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curl/lib/http.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2002, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* 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 COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
#include "setup.h"
#ifndef CURL_DISABLE_HTTP
/* -- 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>
#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, const 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
CURLcode add_buffer_send(int sockfd, struct connectdata *conn, send_buffer *in,
long *bytes_written)
{
ssize_t amount;
CURLcode res;
char *ptr;
int size;
/* The looping below is required since we use non-blocking sockets, but due
to the circumstances we will just loop and try again and again etc */
ptr = in->buffer;
size = in->size_used;
do {
res = Curl_write(conn, sockfd, ptr, size, &amount);
if(CURLE_OK != res)
break;
if(conn->data->set.verbose)
/* this data _may_ contain binary stuff */
Curl_debug(conn->data, CURLINFO_HEADER_OUT, ptr, amount);
if(amount != size) {
size -= amount;
ptr += amount;
}
else
break;
} while(1);
if(in->buffer)
free(in->buffer);
free(in);
*bytes_written += amount;
return res;
}
/*
* add_bufferf() builds a buffer from the formatted input
*/
static
CURLcode add_bufferf(send_buffer *in, const 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, const void *inptr, size_t size)
{
char *new_rb;
int new_size;
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 */
/* ------------------------------------------------------------------------- */
/*
* Curl_compareheader()
*
* Returns TRUE if 'headerline' contains the 'header' with given 'content'.
* Pass headers WITH the colon.
*/
bool
Curl_compareheader(char *headerline, /* line to check */
const char *header, /* header keyword _with_ colon */
const char *content) /* content string to find */
{
/* RFC2616, section 4.2 says: "Each header field consists of a name followed
* by a colon (":") and the field value. Field names are case-insensitive.
* The field value MAY be preceded by any amount of LWS, though a single SP
* is preferred." */
size_t hlen = strlen(header);
size_t clen;
size_t len;
char *start;
char *end;
if(!strnequal(headerline, header, hlen))
return FALSE; /* doesn't start with header */
/* pass the header */
start = &headerline[hlen];
/* pass all white spaces */
while(*start && isspace((int)*start))
start++;
/* find the end of the header line */
end = strchr(start, '\r'); /* lines end with CRLF */
if(!end) {
/* in case there's a non-standard compliant line here */
end = strchr(start, '\n');
if(!end)
/* hm, there's no line ending here, use the zero byte! */
end = strchr(start, '\0');
}
len = end-start; /* length of the content part of the input line */
clen = strlen(content); /* length of the word to find */
/* find the content string in the rest of the line */
for(;len>=clen;len--, start++) {
if(strnequal(start, content, clen))
return TRUE; /* match! */
}
return FALSE; /* no match */
}
/*
* This function checks the linked list of custom HTTP headers for a particular
* header (prefix).
*/
static char *checkheaders(struct SessionHandle *data, const char *thisheader)
{
struct curl_slist *head;
size_t thislen = strlen(thisheader);
for(head = data->set.headers; head; head=head->next) {
if(strnequal(head->data, thisheader, thislen))
return head->data;
}
return NULL;
}
/*
* 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 SessionHandle *data=conn->data;
CURLcode result;
int res;
int nread; /* total size read */
int perline; /* count bytes per line */
bool keepon=TRUE;
ssize_t gotbytes;
char *ptr;
int timeout = 3600; /* default timeout in seconds */
struct timeval interval;
fd_set rkeepfd;
fd_set readfd;
char *line_start;
#define SELECT_OK 0
#define SELECT_ERROR 1
#define SELECT_TIMEOUT 2
int error = SELECT_OK;
infof(data, "Establish HTTP proxy tunnel to %s:%d\n", hostname, remote_port);
/* OK, now send the connect request to the proxy */
result =
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->set.useragent?conn->allocptr.uagent:"")
);
if(result) {
failf(data, "Failed sending CONNECT to proxy");
return result;
}
/* Now, read the full reply we get from the proxy */
if(data->set.timeout) {
/* if timeout is requested, find out how much remaining time we have */
timeout = data->set.timeout - /* timeout time */
Curl_tvdiff(Curl_tvnow(), conn->now)/1000; /* spent time */
if(timeout <=0 ) {
failf(data, "Transfer aborted due to timeout");
return -SELECT_TIMEOUT; /* already too little time */
}
}
FD_ZERO (&readfd); /* clear it */
FD_SET (tunnelsocket, &readfd); /* read socket */
/* get this in a backup variable to be able to restore it on each lap in the
select() loop */
rkeepfd = readfd;
ptr=data->state.buffer;
line_start = ptr;
nread=0;
perline=0;
keepon=TRUE;
while((nread<BUFSIZE) && (keepon && !error)) {
readfd = rkeepfd; /* set every lap */
interval.tv_sec = timeout;
interval.tv_usec = 0;
switch (select (tunnelsocket+1, &readfd, NULL, NULL, &interval)) {
case -1: /* select() error, stop reading */
error = SELECT_ERROR;
failf(data, "Transfer aborted due to select() error");
break;
case 0: /* timeout */
error = SELECT_TIMEOUT;
failf(data, "Transfer aborted due to timeout");
break;
default:
/*
* This code previously didn't use the kerberos sec_read() code
* to read, but when we use Curl_read() it may do so. Do confirm
* that this is still ok and then remove this comment!
*/
res= Curl_read(conn, tunnelsocket, ptr, BUFSIZE-nread,
&gotbytes);
if(res< 0)
/* EWOULDBLOCK */
continue; /* go loop yourself */
else if(res)
keepon = FALSE;
else if(gotbytes <= 0) {
keepon = FALSE;
error = SELECT_ERROR;
failf(data, "Connection aborted");
}
else {
/* we got a whole chunk of data, which can be anything from one
* byte to a set of lines and possibly just a piece of the last
* line */
int i;
nread += gotbytes;
for(i = 0; i < gotbytes; ptr++, i++) {
perline++; /* amount of bytes in this line so far */
if(*ptr=='\n') {
/* a newline is CRLF in ftp-talk, so the CR is ignored as
the line isn't really terminated until the LF comes */
/* output debug output if that is requested */
if(data->set.verbose)
Curl_debug(data, CURLINFO_DATA_IN, line_start, perline);
if('\r' == line_start[0]) {
/* end of headers */
keepon=FALSE;
break; /* breaks out of loop, not switch */
}
if(2 == sscanf(line_start, "HTTP/1.%d %d",
&subversion,
&httperror)) {
;
}
perline=0; /* line starts over here */
line_start = ptr+1;
}
}
}
break;
} /* switch */
} /* while there's buffer left and loop is requested */
if(error)
return CURLE_RECV_ERROR;
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_RECV_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 SessionHandle *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->bits.httpproxy &&
((conn->protocol & PROT_HTTPS) || data->set.tunnel_thru_httpproxy)) {
/* either HTTPS over proxy, OR explicitly asked for a tunnel */
result = Curl_ConnectHTTPProxyTunnel(conn, conn->firstsocket,
conn->hostname, conn->remote_port);
if(CURLE_OK != result)
return result;
}
if(conn->protocol & PROT_HTTPS) {
/* now, perform the SSL initialization for this socket */
result = Curl_SSLConnect(conn);
if(result)
return result;
}
if(conn->bits.user_passwd && !data->state.this_is_a_follow) {
/* Authorization: is requested, this is not a followed location, get the
original host name */
if (data->state.auth_host)
/* Free to avoid leaking memory on multiple requests*/
free(data->state.auth_host);
data->state.auth_host = strdup(conn->hostname);
}
return CURLE_OK;
}
CURLcode Curl_http_done(struct connectdata *conn)
{
struct SessionHandle *data;
struct HTTP *http;
data=conn->data;
http=conn->proto.http;
if(HTTPREQ_POST_FORM == data->set.httpreq) {
conn->bytecount = http->readbytecount + http->writebytecount;
Curl_formclean(http->sendit); /* Now free that whole lot */
data->set.fread = http->storefread; /* restore */
data->set.in = http->in; /* restore */
}
else if(HTTPREQ_PUT == data->set.httpreq)
conn->bytecount = http->readbytecount + http->writebytecount;
if(0 == (http->readbytecount + conn->headerbytecount)) {
/* nothing was read from the HTTP server, this can't be right
so we return an error here */
failf(data, "Empty reply from server");
return CURLE_GOT_NOTHING;
}
return CURLE_OK;
}
CURLcode Curl_http(struct connectdata *conn)
{
struct SessionHandle *data=conn->data;
char *buf = data->state.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;
const char *te = ""; /* tranfer-encoding */
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->set.upload) {
data->set.httpreq = HTTPREQ_PUT;
}
/* 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->state.this_is_a_follow ||
!data->state.auth_host ||
curl_strequal(data->state.auth_host, conn->hostname)) {
sprintf(data->state.buffer, "%s:%s",
data->state.user, data->state.passwd);
if(Curl_base64_encode(data->state.buffer, strlen(data->state.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->change.referer) && !checkheaders(data, "Referer:")) {
if(conn->allocptr.ref)
free(conn->allocptr.ref);
conn->allocptr.ref = aprintf("Referer: %s\015\012", data->change.referer);
}
if(data->set.cookie && !checkheaders(data, "Cookie:")) {
if(conn->allocptr.cookie)
free(conn->allocptr.cookie);
conn->allocptr.cookie = aprintf("Cookie: %s\015\012", data->set.cookie);
}
if(!conn->bits.upload_chunky && (data->set.httpreq != HTTPREQ_GET)) {
/* not a chunky transfer but data is to be sent */
char *ptr = checkheaders(data, "Transfer-Encoding:");
if(ptr) {
/* Some kind of TE is requested, check if 'chunked' is chosen */
if(Curl_compareheader(ptr, "Transfer-Encoding:", "chunked"))
/* we have been told explicitly to upload chunky so deal with it! */
conn->bits.upload_chunky = TRUE;
}
}
if(conn->bits.upload_chunky) {
/* RFC2616 section 4.4:
Messages MUST NOT include both a Content-Length header field and a
non-identity transfer-coding. If the message does include a non-
identity transfer-coding, the Content-Length MUST be ignored. */
if(!checkheaders(data, "Transfer-Encoding:")) {
te = "Transfer-Encoding: chunked\r\n";
}
else {
/* The "Transfer-Encoding:" header was already added. */
te = "";
}
}
if(data->cookies) {
co = Curl_cookie_getlist(data->cookies,
host, ppath,
(conn->protocol&PROT_HTTPS?TRUE:FALSE));
}
if (data->change.proxy && *data->change.proxy &&
!data->set.tunnel_thru_httpproxy &&
!(conn->protocol&PROT_HTTPS)) {
/* The path sent to the proxy is in fact the entire URL */
ppath = data->change.url;
}
if(HTTPREQ_POST_FORM == data->set.httpreq) {
/* 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 */
result = Curl_getFormData(&http->sendit, data->set.httppost,
&http->postsize);
if(CURLE_OK != result) {
/* Curl_getFormData() doesn't use failf() */
failf(data, "failed creating formpost data");
return result;
}
}
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);
/* When building Host: headers, we must put the host name within
[brackets] if the host name is a plain IPv6-address. RFC2732-style. */
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%s%s\r\n",
conn->bits.ipv6_ip?"[":"",
host,
conn->bits.ipv6_ip?"]":"");
else
conn->allocptr.host = aprintf("Host: %s%s%s:%d\r\n",
conn->bits.ipv6_ip?"[":"",
host,
conn->bits.ipv6_ip?"]":"",
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(( (HTTPREQ_POST == data->set.httpreq) ||
(HTTPREQ_POST_FORM == data->set.httpreq) ||
(HTTPREQ_PUT == data->set.httpreq) ) &&
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->set.fread(data->state.buffer, 1, readthisamountnow,
data->set.in);
passed += actuallyread;
if(actuallyread != readthisamountnow) {
failf(data, "Could only read %d bytes from the input",
passed);
return CURLE_READ_ERROR;
}
} while(passed != conn->resume_from); /* loop until done */
/* now, decrease the size of the read */
if(data->set.infilesize>0) {
data->set.infilesize -= conn->resume_from;
if(data->set.infilesize <= 0) {
failf(data, "File already completely uploaded");
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->set.httpreq == HTTPREQ_GET) &&
!checkheaders(data, "Range:")) {
/* if a line like this was already allocated, free the previous one */
if(conn->allocptr.rangeline)
free(conn->allocptr.rangeline);
conn->allocptr.rangeline = aprintf("Range: bytes=%s\r\n", conn->range);
}
else if((data->set.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->set.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->set.infilesize);
}
}
}
do {
/* Use 1.1 unless the use specificly asked for 1.0 */
const char *httpstring=
data->set.httpversion==CURL_HTTP_VERSION_1_0?"1.0":"1.1";
send_buffer *req_buffer;
struct curl_slist *headers=data->set.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/%s\r\n" /* path */
"%s" /* proxyuserpwd */
"%s" /* userpwd */
"%s" /* range */
"%s" /* user agent */
"%s" /* cookie */
"%s" /* host */
"%s" /* pragma */
"%s" /* accept */
"%s" /* accept-encoding */
"%s" /* referer */
"%s",/* transfer-encoding */
data->set.customrequest?data->set.customrequest:
(data->set.no_body?"HEAD":
((HTTPREQ_POST == data->set.httpreq) ||
(HTTPREQ_POST_FORM == data->set.httpreq))?"POST":
(HTTPREQ_PUT == data->set.httpreq)?"PUT":"GET"),
ppath, httpstring,
(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->set.useragent && *data->set.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->set.encoding && *data->set.encoding && conn->allocptr.accept_encoding)?
conn->allocptr.accept_encoding:"", /* 08/28/02 jhrg */
(data->change.referer && conn->allocptr.ref)?conn->allocptr.ref:"" /* Referer: <data> <CRLF> */,
te
);
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->set.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_GMTIME_R
/* thread-safe version */
struct tm keeptime;
thistime = (struct tm *)gmtime_r(&data->set.timevalue, &keeptime);
#else
thistime = gmtime(&data->set.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 GMT", thistime);
#else
/* TODO: Right, we *could* write a replacement here */
strcpy(buf, "no strftime() support");
#endif
switch(data->set.timecondition) {
case CURL_TIMECOND_IFMODSINCE:
default:
add_bufferf(req_buffer,
"If-Modified-Since: %s\r\n", buf);
break;
case CURL_TIMECOND_IFUNMODSINCE:
add_bufferf(req_buffer,
"If-Unmodified-Since: %s\r\n", buf);
break;
case CURL_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;
}
switch(data->set.httpreq) {
case HTTPREQ_POST_FORM:
if(Curl_FormInit(&http->form, http->sendit)) {
failf(data, "Internal HTTP POST error!");
return CURLE_HTTP_POST_ERROR;
}
http->storefread = data->set.fread; /* backup */
http->in = data->set.in; /* backup */
data->set.fread = (curl_read_callback)
Curl_FormReader; /* set the read function to read from the
generated form data */
data->set.in = (FILE *)&http->form;
if(!conn->bits.upload_chunky)
/* only add Content-Length if not uploading chunked */
add_bufferf(req_buffer,
"Content-Length: %d\r\n", http->postsize);
if(!checkheaders(data, "Expect:")) {
/* if not disabled explicitly we add a Expect: 100-continue
to the headers which actually speeds up post operations (as
there is one packet coming back from the web server) */
add_bufferf(req_buffer,
"Expect: 100-continue\r\n");
data->set.expect100header = TRUE;
}
if(!checkheaders(data, "Content-Type:")) {
/* Get Content-Type: line from Curl_FormReadOneLine, which happens
to always be the first line. We can know this for sure since
we always build the formpost linked list the same way!
The Content-Type header line also contains the MIME boundary
string etc why disabling this header is likely to not make things
work, but we support it anyway.
*/
char contentType[256];
int linelength=0;
linelength = Curl_FormReadOneLine (contentType,
sizeof(contentType),
1,
(FILE *)&http->form);
if(linelength == -1) {
failf(data, "Could not get Content-Type header line!");
return CURLE_HTTP_POST_ERROR;
}
add_buffer(req_buffer, contentType, linelength);
}
/* make the request end in a true CRLF */
add_buffer(req_buffer, "\r\n", 2);
/* set upload size to the progress meter */
Curl_pgrsSetUploadSize(data, http->postsize);
/* fire away the whole request to the server */
result = add_buffer_send(conn->firstsocket, conn, req_buffer,
&data->info.request_size);
if(result)
failf(data, "Failed sending POST request");
else
/* setup variables for the upcoming transfer */
result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
&http->readbytecount,
conn->firstsocket,
&http->writebytecount);
if(result) {
Curl_formclean(http->sendit); /* free that whole lot */
return result;
}
break;
case HTTPREQ_PUT: /* Let's PUT the data to the server! */
if((data->set.infilesize>0) && !conn->bits.upload_chunky)
/* only add Content-Length if not uploading chunked */
add_bufferf(req_buffer,
"Content-Length: %d\r\n", /* file size */
data->set.infilesize );
add_bufferf(req_buffer, "\r\n");
/* set the upload size to the progress meter */
Curl_pgrsSetUploadSize(data, data->set.infilesize);
/* this sends the buffer and frees all the buffer resources */
result = add_buffer_send(conn->firstsocket, conn, req_buffer,
&data->info.request_size);
if(result)
failf(data, "Faied sending POST request");
else
/* prepare for transfer */
result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
&http->readbytecount,
conn->firstsocket,
&http->writebytecount);
if(result)
return result;
break;
case HTTPREQ_POST:
/* this is the simple POST, using x-www-form-urlencoded style */
if(!conn->bits.upload_chunky) {
/* We only set Content-Length and allow a custom Content-Length if
we don't upload data chunked, as RFC2616 forbids us to set both
kinds of headers (Transfer-Encoding: chunked and Content-Length) */
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->set.postfieldsize?
data->set.postfieldsize:
(data->set.postfields?strlen(data->set.postfields):0) );
}
if(!checkheaders(data, "Content-Type:"))
add_bufferf(req_buffer,
"Content-Type: application/x-www-form-urlencoded\r\n");
add_buffer(req_buffer, "\r\n", 2);
/* and here comes the actual data */
if(data->set.postfieldsize && data->set.postfields) {
add_buffer(req_buffer, data->set.postfields,
data->set.postfieldsize);
}
else if(data->set.postfields)
add_bufferf(req_buffer,
"%s",
data->set.postfields );
/* issue the request */
result = add_buffer_send(conn->firstsocket, conn, req_buffer,
&data->info.request_size);
if(result)
failf(data, "Failed sending HTTP POST request");
else
result =
Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
&http->readbytecount,
data->set.postfields?-1:conn->firstsocket,
data->set.postfields?NULL:&http->writebytecount);
break;
default:
add_buffer(req_buffer, "\r\n", 2);
/* issue the request */
result = add_buffer_send(conn->firstsocket, conn, req_buffer,
&data->info.request_size);
if(result)
failf(data, "Failed sending HTTP request");
else
/* HTTP GET/HEAD download: */
result = Curl_Transfer(conn, conn->firstsocket, -1, TRUE,
&http->readbytecount,
-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;
}
/*
* local variables:
* eval: (load-file "../curl-mode.el")
* end:
* vim600: fdm=marker
* vim: et sw=2 ts=2 sts=2 tw=78
*/
#endif
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