2 Socket wrapper library. Passes all socket communication over
3 unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
5 Copyright (C) Jelmer Vernooij 2005
6 Copyright (C) Stefan Metzmacher 2006
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #define SOCKET_WRAPPER_NOT_REPLACE
27 #include "system/network.h"
28 #include "system/filesys.h"
31 #include "lib/util/dlinklist.h"
44 #else /* _SAMBA_BUILD_ */
46 #include <sys/types.h>
48 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <netinet/tcp.h>
58 #error "dlinklist.h missing"
62 /* LD_PRELOAD doesn't work yet, so REWRITE_CALLS is all we support
67 #define real_accept accept
68 #define real_connect connect
69 #define real_bind bind
70 #define real_listen listen
71 #define real_getpeername getpeername
72 #define real_getsockname getsockname
73 #define real_getsockopt getsockopt
74 #define real_setsockopt setsockopt
75 #define real_recvfrom recvfrom
76 #define real_sendto sendto
77 #define real_ioctl ioctl
78 #define real_recv recv
79 #define real_send send
80 #define real_socket socket
81 #define real_close close
84 /* we need to use a very terse format here as IRIX 6.4 silently
85 truncates names to 16 chars, so if we use a longer name then we
86 can't tell which port a packet came from with recvfrom()
88 with this format we have 8 chars left for the directory name
90 #define SOCKET_FORMAT "%c%02X%04X"
91 #define SOCKET_TYPE_CHAR_TCP 'T'
92 #define SOCKET_TYPE_CHAR_UDP 'U'
94 #define MAX_WRAPPED_INTERFACES 16
96 static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
98 struct sockaddr *ret = (struct sockaddr *)malloc(len);
99 memcpy(ret, data, len);
117 struct sockaddr *myname;
118 socklen_t myname_len;
120 struct sockaddr *peername;
121 socklen_t peername_len;
124 unsigned long pck_snd;
125 unsigned long pck_rcv;
128 struct socket_info *prev, *next;
131 static struct socket_info *sockets;
134 static const char *socket_wrapper_dir(void)
136 const char *s = getenv("SOCKET_WRAPPER_DIR");
140 if (strncmp(s, "./", 2) == 0) {
146 static const char *socket_wrapper_pcap_file(void)
148 const char *s = getenv("SOCKET_WRAPPER_PCAP_FILE");
153 if (strncmp(s, "./", 2) == 0) {
159 static unsigned int socket_wrapper_default_iface(void)
161 const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
164 if (sscanf(s, "%u", &iface) == 1) {
165 if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
171 return 1;/* 127.0.0.1 */
174 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr_in *in, socklen_t *len)
181 if ((*len) < sizeof(struct sockaddr_in)) {
185 p = strrchr(un->sun_path, '/');
186 if (p) p++; else p = un->sun_path;
188 if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
193 if (type != SOCKET_TYPE_CHAR_TCP && type != SOCKET_TYPE_CHAR_UDP) {
198 if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
208 in->sin_family = AF_INET;
209 in->sin_addr.s_addr = htonl((127<<24) | iface);
210 in->sin_port = htons(prt);
212 *len = sizeof(struct sockaddr_in);
216 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr_in *in, struct sockaddr_un *un,
223 unsigned int addr= ntohl(in->sin_addr.s_addr);
224 unsigned int prt = ntohs(in->sin_port);
228 if (bcast) *bcast = 0;
237 u_type = SOCKET_TYPE_CHAR_TCP;
240 u_type = SOCKET_TYPE_CHAR_UDP;
241 a_type = SOCKET_TYPE_CHAR_UDP;
242 b_type = SOCKET_TYPE_CHAR_UDP;
246 if (a_type && addr == 0xFFFFFFFF) {
247 /* 255.255.255.255 only udp */
250 iface = socket_wrapper_default_iface();
251 } else if (b_type && addr == 0x7FFFFFFF) {
252 /* 127.255.255.255 only udp */
255 iface = socket_wrapper_default_iface();
256 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
260 iface = (addr & 0x000000FF);
266 if (bcast) *bcast = is_bcast;
269 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
270 socket_wrapper_dir());
271 /* the caller need to do more processing */
275 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
276 socket_wrapper_dir(), type, iface, prt);
281 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr_in *in, struct sockaddr_un *un,
289 unsigned int addr= ntohl(in->sin_addr.s_addr);
290 unsigned int prt = ntohs(in->sin_port);
295 if (bcast) *bcast = 0;
299 u_type = SOCKET_TYPE_CHAR_TCP;
300 d_type = SOCKET_TYPE_CHAR_TCP;
303 u_type = SOCKET_TYPE_CHAR_UDP;
304 d_type = SOCKET_TYPE_CHAR_UDP;
305 a_type = SOCKET_TYPE_CHAR_UDP;
306 b_type = SOCKET_TYPE_CHAR_UDP;
314 iface = socket_wrapper_default_iface();
315 } else if (a_type && addr == 0xFFFFFFFF) {
316 /* 255.255.255.255 only udp */
319 iface = socket_wrapper_default_iface();
320 } else if (b_type && addr == 0x7FFFFFFF) {
321 /* 127.255.255.255 only udp */
324 iface = socket_wrapper_default_iface();
325 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
329 iface = (addr & 0x000000FF);
331 errno = EADDRNOTAVAIL;
335 if (bcast) *bcast = is_bcast;
338 /* handle auto-allocation of ephemeral ports */
339 for (prt = 5001; prt < 10000; prt++) {
340 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
341 socket_wrapper_dir(), type, iface, prt);
342 if (stat(un->sun_path, &st) == 0) continue;
344 ((struct sockaddr_in *)si->myname)->sin_port = htons(prt);
351 snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
352 socket_wrapper_dir(), type, iface, prt);
356 static struct socket_info *find_socket_info(int fd)
358 struct socket_info *i;
359 for (i = sockets; i; i = i->next) {
367 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
368 struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
373 out_addr->sun_family = AF_UNIX;
375 switch (in_addr->sa_family) {
382 errno = ESOCKTNOSUPPORT;
386 return convert_in_un_alloc(si, (const struct sockaddr_in *)in_addr, out_addr, bcast);
388 return convert_in_un_remote(si, (const struct sockaddr_in *)in_addr, out_addr, bcast);
394 errno = EAFNOSUPPORT;
398 static int sockaddr_convert_from_un(const struct socket_info *si,
399 const struct sockaddr_un *in_addr,
400 socklen_t un_addrlen,
402 struct sockaddr *out_addr,
403 socklen_t *_out_addrlen)
405 socklen_t out_addrlen;
407 if (out_addr == NULL || _out_addrlen == NULL)
410 if (un_addrlen == 0) {
415 out_addrlen = *_out_addrlen;
416 if (out_addrlen > un_addrlen) {
417 out_addrlen = un_addrlen;
427 errno = ESOCKTNOSUPPORT;
430 return convert_un_in(in_addr, (struct sockaddr_in *)out_addr, _out_addrlen);
435 errno = EAFNOSUPPORT;
439 enum swrap_packet_type {
441 SWRAP_CONNECT_UNREACH,
449 SWRAP_SENDTO_UNREACH,
460 static void swrap_dump_packet(struct socket_info *si, const struct sockaddr *addr,
461 enum swrap_packet_type type,
462 const void *buf, size_t len)
464 const struct sockaddr_in *src_addr;
465 const struct sockaddr_in *dest_addr;
466 const char *file_name;
467 unsigned long tcp_seq = 0;
468 unsigned long tcp_ack = 0;
469 unsigned char tcp_ctl = 0;
472 file_name = socket_wrapper_pcap_file();
477 if (si->family != AF_INET) {
482 case SWRAP_CONNECT_SEND:
483 if (si->type != SOCK_STREAM) return;
485 src_addr = (const struct sockaddr_in *)si->myname;
486 dest_addr = (const struct sockaddr_in *)addr;
488 tcp_seq = si->io.pck_snd;
489 tcp_ack = si->io.pck_rcv;
490 tcp_ctl = 0x02; /* SYN */
496 case SWRAP_CONNECT_RECV:
497 if (si->type != SOCK_STREAM) return;
499 dest_addr = (const struct sockaddr_in *)si->myname;
500 src_addr = (const struct sockaddr_in *)addr;
502 tcp_seq = si->io.pck_rcv;
503 tcp_ack = si->io.pck_snd;
504 tcp_ctl = 0x12; /** SYN,ACK */
510 case SWRAP_CONNECT_UNREACH:
511 if (si->type != SOCK_STREAM) return;
513 dest_addr = (const struct sockaddr_in *)si->myname;
514 src_addr = (const struct sockaddr_in *)addr;
516 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
517 tcp_seq = si->io.pck_snd - 1;
518 tcp_ack = si->io.pck_rcv;
519 tcp_ctl = 0x02; /* SYN */
524 case SWRAP_CONNECT_ACK:
525 if (si->type != SOCK_STREAM) return;
527 src_addr = (const struct sockaddr_in *)si->myname;
528 dest_addr = (const struct sockaddr_in *)addr;
530 tcp_seq = si->io.pck_snd;
531 tcp_ack = si->io.pck_rcv;
532 tcp_ctl = 0x10; /* ACK */
536 case SWRAP_ACCEPT_SEND:
537 if (si->type != SOCK_STREAM) return;
539 dest_addr = (const struct sockaddr_in *)si->myname;
540 src_addr = (const struct sockaddr_in *)addr;
542 tcp_seq = si->io.pck_rcv;
543 tcp_ack = si->io.pck_snd;
544 tcp_ctl = 0x02; /* SYN */
550 case SWRAP_ACCEPT_RECV:
551 if (si->type != SOCK_STREAM) return;
553 src_addr = (const struct sockaddr_in *)si->myname;
554 dest_addr = (const struct sockaddr_in *)addr;
556 tcp_seq = si->io.pck_snd;
557 tcp_ack = si->io.pck_rcv;
558 tcp_ctl = 0x12; /* SYN,ACK */
564 case SWRAP_ACCEPT_ACK:
565 if (si->type != SOCK_STREAM) return;
567 dest_addr = (const struct sockaddr_in *)si->myname;
568 src_addr = (const struct sockaddr_in *)addr;
570 tcp_seq = si->io.pck_rcv;
571 tcp_ack = si->io.pck_snd;
572 tcp_ctl = 0x10; /* ACK */
577 src_addr = (const struct sockaddr_in *)si->myname;
578 dest_addr = (const struct sockaddr_in *)si->peername;
580 tcp_seq = si->io.pck_snd;
581 tcp_ack = si->io.pck_rcv;
582 tcp_ctl = 0x18; /* PSH,ACK */
584 si->io.pck_snd += len;
589 dest_addr = (const struct sockaddr_in *)si->myname;
590 src_addr = (const struct sockaddr_in *)si->peername;
592 if (si->type == SOCK_DGRAM) {
593 swrap_dump_packet(si, si->peername,
594 SWRAP_SENDTO_UNREACH,
599 tcp_seq = si->io.pck_rcv;
600 tcp_ack = si->io.pck_snd;
601 tcp_ctl = 0x14; /** RST,ACK */
605 case SWRAP_PENDING_RST:
606 dest_addr = (const struct sockaddr_in *)si->myname;
607 src_addr = (const struct sockaddr_in *)si->peername;
609 if (si->type == SOCK_DGRAM) {
613 tcp_seq = si->io.pck_rcv;
614 tcp_ack = si->io.pck_snd;
615 tcp_ctl = 0x14; /* RST,ACK */
620 dest_addr = (const struct sockaddr_in *)si->myname;
621 src_addr = (const struct sockaddr_in *)si->peername;
623 tcp_seq = si->io.pck_rcv;
624 tcp_ack = si->io.pck_snd;
625 tcp_ctl = 0x18; /* PSH,ACK */
627 si->io.pck_rcv += len;
632 dest_addr = (const struct sockaddr_in *)si->myname;
633 src_addr = (const struct sockaddr_in *)si->peername;
635 if (si->type == SOCK_DGRAM) {
639 tcp_seq = si->io.pck_rcv;
640 tcp_ack = si->io.pck_snd;
641 tcp_ctl = 0x14; /* RST,ACK */
646 src_addr = (const struct sockaddr_in *)si->myname;
647 dest_addr = (const struct sockaddr_in *)addr;
649 si->io.pck_snd += len;
653 case SWRAP_SENDTO_UNREACH:
654 dest_addr = (const struct sockaddr_in *)si->myname;
655 src_addr = (const struct sockaddr_in *)addr;
662 dest_addr = (const struct sockaddr_in *)si->myname;
663 src_addr = (const struct sockaddr_in *)addr;
665 si->io.pck_rcv += len;
669 case SWRAP_CLOSE_SEND:
670 if (si->type != SOCK_STREAM) return;
672 src_addr = (const struct sockaddr_in *)si->myname;
673 dest_addr = (const struct sockaddr_in *)si->peername;
675 tcp_seq = si->io.pck_snd;
676 tcp_ack = si->io.pck_rcv;
677 tcp_ctl = 0x11; /* FIN, ACK */
683 case SWRAP_CLOSE_RECV:
684 if (si->type != SOCK_STREAM) return;
686 dest_addr = (const struct sockaddr_in *)si->myname;
687 src_addr = (const struct sockaddr_in *)si->peername;
689 tcp_seq = si->io.pck_rcv;
690 tcp_ack = si->io.pck_snd;
691 tcp_ctl = 0x11; /* FIN,ACK */
697 case SWRAP_CLOSE_ACK:
698 if (si->type != SOCK_STREAM) return;
700 src_addr = (const struct sockaddr_in *)si->myname;
701 dest_addr = (const struct sockaddr_in *)si->peername;
703 tcp_seq = si->io.pck_snd;
704 tcp_ack = si->io.pck_rcv;
705 tcp_ctl = 0x10; /* ACK */
710 /* TODO: contruct the blob and write to the file */
713 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
715 struct socket_info *si;
718 if (!socket_wrapper_dir()) {
719 return real_socket(family, type, protocol);
726 return real_socket(family, type, protocol);
728 errno = EAFNOSUPPORT;
738 errno = EPROTONOSUPPORT;
746 errno = EPROTONOSUPPORT;
750 fd = real_socket(AF_UNIX, type, 0);
752 if (fd == -1) return -1;
754 si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
758 si->protocol = protocol;
761 DLIST_ADD(sockets, si);
766 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
768 struct socket_info *parent_si, *child_si;
770 struct sockaddr_un un_addr;
771 socklen_t un_addrlen = sizeof(un_addr);
772 struct sockaddr_un un_my_addr;
773 socklen_t un_my_addrlen = sizeof(un_my_addr);
774 struct sockaddr my_addr;
775 socklen_t my_addrlen = sizeof(my_addr);
778 parent_si = find_socket_info(s);
780 return real_accept(s, addr, addrlen);
783 memset(&un_addr, 0, sizeof(un_addr));
784 memset(&un_my_addr, 0, sizeof(un_my_addr));
785 memset(&my_addr, 0, sizeof(my_addr));
787 ret = real_accept(s, (struct sockaddr *)&un_addr, &un_addrlen);
788 if (ret == -1) return ret;
792 ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
793 parent_si->family, addr, addrlen);
799 child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
800 memset(child_si, 0, sizeof(*child_si));
803 child_si->family = parent_si->family;
804 child_si->type = parent_si->type;
805 child_si->protocol = parent_si->protocol;
807 child_si->is_server = 1;
809 ret = real_getsockname(fd, (struct sockaddr *)&un_my_addr, &un_my_addrlen);
816 ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
817 child_si->family, &my_addr, &my_addrlen);
824 child_si->myname_len = my_addrlen;
825 child_si->myname = sockaddr_dup(&my_addr, my_addrlen);
827 child_si->peername_len = *addrlen;
828 child_si->peername = sockaddr_dup(addr, *addrlen);
830 DLIST_ADD(sockets, child_si);
832 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
833 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
834 swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
839 static int autobind_start_init;
840 static int autobind_start;
842 /* using sendto() or connect() on an unbound socket would give the
843 recipient no way to reply, as unlike UDP and TCP, a unix domain
844 socket can't auto-assign emphemeral port numbers, so we need to
846 static int swrap_auto_bind(struct socket_info *si)
848 struct sockaddr_un un_addr;
849 struct sockaddr_in in;
856 if (autobind_start_init != 1) {
857 autobind_start_init = 1;
858 autobind_start = getpid();
859 autobind_start %= 50000;
860 autobind_start += 10000;
863 un_addr.sun_family = AF_UNIX;
867 type = SOCKET_TYPE_CHAR_TCP;
870 type = SOCKET_TYPE_CHAR_UDP;
873 errno = ESOCKTNOSUPPORT;
877 if (autobind_start > 60000) {
878 autobind_start = 10000;
881 for (i=0;i<1000;i++) {
882 port = autobind_start + i;
883 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
884 "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
885 type, socket_wrapper_default_iface(), port);
886 if (stat(un_addr.sun_path, &st) == 0) continue;
888 ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
889 if (ret == -1) return ret;
891 si->tmp_path = strdup(un_addr.sun_path);
893 autobind_start = port + 1;
901 memset(&in, 0, sizeof(in));
902 in.sin_family = AF_INET;
903 in.sin_port = htons(port);
904 in.sin_addr.s_addr = htonl(127<<24 | socket_wrapper_default_iface());
906 si->myname_len = sizeof(in);
907 si->myname = sockaddr_dup(&in, si->myname_len);
912 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
915 struct sockaddr_un un_addr;
916 struct socket_info *si = find_socket_info(s);
919 return real_connect(s, serv_addr, addrlen);
922 if (si->bound == 0) {
923 ret = swrap_auto_bind(si);
924 if (ret == -1) return -1;
927 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
928 if (ret == -1) return -1;
930 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
932 ret = real_connect(s, (struct sockaddr *)&un_addr,
933 sizeof(struct sockaddr_un));
935 /* to give better errors */
936 if (ret == -1 && errno == ENOENT) {
937 errno = EHOSTUNREACH;
941 si->peername_len = addrlen;
942 si->peername = sockaddr_dup(serv_addr, addrlen);
944 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
945 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
947 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
953 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
956 struct sockaddr_un un_addr;
957 struct socket_info *si = find_socket_info(s);
960 return real_bind(s, myaddr, addrlen);
963 si->myname_len = addrlen;
964 si->myname = sockaddr_dup(myaddr, addrlen);
966 ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
967 if (ret == -1) return -1;
969 unlink(un_addr.sun_path);
971 ret = real_bind(s, (struct sockaddr *)&un_addr,
972 sizeof(struct sockaddr_un));
981 _PUBLIC_ int swrap_listen(int s, int backlog)
984 struct socket_info *si = find_socket_info(s);
987 return real_listen(s, backlog);
990 ret = real_listen(s, backlog);
995 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
997 struct socket_info *si = find_socket_info(s);
1000 return real_getpeername(s, name, addrlen);
1009 memcpy(name, si->peername, si->peername_len);
1010 *addrlen = si->peername_len;
1015 _PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1017 struct socket_info *si = find_socket_info(s);
1020 return real_getsockname(s, name, addrlen);
1023 memcpy(name, si->myname, si->myname_len);
1024 *addrlen = si->myname_len;
1029 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1031 struct socket_info *si = find_socket_info(s);
1034 return real_getsockopt(s, level, optname, optval, optlen);
1037 if (level == SOL_SOCKET) {
1038 return real_getsockopt(s, level, optname, optval, optlen);
1041 errno = ENOPROTOOPT;
1045 _PUBLIC_ int swrap_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
1047 struct socket_info *si = find_socket_info(s);
1050 return real_setsockopt(s, level, optname, optval, optlen);
1053 if (level == SOL_SOCKET) {
1054 return real_setsockopt(s, level, optname, optval, optlen);
1057 switch (si->family) {
1061 errno = ENOPROTOOPT;
1066 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
1068 struct sockaddr_un un_addr;
1069 socklen_t un_addrlen = sizeof(un_addr);
1071 struct socket_info *si = find_socket_info(s);
1074 return real_recvfrom(s, buf, len, flags, from, fromlen);
1077 /* irix 6.4 forgets to null terminate the sun_path string :-( */
1078 memset(&un_addr, 0, sizeof(un_addr));
1079 ret = real_recvfrom(s, buf, len, flags, (struct sockaddr *)&un_addr, &un_addrlen);
1083 if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
1084 si->family, from, fromlen) == -1) {
1088 swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
1094 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
1096 struct sockaddr_un un_addr;
1098 struct socket_info *si = find_socket_info(s);
1102 return real_sendto(s, buf, len, flags, to, tolen);
1105 if (si->bound == 0) {
1106 ret = swrap_auto_bind(si);
1107 if (ret == -1) return -1;
1110 ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
1111 if (ret == -1) return -1;
1116 unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
1119 type = SOCKET_TYPE_CHAR_UDP;
1121 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
1122 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
1123 socket_wrapper_dir(), type, iface, prt);
1124 if (stat(un_addr.sun_path, &st) != 0) continue;
1126 /* ignore the any errors in broadcast sends */
1127 real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1130 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1135 ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1137 /* to give better errors */
1138 if (ret == -1 && errno == ENOENT) {
1139 errno = EHOSTUNREACH;
1143 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1144 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
1146 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, ret);
1152 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1155 struct socket_info *si = find_socket_info(s);
1159 return real_ioctl(s, r, p);
1162 ret = real_ioctl(s, r, p);
1166 value = *((int *)p);
1167 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1168 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1169 } else if (value == 0) { /* END OF FILE */
1170 swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1178 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
1181 struct socket_info *si = find_socket_info(s);
1184 return real_recv(s, buf, len, flags);
1187 ret = real_recv(s, buf, len, flags);
1188 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1189 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1190 } else if (ret == 0) { /* END OF FILE */
1191 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1193 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
1200 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
1203 struct socket_info *si = find_socket_info(s);
1206 return real_send(s, buf, len, flags);
1209 ret = real_send(s, buf, len, flags);
1212 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
1213 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
1215 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
1221 _PUBLIC_ int swrap_close(int fd)
1223 struct socket_info *si = find_socket_info(fd);
1227 return real_close(fd);
1230 DLIST_REMOVE(sockets, si);
1232 if (si->myname && si->peername) {
1233 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
1236 ret = real_close(fd);
1238 if (si->myname && si->peername) {
1239 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
1240 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
1243 if (si->path) free(si->path);
1244 if (si->myname) free(si->myname);
1245 if (si->peername) free(si->peername);
1247 unlink(si->tmp_path);