espalexa robustness improvements
* prevent string buffer overflows (stack corruption) * avoid division by zero (program might crash) * avoid log(0) which is undefined, too * use faster math routines for float (logf, powf)
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Frank
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1c8f349a62
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a717238f76
@ -10,7 +10,7 @@
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*/
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/*
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* @title Espalexa library
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* @version 2.7.0
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* @version 2.7.1
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* @author Christian Schwinne
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* @license MIT
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* @contributors d-999
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@ -50,7 +50,7 @@
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#include "../network/Network.h"
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#ifdef ESPALEXA_DEBUG
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#pragma message "Espalexa 2.7.0 debug mode"
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#pragma message "Espalexa 2.7.1 debug mode"
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#define EA_DEBUG(x) Serial.print (x)
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#define EA_DEBUGLN(x) Serial.println (x)
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#else
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@ -142,7 +142,7 @@ private:
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}
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//device JSON string: color+temperature device emulates LCT015, dimmable device LWB010, (TODO: on/off Plug 01, color temperature device LWT010, color device LST001)
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void deviceJsonString(EspalexaDevice* dev, char* buf)
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void deviceJsonString(EspalexaDevice* dev, char* buf, size_t maxBuf) // softhack007 "size" parameter added, to avoid buffer overrun
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{
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char buf_lightid[27];
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encodeLightId(dev->getId() + 1, buf_lightid);
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@ -153,19 +153,19 @@ private:
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//TODO: %f is not working for some reason on ESP8266 in v0.11.0 (was fine in 0.10.2). Need to investigate
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//sprintf_P(buf_col,PSTR(",\"hue\":%u,\"sat\":%u,\"effect\":\"none\",\"xy\":[%f,%f]")
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// ,dev->getHue(), dev->getSat(), dev->getX(), dev->getY());
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sprintf_P(buf_col,PSTR(",\"hue\":%u,\"sat\":%u,\"effect\":\"none\",\"xy\":[%s,%s]"),dev->getHue(), dev->getSat(),
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snprintf_P(buf_col, sizeof(buf_col), PSTR(",\"hue\":%u,\"sat\":%u,\"effect\":\"none\",\"xy\":[%s,%s]"),dev->getHue(), dev->getSat(),
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((String)dev->getX()).c_str(), ((String)dev->getY()).c_str());
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char buf_ct[16] = "";
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//white spectrum support
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if (static_cast<uint8_t>(dev->getType()) > 1 && dev->getType() != EspalexaDeviceType::color)
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sprintf(buf_ct, ",\"ct\":%u", dev->getCt());
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snprintf(buf_ct, sizeof(buf_ct), ",\"ct\":%u", dev->getCt());
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char buf_cm[20] = "";
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if (static_cast<uint8_t>(dev->getType()) > 1)
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sprintf(buf_cm,PSTR("\",\"colormode\":\"%s"), modeString(dev->getColorMode()));
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snprintf(buf_cm, sizeof(buf_cm), PSTR("\",\"colormode\":\"%s"), modeString(dev->getColorMode()));
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sprintf_P(buf, PSTR("{\"state\":{\"on\":%s,\"bri\":%u%s%s,\"alert\":\"none%s\",\"mode\":\"homeautomation\",\"reachable\":true},"
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snprintf_P(buf, maxBuf, PSTR("{\"state\":{\"on\":%s,\"bri\":%u%s%s,\"alert\":\"none%s\",\"mode\":\"homeautomation\",\"reachable\":true},"
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"\"type\":\"%s\",\"name\":\"%s\",\"modelid\":\"%s\",\"manufacturername\":\"Philips\",\"productname\":\"E%u"
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"\",\"uniqueid\":\"%s\",\"swversion\":\"espalexa-2.7.0\"}")
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@ -219,10 +219,10 @@ private:
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EA_DEBUGLN("# Responding to description.xml ... #\n");
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IPAddress localIP = Network.localIP();
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char s[16];
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sprintf(s, "%d.%d.%d.%d", localIP[0], localIP[1], localIP[2], localIP[3]);
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snprintf(s, sizeof(s), "%d.%d.%d.%d", localIP[0], localIP[1], localIP[2], localIP[3]);
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char buf[1024];
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sprintf_P(buf,PSTR("<?xml version=\"1.0\" ?>"
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snprintf_P(buf, sizeof(buf), PSTR("<?xml version=\"1.0\" ?>"
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"<root xmlns=\"urn:schemas-upnp-org:device-1-0\">"
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"<specVersion><major>1</major><minor>0</minor></specVersion>"
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"<URLBase>http://%s:80/</URLBase>"
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@ -297,7 +297,7 @@ private:
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char buf[1024];
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sprintf_P(buf,PSTR("HTTP/1.1 200 OK\r\n"
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snprintf_P(buf, sizeof(buf), PSTR("HTTP/1.1 200 OK\r\n"
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"EXT:\r\n"
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"CACHE-CONTROL: max-age=100\r\n" // SSDP_INTERVAL
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"LOCATION: http://%s:80/description.xml\r\n"
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@ -493,7 +493,7 @@ public:
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unsigned idx = decodeLightKey(devId);
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EA_DEBUGLN(idx);
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char buf[50];
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sprintf_P(buf,PSTR("[{\"success\":{\"/lights/%u/state/\": true}}]"),devId);
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snprintf_P(buf,sizeof(buf),PSTR("[{\"success\":{\"/lights/%u/state/\": true}}]"),devId);
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server->send(200, "application/json", buf);
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if (idx >= currentDeviceCount) return true; //return if invalid ID
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EspalexaDevice* dev = devices[idx];
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@ -571,7 +571,7 @@ public:
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jsonTemp += ':';
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char buf[512];
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deviceJsonString(devices[i], buf);
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deviceJsonString(devices[i], buf, sizeof(buf)-1);
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jsonTemp += buf;
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if (i < currentDeviceCount-1) jsonTemp += ',';
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}
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@ -588,7 +588,7 @@ public:
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return true;
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}
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char buf[512];
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deviceJsonString(devices[idx], buf);
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deviceJsonString(devices[idx], buf, sizeof(buf)-1);
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server->send(200, "application/json", buf);
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}
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@ -2,6 +2,15 @@
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#include "EspalexaDevice.h"
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// debug macros
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#ifdef ESPALEXA_DEBUG
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#define EA_DEBUG(x) Serial.print (x)
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#define EA_DEBUGLN(x) Serial.println (x)
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#else
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#define EA_DEBUG(x)
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#define EA_DEBUGLN(x)
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#endif
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EspalexaDevice::EspalexaDevice(){}
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EspalexaDevice::EspalexaDevice(String deviceName, BrightnessCallbackFunction gnCallback, uint8_t initialValue) { //constructor for dimmable device
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@ -124,18 +133,21 @@ uint32_t EspalexaDevice::getRGB()
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{
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//TODO tweak a bit to match hue lamp characteristics
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//based on https://gist.github.com/paulkaplan/5184275
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float temp = 10000/ _ct; //kelvins = 1,000,000/mired (and that /100)
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float temp = (_ct != 0) ? (10000/ _ct) : 2; //kelvins = 1,000,000/mired (and that /100) softhack007: avoid division by zero - using "2" as substitute
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float r, g, b;
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#ifdef ESPALEXA_DEBUG
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if (_ct == 0) {EA_DEBUGLN(F("EspalexaDevice::getRGB() Warning: ct = 0!"));}
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#endif
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if (temp <= 66) {
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r = 255;
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g = temp;
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g = 99.470802 * log(g) - 161.119568;
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g = 99.470802 * logf(g) - 161.119568;
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if (temp <= 19) {
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b = 0;
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} else {
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b = temp-10;
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b = 138.517731 * log(b) - 305.044793;
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b = 138.517731 * logf(b) - 305.044793;
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}
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} else {
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r = temp - 60;
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@ -192,9 +204,9 @@ uint32_t EspalexaDevice::getRGB()
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b = 1.0f;
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}
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// Apply gamma correction
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r = r <= 0.0031308f ? 12.92f * r : (1.0f + 0.055f) * pow(r, (1.0f / 2.4f)) - 0.055f;
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g = g <= 0.0031308f ? 12.92f * g : (1.0f + 0.055f) * pow(g, (1.0f / 2.4f)) - 0.055f;
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b = b <= 0.0031308f ? 12.92f * b : (1.0f + 0.055f) * pow(b, (1.0f / 2.4f)) - 0.055f;
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r = r <= 0.0031308f ? 12.92f * r : (1.0f + 0.055f) * powf(r, (1.0f / 2.4f)) - 0.055f;
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g = g <= 0.0031308f ? 12.92f * g : (1.0f + 0.055f) * powf(g, (1.0f / 2.4f)) - 0.055f;
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b = b <= 0.0031308f ? 12.92f * b : (1.0f + 0.055f) * powf(b, (1.0f / 2.4f)) - 0.055f;
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if (r > b && r > g) {
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// red is biggest
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@ -328,8 +340,10 @@ void EspalexaDevice::setColor(uint8_t r, uint8_t g, uint8_t b)
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float X = r * 0.664511f + g * 0.154324f + b * 0.162028f;
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float Y = r * 0.283881f + g * 0.668433f + b * 0.047685f;
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float Z = r * 0.000088f + g * 0.072310f + b * 0.986039f;
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if ((r+g+b) > 0) { // softhack007: avoid division by zero
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_x = X / (X + Y + Z);
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_y = Y / (X + Y + Z);
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} else { _x = _y = 0.5f;} // softhack007: use default values in case of "black"
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_rgb = ((r << 16) | (g << 8) | b);
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_mode = EspalexaColorMode::xy;
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}
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