support/export/client.c

   1 /*
   2  * support/export/client.c
   3  *
   4  * Maintain list of nfsd clients.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include "config.h"
  10
  11 #include <sys/types.h>
  12 #include <netinet/in.h>
  13 #include <arpa/inet.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <netdb.h>
  17 #include "xmalloc.h"
  18 #include "misc.h"
  19 #include "nfslib.h"
  20 #include "exportfs.h"
  21
  22 /* netgroup stuff never seems to be defined in any header file. Linux is
  23  * not alone in this.
  24  */
  25 #if !defined(__GLIBC__) || __GLIBC__ < 2
  26 extern int      innetgr(char *netgr, char *host, char *, char *);
  27 #endif
  28 static void     client_init(nfs_client *clp, const char *hname,
  29                                         struct hostent *hp);
  30 static int      client_checkaddr(nfs_client *clp, struct in_addr addr);
  31
  32 nfs_client      *clientlist[MCL_MAXTYPES] = { NULL, };
  33
  34
  35 nfs_client *
  36 client_lookup(char *hname)
  37 {
  38         nfs_client      *clp = NULL;
  39         int             htype;
  40         struct hostent  *hp = NULL;
  41
  42         htype = client_gettype(hname);
  43
  44         if (htype == MCL_FQDN) {
  45                 struct hostent *hp2;
  46                 hp = gethostbyname(hname);
  47                 if (hp == NULL || hp->h_addrtype != AF_INET) {
  48                         xlog(L_ERROR, "%s has non-inet addr", hname);
  49                         return NULL;
  50                 }
  51                 /* make sure we have canonical name */
  52                 hp2 = hostent_dup(hp);
  53                 hp = gethostbyaddr(hp2->h_addr, hp2->h_length,
  54                                    hp2->h_addrtype);
  55                 if (hp) {
  56                         free(hp2);
  57                         hp = hostent_dup(hp);
  58                 } else
  59                         hp = hp2;
  60
  61                 hname = (char *) hp->h_name;
  62
  63                 for (clp = clientlist[htype]; clp; clp = clp->m_next) {
  64                         if (client_check(clp, hp))
  65                                 break;
  66                 }
  67         } else {
  68                 for (clp = clientlist[htype]; clp; clp = clp->m_next) {
  69                         if (strcmp(hname, clp->m_hostname)==0)
  70                                 break;
  71                 }
  72         }
  73
  74         if (!clp) {
  75                 clp = (nfs_client *) xmalloc(sizeof(*clp));
  76                 memset(clp, 0, sizeof(*clp));
  77                 clp->m_type = htype;
  78                 client_init(clp, hname, NULL);
  79                 client_add(clp);
  80         }
  81
  82         if (htype == MCL_FQDN && clp->m_naddr == 0 && hp != NULL) {
  83                 char    **ap = hp->h_addr_list;
  84                 int     i;
  85
  86                 for (i = 0; *ap && i < NFSCLNT_ADDRMAX; i++, ap++)
  87                         clp->m_addrlist[i] = *(struct in_addr *)*ap;
  88                 clp->m_naddr = i;
  89         }
  90
  91         if (hp)
  92                 free (hp);
  93
  94         return clp;
  95 }
  96
  97 nfs_client *
  98 client_dup(nfs_client *clp, struct hostent *hp)
  99 {
 100         nfs_client              *new;
 101
 102         new = (nfs_client *) xmalloc(sizeof(*new));
 103         memcpy(new, clp, sizeof(*new));
 104         new->m_type = MCL_FQDN;
 105
 106         client_init(new, (char *) hp->h_name, hp);
 107         client_add(new);
 108         return new;
 109 }
 110
 111 static void
 112 client_init(nfs_client *clp, const char *hname, struct hostent *hp)
 113 {
 114         if (hp) {
 115                 strncpy(clp->m_hostname, hp->h_name,
 116                         sizeof (clp->m_hostname) -  1);
 117         } else {
 118                 strncpy(clp->m_hostname, hname,
 119                         sizeof (clp->m_hostname) - 1);
 120         }
 121         clp->m_hostname[sizeof (clp->m_hostname) - 1] = '\0';
 122
 123         clp->m_exported = 0;
 124         clp->m_count = 0;
 125
 126         if (clp->m_type == MCL_SUBNETWORK) {
 127                 char    *cp = strchr(clp->m_hostname, '/');
 128
 129                 *cp = '\0';
 130                 clp->m_addrlist[0].s_addr = inet_addr(clp->m_hostname);
 131                 if (strchr(cp + 1, '.')) {
 132                         clp->m_addrlist[1].s_addr = inet_addr(cp+1);
 133                 }
 134                 else {
 135                         int netmask = atoi(cp + 1);
 136                         if (0 < netmask && netmask <= 32) {
 137                                 clp->m_addrlist[1].s_addr =
 138                                         htonl ((uint32_t) ~0 << (32 - netmask));
 139                         }
 140                         else {
 141                                 xlog(L_FATAL, "invalid netmask `%s' for %s",
 142                                      cp + 1, clp->m_hostname);
 143                         }
 144                 }
 145                 *cp = '/';
 146                 clp->m_naddr = 0;
 147         } else if (!hp) {
 148                 clp->m_naddr = 0;
 149         } else {
 150                 char    **ap = hp->h_addr_list;
 151                 int     i;
 152
 153                 for (i = 0; *ap && i < NFSCLNT_ADDRMAX; i++, ap++) {
 154                         clp->m_addrlist[i] = *(struct in_addr *)*ap;
 155                 }
 156                 clp->m_naddr = i;
 157         }
 158 }
 159
 160 void
 161 client_add(nfs_client *clp)
 162 {
 163         nfs_client      **cpp;
 164
 165         if (clp->m_type < 0 || clp->m_type >= MCL_MAXTYPES)
 166                 xlog(L_FATAL, "unknown client type in client_add");
 167         cpp = clientlist + clp->m_type;
 168         while (*cpp)
 169                 cpp = &((*cpp)->m_next);
 170         clp->m_next = NULL;
 171         *cpp = clp;
 172 }
 173
 174 void
 175 client_release(nfs_client *clp)
 176 {
 177         if (clp->m_count <= 0)
 178                 xlog(L_FATAL, "client_free: m_count <= 0!");
 179         clp->m_count--;
 180 }
 181
 182 void
 183 client_freeall(void)
 184 {
 185         nfs_client      *clp, **head;
 186         int             i;
 187
 188         for (i = 0; i < MCL_MAXTYPES; i++) {
 189                 head = clientlist + i;
 190                 while (*head) {
 191                         *head = (clp = *head)->m_next;
 192                         xfree(clp);
 193                 }
 194         }
 195 }
 196
 197 nfs_client *
 198 client_find(struct hostent *hp)
 199 {
 200         nfs_client      *clp;
 201         int             i;
 202
 203         for (i = 0; i < MCL_MAXTYPES; i++) {
 204                 for (clp = clientlist[i]; clp; clp = clp->m_next) {
 205                         if (!client_check(clp, hp))
 206                                 continue;
 207 #ifdef notdef
 208                         if (clp->m_type == MCL_FQDN)
 209                                 return clp;
 210                         return client_dup(clp, hp);
 211 #else
 212                         return clp;
 213 #endif
 214                 }
 215         }
 216         return NULL;
 217 }
 218
 219 /*
 220  * Match a host (given its hostent record) to a client record. This
 221  * is usually called from mountd.
 222  */
 223 int
 224 client_check(nfs_client *clp, struct hostent *hp)
 225 {
 226         char    *hname = (char *) hp->h_name;
 227         char    *cname = clp->m_hostname;
 228         char    **ap;
 229
 230         switch (clp->m_type) {
 231         case MCL_FQDN:
 232         case MCL_SUBNETWORK:
 233                 for (ap = hp->h_addr_list; *ap; ap++) {
 234                         if (client_checkaddr(clp, *(struct in_addr *) *ap))
 235                                 return 1;
 236                 }
 237                 return 0;
 238         case MCL_WILDCARD:
 239                 if (wildmat(hname, cname))
 240                         return 1;
 241                 else {
 242                         for (ap = hp->h_aliases; *ap; ap++)
 243                                 if (wildmat(*ap, cname))
 244                                         return 1;
 245                 }
 246                 return 0;
 247         case MCL_NETGROUP:
 248 #ifdef HAVE_INNETGR
 249                 {
 250                         char    *dot;
 251                         int     match;
 252                         struct hostent *nhp = NULL;
 253                         struct sockaddr_in addr;
 254
 255                         /* First, try to match the hostname without
 256                          * splitting off the domain */
 257                         if (innetgr(cname+1, hname, NULL, NULL))
 258                                 return 1;
 259
 260                         /* If hname is ip address convert to FQDN */
 261                         if (inet_aton(hname, &addr.sin_addr) &&
 262                            (nhp = gethostbyaddr((const char *)&(addr.sin_addr),
 263                             sizeof(addr.sin_addr), AF_INET))) {
 264                                 hname = (char *)nhp->h_name;
 265                                 if (innetgr(cname+1, hname, NULL, NULL))
 266                                         return 1;
 267                         }
 268
 269                         /* Okay, strip off the domain (if we have one) */
 270                         if ((dot = strchr(hname, '.')) == NULL)
 271                                 return 0;
 272
 273                         *dot = '\0';
 274                         match = innetgr(cname+1, hname, NULL, NULL);
 275                         *dot = '.';
 276
 277                         return match;
 278                 }
 279 #else
 280                 return 0;
 281 #endif
 282         case MCL_ANONYMOUS:
 283                 return 1;
 284         default:
 285                 xlog(L_FATAL, "internal: bad client type %d", clp->m_type);
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int
 292 client_checkaddr(nfs_client *clp, struct in_addr addr)
 293 {
 294         int     i;
 295
 296         switch (clp->m_type) {
 297         case MCL_FQDN:
 298                 for (i = 0; i < clp->m_naddr; i++) {
 299                         if (clp->m_addrlist[i].s_addr == addr.s_addr)
 300                                 return 1;
 301                 }
 302                 return 0;
 303         case MCL_SUBNETWORK:
 304                 return !((clp->m_addrlist[0].s_addr ^ addr.s_addr)
 305                         & clp->m_addrlist[1].s_addr);
 306         }
 307         return 0;
 308 }
 309
 310 int
 311 client_gettype(char *ident)
 312 {
 313         char    *sp;
 314
 315         if (ident[0] == '\0' || strcmp(ident, "*")==0)
 316                 return MCL_ANONYMOUS;
 317         if (ident[0] == '@') {
 318 #ifndef HAVE_INNETGR
 319                 xlog(L_WARNING, "netgroup support not compiled in");
 320 #endif
 321                 return MCL_NETGROUP;
 322         }
 323         for (sp = ident; *sp; sp++) {
 324                 if (*sp == '*' || *sp == '?' || *sp == '[')
 325                         return MCL_WILDCARD;
 326                 if (*sp == '/')
 327                         return MCL_SUBNETWORK;
 328                 if (*sp == '\\' && sp[1])
 329                         sp++;
 330         }
 331         return MCL_FQDN;
 332 }