#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
-#include <syslog.h>
-
#include "nfslib.h"
+#include "xlog.h"
#define NFSD_PORTS_FILE "/proc/fs/nfsd/portlist"
#define NFSD_VERS_FILE "/proc/fs/nfsd/versions"
#define NFSD_THREAD_FILE "/proc/fs/nfsd/threads"
+/*
+ * declaring a common static scratch buffer here keeps us from having to
+ * continually thrash the stack. The value of 128 bytes here is really just a
+ * SWAG and can be increased if necessary. It ought to be enough for the
+ * routines below however.
+ */
+char buf[128];
+
+/*
+ * Are there already sockets configured? If not, then it is safe to try to
+ * open some and pass them through.
+ *
+ * Note: If the user explicitly asked for 'udp', then we should probably check
+ * if that is open, and should open it if not. However we don't yet. All
+ * sockets have to be opened when the first daemon is started.
+ */
+int
+nfssvc_inuse(void)
+{
+ int fd, n;
+
+ fd = open(NFSD_PORTS_FILE, O_RDONLY);
+
+ /* problem opening file, assume that nothing is configured */
+ if (fd < 0)
+ return 0;
+
+ n = read(fd, buf, sizeof(buf));
+ close(fd);
+
+ xlog(D_GENERAL, "knfsd is currently %s", (n > 0) ? "up" : "down");
+
+ return (n > 0);
+}
+
static void
nfssvc_setfds(int port, unsigned int ctlbits, char *haddr)
{
- int fd, n, on=1;
- char buf[BUFSIZ];
+ int fd, on=1;
int udpfd = -1, tcpfd = -1;
struct sockaddr_in sin;
- fd = open(NFSD_PORTS_FILE, O_RDONLY);
- if (fd < 0)
+ if (nfssvc_inuse())
return;
- n = read(fd, buf, BUFSIZ);
- close(fd);
- if (n != 0)
- return;
- /* there are no ports currently open, so it is safe to
- * try to open some and pass them through.
- * Note: If the user explicitly asked for 'udp', then
- * we should probably check if that is open, and should
- * open it if not. However we don't yet. All sockets
- * have to be opened when the first daemon is started.
- */
+
fd = open(NFSD_PORTS_FILE, O_WRONLY);
if (fd < 0)
return;
if (NFSCTL_UDPISSET(ctlbits)) {
udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (udpfd < 0) {
- syslog(LOG_ERR, "nfssvc: unable to create UPD socket: "
- "errno %d (%s)\n", errno, strerror(errno));
+ xlog(L_ERROR, "unable to create UDP socket: "
+ "errno %d (%m)", errno);
exit(1);
}
if (bind(udpfd, (struct sockaddr *)&sin, sizeof(sin)) < 0){
- syslog(LOG_ERR, "nfssvc: unable to bind UPD socket: "
- "errno %d (%s)\n", errno, strerror(errno));
+ xlog(L_ERROR, "unable to bind UDP socket: "
+ "errno %d (%m)", errno);
exit(1);
}
}
if (NFSCTL_TCPISSET(ctlbits)) {
tcpfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (tcpfd < 0) {
- syslog(LOG_ERR, "nfssvc: unable to createt tcp socket: "
- "errno %d (%s)\n", errno, strerror(errno));
+ xlog(L_ERROR, "unable to create TCP socket: "
+ "errno %d (%m)", errno);
exit(1);
}
if (setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) {
- syslog(LOG_ERR, "nfssvc: unable to set SO_REUSEADDR: "
- "errno %d (%s)\n", errno, strerror(errno));
+ xlog(L_ERROR, "unable to set SO_REUSEADDR: "
+ "errno %d (%m)", errno);
exit(1);
}
if (bind(tcpfd, (struct sockaddr *)&sin, sizeof(sin)) < 0){
- syslog(LOG_ERR, "nfssvc: unable to bind TCP socket: "
- "errno %d (%s)\n", errno, strerror(errno));
+ xlog(L_ERROR, "unable to bind TCP socket: "
+ "errno %d (%m)", errno);
exit(1);
}
if (listen(tcpfd, 64) < 0){
- syslog(LOG_ERR, "nfssvc: unable to create listening socket: "
- "errno %d (%s)\n", errno, strerror(errno));
+ xlog(L_ERROR, "unable to create listening socket: "
+ "errno %d (%m)", errno);
exit(1);
}
}
if (udpfd >= 0) {
- snprintf(buf, BUFSIZ,"%d\n", udpfd);
+ snprintf(buf, sizeof(buf), "%d\n", udpfd);
if (write(fd, buf, strlen(buf)) != strlen(buf)) {
- syslog(LOG_ERR,
- "nfssvc: writing fds to kernel failed: errno %d (%s)",
- errno, strerror(errno));
+ xlog(L_ERROR,
+ "writing fds to kernel failed: errno %d (%m)",
+ errno);
}
close(fd);
fd = -1;
if (tcpfd >= 0) {
if (fd < 0)
fd = open(NFSD_PORTS_FILE, O_WRONLY);
- snprintf(buf, BUFSIZ,"%d\n", tcpfd);
+ snprintf(buf, sizeof(buf), "%d\n", tcpfd);
if (write(fd, buf, strlen(buf)) != strlen(buf)) {
- syslog(LOG_ERR,
- "nfssvc: writing fds to kernel failed: errno %d (%s)",
- errno, strerror(errno));
+ xlog(L_ERROR,
+ "writing fds to kernel failed: errno %d (%m)",
+ errno);
}
}
close(fd);
nfssvc_versbits(unsigned int ctlbits, int minorvers4)
{
int fd, n, off;
- char buf[BUFSIZ], *ptr;
+ char *ptr;
ptr = buf;
off = 0;
for (n = NFSD_MINVERS; n <= NFSD_MAXVERS; n++) {
if (NFSCTL_VERISSET(ctlbits, n))
- off += snprintf(ptr+off, BUFSIZ - off, "+%d ", n);
+ off += snprintf(ptr+off, sizeof(buf) - off, "+%d ", n);
else
- off += snprintf(ptr+off, BUFSIZ - off, "-%d ", n);
+ off += snprintf(ptr+off, sizeof(buf) - off, "-%d ", n);
}
n = minorvers4 >= 0 ? minorvers4 : -minorvers4;
if (n >= NFSD_MINMINORVERS4 && n <= NFSD_MAXMINORVERS4)
- off += snprintf(ptr+off, BUFSIZ - off, "%c4.%d",
+ off += snprintf(ptr+off, sizeof(buf) - off, "%c4.%d",
minorvers4 > 0 ? '+' : '-',
n);
- snprintf(ptr+off, BUFSIZ - off, "\n");
- if (write(fd, buf, strlen(buf)) != strlen(buf)) {
- syslog(LOG_ERR, "nfssvc: Setting version failed: errno %d (%s)",
- errno, strerror(errno));
- }
+ xlog(D_GENERAL, "Writing version string to kernel: %s", buf);
+ snprintf(ptr+off, sizeof(buf) - off, "\n");
+ if (write(fd, buf, strlen(buf)) != strlen(buf))
+ xlog(L_ERROR, "Setting version failed: errno %d (%m)", errno);
+
close(fd);
return;
* Just write the number in.
* Cannot handle port number yet, but does anyone care?
*/
- char buf[20];
int n;
- snprintf(buf, 20,"%d\n", nrservs);
+ snprintf(buf, sizeof(buf), "%d\n", nrservs);
n = write(fd, buf, strlen(buf));
close(fd);
if (n != strlen(buf))
projects / nfs-utils.git / blobdiff