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#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <curl/curl.h>
#include <config.h>
#include <init.h>
#include <log.h>
#include <util.h>
extern int subsystem_handle_term(int pid);
extern int subsystem_count;
int mainpid = 0;
long stack_size = 8192 * 512;
char *token;
/* For some reason, I get SIGSEGV'd when running because a random-ass
byte was inserted where it isnt supposed to be. Added a safety byte
because I cannot be asked to try to figure out how to do this cleanly. */
static unsigned long __1bsafebuf
__attribute__((used)) __attribute__((section(".1bsafebuf.init"))) = 0;
/* We start initcall levels at [1] instead of [0], so we must adjust
in code for this minor design choice. Math is done on the level passed
through i.e. do_initcall_level so that you can call it with (1) and have
the expected initcall (l1_initcall) run. */
extern initcall_entry_t __initcall1_start[];
extern initcall_entry_t __initcall2_start[];
extern initcall_entry_t __initcall3_start[];
extern initcall_entry_t __initcall4_start[];
extern initcall_entry_t __initcall5_start[];
extern initcall_entry_t __initcall_end[];
static initcall_entry_t *initcall_levels[] = {
__initcall1_start,
__initcall2_start,
__initcall3_start,
__initcall4_start,
__initcall5_start,
__initcall_end,
};
static void do_initcall_level(int level)
{
initcall_entry_t *fn;
for (fn = initcall_levels[level - 1];
fn < initcall_levels[level];
fn++)
initcall_from_entry(fn)();
}
static void do_initcalls(void)
{
unsigned long level;
for (level = 1; level < ARRAY_SIZE(initcall_levels); level++) {
do_initcall_level(level);
}
}
static void doenv(char *path)
{
int fd = open(path, O_RDONLY);
if(fd < 0)
return;
struct stat statbuf;
if(fstat(fd, &statbuf) < 0)
return;
char *file_mmap = mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if(file_mmap == NULL)
return;
char *file = malloc(statbuf.st_size + 1);
file[statbuf.st_size + 1] = 0;
memcpy(file, file_mmap, statbuf.st_size);
munmap(file_mmap, statbuf.st_size);
int offset = 0;
while(1) {
char *line = &(file[offset]);
if(*line == '\0')
break;
char *eol = strchrnul(line, '\n');
*eol = '\0';
if(*line == '#')
goto nextline;
char *divider = strchr(line, '=');
if(divider == NULL)
goto nextline;
*divider = '\0';
setenv(line, divider + 1, 0);
print(LOG_DEBUG "env: setting \"%s\" to \"%s\"",
line, divider + 1);
nextline:
offset += (eol - line) + 1;
continue;
}
free(file);
}
int main(void)
{
print("init: Hello world! Running " NAME " v" VERSION "!");
/* set mainpid for the subsystem service so it is fully accessible
during l1 */
mainpid = getpid();
/* set stack_size for subsystem service */
struct rlimit *stack_rlimit = malloc(sizeof(struct rlimit));
getrlimit(RLIMIT_STACK, stack_rlimit);
if(stack_rlimit->rlim_cur != RLIM_INFINITY) {
stack_size = MIN(stack_rlimit->rlim_cur, stack_size);
}
free(stack_rlimit);
/* configure signal handlers early to prevent race condition where subsystems
can terminate main process on accident, and disable Terminated output during
early-mode panic */
static sigset_t set;
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGTERM);
sigprocmask(SIG_BLOCK, &set, NULL);
/* use .env files if present */
doenv(".env");
/* find directory of self and use env from there if it exists */
char *buf = calloc(PATH_MAX, sizeof(char));
ssize_t self_size = readlink("/proc/self/exe", buf, PATH_MAX);
if(self_size + strlen(".env") + 1 > PATH_MAX)
goto skip_self;
char *lastslash = strrchr(buf, '/');
*lastslash = '\0';
char *cwd = get_current_dir_name();
int cwd_is_exec_dir = strcmp(buf, cwd) == 0;
free(cwd);
if(cwd_is_exec_dir)
goto skip_self;
strcat(buf, "/.env");
doenv(buf);
skip_self:
free(buf);
/* fetch token */
char *token_base = getenv("TOKEN");
if(!token_base)
panic("init: cannot find TOKEN in env");
token = calloc(strlen(token_base) + strlen("Authorization: Bot ") + 1,
sizeof(char));
strcpy(token, "Authorization: Bot ");
strcat(token, token_base);
/* init curl */
if(curl_global_init(CURL_GLOBAL_DEFAULT))
panic("init: curl init failed");
/* init random seed */
srand(time(NULL));
/* Rest of the program.. */
do_initcalls();
/* Reaper. Much like init. */
siginfo_t siginfo;
while(subsystem_count > 0) {
sigwaitinfo(&set, &siginfo);
int sig = siginfo.si_signo;
switch(sig) {
case SIGCHLD: ;
int process = 0;
while((process = waitpid(-1, NULL, WNOHANG)) > 0)
if(subsystem_handle_term(process) > 0)
print(LOG_WARNING "init: failed to reap process %d",
process);
if(siginfo.si_status != 0) {
panic("init: process %d exited with non-zero status (%d)", siginfo.si_pid, siginfo.si_status);
}
break;
case SIGINT:
panic("init: keyboard interrupt");
break;
case SIGTERM:
exit(0);
break;
default:
break;
}
}
panic("init: no more subsystems");
}
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