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