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#define _GNU_SOURCE
#include <stdio.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include "http.h"
#include "memory.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;
}
}
// Returns -1 on error, 0 on success
static int sendall(int sock,const char *buf,ssize_t len){
if(len==-1){
len=strlen(buf);
}
ssize_t sent=0;
while(sent<len){
ssize_t ret=send(sock,buf+sent,len-sent,0);
if(ret<0){
if(errno==EINTR){
continue;
} else {
return -1;
}
}
sent+=ret;
}
return 0;
}
__attribute__((format (printf, 2, 3)))
static int sendallf(int sock,const char *format,...){
va_list ap;
va_start(ap,format);
char *buf;
int len=vasprintf(&buf,format,ap);
va_end(ap);
if(len<0){
return -1;
}
int ret=sendall(sock,buf,len);
free(buf);
return ret;
}
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);
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]);
}
}
int main(void){
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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