tree-wide: clean up log_syntax() usage

- Rely everywhere that we use abs() on the error code passed in anyway,
  thus don't need to explicitly negate what we pass in

- Never attach synthetic error number information to log messages. Only
  log about errors we *receive* with the error number we got there,
  don't log any synthetic error, that don#t even propagate, but just eat
  up.

- Be more careful with attaching exactly the error we get, instead of
  errno or unrelated errors randomly.

- Fix one occasion where the error number and line number got swapped.

- Make sure we never tape over OOM issues, or inability to resolve
  specifiers

8 files changed, 49 insertions, 68 deletions

diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index b0d296941e..388beb5d4c 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -430,15 +430,13 @@ int config_parse_broadcast(
                 return r;
 
         if (n->family == AF_INET6) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Broadcast is invalid, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
@@ -487,10 +485,10 @@ int config_parse_address(const char *unit,
         e = strchr(rvalue, '/');
         if (e) {
                 unsigned i;
+
                 r = safe_atou(e + 1, &i);
                 if (r < 0) {
-                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                                   "Prefix length is invalid, ignoring assignment: %s", e + 1);
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is invalid, ignoring assignment: %s", e + 1);
                         return 0;
                 }
 
@@ -502,23 +500,20 @@ int config_parse_address(const char *unit,
 
         r = in_addr_from_string_auto(address, &f, &buffer);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Address is invalid, ignoring assignment: %s", address);
+                log_syntax(unit, LOG_ERR, filename, line, r, "Address is invalid, ignoring assignment: %s", address);
                 return 0;
         }
 
         if (!e && f == AF_INET) {
                 r = in_addr_default_prefixlen(&buffer.in, &n->prefixlen);
                 if (r < 0) {
-                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                                   "Prefix length not specified, and a default one can not be deduced for '%s', ignoring assignment", address);
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length not specified, and a default one can not be deduced for '%s', ignoring assignment", address);
                         return 0;
                 }
         }
 
         if (n->family != AF_UNSPEC && f != n->family) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Address is incompatible, ignoring assignment: %s", address);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", address);
                 return 0;
         }
 
@@ -567,9 +562,7 @@ int config_parse_label(const char *unit,
                 return log_oom();
 
         if (!ascii_is_valid(label) || strlen(label) >= IFNAMSIZ) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Interface label is not ASCII clean or is too"
-                           " long, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Interface label is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
                 free(label);
                 return 0;
         }
diff --git a/src/network/networkd-fdb.c b/src/network/networkd-fdb.c
index 22efadb843..9cb63cb79f 100644
--- a/src/network/networkd-fdb.c
+++ b/src/network/networkd-fdb.c
@@ -197,7 +197,7 @@ int config_parse_fdb_hwaddr(
                    &fdb_entry->mac_addr->ether_addr_octet[5]);
 
         if (ETHER_ADDR_LEN != r) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Not a valid MAC address, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
diff --git a/src/network/networkd-netdev-bond.c b/src/network/networkd-netdev-bond.c
index 12e2321674..bcaba57937 100644
--- a/src/network/networkd-netdev-bond.c
+++ b/src/network/networkd-netdev-bond.c
@@ -357,12 +357,12 @@ int config_parse_arp_ip_target_address(const char *unit,
 
                 r = in_addr_from_string_auto(n, &f, &buffer->ip);
                 if (r < 0) {
-                        log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Bond ARP ip target address is invalid, ignoring assignment: %s", n);
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Bond ARP ip target address is invalid, ignoring assignment: %s", n);
                         return 0;
                 }
 
                 if (f != AF_INET) {
-                        log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Bond ARP ip target address is invalid, ignoring assignment: %s", n);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Bond ARP ip target address is invalid, ignoring assignment: %s", n);
                         return 0;
                 }
 
@@ -373,7 +373,7 @@ int config_parse_arp_ip_target_address(const char *unit,
         }
 
         if (b->n_arp_ip_targets > NETDEV_BOND_ARP_TARGETS_MAX)
-                log_syntax(unit, LOG_WARNING, filename, line, EINVAL, "More than the maximum number of kernel-supported ARP ip targets specified: %d > %d", b->n_arp_ip_targets, NETDEV_BOND_ARP_TARGETS_MAX);
+                log_syntax(unit, LOG_WARNING, filename, line, 0, "More than the maximum number of kernel-supported ARP ip targets specified: %d > %d", b->n_arp_ip_targets, NETDEV_BOND_ARP_TARGETS_MAX);
 
         return 0;
 }
diff --git a/src/network/networkd-netdev-tunnel.c b/src/network/networkd-netdev-tunnel.c
index a906e473b6..c9b7fa96e2 100644
--- a/src/network/networkd-netdev-tunnel.c
+++ b/src/network/networkd-netdev-tunnel.c
@@ -395,12 +395,12 @@ int config_parse_tunnel_address(const char *unit,
 
         r = in_addr_from_string_auto(rvalue, &f, &buffer);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Tunnel address is invalid, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, r, "Tunnel address is invalid, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
         if (t->family != AF_UNSPEC && t->family != f) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Tunnel addresses incompatible, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Tunnel addresses incompatible, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
@@ -435,13 +435,14 @@ int config_parse_ipv6_flowlabel(const char* unit,
                 t->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
         } else {
                 r = config_parse_int(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &k, userdata);
-                if (r >= 0) {
-                        if (k > 0xFFFFF)
-                                log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse IPv6 flowlabel option, ignoring: %s", rvalue);
-                        else {
-                                *ipv6_flowlabel = htonl(k) & IP6_FLOWINFO_FLOWLABEL;
-                                t->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
-                        }
+                if (r < 0)
+                        return r;
+
+                if (k > 0xFFFFF)
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPv6 flowlabel option, ignoring: %s", rvalue);
+                else {
+                        *ipv6_flowlabel = htonl(k) & IP6_FLOWINFO_FLOWLABEL;
+                        t->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
                 }
         }
 
@@ -471,13 +472,12 @@ int config_parse_encap_limit(const char* unit,
         else {
                 r = safe_atoi(rvalue, &k);
                 if (r < 0) {
-                        log_syntax(unit, LOG_ERR, filename, line, r,
-                                   "Failed to parse Tunnel Encapsulation Limit option, ignoring: %s", rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Tunnel Encapsulation Limit option, ignoring: %s", rvalue);
                         return 0;
                 }
 
                 if (k > 255 || k < 0)
-                        log_syntax(unit, LOG_ERR, filename, line, k, "Invalid Tunnel Encapsulation value, ignoring: %d", k);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid Tunnel Encapsulation value, ignoring: %d", k);
                 else {
                         t->encap_limit = k;
                         t->flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
diff --git a/src/network/networkd-netdev-vxlan.c b/src/network/networkd-netdev-vxlan.c
index 2518e2732b..03a599c0d4 100644
--- a/src/network/networkd-netdev-vxlan.c
+++ b/src/network/networkd-netdev-vxlan.c
@@ -131,14 +131,12 @@ int config_parse_vxlan_group_address(const char *unit,
 
         r = in_addr_from_string_auto(rvalue, &f, &buffer);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "vxlan multicast group address is invalid, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, r, "vxlan multicast group address is invalid, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
-        if(v->family != AF_UNSPEC && v->family != f) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "vxlan multicast group incompatible, ignoring assignment: %s", rvalue);
+        if (v->family != AF_UNSPEC && v->family != f) {
+                log_syntax(unit, LOG_ERR, filename, line, 0, "vxlan multicast group incompatible, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index 57495b58e0..5d22598fc0 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -409,21 +409,18 @@ int config_parse_netdev(const char *unit,
 
         kind = netdev_kind_from_string(kind_string);
         if (kind == _NETDEV_KIND_INVALID) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Invalid NetDev kind: %s", lvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid NetDev kind: %s", lvalue);
                 return 0;
         }
 
         r = netdev_get(network->manager, rvalue, &netdev);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "%s could not be found, ignoring assignment: %s", lvalue, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, r, "%s could not be found, ignoring assignment: %s", lvalue, rvalue);
                 return 0;
         }
 
         if (netdev->kind != kind) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "NetDev is not a %s, ignoring assignment: %s", lvalue, rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "NetDev is not a %s, ignoring assignment: %s", lvalue, rvalue);
                 return 0;
         }
 
@@ -443,9 +440,7 @@ int config_parse_netdev(const char *unit,
         case NETDEV_KIND_VXLAN:
                 r = hashmap_put(network->stacked_netdevs, netdev->ifname, netdev);
                 if (r < 0) {
-                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                                   "Can not add VLAN '%s' to network: %m",
-                                   rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Can not add VLAN '%s' to network: %m", rvalue);
                         return 0;
                 }
 
@@ -484,7 +479,7 @@ int config_parse_domains(const char *unit,
 
         STRV_FOREACH(domain, *domains) {
                 if (is_localhost(*domain))
-                        log_syntax(unit, LOG_ERR, filename, line, EINVAL, "'localhost' domain names may not be configured, ignoring assignment: %s", *domain);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "'localhost' domain names may not be configured, ignoring assignment: %s", *domain);
                 else {
                         r = dns_name_is_valid(*domain);
                         if (r <= 0 && !streq(*domain, "*")) {
@@ -540,7 +535,7 @@ int config_parse_tunnel(const char *unit,
             netdev->kind != NETDEV_KIND_VTI6 &&
             netdev->kind != NETDEV_KIND_IP6TNL
             ) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                log_syntax(unit, LOG_ERR, filename, line, 0,
                            "NetDev is not a tunnel, ignoring assignment: %s", rvalue);
                 return 0;
         }
@@ -625,7 +620,7 @@ int config_parse_dhcp(
                 else if (streq(rvalue, "both"))
                         s = ADDRESS_FAMILY_YES;
                 else {
-                        log_syntax(unit, LOG_ERR, filename, line, s, "Failed to parse DHCP option, ignoring: %s", rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse DHCP option, ignoring: %s", rvalue);
                         return 0;
                 }
         }
@@ -670,13 +665,13 @@ int config_parse_ipv6token(
         }
 
         r = in_addr_is_null(AF_INET6, &buffer);
-        if (r < 0) {
+        if (r != 0) {
                 log_syntax(unit, LOG_ERR, filename, line, r, "IPv6 token can not be the ANY address, ignoring: %s", rvalue);
                 return 0;
         }
 
         if ((buffer.in6.s6_addr32[0] | buffer.in6.s6_addr32[1]) != 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "IPv6 token can not be longer than 64 bits, ignoring: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "IPv6 token can not be longer than 64 bits, ignoring: %s", rvalue);
                 return 0;
         }
 
@@ -730,7 +725,7 @@ int config_parse_ipv6_privacy_extensions(
                         if (streq(rvalue, "kernel"))
                                 s = _IPV6_PRIVACY_EXTENSIONS_INVALID;
                         else {
-                                log_syntax(unit, LOG_ERR, filename, line, s, "Failed to parse IPv6 privacy extensions option, ignoring: %s", rvalue);
+                                log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPv6 privacy extensions option, ignoring: %s", rvalue);
                                 return 0;
                         }
                 }
@@ -765,7 +760,7 @@ int config_parse_hostname(
                 return r;
 
         if (!hostname_is_valid(hn, false)) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Hostname is not valid, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Hostname is not valid, ignoring assignment: %s", rvalue);
                 free(hn);
                 return 0;
         }
@@ -799,7 +794,7 @@ int config_parse_timezone(
                 return r;
 
         if (!timezone_is_valid(tz)) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Timezone is not valid, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Timezone is not valid, ignoring assignment: %s", rvalue);
                 free(tz);
                 return 0;
         }
@@ -844,7 +839,7 @@ int config_parse_dhcp_server_dns(
                         return 0;
 
                 if (inet_pton(AF_INET, w, &a) <= 0) {
-                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse DNS server address, ignoring: %s", w);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse DNS server address, ignoring: %s", w);
                         continue;
                 }
 
@@ -883,7 +878,7 @@ int config_parse_dhcp_server_ntp(
 
                 r = extract_first_word(&p, &w, NULL, 0);
                 if (r < 0) {
-                        log_syntax(unit, LOG_ERR, filename, r, line, "Failed to extract word, ignoring: %s", rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract word, ignoring: %s", rvalue);
                         return 0;
                 }
 
@@ -891,7 +886,7 @@ int config_parse_dhcp_server_ntp(
                         return 0;
 
                 if (inet_pton(AF_INET, w, &a) <= 0) {
-                        log_syntax(unit, LOG_ERR, filename, r, line, "Failed to parse NTP server address, ignoring: %s", w);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse NTP server address, ignoring: %s", w);
                         continue;
                 }
 
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index fbaad40579..1f09d95674 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -294,8 +294,7 @@ int config_parse_gateway(const char *unit,
 
         r = in_addr_from_string_auto(rvalue, &f, &buffer);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Route is invalid, ignoring assignment: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, r, "Route is invalid, ignoring assignment: %s", rvalue);
                 return 0;
         }
 
@@ -345,14 +344,12 @@ int config_parse_destination(const char *unit,
 
         r = in_addr_from_string_auto(address, &f, &buffer);
         if (r < 0) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Destination is invalid, ignoring assignment: %s", address);
+                log_syntax(unit, LOG_ERR, filename, line, r, "Destination is invalid, ignoring assignment: %s", address);
                 return 0;
         }
 
         if (f != AF_INET && f != AF_INET6) {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Unknown address family, ignoring assignment: %s", address);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown address family, ignoring assignment: %s", address);
                 return 0;
         }
 
@@ -360,8 +357,7 @@ int config_parse_destination(const char *unit,
         if (e) {
                 r = safe_atou8(e + 1, &prefixlen);
                 if (r < 0) {
-                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                                   "Route destination prefix length is invalid, ignoring assignment: %s", e + 1);
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Route destination prefix length is invalid, ignoring assignment: %s", e + 1);
                         return 0;
                 }
         } else {
@@ -456,8 +452,7 @@ int config_parse_route_scope(const char *unit,
         else if (streq(rvalue, "global"))
                 n->scope = RT_SCOPE_UNIVERSE;
         else {
-                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
-                           "Unknown route scope: %s", rvalue);
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route scope: %s", rvalue);
                 return 0;
         }
 
diff --git a/src/network/networkd-util.c b/src/network/networkd-util.c
index a41cd86239..dde6b327ed 100644
--- a/src/network/networkd-util.c
+++ b/src/network/networkd-util.c
@@ -82,7 +82,7 @@ int config_parse_address_family_boolean_with_kernel(
                 if (streq(rvalue, "kernel"))
                         s = _ADDRESS_FAMILY_BOOLEAN_INVALID;
                 else {
-                        log_syntax(unit, LOG_ERR, filename, line, s, "Failed to parse IPForwarding= option, ignoring: %s", rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPForwarding= option, ignoring: %s", rvalue);
                         return 0;
                 }
         }
@@ -133,7 +133,7 @@ int config_parse_resolve(
 
                 s = resolve_support_from_string(rvalue);
                 if (s < 0){
-                        log_syntax(unit, LOG_ERR, filename, line, -s, "Failed to parse %s= option, ignoring: %s", lvalue, rvalue);
+                        log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse %s= option, ignoring: %s", lvalue, rvalue);
                         return 0;
                 }