X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fivac.git;a=blobdiff_plain;f=src%2Fnetwork.c;fp=src%2Fnetwork.c;h=c7425efb5f55c0c89894fdbf179f2a89d676347c;hp=0000000000000000000000000000000000000000;hb=c8c162c2b1f82f32160bcaa4159ea8735a8582c5;hpb=4546108a81317af1135683e85b9340715e585339

diff --git a/src/network.c b/src/network.c
new file mode 100644
index 0000000..c7425ef
--- /dev/null
+++ b/src/network.c
@@ -0,0 +1,253 @@
+/* network.c -- network management stuff
+ *
+ * author: hackbard@hackdaworld.dyndns.org
+ *
+ */
+
+#include "network.h"
+
+int network_init(t_net *net) {
+  
+  struct sockaddr_in addr;
+  int true;
+ 
+  puts("[network] initializing network ...");
+
+  memset(net->connection,0,MAX_CONNECTIONS*sizeof(t_connection));
+  net->c_count=0;
+  net->sendmask=0;
+
+  if((net->l_fd=socket(AF_INET,SOCK_STREAM,0))==-1) {
+    perror("[network] socket call");
+    return N_ERROR;
+  }
+
+  memset(&addr,0,sizeof(struct sockaddr));
+  addr.sin_family=AF_INET;
+  addr.sin_port=htons(net->l_port);
+  addr.sin_addr.s_addr=INADDR_ANY;
+
+  /* prevent addres in use error message */
+  true=1;
+  if(setsockopt(net->l_fd,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(true))==-1) {
+    perror("[network] setsockopt call");
+    return N_ERROR;
+  }
+
+  if(bind(net->l_fd,(struct sockaddr *)&addr,
+          sizeof(struct sockaddr))==-1) {
+    perror("[network] bind call");
+    return N_ERROR;
+  }
+
+  if(listen(net->l_fd,MAX_LISTEN_QUEUE)==-1) {
+    perror("[network] listen call");
+    return N_ERROR;
+  }
+
+  printf("[network] listen on %s port %d\n",inet_ntoa(addr.sin_addr),
+                                          net->l_port);
+
+  return N_SUCCESS;
+}
+
+int network_shutdown(t_net *net) {
+
+  if(close(net->l_fd)==-1) {
+    perror("[network] close call");
+    return N_ERROR;
+  }
+
+  puts("[network] shutdown");
+
+  return N_SUCCESS;
+}
+
+int network_set_listen_port(t_net *net,in_port_t port) {
+
+  net->l_port=port;
+
+  return N_SUCCESS;
+}
+
+int network_manage_connection(t_net *net) {
+
+  int i;
+  struct sockaddr_in addr;
+  
+  for(i=0;i<MAX_CONNECTIONS;i++) {
+
+    if(net->connection[i].status&C_IN_USE) {
+
+      if(net->connection[i].status&C_HANGUP) {
+        if(close(net->connection[i].fd)==-1) {
+          perror("[network] close call");
+          return N_ERROR;
+        }
+        printf("[network] connection %d closed\n",i);
+        net->connection[i].status=0;
+      }
+
+      if(net->connection[i].status&C_INFO_A) {
+
+        if(!net->connection[i].status&C_SOCKET) {
+          if((net->connection[i].fd=socket(AF_INET,SOCK_STREAM,0))==-1) {
+            perror("[network] socket call");
+            return N_ERROR;
+          }
+        }
+
+        if(!net->connection[i].status&C_ESTABL) {
+
+          memset(&addr,0,sizeof(struct sockaddr));
+          addr.sin_family=AF_INET;
+          addr.sin_port=htons(net->connection[i].port);
+          if(!inet_aton(net->connection[i].ip,&(addr.sin_addr))) {
+            perror("[network] inet_aton call");
+            return N_ERROR;
+          }
+          
+          if(connect(net->connection[i].fd,(struct sockaddr *)&addr,
+                     sizeof(struct sockaddr))==-1) {
+            perror("[network] connect call");
+            return N_ERROR;
+          }
+
+          printf("[network] established connection to %s port %d on channel %d\n",
+                 net->connection[i].ip,net->connection[i].port,i);
+
+        }
+
+      }
+
+    }
+
+  }
+
+  return N_SUCCESS;
+}
+
+int network_manage_incoming(t_net *net) {
+
+  int channel;
+  struct sockaddr_in addr;
+  int len;
+
+  for(channel=0;channel<MAX_CONNECTIONS;channel++) {
+    if(!net->connection[channel].status&C_IN_USE) {
+      if((net->connection[channel].fd=accept(net->l_fd,
+                                       (struct sockaddr *)&addr,
+                                       &len))==-1) {
+        perror("[network] accept call");
+        return N_ERROR;
+      }
+      strncpy(net->connection[channel].ip,inet_ntoa(addr.sin_addr),IP_DIGITS);
+      net->connection[channel].port=ntohs(addr.sin_port);
+      net->connection[channel].status=C_IN_USE|C_INFO_A|C_SOCKET|C_ESTABL;
+      printf("[network] established connection from %s port %d on channel %d\n",
+             net->connection[channel].ip,net->connection[channel].port,channel);
+      return channel;
+    }
+  }
+
+  puts("[network] maximum connections reached");
+  return N_ERROR;
+}
+ 
+int network_send(int fd,unsigned char *data,int datasize) {
+
+  int count,left;
+
+  count=0;
+  left=datasize;
+
+  while(left) {
+    if((count=write(fd,data+datasize-left,left))==-1) {
+      perror("[network] write call");
+      return N_ERROR;
+    }
+    left-=count;
+  }
+
+  return N_SUCCESS;
+}
+
+int network_receive(int fd,unsigned char *data,int datasize) {
+
+  int count;
+
+  if((count=read(fd,data,datasize))==-1) {
+    perror("[network] read call");
+    return N_ERROR;
+  }
+
+  return count;
+}
+
+int send_info(int channel,t_net *net,char *name) {
+
+  char data[SEND_N_MAX];
+  int size;
+
+  size=strlen(name);
+
+  data[0]=SEND_N_NAME;
+  data[1]=size;
+  strncpy(data+2,name,size);
+  size+=2;
+
+  data[size]=SEND_N_G_CAP;
+  data[size+1]=sizeof(unsigned char);
+  data[size+1+sizeof(unsigned char)]=net->cap;
+  size+=(sizeof(unsigned char)+2);
+
+  data[size]=SEND_N_AV_CAP;
+  data[size+1]=sizeof(unsigned short);
+  data[size+1+sizeof(unsigned short)]=net->avcap;
+  size+=(sizeof(unsigned short)+2);
+
+  if(network_send(net->connection[channel].fd,data,size)==N_ERROR) {
+    puts("[network] send_info failed");
+    return N_ERROR;
+  }
+
+  return N_SUCCESS;
+}
+
+int receive_info(int channel,t_net *net) {
+
+  char data[CHAR_N_UNAME+2];
+  int count,length;
+
+  count=0;
+
+  if((length=network_receive(net->connection[channel].fd,
+                             data,SEND_N_MAX))==N_ERROR) {
+    puts("[network] receive_info failed");
+    return N_ERROR;
+  }
+
+  while(length-count) {
+    switch(data[count]) {
+      case SEND_N_NAME:
+        strncpy(net->connection[channel].name,&data[count+2],data[count+1]);
+        net->connection[channel].name[(int)data[count+2]]='\0';
+        count+=(data[count+2]+2);
+        break;
+      case SEND_N_G_CAP:
+        net->connection[channel].cap=data[count+4];
+        count+=(sizeof(unsigned char)+2);
+        break;
+      case SEND_N_AV_CAP:
+        net->connection[channel].avcap=data[count+3]<<8;
+        net->connection[channel].avcap|=data[count+4];
+        count+=(sizeof(unsigned short)+2);
+        break;
+      default:
+        puts("[network] receive_info, unknown character");
+        return N_ERROR;
+    }
+  }
+    
+  return N_SUCCESS;
+}