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/*
* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
* Copyright (C) 2017 Matthias Schiffer <mschiffer@universe-factory.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define _GNU_SOURCE
#include "watchdog.h"
#include "sysupgrade.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libubox/blobmsg.h>
void sysupgrade_exec_upgraded(const char *prefix, char *path,
const char *backup, char *command,
struct blob_attr *options)
{
char *wdt_fd = watchdog_fd();
char *argv[] = { "/sbin/upgraded", NULL, NULL, NULL};
struct blob_attr *option;
int rem;
int ret;
ret = chroot(prefix);
if (ret < 0) {
fprintf(stderr, "Failed to chroot for upgraded exec.\n");
return;
}
argv[1] = path;
argv[2] = command;
if (wdt_fd) {
watchdog_set_cloexec(false);
setenv("WDTFD", wdt_fd, 1);
}
if (backup)
setenv("UPGRADE_BACKUP", backup, 1);
blobmsg_for_each_attr(option, options, rem) {
const char *prefix = "UPGRADE_OPT_";
char value[11];
char *name;
char *c;
int tmp;
if (asprintf(&name, "%s%s", prefix, blobmsg_name(option)) <= 0)
continue;
for (c = name + strlen(prefix); *c; c++) {
if (isalnum(*c) || *c == '_') {
*c = toupper(*c);
} else {
c = NULL;
break;
}
}
if (!c) {
fprintf(stderr, "Option \"%s\" contains invalid characters\n",
blobmsg_name(option));
free(name);
continue;
}
switch (blobmsg_type(option)) {
case BLOBMSG_TYPE_INT32:
tmp = blobmsg_get_u32(option);
break;
case BLOBMSG_TYPE_INT16:
tmp = blobmsg_get_u16(option);
break;
case BLOBMSG_TYPE_INT8:
tmp = blobmsg_get_u8(option);
break;
default:
fprintf(stderr, "Option \"%s\" has unsupported type: %d\n",
blobmsg_name(option), blobmsg_type(option));
free(name);
continue;
}
snprintf(value, sizeof(value), "%u", tmp);
setenv(name, value, 1);
free(name);
}
execvp(argv[0], argv);
/* Cleanup on failure */
fprintf(stderr, "Failed to exec upgraded.\n");
unsetenv("WDTFD");
watchdog_set_cloexec(true);
ret = chroot(".");
if (ret < 0) {
fprintf(stderr, "Failed to reset chroot, exiting.\n");
exit(EXIT_FAILURE);
}
}
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