diff options
Diffstat (limited to 'support/export/client.c')
| -rw-r--r-- | support/export/client.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/support/export/client.c b/support/export/client.c new file mode 100644 index 0000000..8c5200a --- /dev/null +++ b/support/export/client.c @@ -0,0 +1,298 @@ +/* + * support/export/client.c + * + * Maintain list of nfsd clients. + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + */ + +#include "config.h" + +#include <sys/types.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <stdlib.h> +#include <string.h> +#include <netdb.h> +#include "xmalloc.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 void client_init(nfs_client *clp, const char *hname, + struct hostent *hp); +static int client_checkaddr(nfs_client *clp, struct in_addr addr); + +nfs_client *clientlist[MCL_MAXTYPES] = { NULL, }; + + +nfs_client * +client_lookup(char *hname) +{ + nfs_client *clp = NULL; + int htype; + struct hostent *hp = NULL; + + htype = client_gettype(hname); + + if (htype == MCL_FQDN) { + hp = gethostbyname(hname); + if (hp == NULL || hp->h_addrtype != AF_INET) { + xlog(L_ERROR, "%s has non-inet addr", hname); + return NULL; + } + hp = hostent_dup (hp); + hname = (char *) hp->h_name; + + for (clp = clientlist[htype]; clp; clp = clp->m_next) { + if (client_check(clp, hp)) + break; + } + } else { + for (clp = clientlist[htype]; clp; clp = clp->m_next) { + if (strcmp(hname, clp->m_hostname)==0) + break; + } + } + + if (!clp) { + clp = (nfs_client *) xmalloc(sizeof(*clp)); + memset(clp, 0, sizeof(*clp)); + clp->m_type = htype; + client_init(clp, hname, NULL); + 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 (hp) + free (hp); + + return clp; +} + +nfs_client * +client_dup(nfs_client *clp, struct hostent *hp) +{ + nfs_client *new; + + new = (nfs_client *) xmalloc(sizeof(*new)); + memcpy(new, clp, sizeof(*new)); + new->m_type = MCL_FQDN; + + client_init(new, (char *) hp->h_name, hp); + client_add(new); + return new; +} + +static void +client_init(nfs_client *clp, const char *hname, struct hostent *hp) +{ + if (hp) { + strncpy(clp->m_hostname, hp->h_name, + sizeof (clp->m_hostname) - 1); + } else { + strncpy(clp->m_hostname, hname, + sizeof (clp->m_hostname) - 1); + } + clp->m_hostname[sizeof (clp->m_hostname) - 1] = '\0'; + + clp->m_exported = 0; + clp->m_count = 0; + + if (clp->m_type == MCL_SUBNETWORK) { + char *cp = strchr(clp->m_hostname, '/'); + + *cp = '\0'; + clp->m_addrlist[0].s_addr = inet_addr(clp->m_hostname); + clp->m_addrlist[1].s_addr = inet_addr(cp+1); + *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) +{ + nfs_client **cpp; + + if (clp->m_type < 0 || clp->m_type >= MCL_MAXTYPES) + xlog(L_FATAL, "unknown client type in client_add"); + cpp = clientlist + clp->m_type; + while (*cpp) + cpp = &((*cpp)->m_next); + clp->m_next = NULL; + *cpp = clp; +} + +void +client_release(nfs_client *clp) +{ + if (clp->m_count <= 0) + xlog(L_FATAL, "client_free: m_count <= 0!"); + clp->m_count--; +} + +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; + xfree(clp); + } + } +} + +nfs_client * +client_find(struct hostent *hp) +{ + nfs_client *clp; + int i; + + for (i = 0; i < MCL_MAXTYPES; i++) { + for (clp = clientlist[i]; clp; clp = clp->m_next) { + if (!client_check(clp, hp)) + continue; +#ifdef notdef + if (clp->m_type == MCL_FQDN) + return clp; + return client_dup(clp, hp); +#else + return clp; +#endif + } + } + return NULL; +} + +/* + * Match a host (given its hostent record) to a client record. This + * is usually called from mountd. + */ +int +client_check(nfs_client *clp, struct hostent *hp) +{ + char *hname = (char *) hp->h_name; + char *cname = clp->m_hostname; + char **ap; + + 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; + + /* First, try to match the hostname without + * splitting off the domain */ + if (innetgr(cname+1, hname, NULL, NULL)) + return 1; + + /* Okay, strip off the domain (if we have one) */ + if ((dot = strchr(hname, '.')) == NULL) + return 0; + + *dot = '\0'; + match = innetgr(cname+1, hname, NULL, dot + 1); + *dot = '.'; + + return match; + } +#else + return 0; +#endif + case MCL_ANONYMOUS: + return 1; + default: + xlog(L_FATAL, "internal: bad client type %d", clp->m_type); + } + + return 0; +} + +static int +client_checkaddr(nfs_client *clp, struct in_addr addr) +{ + int i; + + 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; + case MCL_SUBNETWORK: + return !((clp->m_addrlist[0].s_addr ^ addr.s_addr) + & clp->m_addrlist[1].s_addr); + } + return 0; +} + +int +client_gettype(char *ident) +{ + char *sp; + + if (ident[0] == '\0') + return MCL_ANONYMOUS; + 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; +} |