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   1 /*
   2  * httpread - Manage reading file(s) from HTTP/TCP socket
   3  * Author: Ted Merrill
   4  * Copyright 2008 Atheros Communications
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Alternatively, this software may be distributed under the terms of BSD
  11  * license.
  12  *
  13  * See README and COPYING for more details.
  14  *
  15  * The files are buffered via internal callbacks from eloop, then presented to
  16  * an application callback routine when completely read into memory. May also
  17  * be used if no file is expected but just to get the header, including HTTP
  18  * replies (e.g. HTTP/1.1 200 OK etc.).
  19  *
  20  * This does not attempt to be an optimally efficient implementation, but does
  21  * attempt to be of reasonably small size and memory consumption; assuming that
  22  * only small files are to be read. A maximum file size is provided by
  23  * application and enforced.
  24  *
  25  * It is assumed that the application does not expect any of the following:
  26  * -- transfer encoding other than chunked
  27  * -- trailer fields
  28  * It is assumed that, even if the other side requested that the connection be
  29  * kept open, that we will close it (thus HTTP messages sent by application
  30  * should have the connection closed field); this is allowed by HTTP/1.1 and
  31  * simplifies things for us.
  32  *
  33  * Other limitations:
  34  * -- HTTP header may not exceed a hard-coded size.
  35  *
  36  * Notes:
  37  * This code would be massively simpler without some of the new features of
  38  * HTTP/1.1, especially chunked data.
  39  */
  40
  41 #include "includes.h"
  42
  43 #include "common.h"
  44 #include "eloop.h"
  45 #include "httpread.h"
  46
  47
  48 /* Tunable parameters */
  49 #define HTTPREAD_READBUF_SIZE 1024      /* read in chunks of this size */
  50 #define HTTPREAD_HEADER_MAX_SIZE 4096   /* max allowed for headers */
  51 #define HTTPREAD_BODYBUF_DELTA 4096     /* increase allocation by this */
  52
  53 #if 0
  54 /* httpread_debug -- set this global variable > 0 e.g. from debugger
  55  * to enable debugs (larger numbers for more debugs)
  56  * Make this a #define of 0 to eliminate the debugging code.
  57  */
  58 int httpread_debug = 99;
  59 #else
  60 #define httpread_debug 0        /* eliminates even the debugging code */
  61 #endif
  62
  63
  64 /* control instance -- actual definition (opaque to application)
  65  */
  66 struct httpread {
  67         /* information from creation */
  68         int sd;         /* descriptor of TCP socket to read from */
  69         void (*cb)(struct httpread *handle, void *cookie,
  70                     enum httpread_event e);  /* call on event */
  71         void *cookie;   /* pass to callback */
  72         int max_bytes;          /* maximum file size else abort it */
  73         int timeout_seconds;            /* 0 or total duration timeout period */
  74
  75         /* dynamically used information follows */
  76         int sd_registered;      /* nonzero if we need to unregister socket */
  77         int to_registered;      /* nonzero if we need to unregister timeout */
  78
  79         int got_hdr;            /* nonzero when header is finalized */
  80         char hdr[HTTPREAD_HEADER_MAX_SIZE+1];   /* headers stored here */
  81         int hdr_nbytes;
  82
  83         enum httpread_hdr_type hdr_type;
  84         int version;            /* 1 if we've seen 1.1 */
  85         int reply_code;         /* for type REPLY, e.g. 200 for HTTP/1.1 200 OK */
  86         int got_content_length; /* true if we know content length for sure */
  87         int content_length;     /* body length,  iff got_content_length */
  88         int chunked;            /* nonzero for chunked data */
  89         char *uri;
  90
  91         int got_body;           /* nonzero when body is finalized */
  92         char *body;
  93         int body_nbytes;
  94         int body_alloc_nbytes;  /* amount allocated */
  95
  96         int got_file;           /* here when we are done */
  97
  98         /* The following apply if data is chunked: */
  99         int in_chunk_data;      /* 0=in/at header, 1=in the data or tail*/
 100         int chunk_start;        /* offset in body of chunk hdr or data */
 101         int chunk_size;         /* data of chunk (not hdr or ending CRLF)*/
 102         int in_trailer;         /* in header fields after data (chunked only)*/
 103         enum trailer_state {
 104                 trailer_line_begin = 0,
 105                 trailer_empty_cr,       /* empty line + CR */
 106                 trailer_nonempty,
 107                 trailer_nonempty_cr,
 108         } trailer_state;
 109 };
 110
 111
 112 /* Check words for equality, where words consist of graphical characters
 113  * delimited by whitespace
 114  * Returns nonzero if "equal" doing case insensitive comparison.
 115  */
 116 static int word_eq(char *s1, char *s2)
 117 {
 118         int c1;
 119         int c2;
 120         int end1 = 0;
 121         int end2 = 0;
 122         for (;;) {
 123                 c1 = *s1++;
 124                 c2 = *s2++;
 125                 if (isalpha(c1) && isupper(c1))
 126                         c1 = tolower(c1);
 127                 if (isalpha(c2) && isupper(c2))
 128                         c2 = tolower(c2);
 129                 end1 = !isgraph(c1);
 130                 end2 = !isgraph(c2);
 131                 if (end1 || end2 || c1 != c2)
 132                         break;
 133         }
 134         return end1 && end2;  /* reached end of both words? */
 135 }
 136
 137
 138 /* convert hex to binary
 139  * Requires that c have been previously tested true with isxdigit().
 140  */
 141 static int hex_value(int c)
 142 {
 143         if (isdigit(c))
 144                 return c - '0';
 145         if (islower(c))
 146                 return 10 + c - 'a';
 147         return 10 + c - 'A';
 148 }
 149
 150
 151 static void httpread_timeout_handler(void *eloop_data, void *user_ctx);
 152
 153 /* httpread_destroy -- if h is non-NULL, clean up
 154  * This must eventually be called by the application following
 155  * call of the application's callback and may be called
 156  * earlier if desired.
 157  */
 158 void httpread_destroy(struct httpread *h)
 159 {
 160         if (httpread_debug >= 10)
 161                 wpa_printf(MSG_DEBUG, "ENTER httpread_destroy(%p)", h);
 162         if (!h)
 163                 return;
 164
 165         if (h->to_registered)
 166                 eloop_cancel_timeout(httpread_timeout_handler, NULL, h);
 167         h->to_registered = 0;
 168         if (h->sd_registered)
 169                 eloop_unregister_sock(h->sd, EVENT_TYPE_READ);
 170         h->sd_registered = 0;
 171         os_free(h->body);
 172         os_free(h->uri);
 173         os_memset(h, 0, sizeof(*h));  /* aid debugging */
 174         h->sd = -1;     /* aid debugging */
 175         os_free(h);
 176 }
 177
 178
 179 /* httpread_timeout_handler -- called on excessive total duration
 180  */
 181 static void httpread_timeout_handler(void *eloop_data, void *user_ctx)
 182 {
 183         struct httpread *h = user_ctx;
 184         wpa_printf(MSG_DEBUG, "httpread timeout (%p)", h);
 185         h->to_registered = 0;   /* is self-cancelling */
 186         (*h->cb)(h, h->cookie, HTTPREAD_EVENT_TIMEOUT);
 187 }
 188
 189
 190 /* Analyze options only so far as is needed to correctly obtain the file.
 191  * The application can look at the raw header to find other options.
 192  */
 193 static int httpread_hdr_option_analyze(
 194         struct httpread *h,
 195         char *hbp       /* pointer to current line in header buffer */
 196         )
 197 {
 198         if (word_eq(hbp, "CONTENT-LENGTH:")) {
 199                 while (isgraph(*hbp))
 200                         hbp++;
 201                 while (*hbp == ' ' || *hbp == '\t')
 202                         hbp++;
 203                 if (!isdigit(*hbp))
 204                         return -1;
 205                 h->content_length = atol(hbp);
 206                 h->got_content_length = 1;
 207                 return 0;
 208         }
 209         if (word_eq(hbp, "TRANSFER_ENCODING:") ||
 210             word_eq(hbp, "TRANSFER-ENCODING:")) {
 211                 while (isgraph(*hbp))
 212                         hbp++;
 213                 while (*hbp == ' ' || *hbp == '\t')
 214                         hbp++;
 215                 /* There should (?) be no encodings of interest
 216                  * other than chunked...
 217                  */
 218                 if (word_eq(hbp, "CHUNKED")) {
 219                         h->chunked = 1;
 220                         h->in_chunk_data = 0;
 221                         /* ignore possible ;<parameters> */
 222                 }
 223                 return 0;
 224         }
 225         /* skip anything we don't know, which is a lot */
 226         return 0;
 227 }
 228
 229
 230 static int httpread_hdr_analyze(struct httpread *h)
 231 {
 232         char *hbp = h->hdr;      /* pointer into h->hdr */
 233         int standard_first_line = 1;
 234
 235         /* First line is special */
 236         h->hdr_type = HTTPREAD_HDR_TYPE_UNKNOWN;
 237         if (!isgraph(*hbp))
 238                 goto bad;
 239         if (os_strncmp(hbp, "HTTP/", 5) == 0) {
 240                 h->hdr_type = HTTPREAD_HDR_TYPE_REPLY;
 241                 standard_first_line = 0;
 242                 hbp += 5;
 243                 if (hbp[0] == '1' && hbp[1] == '.' &&
 244                     isdigit(hbp[2]) && hbp[2] != '0')
 245                         h->version = 1;
 246                 while (isgraph(*hbp))
 247                         hbp++;
 248                 while (*hbp == ' ' || *hbp == '\t')
 249                         hbp++;
 250                 if (!isdigit(*hbp))
 251                         goto bad;
 252                 h->reply_code = atol(hbp);
 253         } else if (word_eq(hbp, "GET"))
 254                 h->hdr_type = HTTPREAD_HDR_TYPE_GET;
 255         else if (word_eq(hbp, "HEAD"))
 256                 h->hdr_type = HTTPREAD_HDR_TYPE_HEAD;
 257         else if (word_eq(hbp, "POST"))
 258                 h->hdr_type = HTTPREAD_HDR_TYPE_POST;
 259         else if (word_eq(hbp, "PUT"))
 260                 h->hdr_type = HTTPREAD_HDR_TYPE_PUT;
 261         else if (word_eq(hbp, "DELETE"))
 262                 h->hdr_type = HTTPREAD_HDR_TYPE_DELETE;
 263         else if (word_eq(hbp, "TRACE"))
 264                 h->hdr_type = HTTPREAD_HDR_TYPE_TRACE;
 265         else if (word_eq(hbp, "CONNECT"))
 266                 h->hdr_type = HTTPREAD_HDR_TYPE_CONNECT;
 267         else if (word_eq(hbp, "NOTIFY"))
 268                 h->hdr_type = HTTPREAD_HDR_TYPE_NOTIFY;
 269         else if (word_eq(hbp, "M-SEARCH"))
 270                 h->hdr_type = HTTPREAD_HDR_TYPE_M_SEARCH;
 271         else if (word_eq(hbp, "M-POST"))
 272                 h->hdr_type = HTTPREAD_HDR_TYPE_M_POST;
 273         else if (word_eq(hbp, "SUBSCRIBE"))
 274                 h->hdr_type = HTTPREAD_HDR_TYPE_SUBSCRIBE;
 275         else if (word_eq(hbp, "UNSUBSCRIBE"))
 276                 h->hdr_type = HTTPREAD_HDR_TYPE_UNSUBSCRIBE;
 277         else {
 278         }
 279
 280         if (standard_first_line) {
 281                 char *rawuri;
 282                 char *uri;
 283                 /* skip type */
 284                 while (isgraph(*hbp))
 285                         hbp++;
 286                 while (*hbp == ' ' || *hbp == '\t')
 287                         hbp++;
 288                 /* parse uri.
 289                  * Find length, allocate memory for translated
 290                  * copy, then translate by changing %<hex><hex>
 291                  * into represented value.
 292                  */
 293                 rawuri = hbp;
 294                 while (isgraph(*hbp))
 295                         hbp++;
 296                 h->uri = os_malloc((hbp - rawuri) + 1);
 297                 if (h->uri == NULL)
 298                         goto bad;
 299                 uri = h->uri;
 300                 while (rawuri < hbp) {
 301                         int c = *rawuri;
 302                         if (c == '%' &&
 303                             isxdigit(rawuri[1]) && isxdigit(rawuri[2])) {
 304                                 *uri++ = (hex_value(rawuri[1]) << 4) |
 305                                         hex_value(rawuri[2]);
 306                                 rawuri += 3;
 307                         } else {
 308                                 *uri++ = c;
 309                                 rawuri++;
 310                         }
 311                 }
 312                 *uri = 0;       /* null terminate */
 313                 while (isgraph(*hbp))
 314                         hbp++;
 315                 while (*hbp == ' ' || *hbp == '\t')
 316                         hbp++;
 317                 /* get version */
 318                 if (0 == strncmp(hbp, "HTTP/", 5)) {
 319                         hbp += 5;
 320                         if (hbp[0] == '1' && hbp[1] == '.' &&
 321                             isdigit(hbp[2]) && hbp[2] != '0')
 322                                 h->version = 1;
 323                 }
 324         }
 325         /* skip rest of line */
 326         while (*hbp)
 327                 if (*hbp++ == '\n')
 328                         break;
 329
 330         /* Remainder of lines are options, in any order;
 331          * or empty line to terminate
 332          */
 333         for (;;) {
 334                 /* Empty line to terminate */
 335                 if (hbp[0] == '\n' ||
 336                     (hbp[0] == '\r' && hbp[1] == '\n'))
 337                         break;
 338                 if (!isgraph(*hbp))
 339                         goto bad;
 340                 if (httpread_hdr_option_analyze(h, hbp))
 341                         goto bad;
 342                 /* skip line */
 343                 while (*hbp)
 344                         if (*hbp++ == '\n')
 345                                 break;
 346         }
 347
 348         /* chunked overrides content-length always */
 349         if (h->chunked)
 350                 h->got_content_length = 0;
 351
 352         /* For some types, we should not try to read a body
 353          * This is in addition to the application determining
 354          * that we should not read a body.
 355          */
 356         switch (h->hdr_type) {
 357         case HTTPREAD_HDR_TYPE_REPLY:
 358                 /* Some codes can have a body and some not.
 359                  * For now, just assume that any other than 200
 360                  * do not...
 361                  */
 362                 if (h->reply_code != 200)
 363                         h->max_bytes = 0;
 364                 break;
 365         case HTTPREAD_HDR_TYPE_GET:
 366         case HTTPREAD_HDR_TYPE_HEAD:
 367                 /* in practice it appears that it is assumed
 368                  * that GETs have a body length of 0... ?
 369                  */
 370                 if (h->chunked == 0 && h->got_content_length == 0)
 371                         h->max_bytes = 0;
 372                 break;
 373         case HTTPREAD_HDR_TYPE_POST:
 374         case HTTPREAD_HDR_TYPE_PUT:
 375         case HTTPREAD_HDR_TYPE_DELETE:
 376         case HTTPREAD_HDR_TYPE_TRACE:
 377         case HTTPREAD_HDR_TYPE_CONNECT:
 378         case HTTPREAD_HDR_TYPE_NOTIFY:
 379         case HTTPREAD_HDR_TYPE_M_SEARCH:
 380         case HTTPREAD_HDR_TYPE_M_POST:
 381         case HTTPREAD_HDR_TYPE_SUBSCRIBE:
 382         case HTTPREAD_HDR_TYPE_UNSUBSCRIBE:
 383         default:
 384                 break;
 385         }
 386
 387         return 0;
 388
 389 bad:
 390         /* Error */
 391         return -1;
 392 }
 393
 394
 395 /* httpread_read_handler -- called when socket ready to read
 396  *
 397  * Note: any extra data we read past end of transmitted file is ignored;
 398  * if we were to support keeping connections open for multiple files then
 399  * this would have to be addressed.
 400  */
 401 static void httpread_read_handler(int sd, void *eloop_ctx, void *sock_ctx)
 402 {
 403         struct httpread *h = sock_ctx;
 404         int nread;
 405         char *rbp;      /* pointer into read buffer */
 406         char *hbp;      /* pointer into header buffer */
 407         char *bbp;      /* pointer into body buffer */
 408         char readbuf[HTTPREAD_READBUF_SIZE];  /* temp use to read into */
 409
 410         if (httpread_debug >= 20)
 411                 wpa_printf(MSG_DEBUG, "ENTER httpread_read_handler(%p)", h);
 412
 413         /* read some at a time, then search for the interal
 414          * boundaries between header and data and etc.
 415          */
 416         nread = read(h->sd, readbuf, sizeof(readbuf));
 417         if (nread < 0)
 418                 goto bad;
 419         if (nread == 0) {
 420                 /* end of transmission... this may be normal
 421                  * or may be an error... in some cases we can't
 422                  * tell which so we must assume it is normal then.
 423                  */
 424                 if (!h->got_hdr) {
 425                         /* Must at least have completed header */
 426                         wpa_printf(MSG_DEBUG, "httpread premature eof(%p)", h);
 427                         goto bad;
 428                 }
 429                 if (h->chunked || h->got_content_length) {
 430                         /* Premature EOF; e.g. dropped connection */
 431                         wpa_printf(MSG_DEBUG,
 432                                    "httpread premature eof(%p) %d/%d",
 433                                    h, h->body_nbytes,
 434                                    h->content_length);
 435                         goto bad;
 436                 }
 437                 /* No explicit length, hopefully we have all the data
 438                  * although dropped connections can cause false
 439                  * end
 440                  */
 441                 if (httpread_debug >= 10)
 442                         wpa_printf(MSG_DEBUG, "httpread ok eof(%p)", h);
 443                         h->got_body = 1;
 444                         goto got_file;
 445         }
 446         rbp = readbuf;
 447
 448         /* Header consists of text lines (terminated by both CR and LF)
 449          * and an empty line (CR LF only).
 450          */
 451         if (!h->got_hdr) {
 452                 hbp = h->hdr + h->hdr_nbytes;
 453                 /* add to headers until:
 454                  *      -- we run out of data in read buffer
 455                  *      -- or, we run out of header buffer room
 456                  *      -- or, we get double CRLF in headers
 457                  */
 458                 for (;;) {
 459                         if (nread == 0)
 460                                 goto get_more;
 461                         if (h->hdr_nbytes == HTTPREAD_HEADER_MAX_SIZE) {
 462                                 goto bad;
 463                         }
 464                         *hbp++ = *rbp++;
 465                         nread--;
 466                         h->hdr_nbytes++;
 467                         if (h->hdr_nbytes >= 4 &&
 468                             hbp[-1] == '\n' &&
 469                             hbp[-2] == '\r' &&
 470                             hbp[-3] == '\n' &&
 471                             hbp[-4] == '\r' ) {
 472                                 h->got_hdr = 1;
 473                                 *hbp = 0;       /* null terminate */
 474                                 break;
 475                         }
 476                 }
 477                 /* here we've just finished reading the header */
 478                 if (httpread_hdr_analyze(h)) {
 479                         wpa_printf(MSG_DEBUG, "httpread bad hdr(%p)", h);
 480                         goto bad;
 481                 }
 482                 if (h->max_bytes == 0) {
 483                         if (httpread_debug >= 10)
 484                                 wpa_printf(MSG_DEBUG,
 485                                            "httpread no body hdr end(%p)", h);
 486                         goto got_file;
 487                 }
 488                 if (h->got_content_length && h->content_length == 0) {
 489                         if (httpread_debug >= 10)
 490                                 wpa_printf(MSG_DEBUG,
 491                                            "httpread zero content length(%p)",
 492                                            h);
 493                         goto got_file;
 494                 }
 495         }
 496
 497         /* Certain types of requests never have data and so
 498          * must be specially recognized.
 499          */
 500         if (!os_strncasecmp(h->hdr, "SUBSCRIBE", 9) ||
 501             !os_strncasecmp(h->hdr, "UNSUBSCRIBE", 11) ||
 502             !os_strncasecmp(h->hdr, "HEAD", 4) ||
 503             !os_strncasecmp(h->hdr, "GET", 3)) {
 504                 if (!h->got_body) {
 505                         if (httpread_debug >= 10)
 506                                 wpa_printf(MSG_DEBUG,
 507                                            "httpread NO BODY for sp. type");
 508                 }
 509                 h->got_body = 1;
 510                 goto got_file;
 511         }
 512
 513         /* Data can be just plain binary data, or if "chunked"
 514          * consists of chunks each with a header, ending with
 515          * an ending header.
 516          */
 517         if (nread == 0)
 518                 goto get_more;
 519         if (!h->got_body) {
 520                 /* Here to get (more of) body */
 521                 /* ensure we have enough room for worst case for body
 522                  * plus a null termination character
 523                  */
 524                 if (h->body_alloc_nbytes < (h->body_nbytes + nread + 1)) {
 525                         char *new_body;
 526                         int new_alloc_nbytes;
 527
 528                         if (h->body_nbytes >= h->max_bytes)
 529                                 goto bad;
 530                         new_alloc_nbytes = h->body_alloc_nbytes +
 531                                 HTTPREAD_BODYBUF_DELTA;
 532                         /* For content-length case, the first time
 533                          * through we allocate the whole amount
 534                          * we need.
 535                          */
 536                         if (h->got_content_length &&
 537                             new_alloc_nbytes < (h->content_length + 1))
 538                                 new_alloc_nbytes = h->content_length + 1;
 539                         if ((new_body = os_realloc(h->body, new_alloc_nbytes))
 540                             == NULL)
 541                                 goto bad;
 542
 543                         h->body = new_body;
 544                         h->body_alloc_nbytes = new_alloc_nbytes;
 545                 }
 546                 /* add bytes */
 547                 bbp = h->body + h->body_nbytes;
 548                 for (;;) {
 549                         int ncopy;
 550                         /* See if we need to stop */
 551                         if (h->chunked && h->in_chunk_data == 0) {
 552                                 /* in chunk header */
 553                                 char *cbp = h->body + h->chunk_start;
 554                                 if (bbp-cbp >= 2 && bbp[-2] == '\r' &&
 555                                     bbp[-1] == '\n') {
 556                                         /* end of chunk hdr line */
 557                                         /* hdr line consists solely
 558                                          * of a hex numeral and CFLF
 559                                          */
 560                                         if (!isxdigit(*cbp))
 561                                                 goto bad;
 562                                         h->chunk_size = strtoul(cbp, NULL, 16);
 563                                         /* throw away chunk header
 564                                          * so we have only real data
 565                                          */
 566                                         h->body_nbytes = h->chunk_start;
 567                                         bbp = cbp;
 568                                         if (h->chunk_size == 0) {
 569                                                 /* end of chunking */
 570                                                 /* trailer follows */
 571                                                 h->in_trailer = 1;
 572                                                 if (httpread_debug >= 20)
 573                                                         wpa_printf(
 574                                                                 MSG_DEBUG,
 575                                                                 "httpread end chunks(%p)", h);
 576                                                 break;
 577                                         }
 578                                         h->in_chunk_data = 1;
 579                                         /* leave chunk_start alone */
 580                                 }
 581                         } else if (h->chunked) {
 582                                 /* in chunk data */
 583                                 if ((h->body_nbytes - h->chunk_start) ==
 584                                     (h->chunk_size + 2)) {
 585                                         /* end of chunk reached,
 586                                          * new chunk starts
 587                                          */
 588                                         /* check chunk ended w/ CRLF
 589                                          * which we'll throw away
 590                                          */
 591                                         if (bbp[-1] == '\n' &&
 592                                             bbp[-2] == '\r') {
 593                                         } else
 594                                                 goto bad;
 595                                         h->body_nbytes -= 2;
 596                                         bbp -= 2;
 597                                         h->chunk_start = h->body_nbytes;
 598                                         h->in_chunk_data = 0;
 599                                         h->chunk_size = 0; /* just in case */
 600                                 }
 601                         } else if (h->got_content_length &&
 602                                    h->body_nbytes >= h->content_length) {
 603                                 h->got_body = 1;
 604                                 if (httpread_debug >= 10)
 605                                         wpa_printf(
 606                                                 MSG_DEBUG,
 607                                                 "httpread got content(%p)", h);
 608                                 goto got_file;
 609                         }
 610                         if (nread <= 0)
 611                                 break;
 612                         /* Now transfer. Optimize using memcpy where we can. */
 613                         if (h->chunked && h->in_chunk_data) {
 614                                 /* copy up to remainder of chunk data
 615                                  * plus the required CR+LF at end
 616                                  */
 617                                 ncopy = (h->chunk_start + h->chunk_size + 2) -
 618                                         h->body_nbytes;
 619                         } else if (h->chunked) {
 620                                 /*in chunk header -- don't optimize */
 621                                 *bbp++ = *rbp++;
 622                                 nread--;
 623                                 h->body_nbytes++;
 624                                 continue;
 625                         } else if (h->got_content_length) {
 626                                 ncopy = h->content_length - h->body_nbytes;
 627                         } else {
 628                                 ncopy = nread;
 629                         }
 630                         /* Note: should never be 0 */
 631                         if (ncopy > nread)
 632                                 ncopy = nread;
 633                         os_memcpy(bbp, rbp, ncopy);
 634                         bbp += ncopy;
 635                         h->body_nbytes += ncopy;
 636                         rbp += ncopy;
 637                         nread -= ncopy;
 638                 }       /* body copy loop */
 639         }       /* !got_body */
 640         if (h->chunked && h->in_trailer) {
 641                 /* If "chunked" then there is always a trailer,
 642                  * consisting of zero or more non-empty lines
 643                  * ending with CR LF and then an empty line w/ CR LF.
 644                  * We do NOT support trailers except to skip them --
 645                  * this is supported (generally) by the http spec.
 646                  */
 647                 bbp = h->body + h->body_nbytes;
 648                 for (;;) {
 649                         int c;
 650                         if (nread <= 0)
 651                                 break;
 652                         c = *rbp++;
 653                         nread--;
 654                         switch (h->trailer_state) {
 655                         case trailer_line_begin:
 656                                 if (c == '\r')
 657                                         h->trailer_state = trailer_empty_cr;
 658                                 else
 659                                         h->trailer_state = trailer_nonempty;
 660                                 break;
 661                         case trailer_empty_cr:
 662                                 /* end empty line */
 663                                 if (c == '\n') {
 664                                         h->trailer_state = trailer_line_begin;
 665                                         h->in_trailer = 0;
 666                                         if (httpread_debug >= 10)
 667                                                 wpa_printf(
 668                                                         MSG_DEBUG,
 669                                                         "httpread got content(%p)", h);
 670                                         h->got_body = 1;
 671                                         goto got_file;
 672                                 }
 673                                 h->trailer_state = trailer_nonempty;
 674                                 break;
 675                         case trailer_nonempty:
 676                                 if (c == '\r')
 677                                         h->trailer_state = trailer_nonempty_cr;
 678                                 break;
 679                         case trailer_nonempty_cr:
 680                                 if (c == '\n')
 681                                         h->trailer_state = trailer_line_begin;
 682                                 else
 683                                         h->trailer_state = trailer_nonempty;
 684                                 break;
 685                         }
 686                 }
 687         }
 688         goto get_more;
 689
 690 bad:
 691         /* Error */
 692         wpa_printf(MSG_DEBUG, "httpread read/parse failure (%p)", h);
 693         (*h->cb)(h, h->cookie, HTTPREAD_EVENT_ERROR);
 694         return;
 695
 696 get_more:
 697         return;
 698
 699 got_file:
 700         if (httpread_debug >= 10)
 701                 wpa_printf(MSG_DEBUG,
 702                            "httpread got file %d bytes type %d",
 703                            h->body_nbytes, h->hdr_type);
 704         /* Null terminate for convenience of some applications */
 705         if (h->body)
 706                 h->body[h->body_nbytes] = 0; /* null terminate */
 707         h->got_file = 1;
 708         /* Assume that we do NOT support keeping connection alive,
 709          * and just in case somehow we don't get destroyed right away,
 710          * unregister now.
 711          */
 712         if (h->sd_registered)
 713                 eloop_unregister_sock(h->sd, EVENT_TYPE_READ);
 714         h->sd_registered = 0;
 715         /* The application can destroy us whenever they feel like...
 716          * cancel timeout.
 717          */
 718         if (h->to_registered)
 719                 eloop_cancel_timeout(httpread_timeout_handler, NULL, h);
 720         h->to_registered = 0;
 721         (*h->cb)(h, h->cookie, HTTPREAD_EVENT_FILE_READY);
 722 }
 723
 724
 725 /* httpread_create -- start a new reading session making use of eloop.
 726  * The new instance will use the socket descriptor for reading (until
 727  * it gets a file and not after) but will not close the socket, even
 728  * when the instance is destroyed (the application must do that).
 729  * Return NULL on error.
 730  *
 731  * Provided that httpread_create successfully returns a handle,
 732  * the callback fnc is called to handle httpread_event events.
 733  * The caller should do destroy on any errors or unknown events.
 734  *
 735  * Pass max_bytes == 0 to not read body at all (required for e.g.
 736  * reply to HEAD request).
 737  */
 738 struct httpread * httpread_create(
 739         int sd,  /* descriptor of TCP socket to read from */
 740         void (*cb)(struct httpread *handle, void *cookie,
 741                    enum httpread_event e),  /* call on event */
 742         void *cookie,    /* pass to callback */
 743         int max_bytes,    /* maximum body size else abort it */
 744         int timeout_seconds     /* 0; or total duration timeout period */
 745         )
 746 {
 747         struct httpread *h = NULL;
 748
 749         h = os_zalloc(sizeof(*h));
 750         if (h == NULL)
 751                 goto fail;
 752         h->sd = sd;
 753         h->cb = cb;
 754         h->cookie = cookie;
 755         h->max_bytes = max_bytes;
 756         h->timeout_seconds = timeout_seconds;
 757
 758         if (timeout_seconds > 0) {
 759                 if (eloop_register_timeout(timeout_seconds, 0,
 760                                            httpread_timeout_handler,
 761                                            NULL, h)) {
 762                         /* No way to recover (from malloc failure) */
 763                         goto fail;
 764                 }
 765                 h->to_registered = 1;
 766         }
 767         if (eloop_register_sock(sd, EVENT_TYPE_READ, httpread_read_handler,
 768                                 NULL, h)) {
 769                 /* No way to recover (from malloc failure) */
 770                 goto fail;
 771         }
 772         h->sd_registered = 1;
 773         return h;
 774
 775 fail:
 776
 777         /* Error */
 778         httpread_destroy(h);
 779         return NULL;
 780 }
 781
 782
 783 /* httpread_hdr_type_get -- When file is ready, returns header type. */
 784 enum httpread_hdr_type httpread_hdr_type_get(struct httpread *h)
 785 {
 786         return h->hdr_type;
 787 }
 788
 789
 790 /* httpread_uri_get -- When file is ready, uri_get returns (translated) URI
 791  * or possibly NULL (which would be an error).
 792  */
 793 char * httpread_uri_get(struct httpread *h)
 794 {
 795         return h->uri;
 796 }
 797
 798
 799 /* httpread_reply_code_get -- When reply is ready, returns reply code */
 800 int httpread_reply_code_get(struct httpread *h)
 801 {
 802         return h->reply_code;
 803 }
 804
 805
 806 /* httpread_length_get -- When file is ready, returns file length. */
 807 int httpread_length_get(struct httpread *h)
 808 {
 809         return h->body_nbytes;
 810 }
 811
 812
 813 /* httpread_data_get -- When file is ready, returns file content
 814  * with null byte appened.
 815  * Might return NULL in some error condition.
 816  */
 817 void * httpread_data_get(struct httpread *h)
 818 {
 819         return h->body ? h->body : "";
 820 }
 821
 822
 823 /* httpread_hdr_get -- When file is ready, returns header content
 824  * with null byte appended.
 825  * Might return NULL in some error condition.
 826  */
 827 char * httpread_hdr_get(struct httpread *h)
 828 {
 829         return h->hdr;
 830 }
 831
 832
 833 /* httpread_hdr_line_get -- When file is ready, returns pointer
 834  * to line within header content matching the given tag
 835  * (after the tag itself and any spaces/tabs).
 836  *
 837  * The tag should end with a colon for reliable matching.
 838  *
 839  * If not found, returns NULL;
 840  */
 841 char * httpread_hdr_line_get(struct httpread *h, const char *tag)
 842 {
 843         int tag_len = os_strlen(tag);
 844         char *hdr = h->hdr;
 845         hdr = os_strchr(hdr, '\n');
 846         if (hdr == NULL)
 847                 return NULL;
 848         hdr++;
 849         for (;;) {
 850                 if (!os_strncasecmp(hdr, tag, tag_len)) {
 851                         hdr += tag_len;
 852                         while (*hdr == ' ' || *hdr == '\t')
 853                                 hdr++;
 854                         return hdr;
 855                 }
 856                 hdr = os_strchr(hdr, '\n');
 857                 if (hdr == NULL)
 858                         return NULL;
 859                 hdr++;
 860         }
 861 }