/* Copyright (C) 1997-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <hesiod.h> #include <netdb.h> #include <netinet/in.h> #include <nss.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "nss_hesiod.h" /* Hesiod uses a format for service entries that differs from the traditional format. We therefore declare our own parser. */ #define ENTNAME servent struct servent_data {}; #define TRAILING_LIST_MEMBER s_aliases #define TRAILING_LIST_SEPARATOR_P isspace #include <nss/nss_files/files-parse.c> #define ISSC_OR_SPACE(c) ((c) == ';' || isspace (c)) LINE_PARSER ("#", STRING_FIELD (result->s_name, ISSC_OR_SPACE, 1); STRING_FIELD (result->s_proto, ISSC_OR_SPACE, 1); INT_FIELD (result->s_port, ISSC_OR_SPACE, 10, 0, htons); ) enum nss_status _nss_hesiod_setservent (int stayopen) { return NSS_STATUS_SUCCESS; } enum nss_status _nss_hesiod_endservent (void) { return NSS_STATUS_SUCCESS; } static enum nss_status lookup (const char *name, const char *type, const char *protocol, struct servent *serv, char *buffer, size_t buflen, int *errnop) { struct parser_data *data = (void *) buffer; size_t linebuflen; void *context; char **list, **item; int parse_res; int found; int olderr = errno; context = _nss_hesiod_init (); if (context == NULL) return NSS_STATUS_UNAVAIL; list = hesiod_resolve (context, name, type); if (list == NULL) { int err = errno; hesiod_end (context); __set_errno (olderr); return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL; } linebuflen = buffer + buflen - data->linebuffer; item = list; found = 0; do { size_t len = strlen (*item) + 1; if (linebuflen < len) { hesiod_free_list (context, list); hesiod_end (context); *errnop = ERANGE; return NSS_STATUS_TRYAGAIN; } memcpy (data->linebuffer, *item, len); parse_res = parse_line (buffer, serv, data, buflen, errnop); if (parse_res == -1) { hesiod_free_list (context, list); hesiod_end (context); return NSS_STATUS_TRYAGAIN; } if (parse_res > 0) found = protocol == NULL || strcasecmp (serv->s_proto, protocol) == 0; ++item; } while (*item != NULL && !found); hesiod_free_list (context, list); hesiod_end (context); if (found == 0) { __set_errno (olderr); return NSS_STATUS_NOTFOUND; } return NSS_STATUS_SUCCESS; } enum nss_status _nss_hesiod_getservbyname_r (const char *name, const char *protocol, struct servent *serv, char *buffer, size_t buflen, int *errnop) { return lookup (name, "service", protocol, serv, buffer, buflen, errnop); } enum nss_status _nss_hesiod_getservbyport_r (const int port, const char *protocol, struct servent *serv, char *buffer, size_t buflen, int *errnop) { char portstr[6]; /* Port numbers are restricted to 16 bits. */ snprintf (portstr, sizeof portstr, "%d", ntohs (port)); return lookup (portstr, "port", protocol, serv, buffer, buflen, errnop); }