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libxml2/nanohttp.c
Nick Wellnhofer 1b1e8b3c12 io: Stop invoking generic error handler for IO errors
2024-06-12 16:14:15 +02:00

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/*
* nanohttp.c: minimalist HTTP GET implementation to fetch external subsets.
* focuses on size, streamability, reentrancy and portability
*
* This is clearly not a general purpose HTTP implementation
* If you look for one, check:
* http://www.w3.org/Library/
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#define IN_LIBXML
#include "libxml.h"
#ifdef LIBXML_HTTP_ENABLED
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#elif defined (_WIN32)
#include <io.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifndef HAVE_POLL_H
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#else
#include <poll.h>
#endif
#ifdef LIBXML_ZLIB_ENABLED
#include <zlib.h>
#endif
#ifdef VMS
#include <stropts>
#define XML_SOCKLEN_T unsigned int
#endif
#if defined(_WIN32)
#include <wsockcompat.h>
#endif
#include <libxml/xmlerror.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h> /* for xmlStr(n)casecmp() */
#include <libxml/nanohttp.h>
#include <libxml/uri.h>
#include "private/error.h"
#include "private/io.h"
/**
* A couple portability macros
*/
#ifndef _WINSOCKAPI_
#define closesocket(s) close(s)
#define SOCKET int
#define INVALID_SOCKET (-1)
#endif
#ifndef XML_SOCKLEN_T
#define XML_SOCKLEN_T unsigned int
#endif
#define GETHOSTBYNAME_ARG_CAST (char *)
#define SEND_ARG2_CAST (char *)
#ifdef STANDALONE
#define xmlStrncasecmp(a, b, n) strncasecmp((char *)a, (char *)b, n)
#define xmlStrcasecmpi(a, b) strcasecmp((char *)a, (char *)b)
#endif
#define XML_NANO_HTTP_MAX_REDIR 10
#define XML_NANO_HTTP_CHUNK 4096
#define XML_NANO_HTTP_CLOSED 0
#define XML_NANO_HTTP_WRITE 1
#define XML_NANO_HTTP_READ 2
#define XML_NANO_HTTP_NONE 4
#define __xmlIOErr(domain, code, extra) ((void) 0)
typedef struct xmlNanoHTTPCtxt {
char *protocol; /* the protocol name */
char *hostname; /* the host name */
int port; /* the port */
char *path; /* the path within the URL */
char *query; /* the query string */
SOCKET fd; /* the file descriptor for the socket */
int state; /* WRITE / READ / CLOSED */
char *out; /* buffer sent (zero terminated) */
char *outptr; /* index within the buffer sent */
char *in; /* the receiving buffer */
char *content; /* the start of the content */
char *inptr; /* the next byte to read from network */
char *inrptr; /* the next byte to give back to the client */
int inlen; /* len of the input buffer */
int last; /* return code for last operation */
int returnValue; /* the protocol return value */
int version; /* the protocol version */
int ContentLength; /* specified content length from HTTP header */
char *contentType; /* the MIME type for the input */
char *location; /* the new URL in case of redirect */
char *authHeader; /* contents of {WWW,Proxy}-Authenticate header */
char *encoding; /* encoding extracted from the contentType */
char *mimeType; /* Mime-Type extracted from the contentType */
#ifdef LIBXML_ZLIB_ENABLED
z_stream *strm; /* Zlib stream object */
int usesGzip; /* "Content-Encoding: gzip" was detected */
#endif
} xmlNanoHTTPCtxt, *xmlNanoHTTPCtxtPtr;
static int initialized = 0;
static char *proxy = NULL; /* the proxy name if any */
static int proxyPort; /* the proxy port if any */
static unsigned int timeout = 60;/* the select() timeout in seconds */
static int xmlNanoHTTPFetchContent( void * ctx, char ** ptr, int * len );
/**
* xmlHTTPErrMemory:
* @extra: extra information
*
* Handle an out of memory condition
*/
static void
xmlHTTPErrMemory(void)
{
xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_HTTP, NULL);
}
/**
* A portability function
*/
static int socket_errno(void) {
#ifdef _WINSOCKAPI_
int err = WSAGetLastError();
switch(err) {
case WSAECONNRESET:
return(ECONNRESET);
case WSAEINPROGRESS:
return(EINPROGRESS);
case WSAEINTR:
return(EINTR);
case WSAESHUTDOWN:
return(ESHUTDOWN);
case WSAEWOULDBLOCK:
return(EWOULDBLOCK);
default:
return(err);
}
#else
return(errno);
#endif
}
/**
* xmlNanoHTTPInit:
*
* Initialize the HTTP protocol layer.
* Currently it just checks for proxy information
*/
void
xmlNanoHTTPInit(void) {
const char *env;
#ifdef _WINSOCKAPI_
WSADATA wsaData;
#endif
if (initialized)
return;
#ifdef _WINSOCKAPI_
if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0)
return;
#endif
if (proxy == NULL) {
proxyPort = 80;
env = getenv("no_proxy");
if (env && ((env[0] == '*') && (env[1] == 0)))
goto done;
env = getenv("http_proxy");
if (env != NULL) {
xmlNanoHTTPScanProxy(env);
goto done;
}
env = getenv("HTTP_PROXY");
if (env != NULL) {
xmlNanoHTTPScanProxy(env);
goto done;
}
}
done:
initialized = 1;
}
/**
* xmlNanoHTTPCleanup:
*
* Cleanup the HTTP protocol layer.
*/
void
xmlNanoHTTPCleanup(void) {
if (proxy != NULL) {
xmlFree(proxy);
proxy = NULL;
}
#ifdef _WINSOCKAPI_
if (initialized)
WSACleanup();
#endif
initialized = 0;
return;
}
/**
* xmlNanoHTTPScanURL:
* @ctxt: an HTTP context
* @URL: The URL used to initialize the context
*
* (Re)Initialize an HTTP context by parsing the URL and finding
* the protocol host port and path it indicates.
*/
static void
xmlNanoHTTPScanURL(xmlNanoHTTPCtxtPtr ctxt, const char *URL) {
xmlURIPtr uri;
int len;
/*
* Clear any existing data from the context
*/
if (ctxt->protocol != NULL) {
xmlFree(ctxt->protocol);
ctxt->protocol = NULL;
}
if (ctxt->hostname != NULL) {
xmlFree(ctxt->hostname);
ctxt->hostname = NULL;
}
if (ctxt->path != NULL) {
xmlFree(ctxt->path);
ctxt->path = NULL;
}
if (ctxt->query != NULL) {
xmlFree(ctxt->query);
ctxt->query = NULL;
}
if (URL == NULL) return;
uri = xmlParseURIRaw(URL, 1);
if (uri == NULL)
return;
if ((uri->scheme == NULL) || (uri->server == NULL)) {
xmlFreeURI(uri);
return;
}
ctxt->protocol = xmlMemStrdup(uri->scheme);
/* special case of IPv6 addresses, the [] need to be removed */
if ((uri->server != NULL) && (*uri->server == '[')) {
len = strlen(uri->server);
if ((len > 2) && (uri->server[len - 1] == ']')) {
ctxt->hostname = (char *) xmlCharStrndup(uri->server + 1, len -2);
} else
ctxt->hostname = xmlMemStrdup(uri->server);
} else
ctxt->hostname = xmlMemStrdup(uri->server);
if (uri->path != NULL)
ctxt->path = xmlMemStrdup(uri->path);
else
ctxt->path = xmlMemStrdup("/");
if (uri->query != NULL)
ctxt->query = xmlMemStrdup(uri->query);
if (uri->port != 0)
ctxt->port = uri->port;
xmlFreeURI(uri);
}
/**
* xmlNanoHTTPScanProxy:
* @URL: The proxy URL used to initialize the proxy context
*
* (Re)Initialize the HTTP Proxy context by parsing the URL and finding
* the protocol host port it indicates.
* Should be like http://myproxy/ or http://myproxy:3128/
* A NULL URL cleans up proxy information.
*/
void
xmlNanoHTTPScanProxy(const char *URL) {
xmlURIPtr uri;
if (proxy != NULL) {
xmlFree(proxy);
proxy = NULL;
}
proxyPort = 0;
if (URL == NULL) return;
uri = xmlParseURIRaw(URL, 1);
if ((uri == NULL) || (uri->scheme == NULL) ||
(strcmp(uri->scheme, "http")) || (uri->server == NULL)) {
__xmlIOErr(XML_FROM_HTTP, XML_HTTP_URL_SYNTAX, "Syntax Error\n");
if (uri != NULL)
xmlFreeURI(uri);
return;
}
proxy = xmlMemStrdup(uri->server);
if (uri->port != 0)
proxyPort = uri->port;
xmlFreeURI(uri);
}
/**
* xmlNanoHTTPNewCtxt:
* @URL: The URL used to initialize the context
*
* Allocate and initialize a new HTTP context.
*
* Returns an HTTP context or NULL in case of error.
*/
static xmlNanoHTTPCtxtPtr
xmlNanoHTTPNewCtxt(const char *URL) {
xmlNanoHTTPCtxtPtr ret;
ret = (xmlNanoHTTPCtxtPtr) xmlMalloc(sizeof(xmlNanoHTTPCtxt));
if (ret == NULL) {
xmlHTTPErrMemory();
return(NULL);
}
memset(ret, 0, sizeof(xmlNanoHTTPCtxt));
ret->port = 80;
ret->returnValue = 0;
ret->fd = INVALID_SOCKET;
ret->ContentLength = -1;
xmlNanoHTTPScanURL(ret, URL);
return(ret);
}
/**
* xmlNanoHTTPFreeCtxt:
* @ctxt: an HTTP context
*
* Frees the context after closing the connection.
*/
static void
xmlNanoHTTPFreeCtxt(xmlNanoHTTPCtxtPtr ctxt) {
if (ctxt == NULL) return;
if (ctxt->hostname != NULL) xmlFree(ctxt->hostname);
if (ctxt->protocol != NULL) xmlFree(ctxt->protocol);
if (ctxt->path != NULL) xmlFree(ctxt->path);
if (ctxt->query != NULL) xmlFree(ctxt->query);
if (ctxt->out != NULL) xmlFree(ctxt->out);
if (ctxt->in != NULL) xmlFree(ctxt->in);
if (ctxt->contentType != NULL) xmlFree(ctxt->contentType);
if (ctxt->encoding != NULL) xmlFree(ctxt->encoding);
if (ctxt->mimeType != NULL) xmlFree(ctxt->mimeType);
if (ctxt->location != NULL) xmlFree(ctxt->location);
if (ctxt->authHeader != NULL) xmlFree(ctxt->authHeader);
#ifdef LIBXML_ZLIB_ENABLED
if (ctxt->strm != NULL) {
inflateEnd(ctxt->strm);
xmlFree(ctxt->strm);
}
#endif
ctxt->state = XML_NANO_HTTP_NONE;
if (ctxt->fd != INVALID_SOCKET) closesocket(ctxt->fd);
ctxt->fd = INVALID_SOCKET;
xmlFree(ctxt);
}
/**
* xmlNanoHTTPSend:
* @ctxt: an HTTP context
*
* Send the input needed to initiate the processing on the server side
* Returns number of bytes sent or -1 on error.
*/
static int
xmlNanoHTTPSend(xmlNanoHTTPCtxtPtr ctxt, const char *xmt_ptr, int outlen)
{
int total_sent = 0;
#ifdef HAVE_POLL_H
struct pollfd p;
#else
struct timeval tv;
fd_set wfd;
#endif
if ((ctxt->state & XML_NANO_HTTP_WRITE) && (xmt_ptr != NULL)) {
while (total_sent < outlen) {
int nsent = send(ctxt->fd, SEND_ARG2_CAST (xmt_ptr + total_sent),
outlen - total_sent, 0);
if (nsent > 0)
total_sent += nsent;
else if ((nsent == -1) &&
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
(socket_errno() != EAGAIN) &&
#endif
(socket_errno() != EWOULDBLOCK)) {
__xmlIOErr(XML_FROM_HTTP, 0, "send failed\n");
if (total_sent == 0)
total_sent = -1;
break;
} else {
/*
* No data sent
* Since non-blocking sockets are used, wait for
* socket to be writable or default timeout prior
* to retrying.
*/
#ifndef HAVE_POLL_H
#ifndef _WINSOCKAPI_
if (ctxt->fd > FD_SETSIZE)
return -1;
#endif
tv.tv_sec = timeout;
tv.tv_usec = 0;
FD_ZERO(&wfd);
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4018)
#endif
FD_SET(ctxt->fd, &wfd);
#ifdef _MSC_VER
#pragma warning(pop)
#endif
(void) select(ctxt->fd + 1, NULL, &wfd, NULL, &tv);
#else
p.fd = ctxt->fd;
p.events = POLLOUT;
(void) poll(&p, 1, timeout * 1000);
#endif /* !HAVE_POLL_H */
}
}
}
return total_sent;
}
/**
* xmlNanoHTTPRecv:
* @ctxt: an HTTP context
*
* Read information coming from the HTTP connection.
* This is a blocking call (but it blocks in select(), not read()).
*
* Returns the number of byte read or -1 in case of error.
*/
static int
xmlNanoHTTPRecv(xmlNanoHTTPCtxtPtr ctxt)
{
#ifdef HAVE_POLL_H
struct pollfd p;
#else
fd_set rfd;
struct timeval tv;
#endif
while (ctxt->state & XML_NANO_HTTP_READ) {
if (ctxt->in == NULL) {
ctxt->in = (char *) xmlMallocAtomic(65000);
if (ctxt->in == NULL) {
xmlHTTPErrMemory();
ctxt->last = -1;
return (-1);
}
ctxt->inlen = 65000;
ctxt->inptr = ctxt->content = ctxt->inrptr = ctxt->in;
}
if (ctxt->inrptr > ctxt->in + XML_NANO_HTTP_CHUNK) {
int delta = ctxt->inrptr - ctxt->in;
int len = ctxt->inptr - ctxt->inrptr;
memmove(ctxt->in, ctxt->inrptr, len);
ctxt->inrptr -= delta;
ctxt->content -= delta;
ctxt->inptr -= delta;
}
if ((ctxt->in + ctxt->inlen) < (ctxt->inptr + XML_NANO_HTTP_CHUNK)) {
int d_inptr = ctxt->inptr - ctxt->in;
int d_content = ctxt->content - ctxt->in;
int d_inrptr = ctxt->inrptr - ctxt->in;
char *tmp_ptr = ctxt->in;
ctxt->inlen *= 2;
ctxt->in = (char *) xmlRealloc(tmp_ptr, ctxt->inlen);
if (ctxt->in == NULL) {
xmlHTTPErrMemory();
xmlFree(tmp_ptr);
ctxt->last = -1;
return (-1);
}
ctxt->inptr = ctxt->in + d_inptr;
ctxt->content = ctxt->in + d_content;
ctxt->inrptr = ctxt->in + d_inrptr;
}
ctxt->last = recv(ctxt->fd, ctxt->inptr, XML_NANO_HTTP_CHUNK, 0);
if (ctxt->last > 0) {
ctxt->inptr += ctxt->last;
return (ctxt->last);
}
if (ctxt->last == 0) {
return (0);
}
if (ctxt->last == -1) {
switch (socket_errno()) {
case EINPROGRESS:
case EWOULDBLOCK:
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
case EAGAIN:
#endif
break;
case ECONNRESET:
case ESHUTDOWN:
return (0);
default:
__xmlIOErr(XML_FROM_HTTP, 0, "recv failed\n");
return (-1);
}
}
#ifdef HAVE_POLL_H
p.fd = ctxt->fd;
p.events = POLLIN;
if ((poll(&p, 1, timeout * 1000) < 1)
#if defined(EINTR)
&& (errno != EINTR)
#endif
)
return (0);
#else /* !HAVE_POLL_H */
#ifndef _WINSOCKAPI_
if (ctxt->fd > FD_SETSIZE)
return 0;
#endif
tv.tv_sec = timeout;
tv.tv_usec = 0;
FD_ZERO(&rfd);
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4018)
#endif
FD_SET(ctxt->fd, &rfd);
#ifdef _MSC_VER
#pragma warning(pop)
#endif
if ((select(ctxt->fd + 1, &rfd, NULL, NULL, &tv) < 1)
#if defined(EINTR)
&& (socket_errno() != EINTR)
#endif
)
return (0);
#endif /* !HAVE_POLL_H */
}
return (0);
}
/**
* xmlNanoHTTPReadLine:
* @ctxt: an HTTP context
*
* Read one line in the HTTP server output, usually for extracting
* the HTTP protocol information from the answer header.
*
* Returns a newly allocated string with a copy of the line, or NULL
* which indicate the end of the input.
*/
static char *
xmlNanoHTTPReadLine(xmlNanoHTTPCtxtPtr ctxt) {
char buf[4096];
char *bp = buf;
int rc;
while (bp - buf < 4095) {
if (ctxt->inrptr == ctxt->inptr) {
if ( (rc = xmlNanoHTTPRecv(ctxt)) == 0) {
if (bp == buf)
return(NULL);
else
*bp = 0;
return(xmlMemStrdup(buf));
}
else if ( rc == -1 ) {
return ( NULL );
}
}
*bp = *ctxt->inrptr++;
if (*bp == '\n') {
*bp = 0;
return(xmlMemStrdup(buf));
}
if (*bp != '\r')
bp++;
}
buf[4095] = 0;
return(xmlMemStrdup(buf));
}
/**
* xmlNanoHTTPScanAnswer:
* @ctxt: an HTTP context
* @line: an HTTP header line
*
* Try to extract useful information from the server answer.
* We currently parse and process:
* - The HTTP revision/ return code
* - The Content-Type, Mime-Type and charset used
* - The Location for redirect processing.
*
* Returns -1 in case of failure, the file descriptor number otherwise
*/
static void
xmlNanoHTTPScanAnswer(xmlNanoHTTPCtxtPtr ctxt, const char *line) {
const char *cur = line;
if (line == NULL) return;
if (!strncmp(line, "HTTP/", 5)) {
int version = 0;
int ret = 0;
cur += 5;
while ((*cur >= '0') && (*cur <= '9')) {
version *= 10;
version += *cur - '0';
cur++;
}
if (*cur == '.') {
cur++;
if ((*cur >= '0') && (*cur <= '9')) {
version *= 10;
version += *cur - '0';
cur++;
}
while ((*cur >= '0') && (*cur <= '9'))
cur++;
} else
version *= 10;
if ((*cur != ' ') && (*cur != '\t')) return;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if ((*cur < '0') || (*cur > '9')) return;
while ((*cur >= '0') && (*cur <= '9')) {
ret *= 10;
ret += *cur - '0';
cur++;
}
if ((*cur != 0) && (*cur != ' ') && (*cur != '\t')) return;
ctxt->returnValue = ret;
ctxt->version = version;
} else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Content-Type:", 13)) {
const xmlChar *charset, *last, *mime;
cur += 13;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if (ctxt->contentType != NULL)
xmlFree(ctxt->contentType);
ctxt->contentType = xmlMemStrdup(cur);
mime = (const xmlChar *) cur;
last = mime;
while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
(*last != ';') && (*last != ','))
last++;
if (ctxt->mimeType != NULL)
xmlFree(ctxt->mimeType);
ctxt->mimeType = (char *) xmlStrndup(mime, last - mime);
charset = xmlStrstr(BAD_CAST ctxt->contentType, BAD_CAST "charset=");
if (charset != NULL) {
charset += 8;
last = charset;
while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
(*last != ';') && (*last != ','))
last++;
if (ctxt->encoding != NULL)
xmlFree(ctxt->encoding);
ctxt->encoding = (char *) xmlStrndup(charset, last - charset);
}
} else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"ContentType:", 12)) {
const xmlChar *charset, *last, *mime;
cur += 12;
if (ctxt->contentType != NULL) return;
while ((*cur == ' ') || (*cur == '\t')) cur++;
ctxt->contentType = xmlMemStrdup(cur);
mime = (const xmlChar *) cur;
last = mime;
while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
(*last != ';') && (*last != ','))
last++;
if (ctxt->mimeType != NULL)
xmlFree(ctxt->mimeType);
ctxt->mimeType = (char *) xmlStrndup(mime, last - mime);
charset = xmlStrstr(BAD_CAST ctxt->contentType, BAD_CAST "charset=");
if (charset != NULL) {
charset += 8;
last = charset;
while ((*last != 0) && (*last != ' ') && (*last != '\t') &&
(*last != ';') && (*last != ','))
last++;
if (ctxt->encoding != NULL)
xmlFree(ctxt->encoding);
ctxt->encoding = (char *) xmlStrndup(charset, last - charset);
}
} else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Location:", 9)) {
cur += 9;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if (ctxt->location != NULL)
xmlFree(ctxt->location);
if (*cur == '/') {
xmlChar *tmp_http = xmlStrdup(BAD_CAST "http://");
xmlChar *tmp_loc =
xmlStrcat(tmp_http, (const xmlChar *) ctxt->hostname);
ctxt->location =
(char *) xmlStrcat (tmp_loc, (const xmlChar *) cur);
} else {
ctxt->location = xmlMemStrdup(cur);
}
} else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"WWW-Authenticate:", 17)) {
cur += 17;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if (ctxt->authHeader != NULL)
xmlFree(ctxt->authHeader);
ctxt->authHeader = xmlMemStrdup(cur);
} else if (!xmlStrncasecmp(BAD_CAST line, BAD_CAST"Proxy-Authenticate:", 19)) {
cur += 19;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if (ctxt->authHeader != NULL)
xmlFree(ctxt->authHeader);
ctxt->authHeader = xmlMemStrdup(cur);
#ifdef LIBXML_ZLIB_ENABLED
} else if ( !xmlStrncasecmp( BAD_CAST line, BAD_CAST"Content-Encoding:", 17) ) {
cur += 17;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if ( !xmlStrncasecmp( BAD_CAST cur, BAD_CAST"gzip", 4) ) {
ctxt->usesGzip = 1;
ctxt->strm = xmlMalloc(sizeof(z_stream));
if (ctxt->strm != NULL) {
ctxt->strm->zalloc = Z_NULL;
ctxt->strm->zfree = Z_NULL;
ctxt->strm->opaque = Z_NULL;
ctxt->strm->avail_in = 0;
ctxt->strm->next_in = Z_NULL;
inflateInit2( ctxt->strm, 31 );
}
}
#endif
} else if ( !xmlStrncasecmp( BAD_CAST line, BAD_CAST"Content-Length:", 15) ) {
cur += 15;
ctxt->ContentLength = strtol( cur, NULL, 10 );
}
}
/**
* xmlNanoHTTPConnectAttempt:
* @addr: a socket address structure
*
* Attempt a connection to the given IP:port endpoint. It forces
* non-blocking semantic on the socket, and allow 60 seconds for
* the host to answer.
*
* Returns -1 in case of failure, the file descriptor number otherwise
*/
static SOCKET
xmlNanoHTTPConnectAttempt(struct sockaddr *addr)
{
#ifndef HAVE_POLL_H
fd_set wfd;
#ifdef _WINSOCKAPI_
fd_set xfd;
#endif
struct timeval tv;
#else /* !HAVE_POLL_H */
struct pollfd p;
#endif /* !HAVE_POLL_H */
int status;
int addrlen;
SOCKET s;
#ifdef SUPPORT_IP6
if (addr->sa_family == AF_INET6) {
s = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP);
addrlen = sizeof(struct sockaddr_in6);
} else
#endif
{
s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
addrlen = sizeof(struct sockaddr_in);
}
if (s == INVALID_SOCKET) {
__xmlIOErr(XML_FROM_HTTP, 0, "socket failed\n");
return INVALID_SOCKET;
}
#ifdef _WINSOCKAPI_
{
u_long one = 1;
status = ioctlsocket(s, FIONBIO, &one) == SOCKET_ERROR ? -1 : 0;
}
#else /* _WINSOCKAPI_ */
#if defined(VMS)
{
int enable = 1;
status = ioctl(s, FIONBIO, &enable);
}
#else /* VMS */
if ((status = fcntl(s, F_GETFL, 0)) != -1) {
#ifdef O_NONBLOCK
status |= O_NONBLOCK;
#else /* O_NONBLOCK */
#ifdef F_NDELAY
status |= F_NDELAY;
#endif /* F_NDELAY */
#endif /* !O_NONBLOCK */
status = fcntl(s, F_SETFL, status);
}
if (status < 0) {
__xmlIOErr(XML_FROM_HTTP, 0, "error setting non-blocking IO\n");
closesocket(s);
return INVALID_SOCKET;
}
#endif /* !VMS */
#endif /* !_WINSOCKAPI_ */
if (connect(s, addr, addrlen) == -1) {
switch (socket_errno()) {
case EINPROGRESS:
case EWOULDBLOCK:
break;
default:
__xmlIOErr(XML_FROM_HTTP, 0,
"error connecting to HTTP server");
closesocket(s);
return INVALID_SOCKET;
}
}
#ifndef HAVE_POLL_H
tv.tv_sec = timeout;
tv.tv_usec = 0;
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4018)
#endif
#ifndef _WINSOCKAPI_
if (s > FD_SETSIZE)
return INVALID_SOCKET;
#endif
FD_ZERO(&wfd);
FD_SET(s, &wfd);
#ifdef _WINSOCKAPI_
FD_ZERO(&xfd);
FD_SET(s, &xfd);
switch (select(s + 1, NULL, &wfd, &xfd, &tv))
#else
switch (select(s + 1, NULL, &wfd, NULL, &tv))
#endif
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#else /* !HAVE_POLL_H */
p.fd = s;
p.events = POLLOUT;
switch (poll(&p, 1, timeout * 1000))
#endif /* !HAVE_POLL_H */
{
case 0:
/* Time out */
__xmlIOErr(XML_FROM_HTTP, 0, "Connect attempt timed out");
closesocket(s);
return INVALID_SOCKET;
case -1:
/* Ermm.. ?? */
__xmlIOErr(XML_FROM_HTTP, 0, "Connect failed");
closesocket(s);
return INVALID_SOCKET;
}
#ifndef HAVE_POLL_H
if (FD_ISSET(s, &wfd)
#ifdef _WINSOCKAPI_
|| FD_ISSET(s, &xfd)
#endif
)
#else /* !HAVE_POLL_H */
if (p.revents == POLLOUT)
#endif /* !HAVE_POLL_H */
{
XML_SOCKLEN_T len;
len = sizeof(status);
#ifdef SO_ERROR
if (getsockopt(s, SOL_SOCKET, SO_ERROR, (char *) &status, &len) <
0) {
/* Solaris error code */
__xmlIOErr(XML_FROM_HTTP, 0, "getsockopt failed\n");
closesocket(s);
return INVALID_SOCKET;
}
#endif
if (status) {
__xmlIOErr(XML_FROM_HTTP, 0,
"Error connecting to remote host");
closesocket(s);
errno = status;
return INVALID_SOCKET;
}
} else {
/* pbm */
__xmlIOErr(XML_FROM_HTTP, 0, "select failed\n");
closesocket(s);
return INVALID_SOCKET;
}
return (s);
}
/**
* xmlNanoHTTPConnectHost:
* @host: the host name
* @port: the port number
*
* Attempt a connection to the given host:port endpoint. It tries
* the multiple IP provided by the DNS if available.
*
* Returns -1 in case of failure, the file descriptor number otherwise
*/
static SOCKET
xmlNanoHTTPConnectHost(const char *host, int port)
{
struct sockaddr *addr = NULL;
struct sockaddr_in sockin;
#ifdef SUPPORT_IP6
struct sockaddr_in6 sockin6;
#endif
SOCKET s;
memset (&sockin, 0, sizeof(sockin));
#if defined(SUPPORT_IP6)
{
int status;
struct addrinfo hints, *res, *result;
memset (&sockin6, 0, sizeof(sockin6));
result = NULL;
memset (&hints, 0,sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
status = getaddrinfo (host, NULL, &hints, &result);
if (status) {
__xmlIOErr(XML_FROM_HTTP, 0, "getaddrinfo failed\n");
return INVALID_SOCKET;
}
for (res = result; res; res = res->ai_next) {
if (res->ai_family == AF_INET) {
if ((size_t)res->ai_addrlen > sizeof(sockin)) {
__xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
freeaddrinfo (result);
return INVALID_SOCKET;
}
memcpy (&sockin, res->ai_addr, res->ai_addrlen);
sockin.sin_port = htons (port);
addr = (struct sockaddr *)&sockin;
} else if (res->ai_family == AF_INET6) {
if ((size_t)res->ai_addrlen > sizeof(sockin6)) {
__xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
freeaddrinfo (result);
return INVALID_SOCKET;
}
memcpy (&sockin6, res->ai_addr, res->ai_addrlen);
sockin6.sin6_port = htons (port);
addr = (struct sockaddr *)&sockin6;
} else
continue; /* for */
s = xmlNanoHTTPConnectAttempt (addr);
if (s != INVALID_SOCKET) {
freeaddrinfo (result);
return (s);
}
}
if (result)
freeaddrinfo (result);
}
#else
{
struct hostent *h;
struct in_addr ia;
int i;
h = gethostbyname (GETHOSTBYNAME_ARG_CAST host);
if (h == NULL) {
/*
* Okay, I got fed up by the non-portability of this error message
* extraction code. it work on Linux, if it work on your platform
* and one want to enable it, send me the defined(foobar) needed
*/
#if defined(HAVE_NETDB_H) && defined(HOST_NOT_FOUND) && defined(__linux__)
const char *h_err_txt = "";
switch (h_errno) {
case HOST_NOT_FOUND:
h_err_txt = "Authoritative host not found";
break;
case TRY_AGAIN:
h_err_txt =
"Non-authoritative host not found or server failure.";
break;
case NO_RECOVERY:
h_err_txt =
"Non-recoverable errors: FORMERR, REFUSED, or NOTIMP.";
break;
#ifdef NO_ADDRESS
case NO_ADDRESS:
h_err_txt =
"Valid name, no data record of requested type.";
break;
#endif
default:
h_err_txt = "No error text defined.";
break;
}
__xmlIOErr(XML_FROM_HTTP, 0, h_err_txt);
#else
__xmlIOErr(XML_FROM_HTTP, 0, "Failed to resolve host");
#endif
return INVALID_SOCKET;
}
for (i = 0; h->h_addr_list[i]; i++) {
if (h->h_addrtype == AF_INET) {
/* A records (IPv4) */
if ((unsigned int) h->h_length > sizeof(ia)) {
__xmlIOErr(XML_FROM_HTTP, 0, "address size mismatch\n");
return INVALID_SOCKET;
}
memcpy (&ia, h->h_addr_list[i], h->h_length);
sockin.sin_family = h->h_addrtype;
sockin.sin_addr = ia;
sockin.sin_port = (unsigned short)htons ((unsigned short)port);
addr = (struct sockaddr *) &sockin;
} else
break; /* for */
s = xmlNanoHTTPConnectAttempt (addr);
if (s != INVALID_SOCKET)
return (s);
}
}
#endif
return INVALID_SOCKET;
}
/**
* xmlNanoHTTPOpen:
* @URL: The URL to load
* @contentType: if available the Content-Type information will be
* returned at that location
*
* This function try to open a connection to the indicated resource
* via HTTP GET.
*
* Returns NULL in case of failure, otherwise a request handler.
* The contentType, if provided must be freed by the caller
*/
void*
xmlNanoHTTPOpen(const char *URL, char **contentType) {
if (contentType != NULL) *contentType = NULL;
return(xmlNanoHTTPMethod(URL, NULL, NULL, contentType, NULL, 0));
}
/**
* xmlNanoHTTPOpenRedir:
* @URL: The URL to load
* @contentType: if available the Content-Type information will be
* returned at that location
* @redir: if available the redirected URL will be returned
*
* This function try to open a connection to the indicated resource
* via HTTP GET.
*
* Returns NULL in case of failure, otherwise a request handler.
* The contentType, if provided must be freed by the caller
*/
void*
xmlNanoHTTPOpenRedir(const char *URL, char **contentType, char **redir) {
if (contentType != NULL) *contentType = NULL;
if (redir != NULL) *redir = NULL;
return(xmlNanoHTTPMethodRedir(URL, NULL, NULL, contentType, redir, NULL,0));
}
/**
* xmlNanoHTTPRead:
* @ctx: the HTTP context
* @dest: a buffer
* @len: the buffer length
*
* This function tries to read @len bytes from the existing HTTP connection
* and saves them in @dest. This is a blocking call.
*
* Returns the number of byte read. 0 is an indication of an end of connection.
* -1 indicates a parameter error.
*/
int
xmlNanoHTTPRead(void *ctx, void *dest, int len) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
#ifdef LIBXML_ZLIB_ENABLED
int bytes_read = 0;
int orig_avail_in;
int z_ret;
#endif
if (ctx == NULL) return(-1);
if (dest == NULL) return(-1);
if (len <= 0) return(0);
#ifdef LIBXML_ZLIB_ENABLED
if (ctxt->usesGzip == 1) {
if (ctxt->strm == NULL) return(0);
ctxt->strm->next_out = dest;
ctxt->strm->avail_out = len;
ctxt->strm->avail_in = ctxt->inptr - ctxt->inrptr;
while (ctxt->strm->avail_out > 0 &&
(ctxt->strm->avail_in > 0 || xmlNanoHTTPRecv(ctxt) > 0)) {
orig_avail_in = ctxt->strm->avail_in =
ctxt->inptr - ctxt->inrptr - bytes_read;
ctxt->strm->next_in = BAD_CAST (ctxt->inrptr + bytes_read);
z_ret = inflate(ctxt->strm, Z_NO_FLUSH);
bytes_read += orig_avail_in - ctxt->strm->avail_in;
if (z_ret != Z_OK) break;
}
ctxt->inrptr += bytes_read;
return(len - ctxt->strm->avail_out);
}
#endif
while (ctxt->inptr - ctxt->inrptr < len) {
if (xmlNanoHTTPRecv(ctxt) <= 0) break;
}
if (ctxt->inptr - ctxt->inrptr < len)
len = ctxt->inptr - ctxt->inrptr;
if (len > 0) {
memcpy(dest, ctxt->inrptr, len);
ctxt->inrptr += len;
}
return(len);
}
/**
* xmlNanoHTTPClose:
* @ctx: the HTTP context
*
* This function closes an HTTP context, it ends up the connection and
* free all data related to it.
*/
void
xmlNanoHTTPClose(void *ctx) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
if (ctx == NULL) return;
xmlNanoHTTPFreeCtxt(ctxt);
}
/**
* xmlNanoHTTPHostnameMatch:
* @pattern: The pattern as it appears in no_proxy environment variable
* @hostname: The hostname to test as it appears in the URL
*
* This function tests whether a given hostname matches a pattern. The pattern
* usually is a token from the no_proxy environment variable. Wildcards in the
* pattern are not supported.
*
* Returns true, iff hostname matches the pattern.
*/
static int
xmlNanoHTTPHostnameMatch(const char *pattern, const char *hostname) {
int idx_pattern, idx_hostname;
const char * pattern_start;
if (!pattern || *pattern == '\0' || !hostname)
return 0;
/* Ignore trailing '.' */
if (*pattern == '.') {
idx_pattern = strlen(pattern) -1;
pattern_start = pattern + 1;
}
else {
idx_pattern = strlen(pattern);
pattern_start = pattern;
}
idx_hostname = strlen(hostname);
for (; idx_pattern >= 0 && idx_hostname >= 0;
--idx_pattern, --idx_hostname) {
if (tolower(pattern_start[idx_pattern]) != tolower(hostname[idx_hostname]))
break;
}
return idx_pattern == -1 && (idx_hostname == -1|| hostname[idx_hostname] == '.');
}
/**
* xmlNanoHTTPBypassProxy:
* @hostname: The hostname as it appears in the URL
*
* This function evaluates the no_proxy environment variable and returns
* whether the proxy server should be bypassed for a given host.
*
* Returns true, iff a proxy server should be bypassed for the given hostname.
*/
static int
xmlNanoHTTPBypassProxy(const char *hostname) {
size_t envlen;
char *env = getenv("no_proxy"), *cpy=NULL, *p=NULL;
if (!env)
return 0;
/* (Avoid strdup because it's not portable.) */
envlen = strlen(env) + 1;
cpy = xmlMalloc(envlen);
memcpy(cpy, env, envlen);
env = cpy;
/* The remainder of the function is basically a tokenizing: */
while (isspace(*env))
++env;
if (*env == '\0') {
xmlFree(cpy);
return 0;
}
p = env;
while (*env) {
if (*env != ',') {
++env;
continue;
}
*(env++) = '\0';
if (xmlNanoHTTPHostnameMatch(p, hostname)) {
xmlFree(cpy);
return 1;
}
while (isspace(*env))
++env;
p = env;
}
if (xmlNanoHTTPHostnameMatch(p, hostname)) {
xmlFree(cpy);
return 1;
}
xmlFree(cpy);
return 0;
}
/**
* xmlNanoHTTPMethodRedir:
* @URL: The URL to load
* @method: the HTTP method to use
* @input: the input string if any
* @contentType: the Content-Type information IN and OUT
* @redir: the redirected URL OUT
* @headers: the extra headers
* @ilen: input length
*
* This function try to open a connection to the indicated resource
* via HTTP using the given @method, adding the given extra headers
* and the input buffer for the request content.
*
* Returns NULL in case of failure, otherwise a request handler.
* The contentType, or redir, if provided must be freed by the caller
*/
void*
xmlNanoHTTPMethodRedir(const char *URL, const char *method, const char *input,
char **contentType, char **redir,
const char *headers, int ilen ) {
xmlNanoHTTPCtxtPtr ctxt;
char *bp, *p;
int blen;
SOCKET ret;
int nbRedirects = 0;
int use_proxy;
char *redirURL = NULL;
if (URL == NULL) return(NULL);
if (method == NULL) method = "GET";
xmlNanoHTTPInit();
retry:
if (redirURL == NULL) {
ctxt = xmlNanoHTTPNewCtxt(URL);
if (ctxt == NULL)
return(NULL);
} else {
ctxt = xmlNanoHTTPNewCtxt(redirURL);
if (ctxt == NULL)
return(NULL);
ctxt->location = xmlMemStrdup(redirURL);
}
if ((ctxt->protocol == NULL) || (strcmp(ctxt->protocol, "http"))) {
__xmlIOErr(XML_FROM_IO, XML_IO_UNSUPPORTED_PROTOCOL, ctxt->protocol);
xmlNanoHTTPFreeCtxt(ctxt);
if (redirURL != NULL) xmlFree(redirURL);
return(NULL);
}
if (ctxt->hostname == NULL) {
__xmlIOErr(XML_FROM_HTTP, XML_HTTP_UNKNOWN_HOST,
"Failed to identify host in URI");
xmlNanoHTTPFreeCtxt(ctxt);
if (redirURL != NULL) xmlFree(redirURL);
return(NULL);
}
use_proxy = proxy && !xmlNanoHTTPBypassProxy(ctxt->hostname);
if (use_proxy) {
blen = strlen(ctxt->hostname) * 2 + 16;
ret = xmlNanoHTTPConnectHost(proxy, proxyPort);
}
else {
blen = strlen(ctxt->hostname);
ret = xmlNanoHTTPConnectHost(ctxt->hostname, ctxt->port);
}
if (ret == INVALID_SOCKET) {
xmlNanoHTTPFreeCtxt(ctxt);
if (redirURL != NULL) xmlFree(redirURL);
return(NULL);
}
ctxt->fd = ret;
if (input == NULL)
ilen = 0;
else
blen += 36;
if (headers != NULL)
blen += strlen(headers) + 2;
if (contentType && *contentType)
/* reserve for string plus 'Content-Type: \r\n" */
blen += strlen(*contentType) + 16;
if (ctxt->query != NULL)
/* 1 for '?' */
blen += strlen(ctxt->query) + 1;
blen += strlen(method) + strlen(ctxt->path) + 24;
#ifdef LIBXML_ZLIB_ENABLED
/* reserve for possible 'Accept-Encoding: gzip' string */
blen += 23;
#endif
if (ctxt->port != 80) {
/* reserve space for ':xxxxx', incl. potential proxy */
if (use_proxy)
blen += 17;
else
blen += 11;
}
bp = (char*)xmlMallocAtomic(blen);
if ( bp == NULL ) {
xmlNanoHTTPFreeCtxt( ctxt );
xmlHTTPErrMemory();
return ( NULL );
}
p = bp;
if (use_proxy) {
if (ctxt->port != 80) {
p += snprintf( p, blen - (p - bp), "%s http://%s:%d%s",
method, ctxt->hostname,
ctxt->port, ctxt->path );
}
else
p += snprintf( p, blen - (p - bp), "%s http://%s%s", method,
ctxt->hostname, ctxt->path);
}
else
p += snprintf( p, blen - (p - bp), "%s %s", method, ctxt->path);
if (ctxt->query != NULL)
p += snprintf( p, blen - (p - bp), "?%s", ctxt->query);
if (ctxt->port == 80) {
p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s\r\n",
ctxt->hostname);
} else {
p += snprintf( p, blen - (p - bp), " HTTP/1.0\r\nHost: %s:%d\r\n",
ctxt->hostname, ctxt->port);
}
#ifdef LIBXML_ZLIB_ENABLED
p += snprintf(p, blen - (p - bp), "Accept-Encoding: gzip\r\n");
#endif
if (contentType != NULL && *contentType)
p += snprintf(p, blen - (p - bp), "Content-Type: %s\r\n", *contentType);
if (headers != NULL)
p += snprintf( p, blen - (p - bp), "%s", headers );
if (input != NULL)
snprintf(p, blen - (p - bp), "Content-Length: %d\r\n\r\n", ilen );
else
snprintf(p, blen - (p - bp), "\r\n");
ctxt->outptr = ctxt->out = bp;
ctxt->state = XML_NANO_HTTP_WRITE;
blen = strlen( ctxt->out );
xmlNanoHTTPSend(ctxt, ctxt->out, blen );
if ( input != NULL ) {
xmlNanoHTTPSend( ctxt, input, ilen );
}
ctxt->state = XML_NANO_HTTP_READ;
while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
if (*p == 0) {
ctxt->content = ctxt->inrptr;
xmlFree(p);
break;
}
xmlNanoHTTPScanAnswer(ctxt, p);
xmlFree(p);
}
if ((ctxt->location != NULL) && (ctxt->returnValue >= 300) &&
(ctxt->returnValue < 400)) {
while ( xmlNanoHTTPRecv(ctxt) > 0 )
;
if (nbRedirects < XML_NANO_HTTP_MAX_REDIR) {
nbRedirects++;
if (redirURL != NULL)
xmlFree(redirURL);
redirURL = xmlMemStrdup(ctxt->location);
xmlNanoHTTPFreeCtxt(ctxt);
goto retry;
}
xmlNanoHTTPFreeCtxt(ctxt);
if (redirURL != NULL) xmlFree(redirURL);
return(NULL);
}
if (contentType != NULL) {
if (ctxt->contentType != NULL)
*contentType = xmlMemStrdup(ctxt->contentType);
else
*contentType = NULL;
}
if ((redir != NULL) && (redirURL != NULL)) {
*redir = redirURL;
} else {
if (redirURL != NULL)
xmlFree(redirURL);
if (redir != NULL)
*redir = NULL;
}
return((void *) ctxt);
}
/**
* xmlNanoHTTPMethod:
* @URL: The URL to load
* @method: the HTTP method to use
* @input: the input string if any
* @contentType: the Content-Type information IN and OUT
* @headers: the extra headers
* @ilen: input length
*
* This function try to open a connection to the indicated resource
* via HTTP using the given @method, adding the given extra headers
* and the input buffer for the request content.
*
* Returns NULL in case of failure, otherwise a request handler.
* The contentType, if provided must be freed by the caller
*/
void*
xmlNanoHTTPMethod(const char *URL, const char *method, const char *input,
char **contentType, const char *headers, int ilen) {
return(xmlNanoHTTPMethodRedir(URL, method, input, contentType,
NULL, headers, ilen));
}
/**
* xmlNanoHTTPFetch:
* @URL: The URL to load
* @filename: the filename where the content should be saved
* @contentType: if available the Content-Type information will be
* returned at that location
*
* This function try to fetch the indicated resource via HTTP GET
* and save it's content in the file.
*
* Returns -1 in case of failure, 0 in case of success. The contentType,
* if provided must be freed by the caller
*/
int
xmlNanoHTTPFetch(const char *URL, const char *filename, char **contentType) {
void *ctxt = NULL;
char *buf = NULL;
int fd;
int len;
int ret = 0;
if (filename == NULL) return(-1);
ctxt = xmlNanoHTTPOpen(URL, contentType);
if (ctxt == NULL) return(-1);
if (!strcmp(filename, "-"))
fd = 0;
else {
fd = open(filename, O_CREAT | O_WRONLY, 00644);
if (fd < 0) {
xmlNanoHTTPClose(ctxt);
if ((contentType != NULL) && (*contentType != NULL)) {
xmlFree(*contentType);
*contentType = NULL;
}
return(-1);
}
}
xmlNanoHTTPFetchContent( ctxt, &buf, &len );
if ( len > 0 ) {
if (write(fd, buf, len) == -1) {
ret = -1;
}
}
xmlNanoHTTPClose(ctxt);
close(fd);
return(ret);
}
#ifdef LIBXML_OUTPUT_ENABLED
/**
* xmlNanoHTTPSave:
* @ctxt: the HTTP context
* @filename: the filename where the content should be saved
*
* This function saves the output of the HTTP transaction to a file
* It closes and free the context at the end
*
* Returns -1 in case of failure, 0 in case of success.
*/
int
xmlNanoHTTPSave(void *ctxt, const char *filename) {
char *buf = NULL;
int fd;
int len;
int ret = 0;
if ((ctxt == NULL) || (filename == NULL)) return(-1);
if (!strcmp(filename, "-"))
fd = 0;
else {
fd = open(filename, O_CREAT | O_WRONLY, 0666);
if (fd < 0) {
xmlNanoHTTPClose(ctxt);
return(-1);
}
}
xmlNanoHTTPFetchContent( ctxt, &buf, &len );
if ( len > 0 ) {
if (write(fd, buf, len) == -1) {
ret = -1;
}
}
xmlNanoHTTPClose(ctxt);
close(fd);
return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */
/**
* xmlNanoHTTPReturnCode:
* @ctx: the HTTP context
*
* Get the latest HTTP return code received
*
* Returns the HTTP return code for the request.
*/
int
xmlNanoHTTPReturnCode(void *ctx) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
if (ctxt == NULL) return(-1);
return(ctxt->returnValue);
}
/**
* xmlNanoHTTPAuthHeader:
* @ctx: the HTTP context
*
* Get the authentication header of an HTTP context
*
* Returns the stashed value of the WWW-Authenticate or Proxy-Authenticate
* header.
*/
const char *
xmlNanoHTTPAuthHeader(void *ctx) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
if (ctxt == NULL) return(NULL);
return(ctxt->authHeader);
}
/**
* xmlNanoHTTPContentLength:
* @ctx: the HTTP context
*
* Provides the specified content length from the HTTP header.
*
* Return the specified content length from the HTTP header. Note that
* a value of -1 indicates that the content length element was not included in
* the response header.
*/
int
xmlNanoHTTPContentLength( void * ctx ) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr)ctx;
return ( ( ctxt == NULL ) ? -1 : ctxt->ContentLength );
}
/**
* xmlNanoHTTPRedir:
* @ctx: the HTTP context
*
* Provides the specified redirection URL if available from the HTTP header.
*
* Return the specified redirection URL or NULL if not redirected.
*/
const char *
xmlNanoHTTPRedir( void * ctx ) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr)ctx;
return ( ( ctxt == NULL ) ? NULL : ctxt->location );
}
/**
* xmlNanoHTTPEncoding:
* @ctx: the HTTP context
*
* Provides the specified encoding if specified in the HTTP headers.
*
* Return the specified encoding or NULL if not available
*/
const char *
xmlNanoHTTPEncoding( void * ctx ) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr)ctx;
return ( ( ctxt == NULL ) ? NULL : ctxt->encoding );
}
/**
* xmlNanoHTTPMimeType:
* @ctx: the HTTP context
*
* Provides the specified Mime-Type if specified in the HTTP headers.
*
* Return the specified Mime-Type or NULL if not available
*/
const char *
xmlNanoHTTPMimeType( void * ctx ) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr)ctx;
return ( ( ctxt == NULL ) ? NULL : ctxt->mimeType );
}
/**
* xmlNanoHTTPFetchContent:
* @ctx: the HTTP context
* @ptr: pointer to set to the content buffer.
* @len: integer pointer to hold the length of the content
*
* Check if all the content was read
*
* Returns 0 if all the content was read and available, returns
* -1 if received content length was less than specified or an error
* occurred.
*/
static int
xmlNanoHTTPFetchContent( void * ctx, char ** ptr, int * len ) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr)ctx;
int rc = 0;
int cur_lgth;
int rcvd_lgth;
int dummy_int;
char * dummy_ptr = NULL;
/* Dummy up return input parameters if not provided */
if ( len == NULL )
len = &dummy_int;
if ( ptr == NULL )
ptr = &dummy_ptr;
/* But can't work without the context pointer */
if ( ( ctxt == NULL ) || ( ctxt->content == NULL ) ) {
*len = 0;
*ptr = NULL;
return ( -1 );
}
rcvd_lgth = ctxt->inptr - ctxt->content;
while ( (cur_lgth = xmlNanoHTTPRecv( ctxt )) > 0 ) {
rcvd_lgth += cur_lgth;
if ( (ctxt->ContentLength > 0) && (rcvd_lgth >= ctxt->ContentLength) )
break;
}
*ptr = ctxt->content;
*len = rcvd_lgth;
if ( ( ctxt->ContentLength > 0 ) && ( rcvd_lgth < ctxt->ContentLength ) )
rc = -1;
else if ( rcvd_lgth == 0 )
rc = -1;
return ( rc );
}
#ifdef STANDALONE
int main(int argc, char **argv) {
char *contentType = NULL;
if (argv[1] != NULL) {
if (argv[2] != NULL)
xmlNanoHTTPFetch(argv[1], argv[2], &contentType);
else
xmlNanoHTTPFetch(argv[1], "-", &contentType);
if (contentType != NULL) xmlFree(contentType);
} else {
fprintf(stderr,
"%s: minimal HTTP GET implementation\n", argv[0]);
fprintf(stderr,
"\tusage %s [ URL [ filename ] ]\n", argv[0]);
}
xmlNanoHTTPCleanup();
return(0);
}
#endif /* STANDALONE */
#else /* !LIBXML_HTTP_ENABLED */
#ifdef STANDALONE
#include <stdio.h>
int main(int argc, char **argv) {
fprintf(stderr,
"%s : HTTP support not compiled in\n", argv[0]);
return(0);
}
#endif /* STANDALONE */
#endif /* LIBXML_HTTP_ENABLED */
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