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libxml2/nanohttp.c
Daniel Veillard 06047432eb removed extraneous xmlRemoveProp definition added item about 
* tree.h: removed extraneous xmlRemoveProp definition
* TODO: added item about --disable-corba configure switch
* tree.c parser.c: fixed problems for xmlCopyDoc and postvalidation
* nanoftp.c: fixed include problems giving troubles on AIX and
  slowlaris
* xmlIO.[ch] valid.h tree.[ch] xlink.c xmlmemory.c uri.c
  parser.c nanoftp.c nanohttp.c SAX.c testSAX.c :
  comment and headers changes to lower gtk-doc number of warnings
* doc/html/*: rebuilt docs
Daniel
2000-04-24 11:33:38 +00:00

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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@w3.org
*/
/* TODO add compression support, Send the Accept- , and decompress on the
fly with ZLIB if found at compile-time */
#ifdef WIN32
#define INCLUDE_WINSOCK
#include "win32config.h"
#else
#include "config.h"
#endif
#include "xmlversion.h"
#ifdef LIBXML_HTTP_ENABLED
#include <stdio.h>
#include <string.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.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_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include <libxml/xmlmemory.h>
#include <libxml/nanohttp.h>
#ifdef STANDALONE
#define DEBUG_HTTP
#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 */
int 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 */
char *contentType; /* the MIME type for the input */
char *location; /* the new URL in case of redirect */
} xmlNanoHTTPCtxt, *xmlNanoHTTPCtxtPtr;
static int initialized = 0;
static char *proxy = NULL; /* the proxy name if any */
static int proxyPort; /* the proxy port if any */
/**
* xmlNanoHTTPInit:
*
* Initialize the HTTP protocol layer.
* Currently it just checks for proxy informations
*/
void
xmlNanoHTTPInit(void) {
const char *env;
if (initialized)
return;
if (proxy == NULL) {
proxyPort = 80;
env = getenv("no_proxy");
if (env != NULL)
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;
}
/**
* xmlNanoHTTPClenup:
*
* Cleanup the HTTP protocol layer.
*/
void
xmlNanoHTTPCleanup(void) {
if (proxy != NULL)
xmlFree(proxy);
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) {
const char *cur = URL;
char buf[4096];
int index = 0;
int port = 0;
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 (URL == NULL) return;
buf[index] = 0;
while (*cur != 0) {
if ((cur[0] == ':') && (cur[1] == '/') && (cur[2] == '/')) {
buf[index] = 0;
ctxt->protocol = xmlMemStrdup(buf);
index = 0;
cur += 3;
break;
}
buf[index++] = *cur++;
}
if (*cur == 0) return;
buf[index] = 0;
while (1) {
if (cur[0] == ':') {
buf[index] = 0;
ctxt->hostname = xmlMemStrdup(buf);
index = 0;
cur += 1;
while ((*cur >= '0') && (*cur <= '9')) {
port *= 10;
port += *cur - '0';
cur++;
}
if (port != 0) ctxt->port = port;
while ((cur[0] != '/') && (*cur != 0))
cur++;
break;
}
if ((*cur == '/') || (*cur == 0)) {
buf[index] = 0;
ctxt->hostname = xmlMemStrdup(buf);
index = 0;
break;
}
buf[index++] = *cur++;
}
if (*cur == 0)
ctxt->path = xmlMemStrdup("/");
else {
index = 0;
buf[index] = 0;
while (*cur != 0)
buf[index++] = *cur++;
buf[index] = 0;
ctxt->path = xmlMemStrdup(buf);
}
}
/**
* 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 informations.
*/
void
xmlNanoHTTPScanProxy(const char *URL) {
const char *cur = URL;
char buf[4096];
int index = 0;
int port = 0;
if (proxy != NULL) {
xmlFree(proxy);
proxy = NULL;
}
if (proxyPort != 0) {
proxyPort = 0;
}
#ifdef DEBUG_HTTP
if (URL == NULL)
printf("Removing HTTP proxy info\n");
else
printf("Using HTTP proxy %s\n", URL);
#endif
if (URL == NULL) return;
buf[index] = 0;
while (*cur != 0) {
if ((cur[0] == ':') && (cur[1] == '/') && (cur[2] == '/')) {
buf[index] = 0;
index = 0;
cur += 3;
break;
}
buf[index++] = *cur++;
}
if (*cur == 0) return;
buf[index] = 0;
while (1) {
if (cur[0] == ':') {
buf[index] = 0;
proxy = xmlMemStrdup(buf);
index = 0;
cur += 1;
while ((*cur >= '0') && (*cur <= '9')) {
port *= 10;
port += *cur - '0';
cur++;
}
if (port != 0) proxyPort = port;
while ((cur[0] != '/') && (*cur != 0))
cur++;
break;
}
if ((*cur == '/') || (*cur == 0)) {
buf[index] = 0;
proxy = xmlMemStrdup(buf);
index = 0;
break;
}
buf[index++] = *cur++;
}
}
/**
* 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) return(NULL);
memset(ret, 0, sizeof(xmlNanoHTTPCtxt));
ret->port = 80;
ret->returnValue = 0;
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->out != NULL) xmlFree(ctxt->out);
if (ctxt->in != NULL) xmlFree(ctxt->in);
if (ctxt->contentType != NULL) xmlFree(ctxt->contentType);
if (ctxt->location != NULL) xmlFree(ctxt->location);
ctxt->state = XML_NANO_HTTP_NONE;
if (ctxt->fd >= 0) close(ctxt->fd);
ctxt->fd = -1;
xmlFree(ctxt);
}
/**
* xmlNanoHTTPSend:
* @ctxt: an HTTP context
*
* Send the input needed to initiate the processing on the server side
*/
static void
xmlNanoHTTPSend(xmlNanoHTTPCtxtPtr ctxt) {
if (ctxt->state & XML_NANO_HTTP_WRITE)
ctxt->last = write(ctxt->fd, ctxt->outptr, strlen(ctxt->outptr));
}
/**
* 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) {
fd_set rfd;
struct timeval tv;
while (ctxt->state & XML_NANO_HTTP_READ) {
if (ctxt->in == NULL) {
ctxt->in = (char *) xmlMalloc(65000 * sizeof(char));
if (ctxt->in == NULL) {
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;
ctxt->inlen *= 2;
ctxt->in = (char *) xmlRealloc(ctxt->in, ctxt->inlen);
if (ctxt->in == NULL) {
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 = read(ctxt->fd, ctxt->inptr, XML_NANO_HTTP_CHUNK);
if (ctxt->last > 0) {
ctxt->inptr += ctxt->last;
return(ctxt->last);
}
if (ctxt->last == 0) {
return(0);
}
#ifdef EWOULDBLOCK
if ((ctxt->last == -1) && (errno != EWOULDBLOCK)) {
return(0);
}
#endif
tv.tv_sec=10;
tv.tv_usec=0;
FD_ZERO(&rfd);
FD_SET(ctxt->fd, &rfd);
if(select(ctxt->fd+1, &rfd, NULL, NULL, &tv)<1)
return(0);
}
return(0);
}
/**
* xmlNanoHTTPReadLine:
* @ctxt: an HTTP context
*
* Read one line in the HTTP server output, usually for extracting
* the HTTP protocol informations 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;
while(bp - buf < 4095) {
if(ctxt->inrptr == ctxt->inptr) {
if (xmlNanoHTTPRecv(ctxt) == 0) {
if (bp == buf)
return(NULL);
else
*bp = 0;
return(xmlMemStrdup(buf));
}
}
*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 informations from the server answer.
* We currently parse and process:
* - The HTTP revision/ return code
* - The Content-Type
* - The Location for redirrect 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;
} else if (!strncmp(line, "Content-Type:", 13)) {
cur += 13;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if (ctxt->contentType != NULL)
xmlFree(ctxt->contentType);
ctxt->contentType = xmlMemStrdup(cur);
} else if (!strncmp(line, "ContentType:", 12)) {
cur += 12;
if (ctxt->contentType != NULL) return;
while ((*cur == ' ') || (*cur == '\t')) cur++;
ctxt->contentType = xmlMemStrdup(cur);
} else if (!strncmp(line, "content-type:", 13)) {
cur += 13;
if (ctxt->contentType != NULL) return;
while ((*cur == ' ') || (*cur == '\t')) cur++;
ctxt->contentType = xmlMemStrdup(cur);
} else if (!strncmp(line, "contenttype:", 12)) {
cur += 12;
if (ctxt->contentType != NULL) return;
while ((*cur == ' ') || (*cur == '\t')) cur++;
ctxt->contentType = xmlMemStrdup(cur);
} else if (!strncmp(line, "Location:", 9)) {
cur += 9;
while ((*cur == ' ') || (*cur == '\t')) cur++;
if (ctxt->location != NULL)
xmlFree(ctxt->location);
ctxt->location = xmlMemStrdup(cur);
} else if (!strncmp(line, "location:", 9)) {
cur += 9;
if (ctxt->location != NULL) return;
while ((*cur == ' ') || (*cur == '\t')) cur++;
ctxt->location = xmlMemStrdup(cur);
}
}
/**
* xmlNanoHTTPConnectAttempt:
* @ia: an internet adress structure
* @port: the port number
*
* 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 int
xmlNanoHTTPConnectAttempt(struct in_addr ia, int port)
{
int s=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
struct sockaddr_in sin;
fd_set wfd;
struct timeval tv;
int status;
if(s==-1) {
#ifdef DEBUG_HTTP
perror("socket");
#endif
return(-1);
}
#ifdef _WINSOCKAPI_
{
long levents = FD_READ | FD_WRITE | FD_ACCEPT |
FD_CONNECT | FD_CLOSE ;
int rv = 0 ;
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
close(s);
return(-1);
}
#endif /* !VMS */
#endif /* !_WINSOCKAPI_ */
sin.sin_family = AF_INET;
sin.sin_addr = ia;
sin.sin_port = htons(port);
if((connect(s, (struct sockaddr *)&sin, sizeof(sin))==-1) &&
(errno != EINPROGRESS)) {
perror("connect");
close(s);
return(-1);
}
tv.tv_sec = 60; /* We use 60 second timeouts for now */
tv.tv_usec = 0;
FD_ZERO(&wfd);
FD_SET(s, &wfd);
switch(select(s+1, NULL, &wfd, NULL, &tv))
{
case 0:
/* Time out */
close(s);
return(-1);
case -1:
/* Ermm.. ?? */
#ifdef DEBUG_HTTP
perror("select");
#endif
close(s);
return(-1);
}
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 int
xmlNanoHTTPConnectHost(const char *host, int port)
{
struct hostent *h;
int i;
int s;
h=gethostbyname(host);
if(h==NULL)
{
#ifdef DEBUG_HTTP
fprintf(stderr,"unable to resolve '%s'.\n", host);
#endif
return(-1);
}
for(i=0; h->h_addr_list[i]; i++)
{
struct in_addr ia;
memcpy(&ia, h->h_addr_list[i],4);
s = xmlNanoHTTPConnectAttempt(ia, port);
if(s != -1)
return(s);
}
#ifdef DEBUG_HTTP
fprintf(stderr, "unable to connect to '%s'.\n", host);
#endif
return(-1);
}
/**
* 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) {
xmlNanoHTTPCtxtPtr ctxt;
char buf[4096];
int ret;
char *p;
int head;
int nbRedirects = 0;
char *redirURL = NULL;
xmlNanoHTTPInit();
if (contentType != NULL) *contentType = NULL;
retry:
if (redirURL == NULL)
ctxt = xmlNanoHTTPNewCtxt(URL);
else {
ctxt = xmlNanoHTTPNewCtxt(redirURL);
xmlFree(redirURL);
redirURL = NULL;
}
if ((ctxt->protocol == NULL) || (strcmp(ctxt->protocol, "http"))) {
xmlNanoHTTPFreeCtxt(ctxt);
if (redirURL != NULL) xmlFree(redirURL);
return(NULL);
}
if (ctxt->hostname == NULL) {
xmlNanoHTTPFreeCtxt(ctxt);
return(NULL);
}
if (proxy)
ret = xmlNanoHTTPConnectHost(proxy, proxyPort);
else
ret = xmlNanoHTTPConnectHost(ctxt->hostname, ctxt->port);
if (ret < 0) {
xmlNanoHTTPFreeCtxt(ctxt);
return(NULL);
}
ctxt->fd = ret;
if (proxy) {
#ifdef HAVE_SNPRINTF
if (ctxt->port != 80)
snprintf(buf, sizeof(buf),
"GET http://%s:%d%s HTTP/1.0\r\nHost: %s\r\n\r\n",
ctxt->hostname, ctxt->port, ctxt->path, ctxt->hostname);
else
snprintf(buf, sizeof(buf),"GET http://%s%s HTTP/1.0\r\nHost: %s\r\n\r\n",
ctxt->hostname, ctxt->path, ctxt->hostname);
#else
if (ctxt->port != 80)
sprintf(buf,
"GET http://%s:%d%s HTTP/1.0\r\nHost: %s\r\n\r\n",
ctxt->hostname, ctxt->port, ctxt->path, ctxt->hostname);
else
sprintf(buf, "GET http://%s%s HTTP/1.0\r\nHost: %s\r\n\r\n",
ctxt->hostname, ctxt->path, ctxt->hostname);
#endif
#ifdef DEBUG_HTTP
if (ctxt->port != 80)
printf("-> Proxy GET http://%s:%d%s HTTP/1.0\n-> Host: %s\n\n",
ctxt->hostname, ctxt->port, ctxt->path, ctxt->hostname);
else
printf("-> Proxy GET http://%s%s HTTP/1.0\n-> Host: %s\n\n",
ctxt->hostname, ctxt->path, ctxt->hostname);
#endif
} else {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),"GET %s HTTP/1.0\r\nHost: %s\r\n\r\n",
ctxt->path, ctxt->hostname);
#else
sprintf(buf, "GET %s HTTP/1.0\r\nHost: %s\r\n\r\n",
ctxt->path, ctxt->hostname);
#endif
#ifdef DEBUG_HTTP
printf("-> GET %s HTTP/1.0\n-> Host: %s\n\n",
ctxt->path, ctxt->hostname);
#endif
}
ctxt->outptr = ctxt->out = xmlMemStrdup(buf);
ctxt->state = XML_NANO_HTTP_WRITE;
xmlNanoHTTPSend(ctxt);
ctxt->state = XML_NANO_HTTP_READ;
head = 1;
while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
if (head && (*p == 0)) {
head = 0;
ctxt->content = ctxt->inrptr;
xmlFree(p);
break;
}
xmlNanoHTTPScanAnswer(ctxt, p);
#ifdef DEBUG_HTTP
if (p != NULL) printf("<- %s\n", p);
#endif
if (p != NULL) xmlFree(p);
}
if ((ctxt->location != NULL) && (ctxt->returnValue >= 300) &&
(ctxt->returnValue < 400)) {
#ifdef DEBUG_HTTP
printf("\nRedirect to: %s\n", ctxt->location);
#endif
while (xmlNanoHTTPRecv(ctxt)) ;
if (nbRedirects < XML_NANO_HTTP_MAX_REDIR) {
nbRedirects++;
redirURL = xmlMemStrdup(ctxt->location);
xmlNanoHTTPFreeCtxt(ctxt);
goto retry;
}
xmlNanoHTTPFreeCtxt(ctxt);
#ifdef DEBUG_HTTP
printf("Too many redirrects, aborting ...\n");
#endif
return(NULL);
}
if ((contentType != NULL) && (ctxt->contentType != NULL))
*contentType = xmlMemStrdup(ctxt->contentType);
#ifdef DEBUG_HTTP
if (ctxt->contentType != NULL)
printf("\nCode %d, content-type '%s'\n\n",
ctxt->returnValue, ctxt->contentType);
else
printf("\nCode %d, no content-type\n\n",
ctxt->returnValue);
#endif
return((void *) ctxt);
}
/**
* 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;
if (ctx == NULL) return(-1);
if (dest == NULL) return(-1);
if (len <= 0) return(0);
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);
}
#ifndef DEBUG_HTTP
#define DEBUG_HTTP
#endif
/**
* 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
*
* 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) {
xmlNanoHTTPCtxtPtr ctxt;
char buf[20000];
int ret;
char *p;
int head;
int nbRedirects = 0;
char *redirURL = NULL;
if (URL == NULL) return(NULL);
if (method == NULL) method = "GET";
if (contentType != NULL) *contentType = NULL;
retry:
if (redirURL == NULL)
ctxt = xmlNanoHTTPNewCtxt(URL);
else {
ctxt = xmlNanoHTTPNewCtxt(redirURL);
xmlFree(redirURL);
redirURL = NULL;
}
if ((ctxt->protocol == NULL) || (strcmp(ctxt->protocol, "http"))) {
xmlNanoHTTPFreeCtxt(ctxt);
if (redirURL != NULL) xmlFree(redirURL);
return(NULL);
}
if (ctxt->hostname == NULL) {
xmlNanoHTTPFreeCtxt(ctxt);
return(NULL);
}
ret = xmlNanoHTTPConnectHost(ctxt->hostname, ctxt->port);
if (ret < 0) {
xmlNanoHTTPFreeCtxt(ctxt);
return(NULL);
}
ctxt->fd = ret;
if (input == NULL) {
if (headers == NULL) {
if ((contentType == NULL) || (*contentType == NULL)) {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\n\r\n",
method, ctxt->path, ctxt->hostname);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\n\r\n",
method, ctxt->path, ctxt->hostname);
#endif
} else {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\n\r\n",
method, ctxt->path, ctxt->hostname, *contentType);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\n\r\n",
method, ctxt->path, ctxt->hostname, *contentType);
#endif
}
} else {
if ((contentType == NULL) || (*contentType == NULL)) {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\n%s\r\n",
method, ctxt->path, ctxt->hostname, headers);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\n%s\r\n",
method, ctxt->path, ctxt->hostname, headers);
#endif
} else {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\n%s\r\n",
method, ctxt->path, ctxt->hostname, *contentType,
headers);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\n%s\r\n",
method, ctxt->path, ctxt->hostname, *contentType,
headers);
#endif
}
}
} else {
int len = strlen(input);
if (headers == NULL) {
if ((contentType == NULL) || (*contentType == NULL)) {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Length: %d\r\n\r\n%s",
method, ctxt->path, ctxt->hostname, len, input);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Length: %d\r\n\r\n%s",
method, ctxt->path, ctxt->hostname, len, input);
#endif
} else {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\nContent-Length: %d\r\n\r\n%s",
method, ctxt->path, ctxt->hostname, *contentType, len,
input);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\nContent-Length: %d\r\n\r\n%s",
method, ctxt->path, ctxt->hostname, *contentType, len,
input);
#endif
}
} else {
if ((contentType == NULL) || (*contentType == NULL)) {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Length: %d\r\n%s\r\n%s",
method, ctxt->path, ctxt->hostname, len,
headers, input);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Length: %d\r\n%s\r\n%s",
method, ctxt->path, ctxt->hostname, len,
headers, input);
#endif
} else {
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf),
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\nContent-Length: %d\r\n%s\r\n%s",
method, ctxt->path, ctxt->hostname, *contentType,
len, headers, input);
#else
sprintf(buf,
"%s %s HTTP/1.0\r\nHost: %s\r\nContent-Type: %s\r\nContent-Length: %d\r\n%s\r\n%s",
method, ctxt->path, ctxt->hostname, *contentType,
len, headers, input);
#endif
}
}
}
#ifdef DEBUG_HTTP
printf("-> %s", buf);
#endif
ctxt->outptr = ctxt->out = xmlMemStrdup(buf);
ctxt->state = XML_NANO_HTTP_WRITE;
xmlNanoHTTPSend(ctxt);
ctxt->state = XML_NANO_HTTP_READ;
head = 1;
while ((p = xmlNanoHTTPReadLine(ctxt)) != NULL) {
if (head && (*p == 0)) {
head = 0;
ctxt->content = ctxt->inrptr;
if (p != NULL) xmlFree(p);
break;
}
xmlNanoHTTPScanAnswer(ctxt, p);
#ifdef DEBUG_HTTP
if (p != NULL) printf("<- %s\n", p);
#endif
if (p != NULL) xmlFree(p);
}
if ((ctxt->location != NULL) && (ctxt->returnValue >= 300) &&
(ctxt->returnValue < 400)) {
#ifdef DEBUG_HTTP
printf("\nRedirect to: %s\n", ctxt->location);
#endif
while (xmlNanoHTTPRecv(ctxt)) ;
if (nbRedirects < XML_NANO_HTTP_MAX_REDIR) {
nbRedirects++;
redirURL = xmlMemStrdup(ctxt->location);
xmlNanoHTTPFreeCtxt(ctxt);
goto retry;
}
xmlNanoHTTPFreeCtxt(ctxt);
#ifdef DEBUG_HTTP
printf("Too many redirrects, aborting ...\n");
#endif
return(NULL);
}
if ((contentType != NULL) && (ctxt->contentType != NULL))
*contentType = xmlMemStrdup(ctxt->contentType);
else if (contentType != NULL)
*contentType = NULL;
#ifdef DEBUG_HTTP
if (ctxt->contentType != NULL)
printf("\nCode %d, content-type '%s'\n\n",
ctxt->returnValue, ctxt->contentType);
else
printf("\nCode %d, no content-type\n\n",
ctxt->returnValue);
#endif
return((void *) ctxt);
}
/**
* 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 incase of success. The contentType,
* if provided must be freed by the caller
*/
int
xmlNanoHTTPFetch(const char *URL, const char *filename, char **contentType) {
void *ctxt;
char buf[4096];
int fd;
int len;
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);
}
}
while ((len = xmlNanoHTTPRead(ctxt, buf, sizeof(buf))) > 0) {
write(fd, buf, len);
}
xmlNanoHTTPClose(ctxt);
close(fd);
return(0);
}
/**
* 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 incase of success.
*/
int
xmlNanoHTTPSave(void *ctxt, const char *filename) {
char buf[4096];
int fd;
int len;
if (ctxt == NULL) return(-1);
if (!strcmp(filename, "-"))
fd = 0;
else {
fd = open(filename, O_CREAT | O_WRONLY);
if (fd < 0) {
xmlNanoHTTPClose(ctxt);
return(-1);
}
}
while ((len = xmlNanoHTTPRead(ctxt, buf, sizeof(buf))) > 0) {
write(fd, buf, len);
}
xmlNanoHTTPClose(ctxt);
return(0);
}
/**
* xmlNanoHTTPReturnCode:
* @ctx: the HTTP context
*
* Returns the HTTP return code for the request.
*/
int
xmlNanoHTTPReturnCode(void *ctx) {
xmlNanoHTTPCtxtPtr ctxt = (xmlNanoHTTPCtxtPtr) ctx;
if (ctxt == NULL) return(-1);
return(ctxt->returnValue);
}
#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 {
printf("%s: minimal HTTP GET implementation\n", argv[0]);
printf("\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) {
printf("%s : HTTP support not compiled in\n", argv[0]);
return(0);
}
#endif /* STANDALONE */
#endif /* LIBXML_HTTP_ENABLED */
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