third_party/libxml/src/nanohttp.c

   1 /*
   2  * nanohttp.c: minimalist HTTP GET implementation to fetch external subsets.
   3  *             focuses on size, streamability, reentrancy and portability
   4  *
   5  * This is clearly not a general purpose HTTP implementation
   6  * If you look for one, check:
   7  *         http://www.w3.org/Library/
   8  *
   9  * See Copyright for the status of this software.
  10  *
  11  * daniel@veillard.com
  12  */
  13
  14 #define NEED_SOCKETS
  15 #define IN_LIBXML
  16 #include "libxml.h"
  17
  18 #ifdef LIBXML_HTTP_ENABLED
  19 #include <string.h>
  20
  21 #ifdef HAVE_STDLIB_H
  22 #include <stdlib.h>
  23 #endif
  24 #ifdef HAVE_UNISTD_H
  25 #include <unistd.h>
  26 #endif
  27 #ifdef HAVE_SYS_TYPES_H
  28 #include <sys/types.h>
  29 #endif
  30 #ifdef HAVE_SYS_SOCKET_H
  31 #include <sys/socket.h>
  32 #endif
  33 #ifdef HAVE_NETINET_IN_H
  34 #include <netinet/in.h>
  35 #endif
  36 #ifdef HAVE_ARPA_INET_H
  37 #include <arpa/inet.h>
  38 #endif
  39 #ifdef HAVE_NETDB_H
  40 #include <netdb.h>
  41 #endif
  42 #ifdef HAVE_RESOLV_H
  43 #ifdef HAVE_ARPA_NAMESER_H
  44 #include <arpa/nameser.h>
  45 #endif
  46 #include <resolv.h>
  47 #endif
  48 #ifdef HAVE_FCNTL_H
  49 #include <fcntl.h>
  50 #endif
  51 #ifdef HAVE_ERRNO_H
  52 #include <errno.h>
  53 #endif
  54 #ifdef HAVE_SYS_TIME_H
  55 #include <sys/time.h>
  56 #endif
  57 #ifndef HAVE_POLL_H
  58 #ifdef HAVE_SYS_SELECT_H
  59 #include <sys/select.h>
  60 #endif
  61 #else
  62 #include <poll.h>
  63 #endif
  64 #ifdef HAVE_STRINGS_H
  65 #include <strings.h>
  66 #endif
  67 #ifdef HAVE_ZLIB_H
  68 #include <zlib.h>
  69 #endif
  70
  71
  72 #ifdef VMS
  73 #include <stropts>
  74 #define XML_SOCKLEN_T unsigned int
  75 #endif
  76
  77 #if defined(__MINGW32__) || defined(_WIN32_WCE)
  78 #ifndef _WINSOCKAPI_
  79 #define _WINSOCKAPI_
  80 #endif
  81 #include <wsockcompat.h>
  82 #include <winsock2.h>
  83 #undef XML_SOCKLEN_T
  84 #define XML_SOCKLEN_T unsigned int
  85 #endif
  86
  87 #include <libxml/globals.h>
  88 #include <libxml/xmlerror.h>
  89 #include <libxml/xmlmemory.h>
  90 #include <libxml/parser.h> /* for xmlStr(n)casecmp() */
  91 #include <libxml/nanohttp.h>
  92 #include <libxml/globals.h>
  93 #include <libxml/uri.h>
  94
  95 /**
  96  * A couple portability macros
  97  */
  98 #ifndef _WINSOCKAPI_
  99 #if !defined(__BEOS__) || defined(__HAIKU__)
 100 #define closesocket(s) close(s)
 101 #endif
 102 #define SOCKET int
 103 #define INVALID_SOCKET (-1)
 104 #endif
 105
 106 #ifdef __BEOS__
 107 #ifndef PF_INET
 108 #define PF_INET AF_INET
 109 #endif
 110 #endif
 111
 112 #ifndef XML_SOCKLEN_T
 113 #define XML_SOCKLEN_T unsigned int
 114 #endif
 115
 116 #ifdef STANDALONE
 117 #define DEBUG_HTTP
 118 #define xmlStrncasecmp(a, b, n) strncasecmp((char *)a, (char *)b, n)
 119 #define xmlStrcasecmpi(a, b) strcasecmp((char *)a, (char *)b)
 120 #endif
 121
 122 #define XML_NANO_HTTP_MAX_REDIR 10
 123
 124 #define XML_NANO_HTTP_CHUNK     4096
 125
 126 #define XML_NANO_HTTP_CLOSED    0
 127 #define XML_NANO_HTTP_WRITE     1
 128 #define XML_NANO_HTTP_READ      2
 129 #define XML_NANO_HTTP_NONE      4
 130
 131 typedef struct xmlNanoHTTPCtxt {
 132     char *protocol;     /* the protocol name */
 133     char *hostname;     /* the host name */
 134     int port;           /* the port */
 135     char *path;         /* the path within the URL */
 136     char *query;        /* the query string */
 137     SOCKET fd;          /* the file descriptor for the socket */
 138     int state;          /* WRITE / READ / CLOSED */
 139     char *out;          /* buffer sent (zero terminated) */
 140     char *outptr;       /* index within the buffer sent */
 141     char *in;           /* the receiving buffer */
 142     char *content;      /* the start of the content */
 143     char *inptr;        /* the next byte to read from network */
 144     char *inrptr;       /* the next byte to give back to the client */
 145     int inlen;          /* len of the input buffer */
 146     int last;           /* return code for last operation */
 147     int returnValue;    /* the protocol return value */
 148     int version;        /* the protocol version */
 149     int ContentLength;  /* specified content length from HTTP header */
 150     char *contentType;  /* the MIME type for the input */
 151     char *location;     /* the new URL in case of redirect */
 152     char *authHeader;   /* contents of {WWW,Proxy}-Authenticate header */
 153     char *encoding;     /* encoding extracted from the contentType */
 154     char *mimeType;     /* Mime-Type extracted from the contentType */
 155 #ifdef HAVE_ZLIB_H
 156     z_stream *strm;     /* Zlib stream object */
 157     int usesGzip;       /* "Content-Encoding: gzip" was detected */
 158 #endif
 159 } xmlNanoHTTPCtxt, *xmlNanoHTTPCtxtPtr;
 160
 161 static int initialized = 0;
 162 static char *proxy = NULL;       /* the proxy name if any */
 163 static int proxyPort;   /* the proxy port if any */
 164 static unsigned int timeout = 60;/* the select() timeout in seconds */
 165
 166 static int xmlNanoHTTPFetchContent( void * ctx, char ** ptr, int * len );
 167
 168 /**
 169  * xmlHTTPErrMemory:
 170  * @extra:  extra informations
 171  *
 172  * Handle an out of memory condition
 173  */
 174 static void
 175 xmlHTTPErrMemory(const char *extra)
 176 {
 177     __xmlSimpleError(XML_FROM_HTTP, XML_ERR_NO_MEMORY, NULL, NULL, extra);
 178 }
 179
 180 /**
 181  * A portability function
 182  */
 183 static int socket_errno(void) {
 184 #ifdef _WINSOCKAPI_
 185     return(WSAGetLastError());
 186 #else
 187     return(errno);
 188 #endif
 189 }
 190
 191 #ifdef SUPPORT_IP6
 192 static
 193 int have_ipv6(void) {
 194     SOCKET s;
 195
 196     s = socket (AF_INET6, SOCK_STREAM, 0);
 197     if (s != INVALID_SOCKET) {
 198         close (s);
 199         return (1);
 200     }
 201     return (0);
 202 }
 203 #endif
 204
 205 /**
 206  * xmlNanoHTTPInit:
 207  *
 208  * Initialize the HTTP protocol layer.
 209  * Currently it just checks for proxy informations
 210  */
 211
 212 void
 213 xmlNanoHTTPInit(void) {
 214     const char *env;
 215 #ifdef _WINSOCKAPI_
 216     WSADATA wsaData;
 217 #endif
 218
 219     if (initialized)
 220         return;
 221
 222 #ifdef _WINSOCKAPI_
 223     if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0)
 224         return;
 225 #endif
 226
 227     if (proxy == NULL) {
 228         proxyPort = 80;
 229         env = getenv("no_proxy");
 230         if (env && ((env[0] == '*') && (env[1] == 0)))
 231             goto done;
 232         env = getenv("http_proxy");
 233         if (env != NULL) {
 234             xmlNanoHTTPScanProxy(env);
 235             goto done;
 236         }
 237         env = getenv("HTTP_PROXY");
 238         if (env != NULL) {
 239             xmlNanoHTTPScanProxy(env);
 240             goto done;
 241         }
 242     }
 243 done:
 244     initialized = 1;
 245 }
 246
 247 /**
 248  * xmlNanoHTTPCleanup:
 249  *
 250  * Cleanup the HTTP protocol layer.
 251  */
 252
 253 void
 254 xmlNanoHTTPCleanup(void) {
 255     if (proxy != NULL) {
 256         xmlFree(proxy);
 257         proxy = NULL;
 258     }
 259 #ifdef _WINSOCKAPI_
 260     if (initialized)
 261         WSACleanup();
 262 #endif
 263     initialized = 0;
 264     return;
 265 }
 266
 267 /**
 268  * xmlNanoHTTPScanURL:
 269  * @ctxt:  an HTTP context
 270  * @URL:  The URL used to initialize the context
 271  *
 272  * (Re)Initialize an HTTP context by parsing the URL and finding
 273  * the protocol host port and path it indicates.
 274  */
 275
 276 static void
 277 xmlNanoHTTPScanURL(xmlNanoHTTPCtxtPtr ctxt, const char *URL) {
 278     xmlURIPtr uri;
 279     int len;
 280
 281     /*
 282      * Clear any existing data from the context
 283      */
 284     if (ctxt->protocol != NULL) {
 285         xmlFree(ctxt->protocol);
 286         ctxt->protocol = NULL;
 287     }
 288     if (ctxt->hostname != NULL) {
 289         xmlFree(ctxt->hostname);
 290         ctxt->hostname = NULL;
 291     }
 292     if (ctxt->path != NULL) {
 293         xmlFree(ctxt->path);
 294         ctxt->path = NULL;
 295     }
 296     if (ctxt->query != NULL) {
 297         xmlFree(ctxt->query);
 298         ctxt->query = NULL;
 299     }
 300     if (URL == NULL) return;
 301
 302     uri = xmlParseURIRaw(URL, 1);
 303     if (uri == NULL)
 304         return;
 305
 306     if ((uri->scheme == NULL) || (uri->server == NULL)) {
 307         xmlFreeURI(uri);
 308         return;
 309     }
 310
 311     ctxt->protocol = xmlMemStrdup(uri->scheme);
 312     /* special case of IPv6 addresses, the [] need to be removed */
 313     if ((uri->server != NULL) && (*uri->server == '[')) {
 314         len = strlen(uri->server);
 315         if ((len > 2) && (uri->server[len - 1] == ']')) {
 316             ctxt->hostname = (char *) xmlCharStrndup(uri->server + 1, len -2);
 317         } else
 318             ctxt->hostname = xmlMemStrdup(uri->server);
 319     } else
 320         ctxt->hostname = xmlMemStrdup(uri->server);
 321     if (uri->path != NULL)
 322         ctxt->path = xmlMemStrdup(uri->path);
 323     else
 324         ctxt->path = xmlMemStrdup("/");
 325     if (uri->query != NULL)
 326         ctxt->query = xmlMemStrdup(uri->query);
 327     if (uri->port != 0)
 328         ctxt->port = uri->port;
 329
 330     xmlFreeURI(uri);
 331 }
 332
 333 /**
 334  * xmlNanoHTTPScanProxy:
 335  * @URL:  The proxy URL used to initialize the proxy context
 336  *
 337  * (Re)Initialize the HTTP Proxy context by parsing the URL and finding
 338  * the protocol host port it indicates.
 339  * Should be like http://myproxy/ or http://myproxy:3128/
 340  * A NULL URL cleans up proxy informations.
 341  */
 342
 343 void
 344 xmlNanoHTTPScanProxy(const char *URL) {
 345     xmlURIPtr uri;
 346
 347     if (proxy != NULL) {
 348         xmlFree(proxy);
 349         proxy = NULL;
 350     }
 351     proxyPort = 0;
 352
 353 #ifdef DEBUG_HTTP
 354     if (URL == NULL)
 355         xmlGenericError(xmlGenericErrorContext,
 356                 "Removing HTTP proxy info\n");
 357     else
 358         xmlGenericError(xmlGenericErrorContext,
 359                 "Using HTTP proxy %s\n", URL);
 360 #endif
 361     if (URL == NULL) return;
 362
 363     uri = xmlParseURIRaw(URL, 1);
 364     if ((uri == NULL) || (uri->scheme == NULL) ||
 365         (strcmp(uri->scheme, "http")) || (uri->server == NULL)) {
 366         __xmlIOErr(XML_FROM_HTTP, XML_HTTP_URL_SYNTAX, "Syntax Error\n");
 367         if (uri != NULL)
 368             xmlFreeURI(uri);
 369         return;
 370     }
 371
 372     proxy = xmlMemStrdup(uri->server);
 373     if (uri->port != 0)
 374         proxyPort = uri->port;
 375
 376     xmlFreeURI(uri);
 377 }
 378
 379 /**
 380  * xmlNanoHTTPNewCtxt:
 381  * @URL:  The URL used to initialize the context
 382  *
 383  * Allocate and initialize a new HTTP context.
 384  *
 385  * Returns an HTTP context or NULL in case of error.
 386  */
 387
 388 static xmlNanoHTTPCtxtPtr
 389 xmlNanoHTTPNewCtxt(const char *URL) {
 390     xmlNanoHTTPCtxtPtr ret;
 391
 392     ret = (xmlNanoHTTPCtxtPtr) xmlMalloc(sizeof(xmlNanoHTTPCtxt));
 393     if (ret == NULL) {
 394         xmlHTTPErrMemory("allocating context");
 395         return(NULL);
 396     }
 397
 398     memset(ret, 0, sizeof(xmlNanoHTTPCtxt));
 399     ret->port = 80;
 400     ret->returnValue = 0;
 401     ret->fd = INVALID_SOCKET;
 402     ret->ContentLength = -1;
 403
 404     xmlNanoHTTPScanURL(ret, URL);
 405
 406     return(ret);
 407 }
 408
 409 /**
 410  * xmlNanoHTTPFreeCtxt:
 411  * @ctxt:  an HTTP context
 412  *
 413  * Frees the context after closing the connection.
 414  */
 415
 416 static void
 417 xmlNanoHTTPFreeCtxt(xmlNanoHTTPCtxtPtr ctxt) {
 418     if (ctxt == NULL) return;
 419     if (ctxt->hostname != NULL) xmlFree(ctxt->hostname);
 420     if (ctxt->protocol != NULL) xmlFree(ctxt->protocol);
 421     if (ctxt->path != NULL) xmlFree(ctxt->path);
 422     if (ctxt->query != NULL) xmlFree(ctxt->query);
 423     if (ctxt->out != NULL) xmlFree(ctxt->out);
 424     if (ctxt->in != NULL) xmlFree(ctxt->in);
 425     if (ctxt->contentType != NULL) xmlFree(ctxt->contentType);
 426     if (ctxt->encoding != NULL) xmlFree(ctxt->encoding);
 427     if (ctxt->mimeType != NULL) xmlFree(ctxt->mimeType);
 428     if (ctxt->location != NULL) xmlFree(ctxt->location);
 429     if (ctxt->authHeader != NULL) xmlFree(ctxt->authHeader);
 430 #ifdef HAVE_ZLIB_H
 431     if (ctxt->strm != NULL) {
 432         inflateEnd(ctxt->strm);
 433         xmlFree(ctxt->strm);
 434     }
 435 #endif
 436
 437     ctxt->state = XML_NANO_HTTP_NONE;
 438     if (ctxt->fd != INVALID_SOCKET) closesocket(ctxt->fd);
 439     ctxt->fd = INVALID_SOCKET;
 440     xmlFree(ctxt);
 441 }
 442
 443 /**
 444  * xmlNanoHTTPSend:
 445  * @ctxt:  an HTTP context
 446  *
 447  * Send the input needed to initiate the processing on the server side
 448  * Returns number of bytes sent or -1 on error.
 449  */
 450
 451 static int
 452 xmlNanoHTTPSend(xmlNanoHTTPCtxtPtr ctxt, const char *xmt_ptr, int outlen)
 453 {
 454     int total_sent = 0;
 455 #ifdef HAVE_POLL_H
 456     struct pollfd p;
 457 #else
 458     struct timeval tv;
 459     fd_set wfd;
 460 #endif
 461
 462     if ((ctxt->state & XML_NANO_HTTP_WRITE) && (xmt_ptr != NULL)) {
 463         while (total_sent < outlen) {
 464             int nsent = send(ctxt->fd, SEND_ARG2_CAST (xmt_ptr + total_sent),
 465                              outlen - total_sent, 0);
 466
 467             if (nsent > 0)
 468                 total_sent += nsent;
 469             else if ((nsent == -1) &&
 470 #if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
 471                      (socket_errno() != EAGAIN) &&
 472 #endif
 473                      (socket_errno() != EWOULDBLOCK)) {
 474                 __xmlIOErr(XML_FROM_HTTP, 0, "send failed\n");
 475                 if (total_sent == 0)
 476                     total_sent = -1;
 477                 break;
 478             } else {
 479                 /*
 480                  * No data sent
 481                  * Since non-blocking sockets are used, wait for
 482                  * socket to be writable or default timeout prior
 483                  * to retrying.
 484                  */
 485 #ifndef HAVE_POLL_H
 486 #ifndef _WINSOCKAPI_
 487                 if (ctxt->fd > FD_SETSIZE)
 488                     return -1;
 489 #endif
 490
 491                 tv.tv_sec = timeout;
 492                 tv.tv_usec = 0;
 493                 FD_ZERO(&wfd);
 494 #ifdef _MSC_VER
 495 #pragma warning(push)
 496 #pragma warning(disable: 4018)
 497 #endif
 498                 FD_SET(ctxt->fd, &wfd);
 499 #ifdef _MSC_VER
 500 #pragma warning(pop)
 501 #endif
 502                 (void) select(ctxt->fd + 1, NULL, &wfd, NULL, &tv);
 503 #else
 504                 p.fd = ctxt->fd;
 505                 p.events = POLLOUT;
 506                 (void) poll(&p, 1, timeout * 1000);
 507 #endif /* !HAVE_POLL_H */
 508             }
 509         }
 510     }
 511
 512     return total_sent;
 513 }
 514
 515 /**
 516  * xmlNanoHTTPRecv:
 517  * @ctxt:  an HTTP context
 518  *
 519  * Read information coming from the HTTP connection.
 520  * This is a blocking call (but it blocks in select(), not read()).
 521  *
 522  * Returns the number of byte read or -1 in case of error.
 523  */
 524
 525 static int
 526 xmlNanoHTTPRecv(xmlNanoHTTPCtxtPtr ctxt)
 527 {
 528 #ifdef HAVE_POLL_H
 529     struct pollfd p;
 530 #else
 531     fd_set rfd;
 532     struct timeval tv;
 533 #endif
 534
 535
 536     while (ctxt->state & XML_NANO_HTTP_READ) {
 537         if (ctxt->in == NULL) {
 538             ctxt->in = (char *) xmlMallocAtomic(65000 * sizeof(char));
 539             if (ctxt->in == NULL) {
 540                 xmlHTTPErrMemory("allocating input");
 541                 ctxt->last = -1;
 542                 return (-1);
 543             }
 544             ctxt->inlen = 65000;
 545             ctxt->inptr = ctxt->content = ctxt->inrptr = ctxt->in;
 546         }
 547         if (ctxt->inrptr > ctxt->in + XML_NANO_HTTP_CHUNK) {
 548             int delta = ctxt->inrptr - ctxt->in;
 549             int len = ctxt->inptr - ctxt->inrptr;
 550
 551             memmove(ctxt->in, ctxt->inrptr, len);
 552             ctxt->inrptr -= delta;
 553             ctxt->content -= delta;
 554             ctxt->inptr -= delta;
 555         }
 556         if ((ctxt->in + ctxt->inlen) < (ctxt->inptr + XML_NANO_HTTP_CHUNK)) {
 557             int d_inptr = ctxt->inptr - ctxt->in;
 558             int d_content = ctxt->content - ctxt->in;
 559             int d_inrptr = ctxt->inrptr - ctxt->in;
 560             char *tmp_ptr = ctxt->in;
 561
 562             ctxt->inlen *= 2;
 563             ctxt->in = (char *) xmlRealloc(tmp_ptr, ctxt->inlen);
 564             if (ctxt->in == NULL) {
 565                 xmlHTTPErrMemory("allocating input buffer");
 566                 xmlFree(tmp_ptr);
 567                 ctxt->last = -1;
 568                 return (-1);
 569             }
 570             ctxt->inptr = ctxt->in + d_inptr;
 571             ctxt->content = ctxt->in + d_content;
 572             ctxt->inrptr = ctxt->in + d_inrptr;
 573         }
 574         ctxt->last = recv(ctxt->fd, ctxt->inptr, XML_NANO_HTTP_CHUNK, 0);
 575         if (ctxt->last > 0) {
 576             ctxt->inptr += ctxt->last;
 577             return (ctxt->last);
 578         }
 579         if (ctxt->last == 0) {
 580             return (0);
 581         }
 582         if (ctxt->last == -1) {
 583             switch (socket_errno()) {
 584                 case EINPROGRESS:
 585                 case EWOULDBLOCK:
 586 #if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
 587                 case EAGAIN:
 588 #endif
 589                     break;
 590
 591                 case ECONNRESET:
 592                 case ESHUTDOWN:
 593                     return (0);
 594
 595                 default:
 596                     __xmlIOErr(XML_FROM_HTTP, 0, "recv failed\n");
 597                     return (-1);
 598             }
 599         }
 600 #ifdef HAVE_POLL_H
 601         p.fd = ctxt->fd;
 602         p.events = POLLIN;
 603         if ((poll(&p, 1, timeout * 1000) < 1)
 604 #if defined(EINTR)
 605             && (errno != EINTR)
 606 #endif
 607             )
 608             return (0);
 609 #else /* !HAVE_POLL_H */
 610 #ifndef _WINSOCKAPI_
 611         if (ctxt->fd > FD_SETSIZE)
 612             return 0;
 613 #endif
 614
 615         tv.tv_sec = timeout;
 616         tv.tv_usec = 0;
 617         FD_ZERO(&rfd);
 618
 619 #ifdef _MSC_VER
 620 #pragma warning(push)
 621 #pragma warning(disable: 4018)
 622 #endif
 623
 624         FD_SET(ctxt->fd, &rfd);
 625
 626 #ifdef _MSC_VER
 627 #pragma warning(pop)
 628 #endif
 629
 630         if ((select(ctxt->fd + 1, &rfd, NULL, NULL, &tv) < 1)
 631 #if defined(EINTR)
 632             && (errno != EINTR)
 633 #endif
 634             )
 635             return (0);
 636 #endif /* !HAVE_POLL_H */
 637     }
 638     return (0);
 639 }
 640
 641 /**
 642  * xmlNanoHTTPReadLine:
 643  * @ctxt:  an HTTP context
 644  *
 645  * Read one line in the HTTP server output, usually for extracting
 646  * the HTTP protocol informations from the answer header.
 647  *
 648  * Returns a newly allocated string with a copy of the line, or NULL
 649  *         which indicate the end of the input.
 650  */
 651
 652 static char *
 653 xmlNanoHTTPReadLine(xmlNanoHTTPCtxtPtr ctxt) {
 654     char buf[4096];
 655     char *bp = buf;
 656     int rc;
 657
 658     while (bp - buf < 4095) {
 659         if (ctxt->inrptr == ctxt->inptr) {
 660             if ( (rc = xmlNanoHTTPRecv(ctxt)) == 0) {
 661                 if (bp == buf)
 662                     return(NULL);
 663                 else
 664                     *bp = 0;
 665                 return(xmlMemStrdup(buf));
 666             }
 667             else if ( rc == -1 ) {
 668                 return ( NULL );
 669             }
 670         }
 671         *bp = *ctxt->inrptr++;
 672         if (*bp == '\n') {
 673             *bp = 0;
 674             return(xmlMemStrdup(buf));
 675         }
 676         if (*bp != '\r')
 677             bp++;
 678     }
 679     buf[4095] = 0;
 680     return(xmlMemStrdup(buf));
 681 }
 682
 683
 684 /**
 685  * xmlNanoHTTPScanAnswer:
 686  * @ctxt:  an HTTP context
 687  * @line:  an HTTP header line
 688  *
 689  * Try to extract useful informations from the server answer.
 690  * We currently parse and process:
 691  *  - The HTTP revision/ return code
 692  *  - The Content-Type, Mime-Type and charset used
 693  *  - The Location for redirect processing.
 694  *
 695  * Returns -1 in case of failure, the file descriptor number otherwise
 696  */
 697
 698 static void
 699 xmlNanoHTTPScanAnswer(xmlNanoHTTPCtxtPtr ctxt, const char *line) {
 700     const char *cur = line;
 701
 702     if (line == NULL) return;
 703
 704     if (!strncmp(line, "HTTP/", 5)) {
 705         int version = 0;
 706         int ret = 0;
 707
 708         cur += 5;
 709         while ((*cur >= '0') && (*cur <= '9')) {
 710             version *= 10;
 711             version += *cur - '0';
 712             cur++;
 713         }
 714         if (*cur == '.') {
 715             cur++;
 716             if ((*cur >= '0') && (*cur <= '9')) {
 717                 version *= 10;
 718                 version += *cur - '0';
 719                 cur++;
 720             }
 721             while ((*cur >= '0') && (*cur <= '9'))
 722                 cur++;
 723         } else
 724             version *= 10;
 725         if ((*cur != ' ') && (*cur != '\t')) return;
 726         while ((*cur == ' ') || (*cur == '\t')) cur++;
 727         if ((*cur < '0') || (*cur > '9')) return;
 728         while ((*cur >= '0') && (*cur <= '9')) {
 729             ret *= 10;
 730             ret += *cur - '0';
 731             cur++;
 732         }
 733         if ((*cur != 0) && (*cur != ' ') && (*cur != '\t')) return;
 734         ctxt->returnValue = ret;
 735         ctxt->version = version;
 736     } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Content-Type:", 13)) {
 737         const xmlChar *charset, *last, *mime;
 738         cur += 13;
 739         while ((*cur == ' ') || (*cur == '\t')) cur++;
 740         if (ctxt->contentType != NULL)
 741             xmlFree(ctxt->contentType);
 742         ctxt->contentType = xmlMemStrdup(cur);
 743         mime = (const xmlChar *) cur;
 744         last = mime;
 745         while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
 746                (*last != ';') && (*last != ','))
 747             last++;
 748         if (ctxt->mimeType != NULL)
 749             xmlFree(ctxt->mimeType);
 750         ctxt->mimeType = (char *) xmlStrndup(mime, last - mime);
 751         charset = xmlStrstr(BAD_CAST ctxt->contentType, BAD_CAST "charset=");
 752         if (charset != NULL) {
 753             charset += 8;
 754             last = charset;
 755             while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
 756                    (*last != ';') && (*last != ','))
 757                 last++;
 758             if (ctxt->encoding != NULL)
 759                 xmlFree(ctxt->encoding);
 760             ctxt->encoding = (char *) xmlStrndup(charset, last - charset);
 761         }
 762     } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"ContentType:", 12)) {
 763         const xmlChar *charset, *last, *mime;
 764         cur += 12;
 765         if (ctxt->contentType != NULL) return;
 766         while ((*cur == ' ') || (*cur == '\t')) cur++;
 767         ctxt->contentType = xmlMemStrdup(cur);
 768         mime = (const xmlChar *) cur;
 769         last = mime;
 770         while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
 771                (*last != ';') && (*last != ','))
 772             last++;
 773         if (ctxt->mimeType != NULL)
 774             xmlFree(ctxt->mimeType);
 775         ctxt->mimeType = (char *) xmlStrndup(mime, last - mime);
 776         charset = xmlStrstr(BAD_CAST ctxt->contentType, BAD_CAST "charset=");
 777         if (charset != NULL) {
 778             charset += 8;
 779             last = charset;
 780             while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
 781                    (*last != ';') && (*last != ','))
 782                 last++;
 783             if (ctxt->encoding != NULL)
 784                 xmlFree(ctxt->encoding);
 785             ctxt->encoding = (char *) xmlStrndup(charset, last - charset);
 786         }
 787     } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Location:", 9)) {
 788         cur += 9;
 789         while ((*cur == ' ') || (*cur == '\t')) cur++;
 790         if (ctxt->location != NULL)
 791             xmlFree(ctxt->location);
 792         if (*cur == '/') {
 793             xmlChar *tmp_http = xmlStrdup(BAD_CAST "http://");
 794             xmlChar *tmp_loc =
 795                 xmlStrcat(tmp_http, (const xmlChar *) ctxt->hostname);
 796             ctxt->location =
 797                 (char *) xmlStrcat (tmp_loc, (const xmlChar *) cur);
 798         } else {
 799             ctxt->location = xmlMemStrdup(cur);
 800         }
 801     } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"WWW-Authenticate:", 17)) {
 802         cur += 17;
 803         while ((*cur == ' ') || (*cur == '\t')) cur++;
 804         if (ctxt->authHeader != NULL)
 805             xmlFree(ctxt->authHeader);
 806         ctxt->authHeader = xmlMemStrdup(cur);
 807     } else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Proxy-Authenticate:", 19)) {
 808         cur += 19;
 809         while ((*cur == ' ') || (*cur == '\t')) cur++;
 810         if (ctxt->authHeader != NULL)
 811             xmlFree(ctxt->authHeader);
 812         ctxt->authHeader = xmlMemStrdup(cur);
 813 #ifdef HAVE_ZLIB_H
 814     } else if ( !xmlStrncasecmp( BAD_CAST line, BAD_CAST"Content-Encoding:", 17) ) {
 815         cur += 17;
 816         while ((*cur == ' ') || (*cur == '\t')) cur++;
 817         if ( !xmlStrncasecmp( BAD_CAST cur, BAD_CAST"gzip", 4) ) {
 818             ctxt->usesGzip = 1;
 819
 820             ctxt->strm = xmlMalloc(sizeof(z_stream));
 821
 822             if (ctxt->strm != NULL) {
 823                 ctxt->strm->zalloc = Z_NULL;
 824                 ctxt->strm->zfree = Z_NULL;
 825                 ctxt->strm->opaque = Z_NULL;
 826                 ctxt->strm->avail_in = 0;
 827                 ctxt->strm->next_in = Z_NULL;
 828
 829                 inflateInit2( ctxt->strm, 31 );
 830             }
 831         }
 832 #endif
 833     } else if ( !xmlStrncasecmp( BAD_CAST line, BAD_CAST"Content-Length:", 15) ) {
 834         cur += 15;
 835         ctxt->ContentLength = strtol( cur, NULL, 10 );
 836     }
 837 }
 838
 839 /**
 840  * xmlNanoHTTPConnectAttempt:
 841  * @addr:  a socket address structure
 842  *
 843  * Attempt a connection to the given IP:port endpoint. It forces
 844  * non-blocking semantic on the socket, and allow 60 seconds for
 845  * the host to answer.
 846  *
 847  * Returns -1 in case of failure, the file descriptor number otherwise
 848  */
 849
 850 static SOCKET
 851 xmlNanoHTTPConnectAttempt(struct sockaddr *addr)
 852 {
 853 #ifndef HAVE_POLL_H
 854     fd_set wfd;
 855 #ifdef _WINSOCKAPI_
 856     fd_set xfd;
 857 #endif
 858     struct timeval tv;
 859 #else /* !HAVE_POLL_H */
 860     struct pollfd p;
 861 #endif /* !HAVE_POLL_H */
 862     int status;
 863
 864     int addrlen;
 865
 866     SOCKET s;
 867
 868 #ifdef SUPPORT_IP6
 869     if (addr->sa_family == AF_INET6) {
 870         s = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP);
 871         addrlen = sizeof(struct sockaddr_in6);
 872     } else
 873 #endif
 874     {
 875         s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 876         addrlen = sizeof(struct sockaddr_in);
 877     }
 878     if (s == INVALID_SOCKET) {
 879 #ifdef DEBUG_HTTP
 880         perror("socket");
 881 #endif
 882         __xmlIOErr(XML_FROM_HTTP, 0, "socket failed\n");
 883         return INVALID_SOCKET;
 884     }
 885 #ifdef _WINSOCKAPI_
 886     {
 887         u_long one = 1;
 888
 889         status = ioctlsocket(s, FIONBIO, &one) == SOCKET_ERROR ? -1 : 0;
 890     }
 891 #else /* _WINSOCKAPI_ */
 892 #if defined(VMS)
 893     {
 894         int enable = 1;
 895
 896         status = ioctl(s, FIONBIO, &enable);
 897     }
 898 #else /* VMS */
 899 #if defined(__BEOS__) && !defined(__HAIKU__)
 900     {
 901         bool noblock = true;
 902
 903         status =
 904             setsockopt(s, SOL_SOCKET, SO_NONBLOCK, &noblock,
 905                        sizeof(noblock));
 906     }
 907 #else /* __BEOS__ */
 908     if ((status = fcntl(s, F_GETFL, 0)) != -1) {
 909 #ifdef O_NONBLOCK
 910         status |= O_NONBLOCK;
 911 #else /* O_NONBLOCK */
 912 #ifdef F_NDELAY
 913         status |= F_NDELAY;
 914 #endif /* F_NDELAY */
 915 #endif /* !O_NONBLOCK */
 916         status = fcntl(s, F_SETFL, status);
 917     }
 918     if (status < 0) {
 919 #ifdef DEBUG_HTTP
 920         perror("nonblocking");
 921 #endif
 922         __xmlIOErr(XML_FROM_HTTP, 0, "error setting non-blocking IO\n");
 923         closesocket(s);
 924         return INVALID_SOCKET;
 925     }
 926 #endif /* !__BEOS__ */
 927 #endif /* !VMS */
 928 #endif /* !_WINSOCKAPI_ */
 929
 930     if (connect(s, addr, addrlen) == -1) {
 931         switch (socket_errno()) {
 932             case EINPROGRESS:
 933             case EWOULDBLOCK:
 934                 break;
 935             default:
 936                 __xmlIOErr(XML_FROM_HTTP, 0,
 937                            "error connecting to HTTP server");
 938                 closesocket(s);
 939                 return INVALID_SOCKET;
 940         }
 941     }
 942 #ifndef HAVE_POLL_H
 943     tv.tv_sec = timeout;
 944     tv.tv_usec = 0;
 945
 946 #ifdef _MSC_VER
 947 #pragma warning(push)
 948 #pragma warning(disable: 4018)
 949 #endif
 950 #ifndef _WINSOCKAPI_
 951     if (s > FD_SETSIZE)
 952         return INVALID_SOCKET;
 953 #endif
 954     FD_ZERO(&wfd);
 955     FD_SET(s, &wfd);
 956
 957 #ifdef _WINSOCKAPI_
 958     FD_ZERO(&xfd);
 959     FD_SET(s, &xfd);
 960
 961     switch (select(s + 1, NULL, &wfd, &xfd, &tv))
 962 #else
 963     switch (select(s + 1, NULL, &wfd, NULL, &tv))
 964 #endif
 965 #ifdef _MSC_VER
 966 #pragma warning(pop)
 967 #endif
 968
 969 #else /* !HAVE_POLL_H */
 970     p.fd = s;
 971     p.events = POLLOUT;
 972     switch (poll(&p, 1, timeout * 1000))
 973 #endif /* !HAVE_POLL_H */
 974
 975     {
 976         case 0:
 977             /* Time out */
 978             __xmlIOErr(XML_FROM_HTTP, 0, "Connect attempt timed out");
 979             closesocket(s);
 980             return INVALID_SOCKET;
 981         case -1:
 982             /* Ermm.. ?? */
 983             __xmlIOErr(XML_FROM_HTTP, 0, "Connect failed");
 984             closesocket(s);
 985             return INVALID_SOCKET;
 986     }
 987
 988 #ifndef HAVE_POLL_H
 989     if (FD_ISSET(s, &wfd)
 990 #ifdef _WINSOCKAPI_
 991         || FD_ISSET(s, &xfd)
 992 #endif
 993         )
 994 #else /* !HAVE_POLL_H */
 995     if (p.revents == POLLOUT)
 996 #endif /* !HAVE_POLL_H */
 997     {
 998         XML_SOCKLEN_T len;
 999
1000         len = sizeof(status);
1001 #ifdef SO_ERROR
1002         if (getsockopt(s, SOL_SOCKET, SO_ERROR, (char *) &status, &len) <
1003             0) {
1004             /* Solaris error code */
1005             __xmlIOErr(XML_FROM_HTTP, 0, "getsockopt failed\n");
1006             closesocket(s);
1007             return INVALID_SOCKET;
1008         }
1009 #endif
1010         if (status) {
1011             __xmlIOErr(XML_FROM_HTTP, 0,
1012                        "Error connecting to remote host");
1013             closesocket(s);
1014             errno = status;
1015             return INVALID_SOCKET;
1016         }
1017     } else {
1018         /* pbm */
1019         __xmlIOErr(XML_FROM_HTTP, 0, "select failed\n");
1020         closesocket(s);
1021         return INVALID_SOCKET;
1022     }
1023
1024     return (s);
1025 }
1026
1027 /**
1028  * xmlNanoHTTPConnectHost:
1029  * @host:  the host name
1030  * @port:  the port number
1031  *
1032  * Attempt a connection to the given host:port endpoint. It tries
1033  * the multiple IP provided by the DNS if available.
1034  *
1035  * Returns -1 in case of failure, the file descriptor number otherwise
1036  */
1037
1038 static SOCKET
1039 xmlNanoHTTPConnectHost(const char *host, int port)
1040 {
1041     struct hostent *h;
1042     struct sockaddr *addr = NULL;
1043     struct in_addr ia;
1044     struct sockaddr_in sockin;
1045
1046 #ifdef SUPPORT_IP6
1047     struct in6_addr ia6;
1048     struct sockaddr_in6 sockin6;
1049 #endif
1050     int i;
1051     SOCKET s;
1052
1053     memset (&sockin, 0, sizeof(sockin));
1054 #ifdef SUPPORT_IP6
1055     memset (&sockin6, 0, sizeof(sockin6));
1056 #endif
1057
1058 #if !defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && defined(RES_USE_INET6)
1059     if (have_ipv6 ())
1060     {
1061         if (!(_res.options & RES_INIT))
1062             res_init();
1063         _res.options |= RES_USE_INET6;
1064     }
1065 #endif
1066
1067 #if defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && !defined(_WIN32)
1068     if (have_ipv6 ())
1069 #endif
1070 #if defined(HAVE_GETADDRINFO) && (defined(SUPPORT_IP6) || defined(_WIN32))
1071     {
1072         int status;
1073         struct addrinfo hints, *res, *result;
1074
1075         result = NULL;
1076         memset (&hints, 0,sizeof(hints));
1077         hints.ai_socktype = SOCK_STREAM;
1078
1079         status = getaddrinfo (host, NULL, &hints, &result);
1080         if (status) {
1081             __xmlIOErr(XML_FROM_HTTP, 0, "getaddrinfo failed\n");
1082             return INVALID_SOCKET;
1083         }
1084
1085         for (res = result; res; res = res->ai_next) {
1086             if (res->ai_family == AF_INET) {
1087                 if (res->ai_addrlen > sizeof(sockin)) {
1088                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1089                     freeaddrinfo (result);
1090                     return INVALID_SOCKET;
1091                 }
1092                 memcpy (&sockin, res->ai_addr, res->ai_addrlen);
1093                 sockin.sin_port = htons (port);
1094                 addr = (struct sockaddr *)&sockin;
1095 #ifdef SUPPORT_IP6
1096             } else if (have_ipv6 () && (res->ai_family == AF_INET6)) {
1097                 if (res->ai_addrlen > sizeof(sockin6)) {
1098                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1099                     freeaddrinfo (result);
1100                     return INVALID_SOCKET;
1101                 }
1102                 memcpy (&sockin6, res->ai_addr, res->ai_addrlen);
1103                 sockin6.sin6_port = htons (port);
1104                 addr = (struct sockaddr *)&sockin6;
1105 #endif
1106             } else
1107                 continue;              /* for */
1108
1109             s = xmlNanoHTTPConnectAttempt (addr);
1110             if (s != INVALID_SOCKET) {
1111                 freeaddrinfo (result);
1112                 return (s);
1113             }
1114         }
1115
1116         if (result)
1117             freeaddrinfo (result);
1118     }
1119 #endif
1120 #if defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && !defined(_WIN32)
1121     else
1122 #endif
1123 #if !defined(HAVE_GETADDRINFO) || !defined(_WIN32)
1124     {
1125         h = gethostbyname (GETHOSTBYNAME_ARG_CAST host);
1126         if (h == NULL) {
1127
1128 /*
1129  * Okay, I got fed up by the non-portability of this error message
1130  * extraction code. it work on Linux, if it work on your platform
1131  * and one want to enable it, send me the defined(foobar) needed
1132  */
1133 #if defined(HAVE_NETDB_H) && defined(HOST_NOT_FOUND) && defined(linux)
1134             const char *h_err_txt = "";
1135
1136             switch (h_errno) {
1137                 case HOST_NOT_FOUND:
1138                     h_err_txt = "Authoritive host not found";
1139                     break;
1140
1141                 case TRY_AGAIN:
1142                     h_err_txt =
1143                         "Non-authoritive host not found or server failure.";
1144                     break;
1145
1146                 case NO_RECOVERY:
1147                     h_err_txt =
1148                         "Non-recoverable errors:  FORMERR, REFUSED, or NOTIMP.";
1149                     break;
1150
1151 #ifdef NO_ADDRESS
1152                 case NO_ADDRESS:
1153                     h_err_txt =
1154                         "Valid name, no data record of requested type.";
1155                     break;
1156 #endif
1157
1158                 default:
1159                     h_err_txt = "No error text defined.";
1160                     break;
1161             }
1162             __xmlIOErr(XML_FROM_HTTP, 0, h_err_txt);
1163 #else
1164             __xmlIOErr(XML_FROM_HTTP, 0, "Failed to resolve host");
1165 #endif
1166             return INVALID_SOCKET;
1167         }
1168
1169         for (i = 0; h->h_addr_list[i]; i++) {
1170             if (h->h_addrtype == AF_INET) {
1171                 /* A records (IPv4) */
1172                 if ((unsigned int) h->h_length > sizeof(ia)) {
1173                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1174                     return INVALID_SOCKET;
1175                 }
1176                 memcpy (&ia, h->h_addr_list[i], h->h_length);
1177                 sockin.sin_family = h->h_addrtype;
1178                 sockin.sin_addr = ia;
1179                 sockin.sin_port = (unsigned short)htons ((unsigned short)port);
1180                 addr = (struct sockaddr *) &sockin;
1181 #ifdef SUPPORT_IP6
1182             } else if (have_ipv6 () && (h->h_addrtype == AF_INET6)) {
1183                 /* AAAA records (IPv6) */
1184                 if ((unsigned int) h->h_length > sizeof(ia6)) {
1185                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1186                     return INVALID_SOCKET;
1187                 }
1188                 memcpy (&ia6, h->h_addr_list[i], h->h_length);
1189                 sockin6.sin6_family = h->h_addrtype;
1190                 sockin6.sin6_addr = ia6;
1191                 sockin6.sin6_port = htons (port);
1192                 addr = (struct sockaddr *) &sockin6;
1193 #endif
1194             } else
1195                 break;              /* for */
1196
1197             s = xmlNanoHTTPConnectAttempt (addr);
1198             if (s != INVALID_SOCKET)
1199                 return (s);
1200         }
1201     }
1202 #endif
1203
1204 #ifdef DEBUG_HTTP
1205     xmlGenericError(xmlGenericErrorContext,
1206                     "xmlNanoHTTPConnectHost:  unable to connect to '%s'.\n",
1207                     host);
1208 #endif
1209     return INVALID_SOCKET;
1210 }
1211
1212
1213 /**
1214  * xmlNanoHTTPOpen:
1215  * @URL:  The URL to load
1216  * @contentType:  if available the Content-Type information will be
1217  *                returned at that location
1218  *
1219  * This function try to open a connection to the indicated resource
1220  * via HTTP GET.
1221  *
1222  * Returns NULL in case of failure, otherwise a request handler.
1223  *     The contentType, if provided must be freed by the caller
1224  */
1225
1226 void*
1227 xmlNanoHTTPOpen(const char *URL, char **contentType) {
1228     if (contentType != NULL) *contentType = NULL;
1229     return(xmlNanoHTTPMethod(URL, NULL, NULL, contentType, NULL, 0));
1230 }
1231
1232 /**
1233  * xmlNanoHTTPOpenRedir:
1234  * @URL:  The URL to load
1235  * @contentType:  if available the Content-Type information will be
1236  *                returned at that location
1237  * @redir: if available the redirected URL will be returned
1238  *
1239  * This function try to open a connection to the indicated resource
1240  * via HTTP GET.
1241  *
1242  * Returns NULL in case of failure, otherwise a request handler.
1243  *     The contentType, if provided must be freed by the caller
1244  */
1245
1246 void*
1247 xmlNanoHTTPOpenRedir(const char *URL, char **contentType, char **redir) {
1248     if (contentType != NULL) *contentType = NULL;
1249     if (redir != NULL) *redir = NULL;
1250     return(xmlNanoHTTPMethodRedir(URL, NULL, NULL, contentType, redir, NULL,0));
1251 }
1252
1253 /**
1254  * xmlNanoHTTPRead:
1255  * @ctx:  the HTTP context
1256  * @dest:  a buffer
1257  * @len:  the buffer length
1258  *
1259  * This function tries to read @len bytes from the existing HTTP connection
1260  * and saves them in @dest. This is a blocking call.
1261  *
1262  * Returns the number of byte read. 0 is an indication of an end of connection.
1263  *         -1 indicates a parameter error.
1264  */
1265 int
1266 xmlNanoHTTPRead(void *ctx, void *dest, int len) {
1267     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1268 #ifdef HAVE_ZLIB_H
1269     int bytes_read = 0;
1270     int orig_avail_in;
1271     int z_ret;
1272 #endif
1273
1274     if (ctx == NULL) return(-1);
1275     if (dest == NULL) return(-1);
1276     if (len <= 0) return(0);
1277
1278 #ifdef HAVE_ZLIB_H
1279     if (ctxt->usesGzip == 1) {
1280         if (ctxt->strm == NULL) return(0);
1281
1282         ctxt->strm->next_out = dest;
1283         ctxt->strm->avail_out = len;
1284         ctxt->strm->avail_in = ctxt->inptr - ctxt->inrptr;
1285
1286         while (ctxt->strm->avail_out > 0 &&
1287                (ctxt->strm->avail_in > 0 || xmlNanoHTTPRecv(ctxt) > 0)) {
1288             orig_avail_in = ctxt->strm->avail_in =
1289                             ctxt->inptr - ctxt->inrptr - bytes_read;
1290             ctxt->strm->next_in = BAD_CAST (ctxt->inrptr + bytes_read);
1291
1292             z_ret = inflate(ctxt->strm, Z_NO_FLUSH);
1293             bytes_read += orig_avail_in - ctxt->strm->avail_in;
1294
1295             if (z_ret != Z_OK) break;
1296         }
1297
1298         ctxt->inrptr += bytes_read;
1299         return(len - ctxt->strm->avail_out);
1300     }
1301 #endif
1302
1303     while (ctxt->inptr - ctxt->inrptr < len) {
1304         if (xmlNanoHTTPRecv(ctxt) <= 0) break;
1305     }
1306     if (ctxt->inptr - ctxt->inrptr < len)
1307         len = ctxt->inptr - ctxt->inrptr;
1308     memcpy(dest, ctxt->inrptr, len);
1309     ctxt->inrptr += len;
1310     return(len);
1311 }
1312
1313 /**
1314  * xmlNanoHTTPClose:
1315  * @ctx:  the HTTP context
1316  *
1317  * This function closes an HTTP context, it ends up the connection and
1318  * free all data related to it.
1319  */
1320 void
1321 xmlNanoHTTPClose(void *ctx) {
1322     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1323
1324     if (ctx == NULL) return;
1325
1326     xmlNanoHTTPFreeCtxt(ctxt);
1327 }
1328
1329 /**
1330  * xmlNanoHTTPMethodRedir:
1331  * @URL:  The URL to load
1332  * @method:  the HTTP method to use
1333  * @input:  the input string if any
1334  * @contentType:  the Content-Type information IN and OUT
1335  * @redir:  the redirected URL OUT
1336  * @headers:  the extra headers
1337  * @ilen:  input length
1338  *
1339  * This function try to open a connection to the indicated resource
1340  * via HTTP using the given @method, adding the given extra headers
1341  * and the input buffer for the request content.
1342  *
1343  * Returns NULL in case of failure, otherwise a request handler.
1344  *     The contentType, or redir, if provided must be freed by the caller
1345  */
1346
1347 void*
1348 xmlNanoHTTPMethodRedir(const char *URL, const char *method, const char *input,
1349                   char **contentType, char **redir,
1350                   const char *headers, int ilen ) {
1351     xmlNanoHTTPCtxtPtr ctxt;
1352     char *bp, *p;
1353     int blen;
1354     SOCKET ret;
1355     int nbRedirects = 0;
1356     char *redirURL = NULL;
1357 #ifdef DEBUG_HTTP
1358     int xmt_bytes;
1359 #endif
1360
1361     if (URL == NULL) return(NULL);
1362     if (method == NULL) method = "GET";
1363     xmlNanoHTTPInit();
1364
1365 retry:
1366     if (redirURL == NULL) {
1367         ctxt = xmlNanoHTTPNewCtxt(URL);
1368         if (ctxt == NULL)
1369             return(NULL);
1370     } else {
1371         ctxt = xmlNanoHTTPNewCtxt(redirURL);
1372         if (ctxt == NULL)
1373             return(NULL);
1374         ctxt->location = xmlMemStrdup(redirURL);
1375     }
1376
1377     if ((ctxt->protocol == NULL) || (strcmp(ctxt->protocol, "http"))) {
1378         __xmlIOErr(XML_FROM_HTTP, XML_HTTP_URL_SYNTAX, "Not a valid HTTP URI");
1379         xmlNanoHTTPFreeCtxt(ctxt);
1380         if (redirURL != NULL) xmlFree(redirURL);
1381         return(NULL);
1382     }
1383     if (ctxt->hostname == NULL) {
1384         __xmlIOErr(XML_FROM_HTTP, XML_HTTP_UNKNOWN_HOST,
1385                    "Failed to identify host in URI");
1386         xmlNanoHTTPFreeCtxt(ctxt);
1387         if (redirURL != NULL) xmlFree(redirURL);
1388         return(NULL);
1389     }
1390     if (proxy) {
1391         blen = strlen(ctxt->hostname) * 2 + 16;
1392         ret = xmlNanoHTTPConnectHost(proxy, proxyPort);
1393     }
1394     else {
1395         blen = strlen(ctxt->hostname);
1396         ret = xmlNanoHTTPConnectHost(ctxt->hostname, ctxt->port);
1397     }
1398     if (ret == INVALID_SOCKET) {
1399         xmlNanoHTTPFreeCtxt(ctxt);
1400         if (redirURL != NULL) xmlFree(redirURL);
1401         return(NULL);
1402     }
1403     ctxt->fd = ret;
1404
1405     if (input == NULL)
1406         ilen = 0;
1407     else
1408         blen += 36;
1409
1410     if (headers != NULL)
1411         blen += strlen(headers) + 2;
1412     if (contentType && *contentType)
1413         /* reserve for string plus 'Content-Type: \r\n" */
1414         blen += strlen(*contentType) + 16;
1415     if (ctxt->query != NULL)
1416         /* 1 for '?' */
1417         blen += strlen(ctxt->query) + 1;
1418     blen += strlen(method) + strlen(ctxt->path) + 24;
1419 #ifdef HAVE_ZLIB_H
1420     /* reserve for possible 'Accept-Encoding: gzip' string */
1421     blen += 23;
1422 #endif
1423     if (ctxt->port != 80) {
1424         /* reserve space for ':xxxxx', incl. potential proxy */
1425         if (proxy)
1426             blen += 12;
1427         else
1428             blen += 6;
1429     }
1430     bp = (char*)xmlMallocAtomic(blen);
1431     if ( bp == NULL ) {
1432         xmlNanoHTTPFreeCtxt( ctxt );
1433         xmlHTTPErrMemory("allocating header buffer");
1434         return ( NULL );
1435     }
1436
1437     p = bp;
1438
1439     if (proxy) {
1440         if (ctxt->port != 80) {
1441             p += snprintf( p, blen - (p - bp), "%s http://%s:%d%s",
1442                         method, ctxt->hostname,
1443                         ctxt->port, ctxt->path );
1444         }
1445         else
1446             p += snprintf( p, blen - (p - bp), "%s http://%s%s", method,
1447                         ctxt->hostname, ctxt->path);
1448     }
1449     else
1450         p += snprintf( p, blen - (p - bp), "%s %s", method, ctxt->path);
1451
1452     if (ctxt->query != NULL)
1453         p += snprintf( p, blen - (p - bp), "?%s", ctxt->query);
1454
1455     if (ctxt->port == 80) {
1456         p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s\r\n",
1457                     ctxt->hostname);
1458     } else {
1459         p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s:%d\r\n",
1460                     ctxt->hostname, ctxt->port);
1461     }
1462
1463 #ifdef HAVE_ZLIB_H
1464     p += snprintf(p, blen - (p - bp), "Accept-Encoding: gzip\r\n");
1465 #endif
1466
1467     if (contentType != NULL && *contentType)
1468         p += snprintf(p, blen - (p - bp), "Content-Type: %s\r\n", *contentType);
1469
1470     if (headers != NULL)
1471         p += snprintf( p, blen - (p - bp), "%s", headers );
1472
1473     if (input != NULL)
1474         snprintf(p, blen - (p - bp), "Content-Length: %d\r\n\r\n", ilen );
1475     else
1476         snprintf(p, blen - (p - bp), "\r\n");
1477
1478 #ifdef DEBUG_HTTP
1479     xmlGenericError(xmlGenericErrorContext,
1480             "-> %s%s", proxy? "(Proxy) " : "", bp);
1481     if ((blen -= strlen(bp)+1) < 0)
1482         xmlGenericError(xmlGenericErrorContext,
1483                 "ERROR: overflowed buffer by %d bytes\n", -blen);
1484 #endif
1485     ctxt->outptr = ctxt->out = bp;
1486     ctxt->state = XML_NANO_HTTP_WRITE;
1487     blen = strlen( ctxt->out );
1488 #ifdef DEBUG_HTTP
1489     xmt_bytes = xmlNanoHTTPSend(ctxt, ctxt->out, blen );
1490     if ( xmt_bytes != blen )
1491         xmlGenericError( xmlGenericErrorContext,
1492                         "xmlNanoHTTPMethodRedir:  Only %d of %d %s %s\n",
1493                         xmt_bytes, blen,
1494                         "bytes of HTTP headers sent to host",
1495                         ctxt->hostname );
1496 #else
1497     xmlNanoHTTPSend(ctxt, ctxt->out, blen );
1498 #endif
1499
1500     if ( input != NULL ) {
1501 #ifdef DEBUG_HTTP
1502         xmt_bytes = xmlNanoHTTPSend( ctxt, input, ilen );
1503
1504         if ( xmt_bytes != ilen )
1505             xmlGenericError( xmlGenericErrorContext,
1506                         "xmlNanoHTTPMethodRedir:  Only %d of %d %s %s\n",
1507                         xmt_bytes, ilen,
1508                         "bytes of HTTP content sent to host",
1509                         ctxt->hostname );
1510 #else
1511         xmlNanoHTTPSend( ctxt, input, ilen );
1512 #endif
1513     }
1514
1515     ctxt->state = XML_NANO_HTTP_READ;
1516
1517     while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
1518         if (*p == 0) {
1519             ctxt->content = ctxt->inrptr;
1520             xmlFree(p);
1521             break;
1522         }
1523         xmlNanoHTTPScanAnswer(ctxt, p);
1524
1525 #ifdef DEBUG_HTTP
1526         xmlGenericError(xmlGenericErrorContext, "<- %s\n", p);
1527 #endif
1528         xmlFree(p);
1529     }
1530
1531     if ((ctxt->location != NULL) && (ctxt->returnValue >= 300) &&
1532         (ctxt->returnValue < 400)) {
1533 #ifdef DEBUG_HTTP
1534         xmlGenericError(xmlGenericErrorContext,
1535                 "\nRedirect to: %s\n", ctxt->location);
1536 #endif
1537         while ( xmlNanoHTTPRecv(ctxt) > 0 ) ;
1538         if (nbRedirects < XML_NANO_HTTP_MAX_REDIR) {
1539             nbRedirects++;
1540             if (redirURL != NULL)
1541                 xmlFree(redirURL);
1542             redirURL = xmlMemStrdup(ctxt->location);
1543             xmlNanoHTTPFreeCtxt(ctxt);
1544             goto retry;
1545         }
1546         xmlNanoHTTPFreeCtxt(ctxt);
1547         if (redirURL != NULL) xmlFree(redirURL);
1548 #ifdef DEBUG_HTTP
1549         xmlGenericError(xmlGenericErrorContext,
1550                 "xmlNanoHTTPMethodRedir: Too many redirects, aborting ...\n");
1551 #endif
1552         return(NULL);
1553     }
1554
1555     if (contentType != NULL) {
1556         if (ctxt->contentType != NULL)
1557             *contentType = xmlMemStrdup(ctxt->contentType);
1558         else
1559             *contentType = NULL;
1560     }
1561
1562     if ((redir != NULL) && (redirURL != NULL)) {
1563         *redir = redirURL;
1564     } else {
1565         if (redirURL != NULL)
1566             xmlFree(redirURL);
1567         if (redir != NULL)
1568             *redir = NULL;
1569     }
1570
1571 #ifdef DEBUG_HTTP
1572     if (ctxt->contentType != NULL)
1573         xmlGenericError(xmlGenericErrorContext,
1574                 "\nCode %d, content-type '%s'\n\n",
1575                ctxt->returnValue, ctxt->contentType);
1576     else
1577         xmlGenericError(xmlGenericErrorContext,
1578                 "\nCode %d, no content-type\n\n",
1579                ctxt->returnValue);
1580 #endif
1581
1582     return((void *) ctxt);
1583 }
1584
1585 /**
1586  * xmlNanoHTTPMethod:
1587  * @URL:  The URL to load
1588  * @method:  the HTTP method to use
1589  * @input:  the input string if any
1590  * @contentType:  the Content-Type information IN and OUT
1591  * @headers:  the extra headers
1592  * @ilen:  input length
1593  *
1594  * This function try to open a connection to the indicated resource
1595  * via HTTP using the given @method, adding the given extra headers
1596  * and the input buffer for the request content.
1597  *
1598  * Returns NULL in case of failure, otherwise a request handler.
1599  *     The contentType, if provided must be freed by the caller
1600  */
1601
1602 void*
1603 xmlNanoHTTPMethod(const char *URL, const char *method, const char *input,
1604                   char **contentType, const char *headers, int ilen) {
1605     return(xmlNanoHTTPMethodRedir(URL, method, input, contentType,
1606                                   NULL, headers, ilen));
1607 }
1608
1609 /**
1610  * xmlNanoHTTPFetch:
1611  * @URL:  The URL to load
1612  * @filename:  the filename where the content should be saved
1613  * @contentType:  if available the Content-Type information will be
1614  *                returned at that location
1615  *
1616  * This function try to fetch the indicated resource via HTTP GET
1617  * and save it's content in the file.
1618  *
1619  * Returns -1 in case of failure, 0 incase of success. The contentType,
1620  *     if provided must be freed by the caller
1621  */
1622 int
1623 xmlNanoHTTPFetch(const char *URL, const char *filename, char **contentType) {
1624     void *ctxt = NULL;
1625     char *buf = NULL;
1626     int fd;
1627     int len;
1628     int ret = 0;
1629
1630     if (filename == NULL) return(-1);
1631     ctxt = xmlNanoHTTPOpen(URL, contentType);
1632     if (ctxt == NULL) return(-1);
1633
1634     if (!strcmp(filename, "-"))
1635         fd = 0;
1636     else {
1637         fd = open(filename, O_CREAT | O_WRONLY, 00644);
1638         if (fd < 0) {
1639             xmlNanoHTTPClose(ctxt);
1640             if ((contentType != NULL) && (*contentType != NULL)) {
1641                 xmlFree(*contentType);
1642                 *contentType = NULL;
1643             }
1644             return(-1);
1645         }
1646     }
1647
1648     xmlNanoHTTPFetchContent( ctxt, &buf, &len );
1649     if ( len > 0 ) {
1650         if (write(fd, buf, len) == -1) {
1651             ret = -1;
1652         }
1653     }
1654
1655     xmlNanoHTTPClose(ctxt);
1656     close(fd);
1657     return(ret);
1658 }
1659
1660 #ifdef LIBXML_OUTPUT_ENABLED
1661 /**
1662  * xmlNanoHTTPSave:
1663  * @ctxt:  the HTTP context
1664  * @filename:  the filename where the content should be saved
1665  *
1666  * This function saves the output of the HTTP transaction to a file
1667  * It closes and free the context at the end
1668  *
1669  * Returns -1 in case of failure, 0 incase of success.
1670  */
1671 int
1672 xmlNanoHTTPSave(void *ctxt, const char *filename) {
1673     char *buf = NULL;
1674     int fd;
1675     int len;
1676     int ret = 0;
1677
1678     if ((ctxt == NULL) || (filename == NULL)) return(-1);
1679
1680     if (!strcmp(filename, "-"))
1681         fd = 0;
1682     else {
1683         fd = open(filename, O_CREAT | O_WRONLY, 0666);
1684         if (fd < 0) {
1685             xmlNanoHTTPClose(ctxt);
1686             return(-1);
1687         }
1688     }
1689
1690     xmlNanoHTTPFetchContent( ctxt, &buf, &len );
1691     if ( len > 0 ) {
1692         if (write(fd, buf, len) == -1) {
1693             ret = -1;
1694         }
1695     }
1696
1697     xmlNanoHTTPClose(ctxt);
1698     close(fd);
1699     return(ret);
1700 }
1701 #endif /* LIBXML_OUTPUT_ENABLED */
1702
1703 /**
1704  * xmlNanoHTTPReturnCode:
1705  * @ctx:  the HTTP context
1706  *
1707  * Get the latest HTTP return code received
1708  *
1709  * Returns the HTTP return code for the request.
1710  */
1711 int
1712 xmlNanoHTTPReturnCode(void *ctx) {
1713     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1714
1715     if (ctxt == NULL) return(-1);
1716
1717     return(ctxt->returnValue);
1718 }
1719
1720 /**
1721  * xmlNanoHTTPAuthHeader:
1722  * @ctx:  the HTTP context
1723  *
1724  * Get the authentication header of an HTTP context
1725  *
1726  * Returns the stashed value of the WWW-Authenticate or Proxy-Authenticate
1727  * header.
1728  */
1729 const char *
1730 xmlNanoHTTPAuthHeader(void *ctx) {
1731     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1732
1733     if (ctxt == NULL) return(NULL);
1734
1735     return(ctxt->authHeader);
1736 }
1737
1738 /**
1739  * xmlNanoHTTPContentLength:
1740  * @ctx:  the HTTP context
1741  *
1742  * Provides the specified content length from the HTTP header.
1743  *
1744  * Return the specified content length from the HTTP header.  Note that
1745  * a value of -1 indicates that the content length element was not included in
1746  * the response header.
1747  */
1748 int
1749 xmlNanoHTTPContentLength( void * ctx ) {
1750     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1751
1752     return ( ( ctxt == NULL ) ? -1 : ctxt->ContentLength );
1753 }
1754
1755 /**
1756  * xmlNanoHTTPRedir:
1757  * @ctx:  the HTTP context
1758  *
1759  * Provides the specified redirection URL if available from the HTTP header.
1760  *
1761  * Return the specified redirection URL or NULL if not redirected.
1762  */
1763 const char *
1764 xmlNanoHTTPRedir( void * ctx ) {
1765     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1766
1767     return ( ( ctxt == NULL ) ? NULL : ctxt->location );
1768 }
1769
1770 /**
1771  * xmlNanoHTTPEncoding:
1772  * @ctx:  the HTTP context
1773  *
1774  * Provides the specified encoding if specified in the HTTP headers.
1775  *
1776  * Return the specified encoding or NULL if not available
1777  */
1778 const char *
1779 xmlNanoHTTPEncoding( void * ctx ) {
1780     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1781
1782     return ( ( ctxt == NULL ) ? NULL : ctxt->encoding );
1783 }
1784
1785 /**
1786  * xmlNanoHTTPMimeType:
1787  * @ctx:  the HTTP context
1788  *
1789  * Provides the specified Mime-Type if specified in the HTTP headers.
1790  *
1791  * Return the specified Mime-Type or NULL if not available
1792  */
1793 const char *
1794 xmlNanoHTTPMimeType( void * ctx ) {
1795     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1796
1797     return ( ( ctxt == NULL ) ? NULL : ctxt->mimeType );
1798 }
1799
1800 /**
1801  * xmlNanoHTTPFetchContent:
1802  * @ctx:  the HTTP context
1803  * @ptr:  pointer to set to the content buffer.
1804  * @len:  integer pointer to hold the length of the content
1805  *
1806  * Check if all the content was read
1807  *
1808  * Returns 0 if all the content was read and available, returns
1809  * -1 if received content length was less than specified or an error
1810  * occurred.
1811  */
1812 static int
1813 xmlNanoHTTPFetchContent( void * ctx, char ** ptr, int * len ) {
1814     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1815
1816     int                 rc = 0;
1817     int                 cur_lgth;
1818     int                 rcvd_lgth;
1819     int                 dummy_int;
1820     char *              dummy_ptr = NULL;
1821
1822     /*  Dummy up return input parameters if not provided  */
1823
1824     if ( len == NULL )
1825         len = &dummy_int;
1826
1827     if ( ptr == NULL )
1828         ptr = &dummy_ptr;
1829
1830     /*  But can't work without the context pointer  */
1831
1832     if ( ( ctxt == NULL ) || ( ctxt->content == NULL ) ) {
1833         *len = 0;
1834         *ptr = NULL;
1835         return ( -1 );
1836     }
1837
1838     rcvd_lgth = ctxt->inptr - ctxt->content;
1839
1840     while ( (cur_lgth = xmlNanoHTTPRecv( ctxt )) > 0 ) {
1841
1842         rcvd_lgth += cur_lgth;
1843         if ( (ctxt->ContentLength > 0) && (rcvd_lgth >= ctxt->ContentLength) )
1844             break;
1845     }
1846
1847     *ptr = ctxt->content;
1848     *len = rcvd_lgth;
1849
1850     if ( ( ctxt->ContentLength > 0 ) && ( rcvd_lgth < ctxt->ContentLength ) )
1851         rc = -1;
1852     else if ( rcvd_lgth == 0 )
1853         rc = -1;
1854
1855     return ( rc );
1856 }
1857
1858 #ifdef STANDALONE
1859 int main(int argc, char **argv) {
1860     char *contentType = NULL;
1861
1862     if (argv[1] != NULL) {
1863         if (argv[2] != NULL)
1864             xmlNanoHTTPFetch(argv[1], argv[2], &contentType);
1865         else
1866             xmlNanoHTTPFetch(argv[1], "-", &contentType);
1867         if (contentType != NULL) xmlFree(contentType);
1868     } else {
1869         xmlGenericError(xmlGenericErrorContext,
1870                 "%s: minimal HTTP GET implementation\n", argv[0]);
1871         xmlGenericError(xmlGenericErrorContext,
1872                 "\tusage %s [ URL [ filename ] ]\n", argv[0]);
1873     }
1874     xmlNanoHTTPCleanup();
1875     xmlMemoryDump();
1876     return(0);
1877 }
1878 #endif /* STANDALONE */
1879 #else /* !LIBXML_HTTP_ENABLED */
1880 #ifdef STANDALONE
1881 #include <stdio.h>
1882 int main(int argc, char **argv) {
1883     xmlGenericError(xmlGenericErrorContext,
1884             "%s : HTTP support not compiled in\n", argv[0]);
1885     return(0);
1886 }
1887 #endif /* STANDALONE */
1888 #endif /* LIBXML_HTTP_ENABLED */
1889 #define bottom_nanohttp
1890 #include "elfgcchack.h"