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/**
* Name: eAthena processes monitor
* Original Author: Bartosz Waszak <waszi@evil.org.pl>
* Rewrite Author: Ben Longbons <b.r.longbons@gmail.com>
* License: GPL
* Compilation:
* gcc -o eathena-monitor eathena-monitor.c
*/
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <time.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <signal.h>
#define HOME getenv("HOME")
#define LOGIN_SERVER "./login-server"
#define MAP_SERVER "./map-server"
#define CHAR_SERVER "./char-server"
#define CONFIG "conf/eathena-monitor.conf"
#define LOGFILE "log/eathena-monitor.log"
#define SKIP_BLANK(ptr) ptr += skip_blank(ptr)
static inline size_t skip_blank(const char* ptr) {
size_t i = 0;
while (
(ptr[i] == ' ') ||
(ptr[i] == '\b') ||
(ptr[i] == '\n') ||
(ptr[i] == '\r')
) ptr++;
return i;
}
#define GOTO_EQL(ptr) ptr += goto_eql(ptr)
static inline size_t goto_eql(const char* ptr) {
size_t i = 0;
while (
(ptr[i] != '\0') &&
(ptr[i] != '=') &&
(ptr[i] != '\n') &&
(ptr[i] != '\r')
) ptr++;
return i;
}
#define GOTO_EOL(ptr) ptr += goto_newline(ptr)
static inline size_t goto_newline(const char* ptr) {
size_t i = 0;
while (
(ptr[i] != '\0') &&
(ptr[i] != '\n') &&
(ptr[i] != '\r')
) ptr++;
return i;
}
// initialiized to $HOME/tmwserver
const char *workdir;
//the rest are relative to workdir
const char *login_server = LOGIN_SERVER;
const char *map_server = MAP_SERVER;
const char *char_server = CHAR_SERVER;
const char *logfile = LOGFILE;
// this variable is hard-coded, but the command-line is checked first
const char *config = CONFIG;
pid_t pid_login, pid_map, pid_char;
static
const char* make_path (const char* base, const char* path) {
size_t base_len = strlen(base);
size_t path_len = strlen(path);
char* out = (char *)malloc(base_len + 1 + path_len + 1);
memcpy(out, base, base_len);
out[base_len] = '/';
memcpy(out + base_len + 1, path, path_len);
out[base_len + 1 + path_len] = '\0';
return out;
}
static
void parse_option (char *name, char *value) {
if (!strcasecmp(name, "login_server")) {
login_server = strdup(value);
} else if (!strcasecmp(name, "map_server")) {
map_server = strdup(value);
} else if (!strcasecmp(name, "char_server")) {
char_server = strdup(value);
} else if (!strcasecmp(name, "workdir")) {
workdir = strdup(value);
} else if (!strcasecmp(name, "logfile")) {
logfile = strdup(value);
} else {
fprintf(stderr, "WARNING: ingnoring invalid option '%s' = '%s'\n", name, value);
}
}
static
void read_config(const char *filename) {
FILE *input;
char string[1000];
if (!(input = fopen(filename,"r")) && !(input = fopen (config, "r"))) {
perror("Unable to load config file");
return;
}
while (1) {
if (fgets (string, sizeof (string) - 1, input) == NULL)
break;
char *str = string, *name, *value;
SKIP_BLANK(str);
string[sizeof (string) - 1] = '\0';
if (*str == '#')
continue;
if (*str == '\0')
continue;
name = str;
GOTO_EQL (str);
if (*str != '=') {
continue;
}
*str++ = '\0';
SKIP_BLANK(str);
value = str;
GOTO_EOL(str);
*str = '\0';
parse_option(name, value);
}
fclose (input);
}
static
pid_t start_process(const char *exec) {
const char *args[2] = {exec, NULL};
pid_t pid = fork();
if (pid == -1) {
fprintf(stderr, "Failed to fork");
return 0;
}
if (pid == 0) {
execv(exec, (char**)args);
perror("Failed to exec");
kill(getppid(), SIGABRT);
exit(1);
}
return pid;
}
// Kill all children with the same signal we got, then ourself.
static
void stop_process(int sig) {
if (pid_map) kill(pid_map, sig);
if (pid_login) kill(pid_login, sig);
if (pid_char) kill(pid_char, sig);
signal(sig, SIG_DFL);
raise(sig);
}
int main(int argc, char *argv[]) {
// These are all the signals we are likely to get
// The shell handles stop/cont
signal(SIGTERM, stop_process);
signal(SIGINT, stop_process);
signal(SIGQUIT, stop_process);
signal(SIGABRT, stop_process);
workdir = make_path(HOME, "tmwserver");
read_config(argc>1 ? argv[1] : NULL);
if (chdir(workdir) < 0) perror("Failed to change directory"), exit(1);
printf ("Starting:\n");
printf ("* workdir: %s\n", workdir);
printf ("* login_server: %s\n", login_server);
printf ("* map_server: %s\n", map_server);
printf ("* char_server: %s\n", char_server);
{
//make sure all possible file descriptors are free for use by the servers
//if there are file descriptors higher than the max open from before the limit dropped, that's not our problem
int fd = sysconf(_SC_OPEN_MAX);
while (--fd > 2)
if (close(fd) == 0)
fprintf(stderr, "close fd %d\n", fd);
fd = open("/dev/null", O_RDWR);
if (fd < 0) perror("open /dev/null"), exit(1);
dup2(fd, 0);
dup2(fd, 1);
close(fd);
}
while (1) {
// write stuff to stderr
time_t t = time(NULL);
struct tm *tmp = localtime(&t);
char timestamp[256];
strftime(timestamp, sizeof(timestamp), "%F %T", tmp);
if (!pid_login) {
pid_login = start_process(login_server);
fprintf (stderr, "[%s] forked login server: %lu\n", timestamp, (unsigned long)pid_login);
}
if (!pid_char) {
pid_char = start_process(char_server);
fprintf (stderr, "[%s] forked char server: %lu\n", timestamp, (unsigned long)pid_char);
}
if (!pid_map) {
pid_map = start_process(map_server);
fprintf (stderr, "[%s] forked map server: %lu\n", timestamp, (unsigned long)pid_map);
}
pid_t dead = wait(NULL);
if (dead < 0) perror("Failed to wait for child"), exit(1);
if (pid_login == dead) pid_login = 0;
if (pid_char == dead) pid_char = 0;
if (pid_map == dead) pid_map = 0;
}
}
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