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// Copyright 2018 Mimecast Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "utils.h"
#include <sys/resource.h>
#include <sys/time.h>
void* notnull(void *p, char *file, int line, int count)
{
if (p == NULL) {
Errno("%s:%d count:%d Could not allocate memory", file, line, count);
}
return p;
}
FILE* fnotnull(FILE *fd, const char *path, char *file, int line)
{
if (fd == NULL) {
Errno("%s:%d Could not open file '%s'", file, line, path);
}
return fd;
}
void* mmapok(void *p, char *file, int line)
{
if (p == MAP_FAILED) {
Errno("%s:%d: Mmap failed", file, line);
}
return p;
}
char* strtok2_r(char *str, char *delim, char **saveptr)
{
int len = strlen(delim);
if (str == NULL)
str = *saveptr;
char *next = strstr(str, delim);
if (next) {
next[0] = '\0';
for (int i = 0; i < len; ++i)
next++;
*saveptr = next;
return str;
}
return NULL;
}
void chreplace(char *str, char replace, char with)
{
for (int i = 0; ; ++i) {
if (str[i] == '\0')
break;
if (str[i] == replace)
str[i] = with;
}
}
void strunquote(char *str)
{
int len = strlen(str);
if (str[0] == '"') {
if (str[len-1] == '"')
str[len-1] = '\0';
for (int i = 1; i < len; ++i)
str[i-1] = str[i];
}
}
void set_limits_drop_root(const char *user)
{
if (getuid() == 0) {
struct rlimit rl;
rl.rlim_cur = rl.rlim_max = SET_RLIMIT_NOFILE;
if (0 != setrlimit(RLIMIT_NOFILE, &rl)) {
Errno("Could not set RLIMIT_NOFILE to '%lld'!",
(long long) SET_RLIMIT_NOFILE)
}
rl.rlim_cur = rl.rlim_max = SET_RLIMIT_NPROC;
if (0 != setrlimit(RLIMIT_NPROC, &rl)) {
Errno("Could not set RLIMIT_NPROC to '%lld'!",
(long long) SET_RLIMIT_NPROC)
}
Put("Dropping root privileges to user '%s'", user);
struct passwd *pw = getpwnam(user);
/* process is running as root, drop privileges */
if (setgid(pw->pw_gid) != 0) {
Errno("Unable to drop group privileges!");
}
if (setuid(pw->pw_uid) != 0) {
Errno("Unable to drop user privileges!");
}
}
/*
getrlimit(RLIMIT_NOFILE, &rl);
Put("Max open files: '%lld'", (long long) rl.rlim_cur);
getrlimit(RLIMIT_NPROC, &rl);
Put("Max open processes : '%lld'", (long long) rl.rlim_cur);
*/
}
void get_loadavg_s(char *readbuf)
{
FILE *fp = Fopen("/proc/loadavg", "r");
fgets(readbuf, 128, fp);
char *pos = strchr(readbuf, ' ');
pos[0] = '\0';
fclose(fp);
}
double get_loadavg()
{
// Not thread safe, but multi processing safe
static char buf[128];
get_loadavg_s(buf);
return atof(buf);
}
bool is_number(char *str)
{
for (int i = 0; ; ++i) {
if (str[i] == '\0')
return true;
if (isdigit(str[i]) == 0 && str[i] != '-')
return false;
}
return true;
}
void start_pthread(pthread_t *thread, void*(*cb)(void*), void *data)
{
int rc = pthread_create(thread, NULL, cb, data);
switch (rc) {
case 0:
break;
case EAGAIN:
Error("Out of resources while creating pthread (%d)", rc);
break;
case EINVAL:
Error("Ivalid settings while creating pthread (%d)", rc);
break;
case EPERM:
Error("No permissions to configure pthread (%d)", rc);
default:
Error("Unknown error while creating pthread (%d)", rc);
break;
}
}
void utils_test(void)
{
if (getuid() == 0) {
set_limits_drop_root("nobody");
struct rlimit rl;
getrlimit(RLIMIT_NOFILE, &rl);
assert(rl.rlim_cur == SET_RLIMIT_NOFILE);
assert(rl.rlim_max == SET_RLIMIT_NOFILE);
getrlimit(RLIMIT_NPROC, &rl);
assert(rl.rlim_cur == SET_RLIMIT_NPROC);
assert(rl.rlim_max == SET_RLIMIT_NPROC);
}
}
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