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