From 78d5b74dcee1208efe19dd115006034501c4380f Mon Sep 17 00:00:00 2001
From: iphydf <iphydf@users.noreply.github.com>
Date: Tue, 27 Feb 2018 04:44:18 +0000
Subject: [PATCH] Simplify sendpacket function, deduplicate some logic.

---
 toxcore/network.c | 53 ++++++++++++++++++++---------------------------
 1 file changed, 23 insertions(+), 30 deletions(-)

diff --git a/toxcore/network.c b/toxcore/network.c
index e9c82c39..3aaeb075 100644
--- a/toxcore/network.c
+++ b/toxcore/network.c
@@ -423,7 +423,7 @@ uint16_t net_port(const Networking_Core *net)
  */
 int sendpacket(Networking_Core *net, IP_Port ip_port, const uint8_t *data, uint16_t length)
 {
-    if (net->family == 0) { /* Socket not initialized */
+    if (net->family == TOX_AF_UNSPEC) { /* Socket not initialized */
         return -1;
     }
 
@@ -436,42 +436,35 @@ int sendpacket(Networking_Core *net, IP_Port ip_port, const uint8_t *data, uint1
 
     size_t addrsize = 0;
 
+    if (ip_port.ip.family == TOX_AF_INET && net->family == TOX_AF_INET6) {
+        /* must convert to IPV4-in-IPV6 address */
+        IP6 ip6;
+
+        /* there should be a macro for this in a standards compliant
+         * environment, not found */
+        ip6.uint32[0] = 0;
+        ip6.uint32[1] = 0;
+        ip6.uint32[2] = net_htonl(0xFFFF);
+        ip6.uint32[3] = ip_port.ip.ip.v4.uint32;
+
+        ip_port.ip.family = TOX_AF_INET6;
+        ip_port.ip.ip.v6 = ip6;
+    }
+
     if (ip_port.ip.family == TOX_AF_INET) {
-        if (net->family == TOX_AF_INET6) {
-            /* must convert to IPV4-in-IPV6 address */
-            struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
+        struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr;
 
-            addrsize = sizeof(struct sockaddr_in6);
-            addr6->sin6_family = AF_INET6;
-            addr6->sin6_port = ip_port.port;
-
-            /* there should be a macro for this in a standards compliant
-             * environment, not found */
-            IP6 ip6;
-
-            ip6.uint32[0] = 0;
-            ip6.uint32[1] = 0;
-            ip6.uint32[2] = net_htonl(0xFFFF);
-            ip6.uint32[3] = ip_port.ip.ip.v4.uint32;
-            fill_addr6(ip6, &addr6->sin6_addr);
-
-            addr6->sin6_flowinfo = 0;
-            addr6->sin6_scope_id = 0;
-        } else {
-            struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr;
-
-            addrsize = sizeof(struct sockaddr_in);
-            addr4->sin_family = AF_INET;
-            fill_addr4(ip_port.ip.ip.v4, &addr4->sin_addr);
-            addr4->sin_port = ip_port.port;
-        }
+        addrsize = sizeof(struct sockaddr_in);
+        fill_addr4(ip_port.ip.ip.v4, &addr4->sin_addr);
+        addr4->sin_family = AF_INET;
+        addr4->sin_port = ip_port.port;
     } else if (ip_port.ip.family == TOX_AF_INET6) {
         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
 
         addrsize = sizeof(struct sockaddr_in6);
+        fill_addr6(ip_port.ip.ip.v6, &addr6->sin6_addr);
         addr6->sin6_family = AF_INET6;
         addr6->sin6_port = ip_port.port;
-        fill_addr6(ip_port.ip.ip.v6, &addr6->sin6_addr);
 
         addr6->sin6_flowinfo = 0;
         addr6->sin6_scope_id = 0;
@@ -480,7 +473,7 @@ int sendpacket(Networking_Core *net, IP_Port ip_port, const uint8_t *data, uint1
         return -1;
     }
 
-    int res = sendto(net->sock, (const char *) data, length, 0, (struct sockaddr *)&addr, addrsize);
+    const int res = sendto(net->sock, (const char *) data, length, 0, (struct sockaddr *)&addr, addrsize);
 
     loglogdata(net->log, "O=>", data, length, ip_port, res);