From 3a65bf805e9fdd36725b11ba9f594f7cff66c32b Mon Sep 17 00:00:00 2001 From: Dnomd343 Date: Mon, 26 Sep 2022 20:54:34 +0800 Subject: [PATCH] update: remove legacy process module --- src/process_legacy.c | 214 ------------------------------------------- 1 file changed, 214 deletions(-) delete mode 100644 src/process_legacy.c diff --git a/src/process_legacy.c b/src/process_legacy.c deleted file mode 100644 index 10757f3..0000000 --- a/src/process_legacy.c +++ /dev/null @@ -1,214 +0,0 @@ -#ifndef _GNU_SOURCE -#define _GNU_SOURCE -#endif -#include -#include -#include -#include -#include -#include "constant.h" -#include "flag_legacy.h" - -int exiting = 0; - -pid_t custom_pgid = 0; -pid_t adguard_pid = 0; -pid_t overture_pid = 0; -pid_t domestic_dnsproxy_pid = 0; -pid_t foreign_dnsproxy_pid = 0; - -void get_sub_exit(); -void server_daemon(); -void get_exit_signal(); -void server_exit(int exit_code); -pid_t process_exec(char **command, int is_new_group); -void init_server(char *init_script, char *custom_script); - -void get_exit_signal() { // get SIGINT or SIGTERM signal - fprintf(stderr, "[ClearDNS] Get exit signal.\n"); - server_exit(EXIT_NORMAL); -} - -void server_exit(int exit_code) { // kill sub process and exit - int status, ret; - exiting = 1; // set a exit flag - - if (adguard_pid != 0) { - fprintf(stderr, "[ClearDNS] Kill AdGuardHome. (pid = %d)\n", adguard_pid); - kill(adguard_pid, SIGTERM); - } - if (overture_pid != 0) { - fprintf(stderr, "[ClearDNS] Kill overture. (pid = %d)\n", overture_pid); - kill(overture_pid, SIGTERM); - } - if (domestic_dnsproxy_pid != 0) { - fprintf(stderr, "[ClearDNS] Kill domestic dnsproxy. (pid = %d)\n", domestic_dnsproxy_pid); - kill(domestic_dnsproxy_pid, SIGTERM); - } - if (foreign_dnsproxy_pid != 0) { - fprintf(stderr, "[ClearDNS] Kill foreign dnsproxy. (pid = %d)\n", foreign_dnsproxy_pid); - kill(foreign_dnsproxy_pid, SIGTERM); - } - - ret = waitpid(adguard_pid, &status, 0); // blocking - fprintf(stderr, "[ClearDNS] AdGuardHome exit. (pid = %d)\n", ret); - - ret = waitpid(overture_pid, &status, 0); // blocking - fprintf(stderr, "[ClearDNS] overture exit. (pid = %d)\n", ret); - - ret = waitpid(domestic_dnsproxy_pid, &status, 0); // blocking - fprintf(stderr, "[ClearDNS] domestic dnsproxy exit. (pid = %d)\n", ret); - - ret = waitpid(foreign_dnsproxy_pid, &status, 0); // blocking - fprintf(stderr, "[ClearDNS] foreign dnsproxy exit. (pid = %d)\n", ret); - - if (custom_pgid != 0) { - ret = waitpid(-custom_pgid, &status, WNOHANG); - if (ret == 0) { // custom script still running - fprintf(stderr, "[ClearDNS] Kill custom script. (pgid = %d)\n", custom_pgid); - kill(-custom_pgid, SIGTERM); // kill process group - } - } - - fprintf(stderr, "[ClearDNS] Kill all subprocess.\n"); - kill(-1, SIGTERM); // send kill signal to all process - while ((ret = wait(&status)) != -1) { - fprintf(stderr, "[ClearDNS] Subprocess exit. (pid = %d)\n", ret); - } - - fprintf(stderr, "[ClearDNS] Exit successfully.\n"); - exit(exit_code); -} - -void get_sub_exit() { // catch child process exit - int ret, status; - int wait_time = 3; // seconds for wait before restart - if (exiting) { return; } // server daemon is exiting - - if (adguard_pid != 0) { // check AdGuardHome - ret = waitpid(adguard_pid, &status, WNOHANG); // non-blocking - if (ret == -1) { - perror("[ClearDNS] Waitpid error"); - server_exit(EXIT_WAIT_ERROR); - } else if (ret) { // process exit - adguard_pid = process_exec(adguard_command, FALSE); - fprintf(stderr, "[ClearDNS] Catch AdGuardHome exit and restart it. (pid = %d -> %d)\n", ret, adguard_pid); - sleep(wait_time); // reduce restart frequency - return; - } - } - - if (overture_pid != 0) { // check overture - ret = waitpid(overture_pid, &status, WNOHANG); // non-blocking - if (ret == -1) { - perror("[ClearDNS] Waitpid error"); - server_exit(EXIT_WAIT_ERROR); - } else if (ret) { // process exit - overture_pid = process_exec(overture_command, FALSE); - fprintf(stderr, "[ClearDNS] Catch overture exit and restart it. (pid = %d -> %d)\n", ret, overture_pid); - sleep(wait_time); // reduce restart frequency - return; - } - } - - if (domestic_dnsproxy_pid != 0) { // check domestic dnsproxy - ret = waitpid(domestic_dnsproxy_pid, &status, WNOHANG); // non-blocking - if (ret == -1) { - perror("[ClearDNS] Waitpid error"); - server_exit(EXIT_WAIT_ERROR); - } else if (ret) { // process exit - domestic_dnsproxy_pid = process_exec(domestic_dnsproxy_command, FALSE); - fprintf(stderr, "[ClearDNS] Catch domestic dnsproxy exit and restart it. (pid = %d -> %d)\n", ret, domestic_dnsproxy_pid); - sleep(wait_time); // reduce restart frequency - return; - } - } - - if (foreign_dnsproxy_pid != 0) { // check foreign dnsproxy - ret = waitpid(foreign_dnsproxy_pid, &status, WNOHANG); // non-blocking - if (ret == -1) { - perror("[ClearDNS] Waitpid error"); - server_exit(EXIT_WAIT_ERROR); - } else if (ret) { // process exit - foreign_dnsproxy_pid = process_exec(foreign_dnsproxy_command, FALSE); - fprintf(stderr, "[ClearDNS] Catch foreign dnsproxy exit and restart it. (pid = %d -> %d)\n", ret, foreign_dnsproxy_pid); - sleep(wait_time); // reduce restart frequency - return; - } - } - - ret = waitpid(-1, &status, WNOHANG); // waitpid for all sub-process (non-blocking) - if (ret == -1) { - perror("[ClearDNS] Waitpid error"); - server_exit(EXIT_WAIT_ERROR); - } else if (ret) { // process exit - fprintf(stderr, "[ClearDNS] Catch subprocess exit. (pid = %d)\n", ret); - return; - } - fprintf(stderr, "[ClearDNS] Subprocess not found.\n"); // get SIGCHLD signal but not exited subprocess found -} - -pid_t process_exec(char **command, int is_new_group) { - pid_t pid; - char **env = {NULL}; - if ((pid = fork()) < 0) { - perror("[ClearDNS] Fork error"); - server_exit(EXIT_FORK_ERROR); - } else if (pid == 0) { // child process - if (is_new_group) { setpgrp(); } // new process group - prctl(PR_SET_PDEATHSIG, SIGKILL); // child process die with father process - if (execvpe(command[0], command, env) < 0) { - perror("[ClearDNS] Exec error"); - server_exit(EXIT_EXEC_ERROR); - } - } - return pid; -} - -void init_server(char *init_script, char *custom_script) { // run init script (blocking) / custom script (non-blocking) - int pid, status; - char *crond_command[] = {"crond", NULL}; - char *init_command[] = {"sh", init_script, NULL}; - char *custom_command[] = {"sh", custom_script, NULL}; - - fprintf(stderr, "[ClearDNS] Start init process.\n"); - pid = process_exec(init_command, FALSE); - wait(&status); // blocking wait - fprintf(stderr, "[ClearDNS] Init complete. (pid = %d)\n", pid); // init process - - signal(SIGINT, get_exit_signal); // catch Ctrl + C (2) - signal(SIGTERM, get_exit_signal); // catch exit signal (15) - signal(SIGCHLD, get_sub_exit); // callback when child process die - - pid = process_exec(crond_command, FALSE); - fprintf(stderr, "[ClearDNS] Crond load success. (pid = %d)\n", pid); // crond process - - if (access(custom_script, F_OK) >= 0) { // custom script exist - custom_pgid = process_exec(custom_command, TRUE); - fprintf(stderr, "[ClearDNS] Custom script is working. (pgid = %d)\n", custom_pgid); // custom process - usleep(200000); // wait a moment (200ms) - } -} - -void server_daemon() { // run as a daemon of ClearDNS - int wait_us_time = 200000; // 200ms - - adguard_pid = process_exec(adguard_command, FALSE); - fprintf(stderr, "[ClearDNS] Exec AdGuardHome. (pid = %d)\n", adguard_pid); - usleep(wait_us_time); - - overture_pid = process_exec(overture_command, FALSE); - fprintf(stderr, "[ClearDNS] Exec overture. (pid = %d)\n", overture_pid); - usleep(wait_us_time); - - domestic_dnsproxy_pid = process_exec(domestic_dnsproxy_command, FALSE); - fprintf(stderr, "[ClearDNS] Exec domestic dnsproxy. (pid = %d)\n", domestic_dnsproxy_pid); - usleep(wait_us_time); - - foreign_dnsproxy_pid = process_exec(foreign_dnsproxy_command, FALSE); - fprintf(stderr, "[ClearDNS] Exec foreign dnsproxy. (pid = %d)\n", foreign_dnsproxy_pid); - usleep(wait_us_time); - - GMainLoop *main_loop = g_main_loop_new(NULL, FALSE); - g_main_loop_run(main_loop); -}