From b2dfc6d1b697da2e649b04ad0b8c3aef7a7d4d88 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 15 May 2015 20:15:59 +0200
Subject: [PATCH] socket-util: socket_address_parse() should not log errors on
 its own

Given that socket_address_parse() is mostly a "library" call it
shouldn't log on its own, but leave that to its caller.

This patch removes logging from the call in case IPv6 is not available
but and IPv6 address shall be parsed. Instead a new call
socket_address_parse_and_warn() is introduced which first invokes
socket_address_parse() and then logs if necessary.

This should fix "make check" on ipv6-less kernels:

http://lists.freedesktop.org/archives/systemd-devel/2015-April/031385.html
(cherry picked from commit 7693146dee53a2b0f524e977188347166bf454ca)

Related: #1497639
---
 src/core/load-fragment.c |  2 +-
 src/shared/socket-util.c | 29 +++++++++++++++++++----------
 src/shared/socket-util.h |  1 +
 3 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 58e44b89b2..0c0fa0f506 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -365,7 +365,7 @@ int config_parse_socket_listen(const char *unit,
                         log_syntax(unit, LOG_ERR, filename, line, -r,
                                    "Failed to resolve unit specifiers on %s, ignoring: %s", rvalue, strerror(-r));
 
-                r = socket_address_parse(&p->address, k ? k : rvalue);
+                r = socket_address_parse_and_warn(&p->address, k ? k : rvalue);
                 if (r < 0) {
                         if (r != -EAFNOSUPPORT)
                                 log_syntax(unit, LOG_ERR, filename, line, -r,
diff --git a/src/shared/socket-util.c b/src/shared/socket-util.c
index baab6353e1..b14e368176 100644
--- a/src/shared/socket-util.c
+++ b/src/shared/socket-util.c
@@ -55,11 +55,6 @@ int socket_address_parse(SocketAddress *a, const char *s) {
         if (*s == '[') {
                 /* IPv6 in [x:.....:z]:p notation */
 
-                if (!socket_ipv6_is_supported()) {
-                        log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
-                        return -EAFNOSUPPORT;
-                }
-
                 e = strchr(s+1, ']');
                 if (!e)
                         return -EINVAL;
@@ -144,11 +139,6 @@ int socket_address_parse(SocketAddress *a, const char *s) {
                                 if (idx == 0)
                                         return -EINVAL;
 
-                                if (!socket_ipv6_is_supported()) {
-                                        log_warning("Binding to interface is not available since kernel does not support IPv6.");
-                                        return -EAFNOSUPPORT;
-                                }
-
                                 a->sockaddr.in6.sin6_family = AF_INET6;
                                 a->sockaddr.in6.sin6_port = htons((uint16_t) u);
                                 a->sockaddr.in6.sin6_scope_id = idx;
@@ -182,6 +172,25 @@ int socket_address_parse(SocketAddress *a, const char *s) {
         return 0;
 }
 
+int socket_address_parse_and_warn(SocketAddress *a, const char *s) {
+        SocketAddress b;
+        int r;
+
+        /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */
+
+        r = socket_address_parse(&b, s);
+        if (r < 0)
+                return r;
+
+        if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) {
+                log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
+                return -EAFNOSUPPORT;
+        }
+
+        *a = b;
+        return 0;
+}
+
 int socket_address_parse_netlink(SocketAddress *a, const char *s) {
         int family;
         unsigned group = 0;
diff --git a/src/shared/socket-util.h b/src/shared/socket-util.h
index 6bfb677fb5..9200ce8822 100644
--- a/src/shared/socket-util.h
+++ b/src/shared/socket-util.h
@@ -67,6 +67,7 @@ typedef enum SocketAddressBindIPv6Only {
 #define socket_address_family(a) ((a)->sockaddr.sa.sa_family)
 
 int socket_address_parse(SocketAddress *a, const char *s);
+int socket_address_parse_and_warn(SocketAddress *a, const char *s);
 int socket_address_parse_netlink(SocketAddress *a, const char *s);
 int socket_address_print(const SocketAddress *a, char **p);
 int socket_address_verify(const SocketAddress *a) _pure_;