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

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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, see <https://www.gnu.org/licenses/>.
This file implements a SANE backend for eSCL scanners. */
#define DEBUG_DECLARE_ONLY
#include "../include/sane/config.h"
#include "escl.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <avahi-client/lookup.h>
#include <avahi-common/error.h>
#include <avahi-common/simple-watch.h>
#include "../include/sane/sanei.h"
static AvahiSimplePoll *simple_poll = NULL;
static int count_finish = 0;
/**
* \fn static void resolve_callback(AvahiServiceResolver *r, AVAHI_GCC_UNUSED
* AvahiIfIndex interface, AVAHI_GCC_UNUSED AvahiProtocol protocol,
* AvahiResolverEvent event, const char *name,
* const char *type, const char *domain, const char *host_name,
* const AvahiAddress *address, uint16_t port,
* AvahiStringList *txt, AvahiLookupResultFlags flags,
* void *userdata)
* \brief Callback function that will check if the selected scanner follows the escl
* protocol or not.
*/
static void
resolve_callback(AvahiServiceResolver *r, AVAHI_GCC_UNUSED AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiResolverEvent event,
const char *name,
const char __sane_unused__ *type,
const char __sane_unused__ *domain,
const char __sane_unused__ *host_name,
const AvahiAddress *address,
uint16_t port,
AvahiStringList *txt,
AvahiLookupResultFlags __sane_unused__ flags,
void __sane_unused__ *userdata)
{
char a[(AVAHI_ADDRESS_STR_MAX + 10)] = { 0 };
char *t;
const char *is;
const char *uuid;
AvahiStringList *s;
assert(r);
switch (event) {
case AVAHI_RESOLVER_FAILURE:
break;
case AVAHI_RESOLVER_FOUND:
{
char *psz_addr = ((void*)0);
char b[128] = { 0 };
avahi_address_snprint(b, (sizeof(b)/sizeof(b[0]))-1, address);
#ifdef ENABLE_IPV6
if (protocol == AVAHI_PROTO_INET6 && strchr(b, ':'))
{
if ( asprintf( &psz_addr, "[%s]", b ) == -1 )
break;
}
else
#endif
{
if ( asprintf( &psz_addr, "%s", b ) == -1 )
break;
}
t = avahi_string_list_to_string(txt);
if (strstr(t, "\"rs=eSCL\"") || strstr(t, "\"rs=/eSCL\"")) {
s = avahi_string_list_find(txt, "is");
if (s && s->size > 3)
is = (const char*)s->text + 3;
else
is = (const char*)NULL;
s = avahi_string_list_find(txt, "uuid");
if (s && s->size > 5)
uuid = (const char*)s->text + 5;
else
uuid = (const char*)NULL;
DBG (10, "resolve_callback [%s]\n", a);
if (strstr(psz_addr, "127.0.0.1") != NULL) {
escl_device_add(port, name, "localhost", is, uuid, (char*)type);
DBG (10,"resolve_callback fix redirect [localhost]\n");
}
else
escl_device_add(port, name, psz_addr, is, uuid, (char*)type);
}
}
}
}
/**
* \fn static void browse_callback(AvahiServiceBrowser *b, AvahiIfIndex interface,
* AvahiProtocol protocol, AvahiBrowserEvent event, const char *name,
* const char *type, const char *domain,
* AVAHI_GCC_UNUSED AvahiLookupResultFlags flags, void* userdata)
* \brief Callback function that will browse tanks to 'avahi' the scanners
* connected in network.
*/
static void
browse_callback(AvahiServiceBrowser *b, AvahiIfIndex interface,
AvahiProtocol protocol, AvahiBrowserEvent event,
const char *name, const char *type,
const char *domain,
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
void* userdata)
{
AvahiClient *c = userdata;
assert(b);
switch (event) {
case AVAHI_BROWSER_FAILURE:
avahi_simple_poll_quit(simple_poll);
return;
case AVAHI_BROWSER_NEW:
if (!(avahi_service_resolver_new(c, interface, protocol, name,
type, domain,
AVAHI_PROTO_UNSPEC, 0,
resolve_callback, c)))
break;
case AVAHI_BROWSER_REMOVE:
break;
case AVAHI_BROWSER_ALL_FOR_NOW:
case AVAHI_BROWSER_CACHE_EXHAUSTED:
if (event != AVAHI_BROWSER_CACHE_EXHAUSTED)
{
count_finish++;
if (count_finish == 2)
avahi_simple_poll_quit(simple_poll);
}
break;
}
}
/**
* \fn static void client_callback(AvahiClient *c, AvahiClientState state,
* AVAHI_GCC_UNUSED void *userdata)
* \brief Callback Function that quit if it doesn't find a connected scanner,
* possible thanks the "Hello Protocol".
* --> Waiting for a answer by the scanner to continue the avahi process.
*/
static void
client_callback(AvahiClient *c, AvahiClientState state,
AVAHI_GCC_UNUSED void *userdata)
{
assert(c);
if (state == AVAHI_CLIENT_FAILURE)
avahi_simple_poll_quit(simple_poll);
}
/**
* \fn ESCL_Device *escl_devices(SANE_Status *status)
* \brief Function that calls all the avahi functions and then, recovers the
* connected eSCL devices.
* This function is called in the 'sane_get_devices' function.
*
* \return NULL (the eSCL devices found)
*/
ESCL_Device *
escl_devices(SANE_Status *status)
{
AvahiClient *client = NULL;
AvahiServiceBrowser *sb = NULL;
int error;
count_finish = 0;
*status = SANE_STATUS_GOOD;
if (!(simple_poll = avahi_simple_poll_new())) {
DBG( 1, "Failed to create simple poll object.\n");
*status = SANE_STATUS_INVAL;
goto fail;
}
client = avahi_client_new(avahi_simple_poll_get(simple_poll), 0,
client_callback, NULL, &error);
if (!client) {
DBG( 1, "Failed to create client: %s\n", avahi_strerror(error));
*status = SANE_STATUS_INVAL;
goto fail;
}
if (!(sb = avahi_service_browser_new(client, AVAHI_IF_UNSPEC,
AVAHI_PROTO_UNSPEC, "_uscan._tcp",
NULL, 0, browse_callback, client))) {
DBG( 1, "Failed to create service browser: %s\n",
avahi_strerror(avahi_client_errno(client)));
*status = SANE_STATUS_INVAL;
goto fail;
}
if (!(sb = avahi_service_browser_new(client, AVAHI_IF_UNSPEC,
AVAHI_PROTO_UNSPEC,
"_uscans._tcp", NULL, 0,
browse_callback, client))) {
DBG( 1, "Failed to create service browser: %s\n",
avahi_strerror(avahi_client_errno(client)));
*status = SANE_STATUS_INVAL;
goto fail;
}
avahi_simple_poll_loop(simple_poll);
fail:
if (sb)
avahi_service_browser_free(sb);
if (client)
avahi_client_free(client);
if (simple_poll)
avahi_simple_poll_free(simple_poll);
return (NULL);
}
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