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New `net.if.info` call to show LwIP information (#2862) 

* Remove app/include/netif/wlan_lwip_if.h

This file appears to be unused in our tree.

* New `net.if.info` call to show LwIP information

This is a generalization of `wifi.sta`'s and `wifi.ap`'s `getip` and
`getmac` calls.  I don't propose to deprecate those, but perhaps we
should, in the documentation, point users at this function instead.

The direct motivation is to permit continued use of DHCP-provided NTP
servers in a future where
https://github.com/nodemcu/nodemcu-firmware/pull/2819 has landed, now
that https://github.com/nodemcu/nodemcu-firmware/pull/2709 is in the
tree.  But rather than exposing just that information, a more general
interface seems useful.
This commit is contained in:
Nathaniel Wesley Filardo 2019-12-09 13:33:30 +01:00 committed by Marcel Stör
parent 4fc2b85fde
commit f85c2780ad
3 changed files with 98 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
app/include/netif/wlan_lwip_if.h
View File

@ -1,25 +0,0 @@
/*
* Copyright (c) 2010-2011 Espressif System
*
*/
#ifndef _WLAN_LWIP_IF_H_
#define _WLAN_LWIP_IF_H_
#define LWIP_IF0_PRIO 28
#define LWIP_IF1_PRIO 29
enum {
SIG_LWIP_RX = 0,
};
struct netif * eagle_lwip_if_alloc(struct ieee80211_conn *conn, const uint8 *macaddr, struct ip_info *info);
struct netif * eagle_lwip_getif(uint8 index);
#ifndef IOT_SIP_MODE
sint8 ieee80211_output_pbuf(struct netif *ifp, struct pbuf* pb);
#else
sint8 ieee80211_output_pbuf(struct ieee80211_conn *conn, esf_buf *eb);
#endif
#endif /* _WLAN_LWIP_IF_H_ */

61
app/modules/net.c
View File

@ -18,6 +18,7 @@
#include "lwip/igmp.h"
#include "lwip/tcp.h"
#include "lwip/udp.h"
#include "lwip/dhcp.h"
#if defined(CLIENT_SSL_ENABLE) && defined(LUA_USE_MODULES_NET) && defined(LUA_USE_MODULES_TLS)
#define TLS_MODULE_PRESENT
@ -980,6 +981,62 @@ static int net_getdnsserver( lua_State* L ) {
return 1;
}
#pragma mark - netif info
/*
* XXX This is internal to Espressif's SDK, but it's called from several places
* in the NodeMCU tree. It would be nicer if there were a LwIP export for this
* rather than this not-so-secret symbol.
*/
extern struct netif *eagle_lwip_getif(uint8);
static void
push_ipaddr(lua_State *L, ip_addr_t *addr) {
char temp[20];
ssize_t ipl = ets_snprintf(temp, sizeof temp, IPSTR, IP2STR(&addr->addr));
lua_assert (ipl >= 0 && ipl < 20);
lua_pushlstring( L, temp, ipl );
}
static void
field_from_ipaddr(lua_State *L, const char * field_name, ip_addr_t* addr) {
if ( ip_addr_isany(addr) ) {
lua_pushnil(L);
} else {
push_ipaddr(L, addr);
}
lua_setfield(L, -2, field_name);
}
static int net_if_info( lua_State* L ) {
int ifidx = luaL_optint(L, 1, 0);
struct netif * nif = eagle_lwip_getif(ifidx);
if (nif == NULL) {
return luaL_error( L, "unknown network interface index %d", ifidx);
}
lua_createtable(L, 0,
4 + (nif->dhcp == NULL ? 0 : 1));
lua_pushlstring(L, nif->hwaddr, nif->hwaddr_len);
lua_setfield(L, -2, "hwaddr");
field_from_ipaddr(L, "ip" , &nif->ip_addr);
field_from_ipaddr(L, "netmask", &nif->netmask);
field_from_ipaddr(L, "gateway", &nif->gw);
if (nif->dhcp != NULL) {
lua_createtable(L, 0, 3);
field_from_ipaddr(L, "server_ip" , &nif->dhcp->server_ip_addr );
field_from_ipaddr(L, "client_ip" , &nif->dhcp->offered_ip_addr );
field_from_ipaddr(L, "ntp_server", &nif->dhcp->offered_ntp_addr);
}
lua_setfield(L, -2, "dhcp");
return 1;
}
#pragma mark - Tables
#ifdef TLS_MODULE_PRESENT
@ -1031,6 +1088,9 @@ LROT_BEGIN(net_dns)
LROT_FUNCENTRY( resolve, net_dns_static )
LROT_END( net_dns, net_dns, 0 )
LROT_BEGIN(net_if)
LROT_FUNCENTRY( info, net_if_info )
LROT_END(net_if, net_if, 0)
LROT_BEGIN(net)
LROT_FUNCENTRY( createServer, net_createServer )
@ -1039,6 +1099,7 @@ LROT_BEGIN(net)
LROT_FUNCENTRY( multicastJoin, net_multicastJoin )
LROT_FUNCENTRY( multicastLeave, net_multicastLeave )
LROT_TABENTRY( dns, net_dns )
LROT_TABENTRY( if, net_if )
#ifdef TLS_MODULE_PRESENT
LROT_TABENTRY( cert, tls_cert )
#endif

37
docs/modules/net.md
View File

@ -618,6 +618,43 @@ Sets the IP of the DNS server used to resolve hostnames. Default: resolver1.open
#### See also
[`net.dns:getdnsserver()`](#netdnsgetdnsserver)
# net.if Module
## net.if.info()
Return information about a network interface, specified by index.
#### Syntax
`net.if.info(if_index)`
#### Parameters
- `if_index` the interface index; on ESP8266, `0` is the wifi client (STA) and `1`
is the wifi AP.
#### Returns
`nil` if the given `if_index` does not correspond to an interface. Otherwise,
a table containing ...
* `ip`, `netmask`, and `gateway` configured for this interface, as dotted quad strings
or `nil` if none is set.
* if DHCP was used to configure the interface, then `dhcp` will be a table containing...
* `server_ip` -- the DHCP server itself, as a dotted quad
* `client_ip` -- the IP address suggested for the client; likely, this equals `ip`
above, unless the configuration has been overridden.
* `ntp_server` -- the NTP server suggested by the DHCP server.
DNS servers are not tracked per-interface in LwIP and, as such, are not
reported here; use [`net.dns:getdnsserver()`](#netdnsgetdnsserver).
#### Example
`print(net.if.info(0).dhcp.ntp_server)` will show the NTP server suggested by
the DHCP server.
# net.cert Module
This part gone to the [TLS](tls.md) module, link kept for backward compatibility.