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GeezerVison is showing github.com — cpython/Modules/socketmodule.c at main · python/cpython Expand file tree/ Copy pathsocketmodule.cMore file actions 9433 lines (8322 loc) · 265 KB / Copy pathsocketmodule.cFile metadata and controls9433 lines (8322 loc) · 265 KB 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 /* Socket module */ /* This module provides an interface to Berkeley socket IPC. Limitations: - Only AF_INET, AF_INET6 and AF_UNIX address families are supported in a portable manner, though AF_PACKET, AF_NETLINK, AF_QIPCRTR and AF_TIPC are supported under Linux. - No read/write operations (use sendall/recv or makefile instead). - Additional restrictions apply on some non-Unix platforms (compensated for by socket.py). Module interface: - socket.error: exception raised for socket specific errors, alias for OSError - socket.gaierror: exception raised for getaddrinfo/getnameinfo errors, a subclass of socket.error - socket.herror: exception raised for gethostby* errors, a subclass of socket.error - socket.gethostbyname(hostname) --> host IP address (string: 'dd.dd.dd.dd') - socket.gethostbyaddr(IP address) --> (hostname, [alias, ...], [IP addr, ...]) - socket.gethostname() --> host name (string: 'spam' or 'spam.domain.com') - socket.getprotobyname(protocolname) --> protocol number - socket.getservbyname(servicename[, protocolname]) --> port number - socket.getservbyport(portnumber[, protocolname]) --> service name - socket.socket([family[, type [, proto, fileno]]]) --> new socket object (fileno specifies a pre-existing socket file descriptor) - socket.socketpair([family[, type [, proto]]]) --> (socket, socket) - socket.ntohs(16 bit value) --> new int object - socket.ntohl(32 bit value) --> new int object - socket.htons(16 bit value) --> new int object - socket.htonl(32 bit value) --> new int object - socket.getaddrinfo(host, port [, family, type, proto, flags]) --> List of (family, type, proto, canonname, sockaddr) - socket.getnameinfo(sockaddr, flags) --> (host, port) - socket.AF_INET, socket.SOCK_STREAM, etc.: constants from <socket.h> - socket.has_ipv6: boolean value indicating if IPv6 is supported - socket.inet_aton(IP address) -> 32-bit packed IP representation - socket.inet_ntoa(packed IP) -> IP address string - socket.getdefaulttimeout() -> None | float - socket.setdefaulttimeout(None | float) - socket.if_nameindex() -> list of tuples (if_index, if_name) - socket.if_nametoindex(name) -> corresponding interface index - socket.if_indextoname(index) -> corresponding interface name - an internet socket address is a pair (hostname, port) where hostname can be anything recognized by gethostbyname() (including the dd.dd.dd.dd notation) and port is in host byte order - where a hostname is returned, the dd.dd.dd.dd notation is used - a UNIX domain socket address is a string specifying the pathname - an AF_PACKET socket address is a tuple containing a string specifying the ethernet interface and an integer specifying the Ethernet protocol number to be received. For example: ("eth0",0x1234). Optional 3rd,4th,5th elements in the tuple specify packet-type and ha-type/addr. - an AF_QIPCRTR socket address is a (node, port) tuple where the node and port are non-negative integers. - an AF_TIPC socket address is expressed as (addr_type, v1, v2, v3 [, scope]); where addr_type can be one of: TIPC_ADDR_NAMESEQ, TIPC_ADDR_NAME, and TIPC_ADDR_ID; and scope can be one of: TIPC_ZONE_SCOPE, TIPC_CLUSTER_SCOPE, and TIPC_NODE_SCOPE. The meaning of v1, v2 and v3 depends on the value of addr_type: if addr_type is TIPC_ADDR_NAME: v1 is the server type v2 is the port identifier v3 is ignored if addr_type is TIPC_ADDR_NAMESEQ: v1 is the server type v2 is the lower port number v3 is the upper port number if addr_type is TIPC_ADDR_ID: v1 is the node v2 is the ref v3 is ignored Local naming conventions: - names starting with sock_ are socket object methods - names starting with socket_ are module-level functions - names starting with PySocket are exported through socketmodule.h */ #ifndef Py_BUILD_CORE_BUILTIN # define Py_BUILD_CORE_MODULE 1 #endif #ifdef __APPLE__ // Issue #35569: Expose RFC 3542 socket options. #define __APPLE_USE_RFC_3542 1 #include <AvailabilityMacros.h> /* for getaddrinfo thread safety test on old versions of OS X */ #ifndef MAC_OS_X_VERSION_10_5 #define MAC_OS_X_VERSION_10_5 1050 #endif /* * inet_aton is not available on OSX 10.3, yet we want to use a binary * that was build on 10.4 or later to work on that release, weak linking * comes to the rescue. */ # pragma weak inet_aton #endif #include "Python.h" #include "pycore_capsule.h" // _PyCapsule_SetTraverse() #include "pycore_fileutils.h" // _Py_set_inheritable() #include "pycore_moduleobject.h" // _PyModule_GetState #include "pycore_object.h" // _PyObject_VisitType() #include "pycore_time.h" // _PyTime_AsMilliseconds() #include "pycore_tuple.h" // _PyTuple_FromPairSteal #include "pycore_pystate.h" // _Py_AssertHoldsTstate() #ifdef _Py_MEMORY_SANITIZER # include <sanitizer/msan_interface.h> #endif /* Socket object documentation */ PyDoc_STRVAR(sock_doc, "socket(family=AF_INET, type=SOCK_STREAM, proto=0) -> socket object\n\ socket(family=-1, type=-1, proto=-1, fileno=None) -> socket object\n\ \n\ Open a socket of the given type. The family argument specifies the\n\ address family; it defaults to AF_INET. The type argument specifies\n\ whether this is a stream (SOCK_STREAM, this is the default)\n\ or datagram (SOCK_DGRAM) socket. The protocol argument defaults to 0,\n\ specifying the default protocol. Keyword arguments are accepted.\n\ The socket is created as non-inheritable.\n\ \n\ When a fileno is passed in, family, type and proto are auto-detected,\n\ unless they are explicitly set.\n\ \n\ A socket object represents one endpoint of a network connection.\n\ \n\ Methods of socket objects (keyword arguments not allowed):\n\ \n\ _accept() -- accept connection, returning new socket fd and client address\n\ bind(addr) -- bind the socket to a local address\n\ close() -- close the socket\n\ connect(addr) -- connect the socket to a remote address\n\ connect_ex(addr) -- connect, return an error code instead of an exception\n\ dup() -- return a new socket fd duplicated from fileno()\n\ fileno() -- return underlying file descriptor\n\ getpeername() -- return remote address [*]\n\ getsockname() -- return local address\n\ getsockopt(level, optname[, buflen]) -- get socket options\n\ gettimeout() -- return timeout or None\n\ listen([n]) -- start listening for incoming connections\n\ recv(buflen[, flags]) -- receive data\n\ recv_into(buffer[, nbytes[, flags]]) -- receive data (into a buffer)\n\ recvfrom(buflen[, flags]) -- receive data and sender\'s address\n\ recvfrom_into(buffer[, nbytes, [, flags]])\n\ -- receive data and sender\'s address (into a buffer)\n\ sendall(data[, flags]) -- send all data\n\ send(data[, flags]) -- send data, may not send all of it\n\ sendto(data[, flags], addr) -- send data to a given address\n\ setblocking(bool) -- set or clear the blocking I/O flag\n\ getblocking() -- return True if socket is blocking, False if non-blocking\n\ setsockopt(level, optname, value[, optlen]) -- set socket options\n\ settimeout(None | float) -- set or clear the timeout\n\ shutdown(how) -- shut down traffic in one or both directions\n\ \n\ [*] not available on all platforms!"); /* XXX This is a terrible mess of platform-dependent preprocessor hacks. I hope some day someone can clean this up please... */ /* Hacks for gethostbyname_r(). On some non-Linux platforms, the configure script doesn't get this right, so we hardcode some platform checks below. On the other hand, not all Linux versions agree, so there the settings computed by the configure script are needed! */ #ifndef __linux__ # undef HAVE_GETHOSTBYNAME_R_3_ARG # undef HAVE_GETHOSTBYNAME_R_5_ARG # undef HAVE_GETHOSTBYNAME_R_6_ARG #endif #if defined(__OpenBSD__) # include <sys/uio.h> #endif #if defined(__ANDROID__) && __ANDROID_API__ < 23 # undef HAVE_GETHOSTBYNAME_R #endif #ifdef HAVE_GETHOSTBYNAME_R # if defined(_AIX) && !defined(_LINUX_SOURCE_COMPAT) # define HAVE_GETHOSTBYNAME_R_3_ARG # elif defined(__sun) # define HAVE_GETHOSTBYNAME_R_5_ARG # elif defined(__linux__) /* Rely on the configure script */ # elif defined(_LINUX_SOURCE_COMPAT) /* Linux compatibility on AIX */ # define HAVE_GETHOSTBYNAME_R_6_ARG # else # undef HAVE_GETHOSTBYNAME_R # endif #endif #if !defined(HAVE_GETHOSTBYNAME_R) && !defined(MS_WINDOWS) # define USE_GETHOSTBYNAME_LOCK #endif #if defined(__APPLE__) || defined(__CYGWIN__) || defined(__NetBSD__) # include <sys/ioctl.h> #endif #if defined(HAVE_BLUETOOTH_H) && !defined(__FreeBSD__) # include <netbt/l2cap.h> # include <netbt/rfcomm.h> # include <netbt/hci.h> # include <netbt/sco.h> #endif /* Solaris fails to define this variable at all. */ #if (defined(__sun) && defined(__SVR4)) && !defined(INET_ADDRSTRLEN) #define INET_ADDRSTRLEN 16 #endif /* Generic includes */ #ifdef HAVE_SYS_TYPES_H #include <sys/types.h> #endif #ifdef HAVE_SYS_SOCKET_H #include <sys/socket.h> #endif #ifdef HAVE_NET_IF_H #include <net/if.h> #endif #ifdef HAVE_NET_ETHERNET_H #include <net/ethernet.h> #endif /* Generic socket object definitions and includes */ #define PySocket_BUILDING_SOCKET #include "socketmodule.h" /* Addressing includes */ #ifndef MS_WINDOWS /* Non-MS WINDOWS includes */ #ifdef HAVE_NETDB_H # include <netdb.h> #endif #include <unistd.h> // close() /* Headers needed for inet_ntoa() and inet_addr() */ # include <arpa/inet.h> # include <fcntl.h> #else /* MS_WINDOWS */ /* MS_WINDOWS includes */ # ifdef HAVE_FCNTL_H # include <fcntl.h> # endif /* Helpers needed for AF_HYPERV */ # include <Rpc.h> #ifndef RPC_S_OK #define RPC_S_OK 0L #endif /* Macros based on the IPPROTO enum, see: https://bugs.python.org/issue29515 */ #define IPPROTO_ICMP IPPROTO_ICMP #define IPPROTO_IGMP IPPROTO_IGMP #define IPPROTO_GGP IPPROTO_GGP #define IPPROTO_TCP IPPROTO_TCP #define IPPROTO_PUP IPPROTO_PUP #define IPPROTO_UDP IPPROTO_UDP #define IPPROTO_IDP IPPROTO_IDP #define IPPROTO_ND IPPROTO_ND #define IPPROTO_RAW IPPROTO_RAW #define IPPROTO_MAX IPPROTO_MAX #define IPPROTO_HOPOPTS IPPROTO_HOPOPTS #define IPPROTO_IPV4 IPPROTO_IPV4 #define IPPROTO_IPV6 IPPROTO_IPV6 #define IPPROTO_ROUTING IPPROTO_ROUTING #define IPPROTO_FRAGMENT IPPROTO_FRAGMENT #define IPPROTO_ESP IPPROTO_ESP #define IPPROTO_AH IPPROTO_AH #define IPPROTO_ICMPV6 IPPROTO_ICMPV6 #define IPPROTO_NONE IPPROTO_NONE #define IPPROTO_DSTOPTS IPPROTO_DSTOPTS #define IPPROTO_EGP IPPROTO_EGP #define IPPROTO_PIM IPPROTO_PIM #define IPPROTO_ICLFXBM IPPROTO_ICLFXBM // WinSock2 only #define IPPROTO_ST IPPROTO_ST // WinSock2 only #define IPPROTO_CBT IPPROTO_CBT // WinSock2 only #define IPPROTO_IGP IPPROTO_IGP // WinSock2 only #define IPPROTO_RDP IPPROTO_RDP // WinSock2 only #define IPPROTO_PGM IPPROTO_PGM // WinSock2 only #define IPPROTO_L2TP IPPROTO_L2TP // WinSock2 only #define IPPROTO_SCTP IPPROTO_SCTP // WinSock2 only /* Provides the IsWindows7SP1OrGreater() function */ #include <versionhelpers.h> // For if_nametoindex() and if_indextoname() #include <iphlpapi.h> /* remove some flags on older version Windows during run-time. https://msdn.microsoft.com/en-us/library/windows/desktop/ms738596.aspx */ typedef struct { DWORD build_number; /* available starting with this Win10 BuildNumber */ const char flag_name[20]; } FlagRuntimeInfo; /* IMPORTANT: make sure the list ordered by descending build_number */ static FlagRuntimeInfo win_runtime_flags[] = { /* available starting with Windows 10 1709 */ {16299, "TCP_KEEPIDLE"}, {16299, "TCP_KEEPINTVL"}, /* available starting with Windows 10 1703 */ {15063, "TCP_KEEPCNT"}, /* available starting with Windows 10 1607 */ {14393, "TCP_FASTOPEN"} }; static int remove_unusable_flags(PyObject *m) { PyObject *dict; OSVERSIONINFOEX info; dict = PyModule_GetDict(m); if (dict == NULL) { return -1; } #ifndef MS_WINDOWS_DESKTOP info.dwOSVersionInfoSize = sizeof(info); if (!GetVersionEx((OSVERSIONINFO*) &info)) { PyErr_SetFromWindowsErr(0); return -1; } #else /* set to Windows 10, except BuildNumber. */ memset(&info, 0, sizeof(info)); info.dwOSVersionInfoSize = sizeof(info); info.dwMajorVersion = 10; info.dwMinorVersion = 0; /* set Condition Mask */ DWORDLONG dwlConditionMask = 0; VER_SET_CONDITION(dwlConditionMask, VER_MAJORVERSION, VER_GREATER_EQUAL); VER_SET_CONDITION(dwlConditionMask, VER_MINORVERSION, VER_GREATER_EQUAL); VER_SET_CONDITION(dwlConditionMask, VER_BUILDNUMBER, VER_GREATER_EQUAL); #endif for (int i=0; i<sizeof(win_runtime_flags)/sizeof(FlagRuntimeInfo); i++) { #ifdef MS_WINDOWS_DESKTOP info.dwBuildNumber = win_runtime_flags[i].build_number; /* greater than or equal to the specified version? Compatibility Mode will not cheat VerifyVersionInfo(...) */ BOOL isSupported = VerifyVersionInfo( &info, VER_MAJORVERSION|VER_MINORVERSION|VER_BUILDNUMBER, dwlConditionMask); #else /* note in this case 'info' is the actual OS version, whereas above it is the version to compare against. */ BOOL isSupported = info.dwMajorVersion > 10 || (info.dwMajorVersion == 10 && info.dwMinorVersion > 0) || (info.dwMajorVersion == 10 && info.dwMinorVersion == 0 && info.dwBuildNumber >= win_runtime_flags[i].build_number); #endif if (isSupported) { break; } else { if (PyDict_PopString(dict, win_runtime_flags[i].flag_name, NULL) < 0) { return -1; } } } return 0; } #endif #include <stddef.h> #ifndef O_NONBLOCK # define O_NONBLOCK O_NDELAY #endif /* include Python's addrinfo.h unless it causes trouble */ /* Do not include addrinfo.h for MSVC. 'addrinfo' and * EAI_* constants are defined in (the already included) ws2tcpip.h. */ #if !defined(_MSC_VER) # include "addrinfo.h" #endif #ifdef __APPLE__ #ifdef HAVE_INET_ATON #define USE_INET_ATON_WEAKLINK #endif #endif /* I know this is a bad practice, but it is the easiest... */ #if !defined(HAVE_GETADDRINFO) /* avoid clashes with the C library definition of the symbol. */ #define getaddrinfo fake_getaddrinfo #define gai_strerror fake_gai_strerror #define freeaddrinfo fake_freeaddrinfo #include "getaddrinfo.c" #endif #if !defined(HAVE_GETNAMEINFO) #define getnameinfo fake_getnameinfo #include "getnameinfo.c" #endif // HAVE_GETNAMEINFO #ifdef MS_WINDOWS #define SOCKETCLOSE closesocket #endif #ifdef MS_WIN32 # undef EAFNOSUPPORT # define EAFNOSUPPORT WSAEAFNOSUPPORT #endif #ifndef SOCKETCLOSE # define SOCKETCLOSE close #endif #if defined(HAVE_BLUETOOTH_H) || defined(HAVE_BLUETOOTH_BLUETOOTH_H) # define USE_BLUETOOTH 1 # if defined(HAVE_BLUETOOTH_BLUETOOTH_H) // Linux # define _BT_L2_MEMB(sa, memb) ((sa)->l2_##memb) # define _BT_RC_MEMB(sa, memb) ((sa)->rc_##memb) # define _BT_HCI_MEMB(sa, memb) ((sa)->hci_##memb) # define _BT_SCO_MEMB(sa, memb) ((sa)->sco_##memb) # elif defined(__FreeBSD__) # define BTPROTO_L2CAP BLUETOOTH_PROTO_L2CAP # define BTPROTO_RFCOMM BLUETOOTH_PROTO_RFCOMM # define BTPROTO_HCI BLUETOOTH_PROTO_HCI # define BTPROTO_SCO BLUETOOTH_PROTO_SCO # define SOL_HCI SOL_HCI_RAW # define HCI_FILTER SO_HCI_RAW_FILTER # define HCI_DATA_DIR SO_HCI_RAW_DIRECTION # define sockaddr_l2 sockaddr_l2cap # define sockaddr_rc sockaddr_rfcomm # define hci_dev hci_node # define _BT_L2_MEMB(sa, memb) ((sa)->l2cap_##memb) # define _BT_RC_MEMB(sa, memb) ((sa)->rfcomm_##memb) # define _BT_HCI_MEMB(sa, memb) ((sa)->hci_##memb) # define _BT_SCO_MEMB(sa, memb) ((sa)->sco_##memb) # else // NetBSD, DragonFly BSD # define sockaddr_l2 sockaddr_bt # define sockaddr_rc sockaddr_bt # define sockaddr_hci sockaddr_bt # define sockaddr_sco sockaddr_bt # define bt_l2 bt # define bt_rc bt # define bt_sco bt # define bt_hci bt # define bt_cid bt_channel # define SOL_L2CAP BTPROTO_L2CAP # define SOL_RFCOMM BTPROTO_RFCOMM # define SOL_HCI BTPROTO_HCI # define SOL_SCO BTPROTO_SCO # define HCI_DATA_DIR SO_HCI_DIRECTION # define _BT_L2_MEMB(sa, memb) ((sa)->bt_##memb) # define _BT_RC_MEMB(sa, memb) ((sa)->bt_##memb) # define _BT_HCI_MEMB(sa, memb) ((sa)->bt_##memb) # define _BT_SCO_MEMB(sa, memb) ((sa)->bt_##memb) # endif #endif #ifdef MS_WINDOWS_DESKTOP #define sockaddr_rc SOCKADDR_BTH_REDEF #define USE_BLUETOOTH 1 #define AF_BLUETOOTH AF_BTH #define BTPROTO_RFCOMM BTHPROTO_RFCOMM #define _BT_RC_MEMB(sa, memb) ((sa)->memb) #endif /* MS_WINDOWS_DESKTOP */ /* Convert "sock_addr_t *" to "struct sockaddr *". */ #define SAS2SA(x) (&((x)->sa)) /* * Constants for getnameinfo() */ #if !defined(NI_MAXHOST) #define NI_MAXHOST 1025 #endif #if !defined(NI_MAXSERV) #define NI_MAXSERV 32 #endif #ifndef INVALID_SOCKET /* MS defines this */ #define INVALID_SOCKET (-1) #endif #ifndef INADDR_NONE #define INADDR_NONE (-1) #endif typedef struct _socket_state { /* The sock_type variable contains pointers to various functions, some of which call new_sockobject(), which uses sock_type, so there has to be a circular reference. */ PyTypeObject *sock_type; /* Global variable holding the exception type for errors detected by this module (but not argument type or memory errors, etc.). */ PyObject *socket_herror; PyObject *socket_gaierror; /* Default timeout for new sockets */ PyTime_t defaulttimeout; } socket_state; #if defined(HAVE_ACCEPT) || defined(HAVE_ACCEPT4) #if defined(HAVE_ACCEPT4) && defined(SOCK_CLOEXEC) /* accept4() is available on Linux 2.6.28+ and glibc 2.10 */ static int accept4_works = -1; #endif #endif #ifdef SOCK_CLOEXEC /* socket() and socketpair() fail with EINVAL on Linux kernel older * than 2.6.27 if SOCK_CLOEXEC flag is set in the socket type. */ static int sock_cloexec_works = -1; #endif static inline void set_sock_fd(PySocketSockObject *s, SOCKET_T fd) { #if SIZEOF_SOCKET_T == SIZEOF_INT _Py_atomic_store_int_relaxed((int *)&s->sock_fd, (int)fd); #elif SIZEOF_SOCKET_T == SIZEOF_LONG _Py_atomic_store_long_relaxed((long *)&s->sock_fd, (long)fd); #elif SIZEOF_SOCKET_T == SIZEOF_LONG_LONG _Py_atomic_store_llong_relaxed((long long *)&s->sock_fd, (long long)fd); #else #error "Unsupported SIZEOF_SOCKET_T" #endif } static inline SOCKET_T get_sock_fd(PySocketSockObject *s) { #if SIZEOF_SOCKET_T == SIZEOF_INT return (SOCKET_T)_Py_atomic_load_int_relaxed((int *)&s->sock_fd); #elif SIZEOF_SOCKET_T == SIZEOF_LONG return (SOCKET_T)_Py_atomic_load_long_relaxed((long *)&s->sock_fd); #elif SIZEOF_SOCKET_T == SIZEOF_LONG_LONG return (SOCKET_T)_Py_atomic_load_llong_relaxed((long long *)&s->sock_fd); #else #error "Unsupported SIZEOF_SOCKET_T" #endif } #define _PySocketSockObject_CAST(op) ((PySocketSockObject *)(op)) static inline socket_state * get_module_state(PyObject *mod) { void *state = _PyModule_GetState(mod); assert(state != NULL); return (socket_state *)state; } static struct PyModuleDef socketmodule; static inline socket_state * find_module_state_by_def(PyTypeObject *type) { PyObject *mod = PyType_GetModuleByDef(type, &socketmodule); assert(mod != NULL); return get_module_state(mod); } #define UNSIGNED_INT_CONVERTER(NAME, TYPE) \ static int \ _PyLong_##NAME##_Converter(PyObject *obj, void *ptr) \ { \ Py_ssize_t bytes = PyLong_AsNativeBytes(obj, ptr, sizeof(TYPE), \ Py_ASNATIVEBYTES_NATIVE_ENDIAN | \ Py_ASNATIVEBYTES_ALLOW_INDEX | \ Py_ASNATIVEBYTES_REJECT_NEGATIVE | \ Py_ASNATIVEBYTES_UNSIGNED_BUFFER); \ if (bytes < 0) { \ return 0; \ } \ if ((size_t)bytes > sizeof(TYPE)) { \ PyErr_SetString(PyExc_OverflowError, \ "Python int too large for C " #TYPE); \ return 0; \ } \ return 1; \ } #if defined(HAVE_IF_INDEXTONAME) || defined(MS_WINDOWS_DESKTOP) # ifdef MS_WINDOWS UNSIGNED_INT_CONVERTER(NetIfindex, NET_IFINDEX) # else # define _PyLong_NetIfindex_Converter _PyLong_UnsignedInt_Converter # define NET_IFINDEX unsigned int # endif #endif // defined(HAVE_IF_INDEXTONAME) || defined(MS_WINDOWS_DESKTOP) /*[python input] class NET_IFINDEX_converter(CConverter): type = "NET_IFINDEX" converter = '_PyLong_NetIfindex_Converter' [python start generated code]*/ /*[python end generated code: output=da39a3ee5e6b4b0d input=1cf809c40a407c34]*/ /*[clinic input] module _socket class _socket.socket "PySocketSockObject *" "clinic_state()->sock_type" [clinic start generated code]*/ /*[clinic end generated code: output=da39a3ee5e6b4b0d input=2db2489bd2219fd8]*/ /* XXX There's a problem here: *static* functions are not supposed to have a Py prefix (or use CapitalizedWords). Later... */ #if defined(HAVE_POLL_H) #include <poll.h> #elif defined(HAVE_SYS_POLL_H) #include <sys/poll.h> #endif /* Largest value to try to store in a socklen_t (used when handling ancillary data). POSIX requires socklen_t to hold at least (2**31)-1 and recommends against storing larger values, but socklen_t was originally int in the BSD interface, so to be on the safe side we use the smaller of (2**31)-1 and INT_MAX. */ #if INT_MAX > 0x7fffffff #define SOCKLEN_T_LIMIT 0x7fffffff #else #define SOCKLEN_T_LIMIT INT_MAX #endif #ifdef HAVE_POLL /* Instead of select(), we'll use poll() since poll() works on any fd. */ #define IS_SELECTABLE(s) 1 /* Can we call select() with this socket without a buffer overrun? */ #else /* If there's no timeout left, we don't have to call select, so it's a safe, * little white lie. */ #define IS_SELECTABLE(s) (_PyIsSelectable_fd((s)->sock_fd) || (s)->sock_timeout <= 0) #endif // SCM_RIGHTS, sendmsg(), recvmsg() and sethostname() don't work properly on // Cygwin: disable these features. #ifdef __CYGWIN__ # undef CMSG_LEN # undef SCM_RIGHTS # undef HAVE_SETHOSTNAME #endif /* The default family of socketpair() is AF_UNIX if defined on the platform; otherwise, the default is AF_INET. */ #if defined(AF_UNIX) # define SOCKETPAIR_DEFAULT_FAMILY AF_UNIX #else # define SOCKETPAIR_DEFAULT_FAMILY AF_INET #endif #define clinic_state() (find_module_state_by_def(type)) #include "clinic/socketmodule.c.h" #undef clinic_state static PyObject* select_error(void) { PyErr_SetString(PyExc_OSError, "unable to select on socket"); return NULL; } #ifdef MS_WINDOWS #ifndef WSAEAGAIN #define WSAEAGAIN WSAEWOULDBLOCK #endif #define CHECK_ERRNO(expected) \ (WSAGetLastError() == WSA ## expected) #else #define CHECK_ERRNO(expected) \ (errno == expected) #endif #ifdef MS_WINDOWS # define GET_SOCK_ERROR WSAGetLastError() # define SET_SOCK_ERROR(err) WSASetLastError(err) # define SOCK_TIMEOUT_ERR WSAEWOULDBLOCK # define SOCK_INPROGRESS_ERR WSAEWOULDBLOCK #else # define GET_SOCK_ERROR errno # define SET_SOCK_ERROR(err) do { errno = err; } while (0) # define SOCK_TIMEOUT_ERR EWOULDBLOCK # define SOCK_INPROGRESS_ERR EINPROGRESS #endif /* Convenience function to raise an error according to errno and return a NULL pointer from a function. */ static PyObject * set_error(void) { #ifdef MS_WINDOWS int err_no = WSAGetLastError(); /* PyErr_SetExcFromWindowsErr() invokes FormatMessage() which recognizes the error codes used by both GetLastError() and WSAGetLastError */ if (err_no) return PyErr_SetExcFromWindowsErr(PyExc_OSError, err_no); #endif return PyErr_SetFromErrno(PyExc_OSError); } #if defined(HAVE_HSTRERROR) || defined(HAVE_GAI_STRERROR) /* Decode a locale-encoded error message from the C library. It can be localized and use a non-UTF-8 encoding. */ static PyObject * decode_error_message(const char *str) { return PyUnicode_DecodeLocale(str, "surrogateescape"); } #endif #if defined(HAVE_GETHOSTBYNAME_R) || defined (HAVE_GETHOSTBYNAME) || defined (HAVE_GETHOSTBYADDR) static PyObject * set_herror(socket_state *state, int h_error) { PyObject *v; #ifdef HAVE_HSTRERROR const char *errmsg = hstrerror(h_error); _Py_MSAN_UNPOISON_STRING(errmsg); v = Py_BuildValue("(iN)", h_error, decode_error_message(errmsg)); #else v = Py_BuildValue("(is)", h_error, "host not found"); #endif if (v != NULL) { PyErr_SetObject(state->socket_herror, v); Py_DECREF(v); } return NULL; } #endif #ifdef HAVE_GETADDRINFO static PyObject * set_gaierror(socket_state *state, int error) { PyObject *v; #ifdef EAI_SYSTEM /* EAI_SYSTEM is not available on Windows XP. */ if (error == EAI_SYSTEM) return set_error(); #endif #ifdef HAVE_GAI_STRERROR const char *errmsg = gai_strerror(error); _Py_MSAN_UNPOISON_STRING(errmsg); v = Py_BuildValue("(iN)", error, decode_error_message(errmsg)); #else v = Py_BuildValue("(is)", error, "getaddrinfo failed"); #endif if (v != NULL) { PyErr_SetObject(state->socket_gaierror, v); Py_DECREF(v); } return NULL; } #endif /* Function to perform the setting of socket blocking mode internally. block = (1 | 0). */ static int internal_setblocking(PySocketSockObject *s, int block) { int result = -1; #ifdef MS_WINDOWS u_long arg; #endif #if !defined(MS_WINDOWS) \ && !((defined(HAVE_SYS_IOCTL_H) && defined(FIONBIO))) int delay_flag, new_delay_flag; #endif #ifndef MS_WINDOWS #if (defined(HAVE_SYS_IOCTL_H) && defined(FIONBIO)) block = !block; if (ioctl(get_sock_fd(s), FIONBIO, (unsigned int *)&block) == -1) goto done; #else delay_flag = fcntl(get_sock_fd(s), F_GETFL, 0); if (delay_flag == -1) goto done; if (block) new_delay_flag = delay_flag & (~O_NONBLOCK); else new_delay_flag = delay_flag | O_NONBLOCK; if (new_delay_flag != delay_flag) if (fcntl(get_sock_fd(s), F_SETFL, new_delay_flag) == -1) goto done; #endif #else /* MS_WINDOWS */ arg = !block; if (ioctlsocket(get_sock_fd(s), FIONBIO, &arg) != 0) goto done; #endif /* MS_WINDOWS */ result = 0; done: if (result) { #ifndef MS_WINDOWS PyErr_SetFromErrno(PyExc_OSError); #else PyErr_SetExcFromWindowsErr(PyExc_OSError, WSAGetLastError()); #endif } return result; } static int internal_select(PySocketSockObject *s, int writing, PyTime_t interval, int connect) { int n; #ifdef HAVE_POLL struct pollfd pollfd; PyTime_t ms; #else fd_set fds, efds; struct timeval tv, *tvp; #endif /* must be called with a thread state */ _Py_AssertHoldsTstate(); /* Error condition is for output only */ assert(!(connect && !writing)); /* Guard against closed socket */ if (get_sock_fd(s) == INVALID_SOCKET) return 0; /* Prefer poll, if available, since you can poll() any fd * which can't be done with select(). */ #ifdef HAVE_POLL pollfd.fd = get_sock_fd(s); pollfd.events = writing ? POLLOUT : POLLIN; if (connect) { /* On Windows, the socket becomes writable on connection success, but a connection failure is notified as an error. On POSIX, the socket becomes writable on connection success or on connection failure. */ pollfd.events |= POLLERR; } /* s->sock_timeout is in seconds, timeout in ms */ ms = _PyTime_AsMilliseconds(interval, _PyTime_ROUND_CEILING); if (ms > INT_MAX) { ms = INT_MAX; } /* On some OSes, typically BSD-based ones, the timeout parameter of the poll() syscall, when negative, must be exactly INFTIM, where defined, or -1. See issue 37811. */ if (ms < 0) { #ifdef INFTIM ms = INFTIM; #else ms = -1; #endif } assert(INT_MIN <= ms && ms <= INT_MAX); Py_BEGIN_ALLOW_THREADS; n = poll(&pollfd, 1, (int)ms); Py_END_ALLOW_THREADS; #else if (interval >= 0) { _PyTime_AsTimeval_clamp(interval, &tv, _PyTime_ROUND_CEILING); tvp = &tv; } else tvp = NULL; FD_ZERO(&fds); FD_SET(get_sock_fd(s), &fds); FD_ZERO(&efds); if (connect) { /* On Windows, the socket becomes writable on connection success, but a connection failure is notified as an error. On POSIX, the socket becomes writable on connection success or on connection failure. */ FD_SET(get_sock_fd(s), &efds); } /* See if the socket is ready */ Py_BEGIN_ALLOW_THREADS; if (writing) n = select(Py_SAFE_DOWNCAST(get_sock_fd(s)+1, SOCKET_T, int), NULL, &fds, &efds, tvp); else n = select(Py_SAFE_DOWNCAST(get_sock_fd(s)+1, SOCKET_T, int), &fds, NULL, &efds, tvp); Py_END_ALLOW_THREADS; #endif if (n < 0) return -1; if (n == 0) return 1; return 0; } /* Call a socket function. On error, raise an exception and return -1 if err is set, or fill err and return -1 otherwise. If a signal was received and the signal handler raised an exception, return -1, and set err to -1 if err is set. On success, return 0, and set err to 0 if err is set. If the socket has a timeout, wait until the socket is ready before calling the function: wait until the socket is writable if writing is nonzero, wait until the socket received data otherwise. If the socket function is interrupted by a signal (failed with EINTR): retry the function, except if the signal handler raised an exception (PEP 475). When the function is retried, recompute the timeout using a monotonic clock. sock_call_ex() must be called with the GIL held. The socket function is called with the GIL released. */ static int sock_call_ex(PySocketSockObject *s, int writing, int (*sock_func) (PySocketSockObject *s, void *data), void *data, int connect, int *err, PyTime_t timeout) { int has_timeout = (timeout > 0); PyTime_t deadline = 0; int deadline_initialized = 0; int res; /* sock_call() must be called with a thread state. */ _Py_AssertHoldsTstate(); /* outer loop to retry select() when select() is interrupted by a signal or to retry select()+sock_func() on false positive (see above) */ while (1) { /* For connect(), poll even for blocking socket. The connection runs asynchronously. */ if (has_timeout || connect) { if (has_timeout) { PyTime_t interval; if (deadline_initialized) { /* recompute the timeout */ interval = _PyDeadline_Get(deadline); } else { deadline_initialized = 1; deadline = _PyDeadline_Init(timeout); interval = timeout; } if (interval >= 0) { res = internal_select(s, writing, interval, connect); } else { res = 1; } } else { res = internal_select(s, writing, timeout, connect); |
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