1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2005 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <sys/param.h>
27 #include <sys/utsname.h>
29 #include <sys/socket.h>
30 #include <arpa/inet.h>
31 #include <sys/types.h>
47 #ifdef HAVE_GETHOSTBYNAME
52 # include "lgss_utils.h"
54 # include "err_util.h"
59 const char * lustre_svc_name[] =
61 [LUSTRE_GSS_SVC_MDS] = "MDS",
62 [LUSTRE_GSS_SVC_OSS] = "OSS",
65 /****************************************
67 ****************************************/
69 static struct __sem_s {
74 [GSSD_CLI] = { "client", 0x3a92d473, 0 },
75 [GSSD_SVC] = { "server", 0x3b92d473, 0 },
78 void gssd_init_unique(int type)
80 struct __sem_s *sem = &sems[type];
83 assert(type == GSSD_CLI || type == GSSD_SVC);
86 sem->sem_id = semget(sem->sem_key, 1, IPC_CREAT | IPC_EXCL | 0700);
87 if (sem->sem_id == -1) {
88 if (errno != EEXIST) {
89 printerr(0, "Create sem: %s\n", strerror(errno));
93 /* already exist. Note there's still a small window racing
94 * with other processes, due to the stupid semaphore semantics.
96 sem->sem_id = semget(sem->sem_key, 0, 0700);
97 if (sem->sem_id == -1) {
98 if (errno == ENOENT) {
99 printerr(0, "another instance just exit, "
104 printerr(0, "Obtain sem: %s\n", strerror(errno));
110 if (semctl(sem->sem_id, 0, SETVAL, val) == -1) {
111 printerr(0, "Initialize sem: %s\n",
119 sembuf.sem_flg = IPC_NOWAIT | SEM_UNDO;
121 if (semop(sem->sem_id, &sembuf, 1) != 0) {
122 if (errno == EAGAIN) {
123 printerr(0, "Another instance is running, exit\n");
126 printerr(0, "Grab sem: %s\n", strerror(errno));
130 printerr(2, "Successfully created %s global identity\n", sem->name);
133 void gssd_exit_unique(int type)
135 assert(type == GSSD_CLI || type == GSSD_SVC);
138 * do nothing. we can't remove the sem here, otherwise the race
139 * window would be much bigger. So it's sad we have to leave the
140 * sem in the system forever.
144 /****************************************
145 * client side resolvation: *
146 * lnd/netid/nid => hostname *
147 ****************************************/
149 char gethostname_ex[PATH_MAX] = GSSD_DEFAULT_GETHOSTNAME_EX;
151 typedef int lnd_nid2hostname_t(char *lnd, uint32_t net, uint32_t addr,
152 char *buf, int buflen);
154 /* FIXME what about IPv6? */
156 int ipv4_nid2hostname(char *lnd, uint32_t net, uint32_t addr,
157 char *buf, int buflen)
162 ent = gethostbyaddr(&addr, sizeof(addr), AF_INET);
164 printerr(0, "%s: can't resolve 0x%x\n", lnd, addr);
167 if (strlen(ent->h_name) >= buflen) {
168 printerr(0, "%s: name too long: %s\n", lnd, ent->h_name);
171 strcpy(buf, ent->h_name);
173 printerr(2, "%s: net 0x%x, addr 0x%x => %s\n",
174 lnd, net, addr, buf);
179 int lolnd_nid2hostname(char *lnd, uint32_t net, uint32_t addr,
180 char *buf, int buflen)
186 printerr(0, "%s: addr is 0x%x, we expect 0\n", lnd, addr);
191 printerr(0, "%s: failed obtain local machine name\n", lnd);
195 ent = gethostbyname(uts.nodename);
197 printerr(0, "%s: failed obtain canonical name of %s\n",
202 if (strlen(ent->h_name) >= buflen) {
203 printerr(0, "%s: name too long: %s\n", lnd, ent->h_name);
206 strcpy(buf, ent->h_name);
208 printerr(3, "%s: addr 0x%x => %s\n", lnd, addr, buf);
212 static int is_space(char c)
214 return (c == ' ' || c == '\t' || c == '\n');
218 int external_nid2hostname(char *lnd, uint32_t net, uint32_t addr,
219 char *namebuf, int namebuflen)
221 const int bufsize = PATH_MAX + 256;
222 char buf[bufsize], *head, *tail;
225 sprintf(buf, "%s %s 0x%x 0x%x", gethostname_ex, lnd, net, addr);
226 printerr(2, "cmd: %s\n", buf);
228 fghn = popen(buf, "r");
230 printerr(0, "failed to call %s\n", gethostname_ex);
234 head = fgets(buf, bufsize, fghn);
236 printerr(0, "can't read from %s\n", gethostname_ex);
239 if (pclose(fghn) == -1)
240 printerr(1, "pclose failed, continue\n");
242 /* trim head/tail space */
243 while (is_space(*head))
246 tail = head + strlen(head);
248 printerr(0, "no output from %s\n", gethostname_ex);
251 while (is_space(*(tail - 1)))
254 printerr(0, "output are all space from %s\n", gethostname_ex);
259 /* start with '@' means error msg */
260 if (head[0] == '@') {
261 printerr(0, "error from %s: %s\n", gethostname_ex, &head[1]);
265 if (tail - head > namebuflen) {
266 printerr(0, "external hostname too long: %s\n", head);
270 printerr(2, "%s: net 0x%x, addr 0x%x => %s\n",
271 lnd, net, addr, head);
272 strcpy(namebuf, head);
276 struct convert_struct {
278 lnd_nid2hostname_t *nid2name;
281 static struct convert_struct converter[] = {
282 [0] = { "UNUSED0", NULL},
283 [QSWLND] = { "QSWLND", external_nid2hostname},
284 [SOCKLND] = { "SOCKLND", ipv4_nid2hostname },
285 [GMLND] = { "GMLND", external_nid2hostname},
286 [PTLLND] = { "PTLLND", external_nid2hostname },
287 [O2IBLND] = { "O2IBLND", ipv4_nid2hostname },
288 [CIBLND] = { "CIBLND", external_nid2hostname },
289 [OPENIBLND] = { "OPENIBLND",external_nid2hostname },
290 [IIBLND] = { "IIBLND", external_nid2hostname },
291 [LOLND] = { "LOLND", lolnd_nid2hostname },
292 [RALND] = { "RALND", external_nid2hostname },
293 [VIBLND] = { "VIBLND", external_nid2hostname },
294 [MXLND] = { "MXLND", external_nid2hostname },
297 #define LND_MAX (sizeof(converter) / sizeof(converter[0]))
299 int lnet_nid2hostname(lnet_nid_t nid, char *buf, int buflen)
301 uint32_t lnd, net, addr;
303 addr = LNET_NIDADDR(nid);
304 net = LNET_NIDNET(nid);
305 lnd = LNET_NETTYP(net);
307 if (lnd >= LND_MAX) {
308 printerr(0, "ERROR: Unrecognized LND %u\n", lnd);
312 if (converter[lnd].nid2name == NULL) {
313 printerr(0, "ERROR: %s converter not ready\n",
314 converter[lnd].name);
318 return converter[lnd].nid2name(converter[lnd].name, net, addr,
323 /****************************************
324 * lnet support routine *
325 * (from lnet/libcfs/nidstrings.c *
326 ****************************************/
328 #define LNET_NIDSTR_SIZE 32 /* size of each one (see below for usage) */
330 static int libcfs_lo_str2addr(char *str, int nob, uint32_t *addr);
331 static void libcfs_ip_addr2str(uint32_t addr, char *str);
332 static int libcfs_ip_str2addr(char *str, int nob, uint32_t *addr);
333 static void libcfs_decnum_addr2str(uint32_t addr, char *str);
334 static void libcfs_hexnum_addr2str(uint32_t addr, char *str);
335 static int libcfs_num_str2addr(char *str, int nob, uint32_t *addr);
341 void (*nf_addr2str)(uint32_t addr, char *str);
342 int (*nf_str2addr)(char *str, int nob, uint32_t *addr);
345 static struct netstrfns libcfs_netstrfns[] = {
346 {/* .nf_type */ LOLND,
348 /* .nf_modname */ "klolnd",
349 /* .nf_addr2str */ libcfs_decnum_addr2str,
350 /* .nf_str2addr */ libcfs_lo_str2addr},
351 {/* .nf_type */ SOCKLND,
352 /* .nf_name */ "tcp",
353 /* .nf_modname */ "ksocklnd",
354 /* .nf_addr2str */ libcfs_ip_addr2str,
355 /* .nf_str2addr */ libcfs_ip_str2addr},
356 {/* .nf_type */ O2IBLND,
357 /* .nf_name */ "o2ib",
358 /* .nf_modname */ "ko2iblnd",
359 /* .nf_addr2str */ libcfs_ip_addr2str,
360 /* .nf_str2addr */ libcfs_ip_str2addr},
361 {/* .nf_type */ CIBLND,
362 /* .nf_name */ "cib",
363 /* .nf_modname */ "kciblnd",
364 /* .nf_addr2str */ libcfs_ip_addr2str,
365 /* .nf_str2addr */ libcfs_ip_str2addr},
366 {/* .nf_type */ OPENIBLND,
367 /* .nf_name */ "openib",
368 /* .nf_modname */ "kopeniblnd",
369 /* .nf_addr2str */ libcfs_ip_addr2str,
370 /* .nf_str2addr */ libcfs_ip_str2addr},
371 {/* .nf_type */ IIBLND,
372 /* .nf_name */ "iib",
373 /* .nf_modname */ "kiiblnd",
374 /* .nf_addr2str */ libcfs_ip_addr2str,
375 /* .nf_str2addr */ libcfs_ip_str2addr},
376 {/* .nf_type */ VIBLND,
377 /* .nf_name */ "vib",
378 /* .nf_modname */ "kviblnd",
379 /* .nf_addr2str */ libcfs_ip_addr2str,
380 /* .nf_str2addr */ libcfs_ip_str2addr},
381 {/* .nf_type */ RALND,
383 /* .nf_modname */ "kralnd",
384 /* .nf_addr2str */ libcfs_ip_addr2str,
385 /* .nf_str2addr */ libcfs_ip_str2addr},
386 {/* .nf_type */ QSWLND,
387 /* .nf_name */ "elan",
388 /* .nf_modname */ "kqswlnd",
389 /* .nf_addr2str */ libcfs_decnum_addr2str,
390 /* .nf_str2addr */ libcfs_num_str2addr},
391 {/* .nf_type */ GMLND,
393 /* .nf_modname */ "kgmlnd",
394 /* .nf_addr2str */ libcfs_hexnum_addr2str,
395 /* .nf_str2addr */ libcfs_num_str2addr},
396 {/* .nf_type */ PTLLND,
397 /* .nf_name */ "ptl",
398 /* .nf_modname */ "kptllnd",
399 /* .nf_addr2str */ libcfs_decnum_addr2str,
400 /* .nf_str2addr */ libcfs_num_str2addr},
401 /* placeholder for net0 alias. It MUST BE THE LAST ENTRY */
405 const int libcfs_nnetstrfns = sizeof(libcfs_netstrfns)/sizeof(libcfs_netstrfns[0]);
408 libcfs_lo_str2addr(char *str, int nob, uint32_t *addr)
415 libcfs_ip_addr2str(uint32_t addr, char *str)
417 snprintf(str, LNET_NIDSTR_SIZE, "%u.%u.%u.%u",
418 (addr >> 24) & 0xff, (addr >> 16) & 0xff,
419 (addr >> 8) & 0xff, addr & 0xff);
422 /* CAVEAT EMPTOR XscanfX
423 * I use "%n" at the end of a sscanf format to detect trailing junk. However
424 * sscanf may return immediately if it sees the terminating '0' in a string, so
425 * I initialise the %n variable to the expected length. If sscanf sets it;
426 * fine, if it doesn't, then the scan ended at the end of the string, which is
430 libcfs_ip_str2addr(char *str, int nob, uint32_t *addr)
436 int n = nob; /* XscanfX */
439 if (sscanf(str, "%u.%u.%u.%u%n", &a, &b, &c, &d, &n) >= 4 &&
441 (a & ~0xff) == 0 && (b & ~0xff) == 0 &&
442 (c & ~0xff) == 0 && (d & ~0xff) == 0) {
443 *addr = ((a<<24)|(b<<16)|(c<<8)|d);
447 #ifdef HAVE_GETHOSTBYNAME
448 /* known hostname? */
449 if (('a' <= str[0] && str[0] <= 'z') ||
450 ('A' <= str[0] && str[0] <= 'Z')) {
453 tmp = malloc(nob + 1);
457 memcpy(tmp, str, nob);
460 he = gethostbyname(tmp);
466 uint32_t ip = *(uint32_t *)he->h_addr;
478 libcfs_decnum_addr2str(uint32_t addr, char *str)
480 snprintf(str, LNET_NIDSTR_SIZE, "%u", addr);
484 libcfs_hexnum_addr2str(uint32_t addr, char *str)
486 snprintf(str, LNET_NIDSTR_SIZE, "0x%x", addr);
490 libcfs_num_str2addr(char *str, int nob, uint32_t *addr)
495 if (sscanf(str, "0x%x%n", addr, &n) >= 1 && n == nob)
499 if (sscanf(str, "0X%x%n", addr, &n) >= 1 && n == nob)
503 if (sscanf(str, "%u%n", addr, &n) >= 1 && n == nob)
509 static struct netstrfns *
510 libcfs_lnd2netstrfns(int lnd)
515 for (i = 0; i < libcfs_nnetstrfns; i++)
516 if (lnd == libcfs_netstrfns[i].nf_type)
517 return &libcfs_netstrfns[i];
522 static struct netstrfns *
523 libcfs_str2net_internal(char *str, uint32_t *net)
525 struct netstrfns *nf;
530 for (i = 0; i < libcfs_nnetstrfns; i++) {
531 nf = &libcfs_netstrfns[i];
532 if (nf->nf_type >= 0 &&
533 !strncmp(str, nf->nf_name, strlen(nf->nf_name)))
537 if (i == libcfs_nnetstrfns)
540 nob = strlen(nf->nf_name);
542 if (strlen(str) == (unsigned int)nob) {
545 if (nf->nf_type == LOLND) /* net number not allowed */
550 if (sscanf(str, "%u%n", &netnum, &i) < 1 ||
551 i != (int)strlen(str))
555 *net = LNET_MKNET(nf->nf_type, netnum);
560 * this is duplication in libcfs, but somehow doesn't make into libcfs.a.
561 * remove it when libcfs get fixed.
564 libcfs_str2nid(const char *str)
566 const char *sep = strchr(str, '@');
567 struct netstrfns *nf;
572 nf = libcfs_str2net_internal(sep + 1, &net);
576 sep = str + strlen(str);
577 net = LNET_MKNET(SOCKLND, 0);
578 nf = libcfs_lnd2netstrfns(SOCKLND);
583 if (!nf->nf_str2addr(str, sep - str, &addr))
586 return LNET_MKNID(net, addr);
589 /****************************************
590 * user mapping database handling *
592 ****************************************/
594 #define MAPPING_GROW_SIZE 512
595 #define MAX_LINE_LEN 256
597 struct user_map_item {
598 char *principal; /* NULL means match all */
603 struct user_mapping {
605 struct user_map_item *items;
608 static struct user_mapping mapping = {0, NULL};
609 /* FIXME to be finished: monitor change of mapping database */
610 static int mapping_mtime = 0;
612 void cleanup_mapping(void)
615 for (; mapping.nitems > 0; mapping.nitems--)
616 if (mapping.items[mapping.nitems-1].principal)
617 free(mapping.items[mapping.nitems-1].principal);
620 mapping.items = NULL;
624 static int grow_mapping(int nitems)
626 struct user_map_item *new;
627 int oldsize, newsize;
629 oldsize = (mapping.nitems * sizeof(struct user_map_item) +
630 MAPPING_GROW_SIZE - 1) / MAPPING_GROW_SIZE;
631 newsize = (nitems * sizeof(struct user_map_item) +
632 MAPPING_GROW_SIZE - 1) / MAPPING_GROW_SIZE;
633 while (newsize <= oldsize)
636 newsize *= MAPPING_GROW_SIZE;
637 new = malloc(newsize);
639 printerr(0, "can't alloc mapping size %d\n", newsize);
644 memcpy(new, mapping.items,
645 mapping.nitems * sizeof(struct user_map_item));
652 uid_t parse_uid(char *uidstr)
658 pw = getpwnam(uidstr);
662 uid = strtol(uidstr, &p, 0);
669 static int read_mapping_db(void)
671 char princ[MAX_LINE_LEN];
672 char nid_str[MAX_LINE_LEN];
673 char dest[MAX_LINE_LEN];
674 char linebuf[MAX_LINE_LEN];
680 /* cleanup old mappings */
683 f = fopen(MAPPING_DATABASE_FILE, "r");
685 printerr(0, "can't open mapping database: %s\n",
686 MAPPING_DATABASE_FILE);
690 while ((line = fgets(linebuf, MAX_LINE_LEN, f)) != NULL) {
693 if (strlen(line) >= MAX_LINE_LEN) {
694 printerr(0, "invalid mapping db: line too long (%d)\n",
699 if (sscanf(line, "%s %s %s", princ, nid_str, dest) != 3) {
700 printerr(0, "mapping db: syntax error\n");
704 if (!strcmp(princ, "*")) {
707 name = strdup(princ);
709 printerr(0, "fail to dup str %s\n", princ);
714 if (!strcmp(nid_str, "*")) {
717 nid = libcfs_str2nid(nid_str);
718 if (nid == LNET_NID_ANY) {
719 printerr(0, "fail to parse nid %s\n", nid_str);
726 dest_uid = parse_uid(dest);
727 if (dest_uid == -1) {
728 printerr(0, "no valid user: %s\n", dest);
734 if (grow_mapping(mapping.nitems + 1)) {
735 printerr(0, "fail to grow mapping to %d\n",
743 mapping.items[mapping.nitems].principal = name;
744 mapping.items[mapping.nitems].nid = nid;
745 mapping.items[mapping.nitems].uid = dest_uid;
747 printerr(1, "add mapping: %s(%s/0x%llx) ==> %d\n",
748 name, nid_str, nid, dest_uid);
755 static inline int mapping_changed(void)
759 if (stat(MAPPING_DATABASE_FILE, &st) == -1) {
760 /* stat failed, treat it like doesn't exist or be removed */
761 if (mapping_mtime == 0) {
764 printerr(0, "Warning: stat %s failed: %s\n",
765 MAPPING_DATABASE_FILE, strerror(errno));
772 if (st.st_mtime != mapping_mtime) {
773 mapping_mtime = st.st_mtime;
780 int lookup_mapping(char *princ, lnet_nid_t nid, uid_t *uid)
786 /* FIXME race condition here */
787 if (mapping_changed()) {
788 if (read_mapping_db())
789 printerr(0, "all remote users will be denied\n");
792 for (n = 0; n < mapping.nitems; n++) {
793 struct user_map_item *entry = &mapping.items[n];
795 if (entry->nid != LNET_NID_ANY && entry->nid != nid)
797 if (!entry->principal || !strcasecmp(entry->principal, princ)) {
798 printerr(1, "found mapping: %s ==> %d\n",
805 printerr(2, "no mapping for %s/%#Lx\n", princ, nid);