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838 lines
27 KiB
838 lines
27 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 <esp8266.h>
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#include "httpd.h"
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#include "httpd-platform.h"
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//Max length of request head. This is statically allocated for each connection.
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#define MAX_HEAD_LEN 1024
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//Max post buffer len. This is dynamically malloc'ed if needed.
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#define MAX_POST 1024
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//Max send buffer len. This is allocated on the stack.
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#define MAX_SENDBUFF_LEN 2048
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//If some data can't be sent because the underlaying socket doesn't accept the data (like the nonos
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//layer is prone to do), we put it in a backlog that is dynamically malloc'ed. This defines the max
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//size of the backlog.
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#define MAX_BACKLOG_SIZE (4*1024)
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#define MAX_CORS_TOKEN_LEN 256
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//This gets set at init time.
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static HttpdBuiltInUrl *builtInUrls;
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typedef struct HttpSendBacklogItem HttpSendBacklogItem;
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struct HttpSendBacklogItem {
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int len;
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HttpSendBacklogItem *next;
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char data[];
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};
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//Flags
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#define HFL_HTTP11 (1<<0)
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#define HFL_CHUNKED (1<<1)
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#define HFL_SENDINGBODY (1<<2)
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#define HFL_DISCONAFTERSENT (1<<3)
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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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char corsToken[MAX_CORS_TOKEN_LEN];
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int headPos;
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char *sendBuff;
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int sendBuffLen;
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char *chunkHdr;
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HttpSendBacklogItem *sendBacklog;
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int sendBacklogSize;
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int flags;
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};
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//Connection pool
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static HttpdConnData *connPool[HTTPD_MAX_CONNECTIONS];
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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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//#define RSTR(a) ((const char)(a))
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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 ICACHE_RODATA_ATTR MimeMap mimeTypes[]={
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// html
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{"html", "text/html"},
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{"css", "text/css"},
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{"json", "application/json"},
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{"js", "text/javascript"},
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{"txt", "text/plain"},
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{"csv", "text/csv"},
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// images
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{"ico", "image/x-icon"},
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{"jpg", "image/jpeg"},
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{"png", "image/png"},
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{"svg", "image/svg+xml"},
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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(const char *filepath) {
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int i=0;
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//Go find the extension (searching from the end)
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const char *ext=filepath+(strlen(filepath)-1);
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while (ext!=filepath && *ext!='.') ext--;
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if (*ext=='.') ext++;
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//ToDo: strcmp is case sensitive; we may want to do case-intensive matching here...
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while (mimeTypes[i].ext!=NULL && strcmp(ext, mimeTypes[i].ext)!=0) i++;
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if (mimeTypes[i].ext == NULL) {
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// we didn't find any proper match
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if (strncmp(filepath, "/json/", 6) == 0) {
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// if it's in the json folder, it surely is json!
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return "application/json";
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}
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}
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return mimeTypes[i].mimetype;
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}
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//Looks up the connData info for a specific connection
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static HttpdConnData ICACHE_FLASH_ATTR *httpdFindConnData(ConnTypePtr conn, const char *remIp, int remPort) {
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for (int i=0; i<HTTPD_MAX_CONNECTIONS; i++) {
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if (connPool[i] && connPool[i]->remote_port == remPort &&
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memcmp(connPool[i]->remote_ip, remIp, 4) == 0) {
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connPool[i]->conn=conn;
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return connPool[i];
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}
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}
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//Shouldn't happen.
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error("*** Unknown connection %d.%d.%d.%d:%d", remIp[0]&0xff, remIp[1]&0xff, remIp[2]&0xff, remIp[3]&0xff, remPort);
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httpdPlatDisconnect(conn);
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return NULL;
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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->priv->sendBacklog!=NULL) {
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HttpSendBacklogItem *i, *j;
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i=conn->priv->sendBacklog;
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do {
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j=i;
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i=i->next;
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free(j);
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} while (i!=NULL);
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}
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if (conn->post->buff!=NULL) free(conn->post->buff);
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if (conn->post!=NULL) free(conn->post);
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if (conn->priv!=NULL) free(conn->priv);
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if (conn) free(conn);
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for (int i=0; i<HTTPD_MAX_CONNECTIONS; i++) {
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if (connPool[i]==conn) connPool[i]=NULL;
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}
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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 ICACHE_FLASH_ATTR 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 ICACHE_FLASH_ATTR 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++]=(char)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 -1;
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p=line;
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while(p!=NULL && *p!='\n' && *p!='\r' && *p!=0) {
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// httpd_printf("findArg: %s\n", p);
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if (strncmp(p, arg, strlen(arg))==0 && p[strlen(arg)]=='=') {
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p+=strlen(arg)+1; //move p to start of value
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e=(char*)strstr(p, "&");
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if (e==NULL) e=p+strlen(p);
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// httpd_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*)strstr(p, "&");
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if (p!=NULL) p+=1;
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}
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// warn("Finding %s in %s: Not found :/", arg, line);
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return -1; //not found
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}
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//Get the value of a certain header in the HTTP client head
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//Returns true when found, false when not found.
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int ICACHE_FLASH_ATTR httpdGetHeader(HttpdConnData *conn, char *header, char *ret, int retLen) {
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char *p=conn->priv->head;
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p=p+strlen(p)+1; //skip GET/POST part
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p=p+strlen(p)+1; //skip HTTP part
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while (p<(conn->priv->head+conn->priv->headPos)) {
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while(*p<=32 && *p!=0) p++; //skip crap at start
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//See if this is the header
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if (strncmp(p, header, strlen(header))==0 && p[strlen(header)]==':') {
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//Skip 'key:' bit of header line
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p=p+strlen(header)+1;
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//Skip past spaces after the colon
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while(*p==' ') p++;
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//Copy from p to end
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while (*p!=0 && *p!='\r' && *p!='\n' && retLen>1) {
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*ret++=*p++;
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retLen--;
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}
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//Zero-terminate string
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*ret=0;
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//All done :)
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return 1;
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}
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p+=strlen(p)+1; //Skip past end of string and \0 terminator
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}
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return 0;
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}
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//Call before calling httpdStartResponse to disable automatically-chosen transfer
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//encodings (specifically, for now, chunking) and fall back on Connection: Close.
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void ICACHE_FLASH_ATTR httpdDisableTransferEncoding(HttpdConnData *conn) {
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conn->priv->flags&=~HFL_CHUNKED;
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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[256];
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int l;
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l=sprintf(buff, "HTTP/1.%d %d OK\r\nServer: esp8266-httpd/"HTTPDVER"\r\n%s\r\n",
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(conn->priv->flags&HFL_HTTP11)?1:0,
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code,
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(conn->priv->flags&HFL_CHUNKED)?"Transfer-Encoding: chunked":"Connection: close");
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httpdSend(conn, buff, l);
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// CORS headers
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httpdSend(conn, "Access-Control-Allow-Origin: *\r\n", -1);
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httpdSend(conn, "Access-Control-Allow-Methods: GET,POST,OPTIONS\r\n", -1);
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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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httpdSend(conn, field, -1);
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httpdSend(conn, ": ", -1);
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httpdSend(conn, val, -1);
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httpdSend(conn, "\r\n", -1);
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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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httpdSend(conn, "\r\n", -1);
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conn->priv->flags|=HFL_SENDINGBODY;
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}
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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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httpdStartResponse(conn, 302);
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httpdHeader(conn, "Location", newUrl);
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httpdEndHeaders(conn);
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httpdSend(conn, "Moved to ", -1);
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httpdSend(conn, newUrl, -1);
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}
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//Use this as a cgi function to redirect one url to another.
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httpd_cgi_state 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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//Used to spit out a 404 error
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static httpd_cgi_state ICACHE_FLASH_ATTR cgiNotFound(HttpdConnData *connData) {
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if (connData->conn==NULL) return HTTPD_CGI_DONE;
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httpdStartResponse(connData, 404);
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httpdEndHeaders(connData);
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httpdSend(connData, "404 File not found.", -1);
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return HTTPD_CGI_DONE;
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}
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//This CGI function redirects to a fixed url of http://[hostname]/ if hostname field of request isn't
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//already that hostname. Use this in combination with a DNS server that redirects everything to the
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//ESP in order to load a HTML page as soon as a phone, tablet etc connects to the ESP. Watch out:
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//this will also redirect connections when the ESP is in STA mode, potentially to a hostname that is not
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//in the 'official' DNS and so will fail.
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httpd_cgi_state ICACHE_FLASH_ATTR cgiRedirectToHostname(HttpdConnData *connData) {
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static const char hostFmt[]="http://%s/";
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char *buff;
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int isIP=0;
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int x;
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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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if (connData->hostName==NULL) {
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warn("Huh? No hostname.\n");
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return HTTPD_CGI_NOTFOUND;
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}
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//Quick and dirty code to see if host is an IP
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if (strlen(connData->hostName)>8) {
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isIP=1;
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for (x=0; x<strlen(connData->hostName); x++) {
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if (connData->hostName[x]!='.' && (connData->hostName[x]<'0' || connData->hostName[x]>'9')) isIP=0;
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}
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}
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if (isIP) return HTTPD_CGI_NOTFOUND;
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//Check hostname; pass on if the same
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if (strcmp(connData->hostName, (char*)connData->cgiArg)==0) return HTTPD_CGI_NOTFOUND;
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//Not the same. Redirect to real hostname.
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buff=malloc(strlen((char*)connData->cgiArg)+sizeof(hostFmt));
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sprintf(buff, hostFmt, (char*)connData->cgiArg);
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dbg("Redirecting to hostname url %s", buff);
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httpdRedirect(connData, buff);
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free(buff);
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return HTTPD_CGI_DONE;
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}
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//Same as above, but will only redirect clients with an IP that is in the range of
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//the SoftAP interface. This should preclude clients connected to the STA interface
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//to be redirected to nowhere.
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httpd_cgi_state ICACHE_FLASH_ATTR cgiRedirectApClientToHostname(HttpdConnData *connData) {
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#ifndef FREERTOS
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uint32 *remadr;
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struct ip_info apip;
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int x=wifi_get_opmode();
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//Check if we have an softap interface; bail out if not
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if (x!=2 && x!=3) return HTTPD_CGI_NOTFOUND;
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remadr=(uint32 *)connData->remote_ip;
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wifi_get_ip_info(SOFTAP_IF, &apip);
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if ((*remadr & apip.netmask.addr) == (apip.ip.addr & apip.netmask.addr)) {
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return cgiRedirectToHostname(connData);
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} else {
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return HTTPD_CGI_NOTFOUND;
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}
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#else
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return HTTPD_CGI_NOTFOUND;
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#endif
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}
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//Add data to the send buffer. len is the length of the data. If len is -1
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//the data is seen as a C-string.
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//Returns 1 for success, 0 for out-of-memory.
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int ICACHE_FLASH_ATTR httpdSend(HttpdConnData *conn, const char *data, int len) {
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if (conn->conn==NULL) return 0;
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if (len<0) len=strlen(data);
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if (len==0) return 0;
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if (conn->priv->flags&HFL_CHUNKED && conn->priv->flags&HFL_SENDINGBODY && conn->priv->chunkHdr==NULL) {
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if (conn->priv->sendBuffLen+len+6>MAX_SENDBUFF_LEN) return 0;
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//Establish start of chunk
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conn->priv->chunkHdr=&conn->priv->sendBuff[conn->priv->sendBuffLen];
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strcpy(conn->priv->chunkHdr, "0000\r\n");
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conn->priv->sendBuffLen+=6;
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}
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if (conn->priv->sendBuffLen+len>MAX_SENDBUFF_LEN) return 0;
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memcpy(conn->priv->sendBuff+conn->priv->sendBuffLen, data, len);
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conn->priv->sendBuffLen+=len;
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return 1;
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}
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static char ICACHE_FLASH_ATTR httpdHexNibble(int val) {
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val&=0xf;
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if (val<10) return '0'+val;
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return 'A'+(val-10);
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}
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//Function to send any data in conn->priv->sendBuff. Do not use in CGIs unless you know what you
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//are doing! Also, if you do set conn->cgi to NULL to indicate the connection is closed, do it BEFORE
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//calling this.
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void ICACHE_FLASH_ATTR httpdFlushSendBuffer(HttpdConnData *conn) {
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int r, len;
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if (conn->conn==NULL) return;
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if (conn->priv->chunkHdr!=NULL) {
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//We're sending chunked data, and the chunk needs fixing up.
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//Finish chunk with cr/lf
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httpdSend(conn, "\r\n", 2);
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//Calculate length of chunk
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len=((&conn->priv->sendBuff[conn->priv->sendBuffLen])-conn->priv->chunkHdr)-8;
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//Fix up chunk header to correct value
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conn->priv->chunkHdr[0]=httpdHexNibble(len>>12);
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conn->priv->chunkHdr[1]=httpdHexNibble(len>>8);
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conn->priv->chunkHdr[2]=httpdHexNibble(len>>4);
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conn->priv->chunkHdr[3]=httpdHexNibble(len>>0);
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//Reset chunk hdr for next call
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conn->priv->chunkHdr=NULL;
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}
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if (conn->priv->flags&HFL_CHUNKED && conn->priv->flags&HFL_SENDINGBODY && conn->cgi==NULL) {
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//Connection finished sending whatever needs to be sent. Add NULL chunk to indicate this.
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strcpy(&conn->priv->sendBuff[conn->priv->sendBuffLen], "0\r\n\r\n");
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conn->priv->sendBuffLen+=5;
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}
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if (conn->priv->sendBuffLen!=0) {
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r=httpdPlatSendData(conn->conn, conn->priv->sendBuff, conn->priv->sendBuffLen);
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if (!r) {
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//Can't send this for some reason. Dump packet in backlog, we can send it later.
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if (conn->priv->sendBacklogSize+conn->priv->sendBuffLen>MAX_BACKLOG_SIZE) {
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error("Httpd: Backlog: Exceeded max backlog size, dropped %d bytes instead of sending them.", conn->priv->sendBuffLen);
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conn->priv->sendBuffLen=0;
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return;
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}
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HttpSendBacklogItem *i=malloc(sizeof(HttpSendBacklogItem)+conn->priv->sendBuffLen);
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if (i==NULL) {
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error("Httpd: Backlog: malloc failed, out of memory!");
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return;
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}
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memcpy(i->data, conn->priv->sendBuff, conn->priv->sendBuffLen);
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i->len=conn->priv->sendBuffLen;
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i->next=NULL;
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if (conn->priv->sendBacklog==NULL) {
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conn->priv->sendBacklog=i;
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} else {
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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 (strstarts(h, "GET ")) {
|
|
conn->requestType = HTTPD_METHOD_GET;
|
|
firstLine=1;
|
|
} else if (strstarts(h, "POST ")) {
|
|
conn->requestType = HTTPD_METHOD_POST;
|
|
firstLine=1;
|
|
} else if (strstarts(h, "PUT ")) {
|
|
conn->requestType = HTTPD_METHOD_PUT;
|
|
firstLine=1;
|
|
} else if (strstarts(h, "OPTIONS ")) {
|
|
conn->requestType = HTTPD_METHOD_OPTIONS;
|
|
firstLine=1;
|
|
} else if (strstarts(h, "Host:")) {
|
|
i=5;
|
|
while (h[i]==' ') i++;
|
|
conn->hostName=&h[i];
|
|
}
|
|
|
|
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 (strstarts(h, "Connection:")) {
|
|
i=11;
|
|
//Skip trailing spaces
|
|
while (h[i]==' ') i++;
|
|
if (strstarts(&h[i], "close")) conn->priv->flags&=~HFL_CHUNKED; //Don't use chunked conn
|
|
} else if (strstarts(h, "Content-Length:")) {
|
|
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 (strstarts(h, "Content-Type: ")) {
|
|
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 (strstarts(h, "Access-Control-Request-Headers: ")) {
|
|
// 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 (connPool[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;
|
|
|
|
connPool[i]=malloc(sizeof(HttpdConnData));
|
|
memset(connPool[i], 0, sizeof(HttpdConnData));
|
|
connPool[i]->priv=malloc(sizeof(HttpdPriv));
|
|
memset(connPool[i]->priv, 0, sizeof(HttpdPriv));
|
|
connPool[i]->conn=conn;
|
|
connPool[i]->slot=i;
|
|
connPool[i]->priv->headPos=0;
|
|
connPool[i]->post=malloc(sizeof(HttpdPostData));
|
|
memset(connPool[i]->post, 0, sizeof(HttpdPostData));
|
|
connPool[i]->post->buff=NULL;
|
|
connPool[i]->post->buffLen=0;
|
|
connPool[i]->post->received=0;
|
|
connPool[i]->post->len=-1;
|
|
connPool[i]->hostName=NULL;
|
|
connPool[i]->remote_port=remPort;
|
|
connPool[i]->priv->sendBacklog=NULL;
|
|
connPool[i]->priv->sendBacklogSize=0;
|
|
memcpy(connPool[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++) {
|
|
connPool[i]=NULL;
|
|
}
|
|
builtInUrls=fixedUrls;
|
|
|
|
httpdPlatInit(port, HTTPD_MAX_CONNECTIONS);
|
|
info("Httpd started.");
|
|
}
|
|
|