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309ae4659e
mars-nwe/nwfile.c
Mario Fetka 309ae4659e mars_nwe-0.98.pl07
2011-11-13 00:38:58 +01:00

733 lines
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/* nwfile.c 31-Dec-96 */
/* (C)opyright (C) 1993,1996 Martin Stover, Marburg, Germany
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "net.h"
#include <dirent.h>
#include <utime.h>
#include <sys/errno.h>
#include "nwvolume.h"
#include "nwfile.h"
#include "connect.h"
#include "nwconn.h"
#if USE_MMAP
# include <sys/mman.h>
static got_sig_bus=0;
void sig_bus_mmap(int rsig)
{
got_sig_bus++;
XDPRINTF((2,0, "Got sig_bus"));
signal(SIGBUS, sig_bus_mmap);
}
#endif
static FILE_HANDLE file_handles[MAX_FILE_HANDLES_CONN];
#define HOFFS 0
static int anz_fhandles=0;
static int new_file_handle(uint8 *unixname, int task)
{
int rethandle = HOFFS -1;
FILE_HANDLE *fh=NULL;
while (++rethandle < anz_fhandles) {
fh=&(file_handles[rethandle]);
if (fh->fd == -1 && !(fh->fh_flags & FH_DO_NOT_REUSE)) { /* empty slot */
rethandle++;
break;
} else fh=NULL;
}
if (fh == NULL) {
if (anz_fhandles < MAX_FILE_HANDLES_CONN) {
fh=&(file_handles[anz_fhandles]);
rethandle = ++anz_fhandles;
} else {
XDPRINTF((1, 0, "No more free file handles"));
return(0); /* no free handle anymore */
}
}
/* init handle */
fh->task = task;
fh->fd = -2;
fh->offd = 0L;
fh->tmodi = 0L;
strcpy((char*)fh->fname, (char*)unixname);
fh->fh_flags = 0;
fh->f = NULL;
XDPRINTF((5, 0, "new_file_handle=%d, anz_fhandles=%d, fn=%s",
rethandle, anz_fhandles, unixname));
return(rethandle);
}
static int free_file_handle(int fhandle)
{
int result=-0x88;
if (fhandle > HOFFS && (fhandle <= anz_fhandles)) {
FILE_HANDLE *fh=&(file_handles[fhandle-1]);
if (fh->fd > -1) {
if (fh->fh_flags & FH_IS_PIPE_COMMAND) {
if (fh->f) ext_pclose(fh->f);
fh->f = NULL;
} else {
#if USE_MMAP
if (fh->p_mmap) {
munmap(fh->p_mmap, fh->size_mmap);
fh->p_mmap = NULL;
fh->size_mmap = 0;
}
#endif
close(fh->fd);
}
if (fh->tmodi > 0L && !(FH_IS_PIPE_COMMAND & fh->fh_flags)
&& !(FH_IS_READONLY & fh->fh_flags) ) {
/* now set date and time */
struct utimbuf ut;
ut.actime = ut.modtime = fh->tmodi;
utime(fh->fname, &ut);
fh->tmodi = 0L;
}
}
fh->fd = -1;
if (fhandle == anz_fhandles && !(fh->fh_flags & FH_DO_NOT_REUSE)) {
/* was last */
anz_fhandles--;
while (anz_fhandles > HOFFS && file_handles[anz_fhandles-1].fd == -1
&& !(file_handles[anz_fhandles-1].fh_flags & FH_DO_NOT_REUSE) )
anz_fhandles--;
}
result=0;
}
XDPRINTF((5, 0, "free_file_handle=%d, anz_fhandles=%d, result=%d",
fhandle, anz_fhandles, result));
return(result); /* wrong filehandle */
}
void init_file_module(int task)
/*
* if task == -1 all handles will be free'd
* else only handles of the task will be free'd
*/
{
int k = HOFFS;
if (task < 0) {
while (k++ < anz_fhandles)
free_file_handle(k);
anz_fhandles = HOFFS;
} else {
/* I hope next is ok, added 20-Oct-96 ( 0.98.pl5 ) */
while (k++ < anz_fhandles) {
FILE_HANDLE *fh=&(file_handles[k-1]);
if (fh->task == task) {
free_file_handle(k);
}
}
}
}
static int xsetegid(gid_t gid)
{
int result = -1;
if (!seteuid(0)) {
if (setegid(gid)) {
XDPRINTF((2, 0, "Cannot change eff Group ID to %d", gid));
} else
result=0;
if (seteuid(act_uid)) {
reset_guid();
result = -1;
}
}
return(result);
}
int file_creat_open(int volume, uint8 *unixname, struct stat *stbuff,
int attrib, int access, int creatmode, int task)
/*
* creatmode: 0 = open
* | 1 = creat (ever)
* | 2 = creatnew ( creat if not exist )
* & 4 == save handle (creat)
* & 8 == ignore rights (create ever)
* attrib ??
*
* access: 0x1=read,
* 0x2=write,
* 0x4=deny read, -> F_WRLCK, no other process can make
* a read or write lock
* can only be used if file is open for writing
* 0x8=deny write -> F_RDLCK, no other process can make a writelock
* can only be used if file is open for reading
* 0x10=SH_COMPAT
*
* 0x09 (O_RDONLY | O_DENYWRITE);
* 0x05 (O_RDONLY | O_DENYREAD);
*
* 0x0b (O_RDWR | O_DENYWRITE);
* 0x07 (O_RDWR | O_DENYREAD);
*
* 0x05 (O_RDONLY | O_DENYREAD | O_DENYWRITE);
* 0x07 (O_RDWR | O_DENYREAD | O_DENYWRITE);
*
*/
{
int fhandle = new_file_handle(unixname, task);
int dowrite = ((access & 2) || creatmode) ? 1 : 0;
if (fhandle > HOFFS){
FILE_HANDLE *fh=&(file_handles[fhandle-1]);
int completition = 0; /* first ok */
int voloptions = get_volume_options(volume, 1);
int acc = (!stat(fh->fname, stbuff))
? get_real_access(stbuff) : -1;
int did_grpchange = 0;
if (dowrite && (voloptions & VOL_OPTION_READONLY)) {
completition = (creatmode) ? -0x84 : -0x94;
} else if (acc > -1) {
/* do exist */
if (!S_ISDIR(stbuff->st_mode)) {
if (!(voloptions & VOL_OPTION_IS_PIPE)
|| S_ISFIFO(stbuff->st_mode) ) {
/* We look for normal file accesses */
if (creatmode & 2) {
XDPRINTF((5,0,"CREAT File exist!! :%s:", fh->fname));
completition = -0x85; /* No Priv */
} else if (dowrite && !(acc & W_OK) && !(creatmode & 0x8) ) {
if (!S_ISFIFO(stbuff->st_mode)) {
if (entry8_flags&2 && (acc & R_OK)) {
/* we use strange compatibility modus */
dowrite=0;
XDPRINTF((1, 0, "Uses strange open comp. mode for file `%s`",
fh->fname));
} else
completition = (creatmode) ? -0x84 : -0x94;
} else
completition = (creatmode) ? -0x84 : -0x94;
} else if (!(acc & R_OK) && !(creatmode & 0x8) )
completition = -0x93;
} else if (acc & X_OK) {
/* special Handling for PIPE commands */
if (!(acc & W_OK)) {
if (acc & 0x10) /* access owner */
stbuff->st_mode |= S_IWUSR;
else if (acc & 0x20) /* access group */
stbuff->st_mode |= S_IWGRP;
else
stbuff->st_mode |= S_IWOTH;
}
} else {
XDPRINTF((4, 0, "No PIPE command rights st_mode=0x%x uid=%d, gid=%d",
stbuff->st_uid, stbuff->st_gid));
completition = -0xff;
}
} else
completition= -0xff;
} else if ( (voloptions & VOL_OPTION_IS_PIPE) || !creatmode) {
/* must exist, but don't */
completition=-0xff;
} else {
/* File do not exist yet, but must be created */
char *p=strrchr(unixname, '/');
/* first we say: not OK */
completition = -0xff;
if (p) {
*p='\0';
acc = (!stat(unixname, stbuff))
? get_real_access(stbuff) : -1;
if (acc > 0) {
if (acc & W_OK) /* we need write access for this directory */
completition=0;
else
completition=-0x84; /* no creat rights */
}
*p='/';
}
if (completition && (creatmode & 8)) {
acc=0;
completition=0;
}
}
if ( (!completition) && (acc & 0x20) && (stbuff->st_gid != act_gid)) {
/* here we try a change egid */
if (xsetegid(stbuff->st_gid)) {
completition = -0x85; /* no privillegs */
} else {
did_grpchange++;
}
}
if (!completition) {
if (voloptions & VOL_OPTION_IS_PIPE) {
/* <========= this is a PIPE Volume ====================> */
fh->fh_flags |= FH_IS_PIPE;
if (S_ISFIFO(stbuff->st_mode)){
fh->fd = open(fh->fname,
O_NONBLOCK | dowrite ? O_RDWR : O_RDONLY);
} else {
fh->fh_flags |= FH_IS_PIPE_COMMAND;
fh->fd=-3;
}
if (fh->fd != -1) {
if (!dowrite)
stbuff->st_size = 0x7fff0000 | (rand() & 0xffff);
(void)time(&(stbuff->st_mtime));
stbuff->st_atime = stbuff->st_mtime;
if (creatmode & 4)
fh->fh_flags |= FH_DO_NOT_REUSE;
if (did_grpchange)
xsetegid(act_gid);
goto file_creat_open_ret;
}
} else {
/* <========= this is NOT a PIPE Volume ====================> */
if (creatmode) { /* creat File */
if (creatmode & 0x2) { /* creatnew */
XDPRINTF((5,0,"CREAT FILE:%s: Handle=%d", fh->fname, fhandle));
fh->fd = creat(fh->fname, 0777);
if (fh->fd < 0)
completition = -0x84; /* no create Rights */
else
chmod(fh->fname, act_umode_file);
} else {
XDPRINTF((5,0,"CREAT FILE, ever with attrib:0x%x, access:0x%x, fh->fname:%s: handle:%d",
attrib, access, fh->fname, fhandle));
fh->fd = open(fh->fname, O_CREAT|O_TRUNC|O_RDWR, 0777);
if (fh->fd < 0) {
if (creatmode & 0x8) {
if ( (!seteuid(0)) && (-1 < (fh->fd =
open(fh->fname, O_CREAT|O_TRUNC|O_RDWR, 0777)))) {
chown(fh->fname, act_uid, act_gid);
}
did_grpchange=0;
reset_guid();
}
if (fh->fd < 0)
completition = -0x85; /* no delete /create Rights */
} else
chmod(fh->fname, act_umode_file);
}
if (fh->fd > -1) {
close(fh->fd);
fh->fd = open(fh->fname, O_RDWR);
fh->offd = 0L;
stat(fh->fname, stbuff);
}
} else {
/* ======== 'normal' open of file ================ */
int acm = (dowrite) ? (int) O_RDWR : (int)O_RDONLY;
if (S_ISFIFO(stbuff->st_mode)){
acm |= O_NONBLOCK;
fh->fh_flags |= FH_IS_PIPE;
if (!dowrite) stbuff->st_size = 0x7fffffff;
(void)time(&(stbuff->st_mtime));
stbuff->st_atime = stbuff->st_mtime;
}
fh->fd = open(fh->fname, acm);
XDPRINTF((5,0, "OPEN FILE:fd=%d, attrib:0x%x, access:0x%x, fh->fname:%s:fhandle=%d",
fh->fd, attrib, access, fh->fname, fhandle));
if (fh->fd < 0)
completition = dowrite ? -0x94 : -0x93;
}
if (fh->fd > -1) {
if (!(fh->fh_flags & FH_IS_PIPE)) {
/* Not a PIPE */
if ((access & 0x4) || (access & 0x8)) {
/* we use file sharing */
struct flock flockd;
int result = (access & 0x4) ? 1 : 0; /* here for writelock */
#if 0
if (result != dowrite) {
XDPRINTF((1,0, "OpenFile:Share(access)=0x%x clashes openmode=%s, file=%s",
access, (dowrite) ? "W" : "R", fh->fname));
result = dowrite;
}
#else
if ((!dowrite) && result) {
XDPRINTF((1,0, "OpenFile:Share(access)=0x%x clashes R-open file=%s",
access, fh->fname));
result = dowrite;
}
#endif
flockd.l_type = (result) ? F_WRLCK : F_RDLCK;
flockd.l_whence = SEEK_SET;
flockd.l_start = 0;
flockd.l_len = 0;
result = fcntl(fh->fd, F_SETLK, &flockd);
XDPRINTF(((result==-1)?2:5, 0, "open shared lock:result=%d,fn='%s'",
result, fh->fname));
if (result == -1) {
close(fh->fd);
fh->fd = -1;
completition=-0xfe;
}
}
#if USE_MMAP
if (fh->fd > -1 && !dowrite) {
fh->size_mmap = fh->offd=lseek(fh->fd, 0L, SEEK_END);
if (fh->size_mmap > 0) {
fh->p_mmap = mmap(NULL,
fh->size_mmap,
PROT_READ,
MAP_SHARED,
fh->fd, 0);
if (fh->p_mmap == (uint8*) -1) {
fh->p_mmap = NULL;
fh->size_mmap=0;
}
}
}
#endif
}
}
if (fh->fd > -1) {
if (!dowrite)
fh->fh_flags |= FH_OPENED_RO;
if (voloptions & VOL_OPTION_READONLY)
fh->fh_flags |= FH_IS_READONLY;
if (creatmode & 4)
fh->fh_flags |= FH_DO_NOT_REUSE;
if (did_grpchange)
xsetegid(act_gid);
goto file_creat_open_ret;
}
} /* else (note pipecommand) */
} /* if !completition */
if (did_grpchange)
xsetegid(act_gid);
XDPRINTF((5,0,"OPEN FILE not OK (-0x%x), fh->name:%s: fhandle=%d",
-completition, fh->fname, fhandle));
free_file_handle(fhandle);
fhandle=completition;
} else fhandle=-0x81; /* no more File Handles */
file_creat_open_ret:
MDEBUG(D_FH_OPEN, {
char fname[200];
if (!fd_2_fname(fhandle, fname, sizeof(fname))){
dprintf("Open/creat fd=%d, fn=`%s`", fhandle, fname);
}
})
return(fhandle);
}
int nw_set_fdate_time(uint32 fhandle, uint8 *datum, uint8 *zeit)
{
if (fhandle > HOFFS && (--fhandle < anz_fhandles) ) {
FILE_HANDLE *fh=&(file_handles[fhandle]);
if (fh->fd > -1) {
if (!(fh->fh_flags & FH_IS_READONLY)) {
fh->tmodi = nw_2_un_time(datum, zeit);
return(0);
} else return(-0x8c);
} else if (fh->fd == -3) return(0);
}
return(-0x88); /* wrong filehandle */
}
int nw_close_datei(int fhandle, int reset_reuse)
{
XDPRINTF((5, 0, "nw_close_datei handle=%d, anz_fhandles",
fhandle, anz_fhandles));
MDEBUG(D_FH_OPEN, {
char fname[200];
int r=fd_2_fname(fhandle, fname, sizeof(fname));
dprintf("nw_close_datei: fd=%d, fn=`%s`,r=%d", fhandle, fname, r);
})
if (fhandle > HOFFS && (fhandle <= anz_fhandles)) {
FILE_HANDLE *fh=&(file_handles[fhandle-1]);
if (reset_reuse) fh->fh_flags &= (~FH_DO_NOT_REUSE);
if (fh->fd > -1 || (fh->fd == -3 && fh->fh_flags & FH_IS_PIPE_COMMAND)) {
int result = 0;
int result2;
if (fh->fh_flags & FH_IS_PIPE_COMMAND) {
if (fh->f) {
result=ext_pclose(fh->f);
if (result > 0) result = 0;
}
fh->f = NULL;
} else {
#if USE_MMAP
if (fh->p_mmap) {
munmap(fh->p_mmap, fh->size_mmap);
fh->p_mmap = NULL;
fh->size_mmap = 0;
}
#endif
result=close(fh->fd);
}
fh->fd = -1;
if (fh->tmodi > 0L && !(fh->fh_flags & FH_IS_PIPE)
&& !(fh->fh_flags & FH_IS_READONLY)) {
struct utimbuf ut;
ut.actime = ut.modtime = fh->tmodi;
utime(fh->fname, &ut);
fh->tmodi = 0L;
}
#ifdef TEST_FNAME
if (fhandle == test_handle) {
test_handle = -1;
nw_debug = -99;
}
#endif
result2=free_file_handle(fhandle);
return((result == -1) ? -0xff : result2);
} else return(free_file_handle(fhandle));
}
return(-0x88); /* wrong filehandle */
}
uint8 *file_get_unix_name(int fhandle)
{
if (fhandle > HOFFS && (--fhandle < anz_fhandles)) {
return((uint8*)file_handles[fhandle].fname);
}
return(NULL);
}
static void open_pipe_command(FILE_HANDLE *fh, int dowrite)
{
if (NULL == fh->f) {
char pipecommand[512];
sprintf(pipecommand, "%s %s %d %d",
fh->fname,
dowrite ? "WRITE" : "READ",
act_connection, act_pid);
fh->f = ext_popen(pipecommand, geteuid(), getegid());
}
fh->fd = (fh->f) ? fileno(fh->f->fildes[dowrite ? 0 : 1]) : -3;
}
int nw_read_datei(int fhandle, uint8 *data, int size, uint32 offset)
{
if (fhandle > HOFFS && (--fhandle < anz_fhandles)) {
FILE_HANDLE *fh=&(file_handles[fhandle]);
if (fh->fh_flags & FH_IS_PIPE_COMMAND)
open_pipe_command(fh, 0);
if (fh->fd > -1) {
if (fh->fh_flags & FH_IS_PIPE) { /* PIPE */
int readsize=size;
if (-1 == (size = read(fh->fd, data, readsize)) ) {
int k=2;
do {
sleep(1);
} while(k-- && -1 == (size = read(fh->fd, data, readsize)));
if (size == -1) size=0;
}
if (!size) {
if (fh->f->flags & 1) return(-0x57);
fh->f->flags |= 1;
}
} else {
#if USE_MMAP
if (fh->p_mmap) {
while (1) {
if (offset < fh->size_mmap) {
if (size + offset > fh->size_mmap)
size = fh->size_mmap - offset;
memcpy(data, fh->p_mmap+offset, size);
if (got_sig_bus) {
fh->size_mmap = lseek(fh->fd, 0L, SEEK_END);
got_sig_bus = 0;
} else
break;
} else {
size=-1;
break;
}
} /* while */
} else {
#endif
if (fh->offd != (long)offset) {
fh->offd=lseek(fh->fd, offset, SEEK_SET);
if (fh->offd < 0) {
XDPRINTF((5,0,"read-file failed in lseek"));
}
}
if (fh->offd > -1L) {
if ((size = read(fh->fd, data, size)) > -1)
fh->offd+=(long)size;
else {
XDPRINTF((5,0,"read-file failed in read"));
}
} else size = -1;
#if USE_MMAP
}
#endif
}
if (size == -1) size=0;
return(size);
} else if (fh->fd == -3) return(0);
}
return(-0x88); /* wrong filehandle */
}
int nw_seek_datei(int fhandle, int modus)
{
if (fhandle > HOFFS && (--fhandle < anz_fhandles)) {
FILE_HANDLE *fh=&(file_handles[fhandle]);
if (fh->fd > -1) {
if (fh->fh_flags & FH_IS_PIPE) { /* PIPE */
return(0x7fff0000 | (rand() & 0xffff) );
} else {
int size=-0xfb;
if (!modus) {
if ( (size=fh->offd=lseek(fh->fd, 0L, SEEK_END)) < 0L)
size = -1;
}
return(size);
}
} else if (fh->fd == -3) return(0x7fff0000 | (rand() & 0xffff) );
/* PIPE COMMAND */
}
return(-0x88); /* wrong filehandle */
}
int nw_write_datei(int fhandle, uint8 *data, int size, uint32 offset)
{
if (fhandle > HOFFS && (--fhandle < anz_fhandles)) {
FILE_HANDLE *fh=&(file_handles[fhandle]);
if (fh->fh_flags & FH_IS_PIPE_COMMAND)
open_pipe_command(fh, 1);
if (fh->fd > -1) {
if (fh->fh_flags & FH_OPENED_RO) return(-0x94);
if (fh->fh_flags & FH_IS_PIPE) { /* PIPE */
return(size ? write(fh->fd, data, size) : 0);
} else {
if (fh->offd != (long)offset)
fh->offd = lseek(fh->fd, offset, SEEK_SET);
if (size) {
if (fh->offd > -1L) {
size = write(fh->fd, data, size);
fh->offd+=(long)size;
} else size = -1;
return(size);
} else { /* truncate FILE */
int result;
#ifdef LINUX
result = ftruncate(fh->fd, offset);
#else
struct flock flockd;
flockd.l_type = 0;
flockd.l_whence = SEEK_SET;
flockd.l_start = offset;
flockd.l_len = 0;
result = fcntl(fh->fd, F_FREESP, &flockd);
#endif
XDPRINTF((5,0,"File %s is truncated, result=%d", fh->fname, result));
fh->offd = -1L;
return(result);
}
}
} else if (fh->fd == -3) return(0);
}
return(- 0x88); /* wrong filehandle */
}
int nw_server_copy(int qfhandle, uint32 qoffset,
int zfhandle, uint32 zoffset,
uint32 size)
{
if (qfhandle > HOFFS && (--qfhandle < anz_fhandles)
&& zfhandle > HOFFS && (--zfhandle < anz_fhandles) ) {
FILE_HANDLE *fhq=&(file_handles[qfhandle]);
FILE_HANDLE *fhz=&(file_handles[zfhandle]);
int retsize = -1;
if (fhq->fd > -1 && fhz->fd > -1) {
char buff[4096];
int wsize;
if (fhz->fh_flags & FH_OPENED_RO) return(-0x94);
if (lseek(fhq->fd, qoffset, SEEK_SET) > -1L &&
lseek(fhz->fd, zoffset, SEEK_SET) > -1L) {
retsize = 0;
while (size) {
int xsize = read(fhq->fd, buff, min(size, (uint32)sizeof(buff)));
if (xsize > 0){
if ((wsize =write(fhz->fd, buff, xsize)) != xsize) {
retsize = -0x1; /* out of Disk Space */
break;
} else {
size -= (uint32)xsize;
retsize += wsize;
}
} else {
if (xsize < 0) retsize=-0x93; /* no read privilegs */
break;
}
}
}
fhq->offd = -1L;
fhz->offd = -1L;
return(retsize);
}
}
return(-0x88); /* wrong filehandle */
}
int nw_lock_datei(int fhandle, int offset, int size, int do_lock)
{
if (fhandle > HOFFS && (--fhandle < anz_fhandles)) {
FILE_HANDLE *fh=&(file_handles[fhandle]);
if (fh->fd > -1) {
struct flock flockd;
int result;
if (fh->fh_flags & FH_IS_PIPE) return(0);
flockd.l_type = (do_lock)
? ((fh->fh_flags & FH_OPENED_RO) ? F_RDLCK
: F_WRLCK)
: F_UNLCK;
flockd.l_whence = SEEK_SET;
#if 0
flockd.l_start = offset;
#else
/* Hint from:Morio Taneda <morio@sozio.geist-soz.uni-karlsruhe.de>
* dBase needs it
* 03-Dec-96
*/
flockd.l_start = (offset & 0x7fffffff);
#endif
flockd.l_len = size;
result = fcntl(fh->fd, F_SETLK, &flockd);
XDPRINTF((2, 0, "nw_%s_datei result=%d, fh=%d, offset=%d, size=%d",
(do_lock) ? "lock" : "unlock", result, fhandle, offset, size));
if (!result) return(0);
else return(-0x21); /* LOCK Violation */
} else if (fh->fd == -3) return(0);
}
return(-0x88); /* wrong filehandle */
}
int fd_2_fname(int fhandle, char *buf, int bufsize)
{
if (fhandle > HOFFS && (--fhandle < anz_fhandles)) {
FILE_HANDLE *fh=&(file_handles[fhandle]);
strmaxcpy(buf, fh->fname, bufsize-1);
return(0);
}
if (bufsize)
*buf='\0';
return(-0x88);
}
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