diff options
Diffstat (limited to 'nis/nss_nis/nis-hosts.c')
| -rw-r--r-- | nis/nss_nis/nis-hosts.c | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/nis/nss_nis/nis-hosts.c b/nis/nss_nis/nis-hosts.c new file mode 100644 index 0000000000..9adce18ca3 --- /dev/null +++ b/nis/nss_nis/nis-hosts.c @@ -0,0 +1,389 @@ +/* Copyright (C) 1996 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <nss.h> +#include <ctype.h> +#include <netdb.h> +#include <string.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <resolv.h> +#include <libc-lock.h> +#include <rpcsvc/yp.h> +#include <rpcsvc/ypclnt.h> + +#include "nss-nis.h" + +/* Get implementation for some internal functions. */ +#include "../../resolv/mapv4v6addr.h" +#include "../../resolv/mapv4v6hostent.h" + +#define ENTNAME hostent +#define DATABASE "hosts" +#define NEED_H_ERRNO + +#define ENTDATA hostent_data +struct hostent_data + { + unsigned char host_addr[16]; /* IPv4 or IPv6 address. */ + char *h_addr_ptrs[2]; /* Points to that and null terminator. */ + }; + +#define TRAILING_LIST_MEMBER h_aliases +#define TRAILING_LIST_SEPARATOR_P isspace +#include "../../nss/nss_files/files-parse.c" +LINE_PARSER +("#", + { + char *addr; + + STRING_FIELD (addr, isspace, 1); + + /* Parse address. */ + if ((_res.options & RES_USE_INET6) + && inet_pton (AF_INET6, addr, entdata->host_addr) > 0) + { + result->h_addrtype = AF_INET6; + result->h_length = IN6ADDRSZ; + } + else + if (inet_pton (AF_INET, addr, entdata->host_addr) > 0) + { + if (_res.options & RES_USE_INET6) + { + map_v4v6_address ((char *) entdata->host_addr, + (char *) entdata->host_addr); + result->h_addrtype = AF_INET6; + result->h_length = IN6ADDRSZ; + } + else + { + result->h_addrtype = AF_INET; + result->h_length = INADDRSZ; + } + } + else + /* Illegal address: ignore line. */ + return 0; + + /* Store a pointer to the address in the expected form. */ + entdata->h_addr_ptrs[0] = entdata->host_addr; + entdata->h_addr_ptrs[1] = NULL; + result->h_addr_list = entdata->h_addr_ptrs; + + /* If we need the host entry in IPv6 form change it now. */ + if (_res.options & RES_USE_INET6) + { + char *bufptr = data->linebuffer; + size_t buflen = (char *) data + datalen - bufptr; + map_v4v6_hostent (result, &bufptr, &buflen); + } + + STRING_FIELD (result->h_name, isspace, 1); + } +) + +__libc_lock_define_initialized (static, lock) + +static bool_t new_start = 1; +static char *oldkey = NULL; +static int oldkeylen = 0; + +enum nss_status +_nss_nis_sethostent (void) +{ + __libc_lock_lock (lock); + + new_start = 1; + if (oldkey != NULL) + { + free (oldkey); + oldkey = NULL; + oldkeylen = 0; + } + + __libc_lock_unlock (lock); + + return NSS_STATUS_SUCCESS; +} + +enum nss_status +_nss_nis_endhostent (void) +{ + __libc_lock_lock (lock); + + new_start = 1; + if (oldkey != NULL) + { + free (oldkey); + oldkey = NULL; + oldkeylen = 0; + } + + __libc_lock_unlock (lock); + + return NSS_STATUS_SUCCESS; +} + +static enum nss_status +internal_nis_gethostent_r (struct hostent *host, char *buffer, + size_t buflen, int *h_errnop) +{ + char *domain; + char *result; + int len, parse_res; + char *outkey; + int keylen; + struct parser_data *data = (void *) buffer; + size_t linebuflen = buffer + buflen - data->linebuffer; + + if (yp_get_default_domain (&domain)) + return NSS_STATUS_UNAVAIL; + + if (buflen < sizeof *data + 1) + { + __set_errno (ERANGE); + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + /* Get the next entry until we found a correct one. */ + do + { + enum nss_status retval; + char *p; + + if (new_start) + retval = yperr2nss (yp_first (domain, "hosts.byname", + &outkey, &keylen, &result, &len)); + else + retval = yperr2nss ( yp_next (domain, "hosts.byname", + oldkey, oldkeylen, + &outkey, &keylen, &result, &len)); + + if (retval != NSS_STATUS_SUCCESS) + { + switch (retval) + { + case NSS_STATUS_TRYAGAIN: + __set_errno (EAGAIN); + *h_errnop = TRY_AGAIN; + break; + case NSS_STATUS_NOTFOUND: + *h_errnop = HOST_NOT_FOUND; + break; + default: + *h_errnop = NO_RECOVERY; + break; + } + return retval; + } + + if (len + 1 > linebuflen) + { + free (result); + *h_errnop = NETDB_INTERNAL; + __set_errno (ERANGE); + return NSS_STATUS_TRYAGAIN; + } + + p = strncpy (data->linebuffer, result, len); + data->linebuffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + parse_res = parse_line (p, host, data, buflen); + if (!parse_res && errno == ERANGE) + { + *h_errnop = NETDB_INTERNAL;; + return NSS_STATUS_TRYAGAIN; + } + free (oldkey); + oldkey = outkey; + oldkeylen = keylen; + new_start = 0; + } + while (!parse_res); + + *h_errnop = NETDB_SUCCESS; + return NSS_STATUS_SUCCESS; +} + +int +_nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen, + int *h_errnop) +{ + int status; + + __libc_lock_lock (lock); + + status = internal_nis_gethostent_r (host, buffer, buflen, h_errnop); + + __libc_lock_unlock (lock); + + return status; +} + +enum nss_status +_nss_nis_gethostbyname_r (const char *name, struct hostent *host, + char *buffer, size_t buflen, int *h_errnop) +{ + enum nss_status retval; + char *domain, *result, *p; + int len, parse_res; + struct parser_data *data = (void *) buffer; + size_t linebuflen = buffer + buflen - data->linebuffer; + + if (name == NULL) + { + __set_errno (EINVAL); + return NSS_STATUS_UNAVAIL; + } + + if (yp_get_default_domain (&domain)) + return NSS_STATUS_UNAVAIL; + + if (buflen < sizeof *data + 1) + { + *h_errnop = NETDB_INTERNAL; + __set_errno (ERANGE); + return NSS_STATUS_TRYAGAIN; + } + retval = yperr2nss (yp_match (domain, "hosts.byname", name, + strlen (name), &result, &len)); + + if (retval != NSS_STATUS_SUCCESS) + { + if (retval == NSS_STATUS_TRYAGAIN) + { + *h_errnop = TRY_AGAIN; + __set_errno (EAGAIN); + } + if (retval == NSS_STATUS_NOTFOUND) + *h_errnop = HOST_NOT_FOUND; + return retval; + } + + if (len + 1 > linebuflen) + { + free (result); + *h_errnop = NETDB_INTERNAL; + __set_errno (ERANGE); + return NSS_STATUS_TRYAGAIN; + } + + p = strncpy (data->linebuffer, result, len); + data->linebuffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + parse_res = parse_line (p, host, data, buflen); + + if (!parse_res) + { + if (errno == ERANGE) + { + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + else + { + *h_errnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + } + + *h_errnop = NETDB_SUCCESS; + return NSS_STATUS_SUCCESS; +} + +enum nss_status +_nss_nis_gethostbyaddr_r (char *addr, int addrlen, int type, + struct hostent *host, char *buffer, size_t buflen, + int *h_errnop) +{ + enum nss_status retval; + char *domain, *result, *p; + int len, parse_res; + char *buf; + struct parser_data *data = (void *) buffer; + size_t linebuflen = buffer + buflen - data->linebuffer; + + if (yp_get_default_domain (&domain)) + return NSS_STATUS_UNAVAIL; + + if (buflen < sizeof *data + 1) + { + __set_errno (ERANGE); + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + buf = inet_ntoa (*(struct in_addr *) addr); + + retval = yperr2nss (yp_match (domain, "hosts.byaddr", buf, + strlen (buf), &result, &len)); + + if (retval != NSS_STATUS_SUCCESS) + { + if (retval == NSS_STATUS_TRYAGAIN) + { + *h_errnop = TRY_AGAIN; + __set_errno (EAGAIN); + } + if (retval == NSS_STATUS_NOTFOUND) + *h_errnop = HOST_NOT_FOUND; + return retval; + } + + if (len + 1 > linebuflen) + { + free (result); + __set_errno (ERANGE); + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + p = strncpy (data->linebuffer, result, len); + data->linebuffer[len] = '\0'; + while (isspace (*p)) + ++p; + free (result); + + parse_res = parse_line (p, host, data, buflen); + + if (!parse_res) + { + if (errno == ERANGE) + { + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + else + { + *h_errnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + } + + *h_errnop = NETDB_SUCCESS; + return NSS_STATUS_SUCCESS; +} |