1 /* network.c -- network management stuff
3 * author: hackbard@hackdaworld.dyndns.org
9 int network_init(t_net *net) {
11 struct sockaddr_in addr;
14 puts("[network] initializing network ...");
16 memset(net->connection,0,MAX_CONNECTIONS*sizeof(t_connection));
20 if((net->l_fd=socket(AF_INET,SOCK_STREAM,0))==-1) {
21 perror("[network] socket call");
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;
30 /* prevent addres in use error message */
32 if(setsockopt(net->l_fd,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(true))==-1) {
33 perror("[network] setsockopt call");
37 if(bind(net->l_fd,(struct sockaddr *)&addr,
38 sizeof(struct sockaddr))==-1) {
39 perror("[network] bind call");
43 if(listen(net->l_fd,MAX_LISTEN_QUEUE)==-1) {
44 perror("[network] listen call");
48 printf("[network] listen on %s port %d\n",inet_ntoa(addr.sin_addr),
54 int network_shutdown(t_net *net) {
56 if(close(net->l_fd)==-1) {
57 perror("[network] close call");
61 puts("[network] shutdown");
66 int network_set_listen_port(t_net *net,in_port_t port) {
73 int network_manage_connection(t_net *net) {
76 struct sockaddr_in addr;
78 for(i=0;i<MAX_CONNECTIONS;i++) {
80 if(net->connection[i].status&C_IN_USE) {
82 if(net->connection[i].status&C_HANGUP) {
83 if(close(net->connection[i].fd)==-1) {
84 perror("[network] close call");
87 printf("[network] connection %d closed\n",i);
88 net->connection[i].status=0;
91 if(net->connection[i].status&C_INFO_A) {
93 if(!net->connection[i].status&C_SOCKET) {
94 if((net->connection[i].fd=socket(AF_INET,SOCK_STREAM,0))==-1) {
95 perror("[network] socket call");
100 if(!net->connection[i].status&C_ESTABL) {
102 memset(&addr,0,sizeof(struct sockaddr));
103 addr.sin_family=AF_INET;
104 addr.sin_port=htons(net->connection[i].port);
105 if(!inet_aton(net->connection[i].ip,&(addr.sin_addr))) {
106 perror("[network] inet_aton call");
110 if(connect(net->connection[i].fd,(struct sockaddr *)&addr,
111 sizeof(struct sockaddr))==-1) {
112 perror("[network] connect call");
116 printf("[network] established connection to %s port %d on channel %d\n",
117 net->connection[i].ip,net->connection[i].port,i);
130 int network_manage_incoming(t_net *net) {
133 struct sockaddr_in addr;
136 for(channel=0;channel<MAX_CONNECTIONS;channel++) {
137 if(!net->connection[channel].status&C_IN_USE) {
138 if((net->connection[channel].fd=accept(net->l_fd,
139 (struct sockaddr *)&addr,
141 perror("[network] accept call");
144 strncpy(net->connection[channel].ip,inet_ntoa(addr.sin_addr),IP_DIGITS);
145 net->connection[channel].port=ntohs(addr.sin_port);
146 net->connection[channel].status=C_IN_USE|C_INFO_A|C_SOCKET|C_ESTABL;
147 printf("[network] established connection from %s port %d on channel %d\n",
148 net->connection[channel].ip,net->connection[channel].port,channel);
153 puts("[network] maximum connections reached");
157 int network_send(int fd,unsigned char *data,int datasize) {
165 if((count=write(fd,data+datasize-left,left))==-1) {
166 perror("[network] write call");
175 int network_receive(int fd,unsigned char *data,int datasize) {
179 if((count=read(fd,data,datasize))==-1) {
180 perror("[network] read call");
187 int send_info(int channel,t_net *net,char *name) {
189 char data[SEND_N_MAX];
196 strncpy(data+2,name,size);
199 data[size]=SEND_N_G_CAP;
200 data[size+1]=sizeof(unsigned char);
201 data[size+1+sizeof(unsigned char)]=net->cap;
202 size+=(sizeof(unsigned char)+2);
204 data[size]=SEND_N_AV_CAP;
205 data[size+1]=sizeof(unsigned short);
206 data[size+1+sizeof(unsigned short)]=net->avcap;
207 size+=(sizeof(unsigned short)+2);
209 if(network_send(net->connection[channel].fd,data,size)==N_ERROR) {
210 puts("[network] send_info failed");
217 int receive_info(int channel,t_net *net) {
219 char data[CHAR_N_UNAME+2];
224 if((length=network_receive(net->connection[channel].fd,
225 data,SEND_N_MAX))==N_ERROR) {
226 puts("[network] receive_info failed");
230 while(length-count) {
231 switch(data[count]) {
233 strncpy(net->connection[channel].name,&data[count+2],data[count+1]);
234 net->connection[channel].name[(int)data[count+2]]='\0';
235 count+=(data[count+2]+2);
238 net->connection[channel].cap=data[count+4];
239 count+=(sizeof(unsigned char)+2);
242 net->connection[channel].avcap=data[count+3]<<8;
243 net->connection[channel].avcap|=data[count+4];
244 count+=(sizeof(unsigned short)+2);
247 puts("[network] receive_info, unknown character");