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#include "headers.h"
#define INMEMORYTRUNCTHRESH (256 * 1024)
static int
dirfwstatlength(int fd, vlong offset)
{
Dir d;
memset(&d, 0xff, sizeof(d));
d.name = d.uid = d.gid = d.muid = nil;
d.length = offset;
return dirfwstat(fd, &d);
}
SmbProcessResult
smbtruncatefile(SmbSession *s, SmbFile *f, vlong offset)
{
Dir *d;
ulong o;
uchar *db = nil;
vlong length;
int rv;
SmbProcessResult pr;
d = dirfstat(f->fd);
assert(d);
length = d->length;
free(d);
if (length == offset)
return SmbProcessResultReply;
rv = dirfwstatlength(f->fd, offset);
if (rv == 0) {
pr = SmbProcessResultReply;
goto done;
}
//smblogprint(-1, "dirfwstatlength failed: %r\n");
if (length > offset) {
int nfd;
char *fullpath;
if (offset > INMEMORYTRUNCTHRESH) {
smblogprint(-1, "smbcomwrite: truncation beyond %lud not supported\n", offset);
pr = SmbProcessResultUnimp;
goto done;
}
db = smbemalloc(offset);
if (pread(f->fd, db, offset, 0) != offset) {
pr = SmbProcessResultMisc;
goto done;
}
fullpath = nil;
smbstringprint(&fullpath, "%s%s", f->t->serv->path, f->name);
nfd = open(fullpath, f->p9mode | OTRUNC);
free(fullpath);
if (nfd < 0) {
smbseterror(s, ERRDOS, ERRnoaccess);
pr = SmbProcessResultError;
goto done;
}
close(nfd);
if (pwrite(f->fd, db, offset, 0) != offset) {
pr = SmbProcessResultMisc;
goto done;
}
pr = SmbProcessResultReply;
}
else {
db = smbemalloc(16384);
memset(db, 0, 16384);
o = length;
while (o < offset) {
long tt = 16384;
if (tt > offset - o)
tt = offset - o;
if (pwrite(f->fd, db, tt, o) != tt) {
smbseterror(s, ERRDOS, ERRnoaccess);
pr = SmbProcessResultError;
goto done;
}
o += tt;
}
pr = SmbProcessResultReply;
}
done:
free(db);
return pr;
}
SmbProcessResult
smbcomwrite(SmbSession *s, SmbHeader *h, uchar *pdata, SmbBuffer *b)
{
SmbTree *t;
SmbFile *f;
ushort fid;
ushort count;
ulong offset;
long nb;
ushort yacount;
uchar fmt;
if (h->wordcount != 5)
return SmbProcessResultFormat;
fid = smbnhgets(pdata); pdata += 2;
count = smbnhgets(pdata); pdata += 2;
offset = smbnhgetl(pdata);
smblogprint(SMB_COM_WRITE, "smbcomwrite: fid 0x%.4ux count 0x%.4ux offset 0x%.8lux\n",
fid, count, offset);
if (!smbbuffergetb(b, &fmt)
|| fmt != 1
|| !smbbuffergets(b, &yacount)
|| yacount != count
|| smbbufferreadspace(b) < count)
return SmbProcessResultFormat;
t = smbidmapfind(s->tidmap, h->tid);
if (t == nil) {
smbseterror(s, ERRSRV, ERRinvtid);
return SmbProcessResultError;
}
f = smbidmapfind(s->fidmap, fid);
if (f == nil) {
smbseterror(s, ERRDOS, ERRbadfid);
return SmbProcessResultError;
}
if (!f->ioallowed) {
smbseterror(s, ERRDOS, ERRbadaccess);
return SmbProcessResultError;
}
if (count == 0) {
SmbProcessResult pr = smbtruncatefile(s, f, offset);
if (pr != SmbProcessResultReply)
return pr;
nb = 0;
}
else {
seek(f->fd, offset, 0);
nb = write(f->fd, smbbufferreadpointer(b), count);
if (nb < 0) {
smbseterror(s, ERRDOS, ERRnoaccess);
return SmbProcessResultError;
}
}
h->wordcount = 1;
if (!smbbufferputheader(s->response, h, &s->peerinfo)
|| !smbbufferputs(s->response, nb)
|| !smbbufferputs(s->response, 0))
return SmbProcessResultMisc;
return SmbProcessResultReply;
}
SmbProcessResult
smbcomwriteandx(SmbSession *s, SmbHeader *h, uchar *pdata, SmbBuffer *b)
{
uchar andxcommand;
ushort andxoffset;
ulong andxoffsetfixup;
SmbTree *t;
SmbFile *f;
ushort dataoff, fid, count;
vlong offset;
long nb;
if (h->wordcount != 12 && h->wordcount != 14)
return SmbProcessResultFormat;
andxcommand = *pdata++; // andx command
pdata++; // reserved
andxoffset = smbnhgets(pdata); pdata += 2; // andx offset
fid = smbnhgets(pdata); pdata += 2; // fid
offset = smbnhgetl(pdata); pdata += 4; // offset in file
pdata += 4; // timeout
pdata += 2; // write mode
pdata += 2; // (Remaining) bytes waiting to be written
pdata += 2; // Reserved
count = smbnhgets(pdata); pdata += 2; // LSBs of length
dataoff = smbnhgets(pdata); pdata += 2; // offset to data in packet
if (dataoff + count > smbbufferwriteoffset(b))
return SmbProcessResultFormat;
if(h->wordcount == 14)
offset |= (vlong)smbnhgetl(pdata)<<32;
smblogprint(SMB_COM_WRITE_ANDX, "smbcomwriteandx: fid 0x%.4ux count 0x%.4ux offset 0x%.llux\n",
fid, count, offset);
t = smbidmapfind(s->tidmap, h->tid);
if (t == nil) {
smbseterror(s, ERRSRV, ERRinvtid);
return SmbProcessResultError;
}
f = smbidmapfind(s->fidmap, fid);
if (f == nil) {
smbseterror(s, ERRDOS, ERRbadfid);
return SmbProcessResultError;
}
if (!f->ioallowed) {
smbseterror(s, ERRDOS, ERRbadaccess);
return SmbProcessResultError;
}
seek(f->fd, offset, 0);
nb = write(f->fd, smbbufferpointer(b, dataoff), count);
if (nb < 0) {
smbseterror(s, ERRDOS, ERRnoaccess);
return SmbProcessResultError;
}
h->wordcount = 6;
if (!smbbufferputandxheader(s->response, h, &s->peerinfo, andxcommand, &andxoffsetfixup))
return SmbProcessResultMisc;
if (!smbbufferputs(s->response, nb) // Count
|| !smbbufferputs(s->response, 0) // Available
|| !smbbufferputl(s->response, 0) // Reserved
|| !smbbufferputs(s->response, 0)) // byte count in reply
return SmbProcessResultMisc;
if (andxcommand != SMB_COM_NO_ANDX_COMMAND)
return smbchaincommand(s, h, andxoffsetfixup, andxcommand, andxoffset, b);
return SmbProcessResultReply;
}
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