/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2015 Nexenta Systems, Inc. All rights reserved. */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * University Copyright- Copyright (c) 1982, 1986, 1988 * The Regents of the University of California * All Rights Reserved * * University Acknowledgment- Portions of this document are derived from * software developed by the University of California, Berkeley, and its * contributors. */ /* * Copyright (c) 2012 by Delphix. All rights reserved. */ /* * sm_statd.c consists of routines used for the intermediate * statd implementation(3.2 rpc.statd); * it creates an entry in "current" directory for each site that it monitors; * after crash and recovery, it moves all entries in "current" * to "backup" directory, and notifies the corresponding statd of its recovery. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sm_statd.h" int LOCAL_STATE; sm_hash_t mon_table[MAX_HASHSIZE]; static sm_hash_t record_table[MAX_HASHSIZE]; static sm_hash_t recov_q; static name_entry *find_name(name_entry **namepp, char *name); static name_entry *insert_name(name_entry **namepp, char *name, int need_alloc); static void delete_name(name_entry **namepp, char *name); static void remove_name(char *name, int op, int startup); static int statd_call_statd(char *name); static void pr_name(char *name, int flag); static void *thr_statd_init(void *); static void *sm_try(void *); static void *thr_call_statd(void *); static void remove_single_name(char *name, char *dir1, char *dir2); static int move_file(char *fromdir, char *file, char *todir); static int count_symlinks(char *dir, char *name, int *count); static char *family2string(sa_family_t family); /* * called when statd first comes up; it searches /etc/sm to gather * all entries to notify its own failure */ void statd_init(void) { struct dirent *dirp; DIR *dp; FILE *fp, *fp_tmp; int i, tmp_state; char state_file[MAXPATHLEN+SM_MAXPATHLEN]; if (debug) (void) printf("enter statd_init\n"); /* * First try to open the file. If that fails, try to create it. * If that fails, give up. */ if ((fp = fopen(STATE, "r+")) == NULL) { if ((fp = fopen(STATE, "w+")) == NULL) { syslog(LOG_ERR, "can't open %s: %m", STATE); exit(1); } else (void) chmod(STATE, 0644); } if ((fscanf(fp, "%d", &LOCAL_STATE)) == EOF) { if (debug >= 2) (void) printf("empty file\n"); LOCAL_STATE = 0; } /* * Scan alternate paths for largest "state" number */ for (i = 0; i < pathix; i++) { (void) sprintf(state_file, "%s/statmon/state", path_name[i]); if ((fp_tmp = fopen(state_file, "r+")) == NULL) { if ((fp_tmp = fopen(state_file, "w+")) == NULL) { if (debug) syslog(LOG_ERR, "can't open %s: %m", state_file); continue; } else (void) chmod(state_file, 0644); } if ((fscanf(fp_tmp, "%d", &tmp_state)) == EOF) { if (debug) syslog(LOG_ERR, "statd: %s: file empty\n", state_file); (void) fclose(fp_tmp); continue; } if (tmp_state > LOCAL_STATE) { LOCAL_STATE = tmp_state; if (debug) (void) printf("Update LOCAL STATE: %d\n", tmp_state); } (void) fclose(fp_tmp); } LOCAL_STATE = ((LOCAL_STATE%2) == 0) ? LOCAL_STATE+1 : LOCAL_STATE+2; /* IF local state overflows, reset to value 1 */ if (LOCAL_STATE < 0) { LOCAL_STATE = 1; } /* Copy the LOCAL_STATE value back to all stat files */ if (fseek(fp, 0, 0) == -1) { syslog(LOG_ERR, "statd: fseek failed\n"); exit(1); } (void) fprintf(fp, "%-10d", LOCAL_STATE); (void) fflush(fp); if (fsync(fileno(fp)) == -1) { syslog(LOG_ERR, "statd: fsync failed\n"); exit(1); } (void) fclose(fp); for (i = 0; i < pathix; i++) { (void) sprintf(state_file, "%s/statmon/state", path_name[i]); if ((fp_tmp = fopen(state_file, "r+")) == NULL) { if ((fp_tmp = fopen(state_file, "w+")) == NULL) { syslog(LOG_ERR, "can't open %s: %m", state_file); continue; } else (void) chmod(state_file, 0644); } (void) fprintf(fp_tmp, "%-10d", LOCAL_STATE); (void) fflush(fp_tmp); if (fsync(fileno(fp_tmp)) == -1) { syslog(LOG_ERR, "statd: %s: fsync failed\n", state_file); (void) fclose(fp_tmp); exit(1); } (void) fclose(fp_tmp); } if (debug) (void) printf("local state = %d\n", LOCAL_STATE); if ((mkdir(CURRENT, SM_DIRECTORY_MODE)) == -1) { if (errno != EEXIST) { syslog(LOG_ERR, "statd: mkdir current, error %m\n"); exit(1); } } if ((mkdir(BACKUP, SM_DIRECTORY_MODE)) == -1) { if (errno != EEXIST) { syslog(LOG_ERR, "statd: mkdir backup, error %m\n"); exit(1); } } /* get all entries in CURRENT into BACKUP */ if ((dp = opendir(CURRENT)) == NULL) { syslog(LOG_ERR, "statd: open current directory, error %m\n"); exit(1); } while ((dirp = readdir(dp)) != NULL) { if (strcmp(dirp->d_name, ".") != 0 && strcmp(dirp->d_name, "..") != 0) { /* rename all entries from CURRENT to BACKUP */ (void) move_file(CURRENT, dirp->d_name, BACKUP); } } (void) closedir(dp); /* Contact hosts' statd */ if (thr_create(NULL, 0, thr_statd_init, NULL, THR_DETACHED, NULL)) { syslog(LOG_ERR, "statd: unable to create thread for thr_statd_init\n"); exit(1); } } /* * Work thread which contacts hosts' statd. */ static void * thr_statd_init(void *arg __unused) { struct dirent *dirp; DIR *dp; int num_threads; int num_join; int i; char *name; char buf[MAXPATHLEN+SM_MAXPATHLEN]; /* Go thru backup directory and contact hosts */ if ((dp = opendir(BACKUP)) == NULL) { syslog(LOG_ERR, "statd: open backup directory, error %m\n"); exit(1); } /* * Create "UNDETACHED" threads for each symlink and (unlinked) * regular file in backup directory to initiate statd_call_statd. * NOTE: These threads are the only undetached threads in this * program and thus, the thread id is not needed to join the threads. */ num_threads = 0; while ((dirp = readdir(dp)) != NULL) { /* * If host file is not a symlink, don't bother to * spawn a thread for it. If any link(s) refer to * it, the host will be contacted using the link(s). * If not, we'll deal with it during the legacy pass. */ (void) sprintf(buf, "%s/%s", BACKUP, dirp->d_name); if (is_symlink(buf) == 0) { continue; } /* * If the num_threads has exceeded, wait until * a certain amount of threads have finished. * Currently, 10% of threads created should be joined. */ if (num_threads > MAX_THR) { num_join = num_threads/PERCENT_MINJOIN; for (i = 0; i < num_join; i++) thr_join(0, 0, 0); num_threads -= num_join; } /* * If can't alloc name then print error msg and * continue to next item on list. */ name = strdup(dirp->d_name); if (name == NULL) { syslog(LOG_ERR, "statd: unable to allocate space for name %s\n", dirp->d_name); continue; } /* Create a thread to do a statd_call_statd for name */ if (thr_create(NULL, 0, thr_call_statd, name, 0, NULL)) { syslog(LOG_ERR, "statd: unable to create thr_call_statd() " "for name %s.\n", dirp->d_name); free(name); continue; } num_threads++; } /* * Join the other threads created above before processing the * legacies. This allows all symlinks and the regular files * to which they correspond to be processed and deleted. */ for (i = 0; i < num_threads; i++) { thr_join(0, 0, 0); } /* * The second pass checks for `legacies': regular files which * never had symlinks pointing to them at all, just like in the * good old (pre-1184192 fix) days. Once a machine has cleaned * up its legacies they should only reoccur due to catastrophes * (e.g., severed symlinks). */ rewinddir(dp); num_threads = 0; while ((dirp = readdir(dp)) != NULL) { if (strcmp(dirp->d_name, ".") == 0 || strcmp(dirp->d_name, "..") == 0) { continue; } (void) sprintf(buf, "%s/%s", BACKUP, dirp->d_name); if (is_symlink(buf)) { /* * We probably couldn't reach this host and it's * been put on the recovery queue for retry. * Skip it and keep looking for regular files. */ continue; } if (debug) { (void) printf("thr_statd_init: legacy %s\n", dirp->d_name); } /* * If the number of threads exceeds the maximum, wait * for some fraction of them to finish before * continuing. */ if (num_threads > MAX_THR) { num_join = num_threads/PERCENT_MINJOIN; for (i = 0; i < num_join; i++) thr_join(0, 0, 0); num_threads -= num_join; } /* * If can't alloc name then print error msg and * continue to next item on list. */ name = strdup(dirp->d_name); if (name == NULL) { syslog(LOG_ERR, "statd: unable to allocate space for name %s\n", dirp->d_name); continue; } /* Create a thread to do a statd_call_statd for name */ if (thr_create(NULL, 0, thr_call_statd, name, 0, NULL)) { syslog(LOG_ERR, "statd: unable to create thr_call_statd() " "for name %s.\n", dirp->d_name); free(name); continue; } num_threads++; } (void) closedir(dp); /* * Join the other threads created above before creating thread * to process items in recovery table. */ for (i = 0; i < num_threads; i++) { thr_join(0, 0, 0); } /* * Need to only copy /var/statmon/sm.bak to alternate paths, since * the only hosts in /var/statmon/sm should be the ones currently * being monitored and already should be in alternate paths as part * of insert_mon(). */ for (i = 0; i < pathix; i++) { (void) sprintf(buf, "%s/statmon/sm.bak", path_name[i]); if ((mkdir(buf, SM_DIRECTORY_MODE)) == -1) { if (errno != EEXIST) syslog(LOG_ERR, "statd: mkdir %s error %m\n", buf); else copydir_from_to(BACKUP, buf); } else copydir_from_to(BACKUP, buf); } /* * Reset the die and in_crash variables. */ mutex_lock(&crash_lock); die = 0; in_crash = 0; mutex_unlock(&crash_lock); if (debug) (void) printf("Creating thread for sm_try\n"); /* Continue to notify statd on hosts that were unreachable. */ if (thr_create(NULL, 0, sm_try, NULL, THR_DETACHED, NULL)) syslog(LOG_ERR, "statd: unable to create thread for sm_try().\n"); thr_exit(NULL); #ifdef lint return (0); #endif } /* * Work thread to make call to statd_call_statd. */ void * thr_call_statd(void *namep) { char *name = (char *)namep; /* * If statd of name is unreachable, add name to recovery table * otherwise if statd_call_statd was successful, remove from backup. */ if (statd_call_statd(name) != 0) { int n; char *tail; char path[MAXPATHLEN]; /* * since we are constructing this pathname below we add * another space for the terminating NULL so we don't * overflow our buffer when we do the readlink */ char rname[MAXNAMELEN + 1]; if (debug) { (void) printf( "statd call failed, inserting %s in recov_q\n", name); } mutex_lock(&recov_q.lock); (void) insert_name(&recov_q.sm_recovhdp, name, 0); mutex_unlock(&recov_q.lock); /* * If we queued a symlink name in the recovery queue, * we now clean up the regular file to which it referred. * This may leave a severed symlink if multiple links * referred to one regular file; this is unaesthetic but * it works. The big benefit is that it prevents us * from recovering the same host twice (as symlink and * as regular file) needlessly, usually on separate reboots. */ (void) strcpy(path, BACKUP); (void) strcat(path, "/"); (void) strcat(path, name); if (is_symlink(path)) { n = readlink(path, rname, MAXNAMELEN); if (n <= 0) { if (debug >= 2) { (void) printf( "thr_call_statd: can't read " "link %s\n", path); } } else { rname[n] = '\0'; tail = strrchr(path, '/') + 1; if ((strlen(BACKUP) + strlen(rname) + 2) <= MAXPATHLEN) { (void) strcpy(tail, rname); delete_file(path); } else if (debug) { printf("thr_call_statd: path over" "maxpathlen!\n"); } } } if (debug) pr_name(name, 0); } else { /* * If `name' is an IP address symlink to a name file, * remove it now. If it is the last such symlink, * remove the name file as well. Regular files with * no symlinks to them are assumed to be legacies and * are removed as well. */ remove_name(name, 1, 1); free(name); } thr_exit((void *) 0); #ifdef lint return (0); #endif } /* * Notifies the statd of host specified by name to indicate that * state has changed for this server. */ static int statd_call_statd(char *name) { enum clnt_stat clnt_stat; struct timeval tottimeout; CLIENT *clnt; char *name_or_addr; stat_chge ntf; int i; int rc; int dummy1, dummy2, dummy3, dummy4; char ascii_addr[MAXNAMELEN]; size_t unq_len; ntf.mon_name = hostname; ntf.state = LOCAL_STATE; if (debug) (void) printf("statd_call_statd at %s\n", name); /* * If it looks like an ASCII
.
specifier, * strip off the family - we just want the address when obtaining * a client handle. * If it's anything else, just pass it on to create_client(). */ unq_len = strcspn(name, "."); if ((strncmp(name, SM_ADDR_IPV4, unq_len) == 0) || (strncmp(name, SM_ADDR_IPV6, unq_len) == 0)) { name_or_addr = strchr(name, '.') + 1; } else { name_or_addr = name; } /* * NOTE: We depend here upon the fact that the RPC client code * allows us to use ASCII dotted quad `names', i.e. "192.9.200.1". * This may change in a future release. */ if (debug) { (void) printf("statd_call_statd: calling create_client(%s)\n", name_or_addr); } tottimeout.tv_sec = SM_RPC_TIMEOUT; tottimeout.tv_usec = 0; if ((clnt = create_client(name_or_addr, SM_PROG, SM_VERS, NULL, &tottimeout)) == NULL) { return (-1); } /* Perform notification to client */ rc = 0; clnt_stat = clnt_call(clnt, SM_NOTIFY, xdr_stat_chge, (char *)&ntf, xdr_void, NULL, tottimeout); if (debug) { (void) printf("clnt_stat=%s(%d)\n", clnt_sperrno(clnt_stat), clnt_stat); } if (clnt_stat != (int)RPC_SUCCESS) { syslog(LOG_WARNING, "statd: cannot talk to statd at %s, %s(%d)\n", name_or_addr, clnt_sperrno(clnt_stat), clnt_stat); rc = -1; } /* * Wait until the host_name is populated. */ (void) mutex_lock(&merges_lock); while (in_merges) (void) cond_wait(&merges_cond, &merges_lock); (void) mutex_unlock(&merges_lock); /* For HA systems and multi-homed hosts */ ntf.state = LOCAL_STATE; for (i = 0; i < addrix; i++) { ntf.mon_name = host_name[i]; if (debug) (void) printf("statd_call_statd at %s\n", name_or_addr); clnt_stat = clnt_call(clnt, SM_NOTIFY, xdr_stat_chge, (char *)&ntf, xdr_void, NULL, tottimeout); if (clnt_stat != (int)RPC_SUCCESS) { syslog(LOG_WARNING, "statd: cannot talk to statd at %s, %s(%d)\n", name_or_addr, clnt_sperrno(clnt_stat), clnt_stat); rc = -1; } } clnt_destroy(clnt); return (rc); } /* * Continues to contact hosts in recovery table that were unreachable. * NOTE: There should only be one sm_try thread executing and * thus locks are not needed for recovery table. Die is only cleared * after all the hosts has at least been contacted once. The reader/writer * lock ensures to finish this code before an sm_crash is started. Die * variable will signal it. */ void * sm_try(void *arg __unused) { name_entry *nl, *next; timestruc_t wtime; int delay = 0; rw_rdlock(&thr_rwlock); if (mutex_trylock(&sm_trylock)) goto out; mutex_lock(&crash_lock); while (!die) { wtime.tv_sec = delay; wtime.tv_nsec = 0; /* * Wait until signalled to wakeup or time expired. * If signalled to be awoken, then a crash has occurred * or otherwise time expired. */ if (cond_reltimedwait(&retrywait, &crash_lock, &wtime) == 0) { break; } /* Exit loop if queue is empty */ if ((next = recov_q.sm_recovhdp) == NULL) break; mutex_unlock(&crash_lock); while (((nl = next) != NULL) && (!die)) { next = next->nxt; if (statd_call_statd(nl->name) == 0) { /* remove name from BACKUP */ remove_name(nl->name, 1, 0); mutex_lock(&recov_q.lock); /* remove entry from recovery_q */ delete_name(&recov_q.sm_recovhdp, nl->name); mutex_unlock(&recov_q.lock); } else { /* * Print message only once since unreachable * host can be contacted forever. */ if (delay == 0) syslog(LOG_WARNING, "statd: host %s is not " "responding\n", nl->name); } } /* * Increment the amount of delay before restarting again. * The amount of delay should not exceed the MAX_DELAYTIME. */ if (delay <= MAX_DELAYTIME) delay += INC_DELAYTIME; mutex_lock(&crash_lock); } mutex_unlock(&crash_lock); mutex_unlock(&sm_trylock); out: rw_unlock(&thr_rwlock); if (debug) (void) printf("EXITING sm_try\n"); thr_exit((void *) 0); #ifdef lint return (0); #endif } /* * Malloc's space and returns the ptr to malloc'ed space. NULL if unsuccessful. */ char * xmalloc(unsigned len) { char *new; if ((new = malloc(len)) == 0) { syslog(LOG_ERR, "statd: malloc, error %m\n"); return (NULL); } else { (void) memset(new, 0, len); return (new); } } /* * the following two routines are very similar to * insert_mon and delete_mon in sm_proc.c, except the structture * is different */ static name_entry * insert_name(name_entry **namepp, char *name, int need_alloc) { name_entry *new; new = (name_entry *)xmalloc(sizeof (name_entry)); if (new == (name_entry *) NULL) return (NULL); /* Allocate name when needed which is only when adding to record_t */ if (need_alloc) { if ((new->name = strdup(name)) == NULL) { syslog(LOG_ERR, "statd: strdup, error %m\n"); free(new); return (NULL); } } else new->name = name; new->nxt = *namepp; if (new->nxt != NULL) new->nxt->prev = new; new->prev = (name_entry *) NULL; *namepp = new; if (debug) { (void) printf("insert_name: inserted %s at %p\n", name, (void *)namepp); } return (new); } /* * Deletes name from specified list (namepp). */ static void delete_name(name_entry **namepp, char *name) { name_entry *nl; nl = *namepp; while (nl != NULL) { if (str_cmp_address_specifier(nl->name, name) == 0 || str_cmp_unqual_hostname(nl->name, name) == 0) { if (nl->prev != NULL) nl->prev->nxt = nl->nxt; else *namepp = nl->nxt; if (nl->nxt != NULL) nl->nxt->prev = nl->prev; free(nl->name); free(nl); return; } nl = nl->nxt; } } /* * Finds name from specified list (namep). */ static name_entry * find_name(name_entry **namep, char *name) { name_entry *nl; nl = *namep; while (nl != NULL) { if (str_cmp_unqual_hostname(nl->name, name) == 0) { return (nl); } nl = nl->nxt; } return (NULL); } /* * Creates a file. */ int create_file(char *name) { int fd; /* * The file might already exist. If it does, we ask for only write * permission, since that's all the file was created with. */ if ((fd = open(name, O_CREAT | O_WRONLY, S_IWUSR)) == -1) { if (errno != EEXIST) { syslog(LOG_ERR, "can't open %s: %m", name); return (1); } } if (debug >= 2) (void) printf("%s is created\n", name); if (close(fd)) { syslog(LOG_ERR, "statd: close, error %m\n"); return (1); } return (0); } /* * Deletes the file specified by name. */ void delete_file(char *name) { if (debug >= 2) (void) printf("Remove monitor entry %s\n", name); if (unlink(name) == -1) { if (errno != ENOENT) syslog(LOG_ERR, "statd: unlink of %s, error %m", name); } } /* * Return 1 if file is a symlink, else 0. */ int is_symlink(char *file) { int error; struct stat lbuf; do { bzero((caddr_t)&lbuf, sizeof (lbuf)); error = lstat(file, &lbuf); } while (error == EINTR); if (error == 0) { return ((lbuf.st_mode & S_IFMT) == S_IFLNK); } return (0); } /* * Moves the file specified by `from' to `to' only if the * new file is guaranteed to be created (which is presumably * why we don't just do a rename(2)). If `from' is a * symlink, the destination file will be a similar symlink * in the directory of `to'. * * Returns 0 for success, 1 for failure. */ static int move_file(char *fromdir, char *file, char *todir) { int n; char rname[MAXNAMELEN + 1]; /* +1 for the terminating NULL */ char from[MAXPATHLEN]; char to[MAXPATHLEN]; (void) strcpy(from, fromdir); (void) strcat(from, "/"); (void) strcat(from, file); if (is_symlink(from)) { /* * Dig out the name of the regular file the link points to. */ n = readlink(from, rname, MAXNAMELEN); if (n <= 0) { if (debug >= 2) { (void) printf("move_file: can't read link %s\n", from); } return (1); } rname[n] = '\0'; /* * Create the link. */ if (create_symlink(todir, rname, file) != 0) { return (1); } } else { /* * Do what we've always done to move regular files. */ (void) strcpy(to, todir); (void) strcat(to, "/"); (void) strcat(to, file); if (create_file(to) != 0) { return (1); } } /* * Remove the old file if we've created the new one. */ if (unlink(from) < 0) { syslog(LOG_ERR, "move_file: unlink of %s, error %m", from); return (1); } return (0); } /* * Create a symbolic link named `lname' to regular file `rname'. * Both files should be in directory `todir'. */ int create_symlink(char *todir, char *rname, char *lname) { int error; char lpath[MAXPATHLEN]; /* * Form the full pathname of the link. */ (void) strcpy(lpath, todir); (void) strcat(lpath, "/"); (void) strcat(lpath, lname); /* * Now make the new symlink ... */ if (symlink(rname, lpath) < 0) { error = errno; if (error != 0 && error != EEXIST) { if (debug >= 2) { (void) printf("create_symlink: can't link " "%s/%s -> %s\n", todir, lname, rname); } return (1); } } if (debug) { if (error == EEXIST) { (void) printf("link %s/%s -> %s already exists\n", todir, lname, rname); } else { (void) printf("created link %s/%s -> %s\n", todir, lname, rname); } } return (0); } /* * remove the name from the specified directory * op = 0: CURRENT * op = 1: BACKUP */ static void remove_name(char *name, int op, int startup) { int i; char *alt_dir; char *queue; if (op == 0) { alt_dir = "statmon/sm"; queue = CURRENT; } else { alt_dir = "statmon/sm.bak"; queue = BACKUP; } remove_single_name(name, queue, NULL); /* * At startup, entries have not yet been copied to alternate * directories and thus do not need to be removed. */ if (startup == 0) { for (i = 0; i < pathix; i++) { remove_single_name(name, path_name[i], alt_dir); } } } /* * Remove the name from the specified directory, which is dir1/dir2 or * dir1, depending on whether dir2 is NULL. */ static void remove_single_name(char *name, char *dir1, char *dir2) { int n, error; char path[MAXPATHLEN+MAXNAMELEN+SM_MAXPATHLEN]; /* why > MAXPATHLEN? */ char dirpath[MAXPATHLEN]; char rname[MAXNAMELEN + 1]; /* +1 for NULL term */ if (strlen(name) + strlen(dir1) + (dir2 != NULL ? strlen(dir2) : 0) + 3 > MAXPATHLEN) { if (dir2 != NULL) syslog(LOG_ERR, "statd: pathname too long: %s/%s/%s\n", dir1, dir2, name); else syslog(LOG_ERR, "statd: pathname too long: %s/%s\n", dir1, name); return; } (void) strcpy(path, dir1); (void) strcat(path, "/"); if (dir2 != NULL) { (void) strcat(path, dir2); (void) strcat(path, "/"); } (void) strcpy(dirpath, path); /* save here - we may need it shortly */ (void) strcat(path, name); /* * Despite the name of this routine :-@), `path' may be a symlink * to a regular file. If it is, and if that file has no other * links to it, we must remove it now as well. */ if (is_symlink(path)) { n = readlink(path, rname, MAXNAMELEN); if (n > 0) { rname[n] = '\0'; if (count_symlinks(dirpath, rname, &n) < 0) { return; } if (n == 1) { (void) strcat(dirpath, rname); error = unlink(dirpath); if (debug >= 2) { if (error < 0) { (void) printf( "remove_name: can't " "unlink %s\n", dirpath); } else { (void) printf( "remove_name: unlinked ", "%s\n", dirpath); } } } } else { /* * Policy: if we can't read the symlink, leave it * here for analysis by the system administrator. */ syslog(LOG_ERR, "statd: can't read link %s: %m\n", path); } } /* * If it's a regular file, we can assume all symlinks and the * files to which they refer have been processed already - just * fall through to here to remove it. */ delete_file(path); } /* * Count the number of symlinks in `dir' which point to `name' (also in dir). * Passes back symlink count in `count'. * Returns 0 for success, < 0 for failure. */ static int count_symlinks(char *dir, char *name, int *count) { int cnt = 0; int n; DIR *dp; struct dirent *dirp; char lpath[MAXPATHLEN]; char rname[MAXNAMELEN + 1]; /* +1 for term NULL */ if ((dp = opendir(dir)) == NULL) { syslog(LOG_ERR, "count_symlinks: open %s dir, error %m\n", dir); return (-1); } while ((dirp = readdir(dp)) != NULL) { if (strcmp(dirp->d_name, ".") == 0 || strcmp(dirp->d_name, "..") == 0) { continue; } (void) sprintf(lpath, "%s%s", dir, dirp->d_name); if (is_symlink(lpath)) { /* * Fetch the name of the file the symlink refers to. */ n = readlink(lpath, rname, MAXNAMELEN); if (n <= 0) { if (debug >= 2) { (void) printf( "count_symlinks: can't read link " "%s\n", lpath); } continue; } rname[n] = '\0'; /* * If `rname' matches `name', bump the count. There * may well be multiple symlinks to the same name, so * we must continue to process the entire directory. */ if (strcmp(rname, name) == 0) { cnt++; } } } (void) closedir(dp); if (debug) { (void) printf("count_symlinks: found %d symlinks\n", cnt); } *count = cnt; return (0); } /* * Manage the cache of hostnames. An entry for each host that has recently * locked a file is kept. There is an in-ram table (record_table) and an empty * file in the file system name space (/var/statmon/sm/). This * routine adds (deletes) the name to (from) the in-ram table and the entry * to (from) the file system name space. * * If op == 1 then the name is added to the queue otherwise the name is * deleted. */ void record_name(char *name, int op) { name_entry *nl; int i; char path[MAXPATHLEN+MAXNAMELEN+SM_MAXPATHLEN]; name_entry **record_q; unsigned int hash; /* * These names are supposed to be just host names, not paths or * other arbitrary files. * manipulating the empty pathname unlinks CURRENT, * manipulating files with '/' would allow you to create and unlink * files all over the system; LOG_AUTH, it's a security thing. * Don't remove the directories . and .. */ if (name == NULL) return; if (name[0] == '\0' || strchr(name, '/') != NULL || strcmp(name, ".") == 0 || strcmp(name, "..") == 0) { syslog(LOG_ERR|LOG_AUTH, "statd: attempt to %s \"%s/%s\"", op == 1 ? "create" : "remove", CURRENT, name); return; } SMHASH(name, hash); if (debug) { if (op == 1) (void) printf("inserting %s at hash %d,\n", name, hash); else (void) printf("deleting %s at hash %d\n", name, hash); pr_name(name, 1); } if (op == 1) { /* insert */ mutex_lock(&record_table[hash].lock); record_q = &record_table[hash].sm_rechdp; if ((nl = find_name(record_q, name)) == NULL) { int path_len; if ((nl = insert_name(record_q, name, 1)) != (name_entry *) NULL) nl->count++; mutex_unlock(&record_table[hash].lock); /* make an entry in current directory */ path_len = strlen(CURRENT) + strlen(name) + 2; if (path_len > MAXPATHLEN) { syslog(LOG_ERR, "statd: pathname too long: %s/%s\n", CURRENT, name); return; } (void) strcpy(path, CURRENT); (void) strcat(path, "/"); (void) strcat(path, name); (void) create_file(path); if (debug) { (void) printf("After insert_name\n"); pr_name(name, 1); } /* make an entry in alternate paths */ for (i = 0; i < pathix; i++) { path_len = strlen(path_name[i]) + strlen("/statmon/sm/") + strlen(name) + 1; if (path_len > MAXPATHLEN) { syslog(LOG_ERR, "statd: pathname too " "long: %s/statmon/sm/%s\n", path_name[i], name); continue; } (void) strcpy(path, path_name[i]); (void) strcat(path, "/statmon/sm/"); (void) strcat(path, name); (void) create_file(path); } return; } nl->count++; mutex_unlock(&record_table[hash].lock); } else { /* delete */ mutex_lock(&record_table[hash].lock); record_q = &record_table[hash].sm_rechdp; if ((nl = find_name(record_q, name)) == NULL) { mutex_unlock(&record_table[hash].lock); return; } nl->count--; if (nl->count == 0) { delete_name(record_q, name); mutex_unlock(&record_table[hash].lock); /* remove this entry from current directory */ remove_name(name, 0, 0); } else mutex_unlock(&record_table[hash].lock); if (debug) { (void) printf("After delete_name \n"); pr_name(name, 1); } } } /* * This routine adds a symlink in the form of an ASCII dotted quad * IP address that is linked to the name already recorded in the * filesystem name space by record_name(). Enough information is * (hopefully) provided to support other address types in the future. * The purpose of this is to cache enough information to contact * hosts in other domains during server crash recovery (see bugid * 1184192). * * The worst failure mode here is that the symlink is not made, and * statd falls back to the old buggy behavior. */ void record_addr(char *name, sa_family_t family, struct netobj *ah) { int i; int path_len; char *famstr; struct in_addr addr; char *addr6; char ascii_addr[MAXNAMELEN]; char path[MAXPATHLEN]; if (family == AF_INET) { if (ah->n_len != sizeof (struct in_addr)) return; addr = *(struct in_addr *)ah->n_bytes; } else if (family == AF_INET6) { if (ah->n_len != sizeof (struct in6_addr)) return; addr6 = (char *)ah->n_bytes; } else return; if (debug) { if (family == AF_INET) (void) printf("record_addr: addr= %x\n", addr.s_addr); else if (family == AF_INET6) (void) printf("record_addr: addr= %x\n", ((struct in6_addr *)addr6)->s6_addr); } if (family == AF_INET) { if (addr.s_addr == INADDR_ANY || ((addr.s_addr && 0xff000000) == 0)) { syslog(LOG_DEBUG, "record_addr: illegal IP address %x\n", addr.s_addr); return; } } /* convert address to ASCII */ famstr = family2string(family); if (famstr == NULL) { syslog(LOG_DEBUG, "record_addr: unsupported address family %d\n", family); return; } switch (family) { char abuf[INET6_ADDRSTRLEN]; case AF_INET: (void) sprintf(ascii_addr, "%s.%s", famstr, inet_ntoa(addr)); break; case AF_INET6: (void) sprintf(ascii_addr, "%s.%s", famstr, inet_ntop(family, addr6, abuf, sizeof (abuf))); break; default: if (debug) { (void) printf( "record_addr: family2string supports unknown " "family %d (%s)\n", family, famstr); } free(famstr); return; } if (debug) { (void) printf("record_addr: ascii_addr= %s\n", ascii_addr); } free(famstr); /* * Make the symlink in CURRENT. The `name' file should have * been created previously by record_name(). */ (void) create_symlink(CURRENT, name, ascii_addr); /* * Similarly for alternate paths. */ for (i = 0; i < pathix; i++) { path_len = strlen(path_name[i]) + strlen("/statmon/sm/") + strlen(name) + 1; if (path_len > MAXPATHLEN) { syslog(LOG_ERR, "statd: pathname too long: %s/statmon/sm/%s\n", path_name[i], name); continue; } (void) strcpy(path, path_name[i]); (void) strcat(path, "/statmon/sm"); (void) create_symlink(path, name, ascii_addr); } } /* * SM_CRASH - simulate a crash of statd. */ void sm_crash(void) { name_entry *nl, *next; mon_entry *nl_monp, *mon_next; int k; my_id *nl_idp; for (k = 0; k < MAX_HASHSIZE; k++) { mutex_lock(&mon_table[k].lock); if ((mon_next = mon_table[k].sm_monhdp) == (mon_entry *) NULL) { mutex_unlock(&mon_table[k].lock); continue; } else { while ((nl_monp = mon_next) != NULL) { mon_next = mon_next->nxt; nl_idp = &nl_monp->id.mon_id.my_id; free(nl_monp->id.mon_id.mon_name); free(nl_idp->my_name); free(nl_monp); } mon_table[k].sm_monhdp = NULL; } mutex_unlock(&mon_table[k].lock); } /* Clean up entries in record table */ for (k = 0; k < MAX_HASHSIZE; k++) { mutex_lock(&record_table[k].lock); if ((next = record_table[k].sm_rechdp) == (name_entry *) NULL) { mutex_unlock(&record_table[k].lock); continue; } else { while ((nl = next) != NULL) { next = next->nxt; free(nl->name); free(nl); } record_table[k].sm_rechdp = NULL; } mutex_unlock(&record_table[k].lock); } /* Clean up entries in recovery table */ mutex_lock(&recov_q.lock); if ((next = recov_q.sm_recovhdp) != NULL) { while ((nl = next) != NULL) { next = next->nxt; free(nl->name); free(nl); } recov_q.sm_recovhdp = NULL; } mutex_unlock(&recov_q.lock); statd_init(); } /* * Initialize the hash tables: mon_table, record_table, recov_q and * locks. */ void sm_inithash(void) { int k; if (debug) (void) printf("Initializing hash tables\n"); for (k = 0; k < MAX_HASHSIZE; k++) { mon_table[k].sm_monhdp = NULL; record_table[k].sm_rechdp = NULL; mutex_init(&mon_table[k].lock, USYNC_THREAD, NULL); mutex_init(&record_table[k].lock, USYNC_THREAD, NULL); } mutex_init(&recov_q.lock, USYNC_THREAD, NULL); recov_q.sm_recovhdp = NULL; } /* * Maps a socket address family to a name string, or NULL if the family * is not supported by statd. * Caller is responsible for freeing storage used by result string, if any. */ static char * family2string(sa_family_t family) { char *rc; switch (family) { case AF_INET: rc = strdup(SM_ADDR_IPV4); break; case AF_INET6: rc = strdup(SM_ADDR_IPV6); break; default: rc = NULL; break; } return (rc); } /* * Prints out list in record_table if flag is 1 otherwise * prints out each list in recov_q specified by name. */ static void pr_name(char *name, int flag) { name_entry *nl; unsigned int hash; if (!debug) return; if (flag) { SMHASH(name, hash); (void) printf("*****record_q: "); mutex_lock(&record_table[hash].lock); nl = record_table[hash].sm_rechdp; while (nl != NULL) { (void) printf("(%x), ", (int)nl); nl = nl->nxt; } mutex_unlock(&record_table[hash].lock); } else { (void) printf("*****recovery_q: "); mutex_lock(&recov_q.lock); nl = recov_q.sm_recovhdp; while (nl != NULL) { (void) printf("(%x), ", (int)nl); nl = nl->nxt; } mutex_unlock(&recov_q.lock); } (void) printf("\n"); }