rpcbind can save state in a file to allow restart without forgetting
about running services.
The default location is currently "/tmp" which is
not ideal for system files. It is particularly unpleasant
to put simple files there rather than creating a directory
to contain them.
On a modern Linux system it is preferable to use /run, and there it is
even more consistent with practice to use a subdirectory.
This directory needs to be create one each boot, and while there are
tools (e.g. systemd-tmpfiles) which can do that it is cleaner to keep
rpcbind self-contained and have it create the directory.
So change the default location to /tmp/rpcbind, and create that
directory. If a different user-id is used, we need to create
and chown the directory before dropping privileges. We do this
with care so avoid chowning the wrong thing by mistake.
Signed-off-by: NeilBrown <neilb@xxxxxxxx>
---
hi,
I realized that I hadn't allowed for the fact that rpcbind changes
it's uid, and we need to mkdir and chown before that.
I've also reverted the move to /run, but moved to /tmp/rpcbind
instead. A subdirectory is a good idea, even in /tmp.
NeilBrown
configure.ac | 4 ++--
src/rpcbind.c | 5 +++++
src/rpcbind.h | 1 +
src/warmstart.c | 25 +++++++++++++++++++++----
4 files changed, 29 insertions(+), 6 deletions(-)
diff --git a/configure.ac b/configure.ac
index f84921eb27fb..df931c720f93 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,8 +22,8 @@ AC_ARG_ENABLE([warmstarts],
AM_CONDITIONAL(WARMSTART, test x$enable_warmstarts = xyes)
AC_ARG_WITH([statedir],
- AS_HELP_STRING([--with-statedir=ARG], [use ARG as state dir @<:@default=/tmp@:>@])
- ,, [with_statedir=/tmp])
+ AS_HELP_STRING([--with-statedir=ARG], [use ARG as state dir @<:@default=/tmp/rpcbind@:>@])
+ ,, [with_statedir=/tmp/rpcbind])
AC_SUBST([statedir], [$with_statedir])
AC_ARG_WITH([rpcuser],
diff --git a/src/rpcbind.c b/src/rpcbind.c
index 87ccdc27e4c9..8db8dfc17c27 100644
--- a/src/rpcbind.c
+++ b/src/rpcbind.c
@@ -263,6 +263,11 @@ main(int argc, char *argv[])
syslog(LOG_ERR, "cannot get uid of '%s': %m", id);
exit(1);
}
+#ifdef WARMSTART
+ if (warmstart) {
+ mkdir_warmstart(p->pw_uid);
+ }
+#endif
if (setgid(p->pw_gid) == -1) {
syslog(LOG_ERR, "setgid to '%s' (%d) failed: %m", id, p->pw_gid);
exit(1);
diff --git a/src/rpcbind.h b/src/rpcbind.h
index 74f9591ae720..5b1a9bb8651a 100644
--- a/src/rpcbind.h
+++ b/src/rpcbind.h
@@ -129,6 +129,7 @@ int is_localroot(struct netbuf *);
extern void pmap_service(struct svc_req *, SVCXPRT *);
#endif
+void mkdir_warmstart(int uid);
void write_warmstart(void);
void read_warmstart(void);
diff --git a/src/warmstart.c b/src/warmstart.c
index 122a058b7954..3a6bcb5e34e1 100644
--- a/src/warmstart.c
+++ b/src/warmstart.c
@@ -45,19 +45,23 @@
#include <syslog.h>
#include <unistd.h>
#include <errno.h>
+#include <fcntl.h>
#include "rpcbind.h"
-#ifndef RPCBIND_STATEDIR
-#define RPCBIND_STATEDIR "/tmp"
-#endif
-
/* These files keep the pmap_list and rpcb_list in XDR format */
#define RPCBFILE RPCBIND_STATEDIR "/rpcbind.xdr"
#ifdef PORTMAP
#define PMAPFILE RPCBIND_STATEDIR "/portmap.xdr"
#endif
+#ifndef O_DIRECTORY
+#define O_DIRECTORY 0
+#endif
+#ifndef O_NOFOLLOW
+#define O_NOFOLLOW 0
+#endif
+
static bool_t write_struct(char *, xdrproc_t, void *);
static bool_t read_struct(char *, xdrproc_t, void *);
@@ -139,8 +143,21 @@ error:
}
void
+mkdir_warmstart(int uid)
+{
+ if (mkdir(RPCBIND_STATEDIR, 0770) == 0) {
+ int fd = open(RPCBIND_STATEDIR, O_RDONLY | O_DIRECTORY | O_NOFOLLOW);
+ if (fd >= 0) {
+ fchown(fd, uid, -1);
+ close(fd);
+ }
+ }
+}
+
+void
write_warmstart()
{
+ (void) mkdir(RPCBIND_STATEDIR, 0770);
(void) write_struct(RPCBFILE, (xdrproc_t)xdr_rpcblist_ptr, &list_rbl);
#ifdef PORTMAP
(void) write_struct(PMAPFILE, (xdrproc_t)xdr_pmaplist_ptr, &list_pml);
--
2.10.2
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