#include "network.h"
#include "tree234.h"
+#define ipv4_is_loopback(addr) \
+ ((ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L)
+
struct Socket_tag {
struct socket_function_table *fn;
/* the above variable absolutely *must* be the first in this structure */
struct SockAddr_tag {
char *error;
- /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
+ /*
+ * Which address family this address belongs to. AF_INET for
+ * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
+ * resolution has not been done and a simple host name is held
+ * in this SockAddr structure.
+ */
int family;
unsigned long address; /* Address IPv4 style. */
#ifdef IPV6
struct addrinfo *ai; /* Address IPv6 style. */
#endif
+ char hostname[512]; /* Store an unresolved host name. */
};
static tree234 *sktree;
return ret;
}
+SockAddr sk_nonamelookup(char *host)
+{
+ SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
+ ret->family = AF_UNSPEC;
+ strncpy(ret->hostname, host, lenof(ret->hostname));
+ ret->hostname[lenof(ret->hostname)-1] = '\0';
+ return ret;
+}
+
void sk_getaddr(SockAddr addr, char *buf, int buflen)
{
#ifdef IPV6
- if (addr->family == AF_INET) {
+ if (addr->family == AF_INET6) {
+ FIXME; /* I don't know how to get a text form of an IPv6 address. */
+ } else
#endif
+ if (addr->family == AF_INET) {
struct in_addr a;
a.s_addr = htonl(addr->address);
strncpy(buf, inet_ntoa(a), buflen);
-#ifdef IPV6
+ buf[buflen-1] = '\0';
} else {
- FIXME; /* I don't know how to get a text form of an IPv6 address. */
+ assert(addr->family == AF_UNSPEC);
+ strncpy(buf, addr->hostname, buflen);
+ buf[buflen-1] = '\0';
}
+}
+
+int sk_hostname_is_local(char *name)
+{
+ return !strcmp(name, "localhost");
+}
+
+int sk_address_is_local(SockAddr addr)
+{
+#ifdef IPV6
+ if (addr->family == AF_INET6) {
+ FIXME; /* someone who can compile for IPV6 had better do this bit */
+ } else
#endif
+ if (addr->family == AF_INET) {
+ struct in_addr a;
+ a.s_addr = htonl(addr->address);
+ return ipv4_is_loopback(a);
+ } else {
+ assert(addr->family == AF_UNSPEC);
+ return 0; /* we don't know; assume not */
+ }
}
int sk_addrtype(SockAddr addr)
{
- return addr->family;
+ return (addr->family == AF_INET ? ADDRTYPE_IPV4 :
+#ifdef IPV6
+ addr->family == AF_INET6 ? ADDRTYPE_IPV6 :
+#endif
+ ADDRTYPE_NAME);
}
void sk_addrcopy(SockAddr addr, char *buf)
{
+ assert(addr->family != AF_UNSPEC);
#ifdef IPV6
- if (addr->family == AF_INET) {
+ if (addr->family == AF_INET6) {
+ memcpy(buf, (char*) addr->ai, 16);
+ } else
#endif
+ if (addr->family == AF_INET) {
struct in_addr a;
a.s_addr = htonl(addr->address);
memcpy(buf, (char*) &a.s_addr, 4);
-#ifdef IPV6
- } else {
- memcpy(buf, (char*) addr->ai, 16);
}
-#endif
}
void sk_addr_free(SockAddr addr)
/*
* Open socket.
*/
+ assert(addr->family != AF_UNSPEC);
s = socket(addr->family, SOCK_STREAM, 0);
ret->s = s;
return (Socket) ret;
}
-Socket sk_newlistener(int port, Plug plug, int local_host_only)
+Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only)
{
static struct socket_function_table fn_table = {
sk_tcp_plug,
ret->oobinline = 0;
-
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
-
#ifdef IPV6
if (addr->family == AF_INET6) {
memset(&a6, 0, sizeof(a6));
a6.sin6_family = AF_INET6;
+ /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
+ * know how to do it. :-) */
if (local_host_only)
a6.sin6_addr = in6addr_loopback;
else
} else
#endif
{
+ int got_addr = 0;
a.sin_family = AF_INET;
- if (local_host_only)
- a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- else
- a.sin_addr.s_addr = htonl(INADDR_ANY);
+
+ /*
+ * Bind to source address. First try an explicitly
+ * specified one...
+ */
+ if (srcaddr) {
+ a.sin_addr.s_addr = inet_addr(srcaddr);
+ if (a.sin_addr.s_addr != INADDR_NONE) {
+ /* Override localhost_only with specified listen addr. */
+ ret->localhost_only = ipv4_is_loopback(a.sin_addr);
+ got_addr = 1;
+ }
+ }
+
+ /*
+ * ... and failing that, go with one of the standard ones.
+ */
+ if (!got_addr) {
+ if (local_host_only)
+ a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ else
+ a.sin_addr.s_addr = htonl(INADDR_ANY);
+ }
+
a.sin_port = htons((short)port);
}
#ifdef IPV6
u_long atmark;
/* wParam is the socket itself */
+
+ /*
+ * One user has reported an assertion failure in tree234 which
+ * indicates a null element pointer has been passed to a
+ * find*234 function. The following find234 is the only one in
+ * the whole program that I can see being capable of doing
+ * this, hence I'm forced to conclude that WinSock is capable
+ * of sending me netevent messages with wParam==0. I want to
+ * know what the rest of the message is if it does so!
+ */
+ if (wParam == 0) {
+ char *str;
+ str = dupprintf("Strange WinSock message: wp=%08x lp=%08x",
+ (int)wParam, (int)lParam);
+ logevent(NULL, str);
+ connection_fatal(NULL, str);
+ sfree(str);
+ }
+
s = find234(sktree, (void *) wParam, cmpforsearch);
if (!s)
return 1; /* boggle */
break;
}
- if (s->localhost_only &&
- ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) {
+ if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) {
closesocket(t); /* dodgy WinSock let nonlocal through */
} else if (plug_accepting(s->plug, (void*)t)) {
closesocket(t); /* denied or error */
Actual_Socket s = index234(sktree, (*state)++);
return s ? s->s : INVALID_SOCKET;
}
+
+int net_service_lookup(char *service)
+{
+ struct servent *se;
+ se = getservbyname(service, NULL);
+ if (se != NULL)
+ return ntohs(se->s_port);
+ else
+ return 0;
+}