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           net->connection[i].status|=C_SOCKET;
 105         }
 106
 107         if((!net->connection[i].status&C_ESTABL)&&
 108            (net->connection[i].status&C_SOCKET)) {
 109
 110           memset(&addr,0,sizeof(struct sockaddr));
 111           addr.sin_family=AF_INET;
 112           addr.sin_port=htons(net->connection[i].port);
 113           if(!inet_aton(net->connection[i].ip,&(addr.sin_addr))) {
 114             perror("[network] inet_aton call");
 115             return N_ERROR;
 116           }
 117
 118           if(connect(net->connection[i].fd,(struct sockaddr *)&addr,
 119                      sizeof(struct sockaddr))==-1) {
 120             perror("[network] connect call");
 121             return N_ERROR;
 122           }
 123
 124           printf("[network] established connection to %s port %d on channel %d\n",
 125                  net->connection[i].ip,net->connection[i].port,i);
 126           net->connection[i].status|=C_ESTABL;
 127
 128         }
 129
 130       }
 131
 132     }
 133
 134   }
 135
 136   return N_SUCCESS;
 137 }
 138
 139 int network_manage_incoming(t_net *net) {
 140
 141   int channel;
 142   struct sockaddr_in addr;
 143   int len;
 144
 145   for(channel=0;channel<MAX_CONNECTIONS;channel++) {
 146     if(!net->connection[channel].status&C_IN_USE) {
 147       if((net->connection[channel].fd=accept(net->l_fd,
 148                                        (struct sockaddr *)&addr,
 149                                        &len))==-1) {
 150         perror("[network] accept call");
 151         return N_ERROR;
 152       }
 153       strncpy(net->connection[channel].ip,inet_ntoa(addr.sin_addr),IP_DIGITS);
 154       net->connection[channel].port=ntohs(addr.sin_port);
 155       net->connection[channel].status=C_IN_USE|C_INFO_A|C_SOCKET|C_ESTABL;
 156       printf("[network] established connection from %s port %d on channel %d\n",
 157              net->connection[channel].ip,net->connection[channel].port,channel);
 158       return channel;
 159     }
 160   }
 161
 162   puts("[network] maximum connections reached");
 163   return N_ERROR;
 164 }
 165
 166 int network_send(int fd,unsigned char *data,int datasize) {
 167
 168   int count,left;
 169
 170   count=0;
 171   left=datasize;
 172
 173   while(left) {
 174     if((count=write(fd,data+datasize-left,left))==-1) {
 175       perror("[network] write call");
 176       return N_ERROR;
 177     }
 178     left-=count;
 179   }
 180
 181   return N_SUCCESS;
 182 }
 183
 184 int network_receive(int fd,unsigned char *data,int datasize) {
 185
 186   int count;
 187
 188   if((count=read(fd,data,datasize))==-1) {
 189     perror("[network] read call");
 190     return N_ERROR;
 191   }
 192
 193   return count;
 194 }