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s3-param Make lp_ncalrpc_dir() const
[Samba.git] / lib / socket_wrapper / socket_wrapper.c
blobd70459ba0871e424fff9fef24a83181c5601c416
1 /*
2 * Copyright (C) Jelmer Vernooij 2005,2008 <jelmer@samba.org>
3 * Copyright (C) Stefan Metzmacher 2006-2009 <metze@samba.org>
4 *
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * 3. Neither the name of the author nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 */
35
36 /*
37 Socket wrapper library. Passes all socket communication over
38 unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
39 is set.
40 */
41
42 #ifdef _SAMBA_BUILD_
43
44 #define SOCKET_WRAPPER_NOT_REPLACE
45 #include "../replace/replace.h"
46 #include "system/network.h"
47 #include "system/filesys.h"
48 #include "system/time.h"
49
50 #else /* _SAMBA_BUILD_ */
51
52 #include <sys/types.h>
53 #include <sys/time.h>
54 #include <sys/stat.h>
55 #include <sys/socket.h>
56 #include <sys/ioctl.h>
57 #include <sys/filio.h>
58 #include <errno.h>
59 #include <sys/un.h>
60 #include <netinet/in.h>
61 #include <netinet/tcp.h>
62 #include <fcntl.h>
63 #include <stdlib.h>
64 #include <unistd.h>
65 #include <string.h>
66 #include <stdio.h>
67 #include <stdint.h>
68
69 #endif
70
71 #ifndef _PUBLIC_
72 #define _PUBLIC_
73 #endif
74
75 #define SWRAP_DLIST_ADD(list,item) do { \
76 if (!(list)) { \
77 (item)->prev = NULL; \
78 (item)->next = NULL; \
79 (list) = (item); \
80 } else { \
81 (item)->prev = NULL; \
82 (item)->next = (list); \
83 (list)->prev = (item); \
84 (list) = (item); \
85 } \
86 } while (0)
87
88 #define SWRAP_DLIST_REMOVE(list,item) do { \
89 if ((list) == (item)) { \
90 (list) = (item)->next; \
91 if (list) { \
92 (list)->prev = NULL; \
93 } \
94 } else { \
95 if ((item)->prev) { \
96 (item)->prev->next = (item)->next; \
97 } \
98 if ((item)->next) { \
99 (item)->next->prev = (item)->prev; \
100 } \
101 } \
102 (item)->prev = NULL; \
103 (item)->next = NULL; \
104 } while (0)
105
106 /* LD_PRELOAD doesn't work yet, so REWRITE_CALLS is all we support
107 * for now */
108 #define REWRITE_CALLS
109
110 #ifdef REWRITE_CALLS
111 #define real_accept accept
112 #define real_connect connect
113 #define real_bind bind
114 #define real_listen listen
115 #define real_getpeername getpeername
116 #define real_getsockname getsockname
117 #define real_getsockopt getsockopt
118 #define real_setsockopt setsockopt
119 #define real_recvfrom recvfrom
120 #define real_sendto sendto
121 #define real_sendmsg sendmsg
122 #define real_ioctl ioctl
123 #define real_recv recv
124 #define real_read read
125 #define real_send send
126 #define real_readv readv
127 #define real_writev writev
128 #define real_socket socket
129 #define real_close close
130 #endif
131
132 #ifdef HAVE_GETTIMEOFDAY_TZ
133 #define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
134 #else
135 #define swrapGetTimeOfDay(tval) gettimeofday(tval)
136 #endif
137
138 /* we need to use a very terse format here as IRIX 6.4 silently
139 truncates names to 16 chars, so if we use a longer name then we
140 can't tell which port a packet came from with recvfrom()
141
142 with this format we have 8 chars left for the directory name
143 */
144 #define SOCKET_FORMAT "%c%02X%04X"
145 #define SOCKET_TYPE_CHAR_TCP 'T'
146 #define SOCKET_TYPE_CHAR_UDP 'U'
147 #define SOCKET_TYPE_CHAR_TCP_V6 'X'
148 #define SOCKET_TYPE_CHAR_UDP_V6 'Y'
149
150 /* This limit is to avoid broadcast sendto() needing to stat too many
151 * files. It may be raised (with a performance cost) to up to 254
152 * without changing the format above */
153 #define MAX_WRAPPED_INTERFACES 32
154
155 #ifdef HAVE_IPV6
156 /*
157 * FD00::5357:5FXX
158 */
159 static const struct in6_addr *swrap_ipv6(void)
160 {
161 static struct in6_addr v;
162 static int initialized;
163 int ret;
164
165 if (initialized) {
166 return &v;
167 }
168 initialized = 1;
169
170 ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
171 if (ret <= 0) {
172 abort();
173 }
174
175 return &v;
176 }
177 #endif
178
179 static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
180 {
181 struct sockaddr *ret = (struct sockaddr *)malloc(len);
182 memcpy(ret, data, len);
183 return ret;
184 }
185
186 static void set_port(int family, int prt, struct sockaddr *addr)
187 {
188 switch (family) {
189 case AF_INET:
190 ((struct sockaddr_in *)addr)->sin_port = htons(prt);
191 break;
192 #ifdef HAVE_IPV6
193 case AF_INET6:
194 ((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
195 break;
196 #endif
197 }
198 }
199
200 static size_t socket_length(int family)
201 {
202 switch (family) {
203 case AF_INET:
204 return sizeof(struct sockaddr_in);
205 #ifdef HAVE_IPV6
206 case AF_INET6:
207 return sizeof(struct sockaddr_in6);
208 #endif
209 }
210 return 0;
211 }
212
213
214
215 struct socket_info
216 {
217 int fd;
218
219 int family;
220 int type;
221 int protocol;
222 int bound;
223 int bcast;
224 int is_server;
225 int connected;
226 int defer_connect;
227
228 char *path;
229 char *tmp_path;
230
231 struct sockaddr *myname;
232 socklen_t myname_len;
233
234 struct sockaddr *peername;
235 socklen_t peername_len;
236
237 struct {
238 unsigned long pck_snd;
239 unsigned long pck_rcv;
240 } io;
241
242 struct socket_info *prev, *next;
243 };
244
245 static struct socket_info *sockets;
246
247 const char *socket_wrapper_dir(void)
248 {
249 const char *s = getenv("SOCKET_WRAPPER_DIR");
250 if (s == NULL) {
251 return NULL;
252 }
253 if (strncmp(s, "./", 2) == 0) {
254 s += 2;
255 }
256 return s;
257 }
258
259 unsigned int socket_wrapper_default_iface(void)
260 {
261 const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
262 if (s) {
263 unsigned int iface;
264 if (sscanf(s, "%u", &iface) == 1) {
265 if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
266 return iface;
267 }
268 }
269 }
270
271 return 1;/* 127.0.0.1 */
272 }
273
274 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
275 {
276 unsigned int iface;
277 unsigned int prt;
278 const char *p;
279 char type;
280
281 p = strrchr(un->sun_path, '/');
282 if (p) p++; else p = un->sun_path;
283
284 if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
285 errno = EINVAL;
286 return -1;
287 }
288
289 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
290 errno = EINVAL;
291 return -1;
292 }
293
294 if (prt > 0xFFFF) {
295 errno = EINVAL;
296 return -1;
297 }
298
299 switch(type) {
300 case SOCKET_TYPE_CHAR_TCP:
301 case SOCKET_TYPE_CHAR_UDP: {
302 struct sockaddr_in *in2 = (struct sockaddr_in *)(void *)in;
303
304 if ((*len) < sizeof(*in2)) {
305 errno = EINVAL;
306 return -1;
307 }
308
309 memset(in2, 0, sizeof(*in2));
310 in2->sin_family = AF_INET;
311 in2->sin_addr.s_addr = htonl((127<<24) | iface);
312 in2->sin_port = htons(prt);
313
314 *len = sizeof(*in2);
315 break;
316 }
317 #ifdef HAVE_IPV6
318 case SOCKET_TYPE_CHAR_TCP_V6:
319 case SOCKET_TYPE_CHAR_UDP_V6: {
320 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)(void *)in;
321
322 if ((*len) < sizeof(*in2)) {
323 errno = EINVAL;
324 return -1;
325 }
326
327 memset(in2, 0, sizeof(*in2));
328 in2->sin6_family = AF_INET6;
329 in2->sin6_addr = *swrap_ipv6();
330 in2->sin6_addr.s6_addr[15] = iface;
331 in2->sin6_port = htons(prt);
332
333 *len = sizeof(*in2);
334 break;
335 }
336 #endif
337 default:
338 errno = EINVAL;
339 return -1;
340 }
341
342 return 0;
343 }
344
345 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
346 int *bcast)
347 {
348 char type = '\0';
349 unsigned int prt;
350 unsigned int iface;
351 int is_bcast = 0;
352
353 if (bcast) *bcast = 0;
354
355 switch (inaddr->sa_family) {
356 case AF_INET: {
357 const struct sockaddr_in *in =
358 (const struct sockaddr_in *)(const void *)inaddr;
359 unsigned int addr = ntohl(in->sin_addr.s_addr);
360 char u_type = '\0';
361 char b_type = '\0';
362 char a_type = '\0';
363
364 switch (si->type) {
365 case SOCK_STREAM:
366 u_type = SOCKET_TYPE_CHAR_TCP;
367 break;
368 case SOCK_DGRAM:
369 u_type = SOCKET_TYPE_CHAR_UDP;
370 a_type = SOCKET_TYPE_CHAR_UDP;
371 b_type = SOCKET_TYPE_CHAR_UDP;
372 break;
373 }
374
375 prt = ntohs(in->sin_port);
376 if (a_type && addr == 0xFFFFFFFF) {
377 /* 255.255.255.255 only udp */
378 is_bcast = 2;
379 type = a_type;
380 iface = socket_wrapper_default_iface();
381 } else if (b_type && addr == 0x7FFFFFFF) {
382 /* 127.255.255.255 only udp */
383 is_bcast = 1;
384 type = b_type;
385 iface = socket_wrapper_default_iface();
386 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
387 /* 127.0.0.X */
388 is_bcast = 0;
389 type = u_type;
390 iface = (addr & 0x000000FF);
391 } else {
392 errno = ENETUNREACH;
393 return -1;
394 }
395 if (bcast) *bcast = is_bcast;
396 break;
397 }
398 #ifdef HAVE_IPV6
399 case AF_INET6: {
400 const struct sockaddr_in6 *in =
401 (const struct sockaddr_in6 *)(const void *)inaddr;
402 struct in6_addr cmp1, cmp2;
403
404 switch (si->type) {
405 case SOCK_STREAM:
406 type = SOCKET_TYPE_CHAR_TCP_V6;
407 break;
408 case SOCK_DGRAM:
409 type = SOCKET_TYPE_CHAR_UDP_V6;
410 break;
411 }
412
413 /* XXX no multicast/broadcast */
414
415 prt = ntohs(in->sin6_port);
416
417 cmp1 = *swrap_ipv6();
418 cmp2 = in->sin6_addr;
419 cmp2.s6_addr[15] = 0;
420 if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
421 iface = in->sin6_addr.s6_addr[15];
422 } else {
423 errno = ENETUNREACH;
424 return -1;
425 }
426
427 break;
428 }
429 #endif
430 default:
431 errno = ENETUNREACH;
432 return -1;
433 }
434
435 if (prt == 0) {
436 errno = EINVAL;
437 return -1;
438 }
439
440 if (is_bcast) {
441 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
442 socket_wrapper_dir());
443 /* the caller need to do more processing */
444 return 0;
445 }
446
447 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
448 socket_wrapper_dir(), type, iface, prt);
449
450 return 0;
451 }
452
453 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
454 int *bcast)
455 {
456 char type = '\0';
457 unsigned int prt;
458 unsigned int iface;
459 struct stat st;
460 int is_bcast = 0;
461
462 if (bcast) *bcast = 0;
463
464 switch (si->family) {
465 case AF_INET: {
466 const struct sockaddr_in *in =
467 (const struct sockaddr_in *)(const void *)inaddr;
468 unsigned int addr = ntohl(in->sin_addr.s_addr);
469 char u_type = '\0';
470 char d_type = '\0';
471 char b_type = '\0';
472 char a_type = '\0';
473
474 prt = ntohs(in->sin_port);
475
476 switch (si->type) {
477 case SOCK_STREAM:
478 u_type = SOCKET_TYPE_CHAR_TCP;
479 d_type = SOCKET_TYPE_CHAR_TCP;
480 break;
481 case SOCK_DGRAM:
482 u_type = SOCKET_TYPE_CHAR_UDP;
483 d_type = SOCKET_TYPE_CHAR_UDP;
484 a_type = SOCKET_TYPE_CHAR_UDP;
485 b_type = SOCKET_TYPE_CHAR_UDP;
486 break;
487 }
488
489 if (addr == 0) {
490 /* 0.0.0.0 */
491 is_bcast = 0;
492 type = d_type;
493 iface = socket_wrapper_default_iface();
494 } else if (a_type && addr == 0xFFFFFFFF) {
495 /* 255.255.255.255 only udp */
496 is_bcast = 2;
497 type = a_type;
498 iface = socket_wrapper_default_iface();
499 } else if (b_type && addr == 0x7FFFFFFF) {
500 /* 127.255.255.255 only udp */
501 is_bcast = 1;
502 type = b_type;
503 iface = socket_wrapper_default_iface();
504 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
505 /* 127.0.0.X */
506 is_bcast = 0;
507 type = u_type;
508 iface = (addr & 0x000000FF);
509 } else {
510 errno = EADDRNOTAVAIL;
511 return -1;
512 }
513 break;
514 }
515 #ifdef HAVE_IPV6
516 case AF_INET6: {
517 const struct sockaddr_in6 *in =
518 (const struct sockaddr_in6 *)(const void *)inaddr;
519 struct in6_addr cmp1, cmp2;
520
521 switch (si->type) {
522 case SOCK_STREAM:
523 type = SOCKET_TYPE_CHAR_TCP_V6;
524 break;
525 case SOCK_DGRAM:
526 type = SOCKET_TYPE_CHAR_UDP_V6;
527 break;
528 }
529
530 /* XXX no multicast/broadcast */
531
532 prt = ntohs(in->sin6_port);
533
534 cmp1 = *swrap_ipv6();
535 cmp2 = in->sin6_addr;
536 cmp2.s6_addr[15] = 0;
537 if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
538 iface = socket_wrapper_default_iface();
539 } else if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
540 iface = in->sin6_addr.s6_addr[15];
541 } else {
542 errno = EADDRNOTAVAIL;
543 return -1;
544 }
545
546 break;
547 }
548 #endif
549 default:
550 errno = EADDRNOTAVAIL;
551 return -1;
552 }
553
554
555 if (bcast) *bcast = is_bcast;
556
557 if (prt == 0) {
558 /* handle auto-allocation of ephemeral ports */
559 for (prt = 5001; prt < 10000; prt++) {
560 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
561 socket_wrapper_dir(), type, iface, prt);
562 if (stat(un->sun_path, &st) == 0) continue;
563
564 set_port(si->family, prt, si->myname);
565 break;
566 }
567 if (prt == 10000) {
568 errno = ENFILE;
569 return -1;
570 }
571 }
572
573 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
574 socket_wrapper_dir(), type, iface, prt);
575 return 0;
576 }
577
578 static struct socket_info *find_socket_info(int fd)
579 {
580 struct socket_info *i;
581 for (i = sockets; i; i = i->next) {
582 if (i->fd == fd)
583 return i;
584 }
585
586 return NULL;
587 }
588
589 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
590 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
591 {
592 struct sockaddr *out = (struct sockaddr *)(void *)out_addr;
593 if (!out_addr)
594 return 0;
595
596 out->sa_family = AF_UNIX;
597 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
598 out->sa_len = sizeof(*out_addr);
599 #endif
600
601 switch (in_addr->sa_family) {
602 case AF_INET:
603 #ifdef HAVE_IPV6
604 case AF_INET6:
605 #endif
606 switch (si->type) {
607 case SOCK_STREAM:
608 case SOCK_DGRAM:
609 break;
610 default:
611 errno = ESOCKTNOSUPPORT;
612 return -1;
613 }
614 if (alloc_sock) {
615 return convert_in_un_alloc(si, in_addr, out_addr, bcast);
616 } else {
617 return convert_in_un_remote(si, in_addr, out_addr, bcast);
618 }
619 default:
620 break;
621 }
622
623 errno = EAFNOSUPPORT;
624 return -1;
625 }
626
627 static int sockaddr_convert_from_un(const struct socket_info *si,
628 const struct sockaddr_un *in_addr,
629 socklen_t un_addrlen,
630 int family,
631 struct sockaddr *out_addr,
632 socklen_t *out_addrlen)
633 {
634 int ret;
635
636 if (out_addr == NULL || out_addrlen == NULL)
637 return 0;
638
639 if (un_addrlen == 0) {
640 *out_addrlen = 0;
641 return 0;
642 }
643
644 switch (family) {
645 case AF_INET:
646 #ifdef HAVE_IPV6
647 case AF_INET6:
648 #endif
649 switch (si->type) {
650 case SOCK_STREAM:
651 case SOCK_DGRAM:
652 break;
653 default:
654 errno = ESOCKTNOSUPPORT;
655 return -1;
656 }
657 ret = convert_un_in(in_addr, out_addr, out_addrlen);
658 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
659 out_addr->sa_len = *out_addrlen;
660 #endif
661 return ret;
662 default:
663 break;
664 }
665
666 errno = EAFNOSUPPORT;
667 return -1;
668 }
669
670 enum swrap_packet_type {
671 SWRAP_CONNECT_SEND,
672 SWRAP_CONNECT_UNREACH,
673 SWRAP_CONNECT_RECV,
674 SWRAP_CONNECT_ACK,
675 SWRAP_ACCEPT_SEND,
676 SWRAP_ACCEPT_RECV,
677 SWRAP_ACCEPT_ACK,
678 SWRAP_RECVFROM,
679 SWRAP_SENDTO,
680 SWRAP_SENDTO_UNREACH,
681 SWRAP_PENDING_RST,
682 SWRAP_RECV,
683 SWRAP_RECV_RST,
684 SWRAP_SEND,
685 SWRAP_SEND_RST,
686 SWRAP_CLOSE_SEND,
687 SWRAP_CLOSE_RECV,
688 SWRAP_CLOSE_ACK,
689 };
690
691 struct swrap_file_hdr {
692 uint32_t magic;
693 uint16_t version_major;
694 uint16_t version_minor;
695 int32_t timezone;
696 uint32_t sigfigs;
697 uint32_t frame_max_len;
698 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
699 uint32_t link_type;
700 };
701 #define SWRAP_FILE_HDR_SIZE 24
702
703 struct swrap_packet_frame {
704 uint32_t seconds;
705 uint32_t micro_seconds;
706 uint32_t recorded_length;
707 uint32_t full_length;
708 };
709 #define SWRAP_PACKET_FRAME_SIZE 16
710
711 union swrap_packet_ip {
712 struct {
713 uint8_t ver_hdrlen;
714 uint8_t tos;
715 uint16_t packet_length;
716 uint16_t identification;
717 uint8_t flags;
718 uint8_t fragment;
719 uint8_t ttl;
720 uint8_t protocol;
721 uint16_t hdr_checksum;
722 uint32_t src_addr;
723 uint32_t dest_addr;
724 } v4;
725 #define SWRAP_PACKET_IP_V4_SIZE 20
726 struct {
727 uint8_t ver_prio;
728 uint8_t flow_label_high;
729 uint16_t flow_label_low;
730 uint16_t payload_length;
731 uint8_t next_header;
732 uint8_t hop_limit;
733 uint8_t src_addr[16];
734 uint8_t dest_addr[16];
735 } v6;
736 #define SWRAP_PACKET_IP_V6_SIZE 40
737 };
738 #define SWRAP_PACKET_IP_SIZE 40
739
740 union swrap_packet_payload {
741 struct {
742 uint16_t source_port;
743 uint16_t dest_port;
744 uint32_t seq_num;
745 uint32_t ack_num;
746 uint8_t hdr_length;
747 uint8_t control;
748 uint16_t window;
749 uint16_t checksum;
750 uint16_t urg;
751 } tcp;
752 #define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
753 struct {
754 uint16_t source_port;
755 uint16_t dest_port;
756 uint16_t length;
757 uint16_t checksum;
758 } udp;
759 #define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
760 struct {
761 uint8_t type;
762 uint8_t code;
763 uint16_t checksum;
764 uint32_t unused;
765 } icmp4;
766 #define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
767 struct {
768 uint8_t type;
769 uint8_t code;
770 uint16_t checksum;
771 uint32_t unused;
772 } icmp6;
773 #define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
774 };
775 #define SWRAP_PACKET_PAYLOAD_SIZE 20
776
777 #define SWRAP_PACKET_MIN_ALLOC \
778 (SWRAP_PACKET_FRAME_SIZE + \
779 SWRAP_PACKET_IP_SIZE + \
780 SWRAP_PACKET_PAYLOAD_SIZE)
781
782 static const char *socket_wrapper_pcap_file(void)
783 {
784 static int initialized = 0;
785 static const char *s = NULL;
786 static const struct swrap_file_hdr h;
787 static const struct swrap_packet_frame f;
788 static const union swrap_packet_ip i;
789 static const union swrap_packet_payload p;
790
791 if (initialized == 1) {
792 return s;
793 }
794 initialized = 1;
795
796 /*
797 * TODO: don't use the structs use plain buffer offsets
798 * and PUSH_U8(), PUSH_U16() and PUSH_U32()
799 *
800 * for now make sure we disable PCAP support
801 * if the struct has alignment!
802 */
803 if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
804 return NULL;
805 }
806 if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
807 return NULL;
808 }
809 if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
810 return NULL;
811 }
812 if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
813 return NULL;
814 }
815 if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
816 return NULL;
817 }
818 if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
819 return NULL;
820 }
821 if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
822 return NULL;
823 }
824 if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
825 return NULL;
826 }
827 if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
828 return NULL;
829 }
830 if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
831 return NULL;
832 }
833
834 s = getenv("SOCKET_WRAPPER_PCAP_FILE");
835 if (s == NULL) {
836 return NULL;
837 }
838 if (strncmp(s, "./", 2) == 0) {
839 s += 2;
840 }
841 return s;
842 }
843
844 static uint8_t *swrap_packet_init(struct timeval *tval,
845 const struct sockaddr *src,
846 const struct sockaddr *dest,
847 int socket_type,
848 const uint8_t *payload,
849 size_t payload_len,
850 unsigned long tcp_seqno,
851 unsigned long tcp_ack,
852 unsigned char tcp_ctl,
853 int unreachable,
854 size_t *_packet_len)
855 {
856 uint8_t *base;
857 uint8_t *buf;
858 struct swrap_packet_frame *frame;
859 union swrap_packet_ip *ip;
860 union swrap_packet_payload *pay;
861 size_t packet_len;
862 size_t alloc_len;
863 size_t nonwire_len = sizeof(*frame);
864 size_t wire_hdr_len = 0;
865 size_t wire_len = 0;
866 size_t ip_hdr_len = 0;
867 size_t icmp_hdr_len = 0;
868 size_t icmp_truncate_len = 0;
869 uint8_t protocol = 0, icmp_protocol = 0;
870 const struct sockaddr_in *src_in = NULL;
871 const struct sockaddr_in *dest_in = NULL;
872 #ifdef HAVE_IPV6
873 const struct sockaddr_in6 *src_in6 = NULL;
874 const struct sockaddr_in6 *dest_in6 = NULL;
875 #endif
876 uint16_t src_port;
877 uint16_t dest_port;
878
879 switch (src->sa_family) {
880 case AF_INET:
881 src_in = (const struct sockaddr_in *)src;
882 dest_in = (const struct sockaddr_in *)dest;
883 src_port = src_in->sin_port;
884 dest_port = dest_in->sin_port;
885 ip_hdr_len = sizeof(ip->v4);
886 break;
887 #ifdef HAVE_IPV6
888 case AF_INET6:
889 src_in6 = (const struct sockaddr_in6 *)src;
890 dest_in6 = (const struct sockaddr_in6 *)dest;
891 src_port = src_in6->sin6_port;
892 dest_port = dest_in6->sin6_port;
893 ip_hdr_len = sizeof(ip->v6);
894 break;
895 #endif
896 default:
897 return NULL;
898 }
899
900 switch (socket_type) {
901 case SOCK_STREAM:
902 protocol = 0x06; /* TCP */
903 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
904 wire_len = wire_hdr_len + payload_len;
905 break;
906
907 case SOCK_DGRAM:
908 protocol = 0x11; /* UDP */
909 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
910 wire_len = wire_hdr_len + payload_len;
911 break;
912
913 default:
914 return NULL;
915 }
916
917 if (unreachable) {
918 icmp_protocol = protocol;
919 switch (src->sa_family) {
920 case AF_INET:
921 protocol = 0x01; /* ICMPv4 */
922 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
923 break;
924 #ifdef HAVE_IPV6
925 case AF_INET6:
926 protocol = 0x3A; /* ICMPv6 */
927 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
928 break;
929 #endif
930 }
931 if (wire_len > 64 ) {
932 icmp_truncate_len = wire_len - 64;
933 }
934 wire_hdr_len += icmp_hdr_len;
935 wire_len += icmp_hdr_len;
936 }
937
938 packet_len = nonwire_len + wire_len;
939 alloc_len = packet_len;
940 if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
941 alloc_len = SWRAP_PACKET_MIN_ALLOC;
942 }
943
944 base = (uint8_t *)malloc(alloc_len);
945 if (!base) return NULL;
946
947 buf = base;
948
949 frame = (struct swrap_packet_frame *)buf;
950 frame->seconds = tval->tv_sec;
951 frame->micro_seconds = tval->tv_usec;
952 frame->recorded_length = wire_len - icmp_truncate_len;
953 frame->full_length = wire_len - icmp_truncate_len;
954 buf += SWRAP_PACKET_FRAME_SIZE;
955
956 ip = (union swrap_packet_ip *)buf;
957 switch (src->sa_family) {
958 case AF_INET:
959 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
960 ip->v4.tos = 0x00;
961 ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
962 ip->v4.identification = htons(0xFFFF);
963 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
964 ip->v4.fragment = htons(0x0000);
965 ip->v4.ttl = 0xFF;
966 ip->v4.protocol = protocol;
967 ip->v4.hdr_checksum = htons(0x0000);
968 ip->v4.src_addr = src_in->sin_addr.s_addr;
969 ip->v4.dest_addr = dest_in->sin_addr.s_addr;
970 buf += SWRAP_PACKET_IP_V4_SIZE;
971 break;
972 #ifdef HAVE_IPV6
973 case AF_INET6:
974 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
975 ip->v6.flow_label_high = 0x00;
976 ip->v6.flow_label_low = 0x0000;
977 ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
978 ip->v6.next_header = protocol;
979 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
980 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
981 buf += SWRAP_PACKET_IP_V6_SIZE;
982 break;
983 #endif
984 }
985
986 if (unreachable) {
987 pay = (union swrap_packet_payload *)buf;
988 switch (src->sa_family) {
989 case AF_INET:
990 pay->icmp4.type = 0x03; /* destination unreachable */
991 pay->icmp4.code = 0x01; /* host unreachable */
992 pay->icmp4.checksum = htons(0x0000);
993 pay->icmp4.unused = htonl(0x00000000);
994 buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
995
996 /* set the ip header in the ICMP payload */
997 ip = (union swrap_packet_ip *)buf;
998 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
999 ip->v4.tos = 0x00;
1000 ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
1001 ip->v4.identification = htons(0xFFFF);
1002 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
1003 ip->v4.fragment = htons(0x0000);
1004 ip->v4.ttl = 0xFF;
1005 ip->v4.protocol = icmp_protocol;
1006 ip->v4.hdr_checksum = htons(0x0000);
1007 ip->v4.src_addr = dest_in->sin_addr.s_addr;
1008 ip->v4.dest_addr = src_in->sin_addr.s_addr;
1009 buf += SWRAP_PACKET_IP_V4_SIZE;
1010
1011 src_port = dest_in->sin_port;
1012 dest_port = src_in->sin_port;
1013 break;
1014 #ifdef HAVE_IPV6
1015 case AF_INET6:
1016 pay->icmp6.type = 0x01; /* destination unreachable */
1017 pay->icmp6.code = 0x03; /* address unreachable */
1018 pay->icmp6.checksum = htons(0x0000);
1019 pay->icmp6.unused = htonl(0x00000000);
1020 buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
1021
1022 /* set the ip header in the ICMP payload */
1023 ip = (union swrap_packet_ip *)buf;
1024 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
1025 ip->v6.flow_label_high = 0x00;
1026 ip->v6.flow_label_low = 0x0000;
1027 ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
1028 ip->v6.next_header = protocol;
1029 memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
1030 memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
1031 buf += SWRAP_PACKET_IP_V6_SIZE;
1032
1033 src_port = dest_in6->sin6_port;
1034 dest_port = src_in6->sin6_port;
1035 break;
1036 #endif
1037 }
1038 }
1039
1040 pay = (union swrap_packet_payload *)buf;
1041
1042 switch (socket_type) {
1043 case SOCK_STREAM:
1044 pay->tcp.source_port = src_port;
1045 pay->tcp.dest_port = dest_port;
1046 pay->tcp.seq_num = htonl(tcp_seqno);
1047 pay->tcp.ack_num = htonl(tcp_ack);
1048 pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
1049 pay->tcp.control = tcp_ctl;
1050 pay->tcp.window = htons(0x7FFF);
1051 pay->tcp.checksum = htons(0x0000);
1052 pay->tcp.urg = htons(0x0000);
1053 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
1054
1055 break;
1056
1057 case SOCK_DGRAM:
1058 pay->udp.source_port = src_port;
1059 pay->udp.dest_port = dest_port;
1060 pay->udp.length = htons(8 + payload_len);
1061 pay->udp.checksum = htons(0x0000);
1062 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
1063
1064 break;
1065 }
1066
1067 if (payload && payload_len > 0) {
1068 memcpy(buf, payload, payload_len);
1069 }
1070
1071 *_packet_len = packet_len - icmp_truncate_len;
1072 return base;
1073 }
1074
1075 static int swrap_get_pcap_fd(const char *fname)
1076 {
1077 static int fd = -1;
1078
1079 if (fd != -1) return fd;
1080
1081 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1082 if (fd != -1) {
1083 struct swrap_file_hdr file_hdr;
1084 file_hdr.magic = 0xA1B2C3D4;
1085 file_hdr.version_major = 0x0002;
1086 file_hdr.version_minor = 0x0004;
1087 file_hdr.timezone = 0x00000000;
1088 file_hdr.sigfigs = 0x00000000;
1089 file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
1090 file_hdr.link_type = 0x0065; /* 101 RAW IP */
1091
1092 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1093 close(fd);
1094 fd = -1;
1095 }
1096 return fd;
1097 }
1098
1099 fd = open(fname, O_WRONLY|O_APPEND, 0644);
1100
1101 return fd;
1102 }
1103
1104 static uint8_t *swrap_marshall_packet(struct socket_info *si,
1105 const struct sockaddr *addr,
1106 enum swrap_packet_type type,
1107 const void *buf, size_t len,
1108 size_t *packet_len)
1109 {
1110 const struct sockaddr *src_addr;
1111 const struct sockaddr *dest_addr;
1112 unsigned long tcp_seqno = 0;
1113 unsigned long tcp_ack = 0;
1114 unsigned char tcp_ctl = 0;
1115 int unreachable = 0;
1116
1117 struct timeval tv;
1118
1119 switch (si->family) {
1120 case AF_INET:
1121 break;
1122 #ifdef HAVE_IPV6
1123 case AF_INET6:
1124 break;
1125 #endif
1126 default:
1127 return NULL;
1128 }
1129
1130 switch (type) {
1131 case SWRAP_CONNECT_SEND:
1132 if (si->type != SOCK_STREAM) return NULL;
1133
1134 src_addr = si->myname;
1135 dest_addr = addr;
1136
1137 tcp_seqno = si->io.pck_snd;
1138 tcp_ack = si->io.pck_rcv;
1139 tcp_ctl = 0x02; /* SYN */
1140
1141 si->io.pck_snd += 1;
1142
1143 break;
1144
1145 case SWRAP_CONNECT_RECV:
1146 if (si->type != SOCK_STREAM) return NULL;
1147
1148 dest_addr = si->myname;
1149 src_addr = addr;
1150
1151 tcp_seqno = si->io.pck_rcv;
1152 tcp_ack = si->io.pck_snd;
1153 tcp_ctl = 0x12; /** SYN,ACK */
1154
1155 si->io.pck_rcv += 1;
1156
1157 break;
1158
1159 case SWRAP_CONNECT_UNREACH:
1160 if (si->type != SOCK_STREAM) return NULL;
1161
1162 dest_addr = si->myname;
1163 src_addr = addr;
1164
1165 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
1166 tcp_seqno = si->io.pck_snd - 1;
1167 tcp_ack = si->io.pck_rcv;
1168 tcp_ctl = 0x02; /* SYN */
1169 unreachable = 1;
1170
1171 break;
1172
1173 case SWRAP_CONNECT_ACK:
1174 if (si->type != SOCK_STREAM) return NULL;
1175
1176 src_addr = si->myname;
1177 dest_addr = addr;
1178
1179 tcp_seqno = si->io.pck_snd;
1180 tcp_ack = si->io.pck_rcv;
1181 tcp_ctl = 0x10; /* ACK */
1182
1183 break;
1184
1185 case SWRAP_ACCEPT_SEND:
1186 if (si->type != SOCK_STREAM) return NULL;
1187
1188 dest_addr = si->myname;
1189 src_addr = addr;
1190
1191 tcp_seqno = si->io.pck_rcv;
1192 tcp_ack = si->io.pck_snd;
1193 tcp_ctl = 0x02; /* SYN */
1194
1195 si->io.pck_rcv += 1;
1196
1197 break;
1198
1199 case SWRAP_ACCEPT_RECV:
1200 if (si->type != SOCK_STREAM) return NULL;
1201
1202 src_addr = si->myname;
1203 dest_addr = addr;
1204
1205 tcp_seqno = si->io.pck_snd;
1206 tcp_ack = si->io.pck_rcv;
1207 tcp_ctl = 0x12; /* SYN,ACK */
1208
1209 si->io.pck_snd += 1;
1210
1211 break;
1212
1213 case SWRAP_ACCEPT_ACK:
1214 if (si->type != SOCK_STREAM) return NULL;
1215
1216 dest_addr = si->myname;
1217 src_addr = addr;
1218
1219 tcp_seqno = si->io.pck_rcv;
1220 tcp_ack = si->io.pck_snd;
1221 tcp_ctl = 0x10; /* ACK */
1222
1223 break;
1224
1225 case SWRAP_SEND:
1226 src_addr = si->myname;
1227 dest_addr = si->peername;
1228
1229 tcp_seqno = si->io.pck_snd;
1230 tcp_ack = si->io.pck_rcv;
1231 tcp_ctl = 0x18; /* PSH,ACK */
1232
1233 si->io.pck_snd += len;
1234
1235 break;
1236
1237 case SWRAP_SEND_RST:
1238 dest_addr = si->myname;
1239 src_addr = si->peername;
1240
1241 if (si->type == SOCK_DGRAM) {
1242 return swrap_marshall_packet(si, si->peername,
1243 SWRAP_SENDTO_UNREACH,
1244 buf, len, packet_len);
1245 }
1246
1247 tcp_seqno = si->io.pck_rcv;
1248 tcp_ack = si->io.pck_snd;
1249 tcp_ctl = 0x14; /** RST,ACK */
1250
1251 break;
1252
1253 case SWRAP_PENDING_RST:
1254 dest_addr = si->myname;
1255 src_addr = si->peername;
1256
1257 if (si->type == SOCK_DGRAM) {
1258 return NULL;
1259 }
1260
1261 tcp_seqno = si->io.pck_rcv;
1262 tcp_ack = si->io.pck_snd;
1263 tcp_ctl = 0x14; /* RST,ACK */
1264
1265 break;
1266
1267 case SWRAP_RECV:
1268 dest_addr = si->myname;
1269 src_addr = si->peername;
1270
1271 tcp_seqno = si->io.pck_rcv;
1272 tcp_ack = si->io.pck_snd;
1273 tcp_ctl = 0x18; /* PSH,ACK */
1274
1275 si->io.pck_rcv += len;
1276
1277 break;
1278
1279 case SWRAP_RECV_RST:
1280 dest_addr = si->myname;
1281 src_addr = si->peername;
1282
1283 if (si->type == SOCK_DGRAM) {
1284 return NULL;
1285 }
1286
1287 tcp_seqno = si->io.pck_rcv;
1288 tcp_ack = si->io.pck_snd;
1289 tcp_ctl = 0x14; /* RST,ACK */
1290
1291 break;
1292
1293 case SWRAP_SENDTO:
1294 src_addr = si->myname;
1295 dest_addr = addr;
1296
1297 si->io.pck_snd += len;
1298
1299 break;
1300
1301 case SWRAP_SENDTO_UNREACH:
1302 dest_addr = si->myname;
1303 src_addr = addr;
1304
1305 unreachable = 1;
1306
1307 break;
1308
1309 case SWRAP_RECVFROM:
1310 dest_addr = si->myname;
1311 src_addr = addr;
1312
1313 si->io.pck_rcv += len;
1314
1315 break;
1316
1317 case SWRAP_CLOSE_SEND:
1318 if (si->type != SOCK_STREAM) return NULL;
1319
1320 src_addr = si->myname;
1321 dest_addr = si->peername;
1322
1323 tcp_seqno = si->io.pck_snd;
1324 tcp_ack = si->io.pck_rcv;
1325 tcp_ctl = 0x11; /* FIN, ACK */
1326
1327 si->io.pck_snd += 1;
1328
1329 break;
1330
1331 case SWRAP_CLOSE_RECV:
1332 if (si->type != SOCK_STREAM) return NULL;
1333
1334 dest_addr = si->myname;
1335 src_addr = si->peername;
1336
1337 tcp_seqno = si->io.pck_rcv;
1338 tcp_ack = si->io.pck_snd;
1339 tcp_ctl = 0x11; /* FIN,ACK */
1340
1341 si->io.pck_rcv += 1;
1342
1343 break;
1344
1345 case SWRAP_CLOSE_ACK:
1346 if (si->type != SOCK_STREAM) return NULL;
1347
1348 src_addr = si->myname;
1349 dest_addr = si->peername;
1350
1351 tcp_seqno = si->io.pck_snd;
1352 tcp_ack = si->io.pck_rcv;
1353 tcp_ctl = 0x10; /* ACK */
1354
1355 break;
1356 default:
1357 return NULL;
1358 }
1359
1360 swrapGetTimeOfDay(&tv);
1361
1362 return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1363 (const uint8_t *)buf, len,
1364 tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1365 packet_len);
1366 }
1367
1368 static void swrap_dump_packet(struct socket_info *si,
1369 const struct sockaddr *addr,
1370 enum swrap_packet_type type,
1371 const void *buf, size_t len)
1372 {
1373 const char *file_name;
1374 uint8_t *packet;
1375 size_t packet_len = 0;
1376 int fd;
1377
1378 file_name = socket_wrapper_pcap_file();
1379 if (!file_name) {
1380 return;
1381 }
1382
1383 packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1384 if (!packet) {
1385 return;
1386 }
1387
1388 fd = swrap_get_pcap_fd(file_name);
1389 if (fd != -1) {
1390 if (write(fd, packet, packet_len) != packet_len) {
1391 free(packet);
1392 return;
1393 }
1394 }
1395
1396 free(packet);
1397 }
1398
1399 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
1400 {
1401 struct socket_info *si;
1402 int fd;
1403 int real_type = type;
1404 #ifdef SOCK_CLOEXEC
1405 real_type &= ~SOCK_CLOEXEC;
1406 #endif
1407 #ifdef SOCK_NONBLOCK
1408 real_type &= ~SOCK_NONBLOCK;
1409 #endif
1410
1411 if (!socket_wrapper_dir()) {
1412 return real_socket(family, type, protocol);
1413 }
1414
1415 switch (family) {
1416 case AF_INET:
1417 #ifdef HAVE_IPV6
1418 case AF_INET6:
1419 #endif
1420 break;
1421 case AF_UNIX:
1422 return real_socket(family, type, protocol);
1423 default:
1424 errno = EAFNOSUPPORT;
1425 return -1;
1426 }
1427
1428 switch (real_type) {
1429 case SOCK_STREAM:
1430 break;
1431 case SOCK_DGRAM:
1432 break;
1433 default:
1434 errno = EPROTONOSUPPORT;
1435 return -1;
1436 }
1437
1438 switch (protocol) {
1439 case 0:
1440 break;
1441 case 6:
1442 if (real_type == SOCK_STREAM) {
1443 break;
1444 }
1445 /*fall through*/
1446 case 17:
1447 if (real_type == SOCK_DGRAM) {
1448 break;
1449 }
1450 /*fall through*/
1451 default:
1452 errno = EPROTONOSUPPORT;
1453 return -1;
1454 }
1455
1456 /* We must call real_socket with type, from the caller, not the version we removed
1457 SOCK_CLOEXEC and SOCK_NONBLOCK from */
1458 fd = real_socket(AF_UNIX, type, 0);
1459
1460 if (fd == -1) return -1;
1461
1462 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1463
1464 si->family = family;
1465
1466 /* however, the rest of the socket_wrapper code expects just
1467 * the type, not the flags */
1468 si->type = real_type;
1469 si->protocol = protocol;
1470 si->fd = fd;
1471
1472 SWRAP_DLIST_ADD(sockets, si);
1473
1474 return si->fd;
1475 }
1476
1477 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1478 {
1479 struct socket_info *parent_si, *child_si;
1480 int fd;
1481 struct sockaddr_un un_addr;
1482 socklen_t un_addrlen = sizeof(un_addr);
1483 struct sockaddr_un un_my_addr;
1484 socklen_t un_my_addrlen = sizeof(un_my_addr);
1485 struct sockaddr *my_addr;
1486 socklen_t my_addrlen, len;
1487 int ret;
1488
1489 parent_si = find_socket_info(s);
1490 if (!parent_si) {
1491 return real_accept(s, addr, addrlen);
1492 }
1493
1494 /*
1495 * assume out sockaddr have the same size as the in parent
1496 * socket family
1497 */
1498 my_addrlen = socket_length(parent_si->family);
1499 if (my_addrlen <= 0) {
1500 errno = EINVAL;
1501 return -1;
1502 }
1503
1504 my_addr = (struct sockaddr *)malloc(my_addrlen);
1505 if (my_addr == NULL) {
1506 return -1;
1507 }
1508
1509 memset(&un_addr, 0, sizeof(un_addr));
1510 memset(&un_my_addr, 0, sizeof(un_my_addr));
1511
1512 ret = real_accept(s, (struct sockaddr *)(void *)&un_addr, &un_addrlen);
1513 if (ret == -1) {
1514 free(my_addr);
1515 return ret;
1516 }
1517
1518 fd = ret;
1519
1520 len = my_addrlen;
1521 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1522 parent_si->family, my_addr, &len);
1523 if (ret == -1) {
1524 free(my_addr);
1525 close(fd);
1526 return ret;
1527 }
1528
1529 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1530 memset(child_si, 0, sizeof(*child_si));
1531
1532 child_si->fd = fd;
1533 child_si->family = parent_si->family;
1534 child_si->type = parent_si->type;
1535 child_si->protocol = parent_si->protocol;
1536 child_si->bound = 1;
1537 child_si->is_server = 1;
1538 child_si->connected = 1;
1539
1540 child_si->peername_len = len;
1541 child_si->peername = sockaddr_dup(my_addr, len);
1542
1543 if (addr != NULL && addrlen != NULL) {
1544 size_t copy_len = MIN(*addrlen, len);
1545 if (copy_len > 0) {
1546 memcpy(addr, my_addr, copy_len);
1547 }
1548 *addrlen = len;
1549 }
1550
1551 ret = real_getsockname(fd, (struct sockaddr *)(void *)&un_my_addr,
1552 &un_my_addrlen);
1553 if (ret == -1) {
1554 free(child_si);
1555 close(fd);
1556 return ret;
1557 }
1558
1559 len = my_addrlen;
1560 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1561 child_si->family, my_addr, &len);
1562 if (ret == -1) {
1563 free(child_si);
1564 free(my_addr);
1565 close(fd);
1566 return ret;
1567 }
1568
1569 child_si->myname_len = len;
1570 child_si->myname = sockaddr_dup(my_addr, len);
1571 free(my_addr);
1572
1573 SWRAP_DLIST_ADD(sockets, child_si);
1574
1575 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1576 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1577 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1578
1579 return fd;
1580 }
1581
1582 static int autobind_start_init;
1583 static int autobind_start;
1584
1585 /* using sendto() or connect() on an unbound socket would give the
1586 recipient no way to reply, as unlike UDP and TCP, a unix domain
1587 socket can't auto-assign emphemeral port numbers, so we need to
1588 assign it here.
1589 Note: this might change the family from ipv6 to ipv4
1590 */
1591 static int swrap_auto_bind(struct socket_info *si, int family)
1592 {
1593 struct sockaddr_un un_addr;
1594 int i;
1595 char type;
1596 int ret;
1597 int port;
1598 struct stat st;
1599
1600 if (autobind_start_init != 1) {
1601 autobind_start_init = 1;
1602 autobind_start = getpid();
1603 autobind_start %= 50000;
1604 autobind_start += 10000;
1605 }
1606
1607 un_addr.sun_family = AF_UNIX;
1608
1609 switch (family) {
1610 case AF_INET: {
1611 struct sockaddr_in in;
1612
1613 switch (si->type) {
1614 case SOCK_STREAM:
1615 type = SOCKET_TYPE_CHAR_TCP;
1616 break;
1617 case SOCK_DGRAM:
1618 type = SOCKET_TYPE_CHAR_UDP;
1619 break;
1620 default:
1621 errno = ESOCKTNOSUPPORT;
1622 return -1;
1623 }
1624
1625 memset(&in, 0, sizeof(in));
1626 in.sin_family = AF_INET;
1627 in.sin_addr.s_addr = htonl(127<<24 |
1628 socket_wrapper_default_iface());
1629
1630 si->myname_len = sizeof(in);
1631 si->myname = sockaddr_dup(&in, si->myname_len);
1632 break;
1633 }
1634 #ifdef HAVE_IPV6
1635 case AF_INET6: {
1636 struct sockaddr_in6 in6;
1637
1638 if (si->family != family) {
1639 errno = ENETUNREACH;
1640 return -1;
1641 }
1642
1643 switch (si->type) {
1644 case SOCK_STREAM:
1645 type = SOCKET_TYPE_CHAR_TCP_V6;
1646 break;
1647 case SOCK_DGRAM:
1648 type = SOCKET_TYPE_CHAR_UDP_V6;
1649 break;
1650 default:
1651 errno = ESOCKTNOSUPPORT;
1652 return -1;
1653 }
1654
1655 memset(&in6, 0, sizeof(in6));
1656 in6.sin6_family = AF_INET6;
1657 in6.sin6_addr = *swrap_ipv6();
1658 in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
1659 si->myname_len = sizeof(in6);
1660 si->myname = sockaddr_dup(&in6, si->myname_len);
1661 break;
1662 }
1663 #endif
1664 default:
1665 errno = ESOCKTNOSUPPORT;
1666 return -1;
1667 }
1668
1669 if (autobind_start > 60000) {
1670 autobind_start = 10000;
1671 }
1672
1673 for (i=0;i<1000;i++) {
1674 port = autobind_start + i;
1675 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1676 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1677 type, socket_wrapper_default_iface(), port);
1678 if (stat(un_addr.sun_path, &st) == 0) continue;
1679
1680 ret = real_bind(si->fd, (struct sockaddr *)(void *)&un_addr,
1681 sizeof(un_addr));
1682 if (ret == -1) return ret;
1683
1684 si->tmp_path = strdup(un_addr.sun_path);
1685 si->bound = 1;
1686 autobind_start = port + 1;
1687 break;
1688 }
1689 if (i == 1000) {
1690 errno = ENFILE;
1691 return -1;
1692 }
1693
1694 si->family = family;
1695 set_port(si->family, port, si->myname);
1696
1697 return 0;
1698 }
1699
1700
1701 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1702 {
1703 int ret;
1704 struct sockaddr_un un_addr;
1705 struct socket_info *si = find_socket_info(s);
1706 int bcast = 0;
1707
1708 if (!si) {
1709 return real_connect(s, serv_addr, addrlen);
1710 }
1711
1712 if (si->bound == 0) {
1713 ret = swrap_auto_bind(si, serv_addr->sa_family);
1714 if (ret == -1) return -1;
1715 }
1716
1717 if (si->family != serv_addr->sa_family) {
1718 errno = EINVAL;
1719 return -1;
1720 }
1721
1722 ret = sockaddr_convert_to_un(si, serv_addr,
1723 addrlen, &un_addr, 0, &bcast);
1724 if (ret == -1) return -1;
1725
1726 if (bcast) {
1727 errno = ENETUNREACH;
1728 return -1;
1729 }
1730
1731 if (si->type == SOCK_DGRAM) {
1732 si->defer_connect = 1;
1733 ret = 0;
1734 } else {
1735 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1736
1737 ret = real_connect(s, (struct sockaddr *)(void *)&un_addr,
1738 sizeof(struct sockaddr_un));
1739 }
1740
1741 /* to give better errors */
1742 if (ret == -1 && errno == ENOENT) {
1743 errno = EHOSTUNREACH;
1744 }
1745
1746 if (ret == 0) {
1747 si->peername_len = addrlen;
1748 si->peername = sockaddr_dup(serv_addr, addrlen);
1749 si->connected = 1;
1750
1751 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1752 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1753 } else {
1754 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1755 }
1756
1757 return ret;
1758 }
1759
1760 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1761 {
1762 int ret;
1763 struct sockaddr_un un_addr;
1764 struct socket_info *si = find_socket_info(s);
1765
1766 if (!si) {
1767 return real_bind(s, myaddr, addrlen);
1768 }
1769
1770 si->myname_len = addrlen;
1771 si->myname = sockaddr_dup(myaddr, addrlen);
1772
1773 ret = sockaddr_convert_to_un(si, myaddr, addrlen, &un_addr, 1, &si->bcast);
1774 if (ret == -1) return -1;
1775
1776 unlink(un_addr.sun_path);
1777
1778 ret = real_bind(s, (struct sockaddr *)(void *)&un_addr,
1779 sizeof(struct sockaddr_un));
1780
1781 if (ret == 0) {
1782 si->bound = 1;
1783 }
1784
1785 return ret;
1786 }
1787
1788 _PUBLIC_ int swrap_listen(int s, int backlog)
1789 {
1790 int ret;
1791 struct socket_info *si = find_socket_info(s);
1792
1793 if (!si) {
1794 return real_listen(s, backlog);
1795 }
1796
1797 ret = real_listen(s, backlog);
1798
1799 return ret;
1800 }
1801
1802 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1803 {
1804 struct socket_info *si = find_socket_info(s);
1805
1806 if (!si) {
1807 return real_getpeername(s, name, addrlen);
1808 }
1809
1810 if (!si->peername)
1811 {
1812 errno = ENOTCONN;
1813 return -1;
1814 }
1815
1816 memcpy(name, si->peername, si->peername_len);
1817 *addrlen = si->peername_len;
1818
1819 return 0;
1820 }
1821
1822 _PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1823 {
1824 struct socket_info *si = find_socket_info(s);
1825
1826 if (!si) {
1827 return real_getsockname(s, name, addrlen);
1828 }
1829
1830 memcpy(name, si->myname, si->myname_len);
1831 *addrlen = si->myname_len;
1832
1833 return 0;
1834 }
1835
1836 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1837 {
1838 struct socket_info *si = find_socket_info(s);
1839
1840 if (!si) {
1841 return real_getsockopt(s, level, optname, optval, optlen);
1842 }
1843
1844 if (level == SOL_SOCKET) {
1845 return real_getsockopt(s, level, optname, optval, optlen);
1846 }
1847
1848 errno = ENOPROTOOPT;
1849 return -1;
1850 }
1851
1852 _PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1853 {
1854 struct socket_info *si = find_socket_info(s);
1855
1856 if (!si) {
1857 return real_setsockopt(s, level, optname, optval, optlen);
1858 }
1859
1860 if (level == SOL_SOCKET) {
1861 return real_setsockopt(s, level, optname, optval, optlen);
1862 }
1863
1864 switch (si->family) {
1865 case AF_INET:
1866 return 0;
1867 #ifdef HAVE_IPV6
1868 case AF_INET6:
1869 return 0;
1870 #endif
1871 default:
1872 errno = ENOPROTOOPT;
1873 return -1;
1874 }
1875 }
1876
1877 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1878 {
1879 int ret;
1880 struct socket_info *si = find_socket_info(s);
1881 int value;
1882
1883 if (!si) {
1884 return real_ioctl(s, r, p);
1885 }
1886
1887 ret = real_ioctl(s, r, p);
1888
1889 switch (r) {
1890 case FIONREAD:
1891 value = *((int *)p);
1892 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1893 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1894 } else if (value == 0) { /* END OF FILE */
1895 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1896 }
1897 break;
1898 }
1899
1900 return ret;
1901 }
1902
1903 static ssize_t swrap_sendmsg_before(struct socket_info *si,
1904 struct msghdr *msg,
1905 struct iovec *tmp_iov,
1906 struct sockaddr_un *tmp_un,
1907 const struct sockaddr_un **to_un,
1908 const struct sockaddr **to,
1909 int *bcast)
1910 {
1911 size_t i, len = 0;
1912 ssize_t ret;
1913
1914 if (to_un) {
1915 *to_un = NULL;
1916 }
1917 if (to) {
1918 *to = NULL;
1919 }
1920 if (bcast) {
1921 *bcast = 0;
1922 }
1923
1924 switch (si->type) {
1925 case SOCK_STREAM:
1926 if (!si->connected) {
1927 errno = ENOTCONN;
1928 return -1;
1929 }
1930
1931 if (msg->msg_iovlen == 0) {
1932 break;
1933 }
1934
1935 /*
1936 * cut down to 1500 byte packets for stream sockets,
1937 * which makes it easier to format PCAP capture files
1938 * (as the caller will simply continue from here)
1939 */
1940
1941 for (i=0; i < msg->msg_iovlen; i++) {
1942 size_t nlen;
1943 nlen = len + msg->msg_iov[i].iov_len;
1944 if (nlen > 1500) {
1945 break;
1946 }
1947 }
1948 msg->msg_iovlen = i;
1949 if (msg->msg_iovlen == 0) {
1950 *tmp_iov = msg->msg_iov[0];
1951 tmp_iov->iov_len = MIN(tmp_iov->iov_len, 1500);
1952 msg->msg_iov = tmp_iov;
1953 msg->msg_iovlen = 1;
1954 }
1955 break;
1956
1957 case SOCK_DGRAM:
1958 if (si->connected) {
1959 if (msg->msg_name) {
1960 errno = EISCONN;
1961 return -1;
1962 }
1963 } else {
1964 const struct sockaddr *msg_name;
1965 msg_name = (const struct sockaddr *)msg->msg_name;
1966
1967 if (msg_name == NULL) {
1968 errno = ENOTCONN;
1969 return -1;
1970 }
1971
1972
1973 ret = sockaddr_convert_to_un(si, msg_name, msg->msg_namelen,
1974 tmp_un, 0, bcast);
1975 if (ret == -1) return -1;
1976
1977 if (to_un) {
1978 *to_un = tmp_un;
1979 }
1980 if (to) {
1981 *to = msg_name;
1982 }
1983 msg->msg_name = tmp_un;
1984 msg->msg_namelen = sizeof(*tmp_un);
1985 }
1986
1987 if (si->bound == 0) {
1988 ret = swrap_auto_bind(si, si->family);
1989 if (ret == -1) return -1;
1990 }
1991
1992 if (!si->defer_connect) {
1993 break;
1994 }
1995
1996 ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
1997 tmp_un, 0, NULL);
1998 if (ret == -1) return -1;
1999
2000 ret = real_connect(si->fd, (struct sockaddr *)(void *)tmp_un,
2001 sizeof(*tmp_un));
2002
2003 /* to give better errors */
2004 if (ret == -1 && errno == ENOENT) {
2005 errno = EHOSTUNREACH;
2006 }
2007
2008 if (ret == -1) {
2009 return ret;
2010 }
2011
2012 si->defer_connect = 0;
2013 break;
2014 default:
2015 errno = EHOSTUNREACH;
2016 return -1;
2017 }
2018
2019 return 0;
2020 }
2021
2022 static void swrap_sendmsg_after(struct socket_info *si,
2023 struct msghdr *msg,
2024 const struct sockaddr *to,
2025 ssize_t ret)
2026 {
2027 int saved_errno = errno;
2028 size_t i, len = 0;
2029 uint8_t *buf;
2030 off_t ofs = 0;
2031 size_t avail = 0;
2032 size_t remain;
2033
2034 /* to give better errors */
2035 if (ret == -1 && saved_errno == ENOENT) {
2036 saved_errno = EHOSTUNREACH;
2037 }
2038
2039 for (i=0; i < msg->msg_iovlen; i++) {
2040 avail += msg->msg_iov[i].iov_len;
2041 }
2042
2043 if (ret == -1) {
2044 remain = MIN(80, avail);
2045 } else {
2046 remain = ret;
2047 }
2048
2049 /* we capture it as one single packet */
2050 buf = (uint8_t *)malloc(remain);
2051 if (!buf) {
2052 /* we just not capture the packet */
2053 errno = saved_errno;
2054 return;
2055 }
2056
2057 for (i=0; i < msg->msg_iovlen; i++) {
2058 size_t this_time = MIN(remain, msg->msg_iov[i].iov_len);
2059 memcpy(buf + ofs,
2060 msg->msg_iov[i].iov_base,
2061 this_time);
2062 ofs += this_time;
2063 remain -= this_time;
2064 }
2065 len = ofs;
2066
2067 switch (si->type) {
2068 case SOCK_STREAM:
2069 if (ret == -1) {
2070 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2071 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2072 } else {
2073 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2074 }
2075 break;
2076
2077 case SOCK_DGRAM:
2078 if (si->connected) {
2079 to = si->peername;
2080 }
2081 if (ret == -1) {
2082 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2083 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
2084 } else {
2085 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2086 }
2087 break;
2088 }
2089
2090 free(buf);
2091 errno = saved_errno;
2092 }
2093
2094 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
2095 {
2096 struct sockaddr_un un_addr;
2097 socklen_t un_addrlen = sizeof(un_addr);
2098 int ret;
2099 struct socket_info *si = find_socket_info(s);
2100 struct sockaddr_storage ss;
2101 socklen_t ss_len = sizeof(ss);
2102
2103 if (!si) {
2104 return real_recvfrom(s, buf, len, flags, from, fromlen);
2105 }
2106
2107 if (!from) {
2108 from = (struct sockaddr *)(void *)&ss;
2109 fromlen = &ss_len;
2110 }
2111
2112 if (si->type == SOCK_STREAM) {
2113 /* cut down to 1500 byte packets for stream sockets,
2114 * which makes it easier to format PCAP capture files
2115 * (as the caller will simply continue from here) */
2116 len = MIN(len, 1500);
2117 }
2118
2119 /* irix 6.4 forgets to null terminate the sun_path string :-( */
2120 memset(&un_addr, 0, sizeof(un_addr));
2121 ret = real_recvfrom(s, buf, len, flags,
2122 (struct sockaddr *)(void *)&un_addr, &un_addrlen);
2123 if (ret == -1)
2124 return ret;
2125
2126 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
2127 si->family, from, fromlen) == -1) {
2128 return -1;
2129 }
2130
2131 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
2132
2133 return ret;
2134 }
2135
2136
2137 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
2138 {
2139 struct msghdr msg;
2140 struct iovec tmp;
2141 struct sockaddr_un un_addr;
2142 const struct sockaddr_un *to_un = NULL;
2143 ssize_t ret;
2144 struct socket_info *si = find_socket_info(s);
2145 int bcast = 0;
2146
2147 if (!si) {
2148 return real_sendto(s, buf, len, flags, to, tolen);
2149 }
2150
2151 tmp.iov_base = discard_const_p(char, buf);
2152 tmp.iov_len = len;
2153
2154 ZERO_STRUCT(msg);
2155 msg.msg_name = discard_const_p(struct sockaddr, to); /* optional address */
2156 msg.msg_namelen = tolen; /* size of address */
2157 msg.msg_iov = &tmp; /* scatter/gather array */
2158 msg.msg_iovlen = 1; /* # elements in msg_iov */
2159 #if 0 /* not available on solaris */
2160 msg.msg_control = NULL; /* ancillary data, see below */
2161 msg.msg_controllen = 0; /* ancillary data buffer len */
2162 msg.msg_flags = 0; /* flags on received message */
2163 #endif
2164
2165 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
2166 if (ret == -1) return -1;
2167
2168 buf = msg.msg_iov[0].iov_base;
2169 len = msg.msg_iov[0].iov_len;
2170
2171 if (bcast) {
2172 struct stat st;
2173 unsigned int iface;
2174 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
2175 char type;
2176
2177 type = SOCKET_TYPE_CHAR_UDP;
2178
2179 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
2180 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
2181 socket_wrapper_dir(), type, iface, prt);
2182 if (stat(un_addr.sun_path, &st) != 0) continue;
2183
2184 /* ignore the any errors in broadcast sends */
2185 real_sendto(s, buf, len, flags,
2186 (struct sockaddr *)(void *)&un_addr,
2187 sizeof(un_addr));
2188 }
2189
2190 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2191
2192 return len;
2193 }
2194
2195 ret = real_sendto(s, buf, len, flags, msg.msg_name, msg.msg_namelen);
2196
2197 swrap_sendmsg_after(si, &msg, to, ret);
2198
2199 return ret;
2200 }
2201
2202 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
2203 {
2204 int ret;
2205 struct socket_info *si = find_socket_info(s);
2206
2207 if (!si) {
2208 return real_recv(s, buf, len, flags);
2209 }
2210
2211 if (si->type == SOCK_STREAM) {
2212 /* cut down to 1500 byte packets for stream sockets,
2213 * which makes it easier to format PCAP capture files
2214 * (as the caller will simply continue from here) */
2215 len = MIN(len, 1500);
2216 }
2217
2218 ret = real_recv(s, buf, len, flags);
2219 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2220 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2221 } else if (ret == 0) { /* END OF FILE */
2222 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2223 } else if (ret > 0) {
2224 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2225 }
2226
2227 return ret;
2228 }
2229
2230 _PUBLIC_ ssize_t swrap_read(int s, void *buf, size_t len)
2231 {
2232 int ret;
2233 struct socket_info *si = find_socket_info(s);
2234
2235 if (!si) {
2236 return real_read(s, buf, len);
2237 }
2238
2239 if (si->type == SOCK_STREAM) {
2240 /* cut down to 1500 byte packets for stream sockets,
2241 * which makes it easier to format PCAP capture files
2242 * (as the caller will simply continue from here) */
2243 len = MIN(len, 1500);
2244 }
2245
2246 ret = real_read(s, buf, len);
2247 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2248 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2249 } else if (ret == 0) { /* END OF FILE */
2250 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2251 } else if (ret > 0) {
2252 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2253 }
2254
2255 return ret;
2256 }
2257
2258
2259 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
2260 {
2261 struct msghdr msg;
2262 struct iovec tmp;
2263 struct sockaddr_un un_addr;
2264 ssize_t ret;
2265 struct socket_info *si = find_socket_info(s);
2266
2267 if (!si) {
2268 return real_send(s, buf, len, flags);
2269 }
2270
2271 tmp.iov_base = discard_const_p(char, buf);
2272 tmp.iov_len = len;
2273
2274 ZERO_STRUCT(msg);
2275 msg.msg_name = NULL; /* optional address */
2276 msg.msg_namelen = 0; /* size of address */
2277 msg.msg_iov = &tmp; /* scatter/gather array */
2278 msg.msg_iovlen = 1; /* # elements in msg_iov */
2279 #if 0 /* not available on solaris */
2280 msg.msg_control = NULL; /* ancillary data, see below */
2281 msg.msg_controllen = 0; /* ancillary data buffer len */
2282 msg.msg_flags = 0; /* flags on received message */
2283 #endif
2284
2285 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
2286 if (ret == -1) return -1;
2287
2288 buf = msg.msg_iov[0].iov_base;
2289 len = msg.msg_iov[0].iov_len;
2290
2291 ret = real_send(s, buf, len, flags);
2292
2293 swrap_sendmsg_after(si, &msg, NULL, ret);
2294
2295 return ret;
2296 }
2297
2298 _PUBLIC_ ssize_t swrap_sendmsg(int s, const struct msghdr *omsg, int flags)
2299 {
2300 struct msghdr msg;
2301 struct iovec tmp;
2302 struct sockaddr_un un_addr;
2303 const struct sockaddr_un *to_un = NULL;
2304 const struct sockaddr *to = NULL;
2305 ssize_t ret;
2306 struct socket_info *si = find_socket_info(s);
2307 int bcast = 0;
2308
2309 if (!si) {
2310 return real_sendmsg(s, omsg, flags);
2311 }
2312
2313 tmp.iov_base = NULL;
2314 tmp.iov_len = 0;
2315
2316 msg = *omsg;
2317 #if 0
2318 msg.msg_name = omsg->msg_name; /* optional address */
2319 msg.msg_namelen = omsg->msg_namelen; /* size of address */
2320 msg.msg_iov = omsg->msg_iov; /* scatter/gather array */
2321 msg.msg_iovlen = omsg->msg_iovlen; /* # elements in msg_iov */
2322 /* the following is not available on solaris */
2323 msg.msg_control = omsg->msg_control; /* ancillary data, see below */
2324 msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */
2325 msg.msg_flags = omsg->msg_flags; /* flags on received message */
2326 #endif
2327
2328 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
2329 if (ret == -1) return -1;
2330
2331 if (bcast) {
2332 struct stat st;
2333 unsigned int iface;
2334 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
2335 char type;
2336 size_t i, len = 0;
2337 uint8_t *buf;
2338 off_t ofs = 0;
2339 size_t avail = 0;
2340 size_t remain;
2341
2342 for (i=0; i < msg.msg_iovlen; i++) {
2343 avail += msg.msg_iov[i].iov_len;
2344 }
2345
2346 len = avail;
2347 remain = avail;
2348
2349 /* we capture it as one single packet */
2350 buf = (uint8_t *)malloc(remain);
2351 if (!buf) {
2352 return -1;
2353 }
2354
2355 for (i=0; i < msg.msg_iovlen; i++) {
2356 size_t this_time = MIN(remain, msg.msg_iov[i].iov_len);
2357 memcpy(buf + ofs,
2358 msg.msg_iov[i].iov_base,
2359 this_time);
2360 ofs += this_time;
2361 remain -= this_time;
2362 }
2363
2364 type = SOCKET_TYPE_CHAR_UDP;
2365
2366 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
2367 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
2368 socket_wrapper_dir(), type, iface, prt);
2369 if (stat(un_addr.sun_path, &st) != 0) continue;
2370
2371 msg.msg_name = &un_addr; /* optional address */
2372 msg.msg_namelen = sizeof(un_addr); /* size of address */
2373
2374 /* ignore the any errors in broadcast sends */
2375 real_sendmsg(s, &msg, flags);
2376 }
2377
2378 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2379 free(buf);
2380
2381 return len;
2382 }
2383
2384 ret = real_sendmsg(s, &msg, flags);
2385
2386 swrap_sendmsg_after(si, &msg, to, ret);
2387
2388 return ret;
2389 }
2390
2391 int swrap_readv(int s, const struct iovec *vector, size_t count)
2392 {
2393 int ret;
2394 struct socket_info *si = find_socket_info(s);
2395 struct iovec v;
2396
2397 if (!si) {
2398 return real_readv(s, vector, count);
2399 }
2400
2401 if (!si->connected) {
2402 errno = ENOTCONN;
2403 return -1;
2404 }
2405
2406 if (si->type == SOCK_STREAM && count > 0) {
2407 /* cut down to 1500 byte packets for stream sockets,
2408 * which makes it easier to format PCAP capture files
2409 * (as the caller will simply continue from here) */
2410 size_t i, len = 0;
2411
2412 for (i=0; i < count; i++) {
2413 size_t nlen;
2414 nlen = len + vector[i].iov_len;
2415 if (nlen > 1500) {
2416 break;
2417 }
2418 }
2419 count = i;
2420 if (count == 0) {
2421 v = vector[0];
2422 v.iov_len = MIN(v.iov_len, 1500);
2423 vector = &v;
2424 count = 1;
2425 }
2426 }
2427
2428 ret = real_readv(s, vector, count);
2429 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2430 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2431 } else if (ret == 0) { /* END OF FILE */
2432 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2433 } else if (ret > 0) {
2434 uint8_t *buf;
2435 off_t ofs = 0;
2436 size_t i;
2437 size_t remain = ret;
2438
2439 /* we capture it as one single packet */
2440 buf = (uint8_t *)malloc(ret);
2441 if (!buf) {
2442 /* we just not capture the packet */
2443 errno = 0;
2444 return ret;
2445 }
2446
2447 for (i=0; i < count; i++) {
2448 size_t this_time = MIN(remain, vector[i].iov_len);
2449 memcpy(buf + ofs,
2450 vector[i].iov_base,
2451 this_time);
2452 ofs += this_time;
2453 remain -= this_time;
2454 }
2455
2456 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2457 free(buf);
2458 }
2459
2460 return ret;
2461 }
2462
2463 int swrap_writev(int s, const struct iovec *vector, size_t count)
2464 {
2465 struct msghdr msg;
2466 struct iovec tmp;
2467 struct sockaddr_un un_addr;
2468 ssize_t ret;
2469 struct socket_info *si = find_socket_info(s);
2470
2471 if (!si) {
2472 return real_writev(s, vector, count);
2473 }
2474
2475 tmp.iov_base = NULL;
2476 tmp.iov_len = 0;
2477
2478 ZERO_STRUCT(msg);
2479 msg.msg_name = NULL; /* optional address */
2480 msg.msg_namelen = 0; /* size of address */
2481 msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */
2482 msg.msg_iovlen = count; /* # elements in msg_iov */
2483 #if 0 /* not available on solaris */
2484 msg.msg_control = NULL; /* ancillary data, see below */
2485 msg.msg_controllen = 0; /* ancillary data buffer len */
2486 msg.msg_flags = 0; /* flags on received message */
2487 #endif
2488
2489 ret = swrap_sendmsg_before(si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
2490 if (ret == -1) return -1;
2491
2492 ret = real_writev(s, msg.msg_iov, msg.msg_iovlen);
2493
2494 swrap_sendmsg_after(si, &msg, NULL, ret);
2495
2496 return ret;
2497 }
2498
2499 _PUBLIC_ int swrap_close(int fd)
2500 {
2501 struct socket_info *si = find_socket_info(fd);
2502 int ret;
2503
2504 if (!si) {
2505 return real_close(fd);
2506 }
2507
2508 SWRAP_DLIST_REMOVE(sockets, si);
2509
2510 if (si->myname && si->peername) {
2511 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
2512 }
2513
2514 ret = real_close(fd);
2515
2516 if (si->myname && si->peername) {
2517 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
2518 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
2519 }
2520
2521 if (si->path) free(si->path);
2522 if (si->myname) free(si->myname);
2523 if (si->peername) free(si->peername);
2524 if (si->tmp_path) {
2525 unlink(si->tmp_path);
2526 free(si->tmp_path);
2527 }
2528 free(si);
2529
2530 return ret;
2531 }
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