Adding upstream version 4.0.upstream/4.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 211 insertions, 0 deletions

diff --git a/nameserv.c b/nameserv.c
new file mode 100644
index 0000000..c87aef0
--- /dev/null
+++ b/nameserv.c
@@ -0,0 +1,211 @@
+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow  1997-2003
+ * Copyright (C) Miroslav Lichvar  2009-2011
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  Functions to do name to IP address conversion
+
+  */
+
+#include "config.h"
+
+#include "sysincl.h"
+
+#include <netdb.h>
+#include <resolv.h>
+
+#include "nameserv.h"
+#include "socket.h"
+#include "util.h"
+
+/* ================================================== */
+
+static int address_family = IPADDR_UNSPEC;
+
+void
+DNS_SetAddressFamily(int family)
+{
+  address_family = family;
+}
+
+DNS_Status 
+DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
+{
+#ifdef HAVE_GETADDRINFO
+  struct addrinfo hints, *res, *ai;
+  int i, result;
+
+  max_addrs = MIN(max_addrs, DNS_MAX_ADDRESSES);
+
+  memset(&hints, 0, sizeof (hints));
+
+  switch (address_family) {
+    case IPADDR_INET4:
+      hints.ai_family = AF_INET;
+      break;
+#ifdef FEAT_IPV6
+    case IPADDR_INET6:
+      hints.ai_family = AF_INET6;
+      break;
+#endif
+    default:
+      hints.ai_family = AF_UNSPEC;
+  }
+  hints.ai_socktype = SOCK_DGRAM;
+
+  result = getaddrinfo(name, NULL, &hints, &res);
+
+  if (result) {
+#ifdef FORCE_DNSRETRY
+    return DNS_TryAgain;
+#else
+    return result == EAI_AGAIN ? DNS_TryAgain : DNS_Failure;
+#endif
+  }
+
+  for (ai = res, i = 0; i < max_addrs && ai != NULL; ai = ai->ai_next) {
+    switch (ai->ai_family) {
+      case AF_INET:
+        if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET4)
+          continue;
+        ip_addrs[i].family = IPADDR_INET4;
+        ip_addrs[i].addr.in4 = ntohl(((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr);
+        i++;
+        break;
+#ifdef FEAT_IPV6
+      case AF_INET6:
+        if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET6)
+          continue;
+        /* Don't return an address that would lose a scope ID */
+        if (((struct sockaddr_in6 *)ai->ai_addr)->sin6_scope_id != 0)
+          continue;
+        ip_addrs[i].family = IPADDR_INET6;
+        memcpy(&ip_addrs[i].addr.in6, &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr.s6_addr,
+               sizeof (ip_addrs->addr.in6));
+        i++;
+        break;
+#endif
+    }
+  }
+
+  for (; i < max_addrs; i++)
+        ip_addrs[i].family = IPADDR_UNSPEC;
+
+  freeaddrinfo(res);
+
+  return !max_addrs || ip_addrs[0].family != IPADDR_UNSPEC ? DNS_Success : DNS_Failure;
+#else
+  struct hostent *host;
+  int i;
+  
+  if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET4)
+    return DNS_Failure;
+
+  max_addrs = MIN(max_addrs, DNS_MAX_ADDRESSES);
+
+  host = gethostbyname(name);
+
+  if (host == NULL) {
+    if (h_errno == TRY_AGAIN)
+      return DNS_TryAgain;
+  } else {
+    if (host->h_addrtype != AF_INET || !host->h_addr_list[0])
+      return DNS_Failure;
+
+    for (i = 0; host->h_addr_list[i] && i < max_addrs; i++) {
+      ip_addrs[i].family = IPADDR_INET4;
+      ip_addrs[i].addr.in4 = ntohl(*(uint32_t *)host->h_addr_list[i]);
+    }
+
+    for (; i < max_addrs; i++)
+      ip_addrs[i].family = IPADDR_UNSPEC;
+
+    return DNS_Success;
+  }
+
+#ifdef FORCE_DNSRETRY
+  return DNS_TryAgain;
+#else
+  return DNS_Failure;
+#endif
+
+#endif
+}
+
+/* ================================================== */
+
+int
+DNS_IPAddress2Name(IPAddr *ip_addr, char *name, int len)
+{
+  char *result = NULL;
+
+#ifdef FEAT_IPV6
+  struct sockaddr_in6 in6;
+  IPSockAddr ip_saddr;
+  socklen_t slen;
+  char hbuf[NI_MAXHOST];
+
+  ip_saddr.ip_addr = *ip_addr;
+  ip_saddr.port = 0;
+
+  slen = SCK_IPSockAddrToSockaddr(&ip_saddr, (struct sockaddr *)&in6, sizeof (in6));
+  if (!getnameinfo((struct sockaddr *)&in6, slen, hbuf, sizeof (hbuf), NULL, 0, 0))
+    result = hbuf;
+#else
+  struct hostent *host;
+  uint32_t addr;
+
+  switch (ip_addr->family) {
+    case IPADDR_INET4:
+      addr = htonl(ip_addr->addr.in4);
+      host = gethostbyaddr((const char *) &addr, sizeof (ip_addr), AF_INET);
+      break;
+#ifdef FEAT_IPV6
+    case IPADDR_INET6:
+      host = gethostbyaddr((const void *) ip_addr->addr.in6, sizeof (ip_addr->addr.in6), AF_INET6);
+      break;
+#endif
+    default:
+      host = NULL;
+  }
+  if (host)
+    result = host->h_name;
+#endif
+
+  if (result == NULL)
+    result = UTI_IPToString(ip_addr);
+  if (snprintf(name, len, "%s", result) >= len)
+    return 0;
+
+  return 1;
+}
+
+/* ================================================== */
+
+void
+DNS_Reload(void)
+{
+  res_init();
+}
+
+/* ================================================== */
+