+
+/*
+ * Handle communication with knfsd internal cache
+ *
+ * We open /proc/net/rpc/{auth.unix.ip,nfsd.export,nfsd.fh}/channel
+ * and listen for requests (using my_svc_run)
+ *
+ */
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/select.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include "misc.h"
+#include "nfslib.h"
+#include "exportfs.h"
+#include "mountd.h"
+#include "xmalloc.h"
+
+/*
+ * Support routines for text-based upcalls.
+ * Fields are separated by spaces.
+ * Fields are either mangled to quote space tab newline slosh with slosh
+ * or a hexified with a leading \x
+ * Record is terminated with newline.
+ *
+ */
+void cache_export_ent(char *domain, struct exportent *exp);
+
+
+char *lbuf = NULL;
+int lbuflen = 0;
+
+void auth_unix_ip(FILE *f)
+{
+ /* requests are
+ * class IP-ADDR
+ * Ignore if class != "nfsd"
+ * Otherwise find domainname and write back:
+ *
+ * "nfsd" IP-ADDR expiry domainname
+ */
+ char *cp;
+ char class[20];
+ char ipaddr[20];
+ char *client;
+ struct in_addr addr;
+ if (readline(fileno(f), &lbuf, &lbuflen) != 1)
+ return;
+
+ cp = lbuf;
+
+ if (qword_get(&cp, class, 20) <= 0 ||
+ strcmp(class, "nfsd") != 0)
+ return;
+
+ if (qword_get(&cp, ipaddr, 20) <= 0)
+ return;
+
+ if (inet_aton(ipaddr, &addr)==0)
+ return;
+
+ /* addr is a valid, interesting address, find the domain name... */
+ client = client_compose(addr);
+
+
+ qword_print(f, "nfsd");
+ qword_print(f, ipaddr);
+ qword_printint(f, time(0)+30*60);
+ if (client)
+ qword_print(f, *client?client:"DEFAULT");
+ qword_eol(f);
+
+ if (client) free(client);
+
+}
+
+void nfsd_fh(FILE *f)
+{
+ /* request are:
+ * domain fsidtype fsid
+ * interpret fsid, find export point and options, and write:
+ * domain fsidtype fsid expiry path
+ */
+ char *cp;
+ char *dom;
+ int fsidtype;
+ int fsidlen;
+ unsigned int dev, major=0, minor=0;
+ unsigned int inode=0;
+ unsigned int fsidnum=0;
+ char fsid[32];
+ struct exportent *found = NULL;
+ nfs_export *exp;
+ int i;
+
+ if (readline(fileno(f), &lbuf, &lbuflen) != 1)
+ return;
+
+ cp = lbuf;
+
+ dom = malloc(strlen(cp));
+ if (dom == NULL)
+ return;
+ if (qword_get(&cp, dom, strlen(cp)) <= 0)
+ goto out;
+ if (qword_get_int(&cp, &fsidtype) != 0)
+ goto out;
+ if (fsidtype < 0 || fsidtype > 1)
+ goto out; /* unknown type */
+ if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0)
+ goto out;
+ switch(fsidtype) {
+ case 0: /* 4 bytes: 2 major, 2 minor, 4 inode */
+ if (fsidlen != 8)
+ goto out;
+ memcpy(&dev, fsid, 4);
+ memcpy(&inode, fsid+4, 4);
+ major = ntohl(dev)>>16;
+ minor = ntohl(dev) & 0xFFFF;
+ break;
+
+ case 1: /* 4 bytes - fsid */
+ if (fsidlen != 4)
+ goto out;
+ memcpy(&fsidnum, fsid, 4);
+ break;
+ }
+
+ /* Now determine export point for this fsid/domain */
+ for (i=0 ; i < MCL_MAXTYPES; i++) {
+ for (exp = exportlist[i]; exp; exp = exp->m_next) {
+ if (!client_member(dom, exp->m_client->m_hostname))
+ continue;
+ if (fsidtype == 1 &&
+ ((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
+ exp->m_export.e_fsid != fsidnum))
+ continue;
+ if (fsidtype == 0) {
+ struct stat stb;
+ if (stat(exp->m_export.e_path, &stb) != 0)
+ continue;
+ if (stb.st_ino != inode)
+ continue;
+ if (major != major(stb.st_dev) ||
+ minor != minor(stb.st_dev))
+ continue;
+ }
+ /* It's a match !! */
+ if (!found)
+ found = &exp->m_export;
+ else if (strcmp(found->e_path, exp->m_export.e_path)!= 0)
+ {
+ xlog(L_WARNING, "%s and %s have name filehandle for %s, using first",
+ found->e_path, exp->m_export.e_path, dom);
+ }
+ }
+ }
+ cache_export_ent(dom, found);
+
+ qword_print(f, dom);
+ qword_printint(f, fsidtype);
+ qword_printhex(f, fsid, fsidlen);
+ qword_printint(f, time(0)+30*60);
+ if (found)
+ qword_print(f, found->e_path);
+ qword_eol(f);
+ out:
+ free(dom);
+ return;
+}
+
+void nfsd_export(FILE *f)
+{
+ /* requests are:
+ * domain path
+ * determine export options and return:
+ * domain path expiry flags anonuid anongid fsid
+ */
+
+ char *cp;
+ int i;
+ char *dom, *path;
+ nfs_export *exp, *found = NULL;
+
+
+ if (readline(fileno(f), &lbuf, &lbuflen) != 1)
+ return;
+
+ cp = lbuf;
+ dom = malloc(strlen(cp));
+ path = malloc(strlen(cp));
+
+ if (!dom || !path)
+ goto out;
+
+ if (qword_get(&cp, dom, strlen(lbuf)) <= 0)
+ goto out;
+ if (qword_get(&cp, path, strlen(lbuf)) <= 0)
+ goto out;
+
+ /* now find flags for this export point in this domain */
+ for (i=0 ; i < MCL_MAXTYPES; i++) {
+ for (exp = exportlist[i]; exp; exp = exp->m_next) {
+ if (!client_member(dom, exp->m_client->m_hostname))
+ continue;
+ if (strcmp(path, exp->m_export.e_path))
+ continue;
+ if (!found)
+ found = exp;
+ else {
+ xlog(L_WARNING, "%s exported to both %s and %s in %s",
+ path, exp->m_client->m_hostname, found->m_client->m_hostname,
+ dom);
+ }
+ }
+ }
+
+ qword_print(f, dom);
+ qword_print(f, path);
+ qword_printint(f, time(0)+30*60);
+ if (found) {
+ qword_printint(f, found->m_export.e_flags);
+ qword_printint(f, found->m_export.e_anonuid);
+ qword_printint(f, found->m_export.e_anongid);
+ qword_printint(f, found->m_export.e_fsid);
+ }
+ qword_eol(f);
+ out:
+ if (dom) free(dom);
+ if (path) free(path);
+}
+
+
+struct {
+ char *cache_name;
+ void (*cache_handle)(FILE *f);
+ FILE *f;
+} cachelist[] = {
+ { "auth.unix.ip", auth_unix_ip},
+ { "nfsd.export", nfsd_export},
+ { "nfsd.fh", nfsd_fh},
+ { NULL, NULL }
+};
+
+void cache_open(void)
+{
+ int i;
+ for (i=0; cachelist[i].cache_name; i++ ){
+ char path[100];
+ sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
+ cachelist[i].f = fopen(path, "r+");
+ }
+}
+
+void cache_set_fds(fd_set *fdset)
+{
+ int i;
+ for (i=0; cachelist[i].cache_name; i++) {
+ if (cachelist[i].f)
+ FD_SET(fileno(cachelist[i].f), fdset);
+ }
+}
+
+int cache_process_req(fd_set *readfds)
+{
+ int i;
+ int cnt = 0;
+ for (i=0; cachelist[i].cache_name; i++) {
+ if (cachelist[i].f != NULL &&
+ FD_ISSET(fileno(cachelist[i].f), readfds)) {
+ cnt++;
+ cachelist[i].cache_handle(cachelist[i].f);
+ }
+ }
+ return cnt;
+}
+
+
+/*
+ * Give IP->domain and domain+path->options to kernel
+ * % echo nfsd $IP $[now+30*60] $domain > /proc/net/rpc/auth.unix.ip/channel
+ * % echo $domain $path $[now+30*60] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
+ */
+
+void cache_export_ent(char *domain, struct exportent *exp)
+{
+
+ FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "r+");
+ if (!f)
+ return;
+
+ qword_print(f, domain);
+ qword_print(f, exp->e_path);
+ qword_printint(f, time(0)+30*60);
+ qword_printint(f, exp->e_flags);
+ qword_printint(f, exp->e_anonuid);
+ qword_printint(f, exp->e_anongid);
+ qword_printint(f, exp->e_fsid);
+ qword_eol(f);
+
+ fclose(f);
+}
+
+void cache_export(nfs_export *exp)
+{
+ FILE *f;
+
+ f = fopen("/proc/net/rpc/auth.unix.ip/channel", "r+");
+ if (!f)
+ return;
+
+ qword_print(f, "nfsd");
+ qword_print(f, inet_ntoa(exp->m_client->m_addrlist[0]));
+ qword_printint(f, time(0)+30*60);
+ qword_print(f, exp->m_client->m_hostname);
+ qword_eol(f);
+
+ fclose(f);
+
+ cache_export_ent(exp->m_client->m_hostname, &exp->m_export);
+}
+
+/* Get a filehandle.
+ * {
+ * echo $domain $path $length
+ * read filehandle <&0
+ * } <> /proc/fs/nfs/filehandle
+ */
+struct nfs_fh_len *
+cache_get_filehandle(nfs_export *exp, int len)
+{
+ FILE *f = fopen("/proc/fs/nfs/filehandle", "r+");
+ char buf[200];
+ char *bp = buf;
+ static struct nfs_fh_len fh;
+ if (!f)
+ return NULL;
+
+ qword_print(f, exp->m_client->m_hostname);
+ qword_print(f, exp->m_export.e_path);
+ qword_printint(f, len);
+ qword_eol(f);
+
+ if (fgets(buf, sizeof(buf), f) == NULL)
+ return NULL;
+ memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
+ fh.fh_size = qword_get(&bp, fh.fh_handle, NFS3_FHSIZE);
+ return &fh;
+}
+
projects / nfs-utils.git / commitdiff