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commit dd3022d75e6fb8957843d6d84257a5d8457822d5
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Thu Mar 27 19:49:51 2014 +0530
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Return NULL for wildcard values in getnetgrent from nscd (BZ #16759)
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getnetgrent is supposed to return NULL for values that are wildcards
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in the (host, user, domain) triplet. This works correctly with nscd
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disabled, but with it enabled, it returns a blank ("") instead of a
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NULL. This is easily seen with the output of `getent netgroup foonet`
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for a netgroup foonet defined as follows in /etc/netgroup:
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foonet (,foo,)
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The output with nscd disabled is:
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foonet ( ,foo,)
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while with nscd enabled, it is:
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foonet (,foo,)
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The extra space with nscd disabled is due to the fact that `getent
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netgroup` adds it if the return value from getnetgrent is NULL for
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either host or user.
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diff --git glibc-2.17-c758a686/inet/getnetgrent_r.c glibc-2.17-c758a686/inet/getnetgrent_r.c
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index 62cdfda..f6d064d 100644
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--- glibc-2.17-c758a686/inet/getnetgrent_r.c
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+++ glibc-2.17-c758a686/inet/getnetgrent_r.c
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@@ -235,6 +235,14 @@ endnetgrent (void)
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__libc_lock_unlock (lock);
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}
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+static const char *
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+get_nonempty_val (const char *in)
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+{
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+ if (*in == '\0')
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+ return NULL;
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+ return in;
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+}
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+
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#ifdef USE_NSCD
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static enum nss_status
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nscd_getnetgrent (struct __netgrent *datap, char *buffer, size_t buflen,
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@@ -243,11 +251,11 @@ nscd_getnetgrent (struct __netgrent *datap, char *buffer, size_t buflen,
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return NSS_STATUS_UNAVAIL;
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datap->type = triple_val;
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- datap->val.triple.host = datap->cursor;
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+ datap->val.triple.host = get_nonempty_val (datap->cursor);
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datap->cursor = (char *) __rawmemchr (datap->cursor, '\0') + 1;
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- datap->val.triple.user = datap->cursor;
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+ datap->val.triple.user = get_nonempty_val (datap->cursor);
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datap->cursor = (char *) __rawmemchr (datap->cursor, '\0') + 1;
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- datap->val.triple.domain = datap->cursor;
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+ datap->val.triple.domain = get_nonempty_val (datap->cursor);
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datap->cursor = (char *) __rawmemchr (datap->cursor, '\0') + 1;
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return NSS_STATUS_SUCCESS;
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