diff options
Diffstat (limited to 'nis/nss_nisplus/nisplus-service.c')
| -rw-r--r-- | nis/nss_nisplus/nisplus-service.c | 341 |
1 files changed, 188 insertions, 153 deletions
diff --git a/nis/nss_nisplus/nisplus-service.c b/nis/nss_nisplus/nisplus-service.c index fbb6987e9e..607ce80b01 100644 --- a/nis/nss_nisplus/nisplus-service.c +++ b/nis/nss_nisplus/nisplus-service.c @@ -1,4 +1,5 @@ -/* Copyright (C) 1997,1998,1999,2001,2002,2003 Free Software Foundation, Inc. +/* Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003, 2005, 2006, 2007 + Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Thorsten Kukuk <kukuk@suse.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 <netdb.h> +#include <nss.h> #include <string.h> -#include <bits/libc-lock.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_servent (nis_result *result, struct servent *serv, @@ -45,17 +48,14 @@ _nss_nisplus_parse_servent (nis_result *result, struct servent *serv, { char *first_unused = buffer; size_t room_left = buflen; - unsigned int i; - char *p, *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->EN_data.en_type, - "services_tbl") != 0 - || result->objects.objects_val->EN_data.en_cols.en_cols_len < 4) + || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ + || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type, "services_tbl") != 0 + || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4) return 0; if (NISENTRYLEN (0, 0, result) >= room_left) @@ -68,8 +68,9 @@ _nss_nisplus_parse_servent (nis_result *result, struct servent *serv, NISENTRYLEN (0, 0, result)); first_unused[NISENTRYLEN (0, 0, result)] = '\0'; serv->s_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; if (NISENTRYLEN (0, 2, result) >= room_left) goto no_more_room; @@ -77,40 +78,45 @@ _nss_nisplus_parse_servent (nis_result *result, struct servent *serv, NISENTRYLEN (0, 2, result)); first_unused[NISENTRYLEN (0, 2, result)] = '\0'; serv->s_proto = first_unused; - room_left -= strlen (first_unused) + 1; - first_unused += strlen (first_unused) + 1; + len = strlen (first_unused) + 1; + room_left -= len; + first_unused += len; serv->s_port = htons (atoi (NISENTRYVAL (0, 3, 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. */ + char *line = first_unused; + for (unsigned int i = 0; i < NIS_RES_NUMOBJ (result); ++i) { if (strcmp (NISENTRYVAL (i, 1, result), serv->s_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++ = '\0'; - 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 *)); - serv->s_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; + serv->s_aliases = (char **) first_unused; + + /* For the terminating NULL pointer. */ room_left -= (sizeof (char *)); - serv->s_aliases[0] = NULL; - i = 0; + unsigned int i = 0; while (*line != '\0') { /* Skip leading blanks. */ @@ -124,42 +130,45 @@ _nss_nisplus_parse_servent (nis_result *result, struct servent *serv, goto no_more_room; room_left -= sizeof (char *); - serv->s_aliases[i] = line; + serv->s_aliases[i++] = line; while (*line != '\0' && *line != ' ') ++line; if (*line == ' ') - { - *line = '\0'; - ++line; - ++i; - } - else - serv->s_aliases[i+1] = NULL; + *line++ = '\0'; } + serv->s_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[] = "services.org_dir."; - p = __stpcpy (buf, "services.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; } @@ -172,9 +181,11 @@ _nss_nisplus_setservent (int stayopen) __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); @@ -189,9 +200,11 @@ _nss_nisplus_endservent (void) { __libc_lock_lock (lock); - if (result) - nis_freeresult (result); - result = NULL; + if (result != NULL) + { + nis_freeresult (result); + result = NULL; + } __libc_lock_unlock (lock); @@ -221,16 +234,23 @@ internal_nisplus_getservent_r (struct servent *serv, 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); @@ -240,7 +260,7 @@ internal_nisplus_getservent_r (struct servent *serv, char *buffer, parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen, errnop); - if (parse_res == -1) + if (__builtin_expect (parse_res == -1, 0)) { nis_freeresult (result); result = saved_res; @@ -262,11 +282,9 @@ enum nss_status _nss_nisplus_getservent_r (struct servent *result, char *buffer, size_t buflen, int *errnop) { - int status; - __libc_lock_lock (lock); - status = internal_nisplus_getservent_r (result, buffer, buflen, errnop); + int status = internal_nisplus_getservent_r (result, buffer, buflen, errnop); __libc_lock_unlock (lock); @@ -278,12 +296,14 @@ _nss_nisplus_getservbyname_r (const char *name, const char *protocol, struct servent *serv, char *buffer, size_t buflen, int *errnop) { - int parse_res; - 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; } @@ -293,72 +313,84 @@ _nss_nisplus_getservbyname_r (const char *name, const char *protocol, *errnop = EINVAL; 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,proto=%s],%s", name, protocol, - tablename_val); - result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); + size_t protocol_len = strlen (protocol); + char buf[strlen (name) + protocol_len + 17 + 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, - "services_tbl") != 0 - || result->objects.objects_val->EN_data.en_cols.en_cols_len < 4) - sprintf (buf, "[cname=%s,proto=%s],%s", name, protocol, - tablename_val); - else - sprintf (buf, "[cname=%s,proto=%s],%s", - NISENTRYVAL (0, 0, result), protocol, 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,proto=%s],%s", name, protocol, + 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 (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ + || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type, + "services_tbl") != 0 + || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4) + snprintf (buf, sizeof (buf), "[cname=%s,proto=%s],%s", name, protocol, + 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) + protocol_len + 17 + + tablename_len); + bufptr = alloca (buflen); + snprintf (bufptr, buflen, "[cname=%s,proto=%s],%s", + entryval, protocol, 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; + } + + if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0)) + { + enum nss_status status = niserr2nss (result->status); + + __set_errno (olderr); - parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen, - errnop); nis_freeresult (result); + return status; + } - if (parse_res < 1) + int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen, + errnop); + nis_freeresult (result); + + 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 @@ -368,8 +400,12 @@ _nss_nisplus_getservbyport_r (const int number, const char *protocol, { 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; } @@ -379,50 +415,49 @@ _nss_nisplus_getservbyport_r (const int number, const char *protocol, *errnop = EINVAL; return NSS_STATUS_NOTFOUND; } - else - { - int parse_res; - nis_result *result; - char buf[60 + strlen (protocol) + tablename_len]; - int olderr = errno; - sprintf (buf, "[port=%d,proto=%s],%s", - number, protocol, tablename_val); + char buf[17 + 3 * sizeof (int) + strlen (protocol) + tablename_len]; + int olderr = errno; - result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); + snprintf (buf, sizeof (buf), "[port=%d,proto=%s],%s", + number, protocol, 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); + nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, + 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); + + __set_errno (olderr); - parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen, - errnop); nis_freeresult (result); + return status; + } - if (parse_res < 1) + int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen, + errnop); + nis_freeresult (result); + + 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; } |