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         int policy = SCHED_FIFO;
  63
  64         p.sched_priority = 1;
  65
  66 #ifdef SCHED_RESET_ON_FORK
  67         policy |= SCHED_RESET_ON_FORK;
  68 #endif
  69         if (sched_setscheduler(0, policy, &p) == -1) {
  70                 DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n",
  71                          strerror(errno)));
  72         } else {
  73                 DEBUG(DEBUG_NOTICE,("Set scheduler to SCHED_FIFO\n"));
  74         }
  75 #endif
  76 #endif
  77 }
  78
  79 /*
  80   reset scheduler from real-time to normal scheduling
  81  */
  82 void reset_scheduler(void)
  83 {
  84 #ifdef _AIX_
  85 #if HAVE_THREAD_SETSCHED
  86         struct thrdentry64 te;
  87         tid64_t ti;
  88
  89         ti = 0ULL;
  90         if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
  91                 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
  92         }
  93         if (thread_setsched(te.ti_tid, 0, SCHED_OTHER) == -1) {
  94                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
  95         }
  96 #endif
  97 #else /* no AIX */
  98 #if HAVE_SCHED_SETSCHEDULER
  99 #ifndef SCHED_RESET_ON_FORK
 100         struct sched_param p;
 101
 102         p.sched_priority = 0;
 103         if (sched_setscheduler(0, SCHED_OTHER, &p) == -1) {
 104                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
 105         }
 106 #endif
 107 #endif
 108 #endif
 109 }
 110
 111 void set_nonblocking(int fd)
 112 {
 113         int v;
 114
 115         v = fcntl(fd, F_GETFL, 0);
 116         if (v == -1) {
 117                 DEBUG(DEBUG_WARNING, ("Failed to get file status flags - %s\n",
 118                                       strerror(errno)));
 119                 return;
 120         }
 121         if (fcntl(fd, F_SETFL, v | O_NONBLOCK) == -1) {
 122                 DEBUG(DEBUG_WARNING, ("Failed to set non_blocking on fd - %s\n",
 123                                       strerror(errno)));
 124         }
 125 }
 126
 127 void set_close_on_exec(int fd)
 128 {
 129         int v;
 130
 131         v = fcntl(fd, F_GETFD, 0);
 132         if (v == -1) {
 133                 DEBUG(DEBUG_WARNING, ("Failed to get file descriptor flags - %s\n",
 134                                       strerror(errno)));
 135                 return;
 136         }
 137         if (fcntl(fd, F_SETFD, v | FD_CLOEXEC) != 0) {
 138                 DEBUG(DEBUG_WARNING, ("Failed to set close_on_exec on fd - %s\n",
 139                                       strerror(errno)));
 140         }
 141 }
 142
 143
 144 bool parse_ipv4(const char *s, unsigned port, struct sockaddr_in *sin)
 145 {
 146         sin->sin_family = AF_INET;
 147         sin->sin_port   = htons(port);
 148
 149         if (inet_pton(AF_INET, s, &sin->sin_addr) != 1) {
 150                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin_addr\n", s));
 151                 return false;
 152         }
 153
 154         return true;
 155 }
 156
 157 static bool parse_ipv6(const char *s, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
 158 {
 159         saddr->ip6.sin6_family   = AF_INET6;
 160         saddr->ip6.sin6_port     = htons(port);
 161         saddr->ip6.sin6_flowinfo = 0;
 162         saddr->ip6.sin6_scope_id = 0;
 163
 164         if (inet_pton(AF_INET6, s, &saddr->ip6.sin6_addr) != 1) {
 165                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin6_addr\n", s));
 166                 return false;
 167         }
 168
 169         if (ifaces && IN6_IS_ADDR_LINKLOCAL(&saddr->ip6.sin6_addr)) {
 170                 if (strchr(ifaces, ',')) {
 171                         DEBUG(DEBUG_ERR, (__location__ " Link local address %s "
 172                                           "is specified for multiple ifaces %s\n",
 173                                           s, ifaces));
 174                         return false;
 175                 }
 176                 saddr->ip6.sin6_scope_id = if_nametoindex(ifaces);
 177         }
 178
 179         return true;
 180 }
 181
 182 /*
 183   parse an ip
 184  */
 185 bool parse_ip(const char *addr, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
 186 {
 187         char *p;
 188         bool ret;
 189
 190         ZERO_STRUCTP(saddr); /* valgrind :-) */
 191
 192         /* now is this a ipv4 or ipv6 address ?*/
 193         p = index(addr, ':');
 194         if (p == NULL) {
 195                 ret = parse_ipv4(addr, port, &saddr->ip);
 196         } else {
 197                 ret = parse_ipv6(addr, ifaces, port, saddr);
 198         }
 199
 200         return ret;
 201 }
 202
 203 /*
 204   parse a ip/mask pair
 205  */
 206 bool parse_ip_mask(const char *str, const char *ifaces, ctdb_sock_addr *addr, unsigned *mask)
 207 {
 208         char *p;
 209         char s[64]; /* Much longer than INET6_ADDRSTRLEN */
 210         char *endp = NULL;
 211         ssize_t len;
 212         bool ret;
 213
 214         ZERO_STRUCT(*addr);
 215
 216         len = strlen(str);
 217         if (len >= sizeof(s)) {
 218                 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", str));
 219                 return false;
 220         }
 221
 222         strncpy(s, str, len+1);
 223
 224         p = rindex(s, '/');
 225         if (p == NULL) {
 226                 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
 227                 return false;
 228         }
 229
 230         *mask = strtoul(p+1, &endp, 10);
 231         if (endp == NULL || *endp != 0) {
 232                 /* trailing garbage */
 233                 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the mask in %s\n", s));
 234                 return false;
 235         }
 236         *p = 0;
 237
 238
 239         /* now is this a ipv4 or ipv6 address ?*/
 240         ret = parse_ip(s, ifaces, 0, addr);
 241
 242         return ret;
 243 }
 244
 245 /*
 246   parse a ip:port pair
 247  */
 248 bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr)
 249 {
 250         char *p;
 251         char s[64]; /* Much longer than INET6_ADDRSTRLEN */
 252         unsigned port;
 253         char *endp = NULL;
 254         ssize_t len;
 255         bool ret;
 256
 257         len = strlen(addr);
 258         if (len >= sizeof(s)) {
 259                 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", addr));
 260                 return false;
 261         }
 262
 263         strncpy(s, addr, len+1);
 264
 265         p = rindex(s, ':');
 266         if (p == NULL) {
 267                 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a port number\n", s));
 268                 return false;
 269         }
 270
 271         port = strtoul(p+1, &endp, 10);
 272         if (endp == NULL || *endp != 0) {
 273                 /* trailing garbage */
 274                 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the port in %s\n", s));
 275                 return false;
 276         }
 277         *p = 0;
 278
 279         /* now is this a ipv4 or ipv6 address ?*/
 280         ret = parse_ip(s, NULL, port, saddr);
 281
 282         return ret;
 283 }
 284
 285 /* we don't lock future pages here; it would increase the chance that
 286  * we'd fail to mmap later on. */
 287 void lockdown_memory(bool valgrinding)
 288 {
 289 #if defined(HAVE_MLOCKALL) && !defined(_AIX_)
 290         /* Extra stack, please! */
 291         char dummy[10000];
 292         memset(dummy, 0, sizeof(dummy));
 293
 294         if (valgrinding) {
 295                 return;
 296         }
 297
 298         /* Ignore when running in local daemons mode */
 299         if (getuid() != 0) {
 300                 return;
 301         }
 302
 303         /* Avoid compiler optimizing out dummy. */
 304         mlock(dummy, sizeof(dummy));
 305         if (mlockall(MCL_CURRENT) != 0) {
 306                 DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n",
 307                                      strerror(errno)));
 308         }
 309 #endif
 310 }
 311
 312 int mkdir_p(const char *dir, int mode)
 313 {
 314         char t[PATH_MAX];
 315         ssize_t len;
 316         int ret;
 317
 318         if (strcmp(dir, "/") == 0) {
 319                 return 0;
 320         }
 321
 322         if (strcmp(dir, ".") == 0) {
 323                 return 0;
 324         }
 325
 326         /* Try to create directory */
 327         ret = mkdir(dir, mode);
 328         /* Succeed if that worked or if it already existed */
 329         if (ret == 0 || errno == EEXIST) {
 330                 return 0;
 331         }
 332         /* Fail on anything else except ENOENT */
 333         if (errno != ENOENT) {
 334                 return ret;
 335         }
 336
 337         /* Create ancestors */
 338         len = strlen(dir);
 339         if (len >= PATH_MAX) {
 340                 errno = ENAMETOOLONG;
 341                 return -1;
 342         }
 343         strncpy(t, dir, len+1);
 344
 345         ret = mkdir_p(dirname(t), mode);
 346         if (ret != 0) {
 347                 return ret;
 348         }
 349
 350         /* Create directory */
 351         ret = mkdir(dir, mode);
 352         if ((ret == -1) && (errno == EEXIST)) {
 353                 ret = 0;
 354         }
 355
 356         return ret;
 357 }
 358
 359 void mkdir_p_or_die(const char *dir, int mode)
 360 {
 361         int ret;
 362
 363         ret = mkdir_p(dir, mode);
 364         if (ret != 0) {
 365                 DEBUG(DEBUG_ALERT,
 366                       ("ctdb exiting with error: "
 367                        "failed to create directory \"%s\" (%s)\n",
 368                        dir, strerror(errno)));
 369                 exit(1);
 370         }
 371 }