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GeezerVison is showing github.com — circuitpython/extmod/modlwip.c at master · ProGamerCode/circuitpython Expand file tree/ Copy pathmodlwip.cMore file actions 1458 lines (1246 loc) · 49.7 KB / Copy pathmodlwip.cFile metadata and controls1458 lines (1246 loc) · 49.7 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 /* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2013, 2014 Damien P. George * Copyright (c) 2015 Galen Hazelwood * Copyright (c) 2015-2017 Paul Sokolovsky * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include <string.h> #include <stdio.h> #include "py/objlist.h" #include "py/runtime.h" #include "py/stream.h" #include "py/mperrno.h" #include "py/mphal.h" #include "lib/netutils/netutils.h" #include "lwip/init.h" #include "lwip/tcp.h" #include "lwip/udp.h" //#include "lwip/raw.h" #include "lwip/dns.h" #include "lwip/igmp.h" #if LWIP_VERSION_MAJOR < 2 #include "lwip/timers.h" #include "lwip/tcp_impl.h" #else #include "lwip/timeouts.h" #include "lwip/priv/tcp_priv.h" #endif #if 0 // print debugging info #define DEBUG_printf DEBUG_printf #else // don't print debugging info #define DEBUG_printf(...) (void)0 #endif // All socket options should be globally distinct, // because we ignore option levels for efficiency. #define IP_ADD_MEMBERSHIP 0x400 // For compatibilily with older lwIP versions. #ifndef ip_set_option #define ip_set_option(pcb, opt) ((pcb)->so_options |= (opt)) #endif #ifndef ip_reset_option #define ip_reset_option(pcb, opt) ((pcb)->so_options &= ~(opt)) #endif #if MICROPY_PY_LWIP_SLIP #include "netif/slipif.h" #include "lwip/sio.h" #endif #if MICROPY_PY_LWIP_SLIP /******************************************************************************/ // Slip object for modlwip. Requires a serial driver for the port that supports // the lwip serial callback functions. typedef struct _lwip_slip_obj_t { mp_obj_base_t base; struct netif lwip_netif; } lwip_slip_obj_t; // Slip object is unique for now. Possibly can fix this later. FIXME STATIC lwip_slip_obj_t lwip_slip_obj; // Declare these early. void mod_lwip_register_poll(void (*poll)(void *arg), void *poll_arg); void mod_lwip_deregister_poll(void (*poll)(void *arg), void *poll_arg); STATIC void slip_lwip_poll(void *netif) { slipif_poll((struct netif*)netif); } STATIC const mp_obj_type_t lwip_slip_type; // lwIP SLIP callback functions sio_fd_t sio_open(u8_t dvnum) { // We support singleton SLIP interface, so just return any truish value. return (sio_fd_t)1; } void sio_send(u8_t c, sio_fd_t fd) { mp_obj_type_t *type = mp_obj_get_type(MP_STATE_VM(lwip_slip_stream)); int error; type->stream_p->write(MP_STATE_VM(lwip_slip_stream), &c, 1, &error); } u32_t sio_tryread(sio_fd_t fd, u8_t *data, u32_t len) { mp_obj_type_t *type = mp_obj_get_type(MP_STATE_VM(lwip_slip_stream)); int error; mp_uint_t out_sz = type->stream_p->read(MP_STATE_VM(lwip_slip_stream), data, len, &error); if (out_sz == MP_STREAM_ERROR) { if (mp_is_nonblocking_error(error)) { return 0; } // Can't do much else, can we? return 0; } return out_sz; } // constructor lwip.slip(device=integer, iplocal=string, ipremote=string) STATIC mp_obj_t lwip_slip_make_new(mp_obj_t type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) { mp_arg_check_num(n_args, n_kw, 3, 3, false); lwip_slip_obj.base.type = &lwip_slip_type; MP_STATE_VM(lwip_slip_stream) = args[0]; ip_addr_t iplocal, ipremote; if (!ipaddr_aton(mp_obj_str_get_str(args[1]), &iplocal)) { mp_raise_ValueError("not a valid local IP"); } if (!ipaddr_aton(mp_obj_str_get_str(args[2]), &ipremote)) { mp_raise_ValueError("not a valid remote IP"); } struct netif *n = &lwip_slip_obj.lwip_netif; if (netif_add(n, &iplocal, IP_ADDR_BROADCAST, &ipremote, NULL, slipif_init, ip_input) == NULL) { mp_raise_ValueError("out of memory"); } netif_set_up(n); netif_set_default(n); mod_lwip_register_poll(slip_lwip_poll, n); return (mp_obj_t)&lwip_slip_obj; } STATIC mp_obj_t lwip_slip_status(mp_obj_t self_in) { // Null function for now. return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_1(lwip_slip_status_obj, lwip_slip_status); STATIC const mp_rom_map_elem_t lwip_slip_locals_dict_table[] = { { MP_ROM_QSTR(MP_QSTR_status), MP_ROM_PTR(&lwip_slip_status_obj) }, }; STATIC MP_DEFINE_CONST_DICT(lwip_slip_locals_dict, lwip_slip_locals_dict_table); STATIC const mp_obj_type_t lwip_slip_type = { { &mp_type_type }, .name = MP_QSTR_slip, .make_new = lwip_slip_make_new, .locals_dict = (mp_obj_dict_t*)&lwip_slip_locals_dict, }; #endif // MICROPY_PY_LWIP_SLIP /******************************************************************************/ // Table to convert lwIP err_t codes to socket errno codes, from the lwIP // socket API. // lwIP 2 changed LWIP_VERSION and it can no longer be used in macros, // so we define our own equivalent version that can. #define LWIP_VERSION_MACRO (LWIP_VERSION_MAJOR << 24 | LWIP_VERSION_MINOR << 16 \ | LWIP_VERSION_REVISION << 8 | LWIP_VERSION_RC) // Extension to lwIP error codes #define _ERR_BADF -16 // TODO: We just know that change happened somewhere between 1.4.0 and 1.4.1, // investigate in more detail. #if LWIP_VERSION_MACRO < 0x01040100 static const int error_lookup_table[] = { 0, /* ERR_OK 0 No error, everything OK. */ MP_ENOMEM, /* ERR_MEM -1 Out of memory error. */ MP_ENOBUFS, /* ERR_BUF -2 Buffer error. */ MP_EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */ MP_EHOSTUNREACH, /* ERR_RTE -4 Routing problem. */ MP_EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */ MP_EINVAL, /* ERR_VAL -6 Illegal value. */ MP_EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block. */ MP_ECONNABORTED, /* ERR_ABRT -8 Connection aborted. */ MP_ECONNRESET, /* ERR_RST -9 Connection reset. */ MP_ENOTCONN, /* ERR_CLSD -10 Connection closed. */ MP_ENOTCONN, /* ERR_CONN -11 Not connected. */ MP_EIO, /* ERR_ARG -12 Illegal argument. */ MP_EADDRINUSE, /* ERR_USE -13 Address in use. */ -1, /* ERR_IF -14 Low-level netif error */ MP_EALREADY, /* ERR_ISCONN -15 Already connected. */ MP_EBADF, /* _ERR_BADF -16 Closed socket (null pcb) */ }; #elif LWIP_VERSION_MACRO < 0x02000000 static const int error_lookup_table[] = { 0, /* ERR_OK 0 No error, everything OK. */ MP_ENOMEM, /* ERR_MEM -1 Out of memory error. */ MP_ENOBUFS, /* ERR_BUF -2 Buffer error. */ MP_EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */ MP_EHOSTUNREACH, /* ERR_RTE -4 Routing problem. */ MP_EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */ MP_EINVAL, /* ERR_VAL -6 Illegal value. */ MP_EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block. */ MP_EADDRINUSE, /* ERR_USE -8 Address in use. */ MP_EALREADY, /* ERR_ISCONN -9 Already connected. */ MP_ECONNABORTED, /* ERR_ABRT -10 Connection aborted. */ MP_ECONNRESET, /* ERR_RST -11 Connection reset. */ MP_ENOTCONN, /* ERR_CLSD -12 Connection closed. */ MP_ENOTCONN, /* ERR_CONN -13 Not connected. */ MP_EIO, /* ERR_ARG -14 Illegal argument. */ -1, /* ERR_IF -15 Low-level netif error */ MP_EBADF, /* _ERR_BADF -16 Closed socket (null pcb) */ }; #else // Matches lwIP 2.0.3 #undef _ERR_BADF #define _ERR_BADF -17 static const int error_lookup_table[] = { 0, /* ERR_OK 0 No error, everything OK */ MP_ENOMEM, /* ERR_MEM -1 Out of memory error */ MP_ENOBUFS, /* ERR_BUF -2 Buffer error */ MP_EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */ MP_EHOSTUNREACH, /* ERR_RTE -4 Routing problem */ MP_EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */ MP_EINVAL, /* ERR_VAL -6 Illegal value */ MP_EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block */ MP_EADDRINUSE, /* ERR_USE -8 Address in use */ MP_EALREADY, /* ERR_ALREADY -9 Already connecting */ MP_EALREADY, /* ERR_ISCONN -10 Conn already established */ MP_ENOTCONN, /* ERR_CONN -11 Not connected */ -1, /* ERR_IF -12 Low-level netif error */ MP_ECONNABORTED, /* ERR_ABRT -13 Connection aborted */ MP_ECONNRESET, /* ERR_RST -14 Connection reset */ MP_ENOTCONN, /* ERR_CLSD -15 Connection closed */ MP_EIO, /* ERR_ARG -16 Illegal argument. */ MP_EBADF, /* _ERR_BADF -17 Closed socket (null pcb) */ }; #endif /*******************************************************************************/ // The socket object provided by lwip.socket. #define MOD_NETWORK_AF_INET (2) #define MOD_NETWORK_AF_INET6 (10) #define MOD_NETWORK_SOCK_STREAM (1) #define MOD_NETWORK_SOCK_DGRAM (2) #define MOD_NETWORK_SOCK_RAW (3) typedef struct _lwip_socket_obj_t { mp_obj_base_t base; volatile union { struct tcp_pcb *tcp; struct udp_pcb *udp; } pcb; volatile union { struct pbuf *pbuf; struct tcp_pcb *connection; } incoming; mp_obj_t callback; byte peer[4]; mp_uint_t peer_port; mp_uint_t timeout; uint16_t recv_offset; uint8_t domain; uint8_t type; #define STATE_NEW 0 #define STATE_CONNECTING 1 #define STATE_CONNECTED 2 #define STATE_PEER_CLOSED 3 // Negative value is lwIP error int8_t state; } lwip_socket_obj_t; static inline void poll_sockets(void) { #ifdef MICROPY_EVENT_POLL_HOOK MICROPY_EVENT_POLL_HOOK; #else mp_hal_delay_ms(1); #endif } /*******************************************************************************/ // Callback functions for the lwIP raw API. static inline void exec_user_callback(lwip_socket_obj_t *socket) { if (socket->callback != MP_OBJ_NULL) { mp_call_function_1_protected(socket->callback, socket); } } // Callback for incoming UDP packets. We simply stash the packet and the source address, // in case we need it for recvfrom. #if LWIP_VERSION_MAJOR < 2 STATIC void _lwip_udp_incoming(void *arg, struct udp_pcb *upcb, struct pbuf *p, ip_addr_t *addr, u16_t port) #else STATIC void _lwip_udp_incoming(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port) #endif { lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg; if (socket->incoming.pbuf != NULL) { // That's why they call it "unreliable". No room in the inn, drop the packet. pbuf_free(p); } else { socket->incoming.pbuf = p; socket->peer_port = (mp_uint_t)port; memcpy(&socket->peer, addr, sizeof(socket->peer)); } } // Callback for general tcp errors. STATIC void _lwip_tcp_error(void *arg, err_t err) { lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg; // Pass the error code back via the connection variable. socket->state = err; // If we got here, the lwIP stack either has deallocated or will deallocate the pcb. socket->pcb.tcp = NULL; } // Callback for tcp connection requests. Error code err is unused. (See tcp.h) STATIC err_t _lwip_tcp_connected(void *arg, struct tcp_pcb *tpcb, err_t err) { lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg; socket->state = STATE_CONNECTED; return ERR_OK; } // By default, a child socket of listen socket is created with recv // handler which discards incoming pbuf's. We don't want to do that, // so set this handler which requests lwIP to keep pbuf's and deliver // them later. We cannot cache pbufs in child socket on Python side, // until it is created in accept(). STATIC err_t _lwip_tcp_recv_unaccepted(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) { return ERR_BUF; } // "Poll" (idle) callback to be called ASAP after accept callback // to execute Python callback function, as it can't be executed // from accept callback itself. STATIC err_t _lwip_tcp_accept_finished(void *arg, struct tcp_pcb *pcb) { lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg; tcp_poll(pcb, NULL, 0); exec_user_callback(socket); return ERR_OK; } // Callback for incoming tcp connections. STATIC err_t _lwip_tcp_accept(void *arg, struct tcp_pcb *newpcb, err_t err) { lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg; tcp_recv(newpcb, _lwip_tcp_recv_unaccepted); if (socket->incoming.connection != NULL) { DEBUG_printf("_lwip_tcp_accept: Tried to queue >1 pcb waiting for accept\n"); // We need to handle this better. This single-level structure makes the // backlog setting kind of pointless. FIXME return ERR_BUF; } else { socket->incoming.connection = newpcb; if (socket->callback != MP_OBJ_NULL) { // Schedule accept callback to be called when lwIP is done // with processing this incoming connection on its side and // is idle. tcp_poll(newpcb, _lwip_tcp_accept_finished, 1); } return ERR_OK; } } // Callback for inbound tcp packets. STATIC err_t _lwip_tcp_recv(void *arg, struct tcp_pcb *tcpb, struct pbuf *p, err_t err) { lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg; if (p == NULL) { // Other side has closed connection. DEBUG_printf("_lwip_tcp_recv[%p]: other side closed connection\n", socket); socket->state = STATE_PEER_CLOSED; exec_user_callback(socket); return ERR_OK; } if (socket->incoming.pbuf == NULL) { socket->incoming.pbuf = p; } else { #ifdef SOCKET_SINGLE_PBUF return ERR_BUF; #else pbuf_cat(socket->incoming.pbuf, p); #endif } exec_user_callback(socket); return ERR_OK; } /*******************************************************************************/ // Functions for socket send/receive operations. Socket send/recv and friends call // these to do the work. // Helper function for send/sendto to handle UDP packets. STATIC mp_uint_t lwip_udp_send(lwip_socket_obj_t *socket, const byte *buf, mp_uint_t len, byte *ip, mp_uint_t port, int *_errno) { if (len > 0xffff) { // Any packet that big is probably going to fail the pbuf_alloc anyway, but may as well try len = 0xffff; } // FIXME: maybe PBUF_ROM? struct pbuf *p = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM); if (p == NULL) { *_errno = MP_ENOMEM; return -1; } memcpy(p->payload, buf, len); err_t err; if (ip == NULL) { err = udp_send(socket->pcb.udp, p); } else { ip_addr_t dest; IP4_ADDR(&dest, ip[0], ip[1], ip[2], ip[3]); err = udp_sendto(socket->pcb.udp, p, &dest, port); } pbuf_free(p); // udp_sendto can return 1 on occasion for ESP8266 port. It's not known why // but it seems that the send actually goes through without error in this case. // So we treat such cases as a success until further investigation. if (err != ERR_OK && err != 1) { *_errno = error_lookup_table[-err]; return -1; } return len; } // Helper function for recv/recvfrom to handle UDP packets STATIC mp_uint_t lwip_udp_receive(lwip_socket_obj_t *socket, byte *buf, mp_uint_t len, byte *ip, mp_uint_t *port, int *_errno) { if (socket->incoming.pbuf == NULL) { if (socket->timeout != -1) { for (mp_uint_t retries = socket->timeout / 100; retries--;) { mp_hal_delay_ms(100); if (socket->incoming.pbuf != NULL) break; } if (socket->incoming.pbuf == NULL) { *_errno = MP_ETIMEDOUT; return -1; } } else { while (socket->incoming.pbuf == NULL) { poll_sockets(); } } } if (ip != NULL) { memcpy(ip, &socket->peer, sizeof(socket->peer)); *port = socket->peer_port; } struct pbuf *p = socket->incoming.pbuf; u16_t result = pbuf_copy_partial(p, buf, ((p->tot_len > len) ? len : p->tot_len), 0); pbuf_free(p); socket->incoming.pbuf = NULL; return (mp_uint_t) result; } // For use in stream virtual methods #define STREAM_ERROR_CHECK(socket) \ if (socket->state < 0) { \ *_errno = error_lookup_table[-socket->state]; \ return MP_STREAM_ERROR; \ } \ assert(socket->pcb.tcp); // Helper function for send/sendto to handle TCP packets STATIC mp_uint_t lwip_tcp_send(lwip_socket_obj_t *socket, const byte *buf, mp_uint_t len, int *_errno) { // Check for any pending errors STREAM_ERROR_CHECK(socket); u16_t available = tcp_sndbuf(socket->pcb.tcp); if (available == 0) { // Non-blocking socket if (socket->timeout == 0) { *_errno = MP_EAGAIN; return MP_STREAM_ERROR; } mp_uint_t start = mp_hal_ticks_ms(); // Assume that STATE_PEER_CLOSED may mean half-closed connection, where peer closed it // sending direction, but not receiving. Consequently, check for both STATE_CONNECTED // and STATE_PEER_CLOSED as normal conditions and still waiting for buffers to be sent. // If peer fully closed socket, we would have socket->state set to ERR_RST (connection // reset) by error callback. // Avoid sending too small packets, so wait until at least 16 bytes available while (socket->state >= STATE_CONNECTED && (available = tcp_sndbuf(socket->pcb.tcp)) < 16) { if (socket->timeout != -1 && mp_hal_ticks_ms() - start > socket->timeout) { *_errno = MP_ETIMEDOUT; return MP_STREAM_ERROR; } poll_sockets(); } // While we waited, something could happen STREAM_ERROR_CHECK(socket); } u16_t write_len = MIN(available, len); err_t err = tcp_write(socket->pcb.tcp, buf, write_len, TCP_WRITE_FLAG_COPY); // If the output buffer is getting full then send the data to the lower layers if (err == ERR_OK && tcp_sndbuf(socket->pcb.tcp) < TCP_SND_BUF / 4) { err = tcp_output(socket->pcb.tcp); } if (err != ERR_OK) { *_errno = error_lookup_table[-err]; return MP_STREAM_ERROR; } return write_len; } // Helper function for recv/recvfrom to handle TCP packets STATIC mp_uint_t lwip_tcp_receive(lwip_socket_obj_t *socket, byte *buf, mp_uint_t len, int *_errno) { // Check for any pending errors STREAM_ERROR_CHECK(socket); if (socket->incoming.pbuf == NULL) { // Non-blocking socket if (socket->timeout == 0) { if (socket->state == STATE_PEER_CLOSED) { return 0; } *_errno = MP_EAGAIN; return -1; } mp_uint_t start = mp_hal_ticks_ms(); while (socket->state == STATE_CONNECTED && socket->incoming.pbuf == NULL) { if (socket->timeout != -1 && mp_hal_ticks_ms() - start > socket->timeout) { *_errno = MP_ETIMEDOUT; return -1; } poll_sockets(); } if (socket->state == STATE_PEER_CLOSED) { if (socket->incoming.pbuf == NULL) { // socket closed and no data left in buffer return 0; } } else if (socket->state != STATE_CONNECTED) { assert(socket->state < 0); *_errno = error_lookup_table[-socket->state]; return -1; } } assert(socket->pcb.tcp != NULL); struct pbuf *p = socket->incoming.pbuf; mp_uint_t remaining = p->len - socket->recv_offset; if (len > remaining) { len = remaining; } memcpy(buf, (byte*)p->payload + socket->recv_offset, len); remaining -= len; if (remaining == 0) { socket->incoming.pbuf = p->next; // If we don't ref here, free() will free the entire chain, // if we ref, it does what we need: frees 1st buf, and decrements // next buf's refcount back to 1. pbuf_ref(p->next); pbuf_free(p); socket->recv_offset = 0; } else { socket->recv_offset += len; } tcp_recved(socket->pcb.tcp, len); return len; } /*******************************************************************************/ // The socket functions provided by lwip.socket. STATIC const mp_obj_type_t lwip_socket_type; STATIC void lwip_socket_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) { lwip_socket_obj_t *self = self_in; mp_printf(print, "<socket state=%d timeout=%d incoming=%p off=%d>", self->state, self->timeout, self->incoming.pbuf, self->recv_offset); } // FIXME: Only supports two arguments at present STATIC mp_obj_t lwip_socket_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) { mp_arg_check_num(n_args, n_kw, 0, 4, false); lwip_socket_obj_t *socket = m_new_obj_with_finaliser(lwip_socket_obj_t); socket->base.type = (mp_obj_t)&lwip_socket_type; socket->domain = MOD_NETWORK_AF_INET; socket->type = MOD_NETWORK_SOCK_STREAM; socket->callback = MP_OBJ_NULL; if (n_args >= 1) { socket->domain = mp_obj_get_int(args[0]); if (n_args >= 2) { socket->type = mp_obj_get_int(args[1]); } } switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: socket->pcb.tcp = tcp_new(); break; case MOD_NETWORK_SOCK_DGRAM: socket->pcb.udp = udp_new(); break; //case MOD_NETWORK_SOCK_RAW: socket->pcb.raw = raw_new(); break; default: mp_raise_OSError(MP_EINVAL); } if (socket->pcb.tcp == NULL) { mp_raise_OSError(MP_ENOMEM); } switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: { // Register the socket object as our callback argument. tcp_arg(socket->pcb.tcp, (void*)socket); // Register our error callback. tcp_err(socket->pcb.tcp, _lwip_tcp_error); break; } case MOD_NETWORK_SOCK_DGRAM: { // Register our receive callback now. Since UDP sockets don't require binding or connection // before use, there's no other good time to do it. udp_recv(socket->pcb.udp, _lwip_udp_incoming, (void*)socket); break; } } socket->incoming.pbuf = NULL; socket->timeout = -1; socket->state = STATE_NEW; socket->recv_offset = 0; return socket; } STATIC mp_obj_t lwip_socket_bind(mp_obj_t self_in, mp_obj_t addr_in) { lwip_socket_obj_t *socket = self_in; uint8_t ip[NETUTILS_IPV4ADDR_BUFSIZE]; mp_uint_t port = netutils_parse_inet_addr(addr_in, ip, NETUTILS_BIG); ip_addr_t bind_addr; IP4_ADDR(&bind_addr, ip[0], ip[1], ip[2], ip[3]); err_t err = ERR_ARG; switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: { err = tcp_bind(socket->pcb.tcp, &bind_addr, port); break; } case MOD_NETWORK_SOCK_DGRAM: { err = udp_bind(socket->pcb.udp, &bind_addr, port); break; } } if (err != ERR_OK) { mp_raise_OSError(error_lookup_table[-err]); } return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_2(lwip_socket_bind_obj, lwip_socket_bind); STATIC mp_obj_t lwip_socket_listen(mp_obj_t self_in, mp_obj_t backlog_in) { lwip_socket_obj_t *socket = self_in; mp_int_t backlog = mp_obj_get_int(backlog_in); if (socket->pcb.tcp == NULL) { mp_raise_OSError(MP_EBADF); } if (socket->type != MOD_NETWORK_SOCK_STREAM) { mp_raise_OSError(MP_EOPNOTSUPP); } struct tcp_pcb *new_pcb = tcp_listen_with_backlog(socket->pcb.tcp, (u8_t)backlog); if (new_pcb == NULL) { mp_raise_OSError(MP_ENOMEM); } socket->pcb.tcp = new_pcb; tcp_accept(new_pcb, _lwip_tcp_accept); // Socket is no longer considered "new" for purposes of polling socket->state = STATE_CONNECTING; return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_2(lwip_socket_listen_obj, lwip_socket_listen); STATIC mp_obj_t lwip_socket_accept(mp_obj_t self_in) { lwip_socket_obj_t *socket = self_in; if (socket->pcb.tcp == NULL) { mp_raise_OSError(MP_EBADF); } if (socket->type != MOD_NETWORK_SOCK_STREAM) { mp_raise_OSError(MP_EOPNOTSUPP); } // I need to do this because "tcp_accepted", later, is a macro. struct tcp_pcb *listener = socket->pcb.tcp; if (listener->state != LISTEN) { mp_raise_OSError(MP_EINVAL); } // accept incoming connection if (socket->incoming.connection == NULL) { if (socket->timeout == 0) { mp_raise_OSError(MP_EAGAIN); } else if (socket->timeout != -1) { for (mp_uint_t retries = socket->timeout / 100; retries--;) { mp_hal_delay_ms(100); if (socket->incoming.connection != NULL) break; } if (socket->incoming.connection == NULL) { mp_raise_OSError(MP_ETIMEDOUT); } } else { while (socket->incoming.connection == NULL) { poll_sockets(); } } } // create new socket object lwip_socket_obj_t *socket2 = m_new_obj_with_finaliser(lwip_socket_obj_t); socket2->base.type = (mp_obj_t)&lwip_socket_type; // We get a new pcb handle... socket2->pcb.tcp = socket->incoming.connection; socket->incoming.connection = NULL; // ...and set up the new socket for it. socket2->domain = MOD_NETWORK_AF_INET; socket2->type = MOD_NETWORK_SOCK_STREAM; socket2->incoming.pbuf = NULL; socket2->timeout = socket->timeout; socket2->state = STATE_CONNECTED; socket2->recv_offset = 0; socket2->callback = MP_OBJ_NULL; tcp_arg(socket2->pcb.tcp, (void*)socket2); tcp_err(socket2->pcb.tcp, _lwip_tcp_error); tcp_recv(socket2->pcb.tcp, _lwip_tcp_recv); tcp_accepted(listener); // make the return value uint8_t ip[NETUTILS_IPV4ADDR_BUFSIZE]; memcpy(ip, &(socket2->pcb.tcp->remote_ip), sizeof(ip)); mp_uint_t port = (mp_uint_t)socket2->pcb.tcp->remote_port; mp_obj_tuple_t *client = mp_obj_new_tuple(2, NULL); client->items[0] = socket2; client->items[1] = netutils_format_inet_addr(ip, port, NETUTILS_BIG); return client; } STATIC MP_DEFINE_CONST_FUN_OBJ_1(lwip_socket_accept_obj, lwip_socket_accept); STATIC mp_obj_t lwip_socket_connect(mp_obj_t self_in, mp_obj_t addr_in) { lwip_socket_obj_t *socket = self_in; if (socket->pcb.tcp == NULL) { mp_raise_OSError(MP_EBADF); } // get address uint8_t ip[NETUTILS_IPV4ADDR_BUFSIZE]; mp_uint_t port = netutils_parse_inet_addr(addr_in, ip, NETUTILS_BIG); ip_addr_t dest; IP4_ADDR(&dest, ip[0], ip[1], ip[2], ip[3]); err_t err = ERR_ARG; switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: { if (socket->state != STATE_NEW) { if (socket->state == STATE_CONNECTED) { mp_raise_OSError(MP_EISCONN); } else { mp_raise_OSError(MP_EALREADY); } } // Register our receive callback. tcp_recv(socket->pcb.tcp, _lwip_tcp_recv); socket->state = STATE_CONNECTING; err = tcp_connect(socket->pcb.tcp, &dest, port, _lwip_tcp_connected); if (err != ERR_OK) { socket->state = STATE_NEW; mp_raise_OSError(error_lookup_table[-err]); } socket->peer_port = (mp_uint_t)port; memcpy(socket->peer, &dest, sizeof(socket->peer)); // And now we wait... if (socket->timeout != -1) { for (mp_uint_t retries = socket->timeout / 100; retries--;) { mp_hal_delay_ms(100); if (socket->state != STATE_CONNECTING) break; } if (socket->state == STATE_CONNECTING) { mp_raise_OSError(MP_EINPROGRESS); } } else { while (socket->state == STATE_CONNECTING) { poll_sockets(); } } if (socket->state == STATE_CONNECTED) { err = ERR_OK; } else { err = socket->state; } break; } case MOD_NETWORK_SOCK_DGRAM: { err = udp_connect(socket->pcb.udp, &dest, port); break; } } if (err != ERR_OK) { mp_raise_OSError(error_lookup_table[-err]); } return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_2(lwip_socket_connect_obj, lwip_socket_connect); STATIC void lwip_socket_check_connected(lwip_socket_obj_t *socket) { if (socket->pcb.tcp == NULL) { // not connected int _errno = error_lookup_table[-socket->state]; socket->state = _ERR_BADF; mp_raise_OSError(_errno); } } STATIC mp_obj_t lwip_socket_send(mp_obj_t self_in, mp_obj_t buf_in) { lwip_socket_obj_t *socket = self_in; int _errno; lwip_socket_check_connected(socket); mp_buffer_info_t bufinfo; mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ); mp_uint_t ret = 0; switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: { ret = lwip_tcp_send(socket, bufinfo.buf, bufinfo.len, &_errno); break; } case MOD_NETWORK_SOCK_DGRAM: { ret = lwip_udp_send(socket, bufinfo.buf, bufinfo.len, NULL, 0, &_errno); break; } } if (ret == -1) { mp_raise_OSError(_errno); } return mp_obj_new_int_from_uint(ret); } STATIC MP_DEFINE_CONST_FUN_OBJ_2(lwip_socket_send_obj, lwip_socket_send); STATIC mp_obj_t lwip_socket_recv(mp_obj_t self_in, mp_obj_t len_in) { lwip_socket_obj_t *socket = self_in; int _errno; lwip_socket_check_connected(socket); mp_int_t len = mp_obj_get_int(len_in); vstr_t vstr; vstr_init_len(&vstr, len); mp_uint_t ret = 0; switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: { ret = lwip_tcp_receive(socket, (byte*)vstr.buf, len, &_errno); break; } case MOD_NETWORK_SOCK_DGRAM: { ret = lwip_udp_receive(socket, (byte*)vstr.buf, len, NULL, NULL, &_errno); break; } } if (ret == -1) { mp_raise_OSError(_errno); } if (ret == 0) { return mp_const_empty_bytes; } vstr.len = ret; return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr); } STATIC MP_DEFINE_CONST_FUN_OBJ_2(lwip_socket_recv_obj, lwip_socket_recv); STATIC mp_obj_t lwip_socket_sendto(mp_obj_t self_in, mp_obj_t data_in, mp_obj_t addr_in) { lwip_socket_obj_t *socket = self_in; int _errno; lwip_socket_check_connected(socket); mp_buffer_info_t bufinfo; mp_get_buffer_raise(data_in, &bufinfo, MP_BUFFER_READ); uint8_t ip[NETUTILS_IPV4ADDR_BUFSIZE]; mp_uint_t port = netutils_parse_inet_addr(addr_in, ip, NETUTILS_BIG); mp_uint_t ret = 0; switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: { ret = lwip_tcp_send(socket, bufinfo.buf, bufinfo.len, &_errno); break; } case MOD_NETWORK_SOCK_DGRAM: { ret = lwip_udp_send(socket, bufinfo.buf, bufinfo.len, ip, port, &_errno); break; } } if (ret == -1) { mp_raise_OSError(_errno); } return mp_obj_new_int_from_uint(ret); } STATIC MP_DEFINE_CONST_FUN_OBJ_3(lwip_socket_sendto_obj, lwip_socket_sendto); STATIC mp_obj_t lwip_socket_recvfrom(mp_obj_t self_in, mp_obj_t len_in) { lwip_socket_obj_t *socket = self_in; int _errno; lwip_socket_check_connected(socket); mp_int_t len = mp_obj_get_int(len_in); vstr_t vstr; vstr_init_len(&vstr, len); byte ip[4]; mp_uint_t port; mp_uint_t ret = 0; switch (socket->type) { case MOD_NETWORK_SOCK_STREAM: { memcpy(ip, &socket->peer, sizeof(socket->peer)); port = (mp_uint_t) socket->peer_port; ret = lwip_tcp_receive(socket, (byte*)vstr.buf, len, &_errno); break; } case MOD_NETWORK_SOCK_DGRAM: { ret = lwip_udp_receive(socket, (byte*)vstr.buf, len, ip, &port, &_errno); break; } } if (ret == -1) { mp_raise_OSError(_errno); } mp_obj_t tuple[2]; |
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