lib/output.c

   1 /*
   2  * libwebsockets - small server side websockets and web server implementation
   3  *
   4  * Copyright (C) 2010-2015 Andy Green <andy@warmcat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation:
   9  *  version 2.1 of the License.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  *  MA  02110-1301  USA
  20  */
  21
  22 #include "private-libwebsockets.h"
  23
  24 static int
  25 lws_0405_frame_mask_generate(struct lws *wsi)
  26 {
  27 #if 0
  28         wsi->u.ws.mask[0] = 0;
  29         wsi->u.ws.mask[1] = 0;
  30         wsi->u.ws.mask[2] = 0;
  31         wsi->u.ws.mask[3] = 0;
  32 #else
  33         int n;
  34         /* fetch the per-frame nonce */
  35
  36         n = lws_get_random(lws_get_context(wsi), wsi->u.ws.mask, 4);
  37         if (n != 4) {
  38                 lwsl_parser("Unable to read from random device %s %d\n",
  39                             SYSTEM_RANDOM_FILEPATH, n);
  40                 return 1;
  41         }
  42 #endif
  43         /* start masking from first byte of masking key buffer */
  44         wsi->u.ws.mask_idx = 0;
  45
  46         return 0;
  47 }
  48
  49 #ifdef _DEBUG
  50
  51 LWS_VISIBLE void lwsl_hexdump(void *vbuf, size_t len)
  52 {
  53         unsigned char *buf = (unsigned char *)vbuf;
  54         unsigned int n, m, start;
  55         char line[80];
  56         char *p;
  57
  58         lwsl_parser("\n");
  59
  60         for (n = 0; n < len;) {
  61                 start = n;
  62                 p = line;
  63
  64                 p += sprintf(p, "%04X: ", start);
  65
  66                 for (m = 0; m < 16 && n < len; m++)
  67                         p += sprintf(p, "%02X ", buf[n++]);
  68                 while (m++ < 16)
  69                         p += sprintf(p, "   ");
  70
  71                 p += sprintf(p, "   ");
  72
  73                 for (m = 0; m < 16 && (start + m) < len; m++) {
  74                         if (buf[start + m] >= ' ' && buf[start + m] < 127)
  75                                 *p++ = buf[start + m];
  76                         else
  77                                 *p++ = '.';
  78                 }
  79                 while (m++ < 16)
  80                         *p++ = ' ';
  81
  82                 *p++ = '\n';
  83                 *p = '\0';
  84                 lwsl_debug("%s", line);
  85         }
  86         lwsl_debug("\n");
  87 }
  88
  89 #endif
  90
  91 /*
  92  * notice this returns number of bytes consumed, or -1
  93  */
  94
  95 int lws_issue_raw(struct lws *wsi, unsigned char *buf, size_t len)
  96 {
  97         struct lws_context *context = lws_get_context(wsi);
  98         size_t real_len = len;
  99         unsigned int n;
 100         int m;
 101
 102         if (!len)
 103                 return 0;
 104         /* just ignore sends after we cleared the truncation buffer */
 105         if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE &&
 106             !wsi->trunc_len)
 107                 return len;
 108
 109         if (wsi->trunc_len && (buf < wsi->trunc_alloc ||
 110             buf > (wsi->trunc_alloc + wsi->trunc_len + wsi->trunc_offset))) {
 111                 char dump[20];
 112                 strncpy(dump, (char *)buf, sizeof(dump) - 1);
 113                 dump[sizeof(dump) - 1] = '\0';
 114 #if defined(LWS_WITH_ESP8266)
 115                 lwsl_err("****** %p: Sending new %d (%s), pending truncated ...\n",
 116                          wsi, len, dump);
 117 #else
 118                 lwsl_err("****** %p: Sending new %d (%s), pending truncated ...\n"
 119                          "       It's illegal to do an lws_write outside of\n"
 120                          "       the writable callback: fix your code",
 121                          wsi, len, dump);
 122 #endif
 123                 assert(0);
 124
 125                 return -1;
 126         }
 127
 128         m = lws_ext_cb_active(wsi, LWS_EXT_CB_PACKET_TX_DO_SEND, &buf, len);
 129         if (m < 0)
 130                 return -1;
 131         if (m) /* handled */ {
 132                 n = m;
 133                 goto handle_truncated_send;
 134         }
 135
 136         if (!lws_socket_is_valid(wsi->sock))
 137                 lwsl_warn("** error invalid sock but expected to send\n");
 138
 139         /* limit sending */
 140         n = wsi->protocol->rx_buffer_size;
 141         if (!n)
 142                 n = context->pt_serv_buf_size;
 143         n += LWS_PRE + 4;
 144         if (n > len)
 145                 n = len;
 146 #if defined(LWS_WITH_ESP8266)
 147         if (wsi->pending_send_completion) {
 148                 n = 0;
 149                 goto handle_truncated_send;
 150         }
 151 #endif
 152
 153         /* nope, send it on the socket directly */
 154         lws_latency_pre(context, wsi);
 155         n = lws_ssl_capable_write(wsi, buf, n);
 156         lws_latency(context, wsi, "send lws_issue_raw", n, n == len);
 157
 158         switch (n) {
 159         case LWS_SSL_CAPABLE_ERROR:
 160                 /* we're going to close, let close know sends aren't possible */
 161                 wsi->socket_is_permanently_unusable = 1;
 162                 return -1;
 163         case LWS_SSL_CAPABLE_MORE_SERVICE:
 164                 /* nothing got sent, not fatal, retry the whole thing later */
 165                 n = 0;
 166                 break;
 167         }
 168
 169 handle_truncated_send:
 170         /*
 171          * we were already handling a truncated send?
 172          */
 173         if (wsi->trunc_len) {
 174                 lwsl_info("%p partial adv %d (vs %d)\n", wsi, n, real_len);
 175                 wsi->trunc_offset += n;
 176                 wsi->trunc_len -= n;
 177
 178                 if (!wsi->trunc_len) {
 179                         lwsl_info("***** %x partial send completed\n", wsi);
 180                         /* done with it, but don't free it */
 181                         n = real_len;
 182                         if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
 183                                 lwsl_info("***** %x signalling to close now\n", wsi);
 184                                 return -1; /* retry closing now */
 185                         }
 186                 }
 187                 /* always callback on writeable */
 188                 lws_callback_on_writable(wsi);
 189
 190                 return n;
 191         }
 192
 193         if ((unsigned int)n == real_len)
 194                 /* what we just sent went out cleanly */
 195                 return n;
 196
 197         /*
 198          * Newly truncated send.  Buffer the remainder (it will get
 199          * first priority next time the socket is writable)
 200          */
 201         lwsl_notice("%p new partial sent %d from %d total\n", wsi, n, real_len);
 202
 203         /*
 204          *  - if we still have a suitable malloc lying around, use it
 205          *  - or, if too small, reallocate it
 206          *  - or, if no buffer, create it
 207          */
 208         if (!wsi->trunc_alloc || real_len - n > wsi->trunc_alloc_len) {
 209                 lws_free(wsi->trunc_alloc);
 210
 211                 wsi->trunc_alloc_len = real_len - n;
 212                 wsi->trunc_alloc = lws_malloc(real_len - n);
 213                 if (!wsi->trunc_alloc) {
 214                         lwsl_err("truncated send: unable to malloc %d\n",
 215                                  real_len - n);
 216                         return -1;
 217                 }
 218         }
 219         wsi->trunc_offset = 0;
 220         wsi->trunc_len = real_len - n;
 221         memcpy(wsi->trunc_alloc, buf + n, real_len - n);
 222
 223         /* since something buffered, force it to get another chance to send */
 224         lws_callback_on_writable(wsi);
 225
 226         return real_len;
 227 }
 228
 229 LWS_VISIBLE int lws_write(struct lws *wsi, unsigned char *buf, size_t len,
 230                           enum lws_write_protocol wp)
 231 {
 232         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
 233         int masked7 = (wsi->mode == LWSCM_WS_CLIENT);
 234         unsigned char is_masked_bit = 0;
 235         unsigned char *dropmask = NULL;
 236         struct lws_tokens eff_buf;
 237         int pre = 0, n;
 238         size_t orig_len = len;
 239
 240 #ifdef LWS_WITH_ACCESS_LOG
 241         wsi->access_log.sent += len;
 242 #endif
 243         if (wsi->vhost)
 244                 wsi->vhost->tx += len;
 245
 246         if (wsi->state == LWSS_ESTABLISHED && wsi->u.ws.tx_draining_ext) {
 247                 /* remove us from the list */
 248                 struct lws **w = &pt->tx_draining_ext_list;
 249                 lwsl_debug("%s: TX EXT DRAINING: Remove from list\n", __func__);
 250                 wsi->u.ws.tx_draining_ext = 0;
 251                 /* remove us from context draining ext list */
 252                 while (*w) {
 253                         if (*w == wsi) {
 254                                 *w = wsi->u.ws.tx_draining_ext_list;
 255                                 break;
 256                         }
 257                         w = &((*w)->u.ws.tx_draining_ext_list);
 258                 }
 259                 wsi->u.ws.tx_draining_ext_list = NULL;
 260                 wp = (wsi->u.ws.tx_draining_stashed_wp & 0xc0) |
 261                                 LWS_WRITE_CONTINUATION;
 262
 263                 lwsl_ext("FORCED draining wp to 0x%02X\n", wp);
 264         }
 265
 266         lws_restart_ws_ping_pong_timer(wsi);
 267
 268         if (wp == LWS_WRITE_HTTP ||
 269             wp == LWS_WRITE_HTTP_FINAL ||
 270             wp == LWS_WRITE_HTTP_HEADERS)
 271                 goto send_raw;
 272
 273         /* if not in a state to send stuff, then just send nothing */
 274
 275         if (wsi->state != LWSS_ESTABLISHED &&
 276             ((wsi->state != LWSS_RETURNED_CLOSE_ALREADY &&
 277               wsi->state != LWSS_AWAITING_CLOSE_ACK) ||
 278                             wp != LWS_WRITE_CLOSE))
 279                 return 0;
 280
 281         /* if we are continuing a frame that already had its header done */
 282
 283         if (wsi->u.ws.inside_frame) {
 284                 lwsl_debug("INSIDE FRAME\n");
 285                 goto do_more_inside_frame;
 286         }
 287
 288         wsi->u.ws.clean_buffer = 1;
 289
 290         /*
 291          * give a chance to the extensions to modify payload
 292          * the extension may decide to produce unlimited payload erratically
 293          * (eg, compression extension), so we require only that if he produces
 294          * something, it will be a complete fragment of the length known at
 295          * the time (just the fragment length known), and if he has
 296          * more we will come back next time he is writeable and allow him to
 297          * produce more fragments until he's drained.
 298          *
 299          * This allows what is sent each time it is writeable to be limited to
 300          * a size that can be sent without partial sends or blocking, allows
 301          * interleaving of control frames and other connection service.
 302          */
 303         eff_buf.token = (char *)buf;
 304         eff_buf.token_len = len;
 305
 306         switch ((int)wp) {
 307         case LWS_WRITE_PING:
 308         case LWS_WRITE_PONG:
 309         case LWS_WRITE_CLOSE:
 310                 break;
 311         default:
 312                 n = lws_ext_cb_active(wsi, LWS_EXT_CB_PAYLOAD_TX, &eff_buf, wp);
 313                 if (n < 0)
 314                         return -1;
 315
 316                 if (n && eff_buf.token_len) {
 317                         /* extension requires further draining */
 318                         wsi->u.ws.tx_draining_ext = 1;
 319                         wsi->u.ws.tx_draining_ext_list = pt->tx_draining_ext_list;
 320                         pt->tx_draining_ext_list = wsi;
 321                         /* we must come back to do more */
 322                         lws_callback_on_writable(wsi);
 323                         /*
 324                          * keep a copy of the write type for the overall
 325                          * action that has provoked generation of these
 326                          * fragments, so the last guy can use its FIN state.
 327                          */
 328                         wsi->u.ws.tx_draining_stashed_wp = wp;
 329                         /* this is definitely not actually the last fragment
 330                          * because the extension asserted he has more coming
 331                          * So make sure this intermediate one doesn't go out
 332                          * with a FIN.
 333                          */
 334                         wp |= LWS_WRITE_NO_FIN;
 335                 }
 336
 337                 if (eff_buf.token_len && wsi->u.ws.stashed_write_pending) {
 338                         wsi->u.ws.stashed_write_pending = 0;
 339                         wp = (wp &0xc0) | (int)wsi->u.ws.stashed_write_type;
 340                 }
 341         }
 342
 343         /*
 344          * an extension did something we need to keep... for example, if
 345          * compression extension, it has already updated its state according
 346          * to this being issued
 347          */
 348         if ((char *)buf != eff_buf.token) {
 349                 /*
 350                  * ext might eat it, but no have anything to issue yet
 351                  * in that case we have to follow his lead, but stash and
 352                  * replace the write type that was lost here the first time.
 353                  */
 354                 if (len && !eff_buf.token_len) {
 355                         if (!wsi->u.ws.stashed_write_pending)
 356                                 wsi->u.ws.stashed_write_type = (char)wp & 0x3f;
 357                         wsi->u.ws.stashed_write_pending = 1;
 358                         return len;
 359                 }
 360                 /*
 361                  * extension recreated it:
 362                  * need to buffer this if not all sent
 363                  */
 364                 wsi->u.ws.clean_buffer = 0;
 365         }
 366
 367         buf = (unsigned char *)eff_buf.token;
 368         len = eff_buf.token_len;
 369
 370         switch (wsi->ietf_spec_revision) {
 371         case 13:
 372                 if (masked7) {
 373                         pre += 4;
 374                         dropmask = &buf[0 - pre];
 375                         is_masked_bit = 0x80;
 376                 }
 377
 378                 switch (wp & 0xf) {
 379                 case LWS_WRITE_TEXT:
 380                         n = LWSWSOPC_TEXT_FRAME;
 381                         break;
 382                 case LWS_WRITE_BINARY:
 383                         n = LWSWSOPC_BINARY_FRAME;
 384                         break;
 385                 case LWS_WRITE_CONTINUATION:
 386                         n = LWSWSOPC_CONTINUATION;
 387                         break;
 388
 389                 case LWS_WRITE_CLOSE:
 390                         n = LWSWSOPC_CLOSE;
 391                         break;
 392                 case LWS_WRITE_PING:
 393                         n = LWSWSOPC_PING;
 394                         break;
 395                 case LWS_WRITE_PONG:
 396                         n = LWSWSOPC_PONG;
 397                         break;
 398                 default:
 399                         lwsl_warn("lws_write: unknown write opc / wp\n");
 400                         return -1;
 401                 }
 402
 403                 if (!(wp & LWS_WRITE_NO_FIN))
 404                         n |= 1 << 7;
 405
 406                 if (len < 126) {
 407                         pre += 2;
 408                         buf[-pre] = n;
 409                         buf[-pre + 1] = (unsigned char)(len | is_masked_bit);
 410                 } else {
 411                         if (len < 65536) {
 412                                 pre += 4;
 413                                 buf[-pre] = n;
 414                                 buf[-pre + 1] = 126 | is_masked_bit;
 415                                 buf[-pre + 2] = (unsigned char)(len >> 8);
 416                                 buf[-pre + 3] = (unsigned char)len;
 417                         } else {
 418                                 pre += 10;
 419                                 buf[-pre] = n;
 420                                 buf[-pre + 1] = 127 | is_masked_bit;
 421 #if defined __LP64__
 422                                         buf[-pre + 2] = (len >> 56) & 0x7f;
 423                                         buf[-pre + 3] = len >> 48;
 424                                         buf[-pre + 4] = len >> 40;
 425                                         buf[-pre + 5] = len >> 32;
 426 #else
 427                                         buf[-pre + 2] = 0;
 428                                         buf[-pre + 3] = 0;
 429                                         buf[-pre + 4] = 0;
 430                                         buf[-pre + 5] = 0;
 431 #endif
 432                                 buf[-pre + 6] = (unsigned char)(len >> 24);
 433                                 buf[-pre + 7] = (unsigned char)(len >> 16);
 434                                 buf[-pre + 8] = (unsigned char)(len >> 8);
 435                                 buf[-pre + 9] = (unsigned char)len;
 436                         }
 437                 }
 438                 break;
 439         }
 440
 441 do_more_inside_frame:
 442
 443         /*
 444          * Deal with masking if we are in client -> server direction and
 445          * the wp demands it
 446          */
 447
 448         if (masked7) {
 449                 if (!wsi->u.ws.inside_frame)
 450                         if (lws_0405_frame_mask_generate(wsi)) {
 451                                 lwsl_err("frame mask generation failed\n");
 452                                 return -1;
 453                         }
 454
 455                 /*
 456                  * in v7, just mask the payload
 457                  */
 458                 if (dropmask) { /* never set if already inside frame */
 459                         for (n = 4; n < (int)len + 4; n++)
 460                                 dropmask[n] = dropmask[n] ^ wsi->u.ws.mask[
 461                                         (wsi->u.ws.mask_idx++) & 3];
 462
 463                         /* copy the frame nonce into place */
 464                         memcpy(dropmask, wsi->u.ws.mask, 4);
 465                 }
 466         }
 467
 468 send_raw:
 469         switch ((int)wp) {
 470         case LWS_WRITE_CLOSE:
 471 /*              lwsl_hexdump(&buf[-pre], len); */
 472         case LWS_WRITE_HTTP:
 473         case LWS_WRITE_HTTP_FINAL:
 474         case LWS_WRITE_HTTP_HEADERS:
 475         case LWS_WRITE_PONG:
 476         case LWS_WRITE_PING:
 477 #ifdef LWS_USE_HTTP2
 478                 if (wsi->mode == LWSCM_HTTP2_SERVING) {
 479                         unsigned char flags = 0;
 480
 481                         n = LWS_HTTP2_FRAME_TYPE_DATA;
 482                         if (wp == LWS_WRITE_HTTP_HEADERS) {
 483                                 n = LWS_HTTP2_FRAME_TYPE_HEADERS;
 484                                 flags = LWS_HTTP2_FLAG_END_HEADERS;
 485                                 if (wsi->u.http2.send_END_STREAM)
 486                                         flags |= LWS_HTTP2_FLAG_END_STREAM;
 487                         }
 488
 489                         if ((wp == LWS_WRITE_HTTP ||
 490                              wp == LWS_WRITE_HTTP_FINAL) &&
 491                             wsi->u.http.content_length) {
 492                                 wsi->u.http.content_remain -= len;
 493                                 lwsl_info("%s: content_remain = %lu\n", __func__,
 494                                           wsi->u.http.content_remain);
 495                                 if (!wsi->u.http.content_remain) {
 496                                         lwsl_info("%s: selecting final write mode\n", __func__);
 497                                         wp = LWS_WRITE_HTTP_FINAL;
 498                                 }
 499                         }
 500
 501                         if (wp == LWS_WRITE_HTTP_FINAL && wsi->u.http2.END_STREAM) {
 502                                 lwsl_info("%s: setting END_STREAM\n", __func__);
 503                                 flags |= LWS_HTTP2_FLAG_END_STREAM;
 504                         }
 505
 506                         return lws_http2_frame_write(wsi, n, flags,
 507                                         wsi->u.http2.my_stream_id, len, buf);
 508                 }
 509 #endif
 510                 return lws_issue_raw(wsi, (unsigned char *)buf - pre, len + pre);
 511         default:
 512                 break;
 513         }
 514
 515         /*
 516          * give any active extensions a chance to munge the buffer
 517          * before send.  We pass in a pointer to an lws_tokens struct
 518          * prepared with the default buffer and content length that's in
 519          * there.  Rather than rewrite the default buffer, extensions
 520          * that expect to grow the buffer can adapt .token to
 521          * point to their own per-connection buffer in the extension
 522          * user allocation.  By default with no extensions or no
 523          * extension callback handling, just the normal input buffer is
 524          * used then so it is efficient.
 525          *
 526          * callback returns 1 in case it wants to spill more buffers
 527          *
 528          * This takes care of holding the buffer if send is incomplete, ie,
 529          * if wsi->u.ws.clean_buffer is 0 (meaning an extension meddled with
 530          * the buffer).  If wsi->u.ws.clean_buffer is 1, it will instead
 531          * return to the user code how much OF THE USER BUFFER was consumed.
 532          */
 533
 534         n = lws_issue_raw_ext_access(wsi, buf - pre, len + pre);
 535         wsi->u.ws.inside_frame = 1;
 536         if (n <= 0)
 537                 return n;
 538
 539         if (n == (int)len + pre) {
 540                 /* everything in the buffer was handled (or rebuffered...) */
 541                 wsi->u.ws.inside_frame = 0;
 542                 return orig_len;
 543         }
 544
 545         /*
 546          * it is how many bytes of user buffer got sent... may be < orig_len
 547          * in which case callback when writable has already been arranged
 548          * and user code can call lws_write() again with the rest
 549          * later.
 550          */
 551
 552         return n - pre;
 553 }
 554
 555 LWS_VISIBLE int lws_serve_http_file_fragment(struct lws *wsi)
 556 {
 557         struct lws_context *context = wsi->context;
 558         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 559         struct lws_process_html_args args;
 560         unsigned long amount, poss;
 561         unsigned char *p = pt->serv_buf;
 562         int n, m;
 563
 564         // lwsl_notice("%s (trunc len %d)\n", __func__, wsi->trunc_len);
 565
 566         while (wsi->http2_substream || !lws_send_pipe_choked(wsi)) {
 567                 if (wsi->trunc_len) {
 568                         if (lws_issue_raw(wsi, wsi->trunc_alloc +
 569                                           wsi->trunc_offset,
 570                                           wsi->trunc_len) < 0) {
 571                                 lwsl_info("%s: closing\n", __func__);
 572                                 return -1;
 573                         }
 574                         continue;
 575                 }
 576
 577                 if (wsi->u.http.filepos == wsi->u.http.filelen)
 578                         goto all_sent;
 579
 580                 poss = context->pt_serv_buf_size;
 581
 582                 if (wsi->sending_chunked) {
 583                         /* we need to drop the chunk size in here */
 584                         p += 10;
 585                         /* allow for the chunk to grow by 128 in translation */
 586                         poss -= 10 + 128;
 587                 }
 588
 589                 if (lws_plat_file_read(wsi, wsi->u.http.fd, &amount, p, poss) < 0)
 590                         return -1; /* caller will close */
 591
 592                 //lwsl_notice("amount %ld\n", amount);
 593
 594                 n = (int)amount;
 595                 if (n) {
 596                         lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
 597                                         context->timeout_secs);
 598
 599                         if (wsi->sending_chunked) {
 600                                 args.p = (char *)p;
 601                                 args.len = n;
 602                                 args.max_len = poss + 128;
 603                                 args.final = wsi->u.http.filepos + n ==
 604                                              wsi->u.http.filelen;
 605                                 if (user_callback_handle_rxflow(
 606                                      wsi->vhost->protocols[(int)wsi->protocol_interpret_idx].callback, wsi,
 607                                      LWS_CALLBACK_PROCESS_HTML,
 608                                      wsi->user_space, &args, 0) < 0)
 609                                         return -1;
 610                                 n = args.len;
 611                                 p = (unsigned char *)args.p;
 612                         }
 613
 614                         m = lws_write(wsi, p, n,
 615                                       wsi->u.http.filepos == wsi->u.http.filelen ?
 616                                         LWS_WRITE_HTTP_FINAL :
 617                                         LWS_WRITE_HTTP
 618                                 );
 619                         if (m < 0)
 620                                 return -1;
 621
 622                         wsi->u.http.filepos += amount;
 623                         if (m != n) {
 624                                 /* adjust for what was not sent */
 625                                 if (lws_plat_file_seek_cur(wsi, wsi->u.http.fd,
 626                                                            m - n) ==
 627                                                              (unsigned long)-1)
 628                                         return -1;
 629                         }
 630                 }
 631 all_sent:
 632                 if (!wsi->trunc_len &&
 633                     wsi->u.http.filepos == wsi->u.http.filelen) {
 634                         wsi->state = LWSS_HTTP;
 635                         /* we might be in keepalive, so close it off here */
 636                         lws_plat_file_close(wsi, wsi->u.http.fd);
 637                         wsi->u.http.fd = LWS_INVALID_FILE;
 638
 639                         lwsl_notice("file completed\n");
 640
 641                         if (wsi->protocol->callback)
 642                                 /* ignore callback returned value */
 643                                 if (user_callback_handle_rxflow(
 644                                      wsi->protocol->callback, wsi,
 645                                      LWS_CALLBACK_HTTP_FILE_COMPLETION,
 646                                      wsi->user_space, NULL, 0) < 0)
 647                                         return -1;
 648
 649                         return 1;  /* >0 indicates completed */
 650                 }
 651         }
 652
 653         lws_callback_on_writable(wsi);
 654
 655         return 0; /* indicates further processing must be done */
 656 }
 657
 658 #if LWS_POSIX
 659 LWS_VISIBLE int
 660 lws_ssl_capable_read_no_ssl(struct lws *wsi, unsigned char *buf, int len)
 661 {
 662         int n;
 663
 664         n = recv(wsi->sock, (char *)buf, len, 0);
 665         if (n >= 0) {
 666                 if (wsi->vhost)
 667                         wsi->vhost->rx += n;
 668                 lws_restart_ws_ping_pong_timer(wsi);
 669                 return n;
 670         }
 671 #if LWS_POSIX
 672         if (LWS_ERRNO == LWS_EAGAIN ||
 673             LWS_ERRNO == LWS_EWOULDBLOCK ||
 674             LWS_ERRNO == LWS_EINTR)
 675                 return LWS_SSL_CAPABLE_MORE_SERVICE;
 676 #endif
 677         lwsl_notice("error on reading from skt : %d\n", LWS_ERRNO);
 678         return LWS_SSL_CAPABLE_ERROR;
 679 }
 680
 681 LWS_VISIBLE int
 682 lws_ssl_capable_write_no_ssl(struct lws *wsi, unsigned char *buf, int len)
 683 {
 684         int n = 0;
 685
 686 #if LWS_POSIX
 687         n = send(wsi->sock, (char *)buf, len, MSG_NOSIGNAL);
 688 //      lwsl_info("%s: sent len %d result %d", __func__, len, n);
 689         if (n >= 0)
 690                 return n;
 691
 692         if (LWS_ERRNO == LWS_EAGAIN ||
 693             LWS_ERRNO == LWS_EWOULDBLOCK ||
 694             LWS_ERRNO == LWS_EINTR) {
 695                 if (LWS_ERRNO == LWS_EWOULDBLOCK)
 696                         lws_set_blocking_send(wsi);
 697
 698                 return LWS_SSL_CAPABLE_MORE_SERVICE;
 699         }
 700 #else
 701         (void)n;
 702         (void)wsi;
 703         (void)buf;
 704         (void)len;
 705         // !!!
 706 #endif
 707
 708         lwsl_debug("ERROR writing len %d to skt fd %d err %d / errno %d\n", len, wsi->sock, n, LWS_ERRNO);
 709         return LWS_SSL_CAPABLE_ERROR;
 710 }
 711 #endif
 712 LWS_VISIBLE int
 713 lws_ssl_pending_no_ssl(struct lws *wsi)
 714 {
 715         (void)wsi;
 716         return 0;
 717 }