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net_info module - ping function (#2854)
* Net_info module exposing ping function initial commit * Ping as a part of net module * Sent callback implemented * Add NET_PING_ENABLE macro Authored-by: vsky <blue205@centrum.cz> with support from TerryE
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| // *************************************************************************** | ||
| // net_ping functionnality for ESP8266 with nodeMCU | ||
| // | ||
| // Written by Lukas Voborsky (@voborsky) with great help by TerryE | ||
| // *************************************************************************** | ||
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| // #define NODE_DEBUG | ||
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| #include "net_ping.h" | ||
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| #include "module.h" | ||
| #include "lauxlib.h" | ||
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| #include "lwip/ip_addr.h" | ||
| #include "espconn.h" | ||
| #include "lwip/dns.h" | ||
| #include "lwip/app/ping.h" | ||
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| /* | ||
| ping_opt needs to be the first element of the structure. It is a workaround to pass the | ||
| callback reference and self_ref to the ping_received function. Pointer the ping_option | ||
| structure is equal to the pointer to net_ping_t structure. | ||
| */ | ||
| typedef struct { | ||
| struct ping_option ping_opt; | ||
| uint32_t ping_callback_ref; | ||
| } net_ping_t; | ||
| typedef net_ping_t* ping_t; | ||
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| /* | ||
| * ping_received_sent(pingresp) | ||
| */ | ||
| #define LuaCBreceivedfunc lua_upvalueindex(1) | ||
| #define LuaCBsentfunc lua_upvalueindex(2) | ||
| #define nipUD lua_upvalueindex(3) | ||
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| static int ping_received_sent(lua_State *L) { | ||
| struct ping_resp *resp = (struct ping_resp *) lua_touserdata (L, 1); | ||
| ping_t nip = (ping_t) lua_touserdata (L, nipUD); | ||
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| NODE_DBG("[net_info ping_received_sent] nip = %p\n", nip); | ||
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| if (resp == NULL) { /* resolution failed so call the CB with 0 byte count to flag this */ | ||
| luaL_unref(L, LUA_REGISTRYINDEX, nip->ping_callback_ref); | ||
| lua_pushvalue(L, LuaCBreceivedfunc); | ||
| lua_pushinteger(L, 0); | ||
| luaL_pcallx(L, 1, 0); | ||
| return 0; | ||
| } | ||
| char ipaddrstr[16]; | ||
| ipaddr_ntoa_r((ip_addr_t *) &nip->ping_opt.ip, ipaddrstr, sizeof(ipaddrstr)); | ||
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| if (resp->total_count == 0) { /* processing receive response */ | ||
| NODE_DBG("[ping_received] %s: resp_time=%d seqno=%d bytes=%d ping_err=%d\n", | ||
| ipaddrstr, resp->resp_time, resp->seqno, resp->bytes, resp->ping_err); | ||
| lua_pushvalue(L, LuaCBreceivedfunc); | ||
| lua_pushinteger(L, resp->bytes); | ||
| lua_pushstring(L, ipaddrstr); | ||
| lua_pushinteger(L, resp->seqno); | ||
| lua_pushinteger(L, resp->ping_err == 0 ? resp->resp_time: -1); | ||
| luaL_pcallx(L, 4, 0); | ||
| } else { /* processing sent response */ | ||
| NODE_DBG("[ping_sent] %s: total_count=%d timeout_count=%d " | ||
| "total_bytes=%d total_time=%d\n", | ||
| ipaddrstr, resp->total_count, resp->timeout_count, | ||
| resp->total_bytes, resp->total_time); | ||
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| lua_pushvalue(L, LuaCBsentfunc); | ||
| if lua_isfunction(L, -1) { | ||
| lua_pushstring(L, ipaddrstr); | ||
| lua_pushinteger(L, resp->total_count); | ||
| lua_pushinteger(L, resp->timeout_count); | ||
| lua_pushinteger(L, resp->total_bytes); | ||
| lua_pushinteger(L, resp->total_time); | ||
| luaL_pcallx(L, 5, 0); | ||
| } | ||
| luaL_unref(L, LUA_REGISTRYINDEX, nip->ping_callback_ref); /* unregister the closure */ | ||
| } | ||
| return 0; | ||
| } | ||
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| /* | ||
| * Wrapper to call ping_received_sent(pingresp) | ||
| */ | ||
| static void ping_CB(net_ping_t *nip, struct ping_resp *pingresp) { | ||
| NODE_DBG("[net_info ping_CB] nip = %p, nip->ping_callback_ref = %p, pingresp= %p\n", nip, nip->ping_callback_ref, pingresp); | ||
| lua_State *L = lua_getstate(); | ||
| lua_rawgeti(L, LUA_REGISTRYINDEX, nip->ping_callback_ref); | ||
| lua_pushlightuserdata(L, pingresp); | ||
| lua_call(L, 1, 0); // call the closure (ping_received_sent) | ||
| } | ||
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| /* | ||
| * Wrapper to call ping_start using fully resolve IP4 address | ||
| */ | ||
| static void net_ping_raw(const char *name, ip_addr_t *ipaddr, ping_t nip) { | ||
| NODE_DBG("[net_ping_raw] name = %s, ipaddr= %x\n", name, ipaddr); | ||
| if (ipaddr) { | ||
| char ipaddrstr[16]; | ||
| ipaddr_ntoa_r(ipaddr, ipaddrstr, sizeof(ipaddrstr)); | ||
| NODE_DBG("[net_ping_raw] ip: %s\n", ipaddrstr); | ||
| } | ||
| lua_State *L = lua_getstate(); | ||
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| if (!ipaddr || ipaddr->addr == 0xFFFFFFFF) { | ||
| ping_CB(nip, NULL); /* A NULL pinresp flags DNS resolution failure */ | ||
| return; | ||
| } | ||
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| nip->ping_opt.ip = ipaddr->addr; | ||
| NODE_DBG("[net_ping_raw] calling ping_start\n"); | ||
| if (!ping_start(&(nip->ping_opt))) { | ||
| luaL_unref(L, LUA_REGISTRYINDEX, nip->ping_callback_ref); | ||
| luaL_error(L, "memory allocation error: cannot start ping"); | ||
| } | ||
| } | ||
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| // Lua: net.ping(domain, [count], callback) | ||
| int net_ping(lua_State *L) | ||
| { | ||
| ip_addr_t addr; | ||
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| // retrieve function parameters | ||
| const char *ping_target = luaL_checkstring(L, 1); | ||
| bool isf2 = lua_isfunction(L, 2); | ||
| lua_Integer l_count = isf2 ? 0: luaL_optinteger(L, 2, 0); /* use ping_start() default */ | ||
| lua_settop(L, isf2 ? 3 : 4); | ||
| luaL_argcheck(L, lua_isfunction(L, -2), -2, "no received callback specified"); | ||
| luaL_argcheck(L, lua_isfunction(L, -1) || lua_isnil(L, -1), -1, "invalid sent callback, function expected"); | ||
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| ping_t nip = (ping_t) memset(lua_newuserdata(L, sizeof(*nip)), 0, sizeof(*nip)); | ||
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| /* Register C closure with 3 Upvals: (1) Lua CB receive function; (2) Lua CB sent function; (3) nip Userdata */ | ||
| lua_pushcclosure(L, ping_received_sent, 3); // stack has 2 callbacks and nip UD; [-3, +1, m] | ||
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| nip->ping_callback_ref = luaL_ref(L, LUA_REGISTRYINDEX); // registers the closure to registry [-1, +0, m] | ||
| nip->ping_opt.count = l_count; | ||
| nip->ping_opt.coarse_time = 0; | ||
| nip->ping_opt.recv_function = (ping_recv_function) &ping_CB; | ||
| nip->ping_opt.sent_function = (ping_sent_function) &ping_CB; | ||
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| NODE_DBG("[net_ping] nip = %p, nip->ping_callback_ref = %p\n", nip, nip->ping_callback_ref); | ||
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| err_t err = dns_gethostbyname(ping_target, &addr, (dns_found_callback) net_ping_raw, nip); | ||
| if (err != ERR_OK && err != ERR_INPROGRESS) { | ||
| luaL_unref(L, LUA_REGISTRYINDEX, nip->ping_callback_ref); | ||
| return luaL_error(L, "lwip error %d", err); | ||
| } | ||
| if (err == ERR_OK) { | ||
| NODE_DBG("[net_ping] No DNS resolution needed\n"); | ||
| net_ping_raw(ping_target, &addr, nip); | ||
| } | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| #ifdef NET_PING_ENABLE | ||
| int net_ping(lua_State *L); | ||
| #endif |
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