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-rw-r--r--fuse_sideload.cpp284
1 files changed, 144 insertions, 140 deletions
diff --git a/fuse_sideload.cpp b/fuse_sideload.cpp
index 1725e8823..219374fdb 100644
--- a/fuse_sideload.cpp
+++ b/fuse_sideload.cpp
@@ -61,6 +61,9 @@
#include <sys/uio.h>
#include <unistd.h>
+#include <string>
+
+#include <android-base/stringprintf.h>
#include <openssl/sha.h>
#include "fuse_sideload.h"
@@ -226,11 +229,13 @@ static int handle_open(void* /* data */, struct fuse_data* fd, const struct fuse
return NO_STATUS;
}
-static int handle_flush(void* data, struct fuse_data* fd, const struct fuse_in_header* hdr) {
+static int handle_flush(void* /* data */, struct fuse_data* /* fd */,
+ const struct fuse_in_header* /* hdr */) {
return 0;
}
-static int handle_release(void* data, struct fuse_data* fd, const struct fuse_in_header* hdr) {
+static int handle_release(void* /* data */, struct fuse_data* /* fd */,
+ const struct fuse_in_header* /* hdr */) {
return 0;
}
@@ -362,164 +367,163 @@ static int handle_read(void* data, struct fuse_data* fd, const struct fuse_in_he
return NO_STATUS;
}
-int run_fuse_sideload(struct provider_vtab* vtab, void* cookie,
- uint64_t file_size, uint32_t block_size)
-{
- int result;
-
- // 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);
-
- if (block_size < 1024) {
- fprintf(stderr, "block size (%u) is too small\n", block_size);
- return -1;
- }
- if (block_size > (1<<22)) { // 4 MiB
- fprintf(stderr, "block size (%u) is too large\n", block_size);
- return -1;
- }
-
- struct fuse_data fd;
- memset(&fd, 0, sizeof(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);
-
- if (fd.file_blocks > (1<<18)) {
- fprintf(stderr, "file has too many blocks (%u)\n", fd.file_blocks);
- result = -1;
- 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;
- }
-
- fd.uid = getuid();
- fd.gid = getgid();
-
- fd.curr_block = -1;
- fd.block_data = (uint8_t*)malloc(block_size);
- if (fd.block_data == NULL) {
- fprintf(stderr, "failed to allocate %d bites for block_data\n", block_size);
- result = -1;
- goto done;
+int run_fuse_sideload(struct provider_vtab* vtab, void* cookie, uint64_t file_size,
+ uint32_t block_size) {
+ // 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);
+
+ // fs/fuse/inode.c in kernel code uses the greater of 4096 and the passed-in max_read.
+ if (block_size < 4096) {
+ fprintf(stderr, "block size (%u) is too small\n", block_size);
+ return -1;
+ }
+ if (block_size > (1 << 22)) { // 4 MiB
+ fprintf(stderr, "block size (%u) is too large\n", block_size);
+ return -1;
+ }
+
+ struct 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);
+
+ int result;
+ if (fd.file_blocks > (1 << 18)) {
+ fprintf(stderr, "file has too many blocks (%u)\n", fd.file_blocks);
+ result = -1;
+ 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;
+ }
+
+ fd.uid = getuid();
+ fd.gid = getgid();
+
+ fd.curr_block = -1;
+ fd.block_data = (uint8_t*)malloc(block_size);
+ if (fd.block_data == NULL) {
+ 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) {
+ 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) {
+ perror("open /dev/fuse");
+ result = -1;
+ goto done;
+ }
+
+ {
+ 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);
+
+ result = mount("/dev/fuse", FUSE_SIDELOAD_HOST_MOUNTPOINT, "fuse",
+ MS_NOSUID | MS_NODEV | MS_RDONLY | MS_NOEXEC, opts.c_str());
+ if (result < 0) {
+ perror("mount");
+ goto done;
}
- fd.extra_block = (uint8_t*)malloc(block_size);
- if (fd.extra_block == NULL) {
- fprintf(stderr, "failed to allocate %d bites for extra_block\n", block_size);
+ }
+
+ uint8_t request_buffer[sizeof(struct fuse_in_header) + PATH_MAX * 8];
+ for (;;) {
+ ssize_t len = TEMP_FAILURE_RETRY(read(fd.ffd, request_buffer, sizeof(request_buffer)));
+ if (len == -1) {
+ perror("read request");
+ if (errno == ENODEV) {
result = -1;
- goto done;
+ break;
+ }
+ continue;
}
- fd.ffd = open("/dev/fuse", O_RDWR);
- if (fd.ffd < 0) {
- perror("open /dev/fuse");
- result = -1;
- goto done;
+ if (static_cast<size_t>(len) < sizeof(struct fuse_in_header)) {
+ fprintf(stderr, "request too short: len=%zd\n", len);
+ continue;
}
- char opts[256];
- snprintf(opts, sizeof(opts),
- ("fd=%d,user_id=%d,group_id=%d,max_read=%u,"
- "allow_other,rootmode=040000"),
- fd.ffd, fd.uid, fd.gid, block_size);
-
- result = mount("/dev/fuse", FUSE_SIDELOAD_HOST_MOUNTPOINT,
- "fuse", MS_NOSUID | MS_NODEV | MS_RDONLY | MS_NOEXEC, opts);
- if (result < 0) {
- perror("mount");
- goto done;
- }
- uint8_t request_buffer[sizeof(struct fuse_in_header) + PATH_MAX*8];
- for (;;) {
- ssize_t len = TEMP_FAILURE_RETRY(read(fd.ffd, request_buffer, sizeof(request_buffer)));
- if (len == -1) {
- perror("read request");
- if (errno == ENODEV) {
- result = -1;
- break;
- }
- continue;
- }
-
- if ((size_t)len < sizeof(struct fuse_in_header)) {
- fprintf(stderr, "request too short: len=%zu\n", (size_t)len);
- continue;
- }
+ struct fuse_in_header* hdr = reinterpret_cast<struct fuse_in_header*>(request_buffer);
+ void* data = request_buffer + sizeof(struct fuse_in_header);
- struct fuse_in_header* hdr = (struct fuse_in_header*) request_buffer;
- void* data = request_buffer + sizeof(struct fuse_in_header);
+ result = -ENOSYS;
- result = -ENOSYS;
+ switch (hdr->opcode) {
+ case FUSE_INIT:
+ result = handle_init(data, &fd, hdr);
+ break;
- switch (hdr->opcode) {
- case FUSE_INIT:
- result = handle_init(data, &fd, hdr);
- break;
+ case FUSE_LOOKUP:
+ result = handle_lookup(data, &fd, hdr);
+ break;
- case FUSE_LOOKUP:
- result = handle_lookup(data, &fd, hdr);
- break;
+ case FUSE_GETATTR:
+ result = handle_getattr(data, &fd, hdr);
+ break;
- case FUSE_GETATTR:
- result = handle_getattr(data, &fd, hdr);
- break;
+ case FUSE_OPEN:
+ result = handle_open(data, &fd, hdr);
+ break;
- case FUSE_OPEN:
- result = handle_open(data, &fd, hdr);
- break;
+ case FUSE_READ:
+ result = handle_read(data, &fd, hdr);
+ break;
- case FUSE_READ:
- result = handle_read(data, &fd, hdr);
- break;
+ case FUSE_FLUSH:
+ result = handle_flush(data, &fd, hdr);
+ break;
- case FUSE_FLUSH:
- result = handle_flush(data, &fd, hdr);
- break;
+ case FUSE_RELEASE:
+ result = handle_release(data, &fd, hdr);
+ break;
- case FUSE_RELEASE:
- result = handle_release(data, &fd, hdr);
- break;
-
- default:
- fprintf(stderr, "unknown fuse request opcode %d\n", hdr->opcode);
- break;
- }
+ default:
+ fprintf(stderr, "unknown fuse request opcode %d\n", hdr->opcode);
+ break;
+ }
- if (result == NO_STATUS_EXIT) {
- result = 0;
- break;
- }
+ if (result == NO_STATUS_EXIT) {
+ result = 0;
+ break;
+ }
- if (result != NO_STATUS) {
- struct fuse_out_header outhdr;
- outhdr.len = sizeof(outhdr);
- outhdr.error = result;
- outhdr.unique = hdr->unique;
- TEMP_FAILURE_RETRY(write(fd.ffd, &outhdr, sizeof(outhdr)));
- }
+ if (result != NO_STATUS) {
+ struct fuse_out_header outhdr;
+ outhdr.len = sizeof(outhdr);
+ outhdr.error = result;
+ outhdr.unique = hdr->unique;
+ TEMP_FAILURE_RETRY(write(fd.ffd, &outhdr, sizeof(outhdr)));
}
+ }
- done:
- fd.vtab->close(fd.cookie);
+done:
+ fd.vtab->close(fd.cookie);
- result = umount2(FUSE_SIDELOAD_HOST_MOUNTPOINT, MNT_DETACH);
- if (result < 0) {
- printf("fuse_sideload umount failed: %s\n", strerror(errno));
- }
+ result = umount2(FUSE_SIDELOAD_HOST_MOUNTPOINT, MNT_DETACH);
+ if (result < 0) {
+ printf("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);
+ if (fd.ffd) close(fd.ffd);
+ free(fd.hashes);
+ free(fd.block_data);
+ free(fd.extra_block);
- return result;
+ return result;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 02:48:22 +0100