diff options
Diffstat (limited to 'REORG.TODO/grp/compat-initgroups.c')
-rw-r--r-- | REORG.TODO/grp/compat-initgroups.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/REORG.TODO/grp/compat-initgroups.c b/REORG.TODO/grp/compat-initgroups.c new file mode 100644 index 0000000000..3dd50d2306 --- /dev/null +++ b/REORG.TODO/grp/compat-initgroups.c @@ -0,0 +1,116 @@ +/* Prototype for the setgrent functions we use here. */ +typedef enum nss_status (*set_function) (void); + +/* Prototype for the endgrent functions we use here. */ +typedef enum nss_status (*end_function) (void); + +/* Prototype for the setgrent functions we use here. */ +typedef enum nss_status (*get_function) (struct group *, char *, + size_t, int *); + + +static enum nss_status +compat_call (service_user *nip, const char *user, gid_t group, long int *start, + long int *size, gid_t **groupsp, long int limit, int *errnop) +{ + struct group grpbuf; + enum nss_status status; + set_function setgrent_fct; + get_function getgrent_fct; + end_function endgrent_fct; + gid_t *groups = *groupsp; + + getgrent_fct = __nss_lookup_function (nip, "getgrent_r"); + if (getgrent_fct == NULL) + return NSS_STATUS_UNAVAIL; + + setgrent_fct = __nss_lookup_function (nip, "setgrent"); + if (setgrent_fct) + { + status = DL_CALL_FCT (setgrent_fct, ()); + if (status != NSS_STATUS_SUCCESS) + return status; + } + + endgrent_fct = __nss_lookup_function (nip, "endgrent"); + + struct scratch_buffer tmpbuf; + scratch_buffer_init (&tmpbuf); + enum nss_status result = NSS_STATUS_SUCCESS; + + do + { + while ((status = DL_CALL_FCT (getgrent_fct, + (&grpbuf, tmpbuf.data, tmpbuf.length, + errnop)), + status == NSS_STATUS_TRYAGAIN) + && *errnop == ERANGE) + { + if (!scratch_buffer_grow (&tmpbuf)) + { + result = NSS_STATUS_TRYAGAIN; + goto done; + } + } + + if (status != NSS_STATUS_SUCCESS) + goto done; + + if (grpbuf.gr_gid != group) + { + char **m; + + for (m = grpbuf.gr_mem; *m != NULL; ++m) + if (strcmp (*m, user) == 0) + { + /* Check whether the group is already on the list. */ + long int cnt; + for (cnt = 0; cnt < *start; ++cnt) + if (groups[cnt] == grpbuf.gr_gid) + break; + + if (cnt == *start) + { + /* Matches user and not yet on the list. Insert + this group. */ + if (__glibc_unlikely (*start == *size)) + { + /* Need a bigger buffer. */ + gid_t *newgroups; + long int newsize; + + if (limit > 0 && *size == limit) + /* We reached the maximum. */ + goto done; + + if (limit <= 0) + newsize = 2 * *size; + else + newsize = MIN (limit, 2 * *size); + + newgroups = realloc (groups, + newsize * sizeof (*groups)); + if (newgroups == NULL) + goto done; + *groupsp = groups = newgroups; + *size = newsize; + } + + groups[*start] = grpbuf.gr_gid; + *start += 1; + } + + break; + } + } + } + while (status == NSS_STATUS_SUCCESS); + + done: + scratch_buffer_free (&tmpbuf); + + if (endgrent_fct) + DL_CALL_FCT (endgrent_fct, ()); + + return result; +} |