/*
**************************************************************************
*
* Component: RDBG
* Module: servtsp.c
*
* Synopsis: Transport management for remote debug server.
*
* $Id$
*
**************************************************************************
*/
#include <sys/errno.h>
#include <rdbg/rdbg.h>
#include <rdbg/servrpc.h>
#include <signal.h>
#include <rpc/rpc.h>
#include <rpc/svc.h>
#include <netinet/in.h>
#include <sys/socket.h>
static int out_sock;
static int warm_test;
static void TimeTestHandler();
/*
* TspInit - Initialize the transport system.
*
*/
void
TspInit (int id)
{
struct sigaction sa;
/* setup a socket to send event messages back through */
out_sock = socket (PF_INET, SOCK_DGRAM, 0);
if (out_sock < 0) {
DPRINTF (("TspInit: socket() failed %d errno %d\n",
out_sock, getErrno()));
return; /* failed to open socket, let caller deal with */
}
{
struct sockaddr_in addr;
bzero ((void *)(&addr), sizeof addr);
addr.sin_family = AF_INET;
addr.sin_port = htons (BackPort);
if (bind (out_sock, (struct sockaddr*) &addr, sizeof addr) < 0) {
DPRINTF (("TspInit: bind() failed\n"));
}
}
/* setup alarm timer for warm testing */
memset (&sa, 0, sizeof (sa));
sa.sa_handler = TimeTestHandler;
sigaction (SIGALRM, &sa, 0);
}
/*
* TspTranslateRpcAddr - translate from an RPC handle to an
* opaque address.
*
* Converts the sender's address into the opaque data structure
* used for network addresses. This is used to look up the sender
* on each call.
*/
Boolean
TspTranslateRpcAddr (struct svc_req* rqstp, NET_OPAQUE* opaque)
{
struct sockaddr_in* addr; /* used as template to extract net info */
unsigned char* up;
memset (opaque, 0, sizeof (NET_OPAQUE));
/*
* We interpret the remote address as a standard netbuf name.
* The format is 2 bytes of address family (normally AF_INET)
* and then a length (5) and then the IP address.
*/
if (rqstp->rq_xprt->xp_addrlen != 16)
{
DPRINTF (("TspTranslateRpcAddr: Unknown remote address!!!\n"));
setErrno (EPROTONOSUPPORT);
return False; /* invalid, so fails */
}
/* addr = &rqstp->rq_xprt->xp_raddr; */
addr = svc_getcaller (rqstp->rq_xprt);
/* verify it is AF_INET */
if (addr->sin_family != AF_INET) { /* no, error */
DPRINTF (("TspTranslateRpcAddr: Not an internet address!!\n"));
setErrno (EAFNOSUPPORT);/* invalid addr family */
return False;
}
/* good address type */
up = (unsigned char *) &addr->sin_addr.s_addr;
DPRINTF (("TspTranslateRpcAddr: Sent by %u.%u.%u.%u port #%u\n",
up[0], up[1], up[2], up[3], htons (addr->sin_port)));
memcpy (opaque, addr, sizeof (struct sockaddr_in));
return True;
}
/*
* TspValidateAddr - validate a passed in opaque address.
*
* Checks that the passed in address is in the format
* expected.
*/
Boolean
TspValidateAddr (NET_OPAQUE* opaque, NET_OPAQUE* sender)
{
struct sockaddr_in* addr; /* used as template to extract net info */
addr = (struct sockaddr_in*) opaque;
/* Verify it is AF_INET. Should check against sender IP address too */
if (addr->sin_family != AF_INET) {
DPRINTF (("TspValidateAddr: Back port invalid: %d\n",
htons (addr->sin_port)));
return False; /* not valid */
}
/* otherwise, we copy in the IP address, since client may not know it */
addr->sin_addr.s_addr = ((struct sockaddr_in*) sender)->sin_addr.s_addr;
DPRINTF (("TspValidateAddr: Back port is %d\n", htons (addr->sin_port)));
return True;
}
/*
* TspConnGetIndex - lookup an rpc caller's address as a connection entry.
*
* Looks up an ip address of a caller to locate the
* connection index in our connection array.
*/
int
TspConnGetIndex (struct svc_req* rqstp)
{
int conn;
/* &rqstp->rq_xprt->xp_raddr; */
struct sockaddr_in *addr = svc_getcaller (rqstp->rq_xprt);
for (conn = 0; conn < conn_list_cnt; conn++) {
if (!conn_list[conn].in_use)
continue; /* not used */
if (addr->sin_addr.s_addr == ((struct sockaddr_in *)
&conn_list [conn].sender)->sin_addr.s_addr
&& addr->sin_port == ((struct sockaddr_in *)
&conn_list[conn].sender)->sin_port) {
return conn;
}
}
return -1;
}
/*
* TspSendWaitChange - send wait-change message to clients to
* notify change.
*/
void
TspSendWaitChange(
int conn, /* connection to send to */
BACK_MSG msg, /* BMSG type */
UINT16 spec, /* special information */
PID pid, /* pid it refers to */
UINT32 context, /* additional context for message */
Boolean force) /* force into being only message */
{
int idx;
struct SEND_LIST* snd_ptr;
if (force) {
/* force to top, which means others gone */
idx = 0;
conn_list [conn].send_idx = 1;
conn_list[conn].retry = 0;
} else {
for (idx = 0; idx < (int) conn_list[conn].send_idx; idx++) {
if (conn_list[conn].send_list[idx].send_type == msg
&& conn_list[conn].send_list[idx].pid == pid)
return; /* already pended for this pid */
}
idx = conn_list[conn].send_idx;
if (idx+1 > MAX_SEND)
return; /* we lose it, what should we do??? */
conn_list[conn].send_idx++;
}
snd_ptr = &conn_list[conn].send_list[idx];
snd_ptr->send_type = msg; /* message to send */
snd_ptr->retry = TSP_RETRIES; /* about 1 minute of retries */
snd_ptr->spec = htons ((u_short) spec);
snd_ptr->pid = htonl (pid);
snd_ptr->context = htonl (context);
TspSendMessage (conn, False); /* now do the send */
}
/*
* TspSendMessage - send message at top of send list for connection.
*/
void
TspSendMessage( int conn, Boolean resend)
{
struct sockaddr_in addr;
struct UDP_MSG msg;
int cnt;
if (!resend && conn_list[conn].retry)
return; /* already waiting for reply */
/*
* Note on above: if no back port we can't remove unless
* someone blows off.
*/
if (!resend) {
/* first time, setup. Set retry count: */
conn_list[conn].retry = conn_list[conn].send_list[0].retry;
conn_list[conn].last_msg_num++; /* new sequence number */
if (!warm_test++) { /* starting, so enable timer */
alarm (2); /* resend every 2 seconds as needed */
}
}
msg.type = conn_list[conn].send_list[0].send_type;
msg.msg_num = conn_list[conn].last_msg_num;
msg.spec = conn_list[conn].send_list[0].spec;
msg.pid = conn_list[conn].send_list[0].pid;
msg.context = conn_list[conn].send_list[0].context;
memset (&addr, 0, sizeof addr);
addr.sin_family = AF_INET;
addr.sin_port = ((struct sockaddr_in*)&conn_list[conn].back_port)->sin_port;
addr.sin_addr.s_addr =
((struct sockaddr_in*)&conn_list[conn].back_port)->sin_addr.s_addr;
DPRINTF (("TspSendMessage: Sending msg %d (%s) to port %d\n",
msg.type, BmsgNames [msg.type], HL_W (addr.sin_port)));
cnt = sendto (out_sock, &msg, sizeof msg, 0, (struct sockaddr*) &addr,
sizeof addr);
if (cnt != sizeof msg) { /* failed on send */
printf ("%s: Failed to send msg %d to conn %d (%d vs. %d)\n",
ActName, msg.type, conn, cnt, sizeof msg);
}
}
/*
* TspMessageReceive - confirmation received, now send next if any.
*
* - since UDP is connectionless, we batch up the sends and use
* one at a time until we get a message indicating ready for
* next (from ack).
*/
void
TspMessageReceive (int conn, PID pid)
{
/* We remove the send list entry and use next if any */
conn_list[conn].retry = 0; /* reset */
if (!warm_test || !--warm_test) {
alarm (0); /* reset timer if not used */
}
#ifdef DDEBUG
if (conn_list[conn].send_list[0].send_type == BMSG_WARM) {
DPRINTF (("TspMessageReceive: Connection reset for conn %d\n", conn));
}
#endif
/* Move up by one if needed */
if (!--conn_list[conn].send_idx)
return; /* no more to do */
memcpy (conn_list[conn].send_list, conn_list[conn].send_list+1,
conn_list[conn].send_idx * sizeof(struct SEND_LIST)); /* copy down */
TspSendMessage (conn, 0);
}
/*
* TspGetHostName - return client's host name.
*
* - this routine returns the name of the client's host or the net
* number of unknown.
*/
char*
TspGetHostName (conn_idx)
int conn_idx; /* client connection number */
{
static char buff [30]; /* largest net num */
unsigned char* cp;
cp = conn_list[conn_idx].sender.c+4;
sprintf (buff, "%u.%u.%u.%u", cp[0], cp[1], cp[2], cp[3]);
return buff;
}
/*
* TimeTestHandler - alarm timer handler to resend warm/wait test.
*/
static void
TimeTestHandler()
{
int conn;
if (!warm_test)
return; /* no longer enabled */
for (conn = 0; conn < conn_list_cnt; conn++) {
/* locate all that are using this */
if (!conn_list[conn].in_use)
continue; /* not used */
if (!conn_list[conn].retry) continue;
/* found one that we are testing */
if (!--conn_list[conn].retry) {
/*
* Counted down the retries: blow off.
* Need to have connection flag to indicate not blowing
* off for cases where client is stopped due to being
* debugged.
*/
ConnDelete (conn, NULL, CLOSE_IGNORE);
continue;
}
TspSendMessage (conn, True); /* send another message */
}
alarm (2); /* setup for 2 seconds from now */
}
