Merge branch 'feature/upstream' into develop

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);
+}