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-rw-r--r--utils/nfsd/nfssvc.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/utils/nfsd/nfssvc.c b/utils/nfsd/nfssvc.c
new file mode 100644
index 0000000..46452d9
--- /dev/null
+++ b/utils/nfsd/nfssvc.c
@@ -0,0 +1,438 @@
+/*
+ * utils/nfsd/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/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "nfslib.h"
+#include "xlog.h"
+#include "nfssvc.h"
+#include "version.h"
+
+#ifndef NFSD_FS_DIR
+#define NFSD_FS_DIR "/proc/fs/nfsd"
+#endif
+
+#define NFSD_PORTS_FILE NFSD_FS_DIR "/portlist"
+#define NFSD_VERS_FILE NFSD_FS_DIR "/versions"
+#define NFSD_THREAD_FILE NFSD_FS_DIR "/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];
+
+/*
+ * Using the "new" interfaces for nfsd requires that /proc/fs/nfsd is
+ * actually mounted. Make an attempt to mount it here if it doesn't appear
+ * to be.
+ */
+void
+nfssvc_mount_nfsdfs(char *progname)
+{
+ int err;
+ struct stat statbuf;
+
+ err = stat(NFSD_THREAD_FILE, &statbuf);
+ if (err == 0)
+ return;
+
+ if (errno != ENOENT) {
+ xlog(L_ERROR, "Unable to stat %s: errno %d (%m)",
+ NFSD_THREAD_FILE, errno);
+ return;
+ }
+
+ /*
+ * this call can return an error if modprobe is set up to automatically
+ * mount nfsdfs when nfsd.ko is plugged in. So, ignore the return
+ * code from it and just check for the "threads" file afterward.
+ */
+ err = system("/bin/mount -t nfsd nfsd " NFSD_FS_DIR " >/dev/null 2>&1");
+
+ err = stat(NFSD_THREAD_FILE, &statbuf);
+ if (err == 0)
+ return;
+
+ xlog(L_WARNING, "Unable to access " NFSD_FS_DIR " errno %d (%m)."
+ "\nPlease try, as root, 'mount -t nfsd nfsd " NFSD_FS_DIR
+ "' and then restart %s to correct the problem", errno, progname);
+
+ return;
+}
+
+/*
+ * 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 int
+nfssvc_setfds(const struct addrinfo *hints, const char *node, const char *port)
+{
+ int fd, on = 1, fac = L_ERROR;
+ int sockfd = -1, rc = 0, bounded = 0;
+ struct addrinfo *addrhead = NULL, *addr;
+ char *proto, *family;
+
+ /*
+ * if file can't be opened, fail.
+ */
+ fd = open(NFSD_PORTS_FILE, O_WRONLY);
+ if (fd < 0)
+ return 0;
+
+ rc = getaddrinfo(node, port, hints, &addrhead);
+ if (rc == EAI_NONAME && !strcmp(port, "nfs")) {
+ snprintf(buf, sizeof(buf), "%d", NFS_PORT);
+ rc = getaddrinfo(node, buf, hints, &addrhead);
+ }
+
+ if (rc != 0) {
+ xlog(L_ERROR, "unable to resolve %s:%s: %s",
+ node ? node : "ANYADDR", port,
+ rc == EAI_SYSTEM ? strerror(errno) :
+ gai_strerror(rc));
+ goto error;
+ }
+
+ addr = addrhead;
+ while(addr) {
+ /* skip non-TCP / non-UDP sockets */
+ switch(addr->ai_protocol) {
+ case IPPROTO_UDP:
+ proto = "UDP";
+ break;
+ case IPPROTO_TCP:
+ proto = "TCP";
+ break;
+ default:
+ addr = addr->ai_next;
+ continue;
+ }
+
+ switch(addr->ai_addr->sa_family) {
+ case AF_INET:
+ family = "AF_INET";
+ break;
+#ifdef IPV6_SUPPORTED
+ case AF_INET6:
+ family = "AF_INET6";
+ break;
+#endif /* IPV6_SUPPORTED */
+ default:
+ addr = addr->ai_next;
+ continue;
+ }
+
+ /* open socket and prepare to hand it off to kernel */
+ sockfd = socket(addr->ai_family, addr->ai_socktype,
+ addr->ai_protocol);
+ if (sockfd < 0) {
+ if (errno != EAFNOSUPPORT) {
+ xlog(L_ERROR, "unable to create %s %s socket: "
+ "errno %d (%m)", family, proto, errno);
+ rc = errno;
+ goto error;
+ }
+ addr = addr->ai_next;
+ continue;
+ }
+
+ xlog(D_GENERAL, "Created %s %s socket.", family, proto);
+
+#ifdef IPV6_SUPPORTED
+ if (addr->ai_family == AF_INET6 &&
+ setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on))) {
+ xlog(L_ERROR, "unable to set IPV6_V6ONLY: "
+ "errno %d (%m)\n", errno);
+ rc = errno;
+ goto error;
+ }
+#endif /* IPV6_SUPPORTED */
+ if (addr->ai_protocol == IPPROTO_TCP &&
+ setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) {
+ xlog(L_ERROR, "unable to set SO_REUSEADDR on %s "
+ "socket: errno %d (%m)", family, errno);
+ rc = errno;
+ goto error;
+ }
+ if (bind(sockfd, addr->ai_addr, addr->ai_addrlen)) {
+ xlog(L_ERROR, "unable to bind %s %s socket: "
+ "errno %d (%m)", family, proto, errno);
+ rc = errno;
+ goto error;
+ }
+ if (addr->ai_protocol == IPPROTO_TCP && listen(sockfd, 64)) {
+ xlog(L_ERROR, "unable to create listening socket: "
+ "errno %d (%m)", errno);
+ rc = errno;
+ goto error;
+ }
+
+ if (fd < 0)
+ fd = open(NFSD_PORTS_FILE, O_WRONLY);
+
+ if (fd < 0) {
+ xlog(L_ERROR, "couldn't open ports file: errno "
+ "%d (%m)", errno);
+ goto error;
+ }
+
+ snprintf(buf, sizeof(buf), "%d\n", sockfd);
+ if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
+ /*
+ * this error may be common on older kernels that don't
+ * support IPv6, so turn into a debug message.
+ */
+ if (errno == EAFNOSUPPORT)
+ fac = D_ALL;
+ xlog(fac, "writing fd to kernel failed: errno %d (%m)",
+ errno);
+ rc = errno;
+ goto error;
+ }
+ bounded++;
+
+ close(fd);
+ close(sockfd);
+ sockfd = fd = -1;
+ addr = addr->ai_next;
+ }
+error:
+ if (fd >= 0)
+ close(fd);
+ if (sockfd >= 0)
+ close(sockfd);
+ nfs_freeaddrinfo(addrhead);
+ return (bounded ? 0 : rc);
+}
+
+int
+nfssvc_set_sockets(const unsigned int protobits,
+ const char *host, const char *port)
+{
+ struct addrinfo hints = { .ai_flags = AI_PASSIVE };
+
+#ifdef IPV6_SUPPORTED
+ hints.ai_family = AF_UNSPEC;
+#else /* IPV6_SUPPORTED */
+ hints.ai_family = AF_INET;
+#endif /* IPV6_SUPPORTED */
+
+ if (!NFSCTL_ANYPROTO(protobits))
+ return EPROTOTYPE;
+ else if (!NFSCTL_UDPISSET(protobits))
+ hints.ai_protocol = IPPROTO_TCP;
+ else if (!NFSCTL_TCPISSET(protobits))
+ hints.ai_protocol = IPPROTO_UDP;
+
+ return nfssvc_setfds(&hints, host, port);
+}
+
+int
+nfssvc_set_rdmaport(const char *port)
+{
+ struct servent *sv = getservbyname(port, "tcp");
+ int nport;
+ char buf[20];
+ int ret;
+ int fd;
+
+ if (sv)
+ nport = ntohs(sv->s_port);
+ else {
+ char *ep;
+ nport = strtol(port, &ep, 10);
+ if (!*port || *ep) {
+ xlog(L_ERROR, "unable to interpret port name %s",
+ port);
+ return 1;
+ }
+ }
+
+ fd = open(NFSD_PORTS_FILE, O_WRONLY);
+ if (fd < 0)
+ return 1;
+ snprintf(buf, sizeof(buf), "rdma %d", nport);
+ ret = 0;
+ if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
+ ret= errno;
+ xlog(L_ERROR, "Unable to request RDMA services: %m");
+ }
+ close(fd);
+ return ret;
+}
+
+void
+nfssvc_set_time(const char *type, const int seconds)
+{
+ char pathbuf[40];
+ char nbuf[10];
+ int fd;
+
+ snprintf(pathbuf, sizeof(pathbuf), NFSD_FS_DIR "/nfsv4%stime", type);
+ snprintf(nbuf, sizeof(nbuf), "%d", seconds);
+ fd = open(pathbuf, O_WRONLY);
+ if (fd >= 0) {
+ if (write(fd, nbuf, strlen(nbuf)) != (ssize_t)strlen(nbuf))
+ xlog(L_ERROR, "Unable to set nfsv4%stime: %m", type);
+ close(fd);
+ }
+ if (strcmp(type, "grace") == 0) {
+ /* set same value for lockd */
+ fd = open("/proc/sys/fs/nfs/nlm_grace_period", O_WRONLY);
+ if (fd >= 0) {
+ if (write(fd, nbuf, strlen(nbuf)) != (ssize_t)strlen(nbuf))
+ xlog(L_ERROR, "Unable to write nlm_grace_period : %m");
+ close(fd);
+ }
+ }
+}
+
+void
+nfssvc_get_minormask(unsigned int *mask)
+{
+ int fd;
+ char *ptr = buf;
+ ssize_t size;
+
+ fd = open(NFSD_VERS_FILE, O_RDONLY);
+ if (fd < 0)
+ return;
+
+ size = read(fd, buf, sizeof(buf));
+ if (size < 0) {
+ xlog(L_ERROR, "Getting versions failed: errno %d (%m)", errno);
+ goto out;
+ }
+ ptr[size] = '\0';
+ for (;;) {
+ unsigned vers, minor = 0;
+ char *token = strtok(ptr, " ");
+
+ if (!token)
+ break;
+ ptr = NULL;
+ if (*token != '+' && *token != '-')
+ continue;
+ if (sscanf(++token, "%u.%u", &vers, &minor) > 0 &&
+ vers == 4 && minor <= NFS4_MAXMINOR)
+ NFSCTL_MINORSET(*mask, minor);
+ }
+out:
+ close(fd);
+ return;
+}
+
+static int
+nfssvc_print_vers(char *ptr, unsigned size, unsigned vers, unsigned minorvers,
+ int isset, int force4dot0)
+{
+ char sign = isset ? '+' : '-';
+ if (minorvers == 0)
+ if (linux_version_code() < MAKE_VERSION(4, 11, 0) || !force4dot0)
+ return snprintf(ptr, size, "%c%u ", sign, vers);
+ return snprintf(ptr, size, "%c%u.%u ", sign, vers, minorvers);
+}
+
+void
+nfssvc_setvers(unsigned int ctlbits, unsigned int minorvers, unsigned int minorversset,
+ int force4dot0)
+{
+ int fd, n, off;
+
+ off = 0;
+ fd = open(NFSD_VERS_FILE, O_WRONLY);
+ if (fd < 0)
+ return;
+
+ for (n = NFSD_MINVERS; n <= ((NFSD_MAXVERS < 3) ? NFSD_MAXVERS : 3); n++)
+ off += nfssvc_print_vers(&buf[off], sizeof(buf) - off,
+ n, 0, NFSCTL_VERISSET(ctlbits, n), 0);
+
+ for (n = 0; n <= NFS4_MAXMINOR; n++) {
+ if (!NFSCTL_MINORISSET(minorversset, n))
+ continue;
+ off += nfssvc_print_vers(&buf[off], sizeof(buf) - off,
+ 4, n, NFSCTL_MINORISSET(minorvers, n),
+ (n == 0) ? force4dot0 : 0);
+ }
+ if (!off--)
+ goto out;
+ buf[off] = '\0';
+ xlog(D_GENERAL, "Writing version string to kernel: %s", buf);
+ snprintf(&buf[off], sizeof(buf) - off, "\n");
+ if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
+ xlog(L_ERROR, "Setting version failed: errno %d (%m)", errno);
+out:
+ close(fd);
+
+ return;
+}
+
+int
+nfssvc_threads(const int nrservs)
+{
+ ssize_t n;
+ int fd;
+
+ 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 of threads.
+ */
+ snprintf(buf, sizeof(buf), "%d\n", nrservs);
+ n = write(fd, buf, strlen(buf));
+ close(fd);
+ if (n != (ssize_t)strlen(buf))
+ return -1;
+ else
+ return 0;
+ }
+ return -1;
+}
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