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-rw-r--r--fs/Makefile12
-rw-r--r--fs/tabfs.c498
2 files changed, 379 insertions, 131 deletions
diff --git a/fs/Makefile b/fs/Makefile
index 97ca01a..37f0f3d 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -7,25 +7,26 @@ OSXFUSE_ROOT = /usr/local
# Root for libraries from FreeBSD's ports
FREEBSD_ROOT = /usr/local
-CFLAGS_EXTRA = -DFUSE_USE_VERSION=26 -D_FILE_OFFSET_BITS=64 -Wall -Wno-unused-function -g
+CFLAGS ?= -O2
+CFLAGS_EXTRA = -DFUSE_USE_VERSION=26 -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Wno-unused-result -g
ifeq ($(shell uname -s),Linux)
CFLAGS += $(CFLAGS_EXTRA)
- LIBS = -lfuse
+ LIBS = -lfuse -pthread
endif
ifeq ($(shell uname -s),Darwin)
- CFLAGS = -I$(OSXFUSE_ROOT)/include/osxfuse/fuse -L$(OSXFUSE_ROOT)/lib -D_DARWIN_USE_64_BIT_INODE $(CFLAGS_EXTRA)
+ CFLAGS += -I$(OSXFUSE_ROOT)/include/osxfuse/fuse -L$(OSXFUSE_ROOT)/lib -D_DARWIN_USE_64_BIT_INODE $(CFLAGS_EXTRA)
LIBS = -losxfuse
endif
ifeq ($(shell uname -s),FreeBSD)
CFLAGS += -L$(FREEBSD_ROOT)/lib -I$(FREEBSD_ROOT)/include $(CFLAGS_EXTRA)
- LIBS = -lfuse
+ LIBS = -lfuse -pthread
endif
all: $(TARGETS)
tabfs: tabfs.c
- cc $(CFLAGS) -o $@ $^ $(LIBS)
+ $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
clean:
rm -f $(TARGETS) *.o
@@ -34,3 +35,4 @@ clean:
unmount:
killall -9 tabfs || true
diskutil unmount force mnt || true
+ fusermount -u mnt || true
diff --git a/fs/tabfs.c b/fs/tabfs.c
index fecec22..d00e96c 100644
--- a/fs/tabfs.c
+++ b/fs/tabfs.c
@@ -1,231 +1,477 @@
-// This file should rarely need to be changed. (which is intentional,
-// because it is a pain to program here, it's a pain to recompile and
-// reload it, and it's a pain to debug it.) Most of the real meat of
-// TabFS is on the extension side, not here.
-
-#include <errno.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
#include <pthread.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <assert.h>
+
#include <fuse.h>
#include "vendor/frozen.h"
#include "vendor/frozen.c"
-FILE* l;
+#define eprintln(fmt, ...) fprintf(stderr, fmt "\n", ##__VA_ARGS__)
+
+// protects:
+// - writing to stdout
+// - the "waiters" global
+static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
+
+struct resumedata {
+ unsigned int id;
+ int msgpipe[2];
+ void *data;
+ size_t size;
+};
+
+static struct resumedata **waiters;
+static size_t numwaiters;
+
+static void read_or_die(int fd, void *buf, size_t sz) {
+ size_t sofar = 0;
+ while (sofar < sz) {
+ ssize_t rv = read(fd, (char *)buf+sofar, sz-sofar);
+ if (rv == -1) {
+ if (errno == EINTR || errno == EAGAIN) continue;
+ perror("read error");
+ exit(1);
+ }
+ if (rv == 0) exit(1);
+ sofar += (size_t)rv;
+ }
+}
+static void write_or_die(int fd, void *buf, size_t sz) {
+ size_t sofar = 0;
+ while (sofar < sz) {
+ ssize_t rv = write(fd, (char *)buf+sofar, sz-sofar);
+ if (rv == -1) {
+ if (errno == EINTR || errno == EAGAIN) continue;
+ perror("write error");
+ exit(1);
+ }
+ if (rv == 0) exit(1);
+ sofar += (size_t)rv;
+ }
+}
+
+// documented somewhere in https://developer.chrome.com/docs/apps/nativeMessaging/
+#define MAX_MESSAGE_SIZE (1024*1024)
-static void send_request(const char *fmt, ...) {
- va_list args; va_start(args, fmt);
+static int do_exchange(unsigned int id,
+ char **datap, size_t *sizep,
+ const char *fmt, ...) {
+ *datap = NULL;
+ *sizep = 0;
- char request_data[1024*1024]; // max size of native->Chrome message
- struct json_out out = JSON_OUT_BUF(request_data, sizeof(request_data));
- unsigned int request_len = json_vprintf(&out, fmt, args);
+ char jsonbuf[MAX_MESSAGE_SIZE];
+ struct json_out out = JSON_OUT_BUF(jsonbuf, sizeof(jsonbuf));
+ va_list args;
+ va_start(args, fmt);
+ size_t request_size = (size_t)json_vprintf(&out, fmt, args);
va_end(args);
+ if (request_size > sizeof(jsonbuf)) {
+ eprintln("warning: request too big to send (%zu > %zu)",
+ request_size, sizeof(jsonbuf));
+ return -EMSGSIZE;
+ }
+
+ struct resumedata mydata = {
+ .id = id,
+ .msgpipe = {-1, -1},
+ .data = NULL,
+ .size = 0,
+ };
+ if (-1 == pipe(mydata.msgpipe)) {
+ perror("exchange: pipe");
+ return -EIO;
+ }
+
+ pthread_mutex_lock(&write_lock);
- write(1, (char *) &request_len, 4); // stdout
- unsigned int bytes_written = 0;
- while (bytes_written < request_len) {
- bytes_written += write(1, request_data, request_len);
+ uint32_t size_4bytes = request_size;
+
+ write_or_die(STDOUT_FILENO, &size_4bytes, sizeof(size_4bytes));
+ write_or_die(STDOUT_FILENO, jsonbuf, request_size);
+
+ waiters = realloc(waiters, (numwaiters+1)*sizeof(*waiters));
+ waiters[numwaiters] = &mydata;
+ numwaiters += 1;
+
+ pthread_mutex_unlock(&write_lock);
+
+ char c;
+ read_or_die(mydata.msgpipe[0], &c, 1);
+
+ close(mydata.msgpipe[0]);
+ close(mydata.msgpipe[1]);
+
+ int err;
+ if (1 == json_scanf(mydata.data, mydata.size, "{error: %d}", &err)) {
+ free(mydata.data);
+ return -err;
}
- /* fprintf(l, "req[%s]\n", request_data); fflush(l); */
+
+ *datap = mydata.data;
+ *sizep = mydata.size;
+
+ return 0;
}
-static int await_response(char **resp) {
- unsigned int response_len;
- read(0, (char *) &response_len, 4); // stdin
- char *response_data = malloc(response_len);
- unsigned int bytes_read = 0;
- while (bytes_read < response_len) {
- bytes_read += read(0, response_data + bytes_read, response_len);
+static void *reader_main(void *ud) {
+ (void)ud;
+ for (;;) {
+ uint32_t size_4bytes;
+ read_or_die(STDIN_FILENO, &size_4bytes, sizeof(size_4bytes));
+ size_t insize = size_4bytes;
+
+ char *data = malloc(insize);
+ read_or_die(STDIN_FILENO, data, insize);
+
+ unsigned int id;
+ if (1 != json_scanf(data, insize, "{id: %u}", &id)) {
+ eprintln("reader: warning: got a message without an id, ignoring");
+ free(data);
+ continue;
+ }
+
+ pthread_mutex_lock(&write_lock);
+ int found = 0;
+ unsigned int i = numwaiters;
+ while (i --> 0) {
+ if (waiters[i]->id == id) {
+ char c = '!';
+ waiters[i]->data = data;
+ waiters[i]->size = insize;
+ write_or_die(waiters[i]->msgpipe[1], &c, 1);
+ memmove(&waiters[i], &waiters[i+1],
+ (numwaiters-(i+1))*sizeof(*waiters));
+ numwaiters -= 1;
+ found = 1;
+ break;
+ }
+ }
+ if (!found) {
+ eprintln("reader: warning: got a message for nonexistent waiter %u", id);
+ free(data);
+ }
+ pthread_mutex_unlock(&write_lock);
}
- /* fprintf(l, "resp(%d; expected %d)[%s]\n", bytes_read, response_len, response_data); fflush(l); */
- if (response_data == NULL) {
- // Connection is dead.
- *resp = "{ \"error\": 5 }";
- return strlen(*resp);
+ return NULL;
+}
+
+static int count_fmt_args(const char *s) {
+ int cnt = 0;
+ for (; *s; s++) {
+ if (*s == '%') {
+ if (*(s+1) != '%') cnt++;
+ else s++;
+ }
}
+ return cnt;
+}
+
+#define exchange_json(datap, sizep, keys_fmt, ...) \
+ do { \
+ unsigned int id = pthread_self(); \
+ int req_rv = do_exchange(id, datap, sizep, \
+ "{id: %u, " keys_fmt "}", \
+ id, ##__VA_ARGS__); \
+ if (req_rv != 0) return req_rv; \
+ } while (0)
- *resp = response_data;
- return response_len;
-}
-
-#define receive_response(fmt, ...) \
- do { \
- char *resp; int resp_len; \
- resp_len = await_response(&resp); \
- if (!resp_len) return -EIO; \
- \
- int err; \
- if (json_scanf(resp, resp_len, "{error: %d}", &err) && err) { \
- free(resp); return -err; \
- } \
- \
- json_scanf(resp, resp_len, fmt, __VA_ARGS__); \
- free(resp); \
+#define parse_and_free_response(data, size, keys_fmt, ...) \
+ do { \
+ if (*keys_fmt == '\0') { \
+ /* empty format string, skip the work */ \
+ free(data); data = NULL; \
+ } else { \
+ int num_expected = count_fmt_args(keys_fmt); \
+ int num_scanned = json_scanf(data, size, \
+ "{" keys_fmt "}", \
+ ##__VA_ARGS__); \
+ if (num_scanned == num_expected) { \
+ free(data); data = NULL; \
+ } else { \
+ eprintln("%s: could only parse %d of %d keys!", \
+ __func__, num_expected, num_scanned); \
+ free(data); data = NULL; \
+ return -EIO; \
+ } \
+ } \
} while (0)
static int tabfs_getattr(const char *path, struct stat *stbuf) {
- send_request("{op: %Q, path: %Q}", "getattr", path);
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q",
+ "getattr", path);
memset(stbuf, 0, sizeof(struct stat));
- receive_response("{st_mode: %d, st_nlink: %d, st_size: %d}",
- &stbuf->st_mode, &stbuf->st_nlink, &stbuf->st_size);
+ parse_and_free_response(rdata, rsize,
+ "st_mode: %d, st_nlink: %d, st_size: %d",
+ &stbuf->st_mode, &stbuf->st_nlink, &stbuf->st_size);
+
return 0;
}
static int tabfs_readlink(const char *path, char *buf, size_t size) {
- send_request("{op: %Q, path: %Q}", "readlink", path);
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q",
+ "readlink", path);
- char *scan_buf; int scan_len;
- receive_response("{buf: %V}", &scan_buf, &scan_len);
- memcpy(buf, scan_buf, scan_len < size ? scan_len : size); free(scan_buf);
+ char *scan_buf;
+ int scan_len;
+ parse_and_free_response(rdata, rsize,
+ "buf: %V",
+ &scan_buf, &scan_len);
+
+ // fuse.h:
+ // "If the linkname is too long to fit in the buffer, it should be truncated."
+ if ((size_t)scan_len >= size) scan_len = size-1;
+
+ memcpy(buf, scan_buf, scan_len);
+ buf[scan_len] = '\0';
+
+ free(scan_buf);
return 0;
}
static int tabfs_open(const char *path, struct fuse_file_info *fi) {
- send_request("{op: %Q, path: %Q, flags: %d}", "open", path, fi->flags);
+ char *data;
+ size_t size;
+ exchange_json(&data, &size,
+ "op: %Q, path: %Q, flags: %d",
+ "open", path, fi->flags);
- receive_response("{fh: %d}", &fi->fh);
+ parse_and_free_response(data, size,
+ "fh: %d",
+ &fi->fh);
return 0;
}
-static int
-tabfs_read(const char *path, char *buf, size_t size, off_t offset,
- struct fuse_file_info *fi) {
- send_request("{op: %Q, path: %Q, size: %d, offset: %d, fh: %d, flags: %d}",
- "read", path, size, offset, fi->fh, fi->flags);
+static int tabfs_read(const char *path,
+ char *buf,
+ size_t size,
+ off_t offset,
+ struct fuse_file_info *fi) {
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, size: %d, offset: %d, fh: %d, flags: %d",
+ "read", path, size, offset, fi->fh, fi->flags);
char *scan_buf; int scan_len;
- receive_response("{buf: %V}", &scan_buf, &scan_len);
- memcpy(buf, scan_buf, scan_len < size ? scan_len : size); free(scan_buf);
+ parse_and_free_response(rdata, rsize,
+ "buf: %V",
+ &scan_buf, &scan_len);
+
+ if ((size_t)scan_len > size) scan_len = size;
+ memcpy(buf, scan_buf, scan_len);
+ free(scan_buf);
return scan_len;
}
-static int
-tabfs_write(const char *path, const char *buf, size_t size, off_t offset,
- struct fuse_file_info *fi) {
-
- send_request("{op: %Q, path: %Q, buf: %V, offset: %d, fh: %d, flags: %d}",
- "write", path, buf, size, offset, fi->fh, fi->flags);
-
- int ret; receive_response("{size: %d}", &ret); return ret;
+static int tabfs_write(const char *path,
+ const char *data,
+ size_t size,
+ off_t offset,
+ struct fuse_file_info *fi) {
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, buf: %V, offset: %d, fh: %d, flags: %d",
+ "write", path, data, size, offset, fi->fh, fi->flags);
+
+ int ret;
+ parse_and_free_response(rdata, rsize,
+ "size: %d",
+ &ret);
+
+ return ret;
}
static int tabfs_release(const char *path, struct fuse_file_info *fi) {
- send_request("{op: %Q, path: %Q, fh: %d}",
- "release", path, fi->fh);
+ char *data;
+ size_t size;
+ exchange_json(&data, &size,
+ "op: %Q, path: %Q, fh: %d",
+ "release", path, fi->fh);
+
+ parse_and_free_response(data, size, "");
- receive_response("{}", NULL);
return 0;
}
static int tabfs_opendir(const char *path, struct fuse_file_info *fi) {
- send_request("{op: %Q, path: %Q, flags: %d}",
- "opendir", path, fi->flags);
-
- receive_response("{fh: %d}", &fi->fh);
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, flags: %d",
+ "opendir", path, fi->flags);
+
+ parse_and_free_response(rdata, rsize,
+ "fh: %d",
+ &fi->fh);
+
return 0;
}
-static int
-tabfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
- off_t offset, struct fuse_file_info *fi) {
- send_request("{op: %Q, path: %Q, offset: %d}",
- "readdir", path, offset);
+static int tabfs_readdir(const char *path,
+ void *buf,
+ fuse_fill_dir_t filler,
+ off_t offset,
+ struct fuse_file_info *fi) {
+ (void)fi;
- char *resp; int resp_len;
- resp_len = await_response(&resp);
- if (!resp_len) return -EIO;
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, offset: %d",
+ "readdir", path, offset);
struct json_token t;
- for (int i = 0; json_scanf_array_elem(resp, resp_len, ".entries", i, &t) > 0; i++) {
- char entry[t.len + 1]; snprintf(entry, t.len + 1, "%.*s", t.len, t.ptr);
+ for (int i = 0; json_scanf_array_elem(rdata, rsize, ".entries", i, &t) > 0; i++) {
+ char entry[t.len+1];
+ memcpy(entry, t.ptr, t.len);
+ entry[t.len] = '\0';
filler(buf, entry, NULL, 0);
}
- free(resp);
+ parse_and_free_response(rdata, rsize, "");
+
return 0;
}
static int tabfs_releasedir(const char *path, struct fuse_file_info *fi) {
- send_request("{op: %Q, path: %Q, fh: %d}",
- "releasedir", path, fi->fh);
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, fh: %d",
+ "releasedir", path, fi->fh);
+
+ parse_and_free_response(rdata, rsize, "");
- receive_response("{}", NULL);
return 0;
}
static int tabfs_truncate(const char *path, off_t size) {
- send_request("{op: %Q, path: %Q, size: %d}",
- "truncate", path, size);
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, size: %d",
+ "truncate", path, size);
+
+ parse_and_free_response(rdata, rsize, "");
- receive_response("{}", NULL);
return 0;
}
static int tabfs_unlink(const char *path) {
- send_request("{op: %Q, path: %Q}", "unlink", path);
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q",
+ "unlink", path);
+
+ parse_and_free_response(rdata, rsize, "");
- receive_response("{}", NULL);
return 0;
}
static int tabfs_mkdir(const char *path, mode_t mode) {
- send_request("{op: %Q, path: %Q, mode: %d}", "mkdir", path, mode);
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, mode: %d",
+ "mkdir", path, mode);
+
+ parse_and_free_response(rdata, rsize, "");
- receive_response("{}", NULL);
return 0;
}
static int tabfs_create(const char *path, mode_t mode, struct fuse_file_info *fi) {
- send_request("{op: %Q, path: %Q, mode: %d}", "mkdir", path, mode);
+ (void)fi;
+
+ char *rdata;
+ size_t rsize;
+ exchange_json(&rdata, &rsize,
+ "op: %Q, path: %Q, mode: %d",
+ "mkdir", path, mode);
+
+ parse_and_free_response(rdata, rsize, "");
- receive_response("{}", NULL);
return 0;
}
-static struct fuse_operations tabfs_filesystem_operations = {
+static const struct fuse_operations tabfs_oper = {
.getattr = tabfs_getattr,
.readlink = tabfs_readlink,
- .open = tabfs_open,
- .read = tabfs_read,
- .write = tabfs_write,
- .release = tabfs_release,
+ .open = tabfs_open,
+ .read = tabfs_read,
+ .write = tabfs_write,
+ .release = tabfs_release,
- .opendir = tabfs_opendir,
- .readdir = tabfs_readdir,
+ .opendir = tabfs_opendir,
+ .readdir = tabfs_readdir,
.releasedir = tabfs_releasedir,
- .truncate = tabfs_truncate,
- .unlink = tabfs_unlink,
+ .truncate = tabfs_truncate,
+ .unlink = tabfs_unlink,
- .mkdir = tabfs_mkdir,
- .create = tabfs_create
+ .mkdir = tabfs_mkdir,
+ .create = tabfs_create,
};
int main(int argc, char **argv) {
- char killcmd[1000];
- sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9", getpid());
+ (void)argc;
+
+ freopen("log.txt", "a", stderr);
+ setvbuf(stderr, NULL, _IONBF, 0);
+
+ char killcmd[128];
+ sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9 2>/dev/null", getpid());
system(killcmd);
-#ifdef __APPLE__
- system("diskutil umount force mnt > /dev/null");
-#elif __FreeBSD__
- system("umount -f mnt");
+
+#if defined(__APPLE__)
+ system("diskutil umount force mnt >/dev/null");
+#elif defined(__FreeBSD__)
+ system("umount -f mnt 2>/dev/null");
#else
- system("fusermount -u mnt");
+ system("fusermount -u mnt 2>/dev/null");
#endif
- l = fopen("log.txt", "w");
- for (int i = 0; i < argc; i++) {
- fprintf(l, "arg%d: [%s]\n", i, argv[i]); fflush(l);
+ mkdir("mnt", 0755);
+
+ pthread_t thread;
+ int err = pthread_create(&thread, NULL, reader_main, NULL);
+ if (err != 0) {
+ eprintln("pthread_create: %s", strerror(err));
+ exit(1);
}
- char* fuse_argv[] = {argv[0], "-odirect_io", "-s", "-f", "mnt"};
- return fuse_main(5, fuse_argv, &tabfs_filesystem_operations, NULL);
+ pthread_detach(thread);
+
+ char *fuse_argv[] = {
+ argv[0],
+ "-f",
+ "-oauto_unmount",
+ "-odirect_io",
+ "mnt",
+ NULL,
+ };
+ return fuse_main(
+ (sizeof(fuse_argv)/sizeof(*fuse_argv))-1,
+ (char **)&fuse_argv,
+ &tabfs_oper,
+ NULL);
}