added udp support functions

include/sane/sanei_udp.h

@@ -0,0 +1,34 @@
+/* sane - Scanner Access Now Easy.
+ * Copyright (C) 2007 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ * This file is part of the SANE package.
+ *
+ * This file is in the public domain.  You may use and modify it as
+ * you see fit, as long as this copyright message is included and
+ * that there is an indication as to what modifications have been
+ * made (if any).
+ *
+ * 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.
+ *
+ * Header file for UDP/IP communications. 
+ */
+
+#ifndef sanei_udp_h
+#define sanei_udp_h
+
+#include <sane/sane.h>
+
+#include <netinet/in.h>
+#include <netdb.h>
+
+extern SANE_Status sanei_udp_open(const char *host, int port, int *fdp);
+extern SANE_Status sanei_udp_open_broadcast(int *fdp);
+extern void sanei_udp_close(int fd);
+extern ssize_t sanei_udp_write(int fd, const u_char * buf, int count);
+extern ssize_t sanei_udp_read(int fd, u_char * buf, int count);
+extern ssize_t sanei_udp_write_broadcast(int fd, int port, const u_char * buf, int count);
+extern ssize_t sanei_udp_recvfrom(int fd, u_char * buf, int count, char **fromp);
+
+#endif /* sanei_udp_h */

sanei/Makefile.in

@@ -52,14 +52,14 @@ LIBSANEI_OBJS = sanei_ab306.o sanei_constrain_value.o sanei_init_debug.o \
 	sanei_net.o sanei_wire.o sanei_codec_ascii.o sanei_codec_bin.o \
 	sanei_scsi.o sanei_config.o sanei_config2.o sanei_pio.o sanei_pa4s2.o \
 	sanei_auth.o sanei_usb.o sanei_thread.o sanei_pv8630.o sanei_pp.o \
-	sanei_lm983x.o sanei_access.o @SANEI_JPEG@ sanei_tcp.o
+	sanei_lm983x.o sanei_access.o @SANEI_JPEG@ sanei_tcp.o sanei_udp.o
 
 LIBSANEI_LTOBJS = sanei_ab306.lo sanei_constrain_value.lo sanei_init_debug.lo \
 	sanei_net.lo sanei_wire.lo sanei_codec_ascii.lo sanei_codec_bin.lo \
 	sanei_scsi.lo sanei_config.lo sanei_config2.lo sanei_pio.lo \
 	sanei_pa4s2.lo sanei_auth.lo sanei_usb.lo sanei_thread.lo \
 	sanei_pv8630.lo sanei_lm983x.lo sanei_pp.lo sanei_access.lo @SANEI_JPEG_LO@ \
-	sanei_tcp.lo
+	sanei_tcp.lo sanei_udp.lo
 
 TARGETS = libsanei.a $(LIBSANEI_LTOBJS)
 TESTPROGRAMS = test_wire
@@ -70,7 +70,7 @@ DISTFILES = Makefile.in linux_sg3_err.h os2_srb.h sanei_DomainOS.c \
   sanei_constrain_value.c sanei_init_debug.c sanei_jpeg.c \
   sanei_net.c sanei_pa4s2.c sanei_pio.c sanei_pv8630.c sanei_lm983x.c \
   sanei_scsi.c sanei_thread.c sanei_usb.c sanei_pp.c \
-  sanei_wire.c test_wire.c sanei_access.c sanei_tcp.c
+  sanei_wire.c test_wire.c sanei_access.c sanei_tcp.c sanei_udp.c
 
 .PHONY: all check clean depend dist distclean install uninstall
 

sanei/sanei_udp.c

@@ -0,0 +1,196 @@
+/* sane - Scanner Access Now Easy.
+   Copyright (C) 2006 Tower Technologies
+   Author: Alessandro Zummo <a.zummo@towertech.it>
+   This file is part of the SANE package.
+
+   This program 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 should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.  */
+
+#include "../include/sane/config.h"
+
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+
+#define BACKEND_NAME sanei_udp
+
+#include "../include/sane/sane.h"
+#include "../include/sane/sanei_debug.h"
+#include "../include/sane/sanei_udp.h"
+
+static SANE_Status
+sanei_udp_socket(int *fdp, int broadcast)
+{
+	int fd;
+
+	if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
+		return SANE_STATUS_INVAL;
+
+	if (broadcast) {
+		int opt = 1;
+		if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
+			       (char *) &opt, sizeof(opt)) < 0) {
+			close(fd);
+			return SANE_STATUS_INVAL;
+		}
+	}
+
+	*fdp = fd;
+
+	return SANE_STATUS_GOOD;
+}
+
+static SANE_Status
+sanei_udp_connect(int fd, const char *host, int port)
+{
+	int err;
+	struct sockaddr_in saddr;
+	struct hostent *h;
+
+	h = gethostbyname(host);
+
+	if (h == NULL || h->h_addr_list[0] == NULL
+	    || h->h_addrtype != AF_INET)
+		return SANE_STATUS_INVAL;
+
+	memset(&saddr, 0x00, sizeof(struct sockaddr_in));
+
+	saddr.sin_family = AF_INET;
+	saddr.sin_port = htons(port);
+	memcpy(&saddr.sin_addr, h->h_addr_list[0], h->h_length);
+
+	if ((err = connect(fd, (struct sockaddr *) &saddr,
+		     sizeof(struct sockaddr_in))) != 0) {
+		return SANE_STATUS_INVAL;
+	}
+
+	return SANE_STATUS_GOOD;
+}
+
+SANE_Status
+sanei_udp_open(const char *host, int port, int *fdp)
+{
+	int status;
+
+	DBG_INIT();
+	DBG(1, "%s\n", __func__);
+
+	status = sanei_udp_socket(fdp, 0);
+	if (status != SANE_STATUS_GOOD)
+		return status;
+
+	status = sanei_udp_connect(*fdp, host, port);
+	if (status != SANE_STATUS_GOOD) {
+		close(*fdp);
+		return status;
+	}
+
+	return status;
+}
+
+SANE_Status
+sanei_udp_open_broadcast(int *fdp)
+{
+	int status;
+
+	DBG_INIT();
+	DBG(1, "%s\n", __func__);
+
+	status = sanei_udp_socket(fdp, 1);
+	if (status != SANE_STATUS_GOOD)
+		return status;
+
+	return status;
+}
+
+void
+sanei_udp_close(int fd)
+{
+	close(fd);
+}
+
+ssize_t
+sanei_udp_write(int fd, const u_char * buf, int count)
+{
+	return send(fd, buf, count, 0);
+}
+
+ssize_t
+sanei_udp_write_broadcast(int fd, int port, const u_char * buf, int count)
+{
+	struct sockaddr_in saddr;
+
+	memset(&saddr, 0x00, sizeof(struct sockaddr_in));
+
+	saddr.sin_family = AF_INET;
+	saddr.sin_port = htons(port);
+	saddr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
+
+	return sendto(fd, buf, count, 0,
+		(struct sockaddr *)&saddr, sizeof(saddr));
+}
+
+ssize_t
+sanei_udp_read(int fd, u_char * buf, int count)
+{
+	return recv(fd, buf, count, MSG_WAITALL);
+}
+
+ssize_t
+sanei_udp_recvfrom(int fd, u_char * buf, int count, char **fromp)
+{
+	ssize_t l;
+	socklen_t fl;
+	struct sockaddr_in from;
+
+	fl = sizeof(from);
+
+	l = recvfrom(fd, buf, count, MSG_DONTWAIT,
+		(struct sockaddr *) &from, &fl);
+
+	if (l > 0 && fromp) {
+		*fromp = inet_ntoa(from.sin_addr);
+	}
+
+	return l;
+}
+