//SNP process uses this function to receive a sendseg_arg_t structure which contains a segment and its destination node ID from the SRT process.
//Parameter tran_conn is the TCP descriptor of the connection between the SRT process and the SNP process.
//Return 1 if a sendseg_arg_t is succefully received, otherwise return -1.
int getsegToSend(int tran_conn, int* dest_nodeID, seg_t* segPtr)
{
sendseg_arg_t a;
if (-1 == recvf(&a, tran_conn)) {
return -1;
}
*dest_nodeID = a.nodeID;
memcpy(segPtr, &a.seg, sizeof(seg_t));
return 1;
}
//SRT process uses this function to receive a sendseg_arg_t structure which contains a segment and its src node ID from the SNP process.
//Parameter network_conn is the TCP descriptor of the connection between the SRT process and the SNP process.
//When a segment is received, use seglost to determine if the segment should be discarded, also check the checksum.
//Return 1 if a sendseg_arg_t is succefully received, otherwise return -1.
int snp_recvseg(int network_conn, int* src_nodeID, seg_t* segPtr)
{
sendseg_arg_t a;
if (-1 == recvf(&a, network_conn)) {
return -1;
}
*src_nodeID = a.nodeID;
memcpy(segPtr, &a.seg, sizeof(seg_t));
return 1;
}
/*
* Server routine to read requests and process them.
* Commands are:
* Tname - Transmit file if out of date
* Vname - Verify if file out of date or not
* Qname - Query if file exists. Return mtime & size if it does.
*/
void
server()
{
char cmdbuf[BUFSIZ];
register char *cp;
signal(SIGHUP, cleanup);
signal(SIGINT, cleanup);
signal(SIGQUIT, cleanup);
signal(SIGTERM, cleanup);
signal(SIGPIPE, cleanup);
rem = 0;
oumask = umask(0);
(void) sprintf(buf, "V%d\n", VERSION);
(void) write(rem, buf, strlen(buf));
for (;;) {
cp = cmdbuf;
if (read(rem, cp, 1) <= 0)
return;
if (*cp++ == '\n') {
error("server: expected control record\n");
continue;
}
do {
if (read(rem, cp, 1) != 1)
cleanup(0);
} while (*cp++ != '\n' && cp < &cmdbuf[BUFSIZ]);
*--cp = '\0';
cp = cmdbuf;
switch (*cp++) {
case 'T': /* init target file/directory name */
catname = 1; /* target should be directory */
goto dotarget;
case 't': /* init target file/directory name */
catname = 0;
dotarget:
if (exptilde(target, cp) == NULL)
continue;
tp = target;
while (*tp)
tp++;
ack();
continue;
case 'R': /* Transfer a regular file. */
recvf(cp, S_IFREG);
continue;
case 'D': /* Transfer a directory. */
recvf(cp, S_IFDIR);
continue;
case 'K': /* Transfer symbolic link. */
recvf(cp, S_IFLNK);
continue;
case 'k': /* Transfer hard link. */
hardlink(cp);
continue;
case 'E': /* End. (of directory) */
*tp = '\0';
if (catname <= 0) {
error("server: too many 'E's\n");
continue;
}
tp = stp[--catname];
*tp = '\0';
ack();
continue;
case 'C': /* Clean. Cleanup a directory */
clean(cp);
continue;
case 'Q': /* Query. Does the file/directory exist? */
query(cp);
continue;
case 'S': /* Special. Execute commands */
dospecial(cp);
continue;
#ifdef notdef
/*
* These entries are reserved but not currently used.
* The intent is to allow remote hosts to have master copies.
* Currently, only the host rdist runs on can have masters.
*/
case 'X': /* start a new list of files to exclude */
except = bp = NULL;
case 'x': /* add name to list of files to exclude */
if (*cp == '\0') {
ack();
continue;
}
if (*cp == '~') {
if (exptilde(buf, cp) == NULL)
continue;
cp = buf;
}
if (bp == NULL)
except = bp = expand(makeblock(NAME, cp), E_VARS);
else
bp->b_next = expand(makeblock(NAME, cp), E_VARS);
while (bp->b_next != NULL)
bp = bp->b_next;
ack();
continue;
case 'I': /* Install. Transfer file if out of date. */
opts = 0;
while (*cp >= '0' && *cp <= '7')
opts = (opts << 3) | (*cp++ - '0');
if (*cp++ != ' ') {
error("server: options not delimited\n");
return;
}
install(cp, opts);
continue;
case 'L': /* Log. save message in log file */
log(lfp, cp);
continue;
#endif
case '\1':
nerrs++;
continue;
case '\2':
return;
default:
error("server: unknown command '%s'\n", cp);
case '\0':
continue;
}
}
}