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Update.
* nis/nss_nis/nis-netgrp.c: Remove locking by using data in struct __netgrent object passed in instead of global variables. Optimize. * nis/nss_nisplus/nisplus-netgrp.c: Remove locking by using data in struct __netgrent object passed in instead of global variables. * inet/netgroup.h (struct __netgrent): Add service_user field. Move cursor in anonymous union, add new field location to that union. * inet/getnetgrent_r.c: Extensive rewrite to really enable concurrent uset of set/get/endnetgrent and innetgr.
This commit is contained in:
Ulrich Drepper
parent
a575320641
commit
8500b0caba
13
ChangeLog
13
ChangeLog
@ -1,8 +1,15 @@
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2004-08-13 Ulrich Drepper <drepper@redhat.com>
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* inet/getnetgrent_r.c (innetgr): We must get the lock used for
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the set/get/end interfaces since we call all these functions in
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succession and must not be interrupted doing this.
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* nis/nss_nis/nis-netgrp.c: Remove locking by using data in struct
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__netgrent object passed in instead of global variables.
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Optimize.
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* nis/nss_nisplus/nisplus-netgrp.c: Remove locking by using data
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in struct __netgrent object passed in instead of global variables.
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* inet/netgroup.h (struct __netgrent): Add service_user field.
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Move cursor in anonymous union, add new field location to that
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union.
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* inet/getnetgrent_r.c: Extensive rewrite to really enable
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concurrent uset of set/get/endnetgrent and innetgr.
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Reported by Chuck Simmons.
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* inet/netgroup.h (struct name_list): Replace name pointer with
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@ -28,10 +28,6 @@
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/* Protect above variable against multiple uses at the same time. */
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__libc_lock_define_initialized (static, lock)
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/* This handle for the NSS data base is shared between all
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set/get/endXXXent functions. */
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static service_user *nip;
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/* The whole information for the set/get/endnetgrent functions are
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kept in this structure. */
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static struct __netgrent dataset;
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@ -45,7 +41,7 @@ extern int __nss_netgroup_lookup (service_user **nip, const char *name,
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current location if it's not nil. Return nonzero if there are no
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services (left). */
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static enum nss_status
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setup (void **fctp, const char *func_name, int all)
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setup (void **fctp, const char *func_name, int all, service_user **nipp)
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{
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/* Remember the first service_entry, it's always the same. */
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static service_user *startp;
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@ -53,19 +49,21 @@ setup (void **fctp, const char *func_name, int all)
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if (startp == NULL)
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{
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no_more = __nss_netgroup_lookup (&nip, func_name, fctp);
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startp = no_more ? (service_user *) -1 : nip;
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/* Executing this more than once at the same time must yield the
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same result every time. So we need no locking. */
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no_more = __nss_netgroup_lookup (nipp, func_name, fctp);
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startp = no_more ? (service_user *) -1 : *nipp;
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}
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else if (startp == (service_user *) -1)
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/* No services at all. */
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return 1;
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else
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{
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if (all || !nip)
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if (all || *nipp == NULL)
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/* Reset to the beginning of the service list. */
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nip = startp;
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*nipp = startp;
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/* Look up the first function. */
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no_more = __nss_lookup (&nip, func_name, fctp);
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no_more = __nss_lookup (nipp, func_name, fctp);
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}
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return no_more;
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}
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@ -101,16 +99,15 @@ __internal_setnetgrent_reuse (const char *group, struct __netgrent *datap,
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} fct;
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enum nss_status status = NSS_STATUS_UNAVAIL;
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struct name_list *new_elem;
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int no_more;
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/* Cycle through all the services and run their setnetgrent functions. */
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no_more = setup (&fct.ptr, "setnetgrent", 1);
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int no_more = setup (&fct.ptr, "setnetgrent", 1, &datap->nip);
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while (! no_more)
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{
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/* Ignore status, we force check in `__nss_next'. */
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status = (*fct.f) (group, datap);
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no_more = __nss_next (&nip, "setnetgrent", &fct.ptr, status, 0);
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no_more = __nss_next (&datap->nip, "setnetgrent", &fct.ptr, status, 0);
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}
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/* Add the current group to the list of known groups. */
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@ -173,20 +170,19 @@ internal_endnetgrent (struct __netgrent *datap)
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enum nss_status (*f) (struct __netgrent *);
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void *ptr;
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} fct;
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int no_more;
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/* Remember which was the last used service. */
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old_nip = nip;
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old_nip = datap->nip;
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/* Cycle through all the services and run their endnetgrent functions. */
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no_more = setup (&fct.ptr, "endnetgrent", 1);
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int no_more = setup (&fct.ptr, "endnetgrent", 1, &datap->nip);
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while (! no_more)
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{
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/* Ignore status, we force check in `__nss_next'. */
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(void) (*fct.f) (datap);
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no_more = (nip == old_nip
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|| __nss_next (&nip, "endnetgrent", &fct.ptr, 0, 1));
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no_more = (datap->nip == old_nip
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|| __nss_next (&datap->nip, "endnetgrent", &fct.ptr, 0, 1));
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}
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/* Now free list of all netgroup names from last run. */
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@ -222,7 +218,6 @@ internal_getnetgrent_r (char **hostp, char **userp, char **domainp,
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enum nss_status (*f) (struct __netgrent *, char *, size_t, int *);
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void *ptr;
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} fct;
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int no_more;
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/* Initialize status to return if no more functions are found. */
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enum nss_status status = NSS_STATUS_NOTFOUND;
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@ -230,7 +225,7 @@ internal_getnetgrent_r (char **hostp, char **userp, char **domainp,
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/* Run through available functions, starting with the same function last
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run. We will repeat each function as long as it succeeds, and then go
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on to the next service action. */
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no_more = setup (&fct.ptr, "getnetgrent_r", 0);
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int no_more = setup (&fct.ptr, "getnetgrent_r", 0, &datap->nip);
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while (! no_more)
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{
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status = (*fct.f) (datap, buffer, buflen, &errno);
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@ -284,7 +279,7 @@ internal_getnetgrent_r (char **hostp, char **userp, char **domainp,
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}
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}
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no_more = __nss_next (&nip, "getnetgrent_r", &fct.ptr, status, 0);
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no_more = __nss_next (&datap->nip, "getnetgrent_r", &fct.ptr, status, 0);
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}
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if (status == NSS_STATUS_SUCCESS)
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@ -337,14 +332,12 @@ innetgr (const char *netgroup, const char *host, const char *user,
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int (*f) (struct __netgrent *, char *, size_t, int *);
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void *ptr;
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} getfct;
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struct name_list *known = NULL;
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struct name_list *needed = NULL;
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struct __netgrent entry;
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int result = 0;
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int no_more;
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const char *current_group = netgroup;
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int real_entry = 0;
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__libc_lock_lock (lock);
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memset (&entry, '\0', sizeof (entry));
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/* Walk through the services until we found an answer or we shall
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not work further. We can do some optimization here. Since all
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@ -352,19 +345,14 @@ innetgr (const char *netgroup, const char *host, const char *user,
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the work during one walk through the service list. */
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while (1)
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{
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no_more = setup (&setfct.ptr, "setnetgrent", 1);
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int no_more = setup (&setfct.ptr, "setnetgrent", 1, &entry.nip);
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while (! no_more)
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{
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enum nss_status status;
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struct __netgrent entry;
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/* Clear the space for the netgroup data. */
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__bzero (&entry, sizeof (entry));
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/* Open netgroup. */
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status = (*setfct.f) (current_group, &entry);
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enum nss_status status = (*setfct.f) (current_group, &entry);
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if (status == NSS_STATUS_SUCCESS
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&& __nss_lookup (&nip, "getnetgrent_r", &getfct.ptr) == 0)
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&& __nss_lookup (&entry.nip, "getnetgrent_r", &getfct.ptr) == 0)
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{
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char buffer[1024];
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@ -376,7 +364,8 @@ innetgr (const char *netgroup, const char *host, const char *user,
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/* Make sure we haven't seen the name before. */
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struct name_list *namep;
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for (namep = known; namep != NULL; namep = namep->next)
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for (namep = entry.known_groups; namep != NULL;
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namep = namep->next)
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if (strcmp (entry.val.group, namep->name) == 0)
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break;
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if (namep == NULL
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@ -393,9 +382,9 @@ innetgr (const char *netgroup, const char *host, const char *user,
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break;
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}
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namep->next = needed;
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namep->next = entry.needed_groups;
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memcpy (namep->name, entry.val.group, group_len);
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needed = namep;
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entry.needed_groups = namep;
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}
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}
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else
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@ -425,21 +414,21 @@ innetgr (const char *netgroup, const char *host, const char *user,
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}
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/* Free all resources of the service. */
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if (__nss_lookup (&nip, "endnetgrent", &endfct.ptr) == 0)
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if (__nss_lookup (&entry.nip, "endnetgrent", &endfct.ptr) == 0)
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(*endfct.f) (&entry);
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/* Look for the next service. */
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no_more = __nss_next (&nip, "setnetgrent",
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no_more = __nss_next (&entry.nip, "setnetgrent",
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&setfct.ptr, status, 0);
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}
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if (result == 0 && needed != NULL)
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if (result == 0 && entry.needed_groups != NULL)
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{
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struct name_list *tmp = needed;
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needed = tmp->next;
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tmp->next = known;
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known = tmp;
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current_group = known->name;
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struct name_list *tmp = entry.needed_groups;
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entry.needed_groups = tmp->next;
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tmp->next = entry.known_groups;
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entry.known_groups = tmp;
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current_group = entry.known_groups->name;
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continue;
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}
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@ -447,22 +436,9 @@ innetgr (const char *netgroup, const char *host, const char *user,
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break;
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}
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__libc_lock_unlock (lock);
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/* Free the memory. */
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while (known != NULL)
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{
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struct name_list *tmp = known;
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known = known->next;
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free (tmp);
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}
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while (needed != NULL)
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{
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struct name_list *tmp = needed;
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needed = needed->next;
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free (tmp);
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}
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free_memory (&entry);
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return result == 1;
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return result;
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}
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libc_hidden_def (innetgr)
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@ -20,6 +20,8 @@
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#ifndef _NETGROUP_H
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#define _NETGROUP_H 1
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#include <nsswitch.h>
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/* A netgroup can consist of names of other netgroups. We have to
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track which netgroups were read and which still have to be read. */
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struct name_list
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@ -51,11 +53,19 @@ struct __netgrent
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functions. We must avoid global variables. */
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char *data;
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size_t data_size;
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char *cursor;
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union
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{
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char *cursor;
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unsigned long int position;
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};
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int first;
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struct name_list *known_groups;
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struct name_list *needed_groups;
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/* This handle for the NSS data base is shared between all
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set/get/endXXXent functions. */
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service_user *nip;
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};
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@ -1,4 +1,5 @@
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/* Copyright (C) 1996,1997,1999,2000,2002,2003 Free Software Foundation, Inc.
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/* Copyright (C) 1996,1997,1999,2000,2002,2003,2004
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
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@ -17,11 +18,12 @@
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <nss.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <bits/libc-lock.h>
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#include <malloc.h>
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#include <netdb.h>
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#include <nss.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -31,36 +33,28 @@
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#include "nss-nis.h"
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/* Locks the static variables in this file. */
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__libc_lock_define_initialized (static, lock)
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static char *data;
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static size_t data_size;
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static char *cursor;
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extern enum nss_status
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_nss_netgroup_parseline (char **cursor, struct __netgrent *result,
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_nss_netgroup_parseline (char **cursor, struct __netgrent *netgrp,
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char *buffer, size_t buflen, int *errnop);
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static void
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internal_nis_endnetgrent (void)
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internal_nis_endnetgrent (struct __netgrent *netgrp)
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{
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if (data != NULL)
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if (netgrp->data != NULL)
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{
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free (data);
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data = NULL;
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data_size = 0;
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cursor = NULL;
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free (netgrp->data);
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netgrp->data = NULL;
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netgrp->data_size = 0;
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netgrp->cursor = NULL;
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}
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}
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enum nss_status
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_nss_nis_setnetgrent (const char *group, struct __netgrent *dummy)
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_nss_nis_setnetgrent (const char *group, struct __netgrent *netgrp)
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{
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char *domain;
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char *result;
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int len, group_len;
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int len;
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enum nss_status status;
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status = NSS_STATUS_SUCCESS;
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@ -71,41 +65,32 @@ _nss_nis_setnetgrent (const char *group, struct __netgrent *dummy)
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if (yp_get_default_domain (&domain))
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return NSS_STATUS_UNAVAIL;
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__libc_lock_lock (lock);
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internal_nis_endnetgrent (netgrp);
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internal_nis_endnetgrent ();
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group_len = strlen (group);
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status = yperr2nss (yp_match (domain, "netgroup", group, group_len,
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&result, &len));
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status = yperr2nss (yp_match (domain, "netgroup", group, strlen (group),
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&netgrp->data, &len));
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if (status == NSS_STATUS_SUCCESS)
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{
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if (len > 0 && (data = malloc (len + 1)) != NULL)
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{
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data_size = len;
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cursor = strncpy (data, result, len + 1);
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data[len] = '\0';
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free (result);
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}
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else
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status = NSS_STATUS_NOTFOUND;
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}
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/* Our implementation of yp_match already allocates a buffer
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which is one byte larger than the value in LEN specifies
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and the last byte is filled with NUL. So we can simply
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use that buffer. */
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assert (len > 0);
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assert (malloc_usable_size (netgrp->data) >= len + 1);
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assert (netgrp->data[len] == '\0');
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__libc_lock_unlock (lock);
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netgrp->data_size = len;
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netgrp->cursor = netgrp->data;
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}
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return status;
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}
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enum nss_status
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_nss_nis_endnetgrent (struct __netgrent *dummy)
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_nss_nis_endnetgrent (struct __netgrent *netgrp)
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{
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__libc_lock_lock (lock);
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internal_nis_endnetgrent ();
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__libc_lock_unlock (lock);
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internal_nis_endnetgrent (netgrp);
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return NSS_STATUS_SUCCESS;
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}
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@ -114,16 +99,9 @@ enum nss_status
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_nss_nis_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
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int *errnop)
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{
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enum nss_status status;
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if (cursor == NULL)
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if (result->cursor == NULL)
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return NSS_STATUS_NOTFOUND;
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__libc_lock_lock (lock);
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status = _nss_netgroup_parseline (&cursor, result, buffer, buflen, errnop);
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__libc_lock_unlock (lock);
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return status;
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return _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
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errnop);
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}
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@ -1,4 +1,4 @@
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/* Copyright (C) 1997, 2003 Free Software Foundation, Inc.
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/* Copyright (C) 1997, 2003, 2004 Free Software Foundation, Inc.
|
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
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@ -23,51 +23,47 @@
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#include <netdb.h>
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#include <string.h>
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#include <netgroup.h>
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#include <bits/libc-lock.h>
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#include <rpcsvc/nis.h>
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|
||||
#include "nss-nisplus.h"
|
||||
|
||||
__libc_lock_define_initialized (static, lock)
|
||||
|
||||
static nis_result *data = NULL;
|
||||
static unsigned long data_size = 0;
|
||||
static unsigned long position = 0;
|
||||
|
||||
#define NISENTRYVAL(idx,col,res) \
|
||||
((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
|
||||
|
||||
#define NISENTRYLEN(idx,col,res) \
|
||||
((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
|
||||
|
||||
static enum nss_status
|
||||
_nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
|
||||
size_t buflen, int *errnop)
|
||||
enum nss_status
|
||||
_nss_nisplus_getnetgrent_r (struct __netgrent *result, char *buffer,
|
||||
size_t buflen, int *errnop)
|
||||
{
|
||||
enum nss_status status;
|
||||
|
||||
/* Some sanity checks. */
|
||||
if (data == NULL || data_size == 0)
|
||||
if (result->data == NULL || result->data_size == 0)
|
||||
return NSS_STATUS_NOTFOUND;
|
||||
|
||||
if (position == data_size)
|
||||
if (result->position == result->data_size)
|
||||
return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
|
||||
|
||||
if (NISENTRYLEN (position, 1, data) > 0)
|
||||
unsigned int entrylen
|
||||
= NISENTRYLEN (result->position, 1, (nis_result *) result->data);
|
||||
if (entrylen > 0)
|
||||
{
|
||||
/* We have a list of other netgroups. */
|
||||
|
||||
result->type = group_val;
|
||||
if (NISENTRYLEN (position, 1, data) >= buflen)
|
||||
if (entrylen >= buflen)
|
||||
{
|
||||
*errnop = ERANGE;
|
||||
return NSS_STATUS_TRYAGAIN;
|
||||
}
|
||||
strncpy (buffer, NISENTRYVAL (position, 1, data),
|
||||
NISENTRYLEN (position, 1, data));
|
||||
buffer[NISENTRYLEN (position, 1, data)] = '\0';
|
||||
strncpy (buffer, NISENTRYVAL (result->position, 1,
|
||||
(nis_result *) result->data),
|
||||
entrylen);
|
||||
buffer[entrylen] = '\0';
|
||||
result->val.group = buffer;
|
||||
++position;
|
||||
++result->position;
|
||||
result->first = 0;
|
||||
|
||||
return NSS_STATUS_SUCCESS;
|
||||
@ -75,8 +71,13 @@ _nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
|
||||
|
||||
/* Before we can copy the entry to the private buffer we have to make
|
||||
sure it is big enough. */
|
||||
if (NISENTRYLEN (position, 2, data) + NISENTRYLEN (position, 3, data) +
|
||||
NISENTRYLEN (position, 4, data) + 6 > buflen)
|
||||
unsigned int hostlen
|
||||
= NISENTRYLEN (result->position, 2, (nis_result *) result->data);
|
||||
unsigned int userlen
|
||||
= NISENTRYLEN (result->position, 3, (nis_result *) result->data);
|
||||
unsigned int domainlen
|
||||
= NISENTRYLEN (result->position, 4, (nis_result *) result->data);
|
||||
if (hostlen + userlen + domainlen + 6 > buflen)
|
||||
{
|
||||
*errnop = ERANGE;
|
||||
status = NSS_STATUS_TRYAGAIN;
|
||||
@ -87,40 +88,43 @@ _nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
|
||||
|
||||
result->type = triple_val;
|
||||
|
||||
if (NISENTRYLEN (position, 2, data) == 0)
|
||||
if (hostlen == 0)
|
||||
result->val.triple.host = NULL;
|
||||
else
|
||||
{
|
||||
result->val.triple.host = cp;
|
||||
cp = __stpncpy (cp, NISENTRYVAL (position, 2, data),
|
||||
NISENTRYLEN (position, 2, data));
|
||||
cp = __stpncpy (cp, NISENTRYVAL (result->position, 2,
|
||||
(nis_result *) result->data),
|
||||
hostlen);
|
||||
*cp++ = '\0';
|
||||
}
|
||||
|
||||
if (NISENTRYLEN (position, 3, data) == 0)
|
||||
if (userlen == 0)
|
||||
result->val.triple.user = NULL;
|
||||
else
|
||||
{
|
||||
result->val.triple.user = cp;
|
||||
cp = __stpncpy (cp, NISENTRYVAL (position, 3, data),
|
||||
NISENTRYLEN (position, 3, data));
|
||||
cp = __stpncpy (cp, NISENTRYVAL (result->position, 3,
|
||||
(nis_result *) result->data),
|
||||
userlen);
|
||||
*cp++ = '\0';
|
||||
}
|
||||
|
||||
if (NISENTRYLEN (position, 4, data) == 0)
|
||||
if (domainlen == 0)
|
||||
result->val.triple.domain = NULL;
|
||||
else
|
||||
{
|
||||
result->val.triple.domain = cp;
|
||||
cp = __stpncpy (cp, NISENTRYVAL (position, 4, data),
|
||||
NISENTRYLEN (position, 4, data));
|
||||
cp = __stpncpy (cp, NISENTRYVAL (result->position, 4,
|
||||
(nis_result *) result->data),
|
||||
domainlen);
|
||||
*cp = '\0';
|
||||
}
|
||||
|
||||
status = NSS_STATUS_SUCCESS;
|
||||
|
||||
/* Remember where we stopped reading. */
|
||||
++position;
|
||||
++result->position;
|
||||
|
||||
result->first = 0;
|
||||
}
|
||||
@ -128,8 +132,20 @@ _nss_nisplus_parse_netgroup (struct __netgrent *result, char *buffer,
|
||||
return status;
|
||||
}
|
||||
|
||||
static void
|
||||
internal_endnetgrent (struct __netgrent *netgrp)
|
||||
{
|
||||
if (netgrp->data != NULL)
|
||||
{
|
||||
nis_freeresult ((nis_result *) netgrp->data);
|
||||
netgrp->data = NULL;
|
||||
netgrp->data_size = 0;
|
||||
netgrp->position = 0;
|
||||
}
|
||||
}
|
||||
|
||||
enum nss_status
|
||||
_nss_nisplus_setnetgrent (const char *group, struct __netgrent *dummy)
|
||||
_nss_nisplus_setnetgrent (const char *group, struct __netgrent *netgrp)
|
||||
{
|
||||
enum nss_status status;
|
||||
char buf[strlen (group) + 30];
|
||||
@ -139,68 +155,38 @@ _nss_nisplus_setnetgrent (const char *group, struct __netgrent *dummy)
|
||||
|
||||
status = NSS_STATUS_SUCCESS;
|
||||
|
||||
__libc_lock_lock (lock);
|
||||
|
||||
if (data != NULL)
|
||||
{
|
||||
nis_freeresult (data);
|
||||
data = NULL;
|
||||
data_size = 0;
|
||||
position = 0;
|
||||
}
|
||||
internal_endnetgrent (netgrp);
|
||||
|
||||
sprintf (buf, "[name=%s],netgroup.org_dir", group);
|
||||
|
||||
data = nis_list (buf, EXPAND_NAME, NULL, NULL);
|
||||
netgrp->data = (char *) nis_list (buf, EXPAND_NAME, NULL, NULL);
|
||||
|
||||
if (data == NULL)
|
||||
if (netgrp->data == NULL)
|
||||
{
|
||||
__set_errno (ENOMEM);
|
||||
status = NSS_STATUS_TRYAGAIN;
|
||||
}
|
||||
else if (niserr2nss (data->status) != NSS_STATUS_SUCCESS)
|
||||
else if (niserr2nss (((nis_result *) netgrp->data)->status)
|
||||
!= NSS_STATUS_SUCCESS)
|
||||
{
|
||||
status = niserr2nss (data->status);
|
||||
nis_freeresult (data);
|
||||
data = NULL;
|
||||
status = niserr2nss (((nis_result *) netgrp->data)->status);
|
||||
|
||||
internal_endnetgrent (netgrp);
|
||||
}
|
||||
else
|
||||
data_size = data->objects.objects_len;
|
||||
|
||||
__libc_lock_unlock (lock);
|
||||
{
|
||||
netgrp->data_size = ((nis_result *) netgrp->data)->objects.objects_len;
|
||||
netgrp->position = 0;
|
||||
netgrp->first = 1;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
enum nss_status
|
||||
_nss_nisplus_endnetgrent (struct __netgrent *dummy)
|
||||
_nss_nisplus_endnetgrent (struct __netgrent *netgrp)
|
||||
{
|
||||
__libc_lock_lock (lock);
|
||||
|
||||
if (data != NULL)
|
||||
{
|
||||
nis_freeresult (data);
|
||||
data = NULL;
|
||||
data_size = 0;
|
||||
position = 0;
|
||||
}
|
||||
|
||||
__libc_lock_unlock (lock);
|
||||
internal_endnetgrent (netgrp);
|
||||
|
||||
return NSS_STATUS_SUCCESS;
|
||||
}
|
||||
|
||||
enum nss_status
|
||||
_nss_nisplus_getnetgrent_r (struct __netgrent *result,
|
||||
char *buffer, size_t buflen, int *errnop)
|
||||
{
|
||||
enum nss_status status;
|
||||
|
||||
__libc_lock_lock (lock);
|
||||
|
||||
status = _nss_nisplus_parse_netgroup (result, buffer, buflen, errnop);
|
||||
|
||||
__libc_lock_unlock (lock);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user