summaryrefslogtreecommitdiff
path: root/backend/escl/escl_devices.c
diff options
context:
space:
mode:
authorJörg Frings-Fürst <debian@jff-webhosting.net>2020-02-02 17:14:32 +0100
committerJörg Frings-Fürst <debian@jff-webhosting.net>2020-02-02 17:14:32 +0100
commit5dadc28ea784db1ba1f56c2ea8618d2db67af1c8 (patch)
tree808b2499b54563b3290f34d70d159b1024310873 /backend/escl/escl_devices.c
parent5bb4cf12855ec0151de15d6c5a2354ff08766957 (diff)
parent3dade5db2a37543f19f0967901d8d80a52a1e459 (diff)
Merge branch 'feature/upstream' into develop
Diffstat (limited to 'backend/escl/escl_devices.c')
-rw-r--r--backend/escl/escl_devices.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/backend/escl/escl_devices.c b/backend/escl/escl_devices.c
new file mode 100644
index 0000000..7ecbe31
--- /dev/null
+++ b/backend/escl/escl_devices.c
@@ -0,0 +1,185 @@
+/* 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 <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.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;
+
+/**
+ * \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,
+ AVAHI_GCC_UNUSED 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], *t;
+ assert(r);
+ switch (event) {
+ case AVAHI_RESOLVER_FAILURE:
+ break;
+ case AVAHI_RESOLVER_FOUND:
+ avahi_address_snprint(a, sizeof(a), address);
+ t = avahi_string_list_to_string(txt);
+ if (strstr(t, "\"rs=eSCL\"") || strstr(t, "\"rs=/eSCL\""))
+ escl_device_add(port, name, a, (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)
+ 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;
+
+ *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);
+}