#include <config.h>
#endif
+#include <err.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <grp.h>
#include "xlog.h"
+#include "nsm.h"
+#include "nfsrpc.h"
-#ifndef BASEDIR
-# ifdef NFS_STATEDIR
-# define BASEDIR NFS_STATEDIR
-# else
-# define BASEDIR "/var/lib/nfs"
-# endif
-#endif
-
-#define DEFAULT_SM_STATE_PATH BASEDIR "/state"
-#define DEFAULT_SM_DIR_PATH BASEDIR "/sm"
-#define DEFAULT_SM_BAK_PATH DEFAULT_SM_DIR_PATH ".bak"
-
-char *_SM_BASE_PATH = BASEDIR;
-char *_SM_STATE_PATH = DEFAULT_SM_STATE_PATH;
-char *_SM_DIR_PATH = DEFAULT_SM_DIR_PATH;
-char *_SM_BAK_PATH = DEFAULT_SM_BAK_PATH;
-
-#define NSM_PROG 100024
-#define NSM_PROGRAM 100024
-#define NSM_VERSION 1
#define NSM_TIMEOUT 2
-#define NSM_NOTIFY 6
#define NSM_MAX_TIMEOUT 120 /* don't make this too big */
-#define MAXMSGSIZE 256
struct nsm_host {
struct nsm_host * next;
char * name;
- char * path;
- struct sockaddr_storage addr;
struct addrinfo *ai;
time_t last_used;
time_t send_next;
unsigned int timeout;
unsigned int retries;
- unsigned int xid;
+ uint32_t xid;
};
static char nsm_hostname[256];
-static uint32_t nsm_state;
+static int nsm_state;
+static int nsm_family = AF_INET;
static int opt_debug = 0;
-static int opt_update_state = 1;
+static _Bool opt_update_state = true;
static unsigned int opt_max_retry = 15 * 60;
static char * opt_srcaddr = 0;
static uint16_t opt_srcport = 0;
-static unsigned int nsm_get_state(int);
-static void notify(void);
+static void notify(const int sock);
static int notify_host(int, struct nsm_host *);
static void recv_reply(int);
-static void backup_hosts(const char *, const char *);
-static void get_hosts(const char *);
static void insert_host(struct nsm_host *);
static struct nsm_host *find_host(uint32_t);
static int record_pid(void);
-static void drop_privs(void);
-static void set_kernel_nsm_state(int state);
static struct nsm_host * hosts = NULL;
-/*
- * Address handling utilities
- */
-
-static unsigned short smn_get_port(const struct sockaddr *sap)
-{
- switch (sap->sa_family) {
- case AF_INET:
- return ntohs(((struct sockaddr_in *)sap)->sin_port);
- case AF_INET6:
- return ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
- }
- return 0;
-}
-
-static void smn_set_port(struct sockaddr *sap, const unsigned short port)
-{
- switch (sap->sa_family) {
- case AF_INET:
- ((struct sockaddr_in *)sap)->sin_port = htons(port);
- break;
- case AF_INET6:
- ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
- break;
- }
-}
-
static struct addrinfo *smn_lookup(const char *name)
{
struct addrinfo *ai, hint = {
return ai;
}
+__attribute_malloc__
+static struct nsm_host *
+smn_alloc_host(const char *hostname, const time_t timestamp)
+{
+ struct nsm_host *host;
+
+ host = calloc(1, sizeof(*host));
+ if (host == NULL)
+ goto out_nomem;
+
+ host->name = strdup(hostname);
+ if (host->name == NULL) {
+ free(host);
+ goto out_nomem;
+ }
+
+ host->last_used = timestamp;
+ host->timeout = NSM_TIMEOUT;
+ host->retries = 100; /* force address retry */
+
+ return host;
+
+out_nomem:
+ xlog_warn("Unable to allocate memory");
+ return NULL;
+}
+
static void smn_forget_host(struct nsm_host *host)
{
- unlink(host->path);
- free(host->path);
+ xlog(D_CALL, "Removing %s from notify list", host->name);
+
+ nsm_delete_notified_host(host->name);
+
free(host->name);
if (host->ai)
freeaddrinfo(host->ai);
free(host);
}
+static unsigned int
+smn_get_host(const char *hostname,
+ __attribute__ ((unused)) const struct sockaddr *sap,
+ __attribute__ ((unused)) const struct mon *m,
+ const time_t timestamp)
+{
+ struct nsm_host *host;
+
+ host = smn_alloc_host(hostname, timestamp);
+ if (host == NULL)
+ return 0;
+
+ insert_host(host);
+ xlog(D_GENERAL, "Added host %s to notify list", hostname);
+ return 1;
+}
+
+#ifdef IPV6_SUPPORTED
+static int smn_socket(void)
+{
+ int sock;
+
+ /*
+ * Use an AF_INET socket if IPv6 is disabled on the
+ * local system.
+ */
+ sock = socket(AF_INET6, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ if (errno != EAFNOSUPPORT) {
+ xlog(L_ERROR, "Failed to create RPC socket: %m");
+ return -1;
+ }
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock < 0) {
+ xlog(L_ERROR, "Failed to create RPC socket: %m");
+ return -1;
+ }
+ } else
+ nsm_family = AF_INET6;
+
+ if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) {
+ xlog(L_ERROR, "fcntl(3) on RPC socket failed: %m");
+ goto out_close;
+ }
+
+ /*
+ * TI-RPC over IPv6 (udp6/tcp6) does not handle IPv4. However,
+ * since sm-notify open-codes all of its RPC support, it can
+ * use a single socket and let the local network stack provide
+ * the correct mapping between address families automatically.
+ * This is the same thing that is done in the kernel.
+ */
+ if (nsm_family == AF_INET6) {
+ const int zero = 0;
+ socklen_t zerolen = (socklen_t)sizeof(zero);
+
+ if (setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
+ (char *)&zero, zerolen) == -1) {
+ xlog(L_ERROR, "setsockopt(3) on RPC socket failed: %m");
+ goto out_close;
+ }
+ }
+
+ return sock;
+
+out_close:
+ (void)close(sock);
+ return -1;
+}
+#else /* !IPV6_SUPPORTED */
+static int smn_socket(void)
+{
+ int sock;
+
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ xlog(L_ERROR, "Failed to create RPC socket: %m");
+ return -1;
+ }
+
+ if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) {
+ xlog(L_ERROR, "fcntl(3) on RPC socket failed: %m");
+ (void)close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+#endif /* !IPV6_SUPPORTED */
+
+#ifdef HAVE_LIBTIRPC
+static int
+smn_bindresvport(int sock, struct sockaddr *sap)
+{
+ return bindresvport_sa(sock, sap);
+}
+
+#else /* !HAVE_LIBTIRPC */
+static int
+smn_bindresvport(int sock, struct sockaddr *sap)
+{
+ if (sap->sa_family != AF_INET) {
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+
+ return bindresvport(sock, (struct sockaddr_in *)(char *)sap);
+}
+#endif /* !HAVE_LIBTIRPC */
+
+/*
+ * Prepare a socket for sending RPC requests
+ *
+ * Returns a bound datagram socket file descriptor, or -1 if
+ * an error occurs.
+ */
+static int
+smn_create_socket(const char *srcaddr, const uint16_t srcport)
+{
+ struct sockaddr_storage address;
+ struct sockaddr *local_addr = (struct sockaddr *)&address;
+ int sock, retry_cnt = 0;
+
+retry:
+ sock = smn_socket();
+ if (sock == -1)
+ return -1;
+
+ memset(&address, 0, sizeof(address));
+ local_addr->sa_family = AF_INET; /* Default to IPv4 */
+
+ /* Bind source IP if provided on command line */
+ if (srcaddr) {
+ struct addrinfo *ai = smn_lookup(srcaddr);
+ if (!ai) {
+ xlog(L_ERROR,
+ "Not a valid hostname or address: \"%s\"",
+ srcaddr);
+ (void)close(sock);
+ return -1;
+ }
+
+ /* We know it's IPv4 at this point */
+ memcpy(local_addr, ai->ai_addr, ai->ai_addrlen);
+
+ freeaddrinfo(ai);
+ }
+
+ /* Use source port if provided on the command line,
+ * otherwise use bindresvport */
+ if (srcport) {
+ nfs_set_port(local_addr, srcport);
+ if (bind(sock, local_addr, sizeof(struct sockaddr_in)) < 0) {
+ xlog(L_ERROR, "Failed to bind RPC socket: %m");
+ (void)close(sock);
+ return -1;
+ }
+ } else {
+ struct servent *se;
+ struct sockaddr_in *sin = (struct sockaddr_in *)local_addr;
+
+ if (smn_bindresvport(sock, local_addr) == -1) {
+ xlog(L_ERROR,
+ "bindresvport on RPC socket failed: %m");
+ (void)close(sock);
+ return -1;
+ }
+
+ /* try to avoid known ports */
+ se = getservbyport(sin->sin_port, "udp");
+ if (se && retry_cnt < 100) {
+ retry_cnt++;
+ close(sock);
+ goto retry;
+ }
+ }
+
+ return sock;
+}
+
int
main(int argc, char **argv)
{
- int c;
- int force = 0;
+ int c, sock, force = 0;
char * progname;
progname = strrchr(argv[0], '/');
opt_max_retry = atoi(optarg) * 60;
break;
case 'n':
- opt_update_state = 0;
+ opt_update_state = false;
break;
case 'p':
opt_srcport = atoi(optarg);
opt_srcaddr = optarg;
break;
case 'P':
- _SM_BASE_PATH = strdup(optarg);
- _SM_STATE_PATH = malloc(strlen(optarg)+1+sizeof("state"));
- _SM_DIR_PATH = malloc(strlen(optarg)+1+sizeof("sm"));
- _SM_BAK_PATH = malloc(strlen(optarg)+1+sizeof("sm.bak"));
- if (_SM_BASE_PATH == NULL ||
- _SM_STATE_PATH == NULL ||
- _SM_DIR_PATH == NULL ||
- _SM_BAK_PATH == NULL) {
- fprintf(stderr, "unable to allocate memory");
+ if (!nsm_setup_pathnames(argv[0], optarg))
exit(1);
- }
- strcat(strcpy(_SM_STATE_PATH, _SM_BASE_PATH), "/state");
- strcat(strcpy(_SM_DIR_PATH, _SM_BASE_PATH), "/sm");
- strcat(strcpy(_SM_BAK_PATH, _SM_BASE_PATH), "/sm.bak");
break;
default:
xlog_open(progname);
xlog(L_NOTICE, "Version " VERSION " starting");
- if (strcmp(_SM_BASE_PATH, BASEDIR) == 0) {
- if (record_pid() == 0 && force == 0 && opt_update_state == 1) {
+ if (nsm_is_default_parentdir()) {
+ if (record_pid() == 0 && force == 0 && opt_update_state) {
/* already run, don't try again */
xlog(L_NOTICE, "Already notifying clients; Exiting!");
exit(0);
exit(1);
}
- backup_hosts(_SM_DIR_PATH, _SM_BAK_PATH);
- get_hosts(_SM_BAK_PATH);
-
- /* If there are not hosts to notify, just exit */
- if (!hosts) {
+ (void)nsm_retire_monitored_hosts();
+ if (nsm_load_notify_list(smn_get_host) == 0) {
xlog(D_GENERAL, "No hosts to notify; exiting");
return 0;
}
- /* Get and update the NSM state. This will call sync() */
nsm_state = nsm_get_state(opt_update_state);
- set_kernel_nsm_state(nsm_state);
+ if (nsm_state == 0)
+ exit(1);
+ nsm_update_kernel_state(nsm_state);
if (!opt_debug) {
xlog(L_NOTICE, "Backgrounding to notify hosts...\n");
close(2);
}
- notify();
+ sock = smn_create_socket(opt_srcaddr, opt_srcport);
+ if (sock == -1)
+ exit(1);
+
+ if (!nsm_drop_privileges(-1))
+ exit(1);
+
+ notify(sock);
if (hosts) {
struct nsm_host *hp;
* Notify hosts
*/
static void
-notify(void)
+notify(const int sock)
{
- struct sockaddr_storage address;
- struct sockaddr *local_addr = (struct sockaddr *)&address;
time_t failtime = 0;
- int sock = -1;
- int retry_cnt = 0;
-
- retry:
- sock = socket(AF_INET, SOCK_DGRAM, 0);
- if (sock < 0) {
- xlog(L_ERROR, "Failed to create RPC socket: %m");
- exit(1);
- }
- fcntl(sock, F_SETFL, O_NONBLOCK);
-
- memset(&address, 0, sizeof(address));
- local_addr->sa_family = AF_INET; /* Default to IPv4 */
-
- /* Bind source IP if provided on command line */
- if (opt_srcaddr) {
- struct addrinfo *ai = smn_lookup(opt_srcaddr);
- if (!ai) {
- xlog(L_ERROR,
- "Not a valid hostname or address: \"%s\"",
- opt_srcaddr);
- exit(1);
- }
-
- /* We know it's IPv4 at this point */
- memcpy(local_addr, ai->ai_addr, ai->ai_addrlen);
-
- freeaddrinfo(ai);
- }
-
- /* Use source port if provided on the command line,
- * otherwise use bindresvport */
- if (opt_srcport) {
- smn_set_port(local_addr, opt_srcport);
- if (bind(sock, local_addr, sizeof(struct sockaddr_in)) < 0) {
- xlog(L_ERROR, "Failed to bind RPC socket: %m");
- exit(1);
- }
- } else {
- struct servent *se;
- struct sockaddr_in *sin = (struct sockaddr_in *)local_addr;
- (void) bindresvport(sock, sin);
- /* try to avoid known ports */
- se = getservbyport(sin->sin_port, "udp");
- if (se && retry_cnt < 100) {
- retry_cnt++;
- close(sock);
- goto retry;
- }
- }
if (opt_max_retry)
failtime = time(NULL) + opt_max_retry;
- drop_privs();
-
while (hosts) {
struct pollfd pfd;
time_t now = time(NULL);
static int
notify_host(int sock, struct nsm_host *host)
{
- struct sockaddr_storage address;
- struct sockaddr *dest = (struct sockaddr *)&address;
- socklen_t destlen = sizeof(address);
- static unsigned int xid = 0;
- uint32_t msgbuf[MAXMSGSIZE], *p;
- unsigned int len;
-
- if (!xid)
- xid = getpid() + time(NULL);
- if (!host->xid)
- host->xid = xid++;
+ struct sockaddr *sap;
+ socklen_t salen;
if (host->ai == NULL) {
host->ai = smn_lookup(host->name);
}
}
- memset(msgbuf, 0, sizeof(msgbuf));
- p = msgbuf;
- *p++ = htonl(host->xid);
- *p++ = 0;
- *p++ = htonl(2);
-
/* If we retransmitted 4 times, reset the port to force
* a new portmap lookup (in case statd was restarted).
* We also rotate through multiple IP addresses at this
*/
if (host->retries >= 4) {
/* don't rotate if there is only one addrinfo */
- if (host->ai->ai_next == NULL)
- memcpy(&host->addr, host->ai->ai_addr,
- host->ai->ai_addrlen);
- else {
+ if (host->ai->ai_next != NULL) {
struct addrinfo *first = host->ai;
struct addrinfo **next = &host->ai;
next = & (*next)->ai_next;
/* put first entry at end */
*next = first;
- memcpy(&host->addr, first->ai_addr,
- first->ai_addrlen);
}
- smn_set_port((struct sockaddr *)&host->addr, 0);
+ nfs_set_port(host->ai->ai_addr, 0);
host->retries = 0;
}
- memcpy(dest, &host->addr, destlen);
- if (smn_get_port(dest) == 0) {
- /* Build a PMAP packet */
- xlog(D_GENERAL, "Sending portmap query to %s", host->name);
+ sap = host->ai->ai_addr;
+ salen = host->ai->ai_addrlen;
- smn_set_port(dest, 111);
- *p++ = htonl(100000);
- *p++ = htonl(2);
- *p++ = htonl(3);
-
- /* Auth and verf */
- *p++ = 0; *p++ = 0;
- *p++ = 0; *p++ = 0;
-
- *p++ = htonl(NSM_PROGRAM);
- *p++ = htonl(NSM_VERSION);
- *p++ = htonl(IPPROTO_UDP);
- *p++ = 0;
- } else {
- /* Build an SM_NOTIFY packet */
- xlog(D_GENERAL, "Sending SM_NOTIFY to %s", host->name);
-
- *p++ = htonl(NSM_PROGRAM);
- *p++ = htonl(NSM_VERSION);
- *p++ = htonl(NSM_NOTIFY);
-
- /* Auth and verf */
- *p++ = 0; *p++ = 0;
- *p++ = 0; *p++ = 0;
-
- /* state change */
- len = strlen(nsm_hostname);
- *p++ = htonl(len);
- memcpy(p, nsm_hostname, len);
- p += (len + 3) >> 2;
- *p++ = htonl(nsm_state);
- }
- len = (p - msgbuf) << 2;
-
- if (sendto(sock, msgbuf, len, 0, dest, destlen) < 0)
- xlog_warn("Sending Reboot Notification to "
- "'%s' failed: errno %d (%m)", host->name, errno);
+ if (nfs_get_port(sap) == 0)
+ host->xid = nsm_xmit_rpcbind(sock, sap, SM_PROG, SM_VERS);
+ else
+ host->xid = nsm_xmit_notify(sock, sap, salen,
+ SM_PROG, nsm_hostname, nsm_state);
return 0;
}
/*
- * Receive reply from remote host
+ * Extract the returned port number and set up the SM_NOTIFY call.
*/
static void
-recv_reply(int sock)
+recv_rpcbind_reply(struct sockaddr *sap, struct nsm_host *host, XDR *xdr)
{
- struct nsm_host *hp;
- struct sockaddr *sap;
- uint32_t msgbuf[MAXMSGSIZE], *p, *end;
- uint32_t xid;
- int res;
-
- res = recv(sock, msgbuf, sizeof(msgbuf), 0);
- if (res < 0)
- return;
-
- xlog(D_GENERAL, "Received packet...");
-
- p = msgbuf;
- end = p + (res >> 2);
+ uint16_t port = nsm_recv_rpcbind(sap->sa_family, xdr);
- xid = ntohl(*p++);
- if (*p++ != htonl(1) /* must be REPLY */
- || *p++ != htonl(0) /* must be ACCEPTED */
- || *p++ != htonl(0) /* must be NULL verifier */
- || *p++ != htonl(0)
- || *p++ != htonl(0)) /* must be SUCCESS */
- return;
+ host->send_next = time(NULL);
+ host->xid = 0;
- /* Before we look at the data, find the host struct for
- this reply */
- if ((hp = find_host(xid)) == NULL)
- return;
- sap = (struct sockaddr *)&hp->addr;
-
- if (smn_get_port(sap) == 0) {
- /* This was a portmap request */
- unsigned int port;
-
- port = ntohl(*p++);
- if (p > end)
- goto fail;
-
- hp->send_next = time(NULL);
- if (port == 0) {
- /* No binding for statd. Delay the next
- * portmap query for max timeout */
- xlog(D_GENERAL, "No statd on %s", hp->name);
- hp->timeout = NSM_MAX_TIMEOUT;
- hp->send_next += NSM_MAX_TIMEOUT;
- } else {
- smn_set_port(sap, port);
- if (hp->timeout >= NSM_MAX_TIMEOUT / 4)
- hp->timeout = NSM_MAX_TIMEOUT / 4;
- }
- hp->xid = 0;
+ if (port == 0) {
+ /* No binding for statd... */
+ xlog(D_GENERAL, "No statd on host %s", host->name);
+ host->timeout = NSM_MAX_TIMEOUT;
+ host->send_next += NSM_MAX_TIMEOUT;
} else {
- /* Successful NOTIFY call. Server returns void,
- * so nothing we need to do here (except
- * check that we didn't read past the end of the
- * packet)
- */
- if (p <= end) {
- xlog(D_GENERAL, "Host %s notified successfully",
- hp->name);
- smn_forget_host(hp);
- return;
- }
+ nfs_set_port(sap, port);
+ if (host->timeout >= NSM_MAX_TIMEOUT / 4)
+ host->timeout = NSM_MAX_TIMEOUT / 4;
}
-fail: /* Re-insert the host */
- insert_host(hp);
+ insert_host(host);
}
/*
- * Back up all hosts from the sm directory to sm.bak
+ * Successful NOTIFY call. Server returns void, so nothing
+ * we need to do here.
*/
static void
-backup_hosts(const char *dirname, const char *bakname)
+recv_notify_reply(struct nsm_host *host)
{
- struct dirent *de;
- DIR *dir;
-
- if (!(dir = opendir(dirname))) {
- xlog_warn("Failed to open %s: %m", dirname);
- return;
- }
-
- while ((de = readdir(dir)) != NULL) {
- char src[1024], dst[1024];
+ xlog(D_GENERAL, "Host %s notified successfully", host->name);
- if (de->d_name[0] == '.')
- continue;
-
- snprintf(src, sizeof(src), "%s/%s", dirname, de->d_name);
- snprintf(dst, sizeof(dst), "%s/%s", bakname, de->d_name);
- if (rename(src, dst) < 0)
- xlog_warn("Failed to rename %s -> %s: %m", src, dst);
- }
- closedir(dir);
+ smn_forget_host(host);
}
/*
- * Get all entries from sm.bak and convert them to host entries
+ * Receive reply from remote host
*/
static void
-get_hosts(const char *dirname)
+recv_reply(int sock)
{
- struct nsm_host *host;
- struct dirent *de;
- DIR *dir;
+ struct nsm_host *hp;
+ struct sockaddr *sap;
+ char msgbuf[NSM_MAXMSGSIZE];
+ uint32_t xid;
+ ssize_t msglen;
+ XDR xdr;
- if (!(dir = opendir(dirname))) {
- xlog_warn("Failed to open %s: %m", dirname);
+ memset(msgbuf, 0 , sizeof(msgbuf));
+ msglen = recv(sock, msgbuf, sizeof(msgbuf), 0);
+ if (msglen < 0)
return;
- }
- host = NULL;
- while ((de = readdir(dir)) != NULL) {
- struct stat stb;
- char path[1024];
-
- if (de->d_name[0] == '.')
- continue;
- if (host == NULL)
- host = calloc(1, sizeof(*host));
- if (host == NULL) {
- xlog_warn("Unable to allocate memory");
- return;
- }
+ xlog(D_GENERAL, "Received packet...");
- snprintf(path, sizeof(path), "%s/%s", dirname, de->d_name);
- if (stat(path, &stb) < 0)
- continue;
+ memset(&xdr, 0, sizeof(xdr));
+ xdrmem_create(&xdr, msgbuf, (unsigned int)msglen, XDR_DECODE);
+ xid = nsm_parse_reply(&xdr);
+ if (xid == 0)
+ goto out;
- host->last_used = stb.st_mtime;
- host->timeout = NSM_TIMEOUT;
- host->path = strdup(path);
- host->name = strdup(de->d_name);
- host->retries = 100; /* force address retry */
+ /* Before we look at the data, find the host struct for
+ this reply */
+ if ((hp = find_host(xid)) == NULL)
+ goto out;
- insert_host(host);
- host = NULL;
- }
- closedir(dir);
+ sap = hp->ai->ai_addr;
+ if (nfs_get_port(sap) == 0)
+ recv_rpcbind_reply(sap, hp, &xdr);
+ else
+ recv_notify_reply(hp);
- if (host)
- free(host);
+out:
+ xdr_destroy(&xdr);
}
/*
return NULL;
}
-
-/*
- * Retrieve the current NSM state
- */
-static unsigned int
-nsm_get_state(int update)
-{
- char newfile[PATH_MAX];
- int fd, state;
-
- if ((fd = open(_SM_STATE_PATH, O_RDONLY)) < 0) {
- xlog_warn("%s: %m", _SM_STATE_PATH);
- xlog_warn("Creating %s, set initial state 1",
- _SM_STATE_PATH);
- state = 1;
- update = 1;
- } else {
- if (read(fd, &state, sizeof(state)) != sizeof(state)) {
- xlog_warn("%s: bad file size, setting state = 1",
- _SM_STATE_PATH);
- state = 1;
- update = 1;
- } else {
- if (!(state & 1))
- state += 1;
- }
- close(fd);
- }
-
- if (update) {
- state += 2;
- snprintf(newfile, sizeof(newfile),
- "%s.new", _SM_STATE_PATH);
- if ((fd = open(newfile, O_CREAT|O_WRONLY, 0644)) < 0) {
- xlog(L_ERROR, "Cannot create %s: %m", newfile);
- exit(1);
- }
- if (write(fd, &state, sizeof(state)) != sizeof(state)) {
- xlog(L_ERROR,
- "Failed to write state to %s", newfile);
- exit(1);
- }
- close(fd);
- if (rename(newfile, _SM_STATE_PATH) < 0) {
- xlog(L_ERROR,
- "Cannot create %s: %m", _SM_STATE_PATH);
- exit(1);
- }
- sync();
- }
-
- return state;
-}
-
/*
* Record pid in /var/run/sm-notify.pid
* This file should remain until a reboot, even if the
(void)close(fd);
return 1;
}
-
-/* Drop privileges to match owner of state-directory
- * (in case a reply triggers some unknown bug).
- */
-static void drop_privs(void)
-{
- struct stat st;
-
- if (stat(_SM_DIR_PATH, &st) == -1 &&
- stat(_SM_BASE_PATH, &st) == -1) {
- st.st_uid = 0;
- st.st_gid = 0;
- }
-
- if (st.st_uid == 0) {
- xlog_warn("Running as 'root'. "
- "chown %s to choose different user", _SM_DIR_PATH);
- return;
- }
-
- setgroups(0, NULL);
- if (setgid(st.st_gid) == -1
- || setuid(st.st_uid) == -1) {
- xlog(L_ERROR, "Fail to drop privileges");
- exit(1);
- }
-}
-
-static void set_kernel_nsm_state(int state)
-{
- int fd;
- const char *file = "/proc/sys/fs/nfs/nsm_local_state";
-
- fd = open(file ,O_WRONLY);
- if (fd >= 0) {
- char buf[20];
- snprintf(buf, sizeof(buf), "%d", state);
- if (write(fd, buf, strlen(buf)) != strlen(buf)) {
- xlog_warn("Writing to '%s' failed: errno %d (%m)",
- file, errno);
- }
- close(fd);
- }
-}
projects / nfs-utils.git / blobdiff