Merge "Clean up fuse_sideload and add a testcase."
am: 73dca3e983
Change-Id: I1d895338f32c5814c22f7134aee579c2a252e8bb
diff --git a/fuse_sdcard_provider.cpp b/fuse_sdcard_provider.cpp
index b0ecf96..46bdf17 100644
--- a/fuse_sdcard_provider.cpp
+++ b/fuse_sdcard_provider.cpp
@@ -14,72 +14,70 @@
* limitations under the License.
*/
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
+#include "fuse_sdcard_provider.h"
+
#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <unistd.h>
-#include <fcntl.h>
+
+#include <functional>
#include <android-base/file.h>
#include "fuse_sideload.h"
struct file_data {
- int fd; // the underlying sdcard file
+ int fd; // the underlying sdcard file
- uint64_t file_size;
- uint32_t block_size;
+ uint64_t file_size;
+ uint32_t block_size;
};
-static int read_block_file(void* cookie, uint32_t block, uint8_t* buffer, uint32_t fetch_size) {
- file_data* fd = reinterpret_cast<file_data*>(cookie);
+static int read_block_file(const file_data& fd, uint32_t block, uint8_t* buffer,
+ uint32_t fetch_size) {
+ off64_t offset = static_cast<off64_t>(block) * fd.block_size;
+ if (TEMP_FAILURE_RETRY(lseek64(fd.fd, offset, SEEK_SET)) == -1) {
+ fprintf(stderr, "seek on sdcard failed: %s\n", strerror(errno));
+ return -EIO;
+ }
- off64_t offset = ((off64_t) block) * fd->block_size;
- if (TEMP_FAILURE_RETRY(lseek64(fd->fd, offset, SEEK_SET)) == -1) {
- fprintf(stderr, "seek on sdcard failed: %s\n", strerror(errno));
- return -EIO;
- }
+ if (!android::base::ReadFully(fd.fd, buffer, fetch_size)) {
+ fprintf(stderr, "read on sdcard failed: %s\n", strerror(errno));
+ return -EIO;
+ }
- if (!android::base::ReadFully(fd->fd, buffer, fetch_size)) {
- fprintf(stderr, "read on sdcard failed: %s\n", strerror(errno));
- return -EIO;
- }
-
- return 0;
-}
-
-static void close_file(void* cookie) {
- file_data* fd = reinterpret_cast<file_data*>(cookie);
- close(fd->fd);
+ return 0;
}
bool start_sdcard_fuse(const char* path) {
- struct stat sb;
- if (stat(path, &sb) == -1) {
- fprintf(stderr, "failed to stat %s: %s\n", path, strerror(errno));
- return false;
- }
+ struct stat sb;
+ if (stat(path, &sb) == -1) {
+ fprintf(stderr, "failed to stat %s: %s\n", path, strerror(errno));
+ return false;
+ }
- file_data fd;
- fd.fd = open(path, O_RDONLY);
- if (fd.fd == -1) {
- fprintf(stderr, "failed to open %s: %s\n", path, strerror(errno));
- return false;
- }
- fd.file_size = sb.st_size;
- fd.block_size = 65536;
+ file_data fd;
+ fd.fd = open(path, O_RDONLY);
+ if (fd.fd == -1) {
+ fprintf(stderr, "failed to open %s: %s\n", path, strerror(errno));
+ return false;
+ }
+ fd.file_size = sb.st_size;
+ fd.block_size = 65536;
- provider_vtab vtab;
- vtab.read_block = read_block_file;
- vtab.close = close_file;
+ provider_vtab vtab;
+ vtab.read_block = std::bind(&read_block_file, fd, std::placeholders::_1, std::placeholders::_2,
+ std::placeholders::_3);
+ vtab.close = [&fd]() { close(fd.fd); };
- // The installation process expects to find the sdcard unmounted.
- // Unmount it with MNT_DETACH so that our open file continues to
- // work but new references see it as unmounted.
- umount2("/sdcard", MNT_DETACH);
+ // The installation process expects to find the sdcard unmounted. Unmount it with MNT_DETACH so
+ // that our open file continues to work but new references see it as unmounted.
+ umount2("/sdcard", MNT_DETACH);
- return run_fuse_sideload(&vtab, &fd, fd.file_size, fd.block_size) == 0;
+ return run_fuse_sideload(vtab, fd.file_size, fd.block_size) == 0;
}
diff --git a/fuse_sideload.cpp b/fuse_sideload.cpp
index 219374f..1c7e98f 100644
--- a/fuse_sideload.cpp
+++ b/fuse_sideload.cpp
@@ -41,337 +41,310 @@
// two files is implemented. In particular, you can't opendir() or
// readdir() on the "/sideload" directory; ls on it won't work.
-#include <ctype.h>
-#include <dirent.h>
+#include "fuse_sideload.h"
+
#include <errno.h>
#include <fcntl.h>
-#include <limits.h>
+#include <limits.h> // PATH_MAX
#include <linux/fuse.h>
-#include <pthread.h>
+#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/inotify.h>
#include <sys/mount.h>
-#include <sys/param.h>
-#include <sys/resource.h>
+#include <sys/param.h> // MIN
#include <sys/stat.h>
-#include <sys/statfs.h>
-#include <sys/time.h>
#include <sys/uio.h>
#include <unistd.h>
+#include <array>
#include <string>
+#include <vector>
#include <android-base/stringprintf.h>
+#include <android-base/unique_fd.h>
#include <openssl/sha.h>
-#include "fuse_sideload.h"
+static constexpr uint64_t PACKAGE_FILE_ID = FUSE_ROOT_ID + 1;
+static constexpr uint64_t EXIT_FLAG_ID = FUSE_ROOT_ID + 2;
-#define PACKAGE_FILE_ID (FUSE_ROOT_ID+1)
-#define EXIT_FLAG_ID (FUSE_ROOT_ID+2)
+static constexpr int NO_STATUS = 1;
+static constexpr int NO_STATUS_EXIT = 2;
-#define NO_STATUS 1
-#define NO_STATUS_EXIT 2
+using SHA256Digest = std::array<uint8_t, SHA256_DIGEST_LENGTH>;
struct fuse_data {
- int ffd; // file descriptor for the fuse socket
+ android::base::unique_fd ffd; // file descriptor for the fuse socket
- struct provider_vtab* vtab;
- void* cookie;
+ provider_vtab vtab;
- uint64_t file_size; // bytes
+ uint64_t file_size; // bytes
- uint32_t block_size; // block size that the adb host is using to send the file to us
- uint32_t file_blocks; // file size in block_size blocks
+ uint32_t block_size; // block size that the adb host is using to send the file to us
+ uint32_t file_blocks; // file size in block_size blocks
- uid_t uid;
- gid_t gid;
+ uid_t uid;
+ gid_t gid;
- uint32_t curr_block; // cache the block most recently read from the host
- uint8_t* block_data;
+ uint32_t curr_block; // cache the block most recently read from the host
+ uint8_t* block_data;
- uint8_t* extra_block; // another block of storage for reads that
- // span two blocks
+ uint8_t* extra_block; // another block of storage for reads that span two blocks
- uint8_t* hashes; // SHA-256 hash of each block (all zeros
- // if block hasn't been read yet)
+ std::vector<SHA256Digest>
+ hashes; // SHA-256 hash of each block (all zeros if block hasn't been read yet)
};
-static void fuse_reply(struct fuse_data* fd, __u64 unique, const void *data, size_t len)
-{
- struct fuse_out_header hdr;
- struct iovec vec[2];
- int res;
+static void fuse_reply(const fuse_data* fd, uint64_t unique, const void* data, size_t len) {
+ fuse_out_header hdr;
+ hdr.len = len + sizeof(hdr);
+ hdr.error = 0;
+ hdr.unique = unique;
- hdr.len = len + sizeof(hdr);
- hdr.error = 0;
- hdr.unique = unique;
+ struct iovec vec[2];
+ vec[0].iov_base = &hdr;
+ vec[0].iov_len = sizeof(hdr);
+ vec[1].iov_base = const_cast<void*>(data);
+ vec[1].iov_len = len;
- vec[0].iov_base = &hdr;
- vec[0].iov_len = sizeof(hdr);
- vec[1].iov_base = /* const_cast */(void*)(data);
- vec[1].iov_len = len;
-
- res = writev(fd->ffd, vec, 2);
- if (res < 0) {
- printf("*** REPLY FAILED *** %s\n", strerror(errno));
- }
+ int res = writev(fd->ffd, vec, 2);
+ if (res == -1) {
+ printf("*** REPLY FAILED *** %s\n", strerror(errno));
+ }
}
-static int handle_init(void* data, struct fuse_data* fd, const struct fuse_in_header* hdr) {
- const struct fuse_init_in* req = reinterpret_cast<const struct fuse_init_in*>(data);
- struct fuse_init_out out;
- size_t fuse_struct_size;
+static int handle_init(void* data, fuse_data* fd, const fuse_in_header* hdr) {
+ const fuse_init_in* req = static_cast<const fuse_init_in*>(data);
+ // Kernel 2.6.16 is the first stable kernel with struct fuse_init_out defined (fuse version 7.6).
+ // The structure is the same from 7.6 through 7.22. Beginning with 7.23, the structure increased
+ // in size and added new parameters.
+ if (req->major != FUSE_KERNEL_VERSION || req->minor < 6) {
+ printf("Fuse kernel version mismatch: Kernel version %d.%d, Expected at least %d.6", req->major,
+ req->minor, FUSE_KERNEL_VERSION);
+ return -1;
+ }
- /* Kernel 2.6.16 is the first stable kernel with struct fuse_init_out
- * defined (fuse version 7.6). The structure is the same from 7.6 through
- * 7.22. Beginning with 7.23, the structure increased in size and added
- * new parameters.
- */
- if (req->major != FUSE_KERNEL_VERSION || req->minor < 6) {
- printf("Fuse kernel version mismatch: Kernel version %d.%d, Expected at least %d.6",
- req->major, req->minor, FUSE_KERNEL_VERSION);
- return -1;
- }
-
- out.minor = MIN(req->minor, FUSE_KERNEL_MINOR_VERSION);
- fuse_struct_size = sizeof(out);
+ fuse_init_out out;
+ out.minor = MIN(req->minor, FUSE_KERNEL_MINOR_VERSION);
+ size_t fuse_struct_size = sizeof(out);
#if defined(FUSE_COMPAT_22_INIT_OUT_SIZE)
- /* FUSE_KERNEL_VERSION >= 23. */
+ /* FUSE_KERNEL_VERSION >= 23. */
- /* If the kernel only works on minor revs older than or equal to 22,
- * then use the older structure size since this code only uses the 7.22
- * version of the structure. */
- if (req->minor <= 22) {
- fuse_struct_size = FUSE_COMPAT_22_INIT_OUT_SIZE;
- }
+ // If the kernel only works on minor revs older than or equal to 22, then use the older structure
+ // size since this code only uses the 7.22 version of the structure.
+ if (req->minor <= 22) {
+ fuse_struct_size = FUSE_COMPAT_22_INIT_OUT_SIZE;
+ }
#endif
- out.major = FUSE_KERNEL_VERSION;
- out.max_readahead = req->max_readahead;
- out.flags = 0;
- out.max_background = 32;
- out.congestion_threshold = 32;
- out.max_write = 4096;
- fuse_reply(fd, hdr->unique, &out, fuse_struct_size);
+ out.major = FUSE_KERNEL_VERSION;
+ out.max_readahead = req->max_readahead;
+ out.flags = 0;
+ out.max_background = 32;
+ out.congestion_threshold = 32;
+ out.max_write = 4096;
+ fuse_reply(fd, hdr->unique, &out, fuse_struct_size);
- return NO_STATUS;
+ return NO_STATUS;
}
-static void fill_attr(struct fuse_attr* attr, struct fuse_data* fd,
- uint64_t nodeid, uint64_t size, uint32_t mode) {
- memset(attr, 0, sizeof(*attr));
- attr->nlink = 1;
- attr->uid = fd->uid;
- attr->gid = fd->gid;
- attr->blksize = 4096;
+static void fill_attr(fuse_attr* attr, const fuse_data* fd, uint64_t nodeid, uint64_t size,
+ uint32_t mode) {
+ *attr = {};
+ attr->nlink = 1;
+ attr->uid = fd->uid;
+ attr->gid = fd->gid;
+ attr->blksize = 4096;
- attr->ino = nodeid;
- attr->size = size;
- attr->blocks = (size == 0) ? 0 : (((size-1) / attr->blksize) + 1);
- attr->mode = mode;
+ attr->ino = nodeid;
+ attr->size = size;
+ attr->blocks = (size == 0) ? 0 : (((size - 1) / attr->blksize) + 1);
+ attr->mode = mode;
}
-static int handle_getattr(void* /* data */, struct fuse_data* fd, const struct fuse_in_header* hdr) {
- struct fuse_attr_out out;
- memset(&out, 0, sizeof(out));
- out.attr_valid = 10;
+static int handle_getattr(void* /* data */, const fuse_data* fd, const fuse_in_header* hdr) {
+ fuse_attr_out out = {};
+ out.attr_valid = 10;
- if (hdr->nodeid == FUSE_ROOT_ID) {
- fill_attr(&(out.attr), fd, hdr->nodeid, 4096, S_IFDIR | 0555);
- } else if (hdr->nodeid == PACKAGE_FILE_ID) {
- fill_attr(&(out.attr), fd, PACKAGE_FILE_ID, fd->file_size, S_IFREG | 0444);
- } else if (hdr->nodeid == EXIT_FLAG_ID) {
- fill_attr(&(out.attr), fd, EXIT_FLAG_ID, 0, S_IFREG | 0);
- } else {
- return -ENOENT;
- }
+ if (hdr->nodeid == FUSE_ROOT_ID) {
+ fill_attr(&(out.attr), fd, hdr->nodeid, 4096, S_IFDIR | 0555);
+ } else if (hdr->nodeid == PACKAGE_FILE_ID) {
+ fill_attr(&(out.attr), fd, PACKAGE_FILE_ID, fd->file_size, S_IFREG | 0444);
+ } else if (hdr->nodeid == EXIT_FLAG_ID) {
+ fill_attr(&(out.attr), fd, EXIT_FLAG_ID, 0, S_IFREG | 0);
+ } else {
+ return -ENOENT;
+ }
- fuse_reply(fd, hdr->unique, &out, sizeof(out));
- return (hdr->nodeid == EXIT_FLAG_ID) ? NO_STATUS_EXIT : NO_STATUS;
+ fuse_reply(fd, hdr->unique, &out, sizeof(out));
+ return (hdr->nodeid == EXIT_FLAG_ID) ? NO_STATUS_EXIT : NO_STATUS;
}
-static int handle_lookup(void* data, struct fuse_data* fd,
- const struct fuse_in_header* hdr) {
- struct fuse_entry_out out;
- memset(&out, 0, sizeof(out));
- out.entry_valid = 10;
- out.attr_valid = 10;
+static int handle_lookup(void* data, const fuse_data* fd, const fuse_in_header* hdr) {
+ if (data == nullptr) return -ENOENT;
- if (strncmp(FUSE_SIDELOAD_HOST_FILENAME, reinterpret_cast<const char*>(data),
- sizeof(FUSE_SIDELOAD_HOST_FILENAME)) == 0) {
- out.nodeid = PACKAGE_FILE_ID;
- out.generation = PACKAGE_FILE_ID;
- fill_attr(&(out.attr), fd, PACKAGE_FILE_ID, fd->file_size, S_IFREG | 0444);
- } else if (strncmp(FUSE_SIDELOAD_HOST_EXIT_FLAG, reinterpret_cast<const char*>(data),
- sizeof(FUSE_SIDELOAD_HOST_EXIT_FLAG)) == 0) {
- out.nodeid = EXIT_FLAG_ID;
- out.generation = EXIT_FLAG_ID;
- fill_attr(&(out.attr), fd, EXIT_FLAG_ID, 0, S_IFREG | 0);
- } else {
- return -ENOENT;
- }
+ fuse_entry_out out = {};
+ out.entry_valid = 10;
+ out.attr_valid = 10;
- fuse_reply(fd, hdr->unique, &out, sizeof(out));
- return (out.nodeid == EXIT_FLAG_ID) ? NO_STATUS_EXIT : NO_STATUS;
+ std::string filename(static_cast<const char*>(data));
+ if (filename == FUSE_SIDELOAD_HOST_FILENAME) {
+ out.nodeid = PACKAGE_FILE_ID;
+ out.generation = PACKAGE_FILE_ID;
+ fill_attr(&(out.attr), fd, PACKAGE_FILE_ID, fd->file_size, S_IFREG | 0444);
+ } else if (filename == FUSE_SIDELOAD_HOST_EXIT_FLAG) {
+ out.nodeid = EXIT_FLAG_ID;
+ out.generation = EXIT_FLAG_ID;
+ fill_attr(&(out.attr), fd, EXIT_FLAG_ID, 0, S_IFREG | 0);
+ } else {
+ return -ENOENT;
+ }
+
+ fuse_reply(fd, hdr->unique, &out, sizeof(out));
+ return (out.nodeid == EXIT_FLAG_ID) ? NO_STATUS_EXIT : NO_STATUS;
}
-static int handle_open(void* /* data */, struct fuse_data* fd, const struct fuse_in_header* hdr) {
- if (hdr->nodeid == EXIT_FLAG_ID) return -EPERM;
- if (hdr->nodeid != PACKAGE_FILE_ID) return -ENOENT;
+static int handle_open(void* /* data */, const fuse_data* fd, const fuse_in_header* hdr) {
+ if (hdr->nodeid == EXIT_FLAG_ID) return -EPERM;
+ if (hdr->nodeid != PACKAGE_FILE_ID) return -ENOENT;
- struct fuse_open_out out;
- memset(&out, 0, sizeof(out));
- out.fh = 10; // an arbitrary number; we always use the same handle
- fuse_reply(fd, hdr->unique, &out, sizeof(out));
- return NO_STATUS;
+ fuse_open_out out = {};
+ out.fh = 10; // an arbitrary number; we always use the same handle
+ fuse_reply(fd, hdr->unique, &out, sizeof(out));
+ return NO_STATUS;
}
-static int handle_flush(void* /* data */, struct fuse_data* /* fd */,
- const struct fuse_in_header* /* hdr */) {
- return 0;
+static int handle_flush(void* /* data */, fuse_data* /* fd */, const fuse_in_header* /* hdr */) {
+ return 0;
}
-static int handle_release(void* /* data */, struct fuse_data* /* fd */,
- const struct fuse_in_header* /* hdr */) {
- return 0;
+static int handle_release(void* /* data */, fuse_data* /* fd */, const fuse_in_header* /* hdr */) {
+ return 0;
}
// Fetch a block from the host into fd->curr_block and fd->block_data.
// Returns 0 on successful fetch, negative otherwise.
-static int fetch_block(struct fuse_data* fd, uint32_t block) {
- if (block == fd->curr_block) {
- return 0;
- }
-
- if (block >= fd->file_blocks) {
- memset(fd->block_data, 0, fd->block_size);
- fd->curr_block = block;
- return 0;
- }
-
- size_t fetch_size = fd->block_size;
- if (block * fd->block_size + fetch_size > fd->file_size) {
- // If we're reading the last (partial) block of the file,
- // expect a shorter response from the host, and pad the rest
- // of the block with zeroes.
- fetch_size = fd->file_size - (block * fd->block_size);
- memset(fd->block_data + fetch_size, 0, fd->block_size - fetch_size);
- }
-
- int result = fd->vtab->read_block(fd->cookie, block, fd->block_data, fetch_size);
- if (result < 0) return result;
-
- fd->curr_block = block;
-
- // Verify the hash of the block we just got from the host.
- //
- // - If the hash of the just-received data matches the stored hash
- // for the block, accept it.
- // - If the stored hash is all zeroes, store the new hash and
- // accept the block (this is the first time we've read this
- // block).
- // - Otherwise, return -EINVAL for the read.
-
- uint8_t hash[SHA256_DIGEST_LENGTH];
- SHA256(fd->block_data, fd->block_size, hash);
- uint8_t* blockhash = fd->hashes + block * SHA256_DIGEST_LENGTH;
- if (memcmp(hash, blockhash, SHA256_DIGEST_LENGTH) == 0) {
- return 0;
- }
-
- int i;
- for (i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
- if (blockhash[i] != 0) {
- fd->curr_block = -1;
- return -EIO;
- }
- }
-
- memcpy(blockhash, hash, SHA256_DIGEST_LENGTH);
+static int fetch_block(fuse_data* fd, uint32_t block) {
+ if (block == fd->curr_block) {
return 0;
+ }
+
+ if (block >= fd->file_blocks) {
+ memset(fd->block_data, 0, fd->block_size);
+ fd->curr_block = block;
+ return 0;
+ }
+
+ size_t fetch_size = fd->block_size;
+ if (block * fd->block_size + fetch_size > fd->file_size) {
+ // If we're reading the last (partial) block of the file, expect a shorter response from the
+ // host, and pad the rest of the block with zeroes.
+ fetch_size = fd->file_size - (block * fd->block_size);
+ memset(fd->block_data + fetch_size, 0, fd->block_size - fetch_size);
+ }
+
+ int result = fd->vtab.read_block(block, fd->block_data, fetch_size);
+ if (result < 0) return result;
+
+ fd->curr_block = block;
+
+ // Verify the hash of the block we just got from the host.
+ //
+ // - If the hash of the just-received data matches the stored hash for the block, accept it.
+ // - If the stored hash is all zeroes, store the new hash and accept the block (this is the first
+ // time we've read this block).
+ // - Otherwise, return -EINVAL for the read.
+
+ SHA256Digest hash;
+ SHA256(fd->block_data, fd->block_size, hash.data());
+
+ const SHA256Digest& blockhash = fd->hashes[block];
+ if (hash == blockhash) {
+ return 0;
+ }
+
+ for (uint8_t i : blockhash) {
+ if (i != 0) {
+ fd->curr_block = -1;
+ return -EIO;
+ }
+ }
+
+ fd->hashes[block] = hash;
+ return 0;
}
-static int handle_read(void* data, struct fuse_data* fd, const struct fuse_in_header* hdr) {
- const struct fuse_read_in* req = reinterpret_cast<const struct fuse_read_in*>(data);
- struct fuse_out_header outhdr;
- struct iovec vec[3];
- int vec_used;
- int result;
+static int handle_read(void* data, fuse_data* fd, const fuse_in_header* hdr) {
+ if (hdr->nodeid != PACKAGE_FILE_ID) return -ENOENT;
- if (hdr->nodeid != PACKAGE_FILE_ID) return -ENOENT;
+ const fuse_read_in* req = static_cast<const fuse_read_in*>(data);
+ uint64_t offset = req->offset;
+ uint32_t size = req->size;
- uint64_t offset = req->offset;
- uint32_t size = req->size;
+ // The docs on the fuse kernel interface are vague about what to do when a read request extends
+ // past the end of the file. We can return a short read -- the return structure does include a
+ // length field -- but in testing that caused the program using the file to segfault. (I
+ // speculate that this is due to the reading program accessing it via mmap; maybe mmap dislikes
+ // when you return something short of a whole page?) To fix this we zero-pad reads that extend
+ // past the end of the file so we're always returning exactly as many bytes as were requested.
+ // (Users of the mapped file have to know its real length anyway.)
- // The docs on the fuse kernel interface are vague about what to
- // do when a read request extends past the end of the file. We
- // can return a short read -- the return structure does include a
- // length field -- but in testing that caused the program using
- // the file to segfault. (I speculate that this is due to the
- // reading program accessing it via mmap; maybe mmap dislikes when
- // you return something short of a whole page?) To fix this we
- // zero-pad reads that extend past the end of the file so we're
- // always returning exactly as many bytes as were requested.
- // (Users of the mapped file have to know its real length anyway.)
+ fuse_out_header outhdr;
+ outhdr.len = sizeof(outhdr) + size;
+ outhdr.error = 0;
+ outhdr.unique = hdr->unique;
- outhdr.len = sizeof(outhdr) + size;
- outhdr.error = 0;
- outhdr.unique = hdr->unique;
- vec[0].iov_base = &outhdr;
- vec[0].iov_len = sizeof(outhdr);
+ struct iovec vec[3];
+ vec[0].iov_base = &outhdr;
+ vec[0].iov_len = sizeof(outhdr);
- uint32_t block = offset / fd->block_size;
- result = fetch_block(fd, block);
+ uint32_t block = offset / fd->block_size;
+ int result = fetch_block(fd, block);
+ if (result != 0) return result;
+
+ // Two cases:
+ //
+ // - the read request is entirely within this block. In this case we can reply immediately.
+ //
+ // - the read request goes over into the next block. Note that since we mount the filesystem
+ // with max_read=block_size, a read can never span more than two blocks. In this case we copy
+ // the block to extra_block and issue a fetch for the following block.
+
+ uint32_t block_offset = offset - (block * fd->block_size);
+
+ int vec_used;
+ if (size + block_offset <= fd->block_size) {
+ // First case: the read fits entirely in the first block.
+
+ vec[1].iov_base = fd->block_data + block_offset;
+ vec[1].iov_len = size;
+ vec_used = 2;
+ } else {
+ // Second case: the read spills over into the next block.
+
+ memcpy(fd->extra_block, fd->block_data + block_offset, fd->block_size - block_offset);
+ vec[1].iov_base = fd->extra_block;
+ vec[1].iov_len = fd->block_size - block_offset;
+
+ result = fetch_block(fd, block + 1);
if (result != 0) return result;
+ vec[2].iov_base = fd->block_data;
+ vec[2].iov_len = size - vec[1].iov_len;
+ vec_used = 3;
+ }
- // Two cases:
- //
- // - the read request is entirely within this block. In this
- // case we can reply immediately.
- //
- // - the read request goes over into the next block. Note that
- // since we mount the filesystem with max_read=block_size, a
- // read can never span more than two blocks. In this case we
- // copy the block to extra_block and issue a fetch for the
- // following block.
-
- uint32_t block_offset = offset - (block * fd->block_size);
-
- if (size + block_offset <= fd->block_size) {
- // First case: the read fits entirely in the first block.
-
- vec[1].iov_base = fd->block_data + block_offset;
- vec[1].iov_len = size;
- vec_used = 2;
- } else {
- // Second case: the read spills over into the next block.
-
- memcpy(fd->extra_block, fd->block_data + block_offset,
- fd->block_size - block_offset);
- vec[1].iov_base = fd->extra_block;
- vec[1].iov_len = fd->block_size - block_offset;
-
- result = fetch_block(fd, block+1);
- if (result != 0) return result;
- vec[2].iov_base = fd->block_data;
- vec[2].iov_len = size - vec[1].iov_len;
- vec_used = 3;
- }
-
- if (writev(fd->ffd, vec, vec_used) < 0) {
- printf("*** READ REPLY FAILED: %s ***\n", strerror(errno));
- }
- return NO_STATUS;
+ if (writev(fd->ffd, vec, vec_used) == -1) {
+ printf("*** READ REPLY FAILED: %s ***\n", strerror(errno));
+ }
+ return NO_STATUS;
}
-int run_fuse_sideload(struct provider_vtab* vtab, void* cookie, uint64_t file_size,
- uint32_t block_size) {
+int run_fuse_sideload(const provider_vtab& vtab, uint64_t file_size, uint32_t block_size,
+ const char* mount_point) {
// If something's already mounted on our mountpoint, try to remove it. (Mostly in case of a
// previous abnormal exit.)
- umount2(FUSE_SIDELOAD_HOST_MOUNTPOINT, MNT_FORCE);
+ umount2(mount_point, MNT_FORCE);
// fs/fuse/inode.c in kernel code uses the greater of 4096 and the passed-in max_read.
if (block_size < 4096) {
@@ -383,9 +356,8 @@
return -1;
}
- struct fuse_data fd = {};
+ fuse_data fd = {};
fd.vtab = vtab;
- fd.cookie = cookie;
fd.file_size = file_size;
fd.block_size = block_size;
fd.file_blocks = (file_size == 0) ? 0 : (((file_size - 1) / block_size) + 1);
@@ -397,33 +369,27 @@
goto done;
}
- fd.hashes = (uint8_t*)calloc(fd.file_blocks, SHA256_DIGEST_LENGTH);
- if (fd.hashes == NULL) {
- fprintf(stderr, "failed to allocate %d bites for hashes\n",
- fd.file_blocks * SHA256_DIGEST_LENGTH);
- result = -1;
- goto done;
- }
-
+ // All hashes will be zero-initialized.
+ fd.hashes.resize(fd.file_blocks);
fd.uid = getuid();
fd.gid = getgid();
fd.curr_block = -1;
- fd.block_data = (uint8_t*)malloc(block_size);
- if (fd.block_data == NULL) {
+ fd.block_data = static_cast<uint8_t*>(malloc(block_size));
+ if (fd.block_data == nullptr) {
fprintf(stderr, "failed to allocate %d bites for block_data\n", block_size);
result = -1;
goto done;
}
- fd.extra_block = (uint8_t*)malloc(block_size);
- if (fd.extra_block == NULL) {
+ fd.extra_block = static_cast<uint8_t*>(malloc(block_size));
+ if (fd.extra_block == nullptr) {
fprintf(stderr, "failed to allocate %d bites for extra_block\n", block_size);
result = -1;
goto done;
}
- fd.ffd = open("/dev/fuse", O_RDWR);
- if (fd.ffd < 0) {
+ fd.ffd.reset(open("/dev/fuse", O_RDWR));
+ if (!fd.ffd) {
perror("open /dev/fuse");
result = -1;
goto done;
@@ -431,18 +397,18 @@
{
std::string opts = android::base::StringPrintf(
- "fd=%d,user_id=%d,group_id=%d,max_read=%u,allow_other,rootmode=040000", fd.ffd, fd.uid,
- fd.gid, block_size);
+ "fd=%d,user_id=%d,group_id=%d,max_read=%u,allow_other,rootmode=040000", fd.ffd.get(),
+ fd.uid, fd.gid, block_size);
- result = mount("/dev/fuse", FUSE_SIDELOAD_HOST_MOUNTPOINT, "fuse",
- MS_NOSUID | MS_NODEV | MS_RDONLY | MS_NOEXEC, opts.c_str());
- if (result < 0) {
+ result = mount("/dev/fuse", mount_point, "fuse", MS_NOSUID | MS_NODEV | MS_RDONLY | MS_NOEXEC,
+ opts.c_str());
+ if (result == -1) {
perror("mount");
goto done;
}
}
- uint8_t request_buffer[sizeof(struct fuse_in_header) + PATH_MAX * 8];
+ uint8_t request_buffer[sizeof(fuse_in_header) + PATH_MAX * 8];
for (;;) {
ssize_t len = TEMP_FAILURE_RETRY(read(fd.ffd, request_buffer, sizeof(request_buffer)));
if (len == -1) {
@@ -454,13 +420,13 @@
continue;
}
- if (static_cast<size_t>(len) < sizeof(struct fuse_in_header)) {
+ if (static_cast<size_t>(len) < sizeof(fuse_in_header)) {
fprintf(stderr, "request too short: len=%zd\n", len);
continue;
}
- struct fuse_in_header* hdr = reinterpret_cast<struct fuse_in_header*>(request_buffer);
- void* data = request_buffer + sizeof(struct fuse_in_header);
+ fuse_in_header* hdr = reinterpret_cast<fuse_in_header*>(request_buffer);
+ void* data = request_buffer + sizeof(fuse_in_header);
result = -ENOSYS;
@@ -504,7 +470,7 @@
}
if (result != NO_STATUS) {
- struct fuse_out_header outhdr;
+ fuse_out_header outhdr;
outhdr.len = sizeof(outhdr);
outhdr.error = result;
outhdr.unique = hdr->unique;
@@ -513,15 +479,12 @@
}
done:
- fd.vtab->close(fd.cookie);
+ fd.vtab.close();
- result = umount2(FUSE_SIDELOAD_HOST_MOUNTPOINT, MNT_DETACH);
- if (result < 0) {
- printf("fuse_sideload umount failed: %s\n", strerror(errno));
+ if (umount2(mount_point, MNT_DETACH) == -1) {
+ fprintf(stderr, "fuse_sideload umount failed: %s\n", strerror(errno));
}
- if (fd.ffd) close(fd.ffd);
- free(fd.hashes);
free(fd.block_data);
free(fd.extra_block);
diff --git a/fuse_sideload.h b/fuse_sideload.h
index c0b16ef..1b34cbd 100644
--- a/fuse_sideload.h
+++ b/fuse_sideload.h
@@ -17,22 +17,24 @@
#ifndef __FUSE_SIDELOAD_H
#define __FUSE_SIDELOAD_H
-// define the filenames created by the sideload FUSE filesystem
-#define FUSE_SIDELOAD_HOST_MOUNTPOINT "/sideload"
-#define FUSE_SIDELOAD_HOST_FILENAME "package.zip"
-#define FUSE_SIDELOAD_HOST_PATHNAME (FUSE_SIDELOAD_HOST_MOUNTPOINT "/" FUSE_SIDELOAD_HOST_FILENAME)
-#define FUSE_SIDELOAD_HOST_EXIT_FLAG "exit"
-#define FUSE_SIDELOAD_HOST_EXIT_PATHNAME (FUSE_SIDELOAD_HOST_MOUNTPOINT "/" FUSE_SIDELOAD_HOST_EXIT_FLAG)
+#include <functional>
+
+// Define the filenames created by the sideload FUSE filesystem.
+static constexpr const char* FUSE_SIDELOAD_HOST_MOUNTPOINT = "/sideload";
+static constexpr const char* FUSE_SIDELOAD_HOST_FILENAME = "package.zip";
+static constexpr const char* FUSE_SIDELOAD_HOST_PATHNAME = "/sideload/package.zip";
+static constexpr const char* FUSE_SIDELOAD_HOST_EXIT_FLAG = "exit";
+static constexpr const char* FUSE_SIDELOAD_HOST_EXIT_PATHNAME = "/sideload/exit";
struct provider_vtab {
- // read a block
- int (*read_block)(void* cookie, uint32_t block, uint8_t* buffer, uint32_t fetch_size);
+ // read a block
+ std::function<int(uint32_t block, uint8_t* buffer, uint32_t fetch_size)> read_block;
- // close down
- void (*close)(void* cookie);
+ // close down
+ std::function<void(void)> close;
};
-int run_fuse_sideload(struct provider_vtab* vtab, void* cookie,
- uint64_t file_size, uint32_t block_size);
+int run_fuse_sideload(const provider_vtab& vtab, uint64_t file_size, uint32_t block_size,
+ const char* mount_point = FUSE_SIDELOAD_HOST_MOUNTPOINT);
#endif
diff --git a/minadbd/fuse_adb_provider.cpp b/minadbd/fuse_adb_provider.cpp
index 0f4c256..9bd3f23 100644
--- a/minadbd/fuse_adb_provider.cpp
+++ b/minadbd/fuse_adb_provider.cpp
@@ -14,46 +14,43 @@
* limitations under the License.
*/
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
+#include "fuse_adb_provider.h"
+
#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <functional>
#include "adb.h"
#include "adb_io.h"
-#include "fuse_adb_provider.h"
#include "fuse_sideload.h"
-int read_block_adb(void* data, uint32_t block, uint8_t* buffer, uint32_t fetch_size) {
- adb_data* ad = reinterpret_cast<adb_data*>(data);
+int read_block_adb(const adb_data& ad, uint32_t block, uint8_t* buffer, uint32_t fetch_size) {
+ if (!WriteFdFmt(ad.sfd, "%08u", block)) {
+ fprintf(stderr, "failed to write to adb host: %s\n", strerror(errno));
+ return -EIO;
+ }
- if (!WriteFdFmt(ad->sfd, "%08u", block)) {
- fprintf(stderr, "failed to write to adb host: %s\n", strerror(errno));
- return -EIO;
- }
+ if (!ReadFdExactly(ad.sfd, buffer, fetch_size)) {
+ fprintf(stderr, "failed to read from adb host: %s\n", strerror(errno));
+ return -EIO;
+ }
- if (!ReadFdExactly(ad->sfd, buffer, fetch_size)) {
- fprintf(stderr, "failed to read from adb host: %s\n", strerror(errno));
- return -EIO;
- }
-
- return 0;
-}
-
-static void close_adb(void* data) {
- adb_data* ad = reinterpret_cast<adb_data*>(data);
- WriteFdExactly(ad->sfd, "DONEDONE");
+ return 0;
}
int run_adb_fuse(int sfd, uint64_t file_size, uint32_t block_size) {
- adb_data ad;
- ad.sfd = sfd;
- ad.file_size = file_size;
- ad.block_size = block_size;
+ adb_data ad;
+ ad.sfd = sfd;
+ ad.file_size = file_size;
+ ad.block_size = block_size;
- provider_vtab vtab;
- vtab.read_block = read_block_adb;
- vtab.close = close_adb;
+ provider_vtab vtab;
+ vtab.read_block = std::bind(read_block_adb, ad, std::placeholders::_1, std::placeholders::_2,
+ std::placeholders::_3);
+ vtab.close = [&ad]() { WriteFdExactly(ad.sfd, "DONEDONE"); };
- return run_fuse_sideload(&vtab, &ad, file_size, block_size);
+ return run_fuse_sideload(vtab, file_size, block_size);
}
diff --git a/minadbd/fuse_adb_provider.h b/minadbd/fuse_adb_provider.h
index 9941709..36d86d5 100644
--- a/minadbd/fuse_adb_provider.h
+++ b/minadbd/fuse_adb_provider.h
@@ -20,13 +20,13 @@
#include <stdint.h>
struct adb_data {
- int sfd; // file descriptor for the adb channel
+ int sfd; // file descriptor for the adb channel
- uint64_t file_size;
- uint32_t block_size;
+ uint64_t file_size;
+ uint32_t block_size;
};
-int read_block_adb(void* cookie, uint32_t block, uint8_t* buffer, uint32_t fetch_size);
+int read_block_adb(const adb_data& ad, uint32_t block, uint8_t* buffer, uint32_t fetch_size);
int run_adb_fuse(int sfd, uint64_t file_size, uint32_t block_size);
#endif
diff --git a/minadbd/fuse_adb_provider_test.cpp b/minadbd/fuse_adb_provider_test.cpp
index 31be2a6..00250e5 100644
--- a/minadbd/fuse_adb_provider_test.cpp
+++ b/minadbd/fuse_adb_provider_test.cpp
@@ -46,8 +46,8 @@
uint32_t block = 1234U;
const char expected_block[] = "00001234";
- ASSERT_EQ(0, read_block_adb(static_cast<void*>(&data), block,
- reinterpret_cast<uint8_t*>(block_data), sizeof(expected_data) - 1));
+ ASSERT_EQ(0, read_block_adb(data, block, reinterpret_cast<uint8_t*>(block_data),
+ sizeof(expected_data) - 1));
// Check that read_block_adb requested the right block.
char block_req[sizeof(expected_block)] = {};
@@ -84,7 +84,7 @@
signal(SIGPIPE, SIG_IGN);
char buf[1];
- ASSERT_EQ(-EIO, read_block_adb(static_cast<void*>(&data), 0, reinterpret_cast<uint8_t*>(buf), 1));
+ ASSERT_EQ(-EIO, read_block_adb(data, 0, reinterpret_cast<uint8_t*>(buf), 1));
close(sockets[0]);
}
diff --git a/tests/component/sideload_test.cpp b/tests/component/sideload_test.cpp
index 40cfc69..b7109fc 100644
--- a/tests/component/sideload_test.cpp
+++ b/tests/component/sideload_test.cpp
@@ -16,6 +16,12 @@
#include <unistd.h>
+#include <string>
+#include <vector>
+
+#include <android-base/file.h>
+#include <android-base/strings.h>
+#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include "fuse_sideload.h"
@@ -26,11 +32,67 @@
TEST(SideloadTest, run_fuse_sideload_wrong_parameters) {
provider_vtab vtab;
- vtab.close = [](void*) {};
+ vtab.close = [](void) {};
- ASSERT_EQ(-1, run_fuse_sideload(&vtab, nullptr, 4096, 4095));
- ASSERT_EQ(-1, run_fuse_sideload(&vtab, nullptr, 4096, (1 << 22) + 1));
+ ASSERT_EQ(-1, run_fuse_sideload(vtab, 4096, 4095));
+ ASSERT_EQ(-1, run_fuse_sideload(vtab, 4096, (1 << 22) + 1));
// Too many blocks.
- ASSERT_EQ(-1, run_fuse_sideload(&vtab, nullptr, ((1 << 18) + 1) * 4096, 4096));
+ ASSERT_EQ(-1, run_fuse_sideload(vtab, ((1 << 18) + 1) * 4096, 4096));
+}
+
+TEST(SideloadTest, run_fuse_sideload) {
+ const std::vector<std::string> blocks = {
+ std::string(2048, 'a') + std::string(2048, 'b'),
+ std::string(2048, 'c') + std::string(2048, 'd'),
+ std::string(2048, 'e') + std::string(2048, 'f'),
+ std::string(2048, 'g') + std::string(2048, 'h'),
+ };
+ const std::string content = android::base::Join(blocks, "");
+ ASSERT_EQ(16384U, content.size());
+
+ provider_vtab vtab;
+ vtab.close = [](void) {};
+ vtab.read_block = [&blocks](uint32_t block, uint8_t* buffer, uint32_t fetch_size) {
+ if (block >= 4) return -1;
+ blocks[block].copy(reinterpret_cast<char*>(buffer), fetch_size);
+ return 0;
+ };
+
+ TemporaryDir mount_point;
+ pid_t pid = fork();
+ if (pid == 0) {
+ ASSERT_EQ(0, run_fuse_sideload(vtab, 16384, 4096, mount_point.path));
+ _exit(EXIT_SUCCESS);
+ }
+
+ std::string package = std::string(mount_point.path) + "/" + FUSE_SIDELOAD_HOST_FILENAME;
+ int status;
+ static constexpr int kSideloadInstallTimeout = 10;
+ for (int i = 0; i < kSideloadInstallTimeout; ++i) {
+ ASSERT_NE(-1, waitpid(pid, &status, WNOHANG));
+
+ struct stat sb;
+ if (stat(package.c_str(), &sb) == 0) {
+ break;
+ }
+
+ if (errno == ENOENT && i < kSideloadInstallTimeout - 1) {
+ sleep(1);
+ continue;
+ }
+ FAIL() << "Timed out waiting for the fuse-provided package.";
+ }
+
+ std::string content_via_fuse;
+ ASSERT_TRUE(android::base::ReadFileToString(package, &content_via_fuse));
+ ASSERT_EQ(content, content_via_fuse);
+
+ std::string exit_flag = std::string(mount_point.path) + "/" + FUSE_SIDELOAD_HOST_EXIT_FLAG;
+ struct stat sb;
+ ASSERT_EQ(0, stat(exit_flag.c_str(), &sb));
+
+ waitpid(pid, &status, 0);
+ ASSERT_EQ(0, WEXITSTATUS(status));
+ ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status));
}