#include <string.h>
#include <ctype.h>
#include <netdb.h>
-#include "xmalloc.h"
+
#include "misc.h"
#include "nfslib.h"
#include "exportfs.h"
#if !defined(__GLIBC__) || __GLIBC__ < 2
extern int innetgr(char *netgr, char *host, char *, char *);
#endif
-static void client_init(nfs_client *clp, const char *hname,
- struct hostent *hp);
-static int client_checkaddr(nfs_client *clp, struct in_addr addr);
+
+static char *add_name(char *old, const char *add);
nfs_client *clientlist[MCL_MAXTYPES] = { NULL, };
+static void
+init_addrlist(nfs_client *clp, const struct hostent *hp)
+{
+ char **ap;
+ int i;
+
+ if (hp == NULL)
+ return;
+
+ ap = hp->h_addr_list;
+ for (i = 0; *ap != NULL && i < NFSCLNT_ADDRMAX; i++, ap++)
+ clp->m_addrlist[i] = *(struct in_addr *)*ap;
+
+ clp->m_naddr = i;
+}
+
+static void
+client_free(nfs_client *clp)
+{
+ free(clp->m_hostname);
+ free(clp);
+}
+
+static int
+init_netmask(nfs_client *clp, const char *slash)
+{
+ if (strchr(slash + 1, '.') != NULL)
+ clp->m_addrlist[1].s_addr = inet_addr(slash + 1);
+ else {
+ int prefixlen = atoi(slash + 1);
+ if (0 < prefixlen && prefixlen <= 32)
+ clp->m_addrlist[1].s_addr =
+ htonl((uint32_t)~0 << (32 - prefixlen));
+ else
+ goto out_badprefix;
+ }
+
+ return 1;
+
+out_badprefix:
+ xlog(L_ERROR, "Invalid prefix `%s' for %s", slash + 1, clp->m_hostname);
+ return 0;
+}
+
+static int
+init_subnetwork(nfs_client *clp)
+{
+ static char slash32[] = "/32";
+ char *cp;
+
+ cp = strchr(clp->m_hostname, '/');
+ if (cp == NULL)
+ cp = slash32;
+
+ *cp = '\0';
+ clp->m_addrlist[0].s_addr = inet_addr(clp->m_hostname);
+ *cp = '/';
+
+ return init_netmask(clp, cp);
+}
+
+static int
+client_init(nfs_client *clp, const char *hname, const struct hostent *hp)
+{
+ clp->m_hostname = strdup(hname);
+ if (clp->m_hostname == NULL)
+ return 0;
+
+ clp->m_exported = 0;
+ clp->m_count = 0;
+ clp->m_naddr = 0;
+
+ if (clp->m_type == MCL_SUBNETWORK)
+ return init_subnetwork(clp);
+
+ init_addrlist(clp, hp);
+ return 1;
+}
+
/* if canonical is set, then we *know* this is already a canonical name
* so hostname lookup is avoided.
* This is used when reading /proc/fs/nfs/exports
}
}
- if (!clp) {
- clp = (nfs_client *) xmalloc(sizeof(*clp));
- memset(clp, 0, sizeof(*clp));
+ if (clp == NULL) {
+ clp = calloc(1, sizeof(*clp));
+ if (clp == NULL)
+ goto out;
clp->m_type = htype;
- client_init(clp, hname, NULL);
+ if (!client_init(clp, hname, NULL)) {
+ client_free(clp);
+ clp = NULL;
+ goto out;
+ }
client_add(clp);
}
- if (htype == MCL_FQDN && clp->m_naddr == 0 && hp != NULL) {
- char **ap = hp->h_addr_list;
- int i;
-
- for (i = 0; *ap && i < NFSCLNT_ADDRMAX; i++, ap++)
- clp->m_addrlist[i] = *(struct in_addr *)*ap;
- clp->m_naddr = i;
- }
+ if (htype == MCL_FQDN && clp->m_naddr == 0)
+ init_addrlist(clp, hp);
+out:
if (hp)
free (hp);
{
nfs_client *new;
- new = (nfs_client *) xmalloc(sizeof(*new));
+ new = (nfs_client *)malloc(sizeof(*new));
+ if (new == NULL)
+ return NULL;
memcpy(new, clp, sizeof(*new));
new->m_type = MCL_FQDN;
new->m_hostname = NULL;
- client_init(new, (char *) hp->h_name, hp);
+ if (!client_init(new, hp->h_name, hp)) {
+ client_free(new);
+ return NULL;
+ }
client_add(new);
return new;
}
-static void
-client_init(nfs_client *clp, const char *hname, struct hostent *hp)
-{
- xfree(clp->m_hostname);
- if (hp)
- clp->m_hostname = xstrdup(hp->h_name);
- else
- clp->m_hostname = xstrdup(hname);
-
- clp->m_exported = 0;
- clp->m_count = 0;
-
- if (clp->m_type == MCL_SUBNETWORK) {
- char *cp = strchr(clp->m_hostname, '/');
- static char slash32[] = "/32";
-
- if(!cp) cp = slash32;
- *cp = '\0';
- clp->m_addrlist[0].s_addr = inet_addr(clp->m_hostname);
- if (strchr(cp + 1, '.')) {
- clp->m_addrlist[1].s_addr = inet_addr(cp+1);
- }
- else {
- int netmask = atoi(cp + 1);
- if (0 < netmask && netmask <= 32) {
- clp->m_addrlist[1].s_addr =
- htonl ((uint32_t) ~0 << (32 - netmask));
- }
- else {
- xlog(L_FATAL, "invalid netmask `%s' for %s",
- cp + 1, clp->m_hostname);
- }
- }
- *cp = '/';
- clp->m_naddr = 0;
- } else if (!hp) {
- clp->m_naddr = 0;
- } else {
- char **ap = hp->h_addr_list;
- int i;
-
- for (i = 0; *ap && i < NFSCLNT_ADDRMAX; i++, ap++) {
- clp->m_addrlist[i] = *(struct in_addr *)*ap;
- }
- clp->m_naddr = i;
- }
-}
-
void
client_add(nfs_client *clp)
{
head = clientlist + i;
while (*head) {
*head = (clp = *head)->m_next;
- xfree(clp->m_hostname);
- xfree(clp);
+ client_free(clp);
}
}
}
return he;
}
-/*
- * Find client name given an IP address
- * This is found by gathering all known names that match that IP address,
- * sorting them and joining them with '+'
+/**
+ * client_compose - Make a list of cached hostnames that match an IP address
+ * @he: pointer to hostent containing IP address information to match
*
+ * Gather all known client hostnames that match the IP address, and sort
+ * the result into a comma-separated list.
+ *
+ * Returns a '\0'-terminated ASCII string containing a comma-separated
+ * sorted list of client hostnames, or NULL if no client records matched
+ * the IP address or memory could not be allocated. Caller must free the
+ * returned string with free(3).
*/
-static char *add_name(char *old, char *add);
-
char *
client_compose(struct hostent *he)
{
return name;
}
+/**
+ * client_member - check if @name is contained in the list @client
+ * @client: '\0'-terminated ASCII string containing
+ * comma-separated list of hostnames
+ * @name: '\0'-terminated ASCII string containing hostname to look for
+ *
+ * Returns 1 if @name was found in @client, otherwise zero is returned.
+ */
int
-client_member(char *client, char *name)
+client_member(const char *client, const char *name)
{
- /* check if "client" (a ',' separated list of names)
- * contains 'name' as a member
- */
- int l = strlen(name);
+ size_t l = strlen(name);
+
while (*client) {
if (strncmp(client, name, l) == 0 &&
(client[l] == ',' || client[l] == '\0'))
return 0;
}
-
-int
-name_cmp(char *a, char *b)
+static int
+name_cmp(const char *a, const char *b)
{
/* compare strings a and b, but only upto ',' in a */
while (*a && *b && *a != ',' && *a == *b)
}
static char *
-add_name(char *old, char *add)
+add_name(char *old, const char *add)
{
- int len = strlen(add)+2;
+ size_t len = strlen(add) + 2;
char *new;
char *cp;
if (old) len += strlen(old);
}
/*
- * Match a host (given its hostent record) to a client record. This
- * is usually called from mountd.
+ * Check each address listed in @hp against each address
+ * stored in @clp. Return 1 if a match is found, otherwise
+ * zero.
*/
-int
-client_check(nfs_client *clp, struct hostent *hp)
+static int
+check_fqdn(const nfs_client *clp, const struct hostent *hp)
{
- char *hname = (char *) hp->h_name;
- char *cname = clp->m_hostname;
- char **ap;
+ struct in_addr addr;
+ char **ap;
+ int i;
- switch (clp->m_type) {
- case MCL_FQDN:
- case MCL_SUBNETWORK:
- for (ap = hp->h_addr_list; *ap; ap++) {
- if (client_checkaddr(clp, *(struct in_addr *) *ap))
- return 1;
- }
- return 0;
- case MCL_WILDCARD:
- if (wildmat(hname, cname))
- return 1;
- else {
- for (ap = hp->h_aliases; *ap; ap++)
- if (wildmat(*ap, cname))
- return 1;
- }
- return 0;
- case MCL_NETGROUP:
-#ifdef HAVE_INNETGR
- {
- char *dot;
- int match, i;
- struct hostent *nhp = NULL;
- struct sockaddr_in addr;
-
- /* First, try to match the hostname without
- * splitting off the domain */
- if (innetgr(cname+1, hname, NULL, NULL))
+ for (ap = hp->h_addr_list; *ap; ap++) {
+ addr = *(struct in_addr *)*ap;
+
+ for (i = 0; i < clp->m_naddr; i++)
+ if (clp->m_addrlist[i].s_addr == addr.s_addr)
return 1;
+ }
+ return 0;
+}
- /* try the aliases as well */
- for (i = 0; hp->h_aliases[i]; i++) {
- if (innetgr(cname+1, hp->h_aliases[i], NULL, NULL))
- return 1;
- }
+/*
+ * Check each address listed in @hp against the subnetwork or
+ * host address stored in @clp. Return 1 if an address in @hp
+ * matches the host address stored in @clp, otherwise zero.
+ */
+static int
+check_subnetwork(const nfs_client *clp, const struct hostent *hp)
+{
+ struct in_addr addr;
+ char **ap;
- /* If hname is ip address convert to FQDN */
- if (inet_aton(hname, &addr.sin_addr) &&
- (nhp = gethostbyaddr((const char *)&(addr.sin_addr),
- sizeof(addr.sin_addr), AF_INET))) {
- hname = (char *)nhp->h_name;
- if (innetgr(cname+1, hname, NULL, NULL))
- return 1;
- }
+ for (ap = hp->h_addr_list; *ap; ap++) {
+ addr = *(struct in_addr *)*ap;
- /* Okay, strip off the domain (if we have one) */
- if ((dot = strchr(hname, '.')) == NULL)
- return 0;
+ if (!((clp->m_addrlist[0].s_addr ^ addr.s_addr) &
+ clp->m_addrlist[1].s_addr))
+ return 1;
+ }
+ return 0;
+}
- *dot = '\0';
- match = innetgr(cname+1, hname, NULL, NULL);
- *dot = '.';
+/*
+ * Check if a wildcard nfs_client record matches the canonical name
+ * or the aliases of a host. Return 1 if a match is found, otherwise
+ * zero.
+ */
+static int
+check_wildcard(const nfs_client *clp, const struct hostent *hp)
+{
+ char *cname = clp->m_hostname;
+ char *hname = hp->h_name;
+ char **ap;
- return match;
- }
-#else
- return 0;
-#endif
- case MCL_ANONYMOUS:
+ if (wildmat(hname, cname))
return 1;
- case MCL_GSS:
- return 0;
- default:
- xlog(L_FATAL, "internal: bad client type %d", clp->m_type);
+
+ /* See if hname aliases listed in /etc/hosts or nis[+]
+ * match the requested wildcard */
+ for (ap = hp->h_aliases; *ap; ap++) {
+ if (wildmat(*ap, cname))
+ return 1;
}
return 0;
}
+/*
+ * Check if @hp's hostname or aliases fall in a given netgroup.
+ * Return 1 if @hp represents a host in the netgroup, otherwise zero.
+ */
+#ifdef HAVE_INNETGR
+static int
+check_netgroup(const nfs_client *clp, const struct hostent *hp)
+{
+ const char *netgroup = clp->m_hostname + 1;
+ const char *hname = hp->h_name;
+ struct hostent *nhp = NULL;
+ struct sockaddr_in addr;
+ int match, i;
+ char *dot;
+
+ /* First, try to match the hostname without
+ * splitting off the domain */
+ if (innetgr(netgroup, hname, NULL, NULL))
+ return 1;
+
+ /* See if hname aliases listed in /etc/hosts or nis[+]
+ * match the requested netgroup */
+ for (i = 0; hp->h_aliases[i]; i++) {
+ if (innetgr(netgroup, hp->h_aliases[i], NULL, NULL))
+ return 1;
+ }
+
+ /* If hname is ip address convert to FQDN */
+ if (inet_aton(hname, &addr.sin_addr) &&
+ (nhp = gethostbyaddr((const char *)&(addr.sin_addr),
+ sizeof(addr.sin_addr), AF_INET))) {
+ hname = nhp->h_name;
+ if (innetgr(netgroup, hname, NULL, NULL))
+ return 1;
+ }
+
+ /* Okay, strip off the domain (if we have one) */
+ dot = strchr(hname, '.');
+ if (dot == NULL)
+ return 0;
+
+ *dot = '\0';
+ match = innetgr(netgroup, hname, NULL, NULL);
+ *dot = '.';
+
+ return match;
+}
+#else /* !HAVE_INNETGR */
static int
-client_checkaddr(nfs_client *clp, struct in_addr addr)
+check_netgroup(__attribute__((unused)) const nfs_client *clp,
+ __attribute__((unused)) const struct hostent *hp)
{
- int i;
+ return 0;
+}
+#endif /* !HAVE_INNETGR */
+/**
+ * client_check - check if IP address information matches a cached nfs_client
+ * @clp: pointer to a cached nfs_client record
+ * @hp: pointer to hostent containing host IP information
+ *
+ * Returns 1 if the address information matches the cached nfs_client,
+ * otherwise zero.
+ */
+int
+client_check(nfs_client *clp, struct hostent *hp)
+{
switch (clp->m_type) {
case MCL_FQDN:
- for (i = 0; i < clp->m_naddr; i++) {
- if (clp->m_addrlist[i].s_addr == addr.s_addr)
- return 1;
- }
- return 0;
+ return check_fqdn(clp, hp);
case MCL_SUBNETWORK:
- return !((clp->m_addrlist[0].s_addr ^ addr.s_addr)
- & clp->m_addrlist[1].s_addr);
+ return check_subnetwork(clp, hp);
+ case MCL_WILDCARD:
+ return check_wildcard(clp, hp);
+ case MCL_NETGROUP:
+ return check_netgroup(clp, hp);
+ case MCL_ANONYMOUS:
+ return 1;
+ case MCL_GSS:
+ return 0;
+ default:
+ xlog(D_GENERAL, "%s: unrecognized client type: %d",
+ __func__, clp->m_type);
}
+
return 0;
}
projects / nfs-utils.git / blobdiff