/* Unix SMB/CIFS implementation. a WINS nsswitch module Copyright (C) Andrew Tridgell 1999 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #ifdef HAVE_NS_API_H #include <ns_daemon.h> #endif #if HAVE_PTHREAD_H #include <pthread.h> #endif #if HAVE_PTHREAD static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER; #endif #ifndef INADDRSZ #define INADDRSZ 4 #endif static int initialised; extern bool AllowDebugChange; NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he, char *buffer, size_t buflen, int *h_errnop); NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he, char *buffer, size_t buflen, int *h_errnop); /* Use our own create socket code so we don't recurse.... */ static int wins_lookup_open_socket_in(void) { struct sockaddr_in sock; int val=1; int res; memset((char *)&sock,'\0',sizeof(sock)); #ifdef HAVE_SOCK_SIN_LEN sock.sin_len = sizeof(sock); #endif sock.sin_port = 0; sock.sin_family = AF_INET; sock.sin_addr.s_addr = interpret_addr("0.0.0.0"); res = socket(AF_INET, SOCK_DGRAM, 0); if (res == -1) return -1; if (setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) != 0) { close(res); return -1; } #ifdef SO_REUSEPORT if (setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) != 0) { close(res); return -1; } #endif /* SO_REUSEPORT */ /* now we've got a socket - we need to bind it */ if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) { close(res); return(-1); } set_socket_options(res,"SO_BROADCAST"); return res; } static void nss_wins_init(void) { initialised = 1; DEBUGLEVEL = 0; AllowDebugChange = False; TimeInit(); setup_logging("nss_wins",False); load_case_tables(); lp_load(get_dyn_CONFIGFILE(),True,False,False,True); load_interfaces(); } static struct in_addr *lookup_byname_backend(const char *name, int *count) { int fd = -1; struct ip_service *address = NULL; struct in_addr *ret = NULL; int j, flags = 0; if (!initialised) { nss_wins_init(); } *count = 0; /* always try with wins first */ if (NT_STATUS_IS_OK(resolve_wins(name,0x00,&address,count))) { if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) { free( address ); return NULL; } if (address[0].ss.ss_family != AF_INET) { free(address); free(ret); return NULL; } *ret = ((struct sockaddr_in *)&address[0].ss)->sin_addr; free( address ); return ret; } fd = wins_lookup_open_socket_in(); if (fd == -1) { return NULL; } /* uggh, we have to broadcast to each interface in turn */ for (j=iface_count() - 1;j >= 0;j--) { const struct in_addr *bcast = iface_n_bcast_v4(j); struct sockaddr_storage ss; struct sockaddr_storage *pss; if (!bcast) { continue; } in_addr_to_sockaddr_storage(&ss, *bcast); pss = name_query(fd,name,0x00,True,True,&ss,count, &flags, NULL); if (pss) { if ((ret = SMB_MALLOC_P(struct in_addr)) == NULL) { return NULL; } *ret = ((struct sockaddr_in *)pss)->sin_addr; break; } } close(fd); return ret; } #ifdef HAVE_NS_API_H static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count) { int fd; struct sockaddr_storage ss; struct nmb_name nname; NODE_STATUS_STRUCT *status; if (!initialised) { nss_wins_init(); } fd = wins_lookup_open_socket_in(); if (fd == -1) return NULL; make_nmb_name(&nname, "*", 0); if (!interpret_string_addr(&ss, addr, AI_NUMERICHOST)) { return NULL; } status = node_status_query(fd, &nname, &ss, count, NULL); close(fd); return status; } /* IRIX version */ int init(void) { nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n"); nss_wins_init(); return NSD_OK; } int lookup(nsd_file_t *rq) { char *map; char *key; char *addr; struct in_addr *ip_list; NODE_STATUS_STRUCT *status; int i, count, len, size; char response[1024]; bool found = False; nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n"); if (! rq) return NSD_ERROR; map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0); if (! map) { rq->f_status = NS_FATAL; return NSD_ERROR; } key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0); if (! key || ! *key) { rq->f_status = NS_FATAL; return NSD_ERROR; } response[0] = '\0'; len = sizeof(response) - 2; /* * response needs to be a string of the following format * ip_address[ ip_address]*\tname[ alias]* */ if (StrCaseCmp(map,"hosts.byaddr") == 0) { if ( status = lookup_byaddr_backend(key, &count)) { size = strlen(key) + 1; if (size > len) { free(status); return NSD_ERROR; } len -= size; strncat(response,key,size); strncat(response,"\t",1); for (i = 0; i < count; i++) { /* ignore group names */ if (status[i].flags & 0x80) continue; if (status[i].type == 0x20) { size = sizeof(status[i].name) + 1; if (size > len) { free(status); return NSD_ERROR; } len -= size; strncat(response, status[i].name, size); strncat(response, " ", 1); found = True; } } response[strlen(response)-1] = '\n'; free(status); } } else if (StrCaseCmp(map,"hosts.byname") == 0) { if (ip_list = lookup_byname_backend(key, &count)) { for (i = count; i ; i--) { addr = inet_ntoa(ip_list[i-1]); size = strlen(addr) + 1; if (size > len) { free(ip_list); return NSD_ERROR; } len -= size; if (i != 0) response[strlen(response)-1] = ' '; strncat(response,addr,size); strncat(response,"\t",1); } size = strlen(key) + 1; if (size > len) { free(ip_list); return NSD_ERROR; } strncat(response,key,size); strncat(response,"\n",1); found = True; free(ip_list); } } if (found) { nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response); nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE); return NSD_OK; } nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n"); rq->f_status = NS_NOTFOUND; return NSD_NEXT; } #else /* Allocate some space from the nss static buffer. The buffer and buflen are the pointers passed in by the C library to the _nss_*_* functions. */ static char *get_static(char **buffer, size_t *buflen, int len) { char *result; /* Error check. We return false if things aren't set up right, or there isn't enough buffer space left. */ if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) { return NULL; } /* Return an index into the static buffer */ result = *buffer; *buffer += len; *buflen -= len; return result; } /**************************************************************************** gethostbyname() - we ignore any domain portion of the name and only handle names that are at most 15 characters long **************************************************************************/ NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he, char *buffer, size_t buflen, int *h_errnop) { NSS_STATUS nss_status = NSS_STATUS_SUCCESS; struct in_addr *ip_list; int i, count; fstring name; size_t namelen; #if HAVE_PTHREAD pthread_mutex_lock(&wins_nss_mutex); #endif memset(he, '\0', sizeof(*he)); fstrcpy(name, hostname); /* Do lookup */ ip_list = lookup_byname_backend(name, &count); if (!ip_list) { nss_status = NSS_STATUS_NOTFOUND; goto out; } /* Copy h_name */ namelen = strlen(name) + 1; if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) { free(ip_list); nss_status = NSS_STATUS_TRYAGAIN; goto out; } memcpy(he->h_name, name, namelen); /* Copy h_addr_list, align to pointer boundary first */ if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0) i = sizeof(char*) - i; if (get_static(&buffer, &buflen, i) == NULL) { free(ip_list); nss_status = NSS_STATUS_TRYAGAIN; goto out; } if ((he->h_addr_list = (char **)get_static( &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL) { free(ip_list); nss_status = NSS_STATUS_TRYAGAIN; goto out; } for (i = 0; i < count; i++) { if ((he->h_addr_list[i] = get_static(&buffer, &buflen, INADDRSZ)) == NULL) { free(ip_list); nss_status = NSS_STATUS_TRYAGAIN; goto out; } memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ); } he->h_addr_list[count] = NULL; free(ip_list); /* Set h_addr_type and h_length */ he->h_addrtype = AF_INET; he->h_length = INADDRSZ; /* Set h_aliases */ if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0) i = sizeof(char*) - i; if (get_static(&buffer, &buflen, i) == NULL) { nss_status = NSS_STATUS_TRYAGAIN; goto out; } if ((he->h_aliases = (char **)get_static( &buffer, &buflen, sizeof(char *))) == NULL) { nss_status = NSS_STATUS_TRYAGAIN; goto out; } he->h_aliases[0] = NULL; nss_status = NSS_STATUS_SUCCESS; out: #if HAVE_PTHREAD pthread_mutex_unlock(&wins_nss_mutex); #endif return nss_status; } NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he, char *buffer, size_t buflen, int *h_errnop) { NSS_STATUS nss_status; if(af!=AF_INET) { *h_errnop = NO_DATA; nss_status = NSS_STATUS_UNAVAIL; } else { nss_status = _nss_wins_gethostbyname_r( name, he, buffer, buflen, h_errnop); } return nss_status; } #endif