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/*
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* resolving DNS hostname routine
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*
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* Copyright (C) 2010 Jeff Layton (jlayton@samba.org)
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* Copyright (C) 2010 Igor Druzhinin (jaxbrigs@gmail.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif /* HAVE_CONFIG_H */
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "mount.h"
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#include "util.h"
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#include "resolve_host.h"
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/*
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* resolve hostname to comma-separated list of address(es)
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*/
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int resolve_host(const char *host, char *addrstr)
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{
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int rc;
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/* 10 for max width of decimal scopeid */
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char tmpbuf[NI_MAXHOST + 1 + 10 + 1];
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const char *ipaddr;
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size_t len;
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struct addrinfo *addrlist, *addr;
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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rc = getaddrinfo(host, NULL, NULL, &addrlist);
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if (rc != 0)
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return EX_USAGE;
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addr = addrlist;
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while (addr) {
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/* skip non-TCP entries */
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if (addr->ai_socktype != SOCK_STREAM ||
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addr->ai_protocol != IPPROTO_TCP) {
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addr = addr->ai_next;
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continue;
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}
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switch (addr->ai_addr->sa_family) {
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *)addr->ai_addr;
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ipaddr = inet_ntop(AF_INET6, &sin6->sin6_addr, tmpbuf,
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sizeof(tmpbuf));
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if (!ipaddr) {
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rc = EX_SYSERR;
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goto resolve_host_out;
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}
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if (sin6->sin6_scope_id) {
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len = strnlen(tmpbuf, sizeof(tmpbuf));
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snprintf(tmpbuf + len, sizeof(tmpbuf) - len, "%%%u",
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sin6->sin6_scope_id);
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}
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break;
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case AF_INET:
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sin = (struct sockaddr_in *)addr->ai_addr;
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ipaddr = inet_ntop(AF_INET, &sin->sin_addr, tmpbuf,
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sizeof(tmpbuf));
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if (!ipaddr) {
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rc = EX_SYSERR;
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goto resolve_host_out;
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}
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break;
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default:
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addr = addr->ai_next;
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continue;
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}
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if (addr == addrlist)
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*addrstr = '\0';
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else
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strlcat(addrstr, ",", MAX_ADDR_LIST_LEN);
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strlcat(addrstr, tmpbuf, MAX_ADDR_LIST_LEN);
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addr = addr->ai_next;
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}
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resolve_host_out:
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freeaddrinfo(addrlist);
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return rc;
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}
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