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                 hp = gethostbyname(hname);
  46                 if (hp == NULL || hp->h_addrtype != AF_INET) {
  47                         xlog(L_ERROR, "%s has non-inet addr", hname);
  48                         return NULL;
  49                 }
  50                 hp = hostent_dup (hp);
  51                 hname = (char *) hp->h_name;
  52
  53                 for (clp = clientlist[htype]; clp; clp = clp->m_next) {
  54                         if (client_check(clp, hp))
  55                                 break;
  56                 }
  57         } else {
  58                 for (clp = clientlist[htype]; clp; clp = clp->m_next) {
  59                         if (strcmp(hname, clp->m_hostname)==0)
  60                                 break;
  61                 }
  62         }
  63
  64         if (!clp) {
  65                 clp = (nfs_client *) xmalloc(sizeof(*clp));
  66                 memset(clp, 0, sizeof(*clp));
  67                 clp->m_type = htype;
  68                 client_init(clp, hname, NULL);
  69                 client_add(clp);
  70         }
  71
  72         if (htype == MCL_FQDN && clp->m_naddr == 0 && hp != NULL) {
  73                 char    **ap = hp->h_addr_list;
  74                 int     i;
  75
  76                 for (i = 0; *ap && i < NFSCLNT_ADDRMAX; i++, ap++)
  77                         clp->m_addrlist[i] = *(struct in_addr *)*ap;
  78                 clp->m_naddr = i;
  79         }
  80
  81         if (hp)
  82                 free (hp);
  83
  84         return clp;
  85 }
  86
  87 nfs_client *
  88 client_dup(nfs_client *clp, struct hostent *hp)
  89 {
  90         nfs_client              *new;
  91
  92         new = (nfs_client *) xmalloc(sizeof(*new));
  93         memcpy(new, clp, sizeof(*new));
  94         new->m_type = MCL_FQDN;
  95
  96         client_init(new, (char *) hp->h_name, hp);
  97         client_add(new);
  98         return new;
  99 }
 100
 101 static void
 102 client_init(nfs_client *clp, const char *hname, struct hostent *hp)
 103 {
 104         if (hp) {
 105                 strncpy(clp->m_hostname, hp->h_name,
 106                         sizeof (clp->m_hostname) -  1);
 107         } else {
 108                 strncpy(clp->m_hostname, hname,
 109                         sizeof (clp->m_hostname) - 1);
 110         }
 111         clp->m_hostname[sizeof (clp->m_hostname) - 1] = '\0';
 112
 113         clp->m_exported = 0;
 114         clp->m_count = 0;
 115
 116         if (clp->m_type == MCL_SUBNETWORK) {
 117                 char    *cp = strchr(clp->m_hostname, '/');
 118
 119                 *cp = '\0';
 120                 clp->m_addrlist[0].s_addr = inet_addr(clp->m_hostname);
 121                 if (strchr(cp + 1, '.')) {
 122                         clp->m_addrlist[1].s_addr = inet_addr(cp+1);
 123                 }
 124                 else {
 125                         int netmask = atoi(cp + 1);
 126                         if (0 < netmask && netmask <= 32) {
 127                                 clp->m_addrlist[1].s_addr =
 128                                         htonl ((uint32_t) ~0 << (32 - netmask));
 129                         }
 130                         else {
 131                                 xlog(L_FATAL, "invalid netmask `%s' for %s",
 132                                      cp + 1, clp->m_hostname);
 133                         }
 134                 }
 135                 *cp = '/';
 136                 clp->m_naddr = 0;
 137         } else if (!hp) {
 138                 clp->m_naddr = 0;
 139         } else {
 140                 char    **ap = hp->h_addr_list;
 141                 int     i;
 142
 143                 for (i = 0; *ap && i < NFSCLNT_ADDRMAX; i++, ap++) {
 144                         clp->m_addrlist[i] = *(struct in_addr *)*ap;
 145                 }
 146                 clp->m_naddr = i;
 147         }
 148 }
 149
 150 void
 151 client_add(nfs_client *clp)
 152 {
 153         nfs_client      **cpp;
 154
 155         if (clp->m_type < 0 || clp->m_type >= MCL_MAXTYPES)
 156                 xlog(L_FATAL, "unknown client type in client_add");
 157         cpp = clientlist + clp->m_type;
 158         while (*cpp)
 159                 cpp = &((*cpp)->m_next);
 160         clp->m_next = NULL;
 161         *cpp = clp;
 162 }
 163
 164 void
 165 client_release(nfs_client *clp)
 166 {
 167         if (clp->m_count <= 0)
 168                 xlog(L_FATAL, "client_free: m_count <= 0!");
 169         clp->m_count--;
 170 }
 171
 172 void
 173 client_freeall(void)
 174 {
 175         nfs_client      *clp, **head;
 176         int             i;
 177
 178         for (i = 0; i < MCL_MAXTYPES; i++) {
 179                 head = clientlist + i;
 180                 while (*head) {
 181                         *head = (clp = *head)->m_next;
 182                         xfree(clp);
 183                 }
 184         }
 185 }
 186
 187 nfs_client *
 188 client_find(struct hostent *hp)
 189 {
 190         nfs_client      *clp;
 191         int             i;
 192
 193         for (i = 0; i < MCL_MAXTYPES; i++) {
 194                 for (clp = clientlist[i]; clp; clp = clp->m_next) {
 195                         if (!client_check(clp, hp))
 196                                 continue;
 197 #ifdef notdef
 198                         if (clp->m_type == MCL_FQDN)
 199                                 return clp;
 200                         return client_dup(clp, hp);
 201 #else
 202                         return clp;
 203 #endif
 204                 }
 205         }
 206         return NULL;
 207 }
 208
 209 /*
 210  * Match a host (given its hostent record) to a client record. This
 211  * is usually called from mountd.
 212  */
 213 int
 214 client_check(nfs_client *clp, struct hostent *hp)
 215 {
 216         char    *hname = (char *) hp->h_name;
 217         char    *cname = clp->m_hostname;
 218         char    **ap;
 219
 220         switch (clp->m_type) {
 221         case MCL_FQDN:
 222         case MCL_SUBNETWORK:
 223                 for (ap = hp->h_addr_list; *ap; ap++) {
 224                         if (client_checkaddr(clp, *(struct in_addr *) *ap))
 225                                 return 1;
 226                 }
 227                 return 0;
 228         case MCL_WILDCARD:
 229                 if (wildmat(hname, cname))
 230                         return 1;
 231                 else {
 232                         for (ap = hp->h_aliases; *ap; ap++)
 233                                 if (wildmat(*ap, cname))
 234                                         return 1;
 235                 }
 236                 return 0;
 237         case MCL_NETGROUP:
 238 #ifdef HAVE_INNETGR
 239                 {
 240                         char    *dot;
 241                         int     match;
 242
 243                         /* First, try to match the hostname without
 244                          * splitting off the domain */
 245                         if (innetgr(cname+1, hname, NULL, NULL))
 246                                 return 1;
 247
 248                         /* Okay, strip off the domain (if we have one) */
 249                         if ((dot = strchr(hname, '.')) == NULL)
 250                                 return 0;
 251
 252                         *dot = '\0';
 253                         match = innetgr(cname+1, hname, NULL, NULL);
 254                         *dot = '.';
 255
 256                         return match;
 257                 }
 258 #else
 259                 return 0;
 260 #endif
 261         case MCL_ANONYMOUS:
 262                 return 1;
 263         default:
 264                 xlog(L_FATAL, "internal: bad client type %d", clp->m_type);
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int
 271 client_checkaddr(nfs_client *clp, struct in_addr addr)
 272 {
 273         int     i;
 274
 275         switch (clp->m_type) {
 276         case MCL_FQDN:
 277                 for (i = 0; i < clp->m_naddr; i++) {
 278                         if (clp->m_addrlist[i].s_addr == addr.s_addr)
 279                                 return 1;
 280                 }
 281                 return 0;
 282         case MCL_SUBNETWORK:
 283                 return !((clp->m_addrlist[0].s_addr ^ addr.s_addr)
 284                         & clp->m_addrlist[1].s_addr);
 285         }
 286         return 0;
 287 }
 288
 289 int
 290 client_gettype(char *ident)
 291 {
 292         char    *sp;
 293
 294         if (ident[0] == '\0')
 295                 return MCL_ANONYMOUS;
 296         if (ident[0] == '@') {
 297 #ifndef HAVE_INNETGR
 298                 xlog(L_WARNING, "netgroup support not compiled in");
 299 #endif
 300                 return MCL_NETGROUP;
 301         }
 302         for (sp = ident; *sp; sp++) {
 303                 if (*sp == '*' || *sp == '?' || *sp == '[')
 304                         return MCL_WILDCARD;
 305                 if (*sp == '/')
 306                         return MCL_SUBNETWORK;
 307                 if (*sp == '\\' && sp[1])
 308                         sp++;
 309         }
 310         return MCL_FQDN;
 311 }