3 * Handle communication with knfsd internal cache
5 * We open /proc/net/rpc/{auth.unix.ip,nfsd.export,nfsd.fh}/channel
6 * and listen for requests (using my_svc_run)
11 #include <sys/types.h>
12 #include <sys/select.h>
15 #include <netinet/in.h>
16 #include <arpa/inet.h>
28 * Support routines for text-based upcalls.
29 * Fields are separated by spaces.
30 * Fields are either mangled to quote space tab newline slosh with slosh
31 * or a hexified with a leading \x
32 * Record is terminated with newline.
35 void cache_export_ent(char *domain, struct exportent *exp);
41 void auth_unix_ip(FILE *f)
45 * Ignore if class != "nfsd"
46 * Otherwise find domainname and write back:
48 * "nfsd" IP-ADDR expiry domainname
55 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
60 if (qword_get(&cp, class, 20) <= 0 ||
61 strcmp(class, "nfsd") != 0)
64 if (qword_get(&cp, ipaddr, 20) <= 0)
67 if (inet_aton(ipaddr, &addr)==0)
70 /* addr is a valid, interesting address, find the domain name... */
71 client = client_compose(addr);
74 qword_print(f, "nfsd");
75 qword_print(f, ipaddr);
76 qword_printint(f, time(0)+30*60);
78 qword_print(f, *client?client:"DEFAULT");
81 if (client) free(client);
88 * domain fsidtype fsid
89 * interpret fsid, find export point and options, and write:
90 * domain fsidtype fsid expiry path
96 unsigned int dev, major=0, minor=0;
98 unsigned int fsidnum=0;
100 struct exportent *found = NULL;
105 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
110 dom = malloc(strlen(cp));
113 if (qword_get(&cp, dom, strlen(cp)) <= 0)
115 if (qword_get_int(&cp, &fsidtype) != 0)
117 if (fsidtype < 0 || fsidtype > 1)
118 goto out; /* unknown type */
119 if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
122 case 0: /* 4 bytes: 2 major, 2 minor, 4 inode */
125 memcpy(&dev, fsid, 4);
126 memcpy(&inode, fsid+4, 4);
127 major = ntohl(dev)>>16;
128 minor = ntohl(dev) & 0xFFFF;
131 case 1: /* 4 bytes - fsid */
134 memcpy(&fsidnum, fsid, 4);
138 /* Now determine export point for this fsid/domain */
139 for (i=0 ; i < MCL_MAXTYPES; i++) {
140 for (exp = exportlist[i]; exp; exp = exp->m_next) {
141 if (!client_member(dom, exp->m_client->m_hostname))
144 ((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
145 exp->m_export.e_fsid != fsidnum))
149 if (exp->m_export.e_mountpoint &&
150 !is_mountpoint(exp->m_export.e_mountpoint[0]?
151 exp->m_export.e_mountpoint:
152 exp->m_export.e_path))
154 if (stat(exp->m_export.e_path, &stb) != 0)
156 if (stb.st_ino != inode)
158 if (major != major(stb.st_dev) ||
159 minor != minor(stb.st_dev))
162 /* It's a match !! */
164 found = &exp->m_export;
165 else if (strcmp(found->e_path, exp->m_export.e_path)!= 0)
167 xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
168 found->e_path, exp->m_export.e_path, dom);
173 found->e_mountpoint &&
174 !is_mountpoint(found->e_mountpoint[0]?
177 /* Cannot export this yet
178 * should log a warning, but need to rate limit
179 xlog(L_WARNING, "%s not exported as %d not a mountpoint",
180 found->e_path, found->e_mountpoint);
182 /* FIXME we need to make sure we re-visit this later */
185 if (!found && dev_missing) {
186 /* The missing dev could be what we want, so just be
187 * quite rather than returning stale yet
192 cache_export_ent(dom, found);
195 qword_printint(f, fsidtype);
196 qword_printhex(f, fsid, fsidlen);
197 qword_printint(f, time(0)+30*60);
199 qword_print(f, found->e_path);
206 void nfsd_export(FILE *f)
210 * determine export options and return:
211 * domain path expiry flags anonuid anongid fsid
217 nfs_export *exp, *found = NULL;
220 if (readline(fileno(f), &lbuf, &lbuflen) != 1)
224 dom = malloc(strlen(cp));
225 path = malloc(strlen(cp));
230 if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
232 if (qword_get(&cp, path, strlen(lbuf)) <= 0)
235 /* now find flags for this export point in this domain */
236 for (i=0 ; i < MCL_MAXTYPES; i++) {
237 for (exp = exportlist[i]; exp; exp = exp->m_next) {
238 if (!client_member(dom, exp->m_client->m_hostname))
240 if (strcmp(path, exp->m_export.e_path))
245 xlog(L_WARNING, "%s exported to both %s and %s in %s",
246 path, exp->m_client->m_hostname, found->m_client->m_hostname,
253 qword_print(f, path);
254 qword_printint(f, time(0)+30*60);
256 qword_printint(f, found->m_export.e_flags);
257 qword_printint(f, found->m_export.e_anonuid);
258 qword_printint(f, found->m_export.e_anongid);
259 qword_printint(f, found->m_export.e_fsid);
264 if (path) free(path);
270 void (*cache_handle)(FILE *f);
273 { "auth.unix.ip", auth_unix_ip},
274 { "nfsd.export", nfsd_export},
275 { "nfsd.fh", nfsd_fh},
279 void cache_open(void)
282 for (i=0; cachelist[i].cache_name; i++ ){
284 sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
285 cachelist[i].f = fopen(path, "r+");
289 void cache_set_fds(fd_set *fdset)
292 for (i=0; cachelist[i].cache_name; i++) {
294 FD_SET(fileno(cachelist[i].f), fdset);
298 int cache_process_req(fd_set *readfds)
302 for (i=0; cachelist[i].cache_name; i++) {
303 if (cachelist[i].f != NULL &&
304 FD_ISSET(fileno(cachelist[i].f), readfds)) {
306 cachelist[i].cache_handle(cachelist[i].f);
314 * Give IP->domain and domain+path->options to kernel
315 * % echo nfsd $IP $[now+30*60] $domain > /proc/net/rpc/auth.unix.ip/channel
316 * % echo $domain $path $[now+30*60] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
319 void cache_export_ent(char *domain, struct exportent *exp)
322 FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "r+");
326 qword_print(f, domain);
327 qword_print(f, exp->e_path);
328 qword_printint(f, time(0)+30*60);
329 qword_printint(f, exp->e_flags);
330 qword_printint(f, exp->e_anonuid);
331 qword_printint(f, exp->e_anongid);
332 qword_printint(f, exp->e_fsid);
338 void cache_export(nfs_export *exp)
342 f = fopen("/proc/net/rpc/auth.unix.ip/channel", "r+");
346 qword_print(f, "nfsd");
347 qword_print(f, inet_ntoa(exp->m_client->m_addrlist[0]));
348 qword_printint(f, time(0)+30*60);
349 qword_print(f, exp->m_client->m_hostname);
354 cache_export_ent(exp->m_client->m_hostname, &exp->m_export);
359 * echo $domain $path $length
360 * read filehandle <&0
361 * } <> /proc/fs/nfs/filehandle
364 cache_get_filehandle(nfs_export *exp, int len, char *p)
366 FILE *f = fopen("/proc/fs/nfs/filehandle", "r+");
369 static struct nfs_fh_len fh;
373 qword_print(f, exp->m_client->m_hostname);
375 qword_printint(f, len);
378 if (fgets(buf, sizeof(buf), f) == NULL)
380 memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
381 fh.fh_size = qword_get(&bp, fh.fh_handle, NFS3_FHSIZE);