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/*
* tlsdate-monitor.c - tlsdated monitor for tlsdate.
* Copyright (c) 2013 The Chromium 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 "config.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include "src/util.h"
#include "src/tlsdate.h"
static
char **
build_argv (struct opts *opts)
{
int argc;
char **new_argv;
assert (opts->sources);
/* choose the next source in the list; if we're at the end, start over. */
if (!opts->cur_source || !opts->cur_source->next)
opts->cur_source = opts->sources;
else
opts->cur_source = opts->cur_source->next;
for (argc = 0; opts->base_argv[argc]; argc++)
;
/* Put an arbitrary limit on the number of args. */
if (argc > 1024)
return NULL;
argc++; /* uncounted null terminator */
argc += 9; /* -H host -p port -x proxy -Vraw -n -l */
new_argv = malloc (argc * sizeof (char *));
if (!new_argv)
return NULL;
for (argc = 0; opts->base_argv[argc]; argc++)
new_argv[argc] = opts->base_argv[argc];
new_argv[argc++] = "-H";
new_argv[argc++] = opts->cur_source->host;
new_argv[argc++] = "-p";
new_argv[argc++] = opts->cur_source->port;
if (opts->cur_source->proxy || opts->proxy)
{
char *proxy = opts->proxy ? opts->proxy : opts->cur_source->proxy;
if (strcmp (proxy, ""))
{
new_argv[argc++] = (char *) "-x";
new_argv[argc++] = proxy;
}
}
new_argv[argc++] = "-Vraw";
new_argv[argc++] = "-n";
if (opts->leap)
new_argv[argc++] = "-l";
new_argv[argc++] = NULL;
return new_argv;
}
/* Run tlsdate and redirects stdout to the monitor_fd */
int
tlsdate (struct state *state)
{
char **new_argv;
pid_t pid;
switch ((pid = fork()))
{
case 0: /* child! */
break;
case -1:
perror ("fork() failed!");
return -1;
default:
verb_debug ("[tlsdate-monitor] spawned tlsdate: %d", pid);
state->tlsdate_pid = pid;
return 0;
}
if (!(new_argv = build_argv (&state->opts)))
fatal ("out of memory building argv");
/* Replace stdout with the pipe back to tlsdated */
if (dup2 (state->tlsdate_monitor_fd, STDOUT_FILENO) < 0)
{
perror ("dup2 failed");
_exit (2);
}
execve (new_argv[0], new_argv, state->envp);
perror ("[tlsdate-monitor] execve() failed");
_exit (1);
}
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