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Only do the 1 second delay for sharing violations for SMB1, not SMB2.
[Samba.git] / lib / socket_wrapper / socket_wrapper.c
blob6eb4979d3fc66d1243197b48034f04a679fe99a7
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 */
156 static 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
176 static 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
183 static 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
197 static 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
212 struct 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
242 static struct socket_info *sockets;
243
244 const 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
256 unsigned 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
271 static 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 *)(void *)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 *)(void *)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
342 static 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 *)(const void *)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 *)(const void *)inaddr;
399 struct in6_addr cmp1, cmp2;
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 cmp1 = *swrap_ipv6();
415 cmp2 = in->sin6_addr;
416 cmp2.s6_addr[15] = 0;
417 if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
418 iface = in->sin6_addr.s6_addr[15];
419 } else {
420 errno = ENETUNREACH;
421 return -1;
422 }
423
424 break;
425 }
426 #endif
427 default:
428 errno = ENETUNREACH;
429 return -1;
430 }
431
432 if (prt == 0) {
433 errno = EINVAL;
434 return -1;
435 }
436
437 if (is_bcast) {
438 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
439 socket_wrapper_dir());
440 /* the caller need to do more processing */
441 return 0;
442 }
443
444 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
445 socket_wrapper_dir(), type, iface, prt);
446
447 return 0;
448 }
449
450 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
451 int *bcast)
452 {
453 char type = '\0';
454 unsigned int prt;
455 unsigned int iface;
456 struct stat st;
457 int is_bcast = 0;
458
459 if (bcast) *bcast = 0;
460
461 switch (si->family) {
462 case AF_INET: {
463 const struct sockaddr_in *in =
464 (const struct sockaddr_in *)(const void *)inaddr;
465 unsigned int addr = ntohl(in->sin_addr.s_addr);
466 char u_type = '\0';
467 char d_type = '\0';
468 char b_type = '\0';
469 char a_type = '\0';
470
471 prt = ntohs(in->sin_port);
472
473 switch (si->type) {
474 case SOCK_STREAM:
475 u_type = SOCKET_TYPE_CHAR_TCP;
476 d_type = SOCKET_TYPE_CHAR_TCP;
477 break;
478 case SOCK_DGRAM:
479 u_type = SOCKET_TYPE_CHAR_UDP;
480 d_type = SOCKET_TYPE_CHAR_UDP;
481 a_type = SOCKET_TYPE_CHAR_UDP;
482 b_type = SOCKET_TYPE_CHAR_UDP;
483 break;
484 }
485
486 if (addr == 0) {
487 /* 0.0.0.0 */
488 is_bcast = 0;
489 type = d_type;
490 iface = socket_wrapper_default_iface();
491 } else if (a_type && addr == 0xFFFFFFFF) {
492 /* 255.255.255.255 only udp */
493 is_bcast = 2;
494 type = a_type;
495 iface = socket_wrapper_default_iface();
496 } else if (b_type && addr == 0x7FFFFFFF) {
497 /* 127.255.255.255 only udp */
498 is_bcast = 1;
499 type = b_type;
500 iface = socket_wrapper_default_iface();
501 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
502 /* 127.0.0.X */
503 is_bcast = 0;
504 type = u_type;
505 iface = (addr & 0x000000FF);
506 } else {
507 errno = EADDRNOTAVAIL;
508 return -1;
509 }
510 break;
511 }
512 #ifdef HAVE_IPV6
513 case AF_INET6: {
514 const struct sockaddr_in6 *in =
515 (const struct sockaddr_in6 *)(const void *)inaddr;
516 struct in6_addr cmp1, cmp2;
517
518 switch (si->type) {
519 case SOCK_STREAM:
520 type = SOCKET_TYPE_CHAR_TCP_V6;
521 break;
522 case SOCK_DGRAM:
523 type = SOCKET_TYPE_CHAR_UDP_V6;
524 break;
525 }
526
527 /* XXX no multicast/broadcast */
528
529 prt = ntohs(in->sin6_port);
530
531 cmp1 = *swrap_ipv6();
532 cmp2 = in->sin6_addr;
533 cmp2.s6_addr[15] = 0;
534 if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
535 iface = socket_wrapper_default_iface();
536 } else if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
537 iface = in->sin6_addr.s6_addr[15];
538 } else {
539 errno = EADDRNOTAVAIL;
540 return -1;
541 }
542
543 break;
544 }
545 #endif
546 default:
547 errno = EADDRNOTAVAIL;
548 return -1;
549 }
550
551
552 if (bcast) *bcast = is_bcast;
553
554 if (prt == 0) {
555 /* handle auto-allocation of ephemeral ports */
556 for (prt = 5001; prt < 10000; prt++) {
557 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
558 socket_wrapper_dir(), type, iface, prt);
559 if (stat(un->sun_path, &st) == 0) continue;
560
561 set_port(si->family, prt, si->myname);
562 break;
563 }
564 if (prt == 10000) {
565 errno = ENFILE;
566 return -1;
567 }
568 }
569
570 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
571 socket_wrapper_dir(), type, iface, prt);
572 return 0;
573 }
574
575 static struct socket_info *find_socket_info(int fd)
576 {
577 struct socket_info *i;
578 for (i = sockets; i; i = i->next) {
579 if (i->fd == fd)
580 return i;
581 }
582
583 return NULL;
584 }
585
586 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
587 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
588 {
589 struct sockaddr *out = (struct sockaddr *)(void *)out_addr;
590 if (!out_addr)
591 return 0;
592
593 out->sa_family = AF_UNIX;
594 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
595 out->sa_len = sizeof(*out_addr);
596 #endif
597
598 switch (in_addr->sa_family) {
599 case AF_INET:
600 #ifdef HAVE_IPV6
601 case AF_INET6:
602 #endif
603 switch (si->type) {
604 case SOCK_STREAM:
605 case SOCK_DGRAM:
606 break;
607 default:
608 errno = ESOCKTNOSUPPORT;
609 return -1;
610 }
611 if (alloc_sock) {
612 return convert_in_un_alloc(si, in_addr, out_addr, bcast);
613 } else {
614 return convert_in_un_remote(si, in_addr, out_addr, bcast);
615 }
616 default:
617 break;
618 }
619
620 errno = EAFNOSUPPORT;
621 return -1;
622 }
623
624 static int sockaddr_convert_from_un(const struct socket_info *si,
625 const struct sockaddr_un *in_addr,
626 socklen_t un_addrlen,
627 int family,
628 struct sockaddr *out_addr,
629 socklen_t *out_addrlen)
630 {
631 int ret;
632
633 if (out_addr == NULL || out_addrlen == NULL)
634 return 0;
635
636 if (un_addrlen == 0) {
637 *out_addrlen = 0;
638 return 0;
639 }
640
641 switch (family) {
642 case AF_INET:
643 #ifdef HAVE_IPV6
644 case AF_INET6:
645 #endif
646 switch (si->type) {
647 case SOCK_STREAM:
648 case SOCK_DGRAM:
649 break;
650 default:
651 errno = ESOCKTNOSUPPORT;
652 return -1;
653 }
654 ret = convert_un_in(in_addr, out_addr, out_addrlen);
655 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
656 out_addr->sa_len = *out_addrlen;
657 #endif
658 return ret;
659 default:
660 break;
661 }
662
663 errno = EAFNOSUPPORT;
664 return -1;
665 }
666
667 enum swrap_packet_type {
668 SWRAP_CONNECT_SEND,
669 SWRAP_CONNECT_UNREACH,
670 SWRAP_CONNECT_RECV,
671 SWRAP_CONNECT_ACK,
672 SWRAP_ACCEPT_SEND,
673 SWRAP_ACCEPT_RECV,
674 SWRAP_ACCEPT_ACK,
675 SWRAP_RECVFROM,
676 SWRAP_SENDTO,
677 SWRAP_SENDTO_UNREACH,
678 SWRAP_PENDING_RST,
679 SWRAP_RECV,
680 SWRAP_RECV_RST,
681 SWRAP_SEND,
682 SWRAP_SEND_RST,
683 SWRAP_CLOSE_SEND,
684 SWRAP_CLOSE_RECV,
685 SWRAP_CLOSE_ACK,
686 };
687
688 struct swrap_file_hdr {
689 uint32_t magic;
690 uint16_t version_major;
691 uint16_t version_minor;
692 int32_t timezone;
693 uint32_t sigfigs;
694 uint32_t frame_max_len;
695 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
696 uint32_t link_type;
697 };
698 #define SWRAP_FILE_HDR_SIZE 24
699
700 struct swrap_packet_frame {
701 uint32_t seconds;
702 uint32_t micro_seconds;
703 uint32_t recorded_length;
704 uint32_t full_length;
705 };
706 #define SWRAP_PACKET_FRAME_SIZE 16
707
708 union swrap_packet_ip {
709 struct {
710 uint8_t ver_hdrlen;
711 uint8_t tos;
712 uint16_t packet_length;
713 uint16_t identification;
714 uint8_t flags;
715 uint8_t fragment;
716 uint8_t ttl;
717 uint8_t protocol;
718 uint16_t hdr_checksum;
719 uint32_t src_addr;
720 uint32_t dest_addr;
721 } v4;
722 #define SWRAP_PACKET_IP_V4_SIZE 20
723 struct {
724 uint8_t ver_prio;
725 uint8_t flow_label_high;
726 uint16_t flow_label_low;
727 uint16_t payload_length;
728 uint8_t next_header;
729 uint8_t hop_limit;
730 uint8_t src_addr[16];
731 uint8_t dest_addr[16];
732 } v6;
733 #define SWRAP_PACKET_IP_V6_SIZE 40
734 };
735 #define SWRAP_PACKET_IP_SIZE 40
736
737 union swrap_packet_payload {
738 struct {
739 uint16_t source_port;
740 uint16_t dest_port;
741 uint32_t seq_num;
742 uint32_t ack_num;
743 uint8_t hdr_length;
744 uint8_t control;
745 uint16_t window;
746 uint16_t checksum;
747 uint16_t urg;
748 } tcp;
749 #define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
750 struct {
751 uint16_t source_port;
752 uint16_t dest_port;
753 uint16_t length;
754 uint16_t checksum;
755 } udp;
756 #define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
757 struct {
758 uint8_t type;
759 uint8_t code;
760 uint16_t checksum;
761 uint32_t unused;
762 } icmp4;
763 #define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
764 struct {
765 uint8_t type;
766 uint8_t code;
767 uint16_t checksum;
768 uint32_t unused;
769 } icmp6;
770 #define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
771 };
772 #define SWRAP_PACKET_PAYLOAD_SIZE 20
773
774 #define SWRAP_PACKET_MIN_ALLOC \
775 (SWRAP_PACKET_FRAME_SIZE + \
776 SWRAP_PACKET_IP_SIZE + \
777 SWRAP_PACKET_PAYLOAD_SIZE)
778
779 static const char *socket_wrapper_pcap_file(void)
780 {
781 static int initialized = 0;
782 static const char *s = NULL;
783 static const struct swrap_file_hdr h;
784 static const struct swrap_packet_frame f;
785 static const union swrap_packet_ip i;
786 static const union swrap_packet_payload p;
787
788 if (initialized == 1) {
789 return s;
790 }
791 initialized = 1;
792
793 /*
794 * TODO: don't use the structs use plain buffer offsets
795 * and PUSH_U8(), PUSH_U16() and PUSH_U32()
796 *
797 * for now make sure we disable PCAP support
798 * if the struct has alignment!
799 */
800 if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
801 return NULL;
802 }
803 if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
804 return NULL;
805 }
806 if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
807 return NULL;
808 }
809 if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
810 return NULL;
811 }
812 if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
813 return NULL;
814 }
815 if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
816 return NULL;
817 }
818 if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
819 return NULL;
820 }
821 if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
822 return NULL;
823 }
824 if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
825 return NULL;
826 }
827 if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
828 return NULL;
829 }
830
831 s = getenv("SOCKET_WRAPPER_PCAP_FILE");
832 if (s == NULL) {
833 return NULL;
834 }
835 if (strncmp(s, "./", 2) == 0) {
836 s += 2;
837 }
838 return s;
839 }
840
841 static uint8_t *swrap_packet_init(struct timeval *tval,
842 const struct sockaddr *src,
843 const struct sockaddr *dest,
844 int socket_type,
845 const uint8_t *payload,
846 size_t payload_len,
847 unsigned long tcp_seqno,
848 unsigned long tcp_ack,
849 unsigned char tcp_ctl,
850 int unreachable,
851 size_t *_packet_len)
852 {
853 uint8_t *base;
854 uint8_t *buf;
855 struct swrap_packet_frame *frame;
856 union swrap_packet_ip *ip;
857 union swrap_packet_payload *pay;
858 size_t packet_len;
859 size_t alloc_len;
860 size_t nonwire_len = sizeof(*frame);
861 size_t wire_hdr_len = 0;
862 size_t wire_len = 0;
863 size_t ip_hdr_len = 0;
864 size_t icmp_hdr_len = 0;
865 size_t icmp_truncate_len = 0;
866 uint8_t protocol = 0, icmp_protocol = 0;
867 const struct sockaddr_in *src_in = NULL;
868 const struct sockaddr_in *dest_in = NULL;
869 #ifdef HAVE_IPV6
870 const struct sockaddr_in6 *src_in6 = NULL;
871 const struct sockaddr_in6 *dest_in6 = NULL;
872 #endif
873 uint16_t src_port;
874 uint16_t dest_port;
875
876 switch (src->sa_family) {
877 case AF_INET:
878 src_in = (const struct sockaddr_in *)src;
879 dest_in = (const struct sockaddr_in *)dest;
880 src_port = src_in->sin_port;
881 dest_port = dest_in->sin_port;
882 ip_hdr_len = sizeof(ip->v4);
883 break;
884 #ifdef HAVE_IPV6
885 case AF_INET6:
886 src_in6 = (const struct sockaddr_in6 *)src;
887 dest_in6 = (const struct sockaddr_in6 *)dest;
888 src_port = src_in6->sin6_port;
889 dest_port = dest_in6->sin6_port;
890 ip_hdr_len = sizeof(ip->v6);
891 break;
892 #endif
893 default:
894 return NULL;
895 }
896
897 switch (socket_type) {
898 case SOCK_STREAM:
899 protocol = 0x06; /* TCP */
900 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
901 wire_len = wire_hdr_len + payload_len;
902 break;
903
904 case SOCK_DGRAM:
905 protocol = 0x11; /* UDP */
906 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
907 wire_len = wire_hdr_len + payload_len;
908 break;
909
910 default:
911 return NULL;
912 }
913
914 if (unreachable) {
915 icmp_protocol = protocol;
916 switch (src->sa_family) {
917 case AF_INET:
918 protocol = 0x01; /* ICMPv4 */
919 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
920 break;
921 #ifdef HAVE_IPV6
922 case AF_INET6:
923 protocol = 0x3A; /* ICMPv6 */
924 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
925 break;
926 #endif
927 }
928 if (wire_len > 64 ) {
929 icmp_truncate_len = wire_len - 64;
930 }
931 wire_hdr_len += icmp_hdr_len;
932 wire_len += icmp_hdr_len;
933 }
934
935 packet_len = nonwire_len + wire_len;
936 alloc_len = packet_len;
937 if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
938 alloc_len = SWRAP_PACKET_MIN_ALLOC;
939 }
940
941 base = (uint8_t *)malloc(alloc_len);
942 if (!base) return NULL;
943
944 buf = base;
945
946 frame = (struct swrap_packet_frame *)buf;
947 frame->seconds = tval->tv_sec;
948 frame->micro_seconds = tval->tv_usec;
949 frame->recorded_length = wire_len - icmp_truncate_len;
950 frame->full_length = wire_len - icmp_truncate_len;
951 buf += SWRAP_PACKET_FRAME_SIZE;
952
953 ip = (union swrap_packet_ip *)buf;
954 switch (src->sa_family) {
955 case AF_INET:
956 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
957 ip->v4.tos = 0x00;
958 ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
959 ip->v4.identification = htons(0xFFFF);
960 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
961 ip->v4.fragment = htons(0x0000);
962 ip->v4.ttl = 0xFF;
963 ip->v4.protocol = protocol;
964 ip->v4.hdr_checksum = htons(0x0000);
965 ip->v4.src_addr = src_in->sin_addr.s_addr;
966 ip->v4.dest_addr = dest_in->sin_addr.s_addr;
967 buf += SWRAP_PACKET_IP_V4_SIZE;
968 break;
969 #ifdef HAVE_IPV6
970 case AF_INET6:
971 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
972 ip->v6.flow_label_high = 0x00;
973 ip->v6.flow_label_low = 0x0000;
974 ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
975 ip->v6.next_header = protocol;
976 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
977 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
978 buf += SWRAP_PACKET_IP_V6_SIZE;
979 break;
980 #endif
981 }
982
983 if (unreachable) {
984 pay = (union swrap_packet_payload *)buf;
985 switch (src->sa_family) {
986 case AF_INET:
987 pay->icmp4.type = 0x03; /* destination unreachable */
988 pay->icmp4.code = 0x01; /* host unreachable */
989 pay->icmp4.checksum = htons(0x0000);
990 pay->icmp4.unused = htonl(0x00000000);
991 buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
992
993 /* set the ip header in the ICMP payload */
994 ip = (union swrap_packet_ip *)buf;
995 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
996 ip->v4.tos = 0x00;
997 ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
998 ip->v4.identification = htons(0xFFFF);
999 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
1000 ip->v4.fragment = htons(0x0000);
1001 ip->v4.ttl = 0xFF;
1002 ip->v4.protocol = icmp_protocol;
1003 ip->v4.hdr_checksum = htons(0x0000);
1004 ip->v4.src_addr = dest_in->sin_addr.s_addr;
1005 ip->v4.dest_addr = src_in->sin_addr.s_addr;
1006 buf += SWRAP_PACKET_IP_V4_SIZE;
1007
1008 src_port = dest_in->sin_port;
1009 dest_port = src_in->sin_port;
1010 break;
1011 #ifdef HAVE_IPV6
1012 case AF_INET6:
1013 pay->icmp6.type = 0x01; /* destination unreachable */
1014 pay->icmp6.code = 0x03; /* address unreachable */
1015 pay->icmp6.checksum = htons(0x0000);
1016 pay->icmp6.unused = htonl(0x00000000);
1017 buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
1018
1019 /* set the ip header in the ICMP payload */
1020 ip = (union swrap_packet_ip *)buf;
1021 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
1022 ip->v6.flow_label_high = 0x00;
1023 ip->v6.flow_label_low = 0x0000;
1024 ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
1025 ip->v6.next_header = protocol;
1026 memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
1027 memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
1028 buf += SWRAP_PACKET_IP_V6_SIZE;
1029
1030 src_port = dest_in6->sin6_port;
1031 dest_port = src_in6->sin6_port;
1032 break;
1033 #endif
1034 }
1035 }
1036
1037 pay = (union swrap_packet_payload *)buf;
1038
1039 switch (socket_type) {
1040 case SOCK_STREAM:
1041 pay->tcp.source_port = src_port;
1042 pay->tcp.dest_port = dest_port;
1043 pay->tcp.seq_num = htonl(tcp_seqno);
1044 pay->tcp.ack_num = htonl(tcp_ack);
1045 pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
1046 pay->tcp.control = tcp_ctl;
1047 pay->tcp.window = htons(0x7FFF);
1048 pay->tcp.checksum = htons(0x0000);
1049 pay->tcp.urg = htons(0x0000);
1050 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
1051
1052 break;
1053
1054 case SOCK_DGRAM:
1055 pay->udp.source_port = src_port;
1056 pay->udp.dest_port = dest_port;
1057 pay->udp.length = htons(8 + payload_len);
1058 pay->udp.checksum = htons(0x0000);
1059 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
1060
1061 break;
1062 }
1063
1064 if (payload && payload_len > 0) {
1065 memcpy(buf, payload, payload_len);
1066 }
1067
1068 *_packet_len = packet_len - icmp_truncate_len;
1069 return base;
1070 }
1071
1072 static int swrap_get_pcap_fd(const char *fname)
1073 {
1074 static int fd = -1;
1075
1076 if (fd != -1) return fd;
1077
1078 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1079 if (fd != -1) {
1080 struct swrap_file_hdr file_hdr;
1081 file_hdr.magic = 0xA1B2C3D4;
1082 file_hdr.version_major = 0x0002;
1083 file_hdr.version_minor = 0x0004;
1084 file_hdr.timezone = 0x00000000;
1085 file_hdr.sigfigs = 0x00000000;
1086 file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
1087 file_hdr.link_type = 0x0065; /* 101 RAW IP */
1088
1089 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1090 close(fd);
1091 fd = -1;
1092 }
1093 return fd;
1094 }
1095
1096 fd = open(fname, O_WRONLY|O_APPEND, 0644);
1097
1098 return fd;
1099 }
1100
1101 static uint8_t *swrap_marshall_packet(struct socket_info *si,
1102 const struct sockaddr *addr,
1103 enum swrap_packet_type type,
1104 const void *buf, size_t len,
1105 size_t *packet_len)
1106 {
1107 const struct sockaddr *src_addr;
1108 const struct sockaddr *dest_addr;
1109 unsigned long tcp_seqno = 0;
1110 unsigned long tcp_ack = 0;
1111 unsigned char tcp_ctl = 0;
1112 int unreachable = 0;
1113
1114 struct timeval tv;
1115
1116 switch (si->family) {
1117 case AF_INET:
1118 break;
1119 #ifdef HAVE_IPV6
1120 case AF_INET6:
1121 break;
1122 #endif
1123 default:
1124 return NULL;
1125 }
1126
1127 switch (type) {
1128 case SWRAP_CONNECT_SEND:
1129 if (si->type != SOCK_STREAM) return NULL;
1130
1131 src_addr = si->myname;
1132 dest_addr = addr;
1133
1134 tcp_seqno = si->io.pck_snd;
1135 tcp_ack = si->io.pck_rcv;
1136 tcp_ctl = 0x02; /* SYN */
1137
1138 si->io.pck_snd += 1;
1139
1140 break;
1141
1142 case SWRAP_CONNECT_RECV:
1143 if (si->type != SOCK_STREAM) return NULL;
1144
1145 dest_addr = si->myname;
1146 src_addr = addr;
1147
1148 tcp_seqno = si->io.pck_rcv;
1149 tcp_ack = si->io.pck_snd;
1150 tcp_ctl = 0x12; /** SYN,ACK */
1151
1152 si->io.pck_rcv += 1;
1153
1154 break;
1155
1156 case SWRAP_CONNECT_UNREACH:
1157 if (si->type != SOCK_STREAM) return NULL;
1158
1159 dest_addr = si->myname;
1160 src_addr = addr;
1161
1162 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
1163 tcp_seqno = si->io.pck_snd - 1;
1164 tcp_ack = si->io.pck_rcv;
1165 tcp_ctl = 0x02; /* SYN */
1166 unreachable = 1;
1167
1168 break;
1169
1170 case SWRAP_CONNECT_ACK:
1171 if (si->type != SOCK_STREAM) return NULL;
1172
1173 src_addr = si->myname;
1174 dest_addr = addr;
1175
1176 tcp_seqno = si->io.pck_snd;
1177 tcp_ack = si->io.pck_rcv;
1178 tcp_ctl = 0x10; /* ACK */
1179
1180 break;
1181
1182 case SWRAP_ACCEPT_SEND:
1183 if (si->type != SOCK_STREAM) return NULL;
1184
1185 dest_addr = si->myname;
1186 src_addr = addr;
1187
1188 tcp_seqno = si->io.pck_rcv;
1189 tcp_ack = si->io.pck_snd;
1190 tcp_ctl = 0x02; /* SYN */
1191
1192 si->io.pck_rcv += 1;
1193
1194 break;
1195
1196 case SWRAP_ACCEPT_RECV:
1197 if (si->type != SOCK_STREAM) return NULL;
1198
1199 src_addr = si->myname;
1200 dest_addr = addr;
1201
1202 tcp_seqno = si->io.pck_snd;
1203 tcp_ack = si->io.pck_rcv;
1204 tcp_ctl = 0x12; /* SYN,ACK */
1205
1206 si->io.pck_snd += 1;
1207
1208 break;
1209
1210 case SWRAP_ACCEPT_ACK:
1211 if (si->type != SOCK_STREAM) return NULL;
1212
1213 dest_addr = si->myname;
1214 src_addr = addr;
1215
1216 tcp_seqno = si->io.pck_rcv;
1217 tcp_ack = si->io.pck_snd;
1218 tcp_ctl = 0x10; /* ACK */
1219
1220 break;
1221
1222 case SWRAP_SEND:
1223 src_addr = si->myname;
1224 dest_addr = si->peername;
1225
1226 tcp_seqno = si->io.pck_snd;
1227 tcp_ack = si->io.pck_rcv;
1228 tcp_ctl = 0x18; /* PSH,ACK */
1229
1230 si->io.pck_snd += len;
1231
1232 break;
1233
1234 case SWRAP_SEND_RST:
1235 dest_addr = si->myname;
1236 src_addr = si->peername;
1237
1238 if (si->type == SOCK_DGRAM) {
1239 return swrap_marshall_packet(si, si->peername,
1240 SWRAP_SENDTO_UNREACH,
1241 buf, len, packet_len);
1242 }
1243
1244 tcp_seqno = si->io.pck_rcv;
1245 tcp_ack = si->io.pck_snd;
1246 tcp_ctl = 0x14; /** RST,ACK */
1247
1248 break;
1249
1250 case SWRAP_PENDING_RST:
1251 dest_addr = si->myname;
1252 src_addr = si->peername;
1253
1254 if (si->type == SOCK_DGRAM) {
1255 return NULL;
1256 }
1257
1258 tcp_seqno = si->io.pck_rcv;
1259 tcp_ack = si->io.pck_snd;
1260 tcp_ctl = 0x14; /* RST,ACK */
1261
1262 break;
1263
1264 case SWRAP_RECV:
1265 dest_addr = si->myname;
1266 src_addr = si->peername;
1267
1268 tcp_seqno = si->io.pck_rcv;
1269 tcp_ack = si->io.pck_snd;
1270 tcp_ctl = 0x18; /* PSH,ACK */
1271
1272 si->io.pck_rcv += len;
1273
1274 break;
1275
1276 case SWRAP_RECV_RST:
1277 dest_addr = si->myname;
1278 src_addr = si->peername;
1279
1280 if (si->type == SOCK_DGRAM) {
1281 return NULL;
1282 }
1283
1284 tcp_seqno = si->io.pck_rcv;
1285 tcp_ack = si->io.pck_snd;
1286 tcp_ctl = 0x14; /* RST,ACK */
1287
1288 break;
1289
1290 case SWRAP_SENDTO:
1291 src_addr = si->myname;
1292 dest_addr = addr;
1293
1294 si->io.pck_snd += len;
1295
1296 break;
1297
1298 case SWRAP_SENDTO_UNREACH:
1299 dest_addr = si->myname;
1300 src_addr = addr;
1301
1302 unreachable = 1;
1303
1304 break;
1305
1306 case SWRAP_RECVFROM:
1307 dest_addr = si->myname;
1308 src_addr = addr;
1309
1310 si->io.pck_rcv += len;
1311
1312 break;
1313
1314 case SWRAP_CLOSE_SEND:
1315 if (si->type != SOCK_STREAM) return NULL;
1316
1317 src_addr = si->myname;
1318 dest_addr = si->peername;
1319
1320 tcp_seqno = si->io.pck_snd;
1321 tcp_ack = si->io.pck_rcv;
1322 tcp_ctl = 0x11; /* FIN, ACK */
1323
1324 si->io.pck_snd += 1;
1325
1326 break;
1327
1328 case SWRAP_CLOSE_RECV:
1329 if (si->type != SOCK_STREAM) return NULL;
1330
1331 dest_addr = si->myname;
1332 src_addr = si->peername;
1333
1334 tcp_seqno = si->io.pck_rcv;
1335 tcp_ack = si->io.pck_snd;
1336 tcp_ctl = 0x11; /* FIN,ACK */
1337
1338 si->io.pck_rcv += 1;
1339
1340 break;
1341
1342 case SWRAP_CLOSE_ACK:
1343 if (si->type != SOCK_STREAM) return NULL;
1344
1345 src_addr = si->myname;
1346 dest_addr = si->peername;
1347
1348 tcp_seqno = si->io.pck_snd;
1349 tcp_ack = si->io.pck_rcv;
1350 tcp_ctl = 0x10; /* ACK */
1351
1352 break;
1353 default:
1354 return NULL;
1355 }
1356
1357 swrapGetTimeOfDay(&tv);
1358
1359 return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1360 (const uint8_t *)buf, len,
1361 tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1362 packet_len);
1363 }
1364
1365 static void swrap_dump_packet(struct socket_info *si,
1366 const struct sockaddr *addr,
1367 enum swrap_packet_type type,
1368 const void *buf, size_t len)
1369 {
1370 const char *file_name;
1371 uint8_t *packet;
1372 size_t packet_len = 0;
1373 int fd;
1374
1375 file_name = socket_wrapper_pcap_file();
1376 if (!file_name) {
1377 return;
1378 }
1379
1380 packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1381 if (!packet) {
1382 return;
1383 }
1384
1385 fd = swrap_get_pcap_fd(file_name);
1386 if (fd != -1) {
1387 if (write(fd, packet, packet_len) != packet_len) {
1388 free(packet);
1389 return;
1390 }
1391 }
1392
1393 free(packet);
1394 }
1395
1396 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
1397 {
1398 struct socket_info *si;
1399 int fd;
1400 int real_type = type;
1401 #ifdef SOCK_CLOEXEC
1402 real_type &= ~SOCK_CLOEXEC;
1403 #endif
1404 #ifdef SOCK_NONBLOCK
1405 real_type &= ~SOCK_NONBLOCK;
1406 #endif
1407
1408 if (!socket_wrapper_dir()) {
1409 return real_socket(family, type, protocol);
1410 }
1411
1412 switch (family) {
1413 case AF_INET:
1414 #ifdef HAVE_IPV6
1415 case AF_INET6:
1416 #endif
1417 break;
1418 case AF_UNIX:
1419 return real_socket(family, type, protocol);
1420 default:
1421 errno = EAFNOSUPPORT;
1422 return -1;
1423 }
1424
1425 switch (real_type) {
1426 case SOCK_STREAM:
1427 break;
1428 case SOCK_DGRAM:
1429 break;
1430 default:
1431 errno = EPROTONOSUPPORT;
1432 return -1;
1433 }
1434
1435 switch (protocol) {
1436 case 0:
1437 break;
1438 case 6:
1439 if (real_type == SOCK_STREAM) {
1440 break;
1441 }
1442 /*fall through*/
1443 case 17:
1444 if (real_type == SOCK_DGRAM) {
1445 break;
1446 }
1447 /*fall through*/
1448 default:
1449 errno = EPROTONOSUPPORT;
1450 return -1;
1451 }
1452
1453 /* We must call real_socket with type, from the caller, not the version we removed
1454 SOCK_CLOEXEC and SOCK_NONBLOCK from */
1455 fd = real_socket(AF_UNIX, type, 0);
1456
1457 if (fd == -1) return -1;
1458
1459 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1460
1461 si->family = family;
1462
1463 /* however, the rest of the socket_wrapper code expects just
1464 * the type, not the flags */
1465 si->type = real_type;
1466 si->protocol = protocol;
1467 si->fd = fd;
1468
1469 SWRAP_DLIST_ADD(sockets, si);
1470
1471 return si->fd;
1472 }
1473
1474 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1475 {
1476 struct socket_info *parent_si, *child_si;
1477 int fd;
1478 struct sockaddr_un un_addr;
1479 socklen_t un_addrlen = sizeof(un_addr);
1480 struct sockaddr_un un_my_addr;
1481 socklen_t un_my_addrlen = sizeof(un_my_addr);
1482 struct sockaddr *my_addr;
1483 socklen_t my_addrlen, len;
1484 int ret;
1485
1486 parent_si = find_socket_info(s);
1487 if (!parent_si) {
1488 return real_accept(s, addr, addrlen);
1489 }
1490
1491 /*
1492 * assume out sockaddr have the same size as the in parent
1493 * socket family
1494 */
1495 my_addrlen = socket_length(parent_si->family);
1496 if (my_addrlen <= 0) {
1497 errno = EINVAL;
1498 return -1;
1499 }
1500
1501 my_addr = (struct sockaddr *)malloc(my_addrlen);
1502 if (my_addr == NULL) {
1503 return -1;
1504 }
1505
1506 memset(&un_addr, 0, sizeof(un_addr));
1507 memset(&un_my_addr, 0, sizeof(un_my_addr));
1508
1509 ret = real_accept(s, (struct sockaddr *)(void *)&un_addr, &un_addrlen);
1510 if (ret == -1) {
1511 free(my_addr);
1512 return ret;
1513 }
1514
1515 fd = ret;
1516
1517 len = my_addrlen;
1518 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1519 parent_si->family, my_addr, &len);
1520 if (ret == -1) {
1521 free(my_addr);
1522 close(fd);
1523 return ret;
1524 }
1525
1526 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1527 memset(child_si, 0, sizeof(*child_si));
1528
1529 child_si->fd = fd;
1530 child_si->family = parent_si->family;
1531 child_si->type = parent_si->type;
1532 child_si->protocol = parent_si->protocol;
1533 child_si->bound = 1;
1534 child_si->is_server = 1;
1535 child_si->connected = 1;
1536
1537 child_si->peername_len = len;
1538 child_si->peername = sockaddr_dup(my_addr, len);
1539
1540 if (addr != NULL && addrlen != NULL) {
1541 size_t copy_len = MIN(*addrlen, len);
1542 if (copy_len > 0) {
1543 memcpy(addr, my_addr, copy_len);
1544 }
1545 *addrlen = len;
1546 }
1547
1548 ret = real_getsockname(fd, (struct sockaddr *)(void *)&un_my_addr,
1549 &un_my_addrlen);
1550 if (ret == -1) {
1551 free(child_si);
1552 close(fd);
1553 return ret;
1554 }
1555
1556 len = my_addrlen;
1557 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1558 child_si->family, my_addr, &len);
1559 if (ret == -1) {
1560 free(child_si);
1561 free(my_addr);
1562 close(fd);
1563 return ret;
1564 }
1565
1566 child_si->myname_len = len;
1567 child_si->myname = sockaddr_dup(my_addr, len);
1568 free(my_addr);
1569
1570 SWRAP_DLIST_ADD(sockets, child_si);
1571
1572 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1573 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1574 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1575
1576 return fd;
1577 }
1578
1579 static int autobind_start_init;
1580 static int autobind_start;
1581
1582 /* using sendto() or connect() on an unbound socket would give the
1583 recipient no way to reply, as unlike UDP and TCP, a unix domain
1584 socket can't auto-assign emphemeral port numbers, so we need to
1585 assign it here.
1586 Note: this might change the family from ipv6 to ipv4
1587 */
1588 static int swrap_auto_bind(struct socket_info *si, int family)
1589 {
1590 struct sockaddr_un un_addr;
1591 int i;
1592 char type;
1593 int ret;
1594 int port;
1595 struct stat st;
1596
1597 if (autobind_start_init != 1) {
1598 autobind_start_init = 1;
1599 autobind_start = getpid();
1600 autobind_start %= 50000;
1601 autobind_start += 10000;
1602 }
1603
1604 un_addr.sun_family = AF_UNIX;
1605
1606 switch (family) {
1607 case AF_INET: {
1608 struct sockaddr_in in;
1609
1610 switch (si->type) {
1611 case SOCK_STREAM:
1612 type = SOCKET_TYPE_CHAR_TCP;
1613 break;
1614 case SOCK_DGRAM:
1615 type = SOCKET_TYPE_CHAR_UDP;
1616 break;
1617 default:
1618 errno = ESOCKTNOSUPPORT;
1619 return -1;
1620 }
1621
1622 memset(&in, 0, sizeof(in));
1623 in.sin_family = AF_INET;
1624 in.sin_addr.s_addr = htonl(127<<24 |
1625 socket_wrapper_default_iface());
1626
1627 si->myname_len = sizeof(in);
1628 si->myname = sockaddr_dup(&in, si->myname_len);
1629 break;
1630 }
1631 #ifdef HAVE_IPV6
1632 case AF_INET6: {
1633 struct sockaddr_in6 in6;
1634
1635 if (si->family != family) {
1636 errno = ENETUNREACH;
1637 return -1;
1638 }
1639
1640 switch (si->type) {
1641 case SOCK_STREAM:
1642 type = SOCKET_TYPE_CHAR_TCP_V6;
1643 break;
1644 case SOCK_DGRAM:
1645 type = SOCKET_TYPE_CHAR_UDP_V6;
1646 break;
1647 default:
1648 errno = ESOCKTNOSUPPORT;
1649 return -1;
1650 }
1651
1652 memset(&in6, 0, sizeof(in6));
1653 in6.sin6_family = AF_INET6;
1654 in6.sin6_addr = *swrap_ipv6();
1655 in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
1656 si->myname_len = sizeof(in6);
1657 si->myname = sockaddr_dup(&in6, si->myname_len);
1658 break;
1659 }
1660 #endif
1661 default:
1662 errno = ESOCKTNOSUPPORT;
1663 return -1;
1664 }
1665
1666 if (autobind_start > 60000) {
1667 autobind_start = 10000;
1668 }
1669
1670 for (i=0;i<1000;i++) {
1671 port = autobind_start + i;
1672 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1673 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1674 type, socket_wrapper_default_iface(), port);
1675 if (stat(un_addr.sun_path, &st) == 0) continue;
1676
1677 ret = real_bind(si->fd, (struct sockaddr *)(void *)&un_addr,
1678 sizeof(un_addr));
1679 if (ret == -1) return ret;
1680
1681 si->tmp_path = strdup(un_addr.sun_path);
1682 si->bound = 1;
1683 autobind_start = port + 1;
1684 break;
1685 }
1686 if (i == 1000) {
1687 errno = ENFILE;
1688 return -1;
1689 }
1690
1691 si->family = family;
1692 set_port(si->family, port, si->myname);
1693
1694 return 0;
1695 }
1696
1697
1698 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1699 {
1700 int ret;
1701 struct sockaddr_un un_addr;
1702 struct socket_info *si = find_socket_info(s);
1703 int bcast = 0;
1704
1705 if (!si) {
1706 return real_connect(s, serv_addr, addrlen);
1707 }
1708
1709 if (si->bound == 0) {
1710 ret = swrap_auto_bind(si, serv_addr->sa_family);
1711 if (ret == -1) return -1;
1712 }
1713
1714 if (si->family != serv_addr->sa_family) {
1715 errno = EINVAL;
1716 return -1;
1717 }
1718
1719 ret = sockaddr_convert_to_un(si, serv_addr,
1720 addrlen, &un_addr, 0, &bcast);
1721 if (ret == -1) return -1;
1722
1723 if (bcast) {
1724 errno = ENETUNREACH;
1725 return -1;
1726 }
1727
1728 if (si->type == SOCK_DGRAM) {
1729 si->defer_connect = 1;
1730 ret = 0;
1731 } else {
1732 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1733
1734 ret = real_connect(s, (struct sockaddr *)(void *)&un_addr,
1735 sizeof(struct sockaddr_un));
1736 }
1737
1738 /* to give better errors */
1739 if (ret == -1 && errno == ENOENT) {
1740 errno = EHOSTUNREACH;
1741 }
1742
1743 if (ret == 0) {
1744 si->peername_len = addrlen;
1745 si->peername = sockaddr_dup(serv_addr, addrlen);
1746 si->connected = 1;
1747
1748 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1749 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1750 } else {
1751 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1752 }
1753
1754 return ret;
1755 }
1756
1757 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1758 {
1759 int ret;
1760 struct sockaddr_un un_addr;
1761 struct socket_info *si = find_socket_info(s);
1762
1763 if (!si) {
1764 return real_bind(s, myaddr, addrlen);
1765 }
1766
1767 si->myname_len = addrlen;
1768 si->myname = sockaddr_dup(myaddr, addrlen);
1769
1770 ret = sockaddr_convert_to_un(si, myaddr, addrlen, &un_addr, 1, &si->bcast);
1771 if (ret == -1) return -1;
1772
1773 unlink(un_addr.sun_path);
1774
1775 ret = real_bind(s, (struct sockaddr *)(void *)&un_addr,
1776 sizeof(struct sockaddr_un));
1777
1778 if (ret == 0) {
1779 si->bound = 1;
1780 }
1781
1782 return ret;
1783 }
1784
1785 _PUBLIC_ int swrap_listen(int s, int backlog)
1786 {
1787 int ret;
1788 struct socket_info *si = find_socket_info(s);
1789
1790 if (!si) {
1791 return real_listen(s, backlog);
1792 }
1793
1794 ret = real_listen(s, backlog);
1795
1796 return ret;
1797 }
1798
1799 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1800 {
1801 struct socket_info *si = find_socket_info(s);
1802
1803 if (!si) {
1804 return real_getpeername(s, name, addrlen);
1805 }
1806
1807 if (!si->peername)
1808 {
1809 errno = ENOTCONN;
1810 return -1;
1811 }
1812
1813 memcpy(name, si->peername, si->peername_len);
1814 *addrlen = si->peername_len;
1815
1816 return 0;
1817 }
1818
1819 _PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1820 {
1821 struct socket_info *si = find_socket_info(s);
1822
1823 if (!si) {
1824 return real_getsockname(s, name, addrlen);
1825 }
1826
1827 memcpy(name, si->myname, si->myname_len);
1828 *addrlen = si->myname_len;
1829
1830 return 0;
1831 }
1832
1833 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1834 {
1835 struct socket_info *si = find_socket_info(s);
1836
1837 if (!si) {
1838 return real_getsockopt(s, level, optname, optval, optlen);
1839 }
1840
1841 if (level == SOL_SOCKET) {
1842 return real_getsockopt(s, level, optname, optval, optlen);
1843 }
1844
1845 errno = ENOPROTOOPT;
1846 return -1;
1847 }
1848
1849 _PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1850 {
1851 struct socket_info *si = find_socket_info(s);
1852
1853 if (!si) {
1854 return real_setsockopt(s, level, optname, optval, optlen);
1855 }
1856
1857 if (level == SOL_SOCKET) {
1858 return real_setsockopt(s, level, optname, optval, optlen);
1859 }
1860
1861 switch (si->family) {
1862 case AF_INET:
1863 return 0;
1864 #ifdef HAVE_IPV6
1865 case AF_INET6:
1866 return 0;
1867 #endif
1868 default:
1869 errno = ENOPROTOOPT;
1870 return -1;
1871 }
1872 }
1873
1874 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1875 {
1876 int ret;
1877 struct socket_info *si = find_socket_info(s);
1878 int value;
1879
1880 if (!si) {
1881 return real_ioctl(s, r, p);
1882 }
1883
1884 ret = real_ioctl(s, r, p);
1885
1886 switch (r) {
1887 case FIONREAD:
1888 value = *((int *)p);
1889 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1890 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1891 } else if (value == 0) { /* END OF FILE */
1892 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1893 }
1894 break;
1895 }
1896
1897 return ret;
1898 }
1899
1900 static ssize_t swrap_sendmsg_before(struct socket_info *si,
1901 struct msghdr *msg,
1902 struct iovec *tmp_iov,
1903 struct sockaddr_un *tmp_un,
1904 const struct sockaddr_un **to_un,
1905 const struct sockaddr **to,
1906 int *bcast)
1907 {
1908 size_t i, len = 0;
1909 ssize_t ret;
1910
1911 if (to_un) {
1912 *to_un = NULL;
1913 }
1914 if (to) {
1915 *to = NULL;
1916 }
1917 if (bcast) {
1918 *bcast = 0;
1919 }
1920
1921 switch (si->type) {
1922 case SOCK_STREAM:
1923 if (!si->connected) {
1924 errno = ENOTCONN;
1925 return -1;
1926 }
1927
1928 if (msg->msg_iovlen == 0) {
1929 break;
1930 }
1931
1932 /*
1933 * cut down to 1500 byte packets for stream sockets,
1934 * which makes it easier to format PCAP capture files
1935 * (as the caller will simply continue from here)
1936 */
1937
1938 for (i=0; i < msg->msg_iovlen; i++) {
1939 size_t nlen;
1940 nlen = len + msg->msg_iov[i].iov_len;
1941 if (nlen > 1500) {
1942 break;
1943 }
1944 }
1945 msg->msg_iovlen = i;
1946 if (msg->msg_iovlen == 0) {
1947 *tmp_iov = msg->msg_iov[0];
1948 tmp_iov->iov_len = MIN(tmp_iov->iov_len, 1500);
1949 msg->msg_iov = tmp_iov;
1950 msg->msg_iovlen = 1;
1951 }
1952 break;
1953
1954 case SOCK_DGRAM:
1955 if (si->connected) {
1956 if (msg->msg_name) {
1957 errno = EISCONN;
1958 return -1;
1959 }
1960 } else {
1961 const struct sockaddr *msg_name;
1962 msg_name = (const struct sockaddr *)msg->msg_name;
1963
1964 if (msg_name == NULL) {
1965 errno = ENOTCONN;
1966 return -1;
1967 }
1968
1969
1970 ret = sockaddr_convert_to_un(si, msg_name, msg->msg_namelen,
1971 tmp_un, 0, bcast);
1972 if (ret == -1) return -1;
1973
1974 if (to_un) {
1975 *to_un = tmp_un;
1976 }
1977 if (to) {
1978 *to = msg_name;
1979 }
1980 msg->msg_name = tmp_un;
1981 msg->msg_namelen = sizeof(*tmp_un);
1982 }
1983
1984 if (si->bound == 0) {
1985 ret = swrap_auto_bind(si, si->family);
1986 if (ret == -1) return -1;
1987 }
1988
1989 if (!si->defer_connect) {
1990 break;
1991 }
1992
1993 ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
1994 tmp_un, 0, NULL);
1995 if (ret == -1) return -1;
1996
1997 ret = real_connect(si->fd, (struct sockaddr *)(void *)tmp_un,
1998 sizeof(*tmp_un));
1999
2000 /* to give better errors */
2001 if (ret == -1 && errno == ENOENT) {
2002 errno = EHOSTUNREACH;
2003 }
2004
2005 if (ret == -1) {
2006 return ret;
2007 }
2008
2009 si->defer_connect = 0;
2010 break;
2011 default:
2012 errno = EHOSTUNREACH;
2013 return -1;
2014 }
2015
2016 return 0;
2017 }
2018
2019 static void swrap_sendmsg_after(struct socket_info *si,
2020 struct msghdr *msg,
2021 const struct sockaddr *to,
2022 ssize_t ret)
2023 {
2024 int saved_errno = errno;
2025 size_t i, len = 0;
2026 uint8_t *buf;
2027 off_t ofs = 0;
2028 size_t avail = 0;
2029 size_t remain;
2030
2031 /* to give better errors */
2032 if (ret == -1 && saved_errno == ENOENT) {
2033 saved_errno = EHOSTUNREACH;
2034 }
2035
2036 for (i=0; i < msg->msg_iovlen; i++) {
2037 avail += msg->msg_iov[i].iov_len;
2038 }
2039
2040 if (ret == -1) {
2041 remain = MIN(80, avail);
2042 } else {
2043 remain = ret;
2044 }
2045
2046 /* we capture it as one single packet */
2047 buf = (uint8_t *)malloc(remain);
2048 if (!buf) {
2049 /* we just not capture the packet */
2050 errno = saved_errno;
2051 return;
2052 }
2053
2054 for (i=0; i < msg->msg_iovlen; i++) {
2055 size_t this_time = MIN(remain, msg->msg_iov[i].iov_len);
2056 memcpy(buf + ofs,
2057 msg->msg_iov[i].iov_base,
2058 this_time);
2059 ofs += this_time;
2060 remain -= this_time;
2061 }
2062 len = ofs;
2063
2064 switch (si->type) {
2065 case SOCK_STREAM:
2066 if (ret == -1) {
2067 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2068 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2069 } else {
2070 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2071 }
2072 break;
2073
2074 case SOCK_DGRAM:
2075 if (si->connected) {
2076 to = si->peername;
2077 }
2078 if (ret == -1) {
2079 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2080 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
2081 } else {
2082 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2083 }
2084 break;
2085 }
2086
2087 free(buf);
2088 errno = saved_errno;
2089 }
2090
2091 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
2092 {
2093 struct sockaddr_un un_addr;
2094 socklen_t un_addrlen = sizeof(un_addr);
2095 int ret;
2096 struct socket_info *si = find_socket_info(s);
2097 struct sockaddr_storage ss;
2098 socklen_t ss_len = sizeof(ss);
2099
2100 if (!si) {
2101 return real_recvfrom(s, buf, len, flags, from, fromlen);
2102 }
2103
2104 if (!from) {
2105 from = (struct sockaddr *)(void *)&ss;
2106 fromlen = &ss_len;
2107 }
2108
2109 if (si->type == SOCK_STREAM) {
2110 /* cut down to 1500 byte packets for stream sockets,
2111 * which makes it easier to format PCAP capture files
2112 * (as the caller will simply continue from here) */
2113 len = MIN(len, 1500);
2114 }
2115
2116 /* irix 6.4 forgets to null terminate the sun_path string :-( */
2117 memset(&un_addr, 0, sizeof(un_addr));
2118 ret = real_recvfrom(s, buf, len, flags,
2119 (struct sockaddr *)(void *)&un_addr, &un_addrlen);
2120 if (ret == -1)
2121 return ret;
2122
2123 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
2124 si->family, from, fromlen) == -1) {
2125 return -1;
2126 }
2127
2128 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
2129
2130 return ret;
2131 }
2132
2133
2134 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
2135 {
2136 struct msghdr msg;
2137 struct iovec tmp;
2138 struct sockaddr_un un_addr;
2139 const struct sockaddr_un *to_un = NULL;
2140 ssize_t ret;
2141 struct socket_info *si = find_socket_info(s);
2142 int bcast = 0;
2143
2144 if (!si) {
2145 return real_sendto(s, buf, len, flags, to, tolen);
2146 }
2147
2148 tmp.iov_base = discard_const_p(char, buf);
2149 tmp.iov_len = len;
2150
2151 ZERO_STRUCT(msg);
2152 msg.msg_name = discard_const_p(struct sockaddr, to); /* optional address */
2153 msg.msg_namelen = tolen; /* size of address */
2154 msg.msg_iov = &tmp; /* scatter/gather array */
2155 msg.msg_iovlen = 1; /* # elements in msg_iov */
2156 #if 0 /* not available on solaris */
2157 msg.msg_control = NULL; /* ancillary data, see below */
2158 msg.msg_controllen = 0; /* ancillary data buffer len */
2159 msg.msg_flags = 0; /* flags on received message */
2160 #endif
2161
2162 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
2163 if (ret == -1) return -1;
2164
2165 buf = msg.msg_iov[0].iov_base;
2166 len = msg.msg_iov[0].iov_len;
2167
2168 if (bcast) {
2169 struct stat st;
2170 unsigned int iface;
2171 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
2172 char type;
2173
2174 type = SOCKET_TYPE_CHAR_UDP;
2175
2176 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
2177 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
2178 socket_wrapper_dir(), type, iface, prt);
2179 if (stat(un_addr.sun_path, &st) != 0) continue;
2180
2181 /* ignore the any errors in broadcast sends */
2182 real_sendto(s, buf, len, flags,
2183 (struct sockaddr *)(void *)&un_addr,
2184 sizeof(un_addr));
2185 }
2186
2187 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2188
2189 return len;
2190 }
2191
2192 ret = real_sendto(s, buf, len, flags, msg.msg_name, msg.msg_namelen);
2193
2194 swrap_sendmsg_after(si, &msg, to, ret);
2195
2196 return ret;
2197 }
2198
2199 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
2200 {
2201 int ret;
2202 struct socket_info *si = find_socket_info(s);
2203
2204 if (!si) {
2205 return real_recv(s, buf, len, flags);
2206 }
2207
2208 if (si->type == SOCK_STREAM) {
2209 /* cut down to 1500 byte packets for stream sockets,
2210 * which makes it easier to format PCAP capture files
2211 * (as the caller will simply continue from here) */
2212 len = MIN(len, 1500);
2213 }
2214
2215 ret = real_recv(s, buf, len, flags);
2216 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2217 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2218 } else if (ret == 0) { /* END OF FILE */
2219 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2220 } else if (ret > 0) {
2221 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2222 }
2223
2224 return ret;
2225 }
2226
2227 _PUBLIC_ ssize_t swrap_read(int s, void *buf, size_t len)
2228 {
2229 int ret;
2230 struct socket_info *si = find_socket_info(s);
2231
2232 if (!si) {
2233 return real_read(s, buf, len);
2234 }
2235
2236 if (si->type == SOCK_STREAM) {
2237 /* cut down to 1500 byte packets for stream sockets,
2238 * which makes it easier to format PCAP capture files
2239 * (as the caller will simply continue from here) */
2240 len = MIN(len, 1500);
2241 }
2242
2243 ret = real_read(s, buf, len);
2244 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2245 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2246 } else if (ret == 0) { /* END OF FILE */
2247 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2248 } else if (ret > 0) {
2249 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2250 }
2251
2252 return ret;
2253 }
2254
2255
2256 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
2257 {
2258 struct msghdr msg;
2259 struct iovec tmp;
2260 struct sockaddr_un un_addr;
2261 ssize_t ret;
2262 struct socket_info *si = find_socket_info(s);
2263
2264 if (!si) {
2265 return real_send(s, buf, len, flags);
2266 }
2267
2268 tmp.iov_base = discard_const_p(char, buf);
2269 tmp.iov_len = len;
2270
2271 ZERO_STRUCT(msg);
2272 msg.msg_name = NULL; /* optional address */
2273 msg.msg_namelen = 0; /* size of address */
2274 msg.msg_iov = &tmp; /* scatter/gather array */
2275 msg.msg_iovlen = 1; /* # elements in msg_iov */
2276 #if 0 /* not available on solaris */
2277 msg.msg_control = NULL; /* ancillary data, see below */
2278 msg.msg_controllen = 0; /* ancillary data buffer len */
2279 msg.msg_flags = 0; /* flags on received message */
2280 #endif
2281
2282 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
2283 if (ret == -1) return -1;
2284
2285 buf = msg.msg_iov[0].iov_base;
2286 len = msg.msg_iov[0].iov_len;
2287
2288 ret = real_send(s, buf, len, flags);
2289
2290 swrap_sendmsg_after(si, &msg, NULL, ret);
2291
2292 return ret;
2293 }
2294
2295 _PUBLIC_ ssize_t swrap_sendmsg(int s, const struct msghdr *omsg, int flags)
2296 {
2297 struct msghdr msg;
2298 struct iovec tmp;
2299 struct sockaddr_un un_addr;
2300 const struct sockaddr_un *to_un = NULL;
2301 const struct sockaddr *to = NULL;
2302 ssize_t ret;
2303 struct socket_info *si = find_socket_info(s);
2304 int bcast = 0;
2305
2306 if (!si) {
2307 return real_sendmsg(s, omsg, flags);
2308 }
2309
2310 tmp.iov_base = NULL;
2311 tmp.iov_len = 0;
2312
2313 msg = *omsg;
2314 #if 0
2315 msg.msg_name = omsg->msg_name; /* optional address */
2316 msg.msg_namelen = omsg->msg_namelen; /* size of address */
2317 msg.msg_iov = omsg->msg_iov; /* scatter/gather array */
2318 msg.msg_iovlen = omsg->msg_iovlen; /* # elements in msg_iov */
2319 /* the following is not available on solaris */
2320 msg.msg_control = omsg->msg_control; /* ancillary data, see below */
2321 msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */
2322 msg.msg_flags = omsg->msg_flags; /* flags on received message */
2323 #endif
2324
2325 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
2326 if (ret == -1) return -1;
2327
2328 if (bcast) {
2329 struct stat st;
2330 unsigned int iface;
2331 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
2332 char type;
2333 size_t i, len = 0;
2334 uint8_t *buf;
2335 off_t ofs = 0;
2336 size_t avail = 0;
2337 size_t remain;
2338
2339 for (i=0; i < msg.msg_iovlen; i++) {
2340 avail += msg.msg_iov[i].iov_len;
2341 }
2342
2343 len = avail;
2344 remain = avail;
2345
2346 /* we capture it as one single packet */
2347 buf = (uint8_t *)malloc(remain);
2348 if (!buf) {
2349 return -1;
2350 }
2351
2352 for (i=0; i < msg.msg_iovlen; i++) {
2353 size_t this_time = MIN(remain, msg.msg_iov[i].iov_len);
2354 memcpy(buf + ofs,
2355 msg.msg_iov[i].iov_base,
2356 this_time);
2357 ofs += this_time;
2358 remain -= this_time;
2359 }
2360
2361 type = SOCKET_TYPE_CHAR_UDP;
2362
2363 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
2364 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
2365 socket_wrapper_dir(), type, iface, prt);
2366 if (stat(un_addr.sun_path, &st) != 0) continue;
2367
2368 msg.msg_name = &un_addr; /* optional address */
2369 msg.msg_namelen = sizeof(un_addr); /* size of address */
2370
2371 /* ignore the any errors in broadcast sends */
2372 real_sendmsg(s, &msg, flags);
2373 }
2374
2375 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2376 free(buf);
2377
2378 return len;
2379 }
2380
2381 ret = real_sendmsg(s, &msg, flags);
2382
2383 swrap_sendmsg_after(si, &msg, to, ret);
2384
2385 return ret;
2386 }
2387
2388 int swrap_readv(int s, const struct iovec *vector, size_t count)
2389 {
2390 int ret;
2391 struct socket_info *si = find_socket_info(s);
2392 struct iovec v;
2393
2394 if (!si) {
2395 return real_readv(s, vector, count);
2396 }
2397
2398 if (!si->connected) {
2399 errno = ENOTCONN;
2400 return -1;
2401 }
2402
2403 if (si->type == SOCK_STREAM && count > 0) {
2404 /* cut down to 1500 byte packets for stream sockets,
2405 * which makes it easier to format PCAP capture files
2406 * (as the caller will simply continue from here) */
2407 size_t i, len = 0;
2408
2409 for (i=0; i < count; i++) {
2410 size_t nlen;
2411 nlen = len + vector[i].iov_len;
2412 if (nlen > 1500) {
2413 break;
2414 }
2415 }
2416 count = i;
2417 if (count == 0) {
2418 v = vector[0];
2419 v.iov_len = MIN(v.iov_len, 1500);
2420 vector = &v;
2421 count = 1;
2422 }
2423 }
2424
2425 ret = real_readv(s, vector, count);
2426 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2427 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2428 } else if (ret == 0) { /* END OF FILE */
2429 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2430 } else if (ret > 0) {
2431 uint8_t *buf;
2432 off_t ofs = 0;
2433 size_t i;
2434 size_t remain = ret;
2435
2436 /* we capture it as one single packet */
2437 buf = (uint8_t *)malloc(ret);
2438 if (!buf) {
2439 /* we just not capture the packet */
2440 errno = 0;
2441 return ret;
2442 }
2443
2444 for (i=0; i < count; i++) {
2445 size_t this_time = MIN(remain, vector[i].iov_len);
2446 memcpy(buf + ofs,
2447 vector[i].iov_base,
2448 this_time);
2449 ofs += this_time;
2450 remain -= this_time;
2451 }
2452
2453 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2454 free(buf);
2455 }
2456
2457 return ret;
2458 }
2459
2460 int swrap_writev(int s, const struct iovec *vector, size_t count)
2461 {
2462 struct msghdr msg;
2463 struct iovec tmp;
2464 struct sockaddr_un un_addr;
2465 ssize_t ret;
2466 struct socket_info *si = find_socket_info(s);
2467
2468 if (!si) {
2469 return real_writev(s, vector, count);
2470 }
2471
2472 tmp.iov_base = NULL;
2473 tmp.iov_len = 0;
2474
2475 ZERO_STRUCT(msg);
2476 msg.msg_name = NULL; /* optional address */
2477 msg.msg_namelen = 0; /* size of address */
2478 msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */
2479 msg.msg_iovlen = count; /* # elements in msg_iov */
2480 #if 0 /* not available on solaris */
2481 msg.msg_control = NULL; /* ancillary data, see below */
2482 msg.msg_controllen = 0; /* ancillary data buffer len */
2483 msg.msg_flags = 0; /* flags on received message */
2484 #endif
2485
2486 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
2487 if (ret == -1) return -1;
2488
2489 ret = real_writev(s, msg.msg_iov, msg.msg_iovlen);
2490
2491 swrap_sendmsg_after(si, &msg, NULL, ret);
2492
2493 return ret;
2494 }
2495
2496 _PUBLIC_ int swrap_close(int fd)
2497 {
2498 struct socket_info *si = find_socket_info(fd);
2499 int ret;
2500
2501 if (!si) {
2502 return real_close(fd);
2503 }
2504
2505 SWRAP_DLIST_REMOVE(sockets, si);
2506
2507 if (si->myname && si->peername) {
2508 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
2509 }
2510
2511 ret = real_close(fd);
2512
2513 if (si->myname && si->peername) {
2514 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
2515 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
2516 }
2517
2518 if (si->path) free(si->path);
2519 if (si->myname) free(si->myname);
2520 if (si->peername) free(si->peername);
2521 if (si->tmp_path) {
2522 unlink(si->tmp_path);
2523 free(si->tmp_path);
2524 }
2525 free(si);
2526
2527 return ret;
2528 }
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