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-rw-r--r--support/export/client.c800
1 files changed, 800 insertions, 0 deletions
diff --git a/support/export/client.c b/support/export/client.c
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index 0000000..79164fe
--- /dev/null
+++ b/support/export/client.c
@@ -0,0 +1,800 @@
+/*
+ * support/export/client.c
+ *
+ * Maintain list of nfsd clients.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <netdb.h>
+#include <errno.h>
+
+#include "sockaddr.h"
+#include "misc.h"
+#include "nfslib.h"
+#include "exportfs.h"
+
+/* netgroup stuff never seems to be defined in any header file. Linux is
+ * not alone in this.
+ */
+#if !defined(__GLIBC__) || __GLIBC__ < 2
+extern int innetgr(char *netgr, char *host, char *, char *);
+#endif
+
+static char *add_name(char *old, const char *add);
+
+nfs_client *clientlist[MCL_MAXTYPES] = { NULL, };
+
+
+static void
+init_addrlist(nfs_client *clp, const struct addrinfo *ai)
+{
+ int i;
+
+ if (ai == NULL)
+ return;
+
+ for (i = 0; (ai != NULL) && (i < NFSCLNT_ADDRMAX); i++) {
+ set_addrlist(clp, i, ai->ai_addr);
+ ai = ai->ai_next;
+ }
+
+ clp->m_naddr = i;
+}
+
+static void
+client_free(nfs_client *clp)
+{
+ free(clp->m_hostname);
+ free(clp);
+}
+
+static int
+init_netmask4(nfs_client *clp, const char *slash)
+{
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ };
+ uint32_t shift;
+
+ /*
+ * Decide what kind of netmask was specified. If there's
+ * no '/' present, assume the netmask is all ones. If
+ * there is a '/' and at least one '.', look for a spelled-
+ * out netmask. Otherwise, assume it was a prefixlen.
+ */
+ if (slash == NULL)
+ shift = 0;
+ else {
+ unsigned long prefixlen;
+
+ if (strchr(slash + 1, '.') != NULL) {
+ if (inet_pton(AF_INET, slash + 1,
+ &sin.sin_addr.s_addr) == 0)
+ goto out_badmask;
+ set_addrlist_in(clp, 1, &sin);
+ return 1;
+ } else {
+ char *endptr;
+
+ prefixlen = strtoul(slash + 1, &endptr, 10);
+ if (*endptr != '\0' && prefixlen != ULONG_MAX &&
+ errno != ERANGE)
+ goto out_badprefix;
+ }
+ if (prefixlen > 32)
+ goto out_badprefix;
+ shift = 32 - (uint32_t)prefixlen;
+ }
+
+ /*
+ * Now construct the full netmask bitmask in a sockaddr_in,
+ * and plant it in the nfs_client record.
+ */
+ sin.sin_addr.s_addr = htonl((uint32_t)~0 << shift);
+ set_addrlist_in(clp, 1, &sin);
+
+ return 1;
+
+out_badmask:
+ xlog(L_ERROR, "Invalid netmask `%s' for %s", slash + 1, clp->m_hostname);
+ return 0;
+
+out_badprefix:
+ xlog(L_ERROR, "Invalid prefix `%s' for %s", slash + 1, clp->m_hostname);
+ return 0;
+}
+
+#ifdef IPV6_SUPPORTED
+static int
+init_netmask6(nfs_client *clp, const char *slash)
+{
+ struct sockaddr_in6 sin6 = {
+ .sin6_family = AF_INET6,
+ };
+ unsigned long prefixlen;
+ uint32_t shift;
+ int i;
+
+ /*
+ * Decide what kind of netmask was specified. If there's
+ * no '/' present, assume the netmask is all ones. If
+ * there is a '/' and at least one ':', look for a spelled-
+ * out netmask. Otherwise, assume it was a prefixlen.
+ */
+ if (slash == NULL)
+ prefixlen = 128;
+ else {
+ if (strchr(slash + 1, ':') != NULL) {
+ if (!inet_pton(AF_INET6, slash + 1, &sin6.sin6_addr))
+ goto out_badmask;
+ set_addrlist_in6(clp, 1, &sin6);
+ return 1;
+ } else {
+ char *endptr;
+
+ prefixlen = strtoul(slash + 1, &endptr, 10);
+ if (*endptr != '\0' && prefixlen != ULONG_MAX &&
+ errno != ERANGE)
+ goto out_badprefix;
+ }
+ if (prefixlen > 128)
+ goto out_badprefix;
+ }
+
+ /*
+ * Now construct the full netmask bitmask in a sockaddr_in6,
+ * and plant it in the nfs_client record.
+ */
+ for (i = 0; prefixlen > 32; i++) {
+ sin6.sin6_addr.s6_addr32[i] = 0xffffffff;
+ prefixlen -= 32;
+ }
+ shift = 32 - (uint32_t)prefixlen;
+ sin6.sin6_addr.s6_addr32[i] = htonl((uint32_t)~0 << shift);
+ set_addrlist_in6(clp, 1, &sin6);
+
+ return 1;
+
+out_badmask:
+ xlog(L_ERROR, "Invalid netmask `%s' for %s", slash + 1, clp->m_hostname);
+ return 0;
+
+out_badprefix:
+ xlog(L_ERROR, "Invalid prefix `%s' for %s", slash + 1, clp->m_hostname);
+ return 0;
+}
+#else /* IPV6_SUPPORTED */
+static int
+init_netmask6(nfs_client *UNUSED(clp), const char *UNUSED(slash))
+{
+ return 0;
+}
+#endif /* IPV6_SUPPORTED */
+
+/*
+ * Parse the network mask for M_SUBNETWORK type clients.
+ *
+ * Return TRUE if successful, or FALSE if some error occurred.
+ */
+static int
+init_subnetwork(nfs_client *clp)
+{
+ struct addrinfo *ai;
+ sa_family_t family;
+ int result = 0;
+ char *slash;
+
+ slash = strchr(clp->m_hostname, '/');
+ if (slash != NULL) {
+ *slash = '\0';
+ ai = host_pton(clp->m_hostname);
+ *slash = '/';
+ } else
+ ai = host_pton(clp->m_hostname);
+ if (ai == NULL) {
+ xlog(L_ERROR, "Invalid IP address %s", clp->m_hostname);
+ return result;
+ }
+
+ set_addrlist(clp, 0, ai->ai_addr);
+ family = ai->ai_addr->sa_family;
+
+ nfs_freeaddrinfo(ai);
+
+ switch (family) {
+ case AF_INET:
+ result = init_netmask4(clp, slash);
+ break;
+ case AF_INET6:
+ result = init_netmask6(clp, slash);
+ break;
+ default:
+ xlog(L_ERROR, "Unsupported address family for %s",
+ clp->m_hostname);
+ }
+
+ return result;
+}
+
+static int
+client_init(nfs_client *clp, const char *hname, const struct addrinfo *ai)
+{
+ 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, ai);
+ return 1;
+}
+
+static void
+client_add(nfs_client *clp)
+{
+ nfs_client **cpp;
+
+ cpp = &clientlist[clp->m_type];
+ while (*cpp != NULL)
+ cpp = &((*cpp)->m_next);
+ clp->m_next = NULL;
+ *cpp = clp;
+}
+
+/**
+ * client_lookup - look for @hname in our list of cached nfs_clients
+ * @hname: '\0'-terminated ASCII string containing hostname to look for
+ * @canonical: if set, @hname is known to be canonical DNS name
+ *
+ * Returns pointer to a matching or freshly created nfs_client. NULL
+ * is returned if some problem occurs.
+ */
+nfs_client *
+client_lookup(char *hname, int canonical)
+{
+ nfs_client *clp = NULL;
+ int htype;
+ struct addrinfo *ai = NULL;
+
+ htype = client_gettype(hname);
+
+ if (htype == MCL_FQDN && !canonical) {
+ ai = host_addrinfo(hname);
+ if (!ai) {
+ xlog(L_WARNING, "Failed to resolve %s", hname);
+ goto out;
+ }
+ hname = ai->ai_canonname;
+
+ for (clp = clientlist[htype]; clp; clp = clp->m_next)
+ if (client_check(clp, ai))
+ break;
+ } else {
+ for (clp = clientlist[htype]; clp; clp = clp->m_next) {
+ if (strcasecmp(hname, clp->m_hostname)==0)
+ break;
+ }
+ }
+
+ if (clp == NULL) {
+ clp = calloc(1, sizeof(*clp));
+ if (clp == NULL)
+ goto out;
+ clp->m_type = htype;
+ if (!client_init(clp, hname, NULL)) {
+ client_free(clp);
+ clp = NULL;
+ goto out;
+ }
+ client_add(clp);
+ }
+
+ if (htype == MCL_FQDN && clp->m_naddr == 0)
+ init_addrlist(clp, ai);
+
+out:
+ nfs_freeaddrinfo(ai);
+ return clp;
+}
+
+/**
+ * client_dup - create a copy of an nfs_client
+ * @clp: pointer to nfs_client to copy
+ * @ai: pointer to addrinfo used to initialize the new client's addrlist
+ *
+ * Returns a dynamically allocated nfs_client if successful, or
+ * NULL if some problem occurs. Caller must free the returned
+ * nfs_client with free(3).
+ */
+nfs_client *
+client_dup(const nfs_client *clp, const struct addrinfo *ai)
+{
+ nfs_client *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;
+
+ if (!client_init(new, ai->ai_canonname, ai)) {
+ client_free(new);
+ return NULL;
+ }
+ client_add(new);
+ return new;
+}
+
+/**
+ * client_release - drop a reference to an nfs_client record
+ *
+ */
+void
+client_release(nfs_client *clp)
+{
+ if (clp->m_count <= 0)
+ xlog(L_FATAL, "client_free: m_count <= 0!");
+ clp->m_count--;
+}
+
+/**
+ * client_freeall - deallocate all nfs_client records
+ *
+ */
+void
+client_freeall(void)
+{
+ nfs_client *clp, **head;
+ int i;
+
+ for (i = 0; i < MCL_MAXTYPES; i++) {
+ head = clientlist + i;
+ while (*head) {
+ *head = (clp = *head)->m_next;
+ client_free(clp);
+ }
+ }
+}
+
+/**
+ * client_resolve - look up an IP address
+ * @sap: pointer to socket address to resolve
+ *
+ * Returns an addrinfo structure, or NULL if some problem occurred.
+ * Caller must free the result with freeaddrinfo(3).
+ */
+struct addrinfo *
+client_resolve(const struct sockaddr *sap)
+{
+ struct addrinfo *ai = NULL;
+
+ if (clientlist[MCL_WILDCARD] || clientlist[MCL_NETGROUP])
+ ai = host_reliable_addrinfo(sap);
+ if (ai == NULL)
+ ai = host_numeric_addrinfo(sap);
+
+ return ai;
+}
+
+/**
+ * client_compose - Make a list of cached hostnames that match an IP address
+ * @ai: pointer to addrinfo 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).
+ */
+char *
+client_compose(const struct addrinfo *ai)
+{
+ char *name = NULL;
+ int i;
+
+ for (i = 0 ; i < MCL_MAXTYPES; i++) {
+ nfs_client *clp;
+ for (clp = clientlist[i]; clp ; clp = clp->m_next) {
+ if (!client_check(clp, ai))
+ continue;
+ name = add_name(name, clp->m_hostname);
+ }
+ }
+ 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(const char *client, const char *name)
+{
+ size_t l = strlen(name);
+
+ while (*client) {
+ if (strncmp(client, name, l) == 0 &&
+ (client[l] == ',' || client[l] == '\0'))
+ return 1;
+ client = strchr(client, ',');
+ if (client == NULL)
+ return 0;
+ client++;
+ }
+ return 0;
+}
+
+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)
+ a++, b++;
+ if (!*b && (!*a || *a == ','))
+ return 0;
+ if (!*b) return 1;
+ if (!*a || *a == ',') return -1;
+ return *a - *b;
+}
+
+static char *
+add_name(char *old, const char *add)
+{
+ size_t len = strlen(add) + 2;
+ char *new;
+ char *cp;
+ if (old) len += strlen(old);
+
+ new = malloc(len);
+ if (!new) {
+ free(old);
+ return NULL;
+ }
+ cp = old;
+ while (cp && *cp && name_cmp(cp, add) < 0) {
+ /* step cp forward over a name */
+ char *e = strchr(cp, ',');
+ if (e)
+ cp = e+1;
+ else
+ cp = cp + strlen(cp);
+ }
+ len = cp-old;
+ if (old && len > 0) {
+ strncpy(new, old, len);
+ new[cp-old] = 0;
+ } else {
+ new[0] = 0;
+ }
+ if (cp != old && !*cp)
+ strcat(new, ",");
+ strcat(new, add);
+ if (cp && *cp) {
+ strcat(new, ",");
+ strcat(new, cp);
+ }
+ free(old);
+ return new;
+}
+
+/*
+ * Check each address listed in @ai against each address
+ * stored in @clp. Return 1 if a match is found, otherwise
+ * zero.
+ */
+static int
+check_fqdn(const nfs_client *clp, const struct addrinfo *ai)
+{
+ int i;
+
+ for (; ai; ai = ai->ai_next)
+ for (i = 0; i < clp->m_naddr; i++)
+ if (nfs_compare_sockaddr(ai->ai_addr,
+ get_addrlist(clp, i)))
+ return 1;
+
+ return 0;
+}
+
+static _Bool
+mask_match(const uint32_t a, const uint32_t b, const uint32_t m)
+{
+ return ((a ^ b) & m) == 0;
+}
+
+static int
+check_subnet_v4(const struct sockaddr_in *address,
+ const struct sockaddr_in *mask, const struct addrinfo *ai)
+{
+ for (; ai; ai = ai->ai_next) {
+ struct sockaddr_in *sin = (struct sockaddr_in *)ai->ai_addr;
+
+ if (sin->sin_family != AF_INET)
+ continue;
+
+ if (mask_match(address->sin_addr.s_addr,
+ sin->sin_addr.s_addr,
+ mask->sin_addr.s_addr))
+ return 1;
+ }
+ return 0;
+}
+
+#ifdef IPV6_SUPPORTED
+static int
+check_subnet_v6(const struct sockaddr_in6 *address,
+ const struct sockaddr_in6 *mask, const struct addrinfo *ai)
+{
+ for (; ai; ai = ai->ai_next) {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai->ai_addr;
+
+ if (sin6->sin6_family != AF_INET6)
+ continue;
+
+ if (mask_match(address->sin6_addr.s6_addr32[0],
+ sin6->sin6_addr.s6_addr32[0],
+ mask->sin6_addr.s6_addr32[0]) &&
+ mask_match(address->sin6_addr.s6_addr32[1],
+ sin6->sin6_addr.s6_addr32[1],
+ mask->sin6_addr.s6_addr32[1]) &&
+ mask_match(address->sin6_addr.s6_addr32[2],
+ sin6->sin6_addr.s6_addr32[2],
+ mask->sin6_addr.s6_addr32[2]) &&
+ mask_match(address->sin6_addr.s6_addr32[3],
+ sin6->sin6_addr.s6_addr32[3],
+ mask->sin6_addr.s6_addr32[3]))
+ return 1;
+ }
+ return 0;
+}
+#else /* !IPV6_SUPPORTED */
+static int
+check_subnet_v6(const struct sockaddr_in6 *UNUSED(address),
+ const struct sockaddr_in6 *UNUSED(mask),
+ const struct addrinfo *UNUSED(ai))
+{
+ return 0;
+}
+#endif /* !IPV6_SUPPORTED */
+
+/*
+ * Check each address listed in @ai 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 addrinfo *ai)
+{
+ switch (get_addrlist(clp, 0)->sa_family) {
+ case AF_INET:
+ return check_subnet_v4(get_addrlist_in(clp, 0),
+ get_addrlist_in(clp, 1), ai);
+ case AF_INET6:
+ return check_subnet_v6(get_addrlist_in6(clp, 0),
+ get_addrlist_in6(clp, 1), ai);
+ }
+
+ return 0;
+}
+
+/*
+ * 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 addrinfo *ai)
+{
+ char *hname, *cname = clp->m_hostname;
+ struct hostent *hp;
+ char **ap;
+ int match;
+
+ match = 0;
+
+ hname = host_canonname(ai->ai_addr);
+ if (hname == NULL)
+ goto out;
+
+ if (wildmat(hname, cname)) {
+ match = 1;
+ goto out;
+ }
+
+ /* See if hname aliases listed in /etc/hosts or nis[+]
+ * match the requested wildcard */
+ hp = gethostbyname(hname);
+ if (hp != NULL) {
+ for (ap = hp->h_aliases; *ap; ap++)
+ if (wildmat(*ap, cname)) {
+ match = 1;
+ goto out;
+ }
+ }
+
+out:
+ free(hname);
+ return match;
+}
+
+/*
+ * Check if @ai's hostname or aliases fall in a given netgroup.
+ * Return 1 if @ai represents a host in the netgroup, otherwise
+ * zero.
+ */
+#ifdef HAVE_INNETGR
+static int
+check_netgroup(const nfs_client *clp, const struct addrinfo *ai)
+{
+ const char *netgroup = clp->m_hostname + 1;
+ struct addrinfo *tmp = NULL;
+ struct hostent *hp;
+ char *dot, *hname, *ip;
+ int i, match;
+
+ match = 0;
+
+ hname = host_canonname(ai->ai_addr);
+ if (hname == NULL)
+ goto out;
+
+ /* First, try to match the hostname without
+ * splitting off the domain */
+ if (innetgr(netgroup, hname, NULL, NULL)) {
+ match = 1;
+ goto out;
+ }
+
+ /* See if hname aliases listed in /etc/hosts or nis[+]
+ * match the requested netgroup */
+ hp = gethostbyname(hname);
+ if (hp != NULL) {
+ for (i = 0; hp->h_aliases[i]; i++)
+ if (innetgr(netgroup, hp->h_aliases[i], NULL, NULL)) {
+ match = 1;
+ goto out;
+ }
+ }
+
+ /* If hname happens to be an IP address, convert it
+ * to a the canonical DNS name bound to this address. */
+ tmp = host_pton(hname);
+ if (tmp != NULL) {
+ char *cname = host_canonname(tmp->ai_addr);
+ nfs_freeaddrinfo(tmp);
+
+ /* The resulting FQDN may be in our netgroup. */
+ if (cname != NULL) {
+ free(hname);
+ hname = cname;
+ if (innetgr(netgroup, hname, NULL, NULL)) {
+ match = 1;
+ goto out;
+ }
+ }
+ }
+
+ /* check whether the IP itself is in the netgroup */
+ ip = calloc(INET6_ADDRSTRLEN, 1);
+ if (ip == NULL)
+ goto out;
+
+ if (inet_ntop(ai->ai_family, &(((struct sockaddr_in *)ai->ai_addr)->sin_addr), ip, INET6_ADDRSTRLEN) == ip) {
+ if (innetgr(netgroup, ip, NULL, NULL)) {
+ free(hname);
+ hname = ip;
+ match = 1;
+ goto out;
+ }
+ }
+ free(ip);
+
+ /* Okay, strip off the domain (if we have one) */
+ dot = strchr(hname, '.');
+ if (dot == NULL)
+ goto out;
+
+ *dot = '\0';
+ match = innetgr(netgroup, hname, NULL, NULL);
+
+out:
+ free(hname);
+ return match;
+}
+#else /* !HAVE_INNETGR */
+static int
+check_netgroup(__attribute__((unused)) const nfs_client *clp,
+ __attribute__((unused)) const struct addrinfo *ai)
+{
+ 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
+ * @ai: pointer to addrinfo to compare it with
+ *
+ * Returns 1 if the address information matches the cached nfs_client,
+ * otherwise zero.
+ */
+int
+client_check(const nfs_client *clp, const struct addrinfo *ai)
+{
+ switch (clp->m_type) {
+ case MCL_FQDN:
+ return check_fqdn(clp, ai);
+ case MCL_SUBNETWORK:
+ return check_subnetwork(clp, ai);
+ case MCL_WILDCARD:
+ return check_wildcard(clp, ai);
+ case MCL_NETGROUP:
+ return check_netgroup(clp, ai);
+ 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;
+}
+
+/**
+ * client_gettype - determine type of nfs_client given an identifier
+ * @ident: '\0'-terminated ASCII string containing a client identifier
+ *
+ * Returns the type of nfs_client record that would be used for
+ * this client.
+ */
+int
+client_gettype(char *ident)
+{
+ char *sp;
+
+ if (ident[0] == '\0' || strcmp(ident, "*")==0)
+ return MCL_ANONYMOUS;
+ if (strncmp(ident, "gss/", 4) == 0)
+ return MCL_GSS;
+ if (ident[0] == '@') {
+#ifndef HAVE_INNETGR
+ xlog(L_WARNING, "netgroup support not compiled in");
+#endif
+ return MCL_NETGROUP;
+ }
+ for (sp = ident; *sp; sp++) {
+ if (*sp == '*' || *sp == '?' || *sp == '[')
+ return MCL_WILDCARD;
+ if (*sp == '/')
+ return MCL_SUBNETWORK;
+ if (*sp == '\\' && sp[1])
+ sp++;
+ }
+
+ return MCL_FQDN;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-04 02:39:52 +0000