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198012ee13
curl/lib/formdata.c
Daniel Stenberg 26eaa83830 AddFormData: prevent only directories from being posted 
Commit f4cc54cb47 (shipped as part of the 7.29.0 release) was a
bug fix that introduced a regression in that while trying to avoid
allowing directory names, it also forbade "special" files like character
devices and more. like "/dev/null" as was used by Oliver who reported
this regression.

Reported by: Oliver Gondža
Bug: http://curl.haxx.se/mail/archive-2013-02/0040.html
2013-03-04 15:52:10 +01:00

1518 lines
44 KiB
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, 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.
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
/* Length of the random boundary string. */
#define BOUNDARY_LENGTH 40
#if !defined(CURL_DISABLE_HTTP) || defined(USE_SSLEAY)
#if defined(HAVE_LIBGEN_H) && defined(HAVE_BASENAME)
#include <libgen.h>
#endif
#include "urldata.h" /* for struct SessionHandle */
#include "formdata.h"
#include "curl_rand.h"
#include "strequal.h"
#include "curl_memory.h"
#include "sendf.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
#endif /* !defined(CURL_DISABLE_HTTP) || defined(USE_SSLEAY) */
#ifndef CURL_DISABLE_HTTP
#ifndef HAVE_BASENAME
static char *Curl_basename(char *path);
#define basename(x) Curl_basename((x))
#endif
static size_t readfromfile(struct Form *form, char *buffer, size_t size);
static char *formboundary(void);
/* What kind of Content-Type to use on un-specified files with unrecognized
extensions. */
#define HTTPPOST_CONTENTTYPE_DEFAULT "application/octet-stream"
#define FORM_FILE_SEPARATOR ','
#define FORM_TYPE_SEPARATOR ';'
/***************************************************************************
*
* AddHttpPost()
*
* Adds a HttpPost structure to the list, if parent_post is given becomes
* a subpost of parent_post instead of a direct list element.
*
* Returns newly allocated HttpPost on success and NULL if malloc failed.
*
***************************************************************************/
static struct curl_httppost *
AddHttpPost(char *name, size_t namelength,
char *value, size_t contentslength,
char *buffer, size_t bufferlength,
char *contenttype,
long flags,
struct curl_slist* contentHeader,
char *showfilename, char *userp,
struct curl_httppost *parent_post,
struct curl_httppost **httppost,
struct curl_httppost **last_post)
{
struct curl_httppost *post;
post = calloc(1, sizeof(struct curl_httppost));
if(post) {
post->name = name;
post->namelength = (long)(name?(namelength?namelength:strlen(name)):0);
post->contents = value;
post->contentslength = (long)contentslength;
post->buffer = buffer;
post->bufferlength = (long)bufferlength;
post->contenttype = contenttype;
post->contentheader = contentHeader;
post->showfilename = showfilename;
post->userp = userp,
post->flags = flags;
}
else
return NULL;
if(parent_post) {
/* now, point our 'more' to the original 'more' */
post->more = parent_post->more;
/* then move the original 'more' to point to ourselves */
parent_post->more = post;
}
else {
/* make the previous point to this */
if(*last_post)
(*last_post)->next = post;
else
(*httppost) = post;
(*last_post) = post;
}
return post;
}
/***************************************************************************
*
* AddFormInfo()
*
* Adds a FormInfo structure to the list presented by parent_form_info.
*
* Returns newly allocated FormInfo on success and NULL if malloc failed/
* parent_form_info is NULL.
*
***************************************************************************/
static FormInfo * AddFormInfo(char *value,
char *contenttype,
FormInfo *parent_form_info)
{
FormInfo *form_info;
form_info = calloc(1, sizeof(struct FormInfo));
if(form_info) {
if(value)
form_info->value = value;
if(contenttype)
form_info->contenttype = contenttype;
form_info->flags = HTTPPOST_FILENAME;
}
else
return NULL;
if(parent_form_info) {
/* now, point our 'more' to the original 'more' */
form_info->more = parent_form_info->more;
/* then move the original 'more' to point to ourselves */
parent_form_info->more = form_info;
}
return form_info;
}
/***************************************************************************
*
* ContentTypeForFilename()
*
* Provides content type for filename if one of the known types (else
* (either the prevtype or the default is returned).
*
* Returns some valid contenttype for filename.
*
***************************************************************************/
static const char * ContentTypeForFilename (const char *filename,
const char *prevtype)
{
const char *contenttype = NULL;
unsigned int i;
/*
* No type was specified, we scan through a few well-known
* extensions and pick the first we match!
*/
struct ContentType {
char extension[6];
const char *type;
};
static const struct ContentType ctts[]={
{".gif", "image/gif"},
{".jpg", "image/jpeg"},
{".jpeg", "image/jpeg"},
{".txt", "text/plain"},
{".html", "text/html"},
{".xml", "application/xml"}
};
if(prevtype)
/* default to the previously set/used! */
contenttype = prevtype;
else
contenttype = HTTPPOST_CONTENTTYPE_DEFAULT;
if(filename) { /* in case a NULL was passed in */
for(i=0; i<sizeof(ctts)/sizeof(ctts[0]); i++) {
if(strlen(filename) >= strlen(ctts[i].extension)) {
if(strequal(filename +
strlen(filename) - strlen(ctts[i].extension),
ctts[i].extension)) {
contenttype = ctts[i].type;
break;
}
}
}
}
/* we have a contenttype by now */
return contenttype;
}
/***************************************************************************
*
* memdup()
*
* Copies the 'source' data to a newly allocated buffer buffer (that is
* returned). Uses buffer_length if not null, else uses strlen to determine
* the length of the buffer to be copied
*
* Returns the new pointer or NULL on failure.
*
***************************************************************************/
static char *memdup(const char *src, size_t buffer_length)
{
size_t length;
bool add = FALSE;
char *buffer;
if(buffer_length)
length = buffer_length;
else if(src) {
length = strlen(src);
add = TRUE;
}
else
/* no length and a NULL src pointer! */
return strdup("");
buffer = malloc(length+add);
if(!buffer)
return NULL; /* fail */
memcpy(buffer, src, length);
/* if length unknown do null termination */
if(add)
buffer[length] = '\0';
return buffer;
}
/***************************************************************************
*
* FormAdd()
*
* Stores a formpost parameter and builds the appropriate linked list.
*
* Has two principal functionalities: using files and byte arrays as
* post parts. Byte arrays are either copied or just the pointer is stored
* (as the user requests) while for files only the filename and not the
* content is stored.
*
* While you may have only one byte array for each name, multiple filenames
* are allowed (and because of this feature CURLFORM_END is needed after
* using CURLFORM_FILE).
*
* Examples:
*
* Simple name/value pair with copied contents:
* curl_formadd (&post, &last, CURLFORM_COPYNAME, "name",
* CURLFORM_COPYCONTENTS, "value", CURLFORM_END);
*
* name/value pair where only the content pointer is remembered:
* curl_formadd (&post, &last, CURLFORM_COPYNAME, "name",
* CURLFORM_PTRCONTENTS, ptr, CURLFORM_CONTENTSLENGTH, 10, CURLFORM_END);
* (if CURLFORM_CONTENTSLENGTH is missing strlen () is used)
*
* storing a filename (CONTENTTYPE is optional!):
* curl_formadd (&post, &last, CURLFORM_COPYNAME, "name",
* CURLFORM_FILE, "filename1", CURLFORM_CONTENTTYPE, "plain/text",
* CURLFORM_END);
*
* storing multiple filenames:
* curl_formadd (&post, &last, CURLFORM_COPYNAME, "name",
* CURLFORM_FILE, "filename1", CURLFORM_FILE, "filename2", CURLFORM_END);
*
* Returns:
* CURL_FORMADD_OK on success
* CURL_FORMADD_MEMORY if the FormInfo allocation fails
* CURL_FORMADD_OPTION_TWICE if one option is given twice for one Form
* CURL_FORMADD_NULL if a null pointer was given for a char
* CURL_FORMADD_MEMORY if the allocation of a FormInfo struct failed
* CURL_FORMADD_UNKNOWN_OPTION if an unknown option was used
* CURL_FORMADD_INCOMPLETE if the some FormInfo is not complete (or error)
* CURL_FORMADD_MEMORY if a HttpPost struct cannot be allocated
* CURL_FORMADD_MEMORY if some allocation for string copying failed.
* CURL_FORMADD_ILLEGAL_ARRAY if an illegal option is used in an array
*
***************************************************************************/
static
CURLFORMcode FormAdd(struct curl_httppost **httppost,
struct curl_httppost **last_post,
va_list params)
{
FormInfo *first_form, *current_form, *form = NULL;
CURLFORMcode return_value = CURL_FORMADD_OK;
const char *prevtype = NULL;
struct curl_httppost *post = NULL;
CURLformoption option;
struct curl_forms *forms = NULL;
char *array_value=NULL; /* value read from an array */
/* This is a state variable, that if TRUE means that we're parsing an
array that we got passed to us. If FALSE we're parsing the input
va_list arguments. */
bool array_state = FALSE;
/*
* We need to allocate the first struct to fill in.
*/
first_form = calloc(1, sizeof(struct FormInfo));
if(!first_form)
return CURL_FORMADD_MEMORY;
current_form = first_form;
/*
* Loop through all the options set. Break if we have an error to report.
*/
while(return_value == CURL_FORMADD_OK) {
/* first see if we have more parts of the array param */
if(array_state && forms) {
/* get the upcoming option from the given array */
option = forms->option;
array_value = (char *)forms->value;
forms++; /* advance this to next entry */
if(CURLFORM_END == option) {
/* end of array state */
array_state = FALSE;
continue;
}
}
else {
/* This is not array-state, get next option */
option = va_arg(params, CURLformoption);
if(CURLFORM_END == option)
break;
}
switch (option) {
case CURLFORM_ARRAY:
if(array_state)
/* we don't support an array from within an array */
return_value = CURL_FORMADD_ILLEGAL_ARRAY;
else {
forms = va_arg(params, struct curl_forms *);
if(forms)
array_state = TRUE;
else
return_value = CURL_FORMADD_NULL;
}
break;
/*
* Set the Name property.
*/
case CURLFORM_PTRNAME:
#ifdef CURL_DOES_CONVERSIONS
/* Treat CURLFORM_PTR like CURLFORM_COPYNAME so that libcurl will copy
* the data in all cases so that we'll have safe memory for the eventual
* conversion.
*/
#else
current_form->flags |= HTTPPOST_PTRNAME; /* fall through */
#endif
case CURLFORM_COPYNAME:
if(current_form->name)
return_value = CURL_FORMADD_OPTION_TWICE;
else {
char *name = array_state?
array_value:va_arg(params, char *);
if(name)
current_form->name = name; /* store for the moment */
else
return_value = CURL_FORMADD_NULL;
}
break;
case CURLFORM_NAMELENGTH:
if(current_form->namelength)
return_value = CURL_FORMADD_OPTION_TWICE;
else
current_form->namelength =
array_state?(size_t)array_value:(size_t)va_arg(params, long);
break;
/*
* Set the contents property.
*/
case CURLFORM_PTRCONTENTS:
current_form->flags |= HTTPPOST_PTRCONTENTS; /* fall through */
case CURLFORM_COPYCONTENTS:
if(current_form->value)
return_value = CURL_FORMADD_OPTION_TWICE;
else {
char *value =
array_state?array_value:va_arg(params, char *);
if(value)
current_form->value = value; /* store for the moment */
else
return_value = CURL_FORMADD_NULL;
}
break;
case CURLFORM_CONTENTSLENGTH:
if(current_form->contentslength)
return_value = CURL_FORMADD_OPTION_TWICE;
else
current_form->contentslength =
array_state?(size_t)array_value:(size_t)va_arg(params, long);
break;
/* Get contents from a given file name */
case CURLFORM_FILECONTENT:
if(current_form->flags != 0)
return_value = CURL_FORMADD_OPTION_TWICE;
else {
const char *filename = array_state?
array_value:va_arg(params, char *);
if(filename) {
current_form->value = strdup(filename);
if(!current_form->value)
return_value = CURL_FORMADD_MEMORY;
else {
current_form->flags |= HTTPPOST_READFILE;
current_form->value_alloc = TRUE;
}
}
else
return_value = CURL_FORMADD_NULL;
}
break;
/* We upload a file */
case CURLFORM_FILE:
{
const char *filename = array_state?array_value:
va_arg(params, char *);
if(current_form->value) {
if(current_form->flags & HTTPPOST_FILENAME) {
if(filename) {
char *fname = strdup(filename);
if(!fname)
return_value = CURL_FORMADD_MEMORY;
else {
form = AddFormInfo(fname, NULL, current_form);
if(!form) {
Curl_safefree(fname);
return_value = CURL_FORMADD_MEMORY;
}
else {
form->value_alloc = TRUE;
current_form = form;
form = NULL;
}
}
}
else
return_value = CURL_FORMADD_NULL;
}
else
return_value = CURL_FORMADD_OPTION_TWICE;
}
else {
if(filename) {
current_form->value = strdup(filename);
if(!current_form->value)
return_value = CURL_FORMADD_MEMORY;
else {
current_form->flags |= HTTPPOST_FILENAME;
current_form->value_alloc = TRUE;
}
}
else
return_value = CURL_FORMADD_NULL;
}
break;
}
case CURLFORM_BUFFERPTR:
current_form->flags |= HTTPPOST_PTRBUFFER|HTTPPOST_BUFFER;
if(current_form->buffer)
return_value = CURL_FORMADD_OPTION_TWICE;
else {
char *buffer =
array_state?array_value:va_arg(params, char *);
if(buffer) {
current_form->buffer = buffer; /* store for the moment */
current_form->value = buffer; /* make it non-NULL to be accepted
as fine */
}
else
return_value = CURL_FORMADD_NULL;
}
break;
case CURLFORM_BUFFERLENGTH:
if(current_form->bufferlength)
return_value = CURL_FORMADD_OPTION_TWICE;
else
current_form->bufferlength =
array_state?(size_t)array_value:(size_t)va_arg(params, long);
break;
case CURLFORM_STREAM:
current_form->flags |= HTTPPOST_CALLBACK;
if(current_form->userp)
return_value = CURL_FORMADD_OPTION_TWICE;
else {
char *userp =
array_state?array_value:va_arg(params, char *);
if(userp) {
current_form->userp = userp;
current_form->value = userp; /* this isn't strictly true but we
derive a value from this later on
and we need this non-NULL to be
accepted as a fine form part */
}
else
return_value = CURL_FORMADD_NULL;
}
break;
case CURLFORM_CONTENTTYPE:
{
const char *contenttype =
array_state?array_value:va_arg(params, char *);
if(current_form->contenttype) {
if(current_form->flags & HTTPPOST_FILENAME) {
if(contenttype) {
char *type = strdup(contenttype);
if(!type)
return_value = CURL_FORMADD_MEMORY;
else {
form = AddFormInfo(NULL, type, current_form);
if(!form) {
Curl_safefree(type);
return_value = CURL_FORMADD_MEMORY;
}
else {
form->contenttype_alloc = TRUE;
current_form = form;
form = NULL;
}
}
}
else
return_value = CURL_FORMADD_NULL;
}
else
return_value = CURL_FORMADD_OPTION_TWICE;
}
else {
if(contenttype) {
current_form->contenttype = strdup(contenttype);
if(!current_form->contenttype)
return_value = CURL_FORMADD_MEMORY;
else
current_form->contenttype_alloc = TRUE;
}
else
return_value = CURL_FORMADD_NULL;
}
break;
}
case CURLFORM_CONTENTHEADER:
{
/* this "cast increases required alignment of target type" but
we consider it OK anyway */
struct curl_slist* list = array_state?
(struct curl_slist*)array_value:
va_arg(params, struct curl_slist*);
if(current_form->contentheader)
return_value = CURL_FORMADD_OPTION_TWICE;
else
current_form->contentheader = list;
break;
}
case CURLFORM_FILENAME:
case CURLFORM_BUFFER:
{
const char *filename = array_state?array_value:
va_arg(params, char *);
if(current_form->showfilename)
return_value = CURL_FORMADD_OPTION_TWICE;
else {
current_form->showfilename = strdup(filename);
if(!current_form->showfilename)
return_value = CURL_FORMADD_MEMORY;
else
current_form->showfilename_alloc = TRUE;
}
break;
}
default:
return_value = CURL_FORMADD_UNKNOWN_OPTION;
break;
}
}
if(CURL_FORMADD_OK != return_value) {
/* On error, free allocated fields for all nodes of the FormInfo linked
list without deallocating nodes. List nodes are deallocated later on */
FormInfo *ptr;
for(ptr = first_form; ptr != NULL; ptr = ptr->more) {
if(ptr->name_alloc) {
Curl_safefree(ptr->name);
ptr->name_alloc = FALSE;
}
if(ptr->value_alloc) {
Curl_safefree(ptr->value);
ptr->value_alloc = FALSE;
}
if(ptr->contenttype_alloc) {
Curl_safefree(ptr->contenttype);
ptr->contenttype_alloc = FALSE;
}
if(ptr->showfilename_alloc) {
Curl_safefree(ptr->showfilename);
ptr->showfilename_alloc = FALSE;
}
}
}
if(CURL_FORMADD_OK == return_value) {
/* go through the list, check for completeness and if everything is
* alright add the HttpPost item otherwise set return_value accordingly */
post = NULL;
for(form = first_form;
form != NULL;
form = form->more) {
if(((!form->name || !form->value) && !post) ||
( (form->contentslength) &&
(form->flags & HTTPPOST_FILENAME) ) ||
( (form->flags & HTTPPOST_FILENAME) &&
(form->flags & HTTPPOST_PTRCONTENTS) ) ||
( (!form->buffer) &&
(form->flags & HTTPPOST_BUFFER) &&
(form->flags & HTTPPOST_PTRBUFFER) ) ||
( (form->flags & HTTPPOST_READFILE) &&
(form->flags & HTTPPOST_PTRCONTENTS) )
) {
return_value = CURL_FORMADD_INCOMPLETE;
break;
}
else {
if(((form->flags & HTTPPOST_FILENAME) ||
(form->flags & HTTPPOST_BUFFER)) &&
!form->contenttype ) {
/* our contenttype is missing */
form->contenttype
= strdup(ContentTypeForFilename(form->value, prevtype));
if(!form->contenttype) {
return_value = CURL_FORMADD_MEMORY;
break;
}
form->contenttype_alloc = TRUE;
}
if(!(form->flags & HTTPPOST_PTRNAME) &&
(form == first_form) ) {
/* Note that there's small risk that form->name is NULL here if the
app passed in a bad combo, so we better check for that first. */
if(form->name)
/* copy name (without strdup; possibly contains null characters) */
form->name = memdup(form->name, form->namelength);
if(!form->name) {
return_value = CURL_FORMADD_MEMORY;
break;
}
form->name_alloc = TRUE;
}
if(!(form->flags & (HTTPPOST_FILENAME | HTTPPOST_READFILE |
HTTPPOST_PTRCONTENTS | HTTPPOST_PTRBUFFER |
HTTPPOST_CALLBACK)) ) {
/* copy value (without strdup; possibly contains null characters) */
form->value = memdup(form->value, form->contentslength);
if(!form->value) {
return_value = CURL_FORMADD_MEMORY;
break;
}
form->value_alloc = TRUE;
}
post = AddHttpPost(form->name, form->namelength,
form->value, form->contentslength,
form->buffer, form->bufferlength,
form->contenttype, form->flags,
form->contentheader, form->showfilename,
form->userp,
post, httppost,
last_post);
if(!post) {
return_value = CURL_FORMADD_MEMORY;
break;
}
if(form->contenttype)
prevtype = form->contenttype;
}
}
if(CURL_FORMADD_OK != return_value) {
/* On error, free allocated fields for nodes of the FormInfo linked
list which are not already owned by the httppost linked list
without deallocating nodes. List nodes are deallocated later on */
FormInfo *ptr;
for(ptr = form; ptr != NULL; ptr = ptr->more) {
if(ptr->name_alloc) {
Curl_safefree(ptr->name);
ptr->name_alloc = FALSE;
}
if(ptr->value_alloc) {
Curl_safefree(ptr->value);
ptr->value_alloc = FALSE;
}
if(ptr->contenttype_alloc) {
Curl_safefree(ptr->contenttype);
ptr->contenttype_alloc = FALSE;
}
if(ptr->showfilename_alloc) {
Curl_safefree(ptr->showfilename);
ptr->showfilename_alloc = FALSE;
}
}
}
}
/* Always deallocate FormInfo linked list nodes without touching node
fields given that these have either been deallocated or are owned
now by the httppost linked list */
while(first_form) {
FormInfo *ptr = first_form->more;
Curl_safefree(first_form);
first_form = ptr;
}
return return_value;
}
/*
* curl_formadd() is a public API to add a section to the multipart formpost.
*
* @unittest: 1308
*/
CURLFORMcode curl_formadd(struct curl_httppost **httppost,
struct curl_httppost **last_post,
...)
{
va_list arg;
CURLFORMcode result;
va_start(arg, last_post);
result = FormAdd(httppost, last_post, arg);
va_end(arg);
return result;
}
/*
* AddFormData() adds a chunk of data to the FormData linked list.
*
* size is incremented by the chunk length, unless it is NULL
*/
static CURLcode AddFormData(struct FormData **formp,
enum formtype type,
const void *line,
size_t length,
curl_off_t *size)
{
struct FormData *newform = malloc(sizeof(struct FormData));
if(!newform)
return CURLE_OUT_OF_MEMORY;
newform->next = NULL;
if(type <= FORM_CONTENT) {
/* we make it easier for plain strings: */
if(!length)
length = strlen((char *)line);
newform->line = malloc(length+1);
if(!newform->line) {
free(newform);
return CURLE_OUT_OF_MEMORY;
}
memcpy(newform->line, line, length);
newform->length = length;
newform->line[length]=0; /* zero terminate for easier debugging */
}
else
/* For callbacks and files we don't have any actual data so we just keep a
pointer to whatever this points to */
newform->line = (char *)line;
newform->type = type;
if(*formp) {
(*formp)->next = newform;
*formp = newform;
}
else
*formp = newform;
if(size) {
if(type != FORM_FILE)
/* for static content as well as callback data we add the size given
as input argument */
*size += length;
else {
/* Since this is a file to be uploaded here, add the size of the actual
file */
if(!strequal("-", newform->line)) {
struct_stat file;
if(!stat(newform->line, &file) && !S_ISDIR(file.st_mode))
*size += file.st_size;
else
return CURLE_BAD_FUNCTION_ARGUMENT;
}
}
}
return CURLE_OK;
}
/*
* AddFormDataf() adds printf()-style formatted data to the formdata chain.
*/
static CURLcode AddFormDataf(struct FormData **formp,
curl_off_t *size,
const char *fmt, ...)
{
char s[4096];
va_list ap;
va_start(ap, fmt);
vsnprintf(s, sizeof(s), fmt, ap);
va_end(ap);
return AddFormData(formp, FORM_DATA, s, 0, size);
}
/*
* Curl_formclean() is used from http.c, this cleans a built FormData linked
* list
*/
void Curl_formclean(struct FormData **form_ptr)
{
struct FormData *next, *form;
form = *form_ptr;
if(!form)
return;
do {
next=form->next; /* the following form line */
if(form->type <= FORM_CONTENT)
free(form->line); /* free the line */
free(form); /* free the struct */
} while((form = next) != NULL); /* continue */
*form_ptr = NULL;
}
/*
* curl_formget()
* Serialize a curl_httppost struct.
* Returns 0 on success.
*
* @unittest: 1308
*/
int curl_formget(struct curl_httppost *form, void *arg,
curl_formget_callback append)
{
CURLcode rc;
curl_off_t size;
struct FormData *data, *ptr;
rc = Curl_getformdata(NULL, &data, form, NULL, &size);
if(rc != CURLE_OK)
return (int)rc;
for(ptr = data; ptr; ptr = ptr->next) {
if((ptr->type == FORM_FILE) || (ptr->type == FORM_CALLBACK)) {
char buffer[8192];
size_t nread;
struct Form temp;
Curl_FormInit(&temp, ptr);
do {
nread = readfromfile(&temp, buffer, sizeof(buffer));
if((nread == (size_t) -1) ||
(nread > sizeof(buffer)) ||
(nread != append(arg, buffer, nread))) {
if(temp.fp)
fclose(temp.fp);
Curl_formclean(&data);
return -1;
}
} while(nread);
}
else {
if(ptr->length != append(arg, ptr->line, ptr->length)) {
Curl_formclean(&data);
return -1;
}
}
}
Curl_formclean(&data);
return 0;
}
/*
* curl_formfree() is an external function to free up a whole form post
* chain
*/
void curl_formfree(struct curl_httppost *form)
{
struct curl_httppost *next;
if(!form)
/* no form to free, just get out of this */
return;
do {
next=form->next; /* the following form line */
/* recurse to sub-contents */
if(form->more)
curl_formfree(form->more);
if(!(form->flags & HTTPPOST_PTRNAME) && form->name)
free(form->name); /* free the name */
if(!(form->flags &
(HTTPPOST_PTRCONTENTS|HTTPPOST_BUFFER|HTTPPOST_CALLBACK)) &&
form->contents)
free(form->contents); /* free the contents */
if(form->contenttype)
free(form->contenttype); /* free the content type */
if(form->showfilename)
free(form->showfilename); /* free the faked file name */
free(form); /* free the struct */
} while((form = next) != NULL); /* continue */
}
#ifndef HAVE_BASENAME
/*
(Quote from The Open Group Base Specifications Issue 6 IEEE Std 1003.1, 2004
Edition)
The basename() function shall take the pathname pointed to by path and
return a pointer to the final component of the pathname, deleting any
trailing '/' characters.
If the string pointed to by path consists entirely of the '/' character,
basename() shall return a pointer to the string "/". If the string pointed
to by path is exactly "//", it is implementation-defined whether '/' or "//"
is returned.
If path is a null pointer or points to an empty string, basename() shall
return a pointer to the string ".".
The basename() function may modify the string pointed to by path, and may
return a pointer to static storage that may then be overwritten by a
subsequent call to basename().
The basename() function need not be reentrant. A function that is not
required to be reentrant is not required to be thread-safe.
*/
static char *Curl_basename(char *path)
{
/* Ignore all the details above for now and make a quick and simple
implementaion here */
char *s1;
char *s2;
s1=strrchr(path, '/');
s2=strrchr(path, '\\');
if(s1 && s2) {
path = (s1 > s2? s1 : s2)+1;
}
else if(s1)
path = s1 + 1;
else if(s2)
path = s2 + 1;
return path;
}
#endif
static char *strippath(const char *fullfile)
{
char *filename;
char *base;
filename = strdup(fullfile); /* duplicate since basename() may ruin the
buffer it works on */
if(!filename)
return NULL;
base = strdup(basename(filename));
free(filename); /* free temporary buffer */
return base; /* returns an allocated string or NULL ! */
}
static CURLcode formdata_add_filename(const struct curl_httppost *file,
struct FormData **form,
curl_off_t *size)
{
CURLcode result = CURLE_OK;
char *filename = file->showfilename;
char *filebasename = NULL;
char *filename_escaped = NULL;
if(!filename) {
filebasename = strippath(file->contents);
if(!filebasename)
return CURLE_OUT_OF_MEMORY;
filename = filebasename;
}
if(strchr(filename, '\\') || strchr(filename, '"')) {
char *p0, *p1;
/* filename need be escaped */
filename_escaped = malloc(strlen(filename)*2+1);
if(!filename_escaped)
return CURLE_OUT_OF_MEMORY;
p0 = filename_escaped;
p1 = filename;
while(*p1) {
if(*p1 == '\\' || *p1 == '"')
*p0++ = '\\';
*p0++ = *p1++;
}
*p0 = '\0';
filename = filename_escaped;
}
result = AddFormDataf(form, size,
"; filename=\"%s\"",
filename);
Curl_safefree(filename_escaped);
Curl_safefree(filebasename);
return result;
}
/*
* Curl_getformdata() converts a linked list of "meta data" into a complete
* (possibly huge) multipart formdata. The input list is in 'post', while the
* output resulting linked lists gets stored in '*finalform'. *sizep will get
* the total size of the whole POST.
* A multipart/form_data content-type is built, unless a custom content-type
* is passed in 'custom_content_type'.
*
* This function will not do a failf() for the potential memory failures but
* should for all other errors it spots. Just note that this function MAY get
* a NULL pointer in the 'data' argument.
*/
CURLcode Curl_getformdata(struct SessionHandle *data,
struct FormData **finalform,
struct curl_httppost *post,
const char *custom_content_type,
curl_off_t *sizep)
{
struct FormData *form = NULL;
struct FormData *firstform;
struct curl_httppost *file;
CURLcode result = CURLE_OK;
curl_off_t size = 0; /* support potentially ENORMOUS formposts */
char *boundary;
char *fileboundary = NULL;
struct curl_slist* curList;
*finalform = NULL; /* default form is empty */
if(!post)
return result; /* no input => no output! */
boundary = formboundary();
if(!boundary)
return CURLE_OUT_OF_MEMORY;
/* Make the first line of the output */
result = AddFormDataf(&form, NULL,
"%s; boundary=%s\r\n",
custom_content_type?custom_content_type:
"Content-Type: multipart/form-data",
boundary);
if(result) {
Curl_safefree(boundary);
return result;
}
/* we DO NOT include that line in the total size of the POST, since it'll be
part of the header! */
firstform = form;
do {
if(size) {
result = AddFormDataf(&form, &size, "\r\n");
if(result)
break;
}
/* boundary */
result = AddFormDataf(&form, &size, "--%s\r\n", boundary);
if(result)
break;
/* Maybe later this should be disabled when a custom_content_type is
passed, since Content-Disposition is not meaningful for all multipart
types.
*/
result = AddFormDataf(&form, &size,
"Content-Disposition: form-data; name=\"");
if(result)
break;
result = AddFormData(&form, FORM_DATA, post->name, post->namelength,
&size);
if(result)
break;
result = AddFormDataf(&form, &size, "\"");
if(result)
break;
if(post->more) {
/* If used, this is a link to more file names, we must then do
the magic to include several files with the same field name */
Curl_safefree(fileboundary);
fileboundary = formboundary();
if(!fileboundary) {
result = CURLE_OUT_OF_MEMORY;
break;
}
result = AddFormDataf(&form, &size,
"\r\nContent-Type: multipart/mixed,"
" boundary=%s\r\n",
fileboundary);
if(result)
break;
}
file = post;
do {
/* If 'showfilename' is set, that is a faked name passed on to us
to use to in the formpost. If that is not set, the actually used
local file name should be added. */
if(post->more) {
/* if multiple-file */
result = AddFormDataf(&form, &size,
"\r\n--%s\r\nContent-Disposition: "
"attachment",
fileboundary);
if(result)
break;
result = formdata_add_filename(file, &form, &size);
if(result)
break;
}
else if(post->flags & (HTTPPOST_FILENAME|HTTPPOST_BUFFER|
HTTPPOST_CALLBACK)) {
/* it should be noted that for the HTTPPOST_FILENAME and
HTTPPOST_CALLBACK cases the ->showfilename struct member is always
assigned at this point */
if(post->showfilename || (post->flags & HTTPPOST_FILENAME)) {
result = formdata_add_filename(post, &form, &size);
}
if(result)
break;
}
if(file->contenttype) {
/* we have a specified type */
result = AddFormDataf(&form, &size,
"\r\nContent-Type: %s",
file->contenttype);
if(result)
break;
}
curList = file->contentheader;
while(curList) {
/* Process the additional headers specified for this form */
result = AddFormDataf( &form, &size, "\r\n%s", curList->data );
if(result)
break;
curList = curList->next;
}
if(result)
break;
result = AddFormDataf(&form, &size, "\r\n\r\n");
if(result)
break;
if((post->flags & HTTPPOST_FILENAME) ||
(post->flags & HTTPPOST_READFILE)) {
/* we should include the contents from the specified file */
FILE *fileread;
fileread = strequal("-", file->contents)?
stdin:fopen(file->contents, "rb"); /* binary read for win32 */
/*
* VMS: This only allows for stream files on VMS. Stream files are
* OK, as are FIXED & VAR files WITHOUT implied CC For implied CC,
* every record needs to have a \n appended & 1 added to SIZE
*/
if(fileread) {
if(fileread != stdin) {
/* close the file */
fclose(fileread);
/* add the file name only - for later reading from this */
result = AddFormData(&form, FORM_FILE, file->contents, 0, &size);
}
else {
/* When uploading from stdin, we can't know the size of the file,
* thus must read the full file as before. We *could* use chunked
* transfer-encoding, but that only works for HTTP 1.1 and we
* can't be sure we work with such a server.
*/
size_t nread;
char buffer[512];
while((nread = fread(buffer, 1, sizeof(buffer), fileread)) != 0) {
result = AddFormData(&form, FORM_CONTENT, buffer, nread, &size);
if(result)
break;
}
}
}
else {
if(data)
failf(data, "couldn't open file \"%s\"", file->contents);
*finalform = NULL;
result = CURLE_READ_ERROR;
}
}
else if(post->flags & HTTPPOST_BUFFER)
/* include contents of buffer */
result = AddFormData(&form, FORM_CONTENT, post->buffer,
post->bufferlength, &size);
else if(post->flags & HTTPPOST_CALLBACK)
/* the contents should be read with the callback and the size
is set with the contentslength */
result = AddFormData(&form, FORM_CALLBACK, post->userp,
post->contentslength, &size);
else
/* include the contents we got */
result = AddFormData(&form, FORM_CONTENT, post->contents,
post->contentslength, &size);
file = file->more;
} while(file && !result); /* for each specified file for this field */
if(result)
break;
if(post->more) {
/* this was a multiple-file inclusion, make a termination file
boundary: */
result = AddFormDataf(&form, &size,
"\r\n--%s--",
fileboundary);
if(result)
break;
}
} while((post = post->next) != NULL); /* for each field */
/* end-boundary for everything */
if(CURLE_OK == result)
result = AddFormDataf(&form, &size,
"\r\n--%s--\r\n",
boundary);
if(result) {
Curl_formclean(&firstform);
Curl_safefree(fileboundary);
Curl_safefree(boundary);
return result;
}
*sizep = size;
Curl_safefree(fileboundary);
Curl_safefree(boundary);
*finalform = firstform;
return result;
}
/*
* Curl_FormInit() inits the struct 'form' points to with the 'formdata'
* and resets the 'sent' counter.
*/
int Curl_FormInit(struct Form *form, struct FormData *formdata )
{
if(!formdata)
return 1; /* error */
form->data = formdata;
form->sent = 0;
form->fp = NULL;
form->fread_func = ZERO_NULL;
return 0;
}
/*
* readfromfile()
*
* The read callback that this function may use can return a value larger than
* 'size' (which then this function returns) that indicates a problem and it
* must be properly dealt with
*/
static size_t readfromfile(struct Form *form, char *buffer,
size_t size)
{
size_t nread;
bool callback = (form->data->type == FORM_CALLBACK)?TRUE:FALSE;
if(callback) {
if(form->fread_func == ZERO_NULL)
return 0;
else
nread = form->fread_func(buffer, 1, size, form->data->line);
}
else {
if(!form->fp) {
/* this file hasn't yet been opened */
form->fp = fopen(form->data->line, "rb"); /* b is for binary */
if(!form->fp)
return (size_t)-1; /* failure */
}
nread = fread(buffer, 1, size, form->fp);
}
if(!nread) {
/* this is the last chunk from the file, move on */
if(form->fp) {
fclose(form->fp);
form->fp = NULL;
}
form->data = form->data->next;
}
return nread;
}
/*
* Curl_FormReader() is the fread() emulation function that will be used to
* deliver the formdata to the transfer loop and then sent away to the peer.
*/
size_t Curl_FormReader(char *buffer,
size_t size,
size_t nitems,
FILE *mydata)
{
struct Form *form;
size_t wantedsize;
size_t gotsize = 0;
form=(struct Form *)mydata;
wantedsize = size * nitems;
if(!form->data)
return 0; /* nothing, error, empty */
if((form->data->type == FORM_FILE) ||
(form->data->type == FORM_CALLBACK)) {
gotsize = readfromfile(form, buffer, wantedsize);
if(gotsize)
/* If positive or -1, return. If zero, continue! */
return gotsize;
}
do {
if((form->data->length - form->sent ) > wantedsize - gotsize) {
memcpy(buffer + gotsize , form->data->line + form->sent,
wantedsize - gotsize);
form->sent += wantedsize-gotsize;
return wantedsize;
}
memcpy(buffer+gotsize,
form->data->line + form->sent,
(form->data->length - form->sent) );
gotsize += form->data->length - form->sent;
form->sent = 0;
form->data = form->data->next; /* advance */
} while(form->data && (form->data->type < FORM_CALLBACK));
/* If we got an empty line and we have more data, we proceed to the next
line immediately to avoid returning zero before we've reached the end. */
return gotsize;
}
/*
* Curl_formpostheader() returns the first line of the formpost, the
* request-header part (which is not part of the request-body like the rest of
* the post).
*/
char *Curl_formpostheader(void *formp, size_t *len)
{
char *header;
struct Form *form=(struct Form *)formp;
if(!form->data)
return 0; /* nothing, ERROR! */
header = form->data->line;
*len = form->data->length;
form->data = form->data->next; /* advance */
return header;
}
/*
* formboundary() creates a suitable boundary string and returns an allocated
* one.
*/
static char *formboundary(void)
{
char *retstring;
size_t i;
static const char table16[]="0123456789abcdef";
retstring = malloc(BOUNDARY_LENGTH+1);
if(!retstring)
return NULL; /* failed */
strcpy(retstring, "----------------------------");
for(i=strlen(retstring); i<BOUNDARY_LENGTH; i++)
retstring[i] = table16[Curl_rand()%16];
/* 28 dashes and 12 hexadecimal digits makes 12^16 (184884258895036416)
combinations */
retstring[BOUNDARY_LENGTH]=0; /* zero terminate */
return retstring;
}
#else /* CURL_DISABLE_HTTP */
CURLFORMcode curl_formadd(struct curl_httppost **httppost,
struct curl_httppost **last_post,
...)
{
(void)httppost;
(void)last_post;
return CURL_FORMADD_DISABLED;
}
int curl_formget(struct curl_httppost *form, void *arg,
curl_formget_callback append)
{
(void) form;
(void) arg;
(void) append;
return CURL_FORMADD_DISABLED;
}
void curl_formfree(struct curl_httppost *form)
{
(void)form;
/* does nothing HTTP is disabled */
}
#endif /* !defined(CURL_DISABLE_HTTP) */
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