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 %lu (%s), pending truncated ...\n",
 116                          wsi, (unsigned long)len, dump);
 117 #else
 118                 lwsl_err("****** %p: Sending new %lu (%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, (unsigned long)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->desc.sockfd))
 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 %ld)\n", wsi, n, (long)real_len);
 175                 wsi->trunc_offset += n;
 176                 wsi->trunc_len -= n;
 177
 178                 if (!wsi->trunc_len) {
 179                         lwsl_info("***** %p 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("***** %p 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_info("%p new partial sent %d from %lu total\n", wsi, n,
 202                     (unsigned long)real_len);
 203
 204         /*
 205          *  - if we still have a suitable malloc lying around, use it
 206          *  - or, if too small, reallocate it
 207          *  - or, if no buffer, create it
 208          */
 209         if (!wsi->trunc_alloc || real_len - n > wsi->trunc_alloc_len) {
 210                 lws_free(wsi->trunc_alloc);
 211
 212                 wsi->trunc_alloc_len = real_len - n;
 213                 wsi->trunc_alloc = lws_malloc(real_len - n);
 214                 if (!wsi->trunc_alloc) {
 215                         lwsl_err("truncated send: unable to malloc %lu\n",
 216                                  (unsigned long)(real_len - n));
 217                         return -1;
 218                 }
 219         }
 220         wsi->trunc_offset = 0;
 221         wsi->trunc_len = real_len - n;
 222         memcpy(wsi->trunc_alloc, buf + n, real_len - n);
 223
 224         /* since something buffered, force it to get another chance to send */
 225         lws_callback_on_writable(wsi);
 226
 227         return real_len;
 228 }
 229
 230 LWS_VISIBLE int lws_write(struct lws *wsi, unsigned char *buf, size_t len,
 231                           enum lws_write_protocol wp)
 232 {
 233         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
 234         int masked7 = (wsi->mode == LWSCM_WS_CLIENT);
 235         unsigned char is_masked_bit = 0;
 236         unsigned char *dropmask = NULL;
 237         struct lws_tokens eff_buf;
 238         int pre = 0, n;
 239         size_t orig_len = len;
 240
 241 #ifdef LWS_WITH_ACCESS_LOG
 242         wsi->access_log.sent += len;
 243 #endif
 244         if (wsi->vhost)
 245                 wsi->vhost->conn_stats.tx += len;
 246
 247         if (wsi->state == LWSS_ESTABLISHED && wsi->u.ws.tx_draining_ext) {
 248                 /* remove us from the list */
 249                 struct lws **w = &pt->tx_draining_ext_list;
 250                 lwsl_debug("%s: TX EXT DRAINING: Remove from list\n", __func__);
 251                 wsi->u.ws.tx_draining_ext = 0;
 252                 /* remove us from context draining ext list */
 253                 while (*w) {
 254                         if (*w == wsi) {
 255                                 *w = wsi->u.ws.tx_draining_ext_list;
 256                                 break;
 257                         }
 258                         w = &((*w)->u.ws.tx_draining_ext_list);
 259                 }
 260                 wsi->u.ws.tx_draining_ext_list = NULL;
 261                 wp = (wsi->u.ws.tx_draining_stashed_wp & 0xc0) |
 262                                 LWS_WRITE_CONTINUATION;
 263
 264                 lwsl_ext("FORCED draining wp to 0x%02X\n", wp);
 265         }
 266
 267         lws_restart_ws_ping_pong_timer(wsi);
 268
 269         if (wp == LWS_WRITE_HTTP ||
 270             wp == LWS_WRITE_HTTP_FINAL ||
 271             wp == LWS_WRITE_HTTP_HEADERS)
 272                 goto send_raw;
 273
 274         /* if not in a state to send stuff, then just send nothing */
 275
 276         if (wsi->state != LWSS_ESTABLISHED &&
 277             ((wsi->state != LWSS_RETURNED_CLOSE_ALREADY &&
 278               wsi->state != LWSS_AWAITING_CLOSE_ACK) ||
 279                             wp != LWS_WRITE_CLOSE))
 280                 return 0;
 281
 282         /* if we are continuing a frame that already had its header done */
 283
 284         if (wsi->u.ws.inside_frame) {
 285                 lwsl_debug("INSIDE FRAME\n");
 286                 goto do_more_inside_frame;
 287         }
 288
 289         wsi->u.ws.clean_buffer = 1;
 290
 291         /*
 292          * give a chance to the extensions to modify payload
 293          * the extension may decide to produce unlimited payload erratically
 294          * (eg, compression extension), so we require only that if he produces
 295          * something, it will be a complete fragment of the length known at
 296          * the time (just the fragment length known), and if he has
 297          * more we will come back next time he is writeable and allow him to
 298          * produce more fragments until he's drained.
 299          *
 300          * This allows what is sent each time it is writeable to be limited to
 301          * a size that can be sent without partial sends or blocking, allows
 302          * interleaving of control frames and other connection service.
 303          */
 304         eff_buf.token = (char *)buf;
 305         eff_buf.token_len = len;
 306
 307         switch ((int)wp) {
 308         case LWS_WRITE_PING:
 309         case LWS_WRITE_PONG:
 310         case LWS_WRITE_CLOSE:
 311                 break;
 312         default:
 313                 n = lws_ext_cb_active(wsi, LWS_EXT_CB_PAYLOAD_TX, &eff_buf, wp);
 314                 if (n < 0)
 315                         return -1;
 316
 317                 if (n && eff_buf.token_len) {
 318                         /* extension requires further draining */
 319                         wsi->u.ws.tx_draining_ext = 1;
 320                         wsi->u.ws.tx_draining_ext_list = pt->tx_draining_ext_list;
 321                         pt->tx_draining_ext_list = wsi;
 322                         /* we must come back to do more */
 323                         lws_callback_on_writable(wsi);
 324                         /*
 325                          * keep a copy of the write type for the overall
 326                          * action that has provoked generation of these
 327                          * fragments, so the last guy can use its FIN state.
 328                          */
 329                         wsi->u.ws.tx_draining_stashed_wp = wp;
 330                         /* this is definitely not actually the last fragment
 331                          * because the extension asserted he has more coming
 332                          * So make sure this intermediate one doesn't go out
 333                          * with a FIN.
 334                          */
 335                         wp |= LWS_WRITE_NO_FIN;
 336                 }
 337
 338                 if (eff_buf.token_len && wsi->u.ws.stashed_write_pending) {
 339                         wsi->u.ws.stashed_write_pending = 0;
 340                         wp = (wp &0xc0) | (int)wsi->u.ws.stashed_write_type;
 341                 }
 342         }
 343
 344         /*
 345          * an extension did something we need to keep... for example, if
 346          * compression extension, it has already updated its state according
 347          * to this being issued
 348          */
 349         if ((char *)buf != eff_buf.token) {
 350                 /*
 351                  * ext might eat it, but no have anything to issue yet
 352                  * in that case we have to follow his lead, but stash and
 353                  * replace the write type that was lost here the first time.
 354                  */
 355                 if (len && !eff_buf.token_len) {
 356                         if (!wsi->u.ws.stashed_write_pending)
 357                                 wsi->u.ws.stashed_write_type = (char)wp & 0x3f;
 358                         wsi->u.ws.stashed_write_pending = 1;
 359                         return len;
 360                 }
 361                 /*
 362                  * extension recreated it:
 363                  * need to buffer this if not all sent
 364                  */
 365                 wsi->u.ws.clean_buffer = 0;
 366         }
 367
 368         buf = (unsigned char *)eff_buf.token;
 369         len = eff_buf.token_len;
 370
 371         switch (wsi->ietf_spec_revision) {
 372         case 13:
 373                 if (masked7) {
 374                         pre += 4;
 375                         dropmask = &buf[0 - pre];
 376                         is_masked_bit = 0x80;
 377                 }
 378
 379                 switch (wp & 0xf) {
 380                 case LWS_WRITE_TEXT:
 381                         n = LWSWSOPC_TEXT_FRAME;
 382                         break;
 383                 case LWS_WRITE_BINARY:
 384                         n = LWSWSOPC_BINARY_FRAME;
 385                         break;
 386                 case LWS_WRITE_CONTINUATION:
 387                         n = LWSWSOPC_CONTINUATION;
 388                         break;
 389
 390                 case LWS_WRITE_CLOSE:
 391                         n = LWSWSOPC_CLOSE;
 392                         break;
 393                 case LWS_WRITE_PING:
 394                         n = LWSWSOPC_PING;
 395                         break;
 396                 case LWS_WRITE_PONG:
 397                         n = LWSWSOPC_PONG;
 398                         break;
 399                 default:
 400                         lwsl_warn("lws_write: unknown write opc / wp\n");
 401                         return -1;
 402                 }
 403
 404                 if (!(wp & LWS_WRITE_NO_FIN))
 405                         n |= 1 << 7;
 406
 407                 if (len < 126) {
 408                         pre += 2;
 409                         buf[-pre] = n;
 410                         buf[-pre + 1] = (unsigned char)(len | is_masked_bit);
 411                 } else {
 412                         if (len < 65536) {
 413                                 pre += 4;
 414                                 buf[-pre] = n;
 415                                 buf[-pre + 1] = 126 | is_masked_bit;
 416                                 buf[-pre + 2] = (unsigned char)(len >> 8);
 417                                 buf[-pre + 3] = (unsigned char)len;
 418                         } else {
 419                                 pre += 10;
 420                                 buf[-pre] = n;
 421                                 buf[-pre + 1] = 127 | is_masked_bit;
 422 #if defined __LP64__
 423                                         buf[-pre + 2] = (len >> 56) & 0x7f;
 424                                         buf[-pre + 3] = len >> 48;
 425                                         buf[-pre + 4] = len >> 40;
 426                                         buf[-pre + 5] = len >> 32;
 427 #else
 428                                         buf[-pre + 2] = 0;
 429                                         buf[-pre + 3] = 0;
 430                                         buf[-pre + 4] = 0;
 431                                         buf[-pre + 5] = 0;
 432 #endif
 433                                 buf[-pre + 6] = (unsigned char)(len >> 24);
 434                                 buf[-pre + 7] = (unsigned char)(len >> 16);
 435                                 buf[-pre + 8] = (unsigned char)(len >> 8);
 436                                 buf[-pre + 9] = (unsigned char)len;
 437                         }
 438                 }
 439                 break;
 440         }
 441
 442 do_more_inside_frame:
 443
 444         /*
 445          * Deal with masking if we are in client -> server direction and
 446          * the wp demands it
 447          */
 448
 449         if (masked7) {
 450                 if (!wsi->u.ws.inside_frame)
 451                         if (lws_0405_frame_mask_generate(wsi)) {
 452                                 lwsl_err("frame mask generation failed\n");
 453                                 return -1;
 454                         }
 455
 456                 /*
 457                  * in v7, just mask the payload
 458                  */
 459                 if (dropmask) { /* never set if already inside frame */
 460                         for (n = 4; n < (int)len + 4; n++)
 461                                 dropmask[n] = dropmask[n] ^ wsi->u.ws.mask[
 462                                         (wsi->u.ws.mask_idx++) & 3];
 463
 464                         /* copy the frame nonce into place */
 465                         memcpy(dropmask, wsi->u.ws.mask, 4);
 466                 }
 467         }
 468
 469 send_raw:
 470         switch ((int)wp) {
 471         case LWS_WRITE_CLOSE:
 472 /*              lwsl_hexdump(&buf[-pre], len); */
 473         case LWS_WRITE_HTTP:
 474         case LWS_WRITE_HTTP_FINAL:
 475         case LWS_WRITE_HTTP_HEADERS:
 476         case LWS_WRITE_PONG:
 477         case LWS_WRITE_PING:
 478 #ifdef LWS_USE_HTTP2
 479                 if (wsi->mode == LWSCM_HTTP2_SERVING) {
 480                         unsigned char flags = 0;
 481
 482                         n = LWS_HTTP2_FRAME_TYPE_DATA;
 483                         if (wp == LWS_WRITE_HTTP_HEADERS) {
 484                                 n = LWS_HTTP2_FRAME_TYPE_HEADERS;
 485                                 flags = LWS_HTTP2_FLAG_END_HEADERS;
 486                                 if (wsi->u.http2.send_END_STREAM)
 487                                         flags |= LWS_HTTP2_FLAG_END_STREAM;
 488                         }
 489
 490                         if ((wp == LWS_WRITE_HTTP ||
 491                              wp == LWS_WRITE_HTTP_FINAL) &&
 492                             wsi->u.http.content_length) {
 493                                 wsi->u.http.content_remain -= len;
 494                                 lwsl_info("%s: content_remain = %lu\n", __func__,
 495                                           wsi->u.http.content_remain);
 496                                 if (!wsi->u.http.content_remain) {
 497                                         lwsl_info("%s: selecting final write mode\n", __func__);
 498                                         wp = LWS_WRITE_HTTP_FINAL;
 499                                 }
 500                         }
 501
 502                         if (wp == LWS_WRITE_HTTP_FINAL && wsi->u.http2.END_STREAM) {
 503                                 lwsl_info("%s: setting END_STREAM\n", __func__);
 504                                 flags |= LWS_HTTP2_FLAG_END_STREAM;
 505                         }
 506
 507                         return lws_http2_frame_write(wsi, n, flags,
 508                                         wsi->u.http2.my_stream_id, len, buf);
 509                 }
 510 #endif
 511                 return lws_issue_raw(wsi, (unsigned char *)buf - pre, len + pre);
 512         default:
 513                 break;
 514         }
 515
 516         /*
 517          * give any active extensions a chance to munge the buffer
 518          * before send.  We pass in a pointer to an lws_tokens struct
 519          * prepared with the default buffer and content length that's in
 520          * there.  Rather than rewrite the default buffer, extensions
 521          * that expect to grow the buffer can adapt .token to
 522          * point to their own per-connection buffer in the extension
 523          * user allocation.  By default with no extensions or no
 524          * extension callback handling, just the normal input buffer is
 525          * used then so it is efficient.
 526          *
 527          * callback returns 1 in case it wants to spill more buffers
 528          *
 529          * This takes care of holding the buffer if send is incomplete, ie,
 530          * if wsi->u.ws.clean_buffer is 0 (meaning an extension meddled with
 531          * the buffer).  If wsi->u.ws.clean_buffer is 1, it will instead
 532          * return to the user code how much OF THE USER BUFFER was consumed.
 533          */
 534
 535         n = lws_issue_raw_ext_access(wsi, buf - pre, len + pre);
 536         wsi->u.ws.inside_frame = 1;
 537         if (n <= 0)
 538                 return n;
 539
 540         if (n == (int)len + pre) {
 541                 /* everything in the buffer was handled (or rebuffered...) */
 542                 wsi->u.ws.inside_frame = 0;
 543                 return orig_len;
 544         }
 545
 546         /*
 547          * it is how many bytes of user buffer got sent... may be < orig_len
 548          * in which case callback when writable has already been arranged
 549          * and user code can call lws_write() again with the rest
 550          * later.
 551          */
 552
 553         return n - pre;
 554 }
 555
 556 LWS_VISIBLE int lws_serve_http_file_fragment(struct lws *wsi)
 557 {
 558         struct lws_context *context = wsi->context;
 559         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 560         struct lws_process_html_args args;
 561         lws_filepos_t amount, poss;
 562         unsigned char *p;
 563 #if defined(LWS_WITH_RANGES)
 564         unsigned char finished = 0;
 565 #endif
 566         int n, m;
 567
 568         // lwsl_notice("%s (trunc len %d)\n", __func__, wsi->trunc_len);
 569
 570         while (wsi->http2_substream || !lws_send_pipe_choked(wsi)) {
 571
 572                 if (wsi->trunc_len) {
 573                         if (lws_issue_raw(wsi, wsi->trunc_alloc +
 574                                           wsi->trunc_offset,
 575                                           wsi->trunc_len) < 0) {
 576                                 lwsl_info("%s: closing\n", __func__);
 577                                 return -1;
 578                         }
 579                         continue;
 580                 }
 581
 582                 if (wsi->u.http.filepos == wsi->u.http.filelen)
 583                         goto all_sent;
 584
 585                 n = 0;
 586
 587                 p = pt->serv_buf;
 588
 589 #if defined(LWS_WITH_RANGES)
 590                 if (wsi->u.http.range.count_ranges && !wsi->u.http.range.inside) {
 591
 592                         lwsl_notice("%s: doing range start %llu\n", __func__, wsi->u.http.range.start);
 593
 594                         if ((long)lws_plat_file_seek_cur(wsi->u.http.fop_fd,
 595                                                    wsi->u.http.range.start -
 596                                                    wsi->u.http.filepos) < 0)
 597                                 return -1;
 598
 599                         wsi->u.http.filepos = wsi->u.http.range.start;
 600
 601                         if (wsi->u.http.range.count_ranges > 1) {
 602                                 n =  lws_snprintf((char *)p, context->pt_serv_buf_size,
 603                                         "_lws\x0d\x0a"
 604                                         "Content-Type: %s\x0d\x0a"
 605                                         "Content-Range: bytes %llu-%llu/%llu\x0d\x0a"
 606                                         "\x0d\x0a",
 607                                         wsi->u.http.multipart_content_type,
 608                                         wsi->u.http.range.start,
 609                                         wsi->u.http.range.end,
 610                                         wsi->u.http.range.extent);
 611                                 p += n;
 612                         }
 613
 614                         wsi->u.http.range.budget = wsi->u.http.range.end -
 615                                                    wsi->u.http.range.start + 1;
 616                         wsi->u.http.range.inside = 1;
 617                 }
 618 #endif
 619
 620                 poss = context->pt_serv_buf_size - n;
 621 #if defined(LWS_WITH_RANGES)
 622                 if (wsi->u.http.range.count_ranges) {
 623                         if (wsi->u.http.range.count_ranges > 1)
 624                                 poss -= 7; /* allow for final boundary */
 625                         if (poss > wsi->u.http.range.budget)
 626                                 poss = wsi->u.http.range.budget;
 627                 }
 628 #endif
 629                 if (wsi->sending_chunked) {
 630                         /* we need to drop the chunk size in here */
 631                         p += 10;
 632                         /* allow for the chunk to grow by 128 in translation */
 633                         poss -= 10 + 128;
 634                 }
 635
 636                 if (lws_plat_file_read(wsi->u.http.fop_fd, &amount, p, poss) < 0)
 637                         return -1; /* caller will close */
 638
 639                 //lwsl_notice("amount %ld\n", amount);
 640
 641                 if (wsi->sending_chunked)
 642                         n = (int)amount;
 643                 else
 644                         n = (p - pt->serv_buf) + (int)amount;
 645                 if (n) {
 646                         lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
 647                                         context->timeout_secs);
 648
 649                         if (wsi->sending_chunked) {
 650                                 args.p = (char *)p;
 651                                 args.len = n;
 652                                 args.max_len = poss + 128;
 653                                 args.final = wsi->u.http.filepos + n ==
 654                                              wsi->u.http.filelen;
 655                                 if (user_callback_handle_rxflow(
 656                                      wsi->vhost->protocols[(int)wsi->protocol_interpret_idx].callback, wsi,
 657                                      LWS_CALLBACK_PROCESS_HTML,
 658                                      wsi->user_space, &args, 0) < 0)
 659                                         return -1;
 660                                 n = args.len;
 661                                 p = (unsigned char *)args.p;
 662                         } else
 663                                 p = pt->serv_buf;
 664
 665 #if defined(LWS_WITH_RANGES)
 666                         if (wsi->u.http.range.send_ctr + 1 ==
 667                                 wsi->u.http.range.count_ranges && // last range
 668                             wsi->u.http.range.count_ranges > 1 && // was 2+ ranges (ie, multipart)
 669                             wsi->u.http.range.budget - amount == 0) {// final part
 670                                 n += lws_snprintf((char *)pt->serv_buf + n, 6,
 671                                         "_lws\x0d\x0a"); // append trailing boundary
 672                                 lwsl_debug("added trailing boundary\n");
 673                         }
 674 #endif
 675                         m = lws_write(wsi, p, n,
 676                                       wsi->u.http.filepos == wsi->u.http.filelen ?
 677                                         LWS_WRITE_HTTP_FINAL :
 678                                         LWS_WRITE_HTTP
 679                                 );
 680                         if (m < 0)
 681                                 return -1;
 682
 683                         wsi->u.http.filepos += amount;
 684
 685 #if defined(LWS_WITH_RANGES)
 686                         if (wsi->u.http.range.count_ranges >= 1) {
 687                                 wsi->u.http.range.budget -= amount;
 688                                 if (wsi->u.http.range.budget == 0) {
 689                                         lwsl_notice("range budget exhausted\n");
 690                                         wsi->u.http.range.inside = 0;
 691                                         wsi->u.http.range.send_ctr++;
 692
 693                                         if (lws_ranges_next(&wsi->u.http.range) < 1) {
 694                                                 finished = 1;
 695                                                 goto all_sent;
 696                                         }
 697                                 }
 698                         }
 699 #endif
 700
 701                         if (m != n) {
 702                                 /* adjust for what was not sent */
 703                                 if (lws_plat_file_seek_cur(wsi->u.http.fop_fd,
 704                                                            m - n) ==
 705                                                              (unsigned long)-1)
 706                                         return -1;
 707                         }
 708                 }
 709 all_sent:
 710                 if ((!wsi->trunc_len && wsi->u.http.filepos == wsi->u.http.filelen)
 711 #if defined(LWS_WITH_RANGES)
 712                     || finished)
 713 #else
 714                 )
 715 #endif
 716                      {
 717                         wsi->state = LWSS_HTTP;
 718                         /* we might be in keepalive, so close it off here */
 719                         lws_plat_file_close(wsi->u.http.fop_fd);
 720                         wsi->u.http.fop_fd = NULL;
 721
 722                         lwsl_debug("file completed\n");
 723
 724                         if (wsi->protocol->callback)
 725                                 /* ignore callback returned value */
 726                                 if (user_callback_handle_rxflow(
 727                                      wsi->protocol->callback, wsi,
 728                                      LWS_CALLBACK_HTTP_FILE_COMPLETION,
 729                                      wsi->user_space, NULL, 0) < 0)
 730                                         return -1;
 731
 732                         return 1;  /* >0 indicates completed */
 733                 }
 734         }
 735
 736         lws_callback_on_writable(wsi);
 737
 738         return 0; /* indicates further processing must be done */
 739 }
 740
 741 #if LWS_POSIX
 742 LWS_VISIBLE int
 743 lws_ssl_capable_read_no_ssl(struct lws *wsi, unsigned char *buf, int len)
 744 {
 745         int n;
 746
 747         n = recv(wsi->desc.sockfd, (char *)buf, len, 0);
 748         if (n >= 0) {
 749                 if (wsi->vhost)
 750                         wsi->vhost->conn_stats.rx += n;
 751                 lws_restart_ws_ping_pong_timer(wsi);
 752                 return n;
 753         }
 754 #if LWS_POSIX
 755         if (LWS_ERRNO == LWS_EAGAIN ||
 756             LWS_ERRNO == LWS_EWOULDBLOCK ||
 757             LWS_ERRNO == LWS_EINTR)
 758                 return LWS_SSL_CAPABLE_MORE_SERVICE;
 759 #endif
 760         lwsl_notice("error on reading from skt : %d\n", LWS_ERRNO);
 761         return LWS_SSL_CAPABLE_ERROR;
 762 }
 763
 764 LWS_VISIBLE int
 765 lws_ssl_capable_write_no_ssl(struct lws *wsi, unsigned char *buf, int len)
 766 {
 767         int n = 0;
 768
 769 #if LWS_POSIX
 770         n = send(wsi->desc.sockfd, (char *)buf, len, MSG_NOSIGNAL);
 771 //      lwsl_info("%s: sent len %d result %d", __func__, len, n);
 772         if (n >= 0)
 773                 return n;
 774
 775         if (LWS_ERRNO == LWS_EAGAIN ||
 776             LWS_ERRNO == LWS_EWOULDBLOCK ||
 777             LWS_ERRNO == LWS_EINTR) {
 778                 if (LWS_ERRNO == LWS_EWOULDBLOCK) {
 779                         lws_set_blocking_send(wsi);
 780                 }
 781
 782                 return LWS_SSL_CAPABLE_MORE_SERVICE;
 783         }
 784 #else
 785         (void)n;
 786         (void)wsi;
 787         (void)buf;
 788         (void)len;
 789         // !!!
 790 #endif
 791
 792         lwsl_debug("ERROR writing len %d to skt fd %d err %d / errno %d\n", len, wsi->desc.sockfd, n, LWS_ERRNO);
 793         return LWS_SSL_CAPABLE_ERROR;
 794 }
 795 #endif
 796 LWS_VISIBLE int
 797 lws_ssl_pending_no_ssl(struct lws *wsi)
 798 {
 799         (void)wsi;
 800         return 1;
 801 }