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415 lines
12 KiB
415 lines
12 KiB
/*
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Esp8266 http server - core routines
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*/
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/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* Jeroen Domburg <jeroen@spritesmods.com> wrote this file. As long as you retain
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* this notice you can do whatever you want with this stuff. If we meet some day,
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* and you think this stuff is worth it, you can buy me a beer in return.
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* ----------------------------------------------------------------------------
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*/
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#include "espmissingincludes.h"
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#include "c_types.h"
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#include "user_interface.h"
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#include "espconn.h"
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#include "mem.h"
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#include "osapi.h"
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#include "espconn.h"
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#include "httpd.h"
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#include "io.h"
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#include "espfs.h"
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//Max length of request head
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#define MAX_HEAD_LEN 1024
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//Max amount of connections
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#define MAX_CONN 8
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//Max post buffer len
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#define MAX_POST 1024
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//This gets set at init time.
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static HttpdBuiltInUrl *builtInUrls;
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//Private data for http connection
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struct HttpdPriv {
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char head[MAX_HEAD_LEN];
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int headPos;
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int postPos;
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};
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//Connection pool
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static HttpdPriv connPrivData[MAX_CONN];
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static HttpdConnData connData[MAX_CONN];
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//Listening connection data
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static struct espconn httpdConn;
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static esp_tcp httpdTcp;
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//Struct to keep extension->mime data in
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typedef struct {
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const char *ext;
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const char *mimetype;
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} MimeMap;
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//The mappings from file extensions to mime types. If you need an extra mime type,
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//add it here.
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static const MimeMap mimeTypes[]={
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{"htm", "text/htm"},
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{"html", "text/html"},
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{"js", "text/javascript"},
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{"txt", "text/plain"},
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{"jpg", "image/jpeg"},
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{"jpeg", "image/jpeg"},
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{"png", "image/png"},
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{NULL, "text/html"}, //default value
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};
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//Returns a static char* to a mime type for a given url to a file.
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const char ICACHE_FLASH_ATTR *httpdGetMimetype(char *url) {
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int i=0;
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//Go find the extension
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char *ext=url+(strlen(url)-1);
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while (ext!=url && *ext!='.') ext--;
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if (*ext=='.') ext++;
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//ToDo: os_strcmp is case sensitive; we may want to do case-intensive matching here...
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while (mimeTypes[i].ext!=NULL && os_strcmp(ext, mimeTypes[i].ext)!=0) i++;
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return mimeTypes[i].mimetype;
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}
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//Looks up the connData info for a specific esp connection
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static HttpdConnData ICACHE_FLASH_ATTR *httpdFindConnData(void *arg) {
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int i;
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for (i=0; i<MAX_CONN; i++) {
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if (connData[i].conn==(struct espconn *)arg) return &connData[i];
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}
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os_printf("FindConnData: Huh? Couldn't find connection for %p\n", arg);
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return NULL; //WtF?
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}
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//Retires a connection for re-use
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static void ICACHE_FLASH_ATTR httpdRetireConn(HttpdConnData *conn) {
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if (conn->postBuff!=NULL) os_free(conn->postBuff);
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conn->postBuff=NULL;
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conn->cgi=NULL;
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conn->conn=NULL;
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}
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//Stupid li'l helper function that returns the value of a hex char.
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static int httpdHexVal(char c) {
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if (c>='0' && c<='9') return c-'0';
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if (c>='A' && c<='F') return c-'A'+10;
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if (c>='a' && c<='f') return c-'a'+10;
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return 0;
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}
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//Decode a percent-encoded value.
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//Takes the valLen bytes stored in val, and converts it into at most retLen bytes that
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//are stored in the ret buffer. Returns the actual amount of bytes used in ret. Also
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//zero-terminates the ret buffer.
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int httpdUrlDecode(char *val, int valLen, char *ret, int retLen) {
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int s=0, d=0;
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int esced=0, escVal=0;
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while (s<valLen && d<retLen) {
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if (esced==1) {
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escVal=httpdHexVal(val[s])<<4;
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esced=2;
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} else if (esced==2) {
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escVal+=httpdHexVal(val[s]);
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ret[d++]=escVal;
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esced=0;
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} else if (val[s]=='%') {
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esced=1;
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} else if (val[s]=='+') {
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ret[d++]=' ';
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} else {
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ret[d++]=val[s];
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}
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s++;
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}
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if (d<retLen) ret[d]=0;
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return d;
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}
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//Find a specific arg in a string of get- or post-data.
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//Line is the string of post/get-data, arg is the name of the value to find. The
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//zero-terminated result is written in buff, with at most buffLen bytes used. The
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//function returns the length of the result, or -1 if the value wasn't found. The
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//returned string will be urldecoded already.
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int ICACHE_FLASH_ATTR httpdFindArg(char *line, char *arg, char *buff, int buffLen) {
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char *p, *e;
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if (line==NULL) return 0;
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p=line;
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while(p!=NULL && *p!='\n' && *p!='\r' && *p!=0) {
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os_printf("findArg: %s\n", p);
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if (os_strncmp(p, arg, os_strlen(arg))==0 && p[strlen(arg)]=='=') {
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p+=os_strlen(arg)+1; //move p to start of value
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e=(char*)os_strstr(p, "&");
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if (e==NULL) e=p+os_strlen(p);
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os_printf("findArg: val %s len %d\n", p, (e-p));
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return httpdUrlDecode(p, (e-p), buff, buffLen);
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}
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p=(char*)os_strstr(p, "&");
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if (p!=NULL) p+=1;
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}
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os_printf("Finding %s in %s: Not found :/\n", arg, line);
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return -1; //not found
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}
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//Start the response headers.
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void ICACHE_FLASH_ATTR httpdStartResponse(HttpdConnData *conn, int code) {
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char buff[128];
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int l;
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l=os_sprintf(buff, "HTTP/1.0 %d OK\r\nServer: esp8266-httpd/"HTTPDVER"\r\n", code);
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espconn_sent(conn->conn, (uint8 *)buff, l);
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}
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//Send a http header.
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void ICACHE_FLASH_ATTR httpdHeader(HttpdConnData *conn, const char *field, const char *val) {
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char buff[256];
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int l;
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l=os_sprintf(buff, "%s: %s\r\n", field, val);
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espconn_sent(conn->conn, (uint8 *)buff, l);
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}
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//Finish the headers.
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void ICACHE_FLASH_ATTR httpdEndHeaders(HttpdConnData *conn) {
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espconn_sent(conn->conn, (uint8 *)"\r\n", 2);
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}
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//ToDo: sprintf->snprintf everywhere... esp doesn't have snprintf tho' :/
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//Redirect to the given URL.
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void ICACHE_FLASH_ATTR httpdRedirect(HttpdConnData *conn, char *newUrl) {
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char buff[1024];
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int l;
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l=os_sprintf(buff, "HTTP/1.1 302 Found\r\nLocation: %s\r\n\r\nMoved to %s\r\n", newUrl, newUrl);
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espconn_sent(conn->conn, (uint8 *)buff, l);
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}
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//Use this as a cgi function to redirect one url to another.
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int ICACHE_FLASH_ATTR cgiRedirect(HttpdConnData *connData) {
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if (connData->conn==NULL) {
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//Connection aborted. Clean up.
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return HTTPD_CGI_DONE;
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}
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httpdRedirect(connData, (char*)connData->cgiArg);
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return HTTPD_CGI_DONE;
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}
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//Callback called when the data on a socket has been successfully
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//sent.
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static void ICACHE_FLASH_ATTR httpdSentCb(void *arg) {
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int r;
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HttpdConnData *conn=httpdFindConnData(arg);
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// os_printf("Sent callback on conn %p\n", conn);
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if (conn==NULL) return;
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if (conn->cgi==NULL) { //Marked for destruction?
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os_printf("Conn %p is done. Closing.\n", conn->conn);
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espconn_disconnect(conn->conn);
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httpdRetireConn(conn);
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return;
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}
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r=conn->cgi(conn); //Execute cgi fn.
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if (r==HTTPD_CGI_DONE) {
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conn->cgi=NULL; //mark for destruction.
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}
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}
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static const char *httpNotFoundHeader="HTTP/1.0 404 Not Found\r\nServer: esp8266-httpd/0.1\r\nContent-Type: text/plain\r\n\r\nNot Found.\r\n";
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//This is called when the headers have been received and the connection is ready to send
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//the result headers and data.
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static void ICACHE_FLASH_ATTR httpdSendResp(HttpdConnData *conn) {
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int i=0;
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int r;
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//See if the url is somewhere in our internal url table.
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while (builtInUrls[i].url!=NULL && conn->url!=NULL) {
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// os_printf("%s == %s?\n", builtInUrls[i].url, conn->url);
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if (os_strcmp(builtInUrls[i].url, conn->url)==0 || builtInUrls[i].url[0]=='*') {
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os_printf("Is url index %d\n", i);
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conn->cgiData=NULL;
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conn->cgi=builtInUrls[i].cgiCb;
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conn->cgiArg=builtInUrls[i].cgiArg;
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r=conn->cgi(conn);
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if (r!=HTTPD_CGI_NOTFOUND) {
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if (r==HTTPD_CGI_DONE) conn->cgi=NULL; //If cgi finishes immediately: mark conn for destruction.
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return;
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}
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}
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i++;
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}
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//Can't find :/
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os_printf("%s not found. 404!\n", conn->url);
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espconn_sent(conn->conn, (uint8 *)httpNotFoundHeader, os_strlen(httpNotFoundHeader));
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conn->cgi=NULL; //mark for destruction
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}
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//Parse a line of header data and modify the connection data accordingly.
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static void ICACHE_FLASH_ATTR httpdParseHeader(char *h, HttpdConnData *conn) {
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int i;
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// os_printf("Got header %s\n", h);
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if (os_strncmp(h, "GET ", 4)==0 || os_strncmp(h, "POST ", 5)==0) {
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char *e;
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//Skip past the space after POST/GET
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i=0;
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while (h[i]!=' ') i++;
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conn->url=h+i+1;
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//Figure out end of url.
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e=(char*)os_strstr(conn->url, " ");
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if (e==NULL) return; //wtf?
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*e=0; //terminate url part
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os_printf("URL = %s\n", conn->url);
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//Parse out the URL part before the GET parameters.
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conn->getArgs=(char*)os_strstr(conn->url, "?");
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if (conn->getArgs!=0) {
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*conn->getArgs=0;
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conn->getArgs++;
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os_printf("GET args = %s\n", conn->getArgs);
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} else {
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conn->getArgs=NULL;
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}
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} else if (os_strncmp(h, "Content-Length: ", 16)==0) {
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i=0;
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//Skip trailing spaces
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while (h[i]!=' ') i++;
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//Get POST data length
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conn->postLen=atoi(h+i+1);
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//Clamp if too big. Hmm, maybe we should error out instead?
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if (conn->postLen>MAX_POST) conn->postLen=MAX_POST;
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os_printf("Mallocced buffer for %d bytes of post data.\n", conn->postLen);
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//Alloc the memory.
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conn->postBuff=(char*)os_malloc(conn->postLen+1);
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conn->priv->postPos=0;
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}
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}
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//Callback called when there's data available on a socket.
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static void ICACHE_FLASH_ATTR httpdRecvCb(void *arg, char *data, unsigned short len) {
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int x;
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char *p, *e;
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HttpdConnData *conn=httpdFindConnData(arg);
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if (conn==NULL) return;
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for (x=0; x<len; x++) {
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if (conn->priv->headPos!=-1) {
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//This byte is a header byte.
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if (conn->priv->headPos!=MAX_HEAD_LEN) conn->priv->head[conn->priv->headPos++]=data[x];
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conn->priv->head[conn->priv->headPos]=0;
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//Scan for /r/n/r/n
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if (data[x]=='\n' && (char *)os_strstr(conn->priv->head, "\r\n\r\n")!=NULL) {
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//Reset url data
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conn->url=NULL;
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//Find end of next header line
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p=conn->priv->head;
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while(p<(&conn->priv->head[conn->priv->headPos-4])) {
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e=(char *)os_strstr(p, "\r\n");
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if (e==NULL) break;
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e[0]=0;
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httpdParseHeader(p, conn);
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p=e+2;
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}
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//If we don't need to receive post data, we can send the response now.
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if (conn->postLen==0) {
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httpdSendResp(conn);
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}
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conn->priv->headPos=-1; //Indicate we're done with the headers.
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}
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} else if (conn->priv->postPos!=-1 && conn->postLen!=0 && conn->priv->postPos <= conn->postLen) {
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//This byte is a POST byte.
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conn->postBuff[conn->priv->postPos++]=data[x];
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if (conn->priv->postPos>=conn->postLen) {
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//Received post stuff.
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conn->postBuff[conn->priv->postPos]=0; //zero-terminate
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conn->priv->postPos=-1;
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os_printf("Post data: %s\n", conn->postBuff);
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//Send the response.
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httpdSendResp(conn);
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return;
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}
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}
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}
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}
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static void ICACHE_FLASH_ATTR httpdReconCb(void *arg, sint8 err) {
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HttpdConnData *conn=httpdFindConnData(arg);
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os_printf("ReconCb\n");
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if (conn==NULL) return;
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//Yeah... No idea what to do here. ToDo: figure something out.
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}
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static void ICACHE_FLASH_ATTR httpdDisconCb(void *arg) {
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#if 0
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//Stupid esp sdk passes through wrong arg here, namely the one of the *listening* socket.
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//If it ever gets fixed, be sure to update the code in this snippet; it's probably out-of-date.
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HttpdConnData *conn=httpdFindConnData(arg);
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os_printf("Disconnected, conn=%p\n", conn);
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if (conn==NULL) return;
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conn->conn=NULL;
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if (conn->cgi!=NULL) conn->cgi(conn); //flush cgi data
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#endif
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//Just look at all the sockets and kill the slot if needed.
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int i;
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for (i=0; i<MAX_CONN; i++) {
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if (connData[i].conn!=NULL) {
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if (connData[i].conn->state==ESPCONN_NONE || connData[i].conn->state==ESPCONN_CLOSE) {
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connData[i].conn=NULL;
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if (connData[i].cgi!=NULL) connData[i].cgi(&connData[i]); //flush cgi data
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httpdRetireConn(&connData[i]);
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}
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}
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}
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}
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static void ICACHE_FLASH_ATTR httpdConnectCb(void *arg) {
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struct espconn *conn=arg;
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int i;
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//Find empty conndata in pool
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for (i=0; i<MAX_CONN; i++) if (connData[i].conn==NULL) break;
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os_printf("Con req, conn=%p, pool slot %d\n", conn, i);
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connData[i].priv=&connPrivData[i];
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if (i==MAX_CONN) {
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os_printf("Aiee, conn pool overflow!\n");
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espconn_disconnect(conn);
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return;
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}
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connData[i].conn=conn;
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connData[i].priv->headPos=0;
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connData[i].postBuff=NULL;
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connData[i].priv->postPos=0;
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connData[i].postLen=0;
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espconn_regist_recvcb(conn, httpdRecvCb);
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espconn_regist_reconcb(conn, httpdReconCb);
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espconn_regist_disconcb(conn, httpdDisconCb);
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espconn_regist_sentcb(conn, httpdSentCb);
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}
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void ICACHE_FLASH_ATTR httpdInit(HttpdBuiltInUrl *fixedUrls, int port) {
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int i;
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for (i=0; i<MAX_CONN; i++) {
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connData[i].conn=NULL;
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}
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httpdConn.type=ESPCONN_TCP;
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httpdConn.state=ESPCONN_NONE;
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httpdTcp.local_port=port;
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httpdConn.proto.tcp=&httpdTcp;
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builtInUrls=fixedUrls;
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os_printf("Httpd init, conn=%p\n", &httpdConn);
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espconn_regist_connectcb(&httpdConn, httpdConnectCb);
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espconn_accept(&httpdConn);
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}
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