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// $Id$ --*- c -*--
// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
//
// 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; version 2 of the License.
//
// 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.
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "vserver.h"
#include "pathconfig.h"
#include "compat-c99.h"
#include "lib_internal/util.h"
#include "internal.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#ifdef VC_ENABLE_API_COMPAT
#include <fcntl.h>
static xid_t
extractLegacyXID(char const *dir, char const *basename)
{
size_t l1 = strlen(dir);
size_t l2 = strlen(basename);
char path[l1 + l2 + sizeof("/.ctx")];
char * ptr = path;
int fd;
ssize_t len;
xid_t result = VC_NOXID;
ptr = Xmemcpy(ptr, dir, l1);
*ptr++ = '/';
ptr = Xmemcpy(ptr, basename, l2);
ptr = Xmemcpy(ptr, ".ctx", 5);
fd = open(path, O_RDONLY);
if (fd==-1) return VC_NOXID;
len = lseek(fd, 0, SEEK_END);
if (len!=-1 && lseek(fd, 0, SEEK_SET)!=-1) {
char buf[len+2];
char const *pos = 0;
buf[0] = '\n';
if (read(fd, buf+1, len+1)==len) {
buf[len+1] = '\0';
pos = strstr(buf, "\nS_CONTEXT=");
}
if (pos) pos += 11;
if (*pos>='1' && *pos<='9')
result = atoi(pos);
}
close(fd);
return result;
}
#else
static xid_t
extractLegacyXID(char const UNUSED *dir, char const UNUSED *basename)
{
return VC_NOXID;
}
#endif
static xid_t
getCtxFromFile(char const *pathname)
{
int fd;
off_t len;
fd = open(pathname, O_RDONLY);
if (fd==-1) return VC_NOCTX;
if ((len=lseek(fd, 0, SEEK_END))==-1 ||
(len>50) ||
(lseek(fd, 0, SEEK_SET)==-1)) {
close(fd);
return VC_NOCTX;
}
{
char buf[len+1];
char *errptr;
xid_t res;
if (TEMP_FAILURE_RETRY(read(fd, buf, len+1))!=len) res = VC_NOCTX;
else {
buf[len] = '\0';
res = strtol(buf, &errptr, 10);
if (*errptr!='\0' && *errptr!='\n') res = VC_NOCTX;
}
close(fd);
return res;
}
}
xid_t
vc_getVserverCtx(char const *id, vcCfgStyle style, bool honor_static, bool *is_running,
vcCtxType type)
{
size_t l1 = strlen(id);
char buf[sizeof(CONFDIR "//") + l1 + sizeof("/ncontext")];
if (style==vcCFG_NONE || style==vcCFG_AUTO)
style = vc_getVserverCfgStyle(id);
if (is_running) *is_running = false;
switch (style) {
case vcCFG_NONE : return VC_NOCTX;
case vcCFG_LEGACY :
return extractLegacyXID(DEFAULT_PKGSTATEDIR, id);
case vcCFG_RECENT_SHORT :
case vcCFG_RECENT_FULL : {
size_t idx = 0;
xid_t res = 0;
if (style==vcCFG_RECENT_SHORT) {
memcpy(buf, CONFDIR "/", sizeof(CONFDIR "/")-1);
idx = sizeof(CONFDIR "/") - 1;
}
memcpy(buf+idx, id, l1); idx += l1;
memcpy(buf+idx, "/run", 5); // appends '\0' too
res = getCtxFromFile(buf);
// when context information could be read, we have to verify that
// it belongs to a running vserver and the both vservers are
// identically
if (res!=VC_NOCTX && type == vcCTX_XID) {
char *cur_name;
struct vc_vx_info info;
// determine the vserver which is associated with the xid resp. skip
// this step when the context does not exist. When checking whether
// the context exists, do not rely on the success of
// vc_get_vx_info() alone but check 'errno' for ESRCH also. Else,
// wrong results will be caused e.g. for xid 1 which will fail with
// ENOSYS.
cur_name = (vc_get_vx_info(res, &info)!=-1 || errno!=ESRCH ?
vc_getVserverByCtx_Internal(res, &style, 0, false) :
0);
buf[idx] = '\0'; // cut off the '/run' from the vserver name
res = ((cur_name!=0 &&
vc_compareVserverById(buf, vcCFG_RECENT_FULL,
cur_name, vcCFG_RECENT_FULL)==0)
? res
: VC_NOCTX); // correct the value of 'res'
free(cur_name);
if (is_running) // fill 'is_running' information...
*is_running = res!=VC_NOCTX;
}
else if (is_running)
*is_running = false;
if (res==VC_NOCTX && honor_static) {
check_static:
switch (type) {
case vcCTX_XID:
memcpy(buf+idx, "/context", 9); // appends '\0' too
break;
case vcCTX_NID:
memcpy(buf+idx, "/ncontext", 10);
break;
case vcCTX_TAG:
memcpy(buf+idx, "/tag", 5);
break;
}
res = getCtxFromFile(buf);
if (res==VC_NOCTX && type!=vcCTX_XID) {
type = vcCTX_XID;
goto check_static;
}
}
return res;
}
default : return VC_NOCTX;
}
}
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