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Convert cli_push to tevent_req
[Samba/ekacnet.git] / lib / socket_wrapper / socket_wrapper.c
blob553827b1922103dba6851ab24506f6d8d092f274
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 int defer_connect;
222
223 char *path;
224 char *tmp_path;
225
226 struct sockaddr *myname;
227 socklen_t myname_len;
228
229 struct sockaddr *peername;
230 socklen_t peername_len;
231
232 struct {
233 unsigned long pck_snd;
234 unsigned long pck_rcv;
235 } io;
236
237 struct socket_info *prev, *next;
238 };
239
240 static struct socket_info *sockets;
241
242 const char *socket_wrapper_dir(void)
243 {
244 const char *s = getenv("SOCKET_WRAPPER_DIR");
245 if (s == NULL) {
246 return NULL;
247 }
248 if (strncmp(s, "./", 2) == 0) {
249 s += 2;
250 }
251 return s;
252 }
253
254 unsigned int socket_wrapper_default_iface(void)
255 {
256 const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
257 if (s) {
258 unsigned int iface;
259 if (sscanf(s, "%u", &iface) == 1) {
260 if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
261 return iface;
262 }
263 }
264 }
265
266 return 1;/* 127.0.0.1 */
267 }
268
269 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
270 {
271 unsigned int iface;
272 unsigned int prt;
273 const char *p;
274 char type;
275
276 p = strrchr(un->sun_path, '/');
277 if (p) p++; else p = un->sun_path;
278
279 if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
280 errno = EINVAL;
281 return -1;
282 }
283
284 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
285 errno = EINVAL;
286 return -1;
287 }
288
289 if (prt > 0xFFFF) {
290 errno = EINVAL;
291 return -1;
292 }
293
294 switch(type) {
295 case SOCKET_TYPE_CHAR_TCP:
296 case SOCKET_TYPE_CHAR_UDP: {
297 struct sockaddr_in *in2 = (struct sockaddr_in *)in;
298
299 if ((*len) < sizeof(*in2)) {
300 errno = EINVAL;
301 return -1;
302 }
303
304 memset(in2, 0, sizeof(*in2));
305 in2->sin_family = AF_INET;
306 in2->sin_addr.s_addr = htonl((127<<24) | iface);
307 in2->sin_port = htons(prt);
308
309 *len = sizeof(*in2);
310 break;
311 }
312 #ifdef HAVE_IPV6
313 case SOCKET_TYPE_CHAR_TCP_V6:
314 case SOCKET_TYPE_CHAR_UDP_V6: {
315 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)in;
316
317 if ((*len) < sizeof(*in2)) {
318 errno = EINVAL;
319 return -1;
320 }
321
322 memset(in2, 0, sizeof(*in2));
323 in2->sin6_family = AF_INET6;
324 in2->sin6_addr = *swrap_ipv6();
325 in2->sin6_addr.s6_addr[15] = iface;
326 in2->sin6_port = htons(prt);
327
328 *len = sizeof(*in2);
329 break;
330 }
331 #endif
332 default:
333 errno = EINVAL;
334 return -1;
335 }
336
337 return 0;
338 }
339
340 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
341 int *bcast)
342 {
343 char type = '\0';
344 unsigned int prt;
345 unsigned int iface;
346 int is_bcast = 0;
347
348 if (bcast) *bcast = 0;
349
350 switch (si->family) {
351 case AF_INET: {
352 const struct sockaddr_in *in =
353 (const struct sockaddr_in *)inaddr;
354 unsigned int addr = ntohl(in->sin_addr.s_addr);
355 char u_type = '\0';
356 char b_type = '\0';
357 char a_type = '\0';
358
359 switch (si->type) {
360 case SOCK_STREAM:
361 u_type = SOCKET_TYPE_CHAR_TCP;
362 break;
363 case SOCK_DGRAM:
364 u_type = SOCKET_TYPE_CHAR_UDP;
365 a_type = SOCKET_TYPE_CHAR_UDP;
366 b_type = SOCKET_TYPE_CHAR_UDP;
367 break;
368 }
369
370 prt = ntohs(in->sin_port);
371 if (a_type && addr == 0xFFFFFFFF) {
372 /* 255.255.255.255 only udp */
373 is_bcast = 2;
374 type = a_type;
375 iface = socket_wrapper_default_iface();
376 } else if (b_type && addr == 0x7FFFFFFF) {
377 /* 127.255.255.255 only udp */
378 is_bcast = 1;
379 type = b_type;
380 iface = socket_wrapper_default_iface();
381 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
382 /* 127.0.0.X */
383 is_bcast = 0;
384 type = u_type;
385 iface = (addr & 0x000000FF);
386 } else {
387 errno = ENETUNREACH;
388 return -1;
389 }
390 if (bcast) *bcast = is_bcast;
391 break;
392 }
393 #ifdef HAVE_IPV6
394 case AF_INET6: {
395 const struct sockaddr_in6 *in =
396 (const struct sockaddr_in6 *)inaddr;
397 struct in6_addr cmp;
398
399 switch (si->type) {
400 case SOCK_STREAM:
401 type = SOCKET_TYPE_CHAR_TCP_V6;
402 break;
403 case SOCK_DGRAM:
404 type = SOCKET_TYPE_CHAR_UDP_V6;
405 break;
406 }
407
408 /* XXX no multicast/broadcast */
409
410 prt = ntohs(in->sin6_port);
411
412 cmp = in->sin6_addr;
413 cmp.s6_addr[15] = 0;
414 if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
415 iface = in->sin6_addr.s6_addr[15];
416 } else {
417 errno = ENETUNREACH;
418 return -1;
419 }
420
421 break;
422 }
423 #endif
424 default:
425 errno = ENETUNREACH;
426 return -1;
427 }
428
429 if (prt == 0) {
430 errno = EINVAL;
431 return -1;
432 }
433
434 if (is_bcast) {
435 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
436 socket_wrapper_dir());
437 /* the caller need to do more processing */
438 return 0;
439 }
440
441 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
442 socket_wrapper_dir(), type, iface, prt);
443
444 return 0;
445 }
446
447 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
448 int *bcast)
449 {
450 char type = '\0';
451 unsigned int prt;
452 unsigned int iface;
453 struct stat st;
454 int is_bcast = 0;
455
456 if (bcast) *bcast = 0;
457
458 switch (si->family) {
459 case AF_INET: {
460 const struct sockaddr_in *in =
461 (const struct sockaddr_in *)inaddr;
462 unsigned int addr = ntohl(in->sin_addr.s_addr);
463 char u_type = '\0';
464 char d_type = '\0';
465 char b_type = '\0';
466 char a_type = '\0';
467
468 prt = ntohs(in->sin_port);
469
470 switch (si->type) {
471 case SOCK_STREAM:
472 u_type = SOCKET_TYPE_CHAR_TCP;
473 d_type = SOCKET_TYPE_CHAR_TCP;
474 break;
475 case SOCK_DGRAM:
476 u_type = SOCKET_TYPE_CHAR_UDP;
477 d_type = SOCKET_TYPE_CHAR_UDP;
478 a_type = SOCKET_TYPE_CHAR_UDP;
479 b_type = SOCKET_TYPE_CHAR_UDP;
480 break;
481 }
482
483 if (addr == 0) {
484 /* 0.0.0.0 */
485 is_bcast = 0;
486 type = d_type;
487 iface = socket_wrapper_default_iface();
488 } else if (a_type && addr == 0xFFFFFFFF) {
489 /* 255.255.255.255 only udp */
490 is_bcast = 2;
491 type = a_type;
492 iface = socket_wrapper_default_iface();
493 } else if (b_type && addr == 0x7FFFFFFF) {
494 /* 127.255.255.255 only udp */
495 is_bcast = 1;
496 type = b_type;
497 iface = socket_wrapper_default_iface();
498 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
499 /* 127.0.0.X */
500 is_bcast = 0;
501 type = u_type;
502 iface = (addr & 0x000000FF);
503 } else {
504 errno = EADDRNOTAVAIL;
505 return -1;
506 }
507 break;
508 }
509 #ifdef HAVE_IPV6
510 case AF_INET6: {
511 const struct sockaddr_in6 *in =
512 (const struct sockaddr_in6 *)inaddr;
513 struct in6_addr cmp;
514
515 switch (si->type) {
516 case SOCK_STREAM:
517 type = SOCKET_TYPE_CHAR_TCP_V6;
518 break;
519 case SOCK_DGRAM:
520 type = SOCKET_TYPE_CHAR_UDP_V6;
521 break;
522 }
523
524 /* XXX no multicast/broadcast */
525
526 prt = ntohs(in->sin6_port);
527
528 cmp = in->sin6_addr;
529 cmp.s6_addr[15] = 0;
530 if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
531 iface = socket_wrapper_default_iface();
532 } else if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
533 iface = in->sin6_addr.s6_addr[15];
534 } else {
535 errno = EADDRNOTAVAIL;
536 return -1;
537 }
538
539 break;
540 }
541 #endif
542 default:
543 errno = EADDRNOTAVAIL;
544 return -1;
545 }
546
547
548 if (bcast) *bcast = is_bcast;
549
550 if (prt == 0) {
551 /* handle auto-allocation of ephemeral ports */
552 for (prt = 5001; prt < 10000; prt++) {
553 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
554 socket_wrapper_dir(), type, iface, prt);
555 if (stat(un->sun_path, &st) == 0) continue;
556
557 set_port(si->family, prt, si->myname);
558 break;
559 }
560 if (prt == 10000) {
561 errno = ENFILE;
562 return -1;
563 }
564 }
565
566 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
567 socket_wrapper_dir(), type, iface, prt);
568 return 0;
569 }
570
571 static struct socket_info *find_socket_info(int fd)
572 {
573 struct socket_info *i;
574 for (i = sockets; i; i = i->next) {
575 if (i->fd == fd)
576 return i;
577 }
578
579 return NULL;
580 }
581
582 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
583 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
584 {
585 if (!out_addr)
586 return 0;
587
588 out_addr->sun_family = AF_UNIX;
589
590 switch (in_addr->sa_family) {
591 case AF_INET:
592 #ifdef HAVE_IPV6
593 case AF_INET6:
594 #endif
595 switch (si->type) {
596 case SOCK_STREAM:
597 case SOCK_DGRAM:
598 break;
599 default:
600 errno = ESOCKTNOSUPPORT;
601 return -1;
602 }
603 if (alloc_sock) {
604 return convert_in_un_alloc(si, in_addr, out_addr, bcast);
605 } else {
606 return convert_in_un_remote(si, in_addr, out_addr, bcast);
607 }
608 default:
609 break;
610 }
611
612 errno = EAFNOSUPPORT;
613 return -1;
614 }
615
616 static int sockaddr_convert_from_un(const struct socket_info *si,
617 const struct sockaddr_un *in_addr,
618 socklen_t un_addrlen,
619 int family,
620 struct sockaddr *out_addr,
621 socklen_t *out_addrlen)
622 {
623 if (out_addr == NULL || out_addrlen == NULL)
624 return 0;
625
626 if (un_addrlen == 0) {
627 *out_addrlen = 0;
628 return 0;
629 }
630
631 switch (family) {
632 case AF_INET:
633 #ifdef HAVE_IPV6
634 case AF_INET6:
635 #endif
636 switch (si->type) {
637 case SOCK_STREAM:
638 case SOCK_DGRAM:
639 break;
640 default:
641 errno = ESOCKTNOSUPPORT;
642 return -1;
643 }
644 return convert_un_in(in_addr, out_addr, out_addrlen);
645 default:
646 break;
647 }
648
649 errno = EAFNOSUPPORT;
650 return -1;
651 }
652
653 enum swrap_packet_type {
654 SWRAP_CONNECT_SEND,
655 SWRAP_CONNECT_UNREACH,
656 SWRAP_CONNECT_RECV,
657 SWRAP_CONNECT_ACK,
658 SWRAP_ACCEPT_SEND,
659 SWRAP_ACCEPT_RECV,
660 SWRAP_ACCEPT_ACK,
661 SWRAP_RECVFROM,
662 SWRAP_SENDTO,
663 SWRAP_SENDTO_UNREACH,
664 SWRAP_PENDING_RST,
665 SWRAP_RECV,
666 SWRAP_RECV_RST,
667 SWRAP_SEND,
668 SWRAP_SEND_RST,
669 SWRAP_CLOSE_SEND,
670 SWRAP_CLOSE_RECV,
671 SWRAP_CLOSE_ACK
672 };
673
674 struct swrap_file_hdr {
675 uint32_t magic;
676 uint16_t version_major;
677 uint16_t version_minor;
678 int32_t timezone;
679 uint32_t sigfigs;
680 uint32_t frame_max_len;
681 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
682 uint32_t link_type;
683 };
684 #define SWRAP_FILE_HDR_SIZE 24
685
686 struct swrap_packet_frame {
687 uint32_t seconds;
688 uint32_t micro_seconds;
689 uint32_t recorded_length;
690 uint32_t full_length;
691 };
692 #define SWRAP_PACKET_FRAME_SIZE 16
693
694 union swrap_packet_ip {
695 struct {
696 uint8_t ver_hdrlen;
697 uint8_t tos;
698 uint16_t packet_length;
699 uint16_t identification;
700 uint8_t flags;
701 uint8_t fragment;
702 uint8_t ttl;
703 uint8_t protocol;
704 uint16_t hdr_checksum;
705 uint32_t src_addr;
706 uint32_t dest_addr;
707 } v4;
708 #define SWRAP_PACKET_IP_V4_SIZE 20
709 struct {
710 uint8_t ver_prio;
711 uint8_t flow_label_high;
712 uint16_t flow_label_low;
713 uint16_t payload_length;
714 uint8_t next_header;
715 uint8_t hop_limit;
716 uint8_t src_addr[16];
717 uint8_t dest_addr[16];
718 } v6;
719 #define SWRAP_PACKET_IP_V6_SIZE 40
720 };
721 #define SWRAP_PACKET_IP_SIZE 40
722
723 union swrap_packet_payload {
724 struct {
725 uint16_t source_port;
726 uint16_t dest_port;
727 uint32_t seq_num;
728 uint32_t ack_num;
729 uint8_t hdr_length;
730 uint8_t control;
731 uint16_t window;
732 uint16_t checksum;
733 uint16_t urg;
734 } tcp;
735 #define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
736 struct {
737 uint16_t source_port;
738 uint16_t dest_port;
739 uint16_t length;
740 uint16_t checksum;
741 } udp;
742 #define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
743 struct {
744 uint8_t type;
745 uint8_t code;
746 uint16_t checksum;
747 uint32_t unused;
748 } icmp4;
749 #define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
750 struct {
751 uint8_t type;
752 uint8_t code;
753 uint16_t checksum;
754 uint32_t unused;
755 } icmp6;
756 #define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
757 };
758 #define SWRAP_PACKET_PAYLOAD_SIZE 20
759
760 #define SWRAP_PACKET_MIN_ALLOC \
761 (SWRAP_PACKET_FRAME_SIZE + \
762 SWRAP_PACKET_IP_SIZE + \
763 SWRAP_PACKET_PAYLOAD_SIZE)
764
765 static const char *socket_wrapper_pcap_file(void)
766 {
767 static int initialized = 0;
768 static const char *s = NULL;
769 static const struct swrap_file_hdr h;
770 static const struct swrap_packet_frame f;
771 static const union swrap_packet_ip i;
772 static const union swrap_packet_payload p;
773
774 if (initialized == 1) {
775 return s;
776 }
777 initialized = 1;
778
779 /*
780 * TODO: don't use the structs use plain buffer offsets
781 * and PUSH_U8(), PUSH_U16() and PUSH_U32()
782 *
783 * for now make sure we disable PCAP support
784 * if the struct has alignment!
785 */
786 if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
787 return NULL;
788 }
789 if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
790 return NULL;
791 }
792 if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
793 return NULL;
794 }
795 if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
796 return NULL;
797 }
798 if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
799 return NULL;
800 }
801 if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
802 return NULL;
803 }
804 if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
805 return NULL;
806 }
807 if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
808 return NULL;
809 }
810 if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
811 return NULL;
812 }
813 if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
814 return NULL;
815 }
816
817 s = getenv("SOCKET_WRAPPER_PCAP_FILE");
818 if (s == NULL) {
819 return NULL;
820 }
821 if (strncmp(s, "./", 2) == 0) {
822 s += 2;
823 }
824 return s;
825 }
826
827 static uint8_t *swrap_packet_init(struct timeval *tval,
828 const struct sockaddr *src,
829 const struct sockaddr *dest,
830 int socket_type,
831 const uint8_t *payload,
832 size_t payload_len,
833 unsigned long tcp_seqno,
834 unsigned long tcp_ack,
835 unsigned char tcp_ctl,
836 int unreachable,
837 size_t *_packet_len)
838 {
839 uint8_t *base;
840 uint8_t *buf;
841 struct swrap_packet_frame *frame;
842 union swrap_packet_ip *ip;
843 union swrap_packet_payload *pay;
844 size_t packet_len;
845 size_t alloc_len;
846 size_t nonwire_len = sizeof(*frame);
847 size_t wire_hdr_len = 0;
848 size_t wire_len = 0;
849 size_t ip_hdr_len = 0;
850 size_t icmp_hdr_len = 0;
851 size_t icmp_truncate_len = 0;
852 uint8_t protocol = 0, icmp_protocol = 0;
853 const struct sockaddr_in *src_in = NULL;
854 const struct sockaddr_in *dest_in = NULL;
855 #ifdef HAVE_IPV6
856 const struct sockaddr_in6 *src_in6 = NULL;
857 const struct sockaddr_in6 *dest_in6 = NULL;
858 #endif
859 uint16_t src_port;
860 uint16_t dest_port;
861
862 switch (src->sa_family) {
863 case AF_INET:
864 src_in = (const struct sockaddr_in *)src;
865 dest_in = (const struct sockaddr_in *)dest;
866 src_port = src_in->sin_port;
867 dest_port = dest_in->sin_port;
868 ip_hdr_len = sizeof(ip->v4);
869 break;
870 #ifdef HAVE_IPV6
871 case AF_INET6:
872 src_in6 = (const struct sockaddr_in6 *)src;
873 dest_in6 = (const struct sockaddr_in6 *)dest;
874 src_port = src_in6->sin6_port;
875 dest_port = dest_in6->sin6_port;
876 ip_hdr_len = sizeof(ip->v6);
877 break;
878 #endif
879 default:
880 return NULL;
881 }
882
883 switch (socket_type) {
884 case SOCK_STREAM:
885 protocol = 0x06; /* TCP */
886 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
887 wire_len = wire_hdr_len + payload_len;
888 break;
889
890 case SOCK_DGRAM:
891 protocol = 0x11; /* UDP */
892 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
893 wire_len = wire_hdr_len + payload_len;
894 break;
895
896 default:
897 return NULL;
898 }
899
900 if (unreachable) {
901 icmp_protocol = protocol;
902 switch (src->sa_family) {
903 case AF_INET:
904 protocol = 0x01; /* ICMPv4 */
905 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
906 break;
907 #ifdef HAVE_IPV6
908 case AF_INET6:
909 protocol = 0x3A; /* ICMPv6 */
910 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
911 break;
912 #endif
913 }
914 if (wire_len > 64 ) {
915 icmp_truncate_len = wire_len - 64;
916 }
917 wire_hdr_len += icmp_hdr_len;
918 wire_len += icmp_hdr_len;
919 }
920
921 packet_len = nonwire_len + wire_len;
922 alloc_len = packet_len;
923 if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
924 alloc_len = SWRAP_PACKET_MIN_ALLOC;
925 }
926
927 base = (uint8_t *)malloc(alloc_len);
928 if (!base) return NULL;
929
930 buf = base;
931
932 frame = (struct swrap_packet_frame *)buf;
933 frame->seconds = tval->tv_sec;
934 frame->micro_seconds = tval->tv_usec;
935 frame->recorded_length = wire_len - icmp_truncate_len;
936 frame->full_length = wire_len - icmp_truncate_len;
937 buf += SWRAP_PACKET_FRAME_SIZE;
938
939 ip = (union swrap_packet_ip *)buf;
940 switch (src->sa_family) {
941 case AF_INET:
942 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
943 ip->v4.tos = 0x00;
944 ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
945 ip->v4.identification = htons(0xFFFF);
946 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
947 ip->v4.fragment = htons(0x0000);
948 ip->v4.ttl = 0xFF;
949 ip->v4.protocol = protocol;
950 ip->v4.hdr_checksum = htons(0x0000);
951 ip->v4.src_addr = src_in->sin_addr.s_addr;
952 ip->v4.dest_addr = dest_in->sin_addr.s_addr;
953 buf += SWRAP_PACKET_IP_V4_SIZE;
954 break;
955 #ifdef HAVE_IPV6
956 case AF_INET6:
957 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
958 ip->v6.flow_label_high = 0x00;
959 ip->v6.flow_label_low = 0x0000;
960 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
961 ip->v6.next_header = protocol;
962 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
963 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
964 buf += SWRAP_PACKET_IP_V6_SIZE;
965 break;
966 #endif
967 }
968
969 if (unreachable) {
970 pay = (union swrap_packet_payload *)buf;
971 switch (src->sa_family) {
972 case AF_INET:
973 pay->icmp4.type = 0x03; /* destination unreachable */
974 pay->icmp4.code = 0x01; /* host unreachable */
975 pay->icmp4.checksum = htons(0x0000);
976 pay->icmp4.unused = htonl(0x00000000);
977 buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
978
979 /* set the ip header in the ICMP payload */
980 ip = (union swrap_packet_ip *)buf;
981 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
982 ip->v4.tos = 0x00;
983 ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
984 ip->v4.identification = htons(0xFFFF);
985 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
986 ip->v4.fragment = htons(0x0000);
987 ip->v4.ttl = 0xFF;
988 ip->v4.protocol = icmp_protocol;
989 ip->v4.hdr_checksum = htons(0x0000);
990 ip->v4.src_addr = dest_in->sin_addr.s_addr;
991 ip->v4.dest_addr = src_in->sin_addr.s_addr;
992 buf += SWRAP_PACKET_IP_V4_SIZE;
993
994 src_port = dest_in->sin_port;
995 dest_port = src_in->sin_port;
996 break;
997 #ifdef HAVE_IPV6
998 case AF_INET6:
999 pay->icmp6.type = 0x01; /* destination unreachable */
1000 pay->icmp6.code = 0x03; /* address unreachable */
1001 pay->icmp6.checksum = htons(0x0000);
1002 pay->icmp6.unused = htonl(0x00000000);
1003 buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
1004
1005 /* set the ip header in the ICMP payload */
1006 ip = (union swrap_packet_ip *)buf;
1007 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
1008 ip->v6.flow_label_high = 0x00;
1009 ip->v6.flow_label_low = 0x0000;
1010 ip->v6.payload_length = htons(wire_len - icmp_truncate_len);//TODO
1011 ip->v6.next_header = protocol;
1012 memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
1013 memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
1014 buf += SWRAP_PACKET_IP_V6_SIZE;
1015
1016 src_port = dest_in6->sin6_port;
1017 dest_port = src_in6->sin6_port;
1018 break;
1019 #endif
1020 }
1021 }
1022
1023 pay = (union swrap_packet_payload *)buf;
1024
1025 switch (socket_type) {
1026 case SOCK_STREAM:
1027 pay->tcp.source_port = src_port;
1028 pay->tcp.dest_port = dest_port;
1029 pay->tcp.seq_num = htonl(tcp_seqno);
1030 pay->tcp.ack_num = htonl(tcp_ack);
1031 pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
1032 pay->tcp.control = tcp_ctl;
1033 pay->tcp.window = htons(0x7FFF);
1034 pay->tcp.checksum = htons(0x0000);
1035 pay->tcp.urg = htons(0x0000);
1036 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
1037
1038 break;
1039
1040 case SOCK_DGRAM:
1041 pay->udp.source_port = src_port;
1042 pay->udp.dest_port = dest_port;
1043 pay->udp.length = htons(8 + payload_len);
1044 pay->udp.checksum = htons(0x0000);
1045 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
1046
1047 break;
1048 }
1049
1050 if (payload && payload_len > 0) {
1051 memcpy(buf, payload, payload_len);
1052 }
1053
1054 *_packet_len = packet_len - icmp_truncate_len;
1055 return base;
1056 }
1057
1058 static int swrap_get_pcap_fd(const char *fname)
1059 {
1060 static int fd = -1;
1061
1062 if (fd != -1) return fd;
1063
1064 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1065 if (fd != -1) {
1066 struct swrap_file_hdr file_hdr;
1067 file_hdr.magic = 0xA1B2C3D4;
1068 file_hdr.version_major = 0x0002;
1069 file_hdr.version_minor = 0x0004;
1070 file_hdr.timezone = 0x00000000;
1071 file_hdr.sigfigs = 0x00000000;
1072 file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
1073 file_hdr.link_type = 0x0065; /* 101 RAW IP */
1074
1075 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1076 close(fd);
1077 fd = -1;
1078 }
1079 return fd;
1080 }
1081
1082 fd = open(fname, O_WRONLY|O_APPEND, 0644);
1083
1084 return fd;
1085 }
1086
1087 static uint8_t *swrap_marshall_packet(struct socket_info *si,
1088 const struct sockaddr *addr,
1089 enum swrap_packet_type type,
1090 const void *buf, size_t len,
1091 size_t *packet_len)
1092 {
1093 const struct sockaddr *src_addr;
1094 const struct sockaddr *dest_addr;
1095 unsigned long tcp_seqno = 0;
1096 unsigned long tcp_ack = 0;
1097 unsigned char tcp_ctl = 0;
1098 int unreachable = 0;
1099
1100 struct timeval tv;
1101
1102 switch (si->family) {
1103 case AF_INET:
1104 break;
1105 case AF_INET6:
1106 break;
1107 default:
1108 return NULL;
1109 }
1110
1111 switch (type) {
1112 case SWRAP_CONNECT_SEND:
1113 if (si->type != SOCK_STREAM) return NULL;
1114
1115 src_addr = si->myname;
1116 dest_addr = addr;
1117
1118 tcp_seqno = si->io.pck_snd;
1119 tcp_ack = si->io.pck_rcv;
1120 tcp_ctl = 0x02; /* SYN */
1121
1122 si->io.pck_snd += 1;
1123
1124 break;
1125
1126 case SWRAP_CONNECT_RECV:
1127 if (si->type != SOCK_STREAM) return NULL;
1128
1129 dest_addr = si->myname;
1130 src_addr = addr;
1131
1132 tcp_seqno = si->io.pck_rcv;
1133 tcp_ack = si->io.pck_snd;
1134 tcp_ctl = 0x12; /** SYN,ACK */
1135
1136 si->io.pck_rcv += 1;
1137
1138 break;
1139
1140 case SWRAP_CONNECT_UNREACH:
1141 if (si->type != SOCK_STREAM) return NULL;
1142
1143 dest_addr = si->myname;
1144 src_addr = addr;
1145
1146 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
1147 tcp_seqno = si->io.pck_snd - 1;
1148 tcp_ack = si->io.pck_rcv;
1149 tcp_ctl = 0x02; /* SYN */
1150 unreachable = 1;
1151
1152 break;
1153
1154 case SWRAP_CONNECT_ACK:
1155 if (si->type != SOCK_STREAM) return NULL;
1156
1157 src_addr = si->myname;
1158 dest_addr = addr;
1159
1160 tcp_seqno = si->io.pck_snd;
1161 tcp_ack = si->io.pck_rcv;
1162 tcp_ctl = 0x10; /* ACK */
1163
1164 break;
1165
1166 case SWRAP_ACCEPT_SEND:
1167 if (si->type != SOCK_STREAM) return NULL;
1168
1169 dest_addr = si->myname;
1170 src_addr = addr;
1171
1172 tcp_seqno = si->io.pck_rcv;
1173 tcp_ack = si->io.pck_snd;
1174 tcp_ctl = 0x02; /* SYN */
1175
1176 si->io.pck_rcv += 1;
1177
1178 break;
1179
1180 case SWRAP_ACCEPT_RECV:
1181 if (si->type != SOCK_STREAM) return NULL;
1182
1183 src_addr = si->myname;
1184 dest_addr = addr;
1185
1186 tcp_seqno = si->io.pck_snd;
1187 tcp_ack = si->io.pck_rcv;
1188 tcp_ctl = 0x12; /* SYN,ACK */
1189
1190 si->io.pck_snd += 1;
1191
1192 break;
1193
1194 case SWRAP_ACCEPT_ACK:
1195 if (si->type != SOCK_STREAM) return NULL;
1196
1197 dest_addr = si->myname;
1198 src_addr = addr;
1199
1200 tcp_seqno = si->io.pck_rcv;
1201 tcp_ack = si->io.pck_snd;
1202 tcp_ctl = 0x10; /* ACK */
1203
1204 break;
1205
1206 case SWRAP_SEND:
1207 src_addr = si->myname;
1208 dest_addr = si->peername;
1209
1210 tcp_seqno = si->io.pck_snd;
1211 tcp_ack = si->io.pck_rcv;
1212 tcp_ctl = 0x18; /* PSH,ACK */
1213
1214 si->io.pck_snd += len;
1215
1216 break;
1217
1218 case SWRAP_SEND_RST:
1219 dest_addr = si->myname;
1220 src_addr = si->peername;
1221
1222 if (si->type == SOCK_DGRAM) {
1223 return swrap_marshall_packet(si, si->peername,
1224 SWRAP_SENDTO_UNREACH,
1225 buf, len, packet_len);
1226 }
1227
1228 tcp_seqno = si->io.pck_rcv;
1229 tcp_ack = si->io.pck_snd;
1230 tcp_ctl = 0x14; /** RST,ACK */
1231
1232 break;
1233
1234 case SWRAP_PENDING_RST:
1235 dest_addr = si->myname;
1236 src_addr = si->peername;
1237
1238 if (si->type == SOCK_DGRAM) {
1239 return NULL;
1240 }
1241
1242 tcp_seqno = si->io.pck_rcv;
1243 tcp_ack = si->io.pck_snd;
1244 tcp_ctl = 0x14; /* RST,ACK */
1245
1246 break;
1247
1248 case SWRAP_RECV:
1249 dest_addr = si->myname;
1250 src_addr = si->peername;
1251
1252 tcp_seqno = si->io.pck_rcv;
1253 tcp_ack = si->io.pck_snd;
1254 tcp_ctl = 0x18; /* PSH,ACK */
1255
1256 si->io.pck_rcv += len;
1257
1258 break;
1259
1260 case SWRAP_RECV_RST:
1261 dest_addr = si->myname;
1262 src_addr = si->peername;
1263
1264 if (si->type == SOCK_DGRAM) {
1265 return NULL;
1266 }
1267
1268 tcp_seqno = si->io.pck_rcv;
1269 tcp_ack = si->io.pck_snd;
1270 tcp_ctl = 0x14; /* RST,ACK */
1271
1272 break;
1273
1274 case SWRAP_SENDTO:
1275 src_addr = si->myname;
1276 dest_addr = addr;
1277
1278 si->io.pck_snd += len;
1279
1280 break;
1281
1282 case SWRAP_SENDTO_UNREACH:
1283 dest_addr = si->myname;
1284 src_addr = addr;
1285
1286 unreachable = 1;
1287
1288 break;
1289
1290 case SWRAP_RECVFROM:
1291 dest_addr = si->myname;
1292 src_addr = addr;
1293
1294 si->io.pck_rcv += len;
1295
1296 break;
1297
1298 case SWRAP_CLOSE_SEND:
1299 if (si->type != SOCK_STREAM) return NULL;
1300
1301 src_addr = si->myname;
1302 dest_addr = si->peername;
1303
1304 tcp_seqno = si->io.pck_snd;
1305 tcp_ack = si->io.pck_rcv;
1306 tcp_ctl = 0x11; /* FIN, ACK */
1307
1308 si->io.pck_snd += 1;
1309
1310 break;
1311
1312 case SWRAP_CLOSE_RECV:
1313 if (si->type != SOCK_STREAM) return NULL;
1314
1315 dest_addr = si->myname;
1316 src_addr = si->peername;
1317
1318 tcp_seqno = si->io.pck_rcv;
1319 tcp_ack = si->io.pck_snd;
1320 tcp_ctl = 0x11; /* FIN,ACK */
1321
1322 si->io.pck_rcv += 1;
1323
1324 break;
1325
1326 case SWRAP_CLOSE_ACK:
1327 if (si->type != SOCK_STREAM) return NULL;
1328
1329 src_addr = si->myname;
1330 dest_addr = si->peername;
1331
1332 tcp_seqno = si->io.pck_snd;
1333 tcp_ack = si->io.pck_rcv;
1334 tcp_ctl = 0x10; /* ACK */
1335
1336 break;
1337 default:
1338 return NULL;
1339 }
1340
1341 swrapGetTimeOfDay(&tv);
1342
1343 return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1344 (const uint8_t *)buf, len,
1345 tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1346 packet_len);
1347 }
1348
1349 static void swrap_dump_packet(struct socket_info *si,
1350 const struct sockaddr *addr,
1351 enum swrap_packet_type type,
1352 const void *buf, size_t len)
1353 {
1354 const char *file_name;
1355 uint8_t *packet;
1356 size_t packet_len = 0;
1357 int fd;
1358
1359 file_name = socket_wrapper_pcap_file();
1360 if (!file_name) {
1361 return;
1362 }
1363
1364 packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1365 if (!packet) {
1366 return;
1367 }
1368
1369 fd = swrap_get_pcap_fd(file_name);
1370 if (fd != -1) {
1371 if (write(fd, packet, packet_len) != packet_len) {
1372 free(packet);
1373 return;
1374 }
1375 }
1376
1377 free(packet);
1378 }
1379
1380 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
1381 {
1382 struct socket_info *si;
1383 int fd;
1384
1385 if (!socket_wrapper_dir()) {
1386 return real_socket(family, type, protocol);
1387 }
1388
1389 switch (family) {
1390 case AF_INET:
1391 #ifdef HAVE_IPV6
1392 case AF_INET6:
1393 #endif
1394 break;
1395 case AF_UNIX:
1396 return real_socket(family, type, protocol);
1397 default:
1398 errno = EAFNOSUPPORT;
1399 return -1;
1400 }
1401
1402 switch (type) {
1403 case SOCK_STREAM:
1404 break;
1405 case SOCK_DGRAM:
1406 break;
1407 default:
1408 errno = EPROTONOSUPPORT;
1409 return -1;
1410 }
1411
1412 switch (protocol) {
1413 case 0:
1414 break;
1415 case 6:
1416 if (type == SOCK_STREAM) {
1417 break;
1418 }
1419 /*fall through*/
1420 case 17:
1421 if (type == SOCK_DGRAM) {
1422 break;
1423 }
1424 /*fall through*/
1425 default:
1426 errno = EPROTONOSUPPORT;
1427 return -1;
1428 }
1429
1430 fd = real_socket(AF_UNIX, type, 0);
1431
1432 if (fd == -1) return -1;
1433
1434 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1435
1436 si->family = family;
1437 si->type = type;
1438 si->protocol = protocol;
1439 si->fd = fd;
1440
1441 SWRAP_DLIST_ADD(sockets, si);
1442
1443 return si->fd;
1444 }
1445
1446 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1447 {
1448 struct socket_info *parent_si, *child_si;
1449 int fd;
1450 struct sockaddr_un un_addr;
1451 socklen_t un_addrlen = sizeof(un_addr);
1452 struct sockaddr_un un_my_addr;
1453 socklen_t un_my_addrlen = sizeof(un_my_addr);
1454 struct sockaddr *my_addr;
1455 socklen_t my_addrlen, len;
1456 int ret;
1457
1458 parent_si = find_socket_info(s);
1459 if (!parent_si) {
1460 return real_accept(s, addr, addrlen);
1461 }
1462
1463 /*
1464 * assume out sockaddr have the same size as the in parent
1465 * socket family
1466 */
1467 my_addrlen = socket_length(parent_si->family);
1468 if (my_addrlen <= 0) {
1469 errno = EINVAL;
1470 return -1;
1471 }
1472
1473 my_addr = (struct sockaddr *)malloc(my_addrlen);
1474 if (my_addr == NULL) {
1475 return -1;
1476 }
1477
1478 memset(&un_addr, 0, sizeof(un_addr));
1479 memset(&un_my_addr, 0, sizeof(un_my_addr));
1480
1481 ret = real_accept(s, (struct sockaddr *)&un_addr, &un_addrlen);
1482 if (ret == -1) {
1483 free(my_addr);
1484 return ret;
1485 }
1486
1487 fd = ret;
1488
1489 len = my_addrlen;
1490 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1491 parent_si->family, my_addr, &len);
1492 if (ret == -1) {
1493 free(my_addr);
1494 close(fd);
1495 return ret;
1496 }
1497
1498 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1499 memset(child_si, 0, sizeof(*child_si));
1500
1501 child_si->fd = fd;
1502 child_si->family = parent_si->family;
1503 child_si->type = parent_si->type;
1504 child_si->protocol = parent_si->protocol;
1505 child_si->bound = 1;
1506 child_si->is_server = 1;
1507 child_si->connected = 1;
1508
1509 child_si->peername_len = len;
1510 child_si->peername = sockaddr_dup(my_addr, len);
1511
1512 if (addr != NULL && addrlen != NULL) {
1513 *addrlen = len;
1514 if (*addrlen >= len)
1515 memcpy(addr, my_addr, len);
1516 *addrlen = 0;
1517 }
1518
1519 ret = real_getsockname(fd, (struct sockaddr *)&un_my_addr, &un_my_addrlen);
1520 if (ret == -1) {
1521 free(child_si);
1522 close(fd);
1523 return ret;
1524 }
1525
1526 len = my_addrlen;
1527 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1528 child_si->family, my_addr, &len);
1529 if (ret == -1) {
1530 free(child_si);
1531 free(my_addr);
1532 close(fd);
1533 return ret;
1534 }
1535
1536 child_si->myname_len = len;
1537 child_si->myname = sockaddr_dup(my_addr, len);
1538 free(my_addr);
1539
1540 SWRAP_DLIST_ADD(sockets, child_si);
1541
1542 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1543 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1544 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1545
1546 return fd;
1547 }
1548
1549 static int autobind_start_init;
1550 static int autobind_start;
1551
1552 /* using sendto() or connect() on an unbound socket would give the
1553 recipient no way to reply, as unlike UDP and TCP, a unix domain
1554 socket can't auto-assign emphemeral port numbers, so we need to
1555 assign it here.
1556 Note: this might change the family from ipv6 to ipv4
1557 */
1558 static int swrap_auto_bind(struct socket_info *si, int family)
1559 {
1560 struct sockaddr_un un_addr;
1561 int i;
1562 char type;
1563 int ret;
1564 int port;
1565 struct stat st;
1566
1567 if (autobind_start_init != 1) {
1568 autobind_start_init = 1;
1569 autobind_start = getpid();
1570 autobind_start %= 50000;
1571 autobind_start += 10000;
1572 }
1573
1574 un_addr.sun_family = AF_UNIX;
1575
1576 switch (family) {
1577 case AF_INET: {
1578 struct sockaddr_in in;
1579
1580 switch (si->type) {
1581 case SOCK_STREAM:
1582 type = SOCKET_TYPE_CHAR_TCP;
1583 break;
1584 case SOCK_DGRAM:
1585 type = SOCKET_TYPE_CHAR_UDP;
1586 break;
1587 default:
1588 errno = ESOCKTNOSUPPORT;
1589 return -1;
1590 }
1591
1592 memset(&in, 0, sizeof(in));
1593 in.sin_family = AF_INET;
1594 in.sin_addr.s_addr = htonl(127<<24 |
1595 socket_wrapper_default_iface());
1596
1597 si->myname_len = sizeof(in);
1598 si->myname = sockaddr_dup(&in, si->myname_len);
1599 break;
1600 }
1601 #ifdef HAVE_IPV6
1602 case AF_INET6: {
1603 struct sockaddr_in6 in6;
1604
1605 if (si->family != family) {
1606 errno = ENETUNREACH;
1607 return -1;
1608 }
1609
1610 switch (si->type) {
1611 case SOCK_STREAM:
1612 type = SOCKET_TYPE_CHAR_TCP_V6;
1613 break;
1614 case SOCK_DGRAM:
1615 type = SOCKET_TYPE_CHAR_UDP_V6;
1616 break;
1617 default:
1618 errno = ESOCKTNOSUPPORT;
1619 return -1;
1620 }
1621
1622 memset(&in6, 0, sizeof(in6));
1623 in6.sin6_family = AF_INET6;
1624 in6.sin6_addr = *swrap_ipv6();
1625 in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
1626 si->myname_len = sizeof(in6);
1627 si->myname = sockaddr_dup(&in6, si->myname_len);
1628 break;
1629 }
1630 #endif
1631 default:
1632 errno = ESOCKTNOSUPPORT;
1633 return -1;
1634 }
1635
1636 if (autobind_start > 60000) {
1637 autobind_start = 10000;
1638 }
1639
1640 for (i=0;i<1000;i++) {
1641 port = autobind_start + i;
1642 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1643 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1644 type, socket_wrapper_default_iface(), port);
1645 if (stat(un_addr.sun_path, &st) == 0) continue;
1646
1647 ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
1648 if (ret == -1) return ret;
1649
1650 si->tmp_path = strdup(un_addr.sun_path);
1651 si->bound = 1;
1652 autobind_start = port + 1;
1653 break;
1654 }
1655 if (i == 1000) {
1656 errno = ENFILE;
1657 return -1;
1658 }
1659
1660 si->family = family;
1661 set_port(si->family, port, si->myname);
1662
1663 return 0;
1664 }
1665
1666
1667 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1668 {
1669 int ret;
1670 struct sockaddr_un un_addr;
1671 struct socket_info *si = find_socket_info(s);
1672
1673 if (!si) {
1674 return real_connect(s, serv_addr, addrlen);
1675 }
1676
1677 if (si->bound == 0) {
1678 ret = swrap_auto_bind(si, serv_addr->sa_family);
1679 if (ret == -1) return -1;
1680 }
1681
1682 if (si->family != serv_addr->sa_family) {
1683 errno = EINVAL;
1684 return -1;
1685 }
1686
1687 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
1688 if (ret == -1) return -1;
1689
1690 if (si->type == SOCK_DGRAM) {
1691 si->defer_connect = 1;
1692 ret = 0;
1693 } else {
1694 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1695
1696 ret = real_connect(s, (struct sockaddr *)&un_addr,
1697 sizeof(struct sockaddr_un));
1698 }
1699
1700 /* to give better errors */
1701 if (ret == -1 && errno == ENOENT) {
1702 errno = EHOSTUNREACH;
1703 }
1704
1705 if (ret == 0) {
1706 si->peername_len = addrlen;
1707 si->peername = sockaddr_dup(serv_addr, addrlen);
1708 si->connected = 1;
1709
1710 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1711 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1712 } else {
1713 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1714 }
1715
1716 return ret;
1717 }
1718
1719 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1720 {
1721 int ret;
1722 struct sockaddr_un un_addr;
1723 struct socket_info *si = find_socket_info(s);
1724
1725 if (!si) {
1726 return real_bind(s, myaddr, addrlen);
1727 }
1728
1729 si->myname_len = addrlen;
1730 si->myname = sockaddr_dup(myaddr, addrlen);
1731
1732 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
1733 if (ret == -1) return -1;
1734
1735 unlink(un_addr.sun_path);
1736
1737 ret = real_bind(s, (struct sockaddr *)&un_addr,
1738 sizeof(struct sockaddr_un));
1739
1740 if (ret == 0) {
1741 si->bound = 1;
1742 }
1743
1744 return ret;
1745 }
1746
1747 _PUBLIC_ int swrap_listen(int s, int backlog)
1748 {
1749 int ret;
1750 struct socket_info *si = find_socket_info(s);
1751
1752 if (!si) {
1753 return real_listen(s, backlog);
1754 }
1755
1756 ret = real_listen(s, backlog);
1757
1758 return ret;
1759 }
1760
1761 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1762 {
1763 struct socket_info *si = find_socket_info(s);
1764
1765 if (!si) {
1766 return real_getpeername(s, name, addrlen);
1767 }
1768
1769 if (!si->peername)
1770 {
1771 errno = ENOTCONN;
1772 return -1;
1773 }
1774
1775 memcpy(name, si->peername, si->peername_len);
1776 *addrlen = si->peername_len;
1777
1778 return 0;
1779 }
1780
1781 _PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1782 {
1783 struct socket_info *si = find_socket_info(s);
1784
1785 if (!si) {
1786 return real_getsockname(s, name, addrlen);
1787 }
1788
1789 memcpy(name, si->myname, si->myname_len);
1790 *addrlen = si->myname_len;
1791
1792 return 0;
1793 }
1794
1795 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1796 {
1797 struct socket_info *si = find_socket_info(s);
1798
1799 if (!si) {
1800 return real_getsockopt(s, level, optname, optval, optlen);
1801 }
1802
1803 if (level == SOL_SOCKET) {
1804 return real_getsockopt(s, level, optname, optval, optlen);
1805 }
1806
1807 errno = ENOPROTOOPT;
1808 return -1;
1809 }
1810
1811 _PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1812 {
1813 struct socket_info *si = find_socket_info(s);
1814
1815 if (!si) {
1816 return real_setsockopt(s, level, optname, optval, optlen);
1817 }
1818
1819 if (level == SOL_SOCKET) {
1820 return real_setsockopt(s, level, optname, optval, optlen);
1821 }
1822
1823 switch (si->family) {
1824 case AF_INET:
1825 return 0;
1826 default:
1827 errno = ENOPROTOOPT;
1828 return -1;
1829 }
1830 }
1831
1832 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
1833 {
1834 struct sockaddr_un un_addr;
1835 socklen_t un_addrlen = sizeof(un_addr);
1836 int ret;
1837 struct socket_info *si = find_socket_info(s);
1838 struct sockaddr_storage ss;
1839 socklen_t ss_len = sizeof(ss);
1840
1841 if (!si) {
1842 return real_recvfrom(s, buf, len, flags, from, fromlen);
1843 }
1844
1845 if (!from) {
1846 from = (struct sockaddr *)&ss;
1847 fromlen = &ss_len;
1848 }
1849
1850 len = MIN(len, 1500);
1851
1852 /* irix 6.4 forgets to null terminate the sun_path string :-( */
1853 memset(&un_addr, 0, sizeof(un_addr));
1854 ret = real_recvfrom(s, buf, len, flags, (struct sockaddr *)&un_addr, &un_addrlen);
1855 if (ret == -1)
1856 return ret;
1857
1858 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
1859 si->family, from, fromlen) == -1) {
1860 return -1;
1861 }
1862
1863 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
1864
1865 return ret;
1866 }
1867
1868
1869 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
1870 {
1871 struct sockaddr_un un_addr;
1872 int ret;
1873 struct socket_info *si = find_socket_info(s);
1874 int bcast = 0;
1875
1876 if (!si) {
1877 return real_sendto(s, buf, len, flags, to, tolen);
1878 }
1879
1880 if (si->connected) {
1881 if (to) {
1882 errno = EISCONN;
1883 return -1;
1884 }
1885
1886 to = si->peername;
1887 tolen = si->peername_len;
1888 }
1889
1890 len = MIN(len, 1500);
1891
1892 switch (si->type) {
1893 case SOCK_STREAM:
1894 ret = real_send(s, buf, len, flags);
1895 break;
1896 case SOCK_DGRAM:
1897 if (si->bound == 0) {
1898 ret = swrap_auto_bind(si, si->family);
1899 if (ret == -1) return -1;
1900 }
1901
1902 ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
1903 if (ret == -1) return -1;
1904
1905 if (bcast) {
1906 struct stat st;
1907 unsigned int iface;
1908 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
1909 char type;
1910
1911 type = SOCKET_TYPE_CHAR_UDP;
1912
1913 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
1914 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
1915 socket_wrapper_dir(), type, iface, prt);
1916 if (stat(un_addr.sun_path, &st) != 0) continue;
1917
1918 /* ignore the any errors in broadcast sends */
1919 real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1920 }
1921
1922 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1923
1924 return len;
1925 }
1926
1927 if (si->defer_connect) {
1928 ret = real_connect(s, (struct sockaddr *)&un_addr,
1929 sizeof(un_addr));
1930
1931 /* to give better errors */
1932 if (ret == -1 && errno == ENOENT) {
1933 errno = EHOSTUNREACH;
1934 }
1935
1936 if (ret == -1) {
1937 return ret;
1938 }
1939 si->defer_connect = 0;
1940 }
1941
1942 ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1943 break;
1944 default:
1945 ret = -1;
1946 errno = EHOSTUNREACH;
1947 break;
1948 }
1949
1950 /* to give better errors */
1951 if (ret == -1 && errno == ENOENT) {
1952 errno = EHOSTUNREACH;
1953 }
1954
1955 if (ret == -1) {
1956 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1957 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
1958 } else {
1959 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, ret);
1960 }
1961
1962 return ret;
1963 }
1964
1965 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1966 {
1967 int ret;
1968 struct socket_info *si = find_socket_info(s);
1969 int value;
1970
1971 if (!si) {
1972 return real_ioctl(s, r, p);
1973 }
1974
1975 ret = real_ioctl(s, r, p);
1976
1977 switch (r) {
1978 case FIONREAD:
1979 value = *((int *)p);
1980 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1981 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1982 } else if (value == 0) { /* END OF FILE */
1983 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1984 }
1985 break;
1986 }
1987
1988 return ret;
1989 }
1990
1991 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
1992 {
1993 int ret;
1994 struct socket_info *si = find_socket_info(s);
1995
1996 if (!si) {
1997 return real_recv(s, buf, len, flags);
1998 }
1999
2000 len = MIN(len, 1500);
2001
2002 ret = real_recv(s, buf, len, flags);
2003 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2004 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2005 } else if (ret == 0) { /* END OF FILE */
2006 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2007 } else if (ret > 0) {
2008 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2009 }
2010
2011 return ret;
2012 }
2013
2014
2015 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
2016 {
2017 int ret;
2018 struct socket_info *si = find_socket_info(s);
2019
2020 if (!si) {
2021 return real_send(s, buf, len, flags);
2022 }
2023
2024 len = MIN(len, 1500);
2025
2026 if (si->defer_connect) {
2027 struct sockaddr_un un_addr;
2028 int bcast = 0;
2029
2030 if (si->bound == 0) {
2031 ret = swrap_auto_bind(si, si->family);
2032 if (ret == -1) return -1;
2033 }
2034
2035 ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
2036 &un_addr, 0, &bcast);
2037 if (ret == -1) return -1;
2038
2039 ret = real_connect(s, (struct sockaddr *)&un_addr,
2040 sizeof(un_addr));
2041
2042 /* to give better errors */
2043 if (ret == -1 && errno == ENOENT) {
2044 errno = EHOSTUNREACH;
2045 }
2046
2047 if (ret == -1) {
2048 return ret;
2049 }
2050 si->defer_connect = 0;
2051 }
2052
2053 ret = real_send(s, buf, len, flags);
2054
2055 if (ret == -1) {
2056 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2057 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2058 } else {
2059 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
2060 }
2061
2062 return ret;
2063 }
2064
2065 int swrap_readv(int s, const struct iovec *vector, size_t count)
2066 {
2067 int ret;
2068 struct socket_info *si = find_socket_info(s);
2069 struct iovec v;
2070
2071 if (!si) {
2072 return real_readv(s, vector, count);
2073 }
2074
2075 /* we read 1500 bytes as maximum */
2076 if (count > 0) {
2077 size_t i, len = 0;
2078
2079 for (i=0; i < count; i++) {
2080 size_t nlen;
2081 nlen = len + vector[i].iov_len;
2082 if (nlen > 1500) {
2083 break;
2084 }
2085 }
2086 count = i;
2087 if (count == 0) {
2088 v = vector[0];
2089 v.iov_len = MIN(v.iov_len, 1500);
2090 vector = &v;
2091 count = 1;
2092 }
2093 }
2094
2095 ret = real_readv(s, vector, count);
2096 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2097 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2098 } else if (ret == 0) { /* END OF FILE */
2099 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2100 } else if (ret > 0) {
2101 uint8_t *buf;
2102 off_t ofs = 0;
2103 size_t i;
2104
2105 /* we capture it as one single packet */
2106 buf = (uint8_t *)malloc(ret);
2107 if (!buf) {
2108 /* we just not capture the packet */
2109 errno = 0;
2110 return ret;
2111 }
2112
2113 for (i=0; i < count; i++) {
2114 memcpy(buf + ofs,
2115 vector[i].iov_base,
2116 vector[i].iov_len);
2117 ofs += vector[i].iov_len;
2118 }
2119
2120 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2121 free(buf);
2122 }
2123
2124 return ret;
2125 }
2126
2127 int swrap_writev(int s, const struct iovec *vector, size_t count)
2128 {
2129 int ret;
2130 struct socket_info *si = find_socket_info(s);
2131 struct iovec v;
2132
2133 if (!si) {
2134 return real_writev(s, vector, count);
2135 }
2136
2137 /* we write 1500 bytes as maximum */
2138 if (count > 0) {
2139 size_t i, len = 0;
2140
2141 for (i=0; i < count; i++) {
2142 size_t nlen;
2143 nlen = len + vector[i].iov_len;
2144 if (nlen > 1500) {
2145 break;
2146 }
2147 }
2148 count = i;
2149 if (count == 0) {
2150 v = vector[0];
2151 v.iov_len = MIN(v.iov_len, 1500);
2152 vector = &v;
2153 count = 1;
2154 }
2155 }
2156
2157 ret = real_writev(s, vector, count);
2158 if (ret == -1) {
2159 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2160 } else {
2161 uint8_t *buf;
2162 off_t ofs = 0;
2163 size_t i;
2164
2165 /* we capture it as one single packet */
2166 buf = (uint8_t *)malloc(ret);
2167 if (!buf) {
2168 /* we just not capture the packet */
2169 errno = 0;
2170 return ret;
2171 }
2172
2173 for (i=0; i < count; i++) {
2174 memcpy(buf + ofs,
2175 vector[i].iov_base,
2176 vector[i].iov_len);
2177 ofs += vector[i].iov_len;
2178 }
2179
2180 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
2181 free(buf);
2182 }
2183
2184 return ret;
2185 }
2186
2187 _PUBLIC_ int swrap_close(int fd)
2188 {
2189 struct socket_info *si = find_socket_info(fd);
2190 int ret;
2191
2192 if (!si) {
2193 return real_close(fd);
2194 }
2195
2196 SWRAP_DLIST_REMOVE(sockets, si);
2197
2198 if (si->myname && si->peername) {
2199 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
2200 }
2201
2202 ret = real_close(fd);
2203
2204 if (si->myname && si->peername) {
2205 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
2206 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
2207 }
2208
2209 if (si->path) free(si->path);
2210 if (si->myname) free(si->myname);
2211 if (si->peername) free(si->peername);
2212 if (si->tmp_path) {
2213 unlink(si->tmp_path);
2214 free(si->tmp_path);
2215 }
2216 free(si);
2217
2218 return ret;
2219 }