cleanup: Log at ERROR level when connect() fails.

Failure is defined as either being passed an invalid IP/Port, or some
unexpected error code.

auto_tests/TCP_test.c

@@ -1,3 +1,4 @@
+#include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -8,7 +9,7 @@
 #include "../toxcore/crypto_core.h"
 #include "../toxcore/mono_time.h"
 #include "../toxcore/util.h"
-#include "check_compat.h"
+#include "auto_test_support.h"
 
 #define NUM_PORTS 3
 
@@ -46,6 +47,7 @@ static void test_basic(void)
 {
     Mono_Time *mono_time = mono_time_new();
     Logger *logger = logger_new();
+    logger_callback_log(logger, (logger_cb *)print_debug_log, nullptr, nullptr);
 
     // Attempt to create a new TCP_Server instance.
     uint8_t self_public_key[CRYPTO_PUBLIC_KEY_SIZE];
@@ -65,8 +67,8 @@ static void test_basic(void)
     for (uint8_t i = 0; i < NUM_PORTS; i++) {
         sock = net_socket(net_family_ipv6, TOX_SOCK_STREAM, TOX_PROTO_TCP);
         localhost.port = net_htons(ports[i]);
-        int ret = net_connect(logger, sock, &localhost);
-        ck_assert_msg(ret == 0, "Failed to connect to created TCP relay server on port %d.", ports[i]);
+        bool ret = net_connect(logger, sock, &localhost);
+        ck_assert_msg(ret, "Failed to connect to created TCP relay server on port %d (%d).", ports[i], errno);
 
         // Leave open one connection for the next test.
         if (i + 1 < NUM_PORTS) {
@@ -194,8 +196,8 @@ static struct sec_TCP_con *new_TCP_con(const Logger *logger, TCP_Server *tcp_s,
     localhost.ip = get_loopback();
     localhost.port = net_htons(ports[random_u32() % NUM_PORTS]);
 
-    int ret = net_connect(logger, sock, &localhost);
-    ck_assert_msg(ret == 0, "Failed to connect to the test TCP relay server.");
+    bool ok = net_connect(logger, sock, &localhost);
+    ck_assert_msg(ok, "Failed to connect to the test TCP relay server.");
 
     uint8_t f_secret_key[CRYPTO_SECRET_KEY_SIZE];
     crypto_new_keypair(sec_c->public_key, f_secret_key);
@@ -209,7 +211,7 @@ static struct sec_TCP_con *new_TCP_con(const Logger *logger, TCP_Server *tcp_s,
     memcpy(handshake, sec_c->public_key, CRYPTO_PUBLIC_KEY_SIZE);
     random_nonce(handshake + CRYPTO_PUBLIC_KEY_SIZE);
 
-    ret = encrypt_data(tcp_server_public_key(tcp_s), f_secret_key, handshake + CRYPTO_PUBLIC_KEY_SIZE, handshake_plain,
+    int ret = encrypt_data(tcp_server_public_key(tcp_s), f_secret_key, handshake + CRYPTO_PUBLIC_KEY_SIZE, handshake_plain,
                            TCP_HANDSHAKE_PLAIN_SIZE, handshake + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE);
     ck_assert_msg(ret == TCP_CLIENT_HANDSHAKE_SIZE - (CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE),
                   "Failed to encrypt the outgoing handshake.");

other/bootstrap_daemon/docker/tox-bootstrapd.sha256

@@ -1 +1 @@
-6b4d6b18a788c6a400b05f78de42717a4c6c588c920ed967527def7fc2b03740  /usr/local/bin/tox-bootstrapd
+eb9e7efd034de17ba6af095bbfd595308ff994148f394e715087078859d860f6  /usr/local/bin/tox-bootstrapd

toxcore/TCP_client.c

@@ -98,16 +98,11 @@ void tcp_con_set_custom_uint(TCP_Client_Connection *con, uint32_t value)
 non_null()
 static bool connect_sock_to(const Logger *logger, Socket sock, const IP_Port *ip_port, const TCP_Proxy_Info *proxy_info)
 {
-    IP_Port ipp_copy = *ip_port;
-
     if (proxy_info->proxy_type != TCP_PROXY_NONE) {
-        ipp_copy = proxy_info->ip_port;
+        return net_connect(logger, sock, &proxy_info->ip_port);
+    } else {
+        return net_connect(logger, sock, ip_port);
     }
-
-    /* nonblocking socket, connect will never return success */
-    net_connect(logger, sock, &ipp_copy);
-
-    return true;
 }
 
 /** return 1 on success.

toxcore/network.c

@@ -120,6 +120,11 @@ static bool should_ignore_recv_error(int err)
     return err == EWOULDBLOCK;
 }
 
+static bool should_ignore_connect_error(int err)
+{
+    return err == EWOULDBLOCK || err == EINPROGRESS || err == EAGAIN;
+}
+
 non_null()
 static const char *inet_ntop4(const struct in_addr *addr, char *buf, size_t bufsize)
 {
@@ -156,6 +161,11 @@ static bool should_ignore_recv_error(int err)
     return err == WSAEWOULDBLOCK || err == WSAECONNRESET;
 }
 
+static bool should_ignore_connect_error(int err)
+{
+    return err == WSAEWOULDBLOCK || err == WSAEINPROGRESS;
+}
+
 non_null()
 static const char *inet_ntop4(const struct in_addr *addr, char *buf, size_t bufsize)
 {
@@ -1421,7 +1431,7 @@ bool addr_resolve_or_parse_ip(const char *address, IP *to, IP *extra)
     return true;
 }
 
-int net_connect(const Logger *log, Socket sock, const IP_Port *ip_port)
+bool net_connect(const Logger *log, Socket sock, const IP_Port *ip_port)
 {
     struct sockaddr_storage addr = {0};
     size_t addrsize;
@@ -1441,14 +1451,32 @@ int net_connect(const Logger *log, Socket sock, const IP_Port *ip_port)
         fill_addr6(&ip_port->ip.ip.v6, &addr6->sin6_addr);
         addr6->sin6_port = ip_port->port;
     } else {
-        return 0;
+        char ip_str[IP_NTOA_LEN];
+        LOGGER_ERROR(log, "cannot connect to %s:%d which is neither IPv4 nor IPv6",
+                ip_ntoa(&ip_port->ip, ip_str, sizeof(ip_str)), ip_port->port);
+        return false;
     }
 
 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
-    return 0;
+    return true;
 #else
     LOGGER_DEBUG(log, "connecting socket %d", (int)sock.socket);
-    return connect(sock.socket, (struct sockaddr *)&addr, addrsize);
+    errno = 0;
+    if (connect(sock.socket, (struct sockaddr *)&addr, addrsize) == -1) {
+        const int error = net_error();
+
+        // Non-blocking socket: "Operation in progress" means it's connecting.
+        if (!should_ignore_connect_error(error)) {
+            char *net_strerror = net_new_strerror(error);
+            char ip_str[IP_NTOA_LEN];
+            LOGGER_ERROR(log, "failed to connect to %s:%d: %d (%s)",
+                    ip_ntoa(&ip_port->ip, ip_str, sizeof(ip_str)), ip_port->port,
+                    error, net_strerror);
+            net_kill_strerror(net_strerror);
+            return false;
+        }
+    }
+    return true;
 #endif
 }
 

toxcore/network.h

@@ -428,11 +428,11 @@ void networking_poll(const Networking_Core *net, void *userdata);
 
 /** Connect a socket to the address specified by the ip_port.
  *
- * Return 0 on success.
- * Return -1 on failure.
+ * Return true on success.
+ * Return false on failure.
  */
 non_null()
-int net_connect(const Logger *log, Socket sock, const IP_Port *ip_port);
+bool net_connect(const Logger *log, Socket sock, const IP_Port *ip_port);
 
 /** High-level getaddrinfo implementation.
  * Given node, which identifies an Internet host, net_getipport() fills an array

toxcore/onion.c

@@ -8,6 +8,7 @@
  */
 #include "onion.h"
 
+#include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -473,9 +474,7 @@ static int handle_send_2(void *object, const IP_Port *source, const uint8_t *pac
         return 1;
     }
 
-    if (len <= SIZE_IPPORT) {
-        return 1;
-    }
+    assert(len > SIZE_IPPORT);
 
     const uint8_t packet_id = plain[SIZE_IPPORT];