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libnetlink: dump extack string in done message 

Print any extack message that has been appended to a NLMSG_DONE message.
To avoid duplication, move the existing print code to a new helper.

Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
David Ahern 2018-10-04 14:07:15 -07:00
parent fdce94d0d1
commit 2750252d7e
1 changed files with 39 additions and 5 deletions
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44
lib/libnetlink.c
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@ -67,6 +67,14 @@ static int err_attr_cb(const struct nlattr *attr, void *data)
return MNL_CB_OK;
}
static void print_ext_ack_msg(bool is_err, const char *msg)
{
fprintf(stderr, "%s: %s", is_err ? "Error" : "Warning", msg);
if (msg[strlen(msg) - 1] != '.')
fprintf(stderr, ".");
fprintf(stderr, "\n");
}
/* dump netlink extended ack error message */
int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
{
@ -108,12 +116,29 @@ int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
if (msg && *msg != '\0') {
bool is_err = !!err->error;
fprintf(stderr, "%s: %s",
is_err ? "Error" : "Warning", msg);
if (msg[strlen(msg) - 1] != '.')
fprintf(stderr, ".");
fprintf(stderr, "\n");
print_ext_ack_msg(is_err, msg);
return is_err ? 1 : 0;
}
return 0;
}
static int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error)
{
struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {};
unsigned int hlen = sizeof(int);
const char *msg = NULL;
if (mnl_attr_parse(nlh, hlen, err_attr_cb, tb) != MNL_CB_OK)
return 0;
if (tb[NLMSGERR_ATTR_MSG])
msg = mnl_attr_get_str(tb[NLMSGERR_ATTR_MSG]);
if (msg && *msg != '\0') {
bool is_err = !!error;
print_ext_ack_msg(is_err, msg);
return is_err ? 1 : 0;
}
@ -127,6 +152,11 @@ int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
{
return 0;
}
static int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error)
{
return 0;
}
#endif
void rtnl_close(struct rtnl_handle *rth)
@ -512,6 +542,10 @@ static int rtnl_dump_done(struct nlmsghdr *h)
}
if (len < 0) {
/* check for any messages returned from kernel */
if (nl_dump_ext_ack_done(h, len))
return len;
errno = -len;
switch (errno) {
case ENOENT: