ESP8266 part of the f105-motor-demo project (see f105-motor-demo_stm32)
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/*
Esp8266 http server - core routines
*/
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* Jeroen Domburg <jeroen@spritesmods.com> wrote this file. As long as you retain
* this notice you can do whatever you want with this stuff. If we meet some day,
* and you think this stuff is worth it, you can buy me a beer in return.
* ----------------------------------------------------------------------------
*/
#include <esp8266.h>
#include "httpd.h"
#include "httpd-platform.h"
//Max length of request head. This is statically allocated for each connection.
#define MAX_HEAD_LEN 1024
//Max post buffer len. This is dynamically malloc'ed if needed.
#define MAX_POST 1024
//Max send buffer len. This is allocated on the stack.
#define MAX_SENDBUFF_LEN 2048
//If some data can't be sent because the underlaying socket doesn't accept the data (like the nonos
//layer is prone to do), we put it in a backlog that is dynamically malloc'ed. This defines the max
//size of the backlog.
#define MAX_BACKLOG_SIZE (4*1024)
#define MAX_CORS_TOKEN_LEN 256
//This gets set at init time.
static HttpdBuiltInUrl *builtInUrls;
typedef struct HttpSendBacklogItem HttpSendBacklogItem;
struct HttpSendBacklogItem {
int len;
HttpSendBacklogItem *next;
char data[];
};
//Flags
#define HFL_HTTP11 (1<<0)
#define HFL_CHUNKED (1<<1)
#define HFL_SENDINGBODY (1<<2)
#define HFL_DISCONAFTERSENT (1<<3)
//Private data for http connection
struct HttpdPriv {
char head[MAX_HEAD_LEN];
char corsToken[MAX_CORS_TOKEN_LEN];
int headPos;
char *sendBuff;
int sendBuffLen;
char *chunkHdr;
HttpSendBacklogItem *sendBacklog;
int sendBacklogSize;
int flags;
};
//Connection pool
static HttpdConnData *connData[HTTPD_MAX_CONNECTIONS];
//Struct to keep extension->mime data in
typedef struct {
const char *ext;
const char *mimetype;
} MimeMap;
//#define RSTR(a) ((const char)(a))
//The mappings from file extensions to mime types. If you need an extra mime type,
//add it here.
static const ICACHE_RODATA_ATTR MimeMap mimeTypes[]={
// html
{"html", "text/html"},
{"css", "text/css"},
{"json", "application/json"},
{"js", "text/javascript"},
{"txt", "text/plain"},
{"csv", "text/csv"},
// images
{"ico", "image/x-icon"},
{"jpg", "image/jpeg"},
{"png", "image/png"},
{"svg", "image/svg+xml"},
{NULL, "text/html"}, //default value
};
//Returns a static char* to a mime type for a given url to a file.
const char ICACHE_FLASH_ATTR *httpdGetMimetype(const char *filepath) {
int i=0;
//Go find the extension (searching from the end)
const char *ext=filepath+(strlen(filepath)-1);
while (ext!=filepath && *ext!='.') ext--;
if (*ext=='.') ext++;
//ToDo: strcmp is case sensitive; we may want to do case-intensive matching here...
while (mimeTypes[i].ext!=NULL && strcmp(ext, mimeTypes[i].ext)!=0) i++;
if (mimeTypes[i].ext == NULL) {
// we didn't find any proper match
if (strncmp(filepath, "/json/", 6) == 0) {
// if it's in the json folder, it surely is json!
return "application/json";
}
}
return mimeTypes[i].mimetype;
}
//Looks up the connData info for a specific connection
static HttpdConnData ICACHE_FLASH_ATTR *httpdFindConnData(ConnTypePtr conn, const char *remIp, int remPort) {
for (int i=0; i<HTTPD_MAX_CONNECTIONS; i++) {
if (connData[i] && connData[i]->remote_port == remPort &&
memcmp(connData[i]->remote_ip, remIp, 4) == 0) {
connData[i]->conn=conn;
return connData[i];
}
}
//Shouldn't happen.
error("*** Unknown connection %d.%d.%d.%d:%d", remIp[0]&0xff, remIp[1]&0xff, remIp[2]&0xff, remIp[3]&0xff, remPort);
httpdPlatDisconnect(conn);
return NULL;
}
//Retires a connection for re-use
static void ICACHE_FLASH_ATTR httpdRetireConn(HttpdConnData *conn) {
if (conn->priv->sendBacklog!=NULL) {
HttpSendBacklogItem *i, *j;
i=conn->priv->sendBacklog;
do {
j=i;
i=i->next;
free(j);
} while (i!=NULL);
}
if (conn->post->buff!=NULL) free(conn->post->buff);
if (conn->post!=NULL) free(conn->post);
if (conn->priv!=NULL) free(conn->priv);
if (conn) free(conn);
for (int i=0; i<HTTPD_MAX_CONNECTIONS; i++) {
if (connData[i]==conn) connData[i]=NULL;
}
}
//Stupid li'l helper function that returns the value of a hex char.
static int ICACHE_FLASH_ATTR httpdHexVal(char c) {
if (c>='0' && c<='9') return c-'0';
if (c>='A' && c<='F') return c-'A'+10;
if (c>='a' && c<='f') return c-'a'+10;
return 0;
}
//Decode a percent-encoded value.
//Takes the valLen bytes stored in val, and converts it into at most retLen bytes that
//are stored in the ret buffer. Returns the actual amount of bytes used in ret. Also
//zero-terminates the ret buffer.
int ICACHE_FLASH_ATTR httpdUrlDecode(char *val, int valLen, char *ret, int retLen) {
int s=0, d=0;
int esced=0, escVal=0;
while (s<valLen && d<retLen) {
if (esced==1) {
escVal=httpdHexVal(val[s])<<4;
esced=2;
} else if (esced==2) {
escVal+=httpdHexVal(val[s]);
ret[d++]=(char)escVal;
esced=0;
} else if (val[s]=='%') {
esced=1;
} else if (val[s]=='+') {
ret[d++]=' ';
} else {
ret[d++]=val[s];
}
s++;
}
if (d<retLen) ret[d]=0;
return d;
}
//Find a specific arg in a string of get- or post-data.
//Line is the string of post/get-data, arg is the name of the value to find. The
//zero-terminated result is written in buff, with at most buffLen bytes used. The
//function returns the length of the result, or -1 if the value wasn't found. The
//returned string will be urldecoded already.
int ICACHE_FLASH_ATTR httpdFindArg(char *line, char *arg, char *buff, int buffLen) {
char *p, *e;
if (line==NULL) return -1;
p=line;
while(p!=NULL && *p!='\n' && *p!='\r' && *p!=0) {
// httpd_printf("findArg: %s\n", p);
if (strncmp(p, arg, strlen(arg))==0 && p[strlen(arg)]=='=') {
p+=strlen(arg)+1; //move p to start of value
e=(char*)strstr(p, "&");
if (e==NULL) e=p+strlen(p);
// httpd_printf("findArg: val %s len %d\n", p, (e-p));
return httpdUrlDecode(p, (e-p), buff, buffLen);
}
p=(char*)strstr(p, "&");
if (p!=NULL) p+=1;
}
warn("Finding %s in %s: Not found :/", arg, line);
return -1; //not found
}
//Get the value of a certain header in the HTTP client head
//Returns true when found, false when not found.
int ICACHE_FLASH_ATTR httpdGetHeader(HttpdConnData *conn, char *header, char *ret, int retLen) {
char *p=conn->priv->head;
p=p+strlen(p)+1; //skip GET/POST part
p=p+strlen(p)+1; //skip HTTP part
while (p<(conn->priv->head+conn->priv->headPos)) {
while(*p<=32 && *p!=0) p++; //skip crap at start
//See if this is the header
if (strncmp(p, header, strlen(header))==0 && p[strlen(header)]==':') {
//Skip 'key:' bit of header line
p=p+strlen(header)+1;
//Skip past spaces after the colon
while(*p==' ') p++;
//Copy from p to end
while (*p!=0 && *p!='\r' && *p!='\n' && retLen>1) {
*ret++=*p++;
retLen--;
}
//Zero-terminate string
*ret=0;
//All done :)
return 1;
}
p+=strlen(p)+1; //Skip past end of string and \0 terminator
}
return 0;
}
//Call before calling httpdStartResponse to disable automatically-chosen transfer
//encodings (specifically, for now, chunking) and fall back on Connection: Close.
void ICACHE_FLASH_ATTR httpdDisableTransferEncoding(HttpdConnData *conn) {
conn->priv->flags&=~HFL_CHUNKED;
}
//Start the response headers.
void ICACHE_FLASH_ATTR httpdStartResponse(HttpdConnData *conn, int code) {
char buff[256];
int l;
l=sprintf(buff, "HTTP/1.%d %d OK\r\nServer: esp8266-httpd/"HTTPDVER"\r\n%s\r\n",
(conn->priv->flags&HFL_HTTP11)?1:0,
code,
(conn->priv->flags&HFL_CHUNKED)?"Transfer-Encoding: chunked":"Connection: close");
httpdSend(conn, buff, l);
// CORS headers
httpdSend(conn, "Access-Control-Allow-Origin: *\r\n", -1);
httpdSend(conn, "Access-Control-Allow-Methods: GET,POST,OPTIONS\r\n", -1);
}
//Send a http header.
void ICACHE_FLASH_ATTR httpdHeader(HttpdConnData *conn, const char *field, const char *val) {
httpdSend(conn, field, -1);
httpdSend(conn, ": ", -1);
httpdSend(conn, val, -1);
httpdSend(conn, "\r\n", -1);
}
//Finish the headers.
void ICACHE_FLASH_ATTR httpdEndHeaders(HttpdConnData *conn) {
httpdSend(conn, "\r\n", -1);
conn->priv->flags|=HFL_SENDINGBODY;
}
//Redirect to the given URL.
void ICACHE_FLASH_ATTR httpdRedirect(HttpdConnData *conn, char *newUrl) {
httpdStartResponse(conn, 302);
httpdHeader(conn, "Location", newUrl);
httpdEndHeaders(conn);
httpdSend(conn, "Moved to ", -1);
httpdSend(conn, newUrl, -1);
}
//Use this as a cgi function to redirect one url to another.
int ICACHE_FLASH_ATTR cgiRedirect(HttpdConnData *connData) {
if (connData->conn==NULL) {
//Connection aborted. Clean up.
return HTTPD_CGI_DONE;
}
httpdRedirect(connData, (char*)connData->cgiArg);
return HTTPD_CGI_DONE;
}
//Used to spit out a 404 error
static int ICACHE_FLASH_ATTR cgiNotFound(HttpdConnData *connData) {
if (connData->conn==NULL) return HTTPD_CGI_DONE;
httpdStartResponse(connData, 404);
httpdEndHeaders(connData);
httpdSend(connData, "404 File not found.", -1);
return HTTPD_CGI_DONE;
}
//This CGI function redirects to a fixed url of http://[hostname]/ if hostname field of request isn't
//already that hostname. Use this in combination with a DNS server that redirects everything to the
//ESP in order to load a HTML page as soon as a phone, tablet etc connects to the ESP. Watch out:
//this will also redirect connections when the ESP is in STA mode, potentially to a hostname that is not
//in the 'official' DNS and so will fail.
int ICACHE_FLASH_ATTR cgiRedirectToHostname(HttpdConnData *connData) {
static const char hostFmt[]="http://%s/";
char *buff;
int isIP=0;
int x;
if (connData->conn==NULL) {
//Connection aborted. Clean up.
return HTTPD_CGI_DONE;
}
if (connData->hostName==NULL) {
warn("Huh? No hostname.\n");
return HTTPD_CGI_NOTFOUND;
}
//Quick and dirty code to see if host is an IP
if (strlen(connData->hostName)>8) {
isIP=1;
for (x=0; x<strlen(connData->hostName); x++) {
if (connData->hostName[x]!='.' && (connData->hostName[x]<'0' || connData->hostName[x]>'9')) isIP=0;
}
}
if (isIP) return HTTPD_CGI_NOTFOUND;
//Check hostname; pass on if the same
if (strcmp(connData->hostName, (char*)connData->cgiArg)==0) return HTTPD_CGI_NOTFOUND;
//Not the same. Redirect to real hostname.
buff=malloc(strlen((char*)connData->cgiArg)+sizeof(hostFmt));
sprintf(buff, hostFmt, (char*)connData->cgiArg);
dbg("Redirecting to hostname url %s", buff);
httpdRedirect(connData, buff);
free(buff);
return HTTPD_CGI_DONE;
}
//Same as above, but will only redirect clients with an IP that is in the range of
//the SoftAP interface. This should preclude clients connected to the STA interface
//to be redirected to nowhere.
int ICACHE_FLASH_ATTR cgiRedirectApClientToHostname(HttpdConnData *connData) {
#ifndef FREERTOS
uint32 *remadr;
struct ip_info apip;
int x=wifi_get_opmode();
//Check if we have an softap interface; bail out if not
if (x!=2 && x!=3) return HTTPD_CGI_NOTFOUND;
remadr=(uint32 *)connData->remote_ip;
wifi_get_ip_info(SOFTAP_IF, &apip);
if ((*remadr & apip.netmask.addr) == (apip.ip.addr & apip.netmask.addr)) {
return cgiRedirectToHostname(connData);
} else {
return HTTPD_CGI_NOTFOUND;
}
#else
return HTTPD_CGI_NOTFOUND;
#endif
}
//Add data to the send buffer. len is the length of the data. If len is -1
//the data is seen as a C-string.
//Returns 1 for success, 0 for out-of-memory.
int ICACHE_FLASH_ATTR httpdSend(HttpdConnData *conn, const char *data, int len) {
if (conn->conn==NULL) return 0;
if (len<0) len=strlen(data);
if (len==0) return 0;
if (conn->priv->flags&HFL_CHUNKED && conn->priv->flags&HFL_SENDINGBODY && conn->priv->chunkHdr==NULL) {
if (conn->priv->sendBuffLen+len+6>MAX_SENDBUFF_LEN) return 0;
//Establish start of chunk
conn->priv->chunkHdr=&conn->priv->sendBuff[conn->priv->sendBuffLen];
strcpy(conn->priv->chunkHdr, "0000\r\n");
conn->priv->sendBuffLen+=6;
}
if (conn->priv->sendBuffLen+len>MAX_SENDBUFF_LEN) return 0;
memcpy(conn->priv->sendBuff+conn->priv->sendBuffLen, data, len);
conn->priv->sendBuffLen+=len;
return 1;
}
static char ICACHE_FLASH_ATTR httpdHexNibble(int val) {
val&=0xf;
if (val<10) return '0'+val;
return 'A'+(val-10);
}
//Function to send any data in conn->priv->sendBuff. Do not use in CGIs unless you know what you
//are doing! Also, if you do set conn->cgi to NULL to indicate the connection is closed, do it BEFORE
//calling this.
void ICACHE_FLASH_ATTR httpdFlushSendBuffer(HttpdConnData *conn) {
int r, len;
if (conn->conn==NULL) return;
if (conn->priv->chunkHdr!=NULL) {
//We're sending chunked data, and the chunk needs fixing up.
//Finish chunk with cr/lf
httpdSend(conn, "\r\n", 2);
//Calculate length of chunk
len=((&conn->priv->sendBuff[conn->priv->sendBuffLen])-conn->priv->chunkHdr)-8;
//Fix up chunk header to correct value
conn->priv->chunkHdr[0]=httpdHexNibble(len>>12);
conn->priv->chunkHdr[1]=httpdHexNibble(len>>8);
conn->priv->chunkHdr[2]=httpdHexNibble(len>>4);
conn->priv->chunkHdr[3]=httpdHexNibble(len>>0);
//Reset chunk hdr for next call
conn->priv->chunkHdr=NULL;
}
if (conn->priv->flags&HFL_CHUNKED && conn->priv->flags&HFL_SENDINGBODY && conn->cgi==NULL) {
//Connection finished sending whatever needs to be sent. Add NULL chunk to indicate this.
strcpy(&conn->priv->sendBuff[conn->priv->sendBuffLen], "0\r\n\r\n");
conn->priv->sendBuffLen+=5;
}
if (conn->priv->sendBuffLen!=0) {
r=httpdPlatSendData(conn->conn, conn->priv->sendBuff, conn->priv->sendBuffLen);
if (!r) {
//Can't send this for some reason. Dump packet in backlog, we can send it later.
if (conn->priv->sendBacklogSize+conn->priv->sendBuffLen>MAX_BACKLOG_SIZE) {
error("Httpd: Backlog: Exceeded max backlog size, dropped %d bytes instead of sending them.", conn->priv->sendBuffLen);
conn->priv->sendBuffLen=0;
return;
}
HttpSendBacklogItem *i=malloc(sizeof(HttpSendBacklogItem)+conn->priv->sendBuffLen);
if (i==NULL) {
error("Httpd: Backlog: malloc failed, out of memory!");
return;
}
memcpy(i->data, conn->priv->sendBuff, conn->priv->sendBuffLen);
i->len=conn->priv->sendBuffLen;
i->next=NULL;
if (conn->priv->sendBacklog==NULL) {
conn->priv->sendBacklog=i;
} else {
HttpSendBacklogItem *e=conn->priv->sendBacklog;
while (e->next!=NULL) e=e->next;
e->next=i;
}
conn->priv->sendBacklogSize+=conn->priv->sendBuffLen;
}
conn->priv->sendBuffLen=0;
}
}
void ICACHE_FLASH_ATTR httpdCgiIsDone(HttpdConnData *conn) {
conn->cgi=NULL; //no need to call this anymore
if (conn->priv->flags&HFL_CHUNKED) {
dbg("Pool slot %d is done. Cleaning up for next req", conn->slot);
httpdFlushSendBuffer(conn);
//Note: Do not clean up sendBacklog, it may still contain data at this point.
conn->priv->headPos=0;
conn->post->len=-1;
conn->priv->flags=0;
if (conn->post->buff) free(conn->post->buff);
conn->post->buff=NULL;
conn->post->buffLen=0;
conn->post->received=0;
conn->hostName=NULL;
} else {
//Cannot re-use this connection. Mark to get it killed after all data is sent.
conn->priv->flags|=HFL_DISCONAFTERSENT;
}
}
//Callback called when the data on a socket has been successfully
//sent.
void ICACHE_FLASH_ATTR httpdSentCb(ConnTypePtr rconn, char *remIp, int remPort) {
int r;
HttpdConnData *conn=httpdFindConnData(rconn, remIp, remPort);
char *sendBuff;
if (conn==NULL) return;
if (conn->priv->sendBacklog!=NULL) {
//We have some backlog to send first.
HttpSendBacklogItem *next=conn->priv->sendBacklog->next;
httpdPlatSendData(conn->conn, conn->priv->sendBacklog->data, conn->priv->sendBacklog->len);
conn->priv->sendBacklogSize-=conn->priv->sendBacklog->len;
free(conn->priv->sendBacklog);
conn->priv->sendBacklog=next;
return;
}
if (conn->priv->flags&HFL_DISCONAFTERSENT) { //Marked for destruction?
dbg("Pool slot %d is done. Closing.", conn->slot);
httpdPlatDisconnect(conn->conn);
return; //No need to call httpdFlushSendBuffer.
}
//If we don't have a CGI function, there's nothing to do but wait for something from the client.
if (conn->cgi==NULL) return;
sendBuff=malloc(MAX_SENDBUFF_LEN);
conn->priv->sendBuff=sendBuff;
conn->priv->sendBuffLen=0;
r=conn->cgi(conn); //Execute cgi fn.
if (r==HTTPD_CGI_DONE) {
httpdCgiIsDone(conn);
}
if (r==HTTPD_CGI_NOTFOUND || r==HTTPD_CGI_AUTHENTICATED) {
error("ERROR! CGI fn returns code %d after sending data! Bad CGI!", r);
httpdCgiIsDone(conn);
}
httpdFlushSendBuffer(conn);
free(sendBuff);
}
//This is called when the headers have been received and the connection is ready to send
//the result headers and data.
//We need to find the CGI function to call, call it, and dependent on what it returns either
//find the next cgi function, wait till the cgi data is sent or close up the connection.
static void ICACHE_FLASH_ATTR httpdProcessRequest(HttpdConnData *conn) {
int r;
int i=0;
if (conn->url==NULL) {
error("WtF? url = NULL");
return; //Shouldn't happen
}
if (conn->requestType == HTTPD_METHOD_OPTIONS /*&& conn->priv->chunkHdr[0] != 0*/) {
// we have a CORS preflight
httpdStartResponse(conn, 200);
httpdHeader(conn, "Access-Control-Allow-Headers", conn->priv->corsToken);
httpdEndHeaders(conn);
httpdCgiIsDone(conn);
dbg("CORS preflight resp sent.");
return;
}
//See if we can find a CGI that's happy to handle the request.
while (1) {
//Look up URL in the built-in URL table.
while (builtInUrls[i].url!=NULL) {
int match=0;
//See if there's a literal match
if (strcmp(builtInUrls[i].url, conn->url)==0) match=1;
//See if there's a wildcard match
if (builtInUrls[i].url[strlen(builtInUrls[i].url)-1]=='*' &&
strncmp(builtInUrls[i].url, conn->url, strlen(builtInUrls[i].url)-1)==0) match=1;
if (match) {
dbg("Is url index %d", i);
conn->cgiData=NULL;
conn->cgi=builtInUrls[i].cgiCb;
conn->cgiArg=builtInUrls[i].cgiArg;
conn->cgiArg2=builtInUrls[i].cgiArg2;
break;
}
i++;
}
if (builtInUrls[i].url==NULL) {
//Drat, we're at the end of the URL table. This usually shouldn't happen. Well, just
//generate a built-in 404 to handle this.
warn("%s not found. 404!", conn->url);
conn->cgi=cgiNotFound;
}
//Okay, we have a CGI function that matches the URL. See if it wants to handle the
//particular URL we're supposed to handle.
r=conn->cgi(conn);
if (r==HTTPD_CGI_MORE) {
//Yep, it's happy to do so and has more data to send.
if (conn->recvHdl) {
//Seems the CGI is planning to do some long-term communications with the socket.
//Disable the timeout on it, so we won't run into that.
httpdPlatDisableTimeout(conn->conn);
}
httpdFlushSendBuffer(conn);
return;
} else if (r==HTTPD_CGI_DONE) {
//Yep, it's happy to do so and already is done sending data.
httpdCgiIsDone(conn);
return;
} else if (r==HTTPD_CGI_NOTFOUND || r==HTTPD_CGI_AUTHENTICATED) {
//URL doesn't want to handle the request: either the data isn't found or there's no
//need to generate a login screen.
i++; //look at next url the next iteration of the loop.
}
}
}
//Parse a line of header data and modify the connection data accordingly.
static void ICACHE_FLASH_ATTR httpdParseHeader(char *h, HttpdConnData *conn) {
int i;
char firstLine=0;
if (strncmp(h, "GET ", 4)==0) {
conn->requestType = HTTPD_METHOD_GET;
firstLine=1;
} else if (strncmp(h, "Host:", 5)==0) {
i=5;
while (h[i]==' ') i++;
conn->hostName=&h[i];
} else if (strncmp(h, "POST ", 5)==0) {
conn->requestType = HTTPD_METHOD_POST;
firstLine=1;
} else if (strncmp(h, "OPTIONS ", 8)==0) {
conn->requestType = HTTPD_METHOD_OPTIONS;
firstLine=1;
}
if (firstLine) {
char *e;
//Skip past the space after POST/GET
i=0;
while (h[i]!=' ') i++;
conn->url=h+i+1;
//Figure out end of url.
e=(char*)strstr(conn->url, " ");
if (e==NULL) return; //wtf?
*e=0; //terminate url part
e++; //Skip to protocol indicator
while (*e==' ') e++; //Skip spaces.
//If HTTP/1.1, note that and set chunked encoding
if (strcasecmp(e, "HTTP/1.1")==0) conn->priv->flags|=HFL_HTTP11|HFL_CHUNKED;
info("Incoming request, URL = %s", conn->url);
//Parse out the URL part before the GET parameters.
conn->getArgs=(char*)strstr(conn->url, "?");
if (conn->getArgs!=0) {
*conn->getArgs=0;
conn->getArgs++;
dbg("GET args = %s", conn->getArgs);
} else {
conn->getArgs=NULL;
}
} else if (strncmp(h, "Connection:", 11)==0) {
i=11;
//Skip trailing spaces
while (h[i]==' ') i++;
if (strncmp(&h[i], "close", 5)==0) conn->priv->flags&=~HFL_CHUNKED; //Don't use chunked conn
} else if (strncmp(h, "Content-Length:", 15)==0) {
i=15;
//Skip trailing spaces
while (h[i]==' ') i++;
//Get POST data length
conn->post->len=atoi(h+i);
// Allocate the buffer
if (conn->post->len > MAX_POST) {
// we'll stream this in in chunks
conn->post->buffSize = MAX_POST;
} else {
conn->post->buffSize = conn->post->len;
}
dbg("Malloc'd buffer for %d + 1 bytes of post data.", conn->post->buffSize);
conn->post->buff=(char*)malloc(conn->post->buffSize + 1);
conn->post->buffLen=0;
} else if (strncmp(h, "Content-Type: ", 14)==0) {
if (strstr(h, "multipart/form-data")) {
// It's multipart form data so let's pull out the boundary for future use
char *b;
if ((b = strstr(h, "boundary=")) != NULL) {
conn->post->multipartBoundary = b + 7; // move the pointer 2 chars before boundary then fill them with dashes
conn->post->multipartBoundary[0] = '-';
conn->post->multipartBoundary[1] = '-';
dbg("boundary = %s", conn->post->multipartBoundary);
}
}
} else if (strncmp(h, "Access-Control-Request-Headers: ", 32)==0) {
// CORS crap that needs to be repeated in the response
info("CORS preflight request.");
// int len = strlen(h);
// info("h = %s, len %d", h, len);
strncpy(conn->priv->corsToken, h+32, MAX_CORS_TOKEN_LEN);
}
}
//Callback called when there's data available on a socket.
void httpdRecvCb(ConnTypePtr rconn, char *remIp, int remPort, char *data, unsigned short len) {
int x, r;
char *p, *e;
char *sendBuff=malloc(MAX_SENDBUFF_LEN);
HttpdConnData *conn=httpdFindConnData(rconn, remIp, remPort);
if (conn==NULL) return;
conn->priv->sendBuff=sendBuff;
conn->priv->sendBuffLen=0;
conn->priv->corsToken[0] = 0;
//This is slightly evil/dirty: we abuse conn->post->len as a state variable for where in the http communications we are:
//<0 (-1): Post len unknown because we're still receiving headers
//==0: No post data
//>0: Need to receive post data
//ToDo: See if we can use something more elegant for this.
for (x=0; x<len; x++) {
if (conn->post->len<0) {
//This byte is a header byte.
if (data[x]=='\n') {
//Compatibility with clients that send \n only: fake a \r in front of this.
if (conn->priv->headPos!=0 && conn->priv->head[conn->priv->headPos-1]!='\r') {
conn->priv->head[conn->priv->headPos++]='\r';
}
}
//ToDo: return http error code 431 (request header too long) if this happens
if (conn->priv->headPos!=MAX_HEAD_LEN) conn->priv->head[conn->priv->headPos++]=data[x];
conn->priv->head[conn->priv->headPos]=0;
//Scan for /r/n/r/n. Receiving this indicate the headers end.
if (data[x]=='\n' && (char *)strstr(conn->priv->head, "\r\n\r\n")!=NULL) {
//Indicate we're done with the headers.
conn->post->len=0;
//Reset url data
conn->url=NULL;
//Iterate over all received headers and parse them.
p=conn->priv->head;
while(p<(&conn->priv->head[conn->priv->headPos-4])) {
e=(char *)strstr(p, "\r\n"); //Find end of header line
if (e==NULL) break; //Shouldn't happen.
e[0]=0; //Zero-terminate header
httpdParseHeader(p, conn); //and parse it.
p=e+2; //Skip /r/n (now /0/n)
}
//If we don't need to receive post data, we can send the response now.
if (conn->post->len==0) {
httpdProcessRequest(conn);
}
}
} else if (conn->post->len!=0) {
//This byte is a POST byte.
conn->post->buff[conn->post->buffLen++]=data[x];
conn->post->received++;
conn->hostName=NULL;
if (conn->post->buffLen >= conn->post->buffSize || conn->post->received == conn->post->len) {
//Received a chunk of post data
conn->post->buff[conn->post->buffLen]=0; //zero-terminate, in case the cgi handler knows it can use strings
//Process the data
if (conn->cgi) {
r=conn->cgi(conn);
if (r==HTTPD_CGI_DONE) {
httpdCgiIsDone(conn);
}
} else {
//No CGI fn set yet: probably first call. Allow httpdProcessRequest to choose CGI and
//call it the first time.
httpdProcessRequest(conn);
}
conn->post->buffLen = 0;
}
} else {
//Let cgi handle data if it registered a recvHdl callback. If not, ignore.
if (conn->recvHdl) {
r=conn->recvHdl(conn, data+x, len-x);
if (r==HTTPD_CGI_DONE) {
dbg("Recvhdl returned DONE");
httpdCgiIsDone(conn);
//We assume the recvhdlr has sent something; we'll kill the sock in the sent callback.
}
break; //ignore rest of data, recvhdl has parsed it.
} else {
warn("Eh? Got unexpected data from client. %s", data);
}
}
}
if (conn->conn) httpdFlushSendBuffer(conn);
free(sendBuff);
}
//The platform layer should ALWAYS call this function, regardless if the connection is closed by the server
//or by the client.
void ICACHE_FLASH_ATTR httpdDisconCb(ConnTypePtr rconn, char *remIp, int remPort) {
HttpdConnData *hconn=httpdFindConnData(rconn, remIp, remPort);
if (hconn==NULL) return;
info("Pool slot %d: socket closed.", hconn->slot);
hconn->conn=NULL; //indicate cgi the connection is gone
if (hconn->cgi) hconn->cgi(hconn); //Execute cgi fn if needed
httpdRetireConn(hconn);
}
int ICACHE_FLASH_ATTR httpdConnectCb(ConnTypePtr conn, char *remIp, int remPort) {
static int failed_cnt = 0;
int i;
//Find empty conndata in pool
for (i=0; i<HTTPD_MAX_CONNECTIONS; i++) if (connData[i]==NULL) break;
info("Conn req from %d.%d.%d.%d:%d, using pool slot %d", remIp[0]&0xff, remIp[1]&0xff, remIp[2]&0xff, remIp[3]&0xff, remPort, i);
if (i==HTTPD_MAX_CONNECTIONS) {
error("Aiee, conn pool overflow!");
failed_cnt++;
if (failed_cnt >= 5) {
error("5 failed connections, this is bad. GOING FOR RESTART!");
system_restart();
}
return 0;
}
failed_cnt = 0;
connData[i]=malloc(sizeof(HttpdConnData));
memset(connData[i], 0, sizeof(HttpdConnData));
connData[i]->priv=malloc(sizeof(HttpdPriv));
memset(connData[i]->priv, 0, sizeof(HttpdPriv));
connData[i]->conn=conn;
connData[i]->slot=i;
connData[i]->priv->headPos=0;
connData[i]->post=malloc(sizeof(HttpdPostData));
memset(connData[i]->post, 0, sizeof(HttpdPostData));
connData[i]->post->buff=NULL;
connData[i]->post->buffLen=0;
connData[i]->post->received=0;
connData[i]->post->len=-1;
connData[i]->hostName=NULL;
connData[i]->remote_port=remPort;
connData[i]->priv->sendBacklog=NULL;
connData[i]->priv->sendBacklogSize=0;
memcpy(connData[i]->remote_ip, remIp, 4);
return 1;
}
//Httpd initialization routine. Call this to kick off webserver functionality.
void ICACHE_FLASH_ATTR httpdInit(HttpdBuiltInUrl *fixedUrls, int port) {
int i;
for (i=0; i<HTTPD_MAX_CONNECTIONS; i++) {
connData[i]=NULL;
}
builtInUrls=fixedUrls;
httpdPlatInit(port, HTTPD_MAX_CONNECTIONS);
info("Httpd started.");
}