/*
* 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. 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <arpa/inet.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 &&
ntohs(reply->operation) == IPX_SAP_NEAREST_RESPONSE)
break;
if (len < 0)
packets--;
} while (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;
}
