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 /****************************************
61 ****************************************/
63 static struct __sem_s {
68 [GSSD_CLI] = { "client", 0x3a92d473, 0 },
69 [GSSD_SVC] = { "server", 0x3b92d473, 0 },
72 void gssd_init_unique(int type)
74 struct __sem_s *sem = &sems[type];
77 assert(type == GSSD_CLI || type == GSSD_SVC);
80 sem->sem_id = semget(sem->sem_key, 1, IPC_CREAT | IPC_EXCL | 0700);
81 if (sem->sem_id == -1) {
82 if (errno != EEXIST) {
83 printerr(0, "Create sem: %s\n", strerror(errno));
87 /* already exist. Note there's still a small window racing
88 * with other processes, due to the stupid semaphore semantics.
90 sem->sem_id = semget(sem->sem_key, 0, 0700);
91 if (sem->sem_id == -1) {
92 if (errno == ENOENT) {
93 printerr(0, "another instance just exit, "
98 printerr(0, "Obtain sem: %s\n", strerror(errno));
104 if (semctl(sem->sem_id, 0, SETVAL, val) == -1) {
105 printerr(0, "Initialize sem: %s\n",
113 sembuf.sem_flg = IPC_NOWAIT | SEM_UNDO;
115 if (semop(sem->sem_id, &sembuf, 1) != 0) {
116 if (errno == EAGAIN) {
117 printerr(0, "Another instance is running, exit\n");
120 printerr(0, "Grab sem: %s\n", strerror(errno));
124 printerr(2, "Successfully created %s global identity\n", sem->name);
127 void gssd_exit_unique(int type)
129 assert(type == GSSD_CLI || type == GSSD_SVC);
132 * do nothing. we can't remove the sem here, otherwise the race
133 * window would be much bigger. So it's sad we have to leave the
134 * sem in the system forever.
138 /****************************************
139 * client side resolvation: *
140 * lnd/netid/nid => hostname *
141 ****************************************/
143 char gethostname_ex[PATH_MAX] = GSSD_DEFAULT_GETHOSTNAME_EX;
145 typedef int lnd_nid2hostname_t(char *lnd, uint32_t net, uint32_t addr,
146 char *buf, int buflen);
148 /* FIXME what about IPv6? */
150 int ipv4_nid2hostname(char *lnd, uint32_t net, uint32_t addr,
151 char *buf, int buflen)
156 ent = gethostbyaddr(&addr, sizeof(addr), AF_INET);
158 printerr(0, "%s: can't resolve 0x%x\n", lnd, addr);
161 if (strlen(ent->h_name) >= buflen) {
162 printerr(0, "%s: name too long: %s\n", lnd, ent->h_name);
165 strcpy(buf, ent->h_name);
167 printerr(2, "%s: net 0x%x, addr 0x%x => %s\n",
168 lnd, net, addr, buf);
173 int lolnd_nid2hostname(char *lnd, uint32_t net, uint32_t addr,
174 char *buf, int buflen)
180 printerr(0, "%s: addr is 0x%x, we expect 0\n", lnd, addr);
185 printerr(0, "%s: failed obtain local machine name\n", lnd);
189 ent = gethostbyname(uts.nodename);
191 printerr(0, "%s: failed obtain canonical name of %s\n",
196 if (strlen(ent->h_name) >= buflen) {
197 printerr(0, "%s: name too long: %s\n", lnd, ent->h_name);
200 strcpy(buf, ent->h_name);
202 printerr(3, "%s: addr 0x%x => %s\n", lnd, addr, buf);
206 static int is_space(char c)
208 return (c == ' ' || c == '\t' || c == '\n');
212 int external_nid2hostname(char *lnd, uint32_t net, uint32_t addr,
213 char *namebuf, int namebuflen)
215 const int bufsize = PATH_MAX + 256;
216 char buf[bufsize], *head, *tail;
219 sprintf(buf, "%s %s 0x%x 0x%x", gethostname_ex, lnd, net, addr);
220 printerr(2, "cmd: %s\n", buf);
222 fghn = popen(buf, "r");
224 printerr(0, "failed to call %s\n", gethostname_ex);
228 head = fgets(buf, bufsize, fghn);
230 printerr(0, "can't read from %s\n", gethostname_ex);
233 if (pclose(fghn) == -1)
234 printerr(1, "pclose failed, continue\n");
236 /* trim head/tail space */
237 while (is_space(*head))
240 tail = head + strlen(head);
242 printerr(0, "no output from %s\n", gethostname_ex);
245 while (is_space(*(tail - 1)))
248 printerr(0, "output are all space from %s\n", gethostname_ex);
253 /* start with '@' means error msg */
254 if (head[0] == '@') {
255 printerr(0, "error from %s: %s\n", gethostname_ex, &head[1]);
259 if (tail - head > namebuflen) {
260 printerr(0, "external hostname too long: %s\n", head);
264 printerr(2, "%s: net 0x%x, addr 0x%x => %s\n",
265 lnd, net, addr, head);
266 strcpy(namebuf, head);
272 lnd_nid2hostname_t *nid2name;
273 } converter[LND_ENUM_END_MARKER] = {
275 [QSWLND] = { "QSWLND", external_nid2hostname},
276 [SOCKLND] = { "SOCKLND", ipv4_nid2hostname },
277 [GMLND] = { "GMLND", external_nid2hostname},
278 [PTLLND] = { "PTLLND", external_nid2hostname },
279 [O2IBLND] = { "O2IBLND", ipv4_nid2hostname },
280 [CIBLND] = { "CIBLND", external_nid2hostname },
281 [OPENIBLND] = { "OPENIBLND",external_nid2hostname },
282 [IIBLND] = { "IIBLND", external_nid2hostname },
283 [LOLND] = { "LOLND", lolnd_nid2hostname },
284 [RALND] = { "RALND", external_nid2hostname },
285 [VIBLND] = { "VIBLND", external_nid2hostname },
288 int lnet_nid2hostname(lnet_nid_t nid, char *buf, int buflen)
290 uint32_t lnd, net, addr;
292 addr = LNET_NIDADDR(nid);
293 net = LNET_NIDNET(nid);
294 lnd = LNET_NETTYP(net);
296 if (lnd >= LND_ENUM_END_MARKER) {
297 printerr(0, "ERROR: Unrecognized LND %u\n", lnd);
301 if (converter[lnd].nid2name == NULL) {
302 printerr(0, "ERROR: %s converter not ready\n",
303 converter[lnd].name);
307 return converter[lnd].nid2name(converter[lnd].name, net, addr,
312 /****************************************
313 * lnet support routine *
314 * (from lnet/libcfs/nidstrings.c *
315 ****************************************/
317 #define LNET_NIDSTR_SIZE 32 /* size of each one (see below for usage) */
319 static int libcfs_lo_str2addr(char *str, int nob, uint32_t *addr);
320 static void libcfs_ip_addr2str(uint32_t addr, char *str);
321 static int libcfs_ip_str2addr(char *str, int nob, uint32_t *addr);
322 static void libcfs_decnum_addr2str(uint32_t addr, char *str);
323 static void libcfs_hexnum_addr2str(uint32_t addr, char *str);
324 static int libcfs_num_str2addr(char *str, int nob, uint32_t *addr);
330 void (*nf_addr2str)(uint32_t addr, char *str);
331 int (*nf_str2addr)(char *str, int nob, uint32_t *addr);
334 static struct netstrfns libcfs_netstrfns[] = {
335 {/* .nf_type */ LOLND,
337 /* .nf_modname */ "klolnd",
338 /* .nf_addr2str */ libcfs_decnum_addr2str,
339 /* .nf_str2addr */ libcfs_lo_str2addr},
340 {/* .nf_type */ SOCKLND,
341 /* .nf_name */ "tcp",
342 /* .nf_modname */ "ksocklnd",
343 /* .nf_addr2str */ libcfs_ip_addr2str,
344 /* .nf_str2addr */ libcfs_ip_str2addr},
345 {/* .nf_type */ O2IBLND,
346 /* .nf_name */ "o2ib",
347 /* .nf_modname */ "ko2iblnd",
348 /* .nf_addr2str */ libcfs_ip_addr2str,
349 /* .nf_str2addr */ libcfs_ip_str2addr},
350 {/* .nf_type */ CIBLND,
351 /* .nf_name */ "cib",
352 /* .nf_modname */ "kciblnd",
353 /* .nf_addr2str */ libcfs_ip_addr2str,
354 /* .nf_str2addr */ libcfs_ip_str2addr},
355 {/* .nf_type */ OPENIBLND,
356 /* .nf_name */ "openib",
357 /* .nf_modname */ "kopeniblnd",
358 /* .nf_addr2str */ libcfs_ip_addr2str,
359 /* .nf_str2addr */ libcfs_ip_str2addr},
360 {/* .nf_type */ IIBLND,
361 /* .nf_name */ "iib",
362 /* .nf_modname */ "kiiblnd",
363 /* .nf_addr2str */ libcfs_ip_addr2str,
364 /* .nf_str2addr */ libcfs_ip_str2addr},
365 {/* .nf_type */ VIBLND,
366 /* .nf_name */ "vib",
367 /* .nf_modname */ "kviblnd",
368 /* .nf_addr2str */ libcfs_ip_addr2str,
369 /* .nf_str2addr */ libcfs_ip_str2addr},
370 {/* .nf_type */ RALND,
372 /* .nf_modname */ "kralnd",
373 /* .nf_addr2str */ libcfs_ip_addr2str,
374 /* .nf_str2addr */ libcfs_ip_str2addr},
375 {/* .nf_type */ QSWLND,
376 /* .nf_name */ "elan",
377 /* .nf_modname */ "kqswlnd",
378 /* .nf_addr2str */ libcfs_decnum_addr2str,
379 /* .nf_str2addr */ libcfs_num_str2addr},
380 {/* .nf_type */ GMLND,
382 /* .nf_modname */ "kgmlnd",
383 /* .nf_addr2str */ libcfs_hexnum_addr2str,
384 /* .nf_str2addr */ libcfs_num_str2addr},
385 {/* .nf_type */ PTLLND,
386 /* .nf_name */ "ptl",
387 /* .nf_modname */ "kptllnd",
388 /* .nf_addr2str */ libcfs_decnum_addr2str,
389 /* .nf_str2addr */ libcfs_num_str2addr},
390 /* placeholder for net0 alias. It MUST BE THE LAST ENTRY */
394 const int libcfs_nnetstrfns = sizeof(libcfs_netstrfns)/sizeof(libcfs_netstrfns[0]);
397 libcfs_lo_str2addr(char *str, int nob, uint32_t *addr)
404 libcfs_ip_addr2str(uint32_t addr, char *str)
406 snprintf(str, LNET_NIDSTR_SIZE, "%u.%u.%u.%u",
407 (addr >> 24) & 0xff, (addr >> 16) & 0xff,
408 (addr >> 8) & 0xff, addr & 0xff);
411 /* CAVEAT EMPTOR XscanfX
412 * I use "%n" at the end of a sscanf format to detect trailing junk. However
413 * sscanf may return immediately if it sees the terminating '0' in a string, so
414 * I initialise the %n variable to the expected length. If sscanf sets it;
415 * fine, if it doesn't, then the scan ended at the end of the string, which is
419 libcfs_ip_str2addr(char *str, int nob, uint32_t *addr)
425 int n = nob; /* XscanfX */
428 if (sscanf(str, "%u.%u.%u.%u%n", &a, &b, &c, &d, &n) >= 4 &&
430 (a & ~0xff) == 0 && (b & ~0xff) == 0 &&
431 (c & ~0xff) == 0 && (d & ~0xff) == 0) {
432 *addr = ((a<<24)|(b<<16)|(c<<8)|d);
436 #ifdef HAVE_GETHOSTBYNAME
437 /* known hostname? */
438 if (('a' <= str[0] && str[0] <= 'z') ||
439 ('A' <= str[0] && str[0] <= 'Z')) {
442 tmp = malloc(nob + 1);
446 memcpy(tmp, str, nob);
449 he = gethostbyname(tmp);
455 uint32_t ip = *(uint32_t *)he->h_addr;
467 libcfs_decnum_addr2str(uint32_t addr, char *str)
469 snprintf(str, LNET_NIDSTR_SIZE, "%u", addr);
473 libcfs_hexnum_addr2str(uint32_t addr, char *str)
475 snprintf(str, LNET_NIDSTR_SIZE, "0x%x", addr);
479 libcfs_num_str2addr(char *str, int nob, uint32_t *addr)
484 if (sscanf(str, "0x%x%n", addr, &n) >= 1 && n == nob)
488 if (sscanf(str, "0X%x%n", addr, &n) >= 1 && n == nob)
492 if (sscanf(str, "%u%n", addr, &n) >= 1 && n == nob)
498 static struct netstrfns *
499 libcfs_lnd2netstrfns(int lnd)
504 for (i = 0; i < libcfs_nnetstrfns; i++)
505 if (lnd == libcfs_netstrfns[i].nf_type)
506 return &libcfs_netstrfns[i];
511 static struct netstrfns *
512 libcfs_str2net_internal(char *str, uint32_t *net)
514 struct netstrfns *nf;
519 for (i = 0; i < libcfs_nnetstrfns; i++) {
520 nf = &libcfs_netstrfns[i];
521 if (nf->nf_type >= 0 &&
522 !strncmp(str, nf->nf_name, strlen(nf->nf_name)))
526 if (i == libcfs_nnetstrfns)
529 nob = strlen(nf->nf_name);
531 if (strlen(str) == (unsigned int)nob) {
534 if (nf->nf_type == LOLND) /* net number not allowed */
539 if (sscanf(str, "%u%n", &netnum, &i) < 1 ||
540 i != (int)strlen(str))
544 *net = LNET_MKNET(nf->nf_type, netnum);
549 libcfs_str2nid(char *str)
551 char *sep = strchr(str, '@');
552 struct netstrfns *nf;
557 nf = libcfs_str2net_internal(sep + 1, &net);
561 sep = str + strlen(str);
562 net = LNET_MKNET(SOCKLND, 0);
563 nf = libcfs_lnd2netstrfns(SOCKLND);
568 if (!nf->nf_str2addr(str, sep - str, &addr))
571 return LNET_MKNID(net, addr);
574 /****************************************
575 * user mapping database handling *
577 ****************************************/
579 #define MAPPING_GROW_SIZE 512
580 #define MAX_LINE_LEN 256
582 struct user_map_item {
583 char *principal; /* NULL means match all, will cause multi->single mapped, FORBID */
588 struct user_mapping {
590 struct user_map_item *items;
593 static struct user_mapping mapping = {0, NULL};
594 /* FIXME to be finished: monitor change of mapping database */
595 static int mapping_mtime = 0;
597 void cleanup_mapping(void)
600 for (; mapping.nitems > 0; mapping.nitems--)
601 free(mapping.items[mapping.nitems - 1].principal);
603 mapping.items = NULL;
607 static int grow_mapping(int nitems)
609 struct user_map_item *new;
610 int oldsize, newsize;
612 oldsize = (mapping.nitems * sizeof(struct user_map_item) +
613 MAPPING_GROW_SIZE - 1) / MAPPING_GROW_SIZE;
614 newsize = (nitems * sizeof(struct user_map_item) +
615 MAPPING_GROW_SIZE - 1) / MAPPING_GROW_SIZE;
616 while (newsize <= oldsize)
619 newsize *= MAPPING_GROW_SIZE;
620 new = malloc(newsize);
622 printerr(0, "can't alloc mapping size %d\n", newsize);
627 memcpy(new, mapping.items, mapping.nitems * sizeof(struct user_map_item));
634 uid_t parse_uid(char *uidstr)
640 pw = getpwnam(uidstr);
644 uid = strtol(uidstr, &p, 0);
651 static int read_mapping_db(void)
653 char princ[MAX_LINE_LEN];
654 char nid_str[MAX_LINE_LEN];
655 char dest[MAX_LINE_LEN];
656 char linebuf[MAX_LINE_LEN];
662 /* cleanup old mappings */
665 f = fopen(MAPPING_DATABASE_FILE, "r");
667 printerr(0, "can't open mapping database: %s\n",
668 MAPPING_DATABASE_FILE);
672 while ((line = fgets(linebuf, MAX_LINE_LEN, f)) != NULL) {
675 if (strlen(line) >= MAX_LINE_LEN) {
676 printerr(0, "invalid mapping db: line too long (%d)\n",
681 if (sscanf(line, "%s %s %s", princ, nid_str, dest) != 3) {
682 printerr(0, "mapping db: syntax error\n");
686 if (!strcmp(princ, "*")) {
687 printerr(0, "NOT permit \"*\" princ, it will cause multi->single mapped\n");
690 name = strdup(princ);
692 printerr(0, "fail to dup str %s\n", princ);
697 if (!strcmp(nid_str, "*")) {
700 nid = libcfs_str2nid(nid_str);
701 if (nid == LNET_NID_ANY) {
702 printerr(0, "fail to parse nid %s\n", nid_str);
708 dest_uid = parse_uid(dest);
709 if (dest_uid == -1) {
710 printerr(0, "no valid user: %s\n", dest);
715 if (grow_mapping(mapping.nitems + 1)) {
716 printerr(0, "fail to grow mapping to %d\n",
723 mapping.items[mapping.nitems].principal = name;
724 mapping.items[mapping.nitems].nid = nid;
725 mapping.items[mapping.nitems].uid = dest_uid;
727 printerr(1, "add mapping: %s(%s/0x%llx) ==> %d\n",
728 name, nid_str, nid, dest_uid);
735 static inline int mapping_changed(void)
739 if (stat(MAPPING_DATABASE_FILE, &st) == -1) {
740 /* stat failed, treat it like doesn't exist or be removed */
741 if (mapping_mtime == 0) {
744 printerr(0, "Warning: stat %s failed: %s\n",
745 MAPPING_DATABASE_FILE, strerror(errno));
752 if (st.st_mtime != mapping_mtime) {
753 mapping_mtime = st.st_mtime;
760 int lookup_mapping(char *princ, lnet_nid_t nid, uid_t *uid)
766 /* FIXME race condition here */
767 if (mapping_changed()) {
768 if (read_mapping_db())
769 printerr(0, "all remote users will be denied\n");
772 for (n = 0; n < mapping.nitems; n++) {
773 struct user_map_item *entry = &mapping.items[n];
775 if (entry->nid != LNET_NID_ANY && entry->nid != nid)
777 if (!strcasecmp(entry->principal, princ)) {
778 printerr(1, "found mapping: %s ==> %d\n",
785 printerr(2, "no mapping for %s/%#Lx\n", princ, nid);