DistRen Changeset - 974e60d6a71b · protofusion repositories

Changeset - 974e60d6a71b

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Nathan Brink (binki) - 15 years ago 2010-03-25 11:08:38
ohnobinki@ohnopublishing.net

Server-side sockets partial implementation

3 files changed with 321 insertions and 30 deletions:

src/server/distrend.c

src/server/listen.c

300

src/server/listen.h

0 comments (0 inline, 0 general)

src/server/distrend.c

➞

Show inline comments

@@ @@ -511,7 +511,16 @@ int interactiveTest(int test, struct gen @@
      case 5:
        distrend_listen(geninfo->config, &clients);
        while(1)
+	 {
 	 distrend_accept(geninfo->config, clients);
 	   /*
 	     code for reading data from clients either goes here or in distrend_accept().
 	     it might make sense for us to just pass the distrend_accept() function a
 	     callback which can handle packets or to have a generic packet handling
 	     subsystem which gathers data into groups defined by by packet.h and then
 	     passed onto the callback.
 	   */
+	 }
        break;
      case 0:

src/server/listen.c

➞

Show inline comments

@@ @@ -19,6 +19,8 @@ @@
 #include "listen.h"
 #include <errno.h>
 #include <fcntl.h>
 #include <list.h>
 #include <malloc.h>
 #include <netinet/in.h>
@@ @@ -27,6 +29,7 @@ @@
 #include <sys/types.h>
 #include <sys/select.h>
 #include <sys/socket.h>
 #include <unistd.h>
 /* local */
@@ @@ -34,16 +37,19 @@ struct distrend_clientset @@
+{
   LIST *clients;
   /*
     for select()
    */
   fd_set readfds;
   fd_set writefds;
   int nfds;
 };
 struct distrend_packet
+{
   size_t len;
   char *data;
 };
 int distrend_client_new(struct distrend_client **client, int sock, enum distrend_client_state state);
 int distrend_client_free(struct distrend_client *client);
 void distrend_packet_free(struct distrend_packet *packet);
 int distrend_makesocknonblock(int sock);
 int distrend_listen(struct distrend_config *config, struct distrend_clientset **clients)
+{
@@ @@ -61,8 +67,9 @@ int distrend_listen(struct distrend_conf @@
   *clients = malloc(sizeof(struct distrend_clientset));
   (*clients)->clients = list_init();
   (*clients)->nfds = 1;
-  sockaddr.sin6_port = htonl(4050);
+  sockaddr.sin6_port = htons(4050);
   config->listens->sock = socket(AF_INET6, SOCK_STREAM, 0);
   tmp = bind(config->listens->sock, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
@@ @@ -75,12 +82,20 @@ int distrend_listen(struct distrend_conf @@
+    }
   tmp = listen(config->listens->sock, 1);
   if(tmp == -1)
+    {
       perror("listen");
       free(*clients);
   FD_ZERO(&(*clients)->readfds);
   FD_ZERO(&(*clients)->writefds);
       return 1;
+    }
   /** accept()able sockets are considered ``readable'' */
   FD_SET(config->listens->sock, &(*clients)->readfds);
   tmp = distrend_makesocknonblock(config->listens->sock);
   if(tmp)
+    {
       free(*clients);
       return 1;
+    }
   return 0;
+}
@@ @@ -88,27 +103,152 @@ int distrend_listen(struct distrend_conf @@
 int distrend_handleread(struct distrend_config *config,
 		    struct distrend_client *client)
+{
   fprintf(stderr, "%s:%d: STUB: I'm supposed to read data from the client\n",
 	  __FILE__, __LINE__);
   struct distrend_packet *packet;
   ssize_t readlen;
   char buf[8192];
   packet = malloc(sizeof(struct distrend_packet));
   if(!packet)
+    {
       fprintf(stderr, "OOM\n");
       return 1;
+    }
   packet->len = 0;
   packet->data = NULL;
   readlen = read(client->sock, buf, sizeof(buf));
   if(readlen == -1)
+    {
       perror("read");
       switch(errno)
+	{
 	case EINTR:
 	case EAGAIN:
 	  break;
 	default:
 	  client->state = DISTREND_CLIENT_DEAD;
 	  free(packet);
 	  return 1;
+	}
+    }
   if(readlen == 0)
     /* handle EOF */
+    {
       client->state = DISTREND_CLIENT_DEAD;
       free(packet);
       return 1;
+    }
   packet->len = readlen;
   packet->data = malloc(readlen);
   if(!packet->data)
+    {
       fprintf(stderr, "OOM!\n");
       free(packet);
       return 1;
+    }
   memcpy(packet->data, buf, readlen);
   return 0;
+}
 struct distrend_accept_fdset_prepare_data
+{
   fd_set readfds;
   fd_set writefds;
   /**
      stores the highest FD number which is one less than the first
    arfgument to select(). So do select(maxfd + 1, ...)
   */
   int maxfd;
 };
 int distrend_accept_fdset_prepare(struct distrend_accept_fdset_prepare_data *data,
 				  struct distrend_client *client)
+{
   if(client->state == DISTREND_CLIENT_DEAD)
     return TRUE;
   if(client->sock > data->maxfd)
     data->maxfd = client->sock;
   FD_SET(client->sock, &data->readfds);
   /**
      Only select on an outgoing socket if we have something to
      say.
    */
   if(!q_empty(client->outmsgs))
     FD_SET(client->sock, &data->writefds);
   return TRUE;
+}
 struct distrend_accept_client_proc_data
+{
   fd_set *fdset;
   struct distrend_config *config;
   enum {DISTREND_ACCEPT_CLIENT_READ, DISTREND_ACCEPT_CLIENT_WRITE} mode;
 };
 int distrend_accept_client_proc(struct distrend_accept_client_proc_data *data,
 				struct distrend_client *client)
+{
   struct distrend_packet *packet;
   ssize_t written_amount;
   if(client->state == DISTREND_CLIENT_DEAD)
     return TRUE;
   if(!FD_ISSET(client->sock, data->fdset))
     /** continue iteration through the list */
     return TRUE;
   fprintf(stderr, "%s:%d: My traversal says that sock %d has data waiting\n",
 	  __FILE__, __LINE__, client->sock);
   fprintf(stderr, "%s:%d: My traversal says that sock %d is available for %sing\n",
 	  __FILE__, __LINE__, client->sock,
 	  (data->mode == DISTREND_ACCEPT_CLIENT_READ) ? "read" : "write");
   switch(data->mode)
+    {
     case DISTREND_ACCEPT_CLIENT_WRITE:
       if(q_empty(client->outmsgs))
 	return TRUE;
       packet = q_front(client->outmsgs);
       written_amount = write(client->sock, packet->data, packet->len);
       /**
 	 Disconnect in case of write error.
        */
       if(written_amount == -1)
+	{
 	  perror("write");
 	  /*
 	    distrend_client_free();
 	    Until liblist has the ability to delete nodes
 	    during traversal, we'll have to free the client
 	    during a client-list cleanup/pruning cycle.
 	  */
 	  client->state = DISTREND_CLIENT_DEAD;
+	}
       if(packet->len == written_amount)
+	{
 	  q_dequeue(client->outmsgs);
 	  distrend_packet_free(packet);
+	}
       else
+	{
 	  /**
 	     shifting seems the simplest solution.
 	   */
 	  packet->len -= written_amount;
+	}
       break;
     case DISTREND_ACCEPT_CLIENT_READ:
   distrend_handleread(data->config, client);
       break;
+    }
   /** continue iteration through the list */
   return TRUE;
@@ @@ -117,13 +257,21 @@ int distrend_accept_client_proc(struct d @@
 int distrend_accept(struct distrend_config *config, struct distrend_clientset *clients)
+{
   int tmp;
   fd_set readfds;
   fd_set writefds;
   int newclientsock;
   struct distrend_accept_fdset_prepare_data fdsets;
   struct distrend_accept_client_proc_data travinfo;
   struct distrend_client *newclient;
   memcpy(&readfds, &clients->readfds, sizeof(fd_set));
   memcpy(&writefds, &clients->writefds, sizeof(fd_set));
   FD_ZERO(&fdsets.readfds);
   FD_ZERO(&fdsets.writefds);
   FD_SET(config->listens->sock, &fdsets.readfds);
   fdsets.maxfd = config->listens->sock;
   tmp = select(clients->nfds, &readfds, &writefds, NULL, (struct timeval *)NULL);
   list_traverse(clients->clients, &fdsets, (list_traverse_func_t)&distrend_accept_fdset_prepare, LIST_FRNT | LIST_ALTR);
   fprintf(stderr, "select()...");
   tmp = select(fdsets.maxfd + 1, &fdsets.readfds, &fdsets.writefds, NULL, (struct timeval *)NULL);
   if(tmp == -1)
+    {
       perror("select");
@@ @@ -132,10 +280,57 @@ int distrend_accept(struct distrend_conf @@
+    }
   /**
      deal with all sockets that have data waiting
      Deal first with data waiting to be sent and then
      with input data.
    */
   travinfo.config = config;
   travinfo.fdset = &fdsets.writefds;
   travinfo.mode = DISTREND_ACCEPT_CLIENT_WRITE;
   list_traverse(clients->clients, &travinfo, (list_traverse_func_t)&distrend_accept_client_proc, LIST_FRNT | LIST_ALTR);
   travinfo.fdset = &fdsets.readfds;
   travinfo.mode = DISTREND_ACCEPT_CLIENT_READ;
   list_traverse(clients->clients, &travinfo, (list_traverse_func_t)&distrend_accept_client_proc, LIST_FRNT | LIST_ALTR);
   /**
      Handle new connections.
    */
   list_traverse(clients->clients, &readfds, (list_traverse_func_t)&distrend_accept_client_proc, LIST_FRNT | LIST_ALTR);
   if(FD_ISSET(config->listens->sock, &fdsets.readfds))
+    {
       newclientsock = accept(config->listens->sock, (struct sockaddr *)NULL, (socklen_t *)NULL);
       if(distrend_client_new(&newclient, newclientsock, DISTREND_CLIENT_PREAUTH))
+	{
 	  fprintf(stderr, "error allocating client struct\n");
 	  return 1;
+	}
       clients->nfds ++;
       list_insert_after(clients->clients, newclient, 0);
       fprintf(stderr, "accepted new connection\n");
       distrend_client_write(newclient, "hello\n", 6);
+    }
   /**
      Until liblist supports deleting nodes during a traversal,
      we clean dead clients here:
    */
   list_mvfront(clients->clients);
   newclient = list_curr(clients->clients);
   while(newclient)
+    {
       if(newclient->state == DISTREND_CLIENT_DEAD)
+	{
 	  distrend_client_free(newclient);
 	  list_remove_curr(clients->clients);
 	  fprintf(stderr, "removed dead connection\n");
+	}
       list_mvnext(clients->clients);
       /* provide for termination of this loop */
       if(newclient == list_curr(clients->clients))
 	newclient = NULL;
       else
 	newclient = list_curr(clients->clients);
+    }
   return 0;
+}
@@ @@ -156,6 +351,15 @@ void remotio_send_to_client(struct distr @@
 int distrend_client_new(struct distrend_client **client, int sock, enum distrend_client_state state)
+{
   int tmp;
   tmp = distrend_makesocknonblock(sock);
   if(tmp)
+    {
       fprintf(stderr, "Not accepting this connection because I cannot make the sock non-blocking\n");
       return 1;
+    }
   *client = malloc(sizeof(struct distrend_client));
   if(!*client)
+    {
@@ @@ -164,17 +368,87 @@ int distrend_client_new(struct distrend_ @@
+    }
   (*client)->sock = sock;
   (*client)->state = state;
   (*client)->inmsgs = list_init();
   (*client)->outmsgs = list_init();
   (*client)->inmsgs = q_init();
   (*client)->outmsgs = q_init();
   return 0;
+}
 int distrend_client_free(struct distrend_client *client)
+{
   list_free(client->inmsgs, (void *)LIST_DEALLOC);
   list_free(client->outmsgs, (void *)LIST_DEALLOC);
   q_free(client->inmsgs, (list_dealloc_func_t)distrend_packet_free);
   q_free(client->outmsgs, (list_dealloc_func_t)distrend_packet_free);
   close(client->sock);
   return 0;
+}
   fprintf(stderr, "%s:%d: stub!", __FILE__, __LINE__);
 void distrend_packet_free(struct distrend_packet *packet)
+{
   free(packet->data);
   free(packet);
+}
 int distrend_makesocknonblock(int sock)
+{
   int fdstatus;
   int tmp;
   fdstatus = fcntl(sock, F_GETFL);
   fdstatus |= O_NONBLOCK;
   tmp = fcntl(sock, F_SETFL, fdstatus);
   if(tmp == -1)
+    {
       perror("fcntl");
   return 1;
+}
   return 0;
+}
 int distrend_client_write(struct distrend_client *client, char *towrite, size_t msglen)
+{
   struct distrend_packet *packet;
   packet = malloc(sizeof(struct distrend_packet));
   if(!packet)
+    {
       fprintf(stderr, "OOM\n");
       return 1;
+    }
   packet->len = msglen;
   packet->data = malloc(msglen);
   if(!packet->data)
+    {
       free(packet);
       fprintf(stderr, "OOM\n");
       return 1;
+    }
   memcpy(packet->data, towrite, msglen);
   q_enqueue(client->outmsgs, packet, 0);
   return 0;
+}
 int distrend_client_read(struct distrend_client *client, char **toread, size_t *lenread)
+{
   struct distrend_packet *packet;
   *lenread = 0;
   *toread = NULL;
   if(q_empty(client->inmsgs))
     return 1;
   packet = q_dequeue(client->inmsgs);
   *lenread = packet->len;
   *toread = packet->data;
   free(packet);
   return 0;
+}

src/server/listen.h

➞

Show inline comments

@@ @@ -26,13 +26,14 @@ struct distrend_client; @@
 #include "distrend.h"
-#include <list.h>
+#include <queue.h>
 enum distrend_client_state
+  {
     DISTREND_CLIENT_PREAUTH,
     DISTREND_CLIENT_GOODDOGGY,
     DISTREND_CLIENT_BADBOY
     DISTREND_CLIENT_BADBOY,
     DISTREND_CLIENT_DEAD
   };
 struct distrend_listen
@@ @@ -45,8 +46,8 @@ struct distrend_client @@
+{
   int sock;
   enum distrend_client_state state;
   LIST *inmsgs;
   LIST *outmsgs;
   QUEUE *inmsgs;
   QUEUE *outmsgs;
 };
@@ @@ -73,6 +74,13 @@ int distrend_accept(struct distrend_conf @@
 int distrend_unlisten(struct distrend_listen *listens, struct distrend_clientset *clients);
 /**
    writes message to client.
    @param towrite the caller is expected to free this string. This function will
    strdup() it, in essence.
  */
 int distrend_client_write(struct distrend_client *client, char *towrite, size_t msglen);
 /**
    This is probably just NOT a placeholder for remotio
 */
 void remotio_send_to_client();

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