diff options
Diffstat (limited to 'REORG.TODO/nis/nss_nisplus/nisplus-hosts.c')
-rw-r--r-- | REORG.TODO/nis/nss_nisplus/nisplus-hosts.c | 619 |
1 files changed, 619 insertions, 0 deletions
diff --git a/REORG.TODO/nis/nss_nisplus/nisplus-hosts.c b/REORG.TODO/nis/nss_nisplus/nisplus-hosts.c new file mode 100644 index 0000000000..31dfd31fbd --- /dev/null +++ b/REORG.TODO/nis/nss_nisplus/nisplus-hosts.c @@ -0,0 +1,619 @@ +/* Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Thorsten Kukuk <kukuk@suse.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 <assert.h> +#include <atomic.h> +#include <ctype.h> +#include <errno.h> +#include <netdb.h> +#include <nss.h> +#include <string.h> +#include <arpa/inet.h> +#include <netinet/in.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) + +/* Get implementation for some internal functions. */ +#include <resolv/resolv-internal.h> +#include <resolv/mapv4v6addr.h> + + +static int +_nss_nisplus_parse_hostent (nis_result *result, int af, struct hostent *host, + char *buffer, size_t buflen, int *errnop, + int flags) +{ + unsigned int i; + 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, "hosts_tbl") != 0 + || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 4) + return 0; + + char *data = first_unused; + + if (room_left < (af != AF_INET || (flags & AI_V4MAPPED) != 0 + ? IN6ADDRSZ : INADDRSZ)) + { + no_more_room: + *errnop = ERANGE; + return -1; + } + + /* Parse address. */ + if (af != AF_INET6 + && inet_pton (AF_INET, NISENTRYVAL (0, 2, result), data) > 0) + { + assert ((flags & AI_V4MAPPED) == 0 || af != AF_UNSPEC); + if (flags & AI_V4MAPPED) + { + map_v4v6_address (data, data); + host->h_addrtype = AF_INET6; + host->h_length = IN6ADDRSZ; + } + else + { + host->h_addrtype = AF_INET; + host->h_length = INADDRSZ; + } + } + else if (af != AF_INET + && inet_pton (AF_INET6, NISENTRYVAL (0, 2, result), data) > 0) + { + host->h_addrtype = AF_INET6; + host->h_length = IN6ADDRSZ; + } + else + /* Illegal address: ignore line. */ + return 0; + + first_unused += host->h_length; + room_left -= host->h_length; + + if (NISENTRYLEN (0, 0, result) + 1 > room_left) + goto no_more_room; + + host->h_name = first_unused; + first_unused = __stpncpy (first_unused, NISENTRYVAL (0, 0, result), + NISENTRYLEN (0, 0, result)); + *first_unused++ = '\0'; + + room_left -= NISENTRYLEN (0, 0, result) + 1; + char *line = first_unused; + + /* When this is a call to gethostbyname4_r we do not need the aliases. */ + if (af != AF_UNSPEC) + { + /* XXX Rewrite at some point to allocate the array first and then + copy the strings. It is wasteful to first concatenate the strings + to just split them again later. */ + for (i = 0; i < NIS_RES_NUMOBJ (result); ++i) + { + if (strcmp (NISENTRYVAL (i, 1, result), host->h_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)); + *first_unused = '\0'; + 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 + 3 * sizeof (char *)) + goto no_more_room; + first_unused += adjust; + room_left -= adjust; + host->h_addr_list = (char **) first_unused; + + room_left -= 3 * sizeof (char *); + host->h_addr_list[0] = data; + host->h_addr_list[1] = NULL; + host->h_aliases = &host->h_addr_list[2]; + + /* When this is a call to gethostbyname4_r we do not need the aliases. */ + if (af != AF_UNSPEC) + { + 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 *); + host->h_aliases[i++] = line; + + while (*line != '\0' && *line != ' ') + ++line; + + if (*line == ' ') + *line++ = '\0'; + } + + host->h_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[] = "hosts.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_sethostent (int stayopen) +{ + enum nss_status status = NSS_STATUS_SUCCESS; + int err; + + __libc_lock_lock (lock); + + if (result != NULL) + { + nis_freeresult (result); + result = NULL; + } + + if (tablename_val == NULL) + status = _nss_create_tablename (&err); + + __libc_lock_unlock (lock); + + return status; +} + + +enum nss_status +_nss_nisplus_endhostent (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_gethostent_r (struct hostent *host, 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) + { + enum nss_status retval = niserr2nss (result->status); + if (retval == NSS_STATUS_TRYAGAIN) + { + *herrnop = NETDB_INTERNAL; + *errnop = errno; + } + 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) + { + enum nss_status retval= niserr2nss (result->status); + + nis_freeresult (result); + result = saved_res; + if (retval == NSS_STATUS_TRYAGAIN) + { + *herrnop = NETDB_INTERNAL; + *errnop = errno; + } + return retval; + } + } + + if (res_use_inet6 ()) + parse_res = _nss_nisplus_parse_hostent (result, AF_INET6, host, buffer, + buflen, errnop, AI_V4MAPPED); + else + parse_res = _nss_nisplus_parse_hostent (result, AF_INET, host, buffer, + buflen, errnop, 0); + + if (parse_res == -1) + { + nis_freeresult (result); + result = saved_res; + *herrnop = NETDB_INTERNAL; + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + if (saved_res != NULL) + nis_freeresult (saved_res); + + } while (!parse_res); + + return NSS_STATUS_SUCCESS; +} + + +enum nss_status +_nss_nisplus_gethostent_r (struct hostent *result, char *buffer, + size_t buflen, int *errnop, int *herrnop) +{ + int status; + + __libc_lock_lock (lock); + + status = internal_nisplus_gethostent_r (result, buffer, buflen, errnop, + herrnop); + + __libc_lock_unlock (lock); + + return status; +} + + +static enum nss_status +get_tablename (int *herrnop) +{ + __libc_lock_lock (lock); + + enum nss_status status = _nss_create_tablename (herrnop); + + __libc_lock_unlock (lock); + + if (status != NSS_STATUS_SUCCESS) + *herrnop = NETDB_INTERNAL; + + return status; +} + + +static enum nss_status +internal_gethostbyname2_r (const char *name, int af, struct hostent *host, + char *buffer, size_t buflen, int *errnop, + int *herrnop, int flags) +{ + if (tablename_val == NULL) + { + enum nss_status status = get_tablename (herrnop); + if (status != NSS_STATUS_SUCCESS) + return status; + } + + if (name == NULL) + { + *errnop = EINVAL; + *herrnop = NETDB_INTERNAL; + return NSS_STATUS_NOTFOUND; + } + + 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); + nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); + + if (result != NULL) + { + /* 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. */ + char *bufptr = buf; + size_t buflen = sizeof (buf); + + 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, + "hosts_tbl") == 0 + && result->objects.objects_val->EN_data.en_cols.en_cols_len >= 3) + { + /* We need to allocate a new buffer since there is no + guarantee the returned alias name has a length limit. */ + name = NISENTRYVAL(0, 0, result); + size_t buflen = strlen (name) + 10 + tablename_len; + bufptr = alloca (buflen); + } + + snprintf (bufptr, buflen, "[cname=%s],%s", name, tablename_val); + + nis_freeresult (result); + result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); + } + + if (result == NULL) + { + *errnop = ENOMEM; + *herrnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + int retval = niserr2nss (result->status); + if (__glibc_unlikely (retval != NSS_STATUS_SUCCESS)) + { + if (retval == NSS_STATUS_TRYAGAIN) + { + *errnop = errno; + *herrnop = TRY_AGAIN; + } + else + { + __set_errno (olderr); + *herrnop = NETDB_INTERNAL; + } + nis_freeresult (result); + return retval; + } + + int parse_res = _nss_nisplus_parse_hostent (result, af, host, buffer, + buflen, errnop, flags); + + 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; +} + + +enum nss_status +_nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host, + char *buffer, size_t buflen, int *errnop, + int *herrnop) +{ + if (af != AF_INET && af != AF_INET6) + { + *herrnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + + return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop, + herrnop, + (res_use_inet6 () ? AI_V4MAPPED : 0)); +} + + +enum nss_status +_nss_nisplus_gethostbyname_r (const char *name, struct hostent *host, + char *buffer, size_t buflen, int *errnop, + int *h_errnop) +{ + if (res_use_inet6 ()) + { + enum nss_status status; + + status = internal_gethostbyname2_r (name, AF_INET6, host, buffer, + buflen, errnop, h_errnop, + AI_V4MAPPED); + if (status == NSS_STATUS_SUCCESS) + return status; + } + + return internal_gethostbyname2_r (name, AF_INET, host, buffer, + buflen, errnop, h_errnop, 0); +} + + +enum nss_status +_nss_nisplus_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af, + struct hostent *host, char *buffer, + size_t buflen, int *errnop, int *herrnop) +{ + if (tablename_val == NULL) + { + enum nss_status status = get_tablename (herrnop); + if (status != NSS_STATUS_SUCCESS) + return status; + } + + if (addr == NULL) + return NSS_STATUS_NOTFOUND; + + char buf[24 + tablename_len]; + int retval, parse_res; + int olderr = errno; + + snprintf (buf, sizeof (buf), "[addr=%s],%s", + inet_ntoa (*(const struct in_addr *) addr), tablename_val); + nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, 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_hostent (result, af, host, + buffer, buflen, errnop, + (res_use_inet6 () + ? AI_V4MAPPED : 0)); + 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; +} + + +enum nss_status +_nss_nisplus_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat, + char *buffer, size_t buflen, int *errnop, + int *herrnop, int32_t *ttlp) +{ + struct hostent host; + + enum nss_status status = internal_gethostbyname2_r (name, AF_UNSPEC, &host, + buffer, buflen, + errnop, herrnop, 0); + if (__glibc_likely (status == NSS_STATUS_SUCCESS)) + { + if (*pat == NULL) + { + uintptr_t pad = (-(uintptr_t) buffer + % __alignof__ (struct gaih_addrtuple)); + buffer += pad; + buflen = buflen > pad ? buflen - pad : 0; + + if (__glibc_unlikely (buflen < sizeof (struct gaih_addrtuple))) + { + free (result); + *errnop = ERANGE; + *herrnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + } + + (*pat)->next = NULL; + (*pat)->name = host.h_name; + (*pat)->family = host.h_addrtype; + + memcpy ((*pat)->addr, host.h_addr_list[0], host.h_length); + (*pat)->scopeid = 0; + assert (host.h_addr_list[1] == NULL); + } + + return status; +} |