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 /*
  45   if possible, make this task real time
  46  */
  47 bool set_scheduler(void)
  48 {
  49 #ifdef _AIX_
  50 #if HAVE_THREAD_SETSCHED
  51         struct thrdentry64 te;
  52         tid64_t ti;
  53
  54         ti = 0ULL;
  55         if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
  56                 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
  57                 return false;
  58         }
  59
  60         if (thread_setsched(te.ti_tid, 0, SCHED_RR) == -1) {
  61                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_RR (%s)\n",
  62                                   strerror(errno)));
  63                 return false;
  64         } else {
  65                 return true;
  66         }
  67 #endif
  68 #else /* no AIX */
  69 #if HAVE_SCHED_SETSCHEDULER
  70         struct sched_param p;
  71         int policy = SCHED_FIFO;
  72
  73         p.sched_priority = 1;
  74
  75 #ifdef SCHED_RESET_ON_FORK
  76         policy |= SCHED_RESET_ON_FORK;
  77 #endif
  78         if (sched_setscheduler(0, policy, &p) == -1) {
  79                 DEBUG(DEBUG_CRIT,("Unable to set scheduler to SCHED_FIFO (%s)\n",
  80                          strerror(errno)));
  81                 return false;
  82         } else {
  83                 return true;
  84         }
  85 #endif
  86 #endif
  87         DEBUG(DEBUG_CRIT,("No way to set real-time priority.\n"));
  88         return false;
  89 }
  90
  91 /*
  92   reset scheduler from real-time to normal scheduling
  93  */
  94 void reset_scheduler(void)
  95 {
  96 #ifdef _AIX_
  97 #if HAVE_THREAD_SETSCHED
  98         struct thrdentry64 te;
  99         tid64_t ti;
 100
 101         ti = 0ULL;
 102         if (getthrds64(getpid(), &te, sizeof(te), &ti, 1) != 1) {
 103                 DEBUG(DEBUG_ERR, ("Unable to get thread information\n"));
 104         }
 105         if (thread_setsched(te.ti_tid, 0, SCHED_OTHER) == -1) {
 106                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
 107         }
 108 #endif
 109 #else /* no AIX */
 110 #if HAVE_SCHED_SETSCHEDULER
 111 #ifndef SCHED_RESET_ON_FORK
 112         struct sched_param p;
 113
 114         p.sched_priority = 0;
 115         if (sched_setscheduler(0, SCHED_OTHER, &p) == -1) {
 116                 DEBUG(DEBUG_ERR, ("Unable to set scheduler to SCHED_OTHER\n"));
 117         }
 118 #endif
 119 #endif
 120 #endif
 121 }
 122
 123 bool parse_ipv4(const char *s, unsigned port, struct sockaddr_in *sin)
 124 {
 125         sin->sin_family = AF_INET;
 126         sin->sin_port   = htons(port);
 127
 128         if (inet_pton(AF_INET, s, &sin->sin_addr) != 1) {
 129                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin_addr\n", s));
 130                 return false;
 131         }
 132
 133 #ifdef HAVE_SOCK_SIN_LEN
 134         sin->sin_len = sizeof(*sin);
 135 #endif
 136         return true;
 137 }
 138
 139 static bool parse_ipv6(const char *s, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
 140 {
 141         saddr->ip6.sin6_family   = AF_INET6;
 142         saddr->ip6.sin6_port     = htons(port);
 143         saddr->ip6.sin6_flowinfo = 0;
 144         saddr->ip6.sin6_scope_id = 0;
 145
 146         if (inet_pton(AF_INET6, s, &saddr->ip6.sin6_addr) != 1) {
 147                 DEBUG(DEBUG_ERR, (__location__ " Failed to translate %s into sin6_addr\n", s));
 148                 return false;
 149         }
 150
 151         if (ifaces && IN6_IS_ADDR_LINKLOCAL(&saddr->ip6.sin6_addr)) {
 152                 if (strchr(ifaces, ',')) {
 153                         DEBUG(DEBUG_ERR, (__location__ " Link local address %s "
 154                                           "is specified for multiple ifaces %s\n",
 155                                           s, ifaces));
 156                         return false;
 157                 }
 158                 saddr->ip6.sin6_scope_id = if_nametoindex(ifaces);
 159         }
 160
 161 #ifdef HAVE_SOCK_SIN_LEN
 162         saddr->ip6.sin6_len = sizeof(*saddr);
 163 #endif
 164         return true;
 165 }
 166
 167 /*
 168   parse an ip
 169  */
 170 bool parse_ip(const char *addr, const char *ifaces, unsigned port, ctdb_sock_addr *saddr)
 171 {
 172         char *p;
 173         bool ret;
 174
 175         ZERO_STRUCTP(saddr); /* valgrind :-) */
 176
 177         /* now is this a ipv4 or ipv6 address ?*/
 178         p = index(addr, ':');
 179         if (p == NULL) {
 180                 ret = parse_ipv4(addr, port, &saddr->ip);
 181         } else {
 182                 ret = parse_ipv6(addr, ifaces, port, saddr);
 183         }
 184
 185         return ret;
 186 }
 187
 188 /*
 189   parse a ip/mask pair
 190  */
 191 bool parse_ip_mask(const char *str, const char *ifaces, ctdb_sock_addr *addr, unsigned *mask)
 192 {
 193         char *p;
 194         char s[64]; /* Much longer than INET6_ADDRSTRLEN */
 195         char *endp = NULL;
 196         ssize_t len;
 197         bool ret;
 198
 199         ZERO_STRUCT(*addr);
 200
 201         len = strlen(str);
 202         if (len >= sizeof(s)) {
 203                 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", str));
 204                 return false;
 205         }
 206
 207         strncpy(s, str, len+1);
 208
 209         p = rindex(s, '/');
 210         if (p == NULL) {
 211                 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a mask\n", s));
 212                 return false;
 213         }
 214
 215         *mask = strtoul(p+1, &endp, 10);
 216         if (endp == NULL || *endp != 0) {
 217                 /* trailing garbage */
 218                 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the mask in %s\n", s));
 219                 return false;
 220         }
 221         *p = 0;
 222
 223
 224         /* now is this a ipv4 or ipv6 address ?*/
 225         ret = parse_ip(s, ifaces, 0, addr);
 226
 227         return ret;
 228 }
 229
 230 /*
 231   parse a ip:port pair
 232  */
 233 bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr)
 234 {
 235         char *p;
 236         char s[64]; /* Much longer than INET6_ADDRSTRLEN */
 237         unsigned port;
 238         char *endp = NULL;
 239         ssize_t len;
 240         bool ret;
 241
 242         len = strlen(addr);
 243         if (len >= sizeof(s)) {
 244                 DEBUG(DEBUG_ERR, ("Address %s is unreasonably long\n", addr));
 245                 return false;
 246         }
 247
 248         strncpy(s, addr, len+1);
 249
 250         p = rindex(s, ':');
 251         if (p == NULL) {
 252                 DEBUG(DEBUG_ERR, (__location__ " This addr: %s does not contain a port number\n", s));
 253                 return false;
 254         }
 255
 256         port = strtoul(p+1, &endp, 10);
 257         if (endp == NULL || *endp != 0) {
 258                 /* trailing garbage */
 259                 DEBUG(DEBUG_ERR, (__location__ " Trailing garbage after the port in %s\n", s));
 260                 return false;
 261         }
 262         *p = 0;
 263
 264         /* now is this a ipv4 or ipv6 address ?*/
 265         ret = parse_ip(s, NULL, port, saddr);
 266
 267         return ret;
 268 }
 269
 270 /* we don't lock future pages here; it would increase the chance that
 271  * we'd fail to mmap later on. */
 272 void lockdown_memory(bool valgrinding)
 273 {
 274 #if defined(HAVE_MLOCKALL) && !defined(_AIX_)
 275         /* Extra stack, please! */
 276         char dummy[10000];
 277         memset(dummy, 0, sizeof(dummy));
 278
 279         if (valgrinding) {
 280                 return;
 281         }
 282
 283         /* Ignore when running in local daemons mode */
 284         if (getuid() != 0) {
 285                 return;
 286         }
 287
 288         /* Avoid compiler optimizing out dummy. */
 289         mlock(dummy, sizeof(dummy));
 290         if (mlockall(MCL_CURRENT) != 0) {
 291                 DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n",
 292                                      strerror(errno)));
 293         }
 294 #endif
 295 }
 296
 297 int mkdir_p(const char *dir, int mode)
 298 {
 299         char t[PATH_MAX];
 300         ssize_t len;
 301         int ret;
 302
 303         if (strcmp(dir, "/") == 0) {
 304                 return 0;
 305         }
 306
 307         if (strcmp(dir, ".") == 0) {
 308                 return 0;
 309         }
 310
 311         /* Try to create directory */
 312         ret = mkdir(dir, mode);
 313         /* Succeed if that worked or if it already existed */
 314         if (ret == 0 || errno == EEXIST) {
 315                 return 0;
 316         }
 317         /* Fail on anything else except ENOENT */
 318         if (errno != ENOENT) {
 319                 return ret;
 320         }
 321
 322         /* Create ancestors */
 323         len = strlen(dir);
 324         if (len >= PATH_MAX) {
 325                 errno = ENAMETOOLONG;
 326                 return -1;
 327         }
 328         strncpy(t, dir, len+1);
 329
 330         ret = mkdir_p(dirname(t), mode);
 331         if (ret != 0) {
 332                 return ret;
 333         }
 334
 335         /* Create directory */
 336         ret = mkdir(dir, mode);
 337         if ((ret == -1) && (errno == EEXIST)) {
 338                 ret = 0;
 339         }
 340
 341         return ret;
 342 }
 343
 344 void mkdir_p_or_die(const char *dir, int mode)
 345 {
 346         int ret;
 347
 348         ret = mkdir_p(dir, mode);
 349         if (ret != 0) {
 350                 DEBUG(DEBUG_ALERT,
 351                       ("ctdb exiting with error: "
 352                        "failed to create directory \"%s\" (%s)\n",
 353                        dir, strerror(errno)));
 354                 exit(1);
 355         }
 356 }
 357
 358 /* A read wrapper that will deal with EINTR.  For now, copied from
 359  * source3/lib/system.c
 360  */
 361 ssize_t sys_read(int fd, void *buf, size_t count)
 362 {
 363         ssize_t ret;
 364
 365         do {
 366                 ret = read(fd, buf, count);
 367 #if defined(EWOULDBLOCK)
 368         } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
 369 #else
 370         } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
 371 #endif
 372         return ret;
 373 }
 374
 375 /* A write wrapper that will deal with EINTR.  For now, copied from
 376  * source3/lib/system.c
 377  */
 378 ssize_t sys_write(int fd, const void *buf, size_t count)
 379 {
 380         ssize_t ret;
 381
 382         do {
 383                 ret = write(fd, buf, count);
 384 #if defined(EWOULDBLOCK)
 385         } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
 386 #else
 387         } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
 388 #endif
 389         return ret;
 390 }
 391
 392 void ctdb_wait_for_process_to_exit(pid_t pid)
 393 {
 394         while (kill(pid, 0) == 0 || errno != ESRCH) {
 395                 sleep(5);
 396         }
 397 }
 398
 399 int ctdb_parse_connections(FILE *fp, TALLOC_CTX *mem_ctx,
 400                            int *num_conn, struct ctdb_connection **out)
 401 {
 402         struct ctdb_connection *conn = NULL;
 403         char line[128], src[128], dst[128]; /* long enough for IPv6 */
 404         int line_num, ret;
 405         int num = 0, max = 0;
 406
 407         line_num = 0;
 408         while (! feof(fp)) {
 409                 if (fgets(line, sizeof(line), fp) == NULL) {
 410                         break;
 411                 }
 412                 line_num += 1;
 413
 414                 /* Skip empty lines */
 415                 if (line[0] == '\n') {
 416                         continue;
 417                 }
 418
 419                 ret = sscanf(line, "%s %s\n", src, dst);
 420                 if (ret != 2) {
 421                         DEBUG(DEBUG_ERR, ("Bad line [%d]: %s\n",
 422                                           line_num, line));
 423                         return EINVAL;
 424                 }
 425
 426                 if (num >= max) {
 427                         max += 1024;
 428                         conn = talloc_realloc(mem_ctx, conn,
 429                                               struct ctdb_connection, max);
 430                         if (conn == NULL) {
 431                                 return ENOMEM;
 432                         }
 433                 }
 434
 435                 if (! parse_ip_port(src, &conn[num].src)) {
 436                         DEBUG(DEBUG_ERR, ("Invalid IP address %s\n", src));
 437                         return EINVAL;
 438                 }
 439
 440                 if (! parse_ip_port(dst, &conn[num].dst)) {
 441                         DEBUG(DEBUG_ERR, ("Invalid IP address %s\n", dst));
 442                         return EINVAL;
 443                 }
 444
 445                 num += 1;
 446         }
 447
 448         *num_conn = num;
 449         *out = conn;
 450         return 0;
 451 }