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sane-project-backends/backend/escl/escl_newjob.c

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8.7 KiB
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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>
#ifdef PATH_MAX
# undef PATH_MAX
#endif
#define PATH_MAX 4096
struct uploading
{
const char *read_data;
size_t size;
};
struct downloading
{
char *memory;
size_t size;
};
static const char settings[] =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" \
"<scan:ScanSettings xmlns:pwg=\"http://www.pwg.org/schemas/2010/12/sm\" xmlns:scan=\"http://schemas.hp.com/imaging/escl/2011/05/03\">" \
" <pwg:Version>2.0</pwg:Version>" \
" <pwg:ScanRegions>" \
" <pwg:ScanRegion>" \
" <pwg:ContentRegionUnits>escl:ThreeHundredthsOfInches</pwg:ContentRegionUnits>" \
" <pwg:Height>%d</pwg:Height>" \
" <pwg:Width>%d</pwg:Width>" \
" <pwg:XOffset>%d</pwg:XOffset>" \
" <pwg:YOffset>%d</pwg:YOffset>" \
" </pwg:ScanRegion>" \
" </pwg:ScanRegions>" \
" <pwg:DocumentFormat>%s</pwg:DocumentFormat>" \
"%s" \
" <scan:ColorMode>%s</scan:ColorMode>" \
" <scan:XResolution>%d</scan:XResolution>" \
" <scan:YResolution>%d</scan:YResolution>" \
" <pwg:InputSource>Platen</pwg:InputSource>" \
"</scan:ScanSettings>";
static char formatExtJPEG[] =
" <scan:DocumentFormatExt>image/jpeg</scan:DocumentFormatExt>";
static char formatExtPNG[] =
" <scan:DocumentFormatExt>image/png</scan:DocumentFormatExt>";
static char formatExtTIFF[] =
" <scan:DocumentFormatExt>image/tiff</scan:DocumentFormatExt>";
/**
* \fn static size_t download_callback(void *str, size_t size, size_t nmemb, void *userp)
* \brief Callback function that stocks in memory the content of the 'job'. Example below :
* "Trying 192.168.14.150...
* TCP_NODELAY set
* Connected to 192.168.14.150 (192.168.14.150) port 80
* POST /eSCL/ScanJobs HTTP/1.1
* Host: 192.168.14.150
* User-Agent: curl/7.55.1
* Accept: /
* Content-Length: 605
* Content-Type: application/x-www-form-urlencoded
* upload completely sent off: 605 out of 605 bytes
* < HTTP/1.1 201 Created
* < MIME-Version: 1.0
* < Location: http://192.168.14.150/eSCL/ScanJobs/22b54fd0-027b-1000-9bd0-f4a99726e2fa
* < Content-Length: 0
* < Connection: close
* <
* Closing connection 0"
*
* \return realsize (size of the content needed -> the 'job')
*/
static size_t
download_callback(void *str, size_t size, size_t nmemb, void *userp)
{
struct downloading *download = (struct downloading *)userp;
size_t realsize = size * nmemb;
char *content = realloc(download->memory, download->size + realsize + 1);
if (content == NULL) {
DBG( 1, "Not enough memory (realloc returned NULL)\n");
return (0);
}
download->memory = content;
memcpy(&(download->memory[download->size]), str, realsize);
download->size = download->size + realsize;
download->memory[download->size] = 0;
return (realsize);
}
/**
* \fn char *escl_newjob (capabilities_t *scanner, SANE_String_Const name, SANE_Status *status)
* \brief Function that, using curl, uploads the data (composed by the scanner capabilities) to the
* server to download the 'job' and recover the 'new job' (char *result), in LOCATION.
* This function is called in the 'sane_start' function and it's the equivalent of the
* following curl command : "curl -v POST -d cap.xml http(s)://'ip':'port'/eSCL/ScanJobs".
*
* \return result (the 'new job', situated in LOCATION)
*/
char *
escl_newjob (capabilities_t *scanner, SANE_String_Const name, SANE_Status *status)
{
CURL *curl_handle = NULL;
struct uploading *upload = NULL;
struct downloading *download = NULL;
const char *scan_jobs = "/eSCL/ScanJobs";
char cap_data[PATH_MAX] = { 0 };
char job_cmd[PATH_MAX] = { 0 };
char *location = NULL;
char *result = NULL;
char *temporary = NULL;
char *f_ext = "";
char *format_ext = NULL;
*status = SANE_STATUS_GOOD;
if (name == NULL || scanner == NULL) {
*status = SANE_STATUS_NO_MEM;
DBG( 1, "Create NewJob : the name or the scan are invalid.\n");
return (NULL);
}
upload = (struct uploading *)calloc(1, sizeof(struct uploading));
if (upload == NULL) {
*status = SANE_STATUS_NO_MEM;
DBG( 1, "Create NewJob : memory allocation failure\n");
return (NULL);
}
download = (struct downloading *)calloc(1, sizeof(struct downloading));
if (download == NULL) {
free(upload);
DBG( 1, "Create NewJob : memory allocation failure\n");
*status = SANE_STATUS_NO_MEM;
return (NULL);
}
curl_handle = curl_easy_init();
if (scanner->format_ext == 1)
{
if (!strcmp(scanner->default_format, "image/jpeg"))
format_ext = formatExtJPEG;
else if (!strcmp(scanner->default_format, "image/png"))
format_ext = formatExtPNG;
else if (!strcmp(scanner->default_format, "image/tiff"))
format_ext = formatExtTIFF;
else
format_ext = f_ext;
}
else
format_ext = f_ext;
DBG( 1, "Create NewJob : %s\n", scanner->default_format);
if (curl_handle != NULL) {
snprintf(cap_data, sizeof(cap_data), settings, scanner->height, scanner->width, 0, 0, scanner->default_format,
format_ext,
scanner->default_color, scanner->default_resolution, scanner->default_resolution);
DBG( 1, "Create NewJob : %s\n", cap_data);
upload->read_data = strdup(cap_data);
upload->size = strlen(cap_data);
download->memory = malloc(1);
download->size = 0;
strcpy(job_cmd, name);
strcat(job_cmd, scan_jobs);
curl_easy_setopt(curl_handle, CURLOPT_URL, job_cmd);
if (strncmp(name, "https", 5) == 0) {
curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYHOST, 0L);
}
curl_easy_setopt(curl_handle, CURLOPT_POST, 1L);
curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDS, upload->read_data);
curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDSIZE, upload->size);
curl_easy_setopt(curl_handle, CURLOPT_HEADERFUNCTION, download_callback);
curl_easy_setopt(curl_handle, CURLOPT_HEADERDATA, (void *)download);
if (curl_easy_perform(curl_handle) != CURLE_OK) {
DBG( 1, "Create NewJob : the scanner responded incorrectly.\n");
*status = SANE_STATUS_INVAL;
}
else {
if (download->memory != NULL) {
if (strstr(download->memory, "Location:")) {
temporary = strrchr(download->memory, '/');
if (temporary != NULL) {
location = strchr(temporary, '\r');
if (location == NULL)
location = strchr(temporary, '\n');
else {
*location = '\0';
result = strdup(temporary);
}
DBG( 1, "Create NewJob : %s\n", result);
}
free(download->memory);
}
else {
DBG( 1, "Create NewJob : The creation of the failed job\n");
*status = SANE_STATUS_INVAL;
}
}
else {
*status = SANE_STATUS_NO_MEM;
DBG( 1, "Create NewJob : The creation of the failed job\n");
return (NULL);
}
}
curl_easy_cleanup(curl_handle);
}
if (upload != NULL)
free(upload);
if (download != NULL)
free(download);
return (result);
}
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