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lib/util: consolidate module loading into common code
[Samba/gebeck_regimport.git] / lib / socket_wrapper / socket_wrapper.c
bloba54f50f2f5741c0f7c7cdb3ab3f4fc973699a1b4
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 #define real_dup dup
131 #define real_dup2 dup2
132 #endif
133
134 #ifdef HAVE_GETTIMEOFDAY_TZ
135 #define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
136 #else
137 #define swrapGetTimeOfDay(tval) gettimeofday(tval)
138 #endif
139
140 /* we need to use a very terse format here as IRIX 6.4 silently
141 truncates names to 16 chars, so if we use a longer name then we
142 can't tell which port a packet came from with recvfrom()
143
144 with this format we have 8 chars left for the directory name
145 */
146 #define SOCKET_FORMAT "%c%02X%04X"
147 #define SOCKET_TYPE_CHAR_TCP 'T'
148 #define SOCKET_TYPE_CHAR_UDP 'U'
149 #define SOCKET_TYPE_CHAR_TCP_V6 'X'
150 #define SOCKET_TYPE_CHAR_UDP_V6 'Y'
151
152 /* This limit is to avoid broadcast sendto() needing to stat too many
153 * files. It may be raised (with a performance cost) to up to 254
154 * without changing the format above */
155 #define MAX_WRAPPED_INTERFACES 32
156
157 #ifdef HAVE_IPV6
158 /*
159 * FD00::5357:5FXX
160 */
161 static const struct in6_addr *swrap_ipv6(void)
162 {
163 static struct in6_addr v;
164 static int initialized;
165 int ret;
166
167 if (initialized) {
168 return &v;
169 }
170 initialized = 1;
171
172 ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
173 if (ret <= 0) {
174 abort();
175 }
176
177 return &v;
178 }
179 #endif
180
181 static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
182 {
183 struct sockaddr *ret = (struct sockaddr *)malloc(len);
184 memcpy(ret, data, len);
185 return ret;
186 }
187
188 static void set_port(int family, int prt, struct sockaddr *addr)
189 {
190 switch (family) {
191 case AF_INET:
192 ((struct sockaddr_in *)addr)->sin_port = htons(prt);
193 break;
194 #ifdef HAVE_IPV6
195 case AF_INET6:
196 ((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
197 break;
198 #endif
199 }
200 }
201
202 static size_t socket_length(int family)
203 {
204 switch (family) {
205 case AF_INET:
206 return sizeof(struct sockaddr_in);
207 #ifdef HAVE_IPV6
208 case AF_INET6:
209 return sizeof(struct sockaddr_in6);
210 #endif
211 }
212 return 0;
213 }
214
215 struct socket_info_fd {
216 struct socket_info_fd *prev, *next;
217 int fd;
218 };
219
220 struct socket_info
221 {
222 struct socket_info_fd *fds;
223
224 int family;
225 int type;
226 int protocol;
227 int bound;
228 int bcast;
229 int is_server;
230 int connected;
231 int defer_connect;
232
233 char *tmp_path;
234
235 struct sockaddr *myname;
236 socklen_t myname_len;
237
238 struct sockaddr *peername;
239 socklen_t peername_len;
240
241 struct {
242 unsigned long pck_snd;
243 unsigned long pck_rcv;
244 } io;
245
246 struct socket_info *prev, *next;
247 };
248
249 static struct socket_info *sockets;
250
251 const char *socket_wrapper_dir(void)
252 {
253 const char *s = getenv("SOCKET_WRAPPER_DIR");
254 if (s == NULL) {
255 return NULL;
256 }
257 if (strncmp(s, "./", 2) == 0) {
258 s += 2;
259 }
260 return s;
261 }
262
263 unsigned int socket_wrapper_default_iface(void)
264 {
265 const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
266 if (s) {
267 unsigned int iface;
268 if (sscanf(s, "%u", &iface) == 1) {
269 if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
270 return iface;
271 }
272 }
273 }
274
275 return 1;/* 127.0.0.1 */
276 }
277
278 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
279 {
280 unsigned int iface;
281 unsigned int prt;
282 const char *p;
283 char type;
284
285 p = strrchr(un->sun_path, '/');
286 if (p) p++; else p = un->sun_path;
287
288 if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
289 errno = EINVAL;
290 return -1;
291 }
292
293 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
294 errno = EINVAL;
295 return -1;
296 }
297
298 if (prt > 0xFFFF) {
299 errno = EINVAL;
300 return -1;
301 }
302
303 switch(type) {
304 case SOCKET_TYPE_CHAR_TCP:
305 case SOCKET_TYPE_CHAR_UDP: {
306 struct sockaddr_in *in2 = (struct sockaddr_in *)(void *)in;
307
308 if ((*len) < sizeof(*in2)) {
309 errno = EINVAL;
310 return -1;
311 }
312
313 memset(in2, 0, sizeof(*in2));
314 in2->sin_family = AF_INET;
315 in2->sin_addr.s_addr = htonl((127<<24) | iface);
316 in2->sin_port = htons(prt);
317
318 *len = sizeof(*in2);
319 break;
320 }
321 #ifdef HAVE_IPV6
322 case SOCKET_TYPE_CHAR_TCP_V6:
323 case SOCKET_TYPE_CHAR_UDP_V6: {
324 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)(void *)in;
325
326 if ((*len) < sizeof(*in2)) {
327 errno = EINVAL;
328 return -1;
329 }
330
331 memset(in2, 0, sizeof(*in2));
332 in2->sin6_family = AF_INET6;
333 in2->sin6_addr = *swrap_ipv6();
334 in2->sin6_addr.s6_addr[15] = iface;
335 in2->sin6_port = htons(prt);
336
337 *len = sizeof(*in2);
338 break;
339 }
340 #endif
341 default:
342 errno = EINVAL;
343 return -1;
344 }
345
346 return 0;
347 }
348
349 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
350 int *bcast)
351 {
352 char type = '\0';
353 unsigned int prt;
354 unsigned int iface;
355 int is_bcast = 0;
356
357 if (bcast) *bcast = 0;
358
359 switch (inaddr->sa_family) {
360 case AF_INET: {
361 const struct sockaddr_in *in =
362 (const struct sockaddr_in *)(const void *)inaddr;
363 unsigned int addr = ntohl(in->sin_addr.s_addr);
364 char u_type = '\0';
365 char b_type = '\0';
366 char a_type = '\0';
367
368 switch (si->type) {
369 case SOCK_STREAM:
370 u_type = SOCKET_TYPE_CHAR_TCP;
371 break;
372 case SOCK_DGRAM:
373 u_type = SOCKET_TYPE_CHAR_UDP;
374 a_type = SOCKET_TYPE_CHAR_UDP;
375 b_type = SOCKET_TYPE_CHAR_UDP;
376 break;
377 }
378
379 prt = ntohs(in->sin_port);
380 if (a_type && addr == 0xFFFFFFFF) {
381 /* 255.255.255.255 only udp */
382 is_bcast = 2;
383 type = a_type;
384 iface = socket_wrapper_default_iface();
385 } else if (b_type && addr == 0x7FFFFFFF) {
386 /* 127.255.255.255 only udp */
387 is_bcast = 1;
388 type = b_type;
389 iface = socket_wrapper_default_iface();
390 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
391 /* 127.0.0.X */
392 is_bcast = 0;
393 type = u_type;
394 iface = (addr & 0x000000FF);
395 } else {
396 errno = ENETUNREACH;
397 return -1;
398 }
399 if (bcast) *bcast = is_bcast;
400 break;
401 }
402 #ifdef HAVE_IPV6
403 case AF_INET6: {
404 const struct sockaddr_in6 *in =
405 (const struct sockaddr_in6 *)(const void *)inaddr;
406 struct in6_addr cmp1, cmp2;
407
408 switch (si->type) {
409 case SOCK_STREAM:
410 type = SOCKET_TYPE_CHAR_TCP_V6;
411 break;
412 case SOCK_DGRAM:
413 type = SOCKET_TYPE_CHAR_UDP_V6;
414 break;
415 }
416
417 /* XXX no multicast/broadcast */
418
419 prt = ntohs(in->sin6_port);
420
421 cmp1 = *swrap_ipv6();
422 cmp2 = in->sin6_addr;
423 cmp2.s6_addr[15] = 0;
424 if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
425 iface = in->sin6_addr.s6_addr[15];
426 } else {
427 errno = ENETUNREACH;
428 return -1;
429 }
430
431 break;
432 }
433 #endif
434 default:
435 errno = ENETUNREACH;
436 return -1;
437 }
438
439 if (prt == 0) {
440 errno = EINVAL;
441 return -1;
442 }
443
444 if (is_bcast) {
445 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
446 socket_wrapper_dir());
447 /* the caller need to do more processing */
448 return 0;
449 }
450
451 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
452 socket_wrapper_dir(), type, iface, prt);
453
454 return 0;
455 }
456
457 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
458 int *bcast)
459 {
460 char type = '\0';
461 unsigned int prt;
462 unsigned int iface;
463 struct stat st;
464 int is_bcast = 0;
465
466 if (bcast) *bcast = 0;
467
468 switch (si->family) {
469 case AF_INET: {
470 const struct sockaddr_in *in =
471 (const struct sockaddr_in *)(const void *)inaddr;
472 unsigned int addr = ntohl(in->sin_addr.s_addr);
473 char u_type = '\0';
474 char d_type = '\0';
475 char b_type = '\0';
476 char a_type = '\0';
477
478 prt = ntohs(in->sin_port);
479
480 switch (si->type) {
481 case SOCK_STREAM:
482 u_type = SOCKET_TYPE_CHAR_TCP;
483 d_type = SOCKET_TYPE_CHAR_TCP;
484 break;
485 case SOCK_DGRAM:
486 u_type = SOCKET_TYPE_CHAR_UDP;
487 d_type = SOCKET_TYPE_CHAR_UDP;
488 a_type = SOCKET_TYPE_CHAR_UDP;
489 b_type = SOCKET_TYPE_CHAR_UDP;
490 break;
491 }
492
493 if (addr == 0) {
494 /* 0.0.0.0 */
495 is_bcast = 0;
496 type = d_type;
497 iface = socket_wrapper_default_iface();
498 } else if (a_type && addr == 0xFFFFFFFF) {
499 /* 255.255.255.255 only udp */
500 is_bcast = 2;
501 type = a_type;
502 iface = socket_wrapper_default_iface();
503 } else if (b_type && addr == 0x7FFFFFFF) {
504 /* 127.255.255.255 only udp */
505 is_bcast = 1;
506 type = b_type;
507 iface = socket_wrapper_default_iface();
508 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
509 /* 127.0.0.X */
510 is_bcast = 0;
511 type = u_type;
512 iface = (addr & 0x000000FF);
513 } else {
514 errno = EADDRNOTAVAIL;
515 return -1;
516 }
517 break;
518 }
519 #ifdef HAVE_IPV6
520 case AF_INET6: {
521 const struct sockaddr_in6 *in =
522 (const struct sockaddr_in6 *)(const void *)inaddr;
523 struct in6_addr cmp1, cmp2;
524
525 switch (si->type) {
526 case SOCK_STREAM:
527 type = SOCKET_TYPE_CHAR_TCP_V6;
528 break;
529 case SOCK_DGRAM:
530 type = SOCKET_TYPE_CHAR_UDP_V6;
531 break;
532 }
533
534 /* XXX no multicast/broadcast */
535
536 prt = ntohs(in->sin6_port);
537
538 cmp1 = *swrap_ipv6();
539 cmp2 = in->sin6_addr;
540 cmp2.s6_addr[15] = 0;
541 if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
542 iface = socket_wrapper_default_iface();
543 } else if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
544 iface = in->sin6_addr.s6_addr[15];
545 } else {
546 errno = EADDRNOTAVAIL;
547 return -1;
548 }
549
550 break;
551 }
552 #endif
553 default:
554 errno = EADDRNOTAVAIL;
555 return -1;
556 }
557
558
559 if (bcast) *bcast = is_bcast;
560
561 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
562 errno = EINVAL;
563 return -1;
564 }
565
566 if (prt == 0) {
567 /* handle auto-allocation of ephemeral ports */
568 for (prt = 5001; prt < 10000; prt++) {
569 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
570 socket_wrapper_dir(), type, iface, prt);
571 if (stat(un->sun_path, &st) == 0) continue;
572
573 set_port(si->family, prt, si->myname);
574 break;
575 }
576 if (prt == 10000) {
577 errno = ENFILE;
578 return -1;
579 }
580 }
581
582 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
583 socket_wrapper_dir(), type, iface, prt);
584 return 0;
585 }
586
587 static struct socket_info *find_socket_info(int fd)
588 {
589 struct socket_info *i;
590 for (i = sockets; i; i = i->next) {
591 struct socket_info_fd *f;
592 for (f = i->fds; f; f = f->next) {
593 if (f->fd == fd) {
594 return i;
595 }
596 }
597 }
598
599 return NULL;
600 }
601
602 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
603 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
604 {
605 struct sockaddr *out = (struct sockaddr *)(void *)out_addr;
606 if (!out_addr)
607 return 0;
608
609 out->sa_family = AF_UNIX;
610 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
611 out->sa_len = sizeof(*out_addr);
612 #endif
613
614 switch (in_addr->sa_family) {
615 case AF_INET:
616 #ifdef HAVE_IPV6
617 case AF_INET6:
618 #endif
619 switch (si->type) {
620 case SOCK_STREAM:
621 case SOCK_DGRAM:
622 break;
623 default:
624 errno = ESOCKTNOSUPPORT;
625 return -1;
626 }
627 if (alloc_sock) {
628 return convert_in_un_alloc(si, in_addr, out_addr, bcast);
629 } else {
630 return convert_in_un_remote(si, in_addr, out_addr, bcast);
631 }
632 default:
633 break;
634 }
635
636 errno = EAFNOSUPPORT;
637 return -1;
638 }
639
640 static int sockaddr_convert_from_un(const struct socket_info *si,
641 const struct sockaddr_un *in_addr,
642 socklen_t un_addrlen,
643 int family,
644 struct sockaddr *out_addr,
645 socklen_t *out_addrlen)
646 {
647 int ret;
648
649 if (out_addr == NULL || out_addrlen == NULL)
650 return 0;
651
652 if (un_addrlen == 0) {
653 *out_addrlen = 0;
654 return 0;
655 }
656
657 switch (family) {
658 case AF_INET:
659 #ifdef HAVE_IPV6
660 case AF_INET6:
661 #endif
662 switch (si->type) {
663 case SOCK_STREAM:
664 case SOCK_DGRAM:
665 break;
666 default:
667 errno = ESOCKTNOSUPPORT;
668 return -1;
669 }
670 ret = convert_un_in(in_addr, out_addr, out_addrlen);
671 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
672 out_addr->sa_len = *out_addrlen;
673 #endif
674 return ret;
675 default:
676 break;
677 }
678
679 errno = EAFNOSUPPORT;
680 return -1;
681 }
682
683 enum swrap_packet_type {
684 SWRAP_CONNECT_SEND,
685 SWRAP_CONNECT_UNREACH,
686 SWRAP_CONNECT_RECV,
687 SWRAP_CONNECT_ACK,
688 SWRAP_ACCEPT_SEND,
689 SWRAP_ACCEPT_RECV,
690 SWRAP_ACCEPT_ACK,
691 SWRAP_RECVFROM,
692 SWRAP_SENDTO,
693 SWRAP_SENDTO_UNREACH,
694 SWRAP_PENDING_RST,
695 SWRAP_RECV,
696 SWRAP_RECV_RST,
697 SWRAP_SEND,
698 SWRAP_SEND_RST,
699 SWRAP_CLOSE_SEND,
700 SWRAP_CLOSE_RECV,
701 SWRAP_CLOSE_ACK,
702 };
703
704 struct swrap_file_hdr {
705 uint32_t magic;
706 uint16_t version_major;
707 uint16_t version_minor;
708 int32_t timezone;
709 uint32_t sigfigs;
710 uint32_t frame_max_len;
711 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
712 uint32_t link_type;
713 };
714 #define SWRAP_FILE_HDR_SIZE 24
715
716 struct swrap_packet_frame {
717 uint32_t seconds;
718 uint32_t micro_seconds;
719 uint32_t recorded_length;
720 uint32_t full_length;
721 };
722 #define SWRAP_PACKET_FRAME_SIZE 16
723
724 union swrap_packet_ip {
725 struct {
726 uint8_t ver_hdrlen;
727 uint8_t tos;
728 uint16_t packet_length;
729 uint16_t identification;
730 uint8_t flags;
731 uint8_t fragment;
732 uint8_t ttl;
733 uint8_t protocol;
734 uint16_t hdr_checksum;
735 uint32_t src_addr;
736 uint32_t dest_addr;
737 } v4;
738 #define SWRAP_PACKET_IP_V4_SIZE 20
739 struct {
740 uint8_t ver_prio;
741 uint8_t flow_label_high;
742 uint16_t flow_label_low;
743 uint16_t payload_length;
744 uint8_t next_header;
745 uint8_t hop_limit;
746 uint8_t src_addr[16];
747 uint8_t dest_addr[16];
748 } v6;
749 #define SWRAP_PACKET_IP_V6_SIZE 40
750 };
751 #define SWRAP_PACKET_IP_SIZE 40
752
753 union swrap_packet_payload {
754 struct {
755 uint16_t source_port;
756 uint16_t dest_port;
757 uint32_t seq_num;
758 uint32_t ack_num;
759 uint8_t hdr_length;
760 uint8_t control;
761 uint16_t window;
762 uint16_t checksum;
763 uint16_t urg;
764 } tcp;
765 #define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
766 struct {
767 uint16_t source_port;
768 uint16_t dest_port;
769 uint16_t length;
770 uint16_t checksum;
771 } udp;
772 #define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
773 struct {
774 uint8_t type;
775 uint8_t code;
776 uint16_t checksum;
777 uint32_t unused;
778 } icmp4;
779 #define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
780 struct {
781 uint8_t type;
782 uint8_t code;
783 uint16_t checksum;
784 uint32_t unused;
785 } icmp6;
786 #define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
787 };
788 #define SWRAP_PACKET_PAYLOAD_SIZE 20
789
790 #define SWRAP_PACKET_MIN_ALLOC \
791 (SWRAP_PACKET_FRAME_SIZE + \
792 SWRAP_PACKET_IP_SIZE + \
793 SWRAP_PACKET_PAYLOAD_SIZE)
794
795 static const char *socket_wrapper_pcap_file(void)
796 {
797 static int initialized = 0;
798 static const char *s = NULL;
799 static const struct swrap_file_hdr h;
800 static const struct swrap_packet_frame f;
801 static const union swrap_packet_ip i;
802 static const union swrap_packet_payload p;
803
804 if (initialized == 1) {
805 return s;
806 }
807 initialized = 1;
808
809 /*
810 * TODO: don't use the structs use plain buffer offsets
811 * and PUSH_U8(), PUSH_U16() and PUSH_U32()
812 *
813 * for now make sure we disable PCAP support
814 * if the struct has alignment!
815 */
816 if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
817 return NULL;
818 }
819 if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
820 return NULL;
821 }
822 if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
823 return NULL;
824 }
825 if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
826 return NULL;
827 }
828 if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
829 return NULL;
830 }
831 if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
832 return NULL;
833 }
834 if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
835 return NULL;
836 }
837 if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
838 return NULL;
839 }
840 if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
841 return NULL;
842 }
843 if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
844 return NULL;
845 }
846
847 s = getenv("SOCKET_WRAPPER_PCAP_FILE");
848 if (s == NULL) {
849 return NULL;
850 }
851 if (strncmp(s, "./", 2) == 0) {
852 s += 2;
853 }
854 return s;
855 }
856
857 static uint8_t *swrap_packet_init(struct timeval *tval,
858 const struct sockaddr *src,
859 const struct sockaddr *dest,
860 int socket_type,
861 const uint8_t *payload,
862 size_t payload_len,
863 unsigned long tcp_seqno,
864 unsigned long tcp_ack,
865 unsigned char tcp_ctl,
866 int unreachable,
867 size_t *_packet_len)
868 {
869 uint8_t *base;
870 uint8_t *buf;
871 struct swrap_packet_frame *frame;
872 union swrap_packet_ip *ip;
873 union swrap_packet_payload *pay;
874 size_t packet_len;
875 size_t alloc_len;
876 size_t nonwire_len = sizeof(*frame);
877 size_t wire_hdr_len = 0;
878 size_t wire_len = 0;
879 size_t ip_hdr_len = 0;
880 size_t icmp_hdr_len = 0;
881 size_t icmp_truncate_len = 0;
882 uint8_t protocol = 0, icmp_protocol = 0;
883 const struct sockaddr_in *src_in = NULL;
884 const struct sockaddr_in *dest_in = NULL;
885 #ifdef HAVE_IPV6
886 const struct sockaddr_in6 *src_in6 = NULL;
887 const struct sockaddr_in6 *dest_in6 = NULL;
888 #endif
889 uint16_t src_port;
890 uint16_t dest_port;
891
892 switch (src->sa_family) {
893 case AF_INET:
894 src_in = (const struct sockaddr_in *)src;
895 dest_in = (const struct sockaddr_in *)dest;
896 src_port = src_in->sin_port;
897 dest_port = dest_in->sin_port;
898 ip_hdr_len = sizeof(ip->v4);
899 break;
900 #ifdef HAVE_IPV6
901 case AF_INET6:
902 src_in6 = (const struct sockaddr_in6 *)src;
903 dest_in6 = (const struct sockaddr_in6 *)dest;
904 src_port = src_in6->sin6_port;
905 dest_port = dest_in6->sin6_port;
906 ip_hdr_len = sizeof(ip->v6);
907 break;
908 #endif
909 default:
910 return NULL;
911 }
912
913 switch (socket_type) {
914 case SOCK_STREAM:
915 protocol = 0x06; /* TCP */
916 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
917 wire_len = wire_hdr_len + payload_len;
918 break;
919
920 case SOCK_DGRAM:
921 protocol = 0x11; /* UDP */
922 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
923 wire_len = wire_hdr_len + payload_len;
924 break;
925
926 default:
927 return NULL;
928 }
929
930 if (unreachable) {
931 icmp_protocol = protocol;
932 switch (src->sa_family) {
933 case AF_INET:
934 protocol = 0x01; /* ICMPv4 */
935 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
936 break;
937 #ifdef HAVE_IPV6
938 case AF_INET6:
939 protocol = 0x3A; /* ICMPv6 */
940 icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
941 break;
942 #endif
943 }
944 if (wire_len > 64 ) {
945 icmp_truncate_len = wire_len - 64;
946 }
947 wire_hdr_len += icmp_hdr_len;
948 wire_len += icmp_hdr_len;
949 }
950
951 packet_len = nonwire_len + wire_len;
952 alloc_len = packet_len;
953 if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
954 alloc_len = SWRAP_PACKET_MIN_ALLOC;
955 }
956
957 base = (uint8_t *)malloc(alloc_len);
958 if (!base) return NULL;
959
960 buf = base;
961
962 frame = (struct swrap_packet_frame *)buf;
963 frame->seconds = tval->tv_sec;
964 frame->micro_seconds = tval->tv_usec;
965 frame->recorded_length = wire_len - icmp_truncate_len;
966 frame->full_length = wire_len - icmp_truncate_len;
967 buf += SWRAP_PACKET_FRAME_SIZE;
968
969 ip = (union swrap_packet_ip *)buf;
970 switch (src->sa_family) {
971 case AF_INET:
972 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
973 ip->v4.tos = 0x00;
974 ip->v4.packet_length = htons(wire_len - icmp_truncate_len);
975 ip->v4.identification = htons(0xFFFF);
976 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
977 ip->v4.fragment = htons(0x0000);
978 ip->v4.ttl = 0xFF;
979 ip->v4.protocol = protocol;
980 ip->v4.hdr_checksum = htons(0x0000);
981 ip->v4.src_addr = src_in->sin_addr.s_addr;
982 ip->v4.dest_addr = dest_in->sin_addr.s_addr;
983 buf += SWRAP_PACKET_IP_V4_SIZE;
984 break;
985 #ifdef HAVE_IPV6
986 case AF_INET6:
987 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
988 ip->v6.flow_label_high = 0x00;
989 ip->v6.flow_label_low = 0x0000;
990 ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
991 ip->v6.next_header = protocol;
992 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
993 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
994 buf += SWRAP_PACKET_IP_V6_SIZE;
995 break;
996 #endif
997 }
998
999 if (unreachable) {
1000 pay = (union swrap_packet_payload *)buf;
1001 switch (src->sa_family) {
1002 case AF_INET:
1003 pay->icmp4.type = 0x03; /* destination unreachable */
1004 pay->icmp4.code = 0x01; /* host unreachable */
1005 pay->icmp4.checksum = htons(0x0000);
1006 pay->icmp4.unused = htonl(0x00000000);
1007 buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
1008
1009 /* set the ip header in the ICMP payload */
1010 ip = (union swrap_packet_ip *)buf;
1011 ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
1012 ip->v4.tos = 0x00;
1013 ip->v4.packet_length = htons(wire_len - icmp_hdr_len);
1014 ip->v4.identification = htons(0xFFFF);
1015 ip->v4.flags = 0x40; /* BIT 1 set - means don't fraqment */
1016 ip->v4.fragment = htons(0x0000);
1017 ip->v4.ttl = 0xFF;
1018 ip->v4.protocol = icmp_protocol;
1019 ip->v4.hdr_checksum = htons(0x0000);
1020 ip->v4.src_addr = dest_in->sin_addr.s_addr;
1021 ip->v4.dest_addr = src_in->sin_addr.s_addr;
1022 buf += SWRAP_PACKET_IP_V4_SIZE;
1023
1024 src_port = dest_in->sin_port;
1025 dest_port = src_in->sin_port;
1026 break;
1027 #ifdef HAVE_IPV6
1028 case AF_INET6:
1029 pay->icmp6.type = 0x01; /* destination unreachable */
1030 pay->icmp6.code = 0x03; /* address unreachable */
1031 pay->icmp6.checksum = htons(0x0000);
1032 pay->icmp6.unused = htonl(0x00000000);
1033 buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
1034
1035 /* set the ip header in the ICMP payload */
1036 ip = (union swrap_packet_ip *)buf;
1037 ip->v6.ver_prio = 0x60; /* version 4 and 5 * 32 bit words */
1038 ip->v6.flow_label_high = 0x00;
1039 ip->v6.flow_label_low = 0x0000;
1040 ip->v6.payload_length = htons(wire_len - icmp_truncate_len); /* TODO */
1041 ip->v6.next_header = protocol;
1042 memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
1043 memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
1044 buf += SWRAP_PACKET_IP_V6_SIZE;
1045
1046 src_port = dest_in6->sin6_port;
1047 dest_port = src_in6->sin6_port;
1048 break;
1049 #endif
1050 }
1051 }
1052
1053 pay = (union swrap_packet_payload *)buf;
1054
1055 switch (socket_type) {
1056 case SOCK_STREAM:
1057 pay->tcp.source_port = src_port;
1058 pay->tcp.dest_port = dest_port;
1059 pay->tcp.seq_num = htonl(tcp_seqno);
1060 pay->tcp.ack_num = htonl(tcp_ack);
1061 pay->tcp.hdr_length = 0x50; /* 5 * 32 bit words */
1062 pay->tcp.control = tcp_ctl;
1063 pay->tcp.window = htons(0x7FFF);
1064 pay->tcp.checksum = htons(0x0000);
1065 pay->tcp.urg = htons(0x0000);
1066 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
1067
1068 break;
1069
1070 case SOCK_DGRAM:
1071 pay->udp.source_port = src_port;
1072 pay->udp.dest_port = dest_port;
1073 pay->udp.length = htons(8 + payload_len);
1074 pay->udp.checksum = htons(0x0000);
1075 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
1076
1077 break;
1078 }
1079
1080 if (payload && payload_len > 0) {
1081 memcpy(buf, payload, payload_len);
1082 }
1083
1084 *_packet_len = packet_len - icmp_truncate_len;
1085 return base;
1086 }
1087
1088 static int swrap_get_pcap_fd(const char *fname)
1089 {
1090 static int fd = -1;
1091
1092 if (fd != -1) return fd;
1093
1094 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1095 if (fd != -1) {
1096 struct swrap_file_hdr file_hdr;
1097 file_hdr.magic = 0xA1B2C3D4;
1098 file_hdr.version_major = 0x0002;
1099 file_hdr.version_minor = 0x0004;
1100 file_hdr.timezone = 0x00000000;
1101 file_hdr.sigfigs = 0x00000000;
1102 file_hdr.frame_max_len = SWRAP_FRAME_LENGTH_MAX;
1103 file_hdr.link_type = 0x0065; /* 101 RAW IP */
1104
1105 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1106 close(fd);
1107 fd = -1;
1108 }
1109 return fd;
1110 }
1111
1112 fd = open(fname, O_WRONLY|O_APPEND, 0644);
1113
1114 return fd;
1115 }
1116
1117 static uint8_t *swrap_marshall_packet(struct socket_info *si,
1118 const struct sockaddr *addr,
1119 enum swrap_packet_type type,
1120 const void *buf, size_t len,
1121 size_t *packet_len)
1122 {
1123 const struct sockaddr *src_addr;
1124 const struct sockaddr *dest_addr;
1125 unsigned long tcp_seqno = 0;
1126 unsigned long tcp_ack = 0;
1127 unsigned char tcp_ctl = 0;
1128 int unreachable = 0;
1129
1130 struct timeval tv;
1131
1132 switch (si->family) {
1133 case AF_INET:
1134 break;
1135 #ifdef HAVE_IPV6
1136 case AF_INET6:
1137 break;
1138 #endif
1139 default:
1140 return NULL;
1141 }
1142
1143 switch (type) {
1144 case SWRAP_CONNECT_SEND:
1145 if (si->type != SOCK_STREAM) return NULL;
1146
1147 src_addr = si->myname;
1148 dest_addr = addr;
1149
1150 tcp_seqno = si->io.pck_snd;
1151 tcp_ack = si->io.pck_rcv;
1152 tcp_ctl = 0x02; /* SYN */
1153
1154 si->io.pck_snd += 1;
1155
1156 break;
1157
1158 case SWRAP_CONNECT_RECV:
1159 if (si->type != SOCK_STREAM) return NULL;
1160
1161 dest_addr = si->myname;
1162 src_addr = addr;
1163
1164 tcp_seqno = si->io.pck_rcv;
1165 tcp_ack = si->io.pck_snd;
1166 tcp_ctl = 0x12; /** SYN,ACK */
1167
1168 si->io.pck_rcv += 1;
1169
1170 break;
1171
1172 case SWRAP_CONNECT_UNREACH:
1173 if (si->type != SOCK_STREAM) return NULL;
1174
1175 dest_addr = si->myname;
1176 src_addr = addr;
1177
1178 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
1179 tcp_seqno = si->io.pck_snd - 1;
1180 tcp_ack = si->io.pck_rcv;
1181 tcp_ctl = 0x02; /* SYN */
1182 unreachable = 1;
1183
1184 break;
1185
1186 case SWRAP_CONNECT_ACK:
1187 if (si->type != SOCK_STREAM) return NULL;
1188
1189 src_addr = si->myname;
1190 dest_addr = addr;
1191
1192 tcp_seqno = si->io.pck_snd;
1193 tcp_ack = si->io.pck_rcv;
1194 tcp_ctl = 0x10; /* ACK */
1195
1196 break;
1197
1198 case SWRAP_ACCEPT_SEND:
1199 if (si->type != SOCK_STREAM) return NULL;
1200
1201 dest_addr = si->myname;
1202 src_addr = addr;
1203
1204 tcp_seqno = si->io.pck_rcv;
1205 tcp_ack = si->io.pck_snd;
1206 tcp_ctl = 0x02; /* SYN */
1207
1208 si->io.pck_rcv += 1;
1209
1210 break;
1211
1212 case SWRAP_ACCEPT_RECV:
1213 if (si->type != SOCK_STREAM) return NULL;
1214
1215 src_addr = si->myname;
1216 dest_addr = addr;
1217
1218 tcp_seqno = si->io.pck_snd;
1219 tcp_ack = si->io.pck_rcv;
1220 tcp_ctl = 0x12; /* SYN,ACK */
1221
1222 si->io.pck_snd += 1;
1223
1224 break;
1225
1226 case SWRAP_ACCEPT_ACK:
1227 if (si->type != SOCK_STREAM) return NULL;
1228
1229 dest_addr = si->myname;
1230 src_addr = addr;
1231
1232 tcp_seqno = si->io.pck_rcv;
1233 tcp_ack = si->io.pck_snd;
1234 tcp_ctl = 0x10; /* ACK */
1235
1236 break;
1237
1238 case SWRAP_SEND:
1239 src_addr = si->myname;
1240 dest_addr = si->peername;
1241
1242 tcp_seqno = si->io.pck_snd;
1243 tcp_ack = si->io.pck_rcv;
1244 tcp_ctl = 0x18; /* PSH,ACK */
1245
1246 si->io.pck_snd += len;
1247
1248 break;
1249
1250 case SWRAP_SEND_RST:
1251 dest_addr = si->myname;
1252 src_addr = si->peername;
1253
1254 if (si->type == SOCK_DGRAM) {
1255 return swrap_marshall_packet(si, si->peername,
1256 SWRAP_SENDTO_UNREACH,
1257 buf, len, packet_len);
1258 }
1259
1260 tcp_seqno = si->io.pck_rcv;
1261 tcp_ack = si->io.pck_snd;
1262 tcp_ctl = 0x14; /** RST,ACK */
1263
1264 break;
1265
1266 case SWRAP_PENDING_RST:
1267 dest_addr = si->myname;
1268 src_addr = si->peername;
1269
1270 if (si->type == SOCK_DGRAM) {
1271 return NULL;
1272 }
1273
1274 tcp_seqno = si->io.pck_rcv;
1275 tcp_ack = si->io.pck_snd;
1276 tcp_ctl = 0x14; /* RST,ACK */
1277
1278 break;
1279
1280 case SWRAP_RECV:
1281 dest_addr = si->myname;
1282 src_addr = si->peername;
1283
1284 tcp_seqno = si->io.pck_rcv;
1285 tcp_ack = si->io.pck_snd;
1286 tcp_ctl = 0x18; /* PSH,ACK */
1287
1288 si->io.pck_rcv += len;
1289
1290 break;
1291
1292 case SWRAP_RECV_RST:
1293 dest_addr = si->myname;
1294 src_addr = si->peername;
1295
1296 if (si->type == SOCK_DGRAM) {
1297 return NULL;
1298 }
1299
1300 tcp_seqno = si->io.pck_rcv;
1301 tcp_ack = si->io.pck_snd;
1302 tcp_ctl = 0x14; /* RST,ACK */
1303
1304 break;
1305
1306 case SWRAP_SENDTO:
1307 src_addr = si->myname;
1308 dest_addr = addr;
1309
1310 si->io.pck_snd += len;
1311
1312 break;
1313
1314 case SWRAP_SENDTO_UNREACH:
1315 dest_addr = si->myname;
1316 src_addr = addr;
1317
1318 unreachable = 1;
1319
1320 break;
1321
1322 case SWRAP_RECVFROM:
1323 dest_addr = si->myname;
1324 src_addr = addr;
1325
1326 si->io.pck_rcv += len;
1327
1328 break;
1329
1330 case SWRAP_CLOSE_SEND:
1331 if (si->type != SOCK_STREAM) return NULL;
1332
1333 src_addr = si->myname;
1334 dest_addr = si->peername;
1335
1336 tcp_seqno = si->io.pck_snd;
1337 tcp_ack = si->io.pck_rcv;
1338 tcp_ctl = 0x11; /* FIN, ACK */
1339
1340 si->io.pck_snd += 1;
1341
1342 break;
1343
1344 case SWRAP_CLOSE_RECV:
1345 if (si->type != SOCK_STREAM) return NULL;
1346
1347 dest_addr = si->myname;
1348 src_addr = si->peername;
1349
1350 tcp_seqno = si->io.pck_rcv;
1351 tcp_ack = si->io.pck_snd;
1352 tcp_ctl = 0x11; /* FIN,ACK */
1353
1354 si->io.pck_rcv += 1;
1355
1356 break;
1357
1358 case SWRAP_CLOSE_ACK:
1359 if (si->type != SOCK_STREAM) return NULL;
1360
1361 src_addr = si->myname;
1362 dest_addr = si->peername;
1363
1364 tcp_seqno = si->io.pck_snd;
1365 tcp_ack = si->io.pck_rcv;
1366 tcp_ctl = 0x10; /* ACK */
1367
1368 break;
1369 default:
1370 return NULL;
1371 }
1372
1373 swrapGetTimeOfDay(&tv);
1374
1375 return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1376 (const uint8_t *)buf, len,
1377 tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1378 packet_len);
1379 }
1380
1381 static void swrap_dump_packet(struct socket_info *si,
1382 const struct sockaddr *addr,
1383 enum swrap_packet_type type,
1384 const void *buf, size_t len)
1385 {
1386 const char *file_name;
1387 uint8_t *packet;
1388 size_t packet_len = 0;
1389 int fd;
1390
1391 file_name = socket_wrapper_pcap_file();
1392 if (!file_name) {
1393 return;
1394 }
1395
1396 packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1397 if (!packet) {
1398 return;
1399 }
1400
1401 fd = swrap_get_pcap_fd(file_name);
1402 if (fd != -1) {
1403 if (write(fd, packet, packet_len) != packet_len) {
1404 free(packet);
1405 return;
1406 }
1407 }
1408
1409 free(packet);
1410 }
1411
1412 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
1413 {
1414 struct socket_info *si;
1415 struct socket_info_fd *fi;
1416 int fd;
1417 int real_type = type;
1418 #ifdef SOCK_CLOEXEC
1419 real_type &= ~SOCK_CLOEXEC;
1420 #endif
1421 #ifdef SOCK_NONBLOCK
1422 real_type &= ~SOCK_NONBLOCK;
1423 #endif
1424
1425 if (!socket_wrapper_dir()) {
1426 return real_socket(family, type, protocol);
1427 }
1428
1429 switch (family) {
1430 case AF_INET:
1431 #ifdef HAVE_IPV6
1432 case AF_INET6:
1433 #endif
1434 break;
1435 case AF_UNIX:
1436 return real_socket(family, type, protocol);
1437 default:
1438 errno = EAFNOSUPPORT;
1439 return -1;
1440 }
1441
1442 switch (real_type) {
1443 case SOCK_STREAM:
1444 break;
1445 case SOCK_DGRAM:
1446 break;
1447 default:
1448 errno = EPROTONOSUPPORT;
1449 return -1;
1450 }
1451
1452 switch (protocol) {
1453 case 0:
1454 break;
1455 case 6:
1456 if (real_type == SOCK_STREAM) {
1457 break;
1458 }
1459 /*fall through*/
1460 case 17:
1461 if (real_type == SOCK_DGRAM) {
1462 break;
1463 }
1464 /*fall through*/
1465 default:
1466 errno = EPROTONOSUPPORT;
1467 return -1;
1468 }
1469
1470 /* We must call real_socket with type, from the caller, not the version we removed
1471 SOCK_CLOEXEC and SOCK_NONBLOCK from */
1472 fd = real_socket(AF_UNIX, type, 0);
1473
1474 if (fd == -1) return -1;
1475
1476 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1477 if (si == NULL) {
1478 errno = ENOMEM;
1479 return -1;
1480 }
1481
1482 si->family = family;
1483
1484 /* however, the rest of the socket_wrapper code expects just
1485 * the type, not the flags */
1486 si->type = real_type;
1487 si->protocol = protocol;
1488
1489 fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
1490 if (fi == NULL) {
1491 free(si);
1492 errno = ENOMEM;
1493 return -1;
1494 }
1495
1496 fi->fd = fd;
1497
1498 SWRAP_DLIST_ADD(si->fds, fi);
1499 SWRAP_DLIST_ADD(sockets, si);
1500
1501 return fd;
1502 }
1503
1504 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1505 {
1506 struct socket_info *parent_si, *child_si;
1507 struct socket_info_fd *child_fi;
1508 int fd;
1509 struct sockaddr_un un_addr;
1510 socklen_t un_addrlen = sizeof(un_addr);
1511 struct sockaddr_un un_my_addr;
1512 socklen_t un_my_addrlen = sizeof(un_my_addr);
1513 struct sockaddr *my_addr;
1514 socklen_t my_addrlen, len;
1515 int ret;
1516
1517 parent_si = find_socket_info(s);
1518 if (!parent_si) {
1519 return real_accept(s, addr, addrlen);
1520 }
1521
1522 /*
1523 * assume out sockaddr have the same size as the in parent
1524 * socket family
1525 */
1526 my_addrlen = socket_length(parent_si->family);
1527 if (my_addrlen <= 0) {
1528 errno = EINVAL;
1529 return -1;
1530 }
1531
1532 my_addr = (struct sockaddr *)malloc(my_addrlen);
1533 if (my_addr == NULL) {
1534 return -1;
1535 }
1536
1537 memset(&un_addr, 0, sizeof(un_addr));
1538 memset(&un_my_addr, 0, sizeof(un_my_addr));
1539
1540 ret = real_accept(s, (struct sockaddr *)(void *)&un_addr, &un_addrlen);
1541 if (ret == -1) {
1542 free(my_addr);
1543 return ret;
1544 }
1545
1546 fd = ret;
1547
1548 len = my_addrlen;
1549 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1550 parent_si->family, my_addr, &len);
1551 if (ret == -1) {
1552 free(my_addr);
1553 close(fd);
1554 return ret;
1555 }
1556
1557 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1558 memset(child_si, 0, sizeof(*child_si));
1559
1560 child_fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
1561 if (child_fi == NULL) {
1562 free(child_si);
1563 free(my_addr);
1564 close(fd);
1565 errno = ENOMEM;
1566 return -1;
1567 }
1568
1569 child_fi->fd = fd;
1570
1571 SWRAP_DLIST_ADD(child_si->fds, child_fi);
1572
1573 child_si->family = parent_si->family;
1574 child_si->type = parent_si->type;
1575 child_si->protocol = parent_si->protocol;
1576 child_si->bound = 1;
1577 child_si->is_server = 1;
1578 child_si->connected = 1;
1579
1580 child_si->peername_len = len;
1581 child_si->peername = sockaddr_dup(my_addr, len);
1582
1583 if (addr != NULL && addrlen != NULL) {
1584 size_t copy_len = MIN(*addrlen, len);
1585 if (copy_len > 0) {
1586 memcpy(addr, my_addr, copy_len);
1587 }
1588 *addrlen = len;
1589 }
1590
1591 ret = real_getsockname(fd, (struct sockaddr *)(void *)&un_my_addr,
1592 &un_my_addrlen);
1593 if (ret == -1) {
1594 free(child_fi);
1595 free(child_si);
1596 close(fd);
1597 return ret;
1598 }
1599
1600 len = my_addrlen;
1601 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1602 child_si->family, my_addr, &len);
1603 if (ret == -1) {
1604 free(child_fi);
1605 free(child_si);
1606 free(my_addr);
1607 close(fd);
1608 return ret;
1609 }
1610
1611 child_si->myname_len = len;
1612 child_si->myname = sockaddr_dup(my_addr, len);
1613 free(my_addr);
1614
1615 SWRAP_DLIST_ADD(sockets, child_si);
1616
1617 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1618 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1619 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1620
1621 return fd;
1622 }
1623
1624 static int autobind_start_init;
1625 static int autobind_start;
1626
1627 /* using sendto() or connect() on an unbound socket would give the
1628 recipient no way to reply, as unlike UDP and TCP, a unix domain
1629 socket can't auto-assign emphemeral port numbers, so we need to
1630 assign it here.
1631 Note: this might change the family from ipv6 to ipv4
1632 */
1633 static int swrap_auto_bind(int fd, struct socket_info *si, int family)
1634 {
1635 struct sockaddr_un un_addr;
1636 int i;
1637 char type;
1638 int ret;
1639 int port;
1640 struct stat st;
1641
1642 if (autobind_start_init != 1) {
1643 autobind_start_init = 1;
1644 autobind_start = getpid();
1645 autobind_start %= 50000;
1646 autobind_start += 10000;
1647 }
1648
1649 un_addr.sun_family = AF_UNIX;
1650
1651 switch (family) {
1652 case AF_INET: {
1653 struct sockaddr_in in;
1654
1655 switch (si->type) {
1656 case SOCK_STREAM:
1657 type = SOCKET_TYPE_CHAR_TCP;
1658 break;
1659 case SOCK_DGRAM:
1660 type = SOCKET_TYPE_CHAR_UDP;
1661 break;
1662 default:
1663 errno = ESOCKTNOSUPPORT;
1664 return -1;
1665 }
1666
1667 memset(&in, 0, sizeof(in));
1668 in.sin_family = AF_INET;
1669 in.sin_addr.s_addr = htonl(127<<24 |
1670 socket_wrapper_default_iface());
1671
1672 si->myname_len = sizeof(in);
1673 si->myname = sockaddr_dup(&in, si->myname_len);
1674 break;
1675 }
1676 #ifdef HAVE_IPV6
1677 case AF_INET6: {
1678 struct sockaddr_in6 in6;
1679
1680 if (si->family != family) {
1681 errno = ENETUNREACH;
1682 return -1;
1683 }
1684
1685 switch (si->type) {
1686 case SOCK_STREAM:
1687 type = SOCKET_TYPE_CHAR_TCP_V6;
1688 break;
1689 case SOCK_DGRAM:
1690 type = SOCKET_TYPE_CHAR_UDP_V6;
1691 break;
1692 default:
1693 errno = ESOCKTNOSUPPORT;
1694 return -1;
1695 }
1696
1697 memset(&in6, 0, sizeof(in6));
1698 in6.sin6_family = AF_INET6;
1699 in6.sin6_addr = *swrap_ipv6();
1700 in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
1701 si->myname_len = sizeof(in6);
1702 si->myname = sockaddr_dup(&in6, si->myname_len);
1703 break;
1704 }
1705 #endif
1706 default:
1707 errno = ESOCKTNOSUPPORT;
1708 return -1;
1709 }
1710
1711 if (autobind_start > 60000) {
1712 autobind_start = 10000;
1713 }
1714
1715 for (i=0;i<1000;i++) {
1716 port = autobind_start + i;
1717 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1718 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1719 type, socket_wrapper_default_iface(), port);
1720 if (stat(un_addr.sun_path, &st) == 0) continue;
1721
1722 ret = real_bind(fd, (struct sockaddr *)(void *)&un_addr,
1723 sizeof(un_addr));
1724 if (ret == -1) return ret;
1725
1726 si->tmp_path = strdup(un_addr.sun_path);
1727 si->bound = 1;
1728 autobind_start = port + 1;
1729 break;
1730 }
1731 if (i == 1000) {
1732 errno = ENFILE;
1733 return -1;
1734 }
1735
1736 si->family = family;
1737 set_port(si->family, port, si->myname);
1738
1739 return 0;
1740 }
1741
1742
1743 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1744 {
1745 int ret;
1746 struct sockaddr_un un_addr;
1747 struct socket_info *si = find_socket_info(s);
1748 int bcast = 0;
1749
1750 if (!si) {
1751 return real_connect(s, serv_addr, addrlen);
1752 }
1753
1754 if (si->bound == 0) {
1755 ret = swrap_auto_bind(s, si, serv_addr->sa_family);
1756 if (ret == -1) return -1;
1757 }
1758
1759 if (si->family != serv_addr->sa_family) {
1760 errno = EINVAL;
1761 return -1;
1762 }
1763
1764 ret = sockaddr_convert_to_un(si, serv_addr,
1765 addrlen, &un_addr, 0, &bcast);
1766 if (ret == -1) return -1;
1767
1768 if (bcast) {
1769 errno = ENETUNREACH;
1770 return -1;
1771 }
1772
1773 if (si->type == SOCK_DGRAM) {
1774 si->defer_connect = 1;
1775 ret = 0;
1776 } else {
1777 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1778
1779 ret = real_connect(s, (struct sockaddr *)(void *)&un_addr,
1780 sizeof(struct sockaddr_un));
1781 }
1782
1783 /* to give better errors */
1784 if (ret == -1 && errno == ENOENT) {
1785 errno = EHOSTUNREACH;
1786 }
1787
1788 if (ret == 0) {
1789 si->peername_len = addrlen;
1790 si->peername = sockaddr_dup(serv_addr, addrlen);
1791 si->connected = 1;
1792
1793 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1794 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1795 } else {
1796 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1797 }
1798
1799 return ret;
1800 }
1801
1802 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1803 {
1804 int ret;
1805 struct sockaddr_un un_addr;
1806 struct socket_info *si = find_socket_info(s);
1807
1808 if (!si) {
1809 return real_bind(s, myaddr, addrlen);
1810 }
1811
1812 si->myname_len = addrlen;
1813 si->myname = sockaddr_dup(myaddr, addrlen);
1814
1815 ret = sockaddr_convert_to_un(si, myaddr, addrlen, &un_addr, 1, &si->bcast);
1816 if (ret == -1) return -1;
1817
1818 unlink(un_addr.sun_path);
1819
1820 ret = real_bind(s, (struct sockaddr *)(void *)&un_addr,
1821 sizeof(struct sockaddr_un));
1822
1823 if (ret == 0) {
1824 si->bound = 1;
1825 }
1826
1827 return ret;
1828 }
1829
1830 _PUBLIC_ int swrap_listen(int s, int backlog)
1831 {
1832 int ret;
1833 struct socket_info *si = find_socket_info(s);
1834
1835 if (!si) {
1836 return real_listen(s, backlog);
1837 }
1838
1839 ret = real_listen(s, backlog);
1840
1841 return ret;
1842 }
1843
1844 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1845 {
1846 struct socket_info *si = find_socket_info(s);
1847
1848 if (!si) {
1849 return real_getpeername(s, name, addrlen);
1850 }
1851
1852 if (!si->peername)
1853 {
1854 errno = ENOTCONN;
1855 return -1;
1856 }
1857
1858 memcpy(name, si->peername, si->peername_len);
1859 *addrlen = si->peername_len;
1860
1861 return 0;
1862 }
1863
1864 _PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1865 {
1866 struct socket_info *si = find_socket_info(s);
1867
1868 if (!si) {
1869 return real_getsockname(s, name, addrlen);
1870 }
1871
1872 memcpy(name, si->myname, si->myname_len);
1873 *addrlen = si->myname_len;
1874
1875 return 0;
1876 }
1877
1878 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1879 {
1880 struct socket_info *si = find_socket_info(s);
1881
1882 if (!si) {
1883 return real_getsockopt(s, level, optname, optval, optlen);
1884 }
1885
1886 if (level == SOL_SOCKET) {
1887 return real_getsockopt(s, level, optname, optval, optlen);
1888 }
1889
1890 errno = ENOPROTOOPT;
1891 return -1;
1892 }
1893
1894 _PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1895 {
1896 struct socket_info *si = find_socket_info(s);
1897
1898 if (!si) {
1899 return real_setsockopt(s, level, optname, optval, optlen);
1900 }
1901
1902 if (level == SOL_SOCKET) {
1903 return real_setsockopt(s, level, optname, optval, optlen);
1904 }
1905
1906 switch (si->family) {
1907 case AF_INET:
1908 return 0;
1909 #ifdef HAVE_IPV6
1910 case AF_INET6:
1911 return 0;
1912 #endif
1913 default:
1914 errno = ENOPROTOOPT;
1915 return -1;
1916 }
1917 }
1918
1919 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1920 {
1921 int ret;
1922 struct socket_info *si = find_socket_info(s);
1923 int value;
1924
1925 if (!si) {
1926 return real_ioctl(s, r, p);
1927 }
1928
1929 ret = real_ioctl(s, r, p);
1930
1931 switch (r) {
1932 case FIONREAD:
1933 value = *((int *)p);
1934 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1935 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1936 } else if (value == 0) { /* END OF FILE */
1937 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1938 }
1939 break;
1940 }
1941
1942 return ret;
1943 }
1944
1945 static ssize_t swrap_sendmsg_before(int fd,
1946 struct socket_info *si,
1947 struct msghdr *msg,
1948 struct iovec *tmp_iov,
1949 struct sockaddr_un *tmp_un,
1950 const struct sockaddr_un **to_un,
1951 const struct sockaddr **to,
1952 int *bcast)
1953 {
1954 size_t i, len = 0;
1955 ssize_t ret;
1956
1957 if (to_un) {
1958 *to_un = NULL;
1959 }
1960 if (to) {
1961 *to = NULL;
1962 }
1963 if (bcast) {
1964 *bcast = 0;
1965 }
1966
1967 switch (si->type) {
1968 case SOCK_STREAM:
1969 if (!si->connected) {
1970 errno = ENOTCONN;
1971 return -1;
1972 }
1973
1974 if (msg->msg_iovlen == 0) {
1975 break;
1976 }
1977
1978 /*
1979 * cut down to 1500 byte packets for stream sockets,
1980 * which makes it easier to format PCAP capture files
1981 * (as the caller will simply continue from here)
1982 */
1983
1984 for (i=0; i < msg->msg_iovlen; i++) {
1985 size_t nlen;
1986 nlen = len + msg->msg_iov[i].iov_len;
1987 if (nlen > 1500) {
1988 break;
1989 }
1990 }
1991 msg->msg_iovlen = i;
1992 if (msg->msg_iovlen == 0) {
1993 *tmp_iov = msg->msg_iov[0];
1994 tmp_iov->iov_len = MIN(tmp_iov->iov_len, 1500);
1995 msg->msg_iov = tmp_iov;
1996 msg->msg_iovlen = 1;
1997 }
1998 break;
1999
2000 case SOCK_DGRAM:
2001 if (si->connected) {
2002 if (msg->msg_name) {
2003 errno = EISCONN;
2004 return -1;
2005 }
2006 } else {
2007 const struct sockaddr *msg_name;
2008 msg_name = (const struct sockaddr *)msg->msg_name;
2009
2010 if (msg_name == NULL) {
2011 errno = ENOTCONN;
2012 return -1;
2013 }
2014
2015
2016 ret = sockaddr_convert_to_un(si, msg_name, msg->msg_namelen,
2017 tmp_un, 0, bcast);
2018 if (ret == -1) return -1;
2019
2020 if (to_un) {
2021 *to_un = tmp_un;
2022 }
2023 if (to) {
2024 *to = msg_name;
2025 }
2026 msg->msg_name = tmp_un;
2027 msg->msg_namelen = sizeof(*tmp_un);
2028 }
2029
2030 if (si->bound == 0) {
2031 ret = swrap_auto_bind(fd, si, si->family);
2032 if (ret == -1) return -1;
2033 }
2034
2035 if (!si->defer_connect) {
2036 break;
2037 }
2038
2039 ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
2040 tmp_un, 0, NULL);
2041 if (ret == -1) return -1;
2042
2043 ret = real_connect(fd, (struct sockaddr *)(void *)tmp_un,
2044 sizeof(*tmp_un));
2045
2046 /* to give better errors */
2047 if (ret == -1 && errno == ENOENT) {
2048 errno = EHOSTUNREACH;
2049 }
2050
2051 if (ret == -1) {
2052 return ret;
2053 }
2054
2055 si->defer_connect = 0;
2056 break;
2057 default:
2058 errno = EHOSTUNREACH;
2059 return -1;
2060 }
2061
2062 return 0;
2063 }
2064
2065 static void swrap_sendmsg_after(struct socket_info *si,
2066 struct msghdr *msg,
2067 const struct sockaddr *to,
2068 ssize_t ret)
2069 {
2070 int saved_errno = errno;
2071 size_t i, len = 0;
2072 uint8_t *buf;
2073 off_t ofs = 0;
2074 size_t avail = 0;
2075 size_t remain;
2076
2077 /* to give better errors */
2078 if (ret == -1 && saved_errno == ENOENT) {
2079 saved_errno = EHOSTUNREACH;
2080 }
2081
2082 for (i=0; i < msg->msg_iovlen; i++) {
2083 avail += msg->msg_iov[i].iov_len;
2084 }
2085
2086 if (ret == -1) {
2087 remain = MIN(80, avail);
2088 } else {
2089 remain = ret;
2090 }
2091
2092 /* we capture it as one single packet */
2093 buf = (uint8_t *)malloc(remain);
2094 if (!buf) {
2095 /* we just not capture the packet */
2096 errno = saved_errno;
2097 return;
2098 }
2099
2100 for (i=0; i < msg->msg_iovlen; i++) {
2101 size_t this_time = MIN(remain, msg->msg_iov[i].iov_len);
2102 memcpy(buf + ofs,
2103 msg->msg_iov[i].iov_base,
2104 this_time);
2105 ofs += this_time;
2106 remain -= this_time;
2107 }
2108 len = ofs;
2109
2110 switch (si->type) {
2111 case SOCK_STREAM:
2112 if (ret == -1) {
2113 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2114 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
2115 } else {
2116 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
2117 }
2118 break;
2119
2120 case SOCK_DGRAM:
2121 if (si->connected) {
2122 to = si->peername;
2123 }
2124 if (ret == -1) {
2125 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2126 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
2127 } else {
2128 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2129 }
2130 break;
2131 }
2132
2133 free(buf);
2134 errno = saved_errno;
2135 }
2136
2137 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
2138 {
2139 struct sockaddr_un un_addr;
2140 socklen_t un_addrlen = sizeof(un_addr);
2141 int ret;
2142 struct socket_info *si = find_socket_info(s);
2143 struct sockaddr_storage ss;
2144 socklen_t ss_len = sizeof(ss);
2145
2146 if (!si) {
2147 return real_recvfrom(s, buf, len, flags, from, fromlen);
2148 }
2149
2150 if (!from) {
2151 from = (struct sockaddr *)(void *)&ss;
2152 fromlen = &ss_len;
2153 }
2154
2155 if (si->type == SOCK_STREAM) {
2156 /* cut down to 1500 byte packets for stream sockets,
2157 * which makes it easier to format PCAP capture files
2158 * (as the caller will simply continue from here) */
2159 len = MIN(len, 1500);
2160 }
2161
2162 /* irix 6.4 forgets to null terminate the sun_path string :-( */
2163 memset(&un_addr, 0, sizeof(un_addr));
2164 ret = real_recvfrom(s, buf, len, flags,
2165 (struct sockaddr *)(void *)&un_addr, &un_addrlen);
2166 if (ret == -1)
2167 return ret;
2168
2169 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
2170 si->family, from, fromlen) == -1) {
2171 return -1;
2172 }
2173
2174 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
2175
2176 return ret;
2177 }
2178
2179
2180 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
2181 {
2182 struct msghdr msg;
2183 struct iovec tmp;
2184 struct sockaddr_un un_addr;
2185 const struct sockaddr_un *to_un = NULL;
2186 ssize_t ret;
2187 struct socket_info *si = find_socket_info(s);
2188 int bcast = 0;
2189
2190 if (!si) {
2191 return real_sendto(s, buf, len, flags, to, tolen);
2192 }
2193
2194 tmp.iov_base = discard_const_p(char, buf);
2195 tmp.iov_len = len;
2196
2197 ZERO_STRUCT(msg);
2198 msg.msg_name = discard_const_p(struct sockaddr, to); /* optional address */
2199 msg.msg_namelen = tolen; /* size of address */
2200 msg.msg_iov = &tmp; /* scatter/gather array */
2201 msg.msg_iovlen = 1; /* # elements in msg_iov */
2202 #if 0 /* not available on solaris */
2203 msg.msg_control = NULL; /* ancillary data, see below */
2204 msg.msg_controllen = 0; /* ancillary data buffer len */
2205 msg.msg_flags = 0; /* flags on received message */
2206 #endif
2207
2208 ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
2209 if (ret == -1) return -1;
2210
2211 buf = msg.msg_iov[0].iov_base;
2212 len = msg.msg_iov[0].iov_len;
2213
2214 if (bcast) {
2215 struct stat st;
2216 unsigned int iface;
2217 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
2218 char type;
2219
2220 type = SOCKET_TYPE_CHAR_UDP;
2221
2222 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
2223 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
2224 socket_wrapper_dir(), type, iface, prt);
2225 if (stat(un_addr.sun_path, &st) != 0) continue;
2226
2227 /* ignore the any errors in broadcast sends */
2228 real_sendto(s, buf, len, flags,
2229 (struct sockaddr *)(void *)&un_addr,
2230 sizeof(un_addr));
2231 }
2232
2233 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2234
2235 return len;
2236 }
2237
2238 ret = real_sendto(s, buf, len, flags, (struct sockaddr *)msg.msg_name,
2239 msg.msg_namelen);
2240
2241 swrap_sendmsg_after(si, &msg, to, ret);
2242
2243 return ret;
2244 }
2245
2246 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
2247 {
2248 int ret;
2249 struct socket_info *si = find_socket_info(s);
2250
2251 if (!si) {
2252 return real_recv(s, buf, len, flags);
2253 }
2254
2255 if (si->type == SOCK_STREAM) {
2256 /* cut down to 1500 byte packets for stream sockets,
2257 * which makes it easier to format PCAP capture files
2258 * (as the caller will simply continue from here) */
2259 len = MIN(len, 1500);
2260 }
2261
2262 ret = real_recv(s, buf, len, flags);
2263 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2264 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2265 } else if (ret == 0) { /* END OF FILE */
2266 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2267 } else if (ret > 0) {
2268 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2269 }
2270
2271 return ret;
2272 }
2273
2274 _PUBLIC_ ssize_t swrap_read(int s, void *buf, size_t len)
2275 {
2276 int ret;
2277 struct socket_info *si = find_socket_info(s);
2278
2279 if (!si) {
2280 return real_read(s, buf, len);
2281 }
2282
2283 if (si->type == SOCK_STREAM) {
2284 /* cut down to 1500 byte packets for stream sockets,
2285 * which makes it easier to format PCAP capture files
2286 * (as the caller will simply continue from here) */
2287 len = MIN(len, 1500);
2288 }
2289
2290 ret = real_read(s, buf, len);
2291 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2292 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2293 } else if (ret == 0) { /* END OF FILE */
2294 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2295 } else if (ret > 0) {
2296 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2297 }
2298
2299 return ret;
2300 }
2301
2302
2303 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
2304 {
2305 struct msghdr msg;
2306 struct iovec tmp;
2307 struct sockaddr_un un_addr;
2308 ssize_t ret;
2309 struct socket_info *si = find_socket_info(s);
2310
2311 if (!si) {
2312 return real_send(s, buf, len, flags);
2313 }
2314
2315 tmp.iov_base = discard_const_p(char, buf);
2316 tmp.iov_len = len;
2317
2318 ZERO_STRUCT(msg);
2319 msg.msg_name = NULL; /* optional address */
2320 msg.msg_namelen = 0; /* size of address */
2321 msg.msg_iov = &tmp; /* scatter/gather array */
2322 msg.msg_iovlen = 1; /* # elements in msg_iov */
2323 #if 0 /* not available on solaris */
2324 msg.msg_control = NULL; /* ancillary data, see below */
2325 msg.msg_controllen = 0; /* ancillary data buffer len */
2326 msg.msg_flags = 0; /* flags on received message */
2327 #endif
2328
2329 ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
2330 if (ret == -1) return -1;
2331
2332 buf = msg.msg_iov[0].iov_base;
2333 len = msg.msg_iov[0].iov_len;
2334
2335 ret = real_send(s, buf, len, flags);
2336
2337 swrap_sendmsg_after(si, &msg, NULL, ret);
2338
2339 return ret;
2340 }
2341
2342 _PUBLIC_ ssize_t swrap_sendmsg(int s, const struct msghdr *omsg, int flags)
2343 {
2344 struct msghdr msg;
2345 struct iovec tmp;
2346 struct sockaddr_un un_addr;
2347 const struct sockaddr_un *to_un = NULL;
2348 const struct sockaddr *to = NULL;
2349 ssize_t ret;
2350 struct socket_info *si = find_socket_info(s);
2351 int bcast = 0;
2352
2353 if (!si) {
2354 return real_sendmsg(s, omsg, flags);
2355 }
2356
2357 tmp.iov_base = NULL;
2358 tmp.iov_len = 0;
2359
2360 msg = *omsg;
2361 #if 0
2362 msg.msg_name = omsg->msg_name; /* optional address */
2363 msg.msg_namelen = omsg->msg_namelen; /* size of address */
2364 msg.msg_iov = omsg->msg_iov; /* scatter/gather array */
2365 msg.msg_iovlen = omsg->msg_iovlen; /* # elements in msg_iov */
2366 /* the following is not available on solaris */
2367 msg.msg_control = omsg->msg_control; /* ancillary data, see below */
2368 msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */
2369 msg.msg_flags = omsg->msg_flags; /* flags on received message */
2370 #endif
2371
2372 ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
2373 if (ret == -1) return -1;
2374
2375 if (bcast) {
2376 struct stat st;
2377 unsigned int iface;
2378 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
2379 char type;
2380 size_t i, len = 0;
2381 uint8_t *buf;
2382 off_t ofs = 0;
2383 size_t avail = 0;
2384 size_t remain;
2385
2386 for (i=0; i < msg.msg_iovlen; i++) {
2387 avail += msg.msg_iov[i].iov_len;
2388 }
2389
2390 len = avail;
2391 remain = avail;
2392
2393 /* we capture it as one single packet */
2394 buf = (uint8_t *)malloc(remain);
2395 if (!buf) {
2396 return -1;
2397 }
2398
2399 for (i=0; i < msg.msg_iovlen; i++) {
2400 size_t this_time = MIN(remain, msg.msg_iov[i].iov_len);
2401 memcpy(buf + ofs,
2402 msg.msg_iov[i].iov_base,
2403 this_time);
2404 ofs += this_time;
2405 remain -= this_time;
2406 }
2407
2408 type = SOCKET_TYPE_CHAR_UDP;
2409
2410 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
2411 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
2412 socket_wrapper_dir(), type, iface, prt);
2413 if (stat(un_addr.sun_path, &st) != 0) continue;
2414
2415 msg.msg_name = &un_addr; /* optional address */
2416 msg.msg_namelen = sizeof(un_addr); /* size of address */
2417
2418 /* ignore the any errors in broadcast sends */
2419 real_sendmsg(s, &msg, flags);
2420 }
2421
2422 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
2423 free(buf);
2424
2425 return len;
2426 }
2427
2428 ret = real_sendmsg(s, &msg, flags);
2429
2430 swrap_sendmsg_after(si, &msg, to, ret);
2431
2432 return ret;
2433 }
2434
2435 int swrap_readv(int s, const struct iovec *vector, size_t count)
2436 {
2437 int ret;
2438 struct socket_info *si = find_socket_info(s);
2439 struct iovec v;
2440
2441 if (!si) {
2442 return real_readv(s, vector, count);
2443 }
2444
2445 if (!si->connected) {
2446 errno = ENOTCONN;
2447 return -1;
2448 }
2449
2450 if (si->type == SOCK_STREAM && count > 0) {
2451 /* cut down to 1500 byte packets for stream sockets,
2452 * which makes it easier to format PCAP capture files
2453 * (as the caller will simply continue from here) */
2454 size_t i, len = 0;
2455
2456 for (i=0; i < count; i++) {
2457 size_t nlen;
2458 nlen = len + vector[i].iov_len;
2459 if (nlen > 1500) {
2460 break;
2461 }
2462 }
2463 count = i;
2464 if (count == 0) {
2465 v = vector[0];
2466 v.iov_len = MIN(v.iov_len, 1500);
2467 vector = &v;
2468 count = 1;
2469 }
2470 }
2471
2472 ret = real_readv(s, vector, count);
2473 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
2474 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2475 } else if (ret == 0) { /* END OF FILE */
2476 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
2477 } else if (ret > 0) {
2478 uint8_t *buf;
2479 off_t ofs = 0;
2480 size_t i;
2481 size_t remain = ret;
2482
2483 /* we capture it as one single packet */
2484 buf = (uint8_t *)malloc(ret);
2485 if (!buf) {
2486 /* we just not capture the packet */
2487 errno = 0;
2488 return ret;
2489 }
2490
2491 for (i=0; i < count; i++) {
2492 size_t this_time = MIN(remain, vector[i].iov_len);
2493 memcpy(buf + ofs,
2494 vector[i].iov_base,
2495 this_time);
2496 ofs += this_time;
2497 remain -= this_time;
2498 }
2499
2500 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
2501 free(buf);
2502 }
2503
2504 return ret;
2505 }
2506
2507 int swrap_writev(int s, const struct iovec *vector, size_t count)
2508 {
2509 struct msghdr msg;
2510 struct iovec tmp;
2511 struct sockaddr_un un_addr;
2512 ssize_t ret;
2513 struct socket_info *si = find_socket_info(s);
2514
2515 if (!si) {
2516 return real_writev(s, vector, count);
2517 }
2518
2519 tmp.iov_base = NULL;
2520 tmp.iov_len = 0;
2521
2522 ZERO_STRUCT(msg);
2523 msg.msg_name = NULL; /* optional address */
2524 msg.msg_namelen = 0; /* size of address */
2525 msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */
2526 msg.msg_iovlen = count; /* # elements in msg_iov */
2527 #if 0 /* not available on solaris */
2528 msg.msg_control = NULL; /* ancillary data, see below */
2529 msg.msg_controllen = 0; /* ancillary data buffer len */
2530 msg.msg_flags = 0; /* flags on received message */
2531 #endif
2532
2533 ret = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
2534 if (ret == -1) return -1;
2535
2536 ret = real_writev(s, msg.msg_iov, msg.msg_iovlen);
2537
2538 swrap_sendmsg_after(si, &msg, NULL, ret);
2539
2540 return ret;
2541 }
2542
2543 _PUBLIC_ int swrap_close(int fd)
2544 {
2545 struct socket_info *si = find_socket_info(fd);
2546 struct socket_info_fd *fi;
2547 int ret;
2548
2549 if (!si) {
2550 return real_close(fd);
2551 }
2552
2553 for (fi = si->fds; fi; fi = fi->next) {
2554 if (fi->fd == fd) {
2555 SWRAP_DLIST_REMOVE(si->fds, fi);
2556 free(fi);
2557 break;
2558 }
2559 }
2560
2561 if (si->fds) {
2562 /* there are still references left */
2563 return real_close(fd);
2564 }
2565
2566 SWRAP_DLIST_REMOVE(sockets, si);
2567
2568 if (si->myname && si->peername) {
2569 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
2570 }
2571
2572 ret = real_close(fd);
2573
2574 if (si->myname && si->peername) {
2575 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
2576 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
2577 }
2578
2579 if (si->myname) free(si->myname);
2580 if (si->peername) free(si->peername);
2581 if (si->tmp_path) {
2582 unlink(si->tmp_path);
2583 free(si->tmp_path);
2584 }
2585 free(si);
2586
2587 return ret;
2588 }
2589
2590 _PUBLIC_ int swrap_dup(int fd)
2591 {
2592 struct socket_info *si;
2593 struct socket_info_fd *fi;
2594
2595 si = find_socket_info(fd);
2596
2597 if (!si) {
2598 return real_dup(fd);
2599 }
2600
2601 fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
2602 if (fi == NULL) {
2603 errno = ENOMEM;
2604 return -1;
2605 }
2606
2607 fi->fd = real_dup(fd);
2608 if (fi->fd == -1) {
2609 int saved_errno = errno;
2610 free(fi);
2611 errno = saved_errno;
2612 return -1;
2613 }
2614
2615 SWRAP_DLIST_ADD(si->fds, fi);
2616 return fi->fd;
2617 }
2618
2619 _PUBLIC_ int swrap_dup2(int fd, int newfd)
2620 {
2621 struct socket_info *si;
2622 struct socket_info_fd *fi;
2623
2624 si = find_socket_info(fd);
2625
2626 if (!si) {
2627 return real_dup2(fd, newfd);
2628 }
2629
2630 if (find_socket_info(newfd)) {
2631 /* dup2() does an implicit close of newfd, which we
2632 * need to emulate */
2633 swrap_close(newfd);
2634 }
2635
2636 fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
2637 if (fi == NULL) {
2638 errno = ENOMEM;
2639 return -1;
2640 }
2641
2642 fi->fd = real_dup2(fd, newfd);
2643 if (fi->fd == -1) {
2644 int saved_errno = errno;
2645 free(fi);
2646 errno = saved_errno;
2647 return -1;
2648 }
2649
2650 SWRAP_DLIST_ADD(si->fds, fi);
2651 return fi->fd;
2652 }
reg import