diff options
Diffstat (limited to 'REORG.TODO/nis/nss_nis/nis-alias.c')
| -rw-r--r-- | REORG.TODO/nis/nss_nis/nis-alias.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/REORG.TODO/nis/nss_nis/nis-alias.c b/REORG.TODO/nis/nss_nis/nis-alias.c new file mode 100644 index 0000000000..c9c89db6ce --- /dev/null +++ b/REORG.TODO/nis/nss_nis/nis-alias.c @@ -0,0 +1,281 @@ +/* Copyright (C) 1996-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996. + + 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 <nss.h> +#include <ctype.h> +#include <errno.h> +#include <string.h> +#include <aliases.h> +#include <libc-lock.h> +#include <rpcsvc/yp.h> +#include <rpcsvc/ypclnt.h> + +#include "nss-nis.h" + +__libc_lock_define_initialized (static, lock) + +static bool_t new_start = 1; +static char *oldkey; +static int oldkeylen; + +static int +_nss_nis_parse_aliasent (const char *key, char *alias, struct aliasent *result, + char *buffer, size_t buflen, int *errnop) +{ + char *first_unused = buffer + strlen (alias) + 1; + size_t room_left = + buflen - (buflen % __alignof__ (char *)) - strlen (alias) - 2; + char *line; + char *cp; + + result->alias_members_len = 0; + *first_unused = '\0'; + first_unused++; + strcpy (first_unused, key); + + if (first_unused[room_left - 1] != '\0') + { + /* The line is too long for our buffer. */ + no_more_room: + *errnop = ERANGE; + return -1; + } + + result->alias_name = first_unused; + + /* Terminate the line for any case. */ + cp = strpbrk (alias, "#\n"); + if (cp != NULL) + *cp = '\0'; + + first_unused += strlen (result->alias_name) + 1; + /* Adjust the pointer so it is aligned for + storing pointers. */ + first_unused += __alignof__ (char *) - 1; + first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *)); + result->alias_members = (char **) first_unused; + + line = alias; + + 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 *); + result->alias_members[result->alias_members_len] = line; + + while (*line != '\0' && *line != ',') + line++; + + if (line != result->alias_members[result->alias_members_len]) + { + *line = '\0'; + line++; + result->alias_members_len++; + } + } + return result->alias_members_len == 0 ? 0 : 1; +} + +enum nss_status +_nss_nis_setaliasent (void) +{ + __libc_lock_lock (lock); + + new_start = 1; + if (oldkey != NULL) + { + free (oldkey); + oldkey = NULL; + oldkeylen = 0; + } + + __libc_lock_unlock (lock); + + return NSS_STATUS_SUCCESS; +} +/* The 'endaliasent' function is identical. */ +strong_alias (_nss_nis_setaliasent, _nss_nis_endaliasent) + +static enum nss_status +internal_nis_getaliasent_r (struct aliasent *alias, char *buffer, + size_t buflen, int *errnop) +{ + char *domain; + + if (__glibc_unlikely (yp_get_default_domain (&domain))) + return NSS_STATUS_UNAVAIL; + + alias->alias_local = 0; + + /* Get the next entry until we found a correct one. */ + int parse_res; + do + { + char *result; + int len; + char *outkey; + int keylen; + int yperr; + + if (new_start) + yperr = yp_first (domain, "mail.aliases", &outkey, &keylen, &result, + &len); + else + yperr = yp_next (domain, "mail.aliases", oldkey, oldkeylen, &outkey, + &keylen, &result, &len); + + if (__glibc_unlikely (yperr != YPERR_SUCCESS)) + { + enum nss_status retval = yperr2nss (yperr); + + if (retval == NSS_STATUS_TRYAGAIN) + *errnop = errno; + return retval; + } + + if (__glibc_unlikely ((size_t) (len + 1) > buflen)) + { + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + char *p = strncpy (buffer, result, len); + buffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + parse_res = _nss_nis_parse_aliasent (outkey, p, alias, buffer, + buflen, errnop); + if (__glibc_unlikely (parse_res == -1)) + { + free (outkey); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + free (oldkey); + oldkey = outkey; + oldkeylen = keylen; + new_start = 0; + } + while (!parse_res); + + return NSS_STATUS_SUCCESS; +} + +enum nss_status +_nss_nis_getaliasent_r (struct aliasent *alias, char *buffer, size_t buflen, + int *errnop) +{ + enum nss_status status; + + __libc_lock_lock (lock); + + status = internal_nis_getaliasent_r (alias, buffer, buflen, errnop); + + __libc_lock_unlock (lock); + + return status; +} + +enum nss_status +_nss_nis_getaliasbyname_r (const char *name, struct aliasent *alias, + char *buffer, size_t buflen, int *errnop) +{ + if (name == NULL) + { + *errnop = EINVAL; + return NSS_STATUS_UNAVAIL; + } + + char *domain; + if (__glibc_unlikely (yp_get_default_domain (&domain))) + return NSS_STATUS_UNAVAIL; + + size_t namlen = strlen (name); + char *name2; + int use_alloca = __libc_use_alloca (namlen + 1); + if (use_alloca) + name2 = __alloca (namlen + 1); + else + { + name2 = malloc (namlen + 1); + if (name2 == NULL) + { + *errnop = ENOMEM; + return NSS_STATUS_TRYAGAIN; + } + } + + /* Convert name to lowercase. */ + size_t i; + for (i = 0; i < namlen; ++i) + name2[i] = _tolower (name[i]); + name2[i] = '\0'; + + char *result; + int len; + int yperr = yp_match (domain, "mail.aliases", name2, namlen, &result, &len); + + if (!use_alloca) + free (name2); + + if (__glibc_unlikely (yperr != YPERR_SUCCESS)) + { + enum nss_status retval = yperr2nss (yperr); + + if (retval == NSS_STATUS_TRYAGAIN) + *errnop = errno; + return retval; + } + + if (__glibc_unlikely ((size_t) (len + 1) > buflen)) + { + free (result); + *errnop = ERANGE; + return NSS_STATUS_TRYAGAIN; + } + + char *p = strncpy (buffer, result, len); + buffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + alias->alias_local = 0; + int parse_res = _nss_nis_parse_aliasent (name, p, alias, buffer, buflen, + errnop); + if (__glibc_unlikely (parse_res < 1)) + { + if (parse_res == -1) + return NSS_STATUS_TRYAGAIN; + else + return NSS_STATUS_NOTFOUND; + } + + return NSS_STATUS_SUCCESS; +} |