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libxml2/nanohttp.c
Chun-wei Fan cfbe68e468 sources: Silence C4013 warnings on Visual Studio 
The read(), close(), open(), lseek() functions are found in io.h on Visual
Studio, which does not ship unistd.h, so include io.h on Windows if unistd.h
is not found.

C4013 (aka implicit declaration of ...) warnings can often ring alarm bells.
2022-11-22 15:20:53 +08:00

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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/globals.h>
#include <libxml/xmlerror.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h> /* for xmlStr(n)casecmp() */
#include <libxml/nanohttp.h>
#include <libxml/globals.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 DEBUG_HTTP
#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
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(const char *extra)
{
__xmlSimpleError(XML_FROM_HTTP, XML_ERR_NO_MEMORY, NULL, NULL, extra);
}
/**
* 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;
#ifdef DEBUG_HTTP
if (URL == NULL)
xmlGenericError(xmlGenericErrorContext,
"Removing HTTP proxy info\n");
else
xmlGenericError(xmlGenericErrorContext,
"Using HTTP proxy %s\n", URL);
#endif
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("allocating context");
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("allocating input");
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("allocating input buffer");
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) {
#ifdef DEBUG_HTTP
perror("socket");
#endif
__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) {
#ifdef DEBUG_HTTP
perror("nonblocking");
#endif
__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
#ifdef DEBUG_HTTP
xmlGenericError(xmlGenericErrorContext,
"xmlNanoHTTPConnectHost: unable to connect to '%s'.\n",
host);
#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;
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;
#ifdef DEBUG_HTTP
int xmt_bytes;
#endif
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_HTTP, XML_HTTP_URL_SYNTAX, "Not a valid HTTP URI");
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("allocating header buffer");
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");
#ifdef DEBUG_HTTP
xmlGenericError(xmlGenericErrorContext,
"-> %s%s", use_proxy ? "(Proxy) " : "", bp);
if ((blen -= strlen(bp)+1) < 0)
xmlGenericError(xmlGenericErrorContext,
"ERROR: overflowed buffer by %d bytes\n", -blen);
#endif
ctxt->outptr = ctxt->out = bp;
ctxt->state = XML_NANO_HTTP_WRITE;
blen = strlen( ctxt->out );
#ifdef DEBUG_HTTP
xmt_bytes = xmlNanoHTTPSend(ctxt, ctxt->out, blen );
if ( xmt_bytes != blen )
xmlGenericError( xmlGenericErrorContext,
"xmlNanoHTTPMethodRedir: Only %d of %d %s %s\n",
xmt_bytes, blen,
"bytes of HTTP headers sent to host",
ctxt->hostname );
#else
xmlNanoHTTPSend(ctxt, ctxt->out, blen );
#endif
if ( input != NULL ) {
#ifdef DEBUG_HTTP
xmt_bytes = xmlNanoHTTPSend( ctxt, input, ilen );
if ( xmt_bytes != ilen )
xmlGenericError( xmlGenericErrorContext,
"xmlNanoHTTPMethodRedir: Only %d of %d %s %s\n",
xmt_bytes, ilen,
"bytes of HTTP content sent to host",
ctxt->hostname );
#else
xmlNanoHTTPSend( ctxt, input, ilen );
#endif
}
ctxt->state = XML_NANO_HTTP_READ;
while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
if (*p == 0) {
ctxt->content = ctxt->inrptr;
xmlFree(p);
break;
}
xmlNanoHTTPScanAnswer(ctxt, p);
#ifdef DEBUG_HTTP
xmlGenericError(xmlGenericErrorContext, "<- %s\n", p);
#endif
xmlFree(p);
}
if ((ctxt->location != NULL) && (ctxt->returnValue >= 300) &&
(ctxt->returnValue < 400)) {
#ifdef DEBUG_HTTP
xmlGenericError(xmlGenericErrorContext,
"\nRedirect to: %s\n", ctxt->location);
#endif
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);
#ifdef DEBUG_HTTP
xmlGenericError(xmlGenericErrorContext,
"xmlNanoHTTPMethodRedir: Too many redirects, aborting ...\n");
#endif
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;
}
#ifdef DEBUG_HTTP
if (ctxt->contentType != NULL)
xmlGenericError(xmlGenericErrorContext,
"\nCode %d, content-type '%s'\n\n",
ctxt->returnValue, ctxt->contentType);
else
xmlGenericError(xmlGenericErrorContext,
"\nCode %d, no content-type\n\n",
ctxt->returnValue);
#endif
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 {
xmlGenericError(xmlGenericErrorContext,
"%s: minimal HTTP GET implementation\n", argv[0]);
xmlGenericError(xmlGenericErrorContext,
"\tusage %s [ URL [ filename ] ]\n", argv[0]);
}
xmlNanoHTTPCleanup();
xmlMemoryDump();
return(0);
}
#endif /* STANDALONE */
#else /* !LIBXML_HTTP_ENABLED */
#ifdef STANDALONE
#include <stdio.h>
int main(int argc, char **argv) {
xmlGenericError(xmlGenericErrorContext,
"%s : HTTP support not compiled in\n", argv[0]);
return(0);
}
#endif /* STANDALONE */
#endif /* LIBXML_HTTP_ENABLED */
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