From 87356242baf10c8b2a94d9013e436ed2a0dada53 Mon Sep 17 00:00:00 2001
From: Bernhard Schmidt <berni@debian.org>
Date: Wed, 20 Feb 2019 14:11:46 +0100
Subject: New upstream version 2.4.7

---
 src/openvpn/socket.c | 140 ++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 128 insertions(+), 12 deletions(-)

(limited to 'src/openvpn/socket.c')

diff --git a/src/openvpn/socket.c b/src/openvpn/socket.c
index 211e744..c76d206 100644
--- a/src/openvpn/socket.c
+++ b/src/openvpn/socket.c
@@ -74,12 +74,116 @@ sf2gaf(const unsigned int getaddr_flags,
 /*
  * Functions related to the translation of DNS names to IP addresses.
  */
+static int
+get_addr_generic(sa_family_t af, unsigned int flags, const char *hostname,
+                 void *network, unsigned int *netbits,
+                 int resolve_retry_seconds, volatile int *signal_received,
+                 int msglevel)
+{
+    char *endp, *sep, *var_host = NULL;
+    struct addrinfo *ai = NULL;
+    unsigned long bits;
+    uint8_t max_bits;
+    int ret = -1;
+
+    if (!hostname)
+    {
+        msg(M_NONFATAL, "Can't resolve null hostname!");
+        goto out;
+    }
+
+    /* assign family specific default values */
+    switch (af)
+    {
+        case AF_INET:
+            bits = 0;
+            max_bits = sizeof(in_addr_t) * 8;
+            break;
+        case AF_INET6:
+            bits = 64;
+            max_bits = sizeof(struct in6_addr) * 8;
+            break;
+        default:
+            msg(M_WARN,
+                "Unsupported AF family passed to getaddrinfo for %s (%d)",
+                hostname, af);
+            goto out;
+    }
+
+    /* we need to modify the hostname received as input, but we don't want to
+     * touch it directly as it might be a constant string.
+     *
+     * Therefore, we clone the string here and free it at the end of the
+     * function */
+    var_host = strdup(hostname);
+    if (!var_host)
+    {
+        msg(M_NONFATAL | M_ERRNO,
+            "Can't allocate hostname buffer for getaddrinfo");
+        goto out;
+    }
+
+    /* check if this hostname has a /bits suffix */
+    sep = strchr(var_host , '/');
+    if (sep)
+    {
+        bits = strtoul(sep + 1, &endp, 10);
+        if ((*endp != '\0') || (bits > max_bits))
+        {
+            msg(msglevel, "IP prefix '%s': invalid '/bits' spec (%s)", hostname,
+                sep + 1);
+            goto out;
+        }
+        *sep = '\0';
+    }
+
+    ret = openvpn_getaddrinfo(flags & ~GETADDR_HOST_ORDER, var_host, NULL,
+                              resolve_retry_seconds, signal_received, af, &ai);
+    if ((ret == 0) && network)
+    {
+        struct in6_addr *ip6;
+        in_addr_t *ip4;
+
+        switch (af)
+        {
+            case AF_INET:
+                ip4 = network;
+                *ip4 = ((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr;
+
+                if (flags & GETADDR_HOST_ORDER)
+                {
+                    *ip4 = ntohl(*ip4);
+                }
+                break;
+            case AF_INET6:
+                ip6 = network;
+                *ip6 = ((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
+                break;
+            default:
+                /* can't get here because 'af' was previously checked */
+                msg(M_WARN,
+                    "Unsupported AF family for %s (%d)", var_host, af);
+                goto out;
+        }
+    }
+
+    if (netbits)
+    {
+        *netbits = bits;
+    }
+
+    /* restore '/' separator, if any */
+    if (sep)
+    {
+        *sep = '/';
+    }
+out:
+    freeaddrinfo(ai);
+    free(var_host);
+
+    return ret;
+}
 
-/*
- * Translate IP addr or hostname to in_addr_t.
- * If resolve error, try again for
- * resolve_retry_seconds seconds.
- */
 in_addr_t
 getaddr(unsigned int flags,
         const char *hostname,
@@ -87,20 +191,19 @@ getaddr(unsigned int flags,
         bool *succeeded,
         volatile int *signal_received)
 {
-    struct addrinfo *ai;
+    in_addr_t addr;
     int status;
-    status = openvpn_getaddrinfo(flags & ~GETADDR_HOST_ORDER, hostname, NULL,
-                                 resolve_retry_seconds, signal_received, AF_INET, &ai);
+
+    status = get_addr_generic(AF_INET, flags, hostname, &addr, NULL,
+                              resolve_retry_seconds, signal_received,
+                              M_WARN);
     if (status==0)
     {
-        struct in_addr ia;
         if (succeeded)
         {
             *succeeded = true;
         }
-        ia = ((struct sockaddr_in *)ai->ai_addr)->sin_addr;
-        freeaddrinfo(ai);
-        return (flags & GETADDR_HOST_ORDER) ? ntohl(ia.s_addr) : ia.s_addr;
+        return addr;
     }
     else
     {
@@ -112,6 +215,19 @@ getaddr(unsigned int flags,
     }
 }
 
+bool
+get_ipv6_addr(const char *hostname, struct in6_addr *network,
+              unsigned int *netbits, int msglevel)
+{
+    if (get_addr_generic(AF_INET6, GETADDR_RESOLVE, hostname, network, netbits,
+                         0, NULL, msglevel) < 0)
+    {
+        return false;
+    }
+
+    return true;                /* parsing OK, values set */
+}
+
 static inline bool
 streqnull(const char *a, const char *b)
 {
-- 
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