Attachment 891276 Details for Bug 1093162 – add_name function

add_name function

client.c (text/plain), 16.47 KB, created by Jeff Layton on 2014-04-30 19:03:31 UTC

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Creator: Jeff Layton

Created: 2014-04-30 19:03:31 UTC

Size: 16.47 KB

patch

obsolete

>/*
> * 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;
>
>	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_ERROR, "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:
>	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);
>	}
>	strncpy(new, old, cp-old);
>	new[cp-old] = 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 *cname = clp->m_hostname;
>	char *hname = ai->ai_canonname;
>	struct hostent *hp;
>	char **ap;
>
>	if (wildmat(hname, cname))
>		return 1;
>
>	/* 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))
>				return 1;
>	}
>
>	return 0;
>}
>
>/*
> * 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;
>	int i, match;
>
>	match = 0;
>
>	hname = strdup(ai->ai_canonname);
>	if (hname == NULL) {
>		xlog(D_GENERAL, "%s: no memory for strdup", __func__);
>		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);
>		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;
>			}
>		}
>	}
>
>	/* 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;
>}

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Attachments on bug 1093162: 891276