src/network.c

   1 /* network.c -- network management stuff
   2  *
   3  * author: hackbard@hackdaworld.dyndns.org
   4  *
   5  */
   6
   7 #include "network.h"
   8
   9 int network_init(t_net *net) {
  10
  11   struct sockaddr_in addr;
  12   int true;
  13
  14   puts("[network] initializing network ...");
  15
  16   memset(net->connection,0,MAX_CONNECTIONS*sizeof(t_connection));
  17   net->c_count=0;
  18   net->sendmask=0;
  19
  20   if((net->l_fd=socket(AF_INET,SOCK_STREAM,0))==-1) {
  21     perror("[network] socket call");
  22     return N_ERROR;
  23   }
  24
  25   memset(&addr,0,sizeof(struct sockaddr));
  26   addr.sin_family=AF_INET;
  27   addr.sin_port=htons(net->l_port);
  28   addr.sin_addr.s_addr=INADDR_ANY;
  29
  30   /* prevent addres in use error message */
  31   true=1;
  32   if(setsockopt(net->l_fd,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(true))==-1) {
  33     perror("[network] setsockopt call");
  34     return N_ERROR;
  35   }
  36
  37   if(bind(net->l_fd,(struct sockaddr *)&addr,
  38           sizeof(struct sockaddr))==-1) {
  39     perror("[network] bind call");
  40     return N_ERROR;
  41   }
  42
  43   if(listen(net->l_fd,MAX_LISTEN_QUEUE)==-1) {
  44     perror("[network] listen call");
  45     return N_ERROR;
  46   }
  47
  48   printf("[network] listen on %s port %d\n",inet_ntoa(addr.sin_addr),
  49                                           net->l_port);
  50
  51   return N_SUCCESS;
  52 }
  53
  54 int network_shutdown(t_net *net) {
  55
  56   int channel;
  57
  58   for(channel=0;channel<MAX_CONNECTIONS;channel++)
  59     if(net->connection[channel].status&C_SOCKET)
  60       close(net->connection[channel].fd);
  61
  62   if(close(net->l_fd)==-1) {
  63     perror("[network] close call");
  64     return N_ERROR;
  65   }
  66
  67   puts("[network] shutdown");
  68
  69   return N_SUCCESS;
  70 }
  71
  72 int network_set_listen_port(t_net *net,in_port_t port) {
  73
  74   net->l_port=port;
  75
  76   return N_SUCCESS;
  77 }
  78
  79 int network_manage_connection(t_net *net) {
  80
  81   int i;
  82   struct sockaddr_in addr;
  83
  84   for(i=0;i<MAX_CONNECTIONS;i++) {
  85
  86     if(net->connection[i].status&C_IN_USE) {
  87
  88       if(net->connection[i].status&C_HANGUP) {
  89         if(close(net->connection[i].fd)==-1) {
  90           perror("[network] close call");
  91           return N_ERROR;
  92         }
  93         printf("[network] connection %d closed\n",i);
  94         net->connection[i].status=0;
  95       }
  96
  97       if(net->connection[i].status&C_INFO_A) {
  98
  99         if(!net->connection[i].status&C_SOCKET) {
 100           if((net->connection[i].fd=socket(AF_INET,SOCK_STREAM,0))==-1) {
 101             perror("[network] socket call");
 102             return N_ERROR;
 103           }
 104         }
 105
 106         if(!net->connection[i].status&C_ESTABL) {
 107
 108           memset(&addr,0,sizeof(struct sockaddr));
 109           addr.sin_family=AF_INET;
 110           addr.sin_port=htons(net->connection[i].port);
 111           if(!inet_aton(net->connection[i].ip,&(addr.sin_addr))) {
 112             perror("[network] inet_aton call");
 113             return N_ERROR;
 114           }
 115
 116           if(connect(net->connection[i].fd,(struct sockaddr *)&addr,
 117                      sizeof(struct sockaddr))==-1) {
 118             perror("[network] connect call");
 119             return N_ERROR;
 120           }
 121
 122           printf("[network] established connection to %s port %d on channel %d\n",
 123                  net->connection[i].ip,net->connection[i].port,i);
 124
 125         }
 126
 127       }
 128
 129     }
 130
 131   }
 132
 133   return N_SUCCESS;
 134 }
 135
 136 int network_manage_incoming(t_net *net) {
 137
 138   int channel;
 139   struct sockaddr_in addr;
 140   int len;
 141
 142   for(channel=0;channel<MAX_CONNECTIONS;channel++) {
 143     if(!net->connection[channel].status&C_IN_USE) {
 144       if((net->connection[channel].fd=accept(net->l_fd,
 145                                        (struct sockaddr *)&addr,
 146                                        &len))==-1) {
 147         perror("[network] accept call");
 148         return N_ERROR;
 149       }
 150       strncpy(net->connection[channel].ip,inet_ntoa(addr.sin_addr),IP_DIGITS);
 151       net->connection[channel].port=ntohs(addr.sin_port);
 152       net->connection[channel].status=C_IN_USE|C_INFO_A|C_SOCKET|C_ESTABL;
 153       printf("[network] established connection from %s port %d on channel %d\n",
 154              net->connection[channel].ip,net->connection[channel].port,channel);
 155       return channel;
 156     }
 157   }
 158
 159   puts("[network] maximum connections reached");
 160   return N_ERROR;
 161 }
 162
 163 int network_send(int fd,unsigned char *data,int datasize) {
 164
 165   int count,left;
 166
 167   count=0;
 168   left=datasize;
 169
 170   while(left) {
 171     if((count=write(fd,data+datasize-left,left))==-1) {
 172       perror("[network] write call");
 173       return N_ERROR;
 174     }
 175     left-=count;
 176   }
 177
 178   return N_SUCCESS;
 179 }
 180
 181 int network_receive(int fd,unsigned char *data,int datasize) {
 182
 183   int count;
 184
 185   if((count=read(fd,data,datasize))==-1) {
 186     perror("[network] read call");
 187     return N_ERROR;
 188   }
 189
 190   return count;
 191 }