diff options
Diffstat (limited to 'nis/nss_nisplus/nisplus-pwd.c')
| -rw-r--r-- | nis/nss_nisplus/nisplus-pwd.c | 239 |
1 files changed, 127 insertions, 112 deletions
diff --git a/nis/nss_nisplus/nisplus-pwd.c b/nis/nss_nisplus/nisplus-pwd.c index 8f3bc997b3..97679dd349 100644 --- a/nis/nss_nisplus/nisplus-pwd.c +++ b/nis/nss_nisplus/nisplus-pwd.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1997, 1999, 2001, 2002, 2003 Free Software Foundation, Inc. +/* Copyright (C) 1997,1999,2001,2002,2003,2005 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997. @@ -17,6 +17,7 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#include <atomic.h> #include <nss.h> #include <errno.h> #include <pwd.h> @@ -30,27 +31,39 @@ __libc_lock_define_initialized (static, lock) static nis_result *result; -static nis_name tablename_val; -static u_long tablename_len; +nis_name pwd_tablename_val attribute_hidden; +size_t pwd_tablename_len attribute_hidden; -static enum nss_status -_nss_create_tablename (int *errnop) +enum nss_status +_nss_pwd_create_tablename (int *errnop) { - if (tablename_val == NULL) + if (pwd_tablename_val == NULL) { - char buf [40 + strlen (nis_local_directory ())]; - char *p; + const char *local_dir = nis_local_directory (); + size_t local_dir_len = strlen (local_dir); + static const char prefix[] = "passwd.org_dir."; - p = __stpcpy (buf, "passwd.org_dir."); - p = __stpcpy (p, nis_local_directory ()); - tablename_val = __strdup (buf); - if (tablename_val == NULL) + char *p = malloc (sizeof (prefix) + local_dir_len); + if (pwd_tablename_val == NULL) { *errnop = errno; return NSS_STATUS_TRYAGAIN; } - tablename_len = strlen (tablename_val); + + memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1); + + pwd_tablename_len = sizeof (prefix) - 1 + local_dir_len; + + atomic_write_barrier (); + + if (atomic_compare_and_exchange_bool_acq (&pwd_tablename_val, p, NULL)) + { + /* Another thread already installed the value. */ + free (p); + pwd_tablename_len = strlen (pwd_tablename_val); + } } + return NSS_STATUS_SUCCESS; } @@ -59,16 +72,20 @@ enum nss_status _nss_nisplus_setpwent (int stayopen) { enum nss_status status = NSS_STATUS_SUCCESS; - int err; __libc_lock_lock (lock); - if (result) - nis_freeresult (result); - result = NULL; + if (result != NULL) + { + nis_freeresult (result); + result = NULL; + } - if (tablename_val == NULL) - status = _nss_create_tablename (&err); + if (pwd_tablename_val == NULL) + { + int err; + status = _nss_pwd_create_tablename (&err); + } __libc_lock_unlock (lock); @@ -80,9 +97,11 @@ _nss_nisplus_endpwent (void) { __libc_lock_lock (lock); - if (result) - nis_freeresult (result); - result = NULL; + if (result != NULL) + { + nis_freeresult (result); + result = NULL; + } __libc_lock_unlock (lock); @@ -103,25 +122,22 @@ internal_nisplus_getpwent_r (struct passwd *pw, char *buffer, size_t buflen, if (result == NULL) { saved_res = NULL; - if (tablename_val == NULL) + if (pwd_tablename_val == NULL) { - enum nss_status status = _nss_create_tablename (errnop); + enum nss_status status = _nss_pwd_create_tablename (errnop); if (status != NSS_STATUS_SUCCESS) return status; } - result = nis_first_entry (tablename_val); + result = nis_first_entry (pwd_tablename_val); if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) return niserr2nss (result->status); } else { - nis_result *res; - saved_res = result; - res = nis_next_entry (tablename_val, &result->cookie); - result = res; + result = nis_next_entry (pwd_tablename_val, &result->cookie); if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) { nis_freeresult (saved_res); @@ -131,19 +147,18 @@ internal_nisplus_getpwent_r (struct passwd *pw, char *buffer, size_t buflen, parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop); - if (parse_res == -1) + if (__builtin_expect (parse_res == -1, 0)) { nis_freeresult (result); result = saved_res; *errnop = ERANGE; return NSS_STATUS_TRYAGAIN; } - else - { - if (saved_res) - nis_freeresult (saved_res); - } - } while (!parse_res); + + if (saved_res) + nis_freeresult (saved_res); + } + while (!parse_res); return NSS_STATUS_SUCCESS; } @@ -169,9 +184,9 @@ _nss_nisplus_getpwnam_r (const char *name, struct passwd *pw, { int parse_res; - if (tablename_val == NULL) + if (pwd_tablename_val == NULL) { - enum nss_status status = _nss_create_tablename (errnop); + enum nss_status status = _nss_pwd_create_tablename (errnop); if (status != NSS_STATUS_SUCCESS) return status; @@ -182,107 +197,107 @@ _nss_nisplus_getpwnam_r (const char *name, struct passwd *pw, *errnop = EINVAL; return NSS_STATUS_UNAVAIL; } - else - { - nis_result *result; - char buf[strlen (name) + 24 + tablename_len]; - int olderr = errno; - sprintf (buf, "[name=%s],%s", name, tablename_val); + nis_result *result; + char buf[strlen (name) + 9 + pwd_tablename_len]; + int olderr = errno; - result = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); + snprintf (buf, sizeof (buf), "[name=%s],%s", name, pwd_tablename_val); - if (result == NULL) - { - *errnop = ENOMEM; - return NSS_STATUS_TRYAGAIN; - } - if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) - { - enum nss_status status = niserr2nss (result->status); + result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); - __set_errno (olderr); + if (result == NULL) + { + *errnop = ENOMEM; + return NSS_STATUS_TRYAGAIN; + } - nis_freeresult (result); - return status; - } + if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0)) + { + enum nss_status status = niserr2nss (result->status); - parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, - errnop); + __set_errno (olderr); nis_freeresult (result); + return status; + } + + parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop); + + nis_freeresult (result); - if (parse_res < 1) + if (__builtin_expect (parse_res < 1, 0)) + { + if (parse_res == -1) { - if (parse_res == -1) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - else - { - __set_errno (olderr); - return NSS_STATUS_NOTFOUND; - } + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + else + { + __set_errno (olderr); + return NSS_STATUS_NOTFOUND; } - return NSS_STATUS_SUCCESS; } + + return NSS_STATUS_SUCCESS; } enum nss_status _nss_nisplus_getpwuid_r (const uid_t uid, struct passwd *pw, char *buffer, size_t buflen, int *errnop) { - if (tablename_val == NULL) + if (pwd_tablename_val == NULL) { - enum nss_status status = _nss_create_tablename (errnop); + enum nss_status status = _nss_pwd_create_tablename (errnop); if (status != NSS_STATUS_SUCCESS) return status; } - { - int parse_res; - nis_result *result; - char buf[100 + tablename_len]; - int olderr = errno; + int parse_res; + nis_result *result; + char buf[8 + 3 * sizeof (unsigned long int) + pwd_tablename_len]; + int olderr = errno; - sprintf (buf, "[uid=%lu],%s", (unsigned long int) uid, tablename_val); + snprintf (buf, sizeof (buf), "[uid=%lu],%s", + (unsigned long int) uid, pwd_tablename_val); - result = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); + result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); - if (result == NULL) - { - *errnop = ENOMEM; - return NSS_STATUS_TRYAGAIN; - } - if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) - { - enum nss_status status = niserr2nss (result->status); + if (result == NULL) + { + *errnop = ENOMEM; + return NSS_STATUS_TRYAGAIN; + } - __set_errno (olderr); + if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0)) + { + enum nss_status status = niserr2nss (result->status); - nis_freeresult (result); - return status; - } - - parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop); - - nis_freeresult (result); - - if (parse_res < 1) - { - if (parse_res == -1) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - else - { - __set_errno (olderr); - return NSS_STATUS_NOTFOUND; - } - } - return NSS_STATUS_SUCCESS; - } + __set_errno (olderr); + + nis_freeresult (result); + return status; + } + + parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop); + + nis_freeresult (result); + + if (__builtin_expect (parse_res < 1, 0)) + { + if (parse_res == -1) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + else + { + __set_errno (olderr); + return NSS_STATUS_NOTFOUND; + } + } + + return NSS_STATUS_SUCCESS; } |