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|
/*
This file is part of libmicrohttpd
(C) 2007 Daniel Pittman
libmicrohttpd 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, or (at your
option) any later version.
libmicrohttpd 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 libmicrohttpd; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file daemon.c
* @brief This is my implementation of the libmicrohttpd interface. Many features incomplete at this time.
* @author Daniel Pittman
* @version 0.1.0
*/
#include "config.h"
#include "microhttpd.h"
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>
#define MHD_MAX_CONNECTIONS FD_SETSIZE -4
#define MHD_MAX_BUF_SIZE 2048
#define MHD_MAX_HEADERS 1024
#define MHD_MAX_HANDLERS 1024
#define MHD_MAX_RESPONSE 1024
int MHD_handle_read(int, struct MHD_Daemon *);
int MHD_handle_write(int, struct MHD_Daemon *);
void * MHD_spawn_connections(void * data);
void * MHD_select(void * data);
int MHD_parse_message(struct MHD_Session * session);
void MHD_parse_URL(struct MHD_Session * session);
struct MHD_Daemon {
unsigned int options;
unsigned short port;
int socket_fd;
int max_fd;
MHD_AcceptPolicyCallback apc;
void * apc_cls;
fd_set read_fd_set;
fd_set write_fd_set;
fd_set except_fd_set;
int shutdown;
pthread_t pid;
struct MHD_Session * connections[MHD_MAX_CONNECTIONS];
int firstFreeHandler;
struct MHD_Access_Handler * handlers[MHD_MAX_HANDLERS];
MHD_AccessHandlerCallback dh;
void * dh_cls;
};
struct MHD_Session {
struct sockaddr_in addr;
int readLoc;
int writeLoc;
int id;
int socket_fd;
pthread_t pid;
struct MHD_Daemon * daemon;
int bufPos;
int messagePos;
char inbuf[MHD_MAX_BUF_SIZE];
int firstFreeHeader;
char * requestType;
char * documentName;
struct MHD_HTTP_Header * headers[MHD_MAX_HEADERS];
unsigned short responsePending;
int currentResponse;
struct MHD_Response * currentResponses[MHD_MAX_RESPONSE];
};
struct MHD_Response {
pthread_mutex_t mutex;
unsigned int responseCode;
int freeWhenFinished;
unsigned int headersSent;
size_t size;
void * data;
int bytesSentSoFar;
int must_free;
MHD_ContentReaderCallback crc;
void * crc_cls;
MHD_ContentReaderFreeCallback crfc;
int firstFreeHeader;
struct MHD_HTTP_Header * headers[MHD_MAX_HEADERS];
struct MHD_Session * currentSession;
};
struct MHD_Access_Handler {
char * uri_prefix;
MHD_AccessHandlerCallback dh;
void * dh_cls;
};
struct MHD_HTTP_Header {
char * header;
char * headerContent;
enum MHD_ValueKind kind;
};
/**
* Add a header line to the response.
*
* @return MHD_NO on error (i.e. invalid header or content format).
*/
int
MHD_add_response_header(struct MHD_Response * response,
const char * header,
const char * content) {
//Note that as of this time this function will also return
//an error if the maximum number of headers allowed is exceeded.
char * saveptr;
char * newHeader;
char * newContent;
int i;
if(response == NULL || header == NULL || content == NULL || strlen(header) == 0 || strlen(content) == 0) {
return MHD_NO;
}
if(response->firstFreeHeader >= MHD_MAX_HEADERS) {
return MHD_NO;
}
newHeader = (char *)malloc(strlen(header)+1);
newContent = (char *)malloc(strlen(content)+1);
if(newHeader == NULL || newContent == NULL) {
fprintf(stderr, "Error allocating memory!\n");
return MHD_NO;
}
sprintf(newHeader, "%s", header);
sprintf(newContent, "%s", content);
if(strtok_r(newHeader, " \t\r\n", &saveptr) != NULL) {
fprintf(stderr, "Malformed header!\n");
free(newContent);
free(newHeader);
return MHD_NO;
}
if(strtok_r(newContent, "\n", &saveptr) != NULL) {
fprintf(stderr, "Malformed content!\n");
free(newContent);
free(newHeader);
return MHD_NO;
}
struct MHD_HTTP_Header * newHTTPHeader = (struct MHD_HTTP_Header *)malloc(sizeof(struct MHD_HTTP_Header));
if(newHTTPHeader == NULL) {
fprintf(stderr, "Error allocating memory!\n");
free(newContent);
free(newHeader);
return MHD_NO;
}
response->headers[response->firstFreeHeader]->header = newHeader;
response->headers[response->firstFreeHeader]->headerContent = newContent;
//For now, everything is a HTTP Header... this needs to be improved!
response->headers[response->firstFreeHeader]->kind = MHD_HEADER_KIND;
response->firstFreeHeader=MHD_MAX_HEADERS;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(response->headers[i] == NULL) {
response->firstFreeHeader = i;
break;
}
}
return MHD_YES;
}
/**
* This function accepts an incoming connection
* and creates the MHD_Session object for it.
* It also enforces policy by way of calling the accept policy callback
*/
int
MHD_create_connection(struct MHD_Daemon * daemon) {
int i, first_free, size;
if(daemon == NULL)
return -1;
first_free = -1;
for(i = 0; i < MHD_MAX_CONNECTIONS; i++) {
if(daemon->connections[i] == NULL) {
first_free = i;
break;
}
}
if(first_free == -1)
return -1;
daemon->connections[first_free] = (struct MHD_Session *)malloc(sizeof(struct MHD_Session));
if(daemon->connections[first_free] == NULL) {
if((daemon->options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "Error allocating memory!\n");
return -1;
}
size = sizeof(struct sockaddr);
daemon->connections[first_free]->socket_fd =
accept(daemon->socket_fd, (struct sockaddr *)&daemon->connections[first_free]->addr,
(socklen_t *)&size);
if(daemon->connections[first_free]->socket_fd == -1) {
free(daemon->connections[first_free]);
daemon->connections[first_free] = NULL;
if((daemon->options & MHD_USE_DEBUG) != 0) {
fprintf(stderr, "Error accepting incoming connections!\n");
}
return -1;
}
if(daemon->apc != NULL && daemon->apc(daemon->apc_cls, (const struct sockaddr *)&daemon->connections[first_free]->addr, (socklen_t)sizeof(struct sockaddr_in))==MHD_NO) {
close(daemon->connections[first_free]->socket_fd);
free(daemon->connections[first_free]);
daemon->connections[first_free] = NULL;
if((daemon->options & MHD_USE_DEBUG) != 0) {
fprintf(stderr, "Connection denied based on accept policy callback!\n");
}
return -1;
}
daemon->connections[first_free]->id = first_free;
daemon->connections[first_free]->daemon = daemon;
daemon->connections[first_free]->pid = (pthread_t)-1;
daemon->connections[first_free]->bufPos = 0;
daemon->connections[first_free]->messagePos= 0;
daemon->connections[first_free]->responsePending = 0;
memset(daemon->connections[first_free]->inbuf, '\0', MHD_MAX_BUF_SIZE);
daemon->connections[first_free]->currentResponse = 0;
daemon->connections[first_free]->firstFreeHeader = 0;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
daemon->connections[first_free]->headers[i] = NULL;
}
for(i = 0; i < MHD_MAX_RESPONSE; i++) {
daemon->connections[first_free]->currentResponses[i] = NULL;
}
if(daemon->max_fd < daemon->connections[first_free]->socket_fd) {
daemon->max_fd = daemon->connections[first_free]->socket_fd;
}
return first_free;
}
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response, -1 for unknown
* @param crc callback to use to obtain response data
* @param crc_cls extra argument to crc
* @param crfc callback to call to free crc_cls resources
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *
MHD_create_response_from_callback(size_t size,
MHD_ContentReaderCallback crc,
void * crc_cls,
MHD_ContentReaderFreeCallback crfc) {
struct MHD_Response * retVal;
int i;
if(crc == NULL) {
fprintf(stderr, "A ContentReaderCallback must be provided to MHD_create_response_from_callback!\n");
return NULL;
}
retVal = (struct MHD_Response *) malloc(sizeof(struct MHD_Response));
if(retVal == NULL) {
fprintf(stderr, "Error allocating memory!\n");
return NULL;
}
retVal->size = size;
retVal->crc = crc;
retVal->crc_cls = crc_cls;
retVal->crfc = crfc;
retVal->firstFreeHeader = 0;
retVal->responseCode = 0;
retVal->headersSent = 0;
retVal->bytesSentSoFar = 0;
retVal->freeWhenFinished = 0;
retVal->currentSession = NULL;
if(pthread_mutex_init(&retVal->mutex, NULL) != 0) {
fprintf(stderr, "Error initializing mutex!\n");
free(retVal);
return NULL;
}
for(i = 0; i < MHD_MAX_HEADERS; i++) {
retVal->headers[i] = NULL;
}
retVal->data = NULL;
retVal->must_free = 0;
return retVal;
}
/**
* Create a response object. The response object can be extended with
* header information and then be used any number of times.
*
* @param size size of the data portion of the response
* @param data the data itself
* @param must_free libmicrohttpd should free data when done
* @param must_copy libmicrohttpd must make a copy of data
* right away, the data maybe released anytime after
* this call returns
* @return NULL on error (i.e. invalid arguments, out of memory)
*/
struct MHD_Response *
MHD_create_response_from_data(size_t size,
void * data,
int must_free,
int must_copy) {
struct MHD_Response * retVal;
int i;
if(data == NULL) {
fprintf(stderr, "data must be provided to MHD_Create_response_from_data!\n");
return NULL;
}
retVal = (struct MHD_Response *) malloc(sizeof(struct MHD_Response));
if(retVal == NULL) {
fprintf(stderr, "Error allocating memory!\n");
return NULL;
}
retVal->size = size;
retVal->crc = NULL;
retVal->crc_cls = NULL;
retVal->crfc = NULL;
retVal->responseCode = 0;
retVal->firstFreeHeader = 0;
retVal->freeWhenFinished = 0;
retVal->currentSession = NULL;
retVal->headersSent = 0;
retVal->bytesSentSoFar = 0;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
retVal->headers[i] = NULL;
}
if(pthread_mutex_init(&retVal->mutex, NULL) != 0) {
fprintf(stderr, "Error initializing mutex!\n");
free(retVal);
return NULL;
}
if(must_copy) {
retVal->data = malloc(size);
if(retVal->data == NULL) {
fprintf(stderr, "Error allocating memory!\n");
free(retVal);
return NULL;
}
memcpy(retVal->data, data, size);
retVal->must_free = 1;
} else {
retVal->data = data;
retVal->must_free = must_free;
}
return retVal;
}
/**
* Delete a header line from the response.
*
* @return MHD_NO on error (no such header known)
*/
int
MHD_del_response_header(struct MHD_Response * response,
const char * header,
const char * content) {
int i;
if(header == NULL || content == NULL) {
return MHD_NO;
}
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(response->headers[i] != NULL &&
strncmp(header, response->headers[i]->header, strlen(header)) == 0 &&
strncmp(content, response->headers[i]->headerContent, strlen(header)) == 0) {
free(response->headers[i]->header);
free(response->headers[i]->headerContent);
free(response->headers[i]);
response->headers[i] = NULL;
return MHD_YES;
}
}
return MHD_NO;
}
/**
* Destroy a response object and associated resources. Note that
* libmicrohttpd may keep some of the resources around if the response
* is still in the queue for some clients, so the memory may not
* necessarily be freed immediatley.
*/
void
MHD_destroy_response(struct MHD_Response * response) {
int i;
if(response == NULL) {
return;
}
pthread_mutex_lock(&response->mutex);
if(response->currentSession != NULL) {
response->freeWhenFinished = 1;
pthread_mutex_unlock(&response->mutex);
return;
}
if(response->must_free && response->data != NULL) {
free(response->data);
}
if(response->crfc != NULL && response->crc_cls != NULL) {
response->crfc(response->crc_cls);
}
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(response->headers[i] == NULL)
continue;
free(response->headers[i]->header);
free(response->headers[i]->headerContent);
free(response->headers[i]);
}
pthread_mutex_unlock(&response->mutex);
pthread_mutex_destroy(&response->mutex);
free(response);
}
/**
* Thi function is similar to destroy_response except
* that it was created to destroy the session object.
*/
void
MHD_destroy_session(struct MHD_Session * session) {
int i;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(session->headers[i] != NULL) {
free(session->headers[i]);
}
}
for(i = 0; i < MHD_MAX_RESPONSE; i++) {
if(session->currentResponses[i] != NULL) {
pthread_mutex_lock(&session->currentResponses[i]->mutex);
session->currentResponses[i]->currentSession = NULL;
pthread_mutex_unlock(&session->currentResponses[i]->mutex);
}
}
close(session->socket_fd);
free(session);
}
/**
* Obtain the select sets for this daemon.
*
* @return MHD_YES on success, MHD_NO if this
* daemon was not started with the right
* options for this call.
*/
int
MHD_get_fdset(struct MHD_Daemon * daemon,
fd_set * read_fd_set,
fd_set * write_fd_set,
fd_set * except_fd_set,
int * max_fd) {
int i;
if(daemon == NULL || read_fd_set == NULL || write_fd_set == NULL || except_fd_set == NULL || max_fd == NULL) {
return MHD_NO;
}
if((daemon->options & MHD_USE_THREAD_PER_CONNECTION) != 0) {
return MHD_NO;
}
FD_ZERO(read_fd_set);
FD_ZERO(write_fd_set);
FD_ZERO(except_fd_set);
FD_SET(daemon->socket_fd, &daemon->read_fd_set);
for(i = 0; i < MHD_MAX_CONNECTIONS; i++) {
if(daemon->connections[i] != NULL) {
FD_SET(daemon->connections[i]->socket_fd, read_fd_set);
FD_SET(daemon->connections[i]->socket_fd, write_fd_set);
}
}
*max_fd = daemon->max_fd;
return MHD_YES;
}
/**
* Get all of the headers added to a response.
*
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to iterator
* @return number of entries iterated over
*/
int
MHD_get_response_headers(struct MHD_Response * response,
MHD_KeyValueIterator * iterator,
void * iterator_cls) {
int i, numHeaders;
if(response == NULL) {
return -1;
}
numHeaders = 0;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(response->headers[i] != NULL) {
if(iterator != NULL) {
(*iterator)(iterator_cls, response->headers[i]->kind, response->headers[i]->header, response->headers[i]->headerContent);
}
numHeaders++;
}
}
return numHeaders;
}
/**
* Get all of the headers from the request.
*
* @param iterator callback to call on each header;
* maybe NULL (then just count headers)
* @param iterator_cls extra argument to iterator
* @return number of entries iterated over
*/
int
MHD_get_session_values(struct MHD_Session * session,
enum MHD_ValueKind kind,
MHD_KeyValueIterator * iterator,
void * iterator_cls) {
int i, numHeaders;
if(session == NULL) {
return -1;
}
numHeaders = 0;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(session->headers[i] != NULL && session->headers[i]->kind == kind) {
if(iterator != NULL) {
(*iterator)(iterator_cls, session->headers[i]->kind, session->headers[i]->header, session->headers[i]->headerContent);
}
numHeaders++;
}
}
return numHeaders;
}
/**
* This function is intented to be called in the case of
* multithreaded connections. A thread will be spawned calling this
* function with a particular connection, and the thread will poll the connection
* (this should be improved) until there is something to do
*/
void *
MHD_handle_connection(void * data) {
struct MHD_Session * con;
int num_ready;
struct timeval timeout;
fd_set read;
fd_set write;
con = data;
if(con == NULL)
return NULL;
do {
FD_ZERO(&read);
FD_ZERO(&write);
FD_SET(con->socket_fd, &read);
FD_SET(con->socket_fd, &write);
timeout.tv_sec = 0;
timeout.tv_usec = 0;
num_ready = select(con->socket_fd + 1,
&read, &write, NULL, &timeout);
if(num_ready > 0) {
if(FD_ISSET(con->socket_fd, &read)) {
if(MHD_handle_read(con->id, con->daemon) == MHD_NO) {
pthread_detach(pthread_self());
return NULL;
}
}
if (FD_ISSET(con->socket_fd, &write)) {
if(MHD_handle_write(con->id, con->daemon) == MHD_NO) {
pthread_detach(pthread_self());
return NULL;
}
}
}
} while (!con->daemon->shutdown);
return NULL;
}
/**
* This function is created to handle the except file descriptor
* set, but it is doubtfull that it will ever be used.
*/
void
MHD_handle_except(int connection_id, struct MHD_Daemon * daemon) {
//It is unlikely that this function will ever need to be implemented.
}
/**
* This function handles a particular connection when it has been
* determined that there is data to be read off a socket. All implementations
* (multithreaded, external select, internal select) call this function
* to handle reads.
*/
int
MHD_handle_read(int connection_id, struct MHD_Daemon * daemon) {
int bytes_read,i;
if((daemon->options & MHD_USE_DEBUG) != 0) {
fprintf(stderr, "Enter MHD_handle_read\n");
}
if(daemon == NULL || daemon->connections[connection_id]==NULL) {
return MHD_NO;
}
if(daemon->connections[connection_id]->responsePending) {
return MHD_YES;
}
daemon->connections[connection_id]->firstFreeHeader = 0;
daemon->connections[connection_id]->requestType = NULL;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
daemon->connections[connection_id]->headers[i] = NULL;
}
memmove(daemon->connections[connection_id]->inbuf, daemon->connections[connection_id]->inbuf+daemon->connections[connection_id]->messagePos, daemon->connections[connection_id]->bufPos - daemon->connections[connection_id]->messagePos);
memset(daemon->connections[connection_id]->inbuf + daemon->connections[connection_id]->bufPos - daemon->connections[connection_id]->messagePos,
0, MHD_MAX_BUF_SIZE - daemon->connections[connection_id]->bufPos + (daemon->connections[connection_id]->bufPos - daemon->connections[connection_id]->messagePos));
bytes_read = recv(daemon->connections[connection_id]->socket_fd,
daemon->connections[connection_id]->inbuf + daemon->connections[connection_id]->bufPos - daemon->connections[connection_id]->messagePos,
MHD_MAX_BUF_SIZE - (daemon->connections[connection_id]->bufPos - daemon->connections[connection_id]->messagePos), 0);
daemon->connections[connection_id]->bufPos = bytes_read + daemon->connections[connection_id]->bufPos - daemon->connections[connection_id]->messagePos;
if(bytes_read == 0) {
MHD_destroy_session(daemon->connections[connection_id]);
daemon->connections[connection_id] = NULL;
return MHD_NO;
} else {
fprintf(stderr, "\"%s\"\n", daemon->connections[connection_id]->inbuf);
i = MHD_parse_message(daemon->connections[connection_id]);
if(i == -1) {
daemon->connections[connection_id]->messagePos = daemon->connections[connection_id]->bufPos;
return MHD_YES;
} else {
daemon->connections[connection_id]->messagePos = i;
fprintf(stderr, "Number of bytes in header: %i\n", daemon->connections[connection_id]->messagePos);
}
daemon->connections[connection_id]->responsePending = 1;
MHD_parse_URL(daemon->connections[connection_id]);
for(i = 0; i < MHD_MAX_HANDLERS; i++) {
if(daemon->handlers[i] == NULL)
continue;
//header 0 will hold the url of the request
if(strstr(daemon->connections[connection_id]->headers[0]->headerContent, daemon->handlers[i]->uri_prefix) != NULL){
return daemon->handlers[i]->dh(daemon->handlers[i]->dh_cls, daemon->connections[connection_id],
daemon->connections[connection_id]->documentName, daemon->connections[connection_id]->requestType, NULL, NULL);
}
}
return daemon->dh(daemon->dh_cls, daemon->connections[connection_id],
daemon->connections[connection_id]->documentName, daemon->connections[connection_id]->requestType, NULL, NULL);
}
return MHD_YES;
}
/**
* This function was created to handle writes to sockets when it has been
* determined that the socket can be written to. If there is no data
* to be written, however, the function call does nothing. All implementations
* (multithreaded, external select, internal select) call this function
*/
int
MHD_handle_write(int connection_id, struct MHD_Daemon * daemon) {
struct MHD_Session * session;
struct MHD_Response * response;
int i;
char * buffer[2048];
char * responseMessage;
int numBytesInMessage;
if((daemon->options & MHD_USE_DEBUG) != 0) {
fprintf(stderr, "Enter MHD_handle_write\n");
}
session = daemon->connections[connection_id];
response = session->currentResponses[session->currentResponse];
numBytesInMessage = 25;
responseMessage = malloc(25);
if(responseMessage == NULL) {
if(daemon->options & MHD_USE_DEBUG)
fprintf(stderr, "Error allocating memory!\n");
return MHD_NO;
}
if(response == NULL)
return MHD_NO;
pthread_mutex_lock(&response->mutex);
if(!response->headersSent) {
sprintf(responseMessage, "HTTP/1.1 %i Go to hell!\r\n", response->responseCode);
fprintf(stderr, "%s\n", responseMessage);
if(send(session->socket_fd, responseMessage, strlen(responseMessage), 0) != strlen(responseMessage)) {
fprintf(stderr, "Error! could not send an entire header in one call to send! unable to handle this case as of this time.\n");
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(response->headers[i] == NULL)
continue;
if(strlen(response->headers[i]->header) + strlen(response->headers[i]->headerContent) + 5 > numBytesInMessage) {
free(responseMessage);
responseMessage = malloc(strlen(response->headers[i]->header) + strlen(response->headers[i]->headerContent) + 5);
if(responseMessage == NULL) {
if(daemon->options & MHD_USE_DEBUG)
fprintf(stderr, "Error allocating memory!\n");
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
numBytesInMessage = strlen(response->headers[i]->header) + strlen(response->headers[i]->headerContent) + 5;
}
sprintf(responseMessage, "%s: %s\r\n", response->headers[i]->header, response->headers[i]->headerContent);
fprintf(stderr, "%s\n", responseMessage);
if(send(session->socket_fd, responseMessage, strlen(responseMessage), 0) != strlen(responseMessage)) {
fprintf(stderr, "Error! could not send an entire header in one call to send! unable to handle this case as of this time.\n");
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
}
response->headersSent = 1;
}
if(response->data != NULL) {
if(response->bytesSentSoFar == 0) {
if(numBytesInMessage < 32) {
free(responseMessage);
responseMessage = malloc(32);
if(responseMessage == NULL) {
if(daemon->options & MHD_USE_DEBUG)
fprintf(stderr, "Error allocating memory!\n");
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
}
sprintf(responseMessage, "Content-length: %i\r\n\r\n", response->size);
fprintf(stderr, "%s\n", responseMessage);
if(send(session->socket_fd, responseMessage, strlen(responseMessage),0)!= strlen(responseMessage)) {
fprintf(stderr, "Error! could not send an entire header in one call to send! unable to handle this case as of this time.\n");
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
}
i = send(session->socket_fd, response->data+response->bytesSentSoFar, response->size-response->bytesSentSoFar,0);
response->bytesSentSoFar += i;
fprintf(stderr, "Sent %i bytes of data\nTotal to send is %i bytes\n", i, response->size);
if(response->bytesSentSoFar == response->size) {
session->currentResponses[session->currentResponse] = NULL;
session->currentResponse = (session->currentResponse + 1) % MHD_MAX_RESPONSE;
response->currentSession = NULL;
if(response->freeWhenFinished) {
pthread_mutex_unlock(&response->mutex);
MHD_destroy_response(response);
}
/*THIS NEEDS TO BE HANDLED ANOTHER WAY!!! TIMEOUT, ect..., as of now this is the only way to get test case to work
* since client never disconnects on their own!
*/
if(session->currentResponses[session->currentResponse] == NULL) {
MHD_destroy_session(session);
daemon->connections[connection_id] = NULL;
return MHD_NO;
}
}
} else {
if(response->crc == NULL) {
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
if(response->bytesSentSoFar == 0) {
if(send(session->socket_fd, "\r\n", response->size,0) != 2) {
fprintf(stderr, "Error! could not send an entire header in one call to send! unable to handle this case as of this time.\n");
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
}
memset(buffer, 0, 2048);
i = response->crc(response->crc_cls, response->bytesSentSoFar, (char *)buffer, 2048);
if(i == -1) {
pthread_mutex_unlock(&response->mutex);
session->currentResponses[session->currentResponse] = NULL;
session->currentResponse = (session->currentResponse + 1) % MHD_MAX_RESPONSE;
response->currentSession = NULL;
if(response->freeWhenFinished) {
pthread_mutex_unlock(&response->mutex);
MHD_destroy_response(response);
}
/*THIS NEEDS TO BE HANDLED ANOTHER WAY!!! TIMEOUT, ect..., as of now this is the only way to get test case to work
* since client never disconnects on their own!
*/
if(session->currentResponses[session->currentResponse] == NULL) {
MHD_destroy_session(session);
daemon->connections[connection_id] = NULL;
return MHD_NO;
}
} else {
i = send(session->socket_fd, buffer, i,0);
response->bytesSentSoFar += i;
}
}
pthread_mutex_unlock(&response->mutex);
return MHD_YES;
}
/**
* Get a particular header value. If multiple
* values match the kind, return any one of them.
*
* @param key the header to look for
* @return NULL if no such item was found
*/
const char *
MHD_lookup_session_value(struct MHD_Session * session,
enum MHD_ValueKind kind,
const char * key) {
int i;
for(i = 0; i < MHD_MAX_HEADERS; i++) {
if(session->headers[i] != NULL &&
session->headers[i]->kind == kind &&
strncmp(session->headers[i]->header, key, strlen(session->headers[i]->header)) == 0) {
return (const char *)session->headers[i]->headerContent;
}
}
return NULL;
}
/**
* This function is designed to parse the input buffer of a given session.
* It is assumed that the data being parsed originates at buffer location
* 0 (a valid assumption since the buffer is shifted after each message)
*/
int
MHD_parse_message(struct MHD_Session * session) {
const char * crlfcrlf = "\r\n\r\n";
const char * crlf = "\r\n";
char * saveptr;
char * saveptr1;
struct MHD_HTTP_Header * newHeader;
char * curTok;
char * curTok1;
int numBytes;
curTok = strstr(session->inbuf, crlfcrlf);
if(curTok == NULL) {
return -1;
}
memset(curTok+2, 0, 2);
numBytes = strlen(session->inbuf) + 2;
curTok = strtok_r(session->inbuf, crlf, &saveptr);
session->requestType = strtok_r(curTok, " ", &saveptr1);
newHeader = (struct MHD_HTTP_Header *)malloc(sizeof(struct MHD_HTTP_Header));
if(newHeader == NULL) {
if(session->daemon->options & MHD_USE_DEBUG)
fprintf(stderr, "Error allocating memory!\n");
return -1;
}
newHeader->kind = MHD_GET_ARGUMENT_KIND;
newHeader->header = session->requestType;
newHeader->headerContent = strtok_r(NULL, " ", &saveptr1);
session->headers[session->firstFreeHeader++] = newHeader;
curTok = strtok_r(NULL, crlf, &saveptr);
while(curTok != NULL && session->firstFreeHeader < MHD_MAX_HEADERS) {
curTok1 = strtok_r(curTok, ":", &saveptr1);
newHeader = (struct MHD_HTTP_Header *)malloc(sizeof(struct MHD_HTTP_Header));
if(newHeader == NULL) {
if(session->daemon->options & MHD_USE_DEBUG)
fprintf(stderr, "Error allocating memory!\n");
return -1;
}
newHeader->header = curTok1;
newHeader->headerContent = curTok + strlen(curTok1) + 2;
//For now, everything is a get!
newHeader->kind = MHD_GET_ARGUMENT_KIND;
session->headers[session->firstFreeHeader++] = newHeader;
curTok = strtok_r(NULL, crlf, &saveptr);
}
return numBytes;
}
/**
* This function needs to do a lot more (i.e. break up get arguments)
* but for now just seperates the prefix of the url from the document
* portion.
*/
void
MHD_parse_URL(struct MHD_Session * session) {
char * working;
int pos,i;
working = session->headers[0]->headerContent;
pos = 0;
for(i = 0; i < strlen(working); i++) {
if(working[i] == '/')
pos = i+1;
}
if(pos >= strlen(working))
pos = 0;
session->documentName = session->headers[0]->headerContent+pos;
}
/**
* Queue a response to be transmitted to the client (as soon as
* possible).
*
* @param session the session identifying the client
* @param status_code HTTP status code (i.e. 200 for OK)
* @param response response to transmit
* @return MHD_NO on error (i.e. reply already sent),
* MHD_YES on success or if message has been queued
*/
int
MHD_queue_response(struct MHD_Session * session,
unsigned int status_code,
struct MHD_Response * response) {
//As of now this function can only support a fixed amount of queued responses, and will
//return MHD_NO if that queue is full
int index;
if(session == NULL || response == NULL) {
return MHD_NO;
}
pthread_mutex_lock(&response->mutex);
if(response->currentSession != NULL) {
return MHD_NO;
}
if(session->currentResponses[session->currentResponse] == NULL) {
index = session->currentResponse;
} else if(session->currentResponses[session->currentResponse + 1 % MHD_MAX_RESPONSE] == NULL) {
index = session->currentResponse + 1 % MHD_MAX_RESPONSE;
} else {
pthread_mutex_unlock(&response->mutex);
return MHD_NO;
}
response->responseCode = status_code;
session->currentResponses[index] = response;
response->currentSession = session;
session->responsePending = 0;
pthread_mutex_unlock(&response->mutex);
return MHD_YES;
}
/**
* @return -1 if no data uploaded; otherwise number of bytes
* read into buf; 0 for end of transmission
* Specification not complete at this time.
*/
int
MHD_read_file_upload(struct MHD_Session * session,
void * buf,
size_t len) {
//This function will not be implemented until the specification is completed.
return -1;
}
/**
* Run webserver operations (without blocking unless
* in client callbacks). This method should be called
* by clients in combination with MHD_get_fdset
* if the client-controlled select method is used.
*
* @return MHD_YES on success, MHD_NO if this
* daemon was not started with the right
* options for this call.
*/
int
MHD_run(struct MHD_Daemon * daemon) {
if((daemon->options & MHD_USE_THREAD_PER_CONNECTION) != 0) {
daemon->shutdown = 0;
if(pthread_create(&daemon->pid, NULL, (void *) &MHD_spawn_connections, (void *)daemon) == 0) {
return MHD_YES;
} else {
return MHD_NO;
}
} else if((daemon->options & MHD_USE_SELECT_INTERNALLY) != 0) {
daemon->shutdown = 0;
if(pthread_create(&daemon->pid, NULL, (void *) &MHD_select, (void *)daemon) == 0) {
return MHD_YES;
} else {
return MHD_NO;
}
} else {
daemon->shutdown = 1;
return (MHD_select((void *)daemon) == NULL);
}
}
/**
* Register an access handler for all URIs beginning with uri_prefix.
*
* @param uri_prefix
* @return MRI_NO if a handler for this exact prefix
* already exists
*/
int
MHD_register_handler(struct MHD_Daemon * daemon,
const char * uri_prefix,
MHD_AccessHandlerCallback dh,
void * dh_cls) {
int i;
//This function will also return MHD_NO if the maximum number of supported handlers is exceeded
if(daemon == NULL || uri_prefix == NULL || dh == NULL) {
return MHD_NO;
}
if(daemon->firstFreeHandler >= MHD_MAX_HANDLERS) {
return MHD_NO;
}
daemon->handlers[daemon->firstFreeHandler] = malloc(sizeof(struct MHD_Access_Handler));
if(daemon->handlers[daemon->firstFreeHandler] == NULL) {
if((daemon->options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "Error allocating memory!\n");
return MHD_NO;
}
daemon->handlers[daemon->firstFreeHandler]->uri_prefix = malloc(strlen(uri_prefix)+1);
if(daemon->handlers[daemon->firstFreeHandler]->uri_prefix == NULL) {
if((daemon->options & MHD_USE_DEBUG) != 0) {
free(daemon->handlers[daemon->firstFreeHandler]);
fprintf(stderr, "Error allocating memory!\n");
}
return MHD_NO;
}
sprintf(daemon->handlers[daemon->firstFreeHandler]->uri_prefix, "%s", uri_prefix);
daemon->handlers[daemon->firstFreeHandler]->dh = dh;
daemon->handlers[daemon->firstFreeHandler]->dh_cls = dh_cls;
daemon->firstFreeHandler = MHD_MAX_HANDLERS;
for(i = 0; i < MHD_MAX_HANDLERS; i++) {
if(daemon->handlers[i] == NULL) {
daemon->firstFreeHandler = i;
break;
}
}
return MHD_YES;
}
/**
* This function is the entry point for either internal or external select.
* The only differences between the two forms of running is whether the call is
* made from a new thread or the main thread, and whether the initial value
* of shutdown is 0 or 1 (1 for loop, 0 for one time pass)
*/
void *
MHD_select(void * data) {
struct MHD_Daemon * daemon;
int i, num_ready;
struct timeval timeout;
daemon = data;
if(daemon == NULL) {
return NULL;
}
do {
FD_ZERO(&daemon->read_fd_set);
FD_ZERO(&daemon->write_fd_set);
FD_ZERO(&daemon->except_fd_set);
FD_SET(daemon->socket_fd, &daemon->read_fd_set);
for(i = 0; i < MHD_MAX_CONNECTIONS; i++) {
if(daemon->connections[i] != NULL) {
FD_SET(daemon->connections[i]->socket_fd, &daemon->read_fd_set);
FD_SET(daemon->connections[i]->socket_fd, &daemon->write_fd_set);
}
}
timeout.tv_sec = 0;
timeout.tv_usec = 0;
num_ready = select(daemon->max_fd + 1,
&(daemon->read_fd_set), &(daemon->write_fd_set), &(daemon->except_fd_set), &timeout);
if(num_ready > 0) {
for(i = 0; i < MHD_MAX_CONNECTIONS; i++) {
if(daemon->connections[i] != NULL) {
if(FD_ISSET(daemon->connections[i]->socket_fd, &(daemon->read_fd_set))) {
if(MHD_handle_read(i, daemon) == MHD_NO)
continue;
}
if (FD_ISSET(daemon->connections[i]->socket_fd, &(daemon->write_fd_set))) {
if(MHD_handle_write(i, daemon) == MHD_NO)
continue;
}
if (FD_ISSET(daemon->connections[i]->socket_fd, &(daemon->except_fd_set))) {
MHD_handle_except(i, daemon);
}
}
}
if(FD_ISSET(daemon->socket_fd, &(daemon->read_fd_set))) {
if(MHD_create_connection(daemon) == -1) {
continue;
}
}
}
} while (!daemon->shutdown);
return NULL;
}
/**
* This function was created for the case of multithreaded connections.
* A thread will spawned to sit on this function, and in turn spawns more
* threads, one per connection.
*/
void *
MHD_spawn_connections(void * data) {
struct MHD_Daemon * daemon;
int con, num_ready;
struct timeval timeout;
fd_set read;
daemon = data;
if(daemon == NULL) {
return NULL;
}
do {
FD_ZERO(&read);
FD_SET(daemon->socket_fd, &read);
timeout.tv_sec = 0;
timeout.tv_usec = 0;
num_ready = select(daemon->socket_fd + 1,&read, NULL, NULL, &timeout);
if(num_ready > 0) {
con = MHD_create_connection(daemon);
if(con == -1)
continue;
if(pthread_create(&daemon->connections[con]->pid, NULL, (void *) &MHD_handle_connection, (void *)daemon->connections[con]) != 0) {
if((daemon->options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "Error creating connection handler!.\n");
}
}
} while (!daemon->shutdown);
return NULL;
}
/**
* Start a webserver on the given port.
* @param port port to bind to
* @param apc callback to call to check which clients
* will be allowed to connect
* @param apc_cls extra argument to apc
* @param dh default handler for all URIs
* @param dh_cls extra argument to dh
* @return NULL on error, handle to daemon on success
*/
struct MHD_Daemon *
MHD_start_daemon(unsigned int options,
unsigned short port,
MHD_AcceptPolicyCallback apc,
void * apc_cls,
MHD_AccessHandlerCallback dh,
void * dh_cls) {
struct MHD_Daemon * retVal = NULL;
int socket_fd, opt, res, i;
struct sockaddr_in servaddr;
struct hostent *hostptr;
char hostid[32];
if((options & MHD_USE_SSL) != 0) {
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "SSL at this time is unsupported.\n");
return NULL;
}
if((options & MHD_USE_IPv6) != 0) {
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "IP version 6 is not supported at this time.\n");
return NULL;
}
if((options & MHD_USE_IPv4) != 0) {
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "Enter MHD_start_daemon. Starting Daemon on port %i\n", port);
if(port < 1) {
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "Invalid port: %i!\n", port);
return NULL;
}
if(dh == NULL) {
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "A default access handler must be provided\n");
return NULL;
}
retVal = (struct MHD_Daemon *)malloc(sizeof(struct MHD_Daemon));
if(retVal == NULL) {
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "Error allocating memory!\n");
return NULL;
}
retVal->options = options;
retVal->port = port;
retVal->apc = apc;
retVal->apc_cls = apc_cls;
retVal->dh = dh;
retVal->dh_cls = dh_cls;
retVal->shutdown = 0;
retVal->pid = (pthread_t)-1;
retVal->firstFreeHandler = 0;
for(i = 0; i < MHD_MAX_HANDLERS; i++) {
retVal->handlers[i] = NULL;
}
FD_ZERO(&retVal->read_fd_set);
FD_ZERO(&retVal->write_fd_set);
FD_ZERO(&retVal->except_fd_set);
for(i = 0; i < MHD_MAX_CONNECTIONS; i++) {
retVal->connections[i] = NULL;
}
socket_fd = socket(AF_INET, SOCK_STREAM, 0);
if(socket_fd < 0) {
if((options & MHD_USE_DEBUG) != 0)
perror("Error creating socket!");
return NULL;
}
memset((void *)&servaddr, 0, (size_t)sizeof(servaddr));
if (gethostname(hostid,32) < 0){
if((options & MHD_USE_DEBUG) != 0)
perror("server_tcp:gethostname");
return NULL;
}
if ((hostptr = gethostbyname(hostid)) == NULL){
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "invalid host name, %s\n",hostid);
return NULL;
}
servaddr.sin_family = AF_INET;
memcpy((void *)&(servaddr.sin_addr), (void *)(hostptr->h_addr), hostptr->h_length);
servaddr.sin_port = htons(port);
if (bind(socket_fd, (struct sockaddr *)&servaddr, (socklen_t)sizeof(servaddr)) < 0) {
if((options & MHD_USE_DEBUG) != 0)
perror("server:bind");
return NULL;
}
if(listen(socket_fd, 20) < 0) {
if((options & MHD_USE_DEBUG) != 0)
perror("server:bind");
return NULL;
}
retVal->socket_fd = socket_fd;
retVal->max_fd = socket_fd;
FD_SET(socket_fd, &retVal->read_fd_set);
opt = fcntl(socket_fd, F_GETFL, 0);
res = fcntl(socket_fd, F_SETFL, opt | O_NONBLOCK);
if(res < 0) {
if((options & MHD_USE_DEBUG) != 0)
perror("Error disabling block on socket!");
return NULL;
}
return retVal;
}
if((options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "No options given to start_daemon!\n");
return NULL;
}
/**
* Shutdown an http daemon.
*/
void
MHD_stop_daemon(struct MHD_Daemon * daemon) {
int i, j;
if(daemon == NULL) {
return;
}
if((daemon->options & MHD_USE_DEBUG) != 0)
fprintf(stderr, "Enter MHD_stop_daemon. Stopping daemon on port %i\n", daemon->port);
daemon->shutdown = 1;
if(daemon->pid != (pthread_t)-1) {
pthread_join(daemon->pid, NULL);
}
for(i = 0; i < MHD_MAX_CONNECTIONS; i++) {
if(daemon->connections[i] != NULL) {
if(daemon->connections[i]->pid != (pthread_t)-1) {
pthread_join(daemon->connections[i]->pid, NULL);
}
for(j = 0; j < MHD_MAX_RESPONSE; j++) {
if(daemon->connections[i]->currentResponses[j] != NULL) {
MHD_destroy_response(daemon->connections[i]->currentResponses[j]);
}
}
MHD_destroy_session(daemon->connections[i]);
}
}
for(i = 0; i < MHD_MAX_HANDLERS; i++) {
if(daemon->handlers[i] != NULL) {
free(daemon->handlers[i]->uri_prefix);
free(daemon->handlers[i]);
}
}
close(daemon->socket_fd);
free(daemon);
}
/**
* Unregister an access handler for the URIs beginning with
* uri_prefix.
*
* @param uri_prefix
* @return MHD_NO if a handler for this exact prefix
* is not known for this daemon
*/
int
MHD_unregister_handler(struct MHD_Daemon * daemon,
const char * uri_prefix,
MHD_AccessHandlerCallback dh,
void * dh_cls) {
int i;
for(i = 0; i < MHD_MAX_HANDLERS; i++) {
if(daemon->handlers[i] != NULL) {
if(strncmp(daemon->handlers[i]->uri_prefix, uri_prefix, strlen(daemon->handlers[i]->uri_prefix)) == 0) {
if(daemon->handlers[i]->dh == dh && daemon->handlers[i]->dh_cls == dh_cls) {
free(daemon->handlers[i]->uri_prefix);
free(daemon->handlers[i]);
return MHD_YES;
}
}
}
}
return MHD_NO;
}
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