->sin_port = htons(prt);
310
311 *len = sizeof(*in2);
312 break;
313 }
314#ifdef HAVE_IPV6
315 case SOCKET_TYPE_CHAR_TCP_V6:
316 case SOCKET_TYPE_CHAR_UDP_V6: {
317 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)in;
318
319 if ((*len) < sizeof(*in2)) {
320 errno = EINVAL;
321 return -1;
322 }
323
324 memset(in2, 0, sizeof(*in2));
325 in2->sin6_family = AF_INET6;
326 in2->sin6_addr = *swrap_ipv6();
327 in2->sin6_addr.s6_addr[15] = iface;
328 in2->sin6_port = htons(prt);
329
330 *len = sizeof(*in2);
331 break;
332 }
333#endif
334 default:
335 errno = EINVAL;
336 return -1;
337 }
338
339 return 0;
340}
341
342static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
343 int *bcast)
344{
345 char type = '\0';
346 unsigned int prt;
347 unsigned int iface;
348 int is_bcast = 0;
349
350 if (bcast) *bcast = 0;
351
352 switch (inaddr->sa_family) {
353 case AF_INET: {
354 const struct sockaddr_in *in =
355 (const struct sockaddr_in *)inaddr;
356 unsigned int addr = ntohl(in->sin_addr.s_addr);
357 char u_type = '\0';
358 char b_type = '\0';
359 char a_type = '\0';
360
361 switch (si->type) {
362 case SOCK_STREAM:
363 u_type = SOCKET_TYPE_CHAR_TCP;
364 break;
365 case SOCK_DGRAM:
366 u_type = SOCKET_TYPE_CHAR_UDP;
367 a_type = SOCKET_TYPE_CHAR_UDP;
368 b_type = SOCKET_TYPE_CHAR_UDP;
369 break;
370 }
371
372 prt = ntohs(in->sin_port);
373 if (a_type && addr == 0xFFFFFFFF) {
374 /* 255.255.255.255 only udp */
375 is_bcast = 2;
376 type = a_type;
377 iface = socket_wrapper_default_iface();
378 } else if (b_type && addr == 0x7FFFFFFF) {
379 /* 127.255.255.255 only udp */
380 is_bcast = 1;
381 type = b_type;
382 iface = socket_wrapper_default_iface();
383 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
384 /* 127.0.0.X */
385 is_bcast = 0;
386 type = u_type;
387 iface = (addr & 0x000000FF);
388 } else {
389 errno = ENETUNREACH;
390 return -1;
391 }
392 if (bcast) *bcast = is_bcast;
393 break;
394 }
395#ifdef HAVE_IPV6
396 case AF_INET6: {
397 const struct sockaddr_in6 *in =
398 (const struct sockaddr_in6 *)inaddr;
399 struct in6_addr cmp;
400
401 switch (si->type) {
402 case SOCK_STREAM:
403 type = SOCKET_TYPE_CHAR_TCP_V6;
404 break;
405 case SOCK_DGRAM:
406 type = SOCKET_TYPE_CHAR_UDP_V6;
407 break;
408 }
409
410 /* XXX no multicast/broadcast */
411
412 prt = ntohs(in->sin6_port);
413
414 cmp = in->sin6_addr;
415 cmp.s6_addr[15] = 0;
416 if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
417 iface = in->sin6_addr.s6_addr[15];
418 } else {
419 errno = ENETUNREACH;
420 return -1;
421 }
422
423 break;
424 }
425#endif
426 default:
427 errno = ENETUNREACH;
428 return -1;
429 }
430
431 if (prt == 0) {
432 errno = EINVAL;
433 return -1;
434 }
435
436 if (is_bcast) {
437 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
438 socket_wrapper_dir());
439 /* the caller need to do more processing */
440 return 0;
441 }
442
443 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
444 socket_wrapper_dir(), type, iface, prt);
445
446 return 0;
447}
448
449static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
450 int *bcast)
451{
452 char type = '\0';
453 unsigned int prt;
454 unsigned int iface;
455 struct stat st;
456 int is_bcast = 0;
457
458 if (bcast) *bcast = 0;
459
460 switch (si->family) {
461 case AF_INET: {
462 const struct sockaddr_in *in =
463 (const struct sockaddr_in *)inaddr;
464 unsigned int addr = ntohl(in->sin_addr.s_addr);
465 char u_type = '\0';
466 char d_type = '\0';
467 char b_type = '\0';
468 char a_type = '\0';
469
470 prt = ntohs(in->sin_port);
471
472 switch (si->type) {
473 case SOCK_STREAM:
474 u_type = SOCKET_TYPE_CHAR_TCP;
475 d_type = SOCKET_TYPE_CHAR_TCP;
476 break;
477 case SOCK_DGRAM:
478 u_type = SOCKET_TYPE_CHAR_UDP;
479 d_type = SOCKET_TYPE_CHAR_UDP;
480 a_type = SOCKET_TYPE_CHAR_UDP;
481 b_type = SOCKET_TYPE_CHAR_UDP;
482 break;
483 }
484
485 if (addr == 0) {
486 /* 0.0.0.0 */
487 is_bcast = 0;
488 type = d_type;
489 iface = socket_wrapper_default_iface();
490 } else if (a_type && addr == 0xFFFFFFFF) {
491 /* 255.255.255.255 only udp */
492 is_bcast = 2;
493 type = a_type;
494 iface = socket_wrapper_default_iface();
495 } else if (b_type && addr == 0x7FFFFFFF) {
496 /* 127.255.255.255 only udp */
497 is_bcast = 1;
498 type = b_type;
499 iface = socket_wrapper_default_iface();
500 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
501 /* 127.0.0.X */
502 is_bcast = 0;
503 type = u_type;
504 iface = (addr & 0x000000FF);
505 } else {
506 errno = EADDRNOTAVAIL;
507 return -1;
508 }
509 break;
510 }
511#ifdef HAVE_IPV6
512 case AF_INET6: {
513 const struct sockaddr_in6 *in =
514 (const struct sockaddr_in6 *)inaddr;
515 struct in6_addr cmp;
516
517 switch (si->type) {
518 case SOCK_STREAM:
519 type = SOCKET_TYPE_CHAR_TCP_V6;
520 break;
521 case SOCK_DGRAM:
522 type = SOCKET_TYPE_CHAR_UDP_V6;
523 break;
524 }
525
526 /* XXX no multicast/broadcast */
527
528 prt = ntohs(in->sin6_port);
529
530 cmp = in->sin6_addr;
531 cmp.s6_addr[15] = 0;
532 if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
533 iface = socket_wrapper_default_iface();
534 } else if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
535 iface = in->sin6_addr.s6_addr[15];
536 } else {
537 errno = EADDRNOTAVAIL;
538 return -1;
539 }
540
541 break;
542 }
543#endif
544 default:
545 errno = EADDRNOTAVAIL;
546 return -1;
547 }
548
549
550 if (bcast) *bcast = is_bcast;
551
552 if (prt == 0) {
553 /* handle auto-allocation of ephemeral ports */
554 for (prt = 5001; prt < 10000; prt++) {
555 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
556 socket_wrapper_dir(), type, iface, prt);
557 if (stat(un->sun_path, &st) == 0) continue;
558
559 set_port(si->family, prt, si->myname);
560 break;
561 }
562 if (prt == 10000) {
563 errno = ENFILE;
564 return -1;
565 }
566 }
567
568 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
569 socket_wrapper_dir(), type, iface, prt);
570 return 0;
571}
572
573static struct socket_info *find_socket_info(int fd)
574{
575 struct socket_info *i;
576 for (i = sockets; i; i = i->next) {
577 if (i->fd == fd)
578 return i;
579 }
580
581 return NULL;
582}
583
584static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
585 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
586{
587 if (!out_addr)
588 return 0;
589
590 out_addr->sun_family = AF_UNIX;
591
592 switch (in_addr->sa_family) {
593 case AF_INET:
594#ifdef HAVE_IPV6
595 case AF_INET6:
596#endif
597 switch (si->type) {
598 case SOCK_STREAM:
599 case SOCK_DGRAM:
600 break;
601 default:
602 errno = ESOCKTNOSUPPORT;
603 return -1;
604 }
605 if (alloc_sock) {
606 return convert_in_un_alloc(si, in_addr, out_addr, bcast);
607 } else {
608 return convert_in_un_remote(si, in_addr, out_addr, bcast);
609 }
610 default:
611 break;
612 }
613
614 errno = EAFNOSUPPORT;
615 return -1;
616}
617
618static int sockaddr_convert_from_un(const struct socket_info *si,
619 const struct sockaddr_un *in_addr,
620 socklen_t un_addrlen,
621 int family,
622 struct sockaddr *out_addr,
623 socklen_t *out_addrlen)
624{
625 if (out_addr == NULL || out_addrlen == NULL)
626 return 0;
627
628 if (un_addrlen == 0) {
629 *out_addrlen = 0;
630 return 0;
631 }
632
633 switch (family) {
634 case AF_INET:
635#ifdef HAVE_IPV6
636 case AF_INET6:
637#endif
638 switch (si->type) {
639 case SOCK_STREAM:
640 case SOCK_DGRAM:
641 break;
642 default:
643 errno = ESOCKTNOSUPPORT;
644 return -1;
645 }
646 return convert_un_in(in_addr, out_addr, out_addrlen);
647 default:
648 break;
649 }
650
651 errno = EAFNOSUPPORT;
652 return -1;
653}
654
655enum swrap_packet_type {
656 SWRAP_CONNECT_SEND,
657 SWRAP_CONNECT_UNREACH,
658 SWRAP_CONNECT_RECV,
659 SWRAP_CONNECT_ACK,
660 SWRAP_ACCEPT_SEND,
661 SWRAP_ACCEPT_RECV,
662 SWRAP_ACCEPT_ACK,
663 SWRAP_RECVFROM,
664 SWRAP_SENDTO,
665 SWRAP_SENDTO_UNREACH,
666 SWRAP_PENDING_RST,
667 SWRAP_RECV,
668 SWRAP_RECV_RST,
669 SWRAP_SEND,
670 SWRAP_SEND_RST,
671 SWRAP_CLOSE_SEND,
672 SWRAP_CLOSE_RECV,
673 SWRAP_CLOSE_ACK,
674};
675
676struct swrap_file_hdr {
677 uint32_t magic;
678 uint16_t version_major;
679 uint16_t version_minor;
680 int32_t timezone;
681 uint32_t sigfigs;
682 uint32_t frame_max_len;
683#define SWRAP_FRAME_LENGTH_MAX 0xFFFF
684 uint32_t link_type;
685};
686#define SWRAP_FILE_HDR_SIZE 24
687
688struct swrap_packet_frame {
689 uint32_t seconds;
690 uint32_t micro_seconds;
691 uint32_t recorded_length;
692 uint32_t full_length;
693};
694#define SWRAP_PACKET_FRAME_SIZE 16
695
696union swrap_packet_ip {
697 struct {
698 uint8_t ver_hdrlen;
699 uint8_t tos;
700 uint16_t packet_length;
701 uint16_t identification;
702 uint8_t flags;
703 uint8_t fragment;
704 uint8_t ttl;
705 uint8_t protocol;
706 uint16_t hdr_checksum;
707 uint32_t src_addr;
708 uint32_t dest_addr;
709 } v4;
710#define SWRAP_PACKET_IP_V4_SIZE 20
711 struct {
712 uint8_t ver_prio;
713 uint8_t flow_label_high;
714 uint16_t flow_label_low;
715 uint16_t payload_length;
716 uint8_t next_header;
717 uint8_t hop_limit;
718 uint8_t src_addr[16];
719 uint8_t dest_addr[16];
720 } v6;
721#define SWRAP_PACKET_IP_V6_SIZE 40
722};
723#define SWRAP_PACKET_IP_SIZE 40
724
725union swrap_packet_payload {
726 struct {
727 uint16_t source_port;
728 uint16_t dest_port;
729 uint32_t seq_num;
730 uint32_t ack_num;
731 uint8_t hdr_length;
732 uint8_t control;
733 uint16_t window;
734 uint16_t checksum;
735 uint16_t urg;
736 } tcp;
737#define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
738 struct {
739 uint16_t source_port;
740 uint16_t dest_port;
741 uint16_t length;
742 uint16_t checksum;
743 } udp;
744#define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
745 struct {
746 uint8_t type;
747 uint8_t code;
748 uint16_t checksum;
749 uint32_t unused;
750 } icmp4;
751#define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
752 struct {
753 uint8_t type;
754 uint8_t code;
755 uint16_t checksum;
756 uint32_t unused;
757 } icmp6;
758#define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
759};
760#define SWRAP_PACKET_PAYLOAD_SIZE 20
761
762#define SWRAP_PACKET_MIN_ALLOC \
763 (SWRAP_PACKET_FRAME_SIZE + \
764 SWRAP_PACKET_IP_SIZE + \
765 SWRAP_PACKET_PAYLOAD_SIZE)
766
767static const char *socket_wrapper_pcap_file(void)
768{
769 static int initialized = 0;
770 static const char *s = NULL;
771 static const struct swrap_file_hdr h;
772 static const struct swrap_packet_frame f;
773 static const union swrap_packet_ip i;
774 static const union swrap_packet_payload p;
775
776 if (initialized == 1) {
777 return s;
778 }
779 initialized = 1;
780
781 /*
782 * TODO: don't use the structs use plain buffer offsets
783 * and PUSH_U8(), PUSH_U16() and PUSH_U32()
784 *
785 * for now make sure we disable PCAP support
786 * if the struct has alignment!
787 */
788 if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
789 return NULL;
790 }
791 if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
792 return NULL;
793 }
794 if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
795 return NULL;
796 }
797 if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
798 return NULL;
799 }
800 if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
801 return NULL;
802 }
803 if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
804 return NULL;
805 }
806 if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
807 return NULL;
808 }
809 if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
810 return NULL;
811 }
812 if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
813 return NULL;
814 }
815 if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
816 return NULL;
817 }
818
819 s = getenv("SOCKET_WRAPPER_PCAP_FILE");
820 if (s == NULL) {
821 return NULL;
822 }
823 if (strncmp(s, "./", 2) == 0) {
824 s += 2;
825 }
826 return s;
827}
828
829static uint8_t *swrap_packet_init(struct timeval *tval,
830 const struct sockaddr *src,
831 const struct sockaddr *dest,
832 int socket_type,
833 const uint8_t *payload,
834 size_t payload_len,
835 unsigned long tcp_seqno,
836 unsigned long tcp_ack,
837 unsigned char tcp_ctl,
838 int unreachable,
839 size_t *_packet_len)
840{
841 uint8_t *base;
842 uint8_t *buf;
843 struct swrap_packet_frame *frame;
844 union swrap_packet_ip *ip;
845 union swrap_packet_payload *pay;
846 size_t packet_len;
847 size_t alloc_len;
848 size_t nonwire_len = sizeof(*frame);
849 size_t wire_hdr_len = 0;
850 size_t wire_len = 0;
851 size_t ip_hdr_len = 0;
852 size_t icmp_hdr_len = 0;
853 size_t icmp_truncate_len = 0;
854 uint8_t protocol = 0, icmp_protocol = 0;
855 const struct sockaddr_in *src_in = NULL;
856 const struct sockaddr_in *dest_in = NULL;
857#ifdef HAVE_IPV6
858 const struct sockaddr_in6 *src_in6 = NULL;
859 const struct sockaddr_in6 *dest_in6 = NULL;
860#endif
861 uint16_t src_port;
862 uint16_t dest_port;
863
864 switch (src->sa_family) {
865 case AF_INET:
866 src_in = (const struct sockaddr_in *)src;
867 dest_in = (const struct sockaddr_in *)dest;
868 src_port = src_in->sin_port;
869 dest_port = dest_in->sin_port;
870 ip_hdr_len = sizeof(ip->v4);
871 break;
872#ifdef HAVE_IPV6
873 case AF_INET6:
874 src_in6 = (const struct sockaddr_in6 *)src;
875 dest_in6 = (const struct sockaddr_in6 *)dest;
876 src_port = src_in6->sin6_port;
877 dest_port = dest_in6->sin6_port;
878 ip_hdr_len = sizeof(ip->v6);
879 break;
880#endif
881 default:
882 return NULL;
883 }
884
885 switch (socket_type) {
886 case SOCK_STREAM:
887 protocol = 0x06; /* TCP */
888 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
889 wire_len = wire_hdr_len + payload_len;
890 break;
891
892 case SOCK_DGRAM:
893 protocol = 0x11; /* UDP */
894 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
895 wire_len = wire_hdr_len + payload_len;
896 break;
897
898 default:
899 return NULL;
900 }
901
902 if (unreachable) {
903 icmp_protocol = protocol;
904 switch (src->sa_family) {
905 case AF_INET:
906 protocol = 0x01; /* ICMPv4 */
907 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
908 break;
909#ifdef HAVE_IPV6
910 case AF_INET6:
911 protocol = 0x3A; /* ICMPv6 */
912 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
913 break;
914#endif
915 }
916 if (wire_len > 64 ) {
917 icmp_truncate_len = wire_len - 64;
918 }
919 wire_hdr_len += icmp_hdr_len;
920 wire_len += icmp_hdr_len;
921 }
922
923 packet_len = nonwire_len + wire_len;
924 alloc_len = packet_len;
925 if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
926 alloc_len = SWRAP_PACKET_MIN_ALLOC;
927 }
928
929 base = (uint8_t *)malloc(alloc_len);
930 if (!base) return NULL;
931
932 buf = base;
933
934 frame = (struct swrap_packet_frame *)buf;
935 frame->seconds = tval->tv_sec;
936 frame->micro_seconds = tval->tv_usec;
937 frame->recorded_length = wire_len - icmp_truncate_len;
938 frame->full_length = wire_len - icmp_truncate_len;
939 buf += SWRAP_PACKET_FRAME_SIZE;
940
941 ip = (union swrap_packet_ip *)buf;
942 switch (src->sa_family) {
943 case AF_INET:
944 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
945 ip->v4.tos = 0x00;
946 ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
947 ip->v4.identification = htons(0xFFFF);
948 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
949 ip->v4.fragment = htons(0x0000);
950 ip->v4.ttl = 0xFF;
951 ip->v4.protocol = protocol;
952 ip->v4.hdr_checksum = htons(0x0000);
953 ip->v4.src_addr = src_in->sin_addr.s_addr;
954 ip->v4.dest_addr = dest_in->sin_addr.s_addr;
955 buf += SWRAP_PACKET_IP_V4_SIZE;
956 break;
957#ifdef HAVE_IPV6
958 case AF_INET6:
959 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
960 ip->v6.flow_label_high = 0x00;
961 ip->v6.flow_label_low = 0x0000;
962 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
963 ip->v6.next_header = protocol;
964 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
965 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
966 buf += SWRAP_PACKET_IP_V6_SIZE;
967 break;
968#endif
969 }
970
971 if (unreachable) {
972 pay = (union swrap_packet_payload *)buf;
973 switch (src->sa_family) {
974 case AF_INET:
975 pay->icmp4.type = 0x03; /* destination unreachable */
976 pay->icmp4.code = 0x01; /* host unreachable */
977 pay->icmp4.checksum = htons(0x0000);
978 pay->icmp4.unused = htonl(0x00000000);
979 buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
980
981 /* set the ip header in the ICMP payload */
982 ip = (union swrap_packet_ip *)buf;
983 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
984 ip->v4.tos = 0x00;
985 ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
986 ip->v4.identification = htons(0xFFFF);
987 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
988 ip->v4.fragment = htons(0x0000);
989 ip->v4.ttl = 0xFF;
990 ip->v4.protocol = icmp_protocol;
991 ip->v4.hdr_checksum = htons(0x0000);
992 ip->v4.src_addr = dest_in->sin_addr.s_addr;
993 ip->v4.dest_addr = src_in->sin_addr.s_addr;
994 buf += SWRAP_PACKET_IP_V4_SIZE;
995
996 src_port = dest_in->sin_port;
997 dest_port = src_in->sin_port;
998 break;
999#ifdef HAVE_IPV6
1000 case AF_INET6:
1001 pay->icmp6.type = 0x01; /* destination unreachable */
1002 pay->icmp6.code = 0x03; /* address unreachable */
1003 pay->icmp6.checksum = htons(0x0000);
1004 pay->icmp6.unused = htonl(0x00000000);
1005 buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
1006
1007 /* set the ip header in the ICMP payload */
1008 ip = (union swrap_packet_ip *)buf;
1009 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
1010 ip->v6.flow_label_high = 0x00;
1011 ip->v6.flow_label_low = 0x0000;
1012 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
1013 ip->v6.next_header = protocol;
1014 memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
1015 memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
1016 buf += SWRAP_PACKET_IP_V6_SIZE;
1017
1018 src_port = dest_in6->sin6_port;
1019 dest_port = src_in6->sin6_port;
1020 break;
1021#endif
1022 }
1023 }
1024
1025 pay = (union swrap_packet_payload *)buf;
1026
1027 switch (socket_type) {
1028 case SOCK_STREAM:
1029 pay->tcp.source_port = src_port;
1030 pay->tcp.dest_port = dest_port;
1031 pay->tcp.seq_num = htonl(tcp_seqno);
1032 pay->tcp.ack_num = htonl(tcp_ack);
1033 pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
1034 pay->tcp.control = tcp_ctl;
1035 pay->tcp.window = htons(0x7FFF);
1036 pay->tcp.checksum = htons(0x0000);
1037 pay->tcp.urg = htons(0x0000);
1038 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
1039
1040 break;
1041
1042 case SOCK_DGRAM:
1043 pay->udp.source_port = src_port;
1044 pay->udp.dest_port = dest_port;
1045 pay->udp.length = htons(8 + payload_len);
1046 pay->udp.checksum = htons(0x0000);
1047 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
1048
1049 break;
1050 }
1051
1052 if (payload && payload_len > 0) {
1053 memcpy(buf, payload, payload_len);
1054 }
1055
1056 *_packet_len = packet_len - icmp_truncate_len;
1057 return base;
1058}
1059
1060static int swrap_get_pcap_fd(const char *fname)
1061{
1062 static int fd = -1;
1063
1064 if (fd != -1) return fd;
1065
1066 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1067 if (fd != -1) {
1068 struct swrap_file_hdr file_hdr;
1069 file_hdr.magic = 0xA1B2C3D4;
1070 file_hdr.version_major = 0x0002;
1071 file_hdr.version_minor = 0x0004;
1072 file_hdr.timezone = 0x00000000;
1073 file_hdr.sigfigs = 0x00000000;
1074 file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
1075 file_hdr.link_type = 0x0065; /* 101 RAW IP */
1076
1077 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1078 close(fd);
1079 fd = -1;
1080 }
1081 return fd;
1082 }
1083
1084 fd = open(fname, O_WRONLY|O_APPEND, 0644);
1085
1086 return fd;
1087}
1088
1089static uint8_t *swrap_marshall_packet(struct socket_info *si,
1090 const struct sockaddr *addr,
1091 enum swrap_packet_type type,
1092 const void *buf, size_t len,
1093 size_t *packet_len)
1094{
1095 const struct sockaddr *src_addr;
1096 const struct sockaddr *dest_addr;
1097 unsigned long tcp_seqno = 0;
1098 unsigned long tcp_ack = 0;
1099 unsigned char tcp_ctl = 0;
1100 int unreachable = 0;
1101
1102 struct timeval tv;
1103
1104 switch (si->family) {
1105 case AF_INET:
1106 break;
1107#ifdef HAVE_IPV6
1108 case AF_INET6:
1109 break;
1110#endif
1111 default:
1112 return NULL;
1113 }
1114
1115 switch (type) {
1116 case SWRAP_CONNECT_SEND:
1117 if (si->type != SOCK_STREAM) return NULL;
1118
1119 src_addr = si->myname;
1120 dest_addr = addr;
1121
1122 tcp_seqno = si->io.pck_snd;
1123 tcp_ack = si->io.pck_rcv;
1124 tcp_ctl = 0x02; /* SYN */
1125
1126 si->io.pck_snd += 1;
1127
1128 break;
1129
1130 case SWRAP_CONNECT_RECV:
1131 if (si->type != SOCK_STREAM) return NULL;
1132
1133 dest_addr = si->myname;
1134 src_addr = addr;
1135
1136 tcp_seqno = si->io.pck_rcv;
1137 tcp_ack = si->io.pck_snd;
1138 tcp_ctl = 0x12; /** SYN,ACK */
1139
1140 si->io.pck_rcv += 1;
1141
1142 break;
1143
1144 case SWRAP_CONNECT_UNREACH:
1145 if (si->type != SOCK_STREAM) return NULL;
1146
1147 dest_addr = si->myname;
1148 src_addr = addr;
1149
1150 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
1151 tcp_seqno = si->io.pck_snd - 1;
1152 tcp_ack = si->io.pck_rcv;
1153 tcp_ctl = 0x02; /* SYN */
1154 unreachable = 1;
1155
1156 break;
1157
1158 case SWRAP_CONNECT_ACK:
1159 if (si->type != SOCK_STREAM) return NULL;
1160
1161 src_addr = si->myname;
1162 dest_addr = addr;
1163
1164 tcp_seqno = si->io.pck_snd;
1165 tcp_ack = si->io.pck_rcv;
1166 tcp_ctl = 0x10; /* ACK */
1167
1168 break;
1169
1170 case SWRAP_ACCEPT_SEND:
1171 if (si->type != SOCK_STREAM) return NULL;
1172
1173 dest_addr = si->myname;
1174 src_addr = addr;
1175
1176 tcp_seqno = si->io.pck_rcv;
1177 tcp_ack = si->io.pck_snd;
1178 tcp_ctl = 0x02; /* SYN */
1179
1180 si->io.pck_rcv += 1;
1181
1182 break;
1183
1184 case SWRAP_ACCEPT_RECV:
1185 if (si->type != SOCK_STREAM) return NULL;
1186
1187 src_addr = si->myname;
1188 dest_addr = addr;
1189
1190 tcp_seqno = si->io.pck_snd;
1191 tcp_ack = si->io.pck_rcv;
1192 tcp_ctl = 0x12; /* SYN,ACK */
1193
1194 si->io.pck_snd += 1;
1195
1196 break;
1197
1198 case SWRAP_ACCEPT_ACK:
1199 if (si->type != SOCK_STREAM) return NULL;
1200
1201 dest_addr = si->myname;
1202 src_addr = addr;
1203
1204 tcp_seqno = si->io.pck_rcv;
1205 tcp_ack = si->io.pck_snd;
1206 tcp_ctl = 0x10; /* ACK */
1207
1208 break;
1209
1210 case SWRAP_SEND:
1211 src_addr = si->myname;
1212 dest_addr = si->peername;
1213
1214 tcp_seqno = si->io.pck_snd;
1215 tcp_ack = si->io.pck_rcv;
1216 tcp_ctl = 0x18; /* PSH,ACK */
1217
1218 si->io.pck_snd += len;
1219
1220 break;
1221
1222 case SWRAP_SEND_RST:
1223 dest_addr = si->myname;
1224 src_addr = si->peername;
1225
1226 if (si->type == SOCK_DGRAM) {
1227 return swrap_marshall_packet(si, si->peername,
1228 SWRAP_SENDTO_UNREACH,
1229 buf, len, packet_len);
1230 }
1231
1232 tcp_seqno = si->io.pck_rcv;
1233 tcp_ack = si->io.pck_snd;
1234 tcp_ctl = 0x14; /** RST,ACK */
1235
1236 break;
1237
1238 case SWRAP_PENDING_RST:
1239 dest_addr = si->myname;
1240 src_addr = si->peername;
1241
1242 if (si->type == SOCK_DGRAM) {
1243 return NULL;
1244 }
1245
1246 tcp_seqno = si->io.pck_rcv;
1247 tcp_ack = si->io.pck_snd;
1248 tcp_ctl = 0x14; /* RST,ACK */
1249
1250 break;
1251
1252 case SWRAP_RECV:
1253 dest_addr = si->myname;
1254 src_addr = si->peername;
1255
1256 tcp_seqno = si->io.pck_rcv;
1257 tcp_ack = si->io.pck_snd;
1258 tcp_ctl = 0x18; /* PSH,ACK */
1259
1260 si->io.pck_rcv += len;
1261
1262 break;
1263
1264 case SWRAP_RECV_RST:
1265 dest_addr = si->myname;
1266 src_addr = si->peername;
1267
1268 if (si->type == SOCK_DGRAM) {
1269 return NULL;
1270 }
1271
1272 tcp_seqno = si->io.pck_rcv;
1273 tcp_ack = si->io.pck_snd;
1274 tcp_ctl = 0x14; /* RST,ACK */
1275
1276 break;
1277
1278 case SWRAP_SENDTO:
1279 src_addr = si->myname;
1280 dest_addr = addr;
1281
1282 si->io.pck_snd += len;
1283
1284 break;
1285
1286 case SWRAP_SENDTO_UNREACH:
1287 dest_addr = si->myname;
1288 src_addr = addr;
1289
1290 unreachable = 1;
1291
1292 break;
1293
1294 case SWRAP_RECVFROM:
1295 dest_addr = si->myname;
1296 src_addr = addr;
1297
1298 si->io.pck_rcv += len;
1299
1300 break;
1301
1302 case SWRAP_CLOSE_SEND:
1303 if (si->type != SOCK_STREAM) return NULL;
1304
1305 src_addr = si->myname;
1306 dest_addr = si->peername;
1307
1308 tcp_seqno = si->io.pck_snd;
1309 tcp_ack = si->io.pck_rcv;
1310 tcp_ctl = 0x11; /* FIN, ACK */
1311
1312 si->io.pck_snd += 1;
1313
1314 break;
1315
1316 case SWRAP_CLOSE_RECV:
1317 if (si->type != SOCK_STREAM) return NULL;
1318
1319 dest_addr = si->myname;
1320 src_addr = si->peername;
1321
1322 tcp_seqno = si->io.pck_rcv;
1323 tcp_ack = si->io.pck_snd;
1324 tcp_ctl = 0x11; /* FIN,ACK */
1325
1326 si->io.pck_rcv += 1;
1327
1328 break;
1329
1330 case SWRAP_CLOSE_ACK:
1331 if (si->type != SOCK_STREAM) return NULL;
1332
1333 src_addr = si->myname;
1334 dest_addr = si->peername;
1335
1336 tcp_seqno = si->io.pck_snd;
1337 tcp_ack = si->io.pck_rcv;
1338 tcp_ctl = 0x10; /* ACK */
1339
1340 break;
1341 default:
1342 return NULL;
1343 }
1344
1345 swrapGetTimeOfDay(&tv);
1346
1347 return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1348 (const uint8_t *)buf, len,
1349 tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1350 packet_len);
1351}
1352
1353static void swrap_dump_packet(struct socket_info *si,
1354 const struct sockaddr *addr,
1355 enum swrap_packet_type type,
1356 const void *buf, size_t len)
1357{
1358 const char *file_name;
1359 uint8_t *packet;
1360 size_t packet_len = 0;
1361 int fd;
1362
1363 file_name = socket_wrapper_pcap_file();
1364 if (!file_name) {
1365 return;
1366 }
1367
1368 packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1369 if (!packet) {
1370 return;
1371 }
1372
1373 fd = swrap_get_pcap_fd(file_name);
1374 if (fd != -1) {
1375 if (write(fd, packet, packet_len) != packet_len) {
1376 free(packet);
1377 return;
1378 }
1379 }
1380
1381 free(packet);
1382}
1383
1384_PUBLIC_ int swrap_socket(int family, int type, int protocol)
1385{
1386 struct socket_info *si;
1387 int fd;
1388 int real_type = type;
1389#ifdef SOCK_CLOEXEC
1390 real_type &= ~SOCK_CLOEXEC;
1391#endif
1392#ifdef SOCK_NONBLOCK
1393 real_type &= ~SOCK_NONBLOCK;
1394#endif
1395
1396 if (!socket_wrapper_dir()) {
1397 return real_socket(family, type, protocol);
1398 }
1399
1400 switch (family) {
1401 case AF_INET:
1402#ifdef HAVE_IPV6
1403 case AF_INET6:
1404#endif
1405 break;
1406 case AF_UNIX:
1407 return real_socket(family, type, protocol);
1408 default:
1409 errno = EAFNOSUPPORT;
1410 return -1;
1411 }
1412
1413 switch (real_type) {
1414 case SOCK_STREAM:
1415 break;
1416 case SOCK_DGRAM:
1417 break;
1418 default:
1419 errno = EPROTONOSUPPORT;
1420 return -1;
1421 }
1422
1423 switch (protocol) {
1424 case 0:
1425 break;
1426 case 6:
1427 if (real_type == SOCK_STREAM) {
1428 break;
1429 }
1430 /*fall through*/
1431 case 17:
1432 if (real_type == SOCK_DGRAM) {
1433 break;
1434 }
1435 /*fall through*/
1436 default:
1437 errno = EPROTONOSUPPORT;
1438 return -1;
1439 }
1440
1441 /* We must call real_socket with type, from the caller, not the version we removed
1442 SOCK_CLOEXEC and SOCK_NONBLOCK from */
1443 fd = real_socket(AF_UNIX, type, 0);
1444
1445 if (fd == -1) return -1;
1446
1447 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1448
1449 si->family = family;
1450
1451 /* however, the rest of the socket_wrapper code expects just
1452 * the type, not the flags */
1453 si->type = real_type;
1454 si->protocol = protocol;
1455 si->fd = fd;
1456
1457 SWRAP_DLIST_ADD(sockets, si);
1458
1459 return si->fd;
1460}
1461
1462_PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1463{
1464 struct socket_info *parent_si, *child_si;
1465 int fd;
1466 struct sockaddr_un un_addr;
1467 socklen_t un_addrlen = sizeof(un_addr);
1468 struct sockaddr_un un_my_addr;
1469 socklen_t un_my_addrlen = sizeof(un_my_addr);
1470 struct sockaddr *my_addr;
1471 socklen_t my_addrlen, len;
1472 int ret;
1473
1474 parent_si = find_socket_info(s);
1475 if (!parent_si) {
1476 return real_accept(s, addr, addrlen);
1477 }
1478
1479 /*
1480 * assume out sockaddr have the same size as the in parent
1481 * socket family
1482 */
1483 my_addrlen = socket_length(parent_si->family);
1484 if (my_addrlen <= 0) {
1485 errno = EINVAL;
1486 return -1;
1487 }
1488
1489 my_addr = (struct sockaddr *)malloc(my_addrlen);
1490 if (my_addr == NULL) {
1491 return -1;
1492 }
1493
1494 memset(&un_addr, 0, sizeof(un_addr));
1495 memset(&un_my_addr, 0, sizeof(un_my_addr));
1496
1497 ret = real_accept(s, (struct sockaddr *)&un_addr, &un_addrlen);
1498 if (ret == -1) {
1499 free(my_addr);
1500 return ret;
1501 }
1502
1503 fd = ret;
1504
1505 len = my_addrlen;
1506 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1507 parent_si->family, my_addr, &len);
1508 if (ret == -1) {
1509 free(my_addr);
1510 close(fd);
1511 return ret;
1512 }
1513
1514 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1515 memset(child_si, 0, sizeof(*child_si));
1516
1517 child_si->fd = fd;
1518 child_si->family = parent_si->family;
1519 child_si->type = parent_si->type;
1520 child_si->protocol = parent_si->protocol;
1521 child_si->bound = 1;
1522 child_si->is_server = 1;
1523 child_si->connected = 1;
1524
1525 child_si->peername_len = len;
1526 child_si->peername = sockaddr_dup(my_addr, len);
1527
1528 if (addr != NULL && addrlen != NULL) {
1529 *addrlen = len;
1530 if (*addrlen >= len)
1531 memcpy(addr, my_addr, len);
1532 *addrlen = 0;
1533 }
1534
1535 ret = real_getsockname(fd, (struct sockaddr *)&un_my_addr, &un_my_addrlen);
1536 if (ret == -1) {
1537 free(child_si);
1538 close(fd);
1539 return ret;
1540 }
1541
1542 len = my_addrlen;
1543 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1544 child_si->family, my_addr, &len);
1545 if (ret == -1) {
1546 free(child_si);
1547 free(my_addr);
1548 close(fd);
1549 return ret;
1550 }
1551
1552 child_si->myname_len = len;
1553 child_si->myname = sockaddr_dup(my_addr, len);
1554 free(my_addr);
1555
1556 SWRAP_DLIST_ADD(sockets, child_si);
1557
1558 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1559 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1560 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1561
1562 return fd;
1563}
1564
1565static int autobind_start_init;
1566static int autobind_start;
1567
1568/* using sendto() or connect() on an unbound socket would give the
1569 recipient no way to reply, as unlike UDP and TCP, a unix domain
1570 socket can't auto-assign emphemeral port numbers, so we need to
1571 assign it here.
1572 Note: this might change the family from ipv6 to ipv4
1573*/
1574static int swrap_auto_bind(struct socket_info *si, int family)
1575{
1576 struct sockaddr_un un_addr;
1577 int i;
1578 char type;
1579 int ret;
1580 int port;
1581 struct stat st;
1582
1583 if (autobind_start_init != 1) {
1584 autobind_start_init = 1;
1585 autobind_start = getpid();
1586 autobind_start %= 50000;
1587 autobind_start += 10000;
1588 }
1589
1590 un_addr.sun_family = AF_UNIX;
1591
1592 switch (family) {
1593 case AF_INET: {
1594 struct sockaddr_in in;
1595
1596 switch (si->type) {
1597 case SOCK_STREAM:
1598 type = SOCKET_TYPE_CHAR_TCP;
1599 break;
1600 case SOCK_DGRAM:
1601 type = SOCKET_TYPE_CHAR_UDP;
1602 break;
1603 default:
1604 errno = ESOCKTNOSUPPORT;
1605 return -1;
1606 }
1607
1608 memset(&in, 0, sizeof(in));
1609 in.sin_family = AF_INET;
1610 in.sin_addr.s_addr = htonl(127<<24 |
1611 socket_wrapper_default_iface());
1612
1613 si->myname_len = sizeof(in);
1614 si->myname = sockaddr_dup(&in, si->myname_len);
1615 break;
1616 }
1617#ifdef HAVE_IPV6
1618 case AF_INET6: {
1619 struct sockaddr_in6 in6;
1620
1621 if (si->family != family) {
1622 errno = ENETUNREACH;
1623 return -1;
1624 }
1625
1626 switch (si->type) {
1627 case SOCK_STREAM:
1628 type = SOCKET_TYPE_CHAR_TCP_V6;
1629 break;
1630 case SOCK_DGRAM:
1631 type = SOCKET_TYPE_CHAR_UDP_V6;
1632 break;
1633 default:
1634 errno = ESOCKTNOSUPPORT;
1635 return -1;
1636 }
1637
1638 memset(&in6, 0, sizeof(in6));
1639 in6.sin6_family = AF_INET6;
1640 in6.sin6_addr = *swrap_ipv6();
1641 in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
1642 si->myname_len = sizeof(in6);
1643 si->myname = sockaddr_dup(&in6, si->myname_len);
1644 break;
1645 }
1646#endif
1647 default:
1648 errno = ESOCKTNOSUPPORT;
1649 return -1;
1650 }
1651
1652 if (autobind_start > 60000) {
1653 autobind_start = 10000;
1654 }
1655
1656 for (i=0;i<1000;i++) {
1657 port = autobind_start + i;
1658 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1659 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1660 type, socket_wrapper_default_iface(), port);
1661 if (stat(un_addr.sun_path, &st) == 0) continue;
1662
1663 ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
1664 if (ret == -1) return ret;
1665
1666 si->tmp_path = strdup(un_addr.sun_path);
1667 si->bound = 1;
1668 autobind_start = port + 1;
1669 break;
1670 }
1671 if (i == 1000) {
1672 errno = ENFILE;
1673 return -1;
1674 }
1675
1676 si->family = family;
1677 set_port(si->family, port, si->myname);
1678
1679 return 0;
1680}
1681
1682
1683_PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1684{
1685 int ret;
1686 struct sockaddr_un un_addr;
1687 struct socket_info *si = find_socket_info(s);
1688
1689 if (!si) {
1690 return real_connect(s, serv_addr, addrlen);
1691 }
1692
1693 if (si->bound == 0) {
1694 ret = swrap_auto_bind(si, serv_addr->sa_family);
1695 if (ret == -1) return -1;
1696 }
1697
1698 if (si->family != serv_addr->sa_family) {
1699 errno = EINVAL;
1700 return -1;
1701 }
1702
1703 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
1704 if (ret == -1) return -1;
1705
1706 if (si->type == SOCK_DGRAM) {
1707 si->defer_connect = 1;
1708 ret = 0;
1709 } else {
1710 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1711
1712 ret = real_connect(s, (struct sockaddr *)&un_addr,
1713 sizeof(struct sockaddr_un));
1714 }
1715
1716 /* to give better errors */
1717 if (ret == -1 && errno == ENOENT) {
1718 errno = EHOSTUNREACH;
1719 }
1720
1721 if (ret == 0) {
1722 si->peername_len = addrlen;
1723 si->peername = sockaddr_dup(serv_addr, addrlen);
1724 si->connected = 1;
1725
1726 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1727 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1728 } else {
1729 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1730 }
1731
1732 return ret;
1733}
1734
1735_PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1736{
1737 int ret;
1738 struct sockaddr_un un_addr;
1739 struct socket_info *si = find_socket_info(s);
1740
1741 if (!si) {
1742 return real_bind(s, myaddr, addrlen);
1743 }
1744
1745 si->myname_len = addrlen;
1746 si->myname = sockaddr_dup(myaddr, addrlen);
1747
1748 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
1749 if (ret == -1) return -1;
1750
1751 unlink(un_addr.sun_path);
1752
1753 ret = real_bind(s, (struct sockaddr *)&un_addr,
1754 sizeof(struct sockaddr_un));
1755
1756 if (ret == 0) {
1757 si->bound = 1;
1758 }
1759
1760 return ret;
1761}
1762
1763_PUBLIC_ int swrap_listen(int s, int backlog)
1764{
1765 int ret;
1766 struct socket_info *si = find_socket_info(s);
1767
1768 if (!si) {
1769 return real_listen(s, backlog);
1770 }
1771
1772 ret = real_listen(s, backlog);
1773
1774 return ret;
1775}
1776
1777_PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1778{
1779 struct socket_info *si = find_socket_info(s);
1780
1781 if (!si) {
1782 return real_getpeername(s, name, addrlen);
1783 }
1784
1785 if (!si->peername)
1786 {
1787 errno = ENOTCONN;
1788 return -1;
1789 }
1790
1791 memcpy(name, si->peername, si->peername_len);
1792 *addrlen = si->peername_len;
1793
1794 return 0;
1795}
1796
1797_PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1798{
1799 struct socket_info *si = find_socket_info(s);
1800
1801 if (!si) {
1802 return real_getsockname(s, name, addrlen);
1803 }
1804
1805 memcpy(name, si->myname, si->myname_len);
1806 *addrlen = si->myname_len;
1807
1808 return 0;
1809}
1810
1811_PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1812{
1813 struct socket_info *si = find_socket_info(s);
1814
1815 if (!si) {
1816 return real_getsockopt(s, level, optname, optval, optlen);
1817 }
1818
1819 if (level == SOL_SOCKET) {
1820 return real_getsockopt(s, level, optname, optval, optlen);
1821 }
1822
1823 errno = ENOPROTOOPT;
1824 return -1;
1825}
1826
1827_PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1828{
1829 struct socket_info *si = find_socket_info(s);
1830
1831 if (!si) {
1832 return real_setsockopt(s, level, optname, optval, optlen);
1833 }
1834
1835 if (level == SOL_SOCKET) {
1836 return real_setsockopt(s, level, optname, optval, optlen);
1837 }
1838
1839 switch (si->family) {
1840 case AF_INET:
1841 return 0;
1842#ifdef HAVE_IPV6
1843 case AF_INET6:
1844 return 0;
1845#endif
1846 default:
1847 errno = ENOPROTOOPT;
1848 return -1;
1849 }
1850}
1851
1852_PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
1853{
1854 struct sockaddr_un un_addr;
1855 socklen_t un_addrlen = sizeof(un_addr);
1856 int ret;
1857 struct socket_info *si = find_socket_info(s);
1858 struct sockaddr_storage ss;
1859 socklen_t ss_len = sizeof(ss);
1860
1861 if (!si) {
1862 return real_recvfrom(s, buf, len, flags, from, fromlen);
1863 }
1864
1865 if (!from) {
1866 from = (struct sockaddr *)&ss;
1867 fromlen = &ss_len;
1868 }
1869
1870 if (si->type == SOCK_STREAM) {
1871 /* cut down to 1500 byte packets for stream sockets,
1872 * which makes it easier to format PCAP capture files
1873 * (as the caller will simply continue from here) */
1874 len = MIN(len, 1500);
1875 }
1876
1877 /* irix 6.4 forgets to null terminate the sun_path string :-( */
1878 memset(&un_addr, 0, sizeof(un_addr));
1879 ret = real_recvfrom(s, buf, len, flags, (struct sockaddr *)&un_addr, &un_addrlen);
1880 if (ret == -1)
1881 return ret;
1882
1883 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
1884 si->family, from, fromlen) == -1) {
1885 return -1;
1886 }
1887
1888 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
1889
1890 return ret;
1891}
1892
1893
1894_PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
1895{
1896 struct sockaddr_un un_addr;
1897 int ret;
1898 struct socket_info *si = find_socket_info(s);
1899 int bcast = 0;
1900
1901 if (!si) {
1902 return real_sendto(s, buf, len, flags, to, tolen);
1903 }
1904
1905 if (si->connected) {
1906 if (to) {
1907 errno = EISCONN;
1908 return -1;
1909 }
1910
1911 to = si->peername;
1912 tolen = si->peername_len;
1913 }
1914
1915 switch (si->type) {
1916 case SOCK_STREAM:
1917 /* cut down to 1500 byte packets for stream sockets,
1918 * which makes it easier to format PCAP capture files
1919 * (as the caller will simply continue from here) */
1920 len = MIN(len, 1500);
1921
1922 ret = real_send(s, buf, len, flags);
1923 break;
1924 case SOCK_DGRAM:
1925 if (si->bound == 0) {
1926 ret = swrap_auto_bind(si, si->family);
1927 if (ret == -1) return -1;
1928 }
1929
1930 ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
1931 if (ret == -1) return -1;
1932
1933 if (bcast) {
1934 struct stat st;
1935 unsigned int iface;
1936 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
1937 char type;
1938
1939 type = SOCKET_TYPE_CHAR_UDP;
1940
1941 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
1942 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
1943 socket_wrapper_dir(), type, iface, prt);
1944 if (stat(un_addr.sun_path, &st) != 0) continue;
1945
1946 /* ignore the any errors in broadcast sends */
1947 real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1948 }
1949
1950 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1951
1952 return len;
1953 }
1954
1955 if (si->defer_connect) {
1956 ret = real_connect(s, (struct sockaddr *)&un_addr,
1957 sizeof(un_addr));
1958
1959 /* to give better errors */
1960 if (ret == -1 && errno == ENOENT) {
1961 errno = EHOSTUNREACH;
1962 }
1963
1964 if (ret == -1) {
1965 return ret;
1966 }
1967 si->defer_connect = 0;
1968 }
1969
1970 ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1971 break;
1972 default:
1973 ret = -1;
1974 errno = EHOSTUNREACH;
1975 break;
1976 }
1977
1978 /* to give better errors */
1979 if (ret == -1 && errno == ENOENT) {
1980 errno = EHOSTUNREACH;
1981 }
1982
1983 if (ret == -1) {
1984 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1985 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
1986 } else {
1987 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, ret);
1988 }
1989
1990 return ret;
1991}
1992
1993_PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1994{
1995 int ret;
1996 struct socket_info *si = find_socket_info(s);
1997 int value;
1998
1999 if (!si) {
2000 return real_ioctl(s, r, p);
2001 }
2002
2003 ret = real_ioctl(s, r, p);
2004
2005 switch (r) {
2006 case FIONREAD:
2007 value = *((int *)p);
2008 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2009 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
2010 } else if (value == 0) { /* END OF FILE */
2011 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
2012 }
2013 break;
2014 }
2015
2016 return ret;
2017}
2018
2019_PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
2020{
2021 int ret;
2022 struct socket_info *si = find_socket_info(s);
2023
2024 if (!si) {
2025 return real_recv(s, buf, len, flags);
2026 }
2027
2028 if (si->type == SOCK_STREAM) {
2029 /* cut down to 1500 byte packets for stream sockets,
2030 * which makes it easier to format PCAP capture files
2031 * (as the caller will simply continue from here) */
2032 len = MIN(len, 1500);
2033 }
2034
2035 ret = real_recv(s, buf, len, flags);
2036 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2037 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2038 } else if (ret == 0) { /* END OF FILE */
2039 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2040 } else if (ret > 0) {
2041 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2042 }
2043
2044 return ret;
2045}
2046
2047_PUBLIC_ ssize_t swrap_read(int s, void *buf, size_t len)
2048{
2049 int ret;
2050 struct socket_info *si = find_socket_info(s);
2051
2052 if (!si) {
2053 return real_read(s, buf, len);
2054 }
2055
2056 if (si->type == SOCK_STREAM) {
2057 /* cut down to 1500 byte packets for stream sockets,
2058 * which makes it easier to format PCAP capture files
2059 * (as the caller will simply continue from here) */
2060 len = MIN(len, 1500);
2061 }
2062
2063 ret = real_read(s, buf, len);
2064 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2065 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2066 } else if (ret == 0) { /* END OF FILE */
2067 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2068 } else if (ret > 0) {
2069 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2070 }
2071
2072 return ret;
2073}
2074
2075
2076_PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
2077{
2078 int ret;
2079 struct socket_info *si = find_socket_info(s);
2080
2081 if (!si) {
2082 return real_send(s, buf, len, flags);
2083 }
2084
2085 if (si->type == SOCK_STREAM) {
2086 /* cut down to 1500 byte packets for stream sockets,
2087 * which makes it easier to format PCAP capture files
2088 * (as the caller will simply continue from here) */
2089 len = MIN(len, 1500);
2090 }
2091
2092 if (si->defer_connect) {
2093 struct sockaddr_un un_addr;
2094 int bcast = 0;
2095
2096 if (si->bound == 0) {
2097 ret = swrap_auto_bind(si, si->family);
2098 if (ret == -1) return -1;
2099 }
2100
2101 ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
2102 &un_addr, 0, &bcast);
2103 if (ret == -1) return -1;
2104
2105 ret = real_connect(s, (struct sockaddr *)&un_addr,
2106 sizeof(un_addr));
2107
2108 /* to give better errors */
2109 if (ret == -1 && errno == ENOENT) {
2110 errno = EHOSTUNREACH;
2111 }
2112
2113 if (ret == -1) {
2114 return ret;
2115 }
2116 si->defer_connect = 0;
2117 }
2118
2119 ret = real_send(s, buf, len, flags);
2120
2121 if (ret == -1) {
2122 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2123 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2124 } else {
2125 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
2126 }
2127
2128 return ret;
2129}
2130
2131_PUBLIC_ ssize_t swrap_sendmsg(int s, const struct msghdr *msg, int flags)
2132{
2133 int ret;
2134 uint8_t *buf;
2135 off_t ofs = 0;
2136 size_t i;
2137 size_t remain;
2138
2139 struct socket_info *si = find_socket_info(s);
2140
2141 if (!si) {
2142 return real_sendmsg(s, msg, flags);
2143 }
2144
2145 if (si->defer_connect) {
2146 struct sockaddr_un un_addr;
2147 int bcast = 0;
2148
2149 if (si->bound == 0) {
2150 ret = swrap_auto_bind(si, si->family);
2151 if (ret == -1) return -1;
2152 }
2153
2154 ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
2155 &un_addr, 0, &bcast);
2156 if (ret == -1) return -1;
2157
2158 ret = real_connect(s, (struct sockaddr *)&un_addr,
2159 sizeof(un_addr));
2160
2161 /* to give better errors */
2162 if (ret == -1 && errno == ENOENT) {
2163 errno = EHOSTUNREACH;
2164 }
2165
2166 if (ret == -1) {
2167 return ret;
2168 }
2169 si->defer_connect = 0;
2170 }
2171
2172 ret = real_sendmsg(s, msg, flags);
2173 remain = ret;
2174
2175 /* we capture it as one single packet */
2176 buf = (uint8_t *)malloc(ret);
2177 if (!buf) {
2178 /* we just not capture the packet */
2179 errno = 0;
2180 return ret;
2181 }
2182
2183 for (i=0; i < msg->msg_iovlen; i++) {
2184 size_t this_time = MIN(remain, msg->msg_iov[i].iov_len);
2185 memcpy(buf + ofs,
2186 msg->msg_iov[i].iov_base,
2187 this_time);
2188 ofs += this_time;
2189 remain -= this_time;
2190 }
2191
2192 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
2193 free(buf);
2194 if (ret == -1) {
2195 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2196 }
2197
2198 return ret;
2199}
2200
2201int swrap_readv(int s, const struct iovec *vector, size_t count)
2202{
2203 int ret;
2204 struct socket_info *si = find_socket_info(s);
2205 struct iovec v;
2206
2207 if (!si) {
2208 return real_readv(s, vector, count);
2209 }
2210
2211 if (si->type == SOCK_STREAM && count > 0) {
2212 /* cut down to 1500 byte packets for stream sockets,
2213 * which makes it easier to format PCAP capture files
2214 * (as the caller will simply continue from here) */
2215 size_t i, len = 0;
2216
2217 for (i=0; i < count; i++) {
2218 size_t nlen;
2219 nlen = len + vector[i].iov_len;
2220 if (nlen > 1500) {
2221 break;
2222 }
2223 }
2224 count = i;
2225 if (count == 0) {
2226 v = vector[0];
2227 v.iov_len = MIN(v.iov_len, 1500);
2228 vector = &v;
2229 count = 1;
2230 }
2231 }
2232
2233 ret = real_readv(s, vector, count);
2234 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2235 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2236 } else if (ret == 0) { /* END OF FILE */
2237 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2238 } else if (ret > 0) {
2239 uint8_t *buf;
2240 off_t ofs = 0;
2241 size_t i;
2242 size_t remain = ret;
2243
2244 /* we capture it as one single packet */
2245 buf = (uint8_t *)malloc(ret);
2246 if (!buf) {
2247 /* we just not capture the packet */
2248 errno = 0;
2249 return ret;
2250 }
2251
2252 for (i=0; i < count; i++) {
2253 size_t this_time = MIN(remain, vector[i].iov_len);
2254 memcpy(buf + ofs,
2255 vector[i].iov_base,
2256 this_time);
2257 ofs += this_time;
2258 remain -= this_time;
2259 }
2260
2261 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2262 free(buf);
2263 }
2264
2265 return ret;
2266}
2267
2268int swrap_writev(int s, const struct iovec *vector, size_t count)
2269{
2270 int ret;
2271 struct socket_info *si = find_socket_info(s);
2272 struct iovec v;
2273
2274 if (!si) {
2275 return real_writev(s, vector, count);
2276 }
2277
2278 if (si->type == SOCK_STREAM && count > 0) {
2279 /* cut down to 1500 byte packets for stream sockets,
2280 * which makes it easier to format PCAP capture files
2281 * (as the caller will simply continue from here) */
2282 size_t i, len = 0;
2283
2284 for (i=0; i < count; i++) {
2285 size_t nlen;
2286 nlen = len + vector[i].iov_len;
2287 if (nlen > 1500) {
2288 break;
2289 }
2290 }
2291 count = i;
2292 if (count == 0) {
2293 v = vector[0];
2294 v.iov_len = MIN(v.iov_len, 1500);
2295 vector = &v;
2296 count = 1;
2297 }
2298 }
2299
2300 ret = real_writev(s, vector, count);
2301 if (ret == -1) {
2302 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2303 } else {
2304 uint8_t *buf;
2305 off_t ofs = 0;
2306 size_t i;
2307 size_t remain = ret;
2308
2309 /* we capture it as one single packet */
2310 buf = (uint8_t *)malloc(ret);
2311 if (!buf) {
2312 /* we just not capture the packet */
2313 errno = 0;
2314 return ret;
2315 }
2316
2317 for (i=0; i < count; i++) {
2318 size_t this_time = MIN(remain, vector[i].iov_len);
2319 memcpy(buf + ofs,
2320 vector[i].iov_base,
2321 this_time);
2322 ofs += this_time;
2323 remain -= this_time;
2324 }
2325
2326 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
2327 free(buf);
2328 }
2329
2330 return ret;
2331}
2332
2333_PUBLIC_ int swrap_close(int fd)
2334{
2335 struct socket_info *si = find_socket_info(fd);
2336 int ret;
2337
2338 if (!si) {
2339 return real_close(fd);
2340 }
2341
2342 SWRAP_DLIST_REMOVE(sockets, si);
2343
2344 if (si->myname && si->peername) {
2345 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
2346 }
2347
2348 ret = real_close(fd);
2349
2350 if (si->myname && si->peername) {
2351 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
2352 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
2353 }
2354
2355 if (si->path) free(si->path);
2356 if (si->myname) free(si->myname);
2357 if (si->peername) free(si->peername);
2358 if (si->tmp_path) {
2359 unlink(si->tmp_path);
2360 free(si->tmp_path);
2361 }
2362 free(si);
2363
2364 return ret;
2365}
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