1 // Copyright 2019 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 // This file is an example of a binary which is intended to be sandboxed by the
16 // sandbox2. It's not google3-based, and compiled statically (see BUILD).
17 //
18 // It inverts all bytes coming from stdin and writes them to the stdout.
19
20 #include <sys/prctl.h>
21 #include <unistd.h>
22
23 #include <cctype>
24 #include <cstdio>
25
main(int argc,char * argv[])26 int main(int argc, char* argv[]) {
27 char buf[1024];
28 size_t total_bytes = 0U;
29
30 prctl(PR_SET_NAME, "static_bin");
31
32 fprintf(stderr, "=============================\n");
33 fprintf(stderr, "Starting file capitalization\n");
34 fprintf(stderr, "=============================\n");
35 fflush(nullptr);
36
37 for (;;) {
38 ssize_t sz = read(STDIN_FILENO, buf, sizeof(buf));
39 if (sz < 0) {
40 perror("read");
41 break;
42 }
43 if (sz == 0) {
44 break;
45 }
46 for (int i = 0; i < sz; i++) {
47 buf[i] = toupper(buf[i]);
48 }
49 write(STDOUT_FILENO, buf, sz);
50 total_bytes += sz;
51 }
52
53 fprintf(stderr, "=============================\n");
54 fprintf(stderr, "Converted: %zu bytes\n", total_bytes);
55 fprintf(stderr, "=============================\n");
56 fflush(nullptr);
57 return 0;
58 }
59