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Implemented basic upload functionality

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This commit is contained in:
Thomas Kolb 2013-08-19 17:49:36 +02:00
parent d07fc77f7d
commit 54dd5bae12
3 changed files with 231 additions and 50 deletions
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37
include/main.h Normal file
View file

@ -0,0 +1,37 @@
#ifndef MAIN_H
#define MAIN_H
#include <limits.h>
enum ResultCode {
RC_OK = 0, // No problem (so far)
RC_EXISTS = 1, // On upload, the file to be uploaded already existed
RC_OPEN_FAILED = 2, // On upload, opening the file for writing failed
RC_WRONG_TARGET = 3 // On upload, the given URL was not a directory
};
enum RequestType {
GET,
POST
};
struct ConnectionState {
char cleanedURL[PATH_MAX];
char localFileName[PATH_MAX];
struct stat targetStat;
FILE *upload_fd;
enum ResultCode result;
enum RequestType requestType;
struct MHD_PostProcessor *postProcessor;
};
struct RequestRange {
off_t start;
off_t length;
};
#endif // MAIN_H

4
include/util.h
View file

@ -11,6 +11,10 @@
#ifndef UTIL_H
#define UTIL_H
#ifndef MAX
#define MAX(a, b) ((a > b) ? a : b)
#endif
void remove_trailing_slash(char *str);
void urlencode(const char *str, char *result);

240
src/main.c
View file

@ -39,24 +39,16 @@
#include "favicon.h"
#include "util.h"
#include "main.h"
#define DEFAULT_PORT 8888
struct ConnectionState {
char cleanedURL[PATH_MAX];
char localFileName[PATH_MAX];
struct stat targetStat;
};
struct RequestRange {
off_t start;
off_t length;
};
char *shareRoot;
struct MHD_Response *error403Response;
struct MHD_Response *error404Response;
struct MHD_Response *error500Response;
struct MHD_Response *faviconResponse;
struct MHD_Response *uploadFormResponse;
#ifdef HAVE_MAGIC
magic_t magicCookie;
@ -73,6 +65,15 @@ void request_completed(void *cls,
// TODO: show IP+Port in log
LOG(LVL_DEBUG, "Freeing state for request of %s", connstate->localFileName);
// close the upload file if open
if(connstate->upload_fd) {
fclose(connstate->upload_fd);
}
if(connstate->postProcessor) {
MHD_destroy_post_processor(connstate->postProcessor);
}
free(connstate);
}
@ -223,6 +224,115 @@ int serv_directory(struct MHD_Connection *connection, struct ConnectionState *co
return ret;
}
int serv_result_page(struct MHD_Connection *connection, struct ConnectionState *connstate) {
struct MHD_Response *response;
int ret;
char *message, *title;
unsigned int resultCode;
switch(connstate->result) {
case RC_OK:
message = "Request was processed successfully.";
title = "Success";
resultCode = MHD_HTTP_OK;
break;
case RC_EXISTS:
message = "The file you tried to upload already exists on the server.";
title = "File already exists";
resultCode = MHD_HTTP_INTERNAL_SERVER_ERROR;
break;
case RC_OPEN_FAILED:
message = "Could not open the file on the server for writing.";
title = "Open failed";
resultCode = MHD_HTTP_INTERNAL_SERVER_ERROR;
break;
case RC_WRONG_TARGET:
message = "You tried to put a new file into something which is not a directory.";
title = "Target error";
resultCode = MHD_HTTP_INTERNAL_SERVER_ERROR;
break;
}
char *buffer = malloc(strlen(HEADER1 HEADER2 FOOTER) + 1024);
sprintf(buffer, HEADER1 "<title>%s</title>" HEADER2 "<h1>%s</h1><p>%s</p>" FOOTER,
title, title, message);
response = MHD_create_response_from_buffer(
strlen(buffer), buffer, MHD_RESPMEM_MUST_FREE);
MHD_add_response_header(response, MHD_HTTP_HEADER_CONTENT_TYPE, "text/html");
ret = MHD_queue_response(connection, resultCode, response);
MHD_destroy_response(response);
return ret;
}
static int post_processor(void *cls,
enum MHD_ValueKind kind,
const char *key,
const char *filename,
const char *content_type,
const char *transfer_encoding,
const char *data,
uint64_t off,
size_t size) {
LOG(LVL_DUMP, "Entering POST handler (key=%s, filename=%s, contentType=%s, transferEncoding=%s, size=%u)",
key, filename, content_type, transfer_encoding, size);
struct ConnectionState *ci = (struct ConnectionState*)cls;
if(kind == MHD_POSTDATA_KIND) {
if(strcmp("data", key) == 0) {
if(ci->upload_fd == NULL) {
// file pointer not allocated yet
// determine the path where to store the uploaded file
char uploadFilename[PATH_MAX];
if(!S_ISDIR(ci->targetStat.st_mode)) {
LOG(LVL_WARN, "Cannot upload %s: Target path is not an existing directory.", filename);
ci->result = RC_WRONG_TARGET;
return MHD_NO;
}
strncpy(uploadFilename, ci->localFileName, PATH_MAX);
strncat(uploadFilename, "/", PATH_MAX);
strncat(uploadFilename, filename, PATH_MAX);
// check if the file already exists
FILE *tmp = fopen(uploadFilename, "rb");
if(tmp) {
LOG(LVL_WARN, "Cannot upload to %s: file exists.", uploadFilename);
ci->result = RC_EXISTS;
fclose(tmp);
return MHD_NO;
}
// file does not exist and can therefore be opened for writing
ci->upload_fd = fopen(uploadFilename, "wb");
if(!ci->upload_fd) {
LOG(LVL_WARN, "Cannot upload to %s: file cannot be created.", uploadFilename);
ci->result = RC_OPEN_FAILED;
return MHD_NO;
}
fwrite(data, size, 1, ci->upload_fd);
} else {
// file descriptor is already open
fwrite(data, size, 1, ci->upload_fd);
}
}
return MHD_YES;
}
return MHD_NO;
}
static int connection_handler(void * cls,
struct MHD_Connection *connection,
const char *url,
@ -233,17 +343,15 @@ static int connection_handler(void * cls,
void **ptr) {
struct ConnectionState *connstate;
if (0 != strcmp(method, "GET") && 0 != strcmp(method, "HEAD")) {
LOG(LVL_WARN, "Unexpected method: %s.", method);
return MHD_NO;
}
if (*ptr == NULL) {
// This is the first time this connection is seen.
// Initialize the connection state
connstate = malloc(sizeof(struct ConnectionState));
*ptr = connstate;
connstate->result = RC_OK;
connstate->upload_fd = NULL;
// set the local file name
strncpy(connstate->localFileName, shareRoot, PATH_MAX);
strncat(connstate->localFileName, url,
@ -257,49 +365,71 @@ static int connection_handler(void * cls,
LOG(LVL_INFO, "%s %s (local: %s)",
method, url, connstate->localFileName);
if (0 == strcmp(method, "GET") || 0 == strcmp(method, "HEAD")) {
connstate->postProcessor = NULL;
connstate->requestType = GET;
} else if(0 == strcmp(method, "POST")) {
connstate->postProcessor = MHD_create_post_processor(connection, 1024*1024, post_processor, connstate);
connstate->requestType = POST;
} else {
LOG(LVL_WARN, "Unexpected method: %s.", method);
return MHD_NO;
}
// check if url contains a "/.." sequence. If so, block the request as it is
// trying to access the parent directory (and may be an attempt to leave the
// shared space.
if(NULL != strstr(url, "/..")) {
LOG(LVL_WARN, "User is trying to access %s, which may be an attempt to leave the shared space.",
url);
return MHD_queue_response(connection, MHD_HTTP_FORBIDDEN, error403Response);
}
// check properties of the target file/dir
if(stat(connstate->localFileName, &(connstate->targetStat)) == -1) {
LOG(LVL_ERR, "Cannot stat %s: %s",
connstate->localFileName, strerror(errno));
return MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, error404Response);
}
return MHD_YES;
} else {
connstate = *ptr;
}
if (0 != *upload_data_size) {
return MHD_NO; // upload data in a GET!?
}
if(connstate->requestType == GET) {
if (0 != *upload_data_size) {
return MHD_NO; // upload data in a GET!?
}
// serv the favicon, if requested
if(strcmp(url, "/favicon.png") == 0) {
LOG(LVL_INFO, "Serving FavIcon request.");
return MHD_queue_response(connection, MHD_HTTP_OK, faviconResponse);
}
// serv the favicon, if requested
if(strcmp(url, "/favicon.png") == 0) {
LOG(LVL_INFO, "Serving FavIcon request.");
return MHD_queue_response(connection, MHD_HTTP_OK, faviconResponse);
}
// check if url contains a "/.." sequence. If so, block the request as it is
// trying to access the parent directory (and may be an attempt to leave the
// shared space.
if(NULL != strstr(url, "/..")) {
LOG(LVL_WARN, "User is trying to access %s, which may be an attempt to leave the shared space.",
url);
if(S_ISREG(connstate->targetStat.st_mode)) {
return serv_regular_file(connection, connstate);
} else if(S_ISDIR(connstate->targetStat.st_mode)) {
return serv_directory(connection, connstate);
} else {
LOG(LVL_WARN,
"%s is neither a directory nor a regular file. Don't allow the access.",
connstate->localFileName);
return MHD_queue_response(connection, MHD_HTTP_FORBIDDEN, error403Response);
}
return MHD_queue_response(connection, MHD_HTTP_FORBIDDEN, error403Response);
}
} else if(connstate->requestType == POST) {
if (*upload_data_size != 0) {
MHD_post_process (connstate->postProcessor, upload_data, *upload_data_size);
*upload_data_size = 0;
// check properties of the target file/dir
if(stat(connstate->localFileName, &(connstate->targetStat)) == -1) {
LOG(LVL_ERR, "Cannot stat %s: %s",
connstate->localFileName, strerror(errno));
return MHD_queue_response(connection, MHD_HTTP_NOT_FOUND, error404Response);
}
if(S_ISREG(connstate->targetStat.st_mode)) {
return serv_regular_file(connection, connstate);
} else if(S_ISDIR(connstate->targetStat.st_mode)) {
return serv_directory(connection, connstate);
} else {
LOG(LVL_WARN,
"%s is neither a directory nor a regular file. Don't allow the access.",
connstate->localFileName);
return MHD_queue_response(connection, MHD_HTTP_FORBIDDEN, error403Response);
return MHD_YES;
} else {
return serv_result_page(connection, connstate);
}
}
// generate a 500 if request was not handled properly
@ -477,6 +607,15 @@ int main(int argc, char ** argv) {
MHD_add_response_header(error404Response, MHD_HTTP_HEADER_CONTENT_TYPE, "text/html");
MHD_add_response_header(error500Response, MHD_HTTP_HEADER_CONTENT_TYPE, "text/html");
// static response for upload form
uploadFormResponse = MHD_create_response_from_data(
strlen(UPLOAD_FORM),
(void*) UPLOAD_FORM,
MHD_NO,
MHD_NO);
MHD_add_response_header(uploadFormResponse, MHD_HTTP_HEADER_CONTENT_TYPE, "text/html");
// static response for favicon
faviconResponse = create_favicon_response();
@ -527,6 +666,7 @@ int main(int argc, char ** argv) {
MHD_destroy_response(error404Response);
MHD_destroy_response(error500Response);
MHD_destroy_response(faviconResponse);
MHD_destroy_response(uploadFormResponse);
#ifdef HAVE_MAGIC
magic_close(magicCookie);