1 #include <plan9.h>
2 #include <sys/socket.h> /* various networking crud */
3 #include <netinet/in.h>
4 #include <netinet/tcp.h>
5 #include <netdb.h>
6
7 void
getremotehostname(char * name,int nname)8 getremotehostname(char *name, int nname)
9 {
10 struct sockaddr_in sock;
11 struct hostent *hp;
12 uint len;
13 int on;
14
15 strecpy(name, name+nname, "unknown");
16 len = sizeof sock;
17 if(getpeername(0, (struct sockaddr*)&sock, (void*)&len) < 0)
18 return;
19
20 hp = gethostbyaddr((char *)&sock.sin_addr, sizeof (struct in_addr),
21 sock.sin_family);
22 if(hp == 0)
23 return;
24
25 strecpy(name, name+nname, hp->h_name);
26 on = 1;
27 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char*)&on, sizeof(on));
28 #ifdef TCP_NODELAY
29 on = 1;
30 setsockopt(0, IPPROTO_TCP, TCP_NODELAY, (char*)&on, sizeof(on));
31 #endif
32 }
33