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netlink: make rtnl_resolve_link_alternative_name() optionally return the main interface name

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This commit is contained in:
Yu Watanabe 2021-06-10 18:17:47 +09:00
parent 57bd6aa701
commit afdf6c3b60
2 changed files with 16 additions and 7 deletions
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21
src/libsystemd/sd-netlink/netlink-util.c
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@ -267,13 +267,15 @@ int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifn
return 0;
}
int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name) {
int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name, char **ret) {
_cleanup_(sd_netlink_unrefp) sd_netlink *our_rtnl = NULL;
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL;
int r, ret;
int r, ifindex;
assert(name);
/* This returns ifindex and the main interface name. */
if (!ifname_valid_full(name, IFNAME_VALID_ALTERNATIVE))
return -EINVAL;
@ -299,11 +301,18 @@ int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name) {
if (r < 0)
return r;
r = sd_rtnl_message_link_get_ifindex(reply, &ret);
r = sd_rtnl_message_link_get_ifindex(reply, &ifindex);
if (r < 0)
return r;
assert(ret > 0);
return ret;
assert(ifindex > 0);
if (ret) {
r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, ret);
if (r < 0)
return r;
}
return ifindex;
}
int rtnl_resolve_ifname(sd_netlink **rtnl, const char *name) {
@ -317,7 +326,7 @@ int rtnl_resolve_ifname(sd_netlink **rtnl, const char *name) {
if (r > 0)
return r;
return rtnl_resolve_link_alternative_name(rtnl, name);
return rtnl_resolve_link_alternative_name(rtnl, name, NULL);
}
int rtnl_resolve_interface(sd_netlink **rtnl, const char *name) {

2
src/libsystemd/sd-netlink/netlink-util.h
View file

@ -91,7 +91,7 @@ int rtnl_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret)
int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names);
int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifname, char * const *alternative_names);
int rtnl_delete_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names);
int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name);
int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name, char **ret);
int rtnl_resolve_ifname(sd_netlink **rtnl, const char *name);
int rtnl_resolve_interface(sd_netlink **rtnl, const char *name);
int rtnl_resolve_interface_or_warn(sd_netlink **rtnl, const char *name);