| /* |
| * Copyright 2013 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include "futility.h" |
| |
| #define MYNAME "futility" |
| #define MYNAME_S MYNAME "_s" |
| |
| /* File to use for logging, if present */ |
| #define LOGFILE "/tmp/futility.log" |
| |
| /* Normally logging will only happen if the logfile already exists. Uncomment |
| * this to force log file creation (and thus logging) always. */ |
| /* #define FORCE_LOGGING_ON */ |
| |
| /******************************************************************************/ |
| |
| static const char *const usage = "\n\ |
| Usage: " MYNAME " PROGRAM|COMMAND [args...]\n\ |
| \n\ |
| This is the unified firmware utility, which will eventually replace\n\ |
| most of the distinct verified boot tools formerly produced by the\n\ |
| vboot_reference package.\n\ |
| \n\ |
| When symlinked under the name of one of those previous tools, should\n\ |
| fully implement the original behavior. It can also be invoked directly\n\ |
| as " MYNAME ", followed by the original name as the first argument.\n\ |
| \n\ |
| In either case it will append some usage information to " LOGFILE "\n\ |
| (iff that file exists), to help improve coverage and correctness.\n\ |
| \n"; |
| |
| static int do_help(int argc, char *argv[]) |
| { |
| const struct futil_cmd_t *const *cmd; |
| int i; |
| |
| fputs(usage, stdout); |
| |
| printf("The following commands are built-in:\n\n"); |
| |
| for (cmd = futil_cmds; *cmd; cmd++) |
| printf(" %-20s %s\n", (*cmd)->name, (*cmd)->shorthelp); |
| printf("\n"); |
| |
| if (argc) { |
| printf("FYI, you added these args that I'm ignoring:\n"); |
| for (i = 0; i < argc; i++) |
| printf("argv[%d] = %s\n", i, argv[i]); |
| } |
| |
| return 0; |
| } |
| |
| DECLARE_FUTIL_COMMAND(help, do_help, |
| "Show a bit of help (you're looking at it)"); |
| |
| /* |
| * These are built-in functions that we'd like to abandon completely someday. |
| * TODO: If no one complains, get rid of them. |
| */ |
| static const char *const dep_cmds[] = { |
| "dev_sign_file", |
| }; |
| |
| static const char *const dep_usage = "\n\ |
| The program \"%s\" is deprecated and may go away soon.\n\ |
| \n\ |
| If you feel this is in error, please open a bug at\n\ |
| \n\ |
| http://dev.chromium.org/for-testers/bug-reporting-guidelines\n\ |
| \n\ |
| In the meantime, you may continue to use the program by invoking it as\n\ |
| \n\ |
| " MYNAME " %s [...]\n\ |
| \n"; |
| |
| static void deprecated(const char *depname) |
| { |
| fprintf(stderr, dep_usage, depname, depname); |
| exit(1); |
| } |
| |
| /******************************************************************************/ |
| /* Logging stuff */ |
| |
| static int log_fd = -1; |
| |
| /* Write the string and a newline. Silently give up on errors */ |
| static void log_str(char *str) |
| { |
| int len, done, n; |
| |
| if (log_fd < 0) |
| return; |
| |
| if (!str) |
| str = "(NULL)"; |
| |
| len = strlen(str); |
| if (len == 0) { |
| str = "(EMPTY)"; |
| len = strlen(str); |
| } |
| |
| for (done = 0; done < len; done += n) { |
| n = write(log_fd, str + done, len - done); |
| if (n < 0) |
| return; |
| } |
| |
| if (write(log_fd, "\n", 1) < 0) |
| return; |
| } |
| |
| static void log_close(void) |
| { |
| struct flock lock; |
| |
| if (log_fd >= 0) { |
| memset(&lock, 0, sizeof(lock)); |
| lock.l_type = F_UNLCK; |
| lock.l_whence = SEEK_SET; |
| if (fcntl(log_fd, F_SETLKW, &lock)) |
| perror("Unable to unlock log file"); |
| |
| close(log_fd); |
| log_fd = -1; |
| } |
| } |
| |
| static void log_open(void) |
| { |
| struct flock lock; |
| int ret; |
| |
| #ifdef FORCE_LOGGING_ON |
| log_fd = open(LOGFILE, O_WRONLY | O_APPEND | O_CREAT, 0666); |
| #else |
| log_fd = open(LOGFILE, O_WRONLY | O_APPEND); |
| #endif |
| if (log_fd < 0) { |
| |
| if (errno != EACCES) |
| return; |
| |
| /* Permission problems should improve shortly ... */ |
| sleep(1); |
| log_fd = open(LOGFILE, O_WRONLY | O_APPEND | O_CREAT, 0666); |
| if (log_fd < 0) /* Nope, they didn't */ |
| return; |
| } |
| |
| /* Let anyone have a turn */ |
| fchmod(log_fd, 0666); |
| |
| /* But only one at a time */ |
| memset(&lock, 0, sizeof(lock)); |
| lock.l_type = F_WRLCK; |
| lock.l_whence = SEEK_END; |
| |
| ret = fcntl(log_fd, F_SETLKW, &lock); /* this blocks */ |
| if (ret < 0) |
| log_close(); |
| } |
| |
| #define CALLER_PREFIX "CALLER:" |
| static void log_args(int argc, char *argv[]) |
| { |
| int i; |
| ssize_t r; |
| pid_t parent; |
| char buf[80]; |
| char str_caller[PATH_MAX + sizeof(CALLER_PREFIX)] = CALLER_PREFIX; |
| char *truename = str_caller + sizeof(CALLER_PREFIX) - 1; |
| /* Note: truename starts on the \0 from CALLER_PREFIX, so we can write |
| * PATH_MAX chars into truename and still append a \0 at the end. */ |
| |
| log_open(); |
| |
| /* delimiter */ |
| log_str("##### HEY #####"); |
| |
| /* Can we tell who called us? */ |
| parent = getppid(); |
| snprintf(buf, sizeof(buf), "/proc/%d/exe", parent); |
| r = readlink(buf, truename, PATH_MAX); |
| if (r >= 0) { |
| truename[r] = '\0'; |
| log_str(str_caller); |
| } |
| |
| /* Now log the stuff about ourselves */ |
| for (i = 0; i < argc; i++) |
| log_str(argv[i]); |
| |
| log_close(); |
| } |
| |
| /******************************************************************************/ |
| /* Here we go */ |
| |
| int main(int argc, char *argv[], char *envp[]) |
| { |
| char *fullname, *progname; |
| char truename[PATH_MAX]; |
| char buf[80]; |
| pid_t myproc; |
| ssize_t r; |
| const struct futil_cmd_t *const *cmd; |
| int i; |
| int via_symlink = 0; |
| |
| log_args(argc, argv); |
| |
| /* How were we invoked? */ |
| fullname = strdup(argv[0]); |
| progname = strrchr(argv[0], '/'); |
| if (progname) |
| progname++; |
| else |
| progname = argv[0]; |
| |
| /* Invoked directly by name */ |
| if (0 == strcmp(progname, MYNAME) || 0 == strcmp(progname, MYNAME_S)) { |
| if (argc < 2) { /* must have an argument */ |
| do_help(0, 0); |
| exit(1); |
| } |
| |
| /* We can just pass the rest along, then */ |
| argc--; |
| argv++; |
| |
| /* So now what function do we want to invoke? */ |
| progname = strrchr(argv[0], '/'); |
| if (progname) |
| progname++; |
| else |
| progname = argv[0]; |
| } else { /* Invoked by symlink */ |
| via_symlink = 1; |
| /* Block any deprecated functions. */ |
| for (i = 0; i < ARRAY_SIZE(dep_cmds); i++) |
| if (0 == strcmp(dep_cmds[i], progname)) |
| deprecated(progname); |
| } |
| |
| /* See if it's asking for something we know how to do ourselves */ |
| for (cmd = futil_cmds; *cmd; cmd++) |
| if (0 == strcmp((*cmd)->name, progname)) |
| return (*cmd)->handler(argc, argv); |
| |
| /* Nope */ |
| if (!via_symlink) { |
| do_help(0, 0); |
| exit(1); |
| } |
| |
| /* Complain about bogus symlink */ |
| |
| myproc = getpid(); |
| snprintf(buf, sizeof(buf), "/proc/%d/exe", myproc); |
| r = readlink(buf, truename, PATH_MAX - 1); |
| if (r < 0) { |
| fprintf(stderr, "%s is lost: %s => %s: %s\n", MYNAME, argv[0], |
| buf, strerror(errno)); |
| exit(1); |
| } |
| truename[r] = '\0'; |
| |
| fprintf(stderr, "\n\ |
| The program\n\n %s\n\nis a symlink to\n\n %s\n\ |
| \n\ |
| However, " MYNAME " doesn't know how to implement that function.\n\ |
| \n\ |
| This is probably an error in your installation. If the problem persists\n\ |
| after a fresh checkout/build/install, please open a bug at\n\ |
| \n\ |
| http://dev.chromium.org/for-testers/bug-reporting-guidelines\n\ |
| \n", fullname, truename); |
| return 1; |
| } |