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ncpfs/lib/ncpext.c
ncpfs archive import b48389be22 Import ncpfs 2.2.5
2026-04-28 20:40:00 +02:00

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/*
ncpext.c
Copyright (C) 2001 Petr Vandrovec
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
Revision history:
1.00 2001, January 27 Petr Vandrovec <vandrove@vc.cvut.cz>
Initial version.
*/
#include <ncp/nwcalls.h>
#include <ncp/nwnet.h>
#include "ncplib_i.h"
#include "ncpcode.h"
#include <string.h>
#include <stdlib.h>
#define ncp_array_size(x) (sizeof(x)/sizeof((x)[0]))
NWCCODE
NWScanNCPExtensions(
NWCONN_HANDLE conn,
nuint32* iterHandle,
char* name,
nuint8* majorVersion,
nuint8* minorVersion,
nuint8* revision,
nuint8 queryData[32]) {
NWCCODE err;
if (!iterHandle) {
return NWE_PARAM_INVALID;
}
ncp_init_request_s(conn, 0);
ncp_add_dword_lh(conn, *iterHandle);
err = ncp_request(conn, 36);
if (err) {
ncp_unlock_conn(conn);
return err;
}
if (conn->ncp_reply_size < 72) {
ncp_unlock_conn(conn);
return NWE_INVALID_NCP_PACKET_LENGTH;
}
*iterHandle = ncp_reply_dword_lh(conn, 0);
if (majorVersion)
*majorVersion = ncp_reply_byte(conn, 4);
if (minorVersion)
*minorVersion = ncp_reply_byte(conn, 5);
if (revision)
*revision = ncp_reply_byte(conn, 6);
if (queryData)
memcpy(queryData, ncp_reply_data(conn, 40), 32);
if (name) {
size_t namelen;
namelen = ncp_reply_byte(conn, 7);
if (namelen >= MAX_NCP_EXTENSION_NAME_BYTES) {
ncp_unlock_conn(conn);
return NWE_BUFFER_OVERFLOW;
}
memcpy(name, ncp_reply_data(conn, 8), namelen);
name[namelen] = 0;
}
ncp_unlock_conn(conn);
return 0;
}
NWCCODE
NWGetNumberNCPExtensions(
NWCONN_HANDLE conn,
nuint* exts) {
NWCCODE err;
u_int32_t num;
NW_FRAGMENT rp;
u_int32_t iterHandle;
rp.fragAddr.rw = &num;
rp.fragSize = sizeof(num);
err = NWRequestSimple(conn, NCPC_SFN(36,3), NULL, 0, &rp);
if (err) {
if (err != NWE_NCP_NOT_SUPPORTED) {
return err;
}
iterHandle = ~0;
num = 0;
while ((err = NWScanNCPExtensions(conn, &iterHandle, NULL, NULL, NULL, NULL, NULL)) == 0) {
num++;
}
if (err != NWE_SERVER_FAILURE)
return err;
} else {
if (rp.fragSize < 4)
return NWE_INVALID_NCP_PACKET_LENGTH;
}
if (exts)
*exts = num;
return 0;
}
static NWCCODE
NWFragLen(size_t *total,
nuint cnt,
const NW_FRAGMENT* frag)
{
size_t len;
if (cnt && !frag) {
return ERR_NULL_POINTER;
}
len = 0;
while (cnt--) {
len += frag->fragSize;
frag++;
}
*total = len;
return 0;
}
typedef struct {
nuint8* current;
size_t space;
int currentActive;
nuint fragCount;
NW_FRAGMENT* fragList;
} NWFragger;
static void
NWPushFragStart(NWFragger* fragger,
nuint fragCount,
NW_FRAGMENT* fragList)
{
fragger->currentActive = 0;
fragger->fragCount = fragCount;
fragger->fragList = fragList;
}
static NWCCODE
NWPushFragPush(NWFragger* fragger,
const nuint8* data,
size_t len)
{
while (len) {
if (!fragger->currentActive) {
if (fragger->fragCount == 0) {
return NWE_BUFFER_OVERFLOW;
}
fragger->current = fragger->fragList->fragAddr.rw;
fragger->space = fragger->fragList->fragSize;
fragger->currentActive = 1;
}
if (len >= fragger->space) {
memcpy(fragger->current, data, fragger->space);
len -= fragger->space;
data += fragger->space;
fragger->fragList++;
fragger->fragCount--;
fragger->currentActive = 0;
} else {
memcpy(fragger->current, data, len);
fragger->current += len;
fragger->space -= len;
return 0;
}
}
return 0;
}
static void
NWPushFragFinish(NWFragger* fragger)
{
if (fragger->currentActive) {
fragger->fragList->fragSize -= fragger->space;
fragger->fragList++;
fragger->fragCount--;
}
while (fragger->fragCount--) {
fragger->fragList->fragSize = 0;
fragger->fragList++;
}
}
NWCCODE
NWFragNCPExtensionRequest(
NWCONN_HANDLE conn,
nuint32 NCPExtensionID,
nuint reqFragCount,
NW_FRAGMENT* reqFragList,
nuint replyFragCount,
NW_FRAGMENT* replyFragList)
{
NWCCODE err;
size_t reqLen;
size_t rpLen;
u_int16_t ver;
err = NWFragLen(&reqLen, reqFragCount, reqFragList);
if (err) {
return err;
}
err = NWFragLen(&rpLen, replyFragCount, replyFragList);
if (err) {
return err;
}
err = NWGetFileServerVersion(conn, &ver);
if (err) {
return err;
}
if (reqLen < 523 && rpLen < 530 && (rpLen < 100 || ver > 0x030B)) {
NW_FRAGMENT* rq;
NW_FRAGMENT rp[2];
u_int8_t rqhdr[8];
u_int8_t rphdr[2];
u_int8_t rpbuf[530];
NWFragger fragger;
rq = malloc(sizeof(NW_FRAGMENT) * (reqFragCount + 1));
if (!rq) {
return ERR_NOT_ENOUGH_MEMORY;
}
memcpy(rq + 1, reqFragList, sizeof(NW_FRAGMENT) * reqFragCount);
rq->fragAddress = rqhdr;
rq->fragSize = 8;
WSET_HL(rqhdr, 0, reqLen + 6);
DSET_LH(rqhdr, 2, NCPExtensionID);
WSET_LH(rqhdr, 6, rpLen);
rp[0].fragAddress = rphdr;
rp[0].fragSize = 2;
rp[1].fragAddress = rpbuf;
rp[1].fragSize = 530;
err = NWRequest(conn, 37, reqFragCount + 1, rq, 2, rp);
free(rq);
if (err) {
return err;
}
NWPushFragStart(&fragger, replyFragCount, replyFragList);
NWPushFragPush(&fragger, rpbuf, rp[1].fragSize);
NWPushFragFinish(&fragger);
return 0;
} else {
NW_FRAGMENT rq[2];
u_int8_t rqhdr[20];
u_int8_t rqbuf[519];
u_int8_t rphdr[10];
u_int8_t rpbuf[524];
size_t flen;
const u_int8_t* dptr;
size_t dlen;
NWFragger fragger;
WSET_HL(rqhdr, 0, 0xFFFF);
DSET_LH(rqhdr, 2, NCPExtensionID);
DSET_LH(rqhdr, 6, 0);
// WSET_LH(rqhdr, 10, 0); //472
DSET_LH(rqhdr, 12, reqLen);
DSET_LH(rqhdr, 16, rpLen);
rq[0].fragAddress = rqhdr;
rq[0].fragSize = 20;
flen = 511;
if (reqLen) {
dptr = reqFragList->fragAddr.ro;
dlen = reqFragList->fragSize;
reqFragList++;
} else {
dptr = NULL;
dlen = 0;
}
do {
NW_FRAGMENT rp[3];
rq[1].fragSize = 0;
if (reqLen) {
if (dlen >= flen) {
rq[1].fragAddr.ro = dptr;
rq[1].fragSize = flen;
dptr += flen;
dlen -= flen;
reqLen -= flen;
if (dlen == 0 && reqLen) {
dptr = reqFragList->fragAddress;
dlen = reqFragList->fragSize;
reqFragList++;
}
} else if (dlen == reqLen) {
rq[1].fragAddr.ro = dptr;
rq[1].fragSize = dlen;
reqLen = 0;
} else {
u_int8_t* pptr;
rq[1].fragAddress = pptr = rqbuf;
rq[1].fragSize = 0;
while (flen && reqLen) {
if (dlen > flen) {
memcpy(pptr, dptr, flen);
dptr += flen;
dlen -= flen;
rq[1].fragSize += flen;
reqLen -= flen;
break;
} else {
memcpy(pptr, dptr, dlen);
pptr += dlen;
flen -= dlen;
rq[1].fragSize += dlen;
reqLen -= dlen;
dptr = reqFragList->fragAddress;
dlen = reqFragList->fragSize;
reqFragList++;
}
}
}
}
WSET_LH(rqhdr, 10, rq[1].fragSize);
rp[0].fragAddress = rphdr;
rp[0].fragSize = 10;
rp[1].fragAddress = rpbuf;
rp[1].fragSize = sizeof(rpbuf);
err = NWRequest(conn, 37, 2, rq, 3, rp);
if (err) {
return err;
}
DSET_LH(rqhdr, 6, DVAL_LH(rphdr, 0));
rq[0].fragSize = 12;
flen = 519;
} while (reqLen);
{
size_t tlen = DVAL_LH(rphdr, 6);
if (rpLen > tlen) {
rpLen = tlen;
}
}
NWPushFragStart(&fragger, replyFragCount, replyFragList);
while (rpLen) {
size_t fragLen;
fragLen = WVAL_LH(rphdr, 4);
if (fragLen <= rpLen) {
rpLen -= fragLen;
} else {
fragLen = rpLen;
rpLen = 0;
}
err = NWPushFragPush(&fragger, rpbuf, fragLen);
if (err) {
return err;
}
if (rpLen) {
NW_FRAGMENT rp[2];
rp[0].fragAddress = rphdr;
rp[0].fragSize = 6;
rp[1].fragAddress = rpbuf;
rp[1].fragSize = sizeof(rpbuf);
err = NWRequest(conn, 37, 2, rq, 3, rp);
if (err) {
return err;
}
DSET_LH(rqhdr, 6, DVAL_LH(rphdr, 0));
}
}
NWPushFragFinish(&fragger);
}
return 0;
}
NWCCODE
NWNCPExtensionRequest(
NWCONN_HANDLE conn,
nuint32 NCPExtensionID,
const void* requestData,
size_t requestDataLen,
void* replyData,
size_t* replyDataLen)
{
NW_FRAGMENT rq;
NW_FRAGMENT rp;
NWCCODE err;
rq.fragAddr.ro = requestData;
rq.fragSize = requestDataLen;
rp.fragAddr.rw = replyData;
rp.fragSize = *replyDataLen;
err = NWFragNCPExtensionRequest(conn, NCPExtensionID, 1, &rq, 1, &rp);
if (!err) {
*replyDataLen = rp.fragSize;
}
return err;
}
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