Christopher Tate | d2f5415 | 2011-04-21 12:53:28 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <unistd.h> |
| 18 | #include <stdio.h> |
| 19 | |
| 20 | #include "sysdeps.h" |
| 21 | |
| 22 | #define TRACE_TAG TRACE_ADB |
| 23 | #include "adb.h" |
| 24 | |
| 25 | /* returns the data socket passing the backup data here for forwarding */ |
| 26 | int backup_service(char* args) { |
| 27 | pid_t pid; |
| 28 | int s[2]; |
| 29 | |
| 30 | D("backup_service(%s)\n", args); |
| 31 | |
| 32 | // set up the pipe from the subprocess to here |
| 33 | // parent will read s[0]; child will write s[1] |
| 34 | if (adb_socketpair(s)) { |
| 35 | D("can't create backup socketpair\n"); |
| 36 | fprintf(stderr, "unable to create backup socketpair\n"); |
| 37 | return -1; |
| 38 | } |
| 39 | |
| 40 | // spin off the child process to run the backup command |
| 41 | pid = fork(); |
| 42 | if (pid < 0) { |
| 43 | // failure |
| 44 | D("can't fork for backup\n"); |
| 45 | fprintf(stderr, "unable to fork for backup\n"); |
| 46 | adb_close(s[0]); |
| 47 | adb_close(s[1]); |
| 48 | return -1; |
| 49 | } |
| 50 | |
| 51 | // Great, we're off and running. |
| 52 | if (pid == 0) { |
| 53 | char* p; |
| 54 | int argc; |
| 55 | char** backup_args; |
| 56 | |
| 57 | // child -- actually run the backup here |
| 58 | argc = 1; // room for the basic 'bu' argv[0] |
| 59 | for (p = (char*)args; p && *p; ) { |
| 60 | argc++; |
| 61 | while (*p && *p != ':') p++; |
| 62 | if (*p == ':') p++; |
| 63 | } |
| 64 | |
| 65 | backup_args = (char**) alloca(argc*sizeof(char*) + 1); |
| 66 | backup_args[0] = "bu"; |
| 67 | argc = 1; // run through again to build the argv array |
| 68 | for (p = (char*)args; *p; ) { |
| 69 | backup_args[argc++] = p; |
| 70 | while (*p && *p != ':') p++; |
| 71 | if (*p == ':') { |
| 72 | *p = 0; |
| 73 | p++; |
| 74 | } |
| 75 | } |
| 76 | backup_args[argc] = NULL; |
| 77 | |
| 78 | // Close the half of the socket that we don't care about, route 'bu's console |
| 79 | // to the output socket, and off we go |
| 80 | adb_close(s[0]); |
| 81 | dup2(s[1], STDOUT_FILENO); |
| 82 | |
| 83 | // off we go |
| 84 | execvp("/system/bin/bu", (char * const *)backup_args); |
| 85 | // oops error - close up shop and go home |
| 86 | fprintf(stderr, "Unable to exec 'bu', bailing\n"); |
| 87 | exit(-1); |
| 88 | } else { |
| 89 | // parent, i.e. adbd -- close the sending half of the socket |
| 90 | adb_close(s[1]); |
| 91 | } |
| 92 | |
| 93 | // we'll be reading from s[0] as the data is sent by the child process |
| 94 | return s[0]; |
| 95 | } |