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#include <sys/socket.h>
#include <sys/un.h>
#include <ctype.h>
#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
int connfd;
const char *sockpath;
char notifypath[PATH_MAX];
volatile sig_atomic_t timed_out;
enum process_state {
PROC_DOWN = 1,
PROC_SETUP,
PROC_STARTING,
PROC_UP,
PROC_ONESHOT,
PROC_SHUTDOWN,
PROC_RESTART,
PROC_FATAL,
PROC_DELAY,
};
void
noop()
{
timed_out = 1;
}
void
cleanup_notify()
{
unlink(notifypath);
}
void
notifysock(const char *service)
{
static char default_sock[] = "/run/nitro/nitro.sock";
char *path = strdup(sockpath);
if (!path || !*path)
path = default_sock;
snprintf(notifypath, sizeof notifypath,
"%s/notify/%s,%ld", dirname(path), service, (long)getpid());
struct sockaddr_un my_addr = { 0 };
my_addr.sun_family = AF_UNIX;
strncpy(my_addr.sun_path, notifypath, sizeof my_addr.sun_path - 1);
again:
if (bind(connfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
if (errno == EADDRINUSE) {
// ok to delete this, only we can have the current pid.
if (unlink(notifypath) == 0)
goto again;
}
perror("bind");
exit(111);
}
atexit(cleanup_notify);
struct sockaddr_un addr = { 0 };
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, sockpath, sizeof addr.sun_path - 1);
if (connect(connfd, (struct sockaddr *)&addr, sizeof addr) < 0) {
fprintf(stderr, "nitroctl: could not connect to '%s', is nitro started?\n", sockpath);
exit(111);
}
}
int
send_and_wait(char cmd, const char *service)
{
notifysock(service);
dprintf(connfd, "%c%s", cmd, service);
struct sigaction sa = {
.sa_handler = noop,
.sa_flags = 0,
};
sigaction(SIGALRM, &sa, 0);
alarm(5);
while(!timed_out) {
ssize_t rd;
char buf[64];
rd = read(connfd, buf, sizeof buf); /* block */
if (rd < 0) {
if (errno == EINTR)
continue;
perror("read");
exit(111);
}
buf[rd] = 0;
int state = 0;
if (buf[0] >= 'A' && buf[0] <= 'Z')
state = buf[0] - 64;
if (buf[0] == 'e') {
fprintf(stderr, "nitroctl: no such service '%s'\n", service);
return 111;
}
switch (cmd) {
case 'u':
case 'r':
if (state == PROC_UP || state == PROC_ONESHOT)
return 0;
if (state == PROC_FATAL) {
fprintf(stderr,
"nitroctl: failed to %sstart '%s'\n", service, cmd == 'u' ? "" : "re");
return 1;
}
break;
case 'd':
if (state == PROC_DOWN || state == PROC_FATAL)
return 0;
break;
}
}
fprintf(stderr, "nitroctl: action timed out\n");
return 2;
}
char *
normalize(char *service)
{
if (!service || (service[0] != '/' && service[0] != '.'))
return service;
char *buf = realpath(service, 0);
if (!buf) {
fprintf(stderr, "nitroctl: no such service: %s: %m\n", service);
exit(1);
}
char *end = strrchr(buf, '/');
if (strcmp(end, "/log") == 0)
while(end > buf && *--end != '/')
;
return end + 1;
}
int
main(int argc, char *argv[])
{
if (argc < 2 || (
strcmp(argv[1], "l") != 0 && strcmp(argv[1], "list") != 0 &&
strcmp(argv[1], "d") != 0 && strcmp(argv[1], "down") != 0 &&
strcmp(argv[1], "u") != 0 && strcmp(argv[1], "up") != 0 &&
strcmp(argv[1], "p") != 0 && strcmp(argv[1], "pause") != 0 &&
strcmp(argv[1], "c") != 0 && strcmp(argv[1], "cont") != 0 &&
strcmp(argv[1], "h") != 0 && strcmp(argv[1], "hup") != 0 &&
strcmp(argv[1], "a") != 0 && strcmp(argv[1], "alarm") != 0 &&
strcmp(argv[1], "i") != 0 && strcmp(argv[1], "interrupt") != 0 &&
strcmp(argv[1], "q") != 0 && strcmp(argv[1], "quit") != 0 &&
strcmp(argv[1], "t") != 0 && strcmp(argv[1], "term") != 0 &&
strcmp(argv[1], "k") != 0 && strcmp(argv[1], "kill") != 0 &&
strcmp(argv[1], "1") != 0 &&
strcmp(argv[1], "2") != 0 &&
strcmp(argv[1], "check") != 0 &&
strcmp(argv[1], "start") != 0 &&
strcmp(argv[1], "r") != 0 && strcmp(argv[1], "restart") != 0 &&
strcmp(argv[1], "stop") != 0 &&
strcmp(argv[1], "Reboot") != 0 &&
strcmp(argv[1], "Shutdown") != 0)) {
dprintf(2, "usage: nitroctl COMMAND [SERVICE]\n");
exit(2);
}
static const char default_sock[] = "/run/nitro/nitro.sock";
sockpath = getenv("NITRO_SOCK");
if (!sockpath || !*sockpath)
sockpath = default_sock;
connfd = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (connfd < 0) {
perror("socket");
exit(111);
}
char cmd = argv[1][0];
char *service = normalize(argv[2]);
if (strcmp(argv[1], "start") == 0 && service)
return send_and_wait('u', service);
else if (strcmp(argv[1], "stop") == 0 && service)
return send_and_wait('d', service);
else if (strcmp(argv[1], "restart") == 0 && service)
return send_and_wait('r', service);
else if (strcmp(argv[1], "check") == 0 && service)
cmd = '?';
notifysock("");
dprintf(connfd, "%c%s", cmd, service ? service : "");
int status = 1;
ssize_t rd;
char buf[4096];
rd = read(connfd, buf, sizeof buf);
if (rd < 0) {
perror("read");
exit(111);
}
if (rd > 0)
status = 0;
write(1, buf, rd);
return status;
}
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