d4af9e693f
I have worked hard to reduce diffs against the vendor branch. One notable change in that respect is that we no longer prefer DSA over RSA - the reasons for doing so went away years ago. This may cause some surprises, as ssh will warn about unknown host keys even for hosts whose keys haven't changed. MFC after: 6 weeks
236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/*
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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 "includes.h"
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#include <stdlib.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#ifndef HAVE_GETNAMEINFO
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int getnameinfo(const struct sockaddr *sa, size_t 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 (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET)
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return (EAI_FAMILY);
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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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case EAI_FAMILY:
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return ("ai_family not supported");
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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 (hints && hints->ai_family != AF_UNSPEC &&
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hints->ai_family != AF_INET)
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return (EAI_FAMILY);
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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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