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Diffstat (limited to 'source4/lib/wins_srv.c')
| -rw-r--r-- | source4/lib/wins_srv.c | 362 |
1 files changed, 0 insertions, 362 deletions
diff --git a/source4/lib/wins_srv.c b/source4/lib/wins_srv.c deleted file mode 100644 index 0338db8b3d..0000000000 --- a/source4/lib/wins_srv.c +++ /dev/null @@ -1,362 +0,0 @@ -/* - Unix SMB/CIFS implementation. - Samba wins server helper functions - Copyright (C) Andrew Tridgell 1992-2002 - Copyright (C) Christopher R. Hertel 2000 - Copyright (C) Tim Potter 2003 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program 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 General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#include "includes.h" -#include "system/time.h" - -/* - This is pretty much a complete rewrite of the earlier code. The main - aim of the rewrite is to add support for having multiple wins server - lists, so Samba can register with multiple groups of wins servers - and each group has a failover list of wins servers. - - Central to the way it all works is the idea of a wins server - 'tag'. A wins tag is a label for a group of wins servers. For - example if you use - - wins server = fred:192.168.2.10 mary:192.168.3.199 fred:192.168.2.61 - - then you would have two groups of wins servers, one tagged with the - name 'fred' and the other with the name 'mary'. I would usually - recommend using interface names instead of 'fred' and 'mary' but - they can be any alpha string. - - Now, how does it all work. Well, nmbd needs to register each of its - IPs with each of its names once with each group of wins servers. So - it tries registering with the first one mentioned in the list, then - if that fails it marks that WINS server dead and moves onto the next - one. - - In the client code things are a bit different. As each of the groups - of wins servers is a separate name space we need to try each of the - groups until we either succeed or we run out of wins servers to - try. If we get a negative response from a wins server then that - means the name doesn't exist in that group, so we give up on that - group and move to the next group. If we don't get a response at all - then maybe the wins server is down, in which case we need to - failover to the next one for that group. - - confused yet? (tridge) -*/ - -/* how long a server is marked dead for */ -#define DEATH_TIME 600 - -/* The list of dead wins servers is stored in gencache.tdb. Each server is - marked dead from the point of view of a given source address. We keep a - separate dead list for each src address to cope with multiple interfaces - that are not routable to each other. - */ - -#define WINS_SRV_FMT "WINS_SRV_DEAD/%s,%s" /* wins_ip,src_ip */ - -static char *wins_srv_keystr(struct ipv4_addr wins_ip, struct ipv4_addr src_ip) -{ - char *keystr; - - if (asprintf(&keystr, WINS_SRV_FMT, sys_inet_ntoa(wins_ip), - sys_inet_ntoa(src_ip)) == -1) { - DEBUG(0, ("wins_srv_is_dead: malloc error\n")); - return NULL; - } - - return keystr; -} - -/* - see if an ip is on the dead list -*/ - -BOOL wins_srv_is_dead(struct ipv4_addr wins_ip, struct ipv4_addr src_ip) -{ - char *keystr = wins_srv_keystr(wins_ip, src_ip); - BOOL result; - - /* If the key exists then the WINS server has been marked as dead */ - - result = gencache_get(keystr, NULL, NULL); - SAFE_FREE(keystr); - - DEBUG(4, ("wins_srv_is_dead: %s is %s\n", sys_inet_ntoa(wins_ip), - result ? "dead" : "alive")); - - return result; -} - - -/* - mark a wins server as being alive (for the moment) -*/ -void wins_srv_alive(struct ipv4_addr wins_ip, struct ipv4_addr src_ip) -{ - char *keystr = wins_srv_keystr(wins_ip, src_ip); - - gencache_del(keystr); - SAFE_FREE(keystr); - - DEBUG(4, ("wins_srv_alive: marking wins server %s alive\n", - sys_inet_ntoa(wins_ip))); -} - -/* - mark a wins server as temporarily dead -*/ -void wins_srv_died(struct ipv4_addr wins_ip, struct ipv4_addr src_ip) -{ - char *keystr; - - if (is_zero_ip(wins_ip) || wins_srv_is_dead(wins_ip, src_ip)) - return; - - keystr = wins_srv_keystr(wins_ip, src_ip); - - gencache_set(keystr, "DOWN", time(NULL) + DEATH_TIME); - - SAFE_FREE(keystr); - - DEBUG(4,("Marking wins server %s dead for %u seconds from source %s\n", - sys_inet_ntoa(wins_ip), DEATH_TIME, sys_inet_ntoa(src_ip))); -} - -/* - return the total number of wins servers, dead or not -*/ -uint_t wins_srv_count(void) -{ - const char **list; - int count = 0; - - if (lp_wins_support()) { - /* simple - just talk to ourselves */ - return 1; - } - - list = lp_wins_server_list(); - for (count=0; list && list[count]; count++) - /* nop */ ; - - return count; -} - -/* an internal convenience structure for an IP with a short string tag - attached */ -struct tagged_ip { - fstring tag; - struct ipv4_addr ip; -}; - -/* - parse an IP string that might be in tagged format - the result is a tagged_ip structure containing the tag - and the ip in in_addr format. If there is no tag then - use the tag '*' -*/ -static void parse_ip(TALLOC_CTX *mem_ctx, struct tagged_ip *ip, const char *str) -{ - char *s = strchr(str, ':'); - if (!s) { - fstrcpy(ip->tag, "*"); - ip->ip = interpret_addr2(str); - return; - } - - ip->ip = interpret_addr2(s+1); - fstrcpy(ip->tag, str); - s = strchr(ip->tag, ':'); - if (s) *s = 0; -} - - - -/* - return the list of wins server tags. A 'tag' is used to distinguish - wins server as either belonging to the same name space or a separate - name space. Usually you would setup your 'wins server' option to - list one or more wins server per interface and use the interface - name as your tag, but you are free to use any tag you like. -*/ -char **wins_srv_tags(void) -{ - char **ret = NULL; - int count=0, i, j; - const char **list; - TALLOC_CTX *mem_ctx; - - if (lp_wins_support()) { - /* give the caller something to chew on. This makes - the rest of the logic simpler (ie. less special cases) */ - ret = malloc_array_p(char *, 2); - if (!ret) return NULL; - ret[0] = strdup("*"); - ret[1] = NULL; - return ret; - } - - list = lp_wins_server_list(); - if (!list) - return NULL; - - mem_ctx = talloc_init("wins_ssrv_tags"); - if (!mem_ctx) { - return NULL; - } - /* yes, this is O(n^2) but n is very small */ - for (i=0;list[i];i++) { - struct tagged_ip t_ip; - - parse_ip(mem_ctx, &t_ip, list[i]); - - /* see if we already have it */ - for (j=0;j<count;j++) { - if (strcmp(ret[j], t_ip.tag) == 0) { - break; - } - } - - if (j != count) { - /* we already have it. Move along */ - continue; - } - - /* add it to the list */ - ret = realloc_p(ret, char *, count+2); - ret[count] = strdup(t_ip.tag); - if (!ret[count]) break; - count++; - } - - if (count) { - /* make sure we null terminate */ - ret[count] = NULL; - } - - return ret; -} - -/* free a list of wins server tags given by wins_srv_tags */ -void wins_srv_tags_free(char **list) -{ - int i; - if (!list) return; - for (i=0; list[i]; i++) { - free(list[i]); - } - free(list); -} - - -/* - return the IP of the currently active wins server for the given tag, - or the zero IP otherwise -*/ -struct ipv4_addr wins_srv_ip_tag(const char *tag, struct ipv4_addr src_ip) -{ - const char **list; - int i; - struct tagged_ip t_ip; - TALLOC_CTX *mem_ctx; - - /* if we are a wins server then we always just talk to ourselves */ - if (lp_wins_support()) { - extern struct ipv4_addr loopback_ip; - return loopback_ip; - } - - list = lp_wins_server_list(); - if (!list || !list[0]) { - struct ipv4_addr ip; - zero_ip(&ip); - return ip; - } - - mem_ctx = talloc_init("wins_srv_ip_tag"); - /* find the first live one for this tag */ - for (i=0; list[i]; i++) { - parse_ip(mem_ctx, &t_ip, list[i]); - if (strcmp(tag, t_ip.tag) != 0) { - /* not for the right tag. Move along */ - continue; - } - if (!wins_srv_is_dead(t_ip.ip, src_ip)) { - char *src_name; - src_name = talloc_strdup(mem_ctx, sys_inet_ntoa(src_ip)); - DEBUG(6,("Current wins server for tag '%s' with source %s is %s\n", - tag, - src_name, - sys_inet_ntoa(t_ip.ip))); - goto exit; - } - } - - /* they're all dead - try the first one until they revive */ - for (i=0; list[i]; i++) { - parse_ip(mem_ctx, &t_ip, list[i]); - if (strcmp(tag, t_ip.tag) != 0) { - continue; - } - goto exit; - } - - /* this can't happen?? */ - zero_ip(&t_ip.ip); -exit: - talloc_destroy(mem_ctx); - return t_ip.ip; -} - - -/* - return a count of the number of IPs for a particular tag, including - dead ones -*/ -uint_t wins_srv_count_tag(const char *tag) -{ - const char **list; - int i, count=0; - TALLOC_CTX *mem_ctx; - - /* if we are a wins server then we always just talk to ourselves */ - if (lp_wins_support()) { - return 1; - } - - list = lp_wins_server_list(); - if (!list || !list[0]) { - return 0; - } - - /* find the first live one for this tag */ - mem_ctx = talloc_init("wins_srv_count_tag"); - if (!mem_ctx) { - return 0; - } - for (i=0; list[i]; i++) { - struct tagged_ip t_ip; - parse_ip(mem_ctx, &t_ip, list[i]); - if (strcmp(tag, t_ip.tag) == 0) { - count++; - } - } - talloc_destroy(mem_ctx); - - return count; -} |