-/* $Cambridge: exim/src/src/ip.c,v 1.3 2005/06/27 14:29:43 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2005 */
+/* Copyright (c) University of Cambridge 1995 - 2009 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for doing things with sockets. With the advent of IPv6 this has
*************************************************/
/* This function connects a socket to a remote address and port. The socket may
-or may not have previously been bound to a local interface.
+or may not have previously been bound to a local interface. The socket is not
+closed, even in cases of error. It is expected that the calling function, which
+created the socket, will be the one that closes it.
Arguments:
sock the socket
/* There is a testing facility for simulating a connection timeout, as I
can't think of any other way of doing this. It converts a connection refused
-into a timeout.
-
-I had to add a second fudge to keep the tests working. Attempts to connect to
-10.x.x.x are expected to timeout, but sometimes they now give "No route to
-host". */
+into a timeout if the timeout is set to 999999. */
if (running_in_test_harness)
{
- if ((save_errno == ECONNREFUSED && timeout == 999999) ||
- (save_errno == EHOSTUNREACH && timeout > 0 &&
- Ustrncmp(address, "10.", 3) == 0))
+ if (save_errno == ECONNREFUSED && timeout == 999999)
{
rc = -1;
save_errno = EINTR;
/* A failure whose error code is "Interrupted system call" is in fact
an externally applied timeout if the signal handler has been run. */
-(void)close(sock);
errno = (save_errno == EINTR && sigalrm_seen)? ETIMEDOUT : save_errno;
return -1;
}
}
+
+
+/*************************************************
+* Lookup DSCP settings for a socket *
+*************************************************/
+
+struct dscp_name_tableentry {
+ const uschar *name;
+ int value;
+};
+/* Keep both of these tables sorted! */
+static struct dscp_name_tableentry dscp_table[] = {
+#ifdef IPTOS_DSCP_AF11
+ { "af11", IPTOS_DSCP_AF11 },
+ { "af12", IPTOS_DSCP_AF12 },
+ { "af13", IPTOS_DSCP_AF13 },
+ { "af21", IPTOS_DSCP_AF21 },
+ { "af22", IPTOS_DSCP_AF22 },
+ { "af23", IPTOS_DSCP_AF23 },
+ { "af31", IPTOS_DSCP_AF31 },
+ { "af32", IPTOS_DSCP_AF32 },
+ { "af33", IPTOS_DSCP_AF33 },
+ { "af41", IPTOS_DSCP_AF41 },
+ { "af42", IPTOS_DSCP_AF42 },
+ { "af43", IPTOS_DSCP_AF43 },
+ { "ef", IPTOS_DSCP_EF },
+#endif
+#ifdef IPTOS_LOWCOST
+ { "lowcost", IPTOS_LOWCOST },
+#endif
+ { "lowdelay", IPTOS_LOWDELAY },
+#ifdef IPTOS_MINCOST
+ { "mincost", IPTOS_MINCOST },
+#endif
+ { "reliability", IPTOS_RELIABILITY },
+ { "throughput", IPTOS_THROUGHPUT }
+};
+static int dscp_table_size =
+ sizeof(dscp_table) / sizeof(struct dscp_name_tableentry);
+
+/* DSCP values change by protocol family, and so do the options used for
+setsockopt(); this utility does all the lookups.
+
+Arguments:
+ dscp_name a string, so far unvalidated
+ af address_family in use
+ level setsockopt level to use
+ optname setsockopt name to use
+ dscp_value value for dscp_name
+
+Returns: TRUE if okay to setsockopt(), else FALSE
+*/
+
+BOOL
+dscp_lookup(const uschar *dscp_name, int af,
+ int *level, int *optname, int *dscp_value)
+{
+uschar *dscp_lookup;
+int first, last;
+
+if (af == AF_INET)
+ {
+ *level = IPPROTO_IP;
+ *optname = IP_TOS;
+ }
+else if (af == AF_INET6)
+ {
+ *level = IPPROTO_IPV6;
+ *optname = IPV6_TCLASS;
+ }
+else
+ {
+ DEBUG(D_transport)
+ debug_printf("Unhandled address family %d in dscp_lookup()\n", af);
+ return FALSE;
+ }
+if (!dscp_name)
+ {
+ DEBUG(D_transport)
+ debug_printf("[empty DSCP]\n");
+ return FALSE;
+ }
+dscp_lookup = expand_string(US dscp_name);
+if (dscp_lookup == NULL || *dscp_lookup == '\0')
+ return FALSE;
+
+first = 0;
+last = dscp_table_size;
+while (last > first)
+ {
+ int middle = (first + last)/2;
+ int c = Ustrcmp(dscp_lookup, dscp_table[middle].name);
+ if (c == 0)
+ {
+ *dscp_value = dscp_table[middle].value;
+ return TRUE;
+ }
+ else if (c > 0)
+ {
+ first = middle + 1;
+ }
+ else
+ {
+ last = middle;
+ }
+ }
+return FALSE;
+}
+
+
/* End of ip.c */