1nfs4_uid_to_name(3)        Library Functions Manual        nfs4_uid_to_name(3)
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NAME

6       nfs4_uid_to_name, nfs4_gid_to_name, nfs4_name_to_uid, nfs4_name_to_gid,
7       nfs4_init_name_mapping, nfs4_get_default_domain, nfs4_gss_princ_to_ids:
8       idmapping for nfsv4
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SYNOPSIS

11       #include <nfs4_idmap.h>
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13       int nfs4_init_name_mapping(char *conffile);
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15       int nfs4_get_default_domain(char *server, char *domain, size_t len);
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17       int nfs4_uid_to_name(uid_t uid, char *domain, char *name, size_t len);
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19       int nfs4_gid_to_name(gid_t gid, char *domain, char *name, size_t len);
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21       int nfs4_name_to_uid(char *name, uid_t *uid);
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23       int nfs4_name_to_gid(char *name, gid_t *gid);
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25       int nfs4_gss_princ_to_ids(char *princ, uid_t *uid, gid_t *gid);
26       int nfs4_get_grouplist(const char *name, gid_t *groups, int *ngroups);
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DESCRIPTION

29       NFSv4 uses names of the form user@domain.  To write code that helps the
30       kernel map uid's (as rpc.idmapd does) or that processes NFSv4 ACLs, you
31       need to be able to convert between NFSv4 names and local uids and gids.
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33       The  nfs4_uid_to_name()  and nfs4_gid_to_name() functions, given uid or
34       gid and domain (as a null-terminated string), write  the  corresponding
35       nfsv4 name into the buffer provided in name, which must be of length at
36       least len.
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38       The nfs4_name_to_uid() and nfs4_name_to_gid() functions, given name (as
39       a  null-terminated  string), return the corresponding uid or gid in the
40       second parameter.
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42       The nfs4_init_name_mapping() function must be called before  using  any
43       of  these  functions.  It reads defaults from the configuration file at
44       the provided path, usually "etc/idmapd.conf".
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46       The domain argument to the id-to-name functions is there to  provide  a
47       hint  to  the  name  mapper  in the case where an id might be mapped to
48       names in multiple domains.  In most cases, this argument should just be
49       the  name  returned in the domain argument to nfs4_get_default_domain()
50       which should be called with server set to NULL.  The domain should be a
51       buffer  of length len.  The constant NFS4_MAX_DOMAIN_LEN may be used to
52       determine a reasonable value for that length.
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54       The function nfs4_get_grouplist(), given a  name,  fills  the  provided
55       array  groups  with up to *ngroups group IDs corresponding to which the
56       user name belongs to, setting *ngroups to the  actual  number  of  such
57       groups.   If  the  user  belongs  to more than *ngroups groups, then an
58       error is returned  and  the  actual  number  of  groups  is  stored  in
59       *ngroups.
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61       Finally,  nfs4_gss_princ_to_ids() is used to convert from a gss princi‐
62       pal name (as returned by gss_display_name()) to a uid and gid.
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RETURN VALUE

65       All functions return 0 or, in the case of error, -ERRNO.
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69                                  2004-08-05               nfs4_uid_to_name(3)
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