-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcf-socket.c
1976 lines (1791 loc) · 56.8 KB
/
cf-socket.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <[email protected]>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h> /* <netinet/tcp.h> may need it */
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h> /* for sockaddr_un */
#endif
#ifdef HAVE_LINUX_TCP_H
#include <linux/tcp.h>
#elif defined(HAVE_NETINET_TCP_H)
#include <netinet/tcp.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#include "urldata.h"
#include "bufq.h"
#include "sendf.h"
#include "if2ip.h"
#include "strerror.h"
#include "cfilters.h"
#include "cf-socket.h"
#include "connect.h"
#include "select.h"
#include "url.h" /* for Curl_safefree() */
#include "multiif.h"
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "inet_ntop.h"
#include "inet_pton.h"
#include "progress.h"
#include "warnless.h"
#include "conncache.h"
#include "multihandle.h"
#include "rand.h"
#include "share.h"
#include "version_win32.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#if defined(ENABLE_IPV6) && defined(IPV6_V6ONLY) && defined(WIN32)
/* It makes support for IPv4-mapped IPv6 addresses.
* Linux kernel, NetBSD, FreeBSD and Darwin: default is off;
* Windows Vista and later: default is on;
* DragonFly BSD: acts like off, and dummy setting;
* OpenBSD and earlier Windows: unsupported.
* Linux: controlled by /proc/sys/net/ipv6/bindv6only.
*/
static void set_ipv6_v6only(curl_socket_t sockfd, int on)
{
(void)setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&on, sizeof(on));
}
#else
#define set_ipv6_v6only(x,y)
#endif
static void tcpnodelay(struct Curl_easy *data, curl_socket_t sockfd)
{
#if defined(TCP_NODELAY)
curl_socklen_t onoff = (curl_socklen_t) 1;
int level = IPPROTO_TCP;
#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
char buffer[STRERROR_LEN];
#else
(void) data;
#endif
if(setsockopt(sockfd, level, TCP_NODELAY, (void *)&onoff,
sizeof(onoff)) < 0)
infof(data, "Could not set TCP_NODELAY: %s",
Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
#else
(void)data;
(void)sockfd;
#endif
}
#ifdef SO_NOSIGPIPE
/* The preferred method on Mac OS X (10.2 and later) to prevent SIGPIPEs when
sending data to a dead peer (instead of relying on the 4th argument to send
being MSG_NOSIGNAL). Possibly also existing and in use on other BSD
systems? */
static void nosigpipe(struct Curl_easy *data,
curl_socket_t sockfd)
{
int onoff = 1;
if(setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&onoff,
sizeof(onoff)) < 0) {
#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
char buffer[STRERROR_LEN];
infof(data, "Could not set SO_NOSIGPIPE: %s",
Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
#endif
}
}
#else
#define nosigpipe(x,y) Curl_nop_stmt
#endif
#if defined(__DragonFly__) || defined(HAVE_WINSOCK2_H)
/* DragonFlyBSD and Windows use millisecond units */
#define KEEPALIVE_FACTOR(x) (x *= 1000)
#else
#define KEEPALIVE_FACTOR(x)
#endif
#if defined(HAVE_WINSOCK2_H) && !defined(SIO_KEEPALIVE_VALS)
#define SIO_KEEPALIVE_VALS _WSAIOW(IOC_VENDOR,4)
struct tcp_keepalive {
u_long onoff;
u_long keepalivetime;
u_long keepaliveinterval;
};
#endif
static void
tcpkeepalive(struct Curl_easy *data,
curl_socket_t sockfd)
{
int optval = data->set.tcp_keepalive?1:0;
/* only set IDLE and INTVL if setting KEEPALIVE is successful */
if(setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set SO_KEEPALIVE on fd %d", sockfd);
}
else {
#if defined(SIO_KEEPALIVE_VALS)
struct tcp_keepalive vals;
DWORD dummy;
vals.onoff = 1;
optval = curlx_sltosi(data->set.tcp_keepidle);
KEEPALIVE_FACTOR(optval);
vals.keepalivetime = optval;
optval = curlx_sltosi(data->set.tcp_keepintvl);
KEEPALIVE_FACTOR(optval);
vals.keepaliveinterval = optval;
if(WSAIoctl(sockfd, SIO_KEEPALIVE_VALS, (LPVOID) &vals, sizeof(vals),
NULL, 0, &dummy, NULL, NULL) != 0) {
infof(data, "Failed to set SIO_KEEPALIVE_VALS on fd %d: %d",
(int)sockfd, WSAGetLastError());
}
#else
#ifdef TCP_KEEPIDLE
optval = curlx_sltosi(data->set.tcp_keepidle);
KEEPALIVE_FACTOR(optval);
if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPIDLE,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set TCP_KEEPIDLE on fd %d", sockfd);
}
#elif defined(TCP_KEEPALIVE)
/* Mac OS X style */
optval = curlx_sltosi(data->set.tcp_keepidle);
KEEPALIVE_FACTOR(optval);
if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPALIVE,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set TCP_KEEPALIVE on fd %d", sockfd);
}
#endif
#ifdef TCP_KEEPINTVL
optval = curlx_sltosi(data->set.tcp_keepintvl);
KEEPALIVE_FACTOR(optval);
if(setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPINTVL,
(void *)&optval, sizeof(optval)) < 0) {
infof(data, "Failed to set TCP_KEEPINTVL on fd %d", sockfd);
}
#endif
#endif
}
}
/**
* Assign the address `ai` to the Curl_sockaddr_ex `dest` and
* set the transport used.
*/
void Curl_sock_assign_addr(struct Curl_sockaddr_ex *dest,
const struct Curl_addrinfo *ai,
int transport)
{
/*
* The Curl_sockaddr_ex structure is basically libcurl's external API
* curl_sockaddr structure with enough space available to directly hold
* any protocol-specific address structures. The variable declared here
* will be used to pass / receive data to/from the fopensocket callback
* if this has been set, before that, it is initialized from parameters.
*/
dest->family = ai->ai_family;
switch(transport) {
case TRNSPRT_TCP:
dest->socktype = SOCK_STREAM;
dest->protocol = IPPROTO_TCP;
break;
case TRNSPRT_UNIX:
dest->socktype = SOCK_STREAM;
dest->protocol = IPPROTO_IP;
break;
default: /* UDP and QUIC */
dest->socktype = SOCK_DGRAM;
dest->protocol = IPPROTO_UDP;
break;
}
dest->addrlen = ai->ai_addrlen;
if(dest->addrlen > sizeof(struct Curl_sockaddr_storage))
dest->addrlen = sizeof(struct Curl_sockaddr_storage);
memcpy(&dest->sa_addr, ai->ai_addr, dest->addrlen);
}
static CURLcode socket_open(struct Curl_easy *data,
struct Curl_sockaddr_ex *addr,
curl_socket_t *sockfd)
{
DEBUGASSERT(data);
DEBUGASSERT(data->conn);
if(data->set.fopensocket) {
/*
* If the opensocket callback is set, all the destination address
* information is passed to the callback. Depending on this information the
* callback may opt to abort the connection, this is indicated returning
* CURL_SOCKET_BAD; otherwise it will return a not-connected socket. When
* the callback returns a valid socket the destination address information
* might have been changed and this 'new' address will actually be used
* here to connect.
*/
Curl_set_in_callback(data, true);
*sockfd = data->set.fopensocket(data->set.opensocket_client,
CURLSOCKTYPE_IPCXN,
(struct curl_sockaddr *)addr);
Curl_set_in_callback(data, false);
}
else {
/* opensocket callback not set, so simply create the socket now */
*sockfd = socket(addr->family, addr->socktype, addr->protocol);
}
if(*sockfd == CURL_SOCKET_BAD)
/* no socket, no connection */
return CURLE_COULDNT_CONNECT;
#if defined(ENABLE_IPV6) && defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID)
if(data->conn->scope_id && (addr->family == AF_INET6)) {
struct sockaddr_in6 * const sa6 = (void *)&addr->sa_addr;
sa6->sin6_scope_id = data->conn->scope_id;
}
#endif
return CURLE_OK;
}
/*
* Create a socket based on info from 'conn' and 'ai'.
*
* 'addr' should be a pointer to the correct struct to get data back, or NULL.
* 'sockfd' must be a pointer to a socket descriptor.
*
* If the open socket callback is set, used that!
*
*/
CURLcode Curl_socket_open(struct Curl_easy *data,
const struct Curl_addrinfo *ai,
struct Curl_sockaddr_ex *addr,
int transport,
curl_socket_t *sockfd)
{
struct Curl_sockaddr_ex dummy;
if(!addr)
/* if the caller doesn't want info back, use a local temp copy */
addr = &dummy;
Curl_sock_assign_addr(addr, ai, transport);
return socket_open(data, addr, sockfd);
}
static int socket_close(struct Curl_easy *data, struct connectdata *conn,
int use_callback, curl_socket_t sock)
{
if(use_callback && conn && conn->fclosesocket) {
int rc;
Curl_multi_closed(data, sock);
Curl_set_in_callback(data, true);
rc = conn->fclosesocket(conn->closesocket_client, sock);
Curl_set_in_callback(data, false);
return rc;
}
if(conn)
/* tell the multi-socket code about this */
Curl_multi_closed(data, sock);
sclose(sock);
return 0;
}
/*
* Close a socket.
*
* 'conn' can be NULL, beware!
*/
int Curl_socket_close(struct Curl_easy *data, struct connectdata *conn,
curl_socket_t sock)
{
return socket_close(data, conn, FALSE, sock);
}
#ifdef USE_WINSOCK
/* When you run a program that uses the Windows Sockets API, you may
experience slow performance when you copy data to a TCP server.
https://support.microsoft.com/kb/823764
Work-around: Make the Socket Send Buffer Size Larger Than the Program Send
Buffer Size
The problem described in this knowledge-base is applied only to pre-Vista
Windows. Following function trying to detect OS version and skips
SO_SNDBUF adjustment for Windows Vista and above.
*/
#define DETECT_OS_NONE 0
#define DETECT_OS_PREVISTA 1
#define DETECT_OS_VISTA_OR_LATER 2
void Curl_sndbufset(curl_socket_t sockfd)
{
int val = CURL_MAX_WRITE_SIZE + 32;
int curval = 0;
int curlen = sizeof(curval);
static int detectOsState = DETECT_OS_NONE;
if(detectOsState == DETECT_OS_NONE) {
if(curlx_verify_windows_version(6, 0, 0, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL))
detectOsState = DETECT_OS_VISTA_OR_LATER;
else
detectOsState = DETECT_OS_PREVISTA;
}
if(detectOsState == DETECT_OS_VISTA_OR_LATER)
return;
if(getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, (char *)&curval, &curlen) == 0)
if(curval > val)
return;
setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, (const char *)&val, sizeof(val));
}
#endif
#ifndef CURL_DISABLE_BINDLOCAL
static CURLcode bindlocal(struct Curl_easy *data, struct connectdata *conn,
curl_socket_t sockfd, int af, unsigned int scope)
{
struct Curl_sockaddr_storage sa;
struct sockaddr *sock = (struct sockaddr *)&sa; /* bind to this address */
curl_socklen_t sizeof_sa = 0; /* size of the data sock points to */
struct sockaddr_in *si4 = (struct sockaddr_in *)&sa;
#ifdef ENABLE_IPV6
struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)&sa;
#endif
struct Curl_dns_entry *h = NULL;
unsigned short port = data->set.localport; /* use this port number, 0 for
"random" */
/* how many port numbers to try to bind to, increasing one at a time */
int portnum = data->set.localportrange;
const char *dev = data->set.str[STRING_DEVICE];
int error;
#ifdef IP_BIND_ADDRESS_NO_PORT
int on = 1;
#endif
#ifndef ENABLE_IPV6
(void)scope;
#endif
/*************************************************************
* Select device to bind socket to
*************************************************************/
if(!dev && !port)
/* no local kind of binding was requested */
return CURLE_OK;
memset(&sa, 0, sizeof(struct Curl_sockaddr_storage));
if(dev && (strlen(dev)<255) ) {
char myhost[256] = "";
int done = 0; /* -1 for error, 1 for address found */
bool is_interface = FALSE;
bool is_host = FALSE;
static const char *if_prefix = "if!";
static const char *host_prefix = "host!";
if(strncmp(if_prefix, dev, strlen(if_prefix)) == 0) {
dev += strlen(if_prefix);
is_interface = TRUE;
}
else if(strncmp(host_prefix, dev, strlen(host_prefix)) == 0) {
dev += strlen(host_prefix);
is_host = TRUE;
}
/* interface */
if(!is_host) {
#ifdef SO_BINDTODEVICE
/*
* This binds the local socket to a particular interface. This will
* force even requests to other local interfaces to go out the external
* interface. Only bind to the interface when specified as interface,
* not just as a hostname or ip address.
*
* The interface might be a VRF, eg: vrf-blue, which means it cannot be
* converted to an IP address and would fail Curl_if2ip. Simply try to
* use it straight away.
*/
if(setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE,
dev, (curl_socklen_t)strlen(dev) + 1) == 0) {
/* This is often "errno 1, error: Operation not permitted" if you're
* not running as root or another suitable privileged user. If it
* succeeds it means the parameter was a valid interface and not an IP
* address. Return immediately.
*/
infof(data, "socket successfully bound to interface '%s'", dev);
return CURLE_OK;
}
#endif
switch(Curl_if2ip(af,
#ifdef ENABLE_IPV6
scope, conn->scope_id,
#endif
dev, myhost, sizeof(myhost))) {
case IF2IP_NOT_FOUND:
if(is_interface) {
/* Do not fall back to treating it as a host name */
failf(data, "Couldn't bind to interface '%s'", dev);
return CURLE_INTERFACE_FAILED;
}
break;
case IF2IP_AF_NOT_SUPPORTED:
/* Signal the caller to try another address family if available */
return CURLE_UNSUPPORTED_PROTOCOL;
case IF2IP_FOUND:
is_interface = TRUE;
/*
* We now have the numerical IP address in the 'myhost' buffer
*/
infof(data, "Local Interface %s is ip %s using address family %i",
dev, myhost, af);
done = 1;
break;
}
}
if(!is_interface) {
/*
* This was not an interface, resolve the name as a host name
* or IP number
*
* Temporarily force name resolution to use only the address type
* of the connection. The resolve functions should really be changed
* to take a type parameter instead.
*/
unsigned char ipver = conn->ip_version;
int rc;
if(af == AF_INET)
conn->ip_version = CURL_IPRESOLVE_V4;
#ifdef ENABLE_IPV6
else if(af == AF_INET6)
conn->ip_version = CURL_IPRESOLVE_V6;
#endif
rc = Curl_resolv(data, dev, 80, FALSE, &h);
if(rc == CURLRESOLV_PENDING)
(void)Curl_resolver_wait_resolv(data, &h);
conn->ip_version = ipver;
if(h) {
/* convert the resolved address, sizeof myhost >= INET_ADDRSTRLEN */
Curl_printable_address(h->addr, myhost, sizeof(myhost));
infof(data, "Name '%s' family %i resolved to '%s' family %i",
dev, af, myhost, h->addr->ai_family);
Curl_resolv_unlock(data, h);
if(af != h->addr->ai_family) {
/* bad IP version combo, signal the caller to try another address
family if available */
return CURLE_UNSUPPORTED_PROTOCOL;
}
done = 1;
}
else {
/*
* provided dev was no interface (or interfaces are not supported
* e.g. solaris) no ip address and no domain we fail here
*/
done = -1;
}
}
if(done > 0) {
#ifdef ENABLE_IPV6
/* IPv6 address */
if(af == AF_INET6) {
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
char *scope_ptr = strchr(myhost, '%');
if(scope_ptr)
*(scope_ptr++) = '\0';
#endif
if(Curl_inet_pton(AF_INET6, myhost, &si6->sin6_addr) > 0) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
if(scope_ptr) {
/* The "myhost" string either comes from Curl_if2ip or from
Curl_printable_address. The latter returns only numeric scope
IDs and the former returns none at all. So the scope ID, if
present, is known to be numeric */
unsigned long scope_id = strtoul(scope_ptr, NULL, 10);
if(scope_id > UINT_MAX)
return CURLE_UNSUPPORTED_PROTOCOL;
si6->sin6_scope_id = (unsigned int)scope_id;
}
#endif
}
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
/* IPv4 address */
if((af == AF_INET) &&
(Curl_inet_pton(AF_INET, myhost, &si4->sin_addr) > 0)) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
if(done < 1) {
/* errorbuf is set false so failf will overwrite any message already in
the error buffer, so the user receives this error message instead of a
generic resolve error. */
data->state.errorbuf = FALSE;
failf(data, "Couldn't bind to '%s'", dev);
return CURLE_INTERFACE_FAILED;
}
}
else {
/* no device was given, prepare sa to match af's needs */
#ifdef ENABLE_IPV6
if(af == AF_INET6) {
si6->sin6_family = AF_INET6;
si6->sin6_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in6);
}
else
#endif
if(af == AF_INET) {
si4->sin_family = AF_INET;
si4->sin_port = htons(port);
sizeof_sa = sizeof(struct sockaddr_in);
}
}
#ifdef IP_BIND_ADDRESS_NO_PORT
(void)setsockopt(sockfd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &on, sizeof(on));
#endif
for(;;) {
if(bind(sockfd, sock, sizeof_sa) >= 0) {
/* we succeeded to bind */
struct Curl_sockaddr_storage add;
curl_socklen_t size = sizeof(add);
memset(&add, 0, sizeof(struct Curl_sockaddr_storage));
if(getsockname(sockfd, (struct sockaddr *) &add, &size) < 0) {
char buffer[STRERROR_LEN];
data->state.os_errno = error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(error, buffer, sizeof(buffer)));
return CURLE_INTERFACE_FAILED;
}
infof(data, "Local port: %hu", port);
conn->bits.bound = TRUE;
return CURLE_OK;
}
if(--portnum > 0) {
port++; /* try next port */
if(port == 0)
break;
infof(data, "Bind to local port %d failed, trying next", port - 1);
/* We reuse/clobber the port variable here below */
if(sock->sa_family == AF_INET)
si4->sin_port = ntohs(port);
#ifdef ENABLE_IPV6
else
si6->sin6_port = ntohs(port);
#endif
}
else
break;
}
{
char buffer[STRERROR_LEN];
data->state.os_errno = error = SOCKERRNO;
failf(data, "bind failed with errno %d: %s",
error, Curl_strerror(error, buffer, sizeof(buffer)));
}
return CURLE_INTERFACE_FAILED;
}
#endif
/*
* verifyconnect() returns TRUE if the connect really has happened.
*/
static bool verifyconnect(curl_socket_t sockfd, int *error)
{
bool rc = TRUE;
#ifdef SO_ERROR
int err = 0;
curl_socklen_t errSize = sizeof(err);
#ifdef WIN32
/*
* In October 2003 we effectively nullified this function on Windows due to
* problems with it using all CPU in multi-threaded cases.
*
* In May 2004, we bring it back to offer more info back on connect failures.
* Gisle Vanem could reproduce the former problems with this function, but
* could avoid them by adding this SleepEx() call below:
*
* "I don't have Rational Quantify, but the hint from his post was
* ntdll::NtRemoveIoCompletion(). So I'd assume the SleepEx (or maybe
* just Sleep(0) would be enough?) would release whatever
* mutex/critical-section the ntdll call is waiting on.
*
* Someone got to verify this on Win-NT 4.0, 2000."
*/
#ifdef _WIN32_WCE
Sleep(0);
#else
SleepEx(0, FALSE);
#endif
#endif
if(0 != getsockopt(sockfd, SOL_SOCKET, SO_ERROR, (void *)&err, &errSize))
err = SOCKERRNO;
#ifdef _WIN32_WCE
/* Old WinCE versions don't support SO_ERROR */
if(WSAENOPROTOOPT == err) {
SET_SOCKERRNO(0);
err = 0;
}
#endif
#if defined(EBADIOCTL) && defined(__minix)
/* Minix 3.1.x doesn't support getsockopt on UDP sockets */
if(EBADIOCTL == err) {
SET_SOCKERRNO(0);
err = 0;
}
#endif
if((0 == err) || (EISCONN == err))
/* we are connected, awesome! */
rc = TRUE;
else
/* This wasn't a successful connect */
rc = FALSE;
if(error)
*error = err;
#else
(void)sockfd;
if(error)
*error = SOCKERRNO;
#endif
return rc;
}
/**
* Determine the curl code for a socket connect() == -1 with errno.
*/
static CURLcode socket_connect_result(struct Curl_easy *data,
const char *ipaddress, int error)
{
switch(error) {
case EINPROGRESS:
case EWOULDBLOCK:
#if defined(EAGAIN)
#if (EAGAIN) != (EWOULDBLOCK)
/* On some platforms EAGAIN and EWOULDBLOCK are the
* same value, and on others they are different, hence
* the odd #if
*/
case EAGAIN:
#endif
#endif
return CURLE_OK;
default:
/* unknown error, fallthrough and try another address! */
#ifdef CURL_DISABLE_VERBOSE_STRINGS
(void)ipaddress;
#else
{
char buffer[STRERROR_LEN];
infof(data, "Immediate connect fail for %s: %s",
ipaddress, Curl_strerror(error, buffer, sizeof(buffer)));
}
#endif
data->state.os_errno = error;
/* connect failed */
return CURLE_COULDNT_CONNECT;
}
}
/* We have a recv buffer to enhance reads with len < NW_SMALL_READS.
* This happens often on TLS connections where the TLS implementation
* tries to read the head of a TLS record, determine the length of the
* full record and then make a subsequent read for that.
* On large reads, we will not fill the buffer to avoid the double copy. */
#define NW_RECV_CHUNK_SIZE (64 * 1024)
#define NW_RECV_CHUNKS 1
#define NW_SMALL_READS (1024)
struct cf_socket_ctx {
int transport;
struct Curl_sockaddr_ex addr; /* address to connect to */
curl_socket_t sock; /* current attempt socket */
struct bufq recvbuf; /* used when `buffer_recv` is set */
char r_ip[MAX_IPADR_LEN]; /* remote IP as string */
int r_port; /* remote port number */
char l_ip[MAX_IPADR_LEN]; /* local IP as string */
int l_port; /* local port number */
struct curltime started_at; /* when socket was created */
struct curltime connected_at; /* when socket connected/got first byte */
struct curltime first_byte_at; /* when first byte was recvd */
int error; /* errno of last failure or 0 */
#ifdef DEBUGBUILD
int wblock_percent; /* percent of writes doing EAGAIN */
int wpartial_percent; /* percent of bytes written in send */
#endif
BIT(got_first_byte); /* if first byte was received */
BIT(accepted); /* socket was accepted, not connected */
BIT(active);
BIT(buffer_recv);
};
static void cf_socket_ctx_init(struct cf_socket_ctx *ctx,
const struct Curl_addrinfo *ai,
int transport)
{
memset(ctx, 0, sizeof(*ctx));
ctx->sock = CURL_SOCKET_BAD;
ctx->transport = transport;
Curl_sock_assign_addr(&ctx->addr, ai, transport);
Curl_bufq_init(&ctx->recvbuf, NW_RECV_CHUNK_SIZE, NW_RECV_CHUNKS);
#ifdef DEBUGBUILD
{
char *p = getenv("CURL_DBG_SOCK_WBLOCK");
if(p) {
long l = strtol(p, NULL, 10);
if(l >= 0 && l <= 100)
ctx->wblock_percent = (int)l;
}
p = getenv("CURL_DBG_SOCK_WPARTIAL");
if(p) {
long l = strtol(p, NULL, 10);
if(l >= 0 && l <= 100)
ctx->wpartial_percent = (int)l;
}
}
#endif
}
struct reader_ctx {
struct Curl_cfilter *cf;
struct Curl_easy *data;
};
static ssize_t nw_in_read(void *reader_ctx,
unsigned char *buf, size_t len,
CURLcode *err)
{
struct reader_ctx *rctx = reader_ctx;
struct cf_socket_ctx *ctx = rctx->cf->ctx;
ssize_t nread;
*err = CURLE_OK;
nread = sread(ctx->sock, buf, len);
if(-1 == nread) {
int sockerr = SOCKERRNO;
if(
#ifdef WSAEWOULDBLOCK
/* This is how Windows does it */
(WSAEWOULDBLOCK == sockerr)
#else
/* errno may be EWOULDBLOCK or on some systems EAGAIN when it returned
due to its inability to send off data without blocking. We therefore
treat both error codes the same here */
(EWOULDBLOCK == sockerr) || (EAGAIN == sockerr) || (EINTR == sockerr)
#endif
) {
/* this is just a case of EWOULDBLOCK */
*err = CURLE_AGAIN;
nread = -1;
}
else {
char buffer[STRERROR_LEN];
failf(rctx->data, "Recv failure: %s",
Curl_strerror(sockerr, buffer, sizeof(buffer)));
rctx->data->state.os_errno = sockerr;
*err = CURLE_RECV_ERROR;
nread = -1;
}
}
CURL_TRC_CF(rctx->data, rctx->cf, "nw_in_read(len=%zu) -> %d, err=%d",
len, (int)nread, *err);
return nread;
}
static void cf_socket_close(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
if(ctx && CURL_SOCKET_BAD != ctx->sock) {
if(ctx->active) {
/* We share our socket at cf->conn->sock[cf->sockindex] when active.
* If it is no longer there, someone has stolen (and hopefully
* closed it) and we just forget about it.
*/
if(ctx->sock == cf->conn->sock[cf->sockindex]) {
CURL_TRC_CF(data, cf, "cf_socket_close(%" CURL_FORMAT_SOCKET_T
", active)", ctx->sock);
socket_close(data, cf->conn, !ctx->accepted, ctx->sock);
cf->conn->sock[cf->sockindex] = CURL_SOCKET_BAD;
}
else {
CURL_TRC_CF(data, cf, "cf_socket_close(%" CURL_FORMAT_SOCKET_T
") no longer at conn->sock[], discarding", ctx->sock);
/* TODO: we do not want this to happen. Need to check which
* code is messing with conn->sock[cf->sockindex] */
}
ctx->sock = CURL_SOCKET_BAD;
if(cf->sockindex == FIRSTSOCKET)
cf->conn->remote_addr = NULL;
}
else {
/* this is our local socket, we did never publish it */
CURL_TRC_CF(data, cf, "cf_socket_close(%" CURL_FORMAT_SOCKET_T
", not active)", ctx->sock);
socket_close(data, cf->conn, !ctx->accepted, ctx->sock);
ctx->sock = CURL_SOCKET_BAD;
}
Curl_bufq_reset(&ctx->recvbuf);
ctx->active = FALSE;
ctx->buffer_recv = FALSE;
memset(&ctx->started_at, 0, sizeof(ctx->started_at));
memset(&ctx->connected_at, 0, sizeof(ctx->connected_at));
}
cf->connected = FALSE;
}
static void cf_socket_destroy(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
cf_socket_close(cf, data);
CURL_TRC_CF(data, cf, "destroy");
Curl_bufq_free(&ctx->recvbuf);
free(ctx);
cf->ctx = NULL;
}
static CURLcode set_local_ip(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
#ifdef HAVE_GETSOCKNAME
if(!(data->conn->handler->protocol & CURLPROTO_TFTP)) {
/* TFTP does not connect, so it cannot get the IP like this */
char buffer[STRERROR_LEN];
struct Curl_sockaddr_storage ssloc;
curl_socklen_t slen = sizeof(struct Curl_sockaddr_storage);
memset(&ssloc, 0, sizeof(ssloc));
if(getsockname(ctx->sock, (struct sockaddr*) &ssloc, &slen)) {
int error = SOCKERRNO;
failf(data, "getsockname() failed with errno %d: %s",
error, Curl_strerror(error, buffer, sizeof(buffer)));
return CURLE_FAILED_INIT;
}
if(!Curl_addr2string((struct sockaddr*)&ssloc, slen,
ctx->l_ip, &ctx->l_port)) {
failf(data, "ssloc inet_ntop() failed with errno %d: %s",
errno, Curl_strerror(errno, buffer, sizeof(buffer)));
return CURLE_FAILED_INIT;
}
}
#else
(void)data;
ctx->l_ip[0] = 0;
ctx->l_port = -1;
#endif
return CURLE_OK;
}
static CURLcode set_remote_ip(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
/* store remote address and port used in this connection attempt */
if(!Curl_addr2string(&ctx->addr.sa_addr, ctx->addr.addrlen,
ctx->r_ip, &ctx->r_port)) {
char buffer[STRERROR_LEN];
ctx->error = errno;
/* malformed address or bug in inet_ntop, try next address */
failf(data, "sa_addr inet_ntop() failed with errno %d: %s",
errno, Curl_strerror(errno, buffer, sizeof(buffer)));
return CURLE_FAILED_INIT;
}
return CURLE_OK;
}
static CURLcode cf_socket_open(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
int error = 0;
bool isconnected = FALSE;
CURLcode result = CURLE_COULDNT_CONNECT;
bool is_tcp;
(void)data;
DEBUGASSERT(ctx->sock == CURL_SOCKET_BAD);
ctx->started_at = Curl_now();
result = socket_open(data, &ctx->addr, &ctx->sock);
if(result)
goto out;
result = set_remote_ip(cf, data);
if(result)
goto out;
#ifndef CURL_DISABLE_VERBOSE_STRINGS
{
const char *ipmsg;
#ifdef ENABLE_IPV6
if(ctx->addr.family == AF_INET6) {
set_ipv6_v6only(ctx->sock, 0);