File: | src/usr.sbin/ripd/carp.c |
Warning: | line 63, column 7 Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' |
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1 | /* $OpenBSD: carp.c,v 1.3 2009/09/30 12:22:03 claudio Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2006 Henning Brauer <henning@openbsd.org> |
5 | * |
6 | * Permission to use, copy, modify, and distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above |
8 | * copyright notice and this permission notice appear in all copies. |
9 | * |
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | */ |
18 | |
19 | #include <sys/types.h> |
20 | #include <sys/socket.h> |
21 | #include <sys/ioctl.h> |
22 | #include <net/if.h> |
23 | |
24 | #include <errno(*__errno()).h> |
25 | #include <string.h> |
26 | #include <stdlib.h> |
27 | #include <unistd.h> |
28 | |
29 | #include "ripd.h" |
30 | #include "log.h" |
31 | |
32 | struct carpgroup { |
33 | TAILQ_ENTRY(carpgroup)struct { struct carpgroup *tqe_next; struct carpgroup **tqe_prev ; } entry; |
34 | char *group; |
35 | int do_demote; |
36 | int changed_by; |
37 | }; |
38 | |
39 | TAILQ_HEAD(carpgroups, carpgroup)struct carpgroups { struct carpgroup *tqh_first; struct carpgroup **tqh_last; } carpgroups = |
40 | TAILQ_HEAD_INITIALIZER(carpgroups){ ((void *)0), &(carpgroups).tqh_first }; |
41 | |
42 | struct carpgroup *carp_group_find(char *group); |
43 | int carp_demote_ioctl(char *, int); |
44 | |
45 | struct carpgroup * |
46 | carp_group_find(char *group) |
47 | { |
48 | struct carpgroup *c; |
49 | |
50 | TAILQ_FOREACH(c, &carpgroups, entry)for((c) = ((&carpgroups)->tqh_first); (c) != ((void *) 0); (c) = ((c)->entry.tqe_next)) |
51 | if (!strcmp(c->group, group)) |
52 | return (c); |
53 | |
54 | return (NULL((void *)0)); |
55 | } |
56 | |
57 | int |
58 | carp_demote_init(char *group, int force) |
59 | { |
60 | struct carpgroup *c; |
61 | int level; |
62 | |
63 | if ((c = carp_group_find(group)) == NULL((void *)0)) { |
Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' | |
64 | if ((c = calloc(1, sizeof(struct carpgroup))) == NULL((void *)0)) { |
65 | log_warn("carp_demote_init calloc"); |
66 | return (-1); |
67 | } |
68 | if ((c->group = strdup(group)) == NULL((void *)0)) { |
69 | log_warn("carp_demote_init strdup"); |
70 | free(c); |
71 | return (-1); |
72 | } |
73 | |
74 | /* only demote if this group already is demoted */ |
75 | if ((level = carp_demote_get(group)) == -1) { |
76 | free(c->group); |
77 | free(c); |
78 | return (-1); |
79 | } |
80 | if (level > 0 || force) |
81 | c->do_demote = 1; |
82 | |
83 | TAILQ_INSERT_TAIL(&carpgroups, c, entry)do { (c)->entry.tqe_next = ((void *)0); (c)->entry.tqe_prev = (&carpgroups)->tqh_last; *(&carpgroups)->tqh_last = (c); (&carpgroups)->tqh_last = &(c)->entry.tqe_next ; } while (0); |
84 | } |
85 | |
86 | return (0); |
87 | } |
88 | |
89 | void |
90 | carp_demote_shutdown(void) |
91 | { |
92 | struct carpgroup *c; |
93 | |
94 | while ((c = TAILQ_FIRST(&carpgroups)((&carpgroups)->tqh_first)) != NULL((void *)0)) { |
95 | TAILQ_REMOVE(&carpgroups, c, entry)do { if (((c)->entry.tqe_next) != ((void *)0)) (c)->entry .tqe_next->entry.tqe_prev = (c)->entry.tqe_prev; else ( &carpgroups)->tqh_last = (c)->entry.tqe_prev; *(c)-> entry.tqe_prev = (c)->entry.tqe_next; ; ; } while (0); |
96 | if (c->do_demote && c->changed_by > 0) |
97 | carp_demote_ioctl(c->group, -c->changed_by); |
98 | |
99 | free(c->group); |
100 | free(c); |
101 | } |
102 | } |
103 | |
104 | int |
105 | carp_demote_get(char *group) |
106 | { |
107 | int s; |
108 | struct ifgroupreq ifgr; |
109 | |
110 | if ((s = socket(AF_INET2, SOCK_DGRAM2, 0)) == -1) { |
111 | log_warn("carp_demote_get: socket"); |
112 | return (-1); |
113 | } |
114 | |
115 | bzero(&ifgr, sizeof(ifgr)); |
116 | strlcpy(ifgr.ifgr_name, group, sizeof(ifgr.ifgr_name)); |
117 | |
118 | if (ioctl(s, SIOCGIFGATTR(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifgroupreq) & 0x1fff) << 16) | ((('i')) << 8) | ((139))), (caddr_t)&ifgr) == -1) { |
119 | if (errno(*__errno()) == ENOENT2) |
120 | log_warnx("group \"%s\" does not exist", group); |
121 | else |
122 | log_warn("carp_demote_get: ioctl"); |
123 | close(s); |
124 | return (-1); |
125 | } |
126 | |
127 | close(s); |
128 | return ((int)ifgr.ifgr_attribifgr_ifgru.ifgru_attrib.ifg_carp_demoted); |
129 | } |
130 | |
131 | int |
132 | carp_demote_set(char *group, int demote) |
133 | { |
134 | struct carpgroup *c; |
135 | |
136 | if ((c = carp_group_find(group)) == NULL((void *)0)) { |
137 | log_warnx("carp_group_find for %s returned NULL?!", group); |
138 | return (-1); |
139 | } |
140 | |
141 | if (c->changed_by + demote < 0) { |
142 | log_warnx("carp_demote_set: changed_by + demote < 0"); |
143 | return (-1); |
144 | } |
145 | |
146 | if (c->do_demote && carp_demote_ioctl(group, demote) == -1) |
147 | return (-1); |
148 | |
149 | c->changed_by += demote; |
150 | |
151 | /* enable demotion when we return to 0, i. e. all sessions up */ |
152 | if (demote < 0 && c->changed_by == 0) |
153 | c->do_demote = 1; |
154 | |
155 | return (0); |
156 | } |
157 | |
158 | int |
159 | carp_demote_ioctl(char *group, int demote) |
160 | { |
161 | int s, res; |
162 | struct ifgroupreq ifgr; |
163 | |
164 | if ((s = socket(AF_INET2, SOCK_DGRAM2, 0)) == -1) { |
165 | log_warn("carp_demote_get: socket"); |
166 | return (-1); |
167 | } |
168 | |
169 | bzero(&ifgr, sizeof(ifgr)); |
170 | strlcpy(ifgr.ifgr_name, group, sizeof(ifgr.ifgr_name)); |
171 | ifgr.ifgr_attribifgr_ifgru.ifgru_attrib.ifg_carp_demoted = demote; |
172 | |
173 | if ((res = ioctl(s, SIOCSIFGATTR((unsigned long)0x80000000 | ((sizeof(struct ifgroupreq) & 0x1fff) << 16) | ((('i')) << 8) | ((140))), (caddr_t)&ifgr)) == -1) |
174 | log_warn("unable to %s the demote state " |
175 | "of group '%s'", (demote > 0) ? "increment" : "decrement", |
176 | group); |
177 | else |
178 | log_info("%s the demote state of group '%s'", |
179 | (demote > 0) ? "incremented" : "decremented", group); |
180 | |
181 | close(s); |
182 | return (res); |
183 | } |