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s3-spoolss: Fix Bug #6568: _spoolss_GetPrintProcessorDirectory() implementation.
[Samba.git] / lib / socket_wrapper / socket_wrapper.c
blobcdfdceef216da1ace192ccabb08763adb0adb8fd
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_ioctl ioctl
122 #define real_recv recv
123 #define real_send send
124 #define real_readv readv
125 #define real_writev writev
126 #define real_socket socket
127 #define real_close close
128 #endif
129
130 #ifdef HAVE_GETTIMEOFDAY_TZ
131 #define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
132 #else
133 #define swrapGetTimeOfDay(tval) gettimeofday(tval)
134 #endif
135
136 /* we need to use a very terse format here as IRIX 6.4 silently
137 truncates names to 16 chars, so if we use a longer name then we
138 can't tell which port a packet came from with recvfrom()
139
140 with this format we have 8 chars left for the directory name
141 */
142 #define SOCKET_FORMAT "%c%02X%04X"
143 #define SOCKET_TYPE_CHAR_TCP 'T'
144 #define SOCKET_TYPE_CHAR_UDP 'U'
145 #define SOCKET_TYPE_CHAR_TCP_V6 'X'
146 #define SOCKET_TYPE_CHAR_UDP_V6 'Y'
147
148 #define MAX_WRAPPED_INTERFACES 16
149
150 #ifdef HAVE_IPV6
151 /*
152 * FD00::5357:5FXX
153 */
154 static const struct in6_addr *swrap_ipv6(void)
155 {
156 static struct in6_addr v;
157 static int initialized;
158 int ret;
159
160 if (initialized) {
161 return &v;
162 }
163 initialized = 1;
164
165 ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
166 if (ret <= 0) {
167 abort();
168 }
169
170 return &v;
171 }
172 #endif
173
174 static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
175 {
176 struct sockaddr *ret = (struct sockaddr *)malloc(len);
177 memcpy(ret, data, len);
178 return ret;
179 }
180
181 static void set_port(int family, int prt, struct sockaddr *addr)
182 {
183 switch (family) {
184 case AF_INET:
185 ((struct sockaddr_in *)addr)->sin_port = htons(prt);
186 break;
187 #ifdef HAVE_IPV6
188 case AF_INET6:
189 ((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
190 break;
191 #endif
192 }
193 }
194
195 static size_t socket_length(int family)
196 {
197 switch (family) {
198 case AF_INET:
199 return sizeof(struct sockaddr_in);
200 #ifdef HAVE_IPV6
201 case AF_INET6:
202 return sizeof(struct sockaddr_in6);
203 #endif
204 }
205 return 0;
206 }
207
208
209
210 struct socket_info
211 {
212 int fd;
213
214 int family;
215 int type;
216 int protocol;
217 int bound;
218 int bcast;
219 int is_server;
220 int connected;
221
222 char *path;
223 char *tmp_path;
224
225 struct sockaddr *myname;
226 socklen_t myname_len;
227
228 struct sockaddr *peername;
229 socklen_t peername_len;
230
231 struct {
232 unsigned long pck_snd;
233 unsigned long pck_rcv;
234 } io;
235
236 struct socket_info *prev, *next;
237 };
238
239 static struct socket_info *sockets;
240
241 const char *socket_wrapper_dir(void)
242 {
243 const char *s = getenv("SOCKET_WRAPPER_DIR");
244 if (s == NULL) {
245 return NULL;
246 }
247 if (strncmp(s, "./", 2) == 0) {
248 s += 2;
249 }
250 return s;
251 }
252
253 unsigned int socket_wrapper_default_iface(void)
254 {
255 const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
256 if (s) {
257 unsigned int iface;
258 if (sscanf(s, "%u", &iface) == 1) {
259 if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
260 return iface;
261 }
262 }
263 }
264
265 return 1;/* 127.0.0.1 */
266 }
267
268 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
269 {
270 unsigned int iface;
271 unsigned int prt;
272 const char *p;
273 char type;
274
275 p = strrchr(un->sun_path, '/');
276 if (p) p++; else p = un->sun_path;
277
278 if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
279 errno = EINVAL;
280 return -1;
281 }
282
283 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
284 errno = EINVAL;
285 return -1;
286 }
287
288 if (prt > 0xFFFF) {
289 errno = EINVAL;
290 return -1;
291 }
292
293 switch(type) {
294 case SOCKET_TYPE_CHAR_TCP:
295 case SOCKET_TYPE_CHAR_UDP: {
296 struct sockaddr_in *in2 = (struct sockaddr_in *)in;
297
298 if ((*len) < sizeof(*in2)) {
299 errno = EINVAL;
300 return -1;
301 }
302
303 memset(in2, 0, sizeof(*in2));
304 in2->sin_family = AF_INET;
305 in2->sin_addr.s_addr = htonl((127<<24) | iface);
306 in2->sin_port = htons(prt);
307
308 *len = sizeof(*in2);
309 break;
310 }
311 #ifdef HAVE_IPV6
312 case SOCKET_TYPE_CHAR_TCP_V6:
313 case SOCKET_TYPE_CHAR_UDP_V6: {
314 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)in;
315
316 if ((*len) < sizeof(*in2)) {
317 errno = EINVAL;
318 return -1;
319 }
320
321 memset(in2, 0, sizeof(*in2));
322 in2->sin6_family = AF_INET6;
323 in2->sin6_addr = *swrap_ipv6();
324 in2->sin6_addr.s6_addr[15] = iface;
325 in2->sin6_port = htons(prt);
326
327 *len = sizeof(*in2);
328 break;
329 }
330 #endif
331 default:
332 errno = EINVAL;
333 return -1;
334 }
335
336 return 0;
337 }
338
339 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
340 int *bcast)
341 {
342 char type = '\0';
343 unsigned int prt;
344 unsigned int iface;
345 int is_bcast = 0;
346
347 if (bcast) *bcast = 0;
348
349 switch (si->family) {
350 case AF_INET: {
351 const struct sockaddr_in *in =
352 (const struct sockaddr_in *)inaddr;
353 unsigned int addr = ntohl(in->sin_addr.s_addr);
354 char u_type = '\0';
355 char b_type = '\0';
356 char a_type = '\0';
357
358 switch (si->type) {
359 case SOCK_STREAM:
360 u_type = SOCKET_TYPE_CHAR_TCP;
361 break;
362 case SOCK_DGRAM:
363 u_type = SOCKET_TYPE_CHAR_UDP;
364 a_type = SOCKET_TYPE_CHAR_UDP;
365 b_type = SOCKET_TYPE_CHAR_UDP;
366 break;
367 }
368
369 prt = ntohs(in->sin_port);
370 if (a_type && addr == 0xFFFFFFFF) {
371 /* 255.255.255.255 only udp */
372 is_bcast = 2;
373 type = a_type;
374 iface = socket_wrapper_default_iface();
375 } else if (b_type && addr == 0x7FFFFFFF) {
376 /* 127.255.255.255 only udp */
377 is_bcast = 1;
378 type = b_type;
379 iface = socket_wrapper_default_iface();
380 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
381 /* 127.0.0.X */
382 is_bcast = 0;
383 type = u_type;
384 iface = (addr & 0x000000FF);
385 } else {
386 errno = ENETUNREACH;
387 return -1;
388 }
389 if (bcast) *bcast = is_bcast;
390 break;
391 }
392 #ifdef HAVE_IPV6
393 case AF_INET6: {
394 const struct sockaddr_in6 *in =
395 (const struct sockaddr_in6 *)inaddr;
396 struct in6_addr cmp;
397
398 switch (si->type) {
399 case SOCK_STREAM:
400 type = SOCKET_TYPE_CHAR_TCP_V6;
401 break;
402 case SOCK_DGRAM:
403 type = SOCKET_TYPE_CHAR_UDP_V6;
404 break;
405 }
406
407 /* XXX no multicast/broadcast */
408
409 prt = ntohs(in->sin6_port);
410
411 cmp = in->sin6_addr;
412 cmp.s6_addr[15] = 0;
413 if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
414 iface = in->sin6_addr.s6_addr[15];
415 } else {
416 errno = ENETUNREACH;
417 return -1;
418 }
419
420 break;
421 }
422 #endif
423 default:
424 errno = ENETUNREACH;
425 return -1;
426 }
427
428 if (prt == 0) {
429 errno = EINVAL;
430 return -1;
431 }
432
433 if (is_bcast) {
434 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
435 socket_wrapper_dir());
436 /* the caller need to do more processing */
437 return 0;
438 }
439
440 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
441 socket_wrapper_dir(), type, iface, prt);
442
443 return 0;
444 }
445
446 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
447 int *bcast)
448 {
449 char type = '\0';
450 unsigned int prt;
451 unsigned int iface;
452 struct stat st;
453 int is_bcast = 0;
454
455 if (bcast) *bcast = 0;
456
457 switch (si->family) {
458 case AF_INET: {
459 const struct sockaddr_in *in =
460 (const struct sockaddr_in *)inaddr;
461 unsigned int addr = ntohl(in->sin_addr.s_addr);
462 char u_type = '\0';
463 char d_type = '\0';
464 char b_type = '\0';
465 char a_type = '\0';
466
467 prt = ntohs(in->sin_port);
468
469 switch (si->type) {
470 case SOCK_STREAM:
471 u_type = SOCKET_TYPE_CHAR_TCP;
472 d_type = SOCKET_TYPE_CHAR_TCP;
473 break;
474 case SOCK_DGRAM:
475 u_type = SOCKET_TYPE_CHAR_UDP;
476 d_type = SOCKET_TYPE_CHAR_UDP;
477 a_type = SOCKET_TYPE_CHAR_UDP;
478 b_type = SOCKET_TYPE_CHAR_UDP;
479 break;
480 }
481
482 if (addr == 0) {
483 /* 0.0.0.0 */
484 is_bcast = 0;
485 type = d_type;
486 iface = socket_wrapper_default_iface();
487 } else if (a_type && addr == 0xFFFFFFFF) {
488 /* 255.255.255.255 only udp */
489 is_bcast = 2;
490 type = a_type;
491 iface = socket_wrapper_default_iface();
492 } else if (b_type && addr == 0x7FFFFFFF) {
493 /* 127.255.255.255 only udp */
494 is_bcast = 1;
495 type = b_type;
496 iface = socket_wrapper_default_iface();
497 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
498 /* 127.0.0.X */
499 is_bcast = 0;
500 type = u_type;
501 iface = (addr & 0x000000FF);
502 } else {
503 errno = EADDRNOTAVAIL;
504 return -1;
505 }
506 break;
507 }
508 #ifdef HAVE_IPV6
509 case AF_INET6: {
510 const struct sockaddr_in6 *in =
511 (const struct sockaddr_in6 *)inaddr;
512 struct in6_addr cmp;
513
514 switch (si->type) {
515 case SOCK_STREAM:
516 type = SOCKET_TYPE_CHAR_TCP_V6;
517 break;
518 case SOCK_DGRAM:
519 type = SOCKET_TYPE_CHAR_UDP_V6;
520 break;
521 }
522
523 /* XXX no multicast/broadcast */
524
525 prt = ntohs(in->sin6_port);
526
527 cmp = in->sin6_addr;
528 cmp.s6_addr[15] = 0;
529 if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
530 iface = socket_wrapper_default_iface();
531 } else if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
532 iface = in->sin6_addr.s6_addr[15];
533 } else {
534 errno = EADDRNOTAVAIL;
535 return -1;
536 }
537
538 break;
539 }
540 #endif
541 default:
542 errno = EADDRNOTAVAIL;
543 return -1;
544 }
545
546
547 if (bcast) *bcast = is_bcast;
548
549 if (prt == 0) {
550 /* handle auto-allocation of ephemeral ports */
551 for (prt = 5001; prt < 10000; prt++) {
552 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
553 socket_wrapper_dir(), type, iface, prt);
554 if (stat(un->sun_path, &st) == 0) continue;
555
556 set_port(si->family, prt, si->myname);
557 break;
558 }
559 if (prt == 10000) {
560 errno = ENFILE;
561 return -1;
562 }
563 }
564
565 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
566 socket_wrapper_dir(), type, iface, prt);
567 return 0;
568 }
569
570 static struct socket_info *find_socket_info(int fd)
571 {
572 struct socket_info *i;
573 for (i = sockets; i; i = i->next) {
574 if (i->fd == fd)
575 return i;
576 }
577
578 return NULL;
579 }
580
581 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
582 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
583 {
584 if (!out_addr)
585 return 0;
586
587 out_addr->sun_family = AF_UNIX;
588
589 switch (in_addr->sa_family) {
590 case AF_INET:
591 #ifdef HAVE_IPV6
592 case AF_INET6:
593 #endif
594 switch (si->type) {
595 case SOCK_STREAM:
596 case SOCK_DGRAM:
597 break;
598 default:
599 errno = ESOCKTNOSUPPORT;
600 return -1;
601 }
602 if (alloc_sock) {
603 return convert_in_un_alloc(si, in_addr, out_addr, bcast);
604 } else {
605 return convert_in_un_remote(si, in_addr, out_addr, bcast);
606 }
607 default:
608 break;
609 }
610
611 errno = EAFNOSUPPORT;
612 return -1;
613 }
614
615 static int sockaddr_convert_from_un(const struct socket_info *si,
616 const struct sockaddr_un *in_addr,
617 socklen_t un_addrlen,
618 int family,
619 struct sockaddr *out_addr,
620 socklen_t *out_addrlen)
621 {
622 if (out_addr == NULL || out_addrlen == NULL)
623 return 0;
624
625 if (un_addrlen == 0) {
626 *out_addrlen = 0;
627 return 0;
628 }
629
630 switch (family) {
631 case AF_INET:
632 #ifdef HAVE_IPV6
633 case AF_INET6:
634 #endif
635 switch (si->type) {
636 case SOCK_STREAM:
637 case SOCK_DGRAM:
638 break;
639 default:
640 errno = ESOCKTNOSUPPORT;
641 return -1;
642 }
643 return convert_un_in(in_addr, out_addr, out_addrlen);
644 default:
645 break;
646 }
647
648 errno = EAFNOSUPPORT;
649 return -1;
650 }
651
652 enum swrap_packet_type {
653 SWRAP_CONNECT_SEND,
654 SWRAP_CONNECT_UNREACH,
655 SWRAP_CONNECT_RECV,
656 SWRAP_CONNECT_ACK,
657 SWRAP_ACCEPT_SEND,
658 SWRAP_ACCEPT_RECV,
659 SWRAP_ACCEPT_ACK,
660 SWRAP_RECVFROM,
661 SWRAP_SENDTO,
662 SWRAP_SENDTO_UNREACH,
663 SWRAP_PENDING_RST,
664 SWRAP_RECV,
665 SWRAP_RECV_RST,
666 SWRAP_SEND,
667 SWRAP_SEND_RST,
668 SWRAP_CLOSE_SEND,
669 SWRAP_CLOSE_RECV,
670 SWRAP_CLOSE_ACK
671 };
672
673 struct swrap_file_hdr {
674 uint32_t magic;
675 uint16_t version_major;
676 uint16_t version_minor;
677 int32_t timezone;
678 uint32_t sigfigs;
679 uint32_t frame_max_len;
680 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
681 uint32_t link_type;
682 };
683 #define SWRAP_FILE_HDR_SIZE 24
684
685 struct swrap_packet_frame {
686 uint32_t seconds;
687 uint32_t micro_seconds;
688 uint32_t recorded_length;
689 uint32_t full_length;
690 };
691 #define SWRAP_PACKET_FRAME_SIZE 16
692
693 union swrap_packet_ip {
694 struct {
695 uint8_t ver_hdrlen;
696 uint8_t tos;
697 uint16_t packet_length;
698 uint16_t identification;
699 uint8_t flags;
700 uint8_t fragment;
701 uint8_t ttl;
702 uint8_t protocol;
703 uint16_t hdr_checksum;
704 uint32_t src_addr;
705 uint32_t dest_addr;
706 } v4;
707 #define SWRAP_PACKET_IP_V4_SIZE 20
708 struct {
709 uint8_t ver_prio;
710 uint8_t flow_label_high;
711 uint16_t flow_label_low;
712 uint16_t payload_length;
713 uint8_t next_header;
714 uint8_t hop_limit;
715 uint8_t src_addr[16];
716 uint8_t dest_addr[16];
717 } v6;
718 #define SWRAP_PACKET_IP_V6_SIZE 40
719 };
720 #define SWRAP_PACKET_IP_SIZE 40
721
722 union swrap_packet_payload {
723 struct {
724 uint16_t source_port;
725 uint16_t dest_port;
726 uint32_t seq_num;
727 uint32_t ack_num;
728 uint8_t hdr_length;
729 uint8_t control;
730 uint16_t window;
731 uint16_t checksum;
732 uint16_t urg;
733 } tcp;
734 #define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
735 struct {
736 uint16_t source_port;
737 uint16_t dest_port;
738 uint16_t length;
739 uint16_t checksum;
740 } udp;
741 #define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
742 struct {
743 uint8_t type;
744 uint8_t code;
745 uint16_t checksum;
746 uint32_t unused;
747 } icmp4;
748 #define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
749 struct {
750 uint8_t type;
751 uint8_t code;
752 uint16_t checksum;
753 uint32_t unused;
754 } icmp6;
755 #define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
756 };
757 #define SWRAP_PACKET_PAYLOAD_SIZE 20
758
759 #define SWRAP_PACKET_MIN_ALLOC \
760 (SWRAP_PACKET_FRAME_SIZE + \
761 SWRAP_PACKET_IP_SIZE + \
762 SWRAP_PACKET_PAYLOAD_SIZE)
763
764 static const char *socket_wrapper_pcap_file(void)
765 {
766 static int initialized = 0;
767 static const char *s = NULL;
768 static const struct swrap_file_hdr h;
769 static const struct swrap_packet_frame f;
770 static const union swrap_packet_ip i;
771 static const union swrap_packet_payload p;
772
773 if (initialized == 1) {
774 return s;
775 }
776 initialized = 1;
777
778 /*
779 * TODO: don't use the structs use plain buffer offsets
780 * and PUSH_U8(), PUSH_U16() and PUSH_U32()
781 *
782 * for now make sure we disable PCAP support
783 * if the struct has alignment!
784 */
785 if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
786 return NULL;
787 }
788 if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
789 return NULL;
790 }
791 if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
792 return NULL;
793 }
794 if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
795 return NULL;
796 }
797 if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
798 return NULL;
799 }
800 if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
801 return NULL;
802 }
803 if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
804 return NULL;
805 }
806 if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
807 return NULL;
808 }
809 if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
810 return NULL;
811 }
812 if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
813 return NULL;
814 }
815
816 s = getenv("SOCKET_WRAPPER_PCAP_FILE");
817 if (s == NULL) {
818 return NULL;
819 }
820 if (strncmp(s, "./", 2) == 0) {
821 s += 2;
822 }
823 return s;
824 }
825
826 static uint8_t *swrap_packet_init(struct timeval *tval,
827 const struct sockaddr *src,
828 const struct sockaddr *dest,
829 int socket_type,
830 const uint8_t *payload,
831 size_t payload_len,
832 unsigned long tcp_seqno,
833 unsigned long tcp_ack,
834 unsigned char tcp_ctl,
835 int unreachable,
836 size_t *_packet_len)
837 {
838 uint8_t *base;
839 uint8_t *buf;
840 struct swrap_packet_frame *frame;
841 union swrap_packet_ip *ip;
842 union swrap_packet_payload *pay;
843 size_t packet_len;
844 size_t alloc_len;
845 size_t nonwire_len = sizeof(*frame);
846 size_t wire_hdr_len = 0;
847 size_t wire_len = 0;
848 size_t ip_hdr_len = 0;
849 size_t icmp_hdr_len = 0;
850 size_t icmp_truncate_len = 0;
851 uint8_t protocol = 0, icmp_protocol = 0;
852 const struct sockaddr_in *src_in = NULL;
853 const struct sockaddr_in *dest_in = NULL;
854 #ifdef HAVE_IPV6
855 const struct sockaddr_in6 *src_in6 = NULL;
856 const struct sockaddr_in6 *dest_in6 = NULL;
857 #endif
858 uint16_t src_port;
859 uint16_t dest_port;
860
861 switch (src->sa_family) {
862 case AF_INET:
863 src_in = (const struct sockaddr_in *)src;
864 dest_in = (const struct sockaddr_in *)dest;
865 src_port = src_in->sin_port;
866 dest_port = dest_in->sin_port;
867 ip_hdr_len = sizeof(ip->v4);
868 break;
869 #ifdef HAVE_IPV6
870 case AF_INET6:
871 src_in6 = (const struct sockaddr_in6 *)src;
872 dest_in6 = (const struct sockaddr_in6 *)dest;
873 src_port = src_in6->sin6_port;
874 dest_port = dest_in6->sin6_port;
875 ip_hdr_len = sizeof(ip->v6);
876 break;
877 #endif
878 default:
879 return NULL;
880 }
881
882 switch (socket_type) {
883 case SOCK_STREAM:
884 protocol = 0x06; /* TCP */
885 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
886 wire_len = wire_hdr_len + payload_len;
887 break;
888
889 case SOCK_DGRAM:
890 protocol = 0x11; /* UDP */
891 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
892 wire_len = wire_hdr_len + payload_len;
893 break;
894
895 default:
896 return NULL;
897 }
898
899 if (unreachable) {
900 icmp_protocol = protocol;
901 switch (src->sa_family) {
902 case AF_INET:
903 protocol = 0x01; /* ICMPv4 */
904 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
905 break;
906 #ifdef HAVE_IPV6
907 case AF_INET6:
908 protocol = 0x3A; /* ICMPv6 */
909 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
910 break;
911 #endif
912 }
913 if (wire_len > 64 ) {
914 icmp_truncate_len = wire_len - 64;
915 }
916 wire_hdr_len += icmp_hdr_len;
917 wire_len += icmp_hdr_len;
918 }
919
920 packet_len = nonwire_len + wire_len;
921 alloc_len = packet_len;
922 if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
923 alloc_len = SWRAP_PACKET_MIN_ALLOC;
924 }
925
926 base = (uint8_t *)malloc(alloc_len);
927 if (!base) return NULL;
928
929 buf = base;
930
931 frame = (struct swrap_packet_frame *)buf;
932 frame->seconds = tval->tv_sec;
933 frame->micro_seconds = tval->tv_usec;
934 frame->recorded_length = wire_len - icmp_truncate_len;
935 frame->full_length = wire_len - icmp_truncate_len;
936 buf += SWRAP_PACKET_FRAME_SIZE;
937
938 ip = (union swrap_packet_ip *)buf;
939 switch (src->sa_family) {
940 case AF_INET:
941 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
942 ip->v4.tos = 0x00;
943 ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
944 ip->v4.identification = htons(0xFFFF);
945 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
946 ip->v4.fragment = htons(0x0000);
947 ip->v4.ttl = 0xFF;
948 ip->v4.protocol = protocol;
949 ip->v4.hdr_checksum = htons(0x0000);
950 ip->v4.src_addr = src_in->sin_addr.s_addr;
951 ip->v4.dest_addr = dest_in->sin_addr.s_addr;
952 buf += SWRAP_PACKET_IP_V4_SIZE;
953 break;
954 #ifdef HAVE_IPV6
955 case AF_INET6:
956 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
957 ip->v6.flow_label_high = 0x00;
958 ip->v6.flow_label_low = 0x0000;
959 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
960 ip->v6.next_header = protocol;
961 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
962 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
963 buf += SWRAP_PACKET_IP_V6_SIZE;
964 break;
965 #endif
966 }
967
968 if (unreachable) {
969 pay = (union swrap_packet_payload *)buf;
970 switch (src->sa_family) {
971 case AF_INET:
972 pay->icmp4.type = 0x03; /* destination unreachable */
973 pay->icmp4.code = 0x01; /* host unreachable */
974 pay->icmp4.checksum = htons(0x0000);
975 pay->icmp4.unused = htonl(0x00000000);
976 buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
977
978 /* set the ip header in the ICMP payload */
979 ip = (union swrap_packet_ip *)buf;
980 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
981 ip->v4.tos = 0x00;
982 ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
983 ip->v4.identification = htons(0xFFFF);
984 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
985 ip->v4.fragment = htons(0x0000);
986 ip->v4.ttl = 0xFF;
987 ip->v4.protocol = icmp_protocol;
988 ip->v4.hdr_checksum = htons(0x0000);
989 ip->v4.src_addr = dest_in->sin_addr.s_addr;
990 ip->v4.dest_addr = src_in->sin_addr.s_addr;
991 buf += SWRAP_PACKET_IP_V4_SIZE;
992
993 src_port = dest_in->sin_port;
994 dest_port = src_in->sin_port;
995 break;
996 #ifdef HAVE_IPV6
997 case AF_INET6:
998 pay->icmp6.type = 0x01; /* destination unreachable */
999 pay->icmp6.code = 0x03; /* address unreachable */
1000 pay->icmp6.checksum = htons(0x0000);
1001 pay->icmp6.unused = htonl(0x00000000);
1002 buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
1003
1004 /* set the ip header in the ICMP payload */
1005 ip = (union swrap_packet_ip *)buf;
1006 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
1007 ip->v6.flow_label_high = 0x00;
1008 ip->v6.flow_label_low = 0x0000;
1009 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
1010 ip->v6.next_header = protocol;
1011 memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
1012 memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
1013 buf += SWRAP_PACKET_IP_V6_SIZE;
1014
1015 src_port = dest_in6->sin6_port;
1016 dest_port = src_in6->sin6_port;
1017 break;
1018 #endif
1019 }
1020 }
1021
1022 pay = (union swrap_packet_payload *)buf;
1023
1024 switch (socket_type) {
1025 case SOCK_STREAM:
1026 pay->tcp.source_port = src_port;
1027 pay->tcp.dest_port = dest_port;
1028 pay->tcp.seq_num = htonl(tcp_seqno);
1029 pay->tcp.ack_num = htonl(tcp_ack);
1030 pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
1031 pay->tcp.control = tcp_ctl;
1032 pay->tcp.window = htons(0x7FFF);
1033 pay->tcp.checksum = htons(0x0000);
1034 pay->tcp.urg = htons(0x0000);
1035 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
1036
1037 break;
1038
1039 case SOCK_DGRAM:
1040 pay->udp.source_port = src_port;
1041 pay->udp.dest_port = dest_port;
1042 pay->udp.length = htons(8 + payload_len);
1043 pay->udp.checksum = htons(0x0000);
1044 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
1045
1046 break;
1047 }
1048
1049 if (payload && payload_len > 0) {
1050 memcpy(buf, payload, payload_len);
1051 }
1052
1053 *_packet_len = packet_len - icmp_truncate_len;
1054 return base;
1055 }
1056
1057 static int swrap_get_pcap_fd(const char *fname)
1058 {
1059 static int fd = -1;
1060
1061 if (fd != -1) return fd;
1062
1063 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1064 if (fd != -1) {
1065 struct swrap_file_hdr file_hdr;
1066 file_hdr.magic = 0xA1B2C3D4;
1067 file_hdr.version_major = 0x0002;
1068 file_hdr.version_minor = 0x0004;
1069 file_hdr.timezone = 0x00000000;
1070 file_hdr.sigfigs = 0x00000000;
1071 file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
1072 file_hdr.link_type = 0x0065; /* 101 RAW IP */
1073
1074 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1075 close(fd);
1076 fd = -1;
1077 }
1078 return fd;
1079 }
1080
1081 fd = open(fname, O_WRONLY|O_APPEND, 0644);
1082
1083 return fd;
1084 }
1085
1086 static uint8_t *swrap_marshall_packet(struct socket_info *si,
1087 const struct sockaddr *addr,
1088 enum swrap_packet_type type,
1089 const void *buf, size_t len,
1090 size_t *packet_len)
1091 {
1092 const struct sockaddr *src_addr;
1093 const struct sockaddr *dest_addr;
1094 unsigned long tcp_seqno = 0;
1095 unsigned long tcp_ack = 0;
1096 unsigned char tcp_ctl = 0;
1097 int unreachable = 0;
1098
1099 struct timeval tv;
1100
1101 switch (si->family) {
1102 case AF_INET:
1103 break;
1104 #ifdef HAVE_IPV6
1105 case AF_INET6:
1106 break;
1107 #endif
1108 default:
1109 return NULL;
1110 }
1111
1112 switch (type) {
1113 case SWRAP_CONNECT_SEND:
1114 if (si->type != SOCK_STREAM) return NULL;
1115
1116 src_addr = si->myname;
1117 dest_addr = addr;
1118
1119 tcp_seqno = si->io.pck_snd;
1120 tcp_ack = si->io.pck_rcv;
1121 tcp_ctl = 0x02; /* SYN */
1122
1123 si->io.pck_snd += 1;
1124
1125 break;
1126
1127 case SWRAP_CONNECT_RECV:
1128 if (si->type != SOCK_STREAM) return NULL;
1129
1130 dest_addr = si->myname;
1131 src_addr = addr;
1132
1133 tcp_seqno = si->io.pck_rcv;
1134 tcp_ack = si->io.pck_snd;
1135 tcp_ctl = 0x12; /** SYN,ACK */
1136
1137 si->io.pck_rcv += 1;
1138
1139 break;
1140
1141 case SWRAP_CONNECT_UNREACH:
1142 if (si->type != SOCK_STREAM) return NULL;
1143
1144 dest_addr = si->myname;
1145 src_addr = addr;
1146
1147 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
1148 tcp_seqno = si->io.pck_snd - 1;
1149 tcp_ack = si->io.pck_rcv;
1150 tcp_ctl = 0x02; /* SYN */
1151 unreachable = 1;
1152
1153 break;
1154
1155 case SWRAP_CONNECT_ACK:
1156 if (si->type != SOCK_STREAM) return NULL;
1157
1158 src_addr = si->myname;
1159 dest_addr = addr;
1160
1161 tcp_seqno = si->io.pck_snd;
1162 tcp_ack = si->io.pck_rcv;
1163 tcp_ctl = 0x10; /* ACK */
1164
1165 break;
1166
1167 case SWRAP_ACCEPT_SEND:
1168 if (si->type != SOCK_STREAM) return NULL;
1169
1170 dest_addr = si->myname;
1171 src_addr = addr;
1172
1173 tcp_seqno = si->io.pck_rcv;
1174 tcp_ack = si->io.pck_snd;
1175 tcp_ctl = 0x02; /* SYN */
1176
1177 si->io.pck_rcv += 1;
1178
1179 break;
1180
1181 case SWRAP_ACCEPT_RECV:
1182 if (si->type != SOCK_STREAM) return NULL;
1183
1184 src_addr = si->myname;
1185 dest_addr = addr;
1186
1187 tcp_seqno = si->io.pck_snd;
1188 tcp_ack = si->io.pck_rcv;
1189 tcp_ctl = 0x12; /* SYN,ACK */
1190
1191 si->io.pck_snd += 1;
1192
1193 break;
1194
1195 case SWRAP_ACCEPT_ACK:
1196 if (si->type != SOCK_STREAM) return NULL;
1197
1198 dest_addr = si->myname;
1199 src_addr = addr;
1200
1201 tcp_seqno = si->io.pck_rcv;
1202 tcp_ack = si->io.pck_snd;
1203 tcp_ctl = 0x10; /* ACK */
1204
1205 break;
1206
1207 case SWRAP_SEND:
1208 src_addr = si->myname;
1209 dest_addr = si->peername;
1210
1211 tcp_seqno = si->io.pck_snd;
1212 tcp_ack = si->io.pck_rcv;
1213 tcp_ctl = 0x18; /* PSH,ACK */
1214
1215 si->io.pck_snd += len;
1216
1217 break;
1218
1219 case SWRAP_SEND_RST:
1220 dest_addr = si->myname;
1221 src_addr = si->peername;
1222
1223 if (si->type == SOCK_DGRAM) {
1224 return swrap_marshall_packet(si, si->peername,
1225 SWRAP_SENDTO_UNREACH,
1226 buf, len, packet_len);
1227 }
1228
1229 tcp_seqno = si->io.pck_rcv;
1230 tcp_ack = si->io.pck_snd;
1231 tcp_ctl = 0x14; /** RST,ACK */
1232
1233 break;
1234
1235 case SWRAP_PENDING_RST:
1236 dest_addr = si->myname;
1237 src_addr = si->peername;
1238
1239 if (si->type == SOCK_DGRAM) {
1240 return NULL;
1241 }
1242
1243 tcp_seqno = si->io.pck_rcv;
1244 tcp_ack = si->io.pck_snd;
1245 tcp_ctl = 0x14; /* RST,ACK */
1246
1247 break;
1248
1249 case SWRAP_RECV:
1250 dest_addr = si->myname;
1251 src_addr = si->peername;
1252
1253 tcp_seqno = si->io.pck_rcv;
1254 tcp_ack = si->io.pck_snd;
1255 tcp_ctl = 0x18; /* PSH,ACK */
1256
1257 si->io.pck_rcv += len;
1258
1259 break;
1260
1261 case SWRAP_RECV_RST:
1262 dest_addr = si->myname;
1263 src_addr = si->peername;
1264
1265 if (si->type == SOCK_DGRAM) {
1266 return NULL;
1267 }
1268
1269 tcp_seqno = si->io.pck_rcv;
1270 tcp_ack = si->io.pck_snd;
1271 tcp_ctl = 0x14; /* RST,ACK */
1272
1273 break;
1274
1275 case SWRAP_SENDTO:
1276 src_addr = si->myname;
1277 dest_addr = addr;
1278
1279 si->io.pck_snd += len;
1280
1281 break;
1282
1283 case SWRAP_SENDTO_UNREACH:
1284 dest_addr = si->myname;
1285 src_addr = addr;
1286
1287 unreachable = 1;
1288
1289 break;
1290
1291 case SWRAP_RECVFROM:
1292 dest_addr = si->myname;
1293 src_addr = addr;
1294
1295 si->io.pck_rcv += len;
1296
1297 break;
1298
1299 case SWRAP_CLOSE_SEND:
1300 if (si->type != SOCK_STREAM) return NULL;
1301
1302 src_addr = si->myname;
1303 dest_addr = si->peername;
1304
1305 tcp_seqno = si->io.pck_snd;
1306 tcp_ack = si->io.pck_rcv;
1307 tcp_ctl = 0x11; /* FIN, ACK */
1308
1309 si->io.pck_snd += 1;
1310
1311 break;
1312
1313 case SWRAP_CLOSE_RECV:
1314 if (si->type != SOCK_STREAM) return NULL;
1315
1316 dest_addr = si->myname;
1317 src_addr = si->peername;
1318
1319 tcp_seqno = si->io.pck_rcv;
1320 tcp_ack = si->io.pck_snd;
1321 tcp_ctl = 0x11; /* FIN,ACK */
1322
1323 si->io.pck_rcv += 1;
1324
1325 break;
1326
1327 case SWRAP_CLOSE_ACK:
1328 if (si->type != SOCK_STREAM) return NULL;
1329
1330 src_addr = si->myname;
1331 dest_addr = si->peername;
1332
1333 tcp_seqno = si->io.pck_snd;
1334 tcp_ack = si->io.pck_rcv;
1335 tcp_ctl = 0x10; /* ACK */
1336
1337 break;
1338 default:
1339 return NULL;
1340 }
1341
1342 swrapGetTimeOfDay(&tv);
1343
1344 return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1345 (const uint8_t *)buf, len,
1346 tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1347 packet_len);
1348 }
1349
1350 static void swrap_dump_packet(struct socket_info *si,
1351 const struct sockaddr *addr,
1352 enum swrap_packet_type type,
1353 const void *buf, size_t len)
1354 {
1355 const char *file_name;
1356 uint8_t *packet;
1357 size_t packet_len = 0;
1358 int fd;
1359
1360 file_name = socket_wrapper_pcap_file();
1361 if (!file_name) {
1362 return;
1363 }
1364
1365 packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1366 if (!packet) {
1367 return;
1368 }
1369
1370 fd = swrap_get_pcap_fd(file_name);
1371 if (fd != -1) {
1372 if (write(fd, packet, packet_len) != packet_len) {
1373 free(packet);
1374 return;
1375 }
1376 }
1377
1378 free(packet);
1379 }
1380
1381 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
1382 {
1383 struct socket_info *si;
1384 int fd;
1385
1386 if (!socket_wrapper_dir()) {
1387 return real_socket(family, type, protocol);
1388 }
1389
1390 switch (family) {
1391 case AF_INET:
1392 #ifdef HAVE_IPV6
1393 case AF_INET6:
1394 #endif
1395 break;
1396 case AF_UNIX:
1397 return real_socket(family, type, protocol);
1398 default:
1399 errno = EAFNOSUPPORT;
1400 return -1;
1401 }
1402
1403 switch (type) {
1404 case SOCK_STREAM:
1405 break;
1406 case SOCK_DGRAM:
1407 break;
1408 default:
1409 errno = EPROTONOSUPPORT;
1410 return -1;
1411 }
1412
1413 switch (protocol) {
1414 case 0:
1415 break;
1416 case 6:
1417 if (type == SOCK_STREAM) {
1418 break;
1419 }
1420 /*fall through*/
1421 case 17:
1422 if (type == SOCK_DGRAM) {
1423 break;
1424 }
1425 /*fall through*/
1426 default:
1427 errno = EPROTONOSUPPORT;
1428 return -1;
1429 }
1430
1431 fd = real_socket(AF_UNIX, type, 0);
1432
1433 if (fd == -1) return -1;
1434
1435 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1436
1437 si->family = family;
1438 si->type = type;
1439 si->protocol = protocol;
1440 si->fd = fd;
1441
1442 SWRAP_DLIST_ADD(sockets, si);
1443
1444 return si->fd;
1445 }
1446
1447 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1448 {
1449 struct socket_info *parent_si, *child_si;
1450 int fd;
1451 struct sockaddr_un un_addr;
1452 socklen_t un_addrlen = sizeof(un_addr);
1453 struct sockaddr_un un_my_addr;
1454 socklen_t un_my_addrlen = sizeof(un_my_addr);
1455 struct sockaddr *my_addr;
1456 socklen_t my_addrlen, len;
1457 int ret;
1458
1459 parent_si = find_socket_info(s);
1460 if (!parent_si) {
1461 return real_accept(s, addr, addrlen);
1462 }
1463
1464 /*
1465 * assume out sockaddr have the same size as the in parent
1466 * socket family
1467 */
1468 my_addrlen = socket_length(parent_si->family);
1469 if (my_addrlen <= 0) {
1470 errno = EINVAL;
1471 return -1;
1472 }
1473
1474 my_addr = (struct sockaddr *)malloc(my_addrlen);
1475 if (my_addr == NULL) {
1476 return -1;
1477 }
1478
1479 memset(&un_addr, 0, sizeof(un_addr));
1480 memset(&un_my_addr, 0, sizeof(un_my_addr));
1481
1482 ret = real_accept(s, (struct sockaddr *)&un_addr, &un_addrlen);
1483 if (ret == -1) {
1484 free(my_addr);
1485 return ret;
1486 }
1487
1488 fd = ret;
1489
1490 len = my_addrlen;
1491 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1492 parent_si->family, my_addr, &len);
1493 if (ret == -1) {
1494 free(my_addr);
1495 close(fd);
1496 return ret;
1497 }
1498
1499 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1500 memset(child_si, 0, sizeof(*child_si));
1501
1502 child_si->fd = fd;
1503 child_si->family = parent_si->family;
1504 child_si->type = parent_si->type;
1505 child_si->protocol = parent_si->protocol;
1506 child_si->bound = 1;
1507 child_si->is_server = 1;
1508 child_si->connected = 1;
1509
1510 child_si->peername_len = len;
1511 child_si->peername = sockaddr_dup(my_addr, len);
1512
1513 if (addr != NULL && addrlen != NULL) {
1514 *addrlen = len;
1515 if (*addrlen >= len)
1516 memcpy(addr, my_addr, len);
1517 *addrlen = 0;
1518 }
1519
1520 ret = real_getsockname(fd, (struct sockaddr *)&un_my_addr, &un_my_addrlen);
1521 if (ret == -1) {
1522 free(child_si);
1523 close(fd);
1524 return ret;
1525 }
1526
1527 len = my_addrlen;
1528 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1529 child_si->family, my_addr, &len);
1530 if (ret == -1) {
1531 free(child_si);
1532 free(my_addr);
1533 close(fd);
1534 return ret;
1535 }
1536
1537 child_si->myname_len = len;
1538 child_si->myname = sockaddr_dup(my_addr, len);
1539 free(my_addr);
1540
1541 SWRAP_DLIST_ADD(sockets, child_si);
1542
1543 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1544 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1545 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1546
1547 return fd;
1548 }
1549
1550 static int autobind_start_init;
1551 static int autobind_start;
1552
1553 /* using sendto() or connect() on an unbound socket would give the
1554 recipient no way to reply, as unlike UDP and TCP, a unix domain
1555 socket can't auto-assign emphemeral port numbers, so we need to
1556 assign it here.
1557 Note: this might change the family from ipv6 to ipv4
1558 */
1559 static int swrap_auto_bind(struct socket_info *si, int family)
1560 {
1561 struct sockaddr_un un_addr;
1562 int i;
1563 char type;
1564 int ret;
1565 int port;
1566 struct stat st;
1567
1568 if (autobind_start_init != 1) {
1569 autobind_start_init = 1;
1570 autobind_start = getpid();
1571 autobind_start %= 50000;
1572 autobind_start += 10000;
1573 }
1574
1575 un_addr.sun_family = AF_UNIX;
1576
1577 switch (family) {
1578 case AF_INET: {
1579 struct sockaddr_in in;
1580
1581 switch (si->type) {
1582 case SOCK_STREAM:
1583 type = SOCKET_TYPE_CHAR_TCP;
1584 break;
1585 case SOCK_DGRAM:
1586 type = SOCKET_TYPE_CHAR_UDP;
1587 break;
1588 default:
1589 errno = ESOCKTNOSUPPORT;
1590 return -1;
1591 }
1592
1593 memset(&in, 0, sizeof(in));
1594 in.sin_family = AF_INET;
1595 in.sin_addr.s_addr = htonl(127<<24 |
1596 socket_wrapper_default_iface());
1597
1598 si->myname_len = sizeof(in);
1599 si->myname = sockaddr_dup(&in, si->myname_len);
1600 break;
1601 }
1602 #ifdef HAVE_IPV6
1603 case AF_INET6: {
1604 struct sockaddr_in6 in6;
1605
1606 if (si->family != family) {
1607 errno = ENETUNREACH;
1608 return -1;
1609 }
1610
1611 switch (si->type) {
1612 case SOCK_STREAM:
1613 type = SOCKET_TYPE_CHAR_TCP_V6;
1614 break;
1615 case SOCK_DGRAM:
1616 type = SOCKET_TYPE_CHAR_UDP_V6;
1617 break;
1618 default:
1619 errno = ESOCKTNOSUPPORT;
1620 return -1;
1621 }
1622
1623 memset(&in6, 0, sizeof(in6));
1624 in6.sin6_family = AF_INET6;
1625 in6.sin6_addr = *swrap_ipv6();
1626 in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
1627 si->myname_len = sizeof(in6);
1628 si->myname = sockaddr_dup(&in6, si->myname_len);
1629 break;
1630 }
1631 #endif
1632 default:
1633 errno = ESOCKTNOSUPPORT;
1634 return -1;
1635 }
1636
1637 if (autobind_start > 60000) {
1638 autobind_start = 10000;
1639 }
1640
1641 for (i=0;i<1000;i++) {
1642 port = autobind_start + i;
1643 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1644 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1645 type, socket_wrapper_default_iface(), port);
1646 if (stat(un_addr.sun_path, &st) == 0) continue;
1647
1648 ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
1649 if (ret == -1) return ret;
1650
1651 si->tmp_path = strdup(un_addr.sun_path);
1652 si->bound = 1;
1653 autobind_start = port + 1;
1654 break;
1655 }
1656 if (i == 1000) {
1657 errno = ENFILE;
1658 return -1;
1659 }
1660
1661 si->family = family;
1662 set_port(si->family, port, si->myname);
1663
1664 return 0;
1665 }
1666
1667
1668 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1669 {
1670 int ret;
1671 struct sockaddr_un un_addr;
1672 struct socket_info *si = find_socket_info(s);
1673
1674 if (!si) {
1675 return real_connect(s, serv_addr, addrlen);
1676 }
1677
1678 if (si->bound == 0) {
1679 ret = swrap_auto_bind(si, serv_addr->sa_family);
1680 if (ret == -1) return -1;
1681 }
1682
1683 if (si->family != serv_addr->sa_family) {
1684 errno = EINVAL;
1685 return -1;
1686 }
1687
1688 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
1689 if (ret == -1) return -1;
1690
1691 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1692
1693 ret = real_connect(s, (struct sockaddr *)&un_addr,
1694 sizeof(struct sockaddr_un));
1695
1696 /* to give better errors */
1697 if (ret == -1 && errno == ENOENT) {
1698 errno = EHOSTUNREACH;
1699 }
1700
1701 if (ret == 0) {
1702 si->peername_len = addrlen;
1703 si->peername = sockaddr_dup(serv_addr, addrlen);
1704 si->connected = 1;
1705
1706 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1707 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1708 } else {
1709 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1710 }
1711
1712 return ret;
1713 }
1714
1715 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1716 {
1717 int ret;
1718 struct sockaddr_un un_addr;
1719 struct socket_info *si = find_socket_info(s);
1720
1721 if (!si) {
1722 return real_bind(s, myaddr, addrlen);
1723 }
1724
1725 si->myname_len = addrlen;
1726 si->myname = sockaddr_dup(myaddr, addrlen);
1727
1728 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
1729 if (ret == -1) return -1;
1730
1731 unlink(un_addr.sun_path);
1732
1733 ret = real_bind(s, (struct sockaddr *)&un_addr,
1734 sizeof(struct sockaddr_un));
1735
1736 if (ret == 0) {
1737 si->bound = 1;
1738 }
1739
1740 return ret;
1741 }
1742
1743 _PUBLIC_ int swrap_listen(int s, int backlog)
1744 {
1745 int ret;
1746 struct socket_info *si = find_socket_info(s);
1747
1748 if (!si) {
1749 return real_listen(s, backlog);
1750 }
1751
1752 ret = real_listen(s, backlog);
1753
1754 return ret;
1755 }
1756
1757 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1758 {
1759 struct socket_info *si = find_socket_info(s);
1760
1761 if (!si) {
1762 return real_getpeername(s, name, addrlen);
1763 }
1764
1765 if (!si->peername)
1766 {
1767 errno = ENOTCONN;
1768 return -1;
1769 }
1770
1771 memcpy(name, si->peername, si->peername_len);
1772 *addrlen = si->peername_len;
1773
1774 return 0;
1775 }
1776
1777 _PUBLIC_ int swrap_getsockname(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_getsockname(s, name, addrlen);
1783 }
1784
1785 memcpy(name, si->myname, si->myname_len);
1786 *addrlen = si->myname_len;
1787
1788 return 0;
1789 }
1790
1791 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1792 {
1793 struct socket_info *si = find_socket_info(s);
1794
1795 if (!si) {
1796 return real_getsockopt(s, level, optname, optval, optlen);
1797 }
1798
1799 if (level == SOL_SOCKET) {
1800 return real_getsockopt(s, level, optname, optval, optlen);
1801 }
1802
1803 errno = ENOPROTOOPT;
1804 return -1;
1805 }
1806
1807 _PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1808 {
1809 struct socket_info *si = find_socket_info(s);
1810
1811 if (!si) {
1812 return real_setsockopt(s, level, optname, optval, optlen);
1813 }
1814
1815 if (level == SOL_SOCKET) {
1816 return real_setsockopt(s, level, optname, optval, optlen);
1817 }
1818
1819 switch (si->family) {
1820 case AF_INET:
1821 return 0;
1822 default:
1823 errno = ENOPROTOOPT;
1824 return -1;
1825 }
1826 }
1827
1828 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
1829 {
1830 struct sockaddr_un un_addr;
1831 socklen_t un_addrlen = sizeof(un_addr);
1832 int ret;
1833 struct socket_info *si = find_socket_info(s);
1834 struct sockaddr_storage ss;
1835 socklen_t ss_len = sizeof(ss);
1836
1837 if (!si) {
1838 return real_recvfrom(s, buf, len, flags, from, fromlen);
1839 }
1840
1841 if (!from) {
1842 from = (struct sockaddr *)&ss;
1843 fromlen = &ss_len;
1844 }
1845
1846 len = MIN(len, 1500);
1847
1848 /* irix 6.4 forgets to null terminate the sun_path string :-( */
1849 memset(&un_addr, 0, sizeof(un_addr));
1850 ret = real_recvfrom(s, buf, len, flags, (struct sockaddr *)&un_addr, &un_addrlen);
1851 if (ret == -1)
1852 return ret;
1853
1854 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
1855 si->family, from, fromlen) == -1) {
1856 return -1;
1857 }
1858
1859 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
1860
1861 return ret;
1862 }
1863
1864
1865 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
1866 {
1867 struct sockaddr_un un_addr;
1868 int ret;
1869 struct socket_info *si = find_socket_info(s);
1870 int bcast = 0;
1871
1872 if (!si) {
1873 return real_sendto(s, buf, len, flags, to, tolen);
1874 }
1875
1876 if (si->connected) {
1877 if (to) {
1878 errno = EISCONN;
1879 return -1;
1880 }
1881
1882 to = si->peername;
1883 tolen = si->peername_len;
1884 }
1885
1886 len = MIN(len, 1500);
1887
1888 switch (si->type) {
1889 case SOCK_STREAM:
1890 ret = real_send(s, buf, len, flags);
1891 break;
1892 case SOCK_DGRAM:
1893 if (si->bound == 0) {
1894 ret = swrap_auto_bind(si, si->family);
1895 if (ret == -1) return -1;
1896 }
1897
1898 ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
1899 if (ret == -1) return -1;
1900
1901 if (bcast) {
1902 struct stat st;
1903 unsigned int iface;
1904 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
1905 char type;
1906
1907 type = SOCKET_TYPE_CHAR_UDP;
1908
1909 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
1910 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
1911 socket_wrapper_dir(), type, iface, prt);
1912 if (stat(un_addr.sun_path, &st) != 0) continue;
1913
1914 /* ignore the any errors in broadcast sends */
1915 real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1916 }
1917
1918 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1919
1920 return len;
1921 }
1922
1923 ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1924 break;
1925 default:
1926 ret = -1;
1927 errno = EHOSTUNREACH;
1928 break;
1929 }
1930
1931 /* to give better errors */
1932 if (ret == -1 && errno == ENOENT) {
1933 errno = EHOSTUNREACH;
1934 }
1935
1936 if (ret == -1) {
1937 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1938 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
1939 } else {
1940 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, ret);
1941 }
1942
1943 return ret;
1944 }
1945
1946 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1947 {
1948 int ret;
1949 struct socket_info *si = find_socket_info(s);
1950 int value;
1951
1952 if (!si) {
1953 return real_ioctl(s, r, p);
1954 }
1955
1956 ret = real_ioctl(s, r, p);
1957
1958 switch (r) {
1959 case FIONREAD:
1960 value = *((int *)p);
1961 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1962 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1963 } else if (value == 0) { /* END OF FILE */
1964 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1965 }
1966 break;
1967 }
1968
1969 return ret;
1970 }
1971
1972 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
1973 {
1974 int ret;
1975 struct socket_info *si = find_socket_info(s);
1976
1977 if (!si) {
1978 return real_recv(s, buf, len, flags);
1979 }
1980
1981 len = MIN(len, 1500);
1982
1983 ret = real_recv(s, buf, len, flags);
1984 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1985 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1986 } else if (ret == 0) { /* END OF FILE */
1987 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1988 } else if (ret > 0) {
1989 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
1990 }
1991
1992 return ret;
1993 }
1994
1995
1996 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
1997 {
1998 int ret;
1999 struct socket_info *si = find_socket_info(s);
2000
2001 if (!si) {
2002 return real_send(s, buf, len, flags);
2003 }
2004
2005 len = MIN(len, 1500);
2006
2007 ret = real_send(s, buf, len, flags);
2008
2009 if (ret == -1) {
2010 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2011 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2012 } else {
2013 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
2014 }
2015
2016 return ret;
2017 }
2018
2019 int swrap_readv(int s, const struct iovec *vector, size_t count)
2020 {
2021 int ret;
2022 struct socket_info *si = find_socket_info(s);
2023 struct iovec v;
2024
2025 if (!si) {
2026 return real_readv(s, vector, count);
2027 }
2028
2029 /* we read 1500 bytes as maximum */
2030 if (count > 0) {
2031 size_t i, len = 0;
2032
2033 for (i=0; i < count; i++) {
2034 size_t nlen;
2035 nlen = len + vector[i].iov_len;
2036 if (nlen > 1500) {
2037 break;
2038 }
2039 }
2040 count = i;
2041 if (count == 0) {
2042 v = vector[0];
2043 v.iov_len = MIN(v.iov_len, 1500);
2044 vector = &v;
2045 count = 1;
2046 }
2047 }
2048
2049 ret = real_readv(s, vector, count);
2050 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2051 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2052 } else if (ret == 0) { /* END OF FILE */
2053 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2054 } else if (ret > 0) {
2055 uint8_t *buf;
2056 off_t ofs = 0;
2057 size_t i;
2058 size_t remain = ret;
2059
2060 /* we capture it as one single packet */
2061 buf = (uint8_t *)malloc(ret);
2062 if (!buf) {
2063 /* we just not capture the packet */
2064 errno = 0;
2065 return ret;
2066 }
2067
2068 for (i=0; i < count; i++) {
2069 size_t this_time = MIN(remain, vector[i].iov_len);
2070 memcpy(buf + ofs,
2071 vector[i].iov_base,
2072 this_time);
2073 ofs += this_time;
2074 remain -= this_time;
2075 }
2076
2077 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2078 free(buf);
2079 }
2080
2081 return ret;
2082 }
2083
2084 int swrap_writev(int s, const struct iovec *vector, size_t count)
2085 {
2086 int ret;
2087 struct socket_info *si = find_socket_info(s);
2088 struct iovec v;
2089
2090 if (!si) {
2091 return real_writev(s, vector, count);
2092 }
2093
2094 /* we write 1500 bytes as maximum */
2095 if (count > 0) {
2096 size_t i, len = 0;
2097
2098 for (i=0; i < count; i++) {
2099 size_t nlen;
2100 nlen = len + vector[i].iov_len;
2101 if (nlen > 1500) {
2102 break;
2103 }
2104 }
2105 count = i;
2106 if (count == 0) {
2107 v = vector[0];
2108 v.iov_len = MIN(v.iov_len, 1500);
2109 vector = &v;
2110 count = 1;
2111 }
2112 }
2113
2114 ret = real_writev(s, vector, count);
2115 if (ret == -1) {
2116 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2117 } else {
2118 uint8_t *buf;
2119 off_t ofs = 0;
2120 size_t i;
2121 size_t remain = ret;
2122
2123 /* we capture it as one single packet */
2124 buf = (uint8_t *)malloc(ret);
2125 if (!buf) {
2126 /* we just not capture the packet */
2127 errno = 0;
2128 return ret;
2129 }
2130
2131 for (i=0; i < count; i++) {
2132 size_t this_time = MIN(remain, vector[i].iov_len);
2133 memcpy(buf + ofs,
2134 vector[i].iov_base,
2135 this_time);
2136 ofs += this_time;
2137 remain -= this_time;
2138 }
2139
2140 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
2141 free(buf);
2142 }
2143
2144 return ret;
2145 }
2146
2147 _PUBLIC_ int swrap_close(int fd)
2148 {
2149 struct socket_info *si = find_socket_info(fd);
2150 int ret;
2151
2152 if (!si) {
2153 return real_close(fd);
2154 }
2155
2156 SWRAP_DLIST_REMOVE(sockets, si);
2157
2158 if (si->myname && si->peername) {
2159 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
2160 }
2161
2162 ret = real_close(fd);
2163
2164 if (si->myname && si->peername) {
2165 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
2166 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
2167 }
2168
2169 if (si->path) free(si->path);
2170 if (si->myname) free(si->myname);
2171 if (si->peername) free(si->peername);
2172 if (si->tmp_path) {
2173 unlink(si->tmp_path);
2174 free(si->tmp_path);
2175 }
2176 free(si);
2177
2178 return ret;
2179 }
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