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wg: warn once on unrecognized items

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DaveM suggests we do in fact do this. Others on the same thread weren't
happy about the length of the proposed message, so we also give a bit of
a less dramatic warning.

This reverts commit a2cc976a3b572cf308cc2d97c080eacac60416fe.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2017-10-09 13:27:00 +02:00
parent 8774fccff3
commit e13b1e719b
2 changed files with 22 additions and 0 deletions
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1
src/containers.h
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@ -63,6 +63,7 @@ enum {
struct wgdevice {
char name[IFNAMSIZ];
uint32_t ifindex;
uint32_t flags;

21
src/ipc.c
View file

@ -91,6 +91,15 @@ static int add_next_to_inflatable_buffer(struct inflatable_buffer *buffer)
return 0;
}
static void warn_unrecognized(const char *which)
{
static bool once = false;
if (once)
return;
once = true;
fprintf(stderr, "Warning: one or more unrecognized %s attributes", which);
}
static FILE *userspace_interface_file(const char *interface)
{
struct stat sbuf;
@ -421,6 +430,8 @@ static int userspace_get_device(struct wgdevice **out, const char *interface)
peer->tx_bytes = NUM(0xffffffffffffffffULL);
else if (!strcmp(key, "errno"))
ret = -NUM(0x7fffffffU);
else
warn_unrecognized("daemon");
}
ret = -EPROTO;
err:
@ -692,6 +703,8 @@ static int parse_allowedip(const struct nlattr *attr, void *data)
if (!mnl_attr_validate(attr, MNL_TYPE_U8))
ctx->allowedip->cidr = mnl_attr_get_u8(attr);
break;
default:
warn_unrecognized("netlink");
}
return MNL_CB_OK;
@ -761,6 +774,8 @@ static int parse_peer(const struct nlattr *attr, void *data)
break;
case WGPEER_A_ALLOWEDIPS:
return mnl_attr_parse_nested(attr, parse_allowedips, ctx);
default:
warn_unrecognized("netlink");
}
return MNL_CB_OK;
@ -794,6 +809,10 @@ static int parse_device(const struct nlattr *attr, void *data)
struct get_device_ctx *ctx = data;
switch (mnl_attr_get_type(attr)) {
case WGDEVICE_A_IFINDEX:
if (!mnl_attr_validate(attr, MNL_TYPE_U32))
ctx->device->ifindex = mnl_attr_get_u32(attr);
break;
case WGDEVICE_A_IFNAME:
if (!mnl_attr_validate(attr, MNL_TYPE_STRING))
strncpy(ctx->device->name, mnl_attr_get_str(attr), sizeof(ctx->device->name) - 1);
@ -816,6 +835,8 @@ static int parse_device(const struct nlattr *attr, void *data)
break;
case WGDEVICE_A_PEERS:
return mnl_attr_parse_nested(attr, parse_peers, ctx);
default:
warn_unrecognized("netlink");
}
return MNL_CB_OK;