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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <assert.h>
#include <sodium.h>
#include "broadcast.h"
#include "command.h"
#include "conn_data.h"
#include "db.h"
#include "event.h"
#include "firebase.h"
#include "net.h"
#include "plugin.h"
#include "runloop.h"
#include "user_data.h"
#include "hashtable.h"
#define PORT (29536) // python: int("msg",36)
static int create_server_socket(void){
int sock=socket(AF_INET,SOCK_STREAM,0);
if(sock<0)die_perror("socket");
int one=1;
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&one,sizeof one);
struct sockaddr_in name;
name.sin_family=AF_INET;
name.sin_addr.s_addr=htonl(INADDR_ANY);
name.sin_port=htons(PORT);
if(bind(sock,(struct sockaddr*)&name,sizeof name)<0)die_perror("bind");
if(listen(sock,16)<0)die_perror("listen");
return sock;
}
static struct hashtable *conn_hash = NULL;
static void conn_hash_init(void) {
conn_hash = ht_alloc();
}
static void add_conn_data(int fd, struct conn_data *item) {
ht_insert(conn_hash, fd, item);
}
static struct conn_data* find_conn_data(int fd){
struct conn_data *item = (struct conn_data*)ht_find(conn_hash, fd);
assert(item);
return item;
}
static void delete_conn_data(int fd){
debug("Deleting conn_data for fd=%d",fd);
struct conn_data *item = find_conn_data(fd);
if (item->userid != -1) {
userdata_unregister(item->userid, fd);
broadcast_online_change(item->userid);
}
conn_data_nullify(item);
free(item);
ht_delete(conn_hash, fd);
}
static bool client_socket_callback(int fd){
struct conn_data *data=find_conn_data(fd);
if(data->bufsz-data->buflen<256){
data->bufsz*=2;
data->buffer=realloc(data->buffer,data->bufsz,char);
}
ssize_t ret;
do ret=read(fd,data->buffer+data->buflen,data->bufsz-data->buflen);
while(ret<0&&errno==EINTR);
if(ret==0||(ret<0&&(errno==ECONNRESET||errno==ETIMEDOUT))){
delete_conn_data(fd);
close(fd);
return true;
}
if(ret<0)die_perror("read");
data->buflen+=ret;
while(true){
char *lfp=memchr(data->buffer,'\n',data->buflen);
if(lfp==NULL)break;
size_t length=lfp-data->buffer;
bool should_close=handle_input_line(data,data->buffer,length);
memmove(data->buffer,lfp+1,data->buflen-length-1);
data->buflen-=length+1;
if(should_close){
delete_conn_data(fd);
close(fd);
return true;
}
}
return false;
}
static bool server_socket_callback(int fd){
int sock;
do sock=accept(fd,NULL,NULL);
while(sock<0&&errno==EINTR);
if(sock<0)die_perror("accept");
runloop_add_fd(sock,client_socket_callback,true);
struct conn_data *item = malloc(1, struct conn_data);
conn_data_init(item, sock);
add_conn_data(sock, item);
debug("Added conn_data for fd=%d",sock);
return false;
}
static bool timeout_callback(int fd){
// Note: this does not check the protocol version. If the protocol changes
// significantly regarding push messages, perhaps that should change.
return net_send_raw_text(fd,"_push ping\n",11);
}
#ifndef __APPLE__
static void srandomdev(void){
FILE *f=fopen("/dev/urandom","r");
assert(f);
unsigned int seed;
size_t nread=fread(&seed,1,sizeof(seed),f);
assert(nread==sizeof(seed));
fclose(f);
srandom(seed);
}
#endif
static void signal_handler(int sig){
if(sig==SIGPIPE){
// ignore
}
}
static bool constructors_work = false;
__attribute__((constructor))
static void constructor(void) { constructors_work = true; }
int main(int argc,char **argv){
if (!constructors_work) {
fprintf(stderr, "This platform does not support application constructors, which tomsg requires\n");
return 1;
}
srandomdev();
if(sodium_init()<0){
fprintf(stderr,"Could not initialise libsodium!\n");
return 1;
}
signal(SIGPIPE,signal_handler);
conn_hash_init();
plugin_init();
for(int i=1;i<argc;i++){
plugin_register(argv[i]);
}
if(argc<=1)printf("Loaded no plugins\n");
db_init();
firebase_init();
int sock=create_server_socket();
printf("Listening on port %d\n",PORT);
runloop_set_timeout(60*1000000,timeout_callback);
runloop_add_fd(sock,server_socket_callback,false);
runloop_run();
printf("Shutting down because runloop stopped\n");
firebase_stop();
db_close();
}
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