From ed2b3a38ec05c566c645dc2aabfd513edff8d63b Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sun, 25 Dec 2016 22:55:21 +0100
Subject: Plugins

---
 main.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 66 insertions(+), 10 deletions(-)

(limited to 'main.c')

diff --git a/main.c b/main.c
index 60b9584..52d10bd 100644
--- a/main.c
+++ b/main.c
@@ -7,9 +7,11 @@
 #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"
 
 
@@ -37,27 +39,81 @@ static void signal_handler(int sig){
 }
 
 
+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;
 	}
 
-	sendall(sock,"HTTP/1.1 200 OK\r\n"
-	             "Content-Type: text/plain; charset=UTF-8\r\n"
-	             "Server: cserver\r\n"
-	             "\r\n",-1);
+	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;
 
-	sendallf(sock,"Method: %s\n",headers->method);
-	sendallf(sock,"URL: %s\n",headers->url);
-	sendallf(sock,"Version: %s\n",headers->version);
-	for(int i=0;i<headers->nheaders;i++){
-		sendallf(sock,"Header '%s': '%s'\n",headers->headers[i][0],headers->headers[i][1]);
+			case HR_ERROR:
+				printf("Request handler '%s' threw error\n",pl->name);
+				break;
+		}
+		break;
 	}
 }
 
 
-int main(void){
+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");
-- 
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