release/src/router/libxml2/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, 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             return INVALID_SOCKET;
1007         }
1008 #endif
1009         if (status) {
1010             __xmlIOErr(XML_FROM_HTTP, 0,
1011                        "Error connecting to remote host");
1012             closesocket(s);
1013             errno = status;
1014             return INVALID_SOCKET;
1015         }
1016     } else {
1017         /* pbm */
1018         __xmlIOErr(XML_FROM_HTTP, 0, "select failed\n");
1019         closesocket(s);
1020         return INVALID_SOCKET;
1021     }
1022
1023     return (s);
1024 }
1025
1026 /**
1027  * xmlNanoHTTPConnectHost:
1028  * @host:  the host name
1029  * @port:  the port number
1030  *
1031  * Attempt a connection to the given host:port endpoint. It tries
1032  * the multiple IP provided by the DNS if available.
1033  *
1034  * Returns -1 in case of failure, the file descriptor number otherwise
1035  */
1036
1037 static SOCKET
1038 xmlNanoHTTPConnectHost(const char *host, int port)
1039 {
1040     struct hostent *h;
1041     struct sockaddr *addr = NULL;
1042     struct in_addr ia;
1043     struct sockaddr_in sockin;
1044
1045 #ifdef SUPPORT_IP6
1046     struct in6_addr ia6;
1047     struct sockaddr_in6 sockin6;
1048 #endif
1049     int i;
1050     SOCKET s;
1051
1052     memset (&sockin, 0, sizeof(sockin));
1053 #ifdef SUPPORT_IP6
1054     memset (&sockin6, 0, sizeof(sockin6));
1055 #endif
1056
1057 #if !defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && defined(RES_USE_INET6)
1058     if (have_ipv6 ())
1059     {
1060         if (!(_res.options & RES_INIT))
1061             res_init();
1062         _res.options |= RES_USE_INET6;
1063     }
1064 #endif
1065
1066 #if defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && !defined(_WIN32)
1067     if (have_ipv6 ())
1068 #endif
1069 #if defined(HAVE_GETADDRINFO) && (defined(SUPPORT_IP6) || defined(_WIN32))
1070     {
1071         int status;
1072         struct addrinfo hints, *res, *result;
1073
1074         result = NULL;
1075         memset (&hints, 0,sizeof(hints));
1076         hints.ai_socktype = SOCK_STREAM;
1077
1078         status = getaddrinfo (host, NULL, &hints, &result);
1079         if (status) {
1080             __xmlIOErr(XML_FROM_HTTP, 0, "getaddrinfo failed\n");
1081             return INVALID_SOCKET;
1082         }
1083
1084         for (res = result; res; res = res->ai_next) {
1085             if (res->ai_family == AF_INET) {
1086                 if (res->ai_addrlen > sizeof(sockin)) {
1087                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1088                     freeaddrinfo (result);
1089                     return INVALID_SOCKET;
1090                 }
1091                 memcpy (&sockin, res->ai_addr, res->ai_addrlen);
1092                 sockin.sin_port = htons (port);
1093                 addr = (struct sockaddr *)&sockin;
1094 #ifdef SUPPORT_IP6
1095             } else if (have_ipv6 () && (res->ai_family == AF_INET6)) {
1096                 if (res->ai_addrlen > sizeof(sockin6)) {
1097                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1098                     freeaddrinfo (result);
1099                     return INVALID_SOCKET;
1100                 }
1101                 memcpy (&sockin6, res->ai_addr, res->ai_addrlen);
1102                 sockin6.sin6_port = htons (port);
1103                 addr = (struct sockaddr *)&sockin6;
1104 #endif
1105             } else
1106                 continue;              /* for */
1107
1108             s = xmlNanoHTTPConnectAttempt (addr);
1109             if (s != INVALID_SOCKET) {
1110                 freeaddrinfo (result);
1111                 return (s);
1112             }
1113         }
1114
1115         if (result)
1116             freeaddrinfo (result);
1117     }
1118 #endif
1119 #if defined(HAVE_GETADDRINFO) && defined(SUPPORT_IP6) && !defined(_WIN32)
1120     else
1121 #endif
1122 #if !defined(HAVE_GETADDRINFO) || !defined(_WIN32)
1123     {
1124         h = gethostbyname (host);
1125         if (h == NULL) {
1126
1127 /*
1128  * Okay, I got fed up by the non-portability of this error message
1129  * extraction code. it work on Linux, if it work on your platform
1130  * and one want to enable it, send me the defined(foobar) needed
1131  */
1132 #if defined(HAVE_NETDB_H) && defined(HOST_NOT_FOUND) && defined(linux)
1133             const char *h_err_txt = "";
1134
1135             switch (h_errno) {
1136                 case HOST_NOT_FOUND:
1137                     h_err_txt = "Authoritive host not found";
1138                     break;
1139
1140                 case TRY_AGAIN:
1141                     h_err_txt =
1142                         "Non-authoritive host not found or server failure.";
1143                     break;
1144
1145                 case NO_RECOVERY:
1146                     h_err_txt =
1147                         "Non-recoverable errors:  FORMERR, REFUSED, or NOTIMP.";
1148                     break;
1149
1150 #ifdef NO_ADDRESS
1151                 case NO_ADDRESS:
1152                     h_err_txt =
1153                         "Valid name, no data record of requested type.";
1154                     break;
1155 #endif
1156
1157                 default:
1158                     h_err_txt = "No error text defined.";
1159                     break;
1160             }
1161             __xmlIOErr(XML_FROM_HTTP, 0, h_err_txt);
1162 #else
1163             __xmlIOErr(XML_FROM_HTTP, 0, "Failed to resolve host");
1164 #endif
1165             return INVALID_SOCKET;
1166         }
1167
1168         for (i = 0; h->h_addr_list[i]; i++) {
1169             if (h->h_addrtype == AF_INET) {
1170                 /* A records (IPv4) */
1171                 if ((unsigned int) h->h_length > sizeof(ia)) {
1172                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1173                     return INVALID_SOCKET;
1174                 }
1175                 memcpy (&ia, h->h_addr_list[i], h->h_length);
1176                 sockin.sin_family = h->h_addrtype;
1177                 sockin.sin_addr = ia;
1178                 sockin.sin_port = (unsigned short)htons ((unsigned short)port);
1179                 addr = (struct sockaddr *) &sockin;
1180 #ifdef SUPPORT_IP6
1181             } else if (have_ipv6 () && (h->h_addrtype == AF_INET6)) {
1182                 /* AAAA records (IPv6) */
1183                 if ((unsigned int) h->h_length > sizeof(ia6)) {
1184                     __xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
1185                     return INVALID_SOCKET;
1186                 }
1187                 memcpy (&ia6, h->h_addr_list[i], h->h_length);
1188                 sockin6.sin6_family = h->h_addrtype;
1189                 sockin6.sin6_addr = ia6;
1190                 sockin6.sin6_port = htons (port);
1191                 addr = (struct sockaddr *) &sockin6;
1192 #endif
1193             } else
1194                 break;              /* for */
1195
1196             s = xmlNanoHTTPConnectAttempt (addr);
1197             if (s != INVALID_SOCKET)
1198                 return (s);
1199         }
1200     }
1201 #endif
1202
1203 #ifdef DEBUG_HTTP
1204     xmlGenericError(xmlGenericErrorContext,
1205                     "xmlNanoHTTPConnectHost:  unable to connect to '%s'.\n",
1206                     host);
1207 #endif
1208     return INVALID_SOCKET;
1209 }
1210
1211
1212 /**
1213  * xmlNanoHTTPOpen:
1214  * @URL:  The URL to load
1215  * @contentType:  if available the Content-Type information will be
1216  *                returned at that location
1217  *
1218  * This function try to open a connection to the indicated resource
1219  * via HTTP GET.
1220  *
1221  * Returns NULL in case of failure, otherwise a request handler.
1222  *     The contentType, if provided must be freed by the caller
1223  */
1224
1225 void*
1226 xmlNanoHTTPOpen(const char *URL, char **contentType) {
1227     if (contentType != NULL) *contentType = NULL;
1228     return(xmlNanoHTTPMethod(URL, NULL, NULL, contentType, NULL, 0));
1229 }
1230
1231 /**
1232  * xmlNanoHTTPOpenRedir:
1233  * @URL:  The URL to load
1234  * @contentType:  if available the Content-Type information will be
1235  *                returned at that location
1236  * @redir: if available the redirected URL will be returned
1237  *
1238  * This function try to open a connection to the indicated resource
1239  * via HTTP GET.
1240  *
1241  * Returns NULL in case of failure, otherwise a request handler.
1242  *     The contentType, if provided must be freed by the caller
1243  */
1244
1245 void*
1246 xmlNanoHTTPOpenRedir(const char *URL, char **contentType, char **redir) {
1247     if (contentType != NULL) *contentType = NULL;
1248     if (redir != NULL) *redir = NULL;
1249     return(xmlNanoHTTPMethodRedir(URL, NULL, NULL, contentType, redir, NULL,0));
1250 }
1251
1252 /**
1253  * xmlNanoHTTPRead:
1254  * @ctx:  the HTTP context
1255  * @dest:  a buffer
1256  * @len:  the buffer length
1257  *
1258  * This function tries to read @len bytes from the existing HTTP connection
1259  * and saves them in @dest. This is a blocking call.
1260  *
1261  * Returns the number of byte read. 0 is an indication of an end of connection.
1262  *         -1 indicates a parameter error.
1263  */
1264 int
1265 xmlNanoHTTPRead(void *ctx, void *dest, int len) {
1266     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1267 #ifdef HAVE_ZLIB_H
1268     int bytes_read = 0;
1269     int orig_avail_in;
1270     int z_ret;
1271 #endif
1272
1273     if (ctx == NULL) return(-1);
1274     if (dest == NULL) return(-1);
1275     if (len <= 0) return(0);
1276
1277 #ifdef HAVE_ZLIB_H
1278     if (ctxt->usesGzip == 1) {
1279         if (ctxt->strm == NULL) return(0);
1280
1281         ctxt->strm->next_out = dest;
1282         ctxt->strm->avail_out = len;
1283         ctxt->strm->avail_in = ctxt->inptr - ctxt->inrptr;
1284
1285         while (ctxt->strm->avail_out > 0 &&
1286                (ctxt->strm->avail_in > 0 || xmlNanoHTTPRecv(ctxt) > 0)) {
1287             orig_avail_in = ctxt->strm->avail_in =
1288                             ctxt->inptr - ctxt->inrptr - bytes_read;
1289             ctxt->strm->next_in = BAD_CAST (ctxt->inrptr + bytes_read);
1290
1291             z_ret = inflate(ctxt->strm, Z_NO_FLUSH);
1292             bytes_read += orig_avail_in - ctxt->strm->avail_in;
1293
1294             if (z_ret != Z_OK) break;
1295         }
1296
1297         ctxt->inrptr += bytes_read;
1298         return(len - ctxt->strm->avail_out);
1299     }
1300 #endif
1301
1302     while (ctxt->inptr - ctxt->inrptr < len) {
1303         if (xmlNanoHTTPRecv(ctxt) <= 0) break;
1304     }
1305     if (ctxt->inptr - ctxt->inrptr < len)
1306         len = ctxt->inptr - ctxt->inrptr;
1307     memcpy(dest, ctxt->inrptr, len);
1308     ctxt->inrptr += len;
1309     return(len);
1310 }
1311
1312 /**
1313  * xmlNanoHTTPClose:
1314  * @ctx:  the HTTP context
1315  *
1316  * This function closes an HTTP context, it ends up the connection and
1317  * free all data related to it.
1318  */
1319 void
1320 xmlNanoHTTPClose(void *ctx) {
1321     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1322
1323     if (ctx == NULL) return;
1324
1325     xmlNanoHTTPFreeCtxt(ctxt);
1326 }
1327
1328 /**
1329  * xmlNanoHTTPMethodRedir:
1330  * @URL:  The URL to load
1331  * @method:  the HTTP method to use
1332  * @input:  the input string if any
1333  * @contentType:  the Content-Type information IN and OUT
1334  * @redir:  the redirected URL OUT
1335  * @headers:  the extra headers
1336  * @ilen:  input length
1337  *
1338  * This function try to open a connection to the indicated resource
1339  * via HTTP using the given @method, adding the given extra headers
1340  * and the input buffer for the request content.
1341  *
1342  * Returns NULL in case of failure, otherwise a request handler.
1343  *     The contentType, or redir, if provided must be freed by the caller
1344  */
1345
1346 void*
1347 xmlNanoHTTPMethodRedir(const char *URL, const char *method, const char *input,
1348                   char **contentType, char **redir,
1349                   const char *headers, int ilen ) {
1350     xmlNanoHTTPCtxtPtr ctxt;
1351     char *bp, *p;
1352     int blen;
1353     SOCKET ret;
1354     int nbRedirects = 0;
1355     char *redirURL = NULL;
1356 #ifdef DEBUG_HTTP
1357     int xmt_bytes;
1358 #endif
1359
1360     if (URL == NULL) return(NULL);
1361     if (method == NULL) method = "GET";
1362     xmlNanoHTTPInit();
1363
1364 retry:
1365     if (redirURL == NULL)
1366         ctxt = xmlNanoHTTPNewCtxt(URL);
1367     else {
1368         ctxt = xmlNanoHTTPNewCtxt(redirURL);
1369         ctxt->location = xmlMemStrdup(redirURL);
1370     }
1371
1372     if ( ctxt == NULL ) {
1373         return ( NULL );
1374     }
1375
1376     if ((ctxt->protocol == NULL) || (strcmp(ctxt->protocol, "http"))) {
1377         __xmlIOErr(XML_FROM_HTTP, XML_HTTP_URL_SYNTAX, "Not a valid HTTP URI");
1378         xmlNanoHTTPFreeCtxt(ctxt);
1379         if (redirURL != NULL) xmlFree(redirURL);
1380         return(NULL);
1381     }
1382     if (ctxt->hostname == NULL) {
1383         __xmlIOErr(XML_FROM_HTTP, XML_HTTP_UNKNOWN_HOST,
1384                    "Failed to identify host in URI");
1385         xmlNanoHTTPFreeCtxt(ctxt);
1386         if (redirURL != NULL) xmlFree(redirURL);
1387         return(NULL);
1388     }
1389     if (proxy) {
1390         blen = strlen(ctxt->hostname) * 2 + 16;
1391         ret = xmlNanoHTTPConnectHost(proxy, proxyPort);
1392     }
1393     else {
1394         blen = strlen(ctxt->hostname);
1395         ret = xmlNanoHTTPConnectHost(ctxt->hostname, ctxt->port);
1396     }
1397     if (ret == INVALID_SOCKET) {
1398         xmlNanoHTTPFreeCtxt(ctxt);
1399         if (redirURL != NULL) xmlFree(redirURL);
1400         return(NULL);
1401     }
1402     ctxt->fd = ret;
1403
1404     if (input == NULL)
1405         ilen = 0;
1406     else
1407         blen += 36;
1408
1409     if (headers != NULL)
1410         blen += strlen(headers) + 2;
1411     if (contentType && *contentType)
1412         /* reserve for string plus 'Content-Type: \r\n" */
1413         blen += strlen(*contentType) + 16;
1414     if (ctxt->query != NULL)
1415         /* 1 for '?' */
1416         blen += strlen(ctxt->query) + 1;
1417     blen += strlen(method) + strlen(ctxt->path) + 24;
1418 #ifdef HAVE_ZLIB_H
1419     /* reserve for possible 'Accept-Encoding: gzip' string */
1420     blen += 23;
1421 #endif
1422     if (ctxt->port != 80) {
1423         /* reserve space for ':xxxxx', incl. potential proxy */
1424         if (proxy)
1425             blen += 12;
1426         else
1427             blen += 6;
1428     }
1429     bp = (char*)xmlMallocAtomic(blen);
1430     if ( bp == NULL ) {
1431         xmlNanoHTTPFreeCtxt( ctxt );
1432         xmlHTTPErrMemory("allocating header buffer");
1433         return ( NULL );
1434     }
1435
1436     p = bp;
1437
1438     if (proxy) {
1439         if (ctxt->port != 80) {
1440             p += snprintf( p, blen - (p - bp), "%s http://%s:%d%s",
1441                         method, ctxt->hostname,
1442                         ctxt->port, ctxt->path );
1443         }
1444         else
1445             p += snprintf( p, blen - (p - bp), "%s http://%s%s", method,
1446                         ctxt->hostname, ctxt->path);
1447     }
1448     else
1449         p += snprintf( p, blen - (p - bp), "%s %s", method, ctxt->path);
1450
1451     if (ctxt->query != NULL)
1452         p += snprintf( p, blen - (p - bp), "?%s", ctxt->query);
1453
1454     if (ctxt->port == 80) {
1455         p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s\r\n",
1456                     ctxt->hostname);
1457     } else {
1458         p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s:%d\r\n",
1459                     ctxt->hostname, ctxt->port);
1460     }
1461
1462 #ifdef HAVE_ZLIB_H
1463     p += snprintf(p, blen - (p - bp), "Accept-Encoding: gzip\r\n");
1464 #endif
1465
1466     if (contentType != NULL && *contentType)
1467         p += snprintf(p, blen - (p - bp), "Content-Type: %s\r\n", *contentType);
1468
1469     if (headers != NULL)
1470         p += snprintf( p, blen - (p - bp), "%s", headers );
1471
1472     if (input != NULL)
1473         snprintf(p, blen - (p - bp), "Content-Length: %d\r\n\r\n", ilen );
1474     else
1475         snprintf(p, blen - (p - bp), "\r\n");
1476
1477 #ifdef DEBUG_HTTP
1478     xmlGenericError(xmlGenericErrorContext,
1479             "-> %s%s", proxy? "(Proxy) " : "", bp);
1480     if ((blen -= strlen(bp)+1) < 0)
1481         xmlGenericError(xmlGenericErrorContext,
1482                 "ERROR: overflowed buffer by %d bytes\n", -blen);
1483 #endif
1484     ctxt->outptr = ctxt->out = bp;
1485     ctxt->state = XML_NANO_HTTP_WRITE;
1486     blen = strlen( ctxt->out );
1487 #ifdef DEBUG_HTTP
1488     xmt_bytes = xmlNanoHTTPSend(ctxt, ctxt->out, blen );
1489     if ( xmt_bytes != blen )
1490         xmlGenericError( xmlGenericErrorContext,
1491                         "xmlNanoHTTPMethodRedir:  Only %d of %d %s %s\n",
1492                         xmt_bytes, blen,
1493                         "bytes of HTTP headers sent to host",
1494                         ctxt->hostname );
1495 #else
1496     xmlNanoHTTPSend(ctxt, ctxt->out, blen );
1497 #endif
1498
1499     if ( input != NULL ) {
1500 #ifdef DEBUG_HTTP
1501         xmt_bytes = xmlNanoHTTPSend( ctxt, input, ilen );
1502
1503         if ( xmt_bytes != ilen )
1504             xmlGenericError( xmlGenericErrorContext,
1505                         "xmlNanoHTTPMethodRedir:  Only %d of %d %s %s\n",
1506                         xmt_bytes, ilen,
1507                         "bytes of HTTP content sent to host",
1508                         ctxt->hostname );
1509 #else
1510         xmlNanoHTTPSend( ctxt, input, ilen );
1511 #endif
1512     }
1513
1514     ctxt->state = XML_NANO_HTTP_READ;
1515
1516     while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
1517         if (*p == 0) {
1518             ctxt->content = ctxt->inrptr;
1519             xmlFree(p);
1520             break;
1521         }
1522         xmlNanoHTTPScanAnswer(ctxt, p);
1523
1524 #ifdef DEBUG_HTTP
1525         xmlGenericError(xmlGenericErrorContext, "<- %s\n", p);
1526 #endif
1527         xmlFree(p);
1528     }
1529
1530     if ((ctxt->location != NULL) && (ctxt->returnValue >= 300) &&
1531         (ctxt->returnValue < 400)) {
1532 #ifdef DEBUG_HTTP
1533         xmlGenericError(xmlGenericErrorContext,
1534                 "\nRedirect to: %s\n", ctxt->location);
1535 #endif
1536         while ( xmlNanoHTTPRecv(ctxt) > 0 ) ;
1537         if (nbRedirects < XML_NANO_HTTP_MAX_REDIR) {
1538             nbRedirects++;
1539             if (redirURL != NULL)
1540                 xmlFree(redirURL);
1541             redirURL = xmlMemStrdup(ctxt->location);
1542             xmlNanoHTTPFreeCtxt(ctxt);
1543             goto retry;
1544         }
1545         xmlNanoHTTPFreeCtxt(ctxt);
1546         if (redirURL != NULL) xmlFree(redirURL);
1547 #ifdef DEBUG_HTTP
1548         xmlGenericError(xmlGenericErrorContext,
1549                 "xmlNanoHTTPMethodRedir: Too many redirects, aborting ...\n");
1550 #endif
1551         return(NULL);
1552     }
1553
1554     if (contentType != NULL) {
1555         if (ctxt->contentType != NULL)
1556             *contentType = xmlMemStrdup(ctxt->contentType);
1557         else
1558             *contentType = NULL;
1559     }
1560
1561     if ((redir != NULL) && (redirURL != NULL)) {
1562         *redir = redirURL;
1563     } else {
1564         if (redirURL != NULL)
1565             xmlFree(redirURL);
1566         if (redir != NULL)
1567             *redir = NULL;
1568     }
1569
1570 #ifdef DEBUG_HTTP
1571     if (ctxt->contentType != NULL)
1572         xmlGenericError(xmlGenericErrorContext,
1573                 "\nCode %d, content-type '%s'\n\n",
1574                ctxt->returnValue, ctxt->contentType);
1575     else
1576         xmlGenericError(xmlGenericErrorContext,
1577                 "\nCode %d, no content-type\n\n",
1578                ctxt->returnValue);
1579 #endif
1580
1581     return((void *) ctxt);
1582 }
1583
1584 /**
1585  * xmlNanoHTTPMethod:
1586  * @URL:  The URL to load
1587  * @method:  the HTTP method to use
1588  * @input:  the input string if any
1589  * @contentType:  the Content-Type information IN and OUT
1590  * @headers:  the extra headers
1591  * @ilen:  input length
1592  *
1593  * This function try to open a connection to the indicated resource
1594  * via HTTP using the given @method, adding the given extra headers
1595  * and the input buffer for the request content.
1596  *
1597  * Returns NULL in case of failure, otherwise a request handler.
1598  *     The contentType, if provided must be freed by the caller
1599  */
1600
1601 void*
1602 xmlNanoHTTPMethod(const char *URL, const char *method, const char *input,
1603                   char **contentType, const char *headers, int ilen) {
1604     return(xmlNanoHTTPMethodRedir(URL, method, input, contentType,
1605                                   NULL, headers, ilen));
1606 }
1607
1608 /**
1609  * xmlNanoHTTPFetch:
1610  * @URL:  The URL to load
1611  * @filename:  the filename where the content should be saved
1612  * @contentType:  if available the Content-Type information will be
1613  *                returned at that location
1614  *
1615  * This function try to fetch the indicated resource via HTTP GET
1616  * and save it's content in the file.
1617  *
1618  * Returns -1 in case of failure, 0 incase of success. The contentType,
1619  *     if provided must be freed by the caller
1620  */
1621 int
1622 xmlNanoHTTPFetch(const char *URL, const char *filename, char **contentType) {
1623     void *ctxt = NULL;
1624     char *buf = NULL;
1625     int fd;
1626     int len;
1627     int ret = 0;
1628
1629     if (filename == NULL) return(-1);
1630     ctxt = xmlNanoHTTPOpen(URL, contentType);
1631     if (ctxt == NULL) return(-1);
1632
1633     if (!strcmp(filename, "-"))
1634         fd = 0;
1635     else {
1636         fd = open(filename, O_CREAT | O_WRONLY, 00644);
1637         if (fd < 0) {
1638             xmlNanoHTTPClose(ctxt);
1639             if ((contentType != NULL) && (*contentType != NULL)) {
1640                 xmlFree(*contentType);
1641                 *contentType = NULL;
1642             }
1643             return(-1);
1644         }
1645     }
1646
1647     xmlNanoHTTPFetchContent( ctxt, &buf, &len );
1648     if ( len > 0 ) {
1649         if (write(fd, buf, len) == -1) {
1650             ret = -1;
1651         }
1652     }
1653
1654     xmlNanoHTTPClose(ctxt);
1655     close(fd);
1656     return(ret);
1657 }
1658
1659 #ifdef LIBXML_OUTPUT_ENABLED
1660 /**
1661  * xmlNanoHTTPSave:
1662  * @ctxt:  the HTTP context
1663  * @filename:  the filename where the content should be saved
1664  *
1665  * This function saves the output of the HTTP transaction to a file
1666  * It closes and free the context at the end
1667  *
1668  * Returns -1 in case of failure, 0 incase of success.
1669  */
1670 int
1671 xmlNanoHTTPSave(void *ctxt, const char *filename) {
1672     char *buf = NULL;
1673     int fd;
1674     int len;
1675     int ret = 0;
1676
1677     if ((ctxt == NULL) || (filename == NULL)) return(-1);
1678
1679     if (!strcmp(filename, "-"))
1680         fd = 0;
1681     else {
1682         fd = open(filename, O_CREAT | O_WRONLY, 0666);
1683         if (fd < 0) {
1684             xmlNanoHTTPClose(ctxt);
1685             return(-1);
1686         }
1687     }
1688
1689     xmlNanoHTTPFetchContent( ctxt, &buf, &len );
1690     if ( len > 0 ) {
1691         if (write(fd, buf, len) == -1) {
1692             ret = -1;
1693         }
1694     }
1695
1696     xmlNanoHTTPClose(ctxt);
1697     close(fd);
1698     return(ret);
1699 }
1700 #endif /* LIBXML_OUTPUT_ENABLED */
1701
1702 /**
1703  * xmlNanoHTTPReturnCode:
1704  * @ctx:  the HTTP context
1705  *
1706  * Get the latest HTTP return code received
1707  *
1708  * Returns the HTTP return code for the request.
1709  */
1710 int
1711 xmlNanoHTTPReturnCode(void *ctx) {
1712     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1713
1714     if (ctxt == NULL) return(-1);
1715
1716     return(ctxt->returnValue);
1717 }
1718
1719 /**
1720  * xmlNanoHTTPAuthHeader:
1721  * @ctx:  the HTTP context
1722  *
1723  * Get the authentication header of an HTTP context
1724  *
1725  * Returns the stashed value of the WWW-Authenticate or Proxy-Authenticate
1726  * header.
1727  */
1728 const char *
1729 xmlNanoHTTPAuthHeader(void *ctx) {
1730     xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
1731
1732     if (ctxt == NULL) return(NULL);
1733
1734     return(ctxt->authHeader);
1735 }
1736
1737 /**
1738  * xmlNanoHTTPContentLength:
1739  * @ctx:  the HTTP context
1740  *
1741  * Provides the specified content length from the HTTP header.
1742  *
1743  * Return the specified content length from the HTTP header.  Note that
1744  * a value of -1 indicates that the content length element was not included in
1745  * the response header.
1746  */
1747 int
1748 xmlNanoHTTPContentLength( void * ctx ) {
1749     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1750
1751     return ( ( ctxt == NULL ) ? -1 : ctxt->ContentLength );
1752 }
1753
1754 /**
1755  * xmlNanoHTTPRedir:
1756  * @ctx:  the HTTP context
1757  *
1758  * Provides the specified redirection URL if available from the HTTP header.
1759  *
1760  * Return the specified redirection URL or NULL if not redirected.
1761  */
1762 const char *
1763 xmlNanoHTTPRedir( void * ctx ) {
1764     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1765
1766     return ( ( ctxt == NULL ) ? NULL : ctxt->location );
1767 }
1768
1769 /**
1770  * xmlNanoHTTPEncoding:
1771  * @ctx:  the HTTP context
1772  *
1773  * Provides the specified encoding if specified in the HTTP headers.
1774  *
1775  * Return the specified encoding or NULL if not available
1776  */
1777 const char *
1778 xmlNanoHTTPEncoding( void * ctx ) {
1779     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1780
1781     return ( ( ctxt == NULL ) ? NULL : ctxt->encoding );
1782 }
1783
1784 /**
1785  * xmlNanoHTTPMimeType:
1786  * @ctx:  the HTTP context
1787  *
1788  * Provides the specified Mime-Type if specified in the HTTP headers.
1789  *
1790  * Return the specified Mime-Type or NULL if not available
1791  */
1792 const char *
1793 xmlNanoHTTPMimeType( void * ctx ) {
1794     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1795
1796     return ( ( ctxt == NULL ) ? NULL : ctxt->mimeType );
1797 }
1798
1799 /**
1800  * xmlNanoHTTPFetchContent:
1801  * @ctx:  the HTTP context
1802  * @ptr:  pointer to set to the content buffer.
1803  * @len:  integer pointer to hold the length of the content
1804  *
1805  * Check if all the content was read
1806  *
1807  * Returns 0 if all the content was read and available, returns
1808  * -1 if received content length was less than specified or an error
1809  * occurred.
1810  */
1811 static int
1812 xmlNanoHTTPFetchContent( void * ctx, char ** ptr, int * len ) {
1813     xmlNanoHTTPCtxtPtr  ctxt = (xmlNanoHTTPCtxtPtr)ctx;
1814
1815     int                 rc = 0;
1816     int                 cur_lgth;
1817     int                 rcvd_lgth;
1818     int                 dummy_int;
1819     char *              dummy_ptr = NULL;
1820
1821     /*  Dummy up return input parameters if not provided  */
1822
1823     if ( len == NULL )
1824         len = &dummy_int;
1825
1826     if ( ptr == NULL )
1827         ptr = &dummy_ptr;
1828
1829     /*  But can't work without the context pointer  */
1830
1831     if ( ( ctxt == NULL ) || ( ctxt->content == NULL ) ) {
1832         *len = 0;
1833         *ptr = NULL;
1834         return ( -1 );
1835     }
1836
1837     rcvd_lgth = ctxt->inptr - ctxt->content;
1838
1839     while ( (cur_lgth = xmlNanoHTTPRecv( ctxt )) > 0 ) {
1840
1841         rcvd_lgth += cur_lgth;
1842         if ( (ctxt->ContentLength > 0) && (rcvd_lgth >= ctxt->ContentLength) )
1843             break;
1844     }
1845
1846     *ptr = ctxt->content;
1847     *len = rcvd_lgth;
1848
1849     if ( ( ctxt->ContentLength > 0 ) && ( rcvd_lgth < ctxt->ContentLength ) )
1850         rc = -1;
1851     else if ( rcvd_lgth == 0 )
1852         rc = -1;
1853
1854     return ( rc );
1855 }
1856
1857 #ifdef STANDALONE
1858 int main(int argc, char **argv) {
1859     char *contentType = NULL;
1860
1861     if (argv[1] != NULL) {
1862         if (argv[2] != NULL)
1863             xmlNanoHTTPFetch(argv[1], argv[2], &contentType);
1864         else
1865             xmlNanoHTTPFetch(argv[1], "-", &contentType);
1866         if (contentType != NULL) xmlFree(contentType);
1867     } else {
1868         xmlGenericError(xmlGenericErrorContext,
1869                 "%s: minimal HTTP GET implementation\n", argv[0]);
1870         xmlGenericError(xmlGenericErrorContext,
1871                 "\tusage %s [ URL [ filename ] ]\n", argv[0]);
1872     }
1873     xmlNanoHTTPCleanup();
1874     xmlMemoryDump();
1875     return(0);
1876 }
1877 #endif /* STANDALONE */
1878 #else /* !LIBXML_HTTP_ENABLED */
1879 #ifdef STANDALONE
1880 #include <stdio.h>
1881 int main(int argc, char **argv) {
1882     xmlGenericError(xmlGenericErrorContext,
1883             "%s : HTTP support not compiled in\n", argv[0]);
1884     return(0);
1885 }
1886 #endif /* STANDALONE */
1887 #endif /* LIBXML_HTTP_ENABLED */
1888 #define bottom_nanohttp
1889 #include "elfgcchack.h"