| File: | src/usr.sbin/relayd/carp.c |
| Warning: | line 64, 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 1.12 2016/08/18 00:45:52 jsg 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/queue.h> |
| 22 | #include <sys/ioctl.h> |
| 23 | |
| 24 | #include <net/if.h> |
| 25 | |
| 26 | #include <errno(*__errno()).h> |
| 27 | #include <string.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <unistd.h> |
| 30 | |
| 31 | #include "relayd.h" |
| 32 | |
| 33 | struct carpgroup { |
| 34 | TAILQ_ENTRY(carpgroup)struct { struct carpgroup *tqe_next; struct carpgroup **tqe_prev ; } entry; |
| 35 | char *group; |
| 36 | int do_demote; |
| 37 | int changed_by; |
| 38 | }; |
| 39 | |
| 40 | TAILQ_HEAD(carpgroups, carpgroup)struct carpgroups { struct carpgroup *tqh_first; struct carpgroup **tqh_last; } carpgroups = |
| 41 | TAILQ_HEAD_INITIALIZER(carpgroups){ ((void*)0), &(carpgroups).tqh_first }; |
| 42 | |
| 43 | struct carpgroup *carp_group_find(char *group); |
| 44 | int carp_demote_ioctl(char *, int); |
| 45 | |
| 46 | struct carpgroup * |
| 47 | carp_group_find(char *group) |
| 48 | { |
| 49 | struct carpgroup *c; |
| 50 | |
| 51 | TAILQ_FOREACH(c, &carpgroups, entry)for((c) = ((&carpgroups)->tqh_first); (c) != ((void*)0 ); (c) = ((c)->entry.tqe_next)) |
| 52 | if (!strcmp(c->group, group)) |
| 53 | return (c); |
| 54 | |
| 55 | return (NULL((void*)0)); |
| 56 | } |
| 57 | |
| 58 | int |
| 59 | carp_demote_init(char *group, int force) |
| 60 | { |
| 61 | struct carpgroup *c; |
| 62 | int level; |
| 63 | |
| 64 | 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' | |
| 65 | if ((c = calloc(1, sizeof(struct carpgroup))) == NULL((void*)0)) { |
| 66 | log_warn("%s: calloc", __func__); |
| 67 | return (-1); |
| 68 | } |
| 69 | if ((c->group = strdup(group)) == NULL((void*)0)) { |
| 70 | log_warn("%s: strdup", __func__); |
| 71 | free(c); |
| 72 | return (-1); |
| 73 | } |
| 74 | |
| 75 | /* only demote if this group already is demoted */ |
| 76 | if ((level = carp_demote_get(group)) == -1) { |
| 77 | free(c->group); |
| 78 | free(c); |
| 79 | return (-1); |
| 80 | } |
| 81 | if (level > 0 || force) |
| 82 | c->do_demote = 1; |
| 83 | |
| 84 | 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); |
| 85 | } |
| 86 | |
| 87 | return (0); |
| 88 | } |
| 89 | |
| 90 | void |
| 91 | carp_demote_shutdown(void) |
| 92 | { |
| 93 | struct carpgroup *c; |
| 94 | |
| 95 | while ((c = TAILQ_FIRST(&carpgroups)((&carpgroups)->tqh_first)) != NULL((void*)0)) { |
| 96 | 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); |
| 97 | if (c->do_demote && c->changed_by > 0) |
| 98 | carp_demote_ioctl(c->group, -c->changed_by); |
| 99 | |
| 100 | free(c->group); |
| 101 | free(c); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | int |
| 106 | carp_demote_get(char *group) |
| 107 | { |
| 108 | int s; |
| 109 | struct ifgroupreq ifgr; |
| 110 | |
| 111 | if ((s = socket(AF_INET2, SOCK_DGRAM2, 0)) == -1) { |
| 112 | log_warn("%s: socket", __func__); |
| 113 | return (-1); |
| 114 | } |
| 115 | |
| 116 | bzero(&ifgr, sizeof(ifgr)); |
| 117 | if (strlcpy(ifgr.ifgr_name, group, sizeof(ifgr.ifgr_name)) >= |
| 118 | sizeof(ifgr.ifgr_name)) { |
| 119 | log_warn("%s: invalid group", __func__); |
| 120 | close(s); |
| 121 | return (-1); |
| 122 | } |
| 123 | |
| 124 | if (ioctl(s, SIOCGIFGATTR(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifgroupreq) & 0x1fff) << 16) | ((('i')) << 8) | ((139))), (caddr_t)&ifgr) == -1) { |
| 125 | if (errno(*__errno()) == ENOENT2) |
| 126 | log_warnx("%s: group \"%s\" does not exist", |
| 127 | __func__, group); |
| 128 | else |
| 129 | log_warn("%s: ioctl", __func__); |
| 130 | close(s); |
| 131 | return (-1); |
| 132 | } |
| 133 | |
| 134 | close(s); |
| 135 | return ((int)ifgr.ifgr_attribifgr_ifgru.ifgru_attrib.ifg_carp_demoted); |
| 136 | } |
| 137 | |
| 138 | int |
| 139 | carp_demote_set(char *group, int demote) |
| 140 | { |
| 141 | struct carpgroup *c; |
| 142 | |
| 143 | if ((c = carp_group_find(group)) == NULL((void*)0)) { |
| 144 | log_warnx("%s: carp group %s not found", __func__, group); |
| 145 | return (-1); |
| 146 | } |
| 147 | |
| 148 | if (c->changed_by + demote < 0) { |
| 149 | log_warnx("%s: changed_by + demote < 0", __func__); |
| 150 | return (-1); |
| 151 | } |
| 152 | |
| 153 | if (c->do_demote && carp_demote_ioctl(group, demote) == -1) |
| 154 | return (-1); |
| 155 | |
| 156 | c->changed_by += demote; |
| 157 | |
| 158 | /* enable demotion when we return to 0, i. e. all sessions up */ |
| 159 | if (demote < 0 && c->changed_by == 0) |
| 160 | c->do_demote = 1; |
| 161 | |
| 162 | return (0); |
| 163 | } |
| 164 | |
| 165 | int |
| 166 | carp_demote_reset(char *group, int value) |
| 167 | { |
| 168 | int level; |
| 169 | int demote = 0; |
| 170 | |
| 171 | if (value < 0) { |
| 172 | log_warnx("%s: value < 0", __func__); |
| 173 | return (-1); |
| 174 | } |
| 175 | |
| 176 | if ((level = carp_demote_get(group)) == -1) |
| 177 | return (-1); |
| 178 | if (level == value) |
| 179 | return (0); |
| 180 | |
| 181 | demote -= level; |
| 182 | demote += value; |
| 183 | |
| 184 | if (carp_demote_ioctl(group, demote) == -1) |
| 185 | return (-1); |
| 186 | |
| 187 | return (0); |
| 188 | } |
| 189 | |
| 190 | int |
| 191 | carp_demote_ioctl(char *group, int demote) |
| 192 | { |
| 193 | int s, res; |
| 194 | struct ifgroupreq ifgr; |
| 195 | |
| 196 | if ((s = socket(AF_INET2, SOCK_DGRAM2, 0)) == -1) { |
| 197 | log_warn("%s: socket", __func__); |
| 198 | return (-1); |
| 199 | } |
| 200 | |
| 201 | bzero(&ifgr, sizeof(ifgr)); |
| 202 | if (strlcpy(ifgr.ifgr_name, group, sizeof(ifgr.ifgr_name)) >= |
| 203 | sizeof(ifgr.ifgr_name)) { |
| 204 | log_warn("%s: invalid group", __func__); |
| 205 | close(s); |
| 206 | return (-1); |
| 207 | } |
| 208 | ifgr.ifgr_attribifgr_ifgru.ifgru_attrib.ifg_carp_demoted = demote; |
| 209 | |
| 210 | if ((res = ioctl(s, SIOCSIFGATTR((unsigned long)0x80000000 | ((sizeof(struct ifgroupreq) & 0x1fff) << 16) | ((('i')) << 8) | ((140))), (caddr_t)&ifgr)) == -1) |
| 211 | log_warn("%s: unable to %s the demote state " |
| 212 | "of group '%s'", __func__, |
| 213 | (demote > 0) ? "increment" : "decrement", group); |
| 214 | else |
| 215 | log_info("%s the demote state of group '%s'", |
| 216 | (demote > 0) ? "incremented" : "decremented", group); |
| 217 | |
| 218 | close(s); |
| 219 | return (res); |
| 220 | } |