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Diffstat (limited to 'backend/channel-net.c')
| -rw-r--r-- | backend/channel-net.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/backend/channel-net.c b/backend/channel-net.c new file mode 100644 index 0000000..38439fd --- /dev/null +++ b/backend/channel-net.c @@ -0,0 +1,242 @@ +/* channel_net.c -- network device communication channel + * Copyright (C) 2008, 2009 SEIKO EPSON CORPORATION + * + * License: GPLv2+|iscan + * Authors: AVASYS CORPORATION + * + * This file is part of the SANE backend distributed with Image Scan! + * + * Image Scan!'s SANE backend 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 2 of the License or at your option any later version. + * + * This program 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 ought to have received a copy of the GNU General Public License + * along with this package. If not, see <http://www.gnu.org/licenses/>. + * + * + * Linking Image Scan!'s SANE backend statically or dynamically with + * other modules is making a combined work based on this SANE backend. + * Thus, the terms and conditions of the GNU General Public License + * cover the whole combination. + * + * As a special exception, the copyright holders of Image Scan!'s SANE + * backend give you permission to link Image Scan!'s SANE backend with + * SANE frontends that communicate with Image Scan!'s SANE backend + * solely through the SANE Application Programming Interface, + * regardless of the license terms of these SANE frontends, and to + * copy and distribute the resulting combined work under terms of your + * choice, provided that every copy of the combined work is + * accompanied by a complete copy of the source code of Image Scan!'s + * SANE backend (the version of Image Scan!'s SANE backend used to + * produce the combined work), being distributed under the terms of + * the GNU General Public License plus this exception. An independent + * module is a module which is not derived from or based on Image + * Scan!'s SANE backend. + * + * As a special exception, the copyright holders of Image Scan!'s SANE + * backend give you permission to link Image Scan!'s SANE backend with + * independent modules that communicate with Image Scan!'s SANE + * backend solely through the "Interpreter" interface, regardless of + * the license terms of these independent modules, and to copy and + * distribute the resulting combined work under terms of your choice, + * provided that every copy of the combined work is accompanied by a + * complete copy of the source code of Image Scan!'s SANE backend (the + * version of Image Scan!'s SANE backend used to produce the combined + * work), being distributed under the terms of the GNU General Public + * License plus this exception. An independent module is a module + * which is not derived from or based on Image Scan!'s SANE backend. + * + * Note that people who make modified versions of Image Scan!'s SANE + * backend are not obligated to grant special exceptions for their + * modified versions; it is their choice whether to do so. The GNU + * General Public License gives permission to release a modified + * version without this exception; this exception also makes it + * possible to release a modified version which carries forward this + * exception. + */ + + +/*! \file + * \brief Implements a network device communication channel. + * \todo Deal correctly with \c SIGPIPE. + */ + + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "channel.h" + +#include <string.h> +#include <unistd.h> + +#include "ipc.h" +#include "net-obj.h" +#include "utils.h" +#include "hw-data.h" + + +static void channel_net_open (channel *, SANE_Status *); +static void channel_net_close (channel *, SANE_Status *); + +static ssize_t channel_net_send (channel *, const void *, + size_t, SANE_Status *); +static ssize_t channel_net_recv (channel *, void *, + size_t, SANE_Status *); + + +channel * +channel_net_ctor (channel *self, const char *dev_name, SANE_Status *status) +{ + log_call ("(%p, '%s', %p)", self, dev_name, status); + + if (status) *status = SANE_STATUS_GOOD; + + require (self && dev_name); + require (0 == strncmp_c (dev_name, "net:", strlen ("net:"))); + + self->name = strdup (dev_name); + if (!self->name) + { + if (status) *status = SANE_STATUS_NO_MEM; + return self->dtor (self); + } + + self->open = channel_net_open; + self->close = channel_net_close; + + self->send = channel_net_send; + self->recv = channel_net_recv; + + return self; +} + +/*! Each call must consist of a complete handshake step. + * Cannot send in parts. + */ +static ssize_t +channel_net_send (channel *self, const void *buffer, + size_t size, SANE_Status *status) +{ + ssize_t n = 0; + if (0 > self->fd) + { + if (status) *status = SANE_STATUS_IO_ERROR; + return -1; + } + if (status) *status = SANE_STATUS_GOOD; + + require (self && buffer); + require (0 < self->id); + + n = ipc_send (self->fd, self->id, TYPE_ESC, size, buffer); + if (n != size) + { + if (status) *status = SANE_STATUS_IO_ERROR; + } + return n; +} + +/*! Each call must consist of a complete handshake step. + * Cannot receive in parts. + */ +static ssize_t +channel_net_recv (channel *self, void *buffer, + size_t size, SANE_Status *status) +{ + char* rbuf = NULL; + uint16_t id = 0; + uint8_t ipc_status = STATUS_OK; + ssize_t n = 0; + + if (0 > self->fd) + { + if (status) *status = SANE_STATUS_IO_ERROR; + return -1; + } + if (status) *status = SANE_STATUS_GOOD; + + require (self && buffer); + require (0 < self->id); + + n = ipc_recv (self->fd, &id, &ipc_status, (void**)&rbuf); + if (n != size) err_major ("expected %zd bytes, received %zd bytes", size, n); + if (!rbuf || id != self->id || STATUS_OK != ipc_status || n != size) + { + if (status) *status = SANE_STATUS_IO_ERROR; + delete (rbuf); + return -1; + } + + memcpy (buffer, rbuf, n); + delete (rbuf); + return n; +} + +static void +channel_net_open (channel *self, SANE_Status *status) +{ + void* net = NULL; + ssize_t n = 0; + + uint8_t ipc_status = STATUS_OK; + + char* scanner = self->name + strlen ("net:"); + + if (status) *status = SANE_STATUS_GOOD; + + net = net_init ("", NULL); + if (net) self->fd = net_get_sock (net); + if (!net || 0 > self->fd) + { + if (status) *status = SANE_STATUS_IO_ERROR; + return; + } + + n = ipc_send (self->fd, 0, TYPE_OPEN, strlen (scanner), scanner); + if (n != strlen (scanner)) + { + self->fd = -1; + if (status) *status = SANE_STATUS_IO_ERROR; + return; + } + + n = ipc_recv (self->fd, &self->id, &ipc_status, NULL); + + if (STATUS_OK != ipc_status || 0 != n) + { + self->id = 0; + self->fd = -1; + if (status) *status = SANE_STATUS_IO_ERROR; + return; + } + + log_info ("Opened network scanner at: %s", scanner); +} + +static void +channel_net_close (channel *self, SANE_Status *status) +{ + ssize_t n = 0; + + if (status) *status = SANE_STATUS_GOOD; + + n = ipc_send (self->fd, self->id, TYPE_CLOSE, 0, NULL); + self->id = 0; + self->fd = -1; + if (0 != n) + { + if (status) *status = SANE_STATUS_IO_ERROR; + log_info ("failed to close network scanner: %s", + self->name + strlen ("net:")); + return; + } + log_info ("closed network scanner: %s", self->name + strlen ("net:")); +} |