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/* sane - Scanner Access Now Easy.
Copyright (C) 2019 Touboul Nathane
Copyright (C) 2019 Thierry HUCHARD <thierry@ordissimo.com>
This file is part of the SANE package.
SANE is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
SANE is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with sane; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
This file implements a SANE backend for eSCL scanners. */
#define DEBUG_DECLARE_ONLY
#include "../include/sane/config.h"
#include "escl.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include <libxml/parser.h>
struct idle
{
char *memory;
size_t size;
};
/**
* \fn static size_t memory_callback_s(void *contents, size_t size, size_t nmemb, void *userp)
* \brief Callback function that stocks in memory the content of the scanner status.
*
* \return realsize (size of the content needed -> the scanner status)
*/
static size_t
memory_callback_s(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
struct idle *mem = (struct idle *)userp;
char *str = realloc(mem->memory, mem->size + realsize + 1);
if (str == NULL) {
DBG(1, "not enough memory (realloc returned NULL)\n");
return (0);
}
mem->memory = str;
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size = mem->size + realsize;
mem->memory[mem->size] = 0;
return (realsize);
}
/**
* \fn static int find_nodes_s(xmlNode *node)
* \brief Function that browses the xml file and parses it, to find the xml children node.
* --> to recover the scanner status.
*
* \return 0 if a xml child node is found, 1 otherwise
*/
static int
find_nodes_s(xmlNode *node)
{
xmlNode *child = node->children;
while (child) {
if (child->type == XML_ELEMENT_NODE)
return (0);
child = child->next;
}
return (1);
}
/**
* \fn static void print_xml_s(xmlNode *node, SANE_Status *status)
* \brief Function that browses the xml file, node by node.
* If the node 'State' is found, we are expecting to found in this node the 'Idle'
* content (if the scanner is ready to use) and then 'status' = SANE_STATUS_GOOD.
* Otherwise, this means that the scanner isn't ready to use.
*/
static void
print_xml_s(xmlNode *node, SANE_Status *status)
{
int x = 0;
while (node) {
if (node->type == XML_ELEMENT_NODE) {
if (find_nodes_s(node)) {
if (strcmp((const char *)node->name, "State") == 0)
x = 1;
}
if (x == 1 && strcmp((const char *)xmlNodeGetContent(node), "Idle") == 0)
*status = SANE_STATUS_GOOD;
}
print_xml_s(node->children, status);
node = node->next;
}
}
/**
* \fn SANE_Status escl_status(SANE_String_Const name)
* \brief Function that finally recovers the scanner status ('Idle', or not), using curl.
* This function is called in the 'sane_open' function and it's the equivalent of
* the following curl command : "curl http(s)://'ip':'port'/eSCL/ScannerStatus".
*
* \return status (if everything is OK, status = SANE_STATUS_GOOD, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
*/
SANE_Status
escl_status(SANE_String_Const name)
{
SANE_Status status;
CURL *curl_handle = NULL;
struct idle *var = NULL;
xmlDoc *data = NULL;
xmlNode *node = NULL;
const char *scanner_status = "/eSCL/ScannerStatus";
char tmp[PATH_MAX] = { 0 };
if (name == NULL)
return (SANE_STATUS_NO_MEM);
var = (struct idle*)calloc(1, sizeof(struct idle));
if (var == NULL)
return (SANE_STATUS_NO_MEM);
var->memory = malloc(1);
var->size = 0;
curl_handle = curl_easy_init();
strcpy(tmp, name);
strcat(tmp, scanner_status);
curl_easy_setopt(curl_handle, CURLOPT_URL, tmp);
DBG( 1, "Get Status : %s.\n", tmp);
if (strncmp(name, "https", 5) == 0) {
DBG( 1, "Ignoring safety certificates, use https\n");
curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYHOST, 0L);
}
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, memory_callback_s);
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)var);
if (curl_easy_perform(curl_handle) != CURLE_OK) {
DBG( 1, "The scanner didn't respond.\n");
status = SANE_STATUS_INVAL;
goto clean_data;
}
data = xmlReadMemory(var->memory, var->size, "file.xml", NULL, 0);
if (data == NULL) {
status = SANE_STATUS_NO_MEM;
goto clean_data;
}
node = xmlDocGetRootElement(data);
if (node == NULL) {
status = SANE_STATUS_NO_MEM;
goto clean;
}
status = SANE_STATUS_DEVICE_BUSY;
print_xml_s(node, &status);
clean:
xmlFreeDoc(data);
clean_data:
xmlCleanupParser();
xmlMemoryDump();
curl_easy_cleanup(curl_handle);
free(var->memory);
free(var);
return (status);
}
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