From 79bd2194539aa559078de9afb1500a2e754ee501 Mon Sep 17 00:00:00 2001
From: Franklin Wei <frankhwei536@gmail.com>
Date: Sun, 13 Jul 2014 19:54:47 -0400
Subject: Added server

---
 server.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 server.c

(limited to 'server.c')

diff --git a/server.c b/server.c
new file mode 100644
index 0000000..fe8b6f8
--- /dev/null
+++ b/server.c
@@ -0,0 +1,131 @@
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include "joshua.h"
+#define PORT 1029
+int server_socket;
+int pipes[FD_SETSIZE][2];
+int make_server_socket(uint16_t port)
+{
+  int sock;
+  struct sockaddr_in name;
+  sock=socket(AF_INET, SOCK_STREAM, 0);
+  if(sock<0)
+    {
+      printf("error creating socket.\n");
+      return -1;
+    }
+  name.sin_family=AF_INET;
+  name.sin_port=htons(port);
+  name.sin_addr.s_addr=htonl(INADDR_ANY);
+  int ret=bind(sock, (struct sockaddr*) &name, sizeof(name));
+  if(ret<0)
+    {
+      printf("error binding to port %d\n", port);
+      return -1;
+    }
+  return sock;
+}
+int process_data(int fd)
+{
+  char buf[1024];
+  memset(buf, 0, sizeof(buf));
+  int ret=read(fd, buf, sizeof(buf));
+  if(ret<0) /* error */
+    {
+      printf("error in read()\n");
+      return -1;
+    }
+  if(ret==0)
+    {
+      printf("EOF from client\n");
+      return -1;
+    }
+  else
+    {
+      write(pipes[fd][1], buf, strlen(buf));
+    }
+}
+void serv_cleanup()
+{
+  printf("preparing to exit...\n");
+  fflush(stdout);
+  close(server_socket);
+}
+int main(int argc, char* argv[])
+{
+  printf("starting server...\n");
+  signal(SIGINT, &serv_cleanup);
+  int sock=make_server_socket(PORT);
+  server_socket=sock;
+  fd_set active_fd_set, read_fd_set;
+  struct sockaddr_in client;
+  if(listen(sock, 1)<0)
+    {
+      printf("error listening.\n");
+      return 1;
+    }
+  FD_ZERO(&active_fd_set);
+  FD_SET(sock, &active_fd_set);
+  printf("listening on port %d\n", PORT);
+  while(1)
+    {
+      read_fd_set=active_fd_set;
+      int ret=select(FD_SETSIZE, &read_fd_set, 0,0,0);
+      if(ret<0)
+        {
+          printf("select() returned error.\n");
+          return 1;
+        }
+      for(int i=0;i<FD_SETSIZE;++i)
+        {
+          if(FD_ISSET(i, &read_fd_set))
+            {
+              if(i==sock)
+                {
+                  /* new connection */
+                  int new, size;
+                  size=sizeof(client);
+                  new=accept(sock, (struct sockaddr*) &client, &size);
+                  if(new<0)
+                    {
+                      printf("error accepting connection.\n");
+                      return 1;
+                    }
+                  printf("new connection.\n");
+                  FD_SET(new, &active_fd_set);
+                  int ret=pipe(pipes[i]);
+                  if(ret<0)
+                    {
+                      printf("pipe error.\n");
+                    }
+                  pid_t pid=fork();
+                  if(pid==0) /* child */
+                    {
+                      printf("child.\n");
+                      be_joshua(new);
+                      close(new);
+                      FD_CLR(new, &active_fd_set);
+                      exit(0);
+                    }
+                }
+              else
+                {
+                  /* data from existing connection */
+                  if(process_data(i)<0)
+                    {
+                      close(i);
+                      FD_CLR(i, &active_fd_set);
+                    }
+                }
+            }
+        }
+    }
+}
-- 
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