230 lines
6.1 KiB
C
230 lines
6.1 KiB
C
/* From openssh 4.3p2 filename openbsd-compat/fake-rfc2553.h */
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/*
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* Copyright (C) 2000-2003 Damien Miller. All rights reserved.
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* Copyright (C) 1999 WIDE Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Pseudo-implementation of RFC2553 name / address resolution functions
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*
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* But these functions are not implemented correctly. The minimum subset
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* is implemented for ssh use only. For example, this routine assumes
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* that ai_family is AF_INET. Don't use it for another purpose.
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*/
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#include <ldns/config.h>
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#include <ldns/common.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "compat/fake-rfc2553.h"
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#ifndef HAVE_GETNAMEINFO
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int getnameinfo(const struct sockaddr *sa, size_t ATTR_UNUSED(salen), char *host,
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size_t hostlen, char *serv, size_t servlen, int flags)
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{
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struct sockaddr_in *sin = (struct sockaddr_in *)sa;
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struct hostent *hp;
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char tmpserv[16];
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if (serv != NULL) {
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snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
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if (strlcpy(serv, tmpserv, servlen) >= servlen)
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return (EAI_MEMORY);
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}
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if (host != NULL) {
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if (flags & NI_NUMERICHOST) {
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if (strlcpy(host, inet_ntoa(sin->sin_addr),
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hostlen) >= hostlen)
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return (EAI_MEMORY);
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else
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return (0);
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} else {
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hp = gethostbyaddr((char *)&sin->sin_addr,
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sizeof(struct in_addr), AF_INET);
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if (hp == NULL)
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return (EAI_NODATA);
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if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
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return (EAI_MEMORY);
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else
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return (0);
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}
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}
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return (0);
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}
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#endif /* !HAVE_GETNAMEINFO */
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#ifndef HAVE_GAI_STRERROR
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#ifdef HAVE_CONST_GAI_STRERROR_PROTO
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const char *
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#else
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char *
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#endif
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gai_strerror(int err)
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{
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switch (err) {
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case EAI_NODATA:
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return ("no address associated with name");
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case EAI_MEMORY:
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return ("memory allocation failure.");
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case EAI_NONAME:
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return ("nodename nor servname provided, or not known");
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default:
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return ("unknown/invalid error.");
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}
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}
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#endif /* !HAVE_GAI_STRERROR */
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#ifndef HAVE_FREEADDRINFO
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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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for(; ai != NULL;) {
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next = ai->ai_next;
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free(ai);
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ai = next;
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}
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}
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#endif /* !HAVE_FREEADDRINFO */
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#ifndef HAVE_GETADDRINFO
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static struct
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addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints)
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{
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struct addrinfo *ai;
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ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in));
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if (ai == NULL)
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return (NULL);
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memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in));
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ai->ai_addr = (struct sockaddr *)(ai + 1);
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/* XXX -- ssh doesn't use sa_len */
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ai->ai_addrlen = sizeof(struct sockaddr_in);
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ai->ai_addr->sa_family = ai->ai_family = AF_INET;
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((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
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((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
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/* XXX: the following is not generally correct, but does what we want */
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if (hints->ai_socktype)
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ai->ai_socktype = hints->ai_socktype;
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else
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ai->ai_socktype = SOCK_STREAM;
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if (hints->ai_protocol)
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ai->ai_protocol = hints->ai_protocol;
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return (ai);
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}
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int
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getaddrinfo(const char *hostname, 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 *sp;
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struct in_addr in;
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int i;
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long int port;
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u_long addr;
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port = 0;
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if (servname != NULL) {
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char *cp;
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port = strtol(servname, &cp, 10);
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if (port > 0 && port <= 65535 && *cp == '\0')
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port = htons(port);
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else if ((sp = getservbyname(servname, NULL)) != NULL)
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port = sp->s_port;
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else
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port = 0;
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}
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if (hints && hints->ai_flags & AI_PASSIVE) {
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addr = htonl(0x00000000);
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if (hostname && inet_aton(hostname, &in) != 0)
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addr = in.s_addr;
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*res = malloc_ai(port, addr, hints);
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if (*res == NULL)
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return (EAI_MEMORY);
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return (0);
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}
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if (!hostname) {
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*res = malloc_ai(port, htonl(0x7f000001), hints);
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if (*res == NULL)
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return (EAI_MEMORY);
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return (0);
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}
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if (inet_aton(hostname, &in)) {
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*res = malloc_ai(port, in.s_addr, hints);
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if (*res == NULL)
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return (EAI_MEMORY);
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return (0);
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}
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/* Don't try DNS if AI_NUMERICHOST is set */
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if (hints && hints->ai_flags & AI_NUMERICHOST)
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return (EAI_NONAME);
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hp = gethostbyname(hostname);
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if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
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struct addrinfo *cur, *prev;
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cur = prev = *res = NULL;
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for (i = 0; hp->h_addr_list[i]; i++) {
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struct in_addr *in = (struct in_addr *)hp->h_addr_list[i];
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cur = malloc_ai(port, in->s_addr, hints);
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if (cur == NULL) {
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if (*res != NULL)
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freeaddrinfo(*res);
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return (EAI_MEMORY);
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}
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if (prev)
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prev->ai_next = cur;
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else
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*res = cur;
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prev = cur;
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}
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return (0);
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}
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return (EAI_NODATA);
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}
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#endif /* !HAVE_GETADDRINFO */
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