adb: switch over to Android.bp.

Rearrange some files while we're doing this.

Bug: http://b/71721338
Test: manually ran adb on windows
Change-Id: Ie47bda82279e4b9521505ad0353bf9ef649fc7d7

1 files changed, 532 insertions, 0 deletions

diff --git a/adb/daemon/file_sync_service.cpp b/adb/daemon/file_sync_service.cpp
new file mode 100644
index 000000000..9a87931a3
--- /dev/null
+++ b/adb/daemon/file_sync_service.cpp
@@ -0,0 +1,532 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define TRACE_TAG SYNC
+
+#include "sysdeps.h"
+#include "file_sync_service.h"
+
+#include <dirent.h>
+#include <errno.h>
+#include <linux/xattr.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
+#include <unistd.h>
+#include <utime.h>
+
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
+#include <private/android_filesystem_config.h>
+#include <private/android_logger.h>
+#include <selinux/android.h>
+
+#include "adb.h"
+#include "adb_io.h"
+#include "adb_trace.h"
+#include "adb_utils.h"
+#include "security_log_tags.h"
+#include "sysdeps/errno.h"
+
+using android::base::StringPrintf;
+
+static bool should_use_fs_config(const std::string& path) {
+    // TODO: use fs_config to configure permissions on /data.
+    return android::base::StartsWith(path, "/system/") ||
+           android::base::StartsWith(path, "/vendor/") ||
+           android::base::StartsWith(path, "/oem/");
+}
+
+static bool update_capabilities(const char* path, uint64_t capabilities) {
+    if (capabilities == 0) {
+        // Ensure we clean up in case the capabilities weren't 0 in the past.
+        removexattr(path, XATTR_NAME_CAPS);
+        return true;
+    }
+
+    vfs_cap_data cap_data = {};
+    cap_data.magic_etc = VFS_CAP_REVISION_2 | VFS_CAP_FLAGS_EFFECTIVE;
+    cap_data.data[0].permitted = (capabilities & 0xffffffff);
+    cap_data.data[0].inheritable = 0;
+    cap_data.data[1].permitted = (capabilities >> 32);
+    cap_data.data[1].inheritable = 0;
+    return setxattr(path, XATTR_NAME_CAPS, &cap_data, sizeof(cap_data), 0) != -1;
+}
+
+static bool secure_mkdirs(const std::string& path) {
+    uid_t uid = -1;
+    gid_t gid = -1;
+    unsigned int mode = 0775;
+    uint64_t capabilities = 0;
+
+    if (path[0] != '/') return false;
+
+    std::vector<std::string> path_components = android::base::Split(path, "/");
+    std::string partial_path;
+    for (const auto& path_component : path_components) {
+        if (partial_path.back() != OS_PATH_SEPARATOR) partial_path += OS_PATH_SEPARATOR;
+        partial_path += path_component;
+
+        if (should_use_fs_config(partial_path)) {
+            fs_config(partial_path.c_str(), 1, nullptr, &uid, &gid, &mode, &capabilities);
+        }
+        if (adb_mkdir(partial_path.c_str(), mode) == -1) {
+            if (errno != EEXIST) {
+                return false;
+            }
+        } else {
+            if (chown(partial_path.c_str(), uid, gid) == -1) return false;
+
+            // Not all filesystems support setting SELinux labels. http://b/23530370.
+            selinux_android_restorecon(partial_path.c_str(), 0);
+
+            if (!update_capabilities(partial_path.c_str(), capabilities)) return false;
+        }
+    }
+    return true;
+}
+
+static bool do_lstat_v1(int s, const char* path) {
+    syncmsg msg = {};
+    msg.stat_v1.id = ID_LSTAT_V1;
+
+    struct stat st = {};
+    lstat(path, &st);
+    msg.stat_v1.mode = st.st_mode;
+    msg.stat_v1.size = st.st_size;
+    msg.stat_v1.time = st.st_mtime;
+    return WriteFdExactly(s, &msg.stat_v1, sizeof(msg.stat_v1));
+}
+
+static bool do_stat_v2(int s, uint32_t id, const char* path) {
+    syncmsg msg = {};
+    msg.stat_v2.id = id;
+
+    decltype(&stat) stat_fn;
+    if (id == ID_STAT_V2) {
+        stat_fn = stat;
+    } else {
+        stat_fn = lstat;
+    }
+
+    struct stat st = {};
+    int rc = stat_fn(path, &st);
+    if (rc == -1) {
+        msg.stat_v2.error = errno_to_wire(errno);
+    } else {
+        msg.stat_v2.dev = st.st_dev;
+        msg.stat_v2.ino = st.st_ino;
+        msg.stat_v2.mode = st.st_mode;
+        msg.stat_v2.nlink = st.st_nlink;
+        msg.stat_v2.uid = st.st_uid;
+        msg.stat_v2.gid = st.st_gid;
+        msg.stat_v2.size = st.st_size;
+        msg.stat_v2.atime = st.st_atime;
+        msg.stat_v2.mtime = st.st_mtime;
+        msg.stat_v2.ctime = st.st_ctime;
+    }
+
+    return WriteFdExactly(s, &msg.stat_v2, sizeof(msg.stat_v2));
+}
+
+static bool do_list(int s, const char* path) {
+    dirent* de;
+
+    syncmsg msg;
+    msg.dent.id = ID_DENT;
+
+    std::unique_ptr<DIR, int(*)(DIR*)> d(opendir(path), closedir);
+    if (!d) goto done;
+
+    while ((de = readdir(d.get()))) {
+        std::string filename(StringPrintf("%s/%s", path, de->d_name));
+
+        struct stat st;
+        if (lstat(filename.c_str(), &st) == 0) {
+            size_t d_name_length = strlen(de->d_name);
+            msg.dent.mode = st.st_mode;
+            msg.dent.size = st.st_size;
+            msg.dent.time = st.st_mtime;
+            msg.dent.namelen = d_name_length;
+
+            if (!WriteFdExactly(s, &msg.dent, sizeof(msg.dent)) ||
+                    !WriteFdExactly(s, de->d_name, d_name_length)) {
+                return false;
+            }
+        }
+    }
+
+done:
+    msg.dent.id = ID_DONE;
+    msg.dent.mode = 0;
+    msg.dent.size = 0;
+    msg.dent.time = 0;
+    msg.dent.namelen = 0;
+    return WriteFdExactly(s, &msg.dent, sizeof(msg.dent));
+}
+
+// Make sure that SendFail from adb_io.cpp isn't accidentally used in this file.
+#pragma GCC poison SendFail
+
+static bool SendSyncFail(int fd, const std::string& reason) {
+    D("sync: failure: %s", reason.c_str());
+
+    syncmsg msg;
+    msg.data.id = ID_FAIL;
+    msg.data.size = reason.size();
+    return WriteFdExactly(fd, &msg.data, sizeof(msg.data)) && WriteFdExactly(fd, reason);
+}
+
+static bool SendSyncFailErrno(int fd, const std::string& reason) {
+    return SendSyncFail(fd, StringPrintf("%s: %s", reason.c_str(), strerror(errno)));
+}
+
+static bool handle_send_file(int s, const char* path, uid_t uid, gid_t gid, uint64_t capabilities,
+                             mode_t mode, std::vector<char>& buffer, bool do_unlink) {
+    syncmsg msg;
+    unsigned int timestamp = 0;
+
+    __android_log_security_bswrite(SEC_TAG_ADB_SEND_FILE, path);
+
+    int fd = adb_open_mode(path, O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC, mode);
+
+    if (posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL | POSIX_FADV_NOREUSE | POSIX_FADV_WILLNEED) <
+        0) {
+        D("[ Failed to fadvise: %d ]", errno);
+    }
+
+    if (fd < 0 && errno == ENOENT) {
+        if (!secure_mkdirs(android::base::Dirname(path))) {
+            SendSyncFailErrno(s, "secure_mkdirs failed");
+            goto fail;
+        }
+        fd = adb_open_mode(path, O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC, mode);
+    }
+    if (fd < 0 && errno == EEXIST) {
+        fd = adb_open_mode(path, O_WRONLY | O_CLOEXEC, mode);
+    }
+    if (fd < 0) {
+        SendSyncFailErrno(s, "couldn't create file");
+        goto fail;
+    } else {
+        if (fchown(fd, uid, gid) == -1) {
+            SendSyncFailErrno(s, "fchown failed");
+            goto fail;
+        }
+
+        // Not all filesystems support setting SELinux labels. http://b/23530370.
+        selinux_android_restorecon(path, 0);
+
+        // fchown clears the setuid bit - restore it if present.
+        // Ignore the result of calling fchmod. It's not supported
+        // by all filesystems, so we don't check for success. b/12441485
+        fchmod(fd, mode);
+    }
+
+    while (true) {
+        if (!ReadFdExactly(s, &msg.data, sizeof(msg.data))) goto fail;
+
+        if (msg.data.id != ID_DATA) {
+            if (msg.data.id == ID_DONE) {
+                timestamp = msg.data.size;
+                break;
+            }
+            SendSyncFail(s, "invalid data message");
+            goto abort;
+        }
+
+        if (msg.data.size > buffer.size()) {  // TODO: resize buffer?
+            SendSyncFail(s, "oversize data message");
+            goto abort;
+        }
+
+        if (!ReadFdExactly(s, &buffer[0], msg.data.size)) goto abort;
+
+        if (!WriteFdExactly(fd, &buffer[0], msg.data.size)) {
+            SendSyncFailErrno(s, "write failed");
+            goto fail;
+        }
+    }
+
+    adb_close(fd);
+
+    if (!update_capabilities(path, capabilities)) {
+        SendSyncFailErrno(s, "update_capabilities failed");
+        goto fail;
+    }
+
+    utimbuf u;
+    u.actime = timestamp;
+    u.modtime = timestamp;
+    utime(path, &u);
+
+    msg.status.id = ID_OKAY;
+    msg.status.msglen = 0;
+    return WriteFdExactly(s, &msg.status, sizeof(msg.status));
+
+fail:
+    // If there's a problem on the device, we'll send an ID_FAIL message and
+    // close the socket. Unfortunately the kernel will sometimes throw that
+    // data away if the other end keeps writing without reading (which is
+    // the case with old versions of adb). To maintain compatibility, keep
+    // reading and throwing away ID_DATA packets until the other side notices
+    // that we've reported an error.
+    while (true) {
+        if (!ReadFdExactly(s, &msg.data, sizeof(msg.data))) break;
+
+        if (msg.data.id == ID_DONE) {
+            break;
+        } else if (msg.data.id != ID_DATA) {
+            char id[5];
+            memcpy(id, &msg.data.id, sizeof(msg.data.id));
+            id[4] = '\0';
+            D("handle_send_fail received unexpected id '%s' during failure", id);
+            break;
+        }
+
+        if (msg.data.size > buffer.size()) {
+            D("handle_send_fail received oversized packet of length '%u' during failure",
+              msg.data.size);
+            break;
+        }
+
+        if (!ReadFdExactly(s, &buffer[0], msg.data.size)) break;
+    }
+
+abort:
+    if (fd >= 0) adb_close(fd);
+    if (do_unlink) adb_unlink(path);
+    return false;
+}
+
+#if defined(_WIN32)
+extern bool handle_send_link(int s, const std::string& path, std::vector<char>& buffer) __attribute__((error("no symlinks on Windows")));
+#else
+static bool handle_send_link(int s, const std::string& path, std::vector<char>& buffer) {
+    syncmsg msg;
+    unsigned int len;
+    int ret;
+
+    if (!ReadFdExactly(s, &msg.data, sizeof(msg.data))) return false;
+
+    if (msg.data.id != ID_DATA) {
+        SendSyncFail(s, "invalid data message: expected ID_DATA");
+        return false;
+    }
+
+    len = msg.data.size;
+    if (len > buffer.size()) { // TODO: resize buffer?
+        SendSyncFail(s, "oversize data message");
+        return false;
+    }
+    if (!ReadFdExactly(s, &buffer[0], len)) return false;
+
+    ret = symlink(&buffer[0], path.c_str());
+    if (ret && errno == ENOENT) {
+        if (!secure_mkdirs(android::base::Dirname(path))) {
+            SendSyncFailErrno(s, "secure_mkdirs failed");
+            return false;
+        }
+        ret = symlink(&buffer[0], path.c_str());
+    }
+    if (ret) {
+        SendSyncFailErrno(s, "symlink failed");
+        return false;
+    }
+
+    if (!ReadFdExactly(s, &msg.data, sizeof(msg.data))) return false;
+
+    if (msg.data.id == ID_DONE) {
+        msg.status.id = ID_OKAY;
+        msg.status.msglen = 0;
+        if (!WriteFdExactly(s, &msg.status, sizeof(msg.status))) return false;
+    } else {
+        SendSyncFail(s, "invalid data message: expected ID_DONE");
+        return false;
+    }
+
+    return true;
+}
+#endif
+
+static bool do_send(int s, const std::string& spec, std::vector<char>& buffer) {
+    // 'spec' is of the form "/some/path,0755". Break it up.
+    size_t comma = spec.find_last_of(',');
+    if (comma == std::string::npos) {
+        SendSyncFail(s, "missing , in ID_SEND");
+        return false;
+    }
+
+    std::string path = spec.substr(0, comma);
+
+    errno = 0;
+    mode_t mode = strtoul(spec.substr(comma + 1).c_str(), nullptr, 0);
+    if (errno != 0) {
+        SendSyncFail(s, "bad mode");
+        return false;
+    }
+
+    // Don't delete files before copying if they are not "regular" or symlinks.
+    struct stat st;
+    bool do_unlink = (lstat(path.c_str(), &st) == -1) || S_ISREG(st.st_mode) || S_ISLNK(st.st_mode);
+    if (do_unlink) {
+        adb_unlink(path.c_str());
+    }
+
+    if (S_ISLNK(mode)) {
+        return handle_send_link(s, path.c_str(), buffer);
+    }
+
+    // Copy user permission bits to "group" and "other" permissions.
+    mode &= 0777;
+    mode |= ((mode >> 3) & 0070);
+    mode |= ((mode >> 3) & 0007);
+
+    uid_t uid = -1;
+    gid_t gid = -1;
+    uint64_t capabilities = 0;
+    if (should_use_fs_config(path)) {
+        unsigned int broken_api_hack = mode;
+        fs_config(path.c_str(), 0, nullptr, &uid, &gid, &broken_api_hack, &capabilities);
+        mode = broken_api_hack;
+    }
+    return handle_send_file(s, path.c_str(), uid, gid, capabilities, mode, buffer, do_unlink);
+}
+
+static bool do_recv(int s, const char* path, std::vector<char>& buffer) {
+    __android_log_security_bswrite(SEC_TAG_ADB_RECV_FILE, path);
+
+    int fd = adb_open(path, O_RDONLY | O_CLOEXEC);
+    if (fd < 0) {
+        SendSyncFailErrno(s, "open failed");
+        return false;
+    }
+
+    if (posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL | POSIX_FADV_NOREUSE) < 0) {
+        D("[ Failed to fadvise: %d ]", errno);
+    }
+
+    syncmsg msg;
+    msg.data.id = ID_DATA;
+    while (true) {
+        int r = adb_read(fd, &buffer[0], buffer.size() - sizeof(msg.data));
+        if (r <= 0) {
+            if (r == 0) break;
+            SendSyncFailErrno(s, "read failed");
+            adb_close(fd);
+            return false;
+        }
+        msg.data.size = r;
+        if (!WriteFdExactly(s, &msg.data, sizeof(msg.data)) || !WriteFdExactly(s, &buffer[0], r)) {
+            adb_close(fd);
+            return false;
+        }
+    }
+
+    adb_close(fd);
+
+    msg.data.id = ID_DONE;
+    msg.data.size = 0;
+    return WriteFdExactly(s, &msg.data, sizeof(msg.data));
+}
+
+static const char* sync_id_to_name(uint32_t id) {
+  switch (id) {
+    case ID_LSTAT_V1:
+      return "lstat_v1";
+    case ID_LSTAT_V2:
+      return "lstat_v2";
+    case ID_STAT_V2:
+      return "stat_v2";
+    case ID_LIST:
+      return "list";
+    case ID_SEND:
+      return "send";
+    case ID_RECV:
+      return "recv";
+    case ID_QUIT:
+        return "quit";
+    default:
+        return "???";
+  }
+}
+
+static bool handle_sync_command(int fd, std::vector<char>& buffer) {
+    D("sync: waiting for request");
+
+    ATRACE_CALL();
+    SyncRequest request;
+    if (!ReadFdExactly(fd, &request, sizeof(request))) {
+        SendSyncFail(fd, "command read failure");
+        return false;
+    }
+    size_t path_length = request.path_length;
+    if (path_length > 1024) {
+        SendSyncFail(fd, "path too long");
+        return false;
+    }
+    char name[1025];
+    if (!ReadFdExactly(fd, name, path_length)) {
+        SendSyncFail(fd, "filename read failure");
+        return false;
+    }
+    name[path_length] = 0;
+
+    std::string id_name = sync_id_to_name(request.id);
+    std::string trace_name = StringPrintf("%s(%s)", id_name.c_str(), name);
+    ATRACE_NAME(trace_name.c_str());
+
+    D("sync: %s('%s')", id_name.c_str(), name);
+    switch (request.id) {
+        case ID_LSTAT_V1:
+            if (!do_lstat_v1(fd, name)) return false;
+            break;
+        case ID_LSTAT_V2:
+        case ID_STAT_V2:
+            if (!do_stat_v2(fd, request.id, name)) return false;
+            break;
+        case ID_LIST:
+            if (!do_list(fd, name)) return false;
+            break;
+        case ID_SEND:
+            if (!do_send(fd, name, buffer)) return false;
+            break;
+        case ID_RECV:
+            if (!do_recv(fd, name, buffer)) return false;
+            break;
+        case ID_QUIT:
+            return false;
+        default:
+            SendSyncFail(fd, StringPrintf("unknown command %08x", request.id));
+            return false;
+    }
+
+    return true;
+}
+
+void file_sync_service(int fd, void*) {
+    std::vector<char> buffer(SYNC_DATA_MAX);
+
+    while (handle_sync_command(fd, buffer)) {
+    }
+
+    D("sync: done");
+    adb_close(fd);
+}