diff options
Diffstat (limited to 'REORG.TODO/nis/nss_nisplus/nisplus-network.c')
| -rw-r--r-- | REORG.TODO/nis/nss_nisplus/nisplus-network.c | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/REORG.TODO/nis/nss_nisplus/nisplus-network.c b/REORG.TODO/nis/nss_nisplus/nisplus-network.c new file mode 100644 index 0000000000..ad266b9f6d --- /dev/null +++ b/REORG.TODO/nis/nss_nisplus/nisplus-network.c @@ -0,0 +1,494 @@ +/* Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <atomic.h> +#include <ctype.h> +#include <errno.h> +#include <netdb.h> +#include <nss.h> +#include <stdint.h> +#include <string.h> +#include <arpa/inet.h> +#include <rpcsvc/nis.h> +#include <libc-lock.h> + +#include "nss-nisplus.h" + +__libc_lock_define_initialized (static, lock) + +static nis_result *result; +static nis_name tablename_val; +static u_long tablename_len; + +#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) + + +static int +_nss_nisplus_parse_netent (nis_result *result, struct netent *network, + char *buffer, size_t buflen, int *errnop) +{ + char *first_unused = buffer; + size_t room_left = buflen; + + if (result == NULL) + return 0; + + if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) + || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ + || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type, + "networks_tbl") != 0 + || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 3) + return 0; + + if (NISENTRYLEN (0, 0, result) >= room_left) + { + /* The line is too long for our buffer. */ + no_more_room: + *errnop = ERANGE; + return -1; + } + + strncpy (first_unused, NISENTRYVAL (0, 0, result), + NISENTRYLEN (0, 0, result)); + first_unused[NISENTRYLEN (0, 0, result)] = '\0'; + network->n_name = first_unused; + size_t len = strlen (first_unused) + 1; + room_left -= len; + first_unused += len; + + network->n_addrtype = 0; + network->n_net = inet_network (NISENTRYVAL (0, 2, result)); + + /* 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), network->n_name) != 0) + { + if (NISENTRYLEN (i, 1, result) + 2 > room_left) + goto no_more_room; + + *first_unused++ = ' '; + first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result), + NISENTRYLEN (i, 1, result)); + room_left -= (NISENTRYLEN (i, 1, result) + 1); + } + } + *first_unused++ = '\0'; + + /* Adjust the pointer so it is aligned for + storing pointers. */ + 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; + network->n_aliases = (char **) first_unused; + + /* For the terminating NULL pointer. */ + room_left -= sizeof (char *); + + unsigned int i = 0; + while (*line != '\0') + { + /* Skip leading blanks. */ + while (isspace (*line)) + ++line; + + if (*line == '\0') + break; + + if (room_left < sizeof (char *)) + goto no_more_room; + + room_left -= sizeof (char *); + network->n_aliases[i++] = line; + + while (*line != '\0' && *line != ' ') + ++line; + + if (*line == ' ') + *line++ = '\0'; + } + network->n_aliases[i] = NULL; + + return 1; +} + + +static enum nss_status +_nss_create_tablename (int *errnop) +{ + if (tablename_val == NULL) + { + const char *local_dir = nis_local_directory (); + size_t local_dir_len = strlen (local_dir); + static const char prefix[] = "networks.org_dir."; + + char *p = malloc (sizeof (prefix) + local_dir_len); + if (p == NULL) + { + *errnop = errno; + return NSS_STATUS_TRYAGAIN; + } + + 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; +} + +enum nss_status +_nss_nisplus_setnetent (int stayopen) +{ + enum nss_status status = NSS_STATUS_SUCCESS; + + __libc_lock_lock (lock); + + if (result != NULL) + { + nis_freeresult (result); + result = NULL; + } + + if (tablename_val == NULL) + { + int err; + status = _nss_create_tablename (&err); + } + + __libc_lock_unlock (lock); + + return status; +} + +enum nss_status +_nss_nisplus_endnetent (void) +{ + __libc_lock_lock (lock); + + if (result != NULL) + { + nis_freeresult (result); + result = NULL; + } + + __libc_lock_unlock (lock); + + return NSS_STATUS_SUCCESS; +} + +static enum nss_status +internal_nisplus_getnetent_r (struct netent *network, char *buffer, + size_t buflen, int *errnop, int *herrnop) +{ + int parse_res; + + /* Get the next entry until we found a correct one. */ + do + { + nis_result *saved_res; + + if (result == NULL) + { + saved_res = NULL; + + if (tablename_val == NULL) + { + enum nss_status status = _nss_create_tablename (errnop); + + if (status != NSS_STATUS_SUCCESS) + return status; + } + + result = nis_first_entry (tablename_val); + if (result == NULL) + { + *errnop = errno; + return NSS_STATUS_TRYAGAIN; + } + if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) + { + int retval = niserr2nss (result->status); + nis_freeresult (result); + result = NULL; + if (retval == NSS_STATUS_TRYAGAIN) + { + *herrnop = NETDB_INTERNAL; + *errnop = errno; + return retval; + } + else + return retval; + } + } + else + { + saved_res = result; + result = nis_next_entry (tablename_val, &result->cookie); + if (result == NULL) + { + *errnop = errno; + return NSS_STATUS_TRYAGAIN; + } + if (niserr2nss (result->status) != NSS_STATUS_SUCCESS) + { + int retval = niserr2nss (result->status); + nis_freeresult (result); + result = saved_res; + if (retval == NSS_STATUS_TRYAGAIN) + { + *herrnop = NETDB_INTERNAL; + *errnop = errno; + } + return retval; + } + } + + parse_res = _nss_nisplus_parse_netent (result, network, buffer, + buflen, errnop); + if (parse_res == -1) + { + *herrnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + } + while (!parse_res); + + return NSS_STATUS_SUCCESS; +} + +enum nss_status +_nss_nisplus_getnetent_r (struct netent *result, char *buffer, + size_t buflen, int *errnop, int *herrnop) +{ + int status; + + __libc_lock_lock (lock); + + status = internal_nisplus_getnetent_r (result, buffer, buflen, errnop, + herrnop); + + __libc_lock_unlock (lock); + + return status; +} + +enum nss_status +_nss_nisplus_getnetbyname_r (const char *name, struct netent *network, + char *buffer, size_t buflen, int *errnop, + int *herrnop) +{ + int parse_res, retval; + + 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) + { + *errnop = EINVAL; + *herrnop = NETDB_INTERNAL; + return NSS_STATUS_UNAVAIL; + } + + nis_result *result; + char buf[strlen (name) + 10 + tablename_len]; + int olderr = errno; + + /* 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); + result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH | USE_DGRAM, NULL, NULL); + + if (result != NULL) + { + char *bufptr = buf; + + /* 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[0].EN_data.en_type, + "networks_tbl") != 0 + || (result->objects.objects_val[0].EN_data.en_cols.en_cols_len + < 3)) + snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val); + else + { + /* 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); + } + + nis_freeresult (result); + result = nis_list (bufptr, FOLLOW_LINKS | FOLLOW_PATH | USE_DGRAM, + NULL, NULL); + } + + if (result == NULL) + { + __set_errno (ENOMEM); + return NSS_STATUS_TRYAGAIN; + } + + retval = niserr2nss (result->status); + if (__glibc_unlikely (retval != NSS_STATUS_SUCCESS)) + { + if (retval == NSS_STATUS_TRYAGAIN) + { + *errnop = errno; + *herrnop = NETDB_INTERNAL; + } + else + __set_errno (olderr); + nis_freeresult (result); + return retval; + } + + parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen, + errnop); + + nis_freeresult (result); + + if (parse_res > 0) + return NSS_STATUS_SUCCESS; + + *herrnop = NETDB_INTERNAL; + if (parse_res == -1) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + __set_errno (olderr); + return NSS_STATUS_NOTFOUND; +} + +/* XXX type is ignored, SUN's NIS+ table doesn't support it */ +enum nss_status +_nss_nisplus_getnetbyaddr_r (uint32_t addr, const int type, + struct netent *network, char *buffer, + size_t buflen, int *errnop, int *herrnop) +{ + 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; + } + + { + char buf[27 + tablename_len]; + char buf2[18]; + int olderr = errno; + + struct in_addr in = { .s_addr = htonl (addr) }; + strcpy (buf2, inet_ntoa (in)); + size_t b2len = strlen (buf2); + + while (1) + { + snprintf (buf, sizeof (buf), "[addr=%s],%s", buf2, tablename_val); + nis_result *result = nis_list (buf, EXPAND_NAME | USE_DGRAM, + NULL, NULL); + + if (result == NULL) + { + __set_errno (ENOMEM); + return NSS_STATUS_TRYAGAIN; + } + enum nss_status retval = niserr2nss (result->status); + if (__glibc_unlikely (retval != NSS_STATUS_SUCCESS)) + { + if (b2len > 2 && buf2[b2len - 2] == '.' && buf2[b2len - 1] == '0') + { + /* Try again, but with trailing dot(s) + removed (one by one) */ + buf2[b2len - 2] = '\0'; + b2len -= 2; + nis_freeresult (result); + continue; + } + + if (retval == NSS_STATUS_TRYAGAIN) + { + *errnop = errno; + *herrnop = NETDB_INTERNAL; + } + else + __set_errno (olderr); + nis_freeresult (result); + return retval; + } + + int parse_res = _nss_nisplus_parse_netent (result, network, buffer, + buflen, errnop); + + nis_freeresult (result); + + if (parse_res > 0) + return NSS_STATUS_SUCCESS; + + *herrnop = NETDB_INTERNAL; + if (parse_res == -1) + { + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + else + { + __set_errno (olderr); + return NSS_STATUS_NOTFOUND; + } + } + } +} |