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Implemented daemon

This commit is contained in:
Mark Qvist 2020-05-27 10:30:02 +02:00
parent 6bdf096f08
commit 6b5f7a50d9
1 changed files with 79 additions and 9 deletions
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70
tncattach.c
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@ -3,6 +3,8 @@
#include <signal.h>
#include <poll.h>
#include <argp.h>
#include <syslog.h>
#include <sys/stat.h>
#include "Constants.h"
#include "Serial.h"
#include "KISS.h"
@ -42,9 +44,15 @@ void cleanup(void) {
}
void signal_handler(int signal) {
if (daemonize) {
cleanup();
syslog(LOG_NOTICE, "tncattach daemon exiting");
exit(0);
} else {
cleanup();
exit(0);
}
}
bool is_ipv6(uint8_t* frame) {
if (device_type == IF_TAP) {
@ -73,8 +81,13 @@ void read_loop(void) {
min_frame_size = ETHERNET_MIN_FRAME_SIZE;
} else if (device_type == IF_TUN) {
min_frame_size = TUN_MIN_FRAME_SIZE;
} else {
if (daemonize) {
syslog(LOG_ERR, "Unsupported interface type");
} else {
printf("Error: Unsupported interface type\r\n");
}
cleanup();
exit(1);
}
@ -88,12 +101,20 @@ void read_loop(void) {
// Check for hangup event
if (fds[fdi].revents & POLLHUP) {
if (fdi == IF_FD_INDEX) {
if (daemonize) {
syslog(LOG_ERR, "Received hangup from interface");
} else {
printf("Received hangup from interface\r\n");
}
cleanup();
exit(1);
}
if (fdi == TNC_FD_INDEX) {
if (daemonize) {
syslog(LOG_ERR, "Received hangup from TNC");
} else {
printf("Received hangup from TNC\r\n");
}
cleanup();
exit(1);
}
@ -102,12 +123,20 @@ void read_loop(void) {
// Check for error event
if (fds[fdi].revents & POLLERR) {
if (fdi == IF_FD_INDEX) {
if (daemonize) {
syslog(LOG_ERR, "Received error event from interface");
} else {
perror("Received error event from interface\r\n");
}
cleanup();
exit(1);
}
if (fdi == TNC_FD_INDEX) {
if (daemonize) {
syslog(LOG_ERR, "Received error event from TNC");
} else {
perror("Received error event from TNC\r\n");
}
cleanup();
exit(1);
}
@ -123,8 +152,12 @@ void read_loop(void) {
kiss_write_frame(attached_tnc, if_buffer, if_len);
}
}
} else {
if (daemonize) {
syslog(LOG_ERR, "Could not read from network interface, exiting now");
} else {
printf("Error: Could not read from network interface, exiting now\r\n");
}
cleanup();
exit(1);
}
@ -137,8 +170,13 @@ void read_loop(void) {
for (int i = 0; i < tnc_len; i++) {
kiss_serial_read(serial_buffer[i]);
}
} else {
if (daemonize) {
syslog(LOG_ERR, "Could not read from TNC, exiting now");
} else {
printf("Error: Could not read from TNC, exiting now\r\n");
}
cleanup();
exit(1);
}
@ -363,6 +401,34 @@ static error_t parse_opt(int key, char *arg, struct argp_state *state) {
return 0;
}
static void become_daemon() {
pid_t pid;
pid = fork();
if (pid < 0) {
perror("Fork failed");
exit(EXIT_FAILURE);
}
if (pid > 0) {
exit(0);
}
if (setsid() < 0) exit(1);
signal(SIGCHLD, signal_handler);
signal(SIGHUP, signal_handler);
pid = fork();
if (pid < 0) exit(1);
if (pid > 0) exit(0);
umask(0);
chdir("/");
openlog("tncattach", LOG_PID, LOG_DAEMON);
}
static struct argp argp = {options, parse_opt, args_doc, doc};
int main(int argc, char **argv) {
struct arguments arguments;
@ -398,6 +464,10 @@ int main(int argc, char **argv) {
fds[IF_FD_INDEX].events = POLLIN;
fds[TNC_FD_INDEX].fd = attached_tnc;
fds[TNC_FD_INDEX].events = POLLIN;
if (daemonize) {
become_daemon();
syslog(LOG_NOTICE, "tncattach daemon running");
}
read_loop();
}