void bpagealign(struct Block *blk)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
addzblock(blk, 4096 - (blk->used & 0xfff));
}
char *getstr(struct Block *blk, int off)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
assert((off >= 0) && (off < blk->used));
return (blk->mem)+off;
}
// send a text message
int cmdchat(char *args)
{
uint8_t cmdmode;
int status;
char *inbuf;
pid_t procid;
// remember to set the "silent" bit to tell the other end that we don't want output
cmdmode = CODECHAT;
if (args != NULL) {
if (silent) {
cmdmode = cmdmode | 0x80;
}
makeblock(cmdmode, (uint8_t *) args, strlen(args));
} else {
inbuf = malloc(INPUTBUFFERSIZE);
if (inbuf == NULL) {
perror("can't allocate memory");
exit(0);
}
procid = fork();
if (procid == 0) {
cmdreceive(NULL);
}
for (;;) {
printf("CHAT] ");
if (fgets(inbuf, INPUTBUFFERSIZE, stdin) > 0) {
if (!strncmp(inbuf, "quit", 4)) {
kill(procid, 9);
wait(&status);
return (0);
}
makeblock(cmdmode, (uint8_t *) inbuf,
strlen(inbuf));
} else {
return (0);
}
}
}
return (0);
}
int getint(struct Block *blk, int off)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
assert((off >= 0) && (off < blk->used));
assert(off%sizeof(int) == 0);
return *( (int *)((blk->mem)+off) );
}
void blkensure(struct Block *blk, int sz)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
if(blk->used + sz >= blk->size) {
blk->mem = chgmem(blk->mem, blk->used + sz + GROW);
blk->size = blk->used + sz + GROW;
}
}
int addzblock(struct Block *blk, int sz)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
blkensure(blk, sz);
memset(blk->mem + blk->used, 0, sz);
blk->used += sz;
return blk->used - sz;
}
int addint(struct Block *blk, int i)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
blkensure(blk, 4);
*(int *)(blk->mem + blk->used) = i;
blk->used += 4;
return blk->used - 4;
}
void placeint(struct Block *zb, int zint, int off)
{
assert(zb);
if(zb->mem == NULL)
makeblock(zb);
assert(zb->mem);
if(off%sizeof(int) != 0)
error("Address not int-aligned", off);
if((off > zb->used-4) || (off < 0))
fatal("Internal error: Offset outside area");
*(int *)(zb->mem + off) = zint;
}
int getdata(struct Block *blk, unsigned char *f, int off, int len)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
assert(off >= 0 && len >= 0);
blkensure(blk, len);
memcpy(blk->mem + blk->used, f + off, len);
blk->used += len;
return blk->used - len;
}
int addstr(struct Block *blk, char *str)
{
int len = strlen(str)+1;
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
blkensure(blk, len);
strcpy(blk->mem + blk->used, str);
blk->used += len;
return blk->used - len;
}
void alignarea(struct Block *a)
{
char zeros[4] = {'\0', '\0', '\0', '\0'};
int needed;
assert(a);
if(a->mem == NULL)
makeblock(a);
assert(a->mem);
needed = 4 - (a->used % 4);
if(needed == 4)
return;
addtoarea(a, zeros, needed);
}
int loaddata(struct Block *blk, FILE *f, int off, int len)
{
assert(blk);
if(blk->mem == NULL)
makeblock(blk);
assert(blk->mem);
assert(off >= 0);
blkensure(blk, len);
if(fseek(f, off, SEEK_SET))
fatal("Can't load data (corrupt QObj?)");
fread(blk->mem + blk->used, 1, len, f);
blk->used += len;
return blk->used - len;
}
int cmdtoken(char *args)
{
if (args == NULL) {
memset(nonce, 0x0, crypto_box_NONCEBYTES);
makeblock(CODETOKEN, (uint8_t *) "AAAAAAAA", 8);
receivedata(CMDTOKEN);
} else if (!strncmp(args, "static", 6)) {
printf("nonce is now static\n");
staticnonce = 1;
} else if (!strncmp(args, "dynamic", 7)) {
printf("nonce is now dynamic\n");
staticnonce = 0;
}
return (0);
}
int addtoarea(struct Block *zarea, void *data, int sz)
{
int ns;
assert(zarea);
if(zarea->mem == NULL)
makeblock(zarea);
assert(zarea->mem);
if(zarea->used + sz >= zarea->size) {
ns = zarea->used + sz + GROW;
zarea->mem = chgmem(zarea->mem, ns);
zarea->size = ns;
}
memcpy(zarea->mem + zarea->used, data, sz);
zarea->used += sz;
return zarea->used - sz;
}
// supply the remote host with a command for execution
int cmdexec(char *args)
{
uint8_t cmdmode;
// if we don't get any commands to execute, return
if (args == NULL) {
return (1);
}
// remember to set the "silent" bit to tell the other end that we don't want output
cmdmode = CODEEXEC;
if (silent) {
cmdmode = cmdmode | 0x80;
}
makeblock(cmdmode, (uint8_t *) args, strlen(args));
//if we aren't in silent mode listen for output
if (!silent) {
receivedata(CMDEXEC);
}
updatenonce();
return (0);
}
/*
* 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;
}
}
}
