static void xsync_handle(struct xsync_ctx_t * ctx)
{
uint8_t buf[PACKET_DATA_MAX];
size_t size;
switch(ctx->packet.command)
{
case XSYNC_COMMAND_ALIVE:
size = sprintf((char *)buf, "%s", machine_uniqueid());
xsync_put(XSYNC_COMMAND_ALIVE, buf, size);
break;
case XSYNC_COMMAND_START:
buf[0] = xsync_handle_start(ctx);
xsync_put(XSYNC_COMMAND_START, buf, 1);
break;
case XSYNC_COMMAND_TRANSFER:
vfs_write(ctx->fd, (void *)ctx->packet.data, packet_dsize(&ctx->packet));
xsync_put(XSYNC_COMMAND_TRANSFER, 0, 0);
break;
case XSYNC_COMMAND_STOP:
if(ctx->fd > 0)
{
vfs_close(ctx->fd);
ctx->fd = -1;
}
xsync_put(XSYNC_COMMAND_STOP, 0, 0);
break;
case XSYNC_COMMAND_SYSTEM:
xsync_put(XSYNC_COMMAND_SYSTEM, 0, 0);
ctx->quit = 1;
if(ctx->fd > 0)
{
vfs_close(ctx->fd);
ctx->fd = -1;
}
memset(buf, 0, sizeof(buf));
memcpy(buf, &ctx->packet.data[0], packet_dsize(&ctx->packet));
shell_system((const char *)buf);
break;
default:
xsync_put(XSYNC_COMMAND_UNKOWN, 0, 0);
break;
}
}
int
main(int argc, char *argv[])
{
size_t clen, l;
int ch, debug, i, magic, n, nargs, rval;
char *c, *cmd, *p, *q, *nc;
(void)setprogname(argv[0]); /* for portability */
debug = 0;
magic = '%'; /* Default magic char is `%'. */
nargs = -1;
while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) {
switch (ch) {
case 'a':
if (optarg[1] != '\0')
errx(EXIT_FAILURE,
"illegal magic character specification.");
magic = optarg[0];
break;
case 'd':
debug = 1;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (nargs != -1)
errx(EXIT_FAILURE,
"only one -# argument may be specified.");
nargs = optopt - '0';
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
/*
* The command to run is argv[0], and the args are argv[1..].
* Look for %digit references in the command, remembering the
* largest one.
*/
for (n = 0, p = argv[0]; *p != '\0'; ++p) {
if (p[0] == magic && isdigit((unsigned char)p[1]) &&
p[1] != '0') {
++p;
if (p[0] - '0' > n)
n = p[0] - '0';
}
}
/*
* If there were any %digit references, then use those, otherwise
* build a new command string with sufficient %digit references at
* the end to consume (nargs) arguments each time round the loop.
* Allocate enough space to hold the maximum command.
*/
if ((cmd = malloc(sizeof("exec ") - 1 +
strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL)
err(EXIT_FAILURE, "malloc");
if (n == 0) {
/* If nargs not set, default to a single argument. */
if (nargs == -1)
nargs = 1;
p = cmd;
p += sprintf(cmd, "exec %s", argv[0]);
for (i = 1; i <= nargs; i++)
p += sprintf(p, " %c%d", magic, i);
/*
* If nargs set to the special value 0, eat a single
* argument for each command execution.
*/
if (nargs == 0)
nargs = 1;
} else {
(void)sprintf(cmd, "exec %s", argv[0]);
nargs = n;
}
/*
* Grab some space in which to build the command. Allocate
* as necessary later, but no reason to build it up slowly
* for the normal case.
*/
if ((c = malloc(clen = 1024)) == NULL)
err(EXIT_FAILURE, "malloc");
/*
* (argc) and (argv) are still offset by one to make it simpler to
* expand %digit references. At the end of the loop check for (argc)
* equals 1 means that all the (argv) has been consumed.
*/
for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
/*
* Find a max value for the command length, and ensure
* there's enough space to build it.
*/
for (l = strlen(cmd), i = 0; i < nargs; i++)
l += strlen(argv[i+1]);
if (l > clen) {
nc = realloc(c, l);
if (nc == NULL)
err(EXIT_FAILURE, "malloc");
c = nc;
clen = l;
}
/* Expand command argv references. */
for (p = cmd, q = c; *p != '\0'; ++p) {
if (p[0] == magic && isdigit((unsigned char)p[1]) &&
p[1] != '0')
q += sprintf(q, "%s", argv[(++p)[0] - '0']);
else
*q++ = *p;
}
/* Terminate the command string. */
*q = '\0';
/* Run the command. */
if (debug)
(void)printf("%s\n", c);
else if (shell_system(c))
rval = 1;
}
if (argc != 1)
errx(EXIT_FAILURE,
"expecting additional argument%s after \"%s\"",
(nargs - argc) ? "s" : "", argv[argc - 1]);
return rval;
}
