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