diff options
Diffstat (limited to 'nis/nss_nisplus/nisplus-rpc.c')
| -rw-r--r-- | nis/nss_nisplus/nisplus-rpc.c | 336 |
1 files changed, 189 insertions, 147 deletions
diff --git a/nis/nss_nisplus/nisplus-rpc.c b/nis/nss_nisplus/nisplus-rpc.c index 31d48d17a3..711c6bc273 100644 --- a/nis/nss_nisplus/nisplus-rpc.c +++ b/nis/nss_nisplus/nisplus-rpc.c @@ -1,4 +1,5 @@ -/* Copyright (C) 1997, 1998, 2001, 2002, 2003 Free Software Foundation, Inc. +/* Copyright (C) 1997, 1998, 2001, 2002, 2003, 2005, 2006, 2007 + Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997. @@ -17,13 +18,14 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#include <nss.h> -#include <errno.h> +#include <atomic.h> #include <ctype.h> +#include <errno.h> +#include <nss.h> #include <string.h> -#include <bits/libc-lock.h> #include <rpc/netdb.h> #include <rpcsvc/nis.h> +#include <bits/libc-lock.h> #include "nss-nisplus.h" @@ -33,11 +35,12 @@ static nis_result *result; static nis_name tablename_val; static u_long tablename_len; -#define NISENTRYVAL(idx,col,res) \ - ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val) +#define NISENTRYVAL(idx, col, res) \ + (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val) + +#define NISENTRYLEN(idx, col, res) \ + (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len) -#define NISENTRYLEN(idx,col,res) \ - ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len) static int _nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc, @@ -46,17 +49,16 @@ _nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc, char *first_unused = buffer; size_t room_left = buflen; unsigned int i; - char *p, *line; + char *line; if (result == NULL) return 0; if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) - || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ - || strcmp (result->objects.objects_val[0].EN_data.en_type, - "rpc_tbl") != 0 - || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3) + || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ + || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type, "rpc_tbl") != 0 + || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 3) return 0; if (NISENTRYLEN (0, 0, result) >= room_left) @@ -69,37 +71,43 @@ _nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc, NISENTRYLEN (0, 0, result)); first_unused[NISENTRYLEN (0, 0, result)] = '\0'; rpc->r_name = first_unused; - room_left -= (strlen (first_unused) + 1); - first_unused += strlen (first_unused) + 1; + size_t len = strlen (first_unused) + 1; + room_left -= len; + first_unused += len; + rpc->r_number = atoi (NISENTRYVAL (0, 2, result)); - p = first_unused; - line = p; - for (i = 0; i < result->objects.objects_len; ++i) + /* XXX Rewrite at some point to allocate the array first and then + copy the strings. It wasteful to first concatenate the strings + to just split them again later. */ + line = first_unused; + for (i = 0; i < NIS_RES_NUMOBJ (result); ++i) { if (strcmp (NISENTRYVAL (i, 1, result), rpc->r_name) != 0) { if (NISENTRYLEN (i, 1, result) + 2 > room_left) goto no_more_room; - *p++ = ' '; - p = __stpncpy (p, NISENTRYVAL (i, 1, result), - NISENTRYLEN (i, 1, result)); - *p = '\0'; - room_left -= (NISENTRYLEN (i, 1, result) + 1); + *first_unused++ = ' '; + first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result), + NISENTRYLEN (i, 1, result)); + room_left -= NISENTRYLEN (i, 1, result) + 1; } } - ++p; - first_unused = p; + *first_unused++ = '\0'; /* Adjust the pointer so it is aligned for storing pointers. */ - first_unused += __alignof__ (char *) - 1; - first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *)); - rpc->r_aliases = (char **) first_unused; - if (room_left < sizeof (char *)) + size_t adjust = ((__alignof__ (char *) + - (first_unused - (char *) 0) % __alignof__ (char *)) + % __alignof__ (char *)); + if (room_left < adjust + sizeof (char *)) goto no_more_room; + first_unused += adjust; + room_left -= adjust; + rpc->r_aliases = (char **) first_unused; + + /* For the terminating NULL pointer. */ room_left -= sizeof (char *); - rpc->r_aliases[0] = NULL; i = 0; while (*line != '\0') @@ -115,42 +123,45 @@ _nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc, goto no_more_room; room_left -= sizeof (char *); - rpc->r_aliases[i] = line; + rpc->r_aliases[i++] = line; while (*line != '\0' && *line != ' ') ++line; if (*line == ' ') - { - *line = '\0'; - ++line; - ++i; - } - else - rpc->r_aliases[i+1] = NULL; + *line++ = '\0'; } + rpc->r_aliases[i] = NULL; return 1; } + static enum nss_status _nss_create_tablename (int *errnop) { if (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[] = "rpc.org_dir."; - p = __stpcpy (buf, "rpc.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 (p == NULL) { *errnop = errno; return NSS_STATUS_TRYAGAIN; } - tablename_len = strlen (tablename_val); + + memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1); + + tablename_len = sizeof (prefix) - 1 + local_dir_len; + + atomic_write_barrier (); + + tablename_val = p; } + return NSS_STATUS_SUCCESS; } @@ -159,16 +170,20 @@ enum nss_status _nss_nisplus_setrpcent (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); + { + int err; + status = _nss_create_tablename (&err); + } __libc_lock_unlock (lock); @@ -180,9 +195,11 @@ _nss_nisplus_endrpcent (void) { __libc_lock_lock (lock); - if (result) - nis_freeresult (result); - result = NULL; + if (result != NULL) + { + nis_freeresult (result); + result = NULL; + } __libc_lock_unlock (lock); @@ -212,16 +229,23 @@ internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer, } result = nis_first_entry (tablename_val); + if (result == NULL) + { + *errnop = errno; + return NSS_STATUS_TRYAGAIN; + } 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 (tablename_val, &result->cookie); + if (result == NULL) + { + *errnop = errno; + return NSS_STATUS_TRYAGAIN; + } if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) { nis_freeresult (saved_res); @@ -243,7 +267,8 @@ internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer, if (saved_res) nis_freeresult (saved_res); } - } while (!parse_res); + } + while (!parse_res); return NSS_STATUS_SUCCESS; } @@ -271,77 +296,91 @@ _nss_nisplus_getrpcbyname_r (const char *name, struct rpcent *rpc, if (tablename_val == NULL) { + __libc_lock_lock (lock); + enum nss_status status = _nss_create_tablename (errnop); + __libc_lock_unlock (lock); + if (status != NSS_STATUS_SUCCESS) return status; } if (name == NULL) return NSS_STATUS_NOTFOUND; - else - { - nis_result *result; - char buf[strlen (name) + 255 + tablename_len]; - int olderr = errno; - /* Search at first in the alias list, and use the correct name - for the next search */ - sprintf (buf, "[name=%s],%s", name, tablename_val); - result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); + char buf[strlen (name) + 10 + tablename_len]; + int olderr = errno; - if (result != NULL) - { - /* If we do not find it, try it as original name. But if the - database is correct, we should find it in the first case, too */ - if ((result->status != NIS_SUCCESS - && result->status != NIS_S_SUCCESS) - || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ - || strcmp (result->objects.objects_val->EN_data.en_type, - "rpc_tbl") != 0 - || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3) - sprintf (buf, "[cname=%s],%s", name, tablename_val); - else - sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result), - tablename_val); - - nis_freeresult (result); - result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS , NULL, NULL); - } + /* Search at first in the alias list, and use the correct name + for the next search */ + snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val); + nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, + NULL, NULL); - if (result == NULL) + if (result != NULL) + { + char *bufptr = buf; + + /* If we did not find it, try it as original name. But if the + database is correct, we should find it in the first case, too */ + if ((result->status != NIS_SUCCESS + && result->status != NIS_S_SUCCESS) + || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ + || strcmp (result->objects.objects_val->EN_data.en_type, + "rpc_tbl") != 0 + || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3) + snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val); + else { - *errnop = ENOMEM; - return NSS_STATUS_TRYAGAIN; + /* We need to allocate a new buffer since there is no + guarantee the returned name has a length limit. */ + const char *entryval = NISENTRYVAL (0, 0, result); + size_t buflen = strlen (entryval) + 10 + tablename_len; + bufptr = alloca (buflen); + snprintf (bufptr, buflen, "[cname=%s],%s", + entryval, tablename_val); } - if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) - { - enum nss_status status = niserr2nss (result->status); - __set_errno (olderr); + nis_freeresult (result); + result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, + NULL, NULL); + } - nis_freeresult (result); - return status; - } + if (result == NULL) + { + *errnop = ENOMEM; + return NSS_STATUS_TRYAGAIN; + } - parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen, - errnop); + if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0)) + { + enum nss_status status = niserr2nss (result->status); + + __set_errno (olderr); nis_freeresult (result); + return status; + } - if (parse_res < 1) - { - if (parse_res == -1) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } + parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen, + errnop); - __set_errno (olderr); - return NSS_STATUS_NOTFOUND; + nis_freeresult (result); + + if (parse_res < 1) + { + if (parse_res == -1) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; } - return NSS_STATUS_SUCCESS; + + __set_errno (olderr); + return NSS_STATUS_NOTFOUND; } + + return NSS_STATUS_SUCCESS; } enum nss_status @@ -350,55 +389,58 @@ _nss_nisplus_getrpcbynumber_r (const int number, struct rpcent *rpc, { if (tablename_val == NULL) { + __libc_lock_lock (lock); + enum nss_status status = _nss_create_tablename (errnop); + __libc_lock_unlock (lock); + if (status != NSS_STATUS_SUCCESS) return status; } - { - int parse_res; - nis_result *result; - char buf[100 + tablename_len]; - int olderr = errno; + char buf[12 + 3 * sizeof (number) + tablename_len]; + int olderr = errno; - sprintf (buf, "[number=%d],%s", number, tablename_val); + snprintf (buf, sizeof (buf), "[number=%d],%s", number, tablename_val); - result = nis_list(buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL); + nis_result *result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH | USE_DGRAM, + 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_rpcent (result, rpc, 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; + } + + int parse_res = _nss_nisplus_parse_rpcent (result, rpc, 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; } |