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 "includes.h"
  22 #include "system/filesys.h"
  23 #include "system/shmem.h"
  24
  25 #include <libgen.h>
  26
  27
  28 #if HAVE_SCHED_H
  29 #include <sched.h>
  30 #endif
  31
  32 #if HAVE_PROCINFO_H
  33 #include <procinfo.h>
  34 #endif
  35
  36 /*
  37   if possible, make this task real time
  38  */
  39 void set_scheduler(void)
  40 {
  41 #ifdef _AIX_
  42 #if HAVE_THREAD_SETSCHED
  43         struct thrdentry64 te;
  44         tid64_t ti;
  45
  46         ti = 0ULL;
  47         if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
  48                 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
  49                 return;
  50         }
  51
  52         if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
  53                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
  54                                   strerror(errno)));
  55         } else {
  56                 DEBUG(DEBUG_NOTICE, ("Set scheduler to SCHED_RR\n"));
  57         }
  58 #endif
  59 #else /* no AIX */
  60 #if HAVE_SCHED_SETSCHEDULER
  61         struct sched_param p;
  62
  63         p.sched_priority = 1;
  64
  65         if (sched_setscheduler(0, SCHED_FIFO, &p) == -1) {
  66                 DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n",
  67                          strerror(errno)));
  68         } else {
  69                 DEBUG(DEBUG_NOTICE,("Set scheduler to SCHED_FIFO\n"));
  70         }
  71 #endif
  72 #endif
  73 }
  74
  75 /*
  76   reset scheduler from real-time to normal scheduling
  77  */
  78 void reset_scheduler(void)
  79 {
  80 #ifdef _AIX_
  81 #if HAVE_THREAD_SETSCHED
  82         struct thrdentry64 te;
  83         tid64_t ti;
  84
  85         ti = 0ULL;
  86         if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
  87                 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
  88         }
  89         if (thread_setsched(te.ti_tid, 0, SCHED_OTHER) == -1) {
  90                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
  91         }
  92 #endif
  93 #else /* no AIX */
  94 #if HAVE_SCHED_SETSCHEDULER
  95         struct sched_param p;
  96
  97         p.sched_priority = 0;
  98         if (sched_setscheduler(0, SCHED_OTHER, &p) == -1) {
  99                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
 100         }
 101 #endif
 102 #endif
 103 }
 104
 105 void set_nonblocking(int fd)
 106 {
 107         int v;
 108
 109         v = fcntl(fd, F_GETFL, 0);
 110         if (v == -1) {
 111                 DEBUG(DEBUG_WARNING, ("Failed to get file status flags - %s\n",
 112                                       strerror(errno)));
 113                 return;
 114         }
 115         if (fcntl(fd, F_SETFL, v | O_NONBLOCK) == -1) {
 116                 DEBUG(DEBUG_WARNING, ("Failed to set non_blocking on fd - %s\n",
 117                                       strerror(errno)));
 118         }
 119 }
 120
 121 void set_close_on_exec(int fd)
 122 {
 123         int v;
 124
 125         v = fcntl(fd, F_GETFD, 0);
 126         if (v == -1) {
 127                 DEBUG(DEBUG_WARNING, ("Failed to get file descriptor flags - %s\n",
 128                                       strerror(errno)));
 129                 return;
 130         }
 131         if (fcntl(fd, F_SETFD, v | FD_CLOEXEC) != 0) {
 132                 DEBUG(DEBUG_WARNING, ("Failed to set close_on_exec on fd - %s\n",
 133                                       strerror(errno)));
 134         }
 135 }
 136
 137
 138 bool parse_ipv4(const char *s, unsigned port, struct sockaddr_in *sin)
 139 {
 140         sin->sin_family = AF_INET;
 141         sin->sin_port   = htons(port);
 142
 143         if (inet_pton(AF_INET, s, &sin->sin_addr) != 1) {
 144                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin_addr\n", s));
 145                 return false;
 146         }
 147
 148         return true;
 149 }
 150
 151 static bool parse_ipv6(const char *s, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
 152 {
 153         saddr->ip6.sin6_family   = AF_INET6;
 154         saddr->ip6.sin6_port     = htons(port);
 155         saddr->ip6.sin6_flowinfo = 0;
 156         saddr->ip6.sin6_scope_id = 0;
 157
 158         if (inet_pton(AF_INET6, s, &saddr->ip6.sin6_addr) != 1) {
 159                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin6_addr\n", s));
 160                 return false;
 161         }
 162
 163         if (ifaces && IN6_IS_ADDR_LINKLOCAL(&saddr->ip6.sin6_addr)) {
 164                 if (strchr(ifaces, ',')) {
 165                         DEBUG(DEBUG_ERR, (__location__ " Link local address %s "
 166                                           "is specified for multiple ifaces %s\n",
 167                                           s, ifaces));
 168                         return false;
 169                 }
 170                 saddr->ip6.sin6_scope_id = if_nametoindex(ifaces);
 171         }
 172
 173         return true;
 174 }
 175
 176 /*
 177   parse an ip
 178  */
 179 bool parse_ip(const char *addr, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
 180 {
 181         char *p;
 182         bool ret;
 183
 184         ZERO_STRUCTP(saddr); /* valgrind :-) */
 185
 186         /* now is this a ipv4 or ipv6 address ?*/
 187         p = index(addr, ':');
 188         if (p == NULL) {
 189                 ret = parse_ipv4(addr, port, &saddr->ip);
 190         } else {
 191                 ret = parse_ipv6(addr, ifaces, port, saddr);
 192         }
 193
 194         return ret;
 195 }
 196
 197 /*
 198   parse a ip/mask pair
 199  */
 200 bool parse_ip_mask(const char *str, const char *ifaces, ctdb_sock_addr *addr, unsigned *mask)
 201 {
 202         char *p;
 203         char s[64]; /* Much longer than INET6_ADDRSTRLEN */
 204         char *endp = NULL;
 205         ssize_t len;
 206         bool ret;
 207
 208         ZERO_STRUCT(*addr);
 209
 210         len = strlen(str);
 211         if (len >= sizeof(s)) {
 212                 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", str));
 213                 return false;
 214         }
 215
 216         strncpy(s, str, len+1);
 217
 218         p = rindex(s, '/');
 219         if (p == NULL) {
 220                 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
 221                 return false;
 222         }
 223
 224         *mask = strtoul(p+1, &endp, 10);
 225         if (endp == NULL || *endp != 0) {
 226                 /* trailing garbage */
 227                 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the mask in %s\n", s));
 228                 return false;
 229         }
 230         *p = 0;
 231
 232
 233         /* now is this a ipv4 or ipv6 address ?*/
 234         ret = parse_ip(s, ifaces, 0, addr);
 235
 236         return ret;
 237 }
 238
 239 /*
 240   parse a ip:port pair
 241  */
 242 bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr)
 243 {
 244         char *p;
 245         char s[64]; /* Much longer than INET6_ADDRSTRLEN */
 246         unsigned port;
 247         char *endp = NULL;
 248         ssize_t len;
 249         bool ret;
 250
 251         len = strlen(addr);
 252         if (len >= sizeof(s)) {
 253                 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", addr));
 254                 return false;
 255         }
 256
 257         strncpy(s, addr, len+1);
 258
 259         p = rindex(s, ':');
 260         if (p == NULL) {
 261                 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a port number\n", s));
 262                 return false;
 263         }
 264
 265         port = strtoul(p+1, &endp, 10);
 266         if (endp == NULL || *endp != 0) {
 267                 /* trailing garbage */
 268                 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the port in %s\n", s));
 269                 return false;
 270         }
 271         *p = 0;
 272
 273         /* now is this a ipv4 or ipv6 address ?*/
 274         ret = parse_ip(s, NULL, port, saddr);
 275
 276         return ret;
 277 }
 278
 279 /* we don't lock future pages here; it would increase the chance that
 280  * we'd fail to mmap later on. */
 281 void lockdown_memory(bool valgrinding)
 282 {
 283 #if defined(HAVE_MLOCKALL) && !defined(_AIX_)
 284         /* Extra stack, please! */
 285         char dummy[10000];
 286         memset(dummy, 0, sizeof(dummy));
 287
 288         if (valgrinding) {
 289                 return;
 290         }
 291
 292         /* Ignore when running in local daemons mode */
 293         if (getuid() != 0) {
 294                 return;
 295         }
 296
 297         /* Avoid compiler optimizing out dummy. */
 298         mlock(dummy, sizeof(dummy));
 299         if (mlockall(MCL_CURRENT) != 0) {
 300                 DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n",
 301                                      strerror(errno)));
 302         }
 303 #endif
 304 }
 305
 306 int mkdir_p(const char *dir, int mode)
 307 {
 308         char t[PATH_MAX];
 309         ssize_t len;
 310         int ret;
 311
 312         if (strcmp(dir, "/") == 0) {
 313                 return 0;
 314         }
 315
 316         if (strcmp(dir, ".") == 0) {
 317                 return 0;
 318         }
 319
 320         /* Try to create directory */
 321         ret = mkdir(dir, mode);
 322         /* Succeed if that worked or if it already existed */
 323         if (ret == 0 || errno == EEXIST) {
 324                 return 0;
 325         }
 326         /* Fail on anything else except ENOENT */
 327         if (errno != ENOENT) {
 328                 return ret;
 329         }
 330
 331         /* Create ancestors */
 332         len = strlen(dir);
 333         if (len >= PATH_MAX) {
 334                 errno = ENAMETOOLONG;
 335                 return -1;
 336         }
 337         strncpy(t, dir, len+1);
 338
 339         ret = mkdir_p(dirname(t), mode);
 340         if (ret != 0) {
 341                 return ret;
 342         }
 343
 344         /* Create directory */
 345         ret = mkdir(dir, mode);
 346         if ((ret == -1) && (errno == EEXIST)) {
 347                 ret = 0;
 348         }
 349
 350         return ret;
 351 }
 352
 353 void mkdir_p_or_die(const char *dir, int mode)
 354 {
 355         int ret;
 356
 357         ret = mkdir_p(dir, mode);
 358         if (ret != 0) {
 359                 DEBUG(DEBUG_ALERT,
 360                       ("ctdb exiting with error: "
 361                        "failed to create directory \"%s\" (%s)\n",
 362                        dir, strerror(errno)));
 363                 exit(1);
 364         }
 365 }