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/*
* support/nfs/nfssvc.c
*
* Run an NFS daemon.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <syslog.h>
#include "nfslib.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"
static void
nfssvc_setfds(int port, unsigned int ctlbits, char *haddr)
{
int fd, n, on=1;
char buf[BUFSIZ];
int udpfd = -1, tcpfd = -1;
struct sockaddr_in sin;
fd = open(NFSD_PORTS_FILE, O_RDONLY);
if (fd < 0)
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;
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = inet_addr(haddr);
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));
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));
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));
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));
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));
exit(1);
}
if (listen(tcpfd, 64) < 0){
syslog(LOG_ERR, "nfssvc: unable to create listening socket: "
"errno %d (%s)\n", errno, strerror(errno));
exit(1);
}
}
if (udpfd >= 0) {
snprintf(buf, BUFSIZ,"%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));
}
close(fd);
fd = -1;
}
if (tcpfd >= 0) {
if (fd < 0)
fd = open(NFSD_PORTS_FILE, O_WRONLY);
snprintf(buf, BUFSIZ,"%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));
}
}
close(fd);
return;
}
static void
nfssvc_versbits(unsigned int ctlbits)
{
int fd, n, off;
char buf[BUFSIZ], *ptr;
ptr = buf;
off = 0;
fd = open(NFSD_VERS_FILE, O_WRONLY);
if (fd < 0)
return;
for (n = NFSD_MINVERS; n <= NFSD_MAXVERS; n++) {
if (NFSCTL_VERISSET(ctlbits, n))
off += snprintf(ptr+off, BUFSIZ - off, "+%d ", n);
else
off += snprintf(ptr+off, BUFSIZ - off, "-%d ", 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));
}
close(fd);
return;
}
int
nfssvc(int port, int nrservs, unsigned int versbits, unsigned protobits,
char *haddr)
{
struct nfsctl_arg arg;
int fd;
/* Note: must set versions before fds so that
* the ports get registered with portmap against correct
* versions
*/
nfssvc_versbits(versbits);
nfssvc_setfds(port, protobits, haddr);
fd = open(NFSD_THREAD_FILE, O_WRONLY);
if (fd < 0)
fd = open("/proc/fs/nfs/threads", O_WRONLY);
if (fd >= 0) {
/* 2.5+ kernel with nfsd filesystem mounted.
* 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);
n = write(fd, buf, strlen(buf));
close(fd);
if (n != strlen(buf))
return -1;
else
return 0;
}
arg.ca_version = NFSCTL_VERSION;
arg.ca_svc.svc_nthreads = nrservs;
arg.ca_svc.svc_port = port;
return nfsctl(NFSCTL_SVC, &arg, NULL);
}
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