mirror of
https://github.com/osnr/TabFS.git
synced 2024-05-21 15:06:47 +02:00
adf4330f54
also (... at the same time ...) more work on refactoring background.js to eliminate middle layer, I guess
360 lines
13 KiB
C
360 lines
13 KiB
C
// This file should rarely need to be changed. (which is intentional,
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// because it is a pain to program here, it's a pain to recompile and
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// reload it, and it's a pain to debug it.) Most of the real meat of
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// TabFS is on the extension side, not here.
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <fuse.h>
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#include "cJSON/cJSON.h"
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#include "cJSON/cJSON.c"
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#include "frozen/frozen.h"
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#include "frozen/frozen.c"
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#include "base64/base64.h"
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#include "base64/base64.c"
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FILE* l;
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static void send_request(const char *fmt, ...) {
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va_list args; va_start(args, fmt);
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char request_data[1024*1024]; // max size of native->Chrome message
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struct json_out out = JSON_OUT_BUF(request_data, sizeof(request_data));
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unsigned int request_len = json_vprintf(&out, fmt, args);
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va_end(args);
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write(1, (char *) &request_len, 4); // stdout
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unsigned int bytes_written = 0;
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while (bytes_written < request_len) {
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bytes_written += write(1, request_data, request_len);
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}
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/* fprintf(l, "req[%s]\n", request_data); fflush(l); */
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}
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static int await_response(char **resp) {
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unsigned int response_len;
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read(0, (char *) &response_len, 4); // stdin
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char *response_data = malloc(response_len);
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unsigned int bytes_read = 0;
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while (bytes_read < response_len) {
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bytes_read += read(0, response_data + bytes_read, response_len);
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}
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/* fprintf(l, "resp(%d; expected %d)[%s]\n", bytes_read, response_len, response_data); fflush(l); */
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if (response_data == NULL) {
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// Connection is dead.
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*resp = "{ \"error\": 5 }";
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return strlen(*resp);
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}
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*resp = response_data;
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return response_len;
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}
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// This helper macro is used to implement all the FUSE fs operations.
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//
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// It constructs a JSON object to represent the incoming request, then
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// forwards that object to `send_request_then_await_response` (which
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// then dispatches it to our browser extension over stdout). It awaits
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// the response from the browser over stdin, then lets us pull that
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// apart to ultimately return the data to FUSE.
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//
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// OP is an opcode string which the extension handles in JS.
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// REQ_BUILDER_BODY is a block which should add whatever request
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// properties you want to send to the browser to the `req` cJSON
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// object. RESP_HANDLER_BODY should handle whatever response
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// properties are on the `resp` cJSON object and pass them back to the
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// kernel. It should also set the value of `ret` to the desired
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// return value. (MAKE_REQ takes over return from the containing
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// function so it can automatically return error values.)
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#define MAKE_REQ(OP, REQ_BUILDER_BODY, RESP_HANDLER_BODY) \
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do { \
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int ret = -1; \
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cJSON *req = NULL; \
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cJSON *resp = NULL; \
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\
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req = cJSON_CreateObject(); \
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cJSON_AddStringToObject(req, "op", OP); \
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REQ_BUILDER_BODY \
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\
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resp = send_request_then_await_response(req); \
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\
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cJSON *error_item = cJSON_GetObjectItemCaseSensitive(resp, "error"); \
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if (error_item) { \
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ret = -error_item->valueint; \
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if (ret != 0) goto done; \
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} \
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\
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ret = -1; \
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RESP_HANDLER_BODY \
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\
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done: \
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if (req != NULL) cJSON_Delete(req); \
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if (resp != NULL) cJSON_Delete(resp); \
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return ret; \
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} while (0)
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#define JSON_GET_PROP_INT(LVALUE, KEY) \
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do { \
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LVALUE = cJSON_GetObjectItemCaseSensitive(resp, KEY)->valueint; \
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} while (0)
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#define receive_response(fmt, ...) \
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do { \
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char *resp; int resp_len; \
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resp_len = await_response(&resp); \
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if (!resp_len) return -EIO; \
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\
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int err; \
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if (json_scanf(resp, resp_len, "{error: %d}", &err) && err) { \
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free(resp); return -err; \
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} \
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\
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json_scanf(resp, resp_len, fmt, __VA_ARGS__); \
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free(resp); \
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} while (0)
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static int tabfs_getattr(const char *path, struct stat *stbuf) {
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send_request("{op: %Q, path: %Q}", "getattr", path);
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memset(stbuf, 0, sizeof(struct stat));
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receive_response("{st_mode: %d, st_nlink: %d, st_size: %d}",
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&stbuf->st_mode, &stbuf->st_nlink, &stbuf->st_size);
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return 0;
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/* MAKE_REQ("getattr", { */
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/* /\* cJSON_AddStringToObject(req, "path", path); *\/ */
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/* }, { */
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/* JSON_GET_PROP_INT(stbuf->st_mode, "st_mode"); */
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/* JSON_GET_PROP_INT(stbuf->st_nlink, "st_nlink"); */
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/* JSON_GET_PROP_INT(stbuf->st_size, "st_size"); */
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/* ret = 0; */
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/* }); */
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}
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static int tabfs_readlink(const char *path, char *buf, size_t size) {
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send_request("{op: %Q, path: %Q}", "readlink", path);
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char *scan_buf; receive_response("{buf: %Q}", &scan_buf);
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snprintf(buf, size, "%s", scan_buf); free(scan_buf);
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return 0;
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/* MAKE_REQ("readlink", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* }, { */
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/* cJSON *resp_buf_item = cJSON_GetObjectItemCaseSensitive(resp, "buf"); */
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/* // FIXME: fix */
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/* char *resp_buf = cJSON_GetStringValue(resp_buf_item); */
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/* size_t resp_buf_size = strlen(resp_buf) + 1; */
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/* size = resp_buf_size < size ? resp_buf_size : size; */
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/* memcpy(buf, resp_buf, size); */
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/* ret = 0; */
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/* }); */
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}
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static int tabfs_open(const char *path, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, flags: %d}", "open", path, fi->flags);
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receive_response("{fh: %d}", &fi->fh);
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return 0;
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/* MAKE_REQ("open", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* cJSON_AddNumberToObject(req, "flags", fi->flags); */
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/* }, { */
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/* cJSON *fh_item = cJSON_GetObjectItemCaseSensitive(resp, "fh"); */
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/* if (!fh_item) return -EIO; */
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/* fi->fh = fh_item->valueint; */
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/* ret = 0; */
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/* }); */
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}
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static int
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tabfs_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, size: %d, offset: %d, fh: %d, flags: %d}",
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"read", path, size, offset, fi->fh, fi->flags);
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char *scan_buf; receive_response("{buf: %Q}", &scan_buf);
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snprintf(buf, size, "%s", scan_buf); free(scan_buf);
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return 0;
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/* MAKE_REQ("read", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* cJSON_AddNumberToObject(req, "size", size); */
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/* cJSON_AddNumberToObject(req, "offset", offset); */
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/* cJSON_AddNumberToObject(req, "fh", fi->fh); */
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/* cJSON_AddNumberToObject(req, "flags", fi->flags); */
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/* }, { */
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/* cJSON *resp_buf_item = cJSON_GetObjectItemCaseSensitive(resp, "buf"); */
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/* if (!resp_buf_item) return -EIO; */
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/* char *resp_buf = cJSON_GetStringValue(resp_buf_item); */
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/* if (!resp_buf) return -EIO; */
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/* size_t resp_buf_len = strlen(resp_buf); */
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/* cJSON *base64_encoded_item = cJSON_GetObjectItemCaseSensitive(resp, "base64Encoded"); */
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/* if (base64_encoded_item && cJSON_IsTrue(base64_encoded_item)) { */
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/* size = base64_decode(resp_buf, resp_buf_len, (unsigned char *) buf); */
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/* } else { */
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/* size = resp_buf_len < size ? resp_buf_len : size; */
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/* memcpy(buf, resp_buf, size); */
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/* } */
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/* ret = size; */
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/* }); */
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}
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static int
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tabfs_write(const char *path, const char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, buf: %V, offset: %d, fh: %d, flags: %d}",
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"write", path, size, buf, offset, fi->fh, fi->flags);
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int ret; receive_response("{size: %d}", &ret); return ret;
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/* MAKE_REQ("write", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* char base64_buf[size + 1]; // ughh. */
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/* base64_encode((const unsigned char *) buf, size, base64_buf); */
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/* cJSON_AddStringToObject(req, "buf", base64_buf); */
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/* cJSON_AddNumberToObject(req, "offset", offset); */
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/* }, { */
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/* ret = size; */
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/* }); */
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}
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static int tabfs_release(const char *path, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, fh: %d}",
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"release", path, fi->fh);
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receive_response("{}", NULL);
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return 0;
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/* MAKE_REQ("release", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* cJSON_AddNumberToObject(req, "fh", fi->fh); */
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/* }, { */
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/* ret = 0; */
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/* }); */
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}
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static int tabfs_opendir(const char *path, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, flags: %d}",
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"opendir", path, fi->flags);
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receive_response("{fh: %d}", &fi->fh);
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return 0;
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/* MAKE_REQ("opendir", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* cJSON_AddNumberToObject(req, "flags", fi->flags); */
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/* }, { */
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/* cJSON *fh_item = cJSON_GetObjectItemCaseSensitive(resp, "fh"); */
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/* if (fh_item) fi->fh = fh_item->valueint; */
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/* ret = 0; */
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/* }); */
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}
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static int
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tabfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, offset: %d}",
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"readdir", path, offset);
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char *resp; int resp_len;
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resp_len = await_response(&resp);
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if (!resp_len) return -EIO;
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struct json_token t;
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for (int i = 0; json_scanf_array_elem(resp, resp_len, ".entries", i, &t) > 0; i++) {
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char entry[t.len + 1]; snprintf(entry, t.len + 1, "%.*s", t.len, t.ptr);
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filler(buf, entry, NULL, 0);
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}
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free(resp);
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return 0;
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/* MAKE_REQ("readdir", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* }, { */
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/* cJSON *entries = cJSON_GetObjectItemCaseSensitive(resp, "entries"); */
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/* cJSON *entry; */
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/* cJSON_ArrayForEach(entry, entries) { */
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/* filler(buf, cJSON_GetStringValue(entry), NULL, 0); */
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/* } */
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/* ret = 0; */
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/* }); */
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}
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static int
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tabfs_releasedir(const char *path, struct fuse_file_info *fi) {
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send_request("{op: %Q, path: %Q, fh: %d}",
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"release", path, fi->fh);
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receive_response("{}", NULL);
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return 0;
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/* MAKE_REQ("releasedir", { */
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/* cJSON_AddStringToObject(req, "path", path); */
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/* cJSON_AddNumberToObject(req, "fh", fi->fh); */
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/* }, { */
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/* ret = 0; */
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/* }); */
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}
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static struct fuse_operations tabfs_filesystem_operations = {
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.getattr = tabfs_getattr, /* To provide size, permissions, etc. */
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.readlink = tabfs_readlink,
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.open = tabfs_open, /* To enforce read-only access. */
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.read = tabfs_read, /* To provide file content. */
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.write = tabfs_write,
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.release = tabfs_release,
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.opendir = tabfs_opendir,
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.readdir = tabfs_readdir, /* To provide directory listing. */
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.releasedir = tabfs_releasedir
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};
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int main(int argc, char **argv) {
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char killcmd[1000];
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sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9", getpid());
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system(killcmd);
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#ifdef __APPLE__
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system("diskutil umount force mnt > /dev/null");
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#else
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system("fusermount -u mnt");
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#endif
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l = fopen("log.txt", "w");
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for (int i = 0; i < argc; i++) {
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fprintf(l, "arg%d: [%s]\n", i, argv[i]); fflush(l);
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}
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char* fuse_argv[] = {argv[0], "-odirect_io", "-s", "-f", "mnt"};
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return fuse_main(5, fuse_argv, &tabfs_filesystem_operations, NULL);
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}
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