| |
| /* |
| * 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) |
| * |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include <sys/types.h> |
| #include <sys/select.h> |
| #include <sys/stat.h> |
| #include <sys/vfs.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 <pwd.h> |
| #include <grp.h> |
| #include <mntent.h> |
| #include "misc.h" |
| #include "nfslib.h" |
| #include "exportfs.h" |
| #include "mountd.h" |
| #include "xmalloc.h" |
| #include "fsloc.h" |
| #include "pseudoflavors.h" |
| |
| #ifdef USE_BLKID |
| #include "blkid/blkid.h" |
| #endif |
| |
| |
| enum nfsd_fsid { |
| FSID_DEV = 0, |
| FSID_NUM, |
| FSID_MAJOR_MINOR, |
| FSID_ENCODE_DEV, |
| FSID_UUID4_INUM, |
| FSID_UUID8, |
| FSID_UUID16, |
| FSID_UUID16_INUM, |
| }; |
| |
| /* |
| * 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. |
| * |
| */ |
| int cache_export_ent(char *domain, struct exportent *exp, char *p); |
| |
| |
| char *lbuf = NULL; |
| int lbuflen = 0; |
| extern int use_ipaddr; |
| |
| 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 = NULL; |
| struct in_addr addr; |
| struct hostent *he = NULL; |
| if (readline(fileno(f), &lbuf, &lbuflen) != 1) |
| return; |
| |
| xlog(D_CALL, "auth_unix_ip: inbuf '%s'", lbuf); |
| |
| 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; |
| |
| auth_reload(); |
| |
| /* addr is a valid, interesting address, find the domain name... */ |
| if (!use_ipaddr) { |
| he = client_resolve(addr); |
| client = client_compose(he); |
| } |
| |
| qword_print(f, "nfsd"); |
| qword_print(f, ipaddr); |
| qword_printint(f, time(0)+30*60); |
| if (use_ipaddr) |
| qword_print(f, ipaddr); |
| else if (client) |
| qword_print(f, *client?client:"DEFAULT"); |
| qword_eol(f); |
| xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT"); |
| |
| if (client) free(client); |
| free(he); |
| } |
| |
| void auth_unix_gid(FILE *f) |
| { |
| /* Request are |
| * uid |
| * reply is |
| * uid expiry count list of group ids |
| */ |
| int uid; |
| struct passwd *pw; |
| gid_t glist[100], *groups = glist; |
| int ngroups = 100; |
| int rv, i; |
| char *cp; |
| |
| if (readline(fileno(f), &lbuf, &lbuflen) != 1) |
| return; |
| |
| cp = lbuf; |
| if (qword_get_int(&cp, &uid) != 0) |
| return; |
| |
| pw = getpwuid(uid); |
| if (!pw) |
| rv = -1; |
| else { |
| rv = getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); |
| if (rv == -1 && ngroups >= 100) { |
| groups = malloc(sizeof(gid_t)*ngroups); |
| if (!groups) |
| rv = -1; |
| else |
| rv = getgrouplist(pw->pw_name, pw->pw_gid, |
| groups, &ngroups); |
| } |
| } |
| qword_printint(f, uid); |
| qword_printint(f, time(0)+30*60); |
| if (rv >= 0) { |
| qword_printint(f, ngroups); |
| for (i=0; i<ngroups; i++) |
| qword_printint(f, groups[i]); |
| } else |
| qword_printint(f, 0); |
| qword_eol(f); |
| |
| if (groups != glist) |
| free(groups); |
| } |
| |
| #if USE_BLKID |
| static const char *get_uuid_blkdev(char *path) |
| { |
| static blkid_cache cache = NULL; |
| struct stat stb; |
| char *devname; |
| blkid_tag_iterate iter; |
| blkid_dev dev; |
| const char *type; |
| const char *val = NULL; |
| |
| if (cache == NULL) |
| blkid_get_cache(&cache, NULL); |
| |
| if (stat(path, &stb) != 0) |
| return NULL; |
| devname = blkid_devno_to_devname(stb.st_dev); |
| if (!devname) |
| return NULL; |
| dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL); |
| free(devname); |
| if (!dev) |
| return NULL; |
| iter = blkid_tag_iterate_begin(dev); |
| if (!iter) |
| return NULL; |
| while (blkid_tag_next(iter, &type, &val) == 0) |
| if (strcmp(type, "UUID") == 0) |
| break; |
| blkid_tag_iterate_end(iter); |
| return val; |
| } |
| #else |
| #define get_uuid_blkdev(path) (NULL) |
| #endif |
| |
| int get_uuid(char *path, char *uuid, int uuidlen, char *u) |
| { |
| /* extract hex digits from uuidstr and compose a uuid |
| * of the given length (max 16), xoring bytes to make |
| * a smaller uuid. Then compare with uuid |
| */ |
| int i = 0; |
| const char *val = NULL; |
| char fsid_val[17]; |
| |
| if (path) { |
| val = get_uuid_blkdev(path); |
| if (!val) { |
| struct statfs64 st; |
| |
| if (statfs64(path, &st)) |
| return 0; |
| if (!st.f_fsid.__val[0] && !st.f_fsid.__val[1]) |
| return 0; |
| snprintf(fsid_val, 17, "%08x%08x", |
| st.f_fsid.__val[0], st.f_fsid.__val[1]); |
| val = fsid_val; |
| } |
| } else { |
| val = uuid; |
| } |
| |
| memset(u, 0, uuidlen); |
| for ( ; *val ; val++) { |
| char c = *val; |
| if (!isxdigit(c)) |
| continue; |
| if (isalpha(c)) { |
| if (isupper(c)) |
| c = c - 'A' + 10; |
| else |
| c = c - 'a' + 10; |
| } else |
| c = c - '0' + 0; |
| if ((i&1) == 0) |
| c <<= 4; |
| u[i/2] ^= c; |
| i++; |
| if (i == uuidlen*2) |
| i = 0; |
| } |
| return 1; |
| } |
| |
| /* Iterate through /etc/mtab, finding mountpoints |
| * at or below a given path |
| */ |
| static char *next_mnt(void **v, char *p) |
| { |
| FILE *f; |
| struct mntent *me; |
| int l = strlen(p); |
| if (*v == NULL) { |
| f = setmntent("/etc/mtab", "r"); |
| *v = f; |
| } else |
| f = *v; |
| while ((me = getmntent(f)) != NULL && |
| (strncmp(me->mnt_dir, p, l) != 0 || |
| me->mnt_dir[l] != '/')) |
| ; |
| if (me == NULL) { |
| endmntent(f); |
| *v = NULL; |
| return NULL; |
| } |
| return me->mnt_dir; |
| } |
| |
| 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 long long inode64; |
| unsigned int fsidnum=0; |
| char fsid[32]; |
| struct exportent *found = NULL; |
| struct hostent *he = NULL; |
| struct in_addr addr; |
| char *found_path = NULL; |
| nfs_export *exp; |
| int i; |
| int dev_missing = 0; |
| int uuidlen = 0; |
| char *fhuuid = NULL; |
| |
| if (readline(fileno(f), &lbuf, &lbuflen) != 1) |
| return; |
| |
| xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf); |
| |
| 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 > 7) |
| goto out; /* unknown type */ |
| if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0) |
| goto out; |
| switch(fsidtype) { |
| case FSID_DEV: /* 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 FSID_NUM: /* 4 bytes - fsid */ |
| if (fsidlen != 4) |
| goto out; |
| memcpy(&fsidnum, fsid, 4); |
| break; |
| |
| case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode |
| * This format is never actually used but was |
| * an historical accident |
| */ |
| if (fsidlen != 12) |
| goto out; |
| memcpy(&dev, fsid, 4); major = ntohl(dev); |
| memcpy(&dev, fsid+4, 4); minor = ntohl(dev); |
| memcpy(&inode, fsid+8, 4); |
| break; |
| |
| case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */ |
| /* This is *host* endian, not net-byte-order, because |
| * no-one outside this host has any business interpreting it |
| */ |
| if (fsidlen != 8) |
| goto out; |
| memcpy(&dev, fsid, 4); |
| memcpy(&inode, fsid+4, 4); |
| major = (dev & 0xfff00) >> 8; |
| minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); |
| break; |
| |
| case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */ |
| if (fsidlen != 8) |
| goto out; |
| memcpy(&inode, fsid, 4); |
| uuidlen = 4; |
| fhuuid = fsid+4; |
| break; |
| case FSID_UUID8: /* 8 byte uuid */ |
| if (fsidlen != 8) |
| goto out; |
| uuidlen = 8; |
| fhuuid = fsid; |
| break; |
| case FSID_UUID16: /* 16 byte uuid */ |
| if (fsidlen != 16) |
| goto out; |
| uuidlen = 16; |
| fhuuid = fsid; |
| break; |
| case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */ |
| if (fsidlen != 24) |
| goto out; |
| memcpy(&inode64, fsid, 8); |
| inode = inode64; |
| uuidlen = 16; |
| fhuuid = fsid+8; |
| break; |
| } |
| |
| auth_reload(); |
| |
| /* Now determine export point for this fsid/domain */ |
| for (i=0 ; i < MCL_MAXTYPES; i++) { |
| nfs_export *next_exp; |
| for (exp = exportlist[i].p_head; exp; exp = next_exp) { |
| struct stat stb; |
| char u[16]; |
| char *path; |
| |
| if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) { |
| static nfs_export *prev = NULL; |
| static void *mnt = NULL; |
| |
| if (prev == exp) { |
| /* try a submount */ |
| path = next_mnt(&mnt, exp->m_export.e_path); |
| if (!path) { |
| next_exp = exp->m_next; |
| prev = NULL; |
| continue; |
| } |
| next_exp = exp; |
| } else { |
| prev = exp; |
| mnt = NULL; |
| path = exp->m_export.e_path; |
| next_exp = exp; |
| } |
| } else { |
| path = exp->m_export.e_path; |
| next_exp = exp->m_next; |
| } |
| |
| if (!use_ipaddr && !client_member(dom, exp->m_client->m_hostname)) |
| continue; |
| if (exp->m_export.e_mountpoint && |
| !is_mountpoint(exp->m_export.e_mountpoint[0]? |
| exp->m_export.e_mountpoint: |
| exp->m_export.e_path)) |
| dev_missing ++; |
| if (stat(path, &stb) != 0) |
| continue; |
| if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) { |
| continue; |
| } |
| switch(fsidtype){ |
| case FSID_DEV: |
| case FSID_MAJOR_MINOR: |
| case FSID_ENCODE_DEV: |
| if (stb.st_ino != inode) |
| continue; |
| if (major != major(stb.st_dev) || |
| minor != minor(stb.st_dev)) |
| continue; |
| break; |
| case FSID_NUM: |
| if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 || |
| exp->m_export.e_fsid != fsidnum)) |
| continue; |
| break; |
| case FSID_UUID4_INUM: |
| case FSID_UUID16_INUM: |
| if (stb.st_ino != inode) |
| continue; |
| goto check_uuid; |
| case FSID_UUID8: |
| case FSID_UUID16: |
| if (!is_mountpoint(path)) |
| continue; |
| check_uuid: |
| if (exp->m_export.e_uuid) |
| get_uuid(NULL, exp->m_export.e_uuid, |
| uuidlen, u); |
| else if (get_uuid(path, NULL, uuidlen, u) == 0) |
| continue; |
| |
| if (memcmp(u, fhuuid, uuidlen) != 0) |
| continue; |
| break; |
| } |
| if (use_ipaddr) { |
| if (he == NULL) { |
| if (!inet_aton(dom, &addr)) |
| goto out; |
| he = client_resolve(addr); |
| } |
| if (!client_check(exp->m_client, he)) |
| continue; |
| } |
| /* It's a match !! */ |
| if (!found) { |
| found = &exp->m_export; |
| found_path = strdup(path); |
| if (found_path == NULL) |
| goto out; |
| } else if (strcmp(found->e_path, exp->m_export.e_path)!= 0) |
| { |
| xlog(L_WARNING, "%s and %s have same filehandle for %s, using first", |
| found_path, path, dom); |
| } |
| } |
| } |
| if (found && |
| found->e_mountpoint && |
| !is_mountpoint(found->e_mountpoint[0]? |
| found->e_mountpoint: |
| found->e_path)) { |
| /* Cannot export this yet |
| * should log a warning, but need to rate limit |
| xlog(L_WARNING, "%s not exported as %d not a mountpoint", |
| found->e_path, found->e_mountpoint); |
| */ |
| /* FIXME we need to make sure we re-visit this later */ |
| goto out; |
| } |
| if (!found && dev_missing) { |
| /* The missing dev could be what we want, so just be |
| * quite rather than returning stale yet |
| */ |
| goto out; |
| } |
| |
| if (found) |
| if (cache_export_ent(dom, found, found_path) < 0) |
| found = 0; |
| |
| qword_print(f, dom); |
| qword_printint(f, fsidtype); |
| qword_printhex(f, fsid, fsidlen); |
| /* The fsid -> path lookup can be quite expensive as it |
| * potentially stats and reads lots of devices, and some of those |
| * might have spun-down. The Answer is not likely to |
| * change underneath us, and an 'exportfs -f' can always |
| * remove this from the kernel, so use a really log |
| * timeout. Maybe this should be configurable on the command |
| * line. |
| */ |
| qword_printint(f, 0x7fffffff); |
| if (found) |
| qword_print(f, found_path); |
| qword_eol(f); |
| out: |
| if (found_path) |
| free(found_path); |
| if (he) |
| free(he); |
| free(dom); |
| xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL); |
| return; |
| } |
| |
| static void write_fsloc(FILE *f, struct exportent *ep, char *path) |
| { |
| struct servers *servers; |
| |
| if (ep->e_fslocmethod == FSLOC_NONE) |
| return; |
| |
| servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata, path); |
| if (!servers) |
| return; |
| qword_print(f, "fsloc"); |
| qword_printint(f, servers->h_num); |
| if (servers->h_num >= 0) { |
| int i; |
| for (i=0; i<servers->h_num; i++) { |
| qword_print(f, servers->h_mp[i]->h_host); |
| qword_print(f, servers->h_mp[i]->h_path); |
| } |
| } |
| qword_printint(f, servers->h_referral); |
| release_replicas(servers); |
| } |
| |
| static void write_secinfo(FILE *f, struct exportent *ep, int flag_mask) |
| { |
| struct sec_entry *p; |
| |
| for (p = ep->e_secinfo; p->flav; p++) |
| ; /* Do nothing */ |
| if (p == ep->e_secinfo) { |
| /* There was no sec= option */ |
| return; |
| } |
| qword_print(f, "secinfo"); |
| qword_printint(f, p - ep->e_secinfo); |
| for (p = ep->e_secinfo; p->flav; p++) { |
| qword_printint(f, p->flav->fnum); |
| qword_printint(f, p->flags & flag_mask); |
| } |
| |
| } |
| |
| static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *exp) |
| { |
| qword_print(f, domain); |
| qword_print(f, path); |
| qword_printint(f, time(0)+30*60); |
| if (exp) { |
| int different_fs = strcmp(path, exp->e_path) != 0; |
| int flag_mask = different_fs ? ~NFSEXP_FSID : ~0; |
| |
| qword_printint(f, exp->e_flags & flag_mask); |
| qword_printint(f, exp->e_anonuid); |
| qword_printint(f, exp->e_anongid); |
| qword_printint(f, exp->e_fsid); |
| write_fsloc(f, exp, path); |
| write_secinfo(f, exp, flag_mask); |
| if (exp->e_uuid == NULL || different_fs) { |
| char u[16]; |
| if (get_uuid(path, NULL, 16, u)) { |
| qword_print(f, "uuid"); |
| qword_printhex(f, u, 16); |
| } |
| } else { |
| char u[16]; |
| get_uuid(NULL, exp->e_uuid, 16, u); |
| qword_print(f, "uuid"); |
| qword_printhex(f, u, 16); |
| } |
| } |
| return qword_eol(f); |
| } |
| |
| static int is_subdirectory(char *subpath, char *path) |
| { |
| int l = strlen(path); |
| |
| return strcmp(subpath, path) == 0 |
| || (strncmp(subpath, path, l) == 0 && path[l] == '/'); |
| } |
| |
| static int path_matches(nfs_export *exp, char *path) |
| { |
| if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) |
| return is_subdirectory(path, exp->m_export.e_path); |
| return strcmp(path, exp->m_export.e_path) == 0; |
| } |
| |
| static int client_matches(nfs_export *exp, char *dom, struct hostent *he) |
| { |
| if (use_ipaddr) |
| return client_check(exp->m_client, he); |
| return client_member(dom, exp->m_client->m_hostname); |
| } |
| |
| static int export_matches(nfs_export *exp, char *dom, char *path, struct hostent *he) |
| { |
| return path_matches(exp, path) && client_matches(exp, dom, he); |
| } |
| |
| static nfs_export *lookup_export(char *dom, char *path, struct hostent *he) |
| { |
| nfs_export *exp; |
| nfs_export *found = NULL; |
| int found_type = 0; |
| int i; |
| |
| for (i=0 ; i < MCL_MAXTYPES; i++) { |
| for (exp = exportlist[i].p_head; exp; exp = exp->m_next) { |
| if (!export_matches(exp, dom, path, he)) |
| continue; |
| if (!found) { |
| found = exp; |
| found_type = i; |
| continue; |
| } |
| |
| /* Always prefer non-V4ROOT mounts */ |
| if (found->m_export.e_flags & NFSEXP_V4ROOT) |
| continue; |
| |
| /* If one is a CROSSMOUNT, then prefer the longest path */ |
| if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) || |
| (exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) && |
| strlen(found->m_export.e_path) != |
| strlen(exp->m_export.e_path)) { |
| |
| if (strlen(exp->m_export.e_path) > |
| strlen(found->m_export.e_path)) { |
| found = exp; |
| found_type = i; |
| } |
| continue; |
| |
| } else if (found_type == i && found->m_warned == 0) { |
| xlog(L_WARNING, "%s exported to both %s and %s, " |
| "arbitrarily choosing options from first", |
| path, found->m_client->m_hostname, exp->m_client->m_hostname, |
| dom); |
| found->m_warned = 1; |
| } |
| } |
| } |
| return found; |
| } |
| |
| void nfsd_export(FILE *f) |
| { |
| /* requests are: |
| * domain path |
| * determine export options and return: |
| * domain path expiry flags anonuid anongid fsid |
| */ |
| |
| char *cp; |
| char *dom, *path; |
| nfs_export *found = NULL; |
| struct in_addr addr; |
| struct hostent *he = NULL; |
| |
| |
| if (readline(fileno(f), &lbuf, &lbuflen) != 1) |
| return; |
| |
| xlog(D_CALL, "nfsd_export: inbuf '%s'", lbuf); |
| |
| 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; |
| |
| auth_reload(); |
| |
| if (use_ipaddr) { |
| if (!inet_aton(dom, &addr)) |
| goto out; |
| he = client_resolve(addr); |
| } |
| |
| found = lookup_export(dom, path, he); |
| |
| if (found) { |
| if (dump_to_cache(f, dom, path, &found->m_export) < 0) { |
| xlog(L_WARNING, |
| "Cannot export %s, possibly unsupported filesystem" |
| " or fsid= required", path); |
| dump_to_cache(f, dom, path, NULL); |
| } |
| } else { |
| dump_to_cache(f, dom, path, NULL); |
| } |
| out: |
| xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL); |
| if (dom) free(dom); |
| if (path) free(path); |
| if (he) free(he); |
| } |
| |
| |
| struct { |
| char *cache_name; |
| void (*cache_handle)(FILE *f); |
| FILE *f; |
| } cachelist[] = { |
| { "auth.unix.ip", auth_unix_ip}, |
| { "auth.unix.gid", auth_unix_gid}, |
| { "nfsd.export", nfsd_export}, |
| { "nfsd.fh", nfsd_fh}, |
| { NULL, NULL } |
| }; |
| |
| extern int manage_gids; |
| void cache_open(void) |
| { |
| int i; |
| for (i=0; cachelist[i].cache_name; i++ ) { |
| char path[100]; |
| if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid) |
| continue; |
| 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); |
| FD_CLR(fileno(cachelist[i].f), readfds); |
| } |
| } |
| 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 |
| */ |
| |
| int cache_export_ent(char *domain, struct exportent *exp, char *path) |
| { |
| int err; |
| FILE *f = fopen("/proc/net/rpc/nfsd.export/channel", "w"); |
| if (!f) |
| return -1; |
| |
| err = dump_to_cache(f, domain, exp->e_path, exp); |
| if (err) { |
| xlog(L_WARNING, |
| "Cannot export %s, possibly unsupported filesystem or" |
| " fsid= required", exp->e_path); |
| } |
| |
| while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) { |
| /* really an 'if', but we can break out of |
| * a 'while' more easily */ |
| /* Look along 'path' for other filesystems |
| * and export them with the same options |
| */ |
| struct stat stb; |
| int l = strlen(exp->e_path); |
| int dev; |
| |
| if (strlen(path) <= l || path[l] != '/' || |
| strncmp(exp->e_path, path, l) != 0) |
| break; |
| if (stat(exp->e_path, &stb) != 0) |
| break; |
| dev = stb.st_dev; |
| while(path[l] == '/') { |
| char c; |
| /* errors for submount should fail whole filesystem */ |
| int err2; |
| |
| l++; |
| while (path[l] != '/' && path[l]) |
| l++; |
| c = path[l]; |
| path[l] = 0; |
| err2 = lstat(path, &stb); |
| path[l] = c; |
| if (err2 < 0) |
| break; |
| if (stb.st_dev == dev) |
| continue; |
| dev = stb.st_dev; |
| path[l] = 0; |
| dump_to_cache(f, domain, path, exp); |
| path[l] = c; |
| } |
| break; |
| } |
| |
| fclose(f); |
| return err; |
| } |
| |
| int cache_export(nfs_export *exp, char *path) |
| { |
| int err; |
| FILE *f; |
| |
| f = fopen("/proc/net/rpc/auth.unix.ip/channel", "w"); |
| if (!f) |
| return -1; |
| |
| 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); |
| err = qword_eol(f); |
| |
| fclose(f); |
| |
| err = cache_export_ent(exp->m_client->m_hostname, &exp->m_export, path) |
| || err; |
| return err; |
| } |
| |
| /* Get a filehandle. |
| * { |
| * echo $domain $path $length |
| * read filehandle <&0 |
| * } <> /proc/fs/nfsd/filehandle |
| */ |
| struct nfs_fh_len * |
| cache_get_filehandle(nfs_export *exp, int len, char *p) |
| { |
| FILE *f = fopen("/proc/fs/nfsd/filehandle", "r+"); |
| char buf[200]; |
| char *bp = buf; |
| int failed; |
| static struct nfs_fh_len fh; |
| |
| if (!f) |
| f = fopen("/proc/fs/nfs/filehandle", "r+"); |
| if (!f) |
| return NULL; |
| |
| qword_print(f, exp->m_client->m_hostname); |
| qword_print(f, p); |
| qword_printint(f, len); |
| failed = qword_eol(f); |
| |
| if (!failed) |
| failed = (fgets(buf, sizeof(buf), f) == NULL); |
| fclose(f); |
| if (failed) |
| return NULL; |
| memset(fh.fh_handle, 0, sizeof(fh.fh_handle)); |
| fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE); |
| return &fh; |
| } |
| |