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curl/lib/http.c

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/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2000, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* In order to be useful for every potential user, curl and libcurl are
* dual-licensed under the MPL and the MIT/X-derivate licenses.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the MPL or the MIT/X-derivate
* licenses. You may pick one of these licenses.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
*****************************************************************************/
#include "setup.h"
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#ifdef NEED_REENTRANT
#define _REENTRANT /* Necessary to use in Solaris, since the silly guys at Sun
made the localtime_r() prototype dependent on it (or
_POSIX_C_SOURCE or _POSIX_PTHREAD_SEMANTICS). */
#endif
#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
#include <winsock.h>
#include <time.h>
#include <io.h>
#else
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <sys/time.h>
#ifdef HAVE_TIME_H
#ifdef TIME_WITH_SYS_TIME
#include <time.h>
#endif
#endif
#include <sys/resource.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <netdb.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#include <sys/ioctl.h>
#include <signal.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "formdata.h"
#include "progress.h"
#include "base64.h"
#include "cookie.h"
#include "strequal.h"
#include "ssluse.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#ifdef MALLOCDEBUG
#include "memdebug.h"
#endif
/* ------------------------------------------------------------------------- */
/*
* The add_buffer series of functions are used to build one large memory chunk
* from repeated function invokes. Used so that the entire HTTP request can
* be sent in one go.
*/
static CURLcode
add_buffer(send_buffer *in, void *inptr, size_t size);
/*
* add_buffer_init() returns a fine buffer struct
*/
static
send_buffer *add_buffer_init(void)
{
send_buffer *blonk;
blonk=(send_buffer *)malloc(sizeof(send_buffer));
if(blonk) {
memset(blonk, 0, sizeof(send_buffer));
return blonk;
}
return NULL; /* failed, go home */
}
/*
* add_buffer_send() sends a buffer and frees all associated memory.
*/
static
size_t add_buffer_send(int sockfd, struct connectdata *conn, send_buffer *in)
{
size_t amount;
if(conn->data->bits.verbose) {
fputs("> ", conn->data->err);
/* this data _may_ contain binary stuff */
fwrite(in->buffer, in->size_used, 1, conn->data->err);
}
Curl_write(conn, sockfd, in->buffer, in->size_used, &amount);
if(in->buffer)
free(in->buffer);
free(in);
return amount;
}
/*
* add_bufferf() builds a buffer from the formatted input
*/
static
CURLcode add_bufferf(send_buffer *in, char *fmt, ...)
{
CURLcode result = CURLE_OUT_OF_MEMORY;
char *s;
va_list ap;
va_start(ap, fmt);
s = vaprintf(fmt, ap); /* this allocs a new string to append */
va_end(ap);
if(s) {
result = add_buffer(in, s, strlen(s));
free(s);
}
return result;
}
/*
* add_buffer() appends a memory chunk to the existing one
*/
static
CURLcode add_buffer(send_buffer *in, void *inptr, size_t size)
{
char *new_rb;
int new_size;
if(size > 0) {
if(!in->buffer ||
((in->size_used + size) > (in->size_max - 1))) {
new_size = (in->size_used+size)*2;
if(in->buffer)
/* we have a buffer, enlarge the existing one */
new_rb = (char *)realloc(in->buffer, new_size);
else
/* create a new buffer */
new_rb = (char *)malloc(new_size);
if(!new_rb)
return CURLE_OUT_OF_MEMORY;
in->buffer = new_rb;
in->size_max = new_size;
}
memcpy(&in->buffer[in->size_used], inptr, size);
in->size_used += size;
}
return CURLE_OK;
}
/* end of the add_buffer functions */
/* ------------------------------------------------------------------------- */
/*
* Read everything until a newline.
*/
static
int GetLine(int sockfd, char *buf, struct connectdata *conn)
{
ssize_t nread;
int read_rc=1;
char *ptr;
struct UrlData *data=conn->data;
ptr=buf;
/* get us a full line, terminated with a newline */
for(nread=0;
(nread<BUFSIZE) && read_rc;
nread++, ptr++) {
if((CURLE_OK != Curl_read(conn, sockfd, ptr, 1, &nread)) ||
(nread <= 0) ||
(*ptr == '\n'))
break;
}
*ptr=0; /* zero terminate */
if(data->bits.verbose) {
fputs("< ", data->err);
fwrite(buf, 1, nread, data->err);
fputs("\n", data->err);
}
return nread>0?nread:0;
}
/*
* This function checks the linked list of custom HTTP headers for a particular
* header (prefix).
*/
bool static checkheaders(struct UrlData *data, char *thisheader)
{
struct curl_slist *head;
size_t thislen = strlen(thisheader);
for(head = data->headers; head; head=head->next) {
if(strnequal(head->data, thisheader, thislen)) {
return TRUE;
}
}
return FALSE;
}
/*
* ConnectHTTPProxyTunnel() requires that we're connected to a HTTP proxy. This
* function will issue the necessary commands to get a seamless tunnel through
* this proxy. After that, the socket can be used just as a normal socket.
*/
CURLcode Curl_ConnectHTTPProxyTunnel(struct connectdata *conn,
int tunnelsocket,
char *hostname, int remote_port)
{
int httperror=0;
int subversion=0;
struct UrlData *data=conn->data;
infof(data, "Establish HTTP proxy tunnel to %s:%d\n", hostname, remote_port);
/* OK, now send the connect request to the proxy */
Curl_sendf(tunnelsocket, conn,
"CONNECT %s:%d HTTP/1.0\015\012"
"%s"
"%s"
"\r\n",
hostname, remote_port,
(conn->bits.proxy_user_passwd)?conn->allocptr.proxyuserpwd:"",
(data->useragent?conn->allocptr.uagent:"")
);
/* wait for the proxy to send us a HTTP/1.0 200 OK header */
while(GetLine(tunnelsocket, data->buffer, conn)) {
if('\r' == data->buffer[0])
break; /* end of headers */
if(2 == sscanf(data->buffer, "HTTP/1.%d %d",
&subversion,
&httperror)) {
;
}
}
if(200 != httperror) {
if(407 == httperror)
/* Added Nov 6 1998 */
failf(data, "Proxy requires authorization!");
else
failf(data, "Received error code %d from proxy", httperror);
return CURLE_READ_ERROR;
}
infof (data, "Proxy replied to CONNECT request\n");
return CURLE_OK;
}
/*
* HTTP stuff to do at connect-time.
*/
CURLcode Curl_http_connect(struct connectdata *conn)
{
struct UrlData *data;
CURLcode result;
data=conn->data;
/* If we are not using a proxy and we want a secure connection,
* perform SSL initialization & connection now.
* If using a proxy with https, then we must tell the proxy to CONNECT
* us to the host we want to talk to. Only after the connect
* has occured, can we start talking SSL
*/
if (conn->protocol & PROT_HTTPS) {
if (data->bits.httpproxy) {
/* HTTPS through a proxy can only be done with a tunnel */
result = Curl_ConnectHTTPProxyTunnel(conn, conn->firstsocket,
conn->hostname, conn->remote_port);
if(CURLE_OK != result)
return result;
}
/* now, perform the SSL initialization for this socket */
result = Curl_SSLConnect(conn);
if(result)
return result;
}
if(conn->bits.user_passwd && !data->bits.this_is_a_follow) {
/* Authorization: is requested, this is not a followed location, get the
original host name */
data->auth_host = strdup(conn->hostname);
}
return CURLE_OK;
}
/* called from curl_close() when this struct is about to get wasted, free
protocol-specific resources */
CURLcode Curl_http_close(struct connectdata *conn)
{
if(conn->data->auth_host)
free(conn->data->auth_host);
return CURLE_OK;
}
CURLcode Curl_http_done(struct connectdata *conn)
{
struct UrlData *data;
long *bytecount = &conn->bytecount;
struct HTTP *http;
data=conn->data;
http=conn->proto.http;
if(data->bits.http_formpost) {
*bytecount = http->readbytecount + http->writebytecount;
Curl_FormFree(http->sendit); /* Now free that whole lot */
data->fread = http->storefread; /* restore */
data->in = http->in; /* restore */
}
else if(data->bits.http_put) {
*bytecount = http->readbytecount + http->writebytecount;
}
return CURLE_OK;
}
CURLcode Curl_http(struct connectdata *conn)
{
struct UrlData *data=conn->data;
char *buf = data->buffer; /* this is a short cut to the buffer */
CURLcode result=CURLE_OK;
struct HTTP *http;
struct Cookie *co=NULL; /* no cookies from start */
char *ppath = conn->ppath; /* three previous function arguments */
char *host = conn->name;
long *bytecount = &conn->bytecount;
if(!conn->proto.http) {
/* Only allocate this struct if we don't already have it! */
http = (struct HTTP *)malloc(sizeof(struct HTTP));
if(!http)
return CURLE_OUT_OF_MEMORY;
memset(http, 0, sizeof(struct HTTP));
conn->proto.http = http;
}
else
http = conn->proto.http;
/* We default to persistant connections */
conn->bits.close = FALSE;
if ( (conn->protocol&(PROT_HTTP|PROT_FTP)) &&
data->bits.upload) {
data->bits.http_put=1;
}
/* The User-Agent string has been built in url.c already, because it might
have been used in the proxy connect, but if we have got a header with
the user-agent string specified, we erase the previously made string
here. */
if(checkheaders(data, "User-Agent:") && conn->allocptr.uagent) {
free(conn->allocptr.uagent);
conn->allocptr.uagent=NULL;
}
if((conn->bits.user_passwd) && !checkheaders(data, "Authorization:")) {
char *authorization;
/* To prevent the user+password to get sent to other than the original
host due to a location-follow, we do some weirdo checks here */
if(!data->bits.this_is_a_follow ||
!data->auth_host ||
strequal(data->auth_host, conn->hostname)) {
sprintf(data->buffer, "%s:%s", data->user, data->passwd);
if(Curl_base64_encode(data->buffer, strlen(data->buffer),
&authorization) >= 0) {
if(conn->allocptr.userpwd)
free(conn->allocptr.userpwd);
conn->allocptr.userpwd = aprintf( "Authorization: Basic %s\015\012",
authorization);
free(authorization);
}
}
}
if((data->bits.http_set_referer) && !checkheaders(data, "Referer:")) {
if(conn->allocptr.ref)
free(conn->allocptr.ref);
conn->allocptr.ref = aprintf("Referer: %s\015\012", data->referer);
}
if(data->cookie && !checkheaders(data, "Cookie:")) {
if(conn->allocptr.cookie)
free(conn->allocptr.cookie);
conn->allocptr.cookie = aprintf("Cookie: %s\015\012", data->cookie);
}
if(data->cookies) {
co = Curl_cookie_getlist(data->cookies,
host,
ppath,
conn->protocol&PROT_HTTPS?TRUE:FALSE);
}
if ((data->bits.httpproxy) && !(conn->protocol&PROT_HTTPS)) {
/* The path sent to the proxy is in fact the entire URL */
ppath = data->url;
}
if(data->bits.http_formpost) {
/* we must build the whole darned post sequence first, so that we have
a size of the whole shebang before we start to send it */
http->sendit = Curl_getFormData(data->httppost, &http->postsize);
}
if(!checkheaders(data, "Host:")) {
/* if ptr_host is already set, it is almost OK since we only re-use
connections to the very same host and port, but when we use a HTTP
proxy we have a persistant connect and yet we must change the Host:
header! */
if(conn->allocptr.host)
free(conn->allocptr.host);
if(((conn->protocol&PROT_HTTPS) && (conn->remote_port == PORT_HTTPS)) ||
(!(conn->protocol&PROT_HTTPS) && (conn->remote_port == PORT_HTTP)) )
/* If (HTTPS on port 443) OR (non-HTTPS on port 80) then don't include
the port number in the host string */
conn->allocptr.host = aprintf("Host: %s\r\n", host);
else
conn->allocptr.host = aprintf("Host: %s:%d\r\n", host,
conn->remote_port);
}
if(!checkheaders(data, "Pragma:"))
http->p_pragma = "Pragma: no-cache\r\n";
if(!checkheaders(data, "Accept:"))
http->p_accept = "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, */*\r\n";
if((data->bits.http_post ||
data->bits.http_formpost ||
data->bits.http_put) &&
conn->resume_from) {
/**********************************************************************
* Resuming upload in HTTP means that we PUT or POST and that we have
* got a resume_from value set. The resume value has already created
* a Range: header that will be passed along. We need to "fast forward"
* the file the given number of bytes and decrease the assume upload
* file size before we continue this venture in the dark lands of HTTP.
*********************************************************************/
if(conn->resume_from < 0 ) {
/*
* This is meant to get the size of the present remote-file by itself.
* We don't support this now. Bail out!
*/
conn->resume_from = 0;
}
if(conn->resume_from) {
/* do we still game? */
int passed=0;
/* Now, let's read off the proper amount of bytes from the
input. If we knew it was a proper file we could've just
fseek()ed but we only have a stream here */
do {
int readthisamountnow = (conn->resume_from - passed);
int actuallyread;
if(readthisamountnow > BUFSIZE)
readthisamountnow = BUFSIZE;
actuallyread =
data->fread(data->buffer, 1, readthisamountnow, data->in);
passed += actuallyread;
if(actuallyread != readthisamountnow) {
failf(data, "Could only read %d bytes from the input\n",
passed);
return CURLE_READ_ERROR;
}
} while(passed != conn->resume_from); /* loop until done */
/* now, decrease the size of the read */
if(data->infilesize>0) {
data->infilesize -= conn->resume_from;
if(data->infilesize <= 0) {
failf(data, "File already completely uploaded\n");
return CURLE_PARTIAL_FILE;
}
}
/* we've passed, proceed as normal */
}
}
if(conn->bits.use_range) {
/*
* A range is selected. We use different headers whether we're downloading
* or uploading and we always let customized headers override our internal
* ones if any such are specified.
*/
if((data->httpreq == HTTPREQ_GET) &&
!checkheaders(data, "Range:")) {
conn->allocptr.rangeline = aprintf("Range: bytes=%s\r\n", conn->range);
}
else if((data->httpreq != HTTPREQ_GET) &&
!checkheaders(data, "Content-Range:")) {
if(conn->resume_from) {
/* This is because "resume" was selected */
long total_expected_size= conn->resume_from + data->infilesize;
conn->allocptr.rangeline = aprintf("Content-Range: bytes %s%ld/%ld\r\n",
conn->range, total_expected_size-1,
total_expected_size);
}
else {
/* Range was selected and then we just pass the incoming range and
append total size */
conn->allocptr.rangeline = aprintf("Content-Range: bytes %s/%d\r\n",
conn->range, data->infilesize);
}
}
}
do {
send_buffer *req_buffer;
struct curl_slist *headers=data->headers;
/* initialize a dynamic send-buffer */
req_buffer = add_buffer_init();
/* add the main request stuff */
add_bufferf(req_buffer,
"%s " /* GET/HEAD/POST/PUT */
"%s HTTP/1.1\r\n" /* path */
"%s" /* proxyuserpwd */
"%s" /* userpwd */
"%s" /* range */
"%s" /* user agent */
"%s" /* cookie */
"%s" /* host */
"%s" /* pragma */
"%s" /* accept */
"%s", /* referer */
data->customrequest?data->customrequest:
(data->bits.no_body?"HEAD":
(data->bits.http_post || data->bits.http_formpost)?"POST":
(data->bits.http_put)?"PUT":"GET"),
ppath,
(conn->bits.proxy_user_passwd &&
conn->allocptr.proxyuserpwd)?conn->allocptr.proxyuserpwd:"",
(conn->bits.user_passwd && conn->allocptr.userpwd)?
conn->allocptr.userpwd:"",
(conn->bits.use_range && conn->allocptr.rangeline)?
conn->allocptr.rangeline:"",
(data->useragent && *data->useragent && conn->allocptr.uagent)?
conn->allocptr.uagent:"",
(conn->allocptr.cookie?conn->allocptr.cookie:""), /* Cookie: <data> */
(conn->allocptr.host?conn->allocptr.host:""), /* Host: host */
http->p_pragma?http->p_pragma:"",
http->p_accept?http->p_accept:"",
(data->bits.http_set_referer && conn->allocptr.ref)?conn->allocptr.ref:"" /* Referer: <data> <CRLF> */
);
if(co) {
int count=0;
struct Cookie *store=co;
/* now loop through all cookies that matched */
while(co) {
if(co->value && strlen(co->value)) {
if(0 == count) {
add_bufferf(req_buffer, "Cookie: ");
}
add_bufferf(req_buffer,
"%s%s=%s", count?"; ":"", co->name, co->value);
count++;
}
co = co->next; /* next cookie please */
}
if(count) {
add_buffer(req_buffer, "\r\n", 2);
}
Curl_cookie_freelist(store); /* free the cookie list */
co=NULL;
}
if(data->timecondition) {
struct tm *thistime;
/* Phil Karn (Fri, 13 Apr 2001) pointed out that the If-Modified-Since
* header family should have their times set in GMT as RFC2616 defines:
* "All HTTP date/time stamps MUST be represented in Greenwich Mean Time
* (GMT), without exception. For the purposes of HTTP, GMT is exactly
* equal to UTC (Coordinated Universal Time)." (see page 20 of RFC2616).
*/
#ifdef HAVE_LOCALTIME_R
/* thread-safe version */
/* We assume that the presense of localtime_r() proves the presense
of gmtime_r() which is a bit ugly but might work */
struct tm keeptime;
thistime = (struct tm *)gmtime_r(&data->timevalue, &keeptime);
#else
thistime = gmtime(&data->timevalue);
#endif
if(NULL == thistime) {
failf(data, "localtime() failed!");
return CURLE_OUT_OF_MEMORY;
}
#ifdef HAVE_STRFTIME
/* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
strftime(buf, BUFSIZE-1, "%a, %d %b %Y %H:%M:%S %Z", thistime);
#else
/* TODO: Right, we *could* write a replacement here */
strcpy(buf, "no strftime() support");
#endif
switch(data->timecondition) {
case TIMECOND_IFMODSINCE:
default:
add_bufferf(req_buffer,
"If-Modified-Since: %s\r\n", buf);
break;
case TIMECOND_IFUNMODSINCE:
add_bufferf(req_buffer,
"If-Unmodified-Since: %s\r\n", buf);
break;
case TIMECOND_LASTMOD:
add_bufferf(req_buffer,
"Last-Modified: %s\r\n", buf);
break;
}
}
while(headers) {
char *ptr = strchr(headers->data, ':');
if(ptr) {
/* we require a colon for this to be a true header */
ptr++; /* pass the colon */
while(*ptr && isspace((int)*ptr))
ptr++;
if(*ptr) {
/* only send this if the contents was non-blank */
add_bufferf(req_buffer, "%s\r\n", headers->data);
}
}
headers = headers->next;
}
if(data->bits.http_formpost) {
if(Curl_FormInit(&http->form, http->sendit)) {
failf(data, "Internal HTTP POST error!\n");
return CURLE_HTTP_POST_ERROR;
}
http->storefread = data->fread; /* backup */
http->in = data->in; /* backup */
data->fread = (curl_read_callback)
Curl_FormReader; /* set the read function to read from the
generated form data */
data->in = (FILE *)&http->form;
add_bufferf(req_buffer,
"Content-Length: %d\r\n", http->postsize-2);
/* set upload size to the progress meter */
Curl_pgrsSetUploadSize(data, http->postsize);
data->request_size =
add_buffer_send(conn->firstsocket, conn, req_buffer);
result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
&http->readbytecount,
conn->firstsocket,
&http->writebytecount);
if(result) {
Curl_FormFree(http->sendit); /* free that whole lot */
return result;
}
}
else if(data->bits.http_put) {
/* Let's PUT the data to the server! */
if(data->infilesize>0) {
add_bufferf(req_buffer,
"Content-Length: %d\r\n\r\n", /* file size */
data->infilesize );
}
else
add_bufferf(req_buffer, "\015\012");
/* set the upload size to the progress meter */
Curl_pgrsSetUploadSize(data, data->infilesize);
/* this sends the buffer and frees all the buffer resources */
data->request_size =
add_buffer_send(conn->firstsocket, conn, req_buffer);
/* prepare for transfer */
result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
&http->readbytecount,
conn->firstsocket,
&http->writebytecount);
if(result)
return result;
}
else {
if(data->bits.http_post) {
/* this is the simple POST, using x-www-form-urlencoded style */
if(!checkheaders(data, "Content-Length:"))
/* we allow replacing this header, although it isn't very wise to
actually set your own */
add_bufferf(req_buffer,
"Content-Length: %d\r\n",
(data->postfieldsize?data->postfieldsize:
strlen(data->postfields)) );
if(!checkheaders(data, "Content-Type:"))
add_bufferf(req_buffer,
"Content-Type: application/x-www-form-urlencoded\r\n");
/* and here comes the actual data */
if(data->postfieldsize) {
add_buffer(req_buffer, "\r\n", 2);
add_buffer(req_buffer, data->postfields,
data->postfieldsize);
add_buffer(req_buffer, "\r\n", 2);
}
else {
add_bufferf(req_buffer,
"\r\n"
"%s\r\n",
data->postfields );
}
}
else
add_buffer(req_buffer, "\r\n", 2);
/* issue the request */
data->request_size =
add_buffer_send(conn->firstsocket, conn, req_buffer);
/* HTTP GET/HEAD download: */
result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE, bytecount,
-1, NULL); /* nothing to upload */
}
if(result)
return result;
} while (0); /* this is just a left-over from the multiple document download
attempts */
return CURLE_OK;
}
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