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Marc Haber
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305
plugins/getaddrinfo.c
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305
plugins/getaddrinfo.c
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/*
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* This file is part of libESMTP, a library for submission of RFC 2822
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* formatted electronic mail messages using the SMTP protocol described
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* in RFC 2821.
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* Modified by Jeremy T. Bouse for use in Nagios plugins
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*
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* Copyright (C) 2001,2002 Brian Stafford <brian@stafford.uklinux.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* An emulation of the RFC 2553 / Posix getaddrinfo resolver interface.
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*
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* $Id: getaddrinfo.c,v 1.2 2004/12/01 23:54:51 opensides Exp $
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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/* Need to turn off Posix features in glibc to build this */
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#undef _POSIX_C_SOURCE
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#undef _XOPEN_SOURCE
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "gethostbyname.h"
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#include "getaddrinfo.h"
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static struct addrinfo *
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dup_addrinfo (struct addrinfo *info, void *addr, size_t addrlen)
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{
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struct addrinfo *ret;
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ret = malloc (sizeof (struct addrinfo));
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if (ret == NULL)
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return NULL;
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memcpy (ret, info, sizeof (struct addrinfo));
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ret->ai_addr = malloc (addrlen);
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if (ret->ai_addr == NULL)
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{
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free (ret);
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return NULL;
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}
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memcpy (ret->ai_addr, addr, addrlen);
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ret->ai_addrlen = addrlen;
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return ret;
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}
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int
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getaddrinfo (const char *nodename, const char *servname,
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const struct addrinfo *hints, struct addrinfo **res)
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{
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struct hostent *hp;
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struct servent *servent;
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const char *socktype;
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int port;
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struct addrinfo hint, result;
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struct addrinfo *ai, *sai, *eai;
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struct ghbnctx ghbnctx;
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char **addrs;
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int code;
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memset (&result, 0, sizeof result);
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/* default for hints */
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if (hints == NULL)
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{
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memset (&hint, 0, sizeof hint);
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hint.ai_family = PF_UNSPEC;
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hints = &hint;
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}
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result.ai_socktype = hints->ai_socktype;
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/* Note: maintain port in host byte order to make debugging easier */
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if (servname != NULL) {
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if (isdigit (*servname))
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port = strtol (servname, NULL, 10);
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else if ((servent = getservbyname (servname, socktype)) != NULL)
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port = ntohs (servent->s_port);
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else
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return EAI_NONAME;
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}
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/* if nodename == NULL refer to the local host for a client or any
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for a server */
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if (nodename == NULL)
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{
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struct sockaddr_in sin;
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/* check protocol family is PF_UNSPEC or PF_INET - could try harder
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for IPv6 but that's more code than I'm prepared to write */
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if (hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET)
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result.ai_family = AF_INET;
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else
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return EAI_FAMILY;
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sin.sin_family = result.ai_family;
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sin.sin_port = htons (port);
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if (hints->ai_flags & AI_PASSIVE)
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sin.sin_addr.s_addr = htonl (INADDR_ANY);
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else
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sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
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/* Duplicate result and addr and return */
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*res = dup_addrinfo (&result, &sin, sizeof sin);
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return (*res == NULL) ? EAI_MEMORY : 0;
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}
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/* If AI_NUMERIC is specified, use inet_addr to translate numbers and
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dots notation. */
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if (hints->ai_flags & AI_NUMERICHOST)
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{
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struct sockaddr_in sin;
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/* check protocol family is PF_UNSPEC or PF_INET */
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if (hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET)
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result.ai_family = AF_INET;
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else
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return EAI_FAMILY;
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sin.sin_family = result.ai_family;
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sin.sin_port = htons (port);
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sin.sin_addr.s_addr = inet_addr (nodename);
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/* Duplicate result and addr and return */
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*res = dup_addrinfo (&result, &sin, sizeof sin);
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return (*res == NULL) ? EAI_MEMORY : 0;
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}
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errno = 0;
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hp = gethostbyname_ctx (nodename, &ghbnctx);
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if (hp == NULL)
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{
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if (errno != 0)
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{
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free_ghbnctx (&ghbnctx);
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return EAI_SYSTEM;
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}
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code = h_error_ctx (&ghbnctx);
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switch (code)
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{
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case HOST_NOT_FOUND: code = EAI_NODATA; break;
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case NO_DATA: code = EAI_NODATA; break;
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#if defined(NO_ADDRESS) && NO_ADDRESS != NO_DATA
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case NO_ADDRESS: code = EAI_NODATA; break;
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#endif
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case NO_RECOVERY: code = EAI_FAIL; break;
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case TRY_AGAIN: code = EAI_AGAIN; break;
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default: code = EAI_FAIL; break;
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}
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free_ghbnctx (&ghbnctx);
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return code;
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}
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/* Check that the address family is acceptable.
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*/
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switch (hp->h_addrtype)
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{
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case AF_INET:
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if (!(hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET))
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goto eai_family;
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break;
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#ifdef USE_IPV6
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case AF_INET6:
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if (!(hints->ai_family == PF_UNSPEC || hints->ai_family == PF_INET6))
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goto eai_family;
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break;
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#endif
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default:
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eai_family:
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free_ghbnctx (&ghbnctx);
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return EAI_FAMILY;
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}
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/* For each element pointed to by hp, create an element in the
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result linked list. */
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sai = eai = NULL;
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for (addrs = hp->h_addr_list; *addrs != NULL; addrs++)
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{
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struct sockaddr sa;
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size_t addrlen;
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sa.sa_family = hp->h_addrtype;
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switch (hp->h_addrtype)
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{
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case AF_INET:
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((struct sockaddr_in *) &sa)->sin_port = htons (port);
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memcpy (&((struct sockaddr_in *) &sa)->sin_addr,
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*addrs, hp->h_length);
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addrlen = sizeof (struct sockaddr_in);
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break;
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#ifdef USE_IPV6
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case AF_INET6:
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# if SIN6_LEN
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((struct sockaddr_in6 *) &sa)->sin6_len = hp->h_length;
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# endif
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((struct sockaddr_in6 *) &sa)->sin6_port = htons (port);
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memcpy (&((struct sockaddr_in6 *) &sa)->sin6_addr,
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*addrs, hp->h_length);
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addrlen = sizeof (struct sockaddr_in6);
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break;
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#endif
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default:
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continue;
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}
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result.ai_family = hp->h_addrtype;
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ai = dup_addrinfo (&result, &sa, addrlen);
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if (ai == NULL)
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{
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free_ghbnctx (&ghbnctx);
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freeaddrinfo (sai);
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return EAI_MEMORY;
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}
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if (sai == NULL)
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sai = ai;
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else
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eai->ai_next = ai;
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eai = ai;
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}
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if (sai == NULL)
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{
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free_ghbnctx (&ghbnctx);
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return EAI_NODATA;
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}
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if (hints->ai_flags & AI_CANONNAME)
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{
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sai->ai_canonname = malloc (strlen (hp->h_name) + 1);
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if (sai->ai_canonname == NULL)
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{
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free_ghbnctx (&ghbnctx);
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freeaddrinfo (sai);
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return EAI_MEMORY;
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}
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strcpy (sai->ai_canonname, hp->h_name);
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}
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free_ghbnctx (&ghbnctx);
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*res = sai;
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return 0;
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}
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void
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freeaddrinfo (struct addrinfo *ai)
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{
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struct addrinfo *next;
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while (ai != NULL)
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{
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next = ai->ai_next;
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if (ai->ai_canonname != NULL)
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free (ai->ai_canonname);
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if (ai->ai_addr != NULL)
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free (ai->ai_addr);
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free (ai);
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ai = next;
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}
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}
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const char *
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gai_strerror (int ecode)
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{
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static const char *eai_descr[] =
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{
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"no error",
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"address family for nodename not supported", /* EAI_ADDRFAMILY */
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"temporary failure in name resolution", /* EAI_AGAIN */
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"invalid value for ai_flags", /* EAI_BADFLAGS */
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"non-recoverable failure in name resolution", /* EAI_FAIL */
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"ai_family not supported", /* EAI_FAMILY */
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"memory allocation failure", /* EAI_MEMORY */
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"no address associated with nodename", /* EAI_NODATA */
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"nodename nor servname provided, or not known", /* EAI_NONAME */
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"servname not supported for ai_socktype", /* EAI_SERVICE */
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"ai_socktype not supported", /* EAI_SOCKTYPE */
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"system error returned in errno", /* EAI_SYSTEM */
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};
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if (ecode < 0 || ecode > (int) (sizeof eai_descr/ sizeof eai_descr[0]))
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return "unknown error";
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return eai_descr[ecode];
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}
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