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#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <dlfcn.h>
#include <errno.h>
#include "http.h"
#include "memory.h"
#include "plugin.h"
#include "util.h"
#define PORT 8080
int num_threads=0;
static void signal_handler(int sig){
if(sig==SIGCHLD){
int saved_errno=errno;
while(true){
int status;
pid_t pid=waitpid(-1,&status,WNOHANG);
if(pid<=0){
break;
}
if(WIFEXITED(status)){
num_threads--;
}
}
errno=saved_errno;
}
}
typedef struct Plugin{
char *name;
Handler handler;
struct Plugin *next;
} Plugin;
Plugin *pluginlist=NULL,*pluginlist_last=NULL;
static void plugin_register_callback(const char *name,Handler handler){
if(pluginlist==NULL){
pluginlist=pluginlist_last=malloc(1,Plugin);
pluginlist->name=copy_str(name);
pluginlist->handler=handler;
pluginlist->next=NULL;
} else {
Plugin *newplugin=malloc(1,Plugin);
newplugin->name=copy_str(name);
newplugin->handler=handler;
newplugin->next=NULL;
pluginlist_last->next=newplugin;
pluginlist_last=newplugin;
}
printf("Registered plugin '%s' (handler %p)\n",name,handler);
}
typedef void (*register_function)(register_callback_t callback);
static void load_plugin(const char *name){
void *lib=dlopen(name,RTLD_NOW|RTLD_LOCAL);
if(lib==NULL){
fprintf(stderr,"dlopen(%s): %s\n",name,dlerror());
exit(1);
}
register_function regfunc=(register_function)dlsym(lib,"plugin_register_yourself");
if(regfunc==NULL){
fprintf(stderr,"Cannot find plugin_register_yourself symbol in library '%s'\n",name);
exit(1);
}
regfunc(&plugin_register_callback);
}
static void connection_handler(int sock){
Headers *headers=http_get_headers(sock);
if(headers==NULL){
return;
}
for(Plugin *pl=pluginlist;pl!=NULL;pl=pl->next){
switch(pl->handler(sock,headers)){
case HR_HANDLED:
printf("Request handled by %s\n",pl->name);
break;
case HR_NEXT:
continue;
case HR_ERROR:
printf("Request handler '%s' threw error\n",pl->name);
break;
}
break;
}
}
int main(int argc,char **argv){
if(argc==1){
printf("Loading no plugin files\n");
} else {
for(int i=1;i<argc;i++){
load_plugin(argv[i]);
}
}
int sock=socket(PF_INET,SOCK_STREAM,0);
if(sock<0){
perror("socket");
return 1;
}
int one=1;
if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&one,sizeof(int))<0){
perror("setsockopt");
return 1;
}
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_addr.s_addr=htonl(INADDR_ANY);
sin.sin_port=htons(PORT);
if(bind(sock,(struct sockaddr*)&sin,sizeof(sin))<0){
close(sock);
perror("bind");
return 1;
}
if(listen(sock,8)<0){
perror("listen");
return 1;
}
signal(SIGCHLD,signal_handler);
printf("Listening on port %d\n",PORT);
while(true){
struct sockaddr_storage client_addr;
socklen_t client_addr_sz=sizeof(client_addr);
int clientsock=accept(sock,(struct sockaddr*)&client_addr,&client_addr_sz);
if(clientsock<0){
perror("accept");
continue;
}
char str[INET_ADDRSTRLEN];
inet_ntop(client_addr.ss_family,&((struct sockaddr_in*)&client_addr)->sin_addr,
str,sizeof(str));
pid_t pid=fork();
if(pid==0){
close(sock);
connection_handler(clientsock);
close(clientsock);
exit(0);
}
if(pid<0){
perror("fork");
return 1;
}
num_threads++;
printf("Accept from %s; child pid %d, %d thread%s\n",str,pid,num_threads,
num_threads==1?"":"s");
close(clientsock);
}
}
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