Initial import of ncp library sources.

Reviewed by:	jdp, mdodd

1 files changed, 302 insertions, 0 deletions

diff --git a/lib/libncp/sap.c b/lib/libncp/sap.c
new file mode 100644
index 0000000..32e0ab2
--- /dev/null
+++ b/lib/libncp/sap.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 1999, Boris Popov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by Boris Popov.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netipx/ipx.h>
+#include <errno.h>
+#include <unistd.h>
+#include "ipxsap.h"
+
+/*
+ * TODO: These should go to ipx headers
+ */
+#define ipx_set_net(x,y) ((x).x_net.s_net[0] = (y).x_net.s_net[0]); \
+			 ((x).x_net.s_net[1]=(y).x_net.s_net[1])
+#define ipx_set_nullnet(x) ((x).x_net.s_net[0]=0); ((x).x_net.s_net[1]=0)
+#define ipx_set_nullhost(x) ((x).x_host.s_host[0] = 0); \
+	((x).x_host.s_host[1] = 0); ((x).x_host.s_host[2] = 0)
+#define ipx_set_wildnet(x)	((x).x_net.s_net[0] = 0xFFFF); \
+				((x).x_net.s_net[1]=0xFFFF)
+#define ipx_set_wildhost(x) ((x).x_host.s_host[0] = 0xFFFF); \
+	((x).x_host.s_host[1] = 0xFFFF); ((x).x_host.s_host[2] = 0xFFFF);
+
+
+static struct sap_packet* sap_packet_alloc(int entries);
+static int sap_size(int entries, u_short operation);
+int (*sap_sendto_func)(void*,int,struct sockaddr_ipx*,int sock)=NULL;
+
+static int
+sap_sendto(void* buffer, int size, struct sockaddr_ipx* daddr, int sock)
+{ 
+	if (sap_sendto_func)
+		return sap_sendto_func(buffer,size,daddr,sock);
+	return sendto(sock, (char*)buffer, size, 0,
+	    (struct sockaddr*)daddr, sizeof(*daddr));
+}
+
+static struct sap_packet* 
+sap_packet_alloc(int entries)
+{
+	if (entries > IPX_SAP_MAX_ENTRIES)
+		return NULL;
+	return 
+	    (struct sap_packet*)malloc(sap_size(entries, IPX_SAP_GENERAL_RESPONSE));
+}
+
+static int 
+sap_size(int entries, u_short operation)
+{
+	if (entries <= 0)
+		return 0;
+	switch (operation) {
+	    case IPX_SAP_GENERAL_QUERY:
+    		return entries == 1 ? IPX_SAP_REQUEST_LEN : 0;
+	    case IPX_SAP_GENERAL_RESPONSE:
+        	if (entries > IPX_SAP_MAX_ENTRIES)
+			return 0;
+    		return sizeof(struct sap_packet) + (entries - 1) * sizeof(struct sap_entry);
+	    case IPX_SAP_NEAREST_QUERY:
+                return entries == 1 ? IPX_SAP_REQUEST_LEN : 0;
+	    case IPX_SAP_NEAREST_RESPONSE:
+        	return entries == 1 ? sizeof(struct sap_packet) : 0;
+	    default:
+        	return 0;	
+	}
+}
+
+void 
+sap_copyname(char *dest, const char *src)
+{
+	bzero(dest, IPX_SAP_SERVER_NAME_LEN);
+	strncpy(dest, src, IPX_SAP_SERVER_NAME_LEN - 1);
+}
+
+int
+sap_rq_init(struct sap_rq* rq, int sock)
+{
+	rq->buffer = sap_packet_alloc(IPX_SAP_MAX_ENTRIES);
+	if (rq->buffer == NULL)
+		return 0;
+	rq->entries = 0;
+	rq->buffer->operation = htons(IPX_SAP_GENERAL_QUERY);
+	rq->dest_addr.sipx_family = AF_IPX;
+	rq->dest_addr.sipx_len = sizeof(struct sockaddr_ipx);
+	rq->sock = sock;
+	return 1;
+}
+
+int
+sap_rq_flush(struct sap_rq* rq)
+{
+	int result;
+
+	if (rq->entries == 0)
+		return 0;
+	result = sap_sendto(rq->buffer, 
+		sap_size(rq->entries, ntohs(rq->buffer->operation)), 
+		&rq->dest_addr, rq->sock);
+	rq->entries = 0;
+	return result;
+}
+
+void
+sap_rq_general_query(struct sap_rq* rq, u_short ser_type)
+{
+	struct sap_entry* sep;
+
+	sap_rq_flush(rq);
+	rq->buffer->operation = htons(IPX_SAP_GENERAL_QUERY);
+	sep = rq->buffer->sap_entries + rq->entries++;
+	sep->server_type = htons(ser_type);
+}
+
+void
+sap_rq_gns_request(struct sap_rq* rq, u_short ser_type)
+{
+	struct sap_entry* sep;
+
+	sap_rq_flush(rq);
+	rq->buffer->operation = htons(IPX_SAP_NEAREST_QUERY);
+	sep = rq->buffer->sap_entries + rq->entries++;
+	sep->server_type = htons(ser_type);
+}
+
+void
+sap_rq_general_response(struct sap_rq* rq,u_short type,char *name,struct sockaddr_ipx* addr, u_short hops,int down_allow)
+{
+	struct sap_entry* sep;
+
+	if (hops >= IPX_SAP_SERVER_DOWN && !down_allow) return;
+	if (rq->entries >= IPX_SAP_MAX_ENTRIES)
+		sap_rq_flush(rq);
+	if (rq->buffer->operation != htons(IPX_SAP_GENERAL_RESPONSE)){
+		sap_rq_flush(rq);
+		rq->buffer->operation = htons(IPX_SAP_GENERAL_RESPONSE);
+	}
+	sep = rq->buffer->sap_entries + rq->entries;
+	sep->server_type = htons(type);
+	sap_copyname(sep->server_name, name);
+	memcpy(&sep->ipx, &addr->sipx_addr, sizeof(struct ipx_addr));
+	sep->hops = htons(hops);
+	rq->entries++;
+}
+
+void
+sap_rq_gns_response(struct sap_rq* rq,u_short type,char *name,struct sockaddr_ipx* addr,u_short hops)
+{
+	struct sap_entry* sep;
+
+	if (hops >= IPX_SAP_SERVER_DOWN) return;
+	sap_rq_flush(rq);
+	rq->buffer->operation = htons(IPX_SAP_NEAREST_RESPONSE);
+	sep = rq->buffer->sap_entries + rq->entries;
+	sep->server_type = htons(type);
+	sap_copyname(sep->server_name, name);
+	memcpy(&sep->ipx, &addr->sipx_addr, sizeof(struct ipx_addr));
+	sep->hops = htons(hops);
+	rq->entries++;
+}
+
+void
+sap_rq_set_destination(struct sap_rq* rq,struct ipx_addr *dest)
+{
+	sap_rq_flush(rq);
+	memcpy(&rq->dest_addr.sipx_addr,dest,sizeof(struct ipx_addr));
+}
+
+int
+sap_getsock(int *rsock) {
+	struct sockaddr_ipx sap_addr;
+	int opt, sock, slen;
+
+	sock = socket(AF_IPX, SOCK_DGRAM, 0);
+	if (sock < 0)
+		return (errno);
+	slen = sizeof(sap_addr);
+	bzero(&sap_addr, slen);
+	sap_addr.sipx_family = AF_IPX;
+	sap_addr.sipx_len = slen;
+	if (bind(sock, (struct sockaddr*)&sap_addr, slen) == -1) {
+		close(sock);
+		return(errno);
+	}
+	opt = 1;
+	if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &opt, sizeof(opt)) != 0){
+		close(sock);
+		return(errno);
+	}
+	*rsock = sock;
+	return(0);
+}
+
+static int
+sap_recv(int sock,void *buf,int len,int flags, int timeout){
+	fd_set rd, wr, ex;
+	struct timeval tv;
+	int result;
+
+	FD_ZERO(&rd);
+	FD_ZERO(&wr);
+	FD_ZERO(&ex);
+	FD_SET(sock, &rd);
+
+	tv.tv_sec = timeout;
+	tv.tv_usec = 0;
+
+	if ((result = select(sock + 1, &rd, &wr, &ex, &tv)) == -1) {
+		return result;
+	}
+	if (FD_ISSET(sock, &rd)) {
+		result = recv(sock, buf, len, flags);
+	} else {
+		errno = ETIMEDOUT;
+		result = -1;
+	}
+	return result;
+}
+
+int
+sap_find_nearest(int server_type, struct sockaddr_ipx *daddr, char *server_name)
+{
+	struct ipx_addr addr;
+	char data[1024];
+	int sock, error, packets, len;
+	struct sap_packet *reply = (struct sap_packet*)&data;
+	struct sap_rq sap_rq;
+	
+	error = sap_getsock(&sock);
+	if (error)
+		return error;
+	bzero(&addr, sizeof(addr));
+	/* BAD: we should enum all ifs (and nets ?) */
+	if (ipx_iffind(NULL, &addr) != 0) {
+		return (EPROTONOSUPPORT);
+	}
+	ipx_set_wildhost(addr);		
+	addr.x_port = htons(IPXPORT_SAP);
+
+	if (!sap_rq_init(&sap_rq, sock)) {
+		close(sock);
+		return(ENOMEM);
+	}
+	sap_rq_set_destination(&sap_rq, &addr);
+	sap_rq_gns_request(&sap_rq, server_type);
+	sap_rq_flush(&sap_rq);
+	packets = 5;
+	do {
+		len = sap_recv(sock, data, sizeof(data), 0, 1);
+		if (len < 66) {
+			packets++;
+			continue;
+		}
+	} while (ntohs(reply->operation) != IPX_SAP_NEAREST_RESPONSE &&
+		 packets > 0);
+
+	if (packets == 0) {
+		close(sock);
+		return ENETDOWN;
+	}
+
+	daddr->sipx_addr = reply->sap_entries[0].ipx;
+	daddr->sipx_family = AF_IPX;
+	daddr->sipx_len = sizeof(struct sockaddr_ipx);
+	sap_copyname(server_name, reply->sap_entries[0].server_name);
+	errno = 0;
+	close(sock);
+	return 0;
+}