ctdb/common/system_util.c

   1 /*
   2    common system utilities
   3
   4    Copyright (C) Amitay Isaacs  2014
   5    Copyright (C) Martin Schwenke  2014
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "replace.h"
  22 #include "system/filesys.h"
  23 #include "system/shmem.h"
  24 #include "system/network.h"
  25
  26 #include <talloc.h>
  27 #include <libgen.h>
  28
  29 #include "lib/util/debug.h"
  30
  31 #include "protocol/protocol.h"
  32
  33 #include "common/logging.h"
  34 #include "common/system.h"
  35
  36 #if HAVE_SCHED_H
  37 #include <sched.h>
  38 #endif
  39
  40 #if HAVE_PROCINFO_H
  41 #include <procinfo.h>
  42 #endif
  43
  44 #include "lib/util/mkdir_p.h"
  45
  46 /*
  47   if possible, make this task real time
  48  */
  49 bool set_scheduler(void)
  50 {
  51 #ifdef _AIX_
  52 #if HAVE_THREAD_SETSCHED
  53         struct thrdentry64 te;
  54         tid64_t ti;
  55
  56         ti = 0ULL;
  57         if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
  58                 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
  59                 return false;
  60         }
  61
  62         if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
  63                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
  64                                   strerror(errno)));
  65                 return false;
  66         } else {
  67                 return true;
  68         }
  69 #endif
  70 #else /* no AIX */
  71 #if HAVE_SCHED_SETSCHEDULER
  72         struct sched_param p;
  73
  74         p.sched_priority = 1;
  75
  76         if (sched_setscheduler(0, SCHED_FIFO, &p) == -1) {
  77                 DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n",
  78                          strerror(errno)));
  79                 return false;
  80         } else {
  81                 return true;
  82         }
  83 #endif
  84 #endif
  85         DEBUG(DEBUG_CRIT,("No way to set real-time priority.\n"));
  86         return false;
  87 }
  88
  89 /*
  90   reset scheduler from real-time to normal scheduling
  91  */
  92 void reset_scheduler(void)
  93 {
  94 #ifdef _AIX_
  95 #if HAVE_THREAD_SETSCHED
  96         struct thrdentry64 te;
  97         tid64_t ti;
  98
  99         ti = 0ULL;
 100         if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
 101                 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
 102         }
 103         if (thread_setsched(te.ti_tid, 0, SCHED_OTHER) == -1) {
 104                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
 105         }
 106 #endif
 107 #else /* no AIX */
 108 #if HAVE_SCHED_SETSCHEDULER
 109         struct sched_param p;
 110
 111         p.sched_priority = 0;
 112         if (sched_setscheduler(0, SCHED_OTHER, &p) == -1) {
 113                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
 114         }
 115 #endif
 116 #endif
 117 }
 118
 119 static bool parse_ipv4(const char *s, unsigned port, struct sockaddr_in *sin)
 120 {
 121         sin->sin_family = AF_INET;
 122         sin->sin_port   = htons(port);
 123
 124         if (inet_pton(AF_INET, s, &sin->sin_addr) != 1) {
 125                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin_addr\n", s));
 126                 return false;
 127         }
 128
 129 #ifdef HAVE_SOCK_SIN_LEN
 130         sin->sin_len = sizeof(*sin);
 131 #endif
 132         return true;
 133 }
 134
 135 static bool parse_ipv6(const char *s, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
 136 {
 137         saddr->ip6.sin6_family   = AF_INET6;
 138         saddr->ip6.sin6_port     = htons(port);
 139         saddr->ip6.sin6_flowinfo = 0;
 140         saddr->ip6.sin6_scope_id = 0;
 141
 142         if (inet_pton(AF_INET6, s, &saddr->ip6.sin6_addr) != 1) {
 143                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin6_addr\n", s));
 144                 return false;
 145         }
 146
 147         if (ifaces && IN6_IS_ADDR_LINKLOCAL(&saddr->ip6.sin6_addr)) {
 148                 if (strchr(ifaces, ',')) {
 149                         DEBUG(DEBUG_ERR, (__location__ " Link local address %s "
 150                                           "is specified for multiple ifaces %s\n",
 151                                           s, ifaces));
 152                         return false;
 153                 }
 154                 saddr->ip6.sin6_scope_id = if_nametoindex(ifaces);
 155         }
 156
 157 #ifdef HAVE_SOCK_SIN_LEN
 158         saddr->ip6.sin6_len = sizeof(*saddr);
 159 #endif
 160         return true;
 161 }
 162
 163 /*
 164   parse an ip
 165  */
 166 static bool parse_ip(const char *addr, const char *ifaces, unsigned port,
 167                      ctdb_sock_addr *saddr)
 168 {
 169         char *p;
 170         bool ret;
 171
 172         ZERO_STRUCTP(saddr); /* valgrind :-) */
 173
 174         /* IPv4 or IPv6 address?
 175          *
 176          * Use rindex() because we need the right-most ':' below for
 177          * IPv4-mapped IPv6 addresses anyway...
 178          */
 179         p = rindex(addr, ':');
 180         if (p == NULL) {
 181                 ret = parse_ipv4(addr, port, &saddr->ip);
 182         } else {
 183                 uint8_t ipv4_mapped_prefix[12] = {
 184                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff
 185                 };
 186
 187                 ret = parse_ipv6(addr, ifaces, port, saddr);
 188                 if (! ret) {
 189                         return ret;
 190                 }
 191
 192                 /*
 193                  * Check for IPv4-mapped IPv6 address
 194                  * (e.g. ::ffff:192.0.2.128) - reparse as IPv4 if
 195                  * necessary
 196                  */
 197                 if (memcmp(&saddr->ip6.sin6_addr.s6_addr[0],
 198                            ipv4_mapped_prefix,
 199                            sizeof(ipv4_mapped_prefix)) == 0) {
 200                         /* Reparse as IPv4 */
 201                         ret = parse_ipv4(p+1, port, &saddr->ip);
 202                 }
 203         }
 204
 205         return ret;
 206 }
 207
 208 /*
 209   parse a ip/mask pair
 210  */
 211 bool parse_ip_mask(const char *str, const char *ifaces, ctdb_sock_addr *addr, unsigned *mask)
 212 {
 213         char *p;
 214         char s[64]; /* Much longer than INET6_ADDRSTRLEN */
 215         char *endp = NULL;
 216         ssize_t len;
 217         bool ret;
 218
 219         ZERO_STRUCT(*addr);
 220
 221         len = strlen(str);
 222         if (len >= sizeof(s)) {
 223                 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", str));
 224                 return false;
 225         }
 226
 227         strncpy(s, str, len+1);
 228
 229         p = rindex(s, '/');
 230         if (p == NULL) {
 231                 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
 232                 return false;
 233         }
 234
 235         *mask = strtoul(p+1, &endp, 10);
 236         if (endp == NULL || *endp != 0) {
 237                 /* trailing garbage */
 238                 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the mask in %s\n", s));
 239                 return false;
 240         }
 241         *p = 0;
 242
 243
 244         /* now is this a ipv4 or ipv6 address ?*/
 245         ret = parse_ip(s, ifaces, 0, addr);
 246
 247         return ret;
 248 }
 249
 250 /* we don't lock future pages here; it would increase the chance that
 251  * we'd fail to mmap later on. */
 252 void lockdown_memory(bool valgrinding)
 253 {
 254 #if defined(HAVE_MLOCKALL) && !defined(_AIX_)
 255         /* Extra stack, please! */
 256         char dummy[10000];
 257         memset(dummy, 0, sizeof(dummy));
 258
 259         if (valgrinding) {
 260                 return;
 261         }
 262
 263         /* Ignore when running in local daemons mode */
 264         if (getuid() != 0) {
 265                 return;
 266         }
 267
 268         /* Avoid compiler optimizing out dummy. */
 269         mlock(dummy, sizeof(dummy));
 270         if (mlockall(MCL_CURRENT) != 0) {
 271                 DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n",
 272                                      strerror(errno)));
 273         }
 274 #endif
 275 }
 276
 277 void mkdir_p_or_die(const char *dir, int mode)
 278 {
 279         int ret;
 280
 281         ret = mkdir_p(dir, mode);
 282         if (ret != 0) {
 283                 DEBUG(DEBUG_ALERT,
 284                       ("ctdb exiting with error: "
 285                        "failed to create directory \"%s\" (%s)\n",
 286                        dir, strerror(errno)));
 287                 exit(1);
 288         }
 289 }
 290
 291 void ctdb_wait_for_process_to_exit(pid_t pid)
 292 {
 293         while (kill(pid, 0) == 0 || errno != ESRCH) {
 294                 sleep(5);
 295         }
 296 }