| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 |
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| 4 | Winbind daemon connection manager
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| 5 |
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| 6 | Copyright (C) Tim Potter 2001
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| 7 | Copyright (C) Andrew Bartlett 2002
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| 8 | Copyright (C) Gerald (Jerry) Carter 2003
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| 9 | Copyright (C) Marc VanHeyningen 2008
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| 10 |
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| 11 | This program is free software; you can redistribute it and/or modify
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| 12 | it under the terms of the GNU General Public License as published by
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| 13 | the Free Software Foundation; either version 3 of the License, or
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| 14 | (at your option) any later version.
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| 15 |
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| 16 | This program is distributed in the hope that it will be useful,
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| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | GNU General Public License for more details.
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| 20 |
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| 21 | You should have received a copy of the GNU General Public License
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| 22 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 23 | */
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| 24 |
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| 25 |
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| 26 | #include "includes.h"
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| 27 |
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| 28 | /**
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| 29 | * @file
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| 30 | * Negative connection cache implemented in terms of gencache API
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| 31 | *
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| 32 | * The negative connection cache stores names of servers which have
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| 33 | * been unresponsive so that we don't waste time repeatedly trying
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| 34 | * to contact them. It used to use an in-memory linked list, but
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| 35 | * this limited its utility to a single process
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| 36 | */
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| 37 |
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| 38 |
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| 39 | /**
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| 40 | * prefix used for all entries put into the general cache
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| 41 | */
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| 42 | static const char NEGATIVE_CONN_CACHE_PREFIX[] = "NEG_CONN_CACHE";
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| 43 |
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| 44 | /**
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| 45 | * Marshalls the domain and server name into the key for the gencache
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| 46 | * record
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| 47 | *
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| 48 | * @param[in] domain required
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| 49 | * @param[in] server may be a FQDN or an IP address
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| 50 | * @return the resulting string, which the caller is responsible for
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| 51 | * SAFE_FREE()ing
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| 52 | * @retval NULL returned on error
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| 53 | */
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| 54 | static char *negative_conn_cache_keystr(const char *domain, const char *server)
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| 55 | {
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| 56 | const char NEGATIVE_CONN_CACHE_KEY_FMT[] = "%s/%s,%s";
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| 57 | char *keystr = NULL;
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| 58 |
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| 59 | SMB_ASSERT(domain != NULL);
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| 60 | if (server == NULL)
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| 61 | server = "";
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| 62 |
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| 63 | keystr = talloc_asprintf(talloc_tos(),NEGATIVE_CONN_CACHE_KEY_FMT,
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| 64 | NEGATIVE_CONN_CACHE_PREFIX, domain, server);
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| 65 | if (keystr == NULL) {
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| 66 | DEBUG(0, ("negative_conn_cache_keystr: malloc error\n"));
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| 67 | }
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| 68 |
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| 69 | return keystr;
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| 70 | }
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| 71 |
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| 72 | /**
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| 73 | * Marshalls the NT status into a printable value field for the gencache
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| 74 | * record
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| 75 | *
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| 76 | * @param[in] status
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| 77 | * @return the resulting string, which the caller is responsible for
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| 78 | * SAFE_FREE()ing
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| 79 | * @retval NULL returned on error
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| 80 | */
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| 81 | static char *negative_conn_cache_valuestr(NTSTATUS status)
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| 82 | {
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| 83 | char *valuestr = NULL;
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| 84 |
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| 85 | valuestr = talloc_asprintf(talloc_tos(), "%x", NT_STATUS_V(status));
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| 86 | if (valuestr == NULL) {
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| 87 | DEBUG(0, ("negative_conn_cache_valuestr: malloc error\n"));
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| 88 | }
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| 89 |
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