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boinc/sched/file_upload_handler.C

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// The contents of this file are subject to the Mozilla Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is the Berkeley Open Infrastructure for Network Computing.
//
// The Initial Developer of the Original Code is the SETI@home project.
// Portions created by the SETI@home project are Copyright (C) 2002
// University of California at Berkeley. All Rights Reserved.
//
// Contributor(s):
//
// The BOINC file upload handler.
// See doc/upload.html for protocol spec.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include "parse.h"
#include "util.h"
#include "config.h"
#include "sched_util.h"
#include "crypt.h"
CONFIG config;
#define ERR_TRANSIENT true
#define ERR_PERMANENT false
#define STDERR_FILENAME "file_upload_handler.out"
#define DEBUG
#define MAX_FILES 32
struct FILE_INFO {
char name[256];
double max_nbytes;
char* xml_signature;
char* signed_xml;
int parse(FILE*);
};
int FILE_INFO::parse(FILE* in) {
char buf[256], ebuf[256];
int retval;
memset(this, 0, sizeof(FILE_INFO));
signed_xml = strdup("");
while (fgets(buf, 256, in)) {
if (match_tag(buf, "</file_info>")) return 0;
else if (match_tag(buf, "<xml_signature>")) {
retval = dup_element_contents(in, "</xml_signature>", &xml_signature);
if (retval) return retval;
continue;
}
strcatdup(signed_xml, buf);
if (parse_str(buf, "<name>", name, sizeof(name))) continue;
if (parse_double(buf, "<max_nbytes>", max_nbytes)) continue;
if (match_tag(buf, "<generated_locally/>")) continue;
if (match_tag(buf, "<upload_when_present/>")) continue;
if (match_tag(buf, "<url>")) continue;
sprintf(ebuf, "FILE_INFO::parse: unrecognized: %s \n", buf);
write_log(ebuf);
}
return 1;
}
int return_error(bool transient, char* message) {
char buf[256];
printf(
"Content-type: text/plain\n\n"
"<data_server_reply>\n"
" <status>%d</status>\n"
" <message>%s</message>\n"
"</data_server_reply>\n",
transient?1:-1,
message
);
sprintf(buf, "%s\n", message);
write_log(buf);
return 1;
}
int return_success(char* text) {
printf(
"Content-type: text/plain\n\n"
"<data_server_reply>\n"
" <status>0</status>\n"
);
if (text) {
printf(" %s\n", text);
}
printf("</data_server_reply>\n");
return 0;
}
#define BLOCK_SIZE 16382
// read from socket, write to file
//
int copy_socket_to_file(FILE* in, char* path, double offset, double nbytes) {
unsigned char buf[BLOCK_SIZE];
char buf2[256];
FILE* out;
int retval, n, m;
double bytes_left;
out = fopen(path, "ab");
if (!out) {
return return_error(ERR_TRANSIENT, "can't open file");
}
// TODO: use a 64-bit variant
retval = fseek(out, (long)offset, SEEK_CUR);
if (retval) {
fclose(out);
return return_error(ERR_TRANSIENT, "can't fseek file");
}
bytes_left = nbytes - offset;
if (bytes_left == 0) {
fclose(out);
sprintf(buf2, "offset == nbytes: %f\n", nbytes);
write_log(buf2);
return return_success(0);
}
while (1) {
m = BLOCK_SIZE;
if (m > bytes_left) m = (int)bytes_left;
n = fread(buf, 1, m, in);
if (n <= 0) {
fclose(out);
sprintf(buf2, "fread: asked for %d, got %d", m, n);
return return_error(ERR_TRANSIENT, buf2);
}
m = fwrite(buf, 1, n, out);
if (m != n) {
return return_error(ERR_TRANSIENT, "can't fwrite file");
}
bytes_left -= n;
if (bytes_left == 0) break;
}
fclose(out);
return 0;
}
int handle_file_upload(FILE* in, R_RSA_PUBLIC_KEY& key) {
char buf[256], path[256];
FILE_INFO file_info;
int retval;
double nbytes=-1, offset=0;
bool is_valid;
while (fgets(buf, 256, in)) {
#ifdef DEBUG
write_log(buf);
#endif
if (match_tag(buf, "<file_info>")) {
retval = file_info.parse(in);
if (retval) {
return return_error(ERR_PERMANENT, "FILE_INFO::parse");
}
retval = verify_string(
file_info.signed_xml, file_info.xml_signature, key, is_valid
);
if (retval || !is_valid) {
fprintf(stderr,
"signed xml:\n%s"
"signature:\n%s",
file_info.signed_xml, file_info.xml_signature
);
return return_error(ERR_PERMANENT, "invalid signature");
}
continue;
}
else if (parse_double(buf, "<offset>", offset)) continue;
else if (parse_double(buf, "<nbytes>", nbytes)) continue;
else if (match_tag(buf, "<data>")) {
if (nbytes < 0) {
return return_error(ERR_PERMANENT, "nbytes missing or negative");
}
// enforce limits in signed XML
//
if (nbytes > file_info.max_nbytes) {
sprintf(buf,
"file size (%d KB) exceeds limit (%d KB)",
(int)(nbytes/1024), (int)(file_info.max_nbytes/1024)
);
return return_error(ERR_PERMANENT, buf);
}
// make sure filename is legit
//
if (strstr(file_info.name, "..")) {
sprintf(buf,
"file_upload_handler: .. found in filename: %s",
file_info.name
);
return return_error(ERR_PERMANENT, buf);
}
sprintf(path, "%s/%s", config.upload_dir, file_info.name);
retval = copy_socket_to_file(in, path, offset, nbytes);
if (!retval) {
return_success(0);
}
break;
}
}
return 0;
}
int handle_get_file_size(char* file_name) {
struct stat sbuf;
char path[256], buf[256];
int retval;
// TODO: check to ensure path doesn't point somewhere bad
// Use 64-bit variant
//
sprintf(path, "%s/%s", config.upload_dir, file_name );
retval = stat( path, &sbuf );
if (retval && errno != ENOENT) {
sprintf(buf, "handle_get_file_size: %s, returning error\n", file_name);
write_log(buf);
return return_error(ERR_TRANSIENT, "cannot open file" );
} else if (retval) {
sprintf(buf, "handle_get_file_size: %s, returning zero\n", file_name);
write_log(buf);
return return_success("<file_size>0</file_size>");
} else {
sprintf(buf, "handle_get_file_size: %s, returning %d\n", file_name, sbuf.st_size);
write_log(buf);
sprintf(buf, "<file_size>%d</file_size>", (int)sbuf.st_size);
return return_success(buf);
}
return 0;
}
int handle_request(FILE* in, R_RSA_PUBLIC_KEY& key) {
char buf[256];
char file_name[256];
int major;
bool got_version = false;
while (fgets(buf, 256, in)) {
#ifdef DEBUG
write_log(buf);
#endif
if (parse_int(buf, "<core_client_major_version>", major)) {
if (major != MAJOR_VERSION) {
sprintf(buf,
"Core client has major version %d; "
"expected %d.",
major, MAJOR_VERSION
);
return return_error(ERR_PERMANENT, buf);
} else {
got_version = true;
}
} else if (match_tag(buf, "<file_upload>")) {
if (!got_version) {
return return_error(ERR_PERMANENT, "Missing version");
} else {
return handle_file_upload(in, key);
}
} else if (parse_str(buf, "<get_file_size>", file_name, sizeof(file_name))) {
if (!got_version) {
return return_error(ERR_PERMANENT, "Missing version");
} else {
return handle_get_file_size(file_name);
}
}
}
return 0;
}
int get_key(R_RSA_PUBLIC_KEY& key) {
FILE* f;
int retval;
char buf[256];
sprintf(buf, "%s/upload_public", config.key_dir);
f = fopen(buf, "r");
if (!f) return -1;
retval = scan_key_hex(f, (KEY*)&key, sizeof(key));
fclose(f);
if (retval) return retval;
return 0;
}
int main() {
int retval;
R_RSA_PUBLIC_KEY key;
if (!freopen(STDERR_FILENAME, "a", stderr)) {
fprintf(stderr, "Can't redirect stderr\n");
exit(1);
}
retval = config.parse_file();
if (retval) {
return_error(ERR_TRANSIENT, "can't read config file");
exit(1);
}
retval = get_key(key);
if (retval) {
return_error(ERR_TRANSIENT, "can't read key file");
exit(1);
}
handle_request(stdin, key);
return 0;
}
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