6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
13 #include <sys/types.h>
14 #include <sys/socket.h>
16 #include <netinet/in.h>
17 #include <arpa/inet.h>
25 #define NFSD_PORTS_FILE "/proc/fs/nfsd/portlist"
26 #define NFSD_VERS_FILE "/proc/fs/nfsd/versions"
27 #define NFSD_THREAD_FILE "/proc/fs/nfsd/threads"
30 * declaring a common static scratch buffer here keeps us from having to
31 * continually thrash the stack. The value of 128 bytes here is really just a
32 * SWAG and can be increased if necessary. It ought to be enough for the
33 * routines below however.
38 * Are there already sockets configured? If not, then it is safe to try to
39 * open some and pass them through.
41 * Note: If the user explicitly asked for 'udp', then we should probably check
42 * if that is open, and should open it if not. However we don't yet. All
43 * sockets have to be opened when the first daemon is started.
50 fd = open(NFSD_PORTS_FILE, O_RDONLY);
52 /* problem opening file, assume that nothing is configured */
56 n = read(fd, buf, sizeof(buf));
59 xlog(D_GENERAL, "knfsd is currently %s", (n > 0) ? "up" : "down");
65 nfssvc_setfds(const struct addrinfo *hints, const char *node, const char *port)
67 int fd, on = 1, fac = L_ERROR;
68 int sockfd = -1, rc = 0;
69 struct addrinfo *addrhead = NULL, *addr;
73 * if file can't be opened, then assume that it's not available and
74 * that the caller should just fall back to the old nfsctl interface
76 fd = open(NFSD_PORTS_FILE, O_WRONLY);
80 switch(hints->ai_family) {
88 #endif /* IPV6_SUPPORTED */
90 xlog(L_ERROR, "Unknown address family specified: %d\n",
96 rc = getaddrinfo(node, port, hints, &addrhead);
97 if (rc == EAI_NONAME && !strcmp(port, "nfs")) {
98 snprintf(buf, sizeof(buf), "%d", NFS_PORT);
99 rc = getaddrinfo(node, buf, hints, &addrhead);
103 xlog(L_ERROR, "unable to resolve %s:%s to %s address: "
104 "%s", node ? node : "ANYADDR", port, family,
105 rc == EAI_SYSTEM ? strerror(errno) :
112 /* skip non-TCP / non-UDP sockets */
113 switch(addr->ai_protocol) {
121 addr = addr->ai_next;
125 xlog(D_GENERAL, "Creating %s %s socket.", family, proto);
127 /* open socket and prepare to hand it off to kernel */
128 sockfd = socket(addr->ai_family, addr->ai_socktype,
131 xlog(L_ERROR, "unable to create %s %s socket: "
132 "errno %d (%m)", family, proto, errno);
136 #ifdef IPV6_SUPPORTED
137 if (addr->ai_family == AF_INET6 &&
138 setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on))) {
139 xlog(L_ERROR, "unable to set IPV6_V6ONLY: "
140 "errno %d (%m)\n", errno);
144 #endif /* IPV6_SUPPORTED */
145 if (addr->ai_protocol == IPPROTO_TCP &&
146 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) {
147 xlog(L_ERROR, "unable to set SO_REUSEADDR on %s "
148 "socket: errno %d (%m)", family, errno);
152 if (bind(sockfd, addr->ai_addr, addr->ai_addrlen)) {
153 xlog(L_ERROR, "unable to bind %s %s socket: "
154 "errno %d (%m)", family, proto, errno);
158 if (addr->ai_protocol == IPPROTO_TCP && listen(sockfd, 64)) {
159 xlog(L_ERROR, "unable to create listening socket: "
160 "errno %d (%m)", errno);
166 fd = open(NFSD_PORTS_FILE, O_WRONLY);
169 xlog(L_ERROR, "couldn't open ports file: errno "
174 snprintf(buf, sizeof(buf), "%d\n", sockfd);
175 if (write(fd, buf, strlen(buf)) != strlen(buf)) {
177 * this error may be common on older kernels that don't
178 * support IPv6, so turn into a debug message.
180 if (errno == EAFNOSUPPORT)
182 xlog(fac, "writing fd to kernel failed: errno %d (%m)",
190 addr = addr->ai_next;
198 freeaddrinfo(addrhead);
203 nfssvc_set_sockets(const int family, const unsigned int protobits,
204 const char *host, const char *port)
206 struct addrinfo hints = { .ai_flags = AI_PASSIVE | AI_ADDRCONFIG };
208 hints.ai_family = family;
210 if (!NFSCTL_ANYPROTO(protobits))
212 else if (!NFSCTL_UDPISSET(protobits))
213 hints.ai_protocol = IPPROTO_TCP;
214 else if (!NFSCTL_TCPISSET(protobits))
215 hints.ai_protocol = IPPROTO_UDP;
217 return nfssvc_setfds(&hints, host, port);
221 nfssvc_setvers(unsigned int ctlbits, int minorvers4)
228 fd = open(NFSD_VERS_FILE, O_WRONLY);
232 for (n = NFSD_MINVERS; n <= NFSD_MAXVERS; n++) {
233 if (NFSCTL_VERISSET(ctlbits, n))
234 off += snprintf(ptr+off, sizeof(buf) - off, "+%d ", n);
236 off += snprintf(ptr+off, sizeof(buf) - off, "-%d ", n);
238 n = minorvers4 >= 0 ? minorvers4 : -minorvers4;
239 if (n >= NFSD_MINMINORVERS4 && n <= NFSD_MAXMINORVERS4)
240 off += snprintf(ptr+off, sizeof(buf) - off, "%c4.%d",
241 minorvers4 > 0 ? '+' : '-',
243 xlog(D_GENERAL, "Writing version string to kernel: %s", buf);
244 snprintf(ptr+off, sizeof(buf) - off, "\n");
245 if (write(fd, buf, strlen(buf)) != strlen(buf))
246 xlog(L_ERROR, "Setting version failed: errno %d (%m)", errno);
254 nfssvc_threads(unsigned short port, const int nrservs)
256 struct nfsctl_arg arg;
261 fd = open(NFSD_THREAD_FILE, O_WRONLY);
263 fd = open("/proc/fs/nfs/threads", O_WRONLY);
265 /* 2.5+ kernel with nfsd filesystem mounted.
266 * Just write the number of threads.
268 snprintf(buf, sizeof(buf), "%d\n", nrservs);
269 n = write(fd, buf, strlen(buf));
271 if (n != strlen(buf))
278 ent = getservbyname("nfs", "udp");
280 port = ntohs(ent->s_port);
285 arg.ca_version = NFSCTL_VERSION;
286 arg.ca_svc.svc_nthreads = nrservs;
287 arg.ca_svc.svc_port = port;
288 return nfsctl(NFSCTL_SVC, &arg, NULL);