#include <config.h>
#endif
+#include <sys/types.h>
#include <sys/socket.h>
+#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include "nfslib.h"
#include "xlog.h"
+/*
+ * IPv6 support for nfsd was finished before some of the other daemons (mountd
+ * and statd in particular). That could be a problem in the future if someone
+ * were to boot a kernel that supports IPv6 serving with an older nfs-utils. For
+ * now, hardcode the IPv6 switch into the off position until the other daemons
+ * are functional.
+ */
+#undef IPV6_SUPPORTED
+
#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)
+/*
+ * 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, on=1;
- char buf[BUFSIZ];
- int udpfd = -1, tcpfd = -1;
- struct sockaddr_in sin;
+ int fd, n;
fd = open(NFSD_PORTS_FILE, O_RDONLY);
+
+ /* problem opening file, assume that nothing is configured */
if (fd < 0)
- return;
- n = read(fd, buf, BUFSIZ);
+ return 0;
+
+ n = read(fd, buf, sizeof(buf));
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.
- */
+
+ 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;
+ struct addrinfo *addrhead = NULL, *addr;
+ char *proto, *family;
+
+ /*
+ * if file can't be opened, then assume that it's not available and
+ * that the caller should just fall back to the old nfsctl interface
+ */
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) {
- xlog(L_ERROR, "unable to create UDP socket: "
- "errno %d (%m)", errno);
- exit(1);
- }
- if (bind(udpfd, (struct sockaddr *)&sin, sizeof(sin)) < 0){
- xlog(L_ERROR, "unable to bind UDP socket: "
- "errno %d (%m)", errno);
- exit(1);
- }
+ return 0;
+
+ switch(hints->ai_family) {
+ case AF_INET:
+ family = "inet";
+ break;
+#ifdef IPV6_SUPPORTED
+ case AF_INET6:
+ family = "inet6";
+ break;
+#endif /* IPV6_SUPPORTED */
+ default:
+ xlog(L_ERROR, "Unknown address family specified: %d\n",
+ hints->ai_family);
+ rc = EAFNOSUPPORT;
+ goto error;
}
- if (NFSCTL_TCPISSET(ctlbits)) {
- tcpfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if (tcpfd < 0) {
- xlog(L_ERROR, "unable to create TCP socket: "
- "errno %d (%m)", errno);
- exit(1);
+ 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 to %s address: "
+ "%s", node ? node : "ANYADDR", port, family,
+ 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;
}
- if (setsockopt(tcpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) {
- xlog(L_ERROR, "unable to set SO_REUSEADDR: "
- "errno %d (%m)", errno);
- exit(1);
+
+ xlog(D_GENERAL, "Creating %s %s socket.", family, proto);
+
+ /* open socket and prepare to hand it off to kernel */
+ sockfd = socket(addr->ai_family, addr->ai_socktype,
+ addr->ai_protocol);
+ if (sockfd < 0) {
+ xlog(L_ERROR, "unable to create %s %s socket: "
+ "errno %d (%m)", family, proto, errno);
+ rc = errno;
+ goto error;
}
- if (bind(tcpfd, (struct sockaddr *)&sin, sizeof(sin)) < 0){
- xlog(L_ERROR, "unable to bind TCP socket: "
- "errno %d (%m)", errno);
- exit(1);
+#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;
}
- if (listen(tcpfd, 64) < 0){
+#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);
- exit(1);
- }
- }
- if (udpfd >= 0) {
- snprintf(buf, BUFSIZ,"%d\n", udpfd);
- if (write(fd, buf, strlen(buf)) != strlen(buf)) {
- xlog(L_ERROR,
- "writing fds to kernel failed: errno %d (%m)",
- errno);
+ rc = errno;
+ goto error;
}
- close(fd);
- fd = -1;
- }
- if (tcpfd >= 0) {
+
if (fd < 0)
fd = open(NFSD_PORTS_FILE, O_WRONLY);
- snprintf(buf, BUFSIZ,"%d\n", tcpfd);
+
+ 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)) != strlen(buf)) {
- xlog(L_ERROR,
- "writing fds to kernel failed: errno %d (%m)",
- errno);
+ /*
+ * 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;
}
+ close(fd);
+ close(sockfd);
+ sockfd = fd = -1;
+ addr = addr->ai_next;
}
- close(fd);
+error:
+ if (fd >= 0)
+ close(fd);
+ if (sockfd >= 0)
+ close(sockfd);
+ if (addrhead)
+ freeaddrinfo(addrhead);
+ return rc;
+}
- return;
+int
+nfssvc_set_sockets(const int family, const unsigned int protobits,
+ const char *host, const char *port)
+{
+ struct addrinfo hints = { .ai_flags = AI_PASSIVE };
+
+ hints.ai_family = family;
+
+ 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);
}
-static void
-nfssvc_versbits(unsigned int ctlbits, int minorvers4)
+
+void
+nfssvc_setvers(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);
xlog(D_GENERAL, "Writing version string to kernel: %s", buf);
- snprintf(ptr+off, BUFSIZ - off, "\n");
+ 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);
return;
}
+
int
-nfssvc(int port, int nrservs, unsigned int versbits, int minorvers4,
- unsigned protobits, char *haddr)
+nfssvc_threads(unsigned short port, const int nrservs)
{
struct nfsctl_arg arg;
+ struct servent *ent;
+ ssize_t n;
int fd;
- /* Note: must set versions before fds so that
- * the ports get registered with portmap against correct
- * versions
- */
- nfssvc_versbits(versbits, minorvers4);
- 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?
+ * Just write the number of threads.
*/
- 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))
return 0;
}
+ if (!port) {
+ ent = getservbyname("nfs", "udp");
+ if (ent != NULL)
+ port = ntohs(ent->s_port);
+ else
+ port = NFS_PORT;
+ }
+
arg.ca_version = NFSCTL_VERSION;
arg.ca_svc.svc_nthreads = nrservs;
arg.ca_svc.svc_port = port;
projects / nfs-utils.git / blobdiff