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1897aa2eef
serval-dna/rhizome_http.c
gardners 5dc6d122a5 significant progress towards clean callback scheduler for poll() 
events and timed callbacks.
2012-06-22 16:05:49 +09:30

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/*
Serval Distributed Numbering Architecture (DNA)
Copyright (C) 2010 Paul Gardner-Stephen
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <signal.h>
#include <ctype.h>
#include "serval.h"
#include "rhizome.h"
/*
HTTP server and client code for rhizome transfers.
*/
int rhizome_server_socket=-1;
rhizome_http_request *rhizome_live_http_requests[RHIZOME_SERVER_MAX_LIVE_REQUESTS];
int rhizome_server_live_request_count=0;
// Format icon data using:
// od -vt u1 ~/Downloads/favicon.ico | cut -c9- | sed 's/ */,/g'
unsigned char favicon_bytes[]={
0,0,1,0,1,0,16,16,16,0,0,0,0,0,40,1
,0,0,22,0,0,0,40,0,0,0,16,0,0,0,32,0
,0,0,1,0,4,0,0,0,0,0,128,0,0,0,0,0
,0,0,0,0,0,0,16,0,0,0,0,0,0,0,104,158
,168,0,163,233,247,0,104,161,118,0,0,0,0,0,0,0
,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
,0,0,0,0,0,0,0,0,0,0,0,0,0,0,17,17
,17,17,17,18,34,17,17,18,34,17,17,18,34,17,17,2
,34,17,17,18,34,17,16,18,34,1,17,17,1,17,1,17
,1,16,1,16,17,17,17,17,1,17,16,16,17,17,17,17
,1,17,18,34,17,17,17,16,17,17,2,34,17,17,17,16
,17,16,18,34,17,17,17,16,17,1,17,1,17,17,17,18
,34,17,17,16,17,17,17,18,34,17,17,18,34,17,17,18
,34,17,17,18,34,17,17,16,17,17,17,18,34,17,17,16
,17,17,17,17,17,0,17,1,17,17,17,17,17,17,0,0
,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
int favicon_len=318;
int rhizome_server_start()
{
if (rhizome_server_socket>-1) return 0;
/* Only try to start http server periodically */
if (rhizome_server_socket<-1) { rhizome_server_socket++; return -1; }
struct sockaddr_in address;
int on=1;
if (debug&DEBUG_RHIZOME) WHYF("Trying to start rhizome server.");
/* Catch broken pipe signals */
signal(SIGPIPE,sigPipeHandler);
signal(SIGIO,sigIoHandler);
rhizome_server_socket=socket(AF_INET,SOCK_STREAM,0);
if (rhizome_server_socket<0)
{
rhizome_server_socket=-1000;
return WHY("socket() failed starting rhizome http server");
}
setsockopt(rhizome_server_socket, SOL_SOCKET, SO_REUSEADDR,
(char *)&on, sizeof(on));
bzero((char *) &address, sizeof(address));
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(RHIZOME_HTTP_PORT);
if (bind(rhizome_server_socket, (struct sockaddr *) &address,
sizeof(address)) < 0)
{
fd_teardown(rhizome_server_socket);
rhizome_server_socket=-1000;
if (debug&DEBUG_RHIZOME) WHY("bind() failed starting rhizome http server");
return -1;
}
int rc = ioctl(rhizome_server_socket, FIONBIO, (char *)&on);
if (rc < 0)
{
perror("ioctl() failed");
fd_teardown(rhizome_server_socket);
rhizome_server_socket=-1;
exit(-1);
}
if (listen(rhizome_server_socket,20))
{
fd_teardown(rhizome_server_socket);
rhizome_server_socket=-1;
return WHY("listen() failed starting rhizome http server");
}
/* Add Rhizome HTTPd server to list of file descriptors to watch */
fd_watch(rhizome_server_socket,rhizome_server_poll,POLL_IN);
return 0;
}
void rhizome_client_poll(int fd)
{
int rn;
for(rn=0;rn<rhizome_server_live_request_count;rn++)
{
rhizome_http_request *r=rhizome_live_http_requests[rn];
if (r->socket!=fd) continue;
switch(r->request_type)
{
case RHIZOME_HTTP_REQUEST_RECEIVING:
/* Keep reading until we have two CR/LFs in a row */
r->request[r->request_length]=0;
WHYF("http request so far: [%s]",r->request);
sigPipeFlag=0;
/* Make socket non-blocking */
fcntl(r->socket,F_SETFL,fcntl(r->socket, F_GETFL, NULL)|O_NONBLOCK);
errno=0;
int bytes=read(r->socket,&r->request[r->request_length],
RHIZOME_HTTP_REQUEST_MAXLEN-r->request_length-1);
/* If we got some data, see if we have found the end of the HTTP request */
if (bytes>0) {
int i=r->request_length-160;
int lfcount=0;
if (i<0) i=0;
r->request_length+=bytes;
if (r->request_length<RHIZOME_HTTP_REQUEST_MAXLEN)
r->request[r->request_length]=0;
dump("request",(unsigned char *)r->request,r->request_length);
for(;i<(r->request_length+bytes);i++)
{
switch(r->request[i]) {
case '\n': lfcount++; break;
case '\r': /* ignore CR */ break;
case 0: /* ignore NUL (telnet inserts them) */ break;
default: lfcount=0; break;
}
if (lfcount==2) break;
}
if (lfcount==2) {
/* We have the request. Now parse it to see if we can respond to it */
rhizome_server_parse_http_request(rn,r);
}
r->request_length+=bytes;
}
/* Make socket blocking again for poll()/select() */
fcntl(r->socket,F_SETFL,fcntl(r->socket, F_GETFL, NULL)&(~O_NONBLOCK));
if (sigPipeFlag||((bytes==0)&&(errno==0))) {
/* broken pipe, so close connection */
WHY("Closing connection due to sigpipe");
rhizome_server_close_http_request(rn);
continue;
}
break;
default:
/* Socket already has request -- so just try to send some data. */
rhizome_server_http_send_bytes(rn,r);
break;
}
/* We have processed the connection that has activity, so we can return
immediately */
return;
}
return;
}
void rhizome_server_poll(int ignored_file_descriptor)
{
struct sockaddr addr;
unsigned int addr_len=0;
int sock;
/* Deal with any new requests */
/* Make socket non-blocking */
fcntl(rhizome_server_socket,F_SETFL,
fcntl(rhizome_server_socket, F_GETFL, NULL)|O_NONBLOCK);
while ((rhizome_server_live_request_count<RHIZOME_SERVER_MAX_LIVE_REQUESTS)
&&((sock=accept(rhizome_server_socket,&addr,&addr_len))>-1))
{
rhizome_http_request *request = calloc(sizeof(rhizome_http_request),1);
request->socket=sock;
/* We are now trying to read the HTTP request */
request->request_type=RHIZOME_HTTP_REQUEST_RECEIVING;
rhizome_live_http_requests[rhizome_server_live_request_count++]=request;
/* Watch for input */
fd_watch(request->socket,rhizome_client_poll,POLL_IN);
}
fcntl(rhizome_server_socket,F_SETFL,
fcntl(rhizome_server_socket, F_GETFL, NULL)&(~O_NONBLOCK));
}
int rhizome_server_close_http_request(int i)
{
fd_teardown(rhizome_live_http_requests[i]->socket);
rhizome_server_free_http_request(rhizome_live_http_requests[i]);
/* Make it null, so that if we are the list in the list, the following
assignment still yields the correct behaviour */
rhizome_live_http_requests[i]=NULL;
rhizome_live_http_requests[i]=
rhizome_live_http_requests[rhizome_server_live_request_count-1];
rhizome_server_live_request_count--;
return 0;
}
int rhizome_server_free_http_request(rhizome_http_request *r)
{
if (r->buffer&&r->buffer_size) free(r->buffer);
if (r->blob_table) free(r->blob_table);
if (r->blob_column) free(r->blob_column);
free(r);
return 0;
}
void hexFilter(char *s)
{
char *t;
for (t = s; *s; ++s)
if (isxdigit(*s))
*t++ = *s;
*t = '\0';
}
int rhizome_server_sql_query_http_response(int rn,rhizome_http_request *r,
char *column,char *table,char *query_body,
int bytes_per_row,int dehexP)
{
/* Run the provided SQL query progressively and return the values of the first
column it returns. As the result list may be very long, we will add the
LIMIT <skip>,<count> clause to do it piece by piece.
Otherwise, the response is prefixed by a 256 byte header, including the public
key of the sending node, and allowing space for information about encryption of
the body, although encryption is not yet implemented here.
*/
if (r->buffer) { free(r->buffer); r->buffer=NULL; }
r->buffer_size=16384;
r->buffer=malloc(r->buffer_size);
if (!r->buffer) return WHY("malloc() failed to allocate response buffer");
r->buffer_length=0;
r->buffer_offset=0;
r->source_record_size=bytes_per_row;
r->source_count = 0;
sqlite_exec_int64(&r->source_count, "SELECT COUNT(*) %s", query_body);
/* Work out total response length */
long long response_bytes=256+r->source_count*r->source_record_size;
rhizome_server_http_response_header(r,200,"servalproject.org/rhizome-list",
response_bytes);
WHYF("headers consumed %d bytes.",r->buffer_length);
/* Clear and prepare response header */
bzero(&r->buffer[r->buffer_length],256);
r->buffer[r->buffer_length]=0x01; /* type of response (list) */
r->buffer[r->buffer_length+1]=0x01; /* version of response */
WHYF("Found %lld records.",r->source_count);
/* Number of records we intend to return */
r->buffer[r->buffer_length+4]=(r->source_count>>0)&0xff;
r->buffer[r->buffer_length+5]=(r->source_count>>8)&0xff;
r->buffer[r->buffer_length+6]=(r->source_count>>16)&0xff;
r->buffer[r->buffer_length+7]=(r->source_count>>24)&0xff;
r->buffer_length+=256;
/* copy our public key in to bytes 32+ */
WHY("no function yet exists to obtain our public key?");
/* build templated query */
strbuf b = strbuf_local(r->source, sizeof r->source);
strbuf_sprintf(b, "SELECT %s,rowid %s", column, query_body);
if (strbuf_overrun(b))
WHYF("SQL query overrun: %s", strbuf_str(b));
r->source_index=0;
r->source_flags=dehexP;
r->blob_column=strdup(column);
r->blob_table=strdup(table);
DEBUGF("buffer_length=%d",r->buffer_length);
/* Populate spare space in buffer with rows of data */
return rhizome_server_sql_query_fill_buffer(rn,r);
}
int rhizome_server_sql_query_fill_buffer(int rn,rhizome_http_request *r)
{
unsigned char blob_value[r->source_record_size*2+1];
WHYF("populating with sql rows at offset %d",r->buffer_length);
if (r->source_index>=r->source_count)
{
/* All done */
return 0;
}
int record_count=(r->buffer_size-r->buffer_length)/r->source_record_size;
if (record_count<1) {
WHYF("r->buffer_size=%d, r->buffer_length=%d, r->source_record_size=%d",
r->buffer_size, r->buffer_length, r->source_record_size);
return WHY("Not enough space to fit any records");
}
char query[1024];
snprintf(query,1024,"%s LIMIT %lld,%d",r->source,r->source_index,record_count);
sqlite3_stmt *statement;
WHY(query);
switch (sqlite3_prepare_v2(rhizome_db,query,-1,&statement,NULL))
{
case SQLITE_OK: case SQLITE_DONE: case SQLITE_ROW:
break;
default:
sqlite3_finalize(statement);
sqlite3_close(rhizome_db);
rhizome_db=NULL;
WHY(query);
WHY(sqlite3_errmsg(rhizome_db));
return WHY("Could not prepare sql statement.");
}
while(((r->buffer_length+r->source_record_size)<r->buffer_size)
&&(sqlite3_step(statement)==SQLITE_ROW))
{
r->source_index++;
if (sqlite3_column_count(statement)!=2) {
sqlite3_finalize(statement);
return WHY("sqlite3 returned multiple columns for a single column query");
}
sqlite3_blob *blob;
const unsigned char *value;
int column_type=sqlite3_column_type(statement, 0);
switch(column_type) {
case SQLITE_TEXT: value=sqlite3_column_text(statement, 0); break;
case SQLITE_BLOB:
WHYF("table='%s',col='%s',rowid=%lld",
r->blob_table,r->blob_column,
sqlite3_column_int64(statement,1));
if (sqlite3_blob_open(rhizome_db,"main",r->blob_table,r->blob_column,
sqlite3_column_int64(statement,1) /* rowid */,
0 /* read only */,&blob)!=SQLITE_OK)
{
WHY("Couldn't open blob");
continue;
}
if (sqlite3_blob_read(blob,&blob_value[0],
/* copy number of bytes based on whether we need to
de-hex the string or not */
r->source_record_size*(1+(r->source_flags&1)),0)
!=SQLITE_OK) {
WHY("Couldn't read from blob");
sqlite3_blob_close(blob);
continue;
}
WHY("Did read blob");
value=blob_value;
sqlite3_blob_close(blob);
break;
default:
/* improper column type, so don't include in report */
WHY("Bad column type");
WHYF("colunnt_type=%d",column_type);
continue;
}
if (r->source_flags&1) {
/* hex string to be converted */
int i;
for(i=0;i<r->source_record_size;i++)
/* convert the two nybls and make a byte */
r->buffer[r->buffer_length+i]
=(chartonybl(value[i<<1])<<4)|chartonybl(value[(i<<1)+1]);
} else
/* direct binary value */
bcopy(value,&r->buffer[r->buffer_length],r->source_record_size);
r->buffer_length+=r->source_record_size;
WHYF("wrote row %lld, buffer_length=%d",
r->source_index,r->buffer_length);
}
sqlite3_finalize(statement);
return 0;
}
int rhizome_server_parse_http_request(int rn,rhizome_http_request *r)
{
char id[1024];
/* Switching to writing, so update the call-back */
fd_watch(r->socket,rhizome_client_poll,POLL_OUT);
/* Clear request type flags */
r->request_type=0;
if (strlen(r->request)<1024) {
if (!strncasecmp(r->request,"GET /favicon.ico HTTP/1.",
strlen("GET /favicon.ico HTTP/1.")))
{
r->request_type=RHIZOME_HTTP_REQUEST_FAVICON;
rhizome_server_http_response_header(r,200,"image/vnd.microsoft.icon",
favicon_len);
}
else if (!strncasecmp(r->request,"GET /rhizome/groups HTTP/1.",
strlen("GET /rhizome/groups HTTP/1.")))
{
/* Return the list of known groups */
WHYF("get /rhizome/groups (list of groups)");
rhizome_server_sql_query_http_response(rn,r,"id","groups","from groups",32,1);
}
else if (!strncasecmp(r->request,"GET /rhizome/files HTTP/1.",
strlen("GET /rhizome/files HTTP/1.")))
{
/* Return the list of known files */
WHYF("get /rhizome/files (list of files)");
rhizome_server_sql_query_http_response(rn,r,"id","files","from files",32,1);
}
else if (!strncasecmp(r->request,"GET /rhizome/bars HTTP/1.",
strlen("GET /rhizome/bars HTTP/1.")))
{
/* Return the list of known files */
WHYF("get /rhizome/bars (list of BARs)");
rhizome_server_sql_query_http_response(rn,r,"bar","manifests","from manifests",32,0);
}
else if (sscanf(r->request,"GET /rhizome/file/%s HTTP/1.", id)==1)
{
/* Stream the specified file */
int dud=0;
int i;
hexFilter(id);
WHYF("get /rhizome/file/ [%s]",id);
WHY("Check for range: header, and return 206 if returning partial content");
for(i=0;i<strlen(id);i++) if (!isxdigit(id[i])) dud++;
if (dud) rhizome_server_simple_http_response(r,400,"<html><h1>That doesn't look like hex to me.</h1></html>\r\n");
else {
str_toupper_inplace(id);
long long rowid = -1;
sqlite_exec_int64(&rowid, "select rowid from files where id='%s';", id);
sqlite3_blob *blob;
if (rowid>=0)
if (sqlite3_blob_open(rhizome_db,"main","files","data",rowid,0,&blob) !=SQLITE_OK)
rowid=-1;
if (rowid<0) {
rhizome_server_simple_http_response(r,404,"<html><h1>Sorry, can't find that here.</h1></html>\r\n");
WHY("File not found / blob not opened");
}
else {
r->blob_table=strdup("files");
r->blob_column=strdup("data");
r->blob_rowid=rowid;
r->source_index=0;
r->blob_end=sqlite3_blob_bytes(blob);
rhizome_server_http_response_header(r,200,"application/binary",
r->blob_end-r->source_index);
r->request_type|=RHIZOME_HTTP_REQUEST_BLOB;
sqlite3_blob_close(blob);
WHY("opened blob and file -- but still need to send file body.");
}
}
}
else if (sscanf(r->request,"GET /rhizome/manifest/%s HTTP/1.", id)==1)
{
/* Stream the specified manifest */
hexFilter(id);
WHYF("get /rhizome/manifest/ [%s]",id);
rhizome_server_simple_http_response(r,400,"<html><h1>A specific manifest</h1></html>\r\n");
}
else
rhizome_server_simple_http_response(r,400,"<html><h1>Sorry, couldn't parse your request.</h1></html>\r\n");
}
else
rhizome_server_simple_http_response(r,400,"<html><h1>Sorry, your request was too long.</h1></html>\r\n");
/* Try sending data immediately. */
rhizome_server_http_send_bytes(rn,r);
return 0;
}
/* Return appropriate message for HTTP response codes, both known and unknown. */
#define A_VALUE_GREATER_THAN_FOUR (2+3)
char *httpResultString(int id) {
switch (id) {
case 200: return "OK"; break;
case 206: return "Partial Content"; break;
case 404: return "Not found"; break;
default:
case A_VALUE_GREATER_THAN_FOUR:
if (id>4) return "A suffusion of yellow";
/* The following MUST be the longest string returned by this function */
else return "THE JUDGEMENT OF KING WEN: Chun Signifies Difficulties At Outset, As Of Blade Of Grass Pushing Up Against Stone.";
}
}
int rhizome_server_simple_http_response(rhizome_http_request *r,int result, char *response)
{
if (r->buffer) free(r->buffer);
r->buffer_size=strlen(response)+strlen("HTTP/1.0 000 \r\n\r\n")+strlen(httpResultString(A_VALUE_GREATER_THAN_FOUR))+100;
r->buffer=(unsigned char *)malloc(r->buffer_size);
snprintf((char *)r->buffer,r->buffer_size,"HTTP/1.0 %03d %s\r\nContent-type: text/html\r\nContent-length: %d\r\n\r\n%s",result,httpResultString(result),(int)strlen(response),response);
r->buffer_size=strlen((char *)r->buffer)+1;
r->buffer_length=r->buffer_size-1;
r->buffer_offset=0;
r->request_type=RHIZOME_HTTP_REQUEST_FROMBUFFER;
return 0;
}
/*
return codes:
1: connection still open.
0: connection finished.
<0: an error occurred.
*/
int rhizome_server_http_send_bytes(int rn,rhizome_http_request *r)
{
sqlite3_blob *blob;
int bytes;
fcntl(r->socket,F_SETFL,fcntl(r->socket, F_GETFL, NULL)|O_NONBLOCK);
if (debug&DEBUG_RHIZOME) WHYF("Request #%d, type=0x%x\n",rn,r->request_type);
/* Flush anything out of the buffer if present, before doing any further
processing */
if (r->request_type&RHIZOME_HTTP_REQUEST_FROMBUFFER)
{
bytes=r->buffer_length-r->buffer_offset;
bytes=write(r->socket,&r->buffer[r->buffer_offset],bytes);
if (bytes>0) {
WHYF("wrote %d bytes\n",bytes);
dump("bytes written",&r->buffer[r->buffer_offset],bytes);
r->buffer_offset+=bytes;
if (r->buffer_offset>=r->buffer_length) {
/* Our work is done. close socket and go home */
r->request_type&=~RHIZOME_HTTP_REQUEST_FROMBUFFER;
r->buffer_offset=0; r->buffer_length=0;
if (!r->request_type) {
WHY("Finished sending data");
return rhizome_server_close_http_request(rn);
} else {
if (debug&DEBUG_RHIZOME) { WHYF("request type = 0x%x after sending buffer.",
r->request_type);
}
}
} else {
/* Still more stuff in the buffer, so return now */
return 1;
}
}
}
switch(r->request_type&(~RHIZOME_HTTP_REQUEST_FROMBUFFER))
{
case RHIZOME_HTTP_REQUEST_FAVICON:
if (r->buffer_size<favicon_len) {
free(r->buffer);
r->buffer_size=0;
r->buffer=malloc(favicon_len);
if (!r->buffer) r->request_type=0;
}
if (r->buffer)
{
int i;
for(i=0;i<favicon_len;i++)
r->buffer[i]=favicon_bytes[i];
r->buffer_length=i;
printf("buffer_length for favicon is %d\n",r->buffer_length);
r->request_type=RHIZOME_HTTP_REQUEST_FROMBUFFER;
}
break;
case RHIZOME_HTTP_REQUEST_BLOB:
/* Get more data from the file and put it in the buffer */
r->buffer_length=r->blob_end-r->source_index;
if (r->buffer_length<=0) {
/* end of blob reached */
r->request_type=0; break;
}
if (r->buffer_size<65536) {
free(r->buffer); r->buffer=malloc(65536);
if (!r->buffer) {
if (debug&DEBUG_RHIZOME) WHY("malloc() failed");
r->request_type=0; break;
}
r->buffer_size=65536;
}
if (r->buffer_length>r->buffer_size) r->buffer_length=r->buffer_size;
if (sqlite3_blob_open(rhizome_db,"main",r->blob_table,r->blob_column,
r->blob_rowid,0,&blob)==SQLITE_OK)
{
if(sqlite3_blob_read(blob,&r->buffer[0],r->buffer_length,r->source_index)
==SQLITE_OK)
{
r->request_type|=RHIZOME_HTTP_REQUEST_FROMBUFFER;
r->source_index+=r->buffer_length;
}
else
r->request_type=0;
sqlite3_blob_close(blob);
}
else
{
if (debug&DEBUG_RHIZOME) WHY("could not open blob to send more data");
r->request_type=0;
}
break;
case RHIZOME_HTTP_REQUEST_FROMBUFFER:
/* This really shouldn't happen! */
return WHY("Something impossible happened.");
break;
default:
WHY("sending data from this type of HTTP request not implemented");
break;
}
if (!r->request_type) return rhizome_server_close_http_request(rn);
fcntl(r->socket,F_SETFL,fcntl(r->socket, F_GETFL, NULL)&(~O_NONBLOCK));
return 1;
}
int rhizome_server_http_response_header(rhizome_http_request *r,int result,
char *mime_type,unsigned long long bytes)
{
if (!r->buffer) {
r->buffer_size=bytes+strlen("HTTP/1.0 000 \r\n\r\n")+strlen(httpResultString(A_VALUE_GREATER_THAN_FOUR))+100;
r->buffer=(unsigned char *)malloc(r->buffer_size);
}
snprintf((char *)r->buffer,r->buffer_size,"HTTP/1.0 %03d \r\nContent-type: %s\r\nContent-length: %lld\r\n\r\n",result,mime_type,bytes);
r->buffer_length=strlen((char *)r->buffer);
r->buffer_offset=0;
r->request_type|=RHIZOME_HTTP_REQUEST_FROMBUFFER;
return 0;
}
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